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//===-- asan_win_dynamic_runtime_thunk.cpp --------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// This file defines things that need to be present for application modules
// that are dynamic linked with the C Runtime.
//
//===----------------------------------------------------------------------===//
#ifdef SANITIZER_DYNAMIC_RUNTIME_THUNK
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# include "asan_win_common_runtime_thunk.h"
# include "sanitizer_common/sanitizer_win_defs.h"
////////////////////////////////////////////////////////////////////////////////
// For some reason, the MD CRT doesn't call the C/C++ terminators during on DLL
// unload or on exit. ASan relies on LLVM global_dtors to call
// __asan_unregister_globals on these events, which unfortunately doesn't work
// with the MD runtime, see PR22545 for the details.
// To work around this, for each DLL we schedule a call to UnregisterGlobals
// using atexit() that calls a small subset of C terminators
// where LLVM global_dtors is placed. Fingers crossed, no other C terminators
// are there.
extern "C" int __cdecl atexit(void(__cdecl *f)(void));
extern "C" void __cdecl _initterm(void *a, void *b);
namespace {
__declspec(allocate(".CRT$XTW")) void *before_global_dtors = 0;
__declspec(allocate(".CRT$XTY")) void *after_global_dtors = 0;
void UnregisterGlobals() {
_initterm(&before_global_dtors, &after_global_dtors);
}
int ScheduleUnregisterGlobals() { return atexit(UnregisterGlobals); }
} // namespace
// We need to call 'atexit(UnregisterGlobals);' as early as possible, but after
// atexit() is initialized (.CRT$XIC). As this is executed before C++
// initializers (think ctors for globals), UnregisterGlobals gets executed after
// dtors for C++ globals.
extern "C" __declspec(allocate(".CRT$XID")) int (
*__asan_schedule_unregister_globals)() = ScheduleUnregisterGlobals;
WIN_FORCE_LINK(__asan_schedule_unregister_globals)
#endif // SANITIZER_DYNAMIC_RUNTIME_THUNK
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