[heap] Black allocation.

src/heap/spaces-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_SPACES_INL_H_
 #define V8_HEAP_SPACES_INL_H_
 
 #include "src/heap/incremental-marking.h"
 #include "src/heap/spaces.h"
 #include "src/isolate.h"
 #include "src/msan.h"
 #include "src/profiler/heap-profiler.h"
 #include "src/v8memory.h"
 
 namespace v8 {
 namespace internal {
 
 
 // -----------------------------------------------------------------------------
 // Bitmap
 
 void Bitmap::Clear(MemoryChunk* chunk) {
   Bitmap* bitmap = chunk->markbits();
   for (int i = 0; i < bitmap->CellsCount(); i++) bitmap->cells()[i] = 0;
   chunk->ResetLiveBytes();
 }
 
+void Bitmap::SetAllBits(MemoryChunk* chunk) {
+  Bitmap* bitmap = chunk->markbits();
+  for (int i = 0; i < bitmap->CellsCount(); i++)
+    bitmap->cells()[i] = 0xffffffff;
+}
 
 // -----------------------------------------------------------------------------
 // PageIterator
 
 PageIterator::PageIterator(PagedSpace* space)
     : space_(space),
       prev_page_(&space->anchor_),
       next_page_(prev_page_->next_page()) {}
 
 
@@ skipping 232 matching lines @@
 
 void MemoryChunk::ResetLiveBytes() {
   if (FLAG_trace_live_bytes) {
     PrintIsolate(heap()->isolate(), "live-bytes: reset page=%p %d->0\n", this,
                  live_byte_count_);
   }
   live_byte_count_ = 0;
 }
 
 void MemoryChunk::IncrementLiveBytes(int by) {
+  if (IsFlagSet(BLACK_PAGE)) return;
   if (FLAG_trace_live_bytes) {
     PrintIsolate(heap()->isolate(),
                  "live-bytes: update page=%p delta=%d %d->%d\n", this, by,
                  live_byte_count_, live_byte_count_ + by);
   }
   live_byte_count_ += by;
   DCHECK_GE(live_byte_count_, 0);
   DCHECK_LE(static_cast<size_t>(live_byte_count_), size_);
 }
 
@@ skipping 335 matching lines @@
     other->allocation_info_.Reset(nullptr, nullptr);
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_INL_H_