libsanitizer/asan/asan_globals_win.cc

   1 //===-- asan_globals_win.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 // Global registration code that is linked into every Windows DLL and EXE.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "asan_interface_internal.h"
  13 #if SANITIZER_WINDOWS
  14
  15 namespace __asan {
  16
  17 #pragma section(".ASAN$GA", read, write)  // NOLINT
  18 #pragma section(".ASAN$GZ", read, write)  // NOLINT
  19 extern "C" __declspec(allocate(".ASAN$GA"))
  20 __asan_global __asan_globals_start = {};
  21 extern "C" __declspec(allocate(".ASAN$GZ"))
  22 __asan_global __asan_globals_end = {};
  23 #pragma comment(linker, "/merge:.ASAN=.data")
  24
  25 static void call_on_globals(void (*hook)(__asan_global *, uptr)) {
  26   __asan_global *start = &__asan_globals_start + 1;
  27   __asan_global *end = &__asan_globals_end;
  28   uptr bytediff = (uptr)end - (uptr)start;
  29   if (bytediff % sizeof(__asan_global) != 0) {
  30 #ifdef SANITIZER_DLL_THUNK
  31     __debugbreak();
  32 #else
  33     CHECK("corrupt asan global array");
  34 #endif
  35   }
  36   // We know end >= start because the linker sorts the portion after the dollar
  37   // sign alphabetically.
  38   uptr n = end - start;
  39   hook(start, n);
  40 }
  41
  42 static void register_dso_globals() {
  43   call_on_globals(&__asan_register_globals);
  44 }
  45
  46 static void unregister_dso_globals() {
  47   call_on_globals(&__asan_unregister_globals);
  48 }
  49
  50 // Register globals
  51 #pragma section(".CRT$XCU", long, read)  // NOLINT
  52 #pragma section(".CRT$XTX", long, read)  // NOLINT
  53 extern "C" __declspec(allocate(".CRT$XCU"))
  54 void (*const __asan_dso_reg_hook)() = &register_dso_globals;
  55 extern "C" __declspec(allocate(".CRT$XTX"))
  56 void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals;
  57
  58 } // namespace __asan
  59
  60 #endif  // SANITIZER_WINDOWS