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annotate src/share/vm/classfile/loaderConstraints.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 da91efe96a93
children
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1 /*
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2 * Copyright (c) 2003, 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_LOADERCONSTRAINTS_HPP
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26 #define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
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27
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28 #include "classfile/dictionary.hpp"
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29 #include "classfile/placeholders.hpp"
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30 #include "utilities/hashtable.hpp"
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31
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32 class LoaderConstraintEntry;
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33 class Symbol;
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34
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35 class LoaderConstraintTable : public Hashtable<Klass*, mtClass> {
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36 friend class VMStructs;
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37 private:
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38
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39 enum Constants {
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40 _loader_constraint_size = 107, // number of entries in constraint table
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41 _nof_buckets = 1009 // number of buckets in hash table
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42 };
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43
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44 LoaderConstraintEntry** find_loader_constraint(Symbol* name,
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45 Handle loader);
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46
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47 public:
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48
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49 LoaderConstraintTable(int nof_buckets);
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50
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51 LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name,
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52 Klass* klass, int num_loaders,
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53 int max_loaders);
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54 void free_entry(LoaderConstraintEntry *entry);
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55
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56 LoaderConstraintEntry* bucket(int i) {
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57 return (LoaderConstraintEntry*)Hashtable<Klass*, mtClass>::bucket(i);
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58 }
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59
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60 LoaderConstraintEntry** bucket_addr(int i) {
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61 return (LoaderConstraintEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);
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62 }
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63
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64 // Enhanced Class Redefinition support
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65 void classes_do(KlassClosure* f);
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66
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67 // Check class loader constraints
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68 bool add_entry(Symbol* name, Klass* klass1, Handle loader1,
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69 Klass* klass2, Handle loader2);
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70
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71 // Note: The main entry point for this module is via SystemDictionary.
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72 // SystemDictionary::check_signature_loaders(Symbol* signature,
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73 // Handle loader1, Handle loader2,
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74 // bool is_method, TRAPS)
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75
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76 Klass* find_constrained_klass(Symbol* name, Handle loader);
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77
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78 // Class loader constraints
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79
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80 void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
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81 void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
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82 Klass* klass);
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83 void merge_loader_constraints(LoaderConstraintEntry** pp1,
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84 LoaderConstraintEntry** pp2, Klass* klass);
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85
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86 bool check_or_update(instanceKlassHandle k, Handle loader,
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87 Symbol* name);
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90 void purge_loader_constraints();
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91
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92 void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
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93 #ifndef PRODUCT
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94 void print();
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95 #endif
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96 };
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97
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98 class LoaderConstraintEntry : public HashtableEntry<Klass*, mtClass> {
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99 friend class VMStructs;
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100 private:
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101 Symbol* _name; // class name
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102 int _num_loaders;
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103 int _max_loaders;
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104 // Loader constraints enforce correct linking behavior.
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105 // Thus, it really operates on ClassLoaderData which represents linking domain,
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106 // not class loaders.
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107 ClassLoaderData** _loaders; // initiating loaders
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108
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109 public:
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110
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111 Klass* klass() { return literal(); }
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112 Klass** klass_addr() { return literal_addr(); }
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113 void set_klass(Klass* k) { set_literal(k); }
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114
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115 LoaderConstraintEntry* next() {
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116 return (LoaderConstraintEntry*)HashtableEntry<Klass*, mtClass>::next();
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117 }
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118
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119 LoaderConstraintEntry** next_addr() {
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120 return (LoaderConstraintEntry**)HashtableEntry<Klass*, mtClass>::next_addr();
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121 }
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122 void set_next(LoaderConstraintEntry* next) {
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123 HashtableEntry<Klass*, mtClass>::set_next(next);
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124 }
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125
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126 Symbol* name() { return _name; }
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127 void set_name(Symbol* name) {
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128 _name = name;
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129 if (name != NULL) name->increment_refcount();
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130 }
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132 int num_loaders() { return _num_loaders; }
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133 void set_num_loaders(int i) { _num_loaders = i; }
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134
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135 int max_loaders() { return _max_loaders; }
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136 void set_max_loaders(int i) { _max_loaders = i; }
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137
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138 ClassLoaderData** loaders() { return _loaders; }
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139 void set_loaders(ClassLoaderData** loaders) { _loaders = loaders; }
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140
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141 ClassLoaderData* loader_data(int i) { return _loaders[i]; }
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142 void set_loader_data(int i, ClassLoaderData* p) { _loaders[i] = p; }
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143 // convenience
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144 void set_loader(int i, oop p);
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145 };
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146
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147 #endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP