[Mac] Log stack trace for CHECK in bug 97285.

chrome/common/mac/objc_zombie.mm

 // Copyright (c) 2012 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/common/mac/objc_zombie.h"
 
 #include <dlfcn.h>
 #include <execinfo.h>
 #include <mach-o/dyld.h>
 #include <mach-o/nlist.h>
@@ skipping 272 matching lines @@
       [NSString stringWithFormat:@"Zombie <%s: %p> received -%s",
                                  wasaName, object, sel_getName(aSelector)];
   if (viaSelector != NULL) {
     const char* viaName = sel_getName(viaSelector);
     aString = [aString stringByAppendingFormat:@" (via -%s)", viaName];
   }
 
   // Set a value for breakpad to report.
   base::mac::SetCrashKeyValue(@"zombie", aString);
 
-  // Hex-encode the backtrace and tuck it into a breakpad key.
-  NSString* deallocTrace = @"<unknown>";
-  if (found && record.traceDepth) {
-    NSMutableArray* hexBacktrace =
-        [NSMutableArray arrayWithCapacity:record.traceDepth];
-    for (size_t i = 0; i < record.traceDepth; ++i) {
-      NSString* s = [NSString stringWithFormat:@"%p", record.trace[i]];
-      [hexBacktrace addObject:s];
-    }
-    deallocTrace = [hexBacktrace componentsJoinedByString:@" "];
-
-    // Warn someone if this exceeds the breakpad limits.
-    DCHECK_LE(strlen([deallocTrace UTF8String]), 255U);
+  // Encode trace into a breakpad key.
+  if (found) {
+    base::mac::SetCrashKeyFromAddresses(
+        @"zombie_dealloc_bt", record.trace, record.traceDepth);
   }
-  base::mac::SetCrashKeyValue(@"zombie_dealloc_bt", deallocTrace);
 
   // Log -dealloc backtrace in debug builds then crash with a useful
   // stack trace.
   if (found && record.traceDepth) {
     DCHECK(DumpDeallocTrace(record.trace, record.traceDepth));
   } else {
     DLOG(INFO) << "Unable to generate backtrace from -dealloc.";
   }
   DLOG(FATAL) << [aString UTF8String];
 
@@ skipping 238 matching lines @@
   if (oldZombies) {
     for (size_t i = 0; i < oldCount; ++i) {
       if (oldZombies[i].object)
         object_dispose(oldZombies[i].object);
     }
     free(oldZombies);
   }
 }
 
 }  // namespace ObjcEvilDoers