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Arm fixes in cxa_personality.cpp and a little refactoring.

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llvm-svn: 152966
This commit is contained in:
Howard Hinnant 2012-03-17 00:10:52 +00:00
parent 7de79f3297
commit 0f73197364
1 changed files with 41 additions and 24 deletions
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65
libcxxabi/src/cxa_personality.cpp
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@ -398,6 +398,41 @@ get_thrown_object_ptr(_Unwind_Exception* unwind_exception)
return adjustedPtr;
}
namespace
{
struct scan_results
{
int64_t ttypeIndex; // > 0 catch handler, < 0 exception spec handler, == 0 a cleanup
const uint8_t* actionRecord; // Currently unused. Retained to ease future maintenance.
const uint8_t* languageSpecificData; // Needed only for __cxa_call_unexpected
uintptr_t landingPad; // null -> nothing found, else something found
void* adjustedPtr; // Used in cxa_exception.cpp
_Unwind_Reason_Code reason; // One of _URC_FATAL_PHASE1_ERROR,
// _URC_FATAL_PHASE2_ERROR,
// _URC_CONTINUE_UNWIND,
// _URC_HANDLER_FOUND
};
} // unnamed namespace
static
void
set_registers(_Unwind_Exception* unwind_exception, _Unwind_Context* context,
const scan_results& results)
{
#if __arm__
_Unwind_SetGR(context, 0, reinterpret_cast<uintptr_t>(unwind_exception));
_Unwind_SetGR(context, 1, static_cast<uintptr_t>(results.ttypeIndex));
#else
_Unwind_SetGR(context, __builtin_eh_return_data_regno(0),
reinterpret_cast<uintptr_t>(unwind_exception));
_Unwind_SetGR(context, __builtin_eh_return_data_regno(1),
static_cast<uintptr_t>(results.ttypeIndex));
#endif
_Unwind_SetIP(context, results.landingPad);
}
/*
There are 3 types of scans needed:
@ -419,24 +454,6 @@ get_thrown_object_ptr(_Unwind_Exception* unwind_exception)
_UA_CLEANUP_PHASE && !_UA_HANDLER_FRAME
*/
namespace
{
struct scan_results
{
int64_t ttypeIndex; // > 0 catch handler, < 0 exception spec handler, == 0 a cleanup
const uint8_t* actionRecord; // Currently unused. Retained to ease future maintenance.
const uint8_t* languageSpecificData; // Needed only for __cxa_call_unexpected
uintptr_t landingPad; // null -> nothing found, else something found
void* adjustedPtr; // Used in cxa_exception.cpp
_Unwind_Reason_Code reason; // One of _URC_FATAL_PHASE1_ERROR,
// _URC_FATAL_PHASE2_ERROR,
// _URC_CONTINUE_UNWIND,
// _URC_HANDLER_FOUND
};
} // unnamed namespace
static
void
scan_eh_tab(scan_results& results, _Unwind_Action actions, bool native_exception,
@ -554,6 +571,7 @@ scan_eh_tab(scan_results& results, _Unwind_Action actions, bool native_exception
#endif // __arm__
{
// Found the call site containing ip.
#if !__arm__
if (landingPad == 0)
{
// No handler here
@ -561,6 +579,9 @@ scan_eh_tab(scan_results& results, _Unwind_Action actions, bool native_exception
return;
}
landingPad = (uintptr_t)lpStart + landingPad;
#else // __arm__
++landingPad;
#endif // __arm__
if (actionEntry == 0)
{
// Found a cleanup
@ -878,9 +899,7 @@ __gxx_personality_v0
call_terminate(native_exception, unwind_exception);
}
// Jump to the handler
_Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)unwind_exception);
_Unwind_SetGR(context, __builtin_eh_return_data_regno(1), (uintptr_t)results.ttypeIndex);
_Unwind_SetIP(context, results.landingPad);
set_registers(unwind_exception, context, results);
return _URC_INSTALL_CONTEXT;
}
// Either we didn't do a phase 1 search (due to forced unwinding), or
@ -890,9 +909,7 @@ __gxx_personality_v0
if (results.reason == _URC_HANDLER_FOUND)
{
// Found a non-catching handler. Jump to it:
_Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)unwind_exception);
_Unwind_SetGR(context, __builtin_eh_return_data_regno(1), (uintptr_t)results.ttypeIndex);
_Unwind_SetIP(context, results.landingPad);
set_registers(unwind_exception, context, results);
return _URC_INSTALL_CONTEXT;
}
// Did not find a cleanup. Return the results of the scan