godot-cpp/include/godot_cpp/core/method_bind.hpp

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/*************************************************************************/
/* method_bind.hpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef GODOT_CPP_METHOD_BIND_HPP
#define GODOT_CPP_METHOD_BIND_HPP
#include <godot_cpp/core/binder_common.hpp>
#include <godot_cpp/core/type_info.hpp>
#include <godot_cpp/core/memory.hpp>
#include <godot/gdnative_interface.h>
#include <godot_cpp/classes/global_constants.hpp>
#include <string>
#include <vector>
#include <iostream>
namespace godot {
class MethodBind {
const char *name = nullptr;
const char *instance_class = nullptr;
int argument_count = 0;
uint32_t hint_flags = METHOD_FLAGS_DEFAULT;
bool _is_const = false;
bool _has_return = false;
std::vector<std::string> argument_names;
GDNativeVariantType *argument_types = nullptr;
std::vector<Variant> default_arguments;
protected:
virtual GDNativeVariantType gen_argument_type(int p_arg) const = 0;
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const = 0;
void generate_argument_types(int p_count);
void set_const(bool p_const);
void set_return(bool p_return);
void set_argument_count(int p_count);
public:
const char *get_name() const;
void set_name(const char *p_name);
_FORCE_INLINE_ int get_default_argument_count() const { return default_arguments.size(); }
_FORCE_INLINE_ const std::vector<Variant> &get_default_arguments() const { return default_arguments; }
_FORCE_INLINE_ Variant has_default_argument(int p_arg) const {
int idx = p_arg - (argument_count - default_arguments.size());
if (idx < 0 || idx >= default_arguments.size()) {
return false;
} else {
return true;
}
}
_FORCE_INLINE_ Variant get_default_argument(int p_arg) const {
int idx = p_arg - (argument_count - default_arguments.size());
if (idx < 0 || idx >= default_arguments.size()) {
return Variant();
} else {
return default_arguments[idx];
}
}
_FORCE_INLINE_ const char *get_instance_class() const { return instance_class; }
_FORCE_INLINE_ void set_instance_class(const char *p_class) { instance_class = p_class; }
_FORCE_INLINE_ int get_argument_count() const { return argument_count; };
_FORCE_INLINE_ bool is_const() const { return _is_const; }
_FORCE_INLINE_ bool has_return() const { return _has_return; }
_FORCE_INLINE_ uint32_t get_hint_flags() const { return hint_flags; }
_FORCE_INLINE_ void set_hint_flags(uint32_t p_hint_flags) { hint_flags = p_hint_flags; }
void set_argument_names(const std::vector<std::string> &p_names);
std::vector<std::string> get_argument_names() const;
void set_default_arguments(const std::vector<Variant> &p_default_arguments) { default_arguments = p_default_arguments; }
_FORCE_INLINE_ GDNativeVariantType get_argument_type(int p_argument) const {
ERR_FAIL_COND_V(p_argument < -1 || p_argument > argument_count, GDNATIVE_VARIANT_TYPE_NIL);
return argument_types[p_argument + 1];
}
GDNativePropertyInfo get_argument_info(int p_argument) const;
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int p_argument) const = 0;
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const = 0;
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_return) const = 0;
// Extension info.
static GDNativeVariantType bind_get_argument_type(void *p_method_userdata, int32_t p_argument);
static void bind_get_argument_info(void *p_method_userdata, int32_t p_argument, GDNativePropertyInfo *r_info);
static GDNativeExtensionClassMethodArgumentMetadata bind_get_argument_metadata(void *p_method_userdata, int32_t p_argument);
static void bind_call(void *p_method_userdata, GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeVariantPtr r_return, GDNativeCallError *r_error);
static void bind_ptrcall(void *p_method_userdata, GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_return);
virtual ~MethodBind();
};
template <class T>
class MethodBindVarArg : public MethodBind {
public:
typedef Variant (T::*NativeCall)(const Variant **, GDNativeInt, GDNativeCallError &);
protected:
NativeCall call_method = nullptr;
MethodInfo arguments;
public:
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const {
if (p_arg < 0) {
return arguments.return_val;
} else if (p_arg < arguments.arguments.size()) {
return arguments.arguments[p_arg];
} else {
return PropertyInfo(Variant::NIL, "vararg", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NIL_IS_VARIANT);
}
}
virtual GDNativeVariantType gen_argument_type(int p_arg) const {
return static_cast<GDNativeVariantType>(gen_argument_type_info(p_arg).type);
}
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int) const {
return GDNATIVE_EXTENSION_METHOD_ARGUMENT_METADATA_NONE;
}
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const {
T *instance = static_cast<T *>(p_instance);
return (instance->*call_method)((const Variant **)p_args, p_argument_count, r_error);
}
void set_method_info(const MethodInfo &p_info, bool p_return_nil_is_variant) {
set_argument_count(p_info.arguments.size());
if (p_info.arguments.size()) {
std::vector<std::string> names;
names.reserve(p_info.arguments.size());
for (int i = 0; i < p_info.arguments.size(); i++) {
names.push_back(p_info.arguments[i].name);
}
set_argument_names(names);
}
arguments = p_info;
if (p_return_nil_is_variant) {
arguments.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
}
generate_argument_types(p_info.arguments.size());
}
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_return) const {
ERR_FAIL(); // Can't call.
}
void set_method(NativeCall p_method) { call_method = p_method; }
virtual bool is_const() const { return false; }
virtual bool is_vararg() const { return true; }
MethodBindVarArg() {
set_return(true);
}
};
template <class T>
MethodBind *create_vararg_method_bind(Variant (T::*p_method)(const Variant **, GDNativeInt, GDNativeCallError &), const MethodInfo &p_info, bool p_return_nil_is_variant) {
MethodBindVarArg<T> *a = memnew((MethodBindVarArg<T>));
a->set_method(p_method);
a->set_method_info(p_info, p_return_nil_is_variant);
a->set_instance_class(T::get_class_static());
return a;
}
#ifndef TYPED_METHOD_BIND
class ___UnexistingClass;
#define MB_T ___UnexistingClass
#else
#define MB_T T
#endif
// No return, not const.
#ifdef TYPED_METHOD_BIND
template <class T, class... P>
#else
template <class... P>
#endif // TYPED_METHOD_BIND
class MethodBindT : public MethodBind {
void (MB_T::*method)(P...);
protected:
// GCC raises warnings in the case P = {} as the comparison is always false...
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wlogical-op"
#endif
virtual GDNativeVariantType gen_argument_type(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
return call_get_argument_type<P...>(p_arg);
} else {
return GDNATIVE_VARIANT_TYPE_NIL;
}
}
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const {
GDNativePropertyInfo pi;
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
call_get_argument_type_info<P...>(p_arg, pi);
} else {
pi = PropertyInfo();
}
return pi;
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
public:
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int p_argument) const {
return call_get_argument_metadata<P...>(p_argument);
}
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const {
#ifdef TYPED_METHOD_BIND
call_with_variant_args_dv(static_cast<T *>(p_instance), method, p_args, p_argument_count, r_error, get_default_arguments());
#else
call_with_variant_args_dv(reinterpret_cast<MB_T *>(p_instance), method, p_args, p_argument_count, r_error, get_default_arguments());
#endif
return Variant();
}
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_ret) const {
#ifdef TYPED_METHOD_BIND
call_with_ptr_args<T, P...>(static_cast<T *>(p_instance), method, p_args);
#else
call_with_ptr_args<MB_T, P...>(reinterpret_cast<MB_T *>(p_instance), method, p_args);
#endif // TYPED_METHOD_BIND
}
MethodBindT(void (MB_T::*p_method)(P...)) {
method = p_method;
#ifdef DEBUG_METHODS_ENABLED
generate_argument_types(sizeof...(P));
#endif // DEBUG_METHODS_ENABLED
set_argument_count(sizeof...(P));
}
};
template <class T, class... P>
MethodBind *create_method_bind(void (T::*p_method)(P...)) {
#ifdef TYPED_METHOD_BIND
MethodBind *a = memnew((MethodBindT<T, P...>)(p_method));
#else
MethodBind *a = memnew((MethodBindT<P...>)(reinterpret_cast<void (MB_T::*)(P...)>(p_method)));
#endif // TYPED_METHOD_BIND
a->set_instance_class(T::get_class_static());
return a;
}
// No return, const.
#ifdef TYPED_METHOD_BIND
template <class T, class... P>
#else
template <class... P>
#endif // TYPED_METHOD_BIND
class MethodBindTC : public MethodBind {
void (MB_T::*method)(P...) const;
protected:
// GCC raises warnings in the case P = {} as the comparison is always false...
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wlogical-op"
#endif
virtual GDNativeVariantType gen_argument_type(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
return call_get_argument_type<P...>(p_arg);
} else {
return GDNATIVE_VARIANT_TYPE_NIL;
}
}
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const {
GDNativePropertyInfo pi;
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
call_get_argument_type_info<P...>(p_arg, pi);
} else {
pi = PropertyInfo();
}
return pi;
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
public:
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int p_argument) const {
return call_get_argument_metadata<P...>(p_argument);
}
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const {
#ifdef TYPED_METHOD_BIND
call_with_variant_argsc_dv(static_cast<T *>(p_instance), method, p_args, p_argument_count, r_error, get_default_arguments());
#else
call_with_variant_argsc_dv(reinterpret_cast<MB_T *>(p_instance), method, p_args, p_argument_count, r_error, get_default_arguments());
#endif
return Variant();
}
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_ret) const {
#ifdef TYPED_METHOD_BIND
call_with_ptr_args<T, P...>(static_cast<T *>(p_instance), method, p_args);
#else
call_with_ptr_args<MB_T, P...>(reinterpret_cast<MB_T *>(p_instance), method, p_args);
#endif // TYPED_METHOD_BIND
}
MethodBindTC(void (MB_T::*p_method)(P...) const) {
method = p_method;
#ifdef DEBUG_METHODS_ENABLED
generate_argument_types(sizeof...(P));
#endif // DEBUG_METHODS_ENABLED
set_argument_count(sizeof...(P));
}
};
template <class T, class... P>
MethodBind *create_method_bind(void (T::*p_method)(P...) const) {
#ifdef TYPED_METHOD_BIND
MethodBind *a = memnew((MethodBindTC<T, P...>)(p_method));
#else
MethodBind *a = memnew((MethodBindTC<P...>)(reinterpret_cast<void (MB_T::*)(P...) const>(p_method)));
#endif // TYPED_METHOD_BIND
a->set_instance_class(T::get_class_static());
return a;
}
// Return, not const.
#ifdef TYPED_METHOD_BIND
template <class T, class R, class... P>
#else
template <class R, class... P>
#endif // TYPED_METHOD_BIND
class MethodBindTR : public MethodBind {
R(MB_T::*method)
(P...);
protected:
// GCC raises warnings in the case P = {} as the comparison is always false...
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wlogical-op"
#endif
virtual GDNativeVariantType gen_argument_type(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
return call_get_argument_type<P...>(p_arg);
} else {
return GetTypeInfo<R>::VARIANT_TYPE;
}
}
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
GDNativePropertyInfo pi;
call_get_argument_type_info<P...>(p_arg, pi);
return pi;
} else {
return GetTypeInfo<R>::get_class_info();
}
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
public:
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int p_argument) const {
if (p_argument >= 0) {
return call_get_argument_metadata<P...>(p_argument);
} else {
return GetTypeInfo<R>::METADATA;
}
}
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const {
Variant ret;
#ifdef TYPED_METHOD_BIND
call_with_variant_args_ret_dv(static_cast<T *>(p_instance), method, p_args, p_argument_count, ret, r_error, get_default_arguments());
#else
call_with_variant_args_ret_dv((MB_T *)p_instance, method, p_args, p_argument_count, ret, r_error, get_default_arguments());
#endif
return ret;
}
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_ret) const {
#ifdef TYPED_METHOD_BIND
call_with_ptr_args<T, R, P...>(static_cast<T *>(p_instance), method, p_args, r_ret);
#else
call_with_ptr_args<MB_T, R, P...>(reinterpret_cast<MB_T *>(p_instance), method, p_args, r_ret);
#endif // TYPED_METHOD_BIND
}
MethodBindTR(R (MB_T::*p_method)(P...)) {
method = p_method;
#ifdef DEBUG_METHODS_ENABLED
generate_argument_types(sizeof...(P));
#endif // DEBUG_METHODS_ENABLED
set_argument_count(sizeof...(P));
set_return(true);
}
};
template <class T, class R, class... P>
MethodBind *create_method_bind(R (T::*p_method)(P...)) {
#ifdef TYPED_METHOD_BIND
MethodBind *a = memnew((MethodBindTR<T, R, P...>)(p_method));
#else
MethodBind *a = memnew((MethodBindTR<R, P...>)(reinterpret_cast<R (MB_T::*)(P...)>(p_method)));
#endif // TYPED_METHOD_BIND
a->set_instance_class(T::get_class_static());
return a;
}
// Return, const.
#ifdef TYPED_METHOD_BIND
template <class T, class R, class... P>
#else
template <class R, class... P>
#endif // TYPED_METHOD_BIND
class MethodBindTRC : public MethodBind {
R(MB_T::*method)
(P...) const;
protected:
// GCC raises warnings in the case P = {} as the comparison is always false...
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wlogical-op"
#endif
virtual GDNativeVariantType gen_argument_type(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
return call_get_argument_type<P...>(p_arg);
} else {
return GetTypeInfo<R>::VARIANT_TYPE;
}
}
virtual GDNativePropertyInfo gen_argument_type_info(int p_arg) const {
if (p_arg >= 0 && p_arg < (int)sizeof...(P)) {
GDNativePropertyInfo pi;
call_get_argument_type_info<P...>(p_arg, pi);
return pi;
} else {
return GetTypeInfo<R>::get_class_info();
}
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
public:
virtual GDNativeExtensionClassMethodArgumentMetadata get_argument_metadata(int p_argument) const {
if (p_argument >= 0) {
return call_get_argument_metadata<P...>(p_argument);
} else {
return GetTypeInfo<R>::METADATA;
}
}
virtual Variant call(GDExtensionClassInstancePtr p_instance, const GDNativeVariantPtr *p_args, const GDNativeInt p_argument_count, GDNativeCallError &r_error) const {
Variant ret;
#ifdef TYPED_METHOD_BIND
call_with_variant_args_retc_dv(static_cast<T *>(p_instance), method, p_args, p_argument_count, ret, r_error, get_default_arguments());
#else
call_with_variant_args_retc_dv((MB_T *)p_instance, method, p_args, p_argument_count, ret, r_error, get_default_arguments());
#endif
return ret;
}
virtual void ptrcall(GDExtensionClassInstancePtr p_instance, const GDNativeTypePtr *p_args, GDNativeTypePtr r_ret) const {
#ifdef TYPED_METHOD_BIND
call_with_ptr_args<T, R, P...>(static_cast<T *>(p_instance), method, p_args, r_ret);
#else
call_with_ptr_args<MB_T, R, P...>(reinterpret_cast<MB_T *>(p_instance), method, p_args, r_ret);
#endif // TYPED_METHOD_BIND
}
MethodBindTRC(R (MB_T::*p_method)(P...) const) {
method = p_method;
#ifdef DEBUG_METHODS_ENABLED
generate_argument_types(sizeof...(P));
#endif // DEBUG_METHODS_ENABLED
set_argument_count(sizeof...(P));
set_return(true);
}
};
template <class T, class R, class... P>
MethodBind *create_method_bind(R (T::*p_method)(P...) const) {
#ifdef TYPED_METHOD_BIND
MethodBind *a = memnew((MethodBindTRC<T, R, P...>)(p_method));
#else
MethodBind *a = memnew((MethodBindTRC<R, P...>)(reinterpret_cast<R (MB_T::*)(P...) const>(p_method)));
#endif // TYPED_METHOD_BIND
a->set_instance_class(T::get_class_static());
return a;
}
} // namespace godot
#endif // ! GODOT_CPP_METHOD_BIND_HPP