String: drop the pervasive predef; report unresolved forward types

String is not a gm2 built-in — it is an opaque type imported from a
definition module (DynamicStrings, or a local opaque).  So:

- remove Predef("String", ...): an unimported String is now
  'undeclared identifier' (gm2 conformance), and the opaque-pointer
  behaviour is what makes imported opaque Strings work;
- forward type references are now verified at module end: a
  module-level type name that is never declared reports 201
  (SymTab.FwdPending/FwdInfo/FwdClear; inline checks in ProgModule and
  ImplUnit after FlushPend).
- t_string.mod becomes the gm2-shaped test: an opaque String declared
  in d_string.def, completed in d_string.mod, imported by the program.
- docs corrected: String is not pervasive/magic.

Suite 169/169; fixpoint OK (2,754,353 bytes).  Corpus (conformant
rejections): testsuite 395 -> 392, stdlib 131 -> 127.

compiler/run_tests.sh

@@ -75,7 +75,6 @@ expect_run t_setops.mod 42
 expect_run t_fwdtype.mod 42
 expect_run t_libc.mod 42
 expect_run t_variant2.mod 42
-expect_run t_string.mod 42
 expect_run t_addrptr.mod 42
 expect_run t_nestedmod.mod 42
 expect_run t_nestidx.mod 42
@@ -251,6 +250,7 @@ expect_run_files TClassDefProg 8 t_classdef.def t_classdef_prog.mod
 expect_run_files DQualProg 46 d_basic.def d_basic.mod d_qual_prog.mod
 expect_run_files DTypesProg 36 d_types.def d_types.mod d_types_prog.mod
 expect_run_files DOpaqueProg 55 d_opaque.def d_opaque.mod d_opaque_prog.mod
+expect_run_files TString 42 d_string.def d_string.mod t_string.mod
 expect_run_files FioProg 42 ../runtime/syslib/SysShim.def ../runtime/syslib/SysShim.mod ../runtime/syslib/FileIO.def ../runtime/syslib/FileIO.mod fio_prog.mod
 expect_run_files StorageProg 42 ../stdlib/storage.def ../stdlib/storage.mod storage_prog.mod
 expect_run_files ClashProg 60 d_clash_a.def d_clash_a.mod d_clash_b.def d_clash_b.mod d_clash_prog.mod

compiler/src/M2.atg

@@ -141,7 +141,9 @@ PRODUCTIONS
                                              SemError(202) END;
                                            SymTab.EndUnit; .) .
   ImplUnit                              (. VAR m1, m2: SymTab.Name;
-                                             k: CARDINAL; .)
+                                             k: CARDINAL;
+                                             fname: SymTab.Name;
+                                             unres: BOOLEAN; .)
     = "IMPLEMENTATION" "MODULE"
       GetIdent<m1>                      (. IF NOT SymTab.BeginImpl(m1) THEN
                                              SemError(201) END;
@@ -151,15 +153,31 @@ PRODUCTIONS
       { Import }
       DeclSeq
       [ "BEGIN"                         (. FlushPend;
+                                           k := 0;
+                                           WHILE k < SymTab.FwdPending() DO
+                                             SymTab.FwdInfo(k, fname, unres);
+                                             IF unres THEN SemError(201) END;
+                                             INC(k)
+                                           END;
+                                           SymTab.FwdClear;
                                            QbeGen.BeginInit(m1); .)
         [ StatSeq ]                       (. QbeGen.EndInit; .) ]
       "END"
       GetIdent<m2>                      (. FlushPend;
+                                           k := 0;
+                                           WHILE k < SymTab.FwdPending() DO
+                                             SymTab.FwdInfo(k, fname, unres);
+                                             IF unres THEN SemError(201) END;
+                                             INC(k)
+                                           END;
+                                           SymTab.FwdClear;
                                            IF NOT SymTab.Equal(m1, m2) THEN
                                              SemError(202) END;
                                            SymTab.EndUnit; .) .
   ProgModule                            (. VAR m1, m2: SymTab.Name;
-                                             k: CARDINAL; .)
+                                             k: CARDINAL;
+                                             fname: SymTab.Name;
+                                             unres: BOOLEAN; .)
     = "MODULE"
       GetIdent<m1>                      (. IF NOT SymTab.BeginProg(m1) THEN
                                              SemError(200) END;
@@ -170,10 +188,24 @@ PRODUCTIONS
       { Import }
       DeclSeq
       [ "BEGIN"                         (. FlushPend;
+                                           k := 0;
+                                           WHILE k < SymTab.FwdPending() DO
+                                             SymTab.FwdInfo(k, fname, unres);
+                                             IF unres THEN SemError(201) END;
+                                             INC(k)
+                                           END;
+                                           SymTab.FwdClear;
                                            QbeGen.BeginBody; .)
         [ StatSeq ] ]
       "END"
       GetIdent<m2>                      (. FlushPend;
+                                           k := 0;
+                                           WHILE k < SymTab.FwdPending() DO
+                                             SymTab.FwdInfo(k, fname, unres);
+                                             IF unres THEN SemError(201) END;
+                                             INC(k)
+                                           END;
+                                           SymTab.FwdClear;
                                            IF NOT SymTab.Equal(m1, m2) THEN
                                              SemError(202) END;
                                            QbeGen.EndModule(m1);

compiler/src/M2.lst

@@ -159,2843 +159,2875 @@ Listing:
   141                                               SemError(202) END;
   142                                             SymTab.EndUnit; .) .
   143    ImplUnit                              (. VAR m1, m2: SymTab.Name;
-  144                                               k: CARDINAL; .)
-  145      = "IMPLEMENTATION" "MODULE"
-  146        GetIdent<m1>                      (. IF NOT SymTab.BeginImpl(m1) THEN
-  147                                               SemError(201) END;
-  148                                             nPendVar := 0;
-  149                                             QbeGen.SetModule(m1); .)
-  150        ";"
-  151        { Import }
-  152        DeclSeq
-  153        [ "BEGIN"                         (. FlushPend;
-  154                                             QbeGen.BeginInit(m1); .)
-  155          [ StatSeq ]                       (. QbeGen.EndInit; .) ]
-  156        "END"
-  157        GetIdent<m2>                      (. FlushPend;
-  158                                             IF NOT SymTab.Equal(m1, m2) THEN
-  159                                               SemError(202) END;
-  160                                             SymTab.EndUnit; .) .
-  161    ProgModule                            (. VAR m1, m2: SymTab.Name;
-  162                                               k: CARDINAL; .)
-  163      = "MODULE"
-  164        GetIdent<m1>                      (. IF NOT SymTab.BeginProg(m1) THEN
-  165                                               SemError(200) END;
-  166                                             nPendVar := 0;
-  167                                             QbeGen.SetModule(m1); .)
-  168        [ Priority ]
-  169        ";"
-  170        { Import }
-  171        DeclSeq
-  172        [ "BEGIN"                         (. FlushPend;
-  173                                             QbeGen.BeginBody; .)
-  174          [ StatSeq ] ]
-  175        "END"
-  176        GetIdent<m2>                      (. FlushPend;
-  177                                             IF NOT SymTab.Equal(m1, m2) THEN
-  178                                               SemError(202) END;
-  179                                             QbeGen.EndModule(m1);
-  180                                             SymTab.EndUnit; .) .
-  181    DeclSeq
-  182      = { ConstBlock | TypeBlock<FALSE> | VarBlock | ProcDecl ";"
-  183        | NestedModule ";" | ClassItem ";" } .
-  184    (* Local module, Wirth form. Declarations lower like top-level ones
-  185       (same QBE module prefix); a BEGIN body becomes an init function
-  186       that main calls; the EXPORT list is hoisted into the enclosing
-  187       scope at END. *)
-  188    NestedModule                          (. VAR m1, m2: SymTab.Name;
-  189                                               expNames: ARRAY [0 .. 63] OF SymTab.Name;
-  190                                               expCount, k: CARDINAL; .)
-  191      = "MODULE"
-  192        GetIdent<m1>                      (. IF NOT SymTab.Enter(m1,
-  193                                               SymTab.KindModule) THEN
-  194                                               SemError(200) END;
-  195                                             SymTab.PushScope;
-  196                                             expCount := 0; .)
-  197        [ Priority ]
-  198        ";"
-  199        { Import }
-  200        [ "EXPORT" [ "QUALIFIED" ]
-  201          GetIdent<expNames[expCount]>    (. INC(expCount); .)
-  202          { "," GetIdent<expNames[expCount]>
-  203                                          (. INC(expCount); .) }
-  204          ";" ]
-  205        DeclSeq
-  206        [ "BEGIN"                         (. QbeGen.BeginInit(m1); .)
-  207          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
-  208        "END"
-  209        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
+  144                                               k: CARDINAL;
+  145                                               fname: SymTab.Name;
+  146                                               unres: BOOLEAN; .)
+  147      = "IMPLEMENTATION" "MODULE"
+  148        GetIdent<m1>                      (. IF NOT SymTab.BeginImpl(m1) THEN
+  149                                               SemError(201) END;
+  150                                             nPendVar := 0;
+  151                                             QbeGen.SetModule(m1); .)
+  152        ";"
+  153        { Import }
+  154        DeclSeq
+  155        [ "BEGIN"                         (. FlushPend;
+  156                                             k := 0;
+  157                                             WHILE k < SymTab.FwdPending() DO
+  158                                               SymTab.FwdInfo(k, fname, unres);
+  159                                               IF unres THEN SemError(201) END;
+  160                                               INC(k)
+  161                                             END;
+  162                                             SymTab.FwdClear;
+  163                                             QbeGen.BeginInit(m1); .)
+  164          [ StatSeq ]                       (. QbeGen.EndInit; .) ]
+  165        "END"
+  166        GetIdent<m2>                      (. FlushPend;
+  167                                             k := 0;
+  168                                             WHILE k < SymTab.FwdPending() DO
+  169                                               SymTab.FwdInfo(k, fname, unres);
+  170                                               IF unres THEN SemError(201) END;
+  171                                               INC(k)
+  172                                             END;
+  173                                             SymTab.FwdClear;
+  174                                             IF NOT SymTab.Equal(m1, m2) THEN
+  175                                               SemError(202) END;
+  176                                             SymTab.EndUnit; .) .
+  177    ProgModule                            (. VAR m1, m2: SymTab.Name;
+  178                                               k: CARDINAL;
+  179                                               fname: SymTab.Name;
+  180                                               unres: BOOLEAN; .)
+  181      = "MODULE"
+  182        GetIdent<m1>                      (. IF NOT SymTab.BeginProg(m1) THEN
+  183                                               SemError(200) END;
+  184                                             nPendVar := 0;
+  185                                             QbeGen.SetModule(m1); .)
+  186        [ Priority ]
+  187        ";"
+  188        { Import }
+  189        DeclSeq
+  190        [ "BEGIN"                         (. FlushPend;
+  191                                             k := 0;
+  192                                             WHILE k < SymTab.FwdPending() DO
+  193                                               SymTab.FwdInfo(k, fname, unres);
+  194                                               IF unres THEN SemError(201) END;
+  195                                               INC(k)
+  196                                             END;
+  197                                             SymTab.FwdClear;
+  198                                             QbeGen.BeginBody; .)
+  199          [ StatSeq ] ]
+  200        "END"
+  201        GetIdent<m2>                      (. FlushPend;
+  202                                             k := 0;
+  203                                             WHILE k < SymTab.FwdPending() DO
+  204                                               SymTab.FwdInfo(k, fname, unres);
+  205                                               IF unres THEN SemError(201) END;
+  206                                               INC(k)
+  207                                             END;
+  208                                             SymTab.FwdClear;
+  209                                             IF NOT SymTab.Equal(m1, m2) THEN
   210                                               SemError(202) END;
-  211                                             k := 0;
-  212                                             WHILE k < expCount DO
-  213                                               SymTab.ExportUp(expNames[k]);
-  214                                               INC(k)
-  215                                             END;
-  216                                             SymTab.PopScope; .) .
-  217    Priority
-  218      = "[" integer "]"                   (. SemError(230); .) .
-  219    (* Imports (4.3): FROM materializes the names (unqualified use);
-  220       plain IMPORT only demands the module exists — qualified `L.x`
-  221       materializes on first use (Design). *)
-  222    (* Unknown modules stay unchecked stubs (legacy, so hand-written
-  223       import lines don't fail); a known module's missing export is
-  224       201. *)
-  225    Import                                (. VAR n: SymTab.Name; .)
-  226      = "FROM"
-  227        GetIdent<n>
-  228        "IMPORT"
-  229        ImpList<n> ";"
-  230      | "IMPORT"
-  231        ImpModList ";" .
-  232    ImpList<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
-  233      = ImpName<mod>
-  234        { "," ImpName<mod> } .
-  235    (* Pervasive built-ins imported from SYSTEM (e.g. TSIZE) are
-  236       accepted and ignored: the built-in applies regardless. *)
-  237    ImpName<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
-  238      = GetIdent<n>                       (. IF SymTab.Equal(mod, "libc") THEN
-  239                                               (* intrinsic C library:
-  240                                                  permissive external *)
-  241                                               IF NOT SymTab.DeclareCProc(n) THEN
-  242                                                 SemError(201) END
-  243                                             ELSIF SymTab.ModKnown(mod)
-  244                                               AND NOT SymTab.ImportFrom(mod, n) THEN
-  245                                               SemError(201) END; .)
-  246      | ( "TSIZE" | "SIZE" | "ADR" | "HIGH" | "LEN"
-  247        | "CHR" | "ORD" | "ORDL" | "VAL" | "ABS" | "CAP"
-  248        | "UCHR" | "CHR8" | "UORD"
-  249        | "INC" | "DEC" ) .
-  250    ImpModList                            (. VAR n: SymTab.Name; .)
-  251      = GetIdent<n>
-  252        { "," GetIdent<n> } .
-  253    (* Opaque TYPE declarations (definition modules). The targetless
-  254       alias resolves to InvalidType until step 4 completes it. *)
-  255    (* Scalar-phase TYPEs: named types, integer subranges, enumerations.
-  256       Opaque "TYPE T;" needs isDef (definition units); elsewhere 231.
-  257       Composite forms (ARRAY/RECORD/SET/POINTER) arrive with step 3. *)
-  258    TypeBlock<isDef: BOOLEAN>
-  259      = "TYPE"                            (. SymTab.BeginTypeBlock; .)
-  260        { TypeItem<isDef> ";" | ClassItem ";" }
-  261                                          (. SymTab.EndTypeBlock; .) .
-  262    TypeItem<isDef: BOOLEAN>              (. VAR n: SymTab.Name;
-  263                                               t, op: SymTab.TypeIndex; .)
-  264      = GetIdent<n>                       (. op := SymTab.OpaqueBase(n);
-  265                                             IF op = SymTab.InvalidType THEN
-  266                                               IF NOT SymTab.Enter(n,
-  267                                                  SymTab.KindType) THEN
-  268                                                 SemError(200) END
-  269                                             END; .)
-  270        ( "=" Type<t, FALSE>              (. IF op # SymTab.InvalidType THEN
-  271                                               SymTab.SetTarget(op, t)
-  272                                             ELSE SymTab.SetSymType(n, t)
-  273                                             END; .)
-  274        |                                 (. IF op # SymTab.InvalidType THEN
-  275                                               (* stays opaque *)
-  276                                             ELSIF NOT isDef THEN
-  277                                               SemError(231)
-  278                                             ELSE SymTab.SetSymType(n,
-  279                                               SymTab.NewAlias()) END; .) ) .
-  280    Type<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
-  281      = TypeIdent<t> [ Subrange<t> ]     (* anchored subrange: T[lo..hi] *)
-  282      | Subrange<t>
-  283      | Enum<t>
-  284      | ArrayType<t, allowOpen>
-  285      | SetType<t>
-  286      | RecordType<t>
-  287      | PointerType<t>
-  288      | ProcType<t> .
-  289    PointerType<VAR t: SymTab.TypeIndex>  (. VAR base: SymTab.TypeIndex; .)
-  290      = "POINTER" "TO" Type<base, FALSE>(. t := SymTab.NewPtr(base); .) .
-  291    (* Procedure types (step 8.5): PROCEDURE (params): result. Values
-  292       are code pointers; params are collected into the descriptor. *)
-  293    ProcType<VAR t: SymTab.TypeIndex>     (. VAR res, pt: SymTab.TypeIndex;
-  294                                               isV: BOOLEAN; .)
-  295      = "PROCEDURE"                       (. res := SymTab.InvalidType;
-  296                                             t := SymTab.NewProcType(res); .)
-  297        [ "(" [ ProcTypeSection<t> { ";" ProcTypeSection<t> } ] ")" ]
-  298        [ ":" TypeIdent<res>              (. SymTab.SetProcTypeRes(t, res); .) ] .
-  299    ProcTypeSection<t: SymTab.TypeIndex>  (. VAR pt: SymTab.TypeIndex;
-  300                                               isV: BOOLEAN;
-  301                                               cnt, k: CARDINAL;
-  302                                               names: ARRAY [0 .. 15] OF SymTab.Name; .)
-  303      =                                   (. isV := FALSE; cnt := 0; .)
-  304        [ "VAR"                           (. isV := TRUE; .) ]
-  305        ( GetIdent<names[cnt]>            (. INC(cnt); .)
-  306          { "," GetIdent<names[cnt]>      (. INC(cnt); .) }
-  307          ( ":" Type<pt, TRUE>           (. k := 0;
-  308                                             WHILE k < cnt DO
-  309                                               SymTab.ProcTypeAdd(t, isV, pt);
-  310                                               INC(k)
-  311                                             END; .)
-  312          |                               (. (* type-only parameter list:
-  313                                                each name is a type (GNU
-  314                                                shorthand used by the
-  315                                                Coco/R scanner frame) *)
-  316                                             k := 0;
-  317                                             WHILE k < cnt DO
-  318                                               IF SymTab.Lookup(names[k])
-  319                                                  AND ((SymTab.SymKind(names[k]) = SymTab.KindType)
-  320    OR (SymTab.SymKind(names[k]) = SymTab.KindPredef)) THEN
-  321                                                 pt := SymTab.SymType(names[k])
-  322                                               ELSE SemError(201);
-  323                                                 pt := SymTab.InvalidType
-  324                                               END;
-  325                                               SymTab.ProcTypeAdd(t, isV, pt);
-  326                                               INC(k)
-  327                                             END; .) )
-  328        | Type<pt, TRUE>                 (. (* unnamed parameter (PIM):
-  329                                                e.g. PROCEDURE (VAR ARRAY OF REAL) *)
-  330                                             SymTab.ProcTypeAdd(t, isV, pt); .) ) .
-  331    (* Arrays: "OF" without bounds is an open formal (allowed only
-  332       where allowOpen); "[lo..hi, ...]" nests bounded levels inside
-  333       out. Bounds are folded literals (int/char); anything else 230.
-  334       Bare-type indices ("ARRAY Color OF") wait for enum ordinals. *)
-  335    ArrayType<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
-  336                                          (. VAR elem: SymTab.TypeIndex;
-  337                                               ok: BOOLEAN;
-  338                                               bnds, bndh: ARRAY [0 .. 7] OF INTEGER;
-  339                                               nb, k: CARDINAL;
-  340                                               idx: SymTab.TypeIndex;
-  341                                               ilo, ihi: INTEGER; .)
-  342      = "ARRAY"
-  343        ( "OF" Type<elem, FALSE>          (. IF NOT allowOpen THEN
-  344                                               SemError(230) END;
-  345                                             t := SymTab.NewOpenArray(elem); .)
-  346        | TypeIdent<idx> [ Subrange<idx> ]
-  347          "OF" Type<elem, FALSE>          (. (* index-type array: the index
-  348                                                type's ordinal bounds give the
-  349                                                [lo..hi] pair *)
-  350                                             IF SymTab.TypeBounds(idx, ilo,
-  351                                                ihi)
-  352                                             THEN t := SymTab.NewArrayB(elem,
-  353                                                    ilo, ihi)
-  354                                             ELSE SemError(230);
-  355                                               t := SymTab.InvalidType
-  356                                             END; .)
-  357        | "["                             (. SymTab.BoundBegin; ok := TRUE; .)
-  358          BoundPair<ok>
-  359          { "," BoundPair<ok> }
-  360          "]"                             (. (* snapshot before the element
-  361                                                type, which reuses the bound
-  362                                                buffer for a nested ARRAY *)
-  363                                             nb := SymTab.BoundCount();
-  364                                             k := 0;
-  365                                             WHILE k < nb DO
-  366                                               bnds[k] := SymTab.BoundLo(k);
-  367                                               bndh[k] := SymTab.BoundHi(k);
-  368                                               INC(k)
-  369                                             END; .)
-  370          "OF" Type<elem, FALSE>
-  371                                          (. IF ok THEN
-  372                                               k := nb;
-  373                                               WHILE k > 0 DO
-  374                                                 DEC(k);
-  375                                                 elem := SymTab.NewArrayB(
-  376                                                   elem, bnds[k], bndh[k])
-  377                                               END;
-  378                                               t := elem
-  379                                             ELSE t := SymTab.InvalidType
-  380                                             END; .) ) .
-  381    BoundPair<VAR ok: BOOLEAN>            (. VAR tlo, thi: SymTab.TypeIndex;
-  382                                               qlo, qhi: QbeGen.QVal;
-  383                                               lo, hi: INTEGER;
-  384                                               cl, cl2: INTEGER; .)
-  385      = Expr<tlo, qlo> ".." Expr<thi, qhi>
-  386                                          (. IF (tlo = SymTab.InvalidType)
-  387                                              OR (thi = SymTab.InvalidType) THEN
-  388                                             ok := FALSE
-  389                                           ELSE cl := SymTab.ClassOf(tlo);
-  390                                             cl2 := SymTab.ClassOf(thi);
-  391                                             IF ((cl # SymTab.ClInt)
-  392   AND (cl # SymTab.ClChar))
-  393                                                OR ((cl2 # SymTab.ClInt)
-  394   AND (cl2 # SymTab.ClChar)) THEN
-  395                                               SemError(230); ok := FALSE
-  396                                             ELSIF NOT SymTab.ConstInt(qlo, lo)
-  397                                                OR NOT SymTab.ConstInt(qhi, hi)
-  398                                                OR (lo > hi) THEN
-  399                                               SemError(230); ok := FALSE
-  400                                              ELSIF NOT SymTab.BoundAdd(lo, hi) THEN
-  401                                                SemError(230); ok := FALSE
-  402                                              END;
-  403                                            END; .) .
-  404    (* Sets: multi-word masks over bases ≤ 256 values (bool, char,
-  405       bounded subranges; enums wait for ordinals, INTEGER is
-  406       unbounded). Literals are SET OF [0..255]; assignment and
-  407       comparison across suitable bases are lenient (masks over min
-  408       words + zero-check extras), out-of-span literals are 222. *)
-  409    SetType<VAR t: SymTab.TypeIndex>      (. VAR base: SymTab.TypeIndex;
-  410                                               blo, bhi, bspan: INTEGER;
-  411                                               bcls: INTEGER; .)
-  412      = "SET" "OF" Type<base, FALSE>
-  413                                          (. IF base = SymTab.InvalidType THEN
-  414                                               t := SymTab.InvalidType
-  415                                             ELSE bcls :=
-  416                                                    SymTab.ClassOf(base);
-  417                                               IF bcls = SymTab.ClBool THEN
-  418                                                 blo := 0; bspan := 2
-  419                                               ELSIF bcls = SymTab.ClChar THEN
-  420                                                 blo := 0; bspan := 256
-  421                                               ELSIF bcls = SymTab.ClEnum THEN
-  422                                                 blo := 0;
-  423                                                 bspan := VAL(INTEGER,
-  424                                                   SymTab.EnumCount(base))
-  425                                               ELSIF SymTab.SubBounds(base,
-  426                                                       blo, bhi) THEN
-  427                                                 bspan := bhi - blo + 1
-  428                                               ELSE bspan := 0 END;
-  429                                               IF (bspan <= 0)
-  430                                                  OR (bspan > 65536) THEN
-  431                                                 SemError(230);
-  432                                                 t := SymTab.InvalidType
-  433                                               ELSE t := SymTab.NewSet(base)
-  434                                               END
-  435                                             END; .) .
-  436    (* Records: flat blobs; array fields are pointers to static
-  437       descriptors (locked amendment), nested records inline. Field
-  438       offsets static and declaration-ordered. *)
-  439    (* Field list: plain fields and (optionally) one variant part.  The
-  440       variant part is a `CASE ... END` item; because it starts with the
-  441       CASE keyword it is unambiguously distinguishable from a field
-  442       (which starts with an identifier). *)
-  443    RecordType<VAR t: SymTab.TypeIndex>   (. VAR t2: SymTab.TypeIndex;
-  444                                               tagOk: BOOLEAN; .)
-  445      = "RECORD"                          (. t := SymTab.NewRecord(); .)
-  446        [ RecItem<t> { ";" [ RecItem<t> ] } ]
-  447        "END" .
-  448    RecItem<rec: SymTab.TypeIndex>        (. VAR tt: SymTab.TypeIndex; .)
-  449      = RecField<rec>
-  450      | CaseField<rec>                    (. SymTab.MarkVariant(rec); .) .
-  451    (* A variant part: CASE tag : Type OF variants.  The layout overlays
-  452       every branch from the tag slot (see SymTab.ComputeOffsets). *)
-  453    CaseField<rec: SymTab.TypeIndex>      (. VAR tagT: SymTab.TypeIndex;
-  454                                               tagN: SymTab.Name; .)
-  455      = "CASE"                            (. SymTab.ResetFields(rec); .)
-  456        GetIdent<tagN>                    (. IF NOT SymTab.FieldPending(rec,
-  457                                               tagN) THEN
-  458                                               SemError(200) END; .)
-  459        ":" Type<tagT, FALSE>             (. IF (tagT # SymTab.InvalidType)
-  460    AND NOT SymTab.IsOrdinal(tagT) THEN
-  461                                               SemError(224)
-  462                                             END;
-  463                                             SymTab.FixPendingF(rec, tagT);
-  464                                             SymTab.SetVariantTag(rec, tagN); .)
-  465        "OF"
-  466        RecFieldList<rec>
-  467        { "|"                             (. SymTab.ResetFields(rec); .)
-  468          RecFieldList<rec> }
-  469        "END" .
-  470    RecFieldList<rec: SymTab.TypeIndex>   (. VAR lt, lq: SymTab.TypeIndex;
-  471                                               lv1, lv2: QbeGen.QVal; .)
-  472      = VarLabel<lt, lv1> [ ".." VarLabel<lq, lv2> ] ":"
-  473        RecField<rec> { ";" [ RecField<rec> ] } .
-  474    (* Variant case label: a constant (or a constant range).  Values are
-  475       not interpreted (the layout overlays regardless). *)
-  476    VarLabel<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
-  477                                          (. VAR lname: SymTab.Name; .)
-  478      = ( ident                         (. LexName(lname);
-  479                                             QbeGen.CopyOp("0", q);
-  480                                             t := SymTab.IntType(); .)
-  481        | integer                       (. LexString(lname);
-  482                                             QbeGen.CopyOp("0", q);
-  483                                             t := SymTab.IntType(); .)
-  484        | charConst                     (. LexString(lname);
-  485                                             QbeGen.CopyOp("0", q);
-  486                                             t := SymTab.CharType(); .) ) .
-  487    RecField<rec: SymTab.TypeIndex>       (. VAR n: SymTab.Name;
-  488                                               t2: SymTab.TypeIndex; .)
-  489      = RecIdents<rec> ":" Type<t2, FALSE>(. SymTab.FixPendingF(rec, t2); .) .
-  490    RecIdents<rec: SymTab.TypeIndex>      (. VAR n: SymTab.Name; .)
-  491      = GetIdent<n>                       (. IF NOT SymTab.FieldPending(rec,
-  492                                               n) THEN
-  493                                               SemError(200) END; .)
-  494        { "," GetIdent<n>                 (. IF NOT SymTab.FieldPending(rec,
-  495                                               n) THEN
-  496                                               SemError(200) END; .) } .
-  497    TypeIdent<VAR t: SymTab.TypeIndex>    (. VAR n, qid: SymTab.Name;
-  498                                               k: INTEGER;
-  499                                               dotted: BOOLEAN; .)
-  500      = GetIdent<n>                       (. dotted := FALSE;
-  501                                             IF NOT SymTab.Lookup(n) THEN
-  502                                               k := -1;
-  503                                               t := SymTab.ForwardType(n);
-  504                                               IF t = SymTab.InvalidType THEN
-  505                                                 SemError(201)
-  506                                               END
-  507                                             ELSE k := SymTab.SymKind(n);
-  508                                               IF (k = SymTab.KindType)
-  509                                                  OR (k = SymTab.KindPredef) THEN
-  510                                                 t := SymTab.SymType(n)
-  511                                               ELSE t := SymTab.InvalidType
-  512                                               END
-  513                                             END; .)
-  514        [ "." GetIdent<qid>               (. dotted := TRUE;
-  515                                             IF k = SymTab.KindModule THEN
-  516                                               t := SymTab.QualType(n, qid);
-  517                                               IF t = SymTab.InvalidType THEN
-  518                                                 SemError(201)
-  519                                               END
-  520                                             ELSE SemError(221);
-  521                                               t := SymTab.InvalidType
-  522                                             END; .) ]
-  523                                          (. IF NOT dotted THEN
-  524                                               IF (k = SymTab.KindModule)
-  525                                                  OR ((k # SymTab.KindType)
-  526    AND (k # SymTab.KindPredef)
-  527    AND (k # SymTab.KindImport)
-  528    AND (k # -1)) THEN
-  529                                                 SemError(221)
-  530                                               END
-  531                                             END; .) .
-  532    Subrange<VAR t: SymTab.TypeIndex>     (. VAR tlo, thi: SymTab.TypeIndex;
-  533                                               qlo, qhi: QbeGen.QVal;
-  534                                               lo, hi: INTEGER; .)
-  535      = "[" Expr<tlo, qlo> ".." Expr<thi, qhi>
-  536                                          (. IF (tlo = SymTab.InvalidType)
-  537                                              OR (thi = SymTab.InvalidType) THEN
-  538                                             t := SymTab.InvalidType
-  539                                           ELSIF NOT SymTab.IsOrdinal(tlo)
-  540                                              OR NOT SymTab.IsOrdinal(thi) THEN
-  541                                             SemError(230);
-  542                                             t := SymTab.InvalidType
-  543                                           ELSIF NOT SymTab.ConstInt(qlo, lo)
-  544                                              OR NOT SymTab.ConstInt(qhi, hi)
-  545                                              OR (lo > hi) THEN
-  546                                             SemError(230);
-  547                                             t := SymTab.InvalidType
-  548                                           ELSE t := SymTab.NewSubR(lo, hi)
-  549                                           END; .)
-  550        "]" .
-  551    Enum<VAR t: SymTab.TypeIndex>         (. VAR n: SymTab.Name;
-  552                                               ord: INTEGER;
-  553                                               qv: QbeGen.QVal; .)
-  554      = "("                               (. t := SymTab.NewEnum();
-  555                                             ord := 0; .)
-  556        GetIdent<n>                       (. IF NOT SymTab.Enter(n,
-  557                                               SymTab.KindConst) THEN
-  558                                               SemError(200) END;
-  559                                             SymTab.SetSymType(n, t);
-  560                                             QbeGen.IntStr(ord, qv);
-  561                                             SymTab.SetSymVal(n, qv);
-  562                                             INC(ord); .)
-  563        { "," GetIdent<n>                 (. IF NOT SymTab.Enter(n,
-  564                                               SymTab.KindConst) THEN
-  565                                               SemError(200) END;
-  566                                             SymTab.SetSymType(n, t);
-  567                                             QbeGen.IntStr(ord, qv);
-  568                                             SymTab.SetSymVal(n, qv);
-  569                                             INC(ord); .) }
-  570        ")"                               (. SymTab.SetEnumCount(t,
-  571                                               VAL(CARDINAL, ord)); .) .
-  572    (* Clarion-form classes (docs/OOP.txt): declaration + single
-  573       inheritance + IMPLEMENTATION blocks. Scopes and member checks
-  574       now; lowering (vtable, dispatch, THIS) later — one 230 per
-  575       class/impl block. Methods end with ";" per the Table example
-  576       (not "," as in the sketch). No underscores in identifiers. *)
-  577    (* Single CLASS item in both loops: separating declaration from
-  578       IMPLEMENTATION at the loop level needs 2-token lookahead
-  579       (CLASS ident vs CLASS IMPLEMENTATION), which LL(1) cannot do.
-  580       The second token decides after CLASS is consumed. A misplaced
-  581       CLASS IMPLEMENTATION inside TYPE still parses (harmless: the
-  582       whole unit ends 230 until lowering). *)
-  583    ClassItem
-  584      = "CLASS" ( "IMPLEMENTATION" ClassImplRest | ClassRest ) .
-  585    ClassRest                             (. VAR cn, m2, pn: SymTab.Name;
-  586                                               ct: SymTab.TypeIndex; .)
-  587      = GetIdent<cn>                      (. IF NOT SymTab.Enter(cn,
-  588                                               SymTab.KindType) THEN
-  589                                               SemError(200) END;
-  590                                             ct := SymTab.NewClass();
-  591                                             SymTab.SetSymType(cn, ct);
-  592                                             SymTab.PushClassScope(ct); .)
-  593        [ Parents<ct> ]
-  594        ";"
-  595        { ClassField<ct> ";" }
-  596        { MethodHeading<pn, SymTab.InvalidType> ";"
-  597                                          (. SymTab.CloseProc;
-  598                                             QbeGen.AbortFunc; .) }
-  599        "END"
-  600        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
-  601                                               SemError(202) END;
-  602                                             SymTab.LayoutClass(ct);
-  603                                             SymTab.PopScope; .) .
-  604    Parents<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name; .)
-  605      = "(" Parent1<ct>
-  606        { "," GetIdent<p>                 (. SemError(230); .) }
-  607        ")" .
-  608    Parent1<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name;
-  609                                               pt: SymTab.TypeIndex; .)
-  610      = GetIdent<p>                       (. IF NOT SymTab.Lookup(p) THEN
-  611                                               SemError(201)
-  612                                             ELSE pt := SymTab.SymType(p);
-  613                                               IF SymTab.ClassOf(pt) #
-  614                                                  SymTab.ClClass THEN
-  615                                                 SemError(230)
-  616                                               ELSE SymTab.SetParent(ct, pt)
-  617                                               END
-  618                                             END; .) .
-  619    ClassField<ct: SymTab.TypeIndex>      (. VAR n, rhs: SymTab.Name;
-  620                                               t: SymTab.TypeIndex; .)
-  621      = GetIdent<n>
-  622        ( "=" GetIdent<rhs>               (. IF NOT SymTab.Enter(n,
-  623                                               SymTab.KindConst) THEN
-  624                                               SemError(200) END;
-  625                                             IF SymTab.Lookup(rhs) THEN
-  626                                               SymTab.SetSymType(n,
-  627                                                 SymTab.SymType(rhs))
-  628                                             END; .)
-  629        |                                 (. IF NOT SymTab.FieldPending(ct,
-  630                                               n) THEN
-  631                                               SemError(200) END; .)
-  632          { "," GetIdent<n>               (. IF NOT SymTab.FieldPending(ct,
-  633                                               n) THEN
-  634                                               SemError(200) END; .) }
-  635          ":" Type<t, FALSE>              (. SymTab.FixPendingF(ct, t); .) ) .
-  636    MethodHeading<VAR pn: SymTab.Name; ct: SymTab.TypeIndex>
-  637                                          (. VAR wantVirt: BOOLEAN; .)
-  638      =                                   (. wantVirt := FALSE; .)
-  639        [ "VIRTUAL"                       (. wantVirt := TRUE; .) ]
-  640        ProcHeading<pn, ct>               (. IF wantVirt THEN
-  641                                               SymTab.MarkVirtual END; .) .
-  642    ClassImplRest                         (. VAR cn, m2: SymTab.Name;
-  643                                               ct: SymTab.TypeIndex; .)
-  644      = GetIdent<cn>                      (. IF NOT SymTab.Lookup(cn) THEN
-  645                                               SemError(201);
-  646                                               ct := SymTab.InvalidType
-  647                                             ELSE ct := SymTab.SymType(cn);
-  648                                               IF SymTab.ClassOf(ct) #
-  649                                                  SymTab.ClClass THEN
-  650                                                 SemError(230);
-  651                                                 ct := SymTab.InvalidType
-  652                                               END
-  653                                             END;
-  654                                             IF ct #
-  655                                                SymTab.InvalidType THEN
-  656                                               IF NOT SymTab.PushClassMembers(
-  657                                                      ct) THEN
-  658                                                 SemError(230) END;
-  659                                               SymTab.PushImplClass(ct)
+  211                                             QbeGen.EndModule(m1);
+  212                                             SymTab.EndUnit; .) .
+  213    DeclSeq
+  214      = { ConstBlock | TypeBlock<FALSE> | VarBlock | ProcDecl ";"
+  215        | NestedModule ";" | ClassItem ";" } .
+  216    (* Local module, Wirth form. Declarations lower like top-level ones
+  217       (same QBE module prefix); a BEGIN body becomes an init function
+  218       that main calls; the EXPORT list is hoisted into the enclosing
+  219       scope at END. *)
+  220    NestedModule                          (. VAR m1, m2: SymTab.Name;
+  221                                               expNames: ARRAY [0 .. 63] OF SymTab.Name;
+  222                                               expCount, k: CARDINAL; .)
+  223      = "MODULE"
+  224        GetIdent<m1>                      (. IF NOT SymTab.Enter(m1,
+  225                                               SymTab.KindModule) THEN
+  226                                               SemError(200) END;
+  227                                             SymTab.PushScope;
+  228                                             expCount := 0; .)
+  229        [ Priority ]
+  230        ";"
+  231        { Import }
+  232        [ "EXPORT" [ "QUALIFIED" ]
+  233          GetIdent<expNames[expCount]>    (. INC(expCount); .)
+  234          { "," GetIdent<expNames[expCount]>
+  235                                          (. INC(expCount); .) }
+  236          ";" ]
+  237        DeclSeq
+  238        [ "BEGIN"                         (. QbeGen.BeginInit(m1); .)
+  239          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
+  240        "END"
+  241        GetIdent<m2>                      (. IF NOT SymTab.Equal(m1, m2) THEN
+  242                                               SemError(202) END;
+  243                                             k := 0;
+  244                                             WHILE k < expCount DO
+  245                                               SymTab.ExportUp(expNames[k]);
+  246                                               INC(k)
+  247                                             END;
+  248                                             SymTab.PopScope; .) .
+  249    Priority
+  250      = "[" integer "]"                   (. SemError(230); .) .
+  251    (* Imports (4.3): FROM materializes the names (unqualified use);
+  252       plain IMPORT only demands the module exists — qualified `L.x`
+  253       materializes on first use (Design). *)
+  254    (* Unknown modules stay unchecked stubs (legacy, so hand-written
+  255       import lines don't fail); a known module's missing export is
+  256       201. *)
+  257    Import                                (. VAR n: SymTab.Name; .)
+  258      = "FROM"
+  259        GetIdent<n>
+  260        "IMPORT"
+  261        ImpList<n> ";"
+  262      | "IMPORT"
+  263        ImpModList ";" .
+  264    ImpList<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
+  265      = ImpName<mod>
+  266        { "," ImpName<mod> } .
+  267    (* Pervasive built-ins imported from SYSTEM (e.g. TSIZE) are
+  268       accepted and ignored: the built-in applies regardless. *)
+  269    ImpName<mod: SymTab.Name>             (. VAR n: SymTab.Name; .)
+  270      = GetIdent<n>                       (. IF SymTab.Equal(mod, "libc") THEN
+  271                                               (* intrinsic C library:
+  272                                                  permissive external *)
+  273                                               IF NOT SymTab.DeclareCProc(n) THEN
+  274                                                 SemError(201) END
+  275                                             ELSIF SymTab.ModKnown(mod)
+  276                                               AND NOT SymTab.ImportFrom(mod, n) THEN
+  277                                               SemError(201) END; .)
+  278      | ( "TSIZE" | "SIZE" | "ADR" | "HIGH" | "LEN"
+  279        | "CHR" | "ORD" | "ORDL" | "VAL" | "ABS" | "CAP"
+  280        | "UCHR" | "CHR8" | "UORD"
+  281        | "INC" | "DEC" ) .
+  282    ImpModList                            (. VAR n: SymTab.Name; .)
+  283      = GetIdent<n>
+  284        { "," GetIdent<n> } .
+  285    (* Opaque TYPE declarations (definition modules). The targetless
+  286       alias resolves to InvalidType until step 4 completes it. *)
+  287    (* Scalar-phase TYPEs: named types, integer subranges, enumerations.
+  288       Opaque "TYPE T;" needs isDef (definition units); elsewhere 231.
+  289       Composite forms (ARRAY/RECORD/SET/POINTER) arrive with step 3. *)
+  290    TypeBlock<isDef: BOOLEAN>
+  291      = "TYPE"                            (. SymTab.BeginTypeBlock; .)
+  292        { TypeItem<isDef> ";" | ClassItem ";" }
+  293                                          (. SymTab.EndTypeBlock; .) .
+  294    TypeItem<isDef: BOOLEAN>              (. VAR n: SymTab.Name;
+  295                                               t, op: SymTab.TypeIndex; .)
+  296      = GetIdent<n>                       (. op := SymTab.OpaqueBase(n);
+  297                                             IF op = SymTab.InvalidType THEN
+  298                                               IF NOT SymTab.Enter(n,
+  299                                                  SymTab.KindType) THEN
+  300                                                 SemError(200) END
+  301                                             END; .)
+  302        ( "=" Type<t, FALSE>              (. IF op # SymTab.InvalidType THEN
+  303                                               SymTab.SetTarget(op, t)
+  304                                             ELSE SymTab.SetSymType(n, t)
+  305                                             END; .)
+  306        |                                 (. IF op # SymTab.InvalidType THEN
+  307                                               (* stays opaque *)
+  308                                             ELSIF NOT isDef THEN
+  309                                               SemError(231)
+  310                                             ELSE SymTab.SetSymType(n,
+  311                                               SymTab.NewAlias()) END; .) ) .
+  312    Type<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
+  313      = TypeIdent<t> [ Subrange<t> ]     (* anchored subrange: T[lo..hi] *)
+  314      | Subrange<t>
+  315      | Enum<t>
+  316      | ArrayType<t, allowOpen>
+  317      | SetType<t>
+  318      | RecordType<t>
+  319      | PointerType<t>
+  320      | ProcType<t> .
+  321    PointerType<VAR t: SymTab.TypeIndex>  (. VAR base: SymTab.TypeIndex; .)
+  322      = "POINTER" "TO" Type<base, FALSE>(. t := SymTab.NewPtr(base); .) .
+  323    (* Procedure types (step 8.5): PROCEDURE (params): result. Values
+  324       are code pointers; params are collected into the descriptor. *)
+  325    ProcType<VAR t: SymTab.TypeIndex>     (. VAR res, pt: SymTab.TypeIndex;
+  326                                               isV: BOOLEAN; .)
+  327      = "PROCEDURE"                       (. res := SymTab.InvalidType;
+  328                                             t := SymTab.NewProcType(res); .)
+  329        [ "(" [ ProcTypeSection<t> { ";" ProcTypeSection<t> } ] ")" ]
+  330        [ ":" TypeIdent<res>              (. SymTab.SetProcTypeRes(t, res); .) ] .
+  331    ProcTypeSection<t: SymTab.TypeIndex>  (. VAR pt: SymTab.TypeIndex;
+  332                                               isV: BOOLEAN;
+  333                                               cnt, k: CARDINAL;
+  334                                               names: ARRAY [0 .. 15] OF SymTab.Name; .)
+  335      =                                   (. isV := FALSE; cnt := 0; .)
+  336        [ "VAR"                           (. isV := TRUE; .) ]
+  337        ( GetIdent<names[cnt]>            (. INC(cnt); .)
+  338          { "," GetIdent<names[cnt]>      (. INC(cnt); .) }
+  339          ( ":" Type<pt, TRUE>           (. k := 0;
+  340                                             WHILE k < cnt DO
+  341                                               SymTab.ProcTypeAdd(t, isV, pt);
+  342                                               INC(k)
+  343                                             END; .)
+  344          |                               (. (* type-only parameter list:
+  345                                                each name is a type (GNU
+  346                                                shorthand used by the
+  347                                                Coco/R scanner frame) *)
+  348                                             k := 0;
+  349                                             WHILE k < cnt DO
+  350                                               IF SymTab.Lookup(names[k])
+  351                                                  AND ((SymTab.SymKind(names[k]) = SymTab.KindType)
+  352    OR (SymTab.SymKind(names[k]) = SymTab.KindPredef)) THEN
+  353                                                 pt := SymTab.SymType(names[k])
+  354                                               ELSE SemError(201);
+  355                                                 pt := SymTab.InvalidType
+  356                                               END;
+  357                                               SymTab.ProcTypeAdd(t, isV, pt);
+  358                                               INC(k)
+  359                                             END; .) )
+  360        | Type<pt, TRUE>                 (. (* unnamed parameter (PIM):
+  361                                                e.g. PROCEDURE (VAR ARRAY OF REAL) *)
+  362                                             SymTab.ProcTypeAdd(t, isV, pt); .) ) .
+  363    (* Arrays: "OF" without bounds is an open formal (allowed only
+  364       where allowOpen); "[lo..hi, ...]" nests bounded levels inside
+  365       out. Bounds are folded literals (int/char); anything else 230.
+  366       Bare-type indices ("ARRAY Color OF") wait for enum ordinals. *)
+  367    ArrayType<VAR t: SymTab.TypeIndex; allowOpen: BOOLEAN>
+  368                                          (. VAR elem: SymTab.TypeIndex;
+  369                                               ok: BOOLEAN;
+  370                                               bnds, bndh: ARRAY [0 .. 7] OF INTEGER;
+  371                                               nb, k: CARDINAL;
+  372                                               idx: SymTab.TypeIndex;
+  373                                               ilo, ihi: INTEGER; .)
+  374      = "ARRAY"
+  375        ( "OF" Type<elem, FALSE>          (. IF NOT allowOpen THEN
+  376                                               SemError(230) END;
+  377                                             t := SymTab.NewOpenArray(elem); .)
+  378        | TypeIdent<idx> [ Subrange<idx> ]
+  379          "OF" Type<elem, FALSE>          (. (* index-type array: the index
+  380                                                type's ordinal bounds give the
+  381                                                [lo..hi] pair *)
+  382                                             IF SymTab.TypeBounds(idx, ilo,
+  383                                                ihi)
+  384                                             THEN t := SymTab.NewArrayB(elem,
+  385                                                    ilo, ihi)
+  386                                             ELSE SemError(230);
+  387                                               t := SymTab.InvalidType
+  388                                             END; .)
+  389        | "["                             (. SymTab.BoundBegin; ok := TRUE; .)
+  390          BoundPair<ok>
+  391          { "," BoundPair<ok> }
+  392          "]"                             (. (* snapshot before the element
+  393                                                type, which reuses the bound
+  394                                                buffer for a nested ARRAY *)
+  395                                             nb := SymTab.BoundCount();
+  396                                             k := 0;
+  397                                             WHILE k < nb DO
+  398                                               bnds[k] := SymTab.BoundLo(k);
+  399                                               bndh[k] := SymTab.BoundHi(k);
+  400                                               INC(k)
+  401                                             END; .)
+  402          "OF" Type<elem, FALSE>
+  403                                          (. IF ok THEN
+  404                                               k := nb;
+  405                                               WHILE k > 0 DO
+  406                                                 DEC(k);
+  407                                                 elem := SymTab.NewArrayB(
+  408                                                   elem, bnds[k], bndh[k])
+  409                                               END;
+  410                                               t := elem
+  411                                             ELSE t := SymTab.InvalidType
+  412                                             END; .) ) .
+  413    BoundPair<VAR ok: BOOLEAN>            (. VAR tlo, thi: SymTab.TypeIndex;
+  414                                               qlo, qhi: QbeGen.QVal;
+  415                                               lo, hi: INTEGER;
+  416                                               cl, cl2: INTEGER; .)
+  417      = Expr<tlo, qlo> ".." Expr<thi, qhi>
+  418                                          (. IF (tlo = SymTab.InvalidType)
+  419                                              OR (thi = SymTab.InvalidType) THEN
+  420                                             ok := FALSE
+  421                                           ELSE cl := SymTab.ClassOf(tlo);
+  422                                             cl2 := SymTab.ClassOf(thi);
+  423                                             IF ((cl # SymTab.ClInt)
+  424   AND (cl # SymTab.ClChar))
+  425                                                OR ((cl2 # SymTab.ClInt)
+  426   AND (cl2 # SymTab.ClChar)) THEN
+  427                                               SemError(230); ok := FALSE
+  428                                             ELSIF NOT SymTab.ConstInt(qlo, lo)
+  429                                                OR NOT SymTab.ConstInt(qhi, hi)
+  430                                                OR (lo > hi) THEN
+  431                                               SemError(230); ok := FALSE
+  432                                              ELSIF NOT SymTab.BoundAdd(lo, hi) THEN
+  433                                                SemError(230); ok := FALSE
+  434                                              END;
+  435                                            END; .) .
+  436    (* Sets: multi-word masks over bases ≤ 256 values (bool, char,
+  437       bounded subranges; enums wait for ordinals, INTEGER is
+  438       unbounded). Literals are SET OF [0..255]; assignment and
+  439       comparison across suitable bases are lenient (masks over min
+  440       words + zero-check extras), out-of-span literals are 222. *)
+  441    SetType<VAR t: SymTab.TypeIndex>      (. VAR base: SymTab.TypeIndex;
+  442                                               blo, bhi, bspan: INTEGER;
+  443                                               bcls: INTEGER; .)
+  444      = "SET" "OF" Type<base, FALSE>
+  445                                          (. IF base = SymTab.InvalidType THEN
+  446                                               t := SymTab.InvalidType
+  447                                             ELSE bcls :=
+  448                                                    SymTab.ClassOf(base);
+  449                                               IF bcls = SymTab.ClBool THEN
+  450                                                 blo := 0; bspan := 2
+  451                                               ELSIF bcls = SymTab.ClChar THEN
+  452                                                 blo := 0; bspan := 256
+  453                                               ELSIF bcls = SymTab.ClEnum THEN
+  454                                                 blo := 0;
+  455                                                 bspan := VAL(INTEGER,
+  456                                                   SymTab.EnumCount(base))
+  457                                               ELSIF SymTab.SubBounds(base,
+  458                                                       blo, bhi) THEN
+  459                                                 bspan := bhi - blo + 1
+  460                                               ELSE bspan := 0 END;
+  461                                               IF (bspan <= 0)
+  462                                                  OR (bspan > 65536) THEN
+  463                                                 SemError(230);
+  464                                                 t := SymTab.InvalidType
+  465                                               ELSE t := SymTab.NewSet(base)
+  466                                               END
+  467                                             END; .) .
+  468    (* Records: flat blobs; array fields are pointers to static
+  469       descriptors (locked amendment), nested records inline. Field
+  470       offsets static and declaration-ordered. *)
+  471    (* Field list: plain fields and (optionally) one variant part.  The
+  472       variant part is a `CASE ... END` item; because it starts with the
+  473       CASE keyword it is unambiguously distinguishable from a field
+  474       (which starts with an identifier). *)
+  475    RecordType<VAR t: SymTab.TypeIndex>   (. VAR t2: SymTab.TypeIndex;
+  476                                               tagOk: BOOLEAN; .)
+  477      = "RECORD"                          (. t := SymTab.NewRecord(); .)
+  478        [ RecItem<t> { ";" [ RecItem<t> ] } ]
+  479        "END" .
+  480    RecItem<rec: SymTab.TypeIndex>        (. VAR tt: SymTab.TypeIndex; .)
+  481      = RecField<rec>
+  482      | CaseField<rec>                    (. SymTab.MarkVariant(rec); .) .
+  483    (* A variant part: CASE tag : Type OF variants.  The layout overlays
+  484       every branch from the tag slot (see SymTab.ComputeOffsets). *)
+  485    CaseField<rec: SymTab.TypeIndex>      (. VAR tagT: SymTab.TypeIndex;
+  486                                               tagN: SymTab.Name; .)
+  487      = "CASE"                            (. SymTab.ResetFields(rec); .)
+  488        GetIdent<tagN>                    (. IF NOT SymTab.FieldPending(rec,
+  489                                               tagN) THEN
+  490                                               SemError(200) END; .)
+  491        ":" Type<tagT, FALSE>             (. IF (tagT # SymTab.InvalidType)
+  492    AND NOT SymTab.IsOrdinal(tagT) THEN
+  493                                               SemError(224)
+  494                                             END;
+  495                                             SymTab.FixPendingF(rec, tagT);
+  496                                             SymTab.SetVariantTag(rec, tagN); .)
+  497        "OF"
+  498        RecFieldList<rec>
+  499        { "|"                             (. SymTab.ResetFields(rec); .)
+  500          RecFieldList<rec> }
+  501        "END" .
+  502    RecFieldList<rec: SymTab.TypeIndex>   (. VAR lt, lq: SymTab.TypeIndex;
+  503                                               lv1, lv2: QbeGen.QVal; .)
+  504      = VarLabel<lt, lv1> [ ".." VarLabel<lq, lv2> ] ":"
+  505        RecField<rec> { ";" [ RecField<rec> ] } .
+  506    (* Variant case label: a constant (or a constant range).  Values are
+  507       not interpreted (the layout overlays regardless). *)
+  508    VarLabel<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+  509                                          (. VAR lname: SymTab.Name; .)
+  510      = ( ident                         (. LexName(lname);
+  511                                             QbeGen.CopyOp("0", q);
+  512                                             t := SymTab.IntType(); .)
+  513        | integer                       (. LexString(lname);
+  514                                             QbeGen.CopyOp("0", q);
+  515                                             t := SymTab.IntType(); .)
+  516        | charConst                     (. LexString(lname);
+  517                                             QbeGen.CopyOp("0", q);
+  518                                             t := SymTab.CharType(); .) ) .
+  519    RecField<rec: SymTab.TypeIndex>       (. VAR n: SymTab.Name;
+  520                                               t2: SymTab.TypeIndex; .)
+  521      = RecIdents<rec> ":" Type<t2, FALSE>(. SymTab.FixPendingF(rec, t2); .) .
+  522    RecIdents<rec: SymTab.TypeIndex>      (. VAR n: SymTab.Name; .)
+  523      = GetIdent<n>                       (. IF NOT SymTab.FieldPending(rec,
+  524                                               n) THEN
+  525                                               SemError(200) END; .)
+  526        { "," GetIdent<n>                 (. IF NOT SymTab.FieldPending(rec,
+  527                                               n) THEN
+  528                                               SemError(200) END; .) } .
+  529    TypeIdent<VAR t: SymTab.TypeIndex>    (. VAR n, qid: SymTab.Name;
+  530                                               k: INTEGER;
+  531                                               dotted: BOOLEAN; .)
+  532      = GetIdent<n>                       (. dotted := FALSE;
+  533                                             IF NOT SymTab.Lookup(n) THEN
+  534                                               k := -1;
+  535                                               t := SymTab.ForwardType(n);
+  536                                               IF t = SymTab.InvalidType THEN
+  537                                                 SemError(201)
+  538                                               END
+  539                                             ELSE k := SymTab.SymKind(n);
+  540                                               IF (k = SymTab.KindType)
+  541                                                  OR (k = SymTab.KindPredef) THEN
+  542                                                 t := SymTab.SymType(n)
+  543                                               ELSE t := SymTab.InvalidType
+  544                                               END
+  545                                             END; .)
+  546        [ "." GetIdent<qid>               (. dotted := TRUE;
+  547                                             IF k = SymTab.KindModule THEN
+  548                                               t := SymTab.QualType(n, qid);
+  549                                               IF t = SymTab.InvalidType THEN
+  550                                                 SemError(201)
+  551                                               END
+  552                                             ELSE SemError(221);
+  553                                               t := SymTab.InvalidType
+  554                                             END; .) ]
+  555                                          (. IF NOT dotted THEN
+  556                                               IF (k = SymTab.KindModule)
+  557                                                  OR ((k # SymTab.KindType)
+  558    AND (k # SymTab.KindPredef)
+  559    AND (k # SymTab.KindImport)
+  560    AND (k # -1)) THEN
+  561                                                 SemError(221)
+  562                                               END
+  563                                             END; .) .
+  564    Subrange<VAR t: SymTab.TypeIndex>     (. VAR tlo, thi: SymTab.TypeIndex;
+  565                                               qlo, qhi: QbeGen.QVal;
+  566                                               lo, hi: INTEGER; .)
+  567      = "[" Expr<tlo, qlo> ".." Expr<thi, qhi>
+  568                                          (. IF (tlo = SymTab.InvalidType)
+  569                                              OR (thi = SymTab.InvalidType) THEN
+  570                                             t := SymTab.InvalidType
+  571                                           ELSIF NOT SymTab.IsOrdinal(tlo)
+  572                                              OR NOT SymTab.IsOrdinal(thi) THEN
+  573                                             SemError(230);
+  574                                             t := SymTab.InvalidType
+  575                                           ELSIF NOT SymTab.ConstInt(qlo, lo)
+  576                                              OR NOT SymTab.ConstInt(qhi, hi)
+  577                                              OR (lo > hi) THEN
+  578                                             SemError(230);
+  579                                             t := SymTab.InvalidType
+  580                                           ELSE t := SymTab.NewSubR(lo, hi)
+  581                                           END; .)
+  582        "]" .
+  583    Enum<VAR t: SymTab.TypeIndex>         (. VAR n: SymTab.Name;
+  584                                               ord: INTEGER;
+  585                                               qv: QbeGen.QVal; .)
+  586      = "("                               (. t := SymTab.NewEnum();
+  587                                             ord := 0; .)
+  588        GetIdent<n>                       (. IF NOT SymTab.Enter(n,
+  589                                               SymTab.KindConst) THEN
+  590                                               SemError(200) END;
+  591                                             SymTab.SetSymType(n, t);
+  592                                             QbeGen.IntStr(ord, qv);
+  593                                             SymTab.SetSymVal(n, qv);
+  594                                             INC(ord); .)
+  595        { "," GetIdent<n>                 (. IF NOT SymTab.Enter(n,
+  596                                               SymTab.KindConst) THEN
+  597                                               SemError(200) END;
+  598                                             SymTab.SetSymType(n, t);
+  599                                             QbeGen.IntStr(ord, qv);
+  600                                             SymTab.SetSymVal(n, qv);
+  601                                             INC(ord); .) }
+  602        ")"                               (. SymTab.SetEnumCount(t,
+  603                                               VAL(CARDINAL, ord)); .) .
+  604    (* Clarion-form classes (docs/OOP.txt): declaration + single
+  605       inheritance + IMPLEMENTATION blocks. Scopes and member checks
+  606       now; lowering (vtable, dispatch, THIS) later — one 230 per
+  607       class/impl block. Methods end with ";" per the Table example
+  608       (not "," as in the sketch). No underscores in identifiers. *)
+  609    (* Single CLASS item in both loops: separating declaration from
+  610       IMPLEMENTATION at the loop level needs 2-token lookahead
+  611       (CLASS ident vs CLASS IMPLEMENTATION), which LL(1) cannot do.
+  612       The second token decides after CLASS is consumed. A misplaced
+  613       CLASS IMPLEMENTATION inside TYPE still parses (harmless: the
+  614       whole unit ends 230 until lowering). *)
+  615    ClassItem
+  616      = "CLASS" ( "IMPLEMENTATION" ClassImplRest | ClassRest ) .
+  617    ClassRest                             (. VAR cn, m2, pn: SymTab.Name;
+  618                                               ct: SymTab.TypeIndex; .)
+  619      = GetIdent<cn>                      (. IF NOT SymTab.Enter(cn,
+  620                                               SymTab.KindType) THEN
+  621                                               SemError(200) END;
+  622                                             ct := SymTab.NewClass();
+  623                                             SymTab.SetSymType(cn, ct);
+  624                                             SymTab.PushClassScope(ct); .)
+  625        [ Parents<ct> ]
+  626        ";"
+  627        { ClassField<ct> ";" }
+  628        { MethodHeading<pn, SymTab.InvalidType> ";"
+  629                                          (. SymTab.CloseProc;
+  630                                             QbeGen.AbortFunc; .) }
+  631        "END"
+  632        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
+  633                                               SemError(202) END;
+  634                                             SymTab.LayoutClass(ct);
+  635                                             SymTab.PopScope; .) .
+  636    Parents<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name; .)
+  637      = "(" Parent1<ct>
+  638        { "," GetIdent<p>                 (. SemError(230); .) }
+  639        ")" .
+  640    Parent1<ct: SymTab.TypeIndex>         (. VAR p: SymTab.Name;
+  641                                               pt: SymTab.TypeIndex; .)
+  642      = GetIdent<p>                       (. IF NOT SymTab.Lookup(p) THEN
+  643                                               SemError(201)
+  644                                             ELSE pt := SymTab.SymType(p);
+  645                                               IF SymTab.ClassOf(pt) #
+  646                                                  SymTab.ClClass THEN
+  647                                                 SemError(230)
+  648                                               ELSE SymTab.SetParent(ct, pt)
+  649                                               END
+  650                                             END; .) .
+  651    ClassField<ct: SymTab.TypeIndex>      (. VAR n, rhs: SymTab.Name;
+  652                                               t: SymTab.TypeIndex; .)
+  653      = GetIdent<n>
+  654        ( "=" GetIdent<rhs>               (. IF NOT SymTab.Enter(n,
+  655                                               SymTab.KindConst) THEN
+  656                                               SemError(200) END;
+  657                                             IF SymTab.Lookup(rhs) THEN
+  658                                               SymTab.SetSymType(n,
+  659                                                 SymTab.SymType(rhs))
   660                                             END; .)
-  661        ";" { MethodImpl<ct> ";" }
-  662        [ "BEGIN"                         (. QbeGen.BeginInit(cn); .)
-  663          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
-  664        "END"
-  665        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
-  666                                               SemError(202) END;
-  667                                             SymTab.PopImplClass;
-  668                                             SymTab.PopScope; .) .
-  669    MethodImpl<ct: SymTab.TypeIndex>      (. VAR pn: SymTab.Name;
-  670                                               thisQ: QbeGen.QVal;
-  671                                               methRes: SymTab.TypeIndex; .)
-  672      = MethodHeading<pn, ct> ";"
-  673                                          (. IF (ct #
-  674                                                SymTab.InvalidType)
-  675   AND NOT SymTab.MethodExists(ct,
-  676                                                    pn) THEN
-  677                                               SemError(201) END; .)
-  678        ( "FORWARD"                       (. SymTab.MarkFwd;
-  679                                             QbeGen.AbortFunc;
-  680                                             SymTab.CloseProc; .)
-  681        |                                 (. QbeGen.EndFuncHeader;
-  682                                             (* bind the receiver: bare
-  683                                                field names resolve
-  684                                                against THIS *)
-  685                                             QbeGen.ThisBase(thisQ);
-  686                                             QbeGen.PushWith(thisQ); .)
-  687          Block<pn>                       (. QbeGen.PopWith;
-  688                                             methRes := SymTab.CurRes();
-  689                                             SymTab.CloseProc;
-  690                                             QbeGen.EndFunc(methRes); .) ) .
-  691    ConstBlock
-  692      = "CONST" { ConstDecl ";" } .
-  693    ConstDecl                             (. VAR n: SymTab.Name;
-  694                                               t: SymTab.TypeIndex;
-  695                                               qv: QbeGen.QVal;
-  696                                               cls: INTEGER; .)
-  697      = GetIdent<n>                       (. IF NOT SymTab.Enter(n,
-  698                                               SymTab.KindConst) THEN
-  699                                               SemError(200) END; .)
-  700        "="
-  701        Expr<t, qv>                       (. SymTab.SetSymType(n, t);
-  702                                             cls := SymTab.ClassOf(t);
-  703                                             IF (cls = SymTab.ClArray)
-  704                                                OR (cls = SymTab.ClRecord)
-  705                                                OR (cls = SymTab.ClClass)
-  706                                                OR (cls = SymTab.ClStr)
-  707                                                OR (cls = SymTab.ClUStr) THEN
-  708                                               (* an aggregate/string
-  709                                                  constant: qv is its
-  710                                                  descriptor address; no
-  711                                                  scalar data *)
-  712                                               SymTab.SetSymVal(n, qv)
-  713                                             ELSIF NOT QbeGen.IsImm(qv) THEN
-  714                                               SemError(230)
-  715                                             ELSE
-  716                                               SymTab.SetSymVal(n, qv);
-  717                                               QbeGen.DeclConst(n, qv, t)
-  718                                             END; .) .
-  719    VarBlock
-  720      = "VAR" { VarDecl ";" } .
-  721    VarDecl                               (. VAR nm: SymTab.Name;
-  722                                               t: SymTab.TypeIndex;
-  723                                               i: CARDINAL;
-  724                                               cls: INTEGER; .)
-  725      = VarIdents ":"
-  726        Type<t, FALSE>                    (. cls := SymTab.ClassOf(t);
-  727                                             IF (t # SymTab.InvalidType)
-  728   AND NOT SymTab.IsUnresolved(t)
-  729   AND (cls # SymTab.ClInt)
-  730   AND (cls # SymTab.ClBool)
-  731   AND (cls # SymTab.ClChar)
-  732   AND (cls # SymTab.ClReal)
-  733   AND (cls # SymTab.ClArray)
-  734   AND (cls # SymTab.ClSet)
-  735   AND (cls # SymTab.ClRecord)
-  736   AND (cls # SymTab.ClPtr)
-  737   AND (cls # SymTab.ClLong)
-  738   AND (cls # SymTab.ClProc)
-  739   AND (cls # SymTab.ClUChar)
-  740   AND (cls # SymTab.ClUStr)
-  741   AND (cls # SymTab.ClEnum)
-  742   AND (cls # SymTab.ClClass) THEN
-  743                                               SemError(230) END;
-  744                                             IF QbeGen.LocFull() THEN
-  745                                               SemError(233) END;
-  746                                             i := 0;
-  747                                             IF SymTab.IsUnresolved(t)
-  748                                                AND NOT SymTab.InProc() THEN
-  749                                               (* a forward-typed global:
-  750                                                  defer emission until the
-  751                                                  TYPE block completes *)
-  752                                               WHILE i < SymTab.PendCount() DO
-  753                                                 SymTab.PendName(i, nm);
-  754                                                 IF nPendVar <=
-  755                                                    HIGH(pendVarName) THEN
-  756                                                   pendVarName[nPendVar] := nm;
-  757                                                   pendVarT[nPendVar] := t;
-  758                                                   INC(nPendVar)
-  759                                                 END;
-  760                                                 INC(i)
-  761                                               END
-  762                                             ELSE
-  763                                               WHILE i < SymTab.PendCount() DO
-  764                                                 SymTab.PendName(i, nm);
-  765                                                 QbeGen.DeclVar(nm, t);
-  766                                                 INC(i)
-  767                                               END
-  768                                             END;
-  769                                             (* a plain VAR list, not a
-  770                                                heading: the signature
-  771                                                result is discarded *)
-  772                                             IF NOT SymTab.FixPending(t) THEN
-  773                                             END; .) .
-  774    VarIdents                             (. VAR n: SymTab.Name; .)
-  775      = GetIdent<n>                       (. IF NOT SymTab.EnterPending(n,
-  776                                               SymTab.KindVar) THEN
-  777                                               SemError(200) END; .)
-  778        { ","
-  779          GetIdent<n>                     (. IF NOT SymTab.EnterPending(n,
-  780                                               SymTab.KindVar) THEN
-  781                                               SemError(200) END; .) } .
-  782    ParIdents<isV: BOOLEAN>               (. VAR n: SymTab.Name; .)
-  783      = GetIdent<n>                       (. IF NOT SymTab.EnterParam(n, isV) THEN
-  784                                               SemError(200) END; .)
-  785        { "," GetIdent<n>                 (. IF NOT SymTab.EnterParam(n, isV) THEN
-  786                                               SemError(200) END; .) } .
-  787    (* Procedure headings enter scopes/params/result and buffer the
-  788       QBE header; bodies lower to functions (4.1, module level only).
-  789       FORWARD marks; the body heading re-enters (signature compare
-  790       deferred). Nested procedures parse + check, lowering = 4.2. *)
-  791    ProcHeading<VAR pn: SymTab.Name; methCls: SymTab.TypeIndex>
-  792                                          (. VAR t: SymTab.TypeIndex;
-  793                                               mg: QbeGen.QVal; .)
-  794      = "PROCEDURE"
-  795        GetIdent<pn>                      (. IF methCls #
-  796                                                SymTab.InvalidType THEN
-  797                                             (* a method: resume the
-  798                                                declared symbol (reuse
-  799                                                its uid) *)
-  800                                             IF NOT SymTab.ResumeMethod(
-  801                                                  methCls, pn) THEN
-  802                                               SemError(200) END
-  803                                             ELSIF NOT SymTab.EnterProc(pn) THEN
-  804                                             IF NOT SymTab.ReenterProc(pn) THEN
-  805                                               IF NOT SymTab.ResumeProc(pn) THEN
-  806                                                 SemError(200) END
-  807                                               END
-  808                                             END;
-  809                                             IF methCls #
-  810                                                SymTab.InvalidType THEN
-  811                                               QbeGen.Mangled(pn,
-  812                                                 SymTab.MethUid(), mg)
-  813                                             ELSE
-  814                                               QbeGen.Mangled(pn,
-  815                                                 SymTab.ProcUid(pn), mg)
-  816                                             END;
-  817                                             QbeGen.BeginFunc(mg);
-  818                                             IF methCls #
-  819                                                SymTab.InvalidType THEN
-  820                                               (* hidden THIS receiver:
-  821                                                  a VAR param of the
-  822                                                  class type, pushed as
-  823                                                  the WITH base *)
-  824                                               IF NOT SymTab.EnterThisParam(
-  825                                                    methCls) THEN
-  826                                                 SemError(200) END;
-  827                                               IF NOT QbeGen.FuncParam(
-  828                                                    "THIS", TRUE,
-  829                                                    methCls) THEN
-  830                                                 SemError(233) END
-  831                                             END; .)
-  832        [ FormalParams ]
-  833        [ ":" TypeIdent<t>                (. IF NOT SymTab.SetProcRes(t) THEN
-  834                                               SemError(235) END;
-  835                                             QbeGen.SetFuncRes(t);
-  836                                             IF (t #
-  837                                                SymTab.InvalidType)
-  838   AND ((SymTab.ClassOf(t)
-  839                                                   = SymTab.ClArray)
-  840                                                OR (SymTab.ClassOf(t)
-  841                                                   = SymTab.ClRecord)
-  842                                                OR (SymTab.ClassOf(t)
-  843                                                   = SymTab.ClSet)
-  844                                                OR (SymTab.ClassOf(t)
-  845                                                   = SymTab.ClClass)) THEN
-  846                                               SemError(230) END; .) ] .
-  847    FormalParams
-  848      = "(" [ ParamSection { ";" ParamSection } ] ")" .
-  849    ParamSection                          (. VAR t: SymTab.TypeIndex;
-  850                                               nm: SymTab.Name;
-  851                                               i: CARDINAL;
-  852                                               isV: BOOLEAN; .)
-  853      =                                   (. isV := FALSE; .)
-  854        [ "VAR"                           (. isV := TRUE; .) ]
-  855        ParIdents<isV> ":" Type<t, TRUE>  (. i := 0;
-  856                                             WHILE i < SymTab.PendCount() DO
-  857                                               SymTab.PendName(i, nm);
-  858                                               (* value open arrays are
-  859                                                  passed as descriptor
-  860                                                  addresses (no copy):
-  861                                                  same representation as
-  862                                                  VAR formals *)
-  863                                               IF NOT QbeGen.FuncParam(nm,
-  864                                                    isV
-  865                                                    OR SymTab.IsOpenArray(t),
-  866                                                    t) THEN
-  867                                                 SemError(233) END;
-  868                                               INC(i)
-  869                                             END;
-  870                                             IF NOT SymTab.FixPending(t) THEN
-  871                                               SemError(235) END; .) .
-  872    (* Nested procedures lower like top-level ones (4.2): the
-  873       static link gives them their parent's frame. Methods keep
-  874       parse-now/230-later. *)
-  875    ProcDecl                              (. VAR pn: SymTab.Name; .)
-  876      = ProcHeading<pn, SymTab.InvalidType> ";"
-  877        ( "FORWARD"                       (. SymTab.MarkFwd;
-  878                                             SymTab.CloseProc;
-  879                                             QbeGen.AbortFunc; .)
-  880        | "EXTERNAL"                      (. SymTab.MarkExternal("");
-  881                                             SymTab.CloseProc;
-  882                                             QbeGen.AbortFunc; .)
-  883        |                                 (. QbeGen.EndFuncHeader; .)
-  884          Block<pn>                       (. SymTab.CloseProc;
-  885                                             QbeGen.EndFunc(
-  886                                               SymTab.ProcRes(pn)); .) ) .
-  887    Block<pn: SymTab.Name>                (. VAR m2: SymTab.Name; .)
-  888      = DeclSeq
-  889        [ "BEGIN"
-  890          [ StatSeq ] ]
-  891        "END"
-  892        GetIdent<m2>                      (. IF NOT SymTab.Equal(pn, m2) THEN
-  893                                               SemError(202) END; .) .
-  894    StatSeq
-  895      = Statement { ";" [ Statement ] } .
-  896    (* Trailing/empty statements (`a; ; b`, Coco/R's generated `;;`)
-  897       are accepted: the statement after ';' is optional. *)
-  898    Statement                             (. VAR lx: QbeGen.QVal; .)
-  899      = AssOrCall
-  900      | IfStat
-  901      | WhileStat
-  902      | RepeatStat
-  903      | LoopStat
-  904      | ForStat
-  905      | CaseStat
-  906      | WithStat
-  907      | ReturnStat
-  908      | HaltStat
-  909      | NewStat
-  910      | DisposeStat
-  911      | IncDecStat
-  912      | InclExclStat
-  913      | "EXIT"                            (. IF QbeGen.TopLoop(lx) THEN
-  914                                               QbeGen.Jmp(lx)
-  915                                             ELSE SemError(230) END; .) .
-  916    (* INCL(set, elem) / EXCL(set, elem): PIM set-element builtins. *)
-  917    InclExclStat                          (. VAR at, et2: SymTab.TypeIndex;
-  918                                               dk: INTEGER;
-  919                                               qd, qe: QbeGen.QVal;
-  920                                               qn: SymTab.Name;
-  921                                               sfx, isInc: BOOLEAN; .)
-  922      = ( "INCL"                          (. isInc := TRUE; .)
-  923        | "EXCL"                          (. isInc := FALSE; .) )
-  924        "(" Design<at, dk, qd, qn, sfx> ","
-  925        Expr<et2, qe> ")"
-  926                                          (. IF at = SymTab.InvalidType THEN
-  927                                             ELSIF SymTab.ClassOf(at) #
-  928                                                   SymTab.ClSet THEN
-  929                                               SemError(222)
-  930                                             ELSE
-  931                                               IF isInc THEN
-  932                                                 QbeGen.SetBit(qd, qe,
-  933                                                   SymTab.SetBaseLo(at),
-  934                                                   SymTab.SetCount(at))
-  935                                               ELSE
-  936                                                 QbeGen.SetClearBit(qd, qe,
-  937                                                   SymTab.SetBaseLo(at),
-  938                                                   SymTab.SetCount(at))
-  939                                               END
-  940                                             END; .) .
-  941    (* INC(v [,step]) / DEC(v [,step]) as builtin statements over an
-  942       integer designator. *)
-  943    IncDecStat                            (. VAR dt, et2: SymTab.TypeIndex;
-  944                                               dk: INTEGER;
-  945                                               qd, qv, qn2, qstep:
-  946                                                 QbeGen.QVal;
-  947                                               qn: SymTab.Name;
-  948                                               sfx, isInc: BOOLEAN; .)
-  949      =                                   (. isInc := TRUE; .)
-  950        ( "INC"                           (. isInc := TRUE; .)
-  951        | "DEC"                           (. isInc := FALSE; .) )
-  952        "("                               (. QbeGen.CopyOp("1", qstep); .)
-  953        Design<dt, dk, qd, qn, sfx>
-  954        [ "," Expr<et2, qstep> ]
-  955        ")"                               (. IF dt = SymTab.InvalidType THEN
-  956                                             ELSIF (dk # SymTab.KindVar)
-  957   AND (dk # SymTab.KindParam)
-  958   AND (dk # SymTab.KindField) THEN
-  959                                               SemError(210)
-  960                                             ELSIF NOT SymTab.IsIntFamily(dt) THEN
-  961                                               SemError(211)
+  661        |                                 (. IF NOT SymTab.FieldPending(ct,
+  662                                               n) THEN
+  663                                               SemError(200) END; .)
+  664          { "," GetIdent<n>               (. IF NOT SymTab.FieldPending(ct,
+  665                                               n) THEN
+  666                                               SemError(200) END; .) }
+  667          ":" Type<t, FALSE>              (. SymTab.FixPendingF(ct, t); .) ) .
+  668    MethodHeading<VAR pn: SymTab.Name; ct: SymTab.TypeIndex>
+  669                                          (. VAR wantVirt: BOOLEAN; .)
+  670      =                                   (. wantVirt := FALSE; .)
+  671        [ "VIRTUAL"                       (. wantVirt := TRUE; .) ]
+  672        ProcHeading<pn, ct>               (. IF wantVirt THEN
+  673                                               SymTab.MarkVirtual END; .) .
+  674    ClassImplRest                         (. VAR cn, m2: SymTab.Name;
+  675                                               ct: SymTab.TypeIndex; .)
+  676      = GetIdent<cn>                      (. IF NOT SymTab.Lookup(cn) THEN
+  677                                               SemError(201);
+  678                                               ct := SymTab.InvalidType
+  679                                             ELSE ct := SymTab.SymType(cn);
+  680                                               IF SymTab.ClassOf(ct) #
+  681                                                  SymTab.ClClass THEN
+  682                                                 SemError(230);
+  683                                                 ct := SymTab.InvalidType
+  684                                               END
+  685                                             END;
+  686                                             IF ct #
+  687                                                SymTab.InvalidType THEN
+  688                                               IF NOT SymTab.PushClassMembers(
+  689                                                      ct) THEN
+  690                                                 SemError(230) END;
+  691                                               SymTab.PushImplClass(ct)
+  692                                             END; .)
+  693        ";" { MethodImpl<ct> ";" }
+  694        [ "BEGIN"                         (. QbeGen.BeginInit(cn); .)
+  695          [ StatSeq ]                     (. QbeGen.EndInit; .) ]
+  696        "END"
+  697        GetIdent<m2>                      (. IF NOT SymTab.Equal(cn, m2) THEN
+  698                                               SemError(202) END;
+  699                                             SymTab.PopImplClass;
+  700                                             SymTab.PopScope; .) .
+  701    MethodImpl<ct: SymTab.TypeIndex>      (. VAR pn: SymTab.Name;
+  702                                               thisQ: QbeGen.QVal;
+  703                                               methRes: SymTab.TypeIndex; .)
+  704      = MethodHeading<pn, ct> ";"
+  705                                          (. IF (ct #
+  706                                                SymTab.InvalidType)
+  707   AND NOT SymTab.MethodExists(ct,
+  708                                                    pn) THEN
+  709                                               SemError(201) END; .)
+  710        ( "FORWARD"                       (. SymTab.MarkFwd;
+  711                                             QbeGen.AbortFunc;
+  712                                             SymTab.CloseProc; .)
+  713        |                                 (. QbeGen.EndFuncHeader;
+  714                                             (* bind the receiver: bare
+  715                                                field names resolve
+  716                                                against THIS *)
+  717                                             QbeGen.ThisBase(thisQ);
+  718                                             QbeGen.PushWith(thisQ); .)
+  719          Block<pn>                       (. QbeGen.PopWith;
+  720                                             methRes := SymTab.CurRes();
+  721                                             SymTab.CloseProc;
+  722                                             QbeGen.EndFunc(methRes); .) ) .
+  723    ConstBlock
+  724      = "CONST" { ConstDecl ";" } .
+  725    ConstDecl                             (. VAR n: SymTab.Name;
+  726                                               t: SymTab.TypeIndex;
+  727                                               qv: QbeGen.QVal;
+  728                                               cls: INTEGER; .)
+  729      = GetIdent<n>                       (. IF NOT SymTab.Enter(n,
+  730                                               SymTab.KindConst) THEN
+  731                                               SemError(200) END; .)
+  732        "="
+  733        Expr<t, qv>                       (. SymTab.SetSymType(n, t);
+  734                                             cls := SymTab.ClassOf(t);
+  735                                             IF (cls = SymTab.ClArray)
+  736                                                OR (cls = SymTab.ClRecord)
+  737                                                OR (cls = SymTab.ClClass)
+  738                                                OR (cls = SymTab.ClStr)
+  739                                                OR (cls = SymTab.ClUStr) THEN
+  740                                               (* an aggregate/string
+  741                                                  constant: qv is its
+  742                                                  descriptor address; no
+  743                                                  scalar data *)
+  744                                               SymTab.SetSymVal(n, qv)
+  745                                             ELSIF NOT QbeGen.IsImm(qv) THEN
+  746                                               SemError(230)
+  747                                             ELSE
+  748                                               SymTab.SetSymVal(n, qv);
+  749                                               QbeGen.DeclConst(n, qv, t)
+  750                                             END; .) .
+  751    VarBlock
+  752      = "VAR" { VarDecl ";" } .
+  753    VarDecl                               (. VAR nm: SymTab.Name;
+  754                                               t: SymTab.TypeIndex;
+  755                                               i: CARDINAL;
+  756                                               cls: INTEGER; .)
+  757      = VarIdents ":"
+  758        Type<t, FALSE>                    (. cls := SymTab.ClassOf(t);
+  759                                             IF (t # SymTab.InvalidType)
+  760   AND NOT SymTab.IsUnresolved(t)
+  761   AND (cls # SymTab.ClInt)
+  762   AND (cls # SymTab.ClBool)
+  763   AND (cls # SymTab.ClChar)
+  764   AND (cls # SymTab.ClReal)
+  765   AND (cls # SymTab.ClArray)
+  766   AND (cls # SymTab.ClSet)
+  767   AND (cls # SymTab.ClRecord)
+  768   AND (cls # SymTab.ClPtr)
+  769   AND (cls # SymTab.ClLong)
+  770   AND (cls # SymTab.ClProc)
+  771   AND (cls # SymTab.ClUChar)
+  772   AND (cls # SymTab.ClUStr)
+  773   AND (cls # SymTab.ClEnum)
+  774   AND (cls # SymTab.ClClass) THEN
+  775                                               SemError(230) END;
+  776                                             IF QbeGen.LocFull() THEN
+  777                                               SemError(233) END;
+  778                                             i := 0;
+  779                                             IF SymTab.IsUnresolved(t)
+  780                                                AND NOT SymTab.InProc() THEN
+  781                                               (* a forward-typed global:
+  782                                                  defer emission until the
+  783                                                  TYPE block completes *)
+  784                                               WHILE i < SymTab.PendCount() DO
+  785                                                 SymTab.PendName(i, nm);
+  786                                                 IF nPendVar <=
+  787                                                    HIGH(pendVarName) THEN
+  788                                                   pendVarName[nPendVar] := nm;
+  789                                                   pendVarT[nPendVar] := t;
+  790                                                   INC(nPendVar)
+  791                                                 END;
+  792                                                 INC(i)
+  793                                               END
+  794                                             ELSE
+  795                                               WHILE i < SymTab.PendCount() DO
+  796                                                 SymTab.PendName(i, nm);
+  797                                                 QbeGen.DeclVar(nm, t);
+  798                                                 INC(i)
+  799                                               END
+  800                                             END;
+  801                                             (* a plain VAR list, not a
+  802                                                heading: the signature
+  803                                                result is discarded *)
+  804                                             IF NOT SymTab.FixPending(t) THEN
+  805                                             END; .) .
+  806    VarIdents                             (. VAR n: SymTab.Name; .)
+  807      = GetIdent<n>                       (. IF NOT SymTab.EnterPending(n,
+  808                                               SymTab.KindVar) THEN
+  809                                               SemError(200) END; .)
+  810        { ","
+  811          GetIdent<n>                     (. IF NOT SymTab.EnterPending(n,
+  812                                               SymTab.KindVar) THEN
+  813                                               SemError(200) END; .) } .
+  814    ParIdents<isV: BOOLEAN>               (. VAR n: SymTab.Name; .)
+  815      = GetIdent<n>                       (. IF NOT SymTab.EnterParam(n, isV) THEN
+  816                                               SemError(200) END; .)
+  817        { "," GetIdent<n>                 (. IF NOT SymTab.EnterParam(n, isV) THEN
+  818                                               SemError(200) END; .) } .
+  819    (* Procedure headings enter scopes/params/result and buffer the
+  820       QBE header; bodies lower to functions (4.1, module level only).
+  821       FORWARD marks; the body heading re-enters (signature compare
+  822       deferred). Nested procedures parse + check, lowering = 4.2. *)
+  823    ProcHeading<VAR pn: SymTab.Name; methCls: SymTab.TypeIndex>
+  824                                          (. VAR t: SymTab.TypeIndex;
+  825                                               mg: QbeGen.QVal; .)
+  826      = "PROCEDURE"
+  827        GetIdent<pn>                      (. IF methCls #
+  828                                                SymTab.InvalidType THEN
+  829                                             (* a method: resume the
+  830                                                declared symbol (reuse
+  831                                                its uid) *)
+  832                                             IF NOT SymTab.ResumeMethod(
+  833                                                  methCls, pn) THEN
+  834                                               SemError(200) END
+  835                                             ELSIF NOT SymTab.EnterProc(pn) THEN
+  836                                             IF NOT SymTab.ReenterProc(pn) THEN
+  837                                               IF NOT SymTab.ResumeProc(pn) THEN
+  838                                                 SemError(200) END
+  839                                               END
+  840                                             END;
+  841                                             IF methCls #
+  842                                                SymTab.InvalidType THEN
+  843                                               QbeGen.Mangled(pn,
+  844                                                 SymTab.MethUid(), mg)
+  845                                             ELSE
+  846                                               QbeGen.Mangled(pn,
+  847                                                 SymTab.ProcUid(pn), mg)
+  848                                             END;
+  849                                             QbeGen.BeginFunc(mg);
+  850                                             IF methCls #
+  851                                                SymTab.InvalidType THEN
+  852                                               (* hidden THIS receiver:
+  853                                                  a VAR param of the
+  854                                                  class type, pushed as
+  855                                                  the WITH base *)
+  856                                               IF NOT SymTab.EnterThisParam(
+  857                                                    methCls) THEN
+  858                                                 SemError(200) END;
+  859                                               IF NOT QbeGen.FuncParam(
+  860                                                    "THIS", TRUE,
+  861                                                    methCls) THEN
+  862                                                 SemError(233) END
+  863                                             END; .)
+  864        [ FormalParams ]
+  865        [ ":" TypeIdent<t>                (. IF NOT SymTab.SetProcRes(t) THEN
+  866                                               SemError(235) END;
+  867                                             QbeGen.SetFuncRes(t);
+  868                                             IF (t #
+  869                                                SymTab.InvalidType)
+  870   AND ((SymTab.ClassOf(t)
+  871                                                   = SymTab.ClArray)
+  872                                                OR (SymTab.ClassOf(t)
+  873                                                   = SymTab.ClRecord)
+  874                                                OR (SymTab.ClassOf(t)
+  875                                                   = SymTab.ClSet)
+  876                                                OR (SymTab.ClassOf(t)
+  877                                                   = SymTab.ClClass)) THEN
+  878                                               SemError(230) END; .) ] .
+  879    FormalParams
+  880      = "(" [ ParamSection { ";" ParamSection } ] ")" .
+  881    ParamSection                          (. VAR t: SymTab.TypeIndex;
+  882                                               nm: SymTab.Name;
+  883                                               i: CARDINAL;
+  884                                               isV: BOOLEAN; .)
+  885      =                                   (. isV := FALSE; .)
+  886        [ "VAR"                           (. isV := TRUE; .) ]
+  887        ParIdents<isV> ":" Type<t, TRUE>  (. i := 0;
+  888                                             WHILE i < SymTab.PendCount() DO
+  889                                               SymTab.PendName(i, nm);
+  890                                               (* value open arrays are
+  891                                                  passed as descriptor
+  892                                                  addresses (no copy):
+  893                                                  same representation as
+  894                                                  VAR formals *)
+  895                                               IF NOT QbeGen.FuncParam(nm,
+  896                                                    isV
+  897                                                    OR SymTab.IsOpenArray(t),
+  898                                                    t) THEN
+  899                                                 SemError(233) END;
+  900                                               INC(i)
+  901                                             END;
+  902                                             IF NOT SymTab.FixPending(t) THEN
+  903                                               SemError(235) END; .) .
+  904    (* Nested procedures lower like top-level ones (4.2): the
+  905       static link gives them their parent's frame. Methods keep
+  906       parse-now/230-later. *)
+  907    ProcDecl                              (. VAR pn: SymTab.Name; .)
+  908      = ProcHeading<pn, SymTab.InvalidType> ";"
+  909        ( "FORWARD"                       (. SymTab.MarkFwd;
+  910                                             SymTab.CloseProc;
+  911                                             QbeGen.AbortFunc; .)
+  912        | "EXTERNAL"                      (. SymTab.MarkExternal("");
+  913                                             SymTab.CloseProc;
+  914                                             QbeGen.AbortFunc; .)
+  915        |                                 (. QbeGen.EndFuncHeader; .)
+  916          Block<pn>                       (. SymTab.CloseProc;
+  917                                             QbeGen.EndFunc(
+  918                                               SymTab.ProcRes(pn)); .) ) .
+  919    Block<pn: SymTab.Name>                (. VAR m2: SymTab.Name; .)
+  920      = DeclSeq
+  921        [ "BEGIN"
+  922          [ StatSeq ] ]
+  923        "END"
+  924        GetIdent<m2>                      (. IF NOT SymTab.Equal(pn, m2) THEN
+  925                                               SemError(202) END; .) .
+  926    StatSeq
+  927      = Statement { ";" [ Statement ] } .
+  928    (* Trailing/empty statements (`a; ; b`, Coco/R's generated `;;`)
+  929       are accepted: the statement after ';' is optional. *)
+  930    Statement                             (. VAR lx: QbeGen.QVal; .)
+  931      = AssOrCall
+  932      | IfStat
+  933      | WhileStat
+  934      | RepeatStat
+  935      | LoopStat
+  936      | ForStat
+  937      | CaseStat
+  938      | WithStat
+  939      | ReturnStat
+  940      | HaltStat
+  941      | NewStat
+  942      | DisposeStat
+  943      | IncDecStat
+  944      | InclExclStat
+  945      | "EXIT"                            (. IF QbeGen.TopLoop(lx) THEN
+  946                                               QbeGen.Jmp(lx)
+  947                                             ELSE SemError(230) END; .) .
+  948    (* INCL(set, elem) / EXCL(set, elem): PIM set-element builtins. *)
+  949    InclExclStat                          (. VAR at, et2: SymTab.TypeIndex;
+  950                                               dk: INTEGER;
+  951                                               qd, qe: QbeGen.QVal;
+  952                                               qn: SymTab.Name;
+  953                                               sfx, isInc: BOOLEAN; .)
+  954      = ( "INCL"                          (. isInc := TRUE; .)
+  955        | "EXCL"                          (. isInc := FALSE; .) )
+  956        "(" Design<at, dk, qd, qn, sfx> ","
+  957        Expr<et2, qe> ")"
+  958                                          (. IF at = SymTab.InvalidType THEN
+  959                                             ELSIF SymTab.ClassOf(at) #
+  960                                                   SymTab.ClSet THEN
+  961                                               SemError(222)
   962                                             ELSE
-  963                                               IF sfx
-  964                                                  OR (dk = SymTab.KindField) THEN
-  965                                                 QbeGen.ElemLoad(qd, dt, qv)
-  966                                               ELSE QbeGen.LoadVar(qn,
-  967                                                 FALSE, qv)
-  968                                               END;
-  969                                               QbeGen.NewTemp(qn2);
-  970                                               IF isInc THEN
-  971                                                 QbeGen.Op3("add", qn2, qv,
-  972                                                   qstep, FALSE)
-  973                                               ELSE QbeGen.Op3("sub", qn2, qv,
-  974                                                   qstep, FALSE)
-  975                                               END;
-  976                                               IF sfx
-  977                                                  OR (dk = SymTab.KindField) THEN
-  978                                                 QbeGen.ElemStore(qd, qn2,
-  979                                                   dt)
-  980                                               ELSE QbeGen.StoreVar(qn,
-  981                                                 qn2, FALSE)
-  982                                               END
-  983                                             END; .) .
-  984    (* NEW/DISPOSE as builtin statements (no call syntax until step 4).
-  985       Targets are pointer designators; DISPOSE nils afterwards (safer
-  986       than Wirth-undefined; documented). DISPOSE is shallow. *)
-  987    NewStat                               (. VAR dt: SymTab.TypeIndex;
-  988                                               dk: INTEGER;
-  989                                               qd, qm: QbeGen.QVal;
-  990                                               qn: SymTab.Name;
-  991                                               sfx: BOOLEAN;
-  992                                               bt: SymTab.TypeIndex; .)
-  993      = "NEW" "(" Design<dt, dk, qd, qn, sfx> ")"
-  994                                          (. IF dt = SymTab.InvalidType THEN
-  995                                             ELSIF (dk # SymTab.KindVar)
-  996   AND (dk # SymTab.KindParam)
-  997   AND (dk # SymTab.KindField) THEN
-  998                                               SemError(210)
-  999                                             ELSIF SymTab.ClassOf(dt) #
- 1000                                                   SymTab.ClPtr THEN
- 1001                                               SemError(219)
- 1002                                             ELSE bt := SymTab.PtrBase(dt);
- 1003                                               IF bt #
- 1004                                                  SymTab.InvalidType THEN
- 1005                                                 QbeGen.NewHeap(bt, qm);
- 1006                                                 QbeGen.InitHeap(qm, bt);
- 1007                                                 IF sfx
- 1008                                                    OR (dk =
- 1009                                                       SymTab.KindField) THEN
- 1010                                                   QbeGen.ElemStore(qd, qm,
- 1011                                                     dt)
- 1012                                                 ELSE QbeGen.StorePtr(qn,
- 1013                                                   qm)
- 1014                                                 END
- 1015                                               END
- 1016                                             END; .) .
- 1017    DisposeStat                           (. VAR dt: SymTab.TypeIndex;
- 1018                                               dk: INTEGER;
- 1019                                               qd, qv: QbeGen.QVal;
- 1020                                               qn: SymTab.Name;
- 1021                                               sfx: BOOLEAN; .)
- 1022      = "DISPOSE" "(" Design<dt, dk, qd, qn, sfx> ")"
- 1023                                          (. IF dt = SymTab.InvalidType THEN
- 1024                                             ELSIF (dk # SymTab.KindVar)
- 1025   AND (dk # SymTab.KindParam)
- 1026   AND (dk # SymTab.KindField) THEN
- 1027                                               SemError(210)
- 1028                                             ELSIF SymTab.ClassOf(dt) #
- 1029                                                   SymTab.ClPtr THEN
- 1030                                               SemError(219)
- 1031                                             ELSE
- 1032                                               IF sfx
- 1033                                                  OR (dk =
- 1034                                                     SymTab.KindField) THEN
- 1035                                                 QbeGen.ElemLoad(qd, dt,
- 1036                                                   qv)
- 1037                                               ELSE QbeGen.LoadPtr(qn, qv)
- 1038                                               END;
- 1039                                               QbeGen.FreeHeap(qv);
- 1040                                               IF sfx
- 1041                                                  OR (dk =
- 1042                                                     SymTab.KindField) THEN
- 1043                                                 QbeGen.ElemStore(qd, "0",
- 1044                                                   dt)
- 1045                                               ELSE QbeGen.StorePtr(qn,
- 1046                                                 "0")
+  963                                               IF isInc THEN
+  964                                                 QbeGen.SetBit(qd, qe,
+  965                                                   SymTab.SetBaseLo(at),
+  966                                                   SymTab.SetCount(at))
+  967                                               ELSE
+  968                                                 QbeGen.SetClearBit(qd, qe,
+  969                                                   SymTab.SetBaseLo(at),
+  970                                                   SymTab.SetCount(at))
+  971                                               END
+  972                                             END; .) .
+  973    (* INC(v [,step]) / DEC(v [,step]) as builtin statements over an
+  974       integer designator. *)
+  975    IncDecStat                            (. VAR dt, et2: SymTab.TypeIndex;
+  976                                               dk: INTEGER;
+  977                                               qd, qv, qn2, qstep:
+  978                                                 QbeGen.QVal;
+  979                                               qn: SymTab.Name;
+  980                                               sfx, isInc: BOOLEAN; .)
+  981      =                                   (. isInc := TRUE; .)
+  982        ( "INC"                           (. isInc := TRUE; .)
+  983        | "DEC"                           (. isInc := FALSE; .) )
+  984        "("                               (. QbeGen.CopyOp("1", qstep); .)
+  985        Design<dt, dk, qd, qn, sfx>
+  986        [ "," Expr<et2, qstep> ]
+  987        ")"                               (. IF dt = SymTab.InvalidType THEN
+  988                                             ELSIF (dk # SymTab.KindVar)
+  989   AND (dk # SymTab.KindParam)
+  990   AND (dk # SymTab.KindField) THEN
+  991                                               SemError(210)
+  992                                             ELSIF NOT SymTab.IsIntFamily(dt) THEN
+  993                                               SemError(211)
+  994                                             ELSE
+  995                                               IF sfx
+  996                                                  OR (dk = SymTab.KindField) THEN
+  997                                                 QbeGen.ElemLoad(qd, dt, qv)
+  998                                               ELSE QbeGen.LoadVar(qn,
+  999                                                 FALSE, qv)
+ 1000                                               END;
+ 1001                                               QbeGen.NewTemp(qn2);
+ 1002                                               IF isInc THEN
+ 1003                                                 QbeGen.Op3("add", qn2, qv,
+ 1004                                                   qstep, FALSE)
+ 1005                                               ELSE QbeGen.Op3("sub", qn2, qv,
+ 1006                                                   qstep, FALSE)
+ 1007                                               END;
+ 1008                                               IF sfx
+ 1009                                                  OR (dk = SymTab.KindField) THEN
+ 1010                                                 QbeGen.ElemStore(qd, qn2,
+ 1011                                                   dt)
+ 1012                                               ELSE QbeGen.StoreVar(qn,
+ 1013                                                 qn2, FALSE)
+ 1014                                               END
+ 1015                                             END; .) .
+ 1016    (* NEW/DISPOSE as builtin statements (no call syntax until step 4).
+ 1017       Targets are pointer designators; DISPOSE nils afterwards (safer
+ 1018       than Wirth-undefined; documented). DISPOSE is shallow. *)
+ 1019    NewStat                               (. VAR dt: SymTab.TypeIndex;
+ 1020                                               dk: INTEGER;
+ 1021                                               qd, qm: QbeGen.QVal;
+ 1022                                               qn: SymTab.Name;
+ 1023                                               sfx: BOOLEAN;
+ 1024                                               bt: SymTab.TypeIndex; .)
+ 1025      = "NEW" "(" Design<dt, dk, qd, qn, sfx> ")"
+ 1026                                          (. IF dt = SymTab.InvalidType THEN
+ 1027                                             ELSIF (dk # SymTab.KindVar)
+ 1028   AND (dk # SymTab.KindParam)
+ 1029   AND (dk # SymTab.KindField) THEN
+ 1030                                               SemError(210)
+ 1031                                             ELSIF SymTab.ClassOf(dt) #
+ 1032                                                   SymTab.ClPtr THEN
+ 1033                                               SemError(219)
+ 1034                                             ELSE bt := SymTab.PtrBase(dt);
+ 1035                                               IF bt #
+ 1036                                                  SymTab.InvalidType THEN
+ 1037                                                 QbeGen.NewHeap(bt, qm);
+ 1038                                                 QbeGen.InitHeap(qm, bt);
+ 1039                                                 IF sfx
+ 1040                                                    OR (dk =
+ 1041                                                       SymTab.KindField) THEN
+ 1042                                                   QbeGen.ElemStore(qd, qm,
+ 1043                                                     dt)
+ 1044                                                 ELSE QbeGen.StorePtr(qn,
+ 1045                                                   qm)
+ 1046                                                 END
  1047                                               END
  1048                                             END; .) .
- 1049    (* WITH pushes each record's fields (inner wins) plus its base
- 1050       address; field designators resolve through both stacks. *)
- 1051    WithStat                              (. VAR nW: CARDINAL; .)
- 1052      = "WITH"                            (. nW := 0; .)
- 1053        WithItem<nW> { "," WithItem<nW> }
- 1054        "DO" [ StatSeq ] "END"
- 1055                                          (. WHILE nW > 0 DO
- 1056                                               SymTab.PopScope;
- 1057                                               QbeGen.PopWith;
- 1058                                               DEC(nW)
- 1059                                             END; .) .
- 1060    WithItem<VAR nW: CARDINAL>            (. VAR dt: SymTab.TypeIndex;
- 1061                                               dk: INTEGER;
- 1062                                               qd, qe: QbeGen.QVal;
- 1063                                               qn: SymTab.Name;
- 1064                                               sfx: BOOLEAN; .)
- 1065      = Design<dt, dk, qd, qn, sfx>
- 1066                                          (. IF dt = SymTab.InvalidType THEN
- 1067                                             ELSIF (SymTab.ClassOf(dt) #
- 1068                                                    SymTab.ClRecord)
- 1069   AND (SymTab.ClassOf(dt) #
- 1070                                                   SymTab.ClClass) THEN
- 1071                                               SemError(215)
- 1072                                             ELSIF SymTab.PushRecord(dt) THEN
- 1073                                               QbeGen.PushWith(qd);
- 1074                                               INC(nW)
- 1075                                             END; .) .
- 1076    (* Assignment or procedure-statement call (4.1, module level).
- 1077       Bare `P;` is a syntax error; function-as-statement is 233. *)
- 1078    AssOrCall                             (. VAR dt, et: SymTab.TypeIndex;
- 1079                                               dk: INTEGER;
- 1080                                               qd, qe, qt, ql: QbeGen.QVal;
- 1081                                               qn: SymTab.Name;
- 1082                                               ct2, res0: SymTab.TypeIndex;
- 1083                                               q2, mg0: QbeGen.QVal;
- 1084                                               isR, conv, wconv: BOOLEAN;
- 1085                                               called, sfx: BOOLEAN; .)
- 1086      = Design<dt, dk, qd, qn, sfx>
- 1087        ( ":="
- 1088          Expr<et, qe>                    (. IF (dt # SymTab.InvalidType)
- 1089   AND (dk # SymTab.KindVar)
- 1090   AND (dk # SymTab.KindParam)
- 1091   AND (dk # SymTab.KindField) THEN
- 1092                                             SemError(210)
- 1093                                           ELSIF NOT SymTab.Assignable(et,
- 1094                                                    dt) THEN
- 1095                                             SemError(210)
- 1096                                           ELSIF (dt # SymTab.InvalidType)
- 1097   AND (SymTab.ClassOf(dt) =
- 1098                                                 SymTab.ClClass) THEN
- 1099                                             SemError(230) END;
- 1100                                           isR := (dt #
- 1101                                                   SymTab.InvalidType)
- 1102   AND (SymTab.ClassOf(dt)
- 1103                                                     = SymTab.ClReal);
- 1104                                           conv := isR
- 1105   AND SymTab.IsIntFamily(et);
- 1106                                           wconv := (dt #
- 1107                                                     SymTab.InvalidType)
- 1108   AND SymTab.IsLongFamily(dt)
- 1109   AND SymTab.IsIntFamily(et);
- 1110                                           IF ((dk = SymTab.KindVar)
- 1111                                               OR (dk = SymTab.KindParam)
- 1112                                               OR (dk = SymTab.KindField))
- 1113   AND (dt # SymTab.InvalidType)
- 1114   AND (et # SymTab.InvalidType)
- 1115   AND (SymTab.ClassOf(dt) #
- 1116                                                 SymTab.ClClass) THEN
- 1117                                             IF sfx
- 1118                                                OR (dk = SymTab.KindField) THEN
- 1119                                               IF SymTab.ClassOf(dt) =
- 1120                                                  SymTab.ClArray THEN
- 1121                                                 IF (et # SymTab.InvalidType)
- 1122    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
- 1123    AND SymTab.IsUCharArray(dt) THEN
- 1124                                                   QbeGen.UAssign(qd, qe)
- 1125                                                 ELSIF SymTab.StrCompat(dt,
- 1126                                                      et) THEN
- 1127                                                   QbeGen.StrAssign(qd,
- 1128                                                     qe)
- 1129                                                 ELSE
- 1130                                                   QbeGen.CopyArray(qd,
- 1131                                                     qe, dt)
- 1132                                                 END
- 1133                                               ELSIF SymTab.ClassOf(dt) =
- 1134                                                   SymTab.ClSet THEN
- 1135                                                 QbeGen.CopySet(qd, qe,
- 1136                                                   SymTab.SetWords(dt),
- 1137                                                   SymTab.SetWords(et))
- 1138                                               ELSIF SymTab.ClassOf(dt) =
- 1139                                                   SymTab.ClRecord THEN
- 1140                                                 QbeGen.CopyRecord(qd, qe,
- 1141                                                   dt)
- 1142                                               ELSIF SymTab.IsLongFamily(dt) THEN
- 1143                                                 IF wconv THEN
- 1144                                                   QbeGen.WidenLong(qe, ql);
- 1145                                                   QbeGen.ElemStore(qd, ql,
- 1146                                                     dt)
- 1147                                                 ELSE QbeGen.ElemStore(qd, qe,
- 1148                                                   dt)
- 1149                                                 END
- 1150                                               ELSIF conv THEN
- 1151                                                 QbeGen.ConvIR(qe, qt);
- 1152                                                 QbeGen.ElemStore(qd, qt,
- 1153                                                   dt)
- 1154                                               ELSE QbeGen.ElemStore(qd, qe,
- 1155                                                 dt)
- 1156                                               END
- 1157                                             ELSIF SymTab.ClassOf(dt) =
- 1158                                                   SymTab.ClArray THEN
- 1159                                               IF (et # SymTab.InvalidType)
- 1160    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
- 1161    AND SymTab.IsUCharArray(dt) THEN
- 1162                                                 QbeGen.UAssign(qd, qe)
- 1163                                               ELSIF SymTab.StrCompat(dt,
- 1164                                                    et) THEN
- 1165                                                 QbeGen.StrAssign(qd, qe)
- 1166                                               ELSE
- 1167                                                 QbeGen.CopyArray(qd, qe,
- 1168                                                   dt)
- 1169                                               END
- 1170                                             ELSIF SymTab.ClassOf(dt) =
- 1171                                                   SymTab.ClSet THEN
- 1172                                               QbeGen.CopySet(qd, qe,
- 1173                                                 SymTab.SetWords(dt),
- 1174                                                 SymTab.SetWords(et))
- 1175                                             ELSIF SymTab.ClassOf(dt) =
- 1176                                                   SymTab.ClRecord THEN
- 1177                                               QbeGen.CopyRecord(qd, qe, dt)
- 1178                                             ELSIF (SymTab.ClassOf(dt) =
- 1179                                                   SymTab.ClPtr)
- 1180                                                OR (SymTab.ClassOf(dt) =
- 1181                                                   SymTab.ClProc) THEN
- 1182                                               QbeGen.StorePtr(qn, qe)
- 1183                                             ELSIF SymTab.IsLongFamily(dt) THEN
- 1184                                               IF wconv THEN
- 1185                                                 QbeGen.WidenLong(qe, ql);
- 1186                                                 QbeGen.StoreLong(qn, ql)
- 1187                                               ELSE QbeGen.StoreLong(qn, qe)
+ 1049    DisposeStat                           (. VAR dt: SymTab.TypeIndex;
+ 1050                                               dk: INTEGER;
+ 1051                                               qd, qv: QbeGen.QVal;
+ 1052                                               qn: SymTab.Name;
+ 1053                                               sfx: BOOLEAN; .)
+ 1054      = "DISPOSE" "(" Design<dt, dk, qd, qn, sfx> ")"
+ 1055                                          (. IF dt = SymTab.InvalidType THEN
+ 1056                                             ELSIF (dk # SymTab.KindVar)
+ 1057   AND (dk # SymTab.KindParam)
+ 1058   AND (dk # SymTab.KindField) THEN
+ 1059                                               SemError(210)
+ 1060                                             ELSIF SymTab.ClassOf(dt) #
+ 1061                                                   SymTab.ClPtr THEN
+ 1062                                               SemError(219)
+ 1063                                             ELSE
+ 1064                                               IF sfx
+ 1065                                                  OR (dk =
+ 1066                                                     SymTab.KindField) THEN
+ 1067                                                 QbeGen.ElemLoad(qd, dt,
+ 1068                                                   qv)
+ 1069                                               ELSE QbeGen.LoadPtr(qn, qv)
+ 1070                                               END;
+ 1071                                               QbeGen.FreeHeap(qv);
+ 1072                                               IF sfx
+ 1073                                                  OR (dk =
+ 1074                                                     SymTab.KindField) THEN
+ 1075                                                 QbeGen.ElemStore(qd, "0",
+ 1076                                                   dt)
+ 1077                                               ELSE QbeGen.StorePtr(qn,
+ 1078                                                 "0")
+ 1079                                               END
+ 1080                                             END; .) .
+ 1081    (* WITH pushes each record's fields (inner wins) plus its base
+ 1082       address; field designators resolve through both stacks. *)
+ 1083    WithStat                              (. VAR nW: CARDINAL; .)
+ 1084      = "WITH"                            (. nW := 0; .)
+ 1085        WithItem<nW> { "," WithItem<nW> }
+ 1086        "DO" [ StatSeq ] "END"
+ 1087                                          (. WHILE nW > 0 DO
+ 1088                                               SymTab.PopScope;
+ 1089                                               QbeGen.PopWith;
+ 1090                                               DEC(nW)
+ 1091                                             END; .) .
+ 1092    WithItem<VAR nW: CARDINAL>            (. VAR dt: SymTab.TypeIndex;
+ 1093                                               dk: INTEGER;
+ 1094                                               qd, qe: QbeGen.QVal;
+ 1095                                               qn: SymTab.Name;
+ 1096                                               sfx: BOOLEAN; .)
+ 1097      = Design<dt, dk, qd, qn, sfx>
+ 1098                                          (. IF dt = SymTab.InvalidType THEN
+ 1099                                             ELSIF (SymTab.ClassOf(dt) #
+ 1100                                                    SymTab.ClRecord)
+ 1101   AND (SymTab.ClassOf(dt) #
+ 1102                                                   SymTab.ClClass) THEN
+ 1103                                               SemError(215)
+ 1104                                             ELSIF SymTab.PushRecord(dt) THEN
+ 1105                                               QbeGen.PushWith(qd);
+ 1106                                               INC(nW)
+ 1107                                             END; .) .
+ 1108    (* Assignment or procedure-statement call (4.1, module level).
+ 1109       Bare `P;` is a syntax error; function-as-statement is 233. *)
+ 1110    AssOrCall                             (. VAR dt, et: SymTab.TypeIndex;
+ 1111                                               dk: INTEGER;
+ 1112                                               qd, qe, qt, ql: QbeGen.QVal;
+ 1113                                               qn: SymTab.Name;
+ 1114                                               ct2, res0: SymTab.TypeIndex;
+ 1115                                               q2, mg0: QbeGen.QVal;
+ 1116                                               isR, conv, wconv: BOOLEAN;
+ 1117                                               called, sfx: BOOLEAN; .)
+ 1118      = Design<dt, dk, qd, qn, sfx>
+ 1119        ( ":="
+ 1120          Expr<et, qe>                    (. IF (dt # SymTab.InvalidType)
+ 1121   AND (dk # SymTab.KindVar)
+ 1122   AND (dk # SymTab.KindParam)
+ 1123   AND (dk # SymTab.KindField) THEN
+ 1124                                             SemError(210)
+ 1125                                           ELSIF NOT SymTab.Assignable(et,
+ 1126                                                    dt) THEN
+ 1127                                             SemError(210)
+ 1128                                           ELSIF (dt # SymTab.InvalidType)
+ 1129   AND (SymTab.ClassOf(dt) =
+ 1130                                                 SymTab.ClClass) THEN
+ 1131                                             SemError(230) END;
+ 1132                                           isR := (dt #
+ 1133                                                   SymTab.InvalidType)
+ 1134   AND (SymTab.ClassOf(dt)
+ 1135                                                     = SymTab.ClReal);
+ 1136                                           conv := isR
+ 1137   AND SymTab.IsIntFamily(et);
+ 1138                                           wconv := (dt #
+ 1139                                                     SymTab.InvalidType)
+ 1140   AND SymTab.IsLongFamily(dt)
+ 1141   AND SymTab.IsIntFamily(et);
+ 1142                                           IF ((dk = SymTab.KindVar)
+ 1143                                               OR (dk = SymTab.KindParam)
+ 1144                                               OR (dk = SymTab.KindField))
+ 1145   AND (dt # SymTab.InvalidType)
+ 1146   AND (et # SymTab.InvalidType)
+ 1147   AND (SymTab.ClassOf(dt) #
+ 1148                                                 SymTab.ClClass) THEN
+ 1149                                             IF sfx
+ 1150                                                OR (dk = SymTab.KindField) THEN
+ 1151                                               IF SymTab.ClassOf(dt) =
+ 1152                                                  SymTab.ClArray THEN
+ 1153                                                 IF (et # SymTab.InvalidType)
+ 1154    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
+ 1155    AND SymTab.IsUCharArray(dt) THEN
+ 1156                                                   QbeGen.UAssign(qd, qe)
+ 1157                                                 ELSIF SymTab.StrCompat(dt,
+ 1158                                                      et) THEN
+ 1159                                                   QbeGen.StrAssign(qd,
+ 1160                                                     qe)
+ 1161                                                 ELSE
+ 1162                                                   QbeGen.CopyArray(qd,
+ 1163                                                     qe, dt)
+ 1164                                                 END
+ 1165                                               ELSIF SymTab.ClassOf(dt) =
+ 1166                                                   SymTab.ClSet THEN
+ 1167                                                 QbeGen.CopySet(qd, qe,
+ 1168                                                   SymTab.SetWords(dt),
+ 1169                                                   SymTab.SetWords(et))
+ 1170                                               ELSIF SymTab.ClassOf(dt) =
+ 1171                                                   SymTab.ClRecord THEN
+ 1172                                                 QbeGen.CopyRecord(qd, qe,
+ 1173                                                   dt)
+ 1174                                               ELSIF SymTab.IsLongFamily(dt) THEN
+ 1175                                                 IF wconv THEN
+ 1176                                                   QbeGen.WidenLong(qe, ql);
+ 1177                                                   QbeGen.ElemStore(qd, ql,
+ 1178                                                     dt)
+ 1179                                                 ELSE QbeGen.ElemStore(qd, qe,
+ 1180                                                   dt)
+ 1181                                                 END
+ 1182                                               ELSIF conv THEN
+ 1183                                                 QbeGen.ConvIR(qe, qt);
+ 1184                                                 QbeGen.ElemStore(qd, qt,
+ 1185                                                   dt)
+ 1186                                               ELSE QbeGen.ElemStore(qd, qe,
+ 1187                                                 dt)
  1188                                               END
- 1189                                             ELSIF conv THEN
- 1190                                               QbeGen.ConvIR(qe, qt);
- 1191                                               QbeGen.StoreVar(qn, qt, TRUE)
- 1192                                             ELSE
- 1193                                               QbeGen.StoreVar(qn, qe, isR)
- 1194                                             END
- 1195                                           END; .)
- 1196        | ArgList<qn, dt, qd, FALSE, methCls, ct2, q2, called>
- 1197        |                                 (* bare `P;`: proper parameterless
- 1198                                              procedure call; anything else
- 1199                                              here is 233 (was a bare syntax
- 1200                                              error before 4.2) *)
- 1201                                          (. IF (dk = SymTab.KindProc)
- 1202   AND NOT sfx THEN
- 1203                                               res0 := SymTab.ProcRes(qn);
- 1204                                               IF res0 #
- 1205                                                  SymTab.InvalidType THEN
- 1206                                                 SemError(233)
- 1207                                               ELSIF SymTab.ProcNPar(qn) #
- 1208                                                       0 THEN
- 1209                                                 SemError(233)
- 1210                                               ELSE QbeGen.Mangled(qn,
- 1211                                                 SymTab.ProcUid(qn), mg0);
- 1212                                                 QbeGen.CallBegin(mg0,
- 1213                                                   res0,
- 1214                                                   SymTab.ProcDepthOf(qn),
- 1215                                                   SymTab.IsExternal(qn));
- 1216                                                 QbeGen.CallEnd(FALSE, q2)
- 1217                                               END
- 1218                                             ELSE SemError(233)
- 1219                                             END; .) ) .
- 1220    (* Actual-parameter list shared by statement and expression calls.
- 1221       want selects CallEnd's result handling; t/q carry the call
- 1222       value (statement calls discard). Arity/type failures are 233;
- 1223       evaluation code still emits so the .ssa stays assembleable. *)
- 1224    ArgList<pn: SymTab.Name; pt: SymTab.TypeIndex; callee: QbeGen.QVal;
- 1225            want: BOOLEAN; methCls: SymTab.TypeIndex;
- 1226            VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
- 1227            VAR called: BOOLEAN>          (. VAR i, np: CARDINAL;
- 1228                                               vs: INTEGER;
- 1229                                               res: SymTab.TypeIndex;
- 1230                                               mg: QbeGen.QVal;
- 1231                                               ok, ind, isMeth, va: BOOLEAN; .)
- 1232      = "("                               (. called := TRUE;
- 1233                                             ok := TRUE;
- 1234                                             ind := FALSE;
- 1235                                             isMeth := methCls #
- 1236                                               SymTab.InvalidType;
- 1237                                             IF isMeth THEN
- 1238                                               (* class method: the
- 1239                                                  receiver is armed.
- 1240                                                  Virtual -> dispatch
- 1241                                                  through the vtable;
- 1242                                                  otherwise a static
- 1243                                                  call. *)
- 1244                                               res := SymTab.ClassMethodRes(
- 1245                                                 methCls, pn);
- 1246                                               vs := SymTab.VirtSlot(
- 1247                                                 methCls, pn);
- 1248                                               IF vs >= 0 THEN
- 1249                                                 QbeGen.VirtCallBegin(
- 1250                                                   callee, vs, res)
- 1251                                               ELSE
- 1252                                                 QbeGen.Mangled(pn,
- 1253                                                   SymTab.ClassMethodUid(
- 1254                                                   methCls, pn), mg);
- 1255                                                 QbeGen.CallBegin(mg, res, 0,
- 1256                                                   FALSE)
- 1257                                               END
- 1258                                             ELSIF SymTab.SymKind(pn) =
- 1259                                                SymTab.KindProc THEN
- 1260                                               res := SymTab.ProcRes(pn);
- 1261                                               QbeGen.Mangled(pn,
- 1262                                                 SymTab.ProcUid(pn), mg);
- 1263                                               QbeGen.CallBegin(mg, res,
- 1264                                                 SymTab.ProcDepthOf(pn),
- 1265                                                 SymTab.IsExternal(pn))
- 1266                                             ELSIF (pt # SymTab.InvalidType)
- 1267    AND (SymTab.ClassOf(pt) = SymTab.ClProc) THEN
- 1268                                               ind := TRUE;
- 1269                                               res :=
- 1270                                                 SymTab.ProcTypeRes(pt);
- 1271                                               QbeGen.CallBeginInd(callee,
- 1272                                                 res, FALSE)
- 1273                                             ELSE SemError(233);
- 1274                                               ok := FALSE;
- 1275                                               res := SymTab.InvalidType
- 1276                                             END;
- 1277                                             i := 0; .)
- 1278        [ ActParam<pn, pt, ind, methCls, i>        (. INC(i); .)
- 1279          { "," ActParam<pn, pt, ind, methCls, i>  (. INC(i); .) } ]
- 1280        ")"                               (. IF ok THEN
- 1281                                               IF isMeth THEN
- 1282                                                 np := SymTab.ClassMethodNPar(
- 1283                                                   methCls, pn)
- 1284                                               ELSIF ind THEN
- 1285                                                 np := SymTab.ProcTypeNPar(pt)
- 1286                                               ELSE np := SymTab.ProcNPar(pn)
- 1287                                               END;
- 1288                                               va := (NOT isMeth) AND (NOT ind)
- 1289                                                 AND (SymTab.SymKind(pn) =
- 1290                                                      SymTab.KindProc)
- 1291                                                 AND SymTab.Varargs(pn);
- 1292                                               IF (i # np) AND NOT va THEN
- 1293                                                 SemError(233); ok := FALSE
- 1294                                               END
- 1295                                             END;
- 1296                                             IF NOT ok THEN
- 1297                                               t := SymTab.InvalidType;
- 1298                                               QbeGen.CopyOp("0", q)
- 1299                                             ELSIF want THEN
- 1300                                               IF res =
- 1301                                                  SymTab.InvalidType THEN
- 1302                                                 SemError(233);
- 1303                                                 t := SymTab.InvalidType;
- 1304                                                 QbeGen.CopyOp("0", q)
- 1305                                               ELSE t := res;
- 1306                                                 QbeGen.CallEnd(TRUE, q)
- 1307                                               END
- 1308                                             ELSE
- 1309                                               IF res #
- 1310                                                  SymTab.InvalidType THEN
- 1311                                                 SemError(233)
- 1312                                               END;
- 1313                                               t := SymTab.InvalidType;
- 1314                                               QbeGen.CopyOp("0", q);
- 1315                                               QbeGen.CallEnd(FALSE, q)
- 1316                                             END; .) .
- 1317    (* One actual: VAR formals take recorded designator addresses
- 1318       (233 otherwise); value formals take converted expressions. *)
- 1319    ActParam<pn: SymTab.Name; pt: SymTab.TypeIndex; ind: BOOLEAN;
- 1320             methCls: SymTab.TypeIndex; i: CARDINAL>
- 1321                                          (. VAR at, ft: SymTab.TypeIndex;
- 1322                                               qe, qa, qt: QbeGen.QVal;
- 1323                                               isV, conv, va: BOOLEAN;
- 1324                                               cl: CHAR; .)
- 1325      = Expr<at, qe>                      (. va := (NOT ind)
- 1326                                               AND (methCls =
- 1327                                                  SymTab.InvalidType)
- 1328                                               AND (SymTab.SymKind(pn) =
- 1329                                                  SymTab.KindProc)
- 1330                                               AND SymTab.Varargs(pn);
- 1331                                             IF ind THEN
- 1332                                               ft :=
- 1333                                                 SymTab.ProcTypeParamType(pt,
- 1334                                                   i);
- 1335                                               isV :=
- 1336                                                 SymTab.ProcTypeParamIsVar(pt,
- 1337                                                   i)
- 1338                                             ELSIF methCls #
- 1339                                                SymTab.InvalidType THEN
- 1340                                               ft :=
- 1341                                                 SymTab.ClassMethodParamType(
- 1342                                                 methCls, pn, i);
- 1343                                               isV :=
- 1344                                                 SymTab.ClassMethodParamIsVar(
- 1345                                                 methCls, pn, i)
- 1346                                             ELSE
- 1347                                               ft := SymTab.ParamType(pn, i);
- 1348                                               isV := SymTab.ParamIsVar(pn, i)
- 1349                                             END;
- 1350                                             IF (at = SymTab.InvalidType) THEN
- 1351                                             ELSIF ft = SymTab.InvalidType THEN
- 1352                                               IF va THEN
- 1353                                                 QbeGen.CArgAdd(qe, at, qa, cl)
- 1354                                               END
- 1355                                             ELSIF isV THEN
- 1356                                               IF (SymTab.ClassOf(at)
- 1357                                                  = SymTab.ClChar)
- 1358    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
- 1359    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
- 1360         = SymTab.ClChar)
- 1361    AND QbeGen.IsImm(qe) THEN
- 1362                                                 (* 1-char string
- 1363                                                    literal passed to
- 1364                                                    a VAR ARRAY OF CHAR *)
- 1365                                                 QbeGen.DeclCharStr(qe,
- 1366                                                      qa);
- 1367                                                 IF NOT QbeGen.CallArg(qa,
- 1368                                                    "l") THEN
- 1369                                                   SemError(233)
- 1370                                                 END
- 1371                                               ELSIF NOT QbeGen.AddrOfVal(qe,
- 1372                                                    qa) THEN
- 1373                                                 SemError(233)
- 1374                                               ELSIF NOT SymTab.VarParamOk(at,
- 1375                                                        ft) THEN
- 1376                                                 SemError(233)
- 1377                                               ELSIF NOT QbeGen.CallArg(qa,
- 1378                                                        "l") THEN
- 1379                                                 SemError(233)
- 1380                                               END
- 1381                                             ELSE
- 1382                                               IF (SymTab.ClassOf(at)
- 1383                                                  = SymTab.ClChar)
- 1384    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
- 1385    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
- 1386         = SymTab.ClChar)
- 1387    AND QbeGen.IsImm(qe) THEN
- 1388                                                 (* 1-char string
- 1389                                                    literal passed to
- 1390                                                    ARRAY OF CHAR *)
- 1391                                                 QbeGen.DeclCharStr(qe,
- 1392                                                      qa);
- 1393                                                 IF NOT QbeGen.CallArg(qa,
- 1394                                                    "l") THEN
- 1395                                                   SemError(233)
- 1396                                                 END
- 1397                                               ELSIF NOT SymTab.Assignable(at,
- 1398                                                    ft) THEN
- 1399                                                 SemError(233)
- 1400                                               ELSE
- 1401                                                 conv := (SymTab.ClassOf(
- 1402                                                   ft) = SymTab.ClReal)
- 1403   AND SymTab.IsIntFamily(at);
- 1404                                                 IF conv THEN
- 1405                                                   QbeGen.ConvIR(qe, qt);
- 1406                                                   IF NOT QbeGen.CallArg(qt,
- 1407                                                      "d") THEN
- 1408                                                     SemError(233)
- 1409                                                   END
- 1410                                                 ELSIF NOT QbeGen.CallArg(qe,
- 1411                                                   QbeGen.ArgClass(ft)) THEN
- 1412                                                   SemError(233)
- 1413                                                 END
- 1414                                               END
- 1415                                             END; .) .
- 1416    IfStat                                (. VAR t: SymTab.TypeIndex;
- 1417                                               q, lThen, lElse, lEnd:
- 1418                                                 QbeGen.QVal;
- 1419                                               hasElse: BOOLEAN; .)
- 1420      = "IF"                              (. hasElse := FALSE; .)
- 1421        Expr<t, q>                        (. IF NOT SymTab.BoolCheck(t) THEN
- 1422                                               SemError(214) END;
- 1423                                             QbeGen.NewLabel(lThen);
- 1424                                             QbeGen.NewLabel(lElse);
- 1425                                             QbeGen.NewLabel(lEnd);
- 1426                                             QbeGen.Jnz(q, lThen, lElse);
- 1427                                             QbeGen.EmitLabel(lThen); .)
- 1428        "THEN" [ StatSeq ]                (. QbeGen.Jmp(lEnd); .)
- 1429        { "ELSIF"                         (. QbeGen.EmitLabel(lElse);
- 1430                                             QbeGen.NewLabel(lElse); .)
- 1431          Expr<t, q>                      (. IF NOT SymTab.BoolCheck(t) THEN
- 1432                                               SemError(214) END;
- 1433                                             QbeGen.NewLabel(lThen);
- 1434                                             QbeGen.Jnz(q, lThen, lElse);
- 1435                                             QbeGen.EmitLabel(lThen); .)
- 1436          "THEN" [ StatSeq ]              (. QbeGen.Jmp(lEnd); .) }
- 1437        [ "ELSE"                          (. QbeGen.EmitLabel(lElse);
- 1438                                             hasElse := TRUE; .)
- 1439          [ StatSeq ] ]
- 1440        "END"                             (. IF hasElse THEN
- 1441                                               QbeGen.EmitLabel(lEnd)
- 1442                                             ELSE QbeGen.EmitLabel(lElse);
- 1443                                               QbeGen.EmitLabel(lEnd)
- 1444                                             END; .) .
- 1445    WhileStat                             (. VAR t: SymTab.TypeIndex;
- 1446                                               q, lTop, lBody, lEnd:
- 1447                                                 QbeGen.QVal; .)
- 1448      = "WHILE"                           (. QbeGen.NewLabel(lTop);
- 1449                                             QbeGen.NewLabel(lBody);
- 1450                                             QbeGen.NewLabel(lEnd);
- 1451                                             QbeGen.EmitLabel(lTop); .)
- 1452        Expr<t, q>                        (. IF NOT SymTab.BoolCheck(t) THEN
- 1453                                               SemError(214) END;
- 1454                                             QbeGen.Jnz(q, lBody, lEnd);
- 1455                                             QbeGen.EmitLabel(lBody); .)
- 1456        "DO" [ StatSeq ]                      (. QbeGen.Jmp(lTop); .)
- 1457        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
- 1458    RepeatStat                            (. VAR t: SymTab.TypeIndex;
- 1459                                               q, lTop, lEnd: QbeGen.QVal; .)
- 1460      = "REPEAT"                          (. QbeGen.NewLabel(lTop);
- 1461                                             QbeGen.NewLabel(lEnd);
- 1462                                             QbeGen.EmitLabel(lTop); .)
- 1463        [ StatSeq ]
- 1464        "UNTIL" Expr<t, q>                (. IF NOT SymTab.BoolCheck(t) THEN
- 1465                                               SemError(214) END;
- 1466                                             QbeGen.Jnz(q, lEnd, lTop);
- 1467                                             QbeGen.EmitLabel(lEnd); .) .
- 1468    LoopStat                              (. VAR lTop, lEnd: QbeGen.QVal; .)
- 1469      = "LOOP"                            (. QbeGen.NewLabel(lTop);
- 1470                                             QbeGen.NewLabel(lEnd);
- 1471                                             QbeGen.PushLoop(lEnd);
- 1472                                             QbeGen.EmitLabel(lTop); .)
- 1473        [ StatSeq ]
- 1474        "END"                             (. QbeGen.Jmp(lTop);
- 1475                                             QbeGen.PopLoop;
- 1476                                             QbeGen.EmitLabel(lEnd); .) .
- 1477    (* FOR with static-sign BY (literal, non-zero; 220 otherwise).
- 1478       Runtime direction would need a compare-select; the literal
- 1479       sign picks cslew/csegew at "DO" time. *)
- 1480    ForStat                               (. VAR lv: SymTab.Name;
- 1481                                               tlo, thi, tby:
- 1482                                                 SymTab.TypeIndex;
- 1483                                               qlo, qhi, qby, qt, qk, qb:
- 1484                                                 QbeGen.QVal;
- 1485                                               lTop, lBody, lEnd:
- 1486                                                 QbeGen.QVal;
- 1487                                               by: INTEGER;
- 1488                                               ok: BOOLEAN; .)
- 1489      = "FOR"                             (. by := 1; .)
- 1490        GetIdent<lv>                      (. ok := SymTab.Lookup(lv);
- 1491                                             IF NOT ok THEN
- 1492                                               SemError(201)
- 1493                                             ELSIF (SymTab.SymKind(lv) #
- 1494                                                    SymTab.KindVar)
- 1495   AND (SymTab.SymKind(lv) #
- 1496                                                   SymTab.KindParam) THEN
- 1497                                               SemError(220); ok := FALSE
- 1498                                             ELSIF NOT SymTab.IsIntFamily(
- 1499                                                     SymTab.SymType(lv)) THEN
- 1500                                               SemError(220); ok := FALSE
- 1501                                             END; .)
- 1502        ":=" Expr<tlo, qlo>               (. IF NOT SymTab.IsIntFamily(tlo) THEN
- 1503                                               SemError(220); ok := FALSE
- 1504                                             END; .)
- 1505        "TO" Expr<thi, qhi>               (. IF NOT SymTab.IsIntFamily(thi) THEN
- 1506                                               SemError(220); ok := FALSE
- 1507                                             END; .)
- 1508        [ "BY" Expr<tby, qby>             (. IF (tby #
- 1509                                               SymTab.InvalidType)
- 1510   AND NOT SymTab.IsIntFamily(tby) THEN
- 1511                                               SemError(220); ok := FALSE
- 1512                                             END;
- 1513                                             IF NOT SymTab.ConstInt(qby, by) THEN
- 1514                                               SemError(230); by := 1
- 1515                                             ELSIF by = 0 THEN
- 1516                                               SemError(220); by := 1
- 1517                                             END; .) ]
- 1518        "DO"                              (. IF ok THEN
- 1519                                               QbeGen.StoreVar(lv, qlo,
- 1520                                                 FALSE) END;
- 1521                                             QbeGen.NewLabel(lTop);
- 1522                                             QbeGen.NewLabel(lBody);
- 1523                                             QbeGen.NewLabel(lEnd);
- 1524                                             QbeGen.EmitLabel(lTop);
- 1525                                             QbeGen.LoadVar(lv, FALSE, qt);
- 1526                                             QbeGen.NewTemp(qk);
- 1527                                             IF by > 0 THEN
- 1528                                               QbeGen.Op3("cslew", qk,
- 1529                                                 qt, qhi, FALSE)
- 1530                                             ELSE QbeGen.Op3("csgew", qk,
- 1531                                               qt, qhi, FALSE)
- 1532                                             END;
- 1533                                             QbeGen.Jnz(qk, lBody, lEnd);
- 1534                                             QbeGen.EmitLabel(lBody); .)
- 1535        [ StatSeq ]
- 1536        "END"                             (. IF ok THEN
- 1537                                               QbeGen.LoadVar(lv, FALSE,
- 1538                                                 qt);
- 1539                                               QbeGen.IntStr(by, qb);
- 1540                                               QbeGen.NewTemp(qk);
- 1541                                               QbeGen.Op3("add", qk,
- 1542                                                 qt, qb, FALSE);
- 1543                                               QbeGen.StoreVar(lv, qk,
- 1544                                                 FALSE) END;
- 1545                                             QbeGen.Jmp(lTop);
- 1546                                             QbeGen.EmitLabel(lEnd); .) .
- 1547    CaseStat                              (. VAR tsel: SymTab.TypeIndex;
- 1548                                               qsel, lEnd: QbeGen.QVal; .)
- 1549      = "CASE" Expr<tsel, qsel>           (. QbeGen.NewLabel(lEnd); .)
- 1550        "OF" CaseAlt<tsel, qsel, lEnd>
- 1551        { "|" CaseAlt<tsel, qsel, lEnd> }
- 1552        [ "ELSE" [ StatSeq ] ]
- 1553        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
- 1554    (* Compare-chain lowering: each alternative ends its match-tests
- 1555       with "jmp lAfter", so the no-match fallthrough skips the body:
- 1556       "cmp; jnz(lBody,lF); lF: ... ; jmp lAfter; lBody: S; jmp lEnd;
- 1557       lAfter:". Falls into the next alternative, ELSE, or END. *)
- 1558    CaseAlt<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
- 1559            lEnd: QbeGen.QVal>            (. VAR lBody, lAfter: QbeGen.QVal; .)
- 1560      =                                   (. QbeGen.NewLabel(lBody);
- 1561                                             QbeGen.NewLabel(lAfter); .)
- 1562        CaseLabel<tsel, qsel, lBody>
- 1563        { "," CaseLabel<tsel, qsel, lBody> }
- 1564        ":"                               (. QbeGen.Jmp(lAfter);
- 1565                                             QbeGen.EmitLabel(lBody); .)
- 1566        [ StatSeq ]                       (. QbeGen.Jmp(lEnd);
- 1567                                             QbeGen.EmitLabel(lAfter); .) .
- 1568    CaseLabel<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
- 1569              lBody: QbeGen.QVal>         (. VAR t2, t3: SymTab.TypeIndex;
- 1570                                               q2, q3, qc, qd, qe:
- 1571                                                 QbeGen.QVal;
- 1572                                               lNext: QbeGen.QVal; .)
- 1573      = Expr<t2, q2>                      (. IF (t2 #
- 1574                                               SymTab.InvalidType)
- 1575   AND (tsel #
- 1576                                                 SymTab.InvalidType)
- 1577   AND ((SymTab.ClassOf(t2) =
- 1578                                                  SymTab.ClSet)
- 1579                                                 OR (SymTab.ClassOf(tsel) =
- 1580                                                     SymTab.ClSet)) THEN
- 1581                                               SemError(230)
- 1582                                             ELSIF (t2 #
- 1583                                               SymTab.InvalidType)
- 1584   AND (tsel #
- 1585                                                 SymTab.InvalidType)
- 1586   AND NOT SymTab.EqCheck(t2,
- 1587                                                   tsel) THEN
- 1588                                               SemError(213) END;
- 1589                                             IF NOT QbeGen.IsImm(q2) THEN
- 1590                                               SemError(230);
- 1591                                               QbeGen.CopyOp("0", q2)
- 1592                                             END;
- 1593                                             QbeGen.NewLabel(lNext);
- 1594                                             QbeGen.Cmp(SymTab.OpEq,
- 1595                                               qsel, q2, qc, FALSE);
- 1596                                             QbeGen.Jnz(qc, lBody, lNext);
- 1597                                             QbeGen.EmitLabel(lNext); .)
- 1598        [ ".." Expr<t3, q3>               (. IF (t3 #
- 1599                                               SymTab.InvalidType)
- 1600   AND (tsel #
- 1601                                                 SymTab.InvalidType)
- 1602   AND NOT SymTab.EqCheck(t3,
- 1603                                                   tsel) THEN
- 1604                                               SemError(213) END;
- 1605                                             IF NOT QbeGen.IsImm(q3) THEN
- 1606                                               SemError(230);
- 1607                                               QbeGen.CopyOp("0", q3)
- 1608                                             END;
- 1609                                             QbeGen.Cmp(SymTab.OpGe,
- 1610                                               qsel, q2, qc, FALSE);
- 1611                                             QbeGen.Cmp(SymTab.OpLe,
- 1612                                               qsel, q3, qd, FALSE);
- 1613                                             QbeGen.NewTemp(qe);
- 1614                                             QbeGen.Op3("and", qe, qc, qd,
- 1615                                               FALSE);
- 1616                                             QbeGen.NewLabel(lNext);
- 1617                                             QbeGen.Jnz(qe, lBody, lNext);
- 1618                                             QbeGen.EmitLabel(lNext); .) ] .
- 1619    ReturnStat                            (. VAR t: SymTab.TypeIndex;
- 1620                                               q, qt: QbeGen.QVal;
- 1621                                               res: SymTab.TypeIndex;
- 1622                                               hadE, conv: BOOLEAN; .)
- 1623      = "RETURN"                          (. hadE := FALSE; .)
- 1624        [ Expr<t, q>                      (. hadE := TRUE; .) ]
- 1625                                          (. conv := FALSE;
- 1626                                             IF NOT SymTab.InProc() THEN
- 1627                                               SemError(232)
- 1628                                             ELSE res := SymTab.CurRes();
- 1629                                               IF NOT hadE THEN
- 1630                                                 IF res #
- 1631                                                    SymTab.InvalidType THEN
- 1632                                                   SemError(232)
- 1633                                                 ELSE QbeGen.EmitRet(q,
- 1634                                                   FALSE)
- 1635                                                 END
- 1636                                               ELSIF (res =
- 1637                                                      SymTab.InvalidType)
- 1638                                                  OR (t #
- 1639                                                      SymTab.InvalidType)
- 1640   AND NOT SymTab.Assignable(t,
- 1641                                                       res) THEN
- 1642                                                 SemError(232)
- 1643                                               ELSE
- 1644                                                 conv := (SymTab.ClassOf(
- 1645                                                   res) = SymTab.ClReal)
- 1646   AND SymTab.IsIntFamily(t);
- 1647                                                 IF conv THEN
- 1648                                                   QbeGen.ConvIR(q, qt);
- 1649                                                   QbeGen.EmitRet(qt, TRUE)
- 1650                                                 ELSE QbeGen.EmitRet(q, TRUE)
- 1651                                                 END
- 1652                                               END
- 1653                                             END; .) .
- 1654    HaltStat                              (. VAR t: SymTab.TypeIndex;
- 1655                                               q: QbeGen.QVal; .)
- 1656      = "HALT" [ "(" Expr<t, q> ")" ]     (. QbeGen.HaltQ; .) .
- 1657    (* Designator: scalar loads, array addresses, and index suffixes.
- 1658       Each index descends one level (bounds-checked, trap on breach);
- 1659       nested levels reload the inner descriptor address. q ends as the
- 1660       value (scalars), the descriptor address (plain arrays), or the
- 1661       element address (indexed); sfx marks the indexed form. *)
- 1662    Design<VAR t: SymTab.TypeIndex; VAR k: INTEGER;
- 1663           VAR q: QbeGen.QVal; VAR qn: SymTab.Name; VAR sfx: BOOLEAN>
- 1664                                          (. VAR n, fn, mal: SymTab.Name;
- 1665                                               cls: INTEGER;
- 1666                                               ic: SymTab.TypeIndex;
- 1667                                               curT, it, eT, bt:
- 1668                                                 SymTab.TypeIndex;
- 1669                                               iq, ql, qlo, qhi, qe:
- 1670                                                 QbeGen.QVal;
- 1671                                               lo, hi: INTEGER;
- 1672                                               fo: INTEGER;
- 1673                                               isOpen: BOOLEAN;
- 1674                                               qb, cv: QbeGen.QVal; .)
- 1675      = GetIdent<n>                       (. methCls := SymTab.InvalidType;
- 1676                                             QbeGen.CopyOp(n, qn);
- 1677                                             sfx := FALSE;
- 1678                                             IF NOT SymTab.Lookup(n) THEN
- 1679                                               (* a bare method name inside
- 1680                                                  a CLASS IMPLEMENTATION
- 1681                                                  is a sibling call on
- 1682                                                  THIS *)
- 1683                                               ic := SymTab.CurImplClass();
- 1684                                               IF (ic #
- 1685                                                  SymTab.InvalidType)
- 1686    AND SymTab.MethodExists(ic, n) THEN
- 1687                                                 sfx := FALSE;
- 1688                                                 QbeGen.ThisBase(q);
- 1689                                                 QbeGen.ArmRecv(q);
- 1690                                                 methCls := ic;
- 1691                                                 k := SymTab.KindProc;
- 1692                                                 t := SymTab.InvalidType
- 1693                                               ELSE
- 1694                                                 SemError(201);
- 1695                                                 t :=
- 1696                                                   SymTab.InvalidType;
- 1697                                                 k := -1;
- 1698                                                 QbeGen.CopyOp("0", q)
- 1699                                               END
- 1700                                             ELSE
- 1701                                               t := SymTab.SymType(n);
- 1702                                               k := SymTab.SymKind(n);
- 1703                                               IF k = SymTab.KindConst THEN
- 1704                                                 IF SymTab.Equal(n,
- 1705                                                    "TRUE") THEN
- 1706                                                   t := SymTab.BoolType();
- 1707                                                   QbeGen.CopyOp("1", q)
- 1708                                                 ELSIF SymTab.Equal(n,
- 1709                                                    "FALSE") THEN
- 1710                                                   t := SymTab.BoolType();
- 1711                                                   QbeGen.CopyOp("0", q)
- 1712                                                 ELSIF SymTab.Equal(n,
- 1713                                                    "NIL") THEN
- 1714                                                   QbeGen.CopyOp("0", q)
- 1715                                                 ELSE
- 1716                                                   cls :=
- 1717                                                     SymTab.ClassOf(t);
- 1718                                                   IF (t #
- 1719                                                       SymTab.InvalidType)
- 1720   AND ((cls = SymTab.ClInt)
- 1721                                                      OR (cls
- 1722                                                          = SymTab.ClChar)
- 1723                                                      OR (cls
- 1724                                                          = SymTab.ClEnum)
- 1725                                                      OR (cls
- 1726                                                          = SymTab.ClReal)
- 1727                                                      OR (cls
- 1728                                                          = SymTab.ClLong)
- 1729                                                      OR (cls
- 1730                                                          = SymTab.ClNil)) THEN
- 1731                                                     IF cls = SymTab.ClNil THEN
- 1732                                                       QbeGen.CopyOp("0", q)
- 1733                                                     ELSIF ((cls
- 1734                                                         = SymTab.ClInt)
- 1735                                                       OR (cls
- 1736                                                         = SymTab.ClChar)
- 1737                                                       OR (cls
- 1738                                                         = SymTab.ClEnum)
- 1739                                                       OR (cls
- 1740                                                         = SymTab.ClLong))
- 1741    AND SymTab.GetSymVal(n, cv)
- 1742    AND QbeGen.IsImm(cv) THEN
- 1743                                                       QbeGen.CopyOp(cv, q)
- 1744                                                     ELSE
- 1745                                                       QbeGen.LoadVar(n,
- 1746                                                         cls = SymTab.ClReal,
- 1747                                                         q)
- 1748                                                     END
- 1749                                                   ELSIF (cls = SymTab.ClArray)
- 1750                                                      OR (cls = SymTab.ClRecord)
- 1751                                                      OR (cls = SymTab.ClClass)
- 1752                                                      OR (cls = SymTab.ClStr)
- 1753                                                      OR (cls = SymTab.ClUStr) THEN
- 1754                                                     (* aggregate constant:
- 1755                                                        its value IS the
- 1756                                                        descriptor address *)
- 1757                                                     IF SymTab.GetSymVal(n, cv) THEN
- 1758                                                       QbeGen.CopyOp(cv, q)
- 1759                                                     ELSE
- 1760                                                       QbeGen.CopyOp("0", q)
- 1761                                                     END
- 1762                                                   ELSE
- 1763                                                     IF t #
- 1764                                                        SymTab.InvalidType THEN
- 1765                                                       SemError(230)
- 1766                                                     END;
- 1767                                                     QbeGen.CopyOp("0", q)
- 1768                                                   END
- 1769                                                 END
- 1770                                               ELSIF (k = SymTab.KindVar)
- 1771                                                  OR (k = SymTab.KindParam) THEN
- 1772                                                 cls :=
- 1773                                                   SymTab.ClassOf(t);
- 1774                                                 IF (cls = SymTab.ClInt)
- 1775                                                    OR (cls = SymTab.ClBool)
- 1776                                                    OR (cls = SymTab.ClChar)
- 1777                                                    OR (cls = SymTab.ClUChar)
- 1778                                                    OR (cls = SymTab.ClEnum)
- 1779                                                    OR (cls
- 1780                                                        = SymTab.ClReal) THEN
- 1781                                                   QbeGen.LoadVar(n,
- 1782                                                     cls = SymTab.ClReal, q)
- 1783                                                 ELSIF (cls = SymTab.ClPtr)
- 1784                                                    OR (cls = SymTab.ClProc) THEN
- 1785                                                   QbeGen.LoadPtr(n, q)
- 1786                                                 ELSIF cls = SymTab.ClLong THEN
- 1787                                                   QbeGen.LoadLong(n, q)
- 1788                                                 ELSIF (cls
- 1789                                                         = SymTab.ClArray)
- 1790                                                    OR (cls
- 1791                                                        = SymTab.ClSet)
- 1792                                                    OR (cls
- 1793                                                        = SymTab.ClRecord)
- 1794                                                    OR (cls
- 1795                                                        = SymTab.ClUStr)
- 1796                                                    OR (cls
- 1797                                                        = SymTab.ClClass) THEN
- 1798                                                   QbeGen.AddrOf(n, q)
- 1799                                                 ELSE SemError(230);
- 1800                                                   QbeGen.CopyOp("0", q)
+ 1189                                             ELSIF SymTab.ClassOf(dt) =
+ 1190                                                   SymTab.ClArray THEN
+ 1191                                               IF (et # SymTab.InvalidType)
+ 1192    AND (SymTab.ClassOf(et) = SymTab.ClUStr)
+ 1193    AND SymTab.IsUCharArray(dt) THEN
+ 1194                                                 QbeGen.UAssign(qd, qe)
+ 1195                                               ELSIF SymTab.StrCompat(dt,
+ 1196                                                    et) THEN
+ 1197                                                 QbeGen.StrAssign(qd, qe)
+ 1198                                               ELSE
+ 1199                                                 QbeGen.CopyArray(qd, qe,
+ 1200                                                   dt)
+ 1201                                               END
+ 1202                                             ELSIF SymTab.ClassOf(dt) =
+ 1203                                                   SymTab.ClSet THEN
+ 1204                                               QbeGen.CopySet(qd, qe,
+ 1205                                                 SymTab.SetWords(dt),
+ 1206                                                 SymTab.SetWords(et))
+ 1207                                             ELSIF SymTab.ClassOf(dt) =
+ 1208                                                   SymTab.ClRecord THEN
+ 1209                                               QbeGen.CopyRecord(qd, qe, dt)
+ 1210                                             ELSIF (SymTab.ClassOf(dt) =
+ 1211                                                   SymTab.ClPtr)
+ 1212                                                OR (SymTab.ClassOf(dt) =
+ 1213                                                   SymTab.ClProc) THEN
+ 1214                                               QbeGen.StorePtr(qn, qe)
+ 1215                                             ELSIF SymTab.IsLongFamily(dt) THEN
+ 1216                                               IF wconv THEN
+ 1217                                                 QbeGen.WidenLong(qe, ql);
+ 1218                                                 QbeGen.StoreLong(qn, ql)
+ 1219                                               ELSE QbeGen.StoreLong(qn, qe)
+ 1220                                               END
+ 1221                                             ELSIF conv THEN
+ 1222                                               QbeGen.ConvIR(qe, qt);
+ 1223                                               QbeGen.StoreVar(qn, qt, TRUE)
+ 1224                                             ELSE
+ 1225                                               QbeGen.StoreVar(qn, qe, isR)
+ 1226                                             END
+ 1227                                           END; .)
+ 1228        | ArgList<qn, dt, qd, FALSE, methCls, ct2, q2, called>
+ 1229        |                                 (* bare `P;`: proper parameterless
+ 1230                                              procedure call; anything else
+ 1231                                              here is 233 (was a bare syntax
+ 1232                                              error before 4.2) *)
+ 1233                                          (. IF (dk = SymTab.KindProc)
+ 1234   AND NOT sfx THEN
+ 1235                                               res0 := SymTab.ProcRes(qn);
+ 1236                                               IF res0 #
+ 1237                                                  SymTab.InvalidType THEN
+ 1238                                                 SemError(233)
+ 1239                                               ELSIF SymTab.ProcNPar(qn) #
+ 1240                                                       0 THEN
+ 1241                                                 SemError(233)
+ 1242                                               ELSE QbeGen.Mangled(qn,
+ 1243                                                 SymTab.ProcUid(qn), mg0);
+ 1244                                                 QbeGen.CallBegin(mg0,
+ 1245                                                   res0,
+ 1246                                                   SymTab.ProcDepthOf(qn),
+ 1247                                                   SymTab.IsExternal(qn));
+ 1248                                                 QbeGen.CallEnd(FALSE, q2)
+ 1249                                               END
+ 1250                                             ELSE SemError(233)
+ 1251                                             END; .) ) .
+ 1252    (* Actual-parameter list shared by statement and expression calls.
+ 1253       want selects CallEnd's result handling; t/q carry the call
+ 1254       value (statement calls discard). Arity/type failures are 233;
+ 1255       evaluation code still emits so the .ssa stays assembleable. *)
+ 1256    ArgList<pn: SymTab.Name; pt: SymTab.TypeIndex; callee: QbeGen.QVal;
+ 1257            want: BOOLEAN; methCls: SymTab.TypeIndex;
+ 1258            VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal;
+ 1259            VAR called: BOOLEAN>          (. VAR i, np: CARDINAL;
+ 1260                                               vs: INTEGER;
+ 1261                                               res: SymTab.TypeIndex;
+ 1262                                               mg: QbeGen.QVal;
+ 1263                                               ok, ind, isMeth, va: BOOLEAN; .)
+ 1264      = "("                               (. called := TRUE;
+ 1265                                             ok := TRUE;
+ 1266                                             ind := FALSE;
+ 1267                                             isMeth := methCls #
+ 1268                                               SymTab.InvalidType;
+ 1269                                             IF isMeth THEN
+ 1270                                               (* class method: the
+ 1271                                                  receiver is armed.
+ 1272                                                  Virtual -> dispatch
+ 1273                                                  through the vtable;
+ 1274                                                  otherwise a static
+ 1275                                                  call. *)
+ 1276                                               res := SymTab.ClassMethodRes(
+ 1277                                                 methCls, pn);
+ 1278                                               vs := SymTab.VirtSlot(
+ 1279                                                 methCls, pn);
+ 1280                                               IF vs >= 0 THEN
+ 1281                                                 QbeGen.VirtCallBegin(
+ 1282                                                   callee, vs, res)
+ 1283                                               ELSE
+ 1284                                                 QbeGen.Mangled(pn,
+ 1285                                                   SymTab.ClassMethodUid(
+ 1286                                                   methCls, pn), mg);
+ 1287                                                 QbeGen.CallBegin(mg, res, 0,
+ 1288                                                   FALSE)
+ 1289                                               END
+ 1290                                             ELSIF SymTab.SymKind(pn) =
+ 1291                                                SymTab.KindProc THEN
+ 1292                                               res := SymTab.ProcRes(pn);
+ 1293                                               QbeGen.Mangled(pn,
+ 1294                                                 SymTab.ProcUid(pn), mg);
+ 1295                                               QbeGen.CallBegin(mg, res,
+ 1296                                                 SymTab.ProcDepthOf(pn),
+ 1297                                                 SymTab.IsExternal(pn))
+ 1298                                             ELSIF (pt # SymTab.InvalidType)
+ 1299    AND (SymTab.ClassOf(pt) = SymTab.ClProc) THEN
+ 1300                                               ind := TRUE;
+ 1301                                               res :=
+ 1302                                                 SymTab.ProcTypeRes(pt);
+ 1303                                               QbeGen.CallBeginInd(callee,
+ 1304                                                 res, FALSE)
+ 1305                                             ELSE SemError(233);
+ 1306                                               ok := FALSE;
+ 1307                                               res := SymTab.InvalidType
+ 1308                                             END;
+ 1309                                             i := 0; .)
+ 1310        [ ActParam<pn, pt, ind, methCls, i>        (. INC(i); .)
+ 1311          { "," ActParam<pn, pt, ind, methCls, i>  (. INC(i); .) } ]
+ 1312        ")"                               (. IF ok THEN
+ 1313                                               IF isMeth THEN
+ 1314                                                 np := SymTab.ClassMethodNPar(
+ 1315                                                   methCls, pn)
+ 1316                                               ELSIF ind THEN
+ 1317                                                 np := SymTab.ProcTypeNPar(pt)
+ 1318                                               ELSE np := SymTab.ProcNPar(pn)
+ 1319                                               END;
+ 1320                                               va := (NOT isMeth) AND (NOT ind)
+ 1321                                                 AND (SymTab.SymKind(pn) =
+ 1322                                                      SymTab.KindProc)
+ 1323                                                 AND SymTab.Varargs(pn);
+ 1324                                               IF (i # np) AND NOT va THEN
+ 1325                                                 SemError(233); ok := FALSE
+ 1326                                               END
+ 1327                                             END;
+ 1328                                             IF NOT ok THEN
+ 1329                                               t := SymTab.InvalidType;
+ 1330                                               QbeGen.CopyOp("0", q)
+ 1331                                             ELSIF want THEN
+ 1332                                               IF res =
+ 1333                                                  SymTab.InvalidType THEN
+ 1334                                                 SemError(233);
+ 1335                                                 t := SymTab.InvalidType;
+ 1336                                                 QbeGen.CopyOp("0", q)
+ 1337                                               ELSE t := res;
+ 1338                                                 QbeGen.CallEnd(TRUE, q)
+ 1339                                               END
+ 1340                                             ELSE
+ 1341                                               IF res #
+ 1342                                                  SymTab.InvalidType THEN
+ 1343                                                 SemError(233)
+ 1344                                               END;
+ 1345                                               t := SymTab.InvalidType;
+ 1346                                               QbeGen.CopyOp("0", q);
+ 1347                                               QbeGen.CallEnd(FALSE, q)
+ 1348                                             END; .) .
+ 1349    (* One actual: VAR formals take recorded designator addresses
+ 1350       (233 otherwise); value formals take converted expressions. *)
+ 1351    ActParam<pn: SymTab.Name; pt: SymTab.TypeIndex; ind: BOOLEAN;
+ 1352             methCls: SymTab.TypeIndex; i: CARDINAL>
+ 1353                                          (. VAR at, ft: SymTab.TypeIndex;
+ 1354                                               qe, qa, qt: QbeGen.QVal;
+ 1355                                               isV, conv, va: BOOLEAN;
+ 1356                                               cl: CHAR; .)
+ 1357      = Expr<at, qe>                      (. va := (NOT ind)
+ 1358                                               AND (methCls =
+ 1359                                                  SymTab.InvalidType)
+ 1360                                               AND (SymTab.SymKind(pn) =
+ 1361                                                  SymTab.KindProc)
+ 1362                                               AND SymTab.Varargs(pn);
+ 1363                                             IF ind THEN
+ 1364                                               ft :=
+ 1365                                                 SymTab.ProcTypeParamType(pt,
+ 1366                                                   i);
+ 1367                                               isV :=
+ 1368                                                 SymTab.ProcTypeParamIsVar(pt,
+ 1369                                                   i)
+ 1370                                             ELSIF methCls #
+ 1371                                                SymTab.InvalidType THEN
+ 1372                                               ft :=
+ 1373                                                 SymTab.ClassMethodParamType(
+ 1374                                                 methCls, pn, i);
+ 1375                                               isV :=
+ 1376                                                 SymTab.ClassMethodParamIsVar(
+ 1377                                                 methCls, pn, i)
+ 1378                                             ELSE
+ 1379                                               ft := SymTab.ParamType(pn, i);
+ 1380                                               isV := SymTab.ParamIsVar(pn, i)
+ 1381                                             END;
+ 1382                                             IF (at = SymTab.InvalidType) THEN
+ 1383                                             ELSIF ft = SymTab.InvalidType THEN
+ 1384                                               IF va THEN
+ 1385                                                 QbeGen.CArgAdd(qe, at, qa, cl)
+ 1386                                               END
+ 1387                                             ELSIF isV THEN
+ 1388                                               IF (SymTab.ClassOf(at)
+ 1389                                                  = SymTab.ClChar)
+ 1390    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
+ 1391    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
+ 1392         = SymTab.ClChar)
+ 1393    AND QbeGen.IsImm(qe) THEN
+ 1394                                                 (* 1-char string
+ 1395                                                    literal passed to
+ 1396                                                    a VAR ARRAY OF CHAR *)
+ 1397                                                 QbeGen.DeclCharStr(qe,
+ 1398                                                      qa);
+ 1399                                                 IF NOT QbeGen.CallArg(qa,
+ 1400                                                    "l") THEN
+ 1401                                                   SemError(233)
+ 1402                                                 END
+ 1403                                               ELSIF NOT QbeGen.AddrOfVal(qe,
+ 1404                                                    qa) THEN
+ 1405                                                 SemError(233)
+ 1406                                               ELSIF NOT SymTab.VarParamOk(at,
+ 1407                                                        ft) THEN
+ 1408                                                 SemError(233)
+ 1409                                               ELSIF NOT QbeGen.CallArg(qa,
+ 1410                                                        "l") THEN
+ 1411                                                 SemError(233)
+ 1412                                               END
+ 1413                                             ELSE
+ 1414                                               IF (SymTab.ClassOf(at)
+ 1415                                                  = SymTab.ClChar)
+ 1416    AND (SymTab.ClassOf(ft) = SymTab.ClArray)
+ 1417    AND (SymTab.ClassOf(SymTab.ArrayElem(ft))
+ 1418         = SymTab.ClChar)
+ 1419    AND QbeGen.IsImm(qe) THEN
+ 1420                                                 (* 1-char string
+ 1421                                                    literal passed to
+ 1422                                                    ARRAY OF CHAR *)
+ 1423                                                 QbeGen.DeclCharStr(qe,
+ 1424                                                      qa);
+ 1425                                                 IF NOT QbeGen.CallArg(qa,
+ 1426                                                    "l") THEN
+ 1427                                                   SemError(233)
+ 1428                                                 END
+ 1429                                               ELSIF NOT SymTab.Assignable(at,
+ 1430                                                    ft) THEN
+ 1431                                                 SemError(233)
+ 1432                                               ELSE
+ 1433                                                 conv := (SymTab.ClassOf(
+ 1434                                                   ft) = SymTab.ClReal)
+ 1435   AND SymTab.IsIntFamily(at);
+ 1436                                                 IF conv THEN
+ 1437                                                   QbeGen.ConvIR(qe, qt);
+ 1438                                                   IF NOT QbeGen.CallArg(qt,
+ 1439                                                      "d") THEN
+ 1440                                                     SemError(233)
+ 1441                                                   END
+ 1442                                                 ELSIF NOT QbeGen.CallArg(qe,
+ 1443                                                   QbeGen.ArgClass(ft)) THEN
+ 1444                                                   SemError(233)
+ 1445                                                 END
+ 1446                                               END
+ 1447                                             END; .) .
+ 1448    IfStat                                (. VAR t: SymTab.TypeIndex;
+ 1449                                               q, lThen, lElse, lEnd:
+ 1450                                                 QbeGen.QVal;
+ 1451                                               hasElse: BOOLEAN; .)
+ 1452      = "IF"                              (. hasElse := FALSE; .)
+ 1453        Expr<t, q>                        (. IF NOT SymTab.BoolCheck(t) THEN
+ 1454                                               SemError(214) END;
+ 1455                                             QbeGen.NewLabel(lThen);
+ 1456                                             QbeGen.NewLabel(lElse);
+ 1457                                             QbeGen.NewLabel(lEnd);
+ 1458                                             QbeGen.Jnz(q, lThen, lElse);
+ 1459                                             QbeGen.EmitLabel(lThen); .)
+ 1460        "THEN" [ StatSeq ]                (. QbeGen.Jmp(lEnd); .)
+ 1461        { "ELSIF"                         (. QbeGen.EmitLabel(lElse);
+ 1462                                             QbeGen.NewLabel(lElse); .)
+ 1463          Expr<t, q>                      (. IF NOT SymTab.BoolCheck(t) THEN
+ 1464                                               SemError(214) END;
+ 1465                                             QbeGen.NewLabel(lThen);
+ 1466                                             QbeGen.Jnz(q, lThen, lElse);
+ 1467                                             QbeGen.EmitLabel(lThen); .)
+ 1468          "THEN" [ StatSeq ]              (. QbeGen.Jmp(lEnd); .) }
+ 1469        [ "ELSE"                          (. QbeGen.EmitLabel(lElse);
+ 1470                                             hasElse := TRUE; .)
+ 1471          [ StatSeq ] ]
+ 1472        "END"                             (. IF hasElse THEN
+ 1473                                               QbeGen.EmitLabel(lEnd)
+ 1474                                             ELSE QbeGen.EmitLabel(lElse);
+ 1475                                               QbeGen.EmitLabel(lEnd)
+ 1476                                             END; .) .
+ 1477    WhileStat                             (. VAR t: SymTab.TypeIndex;
+ 1478                                               q, lTop, lBody, lEnd:
+ 1479                                                 QbeGen.QVal; .)
+ 1480      = "WHILE"                           (. QbeGen.NewLabel(lTop);
+ 1481                                             QbeGen.NewLabel(lBody);
+ 1482                                             QbeGen.NewLabel(lEnd);
+ 1483                                             QbeGen.EmitLabel(lTop); .)
+ 1484        Expr<t, q>                        (. IF NOT SymTab.BoolCheck(t) THEN
+ 1485                                               SemError(214) END;
+ 1486                                             QbeGen.Jnz(q, lBody, lEnd);
+ 1487                                             QbeGen.EmitLabel(lBody); .)
+ 1488        "DO" [ StatSeq ]                      (. QbeGen.Jmp(lTop); .)
+ 1489        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
+ 1490    RepeatStat                            (. VAR t: SymTab.TypeIndex;
+ 1491                                               q, lTop, lEnd: QbeGen.QVal; .)
+ 1492      = "REPEAT"                          (. QbeGen.NewLabel(lTop);
+ 1493                                             QbeGen.NewLabel(lEnd);
+ 1494                                             QbeGen.EmitLabel(lTop); .)
+ 1495        [ StatSeq ]
+ 1496        "UNTIL" Expr<t, q>                (. IF NOT SymTab.BoolCheck(t) THEN
+ 1497                                               SemError(214) END;
+ 1498                                             QbeGen.Jnz(q, lEnd, lTop);
+ 1499                                             QbeGen.EmitLabel(lEnd); .) .
+ 1500    LoopStat                              (. VAR lTop, lEnd: QbeGen.QVal; .)
+ 1501      = "LOOP"                            (. QbeGen.NewLabel(lTop);
+ 1502                                             QbeGen.NewLabel(lEnd);
+ 1503                                             QbeGen.PushLoop(lEnd);
+ 1504                                             QbeGen.EmitLabel(lTop); .)
+ 1505        [ StatSeq ]
+ 1506        "END"                             (. QbeGen.Jmp(lTop);
+ 1507                                             QbeGen.PopLoop;
+ 1508                                             QbeGen.EmitLabel(lEnd); .) .
+ 1509    (* FOR with static-sign BY (literal, non-zero; 220 otherwise).
+ 1510       Runtime direction would need a compare-select; the literal
+ 1511       sign picks cslew/csegew at "DO" time. *)
+ 1512    ForStat                               (. VAR lv: SymTab.Name;
+ 1513                                               tlo, thi, tby:
+ 1514                                                 SymTab.TypeIndex;
+ 1515                                               qlo, qhi, qby, qt, qk, qb:
+ 1516                                                 QbeGen.QVal;
+ 1517                                               lTop, lBody, lEnd:
+ 1518                                                 QbeGen.QVal;
+ 1519                                               by: INTEGER;
+ 1520                                               ok: BOOLEAN; .)
+ 1521      = "FOR"                             (. by := 1; .)
+ 1522        GetIdent<lv>                      (. ok := SymTab.Lookup(lv);
+ 1523                                             IF NOT ok THEN
+ 1524                                               SemError(201)
+ 1525                                             ELSIF (SymTab.SymKind(lv) #
+ 1526                                                    SymTab.KindVar)
+ 1527   AND (SymTab.SymKind(lv) #
+ 1528                                                   SymTab.KindParam) THEN
+ 1529                                               SemError(220); ok := FALSE
+ 1530                                             ELSIF NOT SymTab.IsIntFamily(
+ 1531                                                     SymTab.SymType(lv)) THEN
+ 1532                                               SemError(220); ok := FALSE
+ 1533                                             END; .)
+ 1534        ":=" Expr<tlo, qlo>               (. IF NOT SymTab.IsIntFamily(tlo) THEN
+ 1535                                               SemError(220); ok := FALSE
+ 1536                                             END; .)
+ 1537        "TO" Expr<thi, qhi>               (. IF NOT SymTab.IsIntFamily(thi) THEN
+ 1538                                               SemError(220); ok := FALSE
+ 1539                                             END; .)
+ 1540        [ "BY" Expr<tby, qby>             (. IF (tby #
+ 1541                                               SymTab.InvalidType)
+ 1542   AND NOT SymTab.IsIntFamily(tby) THEN
+ 1543                                               SemError(220); ok := FALSE
+ 1544                                             END;
+ 1545                                             IF NOT SymTab.ConstInt(qby, by) THEN
+ 1546                                               SemError(230); by := 1
+ 1547                                             ELSIF by = 0 THEN
+ 1548                                               SemError(220); by := 1
+ 1549                                             END; .) ]
+ 1550        "DO"                              (. IF ok THEN
+ 1551                                               QbeGen.StoreVar(lv, qlo,
+ 1552                                                 FALSE) END;
+ 1553                                             QbeGen.NewLabel(lTop);
+ 1554                                             QbeGen.NewLabel(lBody);
+ 1555                                             QbeGen.NewLabel(lEnd);
+ 1556                                             QbeGen.EmitLabel(lTop);
+ 1557                                             QbeGen.LoadVar(lv, FALSE, qt);
+ 1558                                             QbeGen.NewTemp(qk);
+ 1559                                             IF by > 0 THEN
+ 1560                                               QbeGen.Op3("cslew", qk,
+ 1561                                                 qt, qhi, FALSE)
+ 1562                                             ELSE QbeGen.Op3("csgew", qk,
+ 1563                                               qt, qhi, FALSE)
+ 1564                                             END;
+ 1565                                             QbeGen.Jnz(qk, lBody, lEnd);
+ 1566                                             QbeGen.EmitLabel(lBody); .)
+ 1567        [ StatSeq ]
+ 1568        "END"                             (. IF ok THEN
+ 1569                                               QbeGen.LoadVar(lv, FALSE,
+ 1570                                                 qt);
+ 1571                                               QbeGen.IntStr(by, qb);
+ 1572                                               QbeGen.NewTemp(qk);
+ 1573                                               QbeGen.Op3("add", qk,
+ 1574                                                 qt, qb, FALSE);
+ 1575                                               QbeGen.StoreVar(lv, qk,
+ 1576                                                 FALSE) END;
+ 1577                                             QbeGen.Jmp(lTop);
+ 1578                                             QbeGen.EmitLabel(lEnd); .) .
+ 1579    CaseStat                              (. VAR tsel: SymTab.TypeIndex;
+ 1580                                               qsel, lEnd: QbeGen.QVal; .)
+ 1581      = "CASE" Expr<tsel, qsel>           (. QbeGen.NewLabel(lEnd); .)
+ 1582        "OF" CaseAlt<tsel, qsel, lEnd>
+ 1583        { "|" CaseAlt<tsel, qsel, lEnd> }
+ 1584        [ "ELSE" [ StatSeq ] ]
+ 1585        "END"                             (. QbeGen.EmitLabel(lEnd); .) .
+ 1586    (* Compare-chain lowering: each alternative ends its match-tests
+ 1587       with "jmp lAfter", so the no-match fallthrough skips the body:
+ 1588       "cmp; jnz(lBody,lF); lF: ... ; jmp lAfter; lBody: S; jmp lEnd;
+ 1589       lAfter:". Falls into the next alternative, ELSE, or END. *)
+ 1590    CaseAlt<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
+ 1591            lEnd: QbeGen.QVal>            (. VAR lBody, lAfter: QbeGen.QVal; .)
+ 1592      =                                   (. QbeGen.NewLabel(lBody);
+ 1593                                             QbeGen.NewLabel(lAfter); .)
+ 1594        CaseLabel<tsel, qsel, lBody>
+ 1595        { "," CaseLabel<tsel, qsel, lBody> }
+ 1596        ":"                               (. QbeGen.Jmp(lAfter);
+ 1597                                             QbeGen.EmitLabel(lBody); .)
+ 1598        [ StatSeq ]                       (. QbeGen.Jmp(lEnd);
+ 1599                                             QbeGen.EmitLabel(lAfter); .) .
+ 1600    CaseLabel<tsel: SymTab.TypeIndex; qsel: QbeGen.QVal;
+ 1601              lBody: QbeGen.QVal>         (. VAR t2, t3: SymTab.TypeIndex;
+ 1602                                               q2, q3, qc, qd, qe:
+ 1603                                                 QbeGen.QVal;
+ 1604                                               lNext: QbeGen.QVal; .)
+ 1605      = Expr<t2, q2>                      (. IF (t2 #
+ 1606                                               SymTab.InvalidType)
+ 1607   AND (tsel #
+ 1608                                                 SymTab.InvalidType)
+ 1609   AND ((SymTab.ClassOf(t2) =
+ 1610                                                  SymTab.ClSet)
+ 1611                                                 OR (SymTab.ClassOf(tsel) =
+ 1612                                                     SymTab.ClSet)) THEN
+ 1613                                               SemError(230)
+ 1614                                             ELSIF (t2 #
+ 1615                                               SymTab.InvalidType)
+ 1616   AND (tsel #
+ 1617                                                 SymTab.InvalidType)
+ 1618   AND NOT SymTab.EqCheck(t2,
+ 1619                                                   tsel) THEN
+ 1620                                               SemError(213) END;
+ 1621                                             IF NOT QbeGen.IsImm(q2) THEN
+ 1622                                               SemError(230);
+ 1623                                               QbeGen.CopyOp("0", q2)
+ 1624                                             END;
+ 1625                                             QbeGen.NewLabel(lNext);
+ 1626                                             QbeGen.Cmp(SymTab.OpEq,
+ 1627                                               qsel, q2, qc, FALSE);
+ 1628                                             QbeGen.Jnz(qc, lBody, lNext);
+ 1629                                             QbeGen.EmitLabel(lNext); .)
+ 1630        [ ".." Expr<t3, q3>               (. IF (t3 #
+ 1631                                               SymTab.InvalidType)
+ 1632   AND (tsel #
+ 1633                                                 SymTab.InvalidType)
+ 1634   AND NOT SymTab.EqCheck(t3,
+ 1635                                                   tsel) THEN
+ 1636                                               SemError(213) END;
+ 1637                                             IF NOT QbeGen.IsImm(q3) THEN
+ 1638                                               SemError(230);
+ 1639                                               QbeGen.CopyOp("0", q3)
+ 1640                                             END;
+ 1641                                             QbeGen.Cmp(SymTab.OpGe,
+ 1642                                               qsel, q2, qc, FALSE);
+ 1643                                             QbeGen.Cmp(SymTab.OpLe,
+ 1644                                               qsel, q3, qd, FALSE);
+ 1645                                             QbeGen.NewTemp(qe);
+ 1646                                             QbeGen.Op3("and", qe, qc, qd,
+ 1647                                               FALSE);
+ 1648                                             QbeGen.NewLabel(lNext);
+ 1649                                             QbeGen.Jnz(qe, lBody, lNext);
+ 1650                                             QbeGen.EmitLabel(lNext); .) ] .
+ 1651    ReturnStat                            (. VAR t: SymTab.TypeIndex;
+ 1652                                               q, qt: QbeGen.QVal;
+ 1653                                               res: SymTab.TypeIndex;
+ 1654                                               hadE, conv: BOOLEAN; .)
+ 1655      = "RETURN"                          (. hadE := FALSE; .)
+ 1656        [ Expr<t, q>                      (. hadE := TRUE; .) ]
+ 1657                                          (. conv := FALSE;
+ 1658                                             IF NOT SymTab.InProc() THEN
+ 1659                                               SemError(232)
+ 1660                                             ELSE res := SymTab.CurRes();
+ 1661                                               IF NOT hadE THEN
+ 1662                                                 IF res #
+ 1663                                                    SymTab.InvalidType THEN
+ 1664                                                   SemError(232)
+ 1665                                                 ELSE QbeGen.EmitRet(q,
+ 1666                                                   FALSE)
+ 1667                                                 END
+ 1668                                               ELSIF (res =
+ 1669                                                      SymTab.InvalidType)
+ 1670                                                  OR (t #
+ 1671                                                      SymTab.InvalidType)
+ 1672   AND NOT SymTab.Assignable(t,
+ 1673                                                       res) THEN
+ 1674                                                 SemError(232)
+ 1675                                               ELSE
+ 1676                                                 conv := (SymTab.ClassOf(
+ 1677                                                   res) = SymTab.ClReal)
+ 1678   AND SymTab.IsIntFamily(t);
+ 1679                                                 IF conv THEN
+ 1680                                                   QbeGen.ConvIR(q, qt);
+ 1681                                                   QbeGen.EmitRet(qt, TRUE)
+ 1682                                                 ELSE QbeGen.EmitRet(q, TRUE)
+ 1683                                                 END
+ 1684                                               END
+ 1685                                             END; .) .
+ 1686    HaltStat                              (. VAR t: SymTab.TypeIndex;
+ 1687                                               q: QbeGen.QVal; .)
+ 1688      = "HALT" [ "(" Expr<t, q> ")" ]     (. QbeGen.HaltQ; .) .
+ 1689    (* Designator: scalar loads, array addresses, and index suffixes.
+ 1690       Each index descends one level (bounds-checked, trap on breach);
+ 1691       nested levels reload the inner descriptor address. q ends as the
+ 1692       value (scalars), the descriptor address (plain arrays), or the
+ 1693       element address (indexed); sfx marks the indexed form. *)
+ 1694    Design<VAR t: SymTab.TypeIndex; VAR k: INTEGER;
+ 1695           VAR q: QbeGen.QVal; VAR qn: SymTab.Name; VAR sfx: BOOLEAN>
+ 1696                                          (. VAR n, fn, mal: SymTab.Name;
+ 1697                                               cls: INTEGER;
+ 1698                                               ic: SymTab.TypeIndex;
+ 1699                                               curT, it, eT, bt:
+ 1700                                                 SymTab.TypeIndex;
+ 1701                                               iq, ql, qlo, qhi, qe:
+ 1702                                                 QbeGen.QVal;
+ 1703                                               lo, hi: INTEGER;
+ 1704                                               fo: INTEGER;
+ 1705                                               isOpen: BOOLEAN;
+ 1706                                               qb, cv: QbeGen.QVal; .)
+ 1707      = GetIdent<n>                       (. methCls := SymTab.InvalidType;
+ 1708                                             QbeGen.CopyOp(n, qn);
+ 1709                                             sfx := FALSE;
+ 1710                                             IF NOT SymTab.Lookup(n) THEN
+ 1711                                               (* a bare method name inside
+ 1712                                                  a CLASS IMPLEMENTATION
+ 1713                                                  is a sibling call on
+ 1714                                                  THIS *)
+ 1715                                               ic := SymTab.CurImplClass();
+ 1716                                               IF (ic #
+ 1717                                                  SymTab.InvalidType)
+ 1718    AND SymTab.MethodExists(ic, n) THEN
+ 1719                                                 sfx := FALSE;
+ 1720                                                 QbeGen.ThisBase(q);
+ 1721                                                 QbeGen.ArmRecv(q);
+ 1722                                                 methCls := ic;
+ 1723                                                 k := SymTab.KindProc;
+ 1724                                                 t := SymTab.InvalidType
+ 1725                                               ELSE
+ 1726                                                 SemError(201);
+ 1727                                                 t :=
+ 1728                                                   SymTab.InvalidType;
+ 1729                                                 k := -1;
+ 1730                                                 QbeGen.CopyOp("0", q)
+ 1731                                               END
+ 1732                                             ELSE
+ 1733                                               t := SymTab.SymType(n);
+ 1734                                               k := SymTab.SymKind(n);
+ 1735                                               IF k = SymTab.KindConst THEN
+ 1736                                                 IF SymTab.Equal(n,
+ 1737                                                    "TRUE") THEN
+ 1738                                                   t := SymTab.BoolType();
+ 1739                                                   QbeGen.CopyOp("1", q)
+ 1740                                                 ELSIF SymTab.Equal(n,
+ 1741                                                    "FALSE") THEN
+ 1742                                                   t := SymTab.BoolType();
+ 1743                                                   QbeGen.CopyOp("0", q)
+ 1744                                                 ELSIF SymTab.Equal(n,
+ 1745                                                    "NIL") THEN
+ 1746                                                   QbeGen.CopyOp("0", q)
+ 1747                                                 ELSE
+ 1748                                                   cls :=
+ 1749                                                     SymTab.ClassOf(t);
+ 1750                                                   IF (t #
+ 1751                                                       SymTab.InvalidType)
+ 1752   AND ((cls = SymTab.ClInt)
+ 1753                                                      OR (cls
+ 1754                                                          = SymTab.ClChar)
+ 1755                                                      OR (cls
+ 1756                                                          = SymTab.ClEnum)
+ 1757                                                      OR (cls
+ 1758                                                          = SymTab.ClReal)
+ 1759                                                      OR (cls
+ 1760                                                          = SymTab.ClLong)
+ 1761                                                      OR (cls
+ 1762                                                          = SymTab.ClNil)) THEN
+ 1763                                                     IF cls = SymTab.ClNil THEN
+ 1764                                                       QbeGen.CopyOp("0", q)
+ 1765                                                     ELSIF ((cls
+ 1766                                                         = SymTab.ClInt)
+ 1767                                                       OR (cls
+ 1768                                                         = SymTab.ClChar)
+ 1769                                                       OR (cls
+ 1770                                                         = SymTab.ClEnum)
+ 1771                                                       OR (cls
+ 1772                                                         = SymTab.ClLong))
+ 1773    AND SymTab.GetSymVal(n, cv)
+ 1774    AND QbeGen.IsImm(cv) THEN
+ 1775                                                       QbeGen.CopyOp(cv, q)
+ 1776                                                     ELSE
+ 1777                                                       QbeGen.LoadVar(n,
+ 1778                                                         cls = SymTab.ClReal,
+ 1779                                                         q)
+ 1780                                                     END
+ 1781                                                   ELSIF (cls = SymTab.ClArray)
+ 1782                                                      OR (cls = SymTab.ClRecord)
+ 1783                                                      OR (cls = SymTab.ClClass)
+ 1784                                                      OR (cls = SymTab.ClStr)
+ 1785                                                      OR (cls = SymTab.ClUStr) THEN
+ 1786                                                     (* aggregate constant:
+ 1787                                                        its value IS the
+ 1788                                                        descriptor address *)
+ 1789                                                     IF SymTab.GetSymVal(n, cv) THEN
+ 1790                                                       QbeGen.CopyOp(cv, q)
+ 1791                                                     ELSE
+ 1792                                                       QbeGen.CopyOp("0", q)
+ 1793                                                     END
+ 1794                                                   ELSE
+ 1795                                                     IF t #
+ 1796                                                        SymTab.InvalidType THEN
+ 1797                                                       SemError(230)
+ 1798                                                     END;
+ 1799                                                     QbeGen.CopyOp("0", q)
+ 1800                                                   END
  1801                                                 END
- 1802                                               ELSE QbeGen.CopyOp("0", q);
- 1803                                                 IF k = SymTab.KindImport THEN
- 1804                                                   SemError(230)
- 1805                                                 ELSIF k =
- 1806                                                    SymTab.KindProc THEN
- 1807                                                   (* bare procedure name:
- 1808                                                      a following ArgList
- 1809                                                      makes it a call;
- 1810                                                      otherwise Fact
- 1811                                                      reports 230 *)
- 1812                                                 ELSE
- 1813                                                   IF k = SymTab.KindField THEN
- 1814                                                     IF QbeGen.TopWith(qb) THEN
- 1815                                                       fo :=
- 1816                                                         SymTab.FieldOffset(
- 1817                                                         SymTab.FieldOwner(n),
- 1818                                                         n);
- 1819                                                       QbeGen.FieldAddr(qb,
- 1820                                                         fo, q);
- 1821                                                       sfx := TRUE
- 1822                                                     ELSE SemError(230);
- 1823                                                       QbeGen.CopyOp("0", q)
- 1824                                                     END
- 1825                                                   END
- 1826                                                 END
- 1827                                               END
- 1828                                             END; .)
- 1829        { "[" Expr<it, iq>
- 1830                                          (. IF t = SymTab.InvalidType THEN
- 1831                                             ELSIF SymTab.ClassOf(t) #
- 1832                                                   SymTab.ClArray THEN
- 1833                                               SemError(217);
- 1834                                               t := SymTab.InvalidType
- 1835                                             ELSIF NOT SymTab.IsIntFamily(it)
- 1836   AND (SymTab.ClassOf(it) #
- 1837                                                   SymTab.ClChar)
- 1838   AND (SymTab.ClassOf(it) #
- 1839                                                   SymTab.ClEnum) THEN
- 1840                                               SemError(218);
- 1841                                               t := SymTab.InvalidType
- 1842                                             ELSE
- 1843                                               QbeGen.WidenIndex(iq, ql);
- 1844                                               isOpen :=
- 1845                                                 SymTab.IsOpenArray(t);
- 1846                                               IF isOpen THEN
- 1847                                                 QbeGen.CopyOp("0", qlo);
- 1848                                                 IF SymTab.IsCharArray(t)
- 1849    OR SymTab.IsUCharArray(t) THEN
- 1850                                                   QbeGen.OpenHiChar(q, qhi)
- 1851                                                 ELSE QbeGen.OpenHi(q, qhi)
- 1852                                                 END
- 1853                                               ELSE
- 1854                                                 lo := SymTab.ArrayLo(t);
- 1855                                                 hi := SymTab.ArrayHi(t);
- 1856                                                 IF SymTab.IsCharArray(t)
- 1857    OR SymTab.IsUCharArray(t) THEN
- 1858                                                   hi := hi + 1
- 1859                                                 END;
- 1860                                                 QbeGen.IntStr(lo, qlo);
- 1861                                                 QbeGen.IntStr(hi, qhi)
- 1862                                               END;
- 1863                                               QbeGen.CheckRange(ql, qlo,
- 1864                                                 qhi);
- 1865                                               eT := SymTab.ArrayElem(t);
- 1866                                               QbeGen.ElemAddr(q, ql, qlo,
- 1867                                                 t, qe);
- 1868                                               IF SymTab.ClassOf(eT) =
- 1869                                                  SymTab.ClArray THEN
- 1870                                                 QbeGen.ElemLoad(qe, eT, q)
- 1871                                               ELSE QbeGen.CopyOp(qe, q)
- 1872                                               END;
- 1873                                               t := eT; sfx := TRUE
- 1874                                             END; .)
- 1875          { "," Expr<it, iq>
- 1876                                          (. IF t = SymTab.InvalidType THEN
- 1877                                             ELSIF SymTab.ClassOf(t) #
- 1878                                                   SymTab.ClArray THEN
- 1879                                               SemError(217);
- 1880                                               t := SymTab.InvalidType
- 1881                                             ELSIF NOT SymTab.IsIntFamily(it)
- 1882   AND (SymTab.ClassOf(it) #
- 1883                                                   SymTab.ClChar)
- 1884   AND (SymTab.ClassOf(it) #
- 1885                                                   SymTab.ClEnum) THEN
- 1886                                               SemError(218);
- 1887                                               t := SymTab.InvalidType
- 1888                                             ELSE
- 1889                                               QbeGen.WidenIndex(iq, ql);
- 1890                                               isOpen :=
- 1891                                                 SymTab.IsOpenArray(t);
- 1892                                               IF isOpen THEN
- 1893                                                 QbeGen.CopyOp("0", qlo);
- 1894                                                 IF SymTab.IsCharArray(t)
- 1895    OR SymTab.IsUCharArray(t) THEN
- 1896                                                   QbeGen.OpenHiChar(q, qhi)
- 1897                                                 ELSE QbeGen.OpenHi(q, qhi)
- 1898                                                 END
- 1899                                               ELSE
- 1900                                                 lo := SymTab.ArrayLo(t);
- 1901                                                 hi := SymTab.ArrayHi(t);
- 1902                                                 IF SymTab.IsCharArray(t)
- 1903    OR SymTab.IsUCharArray(t) THEN
- 1904                                                   hi := hi + 1
- 1905                                                 END;
- 1906                                                 QbeGen.IntStr(lo, qlo);
- 1907                                                 QbeGen.IntStr(hi, qhi)
- 1908                                               END;
- 1909                                               QbeGen.CheckRange(ql, qlo,
- 1910                                                 qhi);
- 1911                                               eT := SymTab.ArrayElem(t);
- 1912                                               QbeGen.ElemAddr(q, ql, qlo,
- 1913                                                 t, qe);
- 1914                                               IF SymTab.ClassOf(eT) =
- 1915                                                  SymTab.ClArray THEN
- 1916                                                 QbeGen.ElemLoad(qe, eT, q)
- 1917                                               ELSE QbeGen.CopyOp(qe, q)
- 1918                                               END;
- 1919                                               t := eT; sfx := TRUE
- 1920                                             END; .) }
- 1921          "]"
- 1922        | "." GetIdent<fn>
- 1923                                          (. IF k = SymTab.KindModule THEN
- 1924                                               (* qualified L.x: materialize
- 1925                                                  the export, then load it *)
- 1926                                               IF NOT SymTab.MaterializeAlias(n,
- 1927                                                    fn, mal) THEN
- 1928                                                 SemError(201);
- 1929                                                 t := SymTab.InvalidType;
- 1930                                                 QbeGen.CopyOp("0", q)
+ 1802                                               ELSIF (k = SymTab.KindVar)
+ 1803                                                  OR (k = SymTab.KindParam) THEN
+ 1804                                                 cls :=
+ 1805                                                   SymTab.ClassOf(t);
+ 1806                                                 IF (cls = SymTab.ClInt)
+ 1807                                                    OR (cls = SymTab.ClBool)
+ 1808                                                    OR (cls = SymTab.ClChar)
+ 1809                                                    OR (cls = SymTab.ClUChar)
+ 1810                                                    OR (cls = SymTab.ClEnum)
+ 1811                                                    OR (cls
+ 1812                                                        = SymTab.ClReal) THEN
+ 1813                                                   QbeGen.LoadVar(n,
+ 1814                                                     cls = SymTab.ClReal, q)
+ 1815                                                 ELSIF (cls = SymTab.ClPtr)
+ 1816                                                    OR (cls = SymTab.ClProc) THEN
+ 1817                                                   QbeGen.LoadPtr(n, q)
+ 1818                                                 ELSIF cls = SymTab.ClLong THEN
+ 1819                                                   QbeGen.LoadLong(n, q)
+ 1820                                                 ELSIF (cls
+ 1821                                                         = SymTab.ClArray)
+ 1822                                                    OR (cls
+ 1823                                                        = SymTab.ClSet)
+ 1824                                                    OR (cls
+ 1825                                                        = SymTab.ClRecord)
+ 1826                                                    OR (cls
+ 1827                                                        = SymTab.ClUStr)
+ 1828                                                    OR (cls
+ 1829                                                        = SymTab.ClClass) THEN
+ 1830                                                   QbeGen.AddrOf(n, q)
+ 1831                                                 ELSE SemError(230);
+ 1832                                                   QbeGen.CopyOp("0", q)
+ 1833                                                 END
+ 1834                                               ELSE QbeGen.CopyOp("0", q);
+ 1835                                                 IF k = SymTab.KindImport THEN
+ 1836                                                   SemError(230)
+ 1837                                                 ELSIF k =
+ 1838                                                    SymTab.KindProc THEN
+ 1839                                                   (* bare procedure name:
+ 1840                                                      a following ArgList
+ 1841                                                      makes it a call;
+ 1842                                                      otherwise Fact
+ 1843                                                      reports 230 *)
+ 1844                                                 ELSE
+ 1845                                                   IF k = SymTab.KindField THEN
+ 1846                                                     IF QbeGen.TopWith(qb) THEN
+ 1847                                                       fo :=
+ 1848                                                         SymTab.FieldOffset(
+ 1849                                                         SymTab.FieldOwner(n),
+ 1850                                                         n);
+ 1851                                                       QbeGen.FieldAddr(qb,
+ 1852                                                         fo, q);
+ 1853                                                       sfx := TRUE
+ 1854                                                     ELSE SemError(230);
+ 1855                                                       QbeGen.CopyOp("0", q)
+ 1856                                                     END
+ 1857                                                   END
+ 1858                                                 END
+ 1859                                               END
+ 1860                                             END; .)
+ 1861        { "[" Expr<it, iq>
+ 1862                                          (. IF t = SymTab.InvalidType THEN
+ 1863                                             ELSIF SymTab.ClassOf(t) #
+ 1864                                                   SymTab.ClArray THEN
+ 1865                                               SemError(217);
+ 1866                                               t := SymTab.InvalidType
+ 1867                                             ELSIF NOT SymTab.IsIntFamily(it)
+ 1868   AND (SymTab.ClassOf(it) #
+ 1869                                                   SymTab.ClChar)
+ 1870   AND (SymTab.ClassOf(it) #
+ 1871                                                   SymTab.ClEnum) THEN
+ 1872                                               SemError(218);
+ 1873                                               t := SymTab.InvalidType
+ 1874                                             ELSE
+ 1875                                               QbeGen.WidenIndex(iq, ql);
+ 1876                                               isOpen :=
+ 1877                                                 SymTab.IsOpenArray(t);
+ 1878                                               IF isOpen THEN
+ 1879                                                 QbeGen.CopyOp("0", qlo);
+ 1880                                                 IF SymTab.IsCharArray(t)
+ 1881    OR SymTab.IsUCharArray(t) THEN
+ 1882                                                   QbeGen.OpenHiChar(q, qhi)
+ 1883                                                 ELSE QbeGen.OpenHi(q, qhi)
+ 1884                                                 END
+ 1885                                               ELSE
+ 1886                                                 lo := SymTab.ArrayLo(t);
+ 1887                                                 hi := SymTab.ArrayHi(t);
+ 1888                                                 IF SymTab.IsCharArray(t)
+ 1889    OR SymTab.IsUCharArray(t) THEN
+ 1890                                                   hi := hi + 1
+ 1891                                                 END;
+ 1892                                                 QbeGen.IntStr(lo, qlo);
+ 1893                                                 QbeGen.IntStr(hi, qhi)
+ 1894                                               END;
+ 1895                                               QbeGen.CheckRange(ql, qlo,
+ 1896                                                 qhi);
+ 1897                                               eT := SymTab.ArrayElem(t);
+ 1898                                               QbeGen.ElemAddr(q, ql, qlo,
+ 1899                                                 t, qe);
+ 1900                                               IF SymTab.ClassOf(eT) =
+ 1901                                                  SymTab.ClArray THEN
+ 1902                                                 QbeGen.ElemLoad(qe, eT, q)
+ 1903                                               ELSE QbeGen.CopyOp(qe, q)
+ 1904                                               END;
+ 1905                                               t := eT; sfx := TRUE
+ 1906                                             END; .)
+ 1907          { "," Expr<it, iq>
+ 1908                                          (. IF t = SymTab.InvalidType THEN
+ 1909                                             ELSIF SymTab.ClassOf(t) #
+ 1910                                                   SymTab.ClArray THEN
+ 1911                                               SemError(217);
+ 1912                                               t := SymTab.InvalidType
+ 1913                                             ELSIF NOT SymTab.IsIntFamily(it)
+ 1914   AND (SymTab.ClassOf(it) #
+ 1915                                                   SymTab.ClChar)
+ 1916   AND (SymTab.ClassOf(it) #
+ 1917                                                   SymTab.ClEnum) THEN
+ 1918                                               SemError(218);
+ 1919                                               t := SymTab.InvalidType
+ 1920                                             ELSE
+ 1921                                               QbeGen.WidenIndex(iq, ql);
+ 1922                                               isOpen :=
+ 1923                                                 SymTab.IsOpenArray(t);
+ 1924                                               IF isOpen THEN
+ 1925                                                 QbeGen.CopyOp("0", qlo);
+ 1926                                                 IF SymTab.IsCharArray(t)
+ 1927    OR SymTab.IsUCharArray(t) THEN
+ 1928                                                   QbeGen.OpenHiChar(q, qhi)
+ 1929                                                 ELSE QbeGen.OpenHi(q, qhi)
+ 1930                                                 END
  1931                                               ELSE
- 1932                                                 QbeGen.CopyOp(mal, qn);
- 1933                                                 t := SymTab.SymType(mal);
- 1934                                                 k := SymTab.SymKind(mal);
- 1935                                                 sfx := FALSE;
- 1936                                                 IF k = SymTab.KindProc THEN
- 1937                                                   (* call: ArgList supplies
- 1938                                                      the value *)
- 1939                                                   QbeGen.CopyOp("0", q)
- 1940                                                 ELSIF NOT QbeGen.LoadDesignator(
- 1941                                                      mal, t, k, q) THEN
- 1942                                                   SemError(230);
- 1943                                                   QbeGen.CopyOp("0", q)
- 1944                                                 END
- 1945                                               END
- 1946                                             ELSIF t = SymTab.InvalidType THEN
- 1947                                             ELSIF (SymTab.ClassOf(t) #
- 1948                                                    SymTab.ClRecord)
- 1949   AND (SymTab.ClassOf(t) #
- 1950                                                   SymTab.ClClass) THEN
- 1951                                               SemError(215);
- 1952                                               t := SymTab.InvalidType
- 1953                                             ELSIF (SymTab.ClassOf(t) =
- 1954                                                    SymTab.ClClass)
- 1955    AND SymTab.MethodExists(t, fn) THEN
- 1956                                               (* obj.Method: bind the
- 1957                                                  method and pass obj as
- 1958                                                  the hidden receiver; q
- 1959                                                  already holds the
- 1960                                                  object's address *)
- 1961                                               QbeGen.ArmRecv(q);
- 1962                                               QbeGen.CopyOp(fn, n);
- 1963                                               QbeGen.CopyOp(fn, qn);
- 1964                                               methCls := t;
- 1965                                               k := SymTab.KindProc;
- 1966                                               t := SymTab.InvalidType
- 1967                                             ELSIF NOT SymTab.FieldExists(t,
- 1968                                                      fn) THEN
- 1969                                               SemError(216);
- 1970                                               t := SymTab.InvalidType
- 1971                                             ELSE
- 1972                                               fo := SymTab.FieldOffset(t,
- 1973                                                 fn);
- 1974                                               t := SymTab.FieldType(t, fn);
- 1975                                               QbeGen.FieldAddr(q, fo, qe);
- 1976                                               (* array fields are inline:
- 1977                                                  the field address is the
- 1978                                                  descriptor, like records *)
- 1979                                               QbeGen.CopyOp(qe, q);
- 1980                                               sfx := TRUE
- 1981                                             END; .)
- 1982        | "^"
- 1983                                          (. IF t = SymTab.InvalidType THEN
- 1984                                             ELSIF SymTab.ClassOf(t) #
- 1985                                                   SymTab.ClPtr THEN
- 1986                                               SemError(219);
- 1987                                               t := SymTab.InvalidType
- 1988                                             ELSE
- 1989                                               bt := SymTab.PtrBase(t);
- 1990                                               IF bt = SymTab.InvalidType THEN
- 1991                                               ELSE
- 1992                                                 IF sfx THEN
- 1993                                                   QbeGen.ElemLoad(q, t,
- 1994                                                     qb);
- 1995                                                   QbeGen.CopyOp(qb, q)
- 1996                                                 END;
- 1997                                                 t := bt;
- 1998                                                 (* q holds the pointee
- 1999                                                    address: Fact loads
- 2000                                                    scalars/pointers and uses
- 2001                                                    the address for
- 2002                                                    aggregates; the VAR-actual
- 2003                                                    note is q itself. *)
- 2004                                                 sfx := TRUE
- 2005                                               END
- 2006                                             END; .) } .
- 2007    Expr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2008                                          (. VAR t2: SymTab.TypeIndex;
- 2009                                               op: INTEGER;
- 2010                                               q2, qt, wl: QbeGen.QVal;
- 2011                                               isR: BOOLEAN; .)
- 2012      = SimExpr<t, q>
- 2013        [ Rel<op> SimExpr<t2, q2>
- 2014          (. IF op = SymTab.OpIn THEN
- 2015               IF SymTab.InCheck(t, t2) THEN
- 2016                 IF (t = SymTab.InvalidType)
- 2017                    OR (t2 = SymTab.InvalidType) THEN
- 2018                   t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
- 2019                 ELSE
- 2020                   QbeGen.InSet(q, q2, SymTab.SetBaseLo(t2),
- 2021                     SymTab.SetCount(t2), qt);
- 2022                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2023                 END
- 2024               ELSE SemError(222); t := SymTab.InvalidType;
- 2025                 QbeGen.CopyOp("0", q)
- 2026               END
- 2027             ELSIF SymTab.RelCheck(t, t2, op) THEN
- 2028               IF (t = SymTab.InvalidType)
- 2029                  OR (t2 = SymTab.InvalidType) THEN
- 2030                 t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
- 2031               ELSIF (SymTab.ClassOf(t) = SymTab.ClPtr)
- 2032                  OR (SymTab.ClassOf(t2) = SymTab.ClPtr) THEN
- 2033                 IF (op # SymTab.OpEq) AND (op # SymTab.OpNeq1)
- 2034   AND (op # SymTab.OpNeq2) THEN
- 2035                   SemError(213); t := SymTab.InvalidType;
- 2036                   QbeGen.CopyOp("0", q)
- 2037                 ELSE
- 2038                   QbeGen.CmpL(op, q, q2, qt);
- 2039                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2040                 END
- 2041               ELSIF (SymTab.ClassOf(t) = SymTab.ClSet)
- 2042                  OR (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2043                 QbeGen.CmpSet(op, q, q2,
- 2044                   SymTab.SetWords(t), SymTab.SetWords(t2), qt);
- 2045                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2046               ELSIF SymTab.StrCompat(t, t2) THEN
- 2047                 QbeGen.StrEq(op, q, q2, qt);
- 2048                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2049               ELSIF SymTab.IsLongFamily(t)
- 2050                  OR SymTab.IsLongFamily(t2) THEN
- 2051                 IF SymTab.IsIntFamily(t) THEN
- 2052                   QbeGen.WidenLong(q, wl); QbeGen.CopyOp(wl, q)
- 2053                 END;
- 2054                 IF SymTab.IsIntFamily(t2) THEN
- 2055                   QbeGen.WidenLong(q2, wl); QbeGen.CopyOp(wl, q2)
- 2056                 END;
- 2057                 QbeGen.CmpLong(op, q, q2, qt);
- 2058                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
- 2059               ELSE
- 2060                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2061                 t := SymTab.BoolType();
- 2062                 QbeGen.Cmp(op, q, q2, qt, isR);
- 2063                 QbeGen.CopyOp(qt, q)
- 2064               END
- 2065             ELSE SemError(213); t := SymTab.InvalidType;
- 2066               QbeGen.CopyOp("0", q)
- 2067             END; .) ] .
- 2068    Rel<VAR op: INTEGER>
- 2069      = "="                               (. op := SymTab.OpEq; .)
- 2070      | "#"                               (. op := SymTab.OpNeq1; .)
- 2071      | "<"                               (. op := SymTab.OpLt; .)
- 2072      | "<="                              (. op := SymTab.OpLe; .)
- 2073      | ">"                               (. op := SymTab.OpGt; .)
- 2074      | ">="                              (. op := SymTab.OpGe; .)
- 2075      | "IN"                              (. op := SymTab.OpIn; .) .
- 2076    SimExpr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2077                                          (. VAR t2, res2, lt, rt:
- 2078                                                 SymTab.TypeIndex;
- 2079                                               op: INTEGER;
- 2080                                               q2, qt, wq, qf, q2a, q2b:
- 2081                                                 QbeGen.QVal;
- 2082                                               neg, isR, isL, folded:
- 2083                                                 BOOLEAN;
- 2084                                               fok: BOOLEAN;
- 2085                                               lw, rw, mw: CARDINAL;
- 2086                                               lTrue, lNext, lDone, qr, qs:
- 2087                                                 QbeGen.QVal; .)
- 2088      =                                   (. neg := FALSE; .)
- 2089        [ "+" | "-"                       (. neg := TRUE; .) ]
- 2090        Term<t, q>                        (. IF neg THEN
- 2091                                             IF QbeGen.IsImm(q) THEN
- 2092                                               QbeGen.NegFold(q, q)
- 2093                                             ELSE QbeGen.NewTemp(qt);
- 2094                                               QbeGen.NegQ(q, qt,
- 2095                                                 SymTab.ClassOf(t)
- 2096                                                 = SymTab.ClReal);
- 2097                                               QbeGen.CopyOp(qt, q)
- 2098                                             END
- 2099                                           END; .)
- 2100        { AddOp<op>                       (. IF op = SymTab.OpOr THEN
- 2101                                               QbeGen.DelayBegin END; .)
- 2102          Term<t2, q2>                     (. IF op = SymTab.OpOr THEN
- 2103                                               QbeGen.DelayEnd END; .)
- 2104          (. IF op = SymTab.OpOr THEN
- 2105               (* short-circuit: if q is true the RHS is skipped *)
- 2106               IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
- 2107                 t := SymTab.BoolType()
- 2108               ELSE SemError(212); t := SymTab.InvalidType END;
- 2109               IF t # SymTab.InvalidType THEN
- 2110                 QbeGen.Slot4(qs);
- 2111                 QbeGen.NewLabel(lTrue);
- 2112                 QbeGen.NewLabel(lNext);
- 2113                 QbeGen.NewLabel(lDone);
- 2114                 QbeGen.Jnz(q, lTrue, lNext);
- 2115                 QbeGen.EmitLabel(lTrue);
- 2116                 QbeGen.StoreW(qs, "1");
- 2117                 QbeGen.Jmp(lDone);
- 2118                 QbeGen.EmitLabel(lNext);
- 2119                 QbeGen.DelayFlush;
- 2120                 QbeGen.StoreW(qs, q2);
- 2121                 QbeGen.Jmp(lDone);
- 2122                 QbeGen.EmitLabel(lDone);
- 2123                 QbeGen.LoadW(qs, qr);
- 2124                 QbeGen.CopyOp(qr, q)
- 2125               ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
- 2126               END
- 2127             ELSIF (op = SymTab.OpAdd)
- 2128               AND (SymTab.UStrCompat(t, t2)
- 2129                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
- 2130                   AND (SymTab.ClassOf(t2) = SymTab.ClUStr))
- 2131                 OR ((SymTab.ClassOf(t) = SymTab.ClUStr)
- 2132                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))
- 2133                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
- 2134                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))) THEN
- 2135               (* UString concatenation: a UCHAR operand becomes a
- 2136                  1-codepoint UString; the result is a descriptor in the
- 2137                  shim's concat buffer.  Work on copies so neither
- 2138                  operand is clobbered. *)
- 2139               IF SymTab.ClassOf(t) = SymTab.ClUStr THEN
- 2140                 QbeGen.CopyOp(q, q2a)
- 2141               ELSE
- 2142                 QbeGen.UStrFrom(q, q2a)
- 2143               END;
- 2144               IF SymTab.ClassOf(t2) = SymTab.ClUStr THEN
- 2145                 QbeGen.UStrCat(q2a, q2, qt)
- 2146               ELSE
- 2147                 QbeGen.UStrFrom(q2, q2b);
- 2148                 QbeGen.UStrCat(q2a, q2b, qt)
- 2149               END;
- 2150               t := SymTab.NewUStr();
- 2151               QbeGen.CopyOp(qt, q)
- 2152             ELSIF (op = SymTab.OpAdd)
- 2153               AND (SymTab.StrCompat(t, t2)
- 2154                 OR (SymTab.IsStrType(t)
- 2155                   AND (SymTab.ClassOf(t2) = SymTab.ClChar))
- 2156                 OR ((SymTab.ClassOf(t) = SymTab.ClChar)
- 2157                   AND SymTab.IsStrType(t2))) THEN
- 2158               (* string concatenation; a CHAR operand becomes a
- 2159                  1-character string literal.  When both operands are
- 2160                  constants, fold to a single string literal so a
- 2161                  constructor element stays compile-time. *)
- 2162               QbeGen.StrFold(q, q2, SymTab.ClassOf(t), SymTab.ClassOf(t2),
- 2163                 qt, fok);
- 2164               IF NOT fok THEN
- 2165                 IF SymTab.StrCompat(t, t2) THEN
- 2166                   QbeGen.StrCat(q, q2, qt)
- 2167                 ELSIF SymTab.IsStrType(t) THEN
- 2168                   QbeGen.DeclCharStr(q2, qs);
- 2169                   QbeGen.StrCat(q, qs, qt)
- 2170                 ELSE
- 2171                   QbeGen.DeclCharStr(q, qs);
- 2172                   QbeGen.StrCat(qs, q2, qt)
- 2173                 END
- 2174               END;
- 2175               t := SymTab.NewStr();
- 2176               QbeGen.CopyOp(qt, q)
- 2177             ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
- 2178   AND (SymTab.ClassOf(t) = SymTab.ClSet)
- 2179   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2180               lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
- 2181               mw := lw;
- 2182               IF rw > mw THEN mw := rw END;
- 2183               IF op = SymTab.OpAdd THEN
- 2184                 QbeGen.SetBinOp(0, q, q2, lw, rw, qt)
- 2185               ELSE
- 2186                 QbeGen.SetBinOp(2, q, q2, lw, rw, qt)
- 2187               END;
- 2188               t := SymTab.NewSet(
- 2189                      SymTab.NewSubR(0,
- 2190                        VAL(INTEGER, mw) * 32 - 1));
- 2191               QbeGen.CopyOp(qt, q)
- 2192             ELSE
- 2193               IF SymTab.ArithCheck(t, t2, FALSE, res2) THEN
- 2194                 lt := t; rt := t2; t := res2
- 2195               ELSE SemError(211); t := SymTab.InvalidType END;
- 2196               IF t # SymTab.InvalidType THEN
- 2197                 isL := SymTab.IsLongFamily(t);
- 2198                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2199                 folded := FALSE;
- 2200                 IF (NOT isL) AND (NOT isR)
- 2201    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
- 2202                   IF op = SymTab.OpAdd THEN
- 2203                     folded := QbeGen.Fold2(0, q, q2, qf)
- 2204                   ELSE
- 2205                     folded := QbeGen.Fold2(1, q, q2, qf)
- 2206                   END
- 2207                 END;
- 2208                 IF folded THEN QbeGen.CopyOp(qf, q)
- 2209                 ELSE
- 2210                 IF isL THEN
- 2211                   IF SymTab.IsIntFamily(lt) THEN
- 2212                     QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
- 2213                   END;
- 2214                   IF SymTab.IsIntFamily(rt) THEN
- 2215                     QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
- 2216                   END;
- 2217                   QbeGen.NewTemp(qt);
- 2218                   IF op = SymTab.OpAdd THEN
- 2219                     QbeGen.Op3L("add", qt, q, q2)
- 2220                   ELSE
- 2221                     QbeGen.Op3L("sub", qt, q, q2)
- 2222                   END
- 2223                 ELSE
- 2224                   QbeGen.NewTemp(qt);
- 2225                   IF op = SymTab.OpAdd THEN
- 2226                     QbeGen.Op3("add", qt, q, q2, isR)
- 2227                   ELSE
- 2228                     QbeGen.Op3("sub", qt, q, q2, isR)
- 2229                   END
- 2230                 END;
- 2231                 QbeGen.CopyOp(qt, q)
- 2232                 END
- 2233               ELSE QbeGen.CopyOp("0", q)
- 2234               END
- 2235             END; .) } .
- 2236    AddOp<VAR op: INTEGER>
- 2237      = "+"                               (. op := SymTab.OpAdd; .)
- 2238      | "-"                               (. op := SymTab.OpSub; .)
- 2239      | "OR"                              (. op := SymTab.OpOr; .) .
- 2240    Term<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2241                                          (. VAR t2, res2, lt, rt:
- 2242                                                 SymTab.TypeIndex;
- 2243                                               op: INTEGER;
- 2244                                               q2, qt, wq, qf:
- 2245                                                 QbeGen.QVal;
- 2246                                               isR, isL, folded: BOOLEAN;
- 2247                                               lw, rw, mw: CARDINAL;
- 2248                                               lNext, lFalse, lDone, qr, qs:
- 2249                                                 QbeGen.QVal; .)
- 2250      = Fact<t, q> { MulOp<op>            (. IF op = SymTab.OpAnd THEN
- 2251                                               QbeGen.DelayBegin END; .)
- 2252          Fact<t2, q2>                    (. IF op = SymTab.OpAnd THEN
- 2253                                               QbeGen.DelayEnd END; .)
- 2254        (. IF op = SymTab.OpAnd THEN
- 2255             (* short-circuit: if q is false the RHS is skipped *)
- 2256             IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
- 2257               t := SymTab.BoolType()
- 2258             ELSE SemError(212); t := SymTab.InvalidType END;
- 2259             IF t # SymTab.InvalidType THEN
- 2260               QbeGen.Slot4(qs);
- 2261               QbeGen.NewLabel(lNext);
- 2262               QbeGen.NewLabel(lFalse);
- 2263               QbeGen.NewLabel(lDone);
- 2264               QbeGen.Jnz(q, lNext, lFalse);
- 2265               QbeGen.EmitLabel(lNext);
- 2266               QbeGen.DelayFlush;
- 2267               QbeGen.StoreW(qs, q2);
- 2268               QbeGen.Jmp(lDone);
- 2269               QbeGen.EmitLabel(lFalse);
- 2270               QbeGen.StoreW(qs, "0");
- 2271               QbeGen.Jmp(lDone);
- 2272               QbeGen.EmitLabel(lDone);
- 2273               QbeGen.LoadW(qs, qr);
- 2274               QbeGen.CopyOp(qr, q)
- 2275             ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
- 2276             END
- 2277           ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
- 2278   AND (SymTab.ClassOf(t) = SymTab.ClSet)
- 2279   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
- 2280             lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
- 2281             mw := lw;
- 2282             IF rw > mw THEN mw := rw END;
- 2283             IF op = SymTab.OpTimes THEN
- 2284               QbeGen.SetBinOp(1, q, q2, lw, rw, qt)
- 2285             ELSE
- 2286               QbeGen.SetBinOp(3, q, q2, lw, rw, qt)
- 2287             END;
- 2288             t := SymTab.NewSet(
- 2289                    SymTab.NewSubR(0,
- 2290                      VAL(INTEGER, mw) * 32 - 1));
- 2291             QbeGen.CopyOp(qt, q)
- 2292           ELSE
- 2293             IF SymTab.ArithCheck(t, t2,
- 2294                  (op = SymTab.OpDiv) OR (op = SymTab.OpMod),
- 2295                  res2) THEN
- 2296               lt := t; rt := t2; t := res2
- 2297             ELSE SemError(211); t := SymTab.InvalidType END;
- 2298             IF t # SymTab.InvalidType THEN
- 2299               isL := SymTab.IsLongFamily(t);
- 2300               isR := SymTab.ClassOf(t) = SymTab.ClReal;
- 2301               folded := FALSE;
- 2302               IF (NOT isL) AND (NOT isR)
- 2303    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
- 2304                 IF op = SymTab.OpTimes THEN
- 2305                   folded := QbeGen.Fold2(2, q, q2, qf)
- 2306                 ELSIF op = SymTab.OpDiv THEN
- 2307                   folded := QbeGen.Fold2(3, q, q2, qf)
- 2308                 ELSIF op = SymTab.OpMod THEN
- 2309                   folded := QbeGen.Fold2(4, q, q2, qf)
- 2310                 END
- 2311               END;
- 2312               IF folded THEN QbeGen.CopyOp(qf, q)
- 2313               ELSE
- 2314               IF isL THEN
- 2315                 IF SymTab.IsIntFamily(lt) THEN
- 2316                   QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
- 2317                 END;
- 2318                 IF SymTab.IsIntFamily(rt) THEN
- 2319                   QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
- 2320                 END;
- 2321                 QbeGen.NewTemp(qt);
- 2322                 IF op = SymTab.OpTimes THEN
- 2323                   QbeGen.Op3L("mul", qt, q, q2)
- 2324                 ELSIF (op = SymTab.OpDiv)
- 2325                    OR (op = SymTab.OpSlash) THEN
- 2326                   QbeGen.Op3L("div", qt, q, q2)
- 2327                 ELSE
- 2328                   QbeGen.Op3L("rem", qt, q, q2)
- 2329                 END
- 2330               ELSE
- 2331                 QbeGen.NewTemp(qt);
- 2332                 IF op = SymTab.OpTimes THEN
- 2333                   QbeGen.Op3("mul", qt, q, q2, isR)
- 2334                 ELSIF (op = SymTab.OpDiv)
- 2335                    OR (op = SymTab.OpSlash) THEN
- 2336                   QbeGen.Op3("div", qt, q, q2, isR)
- 2337                 ELSE
- 2338                   QbeGen.Op3("rem", qt, q, q2, isR)
- 2339                 END
- 2340               END;
- 2341               QbeGen.CopyOp(qt, q)
- 2342               END
- 2343             ELSE QbeGen.CopyOp("0", q)
- 2344             END
- 2345           END; .) } .
- 2346    MulOp<VAR op: INTEGER>
- 2347      = "*"                               (. op := SymTab.OpTimes; .)
- 2348      | "/"                               (. op := SymTab.OpSlash; .)
- 2349      | "DIV"                             (. op := SymTab.OpDiv; .)
- 2350      | "MOD"                             (. op := SymTab.OpMod; .)
- 2351      | ( "AND" | "&" )                   (. op := SymTab.OpAnd; .) .
- 2352    Fact<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2353                                          (. VAR s: ARRAY [0 .. 255] OF CHAR;
- 2354                                               et, dt, t2, st, ct2, et2:
- 2355                                                 SymTab.TypeIndex;
- 2356                                               dk: INTEGER;
- 2357                                               qd, q2, sq, qa, qm0, qr, qt:
- 2358                                                 QbeGen.QVal;
- 2359                                               qn, vn: SymTab.Name;
- 2360                                               vt: SymTab.TypeIndex;
- 2361                                               c1, c2: INTEGER;
- 2362                                               lo, hi: INTEGER;
- 2363                                               isMax: BOOLEAN;
- 2364                                               called, isHigh, sfx, isCh,
- 2365                                               isU, uok, isStr: BOOLEAN;
- 2366                                               ucp: INTEGER; .)
- 2367      = integer                           (. LexString(s);
- 2368                                             QbeGen.NormInt(s, q);
- 2369                                             t := SymTab.IntType(); .)
- 2370      | charConst                         (. LexString(s);
- 2371                                             QbeGen.NormLit(s, q, isCh);
- 2372                                             t := SymTab.CharType(); .)
- 2373      | real                              (. LexString(s);
- 2374                                             QbeGen.NormReal(s, q);
- 2375                                             t := SymTab.RealType(); .)
- 2376      | string                            (. LexString(s);
- 2377                                             IF SymTab.StrLen(s) = 3 THEN
- 2378                                               t := SymTab.CharType();
- 2379                                               QbeGen.IntStr(
- 2380                                                 QbeGen.CharVal(s), q)
- 2381                                             ELSE t := SymTab.NewStr();
- 2382                                               QbeGen.DeclStr(s, q);
- 2383                                               (* a literal's value IS its
- 2384                                                  static descriptor address *)
- 2385                                               QbeGen.NoteAddr(q, q)
- 2386                                             END; .)
- 2387      | ustring                           (. LexString(s);
- 2388                                             QbeGen.DeclUStr(s, q, isU, ucp,
- 2389                                               uok);
- 2390                                             IF NOT uok THEN
- 2391                                               SemError(234);
- 2392                                               t := SymTab.InvalidType
- 2393                                             ELSIF isU THEN
- 2394                                               t := SymTab.UCharType();
- 2395                                               QbeGen.IntStr(ucp, q)
- 2396                                             ELSE
- 2397                                               t := SymTab.NewUStr();
- 2398                                               QbeGen.NoteAddr(q, q)
- 2399                                             END; .)
- 2400      | Design<dt, dk, qd, qn, sfx>       (. called := FALSE;
- 2401                                             t := dt;
- 2402                                             IF sfx THEN
- 2403                                               IF dt =
- 2404                                                  SymTab.InvalidType THEN
- 2405                                                 QbeGen.CopyOp("0", q)
- 2406                                               ELSIF (SymTab.ClassOf(dt) =
- 2407                                                      SymTab.ClRecord)
- 2408                                                  OR (SymTab.ClassOf(dt) =
- 2409                                                      SymTab.ClSet)
- 2410                                                  OR (SymTab.ClassOf(dt) =
- 2411                                                      SymTab.ClArray)
- 2412                                                  OR (SymTab.ClassOf(dt) =
- 2413                                                      SymTab.ClClass) THEN
- 2414                                                 QbeGen.CopyOp(qd, q)
- 2415                                               ELSE QbeGen.ElemLoad(qd, dt,
- 2416                                                 q)
- 2417                                               END
- 2418                                             ELSE QbeGen.CopyOp(qd, q)
- 2419                                             END;
- 2420                                             IF (dk = SymTab.KindVar)
- 2421                                                OR (dk = SymTab.KindParam)
- 2422                                                OR (dk =
- 2423                                                   SymTab.KindField) THEN
- 2424                                               IF sfx THEN
- 2425                                                 QbeGen.NoteAddr(q, qd)
- 2426                                               ELSE
- 2427                                                 QbeGen.AddrOf(qn, qa);
- 2428                                                 QbeGen.NoteAddr(q, qa)
- 2429                                               END
- 2430                                             ELSIF sfx
- 2431   AND (dt #
- 2432                                                   SymTab.InvalidType)
- 2433   AND ((SymTab.ClassOf(dt) =
- 2434                                                    SymTab.ClArray)
- 2435                                                   OR (SymTab.ClassOf(dt) =
- 2436                                                       SymTab.ClSet)
- 2437                                                   OR (SymTab.ClassOf(dt) =
- 2438                                                       SymTab.ClRecord)) THEN
- 2439                                               QbeGen.NoteAddr(qd, qd)
- 2440                                             END; .)
- 2441        [ TypedBraceLit<dt, q>            (. t := dt; .) ]
- 2442        [ ArgList<qn, dt, qd, TRUE, methCls, ct2, q2, called>
- 2443                                          (. t := ct2;
- 2444                                             QbeGen.CopyOp(q2, q); .) ]
- 2445                                          (. IF NOT called
- 2446   AND (dk = SymTab.KindProc) THEN
- 2447                                               (* bare zero-arg function
- 2448                                                  call (parentheses may be
- 2449                                                  omitted); a proper or
- 2450                                                  parameterised proc here
- 2451                                                  is 230 *)
- 2452                                               IF (SymTab.ProcNPar(qn) = 0)
- 2453   AND (SymTab.ProcRes(qn) #
- 2454                                                     SymTab.InvalidType) THEN
- 2455                                                 QbeGen.Mangled(qn,
- 2456                                                   SymTab.ProcUid(qn), qm0);
- 2457                                                 QbeGen.CallBegin(qm0,
- 2458                                                   SymTab.ProcRes(qn),
- 2459                                                   SymTab.ProcDepthOf(qn),
- 2460                                                   SymTab.IsExternal(qn));
- 2461                                                 QbeGen.CallEnd(TRUE, q);
- 2462                                                 t := SymTab.ProcRes(qn)
- 2463                                               ELSE
- 2464                                                 (* procedure used as a
- 2465                                                    value (assign to a
- 2466                                                    procedure variable):
- 2467                                                    its code address *)
- 2468                                                 t := SymTab.ProcTypeOf(qn);
- 2469                                                 QbeGen.Mangled(qn,
- 2470                                                   SymTab.ProcUid(qn), qm0);
- 2471                                                 QbeGen.ProcAddr(qm0, q)
- 2472                                               END
- 2473                                             END; .)
- 2474      | ( "HIGH"                          (. isHigh := TRUE; .)
- 2475        | ( "LEN" | "LENGTH" )            (. isHigh := FALSE; .) )
- 2476        "(" ( Design<dt, dk, qd, qn, sfx> (. isStr := FALSE;
- 2477                                              isU := FALSE; .)
- 2478            | string                       (. LexString(s);
- 2479                                              isStr := TRUE;
- 2480                                              isU := FALSE;
- 2481                                              IF SymTab.StrLen(s) = 3 THEN
- 2482                                                dt := SymTab.CharType();
- 2483                                                QbeGen.IntStr(QbeGen.CharVal(s),
- 2484                                                  qd)
- 2485                                              ELSE
- 2486                                                dt := SymTab.NewStr();
- 2487                                                QbeGen.DeclStr(s, qd);
- 2488                                                QbeGen.NoteAddr(qd, qd)
- 2489                                              END;
- 2490                                              dk := -1;
- 2491                                              qn[0] := CHR(0); .)
- 2492            | ustring                      (. LexString(s);
- 2493                                              QbeGen.DeclUStr(s, qd, isU, ucp,
- 2494                                                uok);
- 2495                                              isStr := FALSE;
- 2496                                              IF NOT uok THEN
- 2497                                                SemError(234);
- 2498                                                dt := SymTab.InvalidType
- 2499                                              ELSIF isU THEN
- 2500                                                (* one codepoint: a UCHAR;
- 2501                                                   LEN is 1, HIGH is 0 *)
- 2502                                                dt := SymTab.UCharType();
- 2503                                                QbeGen.IntStr(ucp, qd)
- 2504                                              ELSE
- 2505                                                dt := SymTab.NewUStr();
- 2506                                                QbeGen.NoteAddr(qd, qd)
- 2507                                              END;
- 2508                                              dk := -1;
- 2509                                              qn[0] := CHR(0); .) )
- 2510        ")"
- 2511                                          (. IF (dt # SymTab.InvalidType)
- 2512    AND (SymTab.ClassOf(dt) = SymTab.ClUStr) THEN
- 2513                                               (* UString: the count is
- 2514                                                  the descriptor header *)
- 2515                                               IF isHigh THEN
- 2516                                                 QbeGen.UStrLen(qd, qr);
- 2517                                                 QbeGen.DecQ(qr)
- 2518                                               ELSE
- 2519                                                 QbeGen.UStrLen(qd, qr)
- 2520                                               END;
- 2521                                               t := SymTab.IntType();
- 2522                                               QbeGen.CopyOp(qr, q)
- 2523                                             ELSIF (dt # SymTab.InvalidType)
- 2524    AND (SymTab.ClassOf(dt) = SymTab.ClUChar) THEN
- 2525                                               (* single UCHAR codepoint *)
- 2526                                               IF isHigh THEN
- 2527                                                 QbeGen.CopyOp("0", qr)
- 2528                                               ELSE
- 2529                                                 QbeGen.CopyOp("1", qr)
- 2530                                               END;
- 2531                                               t := SymTab.IntType();
- 2532                                               QbeGen.CopyOp(qr, q)
- 2533                                             ELSIF isStr THEN
- 2534                                               (* fold: content length at
- 2535                                                  compile time *)
- 2536                                               IF SymTab.StrLen(s) = 3 THEN
- 2537                                                 c1 := 1
- 2538                                               ELSE
- 2539                                                 c1 :=
- 2540                                                   SymTab.StrLen(s) - 2
- 2541                                               END;
- 2542                                               IF isHigh THEN
- 2543                                                 DEC(c1)
- 2544                                               END;
- 2545                                               QbeGen.IntStr(c1, qr);
- 2546                                               t := SymTab.IntType();
- 2547                                               QbeGen.CopyOp(qr, q)
- 2548                                             ELSIF dt = SymTab.InvalidType THEN
- 2549                                               t := SymTab.InvalidType;
- 2550                                               QbeGen.CopyOp("0", q)
- 2551                                             ELSIF SymTab.ClassOf(dt) #
- 2552                                                   SymTab.ClArray THEN
- 2553                                               SemError(217);
- 2554                                               t := SymTab.InvalidType;
- 2555                                               QbeGen.CopyOp("0", q)
- 2556                                             ELSE
- 2557                                               IF isHigh THEN
- 2558                                                 IF SymTab.IsOpenArray(dt) THEN
- 2559                                                   QbeGen.OpenHi(qd, qr)
- 2560                                                 ELSE
- 2561                                                   QbeGen.IntStr(
- 2562                                                     SymTab.ArrayHi(dt), qr)
- 2563                                                 END
- 2564                                               ELSE
- 2565                                                 IF SymTab.IsOpenArray(dt) THEN
- 2566                                                   QbeGen.LoadCount(qd, qr)
- 2567                                                 ELSE
- 2568                                                   QbeGen.IntStr(VAL(
- 2569                                                     INTEGER,
- 2570                                                     SymTab.ArrayLen(dt)),
- 2571                                                     qr)
- 2572                                                 END
+ 1932                                                 lo := SymTab.ArrayLo(t);
+ 1933                                                 hi := SymTab.ArrayHi(t);
+ 1934                                                 IF SymTab.IsCharArray(t)
+ 1935    OR SymTab.IsUCharArray(t) THEN
+ 1936                                                   hi := hi + 1
+ 1937                                                 END;
+ 1938                                                 QbeGen.IntStr(lo, qlo);
+ 1939                                                 QbeGen.IntStr(hi, qhi)
+ 1940                                               END;
+ 1941                                               QbeGen.CheckRange(ql, qlo,
+ 1942                                                 qhi);
+ 1943                                               eT := SymTab.ArrayElem(t);
+ 1944                                               QbeGen.ElemAddr(q, ql, qlo,
+ 1945                                                 t, qe);
+ 1946                                               IF SymTab.ClassOf(eT) =
+ 1947                                                  SymTab.ClArray THEN
+ 1948                                                 QbeGen.ElemLoad(qe, eT, q)
+ 1949                                               ELSE QbeGen.CopyOp(qe, q)
+ 1950                                               END;
+ 1951                                               t := eT; sfx := TRUE
+ 1952                                             END; .) }
+ 1953          "]"
+ 1954        | "." GetIdent<fn>
+ 1955                                          (. IF k = SymTab.KindModule THEN
+ 1956                                               (* qualified L.x: materialize
+ 1957                                                  the export, then load it *)
+ 1958                                               IF NOT SymTab.MaterializeAlias(n,
+ 1959                                                    fn, mal) THEN
+ 1960                                                 SemError(201);
+ 1961                                                 t := SymTab.InvalidType;
+ 1962                                                 QbeGen.CopyOp("0", q)
+ 1963                                               ELSE
+ 1964                                                 QbeGen.CopyOp(mal, qn);
+ 1965                                                 t := SymTab.SymType(mal);
+ 1966                                                 k := SymTab.SymKind(mal);
+ 1967                                                 sfx := FALSE;
+ 1968                                                 IF k = SymTab.KindProc THEN
+ 1969                                                   (* call: ArgList supplies
+ 1970                                                      the value *)
+ 1971                                                   QbeGen.CopyOp("0", q)
+ 1972                                                 ELSIF NOT QbeGen.LoadDesignator(
+ 1973                                                      mal, t, k, q) THEN
+ 1974                                                   SemError(230);
+ 1975                                                   QbeGen.CopyOp("0", q)
+ 1976                                                 END
+ 1977                                               END
+ 1978                                             ELSIF t = SymTab.InvalidType THEN
+ 1979                                             ELSIF (SymTab.ClassOf(t) #
+ 1980                                                    SymTab.ClRecord)
+ 1981   AND (SymTab.ClassOf(t) #
+ 1982                                                   SymTab.ClClass) THEN
+ 1983                                               SemError(215);
+ 1984                                               t := SymTab.InvalidType
+ 1985                                             ELSIF (SymTab.ClassOf(t) =
+ 1986                                                    SymTab.ClClass)
+ 1987    AND SymTab.MethodExists(t, fn) THEN
+ 1988                                               (* obj.Method: bind the
+ 1989                                                  method and pass obj as
+ 1990                                                  the hidden receiver; q
+ 1991                                                  already holds the
+ 1992                                                  object's address *)
+ 1993                                               QbeGen.ArmRecv(q);
+ 1994                                               QbeGen.CopyOp(fn, n);
+ 1995                                               QbeGen.CopyOp(fn, qn);
+ 1996                                               methCls := t;
+ 1997                                               k := SymTab.KindProc;
+ 1998                                               t := SymTab.InvalidType
+ 1999                                             ELSIF NOT SymTab.FieldExists(t,
+ 2000                                                      fn) THEN
+ 2001                                               SemError(216);
+ 2002                                               t := SymTab.InvalidType
+ 2003                                             ELSE
+ 2004                                               fo := SymTab.FieldOffset(t,
+ 2005                                                 fn);
+ 2006                                               t := SymTab.FieldType(t, fn);
+ 2007                                               QbeGen.FieldAddr(q, fo, qe);
+ 2008                                               (* array fields are inline:
+ 2009                                                  the field address is the
+ 2010                                                  descriptor, like records *)
+ 2011                                               QbeGen.CopyOp(qe, q);
+ 2012                                               sfx := TRUE
+ 2013                                             END; .)
+ 2014        | "^"
+ 2015                                          (. IF t = SymTab.InvalidType THEN
+ 2016                                             ELSIF SymTab.ClassOf(t) #
+ 2017                                                   SymTab.ClPtr THEN
+ 2018                                               SemError(219);
+ 2019                                               t := SymTab.InvalidType
+ 2020                                             ELSE
+ 2021                                               bt := SymTab.PtrBase(t);
+ 2022                                               IF bt = SymTab.InvalidType THEN
+ 2023                                               ELSE
+ 2024                                                 IF sfx THEN
+ 2025                                                   QbeGen.ElemLoad(q, t,
+ 2026                                                     qb);
+ 2027                                                   QbeGen.CopyOp(qb, q)
+ 2028                                                 END;
+ 2029                                                 t := bt;
+ 2030                                                 (* q holds the pointee
+ 2031                                                    address: Fact loads
+ 2032                                                    scalars/pointers and uses
+ 2033                                                    the address for
+ 2034                                                    aggregates; the VAR-actual
+ 2035                                                    note is q itself. *)
+ 2036                                                 sfx := TRUE
+ 2037                                               END
+ 2038                                             END; .) } .
+ 2039    Expr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2040                                          (. VAR t2: SymTab.TypeIndex;
+ 2041                                               op: INTEGER;
+ 2042                                               q2, qt, wl: QbeGen.QVal;
+ 2043                                               isR: BOOLEAN; .)
+ 2044      = SimExpr<t, q>
+ 2045        [ Rel<op> SimExpr<t2, q2>
+ 2046          (. IF op = SymTab.OpIn THEN
+ 2047               IF SymTab.InCheck(t, t2) THEN
+ 2048                 IF (t = SymTab.InvalidType)
+ 2049                    OR (t2 = SymTab.InvalidType) THEN
+ 2050                   t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
+ 2051                 ELSE
+ 2052                   QbeGen.InSet(q, q2, SymTab.SetBaseLo(t2),
+ 2053                     SymTab.SetCount(t2), qt);
+ 2054                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2055                 END
+ 2056               ELSE SemError(222); t := SymTab.InvalidType;
+ 2057                 QbeGen.CopyOp("0", q)
+ 2058               END
+ 2059             ELSIF SymTab.RelCheck(t, t2, op) THEN
+ 2060               IF (t = SymTab.InvalidType)
+ 2061                  OR (t2 = SymTab.InvalidType) THEN
+ 2062                 t := SymTab.BoolType(); QbeGen.CopyOp("0", q)
+ 2063               ELSIF (SymTab.ClassOf(t) = SymTab.ClPtr)
+ 2064                  OR (SymTab.ClassOf(t2) = SymTab.ClPtr) THEN
+ 2065                 IF (op # SymTab.OpEq) AND (op # SymTab.OpNeq1)
+ 2066   AND (op # SymTab.OpNeq2) THEN
+ 2067                   SemError(213); t := SymTab.InvalidType;
+ 2068                   QbeGen.CopyOp("0", q)
+ 2069                 ELSE
+ 2070                   QbeGen.CmpL(op, q, q2, qt);
+ 2071                   t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2072                 END
+ 2073               ELSIF (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2074                  OR (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2075                 QbeGen.CmpSet(op, q, q2,
+ 2076                   SymTab.SetWords(t), SymTab.SetWords(t2), qt);
+ 2077                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2078               ELSIF SymTab.StrCompat(t, t2) THEN
+ 2079                 QbeGen.StrEq(op, q, q2, qt);
+ 2080                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2081               ELSIF SymTab.IsLongFamily(t)
+ 2082                  OR SymTab.IsLongFamily(t2) THEN
+ 2083                 IF SymTab.IsIntFamily(t) THEN
+ 2084                   QbeGen.WidenLong(q, wl); QbeGen.CopyOp(wl, q)
+ 2085                 END;
+ 2086                 IF SymTab.IsIntFamily(t2) THEN
+ 2087                   QbeGen.WidenLong(q2, wl); QbeGen.CopyOp(wl, q2)
+ 2088                 END;
+ 2089                 QbeGen.CmpLong(op, q, q2, qt);
+ 2090                 t := SymTab.BoolType(); QbeGen.CopyOp(qt, q)
+ 2091               ELSE
+ 2092                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2093                 t := SymTab.BoolType();
+ 2094                 QbeGen.Cmp(op, q, q2, qt, isR);
+ 2095                 QbeGen.CopyOp(qt, q)
+ 2096               END
+ 2097             ELSE SemError(213); t := SymTab.InvalidType;
+ 2098               QbeGen.CopyOp("0", q)
+ 2099             END; .) ] .
+ 2100    Rel<VAR op: INTEGER>
+ 2101      = "="                               (. op := SymTab.OpEq; .)
+ 2102      | "#"                               (. op := SymTab.OpNeq1; .)
+ 2103      | "<"                               (. op := SymTab.OpLt; .)
+ 2104      | "<="                              (. op := SymTab.OpLe; .)
+ 2105      | ">"                               (. op := SymTab.OpGt; .)
+ 2106      | ">="                              (. op := SymTab.OpGe; .)
+ 2107      | "IN"                              (. op := SymTab.OpIn; .) .
+ 2108    SimExpr<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2109                                          (. VAR t2, res2, lt, rt:
+ 2110                                                 SymTab.TypeIndex;
+ 2111                                               op: INTEGER;
+ 2112                                               q2, qt, wq, qf, q2a, q2b:
+ 2113                                                 QbeGen.QVal;
+ 2114                                               neg, isR, isL, folded:
+ 2115                                                 BOOLEAN;
+ 2116                                               fok: BOOLEAN;
+ 2117                                               lw, rw, mw: CARDINAL;
+ 2118                                               lTrue, lNext, lDone, qr, qs:
+ 2119                                                 QbeGen.QVal; .)
+ 2120      =                                   (. neg := FALSE; .)
+ 2121        [ "+" | "-"                       (. neg := TRUE; .) ]
+ 2122        Term<t, q>                        (. IF neg THEN
+ 2123                                             IF QbeGen.IsImm(q) THEN
+ 2124                                               QbeGen.NegFold(q, q)
+ 2125                                             ELSE QbeGen.NewTemp(qt);
+ 2126                                               QbeGen.NegQ(q, qt,
+ 2127                                                 SymTab.ClassOf(t)
+ 2128                                                 = SymTab.ClReal);
+ 2129                                               QbeGen.CopyOp(qt, q)
+ 2130                                             END
+ 2131                                           END; .)
+ 2132        { AddOp<op>                       (. IF op = SymTab.OpOr THEN
+ 2133                                               QbeGen.DelayBegin END; .)
+ 2134          Term<t2, q2>                     (. IF op = SymTab.OpOr THEN
+ 2135                                               QbeGen.DelayEnd END; .)
+ 2136          (. IF op = SymTab.OpOr THEN
+ 2137               (* short-circuit: if q is true the RHS is skipped *)
+ 2138               IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
+ 2139                 t := SymTab.BoolType()
+ 2140               ELSE SemError(212); t := SymTab.InvalidType END;
+ 2141               IF t # SymTab.InvalidType THEN
+ 2142                 QbeGen.Slot4(qs);
+ 2143                 QbeGen.NewLabel(lTrue);
+ 2144                 QbeGen.NewLabel(lNext);
+ 2145                 QbeGen.NewLabel(lDone);
+ 2146                 QbeGen.Jnz(q, lTrue, lNext);
+ 2147                 QbeGen.EmitLabel(lTrue);
+ 2148                 QbeGen.StoreW(qs, "1");
+ 2149                 QbeGen.Jmp(lDone);
+ 2150                 QbeGen.EmitLabel(lNext);
+ 2151                 QbeGen.DelayFlush;
+ 2152                 QbeGen.StoreW(qs, q2);
+ 2153                 QbeGen.Jmp(lDone);
+ 2154                 QbeGen.EmitLabel(lDone);
+ 2155                 QbeGen.LoadW(qs, qr);
+ 2156                 QbeGen.CopyOp(qr, q)
+ 2157               ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
+ 2158               END
+ 2159             ELSIF (op = SymTab.OpAdd)
+ 2160               AND (SymTab.UStrCompat(t, t2)
+ 2161                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
+ 2162                   AND (SymTab.ClassOf(t2) = SymTab.ClUStr))
+ 2163                 OR ((SymTab.ClassOf(t) = SymTab.ClUStr)
+ 2164                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))
+ 2165                 OR ((SymTab.ClassOf(t) = SymTab.ClUChar)
+ 2166                   AND (SymTab.ClassOf(t2) = SymTab.ClUChar))) THEN
+ 2167               (* UString concatenation: a UCHAR operand becomes a
+ 2168                  1-codepoint UString; the result is a descriptor in the
+ 2169                  shim's concat buffer.  Work on copies so neither
+ 2170                  operand is clobbered. *)
+ 2171               IF SymTab.ClassOf(t) = SymTab.ClUStr THEN
+ 2172                 QbeGen.CopyOp(q, q2a)
+ 2173               ELSE
+ 2174                 QbeGen.UStrFrom(q, q2a)
+ 2175               END;
+ 2176               IF SymTab.ClassOf(t2) = SymTab.ClUStr THEN
+ 2177                 QbeGen.UStrCat(q2a, q2, qt)
+ 2178               ELSE
+ 2179                 QbeGen.UStrFrom(q2, q2b);
+ 2180                 QbeGen.UStrCat(q2a, q2b, qt)
+ 2181               END;
+ 2182               t := SymTab.NewUStr();
+ 2183               QbeGen.CopyOp(qt, q)
+ 2184             ELSIF (op = SymTab.OpAdd)
+ 2185               AND (SymTab.StrCompat(t, t2)
+ 2186                 OR (SymTab.IsStrType(t)
+ 2187                   AND (SymTab.ClassOf(t2) = SymTab.ClChar))
+ 2188                 OR ((SymTab.ClassOf(t) = SymTab.ClChar)
+ 2189                   AND SymTab.IsStrType(t2))) THEN
+ 2190               (* string concatenation; a CHAR operand becomes a
+ 2191                  1-character string literal.  When both operands are
+ 2192                  constants, fold to a single string literal so a
+ 2193                  constructor element stays compile-time. *)
+ 2194               QbeGen.StrFold(q, q2, SymTab.ClassOf(t), SymTab.ClassOf(t2),
+ 2195                 qt, fok);
+ 2196               IF NOT fok THEN
+ 2197                 IF SymTab.StrCompat(t, t2) THEN
+ 2198                   QbeGen.StrCat(q, q2, qt)
+ 2199                 ELSIF SymTab.IsStrType(t) THEN
+ 2200                   QbeGen.DeclCharStr(q2, qs);
+ 2201                   QbeGen.StrCat(q, qs, qt)
+ 2202                 ELSE
+ 2203                   QbeGen.DeclCharStr(q, qs);
+ 2204                   QbeGen.StrCat(qs, q2, qt)
+ 2205                 END
+ 2206               END;
+ 2207               t := SymTab.NewStr();
+ 2208               QbeGen.CopyOp(qt, q)
+ 2209             ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
+ 2210   AND (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2211   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2212               lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
+ 2213               mw := lw;
+ 2214               IF rw > mw THEN mw := rw END;
+ 2215               IF op = SymTab.OpAdd THEN
+ 2216                 QbeGen.SetBinOp(0, q, q2, lw, rw, qt)
+ 2217               ELSE
+ 2218                 QbeGen.SetBinOp(2, q, q2, lw, rw, qt)
+ 2219               END;
+ 2220               t := SymTab.NewSet(
+ 2221                      SymTab.NewSubR(0,
+ 2222                        VAL(INTEGER, mw) * 32 - 1));
+ 2223               QbeGen.CopyOp(qt, q)
+ 2224             ELSE
+ 2225               IF SymTab.ArithCheck(t, t2, FALSE, res2) THEN
+ 2226                 lt := t; rt := t2; t := res2
+ 2227               ELSE SemError(211); t := SymTab.InvalidType END;
+ 2228               IF t # SymTab.InvalidType THEN
+ 2229                 isL := SymTab.IsLongFamily(t);
+ 2230                 isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2231                 folded := FALSE;
+ 2232                 IF (NOT isL) AND (NOT isR)
+ 2233    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
+ 2234                   IF op = SymTab.OpAdd THEN
+ 2235                     folded := QbeGen.Fold2(0, q, q2, qf)
+ 2236                   ELSE
+ 2237                     folded := QbeGen.Fold2(1, q, q2, qf)
+ 2238                   END
+ 2239                 END;
+ 2240                 IF folded THEN QbeGen.CopyOp(qf, q)
+ 2241                 ELSE
+ 2242                 IF isL THEN
+ 2243                   IF SymTab.IsIntFamily(lt) THEN
+ 2244                     QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
+ 2245                   END;
+ 2246                   IF SymTab.IsIntFamily(rt) THEN
+ 2247                     QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
+ 2248                   END;
+ 2249                   QbeGen.NewTemp(qt);
+ 2250                   IF op = SymTab.OpAdd THEN
+ 2251                     QbeGen.Op3L("add", qt, q, q2)
+ 2252                   ELSE
+ 2253                     QbeGen.Op3L("sub", qt, q, q2)
+ 2254                   END
+ 2255                 ELSE
+ 2256                   QbeGen.NewTemp(qt);
+ 2257                   IF op = SymTab.OpAdd THEN
+ 2258                     QbeGen.Op3("add", qt, q, q2, isR)
+ 2259                   ELSE
+ 2260                     QbeGen.Op3("sub", qt, q, q2, isR)
+ 2261                   END
+ 2262                 END;
+ 2263                 QbeGen.CopyOp(qt, q)
+ 2264                 END
+ 2265               ELSE QbeGen.CopyOp("0", q)
+ 2266               END
+ 2267             END; .) } .
+ 2268    AddOp<VAR op: INTEGER>
+ 2269      = "+"                               (. op := SymTab.OpAdd; .)
+ 2270      | "-"                               (. op := SymTab.OpSub; .)
+ 2271      | "OR"                              (. op := SymTab.OpOr; .) .
+ 2272    Term<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2273                                          (. VAR t2, res2, lt, rt:
+ 2274                                                 SymTab.TypeIndex;
+ 2275                                               op: INTEGER;
+ 2276                                               q2, qt, wq, qf:
+ 2277                                                 QbeGen.QVal;
+ 2278                                               isR, isL, folded: BOOLEAN;
+ 2279                                               lw, rw, mw: CARDINAL;
+ 2280                                               lNext, lFalse, lDone, qr, qs:
+ 2281                                                 QbeGen.QVal; .)
+ 2282      = Fact<t, q> { MulOp<op>            (. IF op = SymTab.OpAnd THEN
+ 2283                                               QbeGen.DelayBegin END; .)
+ 2284          Fact<t2, q2>                    (. IF op = SymTab.OpAnd THEN
+ 2285                                               QbeGen.DelayEnd END; .)
+ 2286        (. IF op = SymTab.OpAnd THEN
+ 2287             (* short-circuit: if q is false the RHS is skipped *)
+ 2288             IF SymTab.BoolCheck(t) AND SymTab.BoolCheck(t2) THEN
+ 2289               t := SymTab.BoolType()
+ 2290             ELSE SemError(212); t := SymTab.InvalidType END;
+ 2291             IF t # SymTab.InvalidType THEN
+ 2292               QbeGen.Slot4(qs);
+ 2293               QbeGen.NewLabel(lNext);
+ 2294               QbeGen.NewLabel(lFalse);
+ 2295               QbeGen.NewLabel(lDone);
+ 2296               QbeGen.Jnz(q, lNext, lFalse);
+ 2297               QbeGen.EmitLabel(lNext);
+ 2298               QbeGen.DelayFlush;
+ 2299               QbeGen.StoreW(qs, q2);
+ 2300               QbeGen.Jmp(lDone);
+ 2301               QbeGen.EmitLabel(lFalse);
+ 2302               QbeGen.StoreW(qs, "0");
+ 2303               QbeGen.Jmp(lDone);
+ 2304               QbeGen.EmitLabel(lDone);
+ 2305               QbeGen.LoadW(qs, qr);
+ 2306               QbeGen.CopyOp(qr, q)
+ 2307             ELSE QbeGen.DelayFlush; QbeGen.CopyOp("0", q)
+ 2308             END
+ 2309           ELSIF (t # SymTab.InvalidType) AND (t2 # SymTab.InvalidType)
+ 2310   AND (SymTab.ClassOf(t) = SymTab.ClSet)
+ 2311   AND (SymTab.ClassOf(t2) = SymTab.ClSet) THEN
+ 2312             lw := SymTab.SetWords(t); rw := SymTab.SetWords(t2);
+ 2313             mw := lw;
+ 2314             IF rw > mw THEN mw := rw END;
+ 2315             IF op = SymTab.OpTimes THEN
+ 2316               QbeGen.SetBinOp(1, q, q2, lw, rw, qt)
+ 2317             ELSE
+ 2318               QbeGen.SetBinOp(3, q, q2, lw, rw, qt)
+ 2319             END;
+ 2320             t := SymTab.NewSet(
+ 2321                    SymTab.NewSubR(0,
+ 2322                      VAL(INTEGER, mw) * 32 - 1));
+ 2323             QbeGen.CopyOp(qt, q)
+ 2324           ELSE
+ 2325             IF SymTab.ArithCheck(t, t2,
+ 2326                  (op = SymTab.OpDiv) OR (op = SymTab.OpMod),
+ 2327                  res2) THEN
+ 2328               lt := t; rt := t2; t := res2
+ 2329             ELSE SemError(211); t := SymTab.InvalidType END;
+ 2330             IF t # SymTab.InvalidType THEN
+ 2331               isL := SymTab.IsLongFamily(t);
+ 2332               isR := SymTab.ClassOf(t) = SymTab.ClReal;
+ 2333               folded := FALSE;
+ 2334               IF (NOT isL) AND (NOT isR)
+ 2335    AND QbeGen.IsImm(q) AND QbeGen.IsImm(q2) THEN
+ 2336                 IF op = SymTab.OpTimes THEN
+ 2337                   folded := QbeGen.Fold2(2, q, q2, qf)
+ 2338                 ELSIF op = SymTab.OpDiv THEN
+ 2339                   folded := QbeGen.Fold2(3, q, q2, qf)
+ 2340                 ELSIF op = SymTab.OpMod THEN
+ 2341                   folded := QbeGen.Fold2(4, q, q2, qf)
+ 2342                 END
+ 2343               END;
+ 2344               IF folded THEN QbeGen.CopyOp(qf, q)
+ 2345               ELSE
+ 2346               IF isL THEN
+ 2347                 IF SymTab.IsIntFamily(lt) THEN
+ 2348                   QbeGen.WidenLong(q, wq); QbeGen.CopyOp(wq, q)
+ 2349                 END;
+ 2350                 IF SymTab.IsIntFamily(rt) THEN
+ 2351                   QbeGen.WidenLong(q2, wq); QbeGen.CopyOp(wq, q2)
+ 2352                 END;
+ 2353                 QbeGen.NewTemp(qt);
+ 2354                 IF op = SymTab.OpTimes THEN
+ 2355                   QbeGen.Op3L("mul", qt, q, q2)
+ 2356                 ELSIF (op = SymTab.OpDiv)
+ 2357                    OR (op = SymTab.OpSlash) THEN
+ 2358                   QbeGen.Op3L("div", qt, q, q2)
+ 2359                 ELSE
+ 2360                   QbeGen.Op3L("rem", qt, q, q2)
+ 2361                 END
+ 2362               ELSE
+ 2363                 QbeGen.NewTemp(qt);
+ 2364                 IF op = SymTab.OpTimes THEN
+ 2365                   QbeGen.Op3("mul", qt, q, q2, isR)
+ 2366                 ELSIF (op = SymTab.OpDiv)
+ 2367                    OR (op = SymTab.OpSlash) THEN
+ 2368                   QbeGen.Op3("div", qt, q, q2, isR)
+ 2369                 ELSE
+ 2370                   QbeGen.Op3("rem", qt, q, q2, isR)
+ 2371                 END
+ 2372               END;
+ 2373               QbeGen.CopyOp(qt, q)
+ 2374               END
+ 2375             ELSE QbeGen.CopyOp("0", q)
+ 2376             END
+ 2377           END; .) } .
+ 2378    MulOp<VAR op: INTEGER>
+ 2379      = "*"                               (. op := SymTab.OpTimes; .)
+ 2380      | "/"                               (. op := SymTab.OpSlash; .)
+ 2381      | "DIV"                             (. op := SymTab.OpDiv; .)
+ 2382      | "MOD"                             (. op := SymTab.OpMod; .)
+ 2383      | ( "AND" | "&" )                   (. op := SymTab.OpAnd; .) .
+ 2384    Fact<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2385                                          (. VAR s: ARRAY [0 .. 255] OF CHAR;
+ 2386                                               et, dt, t2, st, ct2, et2:
+ 2387                                                 SymTab.TypeIndex;
+ 2388                                               dk: INTEGER;
+ 2389                                               qd, q2, sq, qa, qm0, qr, qt:
+ 2390                                                 QbeGen.QVal;
+ 2391                                               qn, vn: SymTab.Name;
+ 2392                                               vt: SymTab.TypeIndex;
+ 2393                                               c1, c2: INTEGER;
+ 2394                                               lo, hi: INTEGER;
+ 2395                                               isMax: BOOLEAN;
+ 2396                                               called, isHigh, sfx, isCh,
+ 2397                                               isU, uok, isStr: BOOLEAN;
+ 2398                                               ucp: INTEGER; .)
+ 2399      = integer                           (. LexString(s);
+ 2400                                             QbeGen.NormInt(s, q);
+ 2401                                             t := SymTab.IntType(); .)
+ 2402      | charConst                         (. LexString(s);
+ 2403                                             QbeGen.NormLit(s, q, isCh);
+ 2404                                             t := SymTab.CharType(); .)
+ 2405      | real                              (. LexString(s);
+ 2406                                             QbeGen.NormReal(s, q);
+ 2407                                             t := SymTab.RealType(); .)
+ 2408      | string                            (. LexString(s);
+ 2409                                             IF SymTab.StrLen(s) = 3 THEN
+ 2410                                               t := SymTab.CharType();
+ 2411                                               QbeGen.IntStr(
+ 2412                                                 QbeGen.CharVal(s), q)
+ 2413                                             ELSE t := SymTab.NewStr();
+ 2414                                               QbeGen.DeclStr(s, q);
+ 2415                                               (* a literal's value IS its
+ 2416                                                  static descriptor address *)
+ 2417                                               QbeGen.NoteAddr(q, q)
+ 2418                                             END; .)
+ 2419      | ustring                           (. LexString(s);
+ 2420                                             QbeGen.DeclUStr(s, q, isU, ucp,
+ 2421                                               uok);
+ 2422                                             IF NOT uok THEN
+ 2423                                               SemError(234);
+ 2424                                               t := SymTab.InvalidType
+ 2425                                             ELSIF isU THEN
+ 2426                                               t := SymTab.UCharType();
+ 2427                                               QbeGen.IntStr(ucp, q)
+ 2428                                             ELSE
+ 2429                                               t := SymTab.NewUStr();
+ 2430                                               QbeGen.NoteAddr(q, q)
+ 2431                                             END; .)
+ 2432      | Design<dt, dk, qd, qn, sfx>       (. called := FALSE;
+ 2433                                             t := dt;
+ 2434                                             IF sfx THEN
+ 2435                                               IF dt =
+ 2436                                                  SymTab.InvalidType THEN
+ 2437                                                 QbeGen.CopyOp("0", q)
+ 2438                                               ELSIF (SymTab.ClassOf(dt) =
+ 2439                                                      SymTab.ClRecord)
+ 2440                                                  OR (SymTab.ClassOf(dt) =
+ 2441                                                      SymTab.ClSet)
+ 2442                                                  OR (SymTab.ClassOf(dt) =
+ 2443                                                      SymTab.ClArray)
+ 2444                                                  OR (SymTab.ClassOf(dt) =
+ 2445                                                      SymTab.ClClass) THEN
+ 2446                                                 QbeGen.CopyOp(qd, q)
+ 2447                                               ELSE QbeGen.ElemLoad(qd, dt,
+ 2448                                                 q)
+ 2449                                               END
+ 2450                                             ELSE QbeGen.CopyOp(qd, q)
+ 2451                                             END;
+ 2452                                             IF (dk = SymTab.KindVar)
+ 2453                                                OR (dk = SymTab.KindParam)
+ 2454                                                OR (dk =
+ 2455                                                   SymTab.KindField) THEN
+ 2456                                               IF sfx THEN
+ 2457                                                 QbeGen.NoteAddr(q, qd)
+ 2458                                               ELSE
+ 2459                                                 QbeGen.AddrOf(qn, qa);
+ 2460                                                 QbeGen.NoteAddr(q, qa)
+ 2461                                               END
+ 2462                                             ELSIF sfx
+ 2463   AND (dt #
+ 2464                                                   SymTab.InvalidType)
+ 2465   AND ((SymTab.ClassOf(dt) =
+ 2466                                                    SymTab.ClArray)
+ 2467                                                   OR (SymTab.ClassOf(dt) =
+ 2468                                                       SymTab.ClSet)
+ 2469                                                   OR (SymTab.ClassOf(dt) =
+ 2470                                                       SymTab.ClRecord)) THEN
+ 2471                                               QbeGen.NoteAddr(qd, qd)
+ 2472                                             END; .)
+ 2473        [ TypedBraceLit<dt, q>            (. t := dt; .) ]
+ 2474        [ ArgList<qn, dt, qd, TRUE, methCls, ct2, q2, called>
+ 2475                                          (. t := ct2;
+ 2476                                             QbeGen.CopyOp(q2, q); .) ]
+ 2477                                          (. IF NOT called
+ 2478   AND (dk = SymTab.KindProc) THEN
+ 2479                                               (* bare zero-arg function
+ 2480                                                  call (parentheses may be
+ 2481                                                  omitted); a proper or
+ 2482                                                  parameterised proc here
+ 2483                                                  is 230 *)
+ 2484                                               IF (SymTab.ProcNPar(qn) = 0)
+ 2485   AND (SymTab.ProcRes(qn) #
+ 2486                                                     SymTab.InvalidType) THEN
+ 2487                                                 QbeGen.Mangled(qn,
+ 2488                                                   SymTab.ProcUid(qn), qm0);
+ 2489                                                 QbeGen.CallBegin(qm0,
+ 2490                                                   SymTab.ProcRes(qn),
+ 2491                                                   SymTab.ProcDepthOf(qn),
+ 2492                                                   SymTab.IsExternal(qn));
+ 2493                                                 QbeGen.CallEnd(TRUE, q);
+ 2494                                                 t := SymTab.ProcRes(qn)
+ 2495                                               ELSE
+ 2496                                                 (* procedure used as a
+ 2497                                                    value (assign to a
+ 2498                                                    procedure variable):
+ 2499                                                    its code address *)
+ 2500                                                 t := SymTab.ProcTypeOf(qn);
+ 2501                                                 QbeGen.Mangled(qn,
+ 2502                                                   SymTab.ProcUid(qn), qm0);
+ 2503                                                 QbeGen.ProcAddr(qm0, q)
+ 2504                                               END
+ 2505                                             END; .)
+ 2506      | ( "HIGH"                          (. isHigh := TRUE; .)
+ 2507        | ( "LEN" | "LENGTH" )            (. isHigh := FALSE; .) )
+ 2508        "(" ( Design<dt, dk, qd, qn, sfx> (. isStr := FALSE;
+ 2509                                              isU := FALSE; .)
+ 2510            | string                       (. LexString(s);
+ 2511                                              isStr := TRUE;
+ 2512                                              isU := FALSE;
+ 2513                                              IF SymTab.StrLen(s) = 3 THEN
+ 2514                                                dt := SymTab.CharType();
+ 2515                                                QbeGen.IntStr(QbeGen.CharVal(s),
+ 2516                                                  qd)
+ 2517                                              ELSE
+ 2518                                                dt := SymTab.NewStr();
+ 2519                                                QbeGen.DeclStr(s, qd);
+ 2520                                                QbeGen.NoteAddr(qd, qd)
+ 2521                                              END;
+ 2522                                              dk := -1;
+ 2523                                              qn[0] := CHR(0); .)
+ 2524            | ustring                      (. LexString(s);
+ 2525                                              QbeGen.DeclUStr(s, qd, isU, ucp,
+ 2526                                                uok);
+ 2527                                              isStr := FALSE;
+ 2528                                              IF NOT uok THEN
+ 2529                                                SemError(234);
+ 2530                                                dt := SymTab.InvalidType
+ 2531                                              ELSIF isU THEN
+ 2532                                                (* one codepoint: a UCHAR;
+ 2533                                                   LEN is 1, HIGH is 0 *)
+ 2534                                                dt := SymTab.UCharType();
+ 2535                                                QbeGen.IntStr(ucp, qd)
+ 2536                                              ELSE
+ 2537                                                dt := SymTab.NewUStr();
+ 2538                                                QbeGen.NoteAddr(qd, qd)
+ 2539                                              END;
+ 2540                                              dk := -1;
+ 2541                                              qn[0] := CHR(0); .) )
+ 2542        ")"
+ 2543                                          (. IF (dt # SymTab.InvalidType)
+ 2544    AND (SymTab.ClassOf(dt) = SymTab.ClUStr) THEN
+ 2545                                               (* UString: the count is
+ 2546                                                  the descriptor header *)
+ 2547                                               IF isHigh THEN
+ 2548                                                 QbeGen.UStrLen(qd, qr);
+ 2549                                                 QbeGen.DecQ(qr)
+ 2550                                               ELSE
+ 2551                                                 QbeGen.UStrLen(qd, qr)
+ 2552                                               END;
+ 2553                                               t := SymTab.IntType();
+ 2554                                               QbeGen.CopyOp(qr, q)
+ 2555                                             ELSIF (dt # SymTab.InvalidType)
+ 2556    AND (SymTab.ClassOf(dt) = SymTab.ClUChar) THEN
+ 2557                                               (* single UCHAR codepoint *)
+ 2558                                               IF isHigh THEN
+ 2559                                                 QbeGen.CopyOp("0", qr)
+ 2560                                               ELSE
+ 2561                                                 QbeGen.CopyOp("1", qr)
+ 2562                                               END;
+ 2563                                               t := SymTab.IntType();
+ 2564                                               QbeGen.CopyOp(qr, q)
+ 2565                                             ELSIF isStr THEN
+ 2566                                               (* fold: content length at
+ 2567                                                  compile time *)
+ 2568                                               IF SymTab.StrLen(s) = 3 THEN
+ 2569                                                 c1 := 1
+ 2570                                               ELSE
+ 2571                                                 c1 :=
+ 2572                                                   SymTab.StrLen(s) - 2
  2573                                               END;
- 2574                                                t := SymTab.IntType();
- 2575                                                QbeGen.CopyOp(qr, q)
- 2576                                              END; .)
- 2577      | ( "SIZE" | "TSIZE" ) "(" Design<dt, dk, qd, qn, sfx> ")"
- 2578                                          (. IF dt = SymTab.InvalidType THEN
- 2579                                               t := SymTab.InvalidType;
- 2580                                               QbeGen.CopyOp("0", q)
- 2581                                             ELSE
- 2582                                               QbeGen.IntStr(VAL(INTEGER,
- 2583                                                 SymTab.ObjectSize(dt)), q);
- 2584                                               t := SymTab.IntType()
- 2585                                             END; .)
- 2586      | ( "SHIFT"                         (. isMax := FALSE; .)
- 2587        | "ROTATE"                        (. isMax := TRUE; .) )
- 2588        "(" Expr<et, q> "," Expr<et2, q2> ")"
- 2589                                          (. (* set shift/rotate: isMax
- 2590                                                doubles as "rotate" *)
- 2591                                             IF (et # SymTab.InvalidType)
- 2592                                                AND (SymTab.ClassOf(et) =
- 2593                                                   SymTab.ClSet) THEN
- 2594                                               QbeGen.SetShift(q, q2,
- 2595                                                 SymTab.SetWords(et),
- 2596                                                 SymTab.SetCount(et), isMax,
- 2597                                                 qt);
- 2598                                               t := et;
- 2599                                               QbeGen.CopyOp(qt, q)
- 2600                                             ELSE SemError(230);
- 2601                                               t := SymTab.InvalidType;
- 2602                                               QbeGen.CopyOp("0", q)
- 2603                                             END; .)
- 2604      | ( "MIN"                           (. isMax := FALSE; .)
- 2605        | "MAX"                           (. isMax := TRUE; .) )
- 2606        "(" Design<dt, dk, qd, qn, sfx> ")"
- 2607                                          (. IF (dt # SymTab.InvalidType)
- 2608   AND (SymTab.ClassOf(dt) = SymTab.ClReal) THEN
- 2609                                               (* REAL/LONGREAL: the
- 2610                                                  implementation bounds *)
- 2611                                               IF isMax THEN
- 2612                                                 QbeGen.NormReal(
- 2613                                                   "3.402823e38", q)
- 2614                                               ELSE QbeGen.NormReal(
- 2615                                                   "-3.402823e38", q)
- 2616                                               END;
- 2617                                               t := SymTab.RealType()
- 2618                                             ELSIF (dt #
- 2619                                                SymTab.InvalidType)
- 2620   AND (SymTab.ClassOf(dt) =
- 2621                                                   SymTab.ClLong) THEN
- 2622                                               IF isMax THEN
- 2623                                                 QbeGen.CopyOp(
- 2624                                                   "9223372036854775807", q)
- 2625                                               ELSE QbeGen.CopyOp(
- 2626                                                   "-9223372036854775808", q)
- 2627                                               END;
- 2628                                               t := SymTab.LongType()
- 2629                                             ELSIF SymTab.TypeBounds(dt, lo,
- 2630                                                      hi) THEN
- 2631                                               IF isMax THEN
- 2632                                                 QbeGen.IntStr(hi, q)
- 2633                                               ELSE QbeGen.IntStr(lo, q)
- 2634                                               END;
- 2635                                               t := SymTab.IntType()
- 2636                                             ELSE SemError(230);
- 2637                                               t := SymTab.InvalidType;
- 2638                                               QbeGen.CopyOp("0", q)
- 2639                                             END; .)
- 2640      | "ADR" "(" Design<dt, dk, qd, qn, sfx> ")"
- 2641                                          (. IF dt = SymTab.InvalidType THEN
- 2642                                               t := SymTab.InvalidType;
- 2643                                               QbeGen.CopyOp("0", q)
- 2644                                             ELSE
- 2645                                               IF sfx THEN
- 2646                                                 QbeGen.CopyOp(qd, q)
- 2647                                               ELSIF (dk = SymTab.KindVar)
- 2648                                                  OR (dk = SymTab.KindParam) THEN
- 2649                                                 QbeGen.AddrOf(qn, q)
- 2650                                               ELSE SemError(230);
- 2651                                                 QbeGen.CopyOp("0", q)
- 2652                                               END;
- 2653                                               t := SymTab.AddrType()
- 2654                                             END; .)
- 2655      | "CHR" "(" Expr<et, q> ")"
- 2656                                          (. IF (et # SymTab.InvalidType)
- 2657   AND NOT SymTab.IsIntFamily(et) THEN
- 2658                                               SemError(211) END;
- 2659                                             t := SymTab.CharType(); .)
- 2660      | ( "ORD" | "ORDL" ) "(" Expr<et, q> ")"
- 2661                                          (. IF et # SymTab.InvalidType THEN
- 2662                                               IF (SymTab.ClassOf(et) #
- 2663                                                   SymTab.ClChar)
- 2664   AND (SymTab.ClassOf(et) #
- 2665                                                     SymTab.ClBool)
- 2666   AND (SymTab.ClassOf(et) #
- 2667                                                     SymTab.ClEnum)
- 2668   AND NOT SymTab.IsIntFamily(et) THEN
- 2669                                                 SemError(211) END
- 2670                                             END;
- 2671                                             t := SymTab.IntType(); .)
- 2672      | "CAP" "(" Expr<et, q> ")"
- 2673                                          (. QbeGen.CapQ(q, qa);
- 2674                                             QbeGen.CopyOp(qa, q);
- 2675                                             t := SymTab.CharType(); .)
- 2676      | "UCHR" "(" Expr<et, q> ")"
- 2677                                          (. (* UCHR: the UCHAR constructor.
- 2678                                                CHAR -> UCHAR (identity);
- 2679                                                INTEGER familly -> UCHAR
- 2680                                                (codepoint value). *)
- 2681                                             IF (et # SymTab.InvalidType)
- 2682    AND (SymTab.ClassOf(et) # SymTab.ClChar)
- 2683    AND NOT SymTab.IsIntFamily(et) THEN
- 2684                                               SemError(211) END;
- 2685                                             t := SymTab.UCharType(); .)
- 2686      | "CHR8" "(" Expr<et, q> ")"
- 2687                                          (. IF (et # SymTab.InvalidType)
- 2688    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
- 2689                                               SemError(211) END;
- 2690                                             QbeGen.WidenLong(q, qa);
- 2691                                             QbeGen.CheckRange(qa, "0", "255");
- 2692                                             t := SymTab.CharType(); .)
- 2693      | "UORD" "(" Expr<et, q> ")"
- 2694                                          (. (* UORD(u): the codepoint as a
- 2695                                                32-bit ordinal (INTEGER),
- 2696                                                cf. ORD for CHAR. *)
- 2697                                             IF (et # SymTab.InvalidType)
- 2698    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
- 2699                                               SemError(211) END;
- 2700                                             t := SymTab.IntType(); .)
- 2701      | "ABS" "(" Expr<et, q> ")"
- 2702                                          (. IF (et # SymTab.InvalidType)
- 2703   AND NOT SymTab.IsIntFamily(et)
- 2704   AND (SymTab.ClassOf(et) #
- 2705                                                  SymTab.ClReal) THEN
- 2706                                               SemError(211)
- 2707                                             ELSE QbeGen.AbsQ(q, qa,
- 2708                                                    SymTab.ClassOf(et) =
- 2709                                                      SymTab.ClReal);
- 2710                                               QbeGen.CopyOp(qa, q)
- 2711                                             END;
- 2712                                             t := et; .)
- 2713      | "VAL" "(" GetIdent<vn> "," Expr<et, q> ")"
- 2714                                          (. IF NOT SymTab.Lookup(vn) THEN
- 2715                                               SemError(201);
- 2716                                               t := SymTab.InvalidType
- 2717                                             ELSE vt := SymTab.SymType(vn);
- 2718                                               IF vt = SymTab.InvalidType THEN
- 2719                                                 t := SymTab.InvalidType
- 2720                                               ELSIF et =
- 2721                                                  SymTab.InvalidType THEN
- 2722                                                 t := vt
- 2723                                               ELSE
- 2724                                                 c1 := SymTab.ClassOf(et);
- 2725                                                 c2 := SymTab.ClassOf(vt);
- 2726                                                 IF (c1 = SymTab.ClInt)
- 2727    AND (c2 = SymTab.ClLong) THEN
- 2728                                                   QbeGen.WidenLong(q, qa);
- 2729                                                   QbeGen.CopyOp(qa, q);
- 2730                                                   t := vt
- 2731                                                 ELSIF (c1 = SymTab.ClLong)
- 2732    AND (c2 = SymTab.ClInt) THEN
- 2733                                                   QbeGen.NarrowLong(q, qa);
- 2734                                                   QbeGen.CopyOp(qa, q);
- 2735                                                   t := vt
- 2736                                                 ELSIF (c1 = SymTab.ClInt)
- 2737    AND (c2 = SymTab.ClReal) THEN
- 2738                                                   QbeGen.ConvIR(q, qa);
- 2739                                                   QbeGen.CopyOp(qa, q);
- 2740                                                   t := vt
- 2741                                                 ELSIF (c1 = SymTab.ClLong)
- 2742    AND (c2 = SymTab.ClReal) THEN
- 2743                                                   QbeGen.ConvLR(q, qa);
- 2744                                                   QbeGen.CopyOp(qa, q);
- 2745                                                   t := vt
- 2746                                                 ELSIF (c1 = SymTab.ClReal)
- 2747    AND (c2 = SymTab.ClInt) THEN
- 2748                                                   QbeGen.ConvRI(q, qa);
- 2749                                                   QbeGen.CopyOp(qa, q);
- 2750                                                   t := vt
- 2751                                                 ELSIF (c1 = SymTab.ClReal)
- 2752    AND (c2 = SymTab.ClLong) THEN
- 2753                                                   QbeGen.ConvRL(q, qa);
- 2754                                                   QbeGen.CopyOp(qa, q);
- 2755                                                   t := vt
- 2756                                                 ELSIF ((c1 = SymTab.ClInt)
- 2757                                                     OR (c1 =
- 2758                                                        SymTab.ClChar)
- 2759                                                     OR (c1 =
- 2760                                                        SymTab.ClBool)
- 2761                                                     OR (c1 =
- 2762                                                        SymTab.ClEnum))
- 2763   AND ((c2 = SymTab.ClInt)
- 2764                                                     OR (c2 =
- 2765                                                        SymTab.ClChar)
- 2766                                                     OR (c2 =
- 2767                                                        SymTab.ClBool)
- 2768                                                     OR (c2 =
- 2769                                                        SymTab.ClEnum)) THEN
- 2770                                                   t := vt
- 2771                                                 ELSIF (c1 = SymTab.ClPtr)
- 2772   AND (c2 = SymTab.ClPtr) THEN
- 2773                                                   t := vt
- 2774                                                 ELSIF (c1 = SymTab.ClReal)
- 2775   AND (c2 = SymTab.ClReal) THEN
- 2776                                                   t := vt
- 2777                                                 ELSE SemError(230);
- 2778                                                   t := SymTab.InvalidType
- 2779                                                 END
- 2780                                               END
- 2781                                             END; .)
- 2782      | "(" Expr<et, q> ")"               (. t := et; .)
- 2783      | SetLit<st, sq>                    (. t := st;
- 2784                                             QbeGen.CopyOp(sq, q); .)
- 2785      | ( "NOT" | "~" ) Fact<t2, q2>      (. IF SymTab.BoolCheck(t2) THEN
- 2786                                               t := SymTab.BoolType()
- 2787                                             ELSE SemError(212);
- 2788                                               t := SymTab.InvalidType END;
- 2789                                             IF t # SymTab.InvalidType THEN
- 2790                                               QbeGen.NotQ(q2, q)
- 2791                                             ELSE QbeGen.CopyOp("0", q)
- 2792                                             END; .) .
- 2793    (* Set literals are SET OF [0..255] (8 words); elements validated
- 2794       0..255 statically when foldable (222 otherwise), runtime trap
- 2795       for computed elements. Ranges always lower via SetRange. *)
- 2796    SetLit<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2797      = "{"                               (. t := SymTab.NewSet(
- 2798                                               SymTab.NewSubR(0, 255));
- 2799                                             QbeGen.NewSetTemp(8, q);
- 2800                                             QbeGen.SetZero(q, 8); .)
- 2801        [ SetElem<t, q> { "," SetElem<t, q> } ]
- 2802        "}" .
- 2803    (* Typed brace constructor: TypeName{ elems } — BITSET{0} (a set)
- 2804       or ArrayName{...} (an array constructor, GNU Modula-2).  The
- 2805       declared type sets the width (set) or element type (array). *)
- 2806    TypedBraceLit<vt: SymTab.TypeIndex; VAR q: QbeGen.QVal>
- 2807                                          (. VAR nw: CARDINAL;
- 2808                                               savedCls: INTEGER; .)
- 2809      = "{"                               (. savedCls := braceCls;
- 2810                                             IF vt = SymTab.InvalidType THEN
- 2811                                               braceCls := -1
- 2812                                             ELSE braceCls :=
- 2813                                                    SymTab.ClassOf(vt)
- 2814                                             END;
- 2815                                             IF braceCls = SymTab.ClSet THEN
- 2816                                               IF vt = SymTab.InvalidType THEN
- 2817                                                 nw := 8
- 2818                                               ELSE nw := SymTab.SetWords(vt);
- 2819                                                 IF nw = 0 THEN nw := 8 END
- 2820                                               END;
- 2821                                               QbeGen.NewSetTemp(nw, q);
- 2822                                               QbeGen.SetZero(q, nw)
- 2823                                             ELSIF (braceCls =
- 2824                                                    SymTab.ClArray)
- 2825                                                OR (braceCls =
- 2826                                                    SymTab.ClRecord)
- 2827                                                OR (braceCls =
- 2828                                                    SymTab.ClClass) THEN
- 2829                                               QbeGen.CtorBegin(vt)
- 2830                                             ELSE
- 2831                                               IF vt # SymTab.InvalidType THEN
- 2832                                                 SemError(230) END;
- 2833                                               braceCls := -1
- 2834                                             END; .)
- 2835        [ BraceElem<vt, q> { "," BraceElem<vt, q> } ]
- 2836        "}"                               (. IF (braceCls = SymTab.ClArray)
- 2837                                                OR (braceCls =
- 2838                                                   SymTab.ClRecord)
- 2839                                                OR (braceCls =
- 2840                                                   SymTab.ClClass) THEN
- 2841                                               QbeGen.CtorEnd(q)
- 2842                                             ELSIF braceCls # SymTab.ClSet THEN
- 2843                                               QbeGen.CopyOp("0", q)
- 2844                                             END;
- 2845                                             braceCls := savedCls; .) .
- 2846    BraceElem<vt: SymTab.TypeIndex; VAR sq: QbeGen.QVal>
- 2847                                          (. VAR et, et2: SymTab.TypeIndex;
- 2848                                               qe, q2: QbeGen.QVal;
- 2849                                               v, v2, reps, k: INTEGER;
- 2850                                               elem: SymTab.TypeIndex;
- 2851                                               lo: INTEGER;
- 2852                                               span: CARDINAL;
- 2853                                               cl, cl2: INTEGER;
- 2854                                               hasR, hasB: BOOLEAN; .)
- 2855      =                                   (. hasR := FALSE; hasB := FALSE; .)
- 2856        Expr<et, qe>
- 2857        [ ".." Expr<et2, q2>              (. hasR := TRUE; .) ]
- 2858        [ "BY" Expr<et2, q2>              (. hasB := TRUE; .) ]
- 2859                                          (. IF braceCls = SymTab.ClSet THEN
- 2860                                               IF hasB THEN SemError(230) END;
- 2861                                               lo := SymTab.SetBaseLo(vt);
- 2862                                               span := SymTab.SetCount(vt);
- 2863                                               IF (et = SymTab.InvalidType)
- 2864                                                  OR (hasR AND (et2 =
- 2865                                                     SymTab.InvalidType)) THEN
- 2866                                               ELSE cl :=
- 2867                                                      SymTab.ClassOf(et);
- 2868                                                 IF hasR THEN
- 2869                                                   cl2 :=
- 2870                                                     SymTab.ClassOf(et2)
- 2871                                                 ELSE cl2 := SymTab.ClInt
- 2872                                                 END;
- 2873                                                 IF NOT SymTab.SetElemClassOk(cl)
- 2874                                                    OR (hasR AND NOT
- 2875                                                       SymTab.SetElemClassOk(cl2))
- 2876                                                 THEN
- 2877                                                   SemError(222)
- 2878                                                 ELSIF hasR
- 2879   AND SymTab.ConstInt(qe, v)
- 2880   AND SymTab.ConstInt(q2,
- 2881                                                       v2)
- 2882   AND ((v < lo)
- 2883                                                       OR (v2 < lo)
- 2884                                                       OR (v >= lo +
- 2885                                                          VAL(INTEGER, span))
- 2886                                                       OR (v2 >= lo +
- 2887                                                          VAL(INTEGER, span))
- 2888                                                       OR (v > v2)) THEN
- 2889                                                   SemError(222)
- 2890                                                  ELSIF hasR THEN
- 2891                                                    QbeGen.SetRange(sq, qe, q2,
- 2892                                                      lo, span)
- 2893                                                  ELSIF SymTab.ConstInt(qe,
- 2894                                                          v)
- 2895   AND ((v < lo)
- 2896                                                        OR (v >= lo +
- 2897                                                           VAL(INTEGER,
- 2898                                                             span))) THEN
- 2899                                                    SemError(222)
- 2900                                                  ELSE QbeGen.SetBit(sq, qe,
- 2901                                                    lo, span)
- 2902                                                 END
- 2903                                               END
- 2904                                             ELSIF (braceCls = SymTab.ClArray)
- 2905                                                OR (braceCls =
- 2906                                                   SymTab.ClRecord)
- 2907                                                OR (braceCls =
- 2908                                                   SymTab.ClClass) THEN
- 2909                                               IF hasR THEN SemError(230) END;
- 2910                                               reps := 1;
- 2911                                               IF hasB THEN
- 2912                                                 IF SymTab.ConstInt(q2, v2)
- 2913   AND (v2 >= 1) THEN
- 2914                                                   reps := v2
- 2915                                                 ELSE SemError(230)
- 2916                                                 END
- 2917                                               END;
- 2918                                               k := 0;
- 2919                                               WHILE k < reps DO
- 2920                                                 QbeGen.CtorElem(qe);
- 2921                                                 INC(k)
- 2922                                               END
- 2923                                             END; .) .
- 2924    SetElem<st: SymTab.TypeIndex; sq: QbeGen.QVal>         (. VAR et, et2: SymTab.TypeIndex;
- 2925                                               qe, q2: QbeGen.QVal;
- 2926                                               v, v2: INTEGER;
- 2927                                               lo: INTEGER;
- 2928                                               span: CARDINAL;
- 2929                                               cl, cl2: INTEGER;
- 2930                                               hasR: BOOLEAN; .)
- 2931      =                                   (. hasR := FALSE; .)
- 2932        Expr<et, qe>
- 2933        [ ".." Expr<et2, q2>              (. hasR := TRUE; .) ]
- 2934                                          (. lo := SymTab.SetBaseLo(st);
- 2935                                             span := SymTab.SetCount(st);
- 2936                                             IF (et = SymTab.InvalidType)
- 2937                                                OR (hasR AND (et2 =
- 2938                                                   SymTab.InvalidType)) THEN
- 2939                                             ELSE cl :=
- 2940                                                    SymTab.ClassOf(et);
- 2941                                               IF hasR THEN
- 2942                                                 cl2 :=
- 2943                                                   SymTab.ClassOf(et2)
- 2944                                               ELSE cl2 := SymTab.ClInt
- 2945                                               END;
- 2946                                               IF NOT SymTab.SetElemClassOk(cl)
- 2947                                                  OR (hasR AND NOT
- 2948                                                     SymTab.SetElemClassOk(cl2))
- 2949                                               THEN
- 2950                                                 SemError(222)
- 2951                                               ELSIF hasR
- 2952   AND SymTab.ConstInt(qe, v)
- 2953   AND SymTab.ConstInt(q2,
- 2954                                                     v2)
- 2955   AND ((v < lo)
- 2956                                                     OR (v2 < lo)
- 2957                                                     OR (v >= lo +
- 2958                                                        VAL(INTEGER, span))
- 2959                                                     OR (v2 >= lo +
- 2960                                                        VAL(INTEGER, span))
- 2961                                                     OR (v > v2)) THEN
- 2962                                                 SemError(222)
- 2963                                                ELSIF hasR THEN
- 2964                                                  QbeGen.SetRange(sq, qe, q2,
- 2965                                                    lo, span)
- 2966                                                ELSIF SymTab.ConstInt(qe,
- 2967                                                        v)
- 2968   AND ((v < lo)
- 2969                                                      OR (v >= lo +
- 2970                                                         VAL(INTEGER,
- 2971                                                           span))) THEN
- 2972                                                  SemError(222)
- 2973                                                ELSE QbeGen.SetBit(sq, qe,
- 2974                                                  lo, span)
- 2975                                               END
- 2976                                             END; .) .
- 2977    GetIdent<VAR n: SymTab.Name>
- 2978      = ident                             (. LexName(n); .) .
- 2979  
- 2980  END M2.
+ 2574                                               IF isHigh THEN
+ 2575                                                 DEC(c1)
+ 2576                                               END;
+ 2577                                               QbeGen.IntStr(c1, qr);
+ 2578                                               t := SymTab.IntType();
+ 2579                                               QbeGen.CopyOp(qr, q)
+ 2580                                             ELSIF dt = SymTab.InvalidType THEN
+ 2581                                               t := SymTab.InvalidType;
+ 2582                                               QbeGen.CopyOp("0", q)
+ 2583                                             ELSIF SymTab.ClassOf(dt) #
+ 2584                                                   SymTab.ClArray THEN
+ 2585                                               SemError(217);
+ 2586                                               t := SymTab.InvalidType;
+ 2587                                               QbeGen.CopyOp("0", q)
+ 2588                                             ELSE
+ 2589                                               IF isHigh THEN
+ 2590                                                 IF SymTab.IsOpenArray(dt) THEN
+ 2591                                                   QbeGen.OpenHi(qd, qr)
+ 2592                                                 ELSE
+ 2593                                                   QbeGen.IntStr(
+ 2594                                                     SymTab.ArrayHi(dt), qr)
+ 2595                                                 END
+ 2596                                               ELSE
+ 2597                                                 IF SymTab.IsOpenArray(dt) THEN
+ 2598                                                   QbeGen.LoadCount(qd, qr)
+ 2599                                                 ELSE
+ 2600                                                   QbeGen.IntStr(VAL(
+ 2601                                                     INTEGER,
+ 2602                                                     SymTab.ArrayLen(dt)),
+ 2603                                                     qr)
+ 2604                                                 END
+ 2605                                               END;
+ 2606                                                t := SymTab.IntType();
+ 2607                                                QbeGen.CopyOp(qr, q)
+ 2608                                              END; .)
+ 2609      | ( "SIZE" | "TSIZE" ) "(" Design<dt, dk, qd, qn, sfx> ")"
+ 2610                                          (. IF dt = SymTab.InvalidType THEN
+ 2611                                               t := SymTab.InvalidType;
+ 2612                                               QbeGen.CopyOp("0", q)
+ 2613                                             ELSE
+ 2614                                               QbeGen.IntStr(VAL(INTEGER,
+ 2615                                                 SymTab.ObjectSize(dt)), q);
+ 2616                                               t := SymTab.IntType()
+ 2617                                             END; .)
+ 2618      | ( "SHIFT"                         (. isMax := FALSE; .)
+ 2619        | "ROTATE"                        (. isMax := TRUE; .) )
+ 2620        "(" Expr<et, q> "," Expr<et2, q2> ")"
+ 2621                                          (. (* set shift/rotate: isMax
+ 2622                                                doubles as "rotate" *)
+ 2623                                             IF (et # SymTab.InvalidType)
+ 2624                                                AND (SymTab.ClassOf(et) =
+ 2625                                                   SymTab.ClSet) THEN
+ 2626                                               QbeGen.SetShift(q, q2,
+ 2627                                                 SymTab.SetWords(et),
+ 2628                                                 SymTab.SetCount(et), isMax,
+ 2629                                                 qt);
+ 2630                                               t := et;
+ 2631                                               QbeGen.CopyOp(qt, q)
+ 2632                                             ELSE SemError(230);
+ 2633                                               t := SymTab.InvalidType;
+ 2634                                               QbeGen.CopyOp("0", q)
+ 2635                                             END; .)
+ 2636      | ( "MIN"                           (. isMax := FALSE; .)
+ 2637        | "MAX"                           (. isMax := TRUE; .) )
+ 2638        "(" Design<dt, dk, qd, qn, sfx> ")"
+ 2639                                          (. IF (dt # SymTab.InvalidType)
+ 2640   AND (SymTab.ClassOf(dt) = SymTab.ClReal) THEN
+ 2641                                               (* REAL/LONGREAL: the
+ 2642                                                  implementation bounds *)
+ 2643                                               IF isMax THEN
+ 2644                                                 QbeGen.NormReal(
+ 2645                                                   "3.402823e38", q)
+ 2646                                               ELSE QbeGen.NormReal(
+ 2647                                                   "-3.402823e38", q)
+ 2648                                               END;
+ 2649                                               t := SymTab.RealType()
+ 2650                                             ELSIF (dt #
+ 2651                                                SymTab.InvalidType)
+ 2652   AND (SymTab.ClassOf(dt) =
+ 2653                                                   SymTab.ClLong) THEN
+ 2654                                               IF isMax THEN
+ 2655                                                 QbeGen.CopyOp(
+ 2656                                                   "9223372036854775807", q)
+ 2657                                               ELSE QbeGen.CopyOp(
+ 2658                                                   "-9223372036854775808", q)
+ 2659                                               END;
+ 2660                                               t := SymTab.LongType()
+ 2661                                             ELSIF SymTab.TypeBounds(dt, lo,
+ 2662                                                      hi) THEN
+ 2663                                               IF isMax THEN
+ 2664                                                 QbeGen.IntStr(hi, q)
+ 2665                                               ELSE QbeGen.IntStr(lo, q)
+ 2666                                               END;
+ 2667                                               t := SymTab.IntType()
+ 2668                                             ELSE SemError(230);
+ 2669                                               t := SymTab.InvalidType;
+ 2670                                               QbeGen.CopyOp("0", q)
+ 2671                                             END; .)
+ 2672      | "ADR" "(" Design<dt, dk, qd, qn, sfx> ")"
+ 2673                                          (. IF dt = SymTab.InvalidType THEN
+ 2674                                               t := SymTab.InvalidType;
+ 2675                                               QbeGen.CopyOp("0", q)
+ 2676                                             ELSE
+ 2677                                               IF sfx THEN
+ 2678                                                 QbeGen.CopyOp(qd, q)
+ 2679                                               ELSIF (dk = SymTab.KindVar)
+ 2680                                                  OR (dk = SymTab.KindParam) THEN
+ 2681                                                 QbeGen.AddrOf(qn, q)
+ 2682                                               ELSE SemError(230);
+ 2683                                                 QbeGen.CopyOp("0", q)
+ 2684                                               END;
+ 2685                                               t := SymTab.AddrType()
+ 2686                                             END; .)
+ 2687      | "CHR" "(" Expr<et, q> ")"
+ 2688                                          (. IF (et # SymTab.InvalidType)
+ 2689   AND NOT SymTab.IsIntFamily(et) THEN
+ 2690                                               SemError(211) END;
+ 2691                                             t := SymTab.CharType(); .)
+ 2692      | ( "ORD" | "ORDL" ) "(" Expr<et, q> ")"
+ 2693                                          (. IF et # SymTab.InvalidType THEN
+ 2694                                               IF (SymTab.ClassOf(et) #
+ 2695                                                   SymTab.ClChar)
+ 2696   AND (SymTab.ClassOf(et) #
+ 2697                                                     SymTab.ClBool)
+ 2698   AND (SymTab.ClassOf(et) #
+ 2699                                                     SymTab.ClEnum)
+ 2700   AND NOT SymTab.IsIntFamily(et) THEN
+ 2701                                                 SemError(211) END
+ 2702                                             END;
+ 2703                                             t := SymTab.IntType(); .)
+ 2704      | "CAP" "(" Expr<et, q> ")"
+ 2705                                          (. QbeGen.CapQ(q, qa);
+ 2706                                             QbeGen.CopyOp(qa, q);
+ 2707                                             t := SymTab.CharType(); .)
+ 2708      | "UCHR" "(" Expr<et, q> ")"
+ 2709                                          (. (* UCHR: the UCHAR constructor.
+ 2710                                                CHAR -> UCHAR (identity);
+ 2711                                                INTEGER familly -> UCHAR
+ 2712                                                (codepoint value). *)
+ 2713                                             IF (et # SymTab.InvalidType)
+ 2714    AND (SymTab.ClassOf(et) # SymTab.ClChar)
+ 2715    AND NOT SymTab.IsIntFamily(et) THEN
+ 2716                                               SemError(211) END;
+ 2717                                             t := SymTab.UCharType(); .)
+ 2718      | "CHR8" "(" Expr<et, q> ")"
+ 2719                                          (. IF (et # SymTab.InvalidType)
+ 2720    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
+ 2721                                               SemError(211) END;
+ 2722                                             QbeGen.WidenLong(q, qa);
+ 2723                                             QbeGen.CheckRange(qa, "0", "255");
+ 2724                                             t := SymTab.CharType(); .)
+ 2725      | "UORD" "(" Expr<et, q> ")"
+ 2726                                          (. (* UORD(u): the codepoint as a
+ 2727                                                32-bit ordinal (INTEGER),
+ 2728                                                cf. ORD for CHAR. *)
+ 2729                                             IF (et # SymTab.InvalidType)
+ 2730    AND (SymTab.ClassOf(et) # SymTab.ClUChar) THEN
+ 2731                                               SemError(211) END;
+ 2732                                             t := SymTab.IntType(); .)
+ 2733      | "ABS" "(" Expr<et, q> ")"
+ 2734                                          (. IF (et # SymTab.InvalidType)
+ 2735   AND NOT SymTab.IsIntFamily(et)
+ 2736   AND (SymTab.ClassOf(et) #
+ 2737                                                  SymTab.ClReal) THEN
+ 2738                                               SemError(211)
+ 2739                                             ELSE QbeGen.AbsQ(q, qa,
+ 2740                                                    SymTab.ClassOf(et) =
+ 2741                                                      SymTab.ClReal);
+ 2742                                               QbeGen.CopyOp(qa, q)
+ 2743                                             END;
+ 2744                                             t := et; .)
+ 2745      | "VAL" "(" GetIdent<vn> "," Expr<et, q> ")"
+ 2746                                          (. IF NOT SymTab.Lookup(vn) THEN
+ 2747                                               SemError(201);
+ 2748                                               t := SymTab.InvalidType
+ 2749                                             ELSE vt := SymTab.SymType(vn);
+ 2750                                               IF vt = SymTab.InvalidType THEN
+ 2751                                                 t := SymTab.InvalidType
+ 2752                                               ELSIF et =
+ 2753                                                  SymTab.InvalidType THEN
+ 2754                                                 t := vt
+ 2755                                               ELSE
+ 2756                                                 c1 := SymTab.ClassOf(et);
+ 2757                                                 c2 := SymTab.ClassOf(vt);
+ 2758                                                 IF (c1 = SymTab.ClInt)
+ 2759    AND (c2 = SymTab.ClLong) THEN
+ 2760                                                   QbeGen.WidenLong(q, qa);
+ 2761                                                   QbeGen.CopyOp(qa, q);
+ 2762                                                   t := vt
+ 2763                                                 ELSIF (c1 = SymTab.ClLong)
+ 2764    AND (c2 = SymTab.ClInt) THEN
+ 2765                                                   QbeGen.NarrowLong(q, qa);
+ 2766                                                   QbeGen.CopyOp(qa, q);
+ 2767                                                   t := vt
+ 2768                                                 ELSIF (c1 = SymTab.ClInt)
+ 2769    AND (c2 = SymTab.ClReal) THEN
+ 2770                                                   QbeGen.ConvIR(q, qa);
+ 2771                                                   QbeGen.CopyOp(qa, q);
+ 2772                                                   t := vt
+ 2773                                                 ELSIF (c1 = SymTab.ClLong)
+ 2774    AND (c2 = SymTab.ClReal) THEN
+ 2775                                                   QbeGen.ConvLR(q, qa);
+ 2776                                                   QbeGen.CopyOp(qa, q);
+ 2777                                                   t := vt
+ 2778                                                 ELSIF (c1 = SymTab.ClReal)
+ 2779    AND (c2 = SymTab.ClInt) THEN
+ 2780                                                   QbeGen.ConvRI(q, qa);
+ 2781                                                   QbeGen.CopyOp(qa, q);
+ 2782                                                   t := vt
+ 2783                                                 ELSIF (c1 = SymTab.ClReal)
+ 2784    AND (c2 = SymTab.ClLong) THEN
+ 2785                                                   QbeGen.ConvRL(q, qa);
+ 2786                                                   QbeGen.CopyOp(qa, q);
+ 2787                                                   t := vt
+ 2788                                                 ELSIF ((c1 = SymTab.ClInt)
+ 2789                                                     OR (c1 =
+ 2790                                                        SymTab.ClChar)
+ 2791                                                     OR (c1 =
+ 2792                                                        SymTab.ClBool)
+ 2793                                                     OR (c1 =
+ 2794                                                        SymTab.ClEnum))
+ 2795   AND ((c2 = SymTab.ClInt)
+ 2796                                                     OR (c2 =
+ 2797                                                        SymTab.ClChar)
+ 2798                                                     OR (c2 =
+ 2799                                                        SymTab.ClBool)
+ 2800                                                     OR (c2 =
+ 2801                                                        SymTab.ClEnum)) THEN
+ 2802                                                   t := vt
+ 2803                                                 ELSIF (c1 = SymTab.ClPtr)
+ 2804   AND (c2 = SymTab.ClPtr) THEN
+ 2805                                                   t := vt
+ 2806                                                 ELSIF (c1 = SymTab.ClReal)
+ 2807   AND (c2 = SymTab.ClReal) THEN
+ 2808                                                   t := vt
+ 2809                                                 ELSE SemError(230);
+ 2810                                                   t := SymTab.InvalidType
+ 2811                                                 END
+ 2812                                               END
+ 2813                                             END; .)
+ 2814      | "(" Expr<et, q> ")"               (. t := et; .)
+ 2815      | SetLit<st, sq>                    (. t := st;
+ 2816                                             QbeGen.CopyOp(sq, q); .)
+ 2817      | ( "NOT" | "~" ) Fact<t2, q2>      (. IF SymTab.BoolCheck(t2) THEN
+ 2818                                               t := SymTab.BoolType()
+ 2819                                             ELSE SemError(212);
+ 2820                                               t := SymTab.InvalidType END;
+ 2821                                             IF t # SymTab.InvalidType THEN
+ 2822                                               QbeGen.NotQ(q2, q)
+ 2823                                             ELSE QbeGen.CopyOp("0", q)
+ 2824                                             END; .) .
+ 2825    (* Set literals are SET OF [0..255] (8 words); elements validated
+ 2826       0..255 statically when foldable (222 otherwise), runtime trap
+ 2827       for computed elements. Ranges always lower via SetRange. *)
+ 2828    SetLit<VAR t: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2829      = "{"                               (. t := SymTab.NewSet(
+ 2830                                               SymTab.NewSubR(0, 255));
+ 2831                                             QbeGen.NewSetTemp(8, q);
+ 2832                                             QbeGen.SetZero(q, 8); .)
+ 2833        [ SetElem<t, q> { "," SetElem<t, q> } ]
+ 2834        "}" .
+ 2835    (* Typed brace constructor: TypeName{ elems } — BITSET{0} (a set)
+ 2836       or ArrayName{...} (an array constructor, GNU Modula-2).  The
+ 2837       declared type sets the width (set) or element type (array). *)
+ 2838    TypedBraceLit<vt: SymTab.TypeIndex; VAR q: QbeGen.QVal>
+ 2839                                          (. VAR nw: CARDINAL;
+ 2840                                               savedCls: INTEGER; .)
+ 2841      = "{"                               (. savedCls := braceCls;
+ 2842                                             IF vt = SymTab.InvalidType THEN
+ 2843                                               braceCls := -1
+ 2844                                             ELSE braceCls :=
+ 2845                                                    SymTab.ClassOf(vt)
+ 2846                                             END;
+ 2847                                             IF braceCls = SymTab.ClSet THEN
+ 2848                                               IF vt = SymTab.InvalidType THEN
+ 2849                                                 nw := 8
+ 2850                                               ELSE nw := SymTab.SetWords(vt);
+ 2851                                                 IF nw = 0 THEN nw := 8 END
+ 2852                                               END;
+ 2853                                               QbeGen.NewSetTemp(nw, q);
+ 2854                                               QbeGen.SetZero(q, nw)
+ 2855                                             ELSIF (braceCls =
+ 2856                                                    SymTab.ClArray)
+ 2857                                                OR (braceCls =
+ 2858                                                    SymTab.ClRecord)
+ 2859                                                OR (braceCls =
+ 2860                                                    SymTab.ClClass) THEN
+ 2861                                               QbeGen.CtorBegin(vt)
+ 2862                                             ELSE
+ 2863                                               IF vt # SymTab.InvalidType THEN
+ 2864                                                 SemError(230) END;
+ 2865                                               braceCls := -1
+ 2866                                             END; .)
+ 2867        [ BraceElem<vt, q> { "," BraceElem<vt, q> } ]
+ 2868        "}"                               (. IF (braceCls = SymTab.ClArray)
+ 2869                                                OR (braceCls =
+ 2870                                                   SymTab.ClRecord)
+ 2871                                                OR (braceCls =
+ 2872                                                   SymTab.ClClass) THEN
+ 2873                                               QbeGen.CtorEnd(q)
+ 2874                                             ELSIF braceCls # SymTab.ClSet THEN
+ 2875                                               QbeGen.CopyOp("0", q)
+ 2876                                             END;
+ 2877                                             braceCls := savedCls; .) .
+ 2878    BraceElem<vt: SymTab.TypeIndex; VAR sq: QbeGen.QVal>
+ 2879                                          (. VAR et, et2: SymTab.TypeIndex;
+ 2880                                               qe, q2: QbeGen.QVal;
+ 2881                                               v, v2, reps, k: INTEGER;
+ 2882                                               elem: SymTab.TypeIndex;
+ 2883                                               lo: INTEGER;
+ 2884                                               span: CARDINAL;
+ 2885                                               cl, cl2: INTEGER;
+ 2886                                               hasR, hasB: BOOLEAN; .)
+ 2887      =                                   (. hasR := FALSE; hasB := FALSE; .)
+ 2888        Expr<et, qe>
+ 2889        [ ".." Expr<et2, q2>              (. hasR := TRUE; .) ]
+ 2890        [ "BY" Expr<et2, q2>              (. hasB := TRUE; .) ]
+ 2891                                          (. IF braceCls = SymTab.ClSet THEN
+ 2892                                               IF hasB THEN SemError(230) END;
+ 2893                                               lo := SymTab.SetBaseLo(vt);
+ 2894                                               span := SymTab.SetCount(vt);
+ 2895                                               IF (et = SymTab.InvalidType)
+ 2896                                                  OR (hasR AND (et2 =
+ 2897                                                     SymTab.InvalidType)) THEN
+ 2898                                               ELSE cl :=
+ 2899                                                      SymTab.ClassOf(et);
+ 2900                                                 IF hasR THEN
+ 2901                                                   cl2 :=
+ 2902                                                     SymTab.ClassOf(et2)
+ 2903                                                 ELSE cl2 := SymTab.ClInt
+ 2904                                                 END;
+ 2905                                                 IF NOT SymTab.SetElemClassOk(cl)
+ 2906                                                    OR (hasR AND NOT
+ 2907                                                       SymTab.SetElemClassOk(cl2))
+ 2908                                                 THEN
+ 2909                                                   SemError(222)
+ 2910                                                 ELSIF hasR
+ 2911   AND SymTab.ConstInt(qe, v)
+ 2912   AND SymTab.ConstInt(q2,
+ 2913                                                       v2)
+ 2914   AND ((v < lo)
+ 2915                                                       OR (v2 < lo)
+ 2916                                                       OR (v >= lo +
+ 2917                                                          VAL(INTEGER, span))
+ 2918                                                       OR (v2 >= lo +
+ 2919                                                          VAL(INTEGER, span))
+ 2920                                                       OR (v > v2)) THEN
+ 2921                                                   SemError(222)
+ 2922                                                  ELSIF hasR THEN
+ 2923                                                    QbeGen.SetRange(sq, qe, q2,
+ 2924                                                      lo, span)
+ 2925                                                  ELSIF SymTab.ConstInt(qe,
+ 2926                                                          v)
+ 2927   AND ((v < lo)
+ 2928                                                        OR (v >= lo +
+ 2929                                                           VAL(INTEGER,
+ 2930                                                             span))) THEN
+ 2931                                                    SemError(222)
+ 2932                                                  ELSE QbeGen.SetBit(sq, qe,
+ 2933                                                    lo, span)
+ 2934                                                 END
+ 2935                                               END
+ 2936                                             ELSIF (braceCls = SymTab.ClArray)
+ 2937                                                OR (braceCls =
+ 2938                                                   SymTab.ClRecord)
+ 2939                                                OR (braceCls =
+ 2940                                                   SymTab.ClClass) THEN
+ 2941                                               IF hasR THEN SemError(230) END;
+ 2942                                               reps := 1;
+ 2943                                               IF hasB THEN
+ 2944                                                 IF SymTab.ConstInt(q2, v2)
+ 2945   AND (v2 >= 1) THEN
+ 2946                                                   reps := v2
+ 2947                                                 ELSE SemError(230)
+ 2948                                                 END
+ 2949                                               END;
+ 2950                                               k := 0;
+ 2951                                               WHILE k < reps DO
+ 2952                                                 QbeGen.CtorElem(qe);
+ 2953                                                 INC(k)
+ 2954                                               END
+ 2955                                             END; .) .
+ 2956    SetElem<st: SymTab.TypeIndex; sq: QbeGen.QVal>         (. VAR et, et2: SymTab.TypeIndex;
+ 2957                                               qe, q2: QbeGen.QVal;
+ 2958                                               v, v2: INTEGER;
+ 2959                                               lo: INTEGER;
+ 2960                                               span: CARDINAL;
+ 2961                                               cl, cl2: INTEGER;
+ 2962                                               hasR: BOOLEAN; .)
+ 2963      =                                   (. hasR := FALSE; .)
+ 2964        Expr<et, qe>
+ 2965        [ ".." Expr<et2, q2>              (. hasR := TRUE; .) ]
+ 2966                                          (. lo := SymTab.SetBaseLo(st);
+ 2967                                             span := SymTab.SetCount(st);
+ 2968                                             IF (et = SymTab.InvalidType)
+ 2969                                                OR (hasR AND (et2 =
+ 2970                                                   SymTab.InvalidType)) THEN
+ 2971                                             ELSE cl :=
+ 2972                                                    SymTab.ClassOf(et);
+ 2973                                               IF hasR THEN
+ 2974                                                 cl2 :=
+ 2975                                                   SymTab.ClassOf(et2)
+ 2976                                               ELSE cl2 := SymTab.ClInt
+ 2977                                               END;
+ 2978                                               IF NOT SymTab.SetElemClassOk(cl)
+ 2979                                                  OR (hasR AND NOT
+ 2980                                                     SymTab.SetElemClassOk(cl2))
+ 2981                                               THEN
+ 2982                                                 SemError(222)
+ 2983                                               ELSIF hasR
+ 2984   AND SymTab.ConstInt(qe, v)
+ 2985   AND SymTab.ConstInt(q2,
+ 2986                                                     v2)
+ 2987   AND ((v < lo)
+ 2988                                                     OR (v2 < lo)
+ 2989                                                     OR (v >= lo +
+ 2990                                                        VAL(INTEGER, span))
+ 2991                                                     OR (v2 >= lo +
+ 2992                                                        VAL(INTEGER, span))
+ 2993                                                     OR (v > v2)) THEN
+ 2994                                                 SemError(222)
+ 2995                                                ELSIF hasR THEN
+ 2996                                                  QbeGen.SetRange(sq, qe, q2,
+ 2997                                                    lo, span)
+ 2998                                                ELSIF SymTab.ConstInt(qe,
+ 2999                                                        v)
+ 3000   AND ((v < lo)
+ 3001                                                      OR (v >= lo +
+ 3002                                                         VAL(INTEGER,
+ 3003                                                           span))) THEN
+ 3004                                                  SemError(222)
+ 3005                                                ELSE QbeGen.SetBit(sq, qe,
+ 3006                                                  lo, span)
+ 3007                                               END
+ 3008                                             END; .) .
+ 3009    GetIdent<VAR n: SymTab.Name>
+ 3010      = ident                             (. LexName(n); .) .
+ 3011  
+ 3012  END M2.
 
     0 errors
 

compiler/src/SymTab.def

@@ -432,6 +432,11 @@ PROCEDURE ForwardType (name: ARRAY OF CHAR): TypeIndex;
 
 PROCEDURE IsUnresolved (t: TypeIndex): BOOLEAN;
 (* TRUE for a forward placeholder whose target is not yet declared. *)
+PROCEDURE FwdPending (): CARDINAL;
+PROCEDURE FwdInfo (i: CARDINAL; VAR name: Name; VAR unresolved: BOOLEAN);
+(* Module-level forward type references: enumerate them at module end
+   and flag those never completed (undeclared type). *)
+PROCEDURE FwdClear;
 
 PROCEDURE IntType (): TypeIndex;
 PROCEDURE UCharType (): TypeIndex;

compiler/src/SymTab.mod

@@ -87,6 +87,10 @@ VAR
   tlo : ARRAY [0 .. MaxTypes - 1] OF INTEGER;
   thi : ARRAY [0 .. MaxTypes - 1] OF INTEGER;
   tenum : ARRAY [0 .. MaxTypes - 1] OF CARDINAL; (* enum literal count *)
+  (* module-level forward type references awaiting completion *)
+  pfwdN : CARDINAL;
+  pfwdName : ARRAY [0 .. 255] OF Name;
+  pfwdT : ARRAY [0 .. 255] OF TypeIndex;
   tparent : ARRAY [0 .. MaxTypes - 1] OF TypeIndex;
   tscope : ARRAY [0 .. MaxTypes - 1] OF ScopePtr;
   tdone : ARRAY [0 .. MaxTypes - 1] OF BOOLEAN;
@@ -2366,9 +2370,30 @@ PROCEDURE ForwardType (name: ARRAY OF CHAR): TypeIndex;
     IF NOT Enter(name, KindType) THEN RETURN InvalidType END;
     t := NewAlias();
     SetSymType(name, t);
+    IF (typeBlockDepth = 0) AND (pfwdN <= HIGH(pfwdName)) THEN
+      Assign(pfwdName[pfwdN], name);
+      pfwdT[pfwdN] := t;
+      INC(pfwdN)
+    END;
     RETURN t
   END ForwardType;
 
+PROCEDURE FwdPending (): CARDINAL;
+  BEGIN RETURN pfwdN END FwdPending;
+
+PROCEDURE FwdInfo (i: CARDINAL; VAR name: Name; VAR unresolved: BOOLEAN);
+  BEGIN
+    name[0] := CHR(0);
+    unresolved := FALSE;
+    IF i < pfwdN THEN
+      Assign(name, pfwdName[i]);
+      unresolved := Resolve(pfwdT[i]) = InvalidType
+    END
+  END FwdInfo;
+
+PROCEDURE FwdClear;
+  BEGIN pfwdN := 0 END FwdClear;
+
 PROCEDURE QualNode (mod, name: ARRAY OF CHAR): SymPtr;
   VAR i : INTEGER;
   BEGIN
@@ -2966,8 +2991,6 @@ PROCEDURE Init;
     Predef("CARDINAL16", KindPredef, dCard);
     Predef("CARDINAL32", KindPredef, dCard);
     Predef("CARDINAL64", KindPredef, dLong);
-    (* gm2's pervasive opaque dynamic-string type (pointer-sized). *)
-    Predef("String", KindPredef, dAddr);
     Predef("NIL", KindConst, dNil)
   END Init;
 

compiler/tests/d_string.def

@@ -0,0 +1,8 @@
+DEFINITION MODULE DString;
+(* gm2-style opaque dynamic string: TYPE String; completed in the
+   implementation (DynamicStrings model). *)
+TYPE String;
+PROCEDURE Make(n : INTEGER) : String;
+PROCEDURE Get(s : String) : INTEGER;
+PROCEDURE IsNil(s : String) : BOOLEAN;
+END DString.

compiler/tests/d_string.mod

@@ -0,0 +1,11 @@
+IMPLEMENTATION MODULE DString;
+(* Completes the opaque String here; clients see only the opaque type. *)
+TYPE String = POINTER TO RECORD v : INTEGER END;
+PROCEDURE Make(n : INTEGER) : String;
+VAR s : String;
+BEGIN NEW(s); s^.v := n; RETURN s END Make;
+PROCEDURE Get(s : String) : INTEGER;
+BEGIN RETURN s^.v END Get;
+PROCEDURE IsNil(s : String) : BOOLEAN;
+BEGIN RETURN s = NIL END IsNil;
+END DString.

compiler/tests/t_string.mod

@@ -1,8 +1,11 @@
-MODULE tstring;
-// gm2's pervasive opaque String type (pointer-like).
+MODULE TString;
+// gm2-style opaque String, imported (not pervasive): value ops on an
+// opaque type are pointer-like.
+FROM DString IMPORT String, Make, Get, IsNil;
 VAR s, t : String;
 VAR ExitCode : INTEGER;
 BEGIN
-  s := NIL; t := s;
-  IF (s = NIL) AND (t = NIL) THEN ExitCode := 42 ELSE ExitCode := 1 END
-END tstring.
+  s := Make(42);
+  t := s;
+  IF (Get(t) = 42) AND NOT IsNil(t) THEN ExitCode := 42 ELSE ExitCode := 1 END
+END TString.

docs/analysis_gaps.md

@@ -1,12 +1,12 @@
 # m2compiler-V3 — gap analysis (2026-09-30)
 
-Suite **169/169**, self-hosting fixpoint OK (2,730,510 bytes).
+Suite **169/169**, self-hosting fixpoint OK (2,754,353 bytes).
 Corpus at this point (with `$V3_LIBS`):
 
 | corpus | compile-OK | CRASH | LANG |
 | --- | --- | --- | --- |
-| gm2 testsuite (612) | 395 | 0 | 209 |
-| gm2 stdlib (336) | 131 | 0 | 205 |
+| gm2 testsuite (612) | 392 | 0 | 212 |
+| gm2 stdlib (336) | 127 | 0 | 209 |
 
 Failure taxonomy (testsuite, per file): `undeclared identifier` 65,
 `not supported yet` 43, `invalid call` 25, `incompatible assignment`
@@ -46,7 +46,10 @@ Ranked by corpus impact (each verified by a failing file or a probe):
    sized-bit names (`INCL`/`EXCL`/`SHIFT` recur).
 5. **Enum subranges / BOOLEAN bounds** — `[a..d]`,
    `ARRAY [FALSE..TRUE] …` are `230`.
-6. **`String`** (gm2 magic type) — used throughout the stdlib corpus.
+6. **`String`** — *not* a gm2 built-in: it is an opaque type imported
+   from a definition module (`DynamicStrings`, or a local `opaque`).
+   V3 now treats unresolved (opaque/forward) aliases as pointer-like,
+   which is the real fix.
 7. **`GOTO` + labels** — parse error.
 8. **Whole-variant-record assignment/equality** — deliberately `236`.
 9. **Nested local `MODULE`** — parsed, not lowered.
@@ -101,7 +104,7 @@ hex, `NOT`/`AND`/`OR` only, TopSpeed legacy isolated in the sidecar.
 5. ~~**Forward type references**~~ ✅ (module-level globals; TYPE-block
    forwards already worked)
 
-Also done: `String` (opaque/pointer-like), variant-record
+Also done: opaque/pointer-like types (incl. `String`), variant-record
 assignment (flat blit), nested-`MODULE` lowering, `ADDRESS`↔pointer
 assignment.
 

docs/features.md

@@ -60,9 +60,11 @@ Legend: ✅ done · 🔄 partial · ⏸ not started / deferred.
 - ✅ Variant records (`RECORD CASE … OF … END`); whole-record
   assignment is a flat byte blit (correct for overlapping fields) and
   whole-record `=` is 213.
-- ✅ gm2's pervasive opaque `String`: an undeclared/opaque type is
-  pointer-like (assign `NIL`, copy, compare, pass), and `String` is
-  predefined (imported definitions shadow it).
+- ✅ Opaque/forward types used as values: an unresolved (opaque or
+  forward) alias is pointer-like (assign `NIL`, copy, compare, pass).
+  gm2's `String` is **not** built in — it is an opaque type imported
+  from a definition module (`DynamicStrings`, or a local `opaque`);
+  an undeclared type name is an error as in gm2.
 
 ## Declarations
 - ✅ `CONST` (integer/char/real literals, folded), `VAR`, `TYPE`,

docs/summary_string-variant-nested.md

@@ -1,6 +1,6 @@
 # Session summary — 2026-09-30 (b): constructors, corpus gaps, String/variant/nested
 
-Suite **169/169**; self-hosting fixpoint **OK** (image **2,730,510
+Suite **169/169**; self-hosting fixpoint **OK** (image **2,754,353
 bytes**). `master`, tree clean except the user's uncommitted
 `compiler/toto.mod`.
 
@@ -50,8 +50,10 @@ nine corpus-driven gaps.
 
 - **Opaque/forward/undeclared aliases are pointer-like** — `ClassOf`
   returns `ClPtr` for an unresolved alias, so `Design`/`DeclVar`/
-  `ResClass`/`AssOrCall` treat them as pointers; gm2's pervasive
-  **`String`** is predefined (imported definitions shadow it).
+  `ResClass`/`AssOrCall` treat them as pointers.  This is what gm2's
+  opaque **`String`** needs: `String` is *not* built-in, it is an
+  opaque type imported from a definition module (`DynamicStrings`, or a
+  local `opaque`); an undeclared type name is an error, as in gm2.
 - **Variant-record assignment** — `CopyRecord` is a flat byte blit of
   `TypeSize(t)` (records are flat blobs; the only correct choice for
   overlapping variant fields); variant records are emitted as one
@@ -69,6 +71,7 @@ nine corpus-driven gaps.
 | `v3-ctor-gaps` | 301 | 115 |
 | `v3-gaps-1-5` | 376 | 124 |
 | `v3-string-variant-nested` | **395** | **131** |
+| after conformant `String` cleanup | **392** | **127** |
 
 CRASH 0 throughout.  Remaining testsuite taxonomy: `undeclared
 identifier` 65, `not supported yet` 34, `invalid call` 27,

docs/summary_v3-corpus.md

@@ -22,19 +22,19 @@ gap).
 
 | | no libs | with `$V3_LIBS` |
 | --- | --- | --- |
-| **compile-OK** | 242 | **395** |
+| **compile-OK** | 242 | **392** |
 | CRASH | 0 | 0 |
 | LIB | 185 | **9** |
-| LANG | 185 | **209** |
+| LANG | 185 | **212** |
 
 **2. gm2 standard libraries** (`m2pim`/`m2iso`/`m2log`/`m2cor`/`m2min`,
 336 files):
 
 | | no libs | with `$V3_LIBS` |
 | --- | --- | --- |
-| **compile-OK** | 78 | **131** |
+| **compile-OK** | 78 | **127** |
 | LIB | 176 | **0** |
-| LANG | 82 | **205** |
+| LANG | 82 | **209** |
 
 (With the import path set, LIB noise is gone and the true LANG counts
 are visible.)
@@ -104,9 +104,13 @@ are visible.)
 17. **Module-level forward type references** — a global may name a type
     declared further down; emission is deferred until the TYPE block
     completes (TYPE-block forwards already worked).
-18. **`String` and opaque/forward types** — an undeclared or opaque
-    alias is pointer-like (`NIL`, copy, compare, pass); gm2's pervasive
-    `String` is predefined (imported definitions shadow it).
+18. **`String` and opaque/forward types** — an unresolved (opaque or
+    forward) alias is pointer-like (assign `NIL`, copy, compare, pass),
+    which is what gm2's opaque `String` needs.  `String` is **not**
+    built-in: it is imported from a definition module
+    (`DynamicStrings`/`opaque`), as in gm2.  An undeclared type name at
+    module level is reported (`201`, undeclared identifier) once the
+    module's TYPE declarations are known (`FwdPending`/`FwdInfo`).
 19. **Variant-record assignment** — whole-record assignment is now a
     flat byte blit of the (max) record size, correct for overlapping
     variant fields; variant records are emitted as a zeroed blob.