1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dalvik.system; 18 19 /** 20 * Provides a limited interface to the Dalvik VM stack. This class is mostly 21 * used for implementing security checks. 22 * 23 * @hide 24 */ 25 public final class VMStack { 26 /** 27 * Returns the defining class loader of the caller's caller. 28 * 29 * @return the requested class loader, or {@code null} if this is the 30 * bootstrap class loader. 31 */ getCallingClassLoader()32 native public static ClassLoader getCallingClassLoader(); 33 34 /** 35 * Returns the defining class loader of the caller's caller's caller. 36 * 37 * @return the requested class loader, or {@code null} if this is the 38 * bootstrap class loader. 39 */ getCallingClassLoader2()40 native public static ClassLoader getCallingClassLoader2(); 41 42 /** 43 * Returns the class of the caller's caller's caller. 44 * 45 * @hide 46 * @return the requested class, or {@code null}. 47 */ getStackClass2()48 native public static Class<?> getStackClass2(); 49 50 /** 51 * Creates an array of classes from the methods at the top of the stack. 52 * We continue until we reach the bottom of the stack or exceed the 53 * specified maximum depth. If stopAtPrivileged is set, the last 54 * element of the array will be the caller of the most-recent privileged 55 * method. 56 * <p> 57 * The topmost stack frame (this method) and the one above that (the 58 * caller) are excluded from the array. Frames with java.lang.reflect 59 * classes are skipped over. 60 * <p> 61 * The classes in the array are the defining classes of the methods. 62 * <p> 63 * This is expected to be identical to Harmony's VMStack.getClasses. 64 * 65 * @param maxDepth 66 * maximum number of classes to return, or -1 for all 67 * @param stopAtPrivileged 68 * stop when a privileged frame is reached 69 * @return an array with classes for the most-recent methods on the stack 70 */ getClasses(int maxDepth, boolean stopAtPrivileged)71 native public static Class<?>[] getClasses(int maxDepth, 72 boolean stopAtPrivileged); 73 74 /** 75 * Retrieves the stack trace from the specified thread. 76 * 77 * @param t 78 * thread of interest 79 * @return an array of stack trace elements, or null if the thread 80 * doesn't have a stack trace (e.g. because it exited) 81 */ getThreadStackTrace(Thread t)82 native public static StackTraceElement[] getThreadStackTrace(Thread t); 83 } 84 85