1//===-- asan_globals_win.cpp ----------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Global registration code that is linked into every Windows DLL and EXE.
10//
11//===----------------------------------------------------------------------===//
12
13#include "asan_interface_internal.h"
14#if SANITIZER_WINDOWS
15
16namespace __asan {
17
18#pragma section(".ASAN$GA", read, write)
19#pragma section(".ASAN$GZ", read, write)
20extern "C" __declspec(allocate(".ASAN$GA"))
21 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {};
22extern "C" __declspec(allocate(".ASAN$GZ"))
23 ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {};
24#pragma comment(linker, "/merge:.ASAN=.data")
25
26static void call_on_globals(void (*hook)(__asan_global *, uptr)) {
27 __asan_global *start = &__asan_globals_start + 1;
28 __asan_global *end = &__asan_globals_end;
29 uptr bytediff = (uptr)end - (uptr)start;
30 if (bytediff % sizeof(__asan_global) != 0) {
31#if defined(SANITIZER_DLL_THUNK) || defined(SANITIZER_DYNAMIC_RUNTIME_THUNK)
32 __debugbreak();
33#else
34 CHECK("corrupt asan global array");
35#endif
36 }
37 // We know end >= start because the linker sorts the portion after the dollar
38 // sign alphabetically.
39 uptr n = end - start;
40 hook(start, n);
41}
42
43static void register_dso_globals() {
44 call_on_globals(&__asan_register_globals);
45}
46
47static void unregister_dso_globals() {
48 call_on_globals(&__asan_unregister_globals);
49}
50
51// Register globals
52#pragma section(".CRT$XCU", long, read)
53#pragma section(".CRT$XTX", long, read)
54extern "C" __declspec(allocate(".CRT$XCU"))
55void (*const __asan_dso_reg_hook)() = &register_dso_globals;
56extern "C" __declspec(allocate(".CRT$XTX"))
57void (*const __asan_dso_unreg_hook)() = &unregister_dso_globals;
58
59} // namespace __asan
60
61#endif // SANITIZER_WINDOWS
62

source code of compiler-rt/lib/asan/asan_globals_win.cpp