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/*
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.oracle.truffle.api.debug;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.debug.impl.DebuggerInstrument;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.impl.Accessor;
import com.oracle.truffle.api.instrumentation.EventBinding;
import com.oracle.truffle.api.instrumentation.Instrumenter;
import com.oracle.truffle.api.instrumentation.LoadSourceEvent;
import com.oracle.truffle.api.instrumentation.LoadSourceListener;
import com.oracle.truffle.api.instrumentation.SourceSectionFilter;
import com.oracle.truffle.api.instrumentation.TruffleInstrument.Env;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;
/**
* Represents debugging related state of a {@link PolyglotEngine}.
*
* Access to the (singleton) instance in an engine, is available via:
*
*
{@link Debugger#find(PolyglotEngine)}
*
{@link Debugger#find(TruffleLanguage.Env)}
*
{@link DebuggerSession#getDebugger()}
*
*
* To start new debugger session use {@link #startSession(SuspendedCallback)}. Please see
* {@link DebuggerSession} for a usage example.
*
* The debugger supports diagnostic tracing that can be enabled using the
* -Dtruffle.debug.trace=true Java property. The output of this tracing is not
* guaranteed and will change without notice.
*
* @see Debugger#startSession(SuspendedCallback)
* @see DebuggerSession
* @see Breakpoint
*
* @since 0.9
*/
public final class Debugger {
static final boolean TRACE = Boolean.getBoolean("truffle.debug.trace");
/*
* The engine with this debugger was created.
*/
private final PolyglotEngine sourceVM;
private final Env env;
private final ObjectStructures.MessageNodes msgNodes;
Debugger(PolyglotEngine sourceVM, Env env) {
this.env = env;
this.sourceVM = sourceVM;
this.msgNodes = new ObjectStructures.MessageNodes();
}
/**
* Starts a new {@link DebuggerSession session} provided with a callback that gets notified
* whenever the execution is suspended.
*
* @param callback the callback to notify
* @see DebuggerSession
* @see SuspendedEvent
* @since 0.17
*/
public DebuggerSession startSession(SuspendedCallback callback) {
return new DebuggerSession(this, callback);
}
/**
* Returns a list of all loaded sources. The sources are returned in the order as they have been
* loaded by the languages.
*
* @return an unmodifiable list of sources
* @since 0.17
*/
public List getLoadedSources() {
final List sources = new ArrayList<>();
EventBinding binding = env.getInstrumenter().attachLoadSourceListener(SourceSectionFilter.ANY, new LoadSourceListener() {
public void onLoad(LoadSourceEvent event) {
sources.add(event.getSource());
}
}, true);
binding.dispose();
return Collections.unmodifiableList(sources);
}
PolyglotEngine getSourceVM() {
return sourceVM;
}
Env getEnv() {
return env;
}
Instrumenter getInstrumenter() {
return env.getInstrumenter();
}
ObjectStructures.MessageNodes getMessageNodes() {
return msgNodes;
}
static void trace(String message, Object... parameters) {
if (TRACE) {
PrintStream out = System.out;
out.println("Debugger: " + String.format(message, parameters));
}
}
/**
* Finds debugger associated with given engine. There is at most one debugger associated with
* any {@link PolyglotEngine}.
*
* @param engine the engine to find debugger for
* @return an instance of associated debugger, never null
* @since 0.9
*/
public static Debugger find(PolyglotEngine engine) {
return DebuggerInstrument.getDebugger(engine, new DebuggerInstrument.DebuggerFactory() {
public Debugger create(PolyglotEngine e, Env env) {
return new Debugger(e, env);
}
});
}
/**
* Finds the debugger associated with a given language environment. There is at most one
* debugger associated with any {@link PolyglotEngine}. Please note that a debugger instance
* looked up with a language also has access to all other languages and sources that were loaded
* by them.
*
* @param env the language environment to find debugger for
* @return an instance of associated debugger, never null
* @since 0.17
*/
public static Debugger find(TruffleLanguage.Env env) {
return find((PolyglotEngine) ACCESSOR.findVM(env));
}
static final class AccessorDebug extends Accessor {
@Override
protected Nodes nodes() {
return super.nodes();
}
/*
* TODO get rid of this access and replace it with an API in {@link TruffleInstrument.Env}.
* I don't think {@link CallTarget} is the right return type here as we want to make it
* embeddable into the current AST.
*/
protected CallTarget parse(Source code, Node context, String... argumentNames) {
RootNode rootNode = context.getRootNode();
return languageSupport().parse(engineSupport().getEnvForInstrument(rootNode.getLanguageInfo()), code, context, argumentNames);
}
/*
* TODO we should have a better way to publish services from instruments to languages.
*/
protected Object findVM(com.oracle.truffle.api.TruffleLanguage.Env env) {
return nodes().getEngineObject(languageSupport().getLanguageInfo(env));
}
/*
* TODO I initially moved this to TruffleInstrument.Env but decided against as a new API for
* inline parsing might replace it.
*/
protected Object evalInContext(Object sourceVM, Node node, MaterializedFrame frame, String code) {
return languageSupport().evalInContext(sourceVM, code, node, frame);
}
}
static final AccessorDebug ACCESSOR = new AccessorDebug();
}
