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comparison graal/com.oracle.truffle.object.basic/src/com/oracle/truffle/object/basic/DefaultStrategy.java @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
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18407:f439fdb137a3 18408:2c3666f44855
1 /*
2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.truffle.object.basic;
24
25 import java.util.*;
26
27 import com.oracle.truffle.api.object.*;
28 import com.oracle.truffle.object.*;
29 import com.oracle.truffle.object.ShapeImpl.BaseAllocator;
30
31 class DefaultStrategy implements LayoutStrategy {
32 public boolean updateShape(DynamicObject object) {
33 assert object.getShape().isValid();
34 return false;
35 }
36
37 public Shape returnCached(Shape newShape) {
38 assert newShape.isValid();
39 return newShape;
40 }
41
42 private static boolean assertLocationInRange(Shape shape, Location location) {
43 BasicLayout layout = (BasicLayout) shape.getLayout();
44 assert (shape.getPrimitiveFieldSize() + ((LocationImpl) location).primitiveFieldCount() <= layout.getPrimitiveFieldCount());
45 assert (shape.getObjectFieldSize() + ((LocationImpl) location).objectFieldCount() <= layout.getObjectFieldCount());
46 return true;
47 }
48
49 public Shape ensureSpace(Shape shape, Location location) {
50 Objects.requireNonNull(location);
51 assert assertLocationInRange(shape, location);
52 return shape;
53 }
54
55 public boolean isAutoExtArray() {
56 return false;
57 }
58
59 public Property generalizeProperty(DynamicObject object, Property oldProperty, Object value) {
60 Shape oldShape = object.getShape();
61 Location oldLocation = oldProperty.getLocation();
62 Location newLocation = ((BasicAllocator) oldShape.allocator()).locationForValueUpcast(value, oldLocation);
63 Property newProperty = oldProperty.relocate(newLocation);
64 Shape newShape = oldShape.replaceProperty(oldProperty, newProperty);
65 newProperty.setSafe(object, value, oldShape, newShape);
66 return newProperty;
67 }
68
69 public Property generalizeProperty(DynamicObject object, Property oldProperty, Object value, Shape currentShape, Shape oldNewShape) {
70 Location oldLocation = oldProperty.getLocation();
71 Location newLocation = ((BasicAllocator) currentShape.allocator()).locationForValueUpcast(value, oldLocation);
72 Property newProperty = oldProperty.relocate(newLocation);
73 Shape newShape = oldNewShape.replaceProperty(oldProperty, newProperty);
74 newProperty.setSafe(object, value, currentShape, newShape);
75 return newProperty;
76 }
77
78 public BaseAllocator createAllocator(Shape shape) {
79 return new DefaultAllocatorImpl((ShapeImpl) shape);
80 }
81
82 public BaseAllocator createAllocator(Layout layout) {
83 return new DefaultAllocatorImpl((LayoutImpl) layout);
84 }
85
86 public static class DefaultAllocatorImpl extends BasicAllocator {
87 protected DefaultAllocatorImpl(LayoutImpl layout) {
88 super(layout);
89 }
90
91 protected DefaultAllocatorImpl(ShapeImpl shape) {
92 super(shape);
93 }
94
95 @Override
96 public Location locationForValue(Object value, boolean useFinal, boolean nonNull) {
97 return super.newDualLocationForValue(value);
98 }
99
100 @Override
101 public Location declaredLocation(Object value) {
102 return super.newDeclaredDualLocation(value);
103 }
104 }
105 }