1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   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  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderExt.hpp"
  30 #include "classfile/classLoaderData.inline.hpp"
  31 #include "classfile/javaClasses.hpp"
  32 #if INCLUDE_CDS
  33 #include "classfile/sharedPathsMiscInfo.hpp"
  34 #include "classfile/sharedClassUtil.hpp"
  35 #endif
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/vmSymbols.hpp"
  38 #include "compiler/compileBroker.hpp"
  39 #include "gc_interface/collectedHeap.inline.hpp"
  40 #include "interpreter/bytecodeStream.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "memory/allocation.inline.hpp"
  43 #include "memory/filemap.hpp"
  44 #include "memory/generation.hpp"
  45 #include "memory/oopFactory.hpp"
  46 #include "memory/universe.inline.hpp"
  47 #include "oops/instanceKlass.hpp"
  48 #include "oops/instanceRefKlass.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvm_misc.hpp"
  52 #include "runtime/arguments.hpp"
  53 #include "runtime/compilationPolicy.hpp"
  54 #include "runtime/fprofiler.hpp"
  55 #include "runtime/handles.hpp"
  56 #include "runtime/handles.inline.hpp"
  57 #include "runtime/init.hpp"
  58 #include "runtime/interfaceSupport.hpp"
  59 #include "runtime/java.hpp"
  60 #include "runtime/javaCalls.hpp"
  61 #include "runtime/os.hpp"
  62 #include "runtime/threadCritical.hpp"
  63 #include "runtime/timer.hpp"
  64 #include "services/management.hpp"
  65 #include "services/threadService.hpp"
  66 #include "utilities/events.hpp"
  67 #include "utilities/hashtable.hpp"
  68 #include "utilities/hashtable.inline.hpp"
  69 
  70 // Entry points in zip.dll for loading zip/jar file entries
  71 
  72 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  73 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  74 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  75 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  76 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  77 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  78 
  79 static ZipOpen_t         ZipOpen            = NULL;
  80 static ZipClose_t        ZipClose           = NULL;
  81 static FindEntry_t       FindEntry          = NULL;
  82 static ReadEntry_t       ReadEntry          = NULL;
  83 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  84 static GetNextEntry_t    GetNextEntry       = NULL;
  85 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  86 
  87 // Globals
  88 
  89 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
  90 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
  91 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
  92 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
  93 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
  94 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
  95 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
  96 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
  97 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
  98 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
  99 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 100 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 101 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 102 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 103 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 104 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 105 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 106 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 107 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 108 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 109 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 110 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 111 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 112 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 113 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 114 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 115 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 116 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 117 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 118 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 119 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 120 
 121 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 122 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 123 int             ClassLoader::_num_entries         = 0;
 124 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 125 
 126 #if INCLUDE_CDS
 127 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 128 #endif
 129 // helper routines
 130 bool string_starts_with(const char* str, const char* str_to_find) {
 131   size_t str_len = strlen(str);
 132   size_t str_to_find_len = strlen(str_to_find);
 133   if (str_to_find_len > str_len) {
 134     return false;
 135   }
 136   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 137 }
 138 
 139 bool string_ends_with(const char* str, const char* str_to_find) {
 140   size_t str_len = strlen(str);
 141   size_t str_to_find_len = strlen(str_to_find);
 142   if (str_to_find_len > str_len) {
 143     return false;
 144   }
 145   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 146 }
 147 
 148 
 149 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
 150   if (num_meta_package_names == 0) {
 151     _meta_package_names = NULL;
 152     _num_meta_package_names = 0;
 153   } else {
 154     _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
 155     _num_meta_package_names = num_meta_package_names;
 156     memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
 157   }
 158 }
 159 
 160 
 161 MetaIndex::~MetaIndex() {
 162   FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
 163 }
 164 
 165 
 166 bool MetaIndex::may_contain(const char* class_name) {
 167   if ( _num_meta_package_names == 0) {
 168     return false;
 169   }
 170   size_t class_name_len = strlen(class_name);
 171   for (int i = 0; i < _num_meta_package_names; i++) {
 172     char* pkg = _meta_package_names[i];
 173     size_t pkg_len = strlen(pkg);
 174     size_t min_len = MIN2(class_name_len, pkg_len);
 175     if (!strncmp(class_name, pkg, min_len)) {
 176       return true;
 177     }
 178   }
 179   return false;
 180 }
 181 
 182 
 183 ClassPathEntry::ClassPathEntry() {
 184   set_next(NULL);
 185 }
 186 
 187 
 188 bool ClassPathEntry::is_lazy() {
 189   return false;
 190 }
 191 
 192 ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
 193   _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 194   strcpy(_dir, dir);
 195 }
 196 
 197 
 198 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 199   // construct full path name
 200   char path[JVM_MAXPATHLEN];
 201   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 202     return NULL;
 203   }
 204   // check if file exists
 205   struct stat st;
 206   if (os::stat(path, &st) == 0) {
 207 #if INCLUDE_CDS
 208     if (DumpSharedSpaces) {
 209       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 210       // we should never find a file underneath it -- unless user has added a new file while we are running
 211       // the dump, in which case let's quit!
 212       ShouldNotReachHere();
 213     }
 214 #endif
 215     // found file, open it
 216     int file_handle = os::open(path, 0, 0);
 217     if (file_handle != -1) {
 218       // read contents into resource array
 219       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 220       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 221       // close file
 222       os::close(file_handle);
 223       // construct ClassFileStream
 224       if (num_read == (size_t)st.st_size) {
 225         if (UsePerfData) {
 226           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 227         }
 228         return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
 229       }
 230     }
 231   }
 232   return NULL;
 233 }
 234 
 235 
 236 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
 237   _zip = zip;
 238   _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 239   strcpy(_zip_name, zip_name);
 240 }
 241 
 242 ClassPathZipEntry::~ClassPathZipEntry() {
 243   if (ZipClose != NULL) {
 244     (*ZipClose)(_zip);
 245   }
 246   FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
 247 }
 248 
 249 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 250     // enable call to C land
 251   JavaThread* thread = JavaThread::current();
 252   ThreadToNativeFromVM ttn(thread);
 253   // check whether zip archive contains name
 254   jint name_len;
 255   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 256   if (entry == NULL) return NULL;
 257   u1* buffer;
 258   char name_buf[128];
 259   char* filename;
 260   if (name_len < 128) {
 261     filename = name_buf;
 262   } else {
 263     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 264   }
 265 
 266   // file found, get pointer to the entry in mmapped jar file.
 267   if (ReadMappedEntry == NULL ||
 268       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 269       // mmapped access not available, perhaps due to compression,
 270       // read contents into resource array
 271       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 272       buffer = NEW_RESOURCE_ARRAY(u1, size);
 273       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 274   }
 275 
 276   // return result
 277   if (nul_terminate) {
 278     buffer[*filesize] = 0;
 279   }
 280   return buffer;
 281 }
 282 
 283 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 284   jint filesize;
 285   u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
 286   if (buffer == NULL) {
 287     return NULL;
 288   }
 289   if (UsePerfData) {
 290     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 291   }
 292   return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
 293 }
 294 
 295 // invoke function for each entry in the zip file
 296 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 297   JavaThread* thread = JavaThread::current();
 298   HandleMark  handle_mark(thread);
 299   ThreadToNativeFromVM ttn(thread);
 300   for (int n = 0; ; n++) {
 301     jzentry * ze = ((*GetNextEntry)(_zip, n));
 302     if (ze == NULL) break;
 303     (*f)(ze->name, context);
 304   }
 305 }
 306 
 307 LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
 308   _path = os::strdup_check_oom(path);
 309   _st = *st;
 310   _meta_index = NULL;
 311   _resolved_entry = NULL;
 312   _has_error = false;
 313   _throw_exception = throw_exception;
 314 }
 315 
 316 LazyClassPathEntry::~LazyClassPathEntry() {
 317   os::free(_path);
 318 }
 319 
 320 bool LazyClassPathEntry::is_jar_file() {
 321   return ((_st.st_mode & S_IFREG) == S_IFREG);
 322 }
 323 
 324 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
 325   if (_resolved_entry != NULL) {
 326     return (ClassPathEntry*) _resolved_entry;
 327   }
 328   ClassPathEntry* new_entry = NULL;
 329   new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
 330   if (!_throw_exception && new_entry == NULL) {
 331     assert(!HAS_PENDING_EXCEPTION, "must be");
 332     return NULL;
 333   }
 334   {
 335     ThreadCritical tc;
 336     if (_resolved_entry == NULL) {
 337       _resolved_entry = new_entry;
 338       return new_entry;
 339     }
 340   }
 341   assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
 342   delete new_entry;
 343   return (ClassPathEntry*) _resolved_entry;
 344 }
 345 
 346 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
 347   if (_meta_index != NULL &&
 348       !_meta_index->may_contain(name)) {
 349     return NULL;
 350   }
 351   if (_has_error) {
 352     return NULL;
 353   }
 354   ClassPathEntry* cpe = resolve_entry(THREAD);
 355   if (cpe == NULL) {
 356     _has_error = true;
 357     return NULL;
 358   } else {
 359     return cpe->open_stream(name, THREAD);
 360   }
 361 }
 362 
 363 bool LazyClassPathEntry::is_lazy() {
 364   return true;
 365 }
 366 
 367 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 368   if (_has_error) {
 369     return NULL;
 370   }
 371   ClassPathEntry* cpe = resolve_entry(THREAD);
 372   if (cpe == NULL) {
 373     _has_error = true;
 374     return NULL;
 375   } else if (cpe->is_jar_file()) {
 376     return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
 377   } else {
 378     ShouldNotReachHere();
 379     *filesize = 0;
 380     return NULL;
 381   }
 382 }
 383 
 384 static void print_meta_index(LazyClassPathEntry* entry,
 385                              GrowableArray<char*>& meta_packages) {
 386   tty->print("[Meta index for %s=", entry->name());
 387   for (int i = 0; i < meta_packages.length(); i++) {
 388     if (i > 0) tty->print(" ");
 389     tty->print("%s", meta_packages.at(i));
 390   }
 391   tty->print_cr("]");
 392 }
 393 
 394 #if INCLUDE_CDS
 395 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 396   assert(DumpSharedSpaces, "only called at dump time");
 397   tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
 398   vm_exit_during_initialization(error, message);
 399 }
 400 #endif
 401 
 402 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 403   if (!TraceClassPaths) {
 404     return;
 405   }
 406 
 407   if (msg) {
 408     tty->print("%s", msg);
 409   }
 410   if (name) {
 411     if (strlen(name) < 256) {
 412       tty->print("%s", name);
 413     } else {
 414       // For very long paths, we need to print each character separately,
 415       // as print_cr() has a length limit
 416       while (name[0] != '\0') {
 417         tty->print("%c", name[0]);
 418         name++;
 419       }
 420     }
 421   }
 422   if (msg && msg[0] == '[') {
 423     tty->print_cr("]");
 424   } else {
 425     tty->cr();
 426   }
 427 }
 428 
 429 void ClassLoader::setup_bootstrap_meta_index() {
 430   // Set up meta index which allows us to open boot jars lazily if
 431   // class data sharing is enabled
 432   const char* meta_index_path = Arguments::get_meta_index_path();
 433   const char* meta_index_dir  = Arguments::get_meta_index_dir();
 434   setup_meta_index(meta_index_path, meta_index_dir, 0);
 435 }
 436 
 437 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
 438   const char* known_version = "% VERSION 2";
 439   FILE* file = fopen(meta_index_path, "r");
 440   int line_no = 0;
 441 #if INCLUDE_CDS
 442   if (DumpSharedSpaces) {
 443     if (file != NULL) {
 444       _shared_paths_misc_info->add_required_file(meta_index_path);
 445     } else {
 446       _shared_paths_misc_info->add_nonexist_path(meta_index_path);
 447     }
 448   }
 449 #endif
 450   if (file != NULL) {
 451     ResourceMark rm;
 452     LazyClassPathEntry* cur_entry = NULL;
 453     GrowableArray<char*> boot_class_path_packages(10);
 454     char package_name[256];
 455     bool skipCurrentJar = false;
 456     while (fgets(package_name, sizeof(package_name), file) != NULL) {
 457       ++line_no;
 458       // Remove trailing newline
 459       package_name[strlen(package_name) - 1] = '\0';
 460       switch(package_name[0]) {
 461         case '%':
 462         {
 463           if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
 464             if (TraceClassLoading && Verbose) {
 465               tty->print("[Unsupported meta index version]");
 466             }
 467             fclose(file);
 468             return;
 469           }
 470         }
 471 
 472         // These directives indicate jar files which contain only
 473         // classes, only non-classfile resources, or a combination of
 474         // the two. See src/share/classes/sun/misc/MetaIndex.java and
 475         // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
 476         // workspace.
 477         case '#':
 478         case '!':
 479         case '@':
 480         {
 481           // Hand off current packages to current lazy entry (if any)
 482           if ((cur_entry != NULL) &&
 483               (boot_class_path_packages.length() > 0)) {
 484             if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 485               print_meta_index(cur_entry, boot_class_path_packages);
 486             }
 487             MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 488                                              boot_class_path_packages.length());
 489             cur_entry->set_meta_index(index);
 490           }
 491           cur_entry = NULL;
 492           boot_class_path_packages.clear();
 493 
 494           // Find lazy entry corresponding to this jar file
 495           int count = 0;
 496           for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
 497             if (count >= start_index &&
 498                 entry->is_lazy() &&
 499                 string_starts_with(entry->name(), meta_index_dir) &&
 500                 string_ends_with(entry->name(), &package_name[2])) {
 501               cur_entry = (LazyClassPathEntry*) entry;
 502               break;
 503             }
 504           }
 505 
 506           // If the first character is '@', it indicates the following jar
 507           // file is a resource only jar file in which case, we should skip
 508           // reading the subsequent entries since the resource loading is
 509           // totally handled by J2SE side.
 510           if (package_name[0] == '@') {
 511             if (cur_entry != NULL) {
 512               cur_entry->set_meta_index(new MetaIndex(NULL, 0));
 513             }
 514             cur_entry = NULL;
 515             skipCurrentJar = true;
 516           } else {
 517             skipCurrentJar = false;
 518           }
 519 
 520           break;
 521         }
 522 
 523         default:
 524         {
 525           if (!skipCurrentJar && cur_entry != NULL) {
 526             char* new_name = os::strdup_check_oom(package_name);
 527             boot_class_path_packages.append(new_name);
 528           }
 529         }
 530       }
 531     }
 532     // Hand off current packages to current lazy entry (if any)
 533     if ((cur_entry != NULL) &&
 534         (boot_class_path_packages.length() > 0)) {
 535       if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 536         print_meta_index(cur_entry, boot_class_path_packages);
 537       }
 538       MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 539                                        boot_class_path_packages.length());
 540       cur_entry->set_meta_index(index);
 541     }
 542     fclose(file);
 543   }
 544 }
 545 
 546 #if INCLUDE_CDS
 547 void ClassLoader::check_shared_classpath(const char *path) {
 548   if (strcmp(path, "") == 0) {
 549     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 550   }
 551 
 552   struct stat st;
 553   if (os::stat(path, &st) == 0) {
 554     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 555       if (!os::dir_is_empty(path)) {
 556         tty->print_cr("Error: non-empty directory '%s'", path);
 557         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 558       }
 559     }
 560   }
 561 }
 562 #endif
 563 
 564 void ClassLoader::setup_bootstrap_search_path() {
 565   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 566   char* sys_class_path = os::strdup_check_oom(Arguments::get_sysclasspath());
 567   if (!PrintSharedArchiveAndExit) {
 568     trace_class_path("[Bootstrap loader class path=", sys_class_path);
 569   }
 570 #if INCLUDE_CDS
 571   if (DumpSharedSpaces) {
 572     _shared_paths_misc_info->add_boot_classpath(Arguments::get_sysclasspath());
 573   }
 574 #endif
 575   setup_search_path(sys_class_path);
 576   os::free(sys_class_path);
 577 }
 578 
 579 #if INCLUDE_CDS
 580 int ClassLoader::get_shared_paths_misc_info_size() {
 581   return _shared_paths_misc_info->get_used_bytes();
 582 }
 583 
 584 void* ClassLoader::get_shared_paths_misc_info() {
 585   return _shared_paths_misc_info->buffer();
 586 }
 587 
 588 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 589   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 590   bool result = checker->check();
 591   delete checker;
 592   return result;
 593 }
 594 #endif
 595 
 596 void ClassLoader::setup_search_path(char *class_path) {
 597   int offset = 0;
 598   int len = (int)strlen(class_path);
 599   int end = 0;
 600 
 601   // Iterate over class path entries
 602   for (int start = 0; start < len; start = end) {
 603     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 604       end++;
 605     }
 606     EXCEPTION_MARK;
 607     ResourceMark rm(THREAD);
 608     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 609     strncpy(path, &class_path[start], end - start);
 610     path[end - start] = '\0';
 611     update_class_path_entry_list(path, false);
 612 #if INCLUDE_CDS
 613     if (DumpSharedSpaces) {
 614       check_shared_classpath(path);
 615     }
 616 #endif
 617     while (class_path[end] == os::path_separator()[0]) {
 618       end++;
 619     }
 620   }
 621 }
 622 
 623 ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st,
 624                                                      bool lazy, bool throw_exception, TRAPS) {
 625   JavaThread* thread = JavaThread::current();
 626   if (lazy) {
 627     return new LazyClassPathEntry(path, st, throw_exception);
 628   }
 629   ClassPathEntry* new_entry = NULL;
 630   if ((st->st_mode & S_IFREG) == S_IFREG) {
 631     // Regular file, should be a zip file
 632     // Canonicalized filename
 633     char canonical_path[JVM_MAXPATHLEN];
 634     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 635       // This matches the classic VM
 636       if (throw_exception) {
 637         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 638       } else {
 639         return NULL;
 640       }
 641     }
 642     char* error_msg = NULL;
 643     jzfile* zip;
 644     {
 645       // enable call to C land
 646       ThreadToNativeFromVM ttn(thread);
 647       HandleMark hm(thread);
 648       zip = (*ZipOpen)(canonical_path, &error_msg);
 649     }
 650     if (zip != NULL && error_msg == NULL) {
 651       new_entry = new ClassPathZipEntry(zip, path);
 652       if (TraceClassLoading || TraceClassPaths) {
 653         tty->print_cr("[Opened %s]", path);
 654       }
 655     } else {
 656       ResourceMark rm(thread);
 657       char *msg;
 658       if (error_msg == NULL) {
 659         msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 660         jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 661       } else {
 662         int len = (int)(strlen(path) + strlen(error_msg) + 128);
 663         msg = NEW_RESOURCE_ARRAY(char, len); ;
 664         jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 665       }
 666       if (throw_exception) {
 667         THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 668       } else {
 669         return NULL;
 670       }
 671     }
 672   } else {
 673     // Directory
 674     new_entry = new ClassPathDirEntry(path);
 675     if (TraceClassLoading || TraceClassPaths) {
 676       tty->print_cr("[Path %s]", path);
 677     }
 678   }
 679   return new_entry;
 680 }
 681 
 682 
 683 // Create a class path zip entry for a given path (return NULL if not found
 684 // or zip/JAR file cannot be opened)
 685 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
 686   // check for a regular file
 687   struct stat st;
 688   if (os::stat(path, &st) == 0) {
 689     if ((st.st_mode & S_IFREG) == S_IFREG) {
 690       char orig_path[JVM_MAXPATHLEN];
 691       char canonical_path[JVM_MAXPATHLEN];
 692 
 693       strcpy(orig_path, path);
 694       if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
 695         char* error_msg = NULL;
 696         jzfile* zip;
 697         {
 698           // enable call to C land
 699           JavaThread* thread = JavaThread::current();
 700           ThreadToNativeFromVM ttn(thread);
 701           HandleMark hm(thread);
 702           zip = (*ZipOpen)(canonical_path, &error_msg);
 703         }
 704         if (zip != NULL && error_msg == NULL) {
 705           // create using canonical path
 706           return new ClassPathZipEntry(zip, canonical_path);
 707         }
 708       }
 709     }
 710   }
 711   return NULL;
 712 }
 713 
 714 // returns true if entry already on class path
 715 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 716   ClassPathEntry* e = _first_entry;
 717   while (e != NULL) {
 718     // assume zip entries have been canonicalized
 719     if (strcmp(entry->name(), e->name()) == 0) {
 720       return true;
 721     }
 722     e = e->next();
 723   }
 724   return false;
 725 }
 726 
 727 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 728   if (new_entry != NULL) {
 729     if (_last_entry == NULL) {
 730       _first_entry = _last_entry = new_entry;
 731     } else {
 732       _last_entry->set_next(new_entry);
 733       _last_entry = new_entry;
 734     }
 735   }
 736   _num_entries ++;
 737 }
 738 
 739 // Returns true IFF the file/dir exists and the entry was successfully created.
 740 bool ClassLoader::update_class_path_entry_list(char *path,
 741                                                bool check_for_duplicates,
 742                                                bool throw_exception) {
 743   struct stat st;
 744   if (os::stat(path, &st) == 0) {
 745     // File or directory found
 746     ClassPathEntry* new_entry = NULL;
 747     Thread* THREAD = Thread::current();
 748     new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
 749     if (new_entry == NULL) {
 750       return false;
 751     }
 752     // The kernel VM adds dynamically to the end of the classloader path and
 753     // doesn't reorder the bootclasspath which would break java.lang.Package
 754     // (see PackageInfo).
 755     // Add new entry to linked list
 756     if (!check_for_duplicates || !contains_entry(new_entry)) {
 757       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
 758     }
 759     return true;
 760   } else {
 761 #if INCLUDE_CDS
 762     if (DumpSharedSpaces) {
 763       _shared_paths_misc_info->add_nonexist_path(path);
 764     }
 765     return false;
 766 #endif
 767   }
 768 }
 769 
 770 void ClassLoader::print_bootclasspath() {
 771   ClassPathEntry* e = _first_entry;
 772   tty->print("[bootclasspath= ");
 773   while (e != NULL) {
 774     tty->print("%s ;", e->name());
 775     e = e->next();
 776   }
 777   tty->print_cr("]");
 778 }
 779 
 780 void ClassLoader::load_zip_library() {
 781   assert(ZipOpen == NULL, "should not load zip library twice");
 782   // First make sure native library is loaded
 783   os::native_java_library();
 784   // Load zip library
 785   char path[JVM_MAXPATHLEN];
 786   char ebuf[1024];
 787   void* handle = NULL;
 788   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 789     handle = os::dll_load(path, ebuf, sizeof ebuf);
 790   }
 791   if (handle == NULL) {
 792     vm_exit_during_initialization("Unable to load ZIP library", path);
 793   }
 794   // Lookup zip entry points
 795   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 796   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 797   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 798   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 799   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 800   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 801 
 802   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 803   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL) {
 804     vm_exit_during_initialization("Corrupted ZIP library", path);
 805   }
 806 
 807   // Lookup canonicalize entry in libjava.dll
 808   void *javalib_handle = os::native_java_library();
 809   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 810   // This lookup only works on 1.3. Do not check for non-null here
 811 }
 812 
 813 // PackageInfo data exists in order to support the java.lang.Package
 814 // class.  A Package object provides information about a java package
 815 // (version, vendor, etc.) which originates in the manifest of the jar
 816 // file supplying the package.  For application classes, the ClassLoader
 817 // object takes care of this.
 818 
 819 // For system (boot) classes, the Java code in the Package class needs
 820 // to be able to identify which source jar file contained the boot
 821 // class, so that it can extract the manifest from it.  This table
 822 // identifies java packages with jar files in the boot classpath.
 823 
 824 // Because the boot classpath cannot change, the classpath index is
 825 // sufficient to identify the source jar file or directory.  (Since
 826 // directories have no manifests, the directory name is not required,
 827 // but is available.)
 828 
 829 // When using sharing -- the pathnames of entries in the boot classpath
 830 // may not be the same at runtime as they were when the archive was
 831 // created (NFS, Samba, etc.).  The actual files and directories named
 832 // in the classpath must be the same files, in the same order, even
 833 // though the exact name is not the same.
 834 
 835 class PackageInfo: public BasicHashtableEntry<mtClass> {
 836 public:
 837   const char* _pkgname;       // Package name
 838   int _classpath_index;       // Index of directory or JAR file loaded from
 839 
 840   PackageInfo* next() {
 841     return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
 842   }
 843 
 844   const char* pkgname()           { return _pkgname; }
 845   void set_pkgname(char* pkgname) { _pkgname = pkgname; }
 846 
 847   const char* filename() {
 848     return ClassLoader::classpath_entry(_classpath_index)->name();
 849   }
 850 
 851   void set_index(int index) {
 852     _classpath_index = index;
 853   }
 854 };
 855 
 856 
 857 class PackageHashtable : public BasicHashtable<mtClass> {
 858 private:
 859   inline unsigned int compute_hash(const char *s, int n) {
 860     unsigned int val = 0;
 861     while (--n >= 0) {
 862       val = *s++ + 31 * val;
 863     }
 864     return val;
 865   }
 866 
 867   PackageInfo* bucket(int index) {
 868     return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
 869   }
 870 
 871   PackageInfo* get_entry(int index, unsigned int hash,
 872                          const char* pkgname, size_t n) {
 873     for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
 874       if (pp->hash() == hash &&
 875           strncmp(pkgname, pp->pkgname(), n) == 0 &&
 876           pp->pkgname()[n] == '\0') {
 877         return pp;
 878       }
 879     }
 880     return NULL;
 881   }
 882 
 883 public:
 884   PackageHashtable(int table_size)
 885     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
 886 
 887   PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
 888     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
 889 
 890   PackageInfo* get_entry(const char* pkgname, int n) {
 891     unsigned int hash = compute_hash(pkgname, n);
 892     return get_entry(hash_to_index(hash), hash, pkgname, n);
 893   }
 894 
 895   PackageInfo* new_entry(char* pkgname, int n) {
 896     unsigned int hash = compute_hash(pkgname, n);
 897     PackageInfo* pp;
 898     pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
 899     pp->set_pkgname(pkgname);
 900     return pp;
 901   }
 902 
 903   void add_entry(PackageInfo* pp) {
 904     int index = hash_to_index(pp->hash());
 905     BasicHashtable<mtClass>::add_entry(index, pp);
 906   }
 907 
 908   void copy_pkgnames(const char** packages) {
 909     int n = 0;
 910     for (int i = 0; i < table_size(); ++i) {
 911       for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
 912         packages[n++] = pp->pkgname();
 913       }
 914     }
 915     assert(n == number_of_entries(), "just checking");
 916   }
 917 
 918   CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
 919 };
 920 
 921 #if INCLUDE_CDS
 922 void PackageHashtable::copy_table(char** top, char* end,
 923                                   PackageHashtable* table) {
 924   // Copy (relocate) the table to the shared space.
 925   BasicHashtable<mtClass>::copy_table(top, end);
 926 
 927   // Calculate the space needed for the package name strings.
 928   int i;
 929   intptr_t* tableSize = (intptr_t*)(*top);
 930   *top += sizeof(intptr_t);  // For table size
 931   char* tableStart = *top;
 932 
 933   for (i = 0; i < table_size(); ++i) {
 934     for (PackageInfo* pp = table->bucket(i);
 935                       pp != NULL;
 936                       pp = pp->next()) {
 937       int n1 = (int)(strlen(pp->pkgname()) + 1);
 938       if (*top + n1 >= end) {
 939         report_out_of_shared_space(SharedMiscData);
 940       }
 941       pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
 942       *top += n1;
 943     }
 944   }
 945   *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
 946   if (*top >= end) {
 947     report_out_of_shared_space(SharedMiscData);
 948   }
 949 
 950   // Write table size
 951   intptr_t len = *top - (char*)tableStart;
 952   *tableSize = len;
 953 }
 954 
 955 
 956 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
 957   _package_hash_table->copy_buckets(top, end);
 958 }
 959 
 960 void ClassLoader::copy_package_info_table(char** top, char* end) {
 961   _package_hash_table->copy_table(top, end, _package_hash_table);
 962 }
 963 #endif
 964 
 965 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
 966   const char *cp = strrchr(pkgname, '/');
 967   if (cp != NULL) {
 968     // Package prefix found
 969     int n = cp - pkgname + 1;
 970     return _package_hash_table->get_entry(pkgname, n);
 971   }
 972   return NULL;
 973 }
 974 
 975 
 976 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
 977   assert(pkgname != NULL, "just checking");
 978   // Bootstrap loader no longer holds system loader lock obj serializing
 979   // load_instance_class and thereby add_package
 980   {
 981     MutexLocker ml(PackageTable_lock, THREAD);
 982     // First check for previously loaded entry
 983     PackageInfo* pp = lookup_package(pkgname);
 984     if (pp != NULL) {
 985       // Existing entry found, check source of package
 986       pp->set_index(classpath_index);
 987       return true;
 988     }
 989 
 990     const char *cp = strrchr(pkgname, '/');
 991     if (cp != NULL) {
 992       // Package prefix found
 993       int n = cp - pkgname + 1;
 994 
 995       char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
 996       if (new_pkgname == NULL) {
 997         return false;
 998       }
 999 
1000       memcpy(new_pkgname, pkgname, n);
1001       new_pkgname[n] = '\0';
1002       pp = _package_hash_table->new_entry(new_pkgname, n);
1003       pp->set_index(classpath_index);
1004 
1005       // Insert into hash table
1006       _package_hash_table->add_entry(pp);
1007     }
1008     return true;
1009   }
1010 }
1011 
1012 
1013 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1014   PackageInfo* pp;
1015   {
1016     MutexLocker ml(PackageTable_lock, THREAD);
1017     pp = lookup_package(name);
1018   }
1019   if (pp == NULL) {
1020     return NULL;
1021   } else {
1022     Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1023     return p();
1024   }
1025 }
1026 
1027 
1028 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1029   ResourceMark rm(THREAD);
1030   int nof_entries;
1031   const char** packages;
1032   {
1033     MutexLocker ml(PackageTable_lock, THREAD);
1034     // Allocate resource char* array containing package names
1035     nof_entries = _package_hash_table->number_of_entries();
1036     if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1037       return NULL;
1038     }
1039     _package_hash_table->copy_pkgnames(packages);
1040   }
1041   // Allocate objArray and fill with java.lang.String
1042   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1043                                            nof_entries, CHECK_0);
1044   objArrayHandle result(THREAD, r);
1045   for (int i = 0; i < nof_entries; i++) {
1046     Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1047     result->obj_at_put(i, str());
1048   }
1049 
1050   return result();
1051 }
1052 
1053 
1054 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1055   ResourceMark rm(THREAD);
1056   const char* class_name = h_name->as_C_string();
1057   EventMark m("loading class %s", class_name);
1058   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1059 
1060   stringStream st;
1061   // st.print() uses too much stack space while handling a StackOverflowError
1062   // st.print("%s.class", h_name->as_utf8());
1063   st.print_raw(h_name->as_utf8());
1064   st.print_raw(".class");
1065   const char* file_name = st.as_string();
1066   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1067 
1068   // Lookup stream for parsing .class file
1069   ClassFileStream* stream = NULL;
1070   int classpath_index = 0;
1071   ClassPathEntry* e = NULL;
1072   instanceKlassHandle h;
1073   {
1074     PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1075                                ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1076                                PerfClassTraceTime::CLASS_LOAD);
1077     e = _first_entry;
1078     while (e != NULL) {
1079       stream = e->open_stream(file_name, CHECK_NULL);
1080       if (!context.check(stream, classpath_index)) {
1081         return h; // NULL
1082       }
1083       if (stream != NULL) {
1084         break;
1085       }
1086       e = e->next();
1087       ++classpath_index;
1088     }
1089   }
1090 
1091   if (stream != NULL) {
1092     // class file found, parse it
1093     ClassFileParser parser(stream);
1094     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1095     Handle protection_domain;
1096     TempNewSymbol parsed_name = NULL;
1097     instanceKlassHandle result = parser.parseClassFile(h_name,
1098                                                        loader_data,
1099                                                        protection_domain,
1100                                                        parsed_name,
1101                                                        context.should_verify(classpath_index),
1102                                                        THREAD);
1103     if (HAS_PENDING_EXCEPTION) {
1104       ResourceMark rm;
1105       if (DumpSharedSpaces) {
1106         tty->print_cr("Preload Error: Failed to load %s", class_name);
1107       }
1108       return h;
1109     }
1110     h = context.record_result(classpath_index, e, result, THREAD);
1111   } else {
1112     if (DumpSharedSpaces) {
1113       tty->print_cr("Preload Error: Cannot find %s", class_name);
1114     }
1115   }
1116 
1117   return h;
1118 }
1119 
1120 
1121 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1122                                             int number_of_entries) {
1123   assert(_package_hash_table == NULL, "One package info table allowed.");
1124   assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1125          "bad shared package info size.");
1126   _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1127                                              number_of_entries);
1128 }
1129 
1130 
1131 void ClassLoader::create_package_info_table() {
1132     assert(_package_hash_table == NULL, "shouldn't have one yet");
1133     _package_hash_table = new PackageHashtable(package_hash_table_size);
1134 }
1135 
1136 
1137 // Initialize the class loader's access to methods in libzip.  Parse and
1138 // process the boot classpath into a list ClassPathEntry objects.  Once
1139 // this list has been created, it must not change order (see class PackageInfo)
1140 // it can be appended to and is by jvmti and the kernel vm.
1141 
1142 void ClassLoader::initialize() {
1143   assert(_package_hash_table == NULL, "should have been initialized by now.");
1144   EXCEPTION_MARK;
1145 
1146   if (UsePerfData) {
1147     // jvmstat performance counters
1148     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1149     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1150     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1151     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1152     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1153     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1154     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1155     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1156     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1157     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1158 
1159     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1160     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1161     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1162     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1163     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1164     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1165     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1166     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1167     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1168     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1169     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1170     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1171     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1172 
1173 
1174     // The following performance counters are added for measuring the impact
1175     // of the bug fix of 6365597. They are mainly focused on finding out
1176     // the behavior of system & user-defined classloader lock, whether
1177     // ClassLoader.loadClass/findClass is being called synchronized or not.
1178     // Also two additional counters are created to see whether 'UnsyncloadClass'
1179     // flag is being set or not and how many times load_instance_class call
1180     // fails with linkageError etc.
1181     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1182                         "systemLoaderLockContentionRate");
1183     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1184                         "nonSystemLoaderLockContentionRate");
1185     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1186                         "jvmFindLoadedClassNoLockCalls");
1187     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1188                         "jvmDefineClassNoLockCalls");
1189 
1190     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1191                         "jniDefineClassNoLockCalls");
1192 
1193     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1194                         "unsafeDefineClassCalls");
1195 
1196     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1197     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1198                         "loadInstanceClassFailRate");
1199 
1200     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1201     if (UnsyncloadClass) {
1202       _isUnsyncloadClass->inc();
1203     }
1204   }
1205 
1206   // lookup zip library entry points
1207   load_zip_library();
1208 #if INCLUDE_CDS
1209   // initialize search path
1210   if (DumpSharedSpaces) {
1211     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1212   }
1213 #endif
1214   setup_bootstrap_search_path();
1215   if (LazyBootClassLoader) {
1216     // set up meta index which makes boot classpath initialization lazier
1217     setup_bootstrap_meta_index();
1218   }
1219 }
1220 
1221 #if INCLUDE_CDS
1222 void ClassLoader::initialize_shared_path() {
1223   if (DumpSharedSpaces) {
1224     ClassLoaderExt::setup_search_paths();
1225     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1226   }
1227 }
1228 #endif
1229 
1230 jlong ClassLoader::classloader_time_ms() {
1231   return UsePerfData ?
1232     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1233 }
1234 
1235 jlong ClassLoader::class_init_count() {
1236   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1237 }
1238 
1239 jlong ClassLoader::class_init_time_ms() {
1240   return UsePerfData ?
1241     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1242 }
1243 
1244 jlong ClassLoader::class_verify_time_ms() {
1245   return UsePerfData ?
1246     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1247 }
1248 
1249 jlong ClassLoader::class_link_count() {
1250   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1251 }
1252 
1253 jlong ClassLoader::class_link_time_ms() {
1254   return UsePerfData ?
1255     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1256 }
1257 
1258 int ClassLoader::compute_Object_vtable() {
1259   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1260   // code to determine actual value from file
1261   // Would be value '11' if finals were in vtable
1262   int JDK_1_2_Object_vtable_size = 5;
1263   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1264 }
1265 
1266 
1267 void classLoader_init() {
1268   ClassLoader::initialize();
1269 }
1270 
1271 
1272 bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
1273   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1274   if (CanonicalizeEntry != NULL) {
1275     JNIEnv* env = JavaThread::current()->jni_environment();
1276     if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) {
1277       return false;
1278     }
1279   } else {
1280     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1281     strncpy(out, orig, len);
1282     out[len - 1] = '\0';
1283   }
1284   return true;
1285 }
1286 
1287 #ifndef PRODUCT
1288 
1289 void ClassLoader::verify() {
1290   _package_hash_table->verify();
1291 }
1292 
1293 
1294 // CompileTheWorld
1295 //
1296 // Iterates over all class path entries and forces compilation of all methods
1297 // in all classes found. Currently, only zip/jar archives are searched.
1298 //
1299 // The classes are loaded by the Java level bootstrap class loader, and the
1300 // initializer is called. If DelayCompilationDuringStartup is true (default),
1301 // the interpreter will run the initialization code. Note that forcing
1302 // initialization in this way could potentially lead to initialization order
1303 // problems, in which case we could just force the initialization bit to be set.
1304 
1305 
1306 // We need to iterate over the contents of a zip/jar file, so we replicate the
1307 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1308 // since jzfile already has a void* definition.
1309 //
1310 // Note that this is only used in debug mode.
1311 //
1312 // HotSpot integration note:
1313 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1314 
1315 
1316 // JDK 1.3 version
1317 typedef struct real_jzentry {         /* Zip file entry */
1318     char *name;                 /* entry name */
1319     jint time;                  /* modification time */
1320     jint size;                  /* size of uncompressed data */
1321     jint csize;                 /* size of compressed data (zero if uncompressed) */
1322     jint crc;                   /* crc of uncompressed data */
1323     char *comment;              /* optional zip file comment */
1324     jbyte *extra;               /* optional extra data */
1325     jint pos;                   /* position of LOC header (if negative) or data */
1326 } real_jzentry;
1327 
1328 typedef struct real_jzfile {  /* Zip file */
1329     char *name;                 /* zip file name */
1330     jint refs;                  /* number of active references */
1331     jint fd;                    /* open file descriptor */
1332     void *lock;                 /* read lock */
1333     char *comment;              /* zip file comment */
1334     char *msg;                  /* zip error message */
1335     void *entries;              /* array of hash cells */
1336     jint total;                 /* total number of entries */
1337     unsigned short *table;      /* Hash chain heads: indexes into entries */
1338     jint tablelen;              /* number of hash eads */
1339     real_jzfile *next;        /* next zip file in search list */
1340     jzentry *cache;             /* we cache the most recently freed jzentry */
1341     /* Information on metadata names in META-INF directory */
1342     char **metanames;           /* array of meta names (may have null names) */
1343     jint metacount;             /* number of slots in metanames array */
1344     /* If there are any per-entry comments, they are in the comments array */
1345     char **comments;
1346 } real_jzfile;
1347 
1348 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1349   // For now we only compile all methods in all classes in zip/jar files
1350   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1351   tty->cr();
1352 }
1353 
1354 
1355 bool ClassPathDirEntry::is_rt_jar() {
1356   return false;
1357 }
1358 
1359 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1360   real_jzfile* zip = (real_jzfile*) _zip;
1361   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1362   tty->cr();
1363   // Iterate over all entries in zip file
1364   for (int n = 0; ; n++) {
1365     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1366     if (ze == NULL) break;
1367     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1368   }
1369   if (HAS_PENDING_EXCEPTION) {
1370     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1371       CLEAR_PENDING_EXCEPTION;
1372       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1373       tty->print_cr("Increase class metadata storage if a limit was set");
1374     } else {
1375       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1376     }
1377   }
1378 }
1379 
1380 bool ClassPathZipEntry::is_rt_jar() {
1381   real_jzfile* zip = (real_jzfile*) _zip;
1382   int len = (int)strlen(zip->name);
1383   // Check whether zip name ends in "rt.jar"
1384   // This will match other archives named rt.jar as well, but this is
1385   // only used for debugging.
1386   return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1387 }
1388 
1389 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1390   ClassPathEntry* cpe = resolve_entry(THREAD);
1391   if (cpe != NULL) {
1392     cpe->compile_the_world(loader, CHECK);
1393   }
1394 }
1395 
1396 bool LazyClassPathEntry::is_rt_jar() {
1397   Thread* THREAD = Thread::current();
1398   ClassPathEntry* cpe = resolve_entry(THREAD);
1399   return (cpe != NULL) ? cpe->is_jar_file() : false;
1400 }
1401 
1402 void ClassLoader::compile_the_world() {
1403   EXCEPTION_MARK;
1404   HandleMark hm(THREAD);
1405   ResourceMark rm(THREAD);
1406   // Make sure we don't run with background compilation
1407   BackgroundCompilation = false;
1408   // Find bootstrap loader
1409   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1410   // Iterate over all bootstrap class path entries
1411   ClassPathEntry* e = _first_entry;
1412   jlong start = os::javaTimeMillis();
1413   while (e != NULL) {
1414     // We stop at rt.jar, unless it is the first bootstrap path entry
1415     if (e->is_rt_jar() && e != _first_entry) break;
1416     e->compile_the_world(system_class_loader, CATCH);
1417     e = e->next();
1418   }
1419   jlong end = os::javaTimeMillis();
1420   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1421                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1422   {
1423     // Print statistics as if before normal exit:
1424     extern void print_statistics();
1425     print_statistics();
1426   }
1427   vm_exit(0);
1428 }
1429 
1430 int ClassLoader::_compile_the_world_class_counter = 0;
1431 int ClassLoader::_compile_the_world_method_counter = 0;
1432 static int _codecache_sweep_counter = 0;
1433 
1434 // Filter out all exceptions except OOMs
1435 static void clear_pending_exception_if_not_oom(TRAPS) {
1436   if (HAS_PENDING_EXCEPTION &&
1437       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1438     CLEAR_PENDING_EXCEPTION;
1439   }
1440   // The CHECK at the caller will propagate the exception out
1441 }
1442 
1443 /**
1444  * Returns if the given method should be compiled when doing compile-the-world.
1445  *
1446  * TODO:  This should be a private method in a CompileTheWorld class.
1447  */
1448 static bool can_be_compiled(methodHandle m, int comp_level) {
1449   assert(CompileTheWorld, "must be");
1450 
1451   // It's not valid to compile a native wrapper for MethodHandle methods
1452   // that take a MemberName appendix since the bytecode signature is not
1453   // correct.
1454   vmIntrinsics::ID iid = m->intrinsic_id();
1455   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1456     return false;
1457   }
1458 
1459   return CompilationPolicy::can_be_compiled(m, comp_level);
1460 }
1461 
1462 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1463   int len = (int)strlen(name);
1464   if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1465     // We have a .class file
1466     char buffer[2048];
1467     strncpy(buffer, name, len - 6);
1468     buffer[len-6] = 0;
1469     // If the file has a period after removing .class, it's not really a
1470     // valid class file.  The class loader will check everything else.
1471     if (strchr(buffer, '.') == NULL) {
1472       _compile_the_world_class_counter++;
1473       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1474 
1475       // Construct name without extension
1476       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1477       // Use loader to load and initialize class
1478       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1479       instanceKlassHandle k (THREAD, ik);
1480       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1481         k->initialize(THREAD);
1482       }
1483       bool exception_occurred = HAS_PENDING_EXCEPTION;
1484       clear_pending_exception_if_not_oom(CHECK);
1485       if (CompileTheWorldPreloadClasses && k.not_null()) {
1486         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1487         if (HAS_PENDING_EXCEPTION) {
1488           // If something went wrong in preloading we just ignore it
1489           clear_pending_exception_if_not_oom(CHECK);
1490           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1491         }
1492       }
1493 
1494       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1495         if (k.is_null() || exception_occurred) {
1496           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1497           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1498         } else {
1499           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1500           // Preload all classes to get around uncommon traps
1501           // Iterate over all methods in class
1502           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1503           for (int n = 0; n < k->methods()->length(); n++) {
1504             methodHandle m (THREAD, k->methods()->at(n));
1505             if (can_be_compiled(m, comp_level)) {
1506               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1507                 // Give sweeper a chance to keep up with CTW
1508                 VM_ForceSafepoint op;
1509                 VMThread::execute(&op);
1510                 _codecache_sweep_counter = 0;
1511               }
1512               // Force compilation
1513               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1514                                             methodHandle(), 0, "CTW", THREAD);
1515               if (HAS_PENDING_EXCEPTION) {
1516                 clear_pending_exception_if_not_oom(CHECK);
1517                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1518               } else {
1519                 _compile_the_world_method_counter++;
1520               }
1521               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1522                 // Clobber the first compile and force second tier compilation
1523                 nmethod* nm = m->code();
1524                 if (nm != NULL) {
1525                   // Throw out the code so that the code cache doesn't fill up
1526                   nm->make_not_entrant();
1527                   m->clear_code();
1528                 }
1529                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1530                                               methodHandle(), 0, "CTW", THREAD);
1531                 if (HAS_PENDING_EXCEPTION) {
1532                   clear_pending_exception_if_not_oom(CHECK);
1533                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1534                 } else {
1535                   _compile_the_world_method_counter++;
1536                 }
1537               }
1538             } else {
1539               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1540             }
1541 
1542             nmethod* nm = m->code();
1543             if (nm != NULL) {
1544               // Throw out the code so that the code cache doesn't fill up
1545               nm->make_not_entrant();
1546               m->clear_code();
1547             }
1548           }
1549         }
1550       }
1551     }
1552   }
1553 }
1554 
1555 #endif //PRODUCT
1556 
1557 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1558 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1559 void PerfClassTraceTime::initialize() {
1560   if (!UsePerfData) return;
1561 
1562   if (_eventp != NULL) {
1563     // increment the event counter
1564     _eventp->inc();
1565   }
1566 
1567   // stop the current active thread-local timer to measure inclusive time
1568   _prev_active_event = -1;
1569   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1570      if (_timers[i].is_active()) {
1571        assert(_prev_active_event == -1, "should have only one active timer");
1572        _prev_active_event = i;
1573        _timers[i].stop();
1574      }
1575   }
1576 
1577   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1578     // start the inclusive timer if not recursively called
1579     _t.start();
1580   }
1581 
1582   // start thread-local timer of the given event type
1583    if (!_timers[_event_type].is_active()) {
1584     _timers[_event_type].start();
1585   }
1586 }
1587 
1588 PerfClassTraceTime::~PerfClassTraceTime() {
1589   if (!UsePerfData) return;
1590 
1591   // stop the thread-local timer as the event completes
1592   // and resume the thread-local timer of the event next on the stack
1593   _timers[_event_type].stop();
1594   jlong selftime = _timers[_event_type].ticks();
1595 
1596   if (_prev_active_event >= 0) {
1597     _timers[_prev_active_event].start();
1598   }
1599 
1600   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1601 
1602   // increment the counters only on the leaf call
1603   _t.stop();
1604   _timep->inc(_t.ticks());
1605   if (_selftimep != NULL) {
1606     _selftimep->inc(selftime);
1607   }
1608   // add all class loading related event selftime to the accumulated time counter
1609   ClassLoader::perf_accumulated_time()->inc(selftime);
1610 
1611   // reset the timer
1612   _timers[_event_type].reset();
1613 }