(define (codegen-add xs si env)
(define (go ys)
(if (null? ys)
- (emit "movq ~a(%rsp), %rax" si)
+ (emit "movq ~a(%rbp), %rax" si)
(begin
(let ((y (car ys)))
(if (integer? y)
- (emit "addq $~a, ~a(%rsp)" y si)
+ (emit "addq $~a, ~a(%rbp)" y si)
(begin
(codegen-expr y (- si wordsize) env)
- (emit "addq %rax, ~a(%rsp)" si))))
+ (emit "addq %rax, ~a(%rbp)" si))))
(go (cdr ys)))))
(begin
- ; use si(%rsp) as the accumulator
- (emit "movq $0, ~a(%rsp)" si)
+ ; use si(%rbp) as the accumulator
+ (emit "movq $0, ~a(%rbp)" si)
(go xs)))
(define (codegen-binop opcode)
(lambda (a b si env)
(codegen-expr b si env)
- (emit "movq %rax, ~a(%rsp)" si)
+ (emit "movq %rax, ~a(%rbp)" si)
(codegen-expr a (- si wordsize) env)
- (emit "~a ~a(%rsp), %rax" opcode si)))
+ (emit "~a ~a(%rbp), %rax" opcode si)))
(define codegen-sub (codegen-binop "sub"))
+
(define codegen-mul (codegen-binop "imul"))
(define (codegen-not x si env)
(define (codegen-eq a b si env)
(codegen-expr a si env)
- (emit "movq %rax, ~a(%rsp)" si)
+ (emit "movq %rax, ~a(%rbp)" si)
(codegen-expr b (- si wordsize) env)
- (emit "subq ~a(%rsp), %rax" si)
+ (emit "subq ~a(%rbp), %rax" si)
(emit "not %rax")
(emit "andq $1, %rax"))
(inner-env (fold-left
(lambda (env name expr offset)
(codegen-expr expr inner-si env)
- (emit "movq %rax, ~a(%rsp)" offset)
+ (emit "movq %rax, ~a(%rbp)" offset)
(cons (cons name offset) env))
env names exprs stack-offsets)))
(for-each (lambda (form)
(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)))
+ (emit "movq ~a(%rbp), %rax" offset)))
(define cur-lambda 0)
(define (fresh-lambda)
; first move the captured variables into param registers
(for-each
(lambda (e i)
- (emit "movq ~a(%rsp), ~a"
+ (emit "movq ~a(%rbp), ~a"
(cdr (assoc e env)) ; offset of the var
(param-register i)))
captured (range 0 (length captured)))
(emit "movq %rax, ~a" (param-register i))))
args (range argument-start (length args)))
- ; now call
- (emit "callq ~a" label)))
-
+ (emit "addq $~a, %rsp" si) ; adjust the stack pointer to account all the stuff we put in the env
+ (emit "callq ~a" label)
+ (emit "subq $~a, %rsp" si)))
(define (codegen-lambda l)
(let* ((label (car l))
(args (cadr l))
(captured (caddr l))
(body (cadddr l))
- ; captured, then args
- (vars (append captured args))
+; params = what actually gets passed
+ (params (append captured args))
(param-registers (map param-register
- (range 0 (length vars))))
+ (range 0 (length params))))
(stack-offsets (map (lambda (i)
(* (- wordsize) i))
- (range 0 (length vars))))
+ (range 1 (length params))))
(copy-insts (map (lambda (r o)
- (format "movq ~a, ~a(%rsp)"
- r o))
+ (format "movq ~a, ~a(%rbp)" r o))
param-registers stack-offsets))
- (env (map cons vars stack-offsets)))
+ (env (map cons params stack-offsets)))
(emit "~a:" label)
(display "## lambda body: ")
(display body)
(display "## environment: ")
(display env)
(newline)
- (amd64-abi
- (lambda ()
+
+ (emit "push %rbp") ; preserve caller's base pointer
+ (emit "movq %rsp, %rbp") ; set up our own base pointer
+
(for-each emit copy-insts)
- (codegen-expr body (* (- wordsize) (length vars)) env)
- )))) ; move args and capture vars to stack
+ (codegen-expr body (* (- wordsize) (+ 1 (length params))) env)
+
+ (emit "pop %rbp") ; restore caller's base pointer
+ (emit "ret")))
(define cur-label 0)
(define (fresh-label)
(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))
-
- (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"))
+;; (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
(lambdas (car extract-res-1))
(xform-prog (cdr extract-res-1)))
- (emit "\t.globl _start")
+ (emit "\t.global _start")
(emit "\t.text")
; (emit ".p2align 4,,15") is this needed?
(for-each codegen-lambda lambdas)
-
(emit "_start:")
+ (emit "movq %rsp, %rbp") ; set up the base pointer
(codegen-expr xform-prog 0 '())
; exit syscall
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