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annotate src/share/vm/oops/arrayKlass.cpp @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
children 52b4284cb496
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1 /*
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Gilles Duboscq <duboscq@ssw.jku.at>
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2 * Copyright (c) 1997, 2013, 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 #include "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "classfile/systemDictionary.hpp"
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28 #include "classfile/vmSymbols.hpp"
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29 #include "gc_interface/collectedHeap.inline.hpp"
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30 #include "jvmtifiles/jvmti.h"
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31 #include "memory/gcLocker.hpp"
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32 #include "memory/universe.inline.hpp"
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33 #include "oops/arrayKlass.hpp"
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34 #include "oops/arrayOop.hpp"
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35 #include "oops/instanceKlass.hpp"
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36 #include "oops/objArrayOop.hpp"
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37 #include "oops/oop.inline.hpp"
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38
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39 int ArrayKlass::static_size(int header_size) {
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40 // size of an array klass object
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41 assert(header_size <= InstanceKlass::header_size(), "bad header size");
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42 // If this assert fails, see comments in base_create_array_klass.
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43 header_size = InstanceKlass::header_size();
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44 int vtable_len = Universe::base_vtable_size();
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45 #ifdef _LP64
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46 int size = header_size + align_object_offset(vtable_len);
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47 #else
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48 int size = header_size + vtable_len;
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49 #endif
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50 return align_object_size(size);
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51 }
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52
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53
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54 Klass* ArrayKlass::java_super() const {
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55 if (super() == NULL) return NULL; // bootstrap case
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56 // Array klasses have primary supertypes which are not reported to Java.
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57 // Example super chain: String[][] -> Object[][] -> Object[] -> Object
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58 return SystemDictionary::Object_klass();
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59 }
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60
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61
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62 oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
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63 ShouldNotReachHere();
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64 return NULL;
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65 }
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66
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67 Method* ArrayKlass::uncached_lookup_method(Symbol* name, Symbol* signature) const {
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68 // There are no methods in an array klass but the super class (Object) has some
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69 assert(super(), "super klass must be present");
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70 return super()->uncached_lookup_method(name, signature);
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71 }
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72
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73 ArrayKlass::ArrayKlass(Symbol* name) {
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74 set_name(name);
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75
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76 set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass());
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77 set_layout_helper(Klass::_lh_neutral_value);
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78 set_dimension(1);
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79 set_higher_dimension(NULL);
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80 set_lower_dimension(NULL);
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81 set_component_mirror(NULL);
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82 // Arrays don't add any new methods, so their vtable is the same size as
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83 // the vtable of klass Object.
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84 int vtable_size = Universe::base_vtable_size();
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85 set_vtable_length(vtable_size);
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86 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
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87 }
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88
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89
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90 // Initialization of vtables and mirror object is done separatly from base_create_array_klass,
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91 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
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92 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS) {
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93 ResourceMark rm(THREAD);
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94 k->initialize_supers(super_klass(), CHECK);
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95 k->vtable()->initialize_vtable(false, CHECK);
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96 java_lang_Class::create_mirror(k, Handle(NULL), CHECK);
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97 }
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98
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99 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots) {
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100 // interfaces = { cloneable_klass, serializable_klass };
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101 assert(num_extra_slots == 0, "sanity of primitive array type");
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102 // Must share this for correct bootstrapping!
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103 set_secondary_supers(Universe::the_array_interfaces_array());
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104 return NULL;
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105 }
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106
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107 bool ArrayKlass::compute_is_subtype_of(Klass* k) {
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108 // An array is a subtype of Serializable, Clonable, and Object
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109 return k == SystemDictionary::Object_klass()
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110 || k == SystemDictionary::Cloneable_klass()
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111 || k == SystemDictionary::Serializable_klass();
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112 }
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113
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114
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115 inline intptr_t* ArrayKlass::start_of_vtable() const {
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116 // all vtables start at the same place, that's why we use InstanceKlass::header_size here
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117 return ((intptr_t*)this) + InstanceKlass::header_size();
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118 }
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119
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120
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121 klassVtable* ArrayKlass::vtable() const {
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122 KlassHandle kh(Thread::current(), this);
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123 return new klassVtable(kh, start_of_vtable(), vtable_length() / vtableEntry::size());
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124 }
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125
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126
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127 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
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128 if (length < 0) {
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129 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
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130 }
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131 if (length > arrayOopDesc::max_array_length(T_ARRAY)) {
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132 report_java_out_of_memory("Requested array size exceeds VM limit");
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133 JvmtiExport::post_array_size_exhausted();
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134 THROW_OOP_0(Universe::out_of_memory_error_array_size());
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135 }
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136 int size = objArrayOopDesc::object_size(length);
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137 Klass* k = array_klass(n+dimension(), CHECK_0);
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138 ArrayKlass* ak = ArrayKlass::cast(k);
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139 objArrayOop o =
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140 (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0);
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141 // initialization to NULL not necessary, area already cleared
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142 return o;
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143 }
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144
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145 void ArrayKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
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146 Klass* k = this;
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147 // Iterate over this array klass and all higher dimensions
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148 while (k != NULL) {
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149 f(k, CHECK);
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150 k = ArrayKlass::cast(k)->higher_dimension();
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151 }
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152 }
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153
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154 void ArrayKlass::array_klasses_do(void f(Klass* k)) {
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155 Klass* k = this;
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156 // Iterate over this array klass and all higher dimensions
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157 while (k != NULL) {
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158 f(k);
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159 k = ArrayKlass::cast(k)->higher_dimension();
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160 }
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161 }
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162
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163 // GC support
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164
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165 void ArrayKlass::oops_do(OopClosure* cl) {
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166 Klass::oops_do(cl);
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167
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168 cl->do_oop(adr_component_mirror());
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169 }
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170
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171 // JVM support
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172
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173 jint ArrayKlass::compute_modifier_flags(TRAPS) const {
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174 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
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175 }
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176
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177 // JVMTI support
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178
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179 jint ArrayKlass::jvmti_class_status() const {
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180 return JVMTI_CLASS_STATUS_ARRAY;
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181 }
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182
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183 void ArrayKlass::remove_unshareable_info() {
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184 Klass::remove_unshareable_info();
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185 // Clear the java mirror
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186 set_component_mirror(NULL);
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187 }
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188
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189 void ArrayKlass::restore_unshareable_info(TRAPS) {
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190 Klass::restore_unshareable_info(CHECK);
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191 // Klass recreates the component mirror also
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192 }
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193
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194 // Printing
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195
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196 void ArrayKlass::print_on(outputStream* st) const {
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197 assert(is_klass(), "must be klass");
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198 Klass::print_on(st);
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199 }
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200
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201 void ArrayKlass::print_value_on(outputStream* st) const {
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202 assert(is_klass(), "must be klass");
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203 for(int index = 0; index < dimension(); index++) {
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204 st->print("[]");
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205 }
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206 }
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207
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208 void ArrayKlass::oop_print_on(oop obj, outputStream* st) {
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209 assert(obj->is_array(), "must be array");
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210 Klass::oop_print_on(obj, st);
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211 st->print_cr(" - length: %d", arrayOop(obj)->length());
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212 }
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213
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214
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215 // Verification
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216
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217 void ArrayKlass::verify_on(outputStream* st, bool check_dictionary) {
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218 Klass::verify_on(st, check_dictionary);
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219
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220 if (component_mirror() != NULL) {
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221 guarantee(component_mirror()->klass() != NULL, "should have a class");
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222 }
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223 }
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224
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225 void ArrayKlass::oop_verify_on(oop obj, outputStream* st) {
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226 guarantee(obj->is_array(), "must be array");
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227 arrayOop a = arrayOop(obj);
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228 guarantee(a->length() >= 0, "array with negative length?");
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229 }