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/*
* 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);
}
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