DIBuilder.h

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//===- DIBuilder.h - Debug Information Builder ------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file defines a DIBuilder that is useful for creating debugging
// information entries in LLVM IR form.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_IR_DIBUILDER_H
#define LLVM_IR_DIBUILDER_H
 
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/TrackingMDRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include <algorithm>
#include <cstdint>
#include <optional>
 
namespace llvm {
 
  class BasicBlock;
  class Constant;
  class Function;
  class Instruction;
  class LLVMContext;
  class Module;
  class Value;
  class DbgAssignIntrinsic;
  class DbgRecord;
 
  using DbgInstPtr = PointerUnion<Instruction *, DbgRecord *>;
 
  class DIBuilder {
    Module &M;
    LLVMContext &VMContext;
 
    DICompileUnit *CUNode; ///< The one compile unit created by this DIBuiler.
 
    SmallVector<TrackingMDNodeRef, 4> EnumTypes;
    /// Track the RetainTypes, since they can be updated later on.
    SmallVector<TrackingMDNodeRef, 4> AllRetainTypes;
    SmallVector<DISubprogram *, 4> AllSubprograms;
    SmallVector<Metadata *, 4> AllGVs;
    SmallVector<TrackingMDNodeRef, 4> ImportedModules;
    /// Map Macro parent (which can be DIMacroFile or nullptr) to a list of
    /// Metadata all of type DIMacroNode.
    /// DIMacroNode's with nullptr parent are DICompileUnit direct children.
    MapVector<MDNode *, SetVector<Metadata *>> AllMacrosPerParent;
 
    /// Track nodes that may be unresolved.
    SmallVector<TrackingMDNodeRef, 4> UnresolvedNodes;
    bool AllowUnresolvedNodes;
 
    /// Each subprogram's preserved local variables, labels, imported entities,
    /// and types.
    ///
    /// Do not use a std::vector.  Some versions of libc++ apparently copy
    /// instead of move on grow operations, and TrackingMDRef is expensive to
    /// copy.
    DenseMap<DISubprogram *, SmallVector<TrackingMDNodeRef, 4>>
        SubprogramTrackedNodes;
 
    SmallVectorImpl<TrackingMDNodeRef> &
    getImportTrackingVector(const DIScope *S) {
      return isa_and_nonnull<DILocalScope>(S)
                 ? getSubprogramNodesTrackingVector(S)
                 : ImportedModules;
    }
    SmallVectorImpl<TrackingMDNodeRef> &
    getSubprogramNodesTrackingVector(const DIScope *S) {
      return SubprogramTrackedNodes[cast<DILocalScope>(S)->getSubprogram()];
    }
 
    /// Create a temporary.
    ///
    /// Create an \a temporary node and track it in \a UnresolvedNodes.
    void trackIfUnresolved(MDNode *N);
 
    /// Internal helper. Track metadata if untracked and insert \p DVR.
    void insertDbgVariableRecord(DbgVariableRecord *DVR,
                                 InsertPosition InsertPt);
 
    /// Internal helper with common code used by insertDbg{Value,Addr}Intrinsic.
    Instruction *insertDbgIntrinsic(llvm::Function *Intrinsic, llvm::Value *Val,
                                    DILocalVariable *VarInfo,
                                    DIExpression *Expr, const DILocation *DL,
                                    InsertPosition InsertPt);
 
  public:
    /// Construct a builder for a module.
    ///
    /// If \c AllowUnresolved, collect unresolved nodes attached to the module
    /// in order to resolve cycles during \a finalize().
    ///
    /// If \p CU is given a value other than nullptr, then set \p CUNode to CU.
    LLVM_ABI explicit DIBuilder(Module &M, bool AllowUnresolved = true,
                                DICompileUnit *CU = nullptr);
    DIBuilder(const DIBuilder &) = delete;
    DIBuilder &operator=(const DIBuilder &) = delete;
 
    /// Construct any deferred debug info descriptors.
    LLVM_ABI void finalize();
 
    /// Finalize a specific subprogram - no new variables may be added to this
    /// subprogram afterwards.
    LLVM_ABI void finalizeSubprogram(DISubprogram *SP);
 
    /// A CompileUnit provides an anchor for all debugging
    /// information generated during this instance of compilation.
    /// \param Lang          Source programming language, eg. dwarf::DW_LANG_C99
    /// \param File          File info.
    /// \param Producer      Identify the producer of debugging information
    ///                      and code.  Usually this is a compiler
    ///                      version string.
    /// \param isOptimized   A boolean flag which indicates whether optimization
    ///                      is enabled or not.
    /// \param Flags         This string lists command line options. This
    ///                      string is directly embedded in debug info
    ///                      output which may be used by a tool
    ///                      analyzing generated debugging information.
    /// \param RV            This indicates runtime version for languages like
    ///                      Objective-C.
    /// \param SplitName     The name of the file that we'll split debug info
    ///                      out into.
    /// \param Kind          The kind of debug information to generate.
    /// \param DWOId         The DWOId if this is a split skeleton compile unit.
    /// \param SplitDebugInlining    Whether to emit inline debug info.
    /// \param DebugInfoForProfiling Whether to emit extra debug info for
    ///                              profile collection.
    /// \param NameTableKind  Whether to emit .debug_gnu_pubnames,
    ///                      .debug_pubnames, or no pubnames at all.
    /// \param SysRoot       The clang system root (value of -isysroot).
    /// \param SDK           The SDK name. On Darwin, this is the last component
    ///                      of the sysroot.
    LLVM_ABI DICompileUnit *
    createCompileUnit(DISourceLanguageName Lang, DIFile *File,
                      StringRef Producer, bool isOptimized, StringRef Flags,
                      unsigned RV, StringRef SplitName = StringRef(),
                      DICompileUnit::DebugEmissionKind Kind =
                          DICompileUnit::DebugEmissionKind::FullDebug,
                      uint64_t DWOId = 0, bool SplitDebugInlining = true,
                      bool DebugInfoForProfiling = false,
                      DICompileUnit::DebugNameTableKind NameTableKind =
                          DICompileUnit::DebugNameTableKind::Default,
                      bool RangesBaseAddress = false, StringRef SysRoot = {},
                      StringRef SDK = {});
 
    /// Create a file descriptor to hold debugging information for a file.
    /// \param Filename  File name.
    /// \param Directory Directory.
    /// \param Checksum  Optional checksum kind (e.g. CSK_MD5, CSK_SHA1, etc.)
    ///                  and value.
    /// \param Source    Optional source text.
    LLVM_ABI DIFile *createFile(
        StringRef Filename, StringRef Directory,
        std::optional<DIFile::ChecksumInfo<StringRef>> Checksum = std::nullopt,
        std::optional<StringRef> Source = std::nullopt);
 
    /// Create debugging information entry for a macro.
    /// \param Parent     Macro parent (could be nullptr).
    /// \param Line       Source line number where the macro is defined.
    /// \param MacroType  DW_MACINFO_define or DW_MACINFO_undef.
    /// \param Name       Macro name.
    /// \param Value      Macro value.
    LLVM_ABI DIMacro *createMacro(DIMacroFile *Parent, unsigned Line,
                                  unsigned MacroType, StringRef Name,
                                  StringRef Value = StringRef());
 
    /// Create debugging information temporary entry for a macro file.
    /// List of macro node direct children will be calculated by DIBuilder,
    /// using the \p Parent relationship.
    /// \param Parent     Macro file parent (could be nullptr).
    /// \param Line       Source line number where the macro file is included.
    /// \param File       File descriptor containing the name of the macro file.
    LLVM_ABI DIMacroFile *createTempMacroFile(DIMacroFile *Parent,
                                              unsigned Line, DIFile *File);
 
    /// Create a single enumerator value.
    LLVM_ABI DIEnumerator *createEnumerator(StringRef Name,
                                            const APSInt &Value);
    LLVM_ABI DIEnumerator *createEnumerator(StringRef Name, uint64_t Val,
                                            bool IsUnsigned = false);
 
    /// Create a DWARF unspecified type.
    LLVM_ABI DIBasicType *createUnspecifiedType(StringRef Name);
 
    /// Create C++11 nullptr type.
    LLVM_ABI DIBasicType *createNullPtrType();
 
    /// Create debugging information entry for a basic
    /// type.
    /// \param Name        Type name.
    /// \param SizeInBits  Size of the type.
    /// \param Encoding    DWARF encoding code, e.g., dwarf::DW_ATE_float.
    /// \param Flags       Optional DWARF attributes, e.g., DW_AT_endianity.
    /// \param NumExtraInhabitants The number of extra inhabitants of the type.
    /// An extra inhabitant is a bit pattern that does not represent a valid
    /// value for instances of a given type. This is used by the Swift language.
    /// \param DataSizeInBits Optionally describes the number of bits used by
    /// the value of the object when this is less than the storage size of
    /// SizeInBits. Default value of zero indicates the object value and storage
    /// sizes are equal.
    LLVM_ABI DIBasicType *
    createBasicType(StringRef Name, uint64_t SizeInBits, unsigned Encoding,
                    DINode::DIFlags Flags = DINode::FlagZero,
                    uint32_t NumExtraInhabitants = 0,
                    uint32_t DataSizeInBits = 0);
 
    /// Create debugging information entry for a basic
    /// type.
    /// \param Name        Type name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the typedef.
    /// \param SizeInBits  Size of the type.
    /// \param Encoding    DWARF encoding code, e.g., dwarf::DW_ATE_float.
    /// \param Flags       Optional DWARF attributes, e.g., DW_AT_endianity.
    /// \param NumExtraInhabitants The number of extra inhabitants of the type.
    /// An extra inhabitant is a bit pattern that does not represent a valid
    /// value for instances of a given type. This is used by the Swift language.
    /// \param DataSizeInBits Optionally describes the number of bits used by
    /// the value of the object when this is less than the storage size of
    /// SizeInBits. Default value of zero indicates the object value and storage
    /// sizes are equal.
    LLVM_ABI DIBasicType *
    createBasicType(StringRef Name, DIFile *File, unsigned LineNo,
                    DIScope *Context, uint64_t SizeInBits, unsigned Encoding,
                    DINode::DIFlags Flags = DINode::FlagZero,
                    uint32_t NumExtraInhabitants = 0,
                    uint32_t DataSizeInBits = 0);
 
    /// Create debugging information entry for a binary fixed-point type.
    /// \param Name        Type name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the typedef.
    /// \param Encoding    DWARF encoding code, either
    ///                    dwarf::DW_ATE_signed_fixed or DW_ATE_unsigned_fixed.
    /// \param Flags       Optional DWARF attributes, e.g., DW_AT_endianity.
    /// \param Factor      Binary scale factor.
    LLVM_ABI DIFixedPointType *
    createBinaryFixedPointType(StringRef Name, DIFile *File, unsigned LineNo,
                               DIScope *Context, uint64_t SizeInBits,
                               uint32_t AlignInBits, unsigned Encoding,
                               DINode::DIFlags Flags, int Factor);
 
    /// Create debugging information entry for a decimal fixed-point type.
    /// \param Name        Type name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the typedef.
    /// \param Encoding    DWARF encoding code, either
    ///                    dwarf::DW_ATE_signed_fixed or DW_ATE_unsigned_fixed.
    /// \param Flags       Optional DWARF attributes, e.g., DW_AT_endianity.
    /// \param Factor      Decimal scale factor.
    LLVM_ABI DIFixedPointType *
    createDecimalFixedPointType(StringRef Name, DIFile *File, unsigned LineNo,
                                DIScope *Context, uint64_t SizeInBits,
                                uint32_t AlignInBits, unsigned Encoding,
                                DINode::DIFlags Flags, int Factor);
 
    /// Create debugging information entry for an arbitrary rational
    /// fixed-point type.
    /// \param Name        Type name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the typedef.
    /// \param Encoding    DWARF encoding code, either
    ///                    dwarf::DW_ATE_signed_fixed or DW_ATE_unsigned_fixed.
    /// \param Flags       Optional DWARF attributes, e.g., DW_AT_endianity.
    /// \param Numerator   Numerator of scale factor.
    /// \param Denominator Denominator of scale factor.
    LLVM_ABI DIFixedPointType *createRationalFixedPointType(
        StringRef Name, DIFile *File, unsigned LineNo, DIScope *Context,
        uint64_t SizeInBits, uint32_t AlignInBits, unsigned Encoding,
        DINode::DIFlags Flags, APInt Numerator, APInt Denominator);
 
    /// Create debugging information entry for a string
    /// type.
    /// \param Name        Type name.
    /// \param SizeInBits  Size of the type.
    LLVM_ABI DIStringType *createStringType(StringRef Name,
                                            uint64_t SizeInBits);
 
    /// Create debugging information entry for Fortran
    /// assumed length string type.
    /// \param Name            Type name.
    /// \param StringLength    String length expressed as DIVariable *.
    /// \param StrLocationExp  Optional memory location of the string.
    LLVM_ABI DIStringType *
    createStringType(StringRef Name, DIVariable *StringLength,
                     DIExpression *StrLocationExp = nullptr);
 
    /// Create debugging information entry for Fortran
    /// assumed length string type.
    /// \param Name             Type name.
    /// \param StringLengthExp  String length expressed in DIExpression form.
    /// \param StrLocationExp   Optional memory location of the string.
    LLVM_ABI DIStringType *
    createStringType(StringRef Name, DIExpression *StringLengthExp,
                     DIExpression *StrLocationExp = nullptr);
 
    /// Create debugging information entry for a qualified
    /// type, e.g. 'const int'.
    /// \param Tag         Tag identifing type, e.g. dwarf::TAG_volatile_type
    /// \param FromTy      Base Type.
    LLVM_ABI DIDerivedType *createQualifiedType(unsigned Tag, DIType *FromTy);
 
    /// Create debugging information entry for a pointer.
    /// \param PointeeTy         Type pointed by this pointer.
    /// \param SizeInBits        Size.
    /// \param AlignInBits       Alignment. (optional)
    /// \param DWARFAddressSpace DWARF address space. (optional)
    /// \param Name              Pointer type name. (optional)
    /// \param Annotations       Member annotations.
    LLVM_ABI DIDerivedType *
    createPointerType(DIType *PointeeTy, uint64_t SizeInBits,
                      uint32_t AlignInBits = 0,
                      std::optional<unsigned> DWARFAddressSpace = std::nullopt,
                      StringRef Name = "", DINodeArray Annotations = nullptr);
 
    /// Create a __ptrauth qualifier.
    LLVM_ABI DIDerivedType *
    createPtrAuthQualifiedType(DIType *FromTy, unsigned Key,
                               bool IsAddressDiscriminated,
                               unsigned ExtraDiscriminator, bool IsaPointer,
                               bool authenticatesNullValues);
 
    /// Create debugging information entry for a pointer to member.
    /// \param PointeeTy Type pointed to by this pointer.
    /// \param SizeInBits  Size.
    /// \param AlignInBits Alignment. (optional)
    /// \param Class Type for which this pointer points to members of.
    LLVM_ABI DIDerivedType *
    createMemberPointerType(DIType *PointeeTy, DIType *Class,
                            uint64_t SizeInBits, uint32_t AlignInBits = 0,
                            DINode::DIFlags Flags = DINode::FlagZero);
 
    /// Create debugging information entry for a c++
    /// style reference or rvalue reference type.
    LLVM_ABI DIDerivedType *createReferenceType(
        unsigned Tag, DIType *RTy, uint64_t SizeInBits = 0,
        uint32_t AlignInBits = 0,
        std::optional<unsigned> DWARFAddressSpace = std::nullopt);
 
    /// Create debugging information entry for a typedef.
    /// \param Ty          Original type.
    /// \param Name        Typedef name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the typedef.
    /// \param AlignInBits Alignment. (optional)
    /// \param Flags       Flags to describe inheritance attribute, e.g. private
    /// \param Annotations Annotations. (optional)
    LLVM_ABI DIDerivedType *
    createTypedef(DIType *Ty, StringRef Name, DIFile *File, unsigned LineNo,
                  DIScope *Context, uint32_t AlignInBits = 0,
                  DINode::DIFlags Flags = DINode::FlagZero,
                  DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a template alias.
    /// \param Ty          Original type.
    /// \param Name        Alias name.
    /// \param File        File where this type is defined.
    /// \param LineNo      Line number.
    /// \param Context     The surrounding context for the alias.
    /// \param TParams     The template arguments.
    /// \param AlignInBits Alignment. (optional)
    /// \param Flags       Flags to describe inheritance attribute (optional),
    ///                    e.g. private.
    /// \param Annotations Annotations. (optional)
    LLVM_ABI DIDerivedType *
    createTemplateAlias(DIType *Ty, StringRef Name, DIFile *File,
                        unsigned LineNo, DIScope *Context, DINodeArray TParams,
                        uint32_t AlignInBits = 0,
                        DINode::DIFlags Flags = DINode::FlagZero,
                        DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a 'friend'.
    LLVM_ABI DIDerivedType *createFriend(DIType *Ty, DIType *FriendTy);
 
    /// Create debugging information entry to establish
    /// inheritance relationship between two types.
    /// \param Ty           Original type.
    /// \param BaseTy       Base type. Ty is inherits from base.
    /// \param BaseOffset   Base offset.
    /// \param VBPtrOffset  Virtual base pointer offset.
    /// \param Flags        Flags to describe inheritance attribute,
    ///                     e.g. private
    LLVM_ABI DIDerivedType *createInheritance(DIType *Ty, DIType *BaseTy,
                                              uint64_t BaseOffset,
                                              uint32_t VBPtrOffset,
                                              DINode::DIFlags Flags);
 
    /// Create debugging information entry for a member.
    /// \param Scope        Member scope.
    /// \param Name         Member name.
    /// \param File         File where this member is defined.
    /// \param LineNo       Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param OffsetInBits Member offset.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Ty           Parent type.
    /// \param Annotations  Member annotations.
    LLVM_ABI DIDerivedType *createMemberType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
        Metadata *SizeInBits, uint32_t AlignInBits, Metadata *OffsetInBits,
        DINode::DIFlags Flags, DIType *Ty, DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a member.
    /// \param Scope        Member scope.
    /// \param Name         Member name.
    /// \param File         File where this member is defined.
    /// \param LineNo       Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param OffsetInBits Member offset.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Ty           Parent type.
    /// \param Annotations  Member annotations.
    LLVM_ABI DIDerivedType *
    createMemberType(DIScope *Scope, StringRef Name, DIFile *File,
                     unsigned LineNo, uint64_t SizeInBits, uint32_t AlignInBits,
                     uint64_t OffsetInBits, DINode::DIFlags Flags, DIType *Ty,
                     DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a variant.  A variant
    /// normally should be a member of a variant part.
    /// \param Scope        Member scope.
    /// \param Name         Member name.
    /// \param File         File where this member is defined.
    /// \param LineNo       Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param OffsetInBits Member offset.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Discriminant The discriminant for this branch; null for
    ///                     the default branch.  This may be a
    ///                     ConstantDataArray if the variant applies
    ///                     for multiple discriminants.
    /// \param Ty           Parent type.
    LLVM_ABI DIDerivedType *createVariantMemberType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
        uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
        Constant *Discriminant, DINode::DIFlags Flags, DIType *Ty);
 
    /// Create debugging information entry for a variant.  A variant
    /// created this way "inlines" multiple members into the enclosing
    /// variant part.
    /// \param Scope        Scope in which this variant is defined.
    /// \param Elements     Variant elements.
    /// \param Discriminant The discriminant for this branch; null for
    ///                     the default branch.  This may be a
    ///                     ConstantDataArray if the variant applies
    ///                     for multiple discriminants.
    /// \param Ty           Parent type.
    LLVM_ABI DIDerivedType *createVariantMemberType(DIScope *Scope,
                                                    DINodeArray Elements,
                                                    Constant *Discriminant,
                                                    DIType *Ty);
 
    /// Create debugging information entry for a bit field member.
    /// \param Scope               Member scope.
    /// \param Name                Member name.
    /// \param File                File where this member is defined.
    /// \param LineNo              Line number.
    /// \param SizeInBits          Member size.
    /// \param OffsetInBits        Member offset.
    /// \param StorageOffsetInBits Member storage offset.
    /// \param Flags               Flags to encode member attribute.
    /// \param Ty                  Parent type.
    /// \param Annotations         Member annotations.
    LLVM_ABI DIDerivedType *createBitFieldMemberType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
        Metadata *SizeInBits, Metadata *OffsetInBits,
        uint64_t StorageOffsetInBits, DINode::DIFlags Flags, DIType *Ty,
        DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a bit field member.
    /// \param Scope               Member scope.
    /// \param Name                Member name.
    /// \param File                File where this member is defined.
    /// \param LineNo              Line number.
    /// \param SizeInBits          Member size.
    /// \param OffsetInBits        Member offset.
    /// \param StorageOffsetInBits Member storage offset.
    /// \param Flags               Flags to encode member attribute.
    /// \param Ty                  Parent type.
    /// \param Annotations         Member annotations.
    LLVM_ABI DIDerivedType *createBitFieldMemberType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
        uint64_t SizeInBits, uint64_t OffsetInBits,
        uint64_t StorageOffsetInBits, DINode::DIFlags Flags, DIType *Ty,
        DINodeArray Annotations = nullptr);
 
    /// Create debugging information entry for a
    /// C++ static data member.
    /// \param Scope      Member scope.
    /// \param Name       Member name.
    /// \param File       File where this member is declared.
    /// \param LineNo     Line number.
    /// \param Ty         Type of the static member.
    /// \param Flags      Flags to encode member attribute, e.g. private.
    /// \param Val        Const initializer of the member.
    /// \param Tag        DWARF tag of the static member.
    /// \param AlignInBits  Member alignment.
    LLVM_ABI DIDerivedType *createStaticMemberType(DIScope *Scope,
                                                   StringRef Name, DIFile *File,
                                                   unsigned LineNo, DIType *Ty,
                                                   DINode::DIFlags Flags,
                                                   Constant *Val, unsigned Tag,
                                                   uint32_t AlignInBits = 0);
 
    /// Create debugging information entry for Objective-C
    /// instance variable.
    /// \param Name         Member name.
    /// \param File         File where this member is defined.
    /// \param LineNo       Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param OffsetInBits Member offset.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Ty           Parent type.
    /// \param PropertyNode Property associated with this ivar.
    LLVM_ABI DIDerivedType *createObjCIVar(StringRef Name, DIFile *File,
                                           unsigned LineNo, uint64_t SizeInBits,
                                           uint32_t AlignInBits,
                                           uint64_t OffsetInBits,
                                           DINode::DIFlags Flags, DIType *Ty,
                                           MDNode *PropertyNode);
 
    /// Create debugging information entry for Objective-C
    /// property.
    /// \param Name         Property name.
    /// \param File         File where this property is defined.
    /// \param LineNumber   Line number.
    /// \param GetterName   Name of the Objective C property getter selector.
    /// \param SetterName   Name of the Objective C property setter selector.
    /// \param PropertyAttributes Objective C property attributes.
    /// \param Ty           Type.
    LLVM_ABI DIObjCProperty *
    createObjCProperty(StringRef Name, DIFile *File, unsigned LineNumber,
                       StringRef GetterName, StringRef SetterName,
                       unsigned PropertyAttributes, DIType *Ty);
 
    /// Create debugging information entry for a class.
    /// \param Scope        Scope in which this class is defined.
    /// \param Name         class name.
    /// \param File         File where this member is defined.
    /// \param LineNumber   Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param OffsetInBits Member offset.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Elements     class members.
    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
    /// \param VTableHolder Debug info of the base class that contains vtable
    ///                     for this type. This is used in
    ///                     DW_AT_containing_type. See DWARF documentation
    ///                     for more info.
    /// \param TemplateParms Template type parameters.
    /// \param UniqueIdentifier A unique identifier for the class.
    LLVM_ABI DICompositeType *createClassType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
        uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
        DINode::DIFlags Flags, DIType *DerivedFrom, DINodeArray Elements,
        unsigned RunTimeLang = 0, DIType *VTableHolder = nullptr,
        MDNode *TemplateParms = nullptr, StringRef UniqueIdentifier = "");
 
    /// Create debugging information entry for a struct.
    /// \param Scope        Scope in which this struct is defined.
    /// \param Name         Struct name.
    /// \param File         File where this member is defined.
    /// \param LineNumber   Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Elements     Struct elements.
    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
    /// \param UniqueIdentifier A unique identifier for the struct.
    /// \param Specification The type that this type completes. This is used by
    /// Swift to represent generic types.
    /// \param NumExtraInhabitants The number of extra inhabitants of the type.
    /// An extra inhabitant is a bit pattern that does not represent a valid
    /// value for instances of a given type. This is used by the Swift language.
    LLVM_ABI DICompositeType *createStructType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
        Metadata *SizeInBits, uint32_t AlignInBits, DINode::DIFlags Flags,
        DIType *DerivedFrom, DINodeArray Elements, unsigned RunTimeLang = 0,
        DIType *VTableHolder = nullptr, StringRef UniqueIdentifier = "",
        DIType *Specification = nullptr, uint32_t NumExtraInhabitants = 0);
 
    /// Create debugging information entry for a struct.
    /// \param Scope        Scope in which this struct is defined.
    /// \param Name         Struct name.
    /// \param File         File where this member is defined.
    /// \param LineNumber   Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Elements     Struct elements.
    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
    /// \param UniqueIdentifier A unique identifier for the struct.
    /// \param Specification The type that this type completes. This is used by
    /// Swift to represent generic types.
    /// \param NumExtraInhabitants The number of extra inhabitants of the type.
    /// An extra inhabitant is a bit pattern that does not represent a valid
    /// value for instances of a given type. This is used by the Swift language.
    LLVM_ABI DICompositeType *createStructType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
        uint64_t SizeInBits, uint32_t AlignInBits, DINode::DIFlags Flags,
        DIType *DerivedFrom, DINodeArray Elements, unsigned RunTimeLang = 0,
        DIType *VTableHolder = nullptr, StringRef UniqueIdentifier = "",
        DIType *Specification = nullptr, uint32_t NumExtraInhabitants = 0);
 
    /// Create debugging information entry for an union.
    /// \param Scope        Scope in which this union is defined.
    /// \param Name         Union name.
    /// \param File         File where this member is defined.
    /// \param LineNumber   Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Elements     Union elements.
    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
    /// \param UniqueIdentifier A unique identifier for the union.
    LLVM_ABI DICompositeType *
    createUnionType(DIScope *Scope, StringRef Name, DIFile *File,
                    unsigned LineNumber, uint64_t SizeInBits,
                    uint32_t AlignInBits, DINode::DIFlags Flags,
                    DINodeArray Elements, unsigned RunTimeLang = 0,
                    StringRef UniqueIdentifier = "");
 
    /// Create debugging information entry for a variant part.  A
    /// variant part normally has a discriminator (though this is not
    /// required) and a number of variant children.
    /// \param Scope        Scope in which this union is defined.
    /// \param Name         Union name.
    /// \param File         File where this member is defined.
    /// \param LineNumber   Line number.
    /// \param SizeInBits   Member size.
    /// \param AlignInBits  Member alignment.
    /// \param Flags        Flags to encode member attribute, e.g. private
    /// \param Discriminator Discriminant member
    /// \param Elements     Variant elements.
    /// \param UniqueIdentifier A unique identifier for the union.
    LLVM_ABI DICompositeType *
    createVariantPart(DIScope *Scope, StringRef Name, DIFile *File,
                      unsigned LineNumber, uint64_t SizeInBits,
                      uint32_t AlignInBits, DINode::DIFlags Flags,
                      DIDerivedType *Discriminator, DINodeArray Elements,
                      StringRef UniqueIdentifier = "");
 
    /// Create debugging information for template
    /// type parameter.
    /// \param Scope        Scope in which this type is defined.
    /// \param Name         Type parameter name.
    /// \param Ty           Parameter type.
    /// \param IsDefault    Parameter is default or not
    LLVM_ABI DITemplateTypeParameter *
    createTemplateTypeParameter(DIScope *Scope, StringRef Name, DIType *Ty,
                                bool IsDefault);
 
    /// Create debugging information for template
    /// value parameter.
    /// \param Scope        Scope in which this type is defined.
    /// \param Name         Value parameter name.
    /// \param Ty           Parameter type.
    /// \param IsDefault    Parameter is default or not
    /// \param Val          Constant parameter value.
    LLVM_ABI DITemplateValueParameter *
    createTemplateValueParameter(DIScope *Scope, StringRef Name, DIType *Ty,
                                 bool IsDefault, Constant *Val);
 
    /// Create debugging information for a template template parameter.
    /// \param Scope        Scope in which this type is defined.
    /// \param Name         Value parameter name.
    /// \param Ty           Parameter type.
    /// \param Val          The fully qualified name of the template.
    /// \param IsDefault    Parameter is default or not.
    LLVM_ABI DITemplateValueParameter *
    createTemplateTemplateParameter(DIScope *Scope, StringRef Name, DIType *Ty,
                                    StringRef Val, bool IsDefault = false);
 
    /// Create debugging information for a template parameter pack.
    /// \param Scope        Scope in which this type is defined.
    /// \param Name         Value parameter name.
    /// \param Ty           Parameter type.
    /// \param Val          An array of types in the pack.
    LLVM_ABI DITemplateValueParameter *
    createTemplateParameterPack(DIScope *Scope, StringRef Name, DIType *Ty,
                                DINodeArray Val);
 
    /// Create debugging information entry for an array.
    /// \param Size         Array size.
    /// \param AlignInBits  Alignment.
    /// \param Ty           Element type.
    /// \param Subscripts   Subscripts.
    /// \param DataLocation The location of the raw data of a descriptor-based
    ///                     Fortran array, either a DIExpression* or
    ///                     a DIVariable*.
    /// \param Associated   The associated attribute of a descriptor-based
    ///                     Fortran array, either a DIExpression* or
    ///                     a DIVariable*.
    /// \param Allocated    The allocated attribute of a descriptor-based
    ///                     Fortran array, either a DIExpression* or
    ///                     a DIVariable*.
    /// \param Rank         The rank attribute of a descriptor-based
    ///                     Fortran array, either a DIExpression* or
    ///                     a DIVariable*.
    LLVM_ABI DICompositeType *createArrayType(
        uint64_t Size, uint32_t AlignInBits, DIType *Ty, DINodeArray Subscripts,
        PointerUnion<DIExpression *, DIVariable *> DataLocation = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Associated = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Allocated = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Rank = nullptr);
 
    /// Create debugging information entry for an array.
    /// \param Scope          Scope in which this enumeration is defined.
    /// \param Name           Union name.
    /// \param File           File where this member is defined.
    /// \param LineNumber     Line number.
    /// \param Size           Array size.
    /// \param AlignInBits    Alignment.
    /// \param Ty             Element type.
    /// \param Subscripts     Subscripts.
    /// \param DataLocation   The location of the raw data of a descriptor-based
    ///                       Fortran array, either a DIExpression* or
    ///                       a DIVariable*.
    /// \param Associated     The associated attribute of a descriptor-based
    ///                       Fortran array, either a DIExpression* or
    ///                       a DIVariable*.
    /// \param Allocated      The allocated attribute of a descriptor-based
    ///                       Fortran array, either a DIExpression* or
    ///                       a DIVariable*.
    /// \param Rank           The rank attribute of a descriptor-based
    ///                       Fortran array, either a DIExpression* or
    ///                       a DIVariable*.
    /// \param BitStride      The bit size of an element of the array.
    LLVM_ABI DICompositeType *createArrayType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
        uint64_t Size, uint32_t AlignInBits, DIType *Ty, DINodeArray Subscripts,
        PointerUnion<DIExpression *, DIVariable *> DataLocation = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Associated = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Allocated = nullptr,
        PointerUnion<DIExpression *, DIVariable *> Rank = nullptr,
        Metadata *BitStride = nullptr);
 
    /// Create debugging information entry for a vector type.
    /// \param Size         Array size.
    /// \param AlignInBits  Alignment.
    /// \param Ty           Element type.
    /// \param Subscripts   Subscripts.
    LLVM_ABI DICompositeType *createVectorType(uint64_t Size,
                                               uint32_t AlignInBits, DIType *Ty,
                                               DINodeArray Subscripts,
                                               Metadata *BitStride = nullptr);
 
    /// Create debugging information entry for an
    /// enumeration.
    /// \param Scope          Scope in which this enumeration is defined.
    /// \param Name           Union name.
    /// \param File           File where this member is defined.
    /// \param LineNumber     Line number.
    /// \param SizeInBits     Member size.
    /// \param AlignInBits    Member alignment.
    /// \param Elements       Enumeration elements.
    /// \param UnderlyingType Underlying type of a C++11/ObjC fixed enum.
    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
    /// \param UniqueIdentifier A unique identifier for the enum.
    /// \param IsScoped Boolean flag indicate if this is C++11/ObjC 'enum
    /// class'.
    LLVM_ABI DICompositeType *createEnumerationType(
        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
        uint64_t SizeInBits, uint32_t AlignInBits, DINodeArray Elements,
        DIType *UnderlyingType, unsigned RunTimeLang = 0,
        StringRef UniqueIdentifier = "", bool IsScoped = false,
        std::optional<uint32_t> EnumKind = std::nullopt);
    /// Create debugging information entry for a set.
    /// \param Scope          Scope in which this set is defined.
    /// \param Name           Set name.
    /// \param File           File where this set is defined.
    /// \param LineNo         Line number.
    /// \param SizeInBits     Set size.
    /// \param AlignInBits    Set alignment.
    /// \param Ty             Base type of the set.
    LLVM_ABI DIDerivedType *createSetType(DIScope *Scope, StringRef Name,
                                          DIFile *File, unsigned LineNo,
                                          uint64_t SizeInBits,
                                          uint32_t AlignInBits, DIType *Ty);
 
    /// Create subroutine type.
    /// \param ParameterTypes  An array of subroutine parameter types. This
    ///                        includes return type at 0th index.
    /// \param Flags           E.g.: LValueReference.
    ///                        These flags are used to emit dwarf attributes.
    /// \param CC              Calling convention, e.g. dwarf::DW_CC_normal
    LLVM_ABI DISubroutineType *
    createSubroutineType(DITypeArray ParameterTypes,
                         DINode::DIFlags Flags = DINode::FlagZero,
                         unsigned CC = 0);
 
    /// Create a distinct clone of \p SP with FlagArtificial set.
    LLVM_ABI static DISubprogram *createArtificialSubprogram(DISubprogram *SP);
 
    /// Create a uniqued clone of \p Ty with FlagArtificial set.
    LLVM_ABI static DIType *createArtificialType(DIType *Ty);
 
    /// Create a uniqued clone of \p Ty with FlagObjectPointer set.
    /// If \p Implicit is true, also set FlagArtificial.
    LLVM_ABI static DIType *createObjectPointerType(DIType *Ty, bool Implicit);
 
    /// Create a type describing a subrange of another type.
    /// \param Scope          Scope in which this set is defined.
    /// \param Name           Set name.
    /// \param File           File where this set is defined.
    /// \param LineNo         Line number.
    /// \param SizeInBits     Size.
    /// \param AlignInBits    Alignment.
    /// \param Flags          Flags to encode attributes.
    /// \param Ty             Base type.
    /// \param LowerBound     Lower bound.
    /// \param UpperBound     Upper bound.
    /// \param Stride         Stride, if any.
    /// \param Bias           Bias, if any.
    LLVM_ABI DISubrangeType *
    createSubrangeType(StringRef Name, DIFile *File, unsigned LineNo,
                       DIScope *Scope, uint64_t SizeInBits,
                       uint32_t AlignInBits, DINode::DIFlags Flags, DIType *Ty,
                       Metadata *LowerBound, Metadata *UpperBound,
                       Metadata *Stride, Metadata *Bias);
 
    /// Create a permanent forward-declared type.
    LLVM_ABI DICompositeType *
    createForwardDecl(unsigned Tag, StringRef Name, DIScope *Scope, DIFile *F,
                      unsigned Line, unsigned RuntimeLang = 0,
                      uint64_t SizeInBits = 0, uint32_t AlignInBits = 0,
                      StringRef UniqueIdentifier = "",
                      std::optional<uint32_t> EnumKind = std::nullopt);
 
    /// Create a temporary forward-declared type.
    LLVM_ABI DICompositeType *createReplaceableCompositeType(
        unsigned Tag, StringRef Name, DIScope *Scope, DIFile *F, unsigned Line,
        unsigned RuntimeLang = 0, uint64_t SizeInBits = 0,
        uint32_t AlignInBits = 0, DINode::DIFlags Flags = DINode::FlagFwdDecl,
        StringRef UniqueIdentifier = "", DINodeArray Annotations = nullptr,
        std::optional<uint32_t> EnumKind = std::nullopt);
 
    /// Retain DIScope* in a module even if it is not referenced
    /// through debug info anchors.
    LLVM_ABI void retainType(DIScope *T);
 
    /// Create unspecified parameter type
    /// for a subroutine type.
    LLVM_ABI DIBasicType *createUnspecifiedParameter();
 
    /// Get a DINodeArray, create one if required.
    LLVM_ABI DINodeArray getOrCreateArray(ArrayRef<Metadata *> Elements);
 
    /// Get a DIMacroNodeArray, create one if required.
    LLVM_ABI DIMacroNodeArray
    getOrCreateMacroArray(ArrayRef<Metadata *> Elements);
 
    /// Get a DITypeArray, create one if required.
    LLVM_ABI DITypeArray getOrCreateTypeArray(ArrayRef<Metadata *> Elements);
 
    /// Create a descriptor for a value range.  This
    /// implicitly uniques the values returned.
    LLVM_ABI DISubrange *getOrCreateSubrange(int64_t Lo, int64_t Count);
    LLVM_ABI DISubrange *getOrCreateSubrange(int64_t Lo, Metadata *CountNode);
    LLVM_ABI DISubrange *getOrCreateSubrange(Metadata *Count,
                                             Metadata *LowerBound,
                                             Metadata *UpperBound,
                                             Metadata *Stride);
 
    LLVM_ABI DIGenericSubrange *
    getOrCreateGenericSubrange(DIGenericSubrange::BoundType Count,
                               DIGenericSubrange::BoundType LowerBound,
                               DIGenericSubrange::BoundType UpperBound,
                               DIGenericSubrange::BoundType Stride);
 
    /// Create a new descriptor for the specified variable.
    /// \param Context     Variable scope.
    /// \param Name        Name of the variable.
    /// \param LinkageName Mangled  name of the variable.
    /// \param File        File where this variable is defined.
    /// \param LineNo      Line number.
    /// \param Ty          Variable Type.
    /// \param IsLocalToUnit Boolean flag indicate whether this variable is
    ///                      externally visible or not.
    /// \param Expr        The location of the global relative to the attached
    ///                    GlobalVariable.
    /// \param Decl        Reference to the corresponding declaration.
    /// \param AlignInBits Variable alignment(or 0 if no alignment attr was
    ///                    specified)
    LLVM_ABI DIGlobalVariableExpression *createGlobalVariableExpression(
        DIScope *Context, StringRef Name, StringRef LinkageName, DIFile *File,
        unsigned LineNo, DIType *Ty, bool IsLocalToUnit, bool isDefined = true,
        DIExpression *Expr = nullptr, MDNode *Decl = nullptr,
        MDTuple *TemplateParams = nullptr, uint32_t AlignInBits = 0,
        DINodeArray Annotations = nullptr);
 
    /// Identical to createGlobalVariable
    /// except that the resulting DbgNode is temporary and meant to be RAUWed.
    LLVM_ABI DIGlobalVariable *createTempGlobalVariableFwdDecl(
        DIScope *Context, StringRef Name, StringRef LinkageName, DIFile *File,
        unsigned LineNo, DIType *Ty, bool IsLocalToUnit, MDNode *Decl = nullptr,
        MDTuple *TemplateParams = nullptr, uint32_t AlignInBits = 0);
 
    /// Create a new descriptor for an auto variable.  This is a local variable
    /// that is not a subprogram parameter.
    ///
    /// \c Scope must be a \a DILocalScope, and thus its scope chain eventually
    /// leads to a \a DISubprogram.
    ///
    /// If \c AlwaysPreserve, this variable will be referenced from its
    /// containing subprogram, and will survive some optimizations.
    LLVM_ABI DILocalVariable *
    createAutoVariable(DIScope *Scope, StringRef Name, DIFile *File,
                       unsigned LineNo, DIType *Ty, bool AlwaysPreserve = false,
                       DINode::DIFlags Flags = DINode::FlagZero,
                       uint32_t AlignInBits = 0);
 
    /// Create a new descriptor for an label.
    ///
    /// \c Scope must be a \a DILocalScope, and thus its scope chain eventually
    /// leads to a \a DISubprogram.
    LLVM_ABI DILabel *createLabel(DIScope *Scope, StringRef Name, DIFile *File,
                                  unsigned LineNo, unsigned Column,
                                  bool IsArtificial,
                                  std::optional<unsigned> CoroSuspendIdx,
                                  bool AlwaysPreserve = false);
 
    /// Create a new descriptor for a parameter variable.
    ///
    /// \c Scope must be a \a DILocalScope, and thus its scope chain eventually
    /// leads to a \a DISubprogram.
    ///
    /// \c ArgNo is the index (starting from \c 1) of this variable in the
    /// subprogram parameters.  \c ArgNo should not conflict with other
    /// parameters of the same subprogram.
    ///
    /// If \c AlwaysPreserve, this variable will be referenced from its
    /// containing subprogram, and will survive some optimizations.
    LLVM_ABI DILocalVariable *
    createParameterVariable(DIScope *Scope, StringRef Name, unsigned ArgNo,
                            DIFile *File, unsigned LineNo, DIType *Ty,
                            bool AlwaysPreserve = false,
                            DINode::DIFlags Flags = DINode::FlagZero,
                            DINodeArray Annotations = nullptr);
 
    /// Create a new descriptor for the specified
    /// variable which has a complex address expression for its address.
    /// \param Addr        An array of complex address operations.
    LLVM_ABI DIExpression *createExpression(ArrayRef<uint64_t> Addr = {});
 
    /// Create an expression for a variable that does not have an address, but
    /// does have a constant value.
    DIExpression *createConstantValueExpression(uint64_t Val) {
      return DIExpression::get(
          VMContext, {dwarf::DW_OP_constu, Val, dwarf::DW_OP_stack_value});
    }
 
    /// Create a new descriptor for the specified subprogram.
    /// See comments in DISubprogram* for descriptions of these fields.
    /// \param Scope         Function scope.
    /// \param Name          Function name.
    /// \param LinkageName   Mangled function name.
    /// \param File          File where this variable is defined.
    /// \param LineNo        Line number.
    /// \param Ty            Function type.
    /// \param ScopeLine     Set to the beginning of the scope this starts
    /// \param Flags         e.g. is this function prototyped or not.
    ///                      These flags are used to emit dwarf attributes.
    /// \param SPFlags       Additional flags specific to subprograms.
    /// \param TParams       Function template parameters.
    /// \param ThrownTypes   Exception types this function may throw.
    /// \param Annotations   Attribute Annotations.
    /// \param TargetFuncName The name of the target function if this is
    ///                       a trampoline.
    /// \param UseKeyInstructions Instruct DWARF emission to interpret Key
    /// Instructions metadata on instructions to determine is_stmt placement.
    LLVM_ABI DISubprogram *createFunction(
        DIScope *Scope, StringRef Name, StringRef LinkageName, DIFile *File,
        unsigned LineNo, DISubroutineType *Ty, unsigned ScopeLine,
        DINode::DIFlags Flags = DINode::FlagZero,
        DISubprogram::DISPFlags SPFlags = DISubprogram::SPFlagZero,
        DITemplateParameterArray TParams = nullptr,
        DISubprogram *Decl = nullptr, DITypeArray ThrownTypes = nullptr,
        DINodeArray Annotations = nullptr, StringRef TargetFuncName = "",
        bool UseKeyInstructions = false);
 
    /// Identical to createFunction,
    /// except that the resulting DbgNode is meant to be RAUWed.
    LLVM_ABI DISubprogram *createTempFunctionFwdDecl(
        DIScope *Scope, StringRef Name, StringRef LinkageName, DIFile *File,
        unsigned LineNo, DISubroutineType *Ty, unsigned ScopeLine,
        DINode::DIFlags Flags = DINode::FlagZero,
        DISubprogram::DISPFlags SPFlags = DISubprogram::SPFlagZero,
        DITemplateParameterArray TParams = nullptr,
        DISubprogram *Decl = nullptr, DITypeArray ThrownTypes = nullptr);
 
    /// Create a new descriptor for the specified C++ method.
    /// See comments in \a DISubprogram* for descriptions of these fields.
    /// \param Scope         Function scope.
    /// \param Name          Function name.
    /// \param LinkageName   Mangled function name.
    /// \param File          File where this variable is defined.
    /// \param LineNo        Line number.
    /// \param Ty            Function type.
    /// \param VTableIndex   Index no of this method in virtual table, or -1u if
    ///                      unrepresentable.
    /// \param ThisAdjustment
    ///                      MS ABI-specific adjustment of 'this' that occurs
    ///                      in the prologue.
    /// \param VTableHolder  Type that holds vtable.
    /// \param Flags         e.g. is this function prototyped or not.
    ///                      This flags are used to emit dwarf attributes.
    /// \param SPFlags       Additional flags specific to subprograms.
    /// \param TParams       Function template parameters.
    /// \param ThrownTypes   Exception types this function may throw.
    /// \param UseKeyInstructions Enable Key Instructions debug info.
    LLVM_ABI DISubprogram *createMethod(
        DIScope *Scope, StringRef Name, StringRef LinkageName, DIFile *File,
        unsigned LineNo, DISubroutineType *Ty, unsigned VTableIndex = 0,
        int ThisAdjustment = 0, DIType *VTableHolder = nullptr,
        DINode::DIFlags Flags = DINode::FlagZero,
        DISubprogram::DISPFlags SPFlags = DISubprogram::SPFlagZero,
        DITemplateParameterArray TParams = nullptr,
        DITypeArray ThrownTypes = nullptr, bool UseKeyInstructions = false);
 
    /// Create common block entry for a Fortran common block.
    /// \param Scope       Scope of this common block.
    /// \param decl        Global variable declaration.
    /// \param Name        The name of this common block.
    /// \param File        The file this common block is defined.
    /// \param LineNo      Line number.
    LLVM_ABI DICommonBlock *createCommonBlock(DIScope *Scope,
                                              DIGlobalVariable *decl,
                                              StringRef Name, DIFile *File,
                                              unsigned LineNo);
 
    /// This creates new descriptor for a namespace with the specified
    /// parent scope.
    /// \param Scope       Namespace scope
    /// \param Name        Name of this namespace
    /// \param ExportSymbols True for C++ inline namespaces.
    LLVM_ABI DINamespace *createNameSpace(DIScope *Scope, StringRef Name,
                                          bool ExportSymbols);
 
    /// This creates new descriptor for a module with the specified
    /// parent scope.
    /// \param Scope       Parent scope
    /// \param Name        Name of this module
    /// \param ConfigurationMacros
    ///                    A space-separated shell-quoted list of -D macro
    ///                    definitions as they would appear on a command line.
    /// \param IncludePath The path to the module map file.
    /// \param APINotesFile The path to an API notes file for this module.
    /// \param File        Source file of the module.
    ///                    Used for Fortran modules.
    /// \param LineNo      Source line number of the module.
    ///                    Used for Fortran modules.
    /// \param IsDecl      This is a module declaration; default to false;
    ///                    when set to true, only Scope and Name are required
    ///                    as this entry is just a hint for the debugger to find
    ///                    the corresponding definition in the global scope.
    LLVM_ABI DIModule *createModule(DIScope *Scope, StringRef Name,
                                    StringRef ConfigurationMacros,
                                    StringRef IncludePath,
                                    StringRef APINotesFile = {},
                                    DIFile *File = nullptr, unsigned LineNo = 0,
                                    bool IsDecl = false);
 
    /// This creates a descriptor for a lexical block with a new file
    /// attached. This merely extends the existing
    /// lexical block as it crosses a file.
    /// \param Scope       Lexical block.
    /// \param File        Source file.
    /// \param Discriminator DWARF path discriminator value.
    LLVM_ABI DILexicalBlockFile *
    createLexicalBlockFile(DIScope *Scope, DIFile *File,
                           unsigned Discriminator = 0);
 
    /// This creates a descriptor for a lexical block with the
    /// specified parent context.
    /// \param Scope         Parent lexical scope.
    /// \param File          Source file.
    /// \param Line          Line number.
    /// \param Col           Column number.
    LLVM_ABI DILexicalBlock *createLexicalBlock(DIScope *Scope, DIFile *File,
                                                unsigned Line, unsigned Col);
 
    /// Create a descriptor for an imported module.
    /// \param Context        The scope this module is imported into
    /// \param NS             The namespace being imported here.
    /// \param File           File where the declaration is located.
    /// \param Line           Line number of the declaration.
    /// \param Elements       Renamed elements.
    LLVM_ABI DIImportedEntity *
    createImportedModule(DIScope *Context, DINamespace *NS, DIFile *File,
                         unsigned Line, DINodeArray Elements = nullptr);
 
    /// Create a descriptor for an imported module.
    /// \param Context The scope this module is imported into.
    /// \param NS      An aliased namespace.
    /// \param File    File where the declaration is located.
    /// \param Line    Line number of the declaration.
    /// \param Elements       Renamed elements.
    LLVM_ABI DIImportedEntity *
    createImportedModule(DIScope *Context, DIImportedEntity *NS, DIFile *File,
                         unsigned Line, DINodeArray Elements = nullptr);
 
    /// Create a descriptor for an imported module.
    /// \param Context        The scope this module is imported into.
    /// \param M              The module being imported here
    /// \param File           File where the declaration is located.
    /// \param Line           Line number of the declaration.
    /// \param Elements       Renamed elements.
    LLVM_ABI DIImportedEntity *
    createImportedModule(DIScope *Context, DIModule *M, DIFile *File,
                         unsigned Line, DINodeArray Elements = nullptr);
 
    /// Create a descriptor for an imported function.
    /// \param Context The scope this module is imported into.
    /// \param Decl    The declaration (or definition) of a function, type, or
    ///                variable.
    /// \param File    File where the declaration is located.
    /// \param Line    Line number of the declaration.
    /// \param Elements       Renamed elements.
    LLVM_ABI DIImportedEntity *
    createImportedDeclaration(DIScope *Context, DINode *Decl, DIFile *File,
                              unsigned Line, StringRef Name = "",
                              DINodeArray Elements = nullptr);
 
    /// Insert a new llvm.dbg.declare intrinsic call.
    /// \param Storage     llvm::Value of the variable
    /// \param VarInfo     Variable's debug info descriptor.
    /// \param Expr        A complex location expression.
    /// \param DL          Debug info location.
    /// \param InsertAtEnd Location for the new intrinsic.
    LLVM_ABI DbgInstPtr insertDeclare(llvm::Value *Storage,
                                      DILocalVariable *VarInfo,
                                      DIExpression *Expr, const DILocation *DL,
                                      BasicBlock *InsertAtEnd);
 
    /// Insert a new llvm.dbg.assign intrinsic call.
    /// \param LinkedInstr   Instruction with a DIAssignID to link with the new
    ///                      intrinsic. The intrinsic will be inserted after
    ///                      this instruction.
    /// \param Val           The value component of this dbg.assign.
    /// \param SrcVar        Variable's debug info descriptor.
    /// \param ValExpr       A complex location expression to modify \p Val.
    /// \param Addr          The address component (store destination).
    /// \param AddrExpr      A complex location expression to modify \p Addr.
    ///                      NOTE: \p ValExpr carries the FragInfo for the
    ///                      variable.
    /// \param DL            Debug info location, usually: (line: 0,
    ///                      column: 0, scope: var-decl-scope). See
    ///                      getDebugValueLoc.
    LLVM_ABI DbgInstPtr insertDbgAssign(Instruction *LinkedInstr, Value *Val,
                                        DILocalVariable *SrcVar,
                                        DIExpression *ValExpr, Value *Addr,
                                        DIExpression *AddrExpr,
                                        const DILocation *DL);
 
    /// Insert a new llvm.dbg.declare intrinsic call.
    /// \param Storage      llvm::Value of the variable
    /// \param VarInfo      Variable's debug info descriptor.
    /// \param Expr         A complex location expression.
    /// \param DL           Debug info location.
    /// \param InsertPt     Location for the new intrinsic.
    LLVM_ABI DbgInstPtr insertDeclare(llvm::Value *Storage,
                                      DILocalVariable *VarInfo,
                                      DIExpression *Expr, const DILocation *DL,
                                      InsertPosition InsertPt);
 
    /// Insert a new llvm.dbg.declare_value intrinsic call.
    /// \param Storage      llvm::Value of the variable
    /// \param VarInfo      Variable's debug info descriptor.
    /// \param Expr         A complex location expression.
    /// \param DL           Debug info location.
    /// \param InsertPt     Location for the new intrinsic.
    LLVM_ABI DbgInstPtr insertDeclareValue(llvm::Value *Storage,
                                           DILocalVariable *VarInfo,
                                           DIExpression *Expr,
                                           const DILocation *DL,
                                           InsertPosition InsertPt);
 
    /// Insert a new llvm.dbg.label intrinsic call.
    /// \param LabelInfo    Label's debug info descriptor.
    /// \param DL           Debug info location.
    /// \param InsertBefore Location for the new intrinsic.
    LLVM_ABI DbgInstPtr insertLabel(DILabel *LabelInfo, const DILocation *DL,
                                    InsertPosition InsertPt);
 
    /// Insert a new llvm.dbg.value intrinsic call.
    /// \param Val          llvm::Value of the variable
    /// \param VarInfo      Variable's debug info descriptor.
    /// \param Expr         A complex location expression.
    /// \param DL           Debug info location.
    /// \param InsertPt     Location for the new intrinsic.
    LLVM_ABI DbgInstPtr insertDbgValueIntrinsic(llvm::Value *Val,
                                                DILocalVariable *VarInfo,
                                                DIExpression *Expr,
                                                const DILocation *DL,
                                                InsertPosition InsertPt);
 
    /// Replace the vtable holder in the given type.
    ///
    /// If this creates a self reference, it may orphan some unresolved cycles
    /// in the operands of \c T, so \a DIBuilder needs to track that.
    LLVM_ABI void replaceVTableHolder(DICompositeType *&T,
                                      DIType *VTableHolder);
 
    /// Replace arrays on a composite type.
    ///
    /// If \c T is resolved, but the arrays aren't -- which can happen if \c T
    /// has a self-reference -- \a DIBuilder needs to track the array to
    /// resolve cycles.
    LLVM_ABI void replaceArrays(DICompositeType *&T, DINodeArray Elements,
                                DINodeArray TParams = DINodeArray());
 
    /// Replace a temporary node.
    ///
    /// Call \a MDNode::replaceAllUsesWith() on \c N, replacing it with \c
    /// Replacement.
    ///
    /// If \c Replacement is the same as \c N.get(), instead call \a
    /// MDNode::replaceWithUniqued().  In this case, the uniqued node could
    /// have a different address, so we return the final address.
    template <class NodeTy>
    NodeTy *replaceTemporary(TempMDNode &&N, NodeTy *Replacement) {
      if (N.get() == Replacement)
        return cast<NodeTy>(MDNode::replaceWithUniqued(std::move(N)));
 
      N->replaceAllUsesWith(Replacement);
      return Replacement;
    }
  };
 
  // Create wrappers for C Binding types (see CBindingWrapping.h).
  DEFINE_ISA_CONVERSION_FUNCTIONS(DIBuilder, LLVMDIBuilderRef)
 
} // end namespace llvm
 
#endif // LLVM_IR_DIBUILDER_H