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[pf3gnuchains/gcc-fork.git] / gcc / fortran / trans-expr.c
index b6a825a..5a45f4f 100644 (file)
@@ -158,7 +158,8 @@ gfc_conv_missing_dummy (gfc_se * se, gfc_expr * arg, gfc_typespec ts, int kind)
     {
       /* Create a temporary and convert it to the correct type.  */
       tmp = gfc_get_int_type (kind);
-      tmp = fold_convert (tmp, build_fold_indirect_ref (se->expr));
+      tmp = fold_convert (tmp, build_fold_indirect_ref_loc (input_location,
+                                                       se->expr));
     
       /* Test for a NULL value.  */
       tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present, tmp,
@@ -200,12 +201,12 @@ gfc_get_expr_charlen (gfc_expr *e)
   
   length = NULL; /* To silence compiler warning.  */
 
-  if (is_subref_array (e) && e->ts.cl->length)
+  if (is_subref_array (e) && e->ts.u.cl->length)
     {
       gfc_se tmpse;
       gfc_init_se (&tmpse, NULL);
-      gfc_conv_expr_type (&tmpse, e->ts.cl->length, gfc_charlen_type_node);
-      e->ts.cl->backend_decl = tmpse.expr;
+      gfc_conv_expr_type (&tmpse, e->ts.u.cl->length, gfc_charlen_type_node);
+      e->ts.u.cl->backend_decl = tmpse.expr;
       return tmpse.expr;
     }
 
@@ -213,7 +214,7 @@ gfc_get_expr_charlen (gfc_expr *e)
      expression's length could be the length of the character
      variable.  */
   if (e->symtree->n.sym->ts.type == BT_CHARACTER)
-    length = e->symtree->n.sym->ts.cl->backend_decl;
+    length = e->symtree->n.sym->ts.u.cl->backend_decl;
 
   /* Look through the reference chain for component references.  */
   for (r = e->ref; r; r = r->next)
@@ -222,7 +223,7 @@ gfc_get_expr_charlen (gfc_expr *e)
        {
        case REF_COMPONENT:
          if (r->u.c.component->ts.type == BT_CHARACTER)
-           length = r->u.c.component->ts.cl->backend_decl;
+           length = r->u.c.component->ts.u.cl->backend_decl;
          break;
 
        case REF_ARRAY:
@@ -242,7 +243,7 @@ gfc_get_expr_charlen (gfc_expr *e)
 }
 
 
-/* For each character array constructor subexpression without a ts.cl->length,
+/* For each character array constructor subexpression without a ts.u.cl->length,
    replace it by its first element (if there aren't any elements, the length
    should already be set to zero).  */
 
@@ -275,7 +276,7 @@ flatten_array_ctors_without_strlen (gfc_expr* e)
     case EXPR_ARRAY:
 
       /* We've found what we're looking for.  */
-      if (e->ts.type == BT_CHARACTER && !e->ts.cl->length)
+      if (e->ts.type == BT_CHARACTER && !e->ts.u.cl->length)
        {
          gfc_expr* new_expr;
          gcc_assert (e->value.constructor);
@@ -373,15 +374,18 @@ gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind,
     gfc_conv_string_parameter (se);
   else
     {
+      tmp = start.expr;
+      STRIP_NOPS (tmp);
       /* Avoid multiple evaluation of substring start.  */
-      if (!CONSTANT_CLASS_P (start.expr) && !DECL_P (start.expr))
+      if (!CONSTANT_CLASS_P (tmp) && !DECL_P (tmp))
        start.expr = gfc_evaluate_now (start.expr, &se->pre);
 
       /* Change the start of the string.  */
       if (TYPE_STRING_FLAG (TREE_TYPE (se->expr)))
        tmp = se->expr;
       else
-       tmp = build_fold_indirect_ref (se->expr);
+       tmp = build_fold_indirect_ref_loc (input_location,
+                                      se->expr);
       tmp = gfc_build_array_ref (tmp, start.expr, NULL);
       se->expr = gfc_build_addr_expr (type, tmp);
     }
@@ -395,7 +399,9 @@ gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind,
       gfc_conv_expr_type (&end, ref->u.ss.end, gfc_charlen_type_node);
       gfc_add_block_to_block (&se->pre, &end.pre);
     }
-  if (!CONSTANT_CLASS_P (end.expr) && !DECL_P (end.expr))
+  tmp = end.expr;
+  STRIP_NOPS (tmp);
+  if (!CONSTANT_CLASS_P (tmp) && !DECL_P (tmp))
     end.expr = gfc_evaluate_now (end.expr, &se->pre);
 
   if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS)
@@ -438,9 +444,9 @@ gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind,
     }
 
   tmp = fold_build2 (MINUS_EXPR, gfc_charlen_type_node,
-                    build_int_cst (gfc_charlen_type_node, 1),
-                    start.expr);
-  tmp = fold_build2 (PLUS_EXPR, gfc_charlen_type_node, end.expr, tmp);
+                    end.expr, start.expr);
+  tmp = fold_build2 (PLUS_EXPR, gfc_charlen_type_node,
+                    build_int_cst (gfc_charlen_type_node, 1), tmp);
   tmp = fold_build2 (MAX_EXPR, gfc_charlen_type_node, tmp,
                     build_int_cst (gfc_charlen_type_node, 0));
   se->string_length = tmp;
@@ -468,17 +474,19 @@ gfc_conv_component_ref (gfc_se * se, gfc_ref * ref)
 
   se->expr = tmp;
 
-  if (c->ts.type == BT_CHARACTER)
+  if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
     {
-      tmp = c->ts.cl->backend_decl;
+      tmp = c->ts.u.cl->backend_decl;
       /* Components must always be constant length.  */
       gcc_assert (tmp && INTEGER_CST_P (tmp));
       se->string_length = tmp;
     }
 
-  if ((c->attr.pointer && c->attr.dimension == 0 && c->ts.type != BT_CHARACTER)
+  if (((c->attr.pointer || c->attr.allocatable) && c->attr.dimension == 0
+       && c->ts.type != BT_CHARACTER)
       || c->attr.proc_pointer)
-    se->expr = build_fold_indirect_ref (se->expr);
+    se->expr = build_fold_indirect_ref_loc (input_location,
+                                       se->expr);
 }
 
 
@@ -503,14 +511,18 @@ conv_parent_component_references (gfc_se * se, gfc_ref * ref)
 
   if (dt->attr.extension && dt->components)
     {
+      if (dt->attr.is_class)
+       cmp = dt->components;
+      else
+       cmp = dt->components->next;
       /* Return if the component is not in the parent type.  */
-      for (cmp = dt->components->next; cmp; cmp = cmp->next)
+      for (; cmp; cmp = cmp->next)
        if (strcmp (c->name, cmp->name) == 0)
          return;
        
       /* Otherwise build the reference and call self.  */
       gfc_conv_component_ref (se, &parent);
-      parent.u.c.sym = dt->components->ts.derived;
+      parent.u.c.sym = dt->components->ts.u.derived;
       parent.u.c.component = c;
       conv_parent_component_references (se, &parent);
     }
@@ -621,21 +633,24 @@ gfc_conv_variable (gfc_se * se, gfc_expr * expr)
              && (sym->attr.dummy
                  || sym->attr.function
                  || sym->attr.result))
-           se->expr = build_fold_indirect_ref (se->expr);
+           se->expr = build_fold_indirect_ref_loc (input_location,
+                                               se->expr);
 
        }
       else if (!sym->attr.value)
        {
           /* Dereference non-character scalar dummy arguments.  */
          if (sym->attr.dummy && !sym->attr.dimension)
-           se->expr = build_fold_indirect_ref (se->expr);
+           se->expr = build_fold_indirect_ref_loc (input_location,
+                                               se->expr);
 
           /* Dereference scalar hidden result.  */
          if (gfc_option.flag_f2c && sym->ts.type == BT_COMPLEX
              && (sym->attr.function || sym->attr.result)
              && !sym->attr.dimension && !sym->attr.pointer
              && !sym->attr.always_explicit)
-           se->expr = build_fold_indirect_ref (se->expr);
+           se->expr = build_fold_indirect_ref_loc (input_location,
+                                               se->expr);
 
           /* Dereference non-character pointer variables. 
             These must be dummies, results, or scalars.  */
@@ -644,7 +659,8 @@ gfc_conv_variable (gfc_se * se, gfc_expr * expr)
                  || sym->attr.function
                  || sym->attr.result
                  || !sym->attr.dimension))
-           se->expr = build_fold_indirect_ref (se->expr);
+           se->expr = build_fold_indirect_ref_loc (input_location,
+                                               se->expr);
        }
 
       ref = expr->ref;
@@ -655,10 +671,10 @@ gfc_conv_variable (gfc_se * se, gfc_expr * expr)
     {
       /* If the character length of an entry isn't set, get the length from
          the master function instead.  */
-      if (sym->attr.entry && !sym->ts.cl->backend_decl)
-        se->string_length = sym->ns->proc_name->ts.cl->backend_decl;
+      if (sym->attr.entry && !sym->ts.u.cl->backend_decl)
+        se->string_length = sym->ns->proc_name->ts.u.cl->backend_decl;
       else
-        se->string_length = sym->ts.cl->backend_decl;
+        se->string_length = sym->ts.u.cl->backend_decl;
       gcc_assert (se->string_length);
     }
 
@@ -703,7 +719,7 @@ gfc_conv_variable (gfc_se * se, gfc_expr * expr)
      separately.  */
   if (se->want_pointer)
     {
-      if (expr->ts.type == BT_CHARACTER)
+      if (expr->ts.type == BT_CHARACTER && !gfc_is_proc_ptr_comp (expr, NULL))
        gfc_conv_string_parameter (se);
       else 
        se->expr = gfc_build_addr_expr (NULL_TREE, se->expr);
@@ -1080,7 +1096,8 @@ gfc_conv_power_op (gfc_se * se, gfc_expr * expr)
       break;
     }
 
-  se->expr = build_call_expr (fndecl, 2, lse.expr, rse.expr);
+  se->expr = build_call_expr_loc (input_location,
+                             fndecl, 2, lse.expr, rse.expr);
 }
 
 
@@ -1092,7 +1109,7 @@ gfc_conv_string_tmp (gfc_se * se, tree type, tree len)
   tree var;
   tree tmp;
 
-  gcc_assert (TREE_TYPE (len) == gfc_charlen_type_node);
+  gcc_assert (types_compatible_p (TREE_TYPE (len), gfc_charlen_type_node));
 
   if (gfc_can_put_var_on_stack (len))
     {
@@ -1151,7 +1168,7 @@ gfc_conv_concat_op (gfc_se * se, gfc_expr * expr)
   gfc_add_block_to_block (&se->pre, &lse.pre);
   gfc_add_block_to_block (&se->pre, &rse.pre);
 
-  type = gfc_get_character_type (expr->ts.kind, expr->ts.cl);
+  type = gfc_get_character_type (expr->ts.kind, expr->ts.u.cl);
   len = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
   if (len == NULL_TREE)
     {
@@ -1171,7 +1188,8 @@ gfc_conv_concat_op (gfc_se * se, gfc_expr * expr)
   else
     gcc_unreachable ();
 
-  tmp = build_call_expr (fndecl, 6, len, var, lse.string_length, lse.expr,
+  tmp = build_call_expr_loc (input_location,
+                        fndecl, 6, len, var, lse.string_length, lse.expr,
                         rse.string_length, rse.expr);
   gfc_add_expr_to_block (&se->pre, tmp);
 
@@ -1378,7 +1396,8 @@ string_to_single_character (tree len, tree str, int kind)
       && TREE_INT_CST_HIGH (len) == 0)
     {
       str = fold_convert (gfc_get_pchar_type (kind), str);
-      return build_fold_indirect_ref (str);
+      return build_fold_indirect_ref_loc (input_location,
+                                     str);
     }
 
   return NULL_TREE;
@@ -1481,24 +1500,169 @@ gfc_build_compare_string (tree len1, tree str1, tree len2, tree str2, int kind)
       else
        gcc_unreachable ();
 
-      tmp = build_call_expr (fndecl, 4, len1, str1, len2, str2);
+      tmp = build_call_expr_loc (input_location,
+                            fndecl, 4, len1, str1, len2, str2);
     }
 
   return tmp;
 }
 
+
+/* Return the backend_decl for a procedure pointer component.  */
+
+static tree
+get_proc_ptr_comp (gfc_expr *e)
+{
+  gfc_se comp_se;
+  gfc_expr *e2;
+  gfc_init_se (&comp_se, NULL);
+  e2 = gfc_copy_expr (e);
+  e2->expr_type = EXPR_VARIABLE;
+  gfc_conv_expr (&comp_se, e2);
+  gfc_free_expr (e2);
+  return build_fold_addr_expr_loc (input_location, comp_se.expr);
+}
+
+
+/* Select a class typebound procedure at runtime.  */
+static void
+select_class_proc (gfc_se *se, gfc_class_esym_list *elist,
+                  tree declared, gfc_expr *expr)
+{
+  tree end_label;
+  tree label;
+  tree tmp;
+  tree vindex;
+  stmtblock_t body;
+  gfc_class_esym_list *next_elist, *tmp_elist;
+  gfc_se tmpse;
+
+  /* Convert the vindex expression.  */
+  gfc_init_se (&tmpse, NULL);
+  gfc_conv_expr (&tmpse, elist->vindex);
+  gfc_add_block_to_block (&se->pre, &tmpse.pre);
+  vindex = gfc_evaluate_now (tmpse.expr, &se->pre);
+  gfc_add_block_to_block (&se->post, &tmpse.post);
+
+  /* Fix the function type to be that of the declared type method.  */
+  declared = gfc_create_var (TREE_TYPE (declared), "method");
+
+  end_label = gfc_build_label_decl (NULL_TREE);
+
+  gfc_init_block (&body);
+
+  /* Go through the list of extensions.  */
+  for (; elist; elist = next_elist)
+    {
+      /* This case has already been added.  */
+      if (elist->derived == NULL)
+       goto free_elist;
+
+      /* Run through the chain picking up all the cases that call the
+        same procedure.  */
+      tmp_elist = elist;
+      for (; elist; elist = elist->next)
+       {
+         tree cval;
+
+         if (elist->esym != tmp_elist->esym)
+           continue;
+
+         cval = build_int_cst (TREE_TYPE (vindex),
+                               elist->derived->vindex);
+         /* Build a label for the vindex value.  */
+         label = gfc_build_label_decl (NULL_TREE);
+         tmp = fold_build3 (CASE_LABEL_EXPR, void_type_node,
+                            cval, NULL_TREE, label);
+         gfc_add_expr_to_block (&body, tmp);
+
+         /* Null the reference the derived type so that this case is
+            not used again.  */
+         elist->derived = NULL;
+       }
+
+      elist = tmp_elist;
+
+      /* Get a pointer to the procedure,  */
+      tmp = gfc_get_symbol_decl (elist->esym);
+      if (!POINTER_TYPE_P (TREE_TYPE (tmp)))
+       {
+         gcc_assert (TREE_CODE (tmp) == FUNCTION_DECL);
+         tmp = gfc_build_addr_expr (NULL_TREE, tmp);
+       }
+
+      /* Assign the pointer to the appropriate procedure.  */
+      gfc_add_modify (&body, declared,
+                     fold_convert (TREE_TYPE (declared), tmp));
+
+      /* Break to the end of the construct.  */
+      tmp = build1_v (GOTO_EXPR, end_label);
+      gfc_add_expr_to_block (&body, tmp);
+
+      /* Free the elists as we go; freeing them in gfc_free_expr causes
+        segfaults because it occurs too early and too often.  */
+    free_elist:
+      next_elist = elist->next;
+      if (elist->vindex)
+       gfc_free_expr (elist->vindex);
+      gfc_free (elist);
+      elist = NULL;
+    }
+
+  /* Default is an error.  */
+  label = gfc_build_label_decl (NULL_TREE);
+  tmp = fold_build3 (CASE_LABEL_EXPR, void_type_node,
+                    NULL_TREE, NULL_TREE, label);
+  gfc_add_expr_to_block (&body, tmp);
+  tmp = gfc_trans_runtime_error (true, &expr->where,
+               "internal error: bad vindex in dynamic dispatch");
+  gfc_add_expr_to_block (&body, tmp);
+
+  /* Write the switch expression.  */
+  tmp = gfc_finish_block (&body);
+  tmp = build3_v (SWITCH_EXPR, vindex, tmp, NULL_TREE);
+  gfc_add_expr_to_block (&se->pre, tmp);
+
+  tmp = build1_v (LABEL_EXPR, end_label);
+  gfc_add_expr_to_block (&se->pre, tmp);
+
+  se->expr = declared;
+  return;
+}
+
+
 static void
 conv_function_val (gfc_se * se, gfc_symbol * sym, gfc_expr * expr)
 {
   tree tmp;
 
+  if (expr && expr->symtree
+       && expr->value.function.class_esym)
+    {
+      if (!sym->backend_decl)
+       sym->backend_decl = gfc_get_extern_function_decl (sym);
+
+      tmp = sym->backend_decl;
+
+      if (!POINTER_TYPE_P (TREE_TYPE (tmp)))
+       {
+         gcc_assert (TREE_CODE (tmp) == FUNCTION_DECL);
+         tmp = gfc_build_addr_expr (NULL_TREE, tmp);
+       }
+
+      select_class_proc (se, expr->value.function.class_esym,
+                        tmp, expr);
+      return;
+    }
+
   if (gfc_is_proc_ptr_comp (expr, NULL))
-    tmp = gfc_get_proc_ptr_comp (se, expr);
+    tmp = get_proc_ptr_comp (expr);
   else if (sym->attr.dummy)
     {
       tmp = gfc_get_symbol_decl (sym);
       if (sym->attr.proc_pointer)
-        tmp = build_fold_indirect_ref (tmp);
+        tmp = build_fold_indirect_ref_loc (input_location,
+                                      tmp);
       gcc_assert (TREE_CODE (TREE_TYPE (tmp)) == POINTER_TYPE
              && TREE_CODE (TREE_TYPE (TREE_TYPE (tmp))) == FUNCTION_TYPE);
     }
@@ -1599,7 +1763,9 @@ gfc_get_interface_mapping_array (stmtblock_t * block, gfc_symbol * sym,
   tree var;
 
   type = gfc_typenode_for_spec (&sym->ts);
-  type = gfc_get_nodesc_array_type (type, sym->as, packed);
+  type = gfc_get_nodesc_array_type (type, sym->as, packed,
+                                   !sym->attr.target && !sym->attr.pointer
+                                   && !sym->attr.proc_pointer);
 
   var = gfc_create_var (type, "ifm");
   gfc_add_modify (block, var, fold_convert (type, data));
@@ -1711,16 +1877,16 @@ gfc_add_interface_mapping (gfc_interface_mapping * mapping,
   if (sym->ts.type == BT_CHARACTER)
     {
       /* Create a copy of the dummy argument's length.  */
-      new_sym->ts.cl = gfc_get_interface_mapping_charlen (mapping, sym->ts.cl);
-      sm->expr->ts.cl = new_sym->ts.cl;
+      new_sym->ts.u.cl = gfc_get_interface_mapping_charlen (mapping, sym->ts.u.cl);
+      sm->expr->ts.u.cl = new_sym->ts.u.cl;
 
       /* If the length is specified as "*", record the length that
         the caller is passing.  We should use the callee's length
         in all other cases.  */
-      if (!new_sym->ts.cl->length && se)
+      if (!new_sym->ts.u.cl->length && se)
        {
          se->string_length = gfc_evaluate_now (se->string_length, &se->pre);
-         new_sym->ts.cl->backend_decl = se->string_length;
+         new_sym->ts.u.cl->backend_decl = se->string_length;
        }
     }
 
@@ -1738,7 +1904,8 @@ gfc_add_interface_mapping (gfc_interface_mapping * mapping,
       tmp = gfc_get_character_type_len (sym->ts.kind, NULL);
       tmp = build_pointer_type (tmp);
       if (sym->attr.pointer)
-        value = build_fold_indirect_ref (se->expr);
+        value = build_fold_indirect_ref_loc (input_location,
+                                        se->expr);
       else
         value = se->expr;
       value = fold_convert (tmp, value);
@@ -1747,11 +1914,13 @@ gfc_add_interface_mapping (gfc_interface_mapping * mapping,
   /* If the argument is a scalar, a pointer to an array or an allocatable,
      dereference it.  */
   else if (!sym->attr.dimension || sym->attr.pointer || sym->attr.allocatable)
-    value = build_fold_indirect_ref (se->expr);
+    value = build_fold_indirect_ref_loc (input_location,
+                                    se->expr);
   
   /* For character(*), use the actual argument's descriptor.  */  
-  else if (sym->ts.type == BT_CHARACTER && !new_sym->ts.cl->length)
-    value = build_fold_indirect_ref (se->expr);
+  else if (sym->ts.type == BT_CHARACTER && !new_sym->ts.u.cl->length)
+    value = build_fold_indirect_ref_loc (input_location,
+                                    se->expr);
 
   /* If the argument is an array descriptor, use it to determine
      information about the actual argument's shape.  */
@@ -1759,7 +1928,8 @@ gfc_add_interface_mapping (gfc_interface_mapping * mapping,
           && GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (TREE_TYPE (se->expr))))
     {
       /* Get the actual argument's descriptor.  */
-      desc = build_fold_indirect_ref (se->expr);
+      desc = build_fold_indirect_ref_loc (input_location,
+                                     se->expr);
 
       /* Create the replacement variable.  */
       tmp = gfc_conv_descriptor_data_get (desc);
@@ -1793,9 +1963,9 @@ gfc_finish_interface_mapping (gfc_interface_mapping * mapping,
 
   for (sym = mapping->syms; sym; sym = sym->next)
     if (sym->new_sym->n.sym->ts.type == BT_CHARACTER
-       && !sym->new_sym->n.sym->ts.cl->backend_decl)
+       && !sym->new_sym->n.sym->ts.u.cl->backend_decl)
       {
-       expr = sym->new_sym->n.sym->ts.cl->length;
+       expr = sym->new_sym->n.sym->ts.u.cl->length;
        gfc_apply_interface_mapping_to_expr (mapping, expr);
        gfc_init_se (&se, NULL);
        gfc_conv_expr (&se, expr);
@@ -1804,7 +1974,7 @@ gfc_finish_interface_mapping (gfc_interface_mapping * mapping,
        gfc_add_block_to_block (pre, &se.pre);
        gfc_add_block_to_block (post, &se.post);
 
-       sym->new_sym->n.sym->ts.cl->backend_decl = se.expr;
+       sym->new_sym->n.sym->ts.u.cl->backend_decl = se.expr;
       }
 }
 
@@ -1891,12 +2061,12 @@ gfc_map_intrinsic_function (gfc_expr *expr, gfc_interface_mapping *mapping)
     case GFC_ISYM_LEN:
       /* TODO figure out why this condition is necessary.  */
       if (sym->attr.function
-         && (arg1->ts.cl->length == NULL
-             || (arg1->ts.cl->length->expr_type != EXPR_CONSTANT
-                 && arg1->ts.cl->length->expr_type != EXPR_VARIABLE)))
+         && (arg1->ts.u.cl->length == NULL
+             || (arg1->ts.u.cl->length->expr_type != EXPR_CONSTANT
+                 && arg1->ts.u.cl->length->expr_type != EXPR_VARIABLE)))
        return false;
 
-      new_expr = gfc_copy_expr (arg1->ts.cl->length);
+      new_expr = gfc_copy_expr (arg1->ts.u.cl->length);
       break;
 
     case GFC_ISYM_SIZE:
@@ -2009,11 +2179,11 @@ gfc_map_fcn_formal_to_actual (gfc_expr *expr, gfc_expr *map_expr,
 
   if (map_expr->symtree->n.sym->ts.type == BT_CHARACTER)
     {
-      expr->value.function.esym->ts.cl->length
-       = gfc_copy_expr (map_expr->symtree->n.sym->ts.cl->length);
+      expr->value.function.esym->ts.u.cl->length
+       = gfc_copy_expr (map_expr->symtree->n.sym->ts.u.cl->length);
 
       gfc_apply_interface_mapping_to_expr (mapping,
-                       expr->value.function.esym->ts.cl->length);
+                       expr->value.function.esym->ts.u.cl->length);
     }
 }
 
@@ -2034,10 +2204,10 @@ gfc_apply_interface_mapping_to_expr (gfc_interface_mapping * mapping,
     return;
 
   /* Copying an expression does not copy its length, so do that here.  */
-  if (expr->ts.type == BT_CHARACTER && expr->ts.cl)
+  if (expr->ts.type == BT_CHARACTER && expr->ts.u.cl)
     {
-      expr->ts.cl = gfc_get_interface_mapping_charlen (mapping, expr->ts.cl);
-      gfc_apply_interface_mapping_to_expr (mapping, expr->ts.cl->length);
+      expr->ts.u.cl = gfc_get_interface_mapping_charlen (mapping, expr->ts.u.cl);
+      gfc_apply_interface_mapping_to_expr (mapping, expr->ts.u.cl->length);
     }
 
   /* Apply the mapping to any references.  */
@@ -2157,8 +2327,8 @@ gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
   gfc_conv_ss_startstride (&loop);
 
   /* Build an ss for the temporary.  */
-  if (expr->ts.type == BT_CHARACTER && !expr->ts.cl->backend_decl)
-    gfc_conv_string_length (expr->ts.cl, expr, &parmse->pre);
+  if (expr->ts.type == BT_CHARACTER && !expr->ts.u.cl->backend_decl)
+    gfc_conv_string_length (expr->ts.u.cl, expr, &parmse->pre);
 
   base_type = gfc_typenode_for_spec (&expr->ts);
   if (GFC_ARRAY_TYPE_P (base_type)
@@ -2170,7 +2340,7 @@ gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
   loop.temp_ss->data.temp.type = base_type;
 
   if (expr->ts.type == BT_CHARACTER)
-    loop.temp_ss->string_length = expr->ts.cl->backend_decl;
+    loop.temp_ss->string_length = expr->ts.u.cl->backend_decl;
   else
     loop.temp_ss->string_length = NULL;
 
@@ -2294,11 +2464,12 @@ gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
                           rse.loop->loopvar[0], offset);
 
   /* Now use the offset for the reference.  */
-  tmp = build_fold_indirect_ref (info->data);
+  tmp = build_fold_indirect_ref_loc (input_location,
+                                info->data);
   rse.expr = gfc_build_array_ref (tmp, tmp_index, NULL);
 
   if (expr->ts.type == BT_CHARACTER)
-    rse.string_length = expr->ts.cl->backend_decl;
+    rse.string_length = expr->ts.u.cl->backend_decl;
 
   gfc_conv_expr (&lse, expr);
 
@@ -2326,7 +2497,7 @@ gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
 
   /* Pass the string length to the argument expression.  */
   if (expr->ts.type == BT_CHARACTER)
-    parmse->string_length = expr->ts.cl->backend_decl;
+    parmse->string_length = expr->ts.u.cl->backend_decl;
 
   /* We want either the address for the data or the address of the descriptor,
      depending on the mode of passing array arguments.  */
@@ -2440,9 +2611,9 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
        }
       else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
        {
-         arg->expr->ts.type = sym->ts.derived->ts.type;
-         arg->expr->ts.f90_type = sym->ts.derived->ts.f90_type;
-         arg->expr->ts.kind = sym->ts.derived->ts.kind;
+         arg->expr->ts.type = sym->ts.u.derived->ts.type;
+         arg->expr->ts.f90_type = sym->ts.u.derived->ts.f90_type;
+         arg->expr->ts.kind = sym->ts.u.derived->ts.kind;
          gfc_conv_expr_reference (se, arg->expr);
       
          return 0;
@@ -2554,13 +2725,25 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
 
   gfc_init_block (&post);
   gfc_init_interface_mapping (&mapping);
-  need_interface_mapping = ((sym->ts.type == BT_CHARACTER
-                                 && sym->ts.cl->length
-                                 && sym->ts.cl->length->expr_type
-                                               != EXPR_CONSTANT)
-                             || (comp && comp->attr.dimension)
-                             || (!comp && sym->attr.dimension));
-  formal = sym->formal;
+  if (!comp)
+    {
+      formal = sym->formal;
+      need_interface_mapping = sym->attr.dimension ||
+                              (sym->ts.type == BT_CHARACTER
+                               && sym->ts.u.cl->length
+                               && sym->ts.u.cl->length->expr_type
+                                  != EXPR_CONSTANT);
+    }
+  else
+    {
+      formal = comp->formal;
+      need_interface_mapping = comp->attr.dimension ||
+                              (comp->ts.type == BT_CHARACTER
+                               && comp->ts.u.cl->length
+                               && comp->ts.u.cl->length->expr_type
+                                  != EXPR_CONSTANT);
+    }
+
   /* Evaluate the arguments.  */
   for (; arg != NULL; arg = arg->next, formal = formal ? formal->next : NULL)
     {
@@ -2590,6 +2773,57 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
                parmse.string_length = build_int_cst (gfc_charlen_type_node, 0);
            }
        }
+      else if (fsym && fsym->ts.type == BT_CLASS
+                && e->ts.type == BT_DERIVED)
+       {
+         tree data;
+         tree vindex;
+         tree size;
+
+         /* The derived type needs to be converted to a temporary
+            CLASS object.  */
+         gfc_init_se (&parmse, se);
+         type = gfc_typenode_for_spec (&fsym->ts);
+         var = gfc_create_var (type, "class");
+
+         /* Get the components.  */
+         tmp = fsym->ts.u.derived->components->backend_decl;
+         data = fold_build3 (COMPONENT_REF, TREE_TYPE (tmp),
+                             var, tmp, NULL_TREE);
+         tmp = fsym->ts.u.derived->components->next->backend_decl;
+         vindex = fold_build3 (COMPONENT_REF, TREE_TYPE (tmp),
+                               var, tmp, NULL_TREE);
+         tmp = fsym->ts.u.derived->components->next->next->backend_decl;
+         size = fold_build3 (COMPONENT_REF, TREE_TYPE (tmp),
+                             var, tmp, NULL_TREE);
+
+         /* Set the vindex.  */
+         tmp = build_int_cst (TREE_TYPE (vindex), e->ts.u.derived->vindex);
+         gfc_add_modify (&parmse.pre, vindex, tmp);
+
+         /* Set the size.  */
+         tmp = TYPE_SIZE_UNIT (gfc_typenode_for_spec (&e->ts));
+         gfc_add_modify (&parmse.pre, size,
+                         fold_convert (TREE_TYPE (size), tmp));
+
+         /* Now set the data field.  */
+         argss = gfc_walk_expr (e);
+         if (argss == gfc_ss_terminator)
+            {
+             gfc_conv_expr_reference (&parmse, e);
+             tmp = fold_convert (TREE_TYPE (data),
+                                 parmse.expr);
+             gfc_add_modify (&parmse.pre, data, tmp);
+           }
+         else
+           {
+             gfc_conv_expr (&parmse, e);
+             gfc_add_modify (&parmse.pre, data, parmse.expr);
+           }
+
+         /* Pass the address of the class object.  */
+         parmse.expr = gfc_build_addr_expr (NULL_TREE, var);
+       }
       else if (se->ss && se->ss->useflags)
        {
          /* An elemental function inside a scalarized loop.  */
@@ -2636,14 +2870,18 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
                   through arg->name.  */
                conv_arglist_function (&parmse, arg->expr, arg->name);
              else if ((e->expr_type == EXPR_FUNCTION)
-                         && e->symtree->n.sym->attr.pointer
-                         && fsym && fsym->attr.target)
+                       && ((e->value.function.esym
+                            && e->value.function.esym->result->attr.pointer)
+                           || (!e->value.function.esym
+                               && e->symtree->n.sym->attr.pointer))
+                       && fsym && fsym->attr.target)
                {
                  gfc_conv_expr (&parmse, e);
                  parmse.expr = gfc_build_addr_expr (NULL_TREE, parmse.expr);
                }
              else if (e->expr_type == EXPR_FUNCTION
                       && e->symtree->n.sym->result
+                      && e->symtree->n.sym->result != e->symtree->n.sym
                       && e->symtree->n.sym->result->attr.proc_pointer)
                {
                  /* Functions returning procedure pointers.  */
@@ -2654,12 +2892,46 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
              else
                {
                  gfc_conv_expr_reference (&parmse, e);
+
+                 /* If an ALLOCATABLE dummy argument has INTENT(OUT) and is 
+                    allocated on entry, it must be deallocated.  */
+                 if (fsym && fsym->attr.allocatable
+                     && fsym->attr.intent == INTENT_OUT)
+                   {
+                     stmtblock_t block;
+
+                     gfc_init_block  (&block);
+                     tmp = gfc_deallocate_with_status (parmse.expr, NULL_TREE,
+                                                       true, NULL);
+                     gfc_add_expr_to_block (&block, tmp);
+                     tmp = fold_build2 (MODIFY_EXPR, void_type_node,
+                                        parmse.expr, null_pointer_node);
+                     gfc_add_expr_to_block (&block, tmp);
+
+                     if (fsym->attr.optional
+                         && e->expr_type == EXPR_VARIABLE
+                         && e->symtree->n.sym->attr.optional)
+                       {
+                         tmp = fold_build3 (COND_EXPR, void_type_node,
+                                    gfc_conv_expr_present (e->symtree->n.sym),
+                                           gfc_finish_block (&block),
+                                           build_empty_stmt (input_location));
+                       }
+                     else
+                       tmp = gfc_finish_block (&block);
+
+                     gfc_add_expr_to_block (&se->pre, tmp);
+                   }
+
                  if (fsym && e->expr_type != EXPR_NULL
                      && ((fsym->attr.pointer
                           && fsym->attr.flavor != FL_PROCEDURE)
                          || (fsym->attr.proc_pointer
                              && !(e->expr_type == EXPR_VARIABLE
-                             && e->symtree->n.sym->attr.dummy))))
+                             && e->symtree->n.sym->attr.dummy))
+                         || (e->expr_type == EXPR_VARIABLE
+                             && gfc_is_proc_ptr_comp (e, NULL))
+                         || fsym->attr.allocatable))
                    {
                      /* Scalar pointer dummy args require an extra level of
                         indirection. The null pointer already contains
@@ -2695,16 +2967,22 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
                gfc_conv_array_parameter (&parmse, e, argss, f, fsym,
                                          sym->name, NULL);
 
-              /* If an ALLOCATABLE dummy argument has INTENT(OUT) and is 
-                 allocated on entry, it must be deallocated.  */
-              if (fsym && fsym->attr.allocatable
-                  && fsym->attr.intent == INTENT_OUT)
-                {
-                  tmp = build_fold_indirect_ref (parmse.expr);
-                  tmp = gfc_trans_dealloc_allocated (tmp);
-                  gfc_add_expr_to_block (&se->pre, tmp);
-                }
-
+             /* If an ALLOCATABLE dummy argument has INTENT(OUT) and is 
+                allocated on entry, it must be deallocated.  */
+             if (fsym && fsym->attr.allocatable
+                 && fsym->attr.intent == INTENT_OUT)
+               {
+                 tmp = build_fold_indirect_ref_loc (input_location,
+                                                    parmse.expr);
+                 tmp = gfc_trans_dealloc_allocated (tmp);
+                 if (fsym->attr.optional
+                     && e->expr_type == EXPR_VARIABLE
+                     && e->symtree->n.sym->attr.optional)
+                   tmp = fold_build3 (COND_EXPR, void_type_node,
+                                    gfc_conv_expr_present (e->symtree->n.sym),
+                                      tmp, build_empty_stmt (input_location));
+                 gfc_add_expr_to_block (&se->pre, tmp);
+               }
            } 
        }
 
@@ -2716,9 +2994,23 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
       if (e && (fsym == NULL || fsym->attr.optional))
        {
          /* If an optional argument is itself an optional dummy argument,
-            check its presence and substitute a null if absent.  */
+            check its presence and substitute a null if absent.  This is
+            only needed when passing an array to an elemental procedure
+            as then array elements are accessed - or no NULL pointer is
+            allowed and a "1" or "0" should be passed if not present.
+            When passing a non-array-descriptor full array to a
+            non-array-descriptor dummy, no check is needed. For
+            array-descriptor actual to array-descriptor dummy, see
+            PR 41911 for why a check has to be inserted.
+            fsym == NULL is checked as intrinsics required the descriptor
+            but do not always set fsym.  */
          if (e->expr_type == EXPR_VARIABLE
-             && e->symtree->n.sym->attr.optional)
+             && e->symtree->n.sym->attr.optional
+             && ((e->rank > 0 && sym->attr.elemental)
+                 || e->representation.length || e->ts.type == BT_CHARACTER
+                 || (e->rank > 0
+                     && (fsym == NULL || fsym->as->type == AS_ASSUMED_SHAPE
+                         || fsym->as->type == AS_DEFERRED))))
            gfc_conv_missing_dummy (&parmse, e, fsym ? fsym->ts : e->ts,
                                    e->representation.length);
        }
@@ -2731,11 +3023,11 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
              && parmse.string_length == NULL_TREE
              && e->ts.type == BT_PROCEDURE
              && e->symtree->n.sym->ts.type == BT_CHARACTER
-             && e->symtree->n.sym->ts.cl->length != NULL
-             && e->symtree->n.sym->ts.cl->length->expr_type == EXPR_CONSTANT)
+             && e->symtree->n.sym->ts.u.cl->length != NULL
+             && e->symtree->n.sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
            {
-             gfc_conv_const_charlen (e->symtree->n.sym->ts.cl);
-             parmse.string_length = e->symtree->n.sym->ts.cl->backend_decl;
+             gfc_conv_const_charlen (e->symtree->n.sym->ts.u.cl);
+             parmse.string_length = e->symtree->n.sym->ts.u.cl->backend_decl;
            }
        }
 
@@ -2749,12 +3041,13 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
         deallocated for non-variable scalars.  Non-variable arrays are
         dealt with in trans-array.c(gfc_conv_array_parameter).  */
       if (e && e->ts.type == BT_DERIVED
-           && e->ts.derived->attr.alloc_comp
+           && e->ts.u.derived->attr.alloc_comp
            && !(e->symtree && e->symtree->n.sym->attr.pointer)
            && (e->expr_type != EXPR_VARIABLE && !e->rank))
         {
          int parm_rank;
-         tmp = build_fold_indirect_ref (parmse.expr);
+         tmp = build_fold_indirect_ref_loc (input_location,
+                                        parmse.expr);
          parm_rank = e->rank;
          switch (parm_kind)
            {
@@ -2764,7 +3057,8 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
              break;
 
            case (SCALAR_POINTER):
-              tmp = build_fold_indirect_ref (tmp);
+              tmp = build_fold_indirect_ref_loc (input_location,
+                                            tmp);
              break;
            }
 
@@ -2774,11 +3068,11 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
            {
              tree local_tmp;
              local_tmp = gfc_evaluate_now (tmp, &se->pre);
-             local_tmp = gfc_copy_alloc_comp (e->ts.derived, local_tmp, tmp, parm_rank);
+             local_tmp = gfc_copy_alloc_comp (e->ts.u.derived, local_tmp, tmp, parm_rank);
              gfc_add_expr_to_block (&se->post, local_tmp);
            }
 
-         tmp = gfc_deallocate_alloc_comp (e->ts.derived, tmp, parm_rank);
+         tmp = gfc_deallocate_alloc_comp (e->ts.u.derived, tmp, parm_rank);
 
          gfc_add_expr_to_block (&se->post, tmp);
         }
@@ -2883,12 +3177,16 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
     }
   gfc_finish_interface_mapping (&mapping, &se->pre, &se->post);
 
-  ts = sym->ts;
+  if (comp)
+    ts = comp->ts;
+  else
+   ts = sym->ts;
+
   if (ts.type == BT_CHARACTER && sym->attr.is_bind_c)
     se->string_length = build_int_cst (gfc_charlen_type_node, 1);
   else if (ts.type == BT_CHARACTER)
     {
-      if (sym->ts.cl->length == NULL)
+      if (ts.u.cl->length == NULL)
        {
          /* Assumed character length results are not allowed by 5.1.1.5 of the
             standard and are trapped in resolve.c; except in the case of SPREAD
@@ -2903,19 +3201,19 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
              formal = sym->ns->proc_name->formal;
              for (; formal; formal = formal->next)
                if (strcmp (formal->sym->name, sym->name) == 0)
-                 cl.backend_decl = formal->sym->ts.cl->backend_decl;
+                 cl.backend_decl = formal->sym->ts.u.cl->backend_decl;
            }
         }
-        else
+      else
         {
          tree tmp;
 
          /* Calculate the length of the returned string.  */
          gfc_init_se (&parmse, NULL);
          if (need_interface_mapping)
-           gfc_apply_interface_mapping (&mapping, &parmse, sym->ts.cl->length);
+           gfc_apply_interface_mapping (&mapping, &parmse, ts.u.cl->length);
          else
-           gfc_conv_expr (&parmse, sym->ts.cl->length);
+           gfc_conv_expr (&parmse, ts.u.cl->length);
          gfc_add_block_to_block (&se->pre, &parmse.pre);
          gfc_add_block_to_block (&se->post, &parmse.post);
          
@@ -2928,12 +3226,12 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
       /* Set up a charlen structure for it.  */
       cl.next = NULL;
       cl.length = NULL;
-      ts.cl = &cl;
+      ts.u.cl = &cl;
 
       len = cl.backend_decl;
     }
 
-  byref = (comp && comp->attr.dimension)
+  byref = (comp && (comp->attr.dimension || comp->ts.type == BT_CHARACTER))
          || (!comp && gfc_return_by_reference (sym));
   if (byref)
     {
@@ -2945,7 +3243,8 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
                && TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))
                && GFC_DESCRIPTOR_TYPE_P
                        (TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))))
-           se->expr = build_fold_indirect_ref (se->expr);
+           se->expr = build_fold_indirect_ref_loc (input_location,
+                                               se->expr);
 
          retargs = gfc_chainon_list (retargs, se->expr);
        }
@@ -2973,7 +3272,7 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
          tmp = gfc_build_addr_expr (NULL_TREE, tmp);
          retargs = gfc_chainon_list (retargs, tmp);
        }
-      else if (sym->result->attr.dimension)
+      else if (!comp && sym->result->attr.dimension)
        {
          gcc_assert (se->loop && info);
 
@@ -3000,12 +3299,13 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
       else if (ts.type == BT_CHARACTER)
        {
          /* Pass the string length.  */
-         type = gfc_get_character_type (ts.kind, ts.cl);
+         type = gfc_get_character_type (ts.kind, ts.u.cl);
          type = build_pointer_type (type);
 
          /* Return an address to a char[0:len-1]* temporary for
             character pointers.  */
-         if (sym->attr.pointer || sym->attr.allocatable)
+         if ((!comp && (sym->attr.pointer || sym->attr.allocatable))
+              || (comp && (comp->attr.pointer || comp->attr.allocatable)))
            {
              var = gfc_create_var (type, "pstr");
 
@@ -3073,7 +3373,8 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
      where f is pointer valued, we have to dereference the result.  */
   if (!se->want_pointer && !byref && sym->attr.pointer
       && !gfc_is_proc_ptr_comp (expr, NULL))
-    se->expr = build_fold_indirect_ref (se->expr);
+    se->expr = build_fold_indirect_ref_loc (input_location,
+                                       se->expr);
 
   /* f2c calling conventions require a scalar default real function to
      return a double precision result.  Convert this back to default
@@ -3116,11 +3417,12 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
              /* Bundle in the string length.  */
              se->string_length = len;
            }
-         else if (sym->ts.type == BT_CHARACTER)
+         else if (ts.type == BT_CHARACTER)
            {
              /* Dereference for character pointer results.  */
-             if (sym->attr.pointer || sym->attr.allocatable)
-               se->expr = build_fold_indirect_ref (var);
+             if ((!comp && (sym->attr.pointer || sym->attr.allocatable))
+                 || (comp && (comp->attr.pointer || comp->attr.allocatable)))
+               se->expr = build_fold_indirect_ref_loc (input_location, var);
              else
                se->expr = var;
 
@@ -3128,8 +3430,8 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
            }
          else
            {
-             gcc_assert (sym->ts.type == BT_COMPLEX && gfc_option.flag_f2c);
-             se->expr = build_fold_indirect_ref (var);
+             gcc_assert (ts.type == BT_COMPLEX && gfc_option.flag_f2c);
+             se->expr = build_fold_indirect_ref_loc (input_location, var);
            }
        }
     }
@@ -3154,7 +3456,8 @@ fill_with_spaces (tree start, tree type, tree size)
 
   /* For a simple char type, we can call memset().  */
   if (compare_tree_int (TYPE_SIZE_UNIT (type), 1) == 0)
-    return build_call_expr (built_in_decls[BUILT_IN_MEMSET], 3, start,
+    return build_call_expr_loc (input_location,
+                           built_in_decls[BUILT_IN_MEMSET], 3, start,
                            build_int_cst (gfc_get_int_type (gfc_c_int_kind),
                                           lang_hooks.to_target_charset (' ')),
                            size);
@@ -3315,11 +3618,13 @@ gfc_trans_string_copy (stmtblock_t * block, tree dlength, tree dest,
 
   /* Truncate string if source is too long.  */
   cond2 = fold_build2 (GE_EXPR, boolean_type_node, slen, dlen);
-  tmp2 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
+  tmp2 = build_call_expr_loc (input_location,
+                         built_in_decls[BUILT_IN_MEMMOVE],
                          3, dest, src, dlen);
 
   /* Else copy and pad with spaces.  */
-  tmp3 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
+  tmp3 = build_call_expr_loc (input_location,
+                         built_in_decls[BUILT_IN_MEMMOVE],
                          3, dest, src, slen);
 
   tmp4 = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (dest), dest,
@@ -3388,8 +3693,8 @@ gfc_conv_statement_function (gfc_se * se, gfc_expr * expr)
          /* Copy string arguments.  */
           tree arglen;
 
-          gcc_assert (fsym->ts.cl && fsym->ts.cl->length
-                     && fsym->ts.cl->length->expr_type == EXPR_CONSTANT);
+          gcc_assert (fsym->ts.u.cl && fsym->ts.u.cl->length
+                     && fsym->ts.u.cl->length->expr_type == EXPR_CONSTANT);
 
           arglen = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
           tmp = gfc_build_addr_expr (build_pointer_type (type),
@@ -3426,22 +3731,22 @@ gfc_conv_statement_function (gfc_se * se, gfc_expr * expr)
 
   if (sym->ts.type == BT_CHARACTER)
     {
-      gfc_conv_const_charlen (sym->ts.cl);
+      gfc_conv_const_charlen (sym->ts.u.cl);
 
       /* Force the expression to the correct length.  */
       if (!INTEGER_CST_P (se->string_length)
          || tree_int_cst_lt (se->string_length,
-                             sym->ts.cl->backend_decl))
+                             sym->ts.u.cl->backend_decl))
        {
-         type = gfc_get_character_type (sym->ts.kind, sym->ts.cl);
+         type = gfc_get_character_type (sym->ts.kind, sym->ts.u.cl);
          tmp = gfc_create_var (type, sym->name);
          tmp = gfc_build_addr_expr (build_pointer_type (type), tmp);
-         gfc_trans_string_copy (&se->pre, sym->ts.cl->backend_decl, tmp,
+         gfc_trans_string_copy (&se->pre, sym->ts.u.cl->backend_decl, tmp,
                                 sym->ts.kind, se->string_length, se->expr,
                                 sym->ts.kind);
          se->expr = tmp;
        }
-      se->string_length = sym->ts.cl->backend_decl;
+      se->string_length = sym->ts.u.cl->backend_decl;
     }
 
   /* Restore the original variables.  */
@@ -3451,22 +3756,6 @@ gfc_conv_statement_function (gfc_se * se, gfc_expr * expr)
 }
 
 
-/* Return the backend_decl for a procedure pointer component.  */
-
-tree
-gfc_get_proc_ptr_comp (gfc_se *se, gfc_expr *e)
-{
-  gfc_se comp_se;
-  gfc_expr *e2;
-  gfc_init_se (&comp_se, NULL);
-  e2 = gfc_copy_expr (e);
-  e2->expr_type = EXPR_VARIABLE;
-  gfc_conv_expr (&comp_se, e2);
-  comp_se.expr = build_fold_addr_expr (comp_se.expr);
-  return gfc_evaluate_now (comp_se.expr, &se->pre);  
-}
-
-
 /* Translate a function expression.  */
 
 static void
@@ -3528,9 +3817,9 @@ gfc_conv_initializer (gfc_expr * expr, gfc_typespec * ts, tree type,
      used as initialization expressions).  If so, we need to modify
      the 'expr' to be that for a (void *).  */
   if (expr != NULL && expr->ts.type == BT_DERIVED
-      && expr->ts.is_iso_c && expr->ts.derived)
+      && expr->ts.is_iso_c && expr->ts.u.derived)
     {
-      gfc_symbol *derived = expr->ts.derived;
+      gfc_symbol *derived = expr->ts.u.derived;
 
       expr = gfc_int_expr (0);
 
@@ -3555,12 +3844,13 @@ gfc_conv_initializer (gfc_expr * expr, gfc_typespec * ts, tree type,
       switch (ts->type)
        {
        case BT_DERIVED:
+       case BT_CLASS:
          gfc_init_se (&se, NULL);
          gfc_conv_structure (&se, expr, 1);
          return se.expr;
 
        case BT_CHARACTER:
-         return gfc_conv_string_init (ts->cl->backend_decl,expr);
+         return gfc_conv_string_init (ts->u.cl->backend_decl,expr);
 
        default:
          gfc_init_se (&se, NULL);
@@ -3648,7 +3938,7 @@ gfc_trans_subarray_assign (tree dest, gfc_component * cm, gfc_expr * expr)
 
   gfc_conv_tmp_array_ref (&lse);
   if (cm->ts.type == BT_CHARACTER)
-    lse.string_length = cm->ts.cl->backend_decl;
+    lse.string_length = cm->ts.u.cl->backend_decl;
 
   gfc_conv_expr (&rse, expr);
 
@@ -3719,6 +4009,13 @@ gfc_trans_subcomponent_assign (tree dest, gfc_component * cm, gfc_expr * expr)
          gfc_add_block_to_block (&block, &se.post);
        }
     }
+  else if (cm->ts.type == BT_CLASS && expr->expr_type == EXPR_NULL)
+    {
+      /* NULL initialization for CLASS components.  */
+      tmp = gfc_trans_structure_assign (dest,
+                                       gfc_default_initializer (&cm->ts));
+      gfc_add_expr_to_block (&block, tmp);
+    }
   else if (cm->attr.dimension)
     {
       if (cm->attr.allocatable && expr->expr_type == EXPR_NULL)
@@ -3733,12 +4030,10 @@ gfc_trans_subcomponent_assign (tree dest, gfc_component * cm, gfc_expr * expr)
          se.want_pointer = 0;
          gfc_conv_expr_descriptor (&se, expr, rss);
          gfc_add_block_to_block (&block, &se.pre);
+         gfc_add_modify (&block, dest, se.expr);
 
-         tmp = fold_convert (TREE_TYPE (dest), se.expr);
-         gfc_add_modify (&block, dest, tmp);
-
-         if (cm->ts.type == BT_DERIVED && cm->ts.derived->attr.alloc_comp)
-           tmp = gfc_copy_alloc_comp (cm->ts.derived, se.expr, dest,
+         if (cm->ts.type == BT_DERIVED && cm->ts.u.derived->attr.alloc_comp)
+           tmp = gfc_copy_alloc_comp (cm->ts.u.derived, se.expr, dest,
                                       cm->as->rank);
          else
            tmp = gfc_duplicate_allocatable (dest, se.expr,
@@ -3843,7 +4138,7 @@ gfc_trans_subcomponent_assign (tree dest, gfc_component * cm, gfc_expr * expr)
 
       gfc_conv_expr (&se, expr);
       if (cm->ts.type == BT_CHARACTER)
-       lse.string_length = cm->ts.cl->backend_decl;
+       lse.string_length = cm->ts.u.cl->backend_decl;
       lse.expr = dest;
       tmp = gfc_trans_scalar_assign (&lse, &se, cm->ts, true, false);
       gfc_add_expr_to_block (&block, tmp);
@@ -3863,7 +4158,7 @@ gfc_trans_structure_assign (tree dest, gfc_expr * expr)
   tree tmp;
 
   gfc_start_block (&block);
-  cm = expr->ts.derived->components;
+  cm = expr->ts.u.derived->components;
   for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
     {
       /* Skip absent members in default initializers.  */
@@ -3899,13 +4194,13 @@ gfc_conv_structure (gfc_se * se, gfc_expr * expr, int init)
   if (!init)
     {
       /* Create a temporary variable and fill it in.  */
-      se->expr = gfc_create_var (type, expr->ts.derived->name);
+      se->expr = gfc_create_var (type, expr->ts.u.derived->name);
       tmp = gfc_trans_structure_assign (se->expr, expr);
       gfc_add_expr_to_block (&se->pre, tmp);
       return;
     }
 
-  cm = expr->ts.derived->components;
+  cm = expr->ts.u.derived->components;
 
   for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
     {
@@ -3916,12 +4211,26 @@ gfc_conv_structure (gfc_se * se, gfc_expr * expr, int init)
       if (!c->expr || cm->attr.allocatable)
         continue;
 
-      val = gfc_conv_initializer (c->expr, &cm->ts,
-         TREE_TYPE (cm->backend_decl), cm->attr.dimension,
-         cm->attr.pointer || cm->attr.proc_pointer);
+      if (cm->ts.type == BT_CLASS)
+       {
+         val = gfc_conv_initializer (c->expr, &cm->ts,
+             TREE_TYPE (cm->ts.u.derived->components->backend_decl),
+             cm->ts.u.derived->components->attr.dimension,
+             cm->ts.u.derived->components->attr.pointer);
+
+         /* Append it to the constructor list.  */
+         CONSTRUCTOR_APPEND_ELT (v, cm->ts.u.derived->components->backend_decl,
+                                 val);
+       }
+      else
+       {
+         val = gfc_conv_initializer (c->expr, &cm->ts,
+             TREE_TYPE (cm->backend_decl), cm->attr.dimension,
+             cm->attr.pointer || cm->attr.proc_pointer);
 
-      /* Append it to the constructor list.  */
-      CONSTRUCTOR_APPEND_ELT (v, cm->backend_decl, val);
+         /* Append it to the constructor list.  */
+         CONSTRUCTOR_APPEND_ELT (v, cm->backend_decl, val);
+       }
     }
   se->expr = build_constructor (type, v);
   if (init) 
@@ -3975,8 +4284,8 @@ gfc_conv_expr (gfc_se * se, gfc_expr * expr)
      null_pointer_node.  C_PTR and C_FUNPTR are converted to match the
      typespec for the C_PTR and C_FUNPTR symbols, which has already been
      updated to be an integer with a kind equal to the size of a (void *).  */
-  if (expr->ts.type == BT_DERIVED && expr->ts.derived
-      && expr->ts.derived->attr.is_iso_c)
+  if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
+      && expr->ts.u.derived->attr.is_iso_c)
     {
       if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
           || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
@@ -3989,9 +4298,9 @@ gfc_conv_expr (gfc_se * se, gfc_expr * expr)
         {
           /* Update the type/kind of the expression to be what the new
              type/kind are for the updated symbols of C_PTR/C_FUNPTR.  */
-          expr->ts.type = expr->ts.derived->ts.type;
-          expr->ts.f90_type = expr->ts.derived->ts.f90_type;
-          expr->ts.kind = expr->ts.derived->ts.kind;
+          expr->ts.type = expr->ts.u.derived->ts.type;
+          expr->ts.f90_type = expr->ts.u.derived->ts.f90_type;
+          expr->ts.kind = expr->ts.u.derived->ts.kind;
         }
     }
   
@@ -4113,8 +4422,12 @@ gfc_conv_expr_reference (gfc_se * se, gfc_expr * expr)
     }
 
   if (expr->expr_type == EXPR_FUNCTION
-       && expr->symtree->n.sym->attr.pointer
-       && !expr->symtree->n.sym->attr.dimension)
+      && ((expr->value.function.esym
+          && expr->value.function.esym->result->attr.pointer
+          && !expr->value.function.esym->result->attr.dimension)
+         || (!expr->value.function.esym
+             && expr->symtree->n.sym->attr.pointer
+             && !expr->symtree->n.sym->attr.dimension)))
     {
       se->want_pointer = 1;
       gfc_conv_expr (se, expr);
@@ -4189,18 +4502,22 @@ gfc_trans_pointer_assignment (gfc_expr * expr1, gfc_expr * expr2)
 
       if (expr1->symtree->n.sym->attr.proc_pointer
          && expr1->symtree->n.sym->attr.dummy)
-       lse.expr = build_fold_indirect_ref (lse.expr);
+       lse.expr = build_fold_indirect_ref_loc (input_location,
+                                           lse.expr);
 
       if (expr2->symtree && expr2->symtree->n.sym->attr.proc_pointer
          && expr2->symtree->n.sym->attr.dummy)
-       rse.expr = build_fold_indirect_ref (rse.expr);
+       rse.expr = build_fold_indirect_ref_loc (input_location,
+                                           rse.expr);
 
       gfc_add_block_to_block (&block, &lse.pre);
       gfc_add_block_to_block (&block, &rse.pre);
 
       /* Check character lengths if character expression.  The test is only
         really added if -fbounds-check is enabled.  */
-      if (expr1->ts.type == BT_CHARACTER && expr2->expr_type != EXPR_NULL)
+      if (expr1->ts.type == BT_CHARACTER && expr2->expr_type != EXPR_NULL
+         && !expr1->symtree->n.sym->attr.proc_pointer
+         && !gfc_is_proc_ptr_comp (expr1, NULL))
        {
          gcc_assert (expr2->ts.type == BT_CHARACTER);
          gcc_assert (lse.string_length && rse.string_length);
@@ -4358,7 +4675,7 @@ gfc_trans_scalar_assign (gfc_se * lse, gfc_se * rse, gfc_typespec ts,
       gfc_trans_string_copy (&block, llen, lse->expr, ts.kind, rlen,
                             rse->expr, ts.kind);
     }
-  else if (ts.type == BT_DERIVED && ts.derived->attr.alloc_comp)
+  else if (ts.type == BT_DERIVED && ts.u.derived->attr.alloc_comp)
     {
       cond = NULL_TREE;
        
@@ -4378,7 +4695,7 @@ gfc_trans_scalar_assign (gfc_se * lse, gfc_se * rse, gfc_typespec ts,
       if (!l_is_temp)
        {
          tmp = gfc_evaluate_now (lse->expr, &lse->pre);
-         tmp = gfc_deallocate_alloc_comp (ts.derived, tmp, 0);
+         tmp = gfc_deallocate_alloc_comp (ts.u.derived, tmp, 0);
          if (r_is_var)
            tmp = build3_v (COND_EXPR, cond, build_empty_stmt (input_location),
                            tmp);
@@ -4395,19 +4712,26 @@ gfc_trans_scalar_assign (gfc_se * lse, gfc_se * rse, gfc_typespec ts,
         same as the lhs.  */
       if (r_is_var)
        {
-         tmp = gfc_copy_alloc_comp (ts.derived, rse->expr, lse->expr, 0);
+         tmp = gfc_copy_alloc_comp (ts.u.derived, rse->expr, lse->expr, 0);
          tmp = build3_v (COND_EXPR, cond, build_empty_stmt (input_location),
                          tmp);
          gfc_add_expr_to_block (&block, tmp);
        }
     }
+  else if (ts.type == BT_DERIVED || ts.type == BT_CLASS)
+    {
+      gfc_add_block_to_block (&block, &lse->pre);
+      gfc_add_block_to_block (&block, &rse->pre);
+      tmp = fold_build1 (VIEW_CONVERT_EXPR, TREE_TYPE (lse->expr), rse->expr);
+      gfc_add_modify (&block, lse->expr, tmp);
+    }
   else
     {
       gfc_add_block_to_block (&block, &lse->pre);
       gfc_add_block_to_block (&block, &rse->pre);
 
       gfc_add_modify (&block, lse->expr,
-                          fold_convert (TREE_TYPE (lse->expr), rse->expr));
+                     fold_convert (TREE_TYPE (lse->expr), rse->expr));
     }
 
   gfc_add_block_to_block (&block, &lse->post);
@@ -4457,16 +4781,16 @@ gfc_trans_arrayfunc_assign (gfc_expr * expr1, gfc_expr * expr2)
      character lengths are the same.  */
   if (expr2->ts.type == BT_CHARACTER && expr2->rank > 0)
     {
-      if (expr1->ts.cl->length == NULL
-           || expr1->ts.cl->length->expr_type != EXPR_CONSTANT)
+      if (expr1->ts.u.cl->length == NULL
+           || expr1->ts.u.cl->length->expr_type != EXPR_CONSTANT)
        return NULL;
 
-      if (expr2->ts.cl->length == NULL
-           || expr2->ts.cl->length->expr_type != EXPR_CONSTANT)
+      if (expr2->ts.u.cl->length == NULL
+           || expr2->ts.u.cl->length->expr_type != EXPR_CONSTANT)
        return NULL;
 
-      if (mpz_cmp (expr1->ts.cl->length->value.integer,
-                    expr2->ts.cl->length->value.integer) != 0)
+      if (mpz_cmp (expr1->ts.u.cl->length->value.integer,
+                    expr2->ts.u.cl->length->value.integer) != 0)
        return NULL;
     }
 
@@ -4591,7 +4915,8 @@ gfc_trans_zero_assign (gfc_expr * expr)
   len = fold_convert (size_type_node, len);
 
   /* Construct call to __builtin_memset.  */
-  tmp = build_call_expr (built_in_decls[BUILT_IN_MEMSET],
+  tmp = build_call_expr_loc (input_location,
+                        built_in_decls[BUILT_IN_MEMSET],
                         3, dest, integer_zero_node, len);
   return fold_convert (void_type_node, tmp);
 }
@@ -4619,7 +4944,8 @@ gfc_build_memcpy_call (tree dst, tree src, tree len)
   len = fold_convert (size_type_node, len);
 
   /* Construct call to __builtin_memcpy.  */
-  tmp = build_call_expr (built_in_decls[BUILT_IN_MEMCPY], 3, dst, src, len);
+  tmp = build_call_expr_loc (input_location,
+                        built_in_decls[BUILT_IN_MEMCPY], 3, dst, src, len);
   return fold_convert (void_type_node, tmp);
 }
 
@@ -4722,7 +5048,7 @@ gfc_trans_array_constructor_copy (gfc_expr * expr1, gfc_expr * expr2)
 
 
 /* Subroutine of gfc_trans_assignment that actually scalarizes the
-   assignment.  EXPR1 is the destination/RHS and EXPR2 is the source/LHS.  */
+   assignment.  EXPR1 is the destination/LHS and EXPR2 is the source/RHS.  */
 
 static tree
 gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
@@ -4838,13 +5164,13 @@ gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
      to arrays must be done with a deep copy and the rhs temporary
      must have its components deallocated afterwards.  */
   scalar_to_array = (expr2->ts.type == BT_DERIVED
-                      && expr2->ts.derived->attr.alloc_comp
+                      && expr2->ts.u.derived->attr.alloc_comp
                       && expr2->expr_type != EXPR_VARIABLE
                       && !gfc_is_constant_expr (expr2)
                       && expr1->rank && !expr2->rank);
   if (scalar_to_array)
     {
-      tmp = gfc_deallocate_alloc_comp (expr2->ts.derived, rse.expr, 0);
+      tmp = gfc_deallocate_alloc_comp (expr2->ts.u.derived, rse.expr, 0);
       gfc_add_expr_to_block (&loop.post, tmp);
     }
 
@@ -4934,7 +5260,7 @@ copyable_array_p (gfc_expr * expr)
       return false;
 
     case BT_DERIVED:
-      return !expr->ts.derived->attr.alloc_comp;
+      return !expr->ts.u.derived->attr.alloc_comp;
 
     default:
       break;
@@ -5003,3 +5329,75 @@ gfc_trans_assign (gfc_code * code)
 {
   return gfc_trans_assignment (code->expr1, code->expr2, false);
 }
+
+
+/* Translate an assignment to a CLASS object
+   (pointer or ordinary assignment).  */
+
+tree
+gfc_trans_class_assign (gfc_code *code)
+{
+  stmtblock_t block;
+  tree tmp;
+
+  gfc_start_block (&block);
+
+  if (code->expr2->ts.type != BT_CLASS)
+    {
+      /* Insert an additional assignment which sets the '$vindex' field.  */
+      gfc_expr *lhs,*rhs;
+      lhs = gfc_copy_expr (code->expr1);
+      gfc_add_component_ref (lhs, "$vindex");
+      if (code->expr2->ts.type == BT_DERIVED)
+       /* vindex is constant, determined at compile time.  */
+       rhs = gfc_int_expr (code->expr2->ts.u.derived->vindex);
+      else if (code->expr2->expr_type == EXPR_NULL)
+       rhs = gfc_int_expr (0);
+      else
+       gcc_unreachable ();
+      tmp = gfc_trans_assignment (lhs, rhs, false);
+      gfc_add_expr_to_block (&block, tmp);
+
+      /* Insert another assignment which sets the '$size' field.  */
+      lhs = gfc_copy_expr (code->expr1);
+      gfc_add_component_ref (lhs, "$size");
+      if (code->expr2->ts.type == BT_DERIVED)
+       {
+         /* Size is fixed at compile time.  */
+         gfc_se lse;
+         gfc_init_se (&lse, NULL);
+         gfc_conv_expr (&lse, lhs);
+         tmp = TYPE_SIZE_UNIT (gfc_typenode_for_spec (&code->expr2->ts));
+         gfc_add_modify (&block, lse.expr,
+                         fold_convert (TREE_TYPE (lse.expr), tmp));
+       }
+      else if (code->expr2->expr_type == EXPR_NULL)
+       {
+         rhs = gfc_int_expr (0);
+         tmp = gfc_trans_assignment (lhs, rhs, false);
+         gfc_add_expr_to_block (&block, tmp);
+       }
+      else
+       gcc_unreachable ();
+
+      gfc_free_expr (lhs);
+      gfc_free_expr (rhs);
+    }
+
+  /* Do the actual CLASS assignment.  */
+  if (code->expr2->ts.type == BT_CLASS)
+    code->op = EXEC_ASSIGN;
+  else
+    gfc_add_component_ref (code->expr1, "$data");
+
+  if (code->op == EXEC_ASSIGN)
+    tmp = gfc_trans_assign (code);
+  else if (code->op == EXEC_POINTER_ASSIGN)
+    tmp = gfc_trans_pointer_assign (code);
+  else
+    gcc_unreachable();
+
+  gfc_add_expr_to_block (&block, tmp);
+
+  return gfc_finish_block (&block);
+}