MipsMachineFunction.h revision 173192fa71a45ee87479c0eb7753bf116bce36b8 
1//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the Mips specific subclass of MachineFunctionInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef MIPS_MACHINE_FUNCTION_INFO_H
15#define MIPS_MACHINE_FUNCTION_INFO_H
16
17#include "MipsSubtarget.h"
18#include "llvm/CodeGen/MachineFunction.h"
19#include "llvm/CodeGen/MachineFrameInfo.h"
20#include "llvm/Target/TargetFrameLowering.h"
21#include "llvm/Target/TargetMachine.h"
22#include <utility>
23
24namespace llvm {
25
26/// MipsFunctionInfo - This class is derived from MachineFunction private
27/// Mips target-specific information for each MachineFunction.
28class MipsFunctionInfo : public MachineFunctionInfo {
29  virtual void anchor();
30
31  MachineFunction& MF;
32  /// SRetReturnReg - Some subtargets require that sret lowering includes
33  /// returning the value of the returned struct in a register. This field
34  /// holds the virtual register into which the sret argument is passed.
35  unsigned SRetReturnReg;
36
37  /// GlobalBaseReg - keeps track of the virtual register initialized for
38  /// use as the global base register. This is used for PIC in some PIC
39  /// relocation models.
40  unsigned GlobalBaseReg;
41
42  /// Mips16SPAliasReg - keeps track of the virtual register initialized for
43  /// use as an alias for SP for use in load/store of halfword/byte from/to
44  /// the stack
45  unsigned Mips16SPAliasReg;
46
47  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
48  int VarArgsFrameIndex;
49
50  // Formal argument information obtained during call to LowerFormalArguments.
51  unsigned NextStackOffset;
52  bool HasByvalArg;
53
54public:
55  MipsFunctionInfo(MachineFunction& MF)
56   : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
57     VarArgsFrameIndex(0)
58  {}
59
60  unsigned getSRetReturnReg() const { return SRetReturnReg; }
61  void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
62
63  bool globalBaseRegSet() const;
64  unsigned getGlobalBaseReg();
65
66  bool mips16SPAliasRegSet() const;
67  unsigned getMips16SPAliasReg();
68
69  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
70  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
71
72  unsigned nextStackOffset() const { return NextStackOffset; }
73  bool hasByvalArg() const { return HasByvalArg; }
74  void setFormalArgInfo(unsigned Offset, bool HasByval) {
75    NextStackOffset = Offset;
76    HasByvalArg = HasByval;
77  }
78};
79
80} // end of namespace llvm
81
82#endif // MIPS_MACHINE_FUNCTION_INFO_H
83