163302 2016-10-11 15:26:58 -0700 Array.prototype.concat should not modify frozen objects 2016-10-11 16:28:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mark.lam mark.lam andre.bargull bfulgham fpizlo ggaren jfbastien keith_miller msaboff saam oldest_to_newest 1239045 0 mark.lam 2016-10-11 15:26:58 -0700 The ES6 spec for Array.prototype.concat states that it uses the CreateDataPropertyOrThrow() to add items to the result array. The spec for CreateDataPropertyOrThrow states: "This abstract operation creates a property whose attributes are set to the same defaults used for properties created by the ECMAScript language assignment operator. Normally, the property will not already exist. If it does exist and is not configurable or if O is not extensible, [[DefineOwnProperty]] will return false causing this operation to throw a TypeError exception." Since the properties of frozen objects are not extensible nor configurable, Array.prototype.concat should fail to write to the result array if it is frozen. Ref: https://tc39.github.io/ecma262/#sec-array.prototype.concat, https://tc39.github.io/ecma262/#sec-createdatapropertyorthrow, and https://tc39.github.io/ecma262/#sec-createdataproperty. 1239052 1 291307 mark.lam 2016-10-11 15:36:58 -0700 Created attachment 291307 proposed patch. 1239062 2 mark.lam 2016-10-11 15:53:59 -0700 Thanks for the review. I'm going to change the attached test to only runFTLNoCJIT before landing. It doesn't need to run with other configurations. 1239083 3 mark.lam 2016-10-11 16:28:51 -0700 Landed in r207178: <http://trac.webkit.org/r207178>. 291307 2016-10-11 15:36:58 -0700 2016-10-11 15:40:26 -0700 proposed patch. bug-163302.patch text/plain 8647 mark.lam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyMDcxNzApCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDEyIEBACisyMDE2LTEwLTExICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNv bT4KKworICAgICAgICBBcnJheS5wcm90b3R5cGUuY29uY2F0IHNob3VsZCBub3QgbW9kaWZ5IGZy b3plbiBvYmplY3RzLgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5j Z2k/aWQ9MTYzMzAyCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAg ICAgICAgKiBzdHJlc3MvYXJyYXktY29uY2F0LW9uLWZyb3plbi1vYmplY3QuanM6IEFkZGVkLgor CiAyMDE2LTEwLTExICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUuY29tPgogCiAgICAgICAg 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