121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/* Hash tables for the CPP library.
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Copyright (C) 1986-2017 Free Software Foundation, Inc.
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Written by Per Bothner, 1994.
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Based on CCCP program by Paul Rubin, June 1986
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Adapted to ANSI C, Richard Stallman, Jan 1987
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "internal.h"
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static hashnode alloc_node (cpp_hash_table *);
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/* Return an identifier node for hashtable.c. Used by cpplib except
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when integrated with the C front ends. */
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static hashnode
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alloc_node (cpp_hash_table *table)
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{
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cpp_hashnode *node;
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node = XOBNEW (&table->pfile->hash_ob, cpp_hashnode);
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memset (node, 0, sizeof (cpp_hashnode));
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return HT_NODE (node);
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}
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/* Set up the identifier hash table. Use TABLE if non-null, otherwise
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create our own. */
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void
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_cpp_init_hashtable (cpp_reader *pfile, cpp_hash_table *table)
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{
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struct spec_nodes *s;
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if (table == NULL)
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{
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pfile->our_hashtable = 1;
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table = ht_create (13); /* 8K (=2^13) entries. */
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table->alloc_node = alloc_node;
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obstack_specify_allocation (&pfile->hash_ob, 0, 0, xmalloc, free);
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}
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table->pfile = pfile;
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pfile->hash_table = table;
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/* Now we can initialize things that use the hash table. */
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_cpp_init_directives (pfile);
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_cpp_init_internal_pragmas (pfile);
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s = &pfile->spec_nodes;
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s->n_defined = cpp_lookup (pfile, DSC("defined"));
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s->n_true = cpp_lookup (pfile, DSC("true"));
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s->n_false = cpp_lookup (pfile, DSC("false"));
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s->n__VA_ARGS__ = cpp_lookup (pfile, DSC("__VA_ARGS__"));
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s->n__VA_ARGS__->flags |= NODE_DIAGNOSTIC;
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s->n__has_include__ = cpp_lookup (pfile, DSC("__has_include__"));
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s->n__has_include_next__ = cpp_lookup (pfile, DSC("__has_include_next__"));
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}
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/* Tear down the identifier hash table. */
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void
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_cpp_destroy_hashtable (cpp_reader *pfile)
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{
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if (pfile->our_hashtable)
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{
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ht_destroy (pfile->hash_table);
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obstack_free (&pfile->hash_ob, 0);
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}
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}
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/* Returns the hash entry for the STR of length LEN, creating one
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if necessary. */
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cpp_hashnode *
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cpp_lookup (cpp_reader *pfile, const unsigned char *str, unsigned int len)
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{
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/* ht_lookup cannot return NULL. */
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return CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_ALLOC));
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}
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/* Determine whether the str STR, of length LEN, is a defined macro. */
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int
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cpp_defined (cpp_reader *pfile, const unsigned char *str, int len)
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{
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cpp_hashnode *node;
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node = CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_NO_INSERT));
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/* If it's of type NT_MACRO, it cannot be poisoned. */
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return node && node->type == NT_MACRO;
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}
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/* We don't need a proxy since the hash table's identifier comes first
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in cpp_hashnode. However, in case this is ever changed, we have a
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static assertion for it. */
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extern char proxy_assertion_broken[offsetof (struct cpp_hashnode, ident) == 0 ? 1 : -1];
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/* For all nodes in the hashtable, callback CB with parameters PFILE,
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the node, and V. */
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void
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cpp_forall_identifiers (cpp_reader *pfile, cpp_cb cb, void *v)
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{
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ht_forall (pfile->hash_table, (ht_cb) cb, v);
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}
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