1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef V8_HEAP_SCAVENGER_INL_H_
6 #define V8_HEAP_SCAVENGER_INL_H_
7
8 #include "src/heap/scavenger.h"
9
10 namespace v8 {
11 namespace internal {
12
ScavengeObject(HeapObject ** p,HeapObject * object)13 void Scavenger::ScavengeObject(HeapObject** p, HeapObject* object) {
14 DCHECK(object->GetIsolate()->heap()->InFromSpace(object));
15
16 // We use the first word (where the map pointer usually is) of a heap
17 // object to record the forwarding pointer. A forwarding pointer can
18 // point to an old space, the code space, or the to space of the new
19 // generation.
20 MapWord first_word = object->map_word();
21
22 // If the first word is a forwarding address, the object has already been
23 // copied.
24 if (first_word.IsForwardingAddress()) {
25 HeapObject* dest = first_word.ToForwardingAddress();
26 DCHECK(object->GetIsolate()->heap()->InFromSpace(*p));
27 *p = dest;
28 return;
29 }
30
31 object->GetHeap()->UpdateAllocationSite(
32 object, object->GetHeap()->global_pretenuring_feedback_);
33
34 // AllocationMementos are unrooted and shouldn't survive a scavenge
35 DCHECK(object->map() != object->GetHeap()->allocation_memento_map());
36 // Call the slow part of scavenge object.
37 return ScavengeObjectSlow(p, object);
38 }
39
40
41 // static
VisitPointer(Heap * heap,HeapObject * obj,Object ** p)42 void StaticScavengeVisitor::VisitPointer(Heap* heap, HeapObject* obj,
43 Object** p) {
44 Object* object = *p;
45 if (!heap->InNewSpace(object)) return;
46 Scavenger::ScavengeObject(reinterpret_cast<HeapObject**>(p),
47 reinterpret_cast<HeapObject*>(object));
48 }
49
50 } // namespace internal
51 } // namespace v8
52
53 #endif // V8_HEAP_SCAVENGER_INL_H_
54