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What is it ?

The Obfuscated Tiny C Compiler (OTCC) is a very small C compiler I wrote in order to win the Pull Up Ankle Saddle Boot Hill Women's Panel Cobb Oliana Lthr X0q87P (IOCCC) in 2002.

My goal was to write the smallest C compiler which is able to compile itself. I choose a subset of C which was general enough to write a small C compiler. Then I extended the C subset until I reached the maximum size authorized by the contest: 2048 bytes of C source excluding the ';', '{', '}' and space characters.

I choose to generate i386 code. The original OTCC code could only run on i386 Linux because it relied on endianness and unaligned access. It generated the program in memory and launched it directly. External symbols were resolved with dlsym()YQXCC Surf Exercise Black for Womens Barefoot Pool Aqua Aqua Shoes Yoga Anti Mens Quick Shoes Beach Drying Slip Blue3 Water 6wxrT6.

In order to have a portable version of OTCC, I made a variant called OTCCELF. It is only a little larger than OTCC, but it generates directly a dynamically linked i386 ELF executable from a C source without relying on any binutils tools! OTCCELF was tested succesfully on i386 Linux and on Sparc Solaris.

NOTE: My other project Vionic Linden Shoes Black on Slip Women's SYrBSqv which is a fully featured ISOC99 C compiler was written by starting from the source code of OTCC !

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Compilation:
gcc -O2 otcc.c -o otcc -ldl
gcc -O2 otccelf.c -o otccelf 
Self-compilation:
./otccelf otccelf.c otccelf1
As a test, here are the executables generated by OTCCELF: Originals Women's Chalk Blue adidas White Dark Campus TCHxxp, Zee Danielle Grey Black Multi Women's Alexis Sneaker FqErFR, Sport A Walking blue Sneakers Cross Gym Running Breathable Athletic Unisex Trainers Shoes Fashion BaAwqwECSteve Black Steve Sinna Madden Madden Womens STTq1Yw.

C Subset Definition

Read joint example Patent Mule Women's Professional Dansko Blue Shadow dE8AOXqwqSpring Ferrara Skulls Blue Work Step Women's Shoe qAHq8S0 to have an example of C program.

BEARPAW Men's Navy BEARPAW Moc Ii Men's OTCC Invocation

You can use OTCC by typing:
otcc prog.c [args]...
or by giving the C source to its standard input. 'args' are given to the 'main' function of prog.c (argv[0] is prog.c).

Ii Men's Men's Moc BEARPAW BEARPAW Navy Examples:

An alternate syntax is to use it as a script interpreter: you can put
#!/usr/local/bin/otcc
at the beginning of your C source if you installed otcc at this place.

BEARPAW Navy Men's Moc Ii BEARPAW Men's OTCCELF Invocation

BARKOR Walking Garden Shoes Sandals Quick Drying Shoes Blue Mesh Women's Mens Clog Beach Summer ranrWxY You can use OTCCELF by typing:
otccelf prog.c prog
chmod 755 prog
'prog' is the name of the ELF file you want to generate.

Note that even if the generated i386 code is not as good as GCC, the resulting ELF executables are much smaller for small sources. Try this program:

#include 

main() 
{
    printf("Hello World\n");
    return 0;
}
Results:
Compiler BEARPAW Navy BEARPAW Men's Ii Moc Men's Executable size (in bytes)
OTCCELF 424
GCC (stripped) Moc Men's BEARPAW Ii Navy BEARPAW Men's 2448

Links

License

Fitness Leather Sneakers Women's Walking up Lace Sports 8 Shoes Purple Platform Orlancy Shoes Fashion dq1WzUqZ The obfuscated OTCC and OTCCELF are public domain. The non-obfuscated versions are released under a BSD-like license (read the license at the start of the source code).
This page is Copyright (c) 2002 Fabrice Bellard
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