LLVM  14.0.0git
LLVMContextImpl.cpp
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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 "llvm/ADT/SetVector.h"
15 #include "llvm/IR/Module.h"
16 #include "llvm/IR/OptBisect.h"
17 #include "llvm/IR/Type.h"
20 #include <cassert>
21 #include <utility>
22 
23 using namespace llvm;
24 
25 static cl::opt<bool>
26  OpaquePointersCL("opaque-pointers", cl::desc("Use opaque pointers"),
27  cl::init(false));
28 
30  : DiagHandler(std::make_unique<DiagnosticHandler>()),
31  VoidTy(C, Type::VoidTyID), LabelTy(C, Type::LabelTyID),
32  HalfTy(C, Type::HalfTyID), BFloatTy(C, Type::BFloatTyID),
33  FloatTy(C, Type::FloatTyID), DoubleTy(C, Type::DoubleTyID),
34  MetadataTy(C, Type::MetadataTyID), TokenTy(C, Type::TokenTyID),
35  X86_FP80Ty(C, Type::X86_FP80TyID), FP128Ty(C, Type::FP128TyID),
36  PPC_FP128Ty(C, Type::PPC_FP128TyID), X86_MMXTy(C, Type::X86_MMXTyID),
37  X86_AMXTy(C, Type::X86_AMXTyID), Int1Ty(C, 1), Int8Ty(C, 8),
38  Int16Ty(C, 16), Int32Ty(C, 32), Int64Ty(C, 64), Int128Ty(C, 128),
39  OpaquePointers(OpaquePointersCL) {}
40 
42  // NOTE: We need to delete the contents of OwnedModules, but Module's dtor
43  // will call LLVMContextImpl::removeModule, thus invalidating iterators into
44  // the container. Avoid iterators during this operation:
45  while (!OwnedModules.empty())
46  delete *OwnedModules.begin();
47 
48 #ifndef NDEBUG
49  // Check for metadata references from leaked Values.
50  for (auto &Pair : ValueMetadata)
51  Pair.first->dump();
52  assert(ValueMetadata.empty() && "Values with metadata have been leaked");
53 #endif
54 
55  // Drop references for MDNodes. Do this before Values get deleted to avoid
56  // unnecessary RAUW when nodes are still unresolved.
57  for (auto *I : DistinctMDNodes) {
58  // We may have DIArgList that were uniqued, and as it has a custom
59  // implementation of dropAllReferences, it needs to be explicitly invoked.
60  if (auto *AL = dyn_cast<DIArgList>(I)) {
61  AL->dropAllReferences();
62  continue;
63  }
64  I->dropAllReferences();
65  }
66 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \
67  for (auto *I : CLASS##s) \
68  I->dropAllReferences();
69 #include "llvm/IR/Metadata.def"
70 
71  // Also drop references that come from the Value bridges.
72  for (auto &Pair : ValuesAsMetadata)
73  Pair.second->dropUsers();
74  for (auto &Pair : MetadataAsValues)
75  Pair.second->dropUse();
76 
77  // Destroy MDNodes.
78  for (MDNode *I : DistinctMDNodes)
79  I->deleteAsSubclass();
80 #define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS) \
81  for (CLASS * I : CLASS##s) \
82  delete I;
83 #include "llvm/IR/Metadata.def"
84 
85  // Free the constants.
86  for (auto *I : ExprConstants)
87  I->dropAllReferences();
88  for (auto *I : ArrayConstants)
89  I->dropAllReferences();
90  for (auto *I : StructConstants)
91  I->dropAllReferences();
92  for (auto *I : VectorConstants)
93  I->dropAllReferences();
94  ExprConstants.freeConstants();
98  InlineAsms.freeConstants();
99 
100  CAZConstants.clear();
101  CPNConstants.clear();
102  UVConstants.clear();
103  PVConstants.clear();
105  FPConstants.clear();
106  CDSConstants.clear();
107 
108  // Destroy attribute node lists.
110  E = AttrsSetNodes.end(); I != E; ) {
112  delete &*Elem;
113  }
114 
115  // Destroy MetadataAsValues.
116  {
118  MDVs.reserve(MetadataAsValues.size());
119  for (auto &Pair : MetadataAsValues)
120  MDVs.push_back(Pair.second);
121  MetadataAsValues.clear();
122  for (auto *V : MDVs)
123  delete V;
124  }
125 
126  // Destroy ValuesAsMetadata.
127  for (auto &Pair : ValuesAsMetadata)
128  delete Pair.second;
129 }
130 
133 
134  // When ArrayConstants are of substantial size and only a few in them are
135  // dead, starting WorkList with all elements of ArrayConstants can be
136  // wasteful. Instead, starting WorkList with only elements that have empty
137  // uses.
139  if (C->use_empty())
140  WorkList.insert(C);
141 
142  while (!WorkList.empty()) {
143  ConstantArray *C = WorkList.pop_back_val();
144  if (C->use_empty()) {
145  for (const Use &Op : C->operands()) {
146  if (auto *COp = dyn_cast<ConstantArray>(Op))
147  WorkList.insert(COp);
148  }
149  C->destroyConstant();
150  }
151  }
152 }
153 
156 }
157 
158 namespace llvm {
159 
160 /// Make MDOperand transparent for hashing.
161 ///
162 /// This overload of an implementation detail of the hashing library makes
163 /// MDOperand hash to the same value as a \a Metadata pointer.
164 ///
165 /// Note that overloading \a hash_value() as follows:
166 ///
167 /// \code
168 /// size_t hash_value(const MDOperand &X) { return hash_value(X.get()); }
169 /// \endcode
170 ///
171 /// does not cause MDOperand to be transparent. In particular, a bare pointer
172 /// doesn't get hashed before it's combined, whereas \a MDOperand would.
173 static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
174 
175 } // end namespace llvm
176 
178  unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end());
179 #ifndef NDEBUG
180  {
181  SmallVector<Metadata *, 8> MDs(drop_begin(N->operands(), Offset));
182  unsigned RawHash = calculateHash(MDs);
183  assert(Hash == RawHash &&
184  "Expected hash of MDOperand to equal hash of Metadata*");
185  }
186 #endif
187  return Hash;
188 }
189 
191  return hash_combine_range(Ops.begin(), Ops.end());
192 }
193 
195  uint32_t NewIdx = BundleTagCache.size();
196  return &*(BundleTagCache.insert(std::make_pair(Tag, NewIdx)).first);
197 }
198 
200  Tags.resize(BundleTagCache.size());
201  for (const auto &T : BundleTagCache)
202  Tags[T.second] = T.first();
203 }
204 
206  auto I = BundleTagCache.find(Tag);
207  assert(I != BundleTagCache.end() && "Unknown tag!");
208  return I->second;
209 }
210 
212  auto NewSSID = SSC.size();
214  "Hit the maximum number of synchronization scopes allowed!");
215  return SSC.insert(std::make_pair(SSN, SyncScope::ID(NewSSID))).first->second;
216 }
217 
219  SmallVectorImpl<StringRef> &SSNs) const {
220  SSNs.resize(SSC.size());
221  for (const auto &SSE : SSC)
222  SSNs[SSE.second] = SSE.first();
223 }
224 
225 /// Gets the OptPassGate for this LLVMContextImpl, which defaults to the
226 /// singleton OptBisect if not explicitly set.
228  if (!OPG)
229  OPG = &(*OptBisector);
230  return *OPG;
231 }
232 
234  this->OPG = &OPG;
235 }
llvm::LLVMContextImpl::OwnedModules
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OwnedModules - The set of modules instantiated in this context, and which will be automatically delet...
Definition: LLVMContextImpl.h:1345
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IntegerType * Int32Ty
Definition: NVVMIntrRange.cpp:67
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Definition: LLVMContext.h:70
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Definition: LLVMContextImpl.h:1438
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---------------------— PointerInfo ------------------------------------—
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Definition: Mips16HardFloat.cpp:103
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Return a range covering RangeOrContainer with the first N elements excluded.
Definition: STLExtras.h:266
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FPMapTy FPConstants
Definition: LLVMContextImpl.h:1387
T
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Definition: LLVMContextImpl.h:1425
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Definition: SmallVector.h:1168
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Definition: LLVMContextImpl.h:1436
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Definition: LLVMContextImpl.cpp:233
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Definition: StringMap.h:203
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Definition: Type.h:45
Module.h
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Definition: DiagnosticHandler.h:24
OptBisect.h
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Definition: ELFObjHandler.cpp:81
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Definition: LLVMContextImpl.h:1394
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Definition: StringMap.h:216
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Definition: LLVMContextImpl.cpp:41
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Definition: LLVMContextImpl.cpp:218
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ArrayConstantsTy ArrayConstants
Definition: LLVMContextImpl.h:1415
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@ SSE
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Definition: FoldingSet.h:367
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Definition: LLVMContextImpl.cpp:205
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Definition: README_ALTIVEC.txt:86
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Definition: StringMap.h:274
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Definition: LLVMContextImpl.h:1412
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Definition: OptBisect.h:27
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Definition: LLVMContextImpl.cpp:194
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Definition: Constants.h:409
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Definition: SmallVector.h:606
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Definition: Metadata.h:62
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Definition: LLVMContextImpl.h:1429
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Definition: SetVector.h:72
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Definition: Mips16HardFloat.cpp:104
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Definition: LLVMContextImpl.h:1498
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Collection of metadata used in this context.
Definition: LLVMContextImpl.h:1481
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Definition: LLVMContextImpl.h:1423
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Definition: DenseMap.h:111
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Definition: LLVMContext.h:68
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Definition: LLVMContext.h:47
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Definition: SetVector.h:141
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Definition: LLVMContextImpl.h:1383
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Access the object which can disable optional passes and individual optimizations at compile time.
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Definition: StringRef.h:58
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Definition: LLVMContextImpl.cpp:211
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Definition: LLVMContextImpl.h:1427
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Definition: LLVMContextImpl.cpp:154
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Definition: SmallPtrSet.h:91
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Definition: Hashing.h:482
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Definition: Alignment.h:340
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Definition: Metadata.h:753
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Definition: Use.h:44
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