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 
29 namespace llvm {
30 
31 /// MipsFunctionInfo - This class is derived from MachineFunction private
32 /// Mips target-specific information for each MachineFunction.
33 class MipsFunctionInfo : public MachineFunctionInfo {
34 public:
MipsFunctionInfo(MachineFunction & MF)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 
getSRetReturnReg()42   unsigned getSRetReturnReg() const { return SRetReturnReg; }
setSRetReturnReg(unsigned Reg)43   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
44 
45   bool globalBaseRegSet() const;
46   unsigned getGlobalBaseReg();
47 
48   bool mips16SPAliasRegSet() const;
49   unsigned getMips16SPAliasReg();
50 
getVarArgsFrameIndex()51   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
setVarArgsFrameIndex(int Index)52   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
53 
hasByvalArg()54   bool hasByvalArg() const { return HasByvalArg; }
setFormalArgInfo(unsigned Size,bool HasByval)55   void setFormalArgInfo(unsigned Size, bool HasByval) {
56     IncomingArgSize = Size;
57     HasByvalArg = HasByval;
58   }
59 
getIncomingArgSize()60   unsigned getIncomingArgSize() const { return IncomingArgSize; }
61 
callsEhReturn()62   bool callsEhReturn() const { return CallsEhReturn; }
setCallsEhReturn()63   void setCallsEhReturn() { CallsEhReturn = true; }
64 
65   void createEhDataRegsFI();
getEhDataRegFI(unsigned Reg)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.
isISR()75   bool isISR() const { return IsISR; }
setISR()76   void setISR() { IsISR = true; }
77   void createISRRegFI();
getISRRegFI(unsigned Reg)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 
setSaveS2()85   void setSaveS2() { SaveS2 = true; }
hasSaveS2()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 
93 private:
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