96227 2012-09-09 22:08:18 -0700 DFG misses arguments tear-off for function.arguments if 'arguments' is used 2012-09-10 14:48:53 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 ggaren ggaren barraclough dglazkov fpizlo oliver webkit.review.bot oldest_to_newest 715711 0 ggaren 2012-09-09 22:08:18 -0700 DFG misses arguments tear-off for function.arguments if 'arguments' is used 715712 1 163039 ggaren 2012-09-09 22:09:14 -0700 Created attachment 163039 Patch 715713 2 163039 ggaren 2012-09-09 22:11:19 -0700 Comment on attachment 163039 Patch Uploading for discussion. This patch eliminates aliasing of the local 'arguments' property, and makes function.arguments always tear off. Another way to fix this bug, and keep our current behavior without regression, is to use watchpoints. 715714 3 ggaren 2012-09-09 22:14:04 -0700 Here's what I know about the state of function.arguments: - It's non-standard: Mozilla invented and then deprecated it; ES4 never mentioned it; and ES5 explicitly poisons it in strict mode. - Compatibility matrix of arguments == function.arguments: Firefox: never IE: never, but function.arguments == function.arguments Chrome: if caller uses 'arguments' Safari: if caller uses 'arguments' Compatibility matrix of what function.arguments contains: Firefox: current snapshot Chrome: current snapshot Safari: current snapshot IE: original snapshot Based on this matrix, the best compatibility story by market share seems to be: - function.arguments doesn't alias 'arguments' (IE + Firefox) - function.arguments snapshots current argument values (Chrome + Firefox + Safari) 715715 4 163039 fpizlo 2012-09-09 22:17:42 -0700 Comment on attachment 163039 Patch I think that your change implies that using 'arguments' should not cause the DFG to assume that arguments (i.e. the actual arguments, not the 'arguments' local) are captured. You should probably make that part of this change, as well - or at least file a separate bug indicating that we should kill off that code in the future. Other than that, I have no objections to this change. 715755 5 163039 webkit.review.bot 2012-09-09 23:55:10 -0700 Comment on attachment 163039 Patch Attachment 163039 did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/13795743 New failing tests: fast/js/dfg-tear-off-function-dot-arguments.html 716358 6 ggaren 2012-09-10 12:24:01 -0700 Notions of "captured arguments" that may need fixup: CodeBlock capturedVars bitvector needs to match variableAccessData isCaptured flag ByteCodeParser initialization All isCaptured() queries other than VariableAccessData queries should just forward to the CodeBlock. 716465 7 163198 ggaren 2012-09-10 13:47:54 -0700 Created attachment 163198 compatibility test 716468 8 163199 ggaren 2012-09-10 13:49:28 -0700 Created attachment 163199 compatibility test 716487 9 163203 ggaren 2012-09-10 13:58:00 -0700 Created attachment 163203 compatibility test 716491 10 163204 ggaren 2012-09-10 14:01:22 -0700 Created attachment 163204 compatibility test 716492 11 163205 ggaren 2012-09-10 14:02:53 -0700 Created attachment 163205 compatibility test 716549 12 ggaren 2012-09-10 14:48:53 -0700 Committed r128111: <http://trac.webkit.org/changeset/128111> 163039 2012-09-09 22:09:14 -0700 2012-09-09 23:55:10 -0700 Patch bug-96227-20120909220858.patch text/plain 5214 ggaren SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTI4MDE1KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE3IEBA CisyMDEyLTA5LTA5ICBHZW9mZnJleSBHYXJlbiAgPGdnYXJlbkBhcHBsZS5jb20+CisKKyAgICAg ICAgREZHIG1pc3NlcyBhcmd1bWVudHMgdGVhci1vZmYgZm9yIGZ1bmN0aW9uLmFyZ3VtZW50cyBp ZiAnYXJndW1lbnRzJyBpcyB1c2VkCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD05NjIyNworCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEp 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