annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/TagBreakpointFactory.java @ 22066:78c3d3d8d86e

Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 06 Aug 2015 08:31:49 +0200
parents 95d5d6a93968
children c2cb9f1c8688
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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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27 import static com.oracle.truffle.api.debug.Breakpoint.State.*;
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28
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29 import java.io.*;
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30 import java.util.*;
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31 import java.util.Map.Entry;
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32
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33 import com.oracle.truffle.api.*;
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34 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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35 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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36 import com.oracle.truffle.api.debug.Debugger.BreakpointCallback;
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37 import com.oracle.truffle.api.debug.Debugger.WarningLog;
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38 import com.oracle.truffle.api.frame.*;
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39 import com.oracle.truffle.api.instrument.*;
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40 import com.oracle.truffle.api.instrument.impl.*;
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41 import com.oracle.truffle.api.nodes.*;
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42 import com.oracle.truffle.api.utilities.*;
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43
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44 // TODO (mlvdv) some common functionality could be factored out of this and LineBreakpointSupport
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45
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46 /**
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47 * Support class for creating and managing "Tag Breakpoints". A Tag Breakpoint halts execution just
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48 * before reaching any node whose Probe carries a specified {@linkplain SyntaxTag Tag}.
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49 * <p>
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50 * The {@linkplain Probe#setBeforeTagTrap(SyntaxTagTrap) Tag Trap}, which is built directly into the
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51 * Instrumentation Framework, does the same thing more efficiently, but there may only be one Tag
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52 * Trap active at a time. Any number of tag breakpoints may coexist with the Tag Trap, but it would
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53 * be confusing to have a Tag Breakpoint set for the same Tag as the current Tag Trap.
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54 * <p>
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55 * Notes:
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56 * <ol>
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57 * <li>Only one Tag Breakpoint can be active for a specific {@linkplain SyntaxTag Tag}.</li>
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58 * <li>A newly created breakpoint looks for probes matching the tag, attaches to them if found by
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59 * installing an {@link Instrument}.</li>
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60 * <li>When Truffle "splits" or otherwise copies an AST, any attached {@link Instrument} will be
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61 * copied along with the rest of the AST and will call back to the same breakpoint.</li>
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62 * <li>When notification is received that the breakpoint's Tag has been newly added to a Node, then
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63 * the breakpoint will attach a new Instrument at the probe to activate the breakpoint at that
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64 * location.</li>
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65 * <li>A breakpoint may have multiple Instruments deployed, one attached to each Probe that holds
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66 * the breakpoint's tag; this might happen when a source is reloaded.</li>
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67 * </ol>
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68 */
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69 final class TagBreakpointFactory {
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70
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71 private static final boolean TRACE = false;
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72 private static final PrintStream OUT = System.out;
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73
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74 private static final String BREAKPOINT_NAME = "TAG BREAKPOINT";
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75
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76 @TruffleBoundary
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77 private static void trace(String format, Object... args) {
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78 if (TRACE) {
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79 OUT.println(String.format("%s: %s", BREAKPOINT_NAME, String.format(format, args)));
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80 }
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81 }
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82
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83 private static final Comparator<Entry<SyntaxTag, TagBreakpointImpl>> BREAKPOINT_COMPARATOR = new Comparator<Entry<SyntaxTag, TagBreakpointImpl>>() {
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84
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85 @Override
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86 public int compare(Entry<SyntaxTag, TagBreakpointImpl> entry1, Entry<SyntaxTag, TagBreakpointImpl> entry2) {
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87 return entry1.getKey().name().compareTo(entry2.getKey().name());
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88 }
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89 };
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90
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91 private final BreakpointCallback breakpointCallback;
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92 private final WarningLog warningLog;
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93
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94 /**
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95 * Map: Tags ==> Tag Breakpoints. There may be no more than one breakpoint per Tag.
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96 */
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97 private final Map<SyntaxTag, TagBreakpointImpl> tagToBreakpoint = new HashMap<>();
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98
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99 /**
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100 * Globally suspends all line breakpoint activity when {@code false}, ignoring whether
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101 * individual breakpoints are enabled.
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102 */
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103 @CompilationFinal private boolean breakpointsActive = true;
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104 private final CyclicAssumption breakpointsActiveUnchanged = new CyclicAssumption(BREAKPOINT_NAME + " globally active");
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105
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Jaroslav Tulach <jaroslav.tulach@oracle.com>
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106 TagBreakpointFactory(BreakpointCallback breakpointCallback, final WarningLog warningLog) {
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107 this.breakpointCallback = breakpointCallback;
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108 this.warningLog = warningLog;
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109
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110 Probe.addProbeListener(new DefaultProbeListener() {
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111
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112 @Override
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113 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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114 final TagBreakpointImpl breakpoint = tagToBreakpoint.get(tag);
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115 if (breakpoint != null) {
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116 try {
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117 breakpoint.attach(probe);
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118 } catch (IOException e) {
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119 warningLog.addWarning(BREAKPOINT_NAME + " failure attaching to newly tagged Probe: " + e.getMessage());
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120 if (TRACE) {
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121 OUT.println(BREAKPOINT_NAME + " failure: " + e.getMessage());
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122 }
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123 }
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124 }
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125 }
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126 });
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127 }
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128
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129 /**
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130 * Globally enables tag breakpoint activity; all breakpoints are ignored when set to
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131 * {@code false}. When set to {@code true}, the enabled/disabled status of each breakpoint
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132 * determines whether it will trigger when flow of execution reaches it.
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133 *
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134 * @param breakpointsActive
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135 */
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136 void setActive(boolean breakpointsActive) {
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137 if (this.breakpointsActive != breakpointsActive) {
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138 breakpointsActiveUnchanged.invalidate();
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139 this.breakpointsActive = breakpointsActive;
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140 }
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141 }
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142
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143 /**
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144 * Gets all current tag breakpoints,regardless of status; sorted and modification safe.
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145 */
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146 List<TagBreakpoint> getAll() {
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147 ArrayList<Entry<SyntaxTag, TagBreakpointImpl>> entries = new ArrayList<>(tagToBreakpoint.entrySet());
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148 Collections.sort(entries, BREAKPOINT_COMPARATOR);
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149
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150 final ArrayList<TagBreakpoint> breakpoints = new ArrayList<>(entries.size());
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151 for (Entry<SyntaxTag, TagBreakpointImpl> entry : entries) {
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152 breakpoints.add(entry.getValue());
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153 }
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154 return breakpoints;
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155 }
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156
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157 /**
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158 * Creates a new tag breakpoint if one doesn't already exist. If one does exist, then resets the
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159 * <em>ignore count</em>.
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160 *
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161 * @param tag where to set the breakpoint
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162 * @param ignoreCount number of initial hits before the breakpoint starts causing breaks.
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163 * @param oneShot whether the breakpoint should dispose itself after one hit
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164 * @return a possibly new breakpoint
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165 * @throws IOException if a breakpoint already exists for the tag and the ignore count is the
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166 * same
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167 */
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168 TagBreakpoint create(int ignoreCount, SyntaxTag tag, boolean oneShot) throws IOException {
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169
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170 TagBreakpointImpl breakpoint = tagToBreakpoint.get(tag);
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171
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172 if (breakpoint == null) {
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173 breakpoint = new TagBreakpointImpl(ignoreCount, tag, oneShot);
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174
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175 if (TRACE) {
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176 trace("NEW " + breakpoint.getShortDescription());
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177 }
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178
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179 tagToBreakpoint.put(tag, breakpoint);
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180
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181 for (Probe probe : Probe.findProbesTaggedAs(tag)) {
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182 breakpoint.attach(probe);
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183 }
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184 } else {
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185 if (ignoreCount == breakpoint.getIgnoreCount()) {
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186 throw new IOException(BREAKPOINT_NAME + " already set for tag " + tag.name());
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187 }
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188 breakpoint.setIgnoreCount(ignoreCount);
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189 if (TRACE) {
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190 trace("CHANGED ignoreCount %s", breakpoint.getShortDescription());
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191 }
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192 }
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193 return breakpoint;
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194 }
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195
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196 /**
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197 * Returns the {@link TagBreakpoint} for a given tag, {@code null} if none.
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198 */
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199 TagBreakpoint get(SyntaxTag tag) {
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200 return tagToBreakpoint.get(tag);
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201 }
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202
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203 /**
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204 * Removes the associated instrumentation for all one-shot breakpoints only.
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205 */
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206 void disposeOneShots() {
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207 List<TagBreakpointImpl> breakpoints = new ArrayList<>(tagToBreakpoint.values());
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208 for (TagBreakpointImpl breakpoint : breakpoints) {
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209 if (breakpoint.isOneShot()) {
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210 breakpoint.dispose();
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211 }
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212 }
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213 }
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214
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215 /**
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216 * Removes all knowledge of a breakpoint, presumed disposed.
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217 */
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218 private void forget(TagBreakpointImpl breakpoint) {
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219 tagToBreakpoint.remove(breakpoint.getTag());
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220 }
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221
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222 /**
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223 * Concrete representation of a line breakpoint, implemented by attaching an instrument to a
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224 * probe at the designated source location.
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225 */
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226 private final class TagBreakpointImpl extends TagBreakpoint implements AdvancedInstrumentResultListener {
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227
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228 private static final String SHOULD_NOT_HAPPEN = "TagBreakpointImpl: should not happen";
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229
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230 private final SyntaxTag tag;
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231
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232 // Cached assumption that the global status of tag breakpoint activity has not changed.
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233 private Assumption breakpointsActiveAssumption;
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234
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235 // Whether this breakpoint is enable/disabled
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236 @CompilationFinal private boolean isEnabled;
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237 private Assumption enabledUnchangedAssumption;
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238
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239 private String conditionExpr;
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240
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241 /**
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242 * The instrument(s) that this breakpoint currently has attached to a {@link Probe}:
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243 * {@code null} if not attached.
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244 */
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245 private List<Instrument> instruments = new ArrayList<>();
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246
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247 private TagBreakpointImpl(int ignoreCount, SyntaxTag tag, boolean oneShot) {
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248 super(ENABLED, ignoreCount, oneShot);
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249 this.tag = tag;
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250 this.breakpointsActiveAssumption = TagBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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251 this.isEnabled = true;
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252 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption(BREAKPOINT_NAME + " enabled state unchanged");
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253 }
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254
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255 @Override
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256 public boolean isEnabled() {
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257 return isEnabled;
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258 }
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259
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260 @Override
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261 public void setEnabled(boolean enabled) {
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262 // Tag Breakpoints are never unresolved
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263 if (enabled != isEnabled) {
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264 switch (getState()) {
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265 case ENABLED:
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266 assert !enabled : SHOULD_NOT_HAPPEN;
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267 doSetEnabled(false);
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268 changeState(DISABLED);
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269 break;
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270 case DISABLED:
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271 assert enabled : SHOULD_NOT_HAPPEN;
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272 doSetEnabled(true);
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273 changeState(ENABLED);
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274 break;
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275 case DISPOSED:
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276 assert false : "breakpoint disposed";
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277 break;
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278 case ENABLED_UNRESOLVED:
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279 case DISABLED_UNRESOLVED:
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280 default:
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281 assert false : SHOULD_NOT_HAPPEN;
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282 break;
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283 }
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284 }
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285 }
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286
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287 @Override
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288 public void setCondition(String expr) throws IOException {
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289 if (this.conditionExpr != null || expr != null) {
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290 // De-instrument the Probes instrumented by this breakpoint
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291 final ArrayList<Probe> probes = new ArrayList<>();
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292 for (Instrument instrument : instruments) {
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293 probes.add(instrument.getProbe());
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294 instrument.dispose();
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295 }
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296 instruments.clear();
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297 this.conditionExpr = expr;
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298 // Re-instrument the probes previously instrumented
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299 for (Probe probe : probes) {
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300 attach(probe);
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301 }
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302 }
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303 }
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304
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305 @Override
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306 public String getCondition() {
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307 return conditionExpr;
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308 }
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309
22011
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310 @TruffleBoundary
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311 @Override
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312 public void dispose() {
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313 if (getState() != DISPOSED) {
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314 for (Instrument instrument : instruments) {
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315 instrument.dispose();
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316 }
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317 changeState(DISPOSED);
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318 TagBreakpointFactory.this.forget(this);
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319 }
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320 }
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321
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322 private void attach(Probe newProbe) throws IOException {
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323 if (getState() == DISPOSED) {
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324 throw new IllegalStateException("Attempt to attach a disposed " + BREAKPOINT_NAME);
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325 }
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326 Instrument newInstrument = null;
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327 if (conditionExpr == null) {
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328 newInstrument = Instrument.create(new UnconditionalTagBreakInstrumentListener(), BREAKPOINT_NAME);
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329 } else {
22066
78c3d3d8d86e Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
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330 newInstrument = Instrument.create(this, Debugger.createAdvancedInstrumentRootFactory(newProbe, conditionExpr, this), Boolean.class, BREAKPOINT_NAME);
22003
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331 }
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332 newProbe.attach(newInstrument);
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333 instruments.add(newInstrument);
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334 changeState(isEnabled ? ENABLED : DISABLED);
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335 }
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336
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337 private void doSetEnabled(boolean enabled) {
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338 if (this.isEnabled != enabled) {
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339 enabledUnchangedAssumption.invalidate();
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340 this.isEnabled = enabled;
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341 }
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342 }
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343
22011
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344 @TruffleBoundary
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345 private String getShortDescription() {
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346 return BREAKPOINT_NAME + "@" + tag.name();
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347 }
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348
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349 private void changeState(State after) {
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350 if (TRACE) {
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351 trace("STATE %s-->%s %s", getState().getName(), after.getName(), getShortDescription());
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352 }
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353 setState(after);
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354 }
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355
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356 private void doBreak(Node node, VirtualFrame vFrame) {
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357 if (incrHitCountCheckIgnore()) {
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358 breakpointCallback.haltedAt(node, vFrame.materialize(), BREAKPOINT_NAME);
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359 }
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360 }
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361
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362 /**
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363 * Receives notification from the attached instrument that execution is about to enter node
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364 * where the breakpoint is set. Designed so that when in the fast path, there is either an
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365 * unconditional "halt" call to the debugger or nothing.
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366 */
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367 private void nodeEnter(Node astNode, VirtualFrame vFrame) {
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368
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369 // Deopt if the global active/inactive flag has changed
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370 try {
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371 this.breakpointsActiveAssumption.check();
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372 } catch (InvalidAssumptionException ex) {
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373 this.breakpointsActiveAssumption = TagBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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374 }
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375
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376 // Deopt if the enabled/disabled state of this breakpoint has changed
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377 try {
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378 this.enabledUnchangedAssumption.check();
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379 } catch (InvalidAssumptionException ex) {
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380 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption("LineBreakpoint enabled state unchanged");
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381 }
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382
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383 if (TagBreakpointFactory.this.breakpointsActive && this.isEnabled) {
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384 if (isOneShot()) {
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385 dispose();
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386 }
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387 TagBreakpointImpl.this.doBreak(astNode, vFrame);
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388 }
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389
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390 }
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391
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392 public void notifyResult(Node node, VirtualFrame vFrame, Object result) {
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393 final boolean condition = (Boolean) result;
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394 if (TRACE) {
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395 trace("breakpoint condition = %b %s", condition, getShortDescription());
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396 }
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397 if (condition) {
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398 nodeEnter(node, vFrame);
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399 }
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400 }
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401
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402 public void notifyFailure(Node node, VirtualFrame vFrame, RuntimeException ex) {
22011
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403 addExceptionWarning(ex);
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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404 if (TRACE) {
22011
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405 trace("breakpoint failure = %s %s", ex, getShortDescription());
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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406 }
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407 // Take the breakpoint if evaluation fails.
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408 nodeEnter(node, vFrame);
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409 }
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410
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411 @TruffleBoundary
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412 private void addExceptionWarning(RuntimeException ex) {
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413 warningLog.addWarning(String.format("Exception in %s: %s", getShortDescription(), ex.getMessage()));
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414 }
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415
22003
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416 @Override
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417 public String getLocationDescription() {
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418 return "Tag " + tag.name();
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419 }
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420
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421 @Override
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422 public SyntaxTag getTag() {
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423 return tag;
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424 }
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425
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426 private final class UnconditionalTagBreakInstrumentListener extends DefaultStandardInstrumentListener {
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427
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428 @Override
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429 public void enter(Probe probe, Node node, VirtualFrame vFrame) {
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diff changeset
430 TagBreakpointImpl.this.nodeEnter(node, vFrame);
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431 }
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432 }
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433
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434 }
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435
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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436 }