libsanitizer/sanitizer_common/sanitizer_win_weak_interception.h

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