PL0-GNU-M2/ObjectTable.def

DEFINITION MODULE ObjectTable;		(* gf  03.08.88 (pl0) *)

FROM Scanner   IMPORT IDENT, STRING, POSITION;
FROM Generator IMPORT Label;

(*EXPORT QUALIFIED Object, ObjKind, ObjType,
		 Undefined, Integer,
		 EnterBlock, LeaveBlock,
		 EnterDecl, FindDecl, GetObjType,
		 InitObjectTable;
*)


TYPE Object   = POINTER TO Objectvalue;

TYPE ObjType  = Object;

TYPE ObjKind  = (newObject, undefined,
		 simpleType,
		 constant, stringConst,
		 variable,
		 procedure,
		 block);

TYPE Objectvalue =
	     RECORD
		id	: IDENT;
		nextObj : Object;
		level	: CARDINAL;
		CASE kind : ObjKind OF
		  newObject:
		| undefined:
		| simpleType:
		| constant:
			cType	: Object;
			cVal	: CARDINAL
		| stringConst:
			strVal	: STRING;
		| variable:
			vType	: Object;
			vAdr	: CARDINAL
		| procedure:
			procAdr : Label;
		| block:
			lastObj,
			down	: Object;
		END
	     END;

VAR Undefined : ObjType;
    Integer   : ObjType;


PROCEDURE EnterDecl  (id: IDENT; pos: POSITION) : Object;
PROCEDURE FindDecl   (id: IDENT; pos: POSITION) : Object;
PROCEDURE GetObjType (obj : Object)		: ObjType;

PROCEDURE EnterBlock(): CARDINAL;	(* retuns nesting level *)
PROCEDURE LeaveBlock(): CARDINAL;	(*	    "           *)
PROCEDURE InitObjectTable(): CARDINAL;	(*	    "           *)

END ObjectTable.