1 //===-- X86MachineFunctionInfo.h - X86 machine function info ----*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file declares X86-specific per-machine-function information. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H 14 #define LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H 15 16 #include "llvm/ADT/ArrayRef.h" 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/CodeGen/CallingConvLower.h" 19 #include "llvm/CodeGen/MachineFunction.h" 20 21 namespace llvm { 22 23 /// X86MachineFunctionInfo - This class is derived from MachineFunction and 24 /// contains private X86 target-specific information for each MachineFunction. 25 class X86MachineFunctionInfo : public MachineFunctionInfo { 26 virtual void anchor(); 27 28 /// ForceFramePointer - True if the function is required to use of frame 29 /// pointer for reasons other than it containing dynamic allocation or 30 /// that FP eliminatation is turned off. For example, Cygwin main function 31 /// contains stack pointer re-alignment code which requires FP. 32 bool ForceFramePointer = false; 33 34 /// RestoreBasePointerOffset - Non-zero if the function has base pointer 35 /// and makes call to llvm.eh.sjlj.setjmp. When non-zero, the value is a 36 /// displacement from the frame pointer to a slot where the base pointer 37 /// is stashed. 38 signed char RestoreBasePointerOffset = 0; 39 40 /// WinEHXMMSlotInfo - Slot information of XMM registers in the stack frame 41 /// in bytes. 42 DenseMap<int, unsigned> WinEHXMMSlotInfo; 43 44 /// CalleeSavedFrameSize - Size of the callee-saved register portion of the 45 /// stack frame in bytes. 46 unsigned CalleeSavedFrameSize = 0; 47 48 /// BytesToPopOnReturn - Number of bytes function pops on return (in addition 49 /// to the space used by the return address). 50 /// Used on windows platform for stdcall & fastcall name decoration 51 unsigned BytesToPopOnReturn = 0; 52 53 /// ReturnAddrIndex - FrameIndex for return slot. 54 int ReturnAddrIndex = 0; 55 56 /// FrameIndex for return slot. 57 int FrameAddrIndex = 0; 58 59 /// TailCallReturnAddrDelta - The number of bytes by which return address 60 /// stack slot is moved as the result of tail call optimization. 61 int TailCallReturnAddrDelta = 0; 62 63 /// SRetReturnReg - Some subtargets require that sret lowering includes 64 /// returning the value of the returned struct in a register. This field 65 /// holds the virtual register into which the sret argument is passed. 66 Register SRetReturnReg; 67 68 /// GlobalBaseReg - keeps track of the virtual register initialized for 69 /// use as the global base register. This is used for PIC in some PIC 70 /// relocation models. 71 Register GlobalBaseReg; 72 73 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 74 int VarArgsFrameIndex = 0; 75 /// RegSaveFrameIndex - X86-64 vararg func register save area. 76 int RegSaveFrameIndex = 0; 77 /// VarArgsGPOffset - X86-64 vararg func int reg offset. 78 unsigned VarArgsGPOffset = 0; 79 /// VarArgsFPOffset - X86-64 vararg func fp reg offset. 80 unsigned VarArgsFPOffset = 0; 81 /// ArgumentStackSize - The number of bytes on stack consumed by the arguments 82 /// being passed on the stack. 83 unsigned ArgumentStackSize = 0; 84 /// NumLocalDynamics - Number of local-dynamic TLS accesses. 85 unsigned NumLocalDynamics = 0; 86 /// HasPushSequences - Keeps track of whether this function uses sequences 87 /// of pushes to pass function parameters. 88 bool HasPushSequences = false; 89 90 /// True if the function recovers from an SEH exception, and therefore needs 91 /// to spill and restore the frame pointer. 92 bool HasSEHFramePtrSave = false; 93 94 /// The frame index of a stack object containing the original frame pointer 95 /// used to address arguments in a function using a base pointer. 96 int SEHFramePtrSaveIndex = 0; 97 98 /// True if this function has a subset of CSRs that is handled explicitly via 99 /// copies. 100 bool IsSplitCSR = false; 101 102 /// True if this function uses the red zone. 103 bool UsesRedZone = false; 104 105 /// True if this function has WIN_ALLOCA instructions. 106 bool HasWinAlloca = false; 107 108 /// True if this function has any preallocated calls. 109 bool HasPreallocatedCall = false; 110 111 ValueMap<const Value *, size_t> PreallocatedIds; 112 SmallVector<size_t, 0> PreallocatedStackSizes; 113 SmallVector<SmallVector<size_t, 4>, 0> PreallocatedArgOffsets; 114 115 private: 116 /// ForwardedMustTailRegParms - A list of virtual and physical registers 117 /// that must be forwarded to every musttail call. 118 SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms; 119 120 public: 121 X86MachineFunctionInfo() = default; 122 123 explicit X86MachineFunctionInfo(MachineFunction &MF) {} 124 125 bool getForceFramePointer() const { return ForceFramePointer;} 126 void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; } 127 128 bool getHasPushSequences() const { return HasPushSequences; } 129 void setHasPushSequences(bool HasPush) { HasPushSequences = HasPush; } 130 131 bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; } 132 void setRestoreBasePointer(const MachineFunction *MF); 133 int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; } 134 135 DenseMap<int, unsigned>& getWinEHXMMSlotInfo() { return WinEHXMMSlotInfo; } 136 const DenseMap<int, unsigned>& getWinEHXMMSlotInfo() const { 137 return WinEHXMMSlotInfo; } 138 139 unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; } 140 void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; } 141 142 unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; } 143 void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;} 144 145 int getRAIndex() const { return ReturnAddrIndex; } 146 void setRAIndex(int Index) { ReturnAddrIndex = Index; } 147 148 int getFAIndex() const { return FrameAddrIndex; } 149 void setFAIndex(int Index) { FrameAddrIndex = Index; } 150 151 int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; } 152 void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;} 153 154 Register getSRetReturnReg() const { return SRetReturnReg; } 155 void setSRetReturnReg(Register Reg) { SRetReturnReg = Reg; } 156 157 Register getGlobalBaseReg() const { return GlobalBaseReg; } 158 void setGlobalBaseReg(Register Reg) { GlobalBaseReg = Reg; } 159 160 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 161 void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; } 162 163 int getRegSaveFrameIndex() const { return RegSaveFrameIndex; } 164 void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; } 165 166 unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; } 167 void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; } 168 169 unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; } 170 void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; } 171 172 unsigned getArgumentStackSize() const { return ArgumentStackSize; } 173 void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; } 174 175 unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; } 176 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; } 177 178 bool getHasSEHFramePtrSave() const { return HasSEHFramePtrSave; } 179 void setHasSEHFramePtrSave(bool V) { HasSEHFramePtrSave = V; } 180 181 int getSEHFramePtrSaveIndex() const { return SEHFramePtrSaveIndex; } 182 void setSEHFramePtrSaveIndex(int Index) { SEHFramePtrSaveIndex = Index; } 183 184 SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() { 185 return ForwardedMustTailRegParms; 186 } 187 188 bool isSplitCSR() const { return IsSplitCSR; } 189 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 190 191 bool getUsesRedZone() const { return UsesRedZone; } 192 void setUsesRedZone(bool V) { UsesRedZone = V; } 193 194 bool hasWinAlloca() const { return HasWinAlloca; } 195 void setHasWinAlloca(bool v) { HasWinAlloca = v; } 196 197 bool hasPreallocatedCall() const { return HasPreallocatedCall; } 198 void setHasPreallocatedCall(bool v) { HasPreallocatedCall = v; } 199 200 size_t getPreallocatedIdForCallSite(const Value *CS) { 201 auto Insert = PreallocatedIds.insert({CS, PreallocatedIds.size()}); 202 if (Insert.second) { 203 PreallocatedStackSizes.push_back(0); 204 PreallocatedArgOffsets.emplace_back(); 205 } 206 return Insert.first->second; 207 } 208 209 void setPreallocatedStackSize(size_t Id, size_t StackSize) { 210 PreallocatedStackSizes[Id] = StackSize; 211 } 212 213 size_t getPreallocatedStackSize(const size_t Id) { 214 assert(PreallocatedStackSizes[Id] != 0 && "stack size not set"); 215 return PreallocatedStackSizes[Id]; 216 } 217 218 void setPreallocatedArgOffsets(size_t Id, ArrayRef<size_t> AO) { 219 PreallocatedArgOffsets[Id].assign(AO.begin(), AO.end()); 220 } 221 222 const ArrayRef<size_t> getPreallocatedArgOffsets(const size_t Id) { 223 assert(!PreallocatedArgOffsets[Id].empty() && "arg offsets not set"); 224 return PreallocatedArgOffsets[Id]; 225 } 226 }; 227 228 } // End llvm namespace 229 230 #endif 231