• Georg Neis's avatar
    [runtime] Fix reentrancy bug in JSFunction::EnsureHasInitialMap · 0817d7ee
    Georg Neis authored
    Foozie came up with a mind-boggling example hitting a similarly
    mind-boggling bug: object construction (JSObject::New) wants to create
    the constructor's function initial map (JSFunction::GetDerivedMap ->
    JSFunction::EnsureHasInitialMap). To do so, it calls
    JSFunction::CalculateExpectedNofProperties. This harmless sounding
    function triggers compilation of the function. Since we're running with
    --always-opt, this is an optimizing compilation. Turbofan ends up
    depending on the function's "prototype" property, for which it wants to
    create the initial map so that it can install the code dependency. That
    is, EnsureHasInitialMap is reentered. At this point there is no further
    compilation attempt because the bytecode now exists. The initial map is
    created and installed on the function, and TF records the code
    dependency on that map. When CalculateExpectedNofProperties returns
    control to the outer EnsureHasInitialMap, yet another initial map is
    created and set on the function, forgetting the previous one and thus
    the code dependency.
    
    I'm not sure if this bug can only be observed with --always-opt. The fix
    is general.
    
    Bug: chromium:1092011
    Change-Id: I8b972748e49b9eb8f06fa17ea9ca037de2bd7532
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2238570Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
    Commit-Queue: Georg Neis <neis@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#68292}
    0817d7ee
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