Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/InstructionDecoder.java @ 3945:8ed53447f690
Merge
author | iveresov |
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date | Thu, 15 Sep 2011 12:44:09 -0700 |
parents | c18cbe5936b8 |
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/* * Copyright (c) 2002, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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); }