diff options
Diffstat (limited to 'exception.cc')
| -rw-r--r-- | exception.cc | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/exception.cc b/exception.cc index 7781ebbebb9f..f94e95e74b0a 100644 --- a/exception.cc +++ b/exception.cc @@ -304,13 +304,17 @@ static pthread_key_t eh_key; static void exception_cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex) { - __cxa_free_exception(static_cast<void*>(ex)); + // Exception layout: + // [__cxa_exception [_Unwind_Exception]] [exception object] + // + // __cxa_free_exception expects a pointer to the exception object + __cxa_free_exception(static_cast<void*>(ex + 1)); } static void dependent_exception_cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex) { - __cxa_free_dependent_exception(static_cast<void*>(ex)); + __cxa_free_dependent_exception(static_cast<void*>(ex + 1)); } /** @@ -340,7 +344,8 @@ static void thread_cleanup(void* thread_info) if (info->foreign_exception_state != __cxa_thread_info::none) { _Unwind_Exception *e = reinterpret_cast<_Unwind_Exception*>(info->globals.caughtExceptions); - e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e); + if (e->exception_cleanup) + e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e); } else { @@ -516,7 +521,7 @@ static void emergency_malloc_free(char *ptr) break; } } - assert(buffer > 0 && + assert(buffer >= 0 && "Trying to free something that is not an emergency buffer!"); // emergency_malloc() is expected to return 0-initialized data. We don't // zero the buffer when allocating it, because the static buffers will @@ -556,7 +561,7 @@ static void free_exception(char *e) { // If this allocation is within the address range of the emergency buffer, // don't call free() because it was not allocated with malloc() - if ((e > emergency_buffer) && + if ((e >= emergency_buffer) && (e < (emergency_buffer + sizeof(emergency_buffer)))) { emergency_malloc_free(e); @@ -1280,12 +1285,13 @@ extern "C" void __cxa_end_catch() if (ti->foreign_exception_state != __cxa_thread_info::none) { - globals->caughtExceptions = 0; if (ti->foreign_exception_state != __cxa_thread_info::rethrown) { _Unwind_Exception *e = reinterpret_cast<_Unwind_Exception*>(ti->globals.caughtExceptions); - e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e); + if (e->exception_cleanup) + e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e); } + globals->caughtExceptions = 0; ti->foreign_exception_state = __cxa_thread_info::none; return; } @@ -1472,6 +1478,15 @@ namespace std return info->globals.uncaughtExceptions != 0; } /** + * Returns the number of exceptions currently being thrown that have not + * been caught. This can occur inside a nested catch statement. + */ + int uncaught_exceptions() throw() + { + __cxa_thread_info *info = thread_info(); + return info->globals.uncaughtExceptions; + } + /** * Returns the current unexpected handler. */ unexpected_handler get_unexpected() throw() |