jdk

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/*
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 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "interpreter/bytecodeStream.hpp"
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#include "interpreter/bytecodes.hpp"
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#include "runtime/handles.inline.hpp"
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Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
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  assert(!is_last_bytecode(), "should have been checked");
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  // set next bytecode position
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  address bcp = RawBytecodeStream::bcp();
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  address end = method()->code_base() + end_bci();
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  int len = Bytecodes::raw_special_length_at(bcp, end);
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  // Very large tableswitch or lookupswitch size can cause _next_bci to overflow.
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  if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
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    code = Bytecodes::_illegal;
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  } else {
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    _next_bci += len;
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    // set attributes
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    _is_wide = false;
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    // check for special (uncommon) cases
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    if (code == Bytecodes::_wide) {
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      if (bcp + 1 >= end) {
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        code = Bytecodes::_illegal;
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      } else {
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        code = (Bytecodes::Code)bcp[1];
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        _is_wide = true;
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      }
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    }
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  }
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  _raw_code = code;
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  return code;
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}
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BaseBytecodeStream::BaseBytecodeStream(const methodHandle& method) : _method(method) {
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  set_interval(0, _method->code_size());
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  _is_raw = false;
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}
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#ifdef ASSERT
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void BaseBytecodeStream::assert_raw_index_size(int size) const {
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  if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {
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    // in raw mode, pretend indy is "bJJ__"
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    assert(size == 2, "raw invokedynamic instruction has 2-byte index only");
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  } else {
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    bytecode().assert_index_size(size, raw_code(), is_wide());
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  }
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}
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void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {
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  if (want_raw) {
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    assert( is_raw(), "this function only works on raw streams");
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  } else {
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    assert(!is_raw(), "this function only works on non-raw streams");
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  }
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}
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#endif //ASSERT
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