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1 /*
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2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.asm.sparc;
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26
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27 import sun.jvm.hotspot.asm.*;
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28
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29 abstract class BranchDecoder extends InstructionDecoder {
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30
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31 // format 2 - condition code names.
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32 // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7.
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33 static final String integerConditionNames[] = {
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34 "bn", "be", "ble", "bl", "bleu", "bcs", "bneg", "bvs",
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35 "ba", "bne", "bg", "bge", "bgu", "bcc", "bpos", "bvc"
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36 };
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37
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38 static final String integerAnnuledConditionNames[] = {
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39 "bn,a", "be,a", "ble,a", "bl,a", "bleu,a", "bcs,a", "bneg,a", "bvs,a",
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40 "ba,a", "bne,a", "bg,a", "bge,a", "bgu,a", "bcc,a", "bpos,a", "bvc,a"
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41 };
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42
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43 // format 2 - condition code names.
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44 // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7.
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45 static final String floatConditionNames[] = {
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46 "fbn", "fbne", "fblg", "fbul", "fbl", "fbug", "fbg", "fbu",
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47 "fba", "fbe", "fbue", "fbge", "fbuge", "fble", "fbule", "fbo"
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48 };
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49
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50 static final String floatAnnuledConditionNames[] = {
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51 "fbn,a", "fbne,a", "fblg,a", "fbul,a", "fbl,a", "fbug,a", "fbg,a", "fbu,a",
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52 "fba,a", "fbe,a", "fbue,a", "fbge,a", "fbuge,a", "fble,a", "fbule,a", "fbo,a"
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53 };
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54
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55 static boolean getAnnuledBit(int instruction) {
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56 return (instruction & ANNUL_MASK) != 0;
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57 }
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58
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59 Instruction decode(int instruction, SPARCInstructionFactory factory) {
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60 boolean isAnnuled = getAnnuledBit(instruction);
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61 int conditionCode = getConditionCode(instruction);
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62 String conditionName = getConditionName(conditionCode, isAnnuled);
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63 int offset = extractSignedIntFromNBits(instruction, 22);
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64 // word align the offset by right shifting 2 bits
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65 offset <<= 2;
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66 PCRelativeAddress addr = new PCRelativeAddress(offset);
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67 return factory.newBranchInstruction(conditionName, addr, isAnnuled, conditionCode);
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68 }
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69
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70 abstract String getConditionName(int conditionCode, boolean isAnnuled);
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71 }
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