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 Amount of stack frame size used for saving callee-saved registers. 52 unsigned CalleeSavedStackSize; 53 54 /// \brief Number of TLS accesses using the special (combinable) 55 /// _TLS_MODULE_BASE_ symbol. 56 unsigned NumLocalDynamicTLSAccesses; 57 58 /// \brief FrameIndex for start of varargs area for arguments passed on the 59 /// stack. 60 int VarArgsStackIndex; 61 62 /// \brief FrameIndex for start of varargs area for arguments passed in 63 /// general purpose registers. 64 int VarArgsGPRIndex; 65 66 /// \brief Size of the varargs area for arguments passed in general purpose 67 /// registers. 68 unsigned VarArgsGPRSize; 69 70 /// \brief FrameIndex for start of varargs area for arguments passed in 71 /// floating-point registers. 72 int VarArgsFPRIndex; 73 74 /// \brief Size of the varargs area for arguments passed in floating-point 75 /// registers. 76 unsigned VarArgsFPRSize; 77 78 /// True if this function has a subset of CSRs that is handled explicitly via 79 /// copies. 80 bool IsSplitCSR; 81 82 /// True when the stack gets realigned dynamically because the size of stack 83 /// frame is unknown at compile time. e.g., in case of VLAs. 84 bool StackRealigned; 85 86 /// True when the callee-save stack area has unused gaps that may be used for 87 /// other stack allocations. 88 bool CalleeSaveStackHasFreeSpace; 89 90 public: 91 AArch64FunctionInfo() 92 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false), 93 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0), 94 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0), 95 IsSplitCSR(false), StackRealigned(false), 96 CalleeSaveStackHasFreeSpace(false) {} 97 98 explicit AArch64FunctionInfo(MachineFunction &MF) 99 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false), 100 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0), 101 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0), 102 IsSplitCSR(false), StackRealigned(false), 103 CalleeSaveStackHasFreeSpace(false) { 104 (void)MF; 105 } 106 107 unsigned getBytesInStackArgArea() const { return BytesInStackArgArea; } 108 void setBytesInStackArgArea(unsigned bytes) { BytesInStackArgArea = bytes; } 109 110 unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore; } 111 void setArgumentStackToRestore(unsigned bytes) { 112 ArgumentStackToRestore = bytes; 113 } 114 115 bool hasStackFrame() const { return HasStackFrame; } 116 void setHasStackFrame(bool s) { HasStackFrame = s; } 117 118 bool isStackRealigned() const { return StackRealigned; } 119 void setStackRealigned(bool s) { StackRealigned = s; } 120 121 bool hasCalleeSaveStackFreeSpace() const { 122 return CalleeSaveStackHasFreeSpace; 123 } 124 void setCalleeSaveStackHasFreeSpace(bool s) { 125 CalleeSaveStackHasFreeSpace = s; 126 } 127 128 bool isSplitCSR() const { return IsSplitCSR; } 129 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 130 131 void setLocalStackSize(unsigned Size) { LocalStackSize = Size; } 132 unsigned getLocalStackSize() const { return LocalStackSize; } 133 134 void setCalleeSavedStackSize(unsigned Size) { CalleeSavedStackSize = Size; } 135 unsigned getCalleeSavedStackSize() const { return CalleeSavedStackSize; } 136 137 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamicTLSAccesses; } 138 unsigned getNumLocalDynamicTLSAccesses() const { 139 return NumLocalDynamicTLSAccesses; 140 } 141 142 int getVarArgsStackIndex() const { return VarArgsStackIndex; } 143 void setVarArgsStackIndex(int Index) { VarArgsStackIndex = Index; } 144 145 int getVarArgsGPRIndex() const { return VarArgsGPRIndex; } 146 void setVarArgsGPRIndex(int Index) { VarArgsGPRIndex = Index; } 147 148 unsigned getVarArgsGPRSize() const { return VarArgsGPRSize; } 149 void setVarArgsGPRSize(unsigned Size) { VarArgsGPRSize = Size; } 150 151 int getVarArgsFPRIndex() const { return VarArgsFPRIndex; } 152 void setVarArgsFPRIndex(int Index) { VarArgsFPRIndex = Index; } 153 154 unsigned getVarArgsFPRSize() const { return VarArgsFPRSize; } 155 void setVarArgsFPRSize(unsigned Size) { VarArgsFPRSize = Size; } 156 157 typedef SmallPtrSet<const MachineInstr *, 16> SetOfInstructions; 158 159 const SetOfInstructions &getLOHRelated() const { return LOHRelated; } 160 161 // Shortcuts for LOH related types. 162 class MILOHDirective { 163 MCLOHType Kind; 164 165 /// Arguments of this directive. Order matters. 166 SmallVector<const MachineInstr *, 3> Args; 167 168 public: 169 typedef ArrayRef<const MachineInstr *> LOHArgs; 170 171 MILOHDirective(MCLOHType Kind, LOHArgs Args) 172 : Kind(Kind), Args(Args.begin(), Args.end()) { 173 assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!"); 174 } 175 176 MCLOHType getKind() const { return Kind; } 177 LOHArgs getArgs() const { return Args; } 178 }; 179 180 typedef MILOHDirective::LOHArgs MILOHArgs; 181 typedef SmallVector<MILOHDirective, 32> MILOHContainer; 182 183 const MILOHContainer &getLOHContainer() const { return LOHContainerSet; } 184 185 /// Add a LOH directive of this @p Kind and this @p Args. 186 void addLOHDirective(MCLOHType Kind, MILOHArgs Args) { 187 LOHContainerSet.push_back(MILOHDirective(Kind, Args)); 188 LOHRelated.insert(Args.begin(), Args.end()); 189 } 190 191 private: 192 // Hold the lists of LOHs. 193 MILOHContainer LOHContainerSet; 194 SetOfInstructions LOHRelated; 195 }; 196 } // End llvm namespace 197 198 #endif 199
