| /* |
| * Copyright (c) 1997, 2021, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 java.lang.reflect; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.invoke.MethodHandle; |
| import java.lang.ref.WeakReference; |
| import java.security.AccessController; |
| |
| import jdk.internal.access.SharedSecrets; |
| import jdk.internal.misc.VM; |
| import jdk.internal.reflect.CallerSensitive; |
| import jdk.internal.reflect.Reflection; |
| import jdk.internal.reflect.ReflectionFactory; |
| import sun.security.action.GetPropertyAction; |
| import sun.security.util.SecurityConstants; |
| |
| /** |
| * The {@code AccessibleObject} class is the base class for {@code Field}, |
| * {@code Method}, and {@code Constructor} objects (known as <em>reflected |
| * objects</em>). It provides the ability to flag a reflected object as |
| * suppressing checks for Java language access control when it is used. This |
| * permits sophisticated applications with sufficient privilege, such as Java |
| * Object Serialization or other persistence mechanisms, to manipulate objects |
| * in a manner that would normally be prohibited. |
| * |
| * <p> Java language access control prevents use of private members outside |
| * their top-level class; package access members outside their package; protected members |
| * outside their package or subclasses; and public members outside their |
| * module unless they are declared in an {@link Module#isExported(String,Module) |
| * exported} package and the user {@link Module#canRead reads} their module. By |
| * default, Java language access control is enforced (with one variation) when |
| * {@code Field}s, {@code Method}s, or {@code Constructor}s are used to get or |
| * set fields, to invoke methods, or to create and initialize new instances of |
| * classes, respectively. Every reflected object checks that the code using it |
| * is in an appropriate class, package, or module. The check when invoked by |
| * <a href="{@docRoot}/../specs/jni/index.html">JNI code</a> with no Java |
| * class on the stack only succeeds if the member and the declaring class are |
| * public, and the class is in a package that is exported to all modules. </p> |
| * |
| * <p> The one variation from Java language access control is that the checks |
| * by reflected objects assume readability. That is, the module containing |
| * the use of a reflected object is assumed to read the module in which |
| * the underlying field, method, or constructor is declared. </p> |
| * |
| * <p> Whether the checks for Java language access control can be suppressed |
| * (and thus, whether access can be enabled) depends on whether the reflected |
| * object corresponds to a member in an exported or open package |
| * (see {@link #setAccessible(boolean)}). </p> |
| * |
| * @jls 6.6 Access Control |
| * @since 1.2 |
| * @revised 9 |
| */ |
| public class AccessibleObject implements AnnotatedElement { |
| static { |
| // AccessibleObject is initialized early in initPhase1 |
| SharedSecrets.setJavaLangReflectAccess(new ReflectAccess()); |
| } |
| |
| static void checkPermission() { |
| @SuppressWarnings("removal") |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| // SecurityConstants.ACCESS_PERMISSION is used to check |
| // whether a client has sufficient privilege to defeat Java |
| // language access control checks. |
| sm.checkPermission(SecurityConstants.ACCESS_PERMISSION); |
| } |
| } |
| |
| /** |
| * Convenience method to set the {@code accessible} flag for an |
| * array of reflected objects with a single security check (for efficiency). |
| * |
| * <p> This method may be used to enable access to all reflected objects in |
| * the array when access to each reflected object can be enabled as |
| * specified by {@link #setAccessible(boolean) setAccessible(boolean)}. </p> |
| * |
| * <p>If there is a security manager, its |
| * {@code checkPermission} method is first called with a |
| * {@code ReflectPermission("suppressAccessChecks")} permission. |
| * |
| * <p>A {@code SecurityException} is also thrown if any of the elements of |
| * the input {@code array} is a {@link java.lang.reflect.Constructor} |
| * object for the class {@code java.lang.Class} and {@code flag} is true. |
| * |
| * @param array the array of AccessibleObjects |
| * @param flag the new value for the {@code accessible} flag |
| * in each object |
| * @throws InaccessibleObjectException if access cannot be enabled for all |
| * objects in the array |
| * @throws SecurityException if the request is denied by the security manager |
| * or an element in the array is a constructor for {@code |
| * java.lang.Class} |
| * @see SecurityManager#checkPermission |
| * @see ReflectPermission |
| * @revised 9 |
| */ |
| @CallerSensitive |
| public static void setAccessible(AccessibleObject[] array, boolean flag) { |
| checkPermission(); |
| if (flag) { |
| Class<?> caller = Reflection.getCallerClass(); |
| array = array.clone(); |
| for (AccessibleObject ao : array) { |
| ao.checkCanSetAccessible(caller); |
| } |
| } |
| for (AccessibleObject ao : array) { |
| ao.setAccessible0(flag); |
| } |
| } |
| |
| /** |
| * Set the {@code accessible} flag for this reflected object to |
| * the indicated boolean value. A value of {@code true} indicates that |
| * the reflected object should suppress checks for Java language access |
| * control when it is used. A value of {@code false} indicates that |
| * the reflected object should enforce checks for Java language access |
| * control when it is used, with the variation noted in the class description. |
| * |
| * <p> This method may be used by a caller in class {@code C} to enable |
| * access to a {@link Member member} of {@link Member#getDeclaringClass() |
| * declaring class} {@code D} if any of the following hold: </p> |
| * |
| * <ul> |
| * <li> {@code C} and {@code D} are in the same module. </li> |
| * |
| * <li> The member is {@code public} and {@code D} is {@code public} in |
| * a package that the module containing {@code D} {@link |
| * Module#isExported(String,Module) exports} to at least the module |
| * containing {@code C}. </li> |
| * |
| * <li> The member is {@code protected} {@code static}, {@code D} is |
| * {@code public} in a package that the module containing {@code D} |
| * exports to at least the module containing {@code C}, and {@code C} |
| * is a subclass of {@code D}. </li> |
| * |
| * <li> {@code D} is in a package that the module containing {@code D} |
| * {@link Module#isOpen(String,Module) opens} to at least the module |
| * containing {@code C}. |
| * All packages in unnamed and open modules are open to all modules and |
| * so this method always succeeds when {@code D} is in an unnamed or |
| * open module. </li> |
| * </ul> |
| * |
| * <p> This method cannot be used to enable access to private members, |
| * members with default (package) access, protected instance members, or |
| * protected constructors when the declaring class is in a different module |
| * to the caller and the package containing the declaring class is not open |
| * to the caller's module. </p> |
| * |
| * <p> This method cannot be used to enable {@linkplain Field#set <em>write</em>} |
| * access to a <em>non-modifiable</em> final field. The following fields |
| * are non-modifiable: |
| * <ul> |
| * <li>static final fields declared in any class or interface</li> |
| * <li>final fields declared in a {@linkplain Class#isHidden() hidden class}</li> |
| * <li>final fields declared in a {@linkplain Class#isRecord() record}</li> |
| * </ul> |
| * <p> The {@code accessible} flag when {@code true} suppresses Java language access |
| * control checks to only enable {@linkplain Field#get <em>read</em>} access to |
| * these non-modifiable final fields. |
| * |
| * <p> If there is a security manager, its |
| * {@code checkPermission} method is first called with a |
| * {@code ReflectPermission("suppressAccessChecks")} permission. |
| * |
| * @param flag the new value for the {@code accessible} flag |
| * @throws InaccessibleObjectException if access cannot be enabled |
| * @throws SecurityException if the request is denied by the security manager |
| * @see #trySetAccessible |
| * @see java.lang.invoke.MethodHandles#privateLookupIn |
| * @revised 9 |
| */ |
| @CallerSensitive // overrides in Method/Field/Constructor are @CS |
| public void setAccessible(boolean flag) { |
| AccessibleObject.checkPermission(); |
| setAccessible0(flag); |
| } |
| |
| /** |
| * Sets the accessible flag and returns the new value |
| */ |
| boolean setAccessible0(boolean flag) { |
| this.override = flag; |
| return flag; |
| } |
| |
| /** |
| * Set the {@code accessible} flag for this reflected object to {@code true} |
| * if possible. This method sets the {@code accessible} flag, as if by |
| * invoking {@link #setAccessible(boolean) setAccessible(true)}, and returns |
| * the possibly-updated value for the {@code accessible} flag. If access |
| * cannot be enabled, i.e. the checks or Java language access control cannot |
| * be suppressed, this method returns {@code false} (as opposed to {@code |
| * setAccessible(true)} throwing {@code InaccessibleObjectException} when |
| * it fails). |
| * |
| * <p> This method is a no-op if the {@code accessible} flag for |
| * this reflected object is {@code true}. |
| * |
| * <p> For example, a caller can invoke {@code trySetAccessible} |
| * on a {@code Method} object for a private instance method |
| * {@code p.T::privateMethod} to suppress the checks for Java language access |
| * control when the {@code Method} is invoked. |
| * If {@code p.T} class is in a different module to the caller and |
| * package {@code p} is open to at least the caller's module, |
| * the code below successfully sets the {@code accessible} flag |
| * to {@code true}. |
| * |
| * <pre> |
| * {@code |
| * p.T obj = ....; // instance of p.T |
| * : |
| * Method m = p.T.class.getDeclaredMethod("privateMethod"); |
| * if (m.trySetAccessible()) { |
| * m.invoke(obj); |
| * } else { |
| * // package p is not opened to the caller to access private member of T |
| * ... |
| * } |
| * }</pre> |
| * |
| * <p> If there is a security manager, its {@code checkPermission} method |
| * is first called with a {@code ReflectPermission("suppressAccessChecks")} |
| * permission. </p> |
| * |
| * @return {@code true} if the {@code accessible} flag is set to {@code true}; |
| * {@code false} if access cannot be enabled. |
| * @throws SecurityException if the request is denied by the security manager |
| * |
| * @since 9 |
| * @see java.lang.invoke.MethodHandles#privateLookupIn |
| */ |
| @CallerSensitive |
| public final boolean trySetAccessible() { |
| AccessibleObject.checkPermission(); |
| |
| if (override == true) return true; |
| |
| // if it's not a Constructor, Method, Field then no access check |
| if (!Member.class.isInstance(this)) { |
| return setAccessible0(true); |
| } |
| |
| // does not allow to suppress access check for Class's constructor |
| Class<?> declaringClass = ((Member) this).getDeclaringClass(); |
| if (declaringClass == Class.class && this instanceof Constructor) { |
| return false; |
| } |
| |
| if (checkCanSetAccessible(Reflection.getCallerClass(), |
| declaringClass, |
| false)) { |
| return setAccessible0(true); |
| } else { |
| return false; |
| } |
| } |
| |
| |
| /** |
| * If the given AccessibleObject is a {@code Constructor}, {@code Method} |
| * or {@code Field} then checks that its declaring class is in a package |
| * that can be accessed by the given caller of setAccessible. |
| */ |
| void checkCanSetAccessible(Class<?> caller) { |
| // do nothing, needs to be overridden by Constructor, Method, Field |
| } |
| |
| final void checkCanSetAccessible(Class<?> caller, Class<?> declaringClass) { |
| checkCanSetAccessible(caller, declaringClass, true); |
| } |
| |
| private boolean checkCanSetAccessible(Class<?> caller, |
| Class<?> declaringClass, |
| boolean throwExceptionIfDenied) { |
| if (caller == MethodHandle.class) { |
| throw new IllegalCallerException(); // should not happen |
| } |
| |
| Module callerModule = caller.getModule(); |
| Module declaringModule = declaringClass.getModule(); |
| |
| if (callerModule == declaringModule) return true; |
| if (callerModule == Object.class.getModule()) return true; |
| if (!declaringModule.isNamed()) return true; |
| |
| String pn = declaringClass.getPackageName(); |
| int modifiers; |
| if (this instanceof Executable) { |
| modifiers = ((Executable) this).getModifiers(); |
| } else { |
| modifiers = ((Field) this).getModifiers(); |
| } |
| |
| // class is public and package is exported to caller |
| boolean isClassPublic = Modifier.isPublic(declaringClass.getModifiers()); |
| if (isClassPublic && declaringModule.isExported(pn, callerModule)) { |
| // member is public |
| if (Modifier.isPublic(modifiers)) { |
| return true; |
| } |
| |
| // member is protected-static |
| if (Modifier.isProtected(modifiers) |
| && Modifier.isStatic(modifiers) |
| && isSubclassOf(caller, declaringClass)) { |
| return true; |
| } |
| } |
| |
| // package is open to caller |
| if (declaringModule.isOpen(pn, callerModule)) { |
| return true; |
| } |
| |
| if (throwExceptionIfDenied) { |
| // not accessible |
| String msg = "Unable to make "; |
| if (this instanceof Field) |
| msg += "field "; |
| msg += this + " accessible: " + declaringModule + " does not \""; |
| if (isClassPublic && Modifier.isPublic(modifiers)) |
| msg += "exports"; |
| else |
| msg += "opens"; |
| msg += " " + pn + "\" to " + callerModule; |
| InaccessibleObjectException e = new InaccessibleObjectException(msg); |
| if (printStackTraceWhenAccessFails()) { |
| e.printStackTrace(System.err); |
| } |
| throw e; |
| } |
| return false; |
| } |
| |
| private boolean isSubclassOf(Class<?> queryClass, Class<?> ofClass) { |
| while (queryClass != null) { |
| if (queryClass == ofClass) { |
| return true; |
| } |
| queryClass = queryClass.getSuperclass(); |
| } |
| return false; |
| } |
| |
| /** |
| * Returns a short descriptive string to describe this object in log messages. |
| */ |
| String toShortString() { |
| return toString(); |
| } |
| |
| /** |
| * Get the value of the {@code accessible} flag for this reflected object. |
| * |
| * @return the value of the object's {@code accessible} flag |
| * |
| * @deprecated |
| * This method is deprecated because its name hints that it checks |
| * if the reflected object is accessible when it actually indicates |
| * if the checks for Java language access control are suppressed. |
| * This method may return {@code false} on a reflected object that is |
| * accessible to the caller. To test if this reflected object is accessible, |
| * it should use {@link #canAccess(Object)}. |
| * |
| * @revised 9 |
| */ |
| @Deprecated(since="9") |
| public boolean isAccessible() { |
| return override; |
| } |
| |
| /** |
| * Test if the caller can access this reflected object. If this reflected |
| * object corresponds to an instance method or field then this method tests |
| * if the caller can access the given {@code obj} with the reflected object. |
| * For instance methods or fields then the {@code obj} argument must be an |
| * instance of the {@link Member#getDeclaringClass() declaring class}. For |
| * static members and constructors then {@code obj} must be {@code null}. |
| * |
| * <p> This method returns {@code true} if the {@code accessible} flag |
| * is set to {@code true}, i.e. the checks for Java language access control |
| * are suppressed, or if the caller can access the member as |
| * specified in <cite>The Java Language Specification</cite>, |
| * with the variation noted in the class description. </p> |
| * |
| * @param obj an instance object of the declaring class of this reflected |
| * object if it is an instance method or field |
| * |
| * @return {@code true} if the caller can access this reflected object. |
| * |
| * @throws IllegalArgumentException |
| * <ul> |
| * <li> if this reflected object is a static member or constructor and |
| * the given {@code obj} is non-{@code null}, or </li> |
| * <li> if this reflected object is an instance method or field |
| * and the given {@code obj} is {@code null} or of type |
| * that is not a subclass of the {@link Member#getDeclaringClass() |
| * declaring class} of the member.</li> |
| * </ul> |
| * |
| * @since 9 |
| * @jls 6.6 Access Control |
| * @see #trySetAccessible |
| * @see #setAccessible(boolean) |
| */ |
| @CallerSensitive |
| public final boolean canAccess(Object obj) { |
| if (!Member.class.isInstance(this)) { |
| return override; |
| } |
| |
| Class<?> declaringClass = ((Member) this).getDeclaringClass(); |
| int modifiers = ((Member) this).getModifiers(); |
| if (!Modifier.isStatic(modifiers) && |
| (this instanceof Method || this instanceof Field)) { |
| if (obj == null) { |
| throw new IllegalArgumentException("null object for " + this); |
| } |
| // if this object is an instance member, the given object |
| // must be a subclass of the declaring class of this reflected object |
| if (!declaringClass.isAssignableFrom(obj.getClass())) { |
| throw new IllegalArgumentException("object is not an instance of " |
| + declaringClass.getName()); |
| } |
| } else if (obj != null) { |
| throw new IllegalArgumentException("non-null object for " + this); |
| } |
| |
| // access check is suppressed |
| if (override) return true; |
| |
| Class<?> caller = Reflection.getCallerClass(); |
| Class<?> targetClass; |
| if (this instanceof Constructor) { |
| targetClass = declaringClass; |
| } else { |
| targetClass = Modifier.isStatic(modifiers) ? null : obj.getClass(); |
| } |
| return verifyAccess(caller, declaringClass, targetClass, modifiers); |
| } |
| |
| /** |
| * Constructor: only used by the Java Virtual Machine. |
| */ |
| @Deprecated(since="17") |
| protected AccessibleObject() {} |
| |
| // Indicates whether language-level access checks are overridden |
| // by this object. Initializes to "false". This field is used by |
| // Field, Method, and Constructor. |
| // |
| // NOTE: for security purposes, this field must not be visible |
| // outside this package. |
| boolean override; |
| |
| // Reflection factory used by subclasses for creating field, |
| // method, and constructor accessors. Note that this is called |
| // very early in the bootstrapping process. |
| @SuppressWarnings("removal") |
| static final ReflectionFactory reflectionFactory = |
| AccessController.doPrivileged( |
| new ReflectionFactory.GetReflectionFactoryAction()); |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotation returned by this method is a |
| * declaration annotation. |
| * |
| * @implSpec |
| * The default implementation throws {@link |
| * UnsupportedOperationException}; subclasses should override this method. |
| * |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { |
| throw new UnsupportedOperationException("All subclasses should override this method"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @Override |
| public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { |
| return AnnotatedElement.super.isAnnotationPresent(annotationClass); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotations returned by this method are |
| * declaration annotations. |
| * |
| * @implSpec |
| * The default implementation throws {@link |
| * UnsupportedOperationException}; subclasses should override this method. |
| * |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) { |
| throw new UnsupportedOperationException("All subclasses should override this method"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotations returned by this method are |
| * declaration annotations. |
| * |
| * @since 1.5 |
| */ |
| @Override |
| public Annotation[] getAnnotations() { |
| return getDeclaredAnnotations(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotation returned by this method is a |
| * declaration annotation. |
| * |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public <T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass) { |
| // Only annotations on classes are inherited, for all other |
| // objects getDeclaredAnnotation is the same as |
| // getAnnotation. |
| return getAnnotation(annotationClass); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotations returned by this method are |
| * declaration annotations. |
| * |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.8 |
| */ |
| @Override |
| public <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass) { |
| // Only annotations on classes are inherited, for all other |
| // objects getDeclaredAnnotationsByType is the same as |
| // getAnnotationsByType. |
| return getAnnotationsByType(annotationClass); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <p> Note that any annotations returned by this method are |
| * declaration annotations. |
| * |
| * @implSpec |
| * The default implementation throws {@link |
| * UnsupportedOperationException}; subclasses should override this method. |
| * |
| * @since 1.5 |
| */ |
| @Override |
| public Annotation[] getDeclaredAnnotations() { |
| throw new UnsupportedOperationException("All subclasses should override this method"); |
| } |
| |
| // Shared access checking logic. |
| |
| // For non-public members or members in package-private classes, |
| // it is necessary to perform somewhat expensive access checks. |
| // If the access check succeeds for a given class, it will |
| // always succeed (it is not affected by the granting or revoking |
| // of permissions); we speed up the check in the common case by |
| // remembering the last Class for which the check succeeded. |
| // |
| // The simple access check for Constructor is to see if |
| // the caller has already been seen, verified, and cached. |
| // |
| // A more complicated access check cache is needed for Method and Field |
| // The cache can be either null (empty cache), {caller,targetClass} pair, |
| // or a caller (with targetClass implicitly equal to memberClass). |
| // In the {caller,targetClass} case, the targetClass is always different |
| // from the memberClass. |
| volatile Object accessCheckCache; |
| |
| private static class Cache { |
| final WeakReference<Class<?>> callerRef; |
| final WeakReference<Class<?>> targetRef; |
| |
| Cache(Class<?> caller, Class<?> target) { |
| this.callerRef = new WeakReference<>(caller); |
| this.targetRef = new WeakReference<>(target); |
| } |
| |
| boolean isCacheFor(Class<?> caller, Class<?> refc) { |
| return callerRef.refersTo(caller) && targetRef.refersTo(refc); |
| } |
| |
| static Object protectedMemberCallerCache(Class<?> caller, Class<?> refc) { |
| return new Cache(caller, refc); |
| } |
| } |
| |
| /* |
| * Returns true if the previous access check was verified for the |
| * given caller accessing a protected member with an instance of |
| * the given targetClass where the target class is different than |
| * the declaring member class. |
| */ |
| private boolean isAccessChecked(Class<?> caller, Class<?> targetClass) { |
| Object cache = accessCheckCache; // read volatile |
| if (cache instanceof Cache) { |
| return ((Cache) cache).isCacheFor(caller, targetClass); |
| } |
| return false; |
| } |
| |
| /* |
| * Returns true if the previous access check was verified for the |
| * given caller accessing a static member or an instance member of |
| * the target class that is the same as the declaring member class. |
| */ |
| private boolean isAccessChecked(Class<?> caller) { |
| Object cache = accessCheckCache; // read volatile |
| if (cache instanceof WeakReference) { |
| @SuppressWarnings("unchecked") |
| WeakReference<Class<?>> ref = (WeakReference<Class<?>>) cache; |
| return ref.refersTo(caller); |
| } |
| return false; |
| } |
| |
| final void checkAccess(Class<?> caller, Class<?> memberClass, |
| Class<?> targetClass, int modifiers) |
| throws IllegalAccessException |
| { |
| if (!verifyAccess(caller, memberClass, targetClass, modifiers)) { |
| IllegalAccessException e = Reflection.newIllegalAccessException( |
| caller, memberClass, targetClass, modifiers); |
| if (printStackTraceWhenAccessFails()) { |
| e.printStackTrace(System.err); |
| } |
| throw e; |
| } |
| } |
| |
| final boolean verifyAccess(Class<?> caller, Class<?> memberClass, |
| Class<?> targetClass, int modifiers) |
| { |
| if (caller == memberClass) { // quick check |
| return true; // ACCESS IS OK |
| } |
| if (targetClass != null // instance member or constructor |
| && Modifier.isProtected(modifiers) |
| && targetClass != memberClass) { |
| if (isAccessChecked(caller, targetClass)) { |
| return true; // ACCESS IS OK |
| } |
| } else if (isAccessChecked(caller)) { |
| // Non-protected case (or targetClass == memberClass or static member). |
| return true; // ACCESS IS OK |
| } |
| |
| // If no return, fall through to the slow path. |
| return slowVerifyAccess(caller, memberClass, targetClass, modifiers); |
| } |
| |
| // Keep all this slow stuff out of line: |
| private boolean slowVerifyAccess(Class<?> caller, Class<?> memberClass, |
| Class<?> targetClass, int modifiers) |
| { |
| |
| if (caller == null) { |
| // No caller frame when a native thread attaches to the VM |
| // only allow access to a public accessible member |
| return Reflection.verifyPublicMemberAccess(memberClass, modifiers); |
| } |
| |
| if (!Reflection.verifyMemberAccess(caller, memberClass, targetClass, modifiers)) { |
| // access denied |
| return false; |
| } |
| |
| // Success: Update the cache. |
| Object cache = (targetClass != null |
| && Modifier.isProtected(modifiers) |
| && targetClass != memberClass) |
| ? Cache.protectedMemberCallerCache(caller, targetClass) |
| : new WeakReference<>(caller); |
| accessCheckCache = cache; // write volatile |
| return true; |
| } |
| |
| // true to print a stack trace when access fails |
| private static volatile boolean printStackWhenAccessFails; |
| |
| // true if printStack* values are initialized |
| private static volatile boolean printStackPropertiesSet; |
| |
| /** |
| * Returns true if a stack trace should be printed when access fails. |
| */ |
| private static boolean printStackTraceWhenAccessFails() { |
| if (!printStackPropertiesSet && VM.initLevel() >= 1) { |
| String s = GetPropertyAction.privilegedGetProperty( |
| "sun.reflect.debugModuleAccessChecks"); |
| if (s != null) { |
| printStackWhenAccessFails = !s.equalsIgnoreCase("false"); |
| } |
| printStackPropertiesSet = true; |
| } |
| return printStackWhenAccessFails; |
| } |
| |
| /** |
| * Returns the root AccessibleObject; or null if this object is the root. |
| * |
| * All subclasses override this method. |
| */ |
| AccessibleObject getRoot() { |
| throw new InternalError(); |
| } |
| } |
