146 lines
5.2 KiB
Plaintext
146 lines
5.2 KiB
Plaintext
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;;; -*-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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;;; 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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;;; Nyacc c99.
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;;; Code:
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(cond-expand
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(guile
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(set-port-encoding! (current-output-port) "ISO-8859-1"))
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(mes
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(mes-use-module (nyacc lang c99 parser))
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(mes-use-module (mes pmatch))
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(mes-use-module (mes elf))
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(mes-use-module (mes libc-i386))))
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(define (mescc)
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(parse-c99 #:inc-dirs '()))
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(define (write-any x)
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(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) 'fctn-defn)))
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(define (.name o)
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(pmatch o
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((fctn-defn _ (ftn-declr (ident ,name) _) _) name)))
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(define (.statements o)
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(pmatch o
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((fctn-defn _ (ftn-declr (ident ,name) _) (compd-stmt (block-item-list . ,statements))) statements)))
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(define (statement->data o)
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(pmatch o
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((expr-stmt (fctn-call (p-expr (ident ,name))
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(expr-list (p-expr (string ,string)))))
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(string->list string))
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((for (decl (decl-spec-list (type-spec (fixed-type ,type)))
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(init-declr-list (init-declr (ident ,identifier)
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(initzer (p-expr (fixed ,start))))))
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(lt (p-expr (ident _)) (p-expr (fixed ,test)))
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,step ;;(pre-inc (p-expr (ident i)))
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,statement)
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(statement->data statement))
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(_ '())))
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(define (statement->text data o)
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(let ((offset (length data)))
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(pmatch o
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((expr-stmt (fctn-call (p-expr (ident ,name))
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(expr-list (p-expr (string ,string)))))
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(list (lambda (data) (i386:puts (+ data offset) (string-length string)))))
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((for (decl (decl-spec-list (type-spec (fixed-type ,type)))
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(init-declr-list (init-declr (ident ,identifier)
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(initzer (p-expr (fixed ,start))))))
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(lt (p-expr (ident _)) (p-expr (fixed ,test)))
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,step ;;(pre-inc (p-expr (ident i)))
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,statement)
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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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;;
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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 (string->number start))
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(test (string->number test))
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(step 1)
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(statement (car (statement->text data statement))))
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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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((return (p-expr (fixed ,value)))
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(let ((value (string->number value)))
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(list (lambda (data) (i386:exit value)))))
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(_ '()))))
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(define (function->text+data o)
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(let loop ((statements (.statements o)) (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) (values 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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(define (text+data->exe text data)
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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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(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) (equal? (.name x) "main")) functions)))
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(display "AST" (current-error-port))
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(pretty-print ast (current-error-port))
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(format (current-error-port) "functions~a\n" functions)
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(format (current-error-port) "main~a\n" main)
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(call-with-values
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(lambda () (function->text+data main))
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text+data->exe)))
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