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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The VM class loader.
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26 #include <sys/stat.h>
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27
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28
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29 // Meta-index (optional, to be able to skip opening boot classpath jar files)
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30 class MetaIndex: public CHeapObj {
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31 private:
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32 char** _meta_package_names;
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33 int _num_meta_package_names;
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34 public:
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35 MetaIndex(char** meta_package_names, int num_meta_package_names);
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36 ~MetaIndex();
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37 bool may_contain(const char* class_name);
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38 };
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39
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40
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41 // Class path entry (directory or zip file)
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42
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43 class ClassPathEntry: public CHeapObj {
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44 private:
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45 ClassPathEntry* _next;
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46 public:
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47 // Next entry in class path
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48 ClassPathEntry* next() { return _next; }
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49 void set_next(ClassPathEntry* next) {
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50 // may have unlocked readers, so write atomically.
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51 OrderAccess::release_store_ptr(&_next, next);
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52 }
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53 virtual bool is_jar_file() = 0;
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54 virtual const char* name() = 0;
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55 virtual bool is_lazy();
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56 // Constructor
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57 ClassPathEntry();
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58 // Attempt to locate file_name through this class path entry.
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59 // Returns a class file parsing stream if successfull.
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60 virtual ClassFileStream* open_stream(const char* name) = 0;
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61 // Debugging
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62 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
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63 NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
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64 };
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65
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66
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67 class ClassPathDirEntry: public ClassPathEntry {
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68 private:
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69 char* _dir; // Name of directory
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70 public:
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71 bool is_jar_file() { return false; }
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72 const char* name() { return _dir; }
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73 ClassPathDirEntry(char* dir);
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74 ClassFileStream* open_stream(const char* name);
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75 // Debugging
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76 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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77 NOT_PRODUCT(bool is_rt_jar();)
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78 };
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79
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80
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81 // Type definitions for zip file and zip file entry
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82 typedef void* jzfile;
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83 typedef struct {
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84 char *name; /* entry name */
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85 jlong time; /* modification time */
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86 jlong size; /* size of uncompressed data */
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87 jlong csize; /* size of compressed data (zero if uncompressed) */
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88 jint crc; /* crc of uncompressed data */
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89 char *comment; /* optional zip file comment */
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90 jbyte *extra; /* optional extra data */
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91 jlong pos; /* position of LOC header (if negative) or data */
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92 } jzentry;
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93
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94
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95 class ClassPathZipEntry: public ClassPathEntry {
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96 private:
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97 jzfile* _zip; // The zip archive
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98 char* _zip_name; // Name of zip archive
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99 public:
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100 bool is_jar_file() { return true; }
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101 const char* name() { return _zip_name; }
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102 ClassPathZipEntry(jzfile* zip, const char* zip_name);
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103 ~ClassPathZipEntry();
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104 ClassFileStream* open_stream(const char* name);
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105 void contents_do(void f(const char* name, void* context), void* context);
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106 // Debugging
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107 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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108 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
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109 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
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110 NOT_PRODUCT(bool is_rt_jar();)
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111 NOT_PRODUCT(bool is_rt_jar12();)
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112 NOT_PRODUCT(bool is_rt_jar13();)
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113 };
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114
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115
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116 // For lazier loading of boot class path entries
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117 class LazyClassPathEntry: public ClassPathEntry {
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118 private:
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119 char* _path; // dir or file
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120 struct stat _st;
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121 MetaIndex* _meta_index;
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122 volatile ClassPathEntry* _resolved_entry;
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123 ClassPathEntry* resolve_entry();
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124 public:
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125 bool is_jar_file();
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126 const char* name() { return _path; }
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127 LazyClassPathEntry(char* path, struct stat st);
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128 ClassFileStream* open_stream(const char* name);
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129 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
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130 virtual bool is_lazy();
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131 // Debugging
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132 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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133 NOT_PRODUCT(bool is_rt_jar();)
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134 };
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135
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136 class PackageHashtable;
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137 class PackageInfo;
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138 class HashtableBucket;
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139
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140 class ClassLoader: AllStatic {
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141 public:
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142 enum SomeConstants {
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143 package_hash_table_size = 31 // Number of buckets
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144 };
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145 private:
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146 friend class LazyClassPathEntry;
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147
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148 // Performance counters
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149 static PerfCounter* _perf_accumulated_time;
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150 static PerfCounter* _perf_classes_inited;
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151 static PerfCounter* _perf_class_init_time;
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152 static PerfCounter* _perf_class_verify_time;
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153 static PerfCounter* _perf_classes_linked;
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154 static PerfCounter* _perf_class_link_time;
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155
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156 static PerfCounter* _sync_systemLoaderLockContentionRate;
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157 static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
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158 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
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159 static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
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160 static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
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161
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162 static PerfCounter* _unsafe_defineClassCallCounter;
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163 static PerfCounter* _isUnsyncloadClass;
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164 static PerfCounter* _load_instance_class_failCounter;
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165
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166 // First entry in linked list of ClassPathEntry instances
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167 static ClassPathEntry* _first_entry;
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168 // Last entry in linked list of ClassPathEntry instances
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169 static ClassPathEntry* _last_entry;
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170 // Hash table used to keep track of loaded packages
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171 static PackageHashtable* _package_hash_table;
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172 static const char* _shared_archive;
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173
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174 // Hash function
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175 static unsigned int hash(const char *s, int n);
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176 // Returns the package file name corresponding to the specified package
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177 // or class name, or null if not found.
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178 static PackageInfo* lookup_package(const char *pkgname);
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179 // Adds a new package entry for the specified class or package name and
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180 // corresponding directory or jar file name.
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181 static bool add_package(const char *pkgname, int classpath_index, TRAPS);
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182
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183 // Initialization
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184 static void setup_meta_index();
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185 static void setup_bootstrap_search_path();
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186 static void load_zip_library();
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187 static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
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188
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189 // Canonicalizes path names, so strcmp will work properly. This is mainly
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190 // to avoid confusing the zip library
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191 static bool get_canonical_path(char* orig, char* out, int len);
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192 public:
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193 // Used by the kernel jvm.
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194 static void update_class_path_entry_list(const char *path,
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195 bool check_for_duplicates);
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196 static void print_bootclasspath();
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197
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198 // Timing
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199 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
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200 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
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201 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
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202 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
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203 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
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204 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
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205
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206 // Record how often system loader lock object is contended
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207 static PerfCounter* sync_systemLoaderLockContentionRate() {
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208 return _sync_systemLoaderLockContentionRate;
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209 }
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210
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211 // Record how often non system loader lock object is contended
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212 static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
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213 return _sync_nonSystemLoaderLockContentionRate;
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214 }
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215
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216 // Record how many calls to JVM_FindLoadedClass w/o holding a lock
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217 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
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218 return _sync_JVMFindLoadedClassLockFreeCounter;
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219 }
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220
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221 // Record how many calls to JVM_DefineClass w/o holding a lock
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222 static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
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223 return _sync_JVMDefineClassLockFreeCounter;
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224 }
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225
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226 // Record how many calls to jni_DefineClass w/o holding a lock
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227 static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
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228 return _sync_JNIDefineClassLockFreeCounter;
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229 }
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230
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231 // Record how many calls to Unsafe_DefineClass
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232 static PerfCounter* unsafe_defineClassCallCounter() {
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233 return _unsafe_defineClassCallCounter;
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234 }
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235
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236 // Record how many times SystemDictionary::load_instance_class call
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237 // fails with linkageError when Unsyncloadclass flag is set.
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238 static PerfCounter* load_instance_class_failCounter() {
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239 return _load_instance_class_failCounter;
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240 }
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241
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242 // Load individual .class file
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243 static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
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244
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245 // If the specified package has been loaded by the system, then returns
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246 // the name of the directory or ZIP file that the package was loaded from.
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247 // Returns null if the package was not loaded.
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248 // Note: The specified name can either be the name of a class or package.
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249 // If a package name is specified, then it must be "/"-separator and also
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250 // end with a trailing "/".
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251 static oop get_system_package(const char* name, TRAPS);
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252
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253 // Returns an array of Java strings representing all of the currently
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254 // loaded system packages.
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255 // Note: The package names returned are "/"-separated and end with a
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256 // trailing "/".
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257 static objArrayOop get_system_packages(TRAPS);
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258
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259 // Initialization
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260 static void initialize();
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261 static void create_package_info_table();
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262 static void create_package_info_table(HashtableBucket *t, int length,
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263 int number_of_entries);
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264 static int compute_Object_vtable();
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265
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266 static ClassPathEntry* classpath_entry(int n) {
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267 ClassPathEntry* e = ClassLoader::_first_entry;
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268 while (--n >= 0) {
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269 assert(e != NULL, "Not that many classpath entries.");
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270 e = e->next();
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271 }
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272 return e;
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273 }
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274
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275 // Sharing dump and restore
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276 static void copy_package_info_buckets(char** top, char* end);
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277 static void copy_package_info_table(char** top, char* end);
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278
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279 // VM monitoring and management support
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280 static jlong classloader_time_ms();
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281 static jlong class_method_total_size();
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282 static jlong class_init_count();
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283 static jlong class_init_time_ms();
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284 static jlong class_verify_time_ms();
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285 static jlong class_link_count();
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286 static jlong class_link_time_ms();
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287
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288 // indicates if class path already contains a entry (exact match by name)
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289 static bool contains_entry(ClassPathEntry* entry);
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290
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291 // adds a class path list
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292 static void add_to_list(ClassPathEntry* new_entry);
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293
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294 // creates a class path zip entry (returns NULL if JAR file cannot be opened)
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295 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
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296
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297 // Debugging
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298 static void verify() PRODUCT_RETURN;
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299
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300 // Force compilation of all methods in all classes in bootstrap class path (stress test)
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301 #ifndef PRODUCT
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302 private:
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303 static int _compile_the_world_counter;
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304 public:
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305 static void compile_the_world();
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306 static void compile_the_world_in(char* name, Handle loader, TRAPS);
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307 static int compile_the_world_counter() { return _compile_the_world_counter; }
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308 #endif //PRODUCT
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309 };
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