forked from OSchip/llvm-project
124 lines
4.6 KiB
C++
124 lines
4.6 KiB
C++
//===------------------------- cxa_default_handlers.cpp -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//
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// This file implements the default terminate_handler and unexpected_handler.
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//===----------------------------------------------------------------------===//
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#include <stdexcept>
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#include <new>
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#include <exception>
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#include "abort_message.h"
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#include "config.h" // For __sync_swap
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#include "cxxabi.h"
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#include "cxa_handlers.hpp"
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#include "cxa_exception.hpp"
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#include "private_typeinfo.h"
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static const char* cause = "uncaught";
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__attribute__((noreturn))
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static void default_terminate_handler()
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{
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// If there might be an uncaught exception
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using namespace __cxxabiv1;
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__cxa_eh_globals* globals = __cxa_get_globals_fast();
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if (globals)
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{
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__cxa_exception* exception_header = globals->caughtExceptions;
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// If there is an uncaught exception
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if (exception_header)
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{
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_Unwind_Exception* unwind_exception =
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reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
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bool native_exception =
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(unwind_exception->exception_class & get_vendor_and_language) ==
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(kOurExceptionClass & get_vendor_and_language);
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if (native_exception)
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{
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void* thrown_object =
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unwind_exception->exception_class == kOurDependentExceptionClass ?
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((__cxa_dependent_exception*)exception_header)->primaryException :
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exception_header + 1;
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const __shim_type_info* thrown_type =
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static_cast<const __shim_type_info*>(exception_header->exceptionType);
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// Try to get demangled name of thrown_type
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int status;
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char buf[1024];
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size_t len = sizeof(buf);
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const char* name = __cxa_demangle(thrown_type->name(), buf, &len, &status);
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if (status != 0)
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name = thrown_type->name();
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// If the uncaught exception can be caught with std::exception&
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const __shim_type_info* catch_type =
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static_cast<const __shim_type_info*>(&typeid(std::exception));
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if (catch_type->can_catch(thrown_type, thrown_object))
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{
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// Include the what() message from the exception
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const std::exception* e = static_cast<const std::exception*>(thrown_object);
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abort_message("terminating with %s exception of type %s: %s",
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cause, name, e->what());
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}
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else
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// Else just note that we're terminating with an exception
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abort_message("terminating with %s exception of type %s",
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cause, name);
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}
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else
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// Else we're terminating with a foreign exception
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abort_message("terminating with %s foreign exception", cause);
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}
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}
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// Else just note that we're terminating
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abort_message("terminating");
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}
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__attribute__((noreturn))
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static void default_unexpected_handler()
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{
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cause = "unexpected";
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std::terminate();
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}
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//
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// Global variables that hold the pointers to the current handler
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//
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std::terminate_handler __cxa_terminate_handler = default_terminate_handler;
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std::unexpected_handler __cxa_unexpected_handler = default_unexpected_handler;
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// In the future these will become:
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// std::atomic<std::terminate_handler> __cxa_terminate_handler(default_terminate_handler);
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// std::atomic<std::unexpected_handler> __cxa_unexpected_handler(default_unexpected_handler);
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namespace std
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{
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unexpected_handler
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set_unexpected(unexpected_handler func) _NOEXCEPT
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{
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if (func == 0)
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func = default_unexpected_handler;
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return __atomic_exchange_n(&__cxa_unexpected_handler, func,
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__ATOMIC_ACQ_REL);
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// Using of C++11 atomics this should be rewritten
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// return __cxa_unexpected_handler.exchange(func, memory_order_acq_rel);
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}
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terminate_handler
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set_terminate(terminate_handler func) _NOEXCEPT
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{
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if (func == 0)
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func = default_terminate_handler;
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return __atomic_exchange_n(&__cxa_terminate_handler, func,
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__ATOMIC_ACQ_REL);
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// Using of C++11 atomics this should be rewritten
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// return __cxa_terminate_handler.exchange(func, memory_order_acq_rel);
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}
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}
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