cargo::core::resolver::features

# Struct FeatureResolver

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    pub struct FeatureResolver<'a, 'gctx> {
        ws: &'a Workspace<'gctx>,
        target_data: &'a mut RustcTargetData<'gctx>,
        requested_targets: &'a [CompileKind],
        resolve: &'a Resolve,
        package_set: &'a PackageSet<'gctx>,
        opts: FeatureOpts,
        activated_features: HashMap<(PackageId, FeaturesFor), BTreeSet<InternedString>>,
        activated_dependencies: HashMap<(PackageId, FeaturesFor), BTreeSet<InternedString>>,
        processed_deps: HashSet<(PackageId, FeaturesFor)>,
        track_for_host: bool,
        deferred_weak_dependencies: HashMap<(PackageId, FeaturesFor, InternedString), HashSet<InternedString>>,
    }

Expand description

The new feature resolver that `resolve`s your project.

For more information, please see the module-level documentation.

## Fields§

§`ws: &'a Workspace<'gctx>`§`target_data: &'a mut RustcTargetData<'gctx>`§`requested_targets: &'a [CompileKind]`

The platforms to build for, requested by the user.

§`resolve: &'a Resolve`§`package_set: &'a PackageSet<'gctx>`§`opts: FeatureOpts`

Options that change how the feature resolver operates.

§`activated_features: HashMap<(PackageId, FeaturesFor), BTreeSet<InternedString>>`

Map of features activated for each package.

§`activated_dependencies: HashMap<(PackageId, FeaturesFor), BTreeSet<InternedString>>`

Map of optional dependencies activated for each package.

§`processed_deps: HashSet<(PackageId, FeaturesFor)>`

Keeps track of which packages have had its dependencies processed. Used to avoid cycles, and to speed up processing.

§`track_for_host: bool`

If this is `true`, then a non-default `feature_key` needs to be tracked while traversing the graph.

This is only here to avoid calling `has_any_proc_macro` when all feature options are disabled (because `has_any_proc_macro` can trigger downloads). This has to be separate from `FeatureOpts::decouple_host_deps` because `for_host` tracking is also needed for `itarget` to work properly.

§`deferred_weak_dependencies: HashMap<(PackageId, FeaturesFor, InternedString), HashSet<InternedString>>`

`dep_name?/feat_name` features that will be activated if `dep_name` is ever activated.

The key is the `(package, for_host, dep_name)` of the package whose dependency will trigger the addition of new features. The value is the set of features to activate.

## Implementations§

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### impl<'a, 'gctx> FeatureResolver<'a, 'gctx>

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#### pub fn resolve( ws: &Workspace<'gctx>, target_data: &'a mut RustcTargetData<'gctx>, resolve: &Resolve, package_set: &'a PackageSet<'gctx>, cli_features: &CliFeatures, specs: &[PackageIdSpec], requested_targets: &[CompileKind], opts: FeatureOpts, ) -> CargoResult<ResolvedFeatures>

Runs the resolution algorithm and returns a new `ResolvedFeatures` with the result.

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#### fn do_resolve( &mut self, specs: &[PackageIdSpec], cli_features: &CliFeatures, ) -> CargoResult<()>

Performs the process of resolving all features for the resolve graph.

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#### fn activate_pkg( &mut self, pkg_id: PackageId, fk: FeaturesFor, fvs: &[FeatureValue], ) -> CargoResult<()>

Activates `FeatureValue`s on the given package.

This is the main entrance into the recursion of feature activation for a package.

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#### fn activate_fv( &mut self, pkg_id: PackageId, fk: FeaturesFor, fv: &FeatureValue, ) -> CargoResult<()>

Activate a single FeatureValue for a package.

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#### fn activate_rec( &mut self, pkg_id: PackageId, fk: FeaturesFor, feature_to_enable: InternedString, ) -> CargoResult<()>

Activate the given feature for the given package, and then recursively activate any other features that feature enables.

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#### fn activate_dependency( &mut self, pkg_id: PackageId, fk: FeaturesFor, dep_name: InternedString, ) -> CargoResult<()>

Activate a dependency (`dep:dep_name` syntax).

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#### fn activate_dep_feature( &mut self, pkg_id: PackageId, fk: FeaturesFor, dep_name: InternedString, dep_feature: InternedString, weak: bool, ) -> CargoResult<()>

Activate a feature within a dependency (`dep_name/feat_name` syntax).

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#### fn fvs_from_dependency( &self, dep_id: PackageId, dep: &Dependency, ) -> Vec<FeatureValue>

Returns Vec of FeatureValues from a Dependency definition.

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#### fn fvs_from_requested( &self, pkg_id: PackageId, cli_features: &CliFeatures, ) -> Vec<FeatureValue>

Returns Vec of FeatureValues from a set of command-line features.

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#### fn deps( &mut self, pkg_id: PackageId, fk: FeaturesFor, ) -> CargoResult<Vec<(PackageId, Vec<(&'a Dependency, FeaturesFor)>)>>

Returns the dependencies for a package, filtering out inactive targets.

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#### fn compare(&self)

Compare the activated features to the resolver. Used for testing.

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#### fn has_any_proc_macro(&self, package_id: PackageId) -> bool

Whether the given package has any proc macro target, including proc-macro examples.

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#### fn has_proc_macro_lib(&self, package_id: PackageId) -> bool

Whether the given package is a proc macro lib target.

This is useful for checking if a dependency is a proc macro, as it is not possible to depend on a non-lib target as a proc-macro.

## Auto Trait Implementations§

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### impl<'a, 'gctx> Freeze for FeatureResolver<'a, 'gctx>

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### impl<'a, 'gctx> !RefUnwindSafe for FeatureResolver<'a, 'gctx>

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### impl<'a, 'gctx> !Send for FeatureResolver<'a, 'gctx>

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### impl<'a, 'gctx> !Sync for FeatureResolver<'a, 'gctx>

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### impl<'a, 'gctx> Unpin for FeatureResolver<'a, 'gctx>

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### impl<'a, 'gctx> !UnwindSafe for FeatureResolver<'a, 'gctx>

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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where F: FnOnce(&Self) -> bool,

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#### const ALIGN: usize = _

The alignment of pointer.
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#### type Init = T

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Initializes a with the given initializer. Read more
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Dereferences the given pointer. Read more
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### impl<T, U> TryInto<U> for T
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#### type Error = <U as TryFrom<T>>::Error

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## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 248 bytes