compiler-rt/lib/sanitizer_common/sanitizer_win_weak_interception.h

   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