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LibC: Support exit time destructors per the Itanium C++ ABI

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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.
This commit is contained in:
Andrew Kaster 2019-12-21 15:49:29 -07:00 • committed by Andreas Kling
parent e2dcf27a2e
commit 824bbc7462
2 changed files with 52 additions and 9 deletions
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18
Libraries/LibC/stdlib.cpp
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@ -106,14 +106,13 @@ static inline T strtol_impl(const char* nptr, char** endptr, int base)
extern "C" {
typedef void (*__atexit_handler)();
static int __atexit_handler_count = 0;
static __atexit_handler __atexit_handlers[32];
// Itanium C++ ABI methods defined in crt0.cpp
extern int __cxa_atexit(void (*function)(void*), void* paramter, void* dso_handle);
extern void __cxa_finalize(void* dso_handle);
void exit(int status)
{
for (int i = 0; i < __atexit_handler_count; ++i)
__atexit_handlers[i]();
__cxa_finalize(nullptr);
extern void _fini();
_fini();
fflush(stdout);
@ -122,11 +121,14 @@ void exit(int status)
ASSERT_NOT_REACHED();
}
static void __atexit_to_cxa_atexit(void* handler)
{
reinterpret_cast<void (*)()>(handler)();
}
int atexit(void (*handler)())
{
ASSERT(__atexit_handler_count < 32);
__atexit_handlers[__atexit_handler_count++] = handler;
return 0;
return __cxa_atexit(__atexit_to_cxa_atexit, (void*)handler, nullptr);
}
void abort()