Mercurial > hg > truffle
comparison graal/com.oracle.max.asmdis/src/com/sun/max/asm/OffsetLiteral.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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1 /* | |
2 * Copyright (c) 2007, 2011, 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.sun.max.asm; | |
24 | |
25 /** | |
26 * Represents an offset between two positions (represented by given labels) in the assembled code. | |
27 */ | |
28 public class OffsetLiteral extends MutableAssembledObject { | |
29 | |
30 /** | |
31 * Creates an offset between two positions (represented by given labels) in the assembled code. | |
32 * | |
33 * @param base the label whose position marks the base of the offset | |
34 * @param target the label whose position marks the target of the offset | |
35 */ | |
36 protected OffsetLiteral(Assembler assembler, int startPosition, int endPosition, Label target, Label base) { | |
37 super(assembler, startPosition, endPosition); | |
38 assembler.addFixedSizeAssembledObject(this); | |
39 this.target = target; | |
40 this.base = base; | |
41 } | |
42 | |
43 private final Label target; | |
44 private final Label base; | |
45 | |
46 @Override | |
47 protected final void assemble() throws AssemblyException { | |
48 final Assembler assembler = assembler(); | |
49 final long offset = offset(); | |
50 // select the correct assembler function to emit the offset. | |
51 // The assembler knows the endianness to use | |
52 switch(size()) { | |
53 case 1: | |
54 assembler.emitByte((byte) (offset & 0xFF)); | |
55 break; | |
56 case 2: | |
57 assembler.emitShort((short) (offset & 0xFFFF)); | |
58 break; | |
59 case 4: | |
60 assembler.emitInt((int) (offset & 0xFFFFFFFF)); | |
61 break; | |
62 case 8: | |
63 assembler.emitLong(offset); | |
64 break; | |
65 default: | |
66 throw new AssemblyException("Invalid size for offset literal"); | |
67 } | |
68 } | |
69 | |
70 public final long offset() throws AssemblyException { | |
71 return target.position() - base.position(); | |
72 } | |
73 | |
74 public final boolean isCode() { | |
75 return false; | |
76 } | |
77 } |