1 files changed, 56 insertions, 0 deletions
diff --git a/xpcom/base/nsObjCExceptions.h b/xpcom/base/nsObjCExceptions.h
new file mode 100644
index 0000000000..e8c2059d8e
--- /dev/null
+++ b/xpcom/base/nsObjCExceptions.h
@@ -0,0 +1,56 @@
+/* -*- 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/. */
+
+#ifndef nsObjCExceptions_h_
+#define nsObjCExceptions_h_
+
+// Undo the damage that exception_defines.h does.
+#undef try
+#undef catch
+
+@class NSException;
+
+// See Mozilla bug 163260.
+// This file can only be included in an Objective-C context.
+
+void nsObjCExceptionLog(NSException* aException);
+
+namespace mozilla {
+
+// Check if this is an exception that's outside of our control.
+// Called when an exception bubbles up to the native event loop.
+bool ShouldIgnoreObjCException(NSException* aException);
+
+}  // namespace mozilla
+
+// For wrapping blocks of Obj-C calls which are not expected to throw exception.
+// Causes a MOZ_CRASH if an Obj-C exception is encountered.
+#define NS_OBJC_BEGIN_TRY_ABORT_BLOCK @try {
+#define NS_OBJC_END_TRY_ABORT_BLOCK                            \
+  }                                                            \
+  @catch (NSException * _exn) {                                \
+    nsObjCExceptionLog(_exn);                                  \
+    MOZ_CRASH("Encountered unexpected Objective C exception"); \
+  }
+
+// For wrapping blocks of Obj-C calls. Logs the exception and moves on.
+#define NS_OBJC_BEGIN_TRY_IGNORE_BLOCK @try {
+#define NS_OBJC_END_TRY_IGNORE_BLOCK \
+  }                                  \
+  @catch (NSException * _exn) {      \
+    nsObjCExceptionLog(_exn);        \
+  }
+
+// Same as above IGNORE_BLOCK but returns a value after the try/catch block.
+#define NS_OBJC_BEGIN_TRY_BLOCK_RETURN @try {
+#define NS_OBJC_END_TRY_BLOCK_RETURN(_rv) \
+  }                                       \
+  @catch (NSException * _exn) {           \
+    nsObjCExceptionLog(_exn);             \
+  }                                       \
+  return _rv;
+
+#endif  // nsObjCExceptions_h_