50 lines
986 B
C++
50 lines
986 B
C++
|
/* cxa.cc
|
||
|
|
* vim: set tw=80:
|
||
|
|
* Eryn Wells <eryn@erynwells.me>
|
||
|
|
*/
|
||
|
|
/**
|
||
|
|
* Implements some functions required by the C++ ABI so that local static
|
||
|
|
* variables can be initialized properly.
|
||
|
|
*/
|
||
|
|
|
||
|
|
namespace __cxxabiv1 {
|
||
|
|
|
||
|
|
// 64-bit integer type to service as mutex-like guard.
|
||
|
|
__extension__ typedef int __guard __attribute__((mode(__DI__)));
|
||
|
|
|
||
|
|
extern "C" {
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TODO: The functions below are required by the C++ ABI and should be thread
|
||
|
|
* safe. Since Polka currently has no threads, it should be fine to do this
|
||
|
|
* without any actual locking. Once/If I add threading, I need to come back here
|
||
|
|
* and add an actual mutex with a test-and-set.
|
||
|
|
*
|
||
|
|
* See http://wiki.osdev.org/C%2B%2B#Local_Static_Variables_.28GCC_Only.29
|
||
|
|
* See the Intel XCHG instruction
|
||
|
|
*/
|
||
|
|
|
||
|
|
int
|
||
|
|
__cxa_guard_acquire(__guard *g)
|
||
|
|
{
|
||
|
|
return !*(g);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void
|
||
|
|
__cxa_guard_release(__guard *g)
|
||
|
|
{
|
||
|
|
*g = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void
|
||
|
|
__cxa_guard_abort(__guard *)
|
||
|
|
{
|
||
|
|
// TODO: What would be useful to do here?
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* namespace __cxxabiv1 */
|