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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><meta http-equiv="Content-Type"content="text/html; charset=iso-8859-1"><title>Frequently Asked Questions About Jikes Parser Generator (January 27, 1999)</title></head><body><h2 align="center">The IBM Research Jikes Compiler Project</h2><h2 align="center">http://www.ibm.com/research/jikes</h2><h2 align="center">Frequently Asked Questions About Jikes Parser Generator</h2><h2 align="center">January 27, 1999</h2><p><h3><a href="#what_is"><b>What is Jikes Parser Generator?</b></a> </h3><h3><a href="#whyis"><b>Why is IBM Research making the source available?</b></a></h3><h3><a href="#whatibm"><b>What does IBM Research plan to do with the source?</b></a></h3><h3><a href="#whatcanido"><b>What can I do with the source?</b></a></h3><h3><a href="#build"><b>How do I compile the source?</b></a></h3><h3><a href="#test"><b>How do I test the parser generator?</b></a></h3><h3><a href="#wheredoc"><b>Do you have any program documentation?</b></a></h3><h3><a href="#bugs"><b>How do I report bugs?</b></a></h3><h3><a name="what_is"><b>What is Jikes Parser Generator?</b></a></h3><p>Jikes Parser Generator is the parser generator used by the JikesCompiler. It takes as input an annotated version of the Java languagegrammar and produces as output program source and data that is partof the source for the Jikes compiler.<p>The current version is written in <code>C</code> and reflects itsancient origins; inparticular, the parser generator was written at a time when memorywas at a premium (work on it began over fifteen years ago), and was designed to be able to process a grammarfor Ada in less that 300K running on an original model IBM PC.<h3><a name="whyis"><b>Why is IBM Research making the source available?</b></a></h3><p>IBM Research is releasing the source for the parser generator as acompanion effort to the release of the source for the Jikes Compiler.The parser generator is used to generate some of the files thatcomprise the Jikes parser, and so its release makes the fullsource of the Jikes compiler available in a form not dependent onmachine-generated code.<p>The release of Jikes<sup><small>TM</small></sup> Parser Generatordoes not establish a policy for the rest of IBM outside of Research,nor does it define a standard Source License for Research. OtherSource agreements from IBM, including IBM Research, if and when theydo come, are likely to be more restrictive with respect to commercialuse -- we are allowing almost any use for Jikes because we believe itbenefits the Java community and doesn't give away any intellectualproperty.<h3><a name="whatibm"><b>What does IBM Research plan to do with the source?</b></a></h3><p>We have no plans to actively work on the source right now, as wewant to devote our efforts to improving the Jikes compiler.<p>If time permits, we would anticipate recoding the parsergenerator in a more modern language, most likely Java. <h3><a name="whatcanido"><b>What can I do with the source?</b></a></h3><p>Don't forget to read the license carefully. It explains in detail what you can and cannot do.<p>You can pretty much do whatever you want -- as long as we get someacknowledgment. You can distribute it in binary or source form, takeall or part of it and put it in something else, and then redistributeit. It's all up to you.<p>However, IBM retains control of the names "IBM" and "Jikes<sup><small>TM</small></sup>". Youcan't use them without our permission.<p>You are under no obligation to tell us what you are doing with thesource, or to inform us of any changes you make.<h3><a name="build"><b>How do I compile the source?</b></a></h3><p>We provide a simple Makefile that works for the IBM AIX system. You willneed to adapt it as necessary for other systems. This shouldn't be hard, as theparser generator is just a medium-sized <code>c</code> program that makes few demands on the standard libraries.<p>To build the source from scratch, do:<pre> cd jikespg/src make clean make</pre><h3><a name="test"><b>How do I test the parser generator?</b></a></h3><p>Two small example programs are included with the parser generator source: <code>bnf</code>and <code>expr</code>.<p>To try <code>bnf</code>, a simple demonstration of a bnf parser, do:<pre> cd jikespg/examples/bnf make java Main example1.bnf java Main example2.bnf</pre><p>To try <code>expr</code>, a simple Java expression evaluator, do:<pre> cd jikespg/examples/bnf make java Main </pre>and type in sample expressions, such as <code>2+4</code> when prompted.<p>You can also bootstrap the parser generator. First, note the size of the executable, then do:<pre> jikespg jikespg.g make</pre>and see if the size of the executable is the same (it should be).<p>You can try it with Jikes as follows:<pre> cd jikes/src touch java.g jikespg java</pre>The files produced by running <code>jikespg</code> should agree withthe versions that were present before running <code>jikespg</code>.<h3><a name="wheredoc"><b>Do you have any program documentation?</b></a></h3><p>All that is availalble now is the source. As is common with manyworks in progress, we have only had time to comment the source as ithas evolved.<h3><a name="bugs"><b>How do I report bugs?</b></a></h3><p>Please send mail to the mail list<code>jikes-bugs@watson.ibm.com</code>. You need to subscribe to thislist before you can post mail; instructions on how to subscribe canbe found at <a href="http://www.ibm.com/research/jikes/subscribe">http://www.ibm.com/research/jikes/subscribe</a>.Note that only minimal support, indeed possibly no support at all, isoffered at the present time.</body></html>⌨️ 快捷键说明
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