81459 2012-03-17 17:15:47 -0700 Strength reduction, RegExp.exec -> RegExp.test 2016-03-05 15:07:39 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 barraclough barraclough jberlin ssandela webkit.review.bot oldest_to_newest 581387 0 barraclough 2012-03-17 17:15:47 -0700 RegExp.prototype.exec & RegExp.prototype.test can both be used to test a regular expression for a match against a string - however exec is more expensive, since it allocates a matches array object. In cases where the result is consumed in a boolean context the allocation of the matches array can be trivially elided. For example: function f() { for (i =0; i < 10000000; ++i) if(!/a/.exec("a")) err = true; } This is a 2.5x speedup on this example microbenchmark loop. In a more advanced for of this optimization, we may be able to avoid allocating the array where access to the array can be observed. 581390 1 132473 barraclough 2012-03-17 17:37:44 -0700 Created attachment 132473 Fix 581391 2 webkit.review.bot 2012-03-17 17:51:08 -0700 Attachment 132473 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1 Source/JavaScriptCore/dfg/DFGOperations.h:64: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:65: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:67: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:68: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:70: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:72: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:73: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:78: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:79: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:80: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:81: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:82: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:83: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:84: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:87: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:90: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:91: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/dfg/DFGOperations.h:94: DFG_OPERATION is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Source/JavaScriptCore/runtime/JSFunction.h:57: The parameter name "nativeFunction" adds no information, so it should be removed. [readability/parameter_name] [5] Source/JavaScriptCore/runtime/RegExpObject.h:70: The parameter name "string" adds no information, so it should be removed. [readability/parameter_name] [5] Source/JavaScriptCore/runtime/RegExpObject.h:71: The parameter name "string" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 21 in 21 files If any of these errors are false positives, please file a bug against check-webkit-style. 581398 3 barraclough 2012-03-17 18:08:43 -0700 Fixed in r111129 581742 4 ssandela 2012-03-19 06:58:35 -0700 Hi Gavin, The code changes are still resulting in windows build break(as of 111160). The error is same as mentioned by win build bot. Can you please fix it ASAP. I am stalled by this. 581838 5 jberlin 2012-03-19 08:55:20 -0700 3>JSBase.obj : warning LNK4217: locally defined symbol ?staticData@WTFThreadData@WTF@@0PAV?$ThreadSpecific@VWTFThreadData@WTF@@@2@A (private: static class WTF::ThreadSpecific<class WTF::WTFThreadData> * WTF::WTFThreadData::staticData) imported in function "public: __thiscall JSC::APIEntryShim::~APIEntryShim(void)" (??1APIEntryShim@JSC@@QAE@XZ) 3>JavaScriptCore.exp : error LNK2001: unresolved external symbol "public: static class JSC::JSFunction * __cdecl JSC::JSFunction::create(class JSC::ExecState *,class JSC::JSGlobalObject *,int,class JSC::Identifier const &,__int64 (__fastcall*)(class JSC::ExecState *),__int64 (__fastcall*)(class JSC::ExecState *))" (?create@JSFunction@JSC@@SAPAV12@PAVExecState@2@PAVJSGlobalObject@2@HABVIdentifier@2@P6I_J0@Z3@Z) 3>C:\cygwin\home\buildbot\slave\win-debug\build\WebKitBuild\Debug\bin\JavaScriptCore.dll : fatal error LNK1120: 1 unresolved externals 3>Build log was saved at "file://C:\cygwin\home\buildbot\slave\win-debug\build\WebKitBuild\Debug\obj\JavaScriptCore\BuildLog.htm" 3>JavaScriptCore - 2 error(s), 16 warning(s) http://build.webkit.org/builders/Windows%20Debug%20%28Build%29/builds/47242/steps/compile-webkit/logs/stdio 581855 6 jberlin 2012-03-19 09:19:34 -0700 (In reply to comment #5) > 3>JSBase.obj : warning LNK4217: locally defined symbol ?staticData@WTFThreadData@WTF@@0PAV?$ThreadSpecific@VWTFThreadData@WTF@@@2@A (private: static class WTF::ThreadSpecific<class WTF::WTFThreadData> * WTF::WTFThreadData::staticData) imported in function "public: __thiscall JSC::APIEntryShim::~APIEntryShim(void)" (??1APIEntryShim@JSC@@QAE@XZ) > 3>JavaScriptCore.exp : error LNK2001: unresolved external symbol "public: static class JSC::JSFunction * __cdecl JSC::JSFunction::create(class JSC::ExecState *,class JSC::JSGlobalObject *,int,class JSC::Identifier const &,__int64 (__fastcall*)(class JSC::ExecState *),__int64 (__fastcall*)(class JSC::ExecState *))" (?create@JSFunction@JSC@@SAPAV12@PAVExecState@2@PAVJSGlobalObject@2@HABVIdentifier@2@P6I_J0@Z3@Z) > 3>C:\cygwin\home\buildbot\slave\win-debug\build\WebKitBuild\Debug\bin\JavaScriptCore.dll : fatal error LNK1120: 1 unresolved externals > 3>Build log was saved at "file://C:\cygwin\home\buildbot\slave\win-debug\build\WebKitBuild\Debug\obj\JavaScriptCore\BuildLog.htm" > 3>JavaScriptCore - 2 error(s), 16 warning(s) > > http://build.webkit.org/builders/Windows%20Debug%20%28Build%29/builds/47242/steps/compile-webkit/logs/stdio Fixed in http://trac.webkit.org/changeset/111188 581974 7 barraclough 2012-03-19 11:28:22 -0700 Ooops!- thanks Jessie! 582704 8 ssandela 2012-03-19 20:54:33 -0700 Hi, The issue is still present when building WebKit project, it is fixed when building JavaScriptCore though. 5> Creating library C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\lib\WebKit.lib and object C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\lib\WebKit.exp 5>WebCore.lib(JSBindingsAllInOne.obj) : error LNK2001: unresolved external symbol "public: static class JSC::JSFunction * __cdecl JSC::JSFunction::create(class JSC::ExecState *,class JSC::JSGlobalObject *,int,class JSC::Identifier const &,__int64 (__fastcall*)(class JSC::ExecState *),enum JSC::Intrinsic,__int64 (__fastcall*)(class JSC::ExecState *))" (?create@JSFunction@JSC@@SAPAV12@PAVExecState@2@PAVJSGlobalObject@2@HABVIdentifier@2@P6I_J0@ZW4Intrinsic@2@3@Z) 5>C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\bin\WebKit.dll : fatal error LNK1120: 1 unresolved externals 583182 9 jberlin 2012-03-20 10:13:32 -0700 (In reply to comment #8) > Hi, The issue is still present when building WebKit project, it is fixed when building JavaScriptCore though. > > 5> Creating library C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\lib\WebKit.lib and object C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\lib\WebKit.exp > 5>WebCore.lib(JSBindingsAllInOne.obj) : error LNK2001: unresolved external symbol "public: static class JSC::JSFunction * __cdecl JSC::JSFunction::create(class JSC::ExecState *,class JSC::JSGlobalObject *,int,class JSC::Identifier const &,__int64 (__fastcall*)(class JSC::ExecState *),enum JSC::Intrinsic,__int64 (__fastcall*)(class JSC::ExecState *))" (?create@JSFunction@JSC@@SAPAV12@PAVExecState@2@PAVJSGlobalObject@2@HABVIdentifier@2@P6I_J0@ZW4Intrinsic@2@3@Z) > 5>C:\cygwin\home\ssandela\new_webkit\WebKit\WebKitBuild\Debug\bin\WebKit.dll : fatal error LNK1120: 1 unresolved externals This was fixed in http://trac.webkit.org/changeset/111197 1171276 10 132473 fpizlo 2016-03-05 15:07:39 -0800 Comment on attachment 132473 Fix View in context: https://bugs.webkit.org/attachment.cgi?id=132473&action=review > Source/JavaScriptCore/dfg/DFGAbstractState.cpp:638 > + case RegExpExec: > + case RegExpTest: > + forNode(node.child1()).filter(PredictCell); > + forNode(node.child2()).filter(PredictCell); > + forNode(nodeIndex).makeTop(); > + break; > + This AI rule is wrong because it fails to call clobberStructures(), or clobberWorld() in the modern DFG. This bug has managed to survive until now! The implication is that RegExpExec/RegExpTest could clobber the world if the second argument is an object with a toString method, but AI would incorrectly assume that all of its structure proofs are still intact. Because of this logic, when we wrote clobberize() we also failed to make RegExpExec/RegExpTest clobber the world there. 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