[Webkit-unassigned] [Bug 159470] New: Modify bytecode generation for finally blocks so that we don't have to duplicate them.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159470

            Bug ID: 159470
           Summary: Modify bytecode generation for finally blocks so that
                    we don't have to duplicate them.
    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

Instead, we can simply pass to Register values to finally block:
1. a JSValue to throw or to return.
2. an int enum value indicating an action to take at the end of the finally block:
    a. FallThru: fall thru to next block.
    b. Return: return the stashed returned value if this finally block does not have an outer finally block; else jump to outer finally block.
    c. Throw; throw the stashed thrown value.  It will automatically be caught by outer catch and finally blocks if present.

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