120 lines
2.6 KiB
C
120 lines
2.6 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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* Author: Ceriel J.H. Jacobs
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*/
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/* L O O K U P R O U T I N E S */
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/* $Header$ */
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#include "debug.h"
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#include <em_arith.h>
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#include <em_label.h>
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#include <assert.h>
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#include "LLlex.h"
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#include "def.h"
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#include "idf.h"
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#include "scope.h"
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#include "node.h"
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#include "type.h"
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#include "misc.h"
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extern int pass_1;
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#ifdef DEBUG
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extern char options[];
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#endif
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t_def *
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lookup(id, scope, import, flags)
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register t_idf *id;
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t_scope *scope;
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{
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/* Look up a definition of an identifier in scope "scope".
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Make the "def" list self-organizing.
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Return a pointer to its "def" structure if it exists,
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otherwise return 0.
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*/
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register t_def *df, *df1;
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/* Look in the chain of definitions of this "id" for one with scope
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"scope".
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*/
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for (df = id->id_def, df1 = 0;
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df && df->df_scope != scope;
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df1 = df, df = df->df_next) { /* nothing */ }
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if (! df && import && scopeclosed(scope)) {
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for (df = id->id_def, df1 = 0;
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df && df->df_scope != PervasiveScope;
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df1 = df, df = df->df_next) { /* nothing */ }
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}
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if (df) {
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/* Found it
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*/
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if (df1) {
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/* Put the definition in front
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*/
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df1->df_next = df->df_next;
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df->df_next = id->id_def;
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id->id_def = df;
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}
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df->df_flags |= flags;
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while (df->df_kind & import) {
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assert(df->imp_def != 0);
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df = df->imp_def;
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}
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DO_DEBUG(options['S'], print("lookup %s, %x\n", id->id_text, df->df_kind));
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}
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return df;
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}
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t_def *
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lookfor(id, vis, message, flags)
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register t_node *id;
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register t_scopelist *vis;
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{
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/* Look for an identifier in the visibility range started by "vis".
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If it is not defined create a dummy definition and,
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if message is set, give an error message
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*/
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register t_scopelist *sc;
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t_scopelist *sc1 = 0;
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t_def *df;
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for (sc = vis; sc; sc = nextvisible(sc)) {
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df = lookup(id->nd_IDF, sc->sc_scope, D_IMPORTED, flags);
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if (df) {
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if (message && df->df_kind == D_FORWARD) {
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if (! sc1) sc1 = sc;
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while (sc && sc->sc_scope != df->df_scope) {
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sc = enclosing(sc);
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}
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if (sc) continue;
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break;
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}
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if (pass_1 && message) {
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if (sc1) sc = sc1;
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while (vis->sc_scope->sc_level >
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sc->sc_scope->sc_level ||
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(sc1 &&
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vis->sc_scope->sc_level >=
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sc->sc_scope->sc_level)) {
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define( id->nd_IDF,
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vis->sc_scope,
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D_INUSE)-> imp_def = df;
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vis = enclosing(vis);
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}
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}
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return df;
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}
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}
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if (message) id_not_declared(id);
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return MkDef(id->nd_IDF, vis->sc_scope, D_ERROR);
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}
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