| /* |
| * 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]; |
| } |
| } |