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 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 ObjArrayKlass()52 ObjArrayKlass() {} 53 54 // Instance variables element_klass() const55 Klass* element_klass() const { return _element_klass; } set_element_klass(Klass * k)56 void set_element_klass(Klass* k) { _element_klass = k; } element_klass_addr()57 Klass** element_klass_addr() { return &_element_klass; } 58 bottom_klass() const59 Klass* bottom_klass() const { return _bottom_klass; } set_bottom_klass(Klass * k)60 void set_bottom_klass(Klass* k) { _bottom_klass = k; } bottom_klass_addr()61 Klass** bottom_klass_addr() { return &_bottom_klass; } 62 63 ModuleEntry* module() const; 64 PackageEntry* package() const; 65 66 // Compiler/Interpreter offset element_klass_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<Klass*>* 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 protection_domain() const88 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 cast(Klass * k)107 static ObjArrayKlass* cast(Klass* k) { 108 return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k))); 109 } 110 cast(const Klass * k)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 header_size()117 static int header_size() { return sizeof(ObjArrayKlass)/wordSize; } size() const118 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 Scavenge 127 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 128 // Parallel Compact 129 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 130 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 131 #endif 132 133 // Oop fields (and metadata) iterators 134 // 135 // The ObjArrayKlass iterators also visits the Object's klass. 136 137 // Iterate over oop elements and metadata. 138 template <typename T, typename OopClosureType> 139 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 140 141 // Iterate over oop elements and metadata. 142 template <typename T, typename OopClosureType> 143 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 144 145 // Iterate over oop elements within mr, and metadata. 146 template <typename T, typename OopClosureType> 147 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 148 149 // Iterate over oop elements within [start, end), and metadata. 150 template <typename T, class OopClosureType> 151 inline void oop_oop_iterate_range(objArrayOop a, OopClosureType* closure, int start, int end); 152 153 public: 154 // Iterate over all oop elements. 155 template <typename T, class OopClosureType> 156 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure); 157 158 private: 159 // Iterate over all oop elements with indices within mr. 160 template <typename T, class OopClosureType> 161 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high); 162 163 template <typename T, class OopClosureType> 164 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr); 165 166 public: 167 // JVM support 168 jint compute_modifier_flags(TRAPS) const; 169 170 public: 171 // Printing 172 void print_on(outputStream* st) const; 173 void print_value_on(outputStream* st) const; 174 175 void oop_print_value_on(oop obj, outputStream* st); 176 #ifndef PRODUCT 177 void oop_print_on (oop obj, outputStream* st); 178 #endif //PRODUCT 179 180 const char* internal_name() const; 181 182 // Verification 183 void verify_on(outputStream* st); 184 185 void oop_verify_on(oop obj, outputStream* st); 186 }; 187 188 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP 189