152 lines
4.9 KiB
Scheme
152 lines
4.9 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; compiler.mes: This file is part of Mes.
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;;;
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;;; Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Mes is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; compiler.mes produces an i386 binary from the C produced by
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;;; c-parser.
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;;; Code:
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(mes-use-module (mes elf))
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(mes-use-module (mes libc-i386))
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(mes-use-module (mes match))
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(mes-use-module (srfi srfi-1))
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(mes-use-module (language c lexer))
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(mes-use-module (language c parser))
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(define mescc
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(let ((errorp
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(lambda args
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(for-each display args)
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(newline))))
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(lambda ()
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(c-parser (c-lexer errorp) errorp))))
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(define (write-any x) (write-char (if (char? x) x (integer->char (if (>= x 0) x (+ x 256))))))
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(define (ast:function? o)
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(and (pair? o) (eq? (car o) 'function)))
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(define (.name o)
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(cadr o))
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;; (define (.statement o)
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;; (match o
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;; (('function name signature statement) statement)
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;; (_ #f)))
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;; (define (statement->data o)
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;; (match o
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;; (('call 'puts ('arguments string)) (string->list string))
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;; (_ '())))
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;; (define (statement->text o)
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;; (match o
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;; (('call 'puts ('arguments string)) (list (lambda (data) (i386:puts data (string-length string)))))
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;; (('return code) (list (lambda (data) (i386:exit code))))
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;; (_ '())))
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(define (.statement o)
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(and (pair? o)
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(eq? (car o) 'function)
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(cadddr o)))
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(define (statement->data o)
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(or (and (pair? o)
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(eq? (car o) 'call)
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(string->list (cadr (caddr o))))
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(and (pair? o) (eq? (car o) 'for)
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(let ((statement (cadr (cdddr o))))
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(statement->data statement)))
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'()))
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(define (statement->text data o)
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(cond
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((and (pair? o) (eq? (car o) 'call))
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(let ((string (cadr (caddr o)))
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(offset (length data)))
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(list (lambda (data) (i386:puts (+ data offset) (string-length string))))))
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((and (pair? o) (eq? (car o) 'for))
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(let ((start (cadr o))
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(test (caddr o))
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(step (cadddr o))
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(statement (cadr (cdddr o))))
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(display "start:" (current-error-port))
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(display start (current-error-port))
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(newline (current-error-port))
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(display "test:" (current-error-port))
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(display test (current-error-port))
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(newline (current-error-port))
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(display "step:" (current-error-port))
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(display step (current-error-port))
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(newline (current-error-port))
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(display "for-statement:" (current-error-port))
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(display statement (current-error-port))
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(newline (current-error-port))
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(let ((start (cadr (cdadr start)))
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(test (cadr (cdadr test)))
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;;(step (cadr (cdadr step)))
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(step 1)
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(statement (car (statement->text data statement)))
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)
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(display "2start:" (current-error-port))
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(display start (current-error-port))
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(newline (current-error-port))
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(display "2for-statement:" (current-error-port))
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(display statement (current-error-port))
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(newline (current-error-port))
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(list (lambda (d) (i386:for start test step (statement d)))))))
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((and (pair? o) (eq? (car o) 'return))
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(list (lambda (data) (i386:exit (cadr o)))))
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(else '())))
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(define (compile)
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(let* ((ast (mescc))
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(functions (filter ast:function? (cdr ast)))
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(main (find (lambda (x) (eq? (.name x) 'main)) functions))
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(statements (cdr (.statement main))))
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(display "program: " (current-error-port))
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(display ast (current-error-port))
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(newline (current-error-port))
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(let loop ((statements statements) (text '()) (data '()))
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(display "text:" (current-error-port))
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(display text (current-error-port))
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(newline (current-error-port))
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(if (null? statements)
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(begin
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(display "dumping to a.out:\n" (current-error-port))
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(map write-any (make-elf (lambda (data)
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(append-map (lambda (f) (f data)) text)) data)))
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(let* ((statement (car statements)))
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(display "statement:" (current-error-port))
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(display statement (current-error-port))
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(newline (current-error-port))
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(loop (cdr statements)
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(append text (statement->text data statement))
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(append data (statement->data statement))))))))
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