Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Layout.java @ 18407:f439fdb137a3
Truffle: initial commit of object API
author | Andreas Woess <andreas.woess@jku.at> |
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date | Tue, 18 Nov 2014 16:18:45 +0100 |
parents | |
children | b1530a6cce8c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Layout.java Tue Nov 18 16:18:45 2014 +0100 @@ -0,0 +1,110 @@ +/* + * Copyright (c) 2013, 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. 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.object; + +import java.util.*; + +import com.oracle.truffle.api.nodes.NodeUtil.FieldOffsetProvider; +import com.oracle.truffle.api.object.Shape.*; + +public abstract class Layout { + public static final EnumSet<ImplicitCast> NONE = EnumSet.noneOf(ImplicitCast.class); + public static final EnumSet<ImplicitCast> INT_TO_DOUBLE = EnumSet.of(ImplicitCast.IntToDouble); + public static final EnumSet<ImplicitCast> INT_TO_LONG = EnumSet.of(ImplicitCast.IntToLong); + + public static final String OPTION_PREFIX = "truffle.object."; + + private static final LayoutFactory LAYOUT_FACTORY = loadLayoutFactory(); + + public enum ImplicitCast { + IntToDouble, + IntToLong, + } + + public static Layout createLayout() { + return createLayout(NONE); + } + + public static Layout createLayout(EnumSet<ImplicitCast> allowedImplicitCasts) { + return new LayoutBuilder().setAllowedImplicitCasts(allowedImplicitCasts).build(); + } + + public static Layout createLayout(EnumSet<ImplicitCast> allowedImplicitCasts, FieldOffsetProvider fieldOffsetProvider) { + return new LayoutBuilder().setAllowedImplicitCasts(allowedImplicitCasts).setFieldOffsetProvider(fieldOffsetProvider).build(); + } + + public abstract DynamicObject newInstance(Shape shape); + + public abstract Class<? extends DynamicObject> getType(); + + public abstract Shape createShape(ObjectType operations); + + public abstract Shape createShape(ObjectType operations, Object sharedData); + + public abstract Shape createShape(ObjectType operations, Object sharedData, int id); + + /** + * Create an allocator for static property creation. Reserves all array extension slots. + */ + public abstract Allocator createAllocator(); + + protected static LayoutFactory getFactory() { + return LAYOUT_FACTORY; + } + + private static LayoutFactory loadLayoutFactory() { + LayoutFactory bestLayoutFactory = null; + + String layoutFactoryImplClassName = System.getProperty(OPTION_PREFIX + "LayoutFactory"); + if (layoutFactoryImplClassName != null) { + Class<?> clazz; + try { + clazz = Class.forName(layoutFactoryImplClassName); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + try { + bestLayoutFactory = (LayoutFactory) clazz.newInstance(); + } catch (InstantiationException | IllegalAccessException e) { + throw new AssertionError(e); + } + } else { + ServiceLoader<LayoutFactory> serviceLoader = ServiceLoader.load(LayoutFactory.class, Layout.class.getClassLoader()); + for (LayoutFactory currentLayoutFactory : serviceLoader) { + if (bestLayoutFactory == null) { + bestLayoutFactory = currentLayoutFactory; + } else if (currentLayoutFactory.getPriority() >= bestLayoutFactory.getPriority()) { + assert currentLayoutFactory.getPriority() != bestLayoutFactory.getPriority(); + bestLayoutFactory = currentLayoutFactory; + } + } + } + + if (bestLayoutFactory == null) { + throw new AssertionError("LayoutFactory not found"); + } + return bestLayoutFactory; + } +}