Struct FunctionType 

pub struct FunctionType { /* private fields */ }

Function types classify the signature of functions, mapping a vector of parameters to a vector of results. They are also used to classify the inputs and outputs of instructions

See https://webassembly.github.io/spec/core/syntax/types.html#function-types

Examples

Input & Output

use wasm_ast::{FunctionType, ResultType};

let function_type = FunctionType::new(ResultType::empty(), ResultType::empty());

assert!(function_type.parameters().is_empty());
assert!(function_type.results().is_empty());

Input Only

use wasm_ast::{FunctionType, ResultType, ValueType};

let function_type = FunctionType::side_effect(ResultType::from(vec![ValueType::I32]));

assert_eq!(function_type.parameters().kinds(), &[ValueType::I32]);
assert!(function_type.results().is_empty());

Output Only

use wasm_ast::{FunctionType, ResultType, ValueType};

let function_type = FunctionType::nullary(ResultType::from(vec![ValueType::I32]));

assert!(function_type.parameters().is_empty());
assert_eq!(function_type.results().kinds(), &[ValueType::I32]);

No Input or Output

use wasm_ast::{FunctionType, ResultType, ValueType};

let function_type = FunctionType::runnable();

assert!(function_type.parameters().is_empty());
assert!(function_type.results().is_empty());

Implementations

impl FunctionType

pub fn new(parameters: ResultType, results: ResultType) -> Self

Creates a new function signature with the given parameter and result types.

pub fn side_effect(parameters: ResultType) -> Self

Creates a new function signature with the given parameter types and no result types.

pub fn nullary(results: ResultType) -> Self

Creates a new function signature with the given result types and no parameter types.

pub fn runnable() -> Self

Creates a new function signature with the no parameter or result types.

pub fn parameters(&self) -> &ResultType

The parameter types of this FunctionType.

pub fn results(&self) -> &ResultType

The result types of this FunctionType.

Trait Implementations

impl Clone for FunctionType

fn clone(&self) -> FunctionType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionType

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

Formats the value using the given formatter.

impl PartialEq for FunctionType

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for FunctionType

impl StructuralPartialEq for FunctionType