Struct wasmtime_environ::wasm::wasmparser::BrTable

pub struct BrTable<'a> { /* fields omitted */ }

A br_table entries representation.

Implementations

impl<'a> BrTable<'a>

pub fn len(&self) -> usize

Returns the number of br_table entries, not including the default label

pub fn is_empty(&self) -> bool

Returns whether BrTable doesn’t have any labels apart from the default one.

pub fn targets(
    &'b self
) -> impl Iterator<Item = Result<(u32, bool), BinaryReaderError>> + 'b

Returns the list of targets that this br_table instruction will be jumping to.

This method will return an iterator which parses each target of this br_table as well as the default target. The returned iterator will yield self.len() + 1 elements.

Each iterator item is a tuple of (u32, bool), where the first item is the relative depth of the jump and the second item is true if the item is the default label. You’re guaranteed that true will only show up for the final element of the iterator.

#Examples

let buf = [0x0e, 0x02, 0x01, 0x02, 0x00];
let mut reader = wasmparser::BinaryReader::new(&buf);
let op = reader.read_operator().unwrap();
if let wasmparser::Operator::BrTable { table } = op {
    let targets = table.targets().collect::<Result<Vec<_>, _>>().unwrap();
    assert_eq!(targets, [(1, false), (2, false), (0, true)]);
}

Trait Implementations

impl<'a> Clone for BrTable<'a>

pub fn clone(&self) -> BrTable<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'_> Debug for BrTable<'_>

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

Formats the value using the given formatter.