• Victor Gomes's avatar
    Reland "[runtime] Refactor TransitionsAccessor" · 24ff6e28
    Victor Gomes authored
    This is a reland of c927ada7
    
    Fix: Recalculate encoding after an allocation (that can potentially
    trigger GC) in EnsureHasFullTransitionArray.
    
    Original change's description:
    > [runtime] Refactor TransitionsAccessor
    >
    > Problems:
    > - The class uses a bare Map field, but some methods can trigger GC
    > causing it to have a potential dangling pointer in case of map
    > compaction.
    > - Some methods invalidate the object state and should not be used again.
    > - Complicate logic with a no_gc and a gc aware constructors. Some
    > methods can only be called if the object is constructed with a
    > particular constructor (e.g, Insert and PutPrototypeTransition).
    >
    > Note: Most usages of this class is done by constructing an object and
    > calling a single method:
    > `TransitionAccessor(...).Method(...)`
    > So we can easily change them to a static method.
    >
    > This CL:
    > 1. Adds DISALLOW_GARBAGE_COLLECTION to the class.
    > 2. Makes methods that can trigger GC static.
    > 3. Creates static helper functions that wrap the class in a different
    > scope, since TransitionsAccessor now forces the scope to disallow gc.
    > 4. Removes now unnecessary "Reload" logic.
    >
    > Bug: chromium:1295133, v8:12578
    > Change-Id: I85484e7235fbd5e69894e26f5e1c491c6f69635e
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3450416
    > Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
    > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
    > Commit-Queue: Victor Gomes <victorgomes@chromium.org>
    > Cr-Commit-Position: refs/heads/main@{#79051}
    
    Bug: chromium:1295133, v8:12578
    Change-Id: If3880c2480433b78567870c8d14508d6ad9eccbd
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3460405Reviewed-by: 's avatarDominik Inführ <dinfuehr@chromium.org>
    Auto-Submit: Victor Gomes <victorgomes@chromium.org>
    Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Commit-Queue: Toon Verwaest <verwaest@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#79069}
    24ff6e28
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