(apply printf s)
(display "\n")))
+(define wordsize 8)
+
+(define (type-size type env)
+
+ (define (adt-size adt)
+ (let ([sizes
+ (map (lambda (sum)
+ (fold-left (lambda (acc x) (+ acc (type-size x)))
+ wordsize ; one word needed to store tag
+ (cdr sum)))
+ (cdr adt))])
+ (apply max sizes)))
+
+ (case type
+ ['Int wordsize]
+ ['Bool wordsize]
+ [else
+ (let ([adt (assoc type (env-adts env))])
+ (if adt
+ (adt-size adt)
+ (error #f "unknown size" type)))]))
+
+ ; an environment consists of adt layouts in scope,
+ ; and any bound variables.
+ ; bound variables are an assoc list with their stack offset
+(define make-env list)
+(define env-adts car)
+(define env-bindings cadr)
+
(define (codegen-add xs si env)
(define (go ys)
(if (null? ys)
('linux (emit "mov $1, %rax"))) ; syscall 1 (write)
(emit "syscall"))
-(define wordsize 8)
-
(define (codegen-let bindings body si env)
; is this a closure that captures itself?
(and (eqv? (ast-type expr) 'closure)
(memv name (caddr expr))))
- (let* ((stack-offsets (map (lambda (name x) ; assoc map of binding name to offset
+
+ ;; (define (emit-scc scc env)
+ ;; ; acc is a pair of the env and list of touchups
+ ;; (define (emit-binding acc binding)
+ ;; (let ([binding-name (car binding)]
+ ;; [binding-body (cadr binding)]
+
+ ;; [other-bindings (filter
+ ;; (lambda (x) (not (eqv? binding-name x)))
+ ;; scc)]
+ ;; [mutually-recursives
+ ;; (filter
+ ;; (lambda (other-binding)
+ ;; (memv other-binding (references binding-body)))
+ ;; other-bindings)]
+
+ ;; [new-touchups (append touchups (cdr acc))])
+
+ ;; ; TODO: assert that the only mutually recursives are closures
+ ;; (for-each
+ ;; (lambda (binding)
+ ;; (when (not (eqv? (ast-type (cadr binding))
+
+ ;; (emit "asdf")
+ ;; (cons new-env new-touchups)
+ ;; ))
+
+ ;; (fold-left emit-binding (cons env '()) scc))))
+
+ (let* ([stack-offsets (map (lambda (name x) ; assoc map of binding name to offset
(cons name (- si (* x wordsize))))
(map car bindings)
- (range 0 (length bindings))))
- (inner-si (- si (* (length bindings) wordsize)))
+ (range 0 (length bindings)))]
+ [inner-si (- si (* (length bindings) wordsize))]
- (get-offset (lambda (n) (cdr (assoc n stack-offsets))))
+ [get-offset (lambda (n) (cdr (assoc n stack-offsets)))]
[inner-env
(fold-left
(lambda (env comps)
- (let ([scc-env
+ (let* ([scc-binding-offsets
(fold-left
(lambda (acc name)
(cons (cons name (get-offset name))
acc))
- env
- comps)])
+ (env-bindings env)
+ comps)]
+ [scc-env (make-env (env-adts env) scc-binding-offsets)])
(for-each
(lambda (name)
(let ([expr (cadr (assoc name bindings))])
; codegen-closure realise this!
(codegen-expr expr
inner-si
+ (make-env
+ (env-adts scc-env)
(cons (cons name 'self-captive)
- scc-env))
+ (env-bindings scc-env))))
(codegen-expr expr inner-si scc-env))
(emit "movq %rax, ~a(%rbp)" (get-offset name))))
comps)
scc-env))
- env (reverse (sccs (graph bindings))))])
+ env
+ (reverse (sccs (graph bindings))))])
(for-each (lambda (form)
(codegen-expr form inner-si inner-env))
body)))
(define (codegen-var name si env)
- (when (not (assoc name env))
- (error #f (format "Variable ~a is not bound" name)))
- (let ((offset (cdr (assoc name env))))
- (emit "movq ~a(%rbp), %rax" offset)))
+ (let ([binding (assoc name (env-bindings env))])
+ (if (not binding)
+ (error #f (format "Variable ~a is not bound" name))
+ (emit "movq ~a(%rbp), %rax" (cdr binding)))))
(define cur-lambda 0)
(define (fresh-lambda)
; store the captured vars
(for-each
(lambda (var-name heap-offset)
- (let ([stack-offset (cdr (assoc var-name env))])
+ (let ([stack-offset (cdr (assoc var-name (env-bindings env)))])
(emit "### captive ~a" var-name)
(if (eqv? stack-offset 'self-captive)
; captive refers to this closure:
(* (- wordsize) (+ 1 i)))
(range 0 (length params))))
- (env (map cons params stack-offsets)))
+ [bindings (map cons params stack-offsets)]
+ [env (make-env '() bindings)])
(emit "~a:" label)
(display "## lambda captives: ")
(codegen-expr else si env)
(emit "~a:" exit-label)))
+(define (data-tor env e)
+ (and (list? e)
+ (assoc (car e) (flat-map data-tors (env-adts env)))))
+
+(define (codegen-data-tor e si env)
+
+ (define (codegen-destructor tor)
+ (codegen-expr (cadr e) si env)
+ (let ([index (cadr tor)]
+ [products 2]
+ [to-traverse (list-head products index)]
+ [offset (fold-left
+ (lambda (acc t) (+ acc (type-size t)))
+ wordsize ; skip tag in first word
+ to-traverse)])
+ 3
+ ))
+
+ (let ([tor (data-tor env e)]
+ [constructor (eqv? 'constructor (cadr tor))])
+ (if constructor
+ (codegen-constructor tor)
+ (codegen-destructor tor))))
+
(define (codegen-expr e si env)
(emit "# ~a" e)
(case (ast-type e)
('= (codegen-eq (cadr e) (caddr e) si env))
('bool->int (codegen-expr (cadr e) si env))
('print (codegen-print (cadr e) si env))
- (else (codegen-call (car e) (cdr e) si env))))
+ (else
+ (if (data-tor env e)
+ (codegen-data-tor e si env)
+ (codegen-call (car e) (cdr e) si env)))))
; this is a builtin being passed around as a variable
('builtin (emit "movq $~a, %rax" (builtin-id e)))
(emit "~a:" (car s))
(emit "\t.string \"~a\"" (cdr s)))
-;; (define (amd64-abi f)
-;; ; preserve registers
-;; (emit "push %rbp")
-;; ;; (emit "push %rbx")
-;; ;; (for-each (lambda (i)
-;; ;; (emit (string-append
-;; ;; "push %r"
-;; ;; (number->string i))))
-;; ;; '(12 13 14 15))
-
-;; (emit "movq %rsp, %rbp") ; set up the base pointer
-
-;; (f) ; call stuff
-;; ; restore preserved registers
-;; ;; (for-each (lambda (i)
-;; ;; (emit (string-append
-;; ;; "pop %r"
-;; ;; (number->string i))))
-;; ;; '(15 14 13 12))
-;; ;; (emit "pop %rbx")
-;; (emit "pop %rbp")
-;; (emit "ret"))
-
; 24(%rbp) mem arg 1
; 16(%rbp) mem arg 0 prev frame
; -----------------------
(set! cur-lambda 0)
(let* ([body (program-body program)]
+ [data-layouts (map data-layout (program-datas program))]
+
(extract-res-0 (extract-strings body))
(strings (car extract-res-0))
(extract-res-1 (extract-lambdas (cdr extract-res-0)))
(emit "movq %rsp, %rbp") ; set up the base pointer
- (codegen-expr xform-prog (- wordsize) '())
+ (codegen-expr xform-prog (- wordsize) (make-env data-layouts '()))
; exit syscall
(emit "mov %rax, %rdi")
projects / scheme.git / blobdiff