1 //===-- Metadata.cpp - Implement Metadata classes -------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Metadata classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Metadata.h"
15 #include "LLVMContextImpl.h"
16 #include "SymbolTableListTraitsImpl.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/SmallSet.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/StringMap.h"
22 #include "llvm/IR/ConstantRange.h"
23 #include "llvm/IR/Instruction.h"
24 #include "llvm/IR/LLVMContext.h"
25 #include "llvm/IR/Module.h"
26 #include "llvm/IR/ValueHandle.h"
30 MetadataAsValue::MetadataAsValue(Type *Ty, Metadata *MD)
31 : Value(Ty, MetadataAsValueVal), MD(MD) {
35 MetadataAsValue::~MetadataAsValue() {
36 getType()->getContext().pImpl->MetadataAsValues.erase(MD);
40 /// \brief Canonicalize metadata arguments to intrinsics.
42 /// To support bitcode upgrades (and assembly semantic sugar) for \a
43 /// MetadataAsValue, we need to canonicalize certain metadata.
45 /// - nullptr is replaced by an empty MDNode.
46 /// - An MDNode with a single null operand is replaced by an empty MDNode.
47 /// - An MDNode whose only operand is a \a ConstantAsMetadata gets skipped.
49 /// This maintains readability of bitcode from when metadata was a type of
50 /// value, and these bridges were unnecessary.
51 static Metadata *canonicalizeMetadataForValue(LLVMContext &Context,
55 return MDNode::get(Context, None);
57 // Return early if this isn't a single-operand MDNode.
58 auto *N = dyn_cast<MDNode>(MD);
59 if (!N || N->getNumOperands() != 1)
62 if (!N->getOperand(0))
64 return MDNode::get(Context, None);
66 if (auto *C = dyn_cast<ConstantAsMetadata>(N->getOperand(0)))
67 // Look through the MDNode.
73 MetadataAsValue *MetadataAsValue::get(LLVMContext &Context, Metadata *MD) {
74 MD = canonicalizeMetadataForValue(Context, MD);
75 auto *&Entry = Context.pImpl->MetadataAsValues[MD];
77 Entry = new MetadataAsValue(Type::getMetadataTy(Context), MD);
81 MetadataAsValue *MetadataAsValue::getIfExists(LLVMContext &Context,
83 MD = canonicalizeMetadataForValue(Context, MD);
84 auto &Store = Context.pImpl->MetadataAsValues;
85 auto I = Store.find(MD);
86 return I == Store.end() ? nullptr : I->second;
89 void MetadataAsValue::handleChangedMetadata(Metadata *MD) {
90 LLVMContext &Context = getContext();
91 MD = canonicalizeMetadataForValue(Context, MD);
92 auto &Store = Context.pImpl->MetadataAsValues;
94 // Stop tracking the old metadata.
95 Store.erase(this->MD);
99 // Start tracking MD, or RAUW if necessary.
100 auto *&Entry = Store[MD];
102 replaceAllUsesWith(Entry);
112 void MetadataAsValue::track() {
114 MetadataTracking::track(&MD, *MD, *this);
117 void MetadataAsValue::untrack() {
119 MetadataTracking::untrack(MD);
122 void ReplaceableMetadataImpl::addRef(void *Ref, OwnerTy Owner) {
124 UseMap.insert(std::make_pair(Ref, std::make_pair(Owner, NextIndex)))
127 assert(WasInserted && "Expected to add a reference");
130 assert(NextIndex != 0 && "Unexpected overflow");
133 void ReplaceableMetadataImpl::dropRef(void *Ref) {
134 bool WasErased = UseMap.erase(Ref);
136 assert(WasErased && "Expected to drop a reference");
139 void ReplaceableMetadataImpl::moveRef(void *Ref, void *New,
140 const Metadata &MD) {
141 auto I = UseMap.find(Ref);
142 assert(I != UseMap.end() && "Expected to move a reference");
143 auto OwnerAndIndex = I->second;
145 bool WasInserted = UseMap.insert(std::make_pair(New, OwnerAndIndex)).second;
147 assert(WasInserted && "Expected to add a reference");
149 // Check that the references are direct if there's no owner.
151 assert((OwnerAndIndex.first || *static_cast<Metadata **>(Ref) == &MD) &&
152 "Reference without owner must be direct");
153 assert((OwnerAndIndex.first || *static_cast<Metadata **>(New) == &MD) &&
154 "Reference without owner must be direct");
157 void ReplaceableMetadataImpl::replaceAllUsesWith(Metadata *MD) {
158 assert(!(MD && isa<MDNodeFwdDecl>(MD)) && "Expected non-temp node");
163 // Copy out uses since UseMap will get touched below.
164 typedef std::pair<void *, std::pair<OwnerTy, uint64_t>> UseTy;
165 SmallVector<UseTy, 8> Uses(UseMap.begin(), UseMap.end());
166 std::sort(Uses.begin(), Uses.end(), [](const UseTy &L, const UseTy &R) {
167 return L.second.second < R.second.second;
169 for (const auto &Pair : Uses) {
170 OwnerTy Owner = Pair.second.first;
172 // Update unowned tracking references directly.
173 Metadata *&Ref = *static_cast<Metadata **>(Pair.first);
176 MetadataTracking::track(Ref);
177 UseMap.erase(Pair.first);
181 // Check for MetadataAsValue.
182 if (Owner.is<MetadataAsValue *>()) {
183 Owner.get<MetadataAsValue *>()->handleChangedMetadata(MD);
187 // There's a Metadata owner -- dispatch.
188 Metadata *OwnerMD = Owner.get<Metadata *>();
189 switch (OwnerMD->getMetadataID()) {
190 #define HANDLE_METADATA_LEAF(CLASS) \
191 case Metadata::CLASS##Kind: \
192 cast<CLASS>(OwnerMD)->handleChangedOperand(Pair.first, MD); \
194 #include "llvm/IR/Metadata.def"
196 llvm_unreachable("Invalid metadata subclass");
199 assert(UseMap.empty() && "Expected all uses to be replaced");
202 void ReplaceableMetadataImpl::resolveAllUses(bool ResolveUsers) {
211 // Copy out uses since UseMap could get touched below.
212 typedef std::pair<void *, std::pair<OwnerTy, uint64_t>> UseTy;
213 SmallVector<UseTy, 8> Uses(UseMap.begin(), UseMap.end());
214 std::sort(Uses.begin(), Uses.end(), [](const UseTy &L, const UseTy &R) {
215 return L.second.second < R.second.second;
218 for (const auto &Pair : Uses) {
219 auto Owner = Pair.second.first;
222 if (Owner.is<MetadataAsValue *>())
225 // Resolve GenericMDNodes that point at this.
226 auto *OwnerMD = dyn_cast<GenericMDNode>(Owner.get<Metadata *>());
229 if (OwnerMD->isResolved())
231 OwnerMD->decrementUnresolvedOperands();
232 if (!OwnerMD->hasUnresolvedOperands())
237 static Function *getLocalFunction(Value *V) {
238 assert(V && "Expected value");
239 if (auto *A = dyn_cast<Argument>(V))
240 return A->getParent();
241 if (BasicBlock *BB = cast<Instruction>(V)->getParent())
242 return BB->getParent();
246 ValueAsMetadata *ValueAsMetadata::get(Value *V) {
247 assert(V && "Unexpected null Value");
249 auto &Context = V->getContext();
250 auto *&Entry = Context.pImpl->ValuesAsMetadata[V];
252 assert((isa<Constant>(V) || isa<Argument>(V) || isa<Instruction>(V)) &&
253 "Expected constant or function-local value");
254 assert(!V->NameAndIsUsedByMD.getInt() &&
255 "Expected this to be the only metadata use");
256 V->NameAndIsUsedByMD.setInt(true);
257 if (auto *C = dyn_cast<Constant>(V))
258 Entry = new ConstantAsMetadata(Context, C);
260 Entry = new LocalAsMetadata(Context, V);
266 ValueAsMetadata *ValueAsMetadata::getIfExists(Value *V) {
267 assert(V && "Unexpected null Value");
268 return V->getContext().pImpl->ValuesAsMetadata.lookup(V);
271 void ValueAsMetadata::handleDeletion(Value *V) {
272 assert(V && "Expected valid value");
274 auto &Store = V->getType()->getContext().pImpl->ValuesAsMetadata;
275 auto I = Store.find(V);
276 if (I == Store.end())
279 // Remove old entry from the map.
280 ValueAsMetadata *MD = I->second;
281 assert(MD && "Expected valid metadata");
282 assert(MD->getValue() == V && "Expected valid mapping");
285 // Delete the metadata.
286 MD->replaceAllUsesWith(nullptr);
290 void ValueAsMetadata::handleRAUW(Value *From, Value *To) {
291 assert(From && "Expected valid value");
292 assert(To && "Expected valid value");
293 assert(From != To && "Expected changed value");
294 assert(From->getType() == To->getType() && "Unexpected type change");
296 LLVMContext &Context = From->getType()->getContext();
297 auto &Store = Context.pImpl->ValuesAsMetadata;
298 auto I = Store.find(From);
299 if (I == Store.end()) {
300 assert(!From->NameAndIsUsedByMD.getInt() &&
301 "Expected From not to be used by metadata");
305 // Remove old entry from the map.
306 assert(From->NameAndIsUsedByMD.getInt() &&
307 "Expected From to be used by metadata");
308 From->NameAndIsUsedByMD.setInt(false);
309 ValueAsMetadata *MD = I->second;
310 assert(MD && "Expected valid metadata");
311 assert(MD->getValue() == From && "Expected valid mapping");
314 if (isa<LocalAsMetadata>(MD)) {
315 if (auto *C = dyn_cast<Constant>(To)) {
316 // Local became a constant.
317 MD->replaceAllUsesWith(ConstantAsMetadata::get(C));
321 if (getLocalFunction(From) && getLocalFunction(To) &&
322 getLocalFunction(From) != getLocalFunction(To)) {
324 MD->replaceAllUsesWith(nullptr);
328 } else if (!isa<Constant>(To)) {
329 // Changed to function-local value.
330 MD->replaceAllUsesWith(nullptr);
335 auto *&Entry = Store[To];
337 // The target already exists.
338 MD->replaceAllUsesWith(Entry);
343 // Update MD in place (and update the map entry).
344 assert(!To->NameAndIsUsedByMD.getInt() &&
345 "Expected this to be the only metadata use");
346 To->NameAndIsUsedByMD.setInt(true);
351 //===----------------------------------------------------------------------===//
352 // MDString implementation.
355 MDString *MDString::get(LLVMContext &Context, StringRef Str) {
356 auto &Store = Context.pImpl->MDStringCache;
357 auto I = Store.find(Str);
358 if (I != Store.end())
362 StringMapEntry<MDString>::Create(Str, Store.getAllocator(), MDString());
363 bool WasInserted = Store.insert(Entry);
365 assert(WasInserted && "Expected entry to be inserted");
366 Entry->second.Entry = Entry;
367 return &Entry->second;
370 StringRef MDString::getString() const {
371 assert(Entry && "Expected to find string map entry");
372 return Entry->first();
375 //===----------------------------------------------------------------------===//
376 // MDNode implementation.
379 void *MDNode::operator new(size_t Size, unsigned NumOps) {
380 void *Ptr = ::operator new(Size + NumOps * sizeof(MDOperand));
381 MDOperand *O = static_cast<MDOperand *>(Ptr);
382 for (MDOperand *E = O + NumOps; O != E; ++O)
383 (void)new (O) MDOperand;
387 void MDNode::operator delete(void *Mem) {
388 MDNode *N = static_cast<MDNode *>(Mem);
389 MDOperand *O = static_cast<MDOperand *>(Mem);
390 for (MDOperand *E = O - N->NumOperands; O != E; --O)
391 (O - 1)->~MDOperand();
392 ::operator delete(O);
395 MDNode::MDNode(LLVMContext &Context, unsigned ID, ArrayRef<Metadata *> MDs)
396 : Metadata(ID), Context(Context), NumOperands(MDs.size()),
397 MDNodeSubclassData(0) {
398 for (unsigned I = 0, E = MDs.size(); I != E; ++I)
399 setOperand(I, MDs[I]);
402 bool MDNode::isResolved() const {
403 if (isa<MDNodeFwdDecl>(this))
405 return cast<GenericMDNode>(this)->isResolved();
408 static bool isOperandUnresolved(Metadata *Op) {
409 if (auto *N = dyn_cast_or_null<MDNode>(Op))
410 return !N->isResolved();
414 GenericMDNode::GenericMDNode(LLVMContext &C, ArrayRef<Metadata *> Vals)
415 : MDNode(C, GenericMDNodeKind, Vals) {
416 // Check whether any operands are unresolved, requiring re-uniquing.
417 for (const auto &Op : operands())
418 if (isOperandUnresolved(Op))
419 incrementUnresolvedOperands();
421 if (hasUnresolvedOperands())
422 ReplaceableUses.reset(new ReplaceableMetadataImpl);
425 GenericMDNode::~GenericMDNode() {
426 LLVMContextImpl *pImpl = getContext().pImpl;
427 if (isStoredDistinctInContext())
428 pImpl->NonUniquedMDNodes.erase(this);
430 pImpl->MDNodeSet.erase(this);
434 void GenericMDNode::resolve() {
435 assert(!isResolved() && "Expected this to be unresolved");
437 // Move the map, so that this immediately looks resolved.
438 auto Uses = std::move(ReplaceableUses);
440 assert(isResolved() && "Expected this to be resolved");
442 // Drop RAUW support.
443 Uses->resolveAllUses();
446 void GenericMDNode::resolveCycles() {
450 // Resolve this node immediately.
453 // Resolve all operands.
454 for (const auto &Op : operands()) {
457 assert(!isa<MDNodeFwdDecl>(Op) &&
458 "Expected all forward declarations to be resolved");
459 if (auto *N = dyn_cast<GenericMDNode>(Op))
460 if (!N->isResolved())
465 void MDNode::dropAllReferences() {
466 for (unsigned I = 0, E = NumOperands; I != E; ++I)
467 setOperand(I, nullptr);
468 if (auto *G = dyn_cast<GenericMDNode>(this))
469 if (!G->isResolved()) {
470 G->ReplaceableUses->resolveAllUses(/* ResolveUsers */ false);
471 G->ReplaceableUses.reset();
476 /// \brief Make MDOperand transparent for hashing.
478 /// This overload of an implementation detail of the hashing library makes
479 /// MDOperand hash to the same value as a \a Metadata pointer.
481 /// Note that overloading \a hash_value() as follows:
484 /// size_t hash_value(const MDOperand &X) { return hash_value(X.get()); }
487 /// does not cause MDOperand to be transparent. In particular, a bare pointer
488 /// doesn't get hashed before it's combined, whereas \a MDOperand would.
489 static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
492 void GenericMDNode::handleChangedOperand(void *Ref, Metadata *New) {
493 unsigned Op = static_cast<MDOperand *>(Ref) - op_begin();
494 assert(Op < getNumOperands() && "Expected valid operand");
496 if (isStoredDistinctInContext()) {
497 assert(isResolved() && "Expected distinct node to be resolved");
499 // This node is not uniqued. Just set the operand and be done with it.
504 // We just hit a recursion due to RAUW. Set the operand and move on, since
505 // we're about to be deleted.
507 // FIXME: Can this cycle really happen?
512 auto &Store = getContext().pImpl->MDNodeSet;
515 Metadata *Old = getOperand(Op);
518 // Drop uniquing for self-reference cycles or if an operand drops to null.
520 // FIXME: Stop dropping uniquing when an operand drops to null. The original
521 // motivation was to prevent madness during teardown of LLVMContextImpl, but
522 // dropAllReferences() fixes that problem in a better way. (It's just here
523 // now for better staging of semantic changes.)
524 if (New == this || !New) {
525 storeDistinctInContext();
532 // Re-calculate the hash.
533 setHash(hash_combine_range(op_begin(), op_end()));
536 SmallVector<Metadata *, 8> MDs(op_begin(), op_end());
537 unsigned RawHash = hash_combine_range(MDs.begin(), MDs.end());
538 assert(getHash() == RawHash &&
539 "Expected hash of MDOperand to equal hash of Metadata*");
543 // Re-unique the node.
544 GenericMDNodeInfo::KeyTy Key(this);
545 auto I = Store.find_as(Key);
546 if (I == Store.end()) {
550 // Check if the last unresolved operand has just been resolved; if so,
551 // resolve this as well.
552 if (isOperandUnresolved(Old))
553 decrementUnresolvedOperands();
554 if (isOperandUnresolved(New))
555 incrementUnresolvedOperands();
556 if (!hasUnresolvedOperands())
565 // Still unresolved, so RAUW.
567 ReplaceableUses->replaceAllUsesWith(*I);
572 // Store in non-uniqued form if this node has already been resolved.
574 storeDistinctInContext();
577 MDNode *MDNode::getMDNode(LLVMContext &Context, ArrayRef<Metadata *> MDs,
579 auto &Store = Context.pImpl->MDNodeSet;
581 GenericMDNodeInfo::KeyTy Key(MDs);
582 auto I = Store.find_as(Key);
583 if (I != Store.end())
588 // Coallocate space for the node and Operands together, then placement new.
589 GenericMDNode *N = new (MDs.size()) GenericMDNode(Context, MDs);
590 N->setHash(Key.Hash);
595 MDNodeFwdDecl *MDNode::getTemporary(LLVMContext &Context,
596 ArrayRef<Metadata *> MDs) {
597 MDNodeFwdDecl *N = new (MDs.size()) MDNodeFwdDecl(Context, MDs);
601 void MDNode::deleteTemporary(MDNode *N) {
602 assert(isa<MDNodeFwdDecl>(N) && "Expected forward declaration");
603 delete cast<MDNodeFwdDecl>(N);
606 void MDNode::storeDistinctInContext() {
607 assert(!IsDistinctInContext && "Expected newly distinct metadata");
608 IsDistinctInContext = true;
609 auto *G = cast<GenericMDNode>(this);
611 getContext().pImpl->NonUniquedMDNodes.insert(G);
614 // Replace value from this node's operand list.
615 void MDNode::replaceOperandWith(unsigned I, Metadata *New) {
616 if (getOperand(I) == New)
619 if (auto *N = dyn_cast<GenericMDNode>(this)) {
620 N->handleChangedOperand(mutable_begin() + I, New);
624 assert(isa<MDNodeFwdDecl>(this) && "Expected an MDNode");
628 void MDNode::setOperand(unsigned I, Metadata *New) {
629 assert(I < NumOperands);
630 if (isStoredDistinctInContext() || isa<MDNodeFwdDecl>(this))
631 // No need for a callback, this isn't uniqued.
632 mutable_begin()[I].reset(New, nullptr);
634 mutable_begin()[I].reset(New, this);
637 /// \brief Get a node, or a self-reference that looks like it.
639 /// Special handling for finding self-references, for use by \a
640 /// MDNode::concatenate() and \a MDNode::intersect() to maintain behaviour from
641 /// when self-referencing nodes were still uniqued. If the first operand has
642 /// the same operands as \c Ops, return the first operand instead.
643 static MDNode *getOrSelfReference(LLVMContext &Context,
644 ArrayRef<Metadata *> Ops) {
646 if (MDNode *N = dyn_cast_or_null<MDNode>(Ops[0]))
647 if (N->getNumOperands() == Ops.size() && N == N->getOperand(0)) {
648 for (unsigned I = 1, E = Ops.size(); I != E; ++I)
649 if (Ops[I] != N->getOperand(I))
650 return MDNode::get(Context, Ops);
654 return MDNode::get(Context, Ops);
657 MDNode *MDNode::concatenate(MDNode *A, MDNode *B) {
663 SmallVector<Metadata *, 4> MDs(A->getNumOperands() + B->getNumOperands());
666 for (unsigned i = 0, ie = A->getNumOperands(); i != ie; ++i)
667 MDs[j++] = A->getOperand(i);
668 for (unsigned i = 0, ie = B->getNumOperands(); i != ie; ++i)
669 MDs[j++] = B->getOperand(i);
671 // FIXME: This preserves long-standing behaviour, but is it really the right
672 // behaviour? Or was that an unintended side-effect of node uniquing?
673 return getOrSelfReference(A->getContext(), MDs);
676 MDNode *MDNode::intersect(MDNode *A, MDNode *B) {
680 SmallVector<Metadata *, 4> MDs;
681 for (unsigned i = 0, ie = A->getNumOperands(); i != ie; ++i) {
682 Metadata *MD = A->getOperand(i);
683 for (unsigned j = 0, je = B->getNumOperands(); j != je; ++j)
684 if (MD == B->getOperand(j)) {
690 // FIXME: This preserves long-standing behaviour, but is it really the right
691 // behaviour? Or was that an unintended side-effect of node uniquing?
692 return getOrSelfReference(A->getContext(), MDs);
695 MDNode *MDNode::getMostGenericFPMath(MDNode *A, MDNode *B) {
699 APFloat AVal = mdconst::extract<ConstantFP>(A->getOperand(0))->getValueAPF();
700 APFloat BVal = mdconst::extract<ConstantFP>(B->getOperand(0))->getValueAPF();
701 if (AVal.compare(BVal) == APFloat::cmpLessThan)
706 static bool isContiguous(const ConstantRange &A, const ConstantRange &B) {
707 return A.getUpper() == B.getLower() || A.getLower() == B.getUpper();
710 static bool canBeMerged(const ConstantRange &A, const ConstantRange &B) {
711 return !A.intersectWith(B).isEmptySet() || isContiguous(A, B);
714 static bool tryMergeRange(SmallVectorImpl<ConstantInt *> &EndPoints,
715 ConstantInt *Low, ConstantInt *High) {
716 ConstantRange NewRange(Low->getValue(), High->getValue());
717 unsigned Size = EndPoints.size();
718 APInt LB = EndPoints[Size - 2]->getValue();
719 APInt LE = EndPoints[Size - 1]->getValue();
720 ConstantRange LastRange(LB, LE);
721 if (canBeMerged(NewRange, LastRange)) {
722 ConstantRange Union = LastRange.unionWith(NewRange);
723 Type *Ty = High->getType();
724 EndPoints[Size - 2] =
725 cast<ConstantInt>(ConstantInt::get(Ty, Union.getLower()));
726 EndPoints[Size - 1] =
727 cast<ConstantInt>(ConstantInt::get(Ty, Union.getUpper()));
733 static void addRange(SmallVectorImpl<ConstantInt *> &EndPoints,
734 ConstantInt *Low, ConstantInt *High) {
735 if (!EndPoints.empty())
736 if (tryMergeRange(EndPoints, Low, High))
739 EndPoints.push_back(Low);
740 EndPoints.push_back(High);
743 MDNode *MDNode::getMostGenericRange(MDNode *A, MDNode *B) {
744 // Given two ranges, we want to compute the union of the ranges. This
745 // is slightly complitade by having to combine the intervals and merge
746 // the ones that overlap.
754 // First, walk both lists in older of the lower boundary of each interval.
755 // At each step, try to merge the new interval to the last one we adedd.
756 SmallVector<ConstantInt *, 4> EndPoints;
759 int AN = A->getNumOperands() / 2;
760 int BN = B->getNumOperands() / 2;
761 while (AI < AN && BI < BN) {
762 ConstantInt *ALow = mdconst::extract<ConstantInt>(A->getOperand(2 * AI));
763 ConstantInt *BLow = mdconst::extract<ConstantInt>(B->getOperand(2 * BI));
765 if (ALow->getValue().slt(BLow->getValue())) {
766 addRange(EndPoints, ALow,
767 mdconst::extract<ConstantInt>(A->getOperand(2 * AI + 1)));
770 addRange(EndPoints, BLow,
771 mdconst::extract<ConstantInt>(B->getOperand(2 * BI + 1)));
776 addRange(EndPoints, mdconst::extract<ConstantInt>(A->getOperand(2 * AI)),
777 mdconst::extract<ConstantInt>(A->getOperand(2 * AI + 1)));
781 addRange(EndPoints, mdconst::extract<ConstantInt>(B->getOperand(2 * BI)),
782 mdconst::extract<ConstantInt>(B->getOperand(2 * BI + 1)));
786 // If we have more than 2 ranges (4 endpoints) we have to try to merge
787 // the last and first ones.
788 unsigned Size = EndPoints.size();
790 ConstantInt *FB = EndPoints[0];
791 ConstantInt *FE = EndPoints[1];
792 if (tryMergeRange(EndPoints, FB, FE)) {
793 for (unsigned i = 0; i < Size - 2; ++i) {
794 EndPoints[i] = EndPoints[i + 2];
796 EndPoints.resize(Size - 2);
800 // If in the end we have a single range, it is possible that it is now the
801 // full range. Just drop the metadata in that case.
802 if (EndPoints.size() == 2) {
803 ConstantRange Range(EndPoints[0]->getValue(), EndPoints[1]->getValue());
804 if (Range.isFullSet())
808 SmallVector<Metadata *, 4> MDs;
809 MDs.reserve(EndPoints.size());
810 for (auto *I : EndPoints)
811 MDs.push_back(ConstantAsMetadata::get(I));
812 return MDNode::get(A->getContext(), MDs);
815 //===----------------------------------------------------------------------===//
816 // NamedMDNode implementation.
819 static SmallVector<TrackingMDRef, 4> &getNMDOps(void *Operands) {
820 return *(SmallVector<TrackingMDRef, 4> *)Operands;
823 NamedMDNode::NamedMDNode(const Twine &N)
824 : Name(N.str()), Parent(nullptr),
825 Operands(new SmallVector<TrackingMDRef, 4>()) {}
827 NamedMDNode::~NamedMDNode() {
829 delete &getNMDOps(Operands);
832 unsigned NamedMDNode::getNumOperands() const {
833 return (unsigned)getNMDOps(Operands).size();
836 MDNode *NamedMDNode::getOperand(unsigned i) const {
837 assert(i < getNumOperands() && "Invalid Operand number!");
838 auto *N = getNMDOps(Operands)[i].get();
839 return cast_or_null<MDNode>(N);
842 void NamedMDNode::addOperand(MDNode *M) { getNMDOps(Operands).emplace_back(M); }
844 void NamedMDNode::eraseFromParent() {
845 getParent()->eraseNamedMetadata(this);
848 void NamedMDNode::dropAllReferences() {
849 getNMDOps(Operands).clear();
852 StringRef NamedMDNode::getName() const {
853 return StringRef(Name);
856 //===----------------------------------------------------------------------===//
857 // Instruction Metadata method implementations.
860 void Instruction::setMetadata(StringRef Kind, MDNode *Node) {
861 if (!Node && !hasMetadata())
863 setMetadata(getContext().getMDKindID(Kind), Node);
866 MDNode *Instruction::getMetadataImpl(StringRef Kind) const {
867 return getMetadataImpl(getContext().getMDKindID(Kind));
870 void Instruction::dropUnknownMetadata(ArrayRef<unsigned> KnownIDs) {
871 SmallSet<unsigned, 5> KnownSet;
872 KnownSet.insert(KnownIDs.begin(), KnownIDs.end());
874 // Drop debug if needed
875 if (KnownSet.erase(LLVMContext::MD_dbg))
878 if (!hasMetadataHashEntry())
879 return; // Nothing to remove!
881 DenseMap<const Instruction *, LLVMContextImpl::MDMapTy> &MetadataStore =
882 getContext().pImpl->MetadataStore;
884 if (KnownSet.empty()) {
885 // Just drop our entry at the store.
886 MetadataStore.erase(this);
887 setHasMetadataHashEntry(false);
891 LLVMContextImpl::MDMapTy &Info = MetadataStore[this];
894 // Walk the array and drop any metadata we don't know.
895 for (I = 0, E = Info.size(); I != E;) {
896 if (KnownSet.count(Info[I].first)) {
901 Info[I] = std::move(Info.back());
905 assert(E == Info.size());
908 // Drop our entry at the store.
909 MetadataStore.erase(this);
910 setHasMetadataHashEntry(false);
914 /// setMetadata - Set the metadata of of the specified kind to the specified
915 /// node. This updates/replaces metadata if already present, or removes it if
917 void Instruction::setMetadata(unsigned KindID, MDNode *Node) {
918 if (!Node && !hasMetadata())
921 // Handle 'dbg' as a special case since it is not stored in the hash table.
922 if (KindID == LLVMContext::MD_dbg) {
923 DbgLoc = DebugLoc::getFromDILocation(Node);
927 // Handle the case when we're adding/updating metadata on an instruction.
929 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
930 assert(!Info.empty() == hasMetadataHashEntry() &&
931 "HasMetadata bit is wonked");
933 setHasMetadataHashEntry(true);
935 // Handle replacement of an existing value.
937 if (P.first == KindID) {
938 P.second.reset(Node);
943 // No replacement, just add it to the list.
944 Info.emplace_back(std::piecewise_construct, std::make_tuple(KindID),
945 std::make_tuple(Node));
949 // Otherwise, we're removing metadata from an instruction.
950 assert((hasMetadataHashEntry() ==
951 (getContext().pImpl->MetadataStore.count(this) > 0)) &&
952 "HasMetadata bit out of date!");
953 if (!hasMetadataHashEntry())
954 return; // Nothing to remove!
955 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
957 // Common case is removing the only entry.
958 if (Info.size() == 1 && Info[0].first == KindID) {
959 getContext().pImpl->MetadataStore.erase(this);
960 setHasMetadataHashEntry(false);
964 // Handle removal of an existing value.
965 for (unsigned i = 0, e = Info.size(); i != e; ++i)
966 if (Info[i].first == KindID) {
967 Info[i] = std::move(Info.back());
969 assert(!Info.empty() && "Removing last entry should be handled above");
972 // Otherwise, removing an entry that doesn't exist on the instruction.
975 void Instruction::setAAMetadata(const AAMDNodes &N) {
976 setMetadata(LLVMContext::MD_tbaa, N.TBAA);
977 setMetadata(LLVMContext::MD_alias_scope, N.Scope);
978 setMetadata(LLVMContext::MD_noalias, N.NoAlias);
981 MDNode *Instruction::getMetadataImpl(unsigned KindID) const {
982 // Handle 'dbg' as a special case since it is not stored in the hash table.
983 if (KindID == LLVMContext::MD_dbg)
984 return DbgLoc.getAsMDNode();
986 if (!hasMetadataHashEntry()) return nullptr;
988 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
989 assert(!Info.empty() && "bit out of sync with hash table");
991 for (const auto &I : Info)
992 if (I.first == KindID)
997 void Instruction::getAllMetadataImpl(
998 SmallVectorImpl<std::pair<unsigned, MDNode *>> &Result) const {
1001 // Handle 'dbg' as a special case since it is not stored in the hash table.
1002 if (!DbgLoc.isUnknown()) {
1004 std::make_pair((unsigned)LLVMContext::MD_dbg, DbgLoc.getAsMDNode()));
1005 if (!hasMetadataHashEntry()) return;
1008 assert(hasMetadataHashEntry() &&
1009 getContext().pImpl->MetadataStore.count(this) &&
1010 "Shouldn't have called this");
1011 const LLVMContextImpl::MDMapTy &Info =
1012 getContext().pImpl->MetadataStore.find(this)->second;
1013 assert(!Info.empty() && "Shouldn't have called this");
1015 Result.reserve(Result.size() + Info.size());
1016 for (auto &I : Info)
1017 Result.push_back(std::make_pair(I.first, cast<MDNode>(I.second.get())));
1019 // Sort the resulting array so it is stable.
1020 if (Result.size() > 1)
1021 array_pod_sort(Result.begin(), Result.end());
1024 void Instruction::getAllMetadataOtherThanDebugLocImpl(
1025 SmallVectorImpl<std::pair<unsigned, MDNode *>> &Result) const {
1027 assert(hasMetadataHashEntry() &&
1028 getContext().pImpl->MetadataStore.count(this) &&
1029 "Shouldn't have called this");
1030 const LLVMContextImpl::MDMapTy &Info =
1031 getContext().pImpl->MetadataStore.find(this)->second;
1032 assert(!Info.empty() && "Shouldn't have called this");
1033 Result.reserve(Result.size() + Info.size());
1034 for (auto &I : Info)
1035 Result.push_back(std::make_pair(I.first, cast<MDNode>(I.second.get())));
1037 // Sort the resulting array so it is stable.
1038 if (Result.size() > 1)
1039 array_pod_sort(Result.begin(), Result.end());
1042 /// clearMetadataHashEntries - Clear all hashtable-based metadata from
1043 /// this instruction.
1044 void Instruction::clearMetadataHashEntries() {
1045 assert(hasMetadataHashEntry() && "Caller should check");
1046 getContext().pImpl->MetadataStore.erase(this);
1047 setHasMetadataHashEntry(false);