Do inline object filtering (via page flags) before call to RecordWriteStub.

src/spaces.cc

 // 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 380 matching lines @@
 }
 
 
 NewSpacePage* NewSpacePage::Initialize(Heap* heap, Address start) {
   MemoryChunk* chunk = MemoryChunk::Initialize(heap,
                                                start,
                                                Page::kPageSize,
                                                NOT_EXECUTABLE,
                                                heap->new_space());
   chunk->initialize_scan_on_scavenge(true);
+  heap->incremental_marking()->SetNewSpacePageFlags(chunk);
   return static_cast<NewSpacePage*>(chunk);
 }
 
 
 MemoryChunk* MemoryChunk::Initialize(Heap* heap,
                                      Address base,
                                      size_t size,
                                      Executability executable,
                                      Space* owner) {
   MemoryChunk* chunk = FromAddress(base);
 
   ASSERT(base == chunk->address());
 
   chunk->heap_ = heap;
   chunk->size_ = size;
   chunk->flags_ = 0;
   chunk->set_owner(owner);
   chunk->markbits()->Clear();
   chunk->initialize_scan_on_scavenge(false);
-  ASSERT(OFFSET_OF(MemoryChunk, scan_on_scavenge_) == kScanOnScavengeOffset);
   ASSERT(OFFSET_OF(MemoryChunk, flags_) == kFlagsOffset);
 
   if (executable == EXECUTABLE) chunk->SetFlag(IS_EXECUTABLE);
 
   if (owner == heap->old_data_space()) chunk->SetFlag(CONTAINS_ONLY_DATA);
 
   return chunk;
 }
 
 
@@ skipping 492 matching lines @@
                                                    from_space_.executable());
 }
 
 #endif
 
 
 void NewSpace::Flip() {
   SemiSpace tmp = from_space_;
   from_space_ = to_space_;
   to_space_ = tmp;
+
+  NewSpacePage* old_active_page = from_space_.current_page();
+  NewSpacePage* new_active_page = to_space_.current_page();
+  new_active_page->CopyFlagsFrom(old_active_page);
 }
 
 
 void NewSpace::Grow() {
   ASSERT(Capacity() < MaximumCapacity());
   if (to_space_.Grow()) {
     // Only grow from space if we managed to grow to space.
     if (!from_space_.Grow()) {
       // If we managed to grow to space but couldn't grow from space,
       // attempt to shrink to space.
@@ skipping 1320 matching lines @@
   for (HeapObject* obj = obj_it.next(); obj != NULL; obj = obj_it.next()) {
     if (obj->IsCode()) {
       Code* code = Code::cast(obj);
       isolate->code_kind_statistics()[code->kind()] += code->Size();
     }
   }
 }
 #endif  // DEBUG
 
 } }  // namespace v8::internal