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 "cds/cdsConfig.hpp"
26 #include "cds/metaspaceShared.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "jvmtifiles/jvmti.h"
33 #include "memory/metaspaceClosure.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "memory/universe.hpp"
36 #include "oops/arrayKlass.inline.hpp"
37 #include "oops/arrayOop.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/klass.inline.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/handles.inline.hpp"
43
44 void* ArrayKlass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
45 return Metaspace::allocate(loader_data, word_size, MetaspaceObj::ClassType, true, THREAD);
46 }
47
48 ArrayKlass::ArrayKlass() {
49 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
50 }
51
52 int ArrayKlass::static_size(int header_size) {
53 // size of an array klass object
54 assert(header_size <= InstanceKlass::header_size(), "bad header size");
55 // If this assert fails, see comments in base_create_array_klass.
56 header_size = InstanceKlass::header_size();
57 int vtable_len = Universe::base_vtable_size();
58 int size = header_size + vtable_len;
59 return align_metadata_size(size);
60 }
61
75
76 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
77 Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
78 // There are no fields in an array klass but look to the super class (Object)
79 assert(super(), "super klass must be present");
80 return super()->find_field(name, sig, fd);
81 }
82
83 Method* ArrayKlass::uncached_lookup_method(const Symbol* name,
84 const Symbol* signature,
85 OverpassLookupMode overpass_mode,
86 PrivateLookupMode private_mode) const {
87 // There are no methods in an array klass but the super class (Object) has some
88 assert(super(), "super klass must be present");
89 // Always ignore overpass methods in superclasses, although technically the
90 // super klass of an array, (j.l.Object) should not have
91 // any overpass methods present.
92 return super()->uncached_lookup_method(name, signature, OverpassLookupMode::skip, private_mode);
93 }
94
95 ArrayKlass::ArrayKlass(Symbol* name, KlassKind kind) :
96 Klass(kind),
97 _dimension(1),
98 _higher_dimension(nullptr),
99 _lower_dimension(nullptr) {
100 // Arrays don't add any new methods, so their vtable is the same size as
101 // the vtable of klass Object.
102 set_vtable_length(Universe::base_vtable_size());
103 set_name(name);
104 set_super(Universe::is_bootstrapping() ? nullptr : vmClasses::Object_klass());
105 set_layout_helper(Klass::_lh_neutral_value);
106 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
107 JFR_ONLY(INIT_ID(this);)
108 log_array_class_load(this);
109 }
110
111
112 // Initialization of vtables and mirror object is done separately from base_create_array_klass,
113 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
114 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
115 k->initialize_supers(super_klass, nullptr, CHECK);
116 k->vtable().initialize_vtable();
117
118 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
119 // These classes will be put on a fixup list and their module fields will be patched once
120 // java.base is defined.
121 assert((module_entry != nullptr) || ((module_entry == nullptr) && !ModuleEntryTable::javabase_defined()),
122 "module entry not available post " JAVA_BASE_NAME " definition");
123 oop module_oop = (module_entry != nullptr) ? module_entry->module_oop() : (oop)nullptr;
124 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module_oop), Handle(), Handle(), CHECK);
125 }
126
127 ArrayKlass* ArrayKlass::array_klass(int n, TRAPS) {
128
129 assert(dimension() <= n, "check order of chain");
130 int dim = dimension();
131 if (dim == n) return this;
132
133 // lock-free read needs acquire semantics
134 if (higher_dimension_acquire() == nullptr) {
135
136 // Ensure atomic creation of higher dimensions
137 RecursiveLocker rl(MultiArray_lock, THREAD);
138
139 if (higher_dimension() == nullptr) {
140 // Create multi-dim klass object and link them together
141 ObjArrayKlass* ak =
142 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL);
143 // use 'release' to pair with lock-free load
144 release_set_higher_dimension(ak);
145 assert(ak->lower_dimension() == this, "lower dimension mismatch");
146 }
147 }
148
149 ObjArrayKlass* ak = higher_dimension();
150 assert(ak != nullptr, "should be set");
151 THREAD->check_possible_safepoint();
152 return ak->array_klass(n, THREAD);
153 }
154
155 ArrayKlass* ArrayKlass::array_klass_or_null(int n) {
156
157 assert(dimension() <= n, "check order of chain");
158 int dim = dimension();
159 if (dim == n) return this;
160
161 // lock-free read needs acquire semantics
162 if (higher_dimension_acquire() == nullptr) {
170 ArrayKlass* ArrayKlass::array_klass(TRAPS) {
171 return array_klass(dimension() + 1, THREAD);
172 }
173
174 ArrayKlass* ArrayKlass::array_klass_or_null() {
175 return array_klass_or_null(dimension() + 1);
176 }
177
178
179 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
180 Array<InstanceKlass*>* transitive_interfaces) {
181 // interfaces = { cloneable_klass, serializable_klass };
182 assert(num_extra_slots == 0, "sanity of primitive array type");
183 assert(transitive_interfaces == nullptr, "sanity");
184 // Must share this for correct bootstrapping!
185 set_secondary_supers(Universe::the_array_interfaces_array(),
186 Universe::the_array_interfaces_bitmap());
187 return nullptr;
188 }
189
190 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
191 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_ARRAY), CHECK_NULL);
192 size_t size = objArrayOopDesc::object_size(length);
193 ArrayKlass* ak = array_klass(n + dimension(), CHECK_NULL);
194 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
195 /* do_zero */ true, CHECK_NULL);
196 // initialization to null not necessary, area already cleared
197 return o;
198 }
199
200 // JVMTI support
201
202 jint ArrayKlass::jvmti_class_status() const {
203 return JVMTI_CLASS_STATUS_ARRAY;
204 }
205
206 void ArrayKlass::metaspace_pointers_do(MetaspaceClosure* it) {
207 Klass::metaspace_pointers_do(it);
208
209 ResourceMark rm;
210 log_trace(aot)("Iter(ArrayKlass): %p (%s)", this, external_name());
211
212 // need to cast away volatile
213 it->push((Klass**)&_higher_dimension);
214 it->push((Klass**)&_lower_dimension);
215 }
216
217 #if INCLUDE_CDS
219 Klass::remove_unshareable_info();
220 if (_higher_dimension != nullptr) {
221 ArrayKlass *ak = higher_dimension();
222 ak->remove_unshareable_info();
223 }
224 }
225
226 void ArrayKlass::remove_java_mirror() {
227 Klass::remove_java_mirror();
228 if (_higher_dimension != nullptr) {
229 ArrayKlass *ak = higher_dimension();
230 ak->remove_java_mirror();
231 }
232 }
233
234 void ArrayKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
235 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
236 // Klass recreates the component mirror also
237
238 if (_higher_dimension != nullptr) {
239 ArrayKlass *ak = higher_dimension();
240 log_array_class_load(ak);
241 ak->restore_unshareable_info(loader_data, protection_domain, CHECK);
242 }
243 }
244
245 void ArrayKlass::cds_print_value_on(outputStream* st) const {
246 assert(is_klass(), "must be klass");
247 st->print(" - array: %s", internal_name());
248 if (_higher_dimension != nullptr) {
249 ArrayKlass* ak = higher_dimension();
250 st->cr();
251 ak->cds_print_value_on(st);
252 }
253 }
254 #endif // INCLUDE_CDS
255
256 void ArrayKlass::log_array_class_load(Klass* k) {
257 LogTarget(Debug, class, load, array) lt;
258 if (lt.is_enabled()) {
259 LogStream ls(lt);
|
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 "cds/cdsConfig.hpp"
26 #include "cds/metaspaceShared.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "gc/shared/collectedHeap.inline.hpp"
33 #include "jvmtifiles/jvmti.h"
34 #include "memory/metaspaceClosure.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "memory/universe.hpp"
37 #include "oops/arrayKlass.inline.hpp"
38 #include "oops/arrayOop.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/refArrayKlass.hpp"
45 #include "runtime/handles.inline.hpp"
46
47 void* ArrayKlass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
48 return Metaspace::allocate(loader_data, word_size, MetaspaceObj::ClassType, true, THREAD);
49 }
50
51 ArrayKlass::ArrayKlass() {
52 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
53 }
54
55 int ArrayKlass::static_size(int header_size) {
56 // size of an array klass object
57 assert(header_size <= InstanceKlass::header_size(), "bad header size");
58 // If this assert fails, see comments in base_create_array_klass.
59 header_size = InstanceKlass::header_size();
60 int vtable_len = Universe::base_vtable_size();
61 int size = header_size + vtable_len;
62 return align_metadata_size(size);
63 }
64
78
79 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
80 Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
81 // There are no fields in an array klass but look to the super class (Object)
82 assert(super(), "super klass must be present");
83 return super()->find_field(name, sig, fd);
84 }
85
86 Method* ArrayKlass::uncached_lookup_method(const Symbol* name,
87 const Symbol* signature,
88 OverpassLookupMode overpass_mode,
89 PrivateLookupMode private_mode) const {
90 // There are no methods in an array klass but the super class (Object) has some
91 assert(super(), "super klass must be present");
92 // Always ignore overpass methods in superclasses, although technically the
93 // super klass of an array, (j.l.Object) should not have
94 // any overpass methods present.
95 return super()->uncached_lookup_method(name, signature, OverpassLookupMode::skip, private_mode);
96 }
97
98 ArrayKlass::ArrayKlass(Symbol* name, KlassKind kind, ArrayProperties props, markWord prototype_header) :
99 Klass(kind, prototype_header),
100 _dimension(1),
101 _properties(props),
102 _higher_dimension(nullptr),
103 _lower_dimension(nullptr) {
104 // Arrays don't add any new methods, so their vtable is the same size as
105 // the vtable of klass Object.
106 set_vtable_length(Universe::base_vtable_size());
107 set_name(name);
108 set_super(Universe::is_bootstrapping() ? nullptr : vmClasses::Object_klass());
109 set_layout_helper(Klass::_lh_neutral_value);
110 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
111 JFR_ONLY(INIT_ID(this);)
112 log_array_class_load(this);
113 }
114
115 Symbol* ArrayKlass::create_element_klass_array_name(Klass* element_klass, TRAPS) {
116 ResourceMark rm(THREAD);
117 Symbol* name = nullptr;
118 char *name_str = element_klass->name()->as_C_string();
119 int len = element_klass->name()->utf8_length();
120 char *new_str = NEW_RESOURCE_ARRAY(char, len + 4);
121 int idx = 0;
122 new_str[idx++] = JVM_SIGNATURE_ARRAY;
123 if (element_klass->is_instance_klass()) { // it could be an array or simple type
124 new_str[idx++] = JVM_SIGNATURE_CLASS;
125 }
126 memcpy(&new_str[idx], name_str, len * sizeof(char));
127 idx += len;
128 if (element_klass->is_instance_klass()) {
129 new_str[idx++] = JVM_SIGNATURE_ENDCLASS;
130 }
131 new_str[idx++] = '\0';
132 return SymbolTable::new_symbol(new_str);
133 }
134
135 // Initialization of vtables and mirror object is done separately from base_create_array_klass,
136 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
137 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
138 k->initialize_supers(super_klass, nullptr, CHECK);
139 k->vtable().initialize_vtable();
140
141 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
142 // These classes will be put on a fixup list and their module fields will be patched once
143 // java.base is defined.
144 assert((module_entry != nullptr) || ((module_entry == nullptr) && !ModuleEntryTable::javabase_defined()),
145 "module entry not available post " JAVA_BASE_NAME " definition");
146 oop module_oop = (module_entry != nullptr) ? module_entry->module_oop() : (oop)nullptr;
147
148 if (k->is_refArray_klass() || k->is_flatArray_klass()) {
149 assert(super_klass != nullptr, "Must be");
150 assert(k->super() != nullptr, "Must be");
151 assert(k->super() == super_klass, "Must be");
152 Handle mirror(THREAD, super_klass->java_mirror());
153 k->set_java_mirror(mirror);
154 } else {
155 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module_oop), Handle(), Handle(), CHECK);
156 }
157 }
158
159 ArrayKlass* ArrayKlass::array_klass(int n, TRAPS) {
160
161 assert(dimension() <= n, "check order of chain");
162 int dim = dimension();
163 if (dim == n) return this;
164
165 // lock-free read needs acquire semantics
166 if (higher_dimension_acquire() == nullptr) {
167
168 // Ensure atomic creation of higher dimensions
169 RecursiveLocker rl(MultiArray_lock, THREAD);
170
171 if (higher_dimension() == nullptr) {
172 // Create multi-dim klass object and link them together
173 ObjArrayKlass* ak = RefArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL);
174 // use 'release' to pair with lock-free load
175 release_set_higher_dimension(ak);
176 assert(ak->lower_dimension() == this, "lower dimension mismatch");
177 }
178 }
179
180 ObjArrayKlass* ak = higher_dimension();
181 assert(ak != nullptr, "should be set");
182 THREAD->check_possible_safepoint();
183 return ak->array_klass(n, THREAD);
184 }
185
186 ArrayKlass* ArrayKlass::array_klass_or_null(int n) {
187
188 assert(dimension() <= n, "check order of chain");
189 int dim = dimension();
190 if (dim == n) return this;
191
192 // lock-free read needs acquire semantics
193 if (higher_dimension_acquire() == nullptr) {
201 ArrayKlass* ArrayKlass::array_klass(TRAPS) {
202 return array_klass(dimension() + 1, THREAD);
203 }
204
205 ArrayKlass* ArrayKlass::array_klass_or_null() {
206 return array_klass_or_null(dimension() + 1);
207 }
208
209
210 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
211 Array<InstanceKlass*>* transitive_interfaces) {
212 // interfaces = { cloneable_klass, serializable_klass };
213 assert(num_extra_slots == 0, "sanity of primitive array type");
214 assert(transitive_interfaces == nullptr, "sanity");
215 // Must share this for correct bootstrapping!
216 set_secondary_supers(Universe::the_array_interfaces_array(),
217 Universe::the_array_interfaces_bitmap());
218 return nullptr;
219 }
220
221 oop ArrayKlass::component_mirror() const {
222 return java_lang_Class::component_mirror(java_mirror());
223 }
224
225 // JVMTI support
226
227 jint ArrayKlass::jvmti_class_status() const {
228 return JVMTI_CLASS_STATUS_ARRAY;
229 }
230
231 void ArrayKlass::metaspace_pointers_do(MetaspaceClosure* it) {
232 Klass::metaspace_pointers_do(it);
233
234 ResourceMark rm;
235 log_trace(aot)("Iter(ArrayKlass): %p (%s)", this, external_name());
236
237 // need to cast away volatile
238 it->push((Klass**)&_higher_dimension);
239 it->push((Klass**)&_lower_dimension);
240 }
241
242 #if INCLUDE_CDS
244 Klass::remove_unshareable_info();
245 if (_higher_dimension != nullptr) {
246 ArrayKlass *ak = higher_dimension();
247 ak->remove_unshareable_info();
248 }
249 }
250
251 void ArrayKlass::remove_java_mirror() {
252 Klass::remove_java_mirror();
253 if (_higher_dimension != nullptr) {
254 ArrayKlass *ak = higher_dimension();
255 ak->remove_java_mirror();
256 }
257 }
258
259 void ArrayKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
260 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
261 // Klass recreates the component mirror also
262
263 if (_higher_dimension != nullptr) {
264 ObjArrayKlass *ak = higher_dimension();
265 log_array_class_load(ak);
266 ak->restore_unshareable_info(loader_data, protection_domain, CHECK);
267 }
268 }
269
270 void ArrayKlass::cds_print_value_on(outputStream* st) const {
271 assert(is_klass(), "must be klass");
272 st->print(" - array: %s", internal_name());
273 if (_higher_dimension != nullptr) {
274 ArrayKlass* ak = higher_dimension();
275 st->cr();
276 ak->cds_print_value_on(st);
277 }
278 }
279 #endif // INCLUDE_CDS
280
281 void ArrayKlass::log_array_class_load(Klass* k) {
282 LogTarget(Debug, class, load, array) lt;
283 if (lt.is_enabled()) {
284 LogStream ls(lt);
|