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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
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      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/css/resolver/StyleResolverStats.h"
     33 
     34 #include "wtf/text/CString.h"
     35 #include "wtf/text/StringBuilder.h"
     36 
     37 #define PERCENT(x, y) ((!y) ? 0 : (((x) * 100.0) / (y)))
     38 
     39 namespace blink {
     40 
     41 void StyleResolverStats::reset()
     42 {
     43     sharedStyleLookups = 0;
     44     sharedStyleCandidates = 0;
     45     sharedStyleFound = 0;
     46     sharedStyleMissed = 0;
     47     sharedStyleRejectedByUncommonAttributeRules = 0;
     48     sharedStyleRejectedBySiblingRules = 0;
     49     sharedStyleRejectedByParent = 0;
     50     matchedPropertyApply = 0;
     51     matchedPropertyCacheHit = 0;
     52     matchedPropertyCacheInheritedHit = 0;
     53     matchedPropertyCacheAdded = 0;
     54 }
     55 
     56 String StyleResolverStats::report() const
     57 {
     58     StringBuilder output;
     59 
     60     unsigned sharedStylesRejected = sharedStyleRejectedByUncommonAttributeRules + sharedStyleRejectedBySiblingRules + sharedStyleRejectedByParent;
     61     unsigned sharedStylesUsed = sharedStyleFound - sharedStylesRejected;
     62 
     63     output.appendLiteral("Style sharing:\n");
     64     output.append(String::format("  %u elements were added to the sharing candidate list.\n", sharedStyleCandidates));
     65     output.append(String::format("  %u calls were made to findSharedStyle, %u found a candidate to share with (%.2f%%).\n", sharedStyleLookups, sharedStyleFound, PERCENT(sharedStyleFound, sharedStyleLookups)));
     66     if (printMissedCandidateCount)
     67         output.append(String::format("  %u candidates could have matched but were not in the list when searching (%.2f%%).\n", sharedStyleMissed, PERCENT(sharedStyleMissed, sharedStyleLookups)));
     68     output.append(String::format("  %u of found styles were rejected (%.2f%%), %.2f%% by uncommon attribute rules, %.2f%% by sibling rules and %.2f%% by parents disabling sharing.\n",
     69         sharedStylesRejected,
     70         PERCENT(sharedStylesRejected, sharedStyleFound),
     71         PERCENT(sharedStyleRejectedByUncommonAttributeRules, sharedStylesRejected),
     72         PERCENT(sharedStyleRejectedBySiblingRules, sharedStylesRejected),
     73         PERCENT(sharedStyleRejectedByParent, sharedStylesRejected)));
     74     output.append(String::format("  %u of found styles were used for sharing (%.2f%%).\n", sharedStylesUsed, PERCENT(sharedStylesUsed, sharedStyleFound)));
     75     output.append(String::format("  %.2f%% of calls to findSharedStyle returned a shared style.\n", PERCENT(sharedStylesUsed, sharedStyleLookups)));
     76 
     77     output.append('\n');
     78 
     79     output.appendLiteral("Matched property cache:\n");
     80     output.append(String::format("  %u calls to applyMatchedProperties, %u hit the cache (%.2f%%).\n", matchedPropertyApply, matchedPropertyCacheHit, PERCENT(matchedPropertyCacheHit, matchedPropertyApply)));
     81     output.append(String::format("  %u cache hits also shared the inherited style (%.2f%%).\n", matchedPropertyCacheInheritedHit, PERCENT(matchedPropertyCacheInheritedHit, matchedPropertyCacheHit)));
     82     output.append(String::format("  %u styles created in applyMatchedProperties were added to the cache (%.2f%%).\n", matchedPropertyCacheAdded, PERCENT(matchedPropertyCacheAdded, matchedPropertyApply)));
     83 
     84     return output.toString();
     85 }
     86 
     87 } // namespace blink
     88