Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/subsystems/TraceManager.java @ 13514:0fbee3eb71f0
Ruby: import project.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Mon, 06 Jan 2014 17:12:09 +0000 |
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/* * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This * code is released under a tri EPL/GPL/LGPL license. You can use it, * redistribute it and/or modify it under the terms of the: * * Eclipse Public License version 1.0 * GNU General Public License version 2 * GNU Lesser General Public License version 2.1 */ package com.oracle.truffle.ruby.runtime.subsystems; import com.oracle.truffle.api.*; import com.oracle.truffle.api.utilities.*; import com.oracle.truffle.ruby.runtime.*; import com.oracle.truffle.ruby.runtime.core.*; /** * Manages trace events and calls the user's trace method if one is set. * <p> * Once tracing has been enabled via {@link #setTraceProc(RubyProc)}, the underlying instrumentation * remains in effect, along with performance impact. */ public final class TraceManager { private RubyContext context; private final AssumedValue<RubyProc> traceProc = new AssumedValue<>("trace-proc", null); private boolean suspended; private String lastFile; private int lastLine; private final Assumption notTracingAssumption = Truffle.getRuntime().createAssumption("tracing-disabled"); public TraceManager(RubyContext context) { this.context = context; } /** * Produce a trace; it is a runtime error if {@link #hasTraceProc()}{@code == false}. */ @CompilerDirectives.SlowPath public void trace(String event, String file, int line, long objectId, RubyBinding binding, String className) { // If tracing is suspended, stop here if (suspended) { return; } // If the file and line haven't changed since the last trace, stop here if (file.equals(lastFile) && line == lastLine) { return; } final RubyClass stringClass = context.getCoreLibrary().getStringClass(); // Suspend tracing while we run the trace proc suspended = true; try { // Exceptions from within the proc propagate normally traceProc.get().call(null, new RubyString(stringClass, event), // new RubyString(stringClass, file), // line, // GeneralConversions.fixnumOrBignum(objectId), // GeneralConversions.instanceOrNil(binding), // GeneralConversions.instanceOrNil(className)); } finally { // Resume tracing suspended = false; } // Remember the last trace event file and line lastFile = file; lastLine = line; } /** * Is there a "trace proc" in effect? */ public boolean hasTraceProc() { return traceProc.get() != null; } /** * Gets the assumption that there has never yet been tracing enabled. Once the assumption is * invalidated, tracing is presumed permanently enabled even if {@link #hasTraceProc()} returns * {@code false}. */ public Assumption getNotTracingAssumption() { return notTracingAssumption; } public void setTraceProc(RubyProc newTraceProc) { if (!context.getConfiguration().getTrace()) { throw new RuntimeException("You need the --trace option to use tracing"); } traceProc.set(newTraceProc); lastFile = null; lastLine = -1; notTracingAssumption.invalidate(); } }