84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// Define the necessary code and global data to look for kDebugOnStart command
|
|
// line argument. When the command line argument is detected, it invokes the
|
|
// debugger, if no system-wide debugger is registered, a debug break is done.
|
|
|
|
#ifndef BASE_DEBUG_DEBUG_ON_START_WIN_H_
|
|
#define BASE_DEBUG_DEBUG_ON_START_WIN_H_
|
|
|
|
#include "base/basictypes.h"
|
|
#include "build/build_config.h"
|
|
|
|
// This only works on Windows. It's legal to include on other platforms, but
|
|
// will be a NOP.
|
|
#if defined(OS_WIN)
|
|
|
|
#ifndef DECLSPEC_SELECTANY
|
|
#define DECLSPEC_SELECTANY __declspec(selectany)
|
|
#endif
|
|
|
|
namespace base {
|
|
namespace debug {
|
|
|
|
// There is no way for this code, as currently implemented, to work across DLLs.
|
|
// TODO(rvargas): It looks like we really don't use this code, at least not for
|
|
// Chrome. Figure out if it's really worth implementing something simpler.
|
|
#if !defined(COMPONENT_BUILD)
|
|
|
|
// Debug on start functions and data.
|
|
class DebugOnStart {
|
|
public:
|
|
// Expected function type in the .CRT$XI* section.
|
|
// Note: See VC\crt\src\internal.h for reference.
|
|
typedef int (__cdecl *PIFV)(void);
|
|
|
|
// Looks at the command line for kDebugOnStart argument. If found, it invokes
|
|
// the debugger, if this fails, it crashes.
|
|
static int __cdecl Init();
|
|
|
|
// Returns true if the 'argument' is present in the 'command_line'. It does
|
|
// not use the CRT, only Kernel32 functions.
|
|
static bool FindArgument(wchar_t* command_line, const char* argument);
|
|
};
|
|
|
|
// Set the function pointer to our function to look for a crash on start. The
|
|
// XIB section is started pretty early in the program initialization so in
|
|
// theory it should be called before any user created global variable
|
|
// initialization code and CRT initialization code.
|
|
// Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference.
|
|
#ifdef _WIN64
|
|
|
|
// "Fix" the segment. On x64, the .CRT segment is merged into the .rdata segment
|
|
// so it contains const data only.
|
|
#pragma const_seg(push, ".CRT$XIB")
|
|
// Declare the pointer so the CRT will find it.
|
|
extern const DebugOnStart::PIFV debug_on_start;
|
|
DECLSPEC_SELECTANY const DebugOnStart::PIFV debug_on_start =
|
|
&DebugOnStart::Init;
|
|
// Fix back the segment.
|
|
#pragma const_seg(pop)
|
|
|
|
#else // _WIN64
|
|
|
|
// "Fix" the segment. On x86, the .CRT segment is merged into the .data segment
|
|
// so it contains non-const data only.
|
|
#pragma data_seg(push, ".CRT$XIB")
|
|
// Declare the pointer so the CRT will find it.
|
|
DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init;
|
|
// Fix back the segment.
|
|
#pragma data_seg(pop)
|
|
|
|
#endif // _WIN64
|
|
|
|
#endif // defined(COMPONENT_BUILD)
|
|
|
|
} // namespace debug
|
|
} // namespace base
|
|
|
|
#endif // defined(OS_WIN)
|
|
|
|
#endif // BASE_DEBUG_DEBUG_ON_START_WIN_H_
|