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src: concentrate callbacks provided to core N-API
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This change reduces the places where we declare private functions with
the `napi_callback` signature for the purpose of using them with C++
callbacks passed as template arguments. We basically have 4 types:

  1. static with `void` return
  2. static with `napi_value` return
  3. instance with `void` return
  4. instance with `napi_value` return

We can use one of these four calling patterns in the following places
where we accept callbacks as template arguments:
  * `Napi::Function` (1. and 2.)
  * `Napi::PropertyDescriptor` (1. for the setter, 2. for the getter)
  * `Napi::InstanceWrap<T>` (3., 4. for instance methods, 4. for
     instance getters)
  * `Napi::ObjectWrap<T>` (1., 2. for static methods, 2. for static
     getters)

In the case of `InstanceWrap<T>` and `ObjectWrap<T>` instance resp.
static property descriptors we can also remove the infrastructure
designed to allow for optional getters (`GetterTag` resp.
`StaticGetterTag`) because the API for specifying instance resp. class
property descriptors does not allow one to omit the getter.

Signed-off-by: Gabriel Schulhof <[email protected]>
PR-URL: #786
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
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Gabriel Schulhof committed Aug 25, 2020
1 parent 2bc45bb commit 9aceea7
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Showing 2 changed files with 72 additions and 113 deletions.
162 changes: 72 additions & 90 deletions napi-inl.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,48 @@ struct CallbackData<Callable, void> {
void* data;
};

template <void (*Callback)(const CallbackInfo& info)>
static napi_value
TemplatedVoidCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
return details::WrapCallback([&] {
CallbackInfo cbInfo(env, info);
Callback(cbInfo);
return nullptr;
});
}

template <Napi::Value (*Callback)(const CallbackInfo& info)>
static napi_value
TemplatedCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
return details::WrapCallback([&] {
CallbackInfo cbInfo(env, info);
return Callback(cbInfo);
});
}

template <typename T,
Napi::Value (T::*UnwrapCallback)(const CallbackInfo& info)>
static napi_value
TemplatedInstanceCallback(napi_env env, napi_callback_info info) NAPI_NOEXCEPT {
return details::WrapCallback([&] {
CallbackInfo cbInfo(env, info);
T* instance = T::Unwrap(cbInfo.This().As<Object>());
return (instance->*UnwrapCallback)(cbInfo);
});
}

template <typename T, void (T::*UnwrapCallback)(const CallbackInfo& info)>
static napi_value
TemplatedInstanceVoidCallback(napi_env env,
napi_callback_info info) NAPI_NOEXCEPT {
return details::WrapCallback([&] {
CallbackInfo cbInfo(env, info);
T* instance = T::Unwrap(cbInfo.This().As<Object>());
(instance->*UnwrapCallback)(cbInfo);
return nullptr;
});
}

template <typename T, typename Finalizer, typename Hint = void>
struct FinalizeData {
static inline
Expand Down Expand Up @@ -1845,30 +1887,25 @@ CreateFunction(napi_env env,
template <Function::VoidCallback cb>
inline Function Function::New(napi_env env, const char* utf8name, void* data) {
napi_value result = nullptr;
napi_status status = napi_create_function(
env, utf8name, NAPI_AUTO_LENGTH,
[](napi_env env, napi_callback_info info) {
CallbackInfo callbackInfo(env, info);
return details::WrapCallback([&] {
cb(callbackInfo);
return nullptr;
});
}, data, &result);
napi_status status = napi_create_function(env,
utf8name,
NAPI_AUTO_LENGTH,
details::TemplatedVoidCallback<cb>,
data,
&result);
NAPI_THROW_IF_FAILED(env, status, Function());
return Function(env, result);
}

template <Function::Callback cb>
inline Function Function::New(napi_env env, const char* utf8name, void* data) {
napi_value result = nullptr;
napi_status status = napi_create_function(
env, utf8name, NAPI_AUTO_LENGTH,
[](napi_env env, napi_callback_info info) {
CallbackInfo callbackInfo(env, info);
return details::WrapCallback([&] {
return cb(callbackInfo);
});
}, data, &result);
napi_status status = napi_create_function(env,
utf8name,
NAPI_AUTO_LENGTH,
details::TemplatedCallback<cb>,
data,
&result);
NAPI_THROW_IF_FAILED(env, status, Function());
return Function(env, result);
}
Expand Down Expand Up @@ -2859,7 +2896,7 @@ PropertyDescriptor::Accessor(const char* utf8name,
napi_property_descriptor desc = napi_property_descriptor();

desc.utf8name = utf8name;
desc.getter = &GetterCallbackWrapper<Getter>;
desc.getter = details::TemplatedCallback<Getter>;
desc.attributes = attributes;
desc.data = data;

Expand All @@ -2882,7 +2919,7 @@ PropertyDescriptor::Accessor(Name name,
napi_property_descriptor desc = napi_property_descriptor();

desc.name = name;
desc.getter = &GetterCallbackWrapper<Getter>;
desc.getter = details::TemplatedCallback<Getter>;
desc.attributes = attributes;
desc.data = data;

Expand All @@ -2900,8 +2937,8 @@ PropertyDescriptor::Accessor(const char* utf8name,
napi_property_descriptor desc = napi_property_descriptor();

desc.utf8name = utf8name;
desc.getter = &GetterCallbackWrapper<Getter>;
desc.setter = &SetterCallbackWrapper<Setter>;
desc.getter = details::TemplatedCallback<Getter>;
desc.setter = details::TemplatedVoidCallback<Setter>;
desc.attributes = attributes;
desc.data = data;

Expand All @@ -2928,31 +2965,14 @@ PropertyDescriptor::Accessor(Name name,
napi_property_descriptor desc = napi_property_descriptor();

desc.name = name;
desc.getter = &GetterCallbackWrapper<Getter>;
desc.setter = &SetterCallbackWrapper<Setter>;
desc.getter = details::TemplatedCallback<Getter>;
desc.setter = details::TemplatedVoidCallback<Setter>;
desc.attributes = attributes;
desc.data = data;

return desc;
}

template <typename PropertyDescriptor::GetterCallback Getter>
napi_value
PropertyDescriptor::GetterCallbackWrapper(napi_env env,
napi_callback_info info) {
CallbackInfo cbInfo(env, info);
return Getter(cbInfo);
}

template <typename PropertyDescriptor::SetterCallback Setter>
napi_value
PropertyDescriptor::SetterCallbackWrapper(napi_env env,
napi_callback_info info) {
CallbackInfo cbInfo(env, info);
Setter(cbInfo);
return nullptr;
}

template <typename Getter>
inline PropertyDescriptor
PropertyDescriptor::Accessor(Napi::Env env,
Expand Down Expand Up @@ -3283,7 +3303,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.method = &InstanceWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedInstanceVoidCallback<T, method>;
desc.data = data;
desc.attributes = attributes;
return desc;
Expand All @@ -3297,7 +3317,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.method = &InstanceWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedInstanceCallback<T, method>;
desc.data = data;
desc.attributes = attributes;
return desc;
Expand All @@ -3311,7 +3331,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.method = &InstanceWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedInstanceVoidCallback<T, method>;
desc.data = data;
desc.attributes = attributes;
return desc;
Expand All @@ -3325,7 +3345,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.method = &InstanceWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedInstanceCallback<T, method>;
desc.data = data;
desc.attributes = attributes;
return desc;
Expand Down Expand Up @@ -3378,7 +3398,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.getter = This::WrapGetter(This::GetterTag<getter>());
desc.getter = details::TemplatedInstanceCallback<T, getter>;
desc.setter = This::WrapSetter(This::SetterTag<setter>());
desc.data = data;
desc.attributes = attributes;
Expand All @@ -3394,7 +3414,7 @@ inline ClassPropertyDescriptor<T> InstanceWrap<T>::InstanceAccessor(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.getter = This::WrapGetter(This::GetterTag<getter>());
desc.getter = details::TemplatedInstanceCallback<T, getter>;
desc.setter = This::WrapSetter(This::SetterTag<setter>());
desc.data = data;
desc.attributes = attributes;
Expand Down Expand Up @@ -3487,27 +3507,6 @@ inline napi_value InstanceWrap<T>::InstanceSetterCallbackWrapper(
});
}

template <typename T>
template <typename InstanceWrap<T>::InstanceVoidMethodCallback method>
inline napi_value InstanceWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
return details::WrapCallback([&] {
const CallbackInfo cbInfo(env, info);
T* instance = T::Unwrap(cbInfo.This().As<Object>());
(instance->*method)(cbInfo);
return nullptr;
});
}

template <typename T>
template <typename InstanceWrap<T>::InstanceMethodCallback method>
inline napi_value InstanceWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
return details::WrapCallback([&] {
const CallbackInfo cbInfo(env, info);
T* instance = T::Unwrap(cbInfo.This().As<Object>());
return (instance->*method)(cbInfo);
});
}

template <typename T>
template <typename InstanceWrap<T>::InstanceSetterCallback method>
inline napi_value InstanceWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
Expand Down Expand Up @@ -3732,7 +3731,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.method = &ObjectWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedVoidCallback<method>;
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
return desc;
Expand All @@ -3746,7 +3745,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.method = &ObjectWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedVoidCallback<method>;
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
return desc;
Expand All @@ -3760,7 +3759,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.method = &ObjectWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedCallback<method>;
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
return desc;
Expand All @@ -3774,7 +3773,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticMethod(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.method = &ObjectWrap<T>::WrappedMethod<method>;
desc.method = details::TemplatedCallback<method>;
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
return desc;
Expand Down Expand Up @@ -3827,7 +3826,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.utf8name = utf8name;
desc.getter = This::WrapStaticGetter(This::StaticGetterTag<getter>());
desc.getter = details::TemplatedCallback<getter>;
desc.setter = This::WrapStaticSetter(This::StaticSetterTag<setter>());
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
Expand All @@ -3843,7 +3842,7 @@ inline ClassPropertyDescriptor<T> ObjectWrap<T>::StaticAccessor(
void* data) {
napi_property_descriptor desc = napi_property_descriptor();
desc.name = name;
desc.getter = This::WrapStaticGetter(This::StaticGetterTag<getter>());
desc.getter = details::TemplatedCallback<getter>;
desc.setter = This::WrapStaticSetter(This::StaticSetterTag<setter>());
desc.data = data;
desc.attributes = static_cast<napi_property_attributes>(attributes | napi_static);
Expand Down Expand Up @@ -3969,23 +3968,6 @@ inline void ObjectWrap<T>::FinalizeCallback(napi_env env, void* data, void* /*hi
delete instance;
}

template <typename T>
template <typename ObjectWrap<T>::StaticVoidMethodCallback method>
inline napi_value ObjectWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
return details::WrapCallback([&] {
method(CallbackInfo(env, info));
return nullptr;
});
}

template <typename T>
template <typename ObjectWrap<T>::StaticMethodCallback method>
inline napi_value ObjectWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
return details::WrapCallback([&] {
return method(CallbackInfo(env, info));
});
}

template <typename T>
template <typename ObjectWrap<T>::StaticSetterCallback method>
inline napi_value ObjectWrap<T>::WrappedMethod(napi_env env, napi_callback_info info) noexcept {
Expand Down
23 changes: 0 additions & 23 deletions napi.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1623,10 +1623,6 @@ namespace Napi {
operator const napi_property_descriptor&() const;

private:
template <GetterCallback Getter>
static napi_value GetterCallbackWrapper(napi_env env, napi_callback_info info);
template <SetterCallback Setter>
static napi_value SetterCallbackWrapper(napi_env env, napi_callback_info info);
napi_property_descriptor _desc;
};

Expand Down Expand Up @@ -1748,16 +1744,8 @@ namespace Napi {
template <InstanceSetterCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;

template <InstanceGetterCallback getter> struct GetterTag {};
template <InstanceSetterCallback setter> struct SetterTag {};

template <InstanceVoidMethodCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;
template <InstanceMethodCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;
template <InstanceGetterCallback getter>
static napi_callback WrapGetter(GetterTag<getter>) noexcept { return &This::WrappedMethod<getter>; }
static napi_callback WrapGetter(GetterTag<nullptr>) noexcept { return nullptr; }
template <InstanceSetterCallback setter>
static napi_callback WrapSetter(SetterTag<setter>) noexcept { return &This::WrappedMethod<setter>; }
static napi_callback WrapSetter(SetterTag<nullptr>) noexcept { return nullptr; }
Expand Down Expand Up @@ -1892,22 +1880,11 @@ namespace Napi {
StaticGetterCallback,
StaticSetterCallback> StaticAccessorCallbackData;

template <StaticVoidMethodCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;

template <StaticMethodCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;

template <StaticSetterCallback method>
static napi_value WrappedMethod(napi_env env, napi_callback_info info) noexcept;

template <StaticGetterCallback getter> struct StaticGetterTag {};
template <StaticSetterCallback setter> struct StaticSetterTag {};

template <StaticGetterCallback getter>
static napi_callback WrapStaticGetter(StaticGetterTag<getter>) noexcept { return &This::WrappedMethod<getter>; }
static napi_callback WrapStaticGetter(StaticGetterTag<nullptr>) noexcept { return nullptr; }

template <StaticSetterCallback setter>
static napi_callback WrapStaticSetter(StaticSetterTag<setter>) noexcept { return &This::WrappedMethod<setter>; }
static napi_callback WrapStaticSetter(StaticSetterTag<nullptr>) noexcept { return nullptr; }
Expand Down

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