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      1 //===- MipsMachineFunctionInfo.h - Private data used for Mips ---*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This file declares the Mips specific subclass of MachineFunctionInfo.
     10 //
     11 //===----------------------------------------------------------------------===//
     12 
     13 #ifndef LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H
     14 #define LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H
     15 
     16 #include "Mips16HardFloatInfo.h"
     17 #include "llvm/CodeGen/MachineFunction.h"
     18 #include "llvm/CodeGen/MachineMemOperand.h"
     19 #include <map>
     20 
     21 namespace llvm {
     22 
     23 /// MipsFunctionInfo - This class is derived from MachineFunction private
     24 /// Mips target-specific information for each MachineFunction.
     25 class MipsFunctionInfo : public MachineFunctionInfo {
     26 public:
     27   MipsFunctionInfo(MachineFunction &MF) {}
     28 
     29   ~MipsFunctionInfo() override;
     30 
     31   unsigned getSRetReturnReg() const { return SRetReturnReg; }
     32   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
     33 
     34   bool globalBaseRegSet() const;
     35   Register getGlobalBaseReg(MachineFunction &MF);
     36   Register getGlobalBaseRegForGlobalISel(MachineFunction &MF);
     37 
     38   // Insert instructions to initialize the global base register in the
     39   // first MBB of the function.
     40   void initGlobalBaseReg(MachineFunction &MF);
     41 
     42   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
     43   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
     44 
     45   bool hasByvalArg() const { return HasByvalArg; }
     46   void setFormalArgInfo(unsigned Size, bool HasByval) {
     47     IncomingArgSize = Size;
     48     HasByvalArg = HasByval;
     49   }
     50 
     51   unsigned getIncomingArgSize() const { return IncomingArgSize; }
     52 
     53   bool callsEhReturn() const { return CallsEhReturn; }
     54   void setCallsEhReturn() { CallsEhReturn = true; }
     55 
     56   void createEhDataRegsFI(MachineFunction &MF);
     57   int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
     58   bool isEhDataRegFI(int FI) const;
     59 
     60   /// Create a MachinePointerInfo that has an ExternalSymbolPseudoSourceValue
     61   /// object representing a GOT entry for an external function.
     62   MachinePointerInfo callPtrInfo(MachineFunction &MF, const char *ES);
     63 
     64   // Functions with the "interrupt" attribute require special prologues,
     65   // epilogues and additional spill slots.
     66   bool isISR() const { return IsISR; }
     67   void setISR() { IsISR = true; }
     68   void createISRRegFI(MachineFunction &MF);
     69   int getISRRegFI(Register Reg) const { return ISRDataRegFI[Reg]; }
     70   bool isISRRegFI(int FI) const;
     71 
     72   /// Create a MachinePointerInfo that has a GlobalValuePseudoSourceValue object
     73   /// representing a GOT entry for a global function.
     74   MachinePointerInfo callPtrInfo(MachineFunction &MF, const GlobalValue *GV);
     75 
     76   void setSaveS2() { SaveS2 = true; }
     77   bool hasSaveS2() const { return SaveS2; }
     78 
     79   int getMoveF64ViaSpillFI(MachineFunction &MF, const TargetRegisterClass *RC);
     80 
     81   std::map<const char *, const Mips16HardFloatInfo::FuncSignature *>
     82   StubsNeeded;
     83 
     84 private:
     85   virtual void anchor();
     86 
     87   /// SRetReturnReg - Some subtargets require that sret lowering includes
     88   /// returning the value of the returned struct in a register. This field
     89   /// holds the virtual register into which the sret argument is passed.
     90   Register SRetReturnReg;
     91 
     92   /// GlobalBaseReg - keeps track of the virtual register initialized for
     93   /// use as the global base register. This is used for PIC in some PIC
     94   /// relocation models.
     95   Register GlobalBaseReg;
     96 
     97   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
     98   int VarArgsFrameIndex = 0;
     99 
    100   /// True if function has a byval argument.
    101   bool HasByvalArg;
    102 
    103   /// Size of incoming argument area.
    104   unsigned IncomingArgSize;
    105 
    106   /// CallsEhReturn - Whether the function calls llvm.eh.return.
    107   bool CallsEhReturn = false;
    108 
    109   /// Frame objects for spilling eh data registers.
    110   int EhDataRegFI[4];
    111 
    112   /// ISR - Whether the function is an Interrupt Service Routine.
    113   bool IsISR = false;
    114 
    115   /// Frame objects for spilling C0_STATUS, C0_EPC
    116   int ISRDataRegFI[2];
    117 
    118   // saveS2
    119   bool SaveS2 = false;
    120 
    121   /// FrameIndex for expanding BuildPairF64 nodes to spill and reload when the
    122   /// O32 FPXX ABI is enabled. -1 is used to denote invalid index.
    123   int MoveF64ViaSpillFI = -1;
    124 };
    125 
    126 } // end namespace llvm
    127 
    128 #endif // LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H
    129