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_TYPEARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_TYPEARRAYKLASS_HPP 27 28 #include "classfile/classLoaderData.hpp" 29 #include "oops/arrayKlass.hpp" 30 31 // A TypeArrayKlass is the klass of a typeArray 32 // It contains the type and size of the elements 33 34 class TypeArrayKlass : public ArrayKlass { 35 friend class VMStructs; 36 37 public: 38 static const KlassID ID = TypeArrayKlassID; 39 40 private: 41 jint _max_length; // maximum number of elements allowed in an array 42 43 // Constructor 44 TypeArrayKlass(BasicType type, Symbol* name); 45 static TypeArrayKlass* allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS); 46 public: TypeArrayKlass()47 TypeArrayKlass() {} // For dummy objects. 48 49 // instance variables max_length()50 jint max_length() { return _max_length; } set_max_length(jint m)51 void set_max_length(jint m) { _max_length = m; } 52 53 // testers 54 DEBUG_ONLY(bool is_typeArray_klass_slow() const { return true; }) 55 56 // klass allocation 57 static TypeArrayKlass* create_klass(BasicType type, const char* name_str, 58 TRAPS); create_klass(BasicType type,int scale,TRAPS)59 static inline Klass* create_klass(BasicType type, int scale, TRAPS) { 60 TypeArrayKlass* tak = create_klass(type, external_name(type), CHECK_NULL); 61 assert(scale == (1 << tak->log2_element_size()), "scale must check out"); 62 return tak; 63 } 64 65 int oop_size(oop obj) const; 66 67 bool compute_is_subtype_of(Klass* k); 68 69 // Allocation 70 typeArrayOop allocate_common(int length, bool do_zero, TRAPS); allocate(int length,TRAPS)71 typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, true, THREAD); } 72 oop multi_allocate(int rank, jint* sizes, TRAPS); 73 protection_domain() const74 oop protection_domain() const { return NULL; } 75 76 // Copying 77 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 78 79 // GC specific object visitors 80 // 81 #if INCLUDE_PARALLELGC 82 // Parallel Scavenge 83 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 84 // Parallel Compact 85 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 86 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 87 #endif 88 89 // Oop iterators. Since there are no oops in TypeArrayKlasses, 90 // these functions only return the size of the object. 91 92 private: 93 // The implementation used by all oop_oop_iterate functions in TypeArrayKlasses. 94 inline void oop_oop_iterate_impl(oop obj, OopIterateClosure* closure); 95 96 public: 97 // Wraps oop_oop_iterate_impl to conform to macros. 98 template <typename T, typename OopClosureType> 99 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 100 101 // Wraps oop_oop_iterate_impl to conform to macros. 102 template <typename T, typename OopClosureType> 103 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 104 105 // Wraps oop_oop_iterate_impl to conform to macros. 106 template <typename T, typename OopClosureType> 107 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 108 109 protected: 110 // Find n'th dimensional array 111 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 112 113 // Returns the array class with this class as element type 114 virtual Klass* array_klass_impl(bool or_null, TRAPS); 115 116 public: cast(Klass * k)117 static TypeArrayKlass* cast(Klass* k) { 118 return const_cast<TypeArrayKlass*>(cast(const_cast<const Klass*>(k))); 119 } 120 cast(const Klass * k)121 static const TypeArrayKlass* cast(const Klass* k) { 122 assert(k->is_typeArray_klass(), "cast to TypeArrayKlass"); 123 return static_cast<const TypeArrayKlass*>(k); 124 } 125 126 // Naming 127 static const char* external_name(BasicType type); 128 129 // Sizing header_size()130 static int header_size() { return sizeof(TypeArrayKlass)/wordSize; } size() const131 int size() const { return ArrayKlass::static_size(header_size()); } 132 133 // Initialization (virtual from Klass) 134 void initialize(TRAPS); 135 136 public: 137 // Printing 138 #ifndef PRODUCT 139 void oop_print_on(oop obj, outputStream* st); 140 #endif 141 142 void print_on(outputStream* st) const; 143 void print_value_on(outputStream* st) const; 144 145 public: 146 const char* internal_name() const; 147 148 ModuleEntry* module() const; 149 PackageEntry* package() const; 150 }; 151 152 #endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP 153