[heap] Remove unused IntrusiveMarking class.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1278113004

Cr-Commit-Position: refs/heads/master@{#30068}

src/heap/heap.cc

@@ -113,7 +113,6 @@ Heap::Heap()
       inline_allocation_disabled_(false),
       store_buffer_rebuilder_(store_buffer()),
       hidden_string_(NULL),
-      gc_safe_size_of_old_object_(NULL),
       total_regexp_code_generated_(0),
       tracer_(this),
       high_survival_rate_period_length_(0),
@@ -247,14 +246,6 @@ bool Heap::HasBeenSetUp() {
 }
 
 
-int Heap::GcSafeSizeOfOldObject(HeapObject* object) {
-  if (IntrusiveMarking::IsMarked(object)) {
-    return IntrusiveMarking::SizeOfMarkedObject(object);
-  }
-  return object->SizeFromMap(object->map());
-}
-
-
 GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space,
                                               const char** reason) {
   // Is global GC requested?
@@ -5759,8 +5750,6 @@ bool Heap::SetUp() {
 
   base::CallOnce(&initialize_gc_once, &InitializeGCOnce);
 
-  MarkMapPointersAsEncoded(false);
-
   // Set up memory allocator.
   if (!isolate_->memory_allocator()->SetUp(MaxReserved(), MaxExecutableSize()))
     return false;

src/heap/heap.h

@@ -1007,13 +1007,6 @@ class Heap {
     roots_[kCodeStubsRootIndex] = value;
   }
 
-  // Support for computing object sizes for old objects during GCs. Returns
-  // a function that is guaranteed to be safe for computing object sizes in
-  // the current GC phase.
-  HeapObjectCallback GcSafeSizeOfOldObjectFunction() {
-    return gc_safe_size_of_old_object_;
-  }
-
   // Sets the non_monomorphic_cache_ (only used when expanding the dictionary).
   void public_set_non_monomorphic_cache(UnseededNumberDictionary* value) {
     roots_[kNonMonomorphicCacheRootIndex] = value;
@@ -1901,16 +1894,6 @@ class Heap {
   };
   List<GCEpilogueCallbackPair> gc_epilogue_callbacks_;
 
-  // Support for computing object sizes during GC.
-  HeapObjectCallback gc_safe_size_of_old_object_;
-  static int GcSafeSizeOfOldObject(HeapObject* object);
-
-  // Update the GC state. Called from the mark-compact collector.
-  void MarkMapPointersAsEncoded(bool encoded) {
-    DCHECK(!encoded);
-    gc_safe_size_of_old_object_ = &GcSafeSizeOfOldObject;
-  }
-
   // Code that should be run before and after each GC.  Includes some
   // reporting/verification activities when compiled with DEBUG set.
   void GarbageCollectionPrologue();
@@ -2749,46 +2732,6 @@ class WeakObjectRetainer {
 };
 
 
-// Intrusive object marking uses least significant bit of
-// heap object's map word to mark objects.
-// Normally all map words have least significant bit set
-// because they contain tagged map pointer.
-// If the bit is not set object is marked.
-// All objects should be unmarked before resuming
-// JavaScript execution.
-class IntrusiveMarking {
- public:
-  static bool IsMarked(HeapObject* object) {
-    return (object->map_word().ToRawValue() & kNotMarkedBit) == 0;
-  }
-
-  static void ClearMark(HeapObject* object) {
-    uintptr_t map_word = object->map_word().ToRawValue();
-    object->set_map_word(MapWord::FromRawValue(map_word | kNotMarkedBit));
-    DCHECK(!IsMarked(object));
-  }
-
-  static void SetMark(HeapObject* object) {
-    uintptr_t map_word = object->map_word().ToRawValue();
-    object->set_map_word(MapWord::FromRawValue(map_word & ~kNotMarkedBit));
-    DCHECK(IsMarked(object));
-  }
-
-  static Map* MapOfMarkedObject(HeapObject* object) {
-    uintptr_t map_word = object->map_word().ToRawValue();
-    return MapWord::FromRawValue(map_word | kNotMarkedBit).ToMap();
-  }
-
-  static int SizeOfMarkedObject(HeapObject* object) {
-    return object->SizeFromMap(MapOfMarkedObject(object));
-  }
-
- private:
-  static const uintptr_t kNotMarkedBit = 0x1;
-  STATIC_ASSERT((kHeapObjectTag & kNotMarkedBit) != 0);  // NOLINT
-};
-
-
 #ifdef DEBUG
 // Helper class for tracing paths to a search target Object from all roots.
 // The TracePathFrom() method can be used to trace paths from a specific

src/heap/spaces.cc

@@ -3140,14 +3140,14 @@ void Page::Print() {
   PrintF("Page@%p in %s\n", this->address(),
          AllocationSpaceName(this->owner()->identity()));
   printf(" --------------------------------------\n");
-  HeapObjectIterator objects(this, heap()->GcSafeSizeOfOldObjectFunction());
+  HeapObjectIterator objects(this, nullptr);
   unsigned mark_size = 0;
   for (HeapObject* object = objects.Next(); object != NULL;
        object = objects.Next()) {
     bool is_marked = Marking::IsBlackOrGrey(Marking::MarkBitFrom(object));
     PrintF(" %c ", (is_marked ? '!' : ' '));  // Indent a little.
     if (is_marked) {
-      mark_size += heap()->GcSafeSizeOfOldObjectFunction()(object);
+      mark_size += object->Size();
     }
     object->ShortPrint();
     PrintF("\n");