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annotate src/share/vm/oops/arrayKlass.hpp @ 6862:8a5ea0a9ccc4

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7127708: G1: change task num types from int to uint in concurrent mark Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich. Reviewed-by: johnc Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
author johnc
date Sat, 06 Oct 2012 01:17:44 -0700
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children d8ce2825b193
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP
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26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP
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27
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28 #include "memory/universe.hpp"
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29 #include "oops/klass.hpp"
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30
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31 class klassVtable;
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32
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33 // arrayKlass is the abstract baseclass for all array classes
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34
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35 class arrayKlass: public Klass {
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36 friend class VMStructs;
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37 private:
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38 int _dimension; // This is n'th-dimensional array.
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39 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
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40 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
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41 int _vtable_len; // size of vtable for this klass
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42 juint _alloc_size; // allocation profiling support
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43 oop _component_mirror; // component type, as a java/lang/Class
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44
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45 protected:
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46 // Constructors
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47 // The constructor with the Symbol argument does the real array
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48 // initialization, the other is a dummy
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49 arrayKlass(Symbol* name);
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50 arrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
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51
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52 public:
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53 // Testing operation
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54 bool oop_is_array_slow() const { return true; }
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55
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56 // Instance variables
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57 int dimension() const { return _dimension; }
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58 void set_dimension(int dimension) { _dimension = dimension; }
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59
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60 Klass* higher_dimension() const { return _higher_dimension; }
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61 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
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62 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;}
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63
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64 Klass* lower_dimension() const { return _lower_dimension; }
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65 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
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66 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;}
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67
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68 // Allocation profiling support
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69 juint alloc_size() const { return _alloc_size; }
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70 void set_alloc_size(juint n) { _alloc_size = n; }
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71
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72 // offset of first element, including any padding for the sake of alignment
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73 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
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74 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
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75 // type of elements (T_OBJECT for both oop arrays and array-arrays)
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76 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
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77
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78 oop component_mirror() const { return _component_mirror; }
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79 void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); }
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80 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;}
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81
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82 // Compiler/Interpreter offset
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83 static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(arrayKlass, _component_mirror)); }
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84
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85 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); }
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86
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87 // Allocation
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88 // Sizes points to the first dimension of the array, subsequent dimensions
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89 // are always in higher memory. The callers of these set that up.
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90 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
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91 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
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92
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93 // Lookup operations
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94 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
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95
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96 // Casting from Klass*
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97 static arrayKlass* cast(Klass* k) {
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98 assert(k->oop_is_array(), "cast to arrayKlass");
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99 return (arrayKlass*) k;
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100 }
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101
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102 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
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103 bool compute_is_subtype_of(Klass* k);
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104
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105 // Sizing
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106 static int header_size() { return sizeof(arrayKlass)/HeapWordSize; }
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107 static int static_size(int header_size);
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108
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109 // Java vtable
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110 klassVtable* vtable() const; // return new klassVtable
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111 int vtable_length() const { return _vtable_len; }
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112 static int base_vtable_length() { return Universe::base_vtable_size(); }
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113 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
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114 protected:
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115 inline intptr_t* start_of_vtable() const;
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116
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117 public:
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118 // Iterators
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119 void array_klasses_do(void f(Klass* k));
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120 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
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121 void with_array_klasses_do(void f(Klass* k));
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122
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123 // GC support
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124 virtual void oops_do(OopClosure* cl);
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125
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126 // Return a handle.
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127 static void complete_create_array_klass(arrayKlass* k, KlassHandle super_klass, TRAPS);
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128
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129
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130 // jvm support
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131 jint compute_modifier_flags(TRAPS) const;
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132
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133 // JVMTI support
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134 jint jvmti_class_status() const;
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135
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136 // CDS support - remove and restore oops from metadata. Oops are not shared.
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137 virtual void remove_unshareable_info();
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138 virtual void restore_unshareable_info(TRAPS);
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139
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140 // Printing
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141 void print_on(outputStream* st) const;
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142 void print_value_on(outputStream* st) const;
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143
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144 void oop_print_on(oop obj, outputStream* st);
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145
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146 // Verification
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147 void verify_on(outputStream* st);
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148
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149 void oop_verify_on(oop obj, outputStream* st);
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150 };
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151
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152 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP