1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- 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 the PowerPC specific subclass of MachineFunctionInfo. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 15 #define LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 16 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/CodeGen/MachineFunction.h" 19 20 namespace llvm { 21 22 /// PPCFunctionInfo - This class is derived from MachineFunction private 23 /// PowerPC target-specific information for each MachineFunction. 24 class PPCFunctionInfo : public MachineFunctionInfo { 25 virtual void anchor(); 26 27 /// FramePointerSaveIndex - Frame index of where the old frame pointer is 28 /// stored. Also used as an anchor for instructions that need to be altered 29 /// when using frame pointers (dyna_add, dyna_sub.) 30 int FramePointerSaveIndex = 0; 31 32 /// ReturnAddrSaveIndex - Frame index of where the return address is stored. 33 /// 34 int ReturnAddrSaveIndex = 0; 35 36 /// Frame index where the old base pointer is stored. 37 int BasePointerSaveIndex = 0; 38 39 /// Frame index where the old PIC base pointer is stored. 40 int PICBasePointerSaveIndex = 0; 41 42 /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current 43 /// function. This is only valid after the initial scan of the function by 44 /// PEI. 45 bool MustSaveLR; 46 47 /// Does this function have any stack spills. 48 bool HasSpills = false; 49 50 /// Does this function spill using instructions with only r+r (not r+i) 51 /// forms. 52 bool HasNonRISpills = false; 53 54 /// SpillsCR - Indicates whether CR is spilled in the current function. 55 bool SpillsCR = false; 56 57 /// Indicates whether VRSAVE is spilled in the current function. 58 bool SpillsVRSAVE = false; 59 60 /// LRStoreRequired - The bool indicates whether there is some explicit use of 61 /// the LR/LR8 stack slot that is not obvious from scanning the code. This 62 /// requires that the code generator produce a store of LR to the stack on 63 /// entry, even though LR may otherwise apparently not be used. 64 bool LRStoreRequired = false; 65 66 /// This function makes use of the PPC64 ELF TOC base pointer (register r2). 67 bool UsesTOCBasePtr = false; 68 69 /// MinReservedArea - This is the frame size that is at least reserved in a 70 /// potential caller (parameter+linkage area). 71 unsigned MinReservedArea = 0; 72 73 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum 74 /// amount the stack pointer is adjusted to make the frame bigger for tail 75 /// calls. Used for creating an area before the register spill area. 76 int TailCallSPDelta = 0; 77 78 /// HasFastCall - Does this function contain a fast call. Used to determine 79 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc). 80 bool HasFastCall = false; 81 82 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 83 int VarArgsFrameIndex = 0; 84 85 /// VarArgsStackOffset - StackOffset for start of stack 86 /// arguments. 87 88 int VarArgsStackOffset = 0; 89 90 /// VarArgsNumGPR - Index of the first unused integer 91 /// register for parameter passing. 92 unsigned VarArgsNumGPR = 0; 93 94 /// VarArgsNumFPR - Index of the first unused double 95 /// register for parameter passing. 96 unsigned VarArgsNumFPR = 0; 97 98 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4. 99 int CRSpillFrameIndex = 0; 100 101 /// If any of CR[2-4] need to be saved in the prologue and restored in the 102 /// epilogue then they are added to this array. This is used for the 103 /// 64-bit SVR4 ABI. 104 SmallVector<unsigned, 3> MustSaveCRs; 105 106 /// Hold onto our MachineFunction context. 107 MachineFunction &MF; 108 109 /// Whether this uses the PIC Base register or not. 110 bool UsesPICBase = false; 111 112 /// True if this function has a subset of CSRs that is handled explicitly via 113 /// copies 114 bool IsSplitCSR = false; 115 116 public: 117 explicit PPCFunctionInfo(MachineFunction &MF) : MF(MF) {} 118 119 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; } 120 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; } 121 122 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; } 123 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; } 124 125 int getBasePointerSaveIndex() const { return BasePointerSaveIndex; } 126 void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; } 127 128 int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex; } 129 void setPICBasePointerSaveIndex(int Idx) { PICBasePointerSaveIndex = Idx; } 130 131 unsigned getMinReservedArea() const { return MinReservedArea; } 132 void setMinReservedArea(unsigned size) { MinReservedArea = size; } 133 134 int getTailCallSPDelta() const { return TailCallSPDelta; } 135 void setTailCallSPDelta(int size) { TailCallSPDelta = size; } 136 137 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial 138 /// scan of the function. It is true if the LR/LR8 register is ever explicitly 139 /// defined/clobbered in the machine function (e.g. by calls and movpctolr, 140 /// which is used in PIC generation), or if the LR stack slot is explicitly 141 /// referenced by builtin_return_address. 142 void setMustSaveLR(bool U) { MustSaveLR = U; } 143 bool mustSaveLR() const { return MustSaveLR; } 144 145 void setHasSpills() { HasSpills = true; } 146 bool hasSpills() const { return HasSpills; } 147 148 void setHasNonRISpills() { HasNonRISpills = true; } 149 bool hasNonRISpills() const { return HasNonRISpills; } 150 151 void setSpillsCR() { SpillsCR = true; } 152 bool isCRSpilled() const { return SpillsCR; } 153 154 void setSpillsVRSAVE() { SpillsVRSAVE = true; } 155 bool isVRSAVESpilled() const { return SpillsVRSAVE; } 156 157 void setLRStoreRequired() { LRStoreRequired = true; } 158 bool isLRStoreRequired() const { return LRStoreRequired; } 159 160 void setUsesTOCBasePtr() { UsesTOCBasePtr = true; } 161 bool usesTOCBasePtr() const { return UsesTOCBasePtr; } 162 163 void setHasFastCall() { HasFastCall = true; } 164 bool hasFastCall() const { return HasFastCall;} 165 166 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 167 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } 168 169 int getVarArgsStackOffset() const { return VarArgsStackOffset; } 170 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; } 171 172 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; } 173 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; } 174 175 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; } 176 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; } 177 178 int getCRSpillFrameIndex() const { return CRSpillFrameIndex; } 179 void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; } 180 181 const SmallVectorImpl<unsigned> & 182 getMustSaveCRs() const { return MustSaveCRs; } 183 void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); } 184 185 void setUsesPICBase(bool uses) { UsesPICBase = uses; } 186 bool usesPICBase() const { return UsesPICBase; } 187 188 bool isSplitCSR() const { return IsSplitCSR; } 189 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 190 191 MCSymbol *getPICOffsetSymbol() const; 192 193 MCSymbol *getGlobalEPSymbol() const; 194 MCSymbol *getLocalEPSymbol() const; 195 MCSymbol *getTOCOffsetSymbol() const; 196 }; 197 198 } // end namespace llvm 199 200 #endif // LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 201