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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 // This file intentionally calls objc_finalizeOnMainThread, which is deprecated.
     30 // According to http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Diagnostic-Pragmas.html#Diagnostic-Pragmas
     31 // we need to place this directive before any data or functions are defined.
     32 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
     33 
     34 #include "config.h"
     35 #include "WebCoreObjCExtras.h"
     36 
     37 #include <objc/objc-auto.h>
     38 #include <objc/objc-runtime.h>
     39 #include <wtf/Assertions.h>
     40 #include <wtf/MainThread.h>
     41 #include <wtf/Threading.h>
     42 #include <wtf/UnusedParam.h>
     43 
     44 void WebCoreObjCFinalizeOnMainThread(Class cls)
     45 {
     46     // This method relies on threading being initialized by the caller, otherwise
     47     // WebCoreObjCScheduleDeallocateOnMainThread will crash.
     48 #if !defined(BUILDING_ON_TIGER) && !defined(DONT_FINALIZE_ON_MAIN_THREAD)
     49     objc_finalizeOnMainThread(cls);
     50 #else
     51     UNUSED_PARAM(cls);
     52 #endif
     53 }
     54 
     55 #ifdef BUILDING_ON_TIGER
     56 static inline IMP method_getImplementation(Method method)
     57 {
     58     return method->method_imp;
     59 }
     60 #endif
     61 
     62 typedef std::pair<Class, id> ClassAndIdPair;
     63 
     64 static void deallocCallback(void* context)
     65 {
     66     ClassAndIdPair* pair = static_cast<ClassAndIdPair*>(context);
     67 
     68     Method method = class_getInstanceMethod(pair->first, @selector(dealloc));
     69 
     70     IMP imp = method_getImplementation(method);
     71     imp(pair->second, @selector(dealloc));
     72 
     73     delete pair;
     74 }
     75 
     76 bool WebCoreObjCScheduleDeallocateOnMainThread(Class cls, id object)
     77 {
     78     ASSERT([object isKindOfClass:cls]);
     79 
     80     if (isMainThread())
     81         return false;
     82 
     83     ClassAndIdPair* pair = new ClassAndIdPair(cls, object);
     84     callOnMainThread(deallocCallback, pair);
     85     return true;
     86 }
     87 
     88