32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.hpp"
34 #include "oops/arrayKlass.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/objArrayOop.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "runtime/handles.inline.hpp"
40
41 int ArrayKlass::static_size(int header_size) {
42 // size of an array klass object
43 assert(header_size <= InstanceKlass::header_size(), "bad header size");
44 // If this assert fails, see comments in base_create_array_klass.
45 header_size = InstanceKlass::header_size();
46 int vtable_len = Universe::base_vtable_size();
47 int size = header_size + vtable_len;
48 return align_metadata_size(size);
49 }
50
51
52 Klass* ArrayKlass::java_super() const {
53 if (super() == NULL) return NULL; // bootstrap case
54 // Array klasses have primary supertypes which are not reported to Java.
55 // Example super chain: String[][] -> Object[][] -> Object[] -> Object
56 return SystemDictionary::Object_klass();
57 }
58
59
60 oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
61 ShouldNotReachHere();
62 return NULL;
63 }
64
65 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
66 Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
67 // There are no fields in an array klass but look to the super class (Object)
68 assert(super(), "super klass must be present");
69 return super()->find_field(name, sig, fd);
70 }
71
72 Method* ArrayKlass::uncached_lookup_method(const Symbol* name,
73 const Symbol* signature,
74 OverpassLookupMode overpass_mode,
75 PrivateLookupMode private_mode) const {
76 // There are no methods in an array klass but the super class (Object) has some
77 assert(super(), "super klass must be present");
78 // Always ignore overpass methods in superclasses, although technically the
79 // super klass of an array, (j.l.Object) should not have
80 // any overpass methods present.
81 return super()->uncached_lookup_method(name, signature, Klass::skip_overpass, private_mode);
82 }
83
84 ArrayKlass::ArrayKlass(Symbol* name, KlassID id) :
85 Klass(id),
86 _dimension(1),
87 _higher_dimension(NULL),
88 _lower_dimension(NULL) {
89 // Arrays don't add any new methods, so their vtable is the same size as
90 // the vtable of klass Object.
91 set_vtable_length(Universe::base_vtable_size());
92 set_name(name);
93 set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass());
94 set_layout_helper(Klass::_lh_neutral_value);
95 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
96 JFR_ONLY(INIT_ID(this);)
97 }
98
99
100 // Initialization of vtables and mirror object is done separatly from base_create_array_klass,
101 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
102 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
103 k->initialize_supers(super_klass, NULL, CHECK);
104 k->vtable().initialize_vtable(false, CHECK);
105
106 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
107 // These classes will be put on a fixup list and their module fields will be patched once
108 // java.base is defined.
109 assert((module_entry != NULL) || ((module_entry == NULL) && !ModuleEntryTable::javabase_defined()),
110 "module entry not available post " JAVA_BASE_NAME " definition");
111 oop module = (module_entry != NULL) ? module_entry->module() : (oop)NULL;
112 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(), CHECK);
113 }
114
115 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
116 Array<Klass*>* transitive_interfaces) {
117 // interfaces = { cloneable_klass, serializable_klass };
118 assert(num_extra_slots == 0, "sanity of primitive array type");
119 assert(transitive_interfaces == NULL, "sanity");
120 // Must share this for correct bootstrapping!
121 set_secondary_supers(Universe::the_array_interfaces_array());
122 return NULL;
123 }
124
125 bool ArrayKlass::compute_is_subtype_of(Klass* k) {
126 // An array is a subtype of Serializable, Clonable, and Object
127 return k == SystemDictionary::Object_klass()
128 || k == SystemDictionary::Cloneable_klass()
129 || k == SystemDictionary::Serializable_klass();
130 }
131
132 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
133 if (length < 0) {
134 THROW_MSG_0(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
135 }
136 if (length > arrayOopDesc::max_array_length(T_ARRAY)) {
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32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.hpp"
34 #include "oops/arrayKlass.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/objArrayOop.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "runtime/handles.inline.hpp"
40
41 int ArrayKlass::static_size(int header_size) {
42 // size of an array klass object
43 assert(header_size <= InstanceKlass::header_size(), "bad header size");
44 // If this assert fails, see comments in base_create_array_klass.
45 header_size = InstanceKlass::header_size();
46 int vtable_len = Universe::base_vtable_size();
47 int size = header_size + vtable_len;
48 return align_metadata_size(size);
49 }
50
51
52 InstanceKlass* ArrayKlass::java_super() const {
53 if (super() == NULL) return NULL; // bootstrap case
54 // Array klasses have primary supertypes which are not reported to Java.
55 // Example super chain: String[][] -> Object[][] -> Object[] -> Object
56 return SystemDictionary::Object_klass();
57 }
58
59
60 oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
61 ShouldNotReachHere();
62 return NULL;
63 }
64
65 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
66 Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
67 // There are no fields in an array klass but look to the super class (Object)
68 assert(super(), "super klass must be present");
69 return super()->find_field(name, sig, fd);
70 }
71
72 Method* ArrayKlass::uncached_lookup_method(const Symbol* name,
73 const Symbol* signature,
74 OverpassLookupMode overpass_mode,
75 PrivateLookupMode private_mode) const {
76 // There are no methods in an array klass but the super class (Object) has some
77 assert(super(), "super klass must be present");
78 // Always ignore overpass methods in superclasses, although technically the
79 // super klass of an array, (j.l.Object) should not have
80 // any overpass methods present.
81 return super()->uncached_lookup_method(name, signature, Klass::skip_overpass, private_mode);
82 }
83
84 ArrayKlass::ArrayKlass(Symbol* name, KlassID id) :
85 Klass(id),
86 _dimension(1),
87 _higher_dimension(NULL),
88 _lower_dimension(NULL) {
89 // Arrays don't add any new methods, so their vtable is the same size as
90 // the vtable of klass Object.
91 set_vtable_length(Universe::base_vtable_size());
92 set_name(name);
93 set_super(Universe::is_bootstrapping() ? (InstanceKlass*)NULL : SystemDictionary::Object_klass());
94 set_layout_helper(Klass::_lh_neutral_value);
95 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
96 JFR_ONLY(INIT_ID(this);)
97 }
98
99
100 // Initialization of vtables and mirror object is done separatly from base_create_array_klass,
101 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
102 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module_entry, TRAPS) {
103 k->initialize_supers(super_klass, NULL, CHECK);
104 k->vtable().initialize_vtable(false, CHECK);
105
106 // During bootstrapping, before java.base is defined, the module_entry may not be present yet.
107 // These classes will be put on a fixup list and their module fields will be patched once
108 // java.base is defined.
109 assert((module_entry != NULL) || ((module_entry == NULL) && !ModuleEntryTable::javabase_defined()),
110 "module entry not available post " JAVA_BASE_NAME " definition");
111 oop module = (module_entry != NULL) ? module_entry->module() : (oop)NULL;
112 java_lang_Class::create_mirror(k, Handle(THREAD, k->class_loader()), Handle(THREAD, module), Handle(), CHECK);
113 }
114
115 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots,
116 Array<InstanceKlass*>* transitive_interfaces) {
117 // interfaces = { cloneable_klass, serializable_klass };
118 assert(num_extra_slots == 0, "sanity of primitive array type");
119 assert(transitive_interfaces == NULL, "sanity");
120 // Must share this for correct bootstrapping!
121 set_secondary_supers(Universe::the_array_interfaces_array());
122 return NULL;
123 }
124
125 bool ArrayKlass::compute_is_subtype_of(Klass* k) {
126 // An array is a subtype of Serializable, Clonable, and Object
127 return k == SystemDictionary::Object_klass()
128 || k == SystemDictionary::Cloneable_klass()
129 || k == SystemDictionary::Serializable_klass();
130 }
131
132 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
133 if (length < 0) {
134 THROW_MSG_0(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
135 }
136 if (length > arrayOopDesc::max_array_length(T_ARRAY)) {
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