• Francis McCabe's avatar
    Revert ""Reland x3 [arraybuffer] Rearchitect backing store ownership"" · 195679de
    Francis McCabe authored
    This reverts commit df8e6177.
    
    Reason for revert: Multiple flakes in apparently related areas:
    
    https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8906409837768155568/+/steps/Check__flakes_/0/logs/BackingStoreTest.RacyGrowWasmMem.../0
    
    Original change's description:
    > "Reland x3 [arraybuffer] Rearchitect backing store ownership"
    > 
    > This is a reland of bc33f5ae
    > 
    > 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.
    > 
    > R=​mlippautz@chromium.org
    > BUG=v8:9380,v8:9221,chromium:986318
    > TBR=ulan@chromium.org
    > 
    > Change-Id: I6c49e2425029b5664ef1c68dab8b5146f4ed0ff2
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1719191
    > Reviewed-by: Ben Titzer <titzer@chromium.org>
    > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > Commit-Queue: Ben Titzer <titzer@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#63007}
    
    TBR=mstarzinger@chromium.org,titzer@chromium.org,mlippautz@chromium.org
    
    Change-Id: If0266e5893b1325a332d5986337fa7ece2cb6943
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: v8:9380, v8:9221, chromium:986318
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1729549Reviewed-by: 's avatarFrancis McCabe <fgm@chromium.org>
    Commit-Queue: Francis McCabe <fgm@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63011}
    195679de
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