annotate src/share/vm/classfile/classLoader.hpp @ 12355:cefad50507d8

Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents 43223d3f5dcd 7e7dd25666da
children eaf39a954227
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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26 #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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27
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28 #include "classfile/classFileParser.hpp"
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29 #include "runtime/perfData.hpp"
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30
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31 // The VM class loader.
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32 #include <sys/stat.h>
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33
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34
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35 // Meta-index (optional, to be able to skip opening boot classpath jar files)
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36 class MetaIndex: public CHeapObj<mtClass> {
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37 private:
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38 char** _meta_package_names;
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39 int _num_meta_package_names;
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40 public:
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41 MetaIndex(char** meta_package_names, int num_meta_package_names);
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42 ~MetaIndex();
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43 bool may_contain(const char* class_name);
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44 };
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45
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46
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47 // Class path entry (directory or zip file)
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48
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49 class ClassPathEntry: public CHeapObj<mtClass> {
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50 private:
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51 ClassPathEntry* _next;
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52 public:
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53 // Next entry in class path
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54 ClassPathEntry* next() { return _next; }
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55 void set_next(ClassPathEntry* next) {
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56 // may have unlocked readers, so write atomically.
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57 OrderAccess::release_store_ptr(&_next, next);
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58 }
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59 virtual bool is_jar_file() = 0;
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60 virtual const char* name() = 0;
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61 virtual bool is_lazy();
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62 // Constructor
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63 ClassPathEntry();
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64 // Attempt to locate file_name through this class path entry.
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65 // Returns a class file parsing stream if successfull.
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66 virtual ClassFileStream* open_stream(const char* name, TRAPS) = 0;
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67 // Debugging
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68 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
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69 NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
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70 };
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71
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72
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73 class ClassPathDirEntry: public ClassPathEntry {
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74 private:
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75 char* _dir; // Name of directory
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76 public:
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77 bool is_jar_file() { return false; }
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78 const char* name() { return _dir; }
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79 ClassPathDirEntry(char* dir);
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80 ClassFileStream* open_stream(const char* name, TRAPS);
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81 // Debugging
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82 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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83 NOT_PRODUCT(bool is_rt_jar();)
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84 };
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85
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86
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87 // Type definitions for zip file and zip file entry
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88 typedef void* jzfile;
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89 typedef struct {
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90 char *name; /* entry name */
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91 jlong time; /* modification time */
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92 jlong size; /* size of uncompressed data */
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93 jlong csize; /* size of compressed data (zero if uncompressed) */
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94 jint crc; /* crc of uncompressed data */
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95 char *comment; /* optional zip file comment */
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96 jbyte *extra; /* optional extra data */
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97 jlong pos; /* position of LOC header (if negative) or data */
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98 } jzentry;
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99
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100
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101 class ClassPathZipEntry: public ClassPathEntry {
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102 private:
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103 jzfile* _zip; // The zip archive
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104 char* _zip_name; // Name of zip archive
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105 public:
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106 bool is_jar_file() { return true; }
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107 const char* name() { return _zip_name; }
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108 ClassPathZipEntry(jzfile* zip, const char* zip_name);
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109 ~ClassPathZipEntry();
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110 ClassFileStream* open_stream(const char* name, TRAPS);
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111 void contents_do(void f(const char* name, void* context), void* context);
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112 // Debugging
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113 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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114 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
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115 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
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116 NOT_PRODUCT(bool is_rt_jar();)
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117 NOT_PRODUCT(bool is_rt_jar12();)
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118 NOT_PRODUCT(bool is_rt_jar13();)
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119 };
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120
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121
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122 // For lazier loading of boot class path entries
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123 class LazyClassPathEntry: public ClassPathEntry {
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124 private:
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125 char* _path; // dir or file
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126 struct stat _st;
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127 MetaIndex* _meta_index;
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128 bool _has_error;
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129 volatile ClassPathEntry* _resolved_entry;
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130 ClassPathEntry* resolve_entry(TRAPS);
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131 public:
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132 bool is_jar_file();
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133 const char* name() { return _path; }
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134 LazyClassPathEntry(char* path, const struct stat* st);
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135 ClassFileStream* open_stream(const char* name, TRAPS);
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136 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
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137 virtual bool is_lazy();
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138 // Debugging
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139 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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140 NOT_PRODUCT(bool is_rt_jar();)
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141 };
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142
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143 class PackageHashtable;
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144 class PackageInfo;
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145 template <MEMFLAGS F> class HashtableBucket;
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146
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147 class ClassLoader: AllStatic {
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148 public:
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149 enum SomeConstants {
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150 package_hash_table_size = 31 // Number of buckets
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151 };
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152 private:
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153 friend class LazyClassPathEntry;
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154
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155 // Performance counters
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156 static PerfCounter* _perf_accumulated_time;
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157 static PerfCounter* _perf_classes_inited;
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158 static PerfCounter* _perf_class_init_time;
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159 static PerfCounter* _perf_class_init_selftime;
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160 static PerfCounter* _perf_classes_verified;
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161 static PerfCounter* _perf_class_verify_time;
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162 static PerfCounter* _perf_class_verify_selftime;
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163 static PerfCounter* _perf_classes_linked;
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164 static PerfCounter* _perf_class_link_time;
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165 static PerfCounter* _perf_class_link_selftime;
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166 static PerfCounter* _perf_class_parse_time;
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167 static PerfCounter* _perf_class_parse_selftime;
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168 static PerfCounter* _perf_sys_class_lookup_time;
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169 static PerfCounter* _perf_shared_classload_time;
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170 static PerfCounter* _perf_sys_classload_time;
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171 static PerfCounter* _perf_app_classload_time;
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172 static PerfCounter* _perf_app_classload_selftime;
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173 static PerfCounter* _perf_app_classload_count;
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174 static PerfCounter* _perf_define_appclasses;
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175 static PerfCounter* _perf_define_appclass_time;
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176 static PerfCounter* _perf_define_appclass_selftime;
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177 static PerfCounter* _perf_app_classfile_bytes_read;
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178 static PerfCounter* _perf_sys_classfile_bytes_read;
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179
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180 static PerfCounter* _sync_systemLoaderLockContentionRate;
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181 static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
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182 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
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183 static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
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184 static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
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185
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186 static PerfCounter* _unsafe_defineClassCallCounter;
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187 static PerfCounter* _isUnsyncloadClass;
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188 static PerfCounter* _load_instance_class_failCounter;
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189
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190 // First entry in linked list of ClassPathEntry instances
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191 static ClassPathEntry* _first_entry;
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192 // Last entry in linked list of ClassPathEntry instances
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193 static ClassPathEntry* _last_entry;
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194 // Hash table used to keep track of loaded packages
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195 static PackageHashtable* _package_hash_table;
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196 static const char* _shared_archive;
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197
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198 // Hash function
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199 static unsigned int hash(const char *s, int n);
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200 // Returns the package file name corresponding to the specified package
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201 // or class name, or null if not found.
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202 static PackageInfo* lookup_package(const char *pkgname);
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203 // Adds a new package entry for the specified class or package name and
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204 // corresponding directory or jar file name.
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205 static bool add_package(const char *pkgname, int classpath_index, TRAPS);
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206
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207 // Initialization
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208 static void setup_meta_index();
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209 static void setup_bootstrap_search_path();
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210 static void load_zip_library();
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211 static ClassPathEntry* create_class_path_entry(char *path, const struct stat* st,
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212 bool lazy, TRAPS);
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213
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214 // Canonicalizes path names, so strcmp will work properly. This is mainly
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215 // to avoid confusing the zip library
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216 static bool get_canonical_path(char* orig, char* out, int len);
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217 public:
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218 // Used by the kernel jvm.
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219 static void update_class_path_entry_list(char *path,
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220 bool check_for_duplicates);
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221 static void print_bootclasspath();
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222
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223 // Timing
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224 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
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225 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
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226 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
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227 static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; }
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228 static PerfCounter* perf_classes_verified() { return _perf_classes_verified; }
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229 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
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230 static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; }
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231 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
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232 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
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233 static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; }
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234 static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; }
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235 static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; }
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236 static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; }
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237 static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; }
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238 static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; }
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239 static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; }
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240 static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; }
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241 static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; }
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242 static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; }
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243 static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; }
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244 static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
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245 static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
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246 static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
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247
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248 // Record how often system loader lock object is contended
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249 static PerfCounter* sync_systemLoaderLockContentionRate() {
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250 return _sync_systemLoaderLockContentionRate;
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251 }
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252
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253 // Record how often non system loader lock object is contended
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254 static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
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255 return _sync_nonSystemLoaderLockContentionRate;
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256 }
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257
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258 // Record how many calls to JVM_FindLoadedClass w/o holding a lock
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259 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
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260 return _sync_JVMFindLoadedClassLockFreeCounter;
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261 }
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262
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263 // Record how many calls to JVM_DefineClass w/o holding a lock
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264 static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
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265 return _sync_JVMDefineClassLockFreeCounter;
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266 }
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267
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268 // Record how many calls to jni_DefineClass w/o holding a lock
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269 static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
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270 return _sync_JNIDefineClassLockFreeCounter;
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271 }
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272
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273 // Record how many calls to Unsafe_DefineClass
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274 static PerfCounter* unsafe_defineClassCallCounter() {
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275 return _unsafe_defineClassCallCounter;
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276 }
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277
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278 // Record how many times SystemDictionary::load_instance_class call
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279 // fails with linkageError when Unsyncloadclass flag is set.
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280 static PerfCounter* load_instance_class_failCounter() {
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281 return _load_instance_class_failCounter;
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282 }
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283
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284 // Load individual .class file
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285 static instanceKlassHandle load_classfile(Symbol* h_name, TRAPS);
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286
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287 // If the specified package has been loaded by the system, then returns
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288 // the name of the directory or ZIP file that the package was loaded from.
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289 // Returns null if the package was not loaded.
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290 // Note: The specified name can either be the name of a class or package.
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291 // If a package name is specified, then it must be "/"-separator and also
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292 // end with a trailing "/".
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293 static oop get_system_package(const char* name, TRAPS);
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294
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295 // Returns an array of Java strings representing all of the currently
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296 // loaded system packages.
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297 // Note: The package names returned are "/"-separated and end with a
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298 // trailing "/".
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299 static objArrayOop get_system_packages(TRAPS);
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300
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301 // Initialization
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302 static void initialize();
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303 static void create_package_info_table();
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304 static void create_package_info_table(HashtableBucket<mtClass> *t, int length,
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305 int number_of_entries);
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306 static int compute_Object_vtable();
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307
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308 static ClassPathEntry* classpath_entry(int n) {
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309 ClassPathEntry* e = ClassLoader::_first_entry;
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310 while (--n >= 0) {
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311 assert(e != NULL, "Not that many classpath entries.");
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312 e = e->next();
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313 }
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314 return e;
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315 }
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316
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317 // Sharing dump and restore
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318 static void copy_package_info_buckets(char** top, char* end);
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319 static void copy_package_info_table(char** top, char* end);
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320
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321 // VM monitoring and management support
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322 static jlong classloader_time_ms();
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323 static jlong class_method_total_size();
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324 static jlong class_init_count();
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325 static jlong class_init_time_ms();
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326 static jlong class_verify_time_ms();
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327 static jlong class_link_count();
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328 static jlong class_link_time_ms();
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329
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330 // indicates if class path already contains a entry (exact match by name)
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331 static bool contains_entry(ClassPathEntry* entry);
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332
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333 // adds a class path list
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334 static void add_to_list(ClassPathEntry* new_entry);
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335
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336 // creates a class path zip entry (returns NULL if JAR file cannot be opened)
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337 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
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338
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339 // Debugging
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340 static void verify() PRODUCT_RETURN;
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341
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342 // Force compilation of all methods in all classes in bootstrap class path (stress test)
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343 #ifndef PRODUCT
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344 private:
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345 static int _compile_the_world_class_counter;
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346 static int _compile_the_world_method_counter;
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347 public:
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348 static void compile_the_world();
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349 static void compile_the_world_in(char* name, Handle loader, TRAPS);
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350 static int compile_the_world_counter() { return _compile_the_world_class_counter; }
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351 #endif //PRODUCT
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352 };
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353
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354 // PerfClassTraceTime is used to measure time for class loading related events.
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355 // This class tracks cumulative time and exclusive time for specific event types.
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356 // During the execution of one event, other event types (e.g. class loading and
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357 // resolution) as well as recursive calls of the same event type could happen.
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358 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
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359 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
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360 // instances have been created as multiple events are happening.
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361 class PerfClassTraceTime {
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362 public:
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363 enum {
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364 CLASS_LOAD = 0,
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365 PARSE_CLASS = 1,
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366 CLASS_LINK = 2,
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367 CLASS_VERIFY = 3,
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368 CLASS_CLINIT = 4,
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369 DEFINE_CLASS = 5,
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370 EVENT_TYPE_COUNT = 6
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371 };
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372 protected:
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373 // _t tracks time from initialization to destruction of this timer instance
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374 // including time for all other event types, and recursive calls of this type.
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375 // When a timer is called recursively, the elapsedTimer _t would not be used.
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376 elapsedTimer _t;
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377 PerfLongCounter* _timep;
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378 PerfLongCounter* _selftimep;
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379 PerfLongCounter* _eventp;
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380 // pointer to thread-local recursion counter and timer array
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381 // The thread_local timers track cumulative time for specific event types
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382 // exclusive of time for other event types, but including recursive calls
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383 // of the same type.
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384 int* _recursion_counters;
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385 elapsedTimer* _timers;
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386 int _event_type;
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387 int _prev_active_event;
875
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388
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389 public:
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390
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391 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
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392 PerfLongCounter* selftimep, /* counter incremented with exclusive time */
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393 PerfLongCounter* eventp, /* event counter */
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394 int* recursion_counters, /* thread-local recursion counter array */
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395 elapsedTimer* timers, /* thread-local timer array */
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396 int type /* event type */ ) :
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397 _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
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398 initialize();
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399 }
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400
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401 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
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402 elapsedTimer* timers, /* thread-local timer array */
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403 int type /* event type */ ) :
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404 _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
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405 initialize();
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406 }
875
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407
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408 inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
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409 inline void resume() { _t.start(); _timers[_event_type].start(); }
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410
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411 ~PerfClassTraceTime();
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412 void initialize();
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413 };
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414
1972
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415 #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP