[Webkit-unassigned] [Bug 152315] New: Introducing ScratchRegisterAllocator::PreservedState.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152315

            Bug ID: 152315
           Summary: Introducing ScratchRegisterAllocator::PreservedState.
    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

restoreReusedRegistersByPopping() should always be called with 2 values that matches the expectation of preserveReusedRegistersByPushing().  Those 2 values are the number of bytes preserved and the ExtraStackSpace requirement.  By encapsulating them in a ScratchRegisterAllocator::PreservedState, we can make this less error prone by only passing restoreReusedRegistersByPopping() the appropriate PreservedState that its matching preserveReusedRegistersByPushing() returned.

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