diff options
Diffstat (limited to 'lib/asan/asan_win_dynamic_runtime_thunk.cc')
| -rw-r--r-- | lib/asan/asan_win_dynamic_runtime_thunk.cc | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/asan/asan_win_dynamic_runtime_thunk.cc b/lib/asan/asan_win_dynamic_runtime_thunk.cc new file mode 100644 index 0000000000000..3a4de7dbf1fb6 --- /dev/null +++ b/lib/asan/asan_win_dynamic_runtime_thunk.cc @@ -0,0 +1,52 @@ +//===-- asan_win_uar_thunk.cc ---------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file is a part of AddressSanitizer, an address sanity checker. +// +// This file defines things that need to be present in the application modules +// to interact with the ASan DLL runtime correctly and can't be implemented +// using the default "import library" generated when linking the DLL RTL. +// +// This includes: +// - forwarding the detect_stack_use_after_return runtime option +// - installing a custom SEH handler +// +//===----------------------------------------------------------------------===// + +// Only compile this code when buidling asan_dynamic_runtime_thunk.lib +// Using #ifdef rather than relying on Makefiles etc. +// simplifies the build procedure. +#ifdef ASAN_DYNAMIC_RUNTIME_THUNK +extern "C" { +__declspec(dllimport) int __asan_set_seh_filter(); +__declspec(dllimport) int __asan_should_detect_stack_use_after_return(); + +// Define a copy of __asan_option_detect_stack_use_after_return that should be +// used when linking an MD runtime with a set of object files on Windows. +// +// The ASan MD runtime dllexports '__asan_option_detect_stack_use_after_return', +// so normally we would just dllimport it. Unfortunately, the dllimport +// attribute adds __imp_ prefix to the symbol name of a variable. +// Since in general we don't know if a given TU is going to be used +// with a MT or MD runtime and we don't want to use ugly __imp_ names on Windows +// just to work around this issue, let's clone the a variable that is +// constant after initialization anyways. +int __asan_option_detect_stack_use_after_return = + __asan_should_detect_stack_use_after_return(); + +// Set the ASan-specific SEH handler at the end of CRT initialization of each +// module (see asan_win.cc for the details). +// +// Unfortunately, putting a pointer to __asan_set_seh_filter into +// __asan_intercept_seh gets optimized out, so we have to use an extra function. +static int SetSEHFilter() { return __asan_set_seh_filter(); } +#pragma section(".CRT$XIZ", long, read) // NOLINT +__declspec(allocate(".CRT$XIZ")) int (*__asan_seh_interceptor)() = SetSEHFilter; +} +#endif // ASAN_DYNAMIC_RUNTIME_THUNK |