1 //=- AArch64MachineFunctionInfo.h - AArch64 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 AArch64-specific per-machine-function information. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H 15 #define LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H 16 17 #include "llvm/ADT/SmallPtrSet.h" 18 #include "llvm/ADT/SmallVector.h" 19 #include "llvm/CodeGen/MachineFunction.h" 20 #include "llvm/MC/MCLinkerOptimizationHint.h" 21 22 namespace llvm { 23 24 /// AArch64FunctionInfo - This class is derived from MachineFunctionInfo and 25 /// contains private AArch64-specific information for each MachineFunction. 26 class AArch64FunctionInfo : public MachineFunctionInfo { 27 28 /// Number of bytes of arguments this function has on the stack. If the callee 29 /// is expected to restore the argument stack this should be a multiple of 16, 30 /// all usable during a tail call. 31 /// 32 /// The alternative would forbid tail call optimisation in some cases: if we 33 /// want to transfer control from a function with 8-bytes of stack-argument 34 /// space to a function with 16-bytes then misalignment of this value would 35 /// make a stack adjustment necessary, which could not be undone by the 36 /// callee. 37 unsigned BytesInStackArgArea; 38 39 /// The number of bytes to restore to deallocate space for incoming 40 /// arguments. Canonically 0 in the C calling convention, but non-zero when 41 /// callee is expected to pop the args. 42 unsigned ArgumentStackToRestore; 43 44 /// HasStackFrame - True if this function has a stack frame. Set by 45 /// determineCalleeSaves(). 46 bool HasStackFrame; 47 48 /// \brief Amount of stack frame size, not including callee-saved registers. 49 unsigned LocalStackSize; 50 51 /// \brief Number of TLS accesses using the special (combinable) 52 /// _TLS_MODULE_BASE_ symbol. 53 unsigned NumLocalDynamicTLSAccesses; 54 55 /// \brief FrameIndex for start of varargs area for arguments passed on the 56 /// stack. 57 int VarArgsStackIndex; 58 59 /// \brief FrameIndex for start of varargs area for arguments passed in 60 /// general purpose registers. 61 int VarArgsGPRIndex; 62 63 /// \brief Size of the varargs area for arguments passed in general purpose 64 /// registers. 65 unsigned VarArgsGPRSize; 66 67 /// \brief FrameIndex for start of varargs area for arguments passed in 68 /// floating-point registers. 69 int VarArgsFPRIndex; 70 71 /// \brief Size of the varargs area for arguments passed in floating-point 72 /// registers. 73 unsigned VarArgsFPRSize; 74 75 /// True if this function has a subset of CSRs that is handled explicitly via 76 /// copies. 77 bool IsSplitCSR; 78 79 public: AArch64FunctionInfo()80 AArch64FunctionInfo() 81 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false), 82 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0), 83 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0), 84 IsSplitCSR(false) {} 85 AArch64FunctionInfo(MachineFunction & MF)86 explicit AArch64FunctionInfo(MachineFunction &MF) 87 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false), 88 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0), 89 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0), 90 IsSplitCSR(false) { 91 (void)MF; 92 } 93 getBytesInStackArgArea()94 unsigned getBytesInStackArgArea() const { return BytesInStackArgArea; } setBytesInStackArgArea(unsigned bytes)95 void setBytesInStackArgArea(unsigned bytes) { BytesInStackArgArea = bytes; } 96 getArgumentStackToRestore()97 unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore; } setArgumentStackToRestore(unsigned bytes)98 void setArgumentStackToRestore(unsigned bytes) { 99 ArgumentStackToRestore = bytes; 100 } 101 hasStackFrame()102 bool hasStackFrame() const { return HasStackFrame; } setHasStackFrame(bool s)103 void setHasStackFrame(bool s) { HasStackFrame = s; } 104 isSplitCSR()105 bool isSplitCSR() const { return IsSplitCSR; } setIsSplitCSR(bool s)106 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 107 setLocalStackSize(unsigned Size)108 void setLocalStackSize(unsigned Size) { LocalStackSize = Size; } getLocalStackSize()109 unsigned getLocalStackSize() const { return LocalStackSize; } 110 incNumLocalDynamicTLSAccesses()111 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamicTLSAccesses; } getNumLocalDynamicTLSAccesses()112 unsigned getNumLocalDynamicTLSAccesses() const { 113 return NumLocalDynamicTLSAccesses; 114 } 115 getVarArgsStackIndex()116 int getVarArgsStackIndex() const { return VarArgsStackIndex; } setVarArgsStackIndex(int Index)117 void setVarArgsStackIndex(int Index) { VarArgsStackIndex = Index; } 118 getVarArgsGPRIndex()119 int getVarArgsGPRIndex() const { return VarArgsGPRIndex; } setVarArgsGPRIndex(int Index)120 void setVarArgsGPRIndex(int Index) { VarArgsGPRIndex = Index; } 121 getVarArgsGPRSize()122 unsigned getVarArgsGPRSize() const { return VarArgsGPRSize; } setVarArgsGPRSize(unsigned Size)123 void setVarArgsGPRSize(unsigned Size) { VarArgsGPRSize = Size; } 124 getVarArgsFPRIndex()125 int getVarArgsFPRIndex() const { return VarArgsFPRIndex; } setVarArgsFPRIndex(int Index)126 void setVarArgsFPRIndex(int Index) { VarArgsFPRIndex = Index; } 127 getVarArgsFPRSize()128 unsigned getVarArgsFPRSize() const { return VarArgsFPRSize; } setVarArgsFPRSize(unsigned Size)129 void setVarArgsFPRSize(unsigned Size) { VarArgsFPRSize = Size; } 130 131 typedef SmallPtrSet<const MachineInstr *, 16> SetOfInstructions; 132 getLOHRelated()133 const SetOfInstructions &getLOHRelated() const { return LOHRelated; } 134 135 // Shortcuts for LOH related types. 136 class MILOHDirective { 137 MCLOHType Kind; 138 139 /// Arguments of this directive. Order matters. 140 SmallVector<const MachineInstr *, 3> Args; 141 142 public: 143 typedef SmallVectorImpl<const MachineInstr *> LOHArgs; 144 MILOHDirective(MCLOHType Kind,const LOHArgs & Args)145 MILOHDirective(MCLOHType Kind, const LOHArgs &Args) 146 : Kind(Kind), Args(Args.begin(), Args.end()) { 147 assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!"); 148 } 149 getKind()150 MCLOHType getKind() const { return Kind; } getArgs()151 const LOHArgs &getArgs() const { return Args; } 152 }; 153 154 typedef MILOHDirective::LOHArgs MILOHArgs; 155 typedef SmallVector<MILOHDirective, 32> MILOHContainer; 156 getLOHContainer()157 const MILOHContainer &getLOHContainer() const { return LOHContainerSet; } 158 159 /// Add a LOH directive of this @p Kind and this @p Args. addLOHDirective(MCLOHType Kind,const MILOHArgs & Args)160 void addLOHDirective(MCLOHType Kind, const MILOHArgs &Args) { 161 LOHContainerSet.push_back(MILOHDirective(Kind, Args)); 162 LOHRelated.insert(Args.begin(), Args.end()); 163 } 164 165 private: 166 // Hold the lists of LOHs. 167 MILOHContainer LOHContainerSet; 168 SetOfInstructions LOHRelated; 169 }; 170 } // End llvm namespace 171 172 #endif 173