1 /* 2 * Copyright (c) 1997, 2018, 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_OBJARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_OBJARRAYKLASS_HPP 27 28 #include "classfile/classLoaderData.hpp" 29 #include "oops/arrayKlass.hpp" 30 #include "utilities/macros.hpp" 31 32 // ObjArrayKlass is the klass for objArrays 33 34 class ObjArrayKlass : public ArrayKlass { 35 friend class VMStructs; 36 friend class JVMCIVMStructs; 37 38 public: 39 static const KlassID ID = ObjArrayKlassID; 40 41 private: 42 // If you add a new field that points to any metaspace object, you 43 // must add this field to ObjArrayKlass::metaspace_pointers_do(). 44 Klass* _element_klass; // The klass of the elements of this array type 45 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass) 46 47 // Constructor 48 ObjArrayKlass(int n, Klass* element_klass, Symbol* name); 49 static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, Klass* k, Symbol* name, TRAPS); 50 public: 51 // For dummy objects 52 ObjArrayKlass() {} 53 54 // Instance variables 55 Klass* element_klass() const { return _element_klass; } 56 void set_element_klass(Klass* k) { _element_klass = k; } 57 Klass** element_klass_addr() { return &_element_klass; } 58 59 Klass* bottom_klass() const { return _bottom_klass; } 60 void set_bottom_klass(Klass* k) { _bottom_klass = k; } 61 Klass** bottom_klass_addr() { return &_bottom_klass; } 62 63 ModuleEntry* module() const; 64 PackageEntry* package() const; 65 66 // Compiler/Interpreter offset 67 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); } 68 69 // Dispatched operation 70 bool can_be_primary_super_slow() const; 71 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 72 Array<InstanceKlass*>* transitive_interfaces); 73 bool compute_is_subtype_of(Klass* k); 74 DEBUG_ONLY(bool is_objArray_klass_slow() const { return true; }) 75 int oop_size(oop obj) const; 76 77 // Allocation 78 static Klass* allocate_objArray_klass(ClassLoaderData* loader_data, 79 int n, Klass* element_klass, TRAPS); 80 81 objArrayOop allocate(int length, TRAPS); 82 oop multi_allocate(int rank, jint* sizes, TRAPS); 83 84 // Copying 85 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 86 87 // Compute protection domain 88 oop protection_domain() const { return bottom_klass()->protection_domain(); } 89 90 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 91 92 private: 93 // Either oop or narrowOop depending on UseCompressedOops. 94 // must be called from within ObjArrayKlass.cpp 95 void do_copy(arrayOop s, size_t src_offset, 96 arrayOop d, size_t dst_offset, 97 int length, TRAPS); 98 protected: 99 // Returns the ObjArrayKlass for n'th dimension. 100 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 101 102 // Returns the array class with this class as element type. 103 virtual Klass* array_klass_impl(bool or_null, TRAPS); 104 105 public: 106 107 static ObjArrayKlass* cast(Klass* k) { 108 return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k))); 109 } 110 111 static const ObjArrayKlass* cast(const Klass* k) { 112 assert(k->is_objArray_klass(), "cast to ObjArrayKlass"); 113 return static_cast<const ObjArrayKlass*>(k); 114 } 115 116 // Sizing 117 static int header_size() { return sizeof(ObjArrayKlass)/wordSize; } 118 int size() const { return ArrayKlass::static_size(header_size()); } 119 120 // Initialization (virtual from Klass) 121 void initialize(TRAPS); 122 123 // GC specific object visitors 124 // 125 #if INCLUDE_PARALLELGC 126 // Parallel Compact 127 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 128 #endif 129 130 // Oop fields (and metadata) iterators 131 // 132 // The ObjArrayKlass iterators also visits the Object's klass. 133 134 // Iterate over oop elements and metadata. 135 template <typename T, typename OopClosureType> 136 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 137 138 // Iterate over oop elements and metadata. 139 template <typename T, typename OopClosureType> 140 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 141 142 // Iterate over oop elements within mr, and metadata. 143 template <typename T, typename OopClosureType> 144 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 145 146 // Iterate over oop elements within [start, end), and metadata. 147 template <typename T, class OopClosureType> 148 inline void oop_oop_iterate_range(objArrayOop a, OopClosureType* closure, int start, int end); 149 150 public: 151 // Iterate over all oop elements. 152 template <typename T, class OopClosureType> 153 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure); 154 155 private: 156 // Iterate over all oop elements with indices within mr. 157 template <typename T, class OopClosureType> 158 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high); 159 160 template <typename T, class OopClosureType> 161 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr); 162 163 public: 164 // JVM support 165 jint compute_modifier_flags(TRAPS) const; 166 167 public: 168 // Printing 169 void print_on(outputStream* st) const; 170 void print_value_on(outputStream* st) const; 171 172 void oop_print_value_on(oop obj, outputStream* st); 173 #ifndef PRODUCT 174 void oop_print_on (oop obj, outputStream* st); 175 #endif //PRODUCT 176 177 const char* internal_name() const; 178 179 // Verification 180 void verify_on(outputStream* st); 181 182 void oop_verify_on(oop obj, outputStream* st); 183 }; 184 185 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP