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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 apache@apache.org.
- *
- * 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
- * <http://www.apache.org/>.
- */
- import java.io.DataOutputStream;
- import java.io.IOException;
-
- import org.aspectj.apache.bcel.Constants;
- import org.aspectj.apache.bcel.util.ByteSequence;
-
- /**
- * Abstract super class for instructions dealing with local variables.
- *
- * @version $Id: LocalVariableInstruction.java,v 1.5 2006/11/29 13:43:01 aclement Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- */
- public abstract class LocalVariableInstruction extends Instruction
- implements TypedInstruction, IndexedInstruction {
- protected int n = -1; // index of referenced variable
- private short c_tag = -1; // compact version, such as ILOAD_0
- private short canon_tag = -1; // canonical tag such as ILOAD
-
- private final boolean wide() { return n > Constants.MAX_BYTE; }
-
- /**
- * Empty constructor needed for the Class.newInstance() statement in
- * Instruction.readInstruction(). Not to be used otherwise.
- * tag and length are defined in readInstruction and initFromFile, respectively.
- */
- LocalVariableInstruction(short canon_tag, short c_tag) {
- super();
- this.canon_tag = canon_tag;
- this.c_tag = c_tag;
- }
-
- /**
- * Empty constructor needed for the Class.newInstance() statement in
- * Instruction.readInstruction(). Also used by IINC()!
- */
- LocalVariableInstruction() {
- }
-
- /**
- * @param opcode Instruction opcode
- * @param c_tag Instruction number for compact version, ALOAD_0, e.g.
- * @param n local variable index (unsigned short)
- */
- protected LocalVariableInstruction(short opcode, short c_tag, int n) {
- super(opcode, (short)2);
-
- this.c_tag = c_tag;
- canon_tag = opcode;
-
- setIndex(n);
- }
-
- /**
- * Dump instruction as byte code to stream out.
- * @param out Output stream
- */
- public void dump(DataOutputStream out) throws IOException {
- if(wide()) // Need WIDE prefix ?
- out.writeByte(Constants.WIDE);
-
- out.writeByte(opcode);
-
- if(length > 1) { // Otherwise ILOAD_n, instruction, e.g.
- if(wide())
- out.writeShort(n);
- else
- out.writeByte(n);
- }
- }
-
- /**
- * Long output format:
- *
- * <name of opcode> "["<opcode number>"]"
- * "("<length of instruction>")" "<"< local variable index>">"
- *
- * @param verbose long/short format switch
- * @return mnemonic for instruction
- */
- 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) + " " + n;
- }
-
- /**
- * Read needed data (e.g. index) from file.
- * PRE: (ILOAD <= tag <= ALOAD_3) || (ISTORE <= tag <= ASTORE_3)
- */
- protected void initFromFile(ByteSequence bytes, boolean wide)
- throws IOException
- {
- if(wide) {
- n = bytes.readUnsignedShort();
- } else if(((opcode >= Constants.ILOAD) &&
- (opcode <= Constants.ALOAD)) ||
- ((opcode >= Constants.ISTORE) &&
- (opcode <= Constants.ASTORE))) {
- n = bytes.readUnsignedByte();
- } else if(opcode <= Constants.ALOAD_3) { // compact load instruction such as ILOAD_2
- n = (opcode - Constants.ILOAD_0) % 4;
- } else { // Assert ISTORE_0 <= tag <= ASTORE_3
- n = (opcode - Constants.ISTORE_0) % 4;
- }
- workOutLength();
- }
-
- private void workOutLength() {
- if(n >= 0 && n <= 3) { // Use more compact instruction xLOAD_n
- opcode = (short)(c_tag + n);
- length = 1;
- } else {
- opcode = canon_tag;
- if(wide()) length = 4;
- else length = 2;
- }
- }
-
- /**
- * @return local variable index referred by this instruction.
- */
- public final int getIndex() { return n; }
-
- /**
- * Set the local variable index
- */
- public void setIndex(int n) {
- if((n < 0) || (n > Constants.MAX_SHORT))
- throw new ClassGenException("Illegal value: " + n);
-
- this.n = n;
- workOutLength();
- }
-
- /** @return canonical tag for instruction, e.g., ALOAD for ALOAD_0
- */
- public short getCanonicalTag() {
- return canon_tag;
- }
-
- /**
- * Returns the type associated with the instruction -
- * in case of ALOAD or ASTORE Type.OBJECT is returned.
- * This is just a bit incorrect, because ALOAD and ASTORE
- * may work on every ReferenceType (including Type.NULL) and
- * ASTORE may even work on a ReturnaddressType .
- * @return type associated with the instruction
- */
- public Type getType(ConstantPoolGen cp) {
- switch(canon_tag) {
- case Constants.ILOAD: case Constants.ISTORE:
- return Type.INT;
- case Constants.LLOAD: case Constants.LSTORE:
- return Type.LONG;
- case Constants.DLOAD: case Constants.DSTORE:
- return Type.DOUBLE;
- case Constants.FLOAD: case Constants.FSTORE:
- return Type.FLOAT;
- case Constants.ALOAD: case Constants.ASTORE:
- return Type.OBJECT;
-
- default: throw new ClassGenException("Oops: unknown case in switch" + canon_tag);
- }
- }
- }
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