org.jetbrains.kotlin.fir.resolve.calls.Synthetics.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.fir.resolve.calls
import org.jetbrains.kotlin.fir.*
import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
import org.jetbrains.kotlin.fir.declarations.getDeprecationsProviderFromAccessors
import org.jetbrains.kotlin.fir.declarations.isHiddenEverywhereBesideSuperCalls
import org.jetbrains.kotlin.fir.declarations.synthetic.FirSyntheticProperty
import org.jetbrains.kotlin.fir.declarations.synthetic.buildSyntheticProperty
import org.jetbrains.kotlin.fir.declarations.utils.isStatic
import org.jetbrains.kotlin.fir.resolve.transformers.ReturnTypeCalculator
import org.jetbrains.kotlin.fir.scopes.*
import org.jetbrains.kotlin.fir.symbols.SyntheticSymbol
import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
import org.jetbrains.kotlin.fir.symbols.impl.FirSyntheticPropertySymbol
import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
import org.jetbrains.kotlin.fir.types.*
import org.jetbrains.kotlin.name.CallableId
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.types.AbstractTypeChecker
/**
* This symbol is bound to a synthetic property based on Java getter/setter call
*
* See details about such properties here: https://kotlinlang.org/docs/java-interop.html#getters-and-setters).
* Frontend IR creates this kind of symbol each time when x.foo should be resolved to x.getFoo() or x.setFoo().
*/
class FirSimpleSyntheticPropertySymbol(
propertyId: CallableId,
getterId: CallableId
) : FirSyntheticPropertySymbol(propertyId, getterId), SyntheticSymbol {
override fun copy(): FirSyntheticPropertySymbol = FirSimpleSyntheticPropertySymbol(callableId, getterId)
}
class FirSyntheticFunctionSymbol(
callableId: CallableId
) : FirNamedFunctionSymbol(callableId), SyntheticSymbol
class FirSyntheticPropertiesScope private constructor(
val session: FirSession,
private val baseScope: FirTypeScope,
private val dispatchReceiverType: ConeKotlinType,
private val syntheticNamesProvider: FirSyntheticNamesProvider,
private val returnTypeCalculator: ReturnTypeCalculator?,
) : FirContainingNamesAwareScope() {
companion object {
fun createIfSyntheticNamesProviderIsDefined(
session: FirSession,
dispatchReceiverType: ConeKotlinType,
baseScope: FirTypeScope,
returnTypeCalculator: ReturnTypeCalculator? = null,
): FirSyntheticPropertiesScope? {
val syntheticNamesProvider = session.syntheticNamesProvider ?: return null
return FirSyntheticPropertiesScope(
session,
baseScope,
dispatchReceiverType,
syntheticNamesProvider,
returnTypeCalculator,
)
}
}
override fun processPropertiesByName(name: Name, processor: (FirVariableSymbol<*>) -> Unit) {
val getterNames = syntheticNamesProvider.possibleGetterNamesByPropertyName(name)
var getterFound = false
for (getterName in getterNames) {
baseScope.processFunctionsByName(getterName) {
checkGetAndCreateSynthetic(name, getterName, it, needCheckForSetter = true, processor)
getterFound = true
}
}
if (!getterFound && shouldSearchForJavaRecordComponents()) {
baseScope.processFunctionsByName(name) {
if (it.fir.isJavaRecordComponent == true) {
checkGetAndCreateSynthetic(name, name, it, needCheckForSetter = false, processor)
}
}
}
}
private fun shouldSearchForJavaRecordComponents(): Boolean {
/*
* Fast path: if dispatch receiver type is simple type and corresponding
* class is not a java record then there is no need to additional
* search for record components
*/
val dispatchSymbol = dispatchReceiverType.toRegularClassSymbol(session) ?: return true
return dispatchSymbol.fir.isJavaRecord ?: false
}
override fun getCallableNames(): Set = baseScope.getCallableNames().flatMapTo(hashSetOf()) { propertyName ->
syntheticNamesProvider.possiblePropertyNamesByAccessorName(propertyName)
}
override fun getClassifierNames(): Set = emptySet()
private fun checkGetAndCreateSynthetic(
propertyName: Name,
getterName: Name,
getterSymbol: FirNamedFunctionSymbol,
needCheckForSetter: Boolean,
processor: (FirVariableSymbol<*>) -> Unit
) {
val getter = getterSymbol.fir
if (getter.typeParameters.isNotEmpty()) return
if (getter.valueParameters.isNotEmpty()) return
if (getter.isStatic) return
var getterReturnType = (getter.returnTypeRef as? FirResolvedTypeRef)?.type
if (getterReturnType == null && needCheckForSetter) {
// During implicit body resolve phase, we can encounter a reference to a not yet resolved Kotlin class that inherits a
// synthetic property from a Java class. In that case, resolve the return type here, ignoring error types (e.g. cycles).
getterReturnType = returnTypeCalculator?.tryCalculateReturnTypeOrNull(getter)?.type?.takeUnless { it is ConeErrorType }
}
// `void` type is the only case when we've got not-nullable non-enhanced Unit from Java
// And it doesn't make sense to make a synthetic property for `void` typed getters
if (getterReturnType?.isUnit == true && CompilerConeAttributes.EnhancedNullability !in getterReturnType.attributes) return
// Should have Java among overridden _and_ don't have isHiddenEverywhereBesideSuperCalls among them
if (!getterSymbol.mayBeUsedAsGetterForSyntheticProperty()) return
var matchingSetter: FirSimpleFunction? = null
if (needCheckForSetter && getterReturnType != null) {
val setterName = syntheticNamesProvider.setterNameByGetterName(getterName)
baseScope.processFunctionsByName(setterName, fun(setterSymbol: FirNamedFunctionSymbol) {
if (matchingSetter != null) return
val setter = setterSymbol.fir
val parameter = setter.valueParameters.singleOrNull() ?: return
if (setter.typeParameters.isNotEmpty() || setter.isStatic) return
val parameterType = (parameter.returnTypeRef as? FirResolvedTypeRef)?.type ?: return
if (!setterTypeIsConsistentWithGetterType(propertyName, getterSymbol, setterSymbol, parameterType)) return
matchingSetter = setterSymbol.fir
})
}
val property = buildSyntheticProperty(propertyName, getter, matchingSetter)
getter.originalForSubstitutionOverride?.let {
property.originalForSubstitutionOverrideAttr = buildSyntheticProperty(
propertyName,
it,
matchingSetter?.originalForSubstitutionOverride ?: matchingSetter
)
}
val syntheticSymbol = property.symbol
(baseScope as? FirUnstableSmartcastTypeScope)?.apply {
if (isSymbolFromUnstableSmartcast(getterSymbol)) {
markSymbolFromUnstableSmartcast(syntheticSymbol)
}
}
processor(syntheticSymbol)
}
private fun buildSyntheticProperty(propertyName: Name, getter: FirSimpleFunction, setter: FirSimpleFunction?): FirSyntheticProperty {
val classLookupTag = getter.symbol.originalOrSelf().dispatchReceiverClassLookupTagOrNull()
val packageName = classLookupTag?.classId?.packageFqName ?: getter.symbol.callableId.packageName
val className = classLookupTag?.classId?.relativeClassName
return buildSyntheticProperty {
moduleData = session.moduleData
name = propertyName
symbol = FirSimpleSyntheticPropertySymbol(
getterId = getter.symbol.callableId,
propertyId = CallableId(packageName, className, propertyName)
)
delegateGetter = getter
delegateSetter = setter
deprecationsProvider = getDeprecationsProviderFromAccessors(session, getter, setter)
}
}
private fun setterTypeIsConsistentWithGetterType(
propertyName: Name,
getterSymbol: FirNamedFunctionSymbol,
setterSymbol: FirNamedFunctionSymbol,
setterParameterType: ConeKotlinType
): Boolean {
val getterReturnType = getterSymbol.resolvedReturnTypeRef.type
if (AbstractTypeChecker.equalTypes(session.typeContext, getterReturnType, setterParameterType)) return true
if (!AbstractTypeChecker.isSubtypeOf(session.typeContext, getterReturnType, setterParameterType)) return false
/*
* If type of setter parameter is subtype of getter return type, we need to check corresponding "overridden" synthetic
* properties from parent classes. If some of them has this setter or its overridden as base for setter, then current
* setterSymbol can be used as setter for corresponding getterSymbol
*
* See corresponding code in FE 1.0 in `SyntheticJavaPropertyDescriptor.isGoodSetMethod`
* Note that FE 1.0 looks through overrides just ones (by setter hierarchy), but FIR does twice (for setter and getter)
* This is needed because FIR does not create fake overrides for all inherited methods of class, so there may be a
* situation, when in inheritor class only getter is overridden, and setter does not have overriddens at all
*
* class Base {
* public Object getX() {...}
* public Object setX(Object x) {...} // setterSymbol
* }
*
* class Derived extends Base {
* public String getX() {...} // getterSymbol
* // public fake-override Object setX(Object x) {...} // exist in FE 1.0 but not in FIR
* }
*/
fun processOverrides(symbolToStart: FirNamedFunctionSymbol, setterSymbolToCompare: FirNamedFunctionSymbol?): Boolean {
var hasMatchingSetter = false
baseScope.processDirectOverriddenFunctionsWithBaseScope(symbolToStart) l@{ symbol, scope ->
if (hasMatchingSetter) return@l ProcessorAction.STOP
val baseDispatchReceiverType = symbol.dispatchReceiverType ?: return@l ProcessorAction.NEXT
val syntheticScope = FirSyntheticPropertiesScope(session, scope, baseDispatchReceiverType, syntheticNamesProvider, returnTypeCalculator)
val baseProperties = syntheticScope.getProperties(propertyName)
val propertyFound = baseProperties.any {
val baseProperty = it.fir
baseProperty is FirSyntheticProperty && baseProperty.setter?.delegate?.symbol == (setterSymbolToCompare ?: symbol)
}
if (propertyFound) {
hasMatchingSetter = true
ProcessorAction.STOP
} else {
ProcessorAction.NEXT
}
}
return hasMatchingSetter
}
return processOverrides(setterSymbol, setterSymbolToCompare = null)
|| processOverrides(getterSymbol, setterSymbolToCompare = setterSymbol)
}
private fun FirNamedFunctionSymbol.mayBeUsedAsGetterForSyntheticProperty(): Boolean {
var result = false
var isHiddenEverywhereBesideSuperCalls = false
baseScope.processOverriddenFunctionsAndSelf(this) {
val unwrapped = it.unwrapFakeOverrides().fir
if (unwrapped.origin == FirDeclarationOrigin.Enhancement) {
result = true
}
if (unwrapped.isHiddenEverywhereBesideSuperCalls == true) {
isHiddenEverywhereBesideSuperCalls = true
}
ProcessorAction.NEXT
}
return result && !isHiddenEverywhereBesideSuperCalls
}
}
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