Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/profile/ContextTree.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.profile; |
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24 |
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25 import com.sun.max.util.timer.*; |
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26 |
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27 /** |
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28 * This class represents a context in which profiling is performed. Typically, |
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29 * a profiling context is thread-specific, meaning that it collects metrics such as |
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30 * execution times on a per-thread basis. |
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31 */ |
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32 public class ContextTree { |
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33 |
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34 protected static class Node { |
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35 protected final long id; |
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36 protected Node sibling; |
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37 protected Node child; |
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38 protected Timer timer; |
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39 |
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40 public Node(long id) { |
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41 this.id = id; |
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42 } |
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43 |
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44 public Node findChild() { |
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45 Node pos = child; |
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46 while (pos != null) { |
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47 if (pos.id == this.id) { |
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48 return pos; |
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49 } |
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50 pos = pos.sibling; |
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51 } |
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52 return null; |
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53 } |
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54 |
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55 public Node addChild(long searchId, Clock clock) { |
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56 Node foundChild = findChild(); |
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57 if (foundChild == null) { |
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58 foundChild = new Node(searchId); |
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59 foundChild.timer = new SingleUseTimer(clock); |
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60 foundChild.sibling = this.child; |
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61 this.child = foundChild; |
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62 } |
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63 return foundChild; |
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64 } |
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65 } |
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66 |
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67 public static final int MAXIMUM_DEPTH = 1024; |
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68 |
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69 protected final Clock clock; |
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70 protected final Node[] stack; |
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71 protected int depth; |
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72 |
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73 public ContextTree(Clock clock) { |
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74 this.clock = clock; |
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75 this.stack = new Node[MAXIMUM_DEPTH]; |
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76 depth = 0; |
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77 stack[0] = new Node(Long.MAX_VALUE); |
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78 } |
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79 |
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80 public void enter(long id) { |
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81 final Node top = stack[depth]; |
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82 final Node child = top.addChild(id, clock); |
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83 // push a new profiling node onto the stack |
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84 stack[++depth] = child; |
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85 child.timer.start(); |
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86 } |
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87 |
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88 public void exit(long id) { |
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89 while (depth > 0) { |
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90 // pop all profiling nodes until we find the correct ID. |
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91 final Node top = stack[depth--]; |
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92 top.timer.stop(); |
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93 if (top.id == id) { |
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94 break; |
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95 } |
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96 } |
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97 } |
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98 } |