marcelgarus / c1c

C1 compiler

c1c

A compiler for .c1 files - they're just regular C files, except array indexes start at 1.

Motivation

Do you ever feel the need to torture a software engineer? The c1 programming language is the perfect fit for you!

How to install

Just download c1c and add it to your path. There's a linux executable in the repo, or you can build the compiler from source (c1c.c).

Note: You need to have gcc installed for the compiler to work.

Usage

Just execute c1c test.c1 to compile the given file to an executable.

Options

There's the option to provide a custom start index for arrays using the --start-index option. It's not limited to integer values, so you can even let your arrays start at 0.5 or pi. How awesome is that!

Warning: Almost all array start indexes are permitted, except 0. Because that would be crazy. Also, your indexes are casted to ints.

Examples

Here's a simple program that's supposed to be compiled using an array start index of 1:

#include <stdio.h>

int main(void) {
  int a[] = { 2, 3, 1 };
  printf("Element is %d.\n", a[a[3]]);
}

Output with array start of 1: Element is 2.

Output with array start of 2: Element is 3.

You can find the file in the repo as test.c1.

---

Disclaimer: Do not use this compiler in a production environment. In fact, just don't use it at all. I do not support array indexes starting at 1. Of course, pi is the only correct start index.

c1c's Issues

c1c crashes with error "free(): invalid next size (fast): 0x00007fffd618e7d0"

I tried compiling the test.c1 program from the repository and c1c crashed with the following backtrace:

*** Error in `./c1c': free(): invalid next size (fast): 0x00007fffd618e7d0 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x70bfb)[0x7f943d8d0bfb]
/lib/x86_64-linux-gnu/libc.so.6(+0x76fc6)[0x7f943d8d6fc6]
/lib/x86_64-linux-gnu/libc.so.6(+0x7780e)[0x7f943d8d780e]
./c1c(+0x122e)[0x7f943e00122e]
./c1c(+0xfc6)[0x7f943e000fc6]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f943d8802e1]
./c1c(+0xaba)[0x7f943e000aba]
======= Memory map: ========
7f9438000000-7f9438021000 rw-p 00000000 00:00 0
7f9438021000-7f943c000000 ---p 00000000 00:00 0
7f943d640000-7f943d656000 r-xp 00000000 00:00 534852             /lib/x86_64-linux-gnu/libgcc_s.so.1
7f943d656000-7f943d657000 ---p 00016000 00:00 534852             /lib/x86_64-linux-gnu/libgcc_s.so.1
7f943d657000-7f943d855000 ---p 00000017 00:00 534852             /lib/x86_64-linux-gnu/libgcc_s.so.1
7f943d855000-7f943d856000 r--p 00015000 00:00 534852             /lib/x86_64-linux-gnu/libgcc_s.so.1
7f943d856000-7f943d857000 rw-p 00016000 00:00 534852             /lib/x86_64-linux-gnu/libgcc_s.so.1
7f943d860000-7f943d9f5000 r-xp 00000000 00:00 534827             /lib/x86_64-linux-gnu/libc-2.24.so
7f943d9f5000-7f943d9fd000 ---p 00195000 00:00 534827             /lib/x86_64-linux-gnu/libc-2.24.so
7f943d9fd000-7f943dbf5000 ---p 0000019d 00:00 534827             /lib/x86_64-linux-gnu/libc-2.24.so
7f943dbf5000-7f943dbf9000 r--p 00195000 00:00 534827             /lib/x86_64-linux-gnu/libc-2.24.so
7f943dbf9000-7f943dbfb000 rw-p 00199000 00:00 534827             /lib/x86_64-linux-gnu/libc-2.24.so
7f943dbfb000-7f943dbff000 rw-p 00000000 00:00 0
7f943dc00000-7f943dc22000 r-xp 00000000 00:00 534805             /lib/x86_64-linux-gnu/ld-2.24.so
7f943dc22000-7f943dc23000 r-xp 00022000 00:00 534805             /lib/x86_64-linux-gnu/ld-2.24.so
7f943de23000-7f943de24000 r--p 00023000 00:00 534805             /lib/x86_64-linux-gnu/ld-2.24.so
7f943de24000-7f943de25000 rw-p 00024000 00:00 534805             /lib/x86_64-linux-gnu/ld-2.24.so
7f943de25000-7f943de26000 rw-p 00000000 00:00 0
7f943df00000-7f943df02000 rw-p 00000000 00:00 0
7f943df10000-7f943df11000 rw-p 00000000 00:00 0
7f943df20000-7f943df23000 rw-p 00000000 00:00 0
7f943e000000-7f943e001000 r-xp 00000000 00:00 1446759            /home/clemens/c1c/c1c
7f943e001000-7f943e002000 r-xp 00001000 00:00 1446759            /home/clemens/c1c/c1c
7f943e201000-7f943e202000 r--p 00001000 00:00 1446759            /home/clemens/c1c/c1c
7f943e202000-7f943e203000 rw-p 00002000 00:00 1446759            /home/clemens/c1c/c1c
7fffd618e000-7fffd61af000 rw-p 00000000 00:00 0                  [heap]
7fffdccbd000-7fffdd4bd000 rw-p 00000000 00:00 0                  [stack]
7fffdda28000-7fffdda29000 r-xp 00000000 00:00 0                  [vdso]
Aborted (core dumped)

I am using GCC 6.3.0 on WSL (Debian).

Use default C compiler

Support custom step sizes

It would be nice to be able to configure custom step sizes.
For example, one might want to access array elements like this:

int a[] = { 1, 2, 3 };
printf("%d %d %d", a[2.1], a[2.2], a[2.3]);
// Expected output: 1 2 3

Check for comments in empty brackets

One might initialize an array like this:

int a[/*hey*/] = { 1, 2 };

The compiler currently does not support this.

Add support for multiple files

Support only creating intermediary C code