When code raises an Objective-C exception, unwind the stack looking for
any exception handlers. If an exception handler is encountered, test to
see if it is a function known to be a catch-and-rethrow 'sinkhole'
exception handler. Various routines in UIKit and elsewhere do this, and
they obscure the exception stack, since the original throw location is
no longer present on the stack (just the re-throw) when Crashpad
captures the crash report. In the case of sinkholes, trigger an
immediate exception to capture the original stack.
The is an improvement over the alternative,
NSSetUncaughtExceptionHandler, which passes along the stack frames, but
not the stack memory contents and full exception context itself.
The details of what happens after a fatal exception is triggered are
unresolved in this CL. For now, simply call std::terminate.
This code was inspired by chromium/src/chrome/browser/mac/
exception_processor.mm.
Bug: crashpad:31
Change-Id: Ieebc6476a0507c466c8219c10f790ec0a624e58c
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2125254
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
