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1 /* |
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2 * Copyright (c) 2015, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.java2d.marlin; |
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27 |
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28 import jdk.internal.misc.JavaLangAccess; |
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29 import jdk.internal.misc.SharedSecrets; |
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30 |
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31 public final class MarlinUtils { |
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32 // TODO: use sun.util.logging.PlatformLogger once in JDK9 |
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33 private static final java.util.logging.Logger log; |
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34 |
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35 static { |
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36 if (MarlinConst.useLogger) { |
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37 log = java.util.logging.Logger.getLogger("sun.java2d.marlin"); |
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38 } else { |
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39 log = null; |
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40 } |
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41 } |
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42 |
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43 private MarlinUtils() { |
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44 // no-op |
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45 } |
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46 |
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47 public static void logInfo(final String msg) { |
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48 if (MarlinConst.useLogger) { |
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49 log.info(msg); |
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50 } else if (MarlinConst.enableLogs) { |
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51 System.out.print("INFO: "); |
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52 System.out.println(msg); |
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53 } |
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54 } |
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55 |
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56 public static void logException(final String msg, final Throwable th) { |
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57 if (MarlinConst.useLogger) { |
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58 // log.warning(msg, th); |
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59 log.log(java.util.logging.Level.WARNING, msg, th); |
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60 } else if (MarlinConst.enableLogs) { |
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61 System.out.print("WARNING: "); |
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62 System.out.println(msg); |
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63 th.printStackTrace(System.err); |
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64 } |
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65 } |
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66 |
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67 // Returns the caller's class and method's name; best effort |
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68 // if cannot infer, return the logger's name. |
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69 static String getCallerInfo(String className) { |
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70 String sourceClassName = null; |
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71 String sourceMethodName = null; |
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72 |
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73 JavaLangAccess access = SharedSecrets.getJavaLangAccess(); |
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74 Throwable throwable = new Throwable(); |
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75 int depth = access.getStackTraceDepth(throwable); |
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76 |
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77 boolean lookingForClassName = true; |
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78 for (int ix = 0; ix < depth; ix++) { |
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79 // Calling getStackTraceElement directly prevents the VM |
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80 // from paying the cost of building the entire stack frame. |
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81 StackTraceElement frame = access.getStackTraceElement(throwable, ix); |
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82 String cname = frame.getClassName(); |
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83 if (lookingForClassName) { |
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84 // Skip all frames until we have found the first frame having the class name. |
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85 if (cname.equals(className)) { |
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86 lookingForClassName = false; |
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87 } |
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88 } else { |
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89 if (!cname.equals(className)) { |
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90 // We've found the relevant frame. |
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91 sourceClassName = cname; |
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92 sourceMethodName = frame.getMethodName(); |
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93 break; |
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94 } |
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95 } |
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96 } |
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97 |
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98 if (sourceClassName != null) { |
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99 return sourceClassName + " " + sourceMethodName; |
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100 } else { |
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101 return "unknown"; |
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102 } |
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103 } |
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104 } |