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