IPA: Avoid segfault in devirtualization_time_bonus (PR 93223)

2020-01-13  Martin Jambor  <mjambor@suse.cz>

	PR ipa/93223
	* ipa-cp.c (devirtualization_time_bonus): Check whether isummary is
	NULL.

	testsuite/
	* g++.dg/ipa/pr93223.C: New test.

gcc/ipa-cp.c

@@ -3158,7 +3158,7 @@ devirtualization_time_bonus (struct cgraph_node *node,
       if (avail < AVAIL_AVAILABLE)
 	continue;
       isummary = ipa_fn_summaries->get (callee);
-      if (!isummary->inlinable)
+      if (!isummary || !isummary->inlinable)
 	continue;
 
       int size = ipa_size_summaries->get (callee)->size;

gcc/testsuite/g++.dg/ipa/pr93223.C

+/* { dg-do compile } */
+/* { dg-options "-O3 -std=gnu++14" } */
+
+template <typename Function>
+bool run(const int item_count,
+         Function && process_range,
+         const int max_parallelism,
+         int* progress = nullptr)
+{
+    if (max_parallelism <= 1)
+    {
+        if (progress == nullptr)
+        {
+            return process_range(0);
+        }
+        else
+        {
+            auto result = true;
+            for (int i = 0; i != item_count && result; ++i)
+            {
+                (*progress)++;
+                result = process_range(i);
+            }
+            return result;
+        }
+    }
+
+    if (max_parallelism > 10)
+    {
+        if (progress == nullptr)
+        {
+            return process_range(0);
+        }
+        else
+        {
+            auto result = true;
+            for (int i = 0; i != item_count && result; ++i)
+            {
+                (*progress)++;
+                result = process_range(i);
+            }
+            return result;
+        }
+    }
+    return false;
+}
+
+namespace
+{
+__attribute__((optimize(0))) bool worker_fun(const int)
+{
+    return true;
+}
+}
+
+void demo(int n)
+{
+    for (int i = 0; i < n; ++i)
+    {
+        run(n, &worker_fun, n);
+    }
+}