[api] Add interceptor for getOwnPropertyDescriptor().

test/cctest/test-api-interceptors.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "test/cctest/test-api.h"
 
 #include "include/v8-util.h"
 #include "src/api.h"
@@ skipping 250 matching lines @@
 void CheckThisIndexedPropertySetter(
     uint32_t index, Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertySetter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()
             ->Equals(info.GetIsolate()->GetCurrentContext(), bottom)
             .FromJust());
 }
 
+void CheckThisIndexedPropertyDescriptor(
+    uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info) {
+  CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertyDescriptor));
+  ApiTestFuzzer::Fuzz();
+  CHECK(info.This()
+            ->Equals(info.GetIsolate()->GetCurrentContext(), bottom)
+            .FromJust());
+}
+
+void CheckThisNamedPropertyDescriptor(
+    Local<Name> property, const v8::PropertyCallbackInfo<v8::Value>& info) {
+  CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertyDescriptor));
+  ApiTestFuzzer::Fuzz();
+  CHECK(info.This()
+            ->Equals(info.GetIsolate()->GetCurrentContext(), bottom)
+            .FromJust());
+}
 
 void CheckThisNamedPropertySetter(
     Local<Name> property, Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertySetter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()
             ->Equals(info.GetIsolate()->GetCurrentContext(), bottom)
             .FromJust());
 }
@@ skipping 934 matching lines @@
             ->Run(env.local())
             .ToLocalChecked()
             ->BooleanValue(env.local())
             .FromJust());
 }
 
 namespace {
 void NotInterceptingPropertyDefineCallback(
     Local<Name> name, const v8::PropertyDescriptor& desc,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
-  // Do not intercept by not calling info.GetReturnValue().Set()
+  // Do not intercept by not calling info.GetReturnValue().Set().
 }
 
 void InterceptingPropertyDefineCallback(
     Local<Name> name, const v8::PropertyDescriptor& desc,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
-  // intercept the callback by setting a non-empty handle
+  // Intercept the callback by setting a non-empty handle
   info.GetReturnValue().Set(name);
 }
 
 void CheckDescriptorInDefineCallback(
     Local<Name> name, const v8::PropertyDescriptor& desc,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CHECK(!desc.has_writable());
   CHECK(!desc.has_value());
   CHECK(!desc.has_enumerable());
   CHECK(desc.has_configurable());
@@ skipping 399 matching lines @@
   const char* code =
       "Object.defineProperty(obj, 'x', {set: function() {return 42;}});"
       "obj.x = 17;";
   CHECK_EQ(17, v8_compile(code)
                    ->Run(env.local())
                    .ToLocalChecked()
                    ->Int32Value(env.local())
                    .FromJust());
 }
 
+namespace {
+void EmptyPropertyDescriptorCallback(
+    Local<Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
+  // Do not intercept by not calling info.GetReturnValue().Set().
+}
+
+void InterceptingPropertyDescriptorCallback(
+    Local<Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
+  // Intercept the callback by setting a different descriptor.
+  const char* code =
+      "var desc = {value: 42};"
+      "desc;";
+  Local<Value> descriptor = v8_compile(code)
+                                ->Run(info.GetIsolate()->GetCurrentContext())
+                                .ToLocalChecked();
+  info.GetReturnValue().Set(descriptor);
+}
+}  // namespace
+
+THREADED_TEST(PropertyDescriptorCallback) {
+  v8::HandleScope scope(CcTest::isolate());
+  LocalContext env;
+
+  {  // Normal behavior of getOwnPropertyDescriptor() with empty callback.
+    v8::Local<v8::FunctionTemplate> templ =
+        v8::FunctionTemplate::New(CcTest::isolate());
+    templ->InstanceTemplate()->SetHandler(v8::NamedPropertyHandlerConfiguration(
+        0, 0, EmptyPropertyDescriptorCallback, 0, 0, 0));
+    env->Global()
+        ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())
+                                              .ToLocalChecked()
+                                              ->NewInstance(env.local())
+                                              .ToLocalChecked())
+        .FromJust();
+    const char* code =
+        "obj.x = 17; "
+        "var desc = Object.getOwnPropertyDescriptor(obj, 'x');"
+        "desc.value;";
+    CHECK_EQ(17, v8_compile(code)
+                     ->Run(env.local())
+                     .ToLocalChecked()
+                     ->Int32Value(env.local())
+                     .FromJust());
+  }
+
+  {  // Intercept getOwnPropertyDescriptor().
+    v8::Local<v8::FunctionTemplate> templ =
+        v8::FunctionTemplate::New(CcTest::isolate());
+    templ->InstanceTemplate()->SetHandler(v8::NamedPropertyHandlerConfiguration(
+        0, 0, InterceptingPropertyDescriptorCallback, 0, 0, 0));
+    env->Global()
+        ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())
+                                              .ToLocalChecked()
+                                              ->NewInstance(env.local())
+                                              .ToLocalChecked())
+        .FromJust();
+    const char* code =
+        "obj.x = 17; "
+        "var desc = Object.getOwnPropertyDescriptor(obj, 'x');"
+        "desc.value;";
+    CHECK_EQ(42, v8_compile(code)
+                     ->Run(env.local())
+                     .ToLocalChecked()
+                     ->Int32Value(env.local())
+                     .FromJust());
+  }
+}
+
 int echo_indexed_call_count = 0;
 
 
 static void EchoIndexedProperty(
     uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK(v8_num(637)
             ->Equals(info.GetIsolate()->GetCurrentContext(), info.Data())
             .FromJust());
   echo_indexed_call_count++;
@@ skipping 21 matching lines @@
                .FromJust(),
            900);
 }
 
 
 THREADED_TEST(PropertyHandlerInPrototype) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();
   v8::HandleScope scope(isolate);
 
-  // Set up a prototype chain with three interceptors.
   v8::Local<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(isolate);
   templ->InstanceTemplate()->SetHandler(v8::IndexedPropertyHandlerConfiguration(
       CheckThisIndexedPropertyHandler, CheckThisIndexedPropertySetter,
       CheckThisIndexedPropertyQuery, CheckThisIndexedPropertyDeleter,
-      CheckThisIndexedPropertyEnumerator, CheckThisIndexedPropertyDefiner));
+      CheckThisIndexedPropertyEnumerator));
 
   templ->InstanceTemplate()->SetHandler(v8::NamedPropertyHandlerConfiguration(
       CheckThisNamedPropertyHandler, CheckThisNamedPropertySetter,
       CheckThisNamedPropertyQuery, CheckThisNamedPropertyDeleter,
-      CheckThisNamedPropertyEnumerator, CheckThisNamedPropertyDefiner));
+      CheckThisNamedPropertyEnumerator));
 
   bottom = templ->GetFunction(env.local())
                .ToLocalChecked()
                ->NewInstance(env.local())
                .ToLocalChecked();
   Local<v8::Object> top = templ->GetFunction(env.local())
                               .ToLocalChecked()
                               ->NewInstance(env.local())
                               .ToLocalChecked();
   Local<v8::Object> middle = templ->GetFunction(env.local())
@@ skipping 16 matching lines @@
   // Indexed and named query.
   CompileRun("0 in obj");
   CompileRun("'x' in obj");
 
   // Indexed and named deleter.
   CompileRun("delete obj[0]");
   CompileRun("delete obj.x");
 
   // Enumerators.
   CompileRun("for (var p in obj) ;");
+}
+
+TEST(PropertyHandlerInPrototypeWithDefine) {
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  v8::Local<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(isolate);
+  templ->InstanceTemplate()->SetHandler(v8::IndexedPropertyHandlerConfiguration(
+      CheckThisIndexedPropertyHandler, CheckThisIndexedPropertySetter,
+      CheckThisIndexedPropertyDescriptor, CheckThisIndexedPropertyDeleter,
+      CheckThisIndexedPropertyEnumerator, CheckThisIndexedPropertyDefiner));
+
+  templ->InstanceTemplate()->SetHandler(v8::NamedPropertyHandlerConfiguration(
+      CheckThisNamedPropertyHandler, CheckThisNamedPropertySetter,
+      CheckThisNamedPropertyDescriptor, CheckThisNamedPropertyDeleter,
+      CheckThisNamedPropertyEnumerator, CheckThisNamedPropertyDefiner));
+
+  bottom = templ->GetFunction(env.local())
+               .ToLocalChecked()
+               ->NewInstance(env.local())
+               .ToLocalChecked();
+  Local<v8::Object> top = templ->GetFunction(env.local())
+                              .ToLocalChecked()
+                              ->NewInstance(env.local())
+                              .ToLocalChecked();
+  Local<v8::Object> middle = templ->GetFunction(env.local())
+                                 .ToLocalChecked()
+                                 ->NewInstance(env.local())
+                                 .ToLocalChecked();
+
+  bottom->SetPrototype(env.local(), middle).FromJust();
+  middle->SetPrototype(env.local(), top).FromJust();
+  env->Global()->Set(env.local(), v8_str("obj"), bottom).FromJust();
+
+  // Indexed and named get.
+  CompileRun("obj[0]");
+  CompileRun("obj.x");
+
+  // Indexed and named set.
+  CompileRun("obj[1] = 42");
+  CompileRun("obj.y = 42");
+
+  // Indexed and named deleter.
+  CompileRun("delete obj[0]");
+  CompileRun("delete obj.x");
+
+  // Enumerators.
+  CompileRun("for (var p in obj) ;");
 
   // Indexed and named definer.
   CompileRun("Object.defineProperty(obj, 2, {});");
   CompileRun("Object.defineProperty(obj, 'z', {});");
+
+  // Indexed and named propertyDescriptor.
+  CompileRun("Object.getOwnPropertyDescriptor(obj, 2);");
+  CompileRun("Object.getOwnPropertyDescriptor(obj, 'z');");
 }
 
 
 bool is_bootstrapping = false;
 static void PrePropertyHandlerGet(
     Local<Name> key, const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (!is_bootstrapping &&
       v8_str("pre")
           ->Equals(info.GetIsolate()->GetCurrentContext(), key)
@@ skipping 2783 matching lines @@
             ->Set(env.local(), v8_str("Fun"),
                   fun_templ->GetFunction(env.local()).ToLocalChecked())
             .FromJust());
 
   CompileRun(
       "var f = new Fun();"
       "Number.prototype.__proto__ = f;"
       "var a = 42;"
       "for (var i = 0; i<3; i++) { a.foo; }");
 }