• Ben L. Titzer's avatar
    Reland "Reland "[arraybuffer] Rearchitect backing store ownership"" · 306cf403
    Ben L. Titzer authored
    This is a reland of bc33f5ae
    
    Original change's description:
    > Reland "[arraybuffer] Rearchitect backing store ownership"
    > 
    > This is a reland of 31cd5d83
    > 
    > 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
    > > 
    > > Change-Id: I48fae5ac85dcf6172a83f252439e77e7c1a16ccd
    > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1584323
    > > Commit-Queue: Ben Titzer <titzer@chromium.org>
    > > Reviewed-by: Ben Titzer <titzer@chromium.org>
    > > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > > Reviewed-by: Yang Guo <yangguo@chromium.org>
    > > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
    > > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    > > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    > > Cr-Commit-Position: refs/heads/master@{#62572}
    > 
    > Bug: v8:9380, v8:9221
    > Change-Id: If3f72967a8ebeb067c0edcfc16ed631e36829dbc
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1691906
    > Commit-Queue: Ben Titzer <titzer@chromium.org>
    > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
    > Reviewed-by: Yang Guo <yangguo@chromium.org>
    > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#62809}
    
    Bug: v8:9380, v8:9221
    Change-Id: I9a2525753ae2424108d074fa81df5f25d945c824
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1709409
    Commit-Queue: Ben Titzer <titzer@chromium.org>
    Reviewed-by: 's avatarYang Guo <yangguo@chromium.org>
    Reviewed-by: 's avatarMichael Lippautz <mlippautz@chromium.org>
    Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
    Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#62847}
    306cf403
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