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