[Mac] Sinkhole __NSFireDelayedPerform and _CFXNotificationPost in the exception preprocessor.

chrome/browser/mac/exception_processor.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/mac/exception_processor.h"
 
 #include <dlfcn.h>
 #import <Foundation/Foundation.h>
 #include <libunwind.h>
 #include <objc/objc-exception.h>
@@ skipping 61 matching lines @@
 
 void RecordExceptionWithUma(NSException* exception) {
   UMA_HISTOGRAM_ENUMERATION("OSX.NSException",
       BinForException(exception), kUnknownNSException);
 }
 
 static objc_exception_preprocessor g_next_preprocessor = nullptr;
 
 static const char* const kExceptionSinkholes[] = {
   "CFRunLoopRunSpecific",
+  "_CFXNotificationPost",
   "_dispatch_client_callout",
+  "__NSFireDelayedPerform",
 };
 
 // This function is used to make it clear to the crash processor that this is
 // a forced exception crash.
 static NOINLINE void TERMINATING_FROM_UNCAUGHT_NSEXCEPTION(id exception) {
   NSString* exception_message_ns = [NSString
       stringWithFormat:@"%@: %@", [exception name], [exception reason]];
   std::string exception_message = base::SysNSStringToUTF8(exception_message_ns);
   base::debug::SetCrashKeyValue(crash_keys::mac::kNSException,
                                 exception_message);
@@ skipping 73 matching lines @@
 
       // Check if the function is one that is known to obscure (by way of
       // catch-and-rethrow) exception stack traces. If it is, sinkhole it
       // by crashing here at the point of throw.
       for (const auto& sinkhole : kExceptionSinkholes) {
         if (strcmp(sinkhole, proc_name) == 0) {
           TERMINATING_FROM_UNCAUGHT_NSEXCEPTION(exception);
         }
       }
 
+      DVLOG(1) << "Stopping search for exception handler at " << proc_name;
+
       break;
     }
   }
 
   // Forward to the next preprocessor.
   if (g_next_preprocessor)
     return g_next_preprocessor(exception);
 
   return exception;
 }
 
 void InstallObjcExceptionPreprocessor() {
   if (g_next_preprocessor)
     return;
 
   g_next_preprocessor =
       objc_setExceptionPreprocessor(&ObjcExceptionPreprocessor);
 }
 
 void UninstallObjcExceptionPreprocessor() {
   objc_setExceptionPreprocessor(g_next_preprocessor);
   g_next_preprocessor = nullptr;
 }
 
 }  // namespace chrome