arrayKlass.hpp revision 1879:f95d63e2154a 
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24
25#ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP
26#define SHARE_VM_OOPS_ARRAYKLASS_HPP
27
28#include "memory/universe.hpp"
29#include "oops/klass.hpp"
30#include "oops/klassOop.hpp"
31#include "oops/klassVtable.hpp"
32
33// arrayKlass is the abstract baseclass for all array classes
34
35class arrayKlass: public Klass {
36  friend class VMStructs;
37 private:
38  int      _dimension;         // This is n'th-dimensional array.
39  klassOop _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
40  klassOop _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
41  int      _vtable_len;        // size of vtable for this klass
42  juint    _alloc_size;        // allocation profiling support
43  oop      _component_mirror;  // component type, as a java/lang/Class
44
45 public:
46  // Testing operation
47  bool oop_is_array() const { return true; }
48
49  // Instance variables
50  int dimension() const                 { return _dimension;      }
51  void set_dimension(int dimension)     { _dimension = dimension; }
52
53  klassOop higher_dimension() const     { return _higher_dimension; }
54  void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); }
55  oop* adr_higher_dimension()           { return (oop*)&this->_higher_dimension;}
56
57  klassOop lower_dimension() const      { return _lower_dimension; }
58  void set_lower_dimension(klassOop k)  { oop_store_without_check((oop*) &_lower_dimension, (oop) k); }
59  oop* adr_lower_dimension()            { return (oop*)&this->_lower_dimension;}
60
61  // Allocation profiling support
62  juint alloc_size() const              { return _alloc_size; }
63  void set_alloc_size(juint n)          { _alloc_size = n; }
64
65  // offset of first element, including any padding for the sake of alignment
66  int  array_header_in_bytes() const    { return layout_helper_header_size(layout_helper()); }
67  int  log2_element_size() const        { return layout_helper_log2_element_size(layout_helper()); }
68  // type of elements (T_OBJECT for both oop arrays and array-arrays)
69  BasicType element_type() const        { return layout_helper_element_type(layout_helper()); }
70
71  oop  component_mirror() const         { return _component_mirror; }
72  void set_component_mirror(oop m)      { oop_store((oop*) &_component_mirror, m); }
73  oop* adr_component_mirror()           { return (oop*)&this->_component_mirror;}
74
75  // Compiler/Interpreter offset
76  static ByteSize component_mirror_offset() { return byte_offset_of(arrayKlass, _component_mirror); }
77
78  virtual klassOop java_super() const;//{ return SystemDictionary::Object_klass(); }
79
80  // Allocation
81  // Sizes points to the first dimension of the array, subsequent dimensions
82  // are always in higher memory.  The callers of these set that up.
83  virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
84  objArrayOop allocate_arrayArray(int n, int length, TRAPS);
85
86  // Lookup operations
87  methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
88
89  // Casting from klassOop
90  static arrayKlass* cast(klassOop k) {
91    Klass* kp = k->klass_part();
92    assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass");
93    return (arrayKlass*) kp;
94  }
95
96  objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
97  bool compute_is_subtype_of(klassOop k);
98
99  // Sizing
100  static int header_size()                 { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; }
101  int object_size(int header_size) const;
102
103  bool object_is_parsable() const          { return _vtable_len > 0; }
104
105  // Java vtable
106  klassVtable* vtable() const;             // return new klassVtable
107  int  vtable_length() const               { return _vtable_len; }
108  static int base_vtable_length()          { return Universe::base_vtable_size(); }
109  void set_vtable_length(int len)          { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
110 protected:
111  inline intptr_t* start_of_vtable() const;
112
113 public:
114  // Iterators
115  void array_klasses_do(void f(klassOop k));
116  void with_array_klasses_do(void f(klassOop k));
117
118  // Shared creation method
119  static arrayKlassHandle base_create_array_klass(
120                                          const Klass_vtbl& vtbl,
121                                          int header_size, KlassHandle klass,
122                                          TRAPS);
123  // Return a handle.
124  static void     complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS);
125
126  // jvm support
127  jint compute_modifier_flags(TRAPS) const;
128
129  // JVMTI support
130  jint jvmti_class_status() const;
131
132  // Printing
133  void oop_print_on(oop obj, outputStream* st);
134
135  // Verification
136  void oop_verify_on(oop obj, outputStream* st);
137};
138
139#endif // SHARE_VM_OOPS_ARRAYKLASS_HPP
140