[Webkit-unassigned] [Bug 160666] New: ASSERTION FAILED: hasInlineStorage() in JSFinalObject::visitChildren().

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160666

            Bug ID: 160666
           Summary: ASSERTION FAILED: hasInlineStorage() in
                    JSFinalObject::visitChildren().
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

This assertion is benign.  JSFinalObject::visitChildren() calls JSObject::inlineStorage() to get a pointer to the object's inline storage, and later passes it to visitor.appendValuesHidden() with a previously computed storageSize.  When storageSize is 0, appendValuesHidden() ends up doing nothing.  However, before we get there, JSObject::inlineStorage() will be asserting hasInlineStorage() and this assertion will fail when storageSize is 0.

We can fix this assertion failure by simply adding a storageSize check before calling hasInlineStorage() and visitor.appendValuesHidden().

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