37978 2010-04-22 00:34:43 -0700 Unify JSC::IdentifierTable and WebCore::AtomicStringTable implementations. 2010-04-22 13:55:29 -0700 1 1 1 Unclassified WebKit Web Template Framework 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 barraclough barraclough abarth eric webkit.review.bot oldest_to_newest 215754 0 barraclough 2010-04-22 00:34:43 -0700 These two classes both implement a HashSet of uniqued StringImpls, with translator classes to avoid unnecessary object creation. The only difference between the classes is which flag (isIdentifier or inTable) is set. Combine the two classes using a template predicated on which flag to use. 215761 1 54036 barraclough 2010-04-22 00:42:19 -0700 Created attachment 54036 The patch 215762 2 webkit.review.bot 2010-04-22 00:44:47 -0700 Attachment 54036 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1 JavaScriptCore/wtf/text/AtomicStringTable.h:32: Alphabetical sorting problem. [build/include_order] [4] JavaScriptCore/wtf/text/AtomicStringTable.h:53: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] Total errors found: 2 in 16 files If any of these errors are false positives, please file a bug against check-webkit-style. 215765 3 54038 barraclough 2010-04-22 00:47:01 -0700 Created attachment 54038 Fix review bot issues 215932 4 54038 ggaren 2010-04-22 09:58:45 -0700 Comment on attachment 54038 Fix review bot issues Looks good. A few hashtable comments: + LiteralTable* literalTable = globalData->literalTable; + const LiteralTable::iterator& iter = literalTable->find(c); + if (iter != literalTable->end()) return iter->second; - pair<HashSet<UString::Rep*>::iterator, bool> addResult = identifierTable.add<const char*, IdentifierCStringTranslator>(c); - - // If the string is newly-translated, then we need to adopt it. - // The boolean in the pair tells us if that is so. - RefPtr<UString::Rep> addedString = addResult.second ? adoptRef(*addResult.first) : *addResult.first; - - literalIdentifierTable.add(c, addedString.get()); - + RefPtr<StringImpl> addedString = globalData->identifierTable->add(c); + literalTable->add(c, addedString.get()); return addedString.release(); I'm surprised that we have a separate table for char*. Weird. Maybe it's just legacy code that can go away? Anyhoo, "literalTable->find" followed by "literalTable->add" is a double-lookup. The idiom for avoiding double-lookup is: pair<iterator, bool> result = literalTable->add(c, 0); if (!result.second) // pre-existing entry return result.first->second; ... result.first->second = addedString.get(); +template<bool isIdentifierTable> +IdentifierOrAtomicStringTable<isIdentifierTable>::~IdentifierOrAtomicStringTable() +{ + HashSet<StringImpl*>::iterator end = m_table.end(); + for (HashSet<StringImpl*>::iterator iter = m_table.begin(); iter != end; ++iter) { + if (isIdentifierTable) + (*iter)->setIsIdentifier(false); + else + (*iter)->setIsAtomic(false); + } +} This would probably be more efficient if you wrote two copies of the loop, and moved the isIdentifierTable test out of the loop. We know that isIdentifierTable is constant inside the loop, but GCC probably doesn't. r=me 216021 5 barraclough 2010-04-22 12:39:08 -0700 > I'm surprised that we have a separate table for char*. Weird. Maybe it's just > legacy code that can go away? This table holds RefPtrs rather than StringImpl*s, I think the idea is to prevernt thrash creating & destroying string objects for literal strings in JSC's source. I'm not sure if it's still necessary, but would rather not change in this patch. > Anyhoo, "literalTable->find" followed by "literalTable->add" is a > double-lookup. The idiom for avoiding double-lookup is: *nod, will do. > This would probably be more efficient if you wrote two copies of the loop, and > moved the isIdentifierTable test out of the loop. We know that > isIdentifierTable is constant inside the loop, but GCC probably doesn't. If you think about it, GCC absolutely must know all template parameter values to code generate to be able to code specialize, which is the whole purpose of templates. This is more obvious in the case where the template parameter is a type, also holds where the template parameter is a value. Still, happy to rejig the check out the loop to make it more obvious that no redundant checking is going on. 216053 6 barraclough 2010-04-22 13:38:57 -0700 Transmitting file data ................ Committed revision 58114. 216061 7 webkit.review.bot 2010-04-22 13:55:29 -0700 http://trac.webkit.org/changeset/58114 might have broken Qt Linux Release 54036 2010-04-22 00:42:19 -0700 2010-04-22 00:47:01 -0700 The patch patch.mergeidenttables.txt text/plain 42482 barraclough SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDU4MDY2KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsNzAgQEAKKzIwMTAtMDQtMjIgIEdhdmluIEJh cnJhY2xvdWdoICA8YmFycmFjbG91Z2hAYXBwbGUuY29tPgorCisgICAgICAgIFJldmlld2VkIGJ5 IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3df YnVnLmNnaT9pZD0zNzk3OAorICAgICAgICBVbmlmeSBKU0M6OklkZW50aWZpZXJUYWJsZSBhbmQg V2ViQ29yZTo6QXRvbWljU3RyaW5nVGFibGUgaW1wbGVtZW50YXRpb25zLgorCisgICAgICAgIFRo ZXNlIHR3byBjbGFzc2VzIGJvdGggaW1wbGVtZW50IGEgSGFzaFNldCBvZiB1bmlxdWVkIFN0cmlu 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