Struct gimli::read::cfi::UnwindContext

pub struct UnwindContext<T, S = StoreOnHeap>
where
    T: ReaderOffset,
    S: UnwindContextStorage<T>,
{
    stack: ArrayVec<S::Stack>,
    initial_rule: Option<(Register, RegisterRule<T>)>,
    is_initialized: bool,
}

Common context needed when evaluating the call frame unwinding information.

By default, this structure is small and allocates its internal storage on the heap using Box during UnwindContext::new.

This can be overridden by providing a custom UnwindContextStorage type parameter. When using a custom storage with in-line arrays, the UnwindContext type itself will be big, so in that case it’s recommended to place UnwindContext on the heap, e.g. using Box::new(UnwindContext::<R, MyCustomStorage>::new_in()).

To avoid re-allocating the context multiple times when evaluating multiple CFI programs, the same UnwindContext can be reused for multiple unwinds.

use gimli::{UnwindContext, UnwindTable};

// An uninitialized context.
let mut ctx = UnwindContext::new();

// Initialize the context by evaluating the CIE's initial instruction program,
// and generate the unwind table.
let mut table = some_fde.rows(&eh_frame, &bases, &mut ctx)?;
while let Some(row) = table.next_row()? {
    // Do stuff with each row...
}

Fields

stack: ArrayVec<S::Stack>

initial_rule: Option<(Register, RegisterRule<T>)>

is_initialized: bool

Implementations

impl<T: ReaderOffset> UnwindContext<T>

pub fn new() -> Self

Construct a new call frame unwinding context.

impl<T, S> UnwindContext<T, S>

where T: ReaderOffset, S: UnwindContextStorage<T>,

Signal Safe Methods

These methods are guaranteed not to allocate, acquire locks, or perform any other signal-unsafe operations, if an non-allocating storage is used.

pub fn new_in() -> Self

Construct a new call frame unwinding context.

fn initialize<Section, R>( &mut self, section: &Section, bases: &BaseAddresses, cie: &CommonInformationEntry<R>, ) -> Result<()>

where R: Reader<Offset = T>, Section: UnwindSection<R>,

Run the CIE’s initial instructions and initialize this UnwindContext.

fn reset(&mut self)

fn row(&self) -> &UnwindTableRow<T, S>

fn row_mut(&mut self) -> &mut UnwindTableRow<T, S>

fn save_initial_rules(&mut self) -> Result<()>

fn start_address(&self) -> u64

fn set_start_address(&mut self, start_address: u64)

fn set_register_rule( &mut self, register: Register, rule: RegisterRule<T>, ) -> Result<()>

fn get_initial_rule(&self, register: Register) -> Option<RegisterRule<T>>

Returns None if we have not completed evaluation of a CIE’s initial instructions.

fn set_cfa(&mut self, cfa: CfaRule<T>)

fn cfa_mut(&mut self) -> &mut CfaRule<T>

fn push_row(&mut self) -> Result<()>

fn pop_row(&mut self) -> Result<()>

Trait Implementations

impl<T, S> Clone for UnwindContext<T, S>

where T: ReaderOffset + Clone, S: UnwindContextStorage<T> + Clone, S::Stack: Clone,

fn clone(&self) -> UnwindContext<T, S>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T, S> Debug for UnwindContext<T, S>

where T: ReaderOffset, S: UnwindContextStorage<T>,

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

Formats the value using the given formatter.

impl<T, S> Default for UnwindContext<T, S>

where T: ReaderOffset, S: UnwindContextStorage<T>,

fn default() -> Self

Returns the “default value” for a type.

impl<T, S> PartialEq for UnwindContext<T, S>

where T: ReaderOffset + PartialEq, S: UnwindContextStorage<T> + PartialEq, S::Stack: PartialEq,

fn eq(&self, other: &UnwindContext<T, S>) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

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

impl<T, S> Eq for UnwindContext<T, S>

where T: ReaderOffset + Eq, S: UnwindContextStorage<T> + Eq, S::Stack: Eq,

impl<T, S> StructuralPartialEq for UnwindContext<T, S>

where T: ReaderOffset, S: UnwindContextStorage<T>,