• Mythri A's avatar
    Reland "[sparkplug] Support bytecode / baseline code flushing with sparkplug" · 3ae733f9
    Mythri A authored
    This is a reland of ea55438a. Relanding
    after a fix lands here:
    https://chromium-review.googlesource.com/c/v8/v8/+/3030711. The failures
    were caused because baseline code could be flushed during the process
    of deoptimization after we choose which entry (InterpreterEnterAt* /
    BaselineEnterAt* ) builtin to use. BaselineEnterAt* builtins expect
    baseline code but it could be flushed before we execute the builtin. The
    fix is to defer the decision.
    
    Original change's description:
    > [sparkplug] Support bytecode / baseline code flushing with sparkplug
    >
    > Currently with sparkplug we don't flush bytecode / baseline code of
    > functions that were tiered up to sparkplug. This CL adds the support to
    > flush baseline code / bytecode of functions that have baseline code too.
    > This CL:
    > 1. Updates the BodyDescriptor of JSFunction to treat the Code field of
    > JSFunction as a custom weak pointer where the code is treated as weak if
    > the bytecode corresponding to this function is old.
    > 2. Updates GC to handle the functions that had a weak code object during
    > the atomic phase of GC.
    > 3. Updates the check for old bytecode to also consider when there is
    > baseline code on the function.
    >
    > This CL doesn't change any heuristics for flushing. The baseline code
    > will be flushed at the same time as bytecode.
    >
    > Change-Id: I6b51e06ebadb917b9f4b0f43f2afebd7f64cd26a
    > Bug: v8:11947
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2992715
    > Commit-Queue: Mythri Alle <mythria@chromium.org>
    > Reviewed-by: Andreas Haas <ahaas@chromium.org>
    > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
    > Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#75674}
    
    Bug: v8:11947
    Change-Id: I63dce4cd9f6271c54049cc09f95d12e2795f15d1
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3035774Reviewed-by: 's avatarDominik Inführ <dinfuehr@chromium.org>
    Reviewed-by: 's avatarAndreas Haas <ahaas@chromium.org>
    Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Commit-Queue: Mythri Alle <mythria@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#75810}
    3ae733f9
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