![]() If the bug is suspected to be caused by memory management issues i.e. If you want to use gdb for setting breakpoints, examining variables, then the graphical wrapper for gdb, called the GNU Data Display Debugger makes this easier. Unless -enable-release is passed to configure, ScummVM will be compiled with debug symbols and the backtrace should be readable with annotations of ScummVM function names and line numbers. The most useful command is bt which prints a backtrace of the point of the crash, showing the function call stack state. This then allows commands to be entered to query the state at the Like most debuggers, if a crash (segfault) occurs, then control is returned to the debugger i.e. When debugging on Unix, the main tool is the GNU debugger. With the appropriate cable to convert the 3V3 serial port to RS232 serial and a terminal program set to 57600 baud 8-N-1, you can view the debug outputįrom libronin, including the sbrk indication of remaining memory, which can be useful in diagnosing Out Of Memory crashes. The debug builds with serial enabled from here provide debug output to the Dreamcast serial port. This requires no Host PC, USB connection or software setup beyond installing this app and can be downloaded from the Android Store (Google Play) for no cost. If you are using Android 4.1 or below (Android 4.2 requires root access to view logs), there is an easier to use log viewer application which runs on the device called "alogcat": This should record any ScummVM related errors, warnings or other information, especially related to failures of the application to start or application crashes.įor investigating user bug reports, it would useful to get this information, but the ADB requires a USB connection to a host PC with the ADK. Specifically, the logcat command will display the log: When debugging on Android, the Android Debug Bridge provides developers with access to the system log. The following hints are provided for how to do low level debugging on various platforms. If the observed bug only occurs on certain platforms or is unstable to reproduce, it is likely that the engine debugging output will not be sufficient, even with the possibility of adding further It also generally requires a debug build (either compiled yourself or a nightly build from here) as release builds are generally stripped of debugging symbols Unlike the previous engine specific debugging output which is present in all builds including releases, debugging the platform backend code requires procedure and tools specific to the platform. TODO: Document debug flags/levels for the various ports. TODO: Document commands for specific engines, or link to subpages in each engine for this. This can be extended with further engine-specific commands. debugflag_disable : disable a given debugflag.debugflag_enable : enable a given debugflag.debugflag_list : list the available debug flags and their status.help : Display the list of available commands.The default console provides the following default commands : (though users can change this by altering it's entry in the ScummVM Options Keymapper tab). The key combination to activate the debug console is CTRL-Alt-d This is especially useful on embedded ports which usually lack the stdout console used currently for debug output as described above. ScummVM engines should implement an interactive debug console. Into clearly named groupings and can be changed during runtime using the debug console. They are generally preferred to just using debuglevel, since they allow separation of debug output These can be set by passing the command line parameter, -debugflags= to scummvm at runtime. This is set by passing the command line parameter, -d to scummvm at runtime.ĭebugflags (also known as Debug Channels) are booleans and are engine specific. This parameter indicates increasing verbosity of debug output, but does not separate by function. The debuglevel is a global single integer which varies between -1 (minimum - default) and 11 (maximum). The functions in common/debug.* provide a basic debug output interface in a platform portable form. 3.3 Unix (Linux, Solaris, Mac OS X, MinGW.
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