1 /* 2 * Copyright (c) 1997, 2016, 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 Klass* _element_klass; // The klass of the elements of this array type 39 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass) 40 41 // Constructor 42 ObjArrayKlass(int n, KlassHandle element_klass, Symbol* name); 43 static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, KlassHandle klass_handle, Symbol* name, TRAPS); 44 public: 45 // For dummy objects 46 ObjArrayKlass() {} 47 48 // Instance variables 49 Klass* element_klass() const { return _element_klass; } 50 void set_element_klass(Klass* k) { _element_klass = k; } 51 Klass** element_klass_addr() { return &_element_klass; } 52 53 Klass* bottom_klass() const { return _bottom_klass; } 54 void set_bottom_klass(Klass* k) { _bottom_klass = k; } 55 Klass** bottom_klass_addr() { return &_bottom_klass; } 56 57 // Compiler/Interpreter offset 58 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); } 59 60 // Dispatched operation 61 bool can_be_primary_super_slow() const; 62 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 63 bool compute_is_subtype_of(Klass* k); 64 DEBUG_ONLY(bool is_objArray_klass_slow() const { return true; }) 65 int oop_size(oop obj) const; 66 67 // Allocation 68 static Klass* allocate_objArray_klass(ClassLoaderData* loader_data, 69 int n, KlassHandle element_klass, TRAPS); 70 71 objArrayOop allocate(int length, TRAPS); 72 oop multi_allocate(int rank, jint* sizes, TRAPS); 73 74 // Copying 75 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 76 77 // Compute protection domain 78 oop protection_domain() const { return bottom_klass()->protection_domain(); } 79 80 private: 81 // Either oop or narrowOop depending on UseCompressedOops. 82 // must be called from within ObjArrayKlass.cpp 83 template <class T> void do_copy(arrayOop s, T* src, arrayOop d, 84 T* dst, int length, TRAPS); 85 protected: 86 // Returns the ObjArrayKlass for n'th dimension. 87 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 88 89 // Returns the array class with this class as element type. 90 virtual Klass* array_klass_impl(bool or_null, TRAPS); 91 92 public: 93 94 static ObjArrayKlass* cast(Klass* k) { 95 return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k))); 96 } 97 98 static const ObjArrayKlass* cast(const Klass* k) { 99 assert(k->is_objArray_klass(), "cast to ObjArrayKlass"); 100 return static_cast<const ObjArrayKlass*>(k); 101 } 102 103 // Sizing 104 static int header_size() { return sizeof(ObjArrayKlass)/wordSize; } 105 int size() const { return ArrayKlass::static_size(header_size()); } 106 107 // Initialization (virtual from Klass) 108 void initialize(TRAPS); 109 110 // GC specific object visitors 111 // 112 // Mark Sweep 113 int oop_ms_adjust_pointers(oop obj); 114 #if INCLUDE_ALL_GCS 115 // Parallel Scavenge 116 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 117 // Parallel Compact 118 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 119 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 120 #endif 121 122 // Oop fields (and metadata) iterators 123 // [nv = true] Use non-virtual calls to do_oop_nv. 124 // [nv = false] Use virtual calls to do_oop. 125 // 126 // The ObjArrayKlass iterators also visits the Object's klass. 127 128 private: 129 130 // Iterate over oop elements and metadata. 131 template <bool nv, typename OopClosureType> 132 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 133 134 // Iterate over oop elements within mr, and metadata. 135 template <bool nv, typename OopClosureType> 136 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 137 138 // Iterate over oop elements with indices within [start, end), and metadata. 139 template <bool nv, class OopClosureType> 140 inline void oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end); 141 142 // Iterate over oop elements within [start, end), and metadata. 143 // Specialized for [T = oop] or [T = narrowOop]. 144 template <bool nv, typename T, class OopClosureType> 145 inline void oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end); 146 147 public: 148 // Iterate over all oop elements. 149 template <bool nv, class OopClosureType> 150 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure); 151 152 private: 153 // Iterate over all oop elements. 154 // Specialized for [T = oop] or [T = narrowOop]. 155 template <bool nv, typename T, class OopClosureType> 156 inline void oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure); 157 158 // Iterate over all oop elements with indices within mr. 159 template <bool nv, class OopClosureType> 160 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr); 161 162 // Iterate over oop elements within [low, high).. 163 // Specialized for [T = oop] or [T = narrowOop]. 164 template <bool nv, typename T, class OopClosureType> 165 inline void oop_oop_iterate_elements_specialized_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high); 166 167 168 public: 169 170 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 171 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 172 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_RANGE) 173 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_RANGE) 174 175 #if INCLUDE_ALL_GCS 176 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_NO_BACKWARDS) 177 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_NO_BACKWARDS) 178 #endif // INCLUDE_ALL_GCS 179 180 // JVM support 181 jint compute_modifier_flags(TRAPS) const; 182 183 public: 184 // Printing 185 void print_on(outputStream* st) const; 186 void print_value_on(outputStream* st) const; 187 188 void oop_print_value_on(oop obj, outputStream* st); 189 #ifndef PRODUCT 190 void oop_print_on (oop obj, outputStream* st); 191 #endif //PRODUCT 192 193 const char* internal_name() const; 194 195 // Verification 196 void verify_on(outputStream* st); 197 198 void oop_verify_on(oop obj, outputStream* st); 199 }; 200 201 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP