--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shenandoah/shenandoahNMethod.hpp Wed Nov 27 11:52:57 2019 -0500
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
+#define SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
+
+#include "code/nmethod.hpp"
+#include "gc/shenandoah/shenandoahHeap.hpp"
+#include "gc/shenandoah/shenandoahLock.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/growableArray.hpp"
+
+// ShenandoahNMethod tuple records the internal locations of oop slots within reclocation stream in
+// the nmethod. This allows us to quickly scan the oops without doing the nmethod-internal scans,
+// that sometimes involves parsing the machine code. Note it does not record the oops themselves,
+// because it would then require handling these tuples as the new class of roots.
+class ShenandoahNMethod : public CHeapObj<mtGC> {
+private:
+ nmethod* const _nm;
+ oop** _oops;
+ int _oops_count;
+ bool _has_non_immed_oops;
+ bool _unregistered;
+ ShenandoahReentrantLock _lock;
+
+public:
+ ShenandoahNMethod(nmethod *nm, GrowableArray<oop*>& oops, bool has_non_immed_oops);
+ ~ShenandoahNMethod();
+
+ inline nmethod* nm() const;
+ inline ShenandoahReentrantLock* lock();
+ void oops_do(OopClosure* oops, bool fix_relocations = false);
+ // Update oops when the nmethod is re-registered
+ void update();
+
+ bool has_cset_oops(ShenandoahHeap* heap);
+
+ inline int oop_count() const;
+ inline bool has_oops() const;
+
+ inline void mark_unregistered();
+ inline bool is_unregistered() const;
+
+ static ShenandoahNMethod* for_nmethod(nmethod* nm);
+ static inline ShenandoahReentrantLock* lock_for_nmethod(nmethod* nm);
+
+ static void heal_nmethod(nmethod* nm);
+ static inline void disarm_nmethod(nmethod* nm);
+
+ static inline ShenandoahNMethod* gc_data(nmethod* nm);
+ static inline void attach_gc_data(nmethod* nm, ShenandoahNMethod* gc_data);
+
+ void assert_alive_and_correct() NOT_DEBUG_RETURN;
+ void assert_same_oops(bool allow_dead = false) NOT_DEBUG_RETURN;
+ static void assert_no_oops(nmethod* nm, bool allow_dea = false) NOT_DEBUG_RETURN;
+
+private:
+ bool has_non_immed_oops() const { return _has_non_immed_oops; }
+ static void detect_reloc_oops(nmethod* nm, GrowableArray<oop*>& oops, bool& _has_non_immed_oops);
+};
+
+class ShenandoahNMethodTable;
+
+// An opaque snapshot of current nmethod table for iteration
+class ShenandoahNMethodTableSnapshot : public CHeapObj<mtGC> {
+ friend class ShenandoahNMethodTable;
+private:
+ ShenandoahHeap* const _heap;
+ ShenandoahNMethodTable* _table;
+ ShenandoahNMethod** const _array;
+ const int _length;
+
+ DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t));
+ volatile size_t _claimed;
+ DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
+
+public:
+ ShenandoahNMethodTableSnapshot(ShenandoahNMethodTable* table);
+
+ template<bool CSET_FILTER>
+ void parallel_blobs_do(CodeBlobClosure *f);
+
+ void concurrent_nmethods_do(NMethodClosure* cl);
+};
+
+class ShenandoahNMethodTable : public CHeapObj<mtGC> {
+ friend class ShenandoahNMethodTableSnapshot;
+private:
+ enum {
+ minSize = 1024
+ };
+
+ ShenandoahHeap* const _heap;
+ ShenandoahNMethod** _array;
+ int _size;
+ int _index;
+ ShenandoahLock _lock;
+ bool _iteration_in_progress;
+
+public:
+ ShenandoahNMethodTable();
+ ~ShenandoahNMethodTable();
+
+ void register_nmethod(nmethod* nm);
+ void unregister_nmethod(nmethod* nm);
+ void flush_nmethod(nmethod* nm);
+
+ bool contain(nmethod* nm) const;
+ int length() const { return _index; }
+
+ // Table iteration support
+ ShenandoahNMethodTableSnapshot* snapshot_for_iteration();
+ void finish_iteration(ShenandoahNMethodTableSnapshot* snapshot);
+
+ void assert_nmethods_alive_and_correct() NOT_DEBUG_RETURN;
+private:
+ // Rebuild table and replace current one
+ void rebuild(int size);
+
+ bool is_full() const {
+ assert(_index <= _size, "Sanity");
+ return _index == _size;
+ }
+
+ ShenandoahNMethod* at(int index) const;
+ int index_of(nmethod* nm) const;
+ void remove(int index);
+ void append(ShenandoahNMethod* snm);
+
+ inline bool iteration_in_progress() const;
+ void wait_until_concurrent_iteration_done();
+
+ // Logging support
+ void log_register_nmethod(nmethod* nm);
+ void log_unregister_nmethod(nmethod* nm);
+ void log_flush_nmethod(nmethod* nm);
+};
+
+class ShenandoahConcurrentNMethodIterator {
+private:
+ ShenandoahNMethodTable* const _table;
+ ShenandoahNMethodTableSnapshot* _table_snapshot;
+
+public:
+ ShenandoahConcurrentNMethodIterator(ShenandoahNMethodTable* table);
+
+ void nmethods_do_begin();
+ void nmethods_do(NMethodClosure* cl);
+ void nmethods_do_end();
+};
+
+#endif // SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP