diff options
Diffstat (limited to 'gcc/fortran/resolve.c')
| -rw-r--r-- | gcc/fortran/resolve.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c index 63c9abde22c..d0b7ab97aca 100644 --- a/gcc/fortran/resolve.c +++ b/gcc/fortran/resolve.c @@ -2509,7 +2509,9 @@ gfc_resolve_iterator (gfc_iterator * iter, bool real_ok) } -/* Resolve a list of FORALL iterators. */ +/* Resolve a list of FORALL iterators. The FORALL index-name is constrained + to be a scalar INTEGER variable. The subscripts and stride are scalar + INTEGERs, and if stride is a constant it must be nonzero. */ static void resolve_forall_iterators (gfc_forall_iterator * iter) @@ -2518,28 +2520,35 @@ resolve_forall_iterators (gfc_forall_iterator * iter) while (iter) { if (gfc_resolve_expr (iter->var) == SUCCESS - && iter->var->ts.type != BT_INTEGER) - gfc_error ("FORALL Iteration variable at %L must be INTEGER", + && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0)) + gfc_error ("FORALL index-name at %L must be a scalar INTEGER", &iter->var->where); if (gfc_resolve_expr (iter->start) == SUCCESS - && iter->start->ts.type != BT_INTEGER) - gfc_error ("FORALL start expression at %L must be INTEGER", + && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0)) + gfc_error ("FORALL start expression at %L must be a scalar INTEGER", &iter->start->where); if (iter->var->ts.kind != iter->start->ts.kind) gfc_convert_type (iter->start, &iter->var->ts, 2); if (gfc_resolve_expr (iter->end) == SUCCESS - && iter->end->ts.type != BT_INTEGER) - gfc_error ("FORALL end expression at %L must be INTEGER", + && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0)) + gfc_error ("FORALL end expression at %L must be a scalar INTEGER", &iter->end->where); if (iter->var->ts.kind != iter->end->ts.kind) gfc_convert_type (iter->end, &iter->var->ts, 2); - if (gfc_resolve_expr (iter->stride) == SUCCESS - && iter->stride->ts.type != BT_INTEGER) - gfc_error ("FORALL Stride expression at %L must be INTEGER", - &iter->stride->where); + if (gfc_resolve_expr (iter->stride) == SUCCESS) + { + if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0) + gfc_error ("FORALL stride expression at %L must be a scalar %s", + &iter->stride->where, "INTEGER"); + + if (iter->stride->expr_type == EXPR_CONSTANT + && mpz_cmp_ui(iter->stride->value.integer, 0) == 0) + gfc_error ("FORALL stride expression at %L cannot be zero", + &iter->stride->where); + } if (iter->var->ts.kind != iter->stride->ts.kind) gfc_convert_type (iter->stride, &iter->var->ts, 2); |
