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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      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
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     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
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     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 #ifndef StyleResolverStats_h
     32 #define StyleResolverStats_h
     33 
     34 #include "wtf/PassOwnPtr.h"
     35 #include "wtf/text/WTFString.h"
     36 
     37 namespace blink {
     38 
     39 class StyleResolverStats {
     40 public:
     41     static PassOwnPtr<StyleResolverStats> create()
     42     {
     43         return adoptPtr(new StyleResolverStats);
     44     }
     45 
     46     void reset();
     47     String report() const;
     48 
     49     unsigned sharedStyleLookups;
     50     unsigned sharedStyleCandidates;
     51     unsigned sharedStyleFound;
     52     unsigned sharedStyleMissed;
     53     unsigned sharedStyleRejectedByUncommonAttributeRules;
     54     unsigned sharedStyleRejectedBySiblingRules;
     55     unsigned sharedStyleRejectedByParent;
     56     unsigned matchedPropertyApply;
     57     unsigned matchedPropertyCacheHit;
     58     unsigned matchedPropertyCacheInheritedHit;
     59     unsigned matchedPropertyCacheAdded;
     60 
     61     // We keep a separate flag for this since crawling the entire document to print
     62     // the number of missed candidates is very slow.
     63     bool printMissedCandidateCount;
     64 
     65 private:
     66     StyleResolverStats()
     67         : printMissedCandidateCount(false)
     68     {
     69         reset();
     70     }
     71 };
     72 
     73 #define INCREMENT_STYLE_STATS_COUNTER(resolver, counter) ((resolver).stats() && ++(resolver).stats()-> counter && (resolver).statsTotals()-> counter ++);
     74 
     75 } // namespace blink
     76 
     77 #endif // StyleResolverStats_h
     78