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