[Webkit-unassigned] [Bug 197940] New: [JSC] Shrink Metadata

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197940

            Bug ID: 197940
           Summary: [JSC] Shrink Metadata
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ysuzuki at apple.com

It turns out that MetadataTable including UnlinkedMetadataTable takes much memory in Gmail (from 7MB to 50MB).
While we should shrink UnlinkedMetadataTable's offset table, we also should shrink Metadata itself.

The histogram taken in Gmail shows that the following metadata is significant.

1. op_call
3. op_resolve_scope
4. op_get_from_scope
5. op_get_by_id

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