• Michael Lippautz's avatar
    cppgc: Implement allocation on custom spaces · 611d1bb9
    Michael Lippautz authored
    This patch provides infrastructure to pin object types to specific
    spaces. This allows embedders to create mutual exclusive arenas for
    certain (base) types. In future, this will also be used to provide
    sliding-window compaction on certain custom spaces.
    
    We mainly preserve the existing infrastructure with the difference
    that spaces are now slightly more dynamic than in Blink as they are
    kept in a vector instead of a fixed-size array.
    
    The mechanism differs from Blink in that it does not allow the user
    object to call allocation methods directly but instead provides a
    trait that can be overridden to specify a custom space.
    
    The patch preserves templatization for objects that do not go into
    custom spaces to safe a branch in the allocation hot path.
    
    Change-Id: I08aa6932348e2d6258e19c4a32d189865f459f02
    Bug: chromium:1056170
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2187611
    Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
    Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Reviewed-by: 's avatarOmer Katz <omerkatz@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#67666}
    611d1bb9
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