/*

 * Copyright (c) 1997, 2016, 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.

 *

 */

#include "precompiled.hpp"

#include "interpreter/bytecodeStream.hpp"

#include "interpreter/bytecodes.hpp"

Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {

  assert(!is_last_bytecode(), "should have been checked");

  // set next bytecode position

  address bcp = RawBytecodeStream::bcp();

  address end = method()->code_base() + end_bci();

  int len = Bytecodes::raw_special_length_at(bcp, end);

  // Very large tableswitch or lookupswitch size can cause _next_bci to overflow.

  if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {

    code = Bytecodes::_illegal;

  } else {

    _next_bci += len;

    // set attributes

    _is_wide = false;

    // check for special (uncommon) cases

    if (code == Bytecodes::_wide) {

      if (bcp + 1 >= end) {

        code = Bytecodes::_illegal;

      } else {

        code = (Bytecodes::Code)bcp[1];

        _is_wide = true;

      }

    }

  }

  _raw_code = code;

  return code;

}

#ifdef ASSERT

void BaseBytecodeStream::assert_raw_index_size(int size) const {

  if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {

    // in raw mode, pretend indy is "bJJ__"

    assert(size == 2, "raw invokedynamic instruction has 2-byte index only");

  } else {

    bytecode().assert_index_size(size, raw_code(), is_wide());

  }

}

void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {

  if (want_raw) {

    assert( is_raw(), "this function only works on raw streams");

  } else {

    assert(!is_raw(), "this function only works on non-raw streams");

  }

}

#endif //ASSERT