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

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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
This commit is contained in:
Martin Storsjö 2023-04-04 20:26:20 +00:00
parent 55abdef3da
commit 87ca04033c
1 changed files with 11 additions and 1 deletions
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12
libunwind/src/UnwindCursor.hpp
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@ -506,7 +506,14 @@ public:
#endif
DISPATCHER_CONTEXT *getDispatcherContext() { return &_dispContext; }
void setDispatcherContext(DISPATCHER_CONTEXT *disp) { _dispContext = *disp; }
void setDispatcherContext(DISPATCHER_CONTEXT *disp) {
_dispContext = *disp;
_info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData);
if (_dispContext.LanguageHandler) {
_info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
} else
_info.handler = 0;
}
// libunwind does not and should not depend on C++ library which means that we
// need our own definition of inline placement new.
@ -1978,6 +1985,9 @@ bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) {
uint32_t lastcode = (xdata->CountOfCodes + 1) & ~1;
const uint32_t *handler = reinterpret_cast<uint32_t *>(&xdata->UnwindCodes[lastcode]);
_info.lsda = reinterpret_cast<unw_word_t>(handler+1);
_dispContext.HandlerData = reinterpret_cast<void *>(_info.lsda);
_dispContext.LanguageHandler =
reinterpret_cast<EXCEPTION_ROUTINE *>(base + *handler);
if (*handler) {
_info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
} else