| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package dalvik.system; |
| |
| /** |
| * Provides a limited interface to the Dalvik VM stack. This class is mostly |
| * used for implementing security checks. |
| * |
| * @hide |
| */ |
| public final class VMStack { |
| /** |
| * Returns the defining class loader of the caller's caller. |
| * |
| * @return the requested class loader, or {@code null} if this is the |
| * bootstrap class loader. |
| */ |
| native public static ClassLoader getCallingClassLoader(); |
| |
| /** |
| * Returns the class of the caller's caller's caller. |
| * |
| * @return the requested class, or {@code null}. |
| */ |
| native public static Class<?> getStackClass2(); |
| |
| /** |
| * Creates an array of classes from the methods at the top of the stack. |
| * We continue until we reach the bottom of the stack or exceed the |
| * specified maximum depth. |
| * <p> |
| * The topmost stack frame (this method) and the one above that (the |
| * caller) are excluded from the array. Frames with java.lang.reflect |
| * classes are skipped over. |
| * <p> |
| * The classes in the array are the defining classes of the methods. |
| * <p> |
| * This is similar to Harmony's VMStack.getClasses, except that this |
| * implementation doesn't have a concept of "privileged" frames. |
| * |
| * @param maxDepth |
| * maximum number of classes to return, or -1 for all |
| * @return an array with classes for the most-recent methods on the stack |
| */ |
| native public static Class<?>[] getClasses(int maxDepth); |
| |
| /** |
| * Returns the first ClassLoader on the call stack that isn't either of |
| * the passed-in ClassLoaders. |
| */ |
| public static ClassLoader getClosestUserClassLoader(ClassLoader bootstrap, |
| ClassLoader system) { |
| Class<?>[] stackClasses = VMStack.getClasses(-1); |
| for (Class<?> stackClass : stackClasses) { |
| ClassLoader loader = stackClass.getClassLoader(); |
| if (loader != null && loader != bootstrap && loader != system) { |
| return loader; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Retrieves the stack trace from the specified thread. |
| * |
| * @param t |
| * thread of interest |
| * @return an array of stack trace elements, or null if the thread |
| * doesn't have a stack trace (e.g. because it exited) |
| */ |
| native public static StackTraceElement[] getThreadStackTrace(Thread t); |
| |
| /** |
| * Retrieves a partial stack trace from the specified thread into |
| * the provided array. |
| * |
| * @param t |
| * thread of interest |
| * @param stackTraceElements |
| * preallocated array for use when only the top of stack is |
| * desired. Unused elements will be filled with null values. |
| * @return the number of elements filled |
| */ |
| native public static int fillStackTraceElements(Thread t, |
| StackTraceElement[] stackTraceElements); |
| } |