ObjFW  Artifact [efb4532301]

Artifact efb453230131bea2cd9468e2809963e837849844d078d1d2bed9bf2eb9bfc102:

• File src/OFObject.m — part of check-in [c70fd7d7f3] at 2016-10-08 15:57:45 on branch trunk — Never override CoreFoundations's forward handler

  If an application links ObjFW and (Core)Foundation, overriding
  CoreFoundation's forward handler breaks things.

  Before this commit, this only worked depending on the load order: If
  ObjFW was loaded first, everything was fine, as CoreFoundation would
  just override ObjFW's forward handler. However, if CoreFoundation would
  be loaded first, ObjFW would override CoreFoundation's forward handler
  and break CoreFoundation. (user: js, size: 25049) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
 *   Jonathan Schleifer <js@heap.zone>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <assert.h>

#include <sys/time.h>

#import "OFObject.h"
#import "OFArray.h"
#import "OFSystemInfo.h"
#import "OFTimer.h"
#import "OFRunLoop.h"
#import "OFThread.h"

#import "OFAllocFailedException.h"
#import "OFEnumerationMutationException.h"
#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFMemoryNotPartOfObjectException.h"
#import "OFNotImplementedException.h"
#import "OFOutOfMemoryException.h"
#import "OFOutOfRangeException.h"

#if defined(OF_APPLE_RUNTIME) && __OBJC2__
# import <objc/objc-exception.h>
#elif defined(OF_OBJFW_RUNTIME)
# import "runtime.h"
#endif

#ifdef OF_WINDOWS
# include <windows.h>
#endif

#import "OFString.h"

#import "instance.h"
#if defined(OF_HAVE_ATOMIC_OPS)
# import "atomic.h"
#elif defined(OF_HAVE_THREADS)
# import "threading.h"
#endif

#ifdef OF_APPLE_RUNTIME
extern void* CFRetain(void*) __attribute__((__weak__));
#endif

#if defined(OF_HAVE_FORWARDING_TARGET_FOR_SELECTOR)
extern id of_forward(id, SEL, ...);
extern struct stret of_forward_stret(id, SEL, ...);
#else
# define of_forward of_method_not_found
# define of_forward_stret of_method_not_found_stret
#endif

struct pre_ivar {
	int retainCount;
#if !defined(OF_HAVE_ATOMIC_OPS) && defined(OF_HAVE_THREADS)
	of_spinlock_t retainCountSpinlock;
#endif
	struct pre_mem *firstMem, *lastMem;
};

struct pre_mem {
	struct pre_mem *prev, *next;
	id owner;
};

#define PRE_IVARS_ALIGN ((sizeof(struct pre_ivar) + \
    (OF_BIGGEST_ALIGNMENT - 1)) & ~(OF_BIGGEST_ALIGNMENT - 1))
#define PRE_IVARS ((struct pre_ivar*)(void*)((char*)self - PRE_IVARS_ALIGN))

#define PRE_MEM_ALIGN ((sizeof(struct pre_mem) + \
    (OF_BIGGEST_ALIGNMENT - 1)) & ~(OF_BIGGEST_ALIGNMENT - 1))
#define PRE_MEM(mem) ((struct pre_mem*)(void*)((char*)mem - PRE_MEM_ALIGN))

static struct {
	Class isa;
} allocFailedException;

uint32_t of_hash_seed;

#if !defined(OF_APPLE_RUNTIME) || defined(__OBJC2__)
static void
uncaughtExceptionHandler(id exception)
{
	OFString *description = [exception description];
	OFArray *backtrace = nil;
	of_string_encoding_t encoding = [OFSystemInfo native8BitEncoding];

	fprintf(stderr, "\nRuntime error: Unhandled exception:\n%s\n",
	    [description cStringWithEncoding: encoding]);

	if ([exception respondsToSelector: @selector(backtrace)])
		backtrace = [exception backtrace];

	if (backtrace != nil) {
		OFString *s = [backtrace componentsJoinedByString: @"\n  "];
		fprintf(stderr, "\nBacktrace:\n  %s\n\n",
		    [s cStringWithEncoding: encoding]);
	}

	abort();
}
#endif

static void
enumerationMutationHandler(id object)
{
	@throw [OFEnumerationMutationException exceptionWithObject: object];
}

void OF_NO_RETURN_FUNC
of_method_not_found(id obj, SEL sel)
{
	[obj doesNotRecognizeSelector: sel];

	/*
	 * Just in case doesNotRecognizeSelector: returned, even though it must
	 * never return.
	 */
	abort();
}

void OF_NO_RETURN_FUNC
of_method_not_found_stret(void *st, id obj, SEL sel)
{
	of_method_not_found(obj, sel);
}

id
of_alloc_object(Class class, size_t extraSize, size_t extraAlignment,
    void **extra)
{
	OFObject *instance;
	size_t instanceSize;

	instanceSize = class_getInstanceSize(class);

	if OF_UNLIKELY (extraAlignment > 1)
		extraAlignment = ((instanceSize + extraAlignment - 1) &
		    ~(extraAlignment - 1)) - extraAlignment;

	instance = malloc(PRE_IVARS_ALIGN + instanceSize +
	    extraAlignment + extraSize);

	if OF_UNLIKELY (instance == nil) {
		allocFailedException.isa = [OFAllocFailedException class];
		@throw (id)&allocFailedException;
	}

	((struct pre_ivar*)instance)->retainCount = 1;
	((struct pre_ivar*)instance)->firstMem = NULL;
	((struct pre_ivar*)instance)->lastMem = NULL;

#if !defined(OF_HAVE_ATOMIC_OPS) && defined(OF_HAVE_THREADS)
	if OF_UNLIKELY (!of_spinlock_new(
	    &((struct pre_ivar*)instance)->retainCountSpinlock)) {
		free(instance);
		@throw [OFInitializationFailedException
		    exceptionWithClass: class];
	}
#endif

	instance = (OFObject*)((char*)instance + PRE_IVARS_ALIGN);

	memset(instance, 0, instanceSize);

	if (!objc_constructInstance(class, instance)) {
		free((char*)instance - PRE_IVARS_ALIGN);
		@throw [OFInitializationFailedException
		    exceptionWithClass: class];
	}

	if OF_UNLIKELY (extra != NULL)
		*extra = (char*)instance + instanceSize + extraAlignment;

	return instance;
}

const char*
_NSPrintForDebugger(id object)
{
	return [[object description]
	    cStringWithEncoding: [OFSystemInfo native8BitEncoding]];
}

/* References for static linking */
void
_references_to_categories_of_OFObject(void)
{
	_OFObject_KeyValueCoding_reference = 1;
	_OFObject_Serialization_reference = 1;
}

@implementation OFObject
+ (void)load
{
#if !defined(OF_APPLE_RUNTIME) || defined(__OBJC2__)
	objc_setUncaughtExceptionHandler(uncaughtExceptionHandler);
#endif

#if defined(OF_APPLE_RUNTIME)
	/*
	 * If the CFRetain symbol is defined, we are linked against
	 * CoreFoundation. Since CoreFoundation sets its own forward handler
	 * on load, we should not set ours, as this will break CoreFoundation.
	 *
	 * Unfortunately, there is no way to check if a forward handler has
	 * already been set, so this is the best we can do.
	 */
	if (&CFRetain == NULL)
		objc_setForwardHandler((void*)&of_forward,
		    (void*)&of_forward_stret);
#else
	objc_setForwardHandler((IMP)&of_forward, (IMP)&of_forward_stret);
#endif

	objc_setEnumerationMutationHandler(enumerationMutationHandler);

	of_hash_seed = 0;
	while (of_hash_seed == 0) {
#if defined(HAVE_ARC4RANDOM)
		of_hash_seed = arc4random();
#elif defined(HAVE_RANDOM)
		struct timeval t;
		gettimeofday(&t, NULL);
		srandom((unsigned)(t.tv_sec ^ t.tv_usec));
		of_hash_seed = (uint32_t)((random() << 16) |
		    (random() & 0xFFFF));
#else
		struct timeval t;
		gettimeofday(&t, NULL);
		srand((unsigned)(t.tv_sec ^ t.tv_usec));
		of_hash_seed = (uint32_t)((rand() << 16) | (rand() & 0xFFFF));
#endif
	}
}

+ (void)unload
{
}

+ (void)initialize
{
}

+ alloc
{
	return of_alloc_object(self, 0, 0, NULL);
}

+ new
{
	return [[self alloc] init];
}

+ (Class)class
{
	return self;
}

+ (OFString*)className
{
	return [OFString stringWithCString: class_getName(self)
				  encoding: OF_STRING_ENCODING_ASCII];
}

+ (bool)isSubclassOfClass: (Class)class
{
	for (Class iter = self; iter != Nil; iter = class_getSuperclass(iter))
		if (iter == class)
			return true;

	return false;
}

+ (Class)superclass
{
	return class_getSuperclass(self);
}

+ (bool)instancesRespondToSelector: (SEL)selector
{
	return class_respondsToSelector(self, selector);
}

+ (bool)conformsToProtocol: (Protocol*)protocol
{
	Class c;

	for (c = self; c != Nil; c = class_getSuperclass(c))
		if (class_conformsToProtocol(c, protocol))
			return true;

	return false;
}

+ (IMP)instanceMethodForSelector: (SEL)selector
{
	return class_getMethodImplementation(self, selector);
}

+ (const char*)typeEncodingForInstanceSelector: (SEL)selector
{
#if defined(OF_OBJFW_RUNTIME)
	return class_getMethodTypeEncoding(self, selector);
#else
	Method m;

	if ((m = class_getInstanceMethod(self, selector)) == NULL)
		return NULL;

	return method_getTypeEncoding(m);
#endif
}

+ (OFString*)description
{
	return [self className];
}

+ (IMP)replaceClassMethod: (SEL)selector
      withMethodFromClass: (Class)class
{
	IMP newImp;
	const char *typeEncoding;

	newImp = [class methodForSelector: selector];
	typeEncoding = [class typeEncodingForSelector: selector];

	return [self replaceClassMethod: selector
		     withImplementation: newImp
			   typeEncoding: typeEncoding];
}

+ (IMP)replaceInstanceMethod: (SEL)selector
	 withMethodFromClass: (Class)class
{
	IMP newImp;
	const char *typeEncoding;

	newImp = [class instanceMethodForSelector: selector];
	typeEncoding = [class typeEncodingForInstanceSelector: selector];

	return [self replaceInstanceMethod: selector
			withImplementation: newImp
			      typeEncoding: typeEncoding];
}

+ (IMP)replaceInstanceMethod: (SEL)selector
	  withImplementation: (IMP)implementation
		typeEncoding: (const char*)typeEncoding
{
	return class_replaceMethod(self, selector, implementation,
	    typeEncoding);
}

+ (IMP)replaceClassMethod: (SEL)selector
       withImplementation: (IMP)implementation
	     typeEncoding: (const char*)typeEncoding
{
	return class_replaceMethod(object_getClass(self), selector,
	    implementation, typeEncoding);
}

+ (void)inheritMethodsFromClass: (Class)class
{
	Class superclass = [self superclass];

	if ([self isSubclassOfClass: class])
		return;

#if defined(OF_OBJFW_RUNTIME)
	for (struct objc_method_list *methodlist =
	    object_getClass(class)->methodlist;
	    methodlist != NULL; methodlist = methodlist->next) {
		for (unsigned int i = 0; i < methodlist->count; i++) {
			SEL selector = (SEL)&methodlist->methods[i].sel;

			/*
			 * Don't replace methods implemented in the receiving
			 * class.
			 */
			if ([self methodForSelector: selector] !=
			    [superclass methodForSelector: selector])
				continue;

			[self replaceClassMethod: selector
			     withMethodFromClass: class];
		}
	}

	for (struct objc_method_list *methodlist = class->methodlist;
	    methodlist != NULL; methodlist = methodlist->next) {
		for (unsigned int i = 0; i < methodlist->count; i++) {
			SEL selector = (SEL)&methodlist->methods[i].sel;

			/*
			 * Don't replace methods implemented in the receiving
			 * class.
			 */
			if ([self instanceMethodForSelector: selector] !=
			    [superclass instanceMethodForSelector: selector])
				continue;

			[self replaceInstanceMethod: selector
				withMethodFromClass: class];
		}
	}
#elif defined(OF_APPLE_RUNTIME)
	Method *methodList;
	unsigned int count;

	methodList = class_copyMethodList(object_getClass(class), &count);
	@try {
		for (unsigned int i = 0; i < count; i++) {
			SEL selector = method_getName(methodList[i]);

			/*
			 * Don't replace methods implemented in the receiving
			 * class.
			 */
			if ([self methodForSelector: selector] !=
			    [superclass methodForSelector: selector])
				continue;

			[self replaceClassMethod: selector
			     withMethodFromClass: class];
		}
	} @finally {
		free(methodList);
	}

	methodList = class_copyMethodList(class, &count);
	@try {
		for (unsigned int i = 0; i < count; i++) {
			SEL selector = method_getName(methodList[i]);

			/*
			 * Don't replace methods implemented in the receiving
			 * class.
			 */
			if ([self instanceMethodForSelector: selector] !=
			    [superclass instanceMethodForSelector: selector])
				continue;

			[self replaceInstanceMethod: selector
				withMethodFromClass: class];
		}
	} @finally {
		free(methodList);
	}
#endif

	[self inheritMethodsFromClass: [class superclass]];
}

+ (bool)resolveClassMethod: (SEL)selector
{
	return false;
}

+ (bool)resolveInstanceMethod: (SEL)selector
{
	return false;
}

- init
{
	return self;
}

- (Class)class
{
	return object_getClass(self);
}

- (Class)superclass
{
	return class_getSuperclass(object_getClass(self));
}

- (OFString*)className
{
	return [OFString stringWithCString: object_getClassName(self)
				  encoding: OF_STRING_ENCODING_ASCII];
}

- (bool)isKindOfClass: (Class)class
{
	for (Class iter = object_getClass(self); iter != Nil;
	    iter = class_getSuperclass(iter))
		if (iter == class)
			return true;

	return false;
}

- (bool)isMemberOfClass: (Class)class
{
	return (object_getClass(self) == class);
}

- (bool)respondsToSelector: (SEL)selector
{
	return class_respondsToSelector(object_getClass(self), selector);
}

- (bool)conformsToProtocol: (Protocol*)protocol
{
	return [object_getClass(self) conformsToProtocol: protocol];
}

- (IMP)methodForSelector: (SEL)selector
{
	return class_getMethodImplementation(object_getClass(self), selector);
}

- (id)performSelector: (SEL)selector
{
#if defined(OF_OBJFW_RUNTIME)
	id (*imp)(id, SEL) = (id(*)(id, SEL))objc_msg_lookup(self, selector);
#elif defined(OF_APPLE_RUNTIME)
	id (*imp)(id, SEL) = (id(*)(id, SEL))objc_msgSend;
#endif

	return imp(self, selector);
}

- (id)performSelector: (SEL)selector
	   withObject: (id)object
{
#if defined(OF_OBJFW_RUNTIME)
	id (*imp)(id, SEL, id) =
	    (id(*)(id, SEL, id))objc_msg_lookup(self, selector);
#elif defined(OF_APPLE_RUNTIME)
	id (*imp)(id, SEL, id) = (id(*)(id, SEL, id))objc_msgSend;
#endif

	return imp(self, selector, object);
}

- (id)performSelector: (SEL)selector
	   withObject: (id)object1
	   withObject: (id)object2
{
#if defined(OF_OBJFW_RUNTIME)
	id (*imp)(id, SEL, id, id) =
	    (id(*)(id, SEL, id, id))objc_msg_lookup(self, selector);
#elif defined(OF_APPLE_RUNTIME)
	id (*imp)(id, SEL, id, id) = (id(*)(id, SEL, id, id))objc_msgSend;
#endif

	return imp(self, selector, object1, object2);
}

- (void)performSelector: (SEL)selector
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[OFTimer scheduledTimerWithTimeInterval: delay
					 target: self
				       selector: selector
					repeats: false];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	     withObject: (id)object
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[OFTimer scheduledTimerWithTimeInterval: delay
					 target: self
				       selector: selector
					 object: object
					repeats: false];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	     withObject: (id)object1
	     withObject: (id)object2
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[OFTimer scheduledTimerWithTimeInterval: delay
					 target: self
				       selector: selector
					 object: object1
					 object: object2
					repeats: false];

	objc_autoreleasePoolPop(pool);
}

#ifdef OF_HAVE_THREADS
- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	  waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						repeats: false];
	[[thread runLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	     withObject: (id)object
	  waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						 object: object
						repeats: false];
	[[thread runLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	     withObject: (id)object1
	     withObject: (id)object2
	  waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						 object: object1
						 object: object2
						repeats: false];
	[[thread runLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelectorOnMainThread: (SEL)selector
		      waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						repeats: false];
	[[OFRunLoop mainRunLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelectorOnMainThread: (SEL)selector
			 withObject: (id)object
		      waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						 object: object
						repeats: false];
	[[OFRunLoop mainRunLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelectorOnMainThread: (SEL)selector
			 withObject: (id)object1
			 withObject: (id)object2
		      waitUntilDone: (bool)waitUntilDone
{
	void *pool = objc_autoreleasePoolPush();
	OFTimer *timer = [OFTimer timerWithTimeInterval: 0
						 target: self
					       selector: selector
						 object: object1
						 object: object2
						repeats: false];
	[[OFRunLoop mainRunLoop] addTimer: timer];

	if (waitUntilDone)
		[timer waitUntilDone];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[[thread runLoop] addTimer: [OFTimer timerWithTimeInterval: delay
							    target: self
							  selector: selector
							   repeats: false]];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	     withObject: (id)object
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[[thread runLoop] addTimer: [OFTimer timerWithTimeInterval: delay
							    target: self
							  selector: selector
							    object: object
							   repeats: false]];

	objc_autoreleasePoolPop(pool);
}

- (void)performSelector: (SEL)selector
	       onThread: (OFThread*)thread
	     withObject: (id)object1
	     withObject: (id)object2
	     afterDelay: (of_time_interval_t)delay
{
	void *pool = objc_autoreleasePoolPush();

	[[thread runLoop] addTimer: [OFTimer timerWithTimeInterval: delay
							    target: self
							  selector: selector
							    object: object1
							    object: object2
							   repeats: false]];

	objc_autoreleasePoolPop(pool);
}
#endif

- (const char*)typeEncodingForSelector: (SEL)selector
{
#if defined(OF_OBJFW_RUNTIME)
	return class_getMethodTypeEncoding(object_getClass(self), selector);
#else
	Method m;

	if ((m = class_getInstanceMethod(object_getClass(self),
	    selector)) == NULL)
		return NULL;

	return method_getTypeEncoding(m);
#endif
}

- (bool)isEqual: (id)object
{
	return (self == object);
}

- (uint32_t)hash
{
	uintptr_t ptr = (uintptr_t)self;
	uint32_t hash;

	OF_HASH_INIT(hash);

	while (ptr != 0) {
		OF_HASH_ADD(hash, ptr & 0xFF);
		ptr <<= 8;
	}

	OF_HASH_FINALIZE(hash);

	return hash;
}

- (OFString*)description
{
	/* Classes containing data should reimplement this! */

	return [OFString stringWithFormat: @"<%@: %p>", [self className], self];
}

- (void*)allocMemoryWithSize: (size_t)size
{
	void *pointer;
	struct pre_mem *preMem;

	if OF_UNLIKELY (size == 0)
		return NULL;

	if OF_UNLIKELY (size > SIZE_MAX - PRE_IVARS_ALIGN)
		@throw [OFOutOfRangeException exception];

	if OF_UNLIKELY ((pointer = malloc(PRE_MEM_ALIGN + size)) == NULL)
		@throw [OFOutOfMemoryException
		    exceptionWithRequestedSize: size];
	preMem = pointer;

	preMem->owner = self;
	preMem->prev = PRE_IVARS->lastMem;
	preMem->next = NULL;

	if OF_LIKELY (PRE_IVARS->lastMem != NULL)
		PRE_IVARS->lastMem->next = preMem;

	if OF_UNLIKELY (PRE_IVARS->firstMem == NULL)
		PRE_IVARS->firstMem = preMem;
	PRE_IVARS->lastMem = preMem;

	return (char*)pointer + PRE_MEM_ALIGN;
}

- (void*)allocMemoryWithSize: (size_t)size
		       count: (size_t)count
{
	if OF_UNLIKELY (count > SIZE_MAX / size)
		@throw [OFOutOfRangeException exception];

	return [self allocMemoryWithSize: size * count];
}

- (void*)resizeMemory: (void*)pointer
		 size: (size_t)size
{
	void *new;
	struct pre_mem *preMem;

	if OF_UNLIKELY (pointer == NULL)
		return [self allocMemoryWithSize: size];

	if OF_UNLIKELY (size == 0) {
		[self freeMemory: pointer];
		return NULL;
	}

	if OF_UNLIKELY (PRE_MEM(pointer)->owner != self)
		@throw [OFMemoryNotPartOfObjectException
		    exceptionWithPointer: pointer
				  object: self];

	if OF_UNLIKELY ((new = realloc(PRE_MEM(pointer),
	    PRE_MEM_ALIGN + size)) == NULL)
		@throw [OFOutOfMemoryException
		    exceptionWithRequestedSize: size];
	preMem = new;

	if OF_UNLIKELY (preMem != PRE_MEM(pointer)) {
		if OF_LIKELY (preMem->prev != NULL)
			preMem->prev->next = preMem;
		if OF_LIKELY (preMem->next != NULL)
			preMem->next->prev = preMem;

		if OF_UNLIKELY (PRE_IVARS->firstMem == PRE_MEM(pointer))
			PRE_IVARS->firstMem = preMem;
		if OF_UNLIKELY (PRE_IVARS->lastMem == PRE_MEM(pointer))
			PRE_IVARS->lastMem = preMem;
	}

	return (char*)new + PRE_MEM_ALIGN;
}

- (void*)resizeMemory: (void*)pointer
		 size: (size_t)size
		count: (size_t)count
{
	if OF_UNLIKELY (pointer == NULL)
		return [self allocMemoryWithSize: size
					   count: count];

	if OF_UNLIKELY (size == 0 || count == 0) {
		[self freeMemory: pointer];
		return NULL;
	}

	if OF_UNLIKELY (count > SIZE_MAX / size)
		@throw [OFOutOfRangeException exception];

	return [self resizeMemory: pointer
			     size: size * count];
}

- (void)freeMemory: (void*)pointer
{
	if OF_UNLIKELY (pointer == NULL)
		return;

	if OF_UNLIKELY (PRE_MEM(pointer)->owner != self)
		@throw [OFMemoryNotPartOfObjectException
		    exceptionWithPointer: pointer
				  object: self];

	if OF_LIKELY (PRE_MEM(pointer)->prev != NULL)
		PRE_MEM(pointer)->prev->next = PRE_MEM(pointer)->next;
	if OF_LIKELY (PRE_MEM(pointer)->next != NULL)
		PRE_MEM(pointer)->next->prev = PRE_MEM(pointer)->prev;

	if OF_UNLIKELY (PRE_IVARS->firstMem == PRE_MEM(pointer))
		PRE_IVARS->firstMem = PRE_MEM(pointer)->next;
	if OF_UNLIKELY (PRE_IVARS->lastMem == PRE_MEM(pointer))
		PRE_IVARS->lastMem = PRE_MEM(pointer)->prev;

	/* To detect double-free */
	PRE_MEM(pointer)->owner = nil;

	free(PRE_MEM(pointer));
}

- (id)forwardingTargetForSelector: (SEL)selector
{
	return nil;
}

- (void)doesNotRecognizeSelector: (SEL)selector
{
	@throw [OFNotImplementedException exceptionWithSelector: selector
							 object: self];
}

- retain
{
#if defined(OF_HAVE_ATOMIC_OPS)
	of_atomic_int_inc(&PRE_IVARS->retainCount);
#else
	OF_ENSURE(of_spinlock_lock(&PRE_IVARS->retainCountSpinlock));
	PRE_IVARS->retainCount++;
	OF_ENSURE(of_spinlock_unlock(&PRE_IVARS->retainCountSpinlock));
#endif

	return self;
}

- (unsigned int)retainCount
{
	assert(PRE_IVARS->retainCount >= 0);
	return PRE_IVARS->retainCount;
}

- (void)release
{
#if defined(OF_HAVE_ATOMIC_OPS)
	if (of_atomic_int_dec(&PRE_IVARS->retainCount) <= 0)
		[self dealloc];
#else
	size_t c;

	OF_ENSURE(of_spinlock_lock(&PRE_IVARS->retainCountSpinlock));
	c = --PRE_IVARS->retainCount;
	OF_ENSURE(of_spinlock_unlock(&PRE_IVARS->retainCountSpinlock));

	if (c == 0)
		[self dealloc];
#endif
}

- autorelease
{
	return _objc_rootAutorelease(self);
}

- self
{
	return self;
}

- (bool)isProxy
{
	return false;
}

- (bool)allowsWeakReference
{
	return true;
}

- (bool)retainWeakReference
{
	[self retain];

	return true;
}

- (void)dealloc
{
	struct pre_mem *iter;

	objc_destructInstance(self);

	iter = PRE_IVARS->firstMem;
	while (iter != NULL) {
		struct pre_mem *next = iter->next;

		/*
		 * We can use owner as a sentinel to prevent exploitation in
		 * case there is a buffer underflow somewhere.
		 */
		OF_ENSURE(iter->owner == self);

		free(iter);

		iter = next;
	}

	free((char*)self - PRE_IVARS_ALIGN);
}

/* Required to use properties with the Apple runtime */
- copyWithZone: (void*)zone
{
	if OF_UNLIKELY (zone != NULL) {
		[self doesNotRecognizeSelector: _cmd];
		abort();
	}

	return [(id)self copy];
}

- mutableCopyWithZone: (void*)zone
{
	if OF_UNLIKELY (zone != NULL) {
		[self doesNotRecognizeSelector: _cmd];
		abort();
	}

	return [(id)self mutableCopy];
}

/*
 * Those are needed as the root class is the superclass of the root class's
 * metaclass and thus instance methods can be sent to class objects as well.
 */
+ (void*)allocMemoryWithSize: (size_t)size
{
	OF_UNRECOGNIZED_SELECTOR
}

+ (void*)allocMemoryWithSize: (size_t)size
		       count: (size_t)count
{
	OF_UNRECOGNIZED_SELECTOR
}

+ (void*)resizeMemory: (void*)pointer
		 size: (size_t)size
{
	OF_UNRECOGNIZED_SELECTOR
}

+ (void*)resizeMemory: (void*)pointer
		 size: (size_t)size
		count: (size_t)count
{
	OF_UNRECOGNIZED_SELECTOR
}

+ (void)freeMemory: (void*)pointer
{
	OF_UNRECOGNIZED_SELECTOR
}

+ retain
{
	return self;
}

+ autorelease
{
	return self;
}

+ (unsigned int)retainCount
{
	return OF_RETAIN_COUNT_MAX;
}

+ (void)release
{
}

+ (void)dealloc
{
	OF_UNRECOGNIZED_SELECTOR
}

+ copy
{
	return self;
}

+ mutableCopyWithZone: (void*)zone
{
	OF_UNRECOGNIZED_SELECTOR
}

/* Required to use ObjFW from Swift */
+ allocWithZone: (void*)zone
{
	if OF_UNLIKELY (zone != NULL) {
		[self doesNotRecognizeSelector: _cmd];
		abort();
	}

	return [self alloc];
}
@end