1 /*
2 * Copyright (c) 1997, 2018, 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 #include "runtime/handles.inline.hpp"
29
raw_next_special(Bytecodes::Code code)30 Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
31 assert(!is_last_bytecode(), "should have been checked");
32 // set next bytecode position
33 address bcp = RawBytecodeStream::bcp();
34 address end = method()->code_base() + end_bci();
35 int len = Bytecodes::raw_special_length_at(bcp, end);
36 // Very large tableswitch or lookupswitch size can cause _next_bci to overflow.
37 if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
38 code = Bytecodes::_illegal;
39 } else {
40 _next_bci += len;
41 // set attributes
42 _is_wide = false;
43 // check for special (uncommon) cases
44 if (code == Bytecodes::_wide) {
45 if (bcp + 1 >= end) {
46 code = Bytecodes::_illegal;
47 } else {
48 code = (Bytecodes::Code)bcp[1];
49 _is_wide = true;
50 }
51 }
52 }
53 _raw_code = code;
54 return code;
55 }
56
BaseBytecodeStream(const methodHandle & method)57 BaseBytecodeStream::BaseBytecodeStream(const methodHandle& method) : _method(method) {
58 set_interval(0, _method->code_size());
59 _is_raw = false;
60 }
61
62 #ifdef ASSERT
assert_raw_index_size(int size) const63 void BaseBytecodeStream::assert_raw_index_size(int size) const {
64 if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {
65 // in raw mode, pretend indy is "bJJ__"
66 assert(size == 2, "raw invokedynamic instruction has 2-byte index only");
67 } else {
68 bytecode().assert_index_size(size, raw_code(), is_wide());
69 }
70 }
71
assert_raw_stream(bool want_raw) const72 void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {
73 if (want_raw) {
74 assert( is_raw(), "this function only works on raw streams");
75 } else {
76 assert(!is_raw(), "this function only works on non-raw streams");
77 }
78 }
79 #endif //ASSERT
80