asan_preinit.cc revision 33934fff43c5813394fe21e68b8d82b672013465 
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  __attribute__((section(".preinit_array"), used))
22  void (*__asan_preinit)(void) =__asan_init;
23#elif defined(_WIN32) && 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
30