LLVM: llvm::dwarf::UnwindRow Class Reference (original) (raw)

A class that represents a single row in the unwind table that is decoded by parsing the DWARF Call Frame Information opcodes. More...

#include "[llvm/DebugInfo/DWARF/LowLevel/DWARFUnwindTable.h](DWARFUnwindTable%5F8h%5Fsource.html)"

Public Member Functions
	UnwindRow ()
bool	hasAddress () const
	Returns true if the address is valid in this object.
uint64_t	getAddress () const
	Get the address for this row.
void	setAddress (uint64_t Addr)
	Set the address for this UnwindRow.
void	slideAddress (uint64_t Offset)
	Offset the address for this UnwindRow.
UnwindLocation &	getCFAValue ()
const UnwindLocation &	getCFAValue () const
RegisterLocations &	getRegisterLocations ()
const RegisterLocations &	getRegisterLocations () const

A class that represents a single row in the unwind table that is decoded by parsing the DWARF Call Frame Information opcodes.

The row consists of an optional address, the rule to unwind the CFA and all rules to unwind any registers. If the address doesn't have a value, this row represents the initial instructions for a CIE. If the address has a value the UnwindRow represents a row in the UnwindTable for a FDE. The address is the first address for which the CFA location and register rules are valid within a function.

UnwindRow objects are created by parsing opcodes in the DWARF Call Frame Information and UnwindRow objects are lazily populated and pushed onto a stack in the UnwindTable when evaluating this state machine. Accessors are needed for the address, CFA value, and register locations as the opcodes encode a state machine that produces a sorted array of UnwindRow objects

◆ getAddress()

uint64_t llvm::dwarf::UnwindRow::getAddress ( ) const	inline

Get the address for this row.

Clients should only call this function after verifying it has a valid address with a call to

◆ getCFAValue() [1/2]

◆ getCFAValue() [2/2]

◆ getRegisterLocations() [1/2]

◆ getRegisterLocations() [2/2]

◆ hasAddress()

bool llvm::dwarf::UnwindRow::hasAddress ( ) const	inline

◆ setAddress()

void llvm::dwarf::UnwindRow::setAddress ( uint64_t Addr)	inline

◆ slideAddress()

void llvm::dwarf::UnwindRow::slideAddress ( uint64_t Offset)	inline

Offset the address for this UnwindRow.

The address represents the first address for which the CFAValue and RegLocs are valid within a function. Clients must ensure that this object already has an address (