• Jakob Gruber's avatar
    [deoptimizer] Extract frame layout calculation into helper classes · 81642fa6
    Jakob Gruber authored
    The deoptimizer calculates frame layout based on the translation's
    `height` field, together with additional data (e.g.: are we looking at
    the topmost frame? what kind of deopt are we in?). The result is the
    final deoptimized frame size in bytes, together with a bunch of
    intermediate results such as the variable frame size (= without the
    fixed-size portion).
    
    In order to consider the deoptimized frame size in optimized stack
    checks, we will need to calculate the frame layout during compilation
    in addition to what we currently do during deoptimization. This CL
    moves in that direction by extracting relevant parts of frame layout
    calculation into classes that can be reused by both compiler and
    deoptimizer.
    
    These helpers will support both precise and conservative modes; the
    deoptimizer will use the precise mode (since it has full information),
    while the instruction selector will use the conservative mode.
    
    Bug: v8:9534
    Change-Id: I93d6c39f10d251733f4625d3cc161b2010652d02
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1760825
    Commit-Queue: Jakob Gruber <jgruber@chromium.org>
    Reviewed-by: 's avatarSigurd Schneider <sigurds@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63279}
    81642fa6
deoptimizer.h 35.1 KB