Support compaction for code space pages.

src/objects-inl.h

 // 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 3548 matching lines @@
 }
 
 
 Code* JSFunction::unchecked_code() {
   return reinterpret_cast<Code*>(
       Code::GetObjectFromEntryAddress(FIELD_ADDR(this, kCodeEntryOffset)));
 }
 
 
 void JSFunction::set_code(Code* value) {
-  // Skip the write barrier because code is never in new space.
   ASSERT(!HEAP->InNewSpace(value));
   Address entry = value->entry();
   WRITE_INTPTR_FIELD(this, kCodeEntryOffset, reinterpret_cast<intptr_t>(entry));
-  GetHeap()->incremental_marking()->RecordWrite(
+  GetHeap()->incremental_marking()->RecordWriteOfCodeEntry(
       this,
       HeapObject::RawField(this, kCodeEntryOffset),
       value);
 }
 
 
 void JSFunction::ReplaceCode(Code* code) {
   bool was_optimized = IsOptimized();
   bool is_optimized = code->kind() == Code::OPTIMIZED_FUNCTION;
 
@@ skipping 890 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_