lib/Target/Mips/MipsMachineFunction.h

   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 <utility>
  18 #include "llvm/ADT/SmallVector.h"
  19 #include "llvm/ADT/VectorExtras.h"
  20 #include "llvm/CodeGen/MachineFunction.h"
  21 #include "llvm/CodeGen/MachineFrameInfo.h"
  22
  23 namespace llvm {
  24
  25 /// MipsFunctionInfo - This class is derived from MachineFunction private
  26 /// Mips target-specific information for each MachineFunction.
  27 class MipsFunctionInfo : public MachineFunctionInfo {
  28
  29 private:
  30   MachineFunction& MF;
  31   /// SRetReturnReg - Some subtargets require that sret lowering includes
  32   /// returning the value of the returned struct in a register. This field
  33   /// holds the virtual register into which the sret argument is passed.
  34   unsigned SRetReturnReg;
  35
  36   /// GlobalBaseReg - keeps track of the virtual register initialized for
  37   /// use as the global base register. This is used for PIC in some PIC
  38   /// relocation models.
  39   unsigned GlobalBaseReg;
  40
  41   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
  42   int VarArgsFrameIndex;
  43
  44   // Range of frame object indices.
  45   // InArgFIRange: Range of indices of all frame objects created during call to
  46   //               LowerFormalArguments.
  47   // OutArgFIRange: Range of indices of all frame objects created during call to
  48   //                LowerCall except for the frame object for restoring $gp.
  49   std::pair<int, int> InArgFIRange, OutArgFIRange;
  50   int GPFI; // Index of the frame object for restoring $gp
  51   mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
  52   unsigned MaxCallFrameSize;
  53
  54   /// AtomicFrameIndex - To implement atomic.swap and atomic.cmp.swap
  55   /// intrinsics, it is necessary to use a temporary stack location.
  56   /// This field holds the frame index of this location.
  57   int AtomicFrameIndex;
  58 public:
  59   MipsFunctionInfo(MachineFunction& MF)
  60   : MF(MF), SRetReturnReg(0), GlobalBaseReg(0),
  61     VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
  62     OutArgFIRange(std::make_pair(-1, 0)), GPFI(0), DynAllocFI(0),
  63     MaxCallFrameSize(0), AtomicFrameIndex(-1)
  64   {}
  65
  66   bool isInArgFI(int FI) const {
  67     return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
  68   }
  69   void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
  70
  71   bool isOutArgFI(int FI) const {
  72     return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
  73   }
  74   void extendOutArgFIRange(int FirstFI, int LastFI) {
  75     if (!OutArgFIRange.second)
  76       // this must be the first time this function was called.
  77       OutArgFIRange.first = FirstFI;
  78     OutArgFIRange.second = LastFI;
  79   }
  80
  81   int getGPFI() const { return GPFI; }
  82   void setGPFI(int FI) { GPFI = FI; }
  83   bool needGPSaveRestore() const { return getGPFI(); }
  84   bool isGPFI(int FI) const { return GPFI && GPFI == FI; }
  85
  86   // The first call to this function creates a frame object for dynamically
  87   // allocated stack area.
  88   int getDynAllocFI() const {
  89     if (!DynAllocFI)
  90       DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
  91
  92     return DynAllocFI;
  93   }
  94   bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
  95
  96   unsigned getSRetReturnReg() const { return SRetReturnReg; }
  97   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
  98
  99   unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
 100   void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
 101
 102   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
 103   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
 104
 105   unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
 106   void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
 107
 108   int getAtomicFrameIndex() const { return AtomicFrameIndex; }
 109   void setAtomicFrameIndex(int Index) { AtomicFrameIndex = Index; }
 110 };
 111
 112 } // end of namespace llvm
 113
 114 #endif // MIPS_MACHINE_FUNCTION_INFO_H