1 /* 2 * Copyright (c) 2011, 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_INSTANCECLASSLOADERKLASS_HPP 26 #define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP 27 28 #include "memory/specialized_oop_closures.hpp" 29 #include "oops/instanceKlass.hpp" 30 #include "utilities/macros.hpp" 31 32 // An InstanceClassLoaderKlass is a specialization of the InstanceKlass. It does 33 // not add any field. It is added to walk the dependencies for the class loader 34 // key that this class loader points to. This is how the loader_data graph is 35 // walked and dependant class loaders are kept alive. I thought we walked 36 // the list later? 37 38 class InstanceClassLoaderKlass: public InstanceKlass { 39 friend class VMStructs; 40 friend class InstanceKlass; 41 42 // Constructor 43 InstanceClassLoaderKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous) 44 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {} 45 46 public: 47 virtual bool oop_is_instanceClassLoader() const { return true; } 48 49 InstanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 50 51 // GC specific object visitors 52 // 53 // Mark Sweep 54 void oop_ms_follow_contents(oop obj); 55 int oop_ms_adjust_pointers(oop obj); 56 #if INCLUDE_ALL_GCS 57 // Parallel Scavenge 58 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 59 // Parallel Compact 60 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 61 void oop_pc_update_pointers(oop obj); 62 #endif 63 64 // Oop fields (and metadata) iterators 65 // [nv = true] Use non-virtual calls to do_oop_nv. 66 // [nv = false] Use virtual calls to do_oop. 67 // 68 // The InstanceClassLoaderKlass iterators also visit the CLD pointer (or mirror of anonymous klasses.) 69 70 private: 71 // Forward iteration 72 // Iterate over the oop fields and metadata. 73 template <bool nv, class OopClosureType> 74 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 75 76 #if INCLUDE_ALL_GCS 77 // Reverse iteration 78 // Iterate over the oop fields and metadata. 79 template <bool nv, class OopClosureType> 80 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 81 #endif 82 83 // Bounded range iteration 84 // Iterate over the oop fields and metadata. 85 template <bool nv, class OopClosureType> 86 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 87 88 public: 89 90 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 91 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 92 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); 93 94 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL) 95 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL) 96 97 #if INCLUDE_ALL_GCS 98 #define InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 99 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 100 101 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 102 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 103 #endif // INCLUDE_ALL_GCS 104 105 }; 106 107 #endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP