1 //===-- sanitizer_win_weak_interception.h ---------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // This header provide helper macros to delegate calls of weak functions to the 9 // implementation in the main executable when a strong definition is present. 10 //===----------------------------------------------------------------------===// 11 #ifndef SANITIZER_WIN_WEAK_INTERCEPTION_H 12 #define SANITIZER_WIN_WEAK_INTERCEPTION_H 13 #include "sanitizer_internal_defs.h" 14 15 namespace __sanitizer { 16 int interceptWhenPossible(uptr dll_function, const char *real_function); 17 } 18 19 // ----------------- Function interception helper macros -------------------- // 20 // Weak functions, could be redefined in the main executable, but that is not 21 // necessary, so we shouldn't die if we can not find a reference. 22 #define INTERCEPT_WEAK(Name) interceptWhenPossible((uptr) Name, #Name); 23 24 #define INTERCEPT_SANITIZER_WEAK_FUNCTION(Name) \ 25 static int intercept_##Name() { \ 26 return __sanitizer::interceptWhenPossible((__sanitizer::uptr) Name, #Name);\ 27 } \ 28 __pragma(section(".WEAK$M", long, read)) \ 29 __declspec(allocate(".WEAK$M")) int (*__weak_intercept_##Name)() = \ 30 intercept_##Name; 31 32 #endif // SANITIZER_WIN_WEAK_INTERCEPTION_H 33