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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 MIPS_MACHINE_FUNCTION_INFO_H
     15 #define MIPS_MACHINE_FUNCTION_INFO_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(const 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 
     59   ~MipsFunctionInfo();
     60 
     61   unsigned getSRetReturnReg() const { return SRetReturnReg; }
     62   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
     63 
     64   bool globalBaseRegSet() const;
     65   unsigned getGlobalBaseReg();
     66 
     67   bool mips16SPAliasRegSet() const;
     68   unsigned getMips16SPAliasReg();
     69 
     70   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
     71   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
     72 
     73   bool hasByvalArg() const { return HasByvalArg; }
     74   void setFormalArgInfo(unsigned Size, bool HasByval) {
     75     IncomingArgSize = Size;
     76     HasByvalArg = HasByval;
     77   }
     78 
     79   unsigned getIncomingArgSize() const { return IncomingArgSize; }
     80 
     81   bool callsEhReturn() const { return CallsEhReturn; }
     82   void setCallsEhReturn() { CallsEhReturn = true; }
     83 
     84   void createEhDataRegsFI();
     85   int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
     86   bool isEhDataRegFI(int FI) const;
     87 
     88   /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
     89   /// representing a GOT entry for an external function.
     90   MachinePointerInfo callPtrInfo(const StringRef &Name);
     91 
     92   /// \brief Create a MachinePointerInfo that has a MipsCallEntr object
     93   /// representing a GOT entry for a global function.
     94   MachinePointerInfo callPtrInfo(const GlobalValue *Val);
     95 
     96   void setSaveS2() { SaveS2 = true; }
     97   bool hasSaveS2() const { return SaveS2; }
     98 
     99   std::map<const char *, const llvm::Mips16HardFloatInfo::FuncSignature *>
    100   StubsNeeded;
    101 
    102 private:
    103   virtual void anchor();
    104 
    105   MachineFunction& MF;
    106   /// SRetReturnReg - Some subtargets require that sret lowering includes
    107   /// returning the value of the returned struct in a register. This field
    108   /// holds the virtual register into which the sret argument is passed.
    109   unsigned SRetReturnReg;
    110 
    111   /// GlobalBaseReg - keeps track of the virtual register initialized for
    112   /// use as the global base register. This is used for PIC in some PIC
    113   /// relocation models.
    114   unsigned GlobalBaseReg;
    115 
    116   /// Mips16SPAliasReg - keeps track of the virtual register initialized for
    117   /// use as an alias for SP for use in load/store of halfword/byte from/to
    118   /// the stack
    119   unsigned Mips16SPAliasReg;
    120 
    121   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
    122   int VarArgsFrameIndex;
    123 
    124   /// True if function has a byval argument.
    125   bool HasByvalArg;
    126 
    127   /// Size of incoming argument area.
    128   unsigned IncomingArgSize;
    129 
    130   /// CallsEhReturn - Whether the function calls llvm.eh.return.
    131   bool CallsEhReturn;
    132 
    133   /// Frame objects for spilling eh data registers.
    134   int EhDataRegFI[4];
    135 
    136   // saveS2
    137   bool SaveS2;
    138 
    139   /// MipsCallEntry maps.
    140   StringMap<const MipsCallEntry *> ExternalCallEntries;
    141   ValueMap<const GlobalValue *, const MipsCallEntry *> GlobalCallEntries;
    142 };
    143 
    144 } // end of namespace llvm
    145 
    146 #endif // MIPS_MACHINE_FUNCTION_INFO_H
    147