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comparison graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/field/AlignedImmediateOperandField.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children bc8527f3071c
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3732:3e2e8b8abdaf 3733:e233f5660da4
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.gen.risc.field;
24
25 import java.util.*;
26
27 import com.sun.max.asm.*;
28 import com.sun.max.asm.gen.*;
29 import com.sun.max.asm.gen.risc.bitRange.*;
30
31 /**
32 * An instruction field whose encoded value does not include bits for
33 * the low-order 0 bits of the aligned values that the field represents.
34 * This class can convert between the field's <i>argument</i> (i.e.
35 * the represented value) and it's <i>operand</i> (i.e. the encoded value).
36 */
37 public class AlignedImmediateOperandField extends ImmediateOperandField {
38
39 protected int zeroes;
40
41 public AlignedImmediateOperandField(BitRange bitRange, int zeroes) {
42 super(bitRange);
43 this.zeroes = zeroes;
44 }
45
46 @Override
47 public String asJavaExpression() {
48 final String value = valueString();
49 return "(" + super.asJavaExpression() + ") && ((" + value + " % " + grain() + ") == 0)";
50 }
51
52 @Override
53 public boolean check(Template template, List<Argument> arguments) {
54 if (!super.check(template, arguments)) {
55 return false;
56 }
57 final long value = template.bindingFor(this, arguments).asLong();
58 return (value % grain()) == 0;
59 }
60
61 @Override
62 public int maxArgumentValue() {
63 return super.maxArgumentValue() << zeroes();
64 }
65
66 @Override
67 public int minArgumentValue() {
68 return super.minArgumentValue() << zeroes();
69 }
70
71 @Override
72 public int zeroes() {
73 return zeroes;
74 }
75
76 /**
77 * Converts an argument value to the operand value that does not include bits for the
78 * implied low-order 0 bits that the aligned argument value is guaranteed to contain.
79 * For example, if this field represents a 4-byte aligned value, then {@code argumentToOperand(536) == 134}.
80 */
81 private int argumentToOperand(int value) throws AssemblyException {
82 final int p = grain();
83 if (value % p != 0) {
84 throw new AssemblyException("unaligned immediate operand: " + value);
85 }
86 return value / p;
87 }
88
89 /**
90 * Converts an operand value to the argument value that includes
91 * low-order 0 bits for the alignment of this field.
92 * For example, if this field represents a 4-byte aligned value,
93 * then {@code operandToArgument(134) == 536}.
94 */
95 private int operandToArgument(int operand) {
96 return operand << zeroes();
97 }
98
99 @Override
100 public int assemble(int value) throws IndexOutOfBoundsException, AssemblyException {
101 return super.assemble(argumentToOperand(value));
102 }
103
104 @Override
105 public Immediate32Argument disassemble(int instruction) {
106 return new Immediate32Argument(operandToArgument(extract(instruction)));
107 }
108 }