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-rw-r--r--contrib/llvm/lib/Bitcode/Reader/MetadataLoader.cpp1398
1 files changed, 1398 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Bitcode/Reader/MetadataLoader.cpp b/contrib/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
new file mode 100644
index 000000000000..5da421a79b7b
--- /dev/null
+++ b/contrib/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
@@ -0,0 +1,1398 @@
+//===- MetadataLoader.cpp - Internal BitcodeReader implementation ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MetadataLoader.h"
+#include "ValueList.h"
+
+#include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitcode/LLVMBitCodes.h"
+#include "llvm/IR/Argument.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/AutoUpgrade.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/Comdat.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DebugInfo.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/IR/DebugLoc.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GVMaterializer.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/GlobalIFunc.h"
+#include "llvm/IR/GlobalIndirectSymbol.h"
+#include "llvm/IR/GlobalObject.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/InlineAsm.h"
+#include "llvm/IR/InstrTypes.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/ModuleSummaryIndex.h"
+#include "llvm/IR/OperandTraits.h"
+#include "llvm/IR/Operator.h"
+#include "llvm/IR/TrackingMDRef.h"
+#include "llvm/IR/Type.h"
+#include "llvm/IR/ValueHandle.h"
+#include "llvm/Support/AtomicOrdering.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <limits>
+#include <map>
+#include <memory>
+#include <string>
+#include <system_error>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+using namespace llvm;
+
+/// Flag whether we need to import full type definitions for ThinLTO.
+/// Currently needed for Darwin and LLDB.
+static cl::opt<bool> ImportFullTypeDefinitions(
+ "import-full-type-definitions", cl::init(false), cl::Hidden,
+ cl::desc("Import full type definitions for ThinLTO."));
+
+namespace {
+
+static int64_t unrotateSign(uint64_t U) { return U & 1 ? ~(U >> 1) : U >> 1; }
+
+class BitcodeReaderMetadataList {
+ /// Array of metadata references.
+ ///
+ /// Don't use std::vector here. Some versions of libc++ copy (instead of
+ /// move) on resize, and TrackingMDRef is very expensive to copy.
+ SmallVector<TrackingMDRef, 1> MetadataPtrs;
+
+ /// The set of indices in MetadataPtrs above of forward references that were
+ /// generated.
+ SmallDenseSet<unsigned, 1> ForwardReference;
+
+ /// The set of indices in MetadataPtrs above of Metadata that need to be
+ /// resolved.
+ SmallDenseSet<unsigned, 1> UnresolvedNodes;
+
+ /// Structures for resolving old type refs.
+ struct {
+ SmallDenseMap<MDString *, TempMDTuple, 1> Unknown;
+ SmallDenseMap<MDString *, DICompositeType *, 1> Final;
+ SmallDenseMap<MDString *, DICompositeType *, 1> FwdDecls;
+ SmallVector<std::pair<TrackingMDRef, TempMDTuple>, 1> Arrays;
+ } OldTypeRefs;
+
+ LLVMContext &Context;
+
+public:
+ BitcodeReaderMetadataList(LLVMContext &C) : Context(C) {}
+
+ // vector compatibility methods
+ unsigned size() const { return MetadataPtrs.size(); }
+ void resize(unsigned N) { MetadataPtrs.resize(N); }
+ void push_back(Metadata *MD) { MetadataPtrs.emplace_back(MD); }
+ void clear() { MetadataPtrs.clear(); }
+ Metadata *back() const { return MetadataPtrs.back(); }
+ void pop_back() { MetadataPtrs.pop_back(); }
+ bool empty() const { return MetadataPtrs.empty(); }
+
+ Metadata *operator[](unsigned i) const {
+ assert(i < MetadataPtrs.size());
+ return MetadataPtrs[i];
+ }
+
+ Metadata *lookup(unsigned I) const {
+ if (I < MetadataPtrs.size())
+ return MetadataPtrs[I];
+ return nullptr;
+ }
+
+ void shrinkTo(unsigned N) {
+ assert(N <= size() && "Invalid shrinkTo request!");
+ assert(ForwardReference.empty() && "Unexpected forward refs");
+ assert(UnresolvedNodes.empty() && "Unexpected unresolved node");
+ MetadataPtrs.resize(N);
+ }
+
+ /// Return the given metadata, creating a replaceable forward reference if
+ /// necessary.
+ Metadata *getMetadataFwdRef(unsigned Idx);
+
+ /// Return the the given metadata only if it is fully resolved.
+ ///
+ /// Gives the same result as \a lookup(), unless \a MDNode::isResolved()
+ /// would give \c false.
+ Metadata *getMetadataIfResolved(unsigned Idx);
+
+ MDNode *getMDNodeFwdRefOrNull(unsigned Idx);
+ void assignValue(Metadata *MD, unsigned Idx);
+ void tryToResolveCycles();
+ bool hasFwdRefs() const { return !ForwardReference.empty(); }
+
+ /// Upgrade a type that had an MDString reference.
+ void addTypeRef(MDString &UUID, DICompositeType &CT);
+
+ /// Upgrade a type that had an MDString reference.
+ Metadata *upgradeTypeRef(Metadata *MaybeUUID);
+
+ /// Upgrade a type ref array that may have MDString references.
+ Metadata *upgradeTypeRefArray(Metadata *MaybeTuple);
+
+private:
+ Metadata *resolveTypeRefArray(Metadata *MaybeTuple);
+};
+
+void BitcodeReaderMetadataList::assignValue(Metadata *MD, unsigned Idx) {
+ if (auto *MDN = dyn_cast<MDNode>(MD))
+ if (!MDN->isResolved())
+ UnresolvedNodes.insert(Idx);
+
+ if (Idx == size()) {
+ push_back(MD);
+ return;
+ }
+
+ if (Idx >= size())
+ resize(Idx + 1);
+
+ TrackingMDRef &OldMD = MetadataPtrs[Idx];
+ if (!OldMD) {
+ OldMD.reset(MD);
+ return;
+ }
+
+ // If there was a forward reference to this value, replace it.
+ TempMDTuple PrevMD(cast<MDTuple>(OldMD.get()));
+ PrevMD->replaceAllUsesWith(MD);
+ ForwardReference.erase(Idx);
+}
+
+Metadata *BitcodeReaderMetadataList::getMetadataFwdRef(unsigned Idx) {
+ if (Idx >= size())
+ resize(Idx + 1);
+
+ if (Metadata *MD = MetadataPtrs[Idx])
+ return MD;
+
+ // Track forward refs to be resolved later.
+ ForwardReference.insert(Idx);
+
+ // Create and return a placeholder, which will later be RAUW'd.
+ Metadata *MD = MDNode::getTemporary(Context, None).release();
+ MetadataPtrs[Idx].reset(MD);
+ return MD;
+}
+
+Metadata *BitcodeReaderMetadataList::getMetadataIfResolved(unsigned Idx) {
+ Metadata *MD = lookup(Idx);
+ if (auto *N = dyn_cast_or_null<MDNode>(MD))
+ if (!N->isResolved())
+ return nullptr;
+ return MD;
+}
+
+MDNode *BitcodeReaderMetadataList::getMDNodeFwdRefOrNull(unsigned Idx) {
+ return dyn_cast_or_null<MDNode>(getMetadataFwdRef(Idx));
+}
+
+void BitcodeReaderMetadataList::tryToResolveCycles() {
+ if (!ForwardReference.empty())
+ // Still forward references... can't resolve cycles.
+ return;
+
+ // Give up on finding a full definition for any forward decls that remain.
+ for (const auto &Ref : OldTypeRefs.FwdDecls)
+ OldTypeRefs.Final.insert(Ref);
+ OldTypeRefs.FwdDecls.clear();
+
+ // Upgrade from old type ref arrays. In strange cases, this could add to
+ // OldTypeRefs.Unknown.
+ for (const auto &Array : OldTypeRefs.Arrays)
+ Array.second->replaceAllUsesWith(resolveTypeRefArray(Array.first.get()));
+ OldTypeRefs.Arrays.clear();
+
+ // Replace old string-based type refs with the resolved node, if possible.
+ // If we haven't seen the node, leave it to the verifier to complain about
+ // the invalid string reference.
+ for (const auto &Ref : OldTypeRefs.Unknown) {
+ if (DICompositeType *CT = OldTypeRefs.Final.lookup(Ref.first))
+ Ref.second->replaceAllUsesWith(CT);
+ else
+ Ref.second->replaceAllUsesWith(Ref.first);
+ }
+ OldTypeRefs.Unknown.clear();
+
+ if (UnresolvedNodes.empty())
+ // Nothing to do.
+ return;
+
+ // Resolve any cycles.
+ for (unsigned I : UnresolvedNodes) {
+ auto &MD = MetadataPtrs[I];
+ auto *N = dyn_cast_or_null<MDNode>(MD);
+ if (!N)
+ continue;
+
+ assert(!N->isTemporary() && "Unexpected forward reference");
+ N->resolveCycles();
+ }
+
+ // Make sure we return early again until there's another unresolved ref.
+ UnresolvedNodes.clear();
+}
+
+void BitcodeReaderMetadataList::addTypeRef(MDString &UUID,
+ DICompositeType &CT) {
+ assert(CT.getRawIdentifier() == &UUID && "Mismatched UUID");
+ if (CT.isForwardDecl())
+ OldTypeRefs.FwdDecls.insert(std::make_pair(&UUID, &CT));
+ else
+ OldTypeRefs.Final.insert(std::make_pair(&UUID, &CT));
+}
+
+Metadata *BitcodeReaderMetadataList::upgradeTypeRef(Metadata *MaybeUUID) {
+ auto *UUID = dyn_cast_or_null<MDString>(MaybeUUID);
+ if (LLVM_LIKELY(!UUID))
+ return MaybeUUID;
+
+ if (auto *CT = OldTypeRefs.Final.lookup(UUID))
+ return CT;
+
+ auto &Ref = OldTypeRefs.Unknown[UUID];
+ if (!Ref)
+ Ref = MDNode::getTemporary(Context, None);
+ return Ref.get();
+}
+
+Metadata *BitcodeReaderMetadataList::upgradeTypeRefArray(Metadata *MaybeTuple) {
+ auto *Tuple = dyn_cast_or_null<MDTuple>(MaybeTuple);
+ if (!Tuple || Tuple->isDistinct())
+ return MaybeTuple;
+
+ // Look through the array immediately if possible.
+ if (!Tuple->isTemporary())
+ return resolveTypeRefArray(Tuple);
+
+ // Create and return a placeholder to use for now. Eventually
+ // resolveTypeRefArrays() will be resolve this forward reference.
+ OldTypeRefs.Arrays.emplace_back(
+ std::piecewise_construct, std::forward_as_tuple(Tuple),
+ std::forward_as_tuple(MDTuple::getTemporary(Context, None)));
+ return OldTypeRefs.Arrays.back().second.get();
+}
+
+Metadata *BitcodeReaderMetadataList::resolveTypeRefArray(Metadata *MaybeTuple) {
+ auto *Tuple = dyn_cast_or_null<MDTuple>(MaybeTuple);
+ if (!Tuple || Tuple->isDistinct())
+ return MaybeTuple;
+
+ // Look through the DITypeRefArray, upgrading each DITypeRef.
+ SmallVector<Metadata *, 32> Ops;
+ Ops.reserve(Tuple->getNumOperands());
+ for (Metadata *MD : Tuple->operands())
+ Ops.push_back(upgradeTypeRef(MD));
+
+ return MDTuple::get(Context, Ops);
+}
+
+namespace {
+
+class PlaceholderQueue {
+ // Placeholders would thrash around when moved, so store in a std::deque
+ // instead of some sort of vector.
+ std::deque<DistinctMDOperandPlaceholder> PHs;
+
+public:
+ DistinctMDOperandPlaceholder &getPlaceholderOp(unsigned ID);
+ void flush(BitcodeReaderMetadataList &MetadataList);
+};
+
+} // end anonymous namespace
+
+DistinctMDOperandPlaceholder &PlaceholderQueue::getPlaceholderOp(unsigned ID) {
+ PHs.emplace_back(ID);
+ return PHs.back();
+}
+
+void PlaceholderQueue::flush(BitcodeReaderMetadataList &MetadataList) {
+ while (!PHs.empty()) {
+ auto *MD = MetadataList.lookup(PHs.front().getID());
+ assert(MD && "Flushing placeholder on unassigned MD");
+#ifndef NDEBUG
+ if (auto *MDN = dyn_cast<MDNode>(MD))
+ assert(MDN->isResolved() &&
+ "Flushing Placeholder while cycles aren't resolved");
+#endif
+ PHs.front().replaceUseWith(MD);
+ PHs.pop_front();
+ }
+}
+
+} // anonynous namespace
+
+class MetadataLoader::MetadataLoaderImpl {
+ BitcodeReaderMetadataList MetadataList;
+ BitcodeReaderValueList &ValueList;
+ BitstreamCursor &Stream;
+ LLVMContext &Context;
+ Module &TheModule;
+ std::function<Type *(unsigned)> getTypeByID;
+
+ // Keep mapping of seens pair of old-style CU <-> SP, and update pointers to
+ // point from SP to CU after a block is completly parsed.
+ std::vector<std::pair<DICompileUnit *, Metadata *>> CUSubprograms;
+
+ /// Functions that need to be matched with subprograms when upgrading old
+ /// metadata.
+ SmallDenseMap<Function *, DISubprogram *, 16> FunctionsWithSPs;
+
+ // Map the bitcode's custom MDKind ID to the Module's MDKind ID.
+ DenseMap<unsigned, unsigned> MDKindMap;
+
+ bool StripTBAA = false;
+ bool HasSeenOldLoopTags = false;
+
+ /// True if metadata is being parsed for a module being ThinLTO imported.
+ bool IsImporting = false;
+
+ Error parseOneMetadata(SmallVectorImpl<uint64_t> &Record, unsigned Code,
+ PlaceholderQueue &Placeholders, StringRef Blob,
+ bool ModuleLevel, unsigned &NextMetadataNo);
+ Error parseMetadataStrings(ArrayRef<uint64_t> Record, StringRef Blob,
+ unsigned &NextMetadataNo);
+ Error parseGlobalObjectAttachment(GlobalObject &GO,
+ ArrayRef<uint64_t> Record);
+ Error parseMetadataKindRecord(SmallVectorImpl<uint64_t> &Record);
+
+public:
+ MetadataLoaderImpl(BitstreamCursor &Stream, Module &TheModule,
+ BitcodeReaderValueList &ValueList,
+ std::function<Type *(unsigned)> getTypeByID,
+ bool IsImporting)
+ : MetadataList(TheModule.getContext()), ValueList(ValueList),
+ Stream(Stream), Context(TheModule.getContext()), TheModule(TheModule),
+ getTypeByID(getTypeByID), IsImporting(IsImporting) {}
+
+ Error parseMetadata(bool ModuleLevel);
+
+ bool hasFwdRefs() const { return MetadataList.hasFwdRefs(); }
+ Metadata *getMetadataFwdRef(unsigned Idx) {
+ return MetadataList.getMetadataFwdRef(Idx);
+ }
+
+ MDNode *getMDNodeFwdRefOrNull(unsigned Idx) {
+ return MetadataList.getMDNodeFwdRefOrNull(Idx);
+ }
+
+ DISubprogram *lookupSubprogramForFunction(Function *F) {
+ return FunctionsWithSPs.lookup(F);
+ }
+
+ bool hasSeenOldLoopTags() { return HasSeenOldLoopTags; }
+
+ Error parseMetadataAttachment(
+ Function &F, const SmallVectorImpl<Instruction *> &InstructionList);
+
+ Error parseMetadataKinds();
+
+ void setStripTBAA(bool Value) { StripTBAA = Value; }
+ bool isStrippingTBAA() { return StripTBAA; }
+
+ unsigned size() const { return MetadataList.size(); }
+ void shrinkTo(unsigned N) { MetadataList.shrinkTo(N); }
+};
+
+Error error(const Twine &Message) {
+ return make_error<StringError>(
+ Message, make_error_code(BitcodeError::CorruptedBitcode));
+}
+
+/// Parse a METADATA_BLOCK. If ModuleLevel is true then we are parsing
+/// module level metadata.
+Error MetadataLoader::MetadataLoaderImpl::parseMetadata(bool ModuleLevel) {
+ if (!ModuleLevel && MetadataList.hasFwdRefs())
+ return error("Invalid metadata: fwd refs into function blocks");
+
+ if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID))
+ return error("Invalid record");
+
+ unsigned NextMetadataNo = MetadataList.size();
+ SmallVector<uint64_t, 64> Record;
+
+ PlaceholderQueue Placeholders;
+
+ // Read all the records.
+ while (true) {
+ BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
+
+ switch (Entry.Kind) {
+ case BitstreamEntry::SubBlock: // Handled for us already.
+ case BitstreamEntry::Error:
+ return error("Malformed block");
+ case BitstreamEntry::EndBlock:
+ // Upgrade old-style CU <-> SP pointers to point from SP to CU.
+ for (auto CU_SP : CUSubprograms)
+ if (auto *SPs = dyn_cast_or_null<MDTuple>(CU_SP.second))
+ for (auto &Op : SPs->operands())
+ if (auto *SP = dyn_cast_or_null<MDNode>(Op))
+ SP->replaceOperandWith(7, CU_SP.first);
+ CUSubprograms.clear();
+
+ MetadataList.tryToResolveCycles();
+ Placeholders.flush(MetadataList);
+ return Error::success();
+ case BitstreamEntry::Record:
+ // The interesting case.
+ break;
+ }
+
+ // Read a record.
+ Record.clear();
+ StringRef Blob;
+ unsigned Code = Stream.readRecord(Entry.ID, Record, &Blob);
+ if (Error Err = parseOneMetadata(Record, Code, Placeholders, Blob,
+ ModuleLevel, NextMetadataNo))
+ return Err;
+ }
+}
+
+Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
+ SmallVectorImpl<uint64_t> &Record, unsigned Code,
+ PlaceholderQueue &Placeholders, StringRef Blob, bool ModuleLevel,
+ unsigned &NextMetadataNo) {
+
+ bool IsDistinct = false;
+ auto getMD = [&](unsigned ID) -> Metadata * {
+ if (!IsDistinct)
+ return MetadataList.getMetadataFwdRef(ID);
+ if (auto *MD = MetadataList.getMetadataIfResolved(ID))
+ return MD;
+ return &Placeholders.getPlaceholderOp(ID);
+ };
+ auto getMDOrNull = [&](unsigned ID) -> Metadata * {
+ if (ID)
+ return getMD(ID - 1);
+ return nullptr;
+ };
+ auto getMDOrNullWithoutPlaceholders = [&](unsigned ID) -> Metadata * {
+ if (ID)
+ return MetadataList.getMetadataFwdRef(ID - 1);
+ return nullptr;
+ };
+ auto getMDString = [&](unsigned ID) -> MDString * {
+ // This requires that the ID is not really a forward reference. In
+ // particular, the MDString must already have been resolved.
+ return cast_or_null<MDString>(getMDOrNull(ID));
+ };
+
+ // Support for old type refs.
+ auto getDITypeRefOrNull = [&](unsigned ID) {
+ return MetadataList.upgradeTypeRef(getMDOrNull(ID));
+ };
+
+#define GET_OR_DISTINCT(CLASS, ARGS) \
+ (IsDistinct ? CLASS::getDistinct ARGS : CLASS::get ARGS)
+
+ switch (Code) {
+ default: // Default behavior: ignore.
+ break;
+ case bitc::METADATA_NAME: {
+ // Read name of the named metadata.
+ SmallString<8> Name(Record.begin(), Record.end());
+ Record.clear();
+ Code = Stream.ReadCode();
+
+ unsigned NextBitCode = Stream.readRecord(Code, Record);
+ if (NextBitCode != bitc::METADATA_NAMED_NODE)
+ return error("METADATA_NAME not followed by METADATA_NAMED_NODE");
+
+ // Read named metadata elements.
+ unsigned Size = Record.size();
+ NamedMDNode *NMD = TheModule.getOrInsertNamedMetadata(Name);
+ for (unsigned i = 0; i != Size; ++i) {
+ MDNode *MD = MetadataList.getMDNodeFwdRefOrNull(Record[i]);
+ if (!MD)
+ return error("Invalid record");
+ NMD->addOperand(MD);
+ }
+ break;
+ }
+ case bitc::METADATA_OLD_FN_NODE: {
+ // FIXME: Remove in 4.0.
+ // This is a LocalAsMetadata record, the only type of function-local
+ // metadata.
+ if (Record.size() % 2 == 1)
+ return error("Invalid record");
+
+ // If this isn't a LocalAsMetadata record, we're dropping it. This used
+ // to be legal, but there's no upgrade path.
+ auto dropRecord = [&] {
+ MetadataList.assignValue(MDNode::get(Context, None), NextMetadataNo++);
+ };
+ if (Record.size() != 2) {
+ dropRecord();
+ break;
+ }
+
+ Type *Ty = getTypeByID(Record[0]);
+ if (Ty->isMetadataTy() || Ty->isVoidTy()) {
+ dropRecord();
+ break;
+ }
+
+ MetadataList.assignValue(
+ LocalAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_OLD_NODE: {
+ // FIXME: Remove in 4.0.
+ if (Record.size() % 2 == 1)
+ return error("Invalid record");
+
+ unsigned Size = Record.size();
+ SmallVector<Metadata *, 8> Elts;
+ for (unsigned i = 0; i != Size; i += 2) {
+ Type *Ty = getTypeByID(Record[i]);
+ if (!Ty)
+ return error("Invalid record");
+ if (Ty->isMetadataTy())
+ Elts.push_back(getMD(Record[i + 1]));
+ else if (!Ty->isVoidTy()) {
+ auto *MD =
+ ValueAsMetadata::get(ValueList.getValueFwdRef(Record[i + 1], Ty));
+ assert(isa<ConstantAsMetadata>(MD) &&
+ "Expected non-function-local metadata");
+ Elts.push_back(MD);
+ } else
+ Elts.push_back(nullptr);
+ }
+ MetadataList.assignValue(MDNode::get(Context, Elts), NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_VALUE: {
+ if (Record.size() != 2)
+ return error("Invalid record");
+
+ Type *Ty = getTypeByID(Record[0]);
+ if (Ty->isMetadataTy() || Ty->isVoidTy())
+ return error("Invalid record");
+
+ MetadataList.assignValue(
+ ValueAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_DISTINCT_NODE:
+ IsDistinct = true;
+ LLVM_FALLTHROUGH;
+ case bitc::METADATA_NODE: {
+ SmallVector<Metadata *, 8> Elts;
+ Elts.reserve(Record.size());
+ for (unsigned ID : Record)
+ Elts.push_back(getMDOrNull(ID));
+ MetadataList.assignValue(IsDistinct ? MDNode::getDistinct(Context, Elts)
+ : MDNode::get(Context, Elts),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_LOCATION: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ unsigned Line = Record[1];
+ unsigned Column = Record[2];
+ Metadata *Scope = getMD(Record[3]);
+ Metadata *InlinedAt = getMDOrNull(Record[4]);
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DILocation, (Context, Line, Column, Scope, InlinedAt)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_GENERIC_DEBUG: {
+ if (Record.size() < 4)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ unsigned Tag = Record[1];
+ unsigned Version = Record[2];
+
+ if (Tag >= 1u << 16 || Version != 0)
+ return error("Invalid record");
+
+ auto *Header = getMDString(Record[3]);
+ SmallVector<Metadata *, 8> DwarfOps;
+ for (unsigned I = 4, E = Record.size(); I != E; ++I)
+ DwarfOps.push_back(getMDOrNull(Record[I]));
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(GenericDINode, (Context, Tag, Header, DwarfOps)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_SUBRANGE: {
+ if (Record.size() != 3)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DISubrange,
+ (Context, Record[1], unrotateSign(Record[2]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_ENUMERATOR: {
+ if (Record.size() != 3)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIEnumerator, (Context, unrotateSign(Record[1]),
+ getMDString(Record[2]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_BASIC_TYPE: {
+ if (Record.size() != 6)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIBasicType,
+ (Context, Record[1], getMDString(Record[2]), Record[3],
+ Record[4], Record[5])),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_DERIVED_TYPE: {
+ if (Record.size() != 12)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[10]);
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIDerivedType,
+ (Context, Record[1], getMDString(Record[2]),
+ getMDOrNull(Record[3]), Record[4],
+ getDITypeRefOrNull(Record[5]),
+ getDITypeRefOrNull(Record[6]), Record[7], Record[8],
+ Record[9], Flags, getDITypeRefOrNull(Record[11]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_COMPOSITE_TYPE: {
+ if (Record.size() != 16)
+ return error("Invalid record");
+
+ // If we have a UUID and this is not a forward declaration, lookup the
+ // mapping.
+ IsDistinct = Record[0] & 0x1;
+ bool IsNotUsedInTypeRef = Record[0] >= 2;
+ unsigned Tag = Record[1];
+ MDString *Name = getMDString(Record[2]);
+ Metadata *File = getMDOrNull(Record[3]);
+ unsigned Line = Record[4];
+ Metadata *Scope = getDITypeRefOrNull(Record[5]);
+ Metadata *BaseType = nullptr;
+ uint64_t SizeInBits = Record[7];
+ if (Record[8] > (uint64_t)std::numeric_limits<uint32_t>::max())
+ return error("Alignment value is too large");
+ uint32_t AlignInBits = Record[8];
+ uint64_t OffsetInBits = 0;
+ DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[10]);
+ Metadata *Elements = nullptr;
+ unsigned RuntimeLang = Record[12];
+ Metadata *VTableHolder = nullptr;
+ Metadata *TemplateParams = nullptr;
+ auto *Identifier = getMDString(Record[15]);
+ // If this module is being parsed so that it can be ThinLTO imported
+ // into another module, composite types only need to be imported
+ // as type declarations (unless full type definitions requested).
+ // Create type declarations up front to save memory. Also, buildODRType
+ // handles the case where this is type ODRed with a definition needed
+ // by the importing module, in which case the existing definition is
+ // used.
+ if (IsImporting && !ImportFullTypeDefinitions && Identifier &&
+ (Tag == dwarf::DW_TAG_enumeration_type ||
+ Tag == dwarf::DW_TAG_class_type ||
+ Tag == dwarf::DW_TAG_structure_type ||
+ Tag == dwarf::DW_TAG_union_type)) {
+ Flags = Flags | DINode::FlagFwdDecl;
+ } else {
+ BaseType = getDITypeRefOrNull(Record[6]);
+ OffsetInBits = Record[9];
+ Elements = getMDOrNull(Record[11]);
+ VTableHolder = getDITypeRefOrNull(Record[13]);
+ TemplateParams = getMDOrNull(Record[14]);
+ }
+ DICompositeType *CT = nullptr;
+ if (Identifier)
+ CT = DICompositeType::buildODRType(
+ Context, *Identifier, Tag, Name, File, Line, Scope, BaseType,
+ SizeInBits, AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
+ VTableHolder, TemplateParams);
+
+ // Create a node if we didn't get a lazy ODR type.
+ if (!CT)
+ CT = GET_OR_DISTINCT(DICompositeType,
+ (Context, Tag, Name, File, Line, Scope, BaseType,
+ SizeInBits, AlignInBits, OffsetInBits, Flags,
+ Elements, RuntimeLang, VTableHolder, TemplateParams,
+ Identifier));
+ if (!IsNotUsedInTypeRef && Identifier)
+ MetadataList.addTypeRef(*Identifier, *cast<DICompositeType>(CT));
+
+ MetadataList.assignValue(CT, NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_SUBROUTINE_TYPE: {
+ if (Record.size() < 3 || Record.size() > 4)
+ return error("Invalid record");
+ bool IsOldTypeRefArray = Record[0] < 2;
+ unsigned CC = (Record.size() > 3) ? Record[3] : 0;
+
+ IsDistinct = Record[0] & 0x1;
+ DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[1]);
+ Metadata *Types = getMDOrNull(Record[2]);
+ if (LLVM_UNLIKELY(IsOldTypeRefArray))
+ Types = MetadataList.upgradeTypeRefArray(Types);
+
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DISubroutineType, (Context, Flags, CC, Types)),
+ NextMetadataNo++);
+ break;
+ }
+
+ case bitc::METADATA_MODULE: {
+ if (Record.size() != 6)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIModule,
+ (Context, getMDOrNull(Record[1]),
+ getMDString(Record[2]), getMDString(Record[3]),
+ getMDString(Record[4]), getMDString(Record[5]))),
+ NextMetadataNo++);
+ break;
+ }
+
+ case bitc::METADATA_FILE: {
+ if (Record.size() != 3 && Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(
+ DIFile,
+ (Context, getMDString(Record[1]), getMDString(Record[2]),
+ Record.size() == 3 ? DIFile::CSK_None
+ : static_cast<DIFile::ChecksumKind>(Record[3]),
+ Record.size() == 3 ? nullptr : getMDString(Record[4]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_COMPILE_UNIT: {
+ if (Record.size() < 14 || Record.size() > 17)
+ return error("Invalid record");
+
+ // Ignore Record[0], which indicates whether this compile unit is
+ // distinct. It's always distinct.
+ IsDistinct = true;
+ auto *CU = DICompileUnit::getDistinct(
+ Context, Record[1], getMDOrNull(Record[2]), getMDString(Record[3]),
+ Record[4], getMDString(Record[5]), Record[6], getMDString(Record[7]),
+ Record[8], getMDOrNull(Record[9]), getMDOrNull(Record[10]),
+ getMDOrNull(Record[12]), getMDOrNull(Record[13]),
+ Record.size() <= 15 ? nullptr : getMDOrNull(Record[15]),
+ Record.size() <= 14 ? 0 : Record[14],
+ Record.size() <= 16 ? true : Record[16]);
+
+ MetadataList.assignValue(CU, NextMetadataNo++);
+
+ // Move the Upgrade the list of subprograms.
+ if (Metadata *SPs = getMDOrNullWithoutPlaceholders(Record[11]))
+ CUSubprograms.push_back({CU, SPs});
+ break;
+ }
+ case bitc::METADATA_SUBPROGRAM: {
+ if (Record.size() < 18 || Record.size() > 20)
+ return error("Invalid record");
+
+ IsDistinct =
+ (Record[0] & 1) || Record[8]; // All definitions should be distinct.
+ // Version 1 has a Function as Record[15].
+ // Version 2 has removed Record[15].
+ // Version 3 has the Unit as Record[15].
+ // Version 4 added thisAdjustment.
+ bool HasUnit = Record[0] >= 2;
+ if (HasUnit && Record.size() < 19)
+ return error("Invalid record");
+ Metadata *CUorFn = getMDOrNull(Record[15]);
+ unsigned Offset = Record.size() >= 19 ? 1 : 0;
+ bool HasFn = Offset && !HasUnit;
+ bool HasThisAdj = Record.size() >= 20;
+ DISubprogram *SP = GET_OR_DISTINCT(
+ DISubprogram, (Context,
+ getDITypeRefOrNull(Record[1]), // scope
+ getMDString(Record[2]), // name
+ getMDString(Record[3]), // linkageName
+ getMDOrNull(Record[4]), // file
+ Record[5], // line
+ getMDOrNull(Record[6]), // type
+ Record[7], // isLocal
+ Record[8], // isDefinition
+ Record[9], // scopeLine
+ getDITypeRefOrNull(Record[10]), // containingType
+ Record[11], // virtuality
+ Record[12], // virtualIndex
+ HasThisAdj ? Record[19] : 0, // thisAdjustment
+ static_cast<DINode::DIFlags>(Record[13] // flags
+ ),
+ Record[14], // isOptimized
+ HasUnit ? CUorFn : nullptr, // unit
+ getMDOrNull(Record[15 + Offset]), // templateParams
+ getMDOrNull(Record[16 + Offset]), // declaration
+ getMDOrNull(Record[17 + Offset]) // variables
+ ));
+ MetadataList.assignValue(SP, NextMetadataNo++);
+
+ // Upgrade sp->function mapping to function->sp mapping.
+ if (HasFn) {
+ if (auto *CMD = dyn_cast_or_null<ConstantAsMetadata>(CUorFn))
+ if (auto *F = dyn_cast<Function>(CMD->getValue())) {
+ if (F->isMaterializable())
+ // Defer until materialized; unmaterialized functions may not have
+ // metadata.
+ FunctionsWithSPs[F] = SP;
+ else if (!F->empty())
+ F->setSubprogram(SP);
+ }
+ }
+ break;
+ }
+ case bitc::METADATA_LEXICAL_BLOCK: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DILexicalBlock,
+ (Context, getMDOrNull(Record[1]),
+ getMDOrNull(Record[2]), Record[3], Record[4])),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_LEXICAL_BLOCK_FILE: {
+ if (Record.size() != 4)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DILexicalBlockFile,
+ (Context, getMDOrNull(Record[1]),
+ getMDOrNull(Record[2]), Record[3])),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_NAMESPACE: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0] & 1;
+ bool ExportSymbols = Record[0] & 2;
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DINamespace,
+ (Context, getMDOrNull(Record[1]),
+ getMDOrNull(Record[2]), getMDString(Record[3]),
+ Record[4], ExportSymbols)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_MACRO: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIMacro,
+ (Context, Record[1], Record[2], getMDString(Record[3]),
+ getMDString(Record[4]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_MACRO_FILE: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIMacroFile,
+ (Context, Record[1], Record[2], getMDOrNull(Record[3]),
+ getMDOrNull(Record[4]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_TEMPLATE_TYPE: {
+ if (Record.size() != 3)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(GET_OR_DISTINCT(DITemplateTypeParameter,
+ (Context, getMDString(Record[1]),
+ getDITypeRefOrNull(Record[2]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_TEMPLATE_VALUE: {
+ if (Record.size() != 5)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DITemplateValueParameter,
+ (Context, Record[1], getMDString(Record[2]),
+ getDITypeRefOrNull(Record[3]),
+ getMDOrNull(Record[4]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_GLOBAL_VAR: {
+ if (Record.size() < 11 || Record.size() > 12)
+ return error("Invalid record");
+
+ IsDistinct = Record[0] & 1;
+ unsigned Version = Record[0] >> 1;
+
+ if (Version == 1) {
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIGlobalVariable,
+ (Context, getMDOrNull(Record[1]),
+ getMDString(Record[2]), getMDString(Record[3]),
+ getMDOrNull(Record[4]), Record[5],
+ getDITypeRefOrNull(Record[6]), Record[7], Record[8],
+ getMDOrNull(Record[10]), Record[11])),
+ NextMetadataNo++);
+ } else if (Version == 0) {
+ // Upgrade old metadata, which stored a global variable reference or a
+ // ConstantInt here.
+ Metadata *Expr = getMDOrNull(Record[9]);
+ uint32_t AlignInBits = 0;
+ if (Record.size() > 11) {
+ if (Record[11] > (uint64_t)std::numeric_limits<uint32_t>::max())
+ return error("Alignment value is too large");
+ AlignInBits = Record[11];
+ }
+ GlobalVariable *Attach = nullptr;
+ if (auto *CMD = dyn_cast_or_null<ConstantAsMetadata>(Expr)) {
+ if (auto *GV = dyn_cast<GlobalVariable>(CMD->getValue())) {
+ Attach = GV;
+ Expr = nullptr;
+ } else if (auto *CI = dyn_cast<ConstantInt>(CMD->getValue())) {
+ Expr = DIExpression::get(Context,
+ {dwarf::DW_OP_constu, CI->getZExtValue(),
+ dwarf::DW_OP_stack_value});
+ } else {
+ Expr = nullptr;
+ }
+ }
+ DIGlobalVariable *DGV = GET_OR_DISTINCT(
+ DIGlobalVariable,
+ (Context, getMDOrNull(Record[1]), getMDString(Record[2]),
+ getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
+ getDITypeRefOrNull(Record[6]), Record[7], Record[8],
+ getMDOrNull(Record[10]), AlignInBits));
+
+ auto *DGVE = DIGlobalVariableExpression::getDistinct(Context, DGV, Expr);
+ MetadataList.assignValue(DGVE, NextMetadataNo++);
+ if (Attach)
+ Attach->addDebugInfo(DGVE);
+ } else
+ return error("Invalid record");
+
+ break;
+ }
+ case bitc::METADATA_LOCAL_VAR: {
+ // 10th field is for the obseleted 'inlinedAt:' field.
+ if (Record.size() < 8 || Record.size() > 10)
+ return error("Invalid record");
+
+ IsDistinct = Record[0] & 1;
+ bool HasAlignment = Record[0] & 2;
+ // 2nd field used to be an artificial tag, either DW_TAG_auto_variable or
+ // DW_TAG_arg_variable, if we have alignment flag encoded it means, that
+ // this is newer version of record which doesn't have artifical tag.
+ bool HasTag = !HasAlignment && Record.size() > 8;
+ DINode::DIFlags Flags = static_cast<DINode::DIFlags>(Record[7 + HasTag]);
+ uint32_t AlignInBits = 0;
+ if (HasAlignment) {
+ if (Record[8 + HasTag] > (uint64_t)std::numeric_limits<uint32_t>::max())
+ return error("Alignment value is too large");
+ AlignInBits = Record[8 + HasTag];
+ }
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DILocalVariable,
+ (Context, getMDOrNull(Record[1 + HasTag]),
+ getMDString(Record[2 + HasTag]),
+ getMDOrNull(Record[3 + HasTag]), Record[4 + HasTag],
+ getDITypeRefOrNull(Record[5 + HasTag]),
+ Record[6 + HasTag], Flags, AlignInBits)),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_EXPRESSION: {
+ if (Record.size() < 1)
+ return error("Invalid record");
+
+ IsDistinct = Record[0] & 1;
+ bool HasOpFragment = Record[0] & 2;
+ auto Elts = MutableArrayRef<uint64_t>(Record).slice(1);
+ if (!HasOpFragment)
+ if (unsigned N = Elts.size())
+ if (N >= 3 && Elts[N - 3] == dwarf::DW_OP_bit_piece)
+ Elts[N - 3] = dwarf::DW_OP_LLVM_fragment;
+
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIExpression, (Context, makeArrayRef(Record).slice(1))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_GLOBAL_VAR_EXPR: {
+ if (Record.size() != 3)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(GET_OR_DISTINCT(DIGlobalVariableExpression,
+ (Context, getMDOrNull(Record[1]),
+ getMDOrNull(Record[2]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_OBJC_PROPERTY: {
+ if (Record.size() != 8)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIObjCProperty,
+ (Context, getMDString(Record[1]),
+ getMDOrNull(Record[2]), Record[3],
+ getMDString(Record[4]), getMDString(Record[5]),
+ Record[6], getDITypeRefOrNull(Record[7]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_IMPORTED_ENTITY: {
+ if (Record.size() != 6)
+ return error("Invalid record");
+
+ IsDistinct = Record[0];
+ MetadataList.assignValue(
+ GET_OR_DISTINCT(DIImportedEntity,
+ (Context, Record[1], getMDOrNull(Record[2]),
+ getDITypeRefOrNull(Record[3]), Record[4],
+ getMDString(Record[5]))),
+ NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_STRING_OLD: {
+ std::string String(Record.begin(), Record.end());
+
+ // Test for upgrading !llvm.loop.
+ HasSeenOldLoopTags |= mayBeOldLoopAttachmentTag(String);
+
+ Metadata *MD = MDString::get(Context, String);
+ MetadataList.assignValue(MD, NextMetadataNo++);
+ break;
+ }
+ case bitc::METADATA_STRINGS:
+ if (Error Err = parseMetadataStrings(Record, Blob, NextMetadataNo))
+ return Err;
+ break;
+ case bitc::METADATA_GLOBAL_DECL_ATTACHMENT: {
+ if (Record.size() % 2 == 0)
+ return error("Invalid record");
+ unsigned ValueID = Record[0];
+ if (ValueID >= ValueList.size())
+ return error("Invalid record");
+ if (auto *GO = dyn_cast<GlobalObject>(ValueList[ValueID]))
+ if (Error Err = parseGlobalObjectAttachment(
+ *GO, ArrayRef<uint64_t>(Record).slice(1)))
+ return Err;
+ break;
+ }
+ case bitc::METADATA_KIND: {
+ // Support older bitcode files that had METADATA_KIND records in a
+ // block with METADATA_BLOCK_ID.
+ if (Error Err = parseMetadataKindRecord(Record))
+ return Err;
+ break;
+ }
+ }
+#undef GET_OR_DISTINCT
+ return Error::success();
+}
+
+Error MetadataLoader::MetadataLoaderImpl::parseMetadataStrings(
+ ArrayRef<uint64_t> Record, StringRef Blob, unsigned &NextMetadataNo) {
+ // All the MDStrings in the block are emitted together in a single
+ // record. The strings are concatenated and stored in a blob along with
+ // their sizes.
+ if (Record.size() != 2)
+ return error("Invalid record: metadata strings layout");
+
+ unsigned NumStrings = Record[0];
+ unsigned StringsOffset = Record[1];
+ if (!NumStrings)
+ return error("Invalid record: metadata strings with no strings");
+ if (StringsOffset > Blob.size())
+ return error("Invalid record: metadata strings corrupt offset");
+
+ StringRef Lengths = Blob.slice(0, StringsOffset);
+ SimpleBitstreamCursor R(Lengths);
+
+ StringRef Strings = Blob.drop_front(StringsOffset);
+ do {
+ if (R.AtEndOfStream())
+ return error("Invalid record: metadata strings bad length");
+
+ unsigned Size = R.ReadVBR(6);
+ if (Strings.size() < Size)
+ return error("Invalid record: metadata strings truncated chars");
+
+ MetadataList.assignValue(MDString::get(Context, Strings.slice(0, Size)),
+ NextMetadataNo++);
+ Strings = Strings.drop_front(Size);
+ } while (--NumStrings);
+
+ return Error::success();
+}
+
+Error MetadataLoader::MetadataLoaderImpl::parseGlobalObjectAttachment(
+ GlobalObject &GO, ArrayRef<uint64_t> Record) {
+ assert(Record.size() % 2 == 0);
+ for (unsigned I = 0, E = Record.size(); I != E; I += 2) {
+ auto K = MDKindMap.find(Record[I]);
+ if (K == MDKindMap.end())
+ return error("Invalid ID");
+ MDNode *MD = MetadataList.getMDNodeFwdRefOrNull(Record[I + 1]);
+ if (!MD)
+ return error("Invalid metadata attachment");
+ GO.addMetadata(K->second, *MD);
+ }
+ return Error::success();
+}
+
+/// Parse metadata attachments.
+Error MetadataLoader::MetadataLoaderImpl::parseMetadataAttachment(
+ Function &F, const SmallVectorImpl<Instruction *> &InstructionList) {
+ if (Stream.EnterSubBlock(bitc::METADATA_ATTACHMENT_ID))
+ return error("Invalid record");
+
+ SmallVector<uint64_t, 64> Record;
+
+ while (true) {
+ BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
+
+ switch (Entry.Kind) {
+ case BitstreamEntry::SubBlock: // Handled for us already.
+ case BitstreamEntry::Error:
+ return error("Malformed block");
+ case BitstreamEntry::EndBlock:
+ return Error::success();
+ case BitstreamEntry::Record:
+ // The interesting case.
+ break;
+ }
+
+ // Read a metadata attachment record.
+ Record.clear();
+ switch (Stream.readRecord(Entry.ID, Record)) {
+ default: // Default behavior: ignore.
+ break;
+ case bitc::METADATA_ATTACHMENT: {
+ unsigned RecordLength = Record.size();
+ if (Record.empty())
+ return error("Invalid record");
+ if (RecordLength % 2 == 0) {
+ // A function attachment.
+ if (Error Err = parseGlobalObjectAttachment(F, Record))
+ return Err;
+ continue;
+ }
+
+ // An instruction attachment.
+ Instruction *Inst = InstructionList[Record[0]];
+ for (unsigned i = 1; i != RecordLength; i = i + 2) {
+ unsigned Kind = Record[i];
+ DenseMap<unsigned, unsigned>::iterator I = MDKindMap.find(Kind);
+ if (I == MDKindMap.end())
+ return error("Invalid ID");
+ if (I->second == LLVMContext::MD_tbaa && StripTBAA)
+ continue;
+
+ Metadata *Node = MetadataList.getMetadataFwdRef(Record[i + 1]);
+ if (isa<LocalAsMetadata>(Node))
+ // Drop the attachment. This used to be legal, but there's no
+ // upgrade path.
+ break;
+ MDNode *MD = dyn_cast_or_null<MDNode>(Node);
+ if (!MD)
+ return error("Invalid metadata attachment");
+
+ if (HasSeenOldLoopTags && I->second == LLVMContext::MD_loop)
+ MD = upgradeInstructionLoopAttachment(*MD);
+
+ if (I->second == LLVMContext::MD_tbaa) {
+ assert(!MD->isTemporary() && "should load MDs before attachments");
+ MD = UpgradeTBAANode(*MD);
+ }
+ Inst->setMetadata(I->second, MD);
+ }
+ break;
+ }
+ }
+ }
+}
+
+/// Parse a single METADATA_KIND record, inserting result in MDKindMap.
+Error MetadataLoader::MetadataLoaderImpl::parseMetadataKindRecord(
+ SmallVectorImpl<uint64_t> &Record) {
+ if (Record.size() < 2)
+ return error("Invalid record");
+
+ unsigned Kind = Record[0];
+ SmallString<8> Name(Record.begin() + 1, Record.end());
+
+ unsigned NewKind = TheModule.getMDKindID(Name.str());
+ if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second)
+ return error("Conflicting METADATA_KIND records");
+ return Error::success();
+}
+
+/// Parse the metadata kinds out of the METADATA_KIND_BLOCK.
+Error MetadataLoader::MetadataLoaderImpl::parseMetadataKinds() {
+ if (Stream.EnterSubBlock(bitc::METADATA_KIND_BLOCK_ID))
+ return error("Invalid record");
+
+ SmallVector<uint64_t, 64> Record;
+
+ // Read all the records.
+ while (true) {
+ BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
+
+ switch (Entry.Kind) {
+ case BitstreamEntry::SubBlock: // Handled for us already.
+ case BitstreamEntry::Error:
+ return error("Malformed block");
+ case BitstreamEntry::EndBlock:
+ return Error::success();
+ case BitstreamEntry::Record:
+ // The interesting case.
+ break;
+ }
+
+ // Read a record.
+ Record.clear();
+ unsigned Code = Stream.readRecord(Entry.ID, Record);
+ switch (Code) {
+ default: // Default behavior: ignore.
+ break;
+ case bitc::METADATA_KIND: {
+ if (Error Err = parseMetadataKindRecord(Record))
+ return Err;
+ break;
+ }
+ }
+ }
+}
+
+MetadataLoader &MetadataLoader::operator=(MetadataLoader &&RHS) {
+ Pimpl = std::move(RHS.Pimpl);
+ return *this;
+}
+MetadataLoader::MetadataLoader(MetadataLoader &&RHS)
+ : Pimpl(std::move(RHS.Pimpl)) {}
+
+MetadataLoader::~MetadataLoader() = default;
+MetadataLoader::MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
+ BitcodeReaderValueList &ValueList,
+ bool IsImporting,
+ std::function<Type *(unsigned)> getTypeByID)
+ : Pimpl(llvm::make_unique<MetadataLoaderImpl>(Stream, TheModule, ValueList,
+ getTypeByID, IsImporting)) {}
+
+Error MetadataLoader::parseMetadata(bool ModuleLevel) {
+ return Pimpl->parseMetadata(ModuleLevel);
+}
+
+bool MetadataLoader::hasFwdRefs() const { return Pimpl->hasFwdRefs(); }
+
+/// Return the given metadata, creating a replaceable forward reference if
+/// necessary.
+Metadata *MetadataLoader::getMetadataFwdRef(unsigned Idx) {
+ return Pimpl->getMetadataFwdRef(Idx);
+}
+
+MDNode *MetadataLoader::getMDNodeFwdRefOrNull(unsigned Idx) {
+ return Pimpl->getMDNodeFwdRefOrNull(Idx);
+}
+
+DISubprogram *MetadataLoader::lookupSubprogramForFunction(Function *F) {
+ return Pimpl->lookupSubprogramForFunction(F);
+}
+
+Error MetadataLoader::parseMetadataAttachment(
+ Function &F, const SmallVectorImpl<Instruction *> &InstructionList) {
+ return Pimpl->parseMetadataAttachment(F, InstructionList);
+}
+
+Error MetadataLoader::parseMetadataKinds() {
+ return Pimpl->parseMetadataKinds();
+}
+
+void MetadataLoader::setStripTBAA(bool StripTBAA) {
+ return Pimpl->setStripTBAA(StripTBAA);
+}
+
+bool MetadataLoader::isStrippingTBAA() { return Pimpl->isStrippingTBAA(); }
+
+unsigned MetadataLoader::size() const { return Pimpl->size(); }
+void MetadataLoader::shrinkTo(unsigned N) { return Pimpl->shrinkTo(N); }
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 10:53:37 +0000