| $$ This is a pump file for generating file templates. Pump is a python |
| $$ script that is part of the Google Test suite of utilities. Description |
| $$ can be found here: |
| $$ |
| $$ http://code.google.com/p/googletest/wiki/PumpManual |
| $$ |
| |
| $$ This should be no larger than MAX_ARITY in base/bind.h.pump. |
| $var MAX_ARITY = 7 |
| /* |
| * Copyright 2016 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // clang-format off |
| |
| #ifndef COBALT_SCRIPT_MOZJS_MOZJS_CALLBACK_FUNCTION_H_ |
| #define COBALT_SCRIPT_MOZJS_MOZJS_CALLBACK_FUNCTION_H_ |
| |
| #include "base/logging.h" |
| #include "cobalt/script/callback_function.h" |
| #include "cobalt/script/mozjs/conversion_helpers.h" |
| #include "cobalt/script/mozjs/convert_callback_return_value.h" |
| #include "cobalt/script/mozjs/weak_heap_object.h" |
| #include "third_party/mozjs/js/src/jsapi.h" |
| #include "third_party/mozjs/js/src/jscntxt.h" |
| |
| namespace cobalt { |
| namespace script { |
| namespace mozjs { |
| |
| // First, we forward declare the Callback class template. This informs the |
| // compiler that the template only has 1 type parameter which is the base |
| // CallbackFunction template class with parameters. |
| // |
| // See base/callback.h.pump for further discussion on this pattern. |
| template <typename Sig> |
| class MozjsCallbackFunction; |
| |
| $range ARITY 0..MAX_ARITY |
| $for ARITY [[ |
| $range ARG 1..ARITY |
| |
| |
| $if ARITY == 0 [[ |
| template <typename R> |
| class MozjsCallbackFunction<R(void)> |
| : public CallbackFunction<R(void)> { |
| ]] $else [[ |
| template <typename R, $for ARG , [[typename A$(ARG)]]> |
| class MozjsCallbackFunction<R($for ARG , [[A$(ARG)]])> |
| : public CallbackFunction<R($for ARG , [[A$(ARG)]])> { |
| ]] |
| |
| public: |
| typedef CallbackFunction<R($for ARG , [[A$(ARG)]])> BaseType; |
| |
| explicit MozjsCallbackFunction(JSContext* context, JS::HandleObject function) |
| : context_(context), weak_function_(context, function) { |
| DCHECK(context_); |
| DCHECK(JS_ObjectIsFunction(context_, function)); |
| } |
| |
| CallbackResult<R> Run($for ARG , [[ |
| |
| typename base::internal::CallbackParamTraits<A$(ARG)>::ForwardType a$(ARG)]]) |
| const OVERRIDE { |
| CallbackResult<R> callback_result; |
| JS::RootedObject function(context_, weak_function_.Get()); |
| if (!function) { |
| DLOG(WARNING) << "Function was garbage collected."; |
| callback_result.exception = true; |
| } else { |
| JSAutoRequest auto_request(context_); |
| JSAutoCompartment auto_compartment(context_, function); |
| |
| // https://www.w3.org/TR/WebIDL/#es-invoking-callback-functions |
| // Callback 'this' is set to null, unless overridden by other specifications |
| JS::Value this_value(JS::NullValue()); |
| JS::RootedValue return_value(context_); |
| const int kNumArguments = $(ARITY); |
| |
| |
| $if ARITY > 0 [[ |
| JS::Value args[$(ARITY)]; |
| js::SetValueRangeToNull(args, kNumArguments); |
| js::AutoValueArray auto_array_rooter(context_, args, kNumArguments); |
| $for ARG [[ToJSValue(context_, a$(ARG), auto_array_rooter.handleAt($(ARG - 1))); |
| ]] |
| |
| JSBool call_result = JS::Call(context_, this_value, function, |
| kNumArguments, args, return_value.address()); |
| ]] $else [[ |
| JSBool call_result = JS::Call(context_, this_value, function, 0, NULL, |
| return_value.address()); |
| ]] |
| |
| if (!call_result) { |
| DLOG(WARNING) << "Exception in callback."; |
| callback_result.exception = true; |
| } else { |
| callback_result = ConvertCallbackReturnValue<R>(context_, return_value); |
| } |
| } |
| return callback_result; |
| } |
| |
| JSObject* handle() const { return weak_function_.Get(); } |
| |
| private: |
| JSContext* context_; |
| WeakHeapObject weak_function_; |
| }; |
| |
| ]] |
| |
| template <typename Signature> |
| struct TypeTraits<CallbackFunction<Signature> > { |
| typedef MozjsUserObjectHolder<MozjsCallbackFunction<Signature> > ConversionType; |
| typedef const ScriptObject<CallbackFunction<Signature> >* ReturnType; |
| }; |
| |
| } // namespace mozjs |
| } // namespace script |
| } // namespace cobalt |
| |
| #endif // COBALT_SCRIPT_MOZJS_MOZJS_CALLBACK_FUNCTION_H_ |