153564 2016-01-27 15:21:25 -0800 Exits from exceptions shouldn't jettison code 2016-01-29 11:46:33 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 saam saam benjamin commit-queue fpizlo ggaren gskachkov keith_miller mark.lam msaboff oliver sukolsak ysuzuki oldest_to_newest 1159469 0 saam 2016-01-27 15:21:25 -0800 ... 1159558 1 saam 2016-01-27 17:59:25 -0800 We can also get rid of some cruft by having the ExitKind indicate what type of exception OSR exit we're talking about. 1159562 2 saam 2016-01-27 18:10:47 -0800 looks like this will definitely help performance Benchmark report for JSRegress on il0204d-dhcp25 (MacBookPro11,3). VMs tested: "og" at /Volumes/Data/WK/b/OpenSource/WebKitBuild/Release/jsc (r195645) "change" at /Volumes/Data/WK/a/OpenSource/WebKitBuild/Release/jsc (r195645) Collected 8 samples per benchmark/VM, with 8 VM invocations per benchmark. Emitted a call to gc() between sample measurements. Used 1 benchmark iteration per VM invocation for warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing. Reporting benchmark execution times with 95% confidence intervals in milliseconds. og change getter-richards-try-catch 1296.7368+-11.5669 ^ 1206.6882+-19.2748 ^ definitely 1.0746x faster raytrace-with-empty-try-catch 7.3843+-0.0815 ? 7.4357+-0.3705 ? raytrace-with-try-catch 13.1908+-0.3264 ^ 12.1172+-0.4045 ^ definitely 1.0886x faster richards-empty-try-catch 56.1763+-0.1751 ? 56.3730+-0.2648 ? richards-try-catch 314.1001+-9.7033 ^ 288.1630+-1.3862 ^ definitely 1.0900x faster try-catch-get-by-val-cloned-arguments 8.6644+-0.2921 ? 9.0188+-0.3390 ? might be 1.0409x slower try-catch-get-by-val-direct-arguments 2.7748+-0.1006 ? 2.7958+-0.1077 ? try-catch-get-by-val-scoped-arguments 5.2259+-0.1285 ? 5.5866+-0.8754 ? might be 1.0690x slower v8-raytrace-with-empty-try-catch 63.1979+-0.8866 ? 64.5806+-2.9587 ? might be 1.0219x slower v8-raytrace-with-try-catch 83.9681+-3.3076 ^ 77.9368+-1.0780 ^ definitely 1.0774x faster <geometric> 32.8874+-0.1316 32.2882+-0.4736 might be 1.0186x faster 1159570 3 270074 saam 2016-01-27 18:52:13 -0800 Created attachment 270074 patch 1159573 4 commit-queue 2016-01-27 19:07:30 -0800 Attachment 270074 did not pass style-queue: ERROR: Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp:135: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/ftl/FTLOSRExit.cpp:120: Wrong number of spaces before statement. (expected: 8) [whitespace/indent] [4] Total errors found: 2 in 24 files If any of these errors are false positives, please file a bug against check-webkit-style. 1159772 5 270074 ggaren 2016-01-28 10:37:17 -0800 Comment on attachment 270074 patch View in context: https://bugs.webkit.org/attachment.cgi?id=270074&action=review r=me > Source/JavaScriptCore/bytecode/ExitKind.cpp:96 > +bool exitKindCausesJettison(ExitKind kind) I would call this exitKindCanJettison. "causes" made me think it always causes -- but in fact you have to meet the exit kind requirement and the count requirement before you jettison. > Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:10254 > + switch (exceptionType) { > + case ExceptionType::JSCall: > + case ExceptionType::GetById: > + case ExceptionType::PutById: > + exitKind = GenericUnwind; > + break; > + case ExceptionType::LazySlowPath: > + case ExceptionType::BinaryOpGenerator: > + exitKind = ExceptionCheck; > + break; I don't love these names for these concepts. I think it would nicer to go with something that distinguished "I threw the exception" from "my callee threw the exception". Maybe: LocalException ChildException OR DirectException IndirectException OR Exception CalleeException 1160190 6 saam 2016-01-29 11:31:41 -0800 (In reply to comment #5) > Comment on attachment 270074 [details] > patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=270074&action=review > > r=me > > > Source/JavaScriptCore/bytecode/ExitKind.cpp:96 > > +bool exitKindCausesJettison(ExitKind kind) > > I would call this exitKindCanJettison. "causes" made me think it always > causes -- but in fact you have to meet the exit kind requirement and the > count requirement before you jettison. > > > Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:10254 > > + switch (exceptionType) { > > + case ExceptionType::JSCall: > > + case ExceptionType::GetById: > > + case ExceptionType::PutById: > > + exitKind = GenericUnwind; > > + break; > > + case ExceptionType::LazySlowPath: > > + case ExceptionType::BinaryOpGenerator: > > + exitKind = ExceptionCheck; > > + break; > > I don't love these names for these concepts. > > I think it would nicer to go with something that distinguished "I threw the > exception" from "my callee threw the exception". > > Maybe: > > LocalException > ChildException > > OR > > DirectException > IndirectException > > OR > > Exception > CalleeException I think these names make sense because it hints at our JIT code doing the exception check versus other JIT code jumping to our JIT code. A callee can throw an exception without us doing a GenericUnwind exception. 1160191 7 saam 2016-01-29 11:33:27 -0800 I'm not sure "generic unwind" is the best name in general, and I think it might make sense to rename those one day to something more meaningful. But, given that we use genericUnwind, I think an OSRExit that has kind GenericUnwind indicates that genericUnwind found our exit machine code and that whatever exception machinery is running will jump to our GenericUnwind exit. 1160193 8 270074 saam 2016-01-29 11:34:33 -0800 Comment on attachment 270074 patch View in context: https://bugs.webkit.org/attachment.cgi?id=270074&action=review >>> Source/JavaScriptCore/bytecode/ExitKind.cpp:96 >>> +bool exitKindCausesJettison(ExitKind kind) >> >> I would call this exitKindCanJettison. "causes" made me think it always causes -- but in fact you have to meet the exit kind requirement and the count requirement before you jettison. > > I think these names make sense because it hints at our JIT code doing the exception > check versus other JIT code jumping to our JIT code. A callee can throw an exception > without us doing a GenericUnwind exception. I'll go with "exitKindMayJettison" to better indicate that a threshold has to be reached. 1160195 9 fpizlo 2016-01-29 11:36:22 -0800 (In reply to comment #6) > (In reply to comment #5) > > Comment on attachment 270074 [details] > > patch > > > > View in context: > > https://bugs.webkit.org/attachment.cgi?id=270074&action=review > > > > r=me > > > > > Source/JavaScriptCore/bytecode/ExitKind.cpp:96 > > > +bool exitKindCausesJettison(ExitKind kind) > > > > I would call this exitKindCanJettison. "causes" made me think it always > > causes -- but in fact you have to meet the exit kind requirement and the > > count requirement before you jettison. > > > > > Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:10254 > > > + switch (exceptionType) { > > > + case ExceptionType::JSCall: > > > + case ExceptionType::GetById: > > > + case ExceptionType::PutById: > > > + exitKind = GenericUnwind; > > > + break; > > > + case ExceptionType::LazySlowPath: > > > + case ExceptionType::BinaryOpGenerator: > > > + exitKind = ExceptionCheck; > > > + break; > > > > I don't love these names for these concepts. > > > > I think it would nicer to go with something that distinguished "I threw the > > exception" from "my callee threw the exception". > > > > Maybe: > > > > LocalException > > ChildException I don't know what either of these things mean. > > > > OR > > > > DirectException > > IndirectException You could argue that genericUnwind is direct because it doesn't involve a check in generated code. You could argue that the excetpion check is direct because it doesn't involve calling genericUnwind. These names aren't going to work. > > > > OR > > > > Exception > > CalleeException I don't know what either of these things mean. All exceptions come from callees. > I think these names make sense because it hints at our JIT code doing the > exception > check versus other JIT code jumping to our JIT code. A callee can throw an > exception > without us doing a GenericUnwind exception. The point of these ExitKinds is to tell you if the exception involved GenericUnwind. Let's please use a name that makes this clear. If we don't like the name "GenericUnwind" then we should rename that function to something else globally. Whatever name the "genericUnwind" function has, that's the name that the ExitKind that corresponds to it should also have. 1160204 10 saam 2016-01-29 11:46:33 -0800 landed in: http://trac.webkit.org/changeset/195831 270074 2016-01-27 18:52:13 -0800 2016-01-28 10:37:17 -0800 patch c-backup.diff text/plain 79359 saam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTk1NzIyKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDEwMyBA QAorMjAxNi0wMS0yNyAgU2FhbSBiYXJhdGkgIDxzYmFyYXRpQGFwcGxlLmNvbT4KKworICAgICAg ICBFeGl0cyBmcm9tIGV4Y2VwdGlvbnMgc2hvdWxkbid0IGpldHRpc29uIGNvZGUKKyAgICAgICAg aHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE1MzU2NAorCisgICAgICAg IFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFdlIGNyZWF0ZSB0d28gbmV3 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