Home | History | Annotate | Download | only in Mips 
      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:
     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 
     42   unsigned getSRetReturnReg() const { return SRetReturnReg; }
     43   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
     44 
     45   bool globalBaseRegSet() const;
     46   unsigned getGlobalBaseReg();
     47 
     48   bool mips16SPAliasRegSet() const;
     49   unsigned getMips16SPAliasReg();
     50 
     51   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
     52   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
     53 
     54   bool hasByvalArg() const { return HasByvalArg; }
     55   void setFormalArgInfo(unsigned Size, bool HasByval) {
     56     IncomingArgSize = Size;
     57     HasByvalArg = HasByval;
     58   }
     59 
     60   unsigned getIncomingArgSize() const { return IncomingArgSize; }
     61 
     62   bool callsEhReturn() const { return CallsEhReturn; }
     63   void setCallsEhReturn() { CallsEhReturn = true; }
     64 
     65   void createEhDataRegsFI();
     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.
     75   bool isISR() const { return IsISR; }
     76   void setISR() { IsISR = true; }
     77   void createISRRegFI();
     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 
     85   void setSaveS2() { SaveS2 = true; }
     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