tree f2acab9be8c2a16316666ccbd8abdb140dff793d
parent d9207841e5750263821a63296131e716d096a378
author Muiez Ahmed <muiez@ibm.com> 1656439189 +0300
committer Copybara-Service <copybara-worker@google.com> 1656439569 -0700

[SystemZ][z/OS] Modify cxxabi to be compatible with existing z/OS runtime

This patch is to enable exception handling on the z/OS platform that is compatible with the existing z/OS runtime. No functionality of libcxxabi has been changed for other platforms. With this patch the hope is we can add z/OS as a platform to perform testing on any C++ ABI changes.

There is a primary difference for the z/OS implementation. On z/OS the thrown object is added to a linked list of caught and uncaught exceptions. The unwinder uses the top one as the current exception it is trying to find the landing pad for. We have to pop the top exception after we get it’s landing pad for our unwinder to correctly get any subsequent rethrows or nested exception calls.

Differential Revision: https://reviews.llvm.org/D99913

GitOrigin-RevId: 85593e7bb5a8bfde80aaf4eb4e15f982aebe2282