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Fat Jar containing pkl-cli, pkl-codegen-java, pkl-codegen-kotlin, pkl-config-java, pkl-core, pkl-doc, and their shaded third-party dependencies.
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* The Universal Permissive License (UPL), Version 1.0
*
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* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
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* (a) the Software, and
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package org.pkl.thirdparty.truffle.api.object;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;
import org.pkl.thirdparty.truffle.api.CompilerDirectives;
import org.pkl.thirdparty.truffle.api.CompilerDirectives.TruffleBoundary;
import org.pkl.thirdparty.truffle.api.dsl.NeverDefault;
import org.pkl.thirdparty.truffle.api.interop.TruffleObject;
import sun.misc.Unsafe;
/**
* Represents a dynamic object, members of which can be dynamically added and removed at run time.
*
* To use it, extend {@link DynamicObject} and use {@link DynamicObjectLibrary} for object accesses.
*
* When {@linkplain DynamicObject#DynamicObject(Shape) constructing} a {@link DynamicObject}, it has
* to be initialized with an empty initial shape. Initial shapes are created using
* {@link Shape#newBuilder()} and should ideally be shared per TruffleLanguage instance to allow
* shape caches to be shared across contexts.
*
* Subclasses can provide in-object dynamic field slots using the {@link DynamicField} annotation
* and {@link Shape.Builder#layout(Class) Shape.Builder.layout}.
*
*
* Example:
*
*
*
* public class MyObject extends DynamicObject implements TruffleObject {
* public MyObject(Shape shape) {
* super(shape);
* }
* }
*
* Shape initialShape = Shape.newBuilder().layout(MyObject.class).build();
*
* MyObject obj = new MyObject(initialShape);
*
*
*
* @see DynamicObject#DynamicObject(Shape)
* @see DynamicObjectLibrary
* @see Shape
* @see Shape#newBuilder()
* @since 0.8 or earlier
*/
public abstract class DynamicObject implements TruffleObject {
/**
* Using this annotation, subclasses can define additional dynamic fields to be used by the
* object layout. Annotated field must be of type {@code Object} or {@code long}, must not be
* final, and must not have any direct usages.
*
* @see Shape.Builder#layout(Class)
* @since 20.2.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
protected @interface DynamicField {
}
/** The current shape of the object. */
private Shape shape;
/** Object extension array. */
@DynamicField private Object[] extRef;
/** Primitive extension array. */
@DynamicField private int[] extVal;
/**
* Constructor for {@link DynamicObject} subclasses. Initializes the object with the provided
* shape. The shape must have been constructed with a {@linkplain Shape.Builder#layout(Class)
* layout class} assignable from this class (i.e., the concrete subclass, a superclass thereof,
* including {@link DynamicObject}) and must not have any instance properties (but may have
* constant properties).
*
*
* Examples:
*
*
* Shape shape = {@link Shape#newBuilder()}.{@link Shape.Builder#build() build}();
* DynamicObject myObject = new MyObject(shape);
*
*
*
* Shape shape = {@link Shape#newBuilder()}.{@link Shape.Builder#layout(Class) layout}(MyObject.class).{@link Shape.Builder#build() build}();
* DynamicObject myObject = new MyObject(shape);
*
*
* @param shape the initial shape of this object
* @throws IllegalArgumentException if called with an illegal (incompatible) shape
* @since 19.0
*/
protected DynamicObject(Shape shape) {
verifyShape(shape, this.getClass());
this.shape = shape;
}
private static void verifyShape(Shape shape, Class subclass) {
Class shapeType = shape.getLayoutClass();
if (!(shapeType == subclass || (shapeType.isAssignableFrom(subclass) && DynamicObject.class.isAssignableFrom(shapeType)))) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw illegalShapeType(shapeType, subclass);
}
if (shape.hasInstanceProperties()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw illegalShapeProperties();
}
}
@TruffleBoundary(transferToInterpreterOnException = false)
private static IllegalArgumentException illegalShapeType(Class shapeClass, Class thisClass) {
throw new IllegalArgumentException(String.format("Incompatible shape: layout class (%s) not assignable from this class (%s)", shapeClass.getName(), thisClass.getName()));
}
@TruffleBoundary(transferToInterpreterOnException = false)
private static IllegalArgumentException illegalShapeProperties() {
throw new IllegalArgumentException("Shape must not have instance properties");
}
/**
* Get the object's current shape.
*
* @since 0.8 or earlier
* @see Shape
*/
@NeverDefault
public final Shape getShape() {
return getShapeHelper(shape);
}
/**
* @implNote This method may be intrinsified by the Truffle compiler.
*/
private static Shape getShapeHelper(Shape shape) {
return shape;
}
/**
* Set the object's shape.
*/
final void setShape(Shape shape) {
assert assertSetShape(shape);
setShapeHelper(shape, SHAPE_OFFSET);
}
private boolean assertSetShape(Shape s) {
Class layoutType = s.getLayoutClass();
assert layoutType.isInstance(this) : illegalShapeType(layoutType, this.getClass());
return true;
}
/**
* @implNote This method may be intrinsified by the Truffle compiler.
*
* @param shapeOffset Shape field offset
*/
private void setShapeHelper(Shape shape, long shapeOffset) {
this.shape = shape;
}
/**
* The {@link #clone()} method is not supported by {@link DynamicObject} at this point in time,
* so it always throws {@link CloneNotSupportedException}, even if the {@link Cloneable}
* interface is implemented in a subclass.
*
* Subclasses may however override this method and create a copy of this object by constructing
* a new object and copying any properties over manually.
*
* @since 20.2.0
* @throws CloneNotSupportedException
*/
@Override
protected Object clone() throws CloneNotSupportedException {
throw cloneNotSupported();
}
@TruffleBoundary
private static CloneNotSupportedException cloneNotSupported() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}
final DynamicObject objectClone() throws CloneNotSupportedException {
return (DynamicObject) super.clone();
}
final Object[] getObjectStore() {
return extRef;
}
final void setObjectStore(Object[] newArray) {
extRef = newArray;
}
final int[] getPrimitiveStore() {
return extVal;
}
final void setPrimitiveStore(int[] newArray) {
extVal = newArray;
}
static Class getDynamicFieldAnnotation() {
return DynamicField.class;
}
private static final Unsafe UNSAFE;
private static final long SHAPE_OFFSET;
static {
UNSAFE = getUnsafe();
try {
SHAPE_OFFSET = getObjectFieldOffset(DynamicObject.class.getDeclaredField("shape"));
} catch (Exception e) {
throw new IllegalStateException("Could not get 'shape' field offset", e);
}
}
@SuppressWarnings("deprecation" /* JDK-8277863 */)
private static long getObjectFieldOffset(Field field) {
return UNSAFE.objectFieldOffset(field);
}
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);
}
}
}
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