• Leszek Swirski's avatar
    [serializer] Introduce HandleScopes for object contents · c212d10d
    Leszek Swirski authored
    Create a HandleScope when serializing an object's contents, to reduce
    the number of live handles during serialization. There's only a couple
    of cases where these handles have to outlive the serialized contents,
    and for these cases we introduce GlobalHandleVector or similar manual
    strong root mechanisms.
    
    In particular, backrefs don't actually need to exist as a handle vector
    (the object addresses are already referred to by the reference map's
    IdentityMap), except for DCHECKs, so this becomes a DEBUG-only global
    handle vector.
    
    To support this manual strong-rooting, the HotObjectList is split up
    into a strong-rooted find-only class in Serializer, and a Handle
    vector in Deserializer.
    
    Bug: chromium:1075999
    Change-Id: I586eeeb543e3f6c934c168961b068f2c34e72456
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2449980Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Reviewed-by: 's avatarJakob Gruber <jgruber@chromium.org>
    Commit-Queue: Leszek Swirski <leszeks@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#70411}
    c212d10d
startup-serializer.cc 11 KB