MipsMachineFunction.h revision f15f49850768f5889c2e12aeb273e158597a1223 
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 <utility>
18#include "llvm/ADT/SmallVector.h"
19#include "llvm/ADT/VectorExtras.h"
20#include "llvm/CodeGen/MachineFunction.h"
21#include "llvm/CodeGen/MachineFrameInfo.h"
22
23namespace llvm {
24
25/// MipsFunctionInfo - This class is derived from MachineFunction private
26/// Mips target-specific information for each MachineFunction.
27class MipsFunctionInfo : public MachineFunctionInfo {
28
29private:
30  /// SRetReturnReg - Some subtargets require that sret lowering includes
31  /// returning the value of the returned struct in a register. This field
32  /// holds the virtual register into which the sret argument is passed.
33  unsigned SRetReturnReg;
34
35  /// GlobalBaseReg - keeps track of the virtual register initialized for
36  /// use as the global base register. This is used for PIC in some PIC
37  /// relocation models.
38  unsigned GlobalBaseReg;
39
40  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
41  int VarArgsFrameIndex;
42
43  // Range of frame object indices.
44  // InArgFIRange: Range of indices of all frame objects created during call to
45  //               LowerFormalArguments.
46  // OutArgFIRange: Range of indices of all frame objects created during call to
47  //                LowerCall except for the frame object for restoring $gp.
48  std::pair<int, int> InArgFIRange, OutArgFIRange;
49  int GPFI; // Index of the frame object for restoring $gp
50  bool HasCall; // True if function has a function call.
51  unsigned MaxCallFrameSize;
52public:
53  MipsFunctionInfo(MachineFunction& MF)
54  : SRetReturnReg(0), GlobalBaseReg(0),
55    VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
56    OutArgFIRange(std::make_pair(-1, 0)), GPFI(0), HasCall(false),
57    MaxCallFrameSize(0)
58  {}
59
60  bool isInArgFI(int FI) const {
61    return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
62  }
63  void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
64
65  bool isOutArgFI(int FI) const {
66    return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
67  }
68  void extendOutArgFIRange(int FirstFI, int LastFI) {
69    if (!OutArgFIRange.second)
70      // this must be the first time this function was called.
71      OutArgFIRange.first = FirstFI;
72    OutArgFIRange.second = LastFI;
73  }
74
75  int getGPFI() const { return GPFI; }
76  void setGPFI(int FI) { GPFI = FI; }
77  bool needGPSaveRestore() const { return getGPFI(); }
78  bool isGPFI(int FI) const { return GPFI && GPFI == FI; }
79
80  unsigned getSRetReturnReg() const { return SRetReturnReg; }
81  void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
82
83  unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
84  void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
85
86  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
87  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
88
89  bool hasCall() const { return HasCall; }
90  void setHasCall() { HasCall = true; }
91
92  unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
93  void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
94};
95
96} // end of namespace llvm
97
98#endif // MIPS_MACHINE_FUNCTION_INFO_H
99