[Patch, Fortran, pr70397, v1] [5/6 Regression] ice while allocating ultimate polymorphic

[Andre Vehreschild <vehre@gmx.de>]

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Hi all,

here is the trunk version of the patch for the regression reported in
pr70397. Applying the gcc-5 patch to trunk lead to a regression, which
the modified patch resolves now. The technique to solve the ice is
the same as for gcc-5:

> The routine gfc_copy_class_to_class() assumed that both the source
> and destination object's type is unlimited polymorphic, but in this
> case it is true for the destination only, which made gfortran look
> for a non-existent _len component in the source object and therefore
> ICE. This is fixed by the patch by adding a function to return either
> the _len component, when it exists, or a constant zero node to init
> the destination object's _len component with.

Bootstrapped and regtested on x86_64-linux-gnu/F23. Ok for trunk?

Regards,
	Andre

PS: Yes, Paul, I know you accepted the patch for gcc-5 for trunk
also, but I feel safer when the changes made get additional approval.
-- 
Andre Vehreschild * Email: vehre ad gmx dot de 

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gcc/fortran/ChangeLog:

2016-03-27  Andre Vehreschild  <vehre@gcc.gnu.org>

	PR fortran/70397
	* trans-expr.c (gfc_class_len_or_zero_get): Add function to return a
	constant zero tree, when the class to get the _len component from is
	not unlimited polymorphic.
	(gfc_copy_class_to_class): Use the new function.
	* trans.h: Added interface of new function gfc_class_len_or_zero_get.

gcc/testsuite/ChangeLog:

2016-03-27  Andre Vehreschild  <vehre@gcc.gnu.org>

	PR fortran/70397
	* gfortran.dg/unlimited_polymorphic_25.f90: New test.
	* gfortran.dg/unlimited_polymorphic_26.f90: New test.



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diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index 4baadc8..8d039a6 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -173,6 +173,29 @@ gfc_class_len_get (tree decl)
 }
 
 
+/* Try to get the _len component of a class.  When the class is not unlimited
+   poly, i.e. no _len field exists, then return a zero node.  */
+
+tree
+gfc_class_len_or_zero_get (tree decl)
+{
+  tree len;
+  /* For class arrays decl may be a temporary descriptor handle, the vptr is
+     then available through the saved descriptor.  */
+  if (TREE_CODE (decl) == VAR_DECL && DECL_LANG_SPECIFIC (decl)
+      && GFC_DECL_SAVED_DESCRIPTOR (decl))
+    decl = GFC_DECL_SAVED_DESCRIPTOR (decl);
+  if (POINTER_TYPE_P (TREE_TYPE (decl)))
+    decl = build_fold_indirect_ref_loc (input_location, decl);
+  len = gfc_advance_chain (TYPE_FIELDS (TREE_TYPE (decl)),
+			   CLASS_LEN_FIELD);
+  return len != NULL_TREE ? fold_build3_loc (input_location, COMPONENT_REF,
+					     TREE_TYPE (len), decl, len,
+					     NULL_TREE)
+			  : integer_zero_node;
+}
+
+
 /* Get the specified FIELD from the VPTR.  */
 
 static tree
@@ -250,6 +273,7 @@ gfc_vptr_size_get (tree vptr)
 
 #undef CLASS_DATA_FIELD
 #undef CLASS_VPTR_FIELD
+#undef CLASS_LEN_FIELD
 #undef VTABLE_HASH_FIELD
 #undef VTABLE_SIZE_FIELD
 #undef VTABLE_EXTENDS_FIELD
@@ -1120,7 +1144,7 @@ gfc_copy_class_to_class (tree from, tree to, tree nelems, bool unlimited)
   if (unlimited)
     {
       if (from != NULL_TREE && unlimited)
-	from_len = gfc_class_len_get (from);
+	from_len = gfc_class_len_or_zero_get (from);
       else
 	from_len = integer_zero_node;
     }
diff --git a/gcc/fortran/trans.h b/gcc/fortran/trans.h
index add0cea..512615a 100644
--- a/gcc/fortran/trans.h
+++ b/gcc/fortran/trans.h
@@ -365,6 +365,7 @@ tree gfc_class_set_static_fields (tree, tree, tree);
 tree gfc_class_data_get (tree);
 tree gfc_class_vptr_get (tree);
 tree gfc_class_len_get (tree);
+tree gfc_class_len_or_zero_get (tree);
 gfc_expr * gfc_find_and_cut_at_last_class_ref (gfc_expr *);
 /* Get an accessor to the class' vtab's * field, when a class handle is
    available.  */
diff --git a/gcc/testsuite/gfortran.dg/unlimited_polymorphic_25.f90 b/gcc/testsuite/gfortran.dg/unlimited_polymorphic_25.f90
new file mode 100644
index 0000000..d0b2a2e
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/unlimited_polymorphic_25.f90
@@ -0,0 +1,40 @@
+! { dg-do run }
+!
+! Test contributed by Valery Weber  <valeryweber@hotmail.com>
+
+module mod
+
+  TYPE, PUBLIC :: base_type
+  END TYPE base_type
+
+  TYPE, PUBLIC :: dict_entry_type
+     CLASS( * ), ALLOCATABLE :: key
+     CLASS( * ), ALLOCATABLE :: val
+  END TYPE dict_entry_type
+
+
+contains
+
+  SUBROUTINE dict_put ( this, key, val )
+    CLASS(dict_entry_type), INTENT(INOUT)     :: this
+    CLASS(base_type), INTENT(IN)             :: key, val
+    INTEGER                                  :: istat
+    ALLOCATE( this%key, SOURCE=key, STAT=istat )
+  end SUBROUTINE dict_put
+end module mod
+
+program test
+  use mod
+  type(dict_entry_type) :: t
+  type(base_type) :: a, b
+  call dict_put(t, a, b)
+
+  if (.NOT. allocated(t%key)) call abort()
+  select type (x => t%key)
+    type is (base_type)
+    class default
+      call abort()
+  end select
+  deallocate(t%key)
+end
+
diff --git a/gcc/testsuite/gfortran.dg/unlimited_polymorphic_26.f90 b/gcc/testsuite/gfortran.dg/unlimited_polymorphic_26.f90
new file mode 100644
index 0000000..1300069
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/unlimited_polymorphic_26.f90
@@ -0,0 +1,47 @@
+! { dg-do run }
+!
+! Test contributed by Valery Weber  <valeryweber@hotmail.com>
+
+module mod
+
+  TYPE, PUBLIC :: dict_entry_type
+     CLASS( * ), ALLOCATABLE :: key
+     CLASS( * ), ALLOCATABLE :: val
+  END TYPE dict_entry_type
+
+
+contains
+
+  SUBROUTINE dict_put ( this, key, val )
+    CLASS(dict_entry_type), INTENT(INOUT)     :: this
+    CLASS(*), INTENT(IN)                     :: key, val
+    INTEGER                                  :: istat
+    ALLOCATE( this%key, SOURCE=key, STAT=istat )
+    ALLOCATE( this%val, SOURCE=val, STAT=istat )
+  end SUBROUTINE dict_put
+end module mod
+
+program test
+  use mod
+  type(dict_entry_type) :: t
+  call dict_put(t, "foo", 42)
+
+  if (.NOT. allocated(t%key)) call abort()
+  select type (x => t%key)
+    type is (CHARACTER(*))
+      if (x /= "foo") call abort()
+    class default
+      call abort()
+  end select
+  deallocate(t%key)
+
+  if (.NOT. allocated(t%val)) call abort()
+  select type (x => t%val)
+    type is (INTEGER)
+      if (x /= 42) call abort()
+    class default
+      call abort()
+  end select
+  deallocate(t%val)
+end
+