623 lines
15 KiB
C
623 lines
15 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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/* IDENTIFIER FIDDLING & SYMBOL TABLE HANDLING */
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#include "lint.h"
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#include <em_reg.h>
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#include "debug.h"
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#include "idfsize.h"
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#include "botch_free.h"
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#include "nopp.h"
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#include "nparams.h"
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#include <alloc.h>
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#include "arith.h"
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#include "align.h"
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#include "LLlex.h"
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#include "level.h"
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#include "stack.h"
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#include "idf.h"
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#include "label.h"
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#include "def.h"
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#include "type.h"
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#include "proto.h"
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#include "struct.h"
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#include "declar.h"
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#include "decspecs.h"
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#include "sizes.h"
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#include "Lpars.h"
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#include "assert.h"
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extern char options[];
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extern arith NewLocal();
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extern char *symbol2str();
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#ifdef DEBUG
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#define IDF_DEBUG
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#endif
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#include <idf_pkg.body>
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struct idf *
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gen_idf()
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{
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/* A new idf is created out of nowhere, to serve as an
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anonymous name.
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*/
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static int name_cnt;
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char buff[100];
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sprint(buff, "#%d in %s, line %u",
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++name_cnt, dot.tk_file, dot.tk_line);
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return str2idf(buff, 1);
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}
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int
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is_anon_idf(idf)
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struct idf *idf;
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{
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return idf->id_text[0] == '#';
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}
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declare_idf(ds, dc, lvl)
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struct decspecs *ds;
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struct declarator *dc;
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{
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/* The identifier inside dc is declared on the level lvl, with
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properties deduced from the decspecs ds and the declarator
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dc.
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The level is given explicitly to be able to insert, e.g.,
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labels on the outermost level inside the function.
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This routine implements the rich semantics of C
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declarations.
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*/
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register struct idf *idf = dc->dc_idf;
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register int sc = ds->ds_sc;
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/* This local copy is essential:
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char b(), c;
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makes b GLOBAL and c AUTO.
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*/
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register struct def *def = idf->id_def; /* may be NULL */
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register struct type *type;
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struct stack_level *stl = stack_level_of(lvl);
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char formal_array = 0;
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/* determine the present type */
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if (ds->ds_type == 0) {
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/* at the L_FORMAL1 level there is no type specified yet
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*/
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ASSERT(lvl == L_FORMAL1);
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type = int_type; /* may change at L_FORMAL2 */
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}
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else {
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/* combine the decspecs and the declarator into one type */
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type = declare_type(ds->ds_type, dc);
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if (type->tp_size <= (arith)0 &&
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actual_declaration(sc, type)) {
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if (type->tp_size == (arith) -1) {
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/* the type is not yet known,
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but it has to be:
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*/
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if (type->tp_fund != VOID) {
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if (level != L_GLOBAL)
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error("unknown %s-type",
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symbol2str(type->tp_fund));
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} else error("void is not a complete type");
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}
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else strict("%s has size 0", idf->id_text);
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}
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}
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/* some additional work for formal definitions */
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if (lvl == L_FORMAL2) {
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switch (type->tp_fund) {
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case FUNCTION:
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warning("%s is a function; cannot be formal",
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idf->id_text);
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type = construct_type(POINTER, type, 0, (arith)0,
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NO_PROTO);
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break;
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case ARRAY: /* 3.7.1 */
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type = construct_type(POINTER, type->tp_up, 0, (arith)0,
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NO_PROTO);
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formal_array = 1;
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break;
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case FLOAT:
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case CHAR:
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case SHORT:
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/* The conversion is done in formal_cvt(). It is
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* not done when the type is float and there is a
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* prototype.
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*/
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break;
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}
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}
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/* The tests on types, postponed from do_decspecs(), can now
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be performed.
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*/
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/* update the storage class */
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if (type && type->tp_fund == FUNCTION) {
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if (lvl != L_GLOBAL) { /* 3.5.1 */
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if (sc == 0)
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sc = GLOBAL;
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else if (sc != EXTERN && sc != TYPEDEF) {
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error("illegal storage class %s for function with block-scope"
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, symbol2str(sc));
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ds->ds_sc = sc = EXTERN;
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}
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}
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else if (sc == 0)
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sc = GLOBAL;
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}
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else /* non-FUNCTION */
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if (sc == 0)
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sc = lvl == L_GLOBAL ? GLOBAL
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: lvl == L_FORMAL1 || lvl == L_FORMAL2 ? FORMAL
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: AUTO;
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#ifdef LINT
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check_hiding(idf, lvl, sc); /* of some idf by this idf */
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#endif /* LINT */
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if (def && lvl == L_LOCAL && def->df_level == L_FORMAL2) {
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error("%s redeclared", idf->id_text);
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}
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if (def &&
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( def->df_level == lvl ||
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( lvl != L_GLOBAL && def->df_level > lvl ) ||
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(lvl == L_GLOBAL
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&& def->df_level == L_PROTO
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&& def->next && def->next->df_level == L_GLOBAL)
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)) {
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/* There is already a declaration for idf on this
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level, or even more inside.
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The rules differ for different levels.
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*/
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switch (lvl) {
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case L_GLOBAL:
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global_redecl(idf, sc, type);
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def->df_file = idf->id_file;
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def->df_line = idf->id_line;
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break;
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case L_FORMAL1: /* formal declaration */
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error("formal %s redeclared", idf->id_text);
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break;
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case L_FORMAL2: /* formal definition */
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default: /* local */
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if (sc != EXTERN) error("%s redeclared", idf->id_text);
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break;
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}
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}
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else /* the idf is unknown on this level */
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if (lvl == L_FORMAL2 && sc != ENUM && good_formal(def, idf)) {
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/* formal declaration, update only */
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def->df_type = type;
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def->df_formal_array = formal_array;
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def->df_sc = sc;
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def->df_level = L_FORMAL2; /* CJ */
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def->df_file = idf->id_file;
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def->df_line = idf->id_line;
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}
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else { /* fill in the def block */
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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_type = type;
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newdef->df_sc = sc;
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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 = 0;
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newdef->df_firstbrace = 0;
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#endif /* LINT */
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/* link it into the name list in the proper place */
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idf->id_def = newdef;
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update_ahead(idf);
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stack_idf(idf, stl);
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/* We now calculate the address.
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Globals have names and don't get addresses, they
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get numbers instead (through data_label()).
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Formals are handled by declare_formals().
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So here we hand out local addresses only.
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*/
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if (lvl >= L_LOCAL) {
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ASSERT(sc);
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switch (sc) {
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case REGISTER:
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case AUTO:
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if (type->tp_size == (arith)-1
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&& type->tp_fund != ARRAY) {
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error("size of local %s unknown",
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idf->id_text);
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/** type = idf->id_def->df_type = int_type; **/
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}
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newdef->df_address =
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NewLocal(type->tp_size,
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type->tp_align,
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regtype(type),
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sc);
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break;
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case STATIC:
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newdef->df_address = (arith) data_label();
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break;
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}
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}
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}
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}
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actual_declaration(sc, tp)
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int sc;
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struct type *tp;
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{
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/* An actual_declaration needs space, right here and now.
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*/
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register int fund = tp->tp_fund;
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if (sc == ENUM || sc == TYPEDEF) /* virtual declarations */
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return 0;
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if (fund == FUNCTION || fund == ARRAY)
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/* allocation solved in other ways */
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return 0;
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/* to be allocated */
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return 1;
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}
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global_redecl(idf, new_sc, tp)
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register struct idf *idf;
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struct type *tp;
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{
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/* A global identifier may be declared several times,
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provided the declarations do not conflict; they might
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conflict in type (or supplement each other in the case of
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an array) or they might conflict or supplement each other
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in storage class.
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*/
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register struct def *def = idf->id_def;
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while (def->df_level != L_GLOBAL) def = def->next;
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if (!equal_type(tp, def->df_type, 0, 1)) {
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error("redeclaration of %s with different type", idf->id_text);
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return;
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} else update_proto(tp, def->df_type);
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if (tp->tp_fund == ARRAY) {
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/* Multiple array declaration; this may be interesting */
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if (tp->tp_size < 0) { /* new decl has [] */
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/* nothing new */
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} else
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if (def->df_type->tp_size < 0) { /* old decl has [] */
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def->df_type = tp;
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}
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} if (tp->tp_fund == FUNCTION && new_sc == GLOBAL) {
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/* see 3.1.2.2 */
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new_sc = EXTERN;
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}
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/* Now we may be able to update the storage class.
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Clean out this mess as soon as we know all the possibilities
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for new_sc.
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For now we have:
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EXTERN: we have seen the word "extern"
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GLOBAL: the item was declared on the outer
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level, without either "extern" or
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"static".
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STATIC: we have seen the word "static"
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*/
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switch (def->df_sc) { /* the old storage class */
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case EXTERN:
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switch (new_sc) { /* the new storage class */
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case STATIC:
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warning("%s redeclared static", idf->id_text);
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/* fallthrough */
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case GLOBAL:
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def->df_sc = new_sc;
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/* fallthrough */
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case EXTERN:
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break;
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default:
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crash("bad storage class");
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/*NOTREACHED*/
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}
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break;
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case GLOBAL:
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switch (new_sc) { /* the new storage class */
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case STATIC: /* linkage disagreement */
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warning("%s redeclared static", idf->id_text);
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def->df_sc = new_sc;
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/* fallthrough */
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case GLOBAL:
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case EXTERN:
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break;
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default:
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crash("bad storage class");
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/*NOTREACHED*/
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}
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break;
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case STATIC:
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switch (new_sc) { /* the new storage class */
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case GLOBAL: /* linkage disagreement */
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case EXTERN:
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warning("%s is already declared static", idf->id_text);
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/* fallthrough */
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case STATIC:
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break;
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default:
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crash("bad storage class");
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/*NOTREACHED*/
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}
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break;
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case ENUM:
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case TYPEDEF:
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error("illegal redeclaration of %s", idf->id_text);
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break;
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default:
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crash("bad storage class");
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/*NOTREACHED*/
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}
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}
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int
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good_formal(def, idf)
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register struct def *def;
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register struct idf *idf;
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{
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/* Succeeds if def is a proper L_FORMAL1 definition and
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gives an error message otherwise.
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*/
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if (!def || def->df_level != L_FORMAL1) { /* not in parameter list */
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if (!is_anon_idf(idf))
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error("%s not in parameter list", idf->id_text);
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return 0;
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}
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ASSERT(def->df_sc == FORMAL); /* CJ */
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return 1;
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}
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declare_params(dc)
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struct declarator *dc;
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{
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/* Declares the formal parameters if they exist.
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*/
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register struct formal *fm = dc->dc_formal;
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while (fm) {
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declare_parameter(fm->fm_idf);
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fm = fm->next;
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}
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}
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idf_initialized(idf)
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register struct idf *idf;
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{
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/* The topmost definition of idf is set to initialized.
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*/
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register struct def *def = idf->id_def; /* the topmost */
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while (def->df_level <= L_PROTO) def = def->next;
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if (def->df_initialized)
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error("multiple initialization of %s", idf->id_text);
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if (def->df_sc == TYPEDEF) {
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error("typedef cannot be initialized");
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return;
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}
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def->df_initialized = 1;
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}
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declare_parameter(idf)
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struct idf *idf;
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{
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/* idf is declared as a formal.
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*/
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add_def(idf, FORMAL, int_type, level);
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}
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declare_enum(tp, idf, l)
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struct type *tp;
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struct idf *idf;
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arith l;
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{
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/* idf is declared as an enum constant with value l.
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*/
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add_def(idf, ENUM, tp, level);
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idf->id_def->df_address = l;
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}
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check_formals(idf, dc)
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struct idf *idf;
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struct declarator *dc;
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{
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register struct formal *fm = dc->dc_formal;
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register struct proto *pl = idf->id_def->df_type->tp_proto;
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register struct decl_unary *du = dc->dc_decl_unary;
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if (!du) { /* error or typdef'ed function */
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error("illegal definition of %s", idf->id_text);
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return;
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}
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while (du
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&& (du->du_fund != FUNCTION
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|| du->next != (struct decl_unary *) 0)) {
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du = du->next;
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}
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if (!du) return; /* terrible error, signalled earlier */
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if (du->du_proto) return;
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if (pl) {
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/* Don't give a warning about an old-style definition,
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* since the arguments will be checked anyway.
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*/
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if (pl->pl_flag & PL_ELLIPSIS) {
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if (!(du->du_proto) && !(pl->pl_flag & PL_ERRGIVEN))
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error("ellipsis terminator in previous declaration");
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pl = pl->next;
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}
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else if (pl->pl_flag & PL_VOID) {
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pl = pl->next; /* should be 0 */
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}
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while(fm && pl) {
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if (!equal_type(promoted_type(fm->fm_idf->id_def->df_type)
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, pl->pl_type, -1, 1)) {
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if (!(pl->pl_flag & PL_ERRGIVEN))
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error("incorrect type for parameter %s"
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, fm->fm_idf->id_text);
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pl->pl_flag |= PL_ERRGIVEN;
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}
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fm = fm->next;
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pl = pl->next;
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}
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if (pl || fm) {
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error("incorrect number of parameters");
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}
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} else { /* make a pseudo-prototype */
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register struct proto *lpl = new_proto();
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|
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if (!options['o'])
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warning("'%s' old-fashioned function definition"
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, dc->dc_idf->id_text);
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|
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while (fm) {
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if (pl == 0) pl = lpl;
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else {
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lpl->next = new_proto();
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lpl = lpl->next;
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}
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lpl->pl_flag = PL_FORMAL;
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lpl->pl_idf = fm->fm_idf;
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lpl->pl_type =
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promoted_type(fm->fm_idf->id_def->df_type);
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fm = fm->next;
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}
|
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if (pl == 0) { /* make func(void) */
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pl = lpl;
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pl->pl_type = void_type;
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pl->pl_flag = PL_FORMAL | PL_VOID;
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}
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idf->id_def->df_type->tp_pseudoproto = pl;
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}
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free_formals(dc->dc_formal);
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dc->dc_formal = 0;
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}
|
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|
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declare_formals(idf, fp)
|
|
struct idf *idf;
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arith *fp;
|
|
{
|
|
/* Declares those formals as int that haven't been declared
|
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by the user.
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|
An address is assigned to each formal parameter.
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|
The total size of the formals is returned in *fp;
|
|
*/
|
|
register struct stack_entry *se = stack_level_of(L_FORMAL1)->sl_entry;
|
|
arith f_offset = (arith)0;
|
|
register int nparams = 0;
|
|
int hasproto = idf->id_def->df_type->tp_proto != 0;
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|
|
#ifdef DEBUG
|
|
if (options['t'])
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|
dumpidftab("start declare_formals", 0);
|
|
#endif /* DEBUG */
|
|
while (se) {
|
|
register struct def *def = se->se_idf->id_def;
|
|
|
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/* this stacklevel may also contain tags. ignore them */
|
|
if (!def || def->df_level < L_FORMAL1 ) {
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se = se->next;
|
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continue;
|
|
}
|
|
|
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def->df_address = f_offset;
|
|
/* the alignment convention for parameters is: align on
|
|
word boundaries, i.e. take care that the following
|
|
parameter starts on a new word boundary.
|
|
*/
|
|
f_offset = align(f_offset + def->df_type->tp_size, (int) word_size);
|
|
RegisterAccount(def->df_address, def->df_type->tp_size,
|
|
regtype(def->df_type),
|
|
def->df_sc);
|
|
/* cvt int to char or short and double to float, if necessary
|
|
*/
|
|
formal_cvt(hasproto, def);
|
|
|
|
def->df_level = L_FORMAL2; /* CJ */
|
|
if (nparams++ >= STDC_NPARAMS)
|
|
strict("number of formal parameters exceeds ANSI limit");
|
|
#ifdef DBSYMTAB
|
|
if (options['g']) {
|
|
stb_string(def, FORMAL, se->se_idf->id_text);
|
|
}
|
|
#endif /* DBSYMTAB */
|
|
se = se->next;
|
|
}
|
|
*fp = f_offset;
|
|
}
|
|
|
|
int
|
|
regtype(tp)
|
|
struct type *tp;
|
|
{
|
|
switch(tp->tp_fund) {
|
|
case INT:
|
|
case LONG:
|
|
return reg_any;
|
|
case FLOAT:
|
|
case DOUBLE:
|
|
case LNGDBL:
|
|
return reg_float;
|
|
case POINTER:
|
|
return reg_pointer;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
add_def(idf, sc, tp, lvl)
|
|
struct idf *idf;
|
|
struct type *tp;
|
|
int lvl;
|
|
int sc;
|
|
{
|
|
/* The identifier idf is declared on level lvl with storage
|
|
class sc and type tp, through a faked C declaration.
|
|
This is probably the wrong way to structure the problem,
|
|
but it will have to do for the time being.
|
|
*/
|
|
struct decspecs Ds; struct declarator Dc;
|
|
|
|
Ds = null_decspecs;
|
|
Ds.ds_type = tp;
|
|
Ds.ds_sc = sc;
|
|
Dc = null_declarator;
|
|
Dc.dc_idf = idf;
|
|
declare_idf(&Ds, &Dc, lvl);
|
|
}
|
|
|
|
update_ahead(idf)
|
|
register struct idf *idf;
|
|
{
|
|
/* The tk_symb of the token ahead is updated in the light of new
|
|
information about the identifier idf.
|
|
*/
|
|
register int tk_symb = AHEAD;
|
|
|
|
if ( (tk_symb == IDENTIFIER || tk_symb == TYPE_IDENTIFIER) &&
|
|
ahead.tk_idf == idf
|
|
)
|
|
AHEAD = idf->id_def && idf->id_def->df_sc == TYPEDEF ?
|
|
TYPE_IDENTIFIER : IDENTIFIER;
|
|
}
|
|
|
|
free_formals(fm)
|
|
register struct formal *fm;
|
|
{
|
|
while (fm) {
|
|
struct formal *tmp = fm->next;
|
|
|
|
free_formal(fm);
|
|
fm = tmp;
|
|
}
|
|
}
|