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package org.aspectj.apache.bcel.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
/**
* Abstract super class for instructions dealing with local variables.
*
* @version $Id: InstructionLV.java,v 1.5 2009/10/05 17:35:36 aclement Exp $
* @author M. Dahm
*/
public class InstructionLV extends Instruction {
protected int lvar = -1;
public InstructionLV(short opcode, int lvar) {
super(opcode);
this.lvar = lvar;
}
public InstructionLV(short opcode) {
super(opcode);
}
public void dump(DataOutputStream out) throws IOException {
if (lvar == -1) {
out.writeByte(opcode);
} else {
if (lvar < 4) {
if (opcode == ALOAD) {
out.writeByte(ALOAD_0 + lvar);
} else if (opcode == ASTORE) {
out.writeByte(ASTORE_0 + lvar);
} else if (opcode == ILOAD) {
out.writeByte(ILOAD_0 + lvar);
} else if (opcode == ISTORE) {
out.writeByte(ISTORE_0 + lvar);
} else if (opcode == DLOAD) {
out.writeByte(DLOAD_0 + lvar);
} else if (opcode == DSTORE) {
out.writeByte(DSTORE_0 + lvar);
} else if (opcode == FLOAD) {
out.writeByte(FLOAD_0 + lvar);
} else if (opcode == FSTORE) {
out.writeByte(FSTORE_0 + lvar);
} else if (opcode == LLOAD) {
out.writeByte(LLOAD_0 + lvar);
} else if (opcode == LSTORE) {
out.writeByte(LSTORE_0 + lvar);
} else {
if (wide()) {
out.writeByte(Constants.WIDE);
}
out.writeByte(opcode);
if (wide()) {
out.writeShort(lvar);
} else {
out.writeByte(lvar);
}
}
} else {
if (wide()) {
out.writeByte(Constants.WIDE);
}
out.writeByte(opcode);
if (wide()) {
out.writeShort(lvar);
} else {
out.writeByte(lvar);
}
}
}
}
/**
* Long output format:
*
* 'name of opcode' "[" 'opcode number' "]" "(" 'length of instruction' ")" "<" 'local variable index' ">"
*/
public String toString(boolean verbose) {
if (opcode >= Constants.ILOAD_0 && opcode <= Constants.ALOAD_3 || opcode >= Constants.ISTORE_0
&& opcode <= Constants.ASTORE_3) {
return super.toString(verbose);
} else {
return super.toString(verbose) + (lvar != -1 && lvar < 4 ? "_" : " ") + lvar;
}
}
public boolean isALOAD() {
return opcode == ALOAD || opcode >= ALOAD_0 && opcode <= ALOAD_3;
}
public boolean isASTORE() {
return opcode == ASTORE || opcode >= ASTORE_0 && opcode <= ASTORE_3;
}
public int getBaseOpcode() {
if (opcode >= ILOAD && opcode <= ALOAD || opcode >= ISTORE && opcode <= ASTORE) {
// not an optimized instruction
return opcode;
}
if (opcode >= Constants.ILOAD_0 && opcode <= Constants.ALOAD_3) {
int ret = opcode - ILOAD_0;
ret = ret - ret % 4;
ret = ret / 4;
return ret + ILOAD;
}
int ret = opcode - ISTORE_0;
ret = ret - ret % 4;
ret = ret / 4;
return ret + ISTORE;
}
/**
* @return local variable index referred by this instruction.
*/
// optimize!
public final int getIndex() {
if (lvar != -1) {
return lvar;
}
if (opcode >= Constants.ILOAD_0 && opcode <= Constants.ALOAD_3) {
return (opcode - Constants.ILOAD_0) % 4;
} else if (opcode >= Constants.ISTORE_0 && opcode <= Constants.ASTORE_3) {
return (opcode - Constants.ISTORE_0) % 4;
}
return -1;
}
public void setIndex(int i) {
// Switching the index for a load/store without a current index specified (ie. an aload_1 or istore_2)
// means we need to should adjust to a normal aload/istore opcode
if (getIndex() != i) {
if (opcode >= Constants.ILOAD_0 && opcode <= Constants.ALOAD_3) {
opcode = (short) (ILOAD + (opcode - ILOAD_0) / 4);
} else if (opcode >= Constants.ISTORE_0 && opcode <= Constants.ASTORE_3) {
opcode = (short) (ISTORE + (opcode - ISTORE_0) / 4);
}
this.lvar = i;
}
}
public boolean canSetIndex() {
return true;
}
public InstructionLV setIndexAndCopyIfNecessary(int newIndex) {
if (canSetIndex()) {
setIndex(newIndex);
return this;
} else {
if (getIndex() == newIndex) {
return this;
}
InstructionLV newInstruction = null;
int baseOpCode = getBaseOpcode();
if (newIndex < 4) {
if (isStoreInstruction()) {
newInstruction = (InstructionLV) InstructionConstants.INSTRUCTIONS[(baseOpCode - Constants.ISTORE) * 4
+ Constants.ISTORE_0 + newIndex];
} else {
newInstruction = (InstructionLV) InstructionConstants.INSTRUCTIONS[(baseOpCode - Constants.ILOAD) * 4
+ Constants.ILOAD_0 + newIndex];
}
} else {
newInstruction = new InstructionLV((short) baseOpCode, newIndex);
}
// if (getBaseOpcode()!=newInstruction.getBaseOpcode() || newInstruction.getIndex()!=newIndex) {
// throw new
// RuntimeException("New Instruction created does not appear to be valid: originalBaseOpcode="+getBaseOpcode()+
// " newBaseOpcode="+newInstruction.getBaseOpcode());
// }
return newInstruction;
}
}
public int getLength() {
int size = Constants.iLen[opcode];
if (lvar == -1) {
return size;
} else {
if (lvar < 4) {
if (opcode == ALOAD || opcode == ASTORE) {
return 1;
} else if (opcode == ILOAD || opcode == ISTORE) {
return 1;
} else if (opcode == DLOAD || opcode == DSTORE) {
return 1;
} else if (opcode == FLOAD || opcode == FSTORE) {
return 1;
} else if (opcode == LLOAD || opcode == LSTORE) {
return 1;
} else {
if (wide()) {
return size + 2;
}
return size;
}
} else {
if (wide()) {
return size + 2;
}
return size;
}
}
}
private final boolean wide() {
return lvar > Constants.MAX_BYTE;
}
public boolean equals(Object other) {
if (!(other instanceof InstructionLV)) {
return false;
}
InstructionLV o = (InstructionLV) other;
return o.opcode == opcode && o.lvar == lvar;
}
public int hashCode() {
return opcode * 37 + lvar;
}
}
