DEFINITION MODULE CompilerSymbols ;

(* Symbol table management: entry type, storage, insertion, lookup and scope
   hiding.  Compiler.mod imports these names unqualified. *)

FROM CompilerShared IMPORT MaxName ;

CONST
   MaxSym  = 3000 ;

TYPE
   SymEntry =
      RECORD
         name   : ARRAY [0..MaxName] OF CHAR ;
         tag    : CARDINAL ;
         cls    : CARDINAL ;
         size   : CARDINAL ;
         elem   : CARDINAL ;
         off    : CARDINAL ;
         lval   : LONGINT ;
         lo, hi : LONGINT ;         (* an ORDINAL type's bounds: an enumeration
                                       (0..n-1) or a subrange.  Needed so
                                       `set of T' can size its base. *)
         fldFirst, fldLast : CARDINAL ;  (* a RECORD type's field range in the
                                       field table (0,0 when not a record) *)
         arrIdx : CARDINAL ;        (* an ARRAY type's shape in ArrRec (0 = no) *)
         parmFirst, parmCount : CARDINAL ;  (* a PROCEDURE/FUNCTION's parameters:
                                       symtab indices, in declaration order *)
         isKbd  : BOOLEAN ;          (* the predefined KBD file: reads are console *)
         isPort : BOOLEAN ;          (* the predefined PORT byte array *)
         isVar  : BOOLEAN ;          (* a VAR parameter: the slot holds an address *)
         level  : CARDINAL ;
         local  : BOOLEAN ;
         parent : CARDINAL ;       (* lexical parent procedure, 0 at top level *)
         staticOff : CARDINAL ;    (* nested proc's hidden static-link local *)
         resvar : CARDINAL ;
         goPos  : CARDINAL ;
         defnd  : BOOLEAN ;
         fwd    : BOOLEAN ;
      END ;

VAR
   symtab : ARRAY [0..MaxSym - 1] OF SymEntry ;
   symTop : CARDINAL ;
   lexnest : CARDINAL ;
   wrd : ARRAY [0..MaxName] OF CHAR ;

PROCEDURE CopyWord (name : ARRAY OF CHAR) ;
PROCEDURE SaveWord (VAR dst : ARRAY OF CHAR) ;
PROCEDURE NewSym (name : ARRAY OF CHAR ; tag : CARDINAL ;
                  cls, size, elem, off : CARDINAL ; v : LONGINT ;
                  local : BOOLEAN) : CARDINAL ;
PROCEDURE Search (nm : ARRAY OF CHAR ; VAR idx : CARDINAL) : BOOLEAN ;
PROCEDURE DupTest (nm : ARRAY OF CHAR) ;
PROCEDURE HideLocals (from : CARDINAL) ;

END CompilerSymbols.