Tarpit is a rather naive brainf*** compiler for Linux. It produces a 32-bit x86 ELF-formatted executable given a valid brainf*** program.
Usage: tarpit <source> [<output>]
You should be able to compile Tarpit itself just by running make. If you want to compile the programs in the examples directory also, do "make examples".
Both of the example programs were taken from the Wikipedia article.
The pointer to the current cell is stored in the EAX register. For the read and write operations, it is moved to ECX to be passed to the read(2) and write(2) syscalls, then moved back to EAX, so it never has to be stored in memory.
All cell addition and subtraction is done in-memory, without moving it to a register first.
For <, >, +, and - tokens, multiple consecutive instances of the same token are condensed down to a single ADD or SUB instruction. For cells, the number is treated as modulo 256 (i.e. it overflows). This means that 257 sequential + tokens and a single + token are considered equivalent and generate the same instruction.
Sequential reads and writes are not optimized in any way, so two consecutive writes would still tear down the syscall and set it up again in between.
, is implemented as a call to read(2) on stdin (fd 0) using 1 character.
The looping instructions [ and ] are each implemented as a combination of a CMP and either a JE or JNE instruction. Both of them are implemented as conditional jumps. The target of the jump is the instruction after the corresponding JE or JNE instruction.
Copyright (c) 2012 Jonathan David Page
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