• zhengxing.li's avatar
    X87: [turbofan] Add general support for sp-based frame access. · 240571d7
    zhengxing.li authored
      port 51669873 (r32234)
    
      original commit message:
      Some highlights of this CL:
      * Refactor the mutable state out of Frame into FrameAccessState,
        which is maintained and updated during code generation to
        record whether sp- or fp-based frame access is currently active
        and how deep the stack on top of the frame is.
      * The operand resultion in linkage.cc now uses FrameAccessState
        to determine how to generate frame-accessing operands.
      * Update all platforms to accurately track additionally pushed
        stack slots (e.g. arguments for calls) in the FrameAccessState.
      * Add a flag, --turbo_sp_frame_access, which forces all frame
        access to be sp-based whenever possible. This will likely never
        be used in production, but for testing it's useful in verifying
        that the stack-tracking of each platform maintained in the
        FrameAccessState is correct.
      * Use sp-based frame access for gap resolving before tail
        calls. This will allow for slightly more efficient restoration
        of the frame pointer in the tail call in a later CL.
      * Remove most ad hoc groping into CallDescriptors to
        determine if a frame is needed, instead consistently use
        predicates like needs_frame(), IsCFunctionCall() and
        IsJSFunctionCall().
    
    BUG=
    
    Review URL: https://codereview.chromium.org/1479483002
    
    Cr-Commit-Position: refs/heads/master@{#32253}
    240571d7
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