Add a few missing checks that IPA_NODE_REF is not NULL (PR 92454)

2019-11-13  Jan Hubicka  <hubicka@ucw.cz>
	    Martin Jambor  <mjambor@suse.cz>

	PR ipa/92454
	* ipa-cp.c (spread_undeadness): Check that IPA_NODE_REF exists.
	(identify_dead_nodes): Likewise.

	testsuite/
	* g++.dg/ipa/pr92454.C: New test.

From-SVN: r278142

gcc/ChangeLog

+2019-11-13  Jan Hubicka  <hubicka@ucw.cz>
+	    Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/92454
+	* ipa-cp.c (spread_undeadness): Check that IPA_NODE_REF exists.
+	(identify_dead_nodes): Likewise.
+
 2019-11-13  Martin Liska  <mliska@suse.cz>
 
 	* ipa-icf.c (sem_function::equals_private): Do not overuse

gcc/ipa-cp.c

@@ -4979,7 +4979,7 @@ spread_undeadness (struct cgraph_node *node)
 	callee = cs->callee->function_symbol (NULL);
 	info = IPA_NODE_REF (callee);
 
-	if (info->node_dead)
+	if (info && info->node_dead)
 	  {
 	    info->node_dead = 0;
 	    spread_undeadness (callee);
@@ -5017,18 +5017,19 @@ identify_dead_nodes (struct cgraph_node *node)
   struct cgraph_node *v;
   for (v = node; v; v = ((struct ipa_dfs_info *) v->aux)->next_cycle)
     if (v->local
+	&& IPA_NODE_REF (v)
 	&& !v->call_for_symbol_thunks_and_aliases
 	     (has_undead_caller_from_outside_scc_p, NULL, true))
       IPA_NODE_REF (v)->node_dead = 1;
 
   for (v = node; v; v = ((struct ipa_dfs_info *) v->aux)->next_cycle)
-    if (!IPA_NODE_REF (v)->node_dead)
+    if (IPA_NODE_REF (v) && !IPA_NODE_REF (v)->node_dead)
       spread_undeadness (v);
 
   if (dump_file && (dump_flags & TDF_DETAILS))
     {
       for (v = node; v; v = ((struct ipa_dfs_info *) v->aux)->next_cycle)
-	if (IPA_NODE_REF (v)->node_dead)
+	if (IPA_NODE_REF (v) && IPA_NODE_REF (v)->node_dead)
 	  fprintf (dump_file, "  Marking node as dead: %s.\n", v->dump_name ());
     }
 }

gcc/testsuite/ChangeLog

+2019-11-13  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/92454
+	* ipa-cp.c (spread_undeadness): Check that IPA_NODE_REF exists.
+	(identify_dead_nodes): Likewise.
+
 2019-11-13  Martin Liska  <mliska@suse.cz>
 
 	* gcc.dg/ipa/ipa-icf-39.c: Update -fdbg-cnt to the new format.

gcc/testsuite/g++.dg/ipa/pr92454.C

+/* Originally PR ipa/91969, options adjusted for PR ipa/92454 */
+/* { dg-options "-O3 --param ipa-cp-eval-threshold=1" } */
+
+enum by
+{
+};
+class A
+{
+public:
+  class B
+  {
+  public:
+    virtual void m_fn2 (by) = 0;
+  };
+  virtual int m_fn1 ();
+  B *cf;
+};
+by a;
+class C : A, A::B
+{
+  void m_fn2 (by);
+};
+void C::m_fn2 (by) { cf->m_fn2 (a); }
+
+struct a
+{
+  virtual ~a ();
+};
+
+struct b
+{
+  virtual void d (...);
+};
+
+struct c : a, b
+{
+  void d (...) {}
+};