rev 7183 : autospecialized oop_iterate using SFINAE and templates

   1 /*
   2  * Copyright (c) 1997, 2013, 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 "classfile/classLoaderData.hpp"
  29 #include "oops/arrayKlass.hpp"
  30 
  31 // A TypeArrayKlass is the klass of a typeArray
  32 // It contains the type and size of the elements
  33 
  34 class TypeArrayKlass : public ArrayKlass {
  35   friend class VMStructs;
  36  private:
  37   jint _max_length;            // maximum number of elements allowed in an array
  38 
  39   // Constructor
  40   TypeArrayKlass(BasicType type, Symbol* name);
  41   static TypeArrayKlass* allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS);
  42  public:
  43   TypeArrayKlass() {} // For dummy objects.
  44 
  45   // instance variables
  46   jint max_length()                     { return _max_length; }
  47   void set_max_length(jint m)           { _max_length = m;    }
  48 
  49   // testers
  50   bool oop_is_typeArray_slow() const    { return true; }
  51 
  52   // klass allocation
  53   static TypeArrayKlass* create_klass(BasicType type, const char* name_str,
  54                                TRAPS);
  55   static inline Klass* create_klass(BasicType type, int scale, TRAPS) {
  56     TypeArrayKlass* tak = create_klass(type, external_name(type), CHECK_NULL);
  57     assert(scale == (1 << tak->log2_element_size()), "scale must check out");
  58     return tak;
  59   }
  60 
  61   int oop_size(oop obj) const;
  62 
  63   bool compute_is_subtype_of(Klass* k);
  64 
  65   // Allocation
  66   typeArrayOop allocate_common(int length, bool do_zero, TRAPS);
  67   typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, true, THREAD); }
  68   oop multi_allocate(int rank, jint* sizes, TRAPS);
  69 
  70   oop protection_domain() const { return NULL; }
  71 
  72   // Copying
  73   void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
  74 


  75   // Iteration
  76   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk);
  77   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr);
  78 
  79   // Garbage collection
  80   void oop_follow_contents(oop obj);
  81   int  oop_adjust_pointers(oop obj);
  82 
  83   // Parallel Scavenge and Parallel Old
  84   PARALLEL_GC_DECLS
  85 
  86  protected:
  87   // Find n'th dimensional array
  88   virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
  89 
  90   // Returns the array class with this class as element type
  91   virtual Klass* array_klass_impl(bool or_null, TRAPS);
  92 
  93  public:
  94   // Casting from Klass*
  95   static TypeArrayKlass* cast(Klass* k) {
  96     assert(k->oop_is_typeArray(), "cast to TypeArrayKlass");
  97     return (TypeArrayKlass*) k;
  98   }
  99 
 100   // Naming
 101   static const char* external_name(BasicType type);
 102 
 103   // Sizing
 104   static int header_size()  { return sizeof(TypeArrayKlass)/HeapWordSize; }
 105   int size() const          { return ArrayKlass::static_size(header_size()); }
 106 
 107   // Initialization (virtual from Klass)
 108   void initialize(TRAPS);
 109 
 110  public:
 111   // Printing
 112 #ifndef PRODUCT
 113   void oop_print_on(oop obj, outputStream* st);
 114 #endif
 115 
 116   void print_on(outputStream* st) const;
 117   void print_value_on(outputStream* st) const;
 118 
 119  public:
 120   const char* internal_name() const;
 121 };
 122 
 123 #endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
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