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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.runtime.subsystems;
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11
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12 import com.oracle.truffle.api.*;
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13 import com.oracle.truffle.api.utilities.*;
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14 import com.oracle.truffle.ruby.runtime.*;
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15 import com.oracle.truffle.ruby.runtime.core.*;
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16
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17 /**
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18 * Manages trace events and calls the user's trace method if one is set.
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19 * <p>
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20 * Once tracing has been enabled via {@link #setTraceProc(RubyProc)}, the underlying instrumentation
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21 * remains in effect, along with performance impact.
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22 */
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23 public final class TraceManager {
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24
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25 private RubyContext context;
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26
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27 private final AssumedValue<RubyProc> traceProc = new AssumedValue<>("trace-proc", null);
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28 private boolean suspended;
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29
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30 private String lastFile;
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31 private int lastLine;
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32
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33 private final Assumption notTracingAssumption = Truffle.getRuntime().createAssumption("tracing-disabled");
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34
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35 public TraceManager(RubyContext context) {
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36 this.context = context;
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37 }
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38
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39 /**
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40 * Produce a trace; it is a runtime error if {@link #hasTraceProc()}{@code == false}.
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41 */
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42 @CompilerDirectives.SlowPath
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43 public void trace(String event, String file, int line, long objectId, RubyBinding binding, String className) {
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44 // If tracing is suspended, stop here
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45
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46 if (suspended) {
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47 return;
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48 }
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49
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50 // If the file and line haven't changed since the last trace, stop here
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51
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52 if (file.equals(lastFile) && line == lastLine) {
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53 return;
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54 }
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55
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56 final RubyClass stringClass = context.getCoreLibrary().getStringClass();
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57
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58 // Suspend tracing while we run the trace proc
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59
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60 suspended = true;
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61
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62 try {
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63 // Exceptions from within the proc propagate normally
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64
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65 traceProc.get().call(null, new RubyString(stringClass, event), //
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66 new RubyString(stringClass, file), //
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67 line, //
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68 GeneralConversions.fixnumOrBignum(objectId), //
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69 GeneralConversions.instanceOrNil(binding), //
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70 GeneralConversions.instanceOrNil(className));
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71 } finally {
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72 // Resume tracing
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73
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74 suspended = false;
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75 }
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76
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77 // Remember the last trace event file and line
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78
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79 lastFile = file;
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80 lastLine = line;
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81 }
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82
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83 /**
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84 * Is there a "trace proc" in effect?
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85 */
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86 public boolean hasTraceProc() {
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87 return traceProc.get() != null;
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88 }
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89
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90 /**
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91 * Gets the assumption that there has never yet been tracing enabled. Once the assumption is
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92 * invalidated, tracing is presumed permanently enabled even if {@link #hasTraceProc()} returns
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93 * {@code false}.
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94 */
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95 public Assumption getNotTracingAssumption() {
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96 return notTracingAssumption;
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97 }
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98
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99 public void setTraceProc(RubyProc newTraceProc) {
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100 if (!context.getConfiguration().getTrace()) {
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101 throw new RuntimeException("You need the --trace option to use tracing");
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102 }
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103
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104 traceProc.set(newTraceProc);
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105 lastFile = null;
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106 lastLine = -1;
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107
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108 notTracingAssumption.invalidate();
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109 }
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110 }
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