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(use-modules (ice-9 format))
(define (emit template-string . args)
(apply format #t template-string args)
(newline))
(define (compile-program x)
(define fixnum-shift 2)
(define fixnum-tag 0)
(define char-shift 8)
(define char-tag 15)
(define boolean-shift 7)
(define boolean-tag 31)
(define empty-list 47) ;; #b00101111
(define (immediate-rep x)
(cond
((integer? x)
(ash x fixnum-shift))
((char? x)
(logior (ash (char->integer x) char-shift) char-tag))
((boolean? x)
(logior (ash (if x 1 0) boolean-shift) boolean-tag))
((null? x)
empty-list)))
(with-output-to-file "scheme_entry.S"
(lambda ()
(display ".text
.p2align 4
.globl scheme_entry
.type scheme_entry, @function
scheme_entry:
")
(emit "movl $~a, %eax" (immediate-rep x))
(emit "ret"))))
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