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91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* Hash tables.
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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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 2, 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; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef GCC_HASHTABLE_H
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#define GCC_HASHTABLE_H
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#include "obstack.h"
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/* This is what each hash table entry points to. It may be embedded
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deeply within another object. */
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typedef struct ht_identifier ht_identifier;
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struct ht_identifier
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{
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unsigned int len;
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const unsigned char *str;
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};
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#define HT_LEN(NODE) ((NODE)->len)
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#define HT_STR(NODE) ((NODE)->str)
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/* We want code outside cpplib, such as the compiler front-ends, to be
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able to include this header, and to be able to link with
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cpphashtbl.o without pulling in any other parts of cpplib. */
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struct cpp_reader;
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typedef struct ht hash_table;
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typedef struct ht_identifier *hashnode;
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enum ht_lookup_option {HT_NO_INSERT = 0, HT_ALLOC, HT_ALLOCED};
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/* An identifier hash table for cpplib and the front ends. */
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struct ht
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{
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/* Identifiers are allocated from here. */
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struct obstack stack;
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hashnode *entries;
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/* Call back. */
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hashnode (*alloc_node) PARAMS ((hash_table *));
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unsigned int nslots; /* Total slots in the entries array. */
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unsigned int nelements; /* Number of live elements. */
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/* Link to reader, if any. For the benefit of cpplib. */
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struct cpp_reader *pfile;
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/* Table usage statistics. */
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unsigned int searches;
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unsigned int collisions;
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};
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extern void gcc_obstack_init PARAMS ((struct obstack *));
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/* Initialise the hashtable with 2 ^ order entries. */
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extern hash_table *ht_create PARAMS ((unsigned int order));
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/* Frees all memory associated with a hash table. */
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extern void ht_destroy PARAMS ((hash_table *));
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extern hashnode ht_lookup PARAMS ((hash_table *, const unsigned char *,
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unsigned int, enum ht_lookup_option));
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/* For all nodes in TABLE, make a callback. The callback takes
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TABLE->PFILE, the node, and a PTR, and the callback sequence stops
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if the callback returns zero. */
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typedef int (*ht_cb) PARAMS ((struct cpp_reader *, hashnode, const void *));
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extern void ht_forall PARAMS ((hash_table *, ht_cb, const void *));
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/* Dump allocation statistics to stderr. */
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extern void ht_dump_statistics PARAMS ((hash_table *));
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/* Approximate positive square root of a host double. This is for
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statistical reports, not code generation. */
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extern double approx_sqrt PARAMS ((double));
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#endif /* GCC_HASHTABLE_H */
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