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class.c (layout_class_type): Put the fields required to make a class non-empty at the end... 

* class.c (layout_class_type): Put the fields required to make a
	class non-empty at the end, not the beginning, of the TYPE_FIELDs
	list.

From-SVN: r31603
This commit is contained in:
Mark Mitchell 2000-01-25 06:33:06 +00:00 committed by Mark Mitchell
parent 1865dbb5e2
commit 534170eb29
2 changed files with 24 additions and 7 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2000-01-24 Mark Mitchell <mark@codesourcery.com>
* class.c (layout_class_type): Put the fields required to make a
class non-empty at the end, not the beginning, of the TYPE_FIELDs
list.
2000-01-24 Jason Merrill <jason@casey.cygnus.com>
* pt.c (maybe_fold_nontype_arg): Do nothing if we're not in a

25
gcc/cp/class.c
View File

@ -4688,6 +4688,8 @@ layout_class_type (t, empty_p, has_virtual_p,
tree *new_virtuals_p;
tree *overridden_virtuals_p;
{
tree padding = NULL_TREE;
/* If possible, we reuse the virtual function table pointer from one
of our base classes. */
determine_primary_base (t, has_virtual_p);
@ -4712,15 +4714,17 @@ layout_class_type (t, empty_p, has_virtual_p,
have non-zero size. The field that we add here is fake, in the
sense that, for example, we don't want people to be able to
initialize it later. So, we add it just long enough to let the
back-end lay out the type, and then remove it. */
back-end lay out the type, and then remove it. In the new ABI,
the class may be empty even if it has basetypes. Therefore, we
add the fake field at the end of the fields list; if there are
already FIELD_DECLs on the list, their offsets will not be
disturbed. */
if (*empty_p)
{
tree decl = build_lang_decl
(FIELD_DECL, NULL_TREE, char_type_node);
TREE_CHAIN (decl) = TYPE_FIELDS (t);
TYPE_FIELDS (t) = decl;
padding = build_lang_decl (FIELD_DECL, NULL_TREE, char_type_node);
TYPE_FIELDS (t) = chainon (TYPE_FIELDS (t), padding);
TYPE_NONCOPIED_PARTS (t)
= tree_cons (NULL_TREE, decl, TYPE_NONCOPIED_PARTS (t));
= tree_cons (NULL_TREE, padding, TYPE_NONCOPIED_PARTS (t));
TREE_STATIC (TYPE_NONCOPIED_PARTS (t)) = 1;
}
@ -4734,7 +4738,14 @@ layout_class_type (t, empty_p, has_virtual_p,
/* If we added an extra field to make this class non-empty, remove
it now. */
if (*empty_p)
TYPE_FIELDS (t) = TREE_CHAIN (TYPE_FIELDS (t));
{
tree *declp;
declp = &TYPE_FIELDS (t);
while (*declp != padding)
declp = &TREE_CHAIN (*declp);
*declp = TREE_CHAIN (*declp);
}
/* Delete all zero-width bit-fields from the list of fields. Now
that the type is laid out they are no longer important. */