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/**
Copyright (C) 2014 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <rfm@gnu.org>
Date: April 2014
This file is part of the Performance Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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 for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
*/
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSHashTable.h>
#import <Foundation/NSLock.h>
#import <Foundation/NSObjCRuntime.h>
#import <Foundation/NSSet.h>
#import <GNUstepBase/GSObjCRuntime.h>
#import "GSUniqued.h"
static Class GSUniquedClass = Nil;
static NSLock *uniquedObjectsLock;
static IMP iLock;
static IMP iUnlock;
static NSHashTable *uniquedObjects;
static NSLock *classLock;
static NSMutableDictionary *classMap;
/* Deallocate a uniqued object ... we must remove it from the uniqued
* objects table and then call the real -dealloc method.
*/
static void
uDealloc(id self, SEL _cmd)
{
Class c;
IMP i;
NSHashRemove(uniquedObjects, self);
c = object_getClass(self);
c = class_getSuperclass(c);
i = class_getMethodImplementation(c, _cmd);
(*i)(self, _cmd);
}
/* Release a uniqued object ... we must obtain a lock in case the uniqued
* objects table has to be modified by removal of this instance on
* deallocation.
*/
static void
uRelease(id self, SEL _cmd)
{
Class c;
IMP i;
c = object_getClass(self);
c = class_getSuperclass(c);
i = class_getMethodImplementation(c, _cmd);
(*iLock)(uniquedObjectsLock, @selector(lock));
(*i)(self, _cmd);
(*iUnlock)(uniquedObjectsLock, @selector(unlock));
}
@implementation GSUniqued
static Class NSObjectClass;
+ (void) initialize
{
if (Nil == GSUniquedClass)
{
classLock = [NSLock new];
classMap = [NSMutableDictionary new];
uniquedObjectsLock = [NSLock new];
iLock = [uniquedObjectsLock methodForSelector: @selector(lock)];
iUnlock = [uniquedObjectsLock methodForSelector: @selector(unlock)];
uniquedObjects = NSCreateHashTable(
NSNonRetainedObjectHashCallBacks, 10000);
NSObjectClass = [NSObject class];
GSUniquedClass = [GSUniqued class];
}
}
+ (id) allocWithZone: (NSZone*)z
{
[NSException raise: NSInvalidArgumentException
format: @"Attempt to allocate instance of GSUniqued"];
return nil;
}
+ (id) copyUniqued: (id<NSObject,NSCopying>)anObject
{
NSObject *found;
NSAssert(nil != anObject, NSInvalidArgumentException);
(*iLock)(uniquedObjectsLock, @selector(lock));
found = [(NSObject*)NSHashGet(uniquedObjects, anObject) retain];
(*iUnlock)(uniquedObjectsLock, @selector(unlock));
if (nil == found)
{
NSObject *aCopy;
Class c;
Class u;
aCopy = [anObject copyWithZone: NSDefaultMallocZone()];
if (aCopy == anObject)
{
/* Unable to make a copy ... that probably means the object
* is already unique and we can just return it.
*/
if (NO == [aCopy isKindOfClass: [NSString class]])
{
return aCopy;
}
else
{
NSMutableString *m;
/* We have different subclasses of NSString and we can't swizzle
* a constant string, so in that case we need to work with another
* type of string.
*/
m = [aCopy mutableCopy];
[aCopy release];
aCopy = [m copy];
[m release];
}
}
c = object_getClass(aCopy);
[classLock lock];
u = [classMap objectForKey: (id<NSCopying>)c];
if (Nil == u)
{
const char *cn = class_getName(c);
char name[strlen(cn) + 20];
Method method;
sprintf(name, "GSUniqued%s", cn);
u = objc_allocateClassPair(c, name, 0);
method = class_getInstanceMethod(NSObjectClass,
@selector(dealloc));
class_addMethod(u, @selector(dealloc),
(IMP)uDealloc, method_getTypeEncoding(method));
method = class_getInstanceMethod(NSObjectClass,
@selector(release));
class_addMethod(u, @selector(release),
(IMP)uRelease, method_getTypeEncoding(method));
method = class_getInstanceMethod(GSUniquedClass,
@selector(copyUniqued));
class_addMethod(u, @selector(copyUniqued),
class_getMethodImplementation(GSUniquedClass,
@selector(copyUniqued)),
method_getTypeEncoding(method));
objc_registerClassPair(u);
[classMap setObject: u forKey: (id<NSCopying>)c];
}
[classLock unlock];
(*iLock)(uniquedObjectsLock, @selector(lock));
found = [(NSObject*)NSHashGet(uniquedObjects, anObject) retain];
if (nil == found)
{
found = aCopy;
#if defined(GNUSTEP)
GSClassSwizzle(found, u);
#else
object_setClass(found, u);
#endif
NSHashInsert(uniquedObjects, found);
}
else
{
[aCopy release]; // Already uniqued by another thread
}
(*iUnlock)(uniquedObjectsLock, @selector(unlock));
}
return found;
}
- (id) copyUniqued
{
return [self retain];
}
@end
@implementation NSObject (GSUniqued)
- (id) copyUniqued
{
if (Nil == GSUniquedClass) [GSUniqued class];
return [GSUniquedClass copyUniqued: (id<NSObject,NSCopying>)self];
}
@end
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