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      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 /// X86MachineFunctionInfo - This class is derived from MachineFunction and
     22 /// contains private X86 target-specific information for each MachineFunction.
     23 class X86MachineFunctionInfo : public MachineFunctionInfo {
     24   virtual void anchor();
     25 
     26   /// ForceFramePointer - True if the function is required to use of frame
     27   /// pointer for reasons other than it containing dynamic allocation or
     28   /// that FP eliminatation is turned off. For example, Cygwin main function
     29   /// contains stack pointer re-alignment code which requires FP.
     30   bool ForceFramePointer;
     31 
     32   /// CalleeSavedFrameSize - Size of the callee-saved register portion of the
     33   /// stack frame in bytes.
     34   unsigned CalleeSavedFrameSize;
     35 
     36   /// BytesToPopOnReturn - Number of bytes function pops on return (in addition
     37   /// to the space used by the return address).
     38   /// Used on windows platform for stdcall & fastcall name decoration
     39   unsigned BytesToPopOnReturn;
     40 
     41   /// ReturnAddrIndex - FrameIndex for return slot.
     42   int ReturnAddrIndex;
     43 
     44   /// TailCallReturnAddrDelta - The number of bytes by which return address
     45   /// stack slot is moved as the result of tail call optimization.
     46   int TailCallReturnAddrDelta;
     47 
     48   /// SRetReturnReg - Some subtargets require that sret lowering includes
     49   /// returning the value of the returned struct in a register. This field
     50   /// holds the virtual register into which the sret argument is passed.
     51   unsigned SRetReturnReg;
     52 
     53   /// GlobalBaseReg - keeps track of the virtual register initialized for
     54   /// use as the global base register. This is used for PIC in some PIC
     55   /// relocation models.
     56   unsigned GlobalBaseReg;
     57 
     58   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
     59   int VarArgsFrameIndex;
     60   /// RegSaveFrameIndex - X86-64 vararg func register save area.
     61   int RegSaveFrameIndex;
     62   /// VarArgsGPOffset - X86-64 vararg func int reg offset.
     63   unsigned VarArgsGPOffset;
     64   /// VarArgsFPOffset - X86-64 vararg func fp reg offset.
     65   unsigned VarArgsFPOffset;
     66   /// ArgumentStackSize - The number of bytes on stack consumed by the arguments
     67   /// being passed on the stack.
     68   unsigned ArgumentStackSize;
     69   /// NumLocalDynamics - Number of local-dynamic TLS accesses.
     70   unsigned NumLocalDynamics;
     71 
     72 public:
     73   X86MachineFunctionInfo() : ForceFramePointer(false),
     74                              CalleeSavedFrameSize(0),
     75                              BytesToPopOnReturn(0),
     76                              ReturnAddrIndex(0),
     77                              TailCallReturnAddrDelta(0),
     78                              SRetReturnReg(0),
     79                              GlobalBaseReg(0),
     80                              VarArgsFrameIndex(0),
     81                              RegSaveFrameIndex(0),
     82                              VarArgsGPOffset(0),
     83                              VarArgsFPOffset(0),
     84                              ArgumentStackSize(0),
     85                              NumLocalDynamics(0) {}
     86 
     87   explicit X86MachineFunctionInfo(MachineFunction &MF)
     88     : ForceFramePointer(false),
     89       CalleeSavedFrameSize(0),
     90       BytesToPopOnReturn(0),
     91       ReturnAddrIndex(0),
     92       TailCallReturnAddrDelta(0),
     93       SRetReturnReg(0),
     94       GlobalBaseReg(0),
     95       VarArgsFrameIndex(0),
     96       RegSaveFrameIndex(0),
     97       VarArgsGPOffset(0),
     98       VarArgsFPOffset(0),
     99       ArgumentStackSize(0),
    100       NumLocalDynamics(0) {}
    101 
    102   bool getForceFramePointer() const { return ForceFramePointer;}
    103   void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
    104 
    105   unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
    106   void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
    107 
    108   unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
    109   void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
    110 
    111   int getRAIndex() const { return ReturnAddrIndex; }
    112   void setRAIndex(int Index) { ReturnAddrIndex = Index; }
    113 
    114   int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
    115   void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
    116 
    117   unsigned getSRetReturnReg() const { return SRetReturnReg; }
    118   void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
    119 
    120   unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
    121   void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
    122 
    123   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
    124   void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
    125 
    126   int getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
    127   void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; }
    128 
    129   unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; }
    130   void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; }
    131 
    132   unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; }
    133   void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; }
    134 
    135   unsigned getArgumentStackSize() const { return ArgumentStackSize; }
    136   void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; }
    137 
    138   unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
    139   void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
    140 
    141 };
    142 
    143 } // End llvm namespace
    144 
    145 #endif
    146