Struct wasmtime_environ::wasmparser::types::ComponentType

pub struct ComponentType {
    pub imports: IndexMap<String, ComponentEntityType>,
    pub exports: IndexMap<String, ComponentEntityType>,
    pub imported_resources: Vec<(ResourceId, Vec<usize>)>,
    pub defined_resources: Vec<(ResourceId, Vec<usize>)>,
    pub explicit_resources: IndexMap<ResourceId, Vec<usize>>,
    /* private fields */
}

Represents a type of a component.

Fields

imports: IndexMap<String, ComponentEntityType>

The imports of the component type.

Each import has its own kebab-name and an optional URL listed. Note that the set of import names is disjoint with the set of export names.

exports: IndexMap<String, ComponentEntityType>

The exports of the component type.

Each export has its own kebab-name and an optional URL listed. Note that the set of export names is disjoint with the set of import names.

imported_resources: Vec<(ResourceId, Vec<usize>)>

Universally quantified resources required to be provided when instantiating this component type.

Each resource in this map is explicitly imported somewhere in the imports map. The “path” to where it’s imported is specified by the Vec<usize> payload here. For more information about the indexes see the documentation on ComponentState::imported_resources.

This should technically be inferrable from the structure of imports, but it’s stored as an auxiliary set for subtype checking and instantiation.

Note that this is not a set of all resources referred to by the imports. Instead it’s only those created, relative to the internals of this component, by the imports.

defined_resources: Vec<(ResourceId, Vec<usize>)>

The dual of the imported_resources, or the set of defined resources – those created through the instantiation process which are unique to this component.

This set is similar to the imported_resources set but it’s those contained within the exports. Instantiating this component will create fresh new versions of all of these resources. The path here is within the exports array.

explicit_resources: IndexMap<ResourceId, Vec<usize>>

The set of all resources which are explicitly exported by this component, and where they’re exported.

This mapping is stored separately from defined_resources to ensure that it contains all exported resources, not just those which are defined. That means that this can cover reexports of imported resources, exports of local resources, or exports of closed-over resources for example.

Trait Implementations

impl Clone for ComponentType

fn clone(&self) -> ComponentType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ComponentType

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

Formats the value using the given formatter.

impl TypeData for ComponentType

type Id = ComponentTypeId

The identifier for this type data.