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mescc: Tinycc support: Implement ((struct foo*)p)->bar.

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* module/language/c99/compiler.mes (expr->accu*):
* scaffold/tests/7p-struct-cast.c: Test it.
* build-aux/check-mescc.sh (tests): Run it.
This commit is contained in:
Jan Nieuwenhuizen 2018-05-12 00:20:51 +02:00
parent 057607ca0a
commit ad9f171c49
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GPG key ID: F3C1A0D9C1D65273
3 changed files with 80 additions and 6 deletions
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1
build-aux/check-mescc.sh
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@ -112,6 +112,7 @@ t
7m-struct-char-array-assign
7n-struct-struct-array
7o-struct-pre-post
7p-struct-cast
80-setjmp
81-qsort
82-define

50
module/language/c99/compiler.mes
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@ -812,15 +812,47 @@
(info (expr->base array info)))
(append-text info (wrap-as (i386:accu+base)))))
;;((cast (type-name (decl-spec-list (type-spec (typename "Elf32_Rel"))) (abs-declr (pointer))) (add (i-sel (ident "data") (p-expr (ident "sr"))) (p-expr (ident "a")))))
((cast ,type ,expr)
(expr->accu expr info))
(expr->accu `(ref-to ,expr) info))
;; ((post-dec (p-expr (ident "vtop"))))
((add ,a ,b)
(let* ((rank (expr->rank info a))
(rank-b (expr->rank info b))
(type (ast->basic-type a info))
(struct? (structured-type? type))
(size (cond ((= rank 1) (ast-type->size info a))
((> rank 1) 4)
((and struct? (= rank 2)) 4)
(else 1))))
(if (or (= size 1)) ((binop->accu* info) a b (i386:accu+base))
(let* ((info (expr->accu b info))
(info (append-text info (wrap-as (append (i386:value->base size)
(i386:accu*base)
(i386:accu->base)))))
(info (expr->accu* a info)))
(append-text info (wrap-as (i386:accu+base)))))))
;; ((cast ,type ,expr)
;; (expr->accu `(ref-to ,expr) info))
((sub ,a ,b)
(let* ((rank (expr->rank info a))
(rank-b (expr->rank info b))
(type (ast->basic-type a info))
(struct? (structured-type? type))
(size (->size type))
(size (cond ((= rank 1) size)
((> rank 1) 4)
((and struct? (= rank 2)) 4)
(else 1))))
(if (or (= size 1) (or (= rank-b 2) (= rank-b 1)))
(let ((info ((binop->accu* info) a b (i386:accu-base))))
(if (and (not (= rank-b 2)) (not (= rank-b 1))) info
(append-text info (wrap-as (append (i386:value->base size)
(i386:accu/base))))))
(let* ((info (expr->accu* b info))
(info (append-text info (wrap-as (append (i386:value->base size)
(i386:accu*base)
(i386:accu->base)))))
(info (expr->accu* a info)))
(append-text info (wrap-as (i386:accu-base)))))))
((pre-dec ,expr)
(let* ((rank (expr->rank info expr))
@ -1285,6 +1317,12 @@
(info (expr->base b info)))
(append-text info (wrap-as c)))))
(define (binop->accu* info)
(lambda (a b c)
(let* ((info (expr->accu* a info))
(info (expr->base b info)))
(append-text info (wrap-as c)))))
(define (wrap-as o . annotation)
`(,@annotation ,o))

35
scaffold/tests/7p-struct-cast.c Normal file
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@ -0,0 +1,35 @@
/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* 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.
*
* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
*/
struct foo {int length; char* string;};
int
main ()
{
struct foo f = {3, "foo"};
struct foo *pf = &f;
char *p = (char*)&f;
int i = 0;
i = ((struct foo*)p)->length;
i = 0;
i = ((struct foo*)(p + i))->length;
return i - 3;
}