bf

An optimizing brainf*ck interpreter written in C.

Usage

usage: bf [-e eof_value] [-t tape_size] [-bcfhpv] file
    -e eof_value: integer value of EOF (omit option to leave cell unchanged)
    -t tape_size: length of tape (default: 30000)
    -b: enable bounds checking
    -c: enable circular tape (implies -b)
    -f: enable infinite tape (implies -b)
    -h: print this help
    -p: print minified code to stdout instead of running it
    -v: show verbose messages

Program input is taken from stdin and output on stdout.

Build

make

Optimizations

• Recognizes simple loops to set current cell to 0 ([-], [+])
• Lumps sequences of +/-, </>, [/] into one instruction
• Compute jumps ahead of time
• Skips loops that cannot be entered

Known Issues

• Some constructs are not fully optimized e.g. +[.[-]]+[-] optimizes to +[.[-]][-] and not +[.[-]] (but shouldn't ever appear in well-written code ;) )