107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
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/* Hash tables.
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Copyright (C) 2000-2023 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 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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#ifndef LIBCPP_SYMTAB_H
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#define LIBCPP_SYMTAB_H
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#include "obstack.h"
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#ifndef GTY
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#define GTY(x) /* nothing */
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#endif
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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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typedef struct ht_identifier *ht_identifier_ptr;
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struct GTY(()) ht_identifier {
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/* This GTY markup arranges that the null-terminated identifier would still
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stream to PCH correctly, if a null byte were to make its way into an
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identifier somehow. */
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const unsigned char * GTY((string_length ("1 + %h.len"))) str;
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unsigned int len;
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unsigned int hash_value;
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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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typedef struct ht cpp_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};
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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, allocate a node. */
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hashnode (*alloc_node) (cpp_hash_table *);
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/* Call back, allocate something that hangs off a node like a cpp_macro.
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NULL means use the usual allocator. */
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void * (*alloc_subobject) (size_t);
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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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/* Should 'entries' be freed when it is no longer needed? */
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bool entries_owned;
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};
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/* Initialize the hashtable with 2 ^ order entries. */
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extern cpp_hash_table *ht_create (unsigned int order);
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/* Frees all memory associated with a hash table. */
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extern void ht_destroy (cpp_hash_table *);
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extern hashnode ht_lookup (cpp_hash_table *, const unsigned char *,
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size_t, enum ht_lookup_option);
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extern hashnode ht_lookup_with_hash (cpp_hash_table *, const unsigned char *,
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size_t, unsigned int,
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enum ht_lookup_option);
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#define HT_HASHSTEP(r, c) ((r) * 67 + ((c) - 113));
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#define HT_HASHFINISH(r, len) ((r) + (len))
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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) (struct cpp_reader *, hashnode, const void *);
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extern void ht_forall (cpp_hash_table *, ht_cb, const void *);
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/* For all nodes in TABLE, call the callback. If the callback returns
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a nonzero value, the node is removed from the table. */
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extern void ht_purge (cpp_hash_table *, ht_cb, const void *);
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/* Restore the hash table. */
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extern void ht_load (cpp_hash_table *ht, hashnode *entries,
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unsigned int nslots, unsigned int nelements, bool own);
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/* Dump allocation statistics to stderr. */
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extern void ht_dump_statistics (cpp_hash_table *);
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#endif /* LIBCPP_SYMTAB_H */
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