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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // arrayKlass is the abstract baseclass for all array classes
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26
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27 class arrayKlass: public Klass {
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28 friend class VMStructs;
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29 private:
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30 int _dimension; // This is n'th-dimensional array.
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31 klassOop _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
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32 klassOop _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
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33 int _vtable_len; // size of vtable for this klass
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34 juint _alloc_size; // allocation profiling support
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35 oop _component_mirror; // component type, as a java/lang/Class
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36
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37 public:
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38 // Testing operation
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39 bool oop_is_array() const { return true; }
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40
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41 // Instance variables
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42 int dimension() const { return _dimension; }
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43 void set_dimension(int dimension) { _dimension = dimension; }
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44
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45 klassOop higher_dimension() const { return _higher_dimension; }
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46 void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); }
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47 oop* adr_higher_dimension() { return (oop*)&this->_higher_dimension;}
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48
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49 klassOop lower_dimension() const { return _lower_dimension; }
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50 void set_lower_dimension(klassOop k) { oop_store_without_check((oop*) &_lower_dimension, (oop) k); }
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51 oop* adr_lower_dimension() { return (oop*)&this->_lower_dimension;}
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52
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53 // Allocation profiling support
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54 juint alloc_size() const { return _alloc_size; }
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55 void set_alloc_size(juint n) { _alloc_size = n; }
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56
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57 // offset of first element, including any padding for the sake of alignment
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58 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
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59 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
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60 // type of elements (T_OBJECT for both oop arrays and array-arrays)
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61 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
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62
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63 oop component_mirror() const { return _component_mirror; }
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64 void set_component_mirror(oop m) { oop_store((oop*) &_component_mirror, m); }
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65 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;}
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66
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67 // Compiler/Interpreter offset
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68 static ByteSize component_mirror_offset() { return byte_offset_of(arrayKlass, _component_mirror); }
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69
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70 virtual klassOop java_super() const;//{ return SystemDictionary::object_klass(); }
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71
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72 // Allocation
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73 // Sizes points to the first dimension of the array, subsequent dimensions
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74 // are always in higher memory. The callers of these set that up.
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75 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
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76 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
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77
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78 // Lookup operations
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79 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
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80
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81 // Casting from klassOop
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82 static arrayKlass* cast(klassOop k) {
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83 Klass* kp = k->klass_part();
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84 assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass");
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85 return (arrayKlass*) kp;
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86 }
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87
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88 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
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89 bool compute_is_subtype_of(klassOop k);
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90
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91 // Sizing
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92 static int header_size() { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; }
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93 int object_size(int header_size) const;
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94
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95 bool object_is_parsable() const { return _vtable_len > 0; }
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96
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97 // Java vtable
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98 klassVtable* vtable() const; // return new klassVtable
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99 int vtable_length() const { return _vtable_len; }
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100 static int base_vtable_length() { return Universe::base_vtable_size(); }
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101 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
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102 protected:
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103 inline intptr_t* start_of_vtable() const;
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104
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105 public:
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106 // Iterators
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107 void array_klasses_do(void f(klassOop k));
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108 void with_array_klasses_do(void f(klassOop k));
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109
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110 // Shared creation method
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111 static arrayKlassHandle base_create_array_klass(
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112 const Klass_vtbl& vtbl,
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113 int header_size, KlassHandle klass,
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114 TRAPS);
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115 // Return a handle.
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116 static void complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS);
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117
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118 public:
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119 // jvm support
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120 jint compute_modifier_flags(TRAPS) const;
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121
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122 public:
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123 // JVMTI support
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124 jint jvmti_class_status() const;
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125
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126 #ifndef PRODUCT
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127 public:
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128 // Printing
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129 void oop_print_on(oop obj, outputStream* st);
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130 #endif
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131 public:
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132 // Verification
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133 void oop_verify_on(oop obj, outputStream* st);
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134 };
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