--- old/agent/src/share/classes/sun/jvm/hotspot/asm/sparc/InstructionDecoder.java Wed Aug 26 18:20:17 2009 +++ /dev/null Wed Aug 26 18:20:17 2009 @@ -1,80 +0,0 @@ -/* - * 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.*; - -// basic instruction decoder class -abstract class InstructionDecoder implements /* imports */ SPARCOpcodes , RTLDataTypes, RTLOperations { - // some general utility functions - for format 2, 3 & 3A instructions - - static int extractSignedIntFromNBits(int value, int num_bits) { - return (value << (32 - num_bits)) >> (32 - num_bits); - } - - // "rs1" - static int getSourceRegister1(int instruction) { - return (instruction & RS1_MASK) >>> RS1_START_BIT; - } - - // "rs2" - static int getSourceRegister2(int instruction) { - return (instruction & RS2_MASK); - } - - // "rd" - static int getDestinationRegister(int instruction) { - return (instruction & RD_MASK) >>> RD_START_BIT; - } - - static int getConditionCode(int instruction) { - return (instruction & CONDITION_CODE_MASK) >>> CONDITION_CODE_START_BIT; - } - - // "i" bit - used to indicate whether second component in an indirect - // address is immediate value or a register. (format 3 & 3A). - - static boolean isIBitSet(int instruction) { - return (instruction & I_MASK) != 0; - } - - static ImmediateOrRegister getOperand2(int instruction) { - boolean iBit = isIBitSet(instruction); - ImmediateOrRegister operand2 = null; - if (iBit) { - operand2 = new Immediate(new Short((short)extractSignedIntFromNBits(instruction, 13))); - } else { - operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction)); - } - return operand2; - } - - // "opf" - floating point operation code. - static int getOpf(int instruction) { - return (instruction & OPF_MASK) >>> OPF_START_BIT; - } - - abstract Instruction decode(int instruction, SPARCInstructionFactory factory); -}