banan-os/userspace/libraries/LibC/icxxabi.cpp

65 lines
1.4 KiB
C++

#include <BAN/Assert.h>
#include <stdint.h>
#include <stddef.h>
#define ATEXIT_MAX_FUNCS 128
struct atexit_func_entry_t
{
void(*func)(void*);
void* arg;
void* dso_handle;
};
static atexit_func_entry_t __atexit_funcs[ATEXIT_MAX_FUNCS];
static size_t __atexit_func_count = 0;
extern "C" int __cxa_atexit(void(*func)(void*), void* arg, void* dso_handle)
{
if (__atexit_func_count >= ATEXIT_MAX_FUNCS)
return -1;
auto& atexit_func = __atexit_funcs[__atexit_func_count++];
atexit_func.func = func;
atexit_func.arg = arg;
atexit_func.dso_handle = dso_handle;
return 0;
};
extern "C" void __cxa_finalize(void* f)
{
for (size_t i = __atexit_func_count; i > 0; i--)
{
auto& atexit_func = __atexit_funcs[i - 1];
if (atexit_func.func == nullptr)
continue;
if (f == nullptr || f == atexit_func.func)
{
atexit_func.func(atexit_func.arg);
atexit_func.func = nullptr;
}
}
};
namespace __cxxabiv1
{
using __guard = uint64_t;
extern "C" int __cxa_guard_acquire (__guard* g)
{
uint8_t* byte = reinterpret_cast<uint8_t*>(g);
uint8_t zero = 0;
return __atomic_compare_exchange_n(byte, &zero, 1, false, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
}
extern "C" void __cxa_guard_release (__guard* g)
{
uint8_t* byte = reinterpret_cast<uint8_t*>(g);
__atomic_store_n(byte, 0, __ATOMIC_RELEASE);
}
extern "C" void __cxa_guard_abort (__guard*)
{
ASSERT_NOT_REACHED();
}
}