1 //===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- 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 implements the PseudoSourceValue class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/CodeGen/PseudoSourceValue.h" 14 #include "llvm/CodeGen/MachineFrameInfo.h" 15 #include "llvm/CodeGen/PseudoSourceValueManager.h" 16 #include "llvm/Support/ErrorHandling.h" 17 #include "llvm/Support/raw_ostream.h" 18 #include "llvm/Target/TargetMachine.h" 19 20 using namespace llvm; 21 22 static const char *const PSVNames[] = { 23 "Stack", "GOT", "JumpTable", "ConstantPool", "FixedStack", 24 "GlobalValueCallEntry", "ExternalSymbolCallEntry"}; 25 26 PseudoSourceValue::PseudoSourceValue(unsigned Kind, const TargetMachine &TM) 27 : Kind(Kind) { 28 AddressSpace = TM.getAddressSpaceForPseudoSourceKind(Kind); 29 } 30 31 PseudoSourceValue::~PseudoSourceValue() = default; 32 33 void PseudoSourceValue::printCustom(raw_ostream &O) const { 34 if (Kind < TargetCustom) 35 O << PSVNames[Kind]; 36 else 37 O << "TargetCustom" << Kind; 38 } 39 40 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const { 41 if (isStack()) 42 return false; 43 if (isGOT() || isConstantPool() || isJumpTable()) 44 return true; 45 llvm_unreachable("Unknown PseudoSourceValue!"); 46 } 47 48 bool PseudoSourceValue::isAliased(const MachineFrameInfo *) const { 49 if (isStack() || isGOT() || isConstantPool() || isJumpTable()) 50 return false; 51 llvm_unreachable("Unknown PseudoSourceValue!"); 52 } 53 54 bool PseudoSourceValue::mayAlias(const MachineFrameInfo *) const { 55 return !(isGOT() || isConstantPool() || isJumpTable()); 56 } 57 58 bool FixedStackPseudoSourceValue::isConstant( 59 const MachineFrameInfo *MFI) const { 60 return MFI && MFI->isImmutableObjectIndex(FI); 61 } 62 63 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const { 64 if (!MFI) 65 return true; 66 return MFI->isAliasedObjectIndex(FI); 67 } 68 69 bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const { 70 if (!MFI) 71 return true; 72 // Spill slots will not alias any LLVM IR value. 73 return !MFI->isSpillSlotObjectIndex(FI); 74 } 75 76 void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const { 77 OS << "FixedStack" << FI; 78 } 79 80 CallEntryPseudoSourceValue::CallEntryPseudoSourceValue(unsigned Kind, 81 const TargetMachine &TM) 82 : PseudoSourceValue(Kind, TM) {} 83 84 bool CallEntryPseudoSourceValue::isConstant(const MachineFrameInfo *) const { 85 return false; 86 } 87 88 bool CallEntryPseudoSourceValue::isAliased(const MachineFrameInfo *) const { 89 return false; 90 } 91 92 bool CallEntryPseudoSourceValue::mayAlias(const MachineFrameInfo *) const { 93 return false; 94 } 95 96 GlobalValuePseudoSourceValue::GlobalValuePseudoSourceValue( 97 const GlobalValue *GV, const TargetMachine &TM) 98 : CallEntryPseudoSourceValue(GlobalValueCallEntry, TM), GV(GV) {} 99 ExternalSymbolPseudoSourceValue::ExternalSymbolPseudoSourceValue( 100 const char *ES, const TargetMachine &TM) 101 : CallEntryPseudoSourceValue(ExternalSymbolCallEntry, TM), ES(ES) {} 102 103 PseudoSourceValueManager::PseudoSourceValueManager(const TargetMachine &TMInfo) 104 : TM(TMInfo), StackPSV(PseudoSourceValue::Stack, TM), 105 GOTPSV(PseudoSourceValue::GOT, TM), 106 JumpTablePSV(PseudoSourceValue::JumpTable, TM), 107 ConstantPoolPSV(PseudoSourceValue::ConstantPool, TM) {} 108 109 const PseudoSourceValue *PseudoSourceValueManager::getStack() { 110 return &StackPSV; 111 } 112 113 const PseudoSourceValue *PseudoSourceValueManager::getGOT() { return &GOTPSV; } 114 115 const PseudoSourceValue *PseudoSourceValueManager::getConstantPool() { 116 return &ConstantPoolPSV; 117 } 118 119 const PseudoSourceValue *PseudoSourceValueManager::getJumpTable() { 120 return &JumpTablePSV; 121 } 122 123 const PseudoSourceValue * 124 PseudoSourceValueManager::getFixedStack(int FI) { 125 std::unique_ptr<FixedStackPseudoSourceValue> &V = FSValues[FI]; 126 if (!V) 127 V = std::make_unique<FixedStackPseudoSourceValue>(FI, TM); 128 return V.get(); 129 } 130 131 const PseudoSourceValue * 132 PseudoSourceValueManager::getGlobalValueCallEntry(const GlobalValue *GV) { 133 std::unique_ptr<const GlobalValuePseudoSourceValue> &E = 134 GlobalCallEntries[GV]; 135 if (!E) 136 E = std::make_unique<GlobalValuePseudoSourceValue>(GV, TM); 137 return E.get(); 138 } 139 140 const PseudoSourceValue * 141 PseudoSourceValueManager::getExternalSymbolCallEntry(const char *ES) { 142 std::unique_ptr<const ExternalSymbolPseudoSourceValue> &E = 143 ExternalCallEntries[ES]; 144 if (!E) 145 E = std::make_unique<ExternalSymbolPseudoSourceValue>(ES, TM); 146 return E.get(); 147 } 148