rev 49674 : 8198285: More consistent Access API for arraycopy

   1 /*
   2  * Copyright (c) 1997, 2017, 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.
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   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
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  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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  24 
  25 #ifndef SHARE_VM_OOPS_OBJARRAYKLASS_HPP
  26 #define SHARE_VM_OOPS_OBJARRAYKLASS_HPP
  27 
  28 #include "classfile/classLoaderData.hpp"
  29 #include "oops/arrayKlass.hpp"
  30 #include "utilities/macros.hpp"
  31 
  32 // ObjArrayKlass is the klass for objArrays
  33 
  34 class ObjArrayKlass : public ArrayKlass {
  35   friend class VMStructs;
  36   friend class JVMCIVMStructs;
  37  private:
  38   // If you add a new field that points to any metaspace object, you
  39   // must add this field to ObjArrayKlass::metaspace_pointers_do().
  40   Klass* _element_klass;            // The klass of the elements of this array type
  41   Klass* _bottom_klass;             // The one-dimensional type (InstanceKlass or TypeArrayKlass)
  42 
  43   // Constructor
  44   ObjArrayKlass(int n, Klass* element_klass, Symbol* name);
  45   static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, Klass* k, Symbol* name, TRAPS);
  46  public:
  47   // For dummy objects
  48   ObjArrayKlass() {}
  49 
  50   // Instance variables
  51   Klass* element_klass() const      { return _element_klass; }
  52   void set_element_klass(Klass* k)  { _element_klass = k; }
  53   Klass** element_klass_addr()      { return &_element_klass; }
  54 
  55   Klass* bottom_klass() const       { return _bottom_klass; }
  56   void set_bottom_klass(Klass* k)   { _bottom_klass = k; }
  57   Klass** bottom_klass_addr()       { return &_bottom_klass; }
  58 
  59   ModuleEntry* module() const;
  60   PackageEntry* package() const;
  61 
  62   // Compiler/Interpreter offset
  63   static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); }
  64 
  65   // Dispatched operation
  66   bool can_be_primary_super_slow() const;
  67   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
  68   bool compute_is_subtype_of(Klass* k);
  69   DEBUG_ONLY(bool is_objArray_klass_slow()  const  { return true; })
  70   int oop_size(oop obj) const;
  71 
  72   // Allocation
  73   static Klass* allocate_objArray_klass(ClassLoaderData* loader_data,
  74                                           int n, Klass* element_klass, TRAPS);
  75 
  76   objArrayOop allocate(int length, TRAPS);
  77   oop multi_allocate(int rank, jint* sizes, TRAPS);
  78 
  79   // Copying
  80   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
  81 
  82   // Compute protection domain
  83   oop protection_domain() const { return bottom_klass()->protection_domain(); }
  84 
  85   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
  86 
  87  private:
  88   // Either oop or narrowOop depending on UseCompressedOops.
  89   // must be called from within ObjArrayKlass.cpp
  90   template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
  91                                   T* dst, int length, TRAPS);

  92  protected:
  93   // Returns the ObjArrayKlass for n'th dimension.
  94   virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
  95 
  96   // Returns the array class with this class as element type.
  97   virtual Klass* array_klass_impl(bool or_null, TRAPS);
  98 
  99  public:
 100 
 101   static ObjArrayKlass* cast(Klass* k) {
 102     return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k)));
 103   }
 104 
 105   static const ObjArrayKlass* cast(const Klass* k) {
 106     assert(k->is_objArray_klass(), "cast to ObjArrayKlass");
 107     return static_cast<const ObjArrayKlass*>(k);
 108   }
 109 
 110   // Sizing
 111   static int header_size()                { return sizeof(ObjArrayKlass)/wordSize; }
 112   int size() const                        { return ArrayKlass::static_size(header_size()); }
 113 
 114   // Initialization (virtual from Klass)
 115   void initialize(TRAPS);
 116 
 117   // GC specific object visitors
 118   //
 119 #if INCLUDE_ALL_GCS
 120   // Parallel Scavenge
 121   void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);
 122   // Parallel Compact
 123   void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
 124   void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
 125 #endif
 126 
 127   // Oop fields (and metadata) iterators
 128   //  [nv = true]  Use non-virtual calls to do_oop_nv.
 129   //  [nv = false] Use virtual calls to do_oop.
 130   //
 131   // The ObjArrayKlass iterators also visits the Object's klass.
 132 
 133  private:
 134 
 135   // Iterate over oop elements and metadata.
 136   template <bool nv, typename OopClosureType>
 137   inline void oop_oop_iterate(oop obj, OopClosureType* closure);
 138 
 139   // Iterate over oop elements within mr, and metadata.
 140   template <bool nv, typename OopClosureType>
 141   inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
 142 
 143   // Iterate over oop elements with indices within [start, end), and metadata.
 144   template <bool nv, class OopClosureType>
 145   inline void oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end);
 146 
 147   // Iterate over oop elements within [start, end), and metadata.
 148   // Specialized for [T = oop] or [T = narrowOop].
 149   template <bool nv, typename T, class OopClosureType>
 150   inline void oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end);
 151 
 152  public:
 153   // Iterate over all oop elements.
 154   template <bool nv, class OopClosureType>
 155   inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure);
 156 
 157  private:
 158   // Iterate over all oop elements.
 159   // Specialized for [T = oop] or [T = narrowOop].
 160   template <bool nv, typename T, class OopClosureType>
 161   inline void oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure);
 162 
 163   // Iterate over all oop elements with indices within mr.
 164   template <bool nv, class OopClosureType>
 165   inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr);
 166 
 167   // Iterate over oop elements within [low, high)..
 168   // Specialized for [T = oop] or [T = narrowOop].
 169   template <bool nv, typename T, class OopClosureType>
 170   inline void oop_oop_iterate_elements_specialized_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high);
 171 
 172 
 173  public:
 174 
 175   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
 176   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
 177   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_RANGE)
 178   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_RANGE)
 179 
 180 #if INCLUDE_ALL_GCS
 181   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_NO_BACKWARDS)
 182   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_NO_BACKWARDS)
 183 #endif // INCLUDE_ALL_GCS
 184 
 185   // JVM support
 186   jint compute_modifier_flags(TRAPS) const;
 187 
 188  public:
 189   // Printing
 190   void print_on(outputStream* st) const;
 191   void print_value_on(outputStream* st) const;
 192 
 193   void oop_print_value_on(oop obj, outputStream* st);
 194 #ifndef PRODUCT
 195   void oop_print_on      (oop obj, outputStream* st);
 196 #endif //PRODUCT
 197 
 198   const char* internal_name() const;
 199 
 200   // Verification
 201   void verify_on(outputStream* st);
 202 
 203   void oop_verify_on(oop obj, outputStream* st);
 204 };
 205 
 206 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP
--- EOF ---