Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoader.hpp @ 2139:75efcee5ac47
6966589: hs16-b08 causes java.lang.StackOverflowError
Reviewed-by: mchung, dholmes, chrisphi
| author | minqi |
|---|---|
| date | Thu, 07 Oct 2010 13:49:40 -0700 |
| parents | f95d63e2154a |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP |
| 26 #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP | |
| 27 | |
| 28 #include "classfile/classFileParser.hpp" | |
| 29 #include "runtime/perfData.hpp" | |
| 30 | |
| 0 | 31 // The VM class loader. |
| 32 #include <sys/stat.h> | |
| 33 | |
| 34 | |
| 35 // Meta-index (optional, to be able to skip opening boot classpath jar files) | |
| 36 class MetaIndex: public CHeapObj { | |
| 37 private: | |
| 38 char** _meta_package_names; | |
| 39 int _num_meta_package_names; | |
| 40 public: | |
| 41 MetaIndex(char** meta_package_names, int num_meta_package_names); | |
| 42 ~MetaIndex(); | |
| 43 bool may_contain(const char* class_name); | |
| 44 }; | |
| 45 | |
| 46 | |
| 47 // Class path entry (directory or zip file) | |
| 48 | |
| 49 class ClassPathEntry: public CHeapObj { | |
| 50 private: | |
| 51 ClassPathEntry* _next; | |
| 52 public: | |
| 53 // Next entry in class path | |
| 54 ClassPathEntry* next() { return _next; } | |
| 55 void set_next(ClassPathEntry* next) { | |
| 56 // may have unlocked readers, so write atomically. | |
| 57 OrderAccess::release_store_ptr(&_next, next); | |
| 58 } | |
| 59 virtual bool is_jar_file() = 0; | |
| 60 virtual const char* name() = 0; | |
| 61 virtual bool is_lazy(); | |
| 62 // Constructor | |
| 63 ClassPathEntry(); | |
| 64 // Attempt to locate file_name through this class path entry. | |
| 65 // Returns a class file parsing stream if successfull. | |
| 66 virtual ClassFileStream* open_stream(const char* name) = 0; | |
| 67 // Debugging | |
| 68 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;) | |
| 69 NOT_PRODUCT(virtual bool is_rt_jar() = 0;) | |
| 70 }; | |
| 71 | |
| 72 | |
| 73 class ClassPathDirEntry: public ClassPathEntry { | |
| 74 private: | |
| 75 char* _dir; // Name of directory | |
| 76 public: | |
| 77 bool is_jar_file() { return false; } | |
| 78 const char* name() { return _dir; } | |
| 79 ClassPathDirEntry(char* dir); | |
| 80 ClassFileStream* open_stream(const char* name); | |
| 81 // Debugging | |
| 82 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 83 NOT_PRODUCT(bool is_rt_jar();) | |
| 84 }; | |
| 85 | |
| 86 | |
| 87 // Type definitions for zip file and zip file entry | |
| 88 typedef void* jzfile; | |
| 89 typedef struct { | |
| 90 char *name; /* entry name */ | |
| 91 jlong time; /* modification time */ | |
| 92 jlong size; /* size of uncompressed data */ | |
| 93 jlong csize; /* size of compressed data (zero if uncompressed) */ | |
| 94 jint crc; /* crc of uncompressed data */ | |
| 95 char *comment; /* optional zip file comment */ | |
| 96 jbyte *extra; /* optional extra data */ | |
| 97 jlong pos; /* position of LOC header (if negative) or data */ | |
| 98 } jzentry; | |
| 99 | |
| 100 | |
| 101 class ClassPathZipEntry: public ClassPathEntry { | |
| 102 private: | |
| 103 jzfile* _zip; // The zip archive | |
| 104 char* _zip_name; // Name of zip archive | |
| 105 public: | |
| 106 bool is_jar_file() { return true; } | |
| 107 const char* name() { return _zip_name; } | |
| 108 ClassPathZipEntry(jzfile* zip, const char* zip_name); | |
| 109 ~ClassPathZipEntry(); | |
| 110 ClassFileStream* open_stream(const char* name); | |
| 111 void contents_do(void f(const char* name, void* context), void* context); | |
| 112 // Debugging | |
| 113 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 114 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version | |
| 115 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version | |
| 116 NOT_PRODUCT(bool is_rt_jar();) | |
| 117 NOT_PRODUCT(bool is_rt_jar12();) | |
| 118 NOT_PRODUCT(bool is_rt_jar13();) | |
| 119 }; | |
| 120 | |
| 121 | |
| 122 // For lazier loading of boot class path entries | |
| 123 class LazyClassPathEntry: public ClassPathEntry { | |
| 124 private: | |
| 125 char* _path; // dir or file | |
| 126 struct stat _st; | |
| 127 MetaIndex* _meta_index; | |
| 128 volatile ClassPathEntry* _resolved_entry; | |
| 129 ClassPathEntry* resolve_entry(); | |
| 130 public: | |
| 131 bool is_jar_file(); | |
| 132 const char* name() { return _path; } | |
| 133 LazyClassPathEntry(char* path, struct stat st); | |
| 134 ClassFileStream* open_stream(const char* name); | |
| 135 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; } | |
| 136 virtual bool is_lazy(); | |
| 137 // Debugging | |
| 138 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 139 NOT_PRODUCT(bool is_rt_jar();) | |
| 140 }; | |
| 141 | |
| 142 class PackageHashtable; | |
| 143 class PackageInfo; | |
| 144 class HashtableBucket; | |
| 145 | |
| 146 class ClassLoader: AllStatic { | |
| 147 public: | |
| 148 enum SomeConstants { | |
| 149 package_hash_table_size = 31 // Number of buckets | |
| 150 }; | |
| 151 private: | |
| 152 friend class LazyClassPathEntry; | |
| 153 | |
| 154 // Performance counters | |
| 155 static PerfCounter* _perf_accumulated_time; | |
| 156 static PerfCounter* _perf_classes_inited; | |
| 157 static PerfCounter* _perf_class_init_time; | |
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158 static PerfCounter* _perf_class_init_selftime; |
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159 static PerfCounter* _perf_classes_verified; |
| 0 | 160 static PerfCounter* _perf_class_verify_time; |
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161 static PerfCounter* _perf_class_verify_selftime; |
| 0 | 162 static PerfCounter* _perf_classes_linked; |
| 163 static PerfCounter* _perf_class_link_time; | |
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164 static PerfCounter* _perf_class_link_selftime; |
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165 static PerfCounter* _perf_class_parse_time; |
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166 static PerfCounter* _perf_class_parse_selftime; |
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167 static PerfCounter* _perf_sys_class_lookup_time; |
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168 static PerfCounter* _perf_shared_classload_time; |
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169 static PerfCounter* _perf_sys_classload_time; |
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170 static PerfCounter* _perf_app_classload_time; |
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171 static PerfCounter* _perf_app_classload_selftime; |
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172 static PerfCounter* _perf_app_classload_count; |
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173 static PerfCounter* _perf_define_appclasses; |
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174 static PerfCounter* _perf_define_appclass_time; |
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175 static PerfCounter* _perf_define_appclass_selftime; |
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176 static PerfCounter* _perf_app_classfile_bytes_read; |
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177 static PerfCounter* _perf_sys_classfile_bytes_read; |
| 0 | 178 |
| 179 static PerfCounter* _sync_systemLoaderLockContentionRate; | |
| 180 static PerfCounter* _sync_nonSystemLoaderLockContentionRate; | |
| 181 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter; | |
| 182 static PerfCounter* _sync_JVMDefineClassLockFreeCounter; | |
| 183 static PerfCounter* _sync_JNIDefineClassLockFreeCounter; | |
| 184 | |
| 185 static PerfCounter* _unsafe_defineClassCallCounter; | |
| 186 static PerfCounter* _isUnsyncloadClass; | |
| 187 static PerfCounter* _load_instance_class_failCounter; | |
| 188 | |
| 189 // First entry in linked list of ClassPathEntry instances | |
| 190 static ClassPathEntry* _first_entry; | |
| 191 // Last entry in linked list of ClassPathEntry instances | |
| 192 static ClassPathEntry* _last_entry; | |
| 193 // Hash table used to keep track of loaded packages | |
| 194 static PackageHashtable* _package_hash_table; | |
| 195 static const char* _shared_archive; | |
| 196 | |
| 197 // Hash function | |
| 198 static unsigned int hash(const char *s, int n); | |
| 199 // Returns the package file name corresponding to the specified package | |
| 200 // or class name, or null if not found. | |
| 201 static PackageInfo* lookup_package(const char *pkgname); | |
| 202 // Adds a new package entry for the specified class or package name and | |
| 203 // corresponding directory or jar file name. | |
| 204 static bool add_package(const char *pkgname, int classpath_index, TRAPS); | |
| 205 | |
| 206 // Initialization | |
| 207 static void setup_meta_index(); | |
| 208 static void setup_bootstrap_search_path(); | |
| 209 static void load_zip_library(); | |
| 210 static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy); | |
| 211 | |
| 212 // Canonicalizes path names, so strcmp will work properly. This is mainly | |
| 213 // to avoid confusing the zip library | |
| 214 static bool get_canonical_path(char* orig, char* out, int len); | |
| 215 public: | |
| 216 // Used by the kernel jvm. | |
| 217 static void update_class_path_entry_list(const char *path, | |
| 218 bool check_for_duplicates); | |
| 219 static void print_bootclasspath(); | |
| 220 | |
| 221 // Timing | |
|
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222 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; } |
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223 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; } |
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224 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; } |
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225 static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; } |
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226 static PerfCounter* perf_classes_verified() { return _perf_classes_verified; } |
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227 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; } |
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228 static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; } |
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229 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; } |
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230 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; } |
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231 static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; } |
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232 static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; } |
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233 static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; } |
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234 static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; } |
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235 static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; } |
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236 static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; } |
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237 static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; } |
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238 static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; } |
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239 static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; } |
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240 static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; } |
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241 static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; } |
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242 static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; } |
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243 static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; } |
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244 static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; } |
| 0 | 245 |
| 246 // Record how often system loader lock object is contended | |
| 247 static PerfCounter* sync_systemLoaderLockContentionRate() { | |
| 248 return _sync_systemLoaderLockContentionRate; | |
| 249 } | |
| 250 | |
| 251 // Record how often non system loader lock object is contended | |
| 252 static PerfCounter* sync_nonSystemLoaderLockContentionRate() { | |
| 253 return _sync_nonSystemLoaderLockContentionRate; | |
| 254 } | |
| 255 | |
| 256 // Record how many calls to JVM_FindLoadedClass w/o holding a lock | |
| 257 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() { | |
| 258 return _sync_JVMFindLoadedClassLockFreeCounter; | |
| 259 } | |
| 260 | |
| 261 // Record how many calls to JVM_DefineClass w/o holding a lock | |
| 262 static PerfCounter* sync_JVMDefineClassLockFreeCounter() { | |
| 263 return _sync_JVMDefineClassLockFreeCounter; | |
| 264 } | |
| 265 | |
| 266 // Record how many calls to jni_DefineClass w/o holding a lock | |
| 267 static PerfCounter* sync_JNIDefineClassLockFreeCounter() { | |
| 268 return _sync_JNIDefineClassLockFreeCounter; | |
| 269 } | |
| 270 | |
| 271 // Record how many calls to Unsafe_DefineClass | |
| 272 static PerfCounter* unsafe_defineClassCallCounter() { | |
| 273 return _unsafe_defineClassCallCounter; | |
| 274 } | |
| 275 | |
| 276 // Record how many times SystemDictionary::load_instance_class call | |
| 277 // fails with linkageError when Unsyncloadclass flag is set. | |
| 278 static PerfCounter* load_instance_class_failCounter() { | |
| 279 return _load_instance_class_failCounter; | |
| 280 } | |
| 281 | |
| 282 // Load individual .class file | |
| 283 static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS); | |
| 284 | |
| 285 // If the specified package has been loaded by the system, then returns | |
| 286 // the name of the directory or ZIP file that the package was loaded from. | |
| 287 // Returns null if the package was not loaded. | |
| 288 // Note: The specified name can either be the name of a class or package. | |
| 289 // If a package name is specified, then it must be "/"-separator and also | |
| 290 // end with a trailing "/". | |
| 291 static oop get_system_package(const char* name, TRAPS); | |
| 292 | |
| 293 // Returns an array of Java strings representing all of the currently | |
| 294 // loaded system packages. | |
| 295 // Note: The package names returned are "/"-separated and end with a | |
| 296 // trailing "/". | |
| 297 static objArrayOop get_system_packages(TRAPS); | |
| 298 | |
| 299 // Initialization | |
| 300 static void initialize(); | |
| 301 static void create_package_info_table(); | |
| 302 static void create_package_info_table(HashtableBucket *t, int length, | |
| 303 int number_of_entries); | |
| 304 static int compute_Object_vtable(); | |
| 305 | |
| 306 static ClassPathEntry* classpath_entry(int n) { | |
| 307 ClassPathEntry* e = ClassLoader::_first_entry; | |
| 308 while (--n >= 0) { | |
| 309 assert(e != NULL, "Not that many classpath entries."); | |
| 310 e = e->next(); | |
| 311 } | |
| 312 return e; | |
| 313 } | |
| 314 | |
| 315 // Sharing dump and restore | |
| 316 static void copy_package_info_buckets(char** top, char* end); | |
| 317 static void copy_package_info_table(char** top, char* end); | |
| 318 | |
| 319 // VM monitoring and management support | |
| 320 static jlong classloader_time_ms(); | |
| 321 static jlong class_method_total_size(); | |
| 322 static jlong class_init_count(); | |
| 323 static jlong class_init_time_ms(); | |
| 324 static jlong class_verify_time_ms(); | |
| 325 static jlong class_link_count(); | |
| 326 static jlong class_link_time_ms(); | |
| 327 | |
| 328 // indicates if class path already contains a entry (exact match by name) | |
| 329 static bool contains_entry(ClassPathEntry* entry); | |
| 330 | |
| 331 // adds a class path list | |
| 332 static void add_to_list(ClassPathEntry* new_entry); | |
| 333 | |
| 334 // creates a class path zip entry (returns NULL if JAR file cannot be opened) | |
| 335 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath); | |
| 336 | |
| 337 // Debugging | |
| 338 static void verify() PRODUCT_RETURN; | |
| 339 | |
| 340 // Force compilation of all methods in all classes in bootstrap class path (stress test) | |
| 341 #ifndef PRODUCT | |
| 342 private: | |
| 343 static int _compile_the_world_counter; | |
| 344 public: | |
| 345 static void compile_the_world(); | |
| 346 static void compile_the_world_in(char* name, Handle loader, TRAPS); | |
| 347 static int compile_the_world_counter() { return _compile_the_world_counter; } | |
| 348 #endif //PRODUCT | |
| 349 }; | |
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350 |
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351 // PerfClassTraceTime is used to measure time for class loading related events. |
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352 // This class tracks cumulative time and exclusive time for specific event types. |
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353 // During the execution of one event, other event types (e.g. class loading and |
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354 // resolution) as well as recursive calls of the same event type could happen. |
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355 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive) |
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356 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime |
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357 // instances have been created as multiple events are happening. |
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358 class PerfClassTraceTime { |
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359 public: |
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360 enum { |
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361 CLASS_LOAD = 0, |
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362 PARSE_CLASS = 1, |
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363 CLASS_LINK = 2, |
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364 CLASS_VERIFY = 3, |
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365 CLASS_CLINIT = 4, |
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366 DEFINE_CLASS = 5, |
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367 EVENT_TYPE_COUNT = 6 |
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368 }; |
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369 protected: |
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370 // _t tracks time from initialization to destruction of this timer instance |
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371 // including time for all other event types, and recursive calls of this type. |
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372 // When a timer is called recursively, the elapsedTimer _t would not be used. |
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373 elapsedTimer _t; |
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374 PerfLongCounter* _timep; |
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375 PerfLongCounter* _selftimep; |
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376 PerfLongCounter* _eventp; |
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377 // pointer to thread-local recursion counter and timer array |
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378 // The thread_local timers track cumulative time for specific event types |
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379 // exclusive of time for other event types, but including recursive calls |
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380 // of the same type. |
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381 int* _recursion_counters; |
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382 elapsedTimer* _timers; |
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383 int _event_type; |
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384 int _prev_active_event; |
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385 |
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386 public: |
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387 |
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388 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ |
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389 PerfLongCounter* selftimep, /* counter incremented with exclusive time */ |
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390 PerfLongCounter* eventp, /* event counter */ |
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391 int* recursion_counters, /* thread-local recursion counter array */ |
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392 elapsedTimer* timers, /* thread-local timer array */ |
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393 int type /* event type */ ) : |
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394 _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) { |
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395 initialize(); |
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396 } |
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397 |
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398 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ |
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399 elapsedTimer* timers, /* thread-local timer array */ |
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400 int type /* event type */ ) : |
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401 _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) { |
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402 initialize(); |
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403 } |
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404 |
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405 inline void suspend() { _t.stop(); _timers[_event_type].stop(); } |
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406 inline void resume() { _t.start(); _timers[_event_type].start(); } |
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407 |
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408 ~PerfClassTraceTime(); |
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409 void initialize(); |
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410 }; |
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411 |
| 1972 | 412 #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP |