Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 75 insertions, 0 deletions

diff --git a/base/debug_on_start.h b/base/debug_on_start.h
new file mode 100644
index 0000000..87afe9b
--- /dev/null
+++ b/base/debug_on_start.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// 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_ON_START_H__
+#define BASE_DEBUG_ON_START_H__
+
+// This only works on Windows.
+#ifdef _WIN32
+
+#ifndef DECLSPEC_SELECTANY
+#define DECLSPEC_SELECTANY  __declspec(selectany)
+#endif
+
+// Debug on start functions and data.
+class DebugOnStart {
+ public:
+  // Expected function type in the .CRT$XI* section.
+  // Note: See VC\crt\src\internal.h for reference.
+  typedef int  (__cdecl *PIFV)(void);
+
+  // Looks at the command line for kDebugOnStart argument. If found, it invokes
+  // the debugger, if this fails, it crashes.
+  static int __cdecl Init();
+
+  // Returns true if the 'argument' is present in the 'command_line'. It does
+  // not use the CRT, only Kernel32 functions.
+  static bool FindArgument(wchar_t* command_line, const wchar_t* argument);
+};
+
+// Set the function pointer to our function to look for a crash on start. The
+// XIB section is started pretty early in the program initialization so in
+// theory it should be called before any user created global variable
+// initialization code and CRT initialization code.
+// Note: See VC\crt\src\defsects.inc and VC\crt\src\crt0.c for reference.
+
+// "Fix" the data section.
+#pragma data_seg(push, ".CRT$XIB")
+// Declare the pointer so the CRT will find it.
+DECLSPEC_SELECTANY DebugOnStart::PIFV debug_on_start = &DebugOnStart::Init;
+// Fix back the data segment.
+#pragma data_seg(pop)
+
+#endif  // _WIN32
+
+#endif  // BASE_DEBUG_ON_START_H__