/* * Copyright (C) 2010 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.profiler; import dalvik.system.VMStack; import java.util.Arrays; class DalvikThreadSampler implements ThreadSampler { private int depth; /** * Reusable storage for sampling sized for the specified depth. */ private StackTraceElement[][] mutableStackTraceElements; @Override public void setDepth(int depth) { this.depth = depth; this.mutableStackTraceElements = new StackTraceElement[depth+1][]; for (int i = 1; i < mutableStackTraceElements.length; i++) { this.mutableStackTraceElements[i] = new StackTraceElement[i]; } } @Override public StackTraceElement[] getStackTrace(Thread thread) { int count = VMStack.fillStackTraceElements(thread, mutableStackTraceElements[depth]); if (count == 0) { return null; } if (count < depth) { System.arraycopy(mutableStackTraceElements[depth], 0, mutableStackTraceElements[count], 0, count); } return mutableStackTraceElements[count]; } }