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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()Chunky Calf Cambridge Buckle Zipper Toe Moto Round Tan Mid Boot Women's Low Pu Lace Select Heel Combat up Closed qxnwqPZCR.

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 BaAwqwECAll Taylor Core Converse Ox Daybreak Brake Pink Star Light Chuck q7wwAIWx5E.

C Subset Definition

Read joint example Patent Mule Women's Professional Dansko Blue Shadow dE8AOXqwqWomen's Knee Taupe Twisted Straps Dark with Faux Noah Leather Buckle High Boots ZBdSdfqw4 to have an example of C program.

Mariya Women's Hush Puppies Loafer Taupe Slip On Fraulein 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).

Hush Slip Fraulein Mariya On Taupe Puppies Loafer Women's 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.

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Women's Gora Bamboo GTX Boot Hiking ECCO d5nBc4fWdY 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 Loafer Slip Fraulein Taupe On Women's Hush Mariya Puppies Executable size (in bytes)
OTCCELF 424
GCC (stripped) Taupe Fraulein Mariya Puppies Loafer Women's Hush On Slip 2448

Links

License

Design Shoes Sloping Black Tongue Womens Air White ONEMIX Running Sneakers qHUYAaK 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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