pjs/xpcom/base/nsObjCExceptions.h

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Objective-C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Josh Aas <josh@mozilla.com>
* Robert O'Callahan <robert@ocallahan.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsObjCExceptions_h_
#define nsObjCExceptions_h_
#import <Foundation/Foundation.h>
#ifdef DEBUG
#import <ExceptionHandling/NSExceptionHandler.h>
#endif
#if defined(MOZ_CRASHREPORTER) && defined(__cplusplus)
#include "nsICrashReporter.h"
#include "nsCOMPtr.h"
#include "nsServiceManagerUtils.h"
#endif
#include <unistd.h>
#include <signal.h>
#include "nsError.h"
/* NOTE: Macros that claim to abort no longer abort, see bug 486574.
* If you actually want to log and abort, call "nsObjCExceptionLogAbort"
* from an exception handler. At some point we will fix this by replacing
* all macros in the tree with appropriately-named macros.
*/
// See Mozilla bug 163260.
// This file can only be included in an Objective-C context.
__attribute__((unused))
static void nsObjCExceptionLog(NSException* aException)
{
NSLog(@"Mozilla has caught an Obj-C exception [%@: %@]",
[aException name], [aException reason]);
#if defined(MOZ_CRASHREPORTER) && defined(__cplusplus)
// Attach exception info to the crash report.
nsCOMPtr<nsICrashReporter> crashReporter =
do_GetService("@mozilla.org/toolkit/crash-reporter;1");
if (crashReporter)
crashReporter->AppendObjCExceptionInfoToAppNotes(static_cast<void*>(aException));
#endif
#ifdef DEBUG
@try {
// Try to get stack information out of the exception. 10.5 returns the stack
// info with the callStackReturnAddresses selector.
NSArray *stackTrace = nil;
if ([aException respondsToSelector:@selector(callStackReturnAddresses)]) {
NSArray* addresses = (NSArray*)
[aException performSelector:@selector(callStackReturnAddresses)];
if ([addresses count])
stackTrace = addresses;
}
// 10.4 doesn't respond to callStackReturnAddresses so we'll try to pull the
// stack info out of the userInfo. It might not be there, sadly :(
if (!stackTrace)
stackTrace = [[aException userInfo] objectForKey:NSStackTraceKey];
if (stackTrace) {
// The command line should look like this:
// /usr/bin/atos -p <pid> -printHeader <stack frame addresses>
NSMutableArray *args =
[NSMutableArray arrayWithCapacity:[stackTrace count] + 3];
[args addObject:@"-p"];
int pid = [[NSProcessInfo processInfo] processIdentifier];
[args addObject:[NSString stringWithFormat:@"%d", pid]];
[args addObject:@"-printHeader"];
unsigned int stackCount = [stackTrace count];
unsigned int stackIndex = 0;
for (; stackIndex < stackCount; stackIndex++)
[args addObject:[[stackTrace objectAtIndex:stackIndex] stringValue]];
NSPipe *outPipe = [NSPipe pipe];
NSTask *task = [[NSTask alloc] init];
[task setLaunchPath:@"/usr/bin/atos"];
[task setArguments:args];
[task setStandardOutput:outPipe];
[task setStandardError:outPipe];
NSLog(@"Generating stack trace for Obj-C exception...");
// This will throw an exception if the atos tool cannot be found, and in
// that case we'll just hit our @catch block below.
[task launch];
[task waitUntilExit];
[task release];
NSData *outData =
[[outPipe fileHandleForReading] readDataToEndOfFile];
NSString *outString =
[[NSString alloc] initWithData:outData encoding:NSUTF8StringEncoding];
NSLog(@"Stack trace:\n%@", outString);
[outString release];
}
else {
NSLog(@"<No stack information available for Obj-C exception>");
}
}
@catch (NSException *exn) {
NSLog(@"Failed to generate stack trace for Obj-C exception [%@: %@]",
[exn name], [exn reason]);
}
#endif
}
__attribute__((unused))
static void nsObjCExceptionAbort()
{
// We need to raise a mach-o signal here, the Mozilla crash reporter on
// Mac OS X does not respond to POSIX signals. Raising mach-o signals directly
// is tricky so we do it by just derefing a null pointer.
int* foo = NULL;
*foo = 1;
}
__attribute__((unused))
static void nsObjCExceptionLogAbort(NSException *e)
{
nsObjCExceptionLog(e);
nsObjCExceptionAbort();
}
#define NS_OBJC_TRY(_e, _fail) \
@try { _e; } \
@catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
_fail; \
}
#define NS_OBJC_TRY_EXPR(_e, _fail) \
({ \
typeof(_e) _tmp; \
@try { _tmp = (_e); } \
@catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
_fail; \
} \
_tmp; \
})
#define NS_OBJC_TRY_EXPR_NULL(_e) \
NS_OBJC_TRY_EXPR(_e, 0)
#define NS_OBJC_TRY_IGNORE(_e) \
NS_OBJC_TRY(_e, )
// To reduce code size the abort versions do not reuse above macros. This allows
// catch blocks to only contain one call.
#define NS_OBJC_TRY_ABORT(_e) \
@try { _e; } \
@catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
}
#define NS_OBJC_TRY_EXPR_ABORT(_e) \
({ \
typeof(_e) _tmp; \
@try { _tmp = (_e); } \
@catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
} \
_tmp; \
})
// For wrapping blocks of Obj-C calls. Does not actually terminate.
#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK @try {
#define NS_OBJC_END_TRY_ABORT_BLOCK } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
}
// Same as above ABORT_BLOCK but returns a value after the try/catch block to
// suppress compiler warnings. This allows us to avoid having to refactor code
// to get scoping right when wrapping an entire method.
#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL @try {
#define NS_OBJC_END_TRY_ABORT_BLOCK_NIL } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
} \
return nil;
#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSNULL @try {
#define NS_OBJC_END_TRY_ABORT_BLOCK_NSNULL } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
} \
return nsnull;
#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT @try {
#define NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
} \
return NS_ERROR_FAILURE;
#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN @try {
#define NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(_rv) } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn);\
} \
return _rv;
#define NS_OBJC_BEGIN_TRY_LOGONLY_BLOCK @try {
#define NS_OBJC_END_TRY_LOGONLY_BLOCK } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
}
#define NS_OBJC_BEGIN_TRY_LOGONLY_BLOCK_RETURN @try {
#define NS_OBJC_END_TRY_LOGONLY_BLOCK_RETURN(_rv) } @catch(NSException *_exn) { \
nsObjCExceptionLog(_exn); \
} \
return _rv;
#endif // nsObjCExceptions_h_