Landon Curt Noll
cbc022d864
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<link rel="stylesheet" href="../../ioccc.css">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>2011/richards - Most surprisingly portable</title>
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<meta name="description" content="2011 IOCCC entry richards - Most surprisingly portable">
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<meta name="keywords" content="IOCCC, 2011, IOCCC 2011, IOCCC entry, richards, Most surprisingly portable">
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2011/richards - Most surprisingly portable</h2>
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<div class="topnav">
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<a class="Left" href="../konno/index.html">← konno</a>
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<a class="Left" href="../index.html">↑ 2011 ↑</a>
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<a class="Left" href="../toledo/index.html">toledo →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2011/richards/richards.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2011/richards/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a href="#content">Jump to contents</a>
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<a href="../../index.html">IOCCC Home</a>
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<a href="../../years.html">Winning Entries</a>
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<a href="../../authors.html">People who have won</a>
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<a href="../../location.html">Location of authors</a>
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<a href="../../news.html">IOCCC News</a>
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<a href="../../faq.html#submit">How to enter the IOCCC</a>
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<a href="../../faq.html">FAQ</a>
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<hr>
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<div class="sidenav">
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<a href="../../bugs.html">Bugs & (mis)features</a>
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<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
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<a href="../../faq.html#fix_web_site">Fixing the web site</a>
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<a href="../../faq.html#fix_author">Fixing author info</a>
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<a href="../../thanks-for-help.html">Thanks for the help</a>
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<hr>
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<div class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</a>
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<a href="../../contact.html">Contacting the IOCCC</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Gregor_Richards">Gregor Richards</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
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<br><br></li>
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</ul>
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<h2 id="to-build">To build:</h2>
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<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span></span></code></pre></div>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<pre><code>STATUS: doesn't work with some platforms - please help us fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2011_richards">2011 richards bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="bu">echo</span> expression <span class="kw">|</span> <span class="ex">./richards</span></span></code></pre></div>
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<h2 id="try">Try:</h2>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Oh no, yet another
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<a href="https://en.wikipedia.org/wiki/Dc_(computer_program)">dc</a>-style calculator? (see
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<a href="../../2000/dlowe/index.html">2000/dlowe</a> using an embedded Perl interpreter and deemed <code>Worst Abuse of the Rules</code>). Well, this one does it (expression calculation, that is,
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not the rule abuse) in a different way. The author claims that his calculator
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does just-in-time compilation. What would you do to prove or disprove his claim
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without attempting to unravel the source?</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This is an implementation of the classic UNIX
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<a href="https://en.wikipedia.org/wiki/Dc_(computer_program)">dc</a> command, the
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<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">reverse Polish</a>
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calculator. Actually it’s a pretty bad implementation, since it only implements
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32-bit integers (well, <code>sizeof(int)</code>-sized integers). It only implements the
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commands <code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, <code>p</code> (only for numbers), register stacks, macros and
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comparisons. Wow, you’d think I could’ve done better in 2K of code.</p>
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<p>OH! I forgot to mention! It’s a
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<a href="https://en.wikipedia.org/wiki/Just-in-time_compilation">JIT</a>.</p>
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<p>Wait, don’t stop reading! I know what you’re thinking, platform-specific code is
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discouraged in IOCCC. But do you see any platform-specific code? There’s no
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assembler here! This
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<a href="https://en.wikipedia.org/wiki/Just-in-time_compilation">JIT</a> works on a dozen
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platforms, and the only platform-specific assumptions it makes are that the
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stack grows down and integers are at least 32-bit.</p>
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<p>You will probably get warnings while compiling the code. In particular:</p>
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<ul>
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<li><p>If your system requires the inclusion of <code>alloca.h</code> to use alloca, use the
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compile flag <code>-DAH</code>.</p></li>
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<li><p>If your system cannot use <code>mmap()</code>, use the compile flag <code>-DNM</code>.</p></li>
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<li><p>I don’t include any headers I don’t strictly need to, so you’ll get warnings
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about (at least) <code>memcpy()</code>, <code>isdigit()</code>, <code>atoi()</code>, <code>calloc()</code>, <code>malloc()</code>
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and <code>alloca()</code> if you didn’t use <code>-DAH</code>.</p>
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<ul>
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<li>NOTE from judges: we added these includes in 2023.</li>
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</ul></li>
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<li><p>GCC likes to complain about <code>while (a = b)</code> (assignments as a condition).</p></li>
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<li><p>I don’t return from <code>main()</code>, even though it’s declared to return <code>int</code>.</p></li>
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</ul>
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<p>Platforms on which all known/tested optimization levels work with no additional
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flags:</p>
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<ul>
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<li>gcc 4.6.2 + x86[_64] + GNU/Linux, Mac OS X or Windows</li>
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<li>clang 2.9-16 + x86[_64] + GNU/Linux or Mac OS X</li>
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<li>tcc 0.9.25</li>
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<li>gcc 4.4.5 + alpha, arm, mips[el], powerpc[64], s390x (IBM zSeries)</li>
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<li>gcc 4.1.3 + vax + NetBSD</li>
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</ul>
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<p>Platforms which work but not at all optimization levels or needing special
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flags:</p>
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<ul>
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<li>owcc 1.9 + x86 + Windows: Needs <code>-DNM -DAH -fno-stack-check</code></li>
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<li>gcc 4.4.5 + sh4: -O0 works, higher optimization levels don’t work for unknown reasons.</li>
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</ul>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<h1 id="inventory-for-2011richards"><a name="inventory"></a>Inventory for 2011/richards</h1>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/richards.c">richards.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/richards.alt.c">richards.alt.c</a> - alternative source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/richards.orig.c">richards.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/try.alt.sh">try.alt.sh</a> - how to run alternative code</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/try.sh">try.sh</a> - how to run</li>
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<li><a href="2011_richards.tar.bz2">2011_richards.tar.bz2</a> - download entry source</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="index.html">index.html</a> - entry home page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/README.md">README.md</a> - markdown source for index.html</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2011/richards/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href=".path">.path</a> - directory path from top directory</li>
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</ul>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div class="footer">
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<h2>Copyright and CC BY-SA 4.0 License</h2>
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<p>This file and web page is:</p>
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<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
|
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<p>You are free to share and adapt this file under the terms of this license:</p>
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<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
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<p>For more information, see:</p>
|
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<blockquote><a
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href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2011%2Frichards%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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