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comparison: ipc/chromium/src/base/debug_on_start.h
ipc/chromium/src/base/debug_on_start.h
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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 | |
| 12 #include "base/basictypes.h" | |
| 13 | |
| 14 // This only works on MSVC. | |
| 15 #if defined(COMPILER_MSVC) | |
| 16 | |
| 17 #ifndef DECLSPEC_SELECTANY | |
| 18 #define DECLSPEC_SELECTANY __declspec(selectany) | |
| 19 #endif | |
| 20 | |
| 21 // Debug on start functions and data. | |
| 22 class DebugOnStart { | |
| 23 public: | |
| 24 // Expected function type in the .CRT$XI* section. | |
| 25 // Note: See VC\crt\src\internal.h for reference. | |
| 26 typedef int (__cdecl *PIFV)(void); | |
| 27 | |
| 28 // Looks at the command line for kDebugOnStart argument. If found, it invokes | |
| 29 // the debugger, if this fails, it crashes. | |
| 30 static int __cdecl Init(); | |
| 31 | |
| 32 // Returns true if the 'argument' is present in the 'command_line'. It does | |
| 33 // not use the CRT, only Kernel32 functions. | |
| 34 static bool FindArgument(wchar_t* command_line, const wchar_t* argument); | |
| 35 }; | |
| 36 | |
| 37 // Set the function pointer to our function to look for a crash on start. The | |
| 38 // XIB section is started pretty early in the program initialization so in | |
| 39 // theory it should be called before any user created global variable | |
| 40 // initialization code and CRT initialization code. | |
| 41 // Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference. | |
| 42 #ifdef _WIN64 | |
| 43 | |
| 44 // "Fix" the segment. On x64, the .CRT segment is merged into the .rdata segment | |
| 45 // so it contains const data only. | |
| 46 #pragma const_seg(push, ".CRT$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) | |
| 53 | |
| 54 #else // _WIN64 | |
| 55 | |
| 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) | |
| 63 | |
| 64 #endif // _WIN64 | |
| 65 #endif // defined(OS_WIN) | |
| 66 | |
| 67 #endif // BASE_DEBUG_ON_START_H_ |
