Editing Using Valgrind and gdb in Scratchbox

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#REDIRECT [[Documentation/Maemo_5_Developer_Guide/Kernel_and_Debugging_Guide/Maemo_Debugging_Guide]]
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{{Midgard article}}
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= Hints for using valgrind tools in Maemo Scratchbox =
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== Running Valgrind and gdb ==
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The standard way to use Valgrind and gdb is the af-sb-init.sh script. af-sb-init.sh supports parameters for running the software we're interested in with tools:
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af-sb-init.sh start --valgrind=my_app
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af-sb-init.sh start --gdb=my_app
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Valgrind will store the results in /tmp/valgrind-my_app.log*. gdb will show its prompt on loading my_app.
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== Debugging applets ==
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To debug a panel applet:
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af-sb-init.sh start --valgrind=maemo_af_desktop
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You'll get the results in /tmp/valgrind-maemo_af_desktop.log*
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== Other Valgrind front ends ==
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To use other Valgrind front-ends, set the following environment variables:
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* VALGRINDCMD: the command you want to run inside valgrind.
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* VALGRIND: the valgrind command and parameters, including the front-end to use.
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For example, to run massif on maemo_af_desktop:
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<pre>
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export VALGRINDCMD=maemo_af_desktop
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export VALGRIND="valgrind --tool=massif --num-callers=50
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        --trace-children=yes --depth=5 --format=html -log-file=/tmp/massif
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        --alloc-fn=g_malloc --alloc-fn=g_malloc0 --alloc-fn=g_realloc
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        --alloc-fn=g_slice_alloc --alloc-fn=g_try_malloc
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        --alloc-fn=g_slice_alloc0"
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af-sb-init.sh start
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... do your stuff ...
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af-sb-init.sh stop
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</pre>
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Your massif reports will be generated in /tmp (logs) and $PWD (html and postscripts).
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== Debug packages ==
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When gdb uses "realpath" on libraries in Scratchbox, the path returned starts with "/targets//", which causes some issues. You can see the effect of this if you run Valgrind or gdb through strace. This causes problems when using debug packages.
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To use debug packages with Valgrind and gdb in Scratchbox, run this script:
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<pre>
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#!/bin/sh
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# symlinks for debug symfiles in sbox
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mkdir -p /usr/lib/debug/targets
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cd /usr/lib/debug/targets
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ln -sf /usr/lib/debug $(sh -c '. /targets/links/scratchbox.config;echo $SBOX_TARGET_NAME')
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</pre>
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== GSlice ==
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When using Valgrind, set the environment variable G_SLICE:
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export G_SLICE="always-malloc"
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Otherwise Valgrind will report bogus leaks (see [http://bugzilla.gnome.org/show_bug.cgi?id=444444 this bug] in Gnome Bugzilla for more information on Glib Gslice and Valgrind).
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== Analysing ARM core dumps ==
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The cross-gdb used by default when it is installed in Scratchbox cannot debug ARM (EABI) core dumps. You need a natively compiled gdb to do this. To avoid using the cross-compiled gdb if it is installed, run your command with this script:
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<pre>
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#!/bin/sh
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# use native gdb in Scratchbox
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SBOX_REDIRECT_IGNORE=/usr/bin/gdb /usr/bin/gdb $*
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</pre>
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To check which gdb you are running, run "gdb -v". If you see "--host=i686-pc-linux-gnu" when you are on ARM, then you are running cross-gdb.
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[[Category:Development]]
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[[Category:Wiki page of the day]]
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[[Category:Scratchbox]]

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