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mescc: Bugfix for break in switch not in compound. 

* module/language/c99/compiler.mes (clause->jump-info): Rename from
  case->jump-info.
  (statements->clauses): New function.
  (ast->info): Use it.  Fixes switch statement with break in a case
  outside of a compound.
* scaffold/t.c (swits): Test it.
This commit is contained in:
Jan Nieuwenhuizen 2017-05-06 08:39:04 +02:00
parent f5372bdeff
commit 6dc19bd040
2 changed files with 56 additions and 14 deletions
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64
module/language/c99/compiler.mes
View File

@ -858,7 +858,7 @@
(let ((s (string-drop o (string-length prefix))))
(map byte->hex (string-split s #\space))))))
(define (case->jump-info info)
(define (clause->jump-info info)
(define (jump n)
(wrap-as (i386:Xjump n)))
(define (jump-nz n)
@ -1092,6 +1092,49 @@
(define (local? o) ;; formals < 0, locals > 0
(positive? (local:id o)))
(define (statements->clauses statements)
(let loop ((statements statements) (clauses '()))
(if (null? statements) clauses
(let ((s (car statements)))
(pmatch s
((case ,test (compd-stmt (block-item-list . _)))
(loop (cdr statements) (append clauses (list s))))
((case ,test (break))
(loop (cdr statements) (append clauses (list s))))
((case ,test) (loop (cdr statements) (append clauses (list s))))
((case ,test ,statement)
(let loop2 ((statement statement) (heads `((case ,test))))
(define (heads->case heads statement)
(if (null? heads) statement
(append (car heads) (list (heads->case (cdr heads) statement)))))
(pmatch statement
((case ,t2 ,s2) (loop2 s2 (append heads `((case ,t2)))))
((default ,s2) (loop2 s2 (append heads `((default)))))
((compd-stmt (block-item-list . _)) (loop (cdr statements) (append clauses (list (heads->case heads statement)))))
(_ (let loop3 ((statements (cdr statements)) (c (list statement)))
(if (null? statements) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c))))))
(let ((s (car statements)))
(pmatch s
((case . _) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c)))))))
((default _) (loop statements (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@c)))))))
((break) (loop (cdr statements) (append clauses (list (heads->case heads `(compd-stmt (block-item-list ,@(append c (list s)))))))))
(_ (loop3 (cdr statements) (append c (list s))))))))))))
((default (compd-stmt (block-item-list _)))
(loop (cdr statements) (append clauses (list s))))
((default . ,statement)
(let loop2 ((statements (cdr statements)) (c statement))
(if (null? statements) (loop statements (append clauses (list `(default ,@c))))
(let ((s (car statements)))
(pmatch s
((compd-stmt (block-item-list . _)) (loop (cdr statements) (append clauses (list `(default ,s)))))
((case . _) (loop statements (append clauses (list `(default (compd-stmt (block-item-list ,@c)))))))
((default _) (loop statements (append clauses (list `(default (compd-stmt (block-item-list ,@c)))))))
((break) (loop (cdr statements) (append clauses (list `(default (compd-stmt (block-item-list ,@(append c (list s)))))))))
(_ (loop2 (cdr statements) (append c (list s)))))))))
(_ (error "statements->clauses: unsupported:" s)))))))
(define (ast->info info)
(lambda (o)
(let ((globals (.globals info))
@ -1217,16 +1260,17 @@
else-text)
#:globals (.globals else-info))))
((switch ,expr (compd-stmt (block-item-list . ,cases)))
(let* ((expr ((expr->accu info) expr))
((switch ,expr (compd-stmt (block-item-list . ,statements)))
(let* ((clauses (statements->clauses statements))
(expr ((expr->accu info) expr))
(empty (clone info #:text '()))
(case-infos (map (case->jump-info empty) cases))
(case-lengths (map (lambda (c-j) (length (text->list (.text (c-j 0))))) case-infos))
(cases-info (let loop ((cases cases) (info expr) (lengths case-lengths))
(if (null? cases) info
(let ((c-j ((case->jump-info info) (car cases))))
(loop (cdr cases) (c-j (apply + (cdr lengths))) (cdr lengths)))))))
cases-info))
(clause-infos (map (clause->jump-info empty) clauses))
(clause-lengths (map (lambda (c-j) (length (text->list (.text (c-j 0))))) clause-infos))
(clauses-info (let loop ((clauses clauses) (info expr) (lengths clause-lengths))
(if (null? clauses) info
(let ((c-j ((clause->jump-info info) (car clauses))))
(loop (cdr clauses) (c-j (apply + (cdr lengths))) (cdr lengths)))))))
clauses-info))
((for ,init ,test ,step ,body)
(let* ((info (clone info #:text '())) ;; FIXME: goto in body...

6
scaffold/t.c
View File

@ -128,10 +128,8 @@ swits (int c)
}
case -1:
case 1:
{
x = 1;
break;
}
x = 1;
break;
default:
{
x = 2;