Annotation of parser3/src/main/pa_hash.C, revision 1.35
1.25 paf 1: /** @file
1.26 paf 2: Parser: hash class.
3:
1.19 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.26 paf 5:
1.20 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.19 paf 7:
1.35 ! parser 8: $Id: pa_hash.C,v 1.34 2001/04/23 08:52:24 paf Exp $
1.1 paf 9: */
10:
11: /*
12: The prime numbers used from zend_hash.c,
13: the part of Zend scripting engine library,
14: Copyrighted (C) 1999-2000 Zend Technologies Ltd.
15: http://www.zend.com/license/0_92.txt
16: For more information about Zend please visit http://www.zend.com/
17: */
1.23 paf 18:
1.11 paf 19: #include "pa_hash.h"
1.2 paf 20:
1.8 paf 21: void *Hash::Pair::operator new(size_t size, Pool& apool) {
22: return apool.malloc(size);
1.2 paf 23: }
24:
1.1 paf 25: /* Zend comment: Generated on an Octa-ALPHA 300MHz CPU & 2.5GB RAM monster */
1.18 paf 26: uint Hash::allocates[]={
1.1 paf 27: 5, 11, 19, 53, 107, 223, 463, 983, 1979, 3907, 7963,
28: 16229, 32531, 65407, 130987, 262237, 524521, 1048793,
29: 2097397, 4194103, 8388857, 16777447, 33554201, 67108961,
30: 134217487, 268435697, 536870683, 1073741621, 2147483399};
1.18 paf 31: int Hash::allocates_count=
32: sizeof(allocates)/sizeof(uint);
1.1 paf 33:
34:
1.31 paf 35: void Hash::construct(Pool& apool) {
1.18 paf 36: allocated=allocates[allocates_index=0];
37: threshold=allocated*THRESHOLD_PERCENT/100;
1.1 paf 38: used=0;
1.18 paf 39: refs=static_cast<Pair **>(calloc(sizeof(Pair *)*allocated));
1.1 paf 40: }
41:
42: void Hash::expand() {
1.18 paf 43: int old_size=allocated;
1.2 paf 44: Pair **old_refs=refs;
1.4 paf 45:
1.2 paf 46: // allocated bigger refs array
1.18 paf 47: allocates_index=allocates_index+1<allocates_count?allocates_index+1:allocates_count-1;
48: allocated=allocates[allocates_index];
1.33 paf 49: threshold=allocated*THRESHOLD_PERCENT/100;
1.18 paf 50: refs=static_cast<Pair **>(calloc(sizeof(Pair *)*allocated));
1.1 paf 51:
52: // rehash
1.2 paf 53: Pair **old_ref=old_refs;
54: for(int old_index=0; old_index<old_size; old_index++)
55: for(Pair *pair=*old_ref++; pair; ) {
56: Pair *linked_pair=pair->link;
57:
1.18 paf 58: uint new_index=pair->code%allocated;
1.2 paf 59: Pair **new_ref=&refs[new_index];
60: pair->link=*new_ref;
61: *new_ref=pair;
1.1 paf 62:
1.2 paf 63: pair=linked_pair;
64: }
1.1 paf 65: }
66:
1.18 paf 67: uint Hash::generic_code(uint aresult, const char *start, uint allocated) {
1.1 paf 68: uint result=aresult, g;
1.18 paf 69: const char *end=start+allocated;
1.1 paf 70:
71: while (start<end) {
72: result=(result<<4)+*start++;
73: if ((g=(result&0xF0000000))) {
74: result=result^(g>>24);
75: result=result^g;
76: }
77: }
78: return result;
79: }
80:
1.31 paf 81: bool Hash::put(const Key& key, Val *value) {
1.1 paf 82: if(full())
83: expand();
84:
1.2 paf 85: uint code=key.hash_code();
1.18 paf 86: uint index=code%allocated;
1.2 paf 87: Pair **ref=&refs[index];
88: for(Pair *pair=*ref; pair; pair=pair->link)
89: if(pair->code==code && pair->key==key) {
90: // found a pair with the same key
91: pair->value=value;
1.17 paf 92: return true;
1.1 paf 93: }
1.2 paf 94:
1.7 paf 95: // proper pair not found -- create&link_in new pair
1.17 paf 96: if(!*ref) // root cell were used?
97: used++; // not, we'll use it and record the fact
1.15 paf 98: *ref=NEW Pair(code, key, value, *ref);
1.17 paf 99: return false;
1.1 paf 100: }
101:
1.31 paf 102: Hash::Val *Hash::get(const Key& key) const {
1.2 paf 103: uint code=key.hash_code();
1.18 paf 104: uint index=code%allocated;
1.2 paf 105: for(Pair *pair=refs[index]; pair; pair=pair->link)
1.1 paf 106: if(pair->code==code && pair->key==key)
107: return pair->value;
108:
109: return 0;
110: }
1.16 paf 111:
1.31 paf 112: bool Hash::put_replace(const Key& key, Val *value) {
1.16 paf 113: uint code=key.hash_code();
1.18 paf 114: uint index=code%allocated;
1.16 paf 115: for(Pair *pair=refs[index]; pair; pair=pair->link)
116: if(pair->code==code && pair->key==key) {
117: // found a pair with the same key, replacing
118: pair->value=value;
119: return true;
120: }
121:
122: // proper pair not found
123: return false;
124: }
125:
1.31 paf 126: bool Hash::put_dont_replace(const Key& key, Val *value) {
1.17 paf 127: if(full())
128: expand();
129:
130: uint code=key.hash_code();
1.18 paf 131: uint index=code%allocated;
1.17 paf 132: Pair **ref=&refs[index];
133: for(Pair *pair=*ref; pair; pair=pair->link)
134: if(pair->code==code && pair->key==key) {
135: // found a pair with the same key, NOT replacing
136: return true;
137: }
138:
139: // proper pair not found -- create&link_in new pair
140: *ref=NEW Pair(code, key, value, *ref);
141: if(!*ref) // root cell were used?
142: used++; // not, we'll use it and record the fact
143: return false;
144: }
145:
1.31 paf 146: void Hash::merge_dont_replace(const Hash& src) {
1.18 paf 147: for(int i=0; i<src.allocated; i++)
1.17 paf 148: for(Pair *pair=src.refs[i]; pair; pair=pair->link)
149: put_dont_replace(pair->key, pair->value);
1.18 paf 150: // MAY:optimize this.allocated==src.allocated case
1.21 paf 151: }
152:
1.32 paf 153: void Hash::for_each(For_each_func func, void *info) const {
1.21 paf 154: Pair **ref=refs;
155: for(int index=0; index<allocated; index++)
156: for(Pair *pair=*ref++; pair; pair=pair->link)
1.24 paf 157: if(pair->value)
158: (*func)(pair->key, pair->value, info);
1.34 paf 159: }
160:
161: Hash::Val* Hash::first_that(First_that_func func, void *info) const {
162: Pair **ref=refs;
163: for(int index=0; index<allocated; index++)
164: for(Pair *pair=*ref++; pair; pair=pair->link)
165: if(pair->value)
166: if((*func)(pair->key, pair->value, info))
167: return pair->value;
168: return 0;
1.23 paf 169: }
170:
1.31 paf 171: void Hash::clear() {
1.23 paf 172: memset(refs, 0, sizeof(*refs)*allocated);
173: used=0;
1.17 paf 174: }
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