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 "cds/cdsConfig.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/moduleEntry.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/objArrayOop.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "runtime/handles.inline.hpp"
44
45 ArrayKlass::ArrayKlass() {
46 assert(CDSConfig::is_dumping_static_archive() || UseSharedSpaces, "only for CDS");
47 }
48
49 int ArrayKlass::static_size(int header_size) {
50 // size of an array klass object
51 assert(header_size <= InstanceKlass::header_size(), "bad header size");
52 // If this assert fails, see comments in base_create_array_klass.
53 header_size = InstanceKlass::header_size();
54 int vtable_len = Universe::base_vtable_size();
55 int size = header_size + vtable_len;
56 return align_metadata_size(size);
57 }
58
59
60 InstanceKlass* ArrayKlass::java_super() const {
88 // any overpass methods present.
89 return super()->uncached_lookup_method(name, signature, OverpassLookupMode::skip, private_mode);
90 }
91
92 ArrayKlass::ArrayKlass(Symbol* name, KlassKind kind) :
93 Klass(kind),
94 _dimension(1),
95 _higher_dimension(nullptr),
96 _lower_dimension(nullptr) {
97 // Arrays don't add any new methods, so their vtable is the same size as
98 // the vtable of klass Object.
99 set_vtable_length(Universe::base_vtable_size());
100 set_name(name);
101 set_super(Universe::is_bootstrapping() ? nullptr : vmClasses::Object_klass());
102 set_layout_helper(Klass::_lh_neutral_value);
103 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
104 JFR_ONLY(INIT_ID(this);)
105 log_array_class_load(this);
106 }
107
108
109 // Initialization of vtables and mirror object is done separately from base_create_array_klass,
110 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
111 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
112 k->initialize_supers(super_klass, nullptr, CHECK);
113 k->vtable().initialize_vtable();
114
115 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
116 // These classes will be put on a fixup list and their module fields will be patched once
117 // java.base is defined.
118 assert((module_entry != nullptr) || ((module_entry == nullptr) && !ModuleEntryTable::javabase_defined()),
119 "module entry not available post " JAVA_BASE_NAME " definition");
120 oop module = (module_entry != nullptr) ? module_entry->module() : (oop)nullptr;
121 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(), Handle(), CHECK);
122 }
123
124 ArrayKlass* ArrayKlass::array_klass(int n, TRAPS) {
125
126 assert(dimension() <= n, "check order of chain");
127 int dim = dimension();
128 if (dim == n) return this;
129
130 // lock-free read needs acquire semantics
131 if (higher_dimension_acquire() == nullptr) {
132
133 ResourceMark rm(THREAD);
134 {
135 // Ensure atomic creation of higher dimensions
136 MutexLocker mu(THREAD, MultiArray_lock);
137
138 // Check if another thread beat us
139 if (higher_dimension() == nullptr) {
140
141 // Create multi-dim klass object and link them together
142 ObjArrayKlass* ak =
143 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL);
144 ak->set_lower_dimension(this);
145 // use 'release' to pair with lock-free load
146 release_set_higher_dimension(ak);
147 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass");
148 }
149 }
150 }
151
152 ObjArrayKlass *ak = higher_dimension();
153 THREAD->check_possible_safepoint();
154 return ak->array_klass(n, THREAD);
155 }
156
157 ArrayKlass* ArrayKlass::array_klass_or_null(int n) {
158
159 assert(dimension() <= n, "check order of chain");
160 int dim = dimension();
161 if (dim == n) return this;
162
163 // lock-free read needs acquire semantics
181 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
182 Array<InstanceKlass*>* transitive_interfaces) {
183 // interfaces = { cloneable_klass, serializable_klass };
184 assert(num_extra_slots == 0, "sanity of primitive array type");
185 assert(transitive_interfaces == nullptr, "sanity");
186 // Must share this for correct bootstrapping!
187 set_secondary_supers(Universe::the_array_interfaces_array());
188 return nullptr;
189 }
190
191 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
192 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_ARRAY), CHECK_NULL);
193 size_t size = objArrayOopDesc::object_size(length);
194 ArrayKlass* ak = array_klass(n + dimension(), CHECK_NULL);
195 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
196 /* do_zero */ true, CHECK_NULL);
197 // initialization to null not necessary, area already cleared
198 return o;
199 }
200
201 jint ArrayKlass::compute_modifier_flags() const {
202 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
203 }
204
205 // JVMTI support
206
207 jint ArrayKlass::jvmti_class_status() const {
208 return JVMTI_CLASS_STATUS_ARRAY;
209 }
210
211 void ArrayKlass::metaspace_pointers_do(MetaspaceClosure* it) {
212 Klass::metaspace_pointers_do(it);
213
214 ResourceMark rm;
215 log_trace(cds)("Iter(ArrayKlass): %p (%s)", this, external_name());
216
217 // need to cast away volatile
218 it->push((Klass**)&_higher_dimension);
219 it->push((Klass**)&_lower_dimension);
220 }
|
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 "cds/cdsConfig.hpp"
27 #include "cds/metaspaceShared.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "gc/shared/collectedHeap.inline.hpp"
34 #include "jvmtifiles/jvmti.h"
35 #include "memory/metaspaceClosure.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "memory/universe.hpp"
38 #include "oops/arrayKlass.inline.hpp"
39 #include "oops/arrayOop.hpp"
40 #include "oops/instanceKlass.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "runtime/handles.inline.hpp"
46
47 ArrayKlass::ArrayKlass() {
48 assert(CDSConfig::is_dumping_static_archive() || UseSharedSpaces, "only for CDS");
49 }
50
51 int ArrayKlass::static_size(int header_size) {
52 // size of an array klass object
53 assert(header_size <= InstanceKlass::header_size(), "bad header size");
54 // If this assert fails, see comments in base_create_array_klass.
55 header_size = InstanceKlass::header_size();
56 int vtable_len = Universe::base_vtable_size();
57 int size = header_size + vtable_len;
58 return align_metadata_size(size);
59 }
60
61
62 InstanceKlass* ArrayKlass::java_super() const {
90 // any overpass methods present.
91 return super()->uncached_lookup_method(name, signature, OverpassLookupMode::skip, private_mode);
92 }
93
94 ArrayKlass::ArrayKlass(Symbol* name, KlassKind kind) :
95 Klass(kind),
96 _dimension(1),
97 _higher_dimension(nullptr),
98 _lower_dimension(nullptr) {
99 // Arrays don't add any new methods, so their vtable is the same size as
100 // the vtable of klass Object.
101 set_vtable_length(Universe::base_vtable_size());
102 set_name(name);
103 set_super(Universe::is_bootstrapping() ? nullptr : vmClasses::Object_klass());
104 set_layout_helper(Klass::_lh_neutral_value);
105 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
106 JFR_ONLY(INIT_ID(this);)
107 log_array_class_load(this);
108 }
109
110 Symbol* ArrayKlass::create_element_klass_array_name(Klass* element_klass, TRAPS) {
111 ResourceMark rm(THREAD);
112 Symbol* name = nullptr;
113 char *name_str = element_klass->name()->as_C_string();
114 int len = element_klass->name()->utf8_length();
115 char *new_str = NEW_RESOURCE_ARRAY(char, len + 4);
116 int idx = 0;
117 new_str[idx++] = JVM_SIGNATURE_ARRAY;
118 if (element_klass->is_instance_klass()) { // it could be an array or simple type
119 new_str[idx++] = JVM_SIGNATURE_CLASS;
120 }
121 memcpy(&new_str[idx], name_str, len * sizeof(char));
122 idx += len;
123 if (element_klass->is_instance_klass()) {
124 new_str[idx++] = JVM_SIGNATURE_ENDCLASS;
125 }
126 new_str[idx++] = '\0';
127 return SymbolTable::new_symbol(new_str);
128 }
129
130 // Initialization of vtables and mirror object is done separately from base_create_array_klass,
131 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
132 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
133 k->initialize_supers(super_klass, nullptr, CHECK);
134 k->vtable().initialize_vtable();
135
136 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
137 // These classes will be put on a fixup list and their module fields will be patched once
138 // java.base is defined.
139 assert((module_entry != nullptr) || ((module_entry == nullptr) && !ModuleEntryTable::javabase_defined()),
140 "module entry not available post " JAVA_BASE_NAME " definition");
141 oop module = (module_entry != nullptr) ? module_entry->module() : (oop)nullptr;
142 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(), Handle(), CHECK);
143 }
144
145 ArrayKlass* ArrayKlass::array_klass(int n, TRAPS) {
146
147 assert(dimension() <= n, "check order of chain");
148 int dim = dimension();
149 if (dim == n) return this;
150
151 // lock-free read needs acquire semantics
152 if (higher_dimension_acquire() == nullptr) {
153
154 ResourceMark rm(THREAD);
155 {
156 // Ensure atomic creation of higher dimensions
157 MutexLocker mu(THREAD, MultiArray_lock);
158
159 // Check if another thread beat us
160 if (higher_dimension() == nullptr) {
161
162 // Create multi-dim klass object and link them together
163 ObjArrayKlass* ak =
164 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this,
165 false, CHECK_NULL);
166 ak->set_lower_dimension(this);
167 // use 'release' to pair with lock-free load
168 release_set_higher_dimension(ak);
169 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass");
170 }
171 }
172 }
173
174 ObjArrayKlass *ak = higher_dimension();
175 THREAD->check_possible_safepoint();
176 return ak->array_klass(n, THREAD);
177 }
178
179 ArrayKlass* ArrayKlass::array_klass_or_null(int n) {
180
181 assert(dimension() <= n, "check order of chain");
182 int dim = dimension();
183 if (dim == n) return this;
184
185 // lock-free read needs acquire semantics
203 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
204 Array<InstanceKlass*>* transitive_interfaces) {
205 // interfaces = { cloneable_klass, serializable_klass };
206 assert(num_extra_slots == 0, "sanity of primitive array type");
207 assert(transitive_interfaces == nullptr, "sanity");
208 // Must share this for correct bootstrapping!
209 set_secondary_supers(Universe::the_array_interfaces_array());
210 return nullptr;
211 }
212
213 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
214 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_ARRAY), CHECK_NULL);
215 size_t size = objArrayOopDesc::object_size(length);
216 ArrayKlass* ak = array_klass(n + dimension(), CHECK_NULL);
217 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
218 /* do_zero */ true, CHECK_NULL);
219 // initialization to null not necessary, area already cleared
220 return o;
221 }
222
223 oop ArrayKlass::component_mirror() const {
224 return java_lang_Class::component_mirror(java_mirror());
225 }
226
227 jint ArrayKlass::compute_modifier_flags() const {
228 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
229 }
230
231 // JVMTI support
232
233 jint ArrayKlass::jvmti_class_status() const {
234 return JVMTI_CLASS_STATUS_ARRAY;
235 }
236
237 void ArrayKlass::metaspace_pointers_do(MetaspaceClosure* it) {
238 Klass::metaspace_pointers_do(it);
239
240 ResourceMark rm;
241 log_trace(cds)("Iter(ArrayKlass): %p (%s)", this, external_name());
242
243 // need to cast away volatile
244 it->push((Klass**)&_higher_dimension);
245 it->push((Klass**)&_lower_dimension);
246 }
|