Don't record slots of objects that may contain raw values.

src/heap/mark-compact.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/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 2880 matching lines @@
   if (dest == OLD_POINTER_SPACE) {
     Address src_slot = src_addr;
     Address dst_slot = dst_addr;
     DCHECK(IsAligned(size, kPointerSize));
 
     for (int remaining = size / kPointerSize; remaining > 0; remaining--) {
       Object* value = Memory::Object_at(src_slot);
 
       Memory::Object_at(dst_slot) = value;
 
-      // We special case ConstantPoolArrays below since they could contain
-      // integers value entries which look like tagged pointers.
-      // TODO(mstarzinger): restructure this code to avoid this special-casing.
-      if (!src->IsConstantPoolArray()) {
+      if (!src->MayContainRawValues()) {
         RecordMigratedSlot(value, dst_slot);
       }
 
       src_slot += kPointerSize;
       dst_slot += kPointerSize;
     }
 
     if (compacting_ && dst->IsJSFunction()) {
       Address code_entry_slot = dst_addr + JSFunction::kCodeEntryOffset;
       Address code_entry = Memory::Address_at(code_entry_slot);
 
       if (Page::FromAddress(code_entry)->IsEvacuationCandidate()) {
         SlotsBuffer::AddTo(&slots_buffer_allocator_, &migration_slots_buffer_,
                            SlotsBuffer::CODE_ENTRY_SLOT, code_entry_slot,
                            SlotsBuffer::IGNORE_OVERFLOW);
       }
     } else if (dst->IsConstantPoolArray()) {
+      // We special case ConstantPoolArrays since they could contain integers
+      // value entries which look like tagged pointers.
+      // TODO(mstarzinger): restructure this code to avoid this special-casing.
       ConstantPoolArray* array = ConstantPoolArray::cast(dst);
       ConstantPoolArray::Iterator code_iter(array, ConstantPoolArray::CODE_PTR);
       while (!code_iter.is_finished()) {
         Address code_entry_slot =
             dst_addr + array->OffsetOfElementAt(code_iter.next_index());
         Address code_entry = Memory::Address_at(code_entry_slot);
 
         if (Page::FromAddress(code_entry)->IsEvacuationCandidate()) {
           SlotsBuffer::AddTo(&slots_buffer_allocator_, &migration_slots_buffer_,
                              SlotsBuffer::CODE_ENTRY_SLOT, code_entry_slot,
@@ skipping 1621 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal