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_TYPEARRAYKLASS_HPP
  26 #define SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
  27 
  28 #include "oops/arrayKlass.hpp"
  29 
  30 // A typeArrayKlass is the klass of a typeArray
  31 // It contains the type and size of the elements
  32 
  33 class typeArrayKlass : public arrayKlass {
  34   friend class VMStructs;
  35  private:
  36   jint _max_length;            // maximum number of elements allowed in an array
  37  public:
  38   // instance variables
  39   jint max_length()                     { return _max_length; }
  40   void set_max_length(jint m)           { _max_length = m;    }
  41 
  42   // testers
  43   bool oop_is_typeArray_slow() const    { return true; }
  44 
  45   // klass allocation
  46   DEFINE_ALLOCATE_PERMANENT(typeArrayKlass);
  47   static klassOop create_klass(BasicType type, int scale, const char* name_str,
  48                                TRAPS);
  49   static inline klassOop create_klass(BasicType type, int scale, TRAPS) {
  50     return create_klass(type, scale, external_name(type), CHECK_NULL);
  51   }
  52 
  53   int oop_size(oop obj) const;
  54   int klass_oop_size() const  { return object_size(); }
  55 
  56   bool compute_is_subtype_of(klassOop k);
  57 
  58   // Allocation
  59   typeArrayOop allocate_common(int length, bool nozero, TRAPS);
  60   typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, false, THREAD); }
  61   typeArrayOop allocate_permanent(int length, TRAPS);  // used for class file structures
  62   oop multi_allocate(int rank, jint* sizes, TRAPS);
  63 
  64   // Copying
  65   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
  66 
  67   // Iteration
  68   int oop_oop_iterate(oop obj, OopClosure* blk);
  69   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
  70 
  71   // Garbage collection
  72   void oop_follow_contents(oop obj);
  73   int  oop_adjust_pointers(oop obj);
  74 
  75   // Parallel Scavenge and Parallel Old
  76   PARALLEL_GC_DECLS
  77 
  78  protected:
  79   // Find n'th dimensional array
  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 typeArrayKlass* cast(klassOop k) {
  88     assert(k->klass_part()->oop_is_typeArray_slow(), "cast to typeArrayKlass");
  89     return (typeArrayKlass*) k->klass_part();
  90   }
  91 
  92   // Naming
  93   static const char* external_name(BasicType type);
  94 
  95   // Sizing
  96   static int header_size()  { return oopDesc::header_size() + sizeof(typeArrayKlass)/HeapWordSize; }
  97   int object_size() const   { return arrayKlass::object_size(header_size()); }
  98 
  99   // Initialization (virtual from Klass)
 100   void initialize(TRAPS);
 101 
 102  private:
 103    // Helpers
 104    static klassOop array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS);
 105 
 106 #ifndef PRODUCT
 107  public:
 108   // Printing
 109   void oop_print_on(oop obj, outputStream* st);
 110 #endif
 111  public:
 112   const char* internal_name() const;
 113 };
 114 
 115 #endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP