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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2014, 2014, 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.
*
* 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.object.basic;
import java.util.Objects;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Location;
import com.oracle.truffle.object.LayoutImpl;
import com.oracle.truffle.object.LayoutStrategy;
import com.oracle.truffle.object.LocationImpl;
import com.oracle.truffle.object.ShapeImpl;
import com.oracle.truffle.object.ShapeImpl.BaseAllocator;
class DefaultStrategy extends LayoutStrategy {
@Override
public boolean updateShape(DynamicObject object) {
assert object.getShape().isValid();
return false;
}
@Override
public ShapeImpl ensureValid(ShapeImpl newShape) {
assert newShape.isValid();
return newShape;
}
private static boolean assertLocationInRange(ShapeImpl shape, Location location) {
BasicLayout layout = (BasicLayout) shape.getLayout();
assert (shape.getPrimitiveFieldSize() + ((LocationImpl) location).primitiveFieldCount() <= layout.getPrimitiveFieldCount());
assert (shape.getObjectFieldSize() + ((LocationImpl) location).objectFieldCount() <= layout.getObjectFieldCount());
return true;
}
@Override
public ShapeImpl ensureSpace(ShapeImpl shape, Location location) {
Objects.requireNonNull(location);
assert assertLocationInRange(shape, location);
return shape;
}
@Override
public BaseAllocator createAllocator(ShapeImpl shape) {
return new DefaultAllocatorImpl(shape);
}
@Override
public BaseAllocator createAllocator(LayoutImpl layout) {
return new DefaultAllocatorImpl(layout);
}
static class DefaultAllocatorImpl extends BasicAllocator {
protected DefaultAllocatorImpl(LayoutImpl layout) {
super(layout);
}
protected DefaultAllocatorImpl(ShapeImpl shape) {
super(shape);
}
@Override
public Location locationForValue(Object value, boolean useFinal, boolean nonNull) {
return super.newDualLocationForValue(value);
}
@Override
public Location declaredLocation(Object value) {
return super.newDeclaredDualLocation(value);
}
}
}
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