279 lines
10 KiB
C++
279 lines
10 KiB
C++
/*************************************************************************/
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/* callable_method_pointer.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef CALLABLE_METHOD_POINTER_H
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#define CALLABLE_METHOD_POINTER_H
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#include "core/callable.h"
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#include "core/hashfuncs.h"
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#include "core/object.h"
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#include "core/simple_type.h"
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class CallableCustomMethodPointerBase : public CallableCustom {
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uint32_t *comp_ptr;
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uint32_t comp_size;
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uint32_t h;
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#ifdef DEBUG_METHODS_ENABLED
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const char *text = "";
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#endif
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static bool compare_equal(const CallableCustom *p_a, const CallableCustom *p_b);
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static bool compare_less(const CallableCustom *p_a, const CallableCustom *p_b);
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protected:
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void _setup(uint32_t *p_base_ptr, uint32_t p_ptr_size);
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public:
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#ifdef DEBUG_METHODS_ENABLED
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void set_text(const char *p_text) {
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text = p_text;
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}
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virtual String get_as_text() const {
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return text;
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}
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#else
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virtual String get_as_text() const {
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return String();
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}
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#endif
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virtual CompareEqualFunc get_compare_equal_func() const;
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virtual CompareLessFunc get_compare_less_func() const;
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virtual uint32_t hash() const;
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};
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#ifdef DEBUG_METHODS_ENABLED
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template <class T>
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struct VariantCasterAndValidate {
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static _FORCE_INLINE_ T cast(const Variant **p_args, uint32_t p_arg_idx, Callable::CallError &r_error) {
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Variant::Type argtype = GetTypeInfo<T>::VARIANT_TYPE;
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if (!Variant::can_convert_strict(p_args[p_arg_idx]->get_type(), argtype)) {
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r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
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r_error.argument = p_arg_idx;
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r_error.expected = argtype;
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}
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return VariantCaster<T>::cast(*p_args[p_arg_idx]);
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}
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};
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template <class T>
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struct VariantCasterAndValidate<T &> {
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static _FORCE_INLINE_ T cast(const Variant **p_args, uint32_t p_arg_idx, Callable::CallError &r_error) {
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Variant::Type argtype = GetTypeInfo<T>::VARIANT_TYPE;
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if (!Variant::can_convert_strict(p_args[p_arg_idx]->get_type(), argtype)) {
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r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
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r_error.argument = p_arg_idx;
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r_error.expected = argtype;
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}
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return VariantCaster<T>::cast(*p_args[p_arg_idx]);
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}
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};
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template <class T>
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struct VariantCasterAndValidate<const T &> {
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static _FORCE_INLINE_ T cast(const Variant **p_args, uint32_t p_arg_idx, Callable::CallError &r_error) {
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Variant::Type argtype = GetTypeInfo<T>::VARIANT_TYPE;
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if (!Variant::can_convert_strict(p_args[p_arg_idx]->get_type(), argtype)) {
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r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
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r_error.argument = p_arg_idx;
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r_error.expected = argtype;
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}
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return VariantCaster<T>::cast(*p_args[p_arg_idx]);
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}
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};
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#endif // DEBUG_METHODS_ENABLED
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// GCC 8 raises "parameter 'p_args' set but not used" here, probably using a
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// template version that does not have arguments and thus sees it unused, but
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// obviously the template can be used for functions with and without them, and
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// the optimizer will get rid of it anyway.
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#if defined(DEBUG_METHODS_ENABLED) && defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"
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#endif
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template <class T, class... P, size_t... Is>
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void call_with_variant_args_helper(T *p_instance, void (T::*p_method)(P...), const Variant **p_args, Callable::CallError &r_error, IndexSequence<Is...>) {
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r_error.error = Callable::CallError::CALL_OK;
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#ifdef DEBUG_METHODS_ENABLED
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(p_instance->*p_method)(VariantCasterAndValidate<P>::cast(p_args, Is, r_error)...);
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#else
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(p_instance->*p_method)(VariantCaster<P...>::cast(p_args[Is])...);
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#endif
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}
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#if defined(DEBUG_METHODS_ENABLED) && defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic pop
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#endif
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template <class T, class... P>
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void call_with_variant_args(T *p_instance, void (T::*p_method)(P...), const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
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#ifdef DEBUG_METHODS_ENABLED
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if ((size_t)p_argcount > sizeof...(P)) {
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r_error.error = Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
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r_error.argument = sizeof...(P);
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return;
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}
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if ((size_t)p_argcount < sizeof...(P)) {
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r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
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r_error.argument = sizeof...(P);
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return;
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}
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#endif
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call_with_variant_args_helper<T, P...>(p_instance, p_method, p_args, r_error, BuildIndexSequence<sizeof...(P)>{});
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}
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template <class T, class... P>
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class CallableCustomMethodPointer : public CallableCustomMethodPointerBase {
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struct Data {
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T *instance;
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void (T::*method)(P...);
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} data;
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public:
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virtual ObjectID get_object() const { return data.instance->get_instance_id(); }
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virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, Callable::CallError &r_call_error) const {
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call_with_variant_args(data.instance, data.method, p_arguments, p_argcount, r_call_error);
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}
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CallableCustomMethodPointer(T *p_instance, void (T::*p_method)(P...)) {
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zeromem(&data, sizeof(Data)); // Clear beforehand, may have padding bytes.
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data.instance = p_instance;
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data.method = p_method;
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_setup((uint32_t *)&data, sizeof(Data));
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}
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};
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template <class T, class... P>
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Callable create_custom_callable_function_pointer(T *p_instance,
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#ifdef DEBUG_METHODS_ENABLED
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const char *p_func_text,
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#endif
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void (T::*p_method)(P...)) {
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typedef CallableCustomMethodPointer<T, P...> CCMP; // Messes with memnew otherwise.
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CCMP *ccmp = memnew(CCMP(p_instance, p_method));
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#ifdef DEBUG_METHODS_ENABLED
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ccmp->set_text(p_func_text + 1); // Try to get rid of the ampersand.
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#endif
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return Callable(ccmp);
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}
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// VERSION WITH RETURN
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template <class T, class R, class... P, size_t... Is>
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void call_with_variant_args_ret_helper(T *p_instance, R (T::*p_method)(P...), const Variant **p_args, Variant &r_ret, Callable::CallError &r_error, IndexSequence<Is...>) {
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r_error.error = Callable::CallError::CALL_OK;
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#ifdef DEBUG_METHODS_ENABLED
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r_ret = (p_instance->*p_method)(VariantCasterAndValidate<P>::cast(p_args, Is, r_error)...);
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#else
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(p_instance->*p_method)(VariantCaster<P...>::cast(p_args[Is])...);
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#endif
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}
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template <class T, class R, class... P>
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void call_with_variant_args_ret(T *p_instance, R (T::*p_method)(P...), const Variant **p_args, int p_argcount, Variant &r_ret, Callable::CallError &r_error) {
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#ifdef DEBUG_METHODS_ENABLED
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if ((size_t)p_argcount > sizeof...(P)) {
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r_error.error = Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
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r_error.argument = sizeof...(P);
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return;
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}
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if ((size_t)p_argcount < sizeof...(P)) {
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r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
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r_error.argument = sizeof...(P);
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return;
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}
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#endif
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call_with_variant_args_ret_helper<T, R, P...>(p_instance, p_method, p_args, r_ret, r_error, BuildIndexSequence<sizeof...(P)>{});
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}
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template <class T, class R, class... P>
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class CallableCustomMethodPointerRet : public CallableCustomMethodPointerBase {
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struct Data {
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T *instance;
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R(T::*method)
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(P...);
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} data;
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public:
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virtual ObjectID get_object() const { return data.instance->get_instance_id(); }
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virtual void call(const Variant **p_arguments, int p_argcount, Variant &r_return_value, Callable::CallError &r_call_error) const {
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call_with_variant_args_ret(data.instance, data.method, p_arguments, p_argcount, r_return_value, r_call_error);
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}
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CallableCustomMethodPointerRet(T *p_instance, R (T::*p_method)(P...)) {
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zeromem(&data, sizeof(Data)); // Clear beforehand, may have padding bytes.
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data.instance = p_instance;
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data.method = p_method;
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_setup((uint32_t *)&data, sizeof(Data));
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}
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};
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template <class T, class R, class... P>
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Callable create_custom_callable_function_pointer(T *p_instance,
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#ifdef DEBUG_METHODS_ENABLED
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const char *p_func_text,
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#endif
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R (T::*p_method)(P...)) {
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typedef CallableCustomMethodPointerRet<T, R, P...> CCMP; // Messes with memnew otherwise.
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CCMP *ccmp = memnew(CCMP(p_instance, p_method));
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#ifdef DEBUG_METHODS_ENABLED
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ccmp->set_text(p_func_text + 1); // Try to get rid of the ampersand.
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#endif
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return Callable(ccmp);
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}
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#ifdef DEBUG_METHODS_ENABLED
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#define callable_mp(I, M) create_custom_callable_function_pointer(I, #M, M)
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#else
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#define callable_mp(I, M) create_custom_callable_function_pointer(I, M)
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#endif
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#endif // CALLABLE_METHOD_POINTER_H
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