asan_preinit.cc revision a7e8c97e8af9e375ea37cf03a3da0cd645d95d6a 
1//===-- asan_preinit.cc ---------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of AddressSanitizer, an address sanity checker.
11//
12// Call __asan_init at the very early stage of process startup.
13// On Linux we use .preinit_array section (unless PIC macro is defined).
14//===----------------------------------------------------------------------===//
15#include "asan_internal.h"
16
17#if ASAN_USE_PREINIT_ARRAY && !defined(PIC)
18  // On Linux, we force __asan_init to be called before anyone else
19  // by placing it into .preinit_array section.
20  // FIXME: do we have anything like this on Mac?
21  // The symbol is called __local_asan_preinit, because it's not intended to be
22  // exported.
23  __attribute__((section(".preinit_array"), used))
24  void (*__local_asan_preinit)(void) = __asan_init;
25#elif SANITIZER_WINDOWS && defined(_DLL)
26  // On Windows, when using dynamic CRT (/MD), we can put a pointer
27  // to __asan_init into the global list of C initializers.
28  // See crt0dat.c in the CRT sources for the details.
29  #pragma section(".CRT$XIB", long, read)  // NOLINT
30  __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init;
31#endif
32