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StaticTypeCheckingVisitor.java
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StaticTypeCheckingVisitor.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.transform.stc;
import groovy.lang.Closure;
import groovy.lang.DelegatesTo;
import groovy.lang.IntRange;
import groovy.lang.Range;
import groovy.transform.TypeChecked;
import groovy.transform.TypeCheckingMode;
import groovy.transform.stc.ClosureParams;
import groovy.transform.stc.ClosureSignatureConflictResolver;
import groovy.transform.stc.ClosureSignatureHint;
import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.AnnotatedNode;
import org.codehaus.groovy.ast.AnnotationNode;
import org.codehaus.groovy.ast.ClassCodeVisitorSupport;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.ConstructorNode;
import org.codehaus.groovy.ast.DynamicVariable;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.GenericsType;
import org.codehaus.groovy.ast.InnerClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.PropertyNode;
import org.codehaus.groovy.ast.Variable;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.ast.stmt.CaseStatement;
import org.codehaus.groovy.ast.stmt.CatchStatement;
import org.codehaus.groovy.ast.stmt.EmptyStatement;
import org.codehaus.groovy.ast.stmt.ForStatement;
import org.codehaus.groovy.ast.stmt.IfStatement;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.ast.stmt.SwitchStatement;
import org.codehaus.groovy.ast.stmt.TryCatchStatement;
import org.codehaus.groovy.ast.stmt.WhileStatement;
import org.codehaus.groovy.ast.tools.GenericsUtils;
import org.codehaus.groovy.ast.tools.WideningCategories;
import org.codehaus.groovy.classgen.ReturnAdder;
import org.codehaus.groovy.classgen.asm.InvocationWriter;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.ErrorCollector;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.messages.SyntaxErrorMessage;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.codehaus.groovy.runtime.MetaClassHelper;
import org.codehaus.groovy.syntax.SyntaxException;
import org.codehaus.groovy.syntax.Token;
import org.codehaus.groovy.syntax.TokenUtil;
import org.codehaus.groovy.transform.StaticTypesTransformation;
import org.codehaus.groovy.transform.trait.Traits;
import org.codehaus.groovy.util.ListHashMap;
import org.objectweb.asm.Opcodes;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import static org.codehaus.groovy.ast.ClassHelper.*;
import static org.codehaus.groovy.ast.tools.WideningCategories.LowestUpperBoundClassNode;
import static org.codehaus.groovy.ast.tools.WideningCategories.isBigDecCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isBigIntCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isDouble;
import static org.codehaus.groovy.ast.tools.WideningCategories.isDoubleCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isFloat;
import static org.codehaus.groovy.ast.tools.WideningCategories.isFloatingCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isIntCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isLongCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.isNumberCategory;
import static org.codehaus.groovy.ast.tools.WideningCategories.lowestUpperBound;
import static org.codehaus.groovy.syntax.Types.ASSIGN;
import static org.codehaus.groovy.syntax.Types.ASSIGNMENT_OPERATOR;
import static org.codehaus.groovy.syntax.Types.COMPARE_EQUAL;
import static org.codehaus.groovy.syntax.Types.COMPARE_NOT_EQUAL;
import static org.codehaus.groovy.syntax.Types.COMPARE_TO;
import static org.codehaus.groovy.syntax.Types.DIVIDE;
import static org.codehaus.groovy.syntax.Types.DIVIDE_EQUAL;
import static org.codehaus.groovy.syntax.Types.EQUAL;
import static org.codehaus.groovy.syntax.Types.FIND_REGEX;
import static org.codehaus.groovy.syntax.Types.KEYWORD_IN;
import static org.codehaus.groovy.syntax.Types.KEYWORD_INSTANCEOF;
import static org.codehaus.groovy.syntax.Types.LEFT_SQUARE_BRACKET;
import static org.codehaus.groovy.syntax.Types.MINUS_MINUS;
import static org.codehaus.groovy.syntax.Types.MOD;
import static org.codehaus.groovy.syntax.Types.MOD_EQUAL;
import static org.codehaus.groovy.syntax.Types.PLUS_PLUS;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.*;
/**
* The main class code visitor responsible for static type checking. It will perform various inspections like checking
* assignment types, type inference, ... Eventually, class nodes may be annotated with inferred type information.
*
* @author Cedric Champeau
* @author Jochen Theodorou
*/
public class StaticTypeCheckingVisitor extends ClassCodeVisitorSupport {
private static final boolean DEBUG_GENERATED_CODE = Boolean.valueOf(System.getProperty("groovy.stc.debug", "false"));
private static final AtomicLong UNIQUE_LONG = new AtomicLong();
protected static final Object ERROR_COLLECTOR = ErrorCollector.class;
protected static final ClassNode ITERABLE_TYPE = ClassHelper.make(Iterable.class);
protected static final List<MethodNode> EMPTY_METHODNODE_LIST = Collections.emptyList();
protected static final ClassNode TYPECHECKED_CLASSNODE = ClassHelper.make(TypeChecked.class);
protected static final ClassNode[] TYPECHECKING_ANNOTATIONS = new ClassNode[]{TYPECHECKED_CLASSNODE};
protected static final ClassNode TYPECHECKING_INFO_NODE = ClassHelper.make(TypeChecked.TypeCheckingInfo.class);
protected static final ClassNode DGM_CLASSNODE = ClassHelper.make(DefaultGroovyMethods.class);
protected static final int CURRENT_SIGNATURE_PROTOCOL_VERSION = 1;
protected static final Expression CURRENT_SIGNATURE_PROTOCOL = new ConstantExpression(CURRENT_SIGNATURE_PROTOCOL_VERSION, true);
protected static final MethodNode GET_DELEGATE = CLOSURE_TYPE.getGetterMethod("getDelegate");
protected static final MethodNode GET_OWNER = CLOSURE_TYPE.getGetterMethod("getOwner");
protected static final MethodNode GET_THISOBJECT = CLOSURE_TYPE.getGetterMethod("getThisObject");
protected static final ClassNode DELEGATES_TO = ClassHelper.make(DelegatesTo.class);
protected static final ClassNode DELEGATES_TO_TARGET = ClassHelper.make(DelegatesTo.Target.class);
protected static final ClassNode LINKEDHASHMAP_CLASSNODE = make(LinkedHashMap.class);
protected static final ClassNode CLOSUREPARAMS_CLASSNODE = make(ClosureParams.class);
protected static final ClassNode MAP_ENTRY_TYPE = make(Map.Entry.class);
protected static final ClassNode ENUMERATION_TYPE = make(Enumeration.class);
public static final Statement GENERATED_EMPTY_STATEMENT = new EmptyStatement();
public static final MethodNode CLOSURE_CALL_NO_ARG;
public static final MethodNode CLOSURE_CALL_ONE_ARG;
public static final MethodNode CLOSURE_CALL_VARGS;
static {
// Cache closure call methods
CLOSURE_CALL_NO_ARG = CLOSURE_TYPE.getDeclaredMethod("call", Parameter.EMPTY_ARRAY);
CLOSURE_CALL_ONE_ARG = CLOSURE_TYPE.getDeclaredMethod("call", new Parameter[]{
new Parameter(OBJECT_TYPE, "arg")
});
CLOSURE_CALL_VARGS = CLOSURE_TYPE.getDeclaredMethod("call", new Parameter[]{
new Parameter(OBJECT_TYPE.makeArray(), "args")
});
}
private static final String[] EMPTY_STRING_ARRAY = new String[0];
protected final ReturnAdder.ReturnStatementListener returnListener = new ReturnAdder.ReturnStatementListener() {
public void returnStatementAdded(final ReturnStatement returnStatement) {
if (returnStatement.getExpression() == ConstantExpression.NULL) return;
if (isNullConstant(returnStatement.getExpression())) return;
checkReturnType(returnStatement);
if (typeCheckingContext.getEnclosingClosure()!=null) {
addClosureReturnType(getType(returnStatement.getExpression()));
} else if (typeCheckingContext.getEnclosingMethod() != null) {
} else {
throw new GroovyBugError("Unexpected return statement at "
+ returnStatement.getLineNumber()+":"+returnStatement.getColumnNumber()
+ " "+returnStatement.getText());
}
}
};
protected final ReturnAdder returnAdder = new ReturnAdder(returnListener);
protected TypeCheckingContext typeCheckingContext;
protected DefaultTypeCheckingExtension extension;
public StaticTypeCheckingVisitor(SourceUnit source, ClassNode cn) {
this.typeCheckingContext = new TypeCheckingContext(this);
this.extension = createDefaultTypeCheckingExtension();
this.typeCheckingContext.source = source;
this.typeCheckingContext.pushEnclosingClassNode(cn);
this.typeCheckingContext.pushErrorCollector(source.getErrorCollector());
this.typeCheckingContext.pushTemporaryTypeInfo();
}
private DefaultTypeCheckingExtension createDefaultTypeCheckingExtension() {
DefaultTypeCheckingExtension ext = new DefaultTypeCheckingExtension(this);
ext.addHandler(new TraitTypeCheckingExtension(this));
return ext;
}
// @Override
protected SourceUnit getSourceUnit() {
return typeCheckingContext.source;
}
public void initialize() {
extension.setup();
}
/**
* Returns the current type checking context. The context is used internally by the type
* checker during type checking to store various state data.
*
* @return the type checking context
*/
public TypeCheckingContext getTypeCheckingContext() {
return typeCheckingContext;
}
public void addTypeCheckingExtension(TypeCheckingExtension extension) {
this.extension.addHandler(extension);
}
public void setCompilationUnit(CompilationUnit cu) {
typeCheckingContext.setCompilationUnit(cu);
}
@Override
public void visitClass(final ClassNode node) {
if (shouldSkipClassNode(node)) return;
if (extension.beforeVisitClass(node)) {
extension.afterVisitClass(node);
return;
}
Object type = node.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE);
if (type != null) {
// transformation has already been run on this class node
// so we'll use a silent collector in order not to duplicate errors
typeCheckingContext.pushErrorCollector();
}
typeCheckingContext.pushEnclosingClassNode(node);
Set<MethodNode> oldVisitedMethod = typeCheckingContext.alreadyVisitedMethods;
typeCheckingContext.alreadyVisitedMethods = new LinkedHashSet<MethodNode>();
super.visitClass(node);
Iterator<InnerClassNode> innerClasses = node.getInnerClasses();
while (innerClasses.hasNext()) {
InnerClassNode innerClassNode = innerClasses.next();
visitClass(innerClassNode);
}
typeCheckingContext.alreadyVisitedMethods = oldVisitedMethod;
node.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, node);
// mark all methods as visited. We can't do this in visitMethod because the type checker
// works in a two pass sequence and we don't want to skip the second pass
for (MethodNode methodNode : node.getMethods()) {
methodNode.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE);
}
for (ConstructorNode constructorNode : node.getDeclaredConstructors()) {
constructorNode.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE);
}
extension.afterVisitClass(node);
}
protected boolean shouldSkipClassNode(final ClassNode node) {
if (isSkipMode(node)) return true;
return false;
}
/**
* Returns the list of type checking annotations class nodes. Subclasses may override this method
* in order to provide additional classes which must be looked up when checking if a method or
* a class node should be skipped.
* <p>
* The default implementation returns {@link TypeChecked}.
*
* @return array of class nodes
*/
protected ClassNode[] getTypeCheckingAnnotations() {
return TYPECHECKING_ANNOTATIONS;
}
public boolean isSkipMode(final AnnotatedNode node) {
if (node == null) return false;
for (ClassNode tca : getTypeCheckingAnnotations()) {
List<AnnotationNode> annotations = node.getAnnotations(tca);
if (annotations != null) {
for (AnnotationNode annotation : annotations) {
Expression value = annotation.getMember("value");
if (value != null) {
if (value instanceof ConstantExpression) {
ConstantExpression ce = (ConstantExpression) value;
if (TypeCheckingMode.SKIP.toString().equals(ce.getValue().toString())) return true;
} else if (value instanceof PropertyExpression) {
PropertyExpression pe = (PropertyExpression) value;
if (TypeCheckingMode.SKIP.toString().equals(pe.getPropertyAsString())) return true;
}
}
}
}
}
if (node instanceof MethodNode) {
return isSkipMode(node.getDeclaringClass());
}
if (isSkippedInnerClass(node)) return true;
return false;
}
/**
* Test if a node is an inner class node, and if it is, then checks if the enclosing method is skipped.
* @param node
* @return true if the inner class node should be skipped
*/
protected boolean isSkippedInnerClass(AnnotatedNode node) {
if (!(node instanceof InnerClassNode)) return false;
MethodNode enclosingMethod = ((InnerClassNode) node).getEnclosingMethod();
return enclosingMethod != null && isSkipMode(enclosingMethod);
}
@Override
public void visitClassExpression(final ClassExpression expression) {
super.visitClassExpression(expression);
ClassNode cn = (ClassNode) expression.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE);
if (cn == null) {
storeType(expression, getType(expression));
}
}
@SuppressWarnings("unchecked")
private static void addPrivateFieldOrMethodAccess(Expression source, ClassNode cn, StaticTypesMarker type, ASTNode accessedMember) {
Set<ASTNode> set = (Set<ASTNode>) cn.getNodeMetaData(type);
if (set==null) {
set = new LinkedHashSet<ASTNode>();
cn.putNodeMetaData(type, set);
}
set.add(accessedMember);
source.putNodeMetaData(type, accessedMember);
}
/**
* Given a field node, checks if we are accessing or setting a private field from an inner class.
*/
private void checkOrMarkPrivateAccess(Expression source, FieldNode fn, boolean lhsOfAssignment) {
if (fn!=null && Modifier.isPrivate(fn.getModifiers()) &&
(fn.getDeclaringClass() != typeCheckingContext.getEnclosingClassNode() || typeCheckingContext.getEnclosingClosure()!=null) &&
fn.getDeclaringClass().getModule() == typeCheckingContext.getEnclosingClassNode().getModule()) {
StaticTypesMarker marker = lhsOfAssignment ? StaticTypesMarker.PV_FIELDS_MUTATION : StaticTypesMarker.PV_FIELDS_ACCESS;
addPrivateFieldOrMethodAccess(source, fn.getDeclaringClass(), marker, fn);
}
}
/**
* Given a method node, checks if we are calling a private method from an inner class.
*/
private void checkOrMarkPrivateAccess(Expression source, MethodNode mn) {
if (mn==null) {
return;
}
ClassNode declaringClass = mn.getDeclaringClass();
ClassNode enclosingClassNode = typeCheckingContext.getEnclosingClassNode();
if (declaringClass != enclosingClassNode || typeCheckingContext.getEnclosingClosure() != null) {
int mods = mn.getModifiers();
boolean sameModule = declaringClass.getModule() == enclosingClassNode.getModule();
String packageName = declaringClass.getPackageName();
if (packageName==null) {
packageName = "";
}
if ((Modifier.isPrivate(mods) && sameModule)) {
addPrivateFieldOrMethodAccess(source, declaringClass, StaticTypesMarker.PV_METHODS_ACCESS, mn);
} else if (Modifier.isProtected(mods) && !packageName.equals(enclosingClassNode.getPackageName())
&& !implementsInterfaceOrIsSubclassOf(enclosingClassNode, declaringClass)) {
ClassNode cn = enclosingClassNode;
while ((cn = cn.getOuterClass()) != null) {
if (implementsInterfaceOrIsSubclassOf(cn, declaringClass)) {
addPrivateFieldOrMethodAccess(source, cn, StaticTypesMarker.PV_METHODS_ACCESS, mn);
break;
}
}
}
}
}
private void checkSuperCallFromClosure(Expression call, MethodNode directCallTarget) {
if (call instanceof MethodCallExpression && typeCheckingContext.getEnclosingClosure() != null) {
Expression objectExpression = ((MethodCallExpression)call).getObjectExpression();
if (objectExpression instanceof VariableExpression) {
VariableExpression var = (VariableExpression) objectExpression;
if (var.isSuperExpression()) {
ClassNode current = typeCheckingContext.getEnclosingClassNode();
LinkedList<MethodNode> list = current.getNodeMetaData(StaticTypesMarker.SUPER_MOP_METHOD_REQUIRED);
if (list == null) {
list = new LinkedList<MethodNode>();
current.putNodeMetaData(StaticTypesMarker.SUPER_MOP_METHOD_REQUIRED, list);
}
list.add(directCallTarget);
call.putNodeMetaData(StaticTypesMarker.SUPER_MOP_METHOD_REQUIRED, current);
}
}
}
}
/**
* wrap type in Class<> if usingClass==true
*/
private static ClassNode makeType(ClassNode cn, boolean usingClass) {
if (usingClass) {
ClassNode clazzType = CLASS_Type.getPlainNodeReference();
clazzType.setGenericsTypes(new GenericsType[] {new GenericsType(cn)});
return clazzType;
} else {
return cn;
}
}
private boolean storeTypeForThis(VariableExpression vexp) {
if (vexp == VariableExpression.THIS_EXPRESSION) return true;
if (!vexp.isThisExpression()) return false;
ClassNode enclosingClassNode = typeCheckingContext.getEnclosingClassNode();
storeType(vexp, makeType(enclosingClassNode, typeCheckingContext.isInStaticContext));
return true;
}
private boolean storeTypeForSuper(VariableExpression vexp) {
if (vexp == VariableExpression.SUPER_EXPRESSION) return true;
if (!vexp.isSuperExpression()) return false;
ClassNode superClassNode = typeCheckingContext.getEnclosingClassNode().getSuperClass();
storeType(vexp, makeType(superClassNode, typeCheckingContext.isInStaticContext));
return true;
}
@Override
public void visitVariableExpression(VariableExpression vexp) {
super.visitVariableExpression(vexp);
if (storeTypeForThis(vexp)) return;
if (storeTypeForSuper(vexp)) return;
if (vexp.getAccessedVariable() instanceof PropertyNode) {
// we must be careful, because the property node may be of a wrong type:
// if a class contains a getter and a setter of different types or
// overloaded setters, the type of the property node is arbitrary!
if (tryVariableExpressionAsProperty(vexp, vexp.getName())) {
BinaryExpression enclosingBinaryExpression = typeCheckingContext.getEnclosingBinaryExpression();
if (enclosingBinaryExpression != null) {
Expression leftExpression = enclosingBinaryExpression.getLeftExpression();
Expression rightExpression = enclosingBinaryExpression.getRightExpression();
SetterInfo setterInfo = removeSetterInfo(leftExpression);
if (setterInfo != null) {
if (!ensureValidSetter(vexp, leftExpression, rightExpression, setterInfo)) {
return;
}
}
}
}
}
TypeCheckingContext.EnclosingClosure enclosingClosure = typeCheckingContext.getEnclosingClosure();
if (enclosingClosure != null) {
String name = vexp.getName();
if (name.equals("owner") || name.equals("thisObject")) {
storeType(vexp, typeCheckingContext.getEnclosingClassNode());
return;
} else if ("delegate".equals(name)) {
DelegationMetadata md = getDelegationMetadata(enclosingClosure.getClosureExpression());
ClassNode type = typeCheckingContext.getEnclosingClassNode();
if (md!=null) type = md.getType();
storeType(vexp, type);
return;
}
}
if (! (vexp.getAccessedVariable() instanceof DynamicVariable)) return;
// a dynamic variable is either an undeclared variable
// or a member of a class used in a 'with'
DynamicVariable dyn = (DynamicVariable) vexp.getAccessedVariable();
// first, we must check the 'with' context
String dynName = dyn.getName();
if (tryVariableExpressionAsProperty(vexp, dynName)) return;
if (!extension.handleUnresolvedVariableExpression(vexp)) {
addStaticTypeError("The variable [" + vexp.getName() + "] is undeclared.", vexp);
}
}
private boolean tryVariableExpressionAsProperty(final VariableExpression vexp, final String dynName) {
VariableExpression implicitThis = new VariableExpression("this");
PropertyExpression pe = new PropertyExpression(implicitThis, dynName);
pe.setImplicitThis(true);
if (visitPropertyExpressionSilent(pe, vexp)) {
ClassNode previousIt = vexp.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE);
vexp.copyNodeMetaData(implicitThis);
vexp.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, previousIt);
storeType(vexp, getType(pe));
Object val = pe.getNodeMetaData(StaticTypesMarker.READONLY_PROPERTY);
if (val!=null) vexp.putNodeMetaData(StaticTypesMarker.READONLY_PROPERTY,val);
val = pe.getNodeMetaData(StaticTypesMarker.IMPLICIT_RECEIVER);
if (val!=null) vexp.putNodeMetaData(StaticTypesMarker.IMPLICIT_RECEIVER,val);
return true;
}
return false;
}
private boolean visitPropertyExpressionSilent(PropertyExpression pe, Expression lhsPart) {
return (existsProperty(pe, !isLHSOfEnclosingAssignment(lhsPart)));
}
@Override
public void visitPropertyExpression(final PropertyExpression pexp) {
if (visitPropertyExpressionSilent(pexp,pexp)) return;
if (!extension.handleUnresolvedProperty(pexp)) {
Expression objectExpression = pexp.getObjectExpression();
addStaticTypeError("No such property: " + pexp.getPropertyAsString() +
" for class: " + findCurrentInstanceOfClass(objectExpression, getType(objectExpression)).toString(false), pexp);
}
}
private boolean isLHSOfEnclosingAssignment(final Expression expression) {
final BinaryExpression ec = typeCheckingContext.getEnclosingBinaryExpression();
return ec != null && ec.getLeftExpression() == expression && isAssignment(ec.getOperation().getType());
}
@Override
public void visitAttributeExpression(final AttributeExpression expression) {
super.visitAttributeExpression(expression);
if (!existsProperty(expression, true) && !extension.handleUnresolvedAttribute(expression)) {
Expression objectExpression = expression.getObjectExpression();
addStaticTypeError("No such property: " + expression.getPropertyAsString() +
" for class: " + findCurrentInstanceOfClass(objectExpression, objectExpression.getType()), expression);
}
}
@Override
public void visitRangeExpression(final RangeExpression expression) {
super.visitRangeExpression(expression);
ClassNode fromType = getWrapper(getType(expression.getFrom()));
ClassNode toType = getWrapper(getType(expression.getTo()));
if (Integer_TYPE.equals(fromType) && Integer_TYPE.equals(toType)) {
storeType(expression, ClassHelper.make(IntRange.class));
} else {
ClassNode rangeType = ClassHelper.make(Range.class).getPlainNodeReference();
rangeType.setGenericsTypes(new GenericsType[] { new GenericsType(WideningCategories.lowestUpperBound(fromType, toType))});
storeType(expression, rangeType);
}
}
@Override
public void visitBinaryExpression(BinaryExpression expression) {
BinaryExpression enclosingBinaryExpression = typeCheckingContext.getEnclosingBinaryExpression();
typeCheckingContext.pushEnclosingBinaryExpression(expression);
try {
final Expression leftExpression = expression.getLeftExpression();
final Expression rightExpression = expression.getRightExpression();
int op = expression.getOperation().getType();
leftExpression.visit(this);
SetterInfo setterInfo = removeSetterInfo(leftExpression);
if (setterInfo != null) {
if (ensureValidSetter(expression, leftExpression, rightExpression, setterInfo)) {
return;
}
} else {
rightExpression.visit(this);
}
ClassNode lType = getType(leftExpression);
ClassNode rType = getType(rightExpression);
if (isNullConstant(rightExpression)) {
if (!isPrimitiveType(lType))
rType = UNKNOWN_PARAMETER_TYPE; // primitive types should be ignored as they will result in another failure
}
BinaryExpression reversedBinaryExpression = new BinaryExpression(rightExpression, expression.getOperation(), leftExpression);
ClassNode resultType = op==KEYWORD_IN
?getResultType(rType,op,lType,reversedBinaryExpression)
:getResultType(lType, op, rType, expression);
if (op==KEYWORD_IN) {
// in case of the "in" operator, the receiver and the arguments are reversed
// so we use the reversedExpression and get the target method from it
storeTargetMethod(expression, (MethodNode) reversedBinaryExpression.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET));
} else if (op == LEFT_SQUARE_BRACKET
&& leftExpression instanceof VariableExpression
&& leftExpression.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE)==null) {
storeType(leftExpression, lType);
}
if (resultType == null) {
resultType = lType;
}
// if left expression is a closure shared variable, a second pass should be done
if (leftExpression instanceof VariableExpression) {
VariableExpression leftVar = (VariableExpression) leftExpression;
if (leftVar.isClosureSharedVariable()) {
// if left expression is a closure shared variable, we should check it twice
// see GROOVY-5874
typeCheckingContext.secondPassExpressions.add(new SecondPassExpression<Void>(expression));
}
}
if (lType.isUsingGenerics() && missesGenericsTypes(resultType) && isAssignment(op)) {
// unchecked assignment
// examples:
// List<A> list = new LinkedList()
// List<A> list = []
// Iterable<A> list = new LinkedList()
// in that case, the inferred type of the binary expression is the type of the RHS
// "completed" with generics type information available in the LHS
ClassNode completedType = GenericsUtils.parameterizeType(lType, resultType.getPlainNodeReference());
resultType = completedType;
}
if (isArrayOp(op) &&
enclosingBinaryExpression != null
&& enclosingBinaryExpression.getLeftExpression() == expression
&& isAssignment(enclosingBinaryExpression.getOperation().getType())
&& !lType.isArray()) {
// left hand side of an assignment : map['foo'] = ...
Expression enclosingBE_rightExpr = enclosingBinaryExpression.getRightExpression();
if (!(enclosingBE_rightExpr instanceof ClosureExpression)) {
enclosingBE_rightExpr.visit(this);
}
ClassNode[] arguments = {rType, getType(enclosingBE_rightExpr)};
List<MethodNode> nodes = findMethod(lType.redirect(), "putAt", arguments);
if (nodes.size() == 1) {
typeCheckMethodsWithGenericsOrFail(lType, arguments, nodes.get(0), enclosingBE_rightExpr);
} else if (nodes.isEmpty()) {
addNoMatchingMethodError(lType, "putAt", arguments, enclosingBinaryExpression);
}
}
boolean isEmptyDeclaration = expression instanceof DeclarationExpression && rightExpression instanceof EmptyExpression;
if (!isEmptyDeclaration && isAssignment(op)) {
if (rightExpression instanceof ConstructorCallExpression) {
inferDiamondType((ConstructorCallExpression) rightExpression, lType);
}
ClassNode originType = getOriginalDeclarationType(leftExpression);
typeCheckAssignment(expression, leftExpression, originType, rightExpression, resultType);
// if assignment succeeds but result type is not a subtype of original type, then we are in a special cast handling
// and we must update the result type
if (!implementsInterfaceOrIsSubclassOf(getWrapper(resultType), getWrapper(originType))) {
resultType = originType;
} else if (lType.isUsingGenerics() && !lType.isEnum() && hasRHSIncompleteGenericTypeInfo(resultType)) {
// for example, LHS is List<ConcreteClass> and RHS is List<T> where T is a placeholder
resultType = lType;
}
// make sure we keep primitive types
if (isPrimitiveType(originType) && resultType.equals(getWrapper(originType))) {
resultType = originType;
}
// if we are in an if/else branch, keep track of assignment
if (typeCheckingContext.ifElseForWhileAssignmentTracker != null && leftExpression instanceof VariableExpression
&& !isNullConstant(rightExpression)) {
Variable accessedVariable = ((VariableExpression) leftExpression).getAccessedVariable();
if (accessedVariable instanceof VariableExpression) {
VariableExpression var = (VariableExpression) accessedVariable;
List<ClassNode> types = typeCheckingContext.ifElseForWhileAssignmentTracker.get(var);
if (types == null) {
types = new LinkedList<ClassNode>();
ClassNode type = var.getNodeMetaData(StaticTypesMarker.INFERRED_TYPE);
types.add(type);
typeCheckingContext.ifElseForWhileAssignmentTracker.put(var, types);
}
types.add(resultType);
}
}
storeType(leftExpression, resultType);
// if right expression is a ClosureExpression, store parameter type information
if (leftExpression instanceof VariableExpression) {
if (rightExpression instanceof ClosureExpression) {
Parameter[] parameters = ((ClosureExpression) rightExpression).getParameters();
leftExpression.putNodeMetaData(StaticTypesMarker.CLOSURE_ARGUMENTS, parameters);
} else if (rightExpression instanceof VariableExpression &&
((VariableExpression)rightExpression).getAccessedVariable() instanceof Expression &&
((Expression)((VariableExpression)rightExpression).getAccessedVariable()).getNodeMetaData(StaticTypesMarker.CLOSURE_ARGUMENTS)!=null) {
Variable targetVariable = findTargetVariable((VariableExpression)leftExpression);
if (targetVariable instanceof ASTNode) {
((ASTNode)targetVariable).putNodeMetaData(
StaticTypesMarker.CLOSURE_ARGUMENTS,
((Expression)((VariableExpression)rightExpression).getAccessedVariable()).getNodeMetaData(StaticTypesMarker.CLOSURE_ARGUMENTS));
}
}
}
} else if (op == KEYWORD_INSTANCEOF) {
pushInstanceOfTypeInfo(leftExpression, rightExpression);
}
if (!isEmptyDeclaration) {
storeType(expression, resultType);
}
} finally {
typeCheckingContext.popEnclosingBinaryExpression();
}
}
/**
* Given a binary expression corresponding to an assignment, will check that the type of the RHS matches one
* of the possible setters and if not, throw a type checking error.
* @param expression the assignment expression
* @param leftExpression left expression of the assignment
* @param rightExpression right expression of the assignment
* @param setterInfo possible setters
* @return true if type checking passed
*/
private boolean ensureValidSetter(final Expression expression, final Expression leftExpression, final Expression rightExpression, final SetterInfo setterInfo) {
// for expressions like foo = { ... }
// we know that the RHS type is a closure
// but we must check if the binary expression is an assignment
// because we need to check if a setter uses @DelegatesTo
VariableExpression ve = new VariableExpression("%", setterInfo.receiverType);
// for compound assignment "x op= y" find type as if it was "x = (x op y)"
final Expression newRightExpression = isCompoundAssignment(expression)
? new BinaryExpression(leftExpression, getOpWithoutEqual(expression), rightExpression)
: rightExpression;
MethodCallExpression call = new MethodCallExpression(ve, setterInfo.name, newRightExpression);
call.setImplicitThis(false);
visitMethodCallExpression(call);
MethodNode directSetterCandidate = call.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
if (directSetterCandidate==null) {
// this may happen if there's a setter of type boolean/String/Class, and that we are using the property
// notation AND that the RHS is not a boolean/String/Class
for (MethodNode setter : setterInfo.setters) {
ClassNode type = getWrapper(setter.getParameters()[0].getOriginType());
if (Boolean_TYPE.equals(type) || STRING_TYPE.equals(type) || CLASS_Type.equals(type)) {
call = new MethodCallExpression(ve, setterInfo.name, new CastExpression(type, newRightExpression));
call.setImplicitThis(false);
visitMethodCallExpression(call);
directSetterCandidate = call.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
if (directSetterCandidate!=null) {
break;
}
}
}
}
if (directSetterCandidate != null) {
for (MethodNode setter : setterInfo.setters) {
if (setter == directSetterCandidate) {
leftExpression.putNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET, directSetterCandidate);
storeType(leftExpression, getType(newRightExpression));
break;
}
}
} else {
ClassNode firstSetterType = setterInfo.setters.iterator().next().getParameters()[0].getOriginType();
addAssignmentError(firstSetterType, getType(newRightExpression), expression);
return true;
}
return false;
}
private boolean isCompoundAssignment(Expression exp) {
if (!(exp instanceof BinaryExpression)) return false;
int type = ((BinaryExpression) exp).getOperation().getType();
return isAssignment(type) && type != ASSIGN;
}
private Token getOpWithoutEqual(Expression exp) {
if (!(exp instanceof BinaryExpression)) return null; // should never happen
Token op = ((BinaryExpression) exp).getOperation();
int typeWithoutEqual = TokenUtil.removeAssignment(op.getType());
return new Token(typeWithoutEqual, op.getText() /* will do */, op.getStartLine(), op.getStartColumn());
}
protected ClassNode getOriginalDeclarationType(Expression lhs) {
if (lhs instanceof VariableExpression) {
Variable var = findTargetVariable((VariableExpression) lhs);
if (var instanceof PropertyNode) {
// Do NOT trust the type of the property node!
return getType(lhs);
}
if (var instanceof DynamicVariable) return getType(lhs);
return var.getOriginType();
}
if (lhs instanceof FieldExpression) {
return ((FieldExpression) lhs).getField().getOriginType();
}
return getType(lhs);
}
protected void inferDiamondType(final ConstructorCallExpression cce, final ClassNode lType) {
// check if constructor call expression makes use of the diamond operator
ClassNode node = cce.getType();
if (node.isUsingGenerics() && node.getGenericsTypes() != null && node.getGenericsTypes().length == 0) {
ArgumentListExpression argumentListExpression = InvocationWriter.makeArgumentList(cce.getArguments());
if (argumentListExpression.getExpressions().isEmpty()) {
GenericsType[] genericsTypes = lType.getGenericsTypes();
if (genericsTypes == null) {
// case of def foo = new HashMap<>()
genericsTypes = node.redirect().getGenericsTypes();
}
GenericsType[] copy = new GenericsType[genericsTypes.length];
for (int i = 0; i < genericsTypes.length; i++) {
GenericsType genericsType = genericsTypes[i];
copy[i] = new GenericsType(
wrapTypeIfNecessary(genericsType.getType()),
genericsType.getUpperBounds(),
genericsType.getLowerBound()
);
}
node.setGenericsTypes(copy);
} else {
ClassNode type = getType(argumentListExpression.getExpression(0));
if (type.isUsingGenerics()) {
GenericsType[] genericsTypes = type.getGenericsTypes();
if (genericsTypes == null) {
genericsTypes = node.redirect().getGenericsTypes();
}
GenericsType[] copy = new GenericsType[genericsTypes.length];
for (int i = 0; i < genericsTypes.length; i++) {
GenericsType genericsType = genericsTypes[i];
copy[i] = new GenericsType(
wrapTypeIfNecessary(genericsType.getType()),
genericsType.getUpperBounds(),
genericsType.getLowerBound()
);
}
node.setGenericsTypes(copy);
}
}
// store inferred type on CCE
storeType(cce, node);
}
}
/**
* Stores information about types when [objectOfInstanceof instanceof typeExpression] is visited
*
* @param objectOfInstanceOf the expression which must be checked against instanceof
* @param typeExpression the expression which represents the target type
*/
protected void pushInstanceOfTypeInfo(final Expression objectOfInstanceOf, final Expression typeExpression) {
final Map<Object, List<ClassNode>> tempo = typeCheckingContext.temporaryIfBranchTypeInformation.peek();
Object key = extractTemporaryTypeInfoKey(objectOfInstanceOf);
List<ClassNode> potentialTypes = tempo.get(key);
if (potentialTypes == null) {
potentialTypes = new LinkedList<ClassNode>();
tempo.put(key, potentialTypes);
}
potentialTypes.add(typeExpression.getType());
}
private boolean typeCheckMultipleAssignmentAndContinue(Expression leftExpression, Expression rightExpression) {
// multiple assignment check
if (!(leftExpression instanceof TupleExpression)) return true;
if (!(rightExpression instanceof ListExpression)) {
addStaticTypeError("Multiple assignments without list expressions on the right hand side are unsupported in static type checking mode", rightExpression);
return false;
}
TupleExpression tuple = (TupleExpression) leftExpression;
ListExpression list = (ListExpression) rightExpression;
List<Expression> listExpressions = list.getExpressions();
List<Expression> tupleExpressions = tuple.getExpressions();
if (listExpressions.size() < tupleExpressions.size()) {
addStaticTypeError("Incorrect number of values. Expected:" + tupleExpressions.size() + " Was:" + listExpressions.size(), list);
return false;
}
for (int i = 0, tupleExpressionsSize = tupleExpressions.size(); i < tupleExpressionsSize; i++) {
Expression tupleExpression = tupleExpressions.get(i);
Expression listExpression = listExpressions.get(i);
ClassNode elemType = getType(listExpression);
ClassNode tupleType = getType(tupleExpression);
if (!isAssignableTo(elemType, tupleType)) {
addStaticTypeError("Cannot assign value of type " + elemType.toString(false) + " to variable of type " + tupleType.toString(false), rightExpression);
return false; // avoids too many errors
}
}
return true;
}
private static ClassNode adjustTypeForSpreading(ClassNode inferredRightExpressionType, Expression leftExpression) {
// imagine we have: list*.foo = 100
// then the assignment must be checked against [100], not 100
ClassNode wrappedRHS = inferredRightExpressionType;
if (leftExpression instanceof PropertyExpression && ((PropertyExpression) leftExpression).isSpreadSafe()) {
wrappedRHS = LIST_TYPE.getPlainNodeReference();
wrappedRHS.setGenericsTypes(new GenericsType[]{
new GenericsType(getWrapper(inferredRightExpressionType))
});
}
return wrappedRHS;
}
private boolean addedReadOnlyPropertyError(Expression expr) {
// if expr is of READONLY_PROPERTY_RETURN type, then it means we are on a missing property
if (expr.getNodeMetaData(StaticTypesMarker.READONLY_PROPERTY) == null) return false;
String name;
if (expr instanceof VariableExpression) {
name = ((VariableExpression) expr).getName();
} else {
name = ((PropertyExpression) expr).getPropertyAsString();
}
addStaticTypeError("Cannot set read-only property: " + name, expr);
return true;
}
private void addPrecisionErrors(ClassNode leftRedirect, ClassNode lhsType, ClassNode inferredrhsType, Expression rightExpression) {
if (isNumberType(leftRedirect) && isNumberType(inferredrhsType)) {
if (checkPossibleLooseOfPrecision(leftRedirect, inferredrhsType, rightExpression)) {
addStaticTypeError("Possible loss of precision from " + inferredrhsType + " to " + leftRedirect, rightExpression);
return;
}
}
// if left type is array, we should check the right component types
if (!lhsType.isArray()) return;
ClassNode leftComponentType = lhsType.getComponentType();
ClassNode rightRedirect = rightExpression.getType().redirect();
if (rightRedirect.isArray()) {
ClassNode rightComponentType = rightRedirect.getComponentType();
if (!checkCompatibleAssignmentTypes(leftComponentType, rightComponentType)) {
addStaticTypeError("Cannot assign value of type " + rightComponentType.toString(false) + " into array of type " + lhsType.toString(false), rightExpression);
}
} else if (rightExpression instanceof ListExpression) {
for (Expression element : ((ListExpression) rightExpression).getExpressions()) {
ClassNode rightComponentType = element.getType().redirect();
if (!checkCompatibleAssignmentTypes(leftComponentType, rightComponentType)
&& !(isNullConstant(element) && !isPrimitiveType(leftComponentType))) {
addStaticTypeError("Cannot assign value of type " + rightComponentType.toString(false) + " into array of type " + lhsType.toString(false), rightExpression);
}
}
}
}
private void addListAssignmentConstructorErrors(
ClassNode leftRedirect, ClassNode leftExpressionType,
ClassNode inferredRightExpressionType, Expression rightExpression,
Expression assignmentExpression)
{
// if left type is not a list but right type is a list, then we're in the case of a groovy
// constructor type : Dimension d = [100,200]
// In that case, more checks can be performed
if (rightExpression instanceof ListExpression && !implementsInterfaceOrIsSubclassOf(LIST_TYPE, leftRedirect)) {
ArgumentListExpression argList = new ArgumentListExpression(((ListExpression) rightExpression).getExpressions());
ClassNode[] args = getArgumentTypes(argList);
MethodNode methodNode = checkGroovyStyleConstructor(leftRedirect, args, assignmentExpression);
if (methodNode!=null) {
rightExpression.putNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET, methodNode);
}
} else if (!implementsInterfaceOrIsSubclassOf(inferredRightExpressionType, leftRedirect)
&& implementsInterfaceOrIsSubclassOf(inferredRightExpressionType, LIST_TYPE)
&& !isWildcardLeftHandSide(leftExpressionType)) {
if (!extension.handleIncompatibleAssignment(leftExpressionType, inferredRightExpressionType, assignmentExpression)) {
addAssignmentError(leftExpressionType, inferredRightExpressionType, assignmentExpression);
}
}
}
private void addMapAssignmentConstructorErrors(ClassNode leftRedirect, Expression leftExpression, Expression rightExpression) {
// if left type is not a list but right type is a map, then we're in the case of a groovy
// constructor type : A a = [x:2, y:3]
// In this case, more checks can be performed
if (!implementsInterfaceOrIsSubclassOf(leftRedirect, MAP_TYPE) && rightExpression instanceof MapExpression) {
if (!(leftExpression instanceof VariableExpression) || !((VariableExpression) leftExpression).isDynamicTyped()) {
ArgumentListExpression argList = new ArgumentListExpression(rightExpression);
ClassNode[] args = getArgumentTypes(argList);
checkGroovyStyleConstructor(leftRedirect, args, rightExpression);
// perform additional type checking on arguments
MapExpression mapExpression = (MapExpression) rightExpression;
checkGroovyConstructorMap(leftExpression, leftRedirect, mapExpression);
}
}
}
private void checkTypeGenerics(ClassNode leftExpressionType, ClassNode wrappedRHS, Expression rightExpression) {
// last, check generic type information to ensure that inferred types are compatible
if (!leftExpressionType.isUsingGenerics()) return;
// List<Foo> l = new List() is an example for incomplete generics type info
// we assume arity related errors are already handled here.
if (hasRHSIncompleteGenericTypeInfo(wrappedRHS)) return;
GenericsType gt = GenericsUtils.buildWildcardType(leftExpressionType);
if ( UNKNOWN_PARAMETER_TYPE.equals(wrappedRHS) ||
gt.isCompatibleWith(wrappedRHS) ||
isNullConstant(rightExpression)) return;
addStaticTypeError("Incompatible generic argument types. Cannot assign "
+ wrappedRHS.toString(false)
+ " to: " + leftExpressionType.toString(false), rightExpression);
}
private boolean hasGStringStringError(ClassNode leftExpressionType, ClassNode wrappedRHS, Expression rightExpression) {
if (isParameterizedWithString(leftExpressionType) && isParameterizedWithGStringOrGStringString(wrappedRHS)) {
addStaticTypeError("You are trying to use a GString in place of a String in a type which explicitly declares accepting String. " +
"Make sure to call toString() on all GString values.", rightExpression);
return true;
}
return false;
}