/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#ifndef OBJFWRT_OBJFWRT_H
#define OBJFWRT_OBJFWRT_H
#ifndef __STDC_LIMIT_MACROS
# define __STDC_LIMIT_MACROS
#endif
#ifndef __STDC_CONSTANT_MACROS
# define __STDC_CONSTANT_MACROS
#endif
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/** @file */
#ifndef __has_feature
# define __has_feature(x) 0
#endif
#ifndef __has_attribute
# define __has_attribute(x) 0
#endif
#if !__has_feature(nullability)
# ifndef _Nonnull
# define _Nonnull
# endif
# ifndef _Nullable
# define _Nullable
# endif
# ifndef _Null_unspecified
# define _Null_unspecified
# endif
#endif
#if !__has_feature(objc_arc) && !defined(__unsafe_unretained)
# define __unsafe_unretained
#endif
/**
* @brief A value representing no class.
*/
#define Nil (Class _Null_unspecified)0
/**
* @brief A value representing no object.
*/
#define nil (id _Null_unspecified)0
/**
* @brief An Objective-C boolean representing true.
*
* @note This is a legacy from before C had a boolean type. Prefer the standard
* C99 true instead!
*/
#define YES true
/**
* @brief An Objective-C boolean representing false.
*
* @note This is a legacy from before C had a boolean type. Prefer the standard
* C99 false instead!
*/
#define NO false
/**
* @brief A pointer to a class.
*/
typedef struct objc_class *Class;
/**
* @brief A pointer to any object.
*/
typedef struct objc_object *id;
/**
* @brief A selector.
*
* A selector is the name of a method including the colons and an optional type
* encoding.
*/
typedef const struct objc_selector *SEL;
/**
* @brief A method.
*
* A method consists of a selector with a type encoding and an implementation.
*/
typedef const struct objc_method *Method;
/**
* @brief A protocol.
*/
#if defined(__OBJC__) && !defined(DOXYGEN)
@class Protocol;
#else
typedef const struct objc_protocol *Protocol;
#endif
/**
* @brief An instance variable.
*/
typedef const struct objc_ivar *Ivar;
/**
* @brief A property.
*/
typedef const struct objc_property *objc_property_t;
#if !defined(__wii__) && !defined(__amigaos__)
/**
* @brief An Objective-C boolean. Either @ref YES or @ref NO.
*
* @note This is a legacy from before C had a boolean type. Prefer the standard
* C99 bool instead!
*/
typedef bool BOOL;
#endif
/**
* @brief A method implementation.
*
* @param object The messaged object
* @param selector The selector sent
*/
typedef id _Nullable (*IMP)(id _Nonnull object, SEL _Nonnull selector, ...);
/**
* @brief A handler for uncaught exceptions.
*
* @param exception The exception which was not caught.
*/
typedef void (*objc_uncaught_exception_handler)(id _Nullable exception);
/**
* @brief A handler for mutation during enumeration.
*
* @param object The object that was mutated during enumeration
*/
typedef void (*objc_enumeration_mutation_handler)(id _Nonnull object);
/**
* @brief A struct representing a call to super.
*/
struct objc_super {
/**
* @brief The object on which to perform the super call.
*/
id __unsafe_unretained _Nullable self;
/**
* @brief The class from which to take the method.
*/
#ifdef __cplusplus
Class _Nonnull class_;
#else
Class _Nonnull class;
#endif
};
/**
* @brief A policy for object association, see @ref objc_setAssociatedObject.
*/
typedef enum objc_associationPolicy {
/** @brief Associate the object like an assigned property. */
OBJC_ASSOCIATION_ASSIGN = 0,
/** @brief Associate the object like a retained, nonatomic property. */
OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1,
/** @brief Associate the object like a retained property. */
OBJC_ASSOCIATION_RETAIN = OBJC_ASSOCIATION_RETAIN_NONATOMIC | 0x300,
/** @brief Associate the object like a copied, nonatomic property. */
OBJC_ASSOCIATION_COPY_NONATOMIC = 3,
/** @brief Associate the object like a copied property. */
OBJC_ASSOCIATION_COPY = OBJC_ASSOCIATION_COPY_NONATOMIC | 0x300
} objc_associationPolicy;
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Registers a selector with the specified name with the runtime.
*
* @param name The name for the selector to register
* @return The registered selector
*/
extern SEL _Nonnull sel_registerName(const char *_Nonnull name);
/**
* @brief Returns the name of the specified selector.
*
* @param selector The selector whose name should be returned
* @return The name of the specified selector
*/
extern const char *_Nonnull sel_getName(SEL _Nonnull selector);
/**
* @brief Checks two selectors for equality.
*
* Selectors are considered equal if they have the same name - any type
* encoding is ignored.
*
* @param selector1 The first selector
* @param selector2 The second selector
* @return Whether the two selectors are equal
*/
extern bool sel_isEqual(SEL _Nonnull selector1, SEL _Nonnull selector2);
/**
* @brief Allocates a new class and its metaclass.
*
* @param superclass The superclass for the new class
* @param name The name for the new class
* @param extraBytes Extra bytes to add to the instance size
* @return A new, unregistered class pair
*/
extern Class _Nonnull objc_allocateClassPair(Class _Nullable superclass,
const char *_Nonnull name, size_t extraBytes);
/**
* @brief Registers an already allocated class pair.
*
* @param class_ The class pair to register
*/
extern void objc_registerClassPair(Class _Nonnull class_);
/**
* @brief Gets the list of all classes known to the runtime.
*
* @param buffer An array of Class to write to. If the buffer does not have
* enough space, the result is truncated.
* @param count The number of classes for which there is space in `buffer`
* @return The number of classes written
*/
extern unsigned int objc_getClassList(Class _Nonnull *_Nullable buffer,
unsigned int count);
/**
* @brief Copies the list of all classes known to the runtime.
*
* This is like @ref objc_getClassList, but allocates a buffer large enough for
* all classes.
*
* @param length An optional pointer to an `unsigned int` that will be set to
* the number of classes returned
* @return An array of classes, terminated by `Nil`. You need to call `free()`
* on it when done.
*/
extern Class _Nonnull *_Nonnull objc_copyClassList(
unsigned int *_Nullable length);
/**
* @brief Returns whether the specified class is a metaclass.
*
* @param class_ The class which should be examined
* @return Whether the specified class is a metaclass
*/
extern bool class_isMetaClass(Class _Nullable class_);
/**
* @brief Returns the name of the specified class.
*
* @param class_ The class whose name should be returned
* @return The name of the specified class
*/
extern const char *_Nullable class_getName(Class _Nullable class_);
/**
* @brief Returns the superclass of the specified class.
*
* @param class_ The class whose superclass should be returned
* @return The superclass of the specified class
*/
extern Class _Nullable class_getSuperclass(Class _Nullable class_);
/**
* @brief Returns the instance size of the specified class.
*
* @param class_ The class whose instance size should be returned
* @return The instance size of the specified class
*/
extern unsigned long class_getInstanceSize(Class _Nullable class_);
/**
* @brief Returns whether the specified class responds to the specified
* selector.
*
* @param class_ The class which should be examined
* @param selector The selector which should be checked
* @return Whether the specified class responds to the specified selector
*/
extern bool class_respondsToSelector(Class _Nullable class_,
SEL _Nonnull selector);
/**
* @brief Returns whether the specified class conforms to the specified
* protocol.
*
* @param class_ The class which should be examined
* @param protocol The protocol for which conformance should be checked
* @return Whether the specified class conforms to the specified protocol
*/
extern bool class_conformsToProtocol(Class _Nullable class_,
Protocol *_Nonnull protocol);
/**
* @brief Returns the class's method implementation for the specified selector.
*
* @warning If the method uses the struct return ABI, you need to use
* @ref class_getMethodImplementation_stret instead! Depending on the
* ABI, small structs might not use the struct return ABI.
*
* @param class_ The class whose method implementation should be returned
* @param selector The selector for the method whose implementation should be
* returned
* @return The class's method implementation for the specified selector
*/
extern IMP _Nullable class_getMethodImplementation(Class _Nullable class_,
SEL _Nonnull selector);
/**
* @brief Returns the class's method implementation for the specified selector.
*
* @warning If the method does not use use the struct return ABI, you need to
* use @ref class_getMethodImplementation instead! Depending on the
* ABI, small structs might not use the struct return ABI.
*
* @param class_ The class whose method implementation should be returned
* @param selector The selector for the method whose implementation should be
* returned
* @return The class's method implementation for the specified selector
*/
extern IMP _Nullable class_getMethodImplementation_stret(Class _Nullable class_,
SEL _Nonnull selector);
/**
* @brief Returns the class's instance method for the specified selector
*
* @param class_ The class whose instance method should be returned
* @param selector The selector of the instance method to return
* @return The class's instance method for the specified selector
*/
extern Method _Nullable class_getInstanceMethod(Class _Nullable class_,
SEL _Nonnull selector);
/**
* @brief Adds the specified method to the class.
*
* @param class_ The class to which to add the method
* @param selector The selector for the method to add
* @param implementation The implementation of the method to add
* @param typeEncoding The type encoding of the method to add
* @return Whether the specified method was added
*/
extern bool class_addMethod(Class _Nonnull class_, SEL _Nonnull selector,
IMP _Nonnull implementation, const char *_Nullable typeEncoding);
/**
* @brief Replaces or adds the specified method of the class.
*
* @param class_ The class to which to replace the method
* @param selector The selector for the method to replace
* @param implementation The implementation of the method to replace
* @param typeEncoding The type encoding of the method to replace. Only used if
* the method does not exist yet.
* @return The old implementation of the method
*/
extern IMP _Nullable class_replaceMethod(Class _Nonnull class_,
SEL _Nonnull selector, IMP _Nonnull implementation,
const char *_Nullable typeEncoding);
/**
* @brief Returns the object's class.
*
* @param object The object whose class should be returned
* @return The object's class
*/
extern Class _Nullable object_getClass(id _Nullable object);
/**
* @brief Sets the object's class.
*
* This can be used to swizzle an object's class.
*
* @param object The object whose class should be set
* @param class_ The new class for the object
* @return The old class of the object
*/
extern Class _Nullable object_setClass(id _Nullable object,
Class _Nonnull class_);
/**
* @brief Returns the object's class name.
*
* @param object The object whose class name should be returned
* @return The object's class name
*/
extern const char *_Nullable object_getClassName(id _Nullable object);
/**
* @brief Returns the name of the specified protocol.
*
* @param protocol The protocol whose name should be returned
* @return The name of the specified protocol
*/
extern const char *_Nonnull protocol_getName(Protocol *_Nonnull protocol);
/**
* @brief Returns whether two protocols are equal.
*
* @param protocol1 The first protocol
* @param protocol2 The second protocol
* @return Whether the two protocols are equal
*/
extern bool protocol_isEqual(Protocol *_Nonnull protocol1,
Protocol *_Nonnull protocol2);
/**
* @brief Returns whether the first protocol conforms to the second protocol.
*
* @param protocol1 The first protocol
* @param protocol2 The second protocol
* @return Whether the first protocol conforms to the second protocol
*/
extern bool protocol_conformsToProtocol(Protocol *_Nonnull protocol1,
Protocol *_Nonnull protocol2);
/**
* @brief Copies the method list of the specified class.
*
* @param class_ The class whose method list should be copied
* @param outCount An optional pointer to an `unsigned int` that should be set
* to the number of methods returned
* @return An array of methods, terminated by `NULL`. You need to call `free()`
* on it when done.
*/
extern Method _Nullable *_Nullable class_copyMethodList(Class _Nullable class_,
unsigned int *_Nullable outCount);
/**
* @brief Returns the name of the specified method.
*
* @param method The method whose name should be returned
* @return The name of the specified method
*/
extern SEL _Nonnull method_getName(Method _Nonnull method);
/**
* @brief Returns the type encoding of the specified method.
*
* @param method The method whose type encoding should be returned
* @return The type encoding of the specified method
*/
extern const char *_Nullable method_getTypeEncoding(Method _Nonnull method);
/**
* @brief Copies the instance variable list of the specified class.
*
* @param class_ The class whose instance variable list should be copied
* @param outCount An optional pointer to an `unsigned int` that should be set
* to the number of instance variables returned
* @return An array of instance variables, terminated by `NULL`. You need to
* call `free()` on it when done.
*/
extern Ivar _Nullable *_Nullable class_copyIvarList(Class _Nullable class_,
unsigned int *_Nullable outCount);
/**
* @brief Returns the name of the specified instance variable.
*
* @param ivar The instance variable whose name should be returned
* @return The name of the specified instance variable
*/
extern const char *_Nonnull ivar_getName(Ivar _Nonnull ivar);
/**
* @brief Returns the type encoding of the specified instance variable.
*
* @param ivar The instance variable whose type encoding should be returned
* @return The type encoding of the specified instance variable
*/
extern const char *_Nonnull ivar_getTypeEncoding(Ivar _Nonnull ivar);
/**
* @brief Returns the offset of the specified instance variable.
*
* @param ivar The instance variable whose offset should be returned
* @return The offset of the specified instance variable
*/
extern ptrdiff_t ivar_getOffset(Ivar _Nonnull ivar);
/**
* @brief Copies the property list of the specified class.
*
* @param class_ The class whose property list should be copied
* @param outCount An optional pointer to an `unsigned int` that should be set
* to the number of properties returned
* @return An array of properties, terminated by `NULL`. You need to call
* `free()` on it when done.
*/
extern objc_property_t _Nullable *_Nullable class_copyPropertyList(
Class _Nullable class_, unsigned int *_Nullable outCount);
/**
* @brief Returns the name of the specified property.
*
* @param property The property whose name should be returned
* @return The name of the specified property
*/
extern const char *_Nonnull property_getName(objc_property_t _Nonnull property);
/**
* @brief Copies the specified attribute value.
*
* @param property The property whose attribute value should be copied
* @param name The name of the attribute value to copy
* @return A copy of the attribute value. You need to call `free()` on it when
* done.
*/
extern char *_Nullable property_copyAttributeValue(
objc_property_t _Nonnull property, const char *_Nonnull name);
/**
* @brief Deinitializes the Objective-C runtime.
*
* This frees all data structures used by the runtime, after which Objective-C
* can no longer be used inside the current process. This is only useful for
* debugging and tests.
*/
extern void objc_deinit(void);
/**
* @brief Sets the handler for uncaught exceptions.
*
* @param handler The new handler for uncaught exceptions
* @return The old handler for uncaught exceptions
*/
extern _Nullable objc_uncaught_exception_handler
objc_setUncaughtExceptionHandler(
objc_uncaught_exception_handler _Nullable handler);
/**
* @brief Sets the forwarding handler for unimplemented methods.
*
* @param forward The forwarding handler for regular methods
* @param stretForward The forwarding handler for methods using the struct
* return ABI
*/
extern void objc_setForwardHandler(IMP _Nullable forward,
IMP _Nullable stretForward);
/**
* @brief Sets the handler for mutations during enumeration.
*
* @param handler The handler for mutations during enumeration
*/
extern void objc_setEnumerationMutationHandler(
objc_enumeration_mutation_handler _Nullable handler);
/**
* @brief Constructs an instance of the specified class in the specified array
* of bytes.
*
* @param class_ The class of which to construct an instance
* @param bytes An array of bytes of at least the length of the instance size.
* Must be properly aligned for the class.
* @return The constructed instance
*/
extern id _Nullable objc_constructInstance(Class _Nullable class_,
void *_Nullable bytes);
/**
* @brief Destructs the specified object.
*
* @param object The object to destruct
* @return The array of bytes that was used to back the instance
*/
extern void *_Nullable objc_destructInstance(id _Nullable object);
/**
* @brief Creates a new autorelease pool and puts it on top of the stack of
* autorelease pools.
*
* @return A new autorelease pool, which is now on the top of the stack of
* autorelease pools
*/
extern void *_Null_unspecified objc_autoreleasePoolPush(void);
/**
* @brief Drains the specified autorelease pool and all pools on top of it and
* removes it from the stack of autorelease pools.
*
* @param pool The pool which should be drained together with all pools on top
* of it
*/
extern void objc_autoreleasePoolPop(void *_Null_unspecified pool);
/**
* @brief Adds the specified object to the topmost autorelease pool.
*
* This is only to be used to implement the `autorelease` method in a root
* class.
*
* @param object The object to add to the topmost autorelease pool
* @return The autoreleased object
*/
extern id _Nullable _objc_rootAutorelease(id _Nullable object);
/**
* @brief Sets the tagged pointer secret.
*
* @param secret A secret, random value that will be used to XOR all tagged
* pointers with
*/
extern void objc_setTaggedPointerSecret(uintptr_t secret);
/**
* @brief Registers a class for tagged pointers.
*
* @param class_ The class to register for tagged pointers
* @return The tagged pointer ID for the registered class
*/
extern int objc_registerTaggedPointerClass(Class _Nonnull class_);
/**
* @brief Returns whether the specified object is a tagged pointer.
*
* @param object The object to inspect
* @return Whether the specified object is a tagged pointer
*/
extern bool object_isTaggedPointer(id _Nullable object);
/**
* @brief Returns the value of the specified tagged pointer.
*
* @param object The object whose tagged pointer value should be returned
* @return The tagged pointer value of the object
*/
extern uintptr_t object_getTaggedPointerValue(id _Nonnull object);
/**
* @brief Creates a new tagged pointer.
*
* @param class_ The tag ID for the tagged pointer class to use
* @param value The value the tagged pointer should have
* @return A tagged pointer, or `nil` if it could not be created
*/
extern id _Nullable objc_createTaggedPointer(int class_, uintptr_t value);
/**
* @brief Sets an associated object on the specified object for the specified
* key.
*
* @param object The object on which to set an associated object
* @param key A unique pointer to use as the key for the association
* @param value The object to associate with the specified object
* @param policy The association policy, see @ref objc_associationPolicy
*/
extern void objc_setAssociatedObject(id _Nonnull object,
const void *_Nonnull key, id _Nullable value,
objc_associationPolicy policy);
/**
* @brief Returns the associated object on the specified object for the
* specified key.
*
* @param object The object on which to get the associated object
* @param key The key of the association
* @return The associated object on the specified object for the specified key
*/
extern id _Nullable objc_getAssociatedObject(id _Nonnull object,
const void *_Nonnull key);
/**
* @brief Removes all associated objects for the specified object.
*
* @param object The object on which to remove all associated objects
*/
extern void objc_removeAssociatedObjects(id _Nonnull object);
/*
* Used by the compiler, but can also be called manually.
*
* These declarations are also required to prevent Clang's implicit
* declarations which include __declspec(dllimport) on Windows.
*/
struct _objc_module;
extern void __objc_exec_class(struct _objc_module *_Nonnull module);
extern IMP _Nonnull objc_msg_lookup(id _Nullable object, SEL _Nonnull selector);
extern IMP _Nonnull objc_msg_lookup_stret(id _Nullable object,
SEL _Nonnull selector);
extern IMP _Nonnull objc_msg_lookup_super(struct objc_super *_Nonnull super,
SEL _Nonnull selector);
extern IMP _Nonnull objc_msg_lookup_super_stret(
struct objc_super *_Nonnull super, SEL _Nonnull selector);
extern Class _Nullable objc_lookUpClass(const char *_Nonnull name);
extern Class _Nullable objc_getClass(const char *_Nonnull name);
extern Class _Nonnull objc_getRequiredClass(const char *_Nonnull name);
extern Class _Nullable objc_lookup_class(const char *_Nonnull name);
extern Class _Nonnull objc_get_class(const char *_Nonnull name);
extern void objc_exception_throw(id _Nullable object);
extern int objc_sync_enter(id _Nullable object);
extern int objc_sync_exit(id _Nullable object);
extern id _Nullable objc_getProperty(id _Nonnull self, SEL _Nonnull _cmd,
ptrdiff_t offset, bool atomic);
extern void objc_setProperty(id _Nonnull self, SEL _Nonnull _cmd,
ptrdiff_t offset, id _Nullable value, bool atomic, signed char copy);
extern void objc_getPropertyStruct(void *_Nonnull dest,
const void *_Nonnull src, ptrdiff_t size, bool atomic, bool strong);
extern void objc_setPropertyStruct(void *_Nonnull dest,
const void *_Nonnull src, ptrdiff_t size, bool atomic, bool strong);
extern void objc_enumerationMutation(id _Nonnull object);
#ifndef OBJC_NO_PERSONALITY_DECLARATION
/*
* No objfw-defs.h or config.h is available for the installed runtime headers,
* so we don't know which exceptions we have.
*/
extern int __gnu_objc_personality_v0(int version, int actions,
uint64_t exClass, void *_Nonnull ex, void *_Nonnull ctx);
extern int __gnu_objc_personality_sj0(int version, int actions,
uint64_t exClass, void *_Nonnull ex, void *_Nonnull ctx);
#endif
extern id _Nullable objc_retain(id _Nullable object);
extern id _Nullable objc_retainBlock(id _Nullable block);
extern id _Nullable objc_retainAutorelease(id _Nullable object);
extern void objc_release(id _Nullable object);
extern id _Nullable objc_autorelease(id _Nullable object);
extern id _Nullable objc_autoreleaseReturnValue(id _Nullable object);
extern id _Nullable objc_retainAutoreleaseReturnValue(id _Nullable object);
extern id _Nullable objc_retainAutoreleasedReturnValue(id _Nullable object);
extern id _Nullable objc_storeStrong(id _Nullable *_Nonnull object,
id _Nullable value);
extern id _Nullable objc_storeWeak(id _Nullable *_Nonnull object,
id _Nullable value);
extern id _Nullable objc_loadWeakRetained(id _Nullable *_Nonnull object);
extern _Nullable id objc_initWeak(id _Nullable *_Nonnull object,
id _Nullable value);
extern void objc_destroyWeak(id _Nullable *_Nonnull object);
extern id _Nullable objc_loadWeak(id _Nullable *_Nonnull object);
extern void objc_copyWeak(id _Nullable *_Nonnull dest,
id _Nullable *_Nonnull src);
extern void objc_moveWeak(id _Nullable *_Nonnull dest,
id _Nullable *_Nonnull src);
#ifdef __cplusplus
}
#endif
#endif