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_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 private: 38 // If you add a new field that points to any metaspace object, you 39 // must add this field to ObjArrayKlass::metaspace_pointers_do(). 40 Klass* _element_klass; // The klass of the elements of this array type 41 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass) 42 43 // Constructor 44 ObjArrayKlass(int n, Klass* element_klass, Symbol* name); 45 static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, Klass* k, Symbol* name, TRAPS); 46 public: 47 // For dummy objects 48 ObjArrayKlass() {} 49 50 // Instance variables 51 Klass* element_klass() const { return _element_klass; } 52 void set_element_klass(Klass* k) { _element_klass = k; } 53 Klass** element_klass_addr() { return &_element_klass; } 54 55 Klass* bottom_klass() const { return _bottom_klass; } 56 void set_bottom_klass(Klass* k) { _bottom_klass = k; } 57 Klass** bottom_klass_addr() { return &_bottom_klass; } 58 59 ModuleEntry* module() const; 60 PackageEntry* package() const; 61 62 // Compiler/Interpreter offset 63 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); } 64 65 // Dispatched operation 66 bool can_be_primary_super_slow() const; 67 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 68 Array<Klass*>* transitive_interfaces); 69 bool compute_is_subtype_of(Klass* k); 70 DEBUG_ONLY(bool is_objArray_klass_slow() const { return true; }) 71 int oop_size(oop obj) const; 72 73 // Allocation 74 static Klass* allocate_objArray_klass(ClassLoaderData* loader_data, 75 int n, Klass* element_klass, TRAPS); 76 77 objArrayOop allocate(int length, TRAPS); 78 oop multi_allocate(int rank, jint* sizes, TRAPS); 79 80 // Copying 81 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 82 83 // Compute protection domain 84 oop protection_domain() const { return bottom_klass()->protection_domain(); } 85 86 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 87 88 private: 89 // Either oop or narrowOop depending on UseCompressedOops. 90 // must be called from within ObjArrayKlass.cpp 91 template <class T> void do_copy(arrayOop s, size_t src_offset, 92 arrayOop d, size_t dst_offset, 93 int length, TRAPS); 94 protected: 95 // Returns the ObjArrayKlass for n'th dimension. 96 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 97 98 // Returns the array class with this class as element type. 99 virtual Klass* array_klass_impl(bool or_null, TRAPS); 100 101 public: 102 103 static ObjArrayKlass* cast(Klass* k) { 104 return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k))); 105 } 106 107 static const ObjArrayKlass* cast(const Klass* k) { 108 assert(k->is_objArray_klass(), "cast to ObjArrayKlass"); 109 return static_cast<const ObjArrayKlass*>(k); 110 } 111 112 // Sizing 113 static int header_size() { return sizeof(ObjArrayKlass)/wordSize; } 114 int size() const { return ArrayKlass::static_size(header_size()); } 115 116 // Initialization (virtual from Klass) 117 void initialize(TRAPS); 118 119 // GC specific object visitors 120 // 121 #if INCLUDE_PARALLELGC 122 // Parallel Scavenge 123 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 124 // Parallel Compact 125 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 126 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 127 #endif 128 129 // Oop fields (and metadata) iterators 130 // [nv = true] Use non-virtual calls to do_oop_nv. 131 // [nv = false] Use virtual calls to do_oop. 132 // 133 // The ObjArrayKlass iterators also visits the Object's klass. 134 135 private: 136 137 // Iterate over oop elements and metadata. 138 template <bool nv, typename OopClosureType> 139 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 140 141 // Iterate over oop elements within mr, and metadata. 142 template <bool nv, typename OopClosureType> 143 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 144 145 // Iterate over oop elements with indices within [start, end), and metadata. 146 template <bool nv, class OopClosureType> 147 inline void oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end); 148 149 // Iterate over oop elements within [start, end), and metadata. 150 // Specialized for [T = oop] or [T = narrowOop]. 151 template <bool nv, typename T, class OopClosureType> 152 inline void oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end); 153 154 public: 155 // Iterate over all oop elements. 156 template <bool nv, class OopClosureType> 157 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure); 158 159 private: 160 // Iterate over all oop elements. 161 // Specialized for [T = oop] or [T = narrowOop]. 162 template <bool nv, typename T, class OopClosureType> 163 inline void oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure); 164 165 // Iterate over all oop elements with indices within mr. 166 template <bool nv, class OopClosureType> 167 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr); 168 169 // Iterate over oop elements within [low, high).. 170 // Specialized for [T = oop] or [T = narrowOop]. 171 template <bool nv, typename T, class OopClosureType> 172 inline void oop_oop_iterate_elements_specialized_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high); 173 174 175 public: 176 177 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 178 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 179 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_RANGE) 180 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_RANGE) 181 182 #if INCLUDE_OOP_OOP_ITERATE_BACKWARDS 183 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_NO_BACKWARDS) 184 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_NO_BACKWARDS) 185 #endif 186 187 // JVM support 188 jint compute_modifier_flags(TRAPS) const; 189 190 public: 191 // Printing 192 void print_on(outputStream* st) const; 193 void print_value_on(outputStream* st) const; 194 195 void oop_print_value_on(oop obj, outputStream* st); 196 #ifndef PRODUCT 197 void oop_print_on (oop obj, outputStream* st); 198 #endif //PRODUCT 199 200 const char* internal_name() const; 201 202 // Verification 203 void verify_on(outputStream* st); 204 205 void oop_verify_on(oop obj, outputStream* st); 206 }; 207 208 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP