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 */ 32 native public static ClassLoader getCallingClassLoader(); 33 34 /** 35 * Returns the class of the caller's caller. 36 * 37 * @return the requested class, or {@code null}. 38 */ 39 public static Class<?> getStackClass1() { 40 return getStackClass2(); 41 } 42 43 /** 44 * Returns the class of the caller's caller's caller. 45 * 46 * @return the requested class, or {@code null}. 47 */ 48 native public static Class<?> getStackClass2(); 49 50 /** 51 * Returns the first ClassLoader on the call stack that isn't either of 52 * the passed-in ClassLoaders. 53 */ 54 public native static ClassLoader getClosestUserClassLoader(ClassLoader bootstrap, 55 ClassLoader system); 56 57 /** 58 * Retrieves the stack trace from the specified thread. 59 * 60 * @param t 61 * thread of interest 62 * @return an array of stack trace elements, or null if the thread 63 * doesn't have a stack trace (e.g. because it exited) 64 */ 65 native public static StackTraceElement[] getThreadStackTrace(Thread t); 66 67 /** 68 * Retrieves a partial stack trace from the specified thread into 69 * the provided array. 70 * 71 * @param t 72 * thread of interest 73 * @param stackTraceElements 74 * preallocated array for use when only the top of stack is 75 * desired. Unused elements will be filled with null values. 76 * @return the number of elements filled 77 */ 78 native public static int fillStackTraceElements(Thread t, 79 StackTraceElement[] stackTraceElements); 80 } 81
