lib/Target/X86/X86MachineFunctionInfo.h

   1 //====- X86MachineFuctionInfo.h - X86 machine function info -----*- 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 X86-specific per-machine-function information.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef X86MACHINEFUNCTIONINFO_H
  15 #define X86MACHINEFUNCTIONINFO_H
  16
  17 #include "llvm/CodeGen/MachineFunction.h"
  18
  19 namespace llvm {
  20
  21 enum NameDecorationStyle {
  22   None,
  23   StdCall,
  24   FastCall
  25 };
  26
  27 /// X86MachineFunctionInfo - This class is derived from MachineFunction and
  28 /// contains private X86 target-specific information for each MachineFunction.
  29 class X86MachineFunctionInfo : public MachineFunctionInfo {
  30   /// ForceFramePointer - True if the function is required to use of frame
  31   /// pointer for reasons other than it containing dynamic allocation or
  32   /// that FP eliminatation is turned off. For example, Cygwin main function
  33   /// contains stack pointer re-alignment code which requires FP.
  34   bool ForceFramePointer;
  35
  36   /// CalleeSavedFrameSize - Size of the callee-saved register portion of the
  37   /// stack frame in bytes.
  38   unsigned CalleeSavedFrameSize;
  39
  40   /// BytesToPopOnReturn - Number of bytes function pops on return.
  41   /// Used on windows platform for stdcall & fastcall name decoration
  42   unsigned BytesToPopOnReturn;
  43
  44   /// DecorationStyle - If the function requires additional name decoration,
  45   /// DecorationStyle holds the right way to do so.
  46   NameDecorationStyle DecorationStyle;
  47
  48   /// ReturnAddrIndex - FrameIndex for return slot.
  49   int ReturnAddrIndex;
  50
  51   /// TailCallReturnAddrDelta - Delta the ReturnAddr stack slot is moved
  52   /// Used for creating an area before the register spill area on the stack
  53   /// the returnaddr can be savely move to this area
  54   int TailCallReturnAddrDelta;
  55
  56   /// SRetReturnReg - Some subtargets require that sret lowering includes
  57   /// returning the value of the returned struct in a register. This field
  58   /// holds the virtual register into which the sret argument is passed.
  59   unsigned SRetReturnReg;
  60
  61   /// GlobalBaseReg - keeps track of the virtual register initialized for
  62   /// use as the global base register. This is used for PIC in some PIC
  63   /// relocation models.
  64   unsigned GlobalBaseReg;
  65
  66 public:
  67   X86MachineFunctionInfo() : ForceFramePointer(false),
  68                              CalleeSavedFrameSize(0),
  69                              BytesToPopOnReturn(0),
  70                              DecorationStyle(None),
  71                              ReturnAddrIndex(0),
  72                              TailCallReturnAddrDelta(0),
  73                              SRetReturnReg(0),
  74                              GlobalBaseReg(0) {}
  75
  76   explicit X86MachineFunctionInfo(MachineFunction &MF)
  77     : ForceFramePointer(false),
  78       CalleeSavedFrameSize(0),
  79       BytesToPopOnReturn(0),
  80       DecorationStyle(None),
  81       ReturnAddrIndex(0),
  82       TailCallReturnAddrDelta(0),
  83       SRetReturnReg(0),
  84       GlobalBaseReg(0) {}
  85
  86   bool getForceFramePointer() const { return ForceFramePointer;}
  87   void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
  88
  89   unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
  90   void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
  91
  92   unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
  93   void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
  94
  95   NameDecorationStyle getDecorationStyle() const { return DecorationStyle; }
  96   void setDecorationStyle(NameDecorationStyle style) { DecorationStyle = style;}
  97
  98   int getRAIndex() const { return ReturnAddrIndex; }
  99   void setRAIndex(int Index) { ReturnAddrIndex = Index; }
 100
 101   int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
 102   void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
 103
 104   unsigned getSRetReturnReg() const { return SRetReturnReg; }
 105   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
 106
 107   unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
 108   void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
 109 };
 110
 111 } // End llvm namespace
 112
 113 #endif