mes/module/mescc/preprocess.scm

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;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(define-module (mescc preprocess)
#:use-module (ice-9 optargs)
#:use-module (system base pmatch)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (nyacc lang c99 parser)
#:use-module (mes guile)
#:export (c99-input->ast))
(define (logf port string . rest)
(apply format (cons* port string rest))
(force-output port)
#t)
(define (stderr string . rest)
(apply logf (cons* (current-error-port) string rest)))
(define mes? (pair? (current-module)))
(define* (c99-input->full-ast #:key (prefix "") (defines '()) (includes '()))
(let ((sys-include (if (equal? prefix "") "include" (string-append prefix "/share/include"))))
(parse-c99
#:inc-dirs (append includes (cons* sys-include "include" "lib" (or (and=> (getenv "C_INCLUDE_PATH") (cut string-split <> #\:)) '())))
#:cpp-defs `(
"NULL=0"
"__linux__=1"
"__i386__=1"
"POSIX=0"
"_POSIX_SOURCE=0"
"__STDC__=1"
"__MESC__=1"
,(if mes? "__MESC_MES__=1" "__MESC_MES__=0")
,@defines)
#:mode 'code)))
(define* (c99-input->ast #:key (prefix "") (defines '()) (includes '()))
(stderr "parsing: input\n")
((compose ast-strip-const ast-strip-comment) (c99-input->full-ast #:prefix prefix #:defines defines #:includes includes)))
(define (ast-strip-comment o)
(pmatch o
((comment . ,comment) #f)
(((comment . ,comment) . ,t) (filter-map ast-strip-comment t))
(((comment . ,comment) . ,cdr) cdr)
((,car . (comment . ,comment)) car)
((,h . ,t) (if (list? o) (filter-map ast-strip-comment o)
(cons (ast-strip-comment h) (ast-strip-comment t))))
(_ o)))
(define (ast-strip-const o)
(pmatch o
((type-qual ,qual) (if (equal? qual "const") #f o))
((pointer (type-qual-list (type-qual ,qual)) . ,rest)
(if (equal? qual "const") `(pointer ,@rest) o))
((decl-spec-list (type-qual ,qual))
(if (equal? qual "const") #f
`(decl-spec-list (type-qual ,qual))))
((decl-spec-list (type-qual ,qual) . ,rest)
(if (equal? qual "const") `(decl-spec-list ,@rest)
`(decl-spec-list (type-qual ,qual) ,@(map ast-strip-const rest))))
((decl-spec-list (type-qual-list (type-qual ,qual)) . ,rest)
(if (equal? qual "const") `(decl-spec-list ,@rest)
`(decl-spec-list (type-qual-list (type-qual ,qual)) ,@(map ast-strip-const rest))))
((,h . ,t) (if (list? o) (filter-map ast-strip-const o)
(cons (ast-strip-const h) (ast-strip-const t))))
(_ o)))