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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/BranchDecoder.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 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.sparc;
26
27 import sun.jvm.hotspot.asm.*;
28
29 abstract class BranchDecoder extends InstructionDecoder {
30
31 // format 2 - condition code names.
32 // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7.
33 static final String integerConditionNames[] = {
34 "bn", "be", "ble", "bl", "bleu", "bcs", "bneg", "bvs",
35 "ba", "bne", "bg", "bge", "bgu", "bcc", "bpos", "bvc"
36 };
37
38 static final String integerAnnuledConditionNames[] = {
39 "bn,a", "be,a", "ble,a", "bl,a", "bleu,a", "bcs,a", "bneg,a", "bvs,a",
40 "ba,a", "bne,a", "bg,a", "bge,a", "bgu,a", "bcc,a", "bpos,a", "bvc,a"
41 };
42
43 // format 2 - condition code names.
44 // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7.
45 static final String floatConditionNames[] = {
46 "fbn", "fbne", "fblg", "fbul", "fbl", "fbug", "fbg", "fbu",
47 "fba", "fbe", "fbue", "fbge", "fbuge", "fble", "fbule", "fbo"
48 };
49
50 static final String floatAnnuledConditionNames[] = {
51 "fbn,a", "fbne,a", "fblg,a", "fbul,a", "fbl,a", "fbug,a", "fbg,a", "fbu,a",
52 "fba,a", "fbe,a", "fbue,a", "fbge,a", "fbuge,a", "fble,a", "fbule,a", "fbo,a"
53 };
54
55 static boolean getAnnuledBit(int instruction) {
56 return (instruction & ANNUL_MASK) != 0;
57 }
58
59 Instruction decode(int instruction, SPARCInstructionFactory factory) {
60 boolean isAnnuled = getAnnuledBit(instruction);
61 int conditionCode = getConditionCode(instruction);
62 String conditionName = getConditionName(conditionCode, isAnnuled);
63 int offset = extractSignedIntFromNBits(instruction, 22);
64 // word align the offset by right shifting 2 bits
65 offset <<= 2;
66 PCRelativeAddress addr = new PCRelativeAddress(offset);
67 return factory.newBranchInstruction(conditionName, addr, isAnnuled, conditionCode);
68 }
69
70 abstract String getConditionName(int conditionCode, boolean isAnnuled);
71 }