1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/debug_on_start.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,67 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +// Define the necessary code and global data to look for kDebugOnStart command
1.9 +// line argument. When the command line argument is detected, it invokes the
1.10 +// debugger, if no system-wide debugger is registered, a debug break is done.
1.11 +
1.12 +#ifndef BASE_DEBUG_ON_START_H_
1.13 +#define BASE_DEBUG_ON_START_H_
1.14 +
1.15 +#include "base/basictypes.h"
1.16 +
1.17 +// This only works on MSVC.
1.18 +#if defined(COMPILER_MSVC)
1.19 +
1.20 +#ifndef DECLSPEC_SELECTANY
1.21 +#define DECLSPEC_SELECTANY __declspec(selectany)
1.22 +#endif
1.23 +
1.24 +// Debug on start functions and data.
1.25 +class DebugOnStart {
1.26 + public:
1.27 + // Expected function type in the .CRT$XI* section.
1.28 + // Note: See VC\crt\src\internal.h for reference.
1.29 + typedef int (__cdecl *PIFV)(void);
1.30 +
1.31 + // Looks at the command line for kDebugOnStart argument. If found, it invokes
1.32 + // the debugger, if this fails, it crashes.
1.33 + static int __cdecl Init();
1.34 +
1.35 + // Returns true if the 'argument' is present in the 'command_line'. It does
1.36 + // not use the CRT, only Kernel32 functions.
1.37 + static bool FindArgument(wchar_t* command_line, const wchar_t* argument);
1.38 +};
1.39 +
1.40 +// Set the function pointer to our function to look for a crash on start. The
1.41 +// XIB section is started pretty early in the program initialization so in
1.42 +// theory it should be called before any user created global variable
1.43 +// initialization code and CRT initialization code.
1.44 +// Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference.
1.45 +#ifdef _WIN64
1.46 +
1.47 +// "Fix" the segment. On x64, the .CRT segment is merged into the .rdata segment
1.48 +// so it contains const data only.
1.49 +#pragma const_seg(push, ".CRT$XIB")
1.50 +// Declare the pointer so the CRT will find it.
1.51 +extern const DebugOnStart::PIFV debug_on_start;
1.52 +DECLSPEC_SELECTANY const DebugOnStart::PIFV debug_on_start =
1.53 + &DebugOnStart::Init;
1.54 +// Fix back the segment.
1.55 +#pragma const_seg(pop)
1.56 +
1.57 +#else // _WIN64
1.58 +
1.59 +// "Fix" the segment. On x86, the .CRT segment is merged into the .data segment
1.60 +// so it contains non-const data only.
1.61 +#pragma data_seg(push, ".CRT$XIB")
1.62 +// Declare the pointer so the CRT will find it.
1.63 +DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init;
1.64 +// Fix back the segment.
1.65 +#pragma data_seg(pop)
1.66 +
1.67 +#endif // _WIN64
1.68 +#endif // defined(OS_WIN)
1.69 +
1.70 +#endif // BASE_DEBUG_ON_START_H_
