Mercurial > hg > graal-compiler
annotate src/share/vm/memory/metaspaceShared.cpp @ 7183:b2dbd323c668
8003848: Make ConstMethod::generic_signature_index optional and move Method::_max_stack to ConstMethod.
Summary: Make ConstMethod::generic_signature_index optional and move Method::_max_stack to ConstMethod.
Reviewed-by: bdelsart, sspitsyn, coleenp
author | jiangli |
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date | Tue, 27 Nov 2012 17:03:56 -0500 |
parents | 070d523b96a7 |
children | 6c3f47d964f3 |
rev | line source |
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1 /* |
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2 * Copyright (c) 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/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 assert(!UseCompressedOops, "UseCompressedOops doesn't work with shared archive"); |
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56 // Verify the sizes of various metadata in the system. |
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57 soc->do_tag(sizeof(Method)); |
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58 soc->do_tag(sizeof(ConstMethod)); |
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59 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); |
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60 soc->do_tag(sizeof(ConstantPool)); |
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61 soc->do_tag(sizeof(ConstantPoolCache)); |
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62 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); |
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63 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); |
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64 soc->do_tag(sizeof(Symbol)); |
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65 |
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66 // Dump/restore miscellaneous metadata. |
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67 Universe::serialize(soc, true); |
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68 soc->do_tag(--tag); |
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69 |
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70 // Dump/restore references to commonly used names and signatures. |
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71 vmSymbols::serialize(soc); |
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72 soc->do_tag(--tag); |
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73 |
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74 soc->do_tag(666); |
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75 } |
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76 |
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77 |
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78 // CDS code for dumping shared archive. |
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79 |
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80 // Global object for holding classes that have been loaded. Since this |
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81 // is run at a safepoint just before exit, this is the entire set of classes. |
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82 static GrowableArray<Klass*>* _global_klass_objects; |
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83 static void collect_classes(Klass* k) { |
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84 _global_klass_objects->append_if_missing(k); |
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85 if (k->oop_is_instance()) { |
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86 // Add in the array classes too |
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87 InstanceKlass* ik = InstanceKlass::cast(k); |
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88 ik->array_klasses_do(collect_classes); |
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89 } |
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90 } |
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91 |
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92 static void remove_unshareable_in_classes() { |
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93 for (int i = 0; i < _global_klass_objects->length(); i++) { |
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94 Klass* k = _global_klass_objects->at(i); |
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95 k->remove_unshareable_info(); |
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96 } |
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97 } |
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98 |
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99 // Walk all methods in the class list and assign a fingerprint. |
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100 // so that this part of the ConstMethod* is read only. |
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101 static void calculate_fingerprints() { |
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102 for (int i = 0; i < _global_klass_objects->length(); i++) { |
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103 Klass* k = _global_klass_objects->at(i); |
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104 if (k->oop_is_instance()) { |
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105 InstanceKlass* ik = InstanceKlass::cast(k); |
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106 for (int i = 0; i < ik->methods()->length(); i++) { |
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107 ResourceMark rm; |
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108 Method* m = ik->methods()->at(i); |
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109 (new Fingerprinter(m))->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 |
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247 // Populate the shared space. |
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248 |
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249 class VM_PopulateDumpSharedSpace: public VM_Operation { |
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250 private: |
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251 ClassLoaderData* _loader_data; |
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252 GrowableArray<Klass*> *_class_promote_order; |
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253 VirtualSpace _md_vs; |
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254 VirtualSpace _mc_vs; |
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255 |
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256 public: |
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257 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data, |
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258 GrowableArray<Klass*> *class_promote_order) : |
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259 _loader_data(loader_data) { |
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260 |
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261 // Split up and initialize the misc code and data spaces |
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262 ReservedSpace* shared_rs = MetaspaceShared::shared_rs(); |
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263 int metadata_size = SharedReadOnlySize+SharedReadWriteSize; |
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264 ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size); |
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265 ReservedSpace misc_section = shared_rs->last_part(metadata_size); |
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266 |
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267 // Now split into misc sections. |
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268 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize); |
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269 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize); |
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270 _md_vs.initialize(md_rs, SharedMiscDataSize); |
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271 _mc_vs.initialize(mc_rs, SharedMiscCodeSize); |
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272 _class_promote_order = class_promote_order; |
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273 } |
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274 |
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275 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } |
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276 void doit(); // outline because gdb sucks |
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277 }; // class VM_PopulateDumpSharedSpace |
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278 |
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279 |
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280 void VM_PopulateDumpSharedSpace::doit() { |
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281 Thread* THREAD = VMThread::vm_thread(); |
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282 NOT_PRODUCT(SystemDictionary::verify();) |
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283 // The following guarantee is meant to ensure that no loader constraints |
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284 // exist yet, since the constraints table is not shared. This becomes |
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285 // more important now that we don't re-initialize vtables/itables for |
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286 // shared classes at runtime, where constraints were previously created. |
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287 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, |
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288 "loader constraints are not saved"); |
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289 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, |
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290 "placeholders are not saved"); |
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291 // Revisit and implement this if we prelink method handle call sites: |
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292 guarantee(SystemDictionary::invoke_method_table() == NULL || |
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293 SystemDictionary::invoke_method_table()->number_of_entries() == 0, |
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294 "invoke method table is not saved"); |
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295 |
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296 // At this point, many classes have been loaded. |
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297 // Gather systemDictionary classes in a global array and do everything to |
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298 // that so we don't have to walk the SystemDictionary again. |
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299 _global_klass_objects = new GrowableArray<Klass*>(1000); |
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300 Universe::basic_type_classes_do(collect_classes); |
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301 SystemDictionary::classes_do(collect_classes); |
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302 |
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303 tty->print_cr("Number of classes %d", _global_klass_objects->length()); |
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304 |
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305 // Update all the fingerprints in the shared methods. |
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306 tty->print("Calculating fingerprints ... "); |
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307 calculate_fingerprints(); |
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308 tty->print_cr("done. "); |
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309 |
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310 // Remove all references outside the metadata |
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311 tty->print("Removing unshareable information ... "); |
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312 remove_unshareable_in_classes(); |
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313 tty->print_cr("done. "); |
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314 |
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315 // Set up the share data and shared code segments. |
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316 char* md_low = _md_vs.low(); |
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317 char* md_top = md_low; |
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318 char* md_end = _md_vs.high(); |
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319 char* mc_low = _mc_vs.low(); |
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320 char* mc_top = mc_low; |
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321 char* mc_end = _mc_vs.high(); |
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322 |
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323 // Reserve space for the list of Klass*s whose vtables are used |
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324 // for patching others as needed. |
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325 |
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326 void** vtbl_list = (void**)md_top; |
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327 int vtbl_list_size = MetaspaceShared::vtbl_list_size; |
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328 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
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329 |
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330 md_top += vtbl_list_size * sizeof(void*); |
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331 void* vtable = md_top; |
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332 |
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333 // Reserve space for a new dummy vtable for klass objects in the |
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334 // heap. Generate self-patching vtable entries. |
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335 |
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336 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable, |
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337 &md_top, md_end, |
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338 &mc_top, mc_end); |
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339 |
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340 // Reorder the system dictionary. (Moving the symbols affects |
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341 // how the hash table indices are calculated.) |
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342 // Not doing this either. |
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343 |
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344 SystemDictionary::reorder_dictionary(); |
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345 |
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346 NOT_PRODUCT(SystemDictionary::verify();) |
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347 |
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348 // Copy the the symbol table, and the system dictionary to the shared |
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349 // space in usable form. Copy the hastable |
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350 // buckets first [read-write], then copy the linked lists of entries |
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351 // [read-only]. |
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352 |
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353 SymbolTable::reverse(md_top); |
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354 NOT_PRODUCT(SymbolTable::verify()); |
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355 SymbolTable::copy_buckets(&md_top, md_end); |
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356 |
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357 SystemDictionary::reverse(); |
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358 SystemDictionary::copy_buckets(&md_top, md_end); |
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359 |
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360 ClassLoader::verify(); |
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361 ClassLoader::copy_package_info_buckets(&md_top, md_end); |
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362 ClassLoader::verify(); |
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363 |
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364 SymbolTable::copy_table(&md_top, md_end); |
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365 SystemDictionary::copy_table(&md_top, md_end); |
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366 ClassLoader::verify(); |
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367 ClassLoader::copy_package_info_table(&md_top, md_end); |
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368 ClassLoader::verify(); |
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369 |
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370 // Write the other data to the output array. |
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371 WriteClosure wc(md_top, md_end); |
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372 MetaspaceShared::serialize(&wc); |
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373 md_top = wc.get_top(); |
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374 |
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375 // Print shared spaces all the time |
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376 const char* fmt = "%s space: " PTR_FORMAT " out of " PTR_FORMAT " words allocated at " PTR_FORMAT "."; |
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377 Metaspace* ro_space = _loader_data->ro_metaspace(); |
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378 Metaspace* rw_space = _loader_data->rw_metaspace(); |
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379 tty->print_cr(fmt, "ro", ro_space->used_words(Metaspace::NonClassType), |
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380 ro_space->capacity_words(Metaspace::NonClassType), |
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381 ro_space->bottom()); |
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382 tty->print_cr(fmt, "rw", rw_space->used_words(Metaspace::NonClassType), |
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383 rw_space->capacity_words(Metaspace::NonClassType), |
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384 rw_space->bottom()); |
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385 tty->print_cr(fmt, "md", md_top - md_low, md_end-md_low, md_low); |
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386 tty->print_cr(fmt, "mc", mc_top - mc_low, mc_end-mc_low, mc_low); |
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387 |
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388 // Update the vtable pointers in all of the Klass objects in the |
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389 // heap. They should point to newly generated vtable. |
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390 patch_klass_vtables(vtbl_list, vtable); |
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391 |
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392 // dunno what this is for. |
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393 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass); |
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394 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*)); |
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395 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*)); |
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396 |
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397 // Create and write the archive file that maps the shared spaces. |
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398 |
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399 FileMapInfo* mapinfo = new FileMapInfo(); |
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400 mapinfo->populate_header(MetaspaceShared::max_alignment()); |
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401 |
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402 // Pass 1 - update file offsets in header. |
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403 mapinfo->write_header(); |
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404 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
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405 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
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406 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
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407 pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
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408 SharedMiscDataSize, |
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409 false, false); |
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410 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
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411 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
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412 SharedMiscCodeSize, |
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413 true, true); |
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414 |
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415 // Pass 2 - write data. |
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416 mapinfo->open_for_write(); |
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417 mapinfo->write_header(); |
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418 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
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419 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
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420 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
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421 pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
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422 SharedMiscDataSize, |
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423 false, false); |
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424 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
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425 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
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426 SharedMiscCodeSize, |
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427 true, true); |
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428 mapinfo->close(); |
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429 |
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430 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*)); |
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431 } |
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432 |
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433 static void link_shared_classes(Klass* obj, TRAPS) { |
6983 | 434 Klass* k = obj; |
6725
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435 if (k->oop_is_instance()) { |
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436 InstanceKlass* ik = (InstanceKlass*) k; |
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437 // Link the class to cause the bytecodes to be rewritten and the |
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438 // cpcache to be created. |
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439 if (ik->init_state() < InstanceKlass::linked) { |
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440 ik->link_class(THREAD); |
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441 guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting"); |
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442 } |
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443 } |
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444 } |
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445 |
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446 |
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447 // Support for a simple checksum of the contents of the class list |
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448 // file to prevent trivial tampering. The algorithm matches that in |
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449 // the MakeClassList program used by the J2SE build process. |
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450 #define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe)) |
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451 static jlong |
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452 jsum(jlong start, const char *buf, const int len) |
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453 { |
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454 jlong h = start; |
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455 char *p = (char *)buf, *e = p + len; |
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456 while (p < e) { |
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457 char c = *p++; |
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458 if (c <= ' ') { |
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459 /* Skip spaces and control characters */ |
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460 continue; |
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461 } |
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462 h = 31 * h + c; |
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463 } |
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464 return h; |
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465 } |
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466 |
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467 // Preload classes from a list, populate the shared spaces and dump to a |
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468 // file. |
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469 void MetaspaceShared::preload_and_dump(TRAPS) { |
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470 TraceTime timer("Dump Shared Spaces", TraceStartupTime); |
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471 ResourceMark rm; |
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472 |
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473 // Lock out GC - is it necessary? I don't think we care. |
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474 No_GC_Verifier no_gc; |
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475 |
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476 // Preload classes to be shared. |
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477 // Should use some os:: method rather than fopen() here. aB. |
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478 // Construct the path to the class list (in jre/lib) |
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479 // Walk up two directories from the location of the VM and |
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480 // optionally tack on "lib" (depending on platform) |
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481 char class_list_path[JVM_MAXPATHLEN]; |
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482 os::jvm_path(class_list_path, sizeof(class_list_path)); |
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483 for (int i = 0; i < 3; i++) { |
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484 char *end = strrchr(class_list_path, *os::file_separator()); |
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485 if (end != NULL) *end = '\0'; |
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486 } |
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487 int class_list_path_len = (int)strlen(class_list_path); |
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488 if (class_list_path_len >= 3) { |
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489 if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) { |
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490 strcat(class_list_path, os::file_separator()); |
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491 strcat(class_list_path, "lib"); |
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492 } |
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493 } |
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494 strcat(class_list_path, os::file_separator()); |
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495 strcat(class_list_path, "classlist"); |
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496 |
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497 FILE* file = fopen(class_list_path, "r"); |
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498 if (file != NULL) { |
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499 jlong computed_jsum = JSUM_SEED; |
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500 jlong file_jsum = 0; |
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501 |
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502 char class_name[256]; |
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503 int class_count = 0; |
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504 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>(); |
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505 |
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506 // sun.io.Converters |
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507 static const char obj_array_sig[] = "[[Ljava/lang/Object;"; |
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508 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD); |
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509 |
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510 // java.util.HashMap |
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511 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;"; |
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512 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD); |
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513 |
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514 tty->print("Loading classes to share ... "); |
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515 while ((fgets(class_name, sizeof class_name, file)) != NULL) { |
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516 if (*class_name == '#') { |
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517 jint fsh, fsl; |
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518 if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) { |
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519 file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff); |
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520 } |
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521 |
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522 continue; |
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523 } |
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524 // Remove trailing newline |
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525 size_t name_len = strlen(class_name); |
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526 class_name[name_len-1] = '\0'; |
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527 |
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528 computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1); |
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529 |
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530 // Got a class name - load it. |
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531 TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD); |
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532 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol."); |
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533 Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol, |
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534 THREAD); |
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535 guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class."); |
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536 if (klass != NULL) { |
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537 if (PrintSharedSpaces && Verbose && WizardMode) { |
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538 tty->print_cr("Shared spaces preloaded: %s", class_name); |
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539 } |
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540 |
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541 |
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542 InstanceKlass* ik = InstanceKlass::cast(klass); |
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543 |
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544 // Should be class load order as per -XX:+TraceClassLoadingPreorder |
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545 class_promote_order->append(ik); |
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546 |
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547 // Link the class to cause the bytecodes to be rewritten and the |
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548 // cpcache to be created. The linking is done as soon as classes |
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549 // are loaded in order that the related data structures (klass and |
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550 // cpCache) are located together. |
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551 |
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552 if (ik->init_state() < InstanceKlass::linked) { |
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553 ik->link_class(THREAD); |
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554 guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting"); |
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555 } |
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556 |
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557 // TODO: Resolve klasses in constant pool |
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558 ik->constants()->resolve_class_constants(THREAD); |
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559 |
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560 class_count++; |
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561 } else { |
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562 if (PrintSharedSpaces && Verbose && WizardMode) { |
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563 tty->cr(); |
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564 tty->print_cr(" Preload failed: %s", class_name); |
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565 } |
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566 } |
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567 file_jsum = 0; // Checksum must be on last line of file |
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568 } |
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569 if (computed_jsum != file_jsum) { |
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570 tty->cr(); |
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571 tty->print_cr("Preload failed: checksum of class list was incorrect."); |
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572 exit(1); |
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573 } |
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574 |
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575 tty->print_cr("done. "); |
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576 |
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577 if (PrintSharedSpaces) { |
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578 tty->print_cr("Shared spaces: preloaded %d classes", class_count); |
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579 } |
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580 |
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581 // Rewrite and unlink classes. |
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582 tty->print("Rewriting and linking classes ... "); |
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583 |
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584 // Link any classes which got missed. (It's not quite clear why |
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585 // they got missed.) This iteration would be unsafe if we weren't |
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586 // single-threaded at this point; however we can't do it on the VM |
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587 // thread because it requires object allocation. |
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588 SystemDictionary::classes_do(link_shared_classes, CATCH); |
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589 tty->print_cr("done. "); |
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590 |
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591 // Create and dump the shared spaces. Everything so far is loaded |
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592 // with the null class loader. |
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593 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); |
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594 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order); |
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595 VMThread::execute(&op); |
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596 |
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597 } else { |
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598 char errmsg[JVM_MAXPATHLEN]; |
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599 os::lasterror(errmsg, JVM_MAXPATHLEN); |
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600 tty->print_cr("Loading classlist failed: %s", errmsg); |
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601 exit(1); |
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602 } |
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603 |
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604 // Since various initialization steps have been undone by this process, |
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605 // it is not reasonable to continue running a java process. |
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606 exit(0); |
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607 } |
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608 |
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609 |
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610 // Closure for serializing initialization data in from a data area |
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611 // (ptr_array) read from the shared file. |
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612 |
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613 class ReadClosure : public SerializeClosure { |
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614 private: |
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615 intptr_t** _ptr_array; |
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616 |
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617 inline intptr_t nextPtr() { |
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618 return *(*_ptr_array)++; |
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619 } |
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620 |
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621 public: |
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622 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } |
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623 |
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624 void do_ptr(void** p) { |
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625 assert(*p == NULL, "initializing previous initialized pointer."); |
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626 intptr_t obj = nextPtr(); |
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627 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, |
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628 "hit tag while initializing ptrs."); |
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629 *p = (void*)obj; |
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630 } |
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631 |
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632 void do_tag(int tag) { |
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633 int old_tag; |
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634 old_tag = (int)(intptr_t)nextPtr(); |
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635 // do_int(&old_tag); |
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636 assert(tag == old_tag, "old tag doesn't match"); |
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637 FileMapInfo::assert_mark(tag == old_tag); |
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638 } |
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639 |
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640 void do_region(u_char* start, size_t size) { |
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641 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); |
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642 assert(size % sizeof(intptr_t) == 0, "bad size"); |
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643 do_tag((int)size); |
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644 while (size > 0) { |
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645 *(intptr_t*)start = nextPtr(); |
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646 start += sizeof(intptr_t); |
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647 size -= sizeof(intptr_t); |
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648 } |
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649 } |
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650 |
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651 bool reading() const { return true; } |
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652 }; |
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653 |
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654 |
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655 // Save bounds of shared spaces mapped in. |
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656 static char* _ro_base = NULL; |
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657 static char* _rw_base = NULL; |
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658 static char* _md_base = NULL; |
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659 static char* _mc_base = NULL; |
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660 |
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661 // Return true if given address is in the mapped shared space. |
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662 bool MetaspaceShared::is_in_shared_space(const void* p) { |
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663 if (_ro_base == NULL || _rw_base == NULL) { |
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664 return false; |
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665 } else { |
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666 return ((p >= _ro_base && p < (_ro_base + SharedReadOnlySize)) || |
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667 (p >= _rw_base && p < (_rw_base + SharedReadWriteSize))); |
6725
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668 } |
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669 } |
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670 |
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671 void MetaspaceShared::print_shared_spaces() { |
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672 gclog_or_tty->print_cr("Shared Spaces:"); |
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673 gclog_or_tty->print(" read-only " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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674 _ro_base, _ro_base + SharedReadOnlySize); |
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675 gclog_or_tty->print(" read-write " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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676 _rw_base, _rw_base + SharedReadWriteSize); |
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677 gclog_or_tty->cr(); |
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678 gclog_or_tty->print(" misc-data " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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679 _md_base, _md_base + SharedMiscDataSize); |
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680 gclog_or_tty->print(" misc-code " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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681 _mc_base, _mc_base + SharedMiscCodeSize); |
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682 gclog_or_tty->cr(); |
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683 } |
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684 |
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685 |
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686 // Map shared spaces at requested addresses and return if succeeded. |
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687 // Need to keep the bounds of the ro and rw space for the Metaspace::contains |
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688 // call, or is_in_shared_space. |
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689 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { |
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690 size_t image_alignment = mapinfo->alignment(); |
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|
691 |
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692 // Map in the shared memory and then map the regions on top of it |
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693 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); |
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694 if (!shared_rs.is_reserved()) return false; |
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|
695 |
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696 // Map each shared region |
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697 if ((_ro_base = mapinfo->map_region(ro)) != NULL && |
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698 (_rw_base = mapinfo->map_region(rw)) != NULL && |
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699 (_md_base = mapinfo->map_region(md)) != NULL && |
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700 (_mc_base = mapinfo->map_region(mc)) != NULL && |
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701 (image_alignment == (size_t)max_alignment())) { |
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702 // Success (no need to do anything) |
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703 return true; |
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704 } else { |
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705 // If there was a failure in mapping any of the spaces, unmap the ones |
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|
706 // that succeeded |
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707 if (_ro_base != NULL) mapinfo->unmap_region(ro); |
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708 if (_rw_base != NULL) mapinfo->unmap_region(rw); |
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709 if (_md_base != NULL) mapinfo->unmap_region(md); |
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710 if (_mc_base != NULL) mapinfo->unmap_region(mc); |
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|
711 // Release the entire mapped region |
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|
712 shared_rs.release(); |
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|
713 // If -Xshare:on is specified, print out the error message and exit VM, |
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714 // otherwise, set UseSharedSpaces to false and continue. |
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|
715 if (RequireSharedSpaces) { |
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716 vm_exit_during_initialization("Unable to use shared archive.", NULL); |
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717 } else { |
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718 FLAG_SET_DEFAULT(UseSharedSpaces, false); |
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|
719 } |
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|
720 return false; |
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|
721 } |
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|
722 } |
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|
723 |
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724 // Read the miscellaneous data from the shared file, and |
da91efe96a93
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coleenp
parents:
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|
725 // serialize it out to its various destinations. |
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|
726 |
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|
727 void MetaspaceShared::initialize_shared_spaces() { |
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|
728 FileMapInfo *mapinfo = FileMapInfo::current_info(); |
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|
729 |
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730 char* buffer = mapinfo->region_base(md); |
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|
731 |
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732 // Skip over (reserve space for) a list of addresses of C++ vtables |
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733 // for Klass objects. They get filled in later. |
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|
734 |
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735 void** vtbl_list = (void**)buffer; |
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736 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*); |
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737 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
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|
738 |
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739 // Skip over (reserve space for) dummy C++ vtables Klass objects. |
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|
740 // They are used as is. |
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|
741 |
da91efe96a93
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|
742 intptr_t vtable_size = *(intptr_t*)buffer; |
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|
743 buffer += sizeof(intptr_t); |
da91efe96a93
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|
744 buffer += vtable_size; |
da91efe96a93
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coleenp
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|
745 |
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|
746 // Create the symbol table using the bucket array at this spot in the |
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|
747 // misc data space. Since the symbol table is often modified, this |
da91efe96a93
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|
748 // region (of mapped pages) will be copy-on-write. |
da91efe96a93
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|
749 |
da91efe96a93
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coleenp
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|
750 int symbolTableLen = *(intptr_t*)buffer; |
da91efe96a93
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coleenp
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|
751 buffer += sizeof(intptr_t); |
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|
752 int number_of_entries = *(intptr_t*)buffer; |
da91efe96a93
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|
753 buffer += sizeof(intptr_t); |
da91efe96a93
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|
754 SymbolTable::create_table((HashtableBucket<mtSymbol>*)buffer, symbolTableLen, |
da91efe96a93
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|
755 number_of_entries); |
da91efe96a93
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coleenp
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|
756 buffer += symbolTableLen; |
da91efe96a93
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coleenp
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|
757 |
da91efe96a93
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coleenp
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|
758 // Create the shared dictionary using the bucket array at this spot in |
da91efe96a93
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coleenp
parents:
diff
changeset
|
759 // the misc data space. Since the shared dictionary table is never |
da91efe96a93
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coleenp
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diff
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|
760 // modified, this region (of mapped pages) will be (effectively, if |
da91efe96a93
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coleenp
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|
761 // not explicitly) read-only. |
da91efe96a93
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coleenp
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diff
changeset
|
762 |
da91efe96a93
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coleenp
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|
763 int sharedDictionaryLen = *(intptr_t*)buffer; |
da91efe96a93
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coleenp
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diff
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|
764 buffer += sizeof(intptr_t); |
da91efe96a93
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coleenp
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|
765 number_of_entries = *(intptr_t*)buffer; |
da91efe96a93
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coleenp
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|
766 buffer += sizeof(intptr_t); |
da91efe96a93
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|
767 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, |
da91efe96a93
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coleenp
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|
768 sharedDictionaryLen, |
da91efe96a93
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coleenp
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|
769 number_of_entries); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
770 buffer += sharedDictionaryLen; |
da91efe96a93
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coleenp
parents:
diff
changeset
|
771 |
da91efe96a93
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coleenp
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diff
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|
772 // Create the package info table using the bucket array at this spot in |
da91efe96a93
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coleenp
parents:
diff
changeset
|
773 // the misc data space. Since the package info table is never |
da91efe96a93
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coleenp
parents:
diff
changeset
|
774 // modified, this region (of mapped pages) will be (effectively, if |
da91efe96a93
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coleenp
parents:
diff
changeset
|
775 // not explicitly) read-only. |
da91efe96a93
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coleenp
parents:
diff
changeset
|
776 |
da91efe96a93
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coleenp
parents:
diff
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|
777 int pkgInfoLen = *(intptr_t*)buffer; |
da91efe96a93
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coleenp
parents:
diff
changeset
|
778 buffer += sizeof(intptr_t); |
da91efe96a93
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coleenp
parents:
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changeset
|
779 number_of_entries = *(intptr_t*)buffer; |
da91efe96a93
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coleenp
parents:
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|
780 buffer += sizeof(intptr_t); |
da91efe96a93
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coleenp
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|
781 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen, |
da91efe96a93
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coleenp
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|
782 number_of_entries); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
783 buffer += pkgInfoLen; |
da91efe96a93
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coleenp
parents:
diff
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|
784 ClassLoader::verify(); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
785 |
da91efe96a93
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coleenp
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diff
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|
786 // The following data in the shared misc data region are the linked |
da91efe96a93
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coleenp
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diff
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|
787 // list elements (HashtableEntry objects) for the symbol table, string |
da91efe96a93
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coleenp
parents:
diff
changeset
|
788 // table, and shared dictionary. The heap objects refered to by the |
da91efe96a93
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coleenp
parents:
diff
changeset
|
789 // symbol table, string table, and shared dictionary are permanent and |
da91efe96a93
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coleenp
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diff
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|
790 // unmovable. Since new entries added to the string and symbol tables |
da91efe96a93
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coleenp
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|
791 // are always added at the beginning of the linked lists, THESE LINKED |
da91efe96a93
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coleenp
parents:
diff
changeset
|
792 // LIST ELEMENTS ARE READ-ONLY. |
da91efe96a93
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coleenp
parents:
diff
changeset
|
793 |
da91efe96a93
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coleenp
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changeset
|
794 int len = *(intptr_t*)buffer; // skip over symbol table entries |
da91efe96a93
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coleenp
parents:
diff
changeset
|
795 buffer += sizeof(intptr_t); |
da91efe96a93
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coleenp
parents:
diff
changeset
|
796 buffer += len; |
da91efe96a93
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coleenp
parents:
diff
changeset
|
797 |
da91efe96a93
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coleenp
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|
798 len = *(intptr_t*)buffer; // skip over shared dictionary entries |
da91efe96a93
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coleenp
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|
799 buffer += sizeof(intptr_t); |
da91efe96a93
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800 buffer += len; |
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801 |
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802 len = *(intptr_t*)buffer; // skip over package info table entries |
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803 buffer += sizeof(intptr_t); |
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804 buffer += len; |
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805 |
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806 len = *(intptr_t*)buffer; // skip over package info table char[] arrays. |
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807 buffer += sizeof(intptr_t); |
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808 buffer += len; |
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809 |
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810 intptr_t* array = (intptr_t*)buffer; |
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811 ReadClosure rc(&array); |
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812 serialize(&rc); |
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813 |
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814 // Close the mapinfo file |
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815 mapinfo->close(); |
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816 } |
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817 |
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818 // JVM/TI RedefineClasses() support: |
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819 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { |
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820 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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821 |
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822 if (UseSharedSpaces) { |
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823 // remap the shared readonly space to shared readwrite, private |
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824 FileMapInfo* mapinfo = FileMapInfo::current_info(); |
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825 if (!mapinfo->remap_shared_readonly_as_readwrite()) { |
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826 return false; |
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827 } |
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828 } |
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829 return true; |
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830 } |