(load "typecheck.scm")
(load "ast.scm")
+(define target 'darwin)
+
(define (emit . s)
(begin
(apply printf s)
(emit "not %rax")
(emit "andq $1, %rax"))
+; 'write file handle addr-string num-bytes
+
(define (codegen-print x si env)
(codegen-expr x si env) ; x should be a static-string, producing a label
(emit "not %rcx") ; -%rcx = strlen + 1
(emit "dec %rcx")
- (emit "mov %rcx, %rdx") ; number of bytes
- (emit "mov %rax, %rsi") ; addr of string
- (emit "mov $1, %rax") ; file handle 1 (stdout)
- (emit "mov $1, %rdi") ; syscall 1 (write)
+ (case target
+ ('darwin
+ (emit "movq %rax, %rsi") ; string addr
+ (emit "movq %rcx, %rdx") ; num bytes
+ (emit "movq $1, %rdi") ; file handle (stdout)
+ (emit "movq $0x2000004, %rax")) ; syscall 4 (write)
+ ('linux
+ (emit "mov %rax, %rsi") ; string addr
+ (emit "mov %rcx, %rdx") ; num bytes
+ (emit "mov $1, %rax") ; file handle (stdout)
+ (emit "mov $1, %rdi"))) ; syscall 1 (write)
(emit "syscall"))
(define (range s n)
(emit "pop %rbp") ; restore caller's base pointer
(emit "ret")))
+(define (codegen-string label)
+ (case target
+ ('darwin (emit "movq ~a@GOTPCREL(%rip), %rax" label))
+ ('linux (emit "movq $~a, %rax" label))))
+
(define cur-label 0)
(define (fresh-label)
(set! cur-label (+ 1 cur-label))
('bool-literal (emit "movq $~a, %rax" (if e 1 0)))
('int-literal (emit "movq $~a, %rax" e))
- ('static-string (emit "movq $~a, %rax" (cadr e))) ; move label
+ ('static-string (codegen-string (cadr e)))
(else (error #f "don't know how to codegen this"))))
; exit syscall
(emit "mov %rax, %rdi")
- (emit "mov $60, %rax")
+ (case target
+ ('darwin (emit "movq $0x2000001, %rax"))
+ ('linux (emit "mov $60, %rax")))
(emit "syscall")
(emit "\t.data")
(for-each codegen-string-data strings)))
-(define (compile-to-binary program output)
+(define (compile-to-binary program output t)
+ (set! target t)
(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 (format "clang -nostdlib /tmp/a.s -o ~a" output))))
+
+ (case target
+ ('darwin
+ (system "as /tmp/a.s -o /tmp/a.o")
+ (system (format "ld /tmp/a.o -e _start -macosx_version_min 10.14 -static -o ~a" output)))
+ ('linux
+ (system "as /tmp/a.s -o /tmp/a.o")
+ (system (format "ld /tmp/a.o -o ~a" output))))))