SystemZMachineFunctionInfo.h revision 360784 
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
14namespace llvm {
15
16namespace 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.
19struct GPRRegs {
20  unsigned LowGPR;
21  unsigned HighGPR;
22  unsigned GPROffset;
23  GPRRegs() : LowGPR(0), HighGPR(0), GPROffset(0) {}
24  };
25}
26
27class SystemZMachineFunctionInfo : public MachineFunctionInfo {
28  virtual void anchor();
29
30  SystemZ::GPRRegs SpillGPRRegs;
31  SystemZ::GPRRegs RestoreGPRRegs;
32  unsigned VarArgsFirstGPR;
33  unsigned VarArgsFirstFPR;
34  unsigned VarArgsFrameIndex;
35  unsigned RegSaveFrameIndex;
36  int FramePointerSaveIndex;
37  bool ManipulatesSP;
38  unsigned NumLocalDynamics;
39
40public:
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(unsigned Low, unsigned 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(unsigned Low, unsigned 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  unsigned getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
69  void setVarArgsFirstGPR(unsigned GPR) { VarArgsFirstGPR = GPR; }
70
71  // Likewise FPRs.
72  unsigned getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
73  void setVarArgsFirstFPR(unsigned 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