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godot/core/variant.h
Pedro J. Estébanez d904d05e65 Fix dangling and reassigned Variants 
This commit addresses multiple issues with `Variant`s that point to an `Object`
which is later released, when it's tried to be accessed again.

Formerly, **while running on the debugger the system would check if the instance id was
still valid** to print warnings or return special values. Some cases weren't being
warned about whatsoever.

Also, a newly allocated `Object` could happen to be allocated at the same memory
address of an old one, making cases of use hard to find and having **`Variant`s pointing
to the old one magically reassigned to the new**.

This commit makes the engine realize all these situations **under debugging**
so you can detect and fix them. Running without a debugger attached will still
behave as it always did.

Also the warning messages have been extended and made clearer.

All that said, in the name of performance there's still one possible case of undefined
behavior: in multithreaded scripts there would be a race condition between a thread freeing
an `Object` and another one trying to operate on it. The latter may not realize the
`Object` has been freed soon enough. But that's a case of bad scripting that was never
supported anyway.
2020-04-23 13:51:02 +02:00

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/*************************************************************************/
/* variant.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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 VARIANT_H
#define VARIANT_H
#include "core/array.h"
#include "core/color.h"
#include "core/dictionary.h"
#include "core/io/ip_address.h"
#include "core/math/aabb.h"
#include "core/math/basis.h"
#include "core/math/face3.h"
#include "core/math/plane.h"
#include "core/math/quat.h"
#include "core/math/transform.h"
#include "core/math/transform_2d.h"
#include "core/math/vector3.h"
#include "core/node_path.h"
#include "core/object_id.h"
#include "core/pool_vector.h"
#include "core/ref_ptr.h"
#include "core/rid.h"
#include "core/ustring.h"
class Object;
class ObjectRC;
class Node; // helper
class Control; // helper
struct PropertyInfo;
struct MethodInfo;
typedef PoolVector<uint8_t> PoolByteArray;
typedef PoolVector<int> PoolIntArray;
typedef PoolVector<real_t> PoolRealArray;
typedef PoolVector<String> PoolStringArray;
typedef PoolVector<Vector2> PoolVector2Array;
typedef PoolVector<Vector3> PoolVector3Array;
typedef PoolVector<Color> PoolColorArray;
// Temporary workaround until c++11 alignas()
#ifdef __GNUC__
#define GCC_ALIGNED_8 __attribute__((aligned(8)))
#else
#define GCC_ALIGNED_8
#endif
#ifdef DEBUG_ENABLED
// Ideally, an inline member of ObjectRC, but would cause circular includes
#define _OBJ_PTR(m_variant) ((m_variant)._get_obj().rc ? (m_variant)._get_obj().rc->get_ptr() : reinterpret_cast<Ref<Reference> *>((m_variant)._get_obj().ref.get_data())->ptr())
#else
#define _OBJ_PTR(m_variant) ((m_variant)._get_obj().obj)
#endif
class Variant {
public:
// If this changes the table in variant_op must be updated
enum Type {
NIL,
// atomic types
BOOL,
INT,
REAL,
STRING,
// math types
VECTOR2, // 5
RECT2,
VECTOR3,
TRANSFORM2D,
PLANE,
QUAT, // 10
AABB,
BASIS,
TRANSFORM,
// misc types
COLOR,
NODE_PATH, // 15
_RID,
OBJECT,
DICTIONARY,
ARRAY,
// arrays
POOL_BYTE_ARRAY, // 20
POOL_INT_ARRAY,
POOL_REAL_ARRAY,
POOL_STRING_ARRAY,
POOL_VECTOR2_ARRAY,
POOL_VECTOR3_ARRAY, // 25
POOL_COLOR_ARRAY,
VARIANT_MAX
};
private:
friend struct _VariantCall;
// Variant takes 20 bytes when real_t is float, and 36 if double
// it only allocates extra memory for aabb/matrix.
Type type;
struct ObjData {
#ifdef DEBUG_ENABLED
// Will be null for every type deriving from Reference as they have their
// own reference count mechanism
ObjectRC *rc;
// This is for allowing debug build to check for instance ID validity,
// so warnings are shown in debug builds when a stray Variant (one pointing
// to a released Object) would have happened.
// If it's zero, that means the Variant is has a legit null object value,
// thus not needing instance id validation.
ObjectID instance_id;
#else
Object *obj;
#endif
// Always initialized, but will be null if the Ref<> assigned was null
// or this Variant is not even holding a Reference-derived object
RefPtr ref;
};
_FORCE_INLINE_ ObjData &_get_obj();
_FORCE_INLINE_ const ObjData &_get_obj() const;
union {
bool _bool;
int64_t _int;
double _real;
Transform2D *_transform2d;
::AABB *_aabb;
Basis *_basis;
Transform *_transform;
void *_ptr; //generic pointer
uint8_t _mem[sizeof(ObjData) > (sizeof(real_t) * 4) ? sizeof(ObjData) : (sizeof(real_t) * 4)];
} _data GCC_ALIGNED_8;
void reference(const Variant &p_variant);
void clear();
public:
_FORCE_INLINE_ Type get_type() const { return type; }
static String get_type_name(Variant::Type p_type);
static bool can_convert(Type p_type_from, Type p_type_to);
static bool can_convert_strict(Type p_type_from, Type p_type_to);
bool is_ref() const;
_FORCE_INLINE_ bool is_num() const { return type == INT || type == REAL; };
_FORCE_INLINE_ bool is_array() const { return type >= ARRAY; };
bool is_shared() const;
bool is_zero() const;
bool is_one() const;
operator bool() const;
operator signed int() const;
operator unsigned int() const; // this is the real one
operator signed short() const;
operator unsigned short() const;
operator signed char() const;
operator unsigned char() const;
//operator long unsigned int() const;
operator int64_t() const;
operator uint64_t() const;
#ifdef NEED_LONG_INT
operator signed long() const;
operator unsigned long() const;
#endif
operator CharType() const;
operator float() const;
operator double() const;
operator String() const;
operator StringName() const;
operator Vector2() const;
operator Rect2() const;
operator Vector3() const;
operator Plane() const;
operator ::AABB() const;
operator Quat() const;
operator Basis() const;
operator Transform() const;
operator Transform2D() const;
operator Color() const;
operator NodePath() const;
operator RefPtr() const;
operator RID() const;
operator Object *() const;
operator Node *() const;
operator Control *() const;
operator Dictionary() const;
operator Array() const;
operator PoolVector<uint8_t>() const;
operator PoolVector<int>() const;
operator PoolVector<real_t>() const;
operator PoolVector<String>() const;
operator PoolVector<Vector3>() const;
operator PoolVector<Color>() const;
operator PoolVector<Plane>() const;
operator PoolVector<Face3>() const;
operator Vector<Variant>() const;
operator Vector<uint8_t>() const;
operator Vector<int>() const;
operator Vector<real_t>() const;
operator Vector<String>() const;
operator Vector<StringName>() const;
operator Vector<Vector3>() const;
operator Vector<Color>() const;
operator Vector<RID>() const;
operator Vector<Vector2>() const;
operator PoolVector<Vector2>() const;
operator Vector<Plane>() const;
// some core type enums to convert to
operator Margin() const;
operator Orientation() const;
operator IP_Address() const;
Variant(bool p_bool);
Variant(signed int p_int); // real one
Variant(unsigned int p_int);
#ifdef NEED_LONG_INT
Variant(signed long p_long); // real one
Variant(unsigned long p_long);
//Variant(long unsigned int p_long);
#endif
Variant(signed short p_short); // real one
Variant(unsigned short p_short);
Variant(signed char p_char); // real one
Variant(unsigned char p_char);
Variant(int64_t p_int); // real one
Variant(uint64_t p_int);
Variant(float p_float);
Variant(double p_double);
Variant(const String &p_string);
Variant(const StringName &p_string);
Variant(const char *const p_cstring);
Variant(const CharType *p_wstring);
Variant(const Vector2 &p_vector2);
Variant(const Rect2 &p_rect2);
Variant(const Vector3 &p_vector3);
Variant(const Plane &p_plane);
Variant(const ::AABB &p_aabb);
Variant(const Quat &p_quat);
Variant(const Basis &p_matrix);
Variant(const Transform2D &p_transform);
Variant(const Transform &p_transform);
Variant(const Color &p_color);
Variant(const NodePath &p_node_path);
Variant(const RefPtr &p_resource);
Variant(const RID &p_rid);
Variant(const Object *p_object);
Variant(const Dictionary &p_dictionary);
Variant(const Array &p_array);
Variant(const PoolVector<Plane> &p_array); // helper
Variant(const PoolVector<uint8_t> &p_raw_array);
Variant(const PoolVector<int> &p_int_array);
Variant(const PoolVector<real_t> &p_real_array);
Variant(const PoolVector<String> &p_string_array);
Variant(const PoolVector<Vector3> &p_vector3_array);
Variant(const PoolVector<Color> &p_color_array);
Variant(const PoolVector<Face3> &p_face_array);
Variant(const Vector<Variant> &p_array);
Variant(const Vector<uint8_t> &p_array);
Variant(const Vector<int> &p_array);
Variant(const Vector<real_t> &p_array);
Variant(const Vector<String> &p_array);
Variant(const Vector<StringName> &p_array);
Variant(const Vector<Vector3> &p_array);
Variant(const Vector<Color> &p_array);
Variant(const Vector<Plane> &p_array); // helper
Variant(const Vector<RID> &p_array); // helper
Variant(const Vector<Vector2> &p_array); // helper
Variant(const PoolVector<Vector2> &p_vector2_array); // helper
Variant(const IP_Address &p_address);
// If this changes the table in variant_op must be updated
enum Operator {
//comparison
OP_EQUAL,
OP_NOT_EQUAL,
OP_LESS,
OP_LESS_EQUAL,
OP_GREATER,
OP_GREATER_EQUAL,
//mathematic
OP_ADD,
OP_SUBTRACT,
OP_MULTIPLY,
OP_DIVIDE,
OP_NEGATE,
OP_POSITIVE,
OP_MODULE,
OP_STRING_CONCAT,
//bitwise
OP_SHIFT_LEFT,
OP_SHIFT_RIGHT,
OP_BIT_AND,
OP_BIT_OR,
OP_BIT_XOR,
OP_BIT_NEGATE,
//logic
OP_AND,
OP_OR,
OP_XOR,
OP_NOT,
//containment
OP_IN,
OP_MAX
};
static String get_operator_name(Operator p_op);
static void evaluate(const Operator &p_op, const Variant &p_a, const Variant &p_b, Variant &r_ret, bool &r_valid);
static _FORCE_INLINE_ Variant evaluate(const Operator &p_op, const Variant &p_a, const Variant &p_b) {
bool valid = true;
Variant res;
evaluate(p_op, p_a, p_b, res, valid);
return res;
}
void zero();
Variant duplicate(bool deep = false) const;
static void blend(const Variant &a, const Variant &b, float c, Variant &r_dst);
static void interpolate(const Variant &a, const Variant &b, float c, Variant &r_dst);
struct CallError {
enum Error {
CALL_OK,
CALL_ERROR_INVALID_METHOD,
CALL_ERROR_INVALID_ARGUMENT,
CALL_ERROR_TOO_MANY_ARGUMENTS,
CALL_ERROR_TOO_FEW_ARGUMENTS,
CALL_ERROR_INSTANCE_IS_NULL,
};
Error error;
int argument;
Type expected;
};
void call_ptr(const StringName &p_method, const Variant **p_args, int p_argcount, Variant *r_ret, CallError &r_error);
Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, CallError &r_error);
Variant call(const StringName &p_method, const Variant &p_arg1 = Variant(), const Variant &p_arg2 = Variant(), const Variant &p_arg3 = Variant(), const Variant &p_arg4 = Variant(), const Variant &p_arg5 = Variant());
static String get_call_error_text(Object *p_base, const StringName &p_method, const Variant **p_argptrs, int p_argcount, const Variant::CallError &ce);
static Variant construct(const Variant::Type, const Variant **p_args, int p_argcount, CallError &r_error, bool p_strict = true);
void get_method_list(List<MethodInfo> *p_list) const;
bool has_method(const StringName &p_method) const;
static Vector<Variant::Type> get_method_argument_types(Variant::Type p_type, const StringName &p_method);
static Vector<Variant> get_method_default_arguments(Variant::Type p_type, const StringName &p_method);
static Variant::Type get_method_return_type(Variant::Type p_type, const StringName &p_method, bool *r_has_return = NULL);
static Vector<StringName> get_method_argument_names(Variant::Type p_type, const StringName &p_method);
static bool is_method_const(Variant::Type p_type, const StringName &p_method);
void set_named(const StringName &p_index, const Variant &p_value, bool *r_valid = NULL);
Variant get_named(const StringName &p_index, bool *r_valid = NULL) const;
void set(const Variant &p_index, const Variant &p_value, bool *r_valid = NULL);
Variant get(const Variant &p_index, bool *r_valid = NULL) const;
bool in(const Variant &p_index, bool *r_valid = NULL) const;
bool iter_init(Variant &r_iter, bool &r_valid) const;
bool iter_next(Variant &r_iter, bool &r_valid) const;
Variant iter_get(const Variant &r_iter, bool &r_valid) const;
void get_property_list(List<PropertyInfo> *p_list) const;
//argsVariant call()
bool operator==(const Variant &p_variant) const;
bool operator!=(const Variant &p_variant) const;
bool operator<(const Variant &p_variant) const;
uint32_t hash() const;
bool hash_compare(const Variant &p_variant) const;
bool booleanize() const;
String stringify(List<const void *> &stack) const;
void static_assign(const Variant &p_variant);
static void get_constructor_list(Variant::Type p_type, List<MethodInfo> *p_list);
static void get_constants_for_type(Variant::Type p_type, List<StringName> *p_constants);
static bool has_constant(Variant::Type p_type, const StringName &p_value);
static Variant get_constant_value(Variant::Type p_type, const StringName &p_value, bool *r_valid = NULL);
typedef String (*ObjectDeConstruct)(const Variant &p_object, void *ud);
typedef void (*ObjectConstruct)(const String &p_text, void *ud, Variant &r_value);
String get_construct_string() const;
static void construct_from_string(const String &p_string, Variant &r_value, ObjectConstruct p_obj_construct = NULL, void *p_construct_ud = NULL);
void operator=(const Variant &p_variant); // only this is enough for all the other types
Variant(const Variant &p_variant);
_FORCE_INLINE_ Variant() { type = NIL; }
_FORCE_INLINE_ ~Variant() {
if (type != Variant::NIL) clear();
}
};
//typedef Dictionary Dictionary; no
//typedef Array Array;
Vector<Variant> varray();
Vector<Variant> varray(const Variant &p_arg1);
Vector<Variant> varray(const Variant &p_arg1, const Variant &p_arg2);
Vector<Variant> varray(const Variant &p_arg1, const Variant &p_arg2, const Variant &p_arg3);
Vector<Variant> varray(const Variant &p_arg1, const Variant &p_arg2, const Variant &p_arg3, const Variant &p_arg4);
Vector<Variant> varray(const Variant &p_arg1, const Variant &p_arg2, const Variant &p_arg3, const Variant &p_arg4, const Variant &p_arg5);
struct VariantHasher {
static _FORCE_INLINE_ uint32_t hash(const Variant &p_variant) { return p_variant.hash(); }
};
struct VariantComparator {
static _FORCE_INLINE_ bool compare(const Variant &p_lhs, const Variant &p_rhs) { return p_lhs.hash_compare(p_rhs); }
};
Variant::ObjData &Variant::_get_obj() {
return *reinterpret_cast<ObjData *>(&_data._mem[0]);
}
const Variant::ObjData &Variant::_get_obj() const {
return *reinterpret_cast<const ObjData *>(&_data._mem[0]);
}
String vformat(const String &p_text, const Variant &p1 = Variant(), const Variant &p2 = Variant(), const Variant &p3 = Variant(), const Variant &p4 = Variant(), const Variant &p5 = Variant());
#endif
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