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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.calls
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
import org.jetbrains.kotlin.builtins.getValueParameterTypesFromFunctionType
import org.jetbrains.kotlin.builtins.isFunctionType
import org.jetbrains.kotlin.config.CompilerConfiguration
import org.jetbrains.kotlin.config.LanguageVersionSettings
import org.jetbrains.kotlin.descriptors.CallableDescriptor
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.resolve.*
import org.jetbrains.kotlin.resolve.BindingContext.CONSTRAINT_SYSTEM_COMPLETER
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.ResolveArgumentsMode.RESOLVE_FUNCTION_ARGUMENTS
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.getEffectiveExpectedType
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.isInvokeCallOnVariable
import org.jetbrains.kotlin.resolve.calls.callUtil.isCallableReference
import org.jetbrains.kotlin.resolve.calls.callUtil.isFakeElement
import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
import org.jetbrains.kotlin.resolve.calls.context.BasicCallResolutionContext
import org.jetbrains.kotlin.resolve.calls.context.CallCandidateResolutionContext
import org.jetbrains.kotlin.resolve.calls.context.CallPosition
import org.jetbrains.kotlin.resolve.calls.context.CheckArgumentTypesMode
import org.jetbrains.kotlin.resolve.calls.inference.ConstraintSystem
import org.jetbrains.kotlin.resolve.calls.inference.InferenceErrorData
import org.jetbrains.kotlin.resolve.calls.inference.constraintPosition.ConstraintPositionKind.*
import org.jetbrains.kotlin.resolve.calls.inference.filterConstraintsOut
import org.jetbrains.kotlin.resolve.calls.inference.toHandle
import org.jetbrains.kotlin.resolve.calls.model.*
import org.jetbrains.kotlin.resolve.calls.resolvedCallUtil.makeNullableTypeIfSafeReceiver
import org.jetbrains.kotlin.resolve.calls.results.OverloadResolutionResultsImpl
import org.jetbrains.kotlin.resolve.calls.results.ResolutionStatus
import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
import org.jetbrains.kotlin.resolve.calls.tasks.TracingStrategy
import org.jetbrains.kotlin.types.ErrorUtils
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.TypeUtils
import org.jetbrains.kotlin.types.Variance
import org.jetbrains.kotlin.types.expressions.DataFlowAnalyzer
import java.util.*
class CallCompleter(
private val argumentTypeResolver: ArgumentTypeResolver,
private val candidateResolver: CandidateResolver,
private val dataFlowAnalyzer: DataFlowAnalyzer,
private val callCheckers: Iterable,
private val builtIns: KotlinBuiltIns,
private val languageVersionSettings: LanguageVersionSettings
) {
fun completeCall(
context: BasicCallResolutionContext,
results: OverloadResolutionResultsImpl,
tracing: TracingStrategy
): OverloadResolutionResultsImpl {
val resolvedCall = if (results.isSingleResult) results.resultingCall else null
// for the case 'foo(a)' where 'foo' is a variable, the call 'foo.invoke(a)' shouldn't be completed separately,
// it's completed when the outer (variable as function call) is completed
if (!isInvokeCallOnVariable(context.call)) {
val temporaryTrace = TemporaryBindingTrace.create(context.trace, "Trace to complete a resulting call")
completeResolvedCallAndArguments(resolvedCall, results, context.replaceBindingTrace(temporaryTrace), tracing)
completeAllCandidates(context, results)
temporaryTrace.commit()
}
if (resolvedCall != null && context.trace.wantsDiagnostics()) {
val calleeExpression = if (resolvedCall is VariableAsFunctionResolvedCall)
resolvedCall.variableCall.call.calleeExpression
else
resolvedCall.call.calleeExpression
val reportOn =
if (calleeExpression != null && !calleeExpression.isFakeElement) calleeExpression
else resolvedCall.call.callElement
val callCheckerContext = CallCheckerContext(context, languageVersionSettings)
for (callChecker in callCheckers) {
callChecker.check(resolvedCall, reportOn, callCheckerContext)
if (resolvedCall is VariableAsFunctionResolvedCall) {
callChecker.check(resolvedCall.variableCall, reportOn, callCheckerContext)
}
}
}
if (results.isSingleResult && results.resultingCall.status.isSuccess) {
return results.changeStatusToSuccess()
}
return results
}
private fun completeAllCandidates(
context: BasicCallResolutionContext,
results: OverloadResolutionResultsImpl
) {
@Suppress("UNCHECKED_CAST")
val candidates = (if (context.collectAllCandidates) {
results.allCandidates!!
}
else {
results.resultingCalls
}) as Collection>
candidates.filterNot { resolvedCall -> resolvedCall.isCompleted }.forEach {
resolvedCall ->
val temporaryBindingTrace = TemporaryBindingTrace.create(context.trace, "Trace to complete a candidate that is not a resulting call")
completeResolvedCallAndArguments(resolvedCall, results, context.replaceBindingTrace(temporaryBindingTrace), TracingStrategy.EMPTY)
}
}
private fun completeResolvedCallAndArguments(
resolvedCall: MutableResolvedCall?,
results: OverloadResolutionResultsImpl,
context: BasicCallResolutionContext,
tracing: TracingStrategy
) {
if (resolvedCall == null || resolvedCall.isCompleted || resolvedCall.constraintSystem == null) {
completeArguments(context, results)
resolvedCall?.markCallAsCompleted()
return
}
resolvedCall.completeConstraintSystem(context.expectedType, context.trace)
completeArguments(context, results)
resolvedCall.updateResolutionStatusFromConstraintSystem(context, tracing)
resolvedCall.markCallAsCompleted()
}
private fun MutableResolvedCall.completeConstraintSystem(
expectedType: KotlinType,
trace: BindingTrace
) {
val returnType = candidateDescriptor.returnType
val expectedReturnType =
if (call.isCallableReference()) {
// TODO: compute generic type argument for R in the kotlin.Function supertype (KT-12963)
if (!TypeUtils.noExpectedType(expectedType) && expectedType.isFunctionType) expectedType.getReturnTypeFromFunctionType()
else TypeUtils.NO_EXPECTED_TYPE
}
else expectedType
fun ConstraintSystem.Builder.typeInSystem(type: KotlinType?): KotlinType? =
type?.let {
val substitutor = typeVariableSubstitutors[call.toHandle()] ?: error("No substitutor for call: $call")
substitutor.substitute(it, Variance.INVARIANT)
}
fun updateSystemIfNeeded(buildSystemWithAdditionalConstraints: (ConstraintSystem.Builder) -> ConstraintSystem?) {
val system = buildSystemWithAdditionalConstraints(constraintSystem!!.toBuilder())
if (system != null) {
setConstraintSystem(system)
}
}
if (returnType != null && !TypeUtils.noExpectedType(expectedReturnType)) {
updateSystemIfNeeded { builder ->
val returnTypeInSystem = builder.typeInSystem(returnType)
if (returnTypeInSystem != null) {
builder.addSubtypeConstraint(returnTypeInSystem, expectedReturnType, EXPECTED_TYPE_POSITION.position())
builder.build()
}
else null
}
}
val constraintSystemCompleter = trace[CONSTRAINT_SYSTEM_COMPLETER, call.calleeExpression]
if (constraintSystemCompleter != null) {
// todo improve error reporting with errors in constraints from completer
// todo add constraints from completer unconditionally; improve constraints from completer for generic methods
// add the constraints only if they don't lead to errors (except errors from upper bounds to improve diagnostics)
updateSystemIfNeeded { builder ->
constraintSystemCompleter.completeConstraintSystem(builder, this)
val system = builder.build()
val status = system.filterConstraintsOut(TYPE_BOUND_POSITION).status
if (status.hasOnlyErrorsDerivedFrom(FROM_COMPLETER)) null else system
}
}
if (returnType != null && expectedReturnType === TypeUtils.UNIT_EXPECTED_TYPE) {
updateSystemIfNeeded { builder ->
val returnTypeInSystem = builder.typeInSystem(returnType)
if (returnTypeInSystem != null) {
builder.addSubtypeConstraint(returnTypeInSystem, builtIns.unitType, EXPECTED_TYPE_POSITION.position())
val system = builder.build()
if (system.status.isSuccessful()) system else null
}
else null
}
}
if (call.isCallableReference() && !TypeUtils.noExpectedType(expectedType) && expectedType.isFunctionType) {
updateSystemIfNeeded { builder ->
candidateDescriptor.valueParameters.zip(expectedType.getValueParameterTypesFromFunctionType()).forEach { (parameter, argument) ->
val valueParameterInSystem = builder.typeInSystem(parameter.type)
builder.addSubtypeConstraint(valueParameterInSystem, argument.type, VALUE_PARAMETER_POSITION.position(parameter.index))
}
builder.build()
}
}
val builder = constraintSystem!!.toBuilder()
builder.fixVariables()
val system = builder.build()
setConstraintSystem(system)
setResultingSubstitutor(system.resultingSubstitutor)
}
private fun MutableResolvedCall.updateResolutionStatusFromConstraintSystem(
context: BasicCallResolutionContext,
tracing: TracingStrategy
) {
val contextWithResolvedCall = CallCandidateResolutionContext.createForCallBeingAnalyzed(this, context, tracing)
val valueArgumentsCheckingResult = candidateResolver.checkAllValueArguments(contextWithResolvedCall, RESOLVE_FUNCTION_ARGUMENTS)
val status = status
if (constraintSystem!!.status.isSuccessful()) {
if (status == ResolutionStatus.UNKNOWN_STATUS || status == ResolutionStatus.INCOMPLETE_TYPE_INFERENCE) {
setStatusToSuccess()
}
return
}
val receiverType = extensionReceiver?.type
val errorData = InferenceErrorData.create(
candidateDescriptor, constraintSystem!!, valueArgumentsCheckingResult.argumentTypes,
receiverType, context.expectedType, context.call
)
tracing.typeInferenceFailed(context, errorData)
addStatus(ResolutionStatus.OTHER_ERROR)
}
private fun completeArguments(
context: BasicCallResolutionContext,
results: OverloadResolutionResultsImpl
) {
if (context.checkArguments != CheckArgumentTypesMode.CHECK_VALUE_ARGUMENTS) return
val getArgumentMapping: (ValueArgument) -> ArgumentMapping
val getDataFlowInfoForArgument: (ValueArgument) -> DataFlowInfo
if (results.isSingleResult) {
val resolvedCall = results.resultingCall
getArgumentMapping = { argument -> resolvedCall.getArgumentMapping(argument) }
getDataFlowInfoForArgument = { argument -> resolvedCall.dataFlowInfoForArguments.getInfo(argument) }
}
else {
getArgumentMapping = { ArgumentUnmapped }
getDataFlowInfoForArgument = { context.dataFlowInfo }
}
for (valueArgument in context.call.valueArguments) {
val argumentMapping = getArgumentMapping(valueArgument!!)
val (expectedType, callPosition) = when (argumentMapping) {
is ArgumentMatch -> Pair(
getEffectiveExpectedType(argumentMapping.valueParameter, valueArgument),
CallPosition.ValueArgumentPosition(results.resultingCall, argumentMapping.valueParameter, valueArgument))
else -> Pair(TypeUtils.NO_EXPECTED_TYPE, CallPosition.Unknown)
}
val newContext =
context.replaceDataFlowInfo(getDataFlowInfoForArgument(valueArgument))
.replaceExpectedType(expectedType)
.replaceCallPosition(callPosition)
completeOneArgument(valueArgument, newContext)
}
}
private fun completeOneArgument(
valueArgument: ValueArgument,
context: BasicCallResolutionContext
) {
if (valueArgument.isExternal()) return
val expression = valueArgument.getArgumentExpression() ?: return
val deparenthesized = KtPsiUtil.getLastElementDeparenthesized(expression, context.statementFilter) ?: return
val recordedType = context.trace.getType(expression)
var updatedType: KotlinType? = recordedType
val results = completeCallForArgument(deparenthesized, context)
if (results != null && results.isSingleResult) {
val resolvedCall = results.resultingCall
updatedType = if (resolvedCall.hasInferredReturnType()) {
resolvedCall.makeNullableTypeIfSafeReceiver(resolvedCall.resultingDescriptor?.returnType, context)
}
else null
}
// For the cases like 'foo(1)' the type of '1' depends on expected type (it can be Int, Byte, etc.),
// so while the expected type is not known, it's IntegerValueType(1), and should be updated when the expected type is known.
if (recordedType != null && !recordedType.constructor.isDenotable) {
updatedType = argumentTypeResolver.updateResultArgumentTypeIfNotDenotable(context, expression) ?: updatedType
}
updatedType = updateRecordedTypeForArgument(updatedType, recordedType, expression, context.statementFilter, context.trace)
// While the expected type is not known, the function literal arguments are not analyzed (to analyze function literal bodies once),
// but they should be analyzed when the expected type is known (during the call completion).
ArgumentTypeResolver.getFunctionLiteralArgumentIfAny(expression, context)?.let { functionLiteralArgument ->
argumentTypeResolver.getFunctionLiteralTypeInfo(expression, functionLiteralArgument, context, RESOLVE_FUNCTION_ARGUMENTS)
}
// While the expected type is not known, (possibly overloaded) callable references can have placeholder types
// (to avoid exponential search for overloaded higher-order functions).
// They should be analyzed now.
ArgumentTypeResolver.getCallableReferenceExpressionIfAny(expression, context)?.let { callableReferenceArgument ->
argumentTypeResolver.getCallableReferenceTypeInfo(expression, callableReferenceArgument, context, RESOLVE_FUNCTION_ARGUMENTS)
}
dataFlowAnalyzer.checkType(updatedType, deparenthesized, context)
}
private fun completeCallForArgument(
expression: KtExpression,
context: BasicCallResolutionContext
): OverloadResolutionResultsImpl<*>? {
val cachedData = getResolutionResultsCachedData(expression, context) ?: return null
val (cachedResolutionResults, cachedContext, tracing) = cachedData
val contextForArgument = cachedContext.replaceBindingTrace(context.trace)
.replaceExpectedType(context.expectedType).replaceCollectAllCandidates(false).replaceCallPosition(context.callPosition)
return completeCall(contextForArgument, cachedResolutionResults, tracing)
}
private fun updateRecordedTypeForArgument(
updatedType: KotlinType?,
recordedType: KotlinType?,
argumentExpression: KtExpression,
statementFilter: StatementFilter,
trace: BindingTrace
): KotlinType? {
//workaround for KT-8218
if ((!ErrorUtils.containsErrorType(recordedType) && recordedType == updatedType) || updatedType == null) return updatedType
fun deparenthesizeOrGetSelector(expression: KtExpression?): KtExpression? {
val deparenthesized = KtPsiUtil.deparenthesizeOnce(expression)
if (deparenthesized != expression) return deparenthesized
// see KtPsiUtil.getLastElementDeparenthesized
if (expression is KtBlockExpression) {
return statementFilter.getLastStatementInABlock(expression)
}
return (expression as? KtQualifiedExpression)?.selectorExpression
}
val expressions = ArrayList()
var expression: KtExpression? = argumentExpression
while (expression != null) {
expressions.add(expression)
expression = deparenthesizeOrGetSelector(expression)
}
var shouldBeMadeNullable = false
expressions.asReversed().forEach { expression ->
if (!(expression is KtParenthesizedExpression || expression is KtLabeledExpression || expression is KtAnnotatedExpression)) {
shouldBeMadeNullable = hasNecessarySafeCall(expression, trace)
}
BindingContextUtils.updateRecordedType(updatedType, expression, trace, shouldBeMadeNullable)
}
return trace.getType(argumentExpression)
}
private fun hasNecessarySafeCall(expression: KtExpression, trace: BindingTrace): Boolean {
// We are interested in type of the last call:
// 'a.b?.foo()' is safe call, but 'a?.b.foo()' is not.
// Since receiver is 'a.b' and selector is 'foo()',
// we can only check if an expression is safe call.
if (expression !is KtSafeQualifiedExpression) return false
//If a receiver type is not null, then this safe expression is useless, and we don't need to make the result type nullable.
val expressionType = trace.getType(expression.receiverExpression)
return expressionType != null && TypeUtils.isNullableType(expressionType)
}
}
