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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Define the necessary code and global data to look for kDebugOnStart command | |
6 // line argument. When the command line argument is detected, it invokes the | |
7 // debugger, if no system-wide debugger is registered, a debug break is done. | |
8 | |
9 #ifndef BASE_DEBUG_ON_START_H_ | |
10 #define BASE_DEBUG_ON_START_H_ | |
11 #pragma once | |
12 | |
13 #include "base/basictypes.h" | |
14 | |
15 // This only works on Windows. | |
16 #if defined(OS_WIN) | |
17 | |
18 #ifndef DECLSPEC_SELECTANY | |
19 #define DECLSPEC_SELECTANY __declspec(selectany) | |
20 #endif | |
21 | |
22 // Debug on start functions and data. | |
23 class DebugOnStart { | |
24 public: | |
25 // Expected function type in the .CRT$XI* section. | |
26 // Note: See VC\crt\src\internal.h for reference. | |
27 typedef int (__cdecl *PIFV)(void); | |
28 | |
29 // Looks at the command line for kDebugOnStart argument. If found, it invokes | |
30 // the debugger, if this fails, it crashes. | |
31 static int __cdecl Init(); | |
32 | |
33 // Returns true if the 'argument' is present in the 'command_line'. It does | |
34 // not use the CRT, only Kernel32 functions. | |
35 static bool FindArgument(wchar_t* command_line, const char* argument); | |
36 }; | |
37 | |
38 // Set the function pointer to our function to look for a crash on start. The | |
39 // XIB section is started pretty early in the program initialization so in | |
40 // theory it should be called before any user created global variable | |
41 // initialization code and CRT initialization code. | |
42 // Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference. | |
43 #ifdef _WIN64 | |
44 | |
45 // "Fix" the segment. On x64, the .CRT segment is merged into the .rdata segment | |
46 // so it contains const data only. | |
47 #pragma const_seg(push, ".CRT$XIB") | |
48 // Declare the pointer so the CRT will find it. | |
49 extern const DebugOnStart::PIFV debug_on_start; | |
50 DECLSPEC_SELECTANY const DebugOnStart::PIFV debug_on_start = | |
51 &DebugOnStart::Init; | |
52 // Fix back the segment. | |
53 #pragma const_seg(pop) | |
54 | |
55 #else // _WIN64 | |
56 | |
57 // "Fix" the segment. On x86, the .CRT segment is merged into the .data segment | |
58 // so it contains non-const data only. | |
59 #pragma data_seg(push, ".CRT$XIB") | |
60 // Declare the pointer so the CRT will find it. | |
61 DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init; | |
62 // Fix back the segment. | |
63 #pragma data_seg(pop) | |
64 | |
65 #endif // _WIN64 | |
66 #endif // defined(OS_WIN) | |
67 | |
68 #endif // BASE_DEBUG_ON_START_H_ | |
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