Add a host parameter to ObjectVisitor methods.

src/snapshot/serializer.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_H_
 #define V8_SNAPSHOT_SERIALIZER_H_
 
 #include "src/isolate.h"
 #include "src/log.h"
 #include "src/objects.h"
@@ skipping 263 matching lines @@
                    WhereToPoint where_to_point)
       : serializer_(serializer),
         object_(obj),
         sink_(sink),
         reference_representation_(how_to_code + where_to_point),
         bytes_processed_so_far_(0),
         code_has_been_output_(false) {}
   ~ObjectSerializer() override {}
   void Serialize();
   void SerializeDeferred();
-  void VisitPointers(Object** start, Object** end) override;
-  void VisitEmbeddedPointer(RelocInfo* target) override;
-  void VisitExternalReference(Address* p) override;
-  void VisitExternalReference(RelocInfo* rinfo) override;
-  void VisitInternalReference(RelocInfo* rinfo) override;
-  void VisitCodeTarget(RelocInfo* target) override;
-  void VisitCodeEntry(Address entry_address) override;
-  void VisitCell(RelocInfo* rinfo) override;
-  void VisitRuntimeEntry(RelocInfo* reloc) override;
+  void VisitPointers(HeapObject* host, Object** start, Object** end) override;
+  void VisitEmbeddedPointer(Code* host, RelocInfo* target) override;
+  void VisitExternalReference(Foreign* host, Address* p) override;
+  void VisitExternalReference(Code* host, RelocInfo* rinfo) override;
+  void VisitInternalReference(Code* host, RelocInfo* rinfo) override;
+  void VisitCodeTarget(Code* host, RelocInfo* target) override;
+  void VisitCodeEntry(JSFunction* host, Address entry_address) override;
+  void VisitCell(Code* host, RelocInfo* rinfo) override;
+  void VisitRuntimeEntry(Code* host, RelocInfo* reloc) override;
 
  private:
   bool TryEncodeDeoptimizationEntry(HowToCode how_to_code, Address target,
                                     int skip);
   void SerializePrologue(AllocationSpace space, int size, Map* map);
 
 
   enum ReturnSkip { kCanReturnSkipInsteadOfSkipping, kIgnoringReturn };
   // This function outputs or skips the raw data between the last pointer and
   // up to the current position.  It optionally can just return the number of
@@ skipping 14 matching lines @@
   SnapshotByteSink* sink_;
   int reference_representation_;
   int bytes_processed_so_far_;
   bool code_has_been_output_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SERIALIZER_H_