[PATCH] Fix PR ipa/65722

["Martin Liška" <mliska@suse.cz>]

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Hello.

Attached patch fixes PR, where we should consider just cgraph_nodes as
objects referred by virtual table.

Patch survives regression tests on x86_64-linux-pc with enabled checking.

Ready for trunk?
Thanks,
Martin

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From 8bff38438f6ba57732a6c3ccc3632f6789ca4d7e Mon Sep 17 00:00:00 2001
From: mliska <mliska@suse.cz>
Date: Fri, 10 Apr 2015 11:37:04 +0200
Subject: [PATCH] Fix PR ipa/65722.

gcc/testsuite/ChangeLog:

2015-04-10  Martin Liska  <mliska@suse.cz>

	* g++.dg/ipa/pr65722.C: New test.

gcc/ChangeLog:

2015-04-10  Martin Liska  <mliska@suse.cz>

	PR ipa/65722
	* ipa-icf.c (sem_variable::equals_wpa): Consider comparsion just
	for references coming from cgraph nodes.
---
 gcc/ipa-icf.c                      |  4 ++++
 gcc/testsuite/g++.dg/ipa/pr65722.C | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ipa/pr65722.C

diff --git a/gcc/ipa-icf.c b/gcc/ipa-icf.c
index 8f8a0cf..9e5d19c 100644
--- a/gcc/ipa-icf.c
+++ b/gcc/ipa-icf.c
@@ -1670,6 +1670,10 @@ sem_variable::equals_wpa (sem_item *item,
       /* DECL_FINAL_P flag on methods referred by virtual tables is used
 	 to decide on completeness possible_polymorphic_call_targets lists
 	 and therefore it must match.  */
+      if (!is_a <cgraph_node *> (ref->referred)
+	  || !is_a <cgraph_node *> (ref2->referred))
+	continue;
+
       if ((DECL_VIRTUAL_P (decl) || DECL_VIRTUAL_P (item->decl))
 	  && (DECL_VIRTUAL_P (ref->referred->decl)
 	      || DECL_VIRTUAL_P (ref2->referred->decl))
diff --git a/gcc/testsuite/g++.dg/ipa/pr65722.C b/gcc/testsuite/g++.dg/ipa/pr65722.C
new file mode 100644
index 0000000..ee4ea24
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/pr65722.C
@@ -0,0 +1,21 @@
+// { dg-do compile }
+// { dg-options "-O -fipa-icf -fno-rtti" }
+
+struct A
+{
+  virtual void f ()
+  {
+    __builtin_abort ();
+  }
+  virtual void g ();
+};
+
+struct B : virtual A { };
+struct C : B, virtual A { };
+
+void foo()
+{
+  C c;
+  C *p = &c;
+  p->f ();
+}
-- 
2.1.4