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/*
* Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package invokespecial;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class Checker extends shared.Checker {
public Checker(Class staticTargetClass, Class dynamicTargetClass) {
super(staticTargetClass, dynamicTargetClass);
}
public String check (Class callerClass) {
// If objectref is null, the invokespecial instruction throws a NullPointerException.
if (dynamicTargetClass == null) {
return "java.lang.NullPointerException";
}
// TODO: find a citation from spec for this case
Method resolvedMethod;
try {
// May throw VerifyError
resolvedMethod = getMethodInHierarchy(staticTargetClass);
} catch (Throwable e) {
return e.getClass().getName();
}
if (resolvedMethod == null) {
return "java.lang.NoSuchMethodError";
}
// If:
// - the resolved method is protected (4.7)
// - it is a member of a superclass of the current class
// - the method is not declared in the same run-time package (5.3) as the current class
// then:
// the class of objectref must be either the current class or a subclass of the
// current class.
if (Modifier.isProtected(resolvedMethod.getModifiers())) {
Method methodInSuperclass = getMethodInHierarchy(resolvedMethod.getDeclaringClass().getSuperclass());
if (methodInSuperclass != null) {
String resolvedMethodPkg = getClassPackageName(resolvedMethod.getDeclaringClass());
String methodInSuperclassPkg = getClassPackageName(methodInSuperclass.getDeclaringClass());
if (!resolvedMethodPkg.equals(methodInSuperclassPkg)) {
//TODO: clarify this
// if (callerClass == methodInSuperclass.getDeclaringClass()) {
// return "java.lang.IllegalAccessError";
// }
}
}
}
/*
* The resolved method is selected for invocation unless all of
* the following conditions are true:
* * TODO: The ACC_SUPER flag (see Table 4.1, "Class access and property
* modifiers") is set for the current class.
* * The class of the resolved method is a superclass of the
* current class - assumed by construction procedure
*
* * The resolved method is not an instance initialization method (3.9).
*/
if (!"<init>".equals(methodName)) {
/*
* Let C be the direct superclass of the current class:
* * If C contains a declaration for an instance method with the same
* name and descriptor as the resolved method, then this method will be
* invoked. The lookup procedure terminates.
* * Otherwise, if C has a superclass, this same lookup procedure is
* performed recursively using the direct superclass of C. The method to
* be invoked is the result of the recursive invocation of this lookup
* procedure.
* * Otherwise, an AbstractMethodError is raised.
* TODO: so far, sometimes NSME is thrown
*/
Class klass = dynamicTargetClass.getSuperclass();
while (klass != Object.class) {
Method method = getDeclaredMethod(klass);
if (method != null) {
/*
* If the resolved method is a class (static) method, the
* invokespecial instruction throws an IncompatibleClassChangeError.
*/
if (Modifier.isStatic(method.getModifiers())) {
return "java.lang.IncompatibleClassChangeError";
}
// Check access rights
if ( checkAccess(method, callerClass)
// && !(
// Modifier.isProtected(method.getModifiers())
// && (
// staticTargetClass.isAssignableFrom(callerClass)
// || getClassPackageName(staticTargetClass).equals(getClassPackageName(callerClass))
// )
//
// )
)
{
return String.format("%s.%s"
, method.getDeclaringClass().getSimpleName()
, methodName
);
} else {
// IAE is thrown when located method can't be accessed from the call site
return "java.lang.IllegalAccessError";
}
}
klass = klass.getSuperclass();
}
return "java.lang.AbstractMethodError";
} else {
// The resolved method is an instance initialization method (3.9).
}
// TODO: change
return "---";
}
}
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