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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/ADT/StringMap.h"
     19 #include "llvm/CodeGen/MachineFrameInfo.h"
     20 #include "llvm/CodeGen/MachineFunction.h"
     21 #include "llvm/CodeGen/MachineMemOperand.h"
     22 #include "llvm/CodeGen/PseudoSourceValue.h"
     23 #include "llvm/IR/GlobalValue.h"
     24 #include "llvm/IR/ValueMap.h"
     25 #include "llvm/Target/TargetFrameLowering.h"
     26 #include "llvm/Target/TargetMachine.h"
     27 #include <map>
     28 #include <string>
     29 #include <utility>
     30 
     31 namespace llvm {
     32 
     33 /// \brief A class derived from PseudoSourceValue that represents a GOT entry
     34 /// resolved by lazy-binding.
     35 class MipsCallEntry : public PseudoSourceValue {
     36 public:
     37   explicit MipsCallEntry(StringRef N);
     38   explicit MipsCallEntry(const GlobalValue *V);
     39   bool isConstant(const MachineFrameInfo *) const override;
     40   bool isAliased(const MachineFrameInfo *) const override;
     41   bool mayAlias(const MachineFrameInfo *) const override;
     42 
     43 private:
     44   void printCustom(raw_ostream &O) const override;
     45 #ifndef NDEBUG
     46   std::string Name;
     47   const GlobalValue *Val;
     48 #endif
     49 };
     50 
     51 /// MipsFunctionInfo - This class is derived from MachineFunction private
     52 /// Mips target-specific information for each MachineFunction.
     53 class MipsFunctionInfo : public MachineFunctionInfo {
     54 public:
     55   MipsFunctionInfo(MachineFunction &MF)
     56       : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
     57         VarArgsFrameIndex(0), CallsEhReturn(false), SaveS2(false),
     58         MoveF64ViaSpillFI(-1) {}
     59 
     60   ~MipsFunctionInfo();
     61 
     62   unsigned getSRetReturnReg() const { return SRetReturnReg; }
     63   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
     64 
     65   bool globalBaseRegSet() const;
     66   unsigned getGlobalBaseReg();
     67 
     68   bool mips16SPAliasRegSet() const;
     69   unsigned getMips16SPAliasReg();
     70 
     71   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
     72   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
     73 
     74   bool hasByvalArg() const { return HasByvalArg; }
     75   void setFormalArgInfo(unsigned Size, bool HasByval) {
     76     IncomingArgSize = Size;
     77     HasByvalArg = HasByval;
     78   }
     79 
     80   unsigned getIncomingArgSize() const { return IncomingArgSize; }
     81 
     82   bool callsEhReturn() const { return CallsEhReturn; }
     83   void setCallsEhReturn() { CallsEhReturn = true; }
     84 
     85   void createEhDataRegsFI();
     86   int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
     87   bool isEhDataRegFI(int FI) const;
     88 
     89   /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
     90   /// representing a GOT entry for an external function.
     91   MachinePointerInfo callPtrInfo(StringRef Name);
     92 
     93   /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
     94   /// representing a GOT entry for a global function.
     95   MachinePointerInfo callPtrInfo(const GlobalValue *Val);
     96 
     97   void setSaveS2() { SaveS2 = true; }
     98   bool hasSaveS2() const { return SaveS2; }
     99 
    100   int getMoveF64ViaSpillFI(const TargetRegisterClass *RC);
    101 
    102   std::map<const char *, const llvm::Mips16HardFloatInfo::FuncSignature *>
    103   StubsNeeded;
    104 
    105 private:
    106   virtual void anchor();
    107 
    108   MachineFunction& MF;
    109   /// SRetReturnReg - Some subtargets require that sret lowering includes
    110   /// returning the value of the returned struct in a register. This field
    111   /// holds the virtual register into which the sret argument is passed.
    112   unsigned SRetReturnReg;
    113 
    114   /// GlobalBaseReg - keeps track of the virtual register initialized for
    115   /// use as the global base register. This is used for PIC in some PIC
    116   /// relocation models.
    117   unsigned GlobalBaseReg;
    118 
    119   /// Mips16SPAliasReg - keeps track of the virtual register initialized for
    120   /// use as an alias for SP for use in load/store of halfword/byte from/to
    121   /// the stack
    122   unsigned Mips16SPAliasReg;
    123 
    124   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
    125   int VarArgsFrameIndex;
    126 
    127   /// True if function has a byval argument.
    128   bool HasByvalArg;
    129 
    130   /// Size of incoming argument area.
    131   unsigned IncomingArgSize;
    132 
    133   /// CallsEhReturn - Whether the function calls llvm.eh.return.
    134   bool CallsEhReturn;
    135 
    136   /// Frame objects for spilling eh data registers.
    137   int EhDataRegFI[4];
    138 
    139   // saveS2
    140   bool SaveS2;
    141 
    142   /// FrameIndex for expanding BuildPairF64 nodes to spill and reload when the
    143   /// O32 FPXX ABI is enabled. -1 is used to denote invalid index.
    144   int MoveF64ViaSpillFI;
    145 
    146   /// MipsCallEntry maps.
    147   StringMap<std::unique_ptr<const MipsCallEntry>> ExternalCallEntries;
    148   ValueMap<const GlobalValue *, std::unique_ptr<const MipsCallEntry>>
    149       GlobalCallEntries;
    150 };
    151 
    152 } // end of namespace llvm
    153 
    154 #endif
    155