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Eclipse Compiler for Java(TM)
/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contributions for
* bug 186342 - [compiler][null] Using annotations for null checking
* bug 392099 - [1.8][compiler][null] Apply null annotation on types for null analysis
* bug 392384 - [1.8][compiler][null] Restore nullness info from type annotations in class files
* Bug 415043 - [1.8][null] Follow-up re null type annotations after bug 392099
* Bug 417295 - [1.8[[null] Massage type annotated null analysis to gel well with deep encoded type bindings.
* Bug 425152 - [1.8] [compiler] Lambda Expression not resolved but flow analyzed leading to NPE.
* Bug 429958 - [1.8][null] evaluate new DefaultLocation attribute of @NonNullByDefault
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import org.eclipse.jdt.internal.compiler.ast.NullAnnotationMatching;
import org.eclipse.jdt.internal.compiler.ast.Wildcard;
/**
* Binding denoting a method after type parameter substitutions got performed.
* On parameterized type bindings, all methods got substituted, regardless whether
* their signature did involve generics or not, so as to get the proper declaringClass for
* these methods.
*/
public class ParameterizedMethodBinding extends MethodBinding {
protected MethodBinding originalMethod;
/**
* Create method of parameterized type, substituting original parameters/exception/return type with type arguments.
*/
public ParameterizedMethodBinding(final ParameterizedTypeBinding parameterizedDeclaringClass, MethodBinding originalMethod) {
super(
originalMethod.modifiers,
originalMethod.selector,
originalMethod.returnType,
originalMethod.parameters,
originalMethod.thrownExceptions,
parameterizedDeclaringClass);
this.originalMethod = originalMethod;
/* missing type bit cannot be copied as is it might come from the return type or a parameter type that
* is substituted by a raw type.
*/
this.tagBits = originalMethod.tagBits & ~TagBits.HasMissingType;
this.parameterFlowBits = originalMethod.parameterFlowBits;
this.defaultNullness = originalMethod.defaultNullness;
final TypeVariableBinding[] originalVariables = originalMethod.typeVariables;
Substitution substitution = null;
final int length = originalVariables.length;
final boolean isStatic = originalMethod.isStatic();
if (length == 0) {
this.typeVariables = Binding.NO_TYPE_VARIABLES;
if (!isStatic) substitution = parameterizedDeclaringClass;
} else {
// at least fix up the declaringElement binding + bound substitution if non static
final TypeVariableBinding[] substitutedVariables = new TypeVariableBinding[length];
for (int i = 0; i < length; i++) { // copy original type variable to relocate
TypeVariableBinding originalVariable = originalVariables[i];
substitutedVariables[i] = new TypeVariableBinding(originalVariable.sourceName, this, originalVariable.rank, parameterizedDeclaringClass.environment);
substitutedVariables[i].tagBits |= (originalVariable.tagBits & (TagBits.AnnotationNullMASK|TagBits.HasNullTypeAnnotation));
}
this.typeVariables = substitutedVariables;
// need to substitute old var refs with new ones (double substitution: declaringClass + new type variables)
substitution = new Substitution() {
@Override
public LookupEnvironment environment() {
return parameterizedDeclaringClass.environment;
}
@Override
public boolean isRawSubstitution() {
return !isStatic && parameterizedDeclaringClass.isRawSubstitution();
}
@Override
public TypeBinding substitute(TypeVariableBinding typeVariable) {
// check this variable can be substituted given copied variables
if (typeVariable.rank < length && TypeBinding.equalsEquals(originalVariables[typeVariable.rank], typeVariable)) {
TypeBinding substitute = substitutedVariables[typeVariable.rank];
return typeVariable.hasTypeAnnotations() ? environment().createAnnotatedType(substitute, typeVariable.getTypeAnnotations()) : substitute;
}
if (!isStatic)
return parameterizedDeclaringClass.substitute(typeVariable);
return typeVariable;
}
};
// initialize new variable bounds
for (int i = 0; i < length; i++) {
TypeVariableBinding originalVariable = originalVariables[i];
TypeVariableBinding substitutedVariable = substitutedVariables[i];
TypeBinding substitutedSuperclass = Scope.substitute(substitution, originalVariable.superclass);
ReferenceBinding[] substitutedInterfaces = Scope.substitute(substitution, originalVariable.superInterfaces);
if (originalVariable.firstBound != null) {
TypeBinding firstBound;
firstBound = TypeBinding.equalsEquals(originalVariable.firstBound, originalVariable.superclass)
? substitutedSuperclass // could be array type or interface
: substitutedInterfaces[0];
substitutedVariable.setFirstBound(firstBound);
}
switch (substitutedSuperclass.kind()) {
case Binding.ARRAY_TYPE :
substitutedVariable.setSuperClass(parameterizedDeclaringClass.environment.getResolvedJavaBaseType(TypeConstants.JAVA_LANG_OBJECT, null));
substitutedVariable.setSuperInterfaces(substitutedInterfaces);
break;
default:
if (substitutedSuperclass.isInterface()) {
substitutedVariable.setSuperClass(parameterizedDeclaringClass.environment.getResolvedType(TypeConstants.JAVA_LANG_OBJECT, null));
int interfaceCount = substitutedInterfaces.length;
System.arraycopy(substitutedInterfaces, 0, substitutedInterfaces = new ReferenceBinding[interfaceCount+1], 1, interfaceCount);
substitutedInterfaces[0] = (ReferenceBinding) substitutedSuperclass;
substitutedVariable.setSuperInterfaces(substitutedInterfaces);
} else {
substitutedVariable.setSuperClass((ReferenceBinding) substitutedSuperclass); // typeVar was extending other typeVar which got substituted with interface
substitutedVariable.setSuperInterfaces(substitutedInterfaces);
}
}
}
}
if (substitution != null) {
this.returnType = Scope.substitute(substitution, this.returnType);
this.parameters = Scope.substitute(substitution, this.parameters);
this.thrownExceptions = Scope.substitute(substitution, this.thrownExceptions);
// error case where exception type variable would have been substituted by a non-reference type (207573)
if (this.thrownExceptions == null) this.thrownExceptions = Binding.NO_EXCEPTIONS;
// after substitution transfer nullness information from type annotations:
if (parameterizedDeclaringClass.environment.globalOptions.isAnnotationBasedNullAnalysisEnabled) {
long returnNullBits = NullAnnotationMatching.validNullTagBits(this.returnType.tagBits);
if (returnNullBits != 0L) {
this.tagBits &= ~TagBits.AnnotationNullMASK;
this.tagBits |= returnNullBits;
}
int parametersLen = this.parameters.length;
for (int i=0; i'} into: {@code 'Class}
*/
public static ParameterizedMethodBinding instantiateGetClass(TypeBinding receiverType, MethodBinding originalMethod, Scope scope) {
ParameterizedMethodBinding method = new ParameterizedMethodBinding();
method.modifiers = originalMethod.modifiers;
method.selector = originalMethod.selector;
method.declaringClass = originalMethod.declaringClass;
method.typeVariables = Binding.NO_TYPE_VARIABLES;
method.originalMethod = originalMethod;
method.parameters = originalMethod.parameters;
method.thrownExceptions = originalMethod.thrownExceptions;
method.tagBits = originalMethod.tagBits;
ReferenceBinding genericClassType = scope.getJavaLangClass();
LookupEnvironment environment = scope.environment();
TypeBinding rawType = environment.convertToRawType(receiverType.erasure(), false /*do not force conversion of enclosing types*/);
if (environment.usesNullTypeAnnotations())
rawType = environment.createNonNullAnnotatedType(rawType);
method.returnType = environment.createParameterizedType(
genericClassType,
new TypeBinding[] { environment.createWildcard(genericClassType, 0, rawType, null /*no extra bound*/, Wildcard.EXTENDS) },
null);
if (environment.globalOptions.isAnnotationBasedNullAnalysisEnabled) {
if (environment.usesNullTypeAnnotations())
method.returnType = environment.createNonNullAnnotatedType(method.returnType);
else
method.tagBits |= TagBits.AnnotationNonNull;
}
if ((method.returnType.tagBits & TagBits.HasMissingType) != 0) {
method.tagBits |= TagBits.HasMissingType;
}
return method;
}
/**
* Returns true if some parameters got substituted.
*/
@Override
public boolean hasSubstitutedParameters() {
return this.parameters != this.originalMethod.parameters;
}
/**
* Returns true if the return type got substituted.
*/
@Override
public boolean hasSubstitutedReturnType() {
return this.returnType != this.originalMethod.returnType; //$IDENTITY-COMPARISON$
}
/**
* Returns the original method (as opposed to parameterized instances)
*/
@Override
public MethodBinding original() {
return this.originalMethod.original();
}
@Override
public MethodBinding shallowOriginal() {
return this.originalMethod;
}
}