[libunwind] Support for leaf function unwinding.
Unwinding leaf function is useful in cases when the backtrace finds a
leaf function for example when it caused a signal.
This patch also add the support for the DW_CFA_undefined because it marks
the end of the frames.
Ryan Prichard provided code for the tests.
Reviewed By: #libunwind, mstorsjo
Differential Revision: https://reviews.llvm.org/D83573
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 23bef7ee9923b1262326981960397e8cd95d6923
diff --git a/src/DwarfParser.hpp b/src/DwarfParser.hpp
index c98c4f9..1ce2cf2 100644
--- a/src/DwarfParser.hpp
+++ b/src/DwarfParser.hpp
@@ -69,6 +69,7 @@
};
enum RegisterSavedWhere {
kRegisterUnused,
+ kRegisterUndefined,
kRegisterInCFA,
kRegisterOffsetFromCFA,
kRegisterInRegister,
@@ -503,7 +504,7 @@
"malformed DW_CFA_undefined DWARF unwind, reg too big");
return false;
}
- results->setRegisterLocation(reg, kRegisterUnused, initialState);
+ results->setRegisterLocation(reg, kRegisterUndefined, initialState);
_LIBUNWIND_TRACE_DWARF("DW_CFA_undefined(reg=%" PRIu64 ")\n", reg);
break;
case DW_CFA_same_value: