1 /*
 2  * Copyright (c) 2018, 2019, 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 #ifndef SHARE_OOPS_METHOD_INLINE_HPP
26 #define SHARE_OOPS_METHOD_INLINE_HPP
27 
28 #include "oops/method.hpp"
29 
30 #include "runtime/atomic.hpp"
31 
32 inline address Method::from_compiled_entry() const {
33   return Atomic::load_acquire(&_from_compiled_entry);
34 }
35 
36 inline address Method::from_interpreted_entry() const {
37   return Atomic::load_acquire(&_from_interpreted_entry);
38 }
39 
40 inline void Method::set_method_data(MethodData* data) {
41   // The store into method must be released. On platforms without
42   // total store order (TSO) the reference may become visible before
43   // the initialization of data otherwise.
44   Atomic::release_store(&_method_data, data);
45 }
46 
47 inline CompiledMethod* volatile Method::code() const {
48   assert( check_code(), "" );
49   return Atomic::load_acquire(&_code);
50 }
51 
52 // Write (bci, line number) pair to stream
53 inline void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
54   // bci and line number does not compress into single byte.
55   // Write out escape character and use regular compression for bci and line number.
56   write_byte((jubyte)0xFF);
57   write_signed_int(bci_delta);
58   write_signed_int(line_delta);
59 }
60 
61 inline void CompressedLineNumberWriteStream::write_pair_inline(int bci, int line) {
62   int bci_delta = bci - _bci;
63   int line_delta = line - _line;
64   _bci = bci;
65   _line = line;
66   // Skip (0,0) deltas - they do not add information and conflict with terminator.
67   if (bci_delta == 0 && line_delta == 0) return;
68   // Check if bci is 5-bit and line number 3-bit unsigned.
69   if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
70     // Compress into single byte.
71     jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
72     // Check that value doesn't match escape character.
73     if (value != 0xFF) {
74       write_byte(value);
75       return;
76     }
77   }
78   write_pair_regular(bci_delta, line_delta);
79 }
80 
81 inline void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
82   write_pair_inline(bci, line);
83 }
84 
85 inline bool Method::has_compiled_code() const { return code() != NULL; }
86 
87 inline bool Method::is_empty_method() const {
88   return  code_size() == 1
89       && *code_base() == Bytecodes::_return;
90 }
91 
92 #endif // SHARE_OOPS_METHOD_INLINE_HPP