annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/LineBreakpointFactory.java @ 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.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Sat, 18 Jul 2015 18:03:36 +0200
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children 95d5d6a93968
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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 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.source.*;
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43 import com.oracle.truffle.api.utilities.*;
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44
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45 //TODO (mlvdv) some common functionality could be factored out of this and TagBreakpointSupport
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46
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47 /**
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48 * Support class for creating and managing all existing ordinary (user visible) line breakpoints.
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49 * <p>
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50 * Notes:
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51 * <ol>
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52 * <li>Line breakpoints can only be set at nodes tagged as {@link StandardSyntaxTag#STATEMENT}.</li>
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53 * <li>A newly created breakpoint looks for probes matching the location, attaches to them if found
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54 * by installing an {@link Instrument} that calls back to the breakpoint.</li>
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55 * <li>When Truffle "splits" or otherwise copies an AST, any attached {@link Instrument} will be
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56 * copied along with the rest of the AST and will call back to the same breakpoint.</li>
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57 * <li>When notification is received of a new Node being tagged as a statement, and if a
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58 * breakpoint's line location matches the Probe's line location, then the breakpoint will attach a
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59 * new Instrument at the probe to activate the breakpoint at that location.</li>
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60 * <li>A breakpoint may have multiple Instruments deployed, one attached to each Probe that matches
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61 * the breakpoint's line location; this might happen when a source is reloaded.</li>
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62 * </ol>
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63 *
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64 */
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65 final class LineBreakpointFactory {
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66
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67 private static final boolean TRACE = false;
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68 private static final PrintStream OUT = System.out;
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69
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70 private static final String BREAKPOINT_NAME = "LINE BREAKPOINT";
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71
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72 private static void trace(String format, Object... args) {
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73 if (TRACE) {
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74 OUT.println(String.format("%s: %s", BREAKPOINT_NAME, String.format(format, args)));
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75 }
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76 }
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77
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78 private static final Comparator<Entry<LineLocation, LineBreakpointImpl>> BREAKPOINT_COMPARATOR = new Comparator<Entry<LineLocation, LineBreakpointImpl>>() {
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79
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80 @Override
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81 public int compare(Entry<LineLocation, LineBreakpointImpl> entry1, Entry<LineLocation, LineBreakpointImpl> entry2) {
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82 final LineLocation line1 = entry1.getKey();
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83 final LineLocation line2 = entry2.getKey();
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84 final int nameOrder = line1.getSource().getShortName().compareTo(line2.getSource().getShortName());
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85 if (nameOrder != 0) {
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86 return nameOrder;
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87 }
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88 return Integer.compare(line1.getLineNumber(), line2.getLineNumber());
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89 }
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90 };
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91
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92 private final Debugger executionSupport;
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93 private final BreakpointCallback breakpointCallback;
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94 private final WarningLog warningLog;
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95
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96 /**
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97 * Map: Source lines ==> attached breakpoints. There may be no more than one line breakpoint
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98 * associated with a line.
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99 */
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100 private final Map<LineLocation, LineBreakpointImpl> lineToBreakpoint = new HashMap<>();
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101
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102 /**
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103 * A map of {@link LineLocation} to a collection of {@link Probe}s. This list must be
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104 * initialized and filled prior to being used by this class.
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105 */
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106 private final LineToProbesMap lineToProbesMap;
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107
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108 /**
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109 * Globally suspends all line breakpoint activity when {@code false}, ignoring whether
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110 * individual breakpoints are enabled.
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111 */
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112 @CompilationFinal private boolean breakpointsActive = true;
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113 private final CyclicAssumption breakpointsActiveUnchanged = new CyclicAssumption(BREAKPOINT_NAME + " globally active");
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114
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115 LineBreakpointFactory(Debugger executionSupport, BreakpointCallback breakpointCallback, final WarningLog warningLog) {
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116 this.executionSupport = executionSupport;
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117 this.breakpointCallback = breakpointCallback;
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118 this.warningLog = warningLog;
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119
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120 lineToProbesMap = new LineToProbesMap();
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121 lineToProbesMap.install();
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122
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123 Probe.addProbeListener(new DefaultProbeListener() {
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124
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125 @Override
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126 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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127 if (tag == StandardSyntaxTag.STATEMENT) {
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128 final SourceSection sourceSection = probe.getProbedSourceSection();
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129 if (sourceSection != null) {
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130 final LineLocation lineLocation = sourceSection.getLineLocation();
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131 if (lineLocation != null) {
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132 // A Probe with line location tagged STATEMENT we haven't seen before.
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133 final LineBreakpointImpl breakpoint = lineToBreakpoint.get(lineLocation);
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134 if (breakpoint != null) {
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135 try {
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136 breakpoint.attach(probe);
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137 } catch (IOException e) {
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138 warningLog.addWarning(BREAKPOINT_NAME + " failure attaching to newly tagged Probe: " + e.getMessage());
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139 if (TRACE) {
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140 OUT.println(BREAKPOINT_NAME + " failure: " + e.getMessage());
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141 }
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142 }
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143 }
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144 }
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145 }
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146 }
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147 }
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148 });
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149 }
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150
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151 /**
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152 * Globally enables line breakpoint activity; all breakpoints are ignored when set to
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153 * {@code false}. When set to {@code true}, the enabled/disabled status of each breakpoint
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154 * determines whether it will trigger when flow of execution reaches it.
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155 *
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156 * @param breakpointsActive
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157 */
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158 void setActive(boolean breakpointsActive) {
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159 if (this.breakpointsActive != breakpointsActive) {
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160 breakpointsActiveUnchanged.invalidate();
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161 this.breakpointsActive = breakpointsActive;
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162 }
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163 }
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164
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165 /**
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166 * Gets all current line breakpoints,regardless of status; sorted and modification safe.
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167 */
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168 List<LineBreakpoint> getAll() {
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169 ArrayList<Entry<LineLocation, LineBreakpointImpl>> entries = new ArrayList<>(lineToBreakpoint.entrySet());
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170 Collections.sort(entries, BREAKPOINT_COMPARATOR);
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171
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172 final ArrayList<LineBreakpoint> breakpoints = new ArrayList<>(entries.size());
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173 for (Entry<LineLocation, LineBreakpointImpl> entry : entries) {
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174 breakpoints.add(entry.getValue());
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175 }
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176 return breakpoints;
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177 }
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178
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179 /**
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180 * Creates a new line breakpoint if one doesn't already exist. If one does exist, then resets
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181 * the <em>ignore count</em>.
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182 *
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183 * @param lineLocation where to set the breakpoint
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184 * @param ignoreCount number of initial hits before the breakpoint starts causing breaks.
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185 * @param oneShot whether the breakpoint should dispose itself after one hit
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186 * @return a possibly new breakpoint
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187 * @throws IOException if a breakpoint already exists at the location and the ignore count is
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188 * the same
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189 */
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190 LineBreakpoint create(int ignoreCount, LineLocation lineLocation, boolean oneShot) throws IOException {
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191
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192 LineBreakpointImpl breakpoint = lineToBreakpoint.get(lineLocation);
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193
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194 if (breakpoint == null) {
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195 breakpoint = new LineBreakpointImpl(ignoreCount, lineLocation, oneShot);
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196
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197 if (TRACE) {
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198 trace("NEW " + breakpoint.getShortDescription());
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199 }
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200
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201 lineToBreakpoint.put(lineLocation, breakpoint);
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202
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203 for (Probe probe : lineToProbesMap.findProbes(lineLocation)) {
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204 if (probe.isTaggedAs(StandardSyntaxTag.STATEMENT)) {
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205 breakpoint.attach(probe);
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206 break;
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207 }
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208 }
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209 } else {
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210 if (ignoreCount == breakpoint.getIgnoreCount()) {
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211 throw new IOException(BREAKPOINT_NAME + " already set at line " + lineLocation);
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212 }
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213 breakpoint.setIgnoreCount(ignoreCount);
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214 if (TRACE) {
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215 trace("CHANGED ignoreCount %s", breakpoint.getShortDescription());
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216 }
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217 }
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218 return breakpoint;
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219 }
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220
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221 /**
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222 * Returns the {@link LineBreakpoint} for a given line. There should only ever be one breakpoint
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223 * per line.
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224 *
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225 * @param lineLocation The {@link LineLocation} to get the breakpoint for.
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226 * @return The breakpoint for the given line.
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227 */
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228 LineBreakpoint get(LineLocation lineLocation) {
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229 return lineToBreakpoint.get(lineLocation);
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230 }
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231
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232 /**
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233 * Removes the associated instrumentation for all one-shot breakpoints only.
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234 */
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235 void disposeOneShots() {
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236 List<LineBreakpointImpl> breakpoints = new ArrayList<>(lineToBreakpoint.values());
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237 for (LineBreakpointImpl breakpoint : breakpoints) {
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238 if (breakpoint.isOneShot()) {
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239 breakpoint.dispose();
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240 }
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241 }
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242 }
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243
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244 /**
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245 * Removes all knowledge of a breakpoint, presumed disposed.
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246 */
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247 private void forget(LineBreakpointImpl breakpoint) {
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248 lineToBreakpoint.remove(breakpoint.getLineLocation());
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249 }
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250
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251 /**
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252 * Concrete representation of a line breakpoint, implemented by attaching an instrument to a
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253 * probe at the designated source location.
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254 */
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255 private final class LineBreakpointImpl extends LineBreakpoint implements AdvancedInstrumentResultListener {
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256
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257 private static final String SHOULD_NOT_HAPPEN = "LineBreakpointImpl: should not happen";
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258
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259 private final LineLocation lineLocation;
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260
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261 // Cached assumption that the global status of line breakpoint activity has not changed.
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262 private Assumption breakpointsActiveAssumption;
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263
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264 // Whether this breakpoint is enable/disabled
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265 @CompilationFinal private boolean isEnabled;
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266 private Assumption enabledUnchangedAssumption;
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267
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268 private String conditionExpr;
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269
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270 /**
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271 * The instrument(s) that this breakpoint currently has attached to a {@link Probe}:
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272 * {@code null} if not attached.
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273 */
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274 private List<Instrument> instruments = new ArrayList<>();
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275
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276 public LineBreakpointImpl(int ignoreCount, LineLocation lineLocation, boolean oneShot) {
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277 super(ENABLED_UNRESOLVED, ignoreCount, oneShot);
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278 this.lineLocation = lineLocation;
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279
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280 this.breakpointsActiveAssumption = LineBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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281 this.isEnabled = true;
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282 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption(BREAKPOINT_NAME + " enabled state unchanged");
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283 }
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284
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285 @Override
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286 public boolean isEnabled() {
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287 return isEnabled;
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288 }
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289
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290 @Override
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291 public void setEnabled(boolean enabled) {
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292 if (enabled != isEnabled) {
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293 switch (getState()) {
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294 case ENABLED:
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295 assert !enabled : SHOULD_NOT_HAPPEN;
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296 doSetEnabled(false);
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297 changeState(DISABLED);
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298 break;
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299 case ENABLED_UNRESOLVED:
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300 assert !enabled : SHOULD_NOT_HAPPEN;
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301 doSetEnabled(false);
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302 changeState(DISABLED_UNRESOLVED);
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303 break;
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304 case DISABLED:
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305 assert enabled : SHOULD_NOT_HAPPEN;
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306 doSetEnabled(true);
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307 changeState(ENABLED);
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308 break;
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diff changeset
309 case DISABLED_UNRESOLVED:
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310 assert enabled : SHOULD_NOT_HAPPEN;
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311 doSetEnabled(true);
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312 changeState(DISABLED_UNRESOLVED);
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313 break;
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314 case DISPOSED:
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315 assert false : "breakpoint disposed";
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316 break;
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317 default:
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318 assert false : SHOULD_NOT_HAPPEN;
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319 break;
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320 }
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321 }
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322 }
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323
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diff changeset
324 @Override
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325 public void setCondition(String expr) throws IOException {
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326 if (this.conditionExpr != null || expr != null) {
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327 // De-instrument the Probes instrumented by this breakpoint
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328 final ArrayList<Probe> probes = new ArrayList<>();
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329 for (Instrument instrument : instruments) {
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330 probes.add(instrument.getProbe());
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331 instrument.dispose();
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332 }
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333 instruments.clear();
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diff changeset
334 this.conditionExpr = expr;
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335 // Re-instrument the probes previously instrumented
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336 for (Probe probe : probes) {
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diff changeset
337 attach(probe);
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338 }
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339 }
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340 }
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341
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342 @Override
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343 public String getCondition() {
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344 return conditionExpr;
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345 }
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346
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347 @Override
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348 public void dispose() {
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diff changeset
349 if (getState() != DISPOSED) {
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diff changeset
350 for (Instrument instrument : instruments) {
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diff changeset
351 instrument.dispose();
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352 }
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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diff changeset
353 changeState(DISPOSED);
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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diff changeset
354 LineBreakpointFactory.this.forget(this);
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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diff changeset
355 }
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diff changeset
356 }
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diff changeset
357
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diff changeset
358 private void attach(Probe newProbe) throws IOException {
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diff changeset
359 if (getState() == DISPOSED) {
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diff changeset
360 throw new IllegalStateException("Attempt to attach a disposed " + BREAKPOINT_NAME);
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diff changeset
361 }
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diff changeset
362 Instrument newInstrument = null;
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diff changeset
363 if (conditionExpr == null) {
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diff changeset
364 newInstrument = Instrument.create(new UnconditionalLineBreakInstrumentListener(), BREAKPOINT_NAME);
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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diff changeset
365 } else {
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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diff changeset
366 newInstrument = Instrument.create(this, executionSupport.createAdvancedInstrumentRootFactory(newProbe, conditionExpr, this), Boolean.class, BREAKPOINT_NAME);
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diff changeset
367 }
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diff changeset
368 newProbe.attach(newInstrument);
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diff changeset
369 instruments.add(newInstrument);
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diff changeset
370 changeState(isEnabled ? ENABLED : DISABLED);
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diff changeset
371 }
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diff changeset
372
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diff changeset
373 private void doSetEnabled(boolean enabled) {
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diff changeset
374 if (this.isEnabled != enabled) {
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diff changeset
375 enabledUnchangedAssumption.invalidate();
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diff changeset
376 this.isEnabled = enabled;
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diff changeset
377 }
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378 }
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diff changeset
379
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diff changeset
380 private String getShortDescription() {
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parents:
diff changeset
381 return BREAKPOINT_NAME + "@" + getLineLocation().getShortDescription();
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382 }
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383
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384 private void changeState(State after) {
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385 if (TRACE) {
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386 trace("STATE %s-->%s %s", getState().getName(), after.getName(), getShortDescription());
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387 }
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388 setState(after);
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389 }
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390
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391 private void doBreak(Node node, VirtualFrame vFrame) {
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392 if (incrHitCountCheckIgnore()) {
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393 breakpointCallback.haltedAt(node, vFrame.materialize(), BREAKPOINT_NAME);
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394 }
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395 }
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396
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397 /**
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398 * Receives notification from the attached instrument that execution is about to enter node
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399 * where the breakpoint is set. Designed so that when in the fast path, there is either an
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400 * unconditional "halt" call to the debugger or nothing.
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401 */
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402 private void nodeEnter(Node astNode, VirtualFrame vFrame) {
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403
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404 // Deopt if the global active/inactive flag has changed
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405 try {
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406 this.breakpointsActiveAssumption.check();
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407 } catch (InvalidAssumptionException ex) {
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408 this.breakpointsActiveAssumption = LineBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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409 }
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410
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411 // Deopt if the enabled/disabled state of this breakpoint has changed
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412 try {
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413 this.enabledUnchangedAssumption.check();
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414 } catch (InvalidAssumptionException ex) {
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415 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption("LineBreakpoint enabled state unchanged");
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416 }
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417
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418 if (LineBreakpointFactory.this.breakpointsActive && this.isEnabled) {
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419 if (isOneShot()) {
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420 dispose();
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421 }
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422 LineBreakpointImpl.this.doBreak(astNode, vFrame);
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423 }
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424 }
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425
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426 public void notifyResult(Node node, VirtualFrame vFrame, Object result) {
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427 final boolean condition = (Boolean) result;
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428 if (TRACE) {
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429 trace("breakpoint condition = %b %s", condition, getShortDescription());
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430 }
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431 if (condition) {
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432 nodeEnter(node, vFrame);
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433 }
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434 }
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435
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436 @TruffleBoundary
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437 public void notifyFailure(Node node, VirtualFrame vFrame, RuntimeException ex) {
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438 warningLog.addWarning(String.format("Exception in %s: %s", getShortDescription(), ex.getMessage()));
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439 if (TRACE) {
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440 trace("breakpoint failure = %s %s", ex.toString(), getShortDescription());
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441 }
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442 // Take the breakpoint if evaluation fails.
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443 nodeEnter(node, vFrame);
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444 }
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445
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446 @Override
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447 public String getLocationDescription() {
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448 return "Line: " + lineLocation.getShortDescription();
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449 }
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450
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451 @Override
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452 public LineLocation getLineLocation() {
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453 return lineLocation;
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454 }
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455
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456 private final class UnconditionalLineBreakInstrumentListener extends DefaultStandardInstrumentListener {
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457
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458 @Override
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
459 public void enter(Probe probe, Node node, VirtualFrame vFrame) {
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
460 LineBreakpointImpl.this.nodeEnter(node, vFrame);
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
461 }
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
462 }
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
463 }
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
464
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.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
465 }