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/*
* Copyright (c) 2012, 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.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.Map;
import java.util.WeakHashMap;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerOptions;
import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.FrameInstance;
import com.oracle.truffle.api.frame.FrameInstanceVisitor;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.DirectCallNode;
import com.oracle.truffle.api.nodes.IndirectCallNode;
import com.oracle.truffle.api.nodes.LoopNode;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RepeatingNode;
import com.oracle.truffle.api.nodes.RootNode;
/**
* Default implementation of the Truffle runtime if the virtual machine does not provide a better
* performing alternative.
*
* This is an implementation-specific class. Do not use or instantiate it. Instead, use
* {@link Truffle#getRuntime()} to retrieve the current {@link TruffleRuntime}.
*/
public final class DefaultTruffleRuntime implements TruffleRuntime {
private final ThreadLocal> stackTraces = new ThreadLocal<>();
private final Map callTargets = Collections.synchronizedMap(new WeakHashMap());
private final DefaultTVMCI tvmci = new DefaultTVMCI();
public DefaultTruffleRuntime() {
}
public DefaultTVMCI getTvmci() {
return tvmci;
}
@Override
public String getName() {
return "Default Truffle Runtime";
}
@Override
public RootCallTarget createCallTarget(RootNode rootNode) {
DefaultCallTarget target = new DefaultCallTarget(rootNode);
rootNode.setCallTarget(target);
callTargets.put(target, null);
return target;
}
@Override
public DirectCallNode createDirectCallNode(CallTarget target) {
return new DefaultDirectCallNode(target);
}
@Override
public IndirectCallNode createIndirectCallNode() {
return new DefaultIndirectCallNode();
}
@Override
public VirtualFrame createVirtualFrame(Object[] arguments, FrameDescriptor frameDescriptor) {
return new DefaultVirtualFrame(frameDescriptor, arguments);
}
@Override
public MaterializedFrame createMaterializedFrame(Object[] arguments) {
return createMaterializedFrame(arguments, new FrameDescriptor());
}
@Override
public MaterializedFrame createMaterializedFrame(Object[] arguments, FrameDescriptor frameDescriptor) {
return new DefaultMaterializedFrame(new DefaultVirtualFrame(frameDescriptor, arguments));
}
@Override
public CompilerOptions createCompilerOptions() {
return new DefaultCompilerOptions();
}
@Override
public Assumption createAssumption() {
return createAssumption(null);
}
@Override
public Assumption createAssumption(String name) {
return new DefaultAssumption(name);
}
@Override
public T iterateFrames(FrameInstanceVisitor visitor) {
T result = null;
for (FrameInstance frameInstance : getThreadLocalStackTrace()) {
result = visitor.visitFrame(frameInstance);
if (result != null) {
return result;
}
}
return result;
}
@Override
public FrameInstance getCallerFrame() {
LinkedList result = getThreadLocalStackTrace();
if (result.size() > 1) {
return result.get(1);
} else {
return null;
}
}
@Override
public Collection getCallTargets() {
return Collections.unmodifiableSet(callTargets.keySet());
}
@Override
public FrameInstance getCurrentFrame() {
return getThreadLocalStackTrace().peekFirst();
}
private LinkedList getThreadLocalStackTrace() {
LinkedList result = stackTraces.get();
if (result == null) {
result = new LinkedList<>();
stackTraces.set(result);
}
return result;
}
void pushFrame(VirtualFrame frame, CallTarget target) {
LinkedList threadLocalStackTrace = getThreadLocalStackTrace();
threadLocalStackTrace.addFirst(new DefaultFrameInstance(frame, target, null));
}
void pushFrame(VirtualFrame frame, CallTarget target, Node parentCallNode) {
LinkedList threadLocalStackTrace = getThreadLocalStackTrace();
// we need to ensure that frame instances are immutable so we need to recreate the parent
// frame
if (threadLocalStackTrace.size() > 0) {
DefaultFrameInstance oldInstance = (DefaultFrameInstance) threadLocalStackTrace.removeFirst();
threadLocalStackTrace.addFirst(new DefaultFrameInstance(oldInstance.getFrame(), oldInstance.getCallTarget(), parentCallNode));
}
threadLocalStackTrace.addFirst(new DefaultFrameInstance(frame, target, null));
}
void popFrame() {
LinkedList threadLocalStackTrace = getThreadLocalStackTrace();
threadLocalStackTrace.removeFirst();
if (threadLocalStackTrace.size() > 0) {
DefaultFrameInstance parent = (DefaultFrameInstance) threadLocalStackTrace.removeFirst();
threadLocalStackTrace.addFirst(new DefaultFrameInstance(parent.getFrame(), parent.getCallTarget(), null));
}
}
public T getCapability(Class capability) {
return null;
}
public void notifyTransferToInterpreter() {
}
public LoopNode createLoopNode(RepeatingNode repeating) {
if (!(repeating instanceof Node)) {
throw new IllegalArgumentException("Repeating node must be of type Node.");
}
return new DefaultLoopNode(repeating);
}
public boolean isProfilingEnabled() {
return false;
}
private static class DefaultFrameInstance implements FrameInstance {
private final CallTarget target;
private final VirtualFrame frame;
private final Node callNode;
DefaultFrameInstance(VirtualFrame frame, CallTarget target, Node callNode) {
this.target = target;
this.frame = frame;
this.callNode = callNode;
}
public final Frame getFrame(FrameAccess access, boolean slowPath) {
if (access == FrameAccess.NONE) {
return null;
}
if (access == FrameAccess.MATERIALIZE) {
return frame.materialize();
}
return frame;
}
final VirtualFrame getFrame() {
return frame;
}
public final boolean isVirtualFrame() {
return false;
}
public final CallTarget getCallTarget() {
return target;
}
public Node getCallNode() {
return callNode;
}
}
}