Avoid manual object's body traversal in GC.

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1472 matching lines @@
   RELEASE_WRITE_FIELD(
       this, kMapOffset, reinterpret_cast<Object*>(map_word.value_));
 }
 
 
 int HeapObject::Size() {
   return SizeFromMap(map());
 }
 
 
-HeapObjectContents HeapObject::ContentType() {
-  InstanceType type = map()->instance_type();
-  if (type <= LAST_NAME_TYPE) {
-    if (type == SYMBOL_TYPE) {
-      return HeapObjectContents::kTaggedValues;
-    }
-    DCHECK(type < FIRST_NONSTRING_TYPE);
-    // There are four string representations: sequential strings, external
-    // strings, cons strings, and sliced strings.
-    // Only the former two contain raw values and no heap pointers (besides the
-    // map-word).
-    if (((type & kIsIndirectStringMask) != kIsIndirectStringTag))
-      return HeapObjectContents::kRawValues;
-    else
-      return HeapObjectContents::kTaggedValues;
-#if 0
-  // TODO(jochen): Enable eventually.
-  } else if (type == JS_FUNCTION_TYPE) {
-    return HeapObjectContents::kMixedValues;
-#endif
-  } else if (type == BYTECODE_ARRAY_TYPE) {
-    return HeapObjectContents::kMixedValues;
-  } else if (type >= FIRST_FIXED_TYPED_ARRAY_TYPE &&
-             type <= LAST_FIXED_TYPED_ARRAY_TYPE) {
-    return HeapObjectContents::kMixedValues;
-  } else if (type == JS_ARRAY_BUFFER_TYPE) {
-    return HeapObjectContents::kMixedValues;
-  } else if (type <= LAST_DATA_TYPE) {
-    // TODO(jochen): Why do we claim that Code and Map contain only raw values?
-    return HeapObjectContents::kRawValues;
-  } else {
-    if (FLAG_unbox_double_fields) {
-      LayoutDescriptorHelper helper(map());
-      if (!helper.all_fields_tagged()) return HeapObjectContents::kMixedValues;
-    }
-    return HeapObjectContents::kTaggedValues;
-  }
-}
-
-
 double HeapNumber::value() const {
   return READ_DOUBLE_FIELD(this, kValueOffset);
 }
 
 
 void HeapNumber::set_value(double value) {
   WRITE_DOUBLE_FIELD(this, kValueOffset, value);
 }
 
 
@@ skipping 6379 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_