mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 07:31:32 +00:00
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/* Hash tables for the CPP library.
|
|
Copyright (C) 1986-2017 Free Software Foundation, Inc.
|
|
Written by Per Bothner, 1994.
|
|
Based on CCCP program by Paul Rubin, June 1986
|
|
Adapted to ANSI C, Richard Stallman, Jan 1987
|
|
|
|
This program 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 3, or (at your option) any
|
|
later version.
|
|
|
|
This program 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 this program; see the file COPYING3. If not see
|
|
<http://www.gnu.org/licenses/>.
|
|
|
|
In other words, you are welcome to use, share and improve this program.
|
|
You are forbidden to forbid anyone else to use, share and improve
|
|
what you give them. Help stamp out software-hoarding! */
|
|
|
|
#include "config.h"
|
|
#include "system.h"
|
|
#include "cpplib.h"
|
|
#include "internal.h"
|
|
|
|
static hashnode alloc_node (cpp_hash_table *);
|
|
|
|
/* Return an identifier node for hashtable.c. Used by cpplib except
|
|
when integrated with the C front ends. */
|
|
static hashnode
|
|
alloc_node (cpp_hash_table *table)
|
|
{
|
|
cpp_hashnode *node;
|
|
|
|
node = XOBNEW (&table->pfile->hash_ob, cpp_hashnode);
|
|
memset (node, 0, sizeof (cpp_hashnode));
|
|
return HT_NODE (node);
|
|
}
|
|
|
|
/* Set up the identifier hash table. Use TABLE if non-null, otherwise
|
|
create our own. */
|
|
void
|
|
_cpp_init_hashtable (cpp_reader *pfile, cpp_hash_table *table)
|
|
{
|
|
struct spec_nodes *s;
|
|
|
|
if (table == NULL)
|
|
{
|
|
pfile->our_hashtable = 1;
|
|
table = ht_create (13); /* 8K (=2^13) entries. */
|
|
table->alloc_node = alloc_node;
|
|
|
|
obstack_specify_allocation (&pfile->hash_ob, 0, 0, xmalloc, free);
|
|
}
|
|
|
|
table->pfile = pfile;
|
|
pfile->hash_table = table;
|
|
|
|
/* Now we can initialize things that use the hash table. */
|
|
_cpp_init_directives (pfile);
|
|
_cpp_init_internal_pragmas (pfile);
|
|
|
|
s = &pfile->spec_nodes;
|
|
s->n_defined = cpp_lookup (pfile, DSC("defined"));
|
|
s->n_true = cpp_lookup (pfile, DSC("true"));
|
|
s->n_false = cpp_lookup (pfile, DSC("false"));
|
|
s->n__VA_ARGS__ = cpp_lookup (pfile, DSC("__VA_ARGS__"));
|
|
s->n__VA_ARGS__->flags |= NODE_DIAGNOSTIC;
|
|
s->n__has_include__ = cpp_lookup (pfile, DSC("__has_include__"));
|
|
s->n__has_include_next__ = cpp_lookup (pfile, DSC("__has_include_next__"));
|
|
}
|
|
|
|
/* Tear down the identifier hash table. */
|
|
void
|
|
_cpp_destroy_hashtable (cpp_reader *pfile)
|
|
{
|
|
if (pfile->our_hashtable)
|
|
{
|
|
ht_destroy (pfile->hash_table);
|
|
obstack_free (&pfile->hash_ob, 0);
|
|
}
|
|
}
|
|
|
|
/* Returns the hash entry for the STR of length LEN, creating one
|
|
if necessary. */
|
|
cpp_hashnode *
|
|
cpp_lookup (cpp_reader *pfile, const unsigned char *str, unsigned int len)
|
|
{
|
|
/* ht_lookup cannot return NULL. */
|
|
return CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_ALLOC));
|
|
}
|
|
|
|
/* Determine whether the str STR, of length LEN, is a defined macro. */
|
|
int
|
|
cpp_defined (cpp_reader *pfile, const unsigned char *str, int len)
|
|
{
|
|
cpp_hashnode *node;
|
|
|
|
node = CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_NO_INSERT));
|
|
|
|
/* If it's of type NT_MACRO, it cannot be poisoned. */
|
|
return node && node->type == NT_MACRO;
|
|
}
|
|
|
|
/* We don't need a proxy since the hash table's identifier comes first
|
|
in cpp_hashnode. However, in case this is ever changed, we have a
|
|
static assertion for it. */
|
|
extern char proxy_assertion_broken[offsetof (struct cpp_hashnode, ident) == 0 ? 1 : -1];
|
|
|
|
/* For all nodes in the hashtable, callback CB with parameters PFILE,
|
|
the node, and V. */
|
|
void
|
|
cpp_forall_identifiers (cpp_reader *pfile, cpp_cb cb, void *v)
|
|
{
|
|
ht_forall (pfile->hash_table, (ht_cb) cb, v);
|
|
}
|