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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2012, 2015, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.oracle.truffle.api.nodes;
import java.lang.reflect.Field;
import com.oracle.truffle.api.nodes.Node.Child;
import com.oracle.truffle.api.nodes.Node.Children;
import sun.misc.Unsafe;
/**
* Information about a field in a {@link Node} class.
*
* @since 0.8 or earlier
*/
@Deprecated
public abstract class NodeFieldAccessor {
/** @since 0.8 or earlier */
public enum NodeFieldKind {
/**
* The reference to the {@link NodeClass}.
*
* @since 0.8 or earlier
*/
NODE_CLASS,
/**
* The single {@link Node#getParent() parent} field.
*
* @since 0.8 or earlier
*/
PARENT,
/**
* A field annotated with {@link Child}.
*
* @since 0.8 or earlier
*/
CHILD,
/**
* A field annotated with {@link Children}.
*
* @since 0.8 or earlier
*/
CHILDREN,
/**
* A normal non-child data field of the node.
*
* @since 0.8 or earlier
*/
DATA
}
private static final boolean USE_UNSAFE = Boolean.getBoolean("truffle.unsafe");
private final NodeFieldKind kind;
private final Class declaringClass;
private final String name;
/** @since 0.8 or earlier */
protected final Class type;
/** @since 0.8 or earlier */
protected NodeFieldAccessor(NodeFieldKind kind, Class declaringClass, String name, Class type) {
this.kind = kind;
this.declaringClass = declaringClass;
this.name = name;
/** @since 0.8 or earlier */
this.type = type;
}
/** @since 0.8 or earlier */
protected static NodeFieldAccessor create(NodeFieldKind kind, Field field) {
if (USE_UNSAFE) {
return new UnsafeNodeField(kind, field);
} else {
return new ReflectionNodeField(kind, field);
}
}
/** @since 0.8 or earlier */
public NodeFieldKind getKind() {
return kind;
}
/** @since 0.8 or earlier */
public Class getType() {
return type;
}
/** @since 0.8 or earlier */
public Class getDeclaringClass() {
return declaringClass;
}
/** @since 0.8 or earlier */
public String getName() {
return name;
}
/**
* @deprecated The visibility of this method will be reduced to protected. Do not use.
* @since 0.8 or earlier
*/
@Deprecated
public abstract void putObject(Node receiver, Object value);
/**
* @deprecated The visibility of this method will be reduced to protected. Do not use.
* @since 0.8 or earlier
*/
@Deprecated
public abstract Object getObject(Node receiver);
/** @since 0.8 or earlier */
public abstract Object loadValue(Node node);
/** @since 0.14 */
@Override
public String toString() {
return getDeclaringClass().getName() + "." + getName();
}
/** @since 0.8 or earlier */
@SuppressWarnings("deprecation")
public abstract static class AbstractUnsafeNodeFieldAccessor extends NodeFieldAccessor {
/** @since 0.8 or earlier */
protected AbstractUnsafeNodeFieldAccessor(NodeFieldKind kind, Class declaringClass, String name, Class type) {
super(kind, declaringClass, name, type);
}
/** @since 0.8 or earlier */
public abstract long getOffset();
/** @since 0.8 or earlier */
@Override
public void putObject(Node receiver, Object value) {
if (!type.isPrimitive() && value == null || type.isInstance(value)) {
unsafe.putObject(receiver, getOffset(), value);
} else {
throw illegalArgumentException(value);
}
}
private IllegalArgumentException illegalArgumentException(Object value) {
return new IllegalArgumentException("Cannot set " + getType().getName() + " field " + toString() + " to " + (value == null ? "null" : value.getClass().getName()));
}
/** @since 0.8 or earlier */
@Override
public Object getObject(Node receiver) {
if (!type.isPrimitive()) {
return unsafe.getObject(receiver, getOffset());
} else {
throw new IllegalArgumentException();
}
}
/** @since 0.8 or earlier */
@Override
public Object loadValue(Node node) {
if (type == boolean.class) {
return unsafe.getBoolean(node, getOffset());
} else if (type == byte.class) {
return unsafe.getByte(node, getOffset());
} else if (type == short.class) {
return unsafe.getShort(node, getOffset());
} else if (type == char.class) {
return unsafe.getChar(node, getOffset());
} else if (type == int.class) {
return unsafe.getInt(node, getOffset());
} else if (type == long.class) {
return unsafe.getLong(node, getOffset());
} else if (type == float.class) {
return unsafe.getFloat(node, getOffset());
} else if (type == double.class) {
return unsafe.getDouble(node, getOffset());
} else {
return unsafe.getObject(node, getOffset());
}
}
private static final Unsafe unsafe = getUnsafe();
private static Unsafe getUnsafe() {
try {
return Unsafe.getUnsafe();
} catch (SecurityException e) {
}
try {
Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
theUnsafeInstance.setAccessible(true);
return (Unsafe) theUnsafeInstance.get(Unsafe.class);
} catch (Exception e) {
throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
}
}
}
@SuppressWarnings("deprecation")
private static final class UnsafeNodeField extends AbstractUnsafeNodeFieldAccessor {
private final long offset;
protected UnsafeNodeField(NodeFieldKind kind, Field field) {
super(kind, field.getDeclaringClass(), field.getName(), field.getType());
this.offset = AbstractUnsafeNodeFieldAccessor.unsafe.objectFieldOffset(field);
}
@Override
public long getOffset() {
return offset;
}
}
@SuppressWarnings("deprecation")
private static final class ReflectionNodeField extends NodeFieldAccessor {
private final Field field;
protected ReflectionNodeField(NodeFieldKind kind, Field field) {
super(kind, field.getDeclaringClass(), field.getName(), field.getType());
this.field = field;
field.setAccessible(true);
}
@Override
public void putObject(Node receiver, Object value) {
assert !type.isPrimitive() && value == null || type.isInstance(value);
try {
field.set(receiver, value);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
@Override
public Object getObject(Node receiver) {
assert !type.isPrimitive();
try {
return field.get(receiver);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
@Override
public Object loadValue(Node node) {
try {
if (type == boolean.class) {
return field.getBoolean(node);
} else if (type == byte.class) {
return field.getByte(node);
} else if (type == short.class) {
return field.getShort(node);
} else if (type == char.class) {
return field.getChar(node);
} else if (type == int.class) {
return field.getInt(node);
} else if (type == long.class) {
return field.getLong(node);
} else if (type == float.class) {
return field.getFloat(node);
} else if (type == double.class) {
return field.getDouble(node);
} else {
return field.get(node);
}
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
}
}
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