Home | History | Annotate | Line # | Download | only in SystemZ 
      1 //=== SystemZMachineFunctionInfo.h - SystemZ machine function info -*- C++ -*-//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 
      9 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
     10 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
     11 
     12 #include "llvm/CodeGen/MachineFunction.h"
     13 
     14 namespace llvm {
     15 
     16 namespace SystemZ {
     17 // A struct to hold the low and high GPR registers to be saved/restored as
     18 // well as the offset into the register save area of the low register.
     19 struct GPRRegs {
     20   unsigned LowGPR;
     21   unsigned HighGPR;
     22   unsigned GPROffset;
     23   GPRRegs() : LowGPR(0), HighGPR(0), GPROffset(0) {}
     24   };
     25 }
     26 
     27 class SystemZMachineFunctionInfo : public MachineFunctionInfo {
     28   virtual void anchor();
     29 
     30   SystemZ::GPRRegs SpillGPRRegs;
     31   SystemZ::GPRRegs RestoreGPRRegs;
     32   Register VarArgsFirstGPR;
     33   Register VarArgsFirstFPR;
     34   unsigned VarArgsFrameIndex;
     35   unsigned RegSaveFrameIndex;
     36   int FramePointerSaveIndex;
     37   bool ManipulatesSP;
     38   unsigned NumLocalDynamics;
     39 
     40 public:
     41   explicit SystemZMachineFunctionInfo(MachineFunction &MF)
     42     : VarArgsFirstGPR(0), VarArgsFirstFPR(0), VarArgsFrameIndex(0),
     43       RegSaveFrameIndex(0), FramePointerSaveIndex(0), ManipulatesSP(false),
     44       NumLocalDynamics(0) {}
     45 
     46   // Get and set the first and last call-saved GPR that should be saved by
     47   // this function and the SP offset for the STMG.  These are 0 if no GPRs
     48   // need to be saved or restored.
     49   SystemZ::GPRRegs getSpillGPRRegs() const { return SpillGPRRegs; }
     50   void setSpillGPRRegs(Register Low, Register High, unsigned Offs) {
     51     SpillGPRRegs.LowGPR = Low;
     52     SpillGPRRegs.HighGPR = High;
     53     SpillGPRRegs.GPROffset = Offs;
     54   }
     55 
     56   // Get and set the first and last call-saved GPR that should be restored by
     57   // this function and the SP offset for the LMG.  These are 0 if no GPRs
     58   // need to be saved or restored.
     59   SystemZ::GPRRegs getRestoreGPRRegs() const { return RestoreGPRRegs; }
     60   void setRestoreGPRRegs(Register Low, Register High, unsigned Offs) {
     61     RestoreGPRRegs.LowGPR = Low;
     62     RestoreGPRRegs.HighGPR = High;
     63     RestoreGPRRegs.GPROffset = Offs;
     64   }
     65 
     66   // Get and set the number of fixed (as opposed to variable) arguments
     67   // that are passed in GPRs to this function.
     68   Register getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
     69   void setVarArgsFirstGPR(Register GPR) { VarArgsFirstGPR = GPR; }
     70 
     71   // Likewise FPRs.
     72   Register getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
     73   void setVarArgsFirstFPR(Register FPR) { VarArgsFirstFPR = FPR; }
     74 
     75   // Get and set the frame index of the first stack vararg.
     76   unsigned getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
     77   void setVarArgsFrameIndex(unsigned FI) { VarArgsFrameIndex = FI; }
     78 
     79   // Get and set the frame index of the register save area
     80   // (i.e. the incoming stack pointer).
     81   unsigned getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
     82   void setRegSaveFrameIndex(unsigned FI) { RegSaveFrameIndex = FI; }
     83 
     84   // Get and set the frame index of where the old frame pointer is stored.
     85   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
     86   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
     87 
     88   // Get and set whether the function directly manipulates the stack pointer,
     89   // e.g. through STACKSAVE or STACKRESTORE.
     90   bool getManipulatesSP() const { return ManipulatesSP; }
     91   void setManipulatesSP(bool MSP) { ManipulatesSP = MSP; }
     92 
     93   // Count number of local-dynamic TLS symbols used.
     94   unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
     95   void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
     96 };
     97 
     98 } // end namespace llvm
     99 
    100 #endif
    101