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comparison src/share/vm/oops/constMethodOop.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_constMethodOop.cpp.incl"
27
28 // Static initialization
29 const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE;
30 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;
31
32 // How big must this constMethodObject be?
33
34 int constMethodOopDesc::object_size(int code_size,
35 int compressed_line_number_size,
36 int local_variable_table_length,
37 int checked_exceptions_length) {
38 int extra_bytes = code_size;
39 if (compressed_line_number_size > 0) {
40 extra_bytes += compressed_line_number_size;
41 }
42 if (checked_exceptions_length > 0) {
43 extra_bytes += sizeof(u2);
44 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
45 }
46 if (local_variable_table_length > 0) {
47 extra_bytes += sizeof(u2);
48 extra_bytes +=
49 local_variable_table_length * sizeof(LocalVariableTableElement);
50 }
51 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
52 return align_object_size(header_size() + extra_words);
53 }
54
55
56 // linenumber table - note that length is unknown until decompression,
57 // see class CompressedLineNumberReadStream.
58
59 u_char* constMethodOopDesc::compressed_linenumber_table() const {
60 // Located immediately following the bytecodes.
61 assert(has_linenumber_table(), "called only if table is present");
62 return code_end();
63 }
64
65 u2* constMethodOopDesc::checked_exceptions_length_addr() const {
66 // Located at the end of the constMethod.
67 assert(has_checked_exceptions(), "called only if table is present");
68 return last_u2_element();
69 }
70
71 u2* constMethodOopDesc::localvariable_table_length_addr() const {
72 assert(has_localvariable_table(), "called only if table is present");
73 if (has_checked_exceptions()) {
74 // If checked_exception present, locate immediately before them.
75 return (u2*) checked_exceptions_start() - 1;
76 } else {
77 // Else, the linenumber table is at the end of the constMethod.
78 return last_u2_element();
79 }
80 }
81
82
83 // Update the flags to indicate the presence of these optional fields.
84 void constMethodOopDesc::set_inlined_tables_length(
85 int checked_exceptions_len,
86 int compressed_line_number_size,
87 int localvariable_table_len) {
88 // Must be done in the order below, otherwise length_addr accessors
89 // will not work. Only set bit in header if length is positive.
90 assert(_flags == 0, "Error");
91 if (compressed_line_number_size > 0) {
92 _flags |= _has_linenumber_table;
93 }
94 if (checked_exceptions_len > 0) {
95 _flags |= _has_checked_exceptions;
96 *(checked_exceptions_length_addr()) = checked_exceptions_len;
97 }
98 if (localvariable_table_len > 0) {
99 _flags |= _has_localvariable_table;
100 *(localvariable_table_length_addr()) = localvariable_table_len;
101 }
102 }
103
104
105 int constMethodOopDesc::checked_exceptions_length() const {
106 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
107 }
108
109
110 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {
111 u2* addr = checked_exceptions_length_addr();
112 u2 length = *addr;
113 assert(length > 0, "should only be called if table is present");
114 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
115 return (CheckedExceptionElement*) addr;
116 }
117
118
119 int constMethodOopDesc::localvariable_table_length() const {
120 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
121 }
122
123
124 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {
125 u2* addr = localvariable_table_length_addr();
126 u2 length = *addr;
127 assert(length > 0, "should only be called if table is present");
128 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
129 return (LocalVariableTableElement*) addr;
130 }