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/*
* Copyright 2010-2015 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.calls
import com.google.common.collect.Lists
import com.google.common.collect.Sets
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.builtins.ReflectionTypes
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.diagnostics.Errors.SUPER_CANT_BE_EXTENSION_RECEIVER
import org.jetbrains.kotlin.progress.ProgressIndicatorAndCompilationCanceledStatus
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.resolve.*
import org.jetbrains.kotlin.resolve.callableReferences.getReflectionTypeForCandidateDescriptor
import org.jetbrains.kotlin.resolve.calls.CallTransformer.CallForImplicitInvoke
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.ResolveArgumentsMode
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.ResolveArgumentsMode.SHAPE_FUNCTION_ARGUMENTS
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.getEffectiveExpectedType
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.getErasedReceiverType
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.isInvokeCallOnExpressionWithBothReceivers
import org.jetbrains.kotlin.resolve.calls.callUtil.isExplicitSafeCall
import org.jetbrains.kotlin.resolve.calls.callUtil.isSafeCall
import org.jetbrains.kotlin.resolve.calls.checkers.AdditionalTypeChecker
import org.jetbrains.kotlin.resolve.calls.context.*
import org.jetbrains.kotlin.resolve.calls.inference.SubstitutionFilteringInternalResolveAnnotations
import org.jetbrains.kotlin.resolve.calls.model.ArgumentMatchStatus
import org.jetbrains.kotlin.resolve.calls.model.MutableResolvedCall
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.resolve.calls.results.ResolutionStatus
import org.jetbrains.kotlin.resolve.calls.results.ResolutionStatus.*
import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
import org.jetbrains.kotlin.resolve.calls.smartcasts.SmartCastManager
import org.jetbrains.kotlin.resolve.calls.util.FakeCallableDescriptorForObject
import org.jetbrains.kotlin.resolve.scopes.receivers.ExpressionReceiver
import org.jetbrains.kotlin.resolve.scopes.receivers.Receiver
import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
import org.jetbrains.kotlin.types.*
import org.jetbrains.kotlin.types.TypeUtils.noExpectedType
import org.jetbrains.kotlin.types.checker.KotlinTypeChecker
import java.util.*
class CandidateResolver(
private val argumentTypeResolver: ArgumentTypeResolver,
private val genericCandidateResolver: GenericCandidateResolver,
private val reflectionTypes: ReflectionTypes,
private val additionalTypeCheckers: Iterable,
private val smartCastManager: SmartCastManager
) {
fun performResolutionForCandidateCall(
context: CallCandidateResolutionContext,
checkArguments: CheckArgumentTypesMode
): Unit = with(context) {
ProgressIndicatorAndCompilationCanceledStatus.checkCanceled()
if (ErrorUtils.isError(candidateDescriptor)) {
candidateCall.addStatus(SUCCESS)
return
}
if (!checkOuterClassMemberIsAccessible(this)) {
candidateCall.addStatus(OTHER_ERROR)
return
}
if (!context.isDebuggerContext) {
checkVisibility()
}
when (checkArguments) {
CheckArgumentTypesMode.CHECK_VALUE_ARGUMENTS ->
mapArguments()
CheckArgumentTypesMode.CHECK_CALLABLE_TYPE ->
checkExpectedCallableType()
}
checkReceiverTypeError()
checkExtensionReceiver()
checkDispatchReceiver()
processTypeArguments()
checkValueArguments()
checkAbstractAndSuper()
checkNonExtensionCalledWithReceiver()
}
private fun CallCandidateResolutionContext<*>.checkValueArguments() = checkAndReport {
if (call.getTypeArguments().isEmpty()
&& !candidateDescriptor.typeParameters.isEmpty()
&& candidateCall.getKnownTypeParametersSubstitutor() == null
) {
genericCandidateResolver.inferTypeArguments(this)
}
else {
checkAllValueArguments(this, SHAPE_FUNCTION_ARGUMENTS).status
}
}
private fun CallCandidateResolutionContext<*>.processTypeArguments() = check {
val jetTypeArguments = call.getTypeArguments()
if (candidateCall.knownTypeParametersSubstitutor != null) {
candidateCall.setResultingSubstitutor(candidateCall.knownTypeParametersSubstitutor!!)
}
else if (!jetTypeArguments.isEmpty()) {
// Explicit type arguments passed
val typeArguments = ArrayList()
for (projection in jetTypeArguments) {
val type = projection.typeReference?.let { trace.bindingContext.get(BindingContext.TYPE, it) }
?: ErrorUtils.createErrorType("Star projection in a call")
typeArguments.add(type)
}
val expectedTypeArgumentCount = candidateDescriptor.typeParameters.size
for (index in jetTypeArguments.size..expectedTypeArgumentCount - 1) {
typeArguments.add(ErrorUtils.createErrorType(
"Explicit type argument expected for " + candidateDescriptor.typeParameters.get(index).name))
}
val substitution = FunctionDescriptorUtil.createSubstitution(candidateDescriptor as FunctionDescriptor, typeArguments)
val substitutor = TypeSubstitutor.create(SubstitutionFilteringInternalResolveAnnotations(substitution))
if (expectedTypeArgumentCount != jetTypeArguments.size) {
candidateCall.addStatus(OTHER_ERROR)
tracing.wrongNumberOfTypeArguments(trace, expectedTypeArgumentCount)
}
else {
checkGenericBoundsInAFunctionCall(jetTypeArguments, typeArguments, candidateDescriptor, substitutor, trace)
}
candidateCall.setResultingSubstitutor(substitutor)
}
}
private fun CallCandidateResolutionContext.mapArguments()
= check {
val argumentMappingStatus = ValueArgumentsToParametersMapper.mapValueArgumentsToParameters(
call, tracing, candidateCall, Sets.newLinkedHashSet())
if (!argumentMappingStatus.isSuccess) {
candidateCall.addStatus(ARGUMENTS_MAPPING_ERROR)
}
}
private fun CallCandidateResolutionContext.checkExpectedCallableType()
= check {
if (!noExpectedType(expectedType)) {
val candidate = candidateCall.getCandidateDescriptor()
val candidateReflectionType = getReflectionTypeForCandidateDescriptor(candidate, reflectionTypes);
if (candidateReflectionType != null) {
if (!KotlinTypeChecker.DEFAULT.isSubtypeOf(candidateReflectionType, expectedType)) {
candidateCall.addStatus(OTHER_ERROR)
}
}
else {
candidateCall.addStatus(OTHER_ERROR)
}
}
}
private fun CallCandidateResolutionContext<*>.checkVisibility() = checkAndReport {
val invisibleMember = Visibilities.findInvisibleMember(candidateCall.dispatchReceiver, candidateDescriptor, scope.ownerDescriptor)
if (invisibleMember != null) {
tracing.invisibleMember(trace, invisibleMember)
OTHER_ERROR
} else {
SUCCESS
}
}
private fun CallCandidateResolutionContext<*>.checkExtensionReceiver() = checkAndReport {
val receiverParameter = candidateCall.getCandidateDescriptor().extensionReceiverParameter
val receiverArgument = candidateCall.getExtensionReceiver()
if (receiverParameter != null && receiverArgument == null) {
tracing.missingReceiver(candidateCall.getTrace(), receiverParameter)
OTHER_ERROR
}
else if (receiverParameter == null && receiverArgument != null) {
tracing.noReceiverAllowed(candidateCall.getTrace())
if (call.getCalleeExpression() is KtSimpleNameExpression) {
RECEIVER_PRESENCE_ERROR
}
else {
OTHER_ERROR
}
}
else {
SUCCESS
}
}
private fun CallCandidateResolutionContext<*>.checkDispatchReceiver() = checkAndReport {
val candidateDescriptor = candidateDescriptor
val dispatchReceiver = candidateCall.getDispatchReceiver()
if (dispatchReceiver != null) {
var nestedClass: ClassDescriptor? = null
if (candidateDescriptor is ConstructorDescriptor
&& DescriptorUtils.isStaticNestedClass(candidateDescriptor.containingDeclaration)
) {
nestedClass = candidateDescriptor.containingDeclaration
}
else if (candidateDescriptor is FakeCallableDescriptorForObject) {
nestedClass = candidateDescriptor.getReferencedDescriptor()
}
if (nestedClass != null) {
tracing.nestedClassAccessViaInstanceReference(trace, nestedClass, candidateCall.getExplicitReceiverKind())
return@checkAndReport OTHER_ERROR
}
}
assert((dispatchReceiver != null) == (candidateCall.getResultingDescriptor().dispatchReceiverParameter != null)) {
"Shouldn't happen because of TaskPrioritizer: $candidateDescriptor"
}
SUCCESS
}
private fun checkOuterClassMemberIsAccessible(context: CallCandidateResolutionContext<*>): Boolean {
// In "[email protected]()" the error will be reported on "this@Outer" instead
if (context.call.getExplicitReceiver() != null || context.call.getDispatchReceiver() != null) return true
val candidateThis = getDeclaringClass(context.candidateCall.getCandidateDescriptor())
if (candidateThis == null || candidateThis.kind.isSingleton) return true
return DescriptorResolver.checkHasOuterClassInstance(context.scope, context.trace, context.call.getCallElement(), candidateThis)
}
private fun CallCandidateResolutionContext<*>.checkAbstractAndSuper() = check {
val descriptor = candidateDescriptor
val expression = candidateCall.getCall().getCalleeExpression()
if (expression is KtSimpleNameExpression) {
// 'B' in 'class A: B()' is JetConstructorCalleeExpression
if (descriptor is ConstructorDescriptor) {
val modality = descriptor.containingDeclaration.modality
if (modality == Modality.ABSTRACT) {
tracing.instantiationOfAbstractClass(trace)
}
}
}
val superDispatchReceiver = getReceiverSuper(candidateCall.getDispatchReceiver())
if (superDispatchReceiver != null) {
if (descriptor is MemberDescriptor && descriptor.modality == Modality.ABSTRACT) {
tracing.abstractSuperCall(trace)
candidateCall.addStatus(OTHER_ERROR)
}
}
// 'super' cannot be passed as an argument, for receiver arguments expression typer does not track this
// See TaskPrioritizer for more
val superExtensionReceiver = getReceiverSuper(candidateCall.getExtensionReceiver())
if (superExtensionReceiver != null) {
trace.report(SUPER_CANT_BE_EXTENSION_RECEIVER.on(superExtensionReceiver, superExtensionReceiver.getText()))
candidateCall.addStatus(OTHER_ERROR)
}
}
private fun CallCandidateResolutionContext<*>.checkNonExtensionCalledWithReceiver() = checkAndReport {
val call = candidateCall.call
if (call is CallTransformer.CallForImplicitInvoke && candidateCall.extensionReceiver != null
&& candidateCall.dispatchReceiver != null
) {
if (call.dispatchReceiver == candidateCall.dispatchReceiver
&& !KotlinBuiltIns.isExactExtensionFunctionType(call.dispatchReceiver.type)
) {
tracing.nonExtensionFunctionCalledAsExtension(trace)
return@checkAndReport OTHER_ERROR
}
}
SUCCESS
}
private fun getReceiverSuper(receiver: Receiver?): KtSuperExpression? {
if (receiver is ExpressionReceiver) {
val expression = receiver.expression
if (expression is KtSuperExpression) {
return expression
}
}
return null
}
private fun getDeclaringClass(candidate: CallableDescriptor): ClassDescriptor? {
val expectedThis = candidate.dispatchReceiverParameter ?: return null
val descriptor = expectedThis.containingDeclaration
return if (descriptor is ClassDescriptor) descriptor else null
}
fun checkAllValueArguments(
context: CallCandidateResolutionContext,
resolveFunctionArgumentBodies: ResolveArgumentsMode): ValueArgumentsCheckingResult {
val checkingResult = checkValueArgumentTypes(context, context.candidateCall, resolveFunctionArgumentBodies)
var resultStatus = checkingResult.status
resultStatus = resultStatus.combine(checkReceivers(context))
return ValueArgumentsCheckingResult(resultStatus, checkingResult.argumentTypes)
}
private fun > checkValueArgumentTypes(
context: CallResolutionContext,
candidateCall: MutableResolvedCall,
resolveFunctionArgumentBodies: ResolveArgumentsMode): ValueArgumentsCheckingResult {
var resultStatus = SUCCESS
val argumentTypes = Lists.newArrayList()
val infoForArguments = candidateCall.getDataFlowInfoForArguments()
for (entry in candidateCall.getValueArguments().entries) {
val parameterDescriptor = entry.key
val resolvedArgument = entry.value
for (argument in resolvedArgument.arguments) {
val expression = argument.getArgumentExpression() ?: continue
val expectedType = getEffectiveExpectedType(parameterDescriptor, argument)
val newContext = context.replaceDataFlowInfo(infoForArguments.getInfo(argument)).replaceExpectedType(expectedType)
val typeInfoForCall = argumentTypeResolver.getArgumentTypeInfo(
expression, newContext, resolveFunctionArgumentBodies)
val type = typeInfoForCall.type
infoForArguments.updateInfo(argument, typeInfoForCall.dataFlowInfo)
var matchStatus = ArgumentMatchStatus.SUCCESS
var resultingType: KotlinType? = type
if (type == null || (type.isError && !type.isFunctionPlaceholder)) {
matchStatus = ArgumentMatchStatus.ARGUMENT_HAS_NO_TYPE
}
else if (!noExpectedType(expectedType)) {
if (!ArgumentTypeResolver.isSubtypeOfForArgumentType(type, expectedType)) {
val smartCast = smartCastValueArgumentTypeIfPossible(expression, newContext.expectedType, type, newContext)
if (smartCast == null) {
resultStatus = OTHER_ERROR
matchStatus = ArgumentMatchStatus.TYPE_MISMATCH
}
else {
resultingType = smartCast
}
}
else if (ErrorUtils.containsUninferredParameter(expectedType)) {
matchStatus = ArgumentMatchStatus.MATCH_MODULO_UNINFERRED_TYPES
}
val spreadElement = argument.getSpreadElement()
if (spreadElement != null && !type.isFlexible() && type.isMarkedNullable) {
val dataFlowValue = DataFlowValueFactory.createDataFlowValue(expression, type, context)
val smartCastResult = SmartCastManager.checkAndRecordPossibleCast(dataFlowValue, expectedType, expression, context, null, false)
if (smartCastResult == null || !smartCastResult.isCorrect) {
context.trace.report(Errors.SPREAD_OF_NULLABLE.on(spreadElement));
}
}
}
argumentTypes.add(resultingType)
candidateCall.recordArgumentMatchStatus(argument, matchStatus)
}
}
return ValueArgumentsCheckingResult(resultStatus, argumentTypes)
}
private fun smartCastValueArgumentTypeIfPossible(
expression: KtExpression,
expectedType: KotlinType,
actualType: KotlinType,
context: ResolutionContext<*>): KotlinType? {
val receiverToCast = ExpressionReceiver.create(KtPsiUtil.safeDeparenthesize(expression), actualType, context.trace.bindingContext)
val variants = smartCastManager.getSmartCastVariantsExcludingReceiver(context, receiverToCast)
for (possibleType in variants) {
if (KotlinTypeChecker.DEFAULT.isSubtypeOf(possibleType, expectedType)) {
return possibleType
}
}
return null
}
private fun CallCandidateResolutionContext<*>.checkReceiverTypeError(): Unit = check {
val extensionReceiver = candidateDescriptor.extensionReceiverParameter
val dispatchReceiver = candidateDescriptor.dispatchReceiverParameter
// For the expressions like '42.(f)()' where f: String.() -> Unit we'd like to generate a type mismatch error on '1',
// not to throw away the candidate, so the following check is skipped.
if (!isInvokeCallOnExpressionWithBothReceivers(call)) {
val callExtensionReceiver = candidateCall.extensionReceiver
assert(callExtensionReceiver is ReceiverValue?) { "Expected ReceiverValue, got $callExtensionReceiver" }
checkReceiverTypeError(extensionReceiver, callExtensionReceiver as ReceiverValue?)
}
checkReceiverTypeError(dispatchReceiver, candidateCall.getDispatchReceiver())
}
private fun CallCandidateResolutionContext<*>.checkReceiverTypeError(
receiverParameterDescriptor: ReceiverParameterDescriptor?,
receiverArgument: ReceiverValue?
) = checkAndReport {
if (receiverParameterDescriptor == null || receiverArgument == null) return@checkAndReport SUCCESS
val erasedReceiverType = getErasedReceiverType(receiverParameterDescriptor, candidateDescriptor)
if (!smartCastManager.isSubTypeBySmartCastIgnoringNullability(receiverArgument, erasedReceiverType, this)) {
RECEIVER_TYPE_ERROR
} else {
SUCCESS
}
}
private fun checkReceivers(context: CallCandidateResolutionContext): ResolutionStatus {
var resultStatus = SUCCESS
val candidateCall = context.candidateCall
// Comment about a very special case.
// Call 'b.foo(1)' where class 'Foo' has an extension member 'fun B.invoke(Int)' should be checked two times for safe call (in 'checkReceiver'), because
// both 'b' (receiver) and 'foo' (this object) might be nullable. In the first case we mark dot, in the second 'foo'.
// Class 'CallForImplicitInvoke' helps up to recognise this case, and parameter 'implicitInvokeCheck' helps us to distinguish whether we check receiver or this object.
resultStatus = resultStatus.combine(context.checkReceiver(
candidateCall,
candidateCall.getResultingDescriptor().extensionReceiverParameter,
candidateCall.extensionReceiver as ReceiverValue?,
candidateCall.getExplicitReceiverKind().isExtensionReceiver, false))
resultStatus = resultStatus.combine(context.checkReceiver(candidateCall,
candidateCall.getResultingDescriptor().dispatchReceiverParameter, candidateCall.getDispatchReceiver(),
candidateCall.getExplicitReceiverKind().isDispatchReceiver,
// for the invocation 'foo(1)' where foo is a variable of function type we should mark 'foo' if there is unsafe call error
context.call is CallForImplicitInvoke))
return resultStatus
}
private fun CallCandidateResolutionContext.checkReceiver(
candidateCall: MutableResolvedCall,
receiverParameter: ReceiverParameterDescriptor?,
receiverArgument: ReceiverValue?,
isExplicitReceiver: Boolean,
implicitInvokeCheck: Boolean): ResolutionStatus {
if (receiverParameter == null || receiverArgument == null) return SUCCESS
val candidateDescriptor = candidateCall.candidateDescriptor
if (TypeUtils.dependsOnTypeParameters(receiverParameter.type, candidateDescriptor.typeParameters)) return SUCCESS
val isSubtypeBySmartCastIgnoringNullability = smartCastManager.isSubTypeBySmartCastIgnoringNullability(
receiverArgument, receiverParameter.type, this)
if (!isSubtypeBySmartCastIgnoringNullability) {
tracing.wrongReceiverType(
trace, receiverParameter, receiverArgument,
this.replaceCallPosition(CallPosition.ExtensionReceiverPosition(candidateCall)))
return OTHER_ERROR
}
// Here we know that receiver is OK ignoring nullability and check that nullability is OK too
// Doing it simply as full subtyping check (receiverValueType <: receiverParameterType)
val call = candidateCall.call
val safeAccess = isExplicitReceiver && !implicitInvokeCheck && call.isExplicitSafeCall()
val expectedReceiverParameterType = if (safeAccess) TypeUtils.makeNullable(receiverParameter.type) else receiverParameter.type
val smartCastNeeded = !ArgumentTypeResolver.isSubtypeOfForArgumentType(receiverArgument.type, expectedReceiverParameterType)
var reportUnsafeCall = false
val dataFlowValue = DataFlowValueFactory.createDataFlowValue(receiverArgument, this)
val nullability = dataFlowInfo.getPredictableNullability(dataFlowValue)
var nullableImplicitInvokeReceiver = false
var receiverArgumentType = receiverArgument.type
if (implicitInvokeCheck && call is CallForImplicitInvoke && call.isSafeCall()) {
val outerCallReceiver = call.outerCall.explicitReceiver
if (outerCallReceiver != call.explicitReceiver && outerCallReceiver is ReceiverValue) {
val outerReceiverDataFlowValue = DataFlowValueFactory.createDataFlowValue(outerCallReceiver, this)
val outerReceiverNullability = dataFlowInfo.getPredictableNullability(outerReceiverDataFlowValue)
if (outerReceiverNullability.canBeNull() && !TypeUtils.isNullableType(expectedReceiverParameterType)) {
nullableImplicitInvokeReceiver = true
receiverArgumentType = TypeUtils.makeNullable(receiverArgumentType)
}
}
}
val expression = (receiverArgument as? ExpressionReceiver)?.expression
if (nullability.canBeNull() && !nullability.canBeNonNull()) {
if (!TypeUtils.isNullableType(expectedReceiverParameterType)) {
reportUnsafeCall = true
}
if (dataFlowValue.immanentNullability.canBeNonNull()) {
expression?.let { trace.record(BindingContext.SMARTCAST_NULL, it) }
}
}
else if (!nullableImplicitInvokeReceiver && smartCastNeeded) {
// Look if smart cast has some useful nullability info
val smartCastResult = SmartCastManager.checkAndRecordPossibleCast(
dataFlowValue, expectedReceiverParameterType, expression, this, candidateCall.call.calleeExpression, /*recordType =*/true
)
if (smartCastResult == null) {
reportUnsafeCall = true
}
else {
candidateCall.setSmartCastDispatchReceiverType(smartCastResult.resultType)
if (!smartCastResult.isCorrect) {
// Error about unstable smart cast reported within checkAndRecordPossibleCast
return OTHER_ERROR
}
}
}
if (reportUnsafeCall || nullableImplicitInvokeReceiver) {
tracing.unsafeCall(trace, receiverArgumentType, implicitInvokeCheck)
return UNSAFE_CALL_ERROR
}
additionalTypeCheckers.forEach { it.checkReceiver(receiverParameter, receiverArgument, safeAccess, this) }
return SUCCESS
}
inner class ValueArgumentsCheckingResult(val status: ResolutionStatus, val argumentTypes: List)
private fun checkGenericBoundsInAFunctionCall(
jetTypeArguments: List,
typeArguments: List,
functionDescriptor: CallableDescriptor,
substitutor: TypeSubstitutor,
trace: BindingTrace) {
val typeParameters = functionDescriptor.typeParameters
for (i in 0..Math.min(typeParameters.size, jetTypeArguments.size) - 1) {
val typeParameterDescriptor = typeParameters.get(i)
val typeArgument = typeArguments.get(i)
val typeReference = jetTypeArguments.get(i).getTypeReference()
if (typeReference != null) {
DescriptorResolver.checkBounds(typeReference, typeArgument, typeParameterDescriptor, substitutor, trace)
}
}
}
private fun CallCandidateResolutionContext.shouldContinue() =
candidateResolveMode == CandidateResolveMode.FULLY || candidateCall.getStatus().possibleTransformToSuccess()
private inline fun CallCandidateResolutionContext.check(
checker: CallCandidateResolutionContext.() -> Unit
) {
if (shouldContinue()) checker()
}
private inline fun CallCandidateResolutionContext.
checkAndReport(checker: CallCandidateResolutionContext.() -> ResolutionStatus) {
if (shouldContinue()) {
candidateCall.addStatus(checker())
}
}
private val CallCandidateResolutionContext<*>.candidateDescriptor: CallableDescriptor get() = candidateCall.getCandidateDescriptor()
}
