lib/Target/Mips/MipsMachineFunction.h

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