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/*
* Copyright 2010-2016 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.results;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
import org.jetbrains.kotlin.config.LanguageFeature;
import org.jetbrains.kotlin.config.LanguageVersionSettings;
import org.jetbrains.kotlin.descriptors.CallableDescriptor;
import org.jetbrains.kotlin.descriptors.ModuleDescriptor;
import org.jetbrains.kotlin.resolve.BindingTrace;
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
import org.jetbrains.kotlin.resolve.calls.util.CallUtilKt;
import org.jetbrains.kotlin.resolve.calls.context.CallResolutionContext;
import org.jetbrains.kotlin.resolve.calls.context.CheckArgumentTypesMode;
import org.jetbrains.kotlin.resolve.calls.model.MutableResolvedCall;
import org.jetbrains.kotlin.resolve.calls.tasks.TracingStrategy;
import org.jetbrains.kotlin.resolve.calls.tower.TowerUtilsKt;
import org.jetbrains.kotlin.resolve.descriptorUtil.AnnotationsForResolveKt;
import org.jetbrains.kotlin.types.checker.KotlinTypeRefiner;
import org.jetbrains.kotlin.util.CancellationChecker;
import java.util.*;
import java.util.stream.Collectors;
import static org.jetbrains.kotlin.resolve.calls.results.ResolutionStatus.*;
public class ResolutionResultsHandler {
private final OverloadingConflictResolver> overloadingConflictResolver;
public ResolutionResultsHandler(
@NotNull KotlinBuiltIns builtIns,
@NotNull ModuleDescriptor module,
@NotNull TypeSpecificityComparator specificityComparator,
@NotNull PlatformOverloadsSpecificityComparator platformOverloadsSpecificityComparator,
@NotNull CancellationChecker cancellationChecker,
@NotNull KotlinTypeRefiner kotlinTypeRefiner
) {
overloadingConflictResolver = FlatSignatureForResolvedCallKt.createOverloadingConflictResolver(
builtIns, module, specificityComparator, platformOverloadsSpecificityComparator, cancellationChecker, kotlinTypeRefiner
);
}
@NotNull
public OverloadResolutionResultsImpl computeResultAndReportErrors(
@NotNull CallResolutionContext context,
@NotNull TracingStrategy tracing,
@NotNull Collection> candidates,
@NotNull LanguageVersionSettings languageVersionSettings
) {
Set> successfulCandidates = new LinkedHashSet<>();
Set> failedCandidates = new LinkedHashSet<>();
Set> incompleteCandidates = new LinkedHashSet<>();
Set> candidatesWithWrongReceiver = new LinkedHashSet<>();
for (MutableResolvedCall candidateCall : candidates) {
ResolutionStatus status = candidateCall.getStatus();
assert status != UNKNOWN_STATUS : "No resolution for " + candidateCall.getCandidateDescriptor();
if (status.isSuccess()) {
successfulCandidates.add(candidateCall);
}
else if (status == INCOMPLETE_TYPE_INFERENCE) {
incompleteCandidates.add(candidateCall);
}
else if (candidateCall.getStatus() == RECEIVER_TYPE_ERROR) {
candidatesWithWrongReceiver.add(candidateCall);
}
else if (candidateCall.getStatus() != RECEIVER_PRESENCE_ERROR) {
failedCandidates.add(candidateCall);
}
}
// TODO : maybe it's better to filter overrides out first, and only then look for the maximally specific
if (!successfulCandidates.isEmpty() || !incompleteCandidates.isEmpty()) {
return computeSuccessfulResult(
context, tracing, successfulCandidates, incompleteCandidates, context.checkArguments, languageVersionSettings);
}
else if (!failedCandidates.isEmpty()) {
return computeFailedResult(tracing, context.trace, failedCandidates, context.checkArguments, languageVersionSettings);
}
if (!candidatesWithWrongReceiver.isEmpty()) {
tracing.unresolvedReferenceWrongReceiver(context.trace, candidatesWithWrongReceiver);
return OverloadResolutionResultsImpl.candidatesWithWrongReceiver(candidatesWithWrongReceiver);
}
tracing.unresolvedReference(context.trace);
return OverloadResolutionResultsImpl.nameNotFound();
}
@NotNull
private OverloadResolutionResultsImpl computeSuccessfulResult(
@NotNull CallResolutionContext context,
@NotNull TracingStrategy tracing,
@NotNull Set> successfulCandidates,
@NotNull Set> incompleteCandidates,
@NotNull CheckArgumentTypesMode checkArgumentsMode,
@NotNull LanguageVersionSettings languageVersionSettings
) {
Set> successfulAndIncomplete = new LinkedHashSet<>();
successfulAndIncomplete.addAll(successfulCandidates);
successfulAndIncomplete.addAll(incompleteCandidates);
OverloadResolutionResultsImpl results = chooseAndReportMaximallySpecific(
successfulAndIncomplete, true, checkArgumentsMode, languageVersionSettings);
if (results.isSingleResult()) {
MutableResolvedCall resultingCall = results.getResultingCall();
resultingCall.getTrace().moveAllMyDataTo(context.trace);
if (resultingCall.getStatus() == INCOMPLETE_TYPE_INFERENCE) {
return OverloadResolutionResultsImpl.incompleteTypeInference(resultingCall);
}
}
if (results.isAmbiguity()) {
tracing.recordAmbiguity(context.trace, results.getResultingCalls());
boolean allCandidatesIncomplete = allIncomplete(results.getResultingCalls());
// This check is needed for the following case:
// x.foo(unresolved) -- if there are multiple foo's, we'd report an ambiguity, and it does not make sense here
if (context.checkArguments != CheckArgumentTypesMode.CHECK_VALUE_ARGUMENTS ||
!CallUtilKt.hasUnresolvedArguments(context.call, context)) {
if (allCandidatesIncomplete) {
tracing.cannotCompleteResolve(context.trace, results.getResultingCalls());
}
else {
tracing.ambiguity(context.trace, results.getResultingCalls());
}
}
if (allCandidatesIncomplete) {
return OverloadResolutionResultsImpl.incompleteTypeInference(results.getResultingCalls());
}
}
return results;
}
@NotNull
private OverloadResolutionResultsImpl computeFailedResult(
@NotNull TracingStrategy tracing,
@NotNull BindingTrace trace,
@NotNull Set> failedCandidates,
@NotNull CheckArgumentTypesMode checkArgumentsMode,
@NotNull LanguageVersionSettings languageVersionSettings
) {
if (failedCandidates.size() == 1) {
return recordFailedInfo(tracing, trace, failedCandidates);
}
for (EnumSet severityLevel : SEVERITY_LEVELS) {
Set> thisLevel = new LinkedHashSet<>();
for (MutableResolvedCall candidate : failedCandidates) {
if (severityLevel.contains(candidate.getStatus())) {
thisLevel.add(candidate);
}
}
if (!thisLevel.isEmpty()) {
if (severityLevel.contains(ARGUMENTS_MAPPING_ERROR)) {
@SuppressWarnings("unchecked")
OverloadingConflictResolver> myResolver = (OverloadingConflictResolver) overloadingConflictResolver;
return recordFailedInfo(tracing, trace, myResolver.filterOutEquivalentCalls(new LinkedHashSet<>(thisLevel)));
}
OverloadResolutionResultsImpl results = chooseAndReportMaximallySpecific(
thisLevel, false, checkArgumentsMode, languageVersionSettings);
return recordFailedInfo(tracing, trace, results.getResultingCalls());
}
}
throw new AssertionError("Should not be reachable, cause every status must belong to some level: " + failedCandidates);
}
@NotNull
private static OverloadResolutionResultsImpl recordFailedInfo(
@NotNull TracingStrategy tracing,
@NotNull BindingTrace trace,
@NotNull Collection> candidates
) {
if (candidates.size() == 1) {
MutableResolvedCall failed = candidates.iterator().next();
failed.getTrace().moveAllMyDataTo(trace);
return OverloadResolutionResultsImpl.singleFailedCandidate(failed);
}
tracing.noneApplicable(trace, candidates);
tracing.recordAmbiguity(trace, candidates);
return OverloadResolutionResultsImpl.manyFailedCandidates(candidates);
}
private static boolean allIncomplete(@NotNull Collection> results) {
for (MutableResolvedCall result : results) {
if (result.getStatus() != INCOMPLETE_TYPE_INFERENCE) return false;
}
return true;
}
@NotNull
@SuppressWarnings("unchecked")
private OverloadResolutionResultsImpl chooseAndReportMaximallySpecific(
@NotNull Set> candidates,
boolean discriminateGenerics,
@NotNull CheckArgumentTypesMode checkArgumentsMode,
@NotNull LanguageVersionSettings languageVersionSettings
) {
OverloadingConflictResolver> myResolver = (OverloadingConflictResolver) overloadingConflictResolver;
Set> refinedCandidates = candidates;
if (!languageVersionSettings.supportsFeature(LanguageFeature.RefinedSamAdaptersPriority)) {
Set> nonSynthesized = new HashSet<>();
for (MutableResolvedCall candidate : candidates) {
if (!TowerUtilsKt.isSynthesized(candidate.getCandidateDescriptor())) {
nonSynthesized.add(candidate);
}
}
if (!nonSynthesized.isEmpty()) {
refinedCandidates = nonSynthesized;
}
}
Set> specificCalls =
myResolver.chooseMaximallySpecificCandidates(refinedCandidates, checkArgumentsMode, discriminateGenerics);
if (specificCalls.size() > 1) {
specificCalls = specificCalls.stream()
.filter((call) ->
!call.getCandidateDescriptor().getAnnotations().hasAnnotation(
AnnotationsForResolveKt.getOVERLOAD_RESOLUTION_BY_LAMBDA_ANNOTATION_FQ_NAME())
).collect(Collectors.toSet());
}
if (specificCalls.size() == 1) {
return OverloadResolutionResultsImpl.success(specificCalls.iterator().next());
}
else {
return OverloadResolutionResultsImpl.ambiguity(specificCalls);
}
}
}