Method exit_frame

crates/wasmtime/src/runtime/debug.rs:416–442

Create a new FrameHandle at the exit frame of an activation. # Safety The provided activation must be valid currently.

(store: &mut StoreOpaque, activation: Activation)

    ///
    /// The provided activation must be valid currently.
    unsafe fn exit_frame(store: &mut StoreOpaque, activation: Activation) -> Option<FrameHandle> {
        // SAFETY: activation is valid as per our safety condition.
        let mut cursor = unsafe { activation.cursor() };

        // Find the first virtual frame. Each physical frame may have
        // zero or more virtual frames.
        while !cursor.done() {
            let (cache, registry) = store.frame_data_cache_mut_and_registry();
            let frames = cache.lookup_or_compute(registry, cursor.frame());
            if frames.len() > 0 {
                return Some(FrameHandle {
                    cursor,
                    virtual_frame_idx: 0,
                    store_id: store.id(),
                    store_version: store.vm_store_context().execution_version,
                });
            }
            // SAFETY: activation is still valid (valid on entry per
            // our safety condition, and we have not returned control
            // since above).
            unsafe {
                cursor.advance(store.unwinder());
            }
        }

        None
    }

    /// Determine whether this handle can still be used to refer to a
    /// frame.