diff options
Diffstat (limited to 'gcc/fortran/trans-array.c')
| -rw-r--r-- | gcc/fortran/trans-array.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c index 803462a4..ac90a4b 100644 --- a/gcc/fortran/trans-array.c +++ b/gcc/fortran/trans-array.c @@ -2226,6 +2226,8 @@ trans_array_constructor (gfc_ss * ss, locus * where) gfc_ss_info *ss_info; gfc_expr *expr; gfc_ss *s; + tree neg_len; + char *msg; /* Save the old values for nested checking. */ old_first_len = first_len; @@ -2271,6 +2273,29 @@ trans_array_constructor (gfc_ss * ss, locus * where) gfc_conv_expr_type (&length_se, expr->ts.u.cl->length, gfc_charlen_type_node); ss_info->string_length = length_se.expr; + + /* Check if the character length is negative. If it is, then + set LEN = 0. */ + neg_len = fold_build2_loc (input_location, LT_EXPR, + boolean_type_node, ss_info->string_length, + build_int_cst (gfc_charlen_type_node, 0)); + /* Print a warning if bounds checking is enabled. */ + if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS) + { + msg = xasprintf ("Negative character length treated as LEN = 0"); + gfc_trans_runtime_check (false, true, neg_len, &length_se.pre, + where, msg); + free (msg); + } + + ss_info->string_length + = fold_build3_loc (input_location, COND_EXPR, + gfc_charlen_type_node, neg_len, + build_int_cst (gfc_charlen_type_node, 0), + ss_info->string_length); + ss_info->string_length = gfc_evaluate_now (ss_info->string_length, + &length_se.pre); + gfc_add_block_to_block (&outer_loop->pre, &length_se.pre); gfc_add_block_to_block (&outer_loop->post, &length_se.post); } |