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With inspiration from other libraries
There is a newer version: 2.12.15
/*
 * [The "BSD license"]
 *  Copyright (c) 2011 Terence Parr
 *  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 name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
 */
package org.stringtemplate.v4.compiler;

import org.stringtemplate.v4.misc.Interval;
import org.stringtemplate.v4.misc.Misc;

import java.util.ArrayList;
import java.util.List;

public class BytecodeDisassembler {
    CompiledST code;

    public BytecodeDisassembler(CompiledST code) { this.code = code; }

    public String instrs() {
        StringBuilder buf = new StringBuilder();
        int ip=0;
        while (ip0 ) buf.append(", ");
            int opcode = code.instrs[ip];
            Bytecode.Instruction I = Bytecode.instructions[opcode];
            buf.append(I.name);
            ip++;
            for (int opnd=0; opnd=code.codeSize ) {
			throw new IllegalArgumentException("ip out of range: "+ip);
		}
        Bytecode.Instruction I =
            Bytecode.instructions[opcode];
        if ( I==null ) {
            throw new IllegalArgumentException("no such instruction "+opcode+
				" at address "+ip);
        }
        String instrName = I.name;
        buf.append( String.format("%04d:\t%-14s", ip, instrName) );
        ip++;
        if ( I.nopnds ==0 ) {
            buf.append("  ");
            return ip;
        }
        List operands = new ArrayList();
        for (int i=0; i0 ) buf.append(", ");
            buf.append( s );
        }
        return ip;
    }

    private String showConstPoolOperand(int poolIndex) {
        StringBuilder buf = new StringBuilder();
        buf.append("#");
        buf.append(poolIndex);
        String s = "";
        if ( poolIndex