(inner-si (- si (* (length bindings) wordsize)))
(names (map car bindings))
(exprs (map cadr bindings))
- (inner-env (append (map cons names stack-offsets) env)))
- (for-each (lambda (expr offset)
+
+ ; recursive let bindings: build environment as we go
+ (inner-env (fold-left
+ (lambda (env name expr offset)
(codegen-expr expr inner-si env)
- (emit "movq %rax, ~a(%rsp)" offset))
- exprs stack-offsets)
- (for-each (lambda (form) (codegen-expr form inner-si inner-env)) body)))
+ (emit "movq %rax, ~a(%rsp)" offset)
+ (cons (cons name offset) env))
+ env names exprs stack-offsets)))
+ (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(%rsp), %rax" offset)))
)))) ; move args and capture vars to stack
(define (codegen-expr e si env)
- (cond ((builtin? e) e)
- ((closure? e) e)
-
- ((app? e)
+ (case (ast-type e)
+ ('builtin e)
+ ('closure e)
+ ('app
(let ((callee (codegen-expr (car e) si env)))
(case callee
('+ (codegen-add (cdr e) si env))
('bool->int (codegen-expr (cadr e) si env))
(else (codegen-call callee (cdr e) si env)))))
- ((let? e) (codegen-let
- (let-bindings e)
+ ('let (codegen-let (let-bindings e)
(let-body e)
si
env))
- ((var? e) (codegen-var e si env))
- ((boolean? e) (emit "movq $~a, %rax" (if e 1 0)))
- (else (emit "movq $~a, %rax" e))))
+
+ ('var (codegen-var e si env))
+
+ ('string-literal (emit "movq ~a, %rax" label))
+ ('bool-literal (emit "movq $~a, %rax" (if e 1 0)))
+ ('int-literal (emit "movq $~a, %rax" e))
+
+ (else (error #f "don't know how to codegen this"))))
+
(define (fold-map f x) (fold-left append '() (map f x)))
(define (free-vars prog)
(define bound '())
(define (collect e)
- (cond
- ((builtin? e) '()) ; do nothing
- ((var? e) (if (memq e bound) '() (list e)))
- ((lambda? e)
+ (case (ast-type e)
+ ('builtin '()) ; do nothing
+ ('var (if (memq e bound) '() (list e)))
+ ('lambda
(set! bound (append (lambda-args e) bound))
(collect (lambda-body e)))
- ((app? e) (fold-map collect e))
- ((let? e)
+ ('app (fold-map collect e))
+ ('let
(let ((bind-fvs (fold-map (lambda (a)
((set! bound (cons (car a) bound))
(collect (cdr a))))
(else '())))
(collect prog))
-(define (closure? e)
- (and (list? e) (eqv? (car e) 'closure)))
-
; ((lambda (x) (+ x 1)) 42) => {lambda0: (x) (+ x 1)}, (@lambda0 42)
(define (extract-lambdas program)
(define lambdas '())
(set! lambdas (cons new-lambda lambdas))
`(closure ,label ,captured))) ; todo: should we string->symbol?
(define (extract e)
- (cond
- ((lambda? e) (add-lambda e))
- ((let? e) `(let
+ (case (ast-type e)
+ ('lambda (add-lambda e))
+ ('let `(let
,(map extract (let-bindings e))
,@(map extract (let-body e))))
- ((app? e) (append (list (extract (car e)))
+ ('app (append (list (extract (car e)))
(map extract (cdr e))))
(else e)))
(let ((transformed (extract program)))
(cons lambdas transformed)))
+;(define (extract-strings program))
+
(define (amd64-abi f)
; preserve registers
(emit "push %rbp")
(else (error #f "need to test out the below"))
(else (format "~a(%rsp)" (- n 6)))))
-
-
(define (codegen program)
(let* ((extract-result (extract-lambdas program))
(lambdas (car extract-result))
(amd64-abi
(lambda () (codegen-expr xform-prog 0 '())))))
-(define (compile-to-binary program)
+(define (compile-to-binary program output)
(when (not (eq? (typecheck program) 'int)) (error #f "not an int"))
(let ([tmp-path "/tmp/a.s"])
(when (file-exists? tmp-path) (delete-file tmp-path))
(with-output-to-file tmp-path
(lambda () (codegen program)))
- (system "clang -fomit-frame-pointer /tmp/a.s rts.c")))
+ (system (format "clang -fomit-frame-pointer /tmp/a.s rts.c -o ~a" output))))