annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/Breakpoint.java @ 22255:e7643754d982

Truffle/Instrumentation: rename Instrument to ProbeInstrument to distinguish from another kind to be added.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Fri, 25 Sep 2015 14:58:35 -0700
parents dc83cc1f94f2
children 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.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.Probe;
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32 import com.oracle.truffle.api.source.Source;
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33
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34 /**
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35 * Breakpoint in a {@link com.oracle.truffle.api.vm.TruffleVM} with
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36 * {@link com.oracle.truffle.api.debug debugging turned on}. You can ask
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37 * {@link Debugger#setLineBreakpoint(int, com.oracle.truffle.api.source.LineLocation, boolean)} or
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38 * {@link Debugger#setTagBreakpoint(int, com.oracle.truffle.api.instrument.SyntaxTag, boolean)} to
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39 * create an instance of {@link Breakpoint}.
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40 */
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41 @SuppressWarnings("javadoc")
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42 public abstract class Breakpoint {
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43
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44 /**
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45 * A general model of the states occupied by a {@link Breakpoint} during its lifetime.
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46 */
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47 public enum State {
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48
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49 /**
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50 * Not attached, enabled.
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51 * <p>
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52 * Created for a source location but not yet attached: perhaps just created and the source
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53 * hasn't been loaded yet; perhaps source has been loaded, but the line location isn't
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54 * probed so a breakpoint cannot be attached. Can be either enabled or disabled.
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55 */
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56 ENABLED_UNRESOLVED("Enabled/Unresolved"),
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57
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58 /**
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59 * Not attached, disabled.
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60 * <p>
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61 * Created for a source location but not yet attached: perhaps just created and the source
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62 * hasn't been loaded yet; perhaps source has been loaded, but the line location isn't
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63 * probed so a breakpoint cannot be attached.
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64 */
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65 DISABLED_UNRESOLVED("Disabled/Unresolved"),
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66
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67 /**
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68 * Attached, instrument enabled.
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69 * <p>
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70 * Is currently implemented by some {@link Instrument}, which is attached to a {@link Probe}
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71 * at a specific node in the AST, and the breakpoint is enabled.
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72 */
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73 ENABLED("Enabled"),
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74
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75 /**
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76 * Attached, instrument disabled.
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77 * <p>
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78 * Is currently implemented by some {@link Instrument}, which is attached to a {@link Probe}
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79 * at a specific node in the AST, and the breakpoint is disabled.
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80 */
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81 DISABLED("Disabled"),
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82
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83 /**
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84 * Not attached, instrument is permanently disabled.
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85 */
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86 DISPOSED("Disposed");
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87
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88 private final String name;
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89
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90 State(String name) {
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91 this.name = name;
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92 }
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93
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94 public String getName() {
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95 return name;
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96 }
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97
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98 @Override
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99 public String toString() {
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100 return name;
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101 }
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102
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103 }
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104
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105 private final boolean isOneShot;
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106
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107 private int ignoreCount;
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108
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109 private int hitCount;
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110
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111 private State state;
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112
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113 Breakpoint(State state, int ignoreCount, boolean isOneShot) {
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114 this.state = state;
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115 this.isOneShot = isOneShot;
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116 this.ignoreCount = ignoreCount;
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117 }
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118
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119 /**
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120 * Enables or disables this breakpoint's AST instrumentation. The breakpoint is enabled by
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121 * default.
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122 *
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123 * @param enabled <code>true</code> to activate the instrumentation, <code>false</code> to
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124 * deactivate the instrumentation so that it has no effect.
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125 */
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126 public abstract void setEnabled(boolean enabled);
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127
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128 /**
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129 * Is this breakpoint active?
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130 */
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131 public abstract boolean isEnabled();
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132
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133 /**
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134 * Sets the condition on this breakpoint, {@code null} to make it unconditional.
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135 *
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136 * @param expr if non{@code -null}, a boolean expression, expressed in the guest language, to be
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137 * evaluated in the lexical context at the breakpoint location.
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138 * @throws IOException if condition is invalid
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139 * @throws UnsupportedOperationException if the breakpoint does not support conditions
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140 */
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141 public abstract void setCondition(String expr) throws IOException;
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142
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143 /**
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144 * Gets the string, expressed in the Guest Language, that defines the current condition on this
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145 * breakpoint; {@code null} if this breakpoint is currently unconditional.
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146 */
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147 public String getCondition() {
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148 return null;
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149 }
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150
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151 /**
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152 * Does this breakpoint remove itself after first activation?
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153 */
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154 public final boolean isOneShot() {
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155 return isOneShot;
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156 }
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157
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158 /**
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159 * Gets the number of hits left to be ignored before halting.
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160 */
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161 public final int getIgnoreCount() {
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162 return ignoreCount;
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163 }
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164
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165 /**
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166 * Change the threshold for when this breakpoint should start causing a break. When both an
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167 * ignore count and a {@linkplain #setCondition(String) condition} are specified, the condition
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168 * is evaluated first: if {@code false} it is not considered to be a hit. In other words, the
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169 * ignore count is for successful conditions only.
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170 */
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171 public final void setIgnoreCount(int ignoreCount) {
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172 this.ignoreCount = ignoreCount;
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173 }
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174
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175 /**
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176 * Number of times this breakpoint has reached, with one exception; if the breakpoint has a
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177 * condition that evaluates to {@code false}, it does not count as a hit.
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178 */
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179 public final int getHitCount() {
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180 return hitCount;
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181 }
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182
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183 /**
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184 * Disables this breakpoint and removes any associated instrumentation; it becomes permanently
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185 * inert.
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186 */
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187 public abstract void dispose();
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188
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189 /**
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190 * Gets a human-sensible description of this breakpoint's location in a {@link Source}.
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191 */
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192 public abstract String getLocationDescription();
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193
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194 public final State getState() {
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195 return state;
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196 }
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197
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198 final void assertState(State s) {
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199 assert state == s;
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200 }
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201
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202 final void setState(State state) {
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203 this.state = state;
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204 }
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205
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206 /**
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207 * Assumes that all conditions for causing the break have been satisfied, so increments the
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208 * <em>hit count</em>. Then checks if the <em>ignore count</em> has been exceeded, and if so
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209 * returns {@code true}. If not, it still counts as a <em>hit</em> but should be ignored.
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210 *
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211 * @return whether to proceed
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212 */
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213 final boolean incrHitCountCheckIgnore() {
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214 return ++hitCount > ignoreCount;
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215 }
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216
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217 @Override
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218 public String toString() {
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219 final StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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220 sb.append(" state=");
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221 sb.append(getState() == null ? "<none>" : getState().getName());
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222 if (isOneShot()) {
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223 sb.append(", " + "One-Shot");
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224 }
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225 if (getCondition() != null) {
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226 sb.append(", condition=\"" + getCondition() + "\"");
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227 }
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228 return sb.toString();
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229 }
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230 }