• Michael Lippautz's avatar
    cppgc: Introduce AllocationHandle · 935d9151
    Michael Lippautz authored
    Unified heap support in V8 requires having another (at least internal)
    heap that implements a unfied garbage collection strategy. This will
    not re-use the already existing cppgc::Heap because there should be no
    way in creating such a heap externally or scheduling stand-alone
    garbage collections.
    
    In order to have a common token, this CL introduces AllocationHandle
    which can be passed to MakeGarbageCollected to allocate C++ objects.
    V8 (soon) and the stand-alone heap both have methods to retrieve such
    a handle.
    
    This works around a problem with creating diamond class hierarchies
    when a base class would be exposed on the public API level.
    
    Fast paths for Blink are still possible because allocation handles can
    be cached the same way (e.g. global, or TLS) as a heap can be cached.
    
    Tbr: yangguo@chromium.org
    Bug: chromium:1056170
    Change-Id: I8e9472a2c24ef82d1178953e8429b1fd8a2344bc
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2238027
    Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
    Reviewed-by: 's avatarOmer Katz <omerkatz@chromium.org>
    Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#68310}
    935d9151
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