001 /*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.jet.lang.types.expressions;
018
019 import com.google.common.collect.Lists;
020 import com.intellij.psi.PsiElement;
021 import com.intellij.psi.tree.IElementType;
022 import com.intellij.psi.tree.TokenSet;
023 import org.jetbrains.annotations.NotNull;
024 import org.jetbrains.annotations.Nullable;
025 import org.jetbrains.jet.lang.descriptors.*;
026 import org.jetbrains.jet.lang.descriptors.annotations.Annotations;
027 import org.jetbrains.jet.lang.descriptors.impl.AnonymousFunctionDescriptor;
028 import org.jetbrains.jet.lang.diagnostics.Diagnostic;
029 import org.jetbrains.jet.lang.diagnostics.Errors;
030 import org.jetbrains.jet.lang.evaluate.ConstantExpressionEvaluator;
031 import org.jetbrains.jet.lang.psi.*;
032 import org.jetbrains.jet.lang.resolve.*;
033 import org.jetbrains.jet.lang.resolve.calls.ArgumentTypeResolver;
034 import org.jetbrains.jet.lang.resolve.calls.CallExpressionResolver;
035 import org.jetbrains.jet.lang.resolve.calls.autocasts.DataFlowInfo;
036 import org.jetbrains.jet.lang.resolve.calls.autocasts.DataFlowValue;
037 import org.jetbrains.jet.lang.resolve.calls.autocasts.DataFlowValueFactory;
038 import org.jetbrains.jet.lang.resolve.calls.autocasts.Nullability;
039 import org.jetbrains.jet.lang.resolve.calls.context.BasicCallResolutionContext;
040 import org.jetbrains.jet.lang.resolve.calls.context.CheckValueArgumentsMode;
041 import org.jetbrains.jet.lang.resolve.calls.context.TemporaryTraceAndCache;
042 import org.jetbrains.jet.lang.resolve.calls.model.DataFlowInfoForArgumentsImpl;
043 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall;
044 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCallImpl;
045 import org.jetbrains.jet.lang.resolve.calls.model.VariableAsFunctionResolvedCall;
046 import org.jetbrains.jet.lang.resolve.calls.results.OverloadResolutionResults;
047 import org.jetbrains.jet.lang.resolve.calls.results.OverloadResolutionResultsImpl;
048 import org.jetbrains.jet.lang.resolve.calls.results.OverloadResolutionResultsUtil;
049 import org.jetbrains.jet.lang.resolve.calls.tasks.ExplicitReceiverKind;
050 import org.jetbrains.jet.lang.resolve.calls.tasks.ResolutionCandidate;
051 import org.jetbrains.jet.lang.resolve.calls.tasks.TracingStrategy;
052 import org.jetbrains.jet.lang.resolve.calls.util.CallMaker;
053 import org.jetbrains.jet.lang.resolve.constants.CompileTimeConstant;
054 import org.jetbrains.jet.lang.resolve.constants.CompileTimeConstantChecker;
055 import org.jetbrains.jet.lang.resolve.constants.IntegerValueTypeConstant;
056 import org.jetbrains.jet.lang.resolve.name.LabelName;
057 import org.jetbrains.jet.lang.resolve.name.Name;
058 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
059 import org.jetbrains.jet.lang.resolve.scopes.WritableScopeImpl;
060 import org.jetbrains.jet.lang.resolve.scopes.receivers.ExpressionReceiver;
061 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverValue;
062 import org.jetbrains.jet.lang.resolve.scopes.receivers.TransientReceiver;
063 import org.jetbrains.jet.lang.types.*;
064 import org.jetbrains.jet.lang.types.checker.JetTypeChecker;
065 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
066 import org.jetbrains.jet.lexer.JetTokens;
067 import org.jetbrains.jet.util.slicedmap.WritableSlice;
068 import org.jetbrains.jet.utils.ThrowingList;
069
070 import java.util.Collection;
071 import java.util.Collections;
072 import java.util.List;
073
074 import static org.jetbrains.jet.lang.descriptors.ReceiverParameterDescriptor.NO_RECEIVER_PARAMETER;
075 import static org.jetbrains.jet.lang.diagnostics.Errors.*;
076 import static org.jetbrains.jet.lang.resolve.BindingContext.*;
077 import static org.jetbrains.jet.lang.resolve.DescriptorUtils.getStaticNestedClassesScope;
078 import static org.jetbrains.jet.lang.resolve.calls.context.ContextDependency.INDEPENDENT;
079 import static org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverValue.NO_RECEIVER;
080 import static org.jetbrains.jet.lang.types.TypeUtils.NO_EXPECTED_TYPE;
081 import static org.jetbrains.jet.lang.types.TypeUtils.noExpectedType;
082 import static org.jetbrains.jet.lang.types.expressions.ControlStructureTypingUtils.createCallForSpecialConstruction;
083 import static org.jetbrains.jet.lang.types.expressions.ExpressionTypingUtils.*;
084 import static org.jetbrains.jet.lang.types.expressions.TypeReconstructionUtil.reconstructBareType;
085 import static org.jetbrains.jet.lexer.JetTokens.AS_KEYWORD;
086 import static org.jetbrains.jet.lexer.JetTokens.AS_SAFE;
087
088 @SuppressWarnings("SuspiciousMethodCalls")
089 public class BasicExpressionTypingVisitor extends ExpressionTypingVisitor {
090
091 private static final TokenSet BARE_TYPES_ALLOWED = TokenSet.create(AS_KEYWORD, AS_SAFE);
092
093 protected BasicExpressionTypingVisitor(@NotNull ExpressionTypingInternals facade) {
094 super(facade);
095 }
096
097 @Override
098 public JetTypeInfo visitSimpleNameExpression(@NotNull JetSimpleNameExpression expression, ExpressionTypingContext context) {
099 // TODO : other members
100 // TODO : type substitutions???
101 CallExpressionResolver callExpressionResolver = components.expressionTypingServices.getCallExpressionResolver();
102 JetTypeInfo typeInfo = callExpressionResolver.getSimpleNameExpressionTypeInfo(expression, NO_RECEIVER, null, context);
103 JetType type = DataFlowUtils.checkType(typeInfo.getType(), expression, context);
104 ExpressionTypingUtils.checkCapturingInClosure(expression, context.trace, context.scope);
105 return JetTypeInfo.create(type, typeInfo.getDataFlowInfo()); // TODO : Extensions to this
106 }
107
108 @Override
109 public JetTypeInfo visitParenthesizedExpression(@NotNull JetParenthesizedExpression expression, ExpressionTypingContext context) {
110 return visitParenthesizedExpression(expression, context, false);
111 }
112
113 public JetTypeInfo visitParenthesizedExpression(JetParenthesizedExpression expression, ExpressionTypingContext context, boolean isStatement) {
114 JetExpression innerExpression = expression.getExpression();
115 if (innerExpression == null) {
116 return JetTypeInfo.create(null, context.dataFlowInfo);
117 }
118 return facade.getTypeInfo(innerExpression, context.replaceScope(context.scope), isStatement);
119 }
120
121 @Override
122 public JetTypeInfo visitConstantExpression(@NotNull JetConstantExpression expression, ExpressionTypingContext context) {
123 CompileTimeConstant<?> value = ConstantExpressionEvaluator.object$.evaluate(expression, context.trace, context.expectedType);
124
125 if (!(value instanceof IntegerValueTypeConstant)) {
126 CompileTimeConstantChecker compileTimeConstantChecker = context.getCompileTimeConstantChecker();
127 boolean hasError = compileTimeConstantChecker.checkConstantExpressionType(value, expression, context.expectedType);
128 if (hasError) {
129 IElementType elementType = expression.getNode().getElementType();
130 return JetTypeInfo.create(getDefaultType(elementType), context.dataFlowInfo);
131 }
132 }
133
134 assert value != null : "CompileTimeConstant should be evaluated for constant expression or an error should be recorded " + expression.getText();
135 return createCompileTimeConstantTypeInfo(value, expression, context);
136 }
137
138 @Override
139 public JetTypeInfo visitBinaryWithTypeRHSExpression(@NotNull JetBinaryExpressionWithTypeRHS expression, ExpressionTypingContext context) {
140 ExpressionTypingContext contextWithNoExpectedType =
141 context.replaceExpectedType(NO_EXPECTED_TYPE).replaceContextDependency(INDEPENDENT);
142 JetExpression left = expression.getLeft();
143 JetTypeReference right = expression.getRight();
144 if (right == null) {
145 JetTypeInfo leftTypeInfo = facade.getTypeInfo(left, contextWithNoExpectedType);
146 return JetTypeInfo.create(null, leftTypeInfo.getDataFlowInfo());
147 }
148
149 IElementType operationType = expression.getOperationReference().getReferencedNameElementType();
150
151 boolean allowBareTypes = BARE_TYPES_ALLOWED.contains(operationType);
152 TypeResolutionContext typeResolutionContext = new TypeResolutionContext(context.scope, context.trace, true, allowBareTypes);
153 PossiblyBareType possiblyBareTarget = components.expressionTypingServices.getTypeResolver().resolvePossiblyBareType(typeResolutionContext, right);
154
155 if (operationType == JetTokens.COLON) {
156 // We do not allow bare types on static assertions, because static assertions provide an expected type for their argument,
157 // thus causing a circularity in type dependencies
158 assert !possiblyBareTarget.isBare() : "Bare types should not be allowed for static assertions, because argument inference makes no sense there";
159 JetType targetType = possiblyBareTarget.getActualType();
160
161 JetTypeInfo typeInfo = facade.getTypeInfo(left, contextWithNoExpectedType.replaceExpectedType(targetType));
162 checkBinaryWithTypeRHS(expression, context, targetType, typeInfo.getType());
163 return DataFlowUtils.checkType(targetType, expression, context, typeInfo.getDataFlowInfo());
164 }
165
166 JetTypeInfo typeInfo = facade.getTypeInfo(left, contextWithNoExpectedType);
167
168 DataFlowInfo dataFlowInfo = context.dataFlowInfo;
169 JetType subjectType = typeInfo.getType();
170 JetType targetType = reconstructBareType(right, possiblyBareTarget, subjectType, context.trace);
171
172 if (subjectType != null) {
173 checkBinaryWithTypeRHS(expression, contextWithNoExpectedType, targetType, subjectType);
174 dataFlowInfo = typeInfo.getDataFlowInfo();
175 if (operationType == AS_KEYWORD) {
176 DataFlowValue value = DataFlowValueFactory.createDataFlowValue(left, subjectType, context.trace.getBindingContext());
177 dataFlowInfo = dataFlowInfo.establishSubtyping(value, targetType);
178 }
179 }
180
181 JetType result = operationType == AS_SAFE ? TypeUtils.makeNullable(targetType) : targetType;
182 return DataFlowUtils.checkType(result, expression, context, dataFlowInfo);
183 }
184
185 private void checkBinaryWithTypeRHS(
186 @NotNull JetBinaryExpressionWithTypeRHS expression,
187 @NotNull ExpressionTypingContext context,
188 @NotNull JetType targetType,
189 @Nullable JetType actualType
190 ) {
191 if (actualType == null) return;
192 JetSimpleNameExpression operationSign = expression.getOperationReference();
193 IElementType operationType = operationSign.getReferencedNameElementType();
194 if (operationType == JetTokens.COLON) {
195 return;
196 }
197 if (operationType != JetTokens.AS_KEYWORD && operationType != JetTokens.AS_SAFE) {
198 context.trace.report(UNSUPPORTED.on(operationSign, "binary operation with type RHS"));
199 return;
200 }
201 checkForCastImpossibility(expression, actualType, targetType, context);
202 }
203
204 private void checkForCastImpossibility(
205 JetBinaryExpressionWithTypeRHS expression,
206 JetType actualType,
207 JetType targetType,
208 ExpressionTypingContext context
209 ) {
210 if (actualType == null || noExpectedType(targetType)) return;
211
212 if (!CastDiagnosticsUtil.isCastPossible(actualType, targetType, components.platformToKotlinClassMap)) {
213 context.trace.report(CAST_NEVER_SUCCEEDS.on(expression.getOperationReference()));
214 }
215 else {
216 JetTypeChecker typeChecker = JetTypeChecker.INSTANCE;
217 // Upcast?
218 if (typeChecker.isSubtypeOf(actualType, targetType)) {
219 if (!typeChecker.isSubtypeOf(targetType, actualType)) {
220 // proper upcast: String as Any
221 context.trace.report(USELESS_CAST_STATIC_ASSERT_IS_FINE.on(expression.getOperationReference()));
222 }
223 else {
224 // cast to itself: String as String
225 context.trace.report(USELESS_CAST.on(expression.getOperationReference()));
226 }
227 }
228 else if (CastDiagnosticsUtil.isCastErased(actualType, targetType, typeChecker)) {
229 context.trace.report(Errors.UNCHECKED_CAST.on(expression, actualType, targetType));
230 }
231 }
232 }
233
234 @Override
235 public JetTypeInfo visitThisExpression(@NotNull JetThisExpression expression, ExpressionTypingContext context) {
236 JetType result = null;
237 LabelResolver.LabeledReceiverResolutionResult resolutionResult = resolveToReceiver(expression, context, false);
238
239 switch (resolutionResult.getCode()) {
240 case LABEL_RESOLUTION_ERROR:
241 // Do nothing, the error is already reported
242 break;
243 case NO_THIS:
244 context.trace.report(NO_THIS.on(expression));
245 break;
246 case SUCCESS:
247 result = resolutionResult.getReceiverParameterDescriptor().getType();
248 context.trace.record(BindingContext.EXPRESSION_TYPE, expression.getInstanceReference(), result);
249 break;
250 }
251 return DataFlowUtils.checkType(result, expression, context, context.dataFlowInfo);
252 }
253
254 @Override
255 public JetTypeInfo visitSuperExpression(@NotNull JetSuperExpression expression, ExpressionTypingContext context) {
256 LabelResolver.LabeledReceiverResolutionResult resolutionResult = resolveToReceiver(expression, context, true);
257
258 if (!JetPsiUtil.isLHSOfDot(expression)) {
259 context.trace.report(SUPER_IS_NOT_AN_EXPRESSION.on(expression, expression.getText()));
260 return errorInSuper(expression, context);
261 }
262
263 switch (resolutionResult.getCode()) {
264 case LABEL_RESOLUTION_ERROR:
265 // The error is already reported
266 return errorInSuper(expression, context);
267 case NO_THIS:
268 context.trace.report(SUPER_NOT_AVAILABLE.on(expression));
269 return errorInSuper(expression, context);
270 case SUCCESS:
271 JetType result = checkPossiblyQualifiedSuper(expression, context, resolutionResult.getReceiverParameterDescriptor());
272 if (result != null) {
273 context.trace.record(BindingContext.EXPRESSION_TYPE, expression.getInstanceReference(), result);
274 }
275 return DataFlowUtils.checkType(result, expression, context, context.dataFlowInfo);
276 }
277 throw new IllegalStateException("Unknown code: " + resolutionResult.getCode());
278 }
279
280 private JetTypeInfo errorInSuper(JetSuperExpression expression, ExpressionTypingContext context) {
281 JetTypeReference superTypeQualifier = expression.getSuperTypeQualifier();
282 if (superTypeQualifier != null) {
283 components.expressionTypingServices.getTypeResolver().resolveType(context.scope, superTypeQualifier, context.trace, true);
284 }
285 return JetTypeInfo.create(null, context.dataFlowInfo);
286 }
287
288 private JetType checkPossiblyQualifiedSuper(
289 JetSuperExpression expression,
290 ExpressionTypingContext context,
291 ReceiverParameterDescriptor thisReceiver
292 ) {
293 JetType result = null;
294 JetType thisType = thisReceiver.getType();
295 Collection<JetType> supertypes = thisType.getConstructor().getSupertypes();
296 TypeSubstitutor substitutor = TypeSubstitutor.create(thisType);
297
298 JetTypeReference superTypeQualifier = expression.getSuperTypeQualifier();
299 if (superTypeQualifier != null) {
300 JetTypeElement typeElement = superTypeQualifier.getTypeElement();
301
302 DeclarationDescriptor classifierCandidate = null;
303 JetType supertype = null;
304 PsiElement redundantTypeArguments = null;
305 if (typeElement instanceof JetUserType) {
306 JetUserType userType = (JetUserType) typeElement;
307 // This may be just a superclass name even if the superclass is generic
308 if (userType.getTypeArguments().isEmpty()) {
309 classifierCandidate = components.expressionTypingServices.getTypeResolver().resolveClass(context.scope, userType, context.trace);
310 }
311 else {
312 supertype = components.expressionTypingServices.getTypeResolver().resolveType(context.scope, superTypeQualifier, context.trace, true);
313 redundantTypeArguments = userType.getTypeArgumentList();
314 }
315 }
316 else {
317 supertype = components.expressionTypingServices.getTypeResolver().resolveType(context.scope, superTypeQualifier, context.trace, true);
318 }
319
320 if (supertype != null) {
321 if (supertypes.contains(supertype)) {
322 result = supertype;
323 }
324 }
325 else if (classifierCandidate instanceof ClassDescriptor) {
326 ClassDescriptor superclass = (ClassDescriptor) classifierCandidate;
327
328 for (JetType declaredSupertype : supertypes) {
329 if (declaredSupertype.getConstructor().equals(superclass.getTypeConstructor())) {
330 result = substitutor.safeSubstitute(declaredSupertype, Variance.INVARIANT);
331 break;
332 }
333 }
334 }
335
336 boolean validClassifier = classifierCandidate != null && !ErrorUtils.isError(classifierCandidate);
337 boolean validType = supertype != null && !supertype.isError();
338 if (result == null && (validClassifier || validType)) {
339 context.trace.report(NOT_A_SUPERTYPE.on(superTypeQualifier));
340 }
341 else if (redundantTypeArguments != null) {
342 context.trace.report(TYPE_ARGUMENTS_REDUNDANT_IN_SUPER_QUALIFIER.on(redundantTypeArguments));
343 }
344 }
345 else {
346 if (supertypes.size() > 1) {
347 context.trace.report(AMBIGUOUS_SUPER.on(expression));
348 }
349 else {
350 // supertypes may be empty when all the supertypes are error types (are not resolved, for example)
351 JetType type = supertypes.isEmpty()
352 ? KotlinBuiltIns.getInstance().getAnyType()
353 : supertypes.iterator().next();
354 result = substitutor.substitute(type, Variance.INVARIANT);
355 }
356 }
357 if (result != null) {
358 if (DescriptorUtils.isTrait(thisType.getConstructor().getDeclarationDescriptor())) {
359 if (DescriptorUtils.isClass(result.getConstructor().getDeclarationDescriptor())) {
360 context.trace.report(SUPERCLASS_NOT_ACCESSIBLE_FROM_TRAIT.on(expression));
361 }
362 }
363 context.trace.record(BindingContext.EXPRESSION_TYPE, expression.getInstanceReference(), result);
364 context.trace.record(BindingContext.REFERENCE_TARGET, expression.getInstanceReference(), result.getConstructor().getDeclarationDescriptor());
365 if (superTypeQualifier != null) {
366 context.trace.record(BindingContext.TYPE_RESOLUTION_SCOPE, superTypeQualifier, context.scope);
367 }
368 }
369 return result;
370 }
371
372 @NotNull // No class receivers
373 private static LabelResolver.LabeledReceiverResolutionResult resolveToReceiver(
374 JetLabelQualifiedInstanceExpression expression,
375 ExpressionTypingContext context,
376 boolean onlyClassReceivers
377 ) {
378 String labelName = expression.getLabelName();
379 if (labelName != null) {
380 LabelResolver.LabeledReceiverResolutionResult resolutionResult = context.labelResolver.resolveThisLabel(
381 expression.getInstanceReference(), expression.getTargetLabel(), context, new LabelName(labelName));
382 if (onlyClassReceivers && resolutionResult.success()) {
383 if (!isDeclaredInClass(resolutionResult.getReceiverParameterDescriptor())) {
384 return LabelResolver.LabeledReceiverResolutionResult.labelResolutionSuccess(NO_RECEIVER_PARAMETER);
385 }
386 }
387 return resolutionResult;
388 }
389 else {
390 ReceiverParameterDescriptor result = NO_RECEIVER_PARAMETER;
391 List<ReceiverParameterDescriptor> receivers = context.scope.getImplicitReceiversHierarchy();
392 if (onlyClassReceivers) {
393 for (ReceiverParameterDescriptor receiver : receivers) {
394 if (isDeclaredInClass(receiver)) {
395 result = receiver;
396 break;
397 }
398 }
399 }
400 else if (!receivers.isEmpty()) {
401 result = receivers.get(0);
402 }
403 if (result != NO_RECEIVER_PARAMETER) {
404 context.trace.record(REFERENCE_TARGET, expression.getInstanceReference(), result.getContainingDeclaration());
405 recordThisOrSuperCallInTraceAndCallExtension(context, result, expression);
406
407 }
408 return LabelResolver.LabeledReceiverResolutionResult.labelResolutionSuccess(result);
409 }
410 }
411
412 private static void recordThisOrSuperCallInTraceAndCallExtension(
413 ExpressionTypingContext context,
414 ReceiverParameterDescriptor descriptor,
415 JetExpression expression
416 ) {
417 BindingTrace trace = context.trace;
418 Call call = CallMaker.makeCall(expression, NO_RECEIVER, null, expression, Collections.<ValueArgument>emptyList());
419 ResolutionCandidate<ReceiverParameterDescriptor> resolutionCandidate =
420 ResolutionCandidate.create(
421 call, descriptor, NO_RECEIVER, NO_RECEIVER, ExplicitReceiverKind.NO_EXPLICIT_RECEIVER, false);
422
423 ResolvedCallImpl<ReceiverParameterDescriptor> resolvedCall =
424 ResolvedCallImpl.create(resolutionCandidate,
425 TemporaryBindingTrace.create(trace, "Fake trace for fake 'this' or 'super' resolved call"),
426 TracingStrategy.EMPTY,
427 new DataFlowInfoForArgumentsImpl(call));
428 resolvedCall.markCallAsCompleted();
429
430 trace.record(RESOLVED_CALL, expression, resolvedCall);
431 trace.record(CALL, expression, call);
432
433 context.callResolverExtension.run(resolvedCall,
434 BasicCallResolutionContext.create(context, call, CheckValueArgumentsMode.DISABLED));
435 }
436
437 private static boolean isDeclaredInClass(ReceiverParameterDescriptor receiver) {
438 return receiver.getContainingDeclaration() instanceof ClassDescriptor;
439 }
440
441 @Override
442 public JetTypeInfo visitBlockExpression(@NotNull JetBlockExpression expression, ExpressionTypingContext context) {
443 return components.expressionTypingServices.getBlockReturnedType(expression, context, false);
444 }
445
446 @Override
447 public JetTypeInfo visitCallableReferenceExpression(@NotNull JetCallableReferenceExpression expression, ExpressionTypingContext context) {
448 JetTypeReference typeReference = expression.getTypeReference();
449
450 JetType receiverType =
451 typeReference == null
452 ? null
453 : components.expressionTypingServices.getTypeResolver().resolveType(context.scope, typeReference, context.trace, false);
454
455 JetSimpleNameExpression callableReference = expression.getCallableReference();
456 if (callableReference.getReferencedName().isEmpty()) {
457 context.trace.report(UNRESOLVED_REFERENCE.on(callableReference, callableReference));
458 JetType errorType = ErrorUtils.createErrorType("Empty callable reference");
459 return DataFlowUtils.checkType(errorType, expression, context, context.dataFlowInfo);
460 }
461
462 JetType result = getCallableReferenceType(expression, receiverType, context);
463 return DataFlowUtils.checkType(result, expression, context, context.dataFlowInfo);
464 }
465
466 @Nullable
467 private JetType getCallableReferenceType(
468 @NotNull JetCallableReferenceExpression expression,
469 @Nullable JetType lhsType,
470 @NotNull ExpressionTypingContext context
471 ) {
472 JetSimpleNameExpression reference = expression.getCallableReference();
473
474 boolean[] result = new boolean[1];
475 FunctionDescriptor descriptor = resolveCallableReferenceTarget(lhsType, context, expression, result);
476
477 if (!result[0]) {
478 context.trace.report(UNRESOLVED_REFERENCE.on(reference, reference));
479 }
480 if (descriptor == null) return null;
481
482 ReceiverParameterDescriptor receiverParameter = descriptor.getReceiverParameter();
483 ReceiverParameterDescriptor expectedThisObject = descriptor.getExpectedThisObject();
484 if (receiverParameter != null && expectedThisObject != null) {
485 context.trace.report(EXTENSION_IN_CLASS_REFERENCE_NOT_ALLOWED.on(reference, descriptor));
486 return null;
487 }
488
489 JetType receiverType = null;
490 if (receiverParameter != null) {
491 receiverType = receiverParameter.getType();
492 }
493 else if (expectedThisObject != null) {
494 receiverType = expectedThisObject.getType();
495 }
496
497 //noinspection ConstantConditions
498 JetType type = components.reflectionTypes.getKFunctionType(
499 Annotations.EMPTY,
500 receiverType,
501 DescriptorUtils.getValueParametersTypes(descriptor.getValueParameters()),
502 descriptor.getReturnType(),
503 receiverParameter != null
504 );
505
506 AnonymousFunctionDescriptor functionDescriptor = new AnonymousFunctionDescriptor(
507 context.scope.getContainingDeclaration(),
508 Annotations.EMPTY,
509 CallableMemberDescriptor.Kind.DECLARATION);
510
511 FunctionDescriptorUtil.initializeFromFunctionType(functionDescriptor, type, null, Modality.FINAL, Visibilities.PUBLIC);
512
513 context.trace.record(FUNCTION, expression, functionDescriptor);
514
515 return type;
516 }
517
518 @Nullable
519 private FunctionDescriptor resolveCallableReferenceTarget(
520 @Nullable JetType lhsType,
521 @NotNull ExpressionTypingContext context,
522 @NotNull JetCallableReferenceExpression expression,
523 @NotNull boolean[] result
524 ) {
525 JetSimpleNameExpression reference = expression.getCallableReference();
526
527 if (lhsType == null) {
528 return resolveCallableNotCheckingArguments(reference, NO_RECEIVER, context, result);
529 }
530
531 ClassifierDescriptor classifier = lhsType.getConstructor().getDeclarationDescriptor();
532 if (!(classifier instanceof ClassDescriptor)) {
533 context.trace.report(CALLABLE_REFERENCE_LHS_NOT_A_CLASS.on(expression));
534 return null;
535 }
536
537 ReceiverValue receiver = new TransientReceiver(lhsType);
538 TemporaryTraceAndCache temporaryWithReceiver = TemporaryTraceAndCache.create(
539 context, "trace to resolve callable reference with receiver", reference);
540 FunctionDescriptor descriptor = resolveCallableNotCheckingArguments(
541 reference, receiver, context.replaceTraceAndCache(temporaryWithReceiver), result);
542 if (result[0]) {
543 temporaryWithReceiver.commit();
544 return descriptor;
545 }
546
547 JetScope staticScope = getStaticNestedClassesScope((ClassDescriptor) classifier);
548 TemporaryTraceAndCache temporaryForStatic = TemporaryTraceAndCache.create(
549 context, "trace to resolve callable reference in static scope", reference);
550 FunctionDescriptor possibleStaticNestedClassConstructor = resolveCallableNotCheckingArguments(reference, NO_RECEIVER,
551 context.replaceTraceAndCache(temporaryForStatic).replaceScope(staticScope), result);
552 if (result[0]) {
553 temporaryForStatic.commit();
554 return possibleStaticNestedClassConstructor;
555 }
556
557 return null;
558 }
559
560 @Nullable
561 private FunctionDescriptor resolveCallableNotCheckingArguments(
562 @NotNull JetSimpleNameExpression reference,
563 @NotNull ReceiverValue receiver,
564 @NotNull ExpressionTypingContext context,
565 @NotNull boolean[] result
566 ) {
567 Call call = CallMaker.makeCall(reference, receiver, null, reference, ThrowingList.<ValueArgument>instance());
568
569 TemporaryBindingTrace trace = TemporaryBindingTrace.create(context.trace, "trace to resolve as function", reference);
570
571 ExpressionTypingContext contextForResolve = context.replaceBindingTrace(trace).replaceExpectedType(NO_EXPECTED_TYPE);
572 ResolvedCall<FunctionDescriptor> function = components.expressionTypingServices.getCallExpressionResolver()
573 .getResolvedCallForFunction(call, reference, contextForResolve, CheckValueArgumentsMode.DISABLED, result);
574 if (!result[0]) return null;
575
576 if (function instanceof VariableAsFunctionResolvedCall) {
577 // TODO: KProperty
578 context.trace.report(UNSUPPORTED.on(reference, "References to variables aren't supported yet"));
579 context.trace.report(UNRESOLVED_REFERENCE.on(reference, reference));
580 return null;
581 }
582
583 trace.commit();
584 return function != null ? function.getResultingDescriptor() : null;
585 }
586
587 @Override
588 public JetTypeInfo visitQualifiedExpression(@NotNull JetQualifiedExpression expression, ExpressionTypingContext context) {
589 CallExpressionResolver callExpressionResolver = components.expressionTypingServices.getCallExpressionResolver();
590 return callExpressionResolver.getQualifiedExpressionTypeInfo(expression, context);
591 }
592
593 @Override
594 public JetTypeInfo visitCallExpression(@NotNull JetCallExpression expression, ExpressionTypingContext context) {
595 CallExpressionResolver callExpressionResolver = components.expressionTypingServices.getCallExpressionResolver();
596 return callExpressionResolver.getCallExpressionTypeInfo(expression, NO_RECEIVER, null, context);
597 }
598
599 @Override
600 public JetTypeInfo visitUnaryExpression(@NotNull JetUnaryExpression expression, ExpressionTypingContext context) {
601 return visitUnaryExpression(expression, context, false);
602 }
603
604 public JetTypeInfo visitUnaryExpression(JetUnaryExpression expression, ExpressionTypingContext contextWithExpectedType, boolean isStatement) {
605 ExpressionTypingContext context = isUnaryExpressionDependentOnExpectedType(expression)
606 ? contextWithExpectedType
607 : contextWithExpectedType.replaceContextDependency(INDEPENDENT).replaceExpectedType(NO_EXPECTED_TYPE);
608
609 JetExpression baseExpression = expression.getBaseExpression();
610 if (baseExpression == null) return JetTypeInfo.create(null, context.dataFlowInfo);
611
612 JetSimpleNameExpression operationSign = expression.getOperationReference();
613
614 IElementType operationType = operationSign.getReferencedNameElementType();
615 // If it's a labeled expression
616 if (JetTokens.LABELS.contains(operationType)) {
617 return visitLabeledExpression(expression, context, isStatement);
618 }
619
620 // Special case for expr!!
621 if (operationType == JetTokens.EXCLEXCL) {
622 return visitExclExclExpression(expression, context);
623 }
624
625 // Type check the base expression
626 JetTypeInfo typeInfo = facade.getTypeInfo(baseExpression, context);
627 JetType type = typeInfo.getType();
628 if (type == null) {
629 return typeInfo;
630 }
631 DataFlowInfo dataFlowInfo = typeInfo.getDataFlowInfo();
632
633 // Conventions for unary operations
634 Name name = OperatorConventions.UNARY_OPERATION_NAMES.get(operationType);
635 if (name == null) {
636 context.trace.report(UNSUPPORTED.on(operationSign, "visitUnaryExpression"));
637 return JetTypeInfo.create(null, dataFlowInfo);
638 }
639
640 // a[i]++/-- takes special treatment because it is actually let j = i, arr = a in arr.set(j, a.get(j).inc())
641 if ((operationType == JetTokens.PLUSPLUS || operationType == JetTokens.MINUSMINUS) && baseExpression instanceof JetArrayAccessExpression) {
642 JetExpression stubExpression = ExpressionTypingUtils.createFakeExpressionOfType(baseExpression.getProject(), context.trace, "$e", type);
643 resolveArrayAccessSetMethod((JetArrayAccessExpression) baseExpression,
644 stubExpression,
645 context.replaceBindingTrace(
646 TemporaryBindingTrace.create(context.trace, "trace to resolve array access set method for unary expression", expression)),
647 context.trace);
648 }
649
650 ExpressionReceiver receiver = new ExpressionReceiver(baseExpression, type);
651
652 // Resolve the operation reference
653 OverloadResolutionResults<FunctionDescriptor> resolutionResults = components.callResolver.resolveCallWithGivenName(
654 context,
655 CallMaker.makeCall(receiver, expression),
656 expression.getOperationReference(),
657 name);
658
659 if (!resolutionResults.isSuccess()) {
660 return JetTypeInfo.create(null, dataFlowInfo);
661 }
662
663 // Computing the return type
664 JetType returnType = resolutionResults.getResultingDescriptor().getReturnType();
665 JetType result;
666 if (operationType == JetTokens.PLUSPLUS || operationType == JetTokens.MINUSMINUS) {
667 assert returnType != null : "returnType is null for " + resolutionResults.getResultingDescriptor();
668 if (JetTypeChecker.INSTANCE.isSubtypeOf(returnType, KotlinBuiltIns.getInstance().getUnitType())) {
669 result = ErrorUtils.createErrorType(KotlinBuiltIns.getInstance().getUnit().getName().asString());
670 context.trace.report(INC_DEC_SHOULD_NOT_RETURN_UNIT.on(operationSign));
671 }
672 else {
673 JetType receiverType = receiver.getType();
674 if (!JetTypeChecker.INSTANCE.isSubtypeOf(returnType, receiverType)) {
675 context.trace.report(RESULT_TYPE_MISMATCH.on(operationSign, name.asString(), receiverType, returnType));
676 }
677 else {
678 context.trace.record(BindingContext.VARIABLE_REASSIGNMENT, expression);
679
680 checkLValue(context.trace, baseExpression);
681 }
682 // TODO : Maybe returnType?
683 result = receiverType;
684 }
685 }
686 else {
687 result = returnType;
688 }
689
690 CompileTimeConstant<?> value = ConstantExpressionEvaluator.object$.evaluate(expression, contextWithExpectedType.trace,
691 contextWithExpectedType.expectedType);
692 if (value != null) {
693 return createCompileTimeConstantTypeInfo(value, expression, contextWithExpectedType);
694 }
695
696 return DataFlowUtils.checkType(result, expression, contextWithExpectedType, dataFlowInfo);
697 }
698
699 @NotNull
700 public static JetTypeInfo createCompileTimeConstantTypeInfo(
701 @NotNull CompileTimeConstant<?> value,
702 @NotNull JetExpression expression,
703 @NotNull ExpressionTypingContext context
704 ) {
705 JetType expressionType = value.getType(KotlinBuiltIns.getInstance());
706 if (value instanceof IntegerValueTypeConstant && context.contextDependency == INDEPENDENT) {
707 expressionType = ((IntegerValueTypeConstant) value).getType(context.expectedType);
708 ArgumentTypeResolver.updateNumberType(expressionType, expression, context.trace);
709 }
710
711 return DataFlowUtils.checkType(expressionType, expression, context, context.dataFlowInfo);
712 }
713
714 private JetTypeInfo visitExclExclExpression(@NotNull JetUnaryExpression expression, @NotNull ExpressionTypingContext context) {
715 JetExpression baseExpression = expression.getBaseExpression();
716 assert baseExpression != null;
717 JetSimpleNameExpression operationSign = expression.getOperationReference();
718 assert operationSign.getReferencedNameElementType() == JetTokens.EXCLEXCL;
719
720 Call call = createCallForSpecialConstruction(expression, Collections.singletonList(baseExpression));
721 components.controlStructureTypingUtils.resolveSpecialConstructionAsCall(
722 call, "ExclExcl", Collections.singletonList("baseExpr"), Collections.singletonList(true), context, null);
723 JetTypeInfo baseTypeInfo = BindingContextUtils.getRecordedTypeInfo(baseExpression, context.trace.getBindingContext());
724 assert baseTypeInfo != null : "Base expression was not processed: " + expression;
725 JetType baseType = baseTypeInfo.getType();
726 if (baseType == null) {
727 return baseTypeInfo;
728 }
729 DataFlowInfo dataFlowInfo = baseTypeInfo.getDataFlowInfo();
730 if (isKnownToBeNotNull(baseExpression, context) && !baseType.isError()) {
731 context.trace.report(UNNECESSARY_NOT_NULL_ASSERTION.on(operationSign, baseType));
732 }
733 else {
734 DataFlowValue value = DataFlowValueFactory.createDataFlowValue(baseExpression, baseType, context.trace.getBindingContext());
735 dataFlowInfo = dataFlowInfo.disequate(value, DataFlowValue.NULL);
736 }
737 return JetTypeInfo.create(TypeUtils.makeNotNullable(baseType), dataFlowInfo);
738 }
739
740 private JetTypeInfo visitLabeledExpression(@NotNull JetUnaryExpression expression, @NotNull ExpressionTypingContext context,
741 boolean isStatement) {
742 JetExpression baseExpression = expression.getBaseExpression();
743 assert baseExpression != null;
744 JetSimpleNameExpression operationSign = expression.getOperationReference();
745 assert JetTokens.LABELS.contains(operationSign.getReferencedNameElementType());
746
747 String referencedName = operationSign.getReferencedName();
748 context.labelResolver.enterLabeledElement(new LabelName(referencedName.substring(1)), baseExpression);
749 // TODO : Some processing for the label?
750 JetTypeInfo typeInfo = facade.getTypeInfo(baseExpression, context, isStatement);
751 context.labelResolver.exitLabeledElement(baseExpression);
752 return typeInfo;
753 }
754
755 private static boolean isKnownToBeNotNull(JetExpression expression, ExpressionTypingContext context) {
756 JetType type = context.trace.get(EXPRESSION_TYPE, expression);
757 assert type != null : "This method is only supposed to be called when the type is not null";
758 return isKnownToBeNotNull(expression, type, context);
759 }
760
761 private static boolean isKnownToBeNotNull(JetExpression expression, JetType jetType, ExpressionTypingContext context) {
762 DataFlowValue dataFlowValue = DataFlowValueFactory.createDataFlowValue(expression, jetType, context.trace.getBindingContext());
763 return !context.dataFlowInfo.getNullability(dataFlowValue).canBeNull();
764 }
765
766 public static void checkLValue(@NotNull BindingTrace trace, @NotNull JetExpression expression) {
767 checkLValue(trace, expression, false);
768 }
769
770 private static void checkLValue(@NotNull BindingTrace trace, @NotNull JetExpression expressionWithParenthesis, boolean canBeThis) {
771 JetExpression expression = JetPsiUtil.deparenthesize(expressionWithParenthesis);
772 if (expression instanceof JetArrayAccessExpression) {
773 JetExpression arrayExpression = ((JetArrayAccessExpression) expression).getArrayExpression();
774 if (arrayExpression != null) {
775 checkLValue(trace, arrayExpression, true);
776 }
777 return;
778 }
779 if (canBeThis && expression instanceof JetThisExpression) return;
780 VariableDescriptor variable = BindingContextUtils.extractVariableDescriptorIfAny(trace.getBindingContext(), expression, true);
781
782 JetExpression reportOn = expression != null ? expression : expressionWithParenthesis;
783 if (variable instanceof PropertyDescriptor) {
784 PropertyDescriptor propertyDescriptor = (PropertyDescriptor) variable;
785 if (propertyDescriptor.isSetterProjectedOut()) {
786 trace.report(SETTER_PROJECTED_OUT.on(reportOn, propertyDescriptor));
787 }
788 }
789
790 if (variable == null) {
791 trace.report(VARIABLE_EXPECTED.on(reportOn));
792 }
793 }
794
795 @Override
796 public JetTypeInfo visitBinaryExpression(@NotNull JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
797 ExpressionTypingContext context = isBinaryExpressionDependentOnExpectedType(expression)
798 ? contextWithExpectedType
799 : contextWithExpectedType.replaceContextDependency(INDEPENDENT).replaceExpectedType(NO_EXPECTED_TYPE);
800
801 JetSimpleNameExpression operationSign = expression.getOperationReference();
802 JetExpression left = expression.getLeft();
803 JetExpression right = expression.getRight();
804 IElementType operationType = operationSign.getReferencedNameElementType();
805
806 JetTypeInfo result;
807
808 //Expressions that can depend on expected type
809 if (operationType == JetTokens.IDENTIFIER) {
810 Name referencedName = operationSign.getReferencedNameAsName();
811 result = getTypeInfoForBinaryCall(referencedName, context, expression);
812 }
813 else if (OperatorConventions.BINARY_OPERATION_NAMES.containsKey(operationType)) {
814 Name referencedName = OperatorConventions.BINARY_OPERATION_NAMES.get(operationType);
815 result = getTypeInfoForBinaryCall(referencedName, context, expression);
816 }
817 else if (operationType == JetTokens.ELVIS) {
818 //base expression of elvis operator is checked for 'type mismatch', so the whole expression shouldn't be checked
819 return visitElvisExpression(expression, context);
820 }
821
822 //Expressions that don't depend on expected type
823 else if (operationType == JetTokens.EQ) {
824 result = visitAssignment(expression, context);
825 }
826 else if (OperatorConventions.ASSIGNMENT_OPERATIONS.containsKey(operationType)) {
827 result = visitAssignmentOperation(expression, context);
828 }
829 else if (OperatorConventions.COMPARISON_OPERATIONS.contains(operationType)) {
830 result = visitComparison(expression, context, operationSign);
831 }
832 else if (OperatorConventions.EQUALS_OPERATIONS.contains(operationType)) {
833 result = visitEquality(expression, context, operationSign, left, right);
834 }
835 else if (operationType == JetTokens.EQEQEQ || operationType == JetTokens.EXCLEQEQEQ) {
836 ensureNonemptyIntersectionOfOperandTypes(expression, context);
837 // TODO : Check comparison pointlessness
838 result = JetTypeInfo.create(KotlinBuiltIns.getInstance().getBooleanType(), context.dataFlowInfo);
839 }
840 else if (OperatorConventions.IN_OPERATIONS.contains(operationType)) {
841 result = checkInExpression(expression, operationSign, left, right, context);
842 }
843 else if (OperatorConventions.BOOLEAN_OPERATIONS.containsKey(operationType)) {
844 result = visitBooleanOperationExpression(operationType, left, right, context);
845 }
846 else {
847 context.trace.report(UNSUPPORTED.on(operationSign, "Unknown operation"));
848 result = JetTypeInfo.create(null, context.dataFlowInfo);
849 }
850 CompileTimeConstant<?> value = ConstantExpressionEvaluator.object$.
851 evaluate(expression, contextWithExpectedType.trace, contextWithExpectedType.expectedType);
852 if (value != null) {
853 return createCompileTimeConstantTypeInfo(value, expression, contextWithExpectedType);
854 }
855 return DataFlowUtils.checkType(result, expression, contextWithExpectedType);
856 }
857
858 private JetTypeInfo visitEquality(
859 JetBinaryExpression expression,
860 ExpressionTypingContext context,
861 JetSimpleNameExpression operationSign,
862 final JetExpression left,
863 final JetExpression right
864 ) {
865 DataFlowInfo dataFlowInfo = context.dataFlowInfo;
866 if (right == null || left == null) {
867 ExpressionTypingUtils.getTypeInfoOrNullType(right, context, facade);
868 ExpressionTypingUtils.getTypeInfoOrNullType(left, context, facade);
869 return JetTypeInfo.create(KotlinBuiltIns.getInstance().getBooleanType(), dataFlowInfo);
870 }
871 ExpressionReceiver receiver = ExpressionTypingUtils.safeGetExpressionReceiver(facade, left, context);
872
873 JetTypeInfo leftTypeInfo = getTypeInfoOrNullType(left, context, facade);
874
875 dataFlowInfo = leftTypeInfo.getDataFlowInfo();
876 ExpressionTypingContext contextWithDataFlow = context.replaceDataFlowInfo(dataFlowInfo);
877
878 JetTypeInfo rightTypeInfo = facade.getTypeInfo(right, contextWithDataFlow);
879 dataFlowInfo = rightTypeInfo.getDataFlowInfo();
880
881 TemporaryBindingTrace traceInterpretingRightAsNullableAny = TemporaryBindingTrace.create(
882 context.trace, "trace to resolve 'equals(Any?)' interpreting as of type Any? an expression:", right);
883 traceInterpretingRightAsNullableAny.record(EXPRESSION_TYPE, right, KotlinBuiltIns.getInstance().getNullableAnyType());
884
885 Call call = CallMaker.makeCallWithExpressions(operationSign, receiver, null, operationSign, Collections.singletonList(right));
886 ExpressionTypingContext newContext = context.replaceBindingTrace(traceInterpretingRightAsNullableAny);
887 OverloadResolutionResults<FunctionDescriptor> resolutionResults =
888 components.callResolver.resolveCallWithGivenName(newContext, call, operationSign, OperatorConventions.EQUALS);
889
890 traceInterpretingRightAsNullableAny.commit(new TraceEntryFilter() {
891 @Override
892 public boolean accept(@Nullable WritableSlice<?, ?> slice, Object key) {
893 // the type of the right expression isn't 'Any?' actually
894 if (key == right && slice == EXPRESSION_TYPE) return false;
895
896 // a hack due to KT-678
897 // without this line an autocast is reported on the receiver (if it was previously checked for not-null)
898 // with not-null check the resolution result changes from 'fun Any?.equals' to 'equals' member
899 if (key == left && slice == AUTOCAST) return false;
900
901 return true;
902 }
903 }, true);
904
905 if (resolutionResults.isSuccess()) {
906 FunctionDescriptor equals = resolutionResults.getResultingCall().getResultingDescriptor();
907 if (ensureBooleanResult(operationSign, OperatorConventions.EQUALS, equals.getReturnType(), context)) {
908 ensureNonemptyIntersectionOfOperandTypes(expression, context);
909 }
910 }
911 else {
912 if (resolutionResults.isAmbiguity()) {
913 context.trace.report(OVERLOAD_RESOLUTION_AMBIGUITY.on(operationSign, resolutionResults.getResultingCalls()));
914 }
915 else {
916 context.trace.report(EQUALS_MISSING.on(operationSign));
917 }
918 }
919 return JetTypeInfo.create(KotlinBuiltIns.getInstance().getBooleanType(), dataFlowInfo);
920 }
921
922 @NotNull
923 private JetTypeInfo visitComparison(
924 @NotNull JetBinaryExpression expression,
925 @NotNull ExpressionTypingContext context,
926 @NotNull JetSimpleNameExpression operationSign
927 ) {
928 JetTypeInfo typeInfo = getTypeInfoForBinaryCall(OperatorConventions.COMPARE_TO, context, expression);
929 DataFlowInfo dataFlowInfo = typeInfo.getDataFlowInfo();
930 JetType compareToReturnType = typeInfo.getType();
931 JetType type = null;
932 if (compareToReturnType != null && !compareToReturnType.isError()) {
933 TypeConstructor constructor = compareToReturnType.getConstructor();
934 KotlinBuiltIns builtIns = KotlinBuiltIns.getInstance();
935 TypeConstructor intTypeConstructor = builtIns.getInt().getTypeConstructor();
936 if (constructor.equals(intTypeConstructor)) {
937 type = builtIns.getBooleanType();
938 }
939 else {
940 context.trace.report(COMPARE_TO_TYPE_MISMATCH.on(operationSign, compareToReturnType));
941 }
942 }
943 return JetTypeInfo.create(type, dataFlowInfo);
944 }
945
946 @NotNull
947 private JetTypeInfo visitBooleanOperationExpression(
948 @Nullable IElementType operationType,
949 @Nullable JetExpression left,
950 @Nullable JetExpression right,
951 @NotNull ExpressionTypingContext context
952 ) {
953 JetType booleanType = KotlinBuiltIns.getInstance().getBooleanType();
954 JetTypeInfo leftTypeInfo = getTypeInfoOrNullType(left, context.replaceExpectedType(booleanType), facade);
955 DataFlowInfo dataFlowInfo = leftTypeInfo.getDataFlowInfo();
956
957 WritableScopeImpl leftScope = newWritableScopeImpl(context, "Left scope of && or ||");
958 // TODO: This gets computed twice: here and in extractDataFlowInfoFromCondition() for the whole condition
959 boolean isAnd = operationType == JetTokens.ANDAND;
960 DataFlowInfo flowInfoLeft = DataFlowUtils.extractDataFlowInfoFromCondition(left, isAnd, context).and(dataFlowInfo);
961 WritableScopeImpl rightScope = isAnd ? leftScope : newWritableScopeImpl(context, "Right scope of && or ||");
962
963 ExpressionTypingContext contextForRightExpr =
964 context.replaceDataFlowInfo(flowInfoLeft).replaceScope(rightScope).replaceExpectedType(booleanType);
965 if (right != null) {
966 facade.getTypeInfo(right, contextForRightExpr);
967 }
968 return JetTypeInfo.create(booleanType, dataFlowInfo);
969 }
970
971 @NotNull
972 private JetTypeInfo visitElvisExpression(
973 @NotNull JetBinaryExpression expression,
974 @NotNull ExpressionTypingContext contextWithExpectedType
975 ) {
976 ExpressionTypingContext context = contextWithExpectedType.replaceExpectedType(NO_EXPECTED_TYPE);
977 JetExpression left = expression.getLeft();
978 JetExpression right = expression.getRight();
979
980 if (left == null || right == null) {
981 getTypeInfoOrNullType(left, context, facade);
982 return JetTypeInfo.create(null, context.dataFlowInfo);
983 }
984
985 Call call = createCallForSpecialConstruction(expression, Lists.newArrayList(left, right));
986 ResolvedCall<FunctionDescriptor> resolvedCall = components.controlStructureTypingUtils.resolveSpecialConstructionAsCall(
987 call, "Elvis", Lists.newArrayList("left", "right"), Lists.newArrayList(true, false), contextWithExpectedType, null);
988 JetTypeInfo leftTypeInfo = BindingContextUtils.getRecordedTypeInfo(left, context.trace.getBindingContext());
989 assert leftTypeInfo != null : "Left expression was not processed: " + expression;
990 JetType leftType = leftTypeInfo.getType();
991 if (leftType != null && isKnownToBeNotNull(left, leftType, context)) {
992 context.trace.report(USELESS_ELVIS.on(left, leftType));
993 }
994 JetTypeInfo rightTypeInfo = BindingContextUtils.getRecordedTypeInfo(right, context.trace.getBindingContext());
995 assert rightTypeInfo != null : "Right expression was not processed: " + expression;
996 JetType rightType = rightTypeInfo.getType();
997
998 DataFlowInfo dataFlowInfo = resolvedCall.getDataFlowInfoForArguments().getResultInfo();
999 JetType type = resolvedCall.getResultingDescriptor().getReturnType();
1000 if (type == null || rightType == null) return JetTypeInfo.create(null, dataFlowInfo);
1001
1002 return JetTypeInfo.create(TypeUtils.makeNullableAsSpecified(type, rightType.isNullable()), dataFlowInfo);
1003 }
1004
1005 @NotNull
1006 public JetTypeInfo checkInExpression(
1007 @NotNull JetElement callElement,
1008 @NotNull JetSimpleNameExpression operationSign,
1009 @Nullable JetExpression left,
1010 @Nullable JetExpression right,
1011 @NotNull ExpressionTypingContext context
1012 ) {
1013 ExpressionTypingContext contextWithNoExpectedType = context.replaceExpectedType(NO_EXPECTED_TYPE);
1014 if (right == null) {
1015 if (left != null) facade.getTypeInfo(left, contextWithNoExpectedType);
1016 return JetTypeInfo.create(null, context.dataFlowInfo);
1017 }
1018
1019 DataFlowInfo dataFlowInfo = facade.getTypeInfo(right, contextWithNoExpectedType).getDataFlowInfo();
1020
1021 ExpressionReceiver receiver = safeGetExpressionReceiver(facade, right, contextWithNoExpectedType);
1022 ExpressionTypingContext contextWithDataFlow = context.replaceDataFlowInfo(dataFlowInfo);
1023
1024 OverloadResolutionResults<FunctionDescriptor> resolutionResult = components.callResolver.resolveCallWithGivenName(
1025 contextWithDataFlow,
1026 CallMaker.makeCallWithExpressions(callElement, receiver, null, operationSign, Collections.singletonList(left)),
1027 operationSign,
1028 OperatorConventions.CONTAINS);
1029 JetType containsType = OverloadResolutionResultsUtil.getResultingType(resolutionResult, context.contextDependency);
1030 ensureBooleanResult(operationSign, OperatorConventions.CONTAINS, containsType, context);
1031
1032 if (left != null) {
1033 dataFlowInfo = facade.getTypeInfo(left, contextWithDataFlow).getDataFlowInfo().and(dataFlowInfo);
1034 }
1035
1036 return JetTypeInfo.create(resolutionResult.isSuccess() ? KotlinBuiltIns.getInstance().getBooleanType() : null, dataFlowInfo);
1037 }
1038
1039 private void ensureNonemptyIntersectionOfOperandTypes(JetBinaryExpression expression, ExpressionTypingContext context) {
1040 JetExpression left = expression.getLeft();
1041 if (left == null) return;
1042
1043 JetExpression right = expression.getRight();
1044
1045 // TODO : duplicated effort for == and !=
1046 JetType leftType = facade.getTypeInfo(left, context).getType();
1047 if (leftType != null && right != null) {
1048 JetType rightType = facade.getTypeInfo(right, context).getType();
1049
1050 if (rightType != null) {
1051 if (TypeUtils.isIntersectionEmpty(leftType, rightType)) {
1052 context.trace.report(EQUALITY_NOT_APPLICABLE.on(expression, expression.getOperationReference(), leftType, rightType));
1053 }
1054 checkSenselessComparisonWithNull(expression, left, right, context);
1055 }
1056 }
1057 }
1058
1059 private void checkSenselessComparisonWithNull(@NotNull JetBinaryExpression expression, @NotNull JetExpression left, @NotNull JetExpression right, @NotNull ExpressionTypingContext context) {
1060 JetExpression expr;
1061 if (JetPsiUtil.isNullConstant(left)) {
1062 expr = right;
1063 }
1064 else if (JetPsiUtil.isNullConstant(right)) {
1065 expr = left;
1066 }
1067 else return;
1068
1069 JetSimpleNameExpression operationSign = expression.getOperationReference();
1070 JetType type = facade.getTypeInfo(expr, context).getType();
1071 if (type == null || type.isError()) return;
1072
1073 DataFlowValue value = DataFlowValueFactory.createDataFlowValue(expr, type, context.trace.getBindingContext());
1074 Nullability nullability = context.dataFlowInfo.getNullability(value);
1075
1076 boolean expressionIsAlways;
1077 boolean equality = operationSign.getReferencedNameElementType() == JetTokens.EQEQ || operationSign.getReferencedNameElementType() == JetTokens.EQEQEQ;
1078
1079 if (nullability == Nullability.NULL) {
1080 expressionIsAlways = equality;
1081 }
1082 else if (nullability == Nullability.NOT_NULL) {
1083 expressionIsAlways = !equality;
1084 }
1085 else return;
1086
1087 context.trace.report(SENSELESS_COMPARISON.on(expression, expression, expressionIsAlways));
1088 }
1089
1090 @NotNull
1091 private JetTypeInfo visitAssignmentOperation(JetBinaryExpression expression, ExpressionTypingContext context) {
1092 return assignmentIsNotAnExpressionError(expression, context);
1093 }
1094
1095 @NotNull
1096 private JetTypeInfo visitAssignment(JetBinaryExpression expression, ExpressionTypingContext context) {
1097 return assignmentIsNotAnExpressionError(expression, context);
1098 }
1099
1100 @NotNull
1101 private JetTypeInfo assignmentIsNotAnExpressionError(JetBinaryExpression expression, ExpressionTypingContext context) {
1102 facade.checkStatementType(expression, context);
1103 context.trace.report(ASSIGNMENT_IN_EXPRESSION_CONTEXT.on(expression));
1104 return JetTypeInfo.create(null, context.dataFlowInfo);
1105 }
1106
1107 @Override
1108 public JetTypeInfo visitArrayAccessExpression(@NotNull JetArrayAccessExpression expression, ExpressionTypingContext context) {
1109 JetTypeInfo typeInfo = resolveArrayAccessGetMethod(expression, context);
1110 return DataFlowUtils.checkType(typeInfo, expression, context);
1111 }
1112
1113 @NotNull
1114 public JetTypeInfo getTypeInfoForBinaryCall(
1115 @NotNull Name name,
1116 @NotNull ExpressionTypingContext context,
1117 @NotNull JetBinaryExpression binaryExpression
1118 ) {
1119 JetExpression left = binaryExpression.getLeft();
1120 DataFlowInfo dataFlowInfo = context.dataFlowInfo;
1121 if (left != null) {
1122 //left here is a receiver, so it doesn't depend on expected type
1123 dataFlowInfo = facade.getTypeInfo(
1124 left, context.replaceContextDependency(INDEPENDENT).replaceExpectedType(NO_EXPECTED_TYPE)).getDataFlowInfo();
1125 }
1126 ExpressionTypingContext contextWithDataFlow = context.replaceDataFlowInfo(dataFlowInfo);
1127
1128 OverloadResolutionResults<FunctionDescriptor> resolutionResults;
1129 if (left != null) {
1130 ExpressionReceiver receiver = safeGetExpressionReceiver(facade, left, context);
1131 resolutionResults = components.callResolver.resolveBinaryCall(
1132 contextWithDataFlow.replaceScope(context.scope),
1133 receiver, binaryExpression, name
1134 );
1135 }
1136 else {
1137 resolutionResults = OverloadResolutionResultsImpl.nameNotFound();
1138 }
1139
1140 if (resolutionResults.isSingleResult()) {
1141 dataFlowInfo = resolutionResults.getResultingCall().getDataFlowInfoForArguments().getResultInfo();
1142 }
1143
1144 return JetTypeInfo.create(OverloadResolutionResultsUtil.getResultingType(resolutionResults, context.contextDependency), dataFlowInfo);
1145 }
1146
1147 @Override
1148 public JetTypeInfo visitDeclaration(@NotNull JetDeclaration dcl, ExpressionTypingContext context) {
1149 context.trace.report(DECLARATION_IN_ILLEGAL_CONTEXT.on(dcl));
1150 return JetTypeInfo.create(null, context.dataFlowInfo);
1151 }
1152
1153 @Override
1154 public JetTypeInfo visitRootPackageExpression(@NotNull JetRootPackageExpression expression, ExpressionTypingContext context) {
1155 if (JetPsiUtil.isLHSOfDot(expression)) {
1156 return DataFlowUtils.checkType(JetModuleUtil.getRootPackageType(expression), expression, context, context.dataFlowInfo);
1157 }
1158 context.trace.report(PACKAGE_IS_NOT_AN_EXPRESSION.on(expression));
1159 return JetTypeInfo.create(null, context.dataFlowInfo);
1160 }
1161
1162
1163 @Override
1164 public JetTypeInfo visitStringTemplateExpression(@NotNull JetStringTemplateExpression expression, ExpressionTypingContext contextWithExpectedType) {
1165 final ExpressionTypingContext context = contextWithExpectedType.replaceExpectedType(NO_EXPECTED_TYPE).replaceContextDependency(INDEPENDENT);
1166 final DataFlowInfo[] dataFlowInfo = new DataFlowInfo[] { context.dataFlowInfo };
1167 for (JetStringTemplateEntry entry : expression.getEntries()) {
1168 entry.accept(new JetVisitorVoid() {
1169
1170 @Override
1171 public void visitStringTemplateEntryWithExpression(@NotNull JetStringTemplateEntryWithExpression entry) {
1172 JetExpression entryExpression = entry.getExpression();
1173 if (entryExpression != null) {
1174 JetTypeInfo typeInfo = facade.getTypeInfo(entryExpression, context.replaceDataFlowInfo(dataFlowInfo[0]));
1175 dataFlowInfo[0] = typeInfo.getDataFlowInfo();
1176 }
1177 }
1178
1179 @Override
1180 public void visitEscapeStringTemplateEntry(@NotNull JetEscapeStringTemplateEntry entry) {
1181 CompileTimeConstantChecker.CharacterWithDiagnostic value = CompileTimeConstantChecker.escapedStringToCharacter(entry.getText(), entry);
1182 Diagnostic diagnostic = value.getDiagnostic();
1183 if (diagnostic != null) {
1184 context.trace.report(diagnostic);
1185 }
1186 }
1187 });
1188 }
1189 ConstantExpressionEvaluator.object$.evaluate(expression, context.trace, contextWithExpectedType.expectedType);
1190 return DataFlowUtils.checkType(KotlinBuiltIns.getInstance().getStringType(), expression, contextWithExpectedType, dataFlowInfo[0]);
1191 }
1192
1193 @Override
1194 public JetTypeInfo visitAnnotatedExpression(@NotNull JetAnnotatedExpression expression, ExpressionTypingContext context) {
1195 return visitAnnotatedExpression(expression, context, false);
1196 }
1197
1198 public JetTypeInfo visitAnnotatedExpression(JetAnnotatedExpression expression, ExpressionTypingContext context, boolean isStatement) {
1199 components.expressionTypingServices.getAnnotationResolver().resolveAnnotationsWithArguments(
1200 context.scope, expression.getAnnotationEntries(), context.trace);
1201
1202 JetExpression baseExpression = expression.getBaseExpression();
1203 if (baseExpression == null) {
1204 return JetTypeInfo.create(null, context.dataFlowInfo);
1205 }
1206 return facade.getTypeInfo(baseExpression, context, isStatement);
1207 }
1208
1209 @Override
1210 public JetTypeInfo visitJetElement(@NotNull JetElement element, ExpressionTypingContext context) {
1211 context.trace.report(UNSUPPORTED.on(element, getClass().getCanonicalName()));
1212 return JetTypeInfo.create(null, context.dataFlowInfo);
1213 }
1214
1215 @NotNull
1216 /*package*/ JetTypeInfo resolveArrayAccessSetMethod(@NotNull JetArrayAccessExpression arrayAccessExpression, @NotNull JetExpression rightHandSide, @NotNull ExpressionTypingContext context, @NotNull BindingTrace traceForResolveResult) {
1217 return resolveArrayAccessSpecialMethod(arrayAccessExpression, rightHandSide, context, traceForResolveResult, false);
1218 }
1219
1220 @NotNull
1221 /*package*/ JetTypeInfo resolveArrayAccessGetMethod(@NotNull JetArrayAccessExpression arrayAccessExpression, @NotNull ExpressionTypingContext context) {
1222 return resolveArrayAccessSpecialMethod(arrayAccessExpression, null, context, context.trace, true);
1223 }
1224
1225 @NotNull
1226 private JetTypeInfo resolveArrayAccessSpecialMethod(@NotNull JetArrayAccessExpression arrayAccessExpression,
1227 @Nullable JetExpression rightHandSide, //only for 'set' method
1228 @NotNull ExpressionTypingContext oldContext,
1229 @NotNull BindingTrace traceForResolveResult,
1230 boolean isGet) {
1231 JetExpression arrayExpression = arrayAccessExpression.getArrayExpression();
1232 if (arrayExpression == null) return JetTypeInfo.create(null, oldContext.dataFlowInfo);
1233
1234 JetTypeInfo arrayTypeInfo = facade.getTypeInfo(arrayExpression, oldContext.replaceExpectedType(NO_EXPECTED_TYPE)
1235 .replaceContextDependency(INDEPENDENT));
1236 JetType arrayType = arrayTypeInfo.getType();
1237 if (arrayType == null) {
1238 for (JetExpression indexExpression : arrayAccessExpression.getIndexExpressions()) {
1239 facade.getTypeInfo(indexExpression, oldContext);
1240 }
1241 return arrayTypeInfo;
1242 }
1243
1244 DataFlowInfo dataFlowInfo = arrayTypeInfo.getDataFlowInfo();
1245 ExpressionTypingContext context = oldContext.replaceDataFlowInfo(dataFlowInfo);
1246 ExpressionReceiver receiver = new ExpressionReceiver(arrayExpression, arrayType);
1247 if (!isGet) assert rightHandSide != null;
1248
1249 OverloadResolutionResults<FunctionDescriptor> functionResults = components.callResolver.resolveCallWithGivenName(
1250 context,
1251 isGet
1252 ? CallMaker.makeArrayGetCall(receiver, arrayAccessExpression, Call.CallType.ARRAY_GET_METHOD)
1253 : CallMaker.makeArraySetCall(receiver, arrayAccessExpression, rightHandSide, Call.CallType.ARRAY_SET_METHOD),
1254 arrayAccessExpression,
1255 Name.identifier(isGet ? "get" : "set")
1256 );
1257
1258 List<JetExpression> indices = arrayAccessExpression.getIndexExpressions();
1259 // The accumulated data flow info of all index expressions is saved on the last index
1260 if (!indices.isEmpty()) {
1261 dataFlowInfo = facade.getTypeInfo(indices.get(indices.size() - 1), context).getDataFlowInfo();
1262 }
1263
1264 if (!isGet) {
1265 dataFlowInfo = facade.getTypeInfo(rightHandSide, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
1266 }
1267
1268 if (!functionResults.isSingleResult()) {
1269 traceForResolveResult.report(isGet ? NO_GET_METHOD.on(arrayAccessExpression) : NO_SET_METHOD.on(arrayAccessExpression));
1270 return JetTypeInfo.create(null, dataFlowInfo);
1271 }
1272 traceForResolveResult.record(isGet ? INDEXED_LVALUE_GET : INDEXED_LVALUE_SET, arrayAccessExpression, functionResults.getResultingCall());
1273 return JetTypeInfo.create(functionResults.getResultingDescriptor().getReturnType(), dataFlowInfo);
1274 }
1275 }