/*

 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2010 Red Hat, Inc.

 * 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 CPU_ZERO_VM_STACK_ZERO_INLINE_HPP

#define CPU_ZERO_VM_STACK_ZERO_INLINE_HPP

#include "runtime/thread.hpp"

#include "stack_zero.hpp"

// This function should match SharkStack::CreateStackOverflowCheck

inline void ZeroStack::overflow_check(int required_words, TRAPS) {

  // Check the Zero stack

  if (available_words() < required_words) {

    handle_overflow(THREAD);

    return;

  }

  // Check the ABI stack

  if (abi_stack_available(THREAD) < 0) {

    handle_overflow(THREAD);

    return;

  }

}

// This method returns the amount of ABI stack available for us

// to use under normal circumstances.  Note that the returned

// value can be negative.

inline int ZeroStack::abi_stack_available(Thread *thread) const {

  int stack_used = thread->stack_base() - (address) &stack_used;

  int stack_free = thread->stack_size() - stack_used;

  return stack_free - shadow_pages_size();

}

#endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP