242 lines
8.8 KiB
Objective-C
242 lines
8.8 KiB
Objective-C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Undo the damage that exception_defines.h does.
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#undef try
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#undef catch
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#ifndef nsObjCExceptions_h_
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#define nsObjCExceptions_h_
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#import <Foundation/Foundation.h>
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#ifdef DEBUG
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#import <ExceptionHandling/NSExceptionHandler.h>
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#endif
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#if defined(MOZ_CRASHREPORTER) && defined(__cplusplus)
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#include "nsICrashReporter.h"
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#include "nsCOMPtr.h"
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#include "nsServiceManagerUtils.h"
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#endif
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#include <unistd.h>
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#include <signal.h>
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#include "nsError.h"
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// Undo the damage that exception_defines.h does.
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#undef try
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#undef catch
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/* NOTE: Macros that claim to abort no longer abort, see bug 486574.
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* If you actually want to log and abort, call "nsObjCExceptionLogAbort"
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* from an exception handler. At some point we will fix this by replacing
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* all macros in the tree with appropriately-named macros.
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*/
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// See Mozilla bug 163260.
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// This file can only be included in an Objective-C context.
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__attribute__((unused))
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static void
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nsObjCExceptionLog(NSException* aException)
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{
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NSLog(@"Mozilla has caught an Obj-C exception [%@: %@]",
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[aException name], [aException reason]);
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#if defined(MOZ_CRASHREPORTER) && defined(__cplusplus)
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// Attach exception info to the crash report.
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nsCOMPtr<nsICrashReporter> crashReporter =
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do_GetService("@mozilla.org/toolkit/crash-reporter;1");
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if (crashReporter) {
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crashReporter->AppendObjCExceptionInfoToAppNotes(static_cast<void*>(aException));
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}
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#endif
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#ifdef DEBUG
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@try {
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// Try to get stack information out of the exception. 10.5 returns the stack
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// info with the callStackReturnAddresses selector.
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NSArray* stackTrace = nil;
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if ([aException respondsToSelector:@selector(callStackReturnAddresses)]) {
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NSArray* addresses = (NSArray*)
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[aException performSelector:@selector(callStackReturnAddresses)];
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if ([addresses count]) {
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stackTrace = addresses;
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}
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}
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// 10.4 doesn't respond to callStackReturnAddresses so we'll try to pull the
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// stack info out of the userInfo. It might not be there, sadly :(
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if (!stackTrace) {
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stackTrace = [[aException userInfo] objectForKey:NSStackTraceKey];
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}
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if (stackTrace) {
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// The command line should look like this:
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// /usr/bin/atos -p <pid> -printHeader <stack frame addresses>
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NSMutableArray* args =
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[NSMutableArray arrayWithCapacity:[stackTrace count] + 3];
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[args addObject:@"-p"];
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int pid = [[NSProcessInfo processInfo] processIdentifier];
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[args addObject:[NSString stringWithFormat:@"%d", pid]];
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[args addObject:@"-printHeader"];
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unsigned int stackCount = [stackTrace count];
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unsigned int stackIndex = 0;
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for (; stackIndex < stackCount; stackIndex++) {
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unsigned long address =
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[[stackTrace objectAtIndex:stackIndex] unsignedLongValue];
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[args addObject:[NSString stringWithFormat:@"0x%lx", address]];
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}
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NSPipe* outPipe = [NSPipe pipe];
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NSTask* task = [[NSTask alloc] init];
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[task setLaunchPath:@"/usr/bin/atos"];
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[task setArguments:args];
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[task setStandardOutput:outPipe];
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[task setStandardError:outPipe];
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NSLog(@"Generating stack trace for Obj-C exception...");
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// This will throw an exception if the atos tool cannot be found, and in
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// that case we'll just hit our @catch block below.
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[task launch];
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[task waitUntilExit];
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[task release];
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NSData* outData =
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[[outPipe fileHandleForReading] readDataToEndOfFile];
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NSString* outString =
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[[NSString alloc] initWithData:outData encoding:NSUTF8StringEncoding];
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NSLog(@"Stack trace:\n%@", outString);
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[outString release];
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} else {
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NSLog(@"<No stack information available for Obj-C exception>");
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}
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}
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@catch (NSException* exn) {
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NSLog(@"Failed to generate stack trace for Obj-C exception [%@: %@]",
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[exn name], [exn reason]);
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}
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#endif
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}
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__attribute__((unused))
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static void
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nsObjCExceptionAbort()
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{
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// We need to raise a mach-o signal here, the Mozilla crash reporter on
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// Mac OS X does not respond to POSIX signals. Raising mach-o signals directly
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// is tricky so we do it by just derefing a null pointer.
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int* foo = nullptr;
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*foo = 1;
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}
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__attribute__((unused))
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static void
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nsObjCExceptionLogAbort(NSException* aException)
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{
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nsObjCExceptionLog(aException);
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nsObjCExceptionAbort();
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}
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#define NS_OBJC_TRY(_e, _fail) \
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@try { _e; } \
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@catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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_fail; \
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}
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#define NS_OBJC_TRY_EXPR(_e, _fail) \
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({ \
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typeof(_e) _tmp; \
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@try { _tmp = (_e); } \
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@catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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_fail; \
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} \
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_tmp; \
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})
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#define NS_OBJC_TRY_EXPR_NULL(_e) \
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NS_OBJC_TRY_EXPR(_e, 0)
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#define NS_OBJC_TRY_IGNORE(_e) \
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NS_OBJC_TRY(_e, )
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// To reduce code size the abort versions do not reuse above macros. This allows
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// catch blocks to only contain one call.
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#define NS_OBJC_TRY_ABORT(_e) \
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@try { _e; } \
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@catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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}
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#define NS_OBJC_TRY_EXPR_ABORT(_e) \
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({ \
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typeof(_e) _tmp; \
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@try { _tmp = (_e); } \
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@catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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} \
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_tmp; \
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})
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// For wrapping blocks of Obj-C calls. Does not actually terminate.
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#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK @try {
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#define NS_OBJC_END_TRY_ABORT_BLOCK } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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}
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// Same as above ABORT_BLOCK but returns a value after the try/catch block to
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// suppress compiler warnings. This allows us to avoid having to refactor code
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// to get scoping right when wrapping an entire method.
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#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL @try {
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#define NS_OBJC_END_TRY_ABORT_BLOCK_NIL } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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} \
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return nil;
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#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSNULL @try {
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#define NS_OBJC_END_TRY_ABORT_BLOCK_NSNULL } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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} \
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return nullptr;
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#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT @try {
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#define NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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} \
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return NS_ERROR_FAILURE;
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#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN @try {
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#define NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(_rv) } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn);\
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} \
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return _rv;
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#define NS_OBJC_BEGIN_TRY_LOGONLY_BLOCK @try {
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#define NS_OBJC_END_TRY_LOGONLY_BLOCK } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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}
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#define NS_OBJC_BEGIN_TRY_LOGONLY_BLOCK_RETURN @try {
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#define NS_OBJC_END_TRY_LOGONLY_BLOCK_RETURN(_rv) } @catch(NSException *_exn) { \
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nsObjCExceptionLog(_exn); \
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} \
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return _rv;
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#endif // nsObjCExceptions_h_
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