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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/SuspendedEvent.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents f879b1fe3773
children dcb70d90c11d
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22003
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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 com.oracle.truffle.api.CompilerDirectives;
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28 import com.oracle.truffle.api.Truffle;
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29 import com.oracle.truffle.api.frame.FrameInstance;
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30 import com.oracle.truffle.api.frame.FrameInstanceVisitor;
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31 import com.oracle.truffle.api.frame.MaterializedFrame;
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32 import com.oracle.truffle.api.instrument.StandardSyntaxTag;
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33 import com.oracle.truffle.api.nodes.Node;
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34 import java.util.ArrayList;
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35 import java.util.Collections;
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36 import java.util.List;
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37
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38 /**
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39 * This event is delivered to all
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40 * {@link com.oracle.truffle.api.vm.TruffleVM.Builder#onEvent(com.oracle.truffle.api.vm.EventConsumer)
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41 * registered event handlers} when an execution is suspended on a
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42 * {@link Debugger#setLineBreakpoint(int, com.oracle.truffle.api.source.LineLocation, boolean)
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43 * breakpoint} or during {@link #prepareStepInto(int) stepping}. Methods in this event can only be
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44 * used while the handlers process the event. Then the state of the event becomes invalid and
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45 * subsequent calls to the event methods yield {@link IllegalStateException}. One can call
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46 * {@link #getDebugger()} and keep reference to it for as long as necessary.
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47 */
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48 @SuppressWarnings("javadoc")
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49 public final class SuspendedEvent {
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50 private final List<String> recentWarnings;
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51 private final MaterializedFrame mFrame;
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52 private final Node astNode;
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53 private final List<FrameInstance> frames;
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54 private final Debugger debugger;
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55
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56 SuspendedEvent(Debugger prepares, Node astNode, MaterializedFrame mFrame, List<String> recentWarnings, final int stackDepth) {
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57 this.debugger = prepares;
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58 this.astNode = astNode;
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59 this.mFrame = mFrame;
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60 this.recentWarnings = recentWarnings;
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61
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62 this.frames = new ArrayList<>();
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63 // Map the Truffle stack for this execution, ignore nested executions
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64 // The top (current) frame is not produced by the iterator.
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65 frames.add(Truffle.getRuntime().getCurrentFrame());
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66 Truffle.getRuntime().iterateFrames(new FrameInstanceVisitor<FrameInstance>() {
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67 int frameCount = 1;
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68
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69 @Override
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70 public FrameInstance visitFrame(FrameInstance frameInstance) {
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71 if (frameCount < stackDepth) {
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72 frames.add(frameInstance);
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73 frameCount++;
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74 return null;
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75 }
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76 return frameInstance;
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77 }
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78 });
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79
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80 }
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81
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82 /**
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83 * Debugger associated with the just suspended execution. This debugger remains valid after the
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84 * event is processed, it is possible and suggested to keep a reference to it and use it any
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85 * time later when evaluating sources in the {@link com.oracle.truffle.api.vm.TruffleVM}.
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86 *
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87 * @return instance of debugger associated with the just suspended execution and any subsequent
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88 * ones in the same {@link com.oracle.truffle.api.vm.TruffleVM}.
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89 */
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90 public Debugger getDebugger() {
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91 return debugger;
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92 }
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93
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94 public Node getNode() {
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95 return astNode;
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96 }
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97
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98 public MaterializedFrame getFrame() {
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99 return mFrame;
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100 }
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101
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102 public List<String> getRecentWarnings() {
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103 return Collections.unmodifiableList(recentWarnings);
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104 }
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105
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106 /**
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107 * Gets the stack frames from the currently halted {@link com.oracle.truffle.api.vm.TruffleVM}
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108 * execution.
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109 *
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110 * @return list of stack frames
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111 */
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112 @CompilerDirectives.TruffleBoundary
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113 public List<FrameInstance> getStack() {
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114 return Collections.unmodifiableList(frames);
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115 }
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116
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117 /**
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118 * Prepare to execute in Continue mode when guest language program execution resumes. In this
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119 * mode:
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120 * <ul>
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121 * <li>Execution will continue until either:
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122 * <ol>
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123 * <li>execution arrives at a node to which an enabled breakpoint is attached,
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124 * <strong>or:</strong></li>
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125 * <li>execution completes.</li>
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126 * </ol>
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127 * </ul>
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128 */
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129 public void prepareContinue() {
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130 debugger.prepareContinue();
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131 }
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132
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133 /**
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134 * Prepare to execute in StepInto mode when guest language program execution resumes. In this
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135 * mode:
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136 * <ul>
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137 * <li>User breakpoints are disabled.</li>
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138 * <li>Execution will continue until either:
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139 * <ol>
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140 * <li>execution arrives at a node with the tag {@linkplain StandardSyntaxTag#STATEMENT
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141 * STATMENT}, <strong>or:</strong></li>
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142 * <li>execution completes.</li>
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143 * </ol>
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144 * <li>StepInto mode persists only through one resumption (i.e. {@code stepIntoCount} steps),
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145 * and reverts by default to Continue mode.</li>
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146 * </ul>
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147 *
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148 * @param stepCount the number of times to perform StepInto before halting
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149 * @throws IllegalArgumentException if the specified number is {@code <= 0}
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150 */
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151 public void prepareStepInto(int stepCount) {
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152 debugger.prepareStepInto(stepCount);
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153 }
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154
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155 /**
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156 * Prepare to execute in StepOut mode when guest language program execution resumes. In this
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157 * mode:
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158 * <ul>
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159 * <li>User breakpoints are enabled.</li>
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160 * <li>Execution will continue until either:
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161 * <ol>
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162 * <li>execution arrives at the nearest enclosing call site on the stack, <strong>or</strong></li>
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163 * <li>execution completes.</li>
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164 * </ol>
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165 * <li>StepOut mode persists only through one resumption, and reverts by default to Continue
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166 * mode.</li>
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167 * </ul>
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168 */
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169 public void prepareStepOut() {
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170 debugger.prepareStepOut();
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171 }
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172
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173 /**
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174 * Prepare to execute in StepOver mode when guest language program execution resumes. In this
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175 * mode:
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176 * <ul>
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177 * <li>Execution will continue until either:
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178 * <ol>
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179 * <li>execution arrives at a node with the tag {@linkplain StandardSyntaxTag#STATEMENT
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180 * STATEMENT} when not nested in one or more function/method calls, <strong>or:</strong></li>
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181 * <li>execution arrives at a node to which a breakpoint is attached and when nested in one or
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182 * more function/method calls, <strong>or:</strong></li>
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183 * <li>execution completes.</li>
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184 * </ol>
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185 * <li>StepOver mode persists only through one resumption (i.e. {@code stepOverCount} steps),
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186 * and reverts by default to Continue mode.</li>
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187 * </ul>
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188 *
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189 * @param stepCount the number of times to perform StepInto before halting
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190 * @throws IllegalArgumentException if the specified number is {@code <= 0}
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191 */
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192 public void prepareStepOver(int stepCount) {
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193 debugger.prepareStepOver(stepCount);
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194 }
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195 }