1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- 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 the PowerPC specific subclass of MachineFunctionInfo. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 14 #define LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 15 16 #include "llvm/ADT/SmallVector.h" 17 #include "llvm/CodeGen/MachineFunction.h" 18 #include "llvm/CodeGen/TargetCallingConv.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 = false; 46 47 /// MustSaveTOC - Indicates that the TOC save needs to be performed in the 48 /// prologue of the function. This is typically the case when there are 49 /// indirect calls in the function and it is more profitable to save the 50 /// TOC pointer in the prologue than in the block(s) containing the call(s). 51 bool MustSaveTOC = false; 52 53 /// Do we have to disable shrink-wrapping? This has to be set if we emit any 54 /// instructions that clobber LR in the entry block because discovering this 55 /// in PEI is too late (happens after shrink-wrapping); 56 bool ShrinkWrapDisabled = false; 57 58 /// Does this function have any stack spills. 59 bool HasSpills = false; 60 61 /// Does this function spill using instructions with only r+r (not r+i) 62 /// forms. 63 bool HasNonRISpills = false; 64 65 /// SpillsCR - Indicates whether CR is spilled in the current function. 66 bool SpillsCR = false; 67 68 /// Indicates whether VRSAVE is spilled in the current function. 69 bool SpillsVRSAVE = false; 70 71 /// LRStoreRequired - The bool indicates whether there is some explicit use of 72 /// the LR/LR8 stack slot that is not obvious from scanning the code. This 73 /// requires that the code generator produce a store of LR to the stack on 74 /// entry, even though LR may otherwise apparently not be used. 75 bool LRStoreRequired = false; 76 77 /// This function makes use of the PPC64 ELF TOC base pointer (register r2). 78 bool UsesTOCBasePtr = false; 79 80 /// MinReservedArea - This is the frame size that is at least reserved in a 81 /// potential caller (parameter+linkage area). 82 unsigned MinReservedArea = 0; 83 84 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum 85 /// amount the stack pointer is adjusted to make the frame bigger for tail 86 /// calls. Used for creating an area before the register spill area. 87 int TailCallSPDelta = 0; 88 89 /// HasFastCall - Does this function contain a fast call. Used to determine 90 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc). 91 bool HasFastCall = false; 92 93 /// VarArgsFrameIndex - FrameIndex for start of varargs area. 94 int VarArgsFrameIndex = 0; 95 96 /// VarArgsStackOffset - StackOffset for start of stack 97 /// arguments. 98 99 int VarArgsStackOffset = 0; 100 101 /// VarArgsNumGPR - Index of the first unused integer 102 /// register for parameter passing. 103 unsigned VarArgsNumGPR = 0; 104 105 /// VarArgsNumFPR - Index of the first unused double 106 /// register for parameter passing. 107 unsigned VarArgsNumFPR = 0; 108 109 /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4. 110 int CRSpillFrameIndex = 0; 111 112 /// If any of CR[2-4] need to be saved in the prologue and restored in the 113 /// epilogue then they are added to this array. This is used for the 114 /// 64-bit SVR4 ABI. 115 SmallVector<unsigned, 3> MustSaveCRs; 116 117 /// Hold onto our MachineFunction context. 118 MachineFunction &MF; 119 120 /// Whether this uses the PIC Base register or not. 121 bool UsesPICBase = false; 122 123 /// True if this function has a subset of CSRs that is handled explicitly via 124 /// copies 125 bool IsSplitCSR = false; 126 127 /// We keep track attributes for each live-in virtual registers 128 /// to use SExt/ZExt flags in later optimization. 129 std::vector<std::pair<unsigned, ISD::ArgFlagsTy>> LiveInAttrs; 130 131 public: 132 explicit PPCFunctionInfo(MachineFunction &MF) : MF(MF) {} 133 134 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; } 135 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; } 136 137 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; } 138 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; } 139 140 int getBasePointerSaveIndex() const { return BasePointerSaveIndex; } 141 void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; } 142 143 int getPICBasePointerSaveIndex() const { return PICBasePointerSaveIndex; } 144 void setPICBasePointerSaveIndex(int Idx) { PICBasePointerSaveIndex = Idx; } 145 146 unsigned getMinReservedArea() const { return MinReservedArea; } 147 void setMinReservedArea(unsigned size) { MinReservedArea = size; } 148 149 int getTailCallSPDelta() const { return TailCallSPDelta; } 150 void setTailCallSPDelta(int size) { TailCallSPDelta = size; } 151 152 /// MustSaveLR - This is set when the prolog/epilog inserter does its initial 153 /// scan of the function. It is true if the LR/LR8 register is ever explicitly 154 /// defined/clobbered in the machine function (e.g. by calls and movpctolr, 155 /// which is used in PIC generation), or if the LR stack slot is explicitly 156 /// referenced by builtin_return_address. 157 void setMustSaveLR(bool U) { MustSaveLR = U; } 158 bool mustSaveLR() const { return MustSaveLR; } 159 160 void setMustSaveTOC(bool U) { MustSaveTOC = U; } 161 bool mustSaveTOC() const { return MustSaveTOC; } 162 163 /// We certainly don't want to shrink wrap functions if we've emitted a 164 /// MovePCtoLR8 as that has to go into the entry, so the prologue definitely 165 /// has to go into the entry block. 166 void setShrinkWrapDisabled(bool U) { ShrinkWrapDisabled = U; } 167 bool shrinkWrapDisabled() const { return ShrinkWrapDisabled; } 168 169 void setHasSpills() { HasSpills = true; } 170 bool hasSpills() const { return HasSpills; } 171 172 void setHasNonRISpills() { HasNonRISpills = true; } 173 bool hasNonRISpills() const { return HasNonRISpills; } 174 175 void setSpillsCR() { SpillsCR = true; } 176 bool isCRSpilled() const { return SpillsCR; } 177 178 void setSpillsVRSAVE() { SpillsVRSAVE = true; } 179 bool isVRSAVESpilled() const { return SpillsVRSAVE; } 180 181 void setLRStoreRequired() { LRStoreRequired = true; } 182 bool isLRStoreRequired() const { return LRStoreRequired; } 183 184 void setUsesTOCBasePtr() { UsesTOCBasePtr = true; } 185 bool usesTOCBasePtr() const { return UsesTOCBasePtr; } 186 187 void setHasFastCall() { HasFastCall = true; } 188 bool hasFastCall() const { return HasFastCall;} 189 190 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } 191 void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } 192 193 int getVarArgsStackOffset() const { return VarArgsStackOffset; } 194 void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; } 195 196 unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; } 197 void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; } 198 199 unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; } 200 void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; } 201 202 /// This function associates attributes for each live-in virtual register. 203 void addLiveInAttr(unsigned VReg, ISD::ArgFlagsTy Flags) { 204 LiveInAttrs.push_back(std::make_pair(VReg, Flags)); 205 } 206 207 /// This function returns true if the specified vreg is 208 /// a live-in register and sign-extended. 209 bool isLiveInSExt(unsigned VReg) const; 210 211 /// This function returns true if the specified vreg is 212 /// a live-in register and zero-extended. 213 bool isLiveInZExt(unsigned VReg) const; 214 215 int getCRSpillFrameIndex() const { return CRSpillFrameIndex; } 216 void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; } 217 218 const SmallVectorImpl<unsigned> & 219 getMustSaveCRs() const { return MustSaveCRs; } 220 void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); } 221 222 void setUsesPICBase(bool uses) { UsesPICBase = uses; } 223 bool usesPICBase() const { return UsesPICBase; } 224 225 bool isSplitCSR() const { return IsSplitCSR; } 226 void setIsSplitCSR(bool s) { IsSplitCSR = s; } 227 228 MCSymbol *getPICOffsetSymbol() const; 229 230 MCSymbol *getGlobalEPSymbol() const; 231 MCSymbol *getLocalEPSymbol() const; 232 MCSymbol *getTOCOffsetSymbol() const; 233 }; 234 235 } // end namespace llvm 236 237 #endif // LLVM_LIB_TARGET_POWERPC_PPCMACHINEFUNCTIONINFO_H 238