1 //===-- asan_globals_win.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 // Global registration code that is linked into every Windows DLL and EXE.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "asan_interface_internal.h"
15 #if SANITIZER_WINDOWS
16
17 namespace __asan {
18
19 #pragma section(".ASAN$GA", read, write) // NOLINT
20 #pragma section(".ASAN$GZ", read, write) // NOLINT
21 extern "C" __declspec(allocate(".ASAN$GA"))
22 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {};
23 extern "C" __declspec(allocate(".ASAN$GZ"))
24 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {};
25 #pragma comment(linker, "/merge:.ASAN=.data")
26
call_on_globals(void (* hook)(__asan_global *,uptr))27 static void call_on_globals(void (*hook)(__asan_global *, uptr)) {
28 __asan_global *start = &__asan_globals_start + 1;
29 __asan_global *end = &__asan_globals_end;
30 uptr bytediff = (uptr)end - (uptr)start;
31 if (bytediff % sizeof(__asan_global) != 0) {
32 #if defined(SANITIZER_DLL_THUNK) || defined(SANITIZER_DYNAMIC_RUNTIME_THUNK)
33 __debugbreak();
34 #else
35 CHECK("corrupt asan global array");
36 #endif
37 }
38 // We know end >= start because the linker sorts the portion after the dollar
39 // sign alphabetically.
40 uptr n = end - start;
41 hook(start, n);
42 }
43
register_dso_globals()44 static void register_dso_globals() {
45 call_on_globals(&__asan_register_globals);
46 }
47
unregister_dso_globals()48 static void unregister_dso_globals() {
49 call_on_globals(&__asan_unregister_globals);
50 }
51
52 // Register globals
53 #pragma section(".CRT$XCU", long, read) // NOLINT
54 #pragma section(".CRT$XTX", long, read) // NOLINT
55 extern "C" __declspec(allocate(".CRT$XCU"))
56 void (*const __asan_dso_reg_hook)() = ®ister_dso_globals;
57 extern "C" __declspec(allocate(".CRT$XTX"))
58 void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals;
59
60 } // namespace __asan
61
62 #endif // SANITIZER_WINDOWS
63