A disassembler for JITed functions in Racket.
To install:
% raco pkg install disassemble
To use it, try something like this:
[samth@punge:~/sw/disassemble (master) plt] racket
Welcome to Racket v6.0.1.10.
> (require disassemble)
> (define (f x) 1)
> (disassemble f)
0: 488943f8 (mov (mem64+ rbx #x-8) rax)
4: 4883c3f8 (add rbx #xfffffffffffffff8)
8: b803000000 (mov eax #x3)
d: 4c8b75c8 (mov r14 (mem64+ rbp #x-38))
11: 4883c428 (add rsp #x28)
15: 415d (pop r13)
17: 415c (pop r12)
19: 5b (pop rbx)
1a: 5d (pop rbp)
1b: c3 (ret)
>
If you have ndisasm installed (and in your PATH) you can also try:
> (disassemble f #:program 'nasm)
00000000 488943F8 mov [rbx-0x8],rax
00000004 4883C3F8 add rbx,byte -0x8
00000008 B803000000 mov eax,0x3
0000000D 4C8B75C8 mov r14,[rbp-0x38]
00000011 4883C428 add rsp,byte +0x28
00000015 415D pop r13
00000017 415C pop r12
00000019 5B pop rbx
0000001A 5D pop rbp
0000001B C3 ret
This works only on x86 or x86-64.
Also, the dump function writes the bytes of the machine code to a
file:
> (dump const "file.bin")
Patches, uses, complaints, and suggestions are all welcome.
The disassembly code (when not using NASM) is taken from Gรถran Weinholt's Machine Code library.