Utility class that carries the DWARF compile/type unit and the debug info entry in an object. More...

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

Classes
class	attribute_iterator

class	iterator

Public Member Functions
	DWARFDie ()=default

	DWARFDie (DWARFUnit Unit, const DWARFDebugInfoEntry D)

bool	isValid () const

	operator bool () const

const DWARFDebugInfoEntry *	getDebugInfoEntry () const

DWARFUnit *	getDwarfUnit () const

const DWARFAbbreviationDeclaration *	getAbbreviationDeclarationPtr () const
	Get the abbreviation declaration for this DIE. More...

uint32_t	getOffset () const
	Get the absolute offset into the debug info or types section. More...

dwarf::Tag	getTag () const

bool	hasChildren () const

bool	isNULL () const
	Returns true for a valid DIE that terminates a sibling chain. More...

bool	isSubprogramDIE () const
	Returns true if DIE represents a subprogram (not inlined). More...

bool	isSubroutineDIE () const
	Returns true if DIE represents a subprogram or an inlined subroutine. More...

DWARFDie	getParent () const
	Get the parent of this DIE object. More...

DWARFDie	getSibling () const
	Get the sibling of this DIE object. More...

DWARFDie	getPreviousSibling () const
	Get the previous sibling of this DIE object. More...

DWARFDie	getFirstChild () const
	Get the first child of this DIE object. More...

DWARFDie	getLastChild () const
	Get the last child of this DIE object. More...

void	dump (raw_ostream &OS, unsigned indent=0, DIDumpOptions DumpOpts=DIDumpOptions()) const
	Dump the DIE and all of its attributes to the supplied stream. More...

LLVM_DUMP_METHOD void	dump () const
	Convenience zero-argument overload for debugging. More...

Optional< DWARFFormValue >	find (dwarf::Attribute Attr) const
	Extract the specified attribute from this DIE. More...

Optional< DWARFFormValue >	find (ArrayRef< dwarf::Attribute > Attrs) const
	Extract the first value of any attribute in Attrs from this DIE. More...

Optional< DWARFFormValue >	findRecursively (ArrayRef< dwarf::Attribute > Attrs) const
	Extract the first value of any attribute in Attrs from this DIE and recurse into any DW_AT_specification or DW_AT_abstract_origin referenced DIEs. More...

DWARFDie	getAttributeValueAsReferencedDie (dwarf::Attribute Attr) const
	Extract the specified attribute from this DIE as the referenced DIE. More...

DWARFDie	getAttributeValueAsReferencedDie (const DWARFFormValue &V) const

Optional< uint64_t >	getRangesBaseAttribute () const
	Extract the range base attribute from this DIE as absolute section offset. More...

Optional< uint64_t >	getHighPC (uint64_t LowPC) const
	Get the DW_AT_high_pc attribute value as an address. More...

bool	getLowAndHighPC (uint64_t &LowPC, uint64_t &HighPC, uint64_t &SectionIndex) const
	Retrieves DW_AT_low_pc and DW_AT_high_pc from CU. More...

Expected< DWARFAddressRangesVector >	getAddressRanges () const
	Get the address ranges for this DIE. More...

void	collectChildrenAddressRanges (DWARFAddressRangesVector &Ranges) const
	Get all address ranges for any DW_TAG_subprogram DIEs in this DIE or any of its children. More...

bool	addressRangeContainsAddress (const uint64_t Address) const

const char *	getSubroutineName (DINameKind Kind) const
	If a DIE represents a subprogram (or inlined subroutine), returns its mangled name (or short name, if mangled is missing). More...

const char *	getName (DINameKind Kind) const
	Return the DIE name resolving DW_AT_sepcification or DW_AT_abstract_origin references if necessary. More...

uint64_t	getDeclLine () const
	Returns the declaration line (start line) for a DIE, assuming it specifies a subprogram. More...

void	getCallerFrame (uint32_t &CallFile, uint32_t &CallLine, uint32_t &CallColumn, uint32_t &CallDiscriminator) const
	Retrieves values of DW_AT_call_file, DW_AT_call_line and DW_AT_call_column from DIE (or zeroes if they are missing). More...

iterator_range< attribute_iterator >	attributes () const
	Get an iterator range to all attributes in the current DIE only. More...

iterator	begin () const

iterator	end () const

std::reverse_iterator< iterator >	rbegin () const

std::reverse_iterator< iterator >	rend () const

iterator_range< iterator >	children () const

Detailed Description

Utility class that carries the DWARF compile/type unit and the debug info entry in an object.

When accessing information from a debug info entry we always need to DWARF compile/type unit in order to extract the info correctly as some information is relative to the compile/type unit. Prior to this class the DWARFUnit and the DWARFDebugInfoEntry was passed around separately and there was the possibility for error if the wrong DWARFUnit was used to extract a unit relative offset. This class helps to ensure that this doesn't happen and also simplifies the attribute extraction calls by not having to specify the DWARFUnit for each call.

Definition at line 43 of file DWARFDie.h.

Constructor & Destructor Documentation

◆ DWARFDie() [1/2]

llvm::DWARFDie::DWARFDie ( )

default

◆ DWARFDie() [2/2]

llvm::DWARFDie::DWARFDie	(	DWARFUnit *	Unit,
		const DWARFDebugInfoEntry *	D
	)

inline

Definition at line 49 of file DWARFDie.h.

Member Function Documentation

◆ addressRangeContainsAddress()

bool DWARFDie::addressRangeContainsAddress ( const uint64_t Address ) const

Definition at line 514 of file DWARFDie.cpp.

References llvm::consumeError().

Referenced by llvm::DWARFContext::getDIEsForAddress(), and isNULL().

◆ attributes()

iterator_range< DWARFDie::attribute_iterator > DWARFDie::attributes ( ) const

Get an iterator range to all attributes in the current DIE only.

Returns: an iterator range for the attributes of the current DIE.

Definition at line 665 of file DWARFDie.cpp.

References llvm::make_range().

Referenced by isNULL().

◆ begin()

DWARFDie::iterator llvm::DWARFDie::begin ( ) const

inline

Definition at line 375 of file DWARFDie.h.

References getFirstChild().

Referenced by children(), isNULL(), and rend().

◆ children()

iterator_range< DWARFDie::iterator > llvm::DWARFDie::children ( ) const

inline

Definition at line 383 of file DWARFDie.h.

References begin(), end(), and llvm::make_range().

Referenced by dumpArrayType(), dumpTypeName(), and isNULL().

◆ collectChildrenAddressRanges()

void DWARFDie::collectChildrenAddressRanges ( DWARFAddressRangesVector & Ranges ) const

Get all address ranges for any DW_TAG_subprogram DIEs in this DIE or any of its children.

Get the hi/low PC range if both attributes are available or exrtracts the non-contiguous address ranges from the DW_AT_ranges attribute for this DIE and all children.

Parameters

Ranges the addres range vector to fill in.

Definition at line 498 of file DWARFDie.cpp.

References llvm::children(), and llvm::consumeError().

Referenced by isNULL().

◆ dump() [1/2]

void DWARFDie::dump	(	raw_ostream &	OS,
		unsigned	indent = `0`,
		DIDumpOptions	DumpOpts = `DIDumpOptions()`
	)		const

Dump the DIE and all of its attributes to the supplied stream.

Parameters

OS	the stream to use for output.
indent	the number of characters to indent each line that is output.

Definition at line 571 of file DWARFDie.cpp.

References llvm::Address, dump(), dumpAttribute(), dumpParentChain(), llvm::format(), llvm::formatv(), llvm::WithColor::get(), llvm::getOffset(), getParent(), getSibling(), llvm::dwarf::getTag(), llvm::DataExtractor::getULEB128(), llvm::raw_ostream::indent(), llvm::DataExtractor::isValidOffset(), llvm::DIDumpOptions::RecurseDepth, llvm::DIDumpOptions::ShowAddresses, llvm::DIDumpOptions::ShowChildren, llvm::DIDumpOptions::ShowParents, llvm::Tag, and llvm::DIDumpOptions::Verbose.

Referenced by dump(), dumpParentChain(), llvm::DWARFVerifier::handleAccelTables(), and llvm::DWARFVerifier::handleDebugInfo().

◆ dump() [2/2]

LLVM_DUMP_METHOD void DWARFDie::dump ( ) const

Convenience zero-argument overload for debugging.

Definition at line 633 of file DWARFDie.cpp.

References llvm::dump(), and llvm::errs().

Referenced by isNULL().

◆ end()

DWARFDie::iterator llvm::DWARFDie::end ( ) const

inline

Definition at line 379 of file DWARFDie.h.

References getLastChild().

Referenced by children(), isNULL(), and rbegin().

◆ find() [1/2]

Optional< DWARFFormValue > DWARFDie::find ( dwarf::Attribute Attr ) const

Extract the specified attribute from this DIE.

Extract an attribute value from this DIE only. This call doesn't look for the attribute value in any DW_AT_specification or DW_AT_abstract_origin referenced DIEs.

Parameters

Attr	the attribute to extract.

Returns: an optional DWARFFormValue that will have the form value if the attribute was successfully extracted.

Definition at line 373 of file DWARFDie.cpp.

References llvm::getOffset(), and llvm::None.

Referenced by dumpArrayType(), findRecursively(), llvm::DWARFUnit::getBaseAddress(), llvm::DWARFUnit::getCompilationDir(), llvm::DWARFVerifier::handleDebugInfo(), isNULL(), and isVariableIndexable().

◆ find() [2/2]

Optional< DWARFFormValue > DWARFDie::find ( ArrayRef< dwarf::Attribute > Attrs ) const

Extract the first value of any attribute in Attrs from this DIE.

Extract the first attribute that matches from this DIE only. This call doesn't look for the attribute value in any DW_AT_specification or DW_AT_abstract_origin referenced DIEs. The attributes will be searched linearly in the order they are specified within Attrs.

Parameters

Attrs an array of DWARF attribute to look for.

Returns: an optional that has a valid DWARFFormValue for the first matching attribute in Attrs, or None if none of the attributes in Attrs exist in this DIE.

Definition at line 383 of file DWARFDie.cpp.

References llvm::getOffset(), and llvm::None.

◆ findRecursively()

Optional< DWARFFormValue > DWARFDie::findRecursively ( ArrayRef< dwarf::Attribute > Attrs ) const

Extract the first value of any attribute in Attrs from this DIE and recurse into any DW_AT_specification or DW_AT_abstract_origin referenced DIEs.

Parameters

Attrs an array of DWARF attribute to look for.

Returns: an optional that has a valid DWARFFormValue for the first matching attribute in Attrs, or None if none of the attributes in Attrs exist in this DIE or in any DW_AT_specification or DW_AT_abstract_origin DIEs.

Definition at line 397 of file DWARFDie.cpp.

References llvm::SmallSet< T, N, C >::count(), D, find(), getAttributeValueAsReferencedDie(), llvm::SmallSet< T, N, C >::insert(), isValid(), and llvm::None.

Referenced by isNULL(), and isVariableIndexable().

◆ getAbbreviationDeclarationPtr()

const DWARFAbbreviationDeclaration* llvm::DWARFDie::getAbbreviationDeclarationPtr ( ) const

inline

Get the abbreviation declaration for this DIE.

Returns: the abbreviation declaration or NULL for null tags.

Definition at line 59 of file DWARFDie.h.

References assert(), llvm::DWARFDebugInfoEntry::getAbbreviationDeclarationPtr(), and isValid().

Referenced by getTag(), isNULL(), and llvm::DWARFDie::attribute_iterator::operator++().

◆ getAddressRanges()

Expected< DWARFAddressRangesVector > DWARFDie::getAddressRanges ( ) const

Get the address ranges for this DIE.

Get the hi/low PC range if both attributes are available or exrtracts the non-contiguous address ranges from the DW_AT_ranges attribute.

Extracts the range information from this DIE only. This call doesn't look for the range in any DW_AT_specification or DW_AT_abstract_origin DIEs.

Returns: a address range vector that might be empty if no address range information is available.

Definition at line 481 of file DWARFDie.cpp.

References llvm::find(), llvm::DWARFFormValue::getAsSectionOffset(), and llvm::DWARFFormValue::getForm().

Referenced by llvm::DWARFUnit::collectAddressRanges(), dumpAttribute(), llvm::DWARFVerifier::handleDebugInfo(), isNULL(), and llvm::DWARFUnit::updateAddressDieMap().

◆ getAttributeValueAsReferencedDie() [1/2]

DWARFDie DWARFDie::getAttributeValueAsReferencedDie ( dwarf::Attribute Attr ) const

Extract the specified attribute from this DIE as the referenced DIE.

Regardless of the reference type, return the correct DWARFDie instance if the attribute exists. The returned DWARFDie object might be from another DWARFUnit, but that is all encapsulated in the new DWARFDie object.

Extract an attribute value from this DIE only. This call doesn't look for the attribute value in any DW_AT_specification or DW_AT_abstract_origin referenced DIEs.

Parameters

Attr	the attribute to extract.

Returns: a valid DWARFDie instance if the attribute exists, or an invalid DWARFDie object if it doesn't.

Definition at line 433 of file DWARFDie.cpp.

References F(), and llvm::find().

Referenced by dumpAttribute(), dumpTypeName(), findRecursively(), llvm::DWARFVerifier::handleDebugInfo(), and isNULL().

◆ getAttributeValueAsReferencedDie() [2/2]

DWARFDie DWARFDie::getAttributeValueAsReferencedDie ( const DWARFFormValue & V ) const

Definition at line 440 of file DWARFDie.cpp.

References llvm::dwarf::toReference().

◆ getCallerFrame()

void DWARFDie::getCallerFrame	(	uint32_t &	CallFile,
		uint32_t &	CallLine,
		uint32_t &	CallColumn,
		uint32_t &	CallDiscriminator
	)		const

Retrieves values of DW_AT_call_file, DW_AT_call_line and DW_AT_call_column from DIE (or zeroes if they are missing).

This function looks for DW_AT_call attributes in this DIE only, it will not resolve the attribute values in any DW_AT_specification or DW_AT_abstract_origin DIEs.

Parameters

CallFile	filled in with non-zero if successful, zero if there is no DW_AT_call_file attribute in this DIE.
CallLine	filled in with non-zero if successful, zero if there is no DW_AT_call_line attribute in this DIE.
CallColumn	filled in with non-zero if successful, zero if there is no DW_AT_call_column attribute in this DIE.
CallDiscriminator	filled in with non-zero if successful, zero if there is no DW_AT_GNU_discriminator attribute in this DIE.

Definition at line 552 of file DWARFDie.cpp.

References llvm::find(), and llvm::dwarf::toUnsigned().

Referenced by llvm::DWARFContext::getInliningInfoForAddress(), and isNULL().

◆ getDebugInfoEntry()

const DWARFDebugInfoEntry* llvm::DWARFDie::getDebugInfoEntry ( ) const

inline

Definition at line 53 of file DWARFDie.h.

Referenced by llvm::DWARFUnit::getDIEIndex(), and llvm::operator==().

◆ getDeclLine()

uint64_t DWARFDie::getDeclLine ( ) const

Returns the declaration line (start line) for a DIE, assuming it specifies a subprogram.

This may be fetched from specification or abstract origin for this subprogram by resolving DW_AT_sepcification or DW_AT_abstract_origin references if necessary.

Definition at line 548 of file DWARFDie.cpp.

References llvm::dwarf::toUnsigned().

Referenced by getFunctionNameAndStartLineForAddress(), llvm::DWARFContext::getInliningInfoForAddress(), and isNULL().

◆ getDwarfUnit()

DWARFUnit* llvm::DWARFDie::getDwarfUnit ( ) const

inline

Definition at line 54 of file DWARFDie.h.

Referenced by dumpArrayType(), dumpAttribute(), getNames(), llvm::DWARFVerifier::handleDebugInfo(), isVariableIndexable(), and llvm::operator==().

◆ getFirstChild()

DWARFDie DWARFDie::getFirstChild ( ) const

Get the first child of this DIE object.

Returns: a valid DWARFDie instance if this object has children or an invalid DWARFDie instance if it doesn't.

Definition at line 653 of file DWARFDie.cpp.

References getFirstChild().

Referenced by begin(), getFirstChild(), isNULL(), and llvm::DWARFUnit::updateAddressDieMap().

◆ getHighPC()

Optional< uint64_t > DWARFDie::getHighPC ( uint64_t LowPC ) const

Get the DW_AT_high_pc attribute value as an address.

In DWARF version 4 and later the high PC can be encoded as an offset from the DW_AT_low_pc. This function takes care of extracting the value as an address or offset and adds it to the low PC if needed and returns the value as an optional in case the DIE doesn't have a DW_AT_high_pc attribute.

Parameters

LowPC the low PC that might be needed to calculate the high PC.