mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/* Hash tables.
|
|
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
|
|
|
|
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 2, 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; if not, write to the Free Software
|
|
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#ifndef GCC_HASHTABLE_H
|
|
#define GCC_HASHTABLE_H
|
|
|
|
#include "obstack.h"
|
|
|
|
/* This is what each hash table entry points to. It may be embedded
|
|
deeply within another object. */
|
|
typedef struct ht_identifier ht_identifier;
|
|
struct ht_identifier GTY(())
|
|
{
|
|
const unsigned char *str;
|
|
unsigned int len;
|
|
unsigned int hash_value;
|
|
};
|
|
|
|
#define HT_LEN(NODE) ((NODE)->len)
|
|
#define HT_STR(NODE) ((NODE)->str)
|
|
|
|
/* We want code outside cpplib, such as the compiler front-ends, to be
|
|
able to include this header, and to be able to link with
|
|
cpphashtbl.o without pulling in any other parts of cpplib. */
|
|
|
|
struct cpp_reader;
|
|
typedef struct ht hash_table;
|
|
typedef struct ht_identifier *hashnode;
|
|
|
|
enum ht_lookup_option {HT_NO_INSERT = 0, HT_ALLOC, HT_ALLOCED};
|
|
|
|
/* An identifier hash table for cpplib and the front ends. */
|
|
struct ht
|
|
{
|
|
/* Identifiers are allocated from here. */
|
|
struct obstack stack;
|
|
|
|
hashnode *entries;
|
|
/* Call back. */
|
|
hashnode (*alloc_node) PARAMS ((hash_table *));
|
|
|
|
unsigned int nslots; /* Total slots in the entries array. */
|
|
unsigned int nelements; /* Number of live elements. */
|
|
|
|
/* Link to reader, if any. For the benefit of cpplib. */
|
|
struct cpp_reader *pfile;
|
|
|
|
/* Table usage statistics. */
|
|
unsigned int searches;
|
|
unsigned int collisions;
|
|
};
|
|
|
|
extern void gcc_obstack_init PARAMS ((struct obstack *));
|
|
|
|
/* Initialize the hashtable with 2 ^ order entries. */
|
|
extern hash_table *ht_create PARAMS ((unsigned int order));
|
|
|
|
/* Frees all memory associated with a hash table. */
|
|
extern void ht_destroy PARAMS ((hash_table *));
|
|
|
|
extern hashnode ht_lookup PARAMS ((hash_table *, const unsigned char *,
|
|
unsigned int, enum ht_lookup_option));
|
|
|
|
/* For all nodes in TABLE, make a callback. The callback takes
|
|
TABLE->PFILE, the node, and a PTR, and the callback sequence stops
|
|
if the callback returns zero. */
|
|
typedef int (*ht_cb) PARAMS ((struct cpp_reader *, hashnode, const void *));
|
|
extern void ht_forall PARAMS ((hash_table *, ht_cb, const void *));
|
|
|
|
/* Dump allocation statistics to stderr. */
|
|
extern void ht_dump_statistics PARAMS ((hash_table *));
|
|
|
|
/* Approximate positive square root of a host double. This is for
|
|
statistical reports, not code generation. */
|
|
extern double approx_sqrt PARAMS ((double));
|
|
|
|
#endif /* GCC_HASHTABLE_H */
|