re PR fortran/87336 (wrong output for pointer dummy assiocated to target actual argument)

2018-09-18  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/87336
	* trans-array.c (gfc_get_array_span): Try to get the element
	length of incomplete types. Return NULL_TREE otherwise.
	(gfc_conv_expr_descriptor): Only set the 'span' field if the
	above does not return NULL_TREE. Set 'span' field if possible
	for all new descriptors.

2018-09-18  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/87336
	* gfortran.dg/pointer_array_10.f90 : New test.
	* gfortran.dg/assign_10.f90 : Increase 'parm' count to 20.
	* gfortran.dg/transpose_optimization_2.f90 : Increase 'parm'
	count to 72.

From-SVN: r264405

gcc/fortran/ChangeLog

+2018-09-18  Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/87336
+	* trans-array.c (gfc_get_array_span): Try to get the element
+	length of incomplete types. Return NULL_TREE otherwise.
+	(gfc_conv_expr_descriptor): Only set the 'span' field if the
+	above does not return NULL_TREE. Set 'span' field if possible
+	for all new descriptors.
+
 2018-09-17  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/64120

gcc/fortran/trans-array.c

@@ -849,10 +849,22 @@ gfc_get_array_span (tree desc, gfc_expr *expr)
   else
     {
       /* If none of the fancy stuff works, the span is the element
-	 size of the array.  */
+	 size of the array. Attempt to deal with unbounded character
+	 types if possible. Otherwise, return NULL_TREE.  */
       tmp = gfc_get_element_type (TREE_TYPE (desc));
-      tmp = fold_convert (gfc_array_index_type,
-			  size_in_bytes (tmp));
+      if (tmp && TREE_CODE (tmp) == ARRAY_TYPE
+	  && TYPE_MAX_VALUE (TYPE_DOMAIN (tmp)) == NULL_TREE)
+	{
+	  if (expr->expr_type == EXPR_VARIABLE
+	      && expr->ts.type == BT_CHARACTER)
+	    tmp = fold_convert (gfc_array_index_type,
+				gfc_get_expr_charlen (expr));
+	  else
+	    tmp = NULL_TREE;
+	}
+      else
+	tmp = fold_convert (gfc_array_index_type,
+			    size_in_bytes (tmp));
     }
   return tmp;
 }
@@ -7074,7 +7086,8 @@ gfc_conv_expr_descriptor (gfc_se *se, gfc_expr *expr)
 
 	      /* ....and set the span field.  */
 	      tmp = gfc_get_array_span (desc, expr);
-	      gfc_conv_descriptor_span_set (&se->pre, se->expr, tmp);
+	      if (tmp != NULL_TREE)
+		gfc_conv_descriptor_span_set (&se->pre, se->expr, tmp);
 	    }
 	  else if (se->want_pointer)
 	    {
@@ -7344,13 +7357,9 @@ gfc_conv_expr_descriptor (gfc_se *se, gfc_expr *expr)
       desc = info->descriptor;
       if (se->direct_byref && !se->byref_noassign)
 	{
-	  /* For pointer assignments we fill in the destination....  */
+	  /* For pointer assignments we fill in the destination.  */
 	  parm = se->expr;
 	  parmtype = TREE_TYPE (parm);
-
-	  /* ....and set the span field.  */
-	  tmp = gfc_get_array_span (desc, expr);
-	  gfc_conv_descriptor_span_set (&loop.pre, parm, tmp);
 	}
       else
 	{
@@ -7388,6 +7397,11 @@ gfc_conv_expr_descriptor (gfc_se *se, gfc_expr *expr)
 	    }
 	}
 
+      /* Set the span field.  */
+      tmp = gfc_get_array_span (desc, expr);
+      if (tmp != NULL_TREE)
+	gfc_conv_descriptor_span_set (&loop.pre, parm, tmp);
+
       offset = gfc_index_zero_node;
 
       /* The following can be somewhat confusing.  We have two

gcc/testsuite/ChangeLog

+2018-09-18  Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/87336
+	* gfortran.dg/pointer_array_10.f90 : New test.
+	* gfortran.dg/assign_10.f90 : Increase 'parm' count to 20.
+	* gfortran.dg/transpose_optimization_2.f90 : Increase 'parm'
+	count to 72.
+
 2018-09-18  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/85065

gcc/testsuite/gfortran.dg/assign_10.f90

@@ -23,5 +23,5 @@ end
 ! cases will all yield a temporary, so that atmp appears 18 times.
 ! Note that it is the kind conversion that generates the temp.
 !
-! { dg-final { scan-tree-dump-times "parm" 18 "original" } }
+! { dg-final { scan-tree-dump-times "parm" 20 "original" } }
 ! { dg-final { scan-tree-dump-times "atmp" 18 "original" } }

gcc/testsuite/gfortran.dg/pointer_array_10.f90

+! { dg-do run }
+!
+! Test the fix for PR87336, in which the 'span' field of the array
+! descriptor, passed to 'show', was not set.
+!
+! Contributed by Juergen Reuter  <juergen.reuter@desy.de> following
+! a posting to clf by 'Spectrum'.
+!
+program main
+  implicit none
+  integer, target :: a( 2:4 )
+
+  a = [2,3,4]
+!  print *, "a [before] = ", a
+  call show( a )
+!  print *, "a [after]  = ", a
+  if (any (a .ne. [200,300,400])) stop 1
+
+contains
+  subroutine show( arr )
+    integer, pointer, intent(in) :: arr(:)
+!    print *, "arr = ", arr
+!    print *, "bounds = ", lbound(arr), ubound(arr)
+    arr(:) = [200,300,400]
+!    print *, "arr2= ", arr
+  end subroutine show
+  end program

gcc/testsuite/gfortran.dg/transpose_optimization_2.f90

@@ -60,5 +60,5 @@ end
 !
 ! The check below for temporaries gave 14 and 33 for "parm" and "atmp".
 !
-! { dg-final { scan-tree-dump-times "parm" 66 "original" } }
+! { dg-final { scan-tree-dump-times "parm" 72 "original" } }
 ! { dg-final { scan-tree-dump-times "atmp" 12 "original" } }