• Simon Zünd's avatar
    Forward exceptions while using DebugPropertyIterator · af7e6893
    Simon Zünd authored
    The V8 inspector is using the DebugPropertyIterator (a debug only
    interface) while building RemoteObjects. The DebugPropertyIterator
    uses the `KeyAccumulator::GetKeys` for this, which can potentially
    throw, but the DebugPropertyIterator ignores exceptions and keeps
    iterating. If multiple iteration steps throw an exception
    (e.g. due to a pending stack overflow), we run into a CHECK in
    Isolate::Throw, as we can't throw exceptions while another
    exception is still pending.
    
    This CL fixes the CHECK crash by properly propagating exceptions
    after the iterator is created or advanced and returning early
    in the inspector if an exception happens.
    
    Please note that the regression test that showcases this behavior
    is still disabled, as fixing the crash causes currently an
    endless loop. While the exception in `ValueMirror::getProperties`
    is handled by early returing, we still need to forward it as
    the result of the `Runtime::evaluate` all the way up the stack.
    
    R=bmeurer@chromium.org, yangguo@chromium.org
    
    Bug: chromium:1080638
    Change-Id: I1d55e0d70490a06a6bc1b0a3525236411da7f64b
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2639954Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
    Reviewed-by: 's avatarYang Guo <yangguo@chromium.org>
    Commit-Queue: Simon Zünd <szuend@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#72203}
    af7e6893