Struct wasmedge_sys::Global

pub struct Global { /* private fields */ }

Defines a WebAssembly global variable, which stores a single value of the given type and a flag indicating whether it is mutable or not.

Implementations

impl Global

pub fn create(ty: &GlobalType, val: WasmValue) -> WasmEdgeResult<Self>

Creates a new Global instance to be associated with the given [GlobalType] and WasmValue.

The type of the given WasmValue must be matched with [GlobalType]; otherwise, it causes a failure. For example, WasmValue::I32(520) conflicts with a [GlobalType] with a value type defined as ValType::F32.

Errors

• If fail to create the Global instance, then WasmEdgeError::Global(GlobalError::Create)(crate::error::GlobalError) is returned.

pub fn ty(&self) -> WasmEdgeResult<GlobalType>

Returns the underlying wasm type of a Global instance.

Errors

If fail to get the type, then an error is returned.

pub fn get_value(&self) -> WasmValue

Returns the value of the Global instance.

pub fn set_value(&mut self, val: WasmValue) -> WasmEdgeResult<()>

Sets the value of the Global instance.

Notice that only the Global instance of Mutability::Var type can be set a new value. Setting a new value for a Global of Mutability::Const causes a failure.

Argument

• val - The new wasm value to be set.

Errors

If fail to set value, then an error is returned.

pub unsafe fn as_ptr(&self) -> *const WasmEdge_GlobalInstanceContext

Safety

The lifetime of the returned pointer must not exceed that of the object itself.

pub unsafe fn from_raw(ptr: *mut WasmEdge_GlobalInstanceContext) -> Self

Safety

This function takes ownership of ptr, so do not call ffi::WasmEdge_GlobalInstanceDelete on ptr after this.

Trait Implementations

impl Debug for Global

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

Formats the value using the given formatter.

impl Drop for Global

fn drop(&mut self)

Executes the destructor for this type.