1/*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "interpreter/bytecodeStream.hpp"
27#include "interpreter/bytecodes.hpp"
28
29Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
30  assert(!is_last_bytecode(), "should have been checked");
31  // set next bytecode position
32  address bcp = RawBytecodeStream::bcp();
33  address end = method()->code_base() + end_bci();
34  int len = Bytecodes::raw_special_length_at(bcp, end);
35  // Very large tableswitch or lookupswitch size can cause _next_bci to overflow.
36  if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
37    code = Bytecodes::_illegal;
38  } else {
39    _next_bci += len;
40    // set attributes
41    _is_wide = false;
42    // check for special (uncommon) cases
43    if (code == Bytecodes::_wide) {
44      if (bcp + 1 >= end) {
45        code = Bytecodes::_illegal;
46      } else {
47        code = (Bytecodes::Code)bcp[1];
48        _is_wide = true;
49      }
50    }
51  }
52  _raw_code = code;
53  return code;
54}
55
56#ifdef ASSERT
57void BaseBytecodeStream::assert_raw_index_size(int size) const {
58  if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {
59    // in raw mode, pretend indy is "bJJ__"
60    assert(size == 2, "raw invokedynamic instruction has 2-byte index only");
61  } else {
62    bytecode().assert_index_size(size, raw_code(), is_wide());
63  }
64}
65
66void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {
67  if (want_raw) {
68    assert( is_raw(), "this function only works on raw streams");
69  } else {
70    assert(!is_raw(), "this function only works on non-raw streams");
71  }
72}
73#endif //ASSERT
74