New modref/ipa_modref optimization passes

[Jan Hubicka]

Hello,
this patch fixes the selftests and destructor issue noticed by David
(Malcolm).  According to David jit still crashes at different but I am
hitting different build failure in libjit that I will need to analyze
tomorrow.

Bootstrapped/regtested x86_64-linux, comitted.

	* ipa-modref-tree.c: Add namespace selftest.
	(modref_tree_c_tests): Rename to ...
	(ipa_modref_tree_c_tests): ... this.
	* ipa-modref.c (pass_modref): Remove destructor.
	(ipa_modref_c_finalize): New function.
	* ipa-modref.h (ipa_modref_c_finalize): Declare.
	* selftest-run-tests.c (selftest::run_tests): Call
	ipa_modref_c_finalize.
	* selftest.h (ipa_modref_tree_c_tests): Declare.
	* toplev.c: Include ipa-modref-tree.h and ipa-modref.h
	(toplev::finalize): Call ipa_modref_c_finalize.

diff --git a/gcc/ipa-modref-tree.c b/gcc/ipa-modref-tree.c
index e37dee67fa3..a84508a2268 100644
--- a/gcc/ipa-modref-tree.c
+++ b/gcc/ipa-modref-tree.c
@@ -28,6 +28,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #if CHECKING_P
 
+namespace selftest {
 
 static void
 test_insert_search_collapse ()
@@ -156,12 +157,14 @@ test_merge ()
 
 
 void
-modref_tree_c_tests ()
+ipa_modref_tree_c_tests ()
 {
   test_insert_search_collapse ();
   test_merge ();
 }
 
+} // namespace selftest
+
 #endif
 
 void
diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c
index af0b710333e..ac7579a9e75 100644
--- a/gcc/ipa-modref.c
+++ b/gcc/ipa-modref.c
@@ -767,12 +770,6 @@ class pass_modref : public gimple_opt_pass
     pass_modref (gcc::context *ctxt)
 	: gimple_opt_pass (pass_data_modref, ctxt) {}
 
-    ~pass_modref ()
-      {
-	ggc_delete (summaries);
-	summaries = NULL;
-      }
-
     /* opt_pass methods: */
     opt_pass *clone ()
     {
@@ -1373,4 +1370,14 @@ unsigned int pass_ipa_modref::execute (function *)
   return 0;
 }
 
+/* Summaries must stay alive until end of compilation.  */
+
+void
+ipa_modref_c_finalize ()
+{
+  if (summaries)
+    ggc_delete (summaries);
+  summaries = NULL;
+}
+
 #include "gt-ipa-modref.h"
diff --git a/gcc/ipa-modref.h b/gcc/ipa-modref.h
index 6f979200cc2..6cccdfe7af3 100644
--- a/gcc/ipa-modref.h
+++ b/gcc/ipa-modref.h
@@ -44,5 +44,6 @@ struct GTY(()) modref_summary
 };
 
 modref_summary *get_modref_function_summary (cgraph_node *func);
+void ipa_modref_c_finalize ();
 
 #endif
diff --git a/gcc/selftest-run-tests.c b/gcc/selftest-run-tests.c
index f0a81d43fd6..7a89b2df5bd 100644
--- a/gcc/selftest-run-tests.c
+++ b/gcc/selftest-run-tests.c
@@ -90,6 +90,7 @@ selftest::run_tests ()
   read_rtl_function_c_tests ();
   digraph_cc_tests ();
   tristate_cc_tests ();
+  ipa_modref_tree_c_tests ();
 
   /* Higher-level tests, or for components that other selftests don't
      rely on.  */
diff --git a/gcc/selftest.h b/gcc/selftest.h
index 5cffa13aedd..6c6c7f28675 100644
--- a/gcc/selftest.h
+++ b/gcc/selftest.h
@@ -268,6 +268,7 @@ extern void vec_perm_indices_c_tests ();
 extern void wide_int_cc_tests ();
 extern void opt_proposer_c_tests ();
 extern void dbgcnt_c_tests ();
+extern void ipa_modref_tree_c_tests ();
 
 extern int num_passes;
 
diff --git a/gcc/toplev.c b/gcc/toplev.c
index cdd4b5b4f92..a4cb8bb262e 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -84,6 +84,8 @@ along with GCC; see the file COPYING3.  If not see
 #include "dump-context.h"
 #include "print-tree.h"
 #include "optinfo-emit-json.h"
+#include "ipa-modref-tree.h"
+#include "ipa-modref.h"
 
 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
 #include "dbxout.h"
@@ -2497,6 +2499,7 @@ toplev::finalize (void)
   /* Needs to be called before cgraph_c_finalize since it uses symtab.  */
   ipa_reference_c_finalize ();
   ipa_fnsummary_c_finalize ();
+  ipa_modref_c_finalize ();
 
   cgraph_c_finalize ();
   cgraphunit_c_finalize ();