================
@@ -2018,6 +2018,52 @@ bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) {
_info.handler = 0;
}
}
+#elif defined(_LIBUNWIND_TARGET_AARCH64)
+ if (unwindEntry->Flag != 0) { // Packed unwind info
+ _info.end_ip = _info.start_ip + unwindEntry->FunctionLength * 4;
+ // Only fill in the handler and LSDA if they're stale.
+ if (pc != getLastPC()) {
+ // Packed unwind info doesn't have an exception handler.
+ _info.lsda = 0;
+ _info.handler = 0;
+ }
+ } else {
+ IMAGE_ARM64_RUNTIME_FUNCTION_ENTRY_XDATA *xdata =
+ reinterpret_cast<IMAGE_ARM64_RUNTIME_FUNCTION_ENTRY_XDATA *>(
+ base + unwindEntry->UnwindData);
+ _info.end_ip = _info.start_ip + xdata->FunctionLength * 4;
+ // Only fill in the handler and LSDA if they're stale.
+ if (pc != getLastPC()) {
+ if (xdata->ExceptionDataPresent) {
+ uint32_t offset = 1; // The main xdata
+ uint32_t codeWords = xdata->CodeWords;
+ uint32_t epilogScopes = xdata->EpilogCount;
+ if (xdata->EpilogCount == 0 && xdata->CodeWords == 0) {
+ uint32_t extensionWord = reinterpret_cast<uint32_t *>(xdata)[1];
+ codeWords = (extensionWord >> 16) & 0xff;
+ epilogScopes = extensionWord & 0xffff;
+ offset++;
+ }
+ if (!xdata->EpilogInHeader)
+ offset += epilogScopes;
+ offset += codeWords;
+ uint32_t *exceptionHandlerInfo =
+ reinterpret_cast<uint32_t *>(xdata) + offset;
+ _dispContext.HandlerData = &exceptionHandlerInfo[1];
+ _dispContext.LanguageHandler = reinterpret_cast<EXCEPTION_ROUTINE *>(
+ base + exceptionHandlerInfo[0]);
+ _info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData);
+ if (_dispContext.LanguageHandler)
----------------
cjacek wrote:
Should this check `exceptionHandlerInfo[0]` instead, like x64 version does?
https://github.com/llvm/llvm-project/pull/137949
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