re PR fortran/33554 (Seg.fault: Default initialization of derived type uses uninitialized values)

2007-10-02  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/33554
	* trans-decl.c (init_intent_out_dt): New function.
	(gfc_trans_deferred_vars): Remove the code for default
	initialization of INTENT(OUT) derived types and put it
	in the new function.  Call it earlier than before, so
	that array offsets and lower bounds are available.

2007-10-02  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/33554
	* gfortran.dg/intent_out_2.f90: New test.

From-SVN: r128950

gcc/fortran/ChangeLog

 2007-10-02  Paul Thomas  <pault@gcc.gnu.org>
 
+	PR fortran/33554
+	* trans-decl.c (init_intent_out_dt): New function.
+	(gfc_trans_deferred_vars): Remove the code for default
+	initialization of INTENT(OUT) derived types and put it
+	in the new function.  Call it earlier than before, so
+	that array offsets and lower bounds are available.
+
+2007-10-02  Paul Thomas  <pault@gcc.gnu.org>
+
 	PR fortran/33550
 	* decl.c (get_proc_name): Return rc if rc is non-zero; ie. if
 	the name is a reference to an ambiguous symbol.

gcc/fortran/trans-decl.c

@@ -2558,6 +2558,44 @@ gfc_trans_vla_type_sizes (gfc_symbol *sym, stmtblock_t *body)
 }
 
 
+/* Initialize INTENT(OUT) derived type dummies.  */
+static tree
+init_intent_out_dt (gfc_symbol * proc_sym, tree body)
+{
+  stmtblock_t fnblock;
+  gfc_formal_arglist *f;
+  gfc_expr *tmpe;
+  tree tmp;
+  tree present;
+
+  gfc_init_block (&fnblock);
+
+  for (f = proc_sym->formal; f; f = f->next)
+    {
+      if (f->sym && f->sym->attr.intent == INTENT_OUT
+	    && f->sym->ts.type == BT_DERIVED
+	    && !f->sym->ts.derived->attr.alloc_comp
+	    && f->sym->value)
+	{
+	  gcc_assert (!f->sym->attr.allocatable);
+	  gfc_set_sym_referenced (f->sym);
+	  tmpe = gfc_lval_expr_from_sym (f->sym);
+	  tmp = gfc_trans_assignment (tmpe, f->sym->value, false);
+
+	  present = gfc_conv_expr_present (f->sym);
+	  tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present,
+			tmp, build_empty_stmt ());
+	  gfc_add_expr_to_block (&fnblock, tmp);
+	  gfc_free_expr (tmpe);
+	}
+    }
+
+  gfc_add_expr_to_block (&fnblock, body);
+  return gfc_finish_block (&fnblock);
+}
+
+
+
 /* Generate function entry and exit code, and add it to the function body.
    This includes:
     Allocation and initialization of array variables.
@@ -2612,6 +2650,11 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody)
 		    && proc_sym->ts.type == BT_COMPLEX);
     }
 
+  /* Initialize the INTENT(OUT) derived type dummy arguments.  This
+     should be done here so that the offsets and lbounds of arrays
+     are available.  */
+  fnbody = init_intent_out_dt (proc_sym, fnbody);
+
   for (sym = proc_sym->tlink; sym != proc_sym; sym = sym->tlink)
     {
       bool sym_has_alloc_comp = (sym->ts.type == BT_DERIVED)
@@ -2710,27 +2753,6 @@ gfc_trans_deferred_vars (gfc_symbol * proc_sym, tree fnbody)
 	  if (TREE_CODE (f->sym->ts.cl->backend_decl) == PARM_DECL)
 	    gfc_trans_vla_type_sizes (f->sym, &body);
 	}
-
-      /* If an INTENT(OUT) dummy of derived type has a default
-	 initializer, it must be initialized here.  */
-      if (f->sym && f->sym->attr.intent == INTENT_OUT
-	    && f->sym->ts.type == BT_DERIVED
-	    && !f->sym->ts.derived->attr.alloc_comp
-	    && f->sym->value)
-	{
-	  gfc_expr *tmpe;
-	  tree tmp, present;
-	  gcc_assert (!f->sym->attr.allocatable);
-	  gfc_set_sym_referenced (f->sym);
-	  tmpe = gfc_lval_expr_from_sym (f->sym);
-	  tmp = gfc_trans_assignment (tmpe, f->sym->value, false);
-
-	  present = gfc_conv_expr_present (f->sym);
-	  tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present,
-			tmp, build_empty_stmt ());
-	  gfc_add_expr_to_block (&body, tmp);
-	  gfc_free_expr (tmpe);
-	}
     }
 
   if (gfc_return_by_reference (proc_sym) && proc_sym->ts.type == BT_CHARACTER

gcc/testsuite/ChangeLog

 2007-10-02  Paul Thomas  <pault@gcc.gnu.org>
 
+	PR fortran/33554
+	* gfortran.dg/intent_out_2.f90: New test.
+
+2007-10-02  Paul Thomas  <pault@gcc.gnu.org>
+
 	PR fortran/33550
 	* gfortran.dg/ambiguous_reference_1.f90: New test.
 

gcc/testsuite/gfortran.dg/intent_out_2.f90

-! { dg-do -run }
+! { dg-do run }
 ! Tests the fix for PR33554, in which the default initialization
 ! of temp, in construct_temp, caused a segfault because it was
 ! being done before the array offset and lower bound were
 ! available.
 !
 ! Contributed by Harald Anlauf <anlauf@gmx.de> 
-!
-module gfcbug72
-  implicit none
-
-  type t_datum
-    character(len=8) :: mn = 'abcdefgh'
-  end type t_datum
-
-  type t_temp
-    type(t_datum) :: p
-  end type t_temp
-
-contains
-
-  subroutine setup ()
-    integer :: i
-    type (t_temp), pointer :: temp(:) => NULL ()
-
-    do i=1,2
-       allocate (temp (2))
-       call construct_temp (temp)
-       if (any (temp % p% mn .ne. 'ijklmnop')) call abort ()
-       deallocate (temp)
-    end do
-  end subroutine setup
-  !--
-  subroutine construct_temp (temp)
-    type (t_temp), intent(out) :: temp (:)
-    if (any (temp % p% mn .ne. 'abcdefgh')) call abort ()
-    temp(:)% p% mn = 'ijklmnop'
-  end subroutine construct_temp
-end module gfcbug72
-
-program test
-  use gfcbug72
-  implicit none
-  call setup ()
-end program test
+!
+module gfcbug72
+  implicit none
+
+  type t_datum
+    character(len=8) :: mn = 'abcdefgh'
+  end type t_datum
+
+  type t_temp
+    type(t_datum) :: p
+  end type t_temp
+
+contains
+
+  subroutine setup ()
+    integer :: i
+    type (t_temp), pointer :: temp(:) => NULL ()
+
+    do i=1,2
+       allocate (temp (2))
+       call construct_temp (temp)
+       if (any (temp % p% mn .ne. 'ijklmnop')) call abort ()
+       deallocate (temp)
+    end do
+  end subroutine setup
+  !--
+  subroutine construct_temp (temp)
+    type (t_temp), intent(out) :: temp (:)
+    if (any (temp % p% mn .ne. 'abcdefgh')) call abort ()
+    temp(:)% p% mn = 'ijklmnop'
+  end subroutine construct_temp
+end module gfcbug72
+
+program test
+  use gfcbug72
+  implicit none
+  call setup ()
+end program test
 ! { dg-final { cleanup-modules "gfcbug72" } }
-
+