• Benedikt Meurer's avatar
    [dx] Support some cross-context async stack traces. · 2aa94749
    Benedikt Meurer authored
    When passing promises from other contexts to an `await`, the
    --harmony-await-optimization doesn't kick in, and as such the
    promise will be wrapped in a "native promise" (from this context).
    That means the promises aren't chained immediately, but delayed
    via a PromiseResolveThenableJob, which chains these promises on
    the next turn of this contexts' microtask queue.
    
    If there's anything happening on the macro task queue in between
    this and the point when an exception is raised, the chaining will
    have happened and we actually find our way back via the promise
    chains. And this CL adds support for exactly that case. For other
    cases, it's currently impossible to reconstruct the async stack
    unfortunately, but we hope that this will help with the major
    use cases, where the developer awaits on I/O.
    
    Bug: v8:7522, v8:8673, v8:9487
    Ref: nodejs/node#28680
    Change-Id: Icc06c7df12644c2d8d43b6c7580ee06bb8f1024a
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1701847
    Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
    Reviewed-by: 's avatarYang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#62709}
    2aa94749
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