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More fixes for possible coercion to unit of type of last statement in block

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svtk
2011-10-10 20:45:42 +04:00
parent fc6879e7fd
commit 868e024c93
4 changed files with 107 additions and 30 deletions
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compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/Errors.java
+1
View File
@@ -192,6 +192,7 @@ public interface Errors {
SimpleDiagnosticFactory RETURN_IN_FUNCTION_WITH_EXPRESSION_BODY = SimpleDiagnosticFactory.create(ERROR, "Returns are not allowed for functions with expression body. Use block body in '{...}'");
SimpleDiagnosticFactory NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY = SimpleDiagnosticFactory.create(ERROR, "A 'return' expression required in a function with a block body ('{...}')");
ParameterizedDiagnosticFactory1<JetType> RETURN_TYPE_MISMATCH = ParameterizedDiagnosticFactory1.create(ERROR, "This function must return a value of type {0}");
ParameterizedDiagnosticFactory1<JetType> EXPECTED_TYPE_MISMATCH = ParameterizedDiagnosticFactory1.create(ERROR, "Expected a value of type {0}");
ParameterizedDiagnosticFactory1<JetType> UPPER_BOUND_VIOLATED = ParameterizedDiagnosticFactory1.create(ERROR, "An upper bound {0} is violated"); // TODO : Message
ParameterizedDiagnosticFactory1<JetType> FINAL_CLASS_OBJECT_UPPER_BOUND = ParameterizedDiagnosticFactory1.create(ERROR, "{0} is a final type, and thus a class object cannot extend it");
compiler/frontend/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java
+59 -29
View File
@@ -423,42 +423,61 @@ public class JetTypeInferrer {
trace.record(STATEMENT, statement);
final JetExpression statementExpression = (JetExpression) statement;
//TODO constructor assert context.expectedType != FORBIDDEN : ""
if (!iterator.hasNext() && context.expectedType != NO_EXPECTED_TYPE) {
if (coercionStrategyForLastExpression == CoercionStrategy.COERCION_TO_UNIT && JetStandardClasses.isUnit(context.expectedType)) {
// This implements coercion to Unit
TemporaryBindingTrace temporaryTraceExpectingUnit = TemporaryBindingTrace.create(trace);
final boolean[] mismatch = new boolean[1];
ObservableBindingTrace errorInterceptingTrace = makeTraceInterceptingTypeMismatch(temporaryTraceExpectingUnit, statementExpression, mismatch);
newContext = newContext(errorInterceptingTrace, scope, newContext.dataFlowInfo, context.expectedType, context.expectedReturnType);
result = blockLevelVisitor.getType(statementExpression, newContext);
if (mismatch[0]) {
TemporaryBindingTrace temporaryTraceNoExpectedType = TemporaryBindingTrace.create(trace);
mismatch[0] = false;
ObservableBindingTrace interceptingTrace = makeTraceInterceptingTypeMismatch(temporaryTraceNoExpectedType, statementExpression, mismatch);
newContext = newContext(interceptingTrace, scope, newContext.dataFlowInfo, NO_EXPECTED_TYPE, context.expectedReturnType);
if (!iterator.hasNext()) {
if (context.expectedType != NO_EXPECTED_TYPE) {
if (coercionStrategyForLastExpression == CoercionStrategy.COERCION_TO_UNIT && JetStandardClasses.isUnit(context.expectedType)) {
// This implements coercion to Unit
TemporaryBindingTrace temporaryTraceExpectingUnit = TemporaryBindingTrace.create(trace);
final boolean[] mismatch = new boolean[1];
ObservableBindingTrace errorInterceptingTrace = makeTraceInterceptingTypeMismatch(temporaryTraceExpectingUnit, statementExpression, mismatch);
newContext = newContext(errorInterceptingTrace, scope, newContext.dataFlowInfo, context.expectedType, context.expectedReturnType);
result = blockLevelVisitor.getType(statementExpression, newContext);
if (mismatch[0]) {
temporaryTraceExpectingUnit.commit();
TemporaryBindingTrace temporaryTraceNoExpectedType = TemporaryBindingTrace.create(trace);
mismatch[0] = false;
ObservableBindingTrace interceptingTrace = makeTraceInterceptingTypeMismatch(temporaryTraceNoExpectedType, statementExpression, mismatch);
newContext = newContext(interceptingTrace, scope, newContext.dataFlowInfo, NO_EXPECTED_TYPE, context.expectedReturnType);
result = blockLevelVisitor.getType(statementExpression, newContext);
if (mismatch[0]) {
temporaryTraceExpectingUnit.commit();
}
else {
temporaryTraceNoExpectedType.commit();
}
}
else {
temporaryTraceNoExpectedType.commit();
temporaryTraceExpectingUnit.commit();
}
}
else {
temporaryTraceExpectingUnit.commit();
newContext = newContext(trace, scope, newContext.dataFlowInfo, context.expectedType, context.expectedReturnType);
result = blockLevelVisitor.getType(statementExpression, newContext);
}
}
else {
newContext = newContext(trace, scope, newContext.dataFlowInfo, context.expectedType, context.expectedReturnType);
result = blockLevelVisitor.getType(statementExpression, newContext);
if (coercionStrategyForLastExpression == CoercionStrategy.COERCION_TO_UNIT) {
boolean mightBeUnit = false;
if (statementExpression instanceof JetDeclaration) {
mightBeUnit = true;
}
if (statementExpression instanceof JetBinaryExpression) {
JetBinaryExpression binaryExpression = (JetBinaryExpression) statementExpression;
IElementType operationType = binaryExpression.getOperationToken();
if (operationType == JetTokens.EQ || assignmentOperationNames.containsKey(operationType)) {
mightBeUnit = true;
}
}
if (mightBeUnit) {
// TypeInferrerVisitorWithWritableScope should return only null or Unit for declarations and assignments
assert result == null || JetStandardClasses.isUnit(result);
result = JetStandardClasses.getUnitType();
}
}
}
}
else {
result = blockLevelVisitor.getType(statementExpression, newContext);
if (coercionStrategyForLastExpression == CoercionStrategy.COERCION_TO_UNIT && result == null) {
result = JetStandardClasses.getUnitType();
}
}
DataFlowInfo newDataFlowInfo = blockLevelVisitor.getResultingDataFlowInfo();
@@ -1023,8 +1042,8 @@ public class JetTypeInferrer {
if (functionTypeExpected) {
JetType expectedReturnType = JetStandardClasses.getReturnType(expectedType);
functionDescriptor.setReturnType(expectedReturnType);
if (JetStandardClasses.isUnit(expectedReturnType)) {
functionDescriptor.setReturnType(expectedReturnType);
return context.services.checkType(JetStandardClasses.getFunctionType(Collections.<AnnotationDescriptor>emptyList(), effectiveReceiverType, parameterTypes, expectedReturnType), expression, context);
}
@@ -2335,10 +2354,10 @@ public class JetTypeInferrer {
result = getTypeForBinaryCall(context.scope, binaryOperationNames.get(operationType), context, expression);
}
else if (operationType == JetTokens.EQ) {
result = visitAssignment(expression, context);
result = visitAssignment(expression, contextWithExpectedType);
}
else if (assignmentOperationNames.containsKey(operationType)) {
result = visitAssignmentOperation(expression, context);
result = visitAssignmentOperation(expression, contextWithExpectedType);
}
else if (comparisonOperations.contains(operationType)) {
JetType compareToReturnType = getTypeForBinaryCall(context.scope, "compareTo", context, expression);
@@ -2652,7 +2671,7 @@ public class JetTypeInferrer {
PropertyDescriptor propertyDescriptor = context.classDescriptorResolver.resolveObjectDeclarationAsPropertyDescriptor(scope.getContainingDeclaration(), declaration, classDescriptor);
scope.addVariableDescriptor(propertyDescriptor);
}
return null;
return checkExpectedType(declaration, context);
}
@Override
@@ -2688,7 +2707,7 @@ public class JetTypeInferrer {
}
scope.addVariableDescriptor(propertyDescriptor);
return null;
return checkExpectedType(property, context);
}
@Override
@@ -2696,7 +2715,7 @@ public class JetTypeInferrer {
FunctionDescriptorImpl functionDescriptor = context.classDescriptorResolver.resolveFunctionDescriptor(scope.getContainingDeclaration(), scope, function);
scope.addFunctionDescriptor(functionDescriptor);
context.services.checkFunctionReturnType(context.scope, function, functionDescriptor, context.dataFlowInfo);
return null;
return checkExpectedType(function, context);
}
@Override
@@ -2711,7 +2730,7 @@ public class JetTypeInferrer {
@Override
public JetType visitDeclaration(JetDeclaration dcl, TypeInferenceContext context) {
return visitJetElement(dcl, context);
return checkExpectedType(dcl, context);
}
@Override
@@ -2733,6 +2752,17 @@ public class JetTypeInferrer {
else {
temporaryBindingTrace.commit();
}
return checkExpectedType(expression, context);
}
@Nullable
private JetType checkExpectedType(JetExpression expression, TypeInferenceContext context) {
if (context.expectedType != NO_EXPECTED_TYPE) {
if (JetStandardClasses.isUnit(context.expectedType)) {
return JetStandardClasses.getUnitType();
}
context.trace.report(EXPECTED_TYPE_MISMATCH.on(expression, context.expectedType));
}
return null;
}
@@ -2765,7 +2795,7 @@ public class JetTypeInferrer {
}
}
}
return null;
return checkExpectedType(expression, context);
}
private JetType resolveArrayAccessToLValue(JetArrayAccessExpression arrayAccessExpression, JetExpression rightHandSide, JetSimpleNameExpression operationSign, TypeInferenceContext context) {