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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libcpp/] [include/] [symtab.h] - Blame information for rev 730

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1 730 jeremybenn
/* Hash tables.
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   Copyright (C) 2000, 2001, 2003, 2004, 2007, 2008, 2009, 2010
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   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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  const unsigned char *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 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) (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 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 (hash_table *);
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extern hashnode ht_lookup (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 (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 (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 (hash_table *, ht_cb, const void *);
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/* Restore the hash table.  */
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extern void ht_load (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 (hash_table *);
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#endif /* LIBCPP_SYMTAB_H */

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