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annotate truffle/com.oracle.truffle.object.basic/src/com/oracle/truffle/object/basic/DefaultStrategy.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents cf203af4610c
children
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1 /*
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2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.object.basic;
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24
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25 import java.util.Objects;
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26
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27 import com.oracle.truffle.api.object.DynamicObject;
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28 import com.oracle.truffle.api.object.Location;
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29 import com.oracle.truffle.api.object.Property;
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30 import com.oracle.truffle.api.object.Shape;
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31 import com.oracle.truffle.object.LayoutImpl;
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32 import com.oracle.truffle.object.LayoutStrategy;
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33 import com.oracle.truffle.object.LocationImpl;
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34 import com.oracle.truffle.object.ShapeImpl;
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35 import com.oracle.truffle.object.ShapeImpl.BaseAllocator;
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36
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37 class DefaultStrategy extends LayoutStrategy {
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38 @Override
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39 public boolean updateShape(DynamicObject object) {
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40 assert object.getShape().isValid();
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41 return false;
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42 }
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43
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44 @Override
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45 public ShapeImpl ensureValid(ShapeImpl newShape) {
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46 assert newShape.isValid();
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47 return newShape;
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48 }
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49
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50 private static boolean assertLocationInRange(ShapeImpl shape, Location location) {
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51 BasicLayout layout = (BasicLayout) shape.getLayout();
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52 assert (shape.getPrimitiveFieldSize() + ((LocationImpl) location).primitiveFieldCount() <= layout.getPrimitiveFieldCount());
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53 assert (shape.getObjectFieldSize() + ((LocationImpl) location).objectFieldCount() <= layout.getObjectFieldCount());
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54 return true;
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55 }
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56
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57 @Override
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58 public ShapeImpl ensureSpace(ShapeImpl shape, Location location) {
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59 Objects.requireNonNull(location);
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60 assert assertLocationInRange(shape, location);
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61 return shape;
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62 }
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63
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64 @Override
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65 public boolean isAutoExtArray() {
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66 return false;
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67 }
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68
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69 @Override
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70 public ShapeAndProperty generalizeProperty(Property oldProperty, Object value, ShapeImpl currentShape, ShapeImpl nextShape) {
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71 Location oldLocation = oldProperty.getLocation();
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72 Location newLocation = ((BasicAllocator) currentShape.allocator()).locationForValueUpcast(value, oldLocation);
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73 Property newProperty = oldProperty.relocate(newLocation);
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74 Shape newShape = nextShape.replaceProperty(oldProperty, newProperty);
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75 return new ShapeAndProperty(newShape, newProperty);
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76 }
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77
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78 @Override
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79 public BaseAllocator createAllocator(ShapeImpl shape) {
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80 return new DefaultAllocatorImpl(shape);
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81 }
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82
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83 @Override
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84 public BaseAllocator createAllocator(LayoutImpl layout) {
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85 return new DefaultAllocatorImpl(layout);
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86 }
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87
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88 public static class DefaultAllocatorImpl extends BasicAllocator {
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89 protected DefaultAllocatorImpl(LayoutImpl layout) {
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90 super(layout);
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91 }
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92
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93 protected DefaultAllocatorImpl(ShapeImpl shape) {
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94 super(shape);
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95 }
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96
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97 @Override
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98 public Location locationForValue(Object value, boolean useFinal, boolean nonNull) {
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99 return super.newDualLocationForValue(value);
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100 }
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101
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102 @Override
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103 public Location declaredLocation(Object value) {
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104 return super.newDeclaredDualLocation(value);
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105 }
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106 }
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107 }