annotate src/share/vm/oops/typeArrayKlass.cpp @ 6725:da91efe96a93

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 fc9d8850ab8b
children 86af3dacab81 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 #include "precompiled.hpp"
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26 #include "classfile/symbolTable.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.hpp"
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30 #include "gc_interface/collectedHeap.inline.hpp"
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31 #include "memory/metadataFactory.hpp"
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32 #include "memory/resourceArea.hpp"
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33 #include "memory/universe.hpp"
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34 #include "memory/universe.inline.hpp"
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35 #include "oops/instanceKlass.hpp"
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36 #include "oops/klass.inline.hpp"
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37 #include "oops/objArrayKlass.hpp"
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38 #include "oops/oop.inline.hpp"
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39 #include "oops/typeArrayKlass.hpp"
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40 #include "oops/typeArrayOop.hpp"
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41 #include "runtime/handles.inline.hpp"
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42
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43 bool typeArrayKlass::compute_is_subtype_of(Klass* k) {
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44 if (!k->oop_is_typeArray()) {
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45 return arrayKlass::compute_is_subtype_of(k);
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46 }
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47
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48 typeArrayKlass* tak = typeArrayKlass::cast(k);
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49 if (dimension() != tak->dimension()) return false;
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50
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51 return element_type() == tak->element_type();
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52 }
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53
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54 typeArrayKlass* typeArrayKlass::create_klass(BasicType type,
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55 const char* name_str, TRAPS) {
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56 Symbol* sym = NULL;
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57 if (name_str != NULL) {
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58 sym = SymbolTable::new_permanent_symbol(name_str, CHECK_NULL);
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59 }
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60
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61 ClassLoaderData* null_loader_data = ClassLoaderData::the_null_class_loader_data();
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62
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63 typeArrayKlass* ak = typeArrayKlass::allocate(null_loader_data, type, sym, CHECK_NULL);
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64
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65 // Add all classes to our internal class loader list here,
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66 // including classes in the bootstrap (NULL) class loader.
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67 // GC walks these as strong roots.
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68 null_loader_data->add_class(ak);
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70 // Call complete_create_array_klass after all instance variables have been initialized.
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71 complete_create_array_klass(ak, ak->super(), CHECK_NULL);
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72
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73 return ak;
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74 }
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75
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76 typeArrayKlass* typeArrayKlass::allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS) {
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77 assert(typeArrayKlass::header_size() <= InstanceKlass::header_size(),
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78 "array klasses must be same size as InstanceKlass");
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79
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80 int size = arrayKlass::static_size(typeArrayKlass::header_size());
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81
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82 return new (loader_data, size, THREAD) typeArrayKlass(type, name);
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83 }
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84
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85 typeArrayKlass::typeArrayKlass(BasicType type, Symbol* name) : arrayKlass(name) {
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86 set_layout_helper(array_layout_helper(type));
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87 assert(oop_is_array(), "sanity");
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88 assert(oop_is_typeArray(), "sanity");
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89
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90 set_max_length(arrayOopDesc::max_array_length(type));
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91 assert(size() >= typeArrayKlass::header_size(), "bad size");
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92
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93 set_class_loader_data(ClassLoaderData::the_null_class_loader_data());
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94 }
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95
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96 typeArrayOop typeArrayKlass::allocate_common(int length, bool do_zero, TRAPS) {
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97 assert(log2_element_size() >= 0, "bad scale");
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98 if (length >= 0) {
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99 if (length <= max_length()) {
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100 size_t size = typeArrayOopDesc::object_size(layout_helper(), length);
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101 KlassHandle h_k(THREAD, this);
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102 typeArrayOop t;
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103 CollectedHeap* ch = Universe::heap();
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104 if (do_zero) {
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105 t = (typeArrayOop)CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL);
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106 } else {
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107 t = (typeArrayOop)CollectedHeap::array_allocate_nozero(h_k, (int)size, length, CHECK_NULL);
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108 }
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109 return t;
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110 } else {
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111 report_java_out_of_memory("Requested array size exceeds VM limit");
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112 JvmtiExport::post_array_size_exhausted();
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113 THROW_OOP_0(Universe::out_of_memory_error_array_size());
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114 }
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115 } else {
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116 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
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117 }
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118 }
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119
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120 oop typeArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) {
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121 // For typeArrays this is only called for the last dimension
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122 assert(rank == 1, "just checking");
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123 int length = *last_size;
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124 return allocate(length, THREAD);
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125 }
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126
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127
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128 void typeArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
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129 assert(s->is_typeArray(), "must be type array");
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130
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131 // Check destination
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132 if (!d->is_typeArray() || element_type() != typeArrayKlass::cast(d->klass())->element_type()) {
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133 THROW(vmSymbols::java_lang_ArrayStoreException());
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134 }
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135
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136 // Check is all offsets and lengths are non negative
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137 if (src_pos < 0 || dst_pos < 0 || length < 0) {
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138 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
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139 }
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140 // Check if the ranges are valid
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141 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())
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142 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {
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143 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
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144 }
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145 // Check zero copy
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146 if (length == 0)
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147 return;
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148
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149 // This is an attempt to make the copy_array fast.
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150 int l2es = log2_element_size();
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151 int ihs = array_header_in_bytes() / wordSize;
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152 char* src = (char*) ((oop*)s + ihs) + ((size_t)src_pos << l2es);
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153 char* dst = (char*) ((oop*)d + ihs) + ((size_t)dst_pos << l2es);
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154 Copy::conjoint_memory_atomic(src, dst, (size_t)length << l2es);
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155 }
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156
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157
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158 // create a klass of array holding typeArrays
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159 Klass* typeArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) {
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160 int dim = dimension();
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161 assert(dim <= n, "check order of chain");
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162 if (dim == n)
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163 return this;
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164
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165 if (higher_dimension() == NULL) {
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166 if (or_null) return NULL;
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167
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168 ResourceMark rm;
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169 JavaThread *jt = (JavaThread *)THREAD;
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170 {
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171 MutexLocker mc(Compile_lock, THREAD); // for vtables
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172 // Atomic create higher dimension and link into list
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173 MutexLocker mu(MultiArray_lock, THREAD);
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174
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175 if (higher_dimension() == NULL) {
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176 Klass* oak = objArrayKlass::allocate_objArray_klass(
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177 class_loader_data(), dim + 1, this, CHECK_NULL);
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178 objArrayKlass* h_ak = objArrayKlass::cast(oak);
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179 h_ak->set_lower_dimension(this);
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180 OrderAccess::storestore();
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181 set_higher_dimension(h_ak);
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182 assert(h_ak->oop_is_objArray(), "incorrect initialization of objArrayKlass");
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183 }
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184 }
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185 } else {
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186 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
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187 }
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188 objArrayKlass* h_ak = objArrayKlass::cast(higher_dimension());
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189 if (or_null) {
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190 return h_ak->array_klass_or_null(n);
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191 }
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192 return h_ak->array_klass(n, CHECK_NULL);
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193 }
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194
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195 Klass* typeArrayKlass::array_klass_impl(bool or_null, TRAPS) {
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196 return array_klass_impl(or_null, dimension() + 1, THREAD);
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197 }
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198
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199 int typeArrayKlass::oop_size(oop obj) const {
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200 assert(obj->is_typeArray(),"must be a type array");
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201 typeArrayOop t = typeArrayOop(obj);
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202 return t->object_size();
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203 }
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204
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205 void typeArrayKlass::oop_follow_contents(oop obj) {
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206 assert(obj->is_typeArray(),"must be a type array");
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207 // Performance tweak: We skip iterating over the klass pointer since we
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208 // know that Universe::typeArrayKlass never moves.
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209 }
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210
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211 #ifndef SERIALGC
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212 void typeArrayKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) {
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213 assert(obj->is_typeArray(),"must be a type array");
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214 // Performance tweak: We skip iterating over the klass pointer since we
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215 // know that Universe::typeArrayKlass never moves.
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216 }
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217 #endif // SERIALGC
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218
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219 int typeArrayKlass::oop_adjust_pointers(oop obj) {
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220 assert(obj->is_typeArray(),"must be a type array");
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221 typeArrayOop t = typeArrayOop(obj);
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222 // Performance tweak: We skip iterating over the klass pointer since we
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223 // know that Universe::typeArrayKlass never moves.
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224 return t->object_size();
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225 }
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226
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227 int typeArrayKlass::oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
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228 assert(obj->is_typeArray(),"must be a type array");
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229 typeArrayOop t = typeArrayOop(obj);
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230 // Performance tweak: We skip iterating over the klass pointer since we
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231 // know that Universe::typeArrayKlass never moves.
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232 return t->object_size();
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233 }
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234
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235 int typeArrayKlass::oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
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236 assert(obj->is_typeArray(),"must be a type array");
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237 typeArrayOop t = typeArrayOop(obj);
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238 // Performance tweak: We skip iterating over the klass pointer since we
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239 // know that Universe::typeArrayKlass never moves.
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240 return t->object_size();
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241 }
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242
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243 #ifndef SERIALGC
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244 void typeArrayKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
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245 ShouldNotReachHere();
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246 assert(obj->is_typeArray(),"must be a type array");
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247 }
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248
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249 int
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250 typeArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
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251 assert(obj->is_typeArray(),"must be a type array");
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252 return typeArrayOop(obj)->object_size();
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253 }
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254 #endif // SERIALGC
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255
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256 void typeArrayKlass::initialize(TRAPS) {
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257 // Nothing to do. Having this function is handy since objArrayKlasses can be
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258 // initialized by calling initialize on their bottom_klass, see objArrayKlass::initialize
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259 }
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260
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261 const char* typeArrayKlass::external_name(BasicType type) {
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262 switch (type) {
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263 case T_BOOLEAN: return "[Z";
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264 case T_CHAR: return "[C";
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265 case T_FLOAT: return "[F";
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266 case T_DOUBLE: return "[D";
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267 case T_BYTE: return "[B";
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268 case T_SHORT: return "[S";
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269 case T_INT: return "[I";
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270 case T_LONG: return "[J";
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271 default: ShouldNotReachHere();
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272 }
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273 return NULL;
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274 }
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275
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276
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277 // Printing
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278
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279 void typeArrayKlass::print_on(outputStream* st) const {
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280 #ifndef PRODUCT
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281 assert(is_klass(), "must be klass");
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282 print_value_on(st);
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283 Klass::print_on(st);
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284 #endif //PRODUCT
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285 }
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286
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287 void typeArrayKlass::print_value_on(outputStream* st) const {
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288 assert(is_klass(), "must be klass");
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289 st->print("{type array ");
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290 switch (element_type()) {
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291 case T_BOOLEAN: st->print("bool"); break;
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292 case T_CHAR: st->print("char"); break;
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293 case T_FLOAT: st->print("float"); break;
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294 case T_DOUBLE: st->print("double"); break;
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295 case T_BYTE: st->print("byte"); break;
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296 case T_SHORT: st->print("short"); break;
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297 case T_INT: st->print("int"); break;
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298 case T_LONG: st->print("long"); break;
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299 default: ShouldNotReachHere();
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300 }
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301 st->print("}");
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302 }
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303
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304 #ifndef PRODUCT
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305
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306 static void print_boolean_array(typeArrayOop ta, int print_len, outputStream* st) {
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307 for (int index = 0; index < print_len; index++) {
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308 st->print_cr(" - %3d: %s", index, (ta->bool_at(index) == 0) ? "false" : "true");
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309 }
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310 }
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311
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312
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313 static void print_char_array(typeArrayOop ta, int print_len, outputStream* st) {
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314 for (int index = 0; index < print_len; index++) {
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315 jchar c = ta->char_at(index);
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316 st->print_cr(" - %3d: %x %c", index, c, isprint(c) ? c : ' ');
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317 }
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318 }
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319
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320
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321 static void print_float_array(typeArrayOop ta, int print_len, outputStream* st) {
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322 for (int index = 0; index < print_len; index++) {
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323 st->print_cr(" - %3d: %g", index, ta->float_at(index));
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324 }
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325 }
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326
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327
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328 static void print_double_array(typeArrayOop ta, int print_len, outputStream* st) {
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329 for (int index = 0; index < print_len; index++) {
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330 st->print_cr(" - %3d: %g", index, ta->double_at(index));
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331 }
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332 }
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333
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334
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335 static void print_byte_array(typeArrayOop ta, int print_len, outputStream* st) {
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336 for (int index = 0; index < print_len; index++) {
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337 jbyte c = ta->byte_at(index);
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338 st->print_cr(" - %3d: %x %c", index, c, isprint(c) ? c : ' ');
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339 }
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340 }
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341
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342
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343 static void print_short_array(typeArrayOop ta, int print_len, outputStream* st) {
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344 for (int index = 0; index < print_len; index++) {
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345 int v = ta->ushort_at(index);
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346 st->print_cr(" - %3d: 0x%x\t %d", index, v, v);
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347 }
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348 }
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349
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350
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351 static void print_int_array(typeArrayOop ta, int print_len, outputStream* st) {
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352 for (int index = 0; index < print_len; index++) {
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353 jint v = ta->int_at(index);
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354 st->print_cr(" - %3d: 0x%x %d", index, v, v);
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355 }
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356 }
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357
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358
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359 static void print_long_array(typeArrayOop ta, int print_len, outputStream* st) {
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360 for (int index = 0; index < print_len; index++) {
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361 jlong v = ta->long_at(index);
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362 st->print_cr(" - %3d: 0x%x 0x%x", index, high(v), low(v));
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363 }
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364 }
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365
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366
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367 void typeArrayKlass::oop_print_on(oop obj, outputStream* st) {
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368 arrayKlass::oop_print_on(obj, st);
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369 typeArrayOop ta = typeArrayOop(obj);
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370 int print_len = MIN2((intx) ta->length(), MaxElementPrintSize);
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371 switch (element_type()) {
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372 case T_BOOLEAN: print_boolean_array(ta, print_len, st); break;
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373 case T_CHAR: print_char_array(ta, print_len, st); break;
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374 case T_FLOAT: print_float_array(ta, print_len, st); break;
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375 case T_DOUBLE: print_double_array(ta, print_len, st); break;
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376 case T_BYTE: print_byte_array(ta, print_len, st); break;
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377 case T_SHORT: print_short_array(ta, print_len, st); break;
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378 case T_INT: print_int_array(ta, print_len, st); break;
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379 case T_LONG: print_long_array(ta, print_len, st); break;
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380 default: ShouldNotReachHere();
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381 }
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382 int remaining = ta->length() - print_len;
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383 if (remaining > 0) {
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384 tty->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining);
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385 }
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386 }
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387
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388 #endif // PRODUCT
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389
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390 const char* typeArrayKlass::internal_name() const {
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391 return Klass::external_name();
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392 }