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*
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package com.oracle.truffle.api.impl;
import java.io.Closeable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.Objects;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives;
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 DefaultTVMCI tvmci = new DefaultTVMCI();
private final TVMCI.Test testTvmci = new TVMCI.Test() {
@Override
protected Closeable createTestContext(String testName) {
return null;
}
@Override
public CallTarget createTestCallTarget(Closeable testContext, RootNode testNode) {
return createCallTarget(testNode);
}
@Override
public void finishWarmup(Closeable testContext, CallTarget callTarget) {
// do nothing if we have no compiler
}
};
public DefaultTruffleRuntime() {
}
/**
* Utility method that casts the singleton {@link TruffleRuntime}.
*/
static DefaultTruffleRuntime getRuntime() {
return (DefaultTruffleRuntime) Truffle.getRuntime();
}
public DefaultTVMCI getTvmci() {
return tvmci;
}
@Override
public String getName() {
return "Interpreted";
}
@SuppressWarnings("deprecation")
@Override
public RootCallTarget createCallTarget(RootNode rootNode) {
DefaultCallTarget target = new DefaultCallTarget(rootNode);
DefaultRuntimeAccessor.INSTRUMENT.onLoad(target.getRootNode());
return target;
}
@Override
public DirectCallNode createDirectCallNode(CallTarget target) {
Objects.requireNonNull(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;
DefaultFrameInstance frameInstance = getThreadLocalStackTrace();
while (frameInstance != null) {
result = visitor.visitFrame(frameInstance);
if (result != null) {
return result;
}
frameInstance = frameInstance.callerFrame;
}
return result;
}
@Override
public FrameInstance getCallerFrame() {
DefaultFrameInstance currentFrame = getThreadLocalStackTrace();
if (currentFrame != null) {
return currentFrame.callerFrame;
} else {
return null;
}
}
@Override
public FrameInstance getCurrentFrame() {
return getThreadLocalStackTrace();
}
private DefaultFrameInstance getThreadLocalStackTrace() {
return stackTraces.get();
}
private void setThreadLocalStackTrace(DefaultFrameInstance topFrame) {
stackTraces.set(topFrame);
}
DefaultFrameInstance pushFrame(VirtualFrame frame, CallTarget target) {
DefaultFrameInstance callerFrame = getThreadLocalStackTrace();
setThreadLocalStackTrace(new DefaultFrameInstance(frame, target, null, callerFrame));
return callerFrame;
}
DefaultFrameInstance pushFrame(VirtualFrame frame, CallTarget target, Node parentCallNode) {
DefaultFrameInstance callerFrame = getThreadLocalStackTrace();
// we need to ensure that frame instances are immutable so we need to recreate the parent
// frame
DefaultFrameInstance callerFrameWithCallNode = callerFrame != null ? callerFrame.withCallNode(parentCallNode) : callerFrame;
setThreadLocalStackTrace(new DefaultFrameInstance(frame, target, null, callerFrameWithCallNode));
return callerFrame;
}
void popFrame(DefaultFrameInstance callerFrame) {
setThreadLocalStackTrace(callerFrame);
}
@Override
public T getCapability(Class capability) {
if (capability == TVMCI.Test.class) {
return capability.cast(testTvmci);
} else if (capability == TVMCI.class) {
return capability.cast(tvmci);
}
final Iterator it = Loader.load(capability).iterator();
try {
return it.hasNext() ? it.next() : null;
} catch (ServiceConfigurationError e) {
return null;
}
}
private static final class Loader {
private static final Method LOAD_METHOD;
static {
Method loadMethod = null;
try {
Class servicesClass = Class.forName("jdk.vm.ci.services.Services");
loadMethod = servicesClass.getMethod("load", Class.class);
} catch (ClassNotFoundException | NoSuchMethodException e) {
// Services.load is not available
}
if (loadMethod != null) {
try {
try {
loadMethod.invoke(null, (Object) null);
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
} catch (NullPointerException npe) {
// Services.load is accessible
} catch (IllegalAccessException iae) {
// Services.load is not accessible. This happens on JDK 9+ when EnableJVMCI is
// true (either explicitly or by default) which causes the jdk.internal.vm.ci
// module to be resolved.
loadMethod = null;
} catch (Throwable e) {
throw new InternalError(e);
}
}
LOAD_METHOD = loadMethod;
}
@SuppressWarnings("unchecked")
static Iterable load(Class service) {
TruffleJDKServices.addUses(service);
if (LOAD_METHOD != null) {
try {
return (Iterable) LOAD_METHOD.invoke(null, service);
} catch (Exception e) {
throw new InternalError(e);
}
} else {
return ServiceLoader.load(service);
}
}
}
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;
}
static final class DefaultFrameInstance implements FrameInstance {
private final CallTarget target;
private final VirtualFrame frame;
private final Node callNode;
private final DefaultFrameInstance callerFrame;
DefaultFrameInstance(VirtualFrame frame, CallTarget target, Node callNode, DefaultFrameInstance callerFrame) {
this.target = target;
this.frame = frame;
this.callNode = callNode;
this.callerFrame = callerFrame;
}
public Frame getFrame(FrameAccess access) {
Frame localFrame = this.frame;
switch (access) {
case READ_ONLY:
/* Verify that it is really used read only. */
return new ReadOnlyFrame(localFrame);
case READ_WRITE:
return localFrame;
case MATERIALIZE:
return localFrame.materialize();
default:
throw CompilerDirectives.shouldNotReachHere();
}
}
public boolean isVirtualFrame() {
return false;
}
public CallTarget getCallTarget() {
return target;
}
public Node getCallNode() {
return callNode;
}
DefaultFrameInstance withCallNode(Node otherCallNode) {
return new DefaultFrameInstance(frame, target, otherCallNode, callerFrame);
}
}
}