lazy instantiation of the default isolate

src/v8.h

 // Copyright 2011 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 63 matching lines @@
 
 class V8 : public AllStatic {
  public:
   // Global actions.
 
   // If Initialize is called with des == NULL, the initial state is
   // created from scratch. If a non-null Deserializer is given, the
   // initial state is created by reading the deserialized data into an
   // empty heap.
   static bool Initialize(Deserializer* des);
-  static void TearDown();
+  static bool TearDown();
 
   // Report process out of memory. Implementation found in api.cc.
   static void FatalProcessOutOfMemory(const char* location,
                                       bool take_snapshot = false);
 
   // Allows an entropy source to be provided for use in random number
   // generation.
   static void SetEntropySource(EntropySource source);
   // Support for return-address rewriting profilers.
   static void SetReturnAddressLocationResolver(
@@ skipping 31 matching lines @@
 
 // JavaScript defines two kinds of 'nil'.
 enum NilValue { kNullValue, kUndefinedValue };
 
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_V8_H_