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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/Breakpoint.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 c04f6f51b9bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
22003
5bc7f7b867ab Making debugger always on for each TruffleVM execution. Introducing EventConsumer to process such debugger events. Requesting each RootNode to be associated with a TruffleLanguage, so debugger can find out proper context for each Node where executions gets suspended.
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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.debug;
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26
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27 import java.io.IOException;
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28
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29 import javax.sound.midi.Instrument;
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30
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31 import com.oracle.truffle.api.instrument.Instrumenter;
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32 import com.oracle.truffle.api.instrument.Probe;
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33 import com.oracle.truffle.api.source.Source;
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34
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35 /**
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36 * Breakpoint in a {@link com.oracle.truffle.api.vm.PolyglotEngine} with
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37 * {@link com.oracle.truffle.api.debug debugging turned on}. You can ask
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38 * {@link Debugger#setLineBreakpoint(int, com.oracle.truffle.api.source.LineLocation, boolean)} or
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39 * {@link Debugger#setTagBreakpoint(int, com.oracle.truffle.api.instrument.SyntaxTag, boolean)} to
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40 * create an instance of {@link Breakpoint}.
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41 */
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42 @SuppressWarnings("javadoc")
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43 public abstract class Breakpoint {
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44
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45 /**
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46 * A general model of the states occupied by a {@link Breakpoint} during its lifetime.
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47 */
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48 public enum State {
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49
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50 /**
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51 * Not attached, enabled.
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52 * <p>
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53 * Created for a source location but not yet attached: perhaps just created and the source
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54 * hasn't been loaded yet; perhaps source has been loaded, but the line location isn't
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55 * probed so a breakpoint cannot be attached. Can be either enabled or disabled.
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56 */
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57 ENABLED_UNRESOLVED("Enabled/Unresolved"),
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58
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59 /**
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60 * Not attached, disabled.
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61 * <p>
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62 * Created for a source location but not yet attached: perhaps just created and the source
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63 * hasn't been loaded yet; perhaps source has been loaded, but the line location isn't
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64 * probed so a breakpoint cannot be attached.
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65 */
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66 DISABLED_UNRESOLVED("Disabled/Unresolved"),
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67
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68 /**
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69 * Attached, instrument enabled.
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70 * <p>
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71 * Is currently implemented by some {@link Instrument}, which is attached to a {@link Probe}
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72 * at a specific node in the AST, and the breakpoint is enabled.
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73 */
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74 ENABLED("Enabled"),
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75
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76 /**
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77 * Attached, instrument disabled.
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78 * <p>
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79 * Is currently implemented by some {@link Instrument}, which is attached to a {@link Probe}
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80 * at a specific node in the AST, and the breakpoint is disabled.
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81 */
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82 DISABLED("Disabled"),
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83
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84 /**
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85 * Not attached, instrument is permanently disabled.
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86 */
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87 DISPOSED("Disposed");
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88
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89 private final String name;
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90
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91 State(String name) {
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92 this.name = name;
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93 }
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94
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95 public String getName() {
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96 return name;
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97 }
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98
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99 @Override
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100 public String toString() {
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101 return name;
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102 }
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103
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104 }
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105
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106 private final boolean isOneShot;
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107
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108 private int ignoreCount;
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109
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110 private int hitCount;
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111
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112 private State state;
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113
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114 Breakpoint(State state, int ignoreCount, boolean isOneShot) {
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115 this.state = state;
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116 this.isOneShot = isOneShot;
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117 this.ignoreCount = ignoreCount;
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118 }
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119
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120 /**
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121 * Enables or disables this breakpoint's AST {@linkplain Instrumenter instrumentation}. The
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122 * breakpoint is enabled by default.
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123 *
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124 * @param enabled <code>true</code> to activate the instrumentation, <code>false</code> to
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125 * deactivate the instrumentation so that it has no effect.
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126 */
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127 public abstract void setEnabled(boolean enabled);
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128
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129 /**
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130 * Is this breakpoint active?
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131 */
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132 public abstract boolean isEnabled();
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133
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134 /**
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135 * Sets the condition on this breakpoint, {@code null} to make it unconditional.
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136 *
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137 * @param expr if non{@code -null}, a boolean expression, expressed in the guest language, to be
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138 * evaluated in the lexical context at the breakpoint location.
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139 * @throws IOException if condition is invalid
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140 * @throws UnsupportedOperationException if the breakpoint does not support conditions
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141 */
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142 public abstract void setCondition(String expr) throws IOException;
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143
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144 /**
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145 * Gets the text that defines the current condition on this breakpoint; {@code null} if this
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146 * breakpoint is currently unconditional.
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147 */
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148 public Source getCondition() {
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149 return null;
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150 }
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151
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152 /**
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153 * Does this breakpoint remove itself after first activation?
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154 */
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155 public final boolean isOneShot() {
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156 return isOneShot;
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157 }
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158
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159 /**
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160 * Gets the number of hits left to be ignored before halting.
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161 */
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162 public final int getIgnoreCount() {
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163 return ignoreCount;
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164 }
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165
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166 /**
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167 * Change the threshold for when this breakpoint should start causing a break. When both an
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168 * ignore count and a {@linkplain #setCondition(String) condition} are specified, the condition
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169 * is evaluated first: if {@code false} it is not considered to be a hit. In other words, the
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170 * ignore count is for successful conditions only.
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171 */
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172 public final void setIgnoreCount(int ignoreCount) {
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173 this.ignoreCount = ignoreCount;
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174 }
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175
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176 /**
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177 * Number of times this breakpoint has reached, with one exception; if the breakpoint has a
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178 * condition that evaluates to {@code false}, it does not count as a hit.
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179 */
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180 public final int getHitCount() {
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181 return hitCount;
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182 }
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183
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184 /**
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185 * Disables this breakpoint and removes any associated instrumentation; it becomes permanently
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186 * inert.
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187 */
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188 public abstract void dispose();
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189
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190 /**
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191 * Gets a human-sensible description of this breakpoint's location in a {@link Source}.
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192 */
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193 public abstract String getLocationDescription();
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194
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195 public final State getState() {
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196 return state;
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197 }
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198
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199 final void assertState(State s) {
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200 assert state == s;
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201 }
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202
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203 final void setState(State state) {
22003
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204 this.state = state;
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205 }
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206
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207 /**
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208 * Assumes that all conditions for causing the break have been satisfied, so increments the
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209 * <em>hit count</em>. Then checks if the <em>ignore count</em> has been exceeded, and if so
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210 * returns {@code true}. If not, it still counts as a <em>hit</em> but should be ignored.
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211 *
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212 * @return whether to proceed
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213 */
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214 final boolean incrHitCountCheckIgnore() {
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215 return ++hitCount > ignoreCount;
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216 }
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217
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218 @Override
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219 public String toString() {
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220 final StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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221 sb.append(" state=");
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222 sb.append(getState() == null ? "<none>" : getState().getName());
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223 if (isOneShot()) {
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224 sb.append(", " + "One-Shot");
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225 }
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226 if (getCondition() != null) {
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227 sb.append(", condition=\"" + getCondition() + "\"");
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228 }
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229 return sb.toString();
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230 }
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231 }