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 LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H
15#define LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H
16
17#include "Mips16HardFloatInfo.h"
18#include "llvm/CodeGen/MachineFrameInfo.h"
19#include "llvm/CodeGen/MachineFunction.h"
20#include "llvm/CodeGen/MachineMemOperand.h"
21#include "llvm/CodeGen/PseudoSourceValue.h"
22#include "llvm/IR/ValueMap.h"
23#include "llvm/Target/TargetFrameLowering.h"
24#include "llvm/Target/TargetMachine.h"
25#include <map>
26#include <string>
27#include <utility>
28
29namespace llvm {
30
31/// MipsFunctionInfo - This class is derived from MachineFunction private
32/// Mips target-specific information for each MachineFunction.
33class MipsFunctionInfo : public MachineFunctionInfo {
34public:
35  MipsFunctionInfo(MachineFunction &MF)
36      : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
37        VarArgsFrameIndex(0), CallsEhReturn(false), IsISR(false), SaveS2(false),
38        MoveF64ViaSpillFI(-1) {}
39
40  ~MipsFunctionInfo();
41
42  unsigned getSRetReturnReg() const { return SRetReturnReg; }
43  void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
44
45  bool globalBaseRegSet() const;
46  unsigned getGlobalBaseReg();
47
48  bool mips16SPAliasRegSet() const;
49  unsigned getMips16SPAliasReg();
50
51  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
52  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
53
54  bool hasByvalArg() const { return HasByvalArg; }
55  void setFormalArgInfo(unsigned Size, bool HasByval) {
56    IncomingArgSize = Size;
57    HasByvalArg = HasByval;
58  }
59
60  unsigned getIncomingArgSize() const { return IncomingArgSize; }
61
62  bool callsEhReturn() const { return CallsEhReturn; }
63  void setCallsEhReturn() { CallsEhReturn = true; }
64
65  void createEhDataRegsFI();
66  int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
67  bool isEhDataRegFI(int FI) const;
68
69  /// Create a MachinePointerInfo that has an ExternalSymbolPseudoSourceValue
70  /// object representing a GOT entry for an external function.
71  MachinePointerInfo callPtrInfo(const char *ES);
72
73  // Functions with the "interrupt" attribute require special prologues,
74  // epilogues and additional spill slots.
75  bool isISR() const { return IsISR; }
76  void setISR() { IsISR = true; }
77  void createISRRegFI();
78  int getISRRegFI(unsigned Reg) const { return ISRDataRegFI[Reg]; }
79  bool isISRRegFI(int FI) const;
80
81  /// Create a MachinePointerInfo that has a GlobalValuePseudoSourceValue object
82  /// representing a GOT entry for a global function.
83  MachinePointerInfo callPtrInfo(const GlobalValue *GV);
84
85  void setSaveS2() { SaveS2 = true; }
86  bool hasSaveS2() const { return SaveS2; }
87
88  int getMoveF64ViaSpillFI(const TargetRegisterClass *RC);
89
90  std::map<const char *, const llvm::Mips16HardFloatInfo::FuncSignature *>
91  StubsNeeded;
92
93private:
94  virtual void anchor();
95
96  MachineFunction& MF;
97  /// SRetReturnReg - Some subtargets require that sret lowering includes
98  /// returning the value of the returned struct in a register. This field
99  /// holds the virtual register into which the sret argument is passed.
100  unsigned SRetReturnReg;
101
102  /// GlobalBaseReg - keeps track of the virtual register initialized for
103  /// use as the global base register. This is used for PIC in some PIC
104  /// relocation models.
105  unsigned GlobalBaseReg;
106
107  /// Mips16SPAliasReg - keeps track of the virtual register initialized for
108  /// use as an alias for SP for use in load/store of halfword/byte from/to
109  /// the stack
110  unsigned Mips16SPAliasReg;
111
112  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
113  int VarArgsFrameIndex;
114
115  /// True if function has a byval argument.
116  bool HasByvalArg;
117
118  /// Size of incoming argument area.
119  unsigned IncomingArgSize;
120
121  /// CallsEhReturn - Whether the function calls llvm.eh.return.
122  bool CallsEhReturn;
123
124  /// Frame objects for spilling eh data registers.
125  int EhDataRegFI[4];
126
127  /// ISR - Whether the function is an Interrupt Service Routine.
128  bool IsISR;
129
130  /// Frame objects for spilling C0_STATUS, C0_EPC
131  int ISRDataRegFI[2];
132
133  // saveS2
134  bool SaveS2;
135
136  /// FrameIndex for expanding BuildPairF64 nodes to spill and reload when the
137  /// O32 FPXX ABI is enabled. -1 is used to denote invalid index.
138  int MoveF64ViaSpillFI;
139};
140
141} // end of namespace llvm
142
143#endif
144