Method parent

crates/wasmtime/src/runtime/debug.rs:459–487

Get a handle to the next frame up the activation (the one that called this frame), if any.

(&self, mut store: impl AsContextMut)

    /// Get a handle to the next frame up the activation (the one that
    /// called this frame), if any.
    pub fn parent(&self, mut store: impl AsContextMut) -> Result<Option<FrameHandle>> {
        let mut store = store.as_context_mut();
        if !self.is_valid(&mut store) {
            crate::error::bail!("Frame handle is no longer valid.");
        }

        let mut parent = self.clone();
        parent.virtual_frame_idx += 1;

        while !parent.cursor.done() {
            let (cache, registry) = store
                .0
                .as_store_opaque()
                .frame_data_cache_mut_and_registry();
            let frames = cache.lookup_or_compute(registry, parent.cursor.frame());
            if parent.virtual_frame_idx < frames.len() {
                return Ok(Some(parent));
            }
            parent.virtual_frame_idx = 0;
            // SAFETY: activation is valid because we checked validity
            // wrt execution version at the top of this function, and
            // we have not returned since.
            unsafe {
                parent.cursor.advance(store.0.as_store_opaque().unwinder());
            }
        }

        Ok(None)
    }

    fn frame_data<'a>(&self, store: &'a mut StoreOpaque) -> Result<&'a FrameData> {
        if !self.is_valid_impl(store) {