1 /*

     2  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any 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, TRAPS);

    43 

    44   int oop_size(oop obj) const;

    45   int klass_oop_size() const  { return object_size(); }

    46 

    47   bool compute_is_subtype_of(klassOop k);

    48 

    49   // Allocation

    50   typeArrayOop allocate(int length, TRAPS);

    51   typeArrayOop allocate_permanent(int length, TRAPS);  // used for class file structures

    52   oop multi_allocate(int rank, jint* sizes, TRAPS);

    53 

    54   // Copying

    55   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);

    56 

    57   // Iteration

    58   int oop_oop_iterate(oop obj, OopClosure* blk);

    59   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);

    60 

    61   // Garbage collection

    62   void oop_follow_contents(oop obj);

    63   int  oop_adjust_pointers(oop obj);

    64 

    65   // Parallel Scavenge and Parallel Old

    66   PARALLEL_GC_DECLS

    67 

    68  protected:

    69   // Find n'th dimensional array

    70   virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);

    71 

    72   // Returns the array class with this class as element type

    73   virtual klassOop array_klass_impl(bool or_null, TRAPS);

    74 

    75  public:

    76   // Casting from klassOop

    77   static typeArrayKlass* cast(klassOop k) {

    78     assert(k->klass_part()->oop_is_typeArray_slow(), "cast to typeArrayKlass");

    79     return (typeArrayKlass*) k->klass_part();

    80   }

    81 

    82   // Naming

    83   static const char* external_name(BasicType type);

    84 

    85   // Sizing

    86   static int header_size()  { return oopDesc::header_size() + sizeof(typeArrayKlass)/HeapWordSize; }

    87   int object_size() const   { return arrayKlass::object_size(header_size()); }

    88 

    89   // Initialization (virtual from Klass)

    90   void initialize(TRAPS);

    91 

    92  private:

    93    // Helpers

    94    static klassOop array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS);

    95 

    96 #ifndef PRODUCT

    97  public:

    98   // Printing

    99   void oop_print_on(oop obj, outputStream* st);

   100 #endif

   101  public:

   102   const char* internal_name() const;

   103 };