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2a967f3d 1/* Hash tables for the CPP library.
5e7b4e25 2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998,
5d8ebbd8 3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
7f2935c7 4 Written by Per Bothner, 1994.
38e01259 5 Based on CCCP program by Paul Rubin, June 1986
7f2935c7
PB
6 Adapted to ANSI C, Richard Stallman, Jan 1987
7
8This program is free software; you can redistribute it and/or modify it
9under the terms of the GNU General Public License as published by the
10Free Software Foundation; either version 2, or (at your option) any
11later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
200031d1 20Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
7f2935c7
PB
21
22 In other words, you are welcome to use, share and improve this program.
23 You are forbidden to forbid anyone else to use, share and improve
24 what you give them. Help stamp out software-hoarding! */
25
b04cd507
KG
26#include "config.h"
27#include "system.h"
7f2935c7 28#include "cpplib.h"
4f4e53dd 29#include "internal.h"
e38992e8 30
6cf87ca4 31static cpp_hashnode *alloc_node (hash_table *);
7f2935c7 32
2a967f3d
NB
33/* Return an identifier node for hashtable.c. Used by cpplib except
34 when integrated with the C front ends. */
2a967f3d 35static cpp_hashnode *
6cf87ca4 36alloc_node (hash_table *table)
2964d54f 37{
2a967f3d 38 cpp_hashnode *node;
df383483 39
c3f829c1 40 node = XOBNEW (&table->pfile->hash_ob, cpp_hashnode);
fad205ff 41 memset (node, 0, sizeof (cpp_hashnode));
2a967f3d 42 return node;
d9e0bd53
ZW
43}
44
2a967f3d
NB
45/* Set up the identifier hash table. Use TABLE if non-null, otherwise
46 create our own. */
711b8824 47void
6cf87ca4 48_cpp_init_hashtable (cpp_reader *pfile, hash_table *table)
6de1e2a9 49{
f5e99456
NB
50 struct spec_nodes *s;
51
2a967f3d 52 if (table == NULL)
6de1e2a9 53 {
2a967f3d
NB
54 pfile->our_hashtable = 1;
55 table = ht_create (13); /* 8K (=2^13) entries. */
6cf87ca4 56 table->alloc_node = (hashnode (*) (hash_table *)) alloc_node;
43839642
ZW
57
58 _obstack_begin (&pfile->hash_ob, 0, 0,
59 (void *(*) (long)) xmalloc,
60 (void (*) (void *)) free);
b30892f9 61 }
711b8824 62
2a967f3d
NB
63 table->pfile = pfile;
64 pfile->hash_table = table;
f5e99456
NB
65
66 /* Now we can initialize things that use the hash table. */
67 _cpp_init_directives (pfile);
68 _cpp_init_internal_pragmas (pfile);
69
70 s = &pfile->spec_nodes;
f5e99456
NB
71 s->n_defined = cpp_lookup (pfile, DSC("defined"));
72 s->n_true = cpp_lookup (pfile, DSC("true"));
73 s->n_false = cpp_lookup (pfile, DSC("false"));
f5e99456
NB
74 s->n__VA_ARGS__ = cpp_lookup (pfile, DSC("__VA_ARGS__"));
75 s->n__VA_ARGS__->flags |= NODE_DIAGNOSTIC;
ba412f14
ZW
76}
77
2a967f3d 78/* Tear down the identifier hash table. */
2a967f3d 79void
6cf87ca4 80_cpp_destroy_hashtable (cpp_reader *pfile)
ba412f14 81{
2a967f3d 82 if (pfile->our_hashtable)
b30892f9 83 {
bef985f3 84 ht_destroy (pfile->hash_table);
2a967f3d 85 obstack_free (&pfile->hash_ob, 0);
b30892f9 86 }
45b966db
ZW
87}
88
2a967f3d
NB
89/* Returns the hash entry for the STR of length LEN, creating one
90 if necessary. */
711b8824 91cpp_hashnode *
6cf87ca4 92cpp_lookup (cpp_reader *pfile, const unsigned char *str, unsigned int len)
6de1e2a9 93{
2a967f3d
NB
94 /* ht_lookup cannot return NULL. */
95 return CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_ALLOC));
d9e0bd53 96}
3caee4a8 97
2a967f3d 98/* Determine whether the str STR, of length LEN, is a defined macro. */
2a967f3d 99int
6cf87ca4 100cpp_defined (cpp_reader *pfile, const unsigned char *str, int len)
d9e0bd53 101{
2a967f3d 102 cpp_hashnode *node;
3caee4a8 103
2a967f3d 104 node = CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_NO_INSERT));
d35364d1 105
2a967f3d
NB
106 /* If it's of type NT_MACRO, it cannot be poisoned. */
107 return node && node->type == NT_MACRO;
d35364d1
ZW
108}
109
2a967f3d
NB
110/* For all nodes in the hashtable, callback CB with parameters PFILE,
111 the node, and V. */
d35364d1 112void
6cf87ca4 113cpp_forall_identifiers (cpp_reader *pfile, cpp_cb cb, void *v)
d35364d1 114{
2a967f3d
NB
115 /* We don't need a proxy since the hash table's identifier comes
116 first in cpp_hashnode. */
117 ht_forall (pfile->hash_table, (ht_cb) cb, v);
a949941c 118}
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