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#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 39namespace blink { 40 41void 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 56String 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