358 lines
6.5 KiB
C
358 lines
6.5 KiB
C
/* $Header$ */
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/* Symbol handling */
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#include <stdio.h>
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#include <alloc.h>
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#include <out.h>
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#include <stb.h>
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#include <assert.h>
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#include "position.h"
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#include "file.h"
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#include "idf.h"
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#include "type.h"
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#include "symbol.h"
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#include "scope.h"
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#include "tree.h"
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#include "operator.h"
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#include "misc.h"
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p_symbol currfile, listfile;
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extern FILE *db_out;
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p_symbol
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NewSymbol(s, scope, class, nam)
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char *s;
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register p_scope scope;
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struct outname *nam;
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{
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register p_symbol sym;
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sym = new_symbol();
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sym->sy_idf = str2idf(s, 0);
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sym->sy_scope = scope;
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sym->sy_prev_sc = scope->sc_symbs;
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scope->sc_symbs = sym;
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sym->sy_next = sym->sy_idf->id_def;
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sym->sy_idf->id_def = sym;
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sym->sy_class = class;
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switch(class) {
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case MODULE:
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case PROC:
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case FUNCTION:
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case VAR:
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case REGVAR:
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case LOCVAR:
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case VARPAR:
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sym->sy_name.nm_value = nam->on_valu;
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break;
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default:
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break;
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}
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return sym;
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}
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/* Lookup a definition for 'id' in scope 'scope' with class in the 'class'
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bitset.
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*/
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p_symbol
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Lookup(id, scope, class)
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struct idf *id;
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p_scope scope;
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int class;
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{
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register p_symbol p = id ? id->id_def : 0;
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while (p) {
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if (p->sy_scope == scope && (p->sy_class & class)) {
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return p;
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}
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p = p->sy_next;
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}
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return (p_symbol) 0;
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}
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/* Lookup a definition for 'id' with class in the 'class' bitset,
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starting in scope 'sc' and also looking in enclosing scopes.
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*/
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p_symbol
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Lookfromscope(id, class, sc)
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register struct idf *id;
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int class;
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register p_scope sc;
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{
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if (! id) return (p_symbol) 0;
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while (sc) {
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register p_symbol sym = id->id_def;
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while (sym) {
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if (sym->sy_scope == sc && (sym->sy_class & class)) {
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return sym;
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}
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sym = sym->sy_next;
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}
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sc = sc->sc_static_encl;
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}
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return (p_symbol) 0;
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}
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extern char *strrindex();
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p_symbol
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add_file(s)
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char *s;
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{
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register p_symbol sym = NewSymbol(s,
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PervasiveScope,
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FILESYM,
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(struct outname *) 0);
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register char *p;
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sym->sy_file = new_file();
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sym->sy_file->f_sym = sym;
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p = strrindex(s, '.');
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if (p) {
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char c = *p;
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p_symbol sym1;
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*p = 0;
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s = Salloc(s, (unsigned) strlen(s)+1);
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*p = c;
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sym1 = NewSymbol(s,
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PervasiveScope,
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FILELINK,
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(struct outname *) 0);
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sym1->sy_filelink = sym;
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sym->sy_file->f_base = sym1;
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}
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return sym;
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}
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static p_scope
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def_scope(s)
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p_symbol s;
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{
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switch(s->sy_class) {
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case FILELINK:
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s = s->sy_filelink;
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/* fall through */
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case FILESYM:
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return s->sy_file->f_scope;
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case PROC:
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case FUNCTION:
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case MODULE:
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case TYPE:
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case VAR:
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case REGVAR:
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case LOCVAR:
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case VARPAR:
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return s->sy_name.nm_scope;
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}
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return 0;
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}
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/* Determine if the OP_SELECT tree indicated by 'p' could lead to scope 'sc'.
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*/
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int
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consistent(p, sc)
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p_tree p;
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p_scope sc;
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{
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p_tree arg;
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p_symbol sym;
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p_scope target_sc;
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assert(p->t_oper == OP_SELECT);
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p = p->t_args[0];
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switch(p->t_oper) {
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case OP_NAME:
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#define CLASS (FILELINK|FILESYM|PROC|FUNCTION|MODULE|TYPE|VAR|REGVAR|LOCVAR|VARPAR|LBOUND|UBOUND)
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sym = Lookfromscope(p->t_idf, CLASS, sc->sc_static_encl);
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if (sym) {
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int precise = 1;
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target_sc = def_scope(sym);
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while (sc && sc != target_sc) {
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precise = 0;
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sc = sc->sc_static_encl;
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}
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return sc == 0 ? 0 : precise + 1 ;
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}
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return 0;
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case OP_SELECT:
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arg = p->t_args[1];
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sym = Lookfromscope(arg->t_idf, CLASS, sc->sc_static_encl);
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if (sym) {
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int precise = 1;
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target_sc = def_scope(sym);
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while (sc && sc != target_sc) {
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precise = 0;
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sc = sc->sc_static_encl;
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}
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if (sc == 0) return 0;
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if (precise) return consistent(p, sym->sy_scope);
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return consistent(p, sym->sy_scope) != 0;
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}
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return 0;
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default:
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assert(0);
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}
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return 0; /* notreached? */
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}
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/* Try to find the name referred to in the node indicated by 'p', and
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try to be just a little bit intelligent about it.
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*/
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p_symbol
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identify(p, class_set)
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p_tree p;
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int class_set;
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{
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p_symbol sym = 0, sym1 = 0;
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register p_symbol s;
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p_tree arg;
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int precise = 0;
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switch(p->t_oper) {
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case OP_NAME:
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sym = Lookfromscope(p->t_idf, class_set, CurrentScope);
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if (sym) {
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/* Found it. */
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break;
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}
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/* We could not find it using the current scope; now we try to identify
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it using class_set. If this results in only one definition, we
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take this one.
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*/
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s = p->t_idf->id_def;
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while (s) {
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if (s->sy_class & class_set) {
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if (sym) {
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error("could not identify \"%s\"", p->t_str);
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sym = 0;
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break;
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}
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sym = s;
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}
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s = s->sy_next;
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}
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if (!sym && !s) {
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error("could not find \"%s\"", p->t_str);
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}
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break;
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case OP_SELECT:
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arg = p->t_args[1];
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assert(arg->t_oper == OP_NAME);
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s = arg->t_idf->id_def;
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while (s) {
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int temp;
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if ((s->sy_class & class_set) &&
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(temp = consistent(p, s->sy_scope))) {
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if (temp > precise) {
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sym = s;
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precise = temp;
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sym1 = 0;
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}
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else if (sym && temp == precise) sym1 = s;
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}
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s = s->sy_next;
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}
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if (sym && sym1) {
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error("could not identify \"%s\"", arg->t_str);
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return 0;
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}
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if (!sym && !s) {
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error("could not find \"%s\"", arg->t_str);
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return 0;
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}
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break;
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default:
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assert(0);
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}
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return sym;
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}
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static
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pr_scopes(sc)
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p_scope sc;
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{
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if (! sc) return;
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pr_scopes(sc->sc_static_encl);
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if (sc->sc_definedby) {
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if (sc->sc_definedby->sy_class == FILESYM &&
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sc->sc_definedby->sy_file->f_base) {
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fprintf(db_out, "%s`", sc->sc_definedby->sy_file->f_base->sy_idf->id_text);
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}
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else fprintf(db_out, "%s`", sc->sc_definedby->sy_idf->id_text);
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}
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}
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pr_sym(s)
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p_symbol s;
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{
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switch(s->sy_class) {
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case CONST:
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fprintf(db_out, "Constant:\t");
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break;
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case TYPE:
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fprintf(db_out, "Type:\t\t");
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break;
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case TAG:
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fprintf(db_out, "Tag:\t\t");
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break;
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case MODULE:
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fprintf(db_out, "Module:\t\t");
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break;
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case PROC:
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case FUNCTION:
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fprintf(db_out, "Routine:\t");
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break;
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case VAR:
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case REGVAR:
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case LOCVAR:
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case VARPAR:
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case LBOUND:
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case UBOUND:
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fprintf(db_out, "Variable:\t");
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break;
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case FIELD:
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fprintf(db_out, "Field:\t\t");
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break;
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case FILESYM:
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case FILELINK:
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fprintf(db_out, "File:\t\t");
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break;
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default:
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assert(0);
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}
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pr_scopes(s->sy_scope);
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fprintf(db_out, "%s\n", s->sy_idf->id_text);
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}
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resolve_cross(tp)
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p_type tp;
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{
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register p_symbol sym = tp->ty_sym->sy_idf->id_def;
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while (sym) {
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if (sym->sy_class == TAG &&
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sym->sy_type->ty_class == T_CROSS &&
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sym->sy_type->ty_cross == (p_type) 0 &&
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sym->sy_type->ty_size == tp->ty_class &&
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scope_encloses(tp->ty_sym->sy_scope, sym->sy_scope)) {
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sym->sy_type->ty_cross = tp;
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sym->sy_type->ty_size = tp->ty_size;
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}
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sym = sym->sy_next;
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}
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}
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