60 lines
1.4 KiB
C
60 lines
1.4 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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/* L A B E L H A N D L I N G */
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#include "Lpars.h"
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#include "level.h"
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#include "idf.h"
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#include "label.h"
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#include "arith.h"
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#include "def.h"
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#include "type.h"
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extern char options[];
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enter_label(idf, defining)
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register struct idf *idf;
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{
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/* The identifier idf is entered as a label. If it is new,
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it is entered into the idf list with the largest possible
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scope, i.e., on the lowest possible level.
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If defining, the label comes from a label statement.
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*/
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register struct def *def = idf->id_def;
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if (def) {
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if (def->df_sc == LABEL) {
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if (defining && def->df_initialized)
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error("redeclaration of label %s",
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idf->id_text);
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}
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else { /* there may still be room for it */
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if (def->df_level == level) /* but alas, no */
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error("%s is not a label", idf->id_text);
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else {
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add_def(idf, LABEL, label_type, L_LOCAL);
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}
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}
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}
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else {
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add_def(idf, LABEL, label_type, L_LOCAL);
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def = idf->id_def;
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}
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if (def->df_address == 0)
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def->df_address = (arith) text_label();
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if (defining)
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def->df_initialized = 1;
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}
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unstack_label(idf)
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register struct idf *idf;
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{
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/* The scope in which the label idf occurred is left.
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*/
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if (!idf->id_def->df_initialized && !is_anon_idf(idf))
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error("label %s not defined", idf->id_text);
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}
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