ipc/chromium/src/base/debug_on_start.h@6474c204b198
ipc/chromium/src/base/debug_on_start.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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.
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.
9 #ifndef BASE_DEBUG_ON_START_H_
10 #define BASE_DEBUG_ON_START_H_
12 #include "base/basictypes.h"
14 // This only works on MSVC.
15 #if defined(COMPILER_MSVC)
17 #ifndef DECLSPEC_SELECTANY
18 #define DECLSPEC_SELECTANY __declspec(selectany)
19 #endif
21 // Debug on start functions and data.
22 class DebugOnStart {
23 public:
24 // Expected function type in the .CRT$XI* section.
25 // Note: See VC\crt\src\internal.h for reference.
26 typedef int (__cdecl *PIFV)(void);
28 // Looks at the command line for kDebugOnStart argument. If found, it invokes
29 // the debugger, if this fails, it crashes.
30 static int __cdecl Init();
32 // Returns true if the 'argument' is present in the 'command_line'. It does
33 // not use the CRT, only Kernel32 functions.
34 static bool FindArgument(wchar_t* command_line, const wchar_t* argument);
35 };
37 // Set the function pointer to our function to look for a crash on start. The
38 // XIB section is started pretty early in the program initialization so in
39 // theory it should be called before any user created global variable
40 // initialization code and CRT initialization code.
41 // Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference.
42 #ifdef _WIN64
44 // "Fix" the segment. On x64, the .CRT segment is merged into the .rdata segment
45 // so it contains const data only.
46 #pragma const_seg(push, ".CRT$XIB")
47 // Declare the pointer so the CRT will find it.
48 extern const DebugOnStart::PIFV debug_on_start;
49 DECLSPEC_SELECTANY const DebugOnStart::PIFV debug_on_start =
50 &DebugOnStart::Init;
51 // Fix back the segment.
52 #pragma const_seg(pop)
54 #else // _WIN64
56 // "Fix" the segment. On x86, the .CRT segment is merged into the .data segment
57 // so it contains non-const data only.
58 #pragma data_seg(push, ".CRT$XIB")
59 // Declare the pointer so the CRT will find it.
60 DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init;
61 // Fix back the segment.
62 #pragma data_seg(pop)
64 #endif // _WIN64
65 #endif // defined(OS_WIN)
67 #endif // BASE_DEBUG_ON_START_H_
