• Leszek Swirski's avatar
    [offthread] Allow off-thread bytecode finalization · 455cb6c0
    Leszek Swirski authored
    Add the remaining missing templatizations to allow an initial wiring in
    of the off-thread factory into streaming compilation finalization.
    
    The off-thread finalization is behind a flag, disabled by default:
        --finalize-streaming-on-background
    
    When the flag is enabled, background tasks will perform perform the
    finalization during their background execution, and will release the
    parser and compilation jobs once they are no longer needed.
    
    The implementation is complete enough for performance testing, but not
    enough for launch. Notably, there is no support for:
    
      * Class boilerplates (the code is marked unreachable),
      * Exceptions during finalization, i.e. parse/compile warnings/errors,
      * Allocation sampling,
      * Logging,
      * Asm.js,
      * Parallel complication tasks
      * Forced source positions (for "NeedsDetailedOptimizedCodeLineInfo()")
    
    This patch also adds some tracing events for the various stages of the
    off-thread finalization (including the main-thread merge) for further
    performance improvements.
    
    Bug: chromium:1011762
    Change-Id: Ia44fa56975dd689f0d92c1543b294cdb063eb199
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2066965
    Commit-Queue: Leszek Swirski <leszeks@chromium.org>
    Auto-Submit: Leszek Swirski <leszeks@chromium.org>
    Reviewed-by: 's avatarClemens Backes <clemensb@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66566}
    455cb6c0
asm-js.cc 17.7 KB