Factor out handling of mixed objects preprocessing after migration

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 1511 matching lines @@
 Address HeapObject::address() {
   return reinterpret_cast<Address>(this) - kHeapObjectTag;
 }
 
 
 int HeapObject::Size() {
   return SizeFromMap(map());
 }
 
 
-bool HeapObject::MayContainRawValues() {
+HeapObjectContents HeapObject::ContentType() {
   InstanceType type = map()->instance_type();
   if (type <= LAST_NAME_TYPE) {
     if (type == SYMBOL_TYPE) {
-      return false;
+      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).
-    return ((type & kIsIndirectStringMask) != kIsIndirectStringTag);
+    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 <= 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;
   }
-  return (type <= LAST_DATA_TYPE);
 }
 
 
 void HeapObject::IteratePointers(ObjectVisitor* v, int start, int end) {
   v->VisitPointers(reinterpret_cast<Object**>(FIELD_ADDR(this, start)),
                    reinterpret_cast<Object**>(FIELD_ADDR(this, end)));
 }
 
 
 void HeapObject::IteratePointer(ObjectVisitor* v, int offset) {
@@ skipping 5803 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_