2 see copyright notice in squirrel.h
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4 #include "sqpcheader.h"
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7 #include "sqfuncproto.h"
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8 #include "sqclosure.h"
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10 SQTable::SQTable(SQSharedState *ss,SQInteger nInitialSize)
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12 SQInteger pow2size=MINPOWER2;
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13 while(nInitialSize>pow2size)pow2size=pow2size<<1;
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14 AllocNodes(pow2size);
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18 ADD_TO_CHAIN(&_sharedstate->_gc_chain,this);
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21 void SQTable::Remove(const SQObjectPtr &key)
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24 _HashNode *n = _Get(key, HashObj(key) & (_numofnodes - 1));
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26 n->val = n->key = _null_;
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32 void SQTable::AllocNodes(SQInteger nSize)
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34 _HashNode *nodes=(_HashNode *)SQ_MALLOC(sizeof(_HashNode)*nSize);
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35 for(SQInteger i=0;i<nSize;i++){
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36 new (&nodes[i]) _HashNode;
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41 _firstfree=&_nodes[_numofnodes-1];
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44 void SQTable::Rehash(bool force)
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46 SQInteger oldsize=_numofnodes;
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47 //prevent problems with the integer division
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48 if(oldsize<4)oldsize=4;
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49 _HashNode *nold=_nodes;
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50 SQInteger nelems=CountUsed();
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51 if (nelems >= oldsize-oldsize/4) /* using more than 3/4? */
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52 AllocNodes(oldsize*2);
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53 else if (nelems <= oldsize/4 && /* less than 1/4? */
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54 oldsize > MINPOWER2)
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55 AllocNodes(oldsize/2);
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57 AllocNodes(oldsize);
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61 for (SQInteger i=0; i<oldsize; i++) {
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62 _HashNode *old = nold+i;
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63 if (type(old->key) != OT_NULL)
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64 NewSlot(old->key,old->val);
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66 for(SQInteger k=0;k<oldsize;k++)
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67 nold[k].~_HashNode();
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68 SQ_FREE(nold,oldsize*sizeof(_HashNode));
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71 SQTable *SQTable::Clone()
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73 SQTable *nt=Create(_opt_ss(this),_numofnodes);
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75 SQObjectPtr key,val;
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76 while((ridx=Next(true,ridx,key,val))!=-1){
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77 nt->NewSlot(key,val);
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79 nt->SetDelegate(_delegate);
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83 bool SQTable::Get(const SQObjectPtr &key,SQObjectPtr &val)
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85 if(type(key) == OT_NULL)
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87 _HashNode *n = _Get(key, HashObj(key) & (_numofnodes - 1));
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89 val = _realval(n->val);
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94 bool SQTable::NewSlot(const SQObjectPtr &key,const SQObjectPtr &val)
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96 assert(type(key) != OT_NULL);
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97 SQHash h = HashObj(key) & (_numofnodes - 1);
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98 _HashNode *n = _Get(key, h);
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103 _HashNode *mp = &_nodes[h];
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107 //key not found I'll insert it
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108 //main pos is not free
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110 if(type(mp->key) != OT_NULL) {
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111 n = _firstfree; /* get a free place */
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112 SQHash mph = HashObj(mp->key) & (_numofnodes - 1);
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113 _HashNode *othern; /* main position of colliding node */
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115 if (mp > n && (othern = &_nodes[mph]) != mp){
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116 /* yes; move colliding node into free position */
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117 while (othern->next != mp){
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118 assert(othern->next != NULL);
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119 othern = othern->next; /* find previous */
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121 othern->next = n; /* redo the chain with `n' in place of `mp' */
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123 n->val = mp->val;/* copy colliding node into free pos. (mp->next also goes) */
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124 n->next = mp->next;
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127 mp->next = NULL; /* now `mp' is free */
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130 /* new node will go into free position */
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131 n->next = mp->next; /* chain new position */
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138 for (;;) { /* correct `firstfree' */
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139 if (type(_firstfree->key) == OT_NULL && _firstfree->next == NULL) {
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142 return true; /* OK; table still has a free place */
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144 else if (_firstfree == _nodes) break; /* cannot decrement from here */
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145 else (_firstfree)--;
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148 return NewSlot(key, val);
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151 SQInteger SQTable::Next(bool getweakrefs,const SQObjectPtr &refpos, SQObjectPtr &outkey, SQObjectPtr &outval)
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153 SQInteger idx = (SQInteger)TranslateIndex(refpos);
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154 while (idx < _numofnodes) {
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155 if(type(_nodes[idx].key) != OT_NULL) {
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157 _HashNode &n = _nodes[idx];
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159 outval = getweakrefs?(SQObject)n.val:_realval(n.val);
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160 //return idx for the next iteration
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165 //nothing to iterate anymore
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170 bool SQTable::Set(const SQObjectPtr &key, const SQObjectPtr &val)
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172 _HashNode *n = _Get(key, HashObj(key) & (_numofnodes - 1));
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180 void SQTable::Finalize()
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182 for(SQInteger i = 0;i < _numofnodes; i++) { _nodes[i].key = _null_; _nodes[i].val = _null_; }
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