Struct wasmi::FuncInstance
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[src]
pub struct FuncInstance(_);
Runtime representation of a function.
Functions are the unit of orgianization of code in WebAssembly. Each function takes a sequence of values as parameters and either optionally return a value or trap. Functions can call other function including itself (i.e recursive calls are allowed) and imported functions (i.e functions defined in another module or by the host environment).
Functions can be defined either:
- by a wasm module,
- by the host environment and passed to a wasm module as an import.
See more in
Externals
.
Methods
impl FuncInstance
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pub fn alloc_host(signature: Signature, host_func_index: usize) -> FuncRef
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Allocate a function instance for a host function.
When this function instance will be called by the wasm code,
the instance of Externals
will be invoked by calling invoke_index
with specified host_func_index
here.
This call will be made with the signature
provided here.
pub fn signature(&self) -> &Signature
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Returns signature of this function instance.
This function instance can only be called with matching signatures.
pub fn invoke<E: Externals>(
func: &FuncRef,
args: &[RuntimeValue],
externals: &mut E
) -> Result<Option<RuntimeValue>, Trap>
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func: &FuncRef,
args: &[RuntimeValue],
externals: &mut E
) -> Result<Option<RuntimeValue>, Trap>