581 lines
11 KiB
Plaintext
581 lines
11 KiB
Plaintext
/* D E C L A R A T I O N S */
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{
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#ifndef NORCSID
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static char *RcsId = "$Header$";
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#endif
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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 "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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int proclevel = 0; /* nesting level of procedures */
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int return_occurred; /* set if a return occurred in a
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procedure or function
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*/
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}
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ProcedureDeclaration
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{
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register struct def *df;
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struct def *df1;
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} :
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{ proclevel++; }
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ProcedureHeading(&df1, D_PROCEDURE)
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{
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CurrentScope->sc_definedby = df = df1;
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df->prc_vis = CurrVis;
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return_occurred = 0;
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}
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';' block(&(df->prc_body)) IDENT
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{
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match_id(dot.TOK_IDF, df->df_idf);
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close_scope(SC_CHKFORW|SC_REVERSE);
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if (! return_occurred && ResultType(df->df_type)) {
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error("function procedure does not return a value", df->df_idf->id_text);
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}
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proclevel--;
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}
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;
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ProcedureHeading(struct def **pdf; int type;)
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{
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struct paramlist *params = 0;
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struct type *tp = 0;
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register struct def *df;
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struct def *DeclProc();
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arith NBytesParams;
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} :
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PROCEDURE IDENT
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{
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df = DeclProc(type);
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if (proclevel > 1) {
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/* Room for static link
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*/
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NBytesParams = pointer_size;
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}
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else NBytesParams = 0;
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}
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FormalParameters(¶ms, &tp, &NBytesParams)?
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{
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tp = construct_type(T_PROCEDURE, tp);
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tp->prc_params = params;
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tp->prc_nbpar = NBytesParams;
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if (df->df_type) {
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/* We already saw a definition of this type
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in the definition module.
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*/
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if (!TstProcEquiv(tp, df->df_type)) {
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error("inconsistent procedure declaration for \"%s\"", df->df_idf->id_text);
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}
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FreeType(df->df_type);
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}
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df->df_type = tp;
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*pdf = df;
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if (type == D_PROCHEAD) close_scope(0);
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}
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;
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block(struct node **pnd;) :
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declaration*
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[
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BEGIN
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StatementSequence(pnd)
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{ *pnd = 0; }
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]
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END
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;
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declaration:
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CONST [ ConstantDeclaration ';' ]*
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TYPE [ TypeDeclaration ';' ]*
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VAR [ VariableDeclaration ';' ]*
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ProcedureDeclaration ';'
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ModuleDeclaration ';'
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;
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FormalParameters(struct paramlist **pr;
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struct type **tp;
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arith *parmaddr;)
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{
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struct def *df;
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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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[ ':' qualident(D_ISTYPE, &df, "type", (struct node **) 0)
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{ *tp = df->df_type;
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}
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]?
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;
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FPSection(struct paramlist **ppr; arith *parmaddr;)
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{
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struct node *FPList;
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struct type *tp;
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int VARp = D_VALPAR;
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struct paramlist *p = 0;
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} :
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[
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VAR { VARp = D_VARPAR; }
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]?
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IdentList(&FPList) ':' FormalType(&p, 0)
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{ EnterParamList(ppr, FPList, p->par_def->df_type,
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VARp, parmaddr);
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free_def(p->par_def);
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free_paramlist(p);
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}
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;
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FormalType(struct paramlist **ppr; int VARp;)
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{
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struct def *df1;
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register struct def *df;
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int ARRAYflag;
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register struct type *tp;
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register struct paramlist *p = new_paramlist();
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extern arith ArrayElSize();
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} :
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[ ARRAY OF { ARRAYflag = 1; }
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| { ARRAYflag = 0; }
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]
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qualident(D_ISTYPE, &df1, "type", (struct node **) 0)
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{ df = df1;
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if (ARRAYflag) {
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tp = construct_type(T_ARRAY, NULLTYPE);
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tp->arr_elem = df->df_type;
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tp->arr_elsize = ArrayElSize(df->df_type);
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tp->tp_align = lcm(word_align, pointer_align);
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}
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else tp = df->df_type;
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p->next = *ppr;
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*ppr = p;
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p->par_def = df = new_def();
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df->df_type = tp;
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df->df_flags = VARp;
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}
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;
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TypeDeclaration
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{
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register struct def *df;
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struct type *tp;
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}:
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IDENT { df = lookup(dot.TOK_IDF, CurrentScope);
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if (!df) df = define(dot.TOK_IDF,CurrentScope,D_TYPE);
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}
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'=' type(&tp)
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{
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if (df->df_kind == D_HIDDEN) {
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if (tp->tp_fund != T_POINTER) {
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error("opaque type \"%s\" is not a pointer type", df->df_idf->id_text);
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}
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df->df_kind = D_TYPE;
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*(df->df_type) = *tp;
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free_type(tp);
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}
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else {
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df->df_type = tp;
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df->df_kind = D_TYPE;
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}
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}
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;
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type(struct type **ptp;):
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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(struct type **ptp;)
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{
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struct def *df;
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} :
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qualident(D_ISTYPE, &df, "type", (struct node **) 0)
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[
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/* nothing */
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{ *ptp = df->df_type; }
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SubrangeType(ptp)
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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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{
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chk_basesubrange(*ptp, df->df_type);
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}
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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(struct type **ptp;)
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{
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struct node *EnumList;
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register struct type *tp;
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} :
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'(' IdentList(&EnumList) ')'
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{
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*ptp = tp = standard_type(T_ENUMERATION, 1, (arith) 1);
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EnterEnumList(EnumList, tp);
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if (tp->enm_ncst > 256) { /* ??? is this reasonable ??? */
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error("Too many enumeration literals");
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}
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}
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;
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IdentList(struct node **p;)
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{
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register struct node *q;
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} :
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IDENT { q = MkLeaf(Value, &dot);
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*p = q;
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}
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[
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',' IDENT
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{ q->next = MkLeaf(Value, &dot);
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q = q->next;
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}
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]*
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{ q->next = 0; }
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;
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SubrangeType(struct type **ptp;)
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{
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struct 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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}
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;
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ArrayType(struct type **ptp;)
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{
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struct type *tp;
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register struct type *tp2;
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} :
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ARRAY SimpleType(&tp)
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{
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*ptp = tp2 = construct_type(T_ARRAY, tp);
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}
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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(struct type **ptp;)
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{
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struct scope *scope;
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arith count;
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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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{ open_scope(OPENSCOPE);
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scope = CurrentScope;
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close_scope(0);
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count = 0;
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}
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FieldListSequence(scope, &count, &xalign)
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{
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*ptp = standard_type(T_RECORD, xalign, WA(count));
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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(struct 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(struct scope *scope; arith *cnt; int *palign;)
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{
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struct node *FldList;
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struct idf *id;
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struct def *df;
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struct type *tp;
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struct node *nd;
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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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{ *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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*/
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[ qualident(0, &df, (char *) 0, &nd)
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[ /* This is good, 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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id = gen_anon_idf();
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}
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else id = nd->nd_IDF;
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}
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':' qualident(D_ISTYPE, &df, "type", (struct node **) 0)
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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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{ warning("Old fashioned Modula-2 syntax!");
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id = gen_anon_idf();
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df = ill_df;
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if (chk_designator(nd) &&
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(nd->nd_class != Def ||
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!(nd->nd_def->df_kind &
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(D_ERROR|D_ISTYPE)))) {
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node_error(nd, "type expected");
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}
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else df = nd->nd_def;
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FreeNode(nd);
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}
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]
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/* Aha, third edition? */
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':' qualident(D_ISTYPE, &df, "type", (struct node **) 0)
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{ id = gen_anon_idf(); }
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]
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{ tp = df->df_type;
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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 = define(id, scope, D_FIELD);
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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 = tcnt = df->fld_off + tp->tp_size;
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df->df_flags |= D_QEXPORTED;
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}
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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(struct scope *scope; arith *cnt; struct type *tp; int *palign;)
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{
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struct type *tp1 = tp;
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struct node *nd;
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} :
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[
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CaseLabelList(&tp1, &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(struct type **ptp; struct node **pnd;):
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CaseLabels(ptp, pnd)
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[
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{ *pnd = MkNode(Link, *pnd, NULLNODE, &dot); }
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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(struct type **ptp; struct node **pnd;)
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{
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struct node *nd1, *nd2 = 0;
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}:
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ConstExpression(&nd1) { *pnd = nd1; }
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[
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UPTO { *pnd = MkNode(Link,nd1,NULLNODE,&dot); }
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ConstExpression(&nd2)
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{ if (!TstCompat(nd1->nd_type, nd2->nd_type)) {
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node_error(nd2,"type incompatibility in case label");
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nd1->nd_type = error_type;
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}
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(*pnd)->nd_right = nd2;
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}
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]?
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{ if (*ptp != 0 &&
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!TstCompat(*ptp, nd1->nd_type)) {
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node_error(nd1,"type incompatibility in case label");
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}
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*ptp = nd1->nd_type;
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}
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;
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SetType(struct type **ptp;)
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{
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struct type *tp;
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} :
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SET OF SimpleType(&tp)
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{
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*ptp = set_type(tp);
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}
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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(struct type **ptp;)
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{
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struct type *tp;
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struct def *df;
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struct node *nd;
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} :
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POINTER TO
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[ %if ( (df = lookup(dot.TOK_IDF, CurrentScope)))
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/* Either a Module or a Type, but in both cases defined
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in this scope, so this is the correct identification
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*/
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qualident(D_ISTYPE, &df, "type", (struct node **) 0)
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{
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if (!df->df_type) {
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error("type \"%s\" not declared",
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df->df_idf->id_text);
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tp = error_type;
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}
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else tp = df->df_type;
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}
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| %if ( nd = new_node(), nd->nd_token = dot,
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df = lookfor(nd, CurrVis, 0), free_node(nd),
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df->df_kind == D_MODULE)
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type(&tp)
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IDENT
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{ tp = NULLTYPE; }
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]
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{
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*ptp = construct_type(T_POINTER, tp);
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if (!tp) Forward(&dot, &((*ptp)->next));
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}
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;
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ProcedureType(struct type **ptp;)
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{
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struct paramlist *pr = 0;
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struct type *tp = 0;
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} :
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PROCEDURE FormalTypeList(&pr, &tp)?
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{ *ptp = construct_type(T_PROCEDURE, tp);
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(*ptp)->prc_params = pr;
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}
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;
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FormalTypeList(struct paramlist **ppr; struct type **ptp;)
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{
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struct def *df;
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int VARp;
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} :
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'(' { *ppr = 0; }
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[
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[ VAR { VARp = D_VARPAR; }
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| { VARp = D_VALPAR; }
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]
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FormalType(ppr, VARp)
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[
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','
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[ VAR {VARp = D_VARPAR; }
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| {VARp = D_VALPAR; }
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]
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FormalType(ppr, VARp)
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]*
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]?
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')'
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[ ':' qualident(D_TYPE, &df, "type", (struct node **) 0)
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{ *ptp = df->df_type; }
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]?
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;
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|
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ConstantDeclaration
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{
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struct def *df;
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struct idf *id;
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struct node *nd;
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}:
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IDENT { id = dot.TOK_IDF; }
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'=' ConstExpression(&nd){ df = define(id, CurrentScope, D_CONST);
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df->con_const = nd;
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}
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;
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|
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VariableDeclaration
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{
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struct node *VarList;
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register struct node *nd;
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struct type *tp;
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} :
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IdentAddr(&VarList)
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{ nd = VarList; }
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[
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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)
|
|
{ EnterVarList(VarList, tp, proclevel > 0); }
|
|
;
|
|
|
|
IdentAddr(struct node **pnd;) :
|
|
IDENT { *pnd = MkLeaf(Name, &dot); }
|
|
ConstExpression(&((*pnd)->nd_left))?
|
|
;
|