1 //===-- X86MachineFunctionInfo.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 LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H 15 #define LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H 16 17 #include "llvm/CodeGen/CallingConvLower.h" 18 #include "llvm/CodeGen/MachineFunction.h" 19 #include "llvm/CodeGen/MachineValueType.h" 20 #include <vector> 21 22 namespace llvm { 23 24 /// X86MachineFunctionInfo - This class is derived from MachineFunction and 25 /// contains private X86 target-specific information for each MachineFunction. 26 class X86MachineFunctionInfo : public MachineFunctionInfo { 27 virtual void anchor(); 28 29 /// ForceFramePointer - True if the function is required to use of frame 30 /// pointer for reasons other than it containing dynamic allocation or 31 /// that FP eliminatation is turned off. For example, Cygwin main function 32 /// contains stack pointer re-alignment code which requires FP. 33 bool ForceFramePointer = false; 34 35 /// RestoreBasePointerOffset - Non-zero if the function has base pointer 36 /// and makes call to llvm.eh.sjlj.setjmp. When non-zero, the value is a 37 /// displacement from the frame pointer to a slot where the base pointer 38 /// is stashed. 39 signed char RestoreBasePointerOffset = 0; 40 41 /// CalleeSavedFrameSize - Size of the callee-saved register portion of the 42 /// stack frame in bytes. 43 unsigned CalleeSavedFrameSize = 0; 44 45 /// BytesToPopOnReturn - Number of bytes function pops on return (in addition 46 /// to the space used by the return address). 47 /// Used on windows platform for stdcall & fastcall name decoration 48 unsigned BytesToPopOnReturn = 0; 49 50 /// ReturnAddrIndex - FrameIndex for return slot. 51 int ReturnAddrIndex = 0; 52 53 /// \brief FrameIndex for return slot. 54 int FrameAddrIndex = 0; 55 56 /// TailCallReturnAddrDelta - The number of bytes by which return address 57 /// stack slot is moved as the result of tail call optimization. 58 int TailCallReturnAddrDelta = 0; 59 60 /// SRetReturnReg - Some subtargets require that sret lowering includes 61 /// returning the value of the returned struct in a register. This field 62 /// holds the virtual register into which the sret argument is passed. 63 unsigned SRetReturnReg = 0; 64 65 /// GlobalBaseReg - keeps track of the virtual register initialized for 66 /// use as the global base register. This is used for PIC in some PIC 67 /// relocation models. 68 unsigned GlobalBaseReg = 0; 69 70 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 71 int VarArgsFrameIndex = 0; 72 /// RegSaveFrameIndex - X86-64 vararg func register save area. 73 int RegSaveFrameIndex = 0; 74 /// VarArgsGPOffset - X86-64 vararg func int reg offset. 75 unsigned VarArgsGPOffset = 0; 76 /// VarArgsFPOffset - X86-64 vararg func fp reg offset. 77 unsigned VarArgsFPOffset = 0; 78 /// ArgumentStackSize - The number of bytes on stack consumed by the arguments 79 /// being passed on the stack. 80 unsigned ArgumentStackSize = 0; 81 /// NumLocalDynamics - Number of local-dynamic TLS accesses. 82 unsigned NumLocalDynamics = 0; 83 /// HasPushSequences - Keeps track of whether this function uses sequences 84 /// of pushes to pass function parameters. 85 bool HasPushSequences = false; 86 87 /// True if the function recovers from an SEH exception, and therefore needs 88 /// to spill and restore the frame pointer. 89 bool HasSEHFramePtrSave = false; 90 91 /// The frame index of a stack object containing the original frame pointer 92 /// used to address arguments in a function using a base pointer. 93 int SEHFramePtrSaveIndex = 0; 94 95 private: 96 /// ForwardedMustTailRegParms - A list of virtual and physical registers 97 /// that must be forwarded to every musttail call. 98 SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms; 99 100 public: 101 X86MachineFunctionInfo() = default; 102 103 explicit X86MachineFunctionInfo(MachineFunction &MF) {} 104 105 bool getForceFramePointer() const { return ForceFramePointer;} 106 void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; } 107 108 bool getHasPushSequences() const { return HasPushSequences; } 109 void setHasPushSequences(bool HasPush) { HasPushSequences = HasPush; } 110 111 bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; } 112 void setRestoreBasePointer(const MachineFunction *MF); 113 int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; } 114 115 unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; } 116 void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; } 117 118 unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; } 119 void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;} 120 121 int getRAIndex() const { return ReturnAddrIndex; } 122 void setRAIndex(int Index) { ReturnAddrIndex = Index; } 123 124 int getFAIndex() const { return FrameAddrIndex; } 125 void setFAIndex(int Index) { FrameAddrIndex = Index; } 126 127 int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; } 128 void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;} 129 130 unsigned getSRetReturnReg() const { return SRetReturnReg; } 131 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; } 132 133 unsigned getGlobalBaseReg() const { return GlobalBaseReg; } 134 void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; } 135 136 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 137 void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; } 138 139 int getRegSaveFrameIndex() const { return RegSaveFrameIndex; } 140 void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; } 141 142 unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; } 143 void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; } 144 145 unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; } 146 void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; } 147 148 unsigned getArgumentStackSize() const { return ArgumentStackSize; } 149 void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; } 150 151 unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; } 152 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; } 153 154 bool getHasSEHFramePtrSave() const { return HasSEHFramePtrSave; } 155 void setHasSEHFramePtrSave(bool V) { HasSEHFramePtrSave = V; } 156 157 int getSEHFramePtrSaveIndex() const { return SEHFramePtrSaveIndex; } 158 void setSEHFramePtrSaveIndex(int Index) { SEHFramePtrSaveIndex = Index; } 159 160 SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() { 161 return ForwardedMustTailRegParms; 162 } 163 }; 164 165 } // End llvm namespace 166 167 #endif 168
