| //===-- asan_win_uar_thunk.cc ---------------------------------------------===// |
| // |
| // 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 |
