1 /*
2 * Copyright (c) 2003, 2012, 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 "oops/constMethodOop.hpp"
27 #include "oops/methodOop.hpp"
28
29 // Static initialization
30 const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE;
31 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;
32
33 // How big must this constMethodObject be?
34
35 int constMethodOopDesc::object_size(int code_size,
36 int compressed_line_number_size,
37 int local_variable_table_length,
38 int exception_table_length,
39 int checked_exceptions_length) {
40 int extra_bytes = code_size;
41 if (compressed_line_number_size > 0) {
42 extra_bytes += compressed_line_number_size;
43 }
44 if (checked_exceptions_length > 0) {
45 extra_bytes += sizeof(u2);
46 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
47 }
48 if (local_variable_table_length > 0) {
49 extra_bytes += sizeof(u2);
50 extra_bytes +=
51 local_variable_table_length * sizeof(LocalVariableTableElement);
52 }
53 if (exception_table_length > 0) {
54 extra_bytes += sizeof(u2);
55 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
56 }
57 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
58 return align_object_size(header_size() + extra_words);
59 }
60
61
62 // linenumber table - note that length is unknown until decompression,
63 // see class CompressedLineNumberReadStream.
64
65 u_char* constMethodOopDesc::compressed_linenumber_table() const {
66 // Located immediately following the bytecodes.
67 assert(has_linenumber_table(), "called only if table is present");
68 return code_end();
69 }
70
71 u2* constMethodOopDesc::checked_exceptions_length_addr() const {
72 // Located at the end of the constMethod.
73 assert(has_checked_exceptions(), "called only if table is present");
74 return last_u2_element();
75 }
76
77 u2* constMethodOopDesc::exception_table_length_addr() const {
78 assert(has_exception_handler(), "called only if table is present");
79 if (has_checked_exceptions()) {
80 // If checked_exception present, locate immediately before them.
81 return (u2*) checked_exceptions_start() - 1;
82 } else {
83 // Else, the exception table is at the end of the constMethod.
84 return last_u2_element();
85 }
86 }
87
88 u2* constMethodOopDesc::localvariable_table_length_addr() const {
89 assert(has_localvariable_table(), "called only if table is present");
90 if (has_exception_handler()) {
91 // If exception_table present, locate immediately before them.
92 return (u2*) exception_table_start() - 1;
93 } else {
94 if (has_checked_exceptions()) {
95 // If checked_exception present, locate immediately before them.
96 return (u2*) checked_exceptions_start() - 1;
97 } else {
98 // Else, the linenumber table is at the end of the constMethod.
99 return last_u2_element();
100 }
101 }
102 }
103
104
105 // Update the flags to indicate the presence of these optional fields.
106 void constMethodOopDesc::set_inlined_tables_length(
107 int checked_exceptions_len,
108 int compressed_line_number_size,
109 int localvariable_table_len,
110 int exception_table_len) {
111 // Must be done in the order below, otherwise length_addr accessors
112 // will not work. Only set bit in header if length is positive.
113 assert(_flags == 0, "Error");
114 if (compressed_line_number_size > 0) {
115 _flags |= _has_linenumber_table;
116 }
117 if (checked_exceptions_len > 0) {
118 _flags |= _has_checked_exceptions;
119 *(checked_exceptions_length_addr()) = checked_exceptions_len;
120 }
121 if (exception_table_len > 0) {
122 _flags |= _has_exception_table;
123 *(exception_table_length_addr()) = exception_table_len;
124 }
125 if (localvariable_table_len > 0) {
126 _flags |= _has_localvariable_table;
127 *(localvariable_table_length_addr()) = localvariable_table_len;
128 }
129 }
130
131
132 int constMethodOopDesc::checked_exceptions_length() const {
133 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
134 }
135
136
137 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {
138 u2* addr = checked_exceptions_length_addr();
139 u2 length = *addr;
140 assert(length > 0, "should only be called if table is present");
141 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
142 return (CheckedExceptionElement*) addr;
143 }
144
145
146 int constMethodOopDesc::localvariable_table_length() const {
147 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
148 }
149
150
151 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {
152 u2* addr = localvariable_table_length_addr();
153 u2 length = *addr;
154 assert(length > 0, "should only be called if table is present");
155 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
156 return (LocalVariableTableElement*) addr;
157 }
158
159 int constMethodOopDesc::exception_table_length() const {
160 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
161 }
162
163 ExceptionTableElement* constMethodOopDesc::exception_table_start() const {
164 u2* addr = exception_table_length_addr();
165 u2 length = *addr;
166 assert(length > 0, "should only be called if table is present");
167 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
168 return (ExceptionTableElement*)addr;
169 }