Struct DebugFrame

pub struct DebugFrame<R: Reader> { /* private fields */ }

DebugFrame contains the .debug_frame section’s frame unwinding information required to unwind to and recover registers from older frames on the stack. For example, this is useful for a debugger that wants to print locals in a backtrace.

Most interesting methods are defined in the UnwindSection trait.

Differences between .debug_frame and .eh_frame

While the .debug_frame section’s information has a lot of overlap with the .eh_frame section’s information, the .eh_frame information tends to only encode the subset of information needed for exception handling. Often, only one of .eh_frame or .debug_frame will be present in an object file.

Implementations

impl<R: Reader> DebugFrame<R>

pub fn set_address_size(&mut self, address_size: u8)

Set the size of a target address in bytes.

This defaults to the native word size. This is only used if the CIE version is less than 4.

pub fn set_vendor(&mut self, vendor: Vendor)

Set the vendor extensions to use.

This defaults to Vendor::Default.

impl<'input, Endian> DebugFrame<EndianSlice<'input, Endian>>

where Endian: Endianity,

pub fn new(section: &'input [u8], endian: Endian) -> Self

Construct a new DebugFrame instance from the data in the .debug_frame section.

It is the caller’s responsibility to read the section and present it as a &[u8] slice. That means using some ELF loader on Linux, a Mach-O loader on macOS, etc.

use gimli::{DebugFrame, NativeEndian};

// Use with `.debug_frame`
let debug_frame = DebugFrame::new(read_debug_frame_section_somehow(), NativeEndian);

Trait Implementations

impl<R: Clone + Reader> Clone for DebugFrame<R>

fn clone(&self) -> DebugFrame<R>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<R: Debug + Reader> Debug for DebugFrame<R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<R: Reader> From<R> for DebugFrame<R>

fn from(section: R) -> Self

Converts to this type from the input type.

impl<R: PartialEq + Reader> PartialEq for DebugFrame<R>

fn eq(&self, other: &DebugFrame<R>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<R: Reader> Section<R> for DebugFrame<R>

fn id() -> SectionId

Returns the section id for this type.

fn reader(&self) -> &R

Returns the Reader for this section.

fn section_name() -> &'static str

Returns the ELF section name for this type.

fn dwo_section_name() -> Option<&'static str>

Returns the ELF section name (if any) for this type when used in a dwo file.

fn xcoff_section_name() -> Option<&'static str>

Returns the XCOFF section name (if any) for this type when used in a XCOFF file.

fn load<F, E>(f: F) -> Result<Self, E>

where F: FnOnce(SectionId) -> Result<R, E>,

Try to load the section using the given loader function.

fn dwp_range(&self, offset: u32, size: u32) -> Result<Self>

where R: Reader,

Returns the subrange of the section that is the contribution of a unit in a .dwp file.

fn lookup_offset_id(&self, id: ReaderOffsetId) -> Option<(SectionId, R::Offset)>

where R: Reader,

Returns the Reader for this section.

impl<R: Reader> UnwindSection<R> for DebugFrame<R>

type Offset = DebugFrameOffset<<R as Reader>::Offset>

The offset type associated with this CFI section. Either DebugFrameOffset or EhFrameOffset.

fn entries<'bases>( &self, bases: &'bases BaseAddresses, ) -> CfiEntriesIter<'bases, Self, R>

Iterate over the CommonInformationEntrys and FrameDescriptionEntrys in this .debug_frame section.

fn cie_from_offset( &self, bases: &BaseAddresses, offset: Self::Offset, ) -> Result<CommonInformationEntry<R>>

Parse the CommonInformationEntry at the given offset.

fn partial_fde_from_offset<'bases>( &self, bases: &'bases BaseAddresses, offset: Self::Offset, ) -> Result<PartialFrameDescriptionEntry<'bases, Self, R>>

Parse the PartialFrameDescriptionEntry at the given offset.

fn fde_from_offset<F>( &self, bases: &BaseAddresses, offset: Self::Offset, get_cie: F, ) -> Result<FrameDescriptionEntry<R>>

where F: FnMut(&Self, &BaseAddresses, Self::Offset) -> Result<CommonInformationEntry<R>>,

Parse the FrameDescriptionEntry at the given offset.

fn fde_for_address<F>( &self, bases: &BaseAddresses, address: u64, get_cie: F, ) -> Result<FrameDescriptionEntry<R>>

where F: FnMut(&Self, &BaseAddresses, Self::Offset) -> Result<CommonInformationEntry<R>>,

Find the FrameDescriptionEntry for the given address.

fn unwind_info_for_address<'ctx, F, S>( &self, bases: &BaseAddresses, ctx: &'ctx mut UnwindContext<R::Offset, S>, address: u64, get_cie: F, ) -> Result<&'ctx UnwindTableRow<R::Offset, S>>

where F: FnMut(&Self, &BaseAddresses, Self::Offset) -> Result<CommonInformationEntry<R>>, S: UnwindContextStorage<R::Offset>,

Find the frame unwind information for the given address.

impl<R: Copy + Reader> Copy for DebugFrame<R>

impl<R: Eq + Reader> Eq for DebugFrame<R>

impl<R: Reader> StructuralPartialEq for DebugFrame<R>