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/CodeGen/MachineFunction.h" 18 19 namespace llvm { 20 21 /// PPCFunctionInfo - This class is derived from MachineFunction private 22 /// PowerPC target-specific information for each MachineFunction. 23 class PPCFunctionInfo : public MachineFunctionInfo { 24 virtual void anchor(); 25 26 /// FramePointerSaveIndex - Frame index of where the old frame pointer is 27 /// stored. Also used as an anchor for instructions that need to be altered 28 /// when using frame pointers (dyna_add, dyna_sub.) 29 int FramePointerSaveIndex; 30 31 /// ReturnAddrSaveIndex - Frame index of where the return address is stored. 32 /// 33 int ReturnAddrSaveIndex; 34 35 /// Frame index where the old base pointer is stored. 36 int BasePointerSaveIndex; 37 38 /// Frame index where the old PIC base pointer is stored. 39 int PICBasePointerSaveIndex; 40 41 /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current 42 /// function. This is only valid after the initial scan of the function by 43 /// PEI. 44 bool MustSaveLR; 45 46 /// Does this function have any stack spills. 47 bool HasSpills; 48 49 /// Does this function spill using instructions with only r+r (not r+i) 50 /// forms. 51 bool HasNonRISpills; 52 53 /// SpillsCR - Indicates whether CR is spilled in the current function. 54 bool SpillsCR; 55 56 /// Indicates whether VRSAVE is spilled in the current function. 57 bool SpillsVRSAVE; 58 59 /// LRStoreRequired - The bool indicates whether there is some explicit use of 60 /// the LR/LR8 stack slot that is not obvious from scanning the code. This 61 /// requires that the code generator produce a store of LR to the stack on 62 /// entry, even though LR may otherwise apparently not be used. 63 bool LRStoreRequired; 64 65 /// This function makes use of the PPC64 ELF TOC base pointer (register r2). 66 bool UsesTOCBasePtr; 67 68 /// MinReservedArea - This is the frame size that is at least reserved in a 69 /// potential caller (parameter+linkage area). 70 unsigned MinReservedArea; 71 72 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum 73 /// amount the stack pointer is adjusted to make the frame bigger for tail 74 /// calls. Used for creating an area before the register spill area. 75 int TailCallSPDelta; 76 77 /// HasFastCall - Does this function contain a fast call. Used to determine 78 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc). 79 bool HasFastCall; 80 81 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 82 int VarArgsFrameIndex; 83 /// VarArgsStackOffset - StackOffset for start of stack 84 /// arguments. 85 int VarArgsStackOffset; 86 /// VarArgsNumGPR - Index of the first unused integer 87 /// register for parameter passing. 88 unsigned VarArgsNumGPR; 89 /// VarArgsNumFPR - Index of the first unused double 90 /// register for parameter passing. 91 unsigned VarArgsNumFPR; 92 93 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4. 94 int CRSpillFrameIndex; 95 96 /// If any of CR[2-4] need to be saved in the prologue and restored in the 97 /// epilogue then they are added to this array. This is used for the 98 /// 64-bit SVR4 ABI. 99 SmallVector<unsigned, 3> MustSaveCRs; 100 101 /// Hold onto our MachineFunction context. 102 MachineFunction &MF; 103 104 /// Whether this uses the PIC Base register or not. 105 bool UsesPICBase; 106 107 /// True if this function has a subset of CSRs that is handled explicitly via 108 /// copies 109 bool IsSplitCSR; 110 111 public: 112 explicit PPCFunctionInfo(MachineFunction &MF) 113 : FramePointerSaveIndex(0), 114 ReturnAddrSaveIndex(0), 115 BasePointerSaveIndex(0), 116 PICBasePointerSaveIndex(0), 117 HasSpills(false), 118 HasNonRISpills(false), 119 SpillsCR(false), 120 SpillsVRSAVE(false), 121 LRStoreRequired(false), 122 UsesTOCBasePtr(false), 123 MinReservedArea(0), 124 TailCallSPDelta(0), 125 HasFastCall(false), 126 VarArgsFrameIndex(0), 127 VarArgsStackOffset(0), 128 VarArgsNumGPR(0), 129 VarArgsNumFPR(0), 130 CRSpillFrameIndex(0), 131 MF(MF), 132 UsesPICBase(0), 133 IsSplitCSR(false) {} 134 135 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; } 136 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; } 137 138 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; } 139 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; } 140 141 int getBasePointerSaveIndex() const { return BasePointerSaveIndex; } 142 void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; } 143 144 int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex; } 145 void setPICBasePointerSaveIndex(int Idx) { PICBasePointerSaveIndex = Idx; } 146 147 unsigned getMinReservedArea() const { return MinReservedArea; } 148 void setMinReservedArea(unsigned size) { MinReservedArea = size; } 149 150 int getTailCallSPDelta() const { return TailCallSPDelta; } 151 void setTailCallSPDelta(int size) { TailCallSPDelta = size; } 152 153 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial 154 /// scan of the function. It is true if the LR/LR8 register is ever explicitly 155 /// defined/clobbered in the machine function (e.g. by calls and movpctolr, 156 /// which is used in PIC generation), or if the LR stack slot is explicitly 157 /// referenced by builtin_return_address. 158 void setMustSaveLR(bool U) { MustSaveLR = U; } 159 bool mustSaveLR() const { return MustSaveLR; } 160 161 void setHasSpills() { HasSpills = true; } 162 bool hasSpills() const { return HasSpills; } 163 164 void setHasNonRISpills() { HasNonRISpills = true; } 165 bool hasNonRISpills() const { return HasNonRISpills; } 166 167 void setSpillsCR() { SpillsCR = true; } 168 bool isCRSpilled() const { return SpillsCR; } 169 170 void setSpillsVRSAVE() { SpillsVRSAVE = true; } 171 bool isVRSAVESpilled() const { return SpillsVRSAVE; } 172 173 void setLRStoreRequired() { LRStoreRequired = true; } 174 bool isLRStoreRequired() const { return LRStoreRequired; } 175 176 void setUsesTOCBasePtr() { UsesTOCBasePtr = true; } 177 bool usesTOCBasePtr() const { return UsesTOCBasePtr; } 178 179 void setHasFastCall() { HasFastCall = true; } 180 bool hasFastCall() const { return HasFastCall;} 181 182 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 183 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } 184 185 int getVarArgsStackOffset() const { return VarArgsStackOffset; } 186 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; } 187 188 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; } 189 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; } 190 191 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; } 192 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; } 193 194 int getCRSpillFrameIndex() const { return CRSpillFrameIndex; } 195 void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; } 196 197 const SmallVectorImpl<unsigned> & 198 getMustSaveCRs() const { return MustSaveCRs; } 199 void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); } 200 201 void setUsesPICBase(bool uses) { UsesPICBase = uses; } 202 bool usesPICBase() const { return UsesPICBase; } 203 204 bool isSplitCSR() const { return IsSplitCSR; } 205 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 206 207 MCSymbol *getPICOffsetSymbol() const; 208 209 MCSymbol *getGlobalEPSymbol() const; 210 MCSymbol *getLocalEPSymbol() const; 211 MCSymbol *getTOCOffsetSymbol() const; 212 }; 213 214 } // end of namespace llvm 215 216 217 #endif 218
