140093 2015-01-05 13:07:04 -0800 Argument object created by "Function dot arguments" should use a clone of argument values 2015-01-15 11:21:03 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 139827 1 mark.lam mark.lam commit-queue fpizlo ggaren mark.lam mmirman msaboff webkit-bug-importer oldest_to_newest 1058783 0 mark.lam 2015-01-05 13:07:04 -0800 After https://bugs.webkit.org/show_bug.cgi?id=139827, a few test failures will start failing. One of them is dfg-tear-off-arguments-not-activation.js, which can be run this way: $ jsc --useFTLJIT\=false --enableFunctionDotArguments\=true --testTheFTL\=true --useFTLJIT\=true resources/standalone-pre.js dfg-tear-off-arguments-not-activation.js resources/standalone-post.js The relevant code is as follows: function bar() { return foo.arguments; } function foo(p) { var x = 42; if (p) return (function() { return x; }); else return bar(); } In this case, foo() has no knowledge of bar() needing the LexicalEnvironment and has dead code eliminated the SetLocal that stores it into its designated local. In bar(), the factory for the Arguments object (for creating foo.arguments) tries to read foo's LexicalEnvironment from its designated lexicalEnvironment local, but instead, finds it to be uninitialized. This results in a null pointer access which causes a crash. This can be resolved by having bar() instantiate a clone of the Arguments object instead, and populate its elements with values fetched directly from foo's frame. There's no need to reference foo's LexicalEnvironment (whether present or not). 1058786 1 webkit-bug-importer 2015-01-05 13:28:00 -0800 <rdar://problem/19377712> 1058793 2 243998 mark.lam 2015-01-05 13:36:04 -0800 Created attachment 243998 the patch. This patch is for keeping track of the work in progress. Will finalize this fix once the remaining issues that fall out of <https://webkit.org/b/139827> become clearer. 1059895 3 244277 mark.lam 2015-01-08 11:50:54 -0800 Created attachment 244277 patch 2: fixed a typo in the ChangeLog. 1059997 4 244277 ggaren 2015-01-08 16:07:19 -0800 Comment on attachment 244277 patch 2: fixed a typo in the ChangeLog. r=me 1060002 5 ggaren 2015-01-08 16:10:11 -0800 You should also add a test, if one doesn't exist, that notes the change in behavior in this case: function a(arg0) { var unused = arguments; arg0 = "changed"; return function b() { var unused = arg0; return a.arguments[0]; } } a("original")(); Before your patch, you'll get "changed", and after you'll get "original". 1060005 6 mark.lam 2015-01-08 16:12:24 -0800 (In reply to comment #5) > You should also add a test, if one doesn't exist, that notes the change in > behavior in this case: ... OK, will do. 1060016 7 244277 commit-queue 2015-01-08 16:49:37 -0800 Comment on attachment 244277 patch 2: fixed a typo in the ChangeLog. Clearing flags on attachment: 244277 Committed r178145: <http://trac.webkit.org/changeset/178145> 1060017 8 commit-queue 2015-01-08 16:49:41 -0800 All reviewed patches have been landed. Closing bug. 1061028 9 mark.lam 2015-01-13 18:48:36 -0800 (In reply to comment #5) > You should also add a test, if one doesn't exist, that notes the change in > behavior in this case: > > function a(arg0) > { > var unused = arguments; > arg0 = "changed"; > return function b() > { > var unused = arg0; > return a.arguments[0]; > } > } > > a("original")(); > > Before your patch, you'll get "changed", and after you'll get "original". Turns out this use of function dot argument does not do what we think it does. The value of a.arguments in b turns out to be null. This is consistently so in Safari, Chrome, and Firefox. If b() was invoked while a() is still on the stack (invoked either directly or indirectly from inside a()), then a.arguments[0] will be "changed" (also consistently so across all 3 browsers). With WebKit ToT, something appears to be broken. The cases that should have returned "changed" is now returning undefined. Will investigate. 1061242 10 ggaren 2015-01-14 11:08:48 -0800 > Turns out this use of function dot argument does not do what we think it > does. The value of a.arguments in b turns out to be null. This is > consistently so in Safari, Chrome, and Firefox. It does what we think it does -- I just wrote the test case incorrectly. Here is the correct test: > > function a(arg0) > > { > > var unused = arguments; > > arg0 = "changed"; > > return (function b() > > { > > var unused = arg0; > > return a.arguments[0]; > > })(); > > } 1061466 11 mark.lam 2015-01-14 20:39:44 -0800 Reopened because we've found that the previous patch is insufficient. Will upload a follow up patch in a moment. 1061468 12 244676 mark.lam 2015-01-14 20:40:27 -0800 Created attachment 244676 patch 2: fixed bugs from the previous patch + add needed tests. 1061578 13 244676 ggaren 2015-01-15 10:40:41 -0800 Comment on attachment 244676 patch 2: fixed bugs from the previous patch + add needed tests. View in context: https://bugs.webkit.org/attachment.cgi?id=244676&action=review r=me with comments > Source/JavaScriptCore/runtime/Arguments.cpp:389 > + if (isTornOff()) > + return; This should be an ASSERT. Only non-cloned arguments is ambiguous about when it will be torn off. > Source/JavaScriptCore/runtime/Arguments.cpp:399 > + ASSERT(!m_slowArgumentData.get()); No need for .get() here. > Source/JavaScriptCore/runtime/Arguments.cpp:408 > + if (isTornOff()) > + return; Ditto. > Source/JavaScriptCore/runtime/Arguments.cpp:415 > + ASSERT(!m_slowArgumentData.get()); Ditto. 1061593 14 mark.lam 2015-01-15 11:21:03 -0800 Thanks for the review. The patch has been updated based on the feedback, and landed in r178517: <http://trac.webkit.org/r178517>. 243998 2015-01-05 13:36:04 -0800 2015-01-08 11:50:54 -0800 the patch. bug-140093.patch text/plain 4342 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTc3OTI0KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQxIEBA CisyMDE1LTAxLTA1ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBB cmd1bWVudCBvYmplY3QgY3JlYXRlZCBieSAiRnVuY3Rpb24gZG90IGFyZ3VtZW50cyIgc2hvdWxk IHVzZSBhIGNsb25lIHRoZSBhcmd1bWVudCB2YWx1ZXMuCisgICAgICAgIDxodHRwczovL3dlYmtp dC5vcmcvYi8xNDAwOTM+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisK KyAgICAgICAgQWZ0ZXIgdGhlIGNoYW5nZSBpbiA8aHR0cHM6Ly93ZWJraXQub3JnL2IvMTM5ODI3 PiwgdGhlIGRmZy10ZWFyLW9mZi1hcmd1bWVudHMtbm90LWFjdGl2YXRpb24uanMKKyAgICAgICAg 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