libsanitizer/asan/asan_preinit.cc

   1 //===-- asan_preinit.cc ---------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // Call __asan_init at the very early stage of process startup.
  11 // On Linux we use .preinit_array section (unless PIC macro is defined).
  12 //===----------------------------------------------------------------------===//
  13 #include "asan_internal.h"
  14
  15 #if ASAN_USE_PREINIT_ARRAY && !defined(PIC)
  16   // On Linux, we force __asan_init to be called before anyone else
  17   // by placing it into .preinit_array section.
  18   // FIXME: do we have anything like this on Mac?
  19   // The symbol is called __local_asan_preinit, because it's not intended to be
  20   // exported.
  21   __attribute__((section(".preinit_array"), used))
  22   void (*__local_asan_preinit)(void) = __asan_init;
  23 #elif SANITIZER_WINDOWS && defined(_DLL)
  24   // On Windows, when using dynamic CRT (/MD), we can put a pointer
  25   // to __asan_init into the global list of C initializers.
  26   // See crt0dat.c in the CRT sources for the details.
  27   #pragma section(".CRT$XIB", long, read)  // NOLINT
  28   __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init;
  29 #endif