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/* Lists of symbols for Bison
Copyright (C) 2002, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
Bison is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bison is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bison; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include <config.h>
#include "system.h"
#include "complain.h"
#include "symlist.h"
/*--------------------------------------.
| Create a list containing SYM at LOC. |
`--------------------------------------*/
symbol_list *
symbol_list_new (symbol *sym, location loc)
{
symbol_list *res = xmalloc (sizeof *res);
res->sym = sym;
res->location = loc;
res->midrule = NULL;
res->action = NULL;
res->used = false;
res->ruleprec = NULL;
res->dprec = 0;
res->merger = 0;
res->next = NULL;
return res;
}
/*------------------.
| Print this list. |
`------------------*/
void
symbol_list_print (const symbol_list *l, FILE *f)
{
for (/* Nothing. */; l && l->sym; l = l->next)
{
symbol_print (l->sym, f);
fprintf (stderr, l->used ? " used" : " unused");
if (l && l->sym)
fprintf (f, ", ");
}
}
/*---------------------------------.
| Prepend SYM at LOC to the LIST. |
`---------------------------------*/
symbol_list *
symbol_list_prepend (symbol_list *list, symbol *sym, location loc)
{
symbol_list *res = symbol_list_new (sym, loc);
res->next = list;
return res;
}
/*-------------------------------------------------.
| Free the LIST, but not the symbols it contains. |
`-------------------------------------------------*/
void
symbol_list_free (symbol_list *list)
{
LIST_FREE (symbol_list, list);
}
/*--------------------.
| Return its length. |
`--------------------*/
unsigned int
symbol_list_length (const symbol_list *l)
{
int res = 0;
for (/* Nothing. */; l; l = l->next)
++res;
return res;
}
/*--------------------------------.
| Get symbol N in symbol list L. |
`--------------------------------*/
symbol_list *
symbol_list_n_get (symbol_list *l, int n)
{
int i;
if (n < 0)
return NULL;
for (i = 0; i < n; ++i)
{
l = l->next;
if (l == NULL || l->sym == NULL)
return NULL;
}
return l;
}
/*--------------------------------------------------------------.
| Get the data type (alternative in the union) of the value for |
| symbol N in symbol list L. |
`--------------------------------------------------------------*/
uniqstr
symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
{
l = symbol_list_n_get (l, n);
if (!l)
{
complain_at (loc, _("invalid $ value: $%d"), n);
return NULL;
}
return l->sym->type_name;
}
/*----------------------------------------.
| The symbol N in symbol list L is USED. |
`----------------------------------------*/
void
symbol_list_n_used_set (symbol_list *l, int n, bool used)
{
l = symbol_list_n_get (l, n);
if (l)
l->used = used;
}
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