[serializer] prepare attached references for general use.

src/snapshot/serializer-common.h

 // Copyright 2016 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.
 
 #ifndef V8_SNAPSHOT_SERIALIZER_COMMON_H_
 #define V8_SNAPSHOT_SERIALIZER_COMMON_H_
 
 #include "src/address-map.h"
 #include "src/external-reference-table.h"
 #include "src/globals.h"
@@ skipping 22 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ExternalReferenceEncoder);
 };
 
 class HotObjectsList {
  public:
   HotObjectsList() : index_(0) {
     for (int i = 0; i < kSize; i++) circular_queue_[i] = NULL;
   }
 
   void Add(HeapObject* object) {
+    DCHECK(!AllowHeapAllocation::IsAllowed());
     circular_queue_[index_] = object;
     index_ = (index_ + 1) & kSizeMask;
   }
 
   HeapObject* Get(int index) {
+    DCHECK(!AllowHeapAllocation::IsAllowed());
     DCHECK_NOT_NULL(circular_queue_[index]);
     return circular_queue_[index];
   }
 
   static const int kNotFound = -1;
 
   int Find(HeapObject* object) {
+    DCHECK(!AllowHeapAllocation::IsAllowed());
     for (int i = 0; i < kSize; i++) {
       if (circular_queue_[i] == object) return i;
     }
     return kNotFound;
   }
 
   static const int kSize = 8;
 
  private:
   STATIC_ASSERT(IS_POWER_OF_TWO(kSize));
@@ skipping 139 matching lines @@
   // 0xf0..0xff
   static const int kFixedRepeat = 0xf0;
   static const int kFixedRepeatStart = kFixedRepeat - 1;
 
   // ---------- special values ----------
   static const int kAnyOldSpace = -1;
 
   // Sentinel after a new object to indicate that double alignment is needed.
   static const int kDoubleAlignmentSentinel = 0;
 
-  // Used as index for the attached reference representing the source object.
-  static const int kSourceObjectReference = 0;
-
-  // Used as index for the attached reference representing the global proxy.
-  static const int kGlobalProxyReference = 0;
-
   // ---------- member variable ----------
   HotObjectsList hot_objects_;
 };
 
 class SerializedData {
  public:
   class Reservation {
    public:
     explicit Reservation(uint32_t size)
         : reservation_(ChunkSizeBits::encode(size)) {}
@@ skipping 51 matching lines @@
 
   byte* data_;
   int size_;
   bool owns_data_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SERIALIZER_COMMON_H_