/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/* ====================================================================
* 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.
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* 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/)."
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* if and wherever such third-party acknowledgments normally appear.
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* SUCH DAMAGE.
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*
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* information on the Apache Software Foundation, please see
*/
/**
* Abstract super class for instructions dealing with local variables.
*
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
implements TypedInstruction, IndexedInstruction {
protected int n = -1; // index of referenced variable
/**
* 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.
*/
super();
}
/**
* Empty constructor needed for the Class.newInstance() statement in
* Instruction.readInstruction(). Also used by IINC()!
*/
}
/**
* @param opcode Instruction opcode
* @param c_tag Instruction number for compact version, ALOAD_0, e.g.
* @param n local variable index (unsigned short)
*/
super(opcode, (short)2);
setIndex(n);
}
/**
* Dump instruction as byte code to stream out.
* @param out Output stream
*/
if(wide()) // Need WIDE prefix ?
if(wide())
out.writeShort(n);
else
}
}
/**
* Long output format:
*
* <name of opcode> "["<opcode number>"]"
* "("<length of instruction>")" "<"< local variable index>">"
*
* @return mnemonic for instruction
*/
else
}
/**
* Read needed data (e.g. index) from file.
* PRE: (ILOAD <= tag <= ALOAD_3) || (ISTORE <= tag <= ASTORE_3)
*/
throws IOException
{
if(wide) {
n = bytes.readUnsignedShort();
length = 4;
n = bytes.readUnsignedByte();
length = 2;
length = 1;
} else { // Assert ISTORE_0 <= tag <= ASTORE_3
length = 1;
}
}
/**
* @return local variable index referred by this instruction.
*/
public final int getIndex() { return n; }
/**
* Set the local variable index
*/
public void setIndex(int n) {
throw new ClassGenException("Illegal value: " + n);
this.n = n;
if(n >= 0 && n <= 3) { // Use more compact instruction xLOAD_n
length = 1;
} else {
if(wide()) // Need WIDE prefix ?
length = 4;
else
length = 2;
}
}
/** @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
*/
switch(canon_tag) {
}
}
}