Serializer: serialize internal references via object visitor.

src/serialize.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.
 
 #ifndef V8_SERIALIZE_H_
 #define V8_SERIALIZE_H_
 
 #include "src/hashmap.h"
 #include "src/heap-profiler.h"
 #include "src/isolate.h"
@@ skipping 330 matching lines @@
   };
 
   // Where to point within the object.
   enum WhereToPoint {
     kStartOfObject = 0,
     kInnerPointer = 0x80,  // First insn in code object or payload of cell.
     kWhereToPointMask = 0x80
   };
 
   // Misc.
+
+  // 0x48, 0x88 and 0xc8 are unused.
+
   // Raw data to be copied from the snapshot.  This byte code does not advance
   // the current pointer, which is used for code objects, where we write the
   // entire code in one memcpy, then fix up stuff with kSkip and other byte
   // codes that overwrite data.
   static const int kRawData = 0x20;
   // Some common raw lengths: 0x21-0x3f.
   // These autoadvance the current pointer.
   static const int kOnePointerRawData = 0x21;
 
+  // Internal reference encoded as offsets of pc and target from code entry.
+  static const int kInternalReference = 0x08;
+
   static const int kVariableRepeat = 0x60;
   // 0x61-0x6f   Repeat last word
   static const int kFixedRepeat = 0x61;
   static const int kFixedRepeatBase = kFixedRepeat - 1;
   static const int kLastFixedRepeat = 0x6f;
   static const int kMaxFixedRepeats = kLastFixedRepeat - kFixedRepeatBase;
   static int CodeForRepeats(int repeats) {
     DCHECK(repeats >= 1 && repeats <= kMaxFixedRepeats);
     return kFixedRepeatBase + repeats;
   }
@@ skipping 234 matching lines @@
   void EncodeReservations(List<SerializedData::Reservation>* out) const;
 
   Isolate* isolate() const { return isolate_; }
 
   BackReferenceMap* back_reference_map() { return &back_reference_map_; }
   RootIndexMap* root_index_map() { return &root_index_map_; }
 
  protected:
   class ObjectSerializer : public ObjectVisitor {
    public:
-    ObjectSerializer(Serializer* serializer,
-                     Object* o,
-                     SnapshotByteSink* sink,
-                     HowToCode how_to_code,
-                     WhereToPoint where_to_point)
-      : serializer_(serializer),
-        object_(HeapObject::cast(o)),
-        sink_(sink),
-        reference_representation_(how_to_code + where_to_point),
-        bytes_processed_so_far_(0),
-        code_object_(o->IsCode()),
-        code_has_been_output_(false) { }
+    ObjectSerializer(Serializer* serializer, Object* o, SnapshotByteSink* sink,
+                     HowToCode how_to_code, WhereToPoint where_to_point)
+        : serializer_(serializer),
+          object_(HeapObject::cast(o)),
+          sink_(sink),
+          reference_representation_(how_to_code + where_to_point),
+          bytes_processed_so_far_(0),
+          is_code_object_(o->IsCode()),
+          code_has_been_output_(false) {}
     void Serialize();
     void VisitPointers(Object** start, Object** end);
     void VisitEmbeddedPointer(RelocInfo* target);
     void VisitExternalReference(Address* p);
     void VisitExternalReference(RelocInfo* rinfo);
+    void VisitInternalReference(RelocInfo* rinfo);
     void VisitCodeTarget(RelocInfo* target);
     void VisitCodeEntry(Address entry_address);
     void VisitCell(RelocInfo* rinfo);
     void VisitRuntimeEntry(RelocInfo* reloc);
     // Used for seralizing the external strings that hold the natives source.
     void VisitExternalOneByteString(
         v8::String::ExternalOneByteStringResource** resource);
     // We can't serialize a heap with external two byte strings.
     void VisitExternalTwoByteString(
         v8::String::ExternalStringResource** resource) {
@@ skipping 12 matching lines @@
     // External strings are serialized in a way to resemble sequential strings.
     void SerializeExternalString();
 
     Address PrepareCode();
 
     Serializer* serializer_;
     HeapObject* object_;
     SnapshotByteSink* sink_;
     int reference_representation_;
     int bytes_processed_so_far_;
-    bool code_object_;
+    bool is_code_object_;
     bool code_has_been_output_;
   };
 
   virtual void SerializeObject(HeapObject* o, HowToCode how_to_code,
                                WhereToPoint where_to_point, int skip) = 0;
 
   void PutRoot(int index, HeapObject* object, HowToCode how, WhereToPoint where,
                int skip);
 
   // Returns true if the object was successfully serialized.
@@ skipping 297 matching lines @@
       kNumInternalizedStringsOffset + kInt32Size;
   static const int kNumCodeStubKeysOffset = kNumReservationsOffset + kInt32Size;
   static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
   static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
   static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
   static const int kHeaderSize = kChecksum2Offset + kInt32Size;
 };
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_