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 }