Revert of Serializer: support all alignment kinds.

src/heap/heap.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/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 3084 matching lines @@
 AllocationResult Heap::AllocateWeakCell(HeapObject* value) {
   int size = WeakCell::kSize;
   STATIC_ASSERT(WeakCell::kSize <= Page::kMaxRegularHeapObjectSize);
   HeapObject* result = NULL;
   {
     AllocationResult allocation = AllocateRaw(size, OLD_SPACE, OLD_SPACE);
     if (!allocation.To(&result)) return allocation;
   }
   result->set_map_no_write_barrier(weak_cell_map());
   WeakCell::cast(result)->initialize(value);
-  WeakCell::cast(result)->set_next(the_hole_value(), SKIP_WRITE_BARRIER);
+  WeakCell::cast(result)->set_next(undefined_value(), SKIP_WRITE_BARRIER);
   return result;
 }
 
 
 void Heap::CreateApiObjects() {
   HandleScope scope(isolate());
   Factory* factory = isolate()->factory();
   Handle<Map> new_neander_map =
       factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
 
@@ skipping 583 matching lines @@
 
   result->set_map_no_write_barrier(byte_array_map());
   ByteArray::cast(result)->set_length(length);
   return result;
 }
 
 
 void Heap::CreateFillerObjectAt(Address addr, int size) {
   if (size == 0) return;
   HeapObject* filler = HeapObject::FromAddress(addr);
+  // At this point, we may be deserializing the heap from a snapshot, and
+  // none of the maps have been created yet and are NULL.
   if (size == kPointerSize) {
     filler->set_map_no_write_barrier(raw_unchecked_one_pointer_filler_map());
+    DCHECK(filler->map() == NULL || filler->map() == one_pointer_filler_map());
   } else if (size == 2 * kPointerSize) {
     filler->set_map_no_write_barrier(raw_unchecked_two_pointer_filler_map());
+    DCHECK(filler->map() == NULL || filler->map() == two_pointer_filler_map());
   } else {
     filler->set_map_no_write_barrier(raw_unchecked_free_space_map());
+    DCHECK(filler->map() == NULL || filler->map() == free_space_map());
     FreeSpace::cast(filler)->nobarrier_set_size(size);
   }
-  // At this point, we may be deserializing the heap from a snapshot, and
-  // none of the maps have been created yet and are NULL.
-  DCHECK(filler->map() == NULL && !deserialization_complete_ ||
-         filler->map()->IsMap());
 }
 
 
 bool Heap::CanMoveObjectStart(HeapObject* object) {
   Address address = object->address();
 
   if (lo_space()->Contains(object)) return false;
 
   Page* page = Page::FromAddress(address);
   // We can move the object start if:
@@ skipping 3056 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8