brafsm - simple brainfuck compiler that uses FASM assembly.
- Compiles any valid brainfuck program to native x86_64 executable
- Brafsm treats every character except for valid bf operatos as comment. So you can write code like this:
++++++++ Set Cell #0 to 8
[
>++++ Add 4 to Cell #1; this will always set Cell #1 to 4
[ as the cell will be cleared by the loop
>++ Add 2 to Cell #2
>+++ Add 3 to Cell #3
>+++ Add 3 to Cell #4
>+ Add 1 to Cell #5
<<<<- Decrement the loop counter in Cell #1
] Loop until Cell #1 is zero; number of iterations is 4
>+ Add 1 to Cell #2
>+ Add 1 to Cell #3
>- Subtract 1 from Cell #4
>>+ Add 1 to Cell #6
[<] Move back to the first zero cell you find; this will
be Cell #1 which was cleared by the previous loop
<- Decrement the loop Counter in Cell #0
] Loop until Cell #0 is zero; number of iterations is 8
The result of this is:
Cell no : 0 1 2 3 4 5 6
Contents: 0 0 72 104 88 32 8
Pointer : ^
>>. Cell #2 has value 72 which is 'H'
>---. Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++. Likewise for 'llo' from Cell #3
>>. Cell #5 is 32 for the space
<-. Subtract 1 from Cell #4 for 87 to give a 'W'
<. Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------. Cell #3 for 'rl' and 'd'
>>+. Add 1 to Cell #5 gives us an exclamation point
>++. And finally a newline from Cell #6
- Tape size is 1024 in both sides
- For now brafsm avaliable only for Linux
You need to have FASM installed on your system. Here is example for Arch Linux
sudo pacman -S fasm
Then you need to build brafsm
git clone https://github.com/m4kyu/brafsm.git
make
sudo make install
Hello world
brafsm examples/hello.bf
You can specify output file name like this
brafsm examples/hello.bf hello
If you want to preserve generated assembly you can use -p flag
brafsm examples/hello.bf -p
For more options use --help