@NotNull
protected JetTypeInfo visitAssignment(
JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
ExpressionTypingContext context =
contextWithExpectedType.replaceExpectedType(TypeUtils.NO_EXPECTED_TYPE).replaceScope(scope);
JetExpression left =
context.expressionTypingServices.deparenthesize(expression.getLeft(), context);
JetExpression right = expression.getRight();
if (left instanceof JetArrayAccessExpression) {
JetArrayAccessExpression arrayAccessExpression = (JetArrayAccessExpression) left;
if (right == null) return JetTypeInfo.create(null, context.dataFlowInfo);
JetTypeInfo typeInfo =
basic.resolveArrayAccessSetMethod(arrayAccessExpression, right, context, context.trace);
basic.checkLValue(context.trace, arrayAccessExpression);
return JetTypeInfo.create(
checkAssignmentType(typeInfo.getType(), expression, contextWithExpectedType),
typeInfo.getDataFlowInfo());
}
JetTypeInfo leftInfo = facade.getTypeInfo(expression.getLeft(), context);
JetType leftType = leftInfo.getType();
DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();
if (right != null) {
JetTypeInfo rightInfo =
facade.getTypeInfo(
right, context.replaceDataFlowInfo(dataFlowInfo).replaceExpectedType(leftType));
dataFlowInfo = rightInfo.getDataFlowInfo();
}
if (leftType != null) { // if leftType == null, some another error has been generated
basic.checkLValue(context.trace, expression.getLeft());
}
return DataFlowUtils.checkStatementType(expression, contextWithExpectedType, dataFlowInfo);
}
@NotNull
public TypeInfoForCall getQualifiedExpressionExtendedTypeInfo(
@NotNull JetQualifiedExpression expression,
@NotNull ResolutionContext context,
@NotNull ResolveMode resolveMode) {
// TODO : functions as values
JetExpression selectorExpression = expression.getSelectorExpression();
JetExpression receiverExpression = expression.getReceiverExpression();
JetTypeInfo receiverTypeInfo =
expressionTypingServices.getTypeInfoWithNamespaces(
receiverExpression,
context.scope,
NO_EXPECTED_TYPE,
context.dataFlowInfo,
context.trace);
JetType receiverType = receiverTypeInfo.getType();
if (selectorExpression == null) return TypeInfoForCall.create(null, context.dataFlowInfo);
if (receiverType == null)
receiverType = ErrorUtils.createErrorType("Type for " + expression.getText());
context = context.replaceDataFlowInfo(receiverTypeInfo.getDataFlowInfo());
if (selectorExpression instanceof JetSimpleNameExpression) {
ConstantUtils.propagateConstantValues(
expression, context.trace, (JetSimpleNameExpression) selectorExpression);
}
TypeInfoForCall selectorReturnTypeInfo =
getSelectorReturnTypeInfo(
new ExpressionReceiver(receiverExpression, receiverType),
expression.getOperationTokenNode(),
selectorExpression,
context,
resolveMode);
JetType selectorReturnType = selectorReturnTypeInfo.getType();
// TODO move further
if (!(receiverType instanceof NamespaceType)
&& expression.getOperationSign() == JetTokens.SAFE_ACCESS) {
if (selectorReturnType != null
&& !selectorReturnType.isNullable()
&& !KotlinBuiltIns.getInstance().isUnit(selectorReturnType)) {
if (receiverType.isNullable()) {
selectorReturnType = TypeUtils.makeNullable(selectorReturnType);
}
}
}
// TODO : this is suspicious: remove this code?
if (selectorReturnType != null) {
context.trace.record(BindingContext.EXPRESSION_TYPE, selectorExpression, selectorReturnType);
}
JetTypeInfo typeInfo =
JetTypeInfo.create(selectorReturnType, selectorReturnTypeInfo.getDataFlowInfo());
if (resolveMode == ResolveMode.TOP_LEVEL_CALL) {
DataFlowUtils.checkType(typeInfo.getType(), expression, context, typeInfo.getDataFlowInfo());
}
return TypeInfoForCall.create(typeInfo, selectorReturnTypeInfo);
}
@NotNull
private JetTypeInfo getSelectorReturnTypeInfo(
@NotNull ReceiverValue receiver,
@Nullable ASTNode callOperationNode,
@NotNull JetExpression selectorExpression,
@NotNull ResolutionContext context,
@NotNull ResolveMode resolveMode,
@NotNull ResolutionResultsCache resolutionResultsCache) {
if (selectorExpression instanceof JetCallExpression) {
return getCallExpressionTypeInfoWithoutFinalTypeCheck(
(JetCallExpression) selectorExpression,
receiver,
callOperationNode,
context,
resolveMode,
resolutionResultsCache);
} else if (selectorExpression instanceof JetSimpleNameExpression) {
return getSimpleNameExpressionTypeInfo(
(JetSimpleNameExpression) selectorExpression, receiver, callOperationNode, context);
} else if (selectorExpression instanceof JetQualifiedExpression) {
JetQualifiedExpression qualifiedExpression = (JetQualifiedExpression) selectorExpression;
JetExpression newReceiverExpression = qualifiedExpression.getReceiverExpression();
JetTypeInfo newReceiverTypeInfo =
getSelectorReturnTypeInfo(
receiver,
callOperationNode,
newReceiverExpression,
context.replaceExpectedType(NO_EXPECTED_TYPE),
resolveMode,
resolutionResultsCache);
JetType newReceiverType = newReceiverTypeInfo.getType();
DataFlowInfo newReceiverDataFlowInfo = newReceiverTypeInfo.getDataFlowInfo();
JetExpression newSelectorExpression = qualifiedExpression.getSelectorExpression();
if (newReceiverType != null && newSelectorExpression != null) {
ExpressionReceiver expressionReceiver =
new ExpressionReceiver(newReceiverExpression, newReceiverType);
return getSelectorReturnTypeInfo(
expressionReceiver,
qualifiedExpression.getOperationTokenNode(),
newSelectorExpression,
context.replaceDataFlowInfo(newReceiverDataFlowInfo),
resolveMode,
resolutionResultsCache);
}
} else {
context.trace.report(ILLEGAL_SELECTOR.on(selectorExpression, selectorExpression.getText()));
}
return JetTypeInfo.create(null, context.dataFlowInfo);
}
@Override
public JetTypeInfo visitBinaryExpression(
JetBinaryExpression expression, ExpressionTypingContext context) {
JetSimpleNameExpression operationSign = expression.getOperationReference();
IElementType operationType = operationSign.getReferencedNameElementType();
JetTypeInfo result;
if (operationType == JetTokens.EQ) {
result = visitAssignment(expression, context);
} else if (OperatorConventions.ASSIGNMENT_OPERATIONS.containsKey(operationType)) {
result = visitAssignmentOperation(expression, context);
} else {
return facade.getTypeInfo(expression, context);
}
return DataFlowUtils.checkType(result.getType(), expression, context, result.getDataFlowInfo());
}
@Override
public JetTypeInfo visitProperty(JetProperty property, ExpressionTypingContext context) {
JetTypeReference receiverTypeRef = property.getReceiverTypeRef();
if (receiverTypeRef != null) {
context.trace.report(LOCAL_EXTENSION_PROPERTY.on(receiverTypeRef));
}
JetPropertyAccessor getter = property.getGetter();
if (getter != null) {
context.trace.report(LOCAL_VARIABLE_WITH_GETTER.on(getter));
}
JetPropertyAccessor setter = property.getSetter();
if (setter != null) {
context.trace.report(LOCAL_VARIABLE_WITH_SETTER.on(setter));
}
VariableDescriptor propertyDescriptor =
context
.expressionTypingServices
.getDescriptorResolver()
.resolveLocalVariableDescriptor(
scope.getContainingDeclaration(),
scope,
property,
context.dataFlowInfo,
context.trace);
JetExpression initializer = property.getInitializer();
DataFlowInfo dataFlowInfo = context.dataFlowInfo;
if (initializer != null) {
JetType outType = propertyDescriptor.getType();
JetTypeInfo typeInfo =
facade.getTypeInfo(initializer, context.replaceExpectedType(outType).replaceScope(scope));
dataFlowInfo = typeInfo.getDataFlowInfo();
}
{
VariableDescriptor olderVariable = scope.getLocalVariable(propertyDescriptor.getName());
ExpressionTypingUtils.checkVariableShadowing(context, propertyDescriptor, olderVariable);
}
scope.addVariableDescriptor(propertyDescriptor);
ModifiersChecker.create(context.trace).checkModifiersForLocalDeclaration(property);
return DataFlowUtils.checkStatementType(property, context, dataFlowInfo);
}
@NotNull
public <D extends CallableDescriptor> JetTypeInfo getCallExpressionTypeInfo(
@NotNull JetCallExpression callExpression,
@NotNull ReceiverValue receiver,
@Nullable ASTNode callOperationNode,
@NotNull ResolutionContext context,
@NotNull ResolveMode resolveMode,
@NotNull ResolutionResultsCache resolutionResultsCache) {
JetTypeInfo typeInfo =
getCallExpressionTypeInfoWithoutFinalTypeCheck(
callExpression,
receiver,
callOperationNode,
context,
resolveMode,
resolutionResultsCache);
if (resolveMode == ResolveMode.TOP_LEVEL_CALL) {
DataFlowUtils.checkType(
typeInfo.getType(), callExpression, context, typeInfo.getDataFlowInfo());
}
return typeInfo;
}
@NotNull
protected JetTypeInfo visitAssignmentOperation(
JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
// There is a temporary binding trace for an opportunity to resolve set method for array if
// needed (the initial trace should be used there)
TemporaryBindingTrace temporaryBindingTrace =
TemporaryBindingTrace.create(
contextWithExpectedType.trace,
"trace to resolve array set method for binary expression",
expression);
ExpressionTypingContext context =
contextWithExpectedType
.replaceExpectedType(TypeUtils.NO_EXPECTED_TYPE)
.replaceBindingTrace(temporaryBindingTrace);
JetSimpleNameExpression operationSign = expression.getOperationReference();
IElementType operationType = operationSign.getReferencedNameElementType();
JetTypeInfo leftInfo = facade.getTypeInfo(expression.getLeft(), context);
JetType leftType = leftInfo.getType();
DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();
JetExpression right = expression.getRight();
JetExpression left = JetPsiUtil.deparenthesizeWithNoTypeResolution(expression.getLeft());
if (right == null || left == null) {
temporaryBindingTrace.commit();
return JetTypeInfo.create(null, dataFlowInfo);
}
if (leftType == null) {
dataFlowInfo =
facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
context.trace.report(UNRESOLVED_REFERENCE.on(operationSign));
temporaryBindingTrace.commit();
return JetTypeInfo.create(null, dataFlowInfo);
}
ExpressionReceiver receiver = new ExpressionReceiver(left, leftType);
// We check that defined only one of '+=' and '+' operations, and call it (in the case '+' we
// then also assign)
// Check for '+='
Name name = OperatorConventions.ASSIGNMENT_OPERATIONS.get(operationType);
TemporaryBindingTrace assignmentOperationTrace =
TemporaryBindingTrace.create(
context.trace, "trace to check assignment operation like '+=' for", expression);
OverloadResolutionResults<FunctionDescriptor> assignmentOperationDescriptors =
basic.getResolutionResultsForBinaryCall(
scope,
name,
context.replaceBindingTrace(assignmentOperationTrace),
expression,
receiver);
JetType assignmentOperationType =
OverloadResolutionResultsUtil.getResultType(assignmentOperationDescriptors);
// Check for '+'
Name counterpartName =
OperatorConventions.BINARY_OPERATION_NAMES.get(
OperatorConventions.ASSIGNMENT_OPERATION_COUNTERPARTS.get(operationType));
TemporaryBindingTrace binaryOperationTrace =
TemporaryBindingTrace.create(
context.trace, "trace to check binary operation like '+' for", expression);
OverloadResolutionResults<FunctionDescriptor> binaryOperationDescriptors =
basic.getResolutionResultsForBinaryCall(
scope,
counterpartName,
context.replaceBindingTrace(binaryOperationTrace),
expression,
receiver);
JetType binaryOperationType =
OverloadResolutionResultsUtil.getResultType(binaryOperationDescriptors);
JetType type = assignmentOperationType != null ? assignmentOperationType : binaryOperationType;
if (assignmentOperationType != null && binaryOperationType != null) {
OverloadResolutionResults<FunctionDescriptor> ambiguityResolutionResults =
OverloadResolutionResultsUtil.ambiguity(
assignmentOperationDescriptors, binaryOperationDescriptors);
context.trace.report(
ASSIGN_OPERATOR_AMBIGUITY.on(
operationSign, ambiguityResolutionResults.getResultingCalls()));
Collection<DeclarationDescriptor> descriptors = Sets.newHashSet();
for (ResolvedCall<? extends FunctionDescriptor> call :
ambiguityResolutionResults.getResultingCalls()) {
descriptors.add(call.getResultingDescriptor());
}
dataFlowInfo =
facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
context.trace.record(AMBIGUOUS_REFERENCE_TARGET, operationSign, descriptors);
} else if (assignmentOperationType != null) {
assignmentOperationTrace.commit();
if (!KotlinBuiltIns.getInstance().isUnit(assignmentOperationType)) {
context.trace.report(
ASSIGNMENT_OPERATOR_SHOULD_RETURN_UNIT.on(
operationSign,
assignmentOperationDescriptors.getResultingDescriptor(),
operationSign));
}
} else {
binaryOperationTrace.commit();
context.trace.record(VARIABLE_REASSIGNMENT, expression);
if (left instanceof JetArrayAccessExpression) {
ExpressionTypingContext contextForResolve =
context
.replaceScope(scope)
.replaceBindingTrace(
TemporaryBindingTrace.create(
contextWithExpectedType.trace,
"trace to resolve array set method for assignment",
expression));
basic.resolveArrayAccessSetMethod(
(JetArrayAccessExpression) left, right, contextForResolve, context.trace);
}
dataFlowInfo =
facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
}
basic.checkLValue(context.trace, expression.getLeft());
temporaryBindingTrace.commit();
return JetTypeInfo.create(
checkAssignmentType(type, expression, contextWithExpectedType), dataFlowInfo);
}