Implement Fast Accessor Builder

test/cctest/test-api-fast-accessor-builder.cc

+// Copyright 2015 the V8 project authors. All rights reserved.

[epertoso, 2015/11/25 10:31:16]

Could you actually merge this test with test-api-accessors?
Or, even better, you can just test the builder here, and use it in
test-api-accessors.cc.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// TODO(jochen): Remove this after the setting is turned on globally.
+#define V8_IMMINENT_DEPRECATION_WARNINGS
+
+#include <stdlib.h>
+
+#include "src/v8.h"
+
+#include "src/api.h"
+#include "test/cctest/cctest.h"
+
+namespace {
+
+static void NativePropertyAccessor(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(v8_num(123));
+}
+
+}  // anonymous namespace
+
+TEST(FastAccessor) {
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  v8::Local<v8::FunctionTemplate> foo = v8::FunctionTemplate::New(isolate);
+
+  // Native accessor, bar, returns 123.
+  foo->PrototypeTemplate()->SetAccessorProperty(
+      v8_str("bar"),
+      v8::FunctionTemplate::New(isolate, NativePropertyAccessor));
+
+  // Fast accessor, barf, returns 124.
+  auto fab = v8::experimental::FastAccessorBuilder::New(isolate);
+  fab->ReturnValue(fab->IntegerConstant(124));
+  foo->PrototypeTemplate()->SetAccessorProperty(
+      v8_str("barf"), v8::FunctionTemplate::NewWithFastHandler(
+                          isolate, NativePropertyAccessor, fab));
+
+  // Install foo on the global object.
+  CHECK(env->Global()
+            ->Set(env.local(), v8_str("foo"),
+                  foo->GetFunction(env.local()).ToLocalChecked())
+            .FromJust());
+
+  ExpectInt32("f = new foo(); f.bar", 123);
+  ExpectInt32("f = new foo(); f.barf", 123);
+  ExpectInt32("f = new foo(); f.barf", 123);
+  ExpectInt32("f = new foo(); f.barf", 123);
+  ExpectInt32("f = new foo(); f.barf", 124);
+}