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_OBJARRAYKLASS_HPP 26 #define SHARE_VM_OOPS_OBJARRAYKLASS_HPP 27 28 #include "memory/specialized_oop_closures.hpp" 29 #include "oops/arrayKlass.hpp" 30 #include "oops/instanceKlass.hpp" 31 32 // objArrayKlass is the klass for objArrays 33 34 class objArrayKlass : public arrayKlass { 35 friend class VMStructs; 36 private: 37 klassOop _element_klass; // The klass of the elements of this array type 38 klassOop _bottom_klass; // The one-dimensional type (instanceKlass or typeArrayKlass) 39 public: 40 // Instance variables 41 klassOop element_klass() const { return _element_klass; } 42 void set_element_klass(klassOop k) { oop_store_without_check((oop*) &_element_klass, (oop) k); } 43 oop* element_klass_addr() { return (oop*)&_element_klass; } 44 45 klassOop bottom_klass() const { return _bottom_klass; } 46 void set_bottom_klass(klassOop k) { oop_store_without_check((oop*) &_bottom_klass, (oop) k); } 47 oop* bottom_klass_addr() { return (oop*)&_bottom_klass; } 48 49 // Compiler/Interpreter offset 50 static int element_klass_offset_in_bytes() { return offset_of(objArrayKlass, _element_klass); } 51 52 // Dispatched operation 53 bool can_be_primary_super_slow() const; 54 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 55 bool compute_is_subtype_of(klassOop k); 56 bool oop_is_objArray_slow() const { return true; } 57 int oop_size(oop obj) const; 58 int klass_oop_size() const { return object_size(); } 59 60 // Allocation 61 DEFINE_ALLOCATE_PERMANENT(objArrayKlass); 62 objArrayOop allocate(int length, TRAPS); 63 oop multi_allocate(int rank, jint* sizes, TRAPS); 64 65 // Copying 66 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); 67 68 // Compute protection domain 69 oop protection_domain() { return Klass::cast(bottom_klass())->protection_domain(); } 70 // Compute class loader 71 oop class_loader() const { return Klass::cast(bottom_klass())->class_loader(); } 72 73 private: 74 // Either oop or narrowOop depending on UseCompressedOops. 75 // must be called from within objArrayKlass.cpp 76 template <class T> void do_copy(arrayOop s, T* src, arrayOop d, 77 T* dst, int length, TRAPS); 78 protected: 79 // Returns the objArrayKlass for n'th dimension. 80 virtual klassOop array_klass_impl(bool or_null, int n, TRAPS); 81 82 // Returns the array class with this class as element type. 83 virtual klassOop array_klass_impl(bool or_null, TRAPS); 84 85 public: 86 // Casting from klassOop 87 static objArrayKlass* cast(klassOop k) { 88 assert(k->klass_part()->oop_is_objArray_slow(), "cast to objArrayKlass"); 89 return (objArrayKlass*) k->klass_part(); 90 } 91 92 // Sizing 93 static int header_size() { return oopDesc::header_size() + sizeof(objArrayKlass)/HeapWordSize; } 94 int object_size() const { return arrayKlass::object_size(header_size()); } 95 96 // Initialization (virtual from Klass) 97 void initialize(TRAPS); 98 99 // Garbage collection 100 void oop_follow_contents(oop obj); 101 inline void oop_follow_contents(oop obj, int index); 102 template <class T> inline void objarray_follow_contents(oop obj, int index); 103 104 int oop_adjust_pointers(oop obj); 105 106 // Parallel Scavenge and Parallel Old 107 PARALLEL_GC_DECLS 108 #ifndef SERIALGC 109 inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index); 110 template <class T> inline void 111 objarray_follow_contents(ParCompactionManager* cm, oop obj, int index); 112 #endif // !SERIALGC 113 114 // Iterators 115 int oop_oop_iterate(oop obj, OopClosure* blk) { 116 return oop_oop_iterate_v(obj, blk); 117 } 118 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 119 return oop_oop_iterate_v_m(obj, blk, mr); 120 } 121 #define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 122 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 123 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 124 MemRegion mr); \ 125 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk, \ 126 int start, int end); 127 128 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL) 129 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL) 130 131 // JVM support 132 jint compute_modifier_flags(TRAPS) const; 133 134 private: 135 static klassOop array_klass_impl (objArrayKlassHandle this_oop, bool or_null, int n, TRAPS); 136 137 public: 138 // Printing 139 void oop_print_value_on(oop obj, outputStream* st); 140 #ifndef PRODUCT 141 void oop_print_on (oop obj, outputStream* st); 142 #endif //PRODUCT 143 144 // Verification 145 const char* internal_name() const; 146 void oop_verify_on(oop obj, outputStream* st); 147 void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty); 148 void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty); 149 }; 150 151 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP