1 //===- MetadataLoader.cpp - Internal BitcodeReader implementation ---------===//
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 #include "MetadataLoader.h"
11 #include "ValueList.h"
13 #include "llvm/ADT/APFloat.h"
14 #include "llvm/ADT/APInt.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/ADT/DenseMap.h"
17 #include "llvm/ADT/DenseSet.h"
18 #include "llvm/ADT/None.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/ADT/Twine.h"
25 #include "llvm/Bitcode/BitcodeReader.h"
26 #include "llvm/Bitcode/BitstreamReader.h"
27 #include "llvm/Bitcode/LLVMBitCodes.h"
28 #include "llvm/IR/Argument.h"
29 #include "llvm/IR/Attributes.h"
30 #include "llvm/IR/AutoUpgrade.h"
31 #include "llvm/IR/BasicBlock.h"
32 #include "llvm/IR/CallingConv.h"
33 #include "llvm/IR/Comdat.h"
34 #include "llvm/IR/Constant.h"
35 #include "llvm/IR/Constants.h"
36 #include "llvm/IR/DebugInfo.h"
37 #include "llvm/IR/DebugInfoMetadata.h"
38 #include "llvm/IR/DebugLoc.h"
39 #include "llvm/IR/DerivedTypes.h"
40 #include "llvm/IR/DiagnosticPrinter.h"
41 #include "llvm/IR/Function.h"
42 #include "llvm/IR/GVMaterializer.h"
43 #include "llvm/IR/GlobalAlias.h"
44 #include "llvm/IR/GlobalIFunc.h"
45 #include "llvm/IR/GlobalIndirectSymbol.h"
46 #include "llvm/IR/GlobalObject.h"
47 #include "llvm/IR/GlobalValue.h"
48 #include "llvm/IR/GlobalVariable.h"
49 #include "llvm/IR/InlineAsm.h"
50 #include "llvm/IR/InstrTypes.h"
51 #include "llvm/IR/Instruction.h"
52 #include "llvm/IR/Instructions.h"
53 #include "llvm/IR/IntrinsicInst.h"
54 #include "llvm/IR/Intrinsics.h"
55 #include "llvm/IR/LLVMContext.h"
56 #include "llvm/IR/Module.h"
57 #include "llvm/IR/ModuleSummaryIndex.h"
58 #include "llvm/IR/OperandTraits.h"
59 #include "llvm/IR/TrackingMDRef.h"
60 #include "llvm/IR/Type.h"
61 #include "llvm/IR/ValueHandle.h"
62 #include "llvm/Support/AtomicOrdering.h"
63 #include "llvm/Support/Casting.h"
64 #include "llvm/Support/CommandLine.h"
65 #include "llvm/Support/Compiler.h"
66 #include "llvm/Support/Debug.h"
67 #include "llvm/Support/Error.h"
68 #include "llvm/Support/ErrorHandling.h"
69 #include "llvm/Support/ManagedStatic.h"
70 #include "llvm/Support/MemoryBuffer.h"
71 #include "llvm/Support/raw_ostream.h"
81 #include <system_error>
88 #define DEBUG_TYPE "bitcode-reader"
90 STATISTIC(NumMDStringLoaded, "Number of MDStrings loaded");
91 STATISTIC(NumMDNodeTemporary, "Number of MDNode::Temporary created");
92 STATISTIC(NumMDRecordLoaded, "Number of Metadata records loaded");
94 /// Flag whether we need to import full type definitions for ThinLTO.
95 /// Currently needed for Darwin and LLDB.
96 static cl::opt<bool> ImportFullTypeDefinitions(
97 "import-full-type-definitions", cl::init(false), cl::Hidden,
98 cl::desc("Import full type definitions for ThinLTO."));
100 static cl::opt<bool> DisableLazyLoading(
101 "disable-ondemand-mds-loading", cl::init(false), cl::Hidden,
102 cl::desc("Force disable the lazy-loading on-demand of metadata when "
103 "loading bitcode for importing."));
107 static int64_t unrotateSign(uint64_t U) { return U & 1 ? ~(U >> 1) : U >> 1; }
109 class BitcodeReaderMetadataList {
110 /// Array of metadata references.
112 /// Don't use std::vector here. Some versions of libc++ copy (instead of
113 /// move) on resize, and TrackingMDRef is very expensive to copy.
114 SmallVector<TrackingMDRef, 1> MetadataPtrs;
116 /// The set of indices in MetadataPtrs above of forward references that were
118 SmallDenseSet<unsigned, 1> ForwardReference;
120 /// The set of indices in MetadataPtrs above of Metadata that need to be
122 SmallDenseSet<unsigned, 1> UnresolvedNodes;
124 /// Structures for resolving old type refs.
126 SmallDenseMap<MDString *, TempMDTuple, 1> Unknown;
127 SmallDenseMap<MDString *, DICompositeType *, 1> Final;
128 SmallDenseMap<MDString *, DICompositeType *, 1> FwdDecls;
129 SmallVector<std::pair<TrackingMDRef, TempMDTuple>, 1> Arrays;
132 LLVMContext &Context;
135 BitcodeReaderMetadataList(LLVMContext &C) : Context(C) {}
137 // vector compatibility methods
138 unsigned size() const { return MetadataPtrs.size(); }
139 void resize(unsigned N) { MetadataPtrs.resize(N); }
140 void push_back(Metadata *MD) { MetadataPtrs.emplace_back(MD); }
141 void clear() { MetadataPtrs.clear(); }
142 Metadata *back() const { return MetadataPtrs.back(); }
143 void pop_back() { MetadataPtrs.pop_back(); }
144 bool empty() const { return MetadataPtrs.empty(); }
146 Metadata *operator[](unsigned i) const {
147 assert(i < MetadataPtrs.size());
148 return MetadataPtrs[i];
151 Metadata *lookup(unsigned I) const {
152 if (I < MetadataPtrs.size())
153 return MetadataPtrs[I];
157 void shrinkTo(unsigned N) {
158 assert(N <= size() && "Invalid shrinkTo request!");
159 assert(ForwardReference.empty() && "Unexpected forward refs");
160 assert(UnresolvedNodes.empty() && "Unexpected unresolved node");
161 MetadataPtrs.resize(N);
164 /// Return the given metadata, creating a replaceable forward reference if
166 Metadata *getMetadataFwdRef(unsigned Idx);
168 /// Return the given metadata only if it is fully resolved.
170 /// Gives the same result as \a lookup(), unless \a MDNode::isResolved()
171 /// would give \c false.
172 Metadata *getMetadataIfResolved(unsigned Idx);
174 MDNode *getMDNodeFwdRefOrNull(unsigned Idx);
175 void assignValue(Metadata *MD, unsigned Idx);
176 void tryToResolveCycles();
177 bool hasFwdRefs() const { return !ForwardReference.empty(); }
178 int getNextFwdRef() {
179 assert(hasFwdRefs());
180 return *ForwardReference.begin();
183 /// Upgrade a type that had an MDString reference.
184 void addTypeRef(MDString &UUID, DICompositeType &CT);
186 /// Upgrade a type that had an MDString reference.
187 Metadata *upgradeTypeRef(Metadata *MaybeUUID);
189 /// Upgrade a type ref array that may have MDString references.
190 Metadata *upgradeTypeRefArray(Metadata *MaybeTuple);
193 Metadata *resolveTypeRefArray(Metadata *MaybeTuple);
196 void BitcodeReaderMetadataList::assignValue(Metadata *MD, unsigned Idx) {
197 if (auto *MDN = dyn_cast<MDNode>(MD))
198 if (!MDN->isResolved())
199 UnresolvedNodes.insert(Idx);
209 TrackingMDRef &OldMD = MetadataPtrs[Idx];
215 // If there was a forward reference to this value, replace it.
216 TempMDTuple PrevMD(cast<MDTuple>(OldMD.get()));
217 PrevMD->replaceAllUsesWith(MD);
218 ForwardReference.erase(Idx);
221 Metadata *BitcodeReaderMetadataList::getMetadataFwdRef(unsigned Idx) {
225 if (Metadata *MD = MetadataPtrs[Idx])
228 // Track forward refs to be resolved later.
229 ForwardReference.insert(Idx);
231 // Create and return a placeholder, which will later be RAUW'd.
232 ++NumMDNodeTemporary;
233 Metadata *MD = MDNode::getTemporary(Context, None).release();
234 MetadataPtrs[Idx].reset(MD);
238 Metadata *BitcodeReaderMetadataList::getMetadataIfResolved(unsigned Idx) {
239 Metadata *MD = lookup(Idx);
240 if (auto *N = dyn_cast_or_null<MDNode>(MD))
241 if (!N->isResolved())
246 MDNode *BitcodeReaderMetadataList::getMDNodeFwdRefOrNull(unsigned Idx) {
247 return dyn_cast_or_null<MDNode>(getMetadataFwdRef(Idx));
250 void BitcodeReaderMetadataList::tryToResolveCycles() {
251 if (!ForwardReference.empty())
252 // Still forward references... can't resolve cycles.
255 // Give up on finding a full definition for any forward decls that remain.
256 for (const auto &Ref : OldTypeRefs.FwdDecls)
257 OldTypeRefs.Final.insert(Ref);
258 OldTypeRefs.FwdDecls.clear();
260 // Upgrade from old type ref arrays. In strange cases, this could add to
261 // OldTypeRefs.Unknown.
262 for (const auto &Array : OldTypeRefs.Arrays)
263 Array.second->replaceAllUsesWith(resolveTypeRefArray(Array.first.get()));
264 OldTypeRefs.Arrays.clear();
266 // Replace old string-based type refs with the resolved node, if possible.
267 // If we haven't seen the node, leave it to the verifier to complain about
268 // the invalid string reference.
269 for (const auto &Ref : OldTypeRefs.Unknown) {
270 if (DICompositeType *CT = OldTypeRefs.Final.lookup(Ref.first))
271 Ref.second->replaceAllUsesWith(CT);
273 Ref.second->replaceAllUsesWith(Ref.first);
275 OldTypeRefs.Unknown.clear();
277 if (UnresolvedNodes.empty())
281 // Resolve any cycles.
282 for (unsigned I : UnresolvedNodes) {
283 auto &MD = MetadataPtrs[I];
284 auto *N = dyn_cast_or_null<MDNode>(MD);
288 assert(!N->isTemporary() && "Unexpected forward reference");
292 // Make sure we return early again until there's another unresolved ref.
293 UnresolvedNodes.clear();
296 void BitcodeReaderMetadataList::addTypeRef(MDString &UUID,
297 DICompositeType &CT) {
298 assert(CT.getRawIdentifier() == &UUID && "Mismatched UUID");
299 if (CT.isForwardDecl())
300 OldTypeRefs.FwdDecls.insert(std::make_pair(&UUID, &CT));
302 OldTypeRefs.Final.insert(std::make_pair(&UUID, &CT));
305 Metadata *BitcodeReaderMetadataList::upgradeTypeRef(Metadata *MaybeUUID) {
306 auto *UUID = dyn_cast_or_null<MDString>(MaybeUUID);
307 if (LLVM_LIKELY(!UUID))
310 if (auto *CT = OldTypeRefs.Final.lookup(UUID))
313 auto &Ref = OldTypeRefs.Unknown[UUID];
315 Ref = MDNode::getTemporary(Context, None);
319 Metadata *BitcodeReaderMetadataList::upgradeTypeRefArray(Metadata *MaybeTuple) {
320 auto *Tuple = dyn_cast_or_null<MDTuple>(MaybeTuple);
321 if (!Tuple || Tuple->isDistinct())
324 // Look through the array immediately if possible.
325 if (!Tuple->isTemporary())
326 return resolveTypeRefArray(Tuple);
328 // Create and return a placeholder to use for now. Eventually
329 // resolveTypeRefArrays() will be resolve this forward reference.
330 OldTypeRefs.Arrays.emplace_back(
331 std::piecewise_construct, std::forward_as_tuple(Tuple),
332 std::forward_as_tuple(MDTuple::getTemporary(Context, None)));
333 return OldTypeRefs.Arrays.back().second.get();
336 Metadata *BitcodeReaderMetadataList::resolveTypeRefArray(Metadata *MaybeTuple) {
337 auto *Tuple = dyn_cast_or_null<MDTuple>(MaybeTuple);
338 if (!Tuple || Tuple->isDistinct())
341 // Look through the DITypeRefArray, upgrading each DITypeRef.
342 SmallVector<Metadata *, 32> Ops;
343 Ops.reserve(Tuple->getNumOperands());
344 for (Metadata *MD : Tuple->operands())
345 Ops.push_back(upgradeTypeRef(MD));
347 return MDTuple::get(Context, Ops);
352 class PlaceholderQueue {
353 // Placeholders would thrash around when moved, so store in a std::deque
354 // instead of some sort of vector.
355 std::deque<DistinctMDOperandPlaceholder> PHs;
358 ~PlaceholderQueue() {
359 assert(empty() && "PlaceholderQueue hasn't been flushed before being destroyed");
361 bool empty() { return PHs.empty(); }
362 DistinctMDOperandPlaceholder &getPlaceholderOp(unsigned ID);
363 void flush(BitcodeReaderMetadataList &MetadataList);
365 /// Return the list of temporaries nodes in the queue, these need to be
366 /// loaded before we can flush the queue.
367 void getTemporaries(BitcodeReaderMetadataList &MetadataList,
368 DenseSet<unsigned> &Temporaries) {
369 for (auto &PH : PHs) {
370 auto ID = PH.getID();
371 auto *MD = MetadataList.lookup(ID);
373 Temporaries.insert(ID);
376 auto *N = dyn_cast_or_null<MDNode>(MD);
377 if (N && N->isTemporary())
378 Temporaries.insert(ID);
383 } // end anonymous namespace
385 DistinctMDOperandPlaceholder &PlaceholderQueue::getPlaceholderOp(unsigned ID) {
386 PHs.emplace_back(ID);
390 void PlaceholderQueue::flush(BitcodeReaderMetadataList &MetadataList) {
391 while (!PHs.empty()) {
392 auto *MD = MetadataList.lookup(PHs.front().getID());
393 assert(MD && "Flushing placeholder on unassigned MD");
395 if (auto *MDN = dyn_cast<MDNode>(MD))
396 assert(MDN->isResolved() &&
397 "Flushing Placeholder while cycles aren't resolved");
399 PHs.front().replaceUseWith(MD);
404 } // anonynous namespace
406 static Error error(const Twine &Message) {
407 return make_error<StringError>(
408 Message, make_error_code(BitcodeError::CorruptedBitcode));
411 class MetadataLoader::MetadataLoaderImpl {
412 BitcodeReaderMetadataList MetadataList;
413 BitcodeReaderValueList &ValueList;
414 BitstreamCursor &Stream;
415 LLVMContext &Context;
417 std::function<Type *(unsigned)> getTypeByID;
419 /// Cursor associated with the lazy-loading of Metadata. This is the easy way
420 /// to keep around the right "context" (Abbrev list) to be able to jump in
421 /// the middle of the metadata block and load any record.
422 BitstreamCursor IndexCursor;
424 /// Index that keeps track of MDString values.
425 std::vector<StringRef> MDStringRef;
427 /// On-demand loading of a single MDString. Requires the index above to be
429 MDString *lazyLoadOneMDString(unsigned Idx);
431 /// Index that keeps track of where to find a metadata record in the stream.
432 std::vector<uint64_t> GlobalMetadataBitPosIndex;
434 /// Populate the index above to enable lazily loading of metadata, and load
435 /// the named metadata as well as the transitively referenced global
437 Expected<bool> lazyLoadModuleMetadataBlock();
439 /// On-demand loading of a single metadata. Requires the index above to be
441 void lazyLoadOneMetadata(unsigned Idx, PlaceholderQueue &Placeholders);
443 // Keep mapping of seens pair of old-style CU <-> SP, and update pointers to
444 // point from SP to CU after a block is completly parsed.
445 std::vector<std::pair<DICompileUnit *, Metadata *>> CUSubprograms;
447 /// Functions that need to be matched with subprograms when upgrading old
449 SmallDenseMap<Function *, DISubprogram *, 16> FunctionsWithSPs;
451 // Map the bitcode's custom MDKind ID to the Module's MDKind ID.
452 DenseMap<unsigned, unsigned> MDKindMap;
454 bool StripTBAA = false;
455 bool HasSeenOldLoopTags = false;
456 bool NeedUpgradeToDIGlobalVariableExpression = false;
457 bool NeedDeclareExpressionUpgrade = false;
459 /// True if metadata is being parsed for a module being ThinLTO imported.
460 bool IsImporting = false;
462 Error parseOneMetadata(SmallVectorImpl<uint64_t> &Record, unsigned Code,
463 PlaceholderQueue &Placeholders, StringRef Blob,
464 unsigned &NextMetadataNo);
465 Error parseMetadataStrings(ArrayRef<uint64_t> Record, StringRef Blob,
466 function_ref<void(StringRef)> CallBack);
467 Error parseGlobalObjectAttachment(GlobalObject &GO,
468 ArrayRef<uint64_t> Record);
469 Error parseMetadataKindRecord(SmallVectorImpl<uint64_t> &Record);
471 void resolveForwardRefsAndPlaceholders(PlaceholderQueue &Placeholders);
473 /// Upgrade old-style CU <-> SP pointers to point from SP to CU.
474 void upgradeCUSubprograms() {
475 for (auto CU_SP : CUSubprograms)
476 if (auto *SPs = dyn_cast_or_null<MDTuple>(CU_SP.second))
477 for (auto &Op : SPs->operands())
478 if (auto *SP = dyn_cast_or_null<DISubprogram>(Op))
479 SP->replaceUnit(CU_SP.first);
480 CUSubprograms.clear();
483 /// Upgrade old-style bare DIGlobalVariables to DIGlobalVariableExpressions.
484 void upgradeCUVariables() {
485 if (!NeedUpgradeToDIGlobalVariableExpression)
488 // Upgrade list of variables attached to the CUs.
489 if (NamedMDNode *CUNodes = TheModule.getNamedMetadata("llvm.dbg.cu"))
490 for (unsigned I = 0, E = CUNodes->getNumOperands(); I != E; ++I) {
491 auto *CU = cast<DICompileUnit>(CUNodes->getOperand(I));
492 if (auto *GVs = dyn_cast_or_null<MDTuple>(CU->getRawGlobalVariables()))
493 for (unsigned I = 0; I < GVs->getNumOperands(); I++)
495 dyn_cast_or_null<DIGlobalVariable>(GVs->getOperand(I))) {
496 auto *DGVE = DIGlobalVariableExpression::getDistinct(
497 Context, GV, DIExpression::get(Context, {}));
498 GVs->replaceOperandWith(I, DGVE);
502 // Upgrade variables attached to globals.
503 for (auto &GV : TheModule.globals()) {
504 SmallVector<MDNode *, 1> MDs;
505 GV.getMetadata(LLVMContext::MD_dbg, MDs);
506 GV.eraseMetadata(LLVMContext::MD_dbg);
508 if (auto *DGV = dyn_cast_or_null<DIGlobalVariable>(MD)) {
509 auto *DGVE = DIGlobalVariableExpression::getDistinct(
510 Context, DGV, DIExpression::get(Context, {}));
511 GV.addMetadata(LLVMContext::MD_dbg, *DGVE);
513 GV.addMetadata(LLVMContext::MD_dbg, *MD);
517 /// Remove a leading DW_OP_deref from DIExpressions in a dbg.declare that
518 /// describes a function argument.
519 void upgradeDeclareExpressions(Function &F) {
520 if (!NeedDeclareExpressionUpgrade)
525 if (auto *DDI = dyn_cast<DbgDeclareInst>(&I))
526 if (auto *DIExpr = DDI->getExpression())
527 if (DIExpr->startsWithDeref() &&
528 dyn_cast_or_null<Argument>(DDI->getAddress())) {
529 SmallVector<uint64_t, 8> Ops;
530 Ops.append(std::next(DIExpr->elements_begin()),
531 DIExpr->elements_end());
532 auto *E = DIExpression::get(Context, Ops);
533 DDI->setOperand(2, MetadataAsValue::get(Context, E));
537 /// Upgrade the expression from previous versions.
538 Error upgradeDIExpression(uint64_t FromVersion,
539 MutableArrayRef<uint64_t> &Expr,
540 SmallVectorImpl<uint64_t> &Buffer) {
541 auto N = Expr.size();
542 switch (FromVersion) {
544 return error("Invalid record");
546 if (N >= 3 && Expr[N - 3] == dwarf::DW_OP_bit_piece)
547 Expr[N - 3] = dwarf::DW_OP_LLVM_fragment;
550 // Move DW_OP_deref to the end.
551 if (N && Expr[0] == dwarf::DW_OP_deref) {
552 auto End = Expr.end();
553 if (Expr.size() >= 3 &&
554 *std::prev(End, 3) == dwarf::DW_OP_LLVM_fragment)
555 End = std::prev(End, 3);
556 std::move(std::next(Expr.begin()), End, Expr.begin());
557 *std::prev(End) = dwarf::DW_OP_deref;
559 NeedDeclareExpressionUpgrade = true;
562 // Change DW_OP_plus to DW_OP_plus_uconst.
563 // Change DW_OP_minus to DW_OP_uconst, DW_OP_minus
564 auto SubExpr = ArrayRef<uint64_t>(Expr);
565 while (!SubExpr.empty()) {
566 // Skip past other operators with their operands
567 // for this version of the IR, obtained from
568 // from historic DIExpression::ExprOperand::getSize().
570 switch (SubExpr.front()) {
574 case dwarf::DW_OP_constu:
575 case dwarf::DW_OP_minus:
576 case dwarf::DW_OP_plus:
579 case dwarf::DW_OP_LLVM_fragment:
584 // If the expression is malformed, make sure we don't
585 // copy more elements than we should.
586 HistoricSize = std::min(SubExpr.size(), HistoricSize);
587 ArrayRef<uint64_t> Args = SubExpr.slice(1, HistoricSize-1);
589 switch (SubExpr.front()) {
590 case dwarf::DW_OP_plus:
591 Buffer.push_back(dwarf::DW_OP_plus_uconst);
592 Buffer.append(Args.begin(), Args.end());
594 case dwarf::DW_OP_minus:
595 Buffer.push_back(dwarf::DW_OP_constu);
596 Buffer.append(Args.begin(), Args.end());
597 Buffer.push_back(dwarf::DW_OP_minus);
600 Buffer.push_back(*SubExpr.begin());
601 Buffer.append(Args.begin(), Args.end());
605 // Continue with remaining elements.
606 SubExpr = SubExpr.slice(HistoricSize);
608 Expr = MutableArrayRef<uint64_t>(Buffer);
616 return Error::success();
619 void upgradeDebugInfo() {
620 upgradeCUSubprograms();
621 upgradeCUVariables();
625 MetadataLoaderImpl(BitstreamCursor &Stream, Module &TheModule,
626 BitcodeReaderValueList &ValueList,
627 std::function<Type *(unsigned)> getTypeByID,
629 : MetadataList(TheModule.getContext()), ValueList(ValueList),
630 Stream(Stream), Context(TheModule.getContext()), TheModule(TheModule),
631 getTypeByID(std::move(getTypeByID)), IsImporting(IsImporting) {}
633 Error parseMetadata(bool ModuleLevel);
635 bool hasFwdRefs() const { return MetadataList.hasFwdRefs(); }
637 Metadata *getMetadataFwdRefOrLoad(unsigned ID) {
638 if (ID < MDStringRef.size())
639 return lazyLoadOneMDString(ID);
640 if (auto *MD = MetadataList.lookup(ID))
642 // If lazy-loading is enabled, we try recursively to load the operand
643 // instead of creating a temporary.
644 if (ID < (MDStringRef.size() + GlobalMetadataBitPosIndex.size())) {
645 PlaceholderQueue Placeholders;
646 lazyLoadOneMetadata(ID, Placeholders);
647 resolveForwardRefsAndPlaceholders(Placeholders);
648 return MetadataList.lookup(ID);
650 return MetadataList.getMetadataFwdRef(ID);
653 DISubprogram *lookupSubprogramForFunction(Function *F) {
654 return FunctionsWithSPs.lookup(F);
657 bool hasSeenOldLoopTags() { return HasSeenOldLoopTags; }
659 Error parseMetadataAttachment(
660 Function &F, const SmallVectorImpl<Instruction *> &InstructionList);
662 Error parseMetadataKinds();
664 void setStripTBAA(bool Value) { StripTBAA = Value; }
665 bool isStrippingTBAA() { return StripTBAA; }
667 unsigned size() const { return MetadataList.size(); }
668 void shrinkTo(unsigned N) { MetadataList.shrinkTo(N); }
669 void upgradeDebugIntrinsics(Function &F) { upgradeDeclareExpressions(F); }
673 MetadataLoader::MetadataLoaderImpl::lazyLoadModuleMetadataBlock() {
674 IndexCursor = Stream;
675 SmallVector<uint64_t, 64> Record;
676 // Get the abbrevs, and preload record positions to make them lazy-loadable.
678 BitstreamEntry Entry = IndexCursor.advanceSkippingSubblocks(
679 BitstreamCursor::AF_DontPopBlockAtEnd);
680 switch (Entry.Kind) {
681 case BitstreamEntry::SubBlock: // Handled for us already.
682 case BitstreamEntry::Error:
683 return error("Malformed block");
684 case BitstreamEntry::EndBlock: {
687 case BitstreamEntry::Record: {
688 // The interesting case.
690 uint64_t CurrentPos = IndexCursor.GetCurrentBitNo();
691 auto Code = IndexCursor.skipRecord(Entry.ID);
693 case bitc::METADATA_STRINGS: {
694 // Rewind and parse the strings.
695 IndexCursor.JumpToBit(CurrentPos);
698 IndexCursor.readRecord(Entry.ID, Record, &Blob);
699 unsigned NumStrings = Record[0];
700 MDStringRef.reserve(NumStrings);
701 auto IndexNextMDString = [&](StringRef Str) {
702 MDStringRef.push_back(Str);
704 if (auto Err = parseMetadataStrings(Record, Blob, IndexNextMDString))
705 return std::move(Err);
708 case bitc::METADATA_INDEX_OFFSET: {
709 // This is the offset to the index, when we see this we skip all the
710 // records and load only an index to these.
711 IndexCursor.JumpToBit(CurrentPos);
713 IndexCursor.readRecord(Entry.ID, Record);
714 if (Record.size() != 2)
715 return error("Invalid record");
716 auto Offset = Record[0] + (Record[1] << 32);
717 auto BeginPos = IndexCursor.GetCurrentBitNo();
718 IndexCursor.JumpToBit(BeginPos + Offset);
719 Entry = IndexCursor.advanceSkippingSubblocks(
720 BitstreamCursor::AF_DontPopBlockAtEnd);
721 assert(Entry.Kind == BitstreamEntry::Record &&
722 "Corrupted bitcode: Expected `Record` when trying to find the "
725 auto Code = IndexCursor.readRecord(Entry.ID, Record);
727 assert(Code == bitc::METADATA_INDEX && "Corrupted bitcode: Expected "
728 "`METADATA_INDEX` when trying "
729 "to find the Metadata index");
732 auto CurrentValue = BeginPos;
733 GlobalMetadataBitPosIndex.reserve(Record.size());
734 for (auto &Elt : Record) {
736 GlobalMetadataBitPosIndex.push_back(CurrentValue);
740 case bitc::METADATA_INDEX:
741 // We don't expect to get there, the Index is loaded when we encounter
743 return error("Corrupted Metadata block");
744 case bitc::METADATA_NAME: {
745 // Named metadata need to be materialized now and aren't deferred.
746 IndexCursor.JumpToBit(CurrentPos);
748 unsigned Code = IndexCursor.readRecord(Entry.ID, Record);
749 assert(Code == bitc::METADATA_NAME);
751 // Read name of the named metadata.
752 SmallString<8> Name(Record.begin(), Record.end());
753 Code = IndexCursor.ReadCode();
755 // Named Metadata comes in two parts, we expect the name to be followed
758 unsigned NextBitCode = IndexCursor.readRecord(Code, Record);
759 assert(NextBitCode == bitc::METADATA_NAMED_NODE);
762 // Read named metadata elements.
763 unsigned Size = Record.size();
764 NamedMDNode *NMD = TheModule.getOrInsertNamedMetadata(Name);
765 for (unsigned i = 0; i != Size; ++i) {
766 // FIXME: We could use a placeholder here, however NamedMDNode are
767 // taking MDNode as operand and not using the Metadata infrastructure.
768 // It is acknowledged by 'TODO: Inherit from Metadata' in the
769 // NamedMDNode class definition.
770 MDNode *MD = MetadataList.getMDNodeFwdRefOrNull(Record[i]);
771 assert(MD && "Invalid metadata: expect fwd ref to MDNode");
776 case bitc::METADATA_GLOBAL_DECL_ATTACHMENT: {
777 // FIXME: we need to do this early because we don't materialize global
779 IndexCursor.JumpToBit(CurrentPos);
781 IndexCursor.readRecord(Entry.ID, Record);
782 if (Record.size() % 2 == 0)
783 return error("Invalid record");
784 unsigned ValueID = Record[0];
785 if (ValueID >= ValueList.size())
786 return error("Invalid record");
787 if (auto *GO = dyn_cast<GlobalObject>(ValueList[ValueID]))
788 if (Error Err = parseGlobalObjectAttachment(
789 *GO, ArrayRef<uint64_t>(Record).slice(1)))
790 return std::move(Err);
793 case bitc::METADATA_KIND:
794 case bitc::METADATA_STRING_OLD:
795 case bitc::METADATA_OLD_FN_NODE:
796 case bitc::METADATA_OLD_NODE:
797 case bitc::METADATA_VALUE:
798 case bitc::METADATA_DISTINCT_NODE:
799 case bitc::METADATA_NODE:
800 case bitc::METADATA_LOCATION:
801 case bitc::METADATA_GENERIC_DEBUG:
802 case bitc::METADATA_SUBRANGE:
803 case bitc::METADATA_ENUMERATOR:
804 case bitc::METADATA_BASIC_TYPE:
805 case bitc::METADATA_DERIVED_TYPE:
806 case bitc::METADATA_COMPOSITE_TYPE:
807 case bitc::METADATA_SUBROUTINE_TYPE:
808 case bitc::METADATA_MODULE:
809 case bitc::METADATA_FILE:
810 case bitc::METADATA_COMPILE_UNIT:
811 case bitc::METADATA_SUBPROGRAM:
812 case bitc::METADATA_LEXICAL_BLOCK:
813 case bitc::METADATA_LEXICAL_BLOCK_FILE:
814 case bitc::METADATA_NAMESPACE:
815 case bitc::METADATA_MACRO:
816 case bitc::METADATA_MACRO_FILE:
817 case bitc::METADATA_TEMPLATE_TYPE:
818 case bitc::METADATA_TEMPLATE_VALUE:
819 case bitc::METADATA_GLOBAL_VAR:
820 case bitc::METADATA_LOCAL_VAR:
821 case bitc::METADATA_LABEL:
822 case bitc::METADATA_EXPRESSION:
823 case bitc::METADATA_OBJC_PROPERTY:
824 case bitc::METADATA_IMPORTED_ENTITY:
825 case bitc::METADATA_GLOBAL_VAR_EXPR:
826 // We don't expect to see any of these, if we see one, give up on
827 // lazy-loading and fallback.
829 GlobalMetadataBitPosIndex.clear();
838 /// Parse a METADATA_BLOCK. If ModuleLevel is true then we are parsing
839 /// module level metadata.
840 Error MetadataLoader::MetadataLoaderImpl::parseMetadata(bool ModuleLevel) {
841 if (!ModuleLevel && MetadataList.hasFwdRefs())
842 return error("Invalid metadata: fwd refs into function blocks");
844 // Record the entry position so that we can jump back here and efficiently
845 // skip the whole block in case we lazy-load.
846 auto EntryPos = Stream.GetCurrentBitNo();
848 if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID))
849 return error("Invalid record");
851 SmallVector<uint64_t, 64> Record;
852 PlaceholderQueue Placeholders;
854 // We lazy-load module-level metadata: we build an index for each record, and
855 // then load individual record as needed, starting with the named metadata.
856 if (ModuleLevel && IsImporting && MetadataList.empty() &&
857 !DisableLazyLoading) {
858 auto SuccessOrErr = lazyLoadModuleMetadataBlock();
860 return SuccessOrErr.takeError();
861 if (SuccessOrErr.get()) {
862 // An index was successfully created and we will be able to load metadata
864 MetadataList.resize(MDStringRef.size() +
865 GlobalMetadataBitPosIndex.size());
867 // Reading the named metadata created forward references and/or
868 // placeholders, that we flush here.
869 resolveForwardRefsAndPlaceholders(Placeholders);
871 // Return at the beginning of the block, since it is easy to skip it
872 // entirely from there.
873 Stream.ReadBlockEnd(); // Pop the abbrev block context.
874 Stream.JumpToBit(EntryPos);
875 if (Stream.SkipBlock())
876 return error("Invalid record");
877 return Error::success();
879 // Couldn't load an index, fallback to loading all the block "old-style".
882 unsigned NextMetadataNo = MetadataList.size();
884 // Read all the records.
886 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
888 switch (Entry.Kind) {
889 case BitstreamEntry::SubBlock: // Handled for us already.
890 case BitstreamEntry::Error:
891 return error("Malformed block");
892 case BitstreamEntry::EndBlock:
893 resolveForwardRefsAndPlaceholders(Placeholders);
895 return Error::success();
896 case BitstreamEntry::Record:
897 // The interesting case.
905 unsigned Code = Stream.readRecord(Entry.ID, Record, &Blob);
907 parseOneMetadata(Record, Code, Placeholders, Blob, NextMetadataNo))
912 MDString *MetadataLoader::MetadataLoaderImpl::lazyLoadOneMDString(unsigned ID) {
914 if (Metadata *MD = MetadataList.lookup(ID))
915 return cast<MDString>(MD);
916 auto MDS = MDString::get(Context, MDStringRef[ID]);
917 MetadataList.assignValue(MDS, ID);
921 void MetadataLoader::MetadataLoaderImpl::lazyLoadOneMetadata(
922 unsigned ID, PlaceholderQueue &Placeholders) {
923 assert(ID < (MDStringRef.size()) + GlobalMetadataBitPosIndex.size());
924 assert(ID >= MDStringRef.size() && "Unexpected lazy-loading of MDString");
925 // Lookup first if the metadata hasn't already been loaded.
926 if (auto *MD = MetadataList.lookup(ID)) {
927 auto *N = dyn_cast_or_null<MDNode>(MD);
928 if (!N->isTemporary())
931 SmallVector<uint64_t, 64> Record;
933 IndexCursor.JumpToBit(GlobalMetadataBitPosIndex[ID - MDStringRef.size()]);
934 auto Entry = IndexCursor.advanceSkippingSubblocks();
936 unsigned Code = IndexCursor.readRecord(Entry.ID, Record, &Blob);
937 if (Error Err = parseOneMetadata(Record, Code, Placeholders, Blob, ID))
938 report_fatal_error("Can't lazyload MD");
941 /// Ensure that all forward-references and placeholders are resolved.
942 /// Iteratively lazy-loading metadata on-demand if needed.
943 void MetadataLoader::MetadataLoaderImpl::resolveForwardRefsAndPlaceholders(
944 PlaceholderQueue &Placeholders) {
945 DenseSet<unsigned> Temporaries;
947 // Populate Temporaries with the placeholders that haven't been loaded yet.
948 Placeholders.getTemporaries(MetadataList, Temporaries);
950 // If we don't have any temporary, or FwdReference, we're done!
951 if (Temporaries.empty() && !MetadataList.hasFwdRefs())
954 // First, load all the temporaries. This can add new placeholders or
955 // forward references.
956 for (auto ID : Temporaries)
957 lazyLoadOneMetadata(ID, Placeholders);
960 // Second, load the forward-references. This can also add new placeholders
961 // or forward references.
962 while (MetadataList.hasFwdRefs())
963 lazyLoadOneMetadata(MetadataList.getNextFwdRef(), Placeholders);
965 // At this point we don't have any forward reference remaining, or temporary
966 // that haven't been loaded. We can safely drop RAUW support and mark cycles
968 MetadataList.tryToResolveCycles();
970 // Finally, everything is in place, we can replace the placeholders operands
971 // with the final node they refer to.
972 Placeholders.flush(MetadataList);
975 Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
976 SmallVectorImpl<uint64_t> &Record, unsigned Code,
977 PlaceholderQueue &Placeholders, StringRef Blob, unsigned &NextMetadataNo) {
979 bool IsDistinct = false;
980 auto getMD = [&](unsigned ID) -> Metadata * {
981 if (ID < MDStringRef.size())
982 return lazyLoadOneMDString(ID);
984 if (auto *MD = MetadataList.lookup(ID))
986 // If lazy-loading is enabled, we try recursively to load the operand
987 // instead of creating a temporary.
988 if (ID < (MDStringRef.size() + GlobalMetadataBitPosIndex.size())) {
989 // Create a temporary for the node that is referencing the operand we
990 // will lazy-load. It is needed before recursing in case there are
992 MetadataList.getMetadataFwdRef(NextMetadataNo);
993 lazyLoadOneMetadata(ID, Placeholders);
994 return MetadataList.lookup(ID);
996 // Return a temporary.
997 return MetadataList.getMetadataFwdRef(ID);
999 if (auto *MD = MetadataList.getMetadataIfResolved(ID))
1001 return &Placeholders.getPlaceholderOp(ID);
1003 auto getMDOrNull = [&](unsigned ID) -> Metadata * {
1005 return getMD(ID - 1);
1008 auto getMDOrNullWithoutPlaceholders = [&](unsigned ID) -> Metadata * {
1010 return MetadataList.getMetadataFwdRef(ID - 1);
1013 auto getMDString = [&](unsigned ID) -> MDString * {
1014 // This requires that the ID is not really a forward reference. In
1015 // particular, the MDString must already have been resolved.
1016 auto MDS = getMDOrNull(ID);
1017 return cast_or_null<MDString>(MDS);
1020 // Support for old type refs.
1021 auto getDITypeRefOrNull = [&](unsigned ID) {
1022 return MetadataList.upgradeTypeRef(getMDOrNull(ID));
1025 #define GET_OR_DISTINCT(CLASS, ARGS) \
1026 (IsDistinct ? CLASS::getDistinct ARGS : CLASS::get ARGS)
1029 default: // Default behavior: ignore.
1031 case bitc::METADATA_NAME: {
1032 // Read name of the named metadata.
1033 SmallString<8> Name(Record.begin(), Record.end());
1035 Code = Stream.ReadCode();
1037 ++NumMDRecordLoaded;
1038 unsigned NextBitCode = Stream.readRecord(Code, Record);
1039 if (NextBitCode != bitc::METADATA_NAMED_NODE)
1040 return error("METADATA_NAME not followed by METADATA_NAMED_NODE");
1042 // Read named metadata elements.
1043 unsigned Size = Record.size();
1044 NamedMDNode *NMD = TheModule.getOrInsertNamedMetadata(Name);
1045 for (unsigned i = 0; i != Size; ++i) {
1046 MDNode *MD = MetadataList.getMDNodeFwdRefOrNull(Record[i]);
1048 return error("Invalid named metadata: expect fwd ref to MDNode");
1049 NMD->addOperand(MD);
1053 case bitc::METADATA_OLD_FN_NODE: {
1054 // FIXME: Remove in 4.0.
1055 // This is a LocalAsMetadata record, the only type of function-local
1057 if (Record.size() % 2 == 1)
1058 return error("Invalid record");
1060 // If this isn't a LocalAsMetadata record, we're dropping it. This used
1061 // to be legal, but there's no upgrade path.
1062 auto dropRecord = [&] {
1063 MetadataList.assignValue(MDNode::get(Context, None), NextMetadataNo);
1066 if (Record.size() != 2) {
1071 Type *Ty = getTypeByID(Record[0]);
1072 if (Ty->isMetadataTy() || Ty->isVoidTy()) {
1077 MetadataList.assignValue(
1078 LocalAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
1083 case bitc::METADATA_OLD_NODE: {
1084 // FIXME: Remove in 4.0.
1085 if (Record.size() % 2 == 1)
1086 return error("Invalid record");
1088 unsigned Size = Record.size();
1089 SmallVector<Metadata *, 8> Elts;
1090 for (unsigned i = 0; i != Size; i += 2) {
1091 Type *Ty = getTypeByID(Record[i]);
1093 return error("Invalid record");
1094 if (Ty->isMetadataTy())
1095 Elts.push_back(getMD(Record[i + 1]));
1096 else if (!Ty->isVoidTy()) {
1098 ValueAsMetadata::get(ValueList.getValueFwdRef(Record[i + 1], Ty));
1099 assert(isa<ConstantAsMetadata>(MD) &&
1100 "Expected non-function-local metadata");
1103 Elts.push_back(nullptr);
1105 MetadataList.assignValue(MDNode::get(Context, Elts), NextMetadataNo);
1109 case bitc::METADATA_VALUE: {
1110 if (Record.size() != 2)
1111 return error("Invalid record");
1113 Type *Ty = getTypeByID(Record[0]);
1114 if (Ty->isMetadataTy() || Ty->isVoidTy())
1115 return error("Invalid record");
1117 MetadataList.assignValue(
1118 ValueAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
1123 case bitc::METADATA_DISTINCT_NODE:
1126 case bitc::METADATA_NODE: {
1127 SmallVector<Metadata *, 8> Elts;
1128 Elts.reserve(Record.size());
1129 for (unsigned ID : Record)
1130 Elts.push_back(getMDOrNull(ID));
1131 MetadataList.assignValue(IsDistinct ? MDNode::getDistinct(Context, Elts)
1132 : MDNode::get(Context, Elts),
1137 case bitc::METADATA_LOCATION: {
1138 if (Record.size() != 5 && Record.size() != 6)
1139 return error("Invalid record");
1141 IsDistinct = Record[0];
1142 unsigned Line = Record[1];
1143 unsigned Column = Record[2];
1144 Metadata *Scope = getMD(Record[3]);
1145 Metadata *InlinedAt = getMDOrNull(Record[4]);
1146 bool ImplicitCode = Record.size() == 6 && Record[5];
1147 MetadataList.assignValue(
1148 GET_OR_DISTINCT(DILocation, (Context, Line, Column, Scope, InlinedAt,
1154 case bitc::METADATA_GENERIC_DEBUG: {
1155 if (Record.size() < 4)
1156 return error("Invalid record");
1158 IsDistinct = Record[0];
1159 unsigned Tag = Record[1];
1160 unsigned Version = Record[2];
1162 if (Tag >= 1u << 16 || Version != 0)
1163 return error("Invalid record");
1165 auto *Header = getMDString(Record[3]);
1166 SmallVector<Metadata *, 8> DwarfOps;
1167 for (unsigned I = 4, E = Record.size(); I != E; ++I)
1168 DwarfOps.push_back(getMDOrNull(Record[I]));
1169 MetadataList.assignValue(
1170 GET_OR_DISTINCT(GenericDINode, (Context, Tag, Header, DwarfOps)),
1175 case bitc::METADATA_SUBRANGE: {
1176 Metadata *Val = nullptr;
1177 // Operand 'count' is interpreted as:
1178 // - Signed integer (version 0)
1179 // - Metadata node (version 1)
1180 switch (Record[0] >> 1) {
1182 Val = GET_OR_DISTINCT(DISubrange,
1183 (Context, Record[1], unrotateSign(Record.back())));
1186 Val = GET_OR_DISTINCT(DISubrange, (Context, getMDOrNull(Record[1]),
1187 unrotateSign(Record.back())));
1190 return error("Invalid record: Unsupported version of DISubrange");
1193 MetadataList.assignValue(Val, NextMetadataNo);
1194 IsDistinct = Record[0] & 1;
1198 case bitc::METADATA_ENUMERATOR: {
1199 if (Record.size() != 3)
1200 return error("Invalid record");
1202 IsDistinct = Record[0] & 1;
1203 bool IsUnsigned = Record[0] & 2;
1204 MetadataList.assignValue(
1205 GET_OR_DISTINCT(DIEnumerator, (Context, unrotateSign(Record[1]),
1206 IsUnsigned, getMDString(Record[2]))),
1211 case bitc::METADATA_BASIC_TYPE: {
1212 if (Record.size() < 6 || Record.size() > 7)
1213 return error("Invalid record");
1215 IsDistinct = Record[0];
1216 DINode::DIFlags Flags = (Record.size() > 6) ?
1217 static_cast<DINode::DIFlags>(Record[6]) : DINode::FlagZero;
1219 MetadataList.assignValue(
1220 GET_OR_DISTINCT(DIBasicType,
1221 (Context, Record[1], getMDString(Record[2]), Record[3],
1222 Record[4], Record[5], Flags)),
1227 case bitc::METADATA_DERIVED_TYPE: {
1228 if (Record.size() < 12 || Record.size() > 13)
1229 return error("Invalid record");
1231 // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means
1232 // that there is no DWARF address space associated with DIDerivedType.
1233 Optional<unsigned> DWARFAddressSpace;
1234 if (Record.size() > 12 && Record[12])
1235 DWARFAddressSpace = Record[12] - 1;
1237 IsDistinct = Record[0];
1238 DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[10]);
1239 MetadataList.assignValue(
1240 GET_OR_DISTINCT(DIDerivedType,
1241 (Context, Record[1], getMDString(Record[2]),
1242 getMDOrNull(Record[3]), Record[4],
1243 getDITypeRefOrNull(Record[5]),
1244 getDITypeRefOrNull(Record[6]), Record[7], Record[8],
1245 Record[9], DWARFAddressSpace, Flags,
1246 getDITypeRefOrNull(Record[11]))),
1251 case bitc::METADATA_COMPOSITE_TYPE: {
1252 if (Record.size() < 16 || Record.size() > 17)
1253 return error("Invalid record");
1255 // If we have a UUID and this is not a forward declaration, lookup the
1257 IsDistinct = Record[0] & 0x1;
1258 bool IsNotUsedInTypeRef = Record[0] >= 2;
1259 unsigned Tag = Record[1];
1260 MDString *Name = getMDString(Record[2]);
1261 Metadata *File = getMDOrNull(Record[3]);
1262 unsigned Line = Record[4];
1263 Metadata *Scope = getDITypeRefOrNull(Record[5]);
1264 Metadata *BaseType = nullptr;
1265 uint64_t SizeInBits = Record[7];
1266 if (Record[8] > (uint64_t)std::numeric_limits<uint32_t>::max())
1267 return error("Alignment value is too large");
1268 uint32_t AlignInBits = Record[8];
1269 uint64_t OffsetInBits = 0;
1270 DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[10]);
1271 Metadata *Elements = nullptr;
1272 unsigned RuntimeLang = Record[12];
1273 Metadata *VTableHolder = nullptr;
1274 Metadata *TemplateParams = nullptr;
1275 Metadata *Discriminator = nullptr;
1276 auto *Identifier = getMDString(Record[15]);
1277 // If this module is being parsed so that it can be ThinLTO imported
1278 // into another module, composite types only need to be imported
1279 // as type declarations (unless full type definitions requested).
1280 // Create type declarations up front to save memory. Also, buildODRType
1281 // handles the case where this is type ODRed with a definition needed
1282 // by the importing module, in which case the existing definition is
1284 if (IsImporting && !ImportFullTypeDefinitions && Identifier &&
1285 (Tag == dwarf::DW_TAG_enumeration_type ||
1286 Tag == dwarf::DW_TAG_class_type ||
1287 Tag == dwarf::DW_TAG_structure_type ||
1288 Tag == dwarf::DW_TAG_union_type)) {
1289 Flags = Flags | DINode::FlagFwdDecl;
1291 BaseType = getDITypeRefOrNull(Record[6]);
1292 OffsetInBits = Record[9];
1293 Elements = getMDOrNull(Record[11]);
1294 VTableHolder = getDITypeRefOrNull(Record[13]);
1295 TemplateParams = getMDOrNull(Record[14]);
1296 if (Record.size() > 16)
1297 Discriminator = getMDOrNull(Record[16]);
1299 DICompositeType *CT = nullptr;
1301 CT = DICompositeType::buildODRType(
1302 Context, *Identifier, Tag, Name, File, Line, Scope, BaseType,
1303 SizeInBits, AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
1304 VTableHolder, TemplateParams, Discriminator);
1306 // Create a node if we didn't get a lazy ODR type.
1308 CT = GET_OR_DISTINCT(DICompositeType,
1309 (Context, Tag, Name, File, Line, Scope, BaseType,
1310 SizeInBits, AlignInBits, OffsetInBits, Flags,
1311 Elements, RuntimeLang, VTableHolder, TemplateParams,
1312 Identifier, Discriminator));
1313 if (!IsNotUsedInTypeRef && Identifier)
1314 MetadataList.addTypeRef(*Identifier, *cast<DICompositeType>(CT));
1316 MetadataList.assignValue(CT, NextMetadataNo);
1320 case bitc::METADATA_SUBROUTINE_TYPE: {
1321 if (Record.size() < 3 || Record.size() > 4)
1322 return error("Invalid record");
1323 bool IsOldTypeRefArray = Record[0] < 2;
1324 unsigned CC = (Record.size() > 3) ? Record[3] : 0;
1326 IsDistinct = Record[0] & 0x1;
1327 DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[1]);
1328 Metadata *Types = getMDOrNull(Record[2]);
1329 if (LLVM_UNLIKELY(IsOldTypeRefArray))
1330 Types = MetadataList.upgradeTypeRefArray(Types);
1332 MetadataList.assignValue(
1333 GET_OR_DISTINCT(DISubroutineType, (Context, Flags, CC, Types)),
1339 case bitc::METADATA_MODULE: {
1340 if (Record.size() != 6)
1341 return error("Invalid record");
1343 IsDistinct = Record[0];
1344 MetadataList.assignValue(
1345 GET_OR_DISTINCT(DIModule,
1346 (Context, getMDOrNull(Record[1]),
1347 getMDString(Record[2]), getMDString(Record[3]),
1348 getMDString(Record[4]), getMDString(Record[5]))),
1354 case bitc::METADATA_FILE: {
1355 if (Record.size() != 3 && Record.size() != 5 && Record.size() != 6)
1356 return error("Invalid record");
1358 IsDistinct = Record[0];
1359 Optional<DIFile::ChecksumInfo<MDString *>> Checksum;
1360 // The BitcodeWriter writes null bytes into Record[3:4] when the Checksum
1361 // is not present. This matches up with the old internal representation,
1362 // and the old encoding for CSK_None in the ChecksumKind. The new
1363 // representation reserves the value 0 in the ChecksumKind to continue to
1364 // encode None in a backwards-compatible way.
1365 if (Record.size() > 4 && Record[3] && Record[4])
1366 Checksum.emplace(static_cast<DIFile::ChecksumKind>(Record[3]),
1367 getMDString(Record[4]));
1368 MetadataList.assignValue(
1371 (Context, getMDString(Record[1]), getMDString(Record[2]), Checksum,
1372 Record.size() > 5 ? Optional<MDString *>(getMDString(Record[5]))
1378 case bitc::METADATA_COMPILE_UNIT: {
1379 if (Record.size() < 14 || Record.size() > 19)
1380 return error("Invalid record");
1382 // Ignore Record[0], which indicates whether this compile unit is
1383 // distinct. It's always distinct.
1385 auto *CU = DICompileUnit::getDistinct(
1386 Context, Record[1], getMDOrNull(Record[2]), getMDString(Record[3]),
1387 Record[4], getMDString(Record[5]), Record[6], getMDString(Record[7]),
1388 Record[8], getMDOrNull(Record[9]), getMDOrNull(Record[10]),
1389 getMDOrNull(Record[12]), getMDOrNull(Record[13]),
1390 Record.size() <= 15 ? nullptr : getMDOrNull(Record[15]),
1391 Record.size() <= 14 ? 0 : Record[14],
1392 Record.size() <= 16 ? true : Record[16],
1393 Record.size() <= 17 ? false : Record[17],
1394 Record.size() <= 18 ? 0 : Record[18],
1395 Record.size() <= 19 ? 0 : Record[19]);
1397 MetadataList.assignValue(CU, NextMetadataNo);
1400 // Move the Upgrade the list of subprograms.
1401 if (Metadata *SPs = getMDOrNullWithoutPlaceholders(Record[11]))
1402 CUSubprograms.push_back({CU, SPs});
1405 case bitc::METADATA_SUBPROGRAM: {
1406 if (Record.size() < 18 || Record.size() > 21)
1407 return error("Invalid record");
1409 bool HasSPFlags = Record[0] & 4;
1410 DISubprogram::DISPFlags SPFlags =
1412 ? static_cast<DISubprogram::DISPFlags>(Record[9])
1413 : DISubprogram::toSPFlags(
1414 /*IsLocalToUnit=*/Record[7], /*IsDefinition=*/Record[8],
1415 /*IsOptimized=*/Record[14], /*Virtuality=*/Record[11]);
1417 // All definitions should be distinct.
1418 IsDistinct = (Record[0] & 1) || (SPFlags & DISubprogram::SPFlagDefinition);
1419 // Version 1 has a Function as Record[15].
1420 // Version 2 has removed Record[15].
1421 // Version 3 has the Unit as Record[15].
1422 // Version 4 added thisAdjustment.
1423 // Version 5 repacked flags into DISPFlags, changing many element numbers.
1424 bool HasUnit = Record[0] & 2;
1425 if (!HasSPFlags && HasUnit && Record.size() < 19)
1426 return error("Invalid record");
1427 if (HasSPFlags && !HasUnit)
1428 return error("Invalid record");
1429 // Accommodate older formats.
1431 bool HasThisAdj = true;
1432 bool HasThrownTypes = true;
1433 unsigned OffsetA = 0;
1434 unsigned OffsetB = 0;
1438 if (Record.size() >= 19) {
1442 HasThisAdj = Record.size() >= 20;
1443 HasThrownTypes = Record.size() >= 21;
1445 Metadata *CUorFn = getMDOrNull(Record[12 + OffsetB]);
1446 DISubprogram *SP = GET_OR_DISTINCT(
1449 getDITypeRefOrNull(Record[1]), // scope
1450 getMDString(Record[2]), // name
1451 getMDString(Record[3]), // linkageName
1452 getMDOrNull(Record[4]), // file
1454 getMDOrNull(Record[6]), // type
1455 Record[7 + OffsetA], // scopeLine
1456 getDITypeRefOrNull(Record[8 + OffsetA]), // containingType
1457 Record[10 + OffsetA], // virtualIndex
1458 HasThisAdj ? Record[16 + OffsetB] : 0, // thisAdjustment
1459 static_cast<DINode::DIFlags>(Record[11 + OffsetA]),// flags
1461 HasUnit ? CUorFn : nullptr, // unit
1462 getMDOrNull(Record[13 + OffsetB]), // templateParams
1463 getMDOrNull(Record[14 + OffsetB]), // declaration
1464 getMDOrNull(Record[15 + OffsetB]), // retainedNodes
1465 HasThrownTypes ? getMDOrNull(Record[17 + OffsetB])
1466 : nullptr // thrownTypes
1468 MetadataList.assignValue(SP, NextMetadataNo);
1471 // Upgrade sp->function mapping to function->sp mapping.
1473 if (auto *CMD = dyn_cast_or_null<ConstantAsMetadata>(CUorFn))
1474 if (auto *F = dyn_cast<Function>(CMD->getValue())) {
1475 if (F->isMaterializable())
1476 // Defer until materialized; unmaterialized functions may not have
1478 FunctionsWithSPs[F] = SP;
1479 else if (!F->empty())
1480 F->setSubprogram(SP);
1485 case bitc::METADATA_LEXICAL_BLOCK: {
1486 if (Record.size() != 5)
1487 return error("Invalid record");
1489 IsDistinct = Record[0];
1490 MetadataList.assignValue(
1491 GET_OR_DISTINCT(DILexicalBlock,
1492 (Context, getMDOrNull(Record[1]),
1493 getMDOrNull(Record[2]), Record[3], Record[4])),
1498 case bitc::METADATA_LEXICAL_BLOCK_FILE: {
1499 if (Record.size() != 4)
1500 return error("Invalid record");
1502 IsDistinct = Record[0];
1503 MetadataList.assignValue(
1504 GET_OR_DISTINCT(DILexicalBlockFile,
1505 (Context, getMDOrNull(Record[1]),
1506 getMDOrNull(Record[2]), Record[3])),
1511 case bitc::METADATA_NAMESPACE: {
1512 // Newer versions of DINamespace dropped file and line.
1514 if (Record.size() == 3)
1515 Name = getMDString(Record[2]);
1516 else if (Record.size() == 5)
1517 Name = getMDString(Record[3]);
1519 return error("Invalid record");
1521 IsDistinct = Record[0] & 1;
1522 bool ExportSymbols = Record[0] & 2;
1523 MetadataList.assignValue(
1524 GET_OR_DISTINCT(DINamespace,
1525 (Context, getMDOrNull(Record[1]), Name, ExportSymbols)),
1530 case bitc::METADATA_MACRO: {
1531 if (Record.size() != 5)
1532 return error("Invalid record");
1534 IsDistinct = Record[0];
1535 MetadataList.assignValue(
1536 GET_OR_DISTINCT(DIMacro,
1537 (Context, Record[1], Record[2], getMDString(Record[3]),
1538 getMDString(Record[4]))),
1543 case bitc::METADATA_MACRO_FILE: {
1544 if (Record.size() != 5)
1545 return error("Invalid record");
1547 IsDistinct = Record[0];
1548 MetadataList.assignValue(
1549 GET_OR_DISTINCT(DIMacroFile,
1550 (Context, Record[1], Record[2], getMDOrNull(Record[3]),
1551 getMDOrNull(Record[4]))),
1556 case bitc::METADATA_TEMPLATE_TYPE: {
1557 if (Record.size() != 3)
1558 return error("Invalid record");
1560 IsDistinct = Record[0];
1561 MetadataList.assignValue(GET_OR_DISTINCT(DITemplateTypeParameter,
1562 (Context, getMDString(Record[1]),
1563 getDITypeRefOrNull(Record[2]))),
1568 case bitc::METADATA_TEMPLATE_VALUE: {
1569 if (Record.size() != 5)
1570 return error("Invalid record");
1572 IsDistinct = Record[0];
1573 MetadataList.assignValue(
1574 GET_OR_DISTINCT(DITemplateValueParameter,
1575 (Context, Record[1], getMDString(Record[2]),
1576 getDITypeRefOrNull(Record[3]),
1577 getMDOrNull(Record[4]))),
1582 case bitc::METADATA_GLOBAL_VAR: {
1583 if (Record.size() < 11 || Record.size() > 13)
1584 return error("Invalid record");
1586 IsDistinct = Record[0] & 1;
1587 unsigned Version = Record[0] >> 1;
1590 MetadataList.assignValue(
1593 (Context, getMDOrNull(Record[1]), getMDString(Record[2]),
1594 getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
1595 getDITypeRefOrNull(Record[6]), Record[7], Record[8],
1596 getMDOrNull(Record[9]), getMDOrNull(Record[10]), Record[11])),
1600 } else if (Version == 1) {
1601 // No upgrade necessary. A null field will be introduced to indicate
1602 // that no parameter information is available.
1603 MetadataList.assignValue(
1604 GET_OR_DISTINCT(DIGlobalVariable,
1605 (Context, getMDOrNull(Record[1]),
1606 getMDString(Record[2]), getMDString(Record[3]),
1607 getMDOrNull(Record[4]), Record[5],
1608 getDITypeRefOrNull(Record[6]), Record[7], Record[8],
1609 getMDOrNull(Record[10]), nullptr, Record[11])),
1613 } else if (Version == 0) {
1614 // Upgrade old metadata, which stored a global variable reference or a
1615 // ConstantInt here.
1616 NeedUpgradeToDIGlobalVariableExpression = true;
1617 Metadata *Expr = getMDOrNull(Record[9]);
1618 uint32_t AlignInBits = 0;
1619 if (Record.size() > 11) {
1620 if (Record[11] > (uint64_t)std::numeric_limits<uint32_t>::max())
1621 return error("Alignment value is too large");
1622 AlignInBits = Record[11];
1624 GlobalVariable *Attach = nullptr;
1625 if (auto *CMD = dyn_cast_or_null<ConstantAsMetadata>(Expr)) {
1626 if (auto *GV = dyn_cast<GlobalVariable>(CMD->getValue())) {
1629 } else if (auto *CI = dyn_cast<ConstantInt>(CMD->getValue())) {
1630 Expr = DIExpression::get(Context,
1631 {dwarf::DW_OP_constu, CI->getZExtValue(),
1632 dwarf::DW_OP_stack_value});
1637 DIGlobalVariable *DGV = GET_OR_DISTINCT(
1639 (Context, getMDOrNull(Record[1]), getMDString(Record[2]),
1640 getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
1641 getDITypeRefOrNull(Record[6]), Record[7], Record[8],
1642 getMDOrNull(Record[10]), nullptr, AlignInBits));
1644 DIGlobalVariableExpression *DGVE = nullptr;
1646 DGVE = DIGlobalVariableExpression::getDistinct(
1647 Context, DGV, Expr ? Expr : DIExpression::get(Context, {}));
1649 Attach->addDebugInfo(DGVE);
1651 auto *MDNode = Expr ? cast<Metadata>(DGVE) : cast<Metadata>(DGV);
1652 MetadataList.assignValue(MDNode, NextMetadataNo);
1655 return error("Invalid record");
1659 case bitc::METADATA_LOCAL_VAR: {
1660 // 10th field is for the obseleted 'inlinedAt:' field.
1661 if (Record.size() < 8 || Record.size() > 10)
1662 return error("Invalid record");
1664 IsDistinct = Record[0] & 1;
1665 bool HasAlignment = Record[0] & 2;
1666 // 2nd field used to be an artificial tag, either DW_TAG_auto_variable or
1667 // DW_TAG_arg_variable, if we have alignment flag encoded it means, that
1668 // this is newer version of record which doesn't have artificial tag.
1669 bool HasTag = !HasAlignment && Record.size() > 8;
1670 DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[7 + HasTag]);
1671 uint32_t AlignInBits = 0;
1673 if (Record[8 + HasTag] > (uint64_t)std::numeric_limits<uint32_t>::max())
1674 return error("Alignment value is too large");
1675 AlignInBits = Record[8 + HasTag];
1677 MetadataList.assignValue(
1678 GET_OR_DISTINCT(DILocalVariable,
1679 (Context, getMDOrNull(Record[1 + HasTag]),
1680 getMDString(Record[2 + HasTag]),
1681 getMDOrNull(Record[3 + HasTag]), Record[4 + HasTag],
1682 getDITypeRefOrNull(Record[5 + HasTag]),
1683 Record[6 + HasTag], Flags, AlignInBits)),
1688 case bitc::METADATA_LABEL: {
1689 if (Record.size() != 5)
1690 return error("Invalid record");
1692 IsDistinct = Record[0] & 1;
1693 MetadataList.assignValue(
1694 GET_OR_DISTINCT(DILabel,
1695 (Context, getMDOrNull(Record[1]),
1696 getMDString(Record[2]),
1697 getMDOrNull(Record[3]), Record[4])),
1702 case bitc::METADATA_EXPRESSION: {
1703 if (Record.size() < 1)
1704 return error("Invalid record");
1706 IsDistinct = Record[0] & 1;
1707 uint64_t Version = Record[0] >> 1;
1708 auto Elts = MutableArrayRef<uint64_t>(Record).slice(1);
1710 SmallVector<uint64_t, 6> Buffer;
1711 if (Error Err = upgradeDIExpression(Version, Elts, Buffer))
1714 MetadataList.assignValue(
1715 GET_OR_DISTINCT(DIExpression, (Context, Elts)), NextMetadataNo);
1719 case bitc::METADATA_GLOBAL_VAR_EXPR: {
1720 if (Record.size() != 3)
1721 return error("Invalid record");
1723 IsDistinct = Record[0];
1724 Metadata *Expr = getMDOrNull(Record[2]);
1726 Expr = DIExpression::get(Context, {});
1727 MetadataList.assignValue(
1728 GET_OR_DISTINCT(DIGlobalVariableExpression,
1729 (Context, getMDOrNull(Record[1]), Expr)),
1734 case bitc::METADATA_OBJC_PROPERTY: {
1735 if (Record.size() != 8)
1736 return error("Invalid record");
1738 IsDistinct = Record[0];
1739 MetadataList.assignValue(
1740 GET_OR_DISTINCT(DIObjCProperty,
1741 (Context, getMDString(Record[1]),
1742 getMDOrNull(Record[2]), Record[3],
1743 getMDString(Record[4]), getMDString(Record[5]),
1744 Record[6], getDITypeRefOrNull(Record[7]))),
1749 case bitc::METADATA_IMPORTED_ENTITY: {
1750 if (Record.size() != 6 && Record.size() != 7)
1751 return error("Invalid record");
1753 IsDistinct = Record[0];
1754 bool HasFile = (Record.size() == 7);
1755 MetadataList.assignValue(
1756 GET_OR_DISTINCT(DIImportedEntity,
1757 (Context, Record[1], getMDOrNull(Record[2]),
1758 getDITypeRefOrNull(Record[3]),
1759 HasFile ? getMDOrNull(Record[6]) : nullptr,
1760 HasFile ? Record[4] : 0, getMDString(Record[5]))),
1765 case bitc::METADATA_STRING_OLD: {
1766 std::string String(Record.begin(), Record.end());
1768 // Test for upgrading !llvm.loop.
1769 HasSeenOldLoopTags |= mayBeOldLoopAttachmentTag(String);
1770 ++NumMDStringLoaded;
1771 Metadata *MD = MDString::get(Context, String);
1772 MetadataList.assignValue(MD, NextMetadataNo);
1776 case bitc::METADATA_STRINGS: {
1777 auto CreateNextMDString = [&](StringRef Str) {
1778 ++NumMDStringLoaded;
1779 MetadataList.assignValue(MDString::get(Context, Str), NextMetadataNo);
1782 if (Error Err = parseMetadataStrings(Record, Blob, CreateNextMDString))
1786 case bitc::METADATA_GLOBAL_DECL_ATTACHMENT: {
1787 if (Record.size() % 2 == 0)
1788 return error("Invalid record");
1789 unsigned ValueID = Record[0];
1790 if (ValueID >= ValueList.size())
1791 return error("Invalid record");
1792 if (auto *GO = dyn_cast<GlobalObject>(ValueList[ValueID]))
1793 if (Error Err = parseGlobalObjectAttachment(
1794 *GO, ArrayRef<uint64_t>(Record).slice(1)))
1798 case bitc::METADATA_KIND: {
1799 // Support older bitcode files that had METADATA_KIND records in a
1800 // block with METADATA_BLOCK_ID.
1801 if (Error Err = parseMetadataKindRecord(Record))
1806 return Error::success();
1807 #undef GET_OR_DISTINCT
1810 Error MetadataLoader::MetadataLoaderImpl::parseMetadataStrings(
1811 ArrayRef<uint64_t> Record, StringRef Blob,
1812 function_ref<void(StringRef)> CallBack) {
1813 // All the MDStrings in the block are emitted together in a single
1814 // record. The strings are concatenated and stored in a blob along with
1816 if (Record.size() != 2)
1817 return error("Invalid record: metadata strings layout");
1819 unsigned NumStrings = Record[0];
1820 unsigned StringsOffset = Record[1];
1822 return error("Invalid record: metadata strings with no strings");
1823 if (StringsOffset > Blob.size())
1824 return error("Invalid record: metadata strings corrupt offset");
1826 StringRef Lengths = Blob.slice(0, StringsOffset);
1827 SimpleBitstreamCursor R(Lengths);
1829 StringRef Strings = Blob.drop_front(StringsOffset);
1831 if (R.AtEndOfStream())
1832 return error("Invalid record: metadata strings bad length");
1834 unsigned Size = R.ReadVBR(6);
1835 if (Strings.size() < Size)
1836 return error("Invalid record: metadata strings truncated chars");
1838 CallBack(Strings.slice(0, Size));
1839 Strings = Strings.drop_front(Size);
1840 } while (--NumStrings);
1842 return Error::success();
1845 Error MetadataLoader::MetadataLoaderImpl::parseGlobalObjectAttachment(
1846 GlobalObject &GO, ArrayRef<uint64_t> Record) {
1847 assert(Record.size() % 2 == 0);
1848 for (unsigned I = 0, E = Record.size(); I != E; I += 2) {
1849 auto K = MDKindMap.find(Record[I]);
1850 if (K == MDKindMap.end())
1851 return error("Invalid ID");
1852 MDNode *MD = MetadataList.getMDNodeFwdRefOrNull(Record[I + 1]);
1854 return error("Invalid metadata attachment: expect fwd ref to MDNode");
1855 GO.addMetadata(K->second, *MD);
1857 return Error::success();
1860 /// Parse metadata attachments.
1861 Error MetadataLoader::MetadataLoaderImpl::parseMetadataAttachment(
1862 Function &F, const SmallVectorImpl<Instruction *> &InstructionList) {
1863 if (Stream.EnterSubBlock(bitc::METADATA_ATTACHMENT_ID))
1864 return error("Invalid record");
1866 SmallVector<uint64_t, 64> Record;
1867 PlaceholderQueue Placeholders;
1870 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1872 switch (Entry.Kind) {
1873 case BitstreamEntry::SubBlock: // Handled for us already.
1874 case BitstreamEntry::Error:
1875 return error("Malformed block");
1876 case BitstreamEntry::EndBlock:
1877 resolveForwardRefsAndPlaceholders(Placeholders);
1878 return Error::success();
1879 case BitstreamEntry::Record:
1880 // The interesting case.
1884 // Read a metadata attachment record.
1886 ++NumMDRecordLoaded;
1887 switch (Stream.readRecord(Entry.ID, Record)) {
1888 default: // Default behavior: ignore.
1890 case bitc::METADATA_ATTACHMENT: {
1891 unsigned RecordLength = Record.size();
1893 return error("Invalid record");
1894 if (RecordLength % 2 == 0) {
1895 // A function attachment.
1896 if (Error Err = parseGlobalObjectAttachment(F, Record))
1901 // An instruction attachment.
1902 Instruction *Inst = InstructionList[Record[0]];
1903 for (unsigned i = 1; i != RecordLength; i = i + 2) {
1904 unsigned Kind = Record[i];
1905 DenseMap<unsigned, unsigned>::iterator I = MDKindMap.find(Kind);
1906 if (I == MDKindMap.end())
1907 return error("Invalid ID");
1908 if (I->second == LLVMContext::MD_tbaa && StripTBAA)
1911 auto Idx = Record[i + 1];
1912 if (Idx < (MDStringRef.size() + GlobalMetadataBitPosIndex.size()) &&
1913 !MetadataList.lookup(Idx)) {
1914 // Load the attachment if it is in the lazy-loadable range and hasn't
1916 lazyLoadOneMetadata(Idx, Placeholders);
1917 resolveForwardRefsAndPlaceholders(Placeholders);
1920 Metadata *Node = MetadataList.getMetadataFwdRef(Idx);
1921 if (isa<LocalAsMetadata>(Node))
1922 // Drop the attachment. This used to be legal, but there's no
1925 MDNode *MD = dyn_cast_or_null<MDNode>(Node);
1927 return error("Invalid metadata attachment");
1929 if (HasSeenOldLoopTags && I->second == LLVMContext::MD_loop)
1930 MD = upgradeInstructionLoopAttachment(*MD);
1932 if (I->second == LLVMContext::MD_tbaa) {
1933 assert(!MD->isTemporary() && "should load MDs before attachments");
1934 MD = UpgradeTBAANode(*MD);
1936 Inst->setMetadata(I->second, MD);
1944 /// Parse a single METADATA_KIND record, inserting result in MDKindMap.
1945 Error MetadataLoader::MetadataLoaderImpl::parseMetadataKindRecord(
1946 SmallVectorImpl<uint64_t> &Record) {
1947 if (Record.size() < 2)
1948 return error("Invalid record");
1950 unsigned Kind = Record[0];
1951 SmallString<8> Name(Record.begin() + 1, Record.end());
1953 unsigned NewKind = TheModule.getMDKindID(Name.str());
1954 if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second)
1955 return error("Conflicting METADATA_KIND records");
1956 return Error::success();
1959 /// Parse the metadata kinds out of the METADATA_KIND_BLOCK.
1960 Error MetadataLoader::MetadataLoaderImpl::parseMetadataKinds() {
1961 if (Stream.EnterSubBlock(bitc::METADATA_KIND_BLOCK_ID))
1962 return error("Invalid record");
1964 SmallVector<uint64_t, 64> Record;
1966 // Read all the records.
1968 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1970 switch (Entry.Kind) {
1971 case BitstreamEntry::SubBlock: // Handled for us already.
1972 case BitstreamEntry::Error:
1973 return error("Malformed block");
1974 case BitstreamEntry::EndBlock:
1975 return Error::success();
1976 case BitstreamEntry::Record:
1977 // The interesting case.
1983 ++NumMDRecordLoaded;
1984 unsigned Code = Stream.readRecord(Entry.ID, Record);
1986 default: // Default behavior: ignore.
1988 case bitc::METADATA_KIND: {
1989 if (Error Err = parseMetadataKindRecord(Record))
1997 MetadataLoader &MetadataLoader::operator=(MetadataLoader &&RHS) {
1998 Pimpl = std::move(RHS.Pimpl);
2001 MetadataLoader::MetadataLoader(MetadataLoader &&RHS)
2002 : Pimpl(std::move(RHS.Pimpl)) {}
2004 MetadataLoader::~MetadataLoader() = default;
2005 MetadataLoader::MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
2006 BitcodeReaderValueList &ValueList,
2008 std::function<Type *(unsigned)> getTypeByID)
2009 : Pimpl(llvm::make_unique<MetadataLoaderImpl>(
2010 Stream, TheModule, ValueList, std::move(getTypeByID), IsImporting)) {}
2012 Error MetadataLoader::parseMetadata(bool ModuleLevel) {
2013 return Pimpl->parseMetadata(ModuleLevel);
2016 bool MetadataLoader::hasFwdRefs() const { return Pimpl->hasFwdRefs(); }
2018 /// Return the given metadata, creating a replaceable forward reference if
2020 Metadata *MetadataLoader::getMetadataFwdRefOrLoad(unsigned Idx) {
2021 return Pimpl->getMetadataFwdRefOrLoad(Idx);
2024 DISubprogram *MetadataLoader::lookupSubprogramForFunction(Function *F) {
2025 return Pimpl->lookupSubprogramForFunction(F);
2028 Error MetadataLoader::parseMetadataAttachment(
2029 Function &F, const SmallVectorImpl<Instruction *> &InstructionList) {
2030 return Pimpl->parseMetadataAttachment(F, InstructionList);
2033 Error MetadataLoader::parseMetadataKinds() {
2034 return Pimpl->parseMetadataKinds();
2037 void MetadataLoader::setStripTBAA(bool StripTBAA) {
2038 return Pimpl->setStripTBAA(StripTBAA);
2041 bool MetadataLoader::isStrippingTBAA() { return Pimpl->isStrippingTBAA(); }
2043 unsigned MetadataLoader::size() const { return Pimpl->size(); }
2044 void MetadataLoader::shrinkTo(unsigned N) { return Pimpl->shrinkTo(N); }
2046 void MetadataLoader::upgradeDebugIntrinsics(Function &F) {
2047 return Pimpl->upgradeDebugIntrinsics(F);