llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h

   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 = 0;
  21   unsigned HighGPR = 0;
  22   unsigned GPROffset = 0;
  23   GPRRegs() = default;
  24   };
  25 }
  26
  27 class SystemZMachineFunctionInfo : public MachineFunctionInfo {
  28   virtual void anchor();
  29
  30   /// Size of expected parameter area for current function. (Fixed args only).
  31   unsigned SizeOfFnParams;
  32
  33   SystemZ::GPRRegs SpillGPRRegs;
  34   SystemZ::GPRRegs RestoreGPRRegs;
  35   Register VarArgsFirstGPR;
  36   Register VarArgsFirstFPR;
  37   unsigned VarArgsFrameIndex;
  38   unsigned RegSaveFrameIndex;
  39   int FramePointerSaveIndex;
  40   unsigned NumLocalDynamics;
  41   /// z/OS XPLINK ABI: incoming ADA virtual register.
  42   Register VRegADA;
  43
  44 public:
  45   SystemZMachineFunctionInfo(const Function &F, const TargetSubtargetInfo *STI)
  46       : SizeOfFnParams(0), VarArgsFirstGPR(0), VarArgsFirstFPR(0),
  47         VarArgsFrameIndex(0), RegSaveFrameIndex(0), FramePointerSaveIndex(0),
  48         NumLocalDynamics(0) {}
  49
  50   MachineFunctionInfo *
  51   clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
  52         const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
  53       const override;
  54
  55   // z/OS: Get and set the size of the expected parameter area for the
  56   // current function. (ie. Size of param area in caller).
  57   unsigned getSizeOfFnParams() const { return SizeOfFnParams; }
  58   void setSizeOfFnParams(unsigned Size) { SizeOfFnParams = Size; }
  59
  60   // Get and set the first and last call-saved GPR that should be saved by
  61   // this function and the SP offset for the STMG.  These are 0 if no GPRs
  62   // need to be saved or restored.
  63   SystemZ::GPRRegs getSpillGPRRegs() const { return SpillGPRRegs; }
  64   void setSpillGPRRegs(Register Low, Register High, unsigned Offs) {
  65     SpillGPRRegs.LowGPR = Low;
  66     SpillGPRRegs.HighGPR = High;
  67     SpillGPRRegs.GPROffset = Offs;
  68   }
  69
  70   // Get and set the first and last call-saved GPR that should be restored by
  71   // this function and the SP offset for the LMG.  These are 0 if no GPRs
  72   // need to be saved or restored.
  73   SystemZ::GPRRegs getRestoreGPRRegs() const { return RestoreGPRRegs; }
  74   void setRestoreGPRRegs(Register Low, Register High, unsigned Offs) {
  75     RestoreGPRRegs.LowGPR = Low;
  76     RestoreGPRRegs.HighGPR = High;
  77     RestoreGPRRegs.GPROffset = Offs;
  78   }
  79
  80   // Get and set the number of fixed (as opposed to variable) arguments
  81   // that are passed in GPRs to this function.
  82   Register getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
  83   void setVarArgsFirstGPR(Register GPR) { VarArgsFirstGPR = GPR; }
  84
  85   // Likewise FPRs.
  86   Register getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
  87   void setVarArgsFirstFPR(Register FPR) { VarArgsFirstFPR = FPR; }
  88
  89   // Get and set the frame index of the first stack vararg.
  90   unsigned getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
  91   void setVarArgsFrameIndex(unsigned FI) { VarArgsFrameIndex = FI; }
  92
  93   // Get and set the frame index of the register save area
  94   // (i.e. the incoming stack pointer).
  95   unsigned getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
  96   void setRegSaveFrameIndex(unsigned FI) { RegSaveFrameIndex = FI; }
  97
  98   // Get and set the frame index of where the old frame pointer is stored.
  99   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
 100   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
 101
 102   // Count number of local-dynamic TLS symbols used.
 103   unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
 104   void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
 105
 106   // Get and set the function's incoming special XPLINK ABI defined ADA
 107   // register.
 108   Register getADAVirtualRegister() const { return VRegADA; }
 109   void setADAVirtualRegister(Register Reg) { VRegADA = Reg; }
 110 };
 111
 112 } // end namespace llvm
 113
 114 #endif