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comparison agent/src/share/classes/sun/jvm/hotspot/asm/x86/FloatGRPDecoder.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2002-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.asm.x86;
26
27 import sun.jvm.hotspot.asm.*;
28
29 public class FloatGRPDecoder extends FPInstructionDecoder {
30
31 final private int number;
32
33 //Please refer to IA-32 Intel Architecture Software Developer's Manual Volume 2
34 //APPENDIX A - Escape opcodes
35
36 private static final FPInstructionDecoder floatGRPMap[][] = {
37 /* d9_2 */
38 {
39 new FPInstructionDecoder("fnop"),
40 null,
41 null,
42 null,
43 null,
44 null,
45 null,
46 null
47 },
48 /* d9_4 */
49 {
50 new FPInstructionDecoder("fchs"),
51 new FPInstructionDecoder("fabs"),
52 null,
53 null,
54 new FPInstructionDecoder("ftst"),
55 new FPInstructionDecoder("fxam"),
56 null,
57 null
58 },
59 /* d9_5 */
60 {
61 new FPInstructionDecoder("fld1"),
62 new FPInstructionDecoder("fldl2t"),
63 new FPInstructionDecoder("fldl2e"),
64 new FPInstructionDecoder("fldpi"),
65 new FPInstructionDecoder("fldlg2"),
66 new FPInstructionDecoder("fldln2"),
67 new FPInstructionDecoder("fldz"),
68 null
69 },
70 /* d9_6 */
71 {
72 new FPInstructionDecoder("f2xm1"),
73 new FPInstructionDecoder("fyl2x"),
74 new FPInstructionDecoder("fptan"),
75 new FPInstructionDecoder("fpatan"),
76 new FPInstructionDecoder("fxtract"),
77 new FPInstructionDecoder("fprem1"),
78 new FPInstructionDecoder("fdecstp"),
79 new FPInstructionDecoder("fincstp")
80 },
81 /* d9_7 */
82 {
83 new FPInstructionDecoder("fprem"),
84 new FPInstructionDecoder("fyl2xp1"),
85 new FPInstructionDecoder("fsqrt"),
86 new FPInstructionDecoder("fsincos"),
87 new FPInstructionDecoder("frndint"),
88 new FPInstructionDecoder("fscale"),
89 new FPInstructionDecoder("fsin"),
90 new FPInstructionDecoder("fcos")
91 },
92 /* da_5 */
93 {
94 null,
95 new FPInstructionDecoder("fucompp"),
96 null,
97 null,
98 null,
99 null,
100 null,
101 null
102 },
103 /* db_4 */
104 {
105 new FPInstructionDecoder("feni(287 only)"),
106 new FPInstructionDecoder("fdisi(287 only)"),
107 new FPInstructionDecoder("fNclex"),
108 new FPInstructionDecoder("fNinit"),
109 new FPInstructionDecoder("fNsetpm(287 only)"),
110 null,
111 null,
112 null
113 },
114 /* de_3 */
115 {
116 null,
117 new FPInstructionDecoder("fcompp"),
118 null,
119 null,
120 null,
121 null,
122 null,
123 null
124 },
125 /* df_4 */
126 {
127 new FPInstructionDecoder("fNstsw"),
128 null,
129 null,
130 null,
131 null,
132 null,
133 null,
134 null
135 }
136 };
137
138 public FloatGRPDecoder(String name, int number) {
139 super(name);
140 this.number = number;
141 }
142
143 public Instruction decode(byte[] bytesArray, int index, int instrStartIndex, int segmentOverride, int prefixes, X86InstructionFactory factory) {
144 this.byteIndex = index;
145 this.instrStartIndex = instrStartIndex;
146 this.prefixes = prefixes;
147
148 int ModRM = readByte(bytesArray, byteIndex);
149 int rm = ModRM & 7;
150
151 FPInstructionDecoder instrDecoder = null;
152 instrDecoder = floatGRPMap[number][rm];
153
154 Instruction instr = null;
155 if(instrDecoder != null) {
156 instr = instrDecoder.decode(bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
157 byteIndex = instrDecoder.getCurrentIndex();
158 } else {
159 instr = factory.newIllegalInstruction();
160 }
161 return instr;
162 }
163 }