1 /* 2 * Copyright (c) 2017, 2025, 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_FLATARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_FLATARRAYKLASS_HPP 27 28 #include "classfile/classLoaderData.hpp" 29 #include "oops/arrayKlass.hpp" 30 #include "oops/inlineKlass.hpp" 31 #include "oops/objArrayKlass.hpp" 32 #include "utilities/macros.hpp" 33 34 /** 35 * Array of inline types, gives a layout of typeArrayOop, but needs oops iterators 36 */ 37 class FlatArrayKlass : public ObjArrayKlass { 38 friend class Deoptimization; 39 friend class oopFactory; 40 friend class VMStructs; 41 42 public: 43 static const KlassKind Kind = FlatArrayKlassKind; 44 45 private: 46 // Constructor 47 FlatArrayKlass(Klass* element_klass, Symbol* name, ArrayProperties props, LayoutKind lk); 48 49 LayoutKind _layout_kind; 50 51 public: 52 53 FlatArrayKlass() {} // used by CppVtableCloner<T>::initialize() 54 55 InlineKlass* element_klass() const { return InlineKlass::cast(_element_klass); } 56 void set_element_klass(Klass* k) { assert(k->is_inline_klass(), "Must be"); _element_klass = k; } 57 58 LayoutKind layout_kind() const { return _layout_kind; } 59 void set_layout_kind(LayoutKind lk) { _layout_kind = lk; } 60 static ByteSize layout_kind_offset() { return in_ByteSize(offset_of(FlatArrayKlass, _layout_kind)); } 61 62 // Casting from Klass* 63 static FlatArrayKlass* cast(Klass* k) { 64 assert(k->is_flatArray_klass(), "cast to FlatArrayKlass"); 65 return (FlatArrayKlass*) k; 66 } 67 68 // klass allocation 69 static FlatArrayKlass* allocate_klass(Klass* element_klass, ArrayProperties props, LayoutKind lk, TRAPS); 70 71 void initialize(TRAPS); 72 73 ModuleEntry* module() const; 74 PackageEntry* package() const; 75 76 bool can_be_primary_super_slow() const; 77 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 78 Array<InstanceKlass*>* transitive_interfaces); 79 80 int element_byte_size() const { return 1 << layout_helper_log2_element_size(_layout_helper); } 81 82 bool is_flatArray_klass_slow() const { return true; } 83 84 bool contains_oops() { 85 return element_klass()->contains_oops(); 86 } 87 88 oop protection_domain() const; 89 90 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 91 92 static jint array_layout_helper(InlineKlass* vklass, LayoutKind lk); // layout helper for values 93 94 // sizing 95 static int header_size() { return sizeof(FlatArrayKlass)/HeapWordSize; } 96 int size() const { return ArrayKlass::static_size(header_size()); } 97 98 jint max_elements() const; 99 100 size_t oop_size(oop obj) const; 101 102 // Oop Allocation 103 private: 104 objArrayOop allocate_instance(int length, ArrayProperties props, TRAPS); 105 public: 106 oop multi_allocate(int rank, jint* sizes, TRAPS); 107 108 // Naming 109 const char* internal_name() const { return external_name(); } 110 111 // Copying 112 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 113 114 // GC specific object visitors 115 template <typename T, typename OopClosureType> 116 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 117 118 template <typename T, typename OopClosureType> 119 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 120 121 template <typename T, typename OopClosureType> 122 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 123 124 template <typename T, class OopClosureType> 125 inline void oop_oop_iterate_elements(flatArrayOop a, OopClosureType* closure); 126 127 private: 128 template <typename T, class OopClosureType> 129 inline void oop_oop_iterate_elements_specialized(flatArrayOop a, OopClosureType* closure); 130 131 template <typename T, class OopClosureType> 132 inline void oop_oop_iterate_elements_bounded(flatArrayOop a, OopClosureType* closure, MemRegion mr); 133 134 template <typename T, class OopClosureType> 135 inline void oop_oop_iterate_elements_specialized_bounded(flatArrayOop a, OopClosureType* closure, void* low, void* high); 136 137 public: 138 u2 compute_modifier_flags() const; 139 140 // Printing 141 void print_on(outputStream* st) const; 142 void print_value_on(outputStream* st) const; 143 144 void oop_print_value_on(oop obj, outputStream* st); 145 #ifndef PRODUCT 146 void oop_print_on(oop obj, outputStream* st); 147 #endif 148 149 // Verification 150 void verify_on(outputStream* st); 151 void oop_verify_on(oop obj, outputStream* st); 152 }; 153 154 #endif