Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- 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 <algorithm>

#include <cstdint>

#include <optional>

namespace llvm {

  class BasicBlock;

  class Constant;

  class Function;

  class Instruction;

  class LLVMContext;

  class Module;

  class Value;

  class DbgAssignIntrinsic;

  class DIBuilder {

    Module &M;

    LLVMContext &VMContext;

    DICompileUnit *CUNode;   ///< The one compile unit created by this DIBuiler.

    Function *DeclareFn;     ///< llvm.dbg.declare

    Function *ValueFn;       ///< llvm.dbg.value

    Function *LabelFn;       ///< llvm.dbg.label

    Function *AddrFn;        ///< llvm.dbg.addr

    Function *AssignFn;      ///< llvm.dbg.assign

    SmallVector<TrackingMDNodeRef, 4> AllEnumTypes;

    /// Track the RetainTypes, since they can be updated later on.

    SmallVector<TrackingMDNodeRef, 4> AllRetainTypes;

    SmallVector<Metadata *, 4> AllSubprograms;

    SmallVector<Metadata *, 4> AllGVs;

    SmallVector<TrackingMDNodeRef, 4> AllImportedModules;

    /// 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.

    ///

    /// 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<MDNode *, SmallVector<TrackingMDNodeRef, 1>> PreservedVariables;

    /// Each subprogram's preserved labels.

    DenseMap<MDNode *, SmallVector<TrackingMDNodeRef, 1>> PreservedLabels;

    /// Create a temporary.

    ///

    /// Create an \a temporary node and track it in \a UnresolvedNodes.

    void trackIfUnresolved(MDNode *N);

    /// Internal helper for insertDeclare.

    Instruction *insertDeclare(llvm::Value *Storage, DILocalVariable *VarInfo,

                               DIExpression *Expr, const DILocation *DL,

                               BasicBlock *InsertBB, Instruction *InsertBefore);

    /// Internal helper for insertLabel.

    Instruction *insertLabel(DILabel *LabelInfo, const DILocation *DL,

                             BasicBlock *InsertBB, Instruction *InsertBefore);

    /// 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,

                                    BasicBlock *InsertBB,

                                    Instruction *InsertBefore);

    /// Internal helper for insertDbgValueIntrinsic.

    Instruction *

    insertDbgValueIntrinsic(llvm::Value *Val, DILocalVariable *VarInfo,

                            DIExpression *Expr, const DILocation *DL,

                            BasicBlock *InsertBB, Instruction *InsertBefore);

    /// Internal helper for insertDbgAddrIntrinsic.

    Instruction *

    insertDbgAddrIntrinsic(llvm::Value *Val, DILocalVariable *VarInfo,

                           DIExpression *Expr, const DILocation *DL,

                           BasicBlock *InsertBB, Instruction *InsertBefore);

  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.

    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.

    void finalize();

    /// Finalize a specific subprogram - no new variables may be added to this

    /// subprogram afterwards.

    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.

    DICompileUnit *

    createCompileUnit(unsigned 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.

    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.

    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.

    DIMacroFile *createTempMacroFile(DIMacroFile *Parent, unsigned Line,

                                     DIFile *File);

    /// Create a single enumerator value.

    DIEnumerator *createEnumerator(StringRef Name, const APSInt &Value);

    DIEnumerator *createEnumerator(StringRef Name, uint64_t Val,

                                   bool IsUnsigned = false);

    /// Create a DWARF unspecified type.

    DIBasicType *createUnspecifiedType(StringRef Name);

    /// Create C++11 nullptr type.

    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.

    DIBasicType *createBasicType(StringRef Name, uint64_t SizeInBits,

                                 unsigned Encoding,

                                 DINode::DIFlags Flags = DINode::FlagZero);

    /// Create debugging information entry for a string

    /// type.

    /// \param Name        Type name.

    /// \param SizeInBits  Size of the type.

    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.

    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.

    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.

    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.

    DIDerivedType *

    createPointerType(DIType *PointeeTy, uint64_t SizeInBits,

                      uint32_t AlignInBits = 0,

                      std::optional<unsigned> DWARFAddressSpace = std::nullopt,

                      StringRef Name = "", DINodeArray Annotations = nullptr);

    /// 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.

    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.

    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)

    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 'friend'.

    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

    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.

    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

    /// \param Ty           Parent type.

    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 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.

    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 AlignInBits  Member alignment.

    DIDerivedType *createStaticMemberType(DIScope *Scope, StringRef Name,

                                          DIFile *File, unsigned LineNo,

                                          DIType *Ty, DINode::DIFlags Flags,

                                          Constant *Val,

                                          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.

    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.

    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 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.

    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,

        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.

    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 = "");

    /// 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.

    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.

    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

    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.

    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.

    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.

    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*.

    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 a vector type.

    /// \param Size         Array size.

    /// \param AlignInBits  Alignment.

    /// \param Ty           Element type.

    /// \param Subscripts   Subscripts.

    DICompositeType *createVectorType(uint64_t Size, uint32_t AlignInBits,

                                      DIType *Ty, DINodeArray Subscripts);

    /// 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 UniqueIdentifier A unique identifier for the enum.

    /// \param IsScoped Boolean flag indicate if this is C++11/ObjC 'enum class'.

    DICompositeType *createEnumerationType(

        DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,

        uint64_t SizeInBits, uint32_t AlignInBits, DINodeArray Elements,

        DIType *UnderlyingType, StringRef UniqueIdentifier = "", bool IsScoped = false);

    /// 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.

    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

    DISubroutineType *

    createSubroutineType(DITypeRefArray ParameterTypes,

                         DINode::DIFlags Flags = DINode::FlagZero,

                         unsigned CC = 0);

    /// Create a distinct clone of \p SP with FlagArtificial set.

    static DISubprogram *createArtificialSubprogram(DISubprogram *SP);

    /// Create a uniqued clone of \p Ty with FlagArtificial set.

    static DIType *createArtificialType(DIType *Ty);

    /// Create a uniqued clone of \p Ty with FlagObjectPointer and

    /// FlagArtificial set.

    static DIType *createObjectPointerType(DIType *Ty);

    /// Create a permanent forward-declared type.

    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 = "");

    /// Create a temporary forward-declared type.

    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);

    /// Retain DIScope* in a module even if it is not referenced

    /// through debug info anchors.

    void retainType(DIScope *T);

    /// Create unspecified parameter type

    /// for a subroutine type.

    DIBasicType *createUnspecifiedParameter();

    /// Get a DINodeArray, create one if required.

    DINodeArray getOrCreateArray(ArrayRef<Metadata *> Elements);

    /// Get a DIMacroNodeArray, create one if required.

    DIMacroNodeArray getOrCreateMacroArray(ArrayRef<Metadata *> Elements);

    /// Get a DITypeRefArray, create one if required.

    DITypeRefArray getOrCreateTypeArray(ArrayRef<Metadata *> Elements);

    /// Create a descriptor for a value range.  This

    /// implicitly uniques the values returned.

    DISubrange *getOrCreateSubrange(int64_t Lo, int64_t Count);

    DISubrange *getOrCreateSubrange(int64_t Lo, Metadata *CountNode);

    DISubrange *getOrCreateSubrange(Metadata *Count, Metadata *LowerBound,

                                    Metadata *UpperBound, Metadata *Stride);

    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)

    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.

    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.

    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.

    DILabel *

    createLabel(DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,

                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.

    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.

    DIExpression *createExpression(ArrayRef<uint64_t> Addr = std::nullopt);

    /// 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.

    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 = "");

    /// Identical to createFunction,

    /// except that the resulting DbgNode is meant to be RAUWed.

    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.

    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);

    /// 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.

    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.

    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.

    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.

    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.

    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.

    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.

    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.

    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.