src/crashlog.h

   1 /* $Id: crashlog.h 24900 2013-01-08 22:46:42Z planetmaker $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file crashlog.h Functions to be called to log a crash */
  11
  12 #ifndef CRASHLOG_H
  13 #define CRASHLOG_H
  14
  15 /**
  16  * Helper class for creating crash logs.
  17  */
  18 class CrashLog {
  19 private:
  20         /** Pointer to the error message. */
  21         static const char *message;
  22
  23         /** Temporary 'local' location of the buffer. */
  24         static char *gamelog_buffer;
  25
  26         /** Temporary 'local' location of the end of the buffer. */
  27         static const char *gamelog_last;
  28
  29         static void GamelogFillCrashLog(const char *s);
  30 protected:
  31         /**
  32          * Writes OS' version to the buffer.
  33          * @param buffer The begin where to write at.
  34          * @param last   The last position in the buffer to write to.
  35          * @return the position of the \c '\0' character after the buffer.
  36          */
  37         virtual char *LogOSVersion(char *buffer, const char *last) const = 0;
  38
  39         /**
  40          * Writes compiler (and its version, if available) to the buffer.
  41          * @param buffer The begin where to write at.
  42          * @param last   The last position in the buffer to write to.
  43          * @return the position of the \c '\0' character after the buffer.
  44          */
  45         virtual char *LogCompiler(char *buffer, const char *last) const;
  46
  47         /**
  48          * Writes actually encountered error to the buffer.
  49          * @param buffer  The begin where to write at.
  50          * @param last    The last position in the buffer to write to.
  51          * @param message Message passed to use for possible errors. Can be NULL.
  52          * @return the position of the \c '\0' character after the buffer.
  53          */
  54         virtual char *LogError(char *buffer, const char *last, const char *message) const = 0;
  55
  56         /**
  57          * Writes the stack trace to the buffer, if there is information about it
  58          * available.
  59          * @param buffer The begin where to write at.
  60          * @param last   The last position in the buffer to write to.
  61          * @return the position of the \c '\0' character after the buffer.
  62          */
  63         virtual char *LogStacktrace(char *buffer, const char *last) const = 0;
  64
  65         /**
  66          * Writes information about the data in the registers, if there is
  67          * information about it available.
  68          * @param buffer The begin where to write at.
  69          * @param last   The last position in the buffer to write to.
  70          * @return the position of the \c '\0' character after the buffer.
  71          */
  72         virtual char *LogRegisters(char *buffer, const char *last) const;
  73
  74         /**
  75          * Writes the dynamically linked libraries/modules to the buffer, if there
  76          * is information about it available.
  77          * @param buffer The begin where to write at.
  78          * @param last   The last position in the buffer to write to.
  79          * @return the position of the \c '\0' character after the buffer.
  80          */
  81         virtual char *LogModules(char *buffer, const char *last) const;
  82
  83
  84         char *LogOpenTTDVersion(char *buffer, const char *last) const;
  85         char *LogConfiguration(char *buffer, const char *last) const;
  86         char *LogLibraries(char *buffer, const char *last) const;
  87         char *LogGamelog(char *buffer, const char *last) const;
  88         char *LogCommandLog(char *buffer, const char *last) const;
  89
  90 public:
  91         /** Stub destructor to silence some compilers. */
  92         virtual ~CrashLog() {}
  93
  94         char *FillCrashLog(char *buffer, const char *last) const;
  95         bool WriteCrashLog(const char *buffer, char *filename, const char *filename_last) const;
  96
  97         /**
  98          * Write the (crash) dump to a file.
  99          * @note On success the filename will be filled with the full path of the
 100          *       crash dump file. Make sure filename is at least \c MAX_PATH big.
 101          * @param filename      Output for the filename of the written file.
 102          * @param filename_last The last position in the filename buffer.
 103          * @return if less than 0, error. If 0 no dump is made, otherwise the dump
 104          *         was successful (not all OSes support dumping files).
 105          */
 106         virtual int WriteCrashDump(char *filename, const char *filename_last) const;
 107         bool WriteSavegame(char *filename, const char *filename_last) const;
 108         bool WriteScreenshot(char *filename, const char *filename_last) const;
 109
 110         bool MakeCrashLog() const;
 111
 112         /**
 113          * Initialiser for crash logs; do the appropriate things so crashes are
 114          * handled by our crash handler instead of returning straight to the OS.
 115          * @note must be implemented by all implementers of CrashLog.
 116          */
 117         static void InitialiseCrashLog();
 118
 119         static void SetErrorMessage(const char *message);
 120         static void AfterCrashLogCleanup();
 121 };
 122
 123 #endif /* CRASHLOG_H */