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// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.jetbrains.kotlin.idea.caches.lightClasses
import com.intellij.openapi.diagnostic.Logger
import com.intellij.openapi.util.Key
import com.intellij.psi.PsiClass
import com.intellij.psi.PsiMember
import com.intellij.psi.PsiMethod
import com.intellij.psi.impl.java.stubs.PsiJavaFileStub
import org.jetbrains.kotlin.asJava.LightClassBuilder
import org.jetbrains.kotlin.asJava.builder.*
import org.jetbrains.kotlin.asJava.classes.KtLightClass
import org.jetbrains.kotlin.asJava.classes.lazyPub
import org.jetbrains.kotlin.asJava.elements.KtLightField
import org.jetbrains.kotlin.asJava.elements.KtLightFieldImpl
import org.jetbrains.kotlin.asJava.elements.KtLightMethod
import org.jetbrains.kotlin.asJava.elements.KtLightMethodImpl
import org.jetbrains.kotlin.asJava.isSyntheticValuesOrValueOfMethod
import org.jetbrains.kotlin.psi.KtClassOrObject
import org.jetbrains.kotlin.psi.NotNullableUserDataProperty
import org.jetbrains.kotlin.psi.debugText.getDebugText
import org.jetbrains.kotlin.resolve.diagnostics.Diagnostics
import org.jetbrains.kotlin.storage.StorageManager
typealias ExactLightClassContextProvider = () -> LightClassConstructionContext
typealias DummyLightClassContextProvider = (() -> LightClassConstructionContext?)?
typealias DiagnosticsHolderProvider = () -> LazyLightClassDataHolder.DiagnosticsHolder
sealed class LazyLightClassDataHolder(
private val builder: LightClassBuilder,
private val exactContextProvider: ExactLightClassContextProvider,
dummyContextProvider: DummyLightClassContextProvider,
private val diagnosticsHolderProvider: DiagnosticsHolderProvider
) : LightClassDataHolder {
class DiagnosticsHolder(storageManager: StorageManager) {
private val cache = storageManager.createCacheWithNotNullValues<LazyLightClassDataHolder, Diagnostics>()
fun getOrCompute(lazyLightClassDataHolder: LazyLightClassDataHolder, diagnostics: () -> Diagnostics) =
cache.computeIfAbsent(lazyLightClassDataHolder, diagnostics)
}
private val _builderExactContextProvider: LightClassBuilderResult by lazyPub { builder(exactContextProvider()) }
private val exactResultLazyValue = lazyPub { _builderExactContextProvider.stub }
private val lazyInexactStub by lazyPub {
dummyContextProvider?.let { provider -> provider()?.let { context -> builder.invoke(context).stub } }
}
private val inexactStub: PsiJavaFileStub?
get() = if (exactResultLazyValue.isInitialized()) null else lazyInexactStub
override val javaFileStub by exactResultLazyValue
override val extraDiagnostics: Diagnostics
get() = diagnosticsHolderProvider().getOrCompute(this) {
// Force lazy diagnostics computation because otherwise a lot of memory is retained by computation.
// NB: Laziness here is not crucial anyway since somebody already has requested diagnostics and we hope one will use them
_builderExactContextProvider.diagnostics.takeUnless { it.isEmpty() } ?: Diagnostics.EMPTY
}
// for facade or defaultImpls
override fun findData(findDelegate: (PsiJavaFileStub) -> PsiClass): LightClassData =
LazyLightClassData { stub ->
findDelegate(stub)
}
class ForClass(
builder: LightClassBuilder,
exactContextProvider: ExactLightClassContextProvider,
dummyContextProvider: DummyLightClassContextProvider,
diagnosticsHolderProvider: DiagnosticsHolderProvider
) : LazyLightClassDataHolder(builder, exactContextProvider, dummyContextProvider, diagnosticsHolderProvider),
LightClassDataHolder.ForClass {
override fun findDataForClassOrObject(classOrObject: KtClassOrObject): LightClassData =
LazyLightClassData { stub ->
stub.findDelegate(classOrObject)
}
}
class ForFacade(
builder: LightClassBuilder,
exactContextProvider: ExactLightClassContextProvider,
dummyContextProvider: DummyLightClassContextProvider,
diagnosticsHolderProvider: DiagnosticsHolderProvider
) : LazyLightClassDataHolder(builder, exactContextProvider, dummyContextProvider, diagnosticsHolderProvider),
LightClassDataHolder.ForFacade
class ForScript(
builder: LightClassBuilder,
exactContextProvider: ExactLightClassContextProvider,
dummyContextProvider: DummyLightClassContextProvider,
diagnosticsHolderProvider: DiagnosticsHolderProvider
) : LazyLightClassDataHolder(builder, exactContextProvider, dummyContextProvider, diagnosticsHolderProvider),
LightClassDataHolder.ForScript
private inner class LazyLightClassData(
findDelegate: (PsiJavaFileStub) -> PsiClass
) : LightClassData {
override val clsDelegate: PsiClass by lazyPub { findDelegate(javaFileStub) }
private val dummyDelegate: PsiClass? by lazyPub { inexactStub?.let(findDelegate) }
override fun getOwnFields(containingClass: KtLightClass): List<KtLightField> {
if (dummyDelegate == null) return KtLightFieldImpl.fromClsFields(clsDelegate, containingClass)
return dummyDelegate!!.fields.map { dummyField ->
val fieldOrigin = KtLightFieldImpl.getOrigin(dummyField)
val fieldName = dummyField.name
KtLightFieldImpl.lazy(dummyField, fieldOrigin, containingClass) {
val findFieldByName = clsDelegate.findFieldByName(fieldName, false)
if (findFieldByName != null && findFieldByName.checkMatches(dummyField, containingClass)) {
findFieldByName
} else {
// fallback in case of non-matched (like synthetic) fields
//
// it costs some performance and has to happen in rare and odd cases
KtLightFieldImpl.create(
KtLightFieldImpl.getOrigin(dummyField), dummyField, containingClass
)
}
}
}
}
override fun getOwnMethods(containingClass: KtLightClass): List<KtLightMethod> {
if (dummyDelegate == null) return KtLightMethodImpl.fromClsMethods(clsDelegate, containingClass)
return dummyDelegate!!.methods.mapNotNull { dummyMethod ->
if (isSyntheticValuesOrValueOfMethod(dummyMethod)) {
return@mapNotNull null
}
val methodOrigin = KtLightMethodImpl.getOrigin(dummyMethod)
KtLightMethodImpl.lazy(dummyMethod, containingClass, methodOrigin) {
/* Searching all methods may be necessary in some cases where we failed to rollback optimization:
Overriding internal member that was final
Resulting light member is not consistent in this case, so this should happen only for erroneous code
*/
val dummyIndex = dummyMethod.memberIndex
if (dummyIndex != null) {
val methodsWithSameName = clsDelegate.findMethodsByName(dummyMethod.name, false)
val candidateMethod = methodsWithSameName.firstOrNull { it.memberIndex == dummyIndex }
?: clsDelegate.methods.firstOrNull { it.memberIndex == dummyIndex }
if (candidateMethod != null && candidateMethod.checkMatches(dummyMethod, containingClass)) {
return@lazy candidateMethod
}
}
// fallback if unable to find method for a dummy method (e.g. synthetic methods marked explicit or implicit) are
// not visible as own methods.
//
// it costs some performance and has to happen in rare and odd cases
KtLightMethodImpl.create(dummyMethod, KtLightMethodImpl.getOrigin(dummyMethod), containingClass)
}
}
}
}
private fun <T : PsiMember> T.checkMatches(dummyMember: T, containingClass: KtLightClass): Boolean {
val parameterCountMatches = ((this as? PsiMethod)?.parameterList?.parametersCount ?: 0) ==
((dummyMember as? PsiMethod)?.parameterList?.parametersCount ?: 0)
if (this.memberIndex != dummyMember.memberIndex || !parameterCountMatches) {
logMismatch("Wrongly matched ${dummyMember.debugName} to ${this.debugName}", containingClass)
return false
}
return true
}
companion object {
private val LOG = Logger.getInstance(LazyLightClassDataHolder::class.java)
private fun logMismatch(message: String, containingClass: KtLightClass) {
containingClass.kotlinOrigin?.hasLightClassMatchingErrors = true
LOG.warn("$message, class.kt: ${(containingClass.kotlinOrigin)?.getDebugText()}")
}
}
}
private val PsiMember.debugName
get() = "${this::class.java
.simpleName}:${this.name} ${this.memberIndex}" + if (this is PsiMethod) " (with ${parameterList.parametersCount} parameters)" else ""
var KtClassOrObject.hasLightClassMatchingErrors: Boolean by NotNullableUserDataProperty(Key.create("LIGHT_CLASS_MATCHING_ERRORS"), false)
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