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