Support compaction for code space pages.

src/mark-compact-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_MARK_COMPACT_INL_H_
 #define V8_MARK_COMPACT_INL_H_
 
 #include "isolate.h"
 #include "memory.h"
 #include "mark-compact.h"
 
+
 namespace v8 {
 namespace internal {
 
 
 MarkBit Marking::MarkBitFrom(Address addr) {
   MemoryChunk *p = MemoryChunk::FromAddress(addr);
   return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
                                          p->ContainsOnlyData());
 }
 
@@ skipping 27 matching lines @@
 }
 
 
 bool MarkCompactCollector::IsMarked(Object* obj) {
   ASSERT(obj->IsHeapObject());
   HeapObject* heap_object = HeapObject::cast(obj);
   return Marking::MarkBitFrom(heap_object).Get();
 }
 
 
+void MarkCompactCollector::RecordSlot(Object** anchor_slot,
+                                      Object** slot,
+                                      Object* object) {
+  Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
+  if (object_page->IsEvacuationCandidate() &&
+      !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
+    if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
+                            object_page->slots_buffer_address(),
+                            slot,
+                            SlotsBuffer::FAIL_ON_OVERFLOW)) {
+      EvictEvacuationCandidate(object_page);
+    }
+  }
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_INL_H_