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 "gc_implementation/shared/markSweep.inline.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "memory/gcLocker.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/constMethodKlass.hpp"
31 #include "oops/constMethodOop.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "oops/oop.inline2.hpp"
34 #include "runtime/handles.inline.hpp"
35
36
37 klassOop constMethodKlass::create_klass(TRAPS) {
38 constMethodKlass o;
39 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
40 KlassHandle k = base_create_klass(h_this_klass, header_size(),
41 o.vtbl_value(), CHECK_NULL);
42 // Make sure size calculation is right
43 assert(k()->size() == align_object_size(header_size()),
44 "wrong size for object");
45 //java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
46 return k();
47 }
48
49
50 int constMethodKlass::oop_size(oop obj) const {
51 assert(obj->is_constMethod(), "must be constMethod oop");
52 return constMethodOop(obj)->object_size();
53 }
54
55 bool constMethodKlass::oop_is_parsable(oop obj) const {
56 assert(obj->is_constMethod(), "must be constMethod oop");
57 return constMethodOop(obj)->object_is_parsable();
58 }
59
60 bool constMethodKlass::oop_is_conc_safe(oop obj) const {
61 assert(obj->is_constMethod(), "must be constMethod oop");
62 return constMethodOop(obj)->is_conc_safe();
63 }
64
65 constMethodOop constMethodKlass::allocate(int byte_code_size,
66 int compressed_line_number_size,
67 int localvariable_table_length,
68 int exception_table_length,
69 int checked_exceptions_length,
70 bool is_conc_safe,
71 TRAPS) {
72
73 int size = constMethodOopDesc::object_size(byte_code_size,
74 compressed_line_number_size,
75 localvariable_table_length,
76 exception_table_length,
77 checked_exceptions_length);
78 KlassHandle h_k(THREAD, as_klassOop());
79 constMethodOop cm = (constMethodOop)
80 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
81 assert(!cm->is_parsable(), "Not yet safely parsable");
82 No_Safepoint_Verifier no_safepoint;
83 cm->set_interpreter_kind(Interpreter::invalid);
84 cm->init_fingerprint();
85 cm->set_method(NULL);
86 cm->set_stackmap_data(NULL);
87 cm->set_code_size(byte_code_size);
88 cm->set_constMethod_size(size);
89 cm->set_inlined_tables_length(checked_exceptions_length,
90 compressed_line_number_size,
91 localvariable_table_length,
92 exception_table_length);
93 assert(cm->size() == size, "wrong size for object");
94 cm->set_is_conc_safe(is_conc_safe);
95 cm->set_partially_loaded();
96 assert(cm->is_parsable(), "Is safely parsable by gc");
97 return cm;
98 }
99
100 void constMethodKlass::oop_follow_contents(oop obj) {
101 assert (obj->is_constMethod(), "object must be constMethod");
102 constMethodOop cm = constMethodOop(obj);
103 MarkSweep::mark_and_push(cm->adr_method());
104 MarkSweep::mark_and_push(cm->adr_stackmap_data());
105 // Performance tweak: We skip iterating over the klass pointer since we
106 // know that Universe::constMethodKlassObj never moves.
107 }
108
109 #ifndef SERIALGC
110 void constMethodKlass::oop_follow_contents(ParCompactionManager* cm,
111 oop obj) {
112 assert (obj->is_constMethod(), "object must be constMethod");
113 constMethodOop cm_oop = constMethodOop(obj);
114 PSParallelCompact::mark_and_push(cm, cm_oop->adr_method());
115 PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());
116 // Performance tweak: We skip iterating over the klass pointer since we
117 // know that Universe::constMethodKlassObj never moves.
118 }
119 #endif // SERIALGC
120
121 int constMethodKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
122 assert (obj->is_constMethod(), "object must be constMethod");
123 constMethodOop cm = constMethodOop(obj);
124 blk->do_oop(cm->adr_method());
125 blk->do_oop(cm->adr_stackmap_data());
126 // Get size before changing pointers.
127 // Don't call size() or oop_size() since that is a virtual call.
128 int size = cm->object_size();
129 return size;
130 }
131
132
133 int constMethodKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
134 assert (obj->is_constMethod(), "object must be constMethod");
135 constMethodOop cm = constMethodOop(obj);
136 oop* adr;
137 adr = cm->adr_method();
138 if (mr.contains(adr)) blk->do_oop(adr);
139 adr = cm->adr_stackmap_data();
140 if (mr.contains(adr)) blk->do_oop(adr);
141 // Get size before changing pointers.
142 // Don't call size() or oop_size() since that is a virtual call.
143 int size = cm->object_size();
144 // Performance tweak: We skip iterating over the klass pointer since we
145 // know that Universe::constMethodKlassObj never moves.
146 return size;
147 }
148
149
150 int constMethodKlass::oop_adjust_pointers(oop obj) {
151 assert(obj->is_constMethod(), "should be constMethod");
152 constMethodOop cm = constMethodOop(obj);
153 MarkSweep::adjust_pointer(cm->adr_method());
154 MarkSweep::adjust_pointer(cm->adr_stackmap_data());
155 // Get size before changing pointers.
156 // Don't call size() or oop_size() since that is a virtual call.
157 int size = cm->object_size();
158 // Performance tweak: We skip iterating over the klass pointer since we
159 // know that Universe::constMethodKlassObj never moves.
160 return size;
161 }
162
163 #ifndef SERIALGC
164 void constMethodKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
165 assert(obj->is_constMethod(), "should be constMethod");
166 }
167
168 int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
169 assert(obj->is_constMethod(), "should be constMethod");
170 constMethodOop cm_oop = constMethodOop(obj);
171 oop* const beg_oop = cm_oop->oop_block_beg();
172 oop* const end_oop = cm_oop->oop_block_end();
173 for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
174 PSParallelCompact::adjust_pointer(cur_oop);
175 }
176 return cm_oop->object_size();
177 }
178 #endif // SERIALGC
179
180 // Printing
181
182 void constMethodKlass::oop_print_on(oop obj, outputStream* st) {
183 ResourceMark rm;
184 assert(obj->is_constMethod(), "must be constMethod");
185 Klass::oop_print_on(obj, st);
186 constMethodOop m = constMethodOop(obj);
187 st->print(" - method: " INTPTR_FORMAT " ", (address)m->method());
188 m->method()->print_value_on(st); st->cr();
189 if (m->has_stackmap_table()) {
190 st->print(" - stackmap data: ");
191 m->stackmap_data()->print_value_on(st);
192 st->cr();
193 }
194 }
195
196 // Short version of printing constMethodOop - just print the name of the
197 // method it belongs to.
198 void constMethodKlass::oop_print_value_on(oop obj, outputStream* st) {
199 assert(obj->is_constMethod(), "must be constMethod");
200 constMethodOop m = constMethodOop(obj);
201 st->print(" const part of method " );
202 m->method()->print_value_on(st);
203 }
204
205 const char* constMethodKlass::internal_name() const {
206 return "{constMethod}";
207 }
208
209
210 // Verification
211
212 void constMethodKlass::oop_verify_on(oop obj, outputStream* st) {
213 Klass::oop_verify_on(obj, st);
214 guarantee(obj->is_constMethod(), "object must be constMethod");
215 constMethodOop m = constMethodOop(obj);
216 guarantee(m->is_perm(), "should be in permspace");
217
218 // Verification can occur during oop construction before the method or
219 // other fields have been initialized.
220 if (!obj->partially_loaded()) {
221 guarantee(m->method()->is_perm(), "should be in permspace");
222 guarantee(m->method()->is_method(), "should be method");
223 typeArrayOop stackmap_data = m->stackmap_data();
224 guarantee(stackmap_data == NULL ||
225 stackmap_data->is_perm(), "should be in permspace");
226
227 address m_end = (address)((oop*) m + m->size());
228 address compressed_table_start = m->code_end();
229 guarantee(compressed_table_start <= m_end, "invalid method layout");
230 address compressed_table_end = compressed_table_start;
231 // Verify line number table
232 if (m->has_linenumber_table()) {
233 CompressedLineNumberReadStream stream(m->compressed_linenumber_table());
234 while (stream.read_pair()) {
235 guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table");
236 }
237 compressed_table_end += stream.position();
238 }
239 guarantee(compressed_table_end <= m_end, "invalid method layout");
240 // Verify checked exceptions, exception table and local variable tables
241 if (m->has_checked_exceptions()) {
242 u2* addr = m->checked_exceptions_length_addr();
243 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
244 }
245 if (m->has_exception_handler()) {
246 u2* addr = m->exception_table_length_addr();
247 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
248 }
249 if (m->has_localvariable_table()) {
250 u2* addr = m->localvariable_table_length_addr();
251 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
252 }
253 // Check compressed_table_end relative to uncompressed_table_start
254 u2* uncompressed_table_start;
255 if (m->has_localvariable_table()) {
256 uncompressed_table_start = (u2*) m->localvariable_table_start();
257 } else if (m->has_exception_handler()) {
258 uncompressed_table_start = (u2*) m->exception_table_start();
259 } else if (m->has_checked_exceptions()) {
260 uncompressed_table_start = (u2*) m->checked_exceptions_start();
261 } else {
262 uncompressed_table_start = (u2*) m_end;
263 }
264 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
265 int max_gap = align_object_size(1)*BytesPerWord;
266 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
267 }
268 }
269
270 bool constMethodKlass::oop_partially_loaded(oop obj) const {
271 assert(obj->is_constMethod(), "object must be klass");
272 constMethodOop m = constMethodOop(obj);
273 // check whether stackmap_data points to self (flag for partially loaded)
274 return m->stackmap_data() == (typeArrayOop)obj;
275 }
276
277
278 // The exception_table is the last field set when loading an object.
279 void constMethodKlass::oop_set_partially_loaded(oop obj) {
280 assert(obj->is_constMethod(), "object must be klass");
281 constMethodOop m = constMethodOop(obj);
282 // Temporarily set stackmap_data to point to self
283 m->set_stackmap_data((typeArrayOop)obj);
284 }