Excellent :) There's obviously no nice run-time solution using the C++ API, though I guess callgrind/linux-perf can do it - do you have any experience worth sharing there?
Rob. On Mon, Sep 1, 2014 at 7:14 AM, Even Rouault <[email protected]> wrote: > Le dimanche 31 août 2014 20:50:41, Robert Coup a écrit : > > That's cool :) Is there any particular performance penalty to compiling > > *with* OGRAPISPY_ENABLED and then running *without* > > OGR_API_SPY_FILE/OGR_API_SPY_SNAPSHOT_PATH > > set? > > Hi Robert, > > Hopefully no, see for example : > > OGRFeatureH OGR_L_GetNextFeature( OGRLayerH hLayer ) > > { > VALIDATE_POINTER1( hLayer, "OGR_L_GetNextFeature", NULL ); > > #ifdef OGRAPISPY_ENABLED > if( bOGRAPISpyEnabled ) > OGRAPISpy_L_GetNextFeature(hLayer); > #endif > > return (OGRFeatureH) ((OGRLayer *)hLayer)->GetNextFeature(); > } > > I cannot imagine something with less overhead. (if you exclude dynamic > binary > patching techniques ;-) ) > > OGROpen() and OGR_Dr_CreateDataSource() call a tracing function that tests > if > the env. variable is set, and if so set the boolean bOGRAPISpyEnabled. > > Even > > > > > Rob :) > > > > > > On Sun, Aug 31, 2014 at 11:34 PM, Even Rouault < > [email protected]> > > > > wrote: > > > Hi, > > > > > > This will not be of interest for the crowds, but mainly for OGR driver > > > developers (and potentially also to get precise bug reports from > users). > > > I'm > > > currently adding update capabilities to the MITAB driver, and while > > > playing with QGIS, there are sometimes sequences of OGR calls that > > > trigger bugs, but > > > that I had issues to replicate afterwards. This spy mechanism enables > to > > > have > > > recording of all relevant calls to be able to replicate them exactly > > > afterwards. > > > > > > Doc to use it : http://www.gdal.org/ograpispy_8h.html > > > > > > Related autotest script : > > > http://svn.osgeo.org/gdal/trunk/autotest/ogr/ograpispy.py > > > > > > Even > > > > > > -- > > > Spatialys - Geospatial professional services > > > http://www.spatialys.com > > > _______________________________________________ > > > gdal-dev mailing list > > > [email protected] > > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com > -- *Koordinates*PO Box 1604, Shortland St, Auckland 1140, New Zealand Phone +64-9-966 0433 koordinates.com <https://koordinates.com/about>
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