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    • Anton Bikineev's avatar
      cppgc: Conservatively scan compressed pointers · 51d2256b
      Anton Bikineev authored
      Due to collections with inlined storage, Oilpan still supports on-stack
      Members, which are always compressed if pointer compression is enabled.
      This CL scans halfwords (together with full words) on stack to find
      potential pointers. Since on-heap pointers can only be compressed and
      in-construction objects always reside on heap, only halfwords need to be
      scanned for them.
      
      The alternative potential followup approaches:
      1) Use a separate uncompressed type for pointer in inlined collections;
      2) Dynamically register regions of stack containing compressed pointers.
      
      Bug: chromium:1325007
      Change-Id: Ia706fd8e7383d30aff11f4014faa9edd3d289a55
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3644959Reviewed-by: 's avatarMichael Lippautz <mlippautz@chromium.org>
      Commit-Queue: Anton Bikineev <bikineev@chromium.org>
      Cr-Commit-Position: refs/heads/main@{#80747}
      51d2256b
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