/*
 * Copyright (c) 2018, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */
 
#ifndef SHARE_VM_RUNTIME_CONTINUATION_HPP
#define SHARE_VM_RUNTIME_CONTINUATION_HPP

#include "runtime/globals.hpp"

#define CONT_FULL_STACK (!UseNewCode)

// The order of this struct matters as it's directly manipulated by assembly code (push/pop)
struct FrameInfo {
  address pc;
  intptr_t* fp;
  intptr_t* sp;
};

class Continuation : AllStatic {
private:
  static Method* _entry_method;
  static Method* entry_method(Thread*);

public:
  static void freeze(JavaThread* thread, FrameInfo* fi, int scopes);
  static int prepare_thaw(FrameInfo* fi, bool return_barrier);
  static void thaw(FrameInfo* fi, bool return_barrier);

  static bool is_continuation_entry_frame(const frame& f);
  static bool is_cont_bottom_frame(const frame& f);
  static bool is_return_barrier_entry(const address pc);
  static address sender_pc_past_barrier(JavaThread* thread, const frame& f);
  static address get_entry_pc_past_barrier(JavaThread* thread, const frame& f);
  static frame fix_continuation_bottom_sender(const frame& callee, frame f, RegisterMap* map);
};

void CONT_RegisterNativeMethods(JNIEnv *env, jclass cls);

#endif // SHARE_VM_RUNTIME_CONTINUATION_HPP