contrib/logo-droplets.svg

perf: introduce safeattrsetter to replace direct attribute assignment

Referring not-existing attribute immediately causes failure, but
assigning a value to such attribute doesn't.

For example, perf.py has code paths below, which assign a value to
not-existing attribute. This causes incorrect performance measurement,
but these code paths are executed successfully.

  - "repo._tags = None" in perftags()
    recent Mercurial has tags cache information in repo._tagscache

  - "branchmap.write = lambda repo: None" in perfbranchmap()
    branchmap cache is written out by branchcache.write() in branchmap.py

"util.safehasattr() before assignment" can avoid this issue, but might
increase mistake at "copy & paste" attribute name or so.

To centralize (1) examining existence of, (2) assigning a value to,
and (3) restoring an old value to the attribute, this patch introduces
safeattrsetter(). This is used to replace direct attribute assignment
in subsequent patches.

Encapsulation of restoring is needed to completely remove direct
attribute assignment from perf.py, even though restoring isn't needed
so often.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg id="Layer_1" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" xml:space="preserve" height="120" width="100" version="1.0" xmlns:cc="http://web.resource.org/cc/" xmlns:dc="http://purl.org/dc/elements/1.1/" viewBox="0 0 124.766 152.099"><metadata id="metadata6845"><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title>Mercurial &quot;droplets&quot; logo</dc:title><dc:creator><cc:Agent><dc:title>Cali Mastny and Matt Mackall</dc:title></cc:Agent></dc:creator><cc:license rdf:resource="http://creativecommons.org/licenses/GPL/2.0/"/><dc:date>Feb 12 2008</dc:date></cc:Work><cc:License rdf:about="http://creativecommons.org/licenses/GPL/2.0/"><cc:permits rdf:resource="http://web.resource.org/cc/Reproduction"/><cc:permits rdf:resource="http://web.resource.org/cc/Distribution"/><cc:requires rdf:resource="http://web.resource.org/cc/Notice"/><cc:permits rdf:resource="http://web.resource.org/cc/DerivativeWorks"/><cc:requires rdf:resource="http://web.resource.org/cc/ShareAlike"/><cc:requires rdf:resource="http://web.resource.org/cc/SourceCode"/></cc:License></rdf:RDF></metadata>
<rect id="rect6847" stroke-linejoin="miter" style="stroke-dasharray:none;" height="150.12" width="124.77" stroke="#000" stroke-miterlimit="4" y="0.98776" x="0.3169" stroke-width="1.9755" fill="#FFF"/><path id="text2611" style="stroke-dasharray:none;" d="M9.848,124.61c1.777-0.79,3.665-1.18,5.479-1.18,1.74,0,2.851,0.43,3.48,1.32,1.332-0.89,3.146-1.32,4.553-1.32,4.221,0,4.369,1.71,4.369,6.73v11.11c0,0.49,0.074,0.49-2.036,0.49v-11.81c0-3.63-0.074-4.74-2.48-4.74-1.073,0-2.184,0.25-3.369,1.03v15.27c-0.037,0.15-0.111,0.18-0.369,0.22-0.038,0-0.074,0.03-0.112,0.03h-1.555v-11.81c0-3.49,0-4.77-2.517-4.77-1.074,0-2.147,0.21-3.406,0.82v15.27c0,0.49,0.074,0.49-2.0361,0.49v-17.15m27.831-1.18c-3.146,0-6.626,0.89-6.626,10.4,0,7.33,2.554,8.47,6.071,8.47,2.701,0,5.034-0.89,5.034-1.32,0-0.53-0.074-1.35-0.259-1.82-1.148,0.79-2.777,1.21-4.59,1.21-2.48,0-4.146-0.71-4.184-6.22,1.629,0,5.776-0.04,8.848-0.65,0.259-1.17,0.37-2.88,0.37-4.37,0-3.56-1.444-5.7-4.664-5.7m-0.185,1.78c2.221,0,2.813,1.46,2.85,4.31,0,0.75-0.037,1.64-0.148,2.49-2.073,0.5-5.591,0.5-7.072,0.5,0.261-6.48,2.481-7.3,4.37-7.3m8.07-0.21c1.739-1.14,3.332-1.57,4.961-1.57,1.814,0,2.666,0.5,2.666,1.11,0,0.35-0.112,0.96-0.297,1.31-0.519-0.28-1.11-0.53-2.074-0.53-1.184,0-2.295,0.32-3.183,1.1v14.85c0,0.49,0.037,0.49-2.073,0.49v-16.76m18.69-0.39c0-0.47-1.554-1.18-3.11-1.18-2.999,0-6.664,1.03-6.664,9.83,0,8.33,2.222,9.07,6.109,9.07,1.924,0,3.665-1.03,3.665-1.6,0-0.32-0.074-0.82-0.26-1.24-0.778,0.56-1.962,1.1-3.22,1.1-2.665,0-4.22-0.75-4.22-7.23,0-7.15,2.554-8.15,4.775-8.15,1.258,0,1.962,0.36,2.665,0.82,0.186-0.43,0.26-1.03,0.26-1.42m14.181,16.55c-1.63,0.82-3.776,1.14-5.627,1.14-4.739,0-5.442-1.99-5.442-6.73v-11.14c0-0.46-0.037-0.46,2.074-0.46v11.82c0,3.56,0.517,4.77,3.294,4.77,1.073,0,2.554-0.22,3.665-0.86v-15.27c0-0.46-0.074-0.46,2.036-0.46v17.19m4.221-16.16c1.739-1.14,3.332-1.57,4.96-1.57,1.814,0,2.666,0.5,2.666,1.11,0,0.35-0.111,0.96-0.296,1.31-0.519-0.28-1.111-0.53-2.074-0.53-1.184,0-2.295,0.32-3.183,1.1v14.85c0,0.49,0.037,0.49-2.073,0.49v-16.76m12.379-1.03c-1.629,0-2.11,0-2.11,0.96v16.83c2.073,0,2.11,0,2.11-0.49v-17.3m-2.184-6.27c0,1.18,0.37,1.6,1.11,1.64,0.851,0,1.259-0.61,1.259-1.67,0.037-1.11-0.26-1.61-1.111-1.61-0.814,0-1.221,0.61-1.258,1.64m5.696,7.3c0-0.39,0.074-0.61,0.222-0.71,0.704-0.39,3.41-0.86,6.48-0.86,2.33,0,3.81,1.11,3.81,4.31v2.31c0,6.34-0.18,11.07-0.18,11.07-0.85,0.47-2.45,1.18-5.04,1.18-2.66,0.03-5.329-0.22-5.329-5.48,0-5.02,2.739-5.81,5.479-5.81,1.04,0,2.26,0.11,3.07,0.43v-3.31c0-2.31-1.18-2.81-2.59-2.81-1.89,0-4.514,0.35-5.662,0.89-0.222-0.39-0.26-1-0.26-1.21m8.512,7.9c-0.7-0.25-1.7-0.35-2.4-0.35-2.11,0-4.04,0.42-4.04,4.34,0,3.66,1.59,3.7,3.48,3.7,1.19,0,2.37-0.32,2.78-0.75,0,0,0.18-4.27,0.18-6.94m7.86,8.37c0,0.49,0.04,0.49-2.04,0.49v-25.2c0-0.96,0.41-0.96,2.04-0.96v25.67" stroke-miterlimit="4" stroke-width="2.02999997" fill="#010101"/><g id="g4503" transform="matrix(0.9351326,0,0,0.9351326,150.39508,-1.251766)"><path id="path2339" fill="#1b1a1b" d="M-45.75,92.692c20.04-33.321-4.232-87.363-48.614-81.873-40.096,4.958-40.746,47.165-5.405,57.191,30.583,8.685,6.318,28.084,7.027,41,0.712,12.92,26.587,17.6,46.992-16.318z"/><circle id="circle2341" transform="matrix(1.0917947,-0.2858168,0.2858168,1.0917947,-180.30817,13.494135)" cy="85.364" cx="33.728" r="15.414" fill="#1b1a1b"/><path id="path2343" fill="#1b1a1b" d="M-140.06,48.936c-6.26,0.606-10.84,6.164-10.24,12.422,0.61,6.262,6.17,10.847,12.43,10.241,6.26-0.614,10.84-6.171,10.23-12.43-0.61-6.253-6.16-10.839-12.42-10.233z"/><path id="path2561" fill="#bfbfbf" d="M-44.993,91.34c20.041-33.321-4.231-87.363-48.613-81.873-40.104,4.9568-40.744,47.166-5.406,57.193,30.583,8.684,6.318,28.083,7.027,41,0.713,12.92,26.587,17.6,46.992-16.32z"/><path id="path2563" fill="#000" d="M-86.842,112.76c-1.215-1.97,0.642-4.16,2.551-3.99,3.039,0.26,9.655-0.04,14.876-3,13.043-7.39,33.114-42.966,23.019-65.405-4.519-10.044-6.72-12.92-11.374-17.833-0.95-1.002-0.405-0.948,0.238-0.609,2.517,1.321,6.94,6.437,11.477,14.765,7.664,14.069,7.267,30.795,4.416,41.287-1.986,7.299-8.825,23.815-18.842,30.955-10.039,7.15-21.785,11.26-26.361,3.83z"/><path id="path2565" fill="#000" d="M-95.93,66.591c-6.83-2.028-15.64-4.853-20.74-11.517-3.75-4.914-5.66-10.277-6.15-13.318-0.17-1.085-0.32-1.991-0.01-2.24,0.15-0.117,2.81,5.896,6.79,10.936,3.97,5.04,9.53,7.988,14.16,9.059,4.117,0.952,12.646,3.044,15.532,5.503,2.967,2.527,3.215,7.987,2.216,8.603-1.006,0.62-3.048-4.429-11.798-7.026z"/><path id="path2567" fill="#FFF" d="M-81.841,113.72c-0.132,1.57,1.665,1.87,4.083,1.51,3.099-0.46,5.72-0.81,9.287-2.6,4.835-2.42,9.728-5.89,13.312-10.57,10.692-13.945,14.478-30.45,13.895-32.824-0.195,1.961-2.776,12.253-8.679,21.532-7.582,11.922-13.079,18.262-25.758,21.342-3.529,0.86-5.967-0.45-6.14,1.61z"/><path id="path2569" fill="#FFF" d="M-109.96,59.479c1.44,1.225,4.4,2.857,10.223,4.767,7.031,2.305,10.455,4.304,11.888,5.262,1.52,1.018,2.483,3.288,2.578,1.272,0.099-2.019-1.145-3.755-3.921-4.675-1.878-0.624-5.038-2.109-8.067-2.707-1.946-0.384-5.111-1.146-7.831-1.978-1.48-0.457-3-1.258-4.87-1.941z"/><circle id="circle2577" transform="matrix(1.0917947,-0.2858168,0.2858168,1.0917947,-180.30817,13.494135)" cy="84.375" cx="34.681" r="15.414" fill="#bfbfbf"/><path id="path2579" fill="#000" d="M-128.68,108.38c13.53,12.54,33.894-4.69,24.93-19.897-1.01-1.708-2.32-3.009-1.89-1.7,2.87,8.747,0.22,15.667-4.72,19.227-4.85,3.5-11.51,4.09-16.84,1.32-1.57-0.81-2.22,0.37-1.48,1.05z"/><path id="path2585" fill="#FFF" d="M-118.07,110.95c1.73-0.36,11.75-2.95,14.1-11.194,0.73-2.569,0.86-2.053,0.66-0.661-1.06,7.105-7.78,12.345-13.49,12.545-1.16,0.12-2.68-0.39-1.27-0.69z"/><path id="path2589" fill="#bfbfbf" d="M-139.3,47.584c-6.26,0.605-10.84,6.164-10.24,12.422,0.61,6.261,6.17,10.847,12.43,10.241,6.25-0.614,10.84-6.173,10.23-12.431-0.61-6.254-6.17-10.838-12.42-10.232z"/><path id="path2591" fill="#000" d="M-144.47,67.571c0.07,0.805,1.17,1.838,2.9,2.312,1.49,0.408,5.32,1.45,10.25-1.658,4.92-3.108,5.49-11.421,3.25-13.865-0.69-1.239-1.59-2.14-0.88-0.164,1.81,4.99-1.7,9.659-4.74,11.82-3.03,2.162-6.88,1.139-8.45,0.66s-2.4,0.064-2.33,0.895z"/><path id="path2597" fill="#FFF" d="M-138.11,68.688c0.45-0.406,2.73-0.24,4.79-1.35,2.07-1.109,4.52-3.54,4.95-6.994,0.26-2.029,0.34-1.519,0.44-0.415-0.32,5.743-5.6,8.916-8.62,9.334-0.82,0.113-2.25,0.044-1.56-0.575z"/><path id="path2561_1_" fill="#999" d="M-47.767,69.694c8.532-24.594-9.323-61.736-45.446-57.268-32.637,4.035-33.167,38.389-4.4,46.55,32.582,4.933,12.962,29.512,10.179,41.904-2.495,11.11,26.331,12.94,39.667-31.186z"/><path id="path2571" fill="#f3f3f3" d="M-70.093,88.904c-8.827-1.092-21.529,18.836-9.552,16.506,5.756-0.86,10.525-2.89,14.794-7.762,5.567-6.353,13.883-20.074,16.288-28.94,2.025-7.476,1.007-19.057-1.081-8.175-2.142,11.167-11.623,29.464-20.449,28.371z"/><path id="path2581" fill="#999" d="M-129.39,104.85c2.05,0.03,3.28,0.32,5.35,1.77,4.09,1.7,11.61,0.62,15.09-3.95,3.47-4.57,3.58-10.868,2.26-14.674-3.24-9.314-16.99-9.149-23.13-1.417-6.64,8.636-1.61,18.231,0.43,18.271z"/><path id="path2593_2_" fill="#999" d="M-147.64,61.684c0.41,1.282,1.45,3.154,3.65,3.466,2.94,0.417,3.54,1.743,7,1.055,3.47-0.688,6.09-3.528,7.14-6.67,1.21-4.347-0.59-6.591-3.31-8.595-2.71-2.003-8.67-1.788-12.23,1.458-2.53,2.305-3.24,6.163-2.25,9.286z"/><path id="path256" fill="#f3f3f3" d="M-136.11,64.558c2.66-0.697,6.18-4.325,4.44-7.096-2.16-3.413-8.17-0.491-8.37,3.309-0.21,3.802,1.11,4.526,3.93,3.787z"/><path id="path258" fill="#f3f3f3" d="M-116.12,105.51c2.28-0.6,9.24-3.43,7.93-13.547-0.66-5.126-3.46,6.361-8.63,8.077-7.85,2.61-6.97,7.48,0.7,5.47z"/></g>
</svg>