Enum witnext::CallMode

pub enum CallMode {
    DefinedExport,
    DeclaredExport,
    DefinedImport,
    DeclaredImport,
}

Modes of calling a WebAssembly or host function.

Each mode may have a slightly different codegen for some types, so Function::call takes this as a parameter to know in what context the invocation is happening within.

Variants

DefinedExport

A defined export is being called.

This typically means that a code generator is generating a shim function to get exported from a WebAssembly module and the shim is calling a native language function defined within the wasm module. In this mode arguments are being lifted from wasm types to interface types, and results are being lowered.

DeclaredExport

A declared export is being called.

This typically means that a code generator is generating calls to a WebAssembly module, for example a JS host calling a WebAssembly instance. In this mode the native language’s arguments are being lowered to wasm values and the results of the function are lifted back into the native language.

DefinedImport

A defined import is being called.

This is typically used for code generators that are creating bindings in a host for a function imported by WebAssembly. In this mode a function with a wasm signature is generated and that function’s wasm arguments are lifted into the native language’s arguments. The results are then lowered back into wasm arguments to return.

DeclaredImport

A declared import is being called

This is typically used for code generators that are calling an imported function from within a wasm module. In this mode native language arguments are lowered to wasm values, and the results of the import are lifted back into the native language.

Implementations

impl CallMode

pub fn export(&self) -> bool

pub fn defined(&self) -> bool

Trait Implementations

impl Clone for CallMode

fn clone(&self) -> CallMode

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CallMode

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

Formats the value using the given formatter.

impl PartialEq<CallMode> for CallMode

fn eq(&self, other: &CallMode) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Copy for CallMode

impl StructuralPartialEq for CallMode