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/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.resolve
import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.config.LanguageVersionSettings
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.descriptors.annotations.Annotations
import org.jetbrains.kotlin.descriptors.impl.FunctionDescriptorImpl
import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor
import org.jetbrains.kotlin.descriptors.impl.PropertyDescriptorImpl
import org.jetbrains.kotlin.descriptors.impl.VariableDescriptorWithInitializerImpl
import org.jetbrains.kotlin.diagnostics.Errors.*
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.psi.KtProperty
import org.jetbrains.kotlin.psi.KtPsiUtil
import org.jetbrains.kotlin.psi.KtVariableDeclaration
import org.jetbrains.kotlin.resolve.calls.components.InferenceSession
import org.jetbrains.kotlin.resolve.calls.context.ContextDependency
import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
import org.jetbrains.kotlin.resolve.calls.util.isSingleUnderscore
import org.jetbrains.kotlin.resolve.lazy.ForceResolveUtil
import org.jetbrains.kotlin.resolve.scopes.LexicalScope
import org.jetbrains.kotlin.resolve.source.toSourceElement
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.expressions.*
import org.jetbrains.kotlin.types.expressions.typeInfoFactory.noTypeInfo
class LocalVariableResolver(
private val modifiersChecker: ModifiersChecker,
private val identifierChecker: IdentifierChecker,
private val dataFlowAnalyzer: DataFlowAnalyzer,
private val annotationResolver: AnnotationResolver,
private val variableTypeAndInitializerResolver: VariableTypeAndInitializerResolver,
private val delegatedPropertyResolver: DelegatedPropertyResolver,
private val languageVersionSettings: LanguageVersionSettings,
private val dataFlowValueFactory: DataFlowValueFactory
) {
fun process(
property: KtProperty,
typingContext: ExpressionTypingContext,
scope: LexicalScope,
facade: ExpressionTypingFacade
): Pair {
val context = typingContext.replaceContextDependency(ContextDependency.INDEPENDENT).replaceScope(scope)
val receiverTypeRef = property.receiverTypeReference
if (receiverTypeRef != null) {
context.trace.report(LOCAL_EXTENSION_PROPERTY.on(receiverTypeRef))
}
val getter = property.getter
if (getter != null) {
context.trace.report(LOCAL_VARIABLE_WITH_GETTER.on(getter))
}
val setter = property.setter
if (setter != null) {
context.trace.report(LOCAL_VARIABLE_WITH_SETTER.on(setter))
}
val propertyDescriptor =
resolveLocalVariableDescriptor(scope, property, context.dataFlowInfo, context.inferenceSession, context.trace)
val delegateExpression = property.delegateExpression
if (delegateExpression != null) {
if (!languageVersionSettings.supportsFeature(LanguageFeature.LocalDelegatedProperties)) {
context.trace.report(
UNSUPPORTED_FEATURE.on(
property.delegate!!,
LanguageFeature.LocalDelegatedProperties to languageVersionSettings
)
)
}
if (propertyDescriptor is VariableDescriptorWithAccessors) {
delegatedPropertyResolver.resolvePropertyDelegate(
typingContext.dataFlowInfo,
property,
propertyDescriptor,
delegateExpression,
typingContext.scope,
typingContext.inferenceSession,
typingContext.trace
)
propertyDescriptor.getter?.updateAccessorFlagsFromResolvedCallForDelegatedProperty(typingContext.trace)
propertyDescriptor.setter?.updateAccessorFlagsFromResolvedCallForDelegatedProperty(typingContext.trace)
}
}
val initializer = property.initializer
var typeInfo: KotlinTypeInfo
if (initializer != null) {
val outType = propertyDescriptor.type
typeInfo = facade.getTypeInfo(initializer, context.replaceExpectedType(outType))
val dataFlowInfo = typeInfo.dataFlowInfo
val type = typeInfo.type
if (type != null) {
val initializerDataFlowValue = dataFlowValueFactory.createDataFlowValue(initializer, type, context)
if (!propertyDescriptor.isVar && initializerDataFlowValue.canBeBound) {
context.trace.record(BindingContext.BOUND_INITIALIZER_VALUE, propertyDescriptor, initializerDataFlowValue)
}
// At this moment we do not take initializer value into account if type is given for a property
// We can comment this condition to take them into account, like here: var s: String? = "xyz"
// In this case s will be not-nullable until it is changed
if (property.typeReference == null) {
val variableDataFlowValue = dataFlowValueFactory.createDataFlowValueForProperty(
property, propertyDescriptor, context.trace.bindingContext,
DescriptorUtils.getContainingModuleOrNull(scope.ownerDescriptor)
)
// We cannot say here anything new about initializerDataFlowValue
// except it has the same value as variableDataFlowValue
typeInfo = typeInfo.replaceDataFlowInfo(
dataFlowInfo.assign(
variableDataFlowValue, initializerDataFlowValue,
languageVersionSettings
)
)
}
}
} else {
typeInfo = noTypeInfo(context)
}
checkLocalVariableDeclaration(context, propertyDescriptor, property)
return Pair(typeInfo.replaceType(dataFlowAnalyzer.checkStatementType(property, context)), propertyDescriptor)
}
private fun checkLocalVariableDeclaration(context: ExpressionTypingContext, descriptor: VariableDescriptor, ktProperty: KtProperty) {
ExpressionTypingUtils.checkVariableShadowing(context.scope, context.trace, descriptor)
modifiersChecker.withTrace(context.trace).checkModifiersForLocalDeclaration(ktProperty, descriptor)
identifierChecker.checkDeclaration(ktProperty, context.trace)
LateinitModifierApplicabilityChecker.checkLateinitModifierApplicability(context.trace, ktProperty, descriptor)
}
private fun resolveLocalVariableDescriptor(
scope: LexicalScope,
variable: KtVariableDeclaration,
dataFlowInfo: DataFlowInfo,
inferenceSession: InferenceSession,
trace: BindingTrace
): VariableDescriptor {
val containingDeclaration = scope.ownerDescriptor
val result: VariableDescriptorWithInitializerImpl
val type: KotlinType
if (KtPsiUtil.isScriptDeclaration(variable)) {
val propertyDescriptor = PropertyDescriptorImpl.create(
containingDeclaration,
annotationResolver.resolveAnnotationsWithArguments(scope, variable.modifierList, trace),
Modality.FINAL,
DescriptorVisibilities.INTERNAL,
variable.isVar,
KtPsiUtil.safeName(variable.name),
CallableMemberDescriptor.Kind.DECLARATION,
variable.toSourceElement(),
/* lateInit = */ false,
/* isConst = */ false,
/* isExpect = */ false,
/* isActual = */ false,
/* isExternal = */ false,
variable is KtProperty && variable.hasDelegate()
)
// For a local variable the type must not be deferred
type = variableTypeAndInitializerResolver.resolveType(
propertyDescriptor, scope, variable, dataFlowInfo, inferenceSession, trace, local = true
)
val receiverParameter = (containingDeclaration as ScriptDescriptor).thisAsReceiverParameter
propertyDescriptor.setType(type, emptyList(), receiverParameter, null)
initializeWithDefaultGetterSetter(propertyDescriptor)
trace.record(BindingContext.VARIABLE, variable, propertyDescriptor)
result = propertyDescriptor
} else {
val variableDescriptor = resolveLocalVariableDescriptorWithType(scope, variable, null, trace)
// For a local variable the type must not be deferred
type = variableTypeAndInitializerResolver.resolveType(
variableDescriptor, scope, variable, dataFlowInfo, inferenceSession, trace, local = true
)
variableDescriptor.setOutType(type)
result = variableDescriptor
}
variableTypeAndInitializerResolver
.setConstantForVariableIfNeeded(result, scope, variable, dataFlowInfo, type, inferenceSession, trace)
// Type annotations also should be resolved
ForceResolveUtil.forceResolveAllContents(type.annotations)
return result
}
private fun initializeWithDefaultGetterSetter(propertyDescriptor: PropertyDescriptorImpl) {
var getter = propertyDescriptor.getter
if (getter == null && !DescriptorVisibilities.isPrivate(propertyDescriptor.visibility)) {
getter = DescriptorFactory.createDefaultGetter(propertyDescriptor, Annotations.EMPTY)
getter.initialize(propertyDescriptor.type)
}
var setter = propertyDescriptor.setter
if (setter == null && propertyDescriptor.isVar) {
setter = DescriptorFactory.createDefaultSetter(propertyDescriptor, Annotations.EMPTY, Annotations.EMPTY)
}
propertyDescriptor.initialize(getter, setter)
}
internal fun resolveLocalVariableDescriptorWithType(
scope: LexicalScope,
variable: KtVariableDeclaration,
type: KotlinType?,
trace: BindingTrace
): LocalVariableDescriptor {
val hasDelegate = variable is KtProperty && variable.hasDelegate()
val hasLateinit = variable.hasModifier(KtTokens.LATEINIT_KEYWORD)
val variableDescriptor = LocalVariableDescriptor(
scope.ownerDescriptor,
annotationResolver.resolveAnnotationsWithArguments(scope, variable.modifierList, trace),
// Note, that the same code works both for common local vars and for destructuring declarations,
// but since the first case is illegal error must be reported somewhere else
if (variable.isSingleUnderscore)
Name.special("")
else
KtPsiUtil.safeName(variable.name),
type,
variable.isVar,
hasDelegate,
hasLateinit,
variable.toSourceElement()
)
trace.record(BindingContext.VARIABLE, variable, variableDescriptor)
return variableDescriptor
}
private fun VariableAccessorDescriptor.updateAccessorFlagsFromResolvedCallForDelegatedProperty(trace: BindingTrace) {
if (this is FunctionDescriptorImpl) {
val resultingDescriptor = trace.bindingContext.get(BindingContext.DELEGATED_PROPERTY_RESOLVED_CALL, this)?.resultingDescriptor
if (resultingDescriptor != null) {
setSuspend(resultingDescriptor.isSuspend)
}
}
}
}
