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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeFailure.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents 1348cc2e084e
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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 package com.oracle.truffle.api.instrument;
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26
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27 import com.oracle.truffle.api.nodes.Node;
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28 import com.oracle.truffle.api.nodes.NodeFieldAccessor;
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29 import com.oracle.truffle.api.nodes.NodeUtil;
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30
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31 /**
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32 * Description of a failed attempt to instrument an AST node.
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33 */
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34 public final class ProbeFailure {
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35
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36 public enum Reason {
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37
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38 /**
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39 * Node to be probed has no parent.
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40 */
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41 NO_PARENT("Node to be probed has no parent"),
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42
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43 /**
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44 * The node to be probed is a wrapper.
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45 */
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46 WRAPPER_NODE("The node to be probed is a wrapper"),
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47
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48 /**
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49 * The node to be probed does not support {@linkplain Instrumenter Instrumentation} .
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50 */
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51 NOT_INSTRUMENTABLE("The node to be project is \"not instrumentable\""),
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52
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53 /**
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54 * No wrapper could be created that is also a {@link Node}.
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55 */
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56 NO_WRAPPER("No wrapper could be created"),
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57
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58 /**
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59 * Wrapper not assignable to the parent's child field.
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60 */
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61 WRAPPER_TYPE("Wrapper not assignable to parent's child field");
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62
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63 final String message;
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64
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65 private Reason(String message) {
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66 this.message = message;
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67 }
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68
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69 public String getMessage() {
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70 return message;
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71 }
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72 }
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73
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74 private final Reason reason;
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75 private final Node parent;
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76 private final Node child;
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77 private final Object wrapper;
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78
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79 /**
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80 * Description of an internal failure of {@link Instrumenter#probe(Node)}.
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81 *
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82 * @param reason what caused the failure
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83 * @param parent the parent, if known, of the child being probed
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84 * @param child this child being probed
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85 * @param wrapper the {@link WrapperNode} created to implement the probe
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86 */
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87 public ProbeFailure(Reason reason, Node parent, Node child, Object wrapper) {
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88 this.reason = reason;
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89 this.parent = parent;
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90 this.child = child;
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91 this.wrapper = wrapper;
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92 }
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93
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94 /**
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95 * @return a short explanation of the failure
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96 */
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97 public Reason getReason() {
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98 return reason;
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99 }
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100
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101 /**
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102 * @return the parent, if any, of the node being probed
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103 */
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104 public Node getParent() {
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105 return parent;
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106 }
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107
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108 /**
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109 * @return the node being probed
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110 */
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111 public Node getChild() {
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112 return child;
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113 }
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114
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115 /**
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116 * @return the {@link WrapperNode} created for the probe attempt
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117 */
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118 public Object getWrapper() {
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119 return wrapper;
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120 }
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121
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122 public String getMessage() {
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123 final StringBuilder sb = new StringBuilder(reason.message + ": ");
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124 if (parent != null) {
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125 sb.append("parent=" + parent.getClass().getSimpleName() + " ");
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126 if (child != null) {
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127 sb.append("child=" + child.getClass().getSimpleName() + " ");
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128 final NodeFieldAccessor field = NodeUtil.findChildField(parent, child);
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129 if (field != null) {
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130 sb.append("field=" + field.getName() + " ");
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131 }
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132 }
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133 }
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134 if (wrapper != null) {
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135 sb.append("wrapper=" + wrapper.getClass().getSimpleName());
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136 }
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137 return sb.toString();
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138 }
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139
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140 }