tree aef280915c647b8dff40c422994168724647b58c
parent 1371e16998d7f46b690252518a387082b8581870
author Martin Storsjö <martin@martin.st> 1680639980 +0000
committer Copybara-Service <copybara-worker@google.com> 1681160826 -0700

[libunwind] [SEH] Sync LSDA and handler between unw_proc_info_t and DISPATCHER_CONTEXT

For normal C++ unwinding, we get _dispContext initialized by the
prepopulated DISPATCHER_CONTEXT in _GCC_specific_handler, which
we set with __unw_seh_set_disp_ctx.

When doing force unwinding, we step and populate the unw_proc_info_t
struct _info with getInfoFromSEH, but when we execute the handler
via the __libunwind_seh_personality wrapper function, we execute
the handler set in DISPATCHER_CONTEXT.

Whenever updating these fields in either _info or _dispContext,
sync them to the other one too.

This fixes one aspect of the libcxxabi force_unwind*.pass.cpp tests on
x86_64.

Differential Revision: https://reviews.llvm.org/D147637

GitOrigin-RevId: 87ca04033c1bf79f4de964505dd8818cbbc2bdf4