This directory contains the sources of the interpreters and the JIT compiler written in C++.
See a discussion of the JIT compiler here.
The original C++ version was based on the Rust version, so it has a more "ADT" style, with enums representing the various token types and expressions. Then a more traditional, OOP-style version with rutime polymorphism was added, and finally, the JIT-version based on the classes written for the OOP.
The full source of the ADT version is in brainfuck-adt.cpp
The reusable classes for the OOP version are in brainfuck.h, and the main interpreter is in brainfuck-oop.cpp
Finally, the JIT version is in brainfuck-jit.cpp.
Just run make inside this directory to build them all:
$ make CXX=g++-10
g++-10 -std=c++14 -g -O3 brainfuck-adt.cpp -o brainfuck-adt
g++-10 -std=c++14 -g -O3 brainfuck-jit.cpp -o brainfuck-jit
g++-10 -std=c++14 -g -O3 brainfuck-oop.cpp -o brainfuck-oop
Additionally, to assist in the creation of the JIT version, there's a complementary asm source used to extract the opcodes: brainfuck.s:
$ make dump
as -arch x86_64 brainfuck.s -o brainfuck.o
objdump -dS ./brainfuck.o
./brainfuck.o: file format Mach-O 64-bit x86-64
Disassembly of section __TEXT,__text:
0000000000000000 increment:
0: 48 c7 c0 01 00 00 00 movq $1, %rax
7: 01 07 addl %eax, (%rdi)
[...]
0000000000000070 break:
70: cc int3
0000000000000071 finish:
71: c3 retq