Typo fixes and change 'download entry source' to 'download entry' as it's the tarball, not the source itself. Rebuilt .entry.json and index.html files for all entries.
393 lines
22 KiB
HTML
393 lines
22 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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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>2001/anonymous - Dishonorable mention</title>
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<meta name="description" content="2001 IOCCC entry anonymous - Dishonorable mention">
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<meta name="keywords" content="IOCCC, 2001, IOCCC 2001, IOCCC entry, anonymous, Dishonorable mention">
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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>2001/anonymous - Dishonorable mention</h2>
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<div class="topnav">
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<a class="Left Disabled" href="#">first entry</a>
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<a class="Left" href="../index.html">↑ 2001 ↑</a>
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<a class="Left" href="../bellard/index.html">bellard →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2001/anonymous/anonymous.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2001/anonymous/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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</div>
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<div class="sidenav">
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<a href="#content">Jump to contents</a>
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<hr>
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<div class="sidenav">
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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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</div>
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<hr>
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<div class="sidenav">
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<a href="../../news.html">IOCCC News</a>
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<a href="../../status.html">Contest status</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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</div>
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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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</div>
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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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</div>
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<hr>
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<div class="sidenav">
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<a href="#top">Jump to top</a>
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<a name="content"></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#Anonymous_2001">Anonymous 2001</a><br>
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</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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<p>The programs that this program is supposed to act on,
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<a href="anonymous.ten.c">anonymous.ten.c</a> and <a href="anonymous.bed.c">anonymous.bed.c</a>,
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compiled with <code>make</code>, MUST be compiled as 32-bit ELF binaries. In the case that
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this fails these programs will be compiled as 64-bit binaries as alternate code,
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<code>anonymous.ten.alt</code> and <code>anonymous.bed.alt</code>, ELF or otherwise. However trying to
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use the entry on these files will fail. See <a href="#alternate-code">Alternate code</a>
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below for information on how to compile these programs as 64-bit binaries (or
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whatever your system will compile them as).</p>
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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: INABIAF - please **DO NOT** fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2001_anonymous">2001 anonymous 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="ex">./anonymous</span> x86_program</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>
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<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./anonymous</span> anonymous.bed <span class="co"># if able to compile as a 32-bit (-m32) ELF binary</span></span></code></pre></div>
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<p>NOTE: if the 32-bit version cannot be compiled the script will at least compile
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<a href="anonymous.ten.c">anonymous.ten</a> as a 64-bit program (or whatever your system is
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set to) and run it directly.</p>
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<p>What happens if the x86 program has already been modified by this program? The
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judges’ remarks below might give you a hint!</p>
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<p>What happens if you try it on another file like <a href="anonymous.c">anonymous.c</a>? Can
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you recompile it okay? What if you run it on <code>anonymous</code> itself? Can you run the
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program successfully after it without recompiling?</p>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>In the case you you wish to manually compile the extra programs as 64-bit code
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you may do so. Using the entry on these binaries will very likely crash the
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program or do something terribly wrong like slaughtering all the
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<a href="https://www.glyphweb.com/arda/e/elves.html">elves</a> of
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<a href="https://www.glyphweb.com/arda/i/imladris.php">Imladris</a>! :-) so please don’t do
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that :-(</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> alt</span></code></pre></div>
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<h3 id="alternate-use">Alternate use:</h3>
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<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./anonymous.ten.alt</span></span>
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<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a></span>
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<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./anonymous.bed.alt</span></span></code></pre></div>
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<h3 id="a-2023-note-about-the-warning-from-the-author">A 2023 note about the warning from the author:</h3>
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<p>The author suggested that this <em>might</em> somewhat destroy the binaries this
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touches but after the fix of 2023 this was not observed (yet?). It does indeed
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modify the files (though not all files are modified: can you figure out why that
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is?) but using them after did not result in any problems. It could be that it’s
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no longer known exactly what is supposed to happen and possibly that the
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modification might not be entirely correct for that reason though it does appear
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to be correct.</p>
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<p>It appears that the corruption happens only if the modification fails in the
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middle of doing so so that might be why it hasn’t been observed.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Is emulation the sincerest form of flattery? This small program does
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quite a lot of bit twiddling.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This program is an optimizing dynamic binary translator, allowing you to
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run x86 programs on any machine (x86 or otherwise).</p>
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<p>I have included a simple <a href="https://www.bbc.co.uk/teach/school-radio/nursery-rhymes-ten-green-bottles/zncyt39">10 Green
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Bottles</a>
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<a href="anonymous.ten.c">program</a> (try <code>make anonymous.ten</code>), meant to be compiled as a
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32-bit ELF binary.</p>
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<p>The program <code>anonymous.ten</code>, and its source (dull) are included as data
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files.</p>
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<h3 id="warning">Warning</h3>
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<p>Note that the translator screws around with the binary you run on it and <em>might</em>
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corrupt the binary to some extent and in so doing might leave any program you
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run on it unusable.</p>
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<p>The build script should give an example command to compile the program.</p>
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<h3 id="features">Features</h3>
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<p><a href="https://en.wikipedia.org/wiki/Basic_block">Basic Block</a>
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<a href="https://en.wikipedia.org/wiki/Cache_(computing)">Cache</a>: Rather than
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translating each instruction individually the dynamic binary translator
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generates a translation for an entire basic block of subject code. Having
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translated a block once, the target code generated will be stored for the
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duration that the program is running, so as a program runs its performance will
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improve, as it hits cached blocks. This can be clearly observed in the example
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program, <a href="anonymous.ten.c">anonymous.ten</a> which must be compiled as a 32-bit ELF
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binary.</p>
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<h3 id="target-library-linking">Target Library Linking:</h3>
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<p>The program runs <a href="https://en.wikipedia.org/wiki/Dynamic_linker">dynamically
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linked</a> <a href="https://en.wikipedia.org/wiki/Executable_and_Linkable_Format">ELF
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binaries</a>, and
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when the subject program attempts to make a call to a standard
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<a href="https://en.wikipedia.org/wiki/Library_(computing)">library</a>, the translator
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attempts to make an appropriate call to the native system libraries on the
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target machine. This involves mangling between different calling conventions,
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etc.</p>
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<h3 id="automatic-endian-detectionreversal">Automatic Endian Detection/Reversal:</h3>
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<p>There are various problems raised when attempting to run little
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<a href="https://en.wikipedia.org/wiki/Endianness">endian</a>
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<a href="https://en.wikipedia.org/wiki/X86">x86</a> code on a big endian chip, such as a
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<a href="https://en.wikipedia.org/wiki/PowerPC">PPC</a>. These problems are dealt
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with in a manner that is entirely transparent to the user.</p>
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<h3 id="configuration">Configuration:</h3>
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<h4 id="warnings">Warnings:</h4>
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<p>By default the build script should compile the program with a set of
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switches such that while compiling the program it generates one error
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(which I feel is useful advice). The program should generate no further
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compiler errors while it is running (yes, the program can generate
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compiler errors while it is running). If you do not wish to see this
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error, or if the program generates any further error when compiled using
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your C compiler please remove the <code>-Dwarning='-Dprocessor'</code> line and the
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<code>$$warning</code> from the compiler invocation.</p>
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<h3 id="optimization">Optimization</h3>
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<p>The build script contains a <code>-O1</code> switch for the compiler. Increasing
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the optimization level will make the program run <em>slower</em>, while
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compiling the program without any optimization will allow it to run
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<em>faster</em>.</p>
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<h3 id="obfuscation">Obfuscation</h3>
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<p>The most obvious part of the obfuscation is probably the mess of <code>#define</code>s at the
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top. This may seem a somewhat tired old obfuscation - however since many of
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these macros are (sometimes only) used by the program once it has dynamically
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recompiled itself, they are only referenced within the source code from within
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strings - and therefore the macros cannot be expanded. Furthermore, some of
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these strings of code are not given as strings, but instead are wrapped up in
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macros that use the <code>#</code> preprocessor operator to turn them into strings. In the
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hope of throwing off a few C beautifiers the macro to generate the strings is
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not contained within the source code but instead is passed in on the command
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line.</p>
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<p>Buried under all this, and the fact that the entire program is just a
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call to <code>exit(3)</code>, there are some nice subtle little obfuscations. For
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example, you may notice that there are a couple of macros that use the
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<code>##</code> preprocessor operator to build pairs of functions. One of these
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macros is used to build pairs of functions of which only one has
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local variables which shadow global variables: so one modifies the
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global state, and the other doesn’t.</p>
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<p>There is also quite a nice trick where I wave a magic wand, and a chunk of code
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which should only be run when the program is run for the first time (setting the
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<a href="https://en.wikipedia.org/wiki/Program_counter">PC / IP</a> to point at <code>main()</code>
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etc.) gets turned into a <strike>frog</strike>string. The C compiler sees a string by
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itself in the code, thinks “yup, that’s a valid C expression”, and quietly moves
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on to the next line of code.</p>
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<h3 id="limitations">Limitations</h3>
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<p>Due to space limitations only a handful of instructions are supported; these
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instructions which are supported are supported in somewhat non-conventional
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ways: chunks of the architecture (e.g. flags) are just ignored, the ELF
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<a href="https://en.wikipedia.org/wiki/Loader_(computing)">loader</a> does not really load
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the <a href="https://en.wikipedia.org/wiki/Executable_and_Linkable_Format">ELF binary</a>,
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the target <a href="https://en.wikipedia.org/wiki/Linker_(computing)">library linking</a>
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can only pass up to 3 parameters to the target library function, etc.</p>
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<p>In short, please consider this a full disclaimer for any bug that may
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turn up - yes the program is unsafe, but it’s pretty cool anyway.</p>
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<p>Despite all this, the translator is not exclusively limited to running the
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<a href="anonymous.ten.c">anonymous.ten</a> program. Other trivial <strong><em>x86</em></strong> programs may
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run on the translator - and I have successfully run a wide range of “Hello
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World” programs, including one of last year’s IOCCC entries,
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<a href="../../2000/tomx/tomx.c">tomx</a>.</p>
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<h3 id="complete-program">Complete Program</h3>
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<p>The fact that the program makes calls to <code>system(3)</code> and <code>execv(3)</code> may imply that
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it is not a complete program in its own right, as it relies on other programs.
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The call to <code>system(3)</code> is a call to ask gcc to recompile the translator with a
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new set of switches, and the call to <code>execv(3)</code> asks for the newly compiled
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program to be executed. I would point out that almost every other entry to this
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competition also require a C compiler (well, the published winning entries at any rate,
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and I recognize that a few don’t). There is little real difference between this
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program and one like last year’s entry <a href="../../2000/dhyang/dhyang.c">dhyang</a>; both are
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just C programs that generate C code as their output.</p>
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<p>Enjoy and thanks!</p>
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<!--
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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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||
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||
https://creativecommons.org/licenses/by-sa/4.0/
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||
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||
-->
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<h1 id="inventory-for-2001anonymous"><a name="inventory"></a>Inventory for 2001/anonymous</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/2001/anonymous/anonymous.c">anonymous.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/anonymous.orig.c">anonymous.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/anonymous.bed.c">anonymous.bed.c</a> - roll over song C source</li>
|
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/anonymous.ten.c">anonymous.ten.c</a> - green bottles song C source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="2001_anonymous.tar.bz2">2001_anonymous.tar.bz2</a> - download entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="index.html">index.html</a> - entry home page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/README.md">README.md</a> - markdown source for index.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/anonymous/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href=".path">.path</a> - directory path from top directory</li>
|
||
</ul>
|
||
|
||
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|
||
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||
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||
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||
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||
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||
</div>
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||
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||
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||
</div>
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||
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|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
<h2>Copyright and CC BY-SA 4.0 License</h2>
|
||
<p>This file and web page is:</p>
|
||
<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
|
||
<p>You are free to share and adapt this file under the terms of this license:</p>
|
||
<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
|
||
href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
|
||
<h2>Coda</h2>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2001%2Fanonymous%2Findex.html">Nu HTML check this web page</a></p>
|
||
<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
|
||
</div>
|
||
|
||
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||
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||
|
||
</body>
|
||
</html>
|
||
|
||
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