564 lines
9.8 KiB
Plaintext
564 lines
9.8 KiB
Plaintext
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Ceriel J.H. Jacobs
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*/
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/* D E C L A R A T I O N S */
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/* $Header$ */
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{
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#include "debug.h"
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#include <em_arith.h>
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#include <em_label.h>
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#include <alloc.h>
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#include <assert.h>
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#include "strict3rd.h"
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#include "idf.h"
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#include "LLlex.h"
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#include "def.h"
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#include "type.h"
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#include "scope.h"
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#include "node.h"
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#include "misc.h"
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#include "main.h"
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#include "chk_expr.h"
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#include "warning.h"
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#include "nostrict.h"
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int proclevel = 0; /* nesting level of procedures */
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int return_occurred; /* set if a return occurs in a block */
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extern t_node *EmptyStatement;
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#define needs_static_link() (proclevel > 1)
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}
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/* inline in declaration: need space
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* ProcedureDeclaration
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* {
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* t_def *df;
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* } :
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* { ++proclevel; }
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* ProcedureHeading(&df, D_PROCEDURE)
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* ';' block(&(df->prc_body))
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* IDENT
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* { EndProc(df, dot.TOK_IDF);
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* --proclevel;
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* }
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* ;
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*/
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ProcedureHeading(t_def **pdf; int type;)
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{
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t_type *tp = 0;
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arith parmaddr = needs_static_link() ? pointer_size : 0;
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t_param *pr = 0;
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} :
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PROCEDURE IDENT
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{ *pdf = DeclProc(type, dot.TOK_IDF); }
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[
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'('
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[
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FPSection(&pr, &parmaddr)
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[
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';' FPSection(&pr, &parmaddr)
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]*
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]
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')'
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[ ':' qualtype(&tp)
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]
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]
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{ CheckWithDef(*pdf, proc_type(tp, pr, parmaddr));
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#ifndef NOSTRICT
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if (tp && IsConstructed(tp)) {
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warning(W_STRICT, "procedure \"%s\" has a constructed result type",
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(*pdf)->df_idf->id_text);
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}
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#endif
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}
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;
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block(t_node **pnd;) :
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[ %persistent
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declaration
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]*
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{ return_occurred = 0; }
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[ %default
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BEGIN
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StatementSequence(pnd)
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{ *pnd = EmptyStatement; }
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]
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END
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;
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declaration
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{
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t_def *df;
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} :
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CONST [ ConstantDeclaration ';' ]*
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TYPE [ TypeDeclaration ';' ]*
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VAR [ VariableDeclaration ';' ]*
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{ ++proclevel; }
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ProcedureHeading(&df, D_PROCEDURE)
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';'
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block(&(df->prc_body))
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IDENT
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{ EndProc(df, dot.TOK_IDF);
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--proclevel;
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}
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';'
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ModuleDeclaration ';'
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;
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/* inline in procedureheading: need space
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* FormalParameters(t_param **ppr; arith *parmaddr; t_type **ptp;):
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* '('
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* [
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* FPSection(ppr, parmaddr)
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* [
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* ';' FPSection(ppr, parmaddr)
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* ]*
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* |
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* ]
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* ')'
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* [ ':' qualtype(ptp)
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* |
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* ]
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* ;
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*/
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FPSection(t_param **ppr; arith *parmaddr;)
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{
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t_node *FPList;
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t_type *tp;
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int VARp;
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} :
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var(&VARp) IdentList(&FPList) ':' FormalType(&tp)
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{ EnterParamList(ppr, FPList, tp, VARp, parmaddr); }
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;
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FormalType(t_type **ptp;)
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{
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extern arith ArrayElSize();
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} :
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ARRAY OF qualtype(ptp)
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{ /* index type of conformant array is "CARDINAL".
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Recognize a conformant array by size 0.
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*/
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register t_type *tp = construct_type(T_ARRAY, card_type);
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tp->arr_elem = *ptp;
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*ptp = tp;
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tp->arr_elsize = ArrayElSize(tp->arr_elem);
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tp->tp_align = tp->arr_elem->tp_align;
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}
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qualtype(ptp)
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;
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TypeDeclaration
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{
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t_def *df;
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t_type *tp;
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register t_node *nd;
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}:
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IDENT { df = define(dot.TOK_IDF, CurrentScope, D_TYPE);
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nd = dot2leaf(Name);
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}
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'=' type(&tp)
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{ DeclareType(nd, df, tp);
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FreeNode(nd);
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}
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;
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type(register t_type **ptp;):
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%default SimpleType(ptp)
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ArrayType(ptp)
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RecordType(ptp)
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SetType(ptp)
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PointerType(ptp)
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ProcedureType(ptp)
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;
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SimpleType(register t_type **ptp;)
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{
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t_type *tp;
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} :
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qualtype(ptp)
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[
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/* nothing */
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SubrangeType(&tp)
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/* The subrange type is given a base type by the
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qualident (this is new modula-2).
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*/
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{ chk_basesubrange(tp, *ptp); *ptp = tp; }
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]
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enumeration(ptp)
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SubrangeType(ptp)
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;
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enumeration(t_type **ptp;)
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{
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t_node *EnumList;
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} :
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'(' IdentList(&EnumList) ')'
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{ *ptp = enum_type(EnumList); }
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;
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IdentList(t_node **p;)
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{
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register t_node *q;
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} :
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IDENT { *p = q = dot2leaf(Value); }
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[ %persistent
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',' IDENT
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{ q->nd_left = dot2leaf(Value);
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q = q->nd_left;
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}
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]*
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{ q->nd_left = 0; }
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;
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SubrangeType(t_type **ptp;)
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{
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t_node *nd1, *nd2;
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}:
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/*
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This is not exactly the rule in the new report, but see
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the rule for "SimpleType".
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*/
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'[' ConstExpression(&nd1)
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UPTO ConstExpression(&nd2)
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']'
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{ *ptp = subr_type(nd1, nd2);
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FreeNode(nd1);
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FreeNode(nd2);
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}
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;
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ArrayType(t_type **ptp;)
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{
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t_type *tp;
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register t_type *tp2;
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} :
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ARRAY SimpleType(&tp)
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{ *ptp = tp2 = construct_type(T_ARRAY, tp); }
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[
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',' SimpleType(&tp)
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{ tp2->arr_elem = construct_type(T_ARRAY, tp);
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tp2 = tp2->arr_elem;
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}
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]* OF type(&tp)
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{ tp2->arr_elem = tp;
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ArraySizes(*ptp);
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}
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;
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RecordType(t_type **ptp;)
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{
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register t_scope *scope;
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arith size = 0;
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int xalign = struct_align;
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}
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:
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RECORD
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{ scope = open_and_close_scope(OPENSCOPE); }
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FieldListSequence(scope, &size, &xalign)
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{ if (size == 0) {
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warning(W_ORDINARY, "empty record declaration");
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size = 1;
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}
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*ptp = standard_type(T_RECORD, xalign, size);
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(*ptp)->rec_scope = scope;
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}
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END
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;
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FieldListSequence(t_scope *scope; arith *cnt; int *palign;):
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FieldList(scope, cnt, palign)
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[
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';' FieldList(scope, cnt, palign)
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]*
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;
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FieldList(t_scope *scope; arith *cnt; int *palign;)
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{
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t_node *FldList;
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t_type *tp;
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t_node *nd;
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register t_def *df;
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arith tcnt, max;
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} :
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[
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IdentList(&FldList) ':' type(&tp)
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{
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*palign = lcm(*palign, tp->tp_align);
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EnterFieldList(FldList, tp, scope, cnt);
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}
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CASE
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/* Also accept old fashioned Modula-2 syntax, but give a warning.
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Sorry for the complicated code.
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*/
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[ qualident(&nd)
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[ ':' qualtype(&tp)
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/* This is correct, in both kinds of Modula-2, if
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the first qualident is a single identifier.
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*/
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{ if (nd->nd_class != Name) {
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error("illegal variant tag");
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}
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else {
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df = define(nd->nd_IDF, scope, D_FIELD);
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*palign = lcm(*palign, tp->tp_align);
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if (!(tp->tp_fund & T_DISCRETE)) {
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error("illegal type in variant");
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}
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df->df_type = tp;
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df->fld_off = align(*cnt, tp->tp_align);
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*cnt = df->fld_off + tp->tp_size;
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df->df_flags |= D_QEXPORTED;
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}
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FreeNode(nd);
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}
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| /* Old fashioned! the first qualident now represents
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the type
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*/
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{
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#ifndef STRICT_3RD_ED
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if (! options['3']) warning(W_OLDFASHIONED,
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"old fashioned Modula-2 syntax; ':' missing");
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else
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#endif
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error("':' missing");
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tp = qualified_type(nd);
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}
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]
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| ':' qualtype(&tp)
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/* Aha, third edition. Well done! */
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]
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{ tcnt = *cnt; }
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OF variant(scope, &tcnt, tp, palign)
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{ max = tcnt; tcnt = *cnt; }
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[
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'|' variant(scope, &tcnt, tp, palign)
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{ if (tcnt > max) max = tcnt; tcnt = *cnt; }
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]*
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[ ELSE FieldListSequence(scope, &tcnt, palign)
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{ if (tcnt > max) max = tcnt; }
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]
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END
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{ *cnt = max; }
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]
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;
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variant(t_scope *scope; arith *cnt; t_type *tp; int *palign;)
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{
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t_node *nd;
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} :
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[
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CaseLabelList(&tp, &nd)
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{ /* Ignore the cases for the time being.
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Maybe a checking version will be supplied
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later ???
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*/
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FreeNode(nd);
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}
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':' FieldListSequence(scope, cnt, palign)
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]
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/* Changed rule in new modula-2 */
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;
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CaseLabelList(t_type **ptp; t_node **pnd;):
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CaseLabels(ptp, pnd)
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[
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{ *pnd = dot2node(Link, *pnd, NULLNODE); }
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',' CaseLabels(ptp, &((*pnd)->nd_right))
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{ pnd = &((*pnd)->nd_right); }
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]*
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;
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CaseLabels(t_type **ptp; register t_node **pnd;)
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{
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register t_node *nd;
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}:
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ConstExpression(pnd)
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{
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if (*ptp != 0) {
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ChkCompat(pnd, *ptp, "case label");
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}
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nd = *pnd;
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if (! (nd->nd_type->tp_fund & T_DISCRETE) ||
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nd->nd_type->tp_size > word_size) {
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node_error(nd, "illegal type in case label");
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}
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}
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[
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UPTO { *pnd = nd = dot2node(Link,nd,NULLNODE);
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nd->nd_type = nd->nd_left->nd_type;
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}
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ConstExpression(&(*pnd)->nd_right)
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{ if (!ChkCompat(&((*pnd)->nd_right), nd->nd_type,
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"case label")) {
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nd->nd_type = error_type;
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}
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else if (! chk_bounds(nd->nd_left->nd_INT,
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nd->nd_right->nd_INT,
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BaseType(nd->nd_type)->tp_fund)) {
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node_error(nd,
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"lower bound exceeds upper bound in case label range");
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}
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}
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]
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{
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*ptp = nd->nd_type;
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}
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;
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SetType(t_type **ptp;) :
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SET OF SimpleType(ptp)
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{ *ptp = set_type(*ptp); }
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;
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/* In a pointer type definition, the type pointed at does not
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have to be declared yet, so be careful about identifying
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type-identifiers
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*/
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PointerType(register t_type **ptp;) :
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{ *ptp = construct_type(T_POINTER, NULLTYPE); }
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POINTER TO
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[ %if (type_or_forward(ptp))
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type(&((*ptp)->tp_next))
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IDENT
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]
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;
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qualtype(t_type **ptp;)
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{
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t_node *nd;
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} :
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qualident(&nd)
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{ *ptp = qualified_type(nd); }
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;
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ProcedureType(t_type **ptp;) :
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PROCEDURE
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[
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FormalTypeList(ptp)
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{ *ptp = proc_type((t_type *) 0,
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(t_param *) 0,
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(arith) 0);
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}
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]
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;
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FormalTypeList(t_type **ptp;)
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{
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t_param *pr = 0;
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arith parmaddr = 0;
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} :
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'('
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[
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VarFormalType(&pr, &parmaddr)
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[
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',' VarFormalType(&pr, &parmaddr)
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]*
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]
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')'
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[ ':' qualtype(ptp)
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| { *ptp = 0; }
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]
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{ *ptp = proc_type(*ptp, pr, parmaddr); }
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;
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VarFormalType(t_param **ppr; arith *parmaddr;)
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{
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t_type *tp;
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int isvar;
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} :
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var(&isvar)
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FormalType(&tp)
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{ EnterParamList(ppr,NULLNODE,tp,isvar,parmaddr); }
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;
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var(int *VARp;) :
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[
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VAR { *VARp = D_VARPAR; }
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/* empty */ { *VARp = D_VALPAR; }
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]
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;
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ConstantDeclaration
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{
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t_idf *id;
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t_node *nd;
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register t_def *df;
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}:
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IDENT { id = dot.TOK_IDF; }
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'=' ConstExpression(&nd)
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{ df = define(id,CurrentScope,D_CONST);
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df->con_const = nd->nd_token;
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df->df_type = nd->nd_type;
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FreeNode(nd);
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}
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;
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VariableDeclaration
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{
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t_node *VarList;
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register t_node *nd;
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t_type *tp;
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} :
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IdentAddr(&VarList)
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{ nd = VarList; }
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[ %persistent
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',' IdentAddr(&(nd->nd_right))
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{ nd = nd->nd_right; }
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]*
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':' type(&tp)
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{ EnterVarList(VarList, tp, proclevel > 0); }
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;
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IdentAddr(t_node **pnd;)
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{
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register t_node *nd;
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} :
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IDENT { nd = dot2leaf(Name); }
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[ '['
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ConstExpression(&(nd->nd_left))
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']'
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]
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{ *pnd = nd; }
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;
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