Struct wasmtime_environ::wasmparser::types::ComponentInstanceType

pub struct ComponentInstanceType {
    pub exports: IndexMap<String, ComponentEntityType>,
    pub defined_resources: Vec<ResourceId>,
    pub explicit_resources: IndexMap<ResourceId, Vec<usize>>,
    /* private fields */
}

Represents a type of a component instance.

Fields

exports: IndexMap<String, ComponentEntityType>

The list of exports, keyed by name, that this instance has.

An optional URL and type of each export is provided as well.

defined_resources: Vec<ResourceId>

The list of “defined resources” or those which are closed over in this instance type.

This list is populated, for example, when the type of an instance is declared and it contains its own resource type exports defined internally. For example:

(component
    (type (instance
        (export "x" (type sub resource)) ;; one `defined_resources` entry
    ))
)

This list is also a bit of an oddity, however, because the type of a concrete instance will always have this as empty. For example:

(component
    (type $t (instance (export "x" (type sub resource))))

    ;; the type of this instance has no defined resources
    (import "i" (instance (type $t)))
)

This list ends up only being populated for instance types declared in a module which aren’t yet “attached” to anything. Once something is instantiated, imported, exported, or otherwise refers to a concrete instance then this list is always empty. For concrete instances defined resources are tracked in the component state or component type.

explicit_resources: IndexMap<ResourceId, Vec<usize>>

The list of all resources that are explicitly exported from this instance type along with the path they’re exported at.

Trait Implementations

impl Clone for ComponentInstanceType

fn clone(&self) -> ComponentInstanceType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ComponentInstanceType

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

Formats the value using the given formatter.

impl TypeData for ComponentInstanceType

type Id = ComponentInstanceTypeId

The identifier for this type data.