• Seth Brenith's avatar
    Fix counting ignition dispatches · 82b673bc
    Seth Brenith authored
    The flag --trace-ignition-dispatches has been broken for a long time,
    since it was not designed to work with bytecode handlers that are
    generated ahead of time by mksnapshot. This splits the existing
    --trace-ignition-dispatches logic into two separate parts:
    
    1. A gn argument which instructs mksnapshot to include dispatch counting
       in the bytecode handlers, and ensures that the Interpreter allocates
       the array of counters, and
    2. A runtime flag which enables the ignition-statistics extension which
       implements the JS-accessible function getIgnitionDispatchCounters().
    
    Change-Id: I89323425697f5641451f67b9ddcc0303b8ca209f
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2937564Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
    Cr-Commit-Position: refs/heads/master@{#74992}
    82b673bc
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