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1 /* |
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2 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_MEMORY_METASPACESHARED_HPP |
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26 #define SHARE_VM_MEMORY_METASPACESHARED_HPP |
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27 |
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28 #include "classfile/compactHashtable.hpp" |
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29 #include "memory/allocation.hpp" |
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30 #include "memory/memRegion.hpp" |
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31 #include "memory/virtualspace.hpp" |
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32 #include "oops/oop.inline.hpp" |
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33 #include "utilities/exceptions.hpp" |
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34 #include "utilities/macros.hpp" |
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35 #include "utilities/resourceHash.hpp" |
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36 |
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37 #define MAX_SHARED_DELTA (0x7FFFFFFF) |
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38 |
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39 class FileMapInfo; |
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40 |
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41 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { |
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42 public: |
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43 MetaspaceSharedStats() { |
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44 memset(this, 0, sizeof(*this)); |
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45 } |
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46 CompactHashtableStats symbol; |
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47 CompactHashtableStats string; |
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48 }; |
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49 |
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50 // Class Data Sharing Support |
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51 class MetaspaceShared : AllStatic { |
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52 |
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53 // CDS support |
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54 static ReservedSpace _shared_rs; |
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55 static VirtualSpace _shared_vs; |
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56 static int _max_alignment; |
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57 static MetaspaceSharedStats _stats; |
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58 static bool _has_error_classes; |
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59 static bool _archive_loading_failed; |
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60 static bool _remapped_readwrite; |
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61 static bool _open_archive_heap_region_mapped; |
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62 static address _cds_i2i_entry_code_buffers; |
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63 static size_t _cds_i2i_entry_code_buffers_size; |
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64 static size_t _core_spaces_size; |
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65 public: |
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66 enum { |
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67 // core archive spaces |
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68 mc = 0, // miscellaneous code for method trampolines |
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69 rw = 1, // read-write shared space in the heap |
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70 ro = 2, // read-only shared space in the heap |
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71 md = 3, // miscellaneous data for initializing tables, etc. |
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72 num_core_spaces = 4, // number of non-string regions |
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73 |
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74 // optional mapped spaces |
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75 // Currently it only contains class file data. |
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76 od = num_core_spaces, |
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77 num_non_heap_spaces = od + 1, |
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78 |
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79 // mapped java heap regions |
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80 first_string = od + 1, // index of first string region |
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81 max_strings = 2, // max number of string regions in string space |
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82 first_open_archive_heap_region = first_string + max_strings, |
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83 max_open_archive_heap_region = 2, |
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84 |
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85 last_valid_region = first_open_archive_heap_region + max_open_archive_heap_region - 1, |
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86 n_regions = last_valid_region + 1 // total number of regions |
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87 }; |
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88 |
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89 static void prepare_for_dumping() NOT_CDS_RETURN; |
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90 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; |
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91 static int preload_classes(const char * class_list_path, |
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92 TRAPS) NOT_CDS_RETURN_(0); |
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93 |
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94 #if INCLUDE_CDS_JAVA_HEAP |
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95 private: |
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96 static bool obj_equals(oop const& p1, oop const& p2) { |
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97 return p1 == p2; |
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98 } |
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99 static unsigned obj_hash(oop const& p) { |
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100 assert(!p->mark()->has_bias_pattern(), |
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101 "this object should never have been locked"); // so identity_hash won't safepoin |
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102 unsigned hash = (unsigned)p->identity_hash(); |
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103 return hash; |
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104 } |
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105 typedef ResourceHashtable<oop, oop, |
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106 MetaspaceShared::obj_hash, |
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107 MetaspaceShared::obj_equals, |
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108 15889, // prime number |
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109 ResourceObj::C_HEAP> ArchivedObjectCache; |
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110 static ArchivedObjectCache* _archive_object_cache; |
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111 |
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112 public: |
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113 static ArchivedObjectCache* archive_object_cache() { |
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114 return _archive_object_cache; |
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115 } |
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116 static oop archive_heap_object(oop obj, Thread* THREAD); |
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117 static void archive_resolved_constants(Thread* THREAD); |
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118 #endif |
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119 static bool is_heap_object_archiving_allowed() { |
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120 CDS_JAVA_HEAP_ONLY(return (UseG1GC && UseCompressedOops && UseCompressedClassPointers);) |
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121 NOT_CDS_JAVA_HEAP(return false;) |
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122 } |
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123 static void create_archive_object_cache() { |
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124 CDS_JAVA_HEAP_ONLY(_archive_object_cache = new (ResourceObj::C_HEAP, mtClass)ArchivedObjectCache();); |
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125 } |
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126 static void destroy_archive_object_cache() { |
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127 CDS_JAVA_HEAP_ONLY(delete _archive_object_cache; _archive_object_cache = NULL;); |
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128 } |
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129 static void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN; |
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130 |
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131 static void dump_open_archive_heap_objects(GrowableArray<MemRegion> * open_archive) NOT_CDS_JAVA_HEAP_RETURN; |
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132 static void set_open_archive_heap_region_mapped() { |
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133 CDS_JAVA_HEAP_ONLY(_open_archive_heap_region_mapped = true); |
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134 NOT_CDS_JAVA_HEAP_RETURN; |
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135 } |
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136 static bool open_archive_heap_region_mapped() { |
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137 CDS_JAVA_HEAP_ONLY(return _open_archive_heap_region_mapped); |
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138 NOT_CDS_JAVA_HEAP_RETURN_(false); |
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139 } |
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140 |
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141 static ReservedSpace* shared_rs() { |
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142 CDS_ONLY(return &_shared_rs); |
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143 NOT_CDS(return NULL); |
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144 } |
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145 static void commit_shared_space_to(char* newtop) NOT_CDS_RETURN; |
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146 static size_t core_spaces_size() { |
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147 return _core_spaces_size; |
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148 } |
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149 static void initialize_shared_rs() NOT_CDS_RETURN; |
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150 |
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151 // Delta of this object from the bottom of the archive. |
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152 static uintx object_delta(void* obj) { |
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153 assert(DumpSharedSpaces, "supported only for dumping"); |
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154 assert(shared_rs()->contains(obj), "must be"); |
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155 address base_address = address(shared_rs()->base()); |
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156 uintx delta = address(obj) - base_address; |
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157 return delta; |
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158 } |
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159 |
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160 static void set_archive_loading_failed() { |
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161 _archive_loading_failed = true; |
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162 } |
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163 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); |
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164 static void initialize_shared_spaces() NOT_CDS_RETURN; |
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165 |
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166 // Return true if given address is in the mapped shared space. |
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167 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
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168 |
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169 // Return true if given address is in the shared region corresponding to the idx |
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170 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); |
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171 |
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172 static bool is_heap_region(int idx) { |
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173 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && |
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174 idx < MetaspaceShared::first_open_archive_heap_region + |
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175 MetaspaceShared::max_open_archive_heap_region)); |
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176 NOT_CDS_JAVA_HEAP_RETURN_(false); |
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177 } |
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178 static bool is_string_region(int idx) { |
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179 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && |
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180 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings)); |
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181 NOT_CDS_JAVA_HEAP_RETURN_(false); |
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182 } |
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183 static bool is_open_archive_heap_region(int idx) { |
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184 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_open_archive_heap_region && |
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185 idx < MetaspaceShared::first_open_archive_heap_region + |
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186 MetaspaceShared::max_open_archive_heap_region)); |
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187 NOT_CDS_JAVA_HEAP_RETURN_(false); |
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188 } |
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189 static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false); |
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190 |
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191 static void allocate_cpp_vtable_clones(); |
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192 static intptr_t* clone_cpp_vtables(intptr_t* p); |
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193 static void zero_cpp_vtable_clones_for_writing(); |
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194 static void patch_cpp_vtable_pointers(); |
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195 static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false); |
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196 static void serialize(SerializeClosure* sc); |
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197 |
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198 static MetaspaceSharedStats* stats() { |
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199 return &_stats; |
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200 } |
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201 |
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202 static void report_out_of_space(const char* name, size_t needed_bytes); |
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203 |
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204 // JVM/TI RedefineClasses() support: |
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205 // Remap the shared readonly space to shared readwrite, private if |
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206 // sharing is enabled. Simply returns true if sharing is not enabled |
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207 // or if the remapping has already been done by a prior call. |
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208 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); |
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209 static bool remapped_readwrite() { |
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210 CDS_ONLY(return _remapped_readwrite); |
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211 NOT_CDS(return false); |
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212 } |
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213 |
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214 static void print_shared_spaces(); |
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215 |
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216 static bool try_link_class(InstanceKlass* ik, TRAPS); |
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217 static void link_and_cleanup_shared_classes(TRAPS); |
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218 static void check_shared_class_loader_type(Klass* obj); |
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219 |
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220 // Allocate a block of memory from the "mc", "ro", or "rw" regions. |
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221 static char* misc_code_space_alloc(size_t num_bytes); |
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222 static char* read_only_space_alloc(size_t num_bytes); |
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223 |
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224 template <typename T> |
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225 static Array<T>* new_ro_array(int length) { |
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226 #if INCLUDE_CDS |
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227 size_t byte_size = Array<T>::byte_sizeof(length, sizeof(T)); |
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228 Array<T>* array = (Array<T>*)read_only_space_alloc(byte_size); |
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229 array->initialize(length); |
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230 return array; |
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231 #else |
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232 return NULL; |
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233 #endif |
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234 } |
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235 |
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236 static address cds_i2i_entry_code_buffers(size_t total_size); |
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237 |
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238 static address cds_i2i_entry_code_buffers() { |
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239 return _cds_i2i_entry_code_buffers; |
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240 } |
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241 static size_t cds_i2i_entry_code_buffers_size() { |
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242 return _cds_i2i_entry_code_buffers_size; |
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243 } |
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244 static void relocate_klass_ptr(oop o); |
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245 }; |
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246 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP |