lib/Target/Mips/MipsMachineFunction.h

   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) : MF(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();
  36   Register getGlobalBaseRegForGlobalISel();
  37
  38   // Insert instructions to initialize the global base register in the
  39   // first MBB of the function.
  40   void initGlobalBaseReg();
  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();
  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(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();
  69   int getISRRegFI(unsigned 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(const GlobalValue *GV);
  75
  76   void setSaveS2() { SaveS2 = true; }
  77   bool hasSaveS2() const { return SaveS2; }
  78
  79   int getMoveF64ViaSpillFI(const TargetRegisterClass *RC);
  80
  81   std::map<const char *, const Mips16HardFloatInfo::FuncSignature *>
  82   StubsNeeded;
  83
  84 private:
  85   virtual void anchor();
  86
  87   MachineFunction& MF;
  88
  89   /// SRetReturnReg - Some subtargets require that sret lowering includes
  90   /// returning the value of the returned struct in a register. This field
  91   /// holds the virtual register into which the sret argument is passed.
  92   unsigned SRetReturnReg = 0;
  93
  94   /// GlobalBaseReg - keeps track of the virtual register initialized for
  95   /// use as the global base register. This is used for PIC in some PIC
  96   /// relocation models.
  97   unsigned GlobalBaseReg = 0;
  98
  99   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
 100   int VarArgsFrameIndex = 0;
 101
 102   /// True if function has a byval argument.
 103   bool HasByvalArg;
 104
 105   /// Size of incoming argument area.
 106   unsigned IncomingArgSize;
 107
 108   /// CallsEhReturn - Whether the function calls llvm.eh.return.
 109   bool CallsEhReturn = false;
 110
 111   /// Frame objects for spilling eh data registers.
 112   int EhDataRegFI[4];
 113
 114   /// ISR - Whether the function is an Interrupt Service Routine.
 115   bool IsISR = false;
 116
 117   /// Frame objects for spilling C0_STATUS, C0_EPC
 118   int ISRDataRegFI[2];
 119
 120   // saveS2
 121   bool SaveS2 = false;
 122
 123   /// FrameIndex for expanding BuildPairF64 nodes to spill and reload when the
 124   /// O32 FPXX ABI is enabled. -1 is used to denote invalid index.
 125   int MoveF64ViaSpillFI = -1;
 126 };
 127
 128 } // end namespace llvm
 129
 130 #endif // LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H