1 /* 2 * Copyright (c) 1997, 2010, 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 #include "oops/klassOop.hpp" 31 #include "oops/klassVtable.hpp" 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 klassOop _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). 40 klassOop _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). 41 int _vtable_len; // size of vtable for this klass 42 juint _alloc_size; // allocation profiling support 43 oop _component_mirror; // component type, as a java/lang/Class 44 45 public: 46 // Testing operation 47 bool oop_is_array() const { return true; } 48 49 // Instance variables 50 int dimension() const { return _dimension; } 51 void set_dimension(int dimension) { _dimension = dimension; } 52 53 klassOop higher_dimension() const { return _higher_dimension; } 54 void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); } 55 oop* adr_higher_dimension() { return (oop*)&this->_higher_dimension;} 56 57 klassOop lower_dimension() const { return _lower_dimension; } 58 void set_lower_dimension(klassOop k) { oop_store_without_check((oop*) &_lower_dimension, (oop) k); } 59 oop* adr_lower_dimension() { return (oop*)&this->_lower_dimension;} 60 61 // Allocation profiling support 62 juint alloc_size() const { return _alloc_size; } 63 void set_alloc_size(juint n) { _alloc_size = n; } 64 65 // offset of first element, including any padding for the sake of alignment 66 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } 67 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } 68 // type of elements (T_OBJECT for both oop arrays and array-arrays) 69 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } 70 71 oop component_mirror() const { return _component_mirror; } 72 void set_component_mirror(oop m) { oop_store((oop*) &_component_mirror, m); } 73 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;} 74 75 // Compiler/Interpreter offset 76 static ByteSize component_mirror_offset() { return byte_offset_of(arrayKlass, _component_mirror); } 77 78 virtual klassOop java_super() const;//{ return SystemDictionary::Object_klass(); } 79 80 // Allocation 81 // Sizes points to the first dimension of the array, subsequent dimensions 82 // are always in higher memory. The callers of these set that up. 83 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); 84 objArrayOop allocate_arrayArray(int n, int length, TRAPS); 85 86 // Lookup operations 87 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; 88 89 // Casting from klassOop 90 static arrayKlass* cast(klassOop k) { 91 Klass* kp = k->klass_part(); 92 assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass"); 93 return (arrayKlass*) kp; 94 } 95 96 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 97 bool compute_is_subtype_of(klassOop k); 98 99 // Sizing 100 static int header_size() { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; } 101 int object_size(int header_size) const; 102 103 bool object_is_parsable() const { return _vtable_len > 0; } 104 105 // Java vtable 106 klassVtable* vtable() const; // return new klassVtable 107 int vtable_length() const { return _vtable_len; } 108 static int base_vtable_length() { return Universe::base_vtable_size(); } 109 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } 110 protected: 111 inline intptr_t* start_of_vtable() const; 112 113 public: 114 // Iterators 115 void array_klasses_do(void f(klassOop k)); 116 void with_array_klasses_do(void f(klassOop k)); 117 118 // Shared creation method 119 static arrayKlassHandle base_create_array_klass( 120 const Klass_vtbl& vtbl, 121 int header_size, KlassHandle klass, 122 TRAPS); 123 // Return a handle. 124 static void complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS); 125 126 // jvm support 127 jint compute_modifier_flags(TRAPS) const; 128 129 // JVMTI support 130 jint jvmti_class_status() const; 131 132 // Printing 133 void oop_print_on(oop obj, outputStream* st); 134 135 // Verification 136 void oop_verify_on(oop obj, outputStream* st); 137 }; 138 139 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP