/*************************************************************************/ /* method_bind.h */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2022 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 METHOD_BIND_H #define METHOD_BIND_H #include "core/list.h" #include "core/method_ptrcall.h" #include "core/object.h" #include "core/variant.h" #include <stdio.h> #ifdef DEBUG_ENABLED #define DEBUG_METHODS_ENABLED #endif #include "core/type_info.h" enum MethodFlags { METHOD_FLAG_NORMAL = 1, METHOD_FLAG_EDITOR = 2, METHOD_FLAG_NOSCRIPT = 4, METHOD_FLAG_CONST = 8, METHOD_FLAG_REVERSE = 16, // used for events METHOD_FLAG_VIRTUAL = 32, METHOD_FLAG_FROM_SCRIPT = 64, METHOD_FLAG_VARARG = 128, METHOD_FLAGS_DEFAULT = METHOD_FLAG_NORMAL, }; template <class T> struct VariantCaster { static _FORCE_INLINE_ T cast(const Variant &p_variant) { return p_variant; } }; template <class T> struct VariantCaster<T &> { static _FORCE_INLINE_ T cast(const Variant &p_variant) { return p_variant; } }; template <class T> struct VariantCaster<const T &> { static _FORCE_INLINE_ T cast(const Variant &p_variant) { return p_variant; } }; #define _VC(m_idx) \ (VariantCaster<P##m_idx>::cast((m_idx - 1) >= p_arg_count ? get_default_argument(m_idx - 1) : *p_args[m_idx - 1])) #ifdef PTRCALL_ENABLED #define VARIANT_ENUM_CAST(m_enum) \ MAKE_ENUM_TYPE_INFO(m_enum) \ template <> \ struct VariantCaster<m_enum> { \ static _FORCE_INLINE_ m_enum cast(const Variant &p_variant) { \ return (m_enum)p_variant.operator int(); \ } \ }; \ template <> \ struct PtrToArg<m_enum> { \ _FORCE_INLINE_ static m_enum convert(const void *p_ptr) { \ return m_enum(*reinterpret_cast<const int *>(p_ptr)); \ } \ _FORCE_INLINE_ static void encode(m_enum p_val, const void *p_ptr) { \ *(int *)p_ptr = p_val; \ } \ }; #else #define VARIANT_ENUM_CAST(m_enum) \ MAKE_ENUM_TYPE_INFO(m_enum) \ template <> \ struct VariantCaster<m_enum> { \ static _FORCE_INLINE_ m_enum cast(const Variant &p_variant) { \ return (m_enum)p_variant.operator int(); \ } \ }; #endif // Object enum casts must go here VARIANT_ENUM_CAST(Object::ConnectFlags); template <typename T> struct VariantObjectClassChecker { static _FORCE_INLINE_ bool check(const Variant &p_variant) { return true; } }; template <> struct VariantObjectClassChecker<Node *> { static _FORCE_INLINE_ bool check(const Variant &p_variant) { Object *obj = p_variant; Node *node = p_variant; return node || !obj; } }; template <> struct VariantObjectClassChecker<Control *> { static _FORCE_INLINE_ bool check(const Variant &p_variant) { Object *obj = p_variant; Control *control = p_variant; return control || !obj; } }; #define CHECK_ARG(m_arg) \ if ((m_arg - 1) < p_arg_count) { \ Variant::Type argtype = get_argument_type(m_arg - 1); \ if (!Variant::can_convert_strict(p_args[m_arg - 1]->get_type(), argtype) || \ !VariantObjectClassChecker<P##m_arg>::check(*p_args[m_arg - 1])) { \ r_error.error = Variant::CallError::CALL_ERROR_INVALID_ARGUMENT; \ r_error.argument = m_arg - 1; \ r_error.expected = argtype; \ return Variant(); \ } \ } #define CHECK_NOARG(m_arg) \ { \ if (p_arg##m_arg.get_type() != Variant::NIL) { \ if (r_argerror) \ *r_argerror = (m_arg - 1); \ return CALL_ERROR_EXTRA_ARGUMENT; \ } \ } // some helpers VARIANT_ENUM_CAST(Vector3::Axis); VARIANT_ENUM_CAST(Error); VARIANT_ENUM_CAST(Margin); VARIANT_ENUM_CAST(Corner); VARIANT_ENUM_CAST(Orientation); VARIANT_ENUM_CAST(HAlign); VARIANT_ENUM_CAST(VAlign); VARIANT_ENUM_CAST(PropertyHint); VARIANT_ENUM_CAST(PropertyUsageFlags); VARIANT_ENUM_CAST(MethodFlags); VARIANT_ENUM_CAST(Variant::Type); VARIANT_ENUM_CAST(Variant::Operator); template <> struct VariantCaster<wchar_t> { static _FORCE_INLINE_ wchar_t cast(const Variant &p_variant) { return (wchar_t)p_variant.operator int(); } }; #ifdef PTRCALL_ENABLED template <> struct PtrToArg<wchar_t> { _FORCE_INLINE_ static wchar_t convert(const void *p_ptr) { return wchar_t(*reinterpret_cast<const int *>(p_ptr)); } _FORCE_INLINE_ static void encode(wchar_t p_val, const void *p_ptr) { *(int *)p_ptr = p_val; } }; #endif class MethodBind { int method_id; uint32_t hint_flags; StringName name; Vector<Variant> default_arguments; int default_argument_count; int argument_count; bool _const; bool _returns; protected: Variant::Type *argument_types; #ifdef DEBUG_METHODS_ENABLED Vector<StringName> arg_names; #endif void _set_const(bool p_const); void _set_returns(bool p_returns); virtual Variant::Type _gen_argument_type(int p_arg) const = 0; virtual PropertyInfo _gen_argument_type_info(int p_arg) const = 0; void _generate_argument_types(int p_count); void set_argument_count(int p_count) { argument_count = p_count; } public: Vector<Variant> get_default_arguments() const { return default_arguments; } _FORCE_INLINE_ int get_default_argument_count() const { return default_argument_count; } _FORCE_INLINE_ Variant has_default_argument(int p_arg) const { int idx = argument_count - p_arg - 1; if (idx < 0 || idx >= default_arguments.size()) { return false; } else { return true; } } _FORCE_INLINE_ Variant get_default_argument(int p_arg) const { int idx = argument_count - p_arg - 1; if (idx < 0 || idx >= default_arguments.size()) { return Variant(); } else { return default_arguments[idx]; } } _FORCE_INLINE_ Variant::Type get_argument_type(int p_argument) const { ERR_FAIL_COND_V(p_argument < -1 || p_argument > argument_count, Variant::NIL); return argument_types[p_argument + 1]; } PropertyInfo get_argument_info(int p_argument) const; PropertyInfo get_return_info() const; #ifdef DEBUG_METHODS_ENABLED void set_argument_names(const Vector<StringName> &p_names); //set by class, db, can't be inferred otherwise Vector<StringName> get_argument_names() const; virtual GodotTypeInfo::Metadata get_argument_meta(int p_arg) const = 0; #endif void set_hint_flags(uint32_t p_hint) { hint_flags = p_hint; } uint32_t get_hint_flags() const { return hint_flags | (is_const() ? METHOD_FLAG_CONST : 0) | (is_vararg() ? METHOD_FLAG_VARARG : 0); } virtual String get_instance_class() const = 0; _FORCE_INLINE_ int get_argument_count() const { return argument_count; }; virtual Variant call(Object *p_object, const Variant **p_args, int p_arg_count, Variant::CallError &r_error) = 0; #ifdef PTRCALL_ENABLED virtual void ptrcall(Object *p_object, const void **p_args, void *r_ret) = 0; #endif StringName get_name() const; void set_name(const StringName &p_name); _FORCE_INLINE_ int get_method_id() const { return method_id; } _FORCE_INLINE_ bool is_const() const { return _const; } _FORCE_INLINE_ bool has_return() const { return _returns; } virtual bool is_vararg() const { return false; } void set_default_arguments(const Vector<Variant> &p_defargs); MethodBind(); virtual ~MethodBind(); }; template <class T> class MethodBindVarArg : public MethodBind { public: typedef Variant (T::*NativeCall)(const Variant **, int, Variant::CallError &); protected: NativeCall call_method; MethodInfo arguments; public: virtual PropertyInfo _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, "arg_" + itos(p_arg), PROPERTY_HINT_NONE, String(), PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NIL_IS_VARIANT); } } virtual Variant::Type _gen_argument_type(int p_arg) const { return _gen_argument_type_info(p_arg).type; } #ifdef DEBUG_METHODS_ENABLED virtual GodotTypeInfo::Metadata get_argument_meta(int) const { return GodotTypeInfo::METADATA_NONE; } #endif virtual Variant call(Object *p_object, const Variant **p_args, int p_arg_count, Variant::CallError &r_error) { T *instance = static_cast<T *>(p_object); return (instance->*call_method)(p_args, p_arg_count, r_error); } void set_method_info(const MethodInfo &p_info, bool p_return_nil_is_variant) { set_argument_count(p_info.arguments.size()); Variant::Type *at = memnew_arr(Variant::Type, p_info.arguments.size() + 1); at[0] = p_info.return_val.type; if (p_info.arguments.size()) { #ifdef DEBUG_METHODS_ENABLED Vector<StringName> names; names.resize(p_info.arguments.size()); #endif for (int i = 0; i < p_info.arguments.size(); i++) { at[i + 1] = p_info.arguments[i].type; #ifdef DEBUG_METHODS_ENABLED names.write[i] = p_info.arguments[i].name; #endif } #ifdef DEBUG_METHODS_ENABLED set_argument_names(names); #endif } argument_types = at; arguments = p_info; if (p_return_nil_is_variant) { arguments.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT; } } #ifdef PTRCALL_ENABLED virtual void ptrcall(Object *p_object, const void **p_args, void *r_ret) { ERR_FAIL(); //can't call } //todo #endif void set_method(NativeCall p_method) { call_method = p_method; } virtual bool is_const() const { return false; } virtual String get_instance_class() const { return T::get_class_static(); } virtual bool is_vararg() const { return true; } MethodBindVarArg() { call_method = nullptr; _set_returns(true); } }; template <class T> MethodBind *create_vararg_method_bind(Variant (T::*p_method)(const Variant **, int, Variant::CallError &), 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); return a; } /** This amazing hack is based on the FastDelegates theory */ // tale of an amazing hack.. // // if you declare a nonexistent class.. class __UnexistingClass; #include "method_bind.gen.inc" #endif // METHOD_BIND_H