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Debugging Octave: Difference between revisions
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Octave will start up. To load the symbol table the function needs to be executed, for example by invoking the help function | Octave will start up. To load the symbol table the function needs to be executed, for example by invoking the help function | ||
<syntaxhighlight lang=" | <syntaxhighlight lang="octave"> | ||
octave:1> help file | octave:1> help file | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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by typing c the execution of octave will continue and you can run your oct-file directly or via an m-script. | by typing c the execution of octave will continue and you can run your oct-file directly or via an m-script. | ||
<syntaxhighlight lang=" | <syntaxhighlight lang="octave"> | ||
octave:1> x = file(y) | octave:1> x = file(y) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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# Catch loading of your oct-file ("file" below is a regex matching name of your oct-file)<br/><syntaxhighlight lang="bash">(gdb) catch load file</syntaxhighlight> | # Catch loading of your oct-file ("file" below is a regex matching name of your oct-file)<br/><syntaxhighlight lang="bash">(gdb) catch load file</syntaxhighlight> | ||
# Run octave<br/><syntaxhighlight lang="bash">(gdb) r</syntaxhighlight> | # Run octave<br/><syntaxhighlight lang="bash">(gdb) r</syntaxhighlight> | ||
# From octave request loading of your oct-file by calling function<br/><syntaxhighlight lang=" | # From octave request loading of your oct-file by calling function<br/><syntaxhighlight lang="octave">octave> x = file(y)</syntaxhighlight> | ||
# Control will switch to gdb just after oct-file is loaded and at this point all symbols from oct-file are available so you can either set up a breakpoint at particular line or at function entry.<br/><syntaxhighlight lang="bash">(gdb) b file.cpp:40</syntaxhighlight> | # Control will switch to gdb just after oct-file is loaded and at this point all symbols from oct-file are available so you can either set up a breakpoint at particular line or at function entry.<br/><syntaxhighlight lang="bash">(gdb) b file.cpp:40</syntaxhighlight> | ||
# Resume execution of octave by<br/><syntaxhighlight lang="bash">(gdb) c</syntaxhighlight> | # Resume execution of octave by<br/><syntaxhighlight lang="bash">(gdb) c</syntaxhighlight> | ||
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cd /octave/build/tree | cd /octave/build/tree | ||
./run-octave -g | ./run-octave -g | ||
== Producing a stack trace == | |||
Sometimes Octave will crash, meaning, it terminates abruptly and returns control to the operating system shell. In these cases, it is very helpful to produce a stack trace to reproduce the problem. To do so, you need to (re)compile Octave with debugging symbols as explained above and run the debugger, as explained above. Then, run Octave: | |||
<syntaxhighlight lang="bash"> | |||
gdb> run | |||
</syntaxhighlight> | |||
execute whatever commands you think are necessary to produce the crash. When Octave crashes, you will be back in a gdb session. Type <code>bt</code> here to obtain a stack trace. | |||
=== Most used commands === | === Most used commands === | ||