testCallNonGenericMethodOnProxy.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "js/CallAndConstruct.h"

#include "js/GlobalObject.h"

#include "js/Object.h"  // JS::GetClass, JS::GetReservedSlot

#include "jsapi-tests/tests.h"

using namespace JS;

static const JSClass CustomClass = {"CustomClass",

                                    JSCLASS_HAS_RESERVED_SLOTS(1)};

static const uint32_t CUSTOM_SLOT = 0;

static bool IsCustomClass(JS::Handle<JS::Value> v) {

  return v.isObject() && JS::GetClass(&v.toObject()) == &CustomClass;

static bool CustomMethodImpl(JSContext* cx, const CallArgs& args) {

  MOZ_RELEASE_ASSERT(IsCustomClass(args.thisv()));

  args.rval().set(JS::GetReservedSlot(&args.thisv().toObject(), CUSTOM_SLOT));

  return true;

static bool CustomMethod(JSContext* cx, unsigned argc, Value* vp) {

  CallArgs args = CallArgsFromVp(argc, vp);

  return CallNonGenericMethod(cx, IsCustomClass, CustomMethodImpl, args);

BEGIN_TEST(test_CallNonGenericMethodOnProxy) {

  // Create the first global object and compartment

  JS::RealmOptions options;

  JS::RootedObject globalA(

      cx, JS_NewGlobalObject(cx, getGlobalClass(), nullptr,

                             JS::FireOnNewGlobalHook, options));

  CHECK(globalA);

  JS::RootedObject customA(cx, JS_NewObject(cx, &CustomClass));

  CHECK(customA);

  JS_SetReservedSlot(customA, CUSTOM_SLOT, Int32Value(17));

  JS::RootedFunction customMethodA(

      cx, JS_NewFunction(cx, CustomMethod, 0, 0, "customMethodA"));

  CHECK(customMethodA);

  JS::RootedValue rval(cx);

  CHECK(JS_CallFunction(cx, customA, customMethodA,

                        JS::HandleValueArray::empty(), &rval));

  CHECK_SAME(rval, Int32Value(17));

  // Now create the second global object and compartment...

    JS::RealmOptions options;

    JS::RootedObject globalB(

        cx, JS_NewGlobalObject(cx, getGlobalClass(), nullptr,

                               JS::FireOnNewGlobalHook, options));

    CHECK(globalB);

    // ...and enter it.

    JSAutoRealm enter(cx, globalB);

    JS::RootedObject customB(cx, JS_NewObject(cx, &CustomClass));

    CHECK(customB);

    JS_SetReservedSlot(customB, CUSTOM_SLOT, Int32Value(42));

    JS::RootedFunction customMethodB(

        cx, JS_NewFunction(cx, CustomMethod, 0, 0, "customMethodB"));

    CHECK(customMethodB);

    JS::RootedValue rval(cx);

    CHECK(JS_CallFunction(cx, customB, customMethodB,

                          JS::HandleValueArray::empty(), &rval));

    CHECK_SAME(rval, Int32Value(42));

    JS::RootedObject wrappedCustomA(cx, customA);

    CHECK(JS_WrapObject(cx, &wrappedCustomA));

    JS::RootedValue rval2(cx);

    CHECK(JS_CallFunction(cx, wrappedCustomA, customMethodB,

                          JS::HandleValueArray::empty(), &rval2));

    CHECK_SAME(rval, Int32Value(42));

  return true;

END_TEST(test_CallNonGenericMethodOnProxy)