• Omer Katz's avatar
    cppgc: Allow allocations in prefinalziers · 2a7bfabf
    Omer Katz authored
    Prefinalizers have long been forbidden to allocate.
    This restriction often proved problematic and has caused several
    issues in the past.
    
    This CL adds support for allowing allocations in prefinalizers.
    At the start of prefinalizer invocations we clear the linear
    allocation buffers, such that all allocations go through the slow
    path for allocation. The slow path checks whether prefinalizers
    are currently being invoked and marks the newly allocated object
    if they are (i.e. black allocation during prefinalizers).
    
    The new behavior is disabled by default and can be enabled by
    setting the cppgc_allow_allocations_in_prefinalizers gn arg to true.
    
    Bug: chromium:1056170
    Change-Id: Ib86e780dcff88fa7b0f762ac2ab83c42393d33af
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3097877
    Commit-Queue: Omer Katz <omerkatz@chromium.org>
    Reviewed-by: 's avatarMichael Lippautz <mlippautz@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#76606}
    2a7bfabf
BUILD.gn 215 KB