/
ObjectLayoutTest.java
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/
ObjectLayoutTest.java
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/*
* Copyright (c) 2017-2022 Software Architecture Group, Hasso Plattner Institute
* Copyright (c) 2021-2022 Oracle and/or its affiliates
*
* Licensed under the MIT License.
*/
package de.hpi.swa.trufflesqueak.test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
import de.hpi.swa.trufflesqueak.image.SqueakImageChunk;
import de.hpi.swa.trufflesqueak.model.AbstractPointersObject;
import de.hpi.swa.trufflesqueak.model.ClassObject;
import de.hpi.swa.trufflesqueak.model.NilObject;
import de.hpi.swa.trufflesqueak.model.PointersObject;
import de.hpi.swa.trufflesqueak.model.layout.SlotLocation;
import de.hpi.swa.trufflesqueak.nodes.accessing.AbstractPointersObjectNodes.AbstractPointersObjectReadNode;
import de.hpi.swa.trufflesqueak.nodes.accessing.AbstractPointersObjectNodes.AbstractPointersObjectWriteNode;
import de.hpi.swa.trufflesqueak.nodes.accessing.SqueakObjectNewNode;
@SuppressWarnings("static-method")
public final class ObjectLayoutTest extends AbstractSqueakTestCaseWithDummyImage {
@Test
public void testBasic() {
final AbstractPointersObjectReadNode readNode = AbstractPointersObjectReadNode.getUncached();
final AbstractPointersObjectWriteNode writeNode = AbstractPointersObjectWriteNode.getUncached();
final ClassObject dummyClass = createFreshTestClass();
final PointersObject obj1 = instantiate(dummyClass);
/* Ensure object is initialized correctly. */
assertEquals(30, obj1.getNumSlots());
assertUnsetPrimitiveFields(obj1);
assertUnsetObjectFields(obj1);
for (final SlotLocation location : obj1.getLayout().getLocations()) {
assertTrue("All locations must be uninitialized", location.isUninitialized());
}
for (int i = 0; i < obj1.getNumSlots(); i++) {
assertSame("All reads should return nil", readNode.execute(obj1, i), NilObject.SINGLETON);
}
/* Ensure nil writes do not change uninitialized locations. */
for (int i = 0; i < obj1.getNumSlots(); i++) {
writeNode.executeNil(obj1, i);
}
for (final SlotLocation location : obj1.getLayout().getLocations()) {
assertTrue("All locations should be uninitialized", location.isUninitialized());
}
writeAndValidate(obj1, 0, 0L);
assertEquals(0L, obj1.primitive0);
final PointersObject obj2 = instantiate(dummyClass);
assertSame(obj1.getLayout(), obj2.getLayout());
writeAndValidate(obj2, 0, 42L);
assertEquals(42L, obj2.primitive0);
assertSame("Long write should not change layout", obj1.getLayout(), obj2.getLayout());
writeAndValidate(obj1, 1, dummyClass);
assertTrue("Write produces valid layout", obj1.getLayout().isValid());
assertFalse("Write invalidates older layouts", obj2.getLayout().isValid());
assertNotSame("Layouts should be out of sync", obj1.getLayout(), obj2.getLayout());
assertSame(obj1.object0, dummyClass);
assertSame(readNode.execute(obj2, 1), NilObject.SINGLETON);
assertFalse("Read does not update layout", obj2.getLayout().isValid());
assertNotSame("Layouts should still be out of sync after read", obj1.getLayout(), obj2.getLayout());
writeAndValidate(obj2, 12, 1234L);
assertEquals(1234L, obj2.primitive1);
writeAndValidate(obj1, 12, image.bitmapClass);
assertFalse("obj2 should have outdated layout", obj2.getLayout().isValid());
assertEquals(1234L, (long) readNode.execute(obj2, 12));
writeAndValidate(obj2, 11, image.bitmapClass);
assertTrue("obj2 should have valid layout after write", obj2.getLayout().isValid());
assertEquals("Primitive slot should be unset", 0L, obj2.primitive1);
assertEquals("Object slot should be used for primitive value", 1234L, (long) obj2.object1);
}
@Test
public void testTransitions() {
final PointersObject obj = instantiate(createFreshTestClass());
/* Fill with three different primitive values. */
writeAndValidate(obj, 0, true);
writeAndValidate(obj, 24, '&');
writeAndValidate(obj, 12, 1234L);
assertNull(obj.primitiveExtension);
assertUnsetObjectFields(obj);
/* Fill with another double primitive value. */
writeAndValidate(obj, 16, 98.76D);
assertEquals(1, obj.primitiveExtension.length);
/* Fill all slots with double values. */
for (int i = 0; i < obj.getNumSlots(); i++) {
writeAndValidate(obj, i, (double) i + 1);
}
final int expectedGenericLocations = 3;
assertEquals(obj.getNumSlots() - SlotLocation.NUM_PRIMITIVE_INLINE_LOCATIONS - expectedGenericLocations, obj.primitiveExtension.length);
assertNotSame(obj.object0, NilObject.SINGLETON);
assertNotSame(obj.object1, NilObject.SINGLETON);
assertNotSame(obj.object2, NilObject.SINGLETON);
assertNull(obj.objectExtension);
writeAndValidate(obj, 26, '#');
assertEquals(1, obj.objectExtension.length);
assertEquals('#', obj.objectExtension[0]);
writeAndValidate(obj, 22, false);
assertEquals(2, obj.objectExtension.length);
assertEquals(false, obj.objectExtension[1]);
}
@Test
public void testFullObject() {
final PointersObject obj = instantiate(createFreshTestClass());
/* Fill entirely with primitive values. */
for (int i = 0; i < obj.getNumSlots(); i++) {
writeAndValidate(obj, i, (long) i + 42);
}
assertUnsetObjectFields(obj);
for (final SlotLocation location : obj.getLayout().getLocations()) {
assertTrue("All locations should be primitive", location.isPrimitive());
assertTrue("All locations should be set", location.isSet(obj));
}
assertEquals(42L, obj.primitive0);
assertEquals(43L, obj.primitive1);
assertEquals(44L, obj.primitive2);
assertEquals(obj.getNumSlots() - SlotLocation.NUM_PRIMITIVE_INLINE_LOCATIONS, obj.primitiveExtension.length);
for (int i = 0; i < obj.primitiveExtension.length; i++) {
assertEquals(obj.primitiveExtension[i], SlotLocation.NUM_PRIMITIVE_INLINE_LOCATIONS + i + 42L);
}
/* Fill entirely with specialObjectsArray. */
for (int i = 0; i < obj.getNumSlots(); i++) {
writeAndValidate(obj, i, image.specialObjectsArray);
}
for (final SlotLocation location : obj.getLayout().getLocations()) {
assertTrue("All locations should be generic", !location.isPrimitive() && !location.isUninitialized());
assertTrue("All locations should be set", location.isSet(obj));
}
assertSame(obj.object0, image.specialObjectsArray);
assertSame(obj.object1, image.specialObjectsArray);
assertSame(obj.object2, image.specialObjectsArray);
assertEquals(obj.getNumSlots() - SlotLocation.NUM_OBJECT_INLINE_LOCATIONS, obj.objectExtension.length);
for (final Object object : obj.objectExtension) {
assertSame(object, image.specialObjectsArray);
}
assertUnsetPrimitiveFields(obj);
}
private static void assertUnsetPrimitiveFields(final AbstractPointersObject obj) {
assertEquals(0L, obj.primitive0);
assertEquals(0L, obj.primitive1);
assertEquals(0L, obj.primitive2);
assertNull(obj.primitiveExtension);
}
private static void assertUnsetObjectFields(final AbstractPointersObject obj) {
assertSame(obj.object0, NilObject.SINGLETON);
assertSame(obj.object1, NilObject.SINGLETON);
assertSame(obj.object2, NilObject.SINGLETON);
assertNull(obj.objectExtension);
}
private static ClassObject createFreshTestClass() {
final ClassObject dummyClass = new ClassObject(image);
final SqueakImageChunk dummyChunk = SqueakImageChunk.createDummyChunk(image, new Object[]{
image.nilClass.getSuperclass(), null,
// Format:
65542L /* `Morph format` */ | 24 /* + 24 slot = 30 slots in total. */,
null, null
});
dummyClass.fillin(dummyChunk);
return dummyClass;
}
private static PointersObject instantiate(final ClassObject dummyClass) {
return (PointersObject) SqueakObjectNewNode.getUncached().execute(image, dummyClass);
}
private static void writeAndValidate(final AbstractPointersObject obj, final int index, final Object value) {
AbstractPointersObjectWriteNode.getUncached().execute(obj, index, value);
assertEquals("Write failed", AbstractPointersObjectReadNode.getUncached().execute(obj, index), value);
}
}