• Anton Bikineev's avatar
    Handles: Fix OnStackTracedNodeSpace with -fsanitize=safe-stack · c7fbac6a
    Anton Bikineev authored
    When the stack is split in safe and unsafe parts, on-stack
    TracedReferences are allocated on the unsafe stack. What currently
    happens is that on GC we destroy all the on-stack references below the
    current frame of the *safe* stack. If the safe stack is allocated above
    the unsafe counterpart, then all the traced references will be
    preliminary destructed on GC. This CL fixes it by using
    __builtin___get_unsafe_stack_ptr() if -fsanitize=safe-stack is enabled.
    
    In addition, deduplicate OnStackTracedNodeSpace::IsOnStack() and
    Stack::IsOnStack() and move more logic into ::heap::base::Stack.
    
    Bug: chromium:1278780
    Change-Id: I9582bb1321958b7ec8ef2c0c46b9e42d51bb6f94
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3395033Reviewed-by: 's avatarMichael Lippautz <mlippautz@chromium.org>
    Commit-Queue: Anton Bikineev <bikineev@chromium.org>
    Auto-Submit: Anton Bikineev <bikineev@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#78660}
    c7fbac6a
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