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Fix _Unwind_Backtrace for libc++abi built with libgcc.
Implement an undocumented _US_FORCE_UNWIND flag for force unwinding. llvm-svn: 226820
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@ -63,6 +63,8 @@ typedef uint32_t _Unwind_State;
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static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME = 0;
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static const _Unwind_State _US_UNWIND_FRAME_STARTING = 1;
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static const _Unwind_State _US_UNWIND_FRAME_RESUME = 2;
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/* Undocumented flag for force unwinding. */
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static const _Unwind_State _US_FORCE_UNWIND = 8;
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typedef uint32_t _Unwind_EHT_Header;
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@ -1101,9 +1101,16 @@ __gxx_personality_v0(_Unwind_State state,
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_Unwind_SetGR(context, REG_UCB, reinterpret_cast<uint32_t>(unwind_exception));
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#endif
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// Check the undocumented force unwinding behavior
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bool is_force_unwinding = state & _US_FORCE_UNWIND;
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state &= ~_US_FORCE_UNWIND;
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scan_results results;
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switch (state) {
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case _US_VIRTUAL_UNWIND_FRAME:
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if (is_force_unwinding)
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return continue_unwind(unwind_exception, context);
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// Phase 1 search: All we're looking for in phase 1 is a handler that halts unwinding
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scan_eh_tab(results, _UA_SEARCH_PHASE, native_exception, unwind_exception, context);
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if (results.reason == _URC_HANDLER_FOUND)
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@ -1119,6 +1126,11 @@ __gxx_personality_v0(_Unwind_State state,
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return results.reason;
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case _US_UNWIND_FRAME_STARTING:
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// TODO: Support force unwinding in the phase 2 search.
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// NOTE: In order to call the cleanup functions, _Unwind_ForcedUnwind()
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// will call this personality function with (_US_FORCE_UNWIND |
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// _US_UNWIND_FRAME_STARTING).
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// Phase 2 search
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if (unwind_exception->barrier_cache.sp == _Unwind_GetGR(context, REG_SP))
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{
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