re PR fortran/33254 (Diagnose different string lengths in array constructors at run time)

2007-10-13  Tobias Schlueter  <tobi@gcc.gnu.org>
    Paul Thomas  <pault@gcc.gnu.org>

PR fortran/33254
PR fortran/33727
fortran/
* trans-array.c (get_array_ctor_var_strlen): Check upper bound for
constness instead of lower bound.
(get_array_ctor_strlen): Add bounds-checking code.
testsuite/
* bounds_check_10.f90: New.

Co-Authored-By: Paul Thomas <pault@gcc.gnu.org>

From-SVN: r129286

gcc/fortran/ChangeLog

+2007-10-13  Tobias Schlter  <tobi@gcc.gnu.org>
+	    Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/33254
+	PR fortran/33727
+	* trans-array.c (get_array_ctor_var_strlen): Check upper bound for
+	constness instead of lower bound.
+	(get_array_ctor_strlen): Add bounds-checking code.
+
 2007-10-12  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/33542

gcc/fortran/trans-array.c

@@ -1340,7 +1340,7 @@ get_array_ctor_var_strlen (gfc_expr * expr, tree * len)
 
 	case REF_SUBSTRING:
 	  if (ref->u.ss.start->expr_type != EXPR_CONSTANT
-		|| ref->u.ss.start->expr_type != EXPR_CONSTANT)
+	      || ref->u.ss.end->expr_type != EXPR_CONSTANT)
 	    break;
 	  mpz_init_set_ui (char_len, 1);
 	  mpz_add (char_len, char_len, ref->u.ss.end->value.integer);
@@ -1413,6 +1413,7 @@ bool
 get_array_ctor_strlen (stmtblock_t *block, gfc_constructor * c, tree * len)
 {
   bool is_const;
+  tree first_len = NULL_TREE;
   
   is_const = TRUE;
 
@@ -1447,6 +1448,23 @@ get_array_ctor_strlen (stmtblock_t *block, gfc_constructor * c, tree * len)
 	  get_array_ctor_all_strlen (block, c->expr, len);
 	  break;
 	}
+      if (flag_bounds_check)
+	{
+	  if (!first_len)
+	    first_len = *len;
+	  else
+	    {
+	      /* Verify that all constructor elements are of the same
+		 length.  */
+	      tree cond = fold_build2 (NE_EXPR, boolean_type_node,
+				       first_len, *len);
+	      gfc_trans_runtime_check
+		(cond, block, &c->expr->where,
+		 "Different CHARACTER lengths (%ld/%ld) in array constructor",
+		 fold_convert (long_integer_type_node, first_len),
+		 fold_convert (long_integer_type_node, *len));
+	    }
+	}
     }
 
   return is_const;

gcc/testsuite/ChangeLog

+2007-10-13  Tobias Schlter  <tobi@gcc.gnu.org>
+	    Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/33254
+	PR fortran/33727
+	* bounds_check_10.f90: New.
+
 2007-10-13  David Edelsohn  <edelsohn@gnu.org>
 
 	* gcc.target/powerpc/parity-1.c: POWER5 feature, not POWER6.

gcc/testsuite/gfortran.dg/bounds_check_10.f90

+! { dg-do run }
+! { dg-options "-fbounds-check" }
+! { dg-shouldfail "Different CHARACTER lengths" }
+! PR fortran/33254: No bounds checking for array constructors
+program array_char
+implicit none
+character (len=2) :: x, y
+character (len=2) :: z(3)
+x = "a "
+y = "cd"
+z = [y(1:1), x(1:len(trim(x)))]  ! should work
+z = [trim(x), trim(y), "aaaa"] ! [ "a", "cd", "aaaa" ] should catch first error
+end program array_char
+
+! { dg-output "Different CHARACTER lengths .1/2. in array constructor" }