200562 2019-08-08 21:38:29 -0700 [JSC] Refactor our [[Put]] to match to the latest spec 2019-08-09 01:56:25 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 199864 1 ysuzuki ysuzuki oldest_to_newest 1559797 0 ysuzuki 2019-08-08 21:38:29 -0700 ... 1559831 1 ysuzuki 2019-08-09 01:56:25 -0700 The refactoring design is the following, 1. Remove JSObject::put hook 2. Add JSObject::attemptToSetOwnProperty, which only does [[Put]]’s own setter part. It does not involve any [[Prototype]] traversing etc. 3. Define non-virtual JSObject::put method, which does traversing and static-property initialization too. 4. (2) is only called when the structure has some flags. This flag must be correctly maintained by structure transition. 5. (2) correctly set PutPropertySlot’s status 6. Even (2) is invoked, we still see cacheable status through PutPropertySlot. Each attemptToSetOwnProperty implementation should take care of maintaining it.