Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- DWARFUnit.h ----------------------------------------------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_DEBUGINFO_DWARF_DWARFUNIT_H

#define LLVM_DEBUGINFO_DWARF_DWARFUNIT_H

#include "llvm/ADT/DenseSet.h"

#include "llvm/ADT/STLExtras.h"

#include "llvm/ADT/SmallVector.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/ADT/iterator_range.h"

#include "llvm/BinaryFormat/Dwarf.h"

#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"

#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"

#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"

#include "llvm/DebugInfo/DWARF/DWARFDie.h"

#include "llvm/DebugInfo/DWARF/DWARFLocationExpression.h"

#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"

#include "llvm/Support/DataExtractor.h"

#include <cassert>

#include <cstddef>

#include <cstdint>

#include <map>

#include <memory>

#include <set>

#include <utility>

#include <vector>

namespace llvm {

class DWARFAbbreviationDeclarationSet;

class DWARFContext;

class DWARFDebugAbbrev;

class DWARFUnit;

class DWARFDebugRangeList;

class DWARFLocationTable;

class DWARFObject;

class raw_ostream;

struct DIDumpOptions;

struct DWARFSection;

/// Base class describing the header of any kind of "unit."  Some information

/// is specific to certain unit types.  We separate this class out so we can

/// parse the header before deciding what specific kind of unit to construct.

class DWARFUnitHeader {

  // Offset within section.

  uint64_t Offset = 0;

  // Version, address size, and DWARF format.

  dwarf::FormParams FormParams;

  uint64_t Length = 0;

  uint64_t AbbrOffset = 0;

  // For DWO units only.

  const DWARFUnitIndex::Entry *IndexEntry = nullptr;

  // For type units only.

  uint64_t TypeHash = 0;

  uint64_t TypeOffset = 0;

  // For v5 split or skeleton compile units only.

  std::optional<uint64_t> DWOId;

  // Unit type as parsed, or derived from the section kind.

  uint8_t UnitType = 0;

  // Size as parsed. uint8_t for compactness.

  uint8_t Size = 0;

public:

  /// Parse a unit header from \p debug_info starting at \p offset_ptr.

  /// Note that \p SectionKind is used as a hint to guess the unit type

  /// for DWARF formats prior to DWARFv5. In DWARFv5 the unit type is

  /// explicitly defined in the header and the hint is ignored.

  bool extract(DWARFContext &Context, const DWARFDataExtractor &debug_info,

               uint64_t *offset_ptr, DWARFSectionKind SectionKind);

  // For units in DWARF Package File, remember the index entry and update

  // the abbreviation offset read by extract().

  bool applyIndexEntry(const DWARFUnitIndex::Entry *Entry);

  uint64_t getOffset() const { return Offset; }

  const dwarf::FormParams &getFormParams() const { return FormParams; }

  uint16_t getVersion() const { return FormParams.Version; }

  dwarf::DwarfFormat getFormat() const { return FormParams.Format; }

  uint8_t getAddressByteSize() const { return FormParams.AddrSize; }

  uint8_t getRefAddrByteSize() const { return FormParams.getRefAddrByteSize(); }

  uint8_t getDwarfOffsetByteSize() const {

    return FormParams.getDwarfOffsetByteSize();

  }

  uint64_t getLength() const { return Length; }

  uint64_t getAbbrOffset() const { return AbbrOffset; }

  std::optional<uint64_t> getDWOId() const { return DWOId; }

  void setDWOId(uint64_t Id) {

    assert((!DWOId || *DWOId == Id) && "setting DWOId to a different value");

    DWOId = Id;

  }

  const DWARFUnitIndex::Entry *getIndexEntry() const { return IndexEntry; }

  uint64_t getTypeHash() const { return TypeHash; }

  uint64_t getTypeOffset() const { return TypeOffset; }

  uint8_t getUnitType() const { return UnitType; }

  bool isTypeUnit() const {

    return UnitType == dwarf::DW_UT_type || UnitType == dwarf::DW_UT_split_type;

  }

  uint8_t getSize() const { return Size; }

  uint8_t getUnitLengthFieldByteSize() const {

    return dwarf::getUnitLengthFieldByteSize(FormParams.Format);

  }

  uint64_t getNextUnitOffset() const {

    return Offset + Length + getUnitLengthFieldByteSize();

  }

};

const DWARFUnitIndex &getDWARFUnitIndex(DWARFContext &Context,

                                        DWARFSectionKind Kind);

bool isCompileUnit(const std::unique_ptr<DWARFUnit> &U);

/// Describe a collection of units. Intended to hold all units either from

/// .debug_info and .debug_types, or from .debug_info.dwo and .debug_types.dwo.

class DWARFUnitVector final : public SmallVector<std::unique_ptr<DWARFUnit>, 1> {

  std::function<std::unique_ptr<DWARFUnit>(uint64_t, DWARFSectionKind,

                                           const DWARFSection *,

                                           const DWARFUnitIndex::Entry *)>

      Parser;

  int NumInfoUnits = -1;

public:

  using UnitVector = SmallVectorImpl<std::unique_ptr<DWARFUnit>>;

  using iterator = typename UnitVector::iterator;

  using iterator_range = llvm::iterator_range<typename UnitVector::iterator>;

  using compile_unit_range =

      decltype(make_filter_range(std::declval<iterator_range>(), isCompileUnit));

  DWARFUnit *getUnitForOffset(uint64_t Offset) const;

  DWARFUnit *getUnitForIndexEntry(const DWARFUnitIndex::Entry &E);

  /// Read units from a .debug_info or .debug_types section.  Calls made

  /// before finishedInfoUnits() are assumed to be for .debug_info sections,

  /// calls after finishedInfoUnits() are for .debug_types sections.  Caller

  /// must not mix calls to addUnitsForSection and addUnitsForDWOSection.

  void addUnitsForSection(DWARFContext &C, const DWARFSection &Section,

                          DWARFSectionKind SectionKind);

  /// Read units from a .debug_info.dwo or .debug_types.dwo section.  Calls

  /// made before finishedInfoUnits() are assumed to be for .debug_info.dwo

  /// sections, calls after finishedInfoUnits() are for .debug_types.dwo

  /// sections.  Caller must not mix calls to addUnitsForSection and

  /// addUnitsForDWOSection.

  void addUnitsForDWOSection(DWARFContext &C, const DWARFSection &DWOSection,

                             DWARFSectionKind SectionKind, bool Lazy = false);

  /// Add an existing DWARFUnit to this UnitVector. This is used by the DWARF

  /// verifier to process unit separately.

  DWARFUnit *addUnit(std::unique_ptr<DWARFUnit> Unit);

  /// Returns number of all units held by this instance.

  unsigned getNumUnits() const { return size(); }

  /// Returns number of units from all .debug_info[.dwo] sections.

  unsigned getNumInfoUnits() const {

    return NumInfoUnits == -1 ? size() : NumInfoUnits;

  }

  /// Returns number of units from all .debug_types[.dwo] sections.

  unsigned getNumTypesUnits() const { return size() - NumInfoUnits; }

  /// Indicate that parsing .debug_info[.dwo] is done, and remaining units

  /// will be from .debug_types[.dwo].

  void finishedInfoUnits() { NumInfoUnits = size(); }

private:

  void addUnitsImpl(DWARFContext &Context, const DWARFObject &Obj,

                    const DWARFSection &Section, const DWARFDebugAbbrev *DA,

                    const DWARFSection *RS, const DWARFSection *LocSection,

                    StringRef SS, const DWARFSection &SOS,

                    const DWARFSection *AOS, const DWARFSection &LS, bool LE,

                    bool IsDWO, bool Lazy, DWARFSectionKind SectionKind);

};

/// Represents base address of the CU.

/// Represents a unit's contribution to the string offsets table.

struct StrOffsetsContributionDescriptor {

  uint64_t Base = 0;

  /// The contribution size not including the header.

  uint64_t Size = 0;

  /// Format and version.

  dwarf::FormParams FormParams = {0, 0, dwarf::DwarfFormat::DWARF32};

  StrOffsetsContributionDescriptor(uint64_t Base, uint64_t Size,

                                   uint8_t Version, dwarf::DwarfFormat Format)

      : Base(Base), Size(Size), FormParams({Version, 0, Format}) {}

  StrOffsetsContributionDescriptor() = default;

  uint8_t getVersion() const { return FormParams.Version; }

  dwarf::DwarfFormat getFormat() const { return FormParams.Format; }

  uint8_t getDwarfOffsetByteSize() const {

    return FormParams.getDwarfOffsetByteSize();

  }

  /// Determine whether a contribution to the string offsets table is

  /// consistent with the relevant section size and that its length is

  /// a multiple of the size of one of its entries.

  Expected<StrOffsetsContributionDescriptor>

  validateContributionSize(DWARFDataExtractor &DA);

};

class DWARFUnit {

  DWARFContext &Context;

  /// Section containing this DWARFUnit.

  const DWARFSection &InfoSection;

  DWARFUnitHeader Header;

  const DWARFDebugAbbrev *Abbrev;

  const DWARFSection *RangeSection;

  uint64_t RangeSectionBase;

  uint64_t LocSectionBase;

  /// Location table of this unit.

  std::unique_ptr<DWARFLocationTable> LocTable;

  const DWARFSection &LineSection;

  StringRef StringSection;

  const DWARFSection &StringOffsetSection;

  const DWARFSection *AddrOffsetSection;

  DWARFUnit *SU;

  std::optional<uint64_t> AddrOffsetSectionBase;

  bool IsLittleEndian;

  bool IsDWO;

  const DWARFUnitVector &UnitVector;

  /// Start, length, and DWARF format of the unit's contribution to the string

  /// offsets table (DWARF v5).

  std::optional<StrOffsetsContributionDescriptor>

      StringOffsetsTableContribution;

  mutable const DWARFAbbreviationDeclarationSet *Abbrevs;

  std::optional<object::SectionedAddress> BaseAddr;

  /// The compile unit debug information entry items.

  std::vector<DWARFDebugInfoEntry> DieArray;

  /// Map from range's start address to end address and corresponding DIE.

  /// IntervalMap does not support range removal, as a result, we use the

  /// std::map::upper_bound for address range lookup.

  std::map<uint64_t, std::pair<uint64_t, DWARFDie>> AddrDieMap;

  /// Map from the location (interpreted DW_AT_location) of a DW_TAG_variable,

  /// to the end address and the corresponding DIE.

  std::map<uint64_t, std::pair<uint64_t, DWARFDie>> VariableDieMap;

  DenseSet<uint64_t> RootsParsedForVariables;

  using die_iterator_range =

      iterator_range<std::vector<DWARFDebugInfoEntry>::iterator>;

  std::shared_ptr<DWARFUnit> DWO;

protected:

  /// Return the index of a \p Die entry inside the unit's DIE vector.

  ///

  /// It is illegal to call this method with a DIE that hasn't be

  /// created by this unit. In other word, it's illegal to call this

  /// method on a DIE that isn't accessible by following

  /// children/sibling links starting from this unit's getUnitDIE().

  uint32_t getDIEIndex(const DWARFDebugInfoEntry *Die) const {

    auto First = DieArray.data();

    assert(Die >= First && Die < First + DieArray.size());

    return Die - First;

  }

  /// Return DWARFDebugInfoEntry for the specified index \p Index.

  const DWARFDebugInfoEntry *getDebugInfoEntry(unsigned Index) const {

    assert(Index < DieArray.size());

    return &DieArray[Index];

  }

  const DWARFDebugInfoEntry *

  getParentEntry(const DWARFDebugInfoEntry *Die) const;

  const DWARFDebugInfoEntry *

  getSiblingEntry(const DWARFDebugInfoEntry *Die) const;

  const DWARFDebugInfoEntry *

  getPreviousSiblingEntry(const DWARFDebugInfoEntry *Die) const;

  const DWARFDebugInfoEntry *

  getFirstChildEntry(const DWARFDebugInfoEntry *Die) const;

  const DWARFDebugInfoEntry *

  getLastChildEntry(const DWARFDebugInfoEntry *Die) const;

  const DWARFUnitHeader &getHeader() const { return Header; }

  /// Find the unit's contribution to the string offsets table and determine its

  /// length and form. The given offset is expected to be derived from the unit

  /// DIE's DW_AT_str_offsets_base attribute.

  Expected<std::optional<StrOffsetsContributionDescriptor>>

  determineStringOffsetsTableContribution(DWARFDataExtractor &DA);

  /// Find the unit's contribution to the string offsets table and determine its

  /// length and form. The given offset is expected to be 0 in a dwo file or,

  /// in a dwp file, the start of the unit's contribution to the string offsets

  /// table section (as determined by the index table).

  Expected<std::optional<StrOffsetsContributionDescriptor>>

  determineStringOffsetsTableContributionDWO(DWARFDataExtractor &DA);

public:

  DWARFUnit(DWARFContext &Context, const DWARFSection &Section,

            const DWARFUnitHeader &Header, const DWARFDebugAbbrev *DA,

            const DWARFSection *RS, const DWARFSection *LocSection,

            StringRef SS, const DWARFSection &SOS, const DWARFSection *AOS,

            const DWARFSection &LS, bool LE, bool IsDWO,

            const DWARFUnitVector &UnitVector);

  virtual ~DWARFUnit();

  bool isLittleEndian() const { return IsLittleEndian; }

  bool isDWOUnit() const { return IsDWO; }

  DWARFContext& getContext() const { return Context; }

  const DWARFSection &getInfoSection() const { return InfoSection; }

  uint64_t getOffset() const { return Header.getOffset(); }

  const dwarf::FormParams &getFormParams() const {

    return Header.getFormParams();

  }

  uint16_t getVersion() const { return Header.getVersion(); }

  uint8_t getAddressByteSize() const { return Header.getAddressByteSize(); }

  uint8_t getRefAddrByteSize() const { return Header.getRefAddrByteSize(); }

  uint8_t getDwarfOffsetByteSize() const {

    return Header.getDwarfOffsetByteSize();

  }

  /// Size in bytes of the parsed unit header.

  uint32_t getHeaderSize() const { return Header.getSize(); }

  uint64_t getLength() const { return Header.getLength(); }

  dwarf::DwarfFormat getFormat() const { return Header.getFormat(); }

  uint8_t getUnitType() const { return Header.getUnitType(); }

  bool isTypeUnit() const { return Header.isTypeUnit(); }

  uint64_t getAbbrOffset() const { return Header.getAbbrOffset(); }

  uint64_t getNextUnitOffset() const { return Header.getNextUnitOffset(); }

  const DWARFSection &getLineSection() const { return LineSection; }

  StringRef getStringSection() const { return StringSection; }

  const DWARFSection &getStringOffsetSection() const {

    return StringOffsetSection;

  }

  void setSkeletonUnit(DWARFUnit *SU) { this->SU = SU; }

  // Returns itself if not using Split DWARF, or if the unit is a skeleton unit

  // - otherwise returns the split full unit's corresponding skeleton, if

  // available.

  DWARFUnit *getLinkedUnit() { return IsDWO ? SU : this; }

  void setAddrOffsetSection(const DWARFSection *AOS, uint64_t Base) {

    AddrOffsetSection = AOS;

    AddrOffsetSectionBase = Base;

  }

  std::optional<uint64_t> getAddrOffsetSectionBase() const {

    return AddrOffsetSectionBase;

  }

  /// Recursively update address to Die map.

  void updateAddressDieMap(DWARFDie Die);

  /// Recursively update address to variable Die map.

  void updateVariableDieMap(DWARFDie Die);

  void setRangesSection(const DWARFSection *RS, uint64_t Base) {

    RangeSection = RS;

    RangeSectionBase = Base;

  }

  uint64_t getLocSectionBase() const {

    return LocSectionBase;

  }

  std::optional<object::SectionedAddress>

  getAddrOffsetSectionItem(uint32_t Index) const;

  Expected<uint64_t> getStringOffsetSectionItem(uint32_t Index) const;

  DWARFDataExtractor getDebugInfoExtractor() const;

  DataExtractor getStringExtractor() const {

    return DataExtractor(StringSection, false, 0);

  }

  const DWARFLocationTable &getLocationTable() { return *LocTable; }

  /// Extract the range list referenced by this compile unit from the

  /// .debug_ranges section. If the extraction is unsuccessful, an error

  /// is returned. Successful extraction requires that the compile unit

  /// has already been extracted.

  Error extractRangeList(uint64_t RangeListOffset,

                         DWARFDebugRangeList &RangeList) const;

  void clear();

  const std::optional<StrOffsetsContributionDescriptor> &

  getStringOffsetsTableContribution() const {

    return StringOffsetsTableContribution;

  }

  uint8_t getDwarfStringOffsetsByteSize() const {

    assert(StringOffsetsTableContribution);

    return StringOffsetsTableContribution->getDwarfOffsetByteSize();

  }

  uint64_t getStringOffsetsBase() const {

    assert(StringOffsetsTableContribution);

    return StringOffsetsTableContribution->Base;

  }

  uint64_t getAbbreviationsOffset() const { return Header.getAbbrOffset(); }

  const DWARFAbbreviationDeclarationSet *getAbbreviations() const;

  static bool isMatchingUnitTypeAndTag(uint8_t UnitType, dwarf::Tag Tag) {

    switch (UnitType) {

    case dwarf::DW_UT_compile:

      return Tag == dwarf::DW_TAG_compile_unit;

    case dwarf::DW_UT_type:

      return Tag == dwarf::DW_TAG_type_unit;

    case dwarf::DW_UT_partial:

      return Tag == dwarf::DW_TAG_partial_unit;

    case dwarf::DW_UT_skeleton:

      return Tag == dwarf::DW_TAG_skeleton_unit;

    case dwarf::DW_UT_split_compile:

    case dwarf::DW_UT_split_type:

      return dwarf::isUnitType(Tag);

    }

    return false;

  }

  std::optional<object::SectionedAddress> getBaseAddress();

  DWARFDie getUnitDIE(bool ExtractUnitDIEOnly = true) {

    extractDIEsIfNeeded(ExtractUnitDIEOnly);

    if (DieArray.empty())

      return DWARFDie();

    return DWARFDie(this, &DieArray[0]);

  }

  DWARFDie getNonSkeletonUnitDIE(bool ExtractUnitDIEOnly = true,

                                 StringRef DWOAlternativeLocation = {}) {

    parseDWO(DWOAlternativeLocation);

    return DWO ? DWO->getUnitDIE(ExtractUnitDIEOnly)

               : getUnitDIE(ExtractUnitDIEOnly);

  }

  const char *getCompilationDir();

  std::optional<uint64_t> getDWOId() {

    extractDIEsIfNeeded(/*CUDieOnly*/ true);

    return getHeader().getDWOId();

  }

  void setDWOId(uint64_t NewID) { Header.setDWOId(NewID); }

  /// Return a vector of address ranges resulting from a (possibly encoded)

  /// range list starting at a given offset in the appropriate ranges section.

  Expected<DWARFAddressRangesVector> findRnglistFromOffset(uint64_t Offset);

  /// Return a vector of address ranges retrieved from an encoded range

  /// list whose offset is found via a table lookup given an index (DWARF v5

  /// and later).

  Expected<DWARFAddressRangesVector> findRnglistFromIndex(uint32_t Index);

  /// Return a rangelist's offset based on an index. The index designates

  /// an entry in the rangelist table's offset array and is supplied by

  /// DW_FORM_rnglistx.

  std::optional<uint64_t> getRnglistOffset(uint32_t Index);

  std::optional<uint64_t> getLoclistOffset(uint32_t Index);

  Expected<DWARFAddressRangesVector> collectAddressRanges();

  Expected<DWARFLocationExpressionsVector>

  findLoclistFromOffset(uint64_t Offset);

  /// Returns subprogram DIE with address range encompassing the provided

  /// address. The pointer is alive as long as parsed compile unit DIEs are not

  /// cleared.

  DWARFDie getSubroutineForAddress(uint64_t Address);

  /// Returns variable DIE for the address provided. The pointer is alive as

  /// long as parsed compile unit DIEs are not cleared.

  DWARFDie getVariableForAddress(uint64_t Address);

  /// getInlinedChainForAddress - fetches inlined chain for a given address.

  /// Returns empty chain if there is no subprogram containing address. The

  /// chain is valid as long as parsed compile unit DIEs are not cleared.

  void getInlinedChainForAddress(uint64_t Address,

                                 SmallVectorImpl<DWARFDie> &InlinedChain);

  /// Return the DWARFUnitVector containing this unit.

  const DWARFUnitVector &getUnitVector() const { return UnitVector; }

  /// Returns the number of DIEs in the unit. Parses the unit

  /// if necessary.

  unsigned getNumDIEs() {

    extractDIEsIfNeeded(false);

    return DieArray.size();

  }

  /// Return the index of a DIE inside the unit's DIE vector.

  ///

  /// It is illegal to call this method with a DIE that hasn't be

  /// created by this unit. In other word, it's illegal to call this

  /// method on a DIE that isn't accessible by following

  /// children/sibling links starting from this unit's getUnitDIE().

  uint32_t getDIEIndex(const DWARFDie &D) const {

    return getDIEIndex(D.getDebugInfoEntry());

  }

  /// Return the DIE object at the given index \p Index.

  DWARFDie getDIEAtIndex(unsigned Index) {

    return DWARFDie(this, getDebugInfoEntry(Index));

  }

  DWARFDie getParent(const DWARFDebugInfoEntry *Die);

  DWARFDie getSibling(const DWARFDebugInfoEntry *Die);

  DWARFDie getPreviousSibling(const DWARFDebugInfoEntry *Die);

  DWARFDie getFirstChild(const DWARFDebugInfoEntry *Die);

  DWARFDie getLastChild(const DWARFDebugInfoEntry *Die);

  /// Return the DIE object for a given offset \p Offset inside the

  /// unit's DIE vector.

  DWARFDie getDIEForOffset(uint64_t Offset) {

    if (std::optional<uint32_t> DieIdx = getDIEIndexForOffset(Offset))

      return DWARFDie(this, &DieArray[*DieIdx]);

    return DWARFDie();

  }

  /// Return the DIE index for a given offset \p Offset inside the

  /// unit's DIE vector.

  std::optional<uint32_t> getDIEIndexForOffset(uint64_t Offset) {

    extractDIEsIfNeeded(false);

    auto It =

        llvm::partition_point(DieArray, [=](const DWARFDebugInfoEntry &DIE) {

          return DIE.getOffset() < Offset;

        });

    if (It != DieArray.end() && It->getOffset() == Offset)

      return It - DieArray.begin();

    return std::nullopt;

  }

  uint32_t getLineTableOffset() const {

    if (auto IndexEntry = Header.getIndexEntry())

      if (const auto *Contrib = IndexEntry->getContribution(DW_SECT_LINE))

        return Contrib->getOffset32();

    return 0;

  }

  die_iterator_range dies() {

    extractDIEsIfNeeded(false);

    return die_iterator_range(DieArray.begin(), DieArray.end());

  }

  virtual void dump(raw_ostream &OS, DIDumpOptions DumpOpts) = 0;

  Error tryExtractDIEsIfNeeded(bool CUDieOnly);

private:

  /// Size in bytes of the .debug_info data associated with this compile unit.

  size_t getDebugInfoSize() const {

    return Header.getLength() + Header.getUnitLengthFieldByteSize() -

           getHeaderSize();

  }

  /// extractDIEsIfNeeded - Parses a compile unit and indexes its DIEs if it

  /// hasn't already been done

  void extractDIEsIfNeeded(bool CUDieOnly);

  /// extractDIEsToVector - Appends all parsed DIEs to a vector.

  void extractDIEsToVector(bool AppendCUDie, bool AppendNonCUDIEs,

                           std::vector<DWARFDebugInfoEntry> &DIEs) const;

  /// clearDIEs - Clear parsed DIEs to keep memory usage low.

  void clearDIEs(bool KeepCUDie);

  /// parseDWO - Parses .dwo file for current compile unit. Returns true if

  /// it was actually constructed.

  /// The \p AlternativeLocation specifies an alternative location to get

  /// the DWARF context for the DWO object; this is the case when it has

  /// been moved from its original location.

  bool parseDWO(StringRef AlternativeLocation = {});

};

inline bool isCompileUnit(const std::unique_ptr<DWARFUnit> &U) {

  return !U->isTypeUnit();

}

} // end namespace llvm

#endif // LLVM_DEBUGINFO_DWARF_DWARFUNIT_H