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 import dalvik.annotation.optimization.FastNative; 20 21 /** 22 * Provides a limited interface to the Dalvik VM stack. This class is mostly 23 * used for implementing security checks. 24 * 25 * @hide 26 */ 27 public final class VMStack { 28 /** 29 * Returns the defining class loader of the caller's caller. 30 * 31 * @return the requested class loader, or {@code null} if this is the 32 * bootstrap class loader. 33 */ 34 @FastNative 35 native public static ClassLoader getCallingClassLoader(); 36 37 /** 38 * Returns the class of the caller's caller. 39 * 40 * @return the requested class, or {@code null}. 41 */ 42 public static Class<?> getStackClass1() { 43 return getStackClass2(); 44 } 45 46 /** 47 * Returns the class of the caller's caller's caller. 48 * 49 * @return the requested class, or {@code null}. 50 */ 51 @FastNative 52 native public static Class<?> getStackClass2(); 53 54 /** 55 * Returns the first ClassLoader on the call stack that isn't the 56 * bootstrap class loader. 57 */ 58 @FastNative 59 public native static ClassLoader getClosestUserClassLoader(); 60 61 /** 62 * Retrieves the stack trace from the specified thread. 63 * 64 * @param t 65 * thread of interest 66 * @return an array of stack trace elements, or null if the thread 67 * doesn't have a stack trace (e.g. because it exited) 68 */ 69 @FastNative 70 native public static StackTraceElement[] getThreadStackTrace(Thread t); 71 72 /** 73 * Retrieves a partial stack trace from the specified thread into 74 * the provided array. 75 * 76 * @param t 77 * thread of interest 78 * @param stackTraceElements 79 * preallocated array for use when only the top of stack is 80 * desired. Unused elements will be filled with null values. 81 * @return the number of elements filled 82 */ 83 @FastNative 84 native public static int fillStackTraceElements(Thread t, 85 StackTraceElement[] stackTraceElements); 86 } 87
