• Ulan Degenbaev's avatar
    Revert "Reland x5 [arraybuffer] Rearchitect backing store ownership" · 9da34831
    Ulan Degenbaev authored
    This reverts commit 62e16830.
    
    Reason for revert: it will be relanded after branch
    
    Original change's description:
    > Reland x5 [arraybuffer] Rearchitect backing store ownership
    > 
    > This reverts commit 8fdb2387.
    > 
    > Original change's description:
    > > "Reland x4 [arraybuffer] Rearchitect backing store ownership"
    > >
    > > This is a reland of bc33f5ae
    > >
    > > Contributed by titzer@chromium.org
    > >
    > > Original change's description:
    > > > [arraybuffer] Rearchitect backing store ownership
    > > >
    > > > This CL completely rearchitects the ownership of array buffer backing stores,
    > > > consolidating ownership into a {BackingStore} C++ object that is tracked
    > > > throughout V8 using unique_ptr and shared_ptr where appropriate.
    > > >
    > > > Overall, lifetime management is simpler and more explicit. The numerous
    > > > ways that array buffers were initialized have been streamlined to one
    > > > Attach() method on JSArrayBuffer. The array buffer tracker in the
    > > > GC implementation now manages std::shared_ptr<BackingStore> pointers,
    > > > and the construction and destruction of the BackingStore object itself
    > > > handles the underlying page or embedder-allocated memory.
    > > >
    > > > The embedder API remains unchanged for now. We use the
    > > > v8::ArrayBuffer::Contents struct to hide an additional shared_ptr to
    > > > keep the backing store alive properly, even in the case of aliases
    > > > from live heap objects. Thus the embedder has a lower chance of making
    > > > a mistake. Long-term, we should move the embedder to a model where they
    > > > manage backing stores using shared_ptr to an opaque backing store object.
    > >
    > > TBR=yangguo@chromium.org
    > >
    > > BUG=v8:9380,v8:9221,chromium:986318
    > >
    > > Change-Id: If671a4a9ca0476e8f084efae46e0d2bf99ed99ef
    > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1731005
    > > Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
    > > Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
    > > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > > Cr-Commit-Position: refs/heads/master@{#63041}
    > 
    > TBR=yangguo@chromium.org,clemensh@chromium.org,mstarzinger@chromium.org
    > 
    > Change-Id: Iba55c7ab71e5642b5cb6aeb699d6fc9cf9061486
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771795
    > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    > Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#63461}
    
    TBR=ulan@chromium.org,mlippautz@chromium.org
    
    Change-Id: Id8f67a68ab398032eb2975b1b24ee125394d9c4b
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1776095Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63471}
    9da34831
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