text: //=== SystemZMachineFunctionInfo.h - SystemZ machine function info -*- C++ -*-//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
  #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
  
  #include "llvm/CodeGen/MachineFunction.h"
  
  namespace llvm {
  
  namespace SystemZ {
  // A struct to hold the low and high GPR registers to be saved/restored as
  // well as the offset into the register save area of the low register.
  struct GPRRegs {
    unsigned LowGPR;
    unsigned HighGPR;
    unsigned GPROffset;
    GPRRegs() : LowGPR(0), HighGPR(0), GPROffset(0) {}
    };
  }
  
  class SystemZMachineFunctionInfo : public MachineFunctionInfo {
    virtual void anchor();
  
    SystemZ::GPRRegs SpillGPRRegs;
    SystemZ::GPRRegs RestoreGPRRegs;
    unsigned VarArgsFirstGPR;
    unsigned VarArgsFirstFPR;
    unsigned VarArgsFrameIndex;
    unsigned RegSaveFrameIndex;
    int FramePointerSaveIndex;
    bool ManipulatesSP;
    unsigned NumLocalDynamics;
  
  public:
    explicit SystemZMachineFunctionInfo(MachineFunction &MF)
      : VarArgsFirstGPR(0), VarArgsFirstFPR(0), VarArgsFrameIndex(0),
        RegSaveFrameIndex(0), FramePointerSaveIndex(0), ManipulatesSP(false),
        NumLocalDynamics(0) {}
  
    // Get and set the first and last call-saved GPR that should be saved by
    // this function and the SP offset for the STMG.  These are 0 if no GPRs
    // need to be saved or restored.
    SystemZ::GPRRegs getSpillGPRRegs() const { return SpillGPRRegs; }
    void setSpillGPRRegs(unsigned Low, unsigned High, unsigned Offs) {
      SpillGPRRegs.LowGPR = Low;
      SpillGPRRegs.HighGPR = High;
      SpillGPRRegs.GPROffset = Offs;
    }
  
    // Get and set the first and last call-saved GPR that should be restored by
    // this function and the SP offset for the LMG.  These are 0 if no GPRs
    // need to be saved or restored.
    SystemZ::GPRRegs getRestoreGPRRegs() const { return RestoreGPRRegs; }
    void setRestoreGPRRegs(unsigned Low, unsigned High, unsigned Offs) {
      RestoreGPRRegs.LowGPR = Low;
      RestoreGPRRegs.HighGPR = High;
      RestoreGPRRegs.GPROffset = Offs;
    }
  
    // Get and set the number of fixed (as opposed to variable) arguments
    // that are passed in GPRs to this function.
    unsigned getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
    void setVarArgsFirstGPR(unsigned GPR) { VarArgsFirstGPR = GPR; }
  
    // Likewise FPRs.
    unsigned getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
    void setVarArgsFirstFPR(unsigned FPR) { VarArgsFirstFPR = FPR; }
  
    // Get and set the frame index of the first stack vararg.
    unsigned getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
    void setVarArgsFrameIndex(unsigned FI) { VarArgsFrameIndex = FI; }
  
    // Get and set the frame index of the register save area
    // (i.e. the incoming stack pointer).
    unsigned getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
    void setRegSaveFrameIndex(unsigned FI) { RegSaveFrameIndex = FI; }
  
    // Get and set the frame index of where the old frame pointer is stored.
    int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
    void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
  
    // Get and set whether the function directly manipulates the stack pointer,
    // e.g. through STACKSAVE or STACKRESTORE.
    bool getManipulatesSP() const { return ManipulatesSP; }
    void setManipulatesSP(bool MSP) { ManipulatesSP = MSP; }
  
    // Count number of local-dynamic TLS symbols used.
    unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
    void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
  };
  
  } // end namespace llvm
  
  #endif
  