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XFG: made _Execute_once XFG-compatible. #1318

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Merged
StephanTLavavej merged 1 commit into from
Sep 25, 2020
Merged

XFG: made _Execute_once XFG-compatible. #1318

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11 changes: 10 additions & 1 deletion stl/src/xonce.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,17 @@ _CRTIMP2_PURE int __CLRCALL_PURE_OR_CDECL _Execute_once(
once_flag& _Flag, _Execute_once_fp_t _Callback, void* _Pv) noexcept { // wrap Win32 InitOnceExecuteOnce()
static_assert(sizeof(_Flag._Opaque) == sizeof(INIT_ONCE), "invalid size");

// _Execute_once_fp_t and PINIT_ONCE_FN differ in type signature, therefore
// we introduce _Xfg_trampoline which has PINIT_ONCE_FN's type signature and
// calls into _Callback as an _Execute_once_fp_t for XFG compatibility.

PINIT_ONCE_FN _Xfg_trampoline = [](PINIT_ONCE _InitOnce, PVOID _Parameter, PVOID* _Context) {
const auto _Callback = reinterpret_cast<_Execute_once_fp_t>(_Context);
return static_cast<BOOL>(_Callback(_InitOnce, _Parameter, nullptr));
};

return __crtInitOnceExecuteOnce(
reinterpret_cast<PINIT_ONCE>(&_Flag._Opaque), reinterpret_cast<PINIT_ONCE_FN>(_Callback), _Pv, nullptr);
reinterpret_cast<PINIT_ONCE>(&_Flag._Opaque), _Xfg_trampoline, _Pv, reinterpret_cast<PVOID*>(_Callback));
}

[[noreturn]] _CRTIMP2_PURE void __CLRCALL_PURE_OR_CDECL
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