annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/TagBreakpointFactory.java @ 22225:a0fa69e3e60e

Truffle/Instrumentation: remove static Instrument factory methods, now supported by Instrumenter
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sat, 19 Sep 2015 16:29:32 -0700
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children 3f2052afcb6d
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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.DISABLED;
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28 import static com.oracle.truffle.api.debug.Breakpoint.State.DISPOSED;
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29 import static com.oracle.truffle.api.debug.Breakpoint.State.ENABLED;
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30
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31 import java.io.IOException;
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32 import java.io.PrintStream;
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33 import java.util.ArrayList;
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34 import java.util.Collections;
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35 import java.util.Comparator;
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36 import java.util.HashMap;
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37 import java.util.List;
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38 import java.util.Map;
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39 import java.util.Map.Entry;
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40
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41 import com.oracle.truffle.api.Assumption;
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42 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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43 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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44 import com.oracle.truffle.api.Truffle;
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45 import com.oracle.truffle.api.debug.Debugger.BreakpointCallback;
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46 import com.oracle.truffle.api.debug.Debugger.WarningLog;
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47 import com.oracle.truffle.api.frame.VirtualFrame;
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48 import com.oracle.truffle.api.instrument.AdvancedInstrumentResultListener;
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49 import com.oracle.truffle.api.instrument.Instrument;
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50 import com.oracle.truffle.api.instrument.Instrumenter;
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51 import com.oracle.truffle.api.instrument.Probe;
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52 import com.oracle.truffle.api.instrument.SyntaxTag;
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53 import com.oracle.truffle.api.instrument.SyntaxTagTrap;
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54 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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55 import com.oracle.truffle.api.instrument.impl.DefaultStandardInstrumentListener;
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56 import com.oracle.truffle.api.nodes.InvalidAssumptionException;
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57 import com.oracle.truffle.api.nodes.Node;
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58 import com.oracle.truffle.api.utilities.CyclicAssumption;
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59
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60 // TODO (mlvdv) some common functionality could be factored out of this and LineBreakpointSupport
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61
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62 /**
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63 * Support class for creating and managing "Tag Breakpoints". A Tag Breakpoint halts execution just
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64 * before reaching any node whose Probe carries a specified {@linkplain SyntaxTag Tag}.
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65 * <p>
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66 * The {@linkplain Instrumenter#setBeforeTagTrap(SyntaxTagTrap) Tag Trap}, which is built directly
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67 * into the Instrumentation Framework, does the same thing more efficiently, but there may only be
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68 * one Tag Trap active at a time. Any number of tag breakpoints may coexist with the Tag Trap, but
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69 * it would be confusing to have a Tag Breakpoint set for the same Tag as the current Tag Trap.
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70 * <p>
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71 * Notes:
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72 * <ol>
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73 * <li>Only one Tag Breakpoint can be active for a specific {@linkplain SyntaxTag Tag}.</li>
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74 * <li>A newly created breakpoint looks for probes matching the tag, attaches to them if found by
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75 * installing an {@link Instrument}.</li>
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76 * <li>When Truffle "splits" or otherwise copies an AST, any attached {@link Instrument} will be
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77 * copied along with the rest of the AST and will call back to the same breakpoint.</li>
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78 * <li>When notification is received that the breakpoint's Tag has been newly added to a Node, then
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79 * the breakpoint will attach a new Instrument at the probe to activate the breakpoint at that
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80 * location.</li>
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81 * <li>A breakpoint may have multiple Instruments deployed, one attached to each Probe that holds
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82 * the breakpoint's tag; this might happen when a source is reloaded.</li>
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83 * </ol>
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84 */
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85 final class TagBreakpointFactory {
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86
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87 private static final boolean TRACE = false;
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88 private static final PrintStream OUT = System.out;
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89
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90 private static final String BREAKPOINT_NAME = "TAG BREAKPOINT";
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91
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92 @TruffleBoundary
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93 private static void trace(String format, Object... args) {
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94 if (TRACE) {
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95 OUT.println(String.format("%s: %s", BREAKPOINT_NAME, String.format(format, args)));
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96 }
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97 }
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98
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99 private static final Comparator<Entry<SyntaxTag, TagBreakpointImpl>> BREAKPOINT_COMPARATOR = new Comparator<Entry<SyntaxTag, TagBreakpointImpl>>() {
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100
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101 @Override
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102 public int compare(Entry<SyntaxTag, TagBreakpointImpl> entry1, Entry<SyntaxTag, TagBreakpointImpl> entry2) {
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103 return entry1.getKey().name().compareTo(entry2.getKey().name());
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104 }
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105 };
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106
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107 private final Debugger debugger;
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108 private final BreakpointCallback breakpointCallback;
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109 private final WarningLog warningLog;
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110
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111 /**
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112 * Map: Tags ==> Tag Breakpoints. There may be no more than one breakpoint per Tag.
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113 */
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114 private final Map<SyntaxTag, TagBreakpointImpl> tagToBreakpoint = new HashMap<>();
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115
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116 /**
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117 * Globally suspends all line breakpoint activity when {@code false}, ignoring whether
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118 * individual breakpoints are enabled.
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119 */
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120 @CompilationFinal private boolean breakpointsActive = true;
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121 private final CyclicAssumption breakpointsActiveUnchanged = new CyclicAssumption(BREAKPOINT_NAME + " globally active");
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122
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123 TagBreakpointFactory(Debugger debugger, BreakpointCallback breakpointCallback, final WarningLog warningLog) {
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124 this.debugger = debugger;
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125 this.breakpointCallback = breakpointCallback;
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126 this.warningLog = warningLog;
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127
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128 debugger.getInstrumenter().addProbeListener(new DefaultProbeListener() {
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129
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130 @Override
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131 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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132 final TagBreakpointImpl breakpoint = tagToBreakpoint.get(tag);
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133 if (breakpoint != null) {
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134 try {
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135 breakpoint.attach(probe);
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136 } catch (IOException e) {
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137 warningLog.addWarning(BREAKPOINT_NAME + " failure attaching to newly tagged Probe: " + e.getMessage());
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138 if (TRACE) {
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139 OUT.println(BREAKPOINT_NAME + " failure: " + e.getMessage());
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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 });
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145 }
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146
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147 /**
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148 * Globally enables tag breakpoint activity; all breakpoints are ignored when set to
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149 * {@code false}. When set to {@code true}, the enabled/disabled status of each breakpoint
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150 * determines whether it will trigger when flow of execution reaches it.
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151 *
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152 * @param breakpointsActive
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153 */
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154 void setActive(boolean breakpointsActive) {
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155 if (this.breakpointsActive != breakpointsActive) {
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156 breakpointsActiveUnchanged.invalidate();
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157 this.breakpointsActive = breakpointsActive;
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158 }
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159 }
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160
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161 /**
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162 * Gets all current tag breakpoints,regardless of status; sorted and modification safe.
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163 */
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164 List<TagBreakpoint> getAll() {
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165 ArrayList<Entry<SyntaxTag, TagBreakpointImpl>> entries = new ArrayList<>(tagToBreakpoint.entrySet());
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166 Collections.sort(entries, BREAKPOINT_COMPARATOR);
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167
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168 final ArrayList<TagBreakpoint> breakpoints = new ArrayList<>(entries.size());
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169 for (Entry<SyntaxTag, TagBreakpointImpl> entry : entries) {
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170 breakpoints.add(entry.getValue());
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171 }
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172 return breakpoints;
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173 }
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174
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175 /**
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176 * Creates a new tag breakpoint if one doesn't already exist. If one does exist, then resets the
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177 * <em>ignore count</em>.
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178 *
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179 * @param tag where to set the breakpoint
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180 * @param ignoreCount number of initial hits before the breakpoint starts causing breaks.
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181 * @param oneShot whether the breakpoint should dispose itself after one hit
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182 * @return a possibly new breakpoint
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183 * @throws IOException if a breakpoint already exists for the tag and the ignore count is the
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184 * same
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185 */
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186 TagBreakpoint create(int ignoreCount, SyntaxTag tag, boolean oneShot) throws IOException {
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187
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188 TagBreakpointImpl breakpoint = tagToBreakpoint.get(tag);
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189
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190 if (breakpoint == null) {
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191 breakpoint = new TagBreakpointImpl(ignoreCount, tag, oneShot);
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192
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193 if (TRACE) {
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194 trace("NEW " + breakpoint.getShortDescription());
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195 }
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196
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197 tagToBreakpoint.put(tag, breakpoint);
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198
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199 for (Probe probe : debugger.getInstrumenter().findProbesTaggedAs(tag)) {
22003
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200 breakpoint.attach(probe);
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201 }
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202 } else {
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203 if (ignoreCount == breakpoint.getIgnoreCount()) {
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204 throw new IOException(BREAKPOINT_NAME + " already set for tag " + tag.name());
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205 }
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206 breakpoint.setIgnoreCount(ignoreCount);
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207 if (TRACE) {
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208 trace("CHANGED ignoreCount %s", breakpoint.getShortDescription());
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209 }
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210 }
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211 return breakpoint;
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212 }
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213
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214 /**
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215 * Returns the {@link TagBreakpoint} for a given tag, {@code null} if none.
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216 */
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217 TagBreakpoint get(SyntaxTag tag) {
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218 return tagToBreakpoint.get(tag);
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219 }
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220
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221 /**
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222 * Removes the associated instrumentation for all one-shot breakpoints only.
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223 */
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224 void disposeOneShots() {
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225 List<TagBreakpointImpl> breakpoints = new ArrayList<>(tagToBreakpoint.values());
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226 for (TagBreakpointImpl breakpoint : breakpoints) {
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227 if (breakpoint.isOneShot()) {
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228 breakpoint.dispose();
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229 }
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230 }
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231 }
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232
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233 /**
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234 * Removes all knowledge of a breakpoint, presumed disposed.
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235 */
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236 private void forget(TagBreakpointImpl breakpoint) {
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237 tagToBreakpoint.remove(breakpoint.getTag());
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238 }
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239
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240 /**
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241 * Concrete representation of a line breakpoint, implemented by attaching an instrument to a
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242 * probe at the designated source location.
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243 */
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244 private final class TagBreakpointImpl extends TagBreakpoint implements AdvancedInstrumentResultListener {
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245
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246 private static final String SHOULD_NOT_HAPPEN = "TagBreakpointImpl: should not happen";
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247
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248 private final SyntaxTag tag;
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249
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250 // Cached assumption that the global status of tag breakpoint activity has not changed.
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251 private Assumption breakpointsActiveAssumption;
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252
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253 // Whether this breakpoint is enable/disabled
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254 @CompilationFinal private boolean isEnabled;
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255 private Assumption enabledUnchangedAssumption;
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256
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257 private String conditionExpr;
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258
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259 /**
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260 * The instrument(s) that this breakpoint currently has attached to a {@link Probe}:
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261 * {@code null} if not attached.
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262 */
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263 private List<Instrument> instruments = new ArrayList<>();
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264
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265 private TagBreakpointImpl(int ignoreCount, SyntaxTag tag, boolean oneShot) {
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266 super(ENABLED, ignoreCount, oneShot);
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267 this.tag = tag;
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268 this.breakpointsActiveAssumption = TagBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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269 this.isEnabled = true;
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270 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption(BREAKPOINT_NAME + " enabled state unchanged");
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271 }
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272
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273 @Override
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274 public boolean isEnabled() {
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275 return isEnabled;
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276 }
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277
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278 @Override
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279 public void setEnabled(boolean enabled) {
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280 // Tag Breakpoints are never unresolved
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281 if (enabled != isEnabled) {
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282 switch (getState()) {
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283 case ENABLED:
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284 assert !enabled : SHOULD_NOT_HAPPEN;
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285 doSetEnabled(false);
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286 changeState(DISABLED);
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287 break;
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288 case DISABLED:
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289 assert enabled : SHOULD_NOT_HAPPEN;
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290 doSetEnabled(true);
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291 changeState(ENABLED);
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292 break;
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293 case DISPOSED:
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294 assert false : "breakpoint disposed";
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295 break;
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296 case ENABLED_UNRESOLVED:
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297 case DISABLED_UNRESOLVED:
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298 default:
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299 assert false : SHOULD_NOT_HAPPEN;
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300 break;
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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 void setCondition(String expr) throws IOException {
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307 if (this.conditionExpr != null || expr != null) {
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308 // De-instrument the Probes instrumented by this breakpoint
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309 final ArrayList<Probe> probes = new ArrayList<>();
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310 for (Instrument instrument : instruments) {
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311 probes.add(instrument.getProbe());
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312 instrument.dispose();
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313 }
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314 instruments.clear();
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315 this.conditionExpr = expr;
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316 // Re-instrument the probes previously instrumented
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317 for (Probe probe : probes) {
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318 attach(probe);
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319 }
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320 }
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321 }
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322
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323 @Override
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324 public String getCondition() {
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325 return conditionExpr;
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326 }
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327
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95d5d6a93968 add more truffle boundaries
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328 @TruffleBoundary
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329 @Override
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330 public void dispose() {
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331 if (getState() != DISPOSED) {
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332 for (Instrument instrument : instruments) {
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333 instrument.dispose();
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334 }
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335 changeState(DISPOSED);
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336 TagBreakpointFactory.this.forget(this);
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337 }
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338 }
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339
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340 private void attach(Probe newProbe) throws IOException {
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341 if (getState() == DISPOSED) {
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342 throw new IllegalStateException("Attempt to attach a disposed " + BREAKPOINT_NAME);
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343 }
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344 Instrument newInstrument = null;
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a0fa69e3e60e Truffle/Instrumentation: remove static Instrument factory methods, now supported by Instrumenter
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345 final Instrumenter instrumenter = debugger.getInstrumenter();
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346 if (conditionExpr == null) {
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347 newInstrument = instrumenter.attach(newProbe, new UnconditionalTagBreakInstrumentListener(), BREAKPOINT_NAME);
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348 } else {
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349 instrumenter.attach(newProbe, this, debugger.createAdvancedInstrumentRootFactory(newProbe, conditionExpr, this), Boolean.class, BREAKPOINT_NAME);
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350 }
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351 instruments.add(newInstrument);
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352 changeState(isEnabled ? ENABLED : DISABLED);
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353 }
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354
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355 private void doSetEnabled(boolean enabled) {
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356 if (this.isEnabled != enabled) {
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357 enabledUnchangedAssumption.invalidate();
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358 this.isEnabled = enabled;
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359 }
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360 }
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diff changeset
361
22011
95d5d6a93968 add more truffle boundaries
Andreas Woess <andreas.woess@oracle.com>
parents: 22003
diff changeset
362 @TruffleBoundary
22003
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363 private String getShortDescription() {
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364 return BREAKPOINT_NAME + "@" + tag.name();
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365 }
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diff changeset
366
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367 private void changeState(State after) {
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368 if (TRACE) {
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369 trace("STATE %s-->%s %s", getState().getName(), after.getName(), getShortDescription());
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370 }
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diff changeset
371 setState(after);
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372 }
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diff changeset
373
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374 private void doBreak(Node node, VirtualFrame vFrame) {
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diff changeset
375 if (incrHitCountCheckIgnore()) {
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diff changeset
376 breakpointCallback.haltedAt(node, vFrame.materialize(), BREAKPOINT_NAME);
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377 }
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378 }
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379
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diff changeset
380 /**
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381 * Receives notification from the attached instrument that execution is about to enter node
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382 * where the breakpoint is set. Designed so that when in the fast path, there is either an
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383 * unconditional "halt" call to the debugger or nothing.
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diff changeset
384 */
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diff changeset
385 private void nodeEnter(Node astNode, VirtualFrame vFrame) {
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diff changeset
386
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387 // Deopt if the global active/inactive flag has changed
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diff changeset
388 try {
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diff changeset
389 this.breakpointsActiveAssumption.check();
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diff changeset
390 } catch (InvalidAssumptionException ex) {
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diff changeset
391 this.breakpointsActiveAssumption = TagBreakpointFactory.this.breakpointsActiveUnchanged.getAssumption();
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392 }
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parents:
diff changeset
393
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diff changeset
394 // Deopt if the enabled/disabled state of this breakpoint has changed
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diff changeset
395 try {
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diff changeset
396 this.enabledUnchangedAssumption.check();
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397 } catch (InvalidAssumptionException ex) {
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398 this.enabledUnchangedAssumption = Truffle.getRuntime().createAssumption("LineBreakpoint enabled state unchanged");
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399 }
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400
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401 if (TagBreakpointFactory.this.breakpointsActive && this.isEnabled) {
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402 if (isOneShot()) {
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403 dispose();
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404 }
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405 TagBreakpointImpl.this.doBreak(astNode, vFrame);
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406 }
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407
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408 }
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409
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410 public void notifyResult(Node node, VirtualFrame vFrame, Object result) {
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411 final boolean condition = (Boolean) result;
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412 if (TRACE) {
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413 trace("breakpoint condition = %b %s", condition, getShortDescription());
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414 }
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415 if (condition) {
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416 nodeEnter(node, vFrame);
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417 }
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418 }
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419
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420 public void notifyFailure(Node node, VirtualFrame vFrame, RuntimeException ex) {
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421 addExceptionWarning(ex);
22003
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422 if (TRACE) {
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423 trace("breakpoint failure = %s %s", ex, getShortDescription());
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424 }
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425 // Take the breakpoint if evaluation fails.
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426 nodeEnter(node, vFrame);
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427 }
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428
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429 @TruffleBoundary
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430 private void addExceptionWarning(RuntimeException ex) {
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431 warningLog.addWarning(String.format("Exception in %s: %s", getShortDescription(), ex.getMessage()));
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432 }
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433
22003
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434 @Override
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435 public String getLocationDescription() {
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436 return "Tag " + tag.name();
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437 }
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438
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439 @Override
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440 public SyntaxTag getTag() {
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441 return tag;
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442 }
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443
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444 private final class UnconditionalTagBreakInstrumentListener extends DefaultStandardInstrumentListener {
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445
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446 @Override
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447 public void enter(Probe probe, Node node, VirtualFrame vFrame) {
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448 TagBreakpointImpl.this.nodeEnter(node, vFrame);
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449 }
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450 }
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451
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452 }
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453
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454 }