144 lines
5.4 KiB
Java
144 lines
5.4 KiB
Java
/*
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* Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package invokevirtual;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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public class Checker extends shared.Checker {
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public Checker(Class staticTargetClass, Class dynamicTargetClass) {
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super(staticTargetClass, dynamicTargetClass);
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}
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public String check (Class callerClass) {
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Method m;
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try {
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// May cause java.lang.VerifyError
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m = getOverriddenMethod();
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} catch (Throwable e) {
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return e.getClass().getName();
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}
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// Check method accessibility (it's a static property, according to JLS #6.6: Access Control)
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if (m != null) {
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Method staticTargetMethod = getDeclaredMethod(staticTargetClass);
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if (checkAccess(staticTargetMethod, callerClass)) {
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// Can't invoke abstract method
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if ( Modifier.isAbstract(m.getModifiers())) {
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return "java.lang.AbstractMethodError";
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}
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return String.format("%s.%s"
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, m.getDeclaringClass().getSimpleName()
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, methodName
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);
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} else {
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// if method isn't accessible, IllegalAccessError is thrown
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return "java.lang.IllegalAccessError";
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}
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} else {
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// if method == null, NoSuchMethodError is thrown
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return "java.lang.NoSuchMethodError";
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}
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}
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public Method getOverriddenMethod() {
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return getOverriddenMethod(staticTargetClass, dynamicTargetClass);
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}
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public Method getOverriddenMethod(Class staticTarget, Class dynamicTarget) {
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// Assertion #1. C is a subclass of A
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if (!staticTarget.isAssignableFrom(dynamicTarget)) {
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return null;
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}
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Method staticTargetMethod = getDeclaredMethod(staticTarget);
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Method dynamicTargetMethod = getDeclaredMethod(dynamicTarget);
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if (staticTarget.equals(dynamicTarget)) {
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return staticTargetMethod;
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}
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// TODO: ? need to find out the right behavior
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if (staticTargetMethod == null) {
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return null;
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}
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// Dynamic target doesn't have desired method, so check its superclass
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if (dynamicTargetMethod == null) {
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return getOverriddenMethod(staticTarget, dynamicTarget.getSuperclass());
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} else {
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// Private method can't override anything
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if (Modifier.isPrivate(dynamicTargetMethod.getModifiers())) {
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return getOverriddenMethod(staticTarget, dynamicTarget.getSuperclass());
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}
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}
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// TODO: abstract methods
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//Assertion #3.a: A.m2 is PUB || PROT || (PP && PKG(A) == PKG(C))
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int staticTargetModifiers = staticTargetMethod.getModifiers();
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{
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boolean isPublic = Modifier.isPublic(staticTargetModifiers);
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boolean isProtected = Modifier.isProtected(staticTargetModifiers);
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boolean isPrivate = Modifier.isPrivate(staticTargetModifiers) ;
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String staticTargetPkg = getClassPackageName(staticTarget);
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String dynamicTargetPkg = getClassPackageName(dynamicTarget);
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if (isPublic || isProtected
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|| (!isPublic && !isProtected && !isPrivate
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&& staticTargetPkg.equals(dynamicTargetPkg))) {
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return dynamicTargetMethod;
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}
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}
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// OR
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//Assertion #3.b: exists m3: C.m1 != B.m3, A.m2 != B.m3, B.m3 overrides A.m2, C.m1 overrides B.m3
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Class ancestor = dynamicTarget.getSuperclass();
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while (ancestor != staticTarget) {
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Method OverriddenM2 = getOverriddenMethod(staticTarget, ancestor);
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Method m3 = getDeclaredMethod(ancestor);
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Method m1 = getOverriddenMethod(ancestor, dynamicTarget);
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if (m1 != null && m3 != null) {
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if (m1.equals(dynamicTargetMethod) && m3.equals(OverriddenM2)) {
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return dynamicTargetMethod;
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}
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} else {
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if (m1 == null && dynamicTargetMethod == null
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&& m3 == null && OverriddenM2 == null)
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{
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return null;
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}
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}
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ancestor = ancestor.getSuperclass();
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}
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return getOverriddenMethod(staticTarget, dynamicTarget.getSuperclass());
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}
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}
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