blob: 2213108cb904d5c9c6268941c90a4ae4450108ea [file] [log] [blame]
/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PoseAsClass.h"
#import <objc/runtime.h>
#import <wtf/Assertions.h>
static void swizzleAllMethods(Class imposter, Class original)
{
unsigned int imposterMethodCount;
Method* imposterMethods = class_copyMethodList(imposter, &imposterMethodCount);
unsigned int originalMethodCount;
Method* originalMethods = class_copyMethodList(original, &originalMethodCount);
for (unsigned int i = 0; i < imposterMethodCount; i++) {
SEL imposterMethodName = method_getName(imposterMethods[i]);
// Attempt to add the method to the original class. If it fails, the method already exists and we should
// instead exchange the implementations.
if (class_addMethod(original, imposterMethodName, method_getImplementation(imposterMethods[i]), method_getTypeEncoding(imposterMethods[i])))
continue;
unsigned int j = 0;
for (; j < originalMethodCount; j++) {
SEL originalMethodName = method_getName(originalMethods[j]);
if (sel_isEqual(imposterMethodName, originalMethodName))
break;
}
// If class_addMethod failed above then the method must exist on the original class.
ASSERT(j < originalMethodCount);
method_exchangeImplementations(imposterMethods[i], originalMethods[j]);
}
free(imposterMethods);
free(originalMethods);
}
void poseAsClass(const char* imposter, const char* original)
{
Class imposterClass = objc_getClass(imposter);
Class originalClass = objc_getClass(original);
// Swizzle instance methods
swizzleAllMethods(imposterClass, originalClass);
// and then class methods
swizzleAllMethods(object_getClass(imposterClass), object_getClass(originalClass));
}