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<h1>The International Obfuscated C Code Contest</h1>
<h2>2011/richards - Most surprisingly portable</h2>
<h3>JIT dc</h3>
</div>
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<a class="Left" href="../konno/index.html">← 2011/konno</a>
<a class="Left" href="../index.html">↑ 2011 ↑</a>
<a class="Left" href="../toledo/index.html">2011/toledo →</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2011/richards/richards.c">C code</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2011/richards/Makefile">Makefile</a>
<a class="Right" href="#inventory">Inventory</a>
<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2011%2Frichards%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Gregor_Richards">Gregor Richards</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: doesn’t work with some platforms - please help us fix it</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2011_richards">2011/richards in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> echo expression | ./richards</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Oh no, yet another
<a href="https://en.wikipedia.org/wiki/Dc_(computer_program)">dc</a>-style calculator? (see
<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,
not the rule abuse) in a different way. The author claims that his calculator
does just-in-time compilation. What would you do to prove or disprove his claim
without attempting to unravel the source?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This is an implementation of the classic UNIX
<a href="https://en.wikipedia.org/wiki/Dc_(computer_program)">dc</a> command, the
<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">reverse Polish</a>
calculator. Actually it’s a pretty bad implementation, since it only implements
32-bit integers (well, <code>sizeof(int)</code>-sized integers). It only implements the
commands <code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, <code>p</code> (only for numbers), register stacks, macros and
comparisons. Wow, you’d think I could’ve done better in 2K of code.</p>
<p>OH! I forgot to mention! It’s a
<a href="https://en.wikipedia.org/wiki/Just-in-time_compilation">JIT</a>.</p>
<p>Wait, don’t stop reading! I know what you’re thinking, platform-specific code is
discouraged in IOCCC. But do you see any platform-specific code? There’s no
assembler here! This
<a href="https://en.wikipedia.org/wiki/Just-in-time_compilation">JIT</a> works on a dozen
platforms, and the only platform-specific assumptions it makes are that the
stack grows down and integers are at least 32-bit.</p>
<p>You will probably get warnings while compiling the code. In particular:</p>
<ul>
<li><p>If your system requires the inclusion of <code>alloca.h</code> to use alloca, use the
compile flag <code>-DAH</code>.</p></li>
<li><p>If your system cannot use <code>mmap()</code>, use the compile flag <code>-DNM</code>.</p></li>
<li><p>I don’t include any headers I don’t strictly need to, so you’ll get warnings
about (at least) <code>memcpy()</code>, <code>isdigit()</code>, <code>atoi()</code>, <code>calloc()</code>, <code>malloc()</code>
and <code>alloca()</code> if you didn’t use <code>-DAH</code>.</p>
<ul>
<li><strong>NOTE from judges</strong>: we added these includes in 2023.</li>
</ul></li>
<li><p>GCC likes to complain about <code>while (a = b)</code> (assignments as a condition).</p></li>
<li><p>I don’t return from <code>main()</code>, even though it’s declared to return <code>int</code>.</p></li>
</ul>
<p>Platforms on which all known/tested optimization levels work with no additional
flags:</p>
<ul>
<li>gcc 4.6.2 + x86[_64] + GNU/Linux, Mac OS X or Windows</li>
<li>clang 2.9-16 + x86[_64] + GNU/Linux or Mac OS X</li>
<li>tcc 0.9.25</li>
<li>gcc 4.4.5 + alpha, arm, mips[el], powerpc[64], s390x (IBM zSeries)</li>
<li>gcc 4.1.3 + vax + NetBSD</li>
</ul>
<p>Platforms which work but not at all optimization levels or needing special
flags:</p>
<ul>
<li>owcc 1.9 + x86 + Windows: Needs <code>-DNM -DAH -fno-stack-check</code></li>
<li>gcc 4.4.5 + sh4: <code>-O0</code> works, higher optimization levels don’t work for unknown reasons.</li>
</ul>
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<div id="inventory">
<h1 id="inventory-for-2011richards">Inventory for 2011/richards</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/richards.c">richards.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/richards.alt.c">richards.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/richards.orig.c">richards.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/try.alt.sh">try.alt.sh</a> - script to try alternate code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2011_richards.tar.bz2">2011_richards.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/richards/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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