1 /*
   2  * Copyright (c) 2010, 2018, 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_INLINE_HPP
  26 #define SHARE_VM_OOPS_OBJARRAYKLASS_INLINE_HPP
  27 
  28 #include "memory/memRegion.hpp"
  29 #include "memory/iterator.inline.hpp"
  30 #include "oops/arrayOop.inline.hpp"
  31 #include "oops/arrayKlass.hpp"
  32 #include "oops/klass.hpp"
  33 #include "oops/objArrayKlass.hpp"
  34 #include "oops/objArrayOop.inline.hpp"
  35 #include "oops/oop.inline.hpp"
  36 #include "utilities/macros.hpp"
  37 
  38 template <bool nv, typename T, class OopClosureType>
  39 void ObjArrayKlass::oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure) {
  40   T* p         = (T*)a->base_raw();
  41   T* const end = p + a->length();
  42 
  43   for (;p < end; p++) {
  44     Devirtualizer<nv>::do_oop(closure, p);
  45   }
  46 }
  47 
  48 template <bool nv, typename T, class OopClosureType>
  49 void ObjArrayKlass::oop_oop_iterate_elements_specialized_bounded(
  50     objArrayOop a, OopClosureType* closure, void* low, void* high) {
  51 
  52   T* const l = (T*)low;
  53   T* const h = (T*)high;
  54 
  55   T* p   = (T*)a->base_raw();
  56   T* end = p + a->length();
  57 
  58   if (p < l) {
  59     p = l;
  60   }
  61   if (end > h) {
  62     end = h;
  63   }
  64 
  65   for (;p < end; ++p) {
  66     Devirtualizer<nv>::do_oop(closure, p);
  67   }
  68 }
  69 
  70 template <bool nv, class OopClosureType>
  71 void ObjArrayKlass::oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure) {
  72   if (UseCompressedOops) {
  73     oop_oop_iterate_elements_specialized<nv, narrowOop>(a, closure);
  74   } else {
  75     oop_oop_iterate_elements_specialized<nv, oop>(a, closure);
  76   }
  77 }
  78 
  79 template <bool nv, class OopClosureType>
  80 void ObjArrayKlass::oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr) {
  81   if (UseCompressedOops) {
  82     oop_oop_iterate_elements_specialized_bounded<nv, narrowOop>(a, closure, mr.start(), mr.end());
  83   } else {
  84     oop_oop_iterate_elements_specialized_bounded<nv, oop>(a, closure, mr.start(), mr.end());
  85   }
  86 }
  87 
  88 template <bool nv, typename OopClosureType>
  89 void ObjArrayKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
  90   assert (obj->is_array(), "obj must be array");
  91   objArrayOop a = objArrayOop(obj);
  92 
  93   if (Devirtualizer<nv>::do_metadata(closure)) {
  94     Devirtualizer<nv>::do_klass(closure, obj->klass());
  95   }
  96 
  97   oop_oop_iterate_elements<nv>(a, closure);
  98 }
  99 
 100 template <bool nv, typename OopClosureType>
 101 void ObjArrayKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
 102   assert(obj->is_array(), "obj must be array");
 103   objArrayOop a  = objArrayOop(obj);
 104 
 105   if (Devirtualizer<nv>::do_metadata(closure)) {
 106     Devirtualizer<nv>::do_klass(closure, a->klass());
 107   }
 108 
 109   oop_oop_iterate_elements_bounded<nv>(a, closure, mr);
 110 }
 111 
 112 template <bool nv, typename T, class OopClosureType>
 113 void ObjArrayKlass::oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end) {
 114   T* low = start == 0 ? cast_from_oop<T*>(a) : a->obj_at_addr_raw<T>(start);
 115   T* high = (T*)a->base_raw() + end;
 116 
 117   oop_oop_iterate_elements_specialized_bounded<nv, T>(a, closure, low, high);
 118 }
 119 
 120 // Like oop_oop_iterate but only iterates over a specified range and only used
 121 // for objArrayOops.
 122 template <bool nv, class OopClosureType>
 123 void ObjArrayKlass::oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end) {
 124   assert(obj->is_array(), "obj must be array");
 125   objArrayOop a  = objArrayOop(obj);
 126 
 127   if (UseCompressedOops) {
 128     oop_oop_iterate_range_specialized<nv, narrowOop>(a, closure, start, end);
 129   } else {
 130     oop_oop_iterate_range_specialized<nv, oop>(a, closure, start, end);
 131   }
 132 }
 133 
 134 #define ALL_OBJ_ARRAY_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)    \
 135   OOP_OOP_ITERATE_DEFN(             ObjArrayKlass, OopClosureType, nv_suffix)  \
 136   OOP_OOP_ITERATE_DEFN_BOUNDED(     ObjArrayKlass, OopClosureType, nv_suffix)  \
 137   OOP_OOP_ITERATE_DEFN_RANGE(       ObjArrayKlass, OopClosureType, nv_suffix)  \
 138   OOP_OOP_ITERATE_DEFN_NO_BACKWARDS(ObjArrayKlass, OopClosureType, nv_suffix)
 139 
 140 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_INLINE_HPP