Struct wasmedge_sys::frame::CallingFrame

pub struct CallingFrame { /* private fields */ }

Represents a calling frame on top of stack.

Implementations

impl CallingFrame

pub fn executor_mut(&self) -> Option<Executor>

Returns the executor instance from this calling frame.

pub fn module_instance(&self) -> Option<Instance>

Returns the module instance in this calling frame.

If the executing function instance is a host function and not added into any module instance, then returns None.

When a wasm function is executing and trying to call a host function inside, a frame with the module instance the wasm function belongs to will be pushed onto the stack. And therefore the calling frame context will record that module instance.

pub fn memory_mut(&self, idx: u32) -> Option<Memory>

Returns the memory instance by the given index from the module instance of the current calling frame. If the memory instance is not found, returns None.

By default, a WASM module has only one memory instance after instantiation. Therefore, users can pass in 0 as the index to get the memory instance in host function body. When the MultiMemories config option is enabled, there would be more than one memory instances in the wasm module. Users can retrieve the target memory instance by specifying the index of the memory instance in the wasm module instance.

Arguments

• idx - The index of the memory instance.

pub fn as_ptr(&self) -> *const WasmEdge_CallingFrameContext

Provides a raw pointer to the inner CallingFrame context.

Trait Implementations

impl Debug for CallingFrame

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

Formats the value using the given formatter.

impl Drop for CallingFrame

fn drop(&mut self)

Executes the destructor for this type.