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      1 /*
      2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "WebCoreObjCExtras.h"
     31 
     32 #include <objc/objc-auto.h>
     33 #include <objc/objc-runtime.h>
     34 #include <wtf/Assertions.h>
     35 #include <wtf/MainThread.h>
     36 #include <wtf/Threading.h>
     37 #include <wtf/UnusedParam.h>
     38 
     39 void WebCoreObjCFinalizeOnMainThread(Class cls)
     40 {
     41     // This method relies on threading being initialized by the caller, otherwise
     42     // WebCoreObjCScheduleDeallocateOnMainThread will crash.
     43 #if !defined(BUILDING_ON_TIGER) && !defined(DONT_FINALIZE_ON_MAIN_THREAD)
     44     objc_finalizeOnMainThread(cls);
     45 #else
     46     UNUSED_PARAM(cls);
     47 #endif
     48 }
     49 
     50 #ifdef BUILDING_ON_TIGER
     51 static inline IMP method_getImplementation(Method method)
     52 {
     53     return method->method_imp;
     54 }
     55 #endif
     56 
     57 typedef std::pair<Class, id> ClassAndIdPair;
     58 
     59 static void deallocCallback(void* context)
     60 {
     61     ClassAndIdPair* pair = static_cast<ClassAndIdPair*>(context);
     62 
     63     Method method = class_getInstanceMethod(pair->first, @selector(dealloc));
     64 
     65     IMP imp = method_getImplementation(method);
     66     imp(pair->second, @selector(dealloc));
     67 
     68     delete pair;
     69 }
     70 
     71 bool WebCoreObjCScheduleDeallocateOnMainThread(Class cls, id object)
     72 {
     73     ASSERT([object isKindOfClass:cls]);
     74 
     75 #if USE(WEB_THREAD)
     76     if (isMainThread())
     77         return false;
     78 #else
     79     if (pthread_main_np() != 0)
     80         return false;
     81 #endif
     82 
     83     ClassAndIdPair* pair = new ClassAndIdPair(cls, object);
     84     callOnMainThread(deallocCallback, pair);
     85     return true;
     86 }
     87 
     88