exception_handler.h

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// Copyright (c) 2006, 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.

// ExceptionHandler can write a minidump file when an exception occurs,
// or when WriteMinidump() is called explicitly by your program.
//
// To have the exception handler write minidumps when an uncaught exception
// (crash) occurs, you should create an instance early in the execution
// of your program, and keep it around for the entire time you want to
// have crash handling active (typically, until shutdown).
//
// If you want to write minidumps without installing the exception handler,
// you can create an ExceptionHandler with install_handler set to false,
// then call WriteMinidump.  You can also use this technique if you want to
// use different minidump callbacks for different call sites.
//
// In either case, a callback function is called when a minidump is written,
// which receives the unqiue id of the minidump.  The caller can use this
// id to collect and write additional application state, and to launch an
// external crash-reporting application.
//
// It is important that creation and destruction of ExceptionHandler objects
// be nested cleanly, when using install_handler = true.
// Avoid the following pattern:
//   ExceptionHandler *e = new ExceptionHandler(...);
//   ExceptionHandler *f = new ExceptionHandler(...);
//   delete e;
// This will put the exception filter stack into an inconsistent state.
//
// To use this library in your project, you will need to link against
// ole32.lib.

#ifndef CLIENT_WINDOWS_HANDLER_EXCEPTION_HANDLER_H__
#define CLIENT_WINDOWS_HANDLER_EXCEPTION_HANDLER_H__

#include <stdlib.h>
#include <Windows.h>
#include <DbgHelp.h>

#pragma warning( push )
// Disable exception handler warnings.
#pragma warning( disable : 4530 ) 

#include <string>
#include <vector>

#include "google_breakpad/common/minidump_format.h"

namespace google_breakpad {

using std::vector;
using std::wstring;

class ExceptionHandler {
 public:
  // A callback function to run before Breakpad performs any substantial
  // processing of an exception.  A FilterCallback is called before writing
  // a minidump.  context is the parameter supplied by the user as
  // callback_context when the handler was created.  exinfo points to the
  // exception record, if any; assertion points to assertion information,
  // if any.
  //
  // If a FilterCallback returns true, Breakpad will continue processing,
  // attempting to write a minidump.  If a FilterCallback returns false, Breakpad
  // will immediately report the exception as unhandled without writing a
  // minidump, allowing another handler the opportunity to handle it.
  typedef bool (*FilterCallback)(void *context, EXCEPTION_POINTERS *exinfo,
                                 MDRawAssertionInfo *assertion);

  // A callback function to run after the minidump has been written.
  // minidump_id is a unique id for the dump, so the minidump
  // file is <dump_path>\<minidump_id>.dmp.  context is the parameter supplied
  // by the user as callback_context when the handler was created.  exinfo
  // points to the exception record, or NULL if no exception occurred.
  // succeeded indicates whether a minidump file was successfully written.
  // assertion points to information about an assertion if the handler was
  // invoked by an assertion.
  //
  // If an exception occurred and the callback returns true, Breakpad will treat
  // the exception as fully-handled, suppressing any other handlers from being
  // notified of the exception.  If the callback returns false, Breakpad will
  // treat the exception as unhandled, and allow another handler to handle it.
  // If there are no other handlers, Breakpad will report the exception to the
  // system as unhandled, allowing a debugger or native crash dialog the
  // opportunity to handle the exception.  Most callback implementations
  // should normally return the value of |succeeded|, or when they wish to
  // not report an exception of handled, false.  Callbacks will rarely want to
  // return true directly (unless |succeeded| is true).
  typedef bool (*MinidumpCallback)(const wchar_t *dump_path,
                                   const wchar_t *minidump_id,
                                   void *context,
                                   EXCEPTION_POINTERS *exinfo,
                                   MDRawAssertionInfo *assertion,
                                   bool succeeded);

  // HandlerType specifies which types of handlers should be installed, if
  // any.  Use HANDLER_NONE for an ExceptionHandler that remains idle,
  // without catching any failures on its own.  This type of handler may
  // still be triggered by calling WriteMinidump.  Otherwise, use a
  // combination of the other HANDLER_ values, or HANDLER_ALL to install
  // all handlers.
  enum HandlerType {
    HANDLER_NONE = 0,
    HANDLER_EXCEPTION = 1 << 0,          // SetUnhandledExceptionFilter
    HANDLER_INVALID_PARAMETER = 1 << 1,  // _set_invalid_parameter_handler
    HANDLER_PURECALL = 1 << 2,           // _set_purecall_handler
    HANDLER_ALL = HANDLER_EXCEPTION |
                  HANDLER_INVALID_PARAMETER |
                  HANDLER_PURECALL
  };

  // Creates a new ExceptionHandler instance to handle writing minidumps.
  // Before writing a minidump, the optional filter callback will be called.
  // Its return value determines whether or not Breakpad should write a
  // minidump.  Minidump files will be written to dump_path, and the optional
  // callback is called after writing the dump file, as described above.
  // handler_types specifies the types of handlers that should be installed.
  ExceptionHandler(const wstring &dump_path,
                   FilterCallback filter,
                   MinidumpCallback callback,
                   void *callback_context,
                   int handler_types);
  ~ExceptionHandler();

  // Get and set the minidump path.
  wstring dump_path() const { return dump_path_; }
  void set_dump_path(const wstring &dump_path) {
    dump_path_ = dump_path;
    dump_path_c_ = dump_path_.c_str();
    UpdateNextID();  // Necessary to put dump_path_ in next_minidump_path_.
  }

  // Writes a minidump immediately.  This can be used to capture the
  // execution state independently of a crash.  Returns true on success.
  bool WriteMinidump();

  // Writes a minidump immediately, with the user-supplied exception
  // information.
  bool WriteMinidumpForException(EXCEPTION_POINTERS *exinfo);

  // Convenience form of WriteMinidump which does not require an
  // ExceptionHandler instance.
  static bool WriteMinidump(const wstring &dump_path,
                            MinidumpCallback callback, void *callback_context);

 private:
  friend class AutoExceptionHandler;

  // Function pointer type for MiniDumpWriteDump, which is looked up