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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/InstructionDecoder.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 // basic instruction decoder class
30 abstract class InstructionDecoder implements /* imports */ SPARCOpcodes , RTLDataTypes, RTLOperations {
31 // some general utility functions - for format 2, 3 & 3A instructions
32
33 static int extractSignedIntFromNBits(int value, int num_bits) {
34 return (value << (32 - num_bits)) >> (32 - num_bits);
35 }
36
37 // "rs1"
38 static int getSourceRegister1(int instruction) {
39 return (instruction & RS1_MASK) >>> RS1_START_BIT;
40 }
41
42 // "rs2"
43 static int getSourceRegister2(int instruction) {
44 return (instruction & RS2_MASK);
45 }
46
47 // "rd"
48 static int getDestinationRegister(int instruction) {
49 return (instruction & RD_MASK) >>> RD_START_BIT;
50 }
51
52 static int getConditionCode(int instruction) {
53 return (instruction & CONDITION_CODE_MASK) >>> CONDITION_CODE_START_BIT;
54 }
55
56 // "i" bit - used to indicate whether second component in an indirect
57 // address is immediate value or a register. (format 3 & 3A).
58
59 static boolean isIBitSet(int instruction) {
60 return (instruction & I_MASK) != 0;
61 }
62
63 static ImmediateOrRegister getOperand2(int instruction) {
64 boolean iBit = isIBitSet(instruction);
65 ImmediateOrRegister operand2 = null;
66 if (iBit) {
67 operand2 = new Immediate(new Short((short)extractSignedIntFromNBits(instruction, 13)));
68 } else {
69 operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction));
70 }
71 return operand2;
72 }
73
74 // "opf" - floating point operation code.
75 static int getOpf(int instruction) {
76 return (instruction & OPF_MASK) >>> OPF_START_BIT;
77 }
78
79 abstract Instruction decode(int instruction, SPARCInstructionFactory factory);
80 }