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_ARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP 27 28 #include "memory/universe.hpp" 29 #include "oops/klass.hpp" 30 31 class fieldDescriptor; 32 class klassVtable; 33 34 // ArrayKlass is the abstract baseclass for all array classes 35 36 class ArrayKlass: public Klass { 37 friend class VMStructs; 38 private: 39 int _dimension; // This is n'th-dimensional array. 40 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). 41 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). 42 43 protected: 44 // Constructors 45 // The constructor with the Symbol argument does the real array 46 // initialization, the other is a dummy 47 ArrayKlass(Symbol* name); 48 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); } 49 50 public: 51 // Testing operation 52 DEBUG_ONLY(bool is_array_klass_slow() const { return true; }) 53 54 // Instance variables 55 int dimension() const { return _dimension; } 56 void set_dimension(int dimension) { _dimension = dimension; } 57 58 Klass* higher_dimension() const { return _higher_dimension; } 59 void set_higher_dimension(Klass* k) { _higher_dimension = k; } 60 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;} 61 62 Klass* lower_dimension() const { return _lower_dimension; } 63 void set_lower_dimension(Klass* k) { _lower_dimension = k; } 64 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;} 65 66 // offset of first element, including any padding for the sake of alignment 67 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } 68 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } 69 // type of elements (T_OBJECT for both oop arrays and array-arrays) 70 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } 71 72 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } 73 74 // Allocation 75 // Sizes points to the first dimension of the array, subsequent dimensions 76 // are always in higher memory. The callers of these set that up. 77 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); 78 objArrayOop allocate_arrayArray(int n, int length, TRAPS); 79 80 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 81 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 82 83 // Lookup operations 84 Method* uncached_lookup_method(const Symbol* name, 85 const Symbol* signature, 86 OverpassLookupMode overpass_mode) const; 87 88 static ArrayKlass* cast(Klass* k) { 89 return const_cast<ArrayKlass*>(cast(const_cast<const Klass*>(k))); 90 } 91 92 static const ArrayKlass* cast(const Klass* k) { 93 assert(k->is_array_klass(), "cast to ArrayKlass"); 94 return static_cast<const ArrayKlass*>(k); 95 } 96 97 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 98 bool compute_is_subtype_of(Klass* k); 99 100 // Sizing 101 static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; } 102 static int static_size(int header_size); 103 104 #if INCLUDE_SERVICES 105 virtual void collect_statistics(KlassSizeStats *sz) const { 106 Klass::collect_statistics(sz); 107 // Do nothing for now, but remember to modify if you add new 108 // stuff to ArrayKlass. 109 } 110 #endif 111 112 // Java vtable 113 klassVtable* vtable() const; // return new klassVtable 114 protected: 115 inline intptr_t* start_of_vtable() const; 116 117 public: 118 // Iterators 119 void array_klasses_do(void f(Klass* k)); 120 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 121 122 // Return a handle. 123 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS); 124 125 126 // jvm support 127 jint compute_modifier_flags(TRAPS) const; 128 129 // JVMTI support 130 jint jvmti_class_status() const; 131 132 // CDS support - remove and restore oops from metadata. Oops are not shared. 133 virtual void remove_unshareable_info(); 134 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 135 136 // Printing 137 void print_on(outputStream* st) const; 138 void print_value_on(outputStream* st) const; 139 140 void oop_print_on(oop obj, outputStream* st); 141 142 // Verification 143 void verify_on(outputStream* st); 144 145 void oop_verify_on(oop obj, outputStream* st); 146 }; 147 148 // Array oop iteration macros for declarations. 149 // Used to generate the declarations in the *ArrayKlass header files. 150 151 #define OOP_OOP_ITERATE_DECL_RANGE(OopClosureType, nv_suffix) \ 152 void oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end); 153 154 #if INCLUDE_ALL_GCS 155 // Named NO_BACKWARDS because the definition used by *ArrayKlass isn't reversed, see below. 156 #define OOP_OOP_ITERATE_DECL_NO_BACKWARDS(OopClosureType, nv_suffix) \ 157 void oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure); 158 #endif // INCLUDE_ALL_GCS 159 160 161 // Array oop iteration macros for definitions. 162 // Used to generate the definitions in the *ArrayKlass.inline.hpp files. 163 164 #define OOP_OOP_ITERATE_DEFN_RANGE(KlassType, OopClosureType, nv_suffix) \ 165 \ 166 void KlassType::oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end) { \ 167 oop_oop_iterate_range<nvs_to_bool(nv_suffix)>(obj, closure, start, end); \ 168 } 169 170 #if INCLUDE_ALL_GCS 171 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) \ 172 void KlassType::oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \ 173 /* No reverse implementation ATM. */ \ 174 oop_oop_iterate<nvs_to_bool(nv_suffix)>(obj, closure); \ 175 } 176 #else 177 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) 178 #endif 179 180 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP