lib/Target/X86/X86MachineFunctionInfo.h

   1 //====- X86MachineFuctionInfo.h - X86 machine function info -----*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the Evan Cheng and is distributed under
   6 // the University of Illinois Open Source 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 private
  28 /// 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 - amount of bytes function pops on return.
  41   /// Used on windows platform for stdcall & fastcall name decoration
  42   unsigned BytesToPopOnReturn;
  43
  44   /// If the function requires additional name decoration, DecorationStyle holds
  45   /// the right way to do so.
  46   NameDecorationStyle DecorationStyle;
  47
  48   // FrameIndex for return slot.
  49   int ReturnAddrIndex;
  50
  51   // 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 public:
  57   X86MachineFunctionInfo() : ForceFramePointer(false),
  58                              CalleeSavedFrameSize(0),
  59                              BytesToPopOnReturn(0),
  60                              DecorationStyle(None),
  61                              ReturnAddrIndex(0),
  62                              TailCallReturnAddrDelta(0){}
  63
  64   X86MachineFunctionInfo(MachineFunction &MF) : ForceFramePointer(false),
  65                                                 CalleeSavedFrameSize(0),
  66                                                 BytesToPopOnReturn(0),
  67                                                 DecorationStyle(None),
  68                                                 ReturnAddrIndex(0),
  69                                                 TailCallReturnAddrDelta(0) {}
  70
  71   bool getForceFramePointer() const { return ForceFramePointer;}
  72   void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
  73
  74   unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
  75   void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
  76
  77   unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
  78   void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
  79
  80   NameDecorationStyle getDecorationStyle() const { return DecorationStyle; }
  81   void setDecorationStyle(NameDecorationStyle style) { DecorationStyle = style;}
  82
  83   int getRAIndex() const { return ReturnAddrIndex; }
  84   void setRAIndex(int Index) { ReturnAddrIndex = Index; }
  85
  86   int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
  87   void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
  88 };
  89 } // End llvm namespace
  90
  91 #endif