Make heap serialization nondestructive.

test/cctest/test-serialize.cc

 // Copyright 2007-2008 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 174 matching lines @@
 
 
 // Test that the whole heap can be serialized.
 TEST(Serialize) {
   Serializer::Enable();
   v8::V8::Initialize();
   Serialize();
 }
 
 
+// Test that heap serialization is non-destructive.
+TEST(SerializeTwice) {
+  Serializer::Enable();
+  v8::V8::Initialize();
+  Serialize();
+  Serialize();
+}
+
+
 //----------------------------------------------------------------------------
 // Tests that the heap can be deserialized.
 
 static void Deserialize() {
   CHECK(Snapshot::Initialize(FLAG_testing_serialization_file));
 }
 
 
 static void SanityCheck() {
   v8::HandleScope scope;
 #ifdef DEBUG
   Heap::Verify();
 #endif
   CHECK(Top::global()->IsJSObject());
   CHECK(Top::global_context()->IsContext());
   CHECK(Top::special_function_table()->IsFixedArray());
   CHECK(Heap::symbol_table()->IsSymbolTable());
   CHECK(!Factory::LookupAsciiSymbol("Empty")->IsFailure());
 }
 
 
 DEPENDENT_TEST(Deserialize, Serialize) {
   v8::HandleScope scope;
 
   Deserialize();
 
-  fflush(stdout);
-
   v8::Persistent<v8::Context> env = v8::Context::New();
   env->Enter();
 
+  SanityCheck();
+}
+
+
+DEPENDENT_TEST(DeserializeFromSecondSerialization, SerializeTwice) {
+  v8::HandleScope scope;
+
+  Deserialize();
+
+  v8::Persistent<v8::Context> env = v8::Context::New();
+  env->Enter();
+
   SanityCheck();
 }
 
 
 DEPENDENT_TEST(DeserializeAndRunScript2, Serialize) {
   v8::HandleScope scope;
 
   Deserialize();
 
   v8::Persistent<v8::Context> env = v8::Context::New();
   env->Enter();
 
   const char* c_source = "\"1234\".length";
   v8::Local<v8::String> source = v8::String::New(c_source);
   v8::Local<v8::Script> script = v8::Script::Compile(source);
   CHECK_EQ(4, script->Run()->Int32Value());
 }
 
 
+DEPENDENT_TEST(DeserializeFromSecondSerializationAndRunScript2,
+               SerializeTwice) {
+  v8::HandleScope scope;
+
+  Deserialize();
+
+  v8::Persistent<v8::Context> env = v8::Context::New();
+  env->Enter();
+
+  const char* c_source = "\"1234\".length";
+  v8::Local<v8::String> source = v8::String::New(c_source);
+  v8::Local<v8::Script> script = v8::Script::Compile(source);
+  CHECK_EQ(4, script->Run()->Int32Value());
+}
+
+
 TEST(TestThatAlwaysSucceeds) {
 }
 
 
 TEST(TestThatAlwaysFails) {
   bool ArtificialFailure = false;
   CHECK(ArtificialFailure);
 }
 
 
 DEPENDENT_TEST(DependentTestThatAlwaysFails, TestThatAlwaysSucceeds) {
   bool ArtificialFailure2 = false;
   CHECK(ArtificialFailure2);
 }