/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * 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

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 *

 */

#ifndef SHARE_GC_SHARED_SCAVENGABLENMETHODS_HPP

#define SHARE_GC_SHARED_SCAVENGABLENMETHODS_HPP

#include "memory/allocation.hpp"

#include "utilities/macros.hpp"

class BoolObjectClosure;

class CodeBlobClosure;

class CodeBlobToOopClosure;

class nmethod;

class ScavengableNMethods : public AllStatic {

  friend class VMStructs;

  static nmethod*           _head;

  static BoolObjectClosure* _is_scavengable;

public:

  static void initialize(BoolObjectClosure* is_scavengable);

  static void register_nmethod(nmethod* nm);

  static void unregister_nmethod(nmethod* nm);

  static void verify_nmethod(nmethod* nm);

  static void flush_nmethod(nmethod* nm);

  static void prune_nmethods();

  // Apply f to every live code blob in scavengable nmethods. Prune nmethods

  // from the list of scavengable nmethods if f->fix_relocations() and a nmethod

  // no longer has scavengable oops.  If f->fix_relocations(), then f must copy

  // objects to their new location immediately to avoid fixing nmethods on the

  // basis of the old object locations.

  static void scavengable_nmethods_do(CodeBlobToOopClosure* f);

  static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;

private:

  static void unlist_nmethod(nmethod* nm, nmethod* prev);

  static bool has_scavengable_oops(nmethod* nm);

  static void mark_on_list_nmethods() PRODUCT_RETURN;

  static void verify_unlisted_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;

};

#endif // SHARE_GC_SHARED_SCAVENGABLENMETHODS_HPP