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Issue 115086: Change the scavenging collector so that promoted objects do not reside... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 11 years, 7 months ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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184 } else { 184 } else {
185 int remaining = byte_size / kPointerSize; 185 int remaining = byte_size / kPointerSize;
186 do { 186 do {
187 remaining--; 187 remaining--;
188 *dst++ = *src++; 188 *dst++ = *src++;
189 } while (remaining > 0); 189 } while (remaining > 0);
190 } 190 }
191 } 191 }
192 192
193 193
194 void Heap::ScavengeObject(HeapObject** p, HeapObject* object) {
195 ASSERT(InFromSpace(object));
196
197 // We use the first word (where the map pointer usually is) of a heap
198 // object to record the forwarding pointer. A forwarding pointer can
199 // point to an old space, the code space, or the to space of the new
200 // generation.
201 MapWord first_word = object->map_word();
202
203 // If the first word is a forwarding address, the object has already been
204 // copied.
205 if (first_word.IsForwardingAddress()) {
206 *p = first_word.ToForwardingAddress();
207 return;
208 }
209
210 // Call the slow part of scavenge object.
211 return ScavengeObjectSlow(p, object);
212 }
213
214
194 Object* Heap::GetKeyedLookupCache() { 215 Object* Heap::GetKeyedLookupCache() {
195 if (keyed_lookup_cache()->IsUndefined()) { 216 if (keyed_lookup_cache()->IsUndefined()) {
196 Object* obj = LookupCache::Allocate(4); 217 Object* obj = LookupCache::Allocate(4);
197 if (obj->IsFailure()) return obj; 218 if (obj->IsFailure()) return obj;
198 keyed_lookup_cache_ = obj; 219 keyed_lookup_cache_ = obj;
199 } 220 }
200 return keyed_lookup_cache(); 221 return keyed_lookup_cache();
201 } 222 }
202 223
203 224
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277 allocation_allowed_ = new_state; 298 allocation_allowed_ = new_state;
278 return old; 299 return old;
279 } 300 }
280 301
281 #endif 302 #endif
282 303
283 304
284 } } // namespace v8::internal 305 } } // namespace v8::internal
285 306
286 #endif // V8_HEAP_INL_H_ 307 #endif // V8_HEAP_INL_H_
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