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   unsigned getGlobalBaseReg();
  36
  37   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
  38   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
  39
  40   bool hasByvalArg() const { return HasByvalArg; }
  41   void setFormalArgInfo(unsigned Size, bool HasByval) {
  42     IncomingArgSize = Size;
  43     HasByvalArg = HasByval;
  44   }
  45
  46   unsigned getIncomingArgSize() const { return IncomingArgSize; }
  47
  48   bool callsEhReturn() const { return CallsEhReturn; }
  49   void setCallsEhReturn() { CallsEhReturn = true; }
  50
  51   void createEhDataRegsFI();
  52   int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
  53   bool isEhDataRegFI(int FI) const;
  54
  55   /// Create a MachinePointerInfo that has an ExternalSymbolPseudoSourceValue
  56   /// object representing a GOT entry for an external function.
  57   MachinePointerInfo callPtrInfo(const char *ES);
  58
  59   // Functions with the "interrupt" attribute require special prologues,
  60   // epilogues and additional spill slots.
  61   bool isISR() const { return IsISR; }
  62   void setISR() { IsISR = true; }
  63   void createISRRegFI();
  64   int getISRRegFI(unsigned Reg) const { return ISRDataRegFI[Reg]; }
  65   bool isISRRegFI(int FI) const;
  66
  67   /// Create a MachinePointerInfo that has a GlobalValuePseudoSourceValue object
  68   /// representing a GOT entry for a global function.
  69   MachinePointerInfo callPtrInfo(const GlobalValue *GV);
  70
  71   void setSaveS2() { SaveS2 = true; }
  72   bool hasSaveS2() const { return SaveS2; }
  73
  74   int getMoveF64ViaSpillFI(const TargetRegisterClass *RC);
  75
  76   std::map<const char *, const Mips16HardFloatInfo::FuncSignature *>
  77   StubsNeeded;
  78
  79 private:
  80   virtual void anchor();
  81
  82   MachineFunction& MF;
  83
  84   /// SRetReturnReg - Some subtargets require that sret lowering includes
  85   /// returning the value of the returned struct in a register. This field
  86   /// holds the virtual register into which the sret argument is passed.
  87   unsigned SRetReturnReg = 0;
  88
  89   /// GlobalBaseReg - keeps track of the virtual register initialized for
  90   /// use as the global base register. This is used for PIC in some PIC
  91   /// relocation models.
  92   unsigned GlobalBaseReg = 0;
  93
  94   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
  95   int VarArgsFrameIndex = 0;
  96
  97   /// True if function has a byval argument.
  98   bool HasByvalArg;
  99
 100   /// Size of incoming argument area.
 101   unsigned IncomingArgSize;
 102
 103   /// CallsEhReturn - Whether the function calls llvm.eh.return.
 104   bool CallsEhReturn = false;
 105
 106   /// Frame objects for spilling eh data registers.
 107   int EhDataRegFI[4];
 108
 109   /// ISR - Whether the function is an Interrupt Service Routine.
 110   bool IsISR = false;
 111
 112   /// Frame objects for spilling C0_STATUS, C0_EPC
 113   int ISRDataRegFI[2];
 114
 115   // saveS2
 116   bool SaveS2 = false;
 117
 118   /// FrameIndex for expanding BuildPairF64 nodes to spill and reload when the
 119   /// O32 FPXX ABI is enabled. -1 is used to denote invalid index.
 120   int MoveF64ViaSpillFI = -1;
 121 };
 122
 123 } // end namespace llvm
 124
 125 #endif // LLVM_LIB_TARGET_MIPS_MIPSMACHINEFUNCTION_H