/*

 * Copyright (c) 2003, 2011, 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.

 *

 */

#include "precompiled.hpp"

#include "interpreter/interpreterRuntime.hpp"

#include "stack_zero.hpp"

#include "stack_zero.inline.hpp"

int ZeroStack::suggest_size(Thread *thread) const {

  assert(needs_setup(), "already set up");

  return align_size_down(abi_stack_available(thread) / 2, wordSize);

}

void ZeroStack::handle_overflow(TRAPS) {

  JavaThread *thread = (JavaThread *) THREAD;

  // Set up the frame anchor if it isn't already

  bool has_last_Java_frame = thread->has_last_Java_frame();

  if (!has_last_Java_frame) {

    intptr_t *sp = thread->zero_stack()->sp();

    ZeroFrame *frame = thread->top_zero_frame();

    while (frame) {

      if (frame->is_shark_frame())

        break;

      if (frame->is_interpreter_frame()) {

        interpreterState istate =

          frame->as_interpreter_frame()->interpreter_state();

        if (istate->self_link() == istate)

          break;

      }

      sp = ((intptr_t *) frame) + 1;

      frame = frame->next();

    }

    if (frame == NULL)

      fatal("unrecoverable stack overflow");

    thread->set_last_Java_frame(frame, sp);

  }

  // Throw the exception

  switch (thread->thread_state()) {

  case _thread_in_Java:

    InterpreterRuntime::throw_StackOverflowError(thread);

    break;

  case _thread_in_vm:

    Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__,

                                               methodHandle());

    break;

  default:

    ShouldNotReachHere();

  }

  // Reset the frame anchor if necessary

  if (!has_last_Java_frame)

    thread->reset_last_Java_frame();

}

#ifndef PRODUCT

void ZeroStack::zap(int c) {

  memset(_base, c, available_words() * wordSize);

}

#endif // PRODUCT