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view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9RegisterBranchDecoder.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
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 V9RegisterBranchDecoder extends V9BranchDecoder { static int getDisp16(int instruction) { int offset = (DISP_16_LO_MASK & instruction) | ((DISP_16_HI_MASK & instruction) >>> (DISP_16_HI_START_BIT - DISP_16_LO_NUMBITS)); // sign extend and word align offset = extractSignedIntFromNBits(offset, 16); offset <<= 2; return offset; } String getConditionName(int conditionCode, boolean isAnnuled) { return null; } abstract String getRegisterConditionName(int rcond); public Instruction decode(int instruction, SPARCInstructionFactory factory) { SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; int rcond = (BRANCH_RCOND_MASK & instruction) >>> BRANCH_RCOND_START_BIT; if (rcond == BRANCH_RCOND_RESERVED1 || rcond == BRANCH_RCOND_RESERVED2) return factory.newIllegalInstruction(instruction); SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction)); boolean predictTaken = getPredictTaken(instruction); boolean annuled = getAnnuledBit(instruction); PCRelativeAddress addr = new PCRelativeAddress(getDisp16(instruction)); String name = getRegisterConditionName(rcond); return v9factory.newV9RegisterBranchInstruction(name, addr, annuled, rcond, rs1, predictTaken); } }