[Patch, Fortran] Add end-of-scope finalization (Part 1 of 2)

[Tobias Burnus <burnus at net-b dot de>]

This patch extends the already existing end-of-scope finalization to 
nonallocatables.

Note: The patch only handles finalization of unsaved local variables 
whose type has a finalizer (including finalizable nonallocatable 
components or finalizers in the ancestor). In that case, the finalizer 
is invoked and also calls - where applicable - the finalizer of the 
allocatable components.

Part 2 will deal with derived-types with allocatable components which 
have finalizers (for the case that derived type itself has none). This 
requires a change to gfc_deallocate_alloc_comp, which will be done in 
part 2.

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

Best regards - and enjoy midsummer (the longest day - or the shortest if 
you are in the southern hemisphere),

Tobias

PS: Finalization overview:
Working (except part 2 of this patch set): Finalization for intent(out), 
end of scope, deallocate/allocate/move_alloc
Not working: Finalization of the LHS with intrinsic assignment and 
function results + structure/array constructors
2013-06-21  Tobias Burnus  <burnus@net-b.de>

	* trans-array.c (gfc_trans_deferred_array): Call the
	finalizer for nonallocatable local variables.
	* trans-decl.c (gfc_get_symbol_decl): Add local
	finalizable vars to the deferred list.
	(gfc_trans_deferred_vars): Call gfc_trans_deferred_array
	for those.

2013-06-21  Tobias Burnus  <burnus@net-b.de>

	* gfortran.dg/finalize_17.f90: New.

diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index a4321cc..96162e5 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -8307,12 +8309,12 @@ gfc_trans_deferred_array (gfc_symbol * sym, gfc_wrapped_block * block)
   sym_has_alloc_comp = (sym->ts.type == BT_DERIVED
 			|| sym->ts.type == BT_CLASS)
 			  && sym->ts.u.derived->attr.alloc_comp;
+  has_finalizer = sym->ts.type == BT_CLASS || sym->ts.type == BT_DERIVED
+		   ? gfc_is_finalizable (sym->ts.u.derived, NULL) : false;
 
   /* Make sure the frontend gets these right.  */
-  if (!(sym->attr.pointer || sym->attr.allocatable || sym_has_alloc_comp))
-    fatal_error ("Possible front-end bug: Deferred array size without pointer, "
-		 "allocatable attribute or derived type without allocatable "
-		 "components.");
+  gcc_assert (sym->attr.pointer || sym->attr.allocatable || sym_has_alloc_comp
+	      || has_finalizer);
 
   gfc_save_backend_locus (&loc);
   gfc_set_backend_locus (&sym->declared_at);
@@ -8341,7 +8343,7 @@ gfc_trans_deferred_array (gfc_symbol * sym, gfc_wrapped_block * block)
   /* Although static, derived types with default initializers and
      allocatable components must not be nulled wholesale; instead they
      are treated component by component.  */
-  if (TREE_STATIC (descriptor) && !sym_has_alloc_comp)
+  if (TREE_STATIC (descriptor) && !sym_has_alloc_comp && !has_finalizer)
     {
       /* SAVEd variables are not freed on exit.  */
       gfc_trans_static_array_pointer (sym);
@@ -8354,7 +8356,8 @@ gfc_trans_deferred_array (gfc_symbol * sym, gfc_wrapped_block * block)
   /* Get the descriptor type.  */
   type = TREE_TYPE (sym->backend_decl);
 
-  if (sym_has_alloc_comp && !(sym->attr.pointer || sym->attr.allocatable))
+  if ((sym_has_alloc_comp || (has_finalizer && sym->ts.type != BT_CLASS))
+      && !(sym->attr.pointer || sym->attr.allocatable))
     {
       if (!sym->attr.save
 	  && !(TREE_STATIC (sym->backend_decl) && sym->attr.is_main_program))
@@ -8389,9 +8392,17 @@ gfc_trans_deferred_array (gfc_symbol * sym, gfc_wrapped_block * block)
 
   /* Allocatable arrays need to be freed when they go out of scope.
      The allocatable components of pointers must not be touched.  */
-  has_finalizer = sym->ts.type == BT_CLASS || sym->ts.type == BT_DERIVED
-		   ? gfc_is_finalizable (sym->ts.u.derived, NULL) : false;
-  if ((!sym->attr.allocatable || !has_finalizer)
+  if (!sym->attr.allocatable && has_finalizer && sym->ts.type != BT_CLASS
+      && !sym->attr.pointer && !sym->attr.artificial && !sym->attr.save
+      && !sym->ns->proc_name->attr.is_main_program)
+    {
+      gfc_expr *e;
+      sym->attr.referenced = 1;
+      e = gfc_lval_expr_from_sym (sym);
+      gfc_add_finalizer_call (&cleanup, e);
+      gfc_free_expr (e);
+    }
+  else if ((!sym->attr.allocatable || !has_finalizer)
       && sym_has_alloc_comp && !(sym->attr.function || sym->attr.result)
       && !sym->attr.pointer && !sym->attr.save
       && !sym->ns->proc_name->attr.is_main_program)
diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 4e3bf48..fc3a725 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -1420,7 +1420,11 @@ gfc_get_symbol_decl (gfc_symbol * sym)
       || (sym->ts.type == BT_CLASS &&
 	  (CLASS_DATA (sym)->attr.dimension
 	   || CLASS_DATA (sym)->attr.allocatable))
-      || (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.alloc_comp)
+      || (sym->ts.type == BT_DERIVED
+	  && (sym->ts.u.derived->attr.alloc_comp
+	      || (!sym->attr.pointer && !sym->attr.artificial && !sym->attr.save
+		  && !sym->ns->proc_name->attr.is_main_program
+		  && gfc_is_finalizable (sym->ts.u.derived, NULL))))
       /* This applies a derived type default initializer.  */
       || (sym->ts.type == BT_DERIVED
 	  && sym->attr.save == SAVE_NONE
@@ -3668,8 +3672,10 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, gfc_wrapped_block * block)
 
   for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink)
     {
-      bool sym_has_alloc_comp = (sym->ts.type == BT_DERIVED)
-				   && sym->ts.u.derived->attr.alloc_comp;
+      bool alloc_comp_or_fini = (sym->ts.type == BT_DERIVED)
+				&& (sym->ts.u.derived->attr.alloc_comp
+				    || gfc_is_finalizable (sym->ts.u.derived,
+							   NULL));
       if (sym->assoc)
 	continue;
 
@@ -3754,7 +3760,7 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, gfc_wrapped_block * block)
 		  gfc_save_backend_locus (&loc);
 		  gfc_set_backend_locus (&sym->declared_at);
 
-		  if (sym_has_alloc_comp)
+		  if (alloc_comp_or_fini)
 		    {
 		      seen_trans_deferred_array = true;
 		      gfc_trans_deferred_array (sym, block);
@@ -3802,7 +3808,7 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, gfc_wrapped_block * block)
 	    default:
 	      gcc_unreachable ();
 	    }
-	  if (sym_has_alloc_comp && !seen_trans_deferred_array)
+	  if (alloc_comp_or_fini && !seen_trans_deferred_array)
 	    gfc_trans_deferred_array (sym, block);
 	}
       else if ((!sym->attr.dummy || sym->ts.deferred)
@@ -3998,7 +4004,7 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, gfc_wrapped_block * block)
 	}
       else if (sym->ts.deferred)
 	gfc_fatal_error ("Deferred type parameter not yet supported");
-      else if (sym_has_alloc_comp)
+      else if (alloc_comp_or_fini)
 	gfc_trans_deferred_array (sym, block);
       else if (sym->ts.type == BT_CHARACTER)
 	{
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index bd8886c..56dc766 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -7574,6 +7574,9 @@ alloc_scalar_allocatable_for_assignment (stmtblock_t *block,
       size_in_bytes = size;
     }
 
+  size_in_bytes = fold_build2_loc (input_location, MAX_EXPR, size_type_node,
+				   size_in_bytes, size_one_node);
+
   if (expr1->ts.type == BT_DERIVED && expr1->ts.u.derived->attr.alloc_comp)
     {
       tmp = build_call_expr_loc (input_location,
--- /dev/null	2013-06-21 09:21:05.672079164 +0200
+++ gcc/gcc/testsuite/gfortran.dg/finalize_17.f90	2013-06-21 14:22:34.772034565 +0200
@@ -0,0 +1,40 @@
+! { dg-do run }
+!
+! PR fortran/37336
+!
+! Test for finalization of nonallocatable variables
+!
+module m
+  implicit none
+  type t
+    integer :: i
+  contains
+    final :: finit
+  end type t
+  integer, save :: called_final = -1
+contains
+  impure elemental subroutine finit(x)
+    type(t), intent(in) :: x
+    if (called_final == -1) call abort ()
+    called_final = called_final + 1 
+    if (called_final /= x%i) call abort ()
+  end subroutine finit
+end module m
+
+  use m
+  implicit none
+  type(t) :: x2, y2(2)
+  block
+    type(t) :: xx, yy(2)
+    type(t), save :: x3, y3(2)
+    yy%i = [1, 2]
+    xx%i = 3
+    y3%i = [-4, -5]
+    x3%i = -6
+    called_final = 0
+  end block
+  if (called_final /= 3) call abort
+  called_final = -1
+  y2%i = [-7, -8]
+  x2%i = -9
+end