Add IsGeneratorFunction and IsGeneratorObject checks to v8::Value.

R=ulan@chromium.org, yangguo@chromium.org, wingo, yangguo

Review URL: https://codereview.chromium.org/608503002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24278 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -1560,6 +1560,18 @@ class V8_EXPORT Value : public Data {
    */
   bool IsRegExp() const;
 
+  /**
+   * Returns true if this value is a Generator function.
+   * This is an experimental feature.
+   */
+  bool IsGeneratorFunction() const;
+
+  /**
+   * Returns true if this value is a Generator object (iterator).
+   * This is an experimental feature.
+   */
+  bool IsGeneratorObject() const;
+
   /**
    * Returns true if this value is a Promise.
    * This is an experimental feature.

src/api.cc

@@ -2568,6 +2568,19 @@ bool Value::IsRegExp() const {
 }
 
 
+bool Value::IsGeneratorFunction() const {
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  if (!obj->IsJSFunction()) return false;
+  i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(obj);
+  return func->shared()->is_generator();
+}
+
+
+bool Value::IsGeneratorObject() const {
+  return Utils::OpenHandle(this)->IsJSGeneratorObject();
+}
+
+
 Local<String> Value::ToString() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;

test/cctest/test-api.cc

@@ -1589,6 +1589,34 @@ THREADED_TEST(IsNativeError) {
 }
 
 
+THREADED_TEST(IsGeneratorFunctionOrObject) {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+
+  CompileRun("function *gen() { yield 1; }\nfunction func() {}");
+  v8::Handle<Value> gen = CompileRun("gen");
+  v8::Handle<Value> genObj = CompileRun("gen()");
+  v8::Handle<Value> object = CompileRun("{a:42}");
+  v8::Handle<Value> func = CompileRun("func");
+
+  CHECK(gen->IsGeneratorFunction());
+  CHECK(gen->IsFunction());
+  CHECK(!gen->IsGeneratorObject());
+
+  CHECK(!genObj->IsGeneratorFunction());
+  CHECK(!genObj->IsFunction());
+  CHECK(genObj->IsGeneratorObject());
+
+  CHECK(!object->IsGeneratorFunction());
+  CHECK(!object->IsFunction());
+  CHECK(!object->IsGeneratorObject());
+
+  CHECK(!func->IsGeneratorFunction());
+  CHECK(func->IsFunction());
+  CHECK(!func->IsGeneratorObject());
+}
+
+
 THREADED_TEST(ArgumentsObject) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());