Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/BranchDecoder.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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/* * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.asm.sparc; import sun.jvm.hotspot.asm.*; abstract class BranchDecoder extends InstructionDecoder { // format 2 - condition code names. // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7. static final String integerConditionNames[] = { "bn", "be", "ble", "bl", "bleu", "bcs", "bneg", "bvs", "ba", "bne", "bg", "bge", "bgu", "bcc", "bpos", "bvc" }; static final String integerAnnuledConditionNames[] = { "bn,a", "be,a", "ble,a", "bl,a", "bleu,a", "bcs,a", "bneg,a", "bvs,a", "ba,a", "bne,a", "bg,a", "bge,a", "bgu,a", "bcc,a", "bpos,a", "bvc,a" }; // format 2 - condition code names. // Appendix F - Opcodes and Condition Codes - Page 231 - Table F-7. static final String floatConditionNames[] = { "fbn", "fbne", "fblg", "fbul", "fbl", "fbug", "fbg", "fbu", "fba", "fbe", "fbue", "fbge", "fbuge", "fble", "fbule", "fbo" }; static final String floatAnnuledConditionNames[] = { "fbn,a", "fbne,a", "fblg,a", "fbul,a", "fbl,a", "fbug,a", "fbg,a", "fbu,a", "fba,a", "fbe,a", "fbue,a", "fbge,a", "fbuge,a", "fble,a", "fbule,a", "fbo,a" }; static boolean getAnnuledBit(int instruction) { return (instruction & ANNUL_MASK) != 0; } Instruction decode(int instruction, SPARCInstructionFactory factory) { boolean isAnnuled = getAnnuledBit(instruction); int conditionCode = getConditionCode(instruction); String conditionName = getConditionName(conditionCode, isAnnuled); int offset = extractSignedIntFromNBits(instruction, 22); // word align the offset by right shifting 2 bits offset <<= 2; PCRelativeAddress addr = new PCRelativeAddress(offset); return factory.newBranchInstruction(conditionName, addr, isAnnuled, conditionCode); } abstract String getConditionName(int conditionCode, boolean isAnnuled); }