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/ADT/StringMap.h"
19#include "llvm/ADT/ValueMap.h"
20#include "llvm/CodeGen/MachineFrameInfo.h"
21#include "llvm/CodeGen/MachineFunction.h"
22#include "llvm/CodeGen/MachineMemOperand.h"
23#include "llvm/CodeGen/PseudoSourceValue.h"
24#include "llvm/IR/GlobalValue.h"
25#include "llvm/Target/TargetFrameLowering.h"
26#include "llvm/Target/TargetMachine.h"
27#include <utility>
28
29namespace llvm {
30
31/// \brief A class derived from PseudoSourceValue that represents a GOT entry
32/// resolved by lazy-binding.
33class MipsCallEntry : public PseudoSourceValue {
34public:
35  explicit MipsCallEntry(const StringRef &N);
36  explicit MipsCallEntry(const GlobalValue *V);
37  virtual bool isConstant(const MachineFrameInfo *) const;
38  virtual bool isAliased(const MachineFrameInfo *) const;
39  virtual bool mayAlias(const MachineFrameInfo *) const;
40
41private:
42  virtual void printCustom(raw_ostream &O) const;
43#ifndef NDEBUG
44  std::string Name;
45  const GlobalValue *Val;
46#endif
47};
48
49/// MipsFunctionInfo - This class is derived from MachineFunction private
50/// Mips target-specific information for each MachineFunction.
51class MipsFunctionInfo : public MachineFunctionInfo {
52public:
53  MipsFunctionInfo(MachineFunction& MF)
54   : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
55     VarArgsFrameIndex(0), CallsEhReturn(false)
56  {}
57
58  ~MipsFunctionInfo();
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  bool hasByvalArg() const { return HasByvalArg; }
73  void setFormalArgInfo(unsigned Size, bool HasByval) {
74    IncomingArgSize = Size;
75    HasByvalArg = HasByval;
76  }
77
78  unsigned getIncomingArgSize() const { return IncomingArgSize; }
79
80  bool callsEhReturn() const { return CallsEhReturn; }
81  void setCallsEhReturn() { CallsEhReturn = true; }
82
83  void createEhDataRegsFI();
84  int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
85  bool isEhDataRegFI(int FI) const;
86
87  /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
88  /// representing a GOT entry for an external function.
89  MachinePointerInfo callPtrInfo(const StringRef &Name);
90
91  /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
92  /// representing a GOT entry for a global function.
93  MachinePointerInfo callPtrInfo(const GlobalValue *Val);
94
95private:
96  virtual void anchor();
97
98  MachineFunction& MF;
99  /// SRetReturnReg - Some subtargets require that sret lowering includes
100  /// returning the value of the returned struct in a register. This field
101  /// holds the virtual register into which the sret argument is passed.
102  unsigned SRetReturnReg;
103
104  /// GlobalBaseReg - keeps track of the virtual register initialized for
105  /// use as the global base register. This is used for PIC in some PIC
106  /// relocation models.
107  unsigned GlobalBaseReg;
108
109  /// Mips16SPAliasReg - keeps track of the virtual register initialized for
110  /// use as an alias for SP for use in load/store of halfword/byte from/to
111  /// the stack
112  unsigned Mips16SPAliasReg;
113
114  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
115  int VarArgsFrameIndex;
116
117  /// True if function has a byval argument.
118  bool HasByvalArg;
119
120  /// Size of incoming argument area.
121  unsigned IncomingArgSize;
122
123  /// CallsEhReturn - Whether the function calls llvm.eh.return.
124  bool CallsEhReturn;
125
126  /// Frame objects for spilling eh data registers.
127  int EhDataRegFI[4];
128
129  /// MipsCallEntry maps.
130  StringMap<const MipsCallEntry *> ExternalCallEntries;
131  ValueMap<const GlobalValue *, const MipsCallEntry *> GlobalCallEntries;
132};
133
134} // end of namespace llvm
135
136#endif // MIPS_MACHINE_FUNCTION_INFO_H
137