1 /*
   2  * Copyright (c) 1997, 2009, 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 // A typeArrayKlass is the klass of a typeArray
  26 // It contains the type and size of the elements
  27 
  28 class typeArrayKlass : public arrayKlass {
  29   friend class VMStructs;
  30  private:
  31   jint _max_length;            // maximum number of elements allowed in an array
  32  public:
  33   // instance variables
  34   jint max_length()                     { return _max_length; }
  35   void set_max_length(jint m)           { _max_length = m;    }
  36 
  37   // testers
  38   bool oop_is_typeArray_slow() const    { return true; }
  39 
  40   // klass allocation
  41   DEFINE_ALLOCATE_PERMANENT(typeArrayKlass);
  42   static klassOop create_klass(BasicType type, int scale, const char* name_str,
  43                                TRAPS);
  44   static inline klassOop create_klass(BasicType type, int scale, TRAPS) {
  45     return create_klass(type, scale, external_name(type), CHECK_NULL);
  46   }
  47 
  48   int oop_size(oop obj) const;
  49   int klass_oop_size() const  { return object_size(); }
  50 
  51   bool compute_is_subtype_of(klassOop k);
  52 
  53   // Allocation
  54   typeArrayOop allocate(int length, TRAPS);
  55   typeArrayOop allocate_permanent(int length, TRAPS);  // used for class file structures
  56   oop multi_allocate(int rank, jint* sizes, TRAPS);
  57 
  58   // Copying
  59   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
  60 
  61   // Iteration
  62   int oop_oop_iterate(oop obj, OopClosure* blk);
  63   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
  64 
  65   // Garbage collection
  66   void oop_follow_contents(oop obj);
  67   int  oop_adjust_pointers(oop obj);
  68 
  69   // Parallel Scavenge and Parallel Old
  70   PARALLEL_GC_DECLS
  71 
  72  protected:
  73   // Find n'th dimensional array
  74   virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
  75 
  76   // Returns the array class with this class as element type
  77   virtual klassOop array_klass_impl(bool or_null, TRAPS);
  78 
  79  public:
  80   // Casting from klassOop
  81   static typeArrayKlass* cast(klassOop k) {
  82     assert(k->klass_part()->oop_is_typeArray_slow(), "cast to typeArrayKlass");
  83     return (typeArrayKlass*) k->klass_part();
  84   }
  85 
  86   // Naming
  87   static const char* external_name(BasicType type);
  88 
  89   // Sizing
  90   static int header_size()  { return oopDesc::header_size() + sizeof(typeArrayKlass)/HeapWordSize; }
  91   int object_size() const   { return arrayKlass::object_size(header_size()); }
  92 
  93   // Initialization (virtual from Klass)
  94   void initialize(TRAPS);
  95 
  96  private:
  97    // Helpers
  98    static klassOop array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS);
  99 
 100 #ifndef PRODUCT
 101  public:
 102   // Printing
 103   void oop_print_on(oop obj, outputStream* st);
 104 #endif
 105  public:
 106   const char* internal_name() const;
 107 };