Bug 162319 - DFG::StoreBarrierInsertionPhase should assume that any epoch increment may make objects older
Summary: DFG::StoreBarrierInsertionPhase should assume that any epoch increment may ma...
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: JavaScriptCore (show other bugs)
Version: WebKit Nightly Build
Hardware: All All
: P2 Normal
Assignee: Filip Pizlo
URL:
Keywords:
Depends on:
Blocks: 149432
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Reported: 2016-09-20 14:24 PDT by Filip Pizlo
Modified: 2016-09-20 15:59 PDT (History)
5 users (show)

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Attachments
the patch (5.61 KB, patch)
2016-09-20 15:46 PDT, Filip Pizlo 		saam: review+
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Description Filip Pizlo 2016-09-20 14:24:40 PDT 
If you just allocated an object, then it's true that the object must be white.  But as soon as you do anything to it, it will become black.  The insertion phase needs to be smart about this.
Comment 1 Filip Pizlo 2016-09-20 15:46:32 PDT 
Created attachment 289406 [details]
the patch
Comment 2 Filip Pizlo 2016-09-20 15:59:47 PDT 
Landed in http://trac.webkit.org/changeset/206183