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apache / groovy / c341e2c44a64c25b8f8305dfe224cf795349c853 / . / src / main / java / org / codehaus / groovy / transform / stc / StaticTypeCheckingVisitor.java
blob: 9c1a3b92a7777d63ca819a8d02b94985728dcbdc [file] [log] [blame]
/*
* 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.Tuple2;
import groovy.transform.NamedParam;
import groovy.transform.NamedParams;
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.apache.groovy.util.SystemUtil;
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.CodeVisitorSupport;
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.GenericsType.GenericsTypeName;
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.AnnotationConstantExpression;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.ArrayExpression;
import org.codehaus.groovy.ast.expr.AttributeExpression;
import org.codehaus.groovy.ast.expr.BinaryExpression;
import org.codehaus.groovy.ast.expr.BitwiseNegationExpression;
import org.codehaus.groovy.ast.expr.CastExpression;
import org.codehaus.groovy.ast.expr.ClassExpression;
import org.codehaus.groovy.ast.expr.ClosureExpression;
import org.codehaus.groovy.ast.expr.ClosureListExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.ConstructorCallExpression;
import org.codehaus.groovy.ast.expr.DeclarationExpression;
import org.codehaus.groovy.ast.expr.ElvisOperatorExpression;
import org.codehaus.groovy.ast.expr.EmptyExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.FieldExpression;
import org.codehaus.groovy.ast.expr.LambdaExpression;
import org.codehaus.groovy.ast.expr.ListExpression;
import org.codehaus.groovy.ast.expr.MapEntryExpression;
import org.codehaus.groovy.ast.expr.MapExpression;
import org.codehaus.groovy.ast.expr.MethodCall;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.MethodPointerExpression;
import org.codehaus.groovy.ast.expr.MethodReferenceExpression;
import org.codehaus.groovy.ast.expr.NotExpression;
import org.codehaus.groovy.ast.expr.PostfixExpression;
import org.codehaus.groovy.ast.expr.PrefixExpression;
import org.codehaus.groovy.ast.expr.PropertyExpression;
import org.codehaus.groovy.ast.expr.RangeExpression;
import org.codehaus.groovy.ast.expr.SpreadExpression;
import org.codehaus.groovy.ast.expr.StaticMethodCallExpression;
import org.codehaus.groovy.ast.expr.TernaryExpression;
import org.codehaus.groovy.ast.expr.TupleExpression;
import org.codehaus.groovy.ast.expr.UnaryMinusExpression;
import org.codehaus.groovy.ast.expr.UnaryPlusExpression;
import org.codehaus.groovy.ast.expr.VariableExpression;
import org.codehaus.groovy.ast.stmt.BlockStatement;
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.ExpressionStatement;
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.GeneralUtils;
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.ResolveVisitor;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
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.objectweb.asm.Opcodes;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumMap;
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.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.StringJoiner;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static java.util.stream.Collectors.toMap;
import static org.apache.groovy.util.BeanUtils.capitalize;
import static org.apache.groovy.util.BeanUtils.decapitalize;
import static org.codehaus.groovy.ast.ClassHelper.AUTOCLOSEABLE_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.BigDecimal_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.BigInteger_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Byte_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.CLASS_Type;
import static org.codehaus.groovy.ast.ClassHelper.CLOSURE_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Character_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Double_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Float_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Integer_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Iterator_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.LIST_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Long_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.MAP_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Number_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.OBJECT_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.PATTERN_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.RANGE_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.SET_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.STREAM_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.STRING_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.Short_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.VOID_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.boolean_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.byte_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.char_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.double_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.dynamicType;
import static org.codehaus.groovy.ast.ClassHelper.findSAM;
import static org.codehaus.groovy.ast.ClassHelper.float_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.getNextSuperClass;
import static org.codehaus.groovy.ast.ClassHelper.getUnwrapper;
import static org.codehaus.groovy.ast.ClassHelper.getWrapper;
import static org.codehaus.groovy.ast.ClassHelper.int_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.isBigDecimalType;
import static org.codehaus.groovy.ast.ClassHelper.isBigIntegerType;
import static org.codehaus.groovy.ast.ClassHelper.isClassType;
import static org.codehaus.groovy.ast.ClassHelper.isDynamicTyped;
import static org.codehaus.groovy.ast.ClassHelper.isFunctionalInterface;
import static org.codehaus.groovy.ast.ClassHelper.isGStringType;
import static org.codehaus.groovy.ast.ClassHelper.isNumberType;
import static org.codehaus.groovy.ast.ClassHelper.isObjectType;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveBoolean;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveByte;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveChar;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveDouble;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveFloat;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveInt;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveLong;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveShort;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveType;
import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveVoid;
import static org.codehaus.groovy.ast.ClassHelper.isSAMType;
import static org.codehaus.groovy.ast.ClassHelper.isStringType;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperByte;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperCharacter;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperDouble;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperFloat;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperInteger;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperLong;
import static org.codehaus.groovy.ast.ClassHelper.isWrapperShort;
import static org.codehaus.groovy.ast.ClassHelper.long_TYPE;
import static org.codehaus.groovy.ast.ClassHelper.short_TYPE;
import static org.codehaus.groovy.ast.tools.ClosureUtils.getParametersSafe;
import static org.codehaus.groovy.ast.tools.ClosureUtils.getResolveStrategyName;
import static org.codehaus.groovy.ast.tools.ClosureUtils.hasImplicitParameter;
import static org.codehaus.groovy.ast.tools.GeneralUtils.args;
import static org.codehaus.groovy.ast.tools.GeneralUtils.binX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.callX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.castX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.constX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.elvisX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getGetterName;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getSetterName;
import static org.codehaus.groovy.ast.tools.GeneralUtils.isOrImplements;
import static org.codehaus.groovy.ast.tools.GeneralUtils.propX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.thisPropX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.varX;
import static org.codehaus.groovy.ast.tools.GenericsUtils.makeClassSafe0;
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.runtime.DefaultGroovyMethods.asBoolean;
import static org.codehaus.groovy.runtime.DefaultGroovyMethods.init;
import static org.codehaus.groovy.runtime.DefaultGroovyMethods.last;
import static org.codehaus.groovy.syntax.Types.ASSIGN;
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_NOT_IN;
import static org.codehaus.groovy.syntax.Types.COMPARE_NOT_INSTANCEOF;
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.ELVIS_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.INTDIV;
import static org.codehaus.groovy.syntax.Types.INTDIV_EQUAL;
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.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.ArrayList_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.Collection_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.LinkedHashMap_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.LinkedHashSet_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.Matcher_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.NUMBER_OPS;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.UNKNOWN_PARAMETER_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.allParametersAndArgumentsMatchWithDefaultParams;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.applyGenericsConnections;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.applyGenericsContext;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.boundUnboundedWildcards;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.checkCompatibleAssignmentTypes;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.checkPossibleLossOfPrecision;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.chooseBestMethod;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.evaluateExpression;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.extractGenericsConnections;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.extractGenericsParameterMapOfThis;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.filterMethodsByVisibility;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.findDGMMethodsByNameAndArguments;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.findDGMMethodsForClassNode;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.findSetters;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.findTargetVariable;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.fullyResolve;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.fullyResolveType;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.getCombinedBoundType;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.getCombinedGenericsType;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.getGenericsWithoutArray;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.getOperationName;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.implementsInterfaceOrIsSubclassOf;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isArrayOp;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isAssignableTo;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isAssignment;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isBeingCompiled;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isBitOperator;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isBoolIntrinsicOp;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isClassClassNodeWrappingConcreteType;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isCompareToBoolean;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isGStringOrGStringStringLUB;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isOperationInGroup;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isParameterizedWithGStringOrGStringString;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isParameterizedWithString;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isPowerOperator;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isShiftOperation;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isTraitSelf;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isUsingGenericsOrIsArrayUsingGenerics;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isVargs;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.isWildcardLeftHandSide;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.lastArgMatchesVarg;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.missesGenericsTypes;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.prettyPrintType;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.prettyPrintTypeName;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.resolveClassNodeGenerics;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.toMethodParametersString;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.typeCheckMethodArgumentWithGenerics;
import static org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.typeCheckMethodsWithGenerics;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.CLOSURE_ARGUMENTS;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.CONSTRUCTED_LAMBDA_EXPRESSION;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.DECLARATION_INFERRED_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.DELEGATION_METADATA;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.DIRECT_METHOD_CALL_TARGET;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.DYNAMIC_RESOLUTION;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.IMPLICIT_RECEIVER;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_RETURN_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_TYPE;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.PV_FIELDS_ACCESS;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.PV_FIELDS_MUTATION;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.PV_METHODS_ACCESS;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.READONLY_PROPERTY;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.SUPER_MOP_METHOD_REQUIRED;
import static org.codehaus.groovy.transform.stc.StaticTypesMarker.TYPE;
/**
* 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.
*/
public class StaticTypeCheckingVisitor extends ClassCodeVisitorSupport {
private static final boolean DEBUG_GENERATED_CODE = SystemUtil.getBooleanSafe("groovy.stc.debug");
private static final AtomicLong UNIQUE_LONG = new AtomicLong();
protected static final Object ERROR_COLLECTOR = ErrorCollector.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 CLOSUREPARAMS_CLASSNODE = ClassHelper.make(ClosureParams.class);
protected static final ClassNode NAMED_PARAMS_CLASSNODE = ClassHelper.make(NamedParams.class);
protected static final ClassNode NAMED_PARAM_CLASSNODE = ClassHelper.make(NamedParam.class);
@Deprecated protected static final ClassNode LINKEDHASHMAP_CLASSNODE = LinkedHashMap_TYPE;
protected static final ClassNode ENUMERATION_TYPE = ClassHelper.make(Enumeration.class);
protected static final ClassNode MAP_ENTRY_TYPE = ClassHelper.make(Map.Entry.class);
protected static final ClassNode ITERABLE_TYPE = ClassHelper.ITERABLE_TYPE;
private static List<ClassNode> TUPLE_TYPES = Arrays.stream(ClassHelper.TUPLE_CLASSES).map(ClassHelper::makeWithoutCaching).collect(Collectors.toList());
public static final MethodNode CLOSURE_CALL_NO_ARG = CLOSURE_TYPE.getDeclaredMethod("call", Parameter.EMPTY_ARRAY);
public static final MethodNode CLOSURE_CALL_ONE_ARG = CLOSURE_TYPE.getDeclaredMethod("call", new Parameter[]{new Parameter(OBJECT_TYPE, "arg")});
public static final MethodNode CLOSURE_CALL_VARGS = CLOSURE_TYPE.getDeclaredMethod("call", new Parameter[]{new Parameter(OBJECT_TYPE.makeArray(), "args")});
public static final Statement GENERATED_EMPTY_STATEMENT = EmptyStatement.INSTANCE;
protected final ReturnAdder.ReturnStatementListener returnListener = returnStatement -> {
if (returnStatement.isReturningNullOrVoid()) return;
ClassNode returnType = checkReturnType(returnStatement);
if (this.typeCheckingContext.getEnclosingClosure() != null) {
addClosureReturnType(returnType);
} else if (this.typeCheckingContext.getEnclosingMethod() == null) {
throw new GroovyBugError("Unexpected return statement at " + returnStatement.getLineNumber() + ":" + returnStatement.getColumnNumber() + " " + returnStatement.getText());
}
};
protected final ReturnAdder returnAdder = new ReturnAdder(returnListener);
protected FieldNode currentField;
protected PropertyNode currentProperty;
protected DefaultTypeCheckingExtension extension;
protected TypeCheckingContext typeCheckingContext;
public StaticTypeCheckingVisitor(final SourceUnit source, final ClassNode classNode) {
this.typeCheckingContext = new TypeCheckingContext(this);
this.typeCheckingContext.pushEnclosingClassNode(classNode);
this.typeCheckingContext.pushTemporaryTypeInfo();
this.typeCheckingContext.pushErrorCollector(
source.getErrorCollector());
this.typeCheckingContext.source = source;
this.extension = new DefaultTypeCheckingExtension(this);
this.extension.addHandler(new EnumTypeCheckingExtension(this));
this.extension.addHandler(new TraitTypeCheckingExtension(this));
}
@Override
protected SourceUnit getSourceUnit() {
return typeCheckingContext.getSource();
}
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(final TypeCheckingExtension extension) {
this.extension.addHandler(extension);
}
public void setCompilationUnit(final CompilationUnit compilationUnit) {
typeCheckingContext.setCompilationUnit(compilationUnit);
}
@Override
public void visitClass(final ClassNode node) {
if (shouldSkipClassNode(node)) return;
if (!extension.beforeVisitClass(node)) {
Object type = node.getNodeMetaData(INFERRED_TYPE);
if (type != null) {
// transformation has already been run on this class node
// so use a silent collector in order not to duplicate errors
typeCheckingContext.pushErrorCollector();
}
typeCheckingContext.pushEnclosingClassNode(node);
Set<MethodNode> oldSet = typeCheckingContext.alreadyVisitedMethods;
typeCheckingContext.alreadyVisitedMethods = new LinkedHashSet<>();
super.visitClass(node);
node.getInnerClasses().forEachRemaining(this::visitClass);
typeCheckingContext.alreadyVisitedMethods = oldSet;
typeCheckingContext.popEnclosingClassNode();
if (type != null) {
typeCheckingContext.popErrorCollector();
}
node.putNodeMetaData(INFERRED_TYPE, node);
node.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE);
// 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
node.getMethods().forEach(n -> n.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE));
node.getDeclaredConstructors().forEach(n -> n.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE));
}
extension.afterVisitClass(node);
}
/**
* Returns array of type checking annotations. Subclasses may override this
* method in order to provide additional types which must be looked up when
* checking if a method or a class node should be skipped.
* <p>
* The default implementation returns {@link TypeChecked}.
*/
protected ClassNode[] getTypeCheckingAnnotations() {
return TYPECHECKING_ANNOTATIONS;
}
protected boolean shouldSkipClassNode(final ClassNode node) {
return Boolean.TRUE.equals(node.getNodeMetaData(StaticTypeCheckingVisitor.class)) || isSkipMode(node);
}
protected boolean shouldSkipMethodNode(final MethodNode node) {
return Boolean.TRUE.equals(node.getNodeMetaData(StaticTypeCheckingVisitor.class)) || isSkipMode(node);
}
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());
}
return isSkippedInnerClass(node);
}
/**
* Tests if a node is an inner class node, and if it is, then checks if the enclosing method is skipped.
*
* @return true if the inner class node should be skipped
*/
protected boolean isSkippedInnerClass(final AnnotatedNode node) {
if (node instanceof ClassNode) {
ClassNode type = (ClassNode) node;
if (type.getOuterClass() != null) {
MethodNode enclosingMethod = type.getEnclosingMethod();
if (enclosingMethod != null && isSkipMode(enclosingMethod)) {
return true;
}
}
}
return false;
}
@Override
public void visitClassExpression(final ClassExpression expression) {
super.visitClassExpression(expression);
ClassNode cn = expression.getNodeMetaData(INFERRED_TYPE);
if (cn == null) {
storeType(expression, getType(expression));
}
}
private static ClassNode getOutermost(ClassNode cn) {
while (cn.getOuterClass() != null) {
cn = cn.getOuterClass();
}
return cn;
}
private static void addPrivateFieldOrMethodAccess(final Expression source, final ClassNode cn, final StaticTypesMarker key, final ASTNode accessedMember) {
cn.getNodeMetaData(key, x -> new LinkedHashSet<>()).add(accessedMember);
source.putNodeMetaData(key, accessedMember);
}
/**
* Checks for private field access from inner or outer class.
*/
private void checkOrMarkPrivateAccess(final Expression source, final FieldNode fn, final boolean lhsOfAssignment) {
if (fn == null || !fn.isPrivate()) return;
ClassNode declaringClass = fn.getDeclaringClass();
ClassNode enclosingClass = typeCheckingContext.getEnclosingClassNode();
if (declaringClass == enclosingClass && typeCheckingContext.getEnclosingClosure() == null) return;
if (declaringClass == enclosingClass || getOutermost(declaringClass) == getOutermost(enclosingClass)) {
StaticTypesMarker accessKind = lhsOfAssignment ? PV_FIELDS_MUTATION : PV_FIELDS_ACCESS;
addPrivateFieldOrMethodAccess(source, declaringClass, accessKind, fn);
}
}
/**
* Checks for private method call from inner or outer class.
*/
private void checkOrMarkPrivateAccess(final Expression source, final MethodNode mn) {
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, 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, PV_METHODS_ACCESS, mn);
break;
}
}
}
}
}
@Override
public void visitVariableExpression(final VariableExpression vexp) {
super.visitVariableExpression(vexp);
if (storeTypeForSuper(vexp)) return;
if (storeTypeForThis(vexp)) return;
final String name = vexp.getName();
final Variable accessedVariable = vexp.getAccessedVariable();
final TypeCheckingContext.EnclosingClosure enclosingClosure = typeCheckingContext.getEnclosingClosure();
if (accessedVariable instanceof DynamicVariable) {
// a dynamic variable is either a closure property, a class member referenced from a closure, or an undeclared variable
if (enclosingClosure != null) {
switch (name) {
case "delegate":
DelegationMetadata dm = getDelegationMetadata(enclosingClosure.getClosureExpression());
if (dm != null) {
storeType(vexp, dm.getType());
return;
}
// falls through
case "owner":
if (typeCheckingContext.getEnclosingClosureStack().size() > 1) {
storeType(vexp, CLOSURE_TYPE);
return;
}
// falls through
case "thisObject":
storeType(vexp, typeCheckingContext.getEnclosingClassNode());
return;
case "parameterTypes":
storeType(vexp, CLASS_Type.makeArray());
return;
case "maximumNumberOfParameters":
case "resolveStrategy":
case "directive":
storeType(vexp, int_TYPE);
return;
}
}
if (tryVariableExpressionAsProperty(vexp, name)) return;
if (!extension.handleUnresolvedVariableExpression(vexp)) {
addStaticTypeError("The variable [" + name + "] is undeclared.", vexp);
}
} else if (accessedVariable instanceof FieldNode) {
if (enclosingClosure != null) {
tryVariableExpressionAsProperty(vexp, name);
} else {
checkOrMarkPrivateAccess(vexp, (FieldNode) accessedVariable, typeCheckingContext.isTargetOfEnclosingAssignment(vexp));
// GROOVY-9454
ClassNode inferredType = getInferredTypeFromTempInfo(vexp, null);
if (inferredType != null && !isObjectType(inferredType)) {
vexp.putNodeMetaData(INFERRED_TYPE, inferredType);
} else {
storeType(vexp, getType(vexp));
}
}
} else if (accessedVariable 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, name)) {
BinaryExpression enclosingBinaryExpression = typeCheckingContext.getEnclosingBinaryExpression();
if (enclosingBinaryExpression != null) {
Expression leftExpression = enclosingBinaryExpression.getLeftExpression();
SetterInfo setterInfo = removeSetterInfo(leftExpression);
if (setterInfo != null) {
Expression rightExpression = enclosingBinaryExpression.getRightExpression();
ensureValidSetter(vexp, leftExpression, rightExpression, setterInfo);
}
}
}
} else if (accessedVariable != null) {
VariableExpression localVariable;
if (accessedVariable instanceof Parameter) {
Parameter prm = (Parameter) accessedVariable;
localVariable = new ParameterVariableExpression(prm);
} else {
localVariable = (VariableExpression) accessedVariable;
}
ClassNode inferredType = localVariable.getNodeMetaData(INFERRED_TYPE);
inferredType = getInferredTypeFromTempInfo(localVariable, inferredType);
if (inferredType != null && !isObjectType(inferredType) && !inferredType.equals(accessedVariable.getType())) {
vexp.putNodeMetaData(INFERRED_TYPE, inferredType);
}
}
}
private boolean storeTypeForSuper(final VariableExpression vexp) {
if (vexp == VariableExpression.SUPER_EXPRESSION) return true;
if (!vexp.isSuperExpression()) return false;
storeType(vexp, makeSuper());
return true;
}
private boolean storeTypeForThis(final VariableExpression vexp) {
if (vexp == VariableExpression.THIS_EXPRESSION) return true;
if (!vexp.isThisExpression()) return false;
// GROOVY-6904, GROOVY-9422: non-static inner class constructor call sets type
storeType(vexp, !isObjectType(vexp.getType()) ? vexp.getType() : makeThis());
return true;
}
private boolean tryVariableExpressionAsProperty(final VariableExpression vexp, final String dynName) {
PropertyExpression pexp = thisPropX(true, dynName);
if (existsProperty(pexp, !typeCheckingContext.isTargetOfEnclosingAssignment(vexp))) {
vexp.copyNodeMetaData(pexp.getObjectExpression());
for (Object key : new Object[]{IMPLICIT_RECEIVER, READONLY_PROPERTY, PV_FIELDS_ACCESS, PV_FIELDS_MUTATION, DECLARATION_INFERRED_TYPE, DIRECT_METHOD_CALL_TARGET}) {
Object val = pexp.getNodeMetaData(key);
if (val != null) vexp.putNodeMetaData(key, val);
}
vexp.removeNodeMetaData(INFERRED_TYPE);
ClassNode type = pexp.getNodeMetaData(INFERRED_TYPE);
storeType(vexp, Optional.ofNullable(type).orElseGet(pexp::getType));
String receiver = vexp.getNodeMetaData(IMPLICIT_RECEIVER);
Boolean dynamic = pexp.getNodeMetaData(DYNAMIC_RESOLUTION);
// GROOVY-7701, GROOVY-7996: correct false assumption made by VariableScopeVisitor
if (((receiver != null && !receiver.endsWith("owner")) || Boolean.TRUE.equals(dynamic))
&& !(vexp.getAccessedVariable() instanceof DynamicVariable)) {
vexp.setAccessedVariable(new DynamicVariable(dynName, false));
}
return true;
}
return false;
}
@Override
public void visitPropertyExpression(final PropertyExpression expression) {
if (existsProperty(expression, !typeCheckingContext.isTargetOfEnclosingAssignment(expression))) return;
if (!extension.handleUnresolvedProperty(expression)) {
Expression objectExpression = expression.getObjectExpression();
addStaticTypeError("No such property: " + expression.getPropertyAsString() + " for class: " +
prettyPrintTypeName(findCurrentInstanceOfClass(objectExpression, getType(objectExpression))), expression);
}
}
@Override
public void visitAttributeExpression(final AttributeExpression expression) {
if (existsProperty(expression, true)) return;
if (!extension.handleUnresolvedAttribute(expression)) {
Expression objectExpression = expression.getObjectExpression();
addStaticTypeError("No such attribute: " + expression.getPropertyAsString() + " for class: " +
prettyPrintTypeName(findCurrentInstanceOfClass(objectExpression, getType(objectExpression))), expression);
}
}
@Override
public void visitRangeExpression(final RangeExpression expression) {
super.visitRangeExpression(expression);
ClassNode fromType = getWrapper(getType(expression.getFrom()));
ClassNode toType = getWrapper(getType(expression.getTo()));
if (isWrapperInteger(fromType) && isWrapperInteger(toType)) {
storeType(expression, ClassHelper.make(IntRange.class));
} else {
ClassNode rangeType = RANGE_TYPE.getPlainNodeReference();
rangeType.setGenericsTypes(new GenericsType[]{new GenericsType(lowestUpperBound(fromType, toType))});
storeType(expression, rangeType);
}
}
@Override
public void visitNotExpression(final NotExpression expression) {
// GROOVY-9455: !(x instanceof T) shouldn't propagate T as inferred type
typeCheckingContext.pushTemporaryTypeInfo();
super.visitNotExpression(expression);
typeCheckingContext.popTemporaryTypeInfo();
}
@Override
public void visitBinaryExpression(final BinaryExpression expression) {
BinaryExpression enclosingBinaryExpression = typeCheckingContext.getEnclosingBinaryExpression();
typeCheckingContext.pushEnclosingBinaryExpression(expression);
try {
int op = expression.getOperation().getType();
Expression leftExpression = expression.getLeftExpression();
Expression rightExpression = expression.getRightExpression();
leftExpression.visit(this);
SetterInfo setterInfo = removeSetterInfo(leftExpression);
ClassNode lType = null;
if (setterInfo != null) {
if (ensureValidSetter(expression, leftExpression, rightExpression, setterInfo)) {
return;
}
lType = getType(leftExpression);
} else {
if (op != EQUAL && op != ELVIS_EQUAL) {
lType = getType(leftExpression);
} else {
lType = getOriginalDeclarationType(leftExpression);
applyTargetType(lType, rightExpression);
}
rightExpression.visit(this);
}
ClassNode rType = isNullConstant(rightExpression) && !isPrimitiveType(lType)
? UNKNOWN_PARAMETER_TYPE // null to primitive type is handled elsewhere
: getInferredTypeFromTempInfo(rightExpression, getType(rightExpression));
ClassNode resultType;
if (op == KEYWORD_IN || op == COMPARE_NOT_IN) {
// for the "in" or "!in" operator, the receiver and the arguments are reversed
BinaryExpression reverseExpression = binX(rightExpression, expression.getOperation(), leftExpression);
resultType = getResultType(rType, op, lType, reverseExpression);
if (resultType == null) resultType = boolean_TYPE; // GROOVY-10239
storeTargetMethod(expression, reverseExpression.getNodeMetaData(DIRECT_METHOD_CALL_TARGET));
} else {
resultType = getResultType(lType, op, rType, expression);
if (op == ELVIS_EQUAL) {
// TODO: Should this transform and visit be done before left and right are visited above?
Expression fullExpression = new ElvisOperatorExpression(leftExpression, rightExpression);
fullExpression.setSourcePosition(expression);
fullExpression.visit(this);
resultType = getType(fullExpression);
}
}
if (resultType == null) {
resultType = lType;
}
if (isArrayOp(op)) {
if (leftExpression instanceof VariableExpression) {//GROOVY-6782
if (leftExpression.getNodeMetaData(INFERRED_TYPE) == null) {
leftExpression.removeNodeMetaData(INFERRED_RETURN_TYPE);
storeType(leftExpression, lType);
}
}
if (!lType.isArray()
&& enclosingBinaryExpression != null
&& enclosingBinaryExpression.getLeftExpression() == expression
&& isAssignment(enclosingBinaryExpression.getOperation().getType())) {
// left hand side of a subscript assignment: map['foo'] = ...
Expression enclosingExpressionRHS = enclosingBinaryExpression.getRightExpression();
if (!(enclosingExpressionRHS instanceof ClosureExpression)) {
enclosingExpressionRHS.visit(this);
}
ClassNode[] arguments = {rType, getType(enclosingExpressionRHS)};
List<MethodNode> nodes = findMethod(lType.redirect(), "putAt", arguments);
if (nodes.size() == 1) {
typeCheckMethodsWithGenericsOrFail(lType, arguments, nodes.get(0), enclosingExpressionRHS);
} else if (nodes.isEmpty()) {
addNoMatchingMethodError(lType, "putAt", arguments, enclosingBinaryExpression);
}
}
}
boolean isEmptyDeclaration = (expression instanceof DeclarationExpression
&& (rightExpression instanceof EmptyExpression || rType == UNKNOWN_PARAMETER_TYPE));
if (!isEmptyDeclaration && isAssignment(op)) {
if (rightExpression instanceof ConstructorCallExpression)
inferDiamondType((ConstructorCallExpression) rightExpression, lType);
// handle unchecked assignment: List<Type> list = []
resultType = adjustForTargetType(resultType, lType);
ClassNode originType = getOriginalDeclarationType(leftExpression);
typeCheckAssignment(expression, leftExpression, originType, rightExpression, resultType);
// check for implicit conversion like "String a = 123", "int[] b = [1,2,3]", "List c = [].stream()", etc.
if (!implementsInterfaceOrIsSubclassOf(wrapTypeIfNecessary(resultType), wrapTypeIfNecessary(originType))) {
resultType = originType;
} else if (isPrimitiveType(originType) && resultType.equals(getWrapper(originType))) {
resultType = originType; // retain primitive semantics
} else {
// GROOVY-7549: RHS type may not be accessible to enclosing class
int modifiers = resultType.getModifiers();
ClassNode enclosingType = typeCheckingContext.getEnclosingClassNode();
if (!Modifier.isPublic(modifiers) && !enclosingType.equals(resultType)
&& !getOutermost(enclosingType).equals(getOutermost(resultType))
&& (Modifier.isPrivate(modifiers) || !Objects.equals(enclosingType.getPackageName(), resultType.getPackageName()))) {
resultType = originType; // TODO: Find accesible type in hierarchy of resultType?
} else if (GenericsUtils.hasUnresolvedGenerics(resultType)) { // GROOVY-9033, GROOVY-10089, et al.
Map<GenericsTypeName, GenericsType> enclosing = extractGenericsParameterMapOfThis(typeCheckingContext);
resultType = fullyResolveType(resultType, Optional.ofNullable(enclosing).orElseGet(Collections::emptyMap));
}
}
// track conditional assignment
if (leftExpression instanceof VariableExpression
&& typeCheckingContext.ifElseForWhileAssignmentTracker != null) {
Variable accessedVariable = ((VariableExpression) leftExpression).getAccessedVariable();
if (accessedVariable instanceof Parameter) {
accessedVariable = new ParameterVariableExpression((Parameter) accessedVariable);
}
if (accessedVariable instanceof VariableExpression) {
recordAssignment((VariableExpression) accessedVariable, resultType);
}
}
storeType(leftExpression, resultType);
// propagate closure parameter type information
if (leftExpression instanceof VariableExpression) {
if (rightExpression instanceof ClosureExpression) {
leftExpression.putNodeMetaData(CLOSURE_ARGUMENTS, ((ClosureExpression) rightExpression).getParameters());
} else if (rightExpression instanceof VariableExpression
&& ((VariableExpression) rightExpression).getAccessedVariable() instanceof Expression
&& ((Expression) ((VariableExpression) rightExpression).getAccessedVariable()).getNodeMetaData(CLOSURE_ARGUMENTS) != null) {
Variable targetVariable = findTargetVariable((VariableExpression) leftExpression);
if (targetVariable instanceof ASTNode) {
((ASTNode) targetVariable).putNodeMetaData(CLOSURE_ARGUMENTS, ((Expression) ((VariableExpression) rightExpression).getAccessedVariable()).getNodeMetaData(CLOSURE_ARGUMENTS));
}
}
}
} else if (op == KEYWORD_INSTANCEOF /*|| op == COMPARE_NOT_INSTANCEOF*/) {
pushInstanceOfTypeInfo(leftExpression, rightExpression);
}
if (!isEmptyDeclaration) {
storeType(expression, resultType);
}
validateResourceInARM(expression, resultType);
// GROOVY-5874: if left expression is a closure shared variable, a second pass should be done
if (leftExpression instanceof VariableExpression && ((VariableExpression) leftExpression).isClosureSharedVariable()) {
typeCheckingContext.secondPassExpressions.add(new SecondPassExpression<>(expression));
}
} finally {
typeCheckingContext.popEnclosingBinaryExpression();
}
}
private void validateResourceInARM(final BinaryExpression expression, final ClassNode lType) {
if (expression instanceof DeclarationExpression
&& TryCatchStatement.isResource(expression)
&& !isOrImplements(lType, AUTOCLOSEABLE_TYPE)) {
addError("Resource[" + lType.getName() + "] in ARM should be of type AutoCloseable", expression);
}
}
private void applyTargetType(final ClassNode target, final Expression source) {
if (isFunctionalInterface(target)) {
if (source instanceof ClosureExpression) {
inferParameterAndReturnTypesOfClosureOnRHS(target, (ClosureExpression) source);
} else if (source instanceof MethodReferenceExpression) {
LambdaExpression lambdaExpression = constructLambdaExpressionForMethodReference(target);
inferParameterAndReturnTypesOfClosureOnRHS(target, lambdaExpression);
source.putNodeMetaData(CONSTRUCTED_LAMBDA_EXPRESSION, lambdaExpression);
source.putNodeMetaData(CLOSURE_ARGUMENTS, Arrays.stream(lambdaExpression.getParameters()).map(Parameter::getType).toArray(ClassNode[]::new));
}
} else if (isClosureWithType(target)) {
if (source instanceof ClosureExpression) {
GenericsType returnType = target.getGenericsTypes()[0];
storeInferredReturnType(source, getCombinedBoundType(returnType));
}
}
}
private void inferParameterAndReturnTypesOfClosureOnRHS(final ClassNode lhsType, final ClosureExpression rhsExpression) {
Tuple2<ClassNode[], ClassNode> typeInfo = GenericsUtils.parameterizeSAM(lhsType);
Parameter[] closureParameters = getParametersSafe(rhsExpression);
ClassNode[] samParameterTypes = typeInfo.getV1();
int n = closureParameters.length, m = samParameterTypes.length;
if (n == m || (1 == m && hasImplicitParameter(rhsExpression))) {
for (int i = 0; i < n; i += 1) {
Parameter parameter = closureParameters[i];
if (parameter.isDynamicTyped()) {
parameter.setType(samParameterTypes[i]);
parameter.setOriginType(samParameterTypes[i]);
} else {
checkParamType(parameter, samParameterTypes[i], i == n-1, rhsExpression instanceof LambdaExpression);
}
}
} else {
addStaticTypeError("Wrong number of parameters for method target " + toMethodParametersString(findSAM(lhsType).getName(), samParameterTypes), rhsExpression);
}
storeInferredReturnType(rhsExpression, typeInfo.getV2());
}
private void checkParamType(final Parameter source, final ClassNode target, final boolean isLast, final boolean lambda) {
if (/*lambda ? !source.getOriginType().equals(target) :*/!typeCheckMethodArgumentWithGenerics(source.getOriginType(), target, isLast))
addStaticTypeError("Expected type " + prettyPrintType(target) + " for " + (lambda ? "lambda" : "closure") + " parameter: " + source.getName(), source);
}
/**
* 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 {@code false} if valid setter found or {@code true} if type checking error created
*/
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 receiver = varX("%", setterInfo.receiverType);
// for "x op= y" expression, find type as if it was "x = x op y"
Expression valueExpression = rightExpression;
if (isCompoundAssignment(expression)) {
Token op = ((BinaryExpression) expression).getOperation();
if (op.getType() == ELVIS_EQUAL) { // GROOVY-10419: "x ?= y"
valueExpression = elvisX(leftExpression, rightExpression);
} else {
op = Token.newSymbol(TokenUtil.removeAssignment(op.getType()), op.getStartLine(), op.getStartColumn());
valueExpression = binX(leftExpression, op, rightExpression);
}
}
Function<Expression, MethodNode> setterCall = right -> {
typeCheckingContext.pushEnclosingBinaryExpression(null); // GROOVY-10628: LHS re-purposed
try {
MethodCallExpression call = new MethodCallExpression(receiver, setterInfo.name, right);
call.setImplicitThis(false);
visitMethodCallExpression(call);
return call.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
} finally {
typeCheckingContext.popEnclosingBinaryExpression();
}
};
Function<MethodNode, ClassNode> setterType = setter -> {
ClassNode type = setter.getParameters()[0].getOriginType();
if (!setter.isStatic() && !(setter instanceof ExtensionMethodNode) && GenericsUtils.hasUnresolvedGenerics(type)) {
type = applyGenericsContext(extractPlaceHolders(setterInfo.receiverType, setter.getDeclaringClass()), type);
}
return type;
};
MethodNode methodTarget = setterCall.apply(valueExpression);
if (methodTarget == null && !isCompoundAssignment(expression)) {
// if no direct match, try implicit conversion
for (MethodNode setter : setterInfo.setters) {
ClassNode lType = setterType.apply(setter);
ClassNode rType = getDeclaredOrInferredType(valueExpression);
if (lType.isArray() && valueExpression instanceof ListExpression) {
rType = inferLoopElementType(rType).makeArray(); // GROOVY-7506
}
if (checkCompatibleAssignmentTypes(lType, rType, valueExpression, false)) {
methodTarget = setterCall.apply(castX(lType, valueExpression));
if (methodTarget != null) {
break;
}
}
}
}
if (methodTarget != null) {
for (MethodNode setter : setterInfo.setters) {
if (setter == methodTarget) {
leftExpression.putNodeMetaData(DIRECT_METHOD_CALL_TARGET, methodTarget);
leftExpression.removeNodeMetaData(INFERRED_TYPE); // clear assumption
storeType(leftExpression, setterType.apply(methodTarget));
break;
}
}
return false;
} else {
ClassNode firstSetterType = setterType.apply(setterInfo.setters.get(0));
addAssignmentError(firstSetterType, getType(valueExpression), expression);
return true;
}
}
private static boolean isClosureWithType(final ClassNode type) {
return CLOSURE_TYPE.equals(type) && Optional.ofNullable(type.getGenericsTypes()).filter(gts -> gts != null && gts.length == 1).isPresent();
}
private static boolean isCompoundAssignment(final Expression exp) {
if (exp instanceof BinaryExpression) {
Token op = ((BinaryExpression) exp).getOperation();
return isAssignment(op.getType()) && op.getType() != EQUAL;
}
return false;
}
protected ClassNode getOriginalDeclarationType(final Expression lhs) {
Variable var = null;
if (lhs instanceof FieldExpression) {
var = ((FieldExpression) lhs).getField();
} else if (lhs instanceof VariableExpression) {
var = findTargetVariable((VariableExpression) lhs);
}
return var != null && !(var instanceof DynamicVariable) ? var.getOriginType() : getType(lhs);
}
protected void inferDiamondType(final ConstructorCallExpression cce, final ClassNode lType) {
ClassNode cceType = cce.getType(), inferredType = lType;
// check if constructor call expression makes use of the diamond operator
if (cceType.getGenericsTypes() != null && cceType.getGenericsTypes().length == 0) {
ArgumentListExpression argumentList = InvocationWriter.makeArgumentList(cce.getArguments());
ConstructorNode constructor = cce.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
if (!argumentList.getExpressions().isEmpty() && constructor != null) {
ClassNode type = GenericsUtils.parameterizeType(cceType, cceType);
type = inferReturnTypeGenerics(type, constructor, argumentList);
if (lType.getGenericsTypes() != null // GROOVY-10367: nothing to inspect
&& (type.toString(false).indexOf('#') > 0 // GROOVY-9983, GROOVY-10291, GROOVY-10368: unresolved generic
// GROOVY-6232, GROOVY-9956: if cce not assignment compatible, process target as additional type witness
|| checkCompatibleAssignmentTypes(lType, type, cce) && !GenericsUtils.buildWildcardType(lType).isCompatibleWith(type))) {
// allow covariance of each type parameter, but maintain semantics for nested generics
ClassNode pType = GenericsUtils.parameterizeType(lType, type);
GenericsType[] lhs = pType.getGenericsTypes(), rhs = type.getGenericsTypes();
if (lhs == null || rhs == null || lhs.length != rhs.length) throw new GroovyBugError(
"Parameterization failed: " + prettyPrintType(pType) + " ~ " + prettyPrintType(type));
if (IntStream.range(0, lhs.length).allMatch(i ->
GenericsUtils.buildWildcardType(getCombinedBoundType(lhs[i])).isCompatibleWith(rhs[i].getType()))) {
type = pType; // lType proved to be a viable type witness
}
}
inferredType = type;
}
if (inferredType.isGenericsPlaceHolder()) // GROOVY-10344: "T t = new C<>()"
inferredType = getCombinedBoundType(inferredType.getGenericsTypes()[0]);
adjustGenerics(inferredType, cceType);
storeType(cce, cceType);
}
}
private void adjustGenerics(final ClassNode source, final ClassNode target) {
GenericsType[] genericsTypes = source.getGenericsTypes();
if (genericsTypes == null) { // Map foo = new HashMap<>()
genericsTypes = target.redirect().getGenericsTypes().clone();
for (int i = 0, n = genericsTypes.length; i < n; i += 1) {
GenericsType gt = genericsTypes[i];
// GROOVY-10055: handle diamond or raw
ClassNode cn = gt.getUpperBounds() != null
? gt.getUpperBounds()[0] : gt.getType().redirect();
genericsTypes[i] = cn.getPlainNodeReference().asGenericsType();
}
} else {
genericsTypes = genericsTypes.clone();
for (int i = 0, n = genericsTypes.length; i < n; i += 1) {
GenericsType gt = genericsTypes[i];
genericsTypes[i] = new GenericsType(gt.getType(),
gt.getUpperBounds(), gt.getLowerBound());
genericsTypes[i].setWildcard(gt.isWildcard()); // GROOVY-10310
}
}
target.setGenericsTypes(genericsTypes);
}
/**
* 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) {
List<ClassNode> potentialTypes = typeCheckingContext.temporaryIfBranchTypeInformation.peek()
.computeIfAbsent(extractTemporaryTypeInfoKey(objectOfInstanceOf), key -> new LinkedList<>());
potentialTypes.add(typeExpression.getType());
}
private boolean typeCheckMultipleAssignmentAndContinue(final Expression leftExpression, Expression rightExpression) {
if (rightExpression instanceof VariableExpression || rightExpression instanceof PropertyExpression || rightExpression instanceof MethodCall) {
ClassNode inferredType = Optional.ofNullable(getType(rightExpression)).orElseGet(rightExpression::getType);
GenericsType[] genericsTypes = inferredType.getGenericsTypes();
ListExpression listExpression = new ListExpression();
listExpression.setSourcePosition(rightExpression);
// convert Tuple[1-16] bearing expressions to mock list for checking
for (int n = TUPLE_TYPES.indexOf(inferredType), i = 0; i < n; i += 1) {
ClassNode type = (genericsTypes != null ? genericsTypes[i].getType() : OBJECT_TYPE);
listExpression.addExpression(varX("v" + (i + 1), type));
}
if (!listExpression.getExpressions().isEmpty()) {
rightExpression = listExpression;
}
}
if (!(rightExpression instanceof ListExpression)) {
addStaticTypeError("Multiple assignments without list or tuple on the right-hand side are unsupported in static type checking mode", rightExpression);
return false;
}
TupleExpression tuple = (TupleExpression) leftExpression;
ListExpression values = (ListExpression) rightExpression;
List<Expression> tupleExpressions = tuple.getExpressions();
List<Expression> valueExpressions = values.getExpressions();
if (tupleExpressions.size() > valueExpressions.size()) {
addStaticTypeError("Incorrect number of values. Expected:" + tupleExpressions.size() + " Was:" + valueExpressions.size(), values);
return false;
}
for (int i = 0, n = tupleExpressions.size(); i < n; i += 1) {
ClassNode valueType = getType(valueExpressions.get(i));
ClassNode targetType = getType(tupleExpressions.get(i));
if (!isAssignableTo(valueType, targetType)) {
addStaticTypeError("Cannot assign value of type " + prettyPrintType(valueType) + " to variable of type " + prettyPrintType(targetType), rightExpression);
return false;
}
storeType(tupleExpressions.get(i), valueType);
}
return true;
}
private ClassNode adjustTypeForSpreading(final ClassNode rightExpressionType, final Expression leftExpression) {
// given "list*.foo = 100" or "map*.value = 100", then the assignment must be checked against [100], not 100
if (leftExpression instanceof PropertyExpression && ((PropertyExpression) leftExpression).isSpreadSafe()) {
return extension.buildListType(rightExpressionType);
}
return rightExpressionType;
}
private boolean addedReadOnlyPropertyError(final Expression expr) {
// if expr is of READONLY_PROPERTY_RETURN type, then it means we are on a missing property
if (expr.getNodeMetaData(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(final ClassNode leftRedirect, final ClassNode lhsType, final ClassNode rhsType, final Expression rightExpression) {
if (isNumberType(leftRedirect)) {
if (isNumberType(rhsType) && checkPossibleLossOfPrecision(leftRedirect, rhsType, rightExpression)) {
addStaticTypeError("Possible loss of precision from " + prettyPrintType(rhsType) + " to " + prettyPrintType(lhsType), rightExpression);
}
return;
}
if (!leftRedirect.isArray()) return;
// left type is an array, check the right component types
if (rightExpression instanceof ListExpression) {
ClassNode leftComponentType = leftRedirect.getComponentType();
for (Expression expression : ((ListExpression) rightExpression).getExpressions()) {
ClassNode rightComponentType = getType(expression);
if (!checkCompatibleAssignmentTypes(leftComponentType, rightComponentType) && !(isNullConstant(expression) && !isPrimitiveType(leftComponentType))) {
addStaticTypeError("Cannot assign value of type " + prettyPrintType(rightComponentType) + " into array of type " + prettyPrintType(lhsType), rightExpression);
}
}
} else if (rhsType.redirect().isArray()) {
ClassNode leftComponentType = leftRedirect.getComponentType();
ClassNode rightComponentType = rhsType.redirect().getComponentType();
if (!checkCompatibleAssignmentTypes(leftComponentType, rightComponentType)) {
addStaticTypeError("Cannot assign value of type " + prettyPrintType(rightComponentType) + " into array of type " + prettyPrintType(lhsType), rightExpression);
}
}
}
private void addListAssignmentConstructorErrors(final ClassNode leftRedirect, final ClassNode leftExpressionType, final ClassNode inferredRightExpressionType, final Expression rightExpression, final Expression assignmentExpression) {
if (isWildcardLeftHandSide(leftRedirect) && !isClassType(leftRedirect)) return; // GROOVY-6802, GROOVY-6803
// 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 (!implementsInterfaceOrIsSubclassOf(LIST_TYPE, leftRedirect)
&& (!leftRedirect.isAbstract() || leftRedirect.isArray())
&& !ArrayList_TYPE.isDerivedFrom(leftRedirect) && !LinkedHashSet_TYPE.isDerivedFrom(leftRedirect)) {
ClassNode[] types = getArgumentTypes(args(((ListExpression) rightExpression).getExpressions()));
MethodNode methodNode = checkGroovyStyleConstructor(leftRedirect, types, assignmentExpression);
if (methodNode != null) {
rightExpression.putNodeMetaData(DIRECT_METHOD_CALL_TARGET, methodNode);
}
} else if (implementsInterfaceOrIsSubclassOf(inferredRightExpressionType, LIST_TYPE)
&& !implementsInterfaceOrIsSubclassOf(inferredRightExpressionType, leftRedirect)) {
if (!extension.handleIncompatibleAssignment(leftExpressionType, inferredRightExpressionType, assignmentExpression)) {
addAssignmentError(leftExpressionType, inferredRightExpressionType, assignmentExpression);
}
}
}
private void addMapAssignmentConstructorErrors(final ClassNode leftRedirect, final Expression leftExpression, final Expression rightExpression) {
if ((leftExpression instanceof VariableExpression && ((VariableExpression) leftExpression).isDynamicTyped())
|| (isWildcardLeftHandSide(leftRedirect) && !isClassType(leftRedirect)) // GROOVY-6802, GROOVY-6803
|| implementsInterfaceOrIsSubclassOf(leftRedirect, MAP_TYPE)) {
return;
}
// groovy constructor shorthand: A a = [x:2, y:3]
ClassNode[] argTypes = getArgumentTypes(args(rightExpression));
checkGroovyStyleConstructor(leftRedirect, argTypes, rightExpression);
// perform additional type checking on arguments
MapExpression mapExpression = (MapExpression) rightExpression;
checkGroovyConstructorMap(leftExpression, leftRedirect, mapExpression);
}
private void checkTypeGenerics(final ClassNode leftExpressionType, final ClassNode wrappedRHS, final Expression rightExpression) {
if (leftExpressionType.isUsingGenerics()
&& !isNullConstant(rightExpression)
&& !(rightExpression instanceof ClosureExpression) // GROOVY-10277
&& !UNKNOWN_PARAMETER_TYPE.equals(wrappedRHS) && !missesGenericsTypes(wrappedRHS)
&& !GenericsUtils.buildWildcardType(leftExpressionType).isCompatibleWith(wrappedRHS))
addStaticTypeError("Incompatible generic argument types. Cannot assign " + prettyPrintType(wrappedRHS) + " to: " + prettyPrintType(leftExpressionType), rightExpression);
}
private boolean hasGStringStringError(final ClassNode leftExpressionType, final ClassNode wrappedRHS, final 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;
}
private static boolean isConstructorAbbreviation(final ClassNode leftType, final Expression rightExpression) {
if (rightExpression instanceof ListExpression) {
return !(ArrayList_TYPE.isDerivedFrom(leftType) || ArrayList_TYPE.implementsInterface(leftType)
|| LinkedHashSet_TYPE.isDerivedFrom(leftType) || LinkedHashSet_TYPE.implementsInterface(leftType));
}
if (rightExpression instanceof MapExpression) {
return !(LinkedHashMap_TYPE.isDerivedFrom(leftType) || LinkedHashMap_TYPE.implementsInterface(leftType));
}
return false;
}
protected void typeCheckAssignment(final BinaryExpression assignmentExpression, final Expression leftExpression, final ClassNode leftExpressionType, final Expression rightExpression, final ClassNode rightExpressionType) {
if (leftExpression instanceof TupleExpression) {
if (!typeCheckMultipleAssignmentAndContinue(leftExpression, rightExpression)) return;
}
// TODO: need errors for write-only too!
if (addedReadOnlyPropertyError(leftExpression)) return;
ClassNode rTypeWrapped = adjustTypeForSpreading(rightExpressionType, leftExpression);
if (!checkCompatibleAssignmentTypes(leftExpressionType, rTypeWrapped, rightExpression)) {
if (!extension.handleIncompatibleAssignment(leftExpressionType, rightExpressionType, assignmentExpression)) {
addAssignmentError(leftExpressionType, rightExpressionType, rightExpression);
}
} else {
ClassNode lTypeRedirect = leftExpressionType.redirect();
addPrecisionErrors(lTypeRedirect, leftExpressionType, rightExpressionType, rightExpression);
if (rightExpression instanceof ListExpression) {
addListAssignmentConstructorErrors(lTypeRedirect, leftExpressionType, rightExpressionType, rightExpression, assignmentExpression);
} else if (rightExpression instanceof MapExpression) {
addMapAssignmentConstructorErrors(lTypeRedirect, leftExpression, rightExpression);
}
if (!hasGStringStringError(leftExpressionType, rTypeWrapped, rightExpression)
&& !isConstructorAbbreviation(leftExpressionType, rightExpression)) {
checkTypeGenerics(leftExpressionType, rTypeWrapped, rightExpression);
}
}
}
protected void checkGroovyConstructorMap(final Expression receiver, final ClassNode receiverType, final MapExpression mapExpression) {
// workaround for map-style checks putting setter info on wrong AST nodes
typeCheckingContext.pushEnclosingBinaryExpression(null);
for (MapEntryExpression entryExpression : mapExpression.getMapEntryExpressions()) {
Expression keyExpression = entryExpression.getKeyExpression();
if (!(keyExpression instanceof ConstantExpression)) {
addStaticTypeError("Dynamic keys in map-style constructors are unsupported in static type checking", keyExpression);
} else {
String pName = keyExpression.getText();
AtomicReference<ClassNode> pType = new AtomicReference<>();
if (!existsProperty(propX(varX("_", receiverType), pName), false, new PropertyLookupVisitor(pType))) {
addStaticTypeError("No such property: " + pName + " for class: " + prettyPrintTypeName(receiverType), receiver);
} else {
ClassNode targetType = Optional.ofNullable(receiverType.getSetterMethod(getSetterName(pName), false))
.map(setter -> setter.getParameters()[0].getType()).orElseGet(pType::get);
Expression valueExpression = entryExpression.getValueExpression();
ClassNode valueType = getType(valueExpression);
ClassNode resultType = getResultType(targetType, ASSIGN, valueType,
assignX(keyExpression, valueExpression, entryExpression));
if (!checkCompatibleAssignmentTypes(targetType, resultType, valueExpression)
&& !extension.handleIncompatibleAssignment(targetType, valueType, entryExpression)) {
addAssignmentError(targetType, valueType, entryExpression);
}
}
}
}
typeCheckingContext.popEnclosingBinaryExpression();
}
@Deprecated
protected static boolean hasRHSIncompleteGenericTypeInfo(final ClassNode inferredRightExpressionType) {
boolean replaceType = false;
GenericsType[] genericsTypes = inferredRightExpressionType.getGenericsTypes();
if (genericsTypes != null) {
for (GenericsType genericsType : genericsTypes) {
if (genericsType.isPlaceholder()) {
replaceType = true;
break;
}
}
}
return replaceType;
}
/**
* Checks that a constructor style expression is valid regarding the number
* of arguments and the argument types.
*
* @param node the class node for which we will try to find a matching constructor
* @param arguments the constructor arguments
* @deprecated use {@link #checkGroovyStyleConstructor(org.codehaus.groovy.ast.ClassNode, org.codehaus.groovy.ast.ClassNode[], org.codehaus.groovy.ast.ASTNode)} )}
*/
@Deprecated
protected void checkGroovyStyleConstructor(final ClassNode node, final ClassNode[] arguments) {
checkGroovyStyleConstructor(node, arguments, typeCheckingContext.getEnclosingClassNode());
}
/**
* Checks that a constructor style expression is valid regarding the number
* of arguments and the argument types.
*
* @param node the class node for which we will try to find a matching constructor
* @param arguments the constructor arguments
*/
protected MethodNode checkGroovyStyleConstructor(final ClassNode node, final ClassNode[] arguments, final ASTNode source) {
if (isObjectType(node) || isDynamicTyped(node)) {
// in that case, we are facing a list constructor assigned to a def or object
return null;
}
List<ConstructorNode> constructors = node.getDeclaredConstructors();
if (constructors.isEmpty() && arguments.length == 0) {
return null;
}
List<MethodNode> constructorList = findMethod(node, "<init>", arguments);
if (constructorList.isEmpty()) {
if (isBeingCompiled(node) && arguments.length == 1 && LinkedHashMap_TYPE.equals(arguments[0])) {
// there will be a default hash map constructor added later
ConstructorNode cn = new ConstructorNode(Opcodes.ACC_PUBLIC, new Parameter[]{new Parameter(LinkedHashMap_TYPE, "args")}, ClassNode.EMPTY_ARRAY, EmptyStatement.INSTANCE);
return cn;
} else {
addStaticTypeError("No matching constructor found: " + prettyPrintTypeName(node) + toMethodParametersString("", arguments), source);
return null;
}
} else if (constructorList.size() > 1) {
addStaticTypeError("Ambiguous constructor call " + prettyPrintTypeName(node) + toMethodParametersString("", arguments), source);
return null;
}
return constructorList.get(0);
}
/**
* When instanceof checks are found in the code, we store temporary type
* information data in the {@link TypeCheckingContext#temporaryIfBranchTypeInformation}
* table. This method computes the key which must be used to store this type
* info.
*
* @param expression the expression for which to compute the key
* @return a key to be used for {@link TypeCheckingContext#temporaryIfBranchTypeInformation}
*/
protected Object extractTemporaryTypeInfoKey(final Expression expression) {
return expression instanceof VariableExpression ? findTargetVariable((VariableExpression) expression) : expression.getText();
}
/**
* A helper method which determines which receiver class should be used in error messages when a field or attribute
* is not found. The returned type class depends on whether we have temporary type information available (due to
* instanceof checks) and whether there is a single candidate in that case.
*
* @param expr the expression for which an unknown field has been found
* @param type the type of the expression (used as fallback type)
* @return if temporary information is available and there's only one type, returns the temporary type class
* otherwise falls back to the provided type class.
*/
protected ClassNode findCurrentInstanceOfClass(final Expression expr, final ClassNode type) {
if (!typeCheckingContext.temporaryIfBranchTypeInformation.isEmpty()) {
List<ClassNode> nodes = getTemporaryTypesForExpression(expr);
if (nodes != null && nodes.size() == 1) return nodes.get(0);
}
return type;
}
protected boolean existsProperty(final PropertyExpression pexp, final boolean checkForReadOnly) {
return existsProperty(pexp, checkForReadOnly, null);
}
/**
* Checks whether a property exists on the receiver, or on any of the possible receiver classes (found in the
* temporary type information table)
*
* @param pexp a property expression
* @param readMode if true, look for property read, else for property set
* @param visitor if not null, when the property node is found, visit it with the provided visitor
* @return true if the property is defined in any of the possible receiver classes
*/
protected boolean existsProperty(final PropertyExpression pexp, final boolean readMode, final ClassCodeVisitorSupport visitor) {
super.visitPropertyExpression(pexp);
String propertyName = pexp.getPropertyAsString();
if (propertyName == null) return false;
Expression objectExpression = pexp.getObjectExpression();
ClassNode objectExpressionType = getType(objectExpression);
if (objectExpression instanceof ConstructorCallExpression) {
ClassNode rawType = objectExpressionType.getPlainNodeReference();
inferDiamondType((ConstructorCallExpression) objectExpression, rawType);
}
// enclosing excludes classes that skip STC
Set<ClassNode> enclosingTypes = new LinkedHashSet<>();
enclosingTypes.add(typeCheckingContext.getEnclosingClassNode());
enclosingTypes.addAll(enclosingTypes.iterator().next().getOuterClasses());
boolean staticOnlyAccess = isClassClassNodeWrappingConcreteType(objectExpressionType);
if (staticOnlyAccess && "this".equals(propertyName)) {
// handle "Outer.this" for any level of nesting
ClassNode outer = objectExpressionType.getGenericsTypes()[0].getType();
ClassNode found = null;
for (ClassNode enclosingType : enclosingTypes) {
if (!enclosingType.isStaticClass() && outer.equals(enclosingType.getOuterClass())) {
found = enclosingType;
break;
}
}
if (found != null) {
storeType(pexp, outer);
return true;
}
}
boolean foundGetterOrSetter = false;
String capName = capitalize(propertyName);
Set<ClassNode> handledNodes = new HashSet<>();
List<Receiver<String>> receivers = new ArrayList<>();
addReceivers(receivers, makeOwnerList(objectExpression), pexp.isImplicitThis());
for (Receiver<String> receiver : receivers) {
ClassNode receiverType = receiver.getType();
if (receiverType.isArray() && "length".equals(propertyName)) {
pexp.putNodeMetaData(READONLY_PROPERTY, Boolean.TRUE);
storeType(pexp, int_TYPE);
if (visitor != null) {
FieldNode length = new FieldNode("length", Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, int_TYPE, receiverType, null);
length.setDeclaringClass(receiverType);
visitor.visitField(length);
}
return true;
}
LinkedList<ClassNode> queue = new LinkedList<>();
queue.add(receiverType);
if (isPrimitiveType(receiverType)) {
queue.add(getWrapper(receiverType));
}
while (!queue.isEmpty()) {
ClassNode current = queue.remove();
if (!handledNodes.add(current)) continue;
FieldNode field = current.getDeclaredField(propertyName);
if (field == null) {
if (current.getSuperClass() != null)
queue.addFirst(current.getSuperClass());
Collections.addAll(queue, current.getInterfaces());
}
boolean staticOnly = (receiver.getData() == null ? staticOnlyAccess : false);
// in case of a lookup on java.lang.Class, look for instance methods on Class
// as well; in case of static property access Class<Type> and Type are listed
if (isClassClassNodeWrappingConcreteType(current)) staticOnly = false;
field = allowStaticAccessToMember(field, staticOnly);
// skip property/accessor checks for "x.@field"
if (pexp instanceof AttributeExpression) {
if (field != null && storeField(field, pexp, receiverType, visitor, receiver.getData(), !readMode)) {
return true;
}
continue;
}
// skip property/accessor checks for "field", "this.field", "this.with { field }", etc. in declaring class of field
if (field != null && enclosingTypes.contains(current)) {
if (storeField(field, pexp, receiverType, visitor, receiver.getData(), !readMode)) {
return true;
}
}
MethodNode getter = findGetter(current, "is" + capName, pexp.isImplicitThis());
getter = allowStaticAccessToMember(getter, staticOnly);
if (getter == null) getter = findGetter(current, getGetterName(propertyName), pexp.isImplicitThis());
getter = allowStaticAccessToMember(getter, staticOnly);
List<MethodNode> setters = findSetters(current, getSetterName(propertyName), /*enforce void:*/false);
setters = allowStaticAccessToMember(setters, staticOnly);
// need to visit even if we only look for setters for compatibility
if (visitor != null && getter != null) visitor.visitMethod(getter);
PropertyNode property = current.getProperty(propertyName);
property = allowStaticAccessToMember(property, staticOnly);
// prefer explicit getter or setter over property if receiver is not 'this'
if (property == null || !enclosingTypes.contains(receiverType)) {
if (readMode) {
if (getter != null && hasAccessToMember(enclosingTypes.iterator().next(), getter.getDeclaringClass(), getter.getModifiers())) {
ClassNode returnType = inferReturnTypeGenerics(current, getter, ArgumentListExpression.EMPTY_ARGUMENTS);
storeInferredTypeForPropertyExpression(pexp, returnType);
storeTargetMethod(pexp, getter);
String delegationData = receiver.getData();
if (delegationData != null) {
pexp.putNodeMetaData(IMPLICIT_RECEIVER, delegationData);
}
return true;
}
} else {
if (!setters.isEmpty()) {
if (visitor != null) {
if (field != null) {
visitor.visitField(field);
} else {
for (MethodNode setter : setters) {
// visiting setter will not infer the property type since return type is void, so visit a dummy field instead
FieldNode virtual = new FieldNode(propertyName, 0, setter.getParameters()[0].getOriginType(), current, null);
virtual.setDeclaringClass(setter.getDeclaringClass());
visitor.visitField(virtual);
}
}
}
SetterInfo info = new SetterInfo(current, getSetterName(propertyName), setters);
BinaryExpression enclosingBinaryExpression = typeCheckingContext.getEnclosingBinaryExpression();
if (enclosingBinaryExpression != null) {
putSetterInfo(enclosingBinaryExpression.getLeftExpression(), info);
}
String delegationData = receiver.getData();
if (delegationData != null) {
pexp.putNodeMetaData(IMPLICIT_RECEIVER, delegationData);
}
pexp.removeNodeMetaData(READONLY_PROPERTY);
return true;
} else if (getter != null && field == null) {
pexp.putNodeMetaData(READONLY_PROPERTY, Boolean.TRUE); // GROOVY-9127
}
}
}
if (property != null && storeProperty(property, pexp, receiverType, visitor, receiver.getData(), !readMode)) return true;
if (field != null && storeField(field, pexp, receiverType, visitor, receiver.getData(), !readMode)) return true;
foundGetterOrSetter = (foundGetterOrSetter || !setters.isEmpty() || getter != null);
}
// GROOVY-5568: the property may be defined by DGM
for (ClassNode dgmReceiver : isPrimitiveType(receiverType) ? new ClassNode[]{receiverType, getWrapper(receiverType)} : new ClassNode[]{receiverType}) {
List<MethodNode> methods = findDGMMethodsByNameAndArguments(getSourceUnit().getClassLoader(), dgmReceiver, "get" + capName, ClassNode.EMPTY_ARRAY);
for (MethodNode method : findDGMMethodsByNameAndArguments(getSourceUnit().getClassLoader(), dgmReceiver, "is" + capName, ClassNode.EMPTY_ARRAY)) {
if (isPrimitiveBoolean(method.getReturnType())) methods.add(method);
}
if (isUsingGenericsOrIsArrayUsingGenerics(dgmReceiver)) {
methods.removeIf(method -> // GROOVY-10075: "List<Integer>" vs "List<String>"
!typeCheckMethodsWithGenerics(dgmReceiver, ClassNode.EMPTY_ARRAY, method)
);
}
if (!methods.isEmpty()) {
List<MethodNode> bestMethods = chooseBestMethod(dgmReceiver, methods, ClassNode.EMPTY_ARRAY);
if (bestMethods.size() == 1) {
MethodNode getter = bestMethods.get(0);
if (visitor != null) {
visitor.visitMethod(getter);
}
ClassNode returnType = inferReturnTypeGenerics(dgmReceiver, getter, ArgumentListExpression.EMPTY_ARGUMENTS);
storeInferredTypeForPropertyExpression(pexp, returnType);
if (readMode) storeTargetMethod(pexp, getter);
return true;
}
}
}
// GROOVY-7996: check if receiver implements get(String)/set(String,Object) or propertyMissing(String) or $static_propertyMissing(String)?
if (!receiverType.isArray() && !isPrimitiveType(getUnwrapper(receiverType))
&& pexp.isImplicitThis() && typeCheckingContext.getEnclosingClosure() != null) {
MethodNode mopMethod;
if (readMode) {
mopMethod = receiverType.getMethod("get", new Parameter[]{new Parameter(STRING_TYPE, "name")});
} else {
mopMethod = receiverType.getMethod("set", new Parameter[]{new Parameter(STRING_TYPE, "name"), new Parameter(OBJECT_TYPE, "value")});
}
if (mopMethod == null) mopMethod = receiverType.getMethod("propertyMissing", new Parameter[]{new Parameter(STRING_TYPE, "propertyName")});
if (mopMethod != null && !mopMethod.isStatic() && !mopMethod.isSynthetic()) {
pexp.putNodeMetaData(DYNAMIC_RESOLUTION, Boolean.TRUE);
pexp.removeNodeMetaData(DECLARATION_INFERRED_TYPE);
pexp.removeNodeMetaData(INFERRED_TYPE);
visitor.visitMethod(mopMethod);
return true;
}
}
}
for (Receiver<String> receiver : receivers) {
ClassNode receiverType = receiver.getType();
ClassNode propertyType = getTypeForMapPropertyExpression(receiverType, pexp);
if (propertyType == null)
propertyType = getTypeForListPropertyExpression(receiverType, pexp);
if (propertyType == null)
propertyType = getTypeForSpreadExpression(receiverType, pexp);
if (propertyType == null)
continue;
if (visitor != null) {
// TODO: type inference on maps and lists, if possible
PropertyNode node = new PropertyNode(propertyName, Opcodes.ACC_PUBLIC, propertyType, receiver.getType(), null, null, null);
node.setDeclaringClass(receiver.getType());
visitor.visitProperty(node);
}
storeType(pexp, propertyType);
String delegationData = receiver.getData();
if (delegationData != null) pexp.putNodeMetaData(IMPLICIT_RECEIVER, delegationData);
return true;
}
return foundGetterOrSetter;
}
private static boolean hasAccessToMember(final ClassNode accessor, final ClassNode receiver, final int modifiers) {
if (Modifier.isPublic(modifiers)
|| accessor.equals(receiver)
|| accessor.getOuterClasses().contains(receiver)) {
return true;
}
if (!Modifier.isPrivate(modifiers) && Objects.equals(accessor.getPackageName(), receiver.getPackageName())) {
return true;
}
return Modifier.isProtected(modifiers) && accessor.isDerivedFrom(receiver);
}
private MethodNode findGetter(final ClassNode current, String name, final boolean searchOuterClasses) {
MethodNode getterMethod = current.getGetterMethod(name);
if (getterMethod == null && searchOuterClasses && current.getOuterClass() != null) {
return findGetter(current.getOuterClass(), name, true);
}
return getterMethod;
}
private ClassNode getTypeForMultiValueExpression(final ClassNode compositeType, final Expression prop) {
GenericsType[] gts = compositeType.getGenericsTypes();
ClassNode itemType = (gts != null && gts.length == 1 ? getCombinedBoundType(gts[0]) : OBJECT_TYPE);
AtomicReference<ClassNode> propertyType = new AtomicReference<>();
if (existsProperty(propX(varX("{}", itemType), prop), true, new PropertyLookupVisitor(propertyType))) {
return extension.buildListType(propertyType.get());
}
return null;
}
private ClassNode getTypeForSpreadExpression(final ClassNode testClass, final PropertyExpression pexp) {
if (pexp.isSpreadSafe()) {
MethodCallExpression mce = callX(varX("_", testClass), "iterator");
mce.setImplicitThis(false);
mce.visit(this);
ClassNode iteratorType = getType(mce);
if (isOrImplements(iteratorType, Iterator_TYPE)) {
return getTypeForMultiValueExpression(iteratorType, pexp.getProperty());
}
}
return null;
}
private ClassNode getTypeForListPropertyExpression(final ClassNode testClass, final PropertyExpression pexp) {
if (isOrImplements(testClass, LIST_TYPE)) {
ClassNode listType = testClass.equals(LIST_TYPE) ? testClass
: GenericsUtils.parameterizeType(testClass, LIST_TYPE);
return getTypeForMultiValueExpression(listType, pexp.getProperty());
}
return null;
}
private ClassNode getTypeForMapPropertyExpression(final ClassNode testClass, final PropertyExpression pexp) {
if (isOrImplements(testClass, MAP_TYPE)) {
ClassNode mapType = testClass.equals(MAP_TYPE) ? testClass
: GenericsUtils.parameterizeType(testClass, MAP_TYPE);
GenericsType[] gts = mapType.getGenericsTypes();//<K,V> params
if (gts == null || gts.length != 2) gts = new GenericsType[] {
OBJECT_TYPE.asGenericsType(), OBJECT_TYPE.asGenericsType()
};
if (!pexp.isSpreadSafe()) {
return getCombinedBoundType(gts[1]);
} else {
// map*.property syntax acts on Entry
switch (pexp.getPropertyAsString()) {
case "key":
pexp.putNodeMetaData(READONLY_PROPERTY,Boolean.TRUE); // GROOVY-10326
return makeClassSafe0(LIST_TYPE, gts[0]);
case "value":
GenericsType v = gts[1];
if (!v.isWildcard()
&& !Modifier.isFinal(v.getType().getModifiers())
&& typeCheckingContext.isTargetOfEnclosingAssignment(pexp)) {
v = GenericsUtils.buildWildcardType(v.getType()); // GROOVY-10325
}
return makeClassSafe0(LIST_TYPE, v);
default:
addStaticTypeError("Spread operator on map only allows one of [key,value]", pexp);
}
}
}
return null;
}
/**
* Filters search result to prevent access to instance members from a static
* context.
* <p>
* Return null if the given member is not static, but we want to access in a
* static way (staticOnly=true). If we want to access in a non-static way we
* always return the member, since then access to static members and
* non-static members is allowed.
*
* @return {@code member} or null
*/
private <T> T allowStaticAccessToMember(final T member, final boolean staticOnly) {
if (member == null || !staticOnly) return member;
if (member instanceof List) {
@SuppressWarnings("unchecked")
T list = (T) ((List<MethodNode>) member).stream()
.map(m -> allowStaticAccessToMember(m, true))
.filter(Objects::nonNull).collect(Collectors.toList());
return list;
}
boolean isStatic;
if (member instanceof FieldNode) {
isStatic = ((FieldNode) member).isStatic();
} else if (member instanceof MethodNode) {
isStatic = ((MethodNode) member).isStatic();
} else {
isStatic = ((PropertyNode) member).isStatic();
}
return (isStatic ? member : null);
}
private boolean storeField(final FieldNode field, final PropertyExpression expressionToStoreOn, final ClassNode receiver, final ClassCodeVisitorSupport visitor, final String delegationData, final boolean lhsOfAssignment) {
if (visitor != null) visitor.visitField(field);
checkOrMarkPrivateAccess(expressionToStoreOn, field, lhsOfAssignment);
boolean accessible = hasAccessToMember(isSuperExpression(expressionToStoreOn.getObjectExpression()) ? typeCheckingContext.getEnclosingClassNode() : receiver, field.getDeclaringClass(), field.getModifiers());
if (expressionToStoreOn instanceof AttributeExpression) { // TODO: expand to include PropertyExpression
if (!accessible) {
addStaticTypeError("The field " + field.getDeclaringClass().getNameWithoutPackage() + "." + field.getName() + " is not accessible", expressionToStoreOn.getProperty());
}
}
storeWithResolve(field.getOriginType(), receiver, field.getDeclaringClass(), field.isStatic(), expressionToStoreOn);
if (delegationData != null) {
expressionToStoreOn.putNodeMetaData(IMPLICIT_RECEIVER, delegationData);
}
if (field.isFinal()) {
MethodNode enclosing = typeCheckingContext.getEnclosingMethod();
if (enclosing == null || !enclosing.getName().endsWith("init>"))
expressionToStoreOn.putNodeMetaData(READONLY_PROPERTY, Boolean.TRUE); // GROOVY-5450
} else if (accessible) {
expressionToStoreOn.removeNodeMetaData(READONLY_PROPERTY);
}
return true;
}
private boolean storeProperty(final PropertyNode property, final PropertyExpression expression, final ClassNode receiver, final ClassCodeVisitorSupport visitor, final String delegationData, final boolean lhsOfAssignment) {
if (visitor != null) visitor.visitProperty(property);
ClassNode propertyType = property.getOriginType();
storeWithResolve(propertyType, receiver, property.getDeclaringClass(), property.isStatic(), expression);
if (delegationData != null) {
expression.putNodeMetaData(IMPLICIT_RECEIVER, delegationData);
}
if (Modifier.isFinal(property.getModifiers())) {
expression.putNodeMetaData(READONLY_PROPERTY, Boolean.TRUE);
if (!lhsOfAssignment) {
MethodNode implicitGetter = new MethodNode(property.getGetterNameOrDefault(), Opcodes.ACC_PUBLIC, propertyType, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null);
implicitGetter.setDeclaringClass(property.getDeclaringClass());
extension.onMethodSelection(expression, implicitGetter);
}
} else {
expression.removeNodeMetaData(READONLY_PROPERTY);
if (lhsOfAssignment) {
MethodNode implicitSetter = new MethodNode(property.getSetterNameOrDefault(), Opcodes.ACC_PUBLIC, VOID_TYPE, new Parameter[] {new Parameter(propertyType, "value")}, ClassNode.EMPTY_ARRAY, null);
implicitSetter.setDeclaringClass(property.getDeclaringClass());
extension.onMethodSelection(expression, implicitSetter);
}
}
return true;
}
private void storeWithResolve(ClassNode type, final ClassNode receiver, final ClassNode declaringClass, final boolean isStatic, final Expression expressionToStoreOn) {
if (!isStatic && GenericsUtils.hasUnresolvedGenerics(type)) {
type = resolveGenericsWithContext(extractPlaceHolders(receiver, declaringClass), type);
}
if (expressionToStoreOn instanceof PropertyExpression) {
storeInferredTypeForPropertyExpression((PropertyExpression) expressionToStoreOn, type);
} else {
storeType(expressionToStoreOn, type);
}
}
private ClassNode resolveGenericsWithContext(final Map<GenericsTypeName, GenericsType> resolvedPlaceholders, final ClassNode currentType) {
Map<GenericsTypeName, GenericsType> placeholdersFromContext = extractGenericsParameterMapOfThis(typeCheckingContext);
return resolveClassNodeGenerics(resolvedPlaceholders, placeholdersFromContext, currentType);
}
private void storeInferredTypeForPropertyExpression(final PropertyExpression pexp, final ClassNode type) {
if (pexp.isSpreadSafe()) {
storeType(pexp, extension.buildListType(type));
} else {
storeType(pexp, type);
}
}
@Override
public void visitProperty(final PropertyNode node) {
boolean osc = typeCheckingContext.isInStaticContext;
try {
typeCheckingContext.isInStaticContext = node.isInStaticContext();
currentProperty = node;
visitAnnotations(node);
visitClassCodeContainer(node.getGetterBlock());
visitClassCodeContainer(node.getSetterBlock());
} finally {
currentProperty = null;
typeCheckingContext.isInStaticContext = osc;
}
}
@Override
public void visitField(final FieldNode node) {
boolean osc = typeCheckingContext.isInStaticContext;
try {
typeCheckingContext.isInStaticContext = node.isInStaticContext();
currentField = node;
visitAnnotations(node);
visitInitialExpression(node.getInitialExpression(), new FieldExpression(node), node);
} finally {
currentField = null;
typeCheckingContext.isInStaticContext = osc;
}
}
private void visitInitialExpression(final Expression value, final Expression target, final ASTNode position) {
if (value != null) {
ClassNode lType = target.getType();
applyTargetType(lType, value); // GROOVY-9977
typeCheckingContext.pushEnclosingBinaryExpression(assignX(target, value, position));
value.visit(this);
ClassNode rType = getType(value);
if (value instanceof ConstructorCallExpression) {
inferDiamondType((ConstructorCallExpression) value, lType);
}
BinaryExpression dummy = typeCheckingContext.popEnclosingBinaryExpression();
typeCheckAssignment(dummy, target, lType, value, getResultType(lType, ASSIGN, rType, dummy));
}
}
@Override
public void visitForLoop(final ForStatement forLoop) {
// collect every variable expression used in the loop body
Map<VariableExpression, ClassNode> varOrigType = new HashMap<>();
forLoop.getLoopBlock().visit(new VariableExpressionTypeMemoizer(varOrigType));
// visit body
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
Expression collectionExpression = forLoop.getCollectionExpression();
if (collectionExpression instanceof ClosureListExpression) {
// for (int i=0; i<...; i++) style loop
super.visitForLoop(forLoop);
} else {
visitStatement(forLoop);
collectionExpression.visit(this);
ClassNode collectionType = getType(collectionExpression);
ClassNode forLoopVariableType = forLoop.getVariableType();
ClassNode componentType;
if (isWrapperCharacter(getWrapper(forLoopVariableType)) && isStringType(collectionType)) {
// we allow auto-coercion here
componentType = forLoopVariableType;
} else {
componentType = inferLoopElementType(collectionType);
}
if (getUnwrapper(componentType) == forLoopVariableType) {
// prefer primitive type over boxed type
componentType = forLoopVariableType;
}
if (!checkCompatibleAssignmentTypes(forLoopVariableType, componentType)) {
addStaticTypeError("Cannot loop with element of type " + prettyPrintType(forLoopVariableType) + " with collection of type " + prettyPrintType(collectionType), forLoop);
}
if (!isDynamicTyped(forLoopVariableType)) {
// user has specified a type, prefer it over the inferred type
componentType = forLoopVariableType;
}
typeCheckingContext.controlStructureVariables.put(forLoop.getVariable(), componentType);
try {
forLoop.getLoopBlock().visit(this);
} finally {
typeCheckingContext.controlStructureVariables.remove(forLoop.getVariable());
}
}
if (isSecondPassNeededForControlStructure(varOrigType, oldTracker)) {
visitForLoop(forLoop);
}
}
/**
* Returns the inferred loop element type given a loop collection type. Used,
* for example, to infer the element type of a {@code for (e in list)} loop.
*
* @param collectionType the type of the collection
* @return the inferred component type
* @see #inferComponentType
*/
public static ClassNode inferLoopElementType(final ClassNode collectionType) {
ClassNode componentType = collectionType.getComponentType();
if (componentType == null) {
if (isOrImplements(collectionType, ITERABLE_TYPE)) {
ClassNode col = GenericsUtils.parameterizeType(collectionType, ITERABLE_TYPE);
componentType = getCombinedBoundType(col.getGenericsTypes()[0]);
} else if (isOrImplements(collectionType, MAP_TYPE)) { // GROOVY-6240
ClassNode col = GenericsUtils.parameterizeType(collectionType, MAP_TYPE);
componentType = makeClassSafe0(MAP_ENTRY_TYPE, col.getGenericsTypes());
} else if (isOrImplements(collectionType, STREAM_TYPE)) { // GROOVY-10476
ClassNode col = GenericsUtils.parameterizeType(collectionType, STREAM_TYPE);
componentType = getCombinedBoundType(col.getGenericsTypes()[0]);
} else if (isOrImplements(collectionType, ENUMERATION_TYPE)) { // GROOVY-6123
ClassNode col = GenericsUtils.parameterizeType(collectionType, ENUMERATION_TYPE);
componentType = getCombinedBoundType(col.getGenericsTypes()[0]);
} else if (isOrImplements(collectionType, Iterator_TYPE)) { // GROOVY-10712
ClassNode col = GenericsUtils.parameterizeType(collectionType, Iterator_TYPE);
componentType = getCombinedBoundType(col.getGenericsTypes()[0]);
} else if (isStringType(collectionType)) {
componentType = STRING_TYPE;
} else {
componentType = OBJECT_TYPE;
}
}
return componentType;
}
protected boolean isSecondPassNeededForControlStructure(final Map<VariableExpression, ClassNode> varOrigType, final Map<VariableExpression, List<ClassNode>> oldTracker) {
for (Map.Entry<VariableExpression, ClassNode> entry : popAssignmentTracking(oldTracker).entrySet()) {
Variable key = findTargetVariable(entry.getKey());
if (key instanceof VariableExpression && varOrigType.containsKey(key)) {
ClassNode origType = varOrigType.get(key);
ClassNode newType = entry.getValue();
if (!newType.equals(origType)) {
return true;
}
}
}
return false;
}
@Override
public void visitWhileLoop(final WhileStatement loop) {
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
super.visitWhileLoop(loop);
popAssignmentTracking(oldTracker);
}
@Override
public void visitBitwiseNegationExpression(final BitwiseNegationExpression expression) {
super.visitBitwiseNegationExpression(expression);
ClassNode type = getType(expression);
ClassNode typeRe = type.redirect();
ClassNode resultType;
if (isBigIntCategory(typeRe)) {
// allow any internal number that is not a floating point one
resultType = type;
} else if (isStringType(typeRe) || isGStringType(typeRe)) {
resultType = PATTERN_TYPE;
} else if (typeRe.equals(ArrayList_TYPE)) {
resultType = ArrayList_TYPE;
} else if (typeRe.equals(PATTERN_TYPE)) {
resultType = PATTERN_TYPE;
} else {
MethodNode mn = findMethodOrFail(expression, type, "bitwiseNegate");
if (mn != null) {
resultType = mn.getReturnType();
} else {
resultType = OBJECT_TYPE;
}
}
storeType(expression, resultType);
}
@Override
public void visitUnaryPlusExpression(final UnaryPlusExpression expression) {
super.visitUnaryPlusExpression(expression);
negativeOrPositiveUnary(expression, "positive");
}
@Override
public void visitUnaryMinusExpression(final UnaryMinusExpression expression) {
super.visitUnaryMinusExpression(expression);
negativeOrPositiveUnary(expression, "negative");
}
@Override
public void visitPostfixExpression(final PostfixExpression expression) {
Expression operand = expression.getExpression();
int operator = expression.getOperation().getType();
visitPrefixOrPostifExpression(expression, operand, operator);
}
@Override
public void visitPrefixExpression(final PrefixExpression expression) {
Expression operand = expression.getExpression();
int operator = expression.getOperation().getType();
visitPrefixOrPostifExpression(expression, operand, operator);
}
private void visitPrefixOrPostifExpression(final Expression origin, final Expression operand, final int operator) {
Optional<Token> token = TokenUtil.asAssignment(operator);
// push "operand += 1" or "operand -= 1" onto stack for LHS checks
token.ifPresent(value -> typeCheckingContext.pushEnclosingBinaryExpression(binX(operand, value, constX(1))));
try {
operand.visit(this);
SetterInfo setterInfo = removeSetterInfo(operand);
if (setterInfo != null) {
BinaryExpression rewrite = typeCheckingContext.getEnclosingBinaryExpression();
rewrite.setSourcePosition(origin);
if (ensureValidSetter(rewrite, operand, rewrite.getRightExpression(), setterInfo)) {
return;
}
}
ClassNode operandType = getType(operand);
boolean isPostfix = (origin instanceof PostfixExpression);
String name = (operator == PLUS_PLUS ? "next" : operator == MINUS_MINUS ? "previous" : null);
if (name != null && isNumberType(operandType)) {
if (!isPrimitiveType(operandType)) {
MethodNode node = findMethodOrFail(varX("_dummy_", operandType), operandType, name);
if (node != null) {
storeTargetMethod(origin, node);
storeType(origin, isPostfix ? operandType : getMathWideningClassNode(operandType));
return;
}
}
storeType(origin, operandType);
return;
}
if (name != null && operandType.isDerivedFrom(Number_TYPE)) {
// special case for numbers, improve type checking as we can expect ++ and -- to return the same type
MethodNode node = findMethodOrFail(operand, operandType, name);
if (node != null) {
storeTargetMethod(origin, node);
storeType(origin, getMathWideningClassNode(operandType));
return;
}
}
if (name == null) {
addUnsupportedPreOrPostfixExpressionError(origin);
return;
}
MethodNode node = findMethodOrFail(operand, operandType, name);
if (node != null) {
storeTargetMethod(origin, node);
storeType(origin, isPostfix ? operandType : inferReturnTypeGenerics(operandType, node, ArgumentListExpression.EMPTY_ARGUMENTS));
}
} finally {
if (token.isPresent()) typeCheckingContext.popEnclosingBinaryExpression();
}
}
private static ClassNode getMathWideningClassNode(final ClassNode type) {
if (isPrimitiveByte(type) || isPrimitiveShort(type) || isPrimitiveInt(type)) {
return int_TYPE;
}
if (isWrapperByte(type) || isWrapperShort(type) || isWrapperInteger(type)) {
return Integer_TYPE;
}
if (isPrimitiveFloat(type)) {
return double_TYPE;
}
if (isWrapperFloat(type)) {
return Double_TYPE;
}
return type;
}
private void negativeOrPositiveUnary(final Expression expression, final String name) {
ClassNode type = getType(expression);
ClassNode typeRe = type.redirect();
ClassNode resultType;
if (isDoubleCategory(getUnwrapper(typeRe))) {
resultType = type;
} else if (typeRe.equals(ArrayList_TYPE)) {
resultType = ArrayList_TYPE;
} else {
MethodNode mn = findMethodOrFail(expression, type, name);
if (mn != null) {
resultType = mn.getReturnType();
} else {
resultType = type;
}
}
storeType(expression, resultType);
}
@Override
public void visitExpressionStatement(final ExpressionStatement statement) {
typeCheckingContext.pushTemporaryTypeInfo();
super.visitExpressionStatement(statement);
typeCheckingContext.popTemporaryTypeInfo();
}
@Override
public void visitReturnStatement(final ReturnStatement statement) {
if (typeCheckingContext.getEnclosingClosure() == null) {
MethodNode method = typeCheckingContext.getEnclosingMethod();
if (method != null && !method.isVoidMethod() && !method.isDynamicReturnType()) {
applyTargetType(method.getReturnType(), statement.getExpression()); // GROOVY-10660
}
}
super.visitReturnStatement(statement);
returnListener.returnStatementAdded(statement);
}
protected ClassNode checkReturnType(final ReturnStatement statement) {
Expression expression = statement.getExpression();
ClassNode type = getType(expression);
TypeCheckingContext.EnclosingClosure enclosingClosure = typeCheckingContext.getEnclosingClosure();
if (enclosingClosure != null) {
if (enclosingClosure.getClosureExpression().getNodeMetaData(INFERRED_TYPE) != null) return null; // re-visit
ClassNode inferredReturnType = getInferredReturnType(enclosingClosure.getClosureExpression());
// GROOVY-9995: return ctor call with diamond operator
if (expression instanceof ConstructorCallExpression) {
inferDiamondType((ConstructorCallExpression) expression, inferredReturnType != null ? inferredReturnType : /*GROOVY-10080:*/dynamicType());
}
if (inferredReturnType != null
&& !inferredReturnType.equals(type)
&& !isObjectType(inferredReturnType)
&& !isPrimitiveVoid(inferredReturnType)
&& !isPrimitiveBoolean(inferredReturnType)
&& !GenericsUtils.hasUnresolvedGenerics(inferredReturnType)) {
if (isStringType(inferredReturnType) && isGStringOrGStringStringLUB(type)) {
type = STRING_TYPE; // GROOVY-9971: convert GString to String at point of return
} else if (GenericsUtils.buildWildcardType(wrapTypeIfNecessary(inferredReturnType)).isCompatibleWith(wrapTypeIfNecessary(type))) {
type = inferredReturnType; // GROOVY-8310, GROOVY-10082, GROOVY-10091, GROOVY-10128, GROOVY-10306: allow simple covariance
} else if (!isPrimitiveVoid(type) && !extension.handleIncompatibleReturnType(statement, type)) { // GROOVY-10277: incompatible return value
addStaticTypeError("Cannot return value of type " + prettyPrintType(type) + " for " + (enclosingClosure.getClosureExpression() instanceof LambdaExpression ? "lambda" : "closure") + " expecting " + prettyPrintType(inferredReturnType), expression);
}
}
return type;
}
MethodNode enclosingMethod = typeCheckingContext.getEnclosingMethod();
if (enclosingMethod != null && !enclosingMethod.isVoidMethod() && !enclosingMethod.isDynamicReturnType()) {
ClassNode returnType = enclosingMethod.getReturnType();
if (!isPrimitiveVoid(getUnwrapper(type)) && !checkCompatibleAssignmentTypes(returnType, type, null, false)) {
if (!extension.handleIncompatibleReturnType(statement, type)) {
addStaticTypeError("Cannot return value of type " + prettyPrintType(type) + " for method returning " + prettyPrintType(returnType), expression);
}
} else if (implementsInterfaceOrIsSubclassOf(type, returnType)) {
BinaryExpression dummy = assignX(varX("{target}", returnType), expression, statement);
ClassNode resultType = getResultType(returnType, ASSIGN, type, dummy); // GROOVY-10295
checkTypeGenerics(returnType, resultType, expression);
}
}
return null;
}
protected void addClosureReturnType(final ClassNode returnType) {
if (returnType != null && !isPrimitiveVoid(returnType)) // GROOVY-8202
typeCheckingContext.getEnclosingClosure().addReturnType(returnType);
}
@Override
public void visitConstructorCallExpression(final ConstructorCallExpression call) {
if (!extension.beforeMethodCall(call)) {
ClassNode receiver;
if (call.isThisCall()) {
receiver = makeThis();
} else if (call.isSuperCall()) {
receiver = makeSuper();
} else {
receiver = call.getType();
}
Expression arguments = call.getArguments();
ArgumentListExpression argumentList = InvocationWriter.makeArgumentList(arguments);
visitMethodCallArguments(receiver, argumentList, false, null);
final ClassNode[] argumentTypes = getArgumentTypes(argumentList);
MethodNode ctor;
if (looksLikeNamedArgConstructor(receiver, argumentTypes)
&& findMethod(receiver, "<init>", argumentTypes).isEmpty()
&& findMethod(receiver, "<init>", init(argumentTypes)).size() == 1) {
ctor = typeCheckMapConstructor(call, receiver, arguments);
} else {
ctor = findMethodOrFail(call, receiver, "<init>", argumentTypes);
if (ctor != null) {
Parameter[] parameters = ctor.getParameters();
GenericsType[] typeParameters = ctor.getDeclaringClass().getGenericsTypes();
if (typeParameters != null) { // GROOVY-10283, GROOVY-10316, GROOVY-10482, GROOVY-10624, GROOVY-10698
Map<GenericsTypeName, GenericsType> context = extractGenericsConnectionsFromArguments(typeParameters, parameters, argumentList, receiver.getGenericsTypes());
if (!context.isEmpty()) parameters = Arrays.stream(parameters).map(p -> new Parameter(applyGenericsContext(context, p.getType()), p.getName())).toArray(Parameter[]::new);
}
resolvePlaceholdersFromImplicitTypeHints(argumentTypes, argumentList, parameters);
typeCheckMethodsWithGenericsOrFail(receiver, argumentTypes, ctor, call);
visitMethodCallArguments(receiver, argumentList, true, ctor);
checkForbiddenSpreadArgument(argumentList, parameters);
} else {
checkForbiddenSpreadArgument(argumentList);
}
}
if (ctor != null) storeTargetMethod(call, ctor);
}
// GROOVY-9327: check for AIC in STC method with non-STC enclosing class
if (call.isUsingAnonymousInnerClass()) {
Set<MethodNode> methods = typeCheckingContext.methodsToBeVisited;
if (!methods.isEmpty()) { // indicates specific methods have STC
typeCheckingContext.methodsToBeVisited = Collections.emptySet();
ClassNode anonType = call.getType();
visitClass(anonType); // visit anon. inner class inline with method
anonType.putNodeMetaData(StaticTypeCheckingVisitor.class, Boolean.TRUE);
typeCheckingContext.methodsToBeVisited = methods;
}
}
extension.afterMethodCall(call);
}
private boolean looksLikeNamedArgConstructor(final ClassNode receiver, final ClassNode[] argumentTypes) {
if (argumentTypes.length == 1 || argumentTypes.length == 2 && argumentTypes[0].equals(receiver.getOuterClass())) {
return isOrImplements(argumentTypes[argumentTypes.length - 1], MAP_TYPE);
}
return false;
}
protected MethodNode typeCheckMapConstructor(final ConstructorCallExpression call, final ClassNode receiver, final Expression arguments) {
MethodNode node = null;
if (arguments instanceof TupleExpression) {
TupleExpression texp = (TupleExpression) arguments;
List<Expression> expressions = texp.getExpressions();
// should only get here with size = 2 when inner class constructor
if (expressions.size() == 1 || expressions.size() == 2) {
Expression expression = expressions.get(expressions.size() - 1);
if (expression instanceof MapExpression) {
MapExpression argList = (MapExpression) expression;
checkGroovyConstructorMap(call, receiver, argList);
Parameter[] params = expressions.size() == 1
? new Parameter[]{new Parameter(MAP_TYPE, "map")}
: new Parameter[]{new Parameter(receiver.redirect().getOuterClass(), "$p$"), new Parameter(MAP_TYPE, "map")};
node = new ConstructorNode(Opcodes.ACC_PUBLIC, params, ClassNode.EMPTY_ARRAY, GENERATED_EMPTY_STATEMENT);
node.setDeclaringClass(receiver);
}
}
}
return node;
}
protected ClassNode[] getArgumentTypes(final ArgumentListExpression argumentList) {
return argumentList.getExpressions().stream().map(exp ->
isNullConstant(exp) ? UNKNOWN_PARAMETER_TYPE : getType(exp)
).toArray(ClassNode[]::new);
}
private ClassNode getInferredTypeFromTempInfo(final Expression expression, final ClassNode expressionType) {
if (expression instanceof VariableExpression && !typeCheckingContext.temporaryIfBranchTypeInformation.isEmpty()) {
List<ClassNode> tempTypes = getTemporaryTypesForExpression(expression);
if (tempTypes != null && !tempTypes.isEmpty()) {
List<ClassNode> types = new ArrayList<>(tempTypes.size() + 1);
if (expressionType != null && !isObjectType(expressionType) // GROOVY-7333
&& tempTypes.stream().noneMatch(t -> implementsInterfaceOrIsSubclassOf(t, expressionType))) { // GROOVY-9769
types.add(expressionType);
}
types.addAll(tempTypes);
if (types.isEmpty()) {
return OBJECT_TYPE;
} else if (types.size() == 1) {
return types.get(0);
} else {
return new UnionTypeClassNode(types.toArray(ClassNode.EMPTY_ARRAY));
}
}
}
return expressionType;
}
@Override
public void visitClosureExpression(final ClosureExpression expression) {
// collect every variable expression used in the closure body
Map<VariableExpression, ClassNode> varTypes = new HashMap<>();
expression.getCode().visit(new VariableExpressionTypeMemoizer(varTypes, true));
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
SharedVariableCollector collector = new SharedVariableCollector(getSourceUnit());
collector.visitClosureExpression(expression);
Set<VariableExpression> closureSharedVariables = collector.getClosureSharedExpressions();
Map<VariableExpression, Map<StaticTypesMarker, Object>> variableMetadata;
if (!closureSharedVariables.isEmpty()) {
// GROOVY-6921: call getType in order to update closure shared variables
// whose types are inferred thanks to closure parameter type inference
for (VariableExpression ve : closureSharedVariables) {
getType(ve);
}
variableMetadata = new HashMap<>();
saveVariableExpressionMetadata(closureSharedVariables, variableMetadata);
} else {
variableMetadata = null;
}
// perform visit
typeCheckingContext.pushEnclosingClosureExpression(expression);
DelegationMetadata dmd = getDelegationMetadata(expression);
if (dmd != null) {
typeCheckingContext.delegationMetadata = newDelegationMetadata(dmd.getType(), dmd.getStrategy());
} else {
typeCheckingContext.delegationMetadata = newDelegationMetadata(typeCheckingContext.getEnclosingClassNode(), Closure.OWNER_FIRST);
}
super.visitClosureExpression(expression);
typeCheckingContext.delegationMetadata = typeCheckingContext.delegationMetadata.getParent();
returnAdder.visitMethod(new MethodNode("dummy", 0, OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, expression.getCode()));
TypeCheckingContext.EnclosingClosure enclosingClosure = typeCheckingContext.popEnclosingClosure();
if (!enclosingClosure.getReturnTypes().isEmpty()) { // populated by ReturnAdder
ClassNode returnType = lowestUpperBound(enclosingClosure.getReturnTypes());
storeInferredReturnType(expression, wrapTypeIfNecessary(returnType));
storeType(expression, wrapClosureType(returnType));
}
// check types of closure shared variables for change
if (isSecondPassNeededForControlStructure(varTypes, oldTracker)) {
visitClosureExpression(expression);
}
// restore original metadata
restoreVariableExpressionMetadata(variableMetadata);
for (Parameter parameter : getParametersSafe(expression)) {
typeCheckingContext.controlStructureVariables.remove(parameter);
// GROOVY-10072: visit param default argument expression if present
visitInitialExpression(parameter.getInitialExpression(), varX(parameter), parameter);
}
}
@Override
public void visitMethodPointerExpression(final MethodPointerExpression expression) {
super.visitMethodPointerExpression(expression);
Expression nameExpr = expression.getMethodName();
if (nameExpr instanceof ConstantExpression
&& isStringType(getType(nameExpr))) {
String nameText = nameExpr.getText();
if ("new".equals(nameText)) {
ClassNode receiverType = getType(expression.getExpression());
if (isClassClassNodeWrappingConcreteType(receiverType)) {
storeType(expression, wrapClosureType(receiverType));
}
return;
}
List<Receiver<String>> receivers = new ArrayList<>();
addReceivers(receivers, makeOwnerList(expression.getExpression()), false);
ClassNode receiverType = null;
List<MethodNode> candidates = EMPTY_METHODNODE_LIST;
for (Receiver<String> currentReceiver : receivers) {
receiverType = wrapTypeIfNecessary(currentReceiver.getType());
candidates = findMethodsWithGenerated(receiverType, nameText);
candidates.addAll(findDGMMethodsForClassNode(getSourceUnit().getClassLoader(), receiverType, nameText));
candidates = filterMethodsByVisibility(candidates, typeCheckingContext.getEnclosingClassNode());
if (!candidates.isEmpty()) {
break;
}
}
if (candidates.isEmpty()) {
candidates = extension.handleMissingMethod(
getType(expression.getExpression()), nameText, null, null, null);
} else if (candidates.size() > 1) {
candidates = extension.handleAmbiguousMethods(candidates, expression);
}
if (!candidates.isEmpty()) {
int nParameters = candidates.stream().mapToInt(m -> m.getParameters().length).reduce((i,j) -> i == j ? i : -1).getAsInt();
Map<GenericsTypeName, GenericsType> gts = GenericsUtils.extractPlaceholders(receiverType);
candidates.stream().map(candidate -> applyGenericsContext(gts, candidate.getReturnType()))
.reduce(WideningCategories::lowestUpperBound).ifPresent(returnType -> {
ClassNode closureType = wrapClosureType(returnType);
closureType.putNodeMetaData(CLOSURE_ARGUMENTS, nParameters); // GROOVY-10714
storeType(expression, closureType);
});
expression.putNodeMetaData(MethodNode.class, candidates);
} else if (!(expression instanceof MethodReferenceExpression)) {
ClassNode type = wrapTypeIfNecessary(getType(expression.getExpression()));
if (isClassClassNodeWrappingConcreteType(type)) type = type.getGenericsTypes()[0].getType();
addStaticTypeError("Cannot find matching method " + prettyPrintTypeName(type) + "#" + nameText + ". Please check if the declared type is correct and if the method exists.", nameExpr);
}
}
}
private static ClassNode wrapClosureType(final ClassNode returnType) {
return makeClassSafe0(CLOSURE_TYPE, wrapTypeIfNecessary(returnType).asGenericsType());
}
protected DelegationMetadata getDelegationMetadata(final ClosureExpression expression) {
return expression.getNodeMetaData(DELEGATION_METADATA);
}
private DelegationMetadata newDelegationMetadata(final ClassNode delegateType, final int resolveStrategy) {
return new DelegationMetadata(delegateType, resolveStrategy, typeCheckingContext.delegationMetadata);
}
protected void restoreVariableExpressionMetadata(final Map<VariableExpression, Map<StaticTypesMarker, Object>> typesBeforeVisit) {
if (typesBeforeVisit != null) {
typesBeforeVisit.forEach((var, map) -> {
for (StaticTypesMarker marker : StaticTypesMarker.values()) {
// GROOVY-9344, GROOVY-9516: keep type
if (marker == INFERRED_TYPE) continue;
Object value = map.get(marker);
if (value == null) {
var.removeNodeMetaData(marker);
} else {
var.putNodeMetaData(marker, value);
}
}
var.removeNodeMetaData(DECLARATION_INFERRED_TYPE); // GROOVY-8946
});
}
}
protected void saveVariableExpressionMetadata(final Set<VariableExpression> closureSharedExpressions, final Map<VariableExpression, Map<StaticTypesMarker, Object>> typesBeforeVisit) {
for (VariableExpression ve : closureSharedExpressions) {
Variable v;
while ((v = ve.getAccessedVariable()) != ve && v instanceof VariableExpression) {
ve = (VariableExpression) v;
}
Map<StaticTypesMarker, Object> metadata = new EnumMap<>(StaticTypesMarker.class);
for (StaticTypesMarker marker : StaticTypesMarker.values()) {
Object value = ve.getNodeMetaData(marker);
if (value != null) {
metadata.put(marker, value);
}
}
typesBeforeVisit.put(ve, metadata);
}
}
@Override
public void visitConstructor(final ConstructorNode node) {
if (shouldSkipMethodNode(node)) {
return;
}
super.visitConstructor(node);
}
@Override
public void visitMethod(final MethodNode node) {
if (shouldSkipMethodNode(node)) {
return;
}
if (!extension.beforeVisitMethod(node)) {
ErrorCollector collector = node.getNodeMetaData(ERROR_COLLECTOR);
if (collector != null) {
typeCheckingContext.getErrorCollector().addCollectorContents(collector);
} else {
startMethodInference(node, typeCheckingContext.getErrorCollector());
}
node.removeNodeMetaData(ERROR_COLLECTOR);
}
extension.afterVisitMethod(node);
}
protected void startMethodInference(final MethodNode node, final ErrorCollector collector) {
// second, we must ensure that this method MUST be statically checked
// for example, in a mixed mode where only some methods are statically checked
// we must not visit a method which used dynamic dispatch.
// We do not check for an annotation because some other AST transformations
// may use this visitor without the annotation being explicitly set
if ((typeCheckingContext.methodsToBeVisited.isEmpty() || typeCheckingContext.methodsToBeVisited.contains(node))
&& typeCheckingContext.alreadyVisitedMethods.add(node)) { // prevent re-visiting method (infinite loop)
typeCheckingContext.pushErrorCollector(collector);
boolean osc = typeCheckingContext.isInStaticContext;
try {
// GROOVY-7890: non-static trait method is static in helper type
typeCheckingContext.isInStaticContext = isNonStaticHelperMethod(node) ? false : node.isStatic();
super.visitMethod(node);
} finally {
typeCheckingContext.isInStaticContext = osc;
}
typeCheckingContext.popErrorCollector();
node.putNodeMetaData(ERROR_COLLECTOR, collector);
}
}
@Override
protected void visitConstructorOrMethod(final MethodNode node, final boolean isConstructor) {
typeCheckingContext.pushEnclosingMethod(node);
final ClassNode returnType = node.getReturnType(); // GROOVY-10660: implicit return case
if (!isConstructor && (isClosureWithType(returnType) || isFunctionalInterface(returnType))) {
new ReturnAdder(returnStmt -> applyTargetType(returnType, returnStmt.getExpression())).visitMethod(node);
}
readClosureParameterAnnotation(node); // GROOVY-6603
super.visitConstructorOrMethod(node, isConstructor);
if (node.hasDefaultValue()) {
visitDefaultParameterArguments(node.getParameters());
}
if (!isConstructor) {
returnAdder.visitMethod(node); // GROOVY-7753: we cannot count these auto-generated return statements, see `typeCheckingContext.pushEnclosingReturnStatement`
}
typeCheckingContext.popEnclosingMethod();
}
private void readClosureParameterAnnotation(final MethodNode node) {
for (Parameter parameter : node.getParameters()) {
for (AnnotationNode annotation : parameter.getAnnotations()) {
if (annotation.getClassNode().equals(CLOSUREPARAMS_CLASSNODE)) {
// GROOVY-6603: propagate closure parameter types
Expression value = annotation.getMember("value");
Expression options = annotation.getMember("options");
List<ClassNode[]> signatures = getSignaturesFromHint(node, value, options, annotation);
if (signatures.size() == 1) { // TODO: handle multiple signatures
parameter.putNodeMetaData(CLOSURE_ARGUMENTS, Arrays.stream(signatures.get(0)).map(t -> new Parameter(t,"")).toArray(Parameter[]::new));
}
}
}
}
}
private void visitDefaultParameterArguments(final Parameter[] parameters) {
for (Parameter parameter : parameters) {
if (!parameter.hasInitialExpression()) continue;
// GROOVY-10094: visit param default argument expression
visitInitialExpression(parameter.getInitialExpression(), varX(parameter), parameter);
// GROOVY-10104: remove direct target setting to prevent errors
parameter.getInitialExpression().visit(new CodeVisitorSupport() {
@Override
public void visitMethodCallExpression(final MethodCallExpression mce) {
super.visitMethodCallExpression(mce);
mce.setMethodTarget(null);
}
});
}
}
@Override
protected void visitObjectInitializerStatements(final ClassNode node) {
// GROOVY-5450: create fake constructor node so final field analysis can allow write within non-static initializer block(s)
ConstructorNode init = new ConstructorNode(0, null, null, new BlockStatement(node.getObjectInitializerStatements(), null));
typeCheckingContext.pushEnclosingMethod(init);
super.visitObjectInitializerStatements(node);
typeCheckingContext.popEnclosingMethod();
}
protected void addTypeCheckingInfoAnnotation(final MethodNode node) {
// TypeChecked$TypeCheckingInfo cannot be applied on constructors
if (node.isConstructor()) return;
// if a returned inferred type is available and no @TypeCheckingInfo is on node, then add an
// annotation to the method node
ClassNode rtype = getInferredReturnType(node);
if (rtype != null && node.getAnnotations(TYPECHECKING_INFO_NODE).isEmpty()) {
AnnotationNode anno = new AnnotationNode(TYPECHECKING_INFO_NODE);
anno.setMember("version", CURRENT_SIGNATURE_PROTOCOL);
SignatureCodec codec = SignatureCodecFactory.getCodec(CURRENT_SIGNATURE_PROTOCOL_VERSION, getTransformLoader());
String genericsSignature = codec.encode(rtype);
if (genericsSignature != null) {
ConstantExpression signature = new ConstantExpression(genericsSignature);
signature.setType(STRING_TYPE);
anno.setMember("inferredType", signature);
node.addAnnotation(anno);
}
}
}
@Override
public void visitStaticMethodCallExpression(final StaticMethodCallExpression call) {
String name = call.getMethod();
if (name == null) {
addStaticTypeError("cannot resolve dynamic method name at compile time.", call);
return;
}
if (extension.beforeMethodCall(call)) {
extension.afterMethodCall(call);
return;
}
ClassNode receiver = call.getOwnerType();
ArgumentListExpression argumentList = InvocationWriter.makeArgumentList(call.getArguments());
visitMethodCallArguments(receiver, argumentList, false, null);
ClassNode[] args = getArgumentTypes(argumentList);
try {
// method call receivers are :
// - possible "with" receivers
// - the actual receiver as found in the method call expression
// - any of the potential receivers found in the instanceof temporary table
// in that order
List<Receiver<String>> receivers = new LinkedList<>();
addReceivers(receivers, makeOwnerList(new ClassExpression(receiver)), false);
List<MethodNode> mn = null;
Receiver<String> chosenReceiver = null;
for (Receiver<String> currentReceiver : receivers) {
mn = findMethod(currentReceiver.getType(), name, args);
if (!mn.isEmpty()) {
if (mn.size() == 1) {
// GROOVY-8909, GROOVY-8961, GROOVY-9734, GROOVY-9844, GROOVY-9915, et al.
resolvePlaceholdersFromImplicitTypeHints(args, argumentList, mn.get(0).getParameters());
typeCheckMethodsWithGenericsOrFail(currentReceiver.getType(), args, mn.get(0), call);
}
chosenReceiver = currentReceiver;
break;
}
}
if (mn.isEmpty()) {
mn = extension.handleMissingMethod(receiver, name, argumentList, args, call);
}
boolean callArgsVisited = false;
if (mn.isEmpty()) {
addNoMatchingMethodError(receiver, name, args, call);
} else {
mn = disambiguateMethods(mn, receiver, args, call);
if (mn.size() == 1) {
MethodNode directMethodCallCandidate = mn.get(0);
ClassNode returnType = getType(directMethodCallCandidate);
if (returnType.isUsingGenerics() && !returnType.isEnum()) {
visitMethodCallArguments(receiver, argumentList, true, directMethodCallCandidate); callArgsVisited = true;
ClassNode rt = inferReturnTypeGenerics(chosenReceiver.getType(), directMethodCallCandidate, argumentList);
if (rt != null && implementsInterfaceOrIsSubclassOf(rt, returnType))
returnType = rt;
}
storeType(call, returnType);
storeTargetMethod(call, directMethodCallCandidate);
} else {
addAmbiguousErrorMessage(mn, name, args, call);
}
}
MethodNode target = call.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
if (!callArgsVisited) {
visitMethodCallArguments(receiver, argumentList, true, target);
}
if (target != null) { Parameter[] params = target.getParameters();
checkClosureMetadata(argumentList.getExpressions(), params);
checkForbiddenSpreadArgument(argumentList, params);
} else {
checkForbiddenSpreadArgument(argumentList);
}
} finally {
extension.afterMethodCall(call);
}
}
/**
* @deprecated this method is unused, replaced with {@link DelegatesTo} inference.
*/
@Deprecated
protected void checkClosureParameters(final Expression callArguments, final ClassNode receiver) {
if (callArguments instanceof ArgumentListExpression) {
ArgumentListExpression argList = (ArgumentListExpression) callArguments;
ClosureExpression closure = (ClosureExpression) argList.getExpression(0);
Parameter[] parameters = closure.getParameters();
if (parameters.length > 1) {
addStaticTypeError("Unexpected number of parameters for a with call", argList);
} else if (parameters.length == 1) {
Parameter param = parameters[0];
if (!param.isDynamicTyped() && !isAssignableTo(receiver, param.getType().redirect())) {
addStaticTypeError("Expected parameter type: " + prettyPrintType(receiver) + " but was: " + prettyPrintType(param.getType()), param);
}
}
closure.putNodeMetaData(DELEGATION_METADATA, newDelegationMetadata(receiver, Closure.DELEGATE_FIRST));
}
}
/**
* Visits a method call target, to infer the type. Don't report errors right
* away, that will be done by a later visitMethod call.
*/
protected void silentlyVisitMethodNode(final MethodNode directMethodCallCandidate) {
// visit is authorized because the classnode belongs to the same source unit
ErrorCollector collector = new ErrorCollector(typeCheckingContext.getErrorCollector().getConfiguration());
startMethodInference(directMethodCallCandidate, collector);
}
protected void visitMethodCallArguments(final ClassNode receiver, final ArgumentListExpression arguments, final boolean visitClosures, final MethodNode selectedMethod) {
Parameter[] parameters;
List<Expression> expressions = new ArrayList<>();
if (selectedMethod instanceof ExtensionMethodNode) {
parameters = ((ExtensionMethodNode) selectedMethod).getExtensionMethodNode().getParameters();
expressions.add(varX("$self", receiver));
} else {
parameters = selectedMethod != null ? selectedMethod.getParameters() : Parameter.EMPTY_ARRAY;
}
expressions.addAll(arguments.getExpressions());
int nExpressions = expressions.size();
int nthParameter = parameters.length - 1;
for (int i = 0; i < nExpressions; i += 1) {
Expression expression = expressions.get(i);
if (visitClosures && expression instanceof ClosureExpression
|| !visitClosures && !(expression instanceof ClosureExpression)) {
if (visitClosures && nthParameter != -1) { // GROOVY-10636: vargs call
ClosureExpression source = (ClosureExpression) expression;
Parameter target = parameters[Math.min(i, nthParameter)];
ClassNode targetType = target.getType();
if (targetType.isArray() && i >= nthParameter)
targetType = targetType.getComponentType();
checkClosureWithDelegatesTo(receiver, selectedMethod, args(expressions), parameters, source, target);
if (selectedMethod instanceof ExtensionMethodNode) {
if (i > 0) {
inferClosureParameterTypes(receiver, arguments, source, target, selectedMethod);
}
} else {
inferClosureParameterTypes(receiver, arguments, source, target, selectedMethod);
}
if (isFunctionalInterface(targetType)) {
storeInferredReturnType(source, GenericsUtils.parameterizeSAM(targetType).getV2());
} else if (isClosureWithType(targetType)) {
storeInferredReturnType(source, getCombinedBoundType(targetType.getGenericsTypes()[0]));
}
}
expression.visit(this);
expression.removeNodeMetaData(DELEGATION_METADATA);
}
if (i == 0 && parameters.length > 0 && expression instanceof MapExpression) {
checkNamedParamsAnnotation(parameters[0], (MapExpression) expression);
}
}
if (visitClosures) {
inferMethodReferenceType(receiver, arguments, selectedMethod);
}
}
private void checkNamedParamsAnnotation(final Parameter param, final MapExpression args) {
if (!isOrImplements(param.getType(), MAP_TYPE)) return;
List<MapEntryExpression> entryExpressions = args.getMapEntryExpressions();
Map<Object, Expression> entries = new LinkedHashMap<>();
for (MapEntryExpression entry : entryExpressions) {
Object key = entry.getKeyExpression();
if (key instanceof ConstantExpression) {
key = ((ConstantExpression) key).getValue();
}
entries.put(key, entry.getValueExpression());
}
List<String> collectedNames = new ArrayList<>();
List<AnnotationNode> annotations = param.getAnnotations(NAMED_PARAMS_CLASSNODE);
if (annotations != null && !annotations.isEmpty()) {
AnnotationNode an = null;
for (AnnotationNode next : annotations) {
if (next.getClassNode().getName().equals(NamedParams.class.getName())) {
an = next;
}
}
if (an != null) {
Expression value = an.getMember("value");
if (value instanceof AnnotationConstantExpression) {
processNamedParam((AnnotationConstantExpression) value, entries, args, collectedNames);
} else if (value instanceof ListExpression) {
ListExpression le = (ListExpression) value;
for (Expression next : le.getExpressions()) {
if (next instanceof AnnotationConstantExpression) {
processNamedParam((AnnotationConstantExpression) next, entries, args, collectedNames);
}
}
}
}
}
annotations = param.getAnnotations(NAMED_PARAM_CLASSNODE);
if (annotations != null && !annotations.isEmpty()) {
for (AnnotationNode next : annotations) {
if (next.getClassNode().getName().equals(NamedParam.class.getName())) {
processNamedParam(next, entries, args, collectedNames);
}
}
}
if (!collectedNames.isEmpty()) {
for (Map.Entry<Object, Expression> entry : entries.entrySet()) {
if (!collectedNames.contains(entry.getKey())) {
addStaticTypeError("unexpected named arg: " + entry.getKey(), args);
}
}
}
}
private void processNamedParam(final AnnotationConstantExpression value, final Map<Object, Expression> entries, final Expression expression, final List<String> collectedNames) {
AnnotationNode namedParam = (AnnotationNode) value.getValue();
if (!namedParam.getClassNode().getName().equals(NamedParam.class.getName())) return;
processNamedParam(namedParam, entries, expression, collectedNames);
}
private void processNamedParam(final AnnotationNode namedParam, final Map<Object, Expression> entries, final Expression expression, final List<String> collectedNames) {
String name = null;
boolean required = false;
ClassNode expectedType = null;
ConstantExpression constX = (ConstantExpression) namedParam.getMember("value");
if (constX != null) {
name = (String) constX.getValue();
collectedNames.add(name);
}
constX = (ConstantExpression) namedParam.getMember("required");
if (constX != null) {
required = (Boolean) constX.getValue();
}
ClassExpression typeX = (ClassExpression) namedParam.getMember("type");
if (typeX != null) {
expectedType = typeX.getType();
}
if (!entries.containsKey(name)) {
if (required) {
addStaticTypeError("required named param '" + name + "' not found.", expression);
}
} else if (expectedType != null) {
ClassNode argumentType = getDeclaredOrInferredType(entries.get(name));
if (!isAssignableTo(argumentType, expectedType)) {
addStaticTypeError("argument for named param '" + name + "' has type '" + prettyPrintType(argumentType) + "' but expected '" + prettyPrintType(expectedType) + "'.", expression);
}
}
}
/**
* Performs type inference on closure argument types whenever code like this
* is found: <code>foo.collect { it.toUpperCase() }</code>.
* <p>
* In this case the type checker tries to find if the {@code collect} method
* has its {@link Closure} argument annotated with {@link ClosureParams}. If
* so, then additional type inference can be performed and the type of
* {@code it} may be inferred.
*
* @param receiver
* @param arguments
* @param expression closure or lambda expression for which the argument types should be inferred
* @param target parameter which may provide {@link ClosureParams} annotation or SAM type
* @param method method that declares {@code target}
*/
protected void inferClosureParameterTypes(final ClassNode receiver, final Expression arguments, final ClosureExpression expression, final Parameter target, final MethodNode method) {
List<AnnotationNode> annotations = target.getAnnotations(CLOSUREPARAMS_CLASSNODE);
if (annotations != null && !annotations.isEmpty()) {
for (AnnotationNode annotation : annotations) {
Expression value = annotation.getMember("value");
Expression options = annotation.getMember("options");
Expression conflictResolver = annotation.getMember("conflictResolutionStrategy");
doInferClosureParameterTypes(receiver, arguments, expression, method, value, conflictResolver, options);
}
} else if (isSAMType(target.getOriginType())) { // SAM-type coercion
boolean isConstructor = method.isConstructor();
boolean hasTypeArguments = asBoolean(receiver.getGenericsTypes());
Map<GenericsTypeName, GenericsType> context = isConstructor && !hasTypeArguments ? new HashMap<>() // GROOVY-10699
: extractPlaceHoldersVisibleToDeclaration(receiver, method, arguments);
GenericsType[] typeParameters = isConstructor ? method.getDeclaringClass().getGenericsTypes() : applyGenericsContext(context, method.getGenericsTypes());
if (typeParameters != null) {
boolean typeParametersResolved = false;
// first check for explicit type arguments
if (isConstructor) {
typeParametersResolved = hasTypeArguments;
} else {
Expression emc = typeCheckingContext.getEnclosingMethodCall();
if (emc instanceof MethodCallExpression) {
MethodCallExpression mce = (MethodCallExpression) emc;
if (mce.getArguments() == arguments) {
GenericsType[] typeArguments = mce.getGenericsTypes();
if (typeArguments != null) {
int n = typeParameters.length;
if (n == typeArguments.length) {
typeParametersResolved = true;
for (int i = 0; i < n; i += 1) {
context.put(new GenericsTypeName(typeParameters[i].getName()), typeArguments[i]);
}
}
}
}
}
}
if (!typeParametersResolved) {
// check for implicit type arguments
int i = -1; Parameter[] p = method.getParameters();
for (Expression argument : (ArgumentListExpression) arguments) { i += 1;
if (isNullConstant(argument)) continue;
ClassNode pType = p[Math.min(i, p.length - 1)].getType();
Map<GenericsTypeName, GenericsType> gc = new HashMap<>();
extractGenericsConnections(gc, wrapTypeIfNecessary(getType(argument)), pType);
// GROOVY-10436: extract generics connections from closure parameter declaration(s)
if (argument == expression || (argument instanceof ClosureExpression && isSAMType(pType))) {
Parameter[] q = getParametersSafe((ClosureExpression) argument);
ClassNode[] r = extractTypesFromParameters(q); // maybe typed
ClassNode[] s = GenericsUtils.parameterizeSAM(pType).getV1();
for (int j = 0; j < r.length && j < s.length; j += 1)
if (!q[j].isDynamicTyped()) extractGenericsConnections(gc, r[j], s[j]);
}
gc.forEach((key, gt) -> {
for (GenericsType tp : typeParameters) {
if (tp.getName().equals(key.getName())) {
context.putIfAbsent(key, gt); // TODO: merge
break;
}
}
});
}
for (GenericsType tp : typeParameters) {
context.computeIfAbsent(new GenericsTypeName(tp.getName()), x -> fullyResolve(tp, context));
}
}
}
ClassNode[] samParamTypes = GenericsUtils.parameterizeSAM(applyGenericsContext(context, target.getType())).getV1();
ClassNode[] paramTypes = expression.getNodeMetaData(CLOSURE_ARGUMENTS);
if (paramTypes == null) {
int n; Parameter[] p = expression.getParameters();
if (p == null) {
// zero parameters
paramTypes = ClassNode.EMPTY_ARRAY;
} else if ((n = p.length) == 0) {
// implicit parameter(s)
paramTypes = samParamTypes;
} else { // TODO: error for length mismatch
paramTypes = Arrays.copyOf(samParamTypes, n);
for (int i = 0; i < Math.min(n, samParamTypes.length); i += 1) {
checkParamType(p[i], paramTypes[i], i == n-1, expression instanceof LambdaExpression);
}
}
expression.putNodeMetaData(CLOSURE_ARGUMENTS, paramTypes);
}
}
}
private List<ClassNode[]> getSignaturesFromHint(final MethodNode mn, final Expression hintType, final Expression options, final ASTNode usage) {
String hintTypeName = hintType.getText(); // load hint class using compiler's classloader
try {
@SuppressWarnings("unchecked")
Class<? extends ClosureSignatureHint> hintClass = (Class<? extends ClosureSignatureHint>) getTransformLoader().loadClass(hintTypeName);
List<ClassNode[]> closureSignatures = hintClass.getDeclaredConstructor().newInstance().getClosureSignatures(
mn instanceof ExtensionMethodNode ? ((ExtensionMethodNode) mn).getExtensionMethodNode() : mn,
typeCheckingContext.getSource(),
typeCheckingContext.getCompilationUnit(),
convertToStringArray(options),
usage);
return closureSignatures;
} catch (ReflectiveOperationException e) {
throw new GroovyBugError(e);
}
}
private List<ClassNode[]> resolveWithResolver(final List<ClassNode[]> candidates, final ClassNode receiver, final Expression arguments, final ClosureExpression expression, final MethodNode selectedMethod, final Expression resolverClass, final Expression options) {
// initialize resolver
try {
ClassLoader transformLoader = getTransformLoader();
@SuppressWarnings("unchecked")
Class<? extends ClosureSignatureConflictResolver> resolver = (Class<? extends ClosureSignatureConflictResolver>) transformLoader.loadClass(resolverClass.getText());
ClosureSignatureConflictResolver resolverInstance = resolver.getDeclaredConstructor().newInstance();
return resolverInstance.resolve(
candidates,
receiver,
arguments,
expression,
selectedMethod instanceof ExtensionMethodNode ? ((ExtensionMethodNode) selectedMethod).getExtensionMethodNode() : selectedMethod,
typeCheckingContext.getSource(),
typeCheckingContext.getCompilationUnit(),
convertToStringArray(options));
} catch (ClassNotFoundException | IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
throw new GroovyBugError(e);
}
}
private ClassLoader getTransformLoader() {
return Optional.ofNullable(typeCheckingContext.getCompilationUnit()).map(CompilationUnit::getTransformLoader).orElseGet(() -> getSourceUnit().getClassLoader());
}
private void doInferClosureParameterTypes(final ClassNode receiver, final Expression arguments, final ClosureExpression expression, final MethodNode selectedMethod, final Expression hintClass, final Expression resolverClass, final Expression options) {
Parameter[] closureParams = expression.getParameters();
if (closureParams == null) return; // no-arg closure
List<ClassNode[]> closureSignatures = getSignaturesFromHint(selectedMethod, hintClass, options, expression);
List<ClassNode[]> candidates = new LinkedList<>();
for (ClassNode[] signature : closureSignatures) {
resolveGenericsFromTypeHint(receiver, arguments, selectedMethod, signature);
if (signature.length == closureParams.length // same number of arguments
|| (signature.length == 1 && closureParams.length == 0) // implicit it
|| (closureParams.length > signature.length && last(signature).isArray())) { // vargs
candidates.add(signature);
}
}
if (candidates.size() > 1) {
for (Iterator<ClassNode[]> candIt = candidates.iterator(); candIt.hasNext(); ) {
ClassNode[] inferred = candIt.next();
for (int i = 0, n = closureParams.length; i < n; i += 1) {
Parameter closureParam = closureParams[i];
ClassNode declaredType = closureParam.getOriginType();
ClassNode inferredType;
if (i < inferred.length - 1 || inferred.length == n) {
inferredType = inferred[i];
} else {
ClassNode lastInferred = inferred[inferred.length - 1];
if (lastInferred.isArray()) {
inferredType = lastInferred.getComponentType();
} else {
candIt.remove();
continue;
}
}
if (!typeCheckMethodArgumentWithGenerics(declaredType, inferredType, i == (n - 1))) {
candIt.remove();
}
}
}
if (candidates.size() > 1 && resolverClass instanceof ClassExpression) {
candidates = resolveWithResolver(candidates, receiver, arguments, expression, selectedMethod, resolverClass, options);
}
if (candidates.size() > 1) {
addError("Ambiguous prototypes for closure. More than one target method matches. Please use explicit argument types.", expression);
}
}
if (candidates.size() == 1) {
ClassNode[] inferred = candidates.get(0);
if (closureParams.length == 0 && inferred.length == 1) {
expression.putNodeMetaData(CLOSURE_ARGUMENTS, inferred);
} else {
for (int i = 0, n = closureParams.length; i < n; i += 1) {
Parameter closureParam = closureParams[i];
ClassNode inferredType = OBJECT_TYPE;
if (i < inferred.length - 1 || inferred.length == n) {
inferredType = inferred[i];
} else {
ClassNode lastInferred = inferred[inferred.length - 1];
if (lastInferred.isArray()) {
inferredType = lastInferred.getComponentType();
} else {
addError("Incorrect number of parameters. Expected " + inferred.length + " but found " + n, expression);
}
}
checkParamType(closureParam, inferredType, i == n-1, false);
typeCheckingContext.controlStructureVariables.put(closureParam, inferredType);
}
}
}
}
/**
* Computes the inferred types of the closure parameters using the following trick:
* <ol>
* <li> creates a dummy MethodNode for which the return type is a class node
* for which the generic types are the types returned by the hint
* <li> calls {@link #inferReturnTypeGenerics}
* <li> returns inferred types from the result
* </ol>
* In practice it could be done differently but it has the main advantage of
* reusing existing code, hence reducing the amount of code to debug in case
* of failure.
*/
private void resolveGenericsFromTypeHint(final ClassNode receiver, final Expression arguments, final MethodNode selectedMethod, final ClassNode[] signature) {
ClassNode returnType = new ClassNode("ClForInference$" + UNIQUE_LONG.incrementAndGet(), 0, OBJECT_TYPE).getPlainNodeReference();
returnType.setGenericsTypes(Arrays.stream(signature).map(ClassNode::asGenericsType).toArray(GenericsType[]::new));
MethodNode methodNode = selectedMethod instanceof ExtensionMethodNode ? ((ExtensionMethodNode) selectedMethod).getExtensionMethodNode() : selectedMethod;
methodNode = new MethodNode("$$", methodNode.getModifiers(), returnType, methodNode.getParameters(), methodNode.getExceptions(), null);
methodNode.setDeclaringClass(selectedMethod.getDeclaringClass());
methodNode.setGenericsTypes(selectedMethod.getGenericsTypes());
if (selectedMethod instanceof ExtensionMethodNode) {
methodNode = new ExtensionMethodNode(
methodNode,
methodNode.getName(),
methodNode.getModifiers(),
returnType,
selectedMethod.getParameters(),
selectedMethod.getExceptions(),
null,
((ExtensionMethodNode) selectedMethod).isStaticExtension()
);
methodNode.setDeclaringClass(selectedMethod.getDeclaringClass());
methodNode.setGenericsTypes(selectedMethod.getGenericsTypes());
}
returnType = inferReturnTypeGenerics(receiver, methodNode, arguments);
GenericsType[] returnTypeGenerics = returnType.getGenericsTypes();
for (int i = 0, n = returnTypeGenerics.length; i < n; i += 1) {
GenericsType gt = returnTypeGenerics[i];
if (gt.isPlaceholder()) { // GROOVY-9968, GROOVY-10528, et al.
signature[i] = gt.getUpperBounds() != null ? gt.getUpperBounds()[0] : gt.getType().redirect();
} else {
signature[i] = getCombinedBoundType(gt);
}
}
}
private static String[] convertToStringArray(final Expression options) {
if (options == null) {
return ResolveVisitor.EMPTY_STRING_ARRAY;
}
if (options instanceof ConstantExpression) {
return new String[]{options.getText()};
}
if (options instanceof ListExpression) {
return ((ListExpression) options).getExpressions().stream().map(Expression::getText).toArray(String[]::new);
}
throw new IllegalArgumentException("Unexpected options for @ClosureParams:" + options);
}
private void checkClosureWithDelegatesTo(final ClassNode receiver, final MethodNode mn, final ArgumentListExpression arguments, final Parameter[] params, final Expression expression, final Parameter param) {
List<AnnotationNode> annotations = param.getAnnotations(DELEGATES_TO);
if (annotations != null && !annotations.isEmpty()) {
for (AnnotationNode annotation : annotations) {
// in theory, there can only be one annotation of that type
Expression value = annotation.getMember("value");
Expression strategy = annotation.getMember("strategy");
Expression genericTypeIndex = annotation.getMember("genericTypeIndex");
Expression type = annotation.getMember("type");
Integer stInt = Closure.OWNER_FIRST;
if (strategy != null) {
stInt = (Integer) evaluateExpression(castX(Integer_TYPE, strategy), getSourceUnit().getConfiguration());
}
if (value instanceof ClassExpression && !value.getType().equals(DELEGATES_TO_TARGET)) {
if (genericTypeIndex != null) {
addStaticTypeError("Cannot use @DelegatesTo(genericTypeIndex=" + genericTypeIndex.getText()
+ ") without @DelegatesTo.Target because generic argument types are not available at runtime", value);
}
// temporarily store the delegation strategy and the delegate type
expression.putNodeMetaData(DELEGATION_METADATA, newDelegationMetadata(value.getType(), stInt));
} else if (type != null && !"".equals(type.getText()) && type instanceof ConstantExpression) {
String typeString = type.getText();
ClassNode[] resolved = GenericsUtils.parseClassNodesFromString(
typeString,
getSourceUnit(),
typeCheckingContext.getCompilationUnit(),
mn,
type
);
if (resolved != null) {
if (resolved.length == 1) {
resolveGenericsFromTypeHint(receiver, arguments, mn, resolved);
expression.putNodeMetaData(DELEGATION_METADATA, newDelegationMetadata(resolved[0], stInt));
} else {
addStaticTypeError("Incorrect type hint found in method " + (mn), type);
}
}
} else {
List<Expression> expressions = arguments.getExpressions();
int expressionsSize = expressions.size();
Expression parameter = annotation.getMember("target");
String parameterName = parameter instanceof ConstantExpression ? parameter.getText() : "";
// todo: handle vargs!
for (int j = 0, paramsLength = params.length; j < paramsLength; j++) {
Parameter methodParam = params[j];
List<AnnotationNode> targets = methodParam.getAnnotations(DELEGATES_TO_TARGET);
if (targets != null && targets.size() == 1) {
AnnotationNode targetAnnotation = targets.get(0); // @DelegatesTo.Target Obj foo
Expression idMember = targetAnnotation.getMember("value");
String id = idMember instanceof ConstantExpression ? idMember.getText() : "";
if (id.equals(parameterName)) {
if (j < expressionsSize) {
Expression actualArgument = expressions.get(j);
ClassNode actualType = getType(actualArgument);
if (genericTypeIndex instanceof ConstantExpression) {
int gti = Integer.parseInt(genericTypeIndex.getText());
ClassNode paramType = methodParam.getType(); // type annotated with @DelegatesTo.Target
GenericsType[] genericsTypes = paramType.getGenericsTypes();
if (genericsTypes == null) {
addStaticTypeError("Cannot use @DelegatesTo(genericTypeIndex=" + genericTypeIndex.getText()
+ ") with a type that doesn't use generics", methodParam);
} else if (gti < 0 || gti >= genericsTypes.length) {
addStaticTypeError("Index of generic type @DelegatesTo(genericTypeIndex=" + genericTypeIndex.getText()
+ ") " + (gti < 0 ? "lower" : "greater") + " than those of the selected type", methodParam);
} else {
ClassNode pType = GenericsUtils.parameterizeType(actualType, paramType);
GenericsType[] pTypeGenerics = pType.getGenericsTypes();
if (pTypeGenerics != null && pTypeGenerics.length > gti) {
actualType = pTypeGenerics[gti].getType();
} else {
addStaticTypeError("Unable to map actual type [" + prettyPrintType(actualType) + "] onto " + prettyPrintType(paramType), methodParam);
}
}
}
expression.putNodeMetaData(DELEGATION_METADATA, newDelegationMetadata(actualType, stInt));
break;
}
}
}
}
if (expression.getNodeMetaData(DELEGATION_METADATA) == null) {
addError("Not enough arguments found for a @DelegatesTo method call. Please check that you either use an explicit class or @DelegatesTo.Target with a correct id", annotation);
}
}
}
}
}
protected void addReceivers(final List<Receiver<String>> receivers, final Collection<Receiver<String>> owners, final boolean implicitThis) {
if (!implicitThis || typeCheckingContext.delegationMetadata == null) {
receivers.addAll(owners);
} else {
addReceivers(receivers, owners, typeCheckingContext.delegationMetadata, "");
}
}
private static void addReceivers(final List<Receiver<String>> receivers, final Collection<Receiver<String>> owners, final DelegationMetadata dmd, final String path) {
int strategy = dmd.getStrategy();
switch (strategy) {
case Closure.DELEGATE_ONLY:
case Closure.DELEGATE_FIRST:
addDelegateReceiver(receivers, dmd.getType(), path + "delegate");
if (strategy == Closure.DELEGATE_FIRST) {
if (dmd.getParent() == null) {
receivers.addAll(owners);
} else {
//receivers.add(new Receiver<String>(CLOSURE_TYPE, path + "owner"));
addReceivers(receivers, owners, dmd.getParent(), path + "owner.");
}
}
break;
case Closure.OWNER_ONLY:
case Closure.OWNER_FIRST:
if (dmd.getParent() == null) {
receivers.addAll(owners);
} else {
//receivers.add(new Receiver<String>(CLOSURE_TYPE, path + "owner"));
addReceivers(receivers, owners, dmd.getParent(), path + "owner.");
}
if (strategy == Closure.OWNER_FIRST) {
addDelegateReceiver(receivers, dmd.getType(), path + "delegate");
}
break;
}
}
private static void addDelegateReceiver(final List<Receiver<String>> receivers, final ClassNode delegate, final String path) {
if (receivers.stream().map(Receiver::getType).noneMatch(delegate::equals)) {
receivers.add(new Receiver<>(delegate, path));
}
}
@Override
public void visitMethodCallExpression(final MethodCallExpression call) {
String name = call.getMethodAsString();
if (name == null) {
addStaticTypeError("Cannot resolve dynamic method name at compile time", call.getMethod());
return;
}
if (extension.beforeMethodCall(call)) {
extension.afterMethodCall(call);
return;
}
typeCheckingContext.pushEnclosingMethodCall(call);
Expression objectExpression = call.getObjectExpression();
objectExpression.visit(this);
call.getMethod().visit(this);
ClassNode receiver = getType(objectExpression);
if (objectExpression instanceof ConstructorCallExpression) { // GROOVY-10228
inferDiamondType((ConstructorCallExpression) objectExpression, receiver.getPlainNodeReference());
}
if (call.isSpreadSafe()) {
ClassNode componentType = inferComponentType(receiver, null);
if (componentType == null) {
addStaticTypeError("Spread-dot operator can only be used on iterable types", objectExpression);
} else {
MethodCallExpression subcall = callX(varX("item", componentType), name, call.getArguments());
subcall.setLineNumber(call.getLineNumber()); subcall.setColumnNumber(call.getColumnNumber());
subcall.setImplicitThis(call.isImplicitThis());
visitMethodCallExpression(subcall);
// inferred type should be a list of what sub-call returns
storeType(call, extension.buildListType(getType(subcall)));
storeTargetMethod(call, subcall.getNodeMetaData(DIRECT_METHOD_CALL_TARGET));
}
typeCheckingContext.popEnclosingMethodCall();
return;
}
Expression callArguments = call.getArguments();
ArgumentListExpression argumentList = InvocationWriter.makeArgumentList(callArguments);
// visit closures *after* the method has been chosen
visitMethodCallArguments(receiver, argumentList, false, null);
boolean isThisObjectExpression = isThisExpression(objectExpression);
boolean isCallOnClosure = false;
FieldNode fieldNode = null;
switch (name) {
case "call":
case "doCall":
if (!isThisObjectExpression) {
isCallOnClosure = receiver.equals(CLOSURE_TYPE);
break;
}
default:
if (isThisObjectExpression) {
ClassNode enclosingType = typeCheckingContext.getEnclosingClassNode();
fieldNode = enclosingType.getDeclaredField(name);
if (fieldNode != null && getType(fieldNode).equals(CLOSURE_TYPE)
&& !enclosingType.hasPossibleMethod(name, callArguments)) {
isCallOnClosure = true;
}
}
}
try {
ClassNode[] args = getArgumentTypes(argumentList);
boolean callArgsVisited = false;
if (isCallOnClosure) {
if (fieldNode != null) {
GenericsType[] genericsTypes = getType(fieldNode).getGenericsTypes();
if (genericsTypes != null) {
Parameter[] parameters = fieldNode.getNodeMetaData(CLOSURE_ARGUMENTS);
if (parameters != null) {
typeCheckClosureCall(callArguments, args, parameters);
}
ClassNode closureReturnType = genericsTypes[0].getType();
storeType(call, closureReturnType);
}
} else if (objectExpression instanceof VariableExpression) {
Variable variable = findTargetVariable((VariableExpression) objectExpression);
if (variable instanceof ASTNode) {
Parameter[] parameters = ((ASTNode) variable).getNodeMetaData(CLOSURE_ARGUMENTS);
if (parameters != null) {
checkForbiddenSpreadArgument(argumentList, parameters);
typeCheckClosureCall(callArguments, args, parameters);
}
ClassNode type = getType((ASTNode) variable);
if (type.equals(CLOSURE_TYPE)) { // GROOVY-10098, et al.
GenericsType[] genericsTypes = type.getGenericsTypes();
if (genericsTypes != null && genericsTypes.length == 1
&& genericsTypes[0].getLowerBound() == null) {
type = genericsTypes[0].getType();
} else {
type = OBJECT_TYPE;
}
}
if (type != null) {
storeType(call, type);
}
}
} else if (objectExpression instanceof ClosureExpression) {
// we can get actual parameters directly
Parameter[] parameters = ((ClosureExpression) objectExpression).getParameters();
if (parameters != null) {
typeCheckClosureCall(callArguments, args, parameters);
}
ClassNode type = getInferredReturnType(objectExpression);
if (type != null) {
storeType(call, type);
}
}
List<Expression> list = argumentList.getExpressions();
int nArgs = list.stream().noneMatch(e -> e instanceof SpreadExpression) ? list.size() : Integer.MAX_VALUE;
storeTargetMethod(call, nArgs == 0 ? CLOSURE_CALL_NO_ARG : nArgs == 1 ? CLOSURE_CALL_ONE_ARG : CLOSURE_CALL_VARGS);
} else {
// method call receivers are :
// - possible "with" receivers
// - the actual receiver as found in the method call expression
// - any of the potential receivers found in the instanceof temporary table
// in that order
List<Receiver<String>> receivers = new ArrayList<>();
addReceivers(receivers, makeOwnerList(objectExpression), call.isImplicitThis());
List<MethodNode> mn = null;
Receiver<String> chosenReceiver = null;
for (Receiver<String> currentReceiver : receivers) {
ClassNode receiverType = currentReceiver.getType();
mn = findMethod(receiverType, name, args);
// if receiver is "this" in a static context then only static methods are compatible
// if not in a static context but the current receiver is a static class ensure that
// all methods are either static or declared by the current receiver or a superclass
if (!mn.isEmpty() && currentReceiver.getData() == null && (isThisObjectExpression || call.isImplicitThis())
&& (typeCheckingContext.isInStaticContext || (receiverType.getModifiers() & Opcodes.ACC_STATIC) != 0)) {
// we create separate method lists just to be able to print out
// a nice error message to the user
// a method is accessible if it is static, or if we are not in a static context and it is
// declared by the current receiver or a superclass
List<MethodNode> accessibleMethods = new LinkedList<>();
List<MethodNode> inaccessibleMethods = new LinkedList<>();
for (final MethodNode node : mn) {
if (node.isStatic() || (!typeCheckingContext.isInStaticContext
&& implementsInterfaceOrIsSubclassOf(receiverType, node.getDeclaringClass()))) {
accessibleMethods.add(node);
} else {
inaccessibleMethods.add(node);
}
}
mn = accessibleMethods;
if (accessibleMethods.isEmpty()) {
MethodNode node = inaccessibleMethods.get(0); // choose an arbitrary method to display an error message
addStaticTypeError("Non-static method " + prettyPrintTypeName(node.getDeclaringClass()) + "#" + node.getName() + " cannot be called from static context", call);
}
}
if (!mn.isEmpty()) {
chosenReceiver = currentReceiver;
break;
}
}
if (mn.isEmpty() && isThisObjectExpression && call.isImplicitThis() && typeCheckingContext.getEnclosingClosure() != null) {
mn = CLOSURE_TYPE.getDeclaredMethods(name);
if (!mn.isEmpty()) {
chosenReceiver = Receiver.make(CLOSURE_TYPE);
objectExpression.removeNodeMetaData(INFERRED_TYPE);
}
}
if (mn.isEmpty()) {
mn = extension.handleMissingMethod(receiver, name, argumentList, args, call);
}
if (mn.isEmpty()) {
addNoMatchingMethodError(receiver, name, args, call);
} else {
if (areCategoryMethodCalls(mn, name, args)) {
addCategoryMethodCallError(call);
}
{
ClassNode obj = chosenReceiver != null ? chosenReceiver.getType() : null;
if (mn.size() > 1 && obj instanceof UnionTypeClassNode) { // GROOVY-8965: support duck-typing using dynamic resolution
ClassNode returnType = mn.stream().map(MethodNode::getReturnType).reduce(WideningCategories::lowestUpperBound).get();
call.putNodeMetaData(DYNAMIC_RESOLUTION, returnType);
MethodNode tmp = new MethodNode(name, 0, returnType, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null);
tmp.setDeclaringClass(obj); // for storeTargetMethod
mn = Collections.singletonList(tmp);
} else {
mn = disambiguateMethods(mn, obj, args, call);
}
}
if (mn.size() == 1) {
MethodNode targetMethodCandidate = mn.get(0);
ClassNode declaringClass = targetMethodCandidate.getDeclaringClass();
if (!targetMethodCandidate.isStatic() && !isClassType(declaringClass)
&& objectExpression instanceof ClassExpression && call.getNodeMetaData(DYNAMIC_RESOLUTION) == null) {
addStaticTypeError("Non-static method " + prettyPrintTypeName(declaringClass) + "#" + targetMethodCandidate.getName() + " cannot be called from static context", call);
} else if (targetMethodCandidate.isAbstract() && isSuperExpression(objectExpression)) { // GROOVY-10341
String target = toMethodParametersString(targetMethodCandidate.getName(), extractTypesFromParameters(targetMethodCandidate.getParameters()));
if (Traits.hasDefaultImplementation(targetMethodCandidate)) { // GROOVY-10494
addStaticTypeError("Default method " + target + " requires qualified super", call);
} else {
addStaticTypeError("Abstract method " + target + " cannot be called directly", call);
}
}
if (chosenReceiver == null) {
chosenReceiver = Receiver.make(declaringClass);
}
// note second pass here to differentiate from extension that sets type
boolean mergeType = (call.getNodeMetaData(INFERRED_TYPE) != null);
storeTargetMethod(call, targetMethodCandidate);
visitMethodCallArguments(chosenReceiver.getType(), argumentList, true, targetMethodCandidate); callArgsVisited = true;
ClassNode returnType = getType(targetMethodCandidate);
if (isUsingGenericsOrIsArrayUsingGenerics(returnType)) {
ClassNode irtg = inferReturnTypeGenerics(chosenReceiver.getType(), targetMethodCandidate, callArguments, call.getGenericsTypes());
if (irtg != null && implementsInterfaceOrIsSubclassOf(irtg, returnType))
returnType = irtg;
}
// GROOVY-6091: use of "delegate" or "getDelegate()" does not make use of @DelegatesTo metadata
if (targetMethodCandidate == GET_DELEGATE && typeCheckingContext.getEnclosingClosure() != null) {
DelegationMetadata md = getDelegationMetadata(typeCheckingContext.getEnclosingClosure().getClosureExpression());
if (md != null) {
returnType = md.getType();
} else {
returnType = typeCheckingContext.getEnclosingClassNode();
}
}
// GROOVY-7106, GROOVY-7274, GROOVY-8909, GROOVY-8961, GROOVY-9734, GROOVY-9844, GROOVY-9915, et al.
Parameter[] parameters = targetMethodCandidate.getParameters();
if (chosenReceiver.getType().getGenericsTypes() != null && !targetMethodCandidate.isStatic() && !(targetMethodCandidate instanceof ExtensionMethodNode)) {
Map<GenericsTypeName, GenericsType> context = extractPlaceHoldersVisibleToDeclaration(chosenReceiver.getType(), targetMethodCandidate, argumentList);
parameters = Arrays.stream(parameters).map(p -> new Parameter(applyGenericsContext(context, p.getType()), p.getName())).toArray(Parameter[]::new);
}
resolvePlaceholdersFromImplicitTypeHints(args, argumentList, parameters);
if (typeCheckMethodsWithGenericsOrFail(chosenReceiver.getType(), args, targetMethodCandidate, call)) {
String data = chosenReceiver.getData();
if (data != null) {
// the method which has been chosen is supposed to be a call on delegate or owner
// so we store the information so that the static compiler may reuse it
call.putNodeMetaData(IMPLICIT_RECEIVER, data);
}
receiver = chosenReceiver.getType();
if (mergeType || call.getNodeMetaData(INFERRED_TYPE) == null)
storeType(call, adjustWithTraits(targetMethodCandidate, receiver, args, returnType));
if (objectExpression instanceof VariableExpression && ((VariableExpression) objectExpression).isClosureSharedVariable()) {
// if the object expression is a closure shared variable, we will have to perform a second pass
typeCheckingContext.secondPassExpressions.add(new SecondPassExpression<>(call, args));
}
} else {
call.removeNodeMetaData(DIRECT_METHOD_CALL_TARGET);
}
} else {
addAmbiguousErrorMessage(mn, name, args, call);
}
}
}
// adjust typing for explicit math methods which have special handling; operator variants handled elsewhere
if (args.length == 1 && isNumberType(args[0]) && isNumberType(receiver) && NUMBER_OPS.containsKey(name)) {
ClassNode resultType = getMathResultType(NUMBER_OPS.get(name), receiver, args[0], name);
if (resultType != null) {
storeType(call, resultType);
}
}
MethodNode target = call.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
if (!callArgsVisited) {
visitMethodCallArguments(receiver, argumentList, true, target);
}
if (target != null) { Parameter[] params = target.getParameters();
checkClosureMetadata(argumentList.getExpressions(), params);
checkForbiddenSpreadArgument(argumentList, params);
} else {
checkForbiddenSpreadArgument(argumentList);
}
} finally {
typeCheckingContext.popEnclosingMethodCall();
extension.afterMethodCall(call);
}
}
private void checkClosureMetadata(final List<Expression> arguments, final Parameter[] parameters) {
// TODO: Check additional delegation metadata like type (see checkClosureWithDelegatesTo).
for (int i = 0, n = Math.min(arguments.size(), parameters.length); i < n; i += 1) {
Expression argument = arguments.get(i);
ClassNode aType = getType(argument), pType = parameters[i].getType();
// GROOVY-7996: check delegation metadata of closure parameter used as method call argument
if (CLOSURE_TYPE.equals(aType) && CLOSURE_TYPE.equals(pType) && argument instanceof VariableExpression && ((VariableExpression) argument).getAccessedVariable() instanceof Parameter) {
int incomingStrategy = getResolveStrategy((Parameter) ((VariableExpression) argument).getAccessedVariable());
int outgoingStrategy = getResolveStrategy(parameters[i]);
if (incomingStrategy != outgoingStrategy) {
addStaticTypeError("Closure parameter with resolve strategy " + getResolveStrategyName(incomingStrategy) + " passed to method with resolve strategy " + getResolveStrategyName(outgoingStrategy), argument);
}
}
}
}
private int getResolveStrategy(final Parameter parameter) {
List<AnnotationNode> annotations = parameter.getAnnotations(DELEGATES_TO);
if (annotations != null && !annotations.isEmpty()) {
Expression strategy = annotations.get(0).getMember("strategy");
if (strategy != null) {
return (Integer) evaluateExpression(castX(Integer_TYPE, strategy), getSourceUnit().getConfiguration());
}
}
return Closure.OWNER_FIRST;
}
private void inferMethodReferenceType(final ClassNode receiver, final ArgumentListExpression argumentList, final MethodNode selectedMethod) {
if (receiver == null) return;
if (argumentList == null) return;
if (selectedMethod == null) return;
List<Expression> argumentExpressions = argumentList.getExpressions();
if (argumentExpressions == null || argumentExpressions.stream()
.noneMatch(e -> e instanceof MethodReferenceExpression)) {
return;
}
Parameter[] parameters = selectedMethod.getParameters();
final int nthParameter = parameters.length - 1;
List<Integer> methodReferencePositions = new LinkedList<>();
List<Expression> newArgumentExpressions = new LinkedList<>();
for (int i = 0, n = argumentExpressions.size(); i < n; i += 1) {
Expression argumentExpression = argumentExpressions.get(i);
if (!(argumentExpression instanceof MethodReferenceExpression)) {
newArgumentExpressions.add(argumentExpression);
} else {
Parameter param = parameters[Math.min(i, nthParameter)]; // GROOVY-10336
ClassNode paramType = param.getType();
if (i >= nthParameter && paramType.isArray())
paramType = paramType.getComponentType();
if (!isFunctionalInterface(paramType.redirect())) {
addError("The argument is a method reference, but the parameter type is not a functional interface", argumentExpression);
newArgumentExpressions.add(argumentExpression);
} else {
methodReferencePositions.add(i);
newArgumentExpressions.add(constructLambdaExpressionForMethodReference(paramType));
}
}
}
if (methodReferencePositions.isEmpty()) return; // GROOVY-10269
visitMethodCallArguments(receiver, args(newArgumentExpressions), true, selectedMethod);
for (int index : methodReferencePositions) {
Expression lambdaExpression = newArgumentExpressions.get(index);
Expression methodReferenceExpression = argumentExpressions.get(index);
methodReferenceExpression.putNodeMetaData(CLOSURE_ARGUMENTS, lambdaExpression.getNodeMetaData(CLOSURE_ARGUMENTS));
}
}
private LambdaExpression constructLambdaExpressionForMethodReference(final ClassNode functionalInterfaceType) {
Parameter[] parameters = findSAM(functionalInterfaceType).getParameters().clone();
for (int i = 0, n = parameters.length; i < n; i += 1) {
parameters[i] = new Parameter(dynamicType(), "p" + System.nanoTime());
}
return new LambdaExpression(parameters, EmptyStatement.INSTANCE);
}
/**
* A special method handling the "withTrait" call for which the type checker knows more than
* what the type signature is able to tell. If "withTrait" is detected, then a new class node
* is created representing the list of trait interfaces.
*
* @param directMethodCallCandidate a method selected by the type checker
* @param receiver the receiver of the method call
* @param args the arguments of the method call
* @param returnType the original return type, as inferred by the type checker
* @return fixed return type if the selected method is {@link org.codehaus.groovy.runtime.DefaultGroovyMethods#withTraits(Object, Class[]) withTraits}
*/
private static ClassNode adjustWithTraits(final MethodNode directMethodCallCandidate, final ClassNode receiver, final ClassNode[] args, final ClassNode returnType) {
if (directMethodCallCandidate instanceof ExtensionMethodNode) {
ExtensionMethodNode emn = (ExtensionMethodNode) directMethodCallCandidate;
if ("withTraits".equals(emn.getName()) && "DefaultGroovyMethods".equals(emn.getExtensionMethodNode().getDeclaringClass().getNameWithoutPackage())) {
List<ClassNode> nodes = new LinkedList<>();
Collections.addAll(nodes, receiver.getInterfaces());
for (ClassNode arg : args) {
if (isClassClassNodeWrappingConcreteType(arg)) {
nodes.add(arg.getGenericsTypes()[0].getType());
} else {
nodes.add(arg);
}
}
return new WideningCategories.LowestUpperBoundClassNode(returnType.getName() + "Composed", OBJECT_TYPE, nodes.toArray(ClassNode.EMPTY_ARRAY));
}
}
return returnType;
}
/**
* Adds various getAt and setAt methods for primitive arrays.
*
* @param receiver the receiver class
* @param name the name of the method
* @param args the argument classes
*/
private static void addArrayMethods(final List<MethodNode> methods, final ClassNode receiver, final String name, final ClassNode[] args) {
if (args.length != 1) return;
if (!receiver.isArray()) return;
if (!isIntCategory(getUnwrapper(args[0]))) return;
if ("getAt".equals(name)) {
MethodNode node = new MethodNode(name, Opcodes.ACC_PUBLIC, receiver.getComponentType(), new Parameter[]{new Parameter(args[0], "arg")}, null, null);
node.setDeclaringClass(receiver.redirect());
methods.add(node);
} else if ("setAt".equals(name)) {
MethodNode node = new MethodNode(name, Opcodes.ACC_PUBLIC, VOID_TYPE, new Parameter[]{new Parameter(args[0], "arg")}, null, null);
node.setDeclaringClass(receiver.redirect());
methods.add(node);
}
}
/**
* In the case of a <em>Object.with { ... }</em> call, this method is supposed to retrieve
* the inferred closure return type.
*
* @param callArguments the argument list from the <em>Object#with(Closure)</em> call, ie. a single closure expression
* @return the inferred closure return type or <em>null</em>
*/
protected ClassNode getInferredReturnTypeFromWithClosureArgument(final Expression callArguments) {
if (!(callArguments instanceof ArgumentListExpression)) return null;
ArgumentListExpression argList = (ArgumentListExpression) callArguments;
ClosureExpression closure = (ClosureExpression) argList.getExpression(0);
visitClosureExpression(closure);
return getInferredReturnType(closure);
}
/**
* Given an object expression (a message receiver expression), generate list
* of possible types.
*
* @param objectExpression the receiver expression
* @return the list of types the receiver may be
*/
protected List<Receiver<String>> makeOwnerList(final Expression objectExpression) {
ClassNode receiver = getType(objectExpression);
List<Receiver<String>> owners = new ArrayList<>();
if (typeCheckingContext.delegationMetadata != null
&& objectExpression instanceof VariableExpression
&& ((Variable) objectExpression).getName().equals("owner")
&& /*isNested:*/typeCheckingContext.delegationMetadata.getParent() != null) {
List<Receiver<String>> enclosingClass = Collections.singletonList(
Receiver.make(typeCheckingContext.getEnclosingClassNode()));
addReceivers(owners, enclosingClass, typeCheckingContext.delegationMetadata.getParent(), "owner.");
} else {
List<ClassNode> temporaryTypes = getTemporaryTypesForExpression(objectExpression);
int temporaryTypesCount = (temporaryTypes != null ? temporaryTypes.size() : 0);
if (temporaryTypesCount > 0) { // GROOVY-8965, GROOVY-10180, GROOVY-10668
owners.add(Receiver.make(lowestUpperBound(temporaryTypes)));
}
if (typeCheckingContext.lastImplicitItType != null
&& objectExpression instanceof VariableExpression
&& ((Variable) objectExpression).getName().equals("it")) {
owners.add(Receiver.make(typeCheckingContext.lastImplicitItType));
}
if (isClassClassNodeWrappingConcreteType(receiver)) {
ClassNode staticType = receiver.getGenericsTypes()[0].getType();
owners.add(Receiver.make(staticType)); // Type from Class<Type>
addTraitType(staticType, owners); // T in Class<T$Trait$Helper>
owners.add(Receiver.make(receiver)); // Class<Type>
} else {
addBoundType(receiver, owners);
addSelfTypes(receiver, owners);
addTraitType(receiver, owners);
if (receiver.redirect().isInterface()) {
owners.add(Receiver.make(OBJECT_TYPE));
} else if (isSuperExpression(objectExpression)) { //GROOVY-9909: super.defaultMethod()
for (ClassNode in : typeCheckingContext.getEnclosingClassNode().getInterfaces()) {
if (!receiver.implementsInterface(in)) owners.add(Receiver.make(in));
}
}
}
if (temporaryTypesCount > 1 && !(objectExpression instanceof VariableExpression)) {
owners.add(Receiver.make(new UnionTypeClassNode(temporaryTypes.toArray(ClassNode.EMPTY_ARRAY))));
}
}
return owners;
}
private static void addBoundType(final ClassNode receiver, final List<Receiver<String>> owners) {
if (!receiver.isGenericsPlaceHolder() || receiver.getGenericsTypes() == null) {
owners.add(Receiver.make(receiver));
return;
}
GenericsType gt = receiver.getGenericsTypes()[0];
if (gt.getLowerBound() == null && gt.getUpperBounds() != null) {
for (ClassNode cn : gt.getUpperBounds()) { // T extends C & I
addBoundType(cn, owners);
addSelfTypes(cn, owners);
}
} else {
owners.add(Receiver.make(OBJECT_TYPE)); // T or T super Type
}
}
private static void addSelfTypes(final ClassNode receiver, final List<Receiver<String>> owners) {
for (ClassNode selfType : Traits.collectSelfTypes(receiver, new LinkedHashSet<>())) {
owners.add(Receiver.make(selfType));
}
}
private static void addTraitType(final ClassNode receiver, final List<Receiver<String>> owners) {
if (Traits.isTrait(receiver.getOuterClass()) && receiver.getName().endsWith("$Helper")) {
ClassNode traitType = receiver.getOuterClass();
owners.add(Receiver.make(traitType));
addSelfTypes(traitType, owners);
}
}
private void checkForbiddenSpreadArgument(final ArgumentListExpression arguments, final Parameter[] parameters) {
if (!isVargs(parameters)) {
checkForbiddenSpreadArgument(arguments);
} else { // GROOVY-10597: allow spread for the ... param
List<Expression> list = arguments.getExpressions();
list = list.subList(0, parameters.length - 1);
checkForbiddenSpreadArgument(args(list));
}
}
protected void checkForbiddenSpreadArgument(final ArgumentListExpression arguments) {
for (Expression argument : arguments) {
if (argument instanceof SpreadExpression) {
addStaticTypeError("The spread operator cannot be used as argument of method or closure calls with static type checking because the number of arguments cannot be determined at compile time", argument);
}
}
}
protected List<ClassNode> getTemporaryTypesForExpression(final Expression objectExpression) {
List<ClassNode> classNodes = null;
int depth = typeCheckingContext.temporaryIfBranchTypeInformation.size();
while (classNodes == null && depth > 0) {
Map<Object, List<ClassNode>> tempo = typeCheckingContext.temporaryIfBranchTypeInformation.get(--depth);
Object key = objectExpression instanceof ParameterVariableExpression
? ((ParameterVariableExpression) objectExpression).parameter
: extractTemporaryTypeInfoKey(objectExpression);
classNodes = tempo.get(key);
}
return classNodes;
}
protected void storeTargetMethod(final Expression call, final MethodNode target) {
if (target == null) {
call.removeNodeMetaData(DIRECT_METHOD_CALL_TARGET); return;
}
call.putNodeMetaData(DIRECT_METHOD_CALL_TARGET,target);
checkInterfaceStaticCall(call, target);
checkOrMarkPrivateAccess(call, target);
checkSuperCallFromClosure(call, target);
extension.onMethodSelection(call, target);
}
private void checkInterfaceStaticCall(final Expression call, final MethodNode target) {
if (target instanceof ExtensionMethodNode) return;
ClassNode declaringClass = target.getDeclaringClass();
if (declaringClass.isInterface() && target.isStatic()) {
Expression objectExpression = getObjectExpression(call);
if (objectExpression != null) { ClassNode type = getType(objectExpression);
if (!isClassClassNodeWrappingConcreteType(type) || !type.getGenericsTypes()[0].getType().equals(declaringClass)) {
addStaticTypeError("static method of interface " + prettyPrintTypeName(declaringClass) + " can only be accessed with class qualifier", call);
}
}
}
}
private void checkSuperCallFromClosure(final Expression call, final MethodNode target) {
if (isSuperExpression(getObjectExpression(call)) && typeCheckingContext.getEnclosingClosure() != null) {
ClassNode current = typeCheckingContext.getEnclosingClassNode();
current.getNodeMetaData(SUPER_MOP_METHOD_REQUIRED, x -> new LinkedList<>()).add(target);
call.putNodeMetaData(SUPER_MOP_METHOD_REQUIRED, current);
}
}
private static Expression getObjectExpression(final Expression expression) {
if (expression instanceof MethodCallExpression) {
return ((MethodCallExpression) expression).getObjectExpression();
}
if (expression instanceof PropertyExpression) {
return ((PropertyExpression) expression).getObjectExpression();
}
/*if (expression instanceof MethodPointerExpression) {
return ((MethodPointerExpression) expression).getExpression();
}*/
return null;
}
protected void typeCheckClosureCall(final Expression arguments, final ClassNode[] argumentTypes, final Parameter[] parameters) {
if (allParametersAndArgumentsMatchWithDefaultParams(parameters, argumentTypes) < 0 && lastArgMatchesVarg(parameters, argumentTypes) < 0) {
addStaticTypeError("Cannot call closure that accepts " + formatArgumentList(extractTypesFromParameters(parameters)) + " with " + formatArgumentList(argumentTypes), arguments);
}
}
@Override
public void visitIfElse(final IfStatement ifElse) {
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
try {
// create a new temporary element in the if-then-else type info
typeCheckingContext.pushTemporaryTypeInfo();
visitStatement(ifElse);
ifElse.getBooleanExpression().visit(this);
ifElse.getIfBlock().visit(this);
// pop if-then-else temporary type info
typeCheckingContext.popTemporaryTypeInfo();
// GROOVY-6099: restore assignment info as before the if branch
restoreTypeBeforeConditional();
ifElse.getElseBlock().visit(this);
// GROOVY-9786: if chaining: "if (...) x=?; else if (...) x=?;"
Map<VariableExpression, ClassNode> updates =
ifElse.getElseBlock().getNodeMetaData("assignments");
if (updates != null) {
updates.forEach(this::recordAssignment);
}
} finally {
ifElse.putNodeMetaData("assignments", popAssignmentTracking(oldTracker));
}
if (!typeCheckingContext.enclosingBlocks.isEmpty()) {
BinaryExpression instanceOfExpression = findInstanceOfNotReturnExpression(ifElse);
if (instanceOfExpression == null) {
instanceOfExpression = findNotInstanceOfReturnExpression(ifElse);
}
if (instanceOfExpression != null) {
visitInstanceofNot(instanceOfExpression);
}
}
}
protected void visitInstanceofNot(final BinaryExpression be) {
BlockStatement currentBlock = typeCheckingContext.enclosingBlocks.getFirst();
assert currentBlock != null;
if (typeCheckingContext.blockStatements2Types.containsKey(currentBlock)) {
// another instanceOf_not was before, no need store vars
} else {
// saving type of variables to restoring them after returning from block
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
getTypeCheckingContext().pushTemporaryTypeInfo();
typeCheckingContext.blockStatements2Types.put(currentBlock, oldTracker);
}
pushInstanceOfTypeInfo(be.getLeftExpression(), be.getRightExpression());
}
@Override
public void visitBlockStatement(final BlockStatement block) {
if (block != null) {
typeCheckingContext.enclosingBlocks.addFirst(block);
}
super.visitBlockStatement(block);
if (block != null) {
visitClosingBlock(block);
}
}
public void visitClosingBlock(final BlockStatement block) {
BlockStatement peekBlock = typeCheckingContext.enclosingBlocks.removeFirst();
boolean found = typeCheckingContext.blockStatements2Types.containsKey(peekBlock);
if (found) {
Map<VariableExpression, List<ClassNode>> oldTracker = typeCheckingContext.blockStatements2Types.remove(peekBlock);
getTypeCheckingContext().popTemporaryTypeInfo();
popAssignmentTracking(oldTracker);
}
}
/**
* Check IfStatement matched pattern :
* Object var1;
* if (!(var1 instanceOf Runnable)) {
* return
* }
* // Here var1 instance of Runnable
* <p>
* Return expression , which contains instanceOf (without not)
* Return null, if not found
*/
protected BinaryExpression findInstanceOfNotReturnExpression(final IfStatement ifElse) {
Statement elseBlock = ifElse.getElseBlock();
if (!(elseBlock instanceof EmptyStatement)) {
return null;
}
Expression conditionExpression = ifElse.getBooleanExpression().getExpression();
if (!(conditionExpression instanceof NotExpression)) {
return null;
}
NotExpression notExpression = (NotExpression) conditionExpression;
Expression expression = notExpression.getExpression();
if (!(expression instanceof BinaryExpression)) {
return null;
}
BinaryExpression instanceOfExpression = (BinaryExpression) expression;
int op = instanceOfExpression.getOperation().getType();
if (op != KEYWORD_INSTANCEOF) {
return null;
}
if (notReturningBlock(ifElse.getIfBlock())) {
return null;
}
return instanceOfExpression;
}
/**
* Check IfStatement matched pattern :
* Object var1;
* if (var1 !instanceOf Runnable) {
* return
* }
* // Here var1 instance of Runnable
* <p>
* Return expression , which contains instanceOf (without not)
* Return null, if not found
*/
protected BinaryExpression findNotInstanceOfReturnExpression(final IfStatement ifElse) {
Statement elseBlock = ifElse.getElseBlock();
if (!(elseBlock instanceof EmptyStatement)) {
return null;
}
Expression conditionExpression = ifElse.getBooleanExpression().getExpression();
if (!(conditionExpression instanceof BinaryExpression)) {
return null;
}
BinaryExpression instanceOfExpression = (BinaryExpression) conditionExpression;
int op = instanceOfExpression.getOperation().getType();
if (op != COMPARE_NOT_INSTANCEOF) {
return null;
}
if (notReturningBlock(ifElse.getIfBlock())) {
return null;
}
return instanceOfExpression;
}
private static boolean notReturningBlock(final Statement statement) {
return statement.isEmpty() || !(statement instanceof BlockStatement)
|| !(last(((BlockStatement) statement).getStatements()) instanceof ReturnStatement);
}
@Override
public void visitSwitch(final SwitchStatement statement) {
typeCheckingContext.pushEnclosingSwitchStatement(statement);
try {
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
try {
super.visitSwitch(statement);
} finally {
popAssignmentTracking(oldTracker);
}
} finally {
typeCheckingContext.popEnclosingSwitchStatement();
}
}
@Override
protected void afterSwitchConditionExpressionVisited(final SwitchStatement statement) {
Expression conditionExpression = statement.getExpression();
conditionExpression.putNodeMetaData(TYPE, getType(conditionExpression));
}
@Override
public void visitCaseStatement(final CaseStatement statement) {
Expression expression = statement.getExpression();
if (expression instanceof ClosureExpression) { // GROOVY-9854: propagate the switch type
SwitchStatement switchStatement = typeCheckingContext.getEnclosingSwitchStatement();
ClassNode inf = switchStatement.getExpression().getNodeMetaData(TYPE);
expression.putNodeMetaData(CLOSURE_ARGUMENTS, new ClassNode[]{inf});
Parameter[] params = ((ClosureExpression) expression).getParameters();
if (params != null && params.length == 1) {
boolean lambda = (expression instanceof LambdaExpression);
checkParamType(params[0], wrapTypeIfNecessary(inf), false, lambda);
} else if (params == null || params.length > 1) {
int paramCount = (params != null ? params.length : 0);
addError("Incorrect number of parameters. Expected 1 but found " + paramCount, expression);
}
}
super.visitCaseStatement(statement);
restoreTypeBeforeConditional();
}
private void recordAssignment(final VariableExpression lhsExpr, final ClassNode rhsType) {
typeCheckingContext.ifElseForWhileAssignmentTracker.computeIfAbsent(lhsExpr, lhs -> {
ClassNode lhsType = lhs.getNodeMetaData(INFERRED_TYPE);
List<ClassNode> types = new ArrayList<>(2);
types.add(lhsType);
return types;
}).add(rhsType);
}
private void restoreTypeBeforeConditional() {
typeCheckingContext.ifElseForWhileAssignmentTracker.forEach((var, types) -> {
var.putNodeMetaData(INFERRED_TYPE, types.get(0));
});
}
protected Map<VariableExpression, ClassNode> popAssignmentTracking(final Map<VariableExpression, List<ClassNode>> oldTracker) {
Map<VariableExpression, ClassNode> assignments = new HashMap<>();
typeCheckingContext.ifElseForWhileAssignmentTracker.forEach((var, types) -> {
types.stream().filter(t -> t != null && t != UNKNOWN_PARAMETER_TYPE) // GROOVY-6099, GROOVY-10294
.reduce(WideningCategories::lowestUpperBound).ifPresent(type -> {
assignments.put(var, type);
storeType(var, type);
});
});
typeCheckingContext.ifElseForWhileAssignmentTracker = oldTracker;
return assignments;
}
protected Map<VariableExpression, List<ClassNode>> pushAssignmentTracking() {
// memorize current assignment context
Map<VariableExpression, List<ClassNode>> oldTracker = typeCheckingContext.ifElseForWhileAssignmentTracker;
typeCheckingContext.ifElseForWhileAssignmentTracker = new HashMap<>();
return oldTracker;
}
@Override
public void visitArrayExpression(final ArrayExpression expression) {
super.visitArrayExpression(expression);
ClassNode elementType;
List<Expression> expressions;
if (expression.hasInitializer()) {
elementType = expression.getElementType();
expressions = expression.getExpressions();
} else {
elementType = int_TYPE;
expressions = expression.getSizeExpression();
}
for (Expression elementExpr : expressions) {
if (!checkCompatibleAssignmentTypes(elementType, getType(elementExpr), elementExpr, false)) {
addStaticTypeError("Cannot convert from " + prettyPrintType(getType(elementExpr)) + " to " + prettyPrintType(elementType), elementExpr);
}
}
}
@Override
public void visitCastExpression(final CastExpression expression) {
ClassNode target = expression.getType();
Expression source = expression.getExpression();
applyTargetType(target, source); // GROOVY-9997
source.visit(this);
if (!expression.isCoerce() && !checkCast(target, source)) {
addStaticTypeError("Inconvertible types: cannot cast " + prettyPrintType(getType(source)) + " to " + prettyPrintType(target), expression);
}
}
protected boolean checkCast(final ClassNode targetType, final Expression source) {
boolean sourceIsNull = isNullConstant(source);
ClassNode expressionType = getType(source);
if (targetType.isArray() && expressionType.isArray()) {
return checkCast(targetType.getComponentType(), varX("foo", expressionType.getComponentType()));
} else if (isPrimitiveChar(targetType) && isStringType(expressionType)
&& source instanceof ConstantExpression && source.getText().length() == 1) {
// ex: (char) 'c'
} else if (isWrapperCharacter(targetType) && (isStringType(expressionType) || sourceIsNull)
&& (sourceIsNull || source instanceof ConstantExpression && source.getText().length() == 1)) {
// ex : (Character) 'c'
} else if (isNumberCategory(getWrapper(targetType)) && (isNumberCategory(getWrapper(expressionType)) || isPrimitiveChar(expressionType))) {
// ex: short s = (short) 0
} else if (sourceIsNull && !isPrimitiveType(targetType)) {
// ex: (Date)null
} else if (isPrimitiveChar(targetType) && isPrimitiveType(expressionType) && isNumberType(expressionType)) {
// char c = (char) ...
} else if (sourceIsNull && isPrimitiveType(targetType) && !isPrimitiveBoolean(targetType)) {
return false;
} else if (!Modifier.isFinal(expressionType.getModifiers()) && targetType.isInterface()) {
return true;
} else if (!Modifier.isFinal(targetType.getModifiers()) && expressionType.isInterface()) {
return true;
} else if (!isAssignableTo(targetType, expressionType) && !implementsInterfaceOrIsSubclassOf(expressionType, targetType)) {
return false;
}
return true;
}
@Override
public void visitTernaryExpression(final TernaryExpression expression) {
Map<VariableExpression, List<ClassNode>> oldTracker = pushAssignmentTracking();
typeCheckingContext.pushTemporaryTypeInfo(); // capture instanceof restriction
if (!(expression instanceof ElvisOperatorExpression)) {
expression.getBooleanExpression().visit(this);
}
Expression trueExpression = expression.getTrueExpression();
ClassNode typeOfTrue = findCurrentInstanceOfClass(trueExpression, null);
typeOfTrue = Optional.ofNullable(typeOfTrue).orElse(visitValueExpression(trueExpression));
typeCheckingContext.popTemporaryTypeInfo(); // instanceof doesn't apply to false branch
Expression falseExpression = expression.getFalseExpression();
ClassNode typeOfFalse = visitValueExpression(falseExpression);
ClassNode resultType;
if (isNullConstant(trueExpression) && isNullConstant(falseExpression)) { // GROOVY-5523
resultType = checkForTargetType(trueExpression, UNKNOWN_PARAMETER_TYPE);
} else if (isNullConstant(trueExpression) || (isEmptyCollection(trueExpression)
&& isOrImplements(typeOfTrue, typeOfFalse))) { // [] : List/Collection/Iterable
resultType = wrapTypeIfNecessary(checkForTargetType(falseExpression, typeOfFalse));
} else if (isNullConstant(falseExpression) || (isEmptyCollection(falseExpression)
&& isOrImplements(typeOfFalse, typeOfTrue))) { // List/Collection/Iterable : []
resultType = wrapTypeIfNecessary(checkForTargetType(trueExpression, typeOfTrue));
} else {
typeOfFalse = checkForTargetType(falseExpression, typeOfFalse);
typeOfTrue = checkForTargetType(trueExpression, typeOfTrue);
resultType = lowestUpperBound(typeOfTrue, typeOfFalse);
}
storeType(expression, resultType);
popAssignmentTracking(oldTracker);
}
/**
* @param expr true or false branch of ternary expression
* @return the inferred type of {@code expr}
*/
private ClassNode visitValueExpression(final Expression expr) {
if (expr instanceof ClosureExpression) {
applyTargetType(checkForTargetType(expr, null), expr);
}
expr.visit(this);
return getType(expr);
}
/**
* @param expr true or false branch of ternary expression
* @param type the inferred type of {@code expr}
*/
private ClassNode checkForTargetType(final Expression expr, final ClassNode type) {
ClassNode targetType = null;
MethodNode enclosingMethod = typeCheckingContext.getEnclosingMethod();
MethodCall enclosingMethodCall = (MethodCall)typeCheckingContext.getEnclosingMethodCall();
BinaryExpression enclosingExpression = typeCheckingContext.getEnclosingBinaryExpression();
if (enclosingExpression != null
&& isAssignment(enclosingExpression.getOperation().getType())
&& isTypeSource(expr, enclosingExpression.getRightExpression())) {
targetType = getDeclaredOrInferredType(enclosingExpression.getLeftExpression());
} else if (enclosingMethodCall != null
&& InvocationWriter.makeArgumentList(enclosingMethodCall.getArguments())
.getExpressions().stream().anyMatch(arg -> isTypeSource(expr, arg))) {
// TODO: locate method target parameter
} else if (enclosingMethod != null
&& !enclosingMethod.isAbstract()
&& !enclosingMethod.isVoidMethod()
&& isTypeSource(expr, enclosingMethod)) {
targetType = enclosingMethod.getReturnType();
}
if (expr instanceof ClosureExpression) { // GROOVY-10271, GROOVY-10272
return isSAMType(targetType) ? targetType : type;
}
if (targetType == null)
targetType = type.getPlainNodeReference();
if (type == UNKNOWN_PARAMETER_TYPE) return targetType;
if (expr instanceof ConstructorCallExpression) { // GROOVY-9972, GROOVY-9983, GROOVY-10114
inferDiamondType((ConstructorCallExpression) expr, targetType);
}
return adjustForTargetType(type, targetType);
}
private static ClassNode adjustForTargetType(final ClassNode resultType, final ClassNode targetType) {
if (targetType.isUsingGenerics()
&& missesGenericsTypes(resultType)
// GROOVY-10324, GROOVY-10342, et al.
&& !resultType.isGenericsPlaceHolder()) {
// unchecked assignment
// List<Type> list = new LinkedList()
// Iterable<Type> iter = new LinkedList()
// Collection<Type> col1 = Collections.emptyList()
// Collection<Type> col2 = Collections.emptyList() ?: []
// Collection<Type> view = ConcurrentHashMap.newKeySet()
// the inferred type of the binary expression is the type of the RHS
// "completed" with generics type information available from the LHS
if (targetType.equals(resultType)) {
// GROOVY-6126, GROOVY-6558, GROOVY-6564, et al.
if (!targetType.isGenericsPlaceHolder()) return targetType;
} else {
// GROOVY-5640, GROOVY-9033, GROOVY-10220, GROOVY-10235, GROOVY-10688, et al.
Map<GenericsTypeName, GenericsType> gt = new HashMap<>();
extractGenericsConnections(gt, resultType, resultType.redirect());
ClassNode sc = resultType;
do { sc = getNextSuperClass(sc, targetType);
} while (sc != null && !sc.equals(targetType));
extractGenericsConnections(gt, targetType, sc);
return applyGenericsContext(gt, resultType.redirect());
}
}
return resultType;
}
private static boolean isTypeSource(final Expression expr, final Expression right) {
if (right instanceof TernaryExpression) {
return isTypeSource(expr, ((TernaryExpression) right).getTrueExpression())
|| isTypeSource(expr, ((TernaryExpression) right).getFalseExpression());
}
return expr == right;
}
private static boolean isTypeSource(final Expression expr, final MethodNode mNode) {
boolean[] returned = new boolean[1];
mNode.getCode().visit(new CodeVisitorSupport() {
@Override
public void visitReturnStatement(final ReturnStatement returnStatement) {
if (isTypeSource(expr, returnStatement.getExpression())) {
returned[0] = true;
}
}
@Override
public void visitClosureExpression(final ClosureExpression expression) {
}
});
if (!returned[0]) {
new ReturnAdder(returnStatement -> {
if (isTypeSource(expr, returnStatement.getExpression())) {
returned[0] = true;
}
}).visitMethod(mNode);
}
return returned[0];
}
private static boolean isEmptyCollection(final Expression expr) {
return isEmptyList(expr) || isEmptyMap(expr);
}
private static boolean isEmptyList(final Expression expr) {
return expr instanceof ListExpression && ((ListExpression) expr).getExpressions().isEmpty();
}
private static boolean isEmptyMap(final Expression expr) {
return expr instanceof MapExpression && ((MapExpression) expr).getMapEntryExpressions().isEmpty();
}
@Override
public void visitTryCatchFinally(final TryCatchStatement statement) {
List<CatchStatement> catchStatements = statement.getCatchStatements();
for (CatchStatement catchStatement : catchStatements) {
ClassNode exceptionType = catchStatement.getExceptionType();
typeCheckingContext.controlStructureVariables.put(catchStatement.getVariable(), exceptionType);
}
try {
super.visitTryCatchFinally(statement);
} finally {
for (CatchStatement catchStatement : catchStatements) {
typeCheckingContext.controlStructureVariables.remove(catchStatement.getVariable());
}
}
}
protected void storeType(final Expression exp, ClassNode cn) {
if (cn == UNKNOWN_PARAMETER_TYPE) { // null for assignment or parameter
// instead of storing an "unknown" type, reset the type information
// by determining the declaration type of the expression
cn = getOriginalDeclarationType(exp);
// GROOVY-10356, GROOVY-10623: "def"
if (isDynamicTyped(cn)) return;
}
if (cn != null && isPrimitiveType(cn)) {
if (exp instanceof VariableExpression && ((VariableExpression) exp).isClosureSharedVariable()) {
cn = getWrapper(cn);
} else if (exp instanceof MethodCallExpression && ((MethodCallExpression) exp).isSafe()) {
cn = getWrapper(cn);
} else if (exp instanceof PropertyExpression && ((PropertyExpression) exp).isSafe()) {
cn = getWrapper(cn);
}
}
ClassNode oldValue = (ClassNode) exp.putNodeMetaData(INFERRED_TYPE, cn);
if (oldValue != null) {
// this may happen when a variable declaration type is wider than the subsequent assignment values
// for example :
// def o = 1 // first, an int
// o = 'String' // then a string
// o = new Object() // and eventually an object !
// in that case, the INFERRED_TYPE corresponds to the current inferred type, while
// DECLARATION_INFERRED_TYPE is the type which should be used for the initial type declaration
ClassNode oldDIT = exp.getNodeMetaData(DECLARATION_INFERRED_TYPE);
if (oldDIT != null) {
exp.putNodeMetaData(DECLARATION_INFERRED_TYPE, cn == null ? oldDIT : lowestUpperBound(oldDIT, cn));
} else {
exp.putNodeMetaData(DECLARATION_INFERRED_TYPE, cn == null ? null : lowestUpperBound(oldValue, cn));
}
}
if (exp instanceof VariableExpression) {
VariableExpression var = (VariableExpression) exp;
Variable accessedVariable = var.getAccessedVariable();
if (accessedVariable instanceof VariableExpression) {
if (accessedVariable != exp)
storeType((VariableExpression) accessedVariable, cn);
} else if (accessedVariable instanceof Parameter
|| accessedVariable instanceof PropertyNode
&& ((PropertyNode) accessedVariable).getField().isSynthetic()) {
((AnnotatedNode) accessedVariable).putNodeMetaData(INFERRED_TYPE, cn);
}
if (cn != null && var.isClosureSharedVariable()) {
List<ClassNode> assignedTypes = typeCheckingContext.closureSharedVariablesAssignmentTypes.computeIfAbsent(var, k -> new LinkedList<ClassNode>());
assignedTypes.add(cn);
}
if (!typeCheckingContext.temporaryIfBranchTypeInformation.isEmpty()) {
List<ClassNode> temporaryTypesForExpression = getTemporaryTypesForExpression(exp);
if (temporaryTypesForExpression != null && !temporaryTypesForExpression.isEmpty()) {
// a type inference has been made on a variable whose type was defined in an instanceof block
// we erase available information with the new type
temporaryTypesForExpression.clear();
}
}
}
}
protected ClassNode getResultType(ClassNode left, final int op, final ClassNode right, final BinaryExpression expr) {
ClassNode leftRedirect = left.redirect();
ClassNode rightRedirect = right.redirect();
Expression leftExpression = expr.getLeftExpression();
Expression rightExpression = expr.getRightExpression();
if (op == EQUAL || op == ELVIS_EQUAL) {
if (rightRedirect.isDerivedFrom(CLOSURE_TYPE)) {
ClosureExpression closureExpression = null;
if (rightExpression instanceof ClosureExpression) {
closureExpression = (ClosureExpression) rightExpression;
} else if (rightExpression instanceof MethodReferenceExpression) {
closureExpression = rightExpression.getNodeMetaData(CONSTRUCTED_LAMBDA_EXPRESSION);
}
if (closureExpression != null) {
MethodNode abstractMethod = findSAM(left);
if (abstractMethod != null) {
return inferSAMTypeGenericsInAssignment(left, abstractMethod, right, closureExpression);
}
}
}
if (leftExpression instanceof VariableExpression) {
ClassNode initialType = getOriginalDeclarationType(leftExpression);
if (isPrimitiveType(rightRedirect) && initialType.isDerivedFrom(Number_TYPE)) {
return getWrapper(right);
}
if (isPrimitiveType(initialType) && rightRedirect.isDerivedFrom(Number_TYPE)) {
return getUnwrapper(right);
}
// as anything can be assigned to a String, Class or [Bb]oolean, return the left type instead
if (isWildcardLeftHandSide(initialType) && !isObjectType(initialType)) {
return initialType;
}
}
if (!isObjectType(leftRedirect)) {
if (rightExpression instanceof ListExpression) {
if (LIST_TYPE.equals(leftRedirect)
|| ITERABLE_TYPE.equals(leftRedirect)
|| Collection_TYPE.equals(leftRedirect)
|| ArrayList_TYPE.isDerivedFrom(leftRedirect)) { // GROOVY-6912
return getLiteralResultType(left, right, ArrayList_TYPE); // GROOVY-7128
}
if (SET_TYPE.equals(leftRedirect)
|| LinkedHashSet_TYPE.isDerivedFrom(leftRedirect)) { // GROOVY-6912
return getLiteralResultType(left, right, LinkedHashSet_TYPE); // GROOVY-7128
}
}
if (rightExpression instanceof MapExpression) {
if (MAP_TYPE.equals(leftRedirect)
|| LinkedHashMap_TYPE.isDerivedFrom(leftRedirect)) {
return getLiteralResultType(left, right, LinkedHashMap_TYPE); // GROOVY-7128, GROOVY-9844
}
}
}
return right;
}
if (isBoolIntrinsicOp(op)) {
return boolean_TYPE;
}
if (op == FIND_REGEX) {
return Matcher_TYPE;
}
if (isArrayOp(op)) {
// using getPNR() to ignore generics at this point
// and a different binary expression not to pollute the AST
BinaryExpression newExpr = binX(leftExpression, expr.getOperation(), rightExpression);
newExpr.setSourcePosition(expr);
MethodNode method = findMethodOrFail(newExpr, left.getPlainNodeReference(), "getAt", right.getPlainNodeReference());
if (method != null && implementsInterfaceOrIsSubclassOf(right, RANGE_TYPE)) {
return inferReturnTypeGenerics(left, method, rightExpression);
}
return method != null ? inferComponentType(left, right) : null;
}
String operationName = getOperationName(op);
if (operationName == null) throw new GroovyBugError(
"Unknown result type for binary operator " + op);
// the left operand is determining the result of the operation
// for primitives and their wrapper we use a fixed table here:
ClassNode mathResultType = getMathResultType(op, leftRedirect, rightRedirect, operationName);
if (mathResultType != null) {
return mathResultType;
}
// GROOVY-9006: compare to null for types that overload equals
if ("equals".equals(operationName) && (left == UNKNOWN_PARAMETER_TYPE
|| right == UNKNOWN_PARAMETER_TYPE)) {
return boolean_TYPE;
}
// GROOVY-5890: do not mix Class<Type> with Type
if (leftExpression instanceof ClassExpression) {
left = CLASS_Type.getPlainNodeReference();
}
MethodNode method = findMethodOrFail(expr, left, operationName, right);
if (method != null) {
storeTargetMethod(expr, method);
typeCheckMethodsWithGenericsOrFail(left, new ClassNode[]{right}, method, expr);
if (isAssignment(op)) return left;
if (!"compareTo".equals(operationName))
return inferReturnTypeGenerics(left, method, args(rightExpression));
}
if (isCompareToBoolean(op)) return boolean_TYPE;
if (op == COMPARE_TO) return int_TYPE;
return null;
}
/**
* For "{@code List<Type> x = [...]}" or "{@code Set<Type> y = [...]}", etc.
* the literal may be composed of sub-types of {@code Type}. In these cases,
* {@code ArrayList<Type>} is an appropriate result type for the expression.
*/
private static ClassNode getLiteralResultType(final ClassNode targetType, final ClassNode sourceType, final ClassNode baseType) {
ClassNode resultType = sourceType.equals(baseType) ? sourceType
: GenericsUtils.parameterizeType(sourceType, baseType.getPlainNodeReference());
if (targetType.getGenericsTypes() != null
&& !GenericsUtils.buildWildcardType(targetType).isCompatibleWith(resultType)) {
BiPredicate<GenericsType, GenericsType> isEqualOrSuper = (target, source) -> {
if (target.isCompatibleWith(source.getType())) {
return true;
}
if (!target.isPlaceholder() && !target.isWildcard()) {
return GenericsUtils.buildWildcardType(getCombinedBoundType(target)).isCompatibleWith(source.getType());
}
return false;
};
GenericsType[] lgt = targetType.getGenericsTypes(), rgt = resultType.getGenericsTypes();
if (IntStream.range(0, lgt.length).allMatch(i -> isEqualOrSuper.test(lgt[i], rgt[i]))) {
resultType = GenericsUtils.parameterizeType(targetType, baseType.getPlainNodeReference());
}
}
return resultType;
}
private static ClassNode getMathResultType(final int op, final ClassNode leftRedirect, final ClassNode rightRedirect, final String operationName) {
if (isNumberType(leftRedirect) && isNumberType(rightRedirect)) {
if (isOperationInGroup(op)) {
if (isIntCategory(leftRedirect) && isIntCategory(rightRedirect)) return int_TYPE;
if (isLongCategory(leftRedirect) && isLongCategory(rightRedirect)) return long_TYPE;
if (isFloat(leftRedirect) && isFloat(rightRedirect)) return float_TYPE;
if (isDouble(leftRedirect) && isDouble(rightRedirect)) return double_TYPE;
} else if (isPowerOperator(op)) {
return Number_TYPE;
} else if (isBitOperator(op) || op == INTDIV || op == INTDIV_EQUAL) {
if (isIntCategory(getUnwrapper(leftRedirect)) && isIntCategory(getUnwrapper(rightRedirect)))
return int_TYPE;
if (isLongCategory(getUnwrapper(leftRedirect)) && isLongCategory(getUnwrapper(rightRedirect)))
return long_TYPE;
if (isBigIntCategory(getUnwrapper(leftRedirect)) && isBigIntCategory(getUnwrapper(rightRedirect)))
return BigInteger_TYPE;
} else if (isCompareToBoolean(op) || op == COMPARE_EQUAL || op == COMPARE_NOT_EQUAL) {
return boolean_TYPE;
}
} else if (isPrimitiveChar(leftRedirect) && isPrimitiveChar(rightRedirect)) {
if (isCompareToBoolean(op) || op == COMPARE_EQUAL || op == COMPARE_NOT_EQUAL) {
return boolean_TYPE;
}
}
// try to find a method for the operation
if (isShiftOperation(operationName) && isNumberCategory(leftRedirect) && (isIntCategory(rightRedirect) || isLongCategory(rightRedirect))) {
return leftRedirect;
}
// Divisions may produce different results depending on operand types
if (isNumberCategory(getWrapper(rightRedirect)) && (isNumberCategory(getWrapper(leftRedirect)) && (DIVIDE == op || DIVIDE_EQUAL == op))) {
if (isFloatingCategory(leftRedirect) || isFloatingCategory(rightRedirect)) {
if (!isPrimitiveType(leftRedirect) || !isPrimitiveType(rightRedirect)) {
return Double_TYPE;
}
return double_TYPE;
}
if (DIVIDE == op) {
return BigDecimal_TYPE;
}
return leftRedirect;
} else if (isOperationInGroup(op)) {
if (isNumberCategory(getWrapper(leftRedirect)) && isNumberCategory(getWrapper(rightRedirect))) {
return getGroupOperationResultType(leftRedirect, rightRedirect);
}
}
if (isNumberCategory(getWrapper(rightRedirect)) && isNumberCategory(getWrapper(leftRedirect)) && (MOD == op || MOD_EQUAL == op)) {
return leftRedirect;
}
return null;
}
private ClassNode inferSAMTypeGenericsInAssignment(final ClassNode samType, final MethodNode abstractMethod, final ClassNode closureType, final ClosureExpression closureExpression) {
// if the sam type or closure type do not provide generics information,
// we cannot infer anything, thus we simply return the provided samUsage
GenericsType[] samTypeGenerics = samType.getGenericsTypes();
GenericsType[] closureGenerics = closureType.getGenericsTypes();
if (samTypeGenerics == null || closureGenerics == null) return samType;
// extract the generics from the return type
Map<GenericsTypeName, GenericsType> connections = new HashMap<>();
extractGenericsConnections(connections, wrapTypeIfNecessary(getInferredReturnType(closureExpression)), abstractMethod.getReturnType());
// next we get the block parameter types and set the generics
// information just like before
// TODO: add vargs handling
if (closureExpression.isParameterSpecified()) {
Parameter[] closureParams = closureExpression.getParameters();
Parameter[] methodParams = abstractMethod.getParameters();
for (int i = 0, n = Math.min(closureParams.length, methodParams.length); i < n; i += 1) {
ClassNode closureParamType = closureParams[i].getType();
ClassNode methodParamType = methodParams[i].getType();
extractGenericsConnections(connections, closureParamType, methodParamType);
}
}
return applyGenericsContext(connections, samType.redirect());
}
protected static ClassNode getGroupOperationResultType(final ClassNode a, final ClassNode b) {
if (isBigIntCategory(a) && isBigIntCategory(b)) return BigInteger_TYPE;
if (isBigDecCategory(a) && isBigDecCategory(b)) return BigDecimal_TYPE;
if (isBigDecimalType(a) || isBigDecimalType(b)) return BigDecimal_TYPE;
if (isBigIntegerType(a) || isBigIntegerType(b)) {
if (isBigIntCategory(a) && isBigIntCategory(b)) return BigInteger_TYPE;
return BigDecimal_TYPE;
}
if (isPrimitiveDouble(a) || isPrimitiveDouble(b)) return double_TYPE;
if (isWrapperDouble(a) || isWrapperDouble(b)) return Double_TYPE;
if (isPrimitiveFloat(a) || isPrimitiveFloat(b)) return float_TYPE;
if (isWrapperFloat(a) || isWrapperFloat(b)) return Float_TYPE;
if (isPrimitiveLong(a) || isPrimitiveLong(b)) return long_TYPE;
if (isWrapperLong(a) || isWrapperLong(b)) return Long_TYPE;
if (isPrimitiveInt(a) || isPrimitiveInt(b)) return int_TYPE;
if (isWrapperInteger(a) || isWrapperInteger(b)) return Integer_TYPE;
if (isPrimitiveShort(a) || isPrimitiveShort(b)) return short_TYPE;
if (isWrapperShort(a) || isWrapperShort(b)) return Short_TYPE;
if (isPrimitiveByte(a) || isPrimitiveByte(b)) return byte_TYPE;
if (isWrapperByte(a) || isWrapperByte(b)) return Byte_TYPE;
if (isPrimitiveChar(a) || isPrimitiveChar(b)) return char_TYPE;
if (isWrapperCharacter(a) || isWrapperCharacter(b)) return Character_TYPE;
return Number_TYPE;
}
protected ClassNode inferComponentType(final ClassNode receiverType, final ClassNode subscriptType) {
ClassNode componentType = receiverType.getComponentType();
if (componentType == null) {
MethodCallExpression mce;
if (subscriptType != null) { // GROOVY-5521: check for a suitable "getAt(T)" method
mce = callX(varX("#", receiverType), "getAt", varX("selector", subscriptType));
} else { // GROOVY-8133: check for an "iterator()" method
mce = callX(varX("#", receiverType), "iterator");
}
mce.setImplicitThis(false); // GROOVY-8943
typeCheckingContext.pushErrorCollector();
try {
visitMethodCallExpression(mce);
} finally {
typeCheckingContext.popErrorCollector();
}
if (subscriptType != null) {
componentType = getType(mce);
} else {
ClassNode iteratorType = getType(mce);
if (isOrImplements(iteratorType, Iterator_TYPE) && (iteratorType.getGenericsTypes() != null
// ignore the iterator(Object) extension method, since it makes *everything* appear iterable
|| !mce.<MethodNode>getNodeMetaData(DIRECT_METHOD_CALL_TARGET).getDeclaringClass().equals(OBJECT_TYPE))) {
componentType = Optional.ofNullable(iteratorType.getGenericsTypes()).map(gt -> getCombinedBoundType(gt[0])).orElse(OBJECT_TYPE);
}
}
}
return componentType;
}
protected MethodNode findMethodOrFail(final Expression expr, final ClassNode receiver, final String name, final ClassNode... args) {
List<MethodNode> methods = findMethod(receiver, name, args);
if (methods.isEmpty() && (expr instanceof BinaryExpression)) {
BinaryExpression be = (BinaryExpression) expr;
MethodCallExpression call = callX(be.getLeftExpression(), name, be.getRightExpression());
methods = extension.handleMissingMethod(receiver, name, args(be.getLeftExpression()), args, call);
}
if (methods.isEmpty()) {
addNoMatchingMethodError(receiver, name, args, expr);
} else {
if (areCategoryMethodCalls(methods, name, args)) {
addCategoryMethodCallError(expr);
}
methods = disambiguateMethods(methods, receiver, args, expr);
if (methods.size() == 1) {
return methods.get(0);
} else {
addAmbiguousErrorMessage(methods, name, args, expr);
}
}
return null;
}
private List<MethodNode> disambiguateMethods(List<MethodNode> methods, final ClassNode receiver, final ClassNode[] arguments, final Expression call) {
if (methods.size() > 1 && receiver != null && arguments != null) {
List<MethodNode> filteredWithGenerics = new LinkedList<>();
for (MethodNode method : methods) {
if (typeCheckMethodsWithGenerics(receiver, arguments, method)
&& (method.getModifiers() & Opcodes.ACC_BRIDGE) == 0) {
filteredWithGenerics.add(method);
}
}
if (filteredWithGenerics.size() == 1) {
return filteredWithGenerics;
}
methods = extension.handleAmbiguousMethods(methods, call);
}
if (methods.size() > 1 && call instanceof MethodCall) {
String methodName = ((MethodCall) call).getMethodAsString();
methods = methods.stream().filter(m -> m.getName().equals(methodName)).collect(Collectors.toList());
}
return methods;
}
protected static String prettyPrintMethodList(final List<MethodNode> nodes) {
StringBuilder sb = new StringBuilder("[");
for (int i = 0, n = nodes.size(); i < n; i += 1) {
MethodNode node = nodes.get(i);
sb.append(prettyPrintType(node.getReturnType()));
sb.append(" ");
sb.append(prettyPrintTypeName(node.getDeclaringClass()));
sb.append("#");
sb.append(toMethodParametersString(node.getName(), extractTypesFromParameters(node.getParameters())));
if (i < n - 1) sb.append(", ");
}
sb.append("]");
return sb.toString();
}
protected boolean areCategoryMethodCalls(final List<MethodNode> foundMethods, final String name, final ClassNode[] args) {
boolean category = false;
if ("use".equals(name) && args != null && args.length == 2 && args[1].equals(CLOSURE_TYPE)) {
category = true;
for (MethodNode method : foundMethods) {
if (!(method instanceof ExtensionMethodNode) || !((ExtensionMethodNode) method).getExtensionMethodNode().getDeclaringClass().equals(DGM_CLASSNODE)) {
category = false;
break;
}
}
}
return category;
}
/**
* Returns methods defined for the specified receiver and adds "non-existing"
* methods that will be generated afterwards by the compiler; for example if
* a method is using default values and the class node is not compiled yet.
*
* @param receiver the type to search for methods
* @param name the name of the methods to return
* @return the methods that are defined on the receiver completed with stubs for future methods
*/
protected List<MethodNode> findMethodsWithGenerated(final ClassNode receiver, final String name) {
if (receiver.isArray()) {
if (name.equals("clone")) { // GROOVY-10319: array clone -- <https://docs.oracle.com/javase/specs/jls/se8/html/jls-10.html#jls-10.7>
MethodNode clone = new MethodNode("clone", Opcodes.ACC_PUBLIC, OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null);
clone.setDeclaringClass(OBJECT_TYPE); // retain Object for declaringClass and returnType
clone.setNodeMetaData(INFERRED_RETURN_TYPE, receiver);
return Collections.singletonList(clone);
} else {
return OBJECT_TYPE.getMethods(name);
}
}
List<MethodNode> methods = receiver.getMethods(name);
// GROOVY-5166, GROOVY-9890, GROOVY-10700: non-static interface/trait methods
Set<ClassNode> done = new HashSet<>();
for (ClassNode next = receiver; next != null; next = next.getSuperClass()) {
done.add(next);
for (ClassNode face : next.getAllInterfaces()) {
if (done.add(face)) {
for (MethodNode mn : face.getDeclaredMethods(name)) {
if (mn.isPublic() && !mn.isStatic()) methods.add(mn);
}
}
}
}
if (receiver.isInterface()) {
methods.addAll(OBJECT_TYPE.getMethods(name));
}
if (!receiver.isResolved() && !methods.isEmpty()) {
methods = addGeneratedMethods(receiver, methods);
}
return methods;
}
private static List<MethodNode> addGeneratedMethods(final ClassNode receiver, final List<MethodNode> methods) {
// using a comparator of parameters
List<MethodNode> result = new LinkedList<>();
for (MethodNode method : methods) {
result.add(method);
Parameter[] parameters = method.getParameters();
int counter = 0;
int size = parameters.length;
for (int i = size - 1; i >= 0; i--) {
Parameter parameter = parameters[i];
if (parameter != null && parameter.hasInitialExpression()) {
counter++;
}
}
for (int j = 1; j <= counter; j++) {
Parameter[] newParams = new Parameter[parameters.length - j];
int index = 0;
int k = 1;
for (Parameter parameter : parameters) {
if (k > counter - j && parameter != null && parameter.hasInitialExpression()) {
k++;
} else if (parameter != null && parameter.hasInitialExpression()) {
newParams[index++] = parameter;
k++;
} else {
newParams[index++] = parameter;
}
}
MethodNode stubbed;
if (method.isConstructor()) {
stubbed = new ConstructorNode(
method.getModifiers(),
newParams,
method.getExceptions(),
GENERATED_EMPTY_STATEMENT
);
} else {
stubbed = new MethodNode(
method.getName(),
method.getModifiers(),
method.getReturnType(),
newParams,
method.getExceptions(),
GENERATED_EMPTY_STATEMENT
);
stubbed.setGenericsTypes(method.getGenericsTypes());
}
stubbed.setDeclaringClass(method.getDeclaringClass());
result.add(stubbed);
}
}
return result;
}
protected List<MethodNode> findMethod(ClassNode receiver, final String name, final ClassNode... args) {
if (isPrimitiveType(receiver)) receiver = getWrapper(receiver);
List<MethodNode> methods;
if ("<init>".equals(name) && !receiver.isInterface()) {
methods = addGeneratedMethods(receiver, new ArrayList<>(receiver.getDeclaredConstructors()));
if (methods.isEmpty()) {
MethodNode node = new ConstructorNode(Opcodes.ACC_PUBLIC, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, GENERATED_EMPTY_STATEMENT);
node.setDeclaringClass(receiver);
methods.add(node);
if (receiver.isArray()) {
// No need to check the arguments against an array constructor: it just needs to exist. The array is
// created through coercion or by specifying its dimension(s), anyway, and would not match an
// arbitrary number of parameters.
return methods;
}
}
} else {
methods = findMethodsWithGenerated(receiver, name);
if ("call".equals(name) && receiver.isInterface()) {
MethodNode sam = findSAM(receiver);
if (sam != null) {
MethodNode callMethod = new MethodNode("call", sam.getModifiers(), sam.getReturnType(), sam.getParameters(), sam.getExceptions(), sam.getCode());
callMethod.setDeclaringClass(sam.getDeclaringClass());
callMethod.setSourcePosition(sam);
methods.add(callMethod);
}
}
if (!receiver.isStaticClass() && receiver.getOuterClass() != null
&& typeCheckingContext.getEnclosingClassNodes().contains(receiver)) {
ClassNode outer = receiver.getOuterClass();
do { methods.addAll(findMethodsWithGenerated(outer, name));
} while (!outer.isStaticClass() && (outer = outer.getOuterClass()) != null);
}
if (methods.isEmpty()) {
addArrayMethods(methods, receiver, name, args);
}
if (methods.isEmpty() && (args == null || args.length == 0)) {
// check if it's a property
String pname = extractPropertyNameFromMethodName("get", name);
if (pname == null) {
pname = extractPropertyNameFromMethodName("is", name);
}
PropertyNode property = null;
if (pname != null) {
property = findProperty(receiver, pname);
} else {
out: // look for property via getGetterName() for non-canonical case
for (ClassNode cn = receiver; cn != null; cn = cn.getSuperClass()) {
for (PropertyNode pn : cn.getProperties()) {
if (name.equals(pn.getGetterName())) {
property = pn;
break out;
}
}
}
}
if (property != null) {
int mods = Opcodes.ACC_PUBLIC | (property.isStatic() ? Opcodes.ACC_STATIC : 0);
MethodNode node = new MethodNode(name, mods, property.getType(), Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, GENERATED_EMPTY_STATEMENT);
node.setDeclaringClass(property.getDeclaringClass());
return Collections.singletonList(node);
}
} else if (methods.isEmpty() && args.length == 1) {
// maybe we are looking for a setter ?
String pname = extractPropertyNameFromMethodName("set", name);
if (pname != null) {
PropertyNode property = findProperty(receiver, pname);
if (property != null && !Modifier.isFinal(property.getModifiers())) {
ClassNode type = property.getOriginType();
if (implementsInterfaceOrIsSubclassOf(wrapTypeIfNecessary(args[0]), wrapTypeIfNecessary(type))) {
int mods = Opcodes.ACC_PUBLIC | (property.isStatic() ? Opcodes.ACC_STATIC : 0);
MethodNode node = new MethodNode(name, mods, VOID_TYPE, new Parameter[]{new Parameter(type, name)}, ClassNode.EMPTY_ARRAY, GENERATED_EMPTY_STATEMENT);
node.setDeclaringClass(property.getDeclaringClass());
return Collections.singletonList(node);
}
}
}
}
}
if (!name.endsWith("init>")) { // also search for extension methods
findDGMMethodsByNameAndArguments(getSourceUnit().getClassLoader(), receiver, name, args, methods);
}
methods = filterMethodsByVisibility(methods, typeCheckingContext.getEnclosingClassNode());
List<MethodNode> chosen = chooseBestMethod(receiver, methods, args);
if (!chosen.isEmpty()) return chosen;
// GROOVY-5566
if (receiver instanceof InnerClassNode && ((InnerClassNode) receiver).isAnonymous() && methods.size() == 1 && args != null && "<init>".equals(name)) {
MethodNode constructor = methods.get(0);
if (constructor.getParameters().length == args.length) {
return methods;
}
}
if (isClassClassNodeWrappingConcreteType(receiver)) { // GROOVY-6802, GROOVY-6803
List<MethodNode> result = findMethod(receiver.getGenericsTypes()[0].getType(), name, args);
if (!result.isEmpty()) return result;
}
if (isGStringType(receiver)) {
return findMethod(STRING_TYPE, name, args);
}
return EMPTY_METHODNODE_LIST;
}
private PropertyNode findProperty(final ClassNode receiver, final String name) {
for (ClassNode cn = receiver; cn != null; cn = cn.getSuperClass()) {
PropertyNode property = cn.getProperty(name);
if (property != null) return property;
if (!cn.isStaticClass() && cn.getOuterClass() != null
&& typeCheckingContext.getEnclosingClassNodes().contains(cn)) {
ClassNode outer = cn.getOuterClass();
do {
property = outer.getProperty(name);
if (property != null) return property;
} while (!outer.isStaticClass() && (outer = outer.getOuterClass()) != null);
}
}
return null;
}
/**
* Given a method name and a prefix, returns the name of the property that should be looked up,
* following the java beans rules. For example, "getName" would return "name", while
* "getFullName" would return "fullName".
* If the prefix is not found, returns null.
*
* @param prefix the method name prefix ("get", "is", "set", ...)
* @param methodName the method name
* @return a property name if the prefix is found and the method matches the java beans rules, null otherwise
*/
public static String extractPropertyNameFromMethodName(final String prefix, final String methodName) {
if (prefix == null || methodName == null) return null;
if (methodName.startsWith(prefix) && prefix.length() < methodName.length()) {
String result = methodName.substring(prefix.length());
String propertyName = decapitalize(result);
if (result.equals(capitalize(propertyName))) return propertyName;
}
return null;
}
protected ClassNode getType(final ASTNode node) {
ClassNode type = node.getNodeMetaData(INFERRED_TYPE);
if (type != null) {
return type;
}
if (node instanceof ClassExpression) {
type = ((ClassExpression) node).getType();
return makeClassSafe0(CLASS_Type, new GenericsType(type));
}
if (node instanceof VariableExpression) {
VariableExpression vexp = (VariableExpression) node;
type = isTraitSelf(vexp);
if (type != null) return makeSelf(type);
if (vexp.isThisExpression()) return makeThis();
if (vexp.isSuperExpression()) return makeSuper();
Variable variable = vexp.getAccessedVariable();
if (variable instanceof FieldNode) {
FieldNode fieldNode = (FieldNode) variable;
ClassNode fieldType = fieldNode.getOriginType();
if (!fieldNode.isStatic() && GenericsUtils.hasUnresolvedGenerics(fieldType)) {
ClassNode declType = fieldNode.getDeclaringClass(), thisType = typeCheckingContext.getEnclosingClassNode();
fieldType = resolveGenericsWithContext(extractPlaceHolders(thisType, declType), fieldType);
}
return fieldType;
}
if (variable != vexp && variable instanceof VariableExpression) {
return getType((VariableExpression) variable);
}
if (variable instanceof Parameter) {
Parameter parameter = (Parameter) variable;
// check if param part of control structure - but not if inside instanceof
List<ClassNode> temporaryTypesForExpression = getTemporaryTypesForExpression(vexp);
if (temporaryTypesForExpression == null || temporaryTypesForExpression.isEmpty()) {
type = typeCheckingContext.controlStructureVariables.get(parameter);
}
// now check for closure override
if (type == null && temporaryTypesForExpression == null) {
type = getTypeFromClosureArguments(parameter);
}
if (type != null) {
storeType(vexp, type);
return type;
}
return getType((Parameter) variable);
}
return vexp.getOriginType();
}
if (node instanceof Parameter || node instanceof FieldNode || node instanceof PropertyNode) {
return ((Variable) node).getOriginType();
}
if (node instanceof MethodNode) {
if ((node == GET_DELEGATE || node == GET_OWNER || node == GET_THISOBJECT)
&& typeCheckingContext.getEnclosingClosure() != null) {
return typeCheckingContext.getEnclosingClassNode();
}
type = ((MethodNode) node).getReturnType();
return Optional.ofNullable(getInferredReturnType(node)).orElse(type);
}
if (node instanceof MethodCall) {
if (node instanceof ConstructorCallExpression) {
return ((ConstructorCallExpression) node).getType();
}
MethodNode target = node.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
if (target != null) {
return getType(target);
}
}
if (node instanceof ClosureExpression) {
type = CLOSURE_TYPE.getPlainNodeReference();
ClassNode returnType = getInferredReturnType(node);
if (returnType != null) {
type.setGenericsTypes(new GenericsType[]{
new GenericsType(wrapTypeIfNecessary(returnType))
});
}
Parameter[] parameters = ((ClosureExpression) node).getParameters();
int nParameters = parameters == null ? 0
: parameters.length == 0 ? -1 : parameters.length;
type.putNodeMetaData(CLOSURE_ARGUMENTS, nParameters);
return type;
}
if (node instanceof ListExpression) {
return inferListExpressionType((ListExpression) node);
}
if (node instanceof MapExpression) {
return inferMapExpressionType((MapExpression) node);
}
if (node instanceof RangeExpression) {
RangeExpression re = (RangeExpression) node;
ClassNode fromType = getType(re.getFrom());
ClassNode toType = getType(re.getTo());
if (fromType.equals(toType)) {
type = wrapTypeIfNecessary(fromType);
} else {
type = wrapTypeIfNecessary(lowestUpperBound(fromType, toType));
}
return makeClassSafe0(RANGE_TYPE, new GenericsType(type));
}
if (node instanceof SpreadExpression) {
type = getType(((SpreadExpression) node).getExpression());
return inferComponentType(type, null); // for list literal
}
if (node instanceof UnaryPlusExpression) {
return getType(((UnaryPlusExpression) node).getExpression());
}
if (node instanceof UnaryMinusExpression) {
return getType(((UnaryMinusExpression) node).getExpression());
}
if (node instanceof BitwiseNegationExpression) {
return getType(((BitwiseNegationExpression) node).getExpression());
}
return ((Expression) node).getType();
}
private ClassNode getTypeFromClosureArguments(final Parameter parameter) {
for (TypeCheckingContext.EnclosingClosure enclosingClosure : typeCheckingContext.getEnclosingClosureStack()) {
ClosureExpression closureExpression = enclosingClosure.getClosureExpression();
ClassNode[] closureParamTypes = closureExpression.getNodeMetaData(CLOSURE_ARGUMENTS);
if (closureParamTypes != null) {
Parameter[] parameters = closureExpression.getParameters();
if (parameters != null) {
final int n = parameters.length;
String parameterName = parameter.getName();
if (n == 0 && parameterName.equals("it")) {
return closureParamTypes.length > 0 ? closureParamTypes[0] : null;
}
for (int i = 0; i < n; i += 1) {
if (parameterName.equals(parameters[i].getName())) {
return closureParamTypes.length > i ? closureParamTypes[i] : null;
}
}
}
}
}
return null;
}
private static ClassNode makeSelf(final ClassNode trait) {
ClassNode selfType = trait;
Set<ClassNode> selfTypes = Traits.collectSelfTypes(selfType, new LinkedHashSet<>());
if (!selfTypes.isEmpty()) {
selfTypes.add(selfType);
selfType = new UnionTypeClassNode(selfTypes.toArray(ClassNode.EMPTY_ARRAY));
}
return selfType;
}
private ClassNode makeSuper() {
return makeType(typeCheckingContext.getEnclosingClassNode().getUnresolvedSuperClass(), typeCheckingContext.isInStaticContext);
}
private ClassNode makeThis() {
return makeType(typeCheckingContext.getEnclosingClassNode(), typeCheckingContext.isInStaticContext);
}
/**
* Wrap type in Class&lt;&gt; if usingClass==true.
*/
private static ClassNode makeType(final ClassNode cn, final boolean usingClass) {
if (usingClass) {
ClassNode clazzType = CLASS_Type.getPlainNodeReference();
clazzType.setGenericsTypes(new GenericsType[]{new GenericsType(cn)});
return clazzType;
} else {
return cn;
}
}
/**
* Stores the inferred return type of a closure or a method. We are using a separate key to store
* inferred return type because the inferred type of a closure is {@link Closure}, which is different
* from the inferred type of the code of the closure.
*
* @param node a {@link ClosureExpression} or a {@link MethodNode}
* @param type the inferred return type of the code
* @return the old value of the inferred type
*/
protected ClassNode storeInferredReturnType(final ASTNode node, final ClassNode type) {
if (!(node instanceof ClosureExpression)) {
throw new IllegalArgumentException("Storing inferred return type is only allowed on closures but found " + node.getClass());
}
return (ClassNode) node.putNodeMetaData(INFERRED_RETURN_TYPE, type);
}
/**
* Returns the inferred return type of a closure or a method, if stored on the AST node. This method
* doesn't perform any type inference by itself.
*
* @param exp a {@link ClosureExpression} or {@link MethodNode}
* @return the inferred type, as stored on node metadata.
*/
protected ClassNode getInferredReturnType(final ASTNode exp) {
return exp.getNodeMetaData(INFERRED_RETURN_TYPE);
}
protected ClassNode inferListExpressionType(final ListExpression list) {
List<Expression> expressions = list.getExpressions();
int nExpressions = expressions.size();
if (nExpressions == 0) {
return list.getType();
}
ClassNode listType = list.getType();
GenericsType[] genericsTypes = listType.getGenericsTypes();
if ((genericsTypes == null
|| genericsTypes.length == 0
|| (genericsTypes.length == 1 && isObjectType(genericsTypes[0].getType())))) {
// maybe we can infer the component type
List<ClassNode> nodes = new ArrayList<>(nExpressions);
for (Expression expression : expressions) {
if (isNullConstant(expression)) {
// a null element is found in the list, skip it because we'll use the other elements from the list
} else {
nodes.add(getType(expression));
}
}
if (!nodes.isEmpty()) {
ClassNode itemType = lowestUpperBound(nodes);
listType = listType.getPlainNodeReference();
listType.setGenericsTypes(new GenericsType[]{new GenericsType(wrapTypeIfNecessary(itemType))});
}
}
return listType;
}
protected static boolean isNullConstant(final Expression expression) {
return expression instanceof ConstantExpression && ((ConstantExpression) expression).isNullExpression();
}
protected static boolean isThisExpression(final Expression expression) {
return expression instanceof VariableExpression && ((VariableExpression) expression).isThisExpression();
}
protected static boolean isSuperExpression(final Expression expression) {
return expression instanceof VariableExpression && ((VariableExpression) expression).isSuperExpression();
}
protected ClassNode inferMapExpressionType(final MapExpression map) {
ClassNode mapType = LinkedHashMap_TYPE.getPlainNodeReference();
List<MapEntryExpression> entryExpressions = map.getMapEntryExpressions();
int nExpressions = entryExpressions.size();
if (nExpressions == 0) return mapType;
GenericsType[] genericsTypes = mapType.getGenericsTypes();
if (genericsTypes == null
|| genericsTypes.length < 2
|| (genericsTypes.length == 2 && isObjectType(genericsTypes[0].getType()) && isObjectType(genericsTypes[1].getType()))) {
List<ClassNode> keyTypes = new ArrayList<>(nExpressions);
List<ClassNode> valueTypes = new ArrayList<>(nExpressions);
for (MapEntryExpression entryExpression : entryExpressions) {
keyTypes.add(getType(entryExpression.getKeyExpression()));
valueTypes.add(getType(entryExpression.getValueExpression()));
}
ClassNode keyType = lowestUpperBound(keyTypes);
ClassNode valueType = lowestUpperBound(valueTypes);
if (!isObjectType(keyType) || !isObjectType(valueType)) {
mapType = mapType.getPlainNodeReference();
mapType.setGenericsTypes(new GenericsType[]{new GenericsType(wrapTypeIfNecessary(keyType)), new GenericsType(wrapTypeIfNecessary(valueType))});
}
}
return mapType;
}
/**
* If a method call returns a parameterized type, then perform additional
* inference on the return type, so that the type gets actual type arguments.
* For example, the method {@code Arrays.asList(T...)} is parameterized with
* {@code T}, which can be deduced type arguments or call arguments.
*
* @param method the method node
* @param arguments the method call arguments
* @param receiver the object expression type
*/
protected ClassNode inferReturnTypeGenerics(final ClassNode receiver, final MethodNode method, final Expression arguments) {
return inferReturnTypeGenerics(receiver, method, arguments, null);
}
/**
* If a method call returns a parameterized type, then perform additional
* inference on the return type, so that the type gets actual type arguments.
* For example, the method {@code Arrays.asList(T...)} is parameterized with
* {@code T}, which can be deduced type arguments or call arguments.
*
* @param method the method node
* @param arguments the method call arguments
* @param receiver the object expression type
* @param explicitTypeHints type arguments (optional), for example {@code Collections.<String>emptyList()}
*/
protected ClassNode inferReturnTypeGenerics(final ClassNode receiver, final MethodNode method, final Expression arguments, final GenericsType[] explicitTypeHints) {
ClassNode returnType = method.isConstructor() ? method.getDeclaringClass() : method.getReturnType();
if (!GenericsUtils.hasUnresolvedGenerics(returnType)) {
// GROOVY-7538: replace "Type<?>" with "Type<? extends/super X>" for any "Type<T extends/super X>"
if (getGenericsWithoutArray(returnType) != null) returnType = boundUnboundedWildcards(returnType);
return returnType;
}
if (method instanceof ExtensionMethodNode) {
ArgumentListExpression args = getExtensionArguments(receiver, method, arguments);
MethodNode extension = ((ExtensionMethodNode) method).getExtensionMethodNode();
return inferReturnTypeGenerics(receiver, extension, args, explicitTypeHints);
}
Map<GenericsTypeName, GenericsType> context = method.isStatic() || method.isConstructor()
? null : extractPlaceHoldersVisibleToDeclaration(receiver, method, arguments);
GenericsType[] methodGenericTypes = method.isConstructor() ? method.getDeclaringClass().getGenericsTypes() : applyGenericsContext(context, method.getGenericsTypes());
// 1) resolve type parameters of method
if (methodGenericTypes != null) {
Map<GenericsTypeName, GenericsType> resolvedPlaceholders = new HashMap<>();
for (GenericsType gt : methodGenericTypes) resolvedPlaceholders.put(new GenericsTypeName(gt.getName()), gt);
applyGenericsConnections(extractGenericsConnectionsFromArguments(methodGenericTypes, Arrays.stream(method.getParameters()).map(param ->
new Parameter(applyGenericsContext(context, param.getType()), param.getName())
).toArray(Parameter[]::new), arguments, explicitTypeHints), resolvedPlaceholders);
returnType = applyGenericsContext(resolvedPlaceholders, returnType);
}
// 2) resolve type parameters of method's enclosing context
if (context != null) {
returnType = applyGenericsContext(context, returnType);
if (receiver.getGenericsTypes() == null && receiver.redirect().getGenericsTypes() != null
&& !receiver.isGenericsPlaceHolder() && GenericsUtils.hasUnresolvedGenerics(returnType)) {
returnType = returnType.getPlainNodeReference(); // GROOVY-10049: not "Stream<E>" for raw type
}
}
// 3) resolve bounds of type parameters from calling context
returnType = applyGenericsContext(extractGenericsParameterMapOfThis(typeCheckingContext), returnType);
return returnType;
}
/**
* Resolves type parameters declared by method from type or call arguments.
*/
private Map<GenericsTypeName, GenericsType> extractGenericsConnectionsFromArguments(final GenericsType[] methodGenericTypes, final Parameter[] parameters, final Expression arguments, final GenericsType[] explicitTypeHints) {
Map<GenericsTypeName, GenericsType> resolvedPlaceholders = new HashMap<>();
if (asBoolean(explicitTypeHints)) { // resolve type parameters from type arguments
int n = methodGenericTypes.length;
if (n == explicitTypeHints.length) {
for (int i = 0; i < n; i += 1) {
resolvedPlaceholders.put(new GenericsTypeName(methodGenericTypes[i].getName()), explicitTypeHints[i]);
}
}
} else if (parameters.length > 0) { // resolve type parameters from call arguments
List<Expression> expressions = InvocationWriter.makeArgumentList(arguments).getExpressions();
boolean isVargs = isVargs(parameters);
int nArguments = expressions.size();
int nParams = parameters.length;
if (isVargs ? nArguments >= nParams - 1 : nArguments == nParams) {
for (int i = 0; i < nArguments; i += 1) {
if (isNullConstant(expressions.get(i)))
continue; // GROOVY-9984: skip null
ClassNode paramType = parameters[Math.min(i, nParams - 1)].getType();
ClassNode argumentType = getDeclaredOrInferredType(expressions.get(i));
if (GenericsUtils.hasUnresolvedGenerics(paramType)) {
// if supplying array param with multiple arguments or single non-array argument, infer using element type
if (isVargs && (i >= nParams || (i == nParams - 1 && (nArguments > nParams || !argumentType.isArray())))) {
paramType = paramType.getComponentType();
}
if (isClosureWithType(argumentType)) {
MethodNode sam = findSAM(paramType);
if (sam != null) { // adapt closure to functional interface or other single-abstract-method class
argumentType = convertClosureTypeToSAMType(expressions.get(i), argumentType, sam, paramType);
}
}
Map<GenericsTypeName, GenericsType> connections = new HashMap<>();
extractGenericsConnections(connections, wrapTypeIfNecessary(argumentType), paramType);
connections.forEach((gtn, gt) -> resolvedPlaceholders.merge(gtn, gt, (gt1, gt2) -> {
// GROOVY-10339: incorporate another witness
return getCombinedGenericsType(gt1, gt2);
}));
}
}
}
// in case of "<T, U extends Type<T>>" we can learn about "T" from resolved "U"
Map<GenericsTypeName, GenericsType> connections = Arrays.stream(methodGenericTypes)
.collect(toMap(gt -> new GenericsTypeName(gt.getName()), gt -> gt, (v,x) -> v));
extractGenericsConnectionsForSuperClassAndInterfaces(connections, resolvedPlaceholders);
}
for (GenericsType gt : methodGenericTypes) {
// GROOVY-8409, GROOVY-10067, et al.: provide "no type witness" mapping for param
resolvedPlaceholders.computeIfAbsent(new GenericsTypeName(gt.getName()), gtn -> {
GenericsType xxx = new GenericsType(ClassHelper.makeWithoutCaching("#"),
applyGenericsContext(resolvedPlaceholders, gt.getUpperBounds()),
applyGenericsContext(resolvedPlaceholders, gt.getLowerBound()));
xxx.getType().setRedirect(gt.getType().redirect());
xxx.putNodeMetaData(GenericsType.class, gt);
xxx.setName("#" + gt.getName());
xxx.setPlaceholder(true);
return xxx;
});
}
return resolvedPlaceholders;
}
/**
* Given method call like "m(Collections.emptyList())", the type of the call
* argument is {@code List<T>} without explicit type arguments. Knowning the
* method target of "m", {@code T} could be resolved.
*/
private void resolvePlaceholdersFromImplicitTypeHints(final ClassNode[] actuals, final ArgumentListExpression argumentList, final Parameter[] parameterArray) {
int np = parameterArray.length;
for (int i = 0, n = actuals.length; np > 0 && i < n; i += 1) {
Expression a = argumentList.getExpression(i);
Parameter p = parameterArray[Math.min(i, np - 1)];
ClassNode at = actuals[i], pt = p.getOriginType();
if (!isUsingGenericsOrIsArrayUsingGenerics(pt)) continue;
if (i >= (np - 1) && pt.isArray() && !at.isArray()) pt = pt.getComponentType();
if (a instanceof ListExpression) {
actuals[i] = getLiteralResultType(pt, at, ArrayList_TYPE);
} else if (a instanceof MapExpression) {
actuals[i] = getLiteralResultType(pt, at, LinkedHashMap_TYPE);
} else if (a instanceof ConstructorCallExpression) {
inferDiamondType((ConstructorCallExpression) a, pt); // GROOVY-10086
} else if (a instanceof TernaryExpression && at.getGenericsTypes() != null && at.getGenericsTypes().length == 0) {
// GROOVY-9983: double diamond scenario -- "m(flag ? new Type<>(...) : new Type<>(...))"
typeCheckingContext.pushEnclosingBinaryExpression(assignX(varX(p), a, a));
a.visit(this); // re-visit with target type witness
typeCheckingContext.popEnclosingBinaryExpression();
actuals[i] = getType(a);
}
// check for method call without type arguments, with a known target
if (!(a instanceof MethodCall) || (a instanceof MethodCallExpression
&& ((MethodCallExpression) a).isUsingGenerics())) continue;
MethodNode aNode = a.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
if (aNode == null || aNode.getGenericsTypes() == null) continue;
// and unknown generics
if (!GenericsUtils.hasUnresolvedGenerics(at)) continue;
while (!at.equals(pt) && !isObjectType(at) && !isGenericsPlaceHolderOrArrayOf(at)) {
at = applyGenericsContext(GenericsUtils.extractPlaceholders(at), getNextSuperClass(at, pt));
}
// try to resolve placeholder(s) in argument type using parameter type
Map<GenericsTypeName, GenericsType> linked = new HashMap<>();
Map<GenericsTypeName, GenericsType> source = GenericsUtils.extractPlaceholders(at);
Map<GenericsTypeName, GenericsType> target = GenericsUtils.extractPlaceholders(pt);
if (at.isGenericsPlaceHolder()) // GROOVY-10482: call argument via "def <T> T m()"
target.put(new GenericsTypeName(at.getUnresolvedName()), pt.asGenericsType());
// connect E:T from source to E:Type from target
for (GenericsType placeholder : aNode.getGenericsTypes()) {
for (Map.Entry<GenericsTypeName, GenericsType> e : source.entrySet()) {
if (e.getValue().getNodeMetaData(GenericsType.class) == placeholder) {
Optional.ofNullable(target.get(e.getKey()))
// skip "f(g())" for "f(T<String>)" and "<U extends Number> U g()"
.filter(gt -> isAssignableTo(gt.getType(), placeholder.getType()))
.ifPresent(gt -> linked.put(new GenericsTypeName(e.getValue().getName()), gt));
break;
}
}
}
actuals[i] = applyGenericsContext(linked, at);
}
}
private static void extractGenericsConnectionsForSuperClassAndInterfaces(final Map<GenericsTypeName, GenericsType> resolvedPlaceholders, final Map<GenericsTypeName, GenericsType> connections) {
for (GenericsType value : new HashSet<>(connections.values())) {
if (!value.isPlaceholder() && !value.isWildcard()) {
ClassNode valueType = value.getType();
List<ClassNode> deepNodes = new LinkedList<>();
ClassNode unresolvedSuperClass = valueType.getUnresolvedSuperClass();
if (unresolvedSuperClass != null && unresolvedSuperClass.isUsingGenerics()) {
deepNodes.add(unresolvedSuperClass);
}
for (ClassNode node : valueType.getUnresolvedInterfaces()) {
if (node.isUsingGenerics()) {
deepNodes.add(node);
}
}
if (!deepNodes.isEmpty()) {
for (GenericsType genericsType : resolvedPlaceholders.values()) {
ClassNode lowerBound = genericsType.getLowerBound();
if (lowerBound != null) {
for (ClassNode deepNode : deepNodes) {
if (lowerBound.equals(deepNode)) {
extractGenericsConnections(connections, deepNode, lowerBound);
}
}
}
ClassNode[] upperBounds = genericsType.getUpperBounds();
if (upperBounds != null) {
for (ClassNode upperBound : upperBounds) {
for (ClassNode deepNode : deepNodes) {
if (upperBound.equals(deepNode)) {
extractGenericsConnections(connections, deepNode, upperBound);
}
}
}
}
}
}
}
}
}
/**
* Converts a Closure type to the appropriate SAM type, which can be used to
* infer return type generics.
*
* @param expression the argument expression
* @param closureType the inferred type of {@code expression}
* @param samType the target type for the argument expression
* @return SAM type augmented using information from the argument expression
*/
private static ClassNode convertClosureTypeToSAMType(final Expression expression, final ClassNode closureType, final MethodNode sam, final ClassNode samType) {
Map<GenericsTypeName, GenericsType> samTypeConnections = GenericsUtils.extractPlaceholders(samType);
samTypeConnections.replaceAll((xx, gt) -> // GROOVY-9762, GROOVY-9803: reduce "? super T" to "T"
Optional.ofNullable(gt.getLowerBound()).map(GenericsType::new).orElse(gt)
);
ClassNode closureReturnType = closureType.getGenericsTypes()[0].getType();
Parameter[] parameters = sam.getParameters();
if (parameters.length > 0
&& expression instanceof MethodPointerExpression
&& GenericsUtils.hasUnresolvedGenerics(closureReturnType)) {
// try to resolve referenced method type parameters in return type
MethodPointerExpression mp = (MethodPointerExpression) expression;
List<MethodNode> candidates = mp.getNodeMetaData(MethodNode.class);
if (candidates != null && !candidates.isEmpty()) {
ClassNode[] paramTypes = applyGenericsContext(samTypeConnections, extractTypesFromParameters(parameters));
ClassNode[] matchTypes = candidates.stream()
.map(candidate -> collateMethodReferenceParameterTypes(mp, candidate))
.filter(candidate -> checkSignatureSuitability(candidate, paramTypes))
.findFirst().orElse(null); // TODO: order signatures by param distance
if (matchTypes != null) {
Map<GenericsTypeName, GenericsType> connections = new HashMap<>();
for (int i = 0, n = parameters.length; i < n; i += 1) {
// SAM parameters should align with the referenced method's parameters
extractGenericsConnections(connections, paramTypes[i], matchTypes[i]);
}
// convert the method reference's generics into the SAM's generics domain
closureReturnType = applyGenericsContext(connections, closureReturnType);
// apply known generics connections to the SAM's placeholders in the return type
closureReturnType = applyGenericsContext(samTypeConnections, closureReturnType);
}
}
}
// the SAM's return type exactly corresponds to the inferred closure return type
extractGenericsConnections(samTypeConnections, closureReturnType, sam.getReturnType());
// repeat the same for each parameter given in the ClosureExpression
if (parameters.length > 0 && expression instanceof ClosureExpression) {
return closureType; // TODO
}
return applyGenericsContext(samTypeConnections, samType.redirect());
}
private static ClassNode[] collateMethodReferenceParameterTypes(final MethodPointerExpression source, final MethodNode target) {
Parameter[] params;
if (target instanceof ExtensionMethodNode && !((ExtensionMethodNode) target).isStaticExtension()) {
params = ((ExtensionMethodNode) target).getExtensionMethodNode().getParameters();
} else if (!target.isStatic() && source.getExpression() instanceof ClassExpression) {
ClassNode thisType = ((ClassExpression) source.getExpression()).getType();
// there is an implicit parameter for "String::length"
int n = target.getParameters().length;
params = new Parameter[n + 1];
params[0] = new Parameter(thisType, "");
System.arraycopy(target.getParameters(), 0, params, 1, n);
} else {
params = target.getParameters();
}
return extractTypesFromParameters(params);
}
private static boolean checkSignatureSuitability(final ClassNode[] receiverTypes, final ClassNode[] providerTypes) {
int n = receiverTypes.length;
if (n != providerTypes.length) {
return false;
}
for (int i = 0; i < n; i += 1) {
// for method closure, SAM parameters act like arguments
if (!isAssignableTo(providerTypes[i], receiverTypes[i])) {
return false;
}
}
return true;
}
private ClassNode getDeclaredOrInferredType(final Expression expression) {
ClassNode declaredOrInferred;
// in case of "T t = new ExtendsOrImplementsT()", return T for the expression type
if (expression instanceof Variable && !((Variable) expression).isDynamicTyped()) {
declaredOrInferred = getOriginalDeclarationType(expression); // GROOVY-9996
} else {
declaredOrInferred = getType(expression);
}
// GROOVY-10011: apply instanceof constraints to either option
return getInferredTypeFromTempInfo(expression, declaredOrInferred);
}
private static class ExtensionMethodDeclaringClass {
}
private static ArgumentListExpression getExtensionArguments(final ClassNode receiver, final MethodNode method, final Expression arguments) {
VariableExpression self = varX("$self", receiver); // implicit first argument
self.putNodeMetaData(ExtensionMethodDeclaringClass.class, method.getDeclaringClass());
ArgumentListExpression args = new ArgumentListExpression();
args.addExpression(self);
if (arguments instanceof TupleExpression) {
for (Expression argument : (TupleExpression) arguments) {
args.addExpression(argument);
}
} else {
args.addExpression(arguments);
}
return args;
}
private static boolean isGenericsPlaceHolderOrArrayOf(ClassNode cn) {
while (cn.isArray()) cn = cn.getComponentType();
return cn.isGenericsPlaceHolder();
}
private static Map<GenericsTypeName, GenericsType> extractPlaceHolders(final ClassNode receiver, final ClassNode declaringClass) {
Map<GenericsTypeName, GenericsType> result = null;
ClassNode[] todo;
if (receiver instanceof UnionTypeClassNode) {
todo = ((UnionTypeClassNode) receiver).getDelegates();
} else {
todo = new ClassNode[] {!isPrimitiveType(declaringClass) ? wrapTypeIfNecessary(receiver) : receiver};
}
for (ClassNode type : todo) {
for (ClassNode current = type; current != null; ) {
Map<GenericsTypeName, GenericsType> placeHolders = new HashMap<>();
if (current.isGenericsPlaceHolder())
// GROOVY-10622: type param bound "T extends Set<Type>"
current = current.asGenericsType().getUpperBounds()[0];
// GROOVY-10055: handle diamond or raw type
else if (current.getGenericsTypes() != null
? current.getGenericsTypes().length == 0
: current.redirect().getGenericsTypes() != null) {
for (GenericsType gt : current.redirect().getGenericsTypes()) {
ClassNode cn = gt.getUpperBounds() != null ? gt.getUpperBounds()[0] : gt.getType().redirect();
placeHolders.put(new GenericsTypeName(gt.getName()), cn.getPlainNodeReference().asGenericsType());
}
}
boolean currentIsDeclaring = current.equals(declaringClass) || isGenericsPlaceHolderOrArrayOf(declaringClass);
if (currentIsDeclaring) {
extractGenericsConnections(placeHolders, current, declaringClass);
} else {
GenericsUtils.extractPlaceholders(current, placeHolders);
}
if (result != null) { // merge maps
for (Map.Entry<GenericsTypeName, GenericsType> entry : placeHolders.entrySet()) {
GenericsType gt = entry.getValue();
if (!gt.isPlaceholder()) continue;
GenericsType referenced = result.get(new GenericsTypeName(gt.getName()));
if (referenced == null) continue;
entry.setValue(referenced);
}
}
result = placeHolders;
// we are done if we are now in the declaring class
if (currentIsDeclaring) break;
current = getNextSuperClass(current, declaringClass);
if (current == null && isClassType(declaringClass)) {
// this can happen if the receiver is Class<Foo>, then
// the actual receiver is Foo and declaringClass is Class
current = declaringClass;
} else {
current = applyGenericsContext(placeHolders, current);
}
}
}
if (result == null) {
throw new GroovyBugError("Declaring class " + prettyPrintTypeName(declaringClass) + " was not matched with receiver " + prettyPrintTypeName(receiver) + ". This should not have happened!");
}
return result;
}
private static Map<GenericsTypeName, GenericsType> extractPlaceHoldersVisibleToDeclaration(final ClassNode receiver, final MethodNode method, final Expression argument) {
Map<GenericsTypeName, GenericsType> result;
if (method.isStatic()) {
result = new HashMap<>();
} else {
ClassNode declaring = method.getDeclaringClass();
if (argument instanceof TupleExpression) { // resolve extension method class
List<Expression> arguments = ((TupleExpression) argument).getExpressions();
if (!arguments.isEmpty()) {
ClassNode cn = arguments.get(0).getNodeMetaData(ExtensionMethodDeclaringClass.class);
if (cn != null)
declaring = cn;
}
}
result = extractPlaceHolders(receiver, declaring);
if (!result.isEmpty()) Optional.ofNullable(method.getGenericsTypes()).ifPresent(methodGenerics ->
Arrays.stream(methodGenerics).map(gt -> new GenericsTypeName(gt.getName())).forEach(result::remove)); // GROOVY-10322
}
return result;
}
protected boolean typeCheckMethodsWithGenericsOrFail(final ClassNode receiver, final ClassNode[] arguments, final MethodNode candidateMethod, final Expression location) {
if (!typeCheckMethodsWithGenerics(receiver, arguments, candidateMethod)) {
ClassNode r = receiver, at[] = arguments; MethodNode m = candidateMethod;
if (candidateMethod instanceof ExtensionMethodNode) {
m = ((ExtensionMethodNode) candidateMethod).getExtensionMethodNode();
r = m.getDeclaringClass();
at = new ClassNode[arguments.length + 1];
at[0] = receiver; // object expression is first argument
System.arraycopy(arguments, 0, at, 1, arguments.length);
}
Map<GenericsTypeName, GenericsType> spec = extractPlaceHoldersVisibleToDeclaration(r, m, null);
GenericsType[] gt = applyGenericsContext(spec, m.getGenericsTypes()); // class params in bounds
GenericsUtils.extractPlaceholders(makeClassSafe0(OBJECT_TYPE, gt), spec);
Parameter[] parameters = m.getParameters();
ClassNode[] paramTypes = new ClassNode[parameters.length];
for (int i = 0, n = parameters.length; i < n; i += 1) {
paramTypes[i] = fullyResolveType(parameters[i].getType(), spec);
// GROOVY-10010: check for List<String> parameter and ["foo","$bar"] argument
if (i < at.length && hasGStringStringError(paramTypes[i], at[i], location)) {
return false;
}
}
addStaticTypeError("Cannot call " + (gt == null ? "" : GenericsUtils.toGenericTypesString(gt)) +
prettyPrintTypeName(r) + "#" + toMethodParametersString(m.getName(), paramTypes) + " with arguments " + formatArgumentList(at), location);
return false;
}
return true;
}
protected static String formatArgumentList(final ClassNode[] nodes) {
if (nodes == null || nodes.length == 0) return "[]";
StringJoiner joiner = new StringJoiner(", ", "[", "]");
for (ClassNode node : nodes) {
joiner.add(prettyPrintType(node));
}
return joiner.toString();
}
private static void putSetterInfo(final Expression exp, final SetterInfo info) {
exp.putNodeMetaData(SetterInfo.class, info);
}
private static SetterInfo removeSetterInfo(final Expression exp) {
Object nodeMetaData = exp.getNodeMetaData(SetterInfo.class);
if (nodeMetaData != null) {
exp.removeNodeMetaData(SetterInfo.class);
return (SetterInfo) nodeMetaData;
}
return null;
}
@Override
public void addError(final String msg, final ASTNode expr) {
Long err = ((long) expr.getLineNumber()) << 16 + expr.getColumnNumber();
if ((DEBUG_GENERATED_CODE && expr.getLineNumber() < 0) || !typeCheckingContext.reportedErrors.contains(err)) {
typeCheckingContext.getErrorCollector().addErrorAndContinue(msg + '\n', expr, getSourceUnit());
typeCheckingContext.reportedErrors.add(err);
}
}
protected void addStaticTypeError(final String msg, final ASTNode expr) {
if (expr.getColumnNumber() > 0 && expr.getLineNumber() > 0) {
addError(StaticTypesTransformation.STATIC_ERROR_PREFIX + msg, expr);
} else {
if (DEBUG_GENERATED_CODE) {
addError(StaticTypesTransformation.STATIC_ERROR_PREFIX + "Error in generated code [" + expr.getText() + "] - " + msg, expr);
}
// ignore errors which are related to unknown source locations
// because they are likely related to generated code
}
}
protected void addNoMatchingMethodError(ClassNode receiver, final String name, final ClassNode[] args, final Expression call) {
if (isClassClassNodeWrappingConcreteType(receiver)) {
receiver = receiver.getGenericsTypes()[0].getType();
}
addStaticTypeError("Cannot find matching method " + prettyPrintTypeName(receiver) + "#" + toMethodParametersString(name, args) + ". Please check if the declared type is correct and if the method exists.", call);
}
protected void addAmbiguousErrorMessage(final List<MethodNode> foundMethods, final String name, final ClassNode[] args, final Expression expr) {
addStaticTypeError("Reference to method is ambiguous. Cannot choose between " + prettyPrintMethodList(foundMethods), expr);
}
protected void addCategoryMethodCallError(final Expression call) {
addStaticTypeError("Due to their dynamic nature, usage of categories is not possible with static type checking active", call);
}
protected void addAssignmentError(final ClassNode leftType, final ClassNode rightType, final Expression expression) {
addStaticTypeError("Cannot assign value of type " + prettyPrintType(rightType) + " to variable of type " + prettyPrintType(leftType), expression);
}
protected void addUnsupportedPreOrPostfixExpressionError(final Expression expression) {
if (expression instanceof PostfixExpression) {
addStaticTypeError("Unsupported postfix operation type [" + ((PostfixExpression) expression).getOperation() + "]", expression);
} else if (expression instanceof PrefixExpression) {
addStaticTypeError("Unsupported prefix operation type [" + ((PrefixExpression) expression).getOperation() + "]", expression);
} else {
throw new IllegalArgumentException("Method should be called with a PostfixExpression or a PrefixExpression");
}
}
public void setMethodsToBeVisited(final Set<MethodNode> methodsToBeVisited) {
this.typeCheckingContext.methodsToBeVisited = methodsToBeVisited;
}
public void performSecondPass() {
for (SecondPassExpression<?> wrapper : typeCheckingContext.secondPassExpressions) {
Expression expression = wrapper.getExpression();
if (expression instanceof BinaryExpression) {
Expression left = ((BinaryExpression) expression).getLeftExpression();
if (left instanceof VariableExpression) {
Variable target = findTargetVariable((VariableExpression) left);
if (target instanceof VariableExpression) {
VariableExpression var = (VariableExpression) target;
List<ClassNode> classNodes = typeCheckingContext.closureSharedVariablesAssignmentTypes.get(var);
if (classNodes != null && classNodes.size() > 1) {
ClassNode lub = lowestUpperBound(classNodes);
String message = getOperationName(((BinaryExpression) expression).getOperation().getType());
if (message != null) {
List<MethodNode> method = findMethod(lub, message, getType(((BinaryExpression) expression).getRightExpression()));
if (method.isEmpty()) {
addStaticTypeError("A closure shared variable [" + target.getName() + "] has been assigned with various types and the method" +
" [" + toMethodParametersString(message, getType(((BinaryExpression) expression).getRightExpression())) + "]" +
" does not exist in the lowest upper bound of those types: [" +
prettyPrintType(lub) + "]. In general, this is a bad practice (variable reuse) because the compiler cannot" +
" determine safely what is the type of the variable at the moment of the call in a multithreaded context.", expression);
}
}
}
}
}
} else if (expression instanceof MethodCallExpression) {
MethodCallExpression call = (MethodCallExpression) expression;
Expression objectExpression = call.getObjectExpression();
if (objectExpression instanceof VariableExpression) {
// this should always be the case, but adding a test is safer
Variable target = findTargetVariable((VariableExpression) objectExpression);
if (target instanceof VariableExpression) {
VariableExpression var = (VariableExpression) target;
List<ClassNode> classNodes = typeCheckingContext.closureSharedVariablesAssignmentTypes.get(var);
if (classNodes != null && classNodes.size() > 1) {
ClassNode lub = lowestUpperBound(classNodes);
MethodNode methodNode = call.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
// we must check that such a method exists on the LUB
Parameter[] parameters = methodNode.getParameters();
ClassNode[] params = extractTypesFromParameters(parameters);
ClassNode[] argTypes = (ClassNode[]) wrapper.getData();
List<MethodNode> method = findMethod(lub, methodNode.getName(), argTypes);
if (method.size() != 1) {
addStaticTypeError("A closure shared variable [" + target.getName() + "] has been assigned with various types and the method" +
" [" + toMethodParametersString(methodNode.getName(), params) + "]" +
" does not exist in the lowest upper bound of those types: [" +
prettyPrintType(lub) + "]. In general, this is a bad practice (variable reuse) because the compiler cannot" +
" determine safely what is the type of the variable at the moment of the call in a multithreaded context.", call);
}
}
}
}
}
}
// give a chance to type checker extensions to throw errors based on information gathered afterwards
extension.finish();
}
protected static ClassNode[] extractTypesFromParameters(final Parameter[] parameters) {
return Arrays.stream(parameters).map(Parameter::getType).toArray(ClassNode[]::new);
}
/**
* Returns a wrapped type if, and only if, the provided class node is a primitive type.
* This method differs from {@link ClassHelper#getWrapper(org.codehaus.groovy.ast.ClassNode)} as it will
* return the same instance if the provided type is not a generic type.
*
* @return the wrapped type
*/
protected static ClassNode wrapTypeIfNecessary(final ClassNode type) {
return (type != null && isPrimitiveType(type) ? getWrapper(type) : type);
}
protected static boolean isClassInnerClassOrEqualTo(final ClassNode toBeChecked, final ClassNode start) {
if (start == toBeChecked) return true;
ClassNode outer = start.getOuterClass();
if (outer != null) {
return isClassInnerClassOrEqualTo(toBeChecked, outer);
}
return false;
}
private static boolean isNonStaticHelperMethod(final MethodNode method) {
Parameter[] parameters = method.getParameters(); // check first param is "$self"
if (parameters.length > 0 && parameters[0].getName().equals(Traits.THIS_OBJECT)) {
return !method.getName().contains("$init$") && Traits.isTrait(method.getDeclaringClass().getOuterClass());
}
return false;
}
private static BinaryExpression assignX(final Expression lhs, final Expression rhs, final ASTNode pos) {
BinaryExpression exp = (BinaryExpression) GeneralUtils.assignX(lhs, rhs);
exp.setSourcePosition(pos);
return exp;
}
//--------------------------------------------------------------------------
public static class SignatureCodecFactory {
public static SignatureCodec getCodec(final int version, final ClassLoader classLoader) {
switch (version) {
case 1:
return new SignatureCodecVersion1(classLoader);
default:
return null;
}
}
}
// class only used to store setter information when an expression of type
// a.x = foo or x=foo is found and that it corresponds to a setter call
private static class SetterInfo {
final ClassNode receiverType;
final String name;
final List<MethodNode> setters;
private SetterInfo(final ClassNode receiverType, final String name, final List<MethodNode> setters) {
this.receiverType = receiverType;
this.setters = setters;
this.name = name;
}
}
/**
* Wrapper for a Parameter so it can be treated like a VariableExpression
* and tracked in the {@code ifElseForWhileAssignmentTracker}.
*/
private class ParameterVariableExpression extends VariableExpression {
private final Parameter parameter;
ParameterVariableExpression(final Parameter parameter) {
super(parameter);
this.parameter = parameter;
ClassNode inferredType = getNodeMetaData(INFERRED_TYPE);
if (inferredType == null) {
inferredType = typeCheckingContext.controlStructureVariables.get(parameter); // for/catch/closure
if (inferredType == null) {
inferredType = getTypeFromClosureArguments(parameter); // @ClosureParams or SAM-type coercion
}
setNodeMetaData(INFERRED_TYPE, inferredType != null ? inferredType : parameter.getType()); // GROOVY-10651
}
}
@Override
public Map<?, ?> getMetaDataMap() {
return parameter.getMetaDataMap();
}
@Override
public void setMetaDataMap(final Map<?, ?> metaDataMap) {
parameter.setMetaDataMap(metaDataMap);
}
}
protected class VariableExpressionTypeMemoizer extends ClassCodeVisitorSupport {
private final boolean onlySharedVariables;
private final Map<VariableExpression, ClassNode> varOrigType;
public VariableExpressionTypeMemoizer(final Map<VariableExpression, ClassNode> varOrigType) {
this(varOrigType, false);
}
public VariableExpressionTypeMemoizer(final Map<VariableExpression, ClassNode> varOrigType, final boolean onlySharedVariables) {
this.varOrigType = varOrigType;
this.onlySharedVariables = onlySharedVariables;
}
@Override
protected SourceUnit getSourceUnit() {
return StaticTypeCheckingVisitor.this.getSourceUnit();
}
@Override
public void visitVariableExpression(final VariableExpression expression) {
Variable var = findTargetVariable(expression);
if ((!onlySharedVariables || var.isClosureSharedVariable()) && var instanceof VariableExpression) {
VariableExpression ve = (VariableExpression) var;
ClassNode cn = ve.getNodeMetaData(INFERRED_TYPE);
if (cn == null) cn = ve.getOriginType();
varOrigType.put(ve, cn);
}
super.visitVariableExpression(expression);
}
}
}