Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/SPARCDisassembler.java @ 132:60b728ec77c1
6652736: well known classes in system dictionary are inefficiently processed
Summary: combine many scalar variables into a single enum-indexed array in SystemDictionary.
Reviewed-by: kvn
author | jrose |
---|---|
date | Tue, 29 Apr 2008 19:45:22 -0700 |
parents | a61af66fc99e |
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.*; import java.io.*; import java.util.*; public abstract class SPARCDisassembler extends Disassembler implements /* imports */ SPARCOpcodes, RTLDataTypes, RTLOperations { // instruction cache - Map<Integer, Instruction>. protected static Map instructionCache = new HashMap(); protected final SPARCInstructionFactory factory; public SPARCDisassembler(long startPc, byte[] code, SPARCInstructionFactory factory) { super(startPc, code); this.factory = factory; } protected static InstructionDecoder illegalDecoder = new IllegalInstructionDecoder(); protected static InstructionDecoder callDecoder = new CallDecoder(); // direct call instruction protected Instruction decodeFormat1Instruction(int instruction) { return callDecoder.decode(instruction, factory); } protected abstract InstructionDecoder getFormat2Decoder(int op2); protected Instruction decodeFormat2Instruction(int instruction) { int op2 = (instruction & OP_2_MASK) >>> OP_2_START_BIT; InstructionDecoder decoder = getFormat2Decoder(op2); return decoder.decode(instruction, factory); } // "op3" - used in format 3 & 3A instructions - 6 bits width protected static int getOp3(int instruction) { return (instruction & OP_3_MASK) >>> OP_3_START_BIT; } // op3 opcodes is broken up into column and row. MSB 2 bits form column. // LSB 4 bits form row number. protected static int getOp3Row(int op3) { return op3 & 0xF; } protected static int getOp3Column(int op3) { return (op3 >>> 4) & 0x3; } protected abstract InstructionDecoder getFormat3Decoder(int row, int column); // memory instructions protected Instruction decodeFormat3Instruction(int instruction) { int op3 = getOp3(instruction); int row = getOp3Row(op3); int column = getOp3Column(op3); return getFormat3Decoder(row, column).decode(instruction, factory); } protected abstract InstructionDecoder getFormat3ADecoder(int row, int column); // arithmetic, logic, shift and the rest protected Instruction decodeFormat3AInstruction(int instruction) { int op3 = getOp3(instruction); int row = getOp3Row(op3); int column = getOp3Column(op3); return getFormat3ADecoder(row, column).decode(instruction, factory); } public void decode(InstructionVisitor visitor) { visitor.prologue(); try { DataInputStream dis = new DataInputStream(new ByteArrayInputStream(code)); int instruction = -1; int format = -1; Instruction instr = null; int len = 0; while (len < code.length) { instr = null; instruction = dis.readInt(); // check whether we have this in cache. instr = (Instruction) instructionCache.get(new Integer(instruction)); if (instr == null) { format = (instruction & FORMAT_MASK) >>> FORMAT_START_BIT; switch (format) { case FORMAT_2: // 0 instr = decodeFormat2Instruction(instruction); break; case FORMAT_1: // 1 instr = decodeFormat1Instruction(instruction); break; case FORMAT_3A: // 2 instr = decodeFormat3AInstruction(instruction); break; case FORMAT_3: // 3 instr = decodeFormat3Instruction(instruction); break; } // add the new instruction to cache. instructionCache.put(new Integer(instruction), instr); } visitor.visit(startPc + len, instr); len += 4; } } catch (IOException ioExp) { // ignore, can't happen } finally { visitor.epilogue(); } } }