This is a very simple Brainfuck compiler, targetting X86-64 machine with libc available.
Full language specification could be obtained from: https://en.wikipedia.org/wiki/Brainfuck
Memory is allocated through calloc and total size allocated
and zeroed is 30,000 bytes. No boundary check is embeded and
undefined behaviour will happen if reading beyond boundaries
(most likely wrong calculation result or segfault will happen).
Eventhough it is not strictly necessary for a simple language like this, this compiler still have regular components like lexer, parser, ast, ir, abstract asm, etc.
Same type of operation is folded at parse time (e.g. ++++ is
folded to Arith(+4)) to reduce generated code size. Unsupported
characters are automatically skipped by the lexer.
Function prologue and epilogue are hard-coded in X86-64 assembly.
Output assembly file is in AT&T syntax for GAS to assemble. The
compiler also calls cc to assemble the generated assembly and
link it with libc.
The compiler does not have a argument parser and it only accept one argument, the input file:
cargo run -- sample/hello_world.bf