1 //===- LLVMContextImpl.cpp - Implement LLVMContextImpl --------------------===// 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 opaque LLVMContextImpl. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "LLVMContextImpl.h" 14 #include "AttributeImpl.h" 15 #include "llvm/ADT/SetVector.h" 16 #include "llvm/ADT/StringMapEntry.h" 17 #include "llvm/ADT/iterator.h" 18 #include "llvm/ADT/iterator_range.h" 19 #include "llvm/IR/DiagnosticHandler.h" 20 #include "llvm/IR/LLVMRemarkStreamer.h" 21 #include "llvm/IR/Module.h" 22 #include "llvm/IR/OptBisect.h" 23 #include "llvm/IR/Type.h" 24 #include "llvm/IR/Use.h" 25 #include "llvm/IR/User.h" 26 #include "llvm/Remarks/RemarkStreamer.h" 27 #include "llvm/Support/CommandLine.h" 28 #include "llvm/Support/Compiler.h" 29 #include "llvm/Support/ErrorHandling.h" 30 #include "llvm/Support/TypeSize.h" 31 #include <cassert> 32 #include <utility> 33 34 using namespace llvm; 35 36 static cl::opt<bool> 37 OpaquePointersCL("opaque-pointers", cl::desc("Use opaque pointers"), 38 cl::init(true)); 39 40 LLVMContextImpl::LLVMContextImpl(LLVMContext &C) 41 : DiagHandler(std::make_unique<DiagnosticHandler>()), 42 VoidTy(C, Type::VoidTyID), LabelTy(C, Type::LabelTyID), 43 HalfTy(C, Type::HalfTyID), BFloatTy(C, Type::BFloatTyID), 44 FloatTy(C, Type::FloatTyID), DoubleTy(C, Type::DoubleTyID), 45 MetadataTy(C, Type::MetadataTyID), TokenTy(C, Type::TokenTyID), 46 X86_FP80Ty(C, Type::X86_FP80TyID), FP128Ty(C, Type::FP128TyID), 47 PPC_FP128Ty(C, Type::PPC_FP128TyID), X86_MMXTy(C, Type::X86_MMXTyID), 48 X86_AMXTy(C, Type::X86_AMXTyID), Int1Ty(C, 1), Int8Ty(C, 8), 49 Int16Ty(C, 16), Int32Ty(C, 32), Int64Ty(C, 64), Int128Ty(C, 128) { 50 if (OpaquePointersCL.getNumOccurrences()) { 51 OpaquePointers = OpaquePointersCL; 52 } 53 } 54 55 LLVMContextImpl::~LLVMContextImpl() { 56 // NOTE: We need to delete the contents of OwnedModules, but Module's dtor 57 // will call LLVMContextImpl::removeModule, thus invalidating iterators into 58 // the container. Avoid iterators during this operation: 59 while (!OwnedModules.empty()) 60 delete *OwnedModules.begin(); 61 62 #ifndef NDEBUG 63 // Check for metadata references from leaked Values. 64 for (auto &Pair : ValueMetadata) 65 Pair.first->dump(); 66 assert(ValueMetadata.empty() && "Values with metadata have been leaked"); 67 #endif 68 69 // Drop references for MDNodes. Do this before Values get deleted to avoid 70 // unnecessary RAUW when nodes are still unresolved. 71 for (auto *I : DistinctMDNodes) { 72 // We may have DIArgList that were uniqued, and as it has a custom 73 // implementation of dropAllReferences, it needs to be explicitly invoked. 74 if (auto *AL = dyn_cast<DIArgList>(I)) { 75 AL->dropAllReferences(); 76 continue; 77 } 78 I->dropAllReferences(); 79 } 80 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \ 81 for (auto *I : CLASS##s) \ 82 I->dropAllReferences(); 83 #include "llvm/IR/Metadata.def" 84 85 // Also drop references that come from the Value bridges. 86 for (auto &Pair : ValuesAsMetadata) 87 Pair.second->dropUsers(); 88 for (auto &Pair : MetadataAsValues) 89 Pair.second->dropUse(); 90 91 // Destroy MDNodes. 92 for (MDNode *I : DistinctMDNodes) 93 I->deleteAsSubclass(); 94 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \ 95 for (CLASS * I : CLASS##s) \ 96 delete I; 97 #include "llvm/IR/Metadata.def" 98 99 // Free the constants. 100 for (auto *I : ExprConstants) 101 I->dropAllReferences(); 102 for (auto *I : ArrayConstants) 103 I->dropAllReferences(); 104 for (auto *I : StructConstants) 105 I->dropAllReferences(); 106 for (auto *I : VectorConstants) 107 I->dropAllReferences(); 108 ExprConstants.freeConstants(); 109 ArrayConstants.freeConstants(); 110 StructConstants.freeConstants(); 111 VectorConstants.freeConstants(); 112 InlineAsms.freeConstants(); 113 114 CAZConstants.clear(); 115 CPNConstants.clear(); 116 CTNConstants.clear(); 117 UVConstants.clear(); 118 PVConstants.clear(); 119 IntConstants.clear(); 120 FPConstants.clear(); 121 CDSConstants.clear(); 122 123 // Destroy attribute node lists. 124 for (FoldingSetIterator<AttributeSetNode> I = AttrsSetNodes.begin(), 125 E = AttrsSetNodes.end(); I != E; ) { 126 FoldingSetIterator<AttributeSetNode> Elem = I++; 127 delete &*Elem; 128 } 129 130 // Destroy MetadataAsValues. 131 { 132 SmallVector<MetadataAsValue *, 8> MDVs; 133 MDVs.reserve(MetadataAsValues.size()); 134 for (auto &Pair : MetadataAsValues) 135 MDVs.push_back(Pair.second); 136 MetadataAsValues.clear(); 137 for (auto *V : MDVs) 138 delete V; 139 } 140 141 // Destroy ValuesAsMetadata. 142 for (auto &Pair : ValuesAsMetadata) 143 delete Pair.second; 144 } 145 146 void LLVMContextImpl::dropTriviallyDeadConstantArrays() { 147 SmallSetVector<ConstantArray *, 4> WorkList; 148 149 // When ArrayConstants are of substantial size and only a few in them are 150 // dead, starting WorkList with all elements of ArrayConstants can be 151 // wasteful. Instead, starting WorkList with only elements that have empty 152 // uses. 153 for (ConstantArray *C : ArrayConstants) 154 if (C->use_empty()) 155 WorkList.insert(C); 156 157 while (!WorkList.empty()) { 158 ConstantArray *C = WorkList.pop_back_val(); 159 if (C->use_empty()) { 160 for (const Use &Op : C->operands()) { 161 if (auto *COp = dyn_cast<ConstantArray>(Op)) 162 WorkList.insert(COp); 163 } 164 C->destroyConstant(); 165 } 166 } 167 } 168 169 void Module::dropTriviallyDeadConstantArrays() { 170 Context.pImpl->dropTriviallyDeadConstantArrays(); 171 } 172 173 namespace llvm { 174 175 /// Make MDOperand transparent for hashing. 176 /// 177 /// This overload of an implementation detail of the hashing library makes 178 /// MDOperand hash to the same value as a \a Metadata pointer. 179 /// 180 /// Note that overloading \a hash_value() as follows: 181 /// 182 /// \code 183 /// size_t hash_value(const MDOperand &X) { return hash_value(X.get()); } 184 /// \endcode 185 /// 186 /// does not cause MDOperand to be transparent. In particular, a bare pointer 187 /// doesn't get hashed before it's combined, whereas \a MDOperand would. 188 static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); } 189 190 } // end namespace llvm 191 192 unsigned MDNodeOpsKey::calculateHash(MDNode *N, unsigned Offset) { 193 unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end()); 194 #ifndef NDEBUG 195 { 196 SmallVector<Metadata *, 8> MDs(drop_begin(N->operands(), Offset)); 197 unsigned RawHash = calculateHash(MDs); 198 assert(Hash == RawHash && 199 "Expected hash of MDOperand to equal hash of Metadata*"); 200 } 201 #endif 202 return Hash; 203 } 204 205 unsigned MDNodeOpsKey::calculateHash(ArrayRef<Metadata *> Ops) { 206 return hash_combine_range(Ops.begin(), Ops.end()); 207 } 208 209 StringMapEntry<uint32_t> *LLVMContextImpl::getOrInsertBundleTag(StringRef Tag) { 210 uint32_t NewIdx = BundleTagCache.size(); 211 return &*(BundleTagCache.insert(std::make_pair(Tag, NewIdx)).first); 212 } 213 214 void LLVMContextImpl::getOperandBundleTags(SmallVectorImpl<StringRef> &Tags) const { 215 Tags.resize(BundleTagCache.size()); 216 for (const auto &T : BundleTagCache) 217 Tags[T.second] = T.first(); 218 } 219 220 uint32_t LLVMContextImpl::getOperandBundleTagID(StringRef Tag) const { 221 auto I = BundleTagCache.find(Tag); 222 assert(I != BundleTagCache.end() && "Unknown tag!"); 223 return I->second; 224 } 225 226 SyncScope::ID LLVMContextImpl::getOrInsertSyncScopeID(StringRef SSN) { 227 auto NewSSID = SSC.size(); 228 assert(NewSSID < std::numeric_limits<SyncScope::ID>::max() && 229 "Hit the maximum number of synchronization scopes allowed!"); 230 return SSC.insert(std::make_pair(SSN, SyncScope::ID(NewSSID))).first->second; 231 } 232 233 void LLVMContextImpl::getSyncScopeNames( 234 SmallVectorImpl<StringRef> &SSNs) const { 235 SSNs.resize(SSC.size()); 236 for (const auto &SSE : SSC) 237 SSNs[SSE.second] = SSE.first(); 238 } 239 240 /// Gets the OptPassGate for this LLVMContextImpl, which defaults to the 241 /// singleton OptBisect if not explicitly set. 242 OptPassGate &LLVMContextImpl::getOptPassGate() const { 243 if (!OPG) 244 OPG = &getGlobalPassGate(); 245 return *OPG; 246 } 247 248 void LLVMContextImpl::setOptPassGate(OptPassGate& OPG) { 249 this->OPG = &OPG; 250 } 251 252 bool LLVMContextImpl::getOpaquePointers() { 253 if (LLVM_UNLIKELY(!OpaquePointers)) 254 OpaquePointers = OpaquePointersCL; 255 return *OpaquePointers; 256 } 257 258 void LLVMContextImpl::setOpaquePointers(bool OP) { 259 assert((!OpaquePointers || *OpaquePointers == OP) && 260 "Cannot change opaque pointers mode once set"); 261 OpaquePointers = OP; 262 } 263