• Ben L. Titzer's avatar
    [wasm] Improve patching behavior for lazy compilation · ff64dfa0
    Ben L. Titzer authored
    This CL fixes the pathological O(n^2) patching behavior that
    was introduced when simplifying the wasm instance/context data
    structures. It introduces a per-instance reverse mapping of
    function indexes to where they appear in import and indirect
    function tables. The mapping is created lazily and rebuild in
    response to too many failed lookups, which makes it robust
    to table mutations in the future.
    
    This CL also fixes a bug where the anonymous lazy compile stub
    was not being used for direct calls, confusing the indirect
    call patching mechanism.
    
    R=clemensh@chromium.org,mstarzinger@chromium.org
    
    Bug: v8:7424, chromium:830558
    Change-Id: Ice0212593b31eb64687a3d52bd238020682a857f
    Reviewed-on: https://chromium-review.googlesource.com/1004294
    Commit-Queue: Ben Titzer <titzer@chromium.org>
    Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#52526}
    ff64dfa0
wasm-code-specialization.cc 8.3 KB