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1 /* Hash tables.
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2 Copyright (C) 2000, 2001, 2003, 2004, 2007, 2008, 2009
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3 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 3, or (at your option) any
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8 later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; see the file COPYING3. If not see
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17 <http://www.gnu.org/licenses/>. */
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18
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19 #ifndef LIBCPP_SYMTAB_H
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20 #define LIBCPP_SYMTAB_H
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21
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22 #include "obstack.h"
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23 #ifndef GTY
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24 #define GTY(x) /* nothing */
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25 #endif
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26
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27 /* This is what each hash table entry points to. It may be embedded
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28 deeply within another object. */
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29 typedef struct ht_identifier ht_identifier;
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30 struct ht_identifier GTY(())
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31 {
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32 const unsigned char *str;
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33 unsigned int len;
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34 unsigned int hash_value;
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35 };
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36
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37 #define HT_LEN(NODE) ((NODE)->len)
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38 #define HT_STR(NODE) ((NODE)->str)
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39
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40 typedef struct ht hash_table;
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41 typedef struct ht_identifier *hashnode;
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42
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43 enum ht_lookup_option {HT_NO_INSERT = 0, HT_ALLOC};
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44
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45 /* An identifier hash table for cpplib and the front ends. */
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46 struct ht
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47 {
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48 /* Identifiers are allocated from here. */
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49 struct obstack stack;
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50
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51 hashnode *entries;
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52 /* Call back, allocate a node. */
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53 hashnode (*alloc_node) (hash_table *);
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54 /* Call back, allocate something that hangs off a node like a cpp_macro.
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55 NULL means use the usual allocator. */
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56 void * (*alloc_subobject) (size_t);
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57
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58 unsigned int nslots; /* Total slots in the entries array. */
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59 unsigned int nelements; /* Number of live elements. */
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60
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61 /* Link to reader, if any. For the benefit of cpplib. */
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62 struct cpp_reader *pfile;
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63
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64 /* Table usage statistics. */
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65 unsigned int searches;
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66 unsigned int collisions;
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67
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68 /* Should 'entries' be freed when it is no longer needed? */
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69 bool entries_owned;
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70 };
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71
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72 /* Initialize the hashtable with 2 ^ order entries. */
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73 extern hash_table *ht_create (unsigned int order);
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74
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75 /* Frees all memory associated with a hash table. */
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76 extern void ht_destroy (hash_table *);
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77
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78 extern hashnode ht_lookup (hash_table *, const unsigned char *,
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79 size_t, enum ht_lookup_option);
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80 extern hashnode ht_lookup_with_hash (hash_table *, const unsigned char *,
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81 size_t, unsigned int,
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82 enum ht_lookup_option);
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83 #define HT_HASHSTEP(r, c) ((r) * 67 + ((c) - 113));
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84 #define HT_HASHFINISH(r, len) ((r) + (len))
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85
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86 /* For all nodes in TABLE, make a callback. The callback takes
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87 TABLE->PFILE, the node, and a PTR, and the callback sequence stops
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88 if the callback returns zero. */
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89 typedef int (*ht_cb) (struct cpp_reader *, hashnode, const void *);
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90 extern void ht_forall (hash_table *, ht_cb, const void *);
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91
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92 /* For all nodes in TABLE, call the callback. If the callback returns
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93 a nonzero value, the node is removed from the table. */
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94 extern void ht_purge (hash_table *, ht_cb, const void *);
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95
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96 /* Restore the hash table. */
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97 extern void ht_load (hash_table *ht, hashnode *entries,
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98 unsigned int nslots, unsigned int nelements, bool own);
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99
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100 /* Dump allocation statistics to stderr. */
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101 extern void ht_dump_statistics (hash_table *);
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102
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103 #endif /* LIBCPP_SYMTAB_H */
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