implement fast ReturnValue setters

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 992 matching lines @@
 }
 
 
 THREADED_TEST(SimpleCallback) {
   TestSimpleCallback(SimpleDirectCallback);
   TestSimpleCallback(SimpleIndirectCallback);
   TestSimpleCallback(SimpleCallback);
 }
 
 
+template<typename T>
+void FastReturnValueCallback(const v8::FunctionCallbackInfo<v8::Value>& info);
+
+// constant return values
+static const int32_t kFastReturnValueInt32 = 471;
+static const uint32_t kFastReturnValueUint32 = 571;
+static const double kFastReturnValueDouble = 2.7;
+// variable return values
+static bool fast_return_value_bool = false;
+static bool fast_return_value_void_is_null = false;
+
+template<>
+void FastReturnValueCallback<int32_t>(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(info.GetIsolate(), kFastReturnValueInt32);
+}
+
+template<>
+void FastReturnValueCallback<uint32_t>(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(info.GetIsolate(), kFastReturnValueUint32);
+}
+
+template<>
+void FastReturnValueCallback<double>(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(info.GetIsolate(), kFastReturnValueDouble);
+}
+
+template<>
+void FastReturnValueCallback<bool>(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(info.GetIsolate(), fast_return_value_bool);
+}
+
+template<>
+void FastReturnValueCallback<void>(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  if (fast_return_value_void_is_null) {
+    info.GetReturnValue().SetNull(info.GetIsolate());
+  } else {
+    info.GetReturnValue().SetUndefined(info.GetIsolate());
+  }
+}
+
+template<typename T>
+Handle<Value> TestFastReturnValues() {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+  v8::Handle<v8::ObjectTemplate> object_template = v8::ObjectTemplate::New();
+  v8::FunctionCallback callback = &FastReturnValueCallback<T>;
+  object_template->Set("callback", v8::FunctionTemplate::New(callback));
+  v8::Local<v8::Object> object = object_template->NewInstance();
+  (*env)->Global()->Set(v8_str("callback_object"), object);
+  return scope.Close(CompileRun("callback_object.callback()"));
+}
+
+THREADED_TEST(FastReturnValues) {
+  v8::HandleScope scope(v8::Isolate::GetCurrent());
+  v8::Handle<v8::Value> value;
+  // check int_32
+  value = TestFastReturnValues<int32_t>();
+  CHECK(value->IsInt32());
+  CHECK_EQ(kFastReturnValueInt32, value->Int32Value());
+  // check uint32_t
+  value = TestFastReturnValues<uint32_t>();
+  CHECK(value->IsInt32());
+  CHECK_EQ(kFastReturnValueUint32, value->Int32Value());
+  // check double
+  value = TestFastReturnValues<double>();
+  CHECK(value->IsNumber());
+  CHECK_EQ(kFastReturnValueDouble, value->ToNumber()->Value());
+  // check bool values
+  for (int i = 0; i < 2; i++) {
+    fast_return_value_bool = i == 0;
+    value = TestFastReturnValues<bool>();
+    CHECK(value->IsBoolean());
+    CHECK_EQ(fast_return_value_bool, value->ToBoolean()->Value());
+  }
+  // check oddballs
+  for (int i = 0; i < 2; i++) {
+    fast_return_value_void_is_null = i == 0;
+    value = TestFastReturnValues<void>();
+    if (fast_return_value_void_is_null) {
+      CHECK(value->IsNull());
+    } else {
+      CHECK(value->IsUndefined());
+    }
+  }
+}
+
+
 THREADED_TEST(FunctionTemplateSetLength) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   {
     Local<v8::FunctionTemplate> fun_templ = v8::FunctionTemplate::New(
         handle_call, Handle<v8::Value>(), Handle<v8::Signature>(), 23);
     Local<Function> fun = fun_templ->GetFunction();
     env->Global()->Set(v8_str("obj"), fun);
     Local<Script> script = v8_compile("obj.length");
     CHECK_EQ(23, script->Run()->Int32Value());
@@ skipping 18137 matching lines @@
   i::Semaphore* sem_;
   volatile int sem_value_;
 };
 
 
 THREADED_TEST(SemaphoreInterruption) {
   ThreadInterruptTest().RunTest();
 }
 
 #endif  // WIN32