128633 2014-02-11 16:25:44 -0800 Web Replay: capture and replay nondeterminism of Date.now() and Math.random() 2014-02-12 19:29:26 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 bburg bburg fpizlo ggaren joepeck oldest_to_newest 979653 0 bburg 2014-02-11 16:25:44 -0800 These are the only sources of nondeterminism implemented in JSC that are visible to script (excluding VM bugs, etc). For Math.random(), the seed given to WeakRandom can be memoized. For Date.now() and new Date(), we have to memoize each call. 979680 1 223920 bburg 2014-02-11 17:25:03 -0800 Created attachment 223920 patch 979687 2 223920 fpizlo 2014-02-11 17:41:44 -0800 Comment on attachment 223920 patch View in context: https://bugs.webkit.org/attachment.cgi?id=223920&action=review R=me but please consider encapsulating the #if ENABLE(WEB_REPLAY) inside a clever macro. > Source/JavaScriptCore/runtime/DateConstructor.cpp:128 > +#if ENABLE(WEB_REPLAY) > + value = deterministicCurrentTime(globalObject); > +#else > value = jsCurrentTime(); > +#endif Can't you have a macro like REPLAY(jsCurrentTime(), deterministicCurrentTime(globalObject))? The reason why I would like that more is that #if's can often disturb our ability to visualize the nesting of control flow. The definition of REPLAY would literally be: #if ENABLE(WEB_REPLAY) #define REPLAY(a, b) (b) #else #define REPLAY(a, b) (a) #endif You can call REPLAY() whatever you like... > Source/JavaScriptCore/runtime/DateConstructor.cpp:214 > +#if ENABLE(WEB_REPLAY) > + return JSValue::encode(jsNumber(deterministicCurrentTime(exec->lexicalGlobalObject()))); > +#else > + UNUSED_PARAM(exec); > return JSValue::encode(jsNumber(jsCurrentTime())); > +#endif Another fine example of a place where that REPLAY() macro would simplify things. 980063 3 223920 bburg 2014-02-12 16:07:45 -0800 Comment on attachment 223920 patch View in context: https://bugs.webkit.org/attachment.cgi?id=223920&action=review >> Source/JavaScriptCore/runtime/DateConstructor.cpp:128 >> +#endif > > Can't you have a macro like REPLAY(jsCurrentTime(), deterministicCurrentTime(globalObject))? > > The reason why I would like that more is that #if's can often disturb our ability to visualize the nesting of control flow. The definition of REPLAY would literally be: > > #if ENABLE(WEB_REPLAY) > #define REPLAY(a, b) (b) > #else > #define REPLAY(a, b) (a) > #endif > > You can call REPLAY() whatever you like... Sure thing, I can add that. It will only help out in cases where the difference is which function to call, but that's fine. (Most replay-oriented hooks add a branch without interleaving the normal code path.) 980071 4 223920 joepeck 2014-02-12 16:18:50 -0800 Comment on attachment 223920 patch View in context: https://bugs.webkit.org/attachment.cgi?id=223920&action=review > Source/JavaScriptCore/runtime/DateConstructor.cpp:88 > + if (cursor.isCapturing()) > + cursor.appendInput<GetCurrentTime>(currentTime); > + > + if (cursor.isReplaying()) { If a cursor cannot be both capturing and replaying then this can be an "else if" instead of another if. Or the states could move to an enum (Default, Capturing, Replaying). > Source/JavaScriptCore/runtime/JSGlobalObject.cpp:793 > + if (cursor.isCapturing()) > + cursor.appendInput<SetRandomSeed>(m_weakRandom.seedUnsafe()); > + > + if (cursor.isReplaying()) { Ditto 980136 5 bburg 2014-02-12 19:29:26 -0800 Committed r164007: <http://trac.webkit.org/changeset/164007> 223920 2014-02-11 17:25:03 -0800 2014-02-12 16:18:50 -0800 patch bug-128633-20140211172502.patch text/plain 15422 bburg U3VidmVyc2lvbiBSZXZpc2lvbjogMTYzOTE4CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAw NjljZDVhMzY1ZTYwYzM1NTdjYmNjNjlmMmViYmRmOTA1MjJhOGExLi5hZDYzMGJhZGJkMTUzY2Ri M2NiYmNjNTkwNDRiNzA4OTQ0YjE1NTI5IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs NSArMSw1MCBAQAogMjAxNC0wMi0xMSAgQnJpYW4gQnVyZyAgPGJidXJnQGFwcGxlLmNvbT4KIAor 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