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label.c

/* $Id: label.c,v 1.4 2009-01-27 15:40:22 potyra Exp $ 
 *
 * Copyright (C) 2008-2009 FAUcc Team <info@faumachine.org>.
 * This program is free software. You can redistribute it and/or modify it
 * under the terms of the GNU General Public License, either version 2 of
 * the License, or (at your option) any later version. See COPYING.
 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "label.h"
#include "stmt.h"

struct label *
label_new(const char *identifier)
{
      struct label *label;

      label = malloc(sizeof *label);
      assert(label);

      memset(label, 0, sizeof *label);

      label->identifier = identifier;

      return label;
}

static void
label_free(struct label *label)
{
      if (! label->ref_first
       && ! label->def_first) {
#if 0
            free(label);
#endif
      }
}

void
label_ref_add(struct label *label, struct stmt *s)
{
      s->ref_prev = label->ref_last;
      s->ref_next = NULL;
      if (s->ref_prev) {
            s->ref_prev->ref_next = s;
      } else {
            label->ref_first = s;
      }
      label->ref_last = s;
}

void
label_ref_del(struct label *label, struct stmt *s)
{
      if (s->ref_prev) {
            s->ref_prev->ref_next = s->ref_next;
      } else {
            label->ref_first = s->ref_next;
      }
      if (s->ref_next) {
            s->ref_next->ref_prev = s->ref_prev;
      } else {
            label->ref_last = s->ref_prev;
      }

      label_free(label);
}

void
label_def_add(struct label *label, struct stmt *s)
{
      s->def_prev = label->def_last;
      s->def_next = NULL;
      if (s->def_prev) {
            s->def_prev->def_next = s;
      } else {
            label->def_first = s;
      }
      label->def_last = s;
}

void
label_def_del(struct label *label, struct stmt *s)
{
      if (s->def_prev) {
            s->def_prev->def_next = s->def_next;
      } else {
            label->def_first = s->def_next;
      }
      if (s->def_next) {
            s->def_next->def_prev = s->def_prev;
      } else {
            label->def_last = s->def_prev;
      }

      label_free(label);
}

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