Usermode/Libraries/libc++.so_src/exception_handling.cc

   1 /*
   2  */
   3 #include <typeinfo>
   4 #include <cstdint>
   5
   6 typedef void *(unexpected_handler)(void);
   7 typedef void *(terminate_handler)(void);
   8
   9 struct _Unwind_Context;
  10
  11 typedef enum {
  12         _URC_NO_REASON = 0,
  13         _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
  14         _URC_FATAL_PHASE2_ERROR = 2,
  15         _URC_FATAL_PHASE1_ERROR = 3,
  16         _URC_NORMAL_STOP = 4,
  17         _URC_END_OF_STACK = 5,
  18         _URC_HANDLER_FOUND = 6,
  19         _URC_INSTALL_CONTEXT = 7,
  20         _URC_CONTINUE_UNWIND = 8
  21 } _Unwind_Reason_Code;
  22
  23 typedef void    (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code reason, struct _Unwind_Exception *exc);
  24
  25 struct _Unwind_Exception
  26 {
  27         uint64_t        exception_class;
  28         _Unwind_Exception_Cleanup_Fn    exception_cleanup;
  29         uint64_t        private_1;
  30         uint64_t        private_2;
  31 };
  32
  33 struct __cxa_exception
  34 {
  35         std::type_info* exceptionType;
  36         void (*exceptionDestructor)(void *);
  37         unexpected_handler      unexpectedHandler;
  38         terminate_handler       terminateHandler;
  39         __cxa_exception*        nextException;
  40
  41         int     handlerCount;
  42
  43         int     handlerSwitchValue;
  44         const char*     actionRecord;
  45         const char*     languageSpecificData;
  46         void*   catchTemp;
  47         void*   adjustedPtr;
  48
  49         _Unwind_Exception       unwindHeader;
  50 };
  51
  52  int    uncaught_exception_count;
  53 __cxa_exception *uncaught_exception_top;
  54
  55 extern "C" void __cxa_call_unexpected(void *)
  56 {
  57         // An unexpected exception was thrown from a function that lists its possible exceptions
  58         for(;;);
  59 }
  60
  61 extern "C" void *__cxa_begin_catch(void *exceptionObject)
  62 {
  63         struct __cxa_exception  *except = static_cast<__cxa_exception*>( exceptionObject );
  64         except --;
  65
  66         except->handlerCount ++;
  67
  68         except->nextException = uncaught_exception_top;
  69         uncaught_exception_top = except;
  70
  71         uncaught_exception_count --;
  72
  73         return except;
  74 }
  75
  76 extern "C" void __cxa_end_catch()
  77 {
  78         struct __cxa_exception  *except = uncaught_exception_top;
  79         except->handlerCount --;
  80         uncaught_exception_top = except->nextException;
  81
  82         if( except->handlerCount == 0 ) {
  83                 //__cxa_free_exception(except+1);
  84         }
  85 }
  86