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com.tangosol.dev.assembler.OpConst Maven / Gradle / Ivy
/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.dev.assembler;
import java.io.IOException;
import java.io.DataInput;
import java.io.DataOutput;
/**
* This abstract class implements the field operators (GETSTATIC, PUTSTATIC,
* GETFIELD, and PUTFIELD), the method operators (INVOKEVIRTUAL,
* INVOKESPECIAL, INVOKESTATIC, and INVOKEINTERFACE), NEW, ANEWARRAY,
* CHECKCAST, INSTANCEOF, and MULTIANEWARRAY.
*
* @version 0.50, 06/12/98, assembler/dis-assembler
* @author Cameron Purdy
*/
public abstract class OpConst extends Op implements Constants
{
// ----- constructors ---------------------------------------------------
/**
* Construct the op.
*
* @param iOp the op value
* @param constant the Constant referenced by the op
*/
public OpConst(int iOp, Constant constant)
{
super(iOp);
m_constant = constant;
if (constant == null)
{
throw new IllegalArgumentException(CLASS +
": Constant must not be null!");
}
}
// ----- Object operations ----------------------------------------------
/**
* Produce a human-readable string describing the byte code.
*
* @return a string describing the byte code
*/
public String toString()
{
return format(null, getName() + ' ' + m_constant.format(), null);
}
/**
* Produce a human-readable string describing the byte code.
*
* @return a string describing the byte code
*/
public String toJasm()
{
return getName() + ' ' + m_constant.format();
}
// ----- VMStructure operations -----------------------------------------
/**
* The pre-assembly step collects the necessary entries for the constant
* pool. During this step, all constants used by this VM structure and
* any sub-structures are registered with (but not yet bound by position
* in) the constant pool.
*
* @param pool the constant pool for the class which needs to be
* populated with the constants required to build this
* VM structure
*/
protected void preassemble(ConstantPool pool)
{
pool.registerConstant(m_constant);
}
/**
* The assembly process assembles and writes the structure to the passed
* output stream, resolving any dependencies using the passed constant
* pool.
*
* @param stream the stream implementing java.io.DataOutput to which to
* write the assembled VM structure
* @param pool the constant pool for the class which by this point
* contains the entire set of constants required to build
* this VM structure
*/
protected void assemble(DataOutput stream, ConstantPool pool)
throws IOException
{
int iOp = super.getValue();
int iConst = pool.findConstant(m_constant);
stream.writeByte(iOp);
stream.writeShort(iConst);
}
// ----- Op operations --------------------------------------------------
/**
* Calculate and set the size of the assembled op based on the offset of
* the op and the constant pool which is passed.
*
* @param pool the constant pool for the class which by this point
* contains the entire set of constants required to build
* this VM structure
*/
protected void calculateSize(ConstantPool pool)
{
// op + 2-byte constant index
setSize(3);
}
// ----- accessors ------------------------------------------------------
public Constant getConstant()
{
return m_constant;
}
// ----- data members ---------------------------------------------------
/**
* The name of this class.
*/
private static final String CLASS = "OpConst";
/**
* The Constant referenced by this op.
*/
private Constant m_constant;
}
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