1 // Hash tables with 1 key and a value
7 #include "cl_iterator.h"
12 // - function bool equal (key1_type,key1_type);
13 // - function unsigned long hashcode (key1_type);
15 #if (defined(__alpha__) && !defined(__GNUC__))
16 template <class key1_type, class value_type> struct cl_htentry1;
19 template <class key1_type, class value_type>
21 ALLOCATE_ANYWHERE(cl_htentry1)
24 const value_type& htvalue () { return val; }
25 cl_htentry1 (const key1_type& k, const value_type& v)
27 #if (defined(__rs6000__) && !defined(__GNUC__))
32 template <class key1_type, class value_type>
33 struct cl_heap_hashtable_1 : public cl_heap_hashtable <cl_htentry1 <key1_type,value_type> > {
36 typedef cl_heap_hashtable <cl_htentry1 <key1_type,value_type> > inherited;
37 typedef typename inherited::htxentry htxentry;
40 void* operator new (size_t size) { return malloc_hook(size); }
42 void operator delete (void* ptr) { free_hook(ptr); }
44 // Lookup (htref alias gethash).
45 // Returns a pointer which you should immediately dereference
47 value_type* get (const key1_type& key)
49 var long index = this->_slots[hashcode(key) % this->_modulus] - 1;
51 if (!(index < this->_size))
52 throw runtime_exception();
53 if (equal(key,this->_entries[index].entry.key))
54 return &this->_entries[index].entry.val;
55 index = this->_entries[index].next - 1;
59 // Store (htset alias puthash).
60 void put (const key1_type& key, const value_type& val)
62 var unsigned long hcode = hashcode(key);
63 // Search whether it is already there.
65 var long index = this->_slots[hcode % this->_modulus] - 1;
67 if (!(index < this->_size))
68 throw runtime_exception();
69 if (equal(key,this->_entries[index].entry.key)) {
70 this->_entries[index].entry.val = val;
73 index = this->_entries[index].next - 1;
76 // Put it into the table.
78 var long hindex = hcode % this->_modulus; // _modulus may have changed!
79 var long index = this->get_free_index();
80 new (&this->_entries[index].entry) cl_htentry1<key1_type,value_type> (key,val);
81 this->_entries[index].next = this->_slots[hindex];
82 this->_slots[hindex] = 1+index;
85 // Remove (htrem alias remhash).
86 void remove (const key1_type& key)
88 var long* _index = &this->_slots[hashcode(key) % this->_modulus];
90 var long index = *_index - 1;
91 if (!(index < this->_size))
92 throw runtime_exception();
93 if (equal(key,this->_entries[index].entry.key)) {
94 // Remove _entries[index].entry
95 *_index = this->_entries[index].next;
96 this->_entries[index].~htxentry();
97 // The entry is now free.
98 this->put_free_index(index);
103 _index = &this->_entries[index].next;
106 // Iterate through the table.
107 // No stuff should be inserted into the table during the iteration,
108 // or you may find yourself iterating over an entry vector which has
109 // already been freed!
112 // Prepare a store operation: make sure that the free list is non-empty.
113 // This may change the table's size!
114 void prepare_store ()
116 #if !(defined(__sparc__) && !defined(__GNUC__))
117 if (this->_freelist < -1)
120 if (this->_garcol_fun(this))
121 if (this->_freelist < -1)
123 // No! Have to grow the hash table.
126 // workaround Sun C++ 4.1 inline function compiler bug
127 if (this->_freelist >= -1) {
128 if (!this->_garcol_fun(this) || (this->_freelist >= -1))
135 var long new_size = this->_size + (this->_size >> 1) + 1; // _size*1.5
136 var long new_modulus = inherited::compute_modulus(new_size);
137 var void* new_total_vector = malloc_hook(new_modulus*sizeof(long) + new_size*sizeof(htxentry));
138 var long* new_slots = (long*) ((char*)new_total_vector + 0);
139 var htxentry* new_entries = (htxentry *) ((char*)new_total_vector + new_modulus*sizeof(long));
140 for (var long hi = new_modulus-1; hi >= 0; hi--)
142 var long free_list_head = -1;
143 for (var long i = new_size-1; i >= 0; i--) {
144 new_entries[i].next = free_list_head;
145 free_list_head = -2-i;
147 var htxentry* old_entries = this->_entries;
148 for (var long old_index = 0; old_index < this->_size; old_index++)
149 if (old_entries[old_index].next >= 0) {
150 var key1_type& key = old_entries[old_index].entry.key;
151 var value_type& val = old_entries[old_index].entry.val;
152 var long hindex = hashcode(key) % new_modulus;
153 var long index = -2-free_list_head;
154 free_list_head = new_entries[index].next;
155 new (&new_entries[index].entry) cl_htentry1<key1_type,value_type> (key,val);
156 new_entries[index].next = new_slots[hindex];
157 new_slots[hindex] = 1+index;
158 old_entries[old_index].~htxentry();
160 free_hook(this->_total_vector);
161 this->_modulus = new_modulus;
162 this->_size = new_size;
163 this->_freelist = free_list_head;
164 this->_slots = new_slots;
165 this->_entries = new_entries;
166 this->_total_vector = new_total_vector;
172 #endif /* _CL_HASH1_H */