Ejemplo n.º 1
0
  @NotNull
  private <D extends CallableDescriptor, F extends D>
      OverloadResolutionResultsImpl<F> performResolutionGuardedForExtraFunctionLiteralArguments(
          @NotNull ResolutionTask<D, F> task, @NotNull CallTransformer<D, F> callTransformer) {
    OverloadResolutionResultsImpl<F> results = performResolution(task, callTransformer);

    // If resolution fails, we should check for some of the following situations:
    //   class A {
    //     val foo = Bar() // The following is intended to be an anonymous initializer,
    //                     // but is treated as a function literal argument
    //     {
    //       ...
    //     }
    //  }
    //
    //  fun foo() {
    //    bar {
    //      buzz()
    //      {...} // intended to be a returned from the outer literal
    //    }
    //  }
    ImmutableSet<OverloadResolutionResults.Code> someFailed =
        ImmutableSet.of(MANY_FAILED_CANDIDATES, SINGLE_CANDIDATE_ARGUMENT_MISMATCH);
    if (someFailed.contains(results.getResultCode())
        && !task.call.getFunctionLiteralArguments().isEmpty()
        && task.contextDependency
            == ContextDependency.INDEPENDENT) { // For nested calls there are no such cases
      // We have some candidates that failed for some reason
      // And we have a suspect: the function literal argument
      // Now, we try to remove this argument and see if it helps
      DelegatingCall callWithoutFLArgs =
          new DelegatingCall(task.call) {
            @NotNull
            @Override
            public List<JetExpression> getFunctionLiteralArguments() {
              return Collections.emptyList();
            }
          };
      TemporaryBindingTrace temporaryTrace =
          TemporaryBindingTrace.create(
              task.trace, "trace for resolution guarded for extra function literal arguments");
      ResolutionTask<D, F> newTask =
          task.replaceBindingTrace(temporaryTrace).replaceCall(callWithoutFLArgs);

      OverloadResolutionResultsImpl<F> resultsWithFunctionLiteralsStripped =
          performResolution(newTask, callTransformer);
      if (resultsWithFunctionLiteralsStripped.isSuccess()
          || resultsWithFunctionLiteralsStripped.isAmbiguity()) {
        task.tracing.danglingFunctionLiteralArgumentSuspected(
            task.trace, task.call.getFunctionLiteralArguments());
      }
    }

    return results;
  }
Ejemplo n.º 2
0
  @NotNull
  private <D extends CallableDescriptor, F extends D>
      OverloadResolutionResultsImpl<F> performResolution(
          @NotNull ResolutionTask<D, F> task, @NotNull CallTransformer<D, F> callTransformer) {

    for (ResolutionCandidate<D> resolutionCandidate : task.getCandidates()) {
      TemporaryBindingTrace candidateTrace =
          TemporaryBindingTrace.create(task.trace, "trace to resolve candidate");
      Collection<CallCandidateResolutionContext<D>> contexts =
          callTransformer.createCallContexts(resolutionCandidate, task, candidateTrace);
      for (CallCandidateResolutionContext<D> context : contexts) {

        candidateResolver.performResolutionForCandidateCall(context, task);

        /* important for 'variable as function case': temporary bind reference to descriptor (will be rewritten)
        to have a binding to variable while 'invoke' call resolve */
        task.tracing.bindReference(context.candidateCall.getTrace(), context.candidateCall);

        Collection<ResolvedCallWithTrace<F>> calls =
            callTransformer.transformCall(context, this, task);

        for (ResolvedCallWithTrace<F> call : calls) {
          task.tracing.bindReference(call.getTrace(), call);
          task.tracing.bindResolvedCall(call.getTrace(), call);
          task.getResolvedCalls().add(call);
        }
      }
    }

    OverloadResolutionResultsImpl<F> results =
        ResolutionResultsHandler.INSTANCE.computeResultAndReportErrors(
            task.trace, task.tracing, task.getResolvedCalls());
    if (!results.isSingleResult() && !results.isIncomplete()) {
      argumentTypeResolver.checkTypesWithNoCallee(task.toBasic());
    }
    return results;
  }
Ejemplo n.º 3
0
  @NotNull
  private <D extends CallableDescriptor, F extends D>
      OverloadResolutionResultsImpl<F> doResolveCall(
          @NotNull BasicCallResolutionContext context,
          @NotNull List<ResolutionTask<D, F>> prioritizedTasks, // high to low priority
          @NotNull CallTransformer<D, F> callTransformer,
          @NotNull JetReferenceExpression reference) {

    ResolutionDebugInfo.Data debugInfo = ResolutionDebugInfo.create();
    context.trace.record(
        ResolutionDebugInfo.RESOLUTION_DEBUG_INFO, context.call.getCallElement(), debugInfo);
    context.trace.record(RESOLUTION_SCOPE, context.call.getCalleeExpression(), context.scope);

    if (context.dataFlowInfo.hasTypeInfoConstraints()) {
      context.trace.record(
          NON_DEFAULT_EXPRESSION_DATA_FLOW,
          context.call.getCalleeExpression(),
          context.dataFlowInfo);
    }

    debugInfo.set(ResolutionDebugInfo.TASKS, prioritizedTasks);

    if (context.checkArguments == CheckValueArgumentsMode.ENABLED) {
      argumentTypeResolver.analyzeArgumentsAndRecordTypes(context);
    }

    TemporaryBindingTrace traceForFirstNonemptyCandidateSet = null;
    OverloadResolutionResultsImpl<F> resultsForFirstNonemptyCandidateSet = null;
    for (ResolutionTask<D, F> task : prioritizedTasks) {
      TemporaryBindingTrace taskTrace =
          TemporaryBindingTrace.create(
              context.trace, "trace to resolve a task for", task.reference);
      OverloadResolutionResultsImpl<F> results =
          performResolutionGuardedForExtraFunctionLiteralArguments(
              task.replaceBindingTrace(taskTrace), callTransformer);
      if (results.isSuccess() || results.isAmbiguity()) {
        taskTrace.commit();

        if (results.isSuccess()) {
          debugInfo.set(ResolutionDebugInfo.RESULT, results.getResultingCall());
        }

        resolveFunctionArguments(context, results);
        return results;
      }
      if (results.getResultCode() == INCOMPLETE_TYPE_INFERENCE) {
        results.setTrace(taskTrace);
        return results;
      }
      boolean updateResults =
          traceForFirstNonemptyCandidateSet == null
              || (resultsForFirstNonemptyCandidateSet.getResultCode()
                      == CANDIDATES_WITH_WRONG_RECEIVER
                  && results.getResultCode() != CANDIDATES_WITH_WRONG_RECEIVER);
      if (!task.getCandidates().isEmpty() && !results.isNothing() && updateResults) {
        traceForFirstNonemptyCandidateSet = taskTrace;
        resultsForFirstNonemptyCandidateSet = results;
      }
    }
    if (traceForFirstNonemptyCandidateSet != null) {
      traceForFirstNonemptyCandidateSet.commit();
      if (resultsForFirstNonemptyCandidateSet.isSingleResult()) {

        debugInfo.set(
            ResolutionDebugInfo.RESULT, resultsForFirstNonemptyCandidateSet.getResultingCall());
      }
      resolveFunctionArguments(context, resultsForFirstNonemptyCandidateSet);
    } else {
      context.trace.report(UNRESOLVED_REFERENCE.on(reference, reference));
      argumentTypeResolver.checkTypesWithNoCallee(context, RESOLVE_FUNCTION_ARGUMENTS);
    }
    return resultsForFirstNonemptyCandidateSet != null
        ? resultsForFirstNonemptyCandidateSet
        : OverloadResolutionResultsImpl.<F>nameNotFound();
  }
Ejemplo n.º 4
0
  @NotNull
  /*package*/ OverloadResolutionResultsImpl<FunctionDescriptor> resolveFunctionCall(
      @NotNull BasicCallResolutionContext context) {

    ProgressIndicatorProvider.checkCanceled();

    List<ResolutionTask<CallableDescriptor, FunctionDescriptor>> prioritizedTasks;

    JetExpression calleeExpression = context.call.getCalleeExpression();
    JetReferenceExpression functionReference;
    if (calleeExpression instanceof JetSimpleNameExpression) {
      JetSimpleNameExpression expression = (JetSimpleNameExpression) calleeExpression;
      functionReference = expression;

      ExpressionTypingUtils.checkCapturingInClosure(expression, context.trace, context.scope);

      Name name = expression.getReferencedNameAsName();

      prioritizedTasks =
          TaskPrioritizer.<CallableDescriptor, FunctionDescriptor>computePrioritizedTasks(
              context,
              name,
              functionReference,
              CallableDescriptorCollectors.FUNCTIONS_AND_VARIABLES);
      ResolutionTask.DescriptorCheckStrategy abstractConstructorCheck =
          new ResolutionTask.DescriptorCheckStrategy() {
            @Override
            public <D extends CallableDescriptor> boolean performAdvancedChecks(
                D descriptor, BindingTrace trace, TracingStrategy tracing) {
              if (descriptor instanceof ConstructorDescriptor) {
                Modality modality =
                    ((ConstructorDescriptor) descriptor).getContainingDeclaration().getModality();
                if (modality == Modality.ABSTRACT) {
                  tracing.instantiationOfAbstractClass(trace);
                  return false;
                }
              }
              return true;
            }
          };
      for (ResolutionTask task : prioritizedTasks) {
        task.setCheckingStrategy(abstractConstructorCheck);
      }
    } else {
      JetValueArgumentList valueArgumentList = context.call.getValueArgumentList();
      PsiElement reportAbsenceOn =
          valueArgumentList == null ? context.call.getCallElement() : valueArgumentList;
      if (calleeExpression instanceof JetConstructorCalleeExpression) {
        assert !context.call.getExplicitReceiver().exists();

        JetConstructorCalleeExpression expression =
            (JetConstructorCalleeExpression) calleeExpression;
        functionReference = expression.getConstructorReferenceExpression();
        if (functionReference == null) {
          return checkArgumentTypesAndFail(context); // No type there
        }
        JetTypeReference typeReference = expression.getTypeReference();
        assert typeReference != null;
        JetType constructedType =
            typeResolver.resolveType(context.scope, typeReference, context.trace, true);

        if (constructedType.isError()) {
          return checkArgumentTypesAndFail(context);
        }

        DeclarationDescriptor declarationDescriptor =
            constructedType.getConstructor().getDeclarationDescriptor();
        if (declarationDescriptor instanceof ClassDescriptor) {
          ClassDescriptor classDescriptor = (ClassDescriptor) declarationDescriptor;
          Collection<ConstructorDescriptor> constructors = classDescriptor.getConstructors();
          if (constructors.isEmpty()) {
            context.trace.report(NO_CONSTRUCTOR.on(reportAbsenceOn));
            return checkArgumentTypesAndFail(context);
          }
          Collection<ResolutionCandidate<CallableDescriptor>> candidates =
              TaskPrioritizer.<CallableDescriptor>convertWithImpliedThis(
                  context.scope,
                  Collections.<ReceiverValue>singletonList(NO_RECEIVER),
                  constructors);
          prioritizedTasks =
              TaskPrioritizer
                  .<CallableDescriptor, FunctionDescriptor>computePrioritizedTasksFromCandidates(
                      context, functionReference, candidates, null);
        } else {
          context.trace.report(NOT_A_CLASS.on(calleeExpression));
          return checkArgumentTypesAndFail(context);
        }
      } else if (calleeExpression instanceof JetThisReferenceExpression) {
        functionReference = (JetThisReferenceExpression) calleeExpression;
        DeclarationDescriptor containingDeclaration = context.scope.getContainingDeclaration();
        if (containingDeclaration instanceof ConstructorDescriptor) {
          containingDeclaration = containingDeclaration.getContainingDeclaration();
        }
        assert containingDeclaration instanceof ClassDescriptor;
        ClassDescriptor classDescriptor = (ClassDescriptor) containingDeclaration;

        Collection<ConstructorDescriptor> constructors = classDescriptor.getConstructors();
        if (constructors.isEmpty()) {
          context.trace.report(NO_CONSTRUCTOR.on(reportAbsenceOn));
          return checkArgumentTypesAndFail(context);
        }
        List<ResolutionCandidate<CallableDescriptor>> candidates =
            ResolutionCandidate.<CallableDescriptor>convertCollection(
                constructors, JetPsiUtil.isSafeCall(context.call));
        prioritizedTasks =
            Collections.singletonList(
                new ResolutionTask<CallableDescriptor, FunctionDescriptor>(
                    candidates, functionReference, context)); // !! DataFlowInfo.EMPTY
      } else if (calleeExpression != null) {
        // Here we handle the case where the callee expression must be something of type function,
        // e.g. (foo.bar())(1, 2)
        JetType calleeType =
            expressionTypingServices.safeGetType(
                context.scope,
                calleeExpression,
                NO_EXPECTED_TYPE,
                context.dataFlowInfo,
                context
                    .trace); // We are actually expecting a function, but there seems to be no easy
                             // way of expressing this

        if (!KotlinBuiltIns.getInstance().isFunctionOrExtensionFunctionType(calleeType)) {
          //                    checkTypesWithNoCallee(trace, scope, call);
          if (!calleeType.isError()) {
            context.trace.report(CALLEE_NOT_A_FUNCTION.on(calleeExpression, calleeType));
          }
          return checkArgumentTypesAndFail(context);
        }

        FunctionDescriptorImpl functionDescriptor =
            new ExpressionAsFunctionDescriptor(
                context.scope.getContainingDeclaration(),
                Name.special("<for expression " + calleeExpression.getText() + ">"),
                calleeExpression);
        FunctionDescriptorUtil.initializeFromFunctionType(
            functionDescriptor,
            calleeType,
            NO_RECEIVER_PARAMETER,
            Modality.FINAL,
            Visibilities.LOCAL);
        ResolutionCandidate<CallableDescriptor> resolutionCandidate =
            ResolutionCandidate.<CallableDescriptor>create(
                functionDescriptor, JetPsiUtil.isSafeCall(context.call));
        resolutionCandidate.setReceiverArgument(context.call.getExplicitReceiver());
        resolutionCandidate.setExplicitReceiverKind(ExplicitReceiverKind.RECEIVER_ARGUMENT);

        // strictly speaking, this is a hack:
        // we need to pass a reference, but there's no reference in the PSI,
        // so we wrap what we have into a fake reference and pass it on (unwrap on the other end)
        functionReference = new JetFakeReference(calleeExpression);

        prioritizedTasks =
            Collections.singletonList(
                new ResolutionTask<CallableDescriptor, FunctionDescriptor>(
                    Collections.singleton(resolutionCandidate), functionReference, context));
      } else {
        //                checkTypesWithNoCallee(trace, scope, call);
        return checkArgumentTypesAndFail(context);
      }
    }

    return doResolveCallOrGetCachedResults(
        ResolutionResultsCache.FUNCTION_MEMBER_TYPE,
        context,
        prioritizedTasks,
        CallTransformer.FUNCTION_CALL_TRANSFORMER,
        functionReference);
  }