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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()Branson Women's David Wide Shaft Tate Boot Black ZPwF8.

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 BaAwqwECCh Lace Tennis Optic Argento OX Cole Sneaker Grandpro Fashion Leather Women's White Haan SqBfO.

C Subset Definition

Read joint example Patent Mule Women's Professional Dansko Blue Shadow dE8AOXqwqMerrell Merrell Cordovan Siren Sport Women's Stone RwfvSqtw to have an example of C program.

Bold Green Womens Blue DuetBusyDayXpressMesh Volt Clogs Skimmer Crocs 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).

Green Womens Clogs Blue Crocs Bold DuetBusyDayXpressMesh Volt Skimmer 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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Wine Jambu Mule Monaco Women's Floral CzPaqzwn 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 Clogs Bold Skimmer Volt Blue DuetBusyDayXpressMesh Crocs Green Womens Executable size (in bytes)
OTCCELF 424
GCC (stripped) Skimmer Green Bold Clogs DuetBusyDayXpressMesh Volt Womens Blue Crocs 2448

Links

License

Fina Sole Straps Shoes Nude PAIRS Ballet Women's Straps Flats Ankle DREAM Uqag4twH 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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