1 /*
  2  * Copyright (c) 2010, 2020, 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
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 23  */
 24 
 25 #ifndef SHARE_OOPS_OBJARRAYKLASS_INLINE_HPP
 26 #define SHARE_OOPS_OBJARRAYKLASS_INLINE_HPP
 27 
 28 #include "oops/objArrayKlass.hpp"
 29 
 30 #include "memory/memRegion.hpp"
 31 #include "memory/iterator.hpp"
 32 #include "oops/arrayKlass.hpp"
 33 #include "oops/arrayOop.hpp"
 34 #include "oops/klass.hpp"
 35 #include "oops/objArrayOop.inline.hpp"
 36 #include "oops/oop.inline.hpp"
 37 #include "utilities/macros.hpp"
 38 
 39 template <typename T, class OopClosureType>
 40 void ObjArrayKlass::oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure) {
 41   T* p         = (T*)a->base();
 42   T* const end = p + a->length();
 43 
 44   for (;p < end; p++) {
 45     Devirtualizer::do_oop(closure, p);
 46   }
 47 }
 48 
 49 template <typename T, class OopClosureType>
 50 void ObjArrayKlass::oop_oop_iterate_elements_bounded(
 51     objArrayOop a, OopClosureType* closure, void* low, void* high) {
 52 
 53   T* const l = (T*)low;
 54   T* const h = (T*)high;
 55 
 56   T* p   = (T*)a->base();
 57   T* end = p + a->length();
 58 
 59   if (p < l) {
 60     p = l;
 61   }
 62   if (end > h) {
 63     end = h;
 64   }
 65 
 66   for (;p < end; ++p) {
 67     Devirtualizer::do_oop(closure, p);
 68   }
 69 }
 70 
 71 template <typename T, typename OopClosureType>
 72 void ObjArrayKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
 73   assert (obj->is_array(), "obj must be array");
 74   objArrayOop a = objArrayOop(obj);
 75 
 76   if (Devirtualizer::do_metadata(closure)) {
 77     Devirtualizer::do_klass(closure, obj->klass());
 78   }
 79 
 80   oop_oop_iterate_elements<T>(a, closure);
 81 }
 82 
 83 template <typename T, typename OopClosureType>
 84 void ObjArrayKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
 85   // No reverse implementation ATM.
 86   oop_oop_iterate<T>(obj, closure);
 87 }
 88 
 89 template <typename T, typename OopClosureType>
 90 void ObjArrayKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
 91   assert(obj->is_array(), "obj must be array");
 92   objArrayOop a  = objArrayOop(obj);
 93 
 94   if (Devirtualizer::do_metadata(closure)) {
 95     Devirtualizer::do_klass(closure, a->klass());
 96   }
 97 
 98   oop_oop_iterate_elements_bounded<T>(a, closure, mr.start(), mr.end());
 99 }
100 
101 // Like oop_oop_iterate but only iterates over a specified range and only used
102 // for objArrayOops.
103 template <typename T, class OopClosureType>
104 void ObjArrayKlass::oop_oop_iterate_range(objArrayOop a, OopClosureType* closure, int start, int end) {
105   T* low = (T*)a->base() + start;
106   T* high = (T*)a->base() + end;
107 
108   oop_oop_iterate_elements_bounded<T>(a, closure, low, high);
109 }
110 
111 // Placed here to resolve include cycle between objArrayKlass.inline.hpp and objArrayOop.inline.hpp
112 template <typename OopClosureType>
113 void objArrayOopDesc::oop_iterate_range(OopClosureType* blk, int start, int end) {
114   if (UseCompressedOops) {
115     ((ObjArrayKlass*)klass())->oop_oop_iterate_range<narrowOop>(this, blk, start, end);
116   } else {
117     ((ObjArrayKlass*)klass())->oop_oop_iterate_range<oop>(this, blk, start, end);
118   }
119 }
120 
121 #endif // SHARE_OOPS_OBJARRAYKLASS_INLINE_HPP