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1 //===- LLVMContextImpl.cpp - Implement LLVMContextImpl --------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the opaque LLVMContextImpl.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "LLVMContextImpl.h"
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14 #include "llvm/ADT/SetVector.h"
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15 #include "llvm/IR/Module.h"
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16 #include "llvm/IR/OptBisect.h"
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17 #include "llvm/IR/Type.h"
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223
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18 #include "llvm/Support/CommandLine.h"
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150
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19 #include "llvm/Support/ManagedStatic.h"
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20 #include <cassert>
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21 #include <utility>
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22
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23 using namespace llvm;
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24
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223
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25 static cl::opt<bool>
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26 ForceOpaquePointersCL("force-opaque-pointers",
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27 cl::desc("Force all pointers to be opaque pointers"),
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28 cl::init(false));
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29
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150
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30 LLVMContextImpl::LLVMContextImpl(LLVMContext &C)
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223
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31 : DiagHandler(std::make_unique<DiagnosticHandler>()),
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32 VoidTy(C, Type::VoidTyID), LabelTy(C, Type::LabelTyID),
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33 HalfTy(C, Type::HalfTyID), BFloatTy(C, Type::BFloatTyID),
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34 FloatTy(C, Type::FloatTyID), DoubleTy(C, Type::DoubleTyID),
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35 MetadataTy(C, Type::MetadataTyID), TokenTy(C, Type::TokenTyID),
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36 X86_FP80Ty(C, Type::X86_FP80TyID), FP128Ty(C, Type::FP128TyID),
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37 PPC_FP128Ty(C, Type::PPC_FP128TyID), X86_MMXTy(C, Type::X86_MMXTyID),
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38 X86_AMXTy(C, Type::X86_AMXTyID), Int1Ty(C, 1), Int8Ty(C, 8),
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39 Int16Ty(C, 16), Int32Ty(C, 32), Int64Ty(C, 64), Int128Ty(C, 128),
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40 ForceOpaquePointers(ForceOpaquePointersCL) {}
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150
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41
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42 LLVMContextImpl::~LLVMContextImpl() {
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43 // NOTE: We need to delete the contents of OwnedModules, but Module's dtor
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44 // will call LLVMContextImpl::removeModule, thus invalidating iterators into
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45 // the container. Avoid iterators during this operation:
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46 while (!OwnedModules.empty())
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47 delete *OwnedModules.begin();
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48
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49 #ifndef NDEBUG
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221
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50 // Check for metadata references from leaked Values.
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51 for (auto &Pair : ValueMetadata)
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150
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52 Pair.first->dump();
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221
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53 assert(ValueMetadata.empty() && "Values with metadata have been leaked");
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150
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54 #endif
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55
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56 // Drop references for MDNodes. Do this before Values get deleted to avoid
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57 // unnecessary RAUW when nodes are still unresolved.
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58 for (auto *I : DistinctMDNodes)
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59 I->dropAllReferences();
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60 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \
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61 for (auto *I : CLASS##s) \
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62 I->dropAllReferences();
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63 #include "llvm/IR/Metadata.def"
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64
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65 // Also drop references that come from the Value bridges.
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66 for (auto &Pair : ValuesAsMetadata)
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67 Pair.second->dropUsers();
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68 for (auto &Pair : MetadataAsValues)
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69 Pair.second->dropUse();
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70
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71 // Destroy MDNodes.
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72 for (MDNode *I : DistinctMDNodes)
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73 I->deleteAsSubclass();
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74 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \
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75 for (CLASS * I : CLASS##s) \
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76 delete I;
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77 #include "llvm/IR/Metadata.def"
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78
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79 // Free the constants.
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80 for (auto *I : ExprConstants)
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81 I->dropAllReferences();
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82 for (auto *I : ArrayConstants)
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83 I->dropAllReferences();
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84 for (auto *I : StructConstants)
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85 I->dropAllReferences();
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86 for (auto *I : VectorConstants)
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87 I->dropAllReferences();
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88 ExprConstants.freeConstants();
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89 ArrayConstants.freeConstants();
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90 StructConstants.freeConstants();
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91 VectorConstants.freeConstants();
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92 InlineAsms.freeConstants();
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93
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94 CAZConstants.clear();
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95 CPNConstants.clear();
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96 UVConstants.clear();
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221
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97 PVConstants.clear();
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150
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98 IntConstants.clear();
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99 FPConstants.clear();
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100 CDSConstants.clear();
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101
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102 // Destroy attribute node lists.
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103 for (FoldingSetIterator<AttributeSetNode> I = AttrsSetNodes.begin(),
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104 E = AttrsSetNodes.end(); I != E; ) {
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105 FoldingSetIterator<AttributeSetNode> Elem = I++;
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106 delete &*Elem;
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107 }
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108
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109 // Destroy MetadataAsValues.
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110 {
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111 SmallVector<MetadataAsValue *, 8> MDVs;
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112 MDVs.reserve(MetadataAsValues.size());
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113 for (auto &Pair : MetadataAsValues)
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114 MDVs.push_back(Pair.second);
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115 MetadataAsValues.clear();
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116 for (auto *V : MDVs)
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117 delete V;
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118 }
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119
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120 // Destroy ValuesAsMetadata.
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121 for (auto &Pair : ValuesAsMetadata)
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122 delete Pair.second;
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123 }
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124
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125 void LLVMContextImpl::dropTriviallyDeadConstantArrays() {
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221
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126 SmallSetVector<ConstantArray *, 4> WorkList;
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127
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128 // When ArrayConstants are of substantial size and only a few in them are
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129 // dead, starting WorkList with all elements of ArrayConstants can be
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130 // wasteful. Instead, starting WorkList with only elements that have empty
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131 // uses.
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132 for (ConstantArray *C : ArrayConstants)
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133 if (C->use_empty())
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134 WorkList.insert(C);
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150
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135
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136 while (!WorkList.empty()) {
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137 ConstantArray *C = WorkList.pop_back_val();
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138 if (C->use_empty()) {
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139 for (const Use &Op : C->operands()) {
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140 if (auto *COp = dyn_cast<ConstantArray>(Op))
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141 WorkList.insert(COp);
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142 }
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143 C->destroyConstant();
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144 }
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145 }
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146 }
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147
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148 void Module::dropTriviallyDeadConstantArrays() {
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149 Context.pImpl->dropTriviallyDeadConstantArrays();
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150 }
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151
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152 namespace llvm {
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153
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154 /// Make MDOperand transparent for hashing.
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155 ///
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156 /// This overload of an implementation detail of the hashing library makes
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157 /// MDOperand hash to the same value as a \a Metadata pointer.
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158 ///
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159 /// Note that overloading \a hash_value() as follows:
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160 ///
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161 /// \code
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162 /// size_t hash_value(const MDOperand &X) { return hash_value(X.get()); }
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163 /// \endcode
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164 ///
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165 /// does not cause MDOperand to be transparent. In particular, a bare pointer
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166 /// doesn't get hashed before it's combined, whereas \a MDOperand would.
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167 static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
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168
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169 } // end namespace llvm
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170
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171 unsigned MDNodeOpsKey::calculateHash(MDNode *N, unsigned Offset) {
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172 unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end());
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173 #ifndef NDEBUG
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174 {
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221
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175 SmallVector<Metadata *, 8> MDs(drop_begin(N->operands(), Offset));
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150
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176 unsigned RawHash = calculateHash(MDs);
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177 assert(Hash == RawHash &&
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178 "Expected hash of MDOperand to equal hash of Metadata*");
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179 }
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180 #endif
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181 return Hash;
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182 }
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183
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184 unsigned MDNodeOpsKey::calculateHash(ArrayRef<Metadata *> Ops) {
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185 return hash_combine_range(Ops.begin(), Ops.end());
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186 }
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187
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188 StringMapEntry<uint32_t> *LLVMContextImpl::getOrInsertBundleTag(StringRef Tag) {
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189 uint32_t NewIdx = BundleTagCache.size();
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190 return &*(BundleTagCache.insert(std::make_pair(Tag, NewIdx)).first);
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191 }
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192
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193 void LLVMContextImpl::getOperandBundleTags(SmallVectorImpl<StringRef> &Tags) const {
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194 Tags.resize(BundleTagCache.size());
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195 for (const auto &T : BundleTagCache)
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196 Tags[T.second] = T.first();
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197 }
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198
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199 uint32_t LLVMContextImpl::getOperandBundleTagID(StringRef Tag) const {
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200 auto I = BundleTagCache.find(Tag);
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201 assert(I != BundleTagCache.end() && "Unknown tag!");
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202 return I->second;
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203 }
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204
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205 SyncScope::ID LLVMContextImpl::getOrInsertSyncScopeID(StringRef SSN) {
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206 auto NewSSID = SSC.size();
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207 assert(NewSSID < std::numeric_limits<SyncScope::ID>::max() &&
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208 "Hit the maximum number of synchronization scopes allowed!");
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209 return SSC.insert(std::make_pair(SSN, SyncScope::ID(NewSSID))).first->second;
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210 }
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211
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212 void LLVMContextImpl::getSyncScopeNames(
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213 SmallVectorImpl<StringRef> &SSNs) const {
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214 SSNs.resize(SSC.size());
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215 for (const auto &SSE : SSC)
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216 SSNs[SSE.second] = SSE.first();
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217 }
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218
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221
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219 /// Gets the OptPassGate for this LLVMContextImpl, which defaults to the
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220 /// singleton OptBisect if not explicitly set.
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150
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221 OptPassGate &LLVMContextImpl::getOptPassGate() const {
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222 if (!OPG)
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223 OPG = &(*OptBisector);
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224 return *OPG;
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225 }
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226
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227 void LLVMContextImpl::setOptPassGate(OptPassGate& OPG) {
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228 this->OPG = &OPG;
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229 }
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