Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/asm/sparc/SPARCDisassembler.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/asm/sparc/SPARCDisassembler.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,144 @@ +/* + * 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(); + } + } +}