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comparison src/share/vm/oops/constMethod.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/constMethodOop.cpp@8150fa46d2ed
children 4735d2c84362
comparison
equal deleted inserted replaced
6724:36d1d483d5d6 6725:da91efe96a93
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 "interpreter/interpreter.hpp"
27 #include "memory/gcLocker.hpp"
28 #include "memory/metadataFactory.hpp"
29 #include "oops/constMethod.hpp"
30 #include "oops/method.hpp"
31
32 // Static initialization
33 const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
34 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
35
36 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
37 int byte_code_size,
38 int compressed_line_number_size,
39 int localvariable_table_length,
40 int exception_table_length,
41 int checked_exceptions_length,
42 TRAPS) {
43 int size = ConstMethod::size(byte_code_size,
44 compressed_line_number_size,
45 localvariable_table_length,
46 exception_table_length,
47 checked_exceptions_length);
48 return new (loader_data, size, true, THREAD) ConstMethod(
49 byte_code_size, compressed_line_number_size,
50 localvariable_table_length, exception_table_length,
51 checked_exceptions_length, size);
52 }
53
54 ConstMethod::ConstMethod(int byte_code_size,
55 int compressed_line_number_size,
56 int localvariable_table_length,
57 int exception_table_length,
58 int checked_exceptions_length,
59 int size) {
60
61 No_Safepoint_Verifier no_safepoint;
62 set_interpreter_kind(Interpreter::invalid);
63 init_fingerprint();
64 set_constants(NULL);
65 set_stackmap_data(NULL);
66 set_code_size(byte_code_size);
67 set_constMethod_size(size);
68 set_inlined_tables_length(checked_exceptions_length,
69 compressed_line_number_size,
70 localvariable_table_length,
71 exception_table_length);
72 assert(this->size() == size, "wrong size for object");
73 }
74
75
76 // Deallocate metadata fields associated with ConstMethod*
77 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
78 set_interpreter_kind(Interpreter::invalid);
79 if (stackmap_data() != NULL) {
80 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
81 }
82 set_stackmap_data(NULL);
83 }
84
85 // How big must this constMethodObject be?
86
87 int ConstMethod::size(int code_size,
88 int compressed_line_number_size,
89 int local_variable_table_length,
90 int exception_table_length,
91 int checked_exceptions_length) {
92 int extra_bytes = code_size;
93 if (compressed_line_number_size > 0) {
94 extra_bytes += compressed_line_number_size;
95 }
96 if (checked_exceptions_length > 0) {
97 extra_bytes += sizeof(u2);
98 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
99 }
100 if (local_variable_table_length > 0) {
101 extra_bytes += sizeof(u2);
102 extra_bytes +=
103 local_variable_table_length * sizeof(LocalVariableTableElement);
104 }
105 if (exception_table_length > 0) {
106 extra_bytes += sizeof(u2);
107 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
108 }
109 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
110 return align_object_size(header_size() + extra_words);
111 }
112
113 Method* ConstMethod::method() const {
114 return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum(
115 _method_idnum);
116 }
117
118 // linenumber table - note that length is unknown until decompression,
119 // see class CompressedLineNumberReadStream.
120
121 u_char* ConstMethod::compressed_linenumber_table() const {
122 // Located immediately following the bytecodes.
123 assert(has_linenumber_table(), "called only if table is present");
124 return code_end();
125 }
126
127 u2* ConstMethod::checked_exceptions_length_addr() const {
128 // Located at the end of the constMethod.
129 assert(has_checked_exceptions(), "called only if table is present");
130 return last_u2_element();
131 }
132
133 u2* ConstMethod::exception_table_length_addr() const {
134 assert(has_exception_handler(), "called only if table is present");
135 if (has_checked_exceptions()) {
136 // If checked_exception present, locate immediately before them.
137 return (u2*) checked_exceptions_start() - 1;
138 } else {
139 // Else, the exception table is at the end of the constMethod.
140 return last_u2_element();
141 }
142 }
143
144 u2* ConstMethod::localvariable_table_length_addr() const {
145 assert(has_localvariable_table(), "called only if table is present");
146 if (has_exception_handler()) {
147 // If exception_table present, locate immediately before them.
148 return (u2*) exception_table_start() - 1;
149 } else {
150 if (has_checked_exceptions()) {
151 // If checked_exception present, locate immediately before them.
152 return (u2*) checked_exceptions_start() - 1;
153 } else {
154 // Else, the linenumber table is at the end of the constMethod.
155 return last_u2_element();
156 }
157 }
158 }
159
160
161 // Update the flags to indicate the presence of these optional fields.
162 void ConstMethod::set_inlined_tables_length(
163 int checked_exceptions_len,
164 int compressed_line_number_size,
165 int localvariable_table_len,
166 int exception_table_len) {
167 // Must be done in the order below, otherwise length_addr accessors
168 // will not work. Only set bit in header if length is positive.
169 assert(_flags == 0, "Error");
170 if (compressed_line_number_size > 0) {
171 _flags |= _has_linenumber_table;
172 }
173 if (checked_exceptions_len > 0) {
174 _flags |= _has_checked_exceptions;
175 *(checked_exceptions_length_addr()) = checked_exceptions_len;
176 }
177 if (exception_table_len > 0) {
178 _flags |= _has_exception_table;
179 *(exception_table_length_addr()) = exception_table_len;
180 }
181 if (localvariable_table_len > 0) {
182 _flags |= _has_localvariable_table;
183 *(localvariable_table_length_addr()) = localvariable_table_len;
184 }
185 }
186
187
188 int ConstMethod::checked_exceptions_length() const {
189 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
190 }
191
192
193 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
194 u2* addr = checked_exceptions_length_addr();
195 u2 length = *addr;
196 assert(length > 0, "should only be called if table is present");
197 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
198 return (CheckedExceptionElement*) addr;
199 }
200
201
202 int ConstMethod::localvariable_table_length() const {
203 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
204 }
205
206
207 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
208 u2* addr = localvariable_table_length_addr();
209 u2 length = *addr;
210 assert(length > 0, "should only be called if table is present");
211 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
212 return (LocalVariableTableElement*) addr;
213 }
214
215 int ConstMethod::exception_table_length() const {
216 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
217 }
218
219 ExceptionTableElement* ConstMethod::exception_table_start() const {
220 u2* addr = exception_table_length_addr();
221 u2 length = *addr;
222 assert(length > 0, "should only be called if table is present");
223 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
224 return (ExceptionTableElement*)addr;
225 }
226
227
228 // Printing
229
230 void ConstMethod::print_on(outputStream* st) const {
231 ResourceMark rm;
232 assert(is_constMethod(), "must be constMethod");
233 st->print_cr(internal_name());
234 st->print(" - method: " INTPTR_FORMAT " ", (address)method());
235 method()->print_value_on(st); st->cr();
236 if (has_stackmap_table()) {
237 st->print(" - stackmap data: ");
238 stackmap_data()->print_value_on(st);
239 st->cr();
240 }
241 }
242
243 // Short version of printing ConstMethod* - just print the name of the
244 // method it belongs to.
245 void ConstMethod::print_value_on(outputStream* st) const {
246 assert(is_constMethod(), "must be constMethod");
247 st->print(" const part of method " );
248 method()->print_value_on(st);
249 }
250
251
252 // Verification
253
254 void ConstMethod::verify_on(outputStream* st) {
255 guarantee(is_constMethod(), "object must be constMethod");
256 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
257
258 // Verification can occur during oop construction before the method or
259 // other fields have been initialized.
260 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
261 guarantee(method()->is_method(), "should be method");
262
263 address m_end = (address)((oop*) this + size());
264 address compressed_table_start = code_end();
265 guarantee(compressed_table_start <= m_end, "invalid method layout");
266 address compressed_table_end = compressed_table_start;
267 // Verify line number table
268 if (has_linenumber_table()) {
269 CompressedLineNumberReadStream stream(compressed_linenumber_table());
270 while (stream.read_pair()) {
271 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
272 }
273 compressed_table_end += stream.position();
274 }
275 guarantee(compressed_table_end <= m_end, "invalid method layout");
276 // Verify checked exceptions, exception table and local variable tables
277 if (has_checked_exceptions()) {
278 u2* addr = checked_exceptions_length_addr();
279 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
280 }
281 if (has_exception_handler()) {
282 u2* addr = exception_table_length_addr();
283 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
284 }
285 if (has_localvariable_table()) {
286 u2* addr = localvariable_table_length_addr();
287 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
288 }
289 // Check compressed_table_end relative to uncompressed_table_start
290 u2* uncompressed_table_start;
291 if (has_localvariable_table()) {
292 uncompressed_table_start = (u2*) localvariable_table_start();
293 } else if (has_exception_handler()) {
294 uncompressed_table_start = (u2*) exception_table_start();
295 } else if (has_checked_exceptions()) {
296 uncompressed_table_start = (u2*) checked_exceptions_start();
297 } else {
298 uncompressed_table_start = (u2*) m_end;
299 }
300 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
301 int max_gap = align_object_size(1)*BytesPerWord;
302 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
303 }