[heap] Reland "Remove black pages and use black areas instead."

src/heap/incremental-marking.cc

 // Copyright 2012 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.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 146 matching lines @@
     Marking::AnyToGrey(mark_bit);
   }
 }
 
 void IncrementalMarking::TransferMark(Heap* heap, Address old_start,
                                       Address new_start) {
   // This is only used when resizing an object.
   DCHECK(MemoryChunk::FromAddress(old_start) ==
          MemoryChunk::FromAddress(new_start));
 
-  if (!heap->incremental_marking()->IsMarking() ||
-      Page::FromAddress(old_start)->IsFlagSet(Page::BLACK_PAGE))
-    return;
+  if (!heap->incremental_marking()->IsMarking()) return;
 
   // If the mark doesn't move, we don't check the color of the object.
   // It doesn't matter whether the object is black, since it hasn't changed
   // size, so the adjustment to the live data count will be zero anyway.
   if (old_start == new_start) return;
 
   MarkBit new_mark_bit = ObjectMarking::MarkBitFrom(new_start);
   MarkBit old_mark_bit = ObjectMarking::MarkBitFrom(old_start);
 
 #ifdef DEBUG
@@ skipping 416 matching lines @@
   // Ready to start incremental marking.
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Running\n");
   }
 }
 
 void IncrementalMarking::StartBlackAllocation() {
   DCHECK(FLAG_black_allocation);
   DCHECK(IsMarking());
   black_allocation_ = true;
-  OldSpace* old_space = heap()->old_space();
-  old_space->EmptyAllocationInfo();
-  old_space->free_list()->Reset();
+  heap()->old_space()->MarkAllocationInfoBlack();
+  heap()->map_space()->MarkAllocationInfoBlack();
+  heap()->code_space()->MarkAllocationInfoBlack();
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Black allocation started\n");
   }
 }
 
 void IncrementalMarking::FinishBlackAllocation() {
   if (black_allocation_) {
     black_allocation_ = false;
     if (FLAG_trace_incremental_marking) {
       PrintF("[IncrementalMarking] Black allocation finished\n");
@@ skipping 207 matching lines @@
     // Only pointers to from space have to be updated.
     if (heap_->InFromSpace(obj)) {
       MapWord map_word = obj->map_word();
       // There may be objects on the marking deque that do not exist anymore,
       // e.g. left trimmed objects or objects from the root set (frames).
       // If these object are dead at scavenging time, their marking deque
       // entries will not point to forwarding addresses. Hence, we can discard
       // them.
       if (map_word.IsForwardingAddress()) {
         HeapObject* dest = map_word.ToForwardingAddress();
-        if (Page::FromAddress(dest->address())->IsFlagSet(Page::BLACK_PAGE))
+        if (Marking::IsBlack(ObjectMarking::MarkBitFrom(dest->address())))
           continue;
         array[new_top] = dest;
         new_top = ((new_top + 1) & mask);
         DCHECK(new_top != marking_deque->bottom());
 #ifdef DEBUG
         MarkBit mark_bit = ObjectMarking::MarkBitFrom(obj);
         DCHECK(Marking::IsGrey(mark_bit) ||
                (obj->IsFiller() && Marking::IsWhite(mark_bit)));
 #endif
       }
@@ skipping 431 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }  // namespace internal
 }  // namespace v8