diff options
Diffstat (limited to 'libcxxabi/src/cxa_personality.cpp')
| -rw-r--r-- | libcxxabi/src/cxa_personality.cpp | 67 |
1 files changed, 39 insertions, 28 deletions
diff --git a/libcxxabi/src/cxa_personality.cpp b/libcxxabi/src/cxa_personality.cpp index 6fd570278de4..15621879e4f8 100644 --- a/libcxxabi/src/cxa_personality.cpp +++ b/libcxxabi/src/cxa_personality.cpp @@ -18,6 +18,17 @@ #include <stdlib.h> #include <assert.h> +// +---------------------------+-----------------------------+---------------+ +// | __cxa_exception | _Unwind_Exception CLNGC++\0 | thrown object | +// +---------------------------+-----------------------------+---------------+ +// ^ +// | +// +-------------------------------------------------------+ +// | +// +---------------------------+-----------------------------+ +// | __cxa_dependent_exception | _Unwind_Exception CLNGC++\1 | +// +---------------------------+-----------------------------+ + namespace __cxxabiv1 { @@ -220,16 +231,16 @@ getTTypeEntry(int64_t typeOffset, const uint8_t* classInfo, uint8_t ttypeEncodin /// @param classInfo our array of type info pointers (to globals) /// @param actionEntry index into above type info array or 0 (clean up). /// We do not support filters. -/// @param exceptionObject thrown _Unwind_Exception instance. +/// @param unwind_exception thrown _Unwind_Exception instance. /// @returns whether or not a type info was found. False is returned if only /// a cleanup was found static bool handleActionValue(const uint8_t* classInfo, uintptr_t actionEntry, - _Unwind_Exception* exceptionObject, uint8_t ttypeEncoding) + _Unwind_Exception* unwind_exception, uint8_t ttypeEncoding) { - __cxa_exception* excp = (__cxa_exception*)(exceptionObject+1) - 1; - const std::type_info* excpType = excp->exceptionType; + __cxa_exception* exception_header = (__cxa_exception*)(unwind_exception+1) - 1; + const std::type_info* excpType = exception_header->exceptionType; const uint8_t* actionPos = (uint8_t*)actionEntry; while (true) { @@ -250,8 +261,8 @@ handleActionValue(const uint8_t* classInfo, uintptr_t actionEntry, // catchType == 0 -> catch (...) if (catchType == 0 || excpType == catchType) { - excp->handlerSwitchValue = typeOffset; - excp->actionRecord = SactionPos; + exception_header->handlerSwitchValue = typeOffset; + exception_header->actionRecord = SactionPos; return true; } } @@ -273,14 +284,14 @@ handleActionValue(const uint8_t* classInfo, uintptr_t actionEntry, // catchTemp and adjustedPtr here. static bool -contains_handler(_Unwind_Exception* exceptionObject, _Unwind_Context* context) +contains_handler(_Unwind_Exception* unwind_exception, _Unwind_Context* context) { - __cxa_exception* excp = (__cxa_exception*)(exceptionObject+1) - 1; + __cxa_exception* exception_header = (__cxa_exception*)(unwind_exception+1) - 1; const uint8_t* lsda = (const uint8_t*)_Unwind_GetLanguageSpecificData(context); - excp->languageSpecificData = lsda; + exception_header->languageSpecificData = lsda; // set adjustedPtr! __cxa_get_exception_ptr and __cxa_begin_catch use it. // TODO: Put it where it is supposed to be and adjust it properly - excp->adjustedPtr = exceptionObject+1; + exception_header->adjustedPtr = unwind_exception+1; if (lsda) { // Get the current instruction pointer and offset it before next @@ -328,11 +339,11 @@ contains_handler(_Unwind_Exception* exceptionObject, _Unwind_Context* context) actionEntry += ((uintptr_t)actionTableStart) - 1; if ((start <= pcOffset) && (pcOffset < (start + length))) { - excp->catchTemp = (void*)(funcStart + landingPad); + exception_header->catchTemp = (void*)(funcStart + landingPad); if (actionEntry) return handleActionValue(classInfo, actionEntry, - exceptionObject, + unwind_exception, ttypeEncoding); // Note: Only non-clean up handlers are marked as // found. Otherwise the clean up handlers will be @@ -348,24 +359,24 @@ contains_handler(_Unwind_Exception* exceptionObject, _Unwind_Context* context) static _Unwind_Reason_Code -transfer_control_to_landing_pad(_Unwind_Exception* exceptionObject, +transfer_control_to_landing_pad(_Unwind_Exception* unwind_exception, _Unwind_Context* context) { - __cxa_exception* excp = (__cxa_exception*)(exceptionObject+1) - 1; - _Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)exceptionObject); - _Unwind_SetGR(context, __builtin_eh_return_data_regno(1), excp->handlerSwitchValue); - _Unwind_SetIP(context, (uintptr_t)excp->catchTemp); + __cxa_exception* exception_header = (__cxa_exception*)(unwind_exception+1) - 1; + _Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)unwind_exception); + _Unwind_SetGR(context, __builtin_eh_return_data_regno(1), exception_header->handlerSwitchValue); + _Unwind_SetIP(context, (uintptr_t)exception_header->catchTemp); return _URC_INSTALL_CONTEXT; } static _Unwind_Reason_Code -perform_cleanup(_Unwind_Exception* exceptionObject, _Unwind_Context* context) +perform_cleanup(_Unwind_Exception* unwind_exception, _Unwind_Context* context) { - __cxa_exception* excp = (__cxa_exception*)(exceptionObject+1) - 1; - _Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)exceptionObject); + __cxa_exception* exception_header = (__cxa_exception*)(unwind_exception+1) - 1; + _Unwind_SetGR(context, __builtin_eh_return_data_regno(0), (uintptr_t)unwind_exception); _Unwind_SetGR(context, __builtin_eh_return_data_regno(1), 0); - _Unwind_SetIP(context, (uintptr_t)excp->catchTemp); + _Unwind_SetIP(context, (uintptr_t)exception_header->catchTemp); return _URC_INSTALL_CONTEXT; } @@ -376,13 +387,13 @@ perform_cleanup(_Unwind_Exception* exceptionObject, _Unwind_Context* context) // == _UA_CLEANUP_PHASE, or // == _UA_CLEANUP_PHASE | _UA_HANDLER_FRAME, or // == _UA_CLEANUP_PHASE | _UA_FORCE_UNWIND -// exceptionObject != nullptr +// unwind_exception != nullptr // context != nullptr _Unwind_Reason_Code __gxx_personality_v0(int version, _Unwind_Action actions, uint64_t exceptionClass, - _Unwind_Exception* exceptionObject, _Unwind_Context* context) + _Unwind_Exception* unwind_exception, _Unwind_Context* context) { - if (version == 1 && exceptionObject != 0 && context != 0) + if (version == 1 && unwind_exception != 0 && context != 0) { bool native_exception = (exceptionClass & 0xFFFFFF00) == 0x432B2B00; bool force_unwind = actions & _UA_FORCE_UNWIND; @@ -392,7 +403,7 @@ __gxx_personality_v0(int version, _Unwind_Action actions, uint64_t exceptionClas { if (actions & _UA_CLEANUP_PHASE) return _URC_FATAL_PHASE1_ERROR; - if (contains_handler(exceptionObject, context)) + if (contains_handler(unwind_exception, context)) return _URC_HANDLER_FOUND; return _URC_CONTINUE_UNWIND; } @@ -401,10 +412,10 @@ __gxx_personality_v0(int version, _Unwind_Action actions, uint64_t exceptionClas if (actions & _UA_HANDLER_FRAME) { // return _URC_INSTALL_CONTEXT or _URC_FATAL_PHASE2_ERROR - return transfer_control_to_landing_pad(exceptionObject, context); + return transfer_control_to_landing_pad(unwind_exception, context); } // return _URC_CONTINUE_UNWIND or _URC_FATAL_PHASE2_ERROR - return perform_cleanup(exceptionObject, context); + return perform_cleanup(unwind_exception, context); } } else // foreign exception or force_unwind @@ -420,7 +431,7 @@ __gxx_personality_v0(int version, _Unwind_Action actions, uint64_t exceptionClas if (actions & _UA_HANDLER_FRAME) return _URC_FATAL_PHASE2_ERROR; // return _URC_CONTINUE_UNWIND or _URC_FATAL_PHASE2_ERROR - return perform_cleanup(exceptionObject, context); + return perform_cleanup(unwind_exception, context); } } } |