Mon, 25 Jun 2012 21:33:35 -0400
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
Summary: Cannot delete _buckets and HashtableEntries in shared space (CDS)
Reviewed-by: acorn, kvn, dlong, dcubed, kamg
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 */
25 #include "precompiled.hpp"
26 #include "oops/constMethodOop.hpp"
27 #include "oops/methodOop.hpp"
29 // Static initialization
30 const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE;
31 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;
33 // How big must this constMethodObject be?
35 int constMethodOopDesc::object_size(int code_size,
36 int compressed_line_number_size,
37 int local_variable_table_length,
38 int checked_exceptions_length) {
39 int extra_bytes = code_size;
40 if (compressed_line_number_size > 0) {
41 extra_bytes += compressed_line_number_size;
42 }
43 if (checked_exceptions_length > 0) {
44 extra_bytes += sizeof(u2);
45 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
46 }
47 if (local_variable_table_length > 0) {
48 extra_bytes += sizeof(u2);
49 extra_bytes +=
50 local_variable_table_length * sizeof(LocalVariableTableElement);
51 }
52 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
53 return align_object_size(header_size() + extra_words);
54 }
56 methodOop constMethodOopDesc::method() const {
57 return instanceKlass::cast(_constants->pool_holder())->method_with_idnum(
58 _method_idnum);
59 }
61 // linenumber table - note that length is unknown until decompression,
62 // see class CompressedLineNumberReadStream.
64 u_char* constMethodOopDesc::compressed_linenumber_table() const {
65 // Located immediately following the bytecodes.
66 assert(has_linenumber_table(), "called only if table is present");
67 return code_end();
68 }
70 u2* constMethodOopDesc::checked_exceptions_length_addr() const {
71 // Located at the end of the constMethod.
72 assert(has_checked_exceptions(), "called only if table is present");
73 return last_u2_element();
74 }
76 u2* constMethodOopDesc::localvariable_table_length_addr() const {
77 assert(has_localvariable_table(), "called only if table is present");
78 if (has_checked_exceptions()) {
79 // If checked_exception present, locate immediately before them.
80 return (u2*) checked_exceptions_start() - 1;
81 } else {
82 // Else, the linenumber table is at the end of the constMethod.
83 return last_u2_element();
84 }
85 }
88 // Update the flags to indicate the presence of these optional fields.
89 void constMethodOopDesc::set_inlined_tables_length(
90 int checked_exceptions_len,
91 int compressed_line_number_size,
92 int localvariable_table_len) {
93 // Must be done in the order below, otherwise length_addr accessors
94 // will not work. Only set bit in header if length is positive.
95 assert(_flags == 0, "Error");
96 if (compressed_line_number_size > 0) {
97 _flags |= _has_linenumber_table;
98 }
99 if (checked_exceptions_len > 0) {
100 _flags |= _has_checked_exceptions;
101 *(checked_exceptions_length_addr()) = checked_exceptions_len;
102 }
103 if (localvariable_table_len > 0) {
104 _flags |= _has_localvariable_table;
105 *(localvariable_table_length_addr()) = localvariable_table_len;
106 }
107 }
110 int constMethodOopDesc::checked_exceptions_length() const {
111 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
112 }
115 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {
116 u2* addr = checked_exceptions_length_addr();
117 u2 length = *addr;
118 assert(length > 0, "should only be called if table is present");
119 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
120 return (CheckedExceptionElement*) addr;
121 }
124 int constMethodOopDesc::localvariable_table_length() const {
125 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
126 }
129 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {
130 u2* addr = localvariable_table_length_addr();
131 u2 length = *addr;
132 assert(length > 0, "should only be called if table is present");
133 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
134 return (LocalVariableTableElement*) addr;
135 }