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RsCachedImplItem.kt
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RsCachedImplItem.kt
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/*
* Use of this source code is governed by the MIT license that can be
* found in the LICENSE file.
*/
package org.rust.lang.core.resolve
import com.intellij.util.SmartList
import com.intellij.util.recursionSafeLazy
import gnu.trove.THashMap
import org.rust.lang.core.crate.Crate
import org.rust.lang.core.psi.RsImplItem
import org.rust.lang.core.psi.RsTraitItem
import org.rust.lang.core.psi.RsTraitRef
import org.rust.lang.core.psi.ext.*
import org.rust.lang.core.psi.isValidProjectMemberAndContainingCrate
import org.rust.lang.core.types.BoundElement
import org.rust.lang.core.types.consts.CtConstParameter
import org.rust.lang.core.types.infer.constGenerics
import org.rust.lang.core.types.infer.generics
import org.rust.lang.core.types.rawType
import org.rust.lang.core.types.ty.Ty
import org.rust.lang.core.types.ty.TyTypeParameter
import kotlin.LazyThreadSafetyMode.PUBLICATION
/**
* Used for optimization purposes, to reduce access to cache and PSI tree in some very hot places,
* [ImplLookup.assembleCandidates] and [processAssociatedItems] in particular
*/
class RsCachedImplItem(
val impl: RsImplItem
) {
private val traitRef: RsTraitRef? = impl.traitRef
val containingCrate: Crate?
val containingCrates: List<Crate>
val isValid: Boolean
val isNegativeImpl: Boolean = impl.isNegativeImpl
init {
val (isValid, crate, crates) = impl.isValidProjectMemberAndContainingCrate
this.containingCrate = crate
this.containingCrates = crates
this.isValid = isValid && !impl.isReservationImpl
}
val isInherent: Boolean get() = traitRef == null
val implementedTrait: BoundElement<RsTraitItem>? by recursionSafeLazy { traitRef?.resolveToBoundTrait() }
val typeAndGenerics: Triple<Ty, List<TyTypeParameter>, List<CtConstParameter>>? by lazy(PUBLICATION) {
impl.typeReference?.rawType?.let { Triple(it, impl.generics, impl.constGenerics) }
}
/** For `impl T for Foo` returns union of impl members and trait `T` members that are not overriden by the impl */
val implAndTraitExpandedMembers: Map<String, List<RsAbstractable>> by lazy(PUBLICATION) {
val membersMap = THashMap<String, MutableList<RsAbstractable>>()
for (member in impl.members?.expandedMembers.orEmpty()) {
val name = member.name ?: continue
membersMap.getOrPut(name) { SmartList() }.add(member)
}
val traitMembers = implementedTrait?.element?.members?.expandedMembers
?: return@lazy membersMap
val implMemberNames = HashSet<String>(membersMap.keys)
for (member in traitMembers) {
val name = member.name ?: continue
if (name in implMemberNames) continue
membersMap.getOrPut(name) { SmartList() }.add(member)
}
membersMap
}
// Reduces heap memory usage by reducing number on `TraitImplSource.ExplicitImpl` instances
val explicitImpl: TraitImplSource.ExplicitImpl = TraitImplSource.ExplicitImpl(this)
companion object {
fun forImpl(impl: RsImplItem): RsCachedImplItem {
return (impl as RsImplItemImplMixin).cachedImplItem.value
}
}
}