Mercurial > hg > graal-compiler

annotate src/share/vm/classfile/classLoaderData.hpp @ 6972:bd7a7ce2e264

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6830717: replay of compilations would help with debugging Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method. Reviewed-by: kvn, twisti, sspitsyn Contributed-by: yumin.qi@oracle.com
author minqi
date Mon, 12 Nov 2012 14:03:53 -0800
parents e861d44e0c9c
children 90273fc0a981
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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 #ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
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26 #define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "memory/memRegion.hpp"
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30 #include "memory/metaspace.hpp"
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31 #include "memory/metaspaceCounters.hpp"
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32 #include "runtime/mutex.hpp"
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33 #include "utilities/growableArray.hpp"
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34
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35 //
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36 // A class loader represents a linkset. Conceptually, a linkset identifies
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37 // the complete transitive closure of resolved links that a dynamic linker can
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38 // produce.
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39 //
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40 // A ClassLoaderData also encapsulates the allocation space, called a metaspace,
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41 // used by the dynamic linker to allocate the runtime representation of all
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42 // the types it defines.
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43 //
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44 // ClassLoaderData are stored in the runtime representation of classes and the
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45 // system dictionary, are roots of garbage collection, and provides iterators
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46 // for root tracing and other GC operations.
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47
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48 class ClassLoaderData;
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49 class JNIMethodBlock;
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50 class JNIHandleBlock;
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51 class Metadebug;
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52 // GC root for walking class loader data created
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53
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54 class ClassLoaderDataGraph : public AllStatic {
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55 friend class ClassLoaderData;
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56 friend class ClassLoaderDataGraphMetaspaceIterator;
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57 friend class VMStructs;
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58 private:
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59 // All CLDs (except the null CLD) can be reached by walking _head->_next->...
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60 static ClassLoaderData* _head;
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61 static ClassLoaderData* _unloading;
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62 // CMS support.
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63 static ClassLoaderData* _saved_head;
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64
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65 static ClassLoaderData* add(ClassLoaderData** loader_data_addr, Handle class_loader);
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66 public:
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67 static ClassLoaderData* find_or_create(Handle class_loader);
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68 static void purge();
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69 static void clear_claimed_marks();
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70 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
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71 static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
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72 static void classes_do(KlassClosure* klass_closure);
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73 static bool do_unloading(BoolObjectClosure* is_alive);
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74
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75 // CMS support.
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76 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
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77 static GrowableArray<ClassLoaderData*>* new_clds();
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78
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79 static void dump_on(outputStream * const out) PRODUCT_RETURN;
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80 static void dump() { dump_on(tty); }
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81 static void verify();
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82
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83 #ifndef PRODUCT
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84 // expensive test for pointer in metaspace for debugging
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85 static bool contains(address x);
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86 static bool contains_loader_data(ClassLoaderData* loader_data);
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87 #endif
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88 };
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89
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90 // ClassLoaderData class
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91
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92 class ClassLoaderData : public CHeapObj<mtClass> {
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93 friend class VMStructs;
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94 private:
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95 friend class ClassLoaderDataGraph;
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96 friend class ClassLoaderDataGraphMetaspaceIterator;
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97 friend class MetaDataFactory;
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98 friend class Method;
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99
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100 static ClassLoaderData * _the_null_class_loader_data;
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101
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102 oop _class_loader; // oop used to uniquely identify a class loader
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103 // class loader or a canonical class path
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104 Metaspace * _metaspace; // Meta-space where meta-data defined by the
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105 // classes in the class loader are allocated.
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106 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup.
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107 bool _unloading; // true if this class loader goes away
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108 volatile int _claimed; // true if claimed, for example during GC traces.
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109 // To avoid applying oop closure more than once.
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110 // Has to be an int because we cas it.
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111 Klass* _klasses; // The classes defined by the class loader.
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112
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113 JNIHandleBlock* _handles; // Handles to constant pool arrays
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114
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115 // These method IDs are created for the class loader and set to NULL when the
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116 // class loader is unloaded. They are rarely freed, only for redefine classes
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117 // and if they lose a data race in InstanceKlass.
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118 JNIMethodBlock* _jmethod_ids;
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119
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120 // Metadata to be deallocated when it's safe at class unloading, when
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121 // this class loader isn't unloaded itself.
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122 GrowableArray<Metadata*>* _deallocate_list;
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123
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124 // Support for walking class loader data objects
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125 ClassLoaderData* _next; /// Next loader_datas created
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126
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127 // ReadOnly and ReadWrite metaspaces (static because only on the null
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128 // class loader for now).
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129 static Metaspace* _ro_metaspace;
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130 static Metaspace* _rw_metaspace;
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131
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132 bool has_dependency(ClassLoaderData* cld);
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133 void add_dependency(ClassLoaderData* to_loader_data, TRAPS);
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134
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135 void set_next(ClassLoaderData* next) { _next = next; }
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136 ClassLoaderData* next() const { return _next; }
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137
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138 ClassLoaderData(Handle h_class_loader);
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139 ~ClassLoaderData();
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140
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141 void set_metaspace(Metaspace* m) { _metaspace = m; }
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142
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143 JNIHandleBlock* handles() const;
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144 void set_handles(JNIHandleBlock* handles);
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145
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146 Mutex* metaspace_lock() const { return _metaspace_lock; }
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147
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148 // GC interface.
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149 void clear_claimed() { _claimed = 0; }
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150 bool claimed() const { return _claimed == 1; }
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151 bool claim();
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152
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153 void mark_for_unload() { _unloading = true; }
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154
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155 void classes_do(void f(InstanceKlass*));
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156
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157 // Deallocate free list during class unloading.
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158 void free_deallocate_list();
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159
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160 // Allocate out of this class loader data
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161 MetaWord* allocate(size_t size);
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162
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163 public:
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164 // Accessors
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165 Metaspace* metaspace_or_null() const { return _metaspace; }
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166
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167 static ClassLoaderData* the_null_class_loader_data() {
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168 return _the_null_class_loader_data;
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169 }
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170
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171 static void init_null_class_loader_data() {
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172 assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
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173 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
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174 _the_null_class_loader_data = new ClassLoaderData((oop)NULL);
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175 ClassLoaderDataGraph::_head = _the_null_class_loader_data;
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176 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be");
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177 if (DumpSharedSpaces) {
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178 _the_null_class_loader_data->initialize_shared_metaspaces();
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179 }
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180 }
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181
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182 bool is_the_null_class_loader_data() const {
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183 return this == _the_null_class_loader_data;
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184 }
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185
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186 // The Metaspace is created lazily so may be NULL. This
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187 // method will allocate a Metaspace if needed.
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188 Metaspace* metaspace_non_null();
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189
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190 oop class_loader() const { return _class_loader; }
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191
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192 // Returns true if this class loader data is for a loader going away.
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193 bool is_unloading() const {
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194 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
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195 return _unloading;
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196 }
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197
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198 unsigned int identity_hash() {
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199 return _class_loader == NULL ? 0 : _class_loader->identity_hash();
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200 }
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201
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202 // Used when tracing from klasses.
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203 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
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204
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205 void classes_do(KlassClosure* klass_closure);
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206
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207 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
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208 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
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209
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210 void print_value() { print_value_on(tty); }
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211 void print_value_on(outputStream* out) const PRODUCT_RETURN;
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212 void dump(outputStream * const out) PRODUCT_RETURN;
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213 void verify();
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214
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215 jobject add_handle(Handle h);
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216 void add_class(Klass* k);
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217 void remove_class(Klass* k);
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218 void record_dependency(Klass* to, TRAPS);
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219
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220 void add_to_deallocate_list(Metadata* m);
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221
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222 static ClassLoaderData* class_loader_data(oop loader);
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223 static void print_loader(ClassLoaderData *loader_data, outputStream *out);
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224
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225 // CDS support
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226 Metaspace* ro_metaspace();
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227 Metaspace* rw_metaspace();
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228 void initialize_shared_metaspaces();
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229 };
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230
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231 class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
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232 ClassLoaderData* _data;
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233 public:
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234 ClassLoaderDataGraphMetaspaceIterator();
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235 ~ClassLoaderDataGraphMetaspaceIterator();
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236 bool repeat() { return _data != NULL; }
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237 Metaspace* get_next() {
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238 assert(_data != NULL, "Should not be NULL in call to the iterator");
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239 Metaspace* result = _data->metaspace_or_null();
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240 _data = _data->next();
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241 // This result might be NULL for class loaders without metaspace
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242 // yet. It would be nice to return only non-null results but
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243 // there is no guarantee that there will be a non-null result
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244 // down the list so the caller is going to have to check.
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245 return result;
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246 }
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247 };
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248 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP