Fix memory leaks in ~Zone and ~Isolate

src/serialize.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 42 matching lines @@
 const int kTypeCodeCount = STUB_CACHE_TABLE + 1;
 const int kFirstTypeCode = UNCLASSIFIED;
 
 const int kReferenceIdBits = 16;
 const int kReferenceIdMask = (1 << kReferenceIdBits) - 1;
 const int kReferenceTypeShift = kReferenceIdBits;
 const int kDebugRegisterBits = 4;
 const int kDebugIdShift = kDebugRegisterBits;
 
 
+// ExternalReferenceTable is a helper class that defines the relationship
+// between external references and their encodings. It is used to build
+// hashmaps in ExternalReferenceEncoder and ExternalReferenceDecoder.
+class ExternalReferenceTable {
+ public:
+  static ExternalReferenceTable* instance(Isolate* isolate);
+
+  ~ExternalReferenceTable() { }
+
+  int size() const { return refs_.length(); }
+
+  Address address(int i) { return refs_[i].address; }
+
+  uint32_t code(int i) { return refs_[i].code; }
+
+  const char* name(int i) { return refs_[i].name; }
+
+  int max_id(int code) { return max_id_[code]; }
+
+ private:
+  explicit ExternalReferenceTable(Isolate* isolate) : refs_(64) {
+      PopulateTable(isolate);
+  }
+
+  struct ExternalReferenceEntry {
+    Address address;
+    uint32_t code;
+    const char* name;
+  };
+
+  void PopulateTable(Isolate* isolate);
+
+  // For a few types of references, we can get their address from their id.
+  void AddFromId(TypeCode type,
+                 uint16_t id,
+                 const char* name,
+                 Isolate* isolate);
+
+  // For other types of references, the caller will figure out the address.
+  void Add(Address address, TypeCode type, uint16_t id, const char* name);
+
+  List<ExternalReferenceEntry> refs_;
+  int max_id_[kTypeCodeCount];
+};
+
+
 class ExternalReferenceEncoder {
  public:
   ExternalReferenceEncoder();
 
   uint32_t Encode(Address key) const;
 
   const char* NameOfAddress(Address key) const;
 
  private:
   HashMap encodings_;
@@ skipping 508 matching lines @@
   virtual int RootIndex(HeapObject* o) { return kInvalidRootIndex; }
   virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) {
     return false;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_