1 #ifdef USE_PRAGMA_IDENT_HDR
   2 #pragma ident "@(#)typeArrayKlass.hpp   1.69 07/05/29 09:44:25 JVM"
   3 #endif
   4 /*
   5  * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This code is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 only, as
  10  * published by the Free Software Foundation.
  11  *
  12  * This code is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * version 2 for more details (a copy is included in the LICENSE file that
  16  * accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License version
  19  * 2 along with this work; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *  
  26  */
  27 
  28 // A typeArrayKlass is the klass of a typeArray
  29 // It contains the type and size of the elements
  30 
  31 class typeArrayKlass : public arrayKlass {
  32   friend class VMStructs;
  33  private:
  34   jint _max_length;            // maximum number of elements allowed in an array
  35  public:
  36   // instance variables
  37   jint max_length()                     { return _max_length; }
  38   void set_max_length(jint m)           { _max_length = m;    }
  39 
  40   // testers
  41   bool oop_is_typeArray_slow() const    { return true; }
  42 
  43   // klass allocation
  44   DEFINE_ALLOCATE_PERMANENT(typeArrayKlass);
  45   static klassOop create_klass(BasicType type, int scale, const char* name_str,
  46                                TRAPS);
  47   static inline klassOop create_klass(BasicType type, int scale, TRAPS) {
  48     return create_klass(type, scale, external_name(type), CHECK_NULL);
  49   }
  50 
  51   int oop_size(oop obj) const;
  52   int klass_oop_size() const  { return object_size(); }
  53 
  54   bool compute_is_subtype_of(klassOop k);
  55 
  56   // Allocation
  57   typeArrayOop allocate(int length, TRAPS);
  58   typeArrayOop allocate_permanent(int length, TRAPS);  // used for class file structures
  59   oop multi_allocate(int rank, jint* sizes, TRAPS);
  60 
  61   // Copying
  62   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
  63 
  64   // Iteration
  65   int oop_oop_iterate(oop obj, OopClosure* blk);
  66   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
  67 
  68   // Garbage collection
  69   void oop_follow_contents(oop obj);
  70   int  oop_adjust_pointers(oop obj);
  71 
  72   // Parallel Scavenge and Parallel Old
  73   PARALLEL_GC_DECLS
  74 
  75  protected:
  76   // Find n'th dimensional array
  77   virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
  78 
  79   // Returns the array class with this class as element type
  80   virtual klassOop array_klass_impl(bool or_null, TRAPS);
  81 
  82  public:
  83   // Casting from klassOop
  84   static typeArrayKlass* cast(klassOop k) {
  85     assert(k->klass_part()->oop_is_typeArray_slow(), "cast to typeArrayKlass");
  86     return (typeArrayKlass*) k->klass_part(); 
  87   }
  88 
  89   // Naming
  90   static const char* external_name(BasicType type);
  91 
  92   // Sizing
  93   static int header_size()  { return oopDesc::header_size() + sizeof(typeArrayKlass)/HeapWordSize; }
  94   int object_size() const   { return arrayKlass::object_size(header_size()); }
  95 
  96   // Initialization (virtual from Klass)
  97   void initialize(TRAPS);
  98 
  99  private:
 100    // Helpers
 101    static klassOop array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS);
 102 
 103 #ifndef PRODUCT
 104  public:
 105   // Printing
 106   void oop_print_on(oop obj, outputStream* st);
 107 #endif
 108  public:
 109   const char* internal_name() const;
 110 };