Expose SameValue equality comparison algorithm

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 4955 matching lines @@
   CHECK_EQ(v8_num(1), v8_num(1));
   CHECK_EQ(v8_num(1.00), v8_num(1));
   CHECK_NE(v8_num(1), v8_num(2));
 
   // Assume String is not internalized.
   CHECK(v8_str("a")->StrictEquals(v8_str("a")));
   CHECK(!v8_str("a")->StrictEquals(v8_str("b")));
   CHECK(!v8_str("5")->StrictEquals(v8_num(5)));
   CHECK(v8_num(1)->StrictEquals(v8_num(1)));
   CHECK(!v8_num(1)->StrictEquals(v8_num(2)));
-  CHECK(v8_num(0)->StrictEquals(v8_num(-0)));
+  CHECK(v8_num(0.0)->StrictEquals(v8_num(-0.0)));

[yusukesuzuki, 2013/09/24 12:58:26]

Since 0 is int, static_cast<double>(-0) becomes 0.0.

   Local<Value> not_a_number = v8_num(i::OS::nan_value());
   CHECK(!not_a_number->StrictEquals(not_a_number));
   CHECK(v8::False()->StrictEquals(v8::False()));
   CHECK(!v8::False()->StrictEquals(v8::Undefined()));
 
   v8::Handle<v8::Object> obj = v8::Object::New();
   v8::Persistent<v8::Object> alias(isolate, obj);
   CHECK(v8::Local<v8::Object>::New(isolate, alias)->StrictEquals(obj));
   alias.Dispose();
+
+  CHECK(v8_str("a")->SameValue(v8_str("a")));
+  CHECK(!v8_str("a")->SameValue(v8_str("b")));
+  CHECK(!v8_str("5")->SameValue(v8_num(5)));
+  CHECK(v8_num(1)->SameValue(v8_num(1)));
+  CHECK(!v8_num(1)->SameValue(v8_num(2)));
+  CHECK(!v8_num(0.0)->SameValue(v8_num(-0.0)));

[yusukesuzuki, 2013/09/24 12:58:26]

`SameValue(0.0, -0.0)` becomes false.

+  CHECK(not_a_number->SameValue(not_a_number));

[yusukesuzuki, 2013/09/24 12:58:26]

`SameValue(NaN, NaN)` becomes true.

+  CHECK(v8::False()->SameValue(v8::False()));
+  CHECK(!v8::False()->SameValue(v8::Undefined()));
 }
 
 
 THREADED_TEST(MultiRun) {
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Local<Script> script = Script::Compile(v8_str("x"));
   for (int i = 0; i < 10; i++)
     script->Run();
 }
@@ skipping 15571 matching lines @@
   Local<Object> data2 = v8::Object::New();
   function_new_expected_env = data2;
   Local<Function> func2 = Function::New(isolate, FunctionNewCallback, data2);
   CHECK(!func2->IsNull());
   CHECK_NE(func, func2);
   env->Global()->Set(v8_str("func2"), func2);
   Local<Value> result2 = CompileRun("func2();");
   CHECK_EQ(v8::Integer::New(17, isolate), result2);
 }