1 /* 2 * Copyright (c) 1997, 2015, 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 int _vtable_len; // size of vtable for this klass 43 44 protected: 45 // Constructors 46 // The constructor with the Symbol argument does the real array 47 // initialization, the other is a dummy 48 ArrayKlass(Symbol* name); 49 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); } 50 51 public: 52 // Testing operation 53 bool oop_is_array_slow() const { return true; } 54 55 // Instance variables 56 int dimension() const { return _dimension; } 57 void set_dimension(int dimension) { _dimension = dimension; } 58 59 Klass* higher_dimension() const { return _higher_dimension; } 60 void set_higher_dimension(Klass* k) { _higher_dimension = k; } 61 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;} 62 63 Klass* lower_dimension() const { return _lower_dimension; } 64 void set_lower_dimension(Klass* k) { _lower_dimension = k; } 65 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;} 66 67 // offset of first element, including any padding for the sake of alignment 68 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } 69 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } 70 // type of elements (T_OBJECT for both oop arrays and array-arrays) 71 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } 72 73 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } 74 75 // Allocation 76 // Sizes points to the first dimension of the array, subsequent dimensions 77 // are always in higher memory. The callers of these set that up. 78 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); 79 objArrayOop allocate_arrayArray(int n, int length, TRAPS); 80 81 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 82 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 83 84 // Lookup operations 85 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const; 86 87 // Casting from Klass* 88 static ArrayKlass* cast(Klass* k) { 89 assert(k->oop_is_array(), "cast to ArrayKlass"); 90 return (ArrayKlass*) k; 91 } 92 93 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 94 bool compute_is_subtype_of(Klass* k); 95 96 // Sizing 97 static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; } 98 static int static_size(int header_size); 99 100 #if INCLUDE_SERVICES 101 virtual void collect_statistics(KlassSizeStats *sz) const { 102 Klass::collect_statistics(sz); 103 // Do nothing for now, but remember to modify if you add new 104 // stuff to ArrayKlass. 105 } 106 #endif 107 108 // Java vtable 109 klassVtable* vtable() const; // return new klassVtable 110 int vtable_length() const { return _vtable_len; } 111 static int base_vtable_length() { return Universe::base_vtable_size(); } 112 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } 113 protected: 114 inline intptr_t* start_of_vtable() const; 115 116 public: 117 // Iterators 118 void array_klasses_do(void f(Klass* k)); 119 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 120 121 // Return a handle. 122 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS); 123 124 125 // jvm support 126 jint compute_modifier_flags(TRAPS) const; 127 128 // JVMTI support 129 jint jvmti_class_status() const; 130 131 // CDS support - remove and restore oops from metadata. Oops are not shared. 132 virtual void remove_unshareable_info(); 133 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 134 135 // Printing 136 void print_on(outputStream* st) const; 137 void print_value_on(outputStream* st) const; 138 139 void oop_print_on(oop obj, outputStream* st); 140 141 // Verification 142 void verify_on(outputStream* st); 143 144 void oop_verify_on(oop obj, outputStream* st); 145 }; 146 147 // Array oop iteration macros for declarations. 148 // Used to generate the declarations in the *ArrayKlass header files. 149 150 #define OOP_OOP_ITERATE_DECL_RANGE(OopClosureType, nv_suffix) \ 151 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end); 152 153 #if INCLUDE_ALL_GCS 154 // Named NO_BACKWARDS because the definition used by *ArrayKlass isn't reversed, see below. 155 #define OOP_OOP_ITERATE_DECL_NO_BACKWARDS(OopClosureType, nv_suffix) \ 156 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure); 157 #endif // INCLUDE_ALL_GCS 158 159 160 // Array oop iteration macros for definitions. 161 // Used to generate the definitions in the *ArrayKlass.inline.hpp files. 162 163 #define OOP_OOP_ITERATE_DEFN_RANGE(KlassType, OopClosureType, nv_suffix) \ 164 \ 165 int KlassType::oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* closure, int start, int end) { \ 166 return oop_oop_iterate_range<nvs_to_bool(nv_suffix)>(obj, closure, start, end); \ 167 } 168 169 #if INCLUDE_ALL_GCS 170 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) \ 171 int KlassType::oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \ 172 /* No reverse implementation ATM. */ \ 173 return oop_oop_iterate<nvs_to_bool(nv_suffix)>(obj, closure); \ 174 } 175 #else 176 #define OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(KlassType, OopClosureType, nv_suffix) 177 #endif 178 179 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP