• Clemens Backes's avatar
    [wasm] Avoid unnecessary jump tables · 1403fd7d
    Clemens Backes authored
    If multiple code spaces are created, each of them currently gets its own
    jump table (on 64 bit platforms). Since we try to allocate new code
    spaces right after existing ones, this is often not necessary. We could
    instead reuse the existing jump table(s).
    This saves code space for the unneeded jump tables and avoid the cost of
    patching the redundant jump tables when we replace code objects.
    
    This CL implements this by checking whether an existing jump table (or
    pair of far jump table and (near) jump table) fully covers a new code
    space, and reuses the existing jump table in that case.
    
    R=ahaas@chromium.org
    
    Change-Id: Id8751b9c4036cf8f85f9baa2b0be8b2cfb5716ff
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2043846Reviewed-by: 's avatarAndreas Haas <ahaas@chromium.org>
    Commit-Queue: Clemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66364}
    1403fd7d
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