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godot/core/method_bind.h
Hein-Pieter van Braam 0e29f7974b Reduce unnecessary COW on Vector by make writing explicit 
This commit makes operator[] on Vector const and adds a write proxy to it.  From
now on writes to Vectors need to happen through the .write proxy. So for
instance:

Vector<int> vec;
vec.push_back(10);
std::cout << vec[0] << std::endl;
vec.write[0] = 20;

Failing to use the .write proxy will cause a compilation error.

In addition COWable datatypes can now embed a CowData pointer to their data.
This means that String, CharString, and VMap no longer use or derive from
Vector.

_ALWAYS_INLINE_ and _FORCE_INLINE_ are now equivalent for debug and non-debug
builds. This is a lot faster for Vector in the editor and while running tests.
The reason why this difference used to exist is because force-inlined methods
used to give a bad debugging experience. After extensive testing with modern
compilers this is no longer the case.
2018-07-26 00:54:16 +02:00

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/*************************************************************************/
/* method_bind.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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 "list.h"
#include "method_ptrcall.h"
#include "object.h"
#include "variant.h"
#include <stdio.h>
/**
@author Juan Linietsky <reduzio@gmail.com>
*/
#ifdef DEBUG_ENABLED
#define DEBUG_METHODS_ENABLED
#endif
#include "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:
#ifdef DEBUG_METHODS_ENABLED
Variant::Type *argument_types;
Vector<StringName> arg_names;
#endif
void _set_const(bool p_const);
void _set_returns(bool p_returns);
#ifdef DEBUG_METHODS_ENABLED
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);
#endif
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];
}
#ifdef DEBUG_METHODS_ENABLED
_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;
void set_argument_names(const Vector<StringName> &p_names); //set by class, db, can't be inferred otherwise
Vector<StringName> get_argument_names() const;
#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;
#ifdef DEBUG_METHODS_ENABLED
MethodInfo arguments;
#endif
public:
#ifdef DEBUG_METHODS_ENABLED
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;
}
#else
virtual Variant::Type _gen_argument_type(int p_arg) const {
return Variant::NIL;
}
#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) {
set_argument_count(p_info.arguments.size());
#ifdef DEBUG_METHODS_ENABLED
Variant::Type *at = memnew_arr(Variant::Type, p_info.arguments.size() + 1);
at[0] = p_info.return_val.type;
if (p_info.arguments.size()) {
Vector<StringName> names;
names.resize(p_info.arguments.size());
for (int i = 0; i < p_info.arguments.size(); i++) {
at[i + 1] = p_info.arguments[i].type;
names.write[i] = p_info.arguments[i].name;
}
set_argument_names(names);
}
argument_types = at;
arguments = p_info;
arguments.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
#endif
}
#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 = NULL;
_set_returns(true);
}
};
template <class T>
MethodBind *create_vararg_method_bind(Variant (T::*p_method)(const Variant **, int, Variant::CallError &), const MethodInfo &p_info) {
MethodBindVarArg<T> *a = memnew((MethodBindVarArg<T>));
a->set_method(p_method);
a->set_method_info(p_info);
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
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