1 /* 2 * Copyright (c) 1997, 2017, 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 #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP 27 28 #include "memory/universe.hpp" 29 #include "oops/klass.hpp" 30 31 class fieldDescriptor; 32 class klassVtable; 33 34 // ArrayKlass is the abstract baseclass for all array classes 35 36 class ArrayKlass: public Klass { 37 friend class VMStructs; 38 private: 39 // If you add a new field that points to any metaspace object, you 40 // must add this field to ArrayKlass::metaspace_pointers_do(). 41 int _dimension; // This is n'th-dimensional array. 42 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). 43 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). 44 45 protected: 46 // Constructors 47 // The constructor with the Symbol argument does the real array 48 // initialization, the other is a dummy 49 ArrayKlass(Symbol* name); 50 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); } 51 52 public: 53 // Testing operation 54 DEBUG_ONLY(bool is_array_klass_slow() const { return true; }) 55 56 // Instance variables 57 int dimension() const { return _dimension; } 58 void set_dimension(int dimension) { _dimension = dimension; } 59 60 Klass* higher_dimension() const { return _higher_dimension; } 61 inline Klass* higher_dimension_acquire() const; // load with acquire semantics 62 void set_higher_dimension(Klass* k) { _higher_dimension = k; } 63 inline void release_set_higher_dimension(Klass* k); // store with release semantics 64 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;} 65 66 Klass* lower_dimension() const { return _lower_dimension; } 67 void set_lower_dimension(Klass* k) { _lower_dimension = k; } 68 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;} 69 70 // offset of first element, including any padding for the sake of alignment 71 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } 72 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } 73 // type of elements (T_OBJECT for both oop arrays and array-arrays) 74 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } 75 76 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } 77 78 // Allocation 79 // Sizes points to the first dimension of the array, subsequent dimensions 80 // are always in higher memory. The callers of these set that up. 81 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); 82 objArrayOop allocate_arrayArray(int n, int length, TRAPS); 83 84 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 85 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 86 87 // Lookup operations 88 Method* uncached_lookup_method(const Symbol* name, 89 const Symbol* signature, 90 OverpassLookupMode overpass_mode) const; 91 92 static ArrayKlass* cast(Klass* k) { 93 return const_cast<ArrayKlass*>(cast(const_cast<const Klass*>(k))); 94 } 95 96 static const ArrayKlass* cast(const Klass* k) { 97 assert(k->is_array_klass(), "cast to ArrayKlass"); 98 return static_cast<const ArrayKlass*>(k); 99 } 100 101 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 102 Array<Klass*>* transitive_interfaces); 103 bool compute_is_subtype_of(Klass* k); 104 105 // Sizing 106 static int static_size(int header_size); 107 108 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 109 110 #if INCLUDE_SERVICES 111 virtual void collect_statistics(KlassSizeStats *sz) const { 112 Klass::collect_statistics(sz); 113 // Do nothing for now, but remember to modify if you add new 114 // stuff to ArrayKlass. 115 } 116 #endif 117 118 // Iterators 119 void array_klasses_do(void f(Klass* k)); 120 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 121 122 // Return a handle. 123 static void complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module, TRAPS); 124 125 126 // jvm support 127 jint compute_modifier_flags(TRAPS) const; 128 129 // JVMTI support 130 jint jvmti_class_status() const; 131 132 // CDS support - remove and restore oops from metadata. Oops are not shared. 133 virtual void remove_unshareable_info(); 134 virtual void remove_java_mirror(); 135 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 136 137 // Printing 138 void print_on(outputStream* st) const; 139 void print_value_on(outputStream* st) const; 140 141 void oop_print_on(oop obj, outputStream* st); 142 143 // Verification 144 void verify_on(outputStream* st); 145 146 void oop_verify_on(oop obj, outputStream* st); 147 }; 148 149 // Array oop iteration macros for declarations. 150 // Used to generate the declarations in the *ArrayKlass header files. 151 152 #define OOP_OOP_ITERATE_DECL_RANGE(OopClosureType, nv_suffix) \ 153 void oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end); 154 155 #if INCLUDE_OOP_OOP_ITERATE_BACKWARDS 156 // Named NO_BACKWARDS because the definition used by *ArrayKlass isn't reversed, see below. 157 #define OOP_OOP_ITERATE_DECL_NO_BACKWARDS(OopClosureType, nv_suffix) \ 158 void oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure); 159 #endif 160 161 162 // Array oop iteration macros for definitions. 163 // Used to generate the definitions in the *ArrayKlass.inline.hpp files. 164 165 #define OOP_OOP_ITERATE_DEFN_RANGE(KlassType, OopClosureType, nv_suffix) \ 166 \ 167 void KlassType::oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end) { \ 168 oop_oop_iterate_range<nvs_to_bool(nv_suffix)>(obj, closure, start, end); \ 169 } 170 171 #if INCLUDE_OOP_OOP_ITERATE_BACKWARDS 172 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) \ 173 void KlassType::oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \ 174 /* No reverse implementation ATM. */ \ 175 oop_oop_iterate<nvs_to_bool(nv_suffix)>(obj, closure); \ 176 } 177 #else 178 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) 179 #endif 180 181 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP