two-phase slice 10: ResultComp suffixes + unbounded sequences

F()[i]/.f/^ now wrap the call in an NkDesignator with NkSelector
children; Fact builds the NkCall into a local astRes passed to
ResultComp.  Also fixes a real cap: NkBlock/NkDeclSeq had MaxChild
children, silently dropping statements beyond 7 per block.  A new
AstAppend helper chains overflow through child[MaxChild-1] so sequences
are unbounded.  Nodes are inert.

Deferred: imports/CLASS/nested modules, Lower.

Gates: suite 178/178; fixpoint OK (stage2 == stage3, 3027925 bytes).

See docs/summary_two-phase-slice10.md.

compiler/src/M2.atg

@@ -164,6 +164,25 @@ PROCEDURE AstCallNode (callee: AST.Node) : AST.Node;
     RETURN n
   END AstCallNode;
 
+PROCEDURE AstAppend (kind: INTEGER; VAR head, tail: AST.Node;
+                     item: AST.Node);
+(* Appends `item` to a chunked sequence: each node holds up to
+   AST.MaxChild-1 items; child[MaxChild-1] continues into the next
+   chunk.  Unbounded, so blocks/decl sequences are not capped at 8. *)
+  VAR n: AST.Node;
+  BEGIN
+    IF item = AST.NoNode THEN RETURN END;
+    IF head = AST.NoNode THEN
+      head := AST.MakeNode(kind); tail := head
+    END;
+    IF AST.NChild(tail) >= AST.MaxChild - 1 THEN
+      n := AST.MakeNode(kind);
+      AST.SetChild(tail, AST.MaxChild - 1, n);
+      tail := n
+    END;
+    AST.SetChild(tail, AST.NChild(tail), item)
+  END AstAppend;
+
 CHARACTERS
   eol      = CHR(13) .
   lf       = CHR(10) .
@@ -322,14 +341,14 @@ PRODUCTIONS
                                            astUnit := astNode;
                                            QbeGen.EndModule(m1);
                                            SymTab.EndUnit; .) .
-  DeclSeq                               (. VAR astSeq: AST.Node; .)
-    =                                   (. astSeq := AST.MakeNode(AST.NkDeclSeq); .)
+  DeclSeq                               (. VAR astSeq, astTail: AST.Node; .)
+    =                                   (. astSeq := AST.NoNode;
+                                           astTail := AST.NoNode; .)
       { (. astDecl := AST.NoNode; .)
         ( ConstBlock | TypeBlock<FALSE> | VarBlock | ProcDecl ";"
         | NestedModule ";" | ClassItem ";" )
-                                        (. IF astDecl # AST.NoNode THEN
-                                             AST.SetChild(astSeq,
-                                               AST.NChild(astSeq), astDecl) END; .) }
+                                        (. AstAppend(AST.NkDeclSeq,
+                                             astSeq, astTail, astDecl); .) }
                                         (. astDecl := astSeq; .) .
   (* Local module, Wirth form. Declarations lower like top-level ones
      (same QBE module prefix); a BEGIN body becomes an init function
@@ -844,12 +863,11 @@ PRODUCTIONS
                                            methRes := SymTab.CurRes();
                                            SymTab.CloseProc;
                                            QbeGen.EndFunc(methRes); .) ) .
-  ConstBlock                            (. VAR astSeq: AST.Node; .)
-    = "CONST"                           (. astSeq := AST.MakeNode(AST.NkDeclSeq);
-                                           astDecl := AST.NoNode; .)
-      { ConstDecl ";"                   (. IF astDecl # AST.NoNode THEN
-                                             AST.SetChild(astSeq,
-                                               AST.NChild(astSeq), astDecl) END; .) }
+  ConstBlock                            (. VAR astSeq, astTail: AST.Node; .)
+    = "CONST"                           (. astSeq := AST.NoNode;
+                                           astTail := AST.NoNode; .)
+      { ConstDecl ";"                   (. AstAppend(AST.NkDeclSeq,
+                                             astSeq, astTail, astDecl); .) }
                                         (. astDecl := astSeq; .) .
   ConstDecl                             (. VAR n: SymTab.Name;
                                              t: SymTab.TypeIndex;
@@ -884,12 +902,11 @@ PRODUCTIONS
                                              SymTab.SetSymVal(n, qv);
                                              QbeGen.DeclConst(n, qv, t)
                                            END; .) .
-  VarBlock                              (. VAR astSeq: AST.Node; .)
-    = "VAR"                             (. astSeq := AST.MakeNode(AST.NkDeclSeq);
-                                           astDecl := AST.NoNode; .)
-      { VarDecl ";"                     (. IF astDecl # AST.NoNode THEN
-                                             AST.SetChild(astSeq,
-                                               AST.NChild(astSeq), astDecl) END; .) }
+  VarBlock                              (. VAR astSeq, astTail: AST.Node; .)
+    = "VAR"                             (. astSeq := AST.NoNode;
+                                           astTail := AST.NoNode; .)
+      { VarDecl ";"                     (. AstAppend(AST.NkDeclSeq,
+                                             astSeq, astTail, astDecl); .) }
                                         (. astDecl := astSeq; .) .
   VarDecl                               (. VAR nm: SymTab.Name;
                                              t: SymTab.TypeIndex;
@@ -1086,14 +1103,13 @@ PRODUCTIONS
       "END"
       GetIdent<m2>                      (. IF NOT SymTab.Equal(pn, m2) THEN
                                              SemError(202) END; .) .
-  StatSeq                               (. VAR astSeq: AST.Node; .)
-    =                                   (. astSeq := AST.MakeNode(AST.NkBlock); .)
-      Statement                         (. IF astStmt # AST.NoNode THEN
-                                             AST.SetChild(astSeq,
-                                               AST.NChild(astSeq), astStmt) END; .)
-      { ";" [ Statement                 (. IF astStmt # AST.NoNode THEN
-                                             AST.SetChild(astSeq,
-                                               AST.NChild(astSeq), astStmt) END; .) ] }
+  StatSeq                               (. VAR astSeq, astTail: AST.Node; .)
+    =                                   (. astSeq := AST.NoNode;
+                                           astTail := AST.NoNode; .)
+      Statement                         (. AstAppend(AST.NkBlock,
+                                             astSeq, astTail, astStmt); .)
+      { ";" [ Statement                 (. AstAppend(AST.NkBlock,
+                                             astSeq, astTail, astStmt); .) ] }
                                         (. astStmt := astSeq; .) .
   (* Trailing/empty statements (`a; ; b`, Coco/R's generated `;;`)
      are accepted: the statement after ';' is optional. *)
@@ -2386,14 +2402,23 @@ PRODUCTIONS
      (a value, or a descriptor address for aggregates); each component
      descends one level exactly like the Design components. *)
   ResultComp<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
-             VAR sfx: BOOLEAN>          (. VAR it, eT, bt: SymTab.TypeIndex;
+             VAR sfx: BOOLEAN; VAR node: AST.Node>          (. VAR it, eT, bt: SymTab.TypeIndex;
                                              iq, ql, qlo, qhi, qe, qb:
                                                QbeGen.QVal;
                                              lo, hi, fo: INTEGER;
                                              isOpen: BOOLEAN;
-                                             fname: SymTab.Name; .)
+                                             fname: SymTab.Name;
+                                             astWrap, astSel: AST.Node; .)
     = "[" Expr<it, iq>
-                                        (. IF t = SymTab.InvalidType THEN
+                                        (. IF AST.Kind(node) # AST.NkDesignator THEN
+                                             astWrap := AST.MakeNode(
+                                               AST.NkDesignator);
+                                             AST.SetChild(astWrap, 0, node);
+                                             node := astWrap
+                                           END;
+                                           AST.SetChild(node, AST.NChild(node),
+                                             AST.MakeUn(AST.NkSelector,
+                                               AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
                                            ELSIF SymTab.ClassOf(t) #
                                                  SymTab.ClArray THEN
                                              SemError(217);
@@ -2438,7 +2463,17 @@ PRODUCTIONS
                                            END; .)
       "]"
     | "." GetIdent<fname>
-                                        (. IF t = SymTab.InvalidType THEN
+                                        (. IF AST.Kind(node) # AST.NkDesignator THEN
+                                             astWrap := AST.MakeNode(
+                                               AST.NkDesignator);
+                                             AST.SetChild(astWrap, 0, node);
+                                             node := astWrap
+                                           END;
+                                           AST.SetChild(node, AST.NChild(node),
+                                             AST.MakeUn(AST.NkSelector,
+                                               AST.SelField,
+                                               AST.MakeLeaf(AST.NkIdent,
+                                                 fname))); IF t = SymTab.InvalidType THEN
                                            ELSIF (SymTab.ClassOf(t) #
                                                   SymTab.ClRecord)
   AND (SymTab.ClassOf(t) # SymTab.ClClass) THEN
@@ -2456,7 +2491,16 @@ PRODUCTIONS
                                              QbeGen.CopyOp(qe, q);
                                              sfx := TRUE
                                            END; .)
-    | "^"                               (. IF t = SymTab.InvalidType THEN
+    | "^"                               (. IF AST.Kind(node) # AST.NkDesignator THEN
+                                             astWrap := AST.MakeNode(
+                                               AST.NkDesignator);
+                                             AST.SetChild(astWrap, 0, node);
+                                             node := astWrap
+                                           END;
+                                           astSel := AST.MakeNode(AST.NkSelector);
+                                           AST.SetOp(astSel, AST.SelDeref);
+                                           AST.SetChild(node,
+                                             AST.NChild(node), astSel); IF t = SymTab.InvalidType THEN
                                            ELSIF SymTab.ClassOf(t) #
                                                  SymTab.ClPtr THEN
                                              SemError(219);
@@ -2874,7 +2918,8 @@ PRODUCTIONS
                                               astNode, astNot: AST.Node;
                                               j: CARDINAL;
                                               astArg2: AST.Node;
-                                              astBrace: AST.Node; .)
+                                              astBrace: AST.Node;
+                                              astRes: AST.Node; .)
     = (. astIsLit := FALSE; .)
     ( integer                           (. LexString(s);
                                            QbeGen.NormInt(s, q); IF twoPhase THEN astIsLit := TRUE; astCur := AST.MakeLeaf(AST.NkIntLit, s) END;
@@ -2974,10 +3019,13 @@ PRODUCTIONS
       [ TypedBraceLit<dt, q>            (. t := dt; astCall := TRUE;
                                              astBrace := astCur; .) ]
       [ ArgList<qn, dt, qd, TRUE, FALSE, methCls, ct2, q2, called>
-                                        (. astCall := TRUE; t := ct2;
+                                        (. astCall := TRUE;
+                                           astNode := AstCallNode(astD);
+                                           astRes := astNode;
+                                           t := ct2;
                                            QbeGen.CopyOp(q2, q);
                                            sfx := FALSE; .)
-        { ResultComp<t, q, sfx> }
+        { ResultComp<t, q, sfx, astRes> }
                                         (. IF sfx THEN
                                              IF t = SymTab.InvalidType THEN
                                                QbeGen.CopyOp("0", q)
@@ -2991,17 +3039,7 @@ PRODUCTIONS
                                              END
                                            END; .) ]
                                         (. IF called THEN
-                                             astNode := AST.MakeNode(AST.NkCall);
-                                             AST.SetChild(astNode, 0, astD);
-                                             j := 0;
-                                             WHILE (j < astNArgs)
-                                               AND (AST.NChild(astNode) <
-                                                    AST.MaxChild) DO
-                                               AST.SetChild(astNode,
-                                                 AST.NChild(astNode), astArgs[j]);
-                                               INC(j)
-                                             END;
-                                             astCur := astNode
+                                             astCur := astRes
                                            ELSIF astCall THEN
                                              astCur := astBrace
                                            ELSE astCur := astD

compiler/src/M2.lst

@@ -182,3469 +182,3507 @@ Listing:
   164      RETURN n
   165    END AstCallNode;
   166  
-  167  CHARACTERS
-  168    eol      = CHR(13) .
-  169    lf       = CHR(10) .
-  170    letter   = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" .
-  171    digit    = "0123456789" .
-  172    hexDigit = digit + "ABCDEFabcdef" .
-  173    noQuote1 = ANY - "'" - eol .
-  174    noQuote2 = ANY - '"' - eol .
-  175  
-  176  IGNORE CHR(9) .. CHR(13)
-  177  
-  178  COMMENTS FROM "(*" TO "*)" NESTED
-  179  COMMENTS FROM "//" TO lf
-  180  
-  181  TOKENS
-  182    ident   = letter { letter | digit } .
-  183    integer = digit { digit }
-  184            | digit { digit } CONTEXT("..")
-  185            | "0x" hexDigit { hexDigit }
-  186            | "0X" hexDigit { hexDigit } .
-  187    real    = digit { digit } "." { digit }
-  188              [ ( "E" | "e" ) [ "+" | "-" ] digit { digit } ] .
-  189    string  = "'" { noQuote1 } "'"
-  190            | '"' { noQuote2 } '"' .
-  191    charConst = digit { digit } ( "C" | "c" ) .
-  192    ustring = ( "U" | "u" ) ( "'" { noQuote1 } "'" | '"' { noQuote2 } '"' ) .
-  193  
-  194  PRODUCTIONS
-  195    M2
-  196      = (. AST.Init; twoPhase := TRUE; astCur := AST.NoNode; astStmt := AST.NoNode; astDecl := AST.NoNode; .)
-  197        Unit "." .
-  198    (* Units: program modules compile fully; DEFINITION and
-  199       IMPLEMENTATION modules parse + check now but lower in step 4
-  200       (each ends with one 230); same for nested local modules. *)
-  201    Unit
-  202      = DefUnit
-  203      | ImplUnit
-  204      | ProgModule .
-  205    (* Step 4.3: one session compiles DEFINITION, its IMPLEMENTATION
-  206       and one program (last) into one image. Units share the symbol
-  207       table; imports materialize exported names. *)
-  208    DefUnit                               (. VAR m1, m2, pn: SymTab.Name; .)
-  209      = "DEFINITION" "MODULE"
-  210        GetIdent<m1>                      (. IF NOT SymTab.BeginDef(m1) THEN
-  211                                               SemError(200) END;
-  212                                             QbeGen.SetModule(m1); .)
-  213        ";"
-  214        { Import }
-  215        [ "EXPORT" [ "QUALIFIED" ]        (. (* definition-module export
-  216                                                list: parsed, and the
-  217                                                names are already exported
-  218                                                by the module scope *) .)
-  219          GetIdent<pn> { "," GetIdent<pn> } ";" ]
-  220        { ConstBlock | TypeBlock<TRUE> | VarBlock
-  221        | ProcHeading<pn, SymTab.InvalidType> ";"
-  222                                          (. SymTab.CloseProc;
-  223                                               QbeGen.AbortFunc; .) }
-  224                                          (. astUnit := AST.MakeNode(AST.NkUnit);
-  225                                             AST.SetChild(astUnit, 0,
-  226                                               AST.MakeLeaf(AST.NkIdent, m1));
-  227                                             astDecl := AST.NoNode;
-  228                                             astStmt := AST.NoNode; .)
-  229        "END"
-  230        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
-  231                                               SemError(202) END;
-  232                                             SymTab.EndUnit; .) .
-  233    ImplUnit                              (. VAR m1, m2: SymTab.Name;
-  234                                               k: CARDINAL;
-  235                                               fname: SymTab.Name;
-  236                                               unres: BOOLEAN;
-  237                                               astNode: AST.Node; .)
-  238      = "IMPLEMENTATION" "MODULE"
-  239        GetIdent<m1> (. IF NOT SymTab.BeginImpl(m1) THEN
-  240                                               SemError(201) END;
-  241                                             astStmt := AST.NoNode;
-  242                                             astDecl := AST.NoNode;
-  243                                             nPendVar := 0;
-  244                                             QbeGen.SetModule(m1); .)
-  245        ";"
-  246        { Import }
-  247        DeclSeq
-  248        [ "BEGIN"                         (. FlushPend;
-  249                                             k := 0;
-  250                                             WHILE k < SymTab.FwdPending() DO
-  251                                               SymTab.FwdInfo(k, fname, unres);
-  252                                               IF unres THEN SemError(201) END;
-  253                                               INC(k)
-  254                                             END;
-  255                                             SymTab.FwdClear;
-  256                                             FwdVarFlush;
-  257                                             QbeGen.BeginInit(m1); .)
-  258          [ StatSeq ]                       (. QbeGen.EndInit; .) ]
-  259        "END"
-  260        GetIdent<m2>                      (. FlushPend;
-  261                                             k := 0;
-  262                                             WHILE k < SymTab.FwdPending() DO
-  263                                               SymTab.FwdInfo(k, fname, unres);
-  264                                               IF unres THEN SemError(201) END;
-  265                                               INC(k)
-  266                                             END;
-  267                                             SymTab.FwdClear;
-  268                                             FwdVarFlush;
-  269                                             astNode := AST.MakeNode(AST.NkUnit);
-  270                                             AST.SetChild(astNode, 0,
-  271                                               AST.MakeLeaf(AST.NkIdent, m1));
-  272                                             AST.SetChild(astNode, 1, astDecl);
-  273                                             AST.SetChild(astNode, 2, astStmt);
-  274                                             astUnit := astNode;
-  275                                             IF NOT SymTab.Equal(m1, m2) THEN
-  276                                               SemError(202) END;
-  277                                             SymTab.EndUnit; .) .
-  278    ProgModule                            (. VAR m1, m2: SymTab.Name;
-  279                                               k: CARDINAL;
-  280                                               fname: SymTab.Name;
-  281                                               unres: BOOLEAN;
-  282                                               astNode: AST.Node; .)
-  283      = "MODULE"
-  284        GetIdent<m1> (. IF NOT SymTab.BeginProg(m1) THEN
-  285                                               SemError(200) END;
-  286                                             astStmt := AST.NoNode;
-  287                                             astDecl := AST.NoNode;
-  288                                             nPendVar := 0;
-  289                                             QbeGen.SetModule(m1); .)
-  290        [ Priority ]
-  291        ";"
-  292        { Import }
-  293        DeclSeq
-  294        [ "BEGIN"                         (. FlushPend;
-  295                                             k := 0;
-  296                                             WHILE k < SymTab.FwdPending() DO
-  297                                               SymTab.FwdInfo(k, fname, unres);
-  298                                               IF unres THEN SemError(201) END;
-  299                                               INC(k)
-  300                                             END;
-  301                                             SymTab.FwdClear;
-  302                                             FwdVarFlush;
-  303                                             QbeGen.BeginBody; .)
-  304          [ StatSeq ] ]
-  305        "END"
-  306        GetIdent<m2>                      (. FlushPend;
-  307                                             k := 0;
-  308                                             WHILE k < SymTab.FwdPending() DO
-  309                                               SymTab.FwdInfo(k, fname, unres);
-  310                                               IF unres THEN SemError(201) END;
-  311                                               INC(k)
-  312                                             END;
-  313                                             SymTab.FwdClear;
-  314                                             FwdVarFlush;
-  315                                             IF NOT SymTab.Equal(m1, m2) THEN
-  316                                               SemError(202) END;
-  317                                             astNode := AST.MakeNode(AST.NkUnit);
-  318                                             AST.SetChild(astNode, 0,
-  319                                               AST.MakeLeaf(AST.NkIdent, m1));
-  320                                             AST.SetChild(astNode, 1, astDecl);
-  321                                             AST.SetChild(astNode, 2, astStmt);
-  322                                             astUnit := astNode;
-  323                                             QbeGen.EndModule(m1);
-  324                                             SymTab.EndUnit; .) .
-  325    DeclSeq                               (. VAR astSeq: AST.Node; .)
-  326      =                                   (. astSeq := AST.MakeNode(AST.NkDeclSeq); .)
-  327        { (. astDecl := AST.NoNode; .)
-  328          ( ConstBlock | TypeBlock<FALSE> | VarBlock | ProcDecl ";"
-  329          | NestedModule ";" | ClassItem ";" )
-  330                                          (. IF astDecl # AST.NoNode THEN
-  331                                               AST.SetChild(astSeq,
-  332                                                 AST.NChild(astSeq), astDecl) END; .) }
-  333                                          (. astDecl := astSeq; .) .
-  334    (* Local module, Wirth form. Declarations lower like top-level ones
-  335       (same QBE module prefix); a BEGIN body becomes an init function
-  336       that main calls; the EXPORT list is hoisted into the enclosing
-  337       scope at END. *)
-  338    NestedModule                          (. VAR m1, m2: SymTab.Name;
-  339                                               expNames: ARRAY [0 .. 63] OF SymTab.Name;
-  340                                               expCount, k: CARDINAL; .)
-  341      = "MODULE"
-  342        GetIdent<m1>                      (. IF NOT SymTab.Enter(m1,
-  343                                               SymTab.KindModule) THEN
-  344                                               SemError(200) END;
-  345                                             SymTab.PushScope;
-  346                                             expCount := 0; .)
-  347        [ Priority ]
-  348        ";"
-  349        { Import }
-  350        [ "EXPORT" [ "QUALIFIED" ]
-  351          GetIdent<expNames[expCount]>    (. INC(expCount); .)
-  352          { "," GetIdent<expNames[expCount]>
-  353                                          (. INC(expCount); .) }
-  354          ";" ]
-  355        DeclSeq
-  356        [ "BEGIN"                         (. QbeGen.BeginInit(m1); .)
-  357          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
-  358        "END"
-  359        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
-  360                                               SemError(202) END;
-  361                                             k := 0;
-  362                                             WHILE k < expCount DO
-  363                                               SymTab.ExportUp(expNames[k]);
-  364                                               INC(k)
-  365                                             END;
-  366                                             SymTab.PopScope; .) .
-  367    Priority
-  368      = "[" integer "]"                   (. SemError(230); .) .
-  369    (* Imports (4.3): FROM materializes the names (unqualified use);
-  370       plain IMPORT only demands the module exists — qualified `L.x`
-  371       materializes on first use (Design). *)
-  372    (* Unknown modules stay unchecked stubs (legacy, so hand-written
-  373       import lines don't fail); a known module's missing export is
-  374       201. *)
-  375    Import                                (. VAR n: SymTab.Name; .)
-  376      = "FROM"
-  377        GetIdent<n>
-  378        "IMPORT"
-  379        ImpList<n> ";"
-  380      | "IMPORT"
-  381        ImpModList ";" .
-  382    ImpList<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
-  383      = ImpName<mod>
-  384        { "," ImpName<mod> } .
-  385    (* Pervasive built-ins imported from SYSTEM (e.g. TSIZE) are
-  386       accepted and ignored: the built-in applies regardless. *)
-  387    ImpName<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
-  388      = GetIdent<n>                       (. IF SymTab.Equal(mod, "libc") THEN
-  389                                               (* intrinsic C library:
-  390                                                  permissive external *)
-  391                                               IF NOT SymTab.DeclareCProc(n) THEN
-  392                                                 SemError(201) END
-  393                                             ELSIF SymTab.ModKnown(mod)
-  394                                               AND NOT SymTab.ImportFrom(mod, n) THEN
-  395                                               SemError(201) END; .)
-  396      | ( "TSIZE" | "SIZE" | "ADR" | "HIGH" | "LEN"
-  397        | "CHR" | "ORD" | "ORDL" | "VAL" | "ABS" | "CAP"
-  398        | "UCHR" | "CHR8" | "UORD"
-  399        | "INC" | "DEC" ) .
-  400    ImpModList                            (. VAR n: SymTab.Name; .)
-  401      = GetIdent<n>
-  402        { "," GetIdent<n> } .
-  403    (* Opaque TYPE declarations (definition modules). The targetless
-  404       alias resolves to InvalidType until step 4 completes it. *)
-  405    (* Scalar-phase TYPEs: named types, integer subranges, enumerations.
-  406       Opaque "TYPE T;" needs isDef (definition units); elsewhere 231.
-  407       Composite forms (ARRAY/RECORD/SET/POINTER) arrive with step 3. *)
-  408    TypeBlock<isDef: BOOLEAN>
-  409      = "TYPE"                            (. SymTab.BeginTypeBlock; .)
-  410        { TypeItem<isDef> ";" | ClassItem ";" }
-  411                                          (. SymTab.EndTypeBlock; .) .
-  412    TypeItem<isDef: BOOLEAN>              (. VAR n: SymTab.Name;
-  413                                               t, op: SymTab.TypeIndex;
-  414                                               astNode: AST.Node; .)
-  415      = GetIdent<n>                       (. op := SymTab.OpaqueBase(n);
-  416                                             IF op = SymTab.InvalidType THEN
-  417                                               IF NOT SymTab.Enter(n,
-  418                                                  SymTab.KindType) THEN
-  419                                                 SemError(200) END
-  420                                             END; .)
-  421        ( "=" Type<t, FALSE> (. astNode := AST.MakeNode(AST.NkTypeDecl);
-  422                                               AST.SetChild(astNode, 0,
-  423                                                 AST.MakeLeaf(AST.NkIdent, n));
-  424                                               AST.SetTy(astNode, t);
-  425                                               astDecl := astNode;
-  426                                               IF op # SymTab.InvalidType THEN
-  427                                               SymTab.SetTarget(op, t)
-  428                                             ELSE SymTab.SetSymType(n, t)
-  429                                             END; .)
-  430        |                                 (. IF op # SymTab.InvalidType THEN
-  431                                               (* stays opaque *)
-  432                                             ELSIF NOT isDef THEN
-  433                                               SemError(231)
-  434                                             ELSE SymTab.SetSymType(n,
-  435                                               SymTab.NewAlias()) END; .) ) .
-  436    Type<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
-  437      = TypeIdent<t> [ Subrange<t> ]     (* anchored subrange: T[lo..hi] *)
-  438      | Subrange<t>
-  439      | Enum<t>
-  440      | ArrayType<t, allowOpen>
-  441      | SetType<t>
-  442      | RecordType<t>
-  443      | PointerType<t>
-  444      | ProcType<t> .
-  445    PointerType<VAR t: SymTab.TypeIndex>  (. VAR base: SymTab.TypeIndex; .)
-  446      = "POINTER" "TO" Type<base, FALSE>(. t := SymTab.NewPtr(base); .) .
-  447    (* Procedure types (step 8.5): PROCEDURE (params): result. Values
-  448       are code pointers; params are collected into the descriptor. *)
-  449    ProcType<VAR t: SymTab.TypeIndex>     (. VAR res, pt: SymTab.TypeIndex;
-  450                                               isV: BOOLEAN; .)
-  451      = "PROCEDURE"                       (. res := SymTab.InvalidType;
-  452                                             t := SymTab.NewProcType(res); .)
-  453        [ "(" [ ProcTypeSection<t> { ";" ProcTypeSection<t> } ] ")" ]
-  454        [ ":" TypeIdent<res>              (. SymTab.SetProcTypeRes(t, res); .) ] .
-  455    ProcTypeSection<t: SymTab.TypeIndex>  (. VAR pt: SymTab.TypeIndex;
-  456                                               isV: BOOLEAN;
-  457                                               cnt, k: CARDINAL;
-  458                                               names: ARRAY [0 .. 15] OF SymTab.Name; .)
-  459      =                                   (. isV := FALSE; cnt := 0; .)
-  460        [ "VAR"                           (. isV := TRUE; .) ]
-  461        ( GetIdent<names[cnt]>            (. INC(cnt); .)
-  462          { "," GetIdent<names[cnt]>      (. INC(cnt); .) }
-  463          ( ":" Type<pt, TRUE>           (. k := 0;
-  464                                             WHILE k < cnt DO
-  465                                               SymTab.ProcTypeAdd(t, isV, pt);
-  466                                               INC(k)
-  467                                             END; .)
-  468          |                               (. (* type-only parameter list:
-  469                                                each name is a type (GNU
-  470                                                shorthand used by the
-  471                                                Coco/R scanner frame) *)
-  472                                             k := 0;
-  473                                             WHILE k < cnt DO
-  474                                               IF SymTab.Lookup(names[k])
-  475                                                  AND ((SymTab.SymKind(names[k]) = SymTab.KindType)
-  476    OR (SymTab.SymKind(names[k]) = SymTab.KindPredef)) THEN
-  477                                                 pt := SymTab.SymType(names[k])
-  478                                               ELSE SemError(201);
-  479                                                 pt := SymTab.InvalidType
-  480                                               END;
-  481                                               SymTab.ProcTypeAdd(t, isV, pt);
-  482                                               INC(k)
-  483                                             END; .) )
-  484        | Type<pt, TRUE>                 (. (* unnamed parameter (PIM):
-  485                                                e.g. PROCEDURE (VAR ARRAY OF REAL) *)
-  486                                             SymTab.ProcTypeAdd(t, isV, pt); .) ) .
-  487    (* Arrays: "OF" without bounds is an open formal (allowed only
-  488       where allowOpen); "[lo..hi, ...]" nests bounded levels inside
-  489       out. Bounds are folded literals (int/char); anything else 230.
-  490       Bare-type indices ("ARRAY Color OF") wait for enum ordinals. *)
-  491    ArrayType<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
-  492                                          (. VAR elem: SymTab.TypeIndex;
-  493                                               ok: BOOLEAN;
-  494                                               bnds, bndh: ARRAY [0 .. 7] OF INTEGER;
-  495                                               nb, k: CARDINAL;
-  496                                               idx: SymTab.TypeIndex;
-  497                                               ilo, ihi: INTEGER; .)
-  498      = "ARRAY"
-  499        ( "OF" Type<elem, FALSE>          (. IF NOT allowOpen THEN
-  500                                               SemError(230) END;
-  501                                             t := SymTab.NewOpenArray(elem); .)
-  502        | TypeIdent<idx> [ Subrange<idx> ]
-  503          "OF" Type<elem, FALSE>          (. (* index-type array: the index
-  504                                                type's ordinal bounds give the
-  505                                                [lo..hi] pair *)
-  506                                             IF SymTab.TypeBounds(idx, ilo,
-  507                                                ihi)
-  508                                             THEN t := SymTab.NewArrayB(elem,
-  509                                                    ilo, ihi)
-  510                                             ELSE SemError(230);
-  511                                               t := SymTab.InvalidType
-  512                                             END; .)
-  513        | "["                             (. SymTab.BoundBegin; ok := TRUE; .)
-  514          BoundPair<ok>
-  515          { "," BoundPair<ok> }
-  516          "]"                             (. (* snapshot before the element
-  517                                                type, which reuses the bound
-  518                                                buffer for a nested ARRAY *)
-  519                                             nb := SymTab.BoundCount();
-  520                                             k := 0;
-  521                                             WHILE k < nb DO
-  522                                               bnds[k] := SymTab.BoundLo(k);
-  523                                               bndh[k] := SymTab.BoundHi(k);
-  524                                               INC(k)
-  525                                             END; .)
-  526          "OF" Type<elem, FALSE>
-  527                                          (. IF ok THEN
-  528                                               k := nb;
-  529                                               WHILE k > 0 DO
-  530                                                 DEC(k);
-  531                                                 elem := SymTab.NewArrayB(
-  532                                                   elem, bnds[k], bndh[k])
-  533                                               END;
-  534                                               t := elem
-  535                                             ELSE t := SymTab.InvalidType
-  536                                             END; .) ) .
-  537    BoundPair<VAR ok: BOOLEAN>            (. VAR tlo, thi: SymTab.TypeIndex;
-  538                                               qlo, qhi: QbeGen.QVal;
-  539                                               lo, hi: INTEGER;
-  540                                               cl, cl2: INTEGER; .)
-  541      = Expr<tlo, qlo> ".." Expr<thi, qhi>
-  542                                          (. IF (tlo = SymTab.InvalidType)
-  543                                              OR (thi = SymTab.InvalidType) THEN
-  544                                             ok := FALSE
-  545                                           ELSE cl := SymTab.ClassOf(tlo);
-  546                                             cl2 := SymTab.ClassOf(thi);
-  547                                             IF ((cl # SymTab.ClInt)
-  548   AND (cl # SymTab.ClChar))
-  549                                                OR ((cl2 # SymTab.ClInt)
-  550   AND (cl2 # SymTab.ClChar)) THEN
-  551                                               SemError(230); ok := FALSE
-  552                                             ELSIF NOT SymTab.ConstInt(qlo, lo)
-  553                                                OR NOT SymTab.ConstInt(qhi, hi)
-  554                                                OR (lo > hi) THEN
-  555                                               SemError(230); ok := FALSE
-  556                                              ELSIF NOT SymTab.BoundAdd(lo, hi) THEN
-  557                                                SemError(230); ok := FALSE
-  558                                              END;
-  559                                            END; .) .
-  560    (* Sets: multi-word masks over bases ≤ 256 values (bool, char,
-  561       bounded subranges; enums wait for ordinals, INTEGER is
-  562       unbounded). Literals are SET OF [0..255]; assignment and
-  563       comparison across suitable bases are lenient (masks over min
-  564       words + zero-check extras), out-of-span literals are 222. *)
-  565    SetType<VAR t: SymTab.TypeIndex>      (. VAR base: SymTab.TypeIndex;
-  566                                               blo, bhi, bspan: INTEGER;
-  567                                               bcls: INTEGER; .)
-  568      = "SET" "OF" Type<base, FALSE>
-  569                                          (. IF base = SymTab.InvalidType THEN
-  570                                               t := SymTab.InvalidType
-  571                                             ELSE bcls :=
-  572                                                    SymTab.ClassOf(base);
-  573                                               IF bcls = SymTab.ClBool THEN
-  574                                                 blo := 0; bspan := 2
-  575                                               ELSIF bcls = SymTab.ClChar THEN
-  576                                                 blo := 0; bspan := 256
-  577                                               ELSIF bcls = SymTab.ClEnum THEN
-  578                                                 blo := 0;
-  579                                                 bspan := VAL(INTEGER,
-  580                                                   SymTab.EnumCount(base))
-  581                                               ELSIF SymTab.SubBounds(base,
-  582                                                       blo, bhi) THEN
-  583                                                 bspan := bhi - blo + 1
-  584                                               ELSE bspan := 0 END;
-  585                                               IF (bspan <= 0)
-  586                                                  OR (bspan > 65536) THEN
-  587                                                 SemError(230);
-  588                                                 t := SymTab.InvalidType
-  589                                               ELSE t := SymTab.NewSet(base)
-  590                                               END
-  591                                             END; .) .
-  592    (* Records: flat blobs; array fields are pointers to static
-  593       descriptors (locked amendment), nested records inline. Field
-  594       offsets static and declaration-ordered. *)
-  595    (* Field list: plain fields and (optionally) one variant part.  The
-  596       variant part is a `CASE ... END` item; because it starts with the
-  597       CASE keyword it is unambiguously distinguishable from a field
-  598       (which starts with an identifier). *)
-  599    RecordType<VAR t: SymTab.TypeIndex>   (. VAR t2: SymTab.TypeIndex;
-  600                                               tagOk: BOOLEAN; .)
-  601      = "RECORD"                          (. t := SymTab.NewRecord(); .)
-  602        [ RecItem<t> { ";" [ RecItem<t> ] } ]
-  603        "END" .
-  604    RecItem<rec: SymTab.TypeIndex>        (. VAR tt: SymTab.TypeIndex; .)
-  605      = RecField<rec>
-  606      | CaseField<rec>                    (. SymTab.MarkVariant(rec); .) .
-  607    (* A variant part: CASE tag : Type OF variants.  The layout overlays
-  608       every branch from the tag slot (see SymTab.ComputeOffsets). *)
-  609    CaseField<rec: SymTab.TypeIndex>      (. VAR tagT: SymTab.TypeIndex;
-  610                                               tagN: SymTab.Name; .)
-  611      = "CASE"                            (. SymTab.ResetFields(rec); .)
-  612        GetIdent<tagN>                    (. IF NOT SymTab.FieldPending(rec,
-  613                                               tagN) THEN
-  614                                               SemError(200) END; .)
-  615        ":" Type<tagT, FALSE>             (. IF (tagT # SymTab.InvalidType)
-  616    AND NOT SymTab.IsOrdinal(tagT) THEN
-  617                                               SemError(224)
-  618                                             END;
-  619                                             SymTab.FixPendingF(rec, tagT);
-  620                                             SymTab.SetVariantTag(rec, tagN); .)
-  621        "OF"
-  622        RecFieldList<rec>
-  623        { "|"                             (. SymTab.ResetFields(rec); .)
-  624          RecFieldList<rec> }
-  625        "END" .
-  626    RecFieldList<rec: SymTab.TypeIndex>   (. VAR lt, lq: SymTab.TypeIndex;
-  627                                               lv1, lv2: QbeGen.QVal; .)
-  628      = VarLabel<lt, lv1> [ ".." VarLabel<lq, lv2> ] ":"
-  629        RecField<rec> { ";" [ RecField<rec> ] } .
-  630    (* Variant case label: a constant (or a constant range).  Values are
-  631       not interpreted (the layout overlays regardless). *)
-  632    VarLabel<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
-  633                                          (. VAR lname: SymTab.Name; .)
-  634      = ( ident                         (. LexName(lname);
-  635                                             QbeGen.CopyOp("0", q);
-  636                                             t := SymTab.IntType(); .)
-  637        | integer                       (. LexString(lname);
-  638                                             QbeGen.CopyOp("0", q);
-  639                                             t := SymTab.IntType(); .)
-  640        | charConst                     (. LexString(lname);
-  641                                             QbeGen.CopyOp("0", q);
-  642                                             t := SymTab.CharType(); .) ) .
-  643    RecField<rec: SymTab.TypeIndex>       (. VAR n: SymTab.Name;
-  644                                               t2: SymTab.TypeIndex; .)
-  645      = RecIdents<rec> ":" Type<t2, FALSE>(. SymTab.FixPendingF(rec, t2); .) .
-  646    RecIdents<rec: SymTab.TypeIndex>      (. VAR n: SymTab.Name; .)
-  647      = GetIdent<n>                       (. IF NOT SymTab.FieldPending(rec,
-  648                                               n) THEN
-  649                                               SemError(200) END; .)
-  650        { "," GetIdent<n>                 (. IF NOT SymTab.FieldPending(rec,
-  651                                               n) THEN
-  652                                               SemError(200) END; .) } .
-  653    TypeIdent<VAR t: SymTab.TypeIndex>    (. VAR n, qid: SymTab.Name;
-  654                                               k: INTEGER;
-  655                                               dotted: BOOLEAN; .)
-  656      = GetIdent<n>                       (. dotted := FALSE;
-  657                                             IF NOT SymTab.Lookup(n) THEN
-  658                                               k := -1;
-  659                                               t := SymTab.ForwardType(n);
-  660                                               IF t = SymTab.InvalidType THEN
-  661                                                 SemError(201)
-  662                                               END
-  663                                             ELSE k := SymTab.SymKind(n);
-  664                                               IF (k = SymTab.KindType)
-  665                                                  OR (k = SymTab.KindPredef) THEN
-  666                                                 t := SymTab.SymType(n)
-  667                                               ELSE t := SymTab.InvalidType
-  668                                               END
-  669                                             END; .)
-  670        [ "." GetIdent<qid>               (. dotted := TRUE;
-  671                                             IF k = SymTab.KindModule THEN
-  672                                               t := SymTab.QualType(n, qid);
-  673                                               IF t = SymTab.InvalidType THEN
-  674                                                 SemError(201)
-  675                                               END
-  676                                             ELSE SemError(221);
-  677                                               t := SymTab.InvalidType
-  678                                             END; .) ]
-  679                                          (. IF NOT dotted THEN
-  680                                               IF (k = SymTab.KindModule)
-  681                                                  OR ((k # SymTab.KindType)
-  682    AND (k # SymTab.KindPredef)
-  683    AND (k # SymTab.KindImport)
-  684    AND (k # -1)) THEN
-  685                                                 SemError(221)
-  686                                               END
-  687                                             END; .) .
-  688    Subrange<VAR t: SymTab.TypeIndex>     (. VAR tlo, thi: SymTab.TypeIndex;
-  689                                               qlo, qhi: QbeGen.QVal;
-  690                                               lo, hi: INTEGER; .)
-  691      = "[" Expr<tlo, qlo> ".." Expr<thi, qhi>
-  692                                          (. IF (tlo = SymTab.InvalidType)
-  693                                              OR (thi = SymTab.InvalidType) THEN
-  694                                             t := SymTab.InvalidType
-  695                                           ELSIF NOT SymTab.IsOrdinal(tlo)
-  696                                              OR NOT SymTab.IsOrdinal(thi) THEN
-  697                                             SemError(230);
-  698                                             t := SymTab.InvalidType
-  699                                           ELSIF NOT SymTab.ConstInt(qlo, lo)
-  700                                              OR NOT SymTab.ConstInt(qhi, hi)
-  701                                              OR (lo > hi) THEN
-  702                                             SemError(230);
-  703                                             t := SymTab.InvalidType
-  704                                           ELSE t := SymTab.NewSubR(lo, hi)
-  705                                           END; .)
-  706        "]" .
-  707    Enum<VAR t: SymTab.TypeIndex>         (. VAR n: SymTab.Name;
-  708                                               ord: INTEGER;
-  709                                               qv: QbeGen.QVal; .)
-  710      = "("                               (. t := SymTab.NewEnum();
-  711                                             ord := 0; .)
-  712        GetIdent<n>                       (. IF NOT SymTab.Enter(n,
-  713                                               SymTab.KindConst) THEN
-  714                                               SemError(200) END;
-  715                                             SymTab.SetSymType(n, t);
-  716                                             QbeGen.IntStr(ord, qv);
-  717                                             SymTab.SetSymVal(n, qv);
-  718                                             INC(ord); .)
-  719        { "," GetIdent<n>                 (. IF NOT SymTab.Enter(n,
-  720                                               SymTab.KindConst) THEN
-  721                                               SemError(200) END;
-  722                                             SymTab.SetSymType(n, t);
-  723                                             QbeGen.IntStr(ord, qv);
-  724                                             SymTab.SetSymVal(n, qv);
-  725                                             INC(ord); .) }
-  726        ")"                               (. SymTab.SetEnumCount(t,
-  727                                               VAL(CARDINAL, ord)); .) .
-  728    (* Clarion-form classes (docs/OOP.txt): declaration + single
-  729       inheritance + IMPLEMENTATION blocks. Scopes and member checks
-  730       now; lowering (vtable, dispatch, THIS) later — one 230 per
-  731       class/impl block. Methods end with ";" per the Table example
-  732       (not "," as in the sketch). No underscores in identifiers. *)
-  733    (* Single CLASS item in both loops: separating declaration from
-  734       IMPLEMENTATION at the loop level needs 2-token lookahead
-  735       (CLASS ident vs CLASS IMPLEMENTATION), which LL(1) cannot do.
-  736       The second token decides after CLASS is consumed. A misplaced
-  737       CLASS IMPLEMENTATION inside TYPE still parses (harmless: the
-  738       whole unit ends 230 until lowering). *)
-  739    ClassItem
-  740      = "CLASS" ( "IMPLEMENTATION" ClassImplRest | ClassRest ) .
-  741    ClassRest                             (. VAR cn, m2, pn: SymTab.Name;
-  742                                               ct: SymTab.TypeIndex; .)
-  743      = GetIdent<cn>                      (. IF NOT SymTab.Enter(cn,
-  744                                               SymTab.KindType) THEN
-  745                                               SemError(200) END;
-  746                                             ct := SymTab.NewClass();
-  747                                             SymTab.SetSymType(cn, ct);
-  748                                             SymTab.PushClassScope(ct); .)
-  749        [ Parents<ct> ]
-  750        ";"
-  751        { ClassField<ct> ";" }
-  752        { MethodHeading<pn, SymTab.InvalidType> ";"
-  753                                          (. SymTab.CloseProc;
-  754                                             QbeGen.AbortFunc; .) }
-  755        "END"
-  756        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
-  757                                               SemError(202) END;
-  758                                             SymTab.LayoutClass(ct);
-  759                                             SymTab.PopScope; .) .
-  760    Parents<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name; .)
-  761      = "(" Parent1<ct>
-  762        { "," GetIdent<p>                 (. SemError(230); .) }
-  763        ")" .
-  764    Parent1<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name;
-  765                                               pt: SymTab.TypeIndex; .)
-  766      = GetIdent<p>                       (. IF NOT SymTab.Lookup(p) THEN
-  767                                               SemError(201)
-  768                                             ELSE pt := SymTab.SymType(p);
-  769                                               IF SymTab.ClassOf(pt) #
-  770                                                  SymTab.ClClass THEN
-  771                                                 SemError(230)
-  772                                               ELSE SymTab.SetParent(ct, pt)
-  773                                               END
-  774                                             END; .) .
-  775    ClassField<ct: SymTab.TypeIndex>      (. VAR n, rhs: SymTab.Name;
-  776                                               t: SymTab.TypeIndex; .)
-  777      = GetIdent<n>
-  778        ( "=" GetIdent<rhs>               (. IF NOT SymTab.Enter(n,
-  779                                               SymTab.KindConst) THEN
-  780                                               SemError(200) END;
-  781                                             IF SymTab.Lookup(rhs) THEN
-  782                                               SymTab.SetSymType(n,
-  783                                                 SymTab.SymType(rhs))
-  784                                             END; .)
-  785        |                                 (. IF NOT SymTab.FieldPending(ct,
-  786                                               n) THEN
-  787                                               SemError(200) END; .)
-  788          { "," GetIdent<n>               (. IF NOT SymTab.FieldPending(ct,
-  789                                               n) THEN
-  790                                               SemError(200) END; .) }
-  791          ":" Type<t, FALSE>              (. SymTab.FixPendingF(ct, t); .) ) .
-  792    MethodHeading<VAR pn: SymTab.Name; ct: SymTab.TypeIndex>
-  793                                          (. VAR wantVirt: BOOLEAN; .)
-  794      =                                   (. wantVirt := FALSE; .)
-  795        [ "VIRTUAL"                       (. wantVirt := TRUE; .) ]
-  796        ProcHeading<pn, ct>               (. IF wantVirt THEN
-  797                                               SymTab.MarkVirtual END; .) .
-  798    ClassImplRest                         (. VAR cn, m2: SymTab.Name;
-  799                                               ct: SymTab.TypeIndex; .)
-  800      = GetIdent<cn>                      (. IF NOT SymTab.Lookup(cn) THEN
-  801                                               SemError(201);
-  802                                               ct := SymTab.InvalidType
-  803                                             ELSE ct := SymTab.SymType(cn);
-  804                                               IF SymTab.ClassOf(ct) #
-  805                                                  SymTab.ClClass THEN
-  806                                                 SemError(230);
-  807                                                 ct := SymTab.InvalidType
-  808                                               END
-  809                                             END;
-  810                                             IF ct #
-  811                                                SymTab.InvalidType THEN
-  812                                               IF NOT SymTab.PushClassMembers(
-  813                                                      ct) THEN
-  814                                                 SemError(230) END;
-  815                                               SymTab.PushImplClass(ct)
-  816                                             END; .)
-  817        ";" { MethodImpl<ct> ";" }
-  818        [ "BEGIN"                         (. QbeGen.BeginInit(cn); .)
-  819          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
-  820        "END"
-  821        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
-  822                                               SemError(202) END;
-  823                                             SymTab.PopImplClass;
-  824                                             SymTab.PopScope; .) .
-  825    MethodImpl<ct: SymTab.TypeIndex>      (. VAR pn: SymTab.Name;
-  826                                               thisQ: QbeGen.QVal;
-  827                                               methRes: SymTab.TypeIndex; .)
-  828      = MethodHeading<pn, ct> ";"
-  829                                          (. IF (ct #
-  830                                                SymTab.InvalidType)
-  831   AND NOT SymTab.MethodExists(ct,
-  832                                                    pn) THEN
-  833                                               SemError(201) END; .)
-  834        ( "FORWARD"                       (. SymTab.MarkFwd;
-  835                                             QbeGen.AbortFunc;
-  836                                             SymTab.CloseProc; .)
-  837        |                                 (. QbeGen.EndFuncHeader;
-  838                                             (* bind the receiver: bare
-  839                                                field names resolve
-  840                                                against THIS *)
-  841                                             QbeGen.ThisBase(thisQ);
-  842                                             QbeGen.PushWith(thisQ); .)
-  843          Block<pn>                       (. QbeGen.PopWith;
-  844                                             methRes := SymTab.CurRes();
-  845                                             SymTab.CloseProc;
-  846                                             QbeGen.EndFunc(methRes); .) ) .
-  847    ConstBlock                            (. VAR astSeq: AST.Node; .)
-  848      = "CONST"                           (. astSeq := AST.MakeNode(AST.NkDeclSeq);
-  849                                             astDecl := AST.NoNode; .)
-  850        { ConstDecl ";"                   (. IF astDecl # AST.NoNode THEN
-  851                                               AST.SetChild(astSeq,
-  852                                                 AST.NChild(astSeq), astDecl) END; .) }
-  853                                          (. astDecl := astSeq; .) .
-  854    ConstDecl                             (. VAR n: SymTab.Name;
-  855                                               t: SymTab.TypeIndex;
-  856                                               qv: QbeGen.QVal;
-  857                                               cls: INTEGER;
-  858                                               astNode: AST.Node; .)
-  859      = GetIdent<n>                       (. IF NOT SymTab.Enter(n,
-  860                                               SymTab.KindConst) THEN
-  861                                               SemError(200) END; .)
-  862        "="
-  863        Expr<t, qv> (. astNode := AST.MakeNode(AST.NkConstDecl);
-  864                                             AST.SetChild(astNode, 0,
-  865                                               AST.MakeLeaf(AST.NkIdent, n));
-  866                                             AST.SetChild(astNode, 1, astCur);
-  867                                             AST.SetTy(astNode, t);
-  868                                             astDecl := astNode;
-  869                                             SymTab.SetSymType(n, t);
-  870                                             cls := SymTab.ClassOf(t);
-  871                                             IF (cls = SymTab.ClArray)
-  872                                                OR (cls = SymTab.ClRecord)
-  873                                                OR (cls = SymTab.ClClass)
-  874                                                OR (cls = SymTab.ClStr)
-  875                                                OR (cls = SymTab.ClUStr) THEN
-  876                                               (* an aggregate/string
-  877                                                  constant: qv is its
-  878                                                  descriptor address; no
-  879                                                  scalar data *)
-  880                                               SymTab.SetSymVal(n, qv)
-  881                                             ELSIF NOT QbeGen.IsImm(qv) THEN
-  882                                               SemError(230)
-  883                                             ELSE
-  884                                               SymTab.SetSymVal(n, qv);
-  885                                               QbeGen.DeclConst(n, qv, t)
-  886                                             END; .) .
-  887    VarBlock                              (. VAR astSeq: AST.Node; .)
-  888      = "VAR"                             (. astSeq := AST.MakeNode(AST.NkDeclSeq);
-  889                                             astDecl := AST.NoNode; .)
-  890        { VarDecl ";"                     (. IF astDecl # AST.NoNode THEN
-  891                                               AST.SetChild(astSeq,
-  892                                                 AST.NChild(astSeq), astDecl) END; .) }
-  893                                          (. astDecl := astSeq; .) .
-  894    VarDecl                               (. VAR nm: SymTab.Name;
-  895                                               t: SymTab.TypeIndex;
-  896                                               i: CARDINAL;
-  897                                               cls: INTEGER;
-  898                                               astNode: AST.Node; .)
-  899      = VarIdents ":"
-  900        Type<t, FALSE> (. astNode := AST.MakeNode(AST.NkVarDecl);
-  901                                             i := 0;
-  902                                             WHILE i < SymTab.PendCount() DO
-  903                                               SymTab.PendName(i, nm);
-  904                                               AST.SetChild(astNode,
-  905                                                 AST.NChild(astNode),
-  906                                                 AST.MakeLeaf(AST.NkIdent, nm));
-  907                                               INC(i)
-  908                                             END;
-  909                                             AST.SetTy(astNode, t);
-  910                                             astDecl := astNode;
-  911                                             cls := SymTab.ClassOf(t);
-  912                                             IF (t # SymTab.InvalidType)
-  913   AND NOT SymTab.IsUnresolved(t)
-  914   AND (cls # SymTab.ClInt)
-  915   AND (cls # SymTab.ClBool)
-  916   AND (cls # SymTab.ClChar)
-  917   AND (cls # SymTab.ClReal)
-  918   AND (cls # SymTab.ClArray)
-  919   AND (cls # SymTab.ClSet)
-  920   AND (cls # SymTab.ClRecord)
-  921   AND (cls # SymTab.ClPtr)
-  922   AND (cls # SymTab.ClLong)
-  923   AND (cls # SymTab.ClProc)
-  924   AND (cls # SymTab.ClUChar)
-  925   AND (cls # SymTab.ClUStr)
-  926   AND (cls # SymTab.ClEnum)
-  927   AND (cls # SymTab.ClClass) THEN
-  928                                               SemError(230) END;
-  929                                             IF QbeGen.LocFull() THEN
-  930                                               SemError(233) END;
-  931                                             i := 0;
-  932                                             IF SymTab.IsUnresolved(t)
-  933                                                AND NOT SymTab.InProc() THEN
-  934                                               (* a forward-typed global:
-  935                                                  defer emission until the
-  936                                                  TYPE block completes *)
-  937                                               WHILE i < SymTab.PendCount() DO
-  938                                                 SymTab.PendName(i, nm);
-  939                                                 IF nPendVar <=
-  940                                                    HIGH(pendVarName) THEN
-  941                                                   pendVarName[nPendVar] := nm;
-  942                                                   pendVarT[nPendVar] := t;
-  943                                                   INC(nPendVar)
-  944                                                 END;
-  945                                                 INC(i)
-  946                                               END
-  947                                             ELSE
-  948                                               WHILE i < SymTab.PendCount() DO
-  949                                                 SymTab.PendName(i, nm);
-  950                                                 QbeGen.DeclVar(nm, t);
-  951                                                 INC(i)
-  952                                               END
-  953                                             END;
-  954                                             (* a plain VAR list, not a
-  955                                                heading: the signature
-  956                                                result is discarded *)
-  957                                             IF NOT SymTab.FixPending(t) THEN
-  958                                             END; .) .
-  959    VarIdents                             (. VAR n: SymTab.Name; .)
-  960      = GetIdent<n>                       (. IF NOT SymTab.EnterPending(n,
-  961                                               SymTab.KindVar) THEN
-  962                                               SemError(200) END; .)
-  963        { ","
-  964          GetIdent<n>                     (. IF NOT SymTab.EnterPending(n,
-  965                                               SymTab.KindVar) THEN
-  966                                               SemError(200) END; .) } .
-  967    ParIdents<isV: BOOLEAN>               (. VAR n: SymTab.Name; .)
-  968      = GetIdent<n>                       (. IF NOT SymTab.EnterParam(n, isV) THEN
-  969                                               SemError(200) END; .)
-  970        { "," GetIdent<n>                 (. IF NOT SymTab.EnterParam(n, isV) THEN
-  971                                               SemError(200) END; .) } .
-  972    (* Procedure headings enter scopes/params/result and buffer the
-  973       QBE header; bodies lower to functions (4.1, module level only).
-  974       FORWARD marks; the body heading re-enters (signature compare
-  975       deferred). Nested procedures parse + check, lowering = 4.2. *)
-  976    ProcHeading<VAR pn: SymTab.Name; methCls: SymTab.TypeIndex>
-  977                                          (. VAR t: SymTab.TypeIndex;
-  978                                               mg: QbeGen.QVal; .)
-  979      = "PROCEDURE"
-  980        GetIdent<pn>                      (. IF methCls #
-  981                                                SymTab.InvalidType THEN
-  982                                             (* a method: resume the
-  983                                                declared symbol (reuse
-  984                                                its uid) *)
-  985                                             IF NOT SymTab.ResumeMethod(
-  986                                                  methCls, pn) THEN
-  987                                               SemError(200) END
-  988                                             ELSIF NOT SymTab.EnterProc(pn) THEN
-  989                                             IF NOT SymTab.ReenterProc(pn) THEN
-  990                                               IF NOT SymTab.ResumeProc(pn) THEN
-  991                                                 SemError(200) END
-  992                                               END
-  993                                             END;
-  994                                             IF methCls #
-  995                                                SymTab.InvalidType THEN
-  996                                               QbeGen.Mangled(pn,
-  997                                                 SymTab.MethUid(), mg)
-  998                                             ELSE
-  999                                               QbeGen.Mangled(pn,
- 1000                                                 SymTab.ProcUid(pn), mg)
- 1001                                             END;
- 1002                                             QbeGen.BeginFunc(mg);
- 1003                                             IF methCls #
- 1004                                                SymTab.InvalidType THEN
- 1005                                               (* hidden THIS receiver:
- 1006                                                  a VAR param of the
- 1007                                                  class type, pushed as
- 1008                                                  the WITH base *)
- 1009                                               IF NOT SymTab.EnterThisParam(
- 1010                                                    methCls) THEN
- 1011                                                 SemError(200) END;
- 1012                                               IF NOT QbeGen.FuncParam(
- 1013                                                    "THIS", TRUE,
- 1014                                                    methCls) THEN
- 1015                                                 SemError(233) END
- 1016                                             END; .)
- 1017        [ FormalParams ]
- 1018        [ ":" TypeIdent<t>                (. IF NOT SymTab.SetProcRes(t) THEN
- 1019                                               SemError(235) END;
- 1020                                             QbeGen.SetFuncRes(t);
- 1021                                             IF (t #
- 1022                                                SymTab.InvalidType)
- 1023   AND ((SymTab.ClassOf(t)
- 1024                                                   = SymTab.ClArray)
- 1025                                                OR (SymTab.ClassOf(t)
- 1026                                                   = SymTab.ClRecord)
- 1027                                                OR (SymTab.ClassOf(t)
- 1028                                                   = SymTab.ClSet)
- 1029                                                OR (SymTab.ClassOf(t)
- 1030                                                   = SymTab.ClClass)) THEN
- 1031                                               SemError(230) END; .) ] .
- 1032    FormalParams
- 1033      = "(" [ ParamSection { ";" ParamSection } ] ")" .
- 1034    ParamSection                          (. VAR t: SymTab.TypeIndex;
- 1035                                               nm: SymTab.Name;
- 1036                                               i: CARDINAL;
- 1037                                               isV: BOOLEAN; .)
- 1038      =                                   (. isV := FALSE; .)
- 1039        [ "VAR"                           (. isV := TRUE; .) ]
- 1040        ParIdents<isV> ":" Type<t, TRUE>  (. i := 0;
- 1041                                             WHILE i < SymTab.PendCount() DO
- 1042                                               SymTab.PendName(i, nm);
- 1043                                               (* value open arrays are
- 1044                                                  passed as descriptor
- 1045                                                  addresses (no copy):
- 1046                                                  same representation as
- 1047                                                  VAR formals *)
- 1048                                               IF NOT QbeGen.FuncParam(nm,
- 1049                                                    isV
- 1050                                                    OR SymTab.IsOpenArray(t),
- 1051                                                    t) THEN
- 1052                                                 SemError(233) END;
- 1053                                               INC(i)
- 1054                                             END;
- 1055                                             IF NOT SymTab.FixPending(t) THEN
- 1056                                               SemError(235) END; .) .
- 1057    (* Nested procedures lower like top-level ones (4.2): the
- 1058       static link gives them their parent's frame. Methods keep
- 1059       parse-now/230-later. *)
- 1060    ProcDecl                              (. VAR pn: SymTab.Name;
- 1061                                               astNode: AST.Node; .)
- 1062      = ProcHeading<pn, SymTab.InvalidType> ";"
- 1063                                          (. astNode := AST.MakeNode(AST.NkProcDecl);
- 1064                                             AST.SetChild(astNode, 0,
- 1065                                               AST.MakeLeaf(AST.NkIdent, pn)); .)
- 1066        ( "FORWARD"                       (. AST.SetOp(astNode, 1);
- 1067                                             astDecl := astNode;
- 1068                                             SymTab.MarkFwd;
- 1069                                             SymTab.CloseProc;
- 1070                                             QbeGen.AbortFunc; .)
- 1071        | "EXTERNAL"                      (. AST.SetOp(astNode, 2);
- 1072                                             astDecl := astNode;
- 1073                                             SymTab.MarkExternal("");
- 1074                                             SymTab.CloseProc;
- 1075                                             QbeGen.AbortFunc; .)
- 1076        |                                 (. QbeGen.EndFuncHeader; .)
- 1077          Block<pn>                       (. AST.SetChild(astNode, 1, astStmt);
- 1078                                             astDecl := astNode;
- 1079                                             SymTab.CloseProc;
- 1080                                             QbeGen.EndFunc(
- 1081                                               SymTab.ProcRes(pn)); .) ) .
- 1082    Block<pn: SymTab.Name>                (. VAR m2: SymTab.Name; .)
- 1083      = DeclSeq                           (. astStmt := AST.NoNode; .)
- 1084        [ "BEGIN"
- 1085          [ StatSeq ] ]
- 1086        "END"
- 1087        GetIdent<m2>                      (. IF NOT SymTab.Equal(pn, m2) THEN
- 1088                                               SemError(202) END; .) .
- 1089    StatSeq                               (. VAR astSeq: AST.Node; .)
- 1090      =                                   (. astSeq := AST.MakeNode(AST.NkBlock); .)
- 1091        Statement                         (. IF astStmt # AST.NoNode THEN
- 1092                                               AST.SetChild(astSeq,
- 1093                                                 AST.NChild(astSeq), astStmt) END; .)
- 1094        { ";" [ Statement                 (. IF astStmt # AST.NoNode THEN
- 1095                                               AST.SetChild(astSeq,
- 1096                                                 AST.NChild(astSeq), astStmt) END; .) ] }
- 1097                                          (. astStmt := astSeq; .) .
- 1098    (* Trailing/empty statements (`a; ; b`, Coco/R's generated `;;`)
- 1099       are accepted: the statement after ';' is optional. *)
- 1100    Statement                             (. VAR lx: QbeGen.QVal; .)
- 1101      = (. astStmt := AST.NoNode; .)
- 1102        ( AssOrCall
- 1103      | IfStat
- 1104      | WhileStat
- 1105      | RepeatStat
- 1106      | LoopStat
- 1107      | ForStat
- 1108      | CaseStat
- 1109      | WithStat
- 1110      | ReturnStat
- 1111      | HaltStat
- 1112      | NewStat
- 1113      | DisposeStat
- 1114      | IncDecStat
- 1115      | InclExclStat
- 1116      | "EXIT"                            (. IF QbeGen.TopLoop(lx) THEN
- 1117                                               QbeGen.Jmp(lx)
- 1118                                             ELSE SemError(230) END;
- 1119                                             astStmt := AST.MakeNode(AST.NkExit); .) ) .
- 1120    (* INCL(set, elem) / EXCL(set, elem): PIM set-element builtins. *)
- 1121    InclExclStat                          (. VAR at, et2: SymTab.TypeIndex;
- 1122                                               dk: INTEGER;
- 1123                                               qd, qe: QbeGen.QVal;
- 1124                                               qn: SymTab.Name;
- 1125                                               sfx, isInc: BOOLEAN;
- 1126                                               astNode, astD: AST.Node; .)
- 1127      = ( "INCL"                          (. isInc := TRUE; .)
- 1128        | "EXCL"                          (. isInc := FALSE; .) )
- 1129        "(" Design<at, dk, qd, qn, sfx> (. astD := astCur; .) ","
- 1130        Expr<et2, qe> ")"
- 1131                                          (. astNode := AST.MakeNode(AST.NkCall);
- 1132                                             IF isInc THEN
- 1133                                               AST.SetChild(astNode, 0,
- 1134                                                 AST.MakeLeaf(AST.NkIdent, "INCL"))
- 1135                                             ELSE AST.SetChild(astNode, 0,
- 1136                                                 AST.MakeLeaf(AST.NkIdent, "EXCL"))
- 1137                                             END;
- 1138                                             IF astD # AST.NoNode THEN
- 1139                                               AST.SetChild(astNode, 1, astD) END;
- 1140                                             IF astCur # AST.NoNode THEN
- 1141                                               AST.SetChild(astNode, 2, astCur) END;
- 1142                                             astStmt := astNode; .)
- 1143                                          (. IF at = SymTab.InvalidType THEN
- 1144                                             ELSIF SymTab.ClassOf(at) #
- 1145                                                   SymTab.ClSet THEN
- 1146                                               SemError(222)
- 1147                                             ELSE
- 1148                                               IF isInc THEN
- 1149                                                 QbeGen.SetBit(qd, qe,
- 1150                                                   SymTab.SetBaseLo(at),
- 1151                                                   SymTab.SetCount(at))
- 1152                                               ELSE
- 1153                                                 QbeGen.SetClearBit(qd, qe,
- 1154                                                   SymTab.SetBaseLo(at),
- 1155                                                   SymTab.SetCount(at))
- 1156                                               END
- 1157                                             END; .) .
- 1158    (* INC(v [,step]) / DEC(v [,step]) as builtin statements over an
- 1159       integer designator. *)
- 1160    IncDecStat                            (. VAR dt, et2: SymTab.TypeIndex;
- 1161                                               dk: INTEGER;
- 1162                                               qd, qv, qn2, qstep:
- 1163                                                 QbeGen.QVal;
- 1164                                               qn: SymTab.Name;
- 1165                                               sfx, isInc: BOOLEAN;
- 1166                                               astNode, astD, astStep:
- 1167                                                 AST.Node; .)
- 1168      =                                   (. isInc := TRUE; .)
- 1169        ( "INC"                           (. isInc := TRUE; .)
- 1170        | "DEC"                           (. isInc := FALSE; .) )
- 1171        "("                               (. QbeGen.CopyOp("1", qstep); astStep := AST.NoNode; .)
- 1172        Design<dt, dk, qd, qn, sfx> (. astD := astCur; .)
- 1173        [ "," Expr<et2, qstep> (. astStep := astCur; .) ]
- 1174        ")"                               (. astNode := AST.MakeNode(AST.NkCall);
- 1175                                             IF isInc THEN
- 1176                                               AST.SetChild(astNode, 0,
- 1177                                                 AST.MakeLeaf(AST.NkIdent, "INC"))
- 1178                                             ELSE AST.SetChild(astNode, 0,
- 1179                                                 AST.MakeLeaf(AST.NkIdent, "DEC"))
- 1180                                             END;
- 1181                                             IF astD # AST.NoNode THEN
- 1182                                               AST.SetChild(astNode, 1, astD) END;
- 1183                                             IF astStep # AST.NoNode THEN
- 1184                                               AST.SetChild(astNode, 2, astStep) END;
- 1185                                             astStmt := astNode; .)                               (. IF dt = SymTab.InvalidType THEN
- 1186                                             ELSIF (dk # SymTab.KindVar)
- 1187   AND (dk # SymTab.KindParam)
- 1188   AND (dk # SymTab.KindField) THEN
- 1189                                               SemError(210)
- 1190                                             ELSIF NOT SymTab.IsIntFamily(dt) THEN
- 1191                                               SemError(211)
- 1192                                             ELSE
- 1193                                               IF sfx
- 1194                                                  OR (dk = SymTab.KindField) THEN
- 1195                                                 QbeGen.ElemLoad(qd, dt, qv)
- 1196                                               ELSE QbeGen.LoadVar(qn,
- 1197                                                 FALSE, qv)
- 1198                                               END;
- 1199                                               QbeGen.NewTemp(qn2);
- 1200                                               IF isInc THEN
- 1201                                                 QbeGen.Op3("add", qn2, qv,
- 1202                                                   qstep, FALSE)
- 1203                                               ELSE QbeGen.Op3("sub", qn2, qv,
- 1204                                                   qstep, FALSE)
- 1205                                               END;
- 1206                                               IF sfx
- 1207                                                  OR (dk = SymTab.KindField) THEN
- 1208                                                 QbeGen.ElemStore(qd, qn2,
- 1209                                                   dt)
- 1210                                               ELSE QbeGen.StoreVar(qn,
- 1211                                                 qn2, FALSE)
- 1212                                               END
- 1213                                             END; .) .
- 1214    (* NEW/DISPOSE as builtin statements (no call syntax until step 4).
- 1215       Targets are pointer designators; DISPOSE nils afterwards (safer
- 1216       than Wirth-undefined; documented). DISPOSE is shallow. *)
- 1217    NewStat                               (. VAR dt: SymTab.TypeIndex;
- 1218                                               dk: INTEGER;
- 1219                                               qd, qm: QbeGen.QVal;
- 1220                                               qn: SymTab.Name;
- 1221                                               sfx: BOOLEAN;
- 1222                                               bt: SymTab.TypeIndex;
- 1223                                               astNode, astD: AST.Node; .)
- 1224      = "NEW" "(" Design<dt, dk, qd, qn, sfx> (. astD := astCur; .) ")"
- 1225                                          (. astNode := AST.MakeNode(AST.NkCall);
- 1226                                             AST.SetChild(astNode, 0,
- 1227                                               AST.MakeLeaf(AST.NkIdent, "NEW"));
- 1228                                             IF astD # AST.NoNode THEN
- 1229                                               AST.SetChild(astNode, 1, astD) END;
- 1230                                             astStmt := astNode; .)
- 1231                                          (. IF dt = SymTab.InvalidType THEN
- 1232                                             ELSIF (dk # SymTab.KindVar)
- 1233   AND (dk # SymTab.KindParam)
- 1234   AND (dk # SymTab.KindField) THEN
- 1235                                               SemError(210)
- 1236                                             ELSIF SymTab.ClassOf(dt) #
- 1237                                                   SymTab.ClPtr THEN
- 1238                                               SemError(219)
- 1239                                             ELSE bt := SymTab.PtrBase(dt);
- 1240                                               IF bt #
- 1241                                                  SymTab.InvalidType THEN
- 1242                                                 QbeGen.NewHeap(bt, qm);
- 1243                                                 QbeGen.InitHeap(qm, bt);
- 1244                                                 IF sfx
- 1245                                                    OR (dk =
- 1246                                                       SymTab.KindField) THEN
- 1247                                                   QbeGen.ElemStore(qd, qm,
- 1248                                                     dt)
- 1249                                                 ELSE QbeGen.StorePtr(qn,
- 1250                                                   qm)
- 1251                                                 END
- 1252                                               END
- 1253                                             END; .) .
- 1254    DisposeStat                           (. VAR dt: SymTab.TypeIndex;
- 1255                                               dk: INTEGER;
- 1256                                               qd, qv: QbeGen.QVal;
- 1257                                               qn: SymTab.Name;
- 1258                                               sfx: BOOLEAN;
- 1259                                               astNode, astD: AST.Node; .)
- 1260      = "DISPOSE" "(" Design<dt, dk, qd, qn, sfx> (. astD := astCur; .) ")"
- 1261                                          (. astNode := AST.MakeNode(AST.NkCall);
- 1262                                             AST.SetChild(astNode, 0,
- 1263                                               AST.MakeLeaf(AST.NkIdent, "DISPOSE"));
- 1264                                             IF astD # AST.NoNode THEN
- 1265                                               AST.SetChild(astNode, 1, astD) END;
- 1266                                             astStmt := astNode; .)
- 1267                                          (. IF dt = SymTab.InvalidType THEN
- 1268                                             ELSIF (dk # SymTab.KindVar)
- 1269   AND (dk # SymTab.KindParam)
- 1270   AND (dk # SymTab.KindField) THEN
- 1271                                               SemError(210)
- 1272                                             ELSIF SymTab.ClassOf(dt) #
- 1273                                                   SymTab.ClPtr THEN
- 1274                                               SemError(219)
- 1275                                             ELSE
- 1276                                               IF sfx
- 1277                                                  OR (dk =
- 1278                                                     SymTab.KindField) THEN
- 1279                                                 QbeGen.ElemLoad(qd, dt,
- 1280                                                   qv)
- 1281                                               ELSE QbeGen.LoadPtr(qn, qv)
- 1282                                               END;
- 1283                                               QbeGen.FreeHeap(qv);
- 1284                                               IF sfx
- 1285                                                  OR (dk =
- 1286                                                     SymTab.KindField) THEN
- 1287                                                 QbeGen.ElemStore(qd, "0",
- 1288                                                   dt)
- 1289                                               ELSE QbeGen.StorePtr(qn,
- 1290                                                 "0")
- 1291                                               END
- 1292                                             END; .) .
- 1293    (* WITH pushes each record's fields (inner wins) plus its base
- 1294       address; field designators resolve through both stacks. *)
- 1295    WithStat                              (. VAR nW: CARDINAL;
- 1296                                               astNode: AST.Node; .)
- 1297      = "WITH"                            (. nW := 0;
- 1298                                             astNode := AST.MakeNode(AST.NkWith); .)
- 1299        WithItem<nW, astNode> { "," WithItem<nW, astNode> }
- 1300        "DO"                              (. astStmt := AST.NoNode; .)
- 1301        [ StatSeq ] "END"                 (. AST.SetChild(astNode,
- 1302                                             AST.NChild(astNode), astStmt);
- 1303                                             astStmt := astNode;
- 1304                                             WHILE nW > 0 DO
- 1305                                               SymTab.PopScope;
- 1306                                               QbeGen.PopWith;
- 1307                                               DEC(nW)
+  167  PROCEDURE AstAppend (kind: INTEGER; VAR head, tail: AST.Node;
+  168                       item: AST.Node);
+  169  (* Appends `item` to a chunked sequence: each node holds up to
+  170     AST.MaxChild-1 items; child[MaxChild-1] continues into the next
+  171     chunk.  Unbounded, so blocks/decl sequences are not capped at 8. *)
+  172    VAR n: AST.Node;
+  173    BEGIN
+  174      IF item = AST.NoNode THEN RETURN END;
+  175      IF head = AST.NoNode THEN
+  176        head := AST.MakeNode(kind); tail := head
+  177      END;
+  178      IF AST.NChild(tail) >= AST.MaxChild - 1 THEN
+  179        n := AST.MakeNode(kind);
+  180        AST.SetChild(tail, AST.MaxChild - 1, n);
+  181        tail := n
+  182      END;
+  183      AST.SetChild(tail, AST.NChild(tail), item)
+  184    END AstAppend;
+  185  
+  186  CHARACTERS
+  187    eol      = CHR(13) .
+  188    lf       = CHR(10) .
+  189    letter   = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" .
+  190    digit    = "0123456789" .
+  191    hexDigit = digit + "ABCDEFabcdef" .
+  192    noQuote1 = ANY - "'" - eol .
+  193    noQuote2 = ANY - '"' - eol .
+  194  
+  195  IGNORE CHR(9) .. CHR(13)
+  196  
+  197  COMMENTS FROM "(*" TO "*)" NESTED
+  198  COMMENTS FROM "//" TO lf
+  199  
+  200  TOKENS
+  201    ident   = letter { letter | digit } .
+  202    integer = digit { digit }
+  203            | digit { digit } CONTEXT("..")
+  204            | "0x" hexDigit { hexDigit }
+  205            | "0X" hexDigit { hexDigit } .
+  206    real    = digit { digit } "." { digit }
+  207              [ ( "E" | "e" ) [ "+" | "-" ] digit { digit } ] .
+  208    string  = "'" { noQuote1 } "'"
+  209            | '"' { noQuote2 } '"' .
+  210    charConst = digit { digit } ( "C" | "c" ) .
+  211    ustring = ( "U" | "u" ) ( "'" { noQuote1 } "'" | '"' { noQuote2 } '"' ) .
+  212  
+  213  PRODUCTIONS
+  214    M2
+  215      = (. AST.Init; twoPhase := TRUE; astCur := AST.NoNode; astStmt := AST.NoNode; astDecl := AST.NoNode; .)
+  216        Unit "." .
+  217    (* Units: program modules compile fully; DEFINITION and
+  218       IMPLEMENTATION modules parse + check now but lower in step 4
+  219       (each ends with one 230); same for nested local modules. *)
+  220    Unit
+  221      = DefUnit
+  222      | ImplUnit
+  223      | ProgModule .
+  224    (* Step 4.3: one session compiles DEFINITION, its IMPLEMENTATION
+  225       and one program (last) into one image. Units share the symbol
+  226       table; imports materialize exported names. *)
+  227    DefUnit                               (. VAR m1, m2, pn: SymTab.Name; .)
+  228      = "DEFINITION" "MODULE"
+  229        GetIdent<m1>                      (. IF NOT SymTab.BeginDef(m1) THEN
+  230                                               SemError(200) END;
+  231                                             QbeGen.SetModule(m1); .)
+  232        ";"
+  233        { Import }
+  234        [ "EXPORT" [ "QUALIFIED" ]        (. (* definition-module export
+  235                                                list: parsed, and the
+  236                                                names are already exported
+  237                                                by the module scope *) .)
+  238          GetIdent<pn> { "," GetIdent<pn> } ";" ]
+  239        { ConstBlock | TypeBlock<TRUE> | VarBlock
+  240        | ProcHeading<pn, SymTab.InvalidType> ";"
+  241                                          (. SymTab.CloseProc;
+  242                                               QbeGen.AbortFunc; .) }
+  243                                          (. astUnit := AST.MakeNode(AST.NkUnit);
+  244                                             AST.SetChild(astUnit, 0,
+  245                                               AST.MakeLeaf(AST.NkIdent, m1));
+  246                                             astDecl := AST.NoNode;
+  247                                             astStmt := AST.NoNode; .)
+  248        "END"
+  249        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
+  250                                               SemError(202) END;
+  251                                             SymTab.EndUnit; .) .
+  252    ImplUnit                              (. VAR m1, m2: SymTab.Name;
+  253                                               k: CARDINAL;
+  254                                               fname: SymTab.Name;
+  255                                               unres: BOOLEAN;
+  256                                               astNode: AST.Node; .)
+  257      = "IMPLEMENTATION" "MODULE"
+  258        GetIdent<m1> (. IF NOT SymTab.BeginImpl(m1) THEN
+  259                                               SemError(201) END;
+  260                                             astStmt := AST.NoNode;
+  261                                             astDecl := AST.NoNode;
+  262                                             nPendVar := 0;
+  263                                             QbeGen.SetModule(m1); .)
+  264        ";"
+  265        { Import }
+  266        DeclSeq
+  267        [ "BEGIN"                         (. FlushPend;
+  268                                             k := 0;
+  269                                             WHILE k < SymTab.FwdPending() DO
+  270                                               SymTab.FwdInfo(k, fname, unres);
+  271                                               IF unres THEN SemError(201) END;
+  272                                               INC(k)
+  273                                             END;
+  274                                             SymTab.FwdClear;
+  275                                             FwdVarFlush;
+  276                                             QbeGen.BeginInit(m1); .)
+  277          [ StatSeq ]                       (. QbeGen.EndInit; .) ]
+  278        "END"
+  279        GetIdent<m2>                      (. FlushPend;
+  280                                             k := 0;
+  281                                             WHILE k < SymTab.FwdPending() DO
+  282                                               SymTab.FwdInfo(k, fname, unres);
+  283                                               IF unres THEN SemError(201) END;
+  284                                               INC(k)
+  285                                             END;
+  286                                             SymTab.FwdClear;
+  287                                             FwdVarFlush;
+  288                                             astNode := AST.MakeNode(AST.NkUnit);
+  289                                             AST.SetChild(astNode, 0,
+  290                                               AST.MakeLeaf(AST.NkIdent, m1));
+  291                                             AST.SetChild(astNode, 1, astDecl);
+  292                                             AST.SetChild(astNode, 2, astStmt);
+  293                                             astUnit := astNode;
+  294                                             IF NOT SymTab.Equal(m1, m2) THEN
+  295                                               SemError(202) END;
+  296                                             SymTab.EndUnit; .) .
+  297    ProgModule                            (. VAR m1, m2: SymTab.Name;
+  298                                               k: CARDINAL;
+  299                                               fname: SymTab.Name;
+  300                                               unres: BOOLEAN;
+  301                                               astNode: AST.Node; .)
+  302      = "MODULE"
+  303        GetIdent<m1> (. IF NOT SymTab.BeginProg(m1) THEN
+  304                                               SemError(200) END;
+  305                                             astStmt := AST.NoNode;
+  306                                             astDecl := AST.NoNode;
+  307                                             nPendVar := 0;
+  308                                             QbeGen.SetModule(m1); .)
+  309        [ Priority ]
+  310        ";"
+  311        { Import }
+  312        DeclSeq
+  313        [ "BEGIN"                         (. FlushPend;
+  314                                             k := 0;
+  315                                             WHILE k < SymTab.FwdPending() DO
+  316                                               SymTab.FwdInfo(k, fname, unres);
+  317                                               IF unres THEN SemError(201) END;
+  318                                               INC(k)
+  319                                             END;
+  320                                             SymTab.FwdClear;
+  321                                             FwdVarFlush;
+  322                                             QbeGen.BeginBody; .)
+  323          [ StatSeq ] ]
+  324        "END"
+  325        GetIdent<m2>                      (. FlushPend;
+  326                                             k := 0;
+  327                                             WHILE k < SymTab.FwdPending() DO
+  328                                               SymTab.FwdInfo(k, fname, unres);
+  329                                               IF unres THEN SemError(201) END;
+  330                                               INC(k)
+  331                                             END;
+  332                                             SymTab.FwdClear;
+  333                                             FwdVarFlush;
+  334                                             IF NOT SymTab.Equal(m1, m2) THEN
+  335                                               SemError(202) END;
+  336                                             astNode := AST.MakeNode(AST.NkUnit);
+  337                                             AST.SetChild(astNode, 0,
+  338                                               AST.MakeLeaf(AST.NkIdent, m1));
+  339                                             AST.SetChild(astNode, 1, astDecl);
+  340                                             AST.SetChild(astNode, 2, astStmt);
+  341                                             astUnit := astNode;
+  342                                             QbeGen.EndModule(m1);
+  343                                             SymTab.EndUnit; .) .
+  344    DeclSeq                               (. VAR astSeq, astTail: AST.Node; .)
+  345      =                                   (. astSeq := AST.NoNode;
+  346                                             astTail := AST.NoNode; .)
+  347        { (. astDecl := AST.NoNode; .)
+  348          ( ConstBlock | TypeBlock<FALSE> | VarBlock | ProcDecl ";"
+  349          | NestedModule ";" | ClassItem ";" )
+  350                                          (. AstAppend(AST.NkDeclSeq,
+  351                                               astSeq, astTail, astDecl); .) }
+  352                                          (. astDecl := astSeq; .) .
+  353    (* Local module, Wirth form. Declarations lower like top-level ones
+  354       (same QBE module prefix); a BEGIN body becomes an init function
+  355       that main calls; the EXPORT list is hoisted into the enclosing
+  356       scope at END. *)
+  357    NestedModule                          (. VAR m1, m2: SymTab.Name;
+  358                                               expNames: ARRAY [0 .. 63] OF SymTab.Name;
+  359                                               expCount, k: CARDINAL; .)
+  360      = "MODULE"
+  361        GetIdent<m1>                      (. IF NOT SymTab.Enter(m1,
+  362                                               SymTab.KindModule) THEN
+  363                                               SemError(200) END;
+  364                                             SymTab.PushScope;
+  365                                             expCount := 0; .)
+  366        [ Priority ]
+  367        ";"
+  368        { Import }
+  369        [ "EXPORT" [ "QUALIFIED" ]
+  370          GetIdent<expNames[expCount]>    (. INC(expCount); .)
+  371          { "," GetIdent<expNames[expCount]>
+  372                                          (. INC(expCount); .) }
+  373          ";" ]
+  374        DeclSeq
+  375        [ "BEGIN"                         (. QbeGen.BeginInit(m1); .)
+  376          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
+  377        "END"
+  378        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
+  379                                               SemError(202) END;
+  380                                             k := 0;
+  381                                             WHILE k < expCount DO
+  382                                               SymTab.ExportUp(expNames[k]);
+  383                                               INC(k)
+  384                                             END;
+  385                                             SymTab.PopScope; .) .
+  386    Priority
+  387      = "[" integer "]"                   (. SemError(230); .) .
+  388    (* Imports (4.3): FROM materializes the names (unqualified use);
+  389       plain IMPORT only demands the module exists — qualified `L.x`
+  390       materializes on first use (Design). *)
+  391    (* Unknown modules stay unchecked stubs (legacy, so hand-written
+  392       import lines don't fail); a known module's missing export is
+  393       201. *)
+  394    Import                                (. VAR n: SymTab.Name; .)
+  395      = "FROM"
+  396        GetIdent<n>
+  397        "IMPORT"
+  398        ImpList<n> ";"
+  399      | "IMPORT"
+  400        ImpModList ";" .
+  401    ImpList<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
+  402      = ImpName<mod>
+  403        { "," ImpName<mod> } .
+  404    (* Pervasive built-ins imported from SYSTEM (e.g. TSIZE) are
+  405       accepted and ignored: the built-in applies regardless. *)
+  406    ImpName<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
+  407      = GetIdent<n>                       (. IF SymTab.Equal(mod, "libc") THEN
+  408                                               (* intrinsic C library:
+  409                                                  permissive external *)
+  410                                               IF NOT SymTab.DeclareCProc(n) THEN
+  411                                                 SemError(201) END
+  412                                             ELSIF SymTab.ModKnown(mod)
+  413                                               AND NOT SymTab.ImportFrom(mod, n) THEN
+  414                                               SemError(201) END; .)
+  415      | ( "TSIZE" | "SIZE" | "ADR" | "HIGH" | "LEN"
+  416        | "CHR" | "ORD" | "ORDL" | "VAL" | "ABS" | "CAP"
+  417        | "UCHR" | "CHR8" | "UORD"
+  418        | "INC" | "DEC" ) .
+  419    ImpModList                            (. VAR n: SymTab.Name; .)
+  420      = GetIdent<n>
+  421        { "," GetIdent<n> } .
+  422    (* Opaque TYPE declarations (definition modules). The targetless
+  423       alias resolves to InvalidType until step 4 completes it. *)
+  424    (* Scalar-phase TYPEs: named types, integer subranges, enumerations.
+  425       Opaque "TYPE T;" needs isDef (definition units); elsewhere 231.
+  426       Composite forms (ARRAY/RECORD/SET/POINTER) arrive with step 3. *)
+  427    TypeBlock<isDef: BOOLEAN>
+  428      = "TYPE"                            (. SymTab.BeginTypeBlock; .)
+  429        { TypeItem<isDef> ";" | ClassItem ";" }
+  430                                          (. SymTab.EndTypeBlock; .) .
+  431    TypeItem<isDef: BOOLEAN>              (. VAR n: SymTab.Name;
+  432                                               t, op: SymTab.TypeIndex;
+  433                                               astNode: AST.Node; .)
+  434      = GetIdent<n>                       (. op := SymTab.OpaqueBase(n);
+  435                                             IF op = SymTab.InvalidType THEN
+  436                                               IF NOT SymTab.Enter(n,
+  437                                                  SymTab.KindType) THEN
+  438                                                 SemError(200) END
+  439                                             END; .)
+  440        ( "=" Type<t, FALSE> (. astNode := AST.MakeNode(AST.NkTypeDecl);
+  441                                               AST.SetChild(astNode, 0,
+  442                                                 AST.MakeLeaf(AST.NkIdent, n));
+  443                                               AST.SetTy(astNode, t);
+  444                                               astDecl := astNode;
+  445                                               IF op # SymTab.InvalidType THEN
+  446                                               SymTab.SetTarget(op, t)
+  447                                             ELSE SymTab.SetSymType(n, t)
+  448                                             END; .)
+  449        |                                 (. IF op # SymTab.InvalidType THEN
+  450                                               (* stays opaque *)
+  451                                             ELSIF NOT isDef THEN
+  452                                               SemError(231)
+  453                                             ELSE SymTab.SetSymType(n,
+  454                                               SymTab.NewAlias()) END; .) ) .
+  455    Type<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
+  456      = TypeIdent<t> [ Subrange<t> ]     (* anchored subrange: T[lo..hi] *)
+  457      | Subrange<t>
+  458      | Enum<t>
+  459      | ArrayType<t, allowOpen>
+  460      | SetType<t>
+  461      | RecordType<t>
+  462      | PointerType<t>
+  463      | ProcType<t> .
+  464    PointerType<VAR t: SymTab.TypeIndex>  (. VAR base: SymTab.TypeIndex; .)
+  465      = "POINTER" "TO" Type<base, FALSE>(. t := SymTab.NewPtr(base); .) .
+  466    (* Procedure types (step 8.5): PROCEDURE (params): result. Values
+  467       are code pointers; params are collected into the descriptor. *)
+  468    ProcType<VAR t: SymTab.TypeIndex>     (. VAR res, pt: SymTab.TypeIndex;
+  469                                               isV: BOOLEAN; .)
+  470      = "PROCEDURE"                       (. res := SymTab.InvalidType;
+  471                                             t := SymTab.NewProcType(res); .)
+  472        [ "(" [ ProcTypeSection<t> { ";" ProcTypeSection<t> } ] ")" ]
+  473        [ ":" TypeIdent<res>              (. SymTab.SetProcTypeRes(t, res); .) ] .
+  474    ProcTypeSection<t: SymTab.TypeIndex>  (. VAR pt: SymTab.TypeIndex;
+  475                                               isV: BOOLEAN;
+  476                                               cnt, k: CARDINAL;
+  477                                               names: ARRAY [0 .. 15] OF SymTab.Name; .)
+  478      =                                   (. isV := FALSE; cnt := 0; .)
+  479        [ "VAR"                           (. isV := TRUE; .) ]
+  480        ( GetIdent<names[cnt]>            (. INC(cnt); .)
+  481          { "," GetIdent<names[cnt]>      (. INC(cnt); .) }
+  482          ( ":" Type<pt, TRUE>           (. k := 0;
+  483                                             WHILE k < cnt DO
+  484                                               SymTab.ProcTypeAdd(t, isV, pt);
+  485                                               INC(k)
+  486                                             END; .)
+  487          |                               (. (* type-only parameter list:
+  488                                                each name is a type (GNU
+  489                                                shorthand used by the
+  490                                                Coco/R scanner frame) *)
+  491                                             k := 0;
+  492                                             WHILE k < cnt DO
+  493                                               IF SymTab.Lookup(names[k])
+  494                                                  AND ((SymTab.SymKind(names[k]) = SymTab.KindType)
+  495    OR (SymTab.SymKind(names[k]) = SymTab.KindPredef)) THEN
+  496                                                 pt := SymTab.SymType(names[k])
+  497                                               ELSE SemError(201);
+  498                                                 pt := SymTab.InvalidType
+  499                                               END;
+  500                                               SymTab.ProcTypeAdd(t, isV, pt);
+  501                                               INC(k)
+  502                                             END; .) )
+  503        | Type<pt, TRUE>                 (. (* unnamed parameter (PIM):
+  504                                                e.g. PROCEDURE (VAR ARRAY OF REAL) *)
+  505                                             SymTab.ProcTypeAdd(t, isV, pt); .) ) .
+  506    (* Arrays: "OF" without bounds is an open formal (allowed only
+  507       where allowOpen); "[lo..hi, ...]" nests bounded levels inside
+  508       out. Bounds are folded literals (int/char); anything else 230.
+  509       Bare-type indices ("ARRAY Color OF") wait for enum ordinals. *)
+  510    ArrayType<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
+  511                                          (. VAR elem: SymTab.TypeIndex;
+  512                                               ok: BOOLEAN;
+  513                                               bnds, bndh: ARRAY [0 .. 7] OF INTEGER;
+  514                                               nb, k: CARDINAL;
+  515                                               idx: SymTab.TypeIndex;
+  516                                               ilo, ihi: INTEGER; .)
+  517      = "ARRAY"
+  518        ( "OF" Type<elem, FALSE>          (. IF NOT allowOpen THEN
+  519                                               SemError(230) END;
+  520                                             t := SymTab.NewOpenArray(elem); .)
+  521        | TypeIdent<idx> [ Subrange<idx> ]
+  522          "OF" Type<elem, FALSE>          (. (* index-type array: the index
+  523                                                type's ordinal bounds give the
+  524                                                [lo..hi] pair *)
+  525                                             IF SymTab.TypeBounds(idx, ilo,
+  526                                                ihi)
+  527                                             THEN t := SymTab.NewArrayB(elem,
+  528                                                    ilo, ihi)
+  529                                             ELSE SemError(230);
+  530                                               t := SymTab.InvalidType
+  531                                             END; .)
+  532        | "["                             (. SymTab.BoundBegin; ok := TRUE; .)
+  533          BoundPair<ok>
+  534          { "," BoundPair<ok> }
+  535          "]"                             (. (* snapshot before the element
+  536                                                type, which reuses the bound
+  537                                                buffer for a nested ARRAY *)
+  538                                             nb := SymTab.BoundCount();
+  539                                             k := 0;
+  540                                             WHILE k < nb DO
+  541                                               bnds[k] := SymTab.BoundLo(k);
+  542                                               bndh[k] := SymTab.BoundHi(k);
+  543                                               INC(k)
+  544                                             END; .)
+  545          "OF" Type<elem, FALSE>
+  546                                          (. IF ok THEN
+  547                                               k := nb;
+  548                                               WHILE k > 0 DO
+  549                                                 DEC(k);
+  550                                                 elem := SymTab.NewArrayB(
+  551                                                   elem, bnds[k], bndh[k])
+  552                                               END;
+  553                                               t := elem
+  554                                             ELSE t := SymTab.InvalidType
+  555                                             END; .) ) .
+  556    BoundPair<VAR ok: BOOLEAN>            (. VAR tlo, thi: SymTab.TypeIndex;
+  557                                               qlo, qhi: QbeGen.QVal;
+  558                                               lo, hi: INTEGER;
+  559                                               cl, cl2: INTEGER; .)
+  560      = Expr<tlo, qlo> ".." Expr<thi, qhi>
+  561                                          (. IF (tlo = SymTab.InvalidType)
+  562                                              OR (thi = SymTab.InvalidType) THEN
+  563                                             ok := FALSE
+  564                                           ELSE cl := SymTab.ClassOf(tlo);
+  565                                             cl2 := SymTab.ClassOf(thi);
+  566                                             IF ((cl # SymTab.ClInt)
+  567   AND (cl # SymTab.ClChar))
+  568                                                OR ((cl2 # SymTab.ClInt)
+  569   AND (cl2 # SymTab.ClChar)) THEN
+  570                                               SemError(230); ok := FALSE
+  571                                             ELSIF NOT SymTab.ConstInt(qlo, lo)
+  572                                                OR NOT SymTab.ConstInt(qhi, hi)
+  573                                                OR (lo > hi) THEN
+  574                                               SemError(230); ok := FALSE
+  575                                              ELSIF NOT SymTab.BoundAdd(lo, hi) THEN
+  576                                                SemError(230); ok := FALSE
+  577                                              END;
+  578                                            END; .) .
+  579    (* Sets: multi-word masks over bases ≤ 256 values (bool, char,
+  580       bounded subranges; enums wait for ordinals, INTEGER is
+  581       unbounded). Literals are SET OF [0..255]; assignment and
+  582       comparison across suitable bases are lenient (masks over min
+  583       words + zero-check extras), out-of-span literals are 222. *)
+  584    SetType<VAR t: SymTab.TypeIndex>      (. VAR base: SymTab.TypeIndex;
+  585                                               blo, bhi, bspan: INTEGER;
+  586                                               bcls: INTEGER; .)
+  587      = "SET" "OF" Type<base, FALSE>
+  588                                          (. IF base = SymTab.InvalidType THEN
+  589                                               t := SymTab.InvalidType
+  590                                             ELSE bcls :=
+  591                                                    SymTab.ClassOf(base);
+  592                                               IF bcls = SymTab.ClBool THEN
+  593                                                 blo := 0; bspan := 2
+  594                                               ELSIF bcls = SymTab.ClChar THEN
+  595                                                 blo := 0; bspan := 256
+  596                                               ELSIF bcls = SymTab.ClEnum THEN
+  597                                                 blo := 0;
+  598                                                 bspan := VAL(INTEGER,
+  599                                                   SymTab.EnumCount(base))
+  600                                               ELSIF SymTab.SubBounds(base,
+  601                                                       blo, bhi) THEN
+  602                                                 bspan := bhi - blo + 1
+  603                                               ELSE bspan := 0 END;
+  604                                               IF (bspan <= 0)
+  605                                                  OR (bspan > 65536) THEN
+  606                                                 SemError(230);
+  607                                                 t := SymTab.InvalidType
+  608                                               ELSE t := SymTab.NewSet(base)
+  609                                               END
+  610                                             END; .) .
+  611    (* Records: flat blobs; array fields are pointers to static
+  612       descriptors (locked amendment), nested records inline. Field
+  613       offsets static and declaration-ordered. *)
+  614    (* Field list: plain fields and (optionally) one variant part.  The
+  615       variant part is a `CASE ... END` item; because it starts with the
+  616       CASE keyword it is unambiguously distinguishable from a field
+  617       (which starts with an identifier). *)
+  618    RecordType<VAR t: SymTab.TypeIndex>   (. VAR t2: SymTab.TypeIndex;
+  619                                               tagOk: BOOLEAN; .)
+  620      = "RECORD"                          (. t := SymTab.NewRecord(); .)
+  621        [ RecItem<t> { ";" [ RecItem<t> ] } ]
+  622        "END" .
+  623    RecItem<rec: SymTab.TypeIndex>        (. VAR tt: SymTab.TypeIndex; .)
+  624      = RecField<rec>
+  625      | CaseField<rec>                    (. SymTab.MarkVariant(rec); .) .
+  626    (* A variant part: CASE tag : Type OF variants.  The layout overlays
+  627       every branch from the tag slot (see SymTab.ComputeOffsets). *)
+  628    CaseField<rec: SymTab.TypeIndex>      (. VAR tagT: SymTab.TypeIndex;
+  629                                               tagN: SymTab.Name; .)
+  630      = "CASE"                            (. SymTab.ResetFields(rec); .)
+  631        GetIdent<tagN>                    (. IF NOT SymTab.FieldPending(rec,
+  632                                               tagN) THEN
+  633                                               SemError(200) END; .)
+  634        ":" Type<tagT, FALSE>             (. IF (tagT # SymTab.InvalidType)
+  635    AND NOT SymTab.IsOrdinal(tagT) THEN
+  636                                               SemError(224)
+  637                                             END;
+  638                                             SymTab.FixPendingF(rec, tagT);
+  639                                             SymTab.SetVariantTag(rec, tagN); .)
+  640        "OF"
+  641        RecFieldList<rec>
+  642        { "|"                             (. SymTab.ResetFields(rec); .)
+  643          RecFieldList<rec> }
+  644        "END" .
+  645    RecFieldList<rec: SymTab.TypeIndex>   (. VAR lt, lq: SymTab.TypeIndex;
+  646                                               lv1, lv2: QbeGen.QVal; .)
+  647      = VarLabel<lt, lv1> [ ".." VarLabel<lq, lv2> ] ":"
+  648        RecField<rec> { ";" [ RecField<rec> ] } .
+  649    (* Variant case label: a constant (or a constant range).  Values are
+  650       not interpreted (the layout overlays regardless). *)
+  651    VarLabel<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+  652                                          (. VAR lname: SymTab.Name; .)
+  653      = ( ident                         (. LexName(lname);
+  654                                             QbeGen.CopyOp("0", q);
+  655                                             t := SymTab.IntType(); .)
+  656        | integer                       (. LexString(lname);
+  657                                             QbeGen.CopyOp("0", q);
+  658                                             t := SymTab.IntType(); .)
+  659        | charConst                     (. LexString(lname);
+  660                                             QbeGen.CopyOp("0", q);
+  661                                             t := SymTab.CharType(); .) ) .
+  662    RecField<rec: SymTab.TypeIndex>       (. VAR n: SymTab.Name;
+  663                                               t2: SymTab.TypeIndex; .)
+  664      = RecIdents<rec> ":" Type<t2, FALSE>(. SymTab.FixPendingF(rec, t2); .) .
+  665    RecIdents<rec: SymTab.TypeIndex>      (. VAR n: SymTab.Name; .)
+  666      = GetIdent<n>                       (. IF NOT SymTab.FieldPending(rec,
+  667                                               n) THEN
+  668                                               SemError(200) END; .)
+  669        { "," GetIdent<n>                 (. IF NOT SymTab.FieldPending(rec,
+  670                                               n) THEN
+  671                                               SemError(200) END; .) } .
+  672    TypeIdent<VAR t: SymTab.TypeIndex>    (. VAR n, qid: SymTab.Name;
+  673                                               k: INTEGER;
+  674                                               dotted: BOOLEAN; .)
+  675      = GetIdent<n>                       (. dotted := FALSE;
+  676                                             IF NOT SymTab.Lookup(n) THEN
+  677                                               k := -1;
+  678                                               t := SymTab.ForwardType(n);
+  679                                               IF t = SymTab.InvalidType THEN
+  680                                                 SemError(201)
+  681                                               END
+  682                                             ELSE k := SymTab.SymKind(n);
+  683                                               IF (k = SymTab.KindType)
+  684                                                  OR (k = SymTab.KindPredef) THEN
+  685                                                 t := SymTab.SymType(n)
+  686                                               ELSE t := SymTab.InvalidType
+  687                                               END
+  688                                             END; .)
+  689        [ "." GetIdent<qid>               (. dotted := TRUE;
+  690                                             IF k = SymTab.KindModule THEN
+  691                                               t := SymTab.QualType(n, qid);
+  692                                               IF t = SymTab.InvalidType THEN
+  693                                                 SemError(201)
+  694                                               END
+  695                                             ELSE SemError(221);
+  696                                               t := SymTab.InvalidType
+  697                                             END; .) ]
+  698                                          (. IF NOT dotted THEN
+  699                                               IF (k = SymTab.KindModule)
+  700                                                  OR ((k # SymTab.KindType)
+  701    AND (k # SymTab.KindPredef)
+  702    AND (k # SymTab.KindImport)
+  703    AND (k # -1)) THEN
+  704                                                 SemError(221)
+  705                                               END
+  706                                             END; .) .
+  707    Subrange<VAR t: SymTab.TypeIndex>     (. VAR tlo, thi: SymTab.TypeIndex;
+  708                                               qlo, qhi: QbeGen.QVal;
+  709                                               lo, hi: INTEGER; .)
+  710      = "[" Expr<tlo, qlo> ".." Expr<thi, qhi>
+  711                                          (. IF (tlo = SymTab.InvalidType)
+  712                                              OR (thi = SymTab.InvalidType) THEN
+  713                                             t := SymTab.InvalidType
+  714                                           ELSIF NOT SymTab.IsOrdinal(tlo)
+  715                                              OR NOT SymTab.IsOrdinal(thi) THEN
+  716                                             SemError(230);
+  717                                             t := SymTab.InvalidType
+  718                                           ELSIF NOT SymTab.ConstInt(qlo, lo)
+  719                                              OR NOT SymTab.ConstInt(qhi, hi)
+  720                                              OR (lo > hi) THEN
+  721                                             SemError(230);
+  722                                             t := SymTab.InvalidType
+  723                                           ELSE t := SymTab.NewSubR(lo, hi)
+  724                                           END; .)
+  725        "]" .
+  726    Enum<VAR t: SymTab.TypeIndex>         (. VAR n: SymTab.Name;
+  727                                               ord: INTEGER;
+  728                                               qv: QbeGen.QVal; .)
+  729      = "("                               (. t := SymTab.NewEnum();
+  730                                             ord := 0; .)
+  731        GetIdent<n>                       (. IF NOT SymTab.Enter(n,
+  732                                               SymTab.KindConst) THEN
+  733                                               SemError(200) END;
+  734                                             SymTab.SetSymType(n, t);
+  735                                             QbeGen.IntStr(ord, qv);
+  736                                             SymTab.SetSymVal(n, qv);
+  737                                             INC(ord); .)
+  738        { "," GetIdent<n>                 (. IF NOT SymTab.Enter(n,
+  739                                               SymTab.KindConst) THEN
+  740                                               SemError(200) END;
+  741                                             SymTab.SetSymType(n, t);
+  742                                             QbeGen.IntStr(ord, qv);
+  743                                             SymTab.SetSymVal(n, qv);
+  744                                             INC(ord); .) }
+  745        ")"                               (. SymTab.SetEnumCount(t,
+  746                                               VAL(CARDINAL, ord)); .) .
+  747    (* Clarion-form classes (docs/OOP.txt): declaration + single
+  748       inheritance + IMPLEMENTATION blocks. Scopes and member checks
+  749       now; lowering (vtable, dispatch, THIS) later — one 230 per
+  750       class/impl block. Methods end with ";" per the Table example
+  751       (not "," as in the sketch). No underscores in identifiers. *)
+  752    (* Single CLASS item in both loops: separating declaration from
+  753       IMPLEMENTATION at the loop level needs 2-token lookahead
+  754       (CLASS ident vs CLASS IMPLEMENTATION), which LL(1) cannot do.
+  755       The second token decides after CLASS is consumed. A misplaced
+  756       CLASS IMPLEMENTATION inside TYPE still parses (harmless: the
+  757       whole unit ends 230 until lowering). *)
+  758    ClassItem
+  759      = "CLASS" ( "IMPLEMENTATION" ClassImplRest | ClassRest ) .
+  760    ClassRest                             (. VAR cn, m2, pn: SymTab.Name;
+  761                                               ct: SymTab.TypeIndex; .)
+  762      = GetIdent<cn>                      (. IF NOT SymTab.Enter(cn,
+  763                                               SymTab.KindType) THEN
+  764                                               SemError(200) END;
+  765                                             ct := SymTab.NewClass();
+  766                                             SymTab.SetSymType(cn, ct);
+  767                                             SymTab.PushClassScope(ct); .)
+  768        [ Parents<ct> ]
+  769        ";"
+  770        { ClassField<ct> ";" }
+  771        { MethodHeading<pn, SymTab.InvalidType> ";"
+  772                                          (. SymTab.CloseProc;
+  773                                             QbeGen.AbortFunc; .) }
+  774        "END"
+  775        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
+  776                                               SemError(202) END;
+  777                                             SymTab.LayoutClass(ct);
+  778                                             SymTab.PopScope; .) .
+  779    Parents<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name; .)
+  780      = "(" Parent1<ct>
+  781        { "," GetIdent<p>                 (. SemError(230); .) }
+  782        ")" .
+  783    Parent1<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name;
+  784                                               pt: SymTab.TypeIndex; .)
+  785      = GetIdent<p>                       (. IF NOT SymTab.Lookup(p) THEN
+  786                                               SemError(201)
+  787                                             ELSE pt := SymTab.SymType(p);
+  788                                               IF SymTab.ClassOf(pt) #
+  789                                                  SymTab.ClClass THEN
+  790                                                 SemError(230)
+  791                                               ELSE SymTab.SetParent(ct, pt)
+  792                                               END
+  793                                             END; .) .
+  794    ClassField<ct: SymTab.TypeIndex>      (. VAR n, rhs: SymTab.Name;
+  795                                               t: SymTab.TypeIndex; .)
+  796      = GetIdent<n>
+  797        ( "=" GetIdent<rhs>               (. IF NOT SymTab.Enter(n,
+  798                                               SymTab.KindConst) THEN
+  799                                               SemError(200) END;
+  800                                             IF SymTab.Lookup(rhs) THEN
+  801                                               SymTab.SetSymType(n,
+  802                                                 SymTab.SymType(rhs))
+  803                                             END; .)
+  804        |                                 (. IF NOT SymTab.FieldPending(ct,
+  805                                               n) THEN
+  806                                               SemError(200) END; .)
+  807          { "," GetIdent<n>               (. IF NOT SymTab.FieldPending(ct,
+  808                                               n) THEN
+  809                                               SemError(200) END; .) }
+  810          ":" Type<t, FALSE>              (. SymTab.FixPendingF(ct, t); .) ) .
+  811    MethodHeading<VAR pn: SymTab.Name; ct: SymTab.TypeIndex>
+  812                                          (. VAR wantVirt: BOOLEAN; .)
+  813      =                                   (. wantVirt := FALSE; .)
+  814        [ "VIRTUAL"                       (. wantVirt := TRUE; .) ]
+  815        ProcHeading<pn, ct>               (. IF wantVirt THEN
+  816                                               SymTab.MarkVirtual END; .) .
+  817    ClassImplRest                         (. VAR cn, m2: SymTab.Name;
+  818                                               ct: SymTab.TypeIndex; .)
+  819      = GetIdent<cn>                      (. IF NOT SymTab.Lookup(cn) THEN
+  820                                               SemError(201);
+  821                                               ct := SymTab.InvalidType
+  822                                             ELSE ct := SymTab.SymType(cn);
+  823                                               IF SymTab.ClassOf(ct) #
+  824                                                  SymTab.ClClass THEN
+  825                                                 SemError(230);
+  826                                                 ct := SymTab.InvalidType
+  827                                               END
+  828                                             END;
+  829                                             IF ct #
+  830                                                SymTab.InvalidType THEN
+  831                                               IF NOT SymTab.PushClassMembers(
+  832                                                      ct) THEN
+  833                                                 SemError(230) END;
+  834                                               SymTab.PushImplClass(ct)
+  835                                             END; .)
+  836        ";" { MethodImpl<ct> ";" }
+  837        [ "BEGIN"                         (. QbeGen.BeginInit(cn); .)
+  838          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
+  839        "END"
+  840        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
+  841                                               SemError(202) END;
+  842                                             SymTab.PopImplClass;
+  843                                             SymTab.PopScope; .) .
+  844    MethodImpl<ct: SymTab.TypeIndex>      (. VAR pn: SymTab.Name;
+  845                                               thisQ: QbeGen.QVal;
+  846                                               methRes: SymTab.TypeIndex; .)
+  847      = MethodHeading<pn, ct> ";"
+  848                                          (. IF (ct #
+  849                                                SymTab.InvalidType)
+  850   AND NOT SymTab.MethodExists(ct,
+  851                                                    pn) THEN
+  852                                               SemError(201) END; .)
+  853        ( "FORWARD"                       (. SymTab.MarkFwd;
+  854                                             QbeGen.AbortFunc;
+  855                                             SymTab.CloseProc; .)
+  856        |                                 (. QbeGen.EndFuncHeader;
+  857                                             (* bind the receiver: bare
+  858                                                field names resolve
+  859                                                against THIS *)
+  860                                             QbeGen.ThisBase(thisQ);
+  861                                             QbeGen.PushWith(thisQ); .)
+  862          Block<pn>                       (. QbeGen.PopWith;
+  863                                             methRes := SymTab.CurRes();
+  864                                             SymTab.CloseProc;
+  865                                             QbeGen.EndFunc(methRes); .) ) .
+  866    ConstBlock                            (. VAR astSeq, astTail: AST.Node; .)
+  867      = "CONST"                           (. astSeq := AST.NoNode;
+  868                                             astTail := AST.NoNode; .)
+  869        { ConstDecl ";"                   (. AstAppend(AST.NkDeclSeq,
+  870                                               astSeq, astTail, astDecl); .) }
+  871                                          (. astDecl := astSeq; .) .
+  872    ConstDecl                             (. VAR n: SymTab.Name;
+  873                                               t: SymTab.TypeIndex;
+  874                                               qv: QbeGen.QVal;
+  875                                               cls: INTEGER;
+  876                                               astNode: AST.Node; .)
+  877      = GetIdent<n>                       (. IF NOT SymTab.Enter(n,
+  878                                               SymTab.KindConst) THEN
+  879                                               SemError(200) END; .)
+  880        "="
+  881        Expr<t, qv> (. astNode := AST.MakeNode(AST.NkConstDecl);
+  882                                             AST.SetChild(astNode, 0,
+  883                                               AST.MakeLeaf(AST.NkIdent, n));
+  884                                             AST.SetChild(astNode, 1, astCur);
+  885                                             AST.SetTy(astNode, t);
+  886                                             astDecl := astNode;
+  887                                             SymTab.SetSymType(n, t);
+  888                                             cls := SymTab.ClassOf(t);
+  889                                             IF (cls = SymTab.ClArray)
+  890                                                OR (cls = SymTab.ClRecord)
+  891                                                OR (cls = SymTab.ClClass)
+  892                                                OR (cls = SymTab.ClStr)
+  893                                                OR (cls = SymTab.ClUStr) THEN
+  894                                               (* an aggregate/string
+  895                                                  constant: qv is its
+  896                                                  descriptor address; no
+  897                                                  scalar data *)
+  898                                               SymTab.SetSymVal(n, qv)
+  899                                             ELSIF NOT QbeGen.IsImm(qv) THEN
+  900                                               SemError(230)
+  901                                             ELSE
+  902                                               SymTab.SetSymVal(n, qv);
+  903                                               QbeGen.DeclConst(n, qv, t)
+  904                                             END; .) .
+  905    VarBlock                              (. VAR astSeq, astTail: AST.Node; .)
+  906      = "VAR"                             (. astSeq := AST.NoNode;
+  907                                             astTail := AST.NoNode; .)
+  908        { VarDecl ";"                     (. AstAppend(AST.NkDeclSeq,
+  909                                               astSeq, astTail, astDecl); .) }
+  910                                          (. astDecl := astSeq; .) .
+  911    VarDecl                               (. VAR nm: SymTab.Name;
+  912                                               t: SymTab.TypeIndex;
+  913                                               i: CARDINAL;
+  914                                               cls: INTEGER;
+  915                                               astNode: AST.Node; .)
+  916      = VarIdents ":"
+  917        Type<t, FALSE> (. astNode := AST.MakeNode(AST.NkVarDecl);
+  918                                             i := 0;
+  919                                             WHILE i < SymTab.PendCount() DO
+  920                                               SymTab.PendName(i, nm);
+  921                                               AST.SetChild(astNode,
+  922                                                 AST.NChild(astNode),
+  923                                                 AST.MakeLeaf(AST.NkIdent, nm));
+  924                                               INC(i)
+  925                                             END;
+  926                                             AST.SetTy(astNode, t);
+  927                                             astDecl := astNode;
+  928                                             cls := SymTab.ClassOf(t);
+  929                                             IF (t # SymTab.InvalidType)
+  930   AND NOT SymTab.IsUnresolved(t)
+  931   AND (cls # SymTab.ClInt)
+  932   AND (cls # SymTab.ClBool)
+  933   AND (cls # SymTab.ClChar)
+  934   AND (cls # SymTab.ClReal)
+  935   AND (cls # SymTab.ClArray)
+  936   AND (cls # SymTab.ClSet)
+  937   AND (cls # SymTab.ClRecord)
+  938   AND (cls # SymTab.ClPtr)
+  939   AND (cls # SymTab.ClLong)
+  940   AND (cls # SymTab.ClProc)
+  941   AND (cls # SymTab.ClUChar)
+  942   AND (cls # SymTab.ClUStr)
+  943   AND (cls # SymTab.ClEnum)
+  944   AND (cls # SymTab.ClClass) THEN
+  945                                               SemError(230) END;
+  946                                             IF QbeGen.LocFull() THEN
+  947                                               SemError(233) END;
+  948                                             i := 0;
+  949                                             IF SymTab.IsUnresolved(t)
+  950                                                AND NOT SymTab.InProc() THEN
+  951                                               (* a forward-typed global:
+  952                                                  defer emission until the
+  953                                                  TYPE block completes *)
+  954                                               WHILE i < SymTab.PendCount() DO
+  955                                                 SymTab.PendName(i, nm);
+  956                                                 IF nPendVar <=
+  957                                                    HIGH(pendVarName) THEN
+  958                                                   pendVarName[nPendVar] := nm;
+  959                                                   pendVarT[nPendVar] := t;
+  960                                                   INC(nPendVar)
+  961                                                 END;
+  962                                                 INC(i)
+  963                                               END
+  964                                             ELSE
+  965                                               WHILE i < SymTab.PendCount() DO
+  966                                                 SymTab.PendName(i, nm);
+  967                                                 QbeGen.DeclVar(nm, t);
+  968                                                 INC(i)
+  969                                               END
+  970                                             END;
+  971                                             (* a plain VAR list, not a
+  972                                                heading: the signature
+  973                                                result is discarded *)
+  974                                             IF NOT SymTab.FixPending(t) THEN
+  975                                             END; .) .
+  976    VarIdents                             (. VAR n: SymTab.Name; .)
+  977      = GetIdent<n>                       (. IF NOT SymTab.EnterPending(n,
+  978                                               SymTab.KindVar) THEN
+  979                                               SemError(200) END; .)
+  980        { ","
+  981          GetIdent<n>                     (. IF NOT SymTab.EnterPending(n,
+  982                                               SymTab.KindVar) THEN
+  983                                               SemError(200) END; .) } .
+  984    ParIdents<isV: BOOLEAN>               (. VAR n: SymTab.Name; .)
+  985      = GetIdent<n>                       (. IF NOT SymTab.EnterParam(n, isV) THEN
+  986                                               SemError(200) END; .)
+  987        { "," GetIdent<n>                 (. IF NOT SymTab.EnterParam(n, isV) THEN
+  988                                               SemError(200) END; .) } .
+  989    (* Procedure headings enter scopes/params/result and buffer the
+  990       QBE header; bodies lower to functions (4.1, module level only).
+  991       FORWARD marks; the body heading re-enters (signature compare
+  992       deferred). Nested procedures parse + check, lowering = 4.2. *)
+  993    ProcHeading<VAR pn: SymTab.Name; methCls: SymTab.TypeIndex>
+  994                                          (. VAR t: SymTab.TypeIndex;
+  995                                               mg: QbeGen.QVal; .)
+  996      = "PROCEDURE"
+  997        GetIdent<pn>                      (. IF methCls #
+  998                                                SymTab.InvalidType THEN
+  999                                             (* a method: resume the
+ 1000                                                declared symbol (reuse
+ 1001                                                its uid) *)
+ 1002                                             IF NOT SymTab.ResumeMethod(
+ 1003                                                  methCls, pn) THEN
+ 1004                                               SemError(200) END
+ 1005                                             ELSIF NOT SymTab.EnterProc(pn) THEN
+ 1006                                             IF NOT SymTab.ReenterProc(pn) THEN
+ 1007                                               IF NOT SymTab.ResumeProc(pn) THEN
+ 1008                                                 SemError(200) END
+ 1009                                               END
+ 1010                                             END;
+ 1011                                             IF methCls #
+ 1012                                                SymTab.InvalidType THEN
+ 1013                                               QbeGen.Mangled(pn,
+ 1014                                                 SymTab.MethUid(), mg)
+ 1015                                             ELSE
+ 1016                                               QbeGen.Mangled(pn,
+ 1017                                                 SymTab.ProcUid(pn), mg)
+ 1018                                             END;
+ 1019                                             QbeGen.BeginFunc(mg);
+ 1020                                             IF methCls #
+ 1021                                                SymTab.InvalidType THEN
+ 1022                                               (* hidden THIS receiver:
+ 1023                                                  a VAR param of the
+ 1024                                                  class type, pushed as
+ 1025                                                  the WITH base *)
+ 1026                                               IF NOT SymTab.EnterThisParam(
+ 1027                                                    methCls) THEN
+ 1028                                                 SemError(200) END;
+ 1029                                               IF NOT QbeGen.FuncParam(
+ 1030                                                    "THIS", TRUE,
+ 1031                                                    methCls) THEN
+ 1032                                                 SemError(233) END
+ 1033                                             END; .)
+ 1034        [ FormalParams ]
+ 1035        [ ":" TypeIdent<t>                (. IF NOT SymTab.SetProcRes(t) THEN
+ 1036                                               SemError(235) END;
+ 1037                                             QbeGen.SetFuncRes(t);
+ 1038                                             IF (t #
+ 1039                                                SymTab.InvalidType)
+ 1040   AND ((SymTab.ClassOf(t)
+ 1041                                                   = SymTab.ClArray)
+ 1042                                                OR (SymTab.ClassOf(t)
+ 1043                                                   = SymTab.ClRecord)
+ 1044                                                OR (SymTab.ClassOf(t)
+ 1045                                                   = SymTab.ClSet)
+ 1046                                                OR (SymTab.ClassOf(t)
+ 1047                                                   = SymTab.ClClass)) THEN
+ 1048                                               SemError(230) END; .) ] .
+ 1049    FormalParams
+ 1050      = "(" [ ParamSection { ";" ParamSection } ] ")" .
+ 1051    ParamSection                          (. VAR t: SymTab.TypeIndex;
+ 1052                                               nm: SymTab.Name;
+ 1053                                               i: CARDINAL;
+ 1054                                               isV: BOOLEAN; .)
+ 1055      =                                   (. isV := FALSE; .)
+ 1056        [ "VAR"                           (. isV := TRUE; .) ]
+ 1057        ParIdents<isV> ":" Type<t, TRUE>  (. i := 0;
+ 1058                                             WHILE i < SymTab.PendCount() DO
+ 1059                                               SymTab.PendName(i, nm);
+ 1060                                               (* value open arrays are
+ 1061                                                  passed as descriptor
+ 1062                                                  addresses (no copy):
+ 1063                                                  same representation as
+ 1064                                                  VAR formals *)
+ 1065                                               IF NOT QbeGen.FuncParam(nm,
+ 1066                                                    isV
+ 1067                                                    OR SymTab.IsOpenArray(t),
+ 1068                                                    t) THEN
+ 1069                                                 SemError(233) END;
+ 1070                                               INC(i)
+ 1071                                             END;
+ 1072                                             IF NOT SymTab.FixPending(t) THEN
+ 1073                                               SemError(235) END; .) .
+ 1074    (* Nested procedures lower like top-level ones (4.2): the
+ 1075       static link gives them their parent's frame. Methods keep
+ 1076       parse-now/230-later. *)
+ 1077    ProcDecl                              (. VAR pn: SymTab.Name;
+ 1078                                               astNode: AST.Node; .)
+ 1079      = ProcHeading<pn, SymTab.InvalidType> ";"
+ 1080                                          (. astNode := AST.MakeNode(AST.NkProcDecl);
+ 1081                                             AST.SetChild(astNode, 0,
+ 1082                                               AST.MakeLeaf(AST.NkIdent, pn)); .)
+ 1083        ( "FORWARD"                       (. AST.SetOp(astNode, 1);
+ 1084                                             astDecl := astNode;
+ 1085                                             SymTab.MarkFwd;
+ 1086                                             SymTab.CloseProc;
+ 1087                                             QbeGen.AbortFunc; .)
+ 1088        | "EXTERNAL"                      (. AST.SetOp(astNode, 2);
+ 1089                                             astDecl := astNode;
+ 1090                                             SymTab.MarkExternal("");
+ 1091                                             SymTab.CloseProc;
+ 1092                                             QbeGen.AbortFunc; .)
+ 1093        |                                 (. QbeGen.EndFuncHeader; .)
+ 1094          Block<pn>                       (. AST.SetChild(astNode, 1, astStmt);
+ 1095                                             astDecl := astNode;
+ 1096                                             SymTab.CloseProc;
+ 1097                                             QbeGen.EndFunc(
+ 1098                                               SymTab.ProcRes(pn)); .) ) .
+ 1099    Block<pn: SymTab.Name>                (. VAR m2: SymTab.Name; .)
+ 1100      = DeclSeq                           (. astStmt := AST.NoNode; .)
+ 1101        [ "BEGIN"
+ 1102          [ StatSeq ] ]
+ 1103        "END"
+ 1104        GetIdent<m2>                      (. IF NOT SymTab.Equal(pn, m2) THEN
+ 1105                                               SemError(202) END; .) .
+ 1106    StatSeq                               (. VAR astSeq, astTail: AST.Node; .)
+ 1107      =                                   (. astSeq := AST.NoNode;
+ 1108                                             astTail := AST.NoNode; .)
+ 1109        Statement                         (. AstAppend(AST.NkBlock,
+ 1110                                               astSeq, astTail, astStmt); .)
+ 1111        { ";" [ Statement                 (. AstAppend(AST.NkBlock,
+ 1112                                               astSeq, astTail, astStmt); .) ] }
+ 1113                                          (. astStmt := astSeq; .) .
+ 1114    (* Trailing/empty statements (`a; ; b`, Coco/R's generated `;;`)
+ 1115       are accepted: the statement after ';' is optional. *)
+ 1116    Statement                             (. VAR lx: QbeGen.QVal; .)
+ 1117      = (. astStmt := AST.NoNode; .)
+ 1118        ( AssOrCall
+ 1119      | IfStat
+ 1120      | WhileStat
+ 1121      | RepeatStat
+ 1122      | LoopStat
+ 1123      | ForStat
+ 1124      | CaseStat
+ 1125      | WithStat
+ 1126      | ReturnStat
+ 1127      | HaltStat
+ 1128      | NewStat
+ 1129      | DisposeStat
+ 1130      | IncDecStat
+ 1131      | InclExclStat
+ 1132      | "EXIT"                            (. IF QbeGen.TopLoop(lx) THEN
+ 1133                                               QbeGen.Jmp(lx)
+ 1134                                             ELSE SemError(230) END;
+ 1135                                             astStmt := AST.MakeNode(AST.NkExit); .) ) .
+ 1136    (* INCL(set, elem) / EXCL(set, elem): PIM set-element builtins. *)
+ 1137    InclExclStat                          (. VAR at, et2: SymTab.TypeIndex;
+ 1138                                               dk: INTEGER;
+ 1139                                               qd, qe: QbeGen.QVal;
+ 1140                                               qn: SymTab.Name;
+ 1141                                               sfx, isInc: BOOLEAN;
+ 1142                                               astNode, astD: AST.Node; .)
+ 1143      = ( "INCL"                          (. isInc := TRUE; .)
+ 1144        | "EXCL"                          (. isInc := FALSE; .) )
+ 1145        "(" Design<at, dk, qd, qn, sfx> (. astD := astCur; .) ","
+ 1146        Expr<et2, qe> ")"
+ 1147                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 1148                                             IF isInc THEN
+ 1149                                               AST.SetChild(astNode, 0,
+ 1150                                                 AST.MakeLeaf(AST.NkIdent, "INCL"))
+ 1151                                             ELSE AST.SetChild(astNode, 0,
+ 1152                                                 AST.MakeLeaf(AST.NkIdent, "EXCL"))
+ 1153                                             END;
+ 1154                                             IF astD # AST.NoNode THEN
+ 1155                                               AST.SetChild(astNode, 1, astD) END;
+ 1156                                             IF astCur # AST.NoNode THEN
+ 1157                                               AST.SetChild(astNode, 2, astCur) END;
+ 1158                                             astStmt := astNode; .)
+ 1159                                          (. IF at = SymTab.InvalidType THEN
+ 1160                                             ELSIF SymTab.ClassOf(at) #
+ 1161                                                   SymTab.ClSet THEN
+ 1162                                               SemError(222)
+ 1163                                             ELSE
+ 1164                                               IF isInc THEN
+ 1165                                                 QbeGen.SetBit(qd, qe,
+ 1166                                                   SymTab.SetBaseLo(at),
+ 1167                                                   SymTab.SetCount(at))
+ 1168                                               ELSE
+ 1169                                                 QbeGen.SetClearBit(qd, qe,
+ 1170                                                   SymTab.SetBaseLo(at),
+ 1171                                                   SymTab.SetCount(at))
+ 1172                                               END
+ 1173                                             END; .) .
+ 1174    (* INC(v [,step]) / DEC(v [,step]) as builtin statements over an
+ 1175       integer designator. *)
+ 1176    IncDecStat                            (. VAR dt, et2: SymTab.TypeIndex;
+ 1177                                               dk: INTEGER;
+ 1178                                               qd, qv, qn2, qstep:
+ 1179                                                 QbeGen.QVal;
+ 1180                                               qn: SymTab.Name;
+ 1181                                               sfx, isInc: BOOLEAN;
+ 1182                                               astNode, astD, astStep:
+ 1183                                                 AST.Node; .)
+ 1184      =                                   (. isInc := TRUE; .)
+ 1185        ( "INC"                           (. isInc := TRUE; .)
+ 1186        | "DEC"                           (. isInc := FALSE; .) )
+ 1187        "("                               (. QbeGen.CopyOp("1", qstep); astStep := AST.NoNode; .)
+ 1188        Design<dt, dk, qd, qn, sfx> (. astD := astCur; .)
+ 1189        [ "," Expr<et2, qstep> (. astStep := astCur; .) ]
+ 1190        ")"                               (. astNode := AST.MakeNode(AST.NkCall);
+ 1191                                             IF isInc THEN
+ 1192                                               AST.SetChild(astNode, 0,
+ 1193                                                 AST.MakeLeaf(AST.NkIdent, "INC"))
+ 1194                                             ELSE AST.SetChild(astNode, 0,
+ 1195                                                 AST.MakeLeaf(AST.NkIdent, "DEC"))
+ 1196                                             END;
+ 1197                                             IF astD # AST.NoNode THEN
+ 1198                                               AST.SetChild(astNode, 1, astD) END;
+ 1199                                             IF astStep # AST.NoNode THEN
+ 1200                                               AST.SetChild(astNode, 2, astStep) END;
+ 1201                                             astStmt := astNode; .)                               (. IF dt = SymTab.InvalidType THEN
+ 1202                                             ELSIF (dk # SymTab.KindVar)
+ 1203   AND (dk # SymTab.KindParam)
+ 1204   AND (dk # SymTab.KindField) THEN
+ 1205                                               SemError(210)
+ 1206                                             ELSIF NOT SymTab.IsIntFamily(dt) THEN
+ 1207                                               SemError(211)
+ 1208                                             ELSE
+ 1209                                               IF sfx
+ 1210                                                  OR (dk = SymTab.KindField) THEN
+ 1211                                                 QbeGen.ElemLoad(qd, dt, qv)
+ 1212                                               ELSE QbeGen.LoadVar(qn,
+ 1213                                                 FALSE, qv)
+ 1214                                               END;
+ 1215                                               QbeGen.NewTemp(qn2);
+ 1216                                               IF isInc THEN
+ 1217                                                 QbeGen.Op3("add", qn2, qv,
+ 1218                                                   qstep, FALSE)
+ 1219                                               ELSE QbeGen.Op3("sub", qn2, qv,
+ 1220                                                   qstep, FALSE)
+ 1221                                               END;
+ 1222                                               IF sfx
+ 1223                                                  OR (dk = SymTab.KindField) THEN
+ 1224                                                 QbeGen.ElemStore(qd, qn2,
+ 1225                                                   dt)
+ 1226                                               ELSE QbeGen.StoreVar(qn,
+ 1227                                                 qn2, FALSE)
+ 1228                                               END
+ 1229                                             END; .) .
+ 1230    (* NEW/DISPOSE as builtin statements (no call syntax until step 4).
+ 1231       Targets are pointer designators; DISPOSE nils afterwards (safer
+ 1232       than Wirth-undefined; documented). DISPOSE is shallow. *)
+ 1233    NewStat                               (. VAR dt: SymTab.TypeIndex;
+ 1234                                               dk: INTEGER;
+ 1235                                               qd, qm: QbeGen.QVal;
+ 1236                                               qn: SymTab.Name;
+ 1237                                               sfx: BOOLEAN;
+ 1238                                               bt: SymTab.TypeIndex;
+ 1239                                               astNode, astD: AST.Node; .)
+ 1240      = "NEW" "(" Design<dt, dk, qd, qn, sfx> (. astD := astCur; .) ")"
+ 1241                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 1242                                             AST.SetChild(astNode, 0,
+ 1243                                               AST.MakeLeaf(AST.NkIdent, "NEW"));
+ 1244                                             IF astD # AST.NoNode THEN
+ 1245                                               AST.SetChild(astNode, 1, astD) END;
+ 1246                                             astStmt := astNode; .)
+ 1247                                          (. IF dt = SymTab.InvalidType THEN
+ 1248                                             ELSIF (dk # SymTab.KindVar)
+ 1249   AND (dk # SymTab.KindParam)
+ 1250   AND (dk # SymTab.KindField) THEN
+ 1251                                               SemError(210)
+ 1252                                             ELSIF SymTab.ClassOf(dt) #
+ 1253                                                   SymTab.ClPtr THEN
+ 1254                                               SemError(219)
+ 1255                                             ELSE bt := SymTab.PtrBase(dt);
+ 1256                                               IF bt #
+ 1257                                                  SymTab.InvalidType THEN
+ 1258                                                 QbeGen.NewHeap(bt, qm);
+ 1259                                                 QbeGen.InitHeap(qm, bt);
+ 1260                                                 IF sfx
+ 1261                                                    OR (dk =
+ 1262                                                       SymTab.KindField) THEN
+ 1263                                                   QbeGen.ElemStore(qd, qm,
+ 1264                                                     dt)
+ 1265                                                 ELSE QbeGen.StorePtr(qn,
+ 1266                                                   qm)
+ 1267                                                 END
+ 1268                                               END
+ 1269                                             END; .) .
+ 1270    DisposeStat                           (. VAR dt: SymTab.TypeIndex;
+ 1271                                               dk: INTEGER;
+ 1272                                               qd, qv: QbeGen.QVal;
+ 1273                                               qn: SymTab.Name;
+ 1274                                               sfx: BOOLEAN;
+ 1275                                               astNode, astD: AST.Node; .)
+ 1276      = "DISPOSE" "(" Design<dt, dk, qd, qn, sfx> (. astD := astCur; .) ")"
+ 1277                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 1278                                             AST.SetChild(astNode, 0,
+ 1279                                               AST.MakeLeaf(AST.NkIdent, "DISPOSE"));
+ 1280                                             IF astD # AST.NoNode THEN
+ 1281                                               AST.SetChild(astNode, 1, astD) END;
+ 1282                                             astStmt := astNode; .)
+ 1283                                          (. IF dt = SymTab.InvalidType THEN
+ 1284                                             ELSIF (dk # SymTab.KindVar)
+ 1285   AND (dk # SymTab.KindParam)
+ 1286   AND (dk # SymTab.KindField) THEN
+ 1287                                               SemError(210)
+ 1288                                             ELSIF SymTab.ClassOf(dt) #
+ 1289                                                   SymTab.ClPtr THEN
+ 1290                                               SemError(219)
+ 1291                                             ELSE
+ 1292                                               IF sfx
+ 1293                                                  OR (dk =
+ 1294                                                     SymTab.KindField) THEN
+ 1295                                                 QbeGen.ElemLoad(qd, dt,
+ 1296                                                   qv)
+ 1297                                               ELSE QbeGen.LoadPtr(qn, qv)
+ 1298                                               END;
+ 1299                                               QbeGen.FreeHeap(qv);
+ 1300                                               IF sfx
+ 1301                                                  OR (dk =
+ 1302                                                     SymTab.KindField) THEN
+ 1303                                                 QbeGen.ElemStore(qd, "0",
+ 1304                                                   dt)
+ 1305                                               ELSE QbeGen.StorePtr(qn,
+ 1306                                                 "0")
+ 1307                                               END
  1308                                             END; .) .
- 1309    WithItem<VAR nW: CARDINAL; wnode: AST.Node>
- 1310                                          (. VAR dt: SymTab.TypeIndex;
- 1311                                               dk: INTEGER;
- 1312                                               qd, qe: QbeGen.QVal;
- 1313                                               qn: SymTab.Name;
- 1314                                               sfx: BOOLEAN; .)
- 1315      = Design<dt, dk, qd, qn, sfx>
- 1316                                          (. IF astCur # AST.NoNode THEN
- 1317                                               AST.SetChild(wnode,
- 1318                                                 AST.NChild(wnode), astCur) END;
- 1319                                             IF dt = SymTab.InvalidType THEN
- 1320                                             ELSIF (SymTab.ClassOf(dt) #
- 1321                                                    SymTab.ClRecord)
- 1322   AND (SymTab.ClassOf(dt) #
- 1323                                                   SymTab.ClClass) THEN
- 1324                                               SemError(215)
- 1325                                             ELSIF SymTab.PushRecord(dt) THEN
- 1326                                               QbeGen.PushWith(qd);
- 1327                                               INC(nW)
- 1328                                             END; .) .
- 1329    (* Assignment or procedure-statement call (4.1, module level).
- 1330       Bare `P;` is a syntax error; function-as-statement is 233. *)
- 1331    AssOrCall                             (. VAR dt, et: SymTab.TypeIndex;
- 1332                                               dk: INTEGER;
- 1333                                               qd, qe, qt, ql: QbeGen.QVal;
- 1334                                               qn: SymTab.Name;
- 1335                                               ct2, res0: SymTab.TypeIndex;
- 1336                                               q2, mg0: QbeGen.QVal;
- 1337                                               isR, conv, wconv: BOOLEAN;
- 1338                                               called, sfx: BOOLEAN;
- 1339                                               astLhs: AST.Node; .)
- 1340      = Design<dt, dk, qd, qn, sfx>
- 1341        (. astLhs := astCur; astNArgs := 0; .)
- 1342        ( ":="
- 1343          Expr<et, qe>                    (. astStmt := AST.MakeBin(
- 1344                                               AST.NkAssign, 0, astLhs, astCur);
- 1345                                             IF (dt # SymTab.InvalidType)
- 1346   AND (dk # SymTab.KindVar)
- 1347   AND (dk # SymTab.KindParam)
- 1348   AND (dk # SymTab.KindField) THEN
- 1349                                             SemError(210)
- 1350                                           ELSIF NOT SymTab.Assignable(et,
- 1351                                                    dt) THEN
- 1352                                             SemError(210)
- 1353                                           ELSIF (dt # SymTab.InvalidType)
- 1354   AND (SymTab.ClassOf(dt) =
- 1355                                                 SymTab.ClClass) THEN
- 1356                                             SemError(230) END;
- 1357                                           isR := (dt #
- 1358                                                   SymTab.InvalidType)
- 1359   AND (SymTab.ClassOf(dt)
- 1360                                                     = SymTab.ClReal);
- 1361                                           conv := isR
- 1362   AND SymTab.IsIntFamily(et);
- 1363                                           wconv := (dt #
- 1364                                                     SymTab.InvalidType)
- 1365   AND SymTab.IsLongFamily(dt)
- 1366   AND SymTab.IsIntFamily(et);
- 1367                                           IF ((dk = SymTab.KindVar)
- 1368                                               OR (dk = SymTab.KindParam)
- 1369                                               OR (dk = SymTab.KindField))
- 1370   AND (dt # SymTab.InvalidType)
- 1371   AND (et # SymTab.InvalidType)
- 1372   AND (SymTab.ClassOf(dt) #
- 1373                                                 SymTab.ClClass) THEN
- 1374                                             IF sfx
- 1375                                                OR (dk = SymTab.KindField) THEN
- 1376                                               IF SymTab.ClassOf(dt) =
- 1377                                                  SymTab.ClArray THEN
- 1378                                                 IF (et # SymTab.InvalidType)
- 1379    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
- 1380    AND SymTab.IsUCharArray(dt) THEN
- 1381                                                   QbeGen.UAssign(qd, qe)
- 1382                                                 ELSIF SymTab.StrCompat(dt,
- 1383                                                      et) THEN
- 1384                                                   QbeGen.StrAssign(qd,
- 1385                                                     qe)
- 1386                                                 ELSE
- 1387                                                   QbeGen.CopyArray(qd,
- 1388                                                     qe, dt)
- 1389                                                 END
- 1390                                               ELSIF SymTab.ClassOf(dt) =
- 1391                                                   SymTab.ClSet THEN
- 1392                                                 QbeGen.CopySet(qd, qe,
- 1393                                                   SymTab.SetWords(dt),
- 1394                                                   SymTab.SetWords(et))
- 1395                                               ELSIF SymTab.ClassOf(dt) =
- 1396                                                   SymTab.ClRecord THEN
- 1397                                                 QbeGen.CopyRecord(qd, qe,
- 1398                                                   dt)
- 1399                                               ELSIF SymTab.IsLongFamily(dt) THEN
- 1400                                                 IF wconv THEN
- 1401                                                   QbeGen.WidenLong(qe, ql);
- 1402                                                   QbeGen.ElemStore(qd, ql,
- 1403                                                     dt)
- 1404                                                 ELSE QbeGen.ElemStore(qd, qe,
- 1405                                                   dt)
- 1406                                                 END
- 1407                                               ELSIF conv THEN
- 1408                                                 QbeGen.ConvIR(qe, qt);
- 1409                                                 QbeGen.ElemStore(qd, qt,
- 1410                                                   dt)
- 1411                                               ELSE QbeGen.ElemStore(qd, qe,
- 1412                                                 dt)
- 1413                                               END
- 1414                                             ELSIF SymTab.ClassOf(dt) =
- 1415                                                   SymTab.ClArray THEN
- 1416                                               IF (et # SymTab.InvalidType)
- 1417    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
- 1418    AND SymTab.IsUCharArray(dt) THEN
- 1419                                                 QbeGen.UAssign(qd, qe)
- 1420                                               ELSIF SymTab.StrCompat(dt,
- 1421                                                    et) THEN
- 1422                                                 QbeGen.StrAssign(qd, qe)
- 1423                                               ELSE
- 1424                                                 QbeGen.CopyArray(qd, qe,
- 1425                                                   dt)
- 1426                                               END
- 1427                                             ELSIF SymTab.ClassOf(dt) =
- 1428                                                   SymTab.ClSet THEN
- 1429                                               QbeGen.CopySet(qd, qe,
- 1430                                                 SymTab.SetWords(dt),
- 1431                                                 SymTab.SetWords(et))
- 1432                                             ELSIF SymTab.ClassOf(dt) =
- 1433                                                   SymTab.ClRecord THEN
- 1434                                               QbeGen.CopyRecord(qd, qe, dt)
- 1435                                             ELSIF (SymTab.ClassOf(dt) =
- 1436                                                   SymTab.ClPtr)
- 1437                                                OR (SymTab.ClassOf(dt) =
- 1438                                                   SymTab.ClProc) THEN
- 1439                                               QbeGen.StorePtr(qn, qe)
- 1440                                             ELSIF SymTab.IsLongFamily(dt) THEN
- 1441                                               IF wconv THEN
- 1442                                                 QbeGen.WidenLong(qe, ql);
- 1443                                                 QbeGen.StoreLong(qn, ql)
- 1444                                               ELSE QbeGen.StoreLong(qn, qe)
- 1445                                               END
- 1446                                             ELSIF conv THEN
- 1447                                               QbeGen.ConvIR(qe, qt);
- 1448                                               QbeGen.StoreVar(qn, qt, TRUE)
- 1449                                             ELSE
- 1450                                               QbeGen.StoreVar(qn, qe, isR)
- 1451                                             END
- 1452                                           END; .)
- 1453        | ArgList<qn, dt, qd, FALSE, FALSE, methCls, ct2, q2, called>
- 1454                                          (. astStmt := AstCallNode(astLhs); .)
- 1455        |                                 (* bare `P;`: proper parameterless
- 1456                                              procedure call; anything else
- 1457                                              here is 233 (was a bare syntax
- 1458                                              error before 4.2) *)
- 1459                                          (. astStmt := AstCallNode(astLhs);
- 1460                                              IF (dk = SymTab.KindProc)
- 1461   AND NOT sfx THEN
- 1462                                               res0 := SymTab.ProcRes(qn);
- 1463                                               IF res0 #
- 1464                                                  SymTab.InvalidType THEN
- 1465                                                 SemError(233)
- 1466                                               ELSIF SymTab.ProcNPar(qn) #
- 1467                                                       0 THEN
- 1468                                                 SemError(233)
- 1469                                               ELSE QbeGen.Mangled(qn,
- 1470                                                 SymTab.ProcUid(qn), mg0);
- 1471                                                 QbeGen.CallBegin(mg0,
- 1472                                                   res0,
- 1473                                                   SymTab.ProcDepthOf(qn),
- 1474                                                   SymTab.IsExternal(qn));
- 1475                                                 QbeGen.CallEnd(FALSE, q2)
- 1476                                               END
- 1477                                             ELSE SemError(233)
- 1478                                             END; .) ) .
- 1479    (* Actual-parameter list shared by statement and expression calls.
- 1480       want selects CallEnd's result handling; t/q carry the call
- 1481       value (statement calls discard). Arity/type failures are 233;
- 1482       evaluation code still emits so the .ssa stays assembleable. *)
- 1483    ArgList<pn: SymTab.Name; pt: SymTab.TypeIndex; callee: QbeGen.QVal;
- 1484            want: BOOLEAN; soft: BOOLEAN; methCls: SymTab.TypeIndex;
- 1485            VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
- 1486            VAR called: BOOLEAN>          (. VAR i, np: CARDINAL;
- 1487                                               vs: INTEGER;
- 1488                                               res: SymTab.TypeIndex;
- 1489                                               mg: QbeGen.QVal;
- 1490                                               ok, ind, isMeth, va: BOOLEAN; .)
- 1491      = "("                               (. called := TRUE;
- 1492                                             ok := TRUE;
- 1493                                             ind := FALSE;
- 1494                                             isMeth := methCls #
- 1495                                               SymTab.InvalidType;
- 1496                                             IF isMeth THEN
- 1497                                               (* class method: the
- 1498                                                  receiver is armed.
- 1499                                                  Virtual -> dispatch
- 1500                                                  through the vtable;
- 1501                                                  otherwise a static
- 1502                                                  call. *)
- 1503                                               res := SymTab.ClassMethodRes(
- 1504                                                 methCls, pn);
- 1505                                               vs := SymTab.VirtSlot(
- 1506                                                 methCls, pn);
- 1507                                               IF vs >= 0 THEN
- 1508                                                 QbeGen.VirtCallBegin(
- 1509                                                   callee, vs, res)
- 1510                                               ELSE
- 1511                                                 QbeGen.Mangled(pn,
- 1512                                                   SymTab.ClassMethodUid(
- 1513                                                   methCls, pn), mg);
- 1514                                                 QbeGen.CallBegin(mg, res, 0,
- 1515                                                   FALSE)
- 1516                                               END
- 1517                                             ELSIF SymTab.SymKind(pn) =
- 1518                                                SymTab.KindProc THEN
- 1519                                               res := SymTab.ProcRes(pn);
- 1520                                               QbeGen.Mangled(pn,
- 1521                                                 SymTab.ProcUid(pn), mg);
- 1522                                               QbeGen.CallBegin(mg, res,
- 1523                                                 SymTab.ProcDepthOf(pn),
- 1524                                                 SymTab.IsExternal(pn))
- 1525                                             ELSIF (pt # SymTab.InvalidType)
- 1526    AND (SymTab.ClassOf(pt) = SymTab.ClProc) THEN
- 1527                                               ind := TRUE;
- 1528                                               res :=
- 1529                                                 SymTab.ProcTypeRes(pt);
- 1530                                               QbeGen.CallBeginInd(callee,
- 1531                                                 res, FALSE)
- 1532                                             ELSE SemError(233);
- 1533                                               ok := FALSE;
- 1534                                               res := SymTab.InvalidType
- 1535                                             END;
- 1536                                             i := 0; .)
- 1537        [ ActParam<pn, pt, ind, methCls, i>        (. INC(i); .)
- 1538          { "," ActParam<pn, pt, ind, methCls, i>  (. INC(i); .) } ]
- 1539        ")"                               (. IF ok THEN
- 1540                                               IF isMeth THEN
- 1541                                                 np := SymTab.ClassMethodNPar(
- 1542                                                   methCls, pn)
- 1543                                               ELSIF ind THEN
- 1544                                                 np := SymTab.ProcTypeNPar(pt)
- 1545                                               ELSE np := SymTab.ProcNPar(pn)
- 1546                                               END;
- 1547                                               va := (NOT isMeth) AND (NOT ind)
- 1548                                                 AND (SymTab.SymKind(pn) =
- 1549                                                      SymTab.KindProc)
- 1550                                                 AND SymTab.Varargs(pn);
- 1551                                               IF (i # np) AND NOT va THEN
- 1552                                                 SemError(233); ok := FALSE
- 1553                                               END
- 1554                                             END;
- 1555                                             IF NOT ok THEN
- 1556                                               t := SymTab.InvalidType;
- 1557                                               QbeGen.CopyOp("0", q)
- 1558                                             ELSIF want THEN
- 1559                                               IF res =
- 1560                                                  SymTab.InvalidType THEN
- 1561                                                 SemError(233);
- 1562                                                 t := SymTab.InvalidType;
- 1563                                                 QbeGen.CopyOp("0", q)
- 1564                                               ELSE t := res;
- 1565                                                 QbeGen.CallEnd(TRUE, q)
- 1566                                               END
- 1567                                             ELSE
- 1568                                               IF res #
- 1569                                                  SymTab.InvalidType THEN
- 1570                                                 SemError(233)
- 1571                                               END;
+ 1309    (* WITH pushes each record's fields (inner wins) plus its base
+ 1310       address; field designators resolve through both stacks. *)
+ 1311    WithStat                              (. VAR nW: CARDINAL;
+ 1312                                               astNode: AST.Node; .)
+ 1313      = "WITH"                            (. nW := 0;
+ 1314                                             astNode := AST.MakeNode(AST.NkWith); .)
+ 1315        WithItem<nW, astNode> { "," WithItem<nW, astNode> }
+ 1316        "DO"                              (. astStmt := AST.NoNode; .)
+ 1317        [ StatSeq ] "END"                 (. AST.SetChild(astNode,
+ 1318                                             AST.NChild(astNode), astStmt);
+ 1319                                             astStmt := astNode;
+ 1320                                             WHILE nW > 0 DO
+ 1321                                               SymTab.PopScope;
+ 1322                                               QbeGen.PopWith;
+ 1323                                               DEC(nW)
+ 1324                                             END; .) .
+ 1325    WithItem<VAR nW: CARDINAL; wnode: AST.Node>
+ 1326                                          (. VAR dt: SymTab.TypeIndex;
+ 1327                                               dk: INTEGER;
+ 1328                                               qd, qe: QbeGen.QVal;
+ 1329                                               qn: SymTab.Name;
+ 1330                                               sfx: BOOLEAN; .)
+ 1331      = Design<dt, dk, qd, qn, sfx>
+ 1332                                          (. IF astCur # AST.NoNode THEN
+ 1333                                               AST.SetChild(wnode,
+ 1334                                                 AST.NChild(wnode), astCur) END;
+ 1335                                             IF dt = SymTab.InvalidType THEN
+ 1336                                             ELSIF (SymTab.ClassOf(dt) #
+ 1337                                                    SymTab.ClRecord)
+ 1338   AND (SymTab.ClassOf(dt) #
+ 1339                                                   SymTab.ClClass) THEN
+ 1340                                               SemError(215)
+ 1341                                             ELSIF SymTab.PushRecord(dt) THEN
+ 1342                                               QbeGen.PushWith(qd);
+ 1343                                               INC(nW)
+ 1344                                             END; .) .
+ 1345    (* Assignment or procedure-statement call (4.1, module level).
+ 1346       Bare `P;` is a syntax error; function-as-statement is 233. *)
+ 1347    AssOrCall                             (. VAR dt, et: SymTab.TypeIndex;
+ 1348                                               dk: INTEGER;
+ 1349                                               qd, qe, qt, ql: QbeGen.QVal;
+ 1350                                               qn: SymTab.Name;
+ 1351                                               ct2, res0: SymTab.TypeIndex;
+ 1352                                               q2, mg0: QbeGen.QVal;
+ 1353                                               isR, conv, wconv: BOOLEAN;
+ 1354                                               called, sfx: BOOLEAN;
+ 1355                                               astLhs: AST.Node; .)
+ 1356      = Design<dt, dk, qd, qn, sfx>
+ 1357        (. astLhs := astCur; astNArgs := 0; .)
+ 1358        ( ":="
+ 1359          Expr<et, qe>                    (. astStmt := AST.MakeBin(
+ 1360                                               AST.NkAssign, 0, astLhs, astCur);
+ 1361                                             IF (dt # SymTab.InvalidType)
+ 1362   AND (dk # SymTab.KindVar)
+ 1363   AND (dk # SymTab.KindParam)
+ 1364   AND (dk # SymTab.KindField) THEN
+ 1365                                             SemError(210)
+ 1366                                           ELSIF NOT SymTab.Assignable(et,
+ 1367                                                    dt) THEN
+ 1368                                             SemError(210)
+ 1369                                           ELSIF (dt # SymTab.InvalidType)
+ 1370   AND (SymTab.ClassOf(dt) =
+ 1371                                                 SymTab.ClClass) THEN
+ 1372                                             SemError(230) END;
+ 1373                                           isR := (dt #
+ 1374                                                   SymTab.InvalidType)
+ 1375   AND (SymTab.ClassOf(dt)
+ 1376                                                     = SymTab.ClReal);
+ 1377                                           conv := isR
+ 1378   AND SymTab.IsIntFamily(et);
+ 1379                                           wconv := (dt #
+ 1380                                                     SymTab.InvalidType)
+ 1381   AND SymTab.IsLongFamily(dt)
+ 1382   AND SymTab.IsIntFamily(et);
+ 1383                                           IF ((dk = SymTab.KindVar)
+ 1384                                               OR (dk = SymTab.KindParam)
+ 1385                                               OR (dk = SymTab.KindField))
+ 1386   AND (dt # SymTab.InvalidType)
+ 1387   AND (et # SymTab.InvalidType)
+ 1388   AND (SymTab.ClassOf(dt) #
+ 1389                                                 SymTab.ClClass) THEN
+ 1390                                             IF sfx
+ 1391                                                OR (dk = SymTab.KindField) THEN
+ 1392                                               IF SymTab.ClassOf(dt) =
+ 1393                                                  SymTab.ClArray THEN
+ 1394                                                 IF (et # SymTab.InvalidType)
+ 1395    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
+ 1396    AND SymTab.IsUCharArray(dt) THEN
+ 1397                                                   QbeGen.UAssign(qd, qe)
+ 1398                                                 ELSIF SymTab.StrCompat(dt,
+ 1399                                                      et) THEN
+ 1400                                                   QbeGen.StrAssign(qd,
+ 1401                                                     qe)
+ 1402                                                 ELSE
+ 1403                                                   QbeGen.CopyArray(qd,
+ 1404                                                     qe, dt)
+ 1405                                                 END
+ 1406                                               ELSIF SymTab.ClassOf(dt) =
+ 1407                                                   SymTab.ClSet THEN
+ 1408                                                 QbeGen.CopySet(qd, qe,
+ 1409                                                   SymTab.SetWords(dt),
+ 1410                                                   SymTab.SetWords(et))
+ 1411                                               ELSIF SymTab.ClassOf(dt) =
+ 1412                                                   SymTab.ClRecord THEN
+ 1413                                                 QbeGen.CopyRecord(qd, qe,
+ 1414                                                   dt)
+ 1415                                               ELSIF SymTab.IsLongFamily(dt) THEN
+ 1416                                                 IF wconv THEN
+ 1417                                                   QbeGen.WidenLong(qe, ql);
+ 1418                                                   QbeGen.ElemStore(qd, ql,
+ 1419                                                     dt)
+ 1420                                                 ELSE QbeGen.ElemStore(qd, qe,
+ 1421                                                   dt)
+ 1422                                                 END
+ 1423                                               ELSIF conv THEN
+ 1424                                                 QbeGen.ConvIR(qe, qt);
+ 1425                                                 QbeGen.ElemStore(qd, qt,
+ 1426                                                   dt)
+ 1427                                               ELSE QbeGen.ElemStore(qd, qe,
+ 1428                                                 dt)
+ 1429                                               END
+ 1430                                             ELSIF SymTab.ClassOf(dt) =
+ 1431                                                   SymTab.ClArray THEN
+ 1432                                               IF (et # SymTab.InvalidType)
+ 1433    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
+ 1434    AND SymTab.IsUCharArray(dt) THEN
+ 1435                                                 QbeGen.UAssign(qd, qe)
+ 1436                                               ELSIF SymTab.StrCompat(dt,
+ 1437                                                    et) THEN
+ 1438                                                 QbeGen.StrAssign(qd, qe)
+ 1439                                               ELSE
+ 1440                                                 QbeGen.CopyArray(qd, qe,
+ 1441                                                   dt)
+ 1442                                               END
+ 1443                                             ELSIF SymTab.ClassOf(dt) =
+ 1444                                                   SymTab.ClSet THEN
+ 1445                                               QbeGen.CopySet(qd, qe,
+ 1446                                                 SymTab.SetWords(dt),
+ 1447                                                 SymTab.SetWords(et))
+ 1448                                             ELSIF SymTab.ClassOf(dt) =
+ 1449                                                   SymTab.ClRecord THEN
+ 1450                                               QbeGen.CopyRecord(qd, qe, dt)
+ 1451                                             ELSIF (SymTab.ClassOf(dt) =
+ 1452                                                   SymTab.ClPtr)
+ 1453                                                OR (SymTab.ClassOf(dt) =
+ 1454                                                   SymTab.ClProc) THEN
+ 1455                                               QbeGen.StorePtr(qn, qe)
+ 1456                                             ELSIF SymTab.IsLongFamily(dt) THEN
+ 1457                                               IF wconv THEN
+ 1458                                                 QbeGen.WidenLong(qe, ql);
+ 1459                                                 QbeGen.StoreLong(qn, ql)
+ 1460                                               ELSE QbeGen.StoreLong(qn, qe)
+ 1461                                               END
+ 1462                                             ELSIF conv THEN
+ 1463                                               QbeGen.ConvIR(qe, qt);
+ 1464                                               QbeGen.StoreVar(qn, qt, TRUE)
+ 1465                                             ELSE
+ 1466                                               QbeGen.StoreVar(qn, qe, isR)
+ 1467                                             END
+ 1468                                           END; .)
+ 1469        | ArgList<qn, dt, qd, FALSE, FALSE, methCls, ct2, q2, called>
+ 1470                                          (. astStmt := AstCallNode(astLhs); .)
+ 1471        |                                 (* bare `P;`: proper parameterless
+ 1472                                              procedure call; anything else
+ 1473                                              here is 233 (was a bare syntax
+ 1474                                              error before 4.2) *)
+ 1475                                          (. astStmt := AstCallNode(astLhs);
+ 1476                                              IF (dk = SymTab.KindProc)
+ 1477   AND NOT sfx THEN
+ 1478                                               res0 := SymTab.ProcRes(qn);
+ 1479                                               IF res0 #
+ 1480                                                  SymTab.InvalidType THEN
+ 1481                                                 SemError(233)
+ 1482                                               ELSIF SymTab.ProcNPar(qn) #
+ 1483                                                       0 THEN
+ 1484                                                 SemError(233)
+ 1485                                               ELSE QbeGen.Mangled(qn,
+ 1486                                                 SymTab.ProcUid(qn), mg0);
+ 1487                                                 QbeGen.CallBegin(mg0,
+ 1488                                                   res0,
+ 1489                                                   SymTab.ProcDepthOf(qn),
+ 1490                                                   SymTab.IsExternal(qn));
+ 1491                                                 QbeGen.CallEnd(FALSE, q2)
+ 1492                                               END
+ 1493                                             ELSE SemError(233)
+ 1494                                             END; .) ) .
+ 1495    (* Actual-parameter list shared by statement and expression calls.
+ 1496       want selects CallEnd's result handling; t/q carry the call
+ 1497       value (statement calls discard). Arity/type failures are 233;
+ 1498       evaluation code still emits so the .ssa stays assembleable. *)
+ 1499    ArgList<pn: SymTab.Name; pt: SymTab.TypeIndex; callee: QbeGen.QVal;
+ 1500            want: BOOLEAN; soft: BOOLEAN; methCls: SymTab.TypeIndex;
+ 1501            VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
+ 1502            VAR called: BOOLEAN>          (. VAR i, np: CARDINAL;
+ 1503                                               vs: INTEGER;
+ 1504                                               res: SymTab.TypeIndex;
+ 1505                                               mg: QbeGen.QVal;
+ 1506                                               ok, ind, isMeth, va: BOOLEAN; .)
+ 1507      = "("                               (. called := TRUE;
+ 1508                                             ok := TRUE;
+ 1509                                             ind := FALSE;
+ 1510                                             isMeth := methCls #
+ 1511                                               SymTab.InvalidType;
+ 1512                                             IF isMeth THEN
+ 1513                                               (* class method: the
+ 1514                                                  receiver is armed.
+ 1515                                                  Virtual -> dispatch
+ 1516                                                  through the vtable;
+ 1517                                                  otherwise a static
+ 1518                                                  call. *)
+ 1519                                               res := SymTab.ClassMethodRes(
+ 1520                                                 methCls, pn);
+ 1521                                               vs := SymTab.VirtSlot(
+ 1522                                                 methCls, pn);
+ 1523                                               IF vs >= 0 THEN
+ 1524                                                 QbeGen.VirtCallBegin(
+ 1525                                                   callee, vs, res)
+ 1526                                               ELSE
+ 1527                                                 QbeGen.Mangled(pn,
+ 1528                                                   SymTab.ClassMethodUid(
+ 1529                                                   methCls, pn), mg);
+ 1530                                                 QbeGen.CallBegin(mg, res, 0,
+ 1531                                                   FALSE)
+ 1532                                               END
+ 1533                                             ELSIF SymTab.SymKind(pn) =
+ 1534                                                SymTab.KindProc THEN
+ 1535                                               res := SymTab.ProcRes(pn);
+ 1536                                               QbeGen.Mangled(pn,
+ 1537                                                 SymTab.ProcUid(pn), mg);
+ 1538                                               QbeGen.CallBegin(mg, res,
+ 1539                                                 SymTab.ProcDepthOf(pn),
+ 1540                                                 SymTab.IsExternal(pn))
+ 1541                                             ELSIF (pt # SymTab.InvalidType)
+ 1542    AND (SymTab.ClassOf(pt) = SymTab.ClProc) THEN
+ 1543                                               ind := TRUE;
+ 1544                                               res :=
+ 1545                                                 SymTab.ProcTypeRes(pt);
+ 1546                                               QbeGen.CallBeginInd(callee,
+ 1547                                                 res, FALSE)
+ 1548                                             ELSE SemError(233);
+ 1549                                               ok := FALSE;
+ 1550                                               res := SymTab.InvalidType
+ 1551                                             END;
+ 1552                                             i := 0; .)
+ 1553        [ ActParam<pn, pt, ind, methCls, i>        (. INC(i); .)
+ 1554          { "," ActParam<pn, pt, ind, methCls, i>  (. INC(i); .) } ]
+ 1555        ")"                               (. IF ok THEN
+ 1556                                               IF isMeth THEN
+ 1557                                                 np := SymTab.ClassMethodNPar(
+ 1558                                                   methCls, pn)
+ 1559                                               ELSIF ind THEN
+ 1560                                                 np := SymTab.ProcTypeNPar(pt)
+ 1561                                               ELSE np := SymTab.ProcNPar(pn)
+ 1562                                               END;
+ 1563                                               va := (NOT isMeth) AND (NOT ind)
+ 1564                                                 AND (SymTab.SymKind(pn) =
+ 1565                                                      SymTab.KindProc)
+ 1566                                                 AND SymTab.Varargs(pn);
+ 1567                                               IF (i # np) AND NOT va THEN
+ 1568                                                 SemError(233); ok := FALSE
+ 1569                                               END
+ 1570                                             END;
+ 1571                                             IF NOT ok THEN
  1572                                               t := SymTab.InvalidType;
- 1573                                               QbeGen.CopyOp("0", q);
- 1574                                               QbeGen.CallEnd(FALSE, q)
- 1575                                             END; .) .
- 1576    (* One actual: VAR formals take recorded designator addresses
- 1577       (233 otherwise); value formals take converted expressions. *)
- 1578    ActParam<pn: SymTab.Name; pt: SymTab.TypeIndex; ind: BOOLEAN;
- 1579             methCls: SymTab.TypeIndex; i: CARDINAL>
- 1580                                          (. VAR at, ft: SymTab.TypeIndex;
- 1581                                               qe, qa, qt: QbeGen.QVal;
- 1582                                               isV, conv, va: BOOLEAN;
- 1583                                               cl: CHAR; .)
- 1584      = Expr<at, qe> (. IF astNArgs <= HIGH(astArgs) THEN
- 1585                                               astArgs[astNArgs] := astCur;
- 1586                                               INC(astNArgs)
- 1587                                             END;
- 1588                                             va := (NOT ind)
- 1589                                               AND (methCls =
- 1590                                                  SymTab.InvalidType)
- 1591                                               AND (SymTab.SymKind(pn) =
- 1592                                                  SymTab.KindProc)
- 1593                                               AND SymTab.Varargs(pn);
- 1594                                             IF ind THEN
- 1595                                               ft :=
- 1596                                                 SymTab.ProcTypeParamType(pt,
- 1597                                                   i);
- 1598                                               isV :=
- 1599                                                 SymTab.ProcTypeParamIsVar(pt,
- 1600                                                   i)
- 1601                                             ELSIF methCls #
- 1602                                                SymTab.InvalidType THEN
- 1603                                               ft :=
- 1604                                                 SymTab.ClassMethodParamType(
- 1605                                                 methCls, pn, i);
- 1606                                               isV :=
- 1607                                                 SymTab.ClassMethodParamIsVar(
- 1608                                                 methCls, pn, i)
- 1609                                             ELSE
- 1610                                               ft := SymTab.ParamType(pn, i);
- 1611                                               isV := SymTab.ParamIsVar(pn, i)
- 1612                                             END;
- 1613                                             IF (at = SymTab.InvalidType) THEN
- 1614                                             ELSIF ft = SymTab.InvalidType THEN
- 1615                                               IF va THEN
- 1616                                                 QbeGen.CArgAdd(qe, at, qa, cl)
- 1617                                               END
- 1618                                             ELSIF isV THEN
- 1619                                               IF (SymTab.ClassOf(at)
- 1620                                                  = SymTab.ClChar)
- 1621    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
- 1622    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
- 1623         = SymTab.ClChar)
- 1624    AND QbeGen.IsImm(qe) THEN
- 1625                                                 (* 1-char string
- 1626                                                    literal passed to
- 1627                                                    a VAR ARRAY OF CHAR *)
- 1628                                                 QbeGen.DeclCharStr(qe,
- 1629                                                      qa);
- 1630                                                 IF NOT QbeGen.CallArg(qa,
- 1631                                                    "l") THEN
- 1632                                                   SemError(233)
- 1633                                                 END
- 1634                                               ELSIF NOT QbeGen.AddrOfVal(qe,
- 1635                                                    qa) THEN
- 1636                                                 SemError(233)
- 1637                                               ELSIF NOT SymTab.VarParamOk(at,
- 1638                                                        ft) THEN
- 1639                                                 SemError(233)
- 1640                                               ELSIF NOT QbeGen.CallArg(qa,
- 1641                                                        "l") THEN
- 1642                                                 SemError(233)
- 1643                                               END
- 1644                                             ELSE
- 1645                                               IF (SymTab.ClassOf(at)
- 1646                                                  = SymTab.ClChar)
- 1647    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
- 1648    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
- 1649         = SymTab.ClChar)
- 1650    AND QbeGen.IsImm(qe) THEN
- 1651                                                 (* 1-char string
- 1652                                                    literal passed to
- 1653                                                    ARRAY OF CHAR *)
- 1654                                                 QbeGen.DeclCharStr(qe,
- 1655                                                      qa);
- 1656                                                 IF NOT QbeGen.CallArg(qa,
- 1657                                                    "l") THEN
- 1658                                                   SemError(233)
- 1659                                                 END
- 1660                                               ELSIF NOT SymTab.Assignable(at,
- 1661                                                    ft) THEN
- 1662                                                 SemError(233)
- 1663                                               ELSE
- 1664                                                 conv := (SymTab.ClassOf(
- 1665                                                   ft) = SymTab.ClReal)
- 1666   AND SymTab.IsIntFamily(at);
- 1667                                                 IF conv THEN
- 1668                                                   QbeGen.ConvIR(qe, qt);
- 1669                                                   IF NOT QbeGen.CallArg(qt,
- 1670                                                      "d") THEN
- 1671                                                     SemError(233)
- 1672                                                   END
- 1673                                                 ELSIF NOT QbeGen.CallArg(qe,
- 1674                                                   QbeGen.ArgClass(ft)) THEN
- 1675                                                   SemError(233)
- 1676                                                 END
- 1677                                               END
- 1678                                             END; .) .
- 1679    IfStat                                (. VAR t: SymTab.TypeIndex;
- 1680                                               q, lThen, lElse, lEnd:
- 1681                                                 QbeGen.QVal;
- 1682                                               hasElse: BOOLEAN;
- 1683                                               astCond, astIf, astLast,
- 1684                                               astNode: AST.Node; .)
- 1685      = "IF" (. hasElse := FALSE; .)
- 1686        Expr<t, q> (. astCond := astCur; astStmt := AST.NoNode;
- 1687                                             IF NOT SymTab.BoolCheck(t) THEN
- 1688                                               SemError(214) END;
- 1689                                             QbeGen.NewLabel(lThen);
- 1690                                             QbeGen.NewLabel(lElse);
- 1691                                             QbeGen.NewLabel(lEnd);
- 1692                                             QbeGen.Jnz(q, lThen, lElse);
- 1693                                             QbeGen.EmitLabel(lThen); .)
- 1694        "THEN" [ StatSeq ]                (. astNode := AST.MakeNode(AST.NkIf);
- 1695                                             AST.SetChild(astNode, 0, astCond);
- 1696                                             AST.SetChild(astNode, 1, astStmt);
- 1697                                             astIf := astNode;
- 1698                                             astLast := astNode;
- 1699                                             QbeGen.Jmp(lEnd); .)
- 1700        { "ELSIF"                         (. QbeGen.EmitLabel(lElse);
- 1701                                             QbeGen.NewLabel(lElse); .)
- 1702          Expr<t, q> (. astCond := astCur; astStmt := AST.NoNode;
+ 1573                                               QbeGen.CopyOp("0", q)
+ 1574                                             ELSIF want THEN
+ 1575                                               IF res =
+ 1576                                                  SymTab.InvalidType THEN
+ 1577                                                 SemError(233);
+ 1578                                                 t := SymTab.InvalidType;
+ 1579                                                 QbeGen.CopyOp("0", q)
+ 1580                                               ELSE t := res;
+ 1581                                                 QbeGen.CallEnd(TRUE, q)
+ 1582                                               END
+ 1583                                             ELSE
+ 1584                                               IF res #
+ 1585                                                  SymTab.InvalidType THEN
+ 1586                                                 SemError(233)
+ 1587                                               END;
+ 1588                                               t := SymTab.InvalidType;
+ 1589                                               QbeGen.CopyOp("0", q);
+ 1590                                               QbeGen.CallEnd(FALSE, q)
+ 1591                                             END; .) .
+ 1592    (* One actual: VAR formals take recorded designator addresses
+ 1593       (233 otherwise); value formals take converted expressions. *)
+ 1594    ActParam<pn: SymTab.Name; pt: SymTab.TypeIndex; ind: BOOLEAN;
+ 1595             methCls: SymTab.TypeIndex; i: CARDINAL>
+ 1596                                          (. VAR at, ft: SymTab.TypeIndex;
+ 1597                                               qe, qa, qt: QbeGen.QVal;
+ 1598                                               isV, conv, va: BOOLEAN;
+ 1599                                               cl: CHAR; .)
+ 1600      = Expr<at, qe> (. IF astNArgs <= HIGH(astArgs) THEN
+ 1601                                               astArgs[astNArgs] := astCur;
+ 1602                                               INC(astNArgs)
+ 1603                                             END;
+ 1604                                             va := (NOT ind)
+ 1605                                               AND (methCls =
+ 1606                                                  SymTab.InvalidType)
+ 1607                                               AND (SymTab.SymKind(pn) =
+ 1608                                                  SymTab.KindProc)
+ 1609                                               AND SymTab.Varargs(pn);
+ 1610                                             IF ind THEN
+ 1611                                               ft :=
+ 1612                                                 SymTab.ProcTypeParamType(pt,
+ 1613                                                   i);
+ 1614                                               isV :=
+ 1615                                                 SymTab.ProcTypeParamIsVar(pt,
+ 1616                                                   i)
+ 1617                                             ELSIF methCls #
+ 1618                                                SymTab.InvalidType THEN
+ 1619                                               ft :=
+ 1620                                                 SymTab.ClassMethodParamType(
+ 1621                                                 methCls, pn, i);
+ 1622                                               isV :=
+ 1623                                                 SymTab.ClassMethodParamIsVar(
+ 1624                                                 methCls, pn, i)
+ 1625                                             ELSE
+ 1626                                               ft := SymTab.ParamType(pn, i);
+ 1627                                               isV := SymTab.ParamIsVar(pn, i)
+ 1628                                             END;
+ 1629                                             IF (at = SymTab.InvalidType) THEN
+ 1630                                             ELSIF ft = SymTab.InvalidType THEN
+ 1631                                               IF va THEN
+ 1632                                                 QbeGen.CArgAdd(qe, at, qa, cl)
+ 1633                                               END
+ 1634                                             ELSIF isV THEN
+ 1635                                               IF (SymTab.ClassOf(at)
+ 1636                                                  = SymTab.ClChar)
+ 1637    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
+ 1638    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
+ 1639         = SymTab.ClChar)
+ 1640    AND QbeGen.IsImm(qe) THEN
+ 1641                                                 (* 1-char string
+ 1642                                                    literal passed to
+ 1643                                                    a VAR ARRAY OF CHAR *)
+ 1644                                                 QbeGen.DeclCharStr(qe,
+ 1645                                                      qa);
+ 1646                                                 IF NOT QbeGen.CallArg(qa,
+ 1647                                                    "l") THEN
+ 1648                                                   SemError(233)
+ 1649                                                 END
+ 1650                                               ELSIF NOT QbeGen.AddrOfVal(qe,
+ 1651                                                    qa) THEN
+ 1652                                                 SemError(233)
+ 1653                                               ELSIF NOT SymTab.VarParamOk(at,
+ 1654                                                        ft) THEN
+ 1655                                                 SemError(233)
+ 1656                                               ELSIF NOT QbeGen.CallArg(qa,
+ 1657                                                        "l") THEN
+ 1658                                                 SemError(233)
+ 1659                                               END
+ 1660                                             ELSE
+ 1661                                               IF (SymTab.ClassOf(at)
+ 1662                                                  = SymTab.ClChar)
+ 1663    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
+ 1664    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
+ 1665         = SymTab.ClChar)
+ 1666    AND QbeGen.IsImm(qe) THEN
+ 1667                                                 (* 1-char string
+ 1668                                                    literal passed to
+ 1669                                                    ARRAY OF CHAR *)
+ 1670                                                 QbeGen.DeclCharStr(qe,
+ 1671                                                      qa);
+ 1672                                                 IF NOT QbeGen.CallArg(qa,
+ 1673                                                    "l") THEN
+ 1674                                                   SemError(233)
+ 1675                                                 END
+ 1676                                               ELSIF NOT SymTab.Assignable(at,
+ 1677                                                    ft) THEN
+ 1678                                                 SemError(233)
+ 1679                                               ELSE
+ 1680                                                 conv := (SymTab.ClassOf(
+ 1681                                                   ft) = SymTab.ClReal)
+ 1682   AND SymTab.IsIntFamily(at);
+ 1683                                                 IF conv THEN
+ 1684                                                   QbeGen.ConvIR(qe, qt);
+ 1685                                                   IF NOT QbeGen.CallArg(qt,
+ 1686                                                      "d") THEN
+ 1687                                                     SemError(233)
+ 1688                                                   END
+ 1689                                                 ELSIF NOT QbeGen.CallArg(qe,
+ 1690                                                   QbeGen.ArgClass(ft)) THEN
+ 1691                                                   SemError(233)
+ 1692                                                 END
+ 1693                                               END
+ 1694                                             END; .) .
+ 1695    IfStat                                (. VAR t: SymTab.TypeIndex;
+ 1696                                               q, lThen, lElse, lEnd:
+ 1697                                                 QbeGen.QVal;
+ 1698                                               hasElse: BOOLEAN;
+ 1699                                               astCond, astIf, astLast,
+ 1700                                               astNode: AST.Node; .)
+ 1701      = "IF" (. hasElse := FALSE; .)
+ 1702        Expr<t, q> (. astCond := astCur; astStmt := AST.NoNode;
  1703                                             IF NOT SymTab.BoolCheck(t) THEN
  1704                                               SemError(214) END;
  1705                                             QbeGen.NewLabel(lThen);
- 1706                                             QbeGen.Jnz(q, lThen, lElse);
- 1707                                             QbeGen.EmitLabel(lThen); .)
- 1708          "THEN" [ StatSeq ]              (. astNode := AST.MakeNode(AST.NkIf);
- 1709                                             AST.SetChild(astNode, 0, astCond);
- 1710                                             AST.SetChild(astNode, 1, astStmt);
- 1711                                             AST.SetChild(astLast, 2, astNode);
- 1712                                             astLast := astNode;
- 1713                                             QbeGen.Jmp(lEnd); .) }
- 1714        [ "ELSE"                          (. QbeGen.EmitLabel(lElse);
- 1715                                             hasElse := TRUE;
- 1716                                             astStmt := AST.NoNode; .)
- 1717          [ StatSeq ] (. AST.SetChild(astLast, 2, astStmt); .) ]
- 1718        "END" (. astStmt := astIf;
- 1719                                             IF hasElse THEN
- 1720                                               QbeGen.EmitLabel(lEnd)
- 1721                                             ELSE QbeGen.EmitLabel(lElse);
- 1722                                               QbeGen.EmitLabel(lEnd)
- 1723                                             END; .) .
- 1724    WhileStat                             (. VAR t: SymTab.TypeIndex;
- 1725                                               q, lTop, lBody, lEnd:
- 1726                                                 QbeGen.QVal;
- 1727                                               astCond, astNode: AST.Node; .)
- 1728      = "WHILE" (. astStmt := AST.NoNode;
- 1729                                             QbeGen.NewLabel(lTop);
- 1730                                             QbeGen.NewLabel(lBody);
- 1731                                             QbeGen.NewLabel(lEnd);
- 1732                                             QbeGen.EmitLabel(lTop); .)
- 1733        Expr<t, q> (. astCond := astCur;
- 1734                                             IF NOT SymTab.BoolCheck(t) THEN
- 1735                                               SemError(214) END;
- 1736                                             QbeGen.Jnz(q, lBody, lEnd);
- 1737                                             QbeGen.EmitLabel(lBody); .)
- 1738        "DO" [ StatSeq ]                      (. astNode := AST.MakeNode(AST.NkWhile);
- 1739                                             AST.SetChild(astNode, 0, astCond);
- 1740                                             AST.SetChild(astNode, 1, astStmt);
- 1741                                             astStmt := astNode;
- 1742                                             QbeGen.Jmp(lTop); .)
- 1743        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
- 1744    RepeatStat                            (. VAR t: SymTab.TypeIndex;
- 1745                                               q, lTop, lEnd: QbeGen.QVal;
- 1746                                               astCond, astBody, astNode:
- 1747                                                 AST.Node; .)
- 1748      = "REPEAT" (. astStmt := AST.NoNode;
- 1749                                             QbeGen.NewLabel(lTop);
- 1750                                             QbeGen.NewLabel(lEnd);
- 1751                                             QbeGen.EmitLabel(lTop); .)
- 1752        [ StatSeq ] (. astBody := astStmt; .)
- 1753        "UNTIL" Expr<t, q> (. astCond := astCur;
- 1754                                             astNode := AST.MakeNode(AST.NkRepeat);
- 1755                                             AST.SetChild(astNode, 0, astBody);
- 1756                                             AST.SetChild(astNode, 1, astCond);
+ 1706                                             QbeGen.NewLabel(lElse);
+ 1707                                             QbeGen.NewLabel(lEnd);
+ 1708                                             QbeGen.Jnz(q, lThen, lElse);
+ 1709                                             QbeGen.EmitLabel(lThen); .)
+ 1710        "THEN" [ StatSeq ]                (. astNode := AST.MakeNode(AST.NkIf);
+ 1711                                             AST.SetChild(astNode, 0, astCond);
+ 1712                                             AST.SetChild(astNode, 1, astStmt);
+ 1713                                             astIf := astNode;
+ 1714                                             astLast := astNode;
+ 1715                                             QbeGen.Jmp(lEnd); .)
+ 1716        { "ELSIF"                         (. QbeGen.EmitLabel(lElse);
+ 1717                                             QbeGen.NewLabel(lElse); .)
+ 1718          Expr<t, q> (. astCond := astCur; astStmt := AST.NoNode;
+ 1719                                             IF NOT SymTab.BoolCheck(t) THEN
+ 1720                                               SemError(214) END;
+ 1721                                             QbeGen.NewLabel(lThen);
+ 1722                                             QbeGen.Jnz(q, lThen, lElse);
+ 1723                                             QbeGen.EmitLabel(lThen); .)
+ 1724          "THEN" [ StatSeq ]              (. astNode := AST.MakeNode(AST.NkIf);
+ 1725                                             AST.SetChild(astNode, 0, astCond);
+ 1726                                             AST.SetChild(astNode, 1, astStmt);
+ 1727                                             AST.SetChild(astLast, 2, astNode);
+ 1728                                             astLast := astNode;
+ 1729                                             QbeGen.Jmp(lEnd); .) }
+ 1730        [ "ELSE"                          (. QbeGen.EmitLabel(lElse);
+ 1731                                             hasElse := TRUE;
+ 1732                                             astStmt := AST.NoNode; .)
+ 1733          [ StatSeq ] (. AST.SetChild(astLast, 2, astStmt); .) ]
+ 1734        "END" (. astStmt := astIf;
+ 1735                                             IF hasElse THEN
+ 1736                                               QbeGen.EmitLabel(lEnd)
+ 1737                                             ELSE QbeGen.EmitLabel(lElse);
+ 1738                                               QbeGen.EmitLabel(lEnd)
+ 1739                                             END; .) .
+ 1740    WhileStat                             (. VAR t: SymTab.TypeIndex;
+ 1741                                               q, lTop, lBody, lEnd:
+ 1742                                                 QbeGen.QVal;
+ 1743                                               astCond, astNode: AST.Node; .)
+ 1744      = "WHILE" (. astStmt := AST.NoNode;
+ 1745                                             QbeGen.NewLabel(lTop);
+ 1746                                             QbeGen.NewLabel(lBody);
+ 1747                                             QbeGen.NewLabel(lEnd);
+ 1748                                             QbeGen.EmitLabel(lTop); .)
+ 1749        Expr<t, q> (. astCond := astCur;
+ 1750                                             IF NOT SymTab.BoolCheck(t) THEN
+ 1751                                               SemError(214) END;
+ 1752                                             QbeGen.Jnz(q, lBody, lEnd);
+ 1753                                             QbeGen.EmitLabel(lBody); .)
+ 1754        "DO" [ StatSeq ]                      (. astNode := AST.MakeNode(AST.NkWhile);
+ 1755                                             AST.SetChild(astNode, 0, astCond);
+ 1756                                             AST.SetChild(astNode, 1, astStmt);
  1757                                             astStmt := astNode;
- 1758                                             IF NOT SymTab.BoolCheck(t) THEN
- 1759                                               SemError(214) END;
- 1760                                             QbeGen.Jnz(q, lEnd, lTop);
- 1761                                             QbeGen.EmitLabel(lEnd); .) .
- 1762    LoopStat                              (. VAR lTop, lEnd: QbeGen.QVal; astNode: AST.Node; .)
- 1763      = "LOOP"                            (. QbeGen.NewLabel(lTop);
- 1764                                                    astStmt := AST.NoNode;
- 1765                                             QbeGen.NewLabel(lEnd);
- 1766                                             QbeGen.PushLoop(lEnd);
+ 1758                                             QbeGen.Jmp(lTop); .)
+ 1759        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
+ 1760    RepeatStat                            (. VAR t: SymTab.TypeIndex;
+ 1761                                               q, lTop, lEnd: QbeGen.QVal;
+ 1762                                               astCond, astBody, astNode:
+ 1763                                                 AST.Node; .)
+ 1764      = "REPEAT" (. astStmt := AST.NoNode;
+ 1765                                             QbeGen.NewLabel(lTop);
+ 1766                                             QbeGen.NewLabel(lEnd);
  1767                                             QbeGen.EmitLabel(lTop); .)
- 1768        [ StatSeq ]
- 1769        "END"                             (. astNode := AST.MakeNode(AST.NkLoop);
- 1770                                             AST.SetChild(astNode, 0, astStmt);
- 1771                                             astStmt := astNode;
- 1772                                             QbeGen.Jmp(lTop);
- 1773                                             QbeGen.PopLoop;
- 1774                                             QbeGen.EmitLabel(lEnd); .) .
- 1775    (* FOR with static-sign BY (literal, non-zero; 220 otherwise).
- 1776       Runtime direction would need a compare-select; the literal
- 1777       sign picks cslew/csegew at "DO" time. *)
- 1778    ForStat                               (. VAR lv: SymTab.Name;
- 1779                                               tlo, thi, tby:
- 1780                                                 SymTab.TypeIndex;
- 1781                                               qlo, qhi, qby, qt, qk, qb:
- 1782                                                 QbeGen.QVal;
- 1783                                               lTop, lBody, lEnd:
- 1784                                                 QbeGen.QVal;
- 1785                                               by: INTEGER;
- 1786                                               ok: BOOLEAN;
- 1787                                               astVar, astLo, astHi, astBy,
- 1788                                               astNode: AST.Node; .)
- 1789      = "FOR"                             (. by := 1; .)
- 1790        GetIdent<lv> (. astVar := AST.MakeLeaf(AST.NkIdent, lv);
- 1791                                             astStmt := AST.NoNode;
- 1792                                             astBy := AST.NoNode;
- 1793                                             ok := SymTab.Lookup(lv);
- 1794                                             IF NOT ok THEN
- 1795                                               SemError(201)
- 1796                                             ELSIF (SymTab.SymKind(lv) #
- 1797                                                    SymTab.KindVar)
- 1798   AND (SymTab.SymKind(lv) #
- 1799                                                   SymTab.KindParam) THEN
- 1800                                               SemError(220); ok := FALSE
- 1801                                             ELSIF NOT SymTab.IsIntFamily(
- 1802                                                     SymTab.SymType(lv)) THEN
- 1803                                               SemError(220); ok := FALSE
- 1804                                             END; .)
- 1805        ":=" Expr<tlo, qlo> (. astLo := astCur;
- 1806                                             IF NOT SymTab.IsIntFamily(tlo) THEN
- 1807                                               SemError(220); ok := FALSE
- 1808                                             END; .)
- 1809        "TO" Expr<thi, qhi> (. astHi := astCur;
- 1810                                             IF NOT SymTab.IsIntFamily(thi) THEN
- 1811                                               SemError(220); ok := FALSE
- 1812                                             END; .)
- 1813        [ "BY" Expr<tby, qby> (. astBy := astCur;
- 1814                                             IF (tby #
- 1815                                               SymTab.InvalidType)
- 1816   AND NOT SymTab.IsIntFamily(tby) THEN
- 1817                                               SemError(220); ok := FALSE
- 1818                                             END;
- 1819                                             IF NOT SymTab.ConstInt(qby, by) THEN
- 1820                                               SemError(230); by := 1
- 1821                                             ELSIF by = 0 THEN
- 1822                                               SemError(220); by := 1
- 1823                                             END; .) ]
- 1824        "DO"                              (. IF ok THEN
- 1825                                               QbeGen.StoreVar(lv, qlo,
- 1826                                                 FALSE) END;
- 1827                                             QbeGen.NewLabel(lTop);
- 1828                                             QbeGen.NewLabel(lBody);
- 1829                                             QbeGen.NewLabel(lEnd);
- 1830                                             QbeGen.EmitLabel(lTop);
- 1831                                             QbeGen.LoadVar(lv, FALSE, qt);
- 1832                                             QbeGen.NewTemp(qk);
- 1833                                             IF by > 0 THEN
- 1834                                               QbeGen.Op3("cslew", qk,
- 1835                                                 qt, qhi, FALSE)
- 1836                                             ELSE QbeGen.Op3("csgew", qk,
- 1837                                               qt, qhi, FALSE)
- 1838                                             END;
- 1839                                             QbeGen.Jnz(qk, lBody, lEnd);
- 1840                                             QbeGen.EmitLabel(lBody); .)
- 1841        [ StatSeq ]
- 1842        "END" (. astNode := AST.MakeNode(AST.NkFor);
- 1843                                             AST.SetChild(astNode, 0, astVar);
- 1844                                             AST.SetChild(astNode, 1, astLo);
- 1845                                             AST.SetChild(astNode, 2, astHi);
- 1846                                             AST.SetChild(astNode, 3, astBy);
- 1847                                             AST.SetChild(astNode, 4, astStmt);
- 1848                                             astStmt := astNode;
- 1849                                             IF ok THEN
- 1850                                               QbeGen.LoadVar(lv, FALSE,
- 1851                                                 qt);
- 1852                                               QbeGen.IntStr(by, qb);
- 1853                                               QbeGen.NewTemp(qk);
- 1854                                               QbeGen.Op3("add", qk,
- 1855                                                 qt, qb, FALSE);
- 1856                                               QbeGen.StoreVar(lv, qk,
- 1857                                                 FALSE) END;
- 1858                                             QbeGen.Jmp(lTop);
- 1859                                             QbeGen.EmitLabel(lEnd); .) .
- 1860    CaseStat                              (. VAR tsel: SymTab.TypeIndex;
- 1861                                               qsel, lEnd: QbeGen.QVal;
- 1862                                               arm, astNode: AST.Node; .)
- 1863      = "CASE" Expr<tsel, qsel>           (. astNode := AST.MakeNode(AST.NkCase);
- 1864                                             AST.SetChild(astNode, 0, astCur);
- 1865                                             QbeGen.NewLabel(lEnd); .)
- 1866        "OF" CaseAlt<tsel, qsel, lEnd, astNode>
- 1867        { "|" CaseAlt<tsel, qsel, lEnd, astNode> }
- 1868        [ "ELSE"                          (. astStmt := AST.NoNode; .)
- 1869          [ StatSeq ]                     (. arm := AST.MakeNode(AST.NkCaseArm);
- 1870                                             AST.SetOp(arm, 1);
- 1871                                             AST.SetChild(arm, 0, astStmt);
- 1872                                             AST.SetChild(astNode,
- 1873                                               AST.NChild(astNode), arm); .) ]
- 1874        "END"                             (. astStmt := astNode;
+ 1768        [ StatSeq ] (. astBody := astStmt; .)
+ 1769        "UNTIL" Expr<t, q> (. astCond := astCur;
+ 1770                                             astNode := AST.MakeNode(AST.NkRepeat);
+ 1771                                             AST.SetChild(astNode, 0, astBody);
+ 1772                                             AST.SetChild(astNode, 1, astCond);
+ 1773                                             astStmt := astNode;
+ 1774                                             IF NOT SymTab.BoolCheck(t) THEN
+ 1775                                               SemError(214) END;
+ 1776                                             QbeGen.Jnz(q, lEnd, lTop);
+ 1777                                             QbeGen.EmitLabel(lEnd); .) .
+ 1778    LoopStat                              (. VAR lTop, lEnd: QbeGen.QVal; astNode: AST.Node; .)
+ 1779      = "LOOP"                            (. QbeGen.NewLabel(lTop);
+ 1780                                                    astStmt := AST.NoNode;
+ 1781                                             QbeGen.NewLabel(lEnd);
+ 1782                                             QbeGen.PushLoop(lEnd);
+ 1783                                             QbeGen.EmitLabel(lTop); .)
+ 1784        [ StatSeq ]
+ 1785        "END"                             (. astNode := AST.MakeNode(AST.NkLoop);
+ 1786                                             AST.SetChild(astNode, 0, astStmt);
+ 1787                                             astStmt := astNode;
+ 1788                                             QbeGen.Jmp(lTop);
+ 1789                                             QbeGen.PopLoop;
+ 1790                                             QbeGen.EmitLabel(lEnd); .) .
+ 1791    (* FOR with static-sign BY (literal, non-zero; 220 otherwise).
+ 1792       Runtime direction would need a compare-select; the literal
+ 1793       sign picks cslew/csegew at "DO" time. *)
+ 1794    ForStat                               (. VAR lv: SymTab.Name;
+ 1795                                               tlo, thi, tby:
+ 1796                                                 SymTab.TypeIndex;
+ 1797                                               qlo, qhi, qby, qt, qk, qb:
+ 1798                                                 QbeGen.QVal;
+ 1799                                               lTop, lBody, lEnd:
+ 1800                                                 QbeGen.QVal;
+ 1801                                               by: INTEGER;
+ 1802                                               ok: BOOLEAN;
+ 1803                                               astVar, astLo, astHi, astBy,
+ 1804                                               astNode: AST.Node; .)
+ 1805      = "FOR"                             (. by := 1; .)
+ 1806        GetIdent<lv> (. astVar := AST.MakeLeaf(AST.NkIdent, lv);
+ 1807                                             astStmt := AST.NoNode;
+ 1808                                             astBy := AST.NoNode;
+ 1809                                             ok := SymTab.Lookup(lv);
+ 1810                                             IF NOT ok THEN
+ 1811                                               SemError(201)
+ 1812                                             ELSIF (SymTab.SymKind(lv) #
+ 1813                                                    SymTab.KindVar)
+ 1814   AND (SymTab.SymKind(lv) #
+ 1815                                                   SymTab.KindParam) THEN
+ 1816                                               SemError(220); ok := FALSE
+ 1817                                             ELSIF NOT SymTab.IsIntFamily(
+ 1818                                                     SymTab.SymType(lv)) THEN
+ 1819                                               SemError(220); ok := FALSE
+ 1820                                             END; .)
+ 1821        ":=" Expr<tlo, qlo> (. astLo := astCur;
+ 1822                                             IF NOT SymTab.IsIntFamily(tlo) THEN
+ 1823                                               SemError(220); ok := FALSE
+ 1824                                             END; .)
+ 1825        "TO" Expr<thi, qhi> (. astHi := astCur;
+ 1826                                             IF NOT SymTab.IsIntFamily(thi) THEN
+ 1827                                               SemError(220); ok := FALSE
+ 1828                                             END; .)
+ 1829        [ "BY" Expr<tby, qby> (. astBy := astCur;
+ 1830                                             IF (tby #
+ 1831                                               SymTab.InvalidType)
+ 1832   AND NOT SymTab.IsIntFamily(tby) THEN
+ 1833                                               SemError(220); ok := FALSE
+ 1834                                             END;
+ 1835                                             IF NOT SymTab.ConstInt(qby, by) THEN
+ 1836                                               SemError(230); by := 1
+ 1837                                             ELSIF by = 0 THEN
+ 1838                                               SemError(220); by := 1
+ 1839                                             END; .) ]
+ 1840        "DO"                              (. IF ok THEN
+ 1841                                               QbeGen.StoreVar(lv, qlo,
+ 1842                                                 FALSE) END;
+ 1843                                             QbeGen.NewLabel(lTop);
+ 1844                                             QbeGen.NewLabel(lBody);
+ 1845                                             QbeGen.NewLabel(lEnd);
+ 1846                                             QbeGen.EmitLabel(lTop);
+ 1847                                             QbeGen.LoadVar(lv, FALSE, qt);
+ 1848                                             QbeGen.NewTemp(qk);
+ 1849                                             IF by > 0 THEN
+ 1850                                               QbeGen.Op3("cslew", qk,
+ 1851                                                 qt, qhi, FALSE)
+ 1852                                             ELSE QbeGen.Op3("csgew", qk,
+ 1853                                               qt, qhi, FALSE)
+ 1854                                             END;
+ 1855                                             QbeGen.Jnz(qk, lBody, lEnd);
+ 1856                                             QbeGen.EmitLabel(lBody); .)
+ 1857        [ StatSeq ]
+ 1858        "END" (. astNode := AST.MakeNode(AST.NkFor);
+ 1859                                             AST.SetChild(astNode, 0, astVar);
+ 1860                                             AST.SetChild(astNode, 1, astLo);
+ 1861                                             AST.SetChild(astNode, 2, astHi);
+ 1862                                             AST.SetChild(astNode, 3, astBy);
+ 1863                                             AST.SetChild(astNode, 4, astStmt);
+ 1864                                             astStmt := astNode;
+ 1865                                             IF ok THEN
+ 1866                                               QbeGen.LoadVar(lv, FALSE,
+ 1867                                                 qt);
+ 1868                                               QbeGen.IntStr(by, qb);
+ 1869                                               QbeGen.NewTemp(qk);
+ 1870                                               QbeGen.Op3("add", qk,
+ 1871                                                 qt, qb, FALSE);
+ 1872                                               QbeGen.StoreVar(lv, qk,
+ 1873                                                 FALSE) END;
+ 1874                                             QbeGen.Jmp(lTop);
  1875                                             QbeGen.EmitLabel(lEnd); .) .
- 1876    (* Compare-chain lowering: each alternative ends its match-tests
- 1877       with "jmp lAfter", so the no-match fallthrough skips the body:
- 1878       "cmp; jnz(lBody,lF); lF: ... ; jmp lAfter; lBody: S; jmp lEnd;
- 1879       lAfter:". Falls into the next alternative, ELSE, or END. *)
- 1880    CaseAlt<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
- 1881            lEnd: QbeGen.QVal; cnode: AST.Node>
- 1882                                          (. VAR lBody, lAfter: QbeGen.QVal;
- 1883                                               arm: AST.Node; .)
- 1884      =                                   (. arm := AST.MakeNode(AST.NkCaseArm);
- 1885                                             QbeGen.NewLabel(lBody);
- 1886                                             QbeGen.NewLabel(lAfter); .)
- 1887        CaseLabel<tsel, qsel, lBody, arm>
- 1888        { "," CaseLabel<tsel, qsel, lBody, arm> }
- 1889        ":"                               (. astStmt := AST.NoNode;
- 1890                                             QbeGen.Jmp(lAfter);
- 1891                                             QbeGen.EmitLabel(lBody); .)
- 1892        [ StatSeq ]                       (. AST.SetChild(arm, AST.NChild(arm),
- 1893                                             astStmt);
- 1894                                             AST.SetChild(cnode,
- 1895                                               AST.NChild(cnode), arm);
- 1896                                             QbeGen.Jmp(lEnd);
- 1897                                             QbeGen.EmitLabel(lAfter); .) .
- 1898    CaseLabel<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
- 1899              lBody: QbeGen.QVal; arm: AST.Node>
- 1900                                          (. VAR t2, t3: SymTab.TypeIndex;
- 1901                                               q2, q3, qc, qd, qe:
- 1902                                                 QbeGen.QVal;
- 1903                                               astLab: AST.Node;
- 1904                                               lNext: QbeGen.QVal; .)
- 1905      = Expr<t2, q2> (. astLab := astCur;
- 1906                                             IF (t2 #
- 1907                                               SymTab.InvalidType)
- 1908   AND (tsel #
- 1909                                                 SymTab.InvalidType)
- 1910   AND ((SymTab.ClassOf(t2) =
- 1911                                                  SymTab.ClSet)
- 1912                                                 OR (SymTab.ClassOf(tsel) =
- 1913                                                     SymTab.ClSet)) THEN
- 1914                                               SemError(230)
- 1915                                             ELSIF (t2 #
- 1916                                               SymTab.InvalidType)
- 1917   AND (tsel #
- 1918                                                 SymTab.InvalidType)
- 1919   AND NOT SymTab.EqCheck(t2,
- 1920                                                   tsel) THEN
- 1921                                               SemError(213) END;
- 1922                                             IF NOT QbeGen.IsImm(q2) THEN
- 1923                                               SemError(230);
- 1924                                               QbeGen.CopyOp("0", q2)
- 1925                                             END;
- 1926                                             QbeGen.NewLabel(lNext);
- 1927                                             QbeGen.Cmp(SymTab.OpEq,
- 1928                                               qsel, q2, qc, FALSE);
- 1929                                             QbeGen.Jnz(qc, lBody, lNext);
- 1930                                             QbeGen.EmitLabel(lNext); .)
- 1931        [ ".." Expr<t3, q3>               (. astLab := AST.MakeBin(
- 1932                                               AST.NkSubrange, 0, astLab, astCur);
- 1933                                             IF (t3 #
- 1934                                               SymTab.InvalidType)
- 1935   AND (tsel #
- 1936                                                 SymTab.InvalidType)
- 1937   AND NOT SymTab.EqCheck(t3,
- 1938                                                   tsel) THEN
- 1939                                               SemError(213) END;
- 1940                                             IF NOT QbeGen.IsImm(q3) THEN
- 1941                                               SemError(230);
- 1942                                               QbeGen.CopyOp("0", q3)
- 1943                                             END;
- 1944                                             QbeGen.Cmp(SymTab.OpGe,
- 1945                                               qsel, q2, qc, FALSE);
- 1946                                             QbeGen.Cmp(SymTab.OpLe,
- 1947                                               qsel, q3, qd, FALSE);
- 1948                                             QbeGen.NewTemp(qe);
- 1949                                             QbeGen.Op3("and", qe, qc, qd,
- 1950                                               FALSE);
- 1951                                             QbeGen.NewLabel(lNext);
- 1952                                             QbeGen.Jnz(qe, lBody, lNext);
- 1953                                             QbeGen.EmitLabel(lNext); .) ]
- 1954                                          (. AST.SetChild(arm,
- 1955                                               AST.NChild(arm), astLab); .) .
- 1956    ReturnStat                            (. VAR t: SymTab.TypeIndex;
- 1957                                               q, qt: QbeGen.QVal;
- 1958                                               res: SymTab.TypeIndex;
- 1959                                               hadE, conv: BOOLEAN;
- 1960                                               astVal, astNode: AST.Node; .)
- 1961      = "RETURN"                          (. hadE := FALSE; astStmt := AST.NoNode; .)
- 1962        [ Expr<t, q> (. hadE := TRUE; astVal := astCur; .) ]
- 1963                                          (. astNode := AST.MakeNode(AST.NkReturn);
- 1964                                             IF hadE THEN
- 1965                                               AST.SetChild(astNode, 0, astVal)
- 1966                                             END;
- 1967                                             astStmt := astNode;
- 1968                                             conv := FALSE;
- 1969                                             IF NOT SymTab.InProc() THEN
- 1970                                               SemError(232)
- 1971                                             ELSE res := SymTab.CurRes();
- 1972                                               IF NOT hadE THEN
- 1973                                                 IF res #
- 1974                                                    SymTab.InvalidType THEN
- 1975                                                   SemError(232)
- 1976                                                 ELSE QbeGen.EmitRet(q,
- 1977                                                   FALSE)
- 1978                                                 END
- 1979                                               ELSIF (res =
- 1980                                                      SymTab.InvalidType)
- 1981                                                  OR (t #
- 1982                                                      SymTab.InvalidType)
- 1983   AND NOT SymTab.Assignable(t,
- 1984                                                       res) THEN
- 1985                                                 SemError(232)
- 1986                                               ELSE
- 1987                                                 conv := (SymTab.ClassOf(
- 1988                                                   res) = SymTab.ClReal)
- 1989   AND SymTab.IsIntFamily(t);
- 1990                                                 IF conv THEN
- 1991                                                   QbeGen.ConvIR(q, qt);
- 1992                                                   QbeGen.EmitRet(qt, TRUE)
- 1993                                                 ELSE QbeGen.EmitRet(q, TRUE)
+ 1876    CaseStat                              (. VAR tsel: SymTab.TypeIndex;
+ 1877                                               qsel, lEnd: QbeGen.QVal;
+ 1878                                               arm, astNode: AST.Node; .)
+ 1879      = "CASE" Expr<tsel, qsel>           (. astNode := AST.MakeNode(AST.NkCase);
+ 1880                                             AST.SetChild(astNode, 0, astCur);
+ 1881                                             QbeGen.NewLabel(lEnd); .)
+ 1882        "OF" CaseAlt<tsel, qsel, lEnd, astNode>
+ 1883        { "|" CaseAlt<tsel, qsel, lEnd, astNode> }
+ 1884        [ "ELSE"                          (. astStmt := AST.NoNode; .)
+ 1885          [ StatSeq ]                     (. arm := AST.MakeNode(AST.NkCaseArm);
+ 1886                                             AST.SetOp(arm, 1);
+ 1887                                             AST.SetChild(arm, 0, astStmt);
+ 1888                                             AST.SetChild(astNode,
+ 1889                                               AST.NChild(astNode), arm); .) ]
+ 1890        "END"                             (. astStmt := astNode;
+ 1891                                             QbeGen.EmitLabel(lEnd); .) .
+ 1892    (* Compare-chain lowering: each alternative ends its match-tests
+ 1893       with "jmp lAfter", so the no-match fallthrough skips the body:
+ 1894       "cmp; jnz(lBody,lF); lF: ... ; jmp lAfter; lBody: S; jmp lEnd;
+ 1895       lAfter:". Falls into the next alternative, ELSE, or END. *)
+ 1896    CaseAlt<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
+ 1897            lEnd: QbeGen.QVal; cnode: AST.Node>
+ 1898                                          (. VAR lBody, lAfter: QbeGen.QVal;
+ 1899                                               arm: AST.Node; .)
+ 1900      =                                   (. arm := AST.MakeNode(AST.NkCaseArm);
+ 1901                                             QbeGen.NewLabel(lBody);
+ 1902                                             QbeGen.NewLabel(lAfter); .)
+ 1903        CaseLabel<tsel, qsel, lBody, arm>
+ 1904        { "," CaseLabel<tsel, qsel, lBody, arm> }
+ 1905        ":"                               (. astStmt := AST.NoNode;
+ 1906                                             QbeGen.Jmp(lAfter);
+ 1907                                             QbeGen.EmitLabel(lBody); .)
+ 1908        [ StatSeq ]                       (. AST.SetChild(arm, AST.NChild(arm),
+ 1909                                             astStmt);
+ 1910                                             AST.SetChild(cnode,
+ 1911                                               AST.NChild(cnode), arm);
+ 1912                                             QbeGen.Jmp(lEnd);
+ 1913                                             QbeGen.EmitLabel(lAfter); .) .
+ 1914    CaseLabel<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
+ 1915              lBody: QbeGen.QVal; arm: AST.Node>
+ 1916                                          (. VAR t2, t3: SymTab.TypeIndex;
+ 1917                                               q2, q3, qc, qd, qe:
+ 1918                                                 QbeGen.QVal;
+ 1919                                               astLab: AST.Node;
+ 1920                                               lNext: QbeGen.QVal; .)
+ 1921      = Expr<t2, q2> (. astLab := astCur;
+ 1922                                             IF (t2 #
+ 1923                                               SymTab.InvalidType)
+ 1924   AND (tsel #
+ 1925                                                 SymTab.InvalidType)
+ 1926   AND ((SymTab.ClassOf(t2) =
+ 1927                                                  SymTab.ClSet)
+ 1928                                                 OR (SymTab.ClassOf(tsel) =
+ 1929                                                     SymTab.ClSet)) THEN
+ 1930                                               SemError(230)
+ 1931                                             ELSIF (t2 #
+ 1932                                               SymTab.InvalidType)
+ 1933   AND (tsel #
+ 1934                                                 SymTab.InvalidType)
+ 1935   AND NOT SymTab.EqCheck(t2,
+ 1936                                                   tsel) THEN
+ 1937                                               SemError(213) END;
+ 1938                                             IF NOT QbeGen.IsImm(q2) THEN
+ 1939                                               SemError(230);
+ 1940                                               QbeGen.CopyOp("0", q2)
+ 1941                                             END;
+ 1942                                             QbeGen.NewLabel(lNext);
+ 1943                                             QbeGen.Cmp(SymTab.OpEq,
+ 1944                                               qsel, q2, qc, FALSE);
+ 1945                                             QbeGen.Jnz(qc, lBody, lNext);
+ 1946                                             QbeGen.EmitLabel(lNext); .)
+ 1947        [ ".." Expr<t3, q3>               (. astLab := AST.MakeBin(
+ 1948                                               AST.NkSubrange, 0, astLab, astCur);
+ 1949                                             IF (t3 #
+ 1950                                               SymTab.InvalidType)
+ 1951   AND (tsel #
+ 1952                                                 SymTab.InvalidType)
+ 1953   AND NOT SymTab.EqCheck(t3,
+ 1954                                                   tsel) THEN
+ 1955                                               SemError(213) END;
+ 1956                                             IF NOT QbeGen.IsImm(q3) THEN
+ 1957                                               SemError(230);
+ 1958                                               QbeGen.CopyOp("0", q3)
+ 1959                                             END;
+ 1960                                             QbeGen.Cmp(SymTab.OpGe,
+ 1961                                               qsel, q2, qc, FALSE);
+ 1962                                             QbeGen.Cmp(SymTab.OpLe,
+ 1963                                               qsel, q3, qd, FALSE);
+ 1964                                             QbeGen.NewTemp(qe);
+ 1965                                             QbeGen.Op3("and", qe, qc, qd,
+ 1966                                               FALSE);
+ 1967                                             QbeGen.NewLabel(lNext);
+ 1968                                             QbeGen.Jnz(qe, lBody, lNext);
+ 1969                                             QbeGen.EmitLabel(lNext); .) ]
+ 1970                                          (. AST.SetChild(arm,
+ 1971                                               AST.NChild(arm), astLab); .) .
+ 1972    ReturnStat                            (. VAR t: SymTab.TypeIndex;
+ 1973                                               q, qt: QbeGen.QVal;
+ 1974                                               res: SymTab.TypeIndex;
+ 1975                                               hadE, conv: BOOLEAN;
+ 1976                                               astVal, astNode: AST.Node; .)
+ 1977      = "RETURN"                          (. hadE := FALSE; astStmt := AST.NoNode; .)
+ 1978        [ Expr<t, q> (. hadE := TRUE; astVal := astCur; .) ]
+ 1979                                          (. astNode := AST.MakeNode(AST.NkReturn);
+ 1980                                             IF hadE THEN
+ 1981                                               AST.SetChild(astNode, 0, astVal)
+ 1982                                             END;
+ 1983                                             astStmt := astNode;
+ 1984                                             conv := FALSE;
+ 1985                                             IF NOT SymTab.InProc() THEN
+ 1986                                               SemError(232)
+ 1987                                             ELSE res := SymTab.CurRes();
+ 1988                                               IF NOT hadE THEN
+ 1989                                                 IF res #
+ 1990                                                    SymTab.InvalidType THEN
+ 1991                                                   SemError(232)
+ 1992                                                 ELSE QbeGen.EmitRet(q,
+ 1993                                                   FALSE)
  1994                                                 END
- 1995                                               END
- 1996                                             END; .) .
- 1997    HaltStat                              (. VAR t: SymTab.TypeIndex;
- 1998                                               q: QbeGen.QVal;
- 1999                                               astVal, astNode: AST.Node; .)
- 2000      = "HALT" (. astVal := AST.NoNode; .)
- 2001        [ "(" Expr<t, q> (. astVal := astCur; .) ")" ]
- 2002                                          (. astNode := AST.MakeNode(AST.NkHalt);
- 2003                                             IF astVal # AST.NoNode THEN
- 2004                                               AST.SetChild(astNode, 0, astVal)
- 2005                                             END;
- 2006                                             astStmt := astNode;
- 2007                                             QbeGen.HaltQ; .) .
- 2008    (* Designator: scalar loads, array addresses, and index suffixes.
- 2009       Each index descends one level (bounds-checked, trap on breach);
- 2010       nested levels reload the inner descriptor address. q ends as the
- 2011       value (scalars), the descriptor address (plain arrays), or the
- 2012       element address (indexed); sfx marks the indexed form. *)
- 2013    Design<VAR t: SymTab.TypeIndex; VAR k: INTEGER;
- 2014           VAR q: QbeGen.QVal; VAR qn: SymTab.Name; VAR sfx: BOOLEAN>
- 2015                                          (. VAR n, fn, mal: SymTab.Name;
- 2016                                               cls: INTEGER;
- 2017                                               ic: SymTab.TypeIndex;
- 2018                                               curT, it, eT, bt:
- 2019                                                 SymTab.TypeIndex;
- 2020                                               iq, ql, qlo, qhi, qe:
- 2021                                                 QbeGen.QVal;
- 2022                                               lo, hi: INTEGER;
- 2023                                               fo: INTEGER;
- 2024                                               isOpen: BOOLEAN;
- 2025                                               qb, cv: QbeGen.QVal;
- 2026                                               fid, fref, slot: INTEGER;
- 2027                                               r: BOOLEAN;
- 2028                                                astDes, astSel: AST.Node; .)
- 2029      = GetIdent<n>                       (. methCls := SymTab.InvalidType;
- 2030                                             QbeGen.CopyOp(n, qn);
- 2031                                             sfx := FALSE;
- 2032                                             fid := 0; fref := 0; slot := 0;
- 2033                                             IF NOT SymTab.Lookup(n) THEN
- 2034                                               (* a bare method name inside
- 2035                                                  a CLASS IMPLEMENTATION
- 2036                                                  is a sibling call on
- 2037                                                  THIS *)
- 2038                                               ic := SymTab.CurImplClass();
- 2039                                               IF (ic #
- 2040                                                  SymTab.InvalidType)
- 2041    AND SymTab.MethodExists(ic, n) THEN
- 2042                                                 sfx := FALSE;
- 2043                                                 QbeGen.ThisBase(q);
- 2044                                                 QbeGen.ArmRecv(q);
- 2045                                                 methCls := ic;
- 2046                                                 k := SymTab.KindProc;
- 2047                                                 t := SymTab.InvalidType
- 2048                                               ELSIF SymTab.InProc() THEN
- 2049                                                 (* not declared yet: a
- 2050                                                    forward reference to a
- 2051                                                    module-level variable
- 2052                                                    declared further down. *)
- 2053                                                 k := SymTab.KindVar;
- 2054                                                 r := SymTab.FwdVarRef(n, k,
- 2055                                                   fref, t);
- 2056                                                 slot := QbeGen.FwdDesignator();
- 2057                                                 FwdVarNote(fref, slot);
- 2058                                                 fid := slot;
- 2059                                                 QbeGen.FwdAddrOper(fid, q);
- 2060                                                 sfx := TRUE
- 2061                                               ELSE
- 2062                                                 SemError(201);
- 2063                                                 t :=
- 2064                                                   SymTab.InvalidType;
- 2065                                                 k := -1;
- 2066                                                 QbeGen.CopyOp("0", q)
- 2067                                               END
- 2068                                             ELSE
- 2069                                               t := SymTab.SymType(n);
- 2070                                               k := SymTab.SymKind(n);
- 2071                                               IF k = SymTab.KindConst THEN
- 2072                                                 IF SymTab.Equal(n,
- 2073                                                    "TRUE") THEN
- 2074                                                   t := SymTab.BoolType();
- 2075                                                   QbeGen.CopyOp("1", q)
- 2076                                                 ELSIF SymTab.Equal(n,
- 2077                                                    "FALSE") THEN
- 2078                                                   t := SymTab.BoolType();
- 2079                                                   QbeGen.CopyOp("0", q)
- 2080                                                 ELSIF SymTab.Equal(n,
- 2081                                                    "NIL") THEN
- 2082                                                   QbeGen.CopyOp("0", q)
- 2083                                                 ELSE
- 2084                                                   cls :=
- 2085                                                     SymTab.ClassOf(t);
- 2086                                                   IF (t #
- 2087                                                       SymTab.InvalidType)
- 2088   AND ((cls = SymTab.ClInt)
- 2089                                                      OR (cls
- 2090                                                          = SymTab.ClChar)
- 2091                                                      OR (cls
- 2092                                                          = SymTab.ClEnum)
- 2093                                                      OR (cls
- 2094                                                          = SymTab.ClReal)
- 2095                                                      OR (cls
- 2096                                                          = SymTab.ClLong)
- 2097                                                      OR (cls
- 2098                                                          = SymTab.ClNil)) THEN
- 2099                                                     IF cls = SymTab.ClNil THEN
- 2100                                                       QbeGen.CopyOp("0", q)
- 2101                                                     ELSIF ((cls
- 2102                                                         = SymTab.ClInt)
- 2103                                                       OR (cls
- 2104                                                         = SymTab.ClChar)
- 2105                                                       OR (cls
- 2106                                                         = SymTab.ClEnum)
- 2107                                                       OR (cls
- 2108                                                         = SymTab.ClLong))
- 2109    AND SymTab.GetSymVal(n, cv)
- 2110    AND QbeGen.IsImm(cv) THEN
- 2111                                                       QbeGen.CopyOp(cv, q)
- 2112                                                     ELSE
- 2113                                                       QbeGen.LoadVar(n,
- 2114                                                         cls = SymTab.ClReal,
- 2115                                                         q)
- 2116                                                     END
- 2117                                                   ELSIF (cls = SymTab.ClArray)
- 2118                                                      OR (cls = SymTab.ClRecord)
- 2119                                                      OR (cls = SymTab.ClClass)
- 2120                                                      OR (cls = SymTab.ClStr)
- 2121                                                      OR (cls = SymTab.ClUStr) THEN
- 2122                                                     (* aggregate constant:
- 2123                                                        its value IS the
- 2124                                                        descriptor address *)
- 2125                                                     IF SymTab.GetSymVal(n, cv) THEN
- 2126                                                       QbeGen.CopyOp(cv, q)
- 2127                                                     ELSE
- 2128                                                       QbeGen.CopyOp("0", q)
- 2129                                                     END
- 2130                                                   ELSE
- 2131                                                     IF t #
- 2132                                                        SymTab.InvalidType THEN
- 2133                                                       SemError(230)
- 2134                                                     END;
- 2135                                                     QbeGen.CopyOp("0", q)
- 2136                                                   END
- 2137                                                 END
- 2138                                               ELSIF (k = SymTab.KindVar)
- 2139                                                  OR (k = SymTab.KindParam) THEN
- 2140                                                 cls :=
- 2141                                                   SymTab.ClassOf(t);
- 2142                                                 IF (cls = SymTab.ClInt)
- 2143                                                    OR (cls = SymTab.ClBool)
- 2144                                                    OR (cls = SymTab.ClChar)
- 2145                                                    OR (cls = SymTab.ClUChar)
- 2146                                                    OR (cls = SymTab.ClEnum)
- 2147                                                    OR (cls
- 2148                                                        = SymTab.ClReal) THEN
- 2149                                                   QbeGen.LoadVar(n,
- 2150                                                     cls = SymTab.ClReal, q)
- 2151                                                 ELSIF (cls = SymTab.ClPtr)
- 2152                                                    OR (cls = SymTab.ClProc) THEN
- 2153                                                   QbeGen.LoadPtr(n, q)
- 2154                                                 ELSIF cls = SymTab.ClLong THEN
- 2155                                                   QbeGen.LoadLong(n, q)
- 2156                                                 ELSIF (cls
- 2157                                                         = SymTab.ClArray)
- 2158                                                    OR (cls
- 2159                                                        = SymTab.ClSet)
- 2160                                                    OR (cls
- 2161                                                        = SymTab.ClRecord)
- 2162                                                    OR (cls
- 2163                                                        = SymTab.ClUStr)
- 2164                                                    OR (cls
- 2165                                                        = SymTab.ClClass) THEN
- 2166                                                   QbeGen.AddrOf(n, q)
- 2167                                                 ELSE SemError(230);
- 2168                                                   QbeGen.CopyOp("0", q)
- 2169                                                 END
- 2170                                               ELSE QbeGen.CopyOp("0", q);
- 2171                                                 IF k = SymTab.KindImport THEN
- 2172                                                   SemError(230)
- 2173                                                 ELSIF k =
- 2174                                                    SymTab.KindProc THEN
- 2175                                                   (* bare procedure name:
- 2176                                                      a following ArgList
- 2177                                                      makes it a call;
- 2178                                                      otherwise Fact
- 2179                                                      reports 230 *)
- 2180                                                 ELSE
- 2181                                                   IF k = SymTab.KindField THEN
- 2182                                                     IF QbeGen.TopWith(qb) THEN
- 2183                                                       fo :=
- 2184                                                         SymTab.FieldOffset(
- 2185                                                         SymTab.FieldOwner(n),
- 2186                                                         n);
- 2187                                                       QbeGen.FieldAddr(qb,
- 2188                                                         fo, q);
- 2189                                                       sfx := TRUE
- 2190                                                     ELSE SemError(230);
- 2191                                                       QbeGen.CopyOp("0", q)
- 2192                                                     END
- 2193                                                   END
- 2194                                                 END
- 2195                                               END
- 2196                                             END; .)
- 2197        (. astDes := AST.MakeNode(AST.NkDesignator);
- 2198           AST.SetChild(astDes, AST.NChild(astDes), AST.MakeLeaf(AST.NkIdent, n)); .)
- 2199        { "[" Expr<it, iq>
- 2200                                          (. AST.SetChild(astDes, AST.NChild(astDes),
- 2201               AST.MakeUn(AST.NkSelector, AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
- 2202                                             ELSIF SymTab.ClassOf(t) #
- 2203                                                   SymTab.ClArray THEN
- 2204                                               SemError(217);
- 2205                                               t := SymTab.InvalidType
- 2206                                             ELSIF NOT SymTab.IsIntFamily(it)
- 2207   AND (SymTab.ClassOf(it) #
- 2208                                                   SymTab.ClChar)
- 2209   AND (SymTab.ClassOf(it) #
- 2210                                                   SymTab.ClEnum) THEN
- 2211                                               SemError(218);
- 2212                                               t := SymTab.InvalidType
- 2213                                             ELSE
- 2214                                               QbeGen.WidenIndex(iq, ql);
- 2215                                               isOpen :=
- 2216                                                 SymTab.IsOpenArray(t);
- 2217                                               IF isOpen THEN
- 2218                                                 QbeGen.CopyOp("0", qlo);
- 2219                                                 IF SymTab.IsCharArray(t)
- 2220    OR SymTab.IsUCharArray(t) THEN
- 2221                                                   QbeGen.OpenHiChar(q, qhi)
- 2222                                                 ELSE QbeGen.OpenHi(q, qhi)
- 2223                                                 END
- 2224                                               ELSE
- 2225                                                 lo := SymTab.ArrayLo(t);
- 2226                                                 hi := SymTab.ArrayHi(t);
- 2227                                                 IF SymTab.IsCharArray(t)
- 2228    OR SymTab.IsUCharArray(t) THEN
- 2229                                                   hi := hi + 1
- 2230                                                 END;
- 2231                                                 QbeGen.IntStr(lo, qlo);
- 2232                                                 QbeGen.IntStr(hi, qhi)
- 2233                                               END;
- 2234                                               QbeGen.CheckRange(ql, qlo,
- 2235                                                 qhi);
- 2236                                               eT := SymTab.ArrayElem(t);
- 2237                                               QbeGen.ElemAddr(q, ql, qlo,
- 2238                                                 t, qe);
- 2239                                               IF SymTab.ClassOf(eT) =
- 2240                                                  SymTab.ClArray THEN
- 2241                                                 QbeGen.ElemLoad(qe, eT, q)
- 2242                                               ELSE QbeGen.CopyOp(qe, q)
- 2243                                               END;
- 2244                                               t := eT; sfx := TRUE
- 2245                                             END; .)
- 2246          { "," Expr<it, iq>
- 2247                                          (. AST.SetChild(astDes, AST.NChild(astDes),
- 2248               AST.MakeUn(AST.NkSelector, AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
- 2249                                             ELSIF SymTab.ClassOf(t) #
- 2250                                                   SymTab.ClArray THEN
- 2251                                               SemError(217);
- 2252                                               t := SymTab.InvalidType
- 2253                                             ELSIF NOT SymTab.IsIntFamily(it)
- 2254   AND (SymTab.ClassOf(it) #
- 2255                                                   SymTab.ClChar)
- 2256   AND (SymTab.ClassOf(it) #
- 2257                                                   SymTab.ClEnum) THEN
- 2258                                               SemError(218);
- 2259                                               t := SymTab.InvalidType
- 2260                                             ELSE
- 2261                                               QbeGen.WidenIndex(iq, ql);
- 2262                                               isOpen :=
- 2263                                                 SymTab.IsOpenArray(t);
- 2264                                               IF isOpen THEN
- 2265                                                 QbeGen.CopyOp("0", qlo);
- 2266                                                 IF SymTab.IsCharArray(t)
- 2267    OR SymTab.IsUCharArray(t) THEN
- 2268                                                   QbeGen.OpenHiChar(q, qhi)
- 2269                                                 ELSE QbeGen.OpenHi(q, qhi)
- 2270                                                 END
- 2271                                               ELSE
- 2272                                                 lo := SymTab.ArrayLo(t);
- 2273                                                 hi := SymTab.ArrayHi(t);
- 2274                                                 IF SymTab.IsCharArray(t)
- 2275    OR SymTab.IsUCharArray(t) THEN
- 2276                                                   hi := hi + 1
- 2277                                                 END;
- 2278                                                 QbeGen.IntStr(lo, qlo);
- 2279                                                 QbeGen.IntStr(hi, qhi)
- 2280                                               END;
- 2281                                               QbeGen.CheckRange(ql, qlo,
- 2282                                                 qhi);
- 2283                                               eT := SymTab.ArrayElem(t);
- 2284                                               QbeGen.ElemAddr(q, ql, qlo,
- 2285                                                 t, qe);
- 2286                                               IF SymTab.ClassOf(eT) =
- 2287                                                  SymTab.ClArray THEN
- 2288                                                 QbeGen.ElemLoad(qe, eT, q)
- 2289                                               ELSE QbeGen.CopyOp(qe, q)
- 2290                                               END;
- 2291                                               t := eT; sfx := TRUE
- 2292                                             END; .) }
- 2293          "]"
- 2294        | "." GetIdent<fn>
- 2295                                          (. astSel := AST.MakeNode(AST.NkSelector);
- 2296               AST.SetOp(astSel, AST.SelField);
- 2297               AST.SetChild(astSel, 0, AST.MakeLeaf(AST.NkIdent, fn));
- 2298               AST.SetChild(astDes, AST.NChild(astDes), astSel); IF k = SymTab.KindModule THEN
- 2299                                               (* qualified L.x: materialize
- 2300                                                  the export, then load it *)
- 2301                                               IF NOT SymTab.MaterializeAlias(n,
- 2302                                                    fn, mal) THEN
- 2303                                                 SemError(201);
- 2304                                                 t := SymTab.InvalidType;
- 2305                                                 QbeGen.CopyOp("0", q)
- 2306                                               ELSE
- 2307                                                 QbeGen.CopyOp(mal, qn);
- 2308                                                 t := SymTab.SymType(mal);
- 2309                                                 k := SymTab.SymKind(mal);
- 2310                                                 sfx := FALSE;
- 2311                                                 IF k = SymTab.KindProc THEN
- 2312                                                   (* call: ArgList supplies
- 2313                                                      the value *)
- 2314                                                   QbeGen.CopyOp("0", q)
- 2315                                                 ELSIF NOT QbeGen.LoadDesignator(
- 2316                                                      mal, t, k, q) THEN
- 2317                                                   SemError(230);
- 2318                                                   QbeGen.CopyOp("0", q)
- 2319                                                 END
- 2320                                               END
- 2321                                             ELSIF t = SymTab.InvalidType THEN
- 2322                                             ELSIF (SymTab.ClassOf(t) #
- 2323                                                    SymTab.ClRecord)
- 2324   AND (SymTab.ClassOf(t) #
- 2325                                                   SymTab.ClClass) THEN
- 2326                                               SemError(215);
- 2327                                               t := SymTab.InvalidType
- 2328                                             ELSIF (SymTab.ClassOf(t) =
- 2329                                                    SymTab.ClClass)
- 2330    AND SymTab.MethodExists(t, fn) THEN
- 2331                                               (* obj.Method: bind the
- 2332                                                  method and pass obj as
- 2333                                                  the hidden receiver; q
- 2334                                                  already holds the
- 2335                                                  object's address *)
- 2336                                               QbeGen.ArmRecv(q);
- 2337                                               QbeGen.CopyOp(fn, n);
- 2338                                               QbeGen.CopyOp(fn, qn);
- 2339                                               methCls := t;
- 2340                                               k := SymTab.KindProc;
- 2341                                               t := SymTab.InvalidType
- 2342                                             ELSIF NOT SymTab.FieldExists(t,
- 2343                                                      fn) THEN
- 2344                                               SemError(216);
- 2345                                               t := SymTab.InvalidType
- 2346                                             ELSE
- 2347                                               fo := SymTab.FieldOffset(t,
- 2348                                                 fn);
- 2349                                               t := SymTab.FieldType(t, fn);
- 2350                                               QbeGen.FieldAddr(q, fo, qe);
- 2351                                               (* array fields are inline:
- 2352                                                  the field address is the
- 2353                                                  descriptor, like records *)
- 2354                                               QbeGen.CopyOp(qe, q);
- 2355                                               sfx := TRUE
- 2356                                             END; .)
- 2357        | "^"
- 2358                                          (. astSel := AST.MakeNode(AST.NkSelector);
- 2359               AST.SetOp(astSel, AST.SelDeref);
- 2360               AST.SetChild(astDes, AST.NChild(astDes), astSel); IF t = SymTab.InvalidType THEN
- 2361                                             ELSIF SymTab.ClassOf(t) #
- 2362                                                   SymTab.ClPtr THEN
- 2363                                               SemError(219);
- 2364                                               t := SymTab.InvalidType
- 2365                                             ELSE
- 2366                                               bt := SymTab.PtrBase(t);
- 2367                                               IF bt = SymTab.InvalidType THEN
- 2368                                               ELSE
- 2369                                                 IF sfx THEN
- 2370                                                   QbeGen.ElemLoad(q, t,
- 2371                                                     qb);
- 2372                                                   QbeGen.CopyOp(qb, q)
- 2373                                                 END;
- 2374                                                 t := bt;
- 2375                                                 (* q holds the pointee
- 2376                                                    address: Fact loads
- 2377                                                    scalars/pointers and uses
- 2378                                                    the address for
- 2379                                                    aggregates; the VAR-actual
- 2380                                                    note is q itself. *)
- 2381                                                 sfx := TRUE
- 2382                                               END
- 2383                                             END; .) } (. astCur := astDes; .) .
- 2384    (* Result suffix (ISO component after a function call): `F()^`,
- 2385       `F()[i]`, `F().field`.  The call result is in t/q with sfx FALSE
- 2386       (a value, or a descriptor address for aggregates); each component
- 2387       descends one level exactly like the Design components. *)
- 2388    ResultComp<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
- 2389               VAR sfx: BOOLEAN>          (. VAR it, eT, bt: SymTab.TypeIndex;
- 2390                                               iq, ql, qlo, qhi, qe, qb:
- 2391                                                 QbeGen.QVal;
- 2392                                               lo, hi, fo: INTEGER;
- 2393                                               isOpen: BOOLEAN;
- 2394                                               fname: SymTab.Name; .)
- 2395      = "[" Expr<it, iq>
- 2396                                          (. IF t = SymTab.InvalidType THEN
- 2397                                             ELSIF SymTab.ClassOf(t) #
- 2398                                                   SymTab.ClArray THEN
- 2399                                               SemError(217);
- 2400                                               t := SymTab.InvalidType
- 2401                                             ELSIF NOT SymTab.IsIntFamily(it)
- 2402    AND (SymTab.ClassOf(it) # SymTab.ClChar)
- 2403    AND (SymTab.ClassOf(it) # SymTab.ClEnum) THEN
- 2404                                               SemError(218);
- 2405                                               t := SymTab.InvalidType
- 2406                                             ELSE
- 2407                                               QbeGen.WidenIndex(iq, ql);
- 2408                                               isOpen :=
- 2409                                                 SymTab.IsOpenArray(t);
- 2410                                               IF isOpen THEN
- 2411                                                 QbeGen.CopyOp("0", qlo);
- 2412                                                 IF SymTab.IsCharArray(t)
- 2413    OR SymTab.IsUCharArray(t) THEN
- 2414                                                   QbeGen.OpenHiChar(q, qhi)
- 2415                                                 ELSE QbeGen.OpenHi(q, qhi)
- 2416                                                 END
- 2417                                               ELSE
- 2418                                                 lo := SymTab.ArrayLo(t);
- 2419                                                 hi := SymTab.ArrayHi(t);
- 2420                                                 IF SymTab.IsCharArray(t)
- 2421    OR SymTab.IsUCharArray(t) THEN
- 2422                                                   hi := hi + 1
- 2423                                                 END;
- 2424                                                 QbeGen.IntStr(lo, qlo);
- 2425                                                 QbeGen.IntStr(hi, qhi)
- 2426                                               END;
- 2427                                               QbeGen.CheckRange(ql, qlo,
- 2428                                                 qhi);
- 2429                                               eT := SymTab.ArrayElem(t);
- 2430                                               QbeGen.ElemAddr(q, ql, qlo,
- 2431                                                 t, qe);
- 2432                                               IF SymTab.ClassOf(eT) =
- 2433                                                  SymTab.ClArray THEN
- 2434                                                 QbeGen.ElemLoad(qe, eT, q)
- 2435                                               ELSE QbeGen.CopyOp(qe, q)
- 2436                                               END;
- 2437                                               t := eT; sfx := TRUE
- 2438                                             END; .)
- 2439        "]"
- 2440      | "." GetIdent<fname>
- 2441                                          (. IF t = SymTab.InvalidType THEN
- 2442                                             ELSIF (SymTab.ClassOf(t) #
- 2443                                                    SymTab.ClRecord)
- 2444    AND (SymTab.ClassOf(t) # SymTab.ClClass) THEN
- 2445                                               SemError(215);
- 2446                                               t := SymTab.InvalidType
- 2447                                             ELSIF NOT SymTab.FieldExists(t,
- 2448                                                      fname) THEN
- 2449                                               SemError(216);
- 2450                                               t := SymTab.InvalidType
- 2451                                             ELSE
- 2452                                               fo := SymTab.FieldOffset(t,
- 2453                                                 fname);
- 2454                                               t := SymTab.FieldType(t, fname);
- 2455                                               QbeGen.FieldAddr(q, fo, qe);
- 2456                                               QbeGen.CopyOp(qe, q);
- 2457                                               sfx := TRUE
- 2458                                             END; .)
- 2459      | "^"                               (. IF t = SymTab.InvalidType THEN
- 2460                                             ELSIF SymTab.ClassOf(t) #
- 2461                                                   SymTab.ClPtr THEN
- 2462                                               SemError(219);
- 2463                                               t := SymTab.InvalidType
- 2464                                             ELSE
- 2465                                               bt := SymTab.PtrBase(t);
- 2466                                               IF bt # SymTab.InvalidType THEN
- 2467                                                 IF sfx THEN
- 2468                                                   QbeGen.ElemLoad(q, t, qb);
- 2469                                                   QbeGen.CopyOp(qb, q)
- 2470                                                 END;
- 2471                                                 t := bt; sfx := TRUE
- 2472                                               END
- 2473                                             END; .) .
- 2474    Expr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2475                                          (. VAR t2: SymTab.TypeIndex;
- 2476                                               op: INTEGER;
- 2477                                               q2, qt, wl: QbeGen.QVal;
- 2478                                                astA, astB: AST.Node;
- 2479                                                astOp: INTEGER;
- 2480                                                astMade: BOOLEAN;
- 2481                                               isR: BOOLEAN; .)
- 2482      = SimExpr<t, q>                     (. astA := astCur; astMade := FALSE; .)
- 2483        [ Rel<op> SimExpr<t2, q2>
- 2484          (. astB := astCur; astMade := TRUE;
- 2485              astOp := AST.OpEq;
- 2486              IF op = SymTab.OpNeq1 THEN astOp := AST.OpNe
- 2487              ELSIF op = SymTab.OpNeq2 THEN astOp := AST.OpNe
- 2488              ELSIF op = SymTab.OpLt THEN astOp := AST.OpLt
- 2489              ELSIF op = SymTab.OpLe THEN astOp := AST.OpLe
- 2490              ELSIF op = SymTab.OpGt THEN astOp := AST.OpGt
- 2491              ELSIF op = SymTab.OpGe THEN astOp := AST.OpGe
- 2492              ELSIF op = SymTab.OpIn THEN astOp := AST.OpIn
- 2493              END;
- 2494              IF op = SymTab.OpIn THEN
- 2495               IF SymTab.InCheck(t, t2) THEN
- 2496                 IF (t = SymTab.InvalidType)
- 2497                    OR (t2 = SymTab.InvalidType) THEN
- 2498                   t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
- 2499                 ELSE
- 2500                   QbeGen.InSet(q, q2, SymTab.SetBaseLo(t2),
- 2501                     SymTab.SetCount(t2), qt);
- 2502                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2503                 END
- 2504               ELSE SemError(222); t := SymTab.InvalidType;
- 2505                 QbeGen.CopyOp("0", q)
- 2506               END
- 2507             ELSIF SymTab.RelCheck(t, t2, op) THEN
- 2508               IF (t = SymTab.InvalidType)
- 2509                  OR (t2 = SymTab.InvalidType) THEN
- 2510                 t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
- 2511               ELSIF (SymTab.ClassOf(t) = SymTab.ClPtr)
- 2512                  OR (SymTab.ClassOf(t2) = SymTab.ClPtr) THEN
- 2513                 IF SymTab.IsFwdVar(t) OR SymTab.IsFwdVar(t2) THEN
- 2514                   QbeGen.Cmp(op, q, q2, qt, FALSE);
- 2515                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2516                 ELSIF (op # SymTab.OpEq) AND (op # SymTab.OpNeq1)
- 2517   AND (op # SymTab.OpNeq2) THEN
- 2518                   SemError(213); t := SymTab.InvalidType;
- 2519                   QbeGen.CopyOp("0", q)
- 2520                 ELSE
- 2521                   QbeGen.CmpL(op, q, q2, qt);
- 2522                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2523                 END
- 2524               ELSIF (SymTab.ClassOf(t) = SymTab.ClSet)
- 2525                  OR (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2526                 QbeGen.CmpSet(op, q, q2,
- 2527                   SymTab.SetWords(t), SymTab.SetWords(t2), qt);
- 2528                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2529               ELSIF SymTab.StrCompat(t, t2) THEN
- 2530                 QbeGen.StrEq(op, q, q2, qt);
- 2531                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2532               ELSIF SymTab.IsLongFamily(t)
- 2533                  OR SymTab.IsLongFamily(t2) THEN
- 2534                 IF SymTab.IsIntFamily(t) THEN
- 2535                   QbeGen.WidenLong(q, wl); QbeGen.CopyOp(wl, q)
- 2536                 END;
- 2537                 IF SymTab.IsIntFamily(t2) THEN
- 2538                   QbeGen.WidenLong(q2, wl); QbeGen.CopyOp(wl, q2)
- 2539                 END;
- 2540                 QbeGen.CmpLong(op, q, q2, qt);
- 2541                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2542               ELSE
- 2543                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2544                 t := SymTab.BoolType();
- 2545                 QbeGen.Cmp(op, q, q2, qt, isR);
- 2546                 QbeGen.CopyOp(qt, q)
- 2547               END
- 2548             ELSE SemError(213); t := SymTab.InvalidType;
- 2549                QbeGen.CopyOp("0", q)
- 2550              END;
- 2551              astCur := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB); .) ]
- 2552         (. IF NOT astMade THEN astCur := astA END; .) .
- 2553    Rel<VAR op: INTEGER>
- 2554      = "="                               (. op := SymTab.OpEq; .)
- 2555      | "#"                               (. op := SymTab.OpNeq1; .)
- 2556      | "<"                               (. op := SymTab.OpLt; .)
- 2557      | "<="                              (. op := SymTab.OpLe; .)
- 2558      | ">"                               (. op := SymTab.OpGt; .)
- 2559      | ">="                              (. op := SymTab.OpGe; .)
- 2560      | "IN"                              (. op := SymTab.OpIn; .) .
- 2561    SimExpr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2562                                          (. VAR t2, res2, lt, rt:
- 2563                                                 SymTab.TypeIndex;
- 2564                                               op: INTEGER;
- 2565                                               q2, qt, wq, qf, q2a, q2b:
- 2566                                                 QbeGen.QVal;
- 2567                                               neg, isR, isL, folded:
- 2568                                                 BOOLEAN;
- 2569                                               fok: BOOLEAN;
- 2570                                               lw, rw, mw: CARDINAL;
- 2571                                               lTrue, lNext, lDone, qr, qs: QbeGen.QVal;
- 2572                                                astA, astB: AST.Node;
- 2573                                                astSign, astOp: INTEGER; .)
- 2574      =                                   (. neg := FALSE; astSign := 0; .)
- 2575        [ "+"                         (. neg := TRUE; astSign := 1; .)
- 2576        | "-"                         (. neg := TRUE; astSign := -1; .) ]
- 2577        Term<t, q> (. astA := astCur; IF neg THEN
- 2578                                             IF QbeGen.IsImm(q) THEN
- 2579                                               QbeGen.NegFold(q, q)
- 2580                                             ELSE QbeGen.NewTemp(qt);
- 2581                                               QbeGen.NegQ(q, qt,
- 2582                                                 SymTab.ClassOf(t)
- 2583                                                 = SymTab.ClReal);
- 2584                                               QbeGen.CopyOp(qt, q)
- 2585                                             END
- 2586                                           END;
- 2587                                           IF astSign < 0 THEN
- 2588                                             astCur := AST.MakeUn(
- 2589                                               AST.NkUnary, AST.OpSub, astA);
- 2590                                             astA := astCur
- 2591                                           END; .)
- 2592        { AddOp<op>                       (. IF op = SymTab.OpOr THEN
- 2593                                               QbeGen.DelayBegin END; .)
- 2594          Term<t2, q2> (. astB := astCur; IF op = SymTab.OpOr THEN
- 2595                                               QbeGen.DelayEnd END; .)
- 2596          (. astOp := AST.OpAdd;
- 2597             IF op = SymTab.OpSub THEN astOp := AST.OpSub
- 2598             ELSIF op = SymTab.OpOr THEN astOp := AST.OpOr END;
- 2599             astA := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB);
- 2600             astCur := astA;
- 2601             IF op = SymTab.OpOr THEN
- 2602               (* short-circuit: if q is true the RHS is skipped *)
- 2603               IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
- 2604                 t := SymTab.BoolType()
- 2605               ELSE SemError(212); t := SymTab.InvalidType END;
- 2606               IF t # SymTab.InvalidType THEN
- 2607                 QbeGen.Slot4(qs);
- 2608                 QbeGen.NewLabel(lTrue);
- 2609                 QbeGen.NewLabel(lNext);
- 2610                 QbeGen.NewLabel(lDone);
- 2611                 QbeGen.Jnz(q, lTrue, lNext);
- 2612                 QbeGen.EmitLabel(lTrue);
- 2613                 QbeGen.StoreW(qs, "1");
- 2614                 QbeGen.Jmp(lDone);
- 2615                 QbeGen.EmitLabel(lNext);
- 2616                 QbeGen.DelayFlush;
- 2617                 QbeGen.StoreW(qs, q2);
- 2618                 QbeGen.Jmp(lDone);
- 2619                 QbeGen.EmitLabel(lDone);
- 2620                 QbeGen.LoadW(qs, qr);
- 2621                 QbeGen.CopyOp(qr, q)
- 2622               ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
- 2623               END
- 2624             ELSIF (op = SymTab.OpAdd)
- 2625               AND (SymTab.UStrCompat(t, t2)
- 2626                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
- 2627                   AND (SymTab.ClassOf(t2) = SymTab.ClUStr))
- 2628                 OR ((SymTab.ClassOf(t) = SymTab.ClUStr)
- 2629                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))
- 2630                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
- 2631                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))) THEN
- 2632               (* UString concatenation: a UCHAR operand becomes a
- 2633                  1-codepoint UString; the result is a descriptor in the
- 2634                  shim's concat buffer.  Work on copies so neither
- 2635                  operand is clobbered. *)
- 2636               IF SymTab.ClassOf(t) = SymTab.ClUStr THEN
- 2637                 QbeGen.CopyOp(q, q2a)
- 2638               ELSE
- 2639                 QbeGen.UStrFrom(q, q2a)
- 2640               END;
- 2641               IF SymTab.ClassOf(t2) = SymTab.ClUStr THEN
- 2642                 QbeGen.UStrCat(q2a, q2, qt)
- 2643               ELSE
- 2644                 QbeGen.UStrFrom(q2, q2b);
- 2645                 QbeGen.UStrCat(q2a, q2b, qt)
- 2646               END;
- 2647               t := SymTab.NewUStr();
- 2648               QbeGen.CopyOp(qt, q)
- 2649             ELSIF (op = SymTab.OpAdd)
- 2650               AND (SymTab.StrCompat(t, t2)
- 2651                 OR (SymTab.IsStrType(t)
- 2652                   AND (SymTab.ClassOf(t2) = SymTab.ClChar))
- 2653                 OR ((SymTab.ClassOf(t) = SymTab.ClChar)
- 2654                   AND SymTab.IsStrType(t2))) THEN
- 2655               (* string concatenation; a CHAR operand becomes a
- 2656                  1-character string literal.  When both operands are
- 2657                  constants, fold to a single string literal so a
- 2658                  constructor element stays compile-time. *)
- 2659               QbeGen.StrFold(q, q2, SymTab.ClassOf(t), SymTab.ClassOf(t2),
- 2660                 qt, fok);
- 2661               IF NOT fok THEN
- 2662                 IF SymTab.StrCompat(t, t2) THEN
- 2663                   QbeGen.StrCat(q, q2, qt)
- 2664                 ELSIF SymTab.IsStrType(t) THEN
- 2665                   QbeGen.DeclCharStr(q2, qs);
- 2666                   QbeGen.StrCat(q, qs, qt)
- 2667                 ELSE
- 2668                   QbeGen.DeclCharStr(q, qs);
- 2669                   QbeGen.StrCat(qs, q2, qt)
- 2670                 END
- 2671               END;
- 2672               t := SymTab.NewStr();
- 2673               QbeGen.CopyOp(qt, q)
- 2674             ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
- 2675   AND (SymTab.ClassOf(t) = SymTab.ClSet)
- 2676   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2677               lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
- 2678               mw := lw;
- 2679               IF rw > mw THEN mw := rw END;
- 2680               IF op = SymTab.OpAdd THEN
- 2681                 QbeGen.SetBinOp(0, q, q2, lw, rw, qt)
+ 1995                                               ELSIF (res =
+ 1996                                                      SymTab.InvalidType)
+ 1997                                                  OR (t #
+ 1998                                                      SymTab.InvalidType)
+ 1999   AND NOT SymTab.Assignable(t,
+ 2000                                                       res) THEN
+ 2001                                                 SemError(232)
+ 2002                                               ELSE
+ 2003                                                 conv := (SymTab.ClassOf(
+ 2004                                                   res) = SymTab.ClReal)
+ 2005   AND SymTab.IsIntFamily(t);
+ 2006                                                 IF conv THEN
+ 2007                                                   QbeGen.ConvIR(q, qt);
+ 2008                                                   QbeGen.EmitRet(qt, TRUE)
+ 2009                                                 ELSE QbeGen.EmitRet(q, TRUE)
+ 2010                                                 END
+ 2011                                               END
+ 2012                                             END; .) .
+ 2013    HaltStat                              (. VAR t: SymTab.TypeIndex;
+ 2014                                               q: QbeGen.QVal;
+ 2015                                               astVal, astNode: AST.Node; .)
+ 2016      = "HALT" (. astVal := AST.NoNode; .)
+ 2017        [ "(" Expr<t, q> (. astVal := astCur; .) ")" ]
+ 2018                                          (. astNode := AST.MakeNode(AST.NkHalt);
+ 2019                                             IF astVal # AST.NoNode THEN
+ 2020                                               AST.SetChild(astNode, 0, astVal)
+ 2021                                             END;
+ 2022                                             astStmt := astNode;
+ 2023                                             QbeGen.HaltQ; .) .
+ 2024    (* Designator: scalar loads, array addresses, and index suffixes.
+ 2025       Each index descends one level (bounds-checked, trap on breach);
+ 2026       nested levels reload the inner descriptor address. q ends as the
+ 2027       value (scalars), the descriptor address (plain arrays), or the
+ 2028       element address (indexed); sfx marks the indexed form. *)
+ 2029    Design<VAR t: SymTab.TypeIndex; VAR k: INTEGER;
+ 2030           VAR q: QbeGen.QVal; VAR qn: SymTab.Name; VAR sfx: BOOLEAN>
+ 2031                                          (. VAR n, fn, mal: SymTab.Name;
+ 2032                                               cls: INTEGER;
+ 2033                                               ic: SymTab.TypeIndex;
+ 2034                                               curT, it, eT, bt:
+ 2035                                                 SymTab.TypeIndex;
+ 2036                                               iq, ql, qlo, qhi, qe:
+ 2037                                                 QbeGen.QVal;
+ 2038                                               lo, hi: INTEGER;
+ 2039                                               fo: INTEGER;
+ 2040                                               isOpen: BOOLEAN;
+ 2041                                               qb, cv: QbeGen.QVal;
+ 2042                                               fid, fref, slot: INTEGER;
+ 2043                                               r: BOOLEAN;
+ 2044                                                astDes, astSel: AST.Node; .)
+ 2045      = GetIdent<n>                       (. methCls := SymTab.InvalidType;
+ 2046                                             QbeGen.CopyOp(n, qn);
+ 2047                                             sfx := FALSE;
+ 2048                                             fid := 0; fref := 0; slot := 0;
+ 2049                                             IF NOT SymTab.Lookup(n) THEN
+ 2050                                               (* a bare method name inside
+ 2051                                                  a CLASS IMPLEMENTATION
+ 2052                                                  is a sibling call on
+ 2053                                                  THIS *)
+ 2054                                               ic := SymTab.CurImplClass();
+ 2055                                               IF (ic #
+ 2056                                                  SymTab.InvalidType)
+ 2057    AND SymTab.MethodExists(ic, n) THEN
+ 2058                                                 sfx := FALSE;
+ 2059                                                 QbeGen.ThisBase(q);
+ 2060                                                 QbeGen.ArmRecv(q);
+ 2061                                                 methCls := ic;
+ 2062                                                 k := SymTab.KindProc;
+ 2063                                                 t := SymTab.InvalidType
+ 2064                                               ELSIF SymTab.InProc() THEN
+ 2065                                                 (* not declared yet: a
+ 2066                                                    forward reference to a
+ 2067                                                    module-level variable
+ 2068                                                    declared further down. *)
+ 2069                                                 k := SymTab.KindVar;
+ 2070                                                 r := SymTab.FwdVarRef(n, k,
+ 2071                                                   fref, t);
+ 2072                                                 slot := QbeGen.FwdDesignator();
+ 2073                                                 FwdVarNote(fref, slot);
+ 2074                                                 fid := slot;
+ 2075                                                 QbeGen.FwdAddrOper(fid, q);
+ 2076                                                 sfx := TRUE
+ 2077                                               ELSE
+ 2078                                                 SemError(201);
+ 2079                                                 t :=
+ 2080                                                   SymTab.InvalidType;
+ 2081                                                 k := -1;
+ 2082                                                 QbeGen.CopyOp("0", q)
+ 2083                                               END
+ 2084                                             ELSE
+ 2085                                               t := SymTab.SymType(n);
+ 2086                                               k := SymTab.SymKind(n);
+ 2087                                               IF k = SymTab.KindConst THEN
+ 2088                                                 IF SymTab.Equal(n,
+ 2089                                                    "TRUE") THEN
+ 2090                                                   t := SymTab.BoolType();
+ 2091                                                   QbeGen.CopyOp("1", q)
+ 2092                                                 ELSIF SymTab.Equal(n,
+ 2093                                                    "FALSE") THEN
+ 2094                                                   t := SymTab.BoolType();
+ 2095                                                   QbeGen.CopyOp("0", q)
+ 2096                                                 ELSIF SymTab.Equal(n,
+ 2097                                                    "NIL") THEN
+ 2098                                                   QbeGen.CopyOp("0", q)
+ 2099                                                 ELSE
+ 2100                                                   cls :=
+ 2101                                                     SymTab.ClassOf(t);
+ 2102                                                   IF (t #
+ 2103                                                       SymTab.InvalidType)
+ 2104   AND ((cls = SymTab.ClInt)
+ 2105                                                      OR (cls
+ 2106                                                          = SymTab.ClChar)
+ 2107                                                      OR (cls
+ 2108                                                          = SymTab.ClEnum)
+ 2109                                                      OR (cls
+ 2110                                                          = SymTab.ClReal)
+ 2111                                                      OR (cls
+ 2112                                                          = SymTab.ClLong)
+ 2113                                                      OR (cls
+ 2114                                                          = SymTab.ClNil)) THEN
+ 2115                                                     IF cls = SymTab.ClNil THEN
+ 2116                                                       QbeGen.CopyOp("0", q)
+ 2117                                                     ELSIF ((cls
+ 2118                                                         = SymTab.ClInt)
+ 2119                                                       OR (cls
+ 2120                                                         = SymTab.ClChar)
+ 2121                                                       OR (cls
+ 2122                                                         = SymTab.ClEnum)
+ 2123                                                       OR (cls
+ 2124                                                         = SymTab.ClLong))
+ 2125    AND SymTab.GetSymVal(n, cv)
+ 2126    AND QbeGen.IsImm(cv) THEN
+ 2127                                                       QbeGen.CopyOp(cv, q)
+ 2128                                                     ELSE
+ 2129                                                       QbeGen.LoadVar(n,
+ 2130                                                         cls = SymTab.ClReal,
+ 2131                                                         q)
+ 2132                                                     END
+ 2133                                                   ELSIF (cls = SymTab.ClArray)
+ 2134                                                      OR (cls = SymTab.ClRecord)
+ 2135                                                      OR (cls = SymTab.ClClass)
+ 2136                                                      OR (cls = SymTab.ClStr)
+ 2137                                                      OR (cls = SymTab.ClUStr) THEN
+ 2138                                                     (* aggregate constant:
+ 2139                                                        its value IS the
+ 2140                                                        descriptor address *)
+ 2141                                                     IF SymTab.GetSymVal(n, cv) THEN
+ 2142                                                       QbeGen.CopyOp(cv, q)
+ 2143                                                     ELSE
+ 2144                                                       QbeGen.CopyOp("0", q)
+ 2145                                                     END
+ 2146                                                   ELSE
+ 2147                                                     IF t #
+ 2148                                                        SymTab.InvalidType THEN
+ 2149                                                       SemError(230)
+ 2150                                                     END;
+ 2151                                                     QbeGen.CopyOp("0", q)
+ 2152                                                   END
+ 2153                                                 END
+ 2154                                               ELSIF (k = SymTab.KindVar)
+ 2155                                                  OR (k = SymTab.KindParam) THEN
+ 2156                                                 cls :=
+ 2157                                                   SymTab.ClassOf(t);
+ 2158                                                 IF (cls = SymTab.ClInt)
+ 2159                                                    OR (cls = SymTab.ClBool)
+ 2160                                                    OR (cls = SymTab.ClChar)
+ 2161                                                    OR (cls = SymTab.ClUChar)
+ 2162                                                    OR (cls = SymTab.ClEnum)
+ 2163                                                    OR (cls
+ 2164                                                        = SymTab.ClReal) THEN
+ 2165                                                   QbeGen.LoadVar(n,
+ 2166                                                     cls = SymTab.ClReal, q)
+ 2167                                                 ELSIF (cls = SymTab.ClPtr)
+ 2168                                                    OR (cls = SymTab.ClProc) THEN
+ 2169                                                   QbeGen.LoadPtr(n, q)
+ 2170                                                 ELSIF cls = SymTab.ClLong THEN
+ 2171                                                   QbeGen.LoadLong(n, q)
+ 2172                                                 ELSIF (cls
+ 2173                                                         = SymTab.ClArray)
+ 2174                                                    OR (cls
+ 2175                                                        = SymTab.ClSet)
+ 2176                                                    OR (cls
+ 2177                                                        = SymTab.ClRecord)
+ 2178                                                    OR (cls
+ 2179                                                        = SymTab.ClUStr)
+ 2180                                                    OR (cls
+ 2181                                                        = SymTab.ClClass) THEN
+ 2182                                                   QbeGen.AddrOf(n, q)
+ 2183                                                 ELSE SemError(230);
+ 2184                                                   QbeGen.CopyOp("0", q)
+ 2185                                                 END
+ 2186                                               ELSE QbeGen.CopyOp("0", q);
+ 2187                                                 IF k = SymTab.KindImport THEN
+ 2188                                                   SemError(230)
+ 2189                                                 ELSIF k =
+ 2190                                                    SymTab.KindProc THEN
+ 2191                                                   (* bare procedure name:
+ 2192                                                      a following ArgList
+ 2193                                                      makes it a call;
+ 2194                                                      otherwise Fact
+ 2195                                                      reports 230 *)
+ 2196                                                 ELSE
+ 2197                                                   IF k = SymTab.KindField THEN
+ 2198                                                     IF QbeGen.TopWith(qb) THEN
+ 2199                                                       fo :=
+ 2200                                                         SymTab.FieldOffset(
+ 2201                                                         SymTab.FieldOwner(n),
+ 2202                                                         n);
+ 2203                                                       QbeGen.FieldAddr(qb,
+ 2204                                                         fo, q);
+ 2205                                                       sfx := TRUE
+ 2206                                                     ELSE SemError(230);
+ 2207                                                       QbeGen.CopyOp("0", q)
+ 2208                                                     END
+ 2209                                                   END
+ 2210                                                 END
+ 2211                                               END
+ 2212                                             END; .)
+ 2213        (. astDes := AST.MakeNode(AST.NkDesignator);
+ 2214           AST.SetChild(astDes, AST.NChild(astDes), AST.MakeLeaf(AST.NkIdent, n)); .)
+ 2215        { "[" Expr<it, iq>
+ 2216                                          (. AST.SetChild(astDes, AST.NChild(astDes),
+ 2217               AST.MakeUn(AST.NkSelector, AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
+ 2218                                             ELSIF SymTab.ClassOf(t) #
+ 2219                                                   SymTab.ClArray THEN
+ 2220                                               SemError(217);
+ 2221                                               t := SymTab.InvalidType
+ 2222                                             ELSIF NOT SymTab.IsIntFamily(it)
+ 2223   AND (SymTab.ClassOf(it) #
+ 2224                                                   SymTab.ClChar)
+ 2225   AND (SymTab.ClassOf(it) #
+ 2226                                                   SymTab.ClEnum) THEN
+ 2227                                               SemError(218);
+ 2228                                               t := SymTab.InvalidType
+ 2229                                             ELSE
+ 2230                                               QbeGen.WidenIndex(iq, ql);
+ 2231                                               isOpen :=
+ 2232                                                 SymTab.IsOpenArray(t);
+ 2233                                               IF isOpen THEN
+ 2234                                                 QbeGen.CopyOp("0", qlo);
+ 2235                                                 IF SymTab.IsCharArray(t)
+ 2236    OR SymTab.IsUCharArray(t) THEN
+ 2237                                                   QbeGen.OpenHiChar(q, qhi)
+ 2238                                                 ELSE QbeGen.OpenHi(q, qhi)
+ 2239                                                 END
+ 2240                                               ELSE
+ 2241                                                 lo := SymTab.ArrayLo(t);
+ 2242                                                 hi := SymTab.ArrayHi(t);
+ 2243                                                 IF SymTab.IsCharArray(t)
+ 2244    OR SymTab.IsUCharArray(t) THEN
+ 2245                                                   hi := hi + 1
+ 2246                                                 END;
+ 2247                                                 QbeGen.IntStr(lo, qlo);
+ 2248                                                 QbeGen.IntStr(hi, qhi)
+ 2249                                               END;
+ 2250                                               QbeGen.CheckRange(ql, qlo,
+ 2251                                                 qhi);
+ 2252                                               eT := SymTab.ArrayElem(t);
+ 2253                                               QbeGen.ElemAddr(q, ql, qlo,
+ 2254                                                 t, qe);
+ 2255                                               IF SymTab.ClassOf(eT) =
+ 2256                                                  SymTab.ClArray THEN
+ 2257                                                 QbeGen.ElemLoad(qe, eT, q)
+ 2258                                               ELSE QbeGen.CopyOp(qe, q)
+ 2259                                               END;
+ 2260                                               t := eT; sfx := TRUE
+ 2261                                             END; .)
+ 2262          { "," Expr<it, iq>
+ 2263                                          (. AST.SetChild(astDes, AST.NChild(astDes),
+ 2264               AST.MakeUn(AST.NkSelector, AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
+ 2265                                             ELSIF SymTab.ClassOf(t) #
+ 2266                                                   SymTab.ClArray THEN
+ 2267                                               SemError(217);
+ 2268                                               t := SymTab.InvalidType
+ 2269                                             ELSIF NOT SymTab.IsIntFamily(it)
+ 2270   AND (SymTab.ClassOf(it) #
+ 2271                                                   SymTab.ClChar)
+ 2272   AND (SymTab.ClassOf(it) #
+ 2273                                                   SymTab.ClEnum) THEN
+ 2274                                               SemError(218);
+ 2275                                               t := SymTab.InvalidType
+ 2276                                             ELSE
+ 2277                                               QbeGen.WidenIndex(iq, ql);
+ 2278                                               isOpen :=
+ 2279                                                 SymTab.IsOpenArray(t);
+ 2280                                               IF isOpen THEN
+ 2281                                                 QbeGen.CopyOp("0", qlo);
+ 2282                                                 IF SymTab.IsCharArray(t)
+ 2283    OR SymTab.IsUCharArray(t) THEN
+ 2284                                                   QbeGen.OpenHiChar(q, qhi)
+ 2285                                                 ELSE QbeGen.OpenHi(q, qhi)
+ 2286                                                 END
+ 2287                                               ELSE
+ 2288                                                 lo := SymTab.ArrayLo(t);
+ 2289                                                 hi := SymTab.ArrayHi(t);
+ 2290                                                 IF SymTab.IsCharArray(t)
+ 2291    OR SymTab.IsUCharArray(t) THEN
+ 2292                                                   hi := hi + 1
+ 2293                                                 END;
+ 2294                                                 QbeGen.IntStr(lo, qlo);
+ 2295                                                 QbeGen.IntStr(hi, qhi)
+ 2296                                               END;
+ 2297                                               QbeGen.CheckRange(ql, qlo,
+ 2298                                                 qhi);
+ 2299                                               eT := SymTab.ArrayElem(t);
+ 2300                                               QbeGen.ElemAddr(q, ql, qlo,
+ 2301                                                 t, qe);
+ 2302                                               IF SymTab.ClassOf(eT) =
+ 2303                                                  SymTab.ClArray THEN
+ 2304                                                 QbeGen.ElemLoad(qe, eT, q)
+ 2305                                               ELSE QbeGen.CopyOp(qe, q)
+ 2306                                               END;
+ 2307                                               t := eT; sfx := TRUE
+ 2308                                             END; .) }
+ 2309          "]"
+ 2310        | "." GetIdent<fn>
+ 2311                                          (. astSel := AST.MakeNode(AST.NkSelector);
+ 2312               AST.SetOp(astSel, AST.SelField);
+ 2313               AST.SetChild(astSel, 0, AST.MakeLeaf(AST.NkIdent, fn));
+ 2314               AST.SetChild(astDes, AST.NChild(astDes), astSel); IF k = SymTab.KindModule THEN
+ 2315                                               (* qualified L.x: materialize
+ 2316                                                  the export, then load it *)
+ 2317                                               IF NOT SymTab.MaterializeAlias(n,
+ 2318                                                    fn, mal) THEN
+ 2319                                                 SemError(201);
+ 2320                                                 t := SymTab.InvalidType;
+ 2321                                                 QbeGen.CopyOp("0", q)
+ 2322                                               ELSE
+ 2323                                                 QbeGen.CopyOp(mal, qn);
+ 2324                                                 t := SymTab.SymType(mal);
+ 2325                                                 k := SymTab.SymKind(mal);
+ 2326                                                 sfx := FALSE;
+ 2327                                                 IF k = SymTab.KindProc THEN
+ 2328                                                   (* call: ArgList supplies
+ 2329                                                      the value *)
+ 2330                                                   QbeGen.CopyOp("0", q)
+ 2331                                                 ELSIF NOT QbeGen.LoadDesignator(
+ 2332                                                      mal, t, k, q) THEN
+ 2333                                                   SemError(230);
+ 2334                                                   QbeGen.CopyOp("0", q)
+ 2335                                                 END
+ 2336                                               END
+ 2337                                             ELSIF t = SymTab.InvalidType THEN
+ 2338                                             ELSIF (SymTab.ClassOf(t) #
+ 2339                                                    SymTab.ClRecord)
+ 2340   AND (SymTab.ClassOf(t) #
+ 2341                                                   SymTab.ClClass) THEN
+ 2342                                               SemError(215);
+ 2343                                               t := SymTab.InvalidType
+ 2344                                             ELSIF (SymTab.ClassOf(t) =
+ 2345                                                    SymTab.ClClass)
+ 2346    AND SymTab.MethodExists(t, fn) THEN
+ 2347                                               (* obj.Method: bind the
+ 2348                                                  method and pass obj as
+ 2349                                                  the hidden receiver; q
+ 2350                                                  already holds the
+ 2351                                                  object's address *)
+ 2352                                               QbeGen.ArmRecv(q);
+ 2353                                               QbeGen.CopyOp(fn, n);
+ 2354                                               QbeGen.CopyOp(fn, qn);
+ 2355                                               methCls := t;
+ 2356                                               k := SymTab.KindProc;
+ 2357                                               t := SymTab.InvalidType
+ 2358                                             ELSIF NOT SymTab.FieldExists(t,
+ 2359                                                      fn) THEN
+ 2360                                               SemError(216);
+ 2361                                               t := SymTab.InvalidType
+ 2362                                             ELSE
+ 2363                                               fo := SymTab.FieldOffset(t,
+ 2364                                                 fn);
+ 2365                                               t := SymTab.FieldType(t, fn);
+ 2366                                               QbeGen.FieldAddr(q, fo, qe);
+ 2367                                               (* array fields are inline:
+ 2368                                                  the field address is the
+ 2369                                                  descriptor, like records *)
+ 2370                                               QbeGen.CopyOp(qe, q);
+ 2371                                               sfx := TRUE
+ 2372                                             END; .)
+ 2373        | "^"
+ 2374                                          (. astSel := AST.MakeNode(AST.NkSelector);
+ 2375               AST.SetOp(astSel, AST.SelDeref);
+ 2376               AST.SetChild(astDes, AST.NChild(astDes), astSel); IF t = SymTab.InvalidType THEN
+ 2377                                             ELSIF SymTab.ClassOf(t) #
+ 2378                                                   SymTab.ClPtr THEN
+ 2379                                               SemError(219);
+ 2380                                               t := SymTab.InvalidType
+ 2381                                             ELSE
+ 2382                                               bt := SymTab.PtrBase(t);
+ 2383                                               IF bt = SymTab.InvalidType THEN
+ 2384                                               ELSE
+ 2385                                                 IF sfx THEN
+ 2386                                                   QbeGen.ElemLoad(q, t,
+ 2387                                                     qb);
+ 2388                                                   QbeGen.CopyOp(qb, q)
+ 2389                                                 END;
+ 2390                                                 t := bt;
+ 2391                                                 (* q holds the pointee
+ 2392                                                    address: Fact loads
+ 2393                                                    scalars/pointers and uses
+ 2394                                                    the address for
+ 2395                                                    aggregates; the VAR-actual
+ 2396                                                    note is q itself. *)
+ 2397                                                 sfx := TRUE
+ 2398                                               END
+ 2399                                             END; .) } (. astCur := astDes; .) .
+ 2400    (* Result suffix (ISO component after a function call): `F()^`,
+ 2401       `F()[i]`, `F().field`.  The call result is in t/q with sfx FALSE
+ 2402       (a value, or a descriptor address for aggregates); each component
+ 2403       descends one level exactly like the Design components. *)
+ 2404    ResultComp<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
+ 2405               VAR sfx: BOOLEAN; VAR node: AST.Node>          (. VAR it, eT, bt: SymTab.TypeIndex;
+ 2406                                               iq, ql, qlo, qhi, qe, qb:
+ 2407                                                 QbeGen.QVal;
+ 2408                                               lo, hi, fo: INTEGER;
+ 2409                                               isOpen: BOOLEAN;
+ 2410                                               fname: SymTab.Name;
+ 2411                                               astWrap, astSel: AST.Node; .)
+ 2412      = "[" Expr<it, iq>
+ 2413                                          (. IF AST.Kind(node) # AST.NkDesignator THEN
+ 2414                                               astWrap := AST.MakeNode(
+ 2415                                                 AST.NkDesignator);
+ 2416                                               AST.SetChild(astWrap, 0, node);
+ 2417                                               node := astWrap
+ 2418                                             END;
+ 2419                                             AST.SetChild(node, AST.NChild(node),
+ 2420                                               AST.MakeUn(AST.NkSelector,
+ 2421                                                 AST.SelIndex, astCur)); IF t = SymTab.InvalidType THEN
+ 2422                                             ELSIF SymTab.ClassOf(t) #
+ 2423                                                   SymTab.ClArray THEN
+ 2424                                               SemError(217);
+ 2425                                               t := SymTab.InvalidType
+ 2426                                             ELSIF NOT SymTab.IsIntFamily(it)
+ 2427    AND (SymTab.ClassOf(it) # SymTab.ClChar)
+ 2428    AND (SymTab.ClassOf(it) # SymTab.ClEnum) THEN
+ 2429                                               SemError(218);
+ 2430                                               t := SymTab.InvalidType
+ 2431                                             ELSE
+ 2432                                               QbeGen.WidenIndex(iq, ql);
+ 2433                                               isOpen :=
+ 2434                                                 SymTab.IsOpenArray(t);
+ 2435                                               IF isOpen THEN
+ 2436                                                 QbeGen.CopyOp("0", qlo);
+ 2437                                                 IF SymTab.IsCharArray(t)
+ 2438    OR SymTab.IsUCharArray(t) THEN
+ 2439                                                   QbeGen.OpenHiChar(q, qhi)
+ 2440                                                 ELSE QbeGen.OpenHi(q, qhi)
+ 2441                                                 END
+ 2442                                               ELSE
+ 2443                                                 lo := SymTab.ArrayLo(t);
+ 2444                                                 hi := SymTab.ArrayHi(t);
+ 2445                                                 IF SymTab.IsCharArray(t)
+ 2446    OR SymTab.IsUCharArray(t) THEN
+ 2447                                                   hi := hi + 1
+ 2448                                                 END;
+ 2449                                                 QbeGen.IntStr(lo, qlo);
+ 2450                                                 QbeGen.IntStr(hi, qhi)
+ 2451                                               END;
+ 2452                                               QbeGen.CheckRange(ql, qlo,
+ 2453                                                 qhi);
+ 2454                                               eT := SymTab.ArrayElem(t);
+ 2455                                               QbeGen.ElemAddr(q, ql, qlo,
+ 2456                                                 t, qe);
+ 2457                                               IF SymTab.ClassOf(eT) =
+ 2458                                                  SymTab.ClArray THEN
+ 2459                                                 QbeGen.ElemLoad(qe, eT, q)
+ 2460                                               ELSE QbeGen.CopyOp(qe, q)
+ 2461                                               END;
+ 2462                                               t := eT; sfx := TRUE
+ 2463                                             END; .)
+ 2464        "]"
+ 2465      | "." GetIdent<fname>
+ 2466                                          (. IF AST.Kind(node) # AST.NkDesignator THEN
+ 2467                                               astWrap := AST.MakeNode(
+ 2468                                                 AST.NkDesignator);
+ 2469                                               AST.SetChild(astWrap, 0, node);
+ 2470                                               node := astWrap
+ 2471                                             END;
+ 2472                                             AST.SetChild(node, AST.NChild(node),
+ 2473                                               AST.MakeUn(AST.NkSelector,
+ 2474                                                 AST.SelField,
+ 2475                                                 AST.MakeLeaf(AST.NkIdent,
+ 2476                                                   fname))); IF t = SymTab.InvalidType THEN
+ 2477                                             ELSIF (SymTab.ClassOf(t) #
+ 2478                                                    SymTab.ClRecord)
+ 2479    AND (SymTab.ClassOf(t) # SymTab.ClClass) THEN
+ 2480                                               SemError(215);
+ 2481                                               t := SymTab.InvalidType
+ 2482                                             ELSIF NOT SymTab.FieldExists(t,
+ 2483                                                      fname) THEN
+ 2484                                               SemError(216);
+ 2485                                               t := SymTab.InvalidType
+ 2486                                             ELSE
+ 2487                                               fo := SymTab.FieldOffset(t,
+ 2488                                                 fname);
+ 2489                                               t := SymTab.FieldType(t, fname);
+ 2490                                               QbeGen.FieldAddr(q, fo, qe);
+ 2491                                               QbeGen.CopyOp(qe, q);
+ 2492                                               sfx := TRUE
+ 2493                                             END; .)
+ 2494      | "^"                               (. IF AST.Kind(node) # AST.NkDesignator THEN
+ 2495                                               astWrap := AST.MakeNode(
+ 2496                                                 AST.NkDesignator);
+ 2497                                               AST.SetChild(astWrap, 0, node);
+ 2498                                               node := astWrap
+ 2499                                             END;
+ 2500                                             astSel := AST.MakeNode(AST.NkSelector);
+ 2501                                             AST.SetOp(astSel, AST.SelDeref);
+ 2502                                             AST.SetChild(node,
+ 2503                                               AST.NChild(node), astSel); IF t = SymTab.InvalidType THEN
+ 2504                                             ELSIF SymTab.ClassOf(t) #
+ 2505                                                   SymTab.ClPtr THEN
+ 2506                                               SemError(219);
+ 2507                                               t := SymTab.InvalidType
+ 2508                                             ELSE
+ 2509                                               bt := SymTab.PtrBase(t);
+ 2510                                               IF bt # SymTab.InvalidType THEN
+ 2511                                                 IF sfx THEN
+ 2512                                                   QbeGen.ElemLoad(q, t, qb);
+ 2513                                                   QbeGen.CopyOp(qb, q)
+ 2514                                                 END;
+ 2515                                                 t := bt; sfx := TRUE
+ 2516                                               END
+ 2517                                             END; .) .
+ 2518    Expr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2519                                          (. VAR t2: SymTab.TypeIndex;
+ 2520                                               op: INTEGER;
+ 2521                                               q2, qt, wl: QbeGen.QVal;
+ 2522                                                astA, astB: AST.Node;
+ 2523                                                astOp: INTEGER;
+ 2524                                                astMade: BOOLEAN;
+ 2525                                               isR: BOOLEAN; .)
+ 2526      = SimExpr<t, q>                     (. astA := astCur; astMade := FALSE; .)
+ 2527        [ Rel<op> SimExpr<t2, q2>
+ 2528          (. astB := astCur; astMade := TRUE;
+ 2529              astOp := AST.OpEq;
+ 2530              IF op = SymTab.OpNeq1 THEN astOp := AST.OpNe
+ 2531              ELSIF op = SymTab.OpNeq2 THEN astOp := AST.OpNe
+ 2532              ELSIF op = SymTab.OpLt THEN astOp := AST.OpLt
+ 2533              ELSIF op = SymTab.OpLe THEN astOp := AST.OpLe
+ 2534              ELSIF op = SymTab.OpGt THEN astOp := AST.OpGt
+ 2535              ELSIF op = SymTab.OpGe THEN astOp := AST.OpGe
+ 2536              ELSIF op = SymTab.OpIn THEN astOp := AST.OpIn
+ 2537              END;
+ 2538              IF op = SymTab.OpIn THEN
+ 2539               IF SymTab.InCheck(t, t2) THEN
+ 2540                 IF (t = SymTab.InvalidType)
+ 2541                    OR (t2 = SymTab.InvalidType) THEN
+ 2542                   t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
+ 2543                 ELSE
+ 2544                   QbeGen.InSet(q, q2, SymTab.SetBaseLo(t2),
+ 2545                     SymTab.SetCount(t2), qt);
+ 2546                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2547                 END
+ 2548               ELSE SemError(222); t := SymTab.InvalidType;
+ 2549                 QbeGen.CopyOp("0", q)
+ 2550               END
+ 2551             ELSIF SymTab.RelCheck(t, t2, op) THEN
+ 2552               IF (t = SymTab.InvalidType)
+ 2553                  OR (t2 = SymTab.InvalidType) THEN
+ 2554                 t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
+ 2555               ELSIF (SymTab.ClassOf(t) = SymTab.ClPtr)
+ 2556                  OR (SymTab.ClassOf(t2) = SymTab.ClPtr) THEN
+ 2557                 IF SymTab.IsFwdVar(t) OR SymTab.IsFwdVar(t2) THEN
+ 2558                   QbeGen.Cmp(op, q, q2, qt, FALSE);
+ 2559                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2560                 ELSIF (op # SymTab.OpEq) AND (op # SymTab.OpNeq1)
+ 2561   AND (op # SymTab.OpNeq2) THEN
+ 2562                   SemError(213); t := SymTab.InvalidType;
+ 2563                   QbeGen.CopyOp("0", q)
+ 2564                 ELSE
+ 2565                   QbeGen.CmpL(op, q, q2, qt);
+ 2566                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2567                 END
+ 2568               ELSIF (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2569                  OR (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2570                 QbeGen.CmpSet(op, q, q2,
+ 2571                   SymTab.SetWords(t), SymTab.SetWords(t2), qt);
+ 2572                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2573               ELSIF SymTab.StrCompat(t, t2) THEN
+ 2574                 QbeGen.StrEq(op, q, q2, qt);
+ 2575                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2576               ELSIF SymTab.IsLongFamily(t)
+ 2577                  OR SymTab.IsLongFamily(t2) THEN
+ 2578                 IF SymTab.IsIntFamily(t) THEN
+ 2579                   QbeGen.WidenLong(q, wl); QbeGen.CopyOp(wl, q)
+ 2580                 END;
+ 2581                 IF SymTab.IsIntFamily(t2) THEN
+ 2582                   QbeGen.WidenLong(q2, wl); QbeGen.CopyOp(wl, q2)
+ 2583                 END;
+ 2584                 QbeGen.CmpLong(op, q, q2, qt);
+ 2585                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2586               ELSE
+ 2587                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2588                 t := SymTab.BoolType();
+ 2589                 QbeGen.Cmp(op, q, q2, qt, isR);
+ 2590                 QbeGen.CopyOp(qt, q)
+ 2591               END
+ 2592             ELSE SemError(213); t := SymTab.InvalidType;
+ 2593                QbeGen.CopyOp("0", q)
+ 2594              END;
+ 2595              astCur := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB); .) ]
+ 2596         (. IF NOT astMade THEN astCur := astA END; .) .
+ 2597    Rel<VAR op: INTEGER>
+ 2598      = "="                               (. op := SymTab.OpEq; .)
+ 2599      | "#"                               (. op := SymTab.OpNeq1; .)
+ 2600      | "<"                               (. op := SymTab.OpLt; .)
+ 2601      | "<="                              (. op := SymTab.OpLe; .)
+ 2602      | ">"                               (. op := SymTab.OpGt; .)
+ 2603      | ">="                              (. op := SymTab.OpGe; .)
+ 2604      | "IN"                              (. op := SymTab.OpIn; .) .
+ 2605    SimExpr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2606                                          (. VAR t2, res2, lt, rt:
+ 2607                                                 SymTab.TypeIndex;
+ 2608                                               op: INTEGER;
+ 2609                                               q2, qt, wq, qf, q2a, q2b:
+ 2610                                                 QbeGen.QVal;
+ 2611                                               neg, isR, isL, folded:
+ 2612                                                 BOOLEAN;
+ 2613                                               fok: BOOLEAN;
+ 2614                                               lw, rw, mw: CARDINAL;
+ 2615                                               lTrue, lNext, lDone, qr, qs: QbeGen.QVal;
+ 2616                                                astA, astB: AST.Node;
+ 2617                                                astSign, astOp: INTEGER; .)
+ 2618      =                                   (. neg := FALSE; astSign := 0; .)
+ 2619        [ "+"                         (. neg := TRUE; astSign := 1; .)
+ 2620        | "-"                         (. neg := TRUE; astSign := -1; .) ]
+ 2621        Term<t, q> (. astA := astCur; IF neg THEN
+ 2622                                             IF QbeGen.IsImm(q) THEN
+ 2623                                               QbeGen.NegFold(q, q)
+ 2624                                             ELSE QbeGen.NewTemp(qt);
+ 2625                                               QbeGen.NegQ(q, qt,
+ 2626                                                 SymTab.ClassOf(t)
+ 2627                                                 = SymTab.ClReal);
+ 2628                                               QbeGen.CopyOp(qt, q)
+ 2629                                             END
+ 2630                                           END;
+ 2631                                           IF astSign < 0 THEN
+ 2632                                             astCur := AST.MakeUn(
+ 2633                                               AST.NkUnary, AST.OpSub, astA);
+ 2634                                             astA := astCur
+ 2635                                           END; .)
+ 2636        { AddOp<op>                       (. IF op = SymTab.OpOr THEN
+ 2637                                               QbeGen.DelayBegin END; .)
+ 2638          Term<t2, q2> (. astB := astCur; IF op = SymTab.OpOr THEN
+ 2639                                               QbeGen.DelayEnd END; .)
+ 2640          (. astOp := AST.OpAdd;
+ 2641             IF op = SymTab.OpSub THEN astOp := AST.OpSub
+ 2642             ELSIF op = SymTab.OpOr THEN astOp := AST.OpOr END;
+ 2643             astA := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB);
+ 2644             astCur := astA;
+ 2645             IF op = SymTab.OpOr THEN
+ 2646               (* short-circuit: if q is true the RHS is skipped *)
+ 2647               IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
+ 2648                 t := SymTab.BoolType()
+ 2649               ELSE SemError(212); t := SymTab.InvalidType END;
+ 2650               IF t # SymTab.InvalidType THEN
+ 2651                 QbeGen.Slot4(qs);
+ 2652                 QbeGen.NewLabel(lTrue);
+ 2653                 QbeGen.NewLabel(lNext);
+ 2654                 QbeGen.NewLabel(lDone);
+ 2655                 QbeGen.Jnz(q, lTrue, lNext);
+ 2656                 QbeGen.EmitLabel(lTrue);
+ 2657                 QbeGen.StoreW(qs, "1");
+ 2658                 QbeGen.Jmp(lDone);
+ 2659                 QbeGen.EmitLabel(lNext);
+ 2660                 QbeGen.DelayFlush;
+ 2661                 QbeGen.StoreW(qs, q2);
+ 2662                 QbeGen.Jmp(lDone);
+ 2663                 QbeGen.EmitLabel(lDone);
+ 2664                 QbeGen.LoadW(qs, qr);
+ 2665                 QbeGen.CopyOp(qr, q)
+ 2666               ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
+ 2667               END
+ 2668             ELSIF (op = SymTab.OpAdd)
+ 2669               AND (SymTab.UStrCompat(t, t2)
+ 2670                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
+ 2671                   AND (SymTab.ClassOf(t2) = SymTab.ClUStr))
+ 2672                 OR ((SymTab.ClassOf(t) = SymTab.ClUStr)
+ 2673                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))
+ 2674                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
+ 2675                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))) THEN
+ 2676               (* UString concatenation: a UCHAR operand becomes a
+ 2677                  1-codepoint UString; the result is a descriptor in the
+ 2678                  shim's concat buffer.  Work on copies so neither
+ 2679                  operand is clobbered. *)
+ 2680               IF SymTab.ClassOf(t) = SymTab.ClUStr THEN
+ 2681                 QbeGen.CopyOp(q, q2a)
  2682               ELSE
- 2683                 QbeGen.SetBinOp(2, q, q2, lw, rw, qt)
+ 2683                 QbeGen.UStrFrom(q, q2a)
  2684               END;
- 2685               t := SymTab.NewSet(
- 2686                      SymTab.NewSubR(0,
- 2687                        VAL(INTEGER, mw) * 32 - 1));
- 2688               QbeGen.CopyOp(qt, q)
- 2689             ELSE
- 2690               IF SymTab.ArithCheck(t, t2, FALSE, res2) THEN
- 2691                 lt := t; rt := t2; t := res2
- 2692               ELSE SemError(211); t := SymTab.InvalidType END;
- 2693               IF t # SymTab.InvalidType THEN
- 2694                 isL := SymTab.IsLongFamily(t);
- 2695                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2696                 folded := FALSE;
- 2697                 IF (NOT isL) AND (NOT isR)
- 2698    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
- 2699                   IF op = SymTab.OpAdd THEN
- 2700                     folded := QbeGen.Fold2(0, q, q2, qf)
- 2701                   ELSE
- 2702                     folded := QbeGen.Fold2(1, q, q2, qf)
- 2703                   END
- 2704                 END;
- 2705                 IF folded THEN QbeGen.CopyOp(qf, q)
- 2706                 ELSE
- 2707                 IF isL THEN
- 2708                   IF SymTab.IsIntFamily(lt) THEN
- 2709                     QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
- 2710                   END;
- 2711                   IF SymTab.IsIntFamily(rt) THEN
- 2712                     QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
- 2713                   END;
- 2714                   QbeGen.NewTemp(qt);
- 2715                   IF op = SymTab.OpAdd THEN
- 2716                     QbeGen.Op3L("add", qt, q, q2)
- 2717                   ELSE
- 2718                     QbeGen.Op3L("sub", qt, q, q2)
- 2719                   END
- 2720                 ELSE
- 2721                   QbeGen.NewTemp(qt);
- 2722                   IF op = SymTab.OpAdd THEN
- 2723                     QbeGen.Op3("add", qt, q, q2, isR)
- 2724                   ELSE
- 2725                     QbeGen.Op3("sub", qt, q, q2, isR)
- 2726                   END
- 2727                 END;
- 2728                 QbeGen.CopyOp(qt, q)
- 2729                 END
- 2730               ELSE QbeGen.CopyOp("0", q)
- 2731               END
- 2732             END; .) } .
- 2733    AddOp<VAR op: INTEGER>
- 2734      = "+"                               (. op := SymTab.OpAdd; .)
- 2735      | "-"                               (. op := SymTab.OpSub; .)
- 2736      | "OR"                              (. op := SymTab.OpOr; .) .
- 2737    Term<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2738                                          (. VAR t2, res2, lt, rt:
- 2739                                                 SymTab.TypeIndex;
- 2740                                               op: INTEGER;
- 2741                                               q2, qt, wq, qf:
- 2742                                                 QbeGen.QVal;
- 2743                                               isR, isL, folded: BOOLEAN;
- 2744                                               lw, rw, mw: CARDINAL;
- 2745                                               lNext, lFalse, lDone, qr, qs: QbeGen.QVal;
- 2746                                                astA, astB: AST.Node;
- 2747                                                astOp: INTEGER; .)
- 2748      = Fact<t, q> (. astA := astCur; .) { MulOp<op>            (. IF op = SymTab.OpAnd THEN
- 2749                                               QbeGen.DelayBegin END; .)
- 2750          Fact<t2, q2> (. astB := astCur; IF op = SymTab.OpAnd THEN
- 2751                                                QbeGen.DelayEnd END; .)
- 2752        (. astOp := AST.OpMul;
- 2753           IF op = SymTab.OpSlash THEN astOp := AST.OpDiv
- 2754           ELSIF op = SymTab.OpDiv THEN astOp := AST.OpDiv
- 2755           ELSIF op = SymTab.OpMod THEN astOp := AST.OpMod
- 2756           ELSIF op = SymTab.OpAnd THEN astOp := AST.OpAnd END;
- 2757           astA := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB);
- 2758           astCur := astA;
- 2759           IF op = SymTab.OpAnd THEN
- 2760             (* short-circuit: if q is false the RHS is skipped *)
- 2761             IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
- 2762               t := SymTab.BoolType()
- 2763             ELSE SemError(212); t := SymTab.InvalidType END;
- 2764             IF t # SymTab.InvalidType THEN
- 2765               QbeGen.Slot4(qs);
- 2766               QbeGen.NewLabel(lNext);
- 2767               QbeGen.NewLabel(lFalse);
- 2768               QbeGen.NewLabel(lDone);
- 2769               QbeGen.Jnz(q, lNext, lFalse);
- 2770               QbeGen.EmitLabel(lNext);
- 2771               QbeGen.DelayFlush;
- 2772               QbeGen.StoreW(qs, q2);
- 2773               QbeGen.Jmp(lDone);
- 2774               QbeGen.EmitLabel(lFalse);
- 2775               QbeGen.StoreW(qs, "0");
- 2776               QbeGen.Jmp(lDone);
- 2777               QbeGen.EmitLabel(lDone);
- 2778               QbeGen.LoadW(qs, qr);
- 2779               QbeGen.CopyOp(qr, q)
- 2780             ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
- 2781             END
- 2782           ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
- 2783   AND (SymTab.ClassOf(t) = SymTab.ClSet)
- 2784   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2785             lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
- 2786             mw := lw;
- 2787             IF rw > mw THEN mw := rw END;
- 2788             IF op = SymTab.OpTimes THEN
- 2789               QbeGen.SetBinOp(1, q, q2, lw, rw, qt)
- 2790             ELSE
- 2791               QbeGen.SetBinOp(3, q, q2, lw, rw, qt)
- 2792             END;
- 2793             t := SymTab.NewSet(
- 2794                    SymTab.NewSubR(0,
- 2795                      VAL(INTEGER, mw) * 32 - 1));
- 2796             QbeGen.CopyOp(qt, q)
- 2797           ELSE
- 2798             IF SymTab.ArithCheck(t, t2,
- 2799                  (op = SymTab.OpDiv) OR (op = SymTab.OpMod),
- 2800                  res2) THEN
- 2801               lt := t; rt := t2; t := res2
- 2802             ELSE SemError(211); t := SymTab.InvalidType END;
- 2803             IF t # SymTab.InvalidType THEN
- 2804               isL := SymTab.IsLongFamily(t);
- 2805               isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2806               folded := FALSE;
- 2807               IF (NOT isL) AND (NOT isR)
- 2808    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
- 2809                 IF op = SymTab.OpTimes THEN
- 2810                   folded := QbeGen.Fold2(2, q, q2, qf)
- 2811                 ELSIF op = SymTab.OpDiv THEN
- 2812                   folded := QbeGen.Fold2(3, q, q2, qf)
- 2813                 ELSIF op = SymTab.OpMod THEN
- 2814                   folded := QbeGen.Fold2(4, q, q2, qf)
- 2815                 END
- 2816               END;
- 2817               IF folded THEN QbeGen.CopyOp(qf, q)
- 2818               ELSE
- 2819               IF isL THEN
- 2820                 IF SymTab.IsIntFamily(lt) THEN
- 2821                   QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
- 2822                 END;
- 2823                 IF SymTab.IsIntFamily(rt) THEN
- 2824                   QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
- 2825                 END;
- 2826                 QbeGen.NewTemp(qt);
- 2827                 IF op = SymTab.OpTimes THEN
- 2828                   QbeGen.Op3L("mul", qt, q, q2)
- 2829                 ELSIF (op = SymTab.OpDiv)
- 2830                    OR (op = SymTab.OpSlash) THEN
- 2831                   QbeGen.Op3L("div", qt, q, q2)
- 2832                 ELSE
- 2833                   QbeGen.Op3L("rem", qt, q, q2)
- 2834                 END
- 2835               ELSE
- 2836                 QbeGen.NewTemp(qt);
- 2837                 IF op = SymTab.OpTimes THEN
- 2838                   QbeGen.Op3("mul", qt, q, q2, isR)
- 2839                 ELSIF (op = SymTab.OpDiv)
- 2840                    OR (op = SymTab.OpSlash) THEN
- 2841                   QbeGen.Op3("div", qt, q, q2, isR)
- 2842                 ELSE
- 2843                   QbeGen.Op3("rem", qt, q, q2, isR)
- 2844                 END
- 2845               END;
- 2846               QbeGen.CopyOp(qt, q)
- 2847               END
- 2848             ELSE QbeGen.CopyOp("0", q)
- 2849             END
- 2850           END; .) } .
- 2851    MulOp<VAR op: INTEGER>
- 2852      = "*"                               (. op := SymTab.OpTimes; .)
- 2853      | "/"                               (. op := SymTab.OpSlash; .)
- 2854      | "DIV"                             (. op := SymTab.OpDiv; .)
- 2855      | "MOD"                             (. op := SymTab.OpMod; .)
- 2856      | ( "AND" | "&" )                   (. op := SymTab.OpAnd; .) .
- 2857    Fact<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2858                                          (. VAR s: ARRAY [0 .. 255] OF CHAR;
- 2859                                               et, dt, t2, st, ct2, et2:
- 2860                                                 SymTab.TypeIndex;
- 2861                                               dk: INTEGER;
- 2862                                               qd, q2, sq, qa, qm0, qr, qt:
- 2863                                                 QbeGen.QVal;
- 2864                                               qn, vn: SymTab.Name;
- 2865                                               vt: SymTab.TypeIndex;
- 2866                                               c1, c2: INTEGER;
- 2867                                               lo, hi: INTEGER;
- 2868                                               isMax: BOOLEAN;
- 2869                                               called, isHigh, sfx, isCh,
- 2870                                               isU, uok, isStr: BOOLEAN;
- 2871                                               ucp: INTEGER; astIsLit: BOOLEAN;
- 2872                                                astD: AST.Node;
- 2873                                                astCall: BOOLEAN;
- 2874                                                astNode, astNot: AST.Node;
- 2875                                                j: CARDINAL;
- 2876                                                astArg2: AST.Node;
- 2877                                                astBrace: AST.Node; .)
- 2878      = (. astIsLit := FALSE; .)
- 2879      ( integer                           (. LexString(s);
- 2880                                             QbeGen.NormInt(s, q); IF twoPhase THEN astIsLit := TRUE; astCur := AST.MakeLeaf(AST.NkIntLit, s) END;
- 2881                                             t := SymTab.IntType(); .)
- 2882      | charConst                         (. LexString(s);
- 2883                                             QbeGen.NormLit(s, q, isCh);
- 2884                                             IF twoPhase THEN
- 2885                                               astIsLit := TRUE;
- 2886                                               astCur := AST.MakeLeaf(
- 2887                                                 AST.NkCharLit, s)
- 2888                                             END;
- 2889                                             t := SymTab.CharType(); .)
- 2890      | real                              (. LexString(s);
- 2891                                             QbeGen.NormReal(s, q);
- 2892                                             IF twoPhase THEN
- 2893                                               astIsLit := TRUE;
- 2894                                               astCur := AST.MakeLeaf(
- 2895                                                 AST.NkRealLit, s)
- 2896                                             END;
- 2897                                             t := SymTab.RealType(); .)
- 2898      | string                            (. LexString(s);
- 2899                                             IF twoPhase THEN
- 2900                                               astIsLit := TRUE;
- 2901                                               astCur := AST.MakeLeaf(
- 2902                                                 AST.NkStrLit, s)
- 2903                                             END;
- 2904                                             IF SymTab.StrLen(s) = 3 THEN
- 2905                                               t := SymTab.CharType();
- 2906                                               QbeGen.IntStr(
- 2907                                                 QbeGen.CharVal(s), q)
- 2908                                             ELSE t := SymTab.NewStr();
- 2909                                               QbeGen.DeclStr(s, q);
- 2910                                               (* a literal's value IS its
- 2911                                                  static descriptor address *)
- 2912                                               QbeGen.NoteAddr(q, q)
- 2913                                             END; .)
- 2914      | ustring                           (. LexString(s);
- 2915                                             IF twoPhase THEN
- 2916                                               astIsLit := TRUE;
- 2917                                               astCur := AST.MakeLeaf(
- 2918                                                 AST.NkStrLit, s)
- 2919                                             END;
- 2920                                             QbeGen.DeclUStr(s, q, isU, ucp,
- 2921                                               uok);
- 2922                                             IF NOT uok THEN
- 2923                                               SemError(234);
- 2924                                               t := SymTab.InvalidType
- 2925                                             ELSIF isU THEN
- 2926                                               t := SymTab.UCharType();
- 2927                                               QbeGen.IntStr(ucp, q)
- 2928                                             ELSE
- 2929                                               t := SymTab.NewUStr();
- 2930                                               QbeGen.NoteAddr(q, q)
- 2931                                             END; .)
- 2932      | Design<dt, dk, qd, qn, sfx>       (. astD := astCur; astCall := FALSE; astBrace := AST.NoNode;
- 2933                                             astNArgs := 0; called := FALSE;
- 2934                                             t := dt;
- 2935                                             IF sfx THEN
- 2936                                               IF dt =
- 2937                                                  SymTab.InvalidType THEN
- 2938                                                 QbeGen.CopyOp("0", q)
- 2939                                               ELSIF (SymTab.ClassOf(dt) =
- 2940                                                      SymTab.ClRecord)
- 2941                                                  OR (SymTab.ClassOf(dt) =
- 2942                                                      SymTab.ClSet)
- 2943                                                  OR (SymTab.ClassOf(dt) =
- 2944                                                      SymTab.ClArray)
- 2945                                                  OR (SymTab.ClassOf(dt) =
- 2946                                                      SymTab.ClClass) THEN
- 2947                                                 QbeGen.CopyOp(qd, q)
- 2948                                               ELSE QbeGen.ElemLoad(qd, dt,
- 2949                                                 q)
- 2950                                               END
- 2951                                             ELSE QbeGen.CopyOp(qd, q)
- 2952                                             END;
- 2953                                             IF (dk = SymTab.KindVar)
- 2954                                                OR (dk = SymTab.KindParam)
- 2955                                                OR (dk =
- 2956                                                   SymTab.KindField) THEN
- 2957                                               IF sfx THEN
- 2958                                                 QbeGen.NoteAddr(q, qd)
- 2959                                               ELSE
- 2960                                                 QbeGen.AddrOf(qn, qa);
- 2961                                                 QbeGen.NoteAddr(q, qa)
- 2962                                               END
- 2963                                             ELSIF sfx
- 2964   AND (dt #
- 2965                                                   SymTab.InvalidType)
- 2966   AND ((SymTab.ClassOf(dt) =
- 2967                                                    SymTab.ClArray)
- 2968                                                   OR (SymTab.ClassOf(dt) =
- 2969                                                       SymTab.ClSet)
- 2970                                                   OR (SymTab.ClassOf(dt) =
- 2971                                                       SymTab.ClRecord)) THEN
- 2972                                               QbeGen.NoteAddr(qd, qd)
- 2973                                             END; .)
- 2974        [ TypedBraceLit<dt, q>            (. t := dt; astCall := TRUE;
- 2975                                               astBrace := astCur; .) ]
- 2976        [ ArgList<qn, dt, qd, TRUE, FALSE, methCls, ct2, q2, called>
- 2977                                          (. astCall := TRUE; t := ct2;
- 2978                                             QbeGen.CopyOp(q2, q);
- 2979                                             sfx := FALSE; .)
- 2980          { ResultComp<t, q, sfx> }
- 2981                                          (. IF sfx THEN
- 2982                                               IF t = SymTab.InvalidType THEN
+ 2685               IF SymTab.ClassOf(t2) = SymTab.ClUStr THEN
+ 2686                 QbeGen.UStrCat(q2a, q2, qt)
+ 2687               ELSE
+ 2688                 QbeGen.UStrFrom(q2, q2b);
+ 2689                 QbeGen.UStrCat(q2a, q2b, qt)
+ 2690               END;
+ 2691               t := SymTab.NewUStr();
+ 2692               QbeGen.CopyOp(qt, q)
+ 2693             ELSIF (op = SymTab.OpAdd)
+ 2694               AND (SymTab.StrCompat(t, t2)
+ 2695                 OR (SymTab.IsStrType(t)
+ 2696                   AND (SymTab.ClassOf(t2) = SymTab.ClChar))
+ 2697                 OR ((SymTab.ClassOf(t) = SymTab.ClChar)
+ 2698                   AND SymTab.IsStrType(t2))) THEN
+ 2699               (* string concatenation; a CHAR operand becomes a
+ 2700                  1-character string literal.  When both operands are
+ 2701                  constants, fold to a single string literal so a
+ 2702                  constructor element stays compile-time. *)
+ 2703               QbeGen.StrFold(q, q2, SymTab.ClassOf(t), SymTab.ClassOf(t2),
+ 2704                 qt, fok);
+ 2705               IF NOT fok THEN
+ 2706                 IF SymTab.StrCompat(t, t2) THEN
+ 2707                   QbeGen.StrCat(q, q2, qt)
+ 2708                 ELSIF SymTab.IsStrType(t) THEN
+ 2709                   QbeGen.DeclCharStr(q2, qs);
+ 2710                   QbeGen.StrCat(q, qs, qt)
+ 2711                 ELSE
+ 2712                   QbeGen.DeclCharStr(q, qs);
+ 2713                   QbeGen.StrCat(qs, q2, qt)
+ 2714                 END
+ 2715               END;
+ 2716               t := SymTab.NewStr();
+ 2717               QbeGen.CopyOp(qt, q)
+ 2718             ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
+ 2719   AND (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2720   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2721               lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
+ 2722               mw := lw;
+ 2723               IF rw > mw THEN mw := rw END;
+ 2724               IF op = SymTab.OpAdd THEN
+ 2725                 QbeGen.SetBinOp(0, q, q2, lw, rw, qt)
+ 2726               ELSE
+ 2727                 QbeGen.SetBinOp(2, q, q2, lw, rw, qt)
+ 2728               END;
+ 2729               t := SymTab.NewSet(
+ 2730                      SymTab.NewSubR(0,
+ 2731                        VAL(INTEGER, mw) * 32 - 1));
+ 2732               QbeGen.CopyOp(qt, q)
+ 2733             ELSE
+ 2734               IF SymTab.ArithCheck(t, t2, FALSE, res2) THEN
+ 2735                 lt := t; rt := t2; t := res2
+ 2736               ELSE SemError(211); t := SymTab.InvalidType END;
+ 2737               IF t # SymTab.InvalidType THEN
+ 2738                 isL := SymTab.IsLongFamily(t);
+ 2739                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2740                 folded := FALSE;
+ 2741                 IF (NOT isL) AND (NOT isR)
+ 2742    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
+ 2743                   IF op = SymTab.OpAdd THEN
+ 2744                     folded := QbeGen.Fold2(0, q, q2, qf)
+ 2745                   ELSE
+ 2746                     folded := QbeGen.Fold2(1, q, q2, qf)
+ 2747                   END
+ 2748                 END;
+ 2749                 IF folded THEN QbeGen.CopyOp(qf, q)
+ 2750                 ELSE
+ 2751                 IF isL THEN
+ 2752                   IF SymTab.IsIntFamily(lt) THEN
+ 2753                     QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
+ 2754                   END;
+ 2755                   IF SymTab.IsIntFamily(rt) THEN
+ 2756                     QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
+ 2757                   END;
+ 2758                   QbeGen.NewTemp(qt);
+ 2759                   IF op = SymTab.OpAdd THEN
+ 2760                     QbeGen.Op3L("add", qt, q, q2)
+ 2761                   ELSE
+ 2762                     QbeGen.Op3L("sub", qt, q, q2)
+ 2763                   END
+ 2764                 ELSE
+ 2765                   QbeGen.NewTemp(qt);
+ 2766                   IF op = SymTab.OpAdd THEN
+ 2767                     QbeGen.Op3("add", qt, q, q2, isR)
+ 2768                   ELSE
+ 2769                     QbeGen.Op3("sub", qt, q, q2, isR)
+ 2770                   END
+ 2771                 END;
+ 2772                 QbeGen.CopyOp(qt, q)
+ 2773                 END
+ 2774               ELSE QbeGen.CopyOp("0", q)
+ 2775               END
+ 2776             END; .) } .
+ 2777    AddOp<VAR op: INTEGER>
+ 2778      = "+"                               (. op := SymTab.OpAdd; .)
+ 2779      | "-"                               (. op := SymTab.OpSub; .)
+ 2780      | "OR"                              (. op := SymTab.OpOr; .) .
+ 2781    Term<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2782                                          (. VAR t2, res2, lt, rt:
+ 2783                                                 SymTab.TypeIndex;
+ 2784                                               op: INTEGER;
+ 2785                                               q2, qt, wq, qf:
+ 2786                                                 QbeGen.QVal;
+ 2787                                               isR, isL, folded: BOOLEAN;
+ 2788                                               lw, rw, mw: CARDINAL;
+ 2789                                               lNext, lFalse, lDone, qr, qs: QbeGen.QVal;
+ 2790                                                astA, astB: AST.Node;
+ 2791                                                astOp: INTEGER; .)
+ 2792      = Fact<t, q> (. astA := astCur; .) { MulOp<op>            (. IF op = SymTab.OpAnd THEN
+ 2793                                               QbeGen.DelayBegin END; .)
+ 2794          Fact<t2, q2> (. astB := astCur; IF op = SymTab.OpAnd THEN
+ 2795                                                QbeGen.DelayEnd END; .)
+ 2796        (. astOp := AST.OpMul;
+ 2797           IF op = SymTab.OpSlash THEN astOp := AST.OpDiv
+ 2798           ELSIF op = SymTab.OpDiv THEN astOp := AST.OpDiv
+ 2799           ELSIF op = SymTab.OpMod THEN astOp := AST.OpMod
+ 2800           ELSIF op = SymTab.OpAnd THEN astOp := AST.OpAnd END;
+ 2801           astA := AST.MakeBin(AST.NkBinExpr, astOp, astA, astB);
+ 2802           astCur := astA;
+ 2803           IF op = SymTab.OpAnd THEN
+ 2804             (* short-circuit: if q is false the RHS is skipped *)
+ 2805             IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
+ 2806               t := SymTab.BoolType()
+ 2807             ELSE SemError(212); t := SymTab.InvalidType END;
+ 2808             IF t # SymTab.InvalidType THEN
+ 2809               QbeGen.Slot4(qs);
+ 2810               QbeGen.NewLabel(lNext);
+ 2811               QbeGen.NewLabel(lFalse);
+ 2812               QbeGen.NewLabel(lDone);
+ 2813               QbeGen.Jnz(q, lNext, lFalse);
+ 2814               QbeGen.EmitLabel(lNext);
+ 2815               QbeGen.DelayFlush;
+ 2816               QbeGen.StoreW(qs, q2);
+ 2817               QbeGen.Jmp(lDone);
+ 2818               QbeGen.EmitLabel(lFalse);
+ 2819               QbeGen.StoreW(qs, "0");
+ 2820               QbeGen.Jmp(lDone);
+ 2821               QbeGen.EmitLabel(lDone);
+ 2822               QbeGen.LoadW(qs, qr);
+ 2823               QbeGen.CopyOp(qr, q)
+ 2824             ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
+ 2825             END
+ 2826           ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
+ 2827   AND (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2828   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2829             lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
+ 2830             mw := lw;
+ 2831             IF rw > mw THEN mw := rw END;
+ 2832             IF op = SymTab.OpTimes THEN
+ 2833               QbeGen.SetBinOp(1, q, q2, lw, rw, qt)
+ 2834             ELSE
+ 2835               QbeGen.SetBinOp(3, q, q2, lw, rw, qt)
+ 2836             END;
+ 2837             t := SymTab.NewSet(
+ 2838                    SymTab.NewSubR(0,
+ 2839                      VAL(INTEGER, mw) * 32 - 1));
+ 2840             QbeGen.CopyOp(qt, q)
+ 2841           ELSE
+ 2842             IF SymTab.ArithCheck(t, t2,
+ 2843                  (op = SymTab.OpDiv) OR (op = SymTab.OpMod),
+ 2844                  res2) THEN
+ 2845               lt := t; rt := t2; t := res2
+ 2846             ELSE SemError(211); t := SymTab.InvalidType END;
+ 2847             IF t # SymTab.InvalidType THEN
+ 2848               isL := SymTab.IsLongFamily(t);
+ 2849               isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2850               folded := FALSE;
+ 2851               IF (NOT isL) AND (NOT isR)
+ 2852    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
+ 2853                 IF op = SymTab.OpTimes THEN
+ 2854                   folded := QbeGen.Fold2(2, q, q2, qf)
+ 2855                 ELSIF op = SymTab.OpDiv THEN
+ 2856                   folded := QbeGen.Fold2(3, q, q2, qf)
+ 2857                 ELSIF op = SymTab.OpMod THEN
+ 2858                   folded := QbeGen.Fold2(4, q, q2, qf)
+ 2859                 END
+ 2860               END;
+ 2861               IF folded THEN QbeGen.CopyOp(qf, q)
+ 2862               ELSE
+ 2863               IF isL THEN
+ 2864                 IF SymTab.IsIntFamily(lt) THEN
+ 2865                   QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
+ 2866                 END;
+ 2867                 IF SymTab.IsIntFamily(rt) THEN
+ 2868                   QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
+ 2869                 END;
+ 2870                 QbeGen.NewTemp(qt);
+ 2871                 IF op = SymTab.OpTimes THEN
+ 2872                   QbeGen.Op3L("mul", qt, q, q2)
+ 2873                 ELSIF (op = SymTab.OpDiv)
+ 2874                    OR (op = SymTab.OpSlash) THEN
+ 2875                   QbeGen.Op3L("div", qt, q, q2)
+ 2876                 ELSE
+ 2877                   QbeGen.Op3L("rem", qt, q, q2)
+ 2878                 END
+ 2879               ELSE
+ 2880                 QbeGen.NewTemp(qt);
+ 2881                 IF op = SymTab.OpTimes THEN
+ 2882                   QbeGen.Op3("mul", qt, q, q2, isR)
+ 2883                 ELSIF (op = SymTab.OpDiv)
+ 2884                    OR (op = SymTab.OpSlash) THEN
+ 2885                   QbeGen.Op3("div", qt, q, q2, isR)
+ 2886                 ELSE
+ 2887                   QbeGen.Op3("rem", qt, q, q2, isR)
+ 2888                 END
+ 2889               END;
+ 2890               QbeGen.CopyOp(qt, q)
+ 2891               END
+ 2892             ELSE QbeGen.CopyOp("0", q)
+ 2893             END
+ 2894           END; .) } .
+ 2895    MulOp<VAR op: INTEGER>
+ 2896      = "*"                               (. op := SymTab.OpTimes; .)
+ 2897      | "/"                               (. op := SymTab.OpSlash; .)
+ 2898      | "DIV"                             (. op := SymTab.OpDiv; .)
+ 2899      | "MOD"                             (. op := SymTab.OpMod; .)
+ 2900      | ( "AND" | "&" )                   (. op := SymTab.OpAnd; .) .
+ 2901    Fact<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2902                                          (. VAR s: ARRAY [0 .. 255] OF CHAR;
+ 2903                                               et, dt, t2, st, ct2, et2:
+ 2904                                                 SymTab.TypeIndex;
+ 2905                                               dk: INTEGER;
+ 2906                                               qd, q2, sq, qa, qm0, qr, qt:
+ 2907                                                 QbeGen.QVal;
+ 2908                                               qn, vn: SymTab.Name;
+ 2909                                               vt: SymTab.TypeIndex;
+ 2910                                               c1, c2: INTEGER;
+ 2911                                               lo, hi: INTEGER;
+ 2912                                               isMax: BOOLEAN;
+ 2913                                               called, isHigh, sfx, isCh,
+ 2914                                               isU, uok, isStr: BOOLEAN;
+ 2915                                               ucp: INTEGER; astIsLit: BOOLEAN;
+ 2916                                                astD: AST.Node;
+ 2917                                                astCall: BOOLEAN;
+ 2918                                                astNode, astNot: AST.Node;
+ 2919                                                j: CARDINAL;
+ 2920                                                astArg2: AST.Node;
+ 2921                                                astBrace: AST.Node;
+ 2922                                                astRes: AST.Node; .)
+ 2923      = (. astIsLit := FALSE; .)
+ 2924      ( integer                           (. LexString(s);
+ 2925                                             QbeGen.NormInt(s, q); IF twoPhase THEN astIsLit := TRUE; astCur := AST.MakeLeaf(AST.NkIntLit, s) END;
+ 2926                                             t := SymTab.IntType(); .)
+ 2927      | charConst                         (. LexString(s);
+ 2928                                             QbeGen.NormLit(s, q, isCh);
+ 2929                                             IF twoPhase THEN
+ 2930                                               astIsLit := TRUE;
+ 2931                                               astCur := AST.MakeLeaf(
+ 2932                                                 AST.NkCharLit, s)
+ 2933                                             END;
+ 2934                                             t := SymTab.CharType(); .)
+ 2935      | real                              (. LexString(s);
+ 2936                                             QbeGen.NormReal(s, q);
+ 2937                                             IF twoPhase THEN
+ 2938                                               astIsLit := TRUE;
+ 2939                                               astCur := AST.MakeLeaf(
+ 2940                                                 AST.NkRealLit, s)
+ 2941                                             END;
+ 2942                                             t := SymTab.RealType(); .)
+ 2943      | string                            (. LexString(s);
+ 2944                                             IF twoPhase THEN
+ 2945                                               astIsLit := TRUE;
+ 2946                                               astCur := AST.MakeLeaf(
+ 2947                                                 AST.NkStrLit, s)
+ 2948                                             END;
+ 2949                                             IF SymTab.StrLen(s) = 3 THEN
+ 2950                                               t := SymTab.CharType();
+ 2951                                               QbeGen.IntStr(
+ 2952                                                 QbeGen.CharVal(s), q)
+ 2953                                             ELSE t := SymTab.NewStr();
+ 2954                                               QbeGen.DeclStr(s, q);
+ 2955                                               (* a literal's value IS its
+ 2956                                                  static descriptor address *)
+ 2957                                               QbeGen.NoteAddr(q, q)
+ 2958                                             END; .)
+ 2959      | ustring                           (. LexString(s);
+ 2960                                             IF twoPhase THEN
+ 2961                                               astIsLit := TRUE;
+ 2962                                               astCur := AST.MakeLeaf(
+ 2963                                                 AST.NkStrLit, s)
+ 2964                                             END;
+ 2965                                             QbeGen.DeclUStr(s, q, isU, ucp,
+ 2966                                               uok);
+ 2967                                             IF NOT uok THEN
+ 2968                                               SemError(234);
+ 2969                                               t := SymTab.InvalidType
+ 2970                                             ELSIF isU THEN
+ 2971                                               t := SymTab.UCharType();
+ 2972                                               QbeGen.IntStr(ucp, q)
+ 2973                                             ELSE
+ 2974                                               t := SymTab.NewUStr();
+ 2975                                               QbeGen.NoteAddr(q, q)
+ 2976                                             END; .)
+ 2977      | Design<dt, dk, qd, qn, sfx>       (. astD := astCur; astCall := FALSE; astBrace := AST.NoNode;
+ 2978                                             astNArgs := 0; called := FALSE;
+ 2979                                             t := dt;
+ 2980                                             IF sfx THEN
+ 2981                                               IF dt =
+ 2982                                                  SymTab.InvalidType THEN
  2983                                                 QbeGen.CopyOp("0", q)
- 2984                                               ELSIF (SymTab.ClassOf(t) #
+ 2984                                               ELSIF (SymTab.ClassOf(dt) =
  2985                                                      SymTab.ClRecord)
- 2986    AND (SymTab.ClassOf(t) # SymTab.ClSet)
- 2987    AND (SymTab.ClassOf(t) # SymTab.ClArray)
- 2988    AND (SymTab.ClassOf(t) # SymTab.ClClass) THEN
- 2989                                                 QbeGen.ElemLoad(q, t, q2);
- 2990                                                 QbeGen.CopyOp(q2, q)
- 2991                                               END
- 2992                                             END; .) ]
- 2993                                          (. IF called THEN
- 2994                                               astNode := AST.MakeNode(AST.NkCall);
- 2995                                               AST.SetChild(astNode, 0, astD);
- 2996                                               j := 0;
- 2997                                               WHILE (j < astNArgs)
- 2998                                                 AND (AST.NChild(astNode) <
- 2999                                                      AST.MaxChild) DO
- 3000                                                 AST.SetChild(astNode,
- 3001                                                   AST.NChild(astNode), astArgs[j]);
- 3002                                                 INC(j)
- 3003                                               END;
- 3004                                               astCur := astNode
- 3005                                             ELSIF astCall THEN
- 3006                                               astCur := astBrace
- 3007                                             ELSE astCur := astD
- 3008                                             END;
- 3009                                              astIsLit := TRUE;
- 3010                                              IF NOT called
- 3011   AND (dk = SymTab.KindProc) THEN
- 3012                                               (* bare zero-arg function
- 3013                                                  call (parentheses may be
- 3014                                                  omitted); a proper or
- 3015                                                  parameterised proc here
- 3016                                                  is 230 *)
- 3017                                               IF (SymTab.ProcNPar(qn) = 0)
- 3018   AND (SymTab.ProcRes(qn) #
- 3019                                                     SymTab.InvalidType) THEN
- 3020                                                 QbeGen.Mangled(qn,
- 3021                                                   SymTab.ProcUid(qn), qm0);
- 3022                                                 QbeGen.CallBegin(qm0,
- 3023                                                   SymTab.ProcRes(qn),
- 3024                                                   SymTab.ProcDepthOf(qn),
- 3025                                                   SymTab.IsExternal(qn));
- 3026                                                 QbeGen.CallEnd(TRUE, q);
- 3027                                                 t := SymTab.ProcRes(qn)
- 3028                                               ELSE
- 3029                                                 (* procedure used as a
- 3030                                                    value (assign to a
- 3031                                                    procedure variable):
- 3032                                                    its code address *)
- 3033                                                 t := SymTab.ProcTypeOf(qn);
- 3034                                                 QbeGen.Mangled(qn,
- 3035                                                   SymTab.ProcUid(qn), qm0);
- 3036                                                 QbeGen.ProcAddr(qm0, q)
- 3037                                               END
- 3038                                             END; .)
- 3039      | ( "HIGH"                          (. isHigh := TRUE; .)
- 3040        | ( "LEN" | "LENGTH" )            (. isHigh := FALSE; .) )
- 3041        "(" ( Design<dt, dk, qd, qn, sfx> (. isStr := FALSE;
- 3042                                              isU := FALSE; .)
- 3043            | string                       (. LexString(s); astCur := AST.MakeLeaf(AST.NkStrLit, s);
- 3044                                              isStr := TRUE;
- 3045                                              isU := FALSE;
- 3046                                              IF SymTab.StrLen(s) = 3 THEN
- 3047                                                dt := SymTab.CharType();
- 3048                                                QbeGen.IntStr(QbeGen.CharVal(s),
- 3049                                                  qd)
- 3050                                              ELSE
- 3051                                                dt := SymTab.NewStr();
- 3052                                                QbeGen.DeclStr(s, qd);
- 3053                                                QbeGen.NoteAddr(qd, qd)
- 3054                                              END;
- 3055                                              dk := -1;
- 3056                                              qn[0] := CHR(0); .)
- 3057            | ustring                      (. LexString(s); astCur := AST.MakeLeaf(AST.NkStrLit, s);
- 3058                                              QbeGen.DeclUStr(s, qd, isU, ucp,
- 3059                                                uok);
- 3060                                              isStr := FALSE;
- 3061                                              IF NOT uok THEN
- 3062                                                SemError(234);
- 3063                                                dt := SymTab.InvalidType
- 3064                                              ELSIF isU THEN
- 3065                                                (* one codepoint: a UCHAR;
- 3066                                                   LEN is 1, HIGH is 0 *)
- 3067                                                dt := SymTab.UCharType();
- 3068                                                QbeGen.IntStr(ucp, qd)
- 3069                                              ELSE
- 3070                                                dt := SymTab.NewUStr();
- 3071                                                QbeGen.NoteAddr(qd, qd)
- 3072                                              END;
- 3073                                              dk := -1;
- 3074                                              qn[0] := CHR(0); .) )
- 3075        ")"
- 3076                                          (. astNode := AST.MakeNode(AST.NkCall);
- 3077     IF isHigh THEN AST.SetChild(astNode, 0,
- 3078       AST.MakeLeaf(AST.NkIdent, "HIGH"))
- 3079     ELSE AST.SetChild(astNode, 0,
- 3080       AST.MakeLeaf(AST.NkIdent, "LEN")) END;
- 3081     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3082     astCur := astNode; astIsLit := TRUE;
- 3083                                             IF (dt # SymTab.InvalidType)
- 3084    AND (SymTab.ClassOf(dt) = SymTab.ClUStr) THEN
- 3085                                               (* UString: the count is
- 3086                                                  the descriptor header *)
- 3087                                               IF isHigh THEN
- 3088                                                 QbeGen.UStrLen(qd, qr);
- 3089                                                 QbeGen.DecQ(qr)
- 3090                                               ELSE
- 3091                                                 QbeGen.UStrLen(qd, qr)
- 3092                                               END;
- 3093                                               t := SymTab.IntType();
- 3094                                               QbeGen.CopyOp(qr, q)
- 3095                                             ELSIF (dt # SymTab.InvalidType)
- 3096    AND (SymTab.ClassOf(dt) = SymTab.ClUChar) THEN
- 3097                                               (* single UCHAR codepoint *)
- 3098                                               IF isHigh THEN
- 3099                                                 QbeGen.CopyOp("0", qr)
- 3100                                               ELSE
- 3101                                                 QbeGen.CopyOp("1", qr)
- 3102                                               END;
- 3103                                               t := SymTab.IntType();
- 3104                                               QbeGen.CopyOp(qr, q)
- 3105                                             ELSIF isStr THEN
- 3106                                               (* fold: content length at
- 3107                                                  compile time *)
- 3108                                               IF SymTab.StrLen(s) = 3 THEN
- 3109                                                 c1 := 1
- 3110                                               ELSE
- 3111                                                 c1 :=
- 3112                                                   SymTab.StrLen(s) - 2
- 3113                                               END;
- 3114                                               IF isHigh THEN
- 3115                                                 DEC(c1)
- 3116                                               END;
- 3117                                               QbeGen.IntStr(c1, qr);
- 3118                                               t := SymTab.IntType();
- 3119                                               QbeGen.CopyOp(qr, q)
- 3120                                             ELSIF dt = SymTab.InvalidType THEN
- 3121                                               t := SymTab.InvalidType;
- 3122                                               QbeGen.CopyOp("0", q)
- 3123                                             ELSIF SymTab.ClassOf(dt) #
- 3124                                                   SymTab.ClArray THEN
- 3125                                               SemError(217);
- 3126                                               t := SymTab.InvalidType;
- 3127                                               QbeGen.CopyOp("0", q)
- 3128                                             ELSE
- 3129                                               IF isHigh THEN
- 3130                                                 IF SymTab.IsOpenArray(dt) THEN
- 3131                                                   QbeGen.OpenHi(qd, qr)
- 3132                                                 ELSE
- 3133                                                   QbeGen.IntStr(
- 3134                                                     SymTab.ArrayHi(dt), qr)
- 3135                                                 END
- 3136                                               ELSE
- 3137                                                 IF SymTab.IsOpenArray(dt) THEN
- 3138                                                   QbeGen.LoadCount(qd, qr)
- 3139                                                 ELSE
- 3140                                                   QbeGen.IntStr(VAL(
- 3141                                                     INTEGER,
- 3142                                                     SymTab.ArrayLen(dt)),
- 3143                                                     qr)
- 3144                                                 END
- 3145                                               END;
- 3146                                                t := SymTab.IntType();
- 3147                                                QbeGen.CopyOp(qr, q)
- 3148                                              END; .)
- 3149      | ( "SIZE" | "TSIZE" ) "(" Design<dt, dk, qd, qn, sfx> ")"
- 3150      (. astNode := AST.MakeNode(AST.NkCall);
- 3151     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "SIZE"));
- 3152     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3153     astCur := astNode; astIsLit := TRUE; .)
- 3154                                          (. IF dt = SymTab.InvalidType THEN
- 3155                                               t := SymTab.InvalidType;
- 3156                                               QbeGen.CopyOp("0", q)
- 3157                                             ELSE
- 3158                                               QbeGen.IntStr(VAL(INTEGER,
- 3159                                                 SymTab.ObjectSize(dt)), q);
- 3160                                               t := SymTab.IntType()
- 3161                                             END; .)
- 3162      | ( "SHIFT"                         (. isMax := FALSE; .)
- 3163        | "ROTATE"                        (. isMax := TRUE; .) )
- 3164        "(" Expr<et, q> (. astArg2 := astCur; .) "," Expr<et2, q2> ")"
- 3165                                          (. astNode := AST.MakeNode(AST.NkCall);
- 3166     IF isMax THEN AST.SetChild(astNode, 0,
- 3167       AST.MakeLeaf(AST.NkIdent, "ROTATE"))
- 3168     ELSE AST.SetChild(astNode, 0,
- 3169       AST.MakeLeaf(AST.NkIdent, "SHIFT")) END;
- 3170     IF astArg2 # AST.NoNode THEN AST.SetChild(astNode, 1, astArg2) END;
- 3171     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 2, astCur) END;
- 3172     astCur := astNode; astIsLit := TRUE;
- 3173                                             (* set shift/rotate: isMax
- 3174                                                doubles as "rotate" *)
- 3175                                             IF (et # SymTab.InvalidType)
- 3176                                                AND (SymTab.ClassOf(et) =
- 3177                                                   SymTab.ClSet) THEN
- 3178                                               QbeGen.SetShift(q, q2,
- 3179                                                 SymTab.SetWords(et),
- 3180                                                 SymTab.SetCount(et), isMax,
- 3181                                                 qt);
- 3182                                               t := et;
- 3183                                               QbeGen.CopyOp(qt, q)
- 3184                                             ELSE SemError(230);
- 3185                                               t := SymTab.InvalidType;
- 3186                                               QbeGen.CopyOp("0", q)
- 3187                                             END; .)
- 3188      | ( "MIN"                           (. isMax := FALSE; .)
- 3189        | "MAX"                           (. isMax := TRUE; .) )
- 3190        "(" Design<dt, dk, qd, qn, sfx> ")"
- 3191                                          (. astNode := AST.MakeNode(AST.NkCall);
- 3192     IF isMax THEN AST.SetChild(astNode, 0,
- 3193       AST.MakeLeaf(AST.NkIdent, "MAX"))
- 3194     ELSE AST.SetChild(astNode, 0,
- 3195       AST.MakeLeaf(AST.NkIdent, "MIN")) END;
- 3196     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3197     astCur := astNode; astIsLit := TRUE;
- 3198                                             IF (dt # SymTab.InvalidType)
- 3199   AND (SymTab.ClassOf(dt) = SymTab.ClReal) THEN
- 3200                                               (* REAL/LONGREAL: the
- 3201                                                  implementation bounds *)
- 3202                                               IF isMax THEN
- 3203                                                 QbeGen.NormReal(
- 3204                                                   "3.402823e38", q)
- 3205                                               ELSE QbeGen.NormReal(
- 3206                                                   "-3.402823e38", q)
- 3207                                               END;
- 3208                                               t := SymTab.RealType()
- 3209                                             ELSIF (dt #
- 3210                                                SymTab.InvalidType)
- 3211   AND (SymTab.ClassOf(dt) =
- 3212                                                   SymTab.ClLong) THEN
- 3213                                               IF isMax THEN
- 3214                                                 QbeGen.CopyOp(
- 3215                                                   "9223372036854775807", q)
- 3216                                               ELSE QbeGen.CopyOp(
- 3217                                                   "-9223372036854775808", q)
- 3218                                               END;
- 3219                                               t := SymTab.LongType()
- 3220                                             ELSIF SymTab.TypeBounds(dt, lo,
- 3221                                                      hi) THEN
- 3222                                               IF isMax THEN
- 3223                                                 QbeGen.IntStr(hi, q)
- 3224                                               ELSE QbeGen.IntStr(lo, q)
- 3225                                               END;
- 3226                                               t := SymTab.IntType()
- 3227                                             ELSE SemError(230);
- 3228                                               t := SymTab.InvalidType;
- 3229                                               QbeGen.CopyOp("0", q)
- 3230                                             END; .)
- 3231      | "ADR" "(" Design<dt, dk, qd, qn, sfx> ")"
- 3232      (. astNode := AST.MakeNode(AST.NkCall);
- 3233     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ADR"));
+ 2986                                                  OR (SymTab.ClassOf(dt) =
+ 2987                                                      SymTab.ClSet)
+ 2988                                                  OR (SymTab.ClassOf(dt) =
+ 2989                                                      SymTab.ClArray)
+ 2990                                                  OR (SymTab.ClassOf(dt) =
+ 2991                                                      SymTab.ClClass) THEN
+ 2992                                                 QbeGen.CopyOp(qd, q)
+ 2993                                               ELSE QbeGen.ElemLoad(qd, dt,
+ 2994                                                 q)
+ 2995                                               END
+ 2996                                             ELSE QbeGen.CopyOp(qd, q)
+ 2997                                             END;
+ 2998                                             IF (dk = SymTab.KindVar)
+ 2999                                                OR (dk = SymTab.KindParam)
+ 3000                                                OR (dk =
+ 3001                                                   SymTab.KindField) THEN
+ 3002                                               IF sfx THEN
+ 3003                                                 QbeGen.NoteAddr(q, qd)
+ 3004                                               ELSE
+ 3005                                                 QbeGen.AddrOf(qn, qa);
+ 3006                                                 QbeGen.NoteAddr(q, qa)
+ 3007                                               END
+ 3008                                             ELSIF sfx
+ 3009   AND (dt #
+ 3010                                                   SymTab.InvalidType)
+ 3011   AND ((SymTab.ClassOf(dt) =
+ 3012                                                    SymTab.ClArray)
+ 3013                                                   OR (SymTab.ClassOf(dt) =
+ 3014                                                       SymTab.ClSet)
+ 3015                                                   OR (SymTab.ClassOf(dt) =
+ 3016                                                       SymTab.ClRecord)) THEN
+ 3017                                               QbeGen.NoteAddr(qd, qd)
+ 3018                                             END; .)
+ 3019        [ TypedBraceLit<dt, q>            (. t := dt; astCall := TRUE;
+ 3020                                               astBrace := astCur; .) ]
+ 3021        [ ArgList<qn, dt, qd, TRUE, FALSE, methCls, ct2, q2, called>
+ 3022                                          (. astCall := TRUE;
+ 3023                                             astNode := AstCallNode(astD);
+ 3024                                             astRes := astNode;
+ 3025                                             t := ct2;
+ 3026                                             QbeGen.CopyOp(q2, q);
+ 3027                                             sfx := FALSE; .)
+ 3028          { ResultComp<t, q, sfx, astRes> }
+ 3029                                          (. IF sfx THEN
+ 3030                                               IF t = SymTab.InvalidType THEN
+ 3031                                                 QbeGen.CopyOp("0", q)
+ 3032                                               ELSIF (SymTab.ClassOf(t) #
+ 3033                                                      SymTab.ClRecord)
+ 3034    AND (SymTab.ClassOf(t) # SymTab.ClSet)
+ 3035    AND (SymTab.ClassOf(t) # SymTab.ClArray)
+ 3036    AND (SymTab.ClassOf(t) # SymTab.ClClass) THEN
+ 3037                                                 QbeGen.ElemLoad(q, t, q2);
+ 3038                                                 QbeGen.CopyOp(q2, q)
+ 3039                                               END
+ 3040                                             END; .) ]
+ 3041                                          (. IF called THEN
+ 3042                                               astCur := astRes
+ 3043                                             ELSIF astCall THEN
+ 3044                                               astCur := astBrace
+ 3045                                             ELSE astCur := astD
+ 3046                                             END;
+ 3047                                              astIsLit := TRUE;
+ 3048                                              IF NOT called
+ 3049   AND (dk = SymTab.KindProc) THEN
+ 3050                                               (* bare zero-arg function
+ 3051                                                  call (parentheses may be
+ 3052                                                  omitted); a proper or
+ 3053                                                  parameterised proc here
+ 3054                                                  is 230 *)
+ 3055                                               IF (SymTab.ProcNPar(qn) = 0)
+ 3056   AND (SymTab.ProcRes(qn) #
+ 3057                                                     SymTab.InvalidType) THEN
+ 3058                                                 QbeGen.Mangled(qn,
+ 3059                                                   SymTab.ProcUid(qn), qm0);
+ 3060                                                 QbeGen.CallBegin(qm0,
+ 3061                                                   SymTab.ProcRes(qn),
+ 3062                                                   SymTab.ProcDepthOf(qn),
+ 3063                                                   SymTab.IsExternal(qn));
+ 3064                                                 QbeGen.CallEnd(TRUE, q);
+ 3065                                                 t := SymTab.ProcRes(qn)
+ 3066                                               ELSE
+ 3067                                                 (* procedure used as a
+ 3068                                                    value (assign to a
+ 3069                                                    procedure variable):
+ 3070                                                    its code address *)
+ 3071                                                 t := SymTab.ProcTypeOf(qn);
+ 3072                                                 QbeGen.Mangled(qn,
+ 3073                                                   SymTab.ProcUid(qn), qm0);
+ 3074                                                 QbeGen.ProcAddr(qm0, q)
+ 3075                                               END
+ 3076                                             END; .)
+ 3077      | ( "HIGH"                          (. isHigh := TRUE; .)
+ 3078        | ( "LEN" | "LENGTH" )            (. isHigh := FALSE; .) )
+ 3079        "(" ( Design<dt, dk, qd, qn, sfx> (. isStr := FALSE;
+ 3080                                              isU := FALSE; .)
+ 3081            | string                       (. LexString(s); astCur := AST.MakeLeaf(AST.NkStrLit, s);
+ 3082                                              isStr := TRUE;
+ 3083                                              isU := FALSE;
+ 3084                                              IF SymTab.StrLen(s) = 3 THEN
+ 3085                                                dt := SymTab.CharType();
+ 3086                                                QbeGen.IntStr(QbeGen.CharVal(s),
+ 3087                                                  qd)
+ 3088                                              ELSE
+ 3089                                                dt := SymTab.NewStr();
+ 3090                                                QbeGen.DeclStr(s, qd);
+ 3091                                                QbeGen.NoteAddr(qd, qd)
+ 3092                                              END;
+ 3093                                              dk := -1;
+ 3094                                              qn[0] := CHR(0); .)
+ 3095            | ustring                      (. LexString(s); astCur := AST.MakeLeaf(AST.NkStrLit, s);
+ 3096                                              QbeGen.DeclUStr(s, qd, isU, ucp,
+ 3097                                                uok);
+ 3098                                              isStr := FALSE;
+ 3099                                              IF NOT uok THEN
+ 3100                                                SemError(234);
+ 3101                                                dt := SymTab.InvalidType
+ 3102                                              ELSIF isU THEN
+ 3103                                                (* one codepoint: a UCHAR;
+ 3104                                                   LEN is 1, HIGH is 0 *)
+ 3105                                                dt := SymTab.UCharType();
+ 3106                                                QbeGen.IntStr(ucp, qd)
+ 3107                                              ELSE
+ 3108                                                dt := SymTab.NewUStr();
+ 3109                                                QbeGen.NoteAddr(qd, qd)
+ 3110                                              END;
+ 3111                                              dk := -1;
+ 3112                                              qn[0] := CHR(0); .) )
+ 3113        ")"
+ 3114                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 3115     IF isHigh THEN AST.SetChild(astNode, 0,
+ 3116       AST.MakeLeaf(AST.NkIdent, "HIGH"))
+ 3117     ELSE AST.SetChild(astNode, 0,
+ 3118       AST.MakeLeaf(AST.NkIdent, "LEN")) END;
+ 3119     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3120     astCur := astNode; astIsLit := TRUE;
+ 3121                                             IF (dt # SymTab.InvalidType)
+ 3122    AND (SymTab.ClassOf(dt) = SymTab.ClUStr) THEN
+ 3123                                               (* UString: the count is
+ 3124                                                  the descriptor header *)
+ 3125                                               IF isHigh THEN
+ 3126                                                 QbeGen.UStrLen(qd, qr);
+ 3127                                                 QbeGen.DecQ(qr)
+ 3128                                               ELSE
+ 3129                                                 QbeGen.UStrLen(qd, qr)
+ 3130                                               END;
+ 3131                                               t := SymTab.IntType();
+ 3132                                               QbeGen.CopyOp(qr, q)
+ 3133                                             ELSIF (dt # SymTab.InvalidType)
+ 3134    AND (SymTab.ClassOf(dt) = SymTab.ClUChar) THEN
+ 3135                                               (* single UCHAR codepoint *)
+ 3136                                               IF isHigh THEN
+ 3137                                                 QbeGen.CopyOp("0", qr)
+ 3138                                               ELSE
+ 3139                                                 QbeGen.CopyOp("1", qr)
+ 3140                                               END;
+ 3141                                               t := SymTab.IntType();
+ 3142                                               QbeGen.CopyOp(qr, q)
+ 3143                                             ELSIF isStr THEN
+ 3144                                               (* fold: content length at
+ 3145                                                  compile time *)
+ 3146                                               IF SymTab.StrLen(s) = 3 THEN
+ 3147                                                 c1 := 1
+ 3148                                               ELSE
+ 3149                                                 c1 :=
+ 3150                                                   SymTab.StrLen(s) - 2
+ 3151                                               END;
+ 3152                                               IF isHigh THEN
+ 3153                                                 DEC(c1)
+ 3154                                               END;
+ 3155                                               QbeGen.IntStr(c1, qr);
+ 3156                                               t := SymTab.IntType();
+ 3157                                               QbeGen.CopyOp(qr, q)
+ 3158                                             ELSIF dt = SymTab.InvalidType THEN
+ 3159                                               t := SymTab.InvalidType;
+ 3160                                               QbeGen.CopyOp("0", q)
+ 3161                                             ELSIF SymTab.ClassOf(dt) #
+ 3162                                                   SymTab.ClArray THEN
+ 3163                                               SemError(217);
+ 3164                                               t := SymTab.InvalidType;
+ 3165                                               QbeGen.CopyOp("0", q)
+ 3166                                             ELSE
+ 3167                                               IF isHigh THEN
+ 3168                                                 IF SymTab.IsOpenArray(dt) THEN
+ 3169                                                   QbeGen.OpenHi(qd, qr)
+ 3170                                                 ELSE
+ 3171                                                   QbeGen.IntStr(
+ 3172                                                     SymTab.ArrayHi(dt), qr)
+ 3173                                                 END
+ 3174                                               ELSE
+ 3175                                                 IF SymTab.IsOpenArray(dt) THEN
+ 3176                                                   QbeGen.LoadCount(qd, qr)
+ 3177                                                 ELSE
+ 3178                                                   QbeGen.IntStr(VAL(
+ 3179                                                     INTEGER,
+ 3180                                                     SymTab.ArrayLen(dt)),
+ 3181                                                     qr)
+ 3182                                                 END
+ 3183                                               END;
+ 3184                                                t := SymTab.IntType();
+ 3185                                                QbeGen.CopyOp(qr, q)
+ 3186                                              END; .)
+ 3187      | ( "SIZE" | "TSIZE" ) "(" Design<dt, dk, qd, qn, sfx> ")"
+ 3188      (. astNode := AST.MakeNode(AST.NkCall);
+ 3189     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "SIZE"));
+ 3190     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3191     astCur := astNode; astIsLit := TRUE; .)
+ 3192                                          (. IF dt = SymTab.InvalidType THEN
+ 3193                                               t := SymTab.InvalidType;
+ 3194                                               QbeGen.CopyOp("0", q)
+ 3195                                             ELSE
+ 3196                                               QbeGen.IntStr(VAL(INTEGER,
+ 3197                                                 SymTab.ObjectSize(dt)), q);
+ 3198                                               t := SymTab.IntType()
+ 3199                                             END; .)
+ 3200      | ( "SHIFT"                         (. isMax := FALSE; .)
+ 3201        | "ROTATE"                        (. isMax := TRUE; .) )
+ 3202        "(" Expr<et, q> (. astArg2 := astCur; .) "," Expr<et2, q2> ")"
+ 3203                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 3204     IF isMax THEN AST.SetChild(astNode, 0,
+ 3205       AST.MakeLeaf(AST.NkIdent, "ROTATE"))
+ 3206     ELSE AST.SetChild(astNode, 0,
+ 3207       AST.MakeLeaf(AST.NkIdent, "SHIFT")) END;
+ 3208     IF astArg2 # AST.NoNode THEN AST.SetChild(astNode, 1, astArg2) END;
+ 3209     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 2, astCur) END;
+ 3210     astCur := astNode; astIsLit := TRUE;
+ 3211                                             (* set shift/rotate: isMax
+ 3212                                                doubles as "rotate" *)
+ 3213                                             IF (et # SymTab.InvalidType)
+ 3214                                                AND (SymTab.ClassOf(et) =
+ 3215                                                   SymTab.ClSet) THEN
+ 3216                                               QbeGen.SetShift(q, q2,
+ 3217                                                 SymTab.SetWords(et),
+ 3218                                                 SymTab.SetCount(et), isMax,
+ 3219                                                 qt);
+ 3220                                               t := et;
+ 3221                                               QbeGen.CopyOp(qt, q)
+ 3222                                             ELSE SemError(230);
+ 3223                                               t := SymTab.InvalidType;
+ 3224                                               QbeGen.CopyOp("0", q)
+ 3225                                             END; .)
+ 3226      | ( "MIN"                           (. isMax := FALSE; .)
+ 3227        | "MAX"                           (. isMax := TRUE; .) )
+ 3228        "(" Design<dt, dk, qd, qn, sfx> ")"
+ 3229                                          (. astNode := AST.MakeNode(AST.NkCall);
+ 3230     IF isMax THEN AST.SetChild(astNode, 0,
+ 3231       AST.MakeLeaf(AST.NkIdent, "MAX"))
+ 3232     ELSE AST.SetChild(astNode, 0,
+ 3233       AST.MakeLeaf(AST.NkIdent, "MIN")) END;
  3234     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3235     astCur := astNode; astIsLit := TRUE; .)
- 3236                                          (. IF dt = SymTab.InvalidType THEN
- 3237                                               t := SymTab.InvalidType;
- 3238                                               QbeGen.CopyOp("0", q)
- 3239                                             ELSE
- 3240                                               IF sfx THEN
- 3241                                                 QbeGen.CopyOp(qd, q)
- 3242                                               ELSIF (dk = SymTab.KindVar)
- 3243                                                  OR (dk = SymTab.KindParam) THEN
- 3244                                                 QbeGen.AddrOf(qn, q)
- 3245                                               ELSE SemError(230);
- 3246                                                 QbeGen.CopyOp("0", q)
- 3247                                               END;
- 3248                                               t := SymTab.AddrType()
- 3249                                             END; .)
- 3250      | "CHR" "(" Expr<et, q> ")"
- 3251      (. astNode := AST.MakeNode(AST.NkCall);
- 3252     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CHR"));
- 3253     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3254     astCur := astNode; astIsLit := TRUE; .)
- 3255                                          (. IF (et # SymTab.InvalidType)
- 3256   AND NOT SymTab.IsIntFamily(et) THEN
- 3257                                               SemError(211) END;
- 3258                                             t := SymTab.CharType(); .)
- 3259      | ( "ORD" | "ORDL" ) "(" Expr<et, q> ")"
- 3260      (. astNode := AST.MakeNode(AST.NkCall);
- 3261     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ORD"));
- 3262     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3263     astCur := astNode; astIsLit := TRUE; .)
- 3264                                          (. IF et # SymTab.InvalidType THEN
- 3265                                               IF (SymTab.ClassOf(et) #
- 3266                                                   SymTab.ClChar)
- 3267   AND (SymTab.ClassOf(et) #
- 3268                                                     SymTab.ClBool)
- 3269   AND (SymTab.ClassOf(et) #
- 3270                                                     SymTab.ClEnum)
- 3271   AND NOT SymTab.IsIntFamily(et) THEN
- 3272                                                 SemError(211) END
- 3273                                             END;
- 3274                                             t := SymTab.IntType(); .)
- 3275      | "CAP" "(" Expr<et, q> ")"
- 3276      (. astNode := AST.MakeNode(AST.NkCall);
- 3277     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CAP"));
- 3278     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3279     astCur := astNode; astIsLit := TRUE; .)
- 3280                                          (. QbeGen.CapQ(q, qa);
- 3281                                             QbeGen.CopyOp(qa, q);
- 3282                                             t := SymTab.CharType(); .)
- 3283      | "UCHR" "(" Expr<et, q> ")"
- 3284      (. astNode := AST.MakeNode(AST.NkCall);
- 3285     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "UCHR"));
- 3286     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3287     astCur := astNode; astIsLit := TRUE; .)
- 3288                                          (. (* UCHR: the UCHAR constructor.
- 3289                                                CHAR -> UCHAR (identity);
- 3290                                                INTEGER familly -> UCHAR
- 3291                                                (codepoint value). *)
- 3292                                             IF (et # SymTab.InvalidType)
- 3293    AND (SymTab.ClassOf(et) # SymTab.ClChar)
- 3294    AND NOT SymTab.IsIntFamily(et) THEN
+ 3235     astCur := astNode; astIsLit := TRUE;
+ 3236                                             IF (dt # SymTab.InvalidType)
+ 3237   AND (SymTab.ClassOf(dt) = SymTab.ClReal) THEN
+ 3238                                               (* REAL/LONGREAL: the
+ 3239                                                  implementation bounds *)
+ 3240                                               IF isMax THEN
+ 3241                                                 QbeGen.NormReal(
+ 3242                                                   "3.402823e38", q)
+ 3243                                               ELSE QbeGen.NormReal(
+ 3244                                                   "-3.402823e38", q)
+ 3245                                               END;
+ 3246                                               t := SymTab.RealType()
+ 3247                                             ELSIF (dt #
+ 3248                                                SymTab.InvalidType)
+ 3249   AND (SymTab.ClassOf(dt) =
+ 3250                                                   SymTab.ClLong) THEN
+ 3251                                               IF isMax THEN
+ 3252                                                 QbeGen.CopyOp(
+ 3253                                                   "9223372036854775807", q)
+ 3254                                               ELSE QbeGen.CopyOp(
+ 3255                                                   "-9223372036854775808", q)
+ 3256                                               END;
+ 3257                                               t := SymTab.LongType()
+ 3258                                             ELSIF SymTab.TypeBounds(dt, lo,
+ 3259                                                      hi) THEN
+ 3260                                               IF isMax THEN
+ 3261                                                 QbeGen.IntStr(hi, q)
+ 3262                                               ELSE QbeGen.IntStr(lo, q)
+ 3263                                               END;
+ 3264                                               t := SymTab.IntType()
+ 3265                                             ELSE SemError(230);
+ 3266                                               t := SymTab.InvalidType;
+ 3267                                               QbeGen.CopyOp("0", q)
+ 3268                                             END; .)
+ 3269      | "ADR" "(" Design<dt, dk, qd, qn, sfx> ")"
+ 3270      (. astNode := AST.MakeNode(AST.NkCall);
+ 3271     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ADR"));
+ 3272     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3273     astCur := astNode; astIsLit := TRUE; .)
+ 3274                                          (. IF dt = SymTab.InvalidType THEN
+ 3275                                               t := SymTab.InvalidType;
+ 3276                                               QbeGen.CopyOp("0", q)
+ 3277                                             ELSE
+ 3278                                               IF sfx THEN
+ 3279                                                 QbeGen.CopyOp(qd, q)
+ 3280                                               ELSIF (dk = SymTab.KindVar)
+ 3281                                                  OR (dk = SymTab.KindParam) THEN
+ 3282                                                 QbeGen.AddrOf(qn, q)
+ 3283                                               ELSE SemError(230);
+ 3284                                                 QbeGen.CopyOp("0", q)
+ 3285                                               END;
+ 3286                                               t := SymTab.AddrType()
+ 3287                                             END; .)
+ 3288      | "CHR" "(" Expr<et, q> ")"
+ 3289      (. astNode := AST.MakeNode(AST.NkCall);
+ 3290     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CHR"));
+ 3291     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3292     astCur := astNode; astIsLit := TRUE; .)
+ 3293                                          (. IF (et # SymTab.InvalidType)
+ 3294   AND NOT SymTab.IsIntFamily(et) THEN
  3295                                               SemError(211) END;
- 3296                                             t := SymTab.UCharType(); .)
- 3297      | "CHR8" "(" Expr<et, q> ")"
+ 3296                                             t := SymTab.CharType(); .)
+ 3297      | ( "ORD" | "ORDL" ) "(" Expr<et, q> ")"
  3298      (. astNode := AST.MakeNode(AST.NkCall);
- 3299     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CHR8"));
+ 3299     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ORD"));
  3300     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
  3301     astCur := astNode; astIsLit := TRUE; .)
- 3302                                          (. IF (et # SymTab.InvalidType)
- 3303    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
- 3304                                               SemError(211) END;
- 3305                                             QbeGen.WidenLong(q, qa);
- 3306                                             QbeGen.CheckRange(qa, "0", "255");
- 3307                                             t := SymTab.CharType(); .)
- 3308      | "UORD" "(" Expr<et, q> ")"
- 3309      (. astNode := AST.MakeNode(AST.NkCall);
- 3310     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "UORD"));
- 3311     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3312     astCur := astNode; astIsLit := TRUE; .)
- 3313                                          (. (* UORD(u): the codepoint as a
- 3314                                                32-bit ordinal (INTEGER),
- 3315                                                cf. ORD for CHAR. *)
- 3316                                             IF (et # SymTab.InvalidType)
- 3317    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
- 3318                                               SemError(211) END;
- 3319                                             t := SymTab.IntType(); .)
- 3320      | "ABS" "(" Expr<et, q> ")"
- 3321      (. astNode := AST.MakeNode(AST.NkCall);
- 3322     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ABS"));
- 3323     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
- 3324     astCur := astNode; astIsLit := TRUE; .)
- 3325                                          (. IF (et # SymTab.InvalidType)
- 3326   AND NOT SymTab.IsIntFamily(et)
- 3327   AND (SymTab.ClassOf(et) #
- 3328                                                  SymTab.ClReal) THEN
- 3329                                               SemError(211)
- 3330                                             ELSE QbeGen.AbsQ(q, qa,
- 3331                                                    SymTab.ClassOf(et) =
- 3332                                                      SymTab.ClReal);
- 3333                                               QbeGen.CopyOp(qa, q)
- 3334                                             END;
- 3335                                             t := et; .)
- 3336      | "VAL" "(" GetIdent<vn> (. astArg2 := AST.MakeLeaf(AST.NkIdent, vn); .) "," Expr<et, q> ")"
- 3337      (. astNode := AST.MakeNode(AST.NkCall);
- 3338     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "VAL"));
- 3339     IF astArg2 # AST.NoNode THEN AST.SetChild(astNode, 1, astArg2) END;
- 3340     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 2, astCur) END;
- 3341     astCur := astNode; astIsLit := TRUE; .)
- 3342                                          (. IF NOT SymTab.Lookup(vn) THEN
- 3343                                               SemError(201);
- 3344                                               t := SymTab.InvalidType
- 3345                                             ELSE vt := SymTab.SymType(vn);
- 3346                                               IF vt = SymTab.InvalidType THEN
- 3347                                                 t := SymTab.InvalidType
- 3348                                               ELSIF et =
- 3349                                                  SymTab.InvalidType THEN
- 3350                                                 t := vt
- 3351                                               ELSE
- 3352                                                 c1 := SymTab.ClassOf(et);
- 3353                                                 c2 := SymTab.ClassOf(vt);
- 3354                                                 IF (c1 = SymTab.ClInt)
- 3355    AND (c2 = SymTab.ClLong) THEN
- 3356                                                   QbeGen.WidenLong(q, qa);
- 3357                                                   QbeGen.CopyOp(qa, q);
- 3358                                                   t := vt
- 3359                                                 ELSIF (c1 = SymTab.ClLong)
- 3360    AND (c2 = SymTab.ClInt) THEN
- 3361                                                   QbeGen.NarrowLong(q, qa);
- 3362                                                   QbeGen.CopyOp(qa, q);
- 3363                                                   t := vt
- 3364                                                 ELSIF (c1 = SymTab.ClInt)
- 3365    AND (c2 = SymTab.ClReal) THEN
- 3366                                                   QbeGen.ConvIR(q, qa);
- 3367                                                   QbeGen.CopyOp(qa, q);
- 3368                                                   t := vt
- 3369                                                 ELSIF (c1 = SymTab.ClLong)
- 3370    AND (c2 = SymTab.ClReal) THEN
- 3371                                                   QbeGen.ConvLR(q, qa);
- 3372                                                   QbeGen.CopyOp(qa, q);
- 3373                                                   t := vt
- 3374                                                 ELSIF (c1 = SymTab.ClReal)
- 3375    AND (c2 = SymTab.ClInt) THEN
- 3376                                                   QbeGen.ConvRI(q, qa);
- 3377                                                   QbeGen.CopyOp(qa, q);
- 3378                                                   t := vt
- 3379                                                 ELSIF (c1 = SymTab.ClReal)
- 3380    AND (c2 = SymTab.ClLong) THEN
- 3381                                                   QbeGen.ConvRL(q, qa);
- 3382                                                   QbeGen.CopyOp(qa, q);
- 3383                                                   t := vt
- 3384                                                 ELSIF ((c1 = SymTab.ClInt)
- 3385                                                     OR (c1 =
- 3386                                                        SymTab.ClChar)
- 3387                                                     OR (c1 =
- 3388                                                        SymTab.ClBool)
- 3389                                                     OR (c1 =
- 3390                                                        SymTab.ClEnum))
- 3391   AND ((c2 = SymTab.ClInt)
- 3392                                                     OR (c2 =
- 3393                                                        SymTab.ClChar)
- 3394                                                     OR (c2 =
- 3395                                                        SymTab.ClBool)
- 3396                                                     OR (c2 =
- 3397                                                        SymTab.ClEnum)) THEN
- 3398                                                   t := vt
- 3399                                                 ELSIF (c1 = SymTab.ClPtr)
- 3400   AND (c2 = SymTab.ClPtr) THEN
+ 3302                                          (. IF et # SymTab.InvalidType THEN
+ 3303                                               IF (SymTab.ClassOf(et) #
+ 3304                                                   SymTab.ClChar)
+ 3305   AND (SymTab.ClassOf(et) #
+ 3306                                                     SymTab.ClBool)
+ 3307   AND (SymTab.ClassOf(et) #
+ 3308                                                     SymTab.ClEnum)
+ 3309   AND NOT SymTab.IsIntFamily(et) THEN
+ 3310                                                 SemError(211) END
+ 3311                                             END;
+ 3312                                             t := SymTab.IntType(); .)
+ 3313      | "CAP" "(" Expr<et, q> ")"
+ 3314      (. astNode := AST.MakeNode(AST.NkCall);
+ 3315     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CAP"));
+ 3316     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3317     astCur := astNode; astIsLit := TRUE; .)
+ 3318                                          (. QbeGen.CapQ(q, qa);
+ 3319                                             QbeGen.CopyOp(qa, q);
+ 3320                                             t := SymTab.CharType(); .)
+ 3321      | "UCHR" "(" Expr<et, q> ")"
+ 3322      (. astNode := AST.MakeNode(AST.NkCall);
+ 3323     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "UCHR"));
+ 3324     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3325     astCur := astNode; astIsLit := TRUE; .)
+ 3326                                          (. (* UCHR: the UCHAR constructor.
+ 3327                                                CHAR -> UCHAR (identity);
+ 3328                                                INTEGER familly -> UCHAR
+ 3329                                                (codepoint value). *)
+ 3330                                             IF (et # SymTab.InvalidType)
+ 3331    AND (SymTab.ClassOf(et) # SymTab.ClChar)
+ 3332    AND NOT SymTab.IsIntFamily(et) THEN
+ 3333                                               SemError(211) END;
+ 3334                                             t := SymTab.UCharType(); .)
+ 3335      | "CHR8" "(" Expr<et, q> ")"
+ 3336      (. astNode := AST.MakeNode(AST.NkCall);
+ 3337     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "CHR8"));
+ 3338     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3339     astCur := astNode; astIsLit := TRUE; .)
+ 3340                                          (. IF (et # SymTab.InvalidType)
+ 3341    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
+ 3342                                               SemError(211) END;
+ 3343                                             QbeGen.WidenLong(q, qa);
+ 3344                                             QbeGen.CheckRange(qa, "0", "255");
+ 3345                                             t := SymTab.CharType(); .)
+ 3346      | "UORD" "(" Expr<et, q> ")"
+ 3347      (. astNode := AST.MakeNode(AST.NkCall);
+ 3348     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "UORD"));
+ 3349     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3350     astCur := astNode; astIsLit := TRUE; .)
+ 3351                                          (. (* UORD(u): the codepoint as a
+ 3352                                                32-bit ordinal (INTEGER),
+ 3353                                                cf. ORD for CHAR. *)
+ 3354                                             IF (et # SymTab.InvalidType)
+ 3355    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
+ 3356                                               SemError(211) END;
+ 3357                                             t := SymTab.IntType(); .)
+ 3358      | "ABS" "(" Expr<et, q> ")"
+ 3359      (. astNode := AST.MakeNode(AST.NkCall);
+ 3360     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "ABS"));
+ 3361     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 1, astCur) END;
+ 3362     astCur := astNode; astIsLit := TRUE; .)
+ 3363                                          (. IF (et # SymTab.InvalidType)
+ 3364   AND NOT SymTab.IsIntFamily(et)
+ 3365   AND (SymTab.ClassOf(et) #
+ 3366                                                  SymTab.ClReal) THEN
+ 3367                                               SemError(211)
+ 3368                                             ELSE QbeGen.AbsQ(q, qa,
+ 3369                                                    SymTab.ClassOf(et) =
+ 3370                                                      SymTab.ClReal);
+ 3371                                               QbeGen.CopyOp(qa, q)
+ 3372                                             END;
+ 3373                                             t := et; .)
+ 3374      | "VAL" "(" GetIdent<vn> (. astArg2 := AST.MakeLeaf(AST.NkIdent, vn); .) "," Expr<et, q> ")"
+ 3375      (. astNode := AST.MakeNode(AST.NkCall);
+ 3376     AST.SetChild(astNode, 0, AST.MakeLeaf(AST.NkIdent, "VAL"));
+ 3377     IF astArg2 # AST.NoNode THEN AST.SetChild(astNode, 1, astArg2) END;
+ 3378     IF astCur # AST.NoNode THEN AST.SetChild(astNode, 2, astCur) END;
+ 3379     astCur := astNode; astIsLit := TRUE; .)
+ 3380                                          (. IF NOT SymTab.Lookup(vn) THEN
+ 3381                                               SemError(201);
+ 3382                                               t := SymTab.InvalidType
+ 3383                                             ELSE vt := SymTab.SymType(vn);
+ 3384                                               IF vt = SymTab.InvalidType THEN
+ 3385                                                 t := SymTab.InvalidType
+ 3386                                               ELSIF et =
+ 3387                                                  SymTab.InvalidType THEN
+ 3388                                                 t := vt
+ 3389                                               ELSE
+ 3390                                                 c1 := SymTab.ClassOf(et);
+ 3391                                                 c2 := SymTab.ClassOf(vt);
+ 3392                                                 IF (c1 = SymTab.ClInt)
+ 3393    AND (c2 = SymTab.ClLong) THEN
+ 3394                                                   QbeGen.WidenLong(q, qa);
+ 3395                                                   QbeGen.CopyOp(qa, q);
+ 3396                                                   t := vt
+ 3397                                                 ELSIF (c1 = SymTab.ClLong)
+ 3398    AND (c2 = SymTab.ClInt) THEN
+ 3399                                                   QbeGen.NarrowLong(q, qa);
+ 3400                                                   QbeGen.CopyOp(qa, q);
  3401                                                   t := vt
- 3402                                                 ELSIF (c1 = SymTab.ClReal)
- 3403   AND (c2 = SymTab.ClReal) THEN
- 3404                                                   t := vt
- 3405                                                 ELSE SemError(230);
- 3406                                                   t := SymTab.InvalidType
- 3407                                                 END
- 3408                                               END
- 3409                                             END; .)
- 3410      | "(" Expr<et, q> ")"               (. t := et; astIsLit := TRUE; .)
- 3411      | SetLit<st, sq>                    (. astIsLit := TRUE; t := st;
- 3412                                             QbeGen.CopyOp(sq, q); .)
- 3413      | ( "NOT" | "~" ) Fact<t2, q2>      (. astNot := astCur;
- 3414                                             IF SymTab.BoolCheck(t2) THEN
- 3415                                               t := SymTab.BoolType()
- 3416                                             ELSE SemError(212);
- 3417                                               t := SymTab.InvalidType END;
- 3418                                             IF t # SymTab.InvalidType THEN
- 3419                                               QbeGen.NotQ(q2, q)
- 3420                                             ELSE QbeGen.CopyOp("0", q)
- 3421                                             END;
- 3422                                             astIsLit := TRUE;
- 3423                                             astCur := AST.MakeUn(
- 3424                                               AST.NkUnary, AST.OpNot, astNot); .)
- 3425      )
- 3426      (. IF NOT astIsLit THEN astCur := AST.NoNode END; .) .
- 3427    (* Set literals are SET OF [0..255] (8 words); elements validated
- 3428       0..255 statically when foldable (222 otherwise), runtime trap
- 3429       for computed elements. Ranges always lower via SetRange. *)
- 3430    SetLit<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 3431                                          (. VAR astNode: AST.Node; .)
- 3432      = "{"                               (. t := SymTab.NewSet(
- 3433                                               SymTab.NewSubR(0, 255));
- 3434                                             astNode := AST.MakeNode(AST.NkSetLit);
- 3435                                             QbeGen.NewSetTemp(8, q);
- 3436                                             QbeGen.SetZero(q, 8); .)
- 3437        [ SetElem<t, q, astNode> { "," SetElem<t, q, astNode> } ]
- 3438        "}"                               (. astCur := astNode; .) .
- 3439    (* Typed brace constructor: TypeName{ elems } — BITSET{0} (a set)
- 3440       or ArrayName{...} (an array constructor, GNU Modula-2).  The
- 3441       declared type sets the width (set) or element type (array). *)
- 3442    TypedBraceLit<vt: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 3443                                          (. VAR nw: CARDINAL;
- 3444                                               astNode: AST.Node;
- 3445                                               savedCls: INTEGER; .)
- 3446      = "{"                               (. savedCls := braceCls;
- 3447                                             astNode := AST.MakeNode(AST.NkBraceLit);
- 3448                                             IF vt = SymTab.InvalidType THEN
- 3449                                               braceCls := -1
- 3450                                             ELSE braceCls :=
- 3451                                                    SymTab.ClassOf(vt)
- 3452                                             END;
- 3453                                             IF braceCls = SymTab.ClSet THEN
- 3454                                               IF vt = SymTab.InvalidType THEN
- 3455                                                 nw := 8
- 3456                                               ELSE nw := SymTab.SetWords(vt);
- 3457                                                 IF nw = 0 THEN nw := 8 END
- 3458                                               END;
- 3459                                               QbeGen.NewSetTemp(nw, q);
- 3460                                               QbeGen.SetZero(q, nw)
- 3461                                             ELSIF (braceCls =
- 3462                                                    SymTab.ClArray)
- 3463                                                OR (braceCls =
- 3464                                                    SymTab.ClRecord)
- 3465                                                OR (braceCls =
- 3466                                                    SymTab.ClClass) THEN
- 3467                                               QbeGen.CtorBegin(vt)
- 3468                                             ELSE
- 3469                                               IF vt # SymTab.InvalidType THEN
- 3470                                                 SemError(230) END;
- 3471                                               braceCls := -1
- 3472                                             END; .)
- 3473        [ BraceElem<vt, q, astNode> { "," BraceElem<vt, q, astNode> } ]
- 3474        "}"                               (. IF (braceCls = SymTab.ClArray)
- 3475                                                OR (braceCls =
- 3476                                                   SymTab.ClRecord)
- 3477                                                OR (braceCls =
- 3478                                                   SymTab.ClClass) THEN
- 3479                                               QbeGen.CtorEnd(q)
- 3480                                             ELSIF braceCls # SymTab.ClSet THEN
- 3481                                               QbeGen.CopyOp("0", q)
- 3482                                             END;
- 3483                                             braceCls := savedCls; .)
- 3484                                          (. astCur := astNode; .) .
- 3485    BraceElem<vt: SymTab.TypeIndex; VAR sq: QbeGen.QVal; node: AST.Node>
- 3486                                          (. VAR et, et2: SymTab.TypeIndex;
- 3487                                               qe, q2: QbeGen.QVal;
- 3488                                               v, v2, reps, k: INTEGER;
- 3489                                               elem: SymTab.TypeIndex;
- 3490                                               lo: INTEGER;
- 3491                                               span: CARDINAL;
- 3492                                               cl, cl2: INTEGER;
- 3493                                               hasR, hasB: BOOLEAN;
- 3494                                               astEl: AST.Node; .)
- 3495      =                                   (. hasR := FALSE; hasB := FALSE; .)
- 3496        Expr<et, qe> (. astEl := astCur; .)
- 3497        [ ".." Expr<et2, q2>              (. astEl := AST.MakeBin(
- 3498                                               AST.NkSubrange, 0, astEl, astCur);
- 3499                                             hasR := TRUE; .) ]
- 3500        [ "BY" Expr<et2, q2>              (. hasB := TRUE; .) ]
- 3501                                          (. IF braceCls = SymTab.ClSet THEN
- 3502                                               IF hasB THEN SemError(230) END;
- 3503                                               lo := SymTab.SetBaseLo(vt);
- 3504                                               span := SymTab.SetCount(vt);
- 3505                                               IF (et = SymTab.InvalidType)
- 3506                                                  OR (hasR AND (et2 =
- 3507                                                     SymTab.InvalidType)) THEN
- 3508                                               ELSE cl :=
- 3509                                                      SymTab.ClassOf(et);
- 3510                                                 IF hasR THEN
- 3511                                                   cl2 :=
- 3512                                                     SymTab.ClassOf(et2)
- 3513                                                 ELSE cl2 := SymTab.ClInt
- 3514                                                 END;
- 3515                                                 IF NOT SymTab.SetElemClassOk(cl)
- 3516                                                    OR (hasR AND NOT
- 3517                                                       SymTab.SetElemClassOk(cl2))
- 3518                                                 THEN
- 3519                                                   SemError(222)
- 3520                                                 ELSIF hasR
- 3521   AND SymTab.ConstInt(qe, v)
- 3522   AND SymTab.ConstInt(q2,
- 3523                                                       v2)
- 3524   AND ((v < lo)
- 3525                                                       OR (v2 < lo)
- 3526                                                       OR (v >= lo +
- 3527                                                          VAL(INTEGER, span))
- 3528                                                       OR (v2 >= lo +
- 3529                                                          VAL(INTEGER, span))
- 3530                                                       OR (v > v2)) THEN
- 3531                                                   SemError(222)
- 3532                                                  ELSIF hasR THEN
- 3533                                                    QbeGen.SetRange(sq, qe, q2,
- 3534                                                      lo, span)
- 3535                                                  ELSIF SymTab.ConstInt(qe,
- 3536                                                          v)
- 3537   AND ((v < lo)
- 3538                                                        OR (v >= lo +
- 3539                                                           VAL(INTEGER,
- 3540                                                             span))) THEN
- 3541                                                    SemError(222)
- 3542                                                  ELSE QbeGen.SetBit(sq, qe,
- 3543                                                    lo, span)
- 3544                                                 END
- 3545                                               END
- 3546                                             ELSIF (braceCls = SymTab.ClArray)
- 3547                                                OR (braceCls =
- 3548                                                   SymTab.ClRecord)
- 3549                                                OR (braceCls =
- 3550                                                   SymTab.ClClass) THEN
- 3551                                               IF hasR THEN SemError(230) END;
- 3552                                               reps := 1;
- 3553                                               IF hasB THEN
- 3554                                                 IF SymTab.ConstInt(q2, v2)
- 3555   AND (v2 >= 1) THEN
- 3556                                                   reps := v2
- 3557                                                 ELSE SemError(230)
- 3558                                                 END
- 3559                                               END;
- 3560                                               k := 0;
- 3561                                               WHILE k < reps DO
- 3562                                                 QbeGen.CtorElem(qe);
- 3563                                                 INC(k)
- 3564                                               END
- 3565                                             END; .)
- 3566                                          (. AST.SetChild(node,
- 3567                                               AST.NChild(node), astEl); .) .
- 3568    SetElem<st: SymTab.TypeIndex; sq: QbeGen.QVal; node: AST.Node>         (. VAR et, et2: SymTab.TypeIndex;
- 3569                                               qe, q2: QbeGen.QVal;
- 3570                                               v, v2: INTEGER;
- 3571                                               lo: INTEGER;
- 3572                                               span: CARDINAL;
- 3573                                               cl, cl2: INTEGER;
- 3574                                               hasR: BOOLEAN;
- 3575                                               astEl: AST.Node; .)
- 3576      =                                   (. hasR := FALSE; .)
- 3577        Expr<et, qe> (. astEl := astCur; .)
- 3578        [ ".." Expr<et2, q2>              (. astEl := AST.MakeBin(
- 3579                                               AST.NkSubrange, 0, astEl, astCur);
- 3580                                             hasR := TRUE; .) ]
- 3581                                          (. lo := SymTab.SetBaseLo(st);
- 3582                                             span := SymTab.SetCount(st);
- 3583                                             IF (et = SymTab.InvalidType)
- 3584                                                OR (hasR AND (et2 =
- 3585                                                   SymTab.InvalidType)) THEN
- 3586                                             ELSE cl :=
- 3587                                                    SymTab.ClassOf(et);
- 3588                                               IF hasR THEN
- 3589                                                 cl2 :=
- 3590                                                   SymTab.ClassOf(et2)
- 3591                                               ELSE cl2 := SymTab.ClInt
- 3592                                               END;
- 3593                                               IF NOT SymTab.SetElemClassOk(cl)
- 3594                                                  OR (hasR AND NOT
- 3595                                                     SymTab.SetElemClassOk(cl2))
- 3596                                               THEN
- 3597                                                 SemError(222)
- 3598                                               ELSIF hasR
- 3599   AND SymTab.ConstInt(qe, v)
- 3600   AND SymTab.ConstInt(q2,
- 3601                                                     v2)
- 3602   AND ((v < lo)
- 3603                                                     OR (v2 < lo)
- 3604                                                     OR (v >= lo +
- 3605                                                        VAL(INTEGER, span))
- 3606                                                     OR (v2 >= lo +
- 3607                                                        VAL(INTEGER, span))
- 3608                                                     OR (v > v2)) THEN
- 3609                                                 SemError(222)
- 3610                                                ELSIF hasR THEN
- 3611                                                  QbeGen.SetRange(sq, qe, q2,
- 3612                                                    lo, span)
- 3613                                                ELSIF SymTab.ConstInt(qe,
- 3614                                                        v)
- 3615   AND ((v < lo)
- 3616                                                      OR (v >= lo +
- 3617                                                         VAL(INTEGER,
- 3618                                                           span))) THEN
- 3619                                                  SemError(222)
- 3620                                                ELSE QbeGen.SetBit(sq, qe,
- 3621                                                  lo, span)
- 3622                                               END
- 3623                                             END; .)
- 3624                                          (. AST.SetChild(node,
- 3625                                               AST.NChild(node), astEl); .) .
- 3626    GetIdent<VAR n: SymTab.Name>
- 3627      = ident                             (. LexName(n); .) .
- 3628  
- 3629  END M2.
+ 3402                                                 ELSIF (c1 = SymTab.ClInt)
+ 3403    AND (c2 = SymTab.ClReal) THEN
+ 3404                                                   QbeGen.ConvIR(q, qa);
+ 3405                                                   QbeGen.CopyOp(qa, q);
+ 3406                                                   t := vt
+ 3407                                                 ELSIF (c1 = SymTab.ClLong)
+ 3408    AND (c2 = SymTab.ClReal) THEN
+ 3409                                                   QbeGen.ConvLR(q, qa);
+ 3410                                                   QbeGen.CopyOp(qa, q);
+ 3411                                                   t := vt
+ 3412                                                 ELSIF (c1 = SymTab.ClReal)
+ 3413    AND (c2 = SymTab.ClInt) THEN
+ 3414                                                   QbeGen.ConvRI(q, qa);
+ 3415                                                   QbeGen.CopyOp(qa, q);
+ 3416                                                   t := vt
+ 3417                                                 ELSIF (c1 = SymTab.ClReal)
+ 3418    AND (c2 = SymTab.ClLong) THEN
+ 3419                                                   QbeGen.ConvRL(q, qa);
+ 3420                                                   QbeGen.CopyOp(qa, q);
+ 3421                                                   t := vt
+ 3422                                                 ELSIF ((c1 = SymTab.ClInt)
+ 3423                                                     OR (c1 =
+ 3424                                                        SymTab.ClChar)
+ 3425                                                     OR (c1 =
+ 3426                                                        SymTab.ClBool)
+ 3427                                                     OR (c1 =
+ 3428                                                        SymTab.ClEnum))
+ 3429   AND ((c2 = SymTab.ClInt)
+ 3430                                                     OR (c2 =
+ 3431                                                        SymTab.ClChar)
+ 3432                                                     OR (c2 =
+ 3433                                                        SymTab.ClBool)
+ 3434                                                     OR (c2 =
+ 3435                                                        SymTab.ClEnum)) THEN
+ 3436                                                   t := vt
+ 3437                                                 ELSIF (c1 = SymTab.ClPtr)
+ 3438   AND (c2 = SymTab.ClPtr) THEN
+ 3439                                                   t := vt
+ 3440                                                 ELSIF (c1 = SymTab.ClReal)
+ 3441   AND (c2 = SymTab.ClReal) THEN
+ 3442                                                   t := vt
+ 3443                                                 ELSE SemError(230);
+ 3444                                                   t := SymTab.InvalidType
+ 3445                                                 END
+ 3446                                               END
+ 3447                                             END; .)
+ 3448      | "(" Expr<et, q> ")"               (. t := et; astIsLit := TRUE; .)
+ 3449      | SetLit<st, sq>                    (. astIsLit := TRUE; t := st;
+ 3450                                             QbeGen.CopyOp(sq, q); .)
+ 3451      | ( "NOT" | "~" ) Fact<t2, q2>      (. astNot := astCur;
+ 3452                                             IF SymTab.BoolCheck(t2) THEN
+ 3453                                               t := SymTab.BoolType()
+ 3454                                             ELSE SemError(212);
+ 3455                                               t := SymTab.InvalidType END;
+ 3456                                             IF t # SymTab.InvalidType THEN
+ 3457                                               QbeGen.NotQ(q2, q)
+ 3458                                             ELSE QbeGen.CopyOp("0", q)
+ 3459                                             END;
+ 3460                                             astIsLit := TRUE;
+ 3461                                             astCur := AST.MakeUn(
+ 3462                                               AST.NkUnary, AST.OpNot, astNot); .)
+ 3463      )
+ 3464      (. IF NOT astIsLit THEN astCur := AST.NoNode END; .) .
+ 3465    (* Set literals are SET OF [0..255] (8 words); elements validated
+ 3466       0..255 statically when foldable (222 otherwise), runtime trap
+ 3467       for computed elements. Ranges always lower via SetRange. *)
+ 3468    SetLit<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 3469                                          (. VAR astNode: AST.Node; .)
+ 3470      = "{"                               (. t := SymTab.NewSet(
+ 3471                                               SymTab.NewSubR(0, 255));
+ 3472                                             astNode := AST.MakeNode(AST.NkSetLit);
+ 3473                                             QbeGen.NewSetTemp(8, q);
+ 3474                                             QbeGen.SetZero(q, 8); .)
+ 3475        [ SetElem<t, q, astNode> { "," SetElem<t, q, astNode> } ]
+ 3476        "}"                               (. astCur := astNode; .) .
+ 3477    (* Typed brace constructor: TypeName{ elems } — BITSET{0} (a set)
+ 3478       or ArrayName{...} (an array constructor, GNU Modula-2).  The
+ 3479       declared type sets the width (set) or element type (array). *)
+ 3480    TypedBraceLit<vt: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 3481                                          (. VAR nw: CARDINAL;
+ 3482                                               astNode: AST.Node;
+ 3483                                               savedCls: INTEGER; .)
+ 3484      = "{"                               (. savedCls := braceCls;
+ 3485                                             astNode := AST.MakeNode(AST.NkBraceLit);
+ 3486                                             IF vt = SymTab.InvalidType THEN
+ 3487                                               braceCls := -1
+ 3488                                             ELSE braceCls :=
+ 3489                                                    SymTab.ClassOf(vt)
+ 3490                                             END;
+ 3491                                             IF braceCls = SymTab.ClSet THEN
+ 3492                                               IF vt = SymTab.InvalidType THEN
+ 3493                                                 nw := 8
+ 3494                                               ELSE nw := SymTab.SetWords(vt);
+ 3495                                                 IF nw = 0 THEN nw := 8 END
+ 3496                                               END;
+ 3497                                               QbeGen.NewSetTemp(nw, q);
+ 3498                                               QbeGen.SetZero(q, nw)
+ 3499                                             ELSIF (braceCls =
+ 3500                                                    SymTab.ClArray)
+ 3501                                                OR (braceCls =
+ 3502                                                    SymTab.ClRecord)
+ 3503                                                OR (braceCls =
+ 3504                                                    SymTab.ClClass) THEN
+ 3505                                               QbeGen.CtorBegin(vt)
+ 3506                                             ELSE
+ 3507                                               IF vt # SymTab.InvalidType THEN
+ 3508                                                 SemError(230) END;
+ 3509                                               braceCls := -1
+ 3510                                             END; .)
+ 3511        [ BraceElem<vt, q, astNode> { "," BraceElem<vt, q, astNode> } ]
+ 3512        "}"                               (. IF (braceCls = SymTab.ClArray)
+ 3513                                                OR (braceCls =
+ 3514                                                   SymTab.ClRecord)
+ 3515                                                OR (braceCls =
+ 3516                                                   SymTab.ClClass) THEN
+ 3517                                               QbeGen.CtorEnd(q)
+ 3518                                             ELSIF braceCls # SymTab.ClSet THEN
+ 3519                                               QbeGen.CopyOp("0", q)
+ 3520                                             END;
+ 3521                                             braceCls := savedCls; .)
+ 3522                                          (. astCur := astNode; .) .
+ 3523    BraceElem<vt: SymTab.TypeIndex; VAR sq: QbeGen.QVal; node: AST.Node>
+ 3524                                          (. VAR et, et2: SymTab.TypeIndex;
+ 3525                                               qe, q2: QbeGen.QVal;
+ 3526                                               v, v2, reps, k: INTEGER;
+ 3527                                               elem: SymTab.TypeIndex;
+ 3528                                               lo: INTEGER;
+ 3529                                               span: CARDINAL;
+ 3530                                               cl, cl2: INTEGER;
+ 3531                                               hasR, hasB: BOOLEAN;
+ 3532                                               astEl: AST.Node; .)
+ 3533      =                                   (. hasR := FALSE; hasB := FALSE; .)
+ 3534        Expr<et, qe> (. astEl := astCur; .)
+ 3535        [ ".." Expr<et2, q2>              (. astEl := AST.MakeBin(
+ 3536                                               AST.NkSubrange, 0, astEl, astCur);
+ 3537                                             hasR := TRUE; .) ]
+ 3538        [ "BY" Expr<et2, q2>              (. hasB := TRUE; .) ]
+ 3539                                          (. IF braceCls = SymTab.ClSet THEN
+ 3540                                               IF hasB THEN SemError(230) END;
+ 3541                                               lo := SymTab.SetBaseLo(vt);
+ 3542                                               span := SymTab.SetCount(vt);
+ 3543                                               IF (et = SymTab.InvalidType)
+ 3544                                                  OR (hasR AND (et2 =
+ 3545                                                     SymTab.InvalidType)) THEN
+ 3546                                               ELSE cl :=
+ 3547                                                      SymTab.ClassOf(et);
+ 3548                                                 IF hasR THEN
+ 3549                                                   cl2 :=
+ 3550                                                     SymTab.ClassOf(et2)
+ 3551                                                 ELSE cl2 := SymTab.ClInt
+ 3552                                                 END;
+ 3553                                                 IF NOT SymTab.SetElemClassOk(cl)
+ 3554                                                    OR (hasR AND NOT
+ 3555                                                       SymTab.SetElemClassOk(cl2))
+ 3556                                                 THEN
+ 3557                                                   SemError(222)
+ 3558                                                 ELSIF hasR
+ 3559   AND SymTab.ConstInt(qe, v)
+ 3560   AND SymTab.ConstInt(q2,
+ 3561                                                       v2)
+ 3562   AND ((v < lo)
+ 3563                                                       OR (v2 < lo)
+ 3564                                                       OR (v >= lo +
+ 3565                                                          VAL(INTEGER, span))
+ 3566                                                       OR (v2 >= lo +
+ 3567                                                          VAL(INTEGER, span))
+ 3568                                                       OR (v > v2)) THEN
+ 3569                                                   SemError(222)
+ 3570                                                  ELSIF hasR THEN
+ 3571                                                    QbeGen.SetRange(sq, qe, q2,
+ 3572                                                      lo, span)
+ 3573                                                  ELSIF SymTab.ConstInt(qe,
+ 3574                                                          v)
+ 3575   AND ((v < lo)
+ 3576                                                        OR (v >= lo +
+ 3577                                                           VAL(INTEGER,
+ 3578                                                             span))) THEN
+ 3579                                                    SemError(222)
+ 3580                                                  ELSE QbeGen.SetBit(sq, qe,
+ 3581                                                    lo, span)
+ 3582                                                 END
+ 3583                                               END
+ 3584                                             ELSIF (braceCls = SymTab.ClArray)
+ 3585                                                OR (braceCls =
+ 3586                                                   SymTab.ClRecord)
+ 3587                                                OR (braceCls =
+ 3588                                                   SymTab.ClClass) THEN
+ 3589                                               IF hasR THEN SemError(230) END;
+ 3590                                               reps := 1;
+ 3591                                               IF hasB THEN
+ 3592                                                 IF SymTab.ConstInt(q2, v2)
+ 3593   AND (v2 >= 1) THEN
+ 3594                                                   reps := v2
+ 3595                                                 ELSE SemError(230)
+ 3596                                                 END
+ 3597                                               END;
+ 3598                                               k := 0;
+ 3599                                               WHILE k < reps DO
+ 3600                                                 QbeGen.CtorElem(qe);
+ 3601                                                 INC(k)
+ 3602                                               END
+ 3603                                             END; .)
+ 3604                                          (. AST.SetChild(node,
+ 3605                                               AST.NChild(node), astEl); .) .
+ 3606    SetElem<st: SymTab.TypeIndex; sq: QbeGen.QVal; node: AST.Node>         (. VAR et, et2: SymTab.TypeIndex;
+ 3607                                               qe, q2: QbeGen.QVal;
+ 3608                                               v, v2: INTEGER;
+ 3609                                               lo: INTEGER;
+ 3610                                               span: CARDINAL;
+ 3611                                               cl, cl2: INTEGER;
+ 3612                                               hasR: BOOLEAN;
+ 3613                                               astEl: AST.Node; .)
+ 3614      =                                   (. hasR := FALSE; .)
+ 3615        Expr<et, qe> (. astEl := astCur; .)
+ 3616        [ ".." Expr<et2, q2>              (. astEl := AST.MakeBin(
+ 3617                                               AST.NkSubrange, 0, astEl, astCur);
+ 3618                                             hasR := TRUE; .) ]
+ 3619                                          (. lo := SymTab.SetBaseLo(st);
+ 3620                                             span := SymTab.SetCount(st);
+ 3621                                             IF (et = SymTab.InvalidType)
+ 3622                                                OR (hasR AND (et2 =
+ 3623                                                   SymTab.InvalidType)) THEN
+ 3624                                             ELSE cl :=
+ 3625                                                    SymTab.ClassOf(et);
+ 3626                                               IF hasR THEN
+ 3627                                                 cl2 :=
+ 3628                                                   SymTab.ClassOf(et2)
+ 3629                                               ELSE cl2 := SymTab.ClInt
+ 3630                                               END;
+ 3631                                               IF NOT SymTab.SetElemClassOk(cl)
+ 3632                                                  OR (hasR AND NOT
+ 3633                                                     SymTab.SetElemClassOk(cl2))
+ 3634                                               THEN
+ 3635                                                 SemError(222)
+ 3636                                               ELSIF hasR
+ 3637   AND SymTab.ConstInt(qe, v)
+ 3638   AND SymTab.ConstInt(q2,
+ 3639                                                     v2)
+ 3640   AND ((v < lo)
+ 3641                                                     OR (v2 < lo)
+ 3642                                                     OR (v >= lo +
+ 3643                                                        VAL(INTEGER, span))
+ 3644                                                     OR (v2 >= lo +
+ 3645                                                        VAL(INTEGER, span))
+ 3646                                                     OR (v > v2)) THEN
+ 3647                                                 SemError(222)
+ 3648                                                ELSIF hasR THEN
+ 3649                                                  QbeGen.SetRange(sq, qe, q2,
+ 3650                                                    lo, span)
+ 3651                                                ELSIF SymTab.ConstInt(qe,
+ 3652                                                        v)
+ 3653   AND ((v < lo)
+ 3654                                                      OR (v >= lo +
+ 3655                                                         VAL(INTEGER,
+ 3656                                                           span))) THEN
+ 3657                                                  SemError(222)
+ 3658                                                ELSE QbeGen.SetBit(sq, qe,
+ 3659                                                  lo, span)
+ 3660                                               END
+ 3661                                             END; .)
+ 3662                                          (. AST.SetChild(node,
+ 3663                                               AST.NChild(node), astEl); .) .
+ 3664    GetIdent<VAR n: SymTab.Name>
+ 3665      = ident                             (. LexName(n); .) .
+ 3666  
+ 3667  END M2.
 
     0 errors
 

docs/plan-two-phase.md

@@ -92,10 +92,11 @@ Suggested slices, each ending in `build.sh` + `run_tests.sh` +
    `NkConstDecl`/`NkTypeDecl`/`NkVarDecl`/`NkProcDecl` (types referenced
    by the node `ty` index); `astUnit` holds `NkUnit(name, decls, body)`
    for all three unit kinds; builtin statements build `NkCall`s.
-   Deferred: imports, `CLASS`, nested modules in the unit AST;
-   `ResultComp`; `Lower`.  Also `docs/summary_two-phase-slice8.md`
-   (`CASE`/`WITH`) and `docs/summary_two-phase-slice9.md` (brace/set
-   literals).
+   Deferred: imports, `CLASS`, nested modules in the unit AST; `Lower`.
+   Also `docs/summary_two-phase-slice8.md` (`CASE`/`WITH`),
+   `docs/summary_two-phase-slice9.md` (brace/set literals) and
+   `docs/summary_two-phase-slice10.md` (`ResultComp` + unbounded
+   `NkBlock`/`NkDeclSeq`).
 5. **Flip**: bodies lower from the AST; delete `FwdPatchAll` /
    `FixLoadClass` / `FixStoreClass`, the `Design` forward-variable
    placeholder, and `pendVar*` if superseded.

docs/summary_two-phase-slice10.md

@@ -0,0 +1,45 @@
+# Two-phase refactor — slice 10 (ResultComp + unbounded sequences)
+
+Branch `ast-stage-c`.  Suite **178/178**; self-hosting fixpoint **OK**
+(**3,027,925 bytes**; slice 9 was 3,024,098).
+
+## What landed
+
+### Call-result suffixes (`ResultComp`)
+
+`F()[i]`, `F().f`, `F()^` now wrap the call in an `NkDesignator` with
+`NkSelector` children (`SelIndex`/`SelField`/`SelDeref`), exactly like
+`Design`.  `Fact` builds the `NkCall` right after `ArgList` into a local
+`astRes` and passes it **by reference** to `ResultComp`, which wraps it
+on the first suffix and appends each selector.
+
+### Unbounded block / decl sequences
+
+Found while dumping `t_resultsfx.mod`: `NkBlock`/`NkDeclSeq` were capped
+at `AST.MaxChild` (8) children, so a body with more than 7 statements
+**silently dropped** the rest.  Fixed with a chunked sequence:
+
+- a new module-level `AstAppend(kind, VAR head, tail, item)` appends up
+  to `MaxChild-1` items per node and chains the overflow through
+  `child[MaxChild-1]` into a fresh node of the same kind;
+- `StatSeq`, `DeclSeq`, `ConstBlock`, `VarBlock` now use it.
+
+Sequences are therefore unbounded; a walk reads children `0..MaxChild-2`
+then follows `child[MaxChild-1]`.
+
+## Verified (temporary `AST.Dump`, then removed)
+
+- `GetRec()^.a` → `NkDesignator(NkCall(GetRec), SelDeref, SelField a)`.
+- A body with 12 assignments produced **12** `NkAssign` nodes across
+  **2** `NkBlock` chunks (7 + 5) — nothing dropped.
+
+## Deliberately deferred
+
+- Imports, `CLASS`, nested modules in the unit AST.
+- `Lower` + `.ssa` byte-compare.
+- The same `MaxChild` cap still applies to `CASE` arms, `WITH`
+  designators and call actuals — worth the chunked treatment later.
+
+## Next
+
+Imports / `CLASS` / nested modules, then `Lower`.