1 /* 2 * Copyright (c) 1997, 2013, 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 klassVtable; 32 33 // ArrayKlass is the abstract baseclass for all array classes 34 35 class ArrayKlass: public Klass { 36 friend class VMStructs; 37 private: 38 int _dimension; // This is n'th-dimensional array. 39 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). 40 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). 41 int _vtable_len; // size of vtable for this klass 42 oop _component_mirror; // component type, as a java/lang/Class 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 oop component_mirror() const { return _component_mirror; } 74 void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); } 75 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;} 76 77 // Compiler/Interpreter offset 78 static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); } 79 80 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } 81 82 // Allocation 83 // Sizes points to the first dimension of the array, subsequent dimensions 84 // are always in higher memory. The callers of these set that up. 85 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); 86 objArrayOop allocate_arrayArray(int n, int length, TRAPS); 87 88 // Lookup operations 89 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; 90 91 // Casting from Klass* 92 static ArrayKlass* cast(Klass* k) { 93 assert(k->oop_is_array(), "cast to ArrayKlass"); 94 return (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 int vtable_length() const { return _vtable_len; } 115 static int base_vtable_length() { return Universe::base_vtable_size(); } 116 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } 117 protected: 118 inline intptr_t* start_of_vtable() const; 119 120 public: 121 // Iterators 122 void array_klasses_do(void f(Klass* k)); 123 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 124 125 // GC support 126 virtual void oops_do(OopClosure* cl); 127 128 // Return a handle. 129 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS); 130 131 132 // jvm support 133 jint compute_modifier_flags(TRAPS) const; 134 135 // JVMTI support 136 jint jvmti_class_status() const; 137 138 // CDS support - remove and restore oops from metadata. Oops are not shared. 139 virtual void remove_unshareable_info(); 140 virtual void restore_unshareable_info(TRAPS); 141 142 // Printing 143 void print_on(outputStream* st) const; 144 void print_value_on(outputStream* st) const; 145 146 void oop_print_on(oop obj, outputStream* st); 147 148 // Verification 149 void verify_on(outputStream* st); 150 151 void oop_verify_on(oop obj, outputStream* st); 152 }; 153 154 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP