Discussion :

[ritayusri]

J'ai un projet de créer un compilateur en langage scheme, SVP,, est ce qu'il y a quelqu'un pour m'aider dans plusieurs choses..

[byjav]

À vrai dire, je n’ai aucune idée comment on écrit des compilateurs, mais on pourrait, peut-être, discuter quelque chose de concret.

[ritayusri]

C'est le code que j'ai écrit; mais il y a un problème pour le booléen dans (= ,expr1 ,expr2),

je doit écrire push $1 pour #f et push $9 pour #t mais je ne sais pas comment!

et aussi pour: (println #f) et (println #t)

Code :

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;;; File: codegen.scm
 	 
 	(include "match.scm")
 	 
 	;;;============================================================================
 	 
 	;; Program compiler.
 	 
 	(define (compile-program exprs)
 	(list " .text\n"
 	" .globl _main\n"
 	" .globl main\n"
 	"_main:\n"
 	"main:\n"
 	(map compile-expr exprs)
 	" mov $0, %rax\n"
 	" ret\n"))
 	 
 	(define jumping 0)
 	 
 	(define (compile-expr expr)
 	(if (and (pair? expr)
 	(equal? (car expr) 'println)
 	(pair? (cdr expr))
 	(null? (cddr expr)))
 	 
 	(let ((val (cadr expr)))
 	(list " push $" val "\n"
 	" call print_word_dec\n"
 	" push $10\n"
 	" call putchar\n"))
 	 
 	(error "unknown expression" expr)))
 	 
 	 
 	 
 	(define (compile-expr expr) ;; version avec macro "match"
 	(match expr
 	 
 	((println ,val)
 	 
 	(list " push $" val "\n"
 	" call print_word_dec\n"
 	" push $10\n"
 	" call putchar\n"))))
 	 
 	 
 	(define (compile-expr expr)
 	(match expr
 	 
 	((println ,expr1)
 	 
 	(append (compile-expr expr1)
 	(list " call print_word_dec\n"
 	" push $10\n"
 	" call putchar\n")))
 	 
 	(,val
 	 
 	(list " push $" val "\n"))))
 	 
 	 
 	(define (compile-expr expr)
 	(match expr
 	 
 	((println #f) ;when (boolean? expr1)
 	 
 	(append
 	(list " push $35\n"
 	" call putchar\n"
 	" push $102\n"
 	" call putchar\n"
 	" push $10\n"
 	" call putchar\n")))
 	 
 	((println #t) ;when (boolean? expr1)
 	 
 	(append
 	(list " push $35\n"
 	" call putchar\n"
 	" push $116\n"
 	" call putchar\n"
 	" push $10\n"
 	" call putchar\n")))
 	 
 	((println ,expr1)
 	 
 	(append (compile-expr expr1)
 	(list " call print_word_dec\n"
 	" push $10\n"
 	" call putchar\n")))
 	 
 	((+ ,expr1 ,expr2)
 	 
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rax\n"
 	" add %rax,(%rsp)\n")))
 	 
 	((- ,expr1 ,expr2)
 	 
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rax\n"
 	" sub %rax,(%rsp)\n")))
 	((* ,expr1 ,expr2)
 	 
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" imul (%rsp), %rbx\n"
 	" mov %rbx,(%rsp)\n")))
 	 
 	((quotient ,expr1 ,expr2)
 	 
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" mov (%rsp), %rax\n"
 	" cqto\n"
 	" idiv %rbx\n"
 	" mov %rax,(%rsp)\n")))
 	 
 	((modulo ,expr1 ,expr2)
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" mov %rbx, %rcx\n"
 	" mov (%rsp), %rax\n "
 	" cqto\n"
 	" idiv %rbx\n"
 	" mov %rdx, (%rsp)\n"
 	" test %rax, %rax\n"
 	(string-append " js negatif" (number->string (begin
 	(set! jumping (+ 1 jumping)) jumping)) "\n")
 	(string-append " positif" (number->string jumping) ":\n")
 	(string-append " jmp end" (number->string jumping) "\n")
 	(string-append " negatif" (number->string jumping) ":\n")
 	" test %rdx, %rdx\n"
 	(string-append " jz nul" (number->string jumping) "\n")
 	" add %rcx,(%rsp)\n"
 	(string-append " jmp end" (number->string jumping) "\n")
 	(string-append " nul" (number->string jumping) ":\n")
 	(string-append " jmp end" (number->string jumping) "\n")
 	(string-append " end" (number->string jumping) ":\n"))))
 	 
 	 
 	 
 	((= ,expr1 ,expr2)
 	(let ((et1 (gensym)))
 	(let ((et2 (gensym)))
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" pop %rax\n"
 	" cmp %rbx,%rax\n"
 	" je " et1 "\n"
 	" push $35\n";#
 	" call putchar\n"
 	" push $102\n";#f
 	" call putchar\n"
 	" push $10\n"
 	; " call putchar\n"
 	" jmp " et2 "\n"
 	" " et1 ":\n"
 	" push $35\n";#
 	" call putchar\n"
 	" push $116\n";#t
 	" call putchar\n"
 	" push $10\n"
 	; " call putchar\n"
 	" " et2 ":\n")))))
 	 
 	((< ,expr1 ,expr2)
 	(let ((et1 (gensym)))
 	(let ((et2 (gensym)))
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" pop %rax\n"
 	" sub %rbx,%rax\n"
 	" jl " et1 "\n"
 	" push $35\n";#
 	" call putchar\n"
 	" push $102\n";#f
 	" call putchar\n"
 	" push $10\n"
 	; " call putchar\n"
 	" jmp " et2 "\n"
 	" " et1 ":\n"
 	" push $35\n";#
 	" call putchar\n"
 	" push $116\n";#t
 	" call putchar\n"
 	" push $10\n"
 	; " call putchar\n"
 	" " et2 ":\n")))))
 	 
 	((if ,condition ,expr1 ,expr2)
 	 
 	(if condition
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rax\n"))
 	(append (compile-expr expr1)
 	(compile-expr expr2)
 	(list " pop %rbx\n"
 	" movq %rbx,(%rsp)\n"))))
 	 
 	 
 	(,val
 	(list " push $" val "\n"))))
 	;;;===========================================================================