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mescc: Enhance [int/pointer] array support.

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* module/language/c99/compiler.mes (p-expr->type): Handle array-ref
  with any index.
  (ast->info): Support plain array declerations.
  (expr->accu): For size == 4, assume value in accu.  Fixes int/pointer arrays.
* scaffold/t.c: Test it.
This commit is contained in:
Jan Nieuwenhuizen 2017-05-05 09:24:19 +02:00
parent 03211ee91d
commit f5372bdeff
2 changed files with 36 additions and 19 deletions
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50
module/language/c99/compiler.mes
View file

@ -742,16 +742,16 @@
(info (append-text info (wrap-as (append (i386:pop-base))))))
(append-text info
(append (if (eq? size 1) (wrap-as (i386:byte-base->accu-address))
(append
(wrap-as (i386:base-address->accu-address))
(if (<= size 4) '()
(wrap-as (append (i386:accu+n 4)
(i386:base+n 4)
(i386:base-address->accu-address))))
(if (<= size 8) '()
(wrap-as (append (i386:accu+n 4)
(i386:base+n 4)
(i386:base-address->accu-address))))))))))
(if (<= size 4) (wrap-as (i386:base->accu-address))
(append
(wrap-as (i386:base-address->accu-address))
(wrap-as (append (i386:accu+n 4)
(i386:base+n 4)
(i386:base-address->accu-address)))
(if (<= size 8) '()
(wrap-as (append (i386:accu+n 4)
(i386:base+n 4)
(i386:base-address->accu-address)))))))))))
(_ (error "expr->accu: unsupported assign: " a)))))
(_ (error "expr->accu: unsupported: " o))))))
@ -1074,7 +1074,7 @@
(define (p-expr->type info o)
(pmatch o
((p-expr (ident ,name)) (ident->type info name))
((array-ref (p-expr (fixed ,index)) (p-expr (ident ,array)))
((array-ref ,index (p-expr (ident ,array)))
(ident->type info array))
(_ (error "p-expr->type: unsupported: " o))))
@ -1473,8 +1473,9 @@
))
;; struct foo bar[2];
((decl (decl-spec-list (type-spec (struct-ref (ident ,type)))) (init-declr-list (init-declr (array-of (ident ,name) (p-expr (fixed ,count))))))
(let ((type (ast->type `(struct-ref (ident ,type)))))
;; char arena[20000];
((decl (decl-spec-list (type-spec ,type)) (init-declr-list (init-declr (array-of (ident ,name) (p-expr (fixed ,count))))))
(let ((type (ast->type type)))
(if (.function info)
(let* ((local (car (add-local locals name type -1)))
(count (string->number count))
@ -1483,12 +1484,6 @@
(locals (cons local locals))
(info (clone info #:locals locals)))
info)
(error "ast->info: unsupported global: " o))))
;; char arena[20000];
((decl (decl-spec-list (type-spec ,type)) (init-declr-list (init-declr (array-of (ident ,name) (p-expr (fixed ,count))))))
(let ((type (ast->type type)))
(if (.function info) (error "ast->info: unsupported local: " o)
(let* ((globals (.globals info))
(count (cstring->number count))
(size (type->size info type))
@ -1496,6 +1491,23 @@
(globals (append globals (list array))))
(clone info #:globals globals)))))
;; char* a[10];
((decl (decl-spec-list (type-spec ,type)) (init-declr-list (init-declr (ptr-declr (pointer) (array-of (ident ,name) (p-expr (fixed ,count)))))))
(let ((type (ast->type type)))
(if (.function info)
(let* ((local (car (add-local locals name type -1)))
(count (string->number count))
(size (type->size info type))
(local (make-local name type 1 (+ (local:id local) (* count size))))
(locals (cons local locals))
(info (clone info #:locals locals)))
info)
(let* ((globals (.globals info))
(count (cstring->number count))
(size (type->size info type))
(array (make-global name type 1 (string->list (make-string (* count size) #\nul))))
(globals (append globals (list array))))
(clone info #:globals globals)))))
;; struct foo bar;
((decl (decl-spec-list (type-spec (struct-ref (ident ,type)))) (init-declr-list (init-declr (ident ,name))))

5
scaffold/t.c
View file

@ -190,6 +190,11 @@ array_test (char **e)
{
int i = 0;
puts ("a[i] = i-1\n");
int a[3];
for (int i=0; i < 3; i++) a[i] = i-1;
for (int i=0; i < 3; i++) if (a[i] != i-1) return 1;
puts ("env [");
puts (itoa (env));
puts ("]\n");