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view graal/com.oracle.max.base/src/com/sun/max/profile/ContextTree.java @ 4186:71a2cd79c375
Made stdout for mx unbuffered.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 13:53:38 +0100 |
parents | bc8527f3071c |
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/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.profile; import com.sun.max.util.timer.*; /** * This class represents a context in which profiling is performed. Typically, * a profiling context is thread-specific, meaning that it collects metrics such as * execution times on a per-thread basis. */ public class ContextTree { protected static class Node { protected final long id; protected Node sibling; protected Node child; protected Timer timer; public Node(long id) { this.id = id; } public Node findChild() { Node pos = child; while (pos != null) { if (pos.id == this.id) { return pos; } pos = pos.sibling; } return null; } public Node addChild(long searchId, Clock clock) { Node foundChild = findChild(); if (foundChild == null) { foundChild = new Node(searchId); foundChild.timer = new SingleUseTimer(clock); foundChild.sibling = this.child; this.child = foundChild; } return foundChild; } } public static final int MAXIMUM_DEPTH = 1024; protected final Clock clock; protected final Node[] stack; protected int depth; public ContextTree(Clock clock) { this.clock = clock; this.stack = new Node[MAXIMUM_DEPTH]; depth = 0; stack[0] = new Node(Long.MAX_VALUE); } public void enter(long id) { final Node top = stack[depth]; final Node child = top.addChild(id, clock); // push a new profiling node onto the stack stack[++depth] = child; child.timer.start(); } public void exit(long id) { while (depth > 0) { // pop all profiling nodes until we find the correct ID. final Node top = stack[depth--]; top.timer.stop(); if (top.id == id) { break; } } } }