Bug 148440 - DFG::AbstractHeap should be able to distinguish between heap locations that are user-observable and heap locations that are VM-internal
Summary: DFG::AbstractHeap should be able to distinguish between heap locations that a...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: JavaScriptCore (show other bugs)
Version: Other
Hardware: All All
: P2 Normal
Assignee: Nobody
URL:
Keywords:
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Blocks:
 
Reported: 2015-08-25 12:02 PDT by Filip Pizlo
Modified: 2015-08-25 12:02 PDT (History)
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Description Filip Pizlo 2015-08-25 12:02:28 PDT 
If you write to a VM-internal heap, it shouldn't clobber exit, because the user won't know that you had done it.

Note that it's not as simple as that.  Depending on how you define "VM-internal", a VM-internal write might still put the system in a state where OSR exit is invalid even though the write was not user-observable.  So, it's not entirely obvious that this is a good idea, but it's worth thinking about.