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annotate agent/src/share/classes/sun/jvm/hotspot/asm/sparc/InstructionDecoder.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
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| rev | line source |
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| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.asm.sparc; | |
| 26 | |
| 27 import sun.jvm.hotspot.asm.*; | |
| 28 | |
| 29 // basic instruction decoder class | |
| 30 abstract class InstructionDecoder implements /* imports */ SPARCOpcodes , RTLDataTypes, RTLOperations { | |
| 31 // some general utility functions - for format 2, 3 & 3A instructions | |
| 32 | |
| 33 static int extractSignedIntFromNBits(int value, int num_bits) { | |
| 34 return (value << (32 - num_bits)) >> (32 - num_bits); | |
| 35 } | |
| 36 | |
| 37 // "rs1" | |
| 38 static int getSourceRegister1(int instruction) { | |
| 39 return (instruction & RS1_MASK) >>> RS1_START_BIT; | |
| 40 } | |
| 41 | |
| 42 // "rs2" | |
| 43 static int getSourceRegister2(int instruction) { | |
| 44 return (instruction & RS2_MASK); | |
| 45 } | |
| 46 | |
| 47 // "rd" | |
| 48 static int getDestinationRegister(int instruction) { | |
| 49 return (instruction & RD_MASK) >>> RD_START_BIT; | |
| 50 } | |
| 51 | |
| 52 static int getConditionCode(int instruction) { | |
| 53 return (instruction & CONDITION_CODE_MASK) >>> CONDITION_CODE_START_BIT; | |
| 54 } | |
| 55 | |
| 56 // "i" bit - used to indicate whether second component in an indirect | |
| 57 // address is immediate value or a register. (format 3 & 3A). | |
| 58 | |
| 59 static boolean isIBitSet(int instruction) { | |
| 60 return (instruction & I_MASK) != 0; | |
| 61 } | |
| 62 | |
| 63 static ImmediateOrRegister getOperand2(int instruction) { | |
| 64 boolean iBit = isIBitSet(instruction); | |
| 65 ImmediateOrRegister operand2 = null; | |
| 66 if (iBit) { | |
| 67 operand2 = new Immediate(new Short((short)extractSignedIntFromNBits(instruction, 13))); | |
| 68 } else { | |
| 69 operand2 = SPARCRegisters.getRegister(getSourceRegister2(instruction)); | |
| 70 } | |
| 71 return operand2; | |
| 72 } | |
| 73 | |
| 74 // "opf" - floating point operation code. | |
| 75 static int getOpf(int instruction) { | |
| 76 return (instruction & OPF_MASK) >>> OPF_START_BIT; | |
| 77 } | |
| 78 | |
| 79 abstract Instruction decode(int instruction, SPARCInstructionFactory factory); | |
| 80 } |