+2016-01-19 Jan Hubicka <hubicka@ucw.cz>
+
+ PR ipa/66223
+ * ipa-devirt.c (is_cxa_pure_virtual_p): New function.
+ (maybe_record_node): Record cxa_pure_virtual as the only possible
+ target if there are not ohter candidates.
+ (possible_polymorphic_call_target_p): Accept cxa_pure_virtual.
+
2016-01-19 Richard Biener <rguenther@suse.de>
* hsa-gen.c (get_memory_order_name): Use MEMMODEL_ constants.
return found;
}
+/* Return if TARGET is cxa_pure_virtual. */
+
+static bool
+is_cxa_pure_virtual_p (tree target)
+{
+ return target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE
+ && DECL_NAME (target)
+ && !strcmp (IDENTIFIER_POINTER (DECL_NAME (target)),
+ "__cxa_pure_virtual");
+}
+
/* If TARGET has associated node, record it in the NODES array.
CAN_REFER specify if program can refer to the target directly.
if TARGET is unknown (NULL) or it can not be inserted (for example because
{
struct cgraph_node *target_node, *alias_target;
enum availability avail;
+ bool pure_virtual = is_cxa_pure_virtual_p (target);
- /* cxa_pure_virtual and __builtin_unreachable do not need to be added into
+ /* __builtin_unreachable do not need to be added into
list of targets; the runtime effect of calling them is undefined.
Only "real" virtual methods should be accounted. */
- if (target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE)
+ if (target && TREE_CODE (TREE_TYPE (target)) != METHOD_TYPE && !pure_virtual)
return;
if (!can_refer)
??? Maybe it would make sense to be more aggressive for LTO even
elsewhere. */
if (!flag_ltrans
+ && !pure_virtual
&& type_in_anonymous_namespace_p (DECL_CONTEXT (target))
&& (!target_node
|| !referenced_from_vtable_p (target_node)))
{
gcc_assert (!target_node->global.inlined_to);
gcc_assert (target_node->real_symbol_p ());
+ /* Only add pure virtual if it is the only possible target. This way
+ we will preserve the diagnostics about pure virtual called in many
+ cases without disabling optimization in other. */
+ if (pure_virtual)
+ {
+ if (nodes.length ())
+ return;
+ }
+ /* If we found a real target, take away cxa_pure_virtual. */
+ else if (!pure_virtual && nodes.length () == 1
+ && is_cxa_pure_virtual_p (nodes[0]->decl))
+ nodes.pop ();
+ if (pure_virtual && nodes.length ())
+ return;
if (!inserted->add (target))
{
cached_polymorphic_call_targets->add (target_node);
|| fcode == BUILT_IN_TRAP))
return true;
+ if (is_cxa_pure_virtual_p (n->decl))
+ return true;
+
if (!odr_hash)
return true;
targets = possible_polymorphic_call_targets (otr_type, otr_token, ctx, &final);