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org.eclipse.jdt.internal.compiler.lookup.WildcardBinding Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2005, 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 - Contribution for
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 359362 - FUP of bug 349326: Resource leak on non-Closeable resource
* bug 358903 - Filter practically unimportant resource leak warnings
* Bug 417295 - [1.8[[null] Massage type annotated null analysis to gel well with deep encoded type bindings.
* Bug 400874 - [1.8][compiler] Inference infrastructure should evolve to meet JLS8 18.x (Part G of JSR335 spec)
* Bug 423504 - [1.8] Implement "18.5.3 Functional Interface Parameterization Inference"
* Bug 426676 - [1.8][compiler] Wrong generic method type inferred from lambda expression
* Bug 427411 - [1.8][generics] JDT reports type mismatch when using method that returns generic type
* Bug 428019 - [1.8][compiler] Type inference failure with nested generic invocation.
* Bug 435962 - [RC2] StackOverFlowError when building
* Bug 438458 - [1.8][null] clean up handling of null type annotations wrt type variables
* Bug 440759 - [1.8][null] @NonNullByDefault should never affect wildcards and uses of a type variable
* Bug 441693 - [1.8][null] Bogus warning for type argument annotated with @NonNull
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import java.util.List;
import java.util.Set;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Wildcard;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
/*
* A wildcard acts as an argument for parameterized types, allowing to
* abstract parameterized types, e.g. List is not compatible with List,
* but compatible with List.
*/
public class WildcardBinding extends ReferenceBinding {
public ReferenceBinding genericType;
public int rank;
public TypeBinding bound; // when unbound denotes the corresponding type variable (so as to retrieve its bound lazily)
public TypeBinding[] otherBounds; // only positionned by lub computations (if so, #bound is also set) and associated to EXTENDS mode
char[] genericSignature;
public int boundKind;
ReferenceBinding superclass;
ReferenceBinding[] superInterfaces;
TypeVariableBinding typeVariable; // corresponding variable
LookupEnvironment environment;
/**
* When unbound, the bound denotes the corresponding type variable (so as to retrieve its bound lazily)
*/
public WildcardBinding(ReferenceBinding genericType, int rank, TypeBinding bound, TypeBinding[] otherBounds, int boundKind, LookupEnvironment environment) {
this.rank = rank;
this.boundKind = boundKind;
this.modifiers = ClassFileConstants.AccPublic | ExtraCompilerModifiers.AccGenericSignature; // treat wildcard as public
this.environment = environment;
initialize(genericType, bound, otherBounds);
if (genericType instanceof UnresolvedReferenceBinding)
((UnresolvedReferenceBinding) genericType).addWrapper(this, environment);
if (bound instanceof UnresolvedReferenceBinding)
((UnresolvedReferenceBinding) bound).addWrapper(this, environment);
this.tagBits |= TagBits.HasUnresolvedTypeVariables; // cleared in resolve()
this.typeBits = TypeIds.BitUninitialized;
}
@Override
TypeBinding bound() {
return this.bound;
}
@Override
int boundKind() {
return this.boundKind;
}
public TypeBinding allBounds() {
if (this.otherBounds == null || this.otherBounds.length == 0)
return this.bound;
ReferenceBinding[] allBounds = new ReferenceBinding[this.otherBounds.length+1];
try {
allBounds[0] = (ReferenceBinding) this.bound;
System.arraycopy(this.otherBounds, 0, allBounds, 1, this.otherBounds.length);
} catch (ClassCastException | ArrayStoreException ase) {
return this.bound;
}
return this.environment.createIntersectionType18(allBounds);
}
@Override
public void setTypeAnnotations(AnnotationBinding[] annotations, boolean evalNullAnnotations) {
this.tagBits |= TagBits.HasTypeAnnotations;
if (annotations != null && annotations.length != 0) {
this.typeAnnotations = annotations;
}
if (evalNullAnnotations) {
evaluateNullAnnotations(null, null);
}
}
/**
* evaluate null type annotations and check / copy nullTagBits from bound and typevariable.
* may be invoked repeatedly.
* @param scope (may be null, if wildcard is null)
* @param wildcard (may be null. if non-null, errors are reported and type annotations are dropped from this.bound in case of conflicts.)
*/
public void evaluateNullAnnotations(Scope scope, Wildcard wildcard) {
long nullTagBits = determineNullBitsFromDeclaration(scope, wildcard);
if (nullTagBits == 0L) {
TypeVariableBinding typeVariable2 = typeVariable();
if (typeVariable2 != null) {
long typeVariableNullTagBits = typeVariable2.tagBits & TagBits.AnnotationNullMASK;
if (typeVariableNullTagBits != 0L) {
nullTagBits = typeVariableNullTagBits;
}
}
}
if (nullTagBits != 0)
this.tagBits = (this.tagBits & ~TagBits.AnnotationNullMASK) | nullTagBits | TagBits.HasNullTypeAnnotation;
}
/**
* compute the nullTagBits from type annotations and bound.
* @param scope (may be null, if wildcard is null)
* @param wildcard (may be null. if non-null, errors are reported and type annotations are dropped from this.bound in case of conflicts.)
*/
public long determineNullBitsFromDeclaration(Scope scope, Wildcard wildcard) {
long nullTagBits = 0L;
AnnotationBinding [] annotations = this.typeAnnotations;
if (annotations != null) {
for (int i = 0, length = annotations.length; i < length; i++) {
AnnotationBinding annotation = annotations[i];
if (annotation != null) {
if (annotation.type.hasNullBit(TypeIds.BitNullableAnnotation)) {
if ((nullTagBits & TagBits.AnnotationNonNull) == 0) {
nullTagBits |= TagBits.AnnotationNullable;
} else {
if (wildcard != null) {
Annotation annotation1 = wildcard.findAnnotation(TagBits.AnnotationNullable);
if (annotation1 != null)
scope.problemReporter().contradictoryNullAnnotations(annotation1);
}
}
} else if (annotation.type.hasNullBit(TypeIds.BitNonNullAnnotation)) {
if ((nullTagBits & TagBits.AnnotationNullable) == 0) {
nullTagBits |= TagBits.AnnotationNonNull;
} else {
if (wildcard != null) {
Annotation annotation1 = wildcard.findAnnotation(TagBits.AnnotationNonNull);
if (annotation1 != null)
scope.problemReporter().contradictoryNullAnnotations(annotation1);
}
}
}
}
}
}
if (this.bound != null && this.bound.isValidBinding()) {
long boundNullTagBits = this.bound.tagBits & TagBits.AnnotationNullMASK;
if (boundNullTagBits != 0L) {
if (this.boundKind == Wildcard.SUPER) {
if ((boundNullTagBits & TagBits.AnnotationNullable) != 0) {
if (nullTagBits == 0L) {
nullTagBits = TagBits.AnnotationNullable;
} else if (wildcard != null && (nullTagBits & TagBits.AnnotationNonNull) != 0) {
Annotation annotation = wildcard.bound.findAnnotation(boundNullTagBits);
if (annotation == null) { // false alarm, implicit annotation is no conflict, but should be removed:
// may not be reachable, how could we have an implicit @Nullable (not via @NonNullByDefault)?
TypeBinding newBound = this.bound.withoutToplevelNullAnnotation();
this.bound = newBound;
wildcard.bound.resolvedType = newBound;
} else {
scope.problemReporter().contradictoryNullAnnotationsOnBounds(annotation, nullTagBits);
}
}
}
} else {
if ((boundNullTagBits & TagBits.AnnotationNonNull) != 0) {
if (nullTagBits == 0L) {
nullTagBits = TagBits.AnnotationNonNull;
} else if (wildcard != null && (nullTagBits & TagBits.AnnotationNullable) != 0) {
Annotation annotation = wildcard.bound.findAnnotation(boundNullTagBits);
if (annotation == null) { // false alarm, implicit annotation is no conflict, but should be removed:
TypeBinding newBound = this.bound.withoutToplevelNullAnnotation();
this.bound = newBound;
wildcard.bound.resolvedType = newBound;
} else {
scope.problemReporter().contradictoryNullAnnotationsOnBounds(annotation, nullTagBits);
}
}
}
if (nullTagBits == 0L && this.otherBounds != null) {
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
if ((this.otherBounds[i].tagBits & TagBits.AnnotationNonNull) != 0) { // can this happen?
nullTagBits = TagBits.AnnotationNonNull;
break;
}
}
}
}
}
}
return nullTagBits;
}
@Override
public ReferenceBinding actualType() {
return this.genericType;
}
@Override
TypeBinding[] additionalBounds() {
return this.otherBounds;
}
@Override
public int kind() {
return this.otherBounds == null ? Binding.WILDCARD_TYPE : Binding.INTERSECTION_TYPE;
}
/**
* Returns true if the argument type satisfies the wildcard bound(s)
*/
public boolean boundCheck(TypeBinding argumentType) {
switch (this.boundKind) {
case Wildcard.UNBOUND :
return true;
case Wildcard.EXTENDS :
if (!argumentType.isCompatibleWith(this.bound)) return false;
// check other bounds (lub scenario)
for (int i = 0, length = this.otherBounds == null ? 0 : this.otherBounds.length; i < length; i++) {
if (!argumentType.isCompatibleWith(this.otherBounds[i])) return false;
}
return true;
default: // SUPER
// ? super Exception ok for: IOException, since it would be ok for (Exception)ioException
return argumentType.isCompatibleWith(this.bound);
}
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding#canBeInstantiated()
*/
@Override
public boolean canBeInstantiated() {
// cannot be asked per construction
return false;
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#collectMissingTypes(java.util.List)
*/
@Override
public List collectMissingTypes(List missingTypes) {
if ((this.tagBits & TagBits.HasMissingType) != 0) {
missingTypes = this.bound.collectMissingTypes(missingTypes);
}
return missingTypes;
}
/**
* Collect the substitutes into a map for certain type variables inside the receiver type
* e.g. {@code Collection.collectSubstitutes(Collection>, Map)} will populate Map with: {@code T --> List}
* Constraints:
* {@code
* A << F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EXTENDS (1))
* A = F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EQUAL (0))
* A >> F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_SUPER (2))
* }
*/
@Override
public void collectSubstitutes(Scope scope, TypeBinding actualType, InferenceContext inferenceContext, int constraint) {
if ((this.tagBits & TagBits.HasTypeVariable) == 0) return;
if (actualType == TypeBinding.NULL || actualType.kind() == POLY_TYPE) return;
if (actualType.isCapture()) {
CaptureBinding capture = (CaptureBinding) actualType;
actualType = capture.wildcard;
// this method should only be called in 1.7- inference, hence we don't expect to see CaptureBinding18 here.
}
switch (constraint) {
case TypeConstants.CONSTRAINT_EXTENDS : // A << F
switch (this.boundKind) {
case Wildcard.UNBOUND: // F={?}
// switch (actualType.kind()) {
// case Binding.WILDCARD_TYPE :
// WildcardBinding actualWildcard = (WildcardBinding) actualType;
// switch(actualWildcard.kind) {
// case Wildcard.UNBOUND: // A={?} << F={?} --> 0
// break;
// case Wildcard.EXTENDS: // A={? extends V} << F={?} ---> 0
// break;
// case Wildcard.SUPER: // A={? super V} << F={?} ---> 0
// break;
// }
// break;
// case Binding.INTERSECTION_TYPE :// A={? extends V1&...&Vn} << F={?} ---> 0
// break;
// default :// A=V << F={?} ---> 0
// break;
// }
break;
case Wildcard.EXTENDS: // F={? extends U}
switch(actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} << F={? extends U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} << F={? extends U} ---> V << U
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_EXTENDS);
break;
case Wildcard.SUPER: // A={? super V} << F={? extends U} ---> 0
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} << F={? extends U} ---> V1 << U, ..., Vn << U
WildcardBinding actualIntersection = (WildcardBinding) actualType;
this.bound.collectSubstitutes(scope, actualIntersection.bound, inferenceContext, TypeConstants.CONSTRAINT_EXTENDS);
for (int i = 0, length = actualIntersection.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualIntersection.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_EXTENDS);
}
break;
default : // A=V << F={? extends U} ---> V << U
this.bound.collectSubstitutes(scope, actualType, inferenceContext, TypeConstants.CONSTRAINT_EXTENDS);
break;
}
break;
case Wildcard.SUPER: // F={? super U}
switch (actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} << F={? super U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} << F={? super U} ---> 0
break;
case Wildcard.SUPER: // A={? super V} << F={? super U} ---> 0
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_SUPER);
for (int i = 0, length = actualWildcard.otherBounds == null ? 0 : actualWildcard.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualWildcard.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_SUPER);
}
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} << F={? super U} ---> 0
break;
default :// A=V << F={? super U} ---> V >> U
this.bound.collectSubstitutes(scope, actualType, inferenceContext, TypeConstants.CONSTRAINT_SUPER);
break;
}
break;
}
break;
case TypeConstants.CONSTRAINT_EQUAL : // A == F
switch (this.boundKind) {
case Wildcard.UNBOUND: // F={?}
// switch (actualType.kind()) {
// case Binding.WILDCARD_TYPE :
// WildcardBinding actualWildcard = (WildcardBinding) actualType;
// switch(actualWildcard.kind) {
// case Wildcard.UNBOUND: // A={?} == F={?} --> 0
// break;
// case Wildcard.EXTENDS: // A={? extends V} == F={?} ---> 0
// break;
// case Wildcard.SUPER: // A={? super V} == F={?} ---> 0
// break;
// }
// break;
// case Binding.INTERSECTION_TYPE :// A={? extends V1&...&Vn} == F={?} ---> 0
// break;
// default :// A=V == F={?} ---> 0
// break;
// }
break;
case Wildcard.EXTENDS: // F={? extends U}
switch (actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} == F={? extends U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} == F={? extends U} ---> V == U
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
for (int i = 0, length = actualWildcard.otherBounds == null ? 0 : actualWildcard.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualWildcard.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
}
break;
case Wildcard.SUPER: // A={? super V} == F={? extends U} ---> 0
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} == F={? extends U} ---> V1 == U, ..., Vn == U
WildcardBinding actuaIntersection = (WildcardBinding) actualType;
this.bound.collectSubstitutes(scope, actuaIntersection.bound, inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
for (int i = 0, length = actuaIntersection.otherBounds == null ? 0 : actuaIntersection.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actuaIntersection.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
}
break;
default : // A=V == F={? extends U} ---> 0
break;
}
break;
case Wildcard.SUPER: // F={? super U}
switch (actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} == F={? super U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} == F={? super U} ---> 0
break;
case Wildcard.SUPER: // A={? super V} == F={? super U} ---> 0
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
for (int i = 0, length = actualWildcard.otherBounds == null ? 0 : actualWildcard.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualWildcard.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_EQUAL);
}
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} == F={? super U} ---> 0
break;
default : // A=V == F={? super U} ---> 0
break;
}
break;
}
break;
case TypeConstants.CONSTRAINT_SUPER : // A >> F
switch (this.boundKind) {
case Wildcard.UNBOUND: // F={?}
// switch (actualType.kind()) {
// case Binding.WILDCARD_TYPE :
// WildcardBinding actualWildcard = (WildcardBinding) actualType;
// switch(actualWildcard.kind) {
// case Wildcard.UNBOUND: // A={?} >> F={?} --> 0
// break;
// case Wildcard.EXTENDS: // A={? extends V} >> F={?} ---> 0
// break;
// case Wildcard.SUPER: // A={? super V} >> F={?} ---> 0
// break;
// }
// break;
// case Binding.INTERSECTION_TYPE :// A={? extends V1&...&Vn} >> F={?} ---> 0
// break;
// default :// A=V >> F={?} ---> 0
// break;
// }
break;
case Wildcard.EXTENDS: // F={? extends U}
switch (actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} >> F={? extends U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} >> F={? extends U} ---> V >> U
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_SUPER);
for (int i = 0, length = actualWildcard.otherBounds == null ? 0 : actualWildcard.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualWildcard.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_SUPER);
}
break;
case Wildcard.SUPER: // A={? super V} >> F={? extends U} ---> 0
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} >> F={? extends U} ---> V1 >> U, ..., Vn >> U
WildcardBinding actualIntersection = (WildcardBinding) actualType;
this.bound.collectSubstitutes(scope, actualIntersection.bound, inferenceContext, TypeConstants.CONSTRAINT_SUPER);
for (int i = 0, length = actualIntersection.otherBounds == null ? 0 : actualIntersection.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualIntersection.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_SUPER);
}
break;
default : // A=V == F={? extends U} ---> 0
break;
}
break;
case Wildcard.SUPER: // F={? super U}
switch (actualType.kind()) {
case Binding.WILDCARD_TYPE :
WildcardBinding actualWildcard = (WildcardBinding) actualType;
switch(actualWildcard.boundKind) {
case Wildcard.UNBOUND: // A={?} >> F={? super U} --> 0
break;
case Wildcard.EXTENDS: // A={? extends V} >> F={? super U} ---> 0
break;
case Wildcard.SUPER: // A={? super V} >> F={? super U} ---> V >> U
this.bound.collectSubstitutes(scope, actualWildcard.bound, inferenceContext, TypeConstants.CONSTRAINT_SUPER);
for (int i = 0, length = actualWildcard.otherBounds == null ? 0 : actualWildcard.otherBounds.length; i < length; i++) {
this.bound.collectSubstitutes(scope, actualWildcard.otherBounds[i], inferenceContext, TypeConstants.CONSTRAINT_SUPER);
}
break;
}
break;
case Binding.INTERSECTION_TYPE : // A={? extends V1&...&Vn} >> F={? super U} ---> 0
break;
default : // A=V >> F={? super U} ---> 0
break;
}
break;
}
break;
}
}
/*
* genericTypeKey {rank}*|+|- [boundKey]
* p.X { X ... } --> Lp/X;{0}*
*/
@Override
public char[] computeUniqueKey(boolean isLeaf) {
char[] genericTypeKey = this.genericType.computeUniqueKey(false/*not a leaf*/);
char[] wildCardKey;
// We now encode the rank also in the binding key - https://bugs.eclipse.org/bugs/show_bug.cgi?id=234609
char[] rankComponent = ('{' + String.valueOf(this.rank) + '}').toCharArray();
switch (this.boundKind) {
case Wildcard.UNBOUND :
wildCardKey = TypeConstants.WILDCARD_STAR;
break;
case Wildcard.EXTENDS :
wildCardKey = CharOperation.concat(TypeConstants.WILDCARD_PLUS, this.bound.computeUniqueKey(false/*not a leaf*/));
break;
default: // SUPER
wildCardKey = CharOperation.concat(TypeConstants.WILDCARD_MINUS, this.bound.computeUniqueKey(false/*not a leaf*/));
break;
}
return CharOperation.concat(genericTypeKey, rankComponent, wildCardKey);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#constantPoolName()
*/
@Override
public char[] constantPoolName() {
return erasure().constantPoolName();
}
@Override
public TypeBinding clone(TypeBinding immaterial) {
return new WildcardBinding(this.genericType, this.rank, this.bound, this.otherBounds, this.boundKind, this.environment);
}
@Override
public String annotatedDebugName() {
StringBuilder buffer = new StringBuilder(16);
AnnotationBinding [] annotations = getTypeAnnotations();
for (int i = 0, length = annotations == null ? 0 : annotations.length; i < length; i++) {
buffer.append(annotations[i]);
buffer.append(' ');
}
switch (this.boundKind) {
case Wildcard.UNBOUND :
return buffer.append(TypeConstants.WILDCARD_NAME).toString();
case Wildcard.EXTENDS :
if (this.otherBounds == null)
return buffer.append(CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_EXTENDS, this.bound.annotatedDebugName().toCharArray())).toString();
buffer.append(this.bound.annotatedDebugName());
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
buffer.append(" & ").append(this.otherBounds[i].annotatedDebugName()); //$NON-NLS-1$
}
return buffer.toString();
default: // SUPER
return buffer.append(CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_SUPER, this.bound.annotatedDebugName().toCharArray())).toString();
}
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#debugName()
*/
@Override
public String debugName() {
return toString();
}
@Override
public TypeBinding erasure() {
if (this.otherBounds == null) {
if (this.boundKind == Wildcard.EXTENDS)
return this.bound.erasure();
TypeVariableBinding var = typeVariable();
if (var != null)
return var.erasure();
return this.genericType; // if typeVariable() == null, then its inconsistent & return this.genericType to avoid NPE case
}
// intersection type
return this.bound.id == TypeIds.T_JavaLangObject
? this.otherBounds[0].erasure() // use first explicit bound to improve stackmap
: this.bound.erasure();
}
@Override
public char[] genericTypeSignature() {
if (this.genericSignature == null) {
switch (this.boundKind) {
case Wildcard.UNBOUND :
this.genericSignature = TypeConstants.WILDCARD_STAR;
break;
case Wildcard.EXTENDS :
this.genericSignature = CharOperation.concat(TypeConstants.WILDCARD_PLUS, this.bound.genericTypeSignature());
break;
default: // SUPER
this.genericSignature = CharOperation.concat(TypeConstants.WILDCARD_MINUS, this.bound.genericTypeSignature());
}
}
return this.genericSignature;
}
@Override
public int hashCode() {
return this.genericType.hashCode();
}
@Override
public boolean hasTypeBit(int bit) {
if (this.typeBits == TypeIds.BitUninitialized) {
// initialize from upper bounds
this.typeBits = 0;
if (this.superclass != null && this.superclass.hasTypeBit(~TypeIds.BitUninitialized))
this.typeBits |= (this.superclass.typeBits & TypeIds.InheritableBits);
if (this.superInterfaces != null)
for (int i = 0, l = this.superInterfaces.length; i < l; i++)
if (this.superInterfaces[i].hasTypeBit(~TypeIds.BitUninitialized))
this.typeBits |= (this.superInterfaces[i].typeBits & TypeIds.InheritableBits);
}
return (this.typeBits & bit) != 0;
}
void initialize(ReferenceBinding someGenericType, TypeBinding someBound, TypeBinding[] someOtherBounds) {
this.genericType = someGenericType;
this.bound = someBound;
this.otherBounds = someOtherBounds;
if (someGenericType != null) {
this.fPackage = someGenericType.getPackage();
}
if (someBound != null) {
this.tagBits |= someBound.tagBits & (TagBits.HasTypeVariable | TagBits.HasMissingType | TagBits.ContainsNestedTypeReferences |
TagBits.HasNullTypeAnnotation | TagBits.HasCapturedWildcard);
}
if (someOtherBounds != null) {
for (int i = 0, max = someOtherBounds.length; i < max; i++) {
TypeBinding someOtherBound = someOtherBounds[i];
this.tagBits |= someOtherBound.tagBits & (TagBits.ContainsNestedTypeReferences | TagBits.HasNullTypeAnnotation | TagBits.HasCapturedWildcard);
}
}
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding#isSuperclassOf(org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding)
*/
@Override
public boolean isSuperclassOf(ReferenceBinding otherType) {
if (this.boundKind == Wildcard.SUPER) {
if (this.bound instanceof ReferenceBinding) {
return ((ReferenceBinding) this.bound).isSuperclassOf(otherType);
} else { // array bound
return otherType.id == TypeIds.T_JavaLangObject;
}
}
return false;
}
@Override
public boolean isIntersectionType() {
return this.otherBounds != null;
}
@Override
public ReferenceBinding[] getIntersectingTypes() {
if (isIntersectionType()) {
ReferenceBinding[] allBounds = new ReferenceBinding[this.otherBounds.length+1];
try {
allBounds[0] = (ReferenceBinding) this.bound;
System.arraycopy(this.otherBounds, 0, allBounds, 1, this.otherBounds.length);
} catch (ClassCastException | ArrayStoreException ase) {
return null;
}
return allBounds;
}
return null;
}
@Override
public boolean isHierarchyConnected() {
return this.superclass != null && this.superInterfaces != null;
}
// to prevent infinite recursion when inspecting recursive generics:
boolean inRecursiveFunction = false;
@Override
public boolean enterRecursiveFunction() {
if (this.inRecursiveFunction)
return false;
this.inRecursiveFunction = true;
return true;
}
@Override
public void exitRecursiveFunction() {
this.inRecursiveFunction = false;
}
@Override
public boolean isProperType(boolean admitCapture18) {
if (this.inRecursiveFunction)
return true;
this.inRecursiveFunction = true;
try {
if (this.bound != null && !this.bound.isProperType(admitCapture18))
return false;
if (this.superclass != null && !this.superclass.isProperType(admitCapture18))
return false;
if (this.superInterfaces != null)
for (int i = 0, l = this.superInterfaces.length; i < l; i++)
if (!this.superInterfaces[i].isProperType(admitCapture18))
return false;
return true;
} finally {
this.inRecursiveFunction = false;
}
}
@Override
TypeBinding substituteInferenceVariable(InferenceVariable var, TypeBinding substituteType) {
boolean haveSubstitution = false;
TypeBinding currentBound = this.bound;
if (currentBound != null) {
currentBound = currentBound.substituteInferenceVariable(var, substituteType);
haveSubstitution |= TypeBinding.notEquals(currentBound, this.bound);
}
TypeBinding[] currentOtherBounds = null;
if (this.otherBounds != null) {
int length = this.otherBounds.length;
if (haveSubstitution)
System.arraycopy(this.otherBounds, 0, currentOtherBounds=new ReferenceBinding[length], 0, length);
for (int i = 0; i < length; i++) {
TypeBinding currentOtherBound = this.otherBounds[i];
if (currentOtherBound != null) {
currentOtherBound = currentOtherBound.substituteInferenceVariable(var, substituteType);
if (TypeBinding.notEquals(currentOtherBound, this.otherBounds[i])) {
if (currentOtherBounds == null)
System.arraycopy(this.otherBounds, 0, currentOtherBounds=new ReferenceBinding[length], 0, length);
currentOtherBounds[i] = currentOtherBound;
}
}
}
}
haveSubstitution |= currentOtherBounds != null;
if (haveSubstitution) {
WildcardBinding wildcard = this.environment.createWildcard(this.genericType, this.rank, currentBound, currentOtherBounds, this.boundKind);
return propagateNonConflictingNullAnnotations(wildcard);
}
return this;
}
@Override
public boolean isUnboundWildcard() {
return this.boundKind == Wildcard.UNBOUND;
}
@Override
public boolean isWildcard() {
return true;
}
@Override
int rank() {
return this.rank;
}
@Override
public char[] readableName() {
switch (this.boundKind) {
case Wildcard.UNBOUND :
return TypeConstants.WILDCARD_NAME;
case Wildcard.EXTENDS :
if (this.otherBounds == null)
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_EXTENDS, this.bound.readableName());
StringBuilder buffer = new StringBuilder(10);
buffer.append(this.bound.readableName());
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
buffer.append('&').append(this.otherBounds[i].readableName());
}
int length;
char[] result = new char[length = buffer.length()];
buffer.getChars(0, length, result, 0);
return result;
default: // SUPER
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_SUPER, this.bound.readableName());
}
}
@Override
public char[] nullAnnotatedReadableName(CompilerOptions options, boolean shortNames) {
StringBuilder buffer = new StringBuilder(10);
appendNullAnnotation(buffer, options);
switch (this.boundKind) {
case Wildcard.UNBOUND :
buffer.append(TypeConstants.WILDCARD_NAME);
break;
case Wildcard.EXTENDS :
if (this.otherBounds == null) {
buffer.append(TypeConstants.WILDCARD_NAME).append(TypeConstants.WILDCARD_EXTENDS);
buffer.append(this.bound.nullAnnotatedReadableName(options, shortNames));
} else {
buffer.append(this.bound.nullAnnotatedReadableName(options, shortNames));
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
buffer.append('&').append(this.otherBounds[i].nullAnnotatedReadableName(options, shortNames));
}
}
break;
default: // SUPER
buffer.append(TypeConstants.WILDCARD_NAME).append(TypeConstants.WILDCARD_SUPER).append(this.bound.nullAnnotatedReadableName(options, shortNames));
}
int length;
char[] result = new char[length = buffer.length()];
buffer.getChars(0, length, result, 0);
return result;
}
ReferenceBinding resolve() {
if ((this.tagBits & TagBits.HasUnresolvedTypeVariables) == 0)
return this;
this.tagBits &= ~TagBits.HasUnresolvedTypeVariables;
BinaryTypeBinding.resolveType(this.genericType, this.environment, false /* no raw conversion */);
switch(this.boundKind) {
case Wildcard.EXTENDS :
TypeBinding resolveType = BinaryTypeBinding.resolveType(this.bound, this.environment, true /* raw conversion */);
this.bound = resolveType;
this.tagBits |= resolveType.tagBits & TagBits.ContainsNestedTypeReferences | TagBits.HasCapturedWildcard;
for (int i = 0, length = this.otherBounds == null ? 0 : this.otherBounds.length; i < length; i++) {
resolveType = BinaryTypeBinding.resolveType(this.otherBounds[i], this.environment, true /* raw conversion */);
this.otherBounds[i]= resolveType;
this.tagBits |= resolveType.tagBits & TagBits.ContainsNestedTypeReferences | TagBits.HasCapturedWildcard;
}
break;
case Wildcard.SUPER :
resolveType = BinaryTypeBinding.resolveType(this.bound, this.environment, true /* raw conversion */);
this.bound = resolveType;
this.tagBits |= resolveType.tagBits & TagBits.ContainsNestedTypeReferences | TagBits.HasCapturedWildcard;
break;
case Wildcard.UNBOUND :
}
if (this.environment.usesNullTypeAnnotations()) {
evaluateNullAnnotations(null, null);
}
return this;
}
@Override
public char[] shortReadableName() {
switch (this.boundKind) {
case Wildcard.UNBOUND :
return TypeConstants.WILDCARD_NAME;
case Wildcard.EXTENDS :
if (this.otherBounds == null)
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_EXTENDS, this.bound.shortReadableName());
StringBuilder buffer = new StringBuilder(10);
buffer.append(this.bound.shortReadableName());
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
buffer.append('&').append(this.otherBounds[i].shortReadableName());
}
int length;
char[] result = new char[length = buffer.length()];
buffer.getChars(0, length, result, 0);
return result;
default: // SUPER
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_SUPER, this.bound.shortReadableName());
}
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#signature()
*/
@Override
public char[] signature() {
// should not be called directly on a wildcard; signature should only be asked on
// original methods or type erasures (which cannot denote wildcards at first level)
if (this.signature == null) {
switch (this.boundKind) {
case Wildcard.EXTENDS :
return this.bound.signature();
default: // SUPER | UNBOUND
return typeVariable().signature();
}
}
return this.signature;
}
@Override
public char[] sourceName() {
switch (this.boundKind) {
case Wildcard.UNBOUND :
return TypeConstants.WILDCARD_NAME;
case Wildcard.EXTENDS :
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_EXTENDS, this.bound.sourceName());
default: // SUPER
return CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_SUPER, this.bound.sourceName());
}
}
@Override
public ReferenceBinding superclass() {
if (this.superclass == null) {
TypeBinding superType = null;
if (this.boundKind == Wildcard.EXTENDS && !this.bound.isInterface()) {
superType = this.bound;
} else {
TypeVariableBinding variable = typeVariable();
if (variable != null) superType = variable.firstBound;
}
this.superclass = superType instanceof ReferenceBinding && !superType.isInterface()
? (ReferenceBinding) superType
: this.environment.getResolvedJavaBaseType(TypeConstants.JAVA_LANG_OBJECT, null);
}
return this.superclass;
}
@Override
public ReferenceBinding[] superInterfaces() {
if (this.superInterfaces == null) {
if (typeVariable() != null) {
this.superInterfaces = this.typeVariable.superInterfaces();
} else {
this.superInterfaces = Binding.NO_SUPERINTERFACES;
}
if (this.boundKind == Wildcard.EXTENDS) {
if (this.bound.isInterface()) {
// augment super interfaces with the wildcard bound
int length = this.superInterfaces.length;
System.arraycopy(this.superInterfaces, 0, this.superInterfaces = new ReferenceBinding[length+1], 1, length);
this.superInterfaces[0] = (ReferenceBinding) this.bound; // make bound first
}
if (this.otherBounds != null) {
// augment super interfaces with the wildcard otherBounds (interfaces per construction)
int length = this.superInterfaces.length;
int otherLength = this.otherBounds.length;
System.arraycopy(this.superInterfaces, 0, this.superInterfaces = new ReferenceBinding[length+otherLength], 0, length);
for (int i = 0; i < otherLength; i++) {
this.superInterfaces[length+i] = (ReferenceBinding) this.otherBounds[i];
}
}
}
}
return this.superInterfaces;
}
@Override
public void swapUnresolved(UnresolvedReferenceBinding unresolvedType, ReferenceBinding resolvedType, LookupEnvironment env) {
boolean affected = false;
if (this.genericType == unresolvedType) { //$IDENTITY-COMPARISON$
this.genericType = resolvedType; // no raw conversion
affected = true;
}
if (this.bound == unresolvedType) { //$IDENTITY-COMPARISON$
this.bound = env.convertUnresolvedBinaryToRawType(resolvedType);
affected = true;
}
if (this.otherBounds != null) {
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
if (this.otherBounds[i] == unresolvedType) { //$IDENTITY-COMPARISON$
this.otherBounds[i] = env.convertUnresolvedBinaryToRawType(resolvedType);
affected = true;
}
}
}
if (affected)
initialize(this.genericType, this.bound, this.otherBounds);
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
if (this.hasTypeAnnotations())
return annotatedDebugName();
switch (this.boundKind) {
case Wildcard.UNBOUND :
return new String(TypeConstants.WILDCARD_NAME);
case Wildcard.EXTENDS :
if (this.otherBounds == null)
return new String(CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_EXTENDS, this.bound.debugName().toCharArray()));
StringBuilder buffer = new StringBuilder(this.bound.debugName());
for (int i = 0, length = this.otherBounds.length; i < length; i++) {
buffer.append('&').append(this.otherBounds[i].debugName());
}
return buffer.toString();
default: // SUPER
return new String(CharOperation.concat(TypeConstants.WILDCARD_NAME, TypeConstants.WILDCARD_SUPER, this.bound.debugName().toCharArray()));
}
}
/**
* Returns associated type variable, or null in case of inconsistency
*/
public TypeVariableBinding typeVariable() {
if (this.typeVariable == null) {
TypeVariableBinding[] typeVariables = this.genericType.typeVariables();
if (this.rank < typeVariables.length)
this.typeVariable = typeVariables[this.rank];
}
return this.typeVariable;
}
@Override
public TypeBinding unannotated() {
return this.hasTypeAnnotations() ? this.environment.getUnannotatedType(this) : this;
}
@Override
public TypeBinding withoutToplevelNullAnnotation() {
if (!hasNullTypeAnnotations())
return this;
AnnotationBinding[] newAnnotations = this.environment.filterNullTypeAnnotations(getTypeAnnotations());
return this.environment.createWildcard(this.genericType, this.rank, this.bound, this.otherBounds, this.boundKind, newAnnotations);
}
@Override
public TypeBinding uncapture(Scope scope) {
if ((this.tagBits & TagBits.HasCapturedWildcard) == 0)
return this;
TypeBinding freeBound = this.bound != null ? this.bound.uncapture(scope) : null;
int length = 0;
TypeBinding [] freeOtherBounds = this.otherBounds == null ? null : new TypeBinding[length = this.otherBounds.length];
for (int i = 0; i < length; i++) {
freeOtherBounds[i] = this.otherBounds[i] == null ? null : this.otherBounds[i].uncapture(scope);
}
return scope.environment().createWildcard(this.genericType, this.rank, freeBound, freeOtherBounds, this.boundKind, getTypeAnnotations());
}
@Override
void collectInferenceVariables(Set variables) {
if (this.bound != null)
this.bound.collectInferenceVariables(variables);
if (this.otherBounds != null)
for (int i = 0, length = this.otherBounds.length; i < length; i++)
this.otherBounds[i].collectInferenceVariables(variables);
}
@Override
public boolean mentionsAny(TypeBinding[] parameters, int idx) {
if (this.inRecursiveFunction)
return false;
this.inRecursiveFunction = true;
try {
if (super.mentionsAny(parameters, idx))
return true;
if (this.bound != null && this.bound.mentionsAny(parameters, -1))
return true;
if (this.otherBounds != null) {
for (int i = 0, length = this.otherBounds.length; i < length; i++)
if (this.otherBounds[i].mentionsAny(parameters, -1))
return true;
}
} finally {
this.inRecursiveFunction = false;
}
return false;
}
@Override
public boolean acceptsNonNullDefault() {
return false;
}
@Override
public long updateTagBits() {
if (!this.inRecursiveFunction) {
this.inRecursiveFunction = true;
try {
if (this.bound != null)
this.tagBits |= this.bound.updateTagBits();
if (this.otherBounds != null) {
for (int i = 0, length = this.otherBounds.length; i < length; i++)
this.tagBits |= this.otherBounds[i].updateTagBits();
}
} finally {
this.inRecursiveFunction = false;
}
}
return super.updateTagBits();
}
@Override
public boolean isNonDenotable() {
return true;
}
/** When substituting this wildcard with 'type', perhaps null tagbits on this wildcard should be propagated. */
TypeBinding propagateNonConflictingNullAnnotations(TypeBinding type) {
if (!this.environment.usesNullTypeAnnotations())
return type;
if (type instanceof InferenceVariable) {
// just accumulate any hints:
((InferenceVariable) type).nullHints |= (this.tagBits & TagBits.AnnotationNullMASK);
return type;
}
if ((type.tagBits & TagBits.AnnotationNullMASK) != 0)
return type; // already annotated
AnnotationBinding[] annots = this.environment.nullAnnotationsFromTagBits(this.tagBits & TagBits.AnnotationNullMASK);
if (annots == null)
return type;
return this.environment.createAnnotatedType(type, annots);
}
}
