llvm::dwarf_linker::AddressesMap Class Reference

AddressesMap represents information about valid addresses used by debug information. More...

#include "llvm/DWARFLinker/AddressesMap.h"

Public Member Functions
virtual	~AddressesMap ()=default
virtual bool	hasValidRelocs ()=0
	Checks that there are valid relocations in the .debug_info section.
virtual std::optional< int64_t >	getExprOpAddressRelocAdjustment (DWARFUnit &U, const DWARFExpression::Operation &Op, uint64_t StartOffset, uint64_t EndOffset, bool Verbose)=0
	Checks that the specified DWARF expression operand Op references live code section and returns the relocation adjustment value (to get the linked address this value might be added to the source expression operand address).
virtual std::optional< int64_t >	getSubprogramRelocAdjustment (const DWARFDie &DIE, bool Verbose)=0
	Checks that the specified subprogram DIE references the live code section and returns the relocation adjustment value (to get the linked address this value might be added to the source subprogram address).
virtual std::optional< StringRef >	getLibraryInstallName ()=0
virtual bool	applyValidRelocs (MutableArrayRef< char > Data, uint64_t BaseOffset, bool IsLittleEndian)=0
	Apply the valid relocations to the buffer Data, taking into account that Data is at BaseOffset in the .debug_info section.
virtual bool	needToSaveValidRelocs ()=0
	Check if the linker needs to gather and save relocation info.
virtual void	updateAndSaveValidRelocs (bool IsDWARF5, uint64_t OriginalUnitOffset, int64_t LinkedOffset, uint64_t StartOffset, uint64_t EndOffset)=0
	Update and save relocation values to be serialized.
virtual void	updateRelocationsWithUnitOffset (uint64_t OriginalUnitOffset, uint64_t OutputUnitOffset)=0
	Update the valid relocations that used OriginalUnitOffset as the compile unit offset, and update their values to reflect OutputUnitOffset.
virtual void	clear ()=0
	Erases all data.
std::pair< bool, std::optional< int64_t > >	getVariableRelocAdjustment (const DWARFDie &DIE, bool Verbose)
	This function checks whether variable has DWARF expression containing operation referencing live address(f.e.

Protected Member Functions
bool	isTlsAddressCode (uint8_t DW_OP_Code)

Detailed Description

AddressesMap represents information about valid addresses used by debug information.

Valid addresses are those which points to live code sections. i.e. relocations for these addresses point into sections which would be/are placed into resulting binary.

Definition at line 30 of file AddressesMap.h.

Constructor & Destructor Documentation

~AddressesMap()

virtual llvm::dwarf_linker::AddressesMap::~AddressesMap ( )

virtualdefault

Member Function Documentation

applyValidRelocs()

virtual bool llvm::dwarf_linker::AddressesMap::applyValidRelocs ( MutableArrayRef< char >  Data, uint64_t  BaseOffset, bool  IsLittleEndian  )

pure virtual

Apply the valid relocations to the buffer Data, taking into account that Data is at BaseOffset in the .debug_info section.

Returns

true whether any reloc has been applied.

clear()

virtual void llvm::dwarf_linker::AddressesMap::clear ( )

pure virtual

Erases all data.

getExprOpAddressRelocAdjustment()

virtual std::optional< int64_t > llvm::dwarf_linker::AddressesMap::getExprOpAddressRelocAdjustment ( DWARFUnit &  U, const DWARFExpression::Operation &  Op, uint64_t  StartOffset, uint64_t  EndOffset, bool  Verbose  )

pure virtual

Checks that the specified DWARF expression operand Op references live code section and returns the relocation adjustment value (to get the linked address this value might be added to the source expression operand address).

Print debug output if Verbose is true.

Returns

relocation adjustment value or std::nullopt if there is no corresponding live address.

Referenced by getVariableRelocAdjustment().

getLibraryInstallName()

virtual std::optional< StringRef > llvm::dwarf_linker::AddressesMap::getLibraryInstallName ( )

pure virtual

getSubprogramRelocAdjustment()

virtual std::optional< int64_t > llvm::dwarf_linker::AddressesMap::getSubprogramRelocAdjustment ( const DWARFDie &  DIE, bool  Verbose  )

pure virtual

Checks that the specified subprogram DIE references the live code section and returns the relocation adjustment value (to get the linked address this value might be added to the source subprogram address).

Allowed kinds of input DIE: DW_TAG_subprogram, DW_TAG_label. Print debug output if Verbose is true.

Returns

relocation adjustment value or std::nullopt if there is no corresponding live address.

getVariableRelocAdjustment()

std::pair< bool, std::optional< int64_t > > llvm::dwarf_linker::AddressesMap::getVariableRelocAdjustment ( const DWARFDie &  DIE, bool  Verbose  )

inline

This function checks whether variable has DWARF expression containing operation referencing live address(f.e.

DW_OP_addr, DW_OP_addrx...).

Returns

first is true if the expression has an operation referencing an address. second is the relocation adjustment value if the live address is referenced.

Definition at line 93 of file AddressesMap.h.

References assert(), llvm::Data, llvm::DWARFExpression::Operation::getCode(), llvm::DWARFExpression::Operation::getEndOffset(), getExprOpAddressRelocAdjustment(), llvm::DIE::getOffset(), llvm::DWARFExpression::Operation::getRawOperand(), llvm::DIE::getTag(), isTlsAddressCode(), and llvm::Verbose.

hasValidRelocs()

virtual bool llvm::dwarf_linker::AddressesMap::hasValidRelocs ( )

pure virtual

Checks that there are valid relocations in the .debug_info section.

isTlsAddressCode()

bool llvm::dwarf_linker::AddressesMap::isTlsAddressCode ( uint8_t  DW_OP_Code )

inlineprotected

Definition at line 183 of file AddressesMap.h.

Referenced by getVariableRelocAdjustment().

needToSaveValidRelocs()

virtual bool llvm::dwarf_linker::AddressesMap::needToSaveValidRelocs ( )

pure virtual

Check if the linker needs to gather and save relocation info.

updateAndSaveValidRelocs()

virtual void llvm::dwarf_linker::AddressesMap::updateAndSaveValidRelocs ( bool  IsDWARF5, uint64_t  OriginalUnitOffset, int64_t  LinkedOffset, uint64_t  StartOffset, uint64_t  EndOffset  )

pure virtual

Update and save relocation values to be serialized.

updateRelocationsWithUnitOffset()

virtual void llvm::dwarf_linker::AddressesMap::updateRelocationsWithUnitOffset ( uint64_t  OriginalUnitOffset, uint64_t  OutputUnitOffset  )

pure virtual

Update the valid relocations that used OriginalUnitOffset as the compile unit offset, and update their values to reflect OutputUnitOffset.

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The documentation for this class was generated from the following file:

• include/llvm/DWARFLinker/AddressesMap.h