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(in-package :cl-forth)
(defparameter *operations* (make-hash-table :test 'equal))
(eval-always
(defun normalize-op-list (asm-list)
(cons 'list
(mapcar (lambda (el) (cond ((stringp el) el)
((listp el) `(format nil ,@el))))
asm-list)))
(defun defop-format (str space-num asm-list)
(format str
(format nil "~~{~a~~a~~%~~}"
(make-string space-num :initial-element #\Space))
asm-list))
(defun replace-write (out-stream indent forms)
(if (consp forms)
(if (eq :write (car forms))
`(defop-format ,out-stream ,indent
,(normalize-op-list (cdr forms)))
(cons (replace-write out-stream indent (car forms))
(replace-write out-stream indent (cdr forms))))
forms)))
(defmacro defop (op-name+args (&key (indent 4)) &body body)
(with-gensyms (out-stream)
(destructuring-bind (op-name . args) (mklist op-name+args)
`(setf (gethash ,(string op-name) *operations*)
(lambda (,out-stream ,@args)
,(if (or (stringp (car body)) (stringp (caar body)))
`(defop-format ,out-stream ,indent
,(normalize-op-list body))
(replace-write out-stream indent (car body))))))))
;;; TODO: Turn stack operation comments to DEFOP option,
;;; which then can be used by the user as a documentation
;;; TODO: Better yet, generate the asm code directly from
;;; the stack op documentation (this seems easily doable)
;; ( -- a)
(defop (push a) ()
("push ~d" a))
;; (rbx rax -- (rbx + rax))
(defop + ()
"pop rax"
"pop rbx"
"add rax, rbx"
"push rax")
;; (rbx rax -- (rbx - rax))
(defop - ()
"pop rax"
"pop rbx"
"sub rbx, rax"
"push rbx")
(defop dump ()
"pop rdi"
"call dump")
(defop = ()
"mov rcx, 0"
"mov rdx, 1"
"pop rax"
"pop rbx"
"cmp rax, rbx"
"cmove rcx, rdx"
"push rcx")
(defop (exit code) ()
"mov rax, 60"
("mov rdi, ~a" code)
"syscall")
(defop (ise label-num) ()
"pop rax"
"test rax, rax"
("jz et_~a" label-num))
(defop (yoksa yap-num ise-num) (:indent 0)
(" jmp et_~a" yap-num)
("et_~a:" ise-num))
(defop (yap label-num &optional döngü-num) (:indent 0)
(if (null döngü-num)
(:write ("et_~a:" label-num))
(:write (" jmp et_~a" döngü-num)
("et_~a:" label-num))))
;; (rax -- rax rax)
(defop eş ()
"pop rax"
"push rax"
"push rax")
;; (rax -- )
(defop düş ()
"pop rax")
(defop (iken label-num) ()
"pop rax"
"test rax, rax"
("jz et_~a" label-num))
(defop (döngü label-num) (:indent 0)
("et_~a:" label-num))
(defop < ()
"mov rcx, 0"
"mov rdx, 1"
"pop rbx"
"pop rax"
"cmp rax, rbx"
"cmovl rcx, rdx"
"push rcx")
(defop > ()
"mov rcx, 0"
"mov rdx, 1"
"pop rbx"
"pop rax"
"cmp rax, rbx"
"cmovg rcx, rdx"
"push rcx")
(defop bel ()
"push bel")
(defop oku ()
"pop rax"
"xor rbx, rbx"
"mov bl, [rax]"
"push rbx")
(defop yaz ()
"pop rbx"
"pop rax"
"mov [rax], bl")
(defop (syscall num) ()
(iter (with call-regs = #("rdi" "rsi" "rdx" "r10" "r8" "r9"))
(initially (:write "pop rax"))
(for i from (- num 1) downto 0)
(:write ("pop ~a" (aref call-regs i)))
(finally (:write "syscall"))))
(defun gen-header (op str)
(format str " ;; -- ~s --~%" op))
(defun gen-code (op str)
(let ((op-fn (gethash (string (car op)) *operations*)))
(if (null op-fn)
(error "~s is not a valid op" op)
(apply op-fn str (cdr op)))))
(defun gen-dump (str)
(format str "~{~a~%~}"
'("dump:"
" mov r9, -3689348814741910323"
" sub rsp, 40"
" mov BYTE [rsp+31], 10"
" lea rcx, [rsp+30]"
".L2:"
" mov rax, rdi"
" lea r8, [rsp+32]"
" mul r9"
" mov rax, rdi"
" sub r8, rcx"
" shr rdx, 3"
" lea rsi, [rdx+rdx*4]"
" add rsi, rsi"
" sub rax, rsi"
" add eax, 48"
" mov BYTE [rcx], al"
" mov rax, rdi"
" mov rdi, rdx"
" mov rdx, rcx"
" sub rcx, 1"
" cmp rax, 9"
" ja .L2"
" lea rax, [rsp+32]"
" mov edi, 1"
" sub rdx, rax"
" xor eax, eax"
" lea rsi, [rsp+32+rdx]"
" mov rdx, r8"
" mov rax, 1"
" syscall"
" add rsp, 40"
" ret")))
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