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LibC: Support exit time destructors per the Itanium C++ ABI
Implement __cxa_atexit and __cxa_finalize per the Itanium spec, and convert stdlib's atexit and exit() to to call them instead of a custom 'C-only' atexit implementation.
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2 changed files with 52 additions and 9 deletions
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@ -106,14 +106,13 @@ static inline T strtol_impl(const char* nptr, char** endptr, int base)
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extern "C" {
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typedef void (*__atexit_handler)();
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static int __atexit_handler_count = 0;
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static __atexit_handler __atexit_handlers[32];
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// Itanium C++ ABI methods defined in crt0.cpp
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extern int __cxa_atexit(void (*function)(void*), void* paramter, void* dso_handle);
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extern void __cxa_finalize(void* dso_handle);
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void exit(int status)
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{
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for (int i = 0; i < __atexit_handler_count; ++i)
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__atexit_handlers[i]();
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__cxa_finalize(nullptr);
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extern void _fini();
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_fini();
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fflush(stdout);
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@ -122,11 +121,14 @@ void exit(int status)
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ASSERT_NOT_REACHED();
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}
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static void __atexit_to_cxa_atexit(void* handler)
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{
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reinterpret_cast<void (*)()>(handler)();
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}
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int atexit(void (*handler)())
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{
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ASSERT(__atexit_handler_count < 32);
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__atexit_handlers[__atexit_handler_count++] = handler;
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return 0;
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return __cxa_atexit(__atexit_to_cxa_atexit, (void*)handler, nullptr);
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}
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void abort()
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