Add m-esr52 at 52.6.0

1 files changed, 230 insertions, 0 deletions

diff --git a/xpcom/base/nsObjCExceptions.h b/xpcom/base/nsObjCExceptions.h
new file mode 100644
index 000000000..e63c92af5
--- /dev/null
+++ b/xpcom/base/nsObjCExceptions.h
@@ -0,0 +1,230 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Undo the damage that exception_defines.h does.
+#undef try
+#undef catch
+
+#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"
+
+// Undo the damage that exception_defines.h does.
+#undef try
+#undef catch
+
+/* 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++) {
+        unsigned long address =
+          [[stackTrace objectAtIndex:stackIndex] unsignedLongValue];
+        [args addObject:[NSString stringWithFormat:@"0x%lx", address]];
+      }
+
+      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 = nullptr;
+  *foo = 1;
+}
+
+__attribute__((unused))
+static void
+nsObjCExceptionLogAbort(NSException* aException)
+{
+  nsObjCExceptionLog(aException);
+  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 nullptr;
+
+#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;
+
+#endif // nsObjCExceptions_h_