Subprogram description. Uses SubclassData1. More...

#include "llvm/IR/DebugInfoMetadata.h"

Inheritance diagram for llvm::DISubprogram:

Public Types
enum	DISPFlags : uint32_t { SPFlagNonvirtual = SPFlagZero , SPFlagVirtuality = SPFlagVirtual \| SPFlagPureVirtual }
	Debug info subprogram flags. More...
Public Types inherited from llvm::DINode
enum	DIFlags : uint32_t { FlagAccessibility = FlagPrivate \| FlagProtected \| FlagPublic , FlagPtrToMemberRep }
	Debug info flags. More...
Public Types inherited from llvm::MDNode
using	op_iterator = const MDOperand *
using	op_range = iterator_range<op_iterator>
Public Types inherited from llvm::Metadata
enum	MetadataKind

Public Member Functions
	DEFINE_MDNODE_GET (DISubprogram,(DIScope Scope, StringRef Name, StringRef LinkageName, DIFile File, unsigned Line, DISubroutineType Type, unsigned ScopeLine, DIType ContainingType, unsigned VirtualIndex, int ThisAdjustment, DIFlags Flags, DISPFlags SPFlags, DICompileUnit Unit, DITemplateParameterArray TemplateParams=nullptr, DISubprogram Declaration=nullptr, DINodeArray RetainedNodes=nullptr, DITypeArray ThrownTypes=nullptr, DINodeArray Annotations=nullptr, StringRef TargetFuncName="", bool UsesKeyInstructions=false),(Scope, Name, LinkageName, File, Line, Type, ScopeLine, ContainingType, VirtualIndex, ThisAdjustment, Flags, SPFlags, Unit, TemplateParams, Declaration, RetainedNodes, ThrownTypes, Annotations, TargetFuncName, UsesKeyInstructions)) DEFINE_MDNODE_GET(DISubprogram
template<typename FuncLVT, typename FuncLabelT, typename FuncImportedEntityT, typename FuncTypeT>
void	forEachRetainedNode (FuncLVT &&FuncLV, FuncLabelT &&FuncLabel, FuncImportedEntityT &&FuncIE, FuncTypeT &&FuncType)
	For each retained node, applies one of the given functions depending on the type of a node.
void	cleanupRetainedNodes ()
	When IR modules are merged, typically during LTO, the merged module may contain several types having the same linkageName.
LLVM_ABI bool	describes (const Function *F) const
	Check if this subprogram describes the given function.
Public Member Functions inherited from llvm::DILocalScope
LLVM_ABI DISubprogram *	getSubprogram () const
	Get the subprogram for this scope.
LLVM_ABI DILocalScope *	getNonLexicalBlockFileScope () const
	Get the first non DILexicalBlockFile scope of this scope.
Public Member Functions inherited from llvm::DIScope
DIFile *	getFile () const
StringRef	getFilename () const
StringRef	getDirectory () const
std::optional< StringRef >	getSource () const
LLVM_ABI StringRef	getName () const
LLVM_ABI DIScope *	getScope () const
Metadata *	getRawFile () const
	Return the raw underlying file.
Public Member Functions inherited from llvm::DINode
LLVM_ABI dwarf::Tag	getTag () const
Public Member Functions inherited from llvm::MDNode
	MDNode (const MDNode &)=delete
void	operator= (const MDNode &)=delete
void *	operator new (size_t)=delete
LLVM_ABI TempMDNode	clone () const
	Create a (temporary) clone of this.
LLVMContext &	getContext () const
LLVM_ABI void	replaceOperandWith (unsigned I, Metadata *New)
	Replace a specific operand.
bool	isResolved () const
	Check if node is fully resolved.
bool	isUniqued () const
bool	isDistinct () const
bool	isTemporary () const
bool	isReplaceable () const
bool	isAlwaysReplaceable () const
bool	hasGeneralizedMDString ()
	Check if this is a valid generalized type metadata node.
unsigned	getNumTemporaryUses () const
void	replaceAllUsesWith (Metadata *MD)
	RAUW a temporary.
LLVM_ABI void	resolveCycles ()
	Resolve cycles.
LLVM_ABI void	resolve ()
	Resolve a unique, unresolved node.
op_iterator	op_begin () const
op_iterator	op_end () const
ArrayRef< MDOperand >	operands () const
const MDOperand &	getOperand (unsigned I) const
unsigned	getNumOperands () const
	Return number of MDNode operands.
LLVM_ABI bool	isTBAAVtableAccess () const
	Check whether MDNode is a vtable access.
LLVM_ABI void	printTree (raw_ostream &OS, const Module *M=nullptr) const
	Print in tree shape.
LLVM_ABI void	printTree (raw_ostream &OS, ModuleSlotTracker &MST, const Module *M=nullptr) const
LLVM_ABI void	dumpTree () const
	User-friendly dump in tree shape.
LLVM_ABI void	dumpTree (const Module *M) const
Public Member Functions inherited from llvm::Metadata
unsigned	getMetadataID () const
LLVM_ABI void	dump () const
	User-friendly dump.
LLVM_ABI void	dump (const Module *M) const
LLVM_ABI void	print (raw_ostream &OS, const Module *M=nullptr, bool IsForDebug=false) const
	Print.
LLVM_ABI void	print (raw_ostream &OS, ModuleSlotTracker &MST, const Module *M=nullptr, bool IsForDebug=false) const
LLVM_ABI void	printAsOperand (raw_ostream &OS, const Module *M=nullptr) const
	Print as operand.
LLVM_ABI void	printAsOperand (raw_ostream &OS, ModuleSlotTracker &MST, const Module *M=nullptr) const

Static Public Member Functions
static LLVM_ABI DISPFlags	getFlag (StringRef Flag)
static LLVM_ABI StringRef	getFlagString (DISPFlags Flag)
static LLVM_ABI DISPFlags	splitFlags (DISPFlags Flags, SmallVectorImpl< DISPFlags > &SplitFlags)
	Split up a flags bitfield for easier printing.
static LLVM_ABI DISPFlags	toSPFlags (bool IsLocalToUnit, bool IsDefinition, bool IsOptimized, unsigned Virtuality=SPFlagNonvirtual, bool IsMainSubprogram=false)
static DILocalScope *	getRetainedNodeScope (MDNode *N)
static const DIScope *	getRawRetainedNodeScope (const MDNode *N)
static DIScope *	getRawRetainedNodeScope (MDNode *N)
template<typename RangeT>
static void	cleanupRetainedNodes (const RangeT &NewDistinctSPs)
	Calls SP->cleanupRetainedNodes() for a range of DISubprograms.
static bool	classof (const Metadata *MD)
Static Public Member Functions inherited from llvm::DILocalScope
static LLVM_ABI DILocalScope *	cloneScopeForSubprogram (DILocalScope &RootScope, DISubprogram &NewSP, LLVMContext &Ctx, DenseMap< const MDNode , MDNode > &Cache)
	Traverses the scope chain rooted at RootScope until it hits a Subprogram, recreating the chain with "NewSP" instead.
static bool	classof (const Metadata *MD)
Static Public Member Functions inherited from llvm::DIScope
static bool	classof (const Metadata *MD)
Static Public Member Functions inherited from llvm::DINode
static LLVM_ABI DIFlags	getFlag (StringRef Flag)
static LLVM_ABI StringRef	getFlagString (DIFlags Flag)
static LLVM_ABI DIFlags	splitFlags (DIFlags Flags, SmallVectorImpl< DIFlags > &SplitFlags)
	Split up a flags bitfield.
static bool	classof (const Metadata *MD)
Static Public Member Functions inherited from llvm::MDNode
static MDTuple *	get (LLVMContext &Context, ArrayRef< Metadata * > MDs)
static MDTuple *	getIfExists (LLVMContext &Context, ArrayRef< Metadata * > MDs)
static MDTuple *	getDistinct (LLVMContext &Context, ArrayRef< Metadata * > MDs)
static TempMDTuple	getTemporary (LLVMContext &Context, ArrayRef< Metadata * > MDs)
static LLVM_ABI void	deleteTemporary (MDNode *N)
	Deallocate a node created by getTemporary.
template<class T>
static std::enable_if_t< std::is_base_of< MDNode, T >::value, T * >	replaceWithPermanent (std::unique_ptr< T, TempMDNodeDeleter > N)
	Replace a temporary node with a permanent one.
template<class T>
static std::enable_if_t< std::is_base_of< MDNode, T >::value, T * >	replaceWithUniqued (std::unique_ptr< T, TempMDNodeDeleter > N)
	Replace a temporary node with a uniqued one.
template<class T>
static std::enable_if_t< std::is_base_of< MDNode, T >::value, T * >	replaceWithDistinct (std::unique_ptr< T, TempMDNodeDeleter > N)
	Replace a temporary node with a distinct one.
static bool	classof (const Metadata *MD)
	Methods for support type inquiry through isa, cast, and dyn_cast:
static LLVM_ABI MDNode *	concatenate (MDNode A, MDNode B)
	Methods for metadata merging.
static LLVM_ABI MDNode *	intersect (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericTBAA (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericFPMath (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericRange (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericNoaliasAddrspace (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericAliasScope (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericAlignmentOrDereferenceable (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMostGenericNoFPClass (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMergedProfMetadata (MDNode A, MDNode B, const Instruction AInstr, const Instruction BInstr)
	Merge !prof metadata from two instructions.
static LLVM_ABI MDNode *	getMergedMemProfMetadata (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMergedCallsiteMetadata (MDNode A, MDNode B)
static LLVM_ABI MDNode *	getMergedCalleeTypeMetadata (const MDNode A, const MDNode B)
static LLVM_ABI CaptureComponents	toCaptureComponents (const MDNode *MD)
	Convert !captures metadata to CaptureComponents. MD may be nullptr.
static LLVM_ABI MDNode *	fromCaptureComponents (LLVMContext &Ctx, CaptureComponents CC)
	Convert CaptureComponents to !captures metadata.

Public Attributes
Metadata *	Scope
Metadata MDString *	Name
Metadata MDString MDString *	LinkageName
Metadata MDString MDString Metadata *	File
Metadata MDString MDString Metadata unsigned	Line
Metadata MDString MDString Metadata unsigned Metadata *	Type
Metadata MDString MDString Metadata unsigned Metadata unsigned	ScopeLine
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata *	ContainingType
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned	VirtualIndex
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int	ThisAdjustment
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags	Flags
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags	SPFlags
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata *	Unit
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata *	TemplateParams = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata *	Declaration = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata Metadata *	RetainedNodes = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata Metadata Metadata *	ThrownTypes = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata Metadata Metadata Metadata *	Annotations = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata Metadata Metadata Metadata MDString *	TargetFuncName = nullptr
Metadata MDString MDString Metadata unsigned Metadata unsigned Metadata unsigned int DIFlags DISPFlags Metadata Metadata Metadata Metadata Metadata Metadata MDString bool	UsesKeyInstructions

Friends
class	LLVMContextImpl
class	MDNode

Additional Inherited Members
Static Public Attributes inherited from llvm::Metadata
static constexpr const unsigned	PoisonGeneratingIDs []
	Metadata IDs that may generate poison.
Protected Types inherited from llvm::MDNode
using	mutable_op_range = iterator_range<MDOperand *>
Protected Types inherited from llvm::Metadata
enum	StorageType { Uniqued , Distinct , Temporary }
	Active type of storage. More...
Protected Member Functions inherited from llvm::DILocalScope
	DILocalScope (LLVMContext &C, unsigned ID, StorageType Storage, unsigned Tag, ArrayRef< Metadata * > Ops)
	~DILocalScope ()=default
Protected Member Functions inherited from llvm::DIScope
	DIScope (LLVMContext &C, unsigned ID, StorageType Storage, unsigned Tag, ArrayRef< Metadata * > Ops)
	~DIScope ()=default
Protected Member Functions inherited from llvm::DINode
	DINode (LLVMContext &C, unsigned ID, StorageType Storage, unsigned Tag, ArrayRef< Metadata * > Ops1, ArrayRef< Metadata * > Ops2={})
	~DINode ()=default
template<class Ty>
Ty *	getOperandAs (unsigned I) const
StringRef	getStringOperand (unsigned I) const
void	setTag (unsigned Tag)
	Allow subclasses to mutate the tag.
Protected Member Functions inherited from llvm::MDNode
LLVM_ABI	MDNode (LLVMContext &Context, unsigned ID, StorageType Storage, ArrayRef< Metadata * > Ops1, ArrayRef< Metadata * > Ops2={})
	~MDNode ()=default
LLVM_ABI void *	operator new (size_t Size, size_t NumOps, StorageType Storage)
LLVM_ABI void	operator delete (void *Mem)
void	operator delete (void *, unsigned)
	Required by std, but never called.
void	operator delete (void *, unsigned, bool)
	Required by std, but never called.
LLVM_ABI void	dropAllReferences ()
MDOperand *	mutable_begin ()
MDOperand *	mutable_end ()
mutable_op_range	mutable_operands ()
LLVM_ABI void	setOperand (unsigned I, Metadata *New)
	Set an operand.
unsigned	getNumUnresolved () const
void	setNumUnresolved (unsigned N)
LLVM_ABI void	storeDistinctInContext ()
void	resize (size_t NumOps)
	Resize the node to hold NumOps operands.
Protected Member Functions inherited from llvm::Metadata
	Metadata (unsigned ID, StorageType Storage)
	~Metadata ()=default
void	handleChangedOperand (void , Metadata )
	Default handling of a changed operand, which asserts.
Static Protected Member Functions inherited from llvm::DINode
static MDString *	getCanonicalMDString (LLVMContext &Context, StringRef S)
Static Protected Member Functions inherited from llvm::MDNode
template<class T, class StoreT>
static T *	storeImpl (T *N, StorageType Storage, StoreT &Store)
template<class T>
static T *	storeImpl (T *N, StorageType Storage)
Protected Attributes inherited from llvm::Metadata
unsigned char	Storage: 7
	Storage flag for non-uniqued, otherwise unowned, metadata.
unsigned char	SubclassData1: 1
unsigned short	SubclassData16 = 0
unsigned	SubclassData32 = 0

Detailed Description

Subprogram description. Uses SubclassData1.

Definition at line 2237 of file DebugInfoMetadata.h.

Member Enumeration Documentation

◆ DISPFlags

enum llvm::DISubprogram::DISPFlags : uint32_t

Debug info subprogram flags.

Enumerator
SPFlagNonvirtual
SPFlagVirtuality

Definition at line 2252 of file DebugInfoMetadata.h.

Member Function Documentation

◆ classof()

bool llvm::DISubprogram::classof ( const Metadata * MD )

inlinestatic

Definition at line 2589 of file DebugInfoMetadata.h.

References llvm::Metadata::getMetadataID().

◆ cleanupRetainedNodes() [1/2]

void DISubprogram::cleanupRetainedNodes ( )

When IR modules are merged, typically during LTO, the merged module may contain several types having the same linkageName.

They are supposed to represent the same type included by multiple source code files from a single header file.

DebugTypeODRUniquing feature uniques (deduplicates) such types based on their linkageName during metadata loading, to speed up compilation and reduce debug info size.

However, since function-local types are tracked in DISubprogram's retainedNodes field, a single local type may be referenced by multiple DISubprograms via retainedNodes as the result of DebugTypeODRUniquing. But retainedNodes field of a DISubprogram is meant to hold only subprogram's own local entities, therefore such references may cause crashes.

To address this problem, this method is called for each new subprogram after module loading. It removes references to types belonging to other DISubprograms from a subprogram's retainedNodes list. If a corresponding IR function refers to local scopes from another subprogram, emitted debug info (e.g. DWARF) should rely on cross-subprogram references (and cross-CU references, as subprograms may belong to different compile units). This is also a drawback: when a subprogram refers to types that are local to another subprogram, it is more complicated for debugger to properly discover local types of a current scope for expression evaluation.

Definition at line 1473 of file DebugInfoMetadata.cpp.

References llvm::cast(), llvm::cast_or_null(), llvm::dyn_cast_or_null(), llvm::MDNode::get(), llvm::MDNode::getContext(), llvm::isa(), llvm::isa_and_present(), N, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorImpl< T >::reserve(), RetainedNodes, llvm::SmallVectorTemplateCommon< T, typename >::size(), and T.

◆ cleanupRetainedNodes() [2/2]

template<typename RangeT>

void llvm::DISubprogram::cleanupRetainedNodes ( const RangeT & NewDistinctSPs )

inlinestatic

Calls SP->cleanupRetainedNodes() for a range of DISubprograms.

Definition at line 2579 of file DebugInfoMetadata.h.

◆ DEFINE_MDNODE_GET()

llvm::DISubprogram::DEFINE_MDNODE_GET	(	DISubprogram	,
		(DIScope Scope, StringRef Name, StringRef LinkageName, DIFile File, unsigned Line, DISubroutineType Type, unsigned ScopeLine, DIType ContainingType, unsigned VirtualIndex, int ThisAdjustment, DIFlags Flags, DISPFlags SPFlags, DICompileUnit Unit, DITemplateParameterArray TemplateParams=nullptr, DISubprogram Declaration=nullptr, DINodeArray RetainedNodes=nullptr, DITypeArray ThrownTypes=nullptr, DINodeArray Annotations=nullptr, StringRef TargetFuncName="", bool UsesKeyInstructions=false)	,
		(Scope, Name, LinkageName, File, Line, Type, ScopeLine, ContainingType, VirtualIndex, ThisAdjustment, Flags, SPFlags, Unit, TemplateParams, Declaration, RetainedNodes, ThrownTypes, Annotations, TargetFuncName, UsesKeyInstructions)	)

References Annotations, ContainingType, Declaration, File, LinkageName, Name, RetainedNodes, Scope, TargetFuncName, TemplateParams, ThrownTypes, Type, Unit, and UsesKeyInstructions.

◆ describes()

bool DISubprogram::describes ( const Function * F ) const

Check if this subprogram describes the given function.

FIXME: Should this be looking through bitcasts?

Definition at line 1443 of file DebugInfoMetadata.cpp.

References assert(), and F.

◆ forEachRetainedNode()

template<typename FuncLVT, typename FuncLabelT, typename FuncImportedEntityT, typename FuncTypeT>

void llvm::DISubprogram::forEachRetainedNode	(	FuncLVT &&	FuncLV,
		FuncLabelT &&	FuncLabel,
		FuncImportedEntityT &&	FuncIE,
		FuncTypeT &&	FuncType )

inline

For each retained node, applies one of the given functions depending on the type of a node.

Definition at line 2541 of file DebugInfoMetadata.h.

References llvm_unreachable, MDNode, and N.

◆ getFlag()

DISubprogram::DISPFlags DISubprogram::getFlag ( StringRef Flag )

static

Definition at line 1366 of file DebugInfoMetadata.cpp.

References llvm::StringSwitch< T, R >::Default().

Referenced by llvm::LLParser::parseMDField().

◆ getFlagString()

StringRef DISubprogram::getFlagString ( DISPFlags Flag )

static

Definition at line 1373 of file DebugInfoMetadata.cpp.

References SPFlagVirtuality.

◆ getRawRetainedNodeScope() [1/2]

const DIScope * DISubprogram::getRawRetainedNodeScope ( const MDNode * N )

static

Definition at line 1457 of file DebugInfoMetadata.cpp.

References getRawRetainedNodeScopeInternal(), MDNode, and N.

Referenced by llvm::DIBuilder::finalizeSubprogram(), and getRetainedNodeScope().

◆ getRawRetainedNodeScope() [2/2]

DIScope * DISubprogram::getRawRetainedNodeScope ( MDNode * N )

static

Definition at line 1461 of file DebugInfoMetadata.cpp.

References getRawRetainedNodeScopeInternal(), MDNode, and N.

◆ getRetainedNodeScope()

DILocalScope * DISubprogram::getRetainedNodeScope ( MDNode * N )

static

Definition at line 1465 of file DebugInfoMetadata.cpp.

References llvm::cast(), llvm::DILocalScope::DILocalScope(), getRawRetainedNodeScope(), MDNode, and N.

Referenced by getRetainedNodeScope().

◆ splitFlags()

DISubprogram::DISPFlags DISubprogram::splitFlags	(	DISPFlags	Flags,
		SmallVectorImpl< DISPFlags > &	SplitFlags )

static

Split up a flags bitfield for easier printing.

Split Flags into SplitFlags, a vector of its components. Returns any remaining (unrecognized) bits.

Definition at line 1387 of file DebugInfoMetadata.cpp.

◆ toSPFlags()

DISubprogram::DISPFlags DISubprogram::toSPFlags	(	bool	IsLocalToUnit,
		bool	IsDefinition,
		bool	IsOptimized,
		unsigned	Virtuality = SPFlagNonvirtual,
		bool	IsMainSubprogram = false )