Add GetIdentityHash to v8::Name object API

test/cctest/test-api.cc

 // Copyright 2012 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 3015 matching lines @@
   CHECK_EQ(hash1, hash2);
   {
     // Re-attach global proxy to a new context, hash should stay the same.
     LocalContext env2(NULL, Handle<ObjectTemplate>(), global_proxy);
     int hash3 = global_proxy->GetIdentityHash();
     CHECK_EQ(hash1, hash3);
   }
 }
 
 
+TEST(SymbolIdentityHash) {
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  {
+    Local<v8::Symbol> symbol = v8::Symbol::New(isolate);
+    int hash = symbol->GetIdentityHash();
+    int hash1 = symbol->GetIdentityHash();
+    CHECK_EQ(hash, hash1);
+    CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
+    int hash3 = symbol->GetIdentityHash();
+    CHECK_EQ(hash, hash3);
+  }
+
+  {
+    v8::Handle<v8::Symbol> js_symbol =
+        CompileRun("Symbol('foo')").As<v8::Symbol>();
+    int hash = js_symbol->GetIdentityHash();
+    int hash1 = js_symbol->GetIdentityHash();
+    CHECK_EQ(hash, hash1);
+    CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
+    int hash3 = js_symbol->GetIdentityHash();
+    CHECK_EQ(hash, hash3);
+  }
+}
+
+
+TEST(StringIdentityHash) {
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  Local<v8::String> str = v8::String::NewFromUtf8(isolate, "str1");
+  int hash = str->GetIdentityHash();
+  int hash1 = str->GetIdentityHash();
+  CHECK_EQ(hash, hash1);
+  CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
+  int hash3 = str->GetIdentityHash();
+  CHECK_EQ(hash, hash3);
+
+  Local<v8::String> str2 = v8::String::NewFromUtf8(isolate, "str1");
+  int hash4 = str2->GetIdentityHash();
+  CHECK_EQ(hash, hash4);
+}
+
+
 THREADED_TEST(SymbolProperties) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();
   v8::HandleScope scope(isolate);
 
   v8::Local<v8::Object> obj = v8::Object::New(isolate);
   v8::Local<v8::Symbol> sym1 = v8::Symbol::New(isolate);
   v8::Local<v8::Symbol> sym2 =
       v8::Symbol::New(isolate, v8_str("my-symbol"));
   v8::Local<v8::Symbol> sym3 =
@@ skipping 21336 matching lines @@
   v8::HandleScope scope(CcTest::isolate());
   RandomLengthOneByteResource* r =
       new RandomLengthOneByteResource(i::String::kMaxLength);
   v8::Local<v8::String> str = v8::String::NewExternal(CcTest::isolate(), r);
   CHECK(!str.IsEmpty());
   v8::TryCatch try_catch;
   v8::Local<v8::String> result = v8::String::Concat(str, str);
   CHECK(result.IsEmpty());
   CHECK(!try_catch.HasCaught());
 }