Mercurial > hg > truffle
annotate src/share/vm/memory/metaspaceShared.cpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | 63a4eb8bcd23 |
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1 /* |
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2 * Copyright (c) 2012, 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/dictionary.hpp" |
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27 #include "classfile/loaderConstraints.hpp" |
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28 #include "classfile/placeholders.hpp" |
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29 #include "classfile/symbolTable.hpp" |
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30 #include "classfile/systemDictionary.hpp" |
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31 #include "code/codeCache.hpp" |
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32 #include "memory/filemap.hpp" |
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33 #include "memory/gcLocker.hpp" |
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34 #include "memory/metaspace.hpp" |
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35 #include "memory/metaspaceShared.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 #include "runtime/signature.hpp" |
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39 #include "runtime/vm_operations.hpp" |
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40 #include "runtime/vmThread.hpp" |
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41 #include "utilities/hashtable.inline.hpp" |
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42 |
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43 |
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44 int MetaspaceShared::_max_alignment = 0; |
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45 |
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46 ReservedSpace* MetaspaceShared::_shared_rs = NULL; |
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47 |
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48 // Read/write a data stream for restoring/preserving metadata pointers and |
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49 // miscellaneous data from/to the shared archive file. |
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50 |
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51 void MetaspaceShared::serialize(SerializeClosure* soc) { |
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52 int tag = 0; |
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53 soc->do_tag(--tag); |
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54 |
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55 // Verify the sizes of various metadata in the system. |
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56 soc->do_tag(sizeof(Method)); |
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57 soc->do_tag(sizeof(ConstMethod)); |
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58 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); |
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59 soc->do_tag(sizeof(ConstantPool)); |
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60 soc->do_tag(sizeof(ConstantPoolCache)); |
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61 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); |
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62 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); |
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63 soc->do_tag(sizeof(Symbol)); |
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64 |
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65 // Dump/restore miscellaneous metadata. |
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66 Universe::serialize(soc, true); |
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67 soc->do_tag(--tag); |
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68 |
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69 // Dump/restore references to commonly used names and signatures. |
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70 vmSymbols::serialize(soc); |
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71 soc->do_tag(--tag); |
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72 |
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73 soc->do_tag(666); |
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74 } |
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75 |
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76 |
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77 // CDS code for dumping shared archive. |
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78 |
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79 // Global object for holding classes that have been loaded. Since this |
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80 // is run at a safepoint just before exit, this is the entire set of classes. |
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81 static GrowableArray<Klass*>* _global_klass_objects; |
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82 static void collect_classes(Klass* k) { |
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83 _global_klass_objects->append_if_missing(k); |
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84 if (k->oop_is_instance()) { |
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85 // Add in the array classes too |
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86 InstanceKlass* ik = InstanceKlass::cast(k); |
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87 ik->array_klasses_do(collect_classes); |
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88 } |
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89 } |
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90 |
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91 static void remove_unshareable_in_classes() { |
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92 for (int i = 0; i < _global_klass_objects->length(); i++) { |
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93 Klass* k = _global_klass_objects->at(i); |
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94 k->remove_unshareable_info(); |
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95 } |
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96 } |
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97 |
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98 // Walk all methods in the class list and assign a fingerprint. |
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99 // so that this part of the ConstMethod* is read only. |
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100 static void calculate_fingerprints() { |
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101 for (int i = 0; i < _global_klass_objects->length(); i++) { |
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102 Klass* k = _global_klass_objects->at(i); |
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103 if (k->oop_is_instance()) { |
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104 InstanceKlass* ik = InstanceKlass::cast(k); |
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105 for (int i = 0; i < ik->methods()->length(); i++) { |
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106 Method* m = ik->methods()->at(i); |
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107 Fingerprinter fp(m); |
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108 // The side effect of this call sets method's fingerprint field. |
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109 fp.fingerprint(); |
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110 } |
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111 } |
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112 } |
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113 } |
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114 |
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115 // Patch C++ vtable pointer in metadata. |
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116 |
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117 // Klass and other metadata objects contain references to c++ vtables in the |
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118 // JVM library. |
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119 // Fix them to point to our constructed vtables. However, don't iterate |
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120 // across the space while doing this, as that causes the vtables to be |
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121 // patched, undoing our useful work. Instead, iterate to make a list, |
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122 // then use the list to do the fixing. |
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123 // |
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124 // Our constructed vtables: |
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125 // Dump time: |
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126 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs |
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127 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list |
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128 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and |
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129 // associated metadata to point to jump table rather than to current vtbl |
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130 // Table layout: NOTE FIXED SIZE |
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131 // 1. vtbl pointers |
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132 // 2. #Klass X #virtual methods per Klass |
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133 // 1 entry for each, in the order: |
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134 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry |
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135 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry |
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136 // ... |
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137 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry, |
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138 // ... Klass<vtbl_list_size>:method<num_virtuals> entry |
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139 // Sample entry: (Sparc): |
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140 // save(sp, -256, sp) |
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141 // ba,pt common_code |
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142 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255) |
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143 // |
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144 // Restore time: |
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145 // 1. initialize_shared_space: reserve space for table |
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146 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text |
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147 // |
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148 // Execution time: |
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149 // First virtual method call for any object of these metadata types: |
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150 // 1. object->klass |
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151 // 2. vtable entry for that klass points to the jump table entries |
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152 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index |
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153 // 4. common_code: |
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154 // Get address of new vtbl pointer for this Klass from updated table |
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155 // Update new vtbl pointer in the Klass: future virtual calls go direct |
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156 // Jump to method, using new vtbl pointer and method index |
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157 |
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158 |
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159 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) { |
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160 void* old_vtbl_ptr = *(void**)obj; |
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161 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) { |
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162 if (vtbl_list[i] == old_vtbl_ptr) { |
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163 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals; |
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164 } |
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165 } |
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166 ShouldNotReachHere(); |
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167 return NULL; |
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168 } |
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169 |
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170 // Assumes the vtable is in first slot in object. |
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171 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) { |
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172 int n = _global_klass_objects->length(); |
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173 for (int i = 0; i < n; i++) { |
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174 Klass* obj = _global_klass_objects->at(i); |
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175 // Note oop_is_instance() is a virtual call. After patching vtables |
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176 // all virtual calls on the dummy vtables will restore the original! |
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177 if (obj->oop_is_instance()) { |
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178 InstanceKlass* ik = InstanceKlass::cast(obj); |
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179 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik); |
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180 ConstantPool* cp = ik->constants(); |
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181 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp); |
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182 for (int j = 0; j < ik->methods()->length(); j++) { |
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183 Method* m = ik->methods()->at(j); |
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184 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m); |
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185 } |
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186 } else { |
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187 // Array klasses |
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188 Klass* k = obj; |
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189 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k); |
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190 } |
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191 } |
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192 } |
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193 |
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194 // Closure for serializing initialization data out to a data area to be |
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195 // written to the shared file. |
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196 |
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197 class WriteClosure : public SerializeClosure { |
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198 private: |
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199 intptr_t* top; |
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200 char* end; |
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201 |
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202 inline void check_space() { |
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203 if ((char*)top + sizeof(intptr_t) > end) { |
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204 report_out_of_shared_space(SharedMiscData); |
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205 } |
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206 } |
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207 |
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208 public: |
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209 WriteClosure(char* md_top, char* md_end) { |
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210 top = (intptr_t*)md_top; |
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211 end = md_end; |
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212 } |
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213 |
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214 char* get_top() { return (char*)top; } |
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215 |
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216 void do_ptr(void** p) { |
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217 check_space(); |
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218 *top = (intptr_t)*p; |
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219 ++top; |
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220 } |
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221 |
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222 void do_tag(int tag) { |
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223 check_space(); |
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224 *top = (intptr_t)tag; |
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225 ++top; |
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226 } |
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227 |
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228 void do_region(u_char* start, size_t size) { |
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229 if ((char*)top + size > end) { |
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230 report_out_of_shared_space(SharedMiscData); |
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231 } |
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232 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); |
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233 assert(size % sizeof(intptr_t) == 0, "bad size"); |
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234 do_tag((int)size); |
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235 while (size > 0) { |
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236 *top = *(intptr_t*)start; |
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237 ++top; |
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238 start += sizeof(intptr_t); |
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239 size -= sizeof(intptr_t); |
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240 } |
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241 } |
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242 |
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243 bool reading() const { return false; } |
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244 }; |
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245 |
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246 // This is for dumping detailed statistics for the allocations |
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247 // in the shared spaces. |
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248 class DumpAllocClosure : public Metaspace::AllocRecordClosure { |
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249 public: |
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250 |
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251 // Here's poor man's enum inheritance |
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252 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ |
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253 METASPACE_OBJ_TYPES_DO(f) \ |
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254 f(SymbolHashentry) \ |
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255 f(SymbolBuckets) \ |
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256 f(Other) |
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257 |
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258 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type, |
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259 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name; |
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260 |
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261 enum Type { |
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262 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc |
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263 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE) |
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264 _number_of_types |
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265 }; |
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266 |
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267 static const char * type_name(Type type) { |
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268 switch(type) { |
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269 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE) |
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270 default: |
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271 ShouldNotReachHere(); |
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272 return NULL; |
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273 } |
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274 } |
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275 |
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276 public: |
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277 enum { |
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278 RO = 0, |
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279 RW = 1 |
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280 }; |
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281 |
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282 int _counts[2][_number_of_types]; |
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283 int _bytes [2][_number_of_types]; |
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284 int _which; |
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285 |
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286 DumpAllocClosure() { |
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287 memset(_counts, 0, sizeof(_counts)); |
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288 memset(_bytes, 0, sizeof(_bytes)); |
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289 }; |
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290 |
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291 void iterate_metaspace(Metaspace* space, int which) { |
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292 assert(which == RO || which == RW, "sanity"); |
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293 _which = which; |
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294 space->iterate(this); |
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295 } |
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296 |
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297 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) { |
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298 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); |
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299 _counts[_which][type] ++; |
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300 _bytes [_which][type] += byte_size; |
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301 } |
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302 |
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303 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all); |
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304 }; |
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305 |
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306 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) { |
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307 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write |
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308 int other_bytes = md_all + mc_all; |
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309 |
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310 // Calculate size of data that was not allocated by Metaspace::allocate() |
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311 int symbol_count = _counts[RO][MetaspaceObj::SymbolType]; |
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312 int symhash_bytes = symbol_count * sizeof (HashtableEntry<Symbol*, mtSymbol>); |
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313 int symbuck_count = SymbolTable::the_table()->table_size(); |
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314 int symbuck_bytes = symbuck_count * sizeof(HashtableBucket<mtSymbol>); |
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315 |
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316 _counts[RW][SymbolHashentryType] = symbol_count; |
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317 _bytes [RW][SymbolHashentryType] = symhash_bytes; |
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318 other_bytes -= symhash_bytes; |
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319 |
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320 _counts[RW][SymbolBucketsType] = symbuck_count; |
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321 _bytes [RW][SymbolBucketsType] = symbuck_bytes; |
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322 other_bytes -= symbuck_bytes; |
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323 |
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324 // TODO: count things like dictionary, vtable, etc |
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325 _bytes[RW][OtherType] = other_bytes; |
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326 |
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327 // prevent divide-by-zero |
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328 if (ro_all < 1) { |
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329 ro_all = 1; |
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330 } |
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331 if (rw_all < 1) { |
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332 rw_all = 1; |
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333 } |
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334 |
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335 int all_ro_count = 0; |
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336 int all_ro_bytes = 0; |
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337 int all_rw_count = 0; |
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338 int all_rw_bytes = 0; |
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339 |
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340 const char *fmt = "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"; |
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341 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; |
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342 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; |
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343 |
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344 tty->print_cr("Detailed metadata info (rw includes md and mc):"); |
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345 tty->print_cr(hdr); |
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346 tty->print_cr(sep); |
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347 for (int type = 0; type < int(_number_of_types); type ++) { |
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348 const char *name = type_name((Type)type); |
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349 int ro_count = _counts[RO][type]; |
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350 int ro_bytes = _bytes [RO][type]; |
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351 int rw_count = _counts[RW][type]; |
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352 int rw_bytes = _bytes [RW][type]; |
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353 int count = ro_count + rw_count; |
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354 int bytes = ro_bytes + rw_bytes; |
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355 |
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356 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all); |
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357 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all); |
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358 double perc = 100.0 * double(bytes) / double(ro_all + rw_all); |
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359 |
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360 tty->print_cr(fmt, name, |
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361 ro_count, ro_bytes, ro_perc, |
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362 rw_count, rw_bytes, rw_perc, |
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363 count, bytes, perc); |
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364 |
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365 all_ro_count += ro_count; |
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366 all_ro_bytes += ro_bytes; |
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367 all_rw_count += rw_count; |
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368 all_rw_bytes += rw_bytes; |
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369 } |
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370 |
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371 int all_count = all_ro_count + all_rw_count; |
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372 int all_bytes = all_ro_bytes + all_rw_bytes; |
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373 |
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374 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all); |
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375 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all); |
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376 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all); |
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377 |
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378 tty->print_cr(sep); |
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379 tty->print_cr(fmt, "Total", |
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380 all_ro_count, all_ro_bytes, all_ro_perc, |
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381 all_rw_count, all_rw_bytes, all_rw_perc, |
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382 all_count, all_bytes, all_perc); |
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383 |
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384 assert(all_ro_bytes == ro_all, "everything should have been counted"); |
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385 assert(all_rw_bytes == rw_all, "everything should have been counted"); |
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386 } |
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387 |
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388 // Populate the shared space. |
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389 |
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390 class VM_PopulateDumpSharedSpace: public VM_Operation { |
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391 private: |
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392 ClassLoaderData* _loader_data; |
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393 GrowableArray<Klass*> *_class_promote_order; |
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394 VirtualSpace _md_vs; |
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395 VirtualSpace _mc_vs; |
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396 |
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397 public: |
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398 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data, |
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399 GrowableArray<Klass*> *class_promote_order) : |
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400 _loader_data(loader_data) { |
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401 |
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402 // Split up and initialize the misc code and data spaces |
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403 ReservedSpace* shared_rs = MetaspaceShared::shared_rs(); |
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404 int metadata_size = SharedReadOnlySize+SharedReadWriteSize; |
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405 ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size); |
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406 ReservedSpace misc_section = shared_rs->last_part(metadata_size); |
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407 |
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408 // Now split into misc sections. |
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409 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize); |
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410 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize); |
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411 _md_vs.initialize(md_rs, SharedMiscDataSize); |
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412 _mc_vs.initialize(mc_rs, SharedMiscCodeSize); |
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413 _class_promote_order = class_promote_order; |
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414 } |
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415 |
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416 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } |
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417 void doit(); // outline because gdb sucks |
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418 }; // class VM_PopulateDumpSharedSpace |
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419 |
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420 |
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421 void VM_PopulateDumpSharedSpace::doit() { |
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422 Thread* THREAD = VMThread::vm_thread(); |
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423 NOT_PRODUCT(SystemDictionary::verify();) |
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424 // The following guarantee is meant to ensure that no loader constraints |
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425 // exist yet, since the constraints table is not shared. This becomes |
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426 // more important now that we don't re-initialize vtables/itables for |
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427 // shared classes at runtime, where constraints were previously created. |
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428 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, |
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429 "loader constraints are not saved"); |
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430 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, |
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431 "placeholders are not saved"); |
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432 // Revisit and implement this if we prelink method handle call sites: |
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433 guarantee(SystemDictionary::invoke_method_table() == NULL || |
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434 SystemDictionary::invoke_method_table()->number_of_entries() == 0, |
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435 "invoke method table is not saved"); |
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436 |
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437 // At this point, many classes have been loaded. |
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438 // Gather systemDictionary classes in a global array and do everything to |
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439 // that so we don't have to walk the SystemDictionary again. |
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440 _global_klass_objects = new GrowableArray<Klass*>(1000); |
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441 Universe::basic_type_classes_do(collect_classes); |
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442 SystemDictionary::classes_do(collect_classes); |
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443 |
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444 tty->print_cr("Number of classes %d", _global_klass_objects->length()); |
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445 |
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446 // Update all the fingerprints in the shared methods. |
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447 tty->print("Calculating fingerprints ... "); |
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448 calculate_fingerprints(); |
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449 tty->print_cr("done. "); |
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450 |
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451 // Remove all references outside the metadata |
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452 tty->print("Removing unshareable information ... "); |
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453 remove_unshareable_in_classes(); |
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454 tty->print_cr("done. "); |
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455 |
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456 // Set up the share data and shared code segments. |
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457 char* md_low = _md_vs.low(); |
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458 char* md_top = md_low; |
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459 char* md_end = _md_vs.high(); |
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460 char* mc_low = _mc_vs.low(); |
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461 char* mc_top = mc_low; |
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462 char* mc_end = _mc_vs.high(); |
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463 |
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464 // Reserve space for the list of Klass*s whose vtables are used |
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465 // for patching others as needed. |
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466 |
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467 void** vtbl_list = (void**)md_top; |
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468 int vtbl_list_size = MetaspaceShared::vtbl_list_size; |
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469 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
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470 |
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471 md_top += vtbl_list_size * sizeof(void*); |
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472 void* vtable = md_top; |
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473 |
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474 // Reserve space for a new dummy vtable for klass objects in the |
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475 // heap. Generate self-patching vtable entries. |
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476 |
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477 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable, |
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478 &md_top, md_end, |
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479 &mc_top, mc_end); |
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480 |
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481 // Reorder the system dictionary. (Moving the symbols affects |
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482 // how the hash table indices are calculated.) |
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483 // Not doing this either. |
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484 |
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485 SystemDictionary::reorder_dictionary(); |
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486 |
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487 NOT_PRODUCT(SystemDictionary::verify();) |
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488 |
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489 // Copy the the symbol table, and the system dictionary to the shared |
14309 | 490 // space in usable form. Copy the hashtable |
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491 // buckets first [read-write], then copy the linked lists of entries |
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492 // [read-only]. |
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493 |
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494 SymbolTable::reverse(md_top); |
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495 NOT_PRODUCT(SymbolTable::verify()); |
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496 SymbolTable::copy_buckets(&md_top, md_end); |
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497 |
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498 SystemDictionary::reverse(); |
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499 SystemDictionary::copy_buckets(&md_top, md_end); |
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500 |
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501 ClassLoader::verify(); |
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502 ClassLoader::copy_package_info_buckets(&md_top, md_end); |
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503 ClassLoader::verify(); |
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504 |
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505 SymbolTable::copy_table(&md_top, md_end); |
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506 SystemDictionary::copy_table(&md_top, md_end); |
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507 ClassLoader::verify(); |
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508 ClassLoader::copy_package_info_table(&md_top, md_end); |
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509 ClassLoader::verify(); |
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510 |
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511 // Write the other data to the output array. |
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512 WriteClosure wc(md_top, md_end); |
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513 MetaspaceShared::serialize(&wc); |
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514 md_top = wc.get_top(); |
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515 |
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516 // Print shared spaces all the time |
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517 const char* fmt = "%s space: %9d [ %4.1f%% of total] out of %9d bytes [%4.1f%% used] at " PTR_FORMAT; |
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518 Metaspace* ro_space = _loader_data->ro_metaspace(); |
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519 Metaspace* rw_space = _loader_data->rw_metaspace(); |
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520 |
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521 // Allocated size of each space (may not be all occupied) |
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522 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType); |
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523 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType); |
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524 const size_t md_alloced = md_end-md_low; |
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525 const size_t mc_alloced = mc_end-mc_low; |
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526 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced; |
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527 |
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528 // Occupied size of each space. |
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529 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType); |
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530 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType); |
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531 const size_t md_bytes = size_t(md_top - md_low); |
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532 const size_t mc_bytes = size_t(mc_top - mc_low); |
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533 |
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534 // Percent of total size |
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535 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes; |
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536 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0; |
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537 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0; |
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538 const double md_t_perc = md_bytes / double(total_bytes) * 100.0; |
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539 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0; |
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540 |
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541 // Percent of fullness of each space |
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542 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0; |
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543 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0; |
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544 const double md_u_perc = md_bytes / double(md_alloced) * 100.0; |
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545 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0; |
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546 const double total_u_perc = total_bytes / double(total_alloced) * 100.0; |
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547 |
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548 tty->print_cr(fmt, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, ro_space->bottom()); |
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549 tty->print_cr(fmt, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, rw_space->bottom()); |
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550 tty->print_cr(fmt, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, md_low); |
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551 tty->print_cr(fmt, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, mc_low); |
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552 tty->print_cr("total : %9d [100.0%% of total] out of %9d bytes [%4.1f%% used]", |
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553 total_bytes, total_alloced, total_u_perc); |
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554 |
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555 // Update the vtable pointers in all of the Klass objects in the |
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556 // heap. They should point to newly generated vtable. |
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557 patch_klass_vtables(vtbl_list, vtable); |
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558 |
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559 // dunno what this is for. |
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560 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass); |
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561 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*)); |
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562 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*)); |
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563 |
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564 // Create and write the archive file that maps the shared spaces. |
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565 |
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566 FileMapInfo* mapinfo = new FileMapInfo(); |
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567 mapinfo->populate_header(MetaspaceShared::max_alignment()); |
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568 |
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569 // Pass 1 - update file offsets in header. |
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570 mapinfo->write_header(); |
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571 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
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572 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
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573 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
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574 pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
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575 SharedMiscDataSize, |
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576 false, false); |
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577 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
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578 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
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579 SharedMiscCodeSize, |
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580 true, true); |
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581 |
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582 // Pass 2 - write data. |
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583 mapinfo->open_for_write(); |
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584 mapinfo->write_header(); |
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585 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
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586 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
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587 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
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588 pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
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589 SharedMiscDataSize, |
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590 false, false); |
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591 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
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592 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
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593 SharedMiscCodeSize, |
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594 true, true); |
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595 mapinfo->close(); |
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596 |
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597 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*)); |
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598 |
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599 if (PrintSharedSpaces) { |
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600 DumpAllocClosure dac; |
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601 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO); |
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602 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW); |
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603 |
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604 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes)); |
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605 } |
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606 } |
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607 |
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608 static void link_shared_classes(Klass* obj, TRAPS) { |
6983 | 609 Klass* k = obj; |
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610 if (k->oop_is_instance()) { |
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611 InstanceKlass* ik = (InstanceKlass*) k; |
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612 // Link the class to cause the bytecodes to be rewritten and the |
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613 // cpcache to be created. |
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614 if (ik->init_state() < InstanceKlass::linked) { |
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615 ik->link_class(THREAD); |
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616 guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting"); |
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617 } |
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618 } |
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619 } |
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620 |
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621 |
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622 // Support for a simple checksum of the contents of the class list |
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623 // file to prevent trivial tampering. The algorithm matches that in |
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624 // the MakeClassList program used by the J2SE build process. |
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625 #define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe)) |
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626 static jlong |
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627 jsum(jlong start, const char *buf, const int len) |
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628 { |
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629 jlong h = start; |
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630 char *p = (char *)buf, *e = p + len; |
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631 while (p < e) { |
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632 char c = *p++; |
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633 if (c <= ' ') { |
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634 /* Skip spaces and control characters */ |
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635 continue; |
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636 } |
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637 h = 31 * h + c; |
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638 } |
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639 return h; |
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640 } |
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641 |
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642 // Preload classes from a list, populate the shared spaces and dump to a |
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643 // file. |
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644 void MetaspaceShared::preload_and_dump(TRAPS) { |
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645 TraceTime timer("Dump Shared Spaces", TraceStartupTime); |
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646 ResourceMark rm; |
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647 |
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648 // Lock out GC - is it necessary? I don't think we care. |
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649 No_GC_Verifier no_gc; |
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650 |
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651 // Preload classes to be shared. |
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652 // Should use some os:: method rather than fopen() here. aB. |
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653 // Construct the path to the class list (in jre/lib) |
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654 // Walk up two directories from the location of the VM and |
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655 // optionally tack on "lib" (depending on platform) |
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656 char class_list_path[JVM_MAXPATHLEN]; |
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657 os::jvm_path(class_list_path, sizeof(class_list_path)); |
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658 for (int i = 0; i < 3; i++) { |
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659 char *end = strrchr(class_list_path, *os::file_separator()); |
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660 if (end != NULL) *end = '\0'; |
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661 } |
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662 int class_list_path_len = (int)strlen(class_list_path); |
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663 if (class_list_path_len >= 3) { |
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664 if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) { |
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665 strcat(class_list_path, os::file_separator()); |
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666 strcat(class_list_path, "lib"); |
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667 } |
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668 } |
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669 strcat(class_list_path, os::file_separator()); |
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670 strcat(class_list_path, "classlist"); |
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671 |
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672 FILE* file = fopen(class_list_path, "r"); |
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673 if (file != NULL) { |
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674 jlong computed_jsum = JSUM_SEED; |
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675 jlong file_jsum = 0; |
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676 |
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677 char class_name[256]; |
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678 int class_count = 0; |
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679 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>(); |
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680 |
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681 // sun.io.Converters |
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682 static const char obj_array_sig[] = "[[Ljava/lang/Object;"; |
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683 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD); |
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684 |
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685 // java.util.HashMap |
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686 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;"; |
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687 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD); |
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688 |
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689 tty->print("Loading classes to share ... "); |
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690 while ((fgets(class_name, sizeof class_name, file)) != NULL) { |
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691 if (*class_name == '#') { |
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692 jint fsh, fsl; |
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693 if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) { |
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694 file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff); |
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695 } |
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696 |
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697 continue; |
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698 } |
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699 // Remove trailing newline |
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700 size_t name_len = strlen(class_name); |
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701 class_name[name_len-1] = '\0'; |
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702 |
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703 computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1); |
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704 |
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705 // Got a class name - load it. |
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706 TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD); |
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707 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol."); |
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708 Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol, |
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709 THREAD); |
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710 guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class."); |
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711 if (klass != NULL) { |
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712 if (PrintSharedSpaces && Verbose && WizardMode) { |
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713 tty->print_cr("Shared spaces preloaded: %s", class_name); |
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714 } |
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715 |
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716 |
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717 InstanceKlass* ik = InstanceKlass::cast(klass); |
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718 |
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719 // Should be class load order as per -XX:+TraceClassLoadingPreorder |
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720 class_promote_order->append(ik); |
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|
721 |
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722 // Link the class to cause the bytecodes to be rewritten and the |
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723 // cpcache to be created. The linking is done as soon as classes |
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724 // are loaded in order that the related data structures (klass and |
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725 // cpCache) are located together. |
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|
726 |
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727 if (ik->init_state() < InstanceKlass::linked) { |
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728 ik->link_class(THREAD); |
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729 guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting"); |
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|
730 } |
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|
731 |
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|
732 // TODO: Resolve klasses in constant pool |
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|
733 ik->constants()->resolve_class_constants(THREAD); |
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|
734 |
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|
735 class_count++; |
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|
736 } else { |
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|
737 if (PrintSharedSpaces && Verbose && WizardMode) { |
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|
738 tty->cr(); |
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739 tty->print_cr(" Preload failed: %s", class_name); |
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|
740 } |
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|
741 } |
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742 file_jsum = 0; // Checksum must be on last line of file |
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|
743 } |
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744 if (computed_jsum != file_jsum) { |
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|
745 tty->cr(); |
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746 tty->print_cr("Preload failed: checksum of class list was incorrect."); |
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|
747 exit(1); |
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|
748 } |
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|
749 |
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750 tty->print_cr("done. "); |
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|
751 |
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752 if (PrintSharedSpaces) { |
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753 tty->print_cr("Shared spaces: preloaded %d classes", class_count); |
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|
754 } |
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|
755 |
da91efe96a93
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756 // Rewrite and unlink classes. |
da91efe96a93
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|
757 tty->print("Rewriting and linking classes ... "); |
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|
758 |
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759 // Link any classes which got missed. (It's not quite clear why |
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760 // they got missed.) This iteration would be unsafe if we weren't |
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761 // single-threaded at this point; however we can't do it on the VM |
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762 // thread because it requires object allocation. |
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|
763 SystemDictionary::classes_do(link_shared_classes, CATCH); |
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|
764 tty->print_cr("done. "); |
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|
765 |
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766 // Create and dump the shared spaces. Everything so far is loaded |
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767 // with the null class loader. |
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768 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); |
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769 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order); |
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|
770 VMThread::execute(&op); |
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|
771 |
da91efe96a93
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772 } else { |
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773 char errmsg[JVM_MAXPATHLEN]; |
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774 os::lasterror(errmsg, JVM_MAXPATHLEN); |
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775 tty->print_cr("Loading classlist failed: %s", errmsg); |
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|
776 exit(1); |
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|
777 } |
da91efe96a93
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|
778 |
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coleenp
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779 // Since various initialization steps have been undone by this process, |
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|
780 // it is not reasonable to continue running a java process. |
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coleenp
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781 exit(0); |
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782 } |
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coleenp
parents:
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|
783 |
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coleenp
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|
784 |
da91efe96a93
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coleenp
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|
785 // Closure for serializing initialization data in from a data area |
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|
786 // (ptr_array) read from the shared file. |
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787 |
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788 class ReadClosure : public SerializeClosure { |
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789 private: |
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790 intptr_t** _ptr_array; |
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791 |
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792 inline intptr_t nextPtr() { |
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793 return *(*_ptr_array)++; |
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794 } |
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795 |
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796 public: |
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797 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } |
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798 |
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799 void do_ptr(void** p) { |
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800 assert(*p == NULL, "initializing previous initialized pointer."); |
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801 intptr_t obj = nextPtr(); |
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802 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, |
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803 "hit tag while initializing ptrs."); |
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804 *p = (void*)obj; |
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805 } |
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806 |
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807 void do_tag(int tag) { |
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808 int old_tag; |
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809 old_tag = (int)(intptr_t)nextPtr(); |
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810 // do_int(&old_tag); |
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811 assert(tag == old_tag, "old tag doesn't match"); |
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812 FileMapInfo::assert_mark(tag == old_tag); |
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813 } |
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814 |
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815 void do_region(u_char* start, size_t size) { |
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816 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); |
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817 assert(size % sizeof(intptr_t) == 0, "bad size"); |
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818 do_tag((int)size); |
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819 while (size > 0) { |
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820 *(intptr_t*)start = nextPtr(); |
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821 start += sizeof(intptr_t); |
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822 size -= sizeof(intptr_t); |
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823 } |
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824 } |
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825 |
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826 bool reading() const { return true; } |
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827 }; |
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828 |
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829 // Return true if given address is in the mapped shared space. |
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830 bool MetaspaceShared::is_in_shared_space(const void* p) { |
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831 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p); |
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832 } |
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833 |
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834 void MetaspaceShared::print_shared_spaces() { |
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835 if (UseSharedSpaces) { |
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836 FileMapInfo::current_info()->print_shared_spaces(); |
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837 } |
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838 } |
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839 |
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840 |
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841 // Map shared spaces at requested addresses and return if succeeded. |
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842 // Need to keep the bounds of the ro and rw space for the Metaspace::contains |
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843 // call, or is_in_shared_space. |
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844 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { |
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845 size_t image_alignment = mapinfo->alignment(); |
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846 |
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847 #ifndef _WINDOWS |
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848 // Map in the shared memory and then map the regions on top of it. |
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849 // On Windows, don't map the memory here because it will cause the |
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850 // mappings of the regions to fail. |
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851 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); |
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852 if (!shared_rs.is_reserved()) return false; |
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853 #endif |
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854 |
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855 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); |
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856 |
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857 char* _ro_base = NULL; |
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858 char* _rw_base = NULL; |
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859 char* _md_base = NULL; |
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860 char* _mc_base = NULL; |
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861 |
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862 // Map each shared region |
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863 if ((_ro_base = mapinfo->map_region(ro)) != NULL && |
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864 (_rw_base = mapinfo->map_region(rw)) != NULL && |
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865 (_md_base = mapinfo->map_region(md)) != NULL && |
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866 (_mc_base = mapinfo->map_region(mc)) != NULL && |
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867 (image_alignment == (size_t)max_alignment())) { |
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868 // Success (no need to do anything) |
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869 return true; |
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870 } else { |
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871 // If there was a failure in mapping any of the spaces, unmap the ones |
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872 // that succeeded |
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873 if (_ro_base != NULL) mapinfo->unmap_region(ro); |
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874 if (_rw_base != NULL) mapinfo->unmap_region(rw); |
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875 if (_md_base != NULL) mapinfo->unmap_region(md); |
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876 if (_mc_base != NULL) mapinfo->unmap_region(mc); |
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877 #ifndef _WINDOWS |
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878 // Release the entire mapped region |
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879 shared_rs.release(); |
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880 #endif |
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881 // If -Xshare:on is specified, print out the error message and exit VM, |
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882 // otherwise, set UseSharedSpaces to false and continue. |
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883 if (RequireSharedSpaces) { |
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884 vm_exit_during_initialization("Unable to use shared archive.", NULL); |
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885 } else { |
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886 FLAG_SET_DEFAULT(UseSharedSpaces, false); |
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887 } |
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888 return false; |
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889 } |
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890 } |
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891 |
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892 // Read the miscellaneous data from the shared file, and |
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893 // serialize it out to its various destinations. |
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894 |
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895 void MetaspaceShared::initialize_shared_spaces() { |
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896 FileMapInfo *mapinfo = FileMapInfo::current_info(); |
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897 |
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898 char* buffer = mapinfo->region_base(md); |
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899 |
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900 // Skip over (reserve space for) a list of addresses of C++ vtables |
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901 // for Klass objects. They get filled in later. |
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902 |
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903 void** vtbl_list = (void**)buffer; |
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904 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*); |
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905 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
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906 |
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907 // Skip over (reserve space for) dummy C++ vtables Klass objects. |
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908 // They are used as is. |
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909 |
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910 intptr_t vtable_size = *(intptr_t*)buffer; |
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911 buffer += sizeof(intptr_t); |
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912 buffer += vtable_size; |
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913 |
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914 // Create the symbol table using the bucket array at this spot in the |
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915 // misc data space. Since the symbol table is often modified, this |
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916 // region (of mapped pages) will be copy-on-write. |
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917 |
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918 int symbolTableLen = *(intptr_t*)buffer; |
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919 buffer += sizeof(intptr_t); |
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920 int number_of_entries = *(intptr_t*)buffer; |
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921 buffer += sizeof(intptr_t); |
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922 SymbolTable::create_table((HashtableBucket<mtSymbol>*)buffer, symbolTableLen, |
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923 number_of_entries); |
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924 buffer += symbolTableLen; |
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925 |
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926 // Create the shared dictionary using the bucket array at this spot in |
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927 // the misc data space. Since the shared dictionary table is never |
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928 // modified, this region (of mapped pages) will be (effectively, if |
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929 // not explicitly) read-only. |
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930 |
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931 int sharedDictionaryLen = *(intptr_t*)buffer; |
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932 buffer += sizeof(intptr_t); |
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933 number_of_entries = *(intptr_t*)buffer; |
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934 buffer += sizeof(intptr_t); |
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935 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, |
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936 sharedDictionaryLen, |
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937 number_of_entries); |
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938 buffer += sharedDictionaryLen; |
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939 |
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940 // Create the package info table using the bucket array at this spot in |
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941 // the misc data space. Since the package info table is never |
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942 // modified, this region (of mapped pages) will be (effectively, if |
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943 // not explicitly) read-only. |
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944 |
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945 int pkgInfoLen = *(intptr_t*)buffer; |
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946 buffer += sizeof(intptr_t); |
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947 number_of_entries = *(intptr_t*)buffer; |
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948 buffer += sizeof(intptr_t); |
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949 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen, |
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950 number_of_entries); |
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951 buffer += pkgInfoLen; |
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952 ClassLoader::verify(); |
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953 |
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954 // The following data in the shared misc data region are the linked |
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955 // list elements (HashtableEntry objects) for the symbol table, string |
14309 | 956 // table, and shared dictionary. The heap objects referred to by the |
6725
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957 // symbol table, string table, and shared dictionary are permanent and |
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958 // unmovable. Since new entries added to the string and symbol tables |
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959 // are always added at the beginning of the linked lists, THESE LINKED |
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960 // LIST ELEMENTS ARE READ-ONLY. |
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961 |
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962 int len = *(intptr_t*)buffer; // skip over symbol table entries |
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963 buffer += sizeof(intptr_t); |
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964 buffer += len; |
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965 |
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966 len = *(intptr_t*)buffer; // skip over shared dictionary entries |
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967 buffer += sizeof(intptr_t); |
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968 buffer += len; |
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969 |
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970 len = *(intptr_t*)buffer; // skip over package info table entries |
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971 buffer += sizeof(intptr_t); |
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972 buffer += len; |
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973 |
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974 len = *(intptr_t*)buffer; // skip over package info table char[] arrays. |
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975 buffer += sizeof(intptr_t); |
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976 buffer += len; |
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977 |
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978 intptr_t* array = (intptr_t*)buffer; |
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979 ReadClosure rc(&array); |
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980 serialize(&rc); |
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981 |
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982 // Close the mapinfo file |
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983 mapinfo->close(); |
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984 } |
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985 |
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986 // JVM/TI RedefineClasses() support: |
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987 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { |
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988 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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989 |
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990 if (UseSharedSpaces) { |
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991 // remap the shared readonly space to shared readwrite, private |
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992 FileMapInfo* mapinfo = FileMapInfo::current_info(); |
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993 if (!mapinfo->remap_shared_readonly_as_readwrite()) { |
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994 return false; |
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995 } |
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996 } |
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997 return true; |
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998 } |