471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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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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/* $Header$ */
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/* P R O T O T Y P E F I D D L I N G */
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#include "lint.h"
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#include "debug.h"
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#include "idfsize.h"
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#include "nparams.h"
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#include "botch_free.h"
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#include <alloc.h>
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#include "Lpars.h"
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#include "level.h"
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#include <flt_arith.h>
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#include "arith.h"
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#include "align.h"
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#include "stack.h"
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#include "idf.h"
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#include "def.h"
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#include "type.h"
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#include "struct.h"
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#include "label.h"
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#include "expr.h"
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#include "declar.h"
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#include "decspecs.h"
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#include "proto.h"
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#include "assert.h"
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extern char options[];
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check_for_void(pl)
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register struct proto *pl;
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{
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register int errcnt = 0;
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if (!pl) return;
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if ((pl->pl_flag & PL_VOID) && !(pl->next)) return;
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while (pl) {
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if (pl->pl_flag & PL_VOID) {
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if (!errcnt && !(pl->pl_flag & PL_ERRGIVEN))
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error("illegal use of void in argument list");
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pl->pl_flag |= PL_ERRGIVEN;
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errcnt++;
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}
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pl = pl->next;
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}
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}
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add_proto(pl, ds, dc, lvl)
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struct proto *pl;
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struct decspecs *ds;
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struct declarator *dc;
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int lvl;
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{
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/* The full typed identifier or abstract type, described
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by the structures decspecs and declarator are turned
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a into parameter type list structure.
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The parameters will be declared at level L_FORMAL2,
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later on it's decided whether they were prototypes
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or actual declarations.
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*/
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register struct idf *idf = dc->dc_idf;
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register struct def *def = idf ? idf->id_def : (struct def *)0;
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register int sc = ds->ds_sc;
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register struct type *type;
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char formal_array = 0;
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ASSERT(ds->ds_type != (struct type *)0);
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pl->pl_flag = PL_FORMAL;
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type = declare_type(ds->ds_type, dc);
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if (type->tp_size < (arith)0 && actual_declaration(sc, type)) {
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extern char *symbol2str();
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if (type->tp_fund != VOID)
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error("unknown %s-type", symbol2str(type->tp_fund));
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else {
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if (idf != (struct idf *)0
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|| ds->ds_sc_given
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|| ds->ds_typequal) {
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error("illegal use of void in argument list");
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pl->pl_flag |= PL_ERRGIVEN;
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}
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/* set PL_VOID anyway */
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pl->pl_flag |= PL_VOID;
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}
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}
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if (ds->ds_sc_given && ds->ds_sc != REGISTER) {
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if (!(pl->pl_flag & PL_ERRGIVEN)) {
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if (ds->ds_sc != AUTO) {
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error("illegal storage class in parameter declaration");
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} else {
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warning("illegal storage class in parameter declaration");
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}
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}
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}
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/* Perform some special conversions for parameters.
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*/
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if (type->tp_fund == FUNCTION) {
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type = construct_type(POINTER, type, 0, (arith) 0, NO_PROTO);
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} else if (type->tp_fund == ARRAY) {
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type = construct_type(POINTER, type->tp_up, 0, (arith) 0, NO_PROTO);
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formal_array = 1;
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}
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/* According to the standard we should ignore the storage
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class of a parameter, unless it's part of a function
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definition.
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However, in the routine declare_protos we don't know decspecs,
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and therefore we can't complain up there. So we build up the
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storage class, and keep quiet until we reach declare_protos.
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*/
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sc = (ds->ds_sc_given && ds->ds_sc != REGISTER) ?
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0 : sc == 0 ? FORMAL : REGISTER;
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if (def && (def->df_level == lvl /* || def->df_level < L_PROTO */ )) {
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/* redeclaration at the same level */
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error("parameter %s redeclared", idf->id_text);
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} else if (idf != (struct idf *)0) {
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/* New definition, redefinition hides earlier one
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*/
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register struct def *newdef = new_def();
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newdef->next = def;
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newdef->df_level = lvl;
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newdef->df_sc = sc;
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newdef->df_type = type;
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newdef->df_formal_array = formal_array;
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newdef->df_file = idf->id_file;
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newdef->df_line = idf->id_line;
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#ifdef LINT
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newdef->df_set = (type->tp_fund == ARRAY);
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/* newdef->df_firstbrace = 0; */
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#endif
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/* We can't put the idf onto the stack, since these kinds
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of declaration may occurs at any level, and the idf
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does not necessarily go at this level. E.g.
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f() {
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...
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{ int func(int a, int b);
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...
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}
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}
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The idf's a and b declared in the prototype declaration
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do not go at any level, they are simply ignored.
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However, in
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f(int a, int b) {
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...
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}
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They should go at level L_FORMAL2. But at this stage
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we don't know whether we have a prototype or function
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definition. So, this process is postponed.
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*/
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idf->id_def = newdef;
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update_ahead(idf);
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}
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pl->pl_idf = idf;
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pl->pl_type = type;
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}
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struct tag *
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gettag(tp, idpp)
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struct type *tp;
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struct idf **idpp;
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{
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struct tag *tg = (struct tag *)0;
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register int fund = tp->tp_fund;
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while (fund == FIELD || fund == POINTER
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|| fund == ARRAY || fund == FUNCTION) {
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tp = tp->tp_up;
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fund = tp->tp_fund;
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}
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*idpp = tp->tp_idf;
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switch(tp->tp_fund) {
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case ENUM: tg = tp->tp_idf->id_enum; break;
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case UNION:
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case STRUCT: tg = tp->tp_idf->id_struct; break;
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}
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return tg;
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}
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declare_protos(dc)
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register struct declarator *dc;
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{
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/* At this points we know that the idf's in protolist are formal
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parameters. So it's time to declare them at level L_FORMAL2.
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*/
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struct stack_level *stl = stack_level_of(L_FORMAL1);
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register struct decl_unary *du;
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register struct type *type;
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register struct proto *pl;
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register struct def *def;
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#ifdef DEBUG
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if (options['t'])
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dumpidftab("start declare_protos", 0);
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#endif DEBUG
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du = dc->dc_decl_unary;
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while (du) {
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if (du->du_fund == FUNCTION) {
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if (du->next != (struct decl_unary *) 0) {
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remove_proto_idfs(du->du_proto);
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du->du_proto = 0;
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} else break;
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}
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du = du->next;
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}
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pl = du ? du->du_proto : NO_PROTO;
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if (pl) {
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#if 0 /* the id_proto member is deleted (???) */
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idf->id_proto = 0;
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#endif /* 0 */
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do {
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struct tag *tg;
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struct idf *idp = 0;
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type = pl->pl_type;
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/* `...' only for type checking */
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if (pl->pl_flag & PL_ELLIPSIS) {
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pl = pl->next;
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continue;
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}
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/* special case: int f(void) { ; } */
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if (type->tp_fund == VOID)
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break;
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if (!pl->pl_idf || !(def = pl->pl_idf->id_def)) {
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error("no parameter identifier supplied");
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pl = pl->next;
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continue;
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}
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def->df_level = L_FORMAL2;
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stack_idf(pl->pl_idf, stl);
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pl = pl->next;
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tg = gettag(type, &idp);
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if (tg && tg->tg_level <= L_PROTO) {
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tg->tg_level = L_FORMAL2;
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stack_idf(idp, stl);
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}
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} while (pl);
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}
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#ifdef DEBUG
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if (options['t'])
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dumpidftab("end declare_protos", 0);
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#endif DEBUG
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}
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update_proto(tp, otp)
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register struct type *tp, *otp;
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{
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/* This routine performs the proto type updates.
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Consider the following code:
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int f(double g());
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int f(double g(int f(), int));
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int f(double g(int f(long double), int));
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The most accurate definition is the third line.
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This routine will silently update all lists,
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and removes the redundant occupied space.
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*/
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register struct proto *pl, *opl;
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if (tp == otp) return;
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if (!tp || !otp) return;
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while (tp->tp_fund != FUNCTION) {
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if (tp->tp_fund != POINTER && tp->tp_fund != ARRAY) return;
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tp = tp->tp_up;
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otp = otp->tp_up;
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if (!tp) return;
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}
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pl = tp->tp_proto;
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opl = otp->tp_proto;
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if (pl && opl) {
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/* both have prototypes */
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while (pl && opl) {
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update_proto(pl->pl_type, opl->pl_type);
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pl = pl->next;
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opl = opl->next;
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}
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/* Do not free the old prototype list. It might be part of
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* a typedef.
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*/
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otp->tp_proto = tp->tp_proto;
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} else if (opl) {
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/* old decl has type */
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} else if (pl) {
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otp->tp_proto = pl;
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}
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update_proto(tp->tp_up, otp->tp_up);
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}
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/* struct/union and enum tags can be declared inside prototypes
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* remove them from the symbol-table
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*/
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remove_proto_tag(tp)
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struct type *tp;
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{
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register struct idf *ident;
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register struct tag *tgp, **tgpp;
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register int fund = tp->tp_fund;
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while (fund == FIELD || fund == POINTER
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|| fund == ARRAY || fund == FUNCTION) {
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tp = tp->tp_up;
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fund = tp->tp_fund;
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}
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ident = tp->tp_idf;
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switch (tp->tp_fund) {
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case ENUM: tgpp = &(ident->id_enum); break;
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case STRUCT:
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case UNION: tgpp = &(ident->id_struct); break;
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default: return;
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}
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while((*tgpp) && (*tgpp)->tg_type != tp) {
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tgpp = &((*tgpp)->next);
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}
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if (!*tgpp) return;
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tgp = *tgpp;
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if (tgp->tg_level > L_PROTO) return;
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#ifdef DEBUG
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if (options['t'])
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print("Removing idf %s from list\n",
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ident->id_text);
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#endif
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(*tgpp) = tgp->next;
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free_tag(tgp);
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}
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remove_proto_idfs(pl)
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register struct proto *pl;
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{
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/* Remove all the identifier definitions from the
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prototype list.
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*/
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register struct def *def;
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while (pl) {
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if (pl->pl_idf) {
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#ifdef DEBUG
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if (options['t'])
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print("Removing idf %s from list\n",
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pl->pl_idf->id_text);
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#endif
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def = pl->pl_idf->id_def;
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if (def && def->df_level <= L_PROTO) {
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pl->pl_idf->id_def = def->next;
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free_def(def);
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}
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pl->pl_idf = (struct idf *) 0;
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}
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if (pl->pl_type) {
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remove_proto_tag(pl->pl_type);
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}
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pl = pl->next;
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}
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}
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call_proto(expp)
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register struct expr **expp;
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{
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/* If the function specified by (*expp)->OP_LEFT has a prototype,
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the parameters are converted according the rules specified in
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par. 3.3.2.2. E.i. the parameters are converted to the prototype
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counter parts as if by assignment. For the parameters falling
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under ellipsis clause the old parameters conversion stuff
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applies.
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*/
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register struct expr *left = (*expp)->OP_LEFT;
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register struct expr *right = (*expp)->OP_RIGHT;
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register struct proto *pl = NO_PROTO;
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static struct proto ellipsis = { 0, 0, 0, PL_ELLIPSIS };
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if (left != NILEXPR) { /* in case of an error */
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register struct type *tp = left->ex_type;
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while (tp && tp->tp_fund != FUNCTION)
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tp = tp->tp_up;
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if (tp && tp->tp_proto)
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pl = tp->tp_proto;
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}
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if (right != NILEXPR) { /* function call with parameters */
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register struct expr **ep = &((*expp)->OP_RIGHT);
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register int ecnt = 0, pcnt = 0;
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struct expr **estack[NPARAMS];
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struct proto *pstack[NPARAMS];
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/* stack up the parameter expressions */
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while (right->ex_class == Oper && right->OP_OPER == PARCOMMA) {
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if (ecnt == STDC_NPARAMS)
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expr_strict(right, "number of parameters exceeds ANSI limit");
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if (ecnt >= NPARAMS-1) {
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expr_error(right, "too many parameters");
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return;
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}
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estack[ecnt++] = &(right->OP_RIGHT);
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ep = &(right->OP_LEFT);
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right = right->OP_LEFT;
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}
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estack[ecnt] = ep;
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/* Declarations like int f(void) do not expect any
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parameters.
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*/
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if (pl && pl->pl_flag & PL_VOID) {
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expr_strict(*expp, "no parameters expected");
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pl = NO_PROTO;
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}
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/* stack up the prototypes */
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if (pl) {
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pcnt--;
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do {
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/* stack prototypes */
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pstack[++pcnt] = pl;
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pl = pl->next;
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} while (pl);
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}
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else {
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pstack[0] = &ellipsis;
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}
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for (ecnt; ecnt >= 0; ecnt--) {
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/* Only the parameters specified in the prototype
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are checked and converted. The parameters that
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fall under the ellipsis clause are neither
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checked nor converted !
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*/
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if (pcnt < 0) {
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expr_error(*expp, "more parameters than specified in prototype");
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break;
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}
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else if (!(pstack[pcnt]->pl_flag & PL_ELLIPSIS)) {
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ch3cast(estack[ecnt],CASTAB,pstack[pcnt]->pl_type);
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pcnt--;
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} else
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any2parameter(estack[ecnt]);
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}
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if (pcnt >= 0 && !(pstack[0]->pl_flag & PL_ELLIPSIS))
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expr_error(*expp, "fewer parameters than specified in prototype");
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} else {
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if (pl && !(pl->pl_flag & PL_VOID))
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expr_error(*expp, "fewer parameters than specified in prototype");
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}
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}
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