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.Sets;
020 import com.intellij.psi.tree.IElementType;
021 import org.jetbrains.annotations.NotNull;
022 import org.jetbrains.annotations.Nullable;
023 import org.jetbrains.jet.lang.descriptors.*;
024 import org.jetbrains.jet.lang.diagnostics.Errors;
025 import org.jetbrains.jet.lang.psi.*;
026 import org.jetbrains.jet.lang.resolve.*;
027 import org.jetbrains.jet.lang.resolve.calls.autocasts.DataFlowInfo;
028 import org.jetbrains.jet.lang.resolve.calls.context.TemporaryTraceAndCache;
029 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall;
030 import org.jetbrains.jet.lang.resolve.calls.results.OverloadResolutionResults;
031 import org.jetbrains.jet.lang.resolve.calls.results.OverloadResolutionResultsUtil;
032 import org.jetbrains.jet.lang.resolve.name.Name;
033 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
034 import org.jetbrains.jet.lang.resolve.scopes.WritableScope;
035 import org.jetbrains.jet.lang.resolve.scopes.receivers.ExpressionReceiver;
036 import org.jetbrains.jet.lang.types.JetType;
037 import org.jetbrains.jet.lang.types.JetTypeInfo;
038 import org.jetbrains.jet.lang.types.TypeUtils;
039 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
040 import org.jetbrains.jet.lexer.JetTokens;
041
042 import java.util.Collection;
043
044 import static org.jetbrains.jet.lang.diagnostics.Errors.*;
045 import static org.jetbrains.jet.lang.resolve.BindingContext.AMBIGUOUS_REFERENCE_TARGET;
046 import static org.jetbrains.jet.lang.resolve.BindingContext.VARIABLE_REASSIGNMENT;
047 import static org.jetbrains.jet.lang.resolve.calls.context.ContextDependency.INDEPENDENT;
048 import static org.jetbrains.jet.lang.types.TypeUtils.NO_EXPECTED_TYPE;
049 import static org.jetbrains.jet.lang.types.TypeUtils.noExpectedType;
050
051 @SuppressWarnings("SuspiciousMethodCalls")
052 public class ExpressionTypingVisitorForStatements extends ExpressionTypingVisitor {
053 private final WritableScope scope;
054 private final BasicExpressionTypingVisitor basic;
055 private final ControlStructureTypingVisitor controlStructures;
056 private final PatternMatchingTypingVisitor patterns;
057
058 public ExpressionTypingVisitorForStatements(
059 @NotNull ExpressionTypingInternals facade,
060 @NotNull WritableScope scope,
061 BasicExpressionTypingVisitor basic,
062 @NotNull ControlStructureTypingVisitor controlStructures,
063 @NotNull PatternMatchingTypingVisitor patterns) {
064 super(facade);
065 this.scope = scope;
066 this.basic = basic;
067 this.controlStructures = controlStructures;
068 this.patterns = patterns;
069 }
070
071 @Nullable
072 private static JetType checkAssignmentType(
073 @Nullable JetType assignmentType,
074 @NotNull JetBinaryExpression expression,
075 @NotNull ExpressionTypingContext context
076 ) {
077 if (assignmentType != null && !KotlinBuiltIns.getInstance().isUnit(assignmentType) && !noExpectedType(context.expectedType) &&
078 TypeUtils.equalTypes(context.expectedType, assignmentType)) {
079 context.trace.report(Errors.ASSIGNMENT_TYPE_MISMATCH.on(expression, context.expectedType));
080 return null;
081 }
082 return DataFlowUtils.checkStatementType(expression, context);
083 }
084
085 @Override
086 public JetTypeInfo visitObjectDeclaration(@NotNull JetObjectDeclaration declaration, ExpressionTypingContext context) {
087 TopDownAnalyzer.processClassOrObject(
088 context.replaceScope(scope).replaceContextDependency(INDEPENDENT), scope.getContainingDeclaration(), declaration);
089 ClassDescriptor classDescriptor = context.trace.getBindingContext().get(BindingContext.CLASS, declaration);
090 if (classDescriptor != null) {
091 scope.addClassifierDescriptor(classDescriptor);
092 }
093 return DataFlowUtils.checkStatementType(declaration, context, context.dataFlowInfo);
094 }
095
096 @Override
097 public JetTypeInfo visitProperty(@NotNull JetProperty property, ExpressionTypingContext typingContext) {
098 ExpressionTypingContext context = typingContext.replaceContextDependency(INDEPENDENT).replaceScope(scope);
099 JetTypeReference receiverTypeRef = property.getReceiverTypeRef();
100 if (receiverTypeRef != null) {
101 context.trace.report(LOCAL_EXTENSION_PROPERTY.on(receiverTypeRef));
102 }
103
104 JetPropertyAccessor getter = property.getGetter();
105 if (getter != null) {
106 context.trace.report(LOCAL_VARIABLE_WITH_GETTER.on(getter));
107 }
108
109 JetPropertyAccessor setter = property.getSetter();
110 if (setter != null) {
111 context.trace.report(LOCAL_VARIABLE_WITH_SETTER.on(setter));
112 }
113
114 JetExpression delegateExpression = property.getDelegateExpression();
115 if (delegateExpression != null) {
116 context.expressionTypingServices.getTypeInfo(delegateExpression, context);
117 context.trace.report(LOCAL_VARIABLE_WITH_DELEGATE.on(property.getDelegate()));
118 }
119
120 for (JetTypeParameter typeParameter : property.getTypeParameters()) {
121 AnnotationResolver.reportUnsupportedAnnotationForTypeParameter(typeParameter, context.trace);
122 }
123
124 VariableDescriptor propertyDescriptor = context.expressionTypingServices.getDescriptorResolver().
125 resolveLocalVariableDescriptor(scope, property, context.dataFlowInfo, context.trace);
126 JetExpression initializer = property.getInitializer();
127 DataFlowInfo dataFlowInfo = context.dataFlowInfo;
128 if (initializer != null) {
129 JetType outType = propertyDescriptor.getType();
130 JetTypeInfo typeInfo = facade.getTypeInfo(initializer, context.replaceExpectedType(outType));
131 dataFlowInfo = typeInfo.getDataFlowInfo();
132 }
133
134 {
135 VariableDescriptor olderVariable = scope.getLocalVariable(propertyDescriptor.getName());
136 ExpressionTypingUtils.checkVariableShadowing(context, propertyDescriptor, olderVariable);
137 }
138
139 scope.addVariableDescriptor(propertyDescriptor);
140 ModifiersChecker.create(context.trace).checkModifiersForLocalDeclaration(property);
141 return DataFlowUtils.checkStatementType(property, context, dataFlowInfo);
142 }
143
144 @Override
145 public JetTypeInfo visitMultiDeclaration(@NotNull JetMultiDeclaration multiDeclaration, ExpressionTypingContext context) {
146 context.expressionTypingServices.getAnnotationResolver().resolveAnnotationsWithArguments(
147 scope, multiDeclaration.getModifierList(), context.trace);
148
149 JetExpression initializer = multiDeclaration.getInitializer();
150 if (initializer == null) {
151 context.trace.report(INITIALIZER_REQUIRED_FOR_MULTIDECLARATION.on(multiDeclaration));
152 return JetTypeInfo.create(null, context.dataFlowInfo);
153 }
154 ExpressionReceiver expressionReceiver = ExpressionTypingUtils.getExpressionReceiver(
155 facade, initializer, context.replaceExpectedType(NO_EXPECTED_TYPE).replaceContextDependency(INDEPENDENT));
156 DataFlowInfo dataFlowInfo = facade.getTypeInfo(initializer, context).getDataFlowInfo();
157 if (expressionReceiver == null) {
158 return JetTypeInfo.create(null, dataFlowInfo);
159 }
160 ExpressionTypingUtils.defineLocalVariablesFromMultiDeclaration(scope, multiDeclaration, expressionReceiver, initializer, context);
161 return DataFlowUtils.checkStatementType(multiDeclaration, context, dataFlowInfo);
162 }
163
164 @Override
165 public JetTypeInfo visitNamedFunction(@NotNull JetNamedFunction function, ExpressionTypingContext context) {
166 SimpleFunctionDescriptor functionDescriptor = context.expressionTypingServices.getDescriptorResolver().
167 resolveFunctionDescriptorWithAnnotationArguments(
168 scope.getContainingDeclaration(), scope, function, context.trace, context.dataFlowInfo);
169
170 scope.addFunctionDescriptor(functionDescriptor);
171 JetScope functionInnerScope = FunctionDescriptorUtil.getFunctionInnerScope(context.scope, functionDescriptor, context.trace);
172 context.expressionTypingServices.checkFunctionReturnType(functionInnerScope, function, functionDescriptor, context.dataFlowInfo, null, context.trace);
173
174 context.expressionTypingServices.resolveValueParameters(
175 function.getValueParameters(), functionDescriptor.getValueParameters(), scope, context.dataFlowInfo, context.trace);
176
177 ModifiersChecker.create(context.trace).checkModifiersForLocalDeclaration(function);
178 return DataFlowUtils.checkStatementType(function, context, context.dataFlowInfo);
179 }
180
181 @Override
182 public JetTypeInfo visitClass(@NotNull JetClass klass, ExpressionTypingContext context) {
183 TopDownAnalyzer.processClassOrObject(
184 context.replaceScope(scope).replaceContextDependency(INDEPENDENT), scope.getContainingDeclaration(), klass);
185 ClassDescriptor classDescriptor = context.trace.getBindingContext().get(BindingContext.CLASS, klass);
186 if (classDescriptor != null) {
187 scope.addClassifierDescriptor(classDescriptor);
188 }
189 return DataFlowUtils.checkStatementType(klass, context, context.dataFlowInfo);
190 }
191
192 @Override
193 public JetTypeInfo visitTypedef(@NotNull JetTypedef typedef, ExpressionTypingContext context) {
194 return super.visitTypedef(typedef, context); // TODO
195 }
196
197 @Override
198 public JetTypeInfo visitDeclaration(@NotNull JetDeclaration dcl, ExpressionTypingContext context) {
199 return DataFlowUtils.checkStatementType(dcl, context, context.dataFlowInfo);
200 }
201
202 @Override
203 public JetTypeInfo visitBinaryExpression(@NotNull JetBinaryExpression expression, ExpressionTypingContext context) {
204 JetSimpleNameExpression operationSign = expression.getOperationReference();
205 IElementType operationType = operationSign.getReferencedNameElementType();
206 JetTypeInfo result;
207 if (operationType == JetTokens.EQ) {
208 result = visitAssignment(expression, context);
209 }
210 else if (OperatorConventions.ASSIGNMENT_OPERATIONS.containsKey(operationType)) {
211 result = visitAssignmentOperation(expression, context);
212 }
213 else {
214 return facade.getTypeInfo(expression, context);
215 }
216 return DataFlowUtils.checkType(result.getType(), expression, context, result.getDataFlowInfo());
217 }
218
219 @NotNull
220 protected JetTypeInfo visitAssignmentOperation(JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
221 //There is a temporary binding trace for an opportunity to resolve set method for array if needed (the initial trace should be used there)
222 TemporaryTraceAndCache temporary = TemporaryTraceAndCache.create(
223 contextWithExpectedType, "trace to resolve array set method for binary expression", expression);
224 ExpressionTypingContext context = contextWithExpectedType.replaceExpectedType(NO_EXPECTED_TYPE)
225 .replaceTraceAndCache(temporary).replaceContextDependency(INDEPENDENT);
226
227 JetSimpleNameExpression operationSign = expression.getOperationReference();
228 IElementType operationType = operationSign.getReferencedNameElementType();
229 JetExpression leftOperand = expression.getLeft();
230 JetTypeInfo leftInfo = ExpressionTypingUtils.getTypeInfoOrNullType(leftOperand, context, facade);
231 JetType leftType = leftInfo.getType();
232 DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();
233
234 JetExpression right = expression.getRight();
235 JetExpression left = leftOperand == null ? null : JetPsiUtil.deparenthesize(leftOperand);
236 if (right == null || left == null) {
237 temporary.commit();
238 return JetTypeInfo.create(null, dataFlowInfo);
239 }
240
241 if (leftType == null) {
242 dataFlowInfo = facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
243 context.trace.report(UNRESOLVED_REFERENCE.on(operationSign, operationSign));
244 temporary.commit();
245 return JetTypeInfo.create(null, dataFlowInfo);
246 }
247 ExpressionReceiver receiver = new ExpressionReceiver(left, leftType);
248
249 // We check that defined only one of '+=' and '+' operations, and call it (in the case '+' we then also assign)
250 // Check for '+='
251 Name name = OperatorConventions.ASSIGNMENT_OPERATIONS.get(operationType);
252 TemporaryTraceAndCache temporaryForAssignmentOperation = TemporaryTraceAndCache.create(
253 context, "trace to check assignment operation like '+=' for", expression);
254 OverloadResolutionResults<FunctionDescriptor> assignmentOperationDescriptors = BasicExpressionTypingVisitor.getResolutionResultsForBinaryCall(
255 scope, name, context.replaceTraceAndCache(temporaryForAssignmentOperation), expression, receiver);
256 JetType assignmentOperationType = OverloadResolutionResultsUtil.getResultingType(assignmentOperationDescriptors,
257 context.contextDependency);
258
259 // Check for '+'
260 Name counterpartName = OperatorConventions.BINARY_OPERATION_NAMES.get(OperatorConventions.ASSIGNMENT_OPERATION_COUNTERPARTS.get(operationType));
261 TemporaryTraceAndCache temporaryForBinaryOperation = TemporaryTraceAndCache.create(
262 context, "trace to check binary operation like '+' for", expression);
263 OverloadResolutionResults<FunctionDescriptor> binaryOperationDescriptors = BasicExpressionTypingVisitor.getResolutionResultsForBinaryCall(
264 scope, counterpartName, context.replaceTraceAndCache(temporaryForBinaryOperation), expression, receiver);
265 JetType binaryOperationType = OverloadResolutionResultsUtil.getResultingType(binaryOperationDescriptors, context.contextDependency);
266
267 JetType type = assignmentOperationType != null ? assignmentOperationType : binaryOperationType;
268 if (assignmentOperationDescriptors.isSuccess() && binaryOperationDescriptors.isSuccess()) {
269 // Both 'plus()' and 'plusAssign()' available => ambiguity
270 OverloadResolutionResults<FunctionDescriptor> ambiguityResolutionResults = OverloadResolutionResultsUtil.ambiguity(assignmentOperationDescriptors, binaryOperationDescriptors);
271 context.trace.report(ASSIGN_OPERATOR_AMBIGUITY.on(operationSign, ambiguityResolutionResults.getResultingCalls()));
272 Collection<DeclarationDescriptor> descriptors = Sets.newHashSet();
273 for (ResolvedCall<? extends FunctionDescriptor> call : ambiguityResolutionResults.getResultingCalls()) {
274 descriptors.add(call.getResultingDescriptor());
275 }
276 dataFlowInfo = facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
277 context.trace.record(AMBIGUOUS_REFERENCE_TARGET, operationSign, descriptors);
278 }
279 else if (assignmentOperationType != null && (assignmentOperationDescriptors.isSuccess() || !binaryOperationDescriptors.isSuccess())) {
280 // There's 'plusAssign()', so we do a.plusAssign(b)
281 temporaryForAssignmentOperation.commit();
282 if (!KotlinBuiltIns.getInstance().isUnit(assignmentOperationType)) {
283 context.trace.report(ASSIGNMENT_OPERATOR_SHOULD_RETURN_UNIT.on(operationSign, assignmentOperationDescriptors.getResultingDescriptor(), operationSign));
284 }
285 }
286 else {
287 // There's only 'plus()', so we try 'a = a + b'
288 temporaryForBinaryOperation.commit();
289 context.trace.record(VARIABLE_REASSIGNMENT, expression);
290 if (left instanceof JetArrayAccessExpression) {
291 ExpressionTypingContext contextForResolve = context.replaceScope(scope).replaceBindingTrace(TemporaryBindingTrace.create(
292 context.trace, "trace to resolve array set method for assignment", expression));
293 basic.resolveArrayAccessSetMethod((JetArrayAccessExpression) left, right, contextForResolve, context.trace);
294 }
295 dataFlowInfo = facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
296 BasicExpressionTypingVisitor.checkLValue(context.trace, leftOperand);
297 }
298 temporary.commit();
299 return JetTypeInfo.create(checkAssignmentType(type, expression, contextWithExpectedType), dataFlowInfo);
300 }
301
302 @NotNull
303 protected JetTypeInfo visitAssignment(JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
304 ExpressionTypingContext context =
305 contextWithExpectedType.replaceExpectedType(NO_EXPECTED_TYPE).replaceScope(scope).replaceContextDependency(INDEPENDENT);
306 JetExpression leftOperand = expression.getLeft();
307 JetExpression left = context.expressionTypingServices.deparenthesizeWithTypeResolution(leftOperand, context);
308 JetExpression right = expression.getRight();
309 if (left instanceof JetArrayAccessExpression) {
310 JetArrayAccessExpression arrayAccessExpression = (JetArrayAccessExpression) left;
311 if (right == null) return JetTypeInfo.create(null, context.dataFlowInfo);
312 JetTypeInfo typeInfo = basic.resolveArrayAccessSetMethod(arrayAccessExpression, right, context, context.trace);
313 BasicExpressionTypingVisitor.checkLValue(context.trace, arrayAccessExpression);
314 return JetTypeInfo.create(checkAssignmentType(typeInfo.getType(), expression, contextWithExpectedType),
315 typeInfo.getDataFlowInfo());
316 }
317 JetTypeInfo leftInfo = ExpressionTypingUtils.getTypeInfoOrNullType(left, context, facade);
318 JetType leftType = leftInfo.getType();
319 DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();
320 if (right != null) {
321 JetTypeInfo rightInfo = facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo).replaceExpectedType(leftType));
322 dataFlowInfo = rightInfo.getDataFlowInfo();
323 }
324 if (leftType != null && leftOperand != null) { //if leftType == null, some other error has been generated
325 BasicExpressionTypingVisitor.checkLValue(context.trace, leftOperand);
326 }
327 return DataFlowUtils.checkStatementType(expression, contextWithExpectedType, dataFlowInfo);
328 }
329
330
331 @Override
332 public JetTypeInfo visitExpression(@NotNull JetExpression expression, ExpressionTypingContext context) {
333 return facade.getTypeInfo(expression, context);
334 }
335
336 @Override
337 public JetTypeInfo visitJetElement(@NotNull JetElement element, ExpressionTypingContext context) {
338 context.trace.report(UNSUPPORTED.on(element, "in a block"));
339 return JetTypeInfo.create(null, context.dataFlowInfo);
340 }
341
342 @Override
343 public JetTypeInfo visitWhileExpression(@NotNull JetWhileExpression expression, ExpressionTypingContext context) {
344 return controlStructures.visitWhileExpression(expression, context, true);
345 }
346
347 @Override
348 public JetTypeInfo visitDoWhileExpression(@NotNull JetDoWhileExpression expression, ExpressionTypingContext context) {
349 return controlStructures.visitDoWhileExpression(expression, context, true);
350 }
351
352 @Override
353 public JetTypeInfo visitForExpression(@NotNull JetForExpression expression, ExpressionTypingContext context) {
354 return controlStructures.visitForExpression(expression, context, true);
355 }
356
357 @Override
358 public JetTypeInfo visitAnnotatedExpression(
359 @NotNull JetAnnotatedExpression expression, ExpressionTypingContext data
360 ) {
361 return basic.visitAnnotatedExpression(expression, data, true);
362 }
363
364 @Override
365 public JetTypeInfo visitIfExpression(@NotNull JetIfExpression expression, ExpressionTypingContext context) {
366 return controlStructures.visitIfExpression(expression, context, true);
367 }
368
369 @Override
370 public JetTypeInfo visitWhenExpression(@NotNull JetWhenExpression expression, ExpressionTypingContext context) {
371 return patterns.visitWhenExpression(expression, context, true);
372 }
373
374 @Override
375 public JetTypeInfo visitBlockExpression(@NotNull JetBlockExpression expression, ExpressionTypingContext context) {
376 return BasicExpressionTypingVisitor.visitBlockExpression(expression, context, true);
377 }
378
379 @Override
380 public JetTypeInfo visitParenthesizedExpression(@NotNull JetParenthesizedExpression expression, ExpressionTypingContext context) {
381 return basic.visitParenthesizedExpression(expression, context, true);
382 }
383
384 @Override
385 public JetTypeInfo visitUnaryExpression(@NotNull JetUnaryExpression expression, ExpressionTypingContext context) {
386 return basic.visitUnaryExpression(expression, context, true);
387 }
388 }