| // This file was GENERATED by command: |
| // pump.py function_template.h.pump |
| // DO NOT EDIT BY HAND!!! |
| |
| |
| |
| #ifndef GIN_FUNCTION_TEMPLATE_H_ |
| #define GIN_FUNCTION_TEMPLATE_H_ |
| |
| // Copyright 2013 The Chromium 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 "base/callback.h" |
| #include "base/logging.h" |
| #include "gin/arguments.h" |
| #include "gin/converter.h" |
| #include "gin/gin_export.h" |
| #include "gin/handle.h" |
| #include "gin/public/gin_embedders.h" |
| #include "gin/public/wrapper_info.h" |
| #include "gin/wrappable.h" |
| |
| #include "v8/include/v8.h" |
| |
| namespace gin { |
| |
| class PerIsolateData; |
| |
| enum CreateFunctionTemplateFlags { |
| HolderIsFirstArgument = 1 << 0, |
| }; |
| |
| namespace internal { |
| |
| template<typename T> |
| struct CallbackParamTraits { |
| typedef T LocalType; |
| }; |
| template<typename T> |
| struct CallbackParamTraits<const T&> { |
| typedef T LocalType; |
| }; |
| template<typename T> |
| struct CallbackParamTraits<const T*> { |
| typedef T* LocalType; |
| }; |
| |
| |
| // CallbackHolder and CallbackHolderBase are used to pass a base::Callback from |
| // CreateFunctionTemplate through v8 (via v8::FunctionTemplate) to |
| // DispatchToCallback, where it is invoked. |
| // |
| // v8::FunctionTemplate only supports passing void* as data so how do we know |
| // when to delete the base::Callback? That's where CallbackHolderBase comes in. |
| // It inherits from Wrappable, which delete itself when both (a) the refcount |
| // via base::RefCounted has dropped to zero, and (b) there are no more |
| // JavaScript references in V8. |
| |
| // This simple base class is used so that we can share a single object template |
| // among every CallbackHolder instance. |
| class GIN_EXPORT CallbackHolderBase : public Wrappable<CallbackHolderBase> { |
| public: |
| static WrapperInfo kWrapperInfo; |
| protected: |
| virtual ~CallbackHolderBase() {} |
| }; |
| |
| template<typename Sig> |
| class CallbackHolder : public CallbackHolderBase { |
| public: |
| CallbackHolder(const base::Callback<Sig>& callback, int flags) |
| : callback(callback), flags(flags) {} |
| base::Callback<Sig> callback; |
| int flags; |
| private: |
| virtual ~CallbackHolder() {} |
| }; |
| |
| |
| // This set of templates invokes a base::Callback, converts the return type to a |
| // JavaScript value, and returns that value to script via the provided |
| // gin::Arguments object. |
| // |
| // In C++, you can declare the function foo(void), but you can't pass a void |
| // expression to foo. As a result, we must specialize the case of Callbacks that |
| // have the void return type. |
| template<typename R, typename P1 = void, typename P2 = void, |
| typename P3 = void, typename P4 = void> |
| struct Invoker { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<R(P1, P2, P3, P4)>& callback, |
| const P1& a1, |
| const P2& a2, |
| const P3& a3, |
| const P4& a4) { |
| args->Return(callback.Run(a1, a2, a3, a4)); |
| } |
| }; |
| template<typename P1, typename P2, typename P3, typename P4> |
| struct Invoker<void, P1, P2, P3, P4> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<void(P1, P2, P3, P4)>& callback, |
| const P1& a1, |
| const P2& a2, |
| const P3& a3, |
| const P4& a4) { |
| callback.Run(a1, a2, a3, a4); |
| } |
| }; |
| |
| template<typename R, typename P1, typename P2, typename P3> |
| struct Invoker<R, P1, P2, P3, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<R(P1, P2, P3)>& callback, |
| const P1& a1, |
| const P2& a2, |
| const P3& a3) { |
| args->Return(callback.Run(a1, a2, a3)); |
| } |
| }; |
| template<typename P1, typename P2, typename P3> |
| struct Invoker<void, P1, P2, P3, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<void(P1, P2, P3)>& callback, |
| const P1& a1, |
| const P2& a2, |
| const P3& a3) { |
| callback.Run(a1, a2, a3); |
| } |
| }; |
| |
| template<typename R, typename P1, typename P2> |
| struct Invoker<R, P1, P2, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<R(P1, P2)>& callback, |
| const P1& a1, |
| const P2& a2) { |
| args->Return(callback.Run(a1, a2)); |
| } |
| }; |
| template<typename P1, typename P2> |
| struct Invoker<void, P1, P2, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<void(P1, P2)>& callback, |
| const P1& a1, |
| const P2& a2) { |
| callback.Run(a1, a2); |
| } |
| }; |
| |
| template<typename R, typename P1> |
| struct Invoker<R, P1, void, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<R(P1)>& callback, |
| const P1& a1) { |
| args->Return(callback.Run(a1)); |
| } |
| }; |
| template<typename P1> |
| struct Invoker<void, P1, void, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<void(P1)>& callback, |
| const P1& a1) { |
| callback.Run(a1); |
| } |
| }; |
| |
| template<typename R> |
| struct Invoker<R, void, void, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<R()>& callback) { |
| args->Return(callback.Run()); |
| } |
| }; |
| template<> |
| struct Invoker<void, void, void, void, void> { |
| inline static void Go( |
| Arguments* args, |
| const base::Callback<void()>& callback) { |
| callback.Run(); |
| } |
| }; |
| |
| |
| template<typename T> |
| bool GetNextArgument(Arguments* args, int create_flags, bool is_first, |
| T* result) { |
| if (is_first && (create_flags & HolderIsFirstArgument) != 0) { |
| return args->GetHolder(result); |
| } else { |
| return args->GetNext(result); |
| } |
| } |
| |
| // For advanced use cases, we allow callers to request the unparsed Arguments |
| // object and poke around in it directly. |
| inline bool GetNextArgument(Arguments* args, int create_flags, bool is_first, |
| Arguments* result) { |
| *result = *args; |
| return true; |
| } |
| |
| |
| // DispatchToCallback converts all the JavaScript arguments to C++ types and |
| // invokes the base::Callback. |
| template<typename Sig> |
| struct Dispatcher { |
| }; |
| |
| template<typename R> |
| struct Dispatcher<R()> { |
| static void DispatchToCallback( |
| const v8::FunctionCallbackInfo<v8::Value>& info) { |
| Arguments args(info); |
| CallbackHolderBase* holder_base = NULL; |
| CHECK(args.GetData(&holder_base)); |
| |
| typedef CallbackHolder<R()> HolderT; |
| HolderT* holder = static_cast<HolderT*>(holder_base); |
| |
| Invoker<R>::Go(&args, holder->callback); |
| } |
| }; |
| |
| template<typename R, typename P1> |
| struct Dispatcher<R(P1)> { |
| static void DispatchToCallback( |
| const v8::FunctionCallbackInfo<v8::Value>& info) { |
| Arguments args(info); |
| CallbackHolderBase* holder_base = NULL; |
| CHECK(args.GetData(&holder_base)); |
| |
| typedef CallbackHolder<R(P1)> HolderT; |
| HolderT* holder = static_cast<HolderT*>(holder_base); |
| |
| typename CallbackParamTraits<P1>::LocalType a1; |
| if (!GetNextArgument(&args, holder->flags, true, &a1)) { |
| args.ThrowError(); |
| return; |
| } |
| |
| Invoker<R, P1>::Go(&args, holder->callback, a1); |
| } |
| }; |
| |
| template<typename R, typename P1, typename P2> |
| struct Dispatcher<R(P1, P2)> { |
| static void DispatchToCallback( |
| const v8::FunctionCallbackInfo<v8::Value>& info) { |
| Arguments args(info); |
| CallbackHolderBase* holder_base = NULL; |
| CHECK(args.GetData(&holder_base)); |
| |
| typedef CallbackHolder<R(P1, P2)> HolderT; |
| HolderT* holder = static_cast<HolderT*>(holder_base); |
| |
| typename CallbackParamTraits<P1>::LocalType a1; |
| typename CallbackParamTraits<P2>::LocalType a2; |
| if (!GetNextArgument(&args, holder->flags, true, &a1) || |
| !GetNextArgument(&args, holder->flags, false, &a2)) { |
| args.ThrowError(); |
| return; |
| } |
| |
| Invoker<R, P1, P2>::Go(&args, holder->callback, a1, a2); |
| } |
| }; |
| |
| template<typename R, typename P1, typename P2, typename P3> |
| struct Dispatcher<R(P1, P2, P3)> { |
| static void DispatchToCallback( |
| const v8::FunctionCallbackInfo<v8::Value>& info) { |
| Arguments args(info); |
| CallbackHolderBase* holder_base = NULL; |
| CHECK(args.GetData(&holder_base)); |
| |
| typedef CallbackHolder<R(P1, P2, P3)> HolderT; |
| HolderT* holder = static_cast<HolderT*>(holder_base); |
| |
| typename CallbackParamTraits<P1>::LocalType a1; |
| typename CallbackParamTraits<P2>::LocalType a2; |
| typename CallbackParamTraits<P3>::LocalType a3; |
| if (!GetNextArgument(&args, holder->flags, true, &a1) || |
| !GetNextArgument(&args, holder->flags, false, &a2) || |
| !GetNextArgument(&args, holder->flags, false, &a3)) { |
| args.ThrowError(); |
| return; |
| } |
| |
| Invoker<R, P1, P2, P3>::Go(&args, holder->callback, a1, a2, a3); |
| } |
| }; |
| |
| template<typename R, typename P1, typename P2, typename P3, typename P4> |
| struct Dispatcher<R(P1, P2, P3, P4)> { |
| static void DispatchToCallback( |
| const v8::FunctionCallbackInfo<v8::Value>& info) { |
| Arguments args(info); |
| CallbackHolderBase* holder_base = NULL; |
| CHECK(args.GetData(&holder_base)); |
| |
| typedef CallbackHolder<R(P1, P2, P3, P4)> HolderT; |
| HolderT* holder = static_cast<HolderT*>(holder_base); |
| |
| typename CallbackParamTraits<P1>::LocalType a1; |
| typename CallbackParamTraits<P2>::LocalType a2; |
| typename CallbackParamTraits<P3>::LocalType a3; |
| typename CallbackParamTraits<P4>::LocalType a4; |
| if (!GetNextArgument(&args, holder->flags, true, &a1) || |
| !GetNextArgument(&args, holder->flags, false, &a2) || |
| !GetNextArgument(&args, holder->flags, false, &a3) || |
| !GetNextArgument(&args, holder->flags, false, &a4)) { |
| args.ThrowError(); |
| return; |
| } |
| |
| Invoker<R, P1, P2, P3, P4>::Go(&args, holder->callback, a1, a2, a3, a4); |
| } |
| }; |
| |
| } // namespace internal |
| |
| |
| // This should be called once per-isolate to initialize the function template |
| // system. |
| GIN_EXPORT void InitFunctionTemplates(PerIsolateData* isolate_data); |
| |
| |
| // CreateFunctionTemplate creates a v8::FunctionTemplate that will create |
| // JavaScript functions that execute a provided C++ function or base::Callback. |
| // JavaScript arguments are automatically converted via gin::Converter, as is |
| // the return value of the C++ function, if any. |
| template<typename Sig> |
| v8::Local<v8::FunctionTemplate> CreateFunctionTemplate( |
| v8::Isolate* isolate, const base::Callback<Sig> callback, |
| int callback_flags = 0) { |
| typedef internal::CallbackHolder<Sig> HolderT; |
| gin::Handle<HolderT> holder = CreateHandle( |
| isolate, new HolderT(callback, callback_flags)); |
| return v8::FunctionTemplate::New( |
| &internal::Dispatcher<Sig>::DispatchToCallback, |
| ConvertToV8<internal::CallbackHolderBase*>(isolate, holder.get())); |
| } |
| |
| } // namespace gin |
| |
| #endif // GIN_FUNCTION_TEMPLATE_H_ |