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annotate src/share/vm/oops/arrayKlass.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 069ab3f976d3
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