2 Copyright (C) 2000, 2001 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 2, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 #ifndef GCC_HASHTABLE_H
19 #define GCC_HASHTABLE_H
21 #if defined(__APPLE__) && defined(__MACH__)
22 #include "libiberty/obstack.h"
27 /* This is what each hash table entry points to. It may be embedded
28 deeply within another object. */
29 typedef struct ht_identifier ht_identifier;
33 const unsigned char *str;
36 #define HT_LEN(NODE) ((NODE)->len)
37 #define HT_STR(NODE) ((NODE)->str)
39 /* We want code outside cpplib, such as the compiler front-ends, to be
40 able to include this header, and to be able to link with
41 cpphashtbl.o without pulling in any other parts of cpplib. */
44 typedef struct ht hash_table;
45 typedef struct ht_identifier *hashnode;
47 enum ht_lookup_option {HT_NO_INSERT = 0, HT_ALLOC, HT_ALLOCED};
49 /* An identifier hash table for cpplib and the front ends. */
52 /* Identifiers are allocated from here. */
57 hashnode (*alloc_node) PARAMS ((hash_table *));
59 unsigned int nslots; /* Total slots in the entries array. */
60 unsigned int nelements; /* Number of live elements. */
62 /* Link to reader, if any. For the benefit of cpplib. */
63 struct cpp_reader *pfile;
65 /* Table usage statistics. */
66 unsigned int searches;
67 unsigned int collisions;
70 extern void gcc_obstack_init PARAMS ((struct obstack *));
71 /* Initialise the hashtable with 2 ^ order entries. */
72 extern hash_table *ht_create PARAMS ((unsigned int order));
73 extern hashnode ht_lookup PARAMS ((hash_table *, const unsigned char *,
74 unsigned int, enum ht_lookup_option));
76 /* For all nodes in TABLE, make a callback. The callback takes
77 TABLE->PFILE, the node, and a PTR, and the callback sequence stops
78 if the callback returns zero. */
79 typedef int (*ht_cb) PARAMS ((struct cpp_reader *, hashnode, const void *));
80 extern void ht_forall PARAMS ((hash_table *, ht_cb, const void *));
82 /* Dump allocation statistics to stderr. */
83 extern void ht_dump_statistics PARAMS ((hash_table *));
85 /* Approximate positive square root of a host double. This is for
86 statistical reports, not code generation. */
87 extern double approx_sqrt PARAMS ((double));
89 #endif /* GCC_HASHTABLE_H */