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copied!<p>I would also recommend ASM, but have a look at <a href="http://jasmin.sourceforge.net/" rel="noreferrer">Jasmin</a>, I used it (or: had to use it) for an university-project, and it works quite well, I wrote a lexer/parse/analyzer/optimizer/generator combination for a programing-language using java and jasmin, so generating JVM Code. I uploaded the code <a href="http://www.dbruhn.de/compilerpraktikum" rel="noreferrer">here</a>, the interesting part should be the <a href="http://www.dbruhn.de/compilerpraktikum/src/edu/kit/compilerpraktikum/" rel="noreferrer">source-code itself</a>. In the folder "bytecode/InsanelyFastByteCodeCreator.java" you find a pice of code which transforms an AST Tree into the input format of jasmin assembler. Is quite straight forward.</p> <p>The source-language (which was tranformed to the AST by Lexer+Parser+Analyzer) is a subset of Java called MiniJava. It lacks some "complicated" features like Inheritance, Constructors, static methods, private fields/methods. None of those features are difficult to implement, but there was another task to write an X86 backend (so to generate machine-assembler), and those things tend to get difficult if you got no JVM which handles some things.</p> <p><em>In case you wonder about the strange Class name: The task of the university project was to transform the AST into a a <a href="https://secure.wikimedia.org/wikipedia/en/wiki/Static_single_assignment_form" rel="noreferrer">SSA</a> Graph (so a graph representing the input code), then optimize the graph and then turn the graph into java byte code. That was about 3/4 of the work of the project and the InsanlyFastByteCodeCreator was just a short-cut to test everything.</em></p> <p>Have a look at the "Java Virtual Machine" book from Jon Meyer and Troy Downing. This book heavily references the Jasmin-Assembler, it's quite helpful for understanding the JVM internals.</p>

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