1 /* 2 * Copyright (c) 1997, 2014, 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 private: 37 Klass* _element_klass; // The klass of the elements of this array type 38 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass) 39 40 // Constructor 41 ObjArrayKlass(int n, KlassHandle element_klass, Symbol* name); 42 static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, KlassHandle klass_handle, Symbol* name, TRAPS); 43 public: 44 // For dummy objects 45 ObjArrayKlass() {} 46 47 // Instance variables 48 Klass* element_klass() const { return _element_klass; } 49 void set_element_klass(Klass* k) { _element_klass = k; } 50 Klass** element_klass_addr() { return &_element_klass; } 51 52 Klass* bottom_klass() const { return _bottom_klass; } 53 void set_bottom_klass(Klass* k) { _bottom_klass = k; } 54 Klass** bottom_klass_addr() { return &_bottom_klass; } 55 56 // Compiler/Interpreter offset 57 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); } 58 59 // Dispatched operation 60 bool can_be_primary_super_slow() const; 61 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 62 bool compute_is_subtype_of(Klass* k); 63 bool oop_is_objArray_slow() const { return true; } 64 int oop_size(oop obj) const; 65 66 // Allocation 67 static Klass* allocate_objArray_klass(ClassLoaderData* loader_data, 68 int n, KlassHandle element_klass, TRAPS); 69 70 objArrayOop allocate(int length, TRAPS); 71 oop multi_allocate(int rank, jint* sizes, TRAPS); 72 73 // Copying 74 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 75 76 // Compute protection domain 77 oop protection_domain() const { return bottom_klass()->protection_domain(); } 78 79 private: 80 // Either oop or narrowOop depending on UseCompressedOops. 81 // must be called from within ObjArrayKlass.cpp 82 template <class T> void do_copy(arrayOop s, T* src, arrayOop d, 83 T* dst, int length, TRAPS); 84 protected: 85 // Returns the ObjArrayKlass for n'th dimension. 86 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 87 88 // Returns the array class with this class as element type. 89 virtual Klass* array_klass_impl(bool or_null, TRAPS); 90 91 public: 92 // Casting from Klass* 93 static ObjArrayKlass* cast(Klass* k) { 94 assert(k->oop_is_objArray(), "cast to ObjArrayKlass"); 95 return (ObjArrayKlass*) k; 96 } 97 98 // Sizing 99 static int header_size() { return sizeof(ObjArrayKlass)/HeapWordSize; } 100 int size() const { return ArrayKlass::static_size(header_size()); } 101 102 // Initialization (virtual from Klass) 103 void initialize(TRAPS); 104 105 // GC specific object visitors 106 // 107 // Mark Sweep 108 void oop_ms_follow_contents(oop obj); 109 int oop_ms_adjust_pointers(oop obj); 110 #if INCLUDE_ALL_GCS 111 // Parallel Scavenge 112 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 113 // Parallel Compact 114 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 115 void oop_pc_update_pointers(oop obj); 116 #endif 117 118 // Oop fields (and metadata) iterators 119 // [nv = true] Use non-virtual calls to do_oop_nv. 120 // [nv = false] Use virtual calls to do_oop. 121 // 122 // The ObjArrayKlass iterators also visits the Object's klass. 123 124 private: 125 126 // Iterate over oop elements and metadata. 127 template <bool nv, typename OopClosureType> 128 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 129 130 // Iterate over oop elements within mr, and metadata. 131 template <bool nv, typename OopClosureType> 132 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 133 134 // Iterate over oop elements with indices within [start, end), and metadata. 135 template <bool nv, class OopClosureType> 136 inline int oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end); 137 138 // Iterate over oop elements within [start, end), and metadata. 139 // Specialized for [T = oop] or [T = narrowOop]. 140 template <bool nv, typename T, class OopClosureType> 141 inline void oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end); 142 143 public: 144 // Iterate over all oop elements. 145 template <bool nv, class OopClosureType> 146 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure); 147 148 private: 149 // Iterate over all oop elements. 150 // Specialized for [T = oop] or [T = narrowOop]. 151 template <bool nv, typename T, class OopClosureType> 152 inline void oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure); 153 154 // Iterate over all oop elements with indices within mr. 155 template <bool nv, class OopClosureType> 156 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr); 157 158 // Iterate over oop elements within [low, high).. 159 // Specialized for [T = oop] or [T = narrowOop]. 160 template <bool nv, typename T, class OopClosureType> 161 inline void oop_oop_iterate_elements_specialized_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high); 162 163 164 public: 165 166 #define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 167 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 168 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 169 MemRegion mr); \ 170 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk, \ 171 int start, int end); 172 173 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL) 174 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL) 175 176 #if INCLUDE_ALL_GCS 177 #define ObjArrayKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 178 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 179 180 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 181 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 182 #endif // INCLUDE_ALL_GCS 183 184 // JVM support 185 jint compute_modifier_flags(TRAPS) const; 186 187 public: 188 // Printing 189 void print_on(outputStream* st) const; 190 void print_value_on(outputStream* st) const; 191 192 void oop_print_value_on(oop obj, outputStream* st); 193 #ifndef PRODUCT 194 void oop_print_on (oop obj, outputStream* st); 195 #endif //PRODUCT 196 197 const char* internal_name() const; 198 199 // Verification 200 void verify_on(outputStream* st); 201 202 void oop_verify_on(oop obj, outputStream* st); 203 }; 204 205 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP