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annotate src/share/vm/oops/arrayKlass.hpp @ 20465:7301840ea20e

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8023461: Thread holding lock at safepoint that vm can block on: MethodCompileQueue_lock Reviewed-by: kvn, iveresov
author vlivanov
date Tue, 11 Mar 2014 15:06:34 +0400
parents 6e0cb14ce59b
children 8cb56c8cb30d
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1 /*
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2 * Copyright (c) 1997, 2014, 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 oop _component_mirror; // component type, as a java/lang/Class
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43
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44 protected:
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45 // Constructors
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46 // The constructor with the Symbol argument does the real array
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47 // initialization, the other is a dummy
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48 ArrayKlass(Symbol* name);
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49 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
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50
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51 public:
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52 // Testing operation
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53 bool oop_is_array_slow() const { return true; }
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54
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55 // Instance variables
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56 int dimension() const { return _dimension; }
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57 void set_dimension(int dimension) { _dimension = dimension; }
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58
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59 Klass* higher_dimension() const { return _higher_dimension; }
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60 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
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61 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;}
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62
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63 Klass* lower_dimension() const { return _lower_dimension; }
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64 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
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65 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;}
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66
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67 // offset of first element, including any padding for the sake of alignment
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68 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
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69 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
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70 // type of elements (T_OBJECT for both oop arrays and array-arrays)
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71 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
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72
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73 oop component_mirror() const { return _component_mirror; }
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74 void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); }
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75 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;}
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76
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77 // Compiler/Interpreter offset
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78 static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); }
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79
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80 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); }
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81
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82 // Allocation
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83 // Sizes points to the first dimension of the array, subsequent dimensions
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84 // are always in higher memory. The callers of these set that up.
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85 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
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86 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
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87
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88 // Lookup operations
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89 Method* uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const;
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90
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91 // Casting from Klass*
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92 static ArrayKlass* cast(Klass* k) {
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93 assert(k->oop_is_array(), "cast to ArrayKlass");
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94 return (ArrayKlass*) k;
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95 }
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96
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97 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
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98 bool compute_is_subtype_of(Klass* k);
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99
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100 // Sizing
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101 static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; }
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102 static int static_size(int header_size);
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103
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104 #if INCLUDE_SERVICES
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105 virtual void collect_statistics(KlassSizeStats *sz) const {
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106 Klass::collect_statistics(sz);
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107 // Do nothing for now, but remember to modify if you add new
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108 // stuff to ArrayKlass.
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109 }
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110 #endif
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111
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112 // Java vtable
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113 klassVtable* vtable() const; // return new klassVtable
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114 int vtable_length() const { return _vtable_len; }
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115 static int base_vtable_length() { return Universe::base_vtable_size(); }
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116 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
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117 protected:
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118 inline intptr_t* start_of_vtable() const;
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119
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120 public:
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121 // Iterators
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122 void array_klasses_do(void f(Klass* k));
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123 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
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124
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125 // GC support
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126 virtual void oops_do(OopClosure* cl);
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127
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128 // Return a handle.
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129 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS);
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130
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131
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132 // jvm support
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133 jint compute_modifier_flags(TRAPS) const;
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134
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135 // JVMTI support
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136 jint jvmti_class_status() const;
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137
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138 // CDS support - remove and restore oops from metadata. Oops are not shared.
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139 virtual void remove_unshareable_info();
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140 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
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141
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142 // Printing
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143 void print_on(outputStream* st) const;
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144 void print_value_on(outputStream* st) const;
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145
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146 void oop_print_on(oop obj, outputStream* st);
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147
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148 // Verification
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149 void verify_on(outputStream* st);
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150
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151 void oop_verify_on(oop obj, outputStream* st);
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152 };
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153
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154 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP