Add ast-find

[scheme.git] / codegen.scm

diff --git a/codegen.scm b/codegen.scm
index 4e05bcf797b31d175a9629aac4b75868bbd9c72e..00e01296af20661539f8fda3d882c6fa39547092 100644 (file)
--- a/codegen.scm
+++ b/codegen.scm
@@ -1,7 +1,8 @@
 (load "typecheck.scm")
 (load "ast.scm")
+(load "platform.scm")
 
-(define target 'darwin)
+(define target host-os)
 
 (define (emit . s)
   (begin
@@ -67,17 +68,12 @@
   (emit "not %rcx")      ; -%rcx = strlen + 1
   (emit "dec %rcx")
   
-  (case target
-    ('darwin
   (emit "movq %rbx, %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 %rbx, %rsi")  ; string addr
-     (emit "mov %rcx, %rdx")  ; num bytes
-     (emit "mov $1, %rax")    ; file handle (stdout)
-     (emit "mov $1, %rdi"))) ; syscall 1 (write)
+  (case target
+    ('darwin (emit "mov $0x2000004, %rax")) ; syscall 4 (write)
+    ('linux  (emit "mov $1, %rax"))) ; syscall 1 (write)
   (emit "syscall"))
 
 (define (range s n)
@@ -253,11 +249,6 @@
     (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 "lea $~a, %rax" label))))
-
 (define cur-label 0)
 (define (fresh-label)
   (set! cur-label (+ 1 cur-label))
@@ -304,12 +295,12 @@
     ('bool-literal (emit "movq $~a, %rax" (if e 1 0)))
     ('int-literal (emit "movq $~a, %rax" e))
     
-    ('static-string (codegen-string (cadr e)))
+    ('static-string (emit "movq ~a@GOTPCREL(%rip), %rax"
+                         (cadr 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 '())