[PATCH] hash: do not insert deleted value to a hash_set

[Martin Liška]

Hi.

After the new hash_set checking code, we face an issue where deleted value
is added to a hash_set. Fix it.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.

Ready to be installed?
Thanks,
Martin

        PR lto/108330

gcc/ChangeLog:

        * lto-cgraph.cc (compute_ltrans_boundary): Do not insert
        NULL (deleleted value) to a hash_set.

gcc/testsuite/ChangeLog:

        * g++.dg/ipa/pr108830.C: New test.
---
 gcc/lto-cgraph.cc                   |  3 ++-
 gcc/testsuite/g++.dg/ipa/pr108830.C | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/ipa/pr108830.C

diff --git a/gcc/lto-cgraph.cc b/gcc/lto-cgraph.cc
index eef5ea1d061..805c7855eb3 100644
--- a/gcc/lto-cgraph.cc
+++ b/gcc/lto-cgraph.cc
@@ -918,7 +918,8 @@ compute_ltrans_boundary (lto_symtab_encoder_t in_encoder)
              vec <cgraph_node *>targets
                = possible_polymorphic_call_targets
                    (edge, &final, &cache_token);
-             if (!reachable_call_targets.add (cache_token))
+             if (cache_token != NULL
+                 && !reachable_call_targets.add (cache_token))
                {
                  for (i = 0; i < targets.length (); i++)
                    {
diff --git a/gcc/testsuite/g++.dg/ipa/pr108830.C 
b/gcc/testsuite/g++.dg/ipa/pr108830.C
new file mode 100644
index 00000000000..96656f67e4f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/pr108830.C
@@ -0,0 +1,20 @@
+// PR lto/108330
+// { dg-do compile }
+
+class A {
+      virtual unsigned long m_fn1() const;
+        virtual int &m_fn2(unsigned long) const;
+};
+class C : A {
+public:
+      int &m_fn2(unsigned long) const;
+        unsigned long m_fn1() const;
+};
+class B {
+      void m_fn3(const A &, const int &, const C &, int &) const;
+};
+void B::m_fn3(const A &, const int &, const C &, int &) const {
+      C &a(a);
+        for (long b = 0; a.m_fn1(); b++)
+             a.m_fn2(0);
+}
--
2.39.0