c4 - C in four functions

An exercise in minimalism.

Try the following:

gcc -o c4 c4.c
./c4 hello.c
./c4 -s hello.c

./c4 c4.c hello.c
./c4 c4.c c4.c hello.c

Modifications

This is a fork of rswier/c4 with the following modifications:

1. Added an option -b to dump the bytecode in a textual format.
2. Added an option -p to make char, int and pointers the same size in the bytecode (1)
3. Made the bytecode format relocatable so that it can be loaded at any address.

The c4.sh POSIX shell script implements a virtual machine to run the C4 bytecode.

Try the following:

./c4 -b fib.c > fib.op
./c4.sh fib.op

You'll notice that it's not very fast!

Still, the virtual machine is performant enough to bootstrap C4:

./c4 -b -p c4.c > c4.op                         # Generate portable C4 bytecode for c4.c
./c4.sh --no-exit c4.op -b -p c4.c > c4-2.op    # Compile c4.c using c4.op with c4.sh VM
./c4.sh --no-exit c4-2.op -b -p c4.c > c4-3.op  # Compile c4.c using c4-2.op with c4.sh VM
diff c4-2.op c4-3.op                            # Should be empty