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/imageFile.hpp"
  32 #include "classfile/javaClasses.hpp"
  33 #include "classfile/systemDictionary.hpp"
  34 #include "classfile/vmSymbols.hpp"
  35 #include "compiler/compileBroker.hpp"
  36 #include "gc_interface/collectedHeap.inline.hpp"
  37 #include "interpreter/bytecodeStream.hpp"
  38 #include "interpreter/oopMapCache.hpp"
  39 #include "memory/allocation.inline.hpp"
  40 #include "memory/filemap.hpp"
  41 #include "memory/generation.hpp"
  42 #include "memory/oopFactory.hpp"
  43 #include "memory/universe.inline.hpp"
  44 #include "oops/instanceKlass.hpp"
  45 #include "oops/instanceRefKlass.hpp"
  46 #include "oops/oop.inline.hpp"
  47 #include "oops/symbol.hpp"
  48 #include "prims/jvm_misc.hpp"
  49 #include "runtime/arguments.hpp"
  50 #include "runtime/compilationPolicy.hpp"
  51 #include "runtime/fprofiler.hpp"
  52 #include "runtime/handles.hpp"
  53 #include "runtime/handles.inline.hpp"
  54 #include "runtime/init.hpp"
  55 #include "runtime/interfaceSupport.hpp"
  56 #include "runtime/java.hpp"
  57 #include "runtime/javaCalls.hpp"
  58 #include "runtime/os.hpp"
  59 #include "runtime/threadCritical.hpp"
  60 #include "runtime/timer.hpp"
  61 #include "services/management.hpp"
  62 #include "services/threadService.hpp"
  63 #include "utilities/events.hpp"
  64 #include "utilities/hashtable.inline.hpp"
  65 #include "utilities/macros.hpp"
  66 #if INCLUDE_CDS
  67 #include "classfile/sharedPathsMiscInfo.hpp"
  68 #include "classfile/sharedClassUtil.hpp"
  69 #endif
  70 
  71 
  72 // Entry points in zip.dll for loading zip/jar file entries and image file entries
  73 
  74 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  75 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  76 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  77 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  78 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  79 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  80 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  81 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  82 
  83 static ZipOpen_t         ZipOpen            = NULL;
  84 static ZipClose_t        ZipClose           = NULL;
  85 static FindEntry_t       FindEntry          = NULL;
  86 static ReadEntry_t       ReadEntry          = NULL;
  87 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  88 static GetNextEntry_t    GetNextEntry       = NULL;
  89 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  90 static ZipInflateFully_t ZipInflateFully    = NULL;
  91 static Crc32_t           Crc32              = NULL;
  92 
  93 // Globals
  94 
  95 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
  96 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
  97 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
  98 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
  99 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 100 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 101 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 102 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 103 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 104 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 105 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 106 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 107 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 108 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 109 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 110 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 111 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 112 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 113 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 114 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 115 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 116 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 117 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 118 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 119 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 120 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 121 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 122 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 123 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 124 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 125 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 126 
 127 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 128 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 129 int             ClassLoader::_num_entries         = 0;
 130 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 131 
 132 #if INCLUDE_CDS
 133 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 134 #endif
 135 // helper routines
 136 bool string_starts_with(const char* str, const char* str_to_find) {
 137   size_t str_len = strlen(str);
 138   size_t str_to_find_len = strlen(str_to_find);
 139   if (str_to_find_len > str_len) {
 140     return false;
 141   }
 142   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 143 }
 144 
 145 bool string_ends_with(const char* str, const char* str_to_find) {
 146   size_t str_len = strlen(str);
 147   size_t str_to_find_len = strlen(str_to_find);
 148   if (str_to_find_len > str_len) {
 149     return false;
 150   }
 151   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 152 }
 153 
 154 
 155 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
 156   if (num_meta_package_names == 0) {
 157     _meta_package_names = NULL;
 158     _num_meta_package_names = 0;
 159   } else {
 160     _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
 161     _num_meta_package_names = num_meta_package_names;
 162     memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
 163   }
 164 }
 165 
 166 
 167 MetaIndex::~MetaIndex() {
 168   FREE_C_HEAP_ARRAY(char*, _meta_package_names);
 169 }
 170 
 171 
 172 bool MetaIndex::may_contain(const char* class_name) {
 173   if ( _num_meta_package_names == 0) {
 174     return false;
 175   }
 176   size_t class_name_len = strlen(class_name);
 177   for (int i = 0; i < _num_meta_package_names; i++) {
 178     char* pkg = _meta_package_names[i];
 179     size_t pkg_len = strlen(pkg);
 180     size_t min_len = MIN2(class_name_len, pkg_len);
 181     if (!strncmp(class_name, pkg, min_len)) {
 182       return true;
 183     }
 184   }
 185   return false;
 186 }
 187 
 188 
 189 ClassPathEntry::ClassPathEntry() {
 190   set_next(NULL);
 191 }
 192 
 193 
 194 bool ClassPathEntry::is_lazy() {
 195   return false;
 196 }
 197 
 198 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 199   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 200   strcpy(copy, dir);
 201   _dir = copy;
 202 }
 203 
 204 
 205 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 206   // construct full path name
 207   char path[JVM_MAXPATHLEN];
 208   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 209     return NULL;
 210   }
 211   // check if file exists
 212   struct stat st;
 213   if (os::stat(path, &st) == 0) {
 214 #if INCLUDE_CDS
 215     if (DumpSharedSpaces) {
 216       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 217       // we should never find a file underneath it -- unless user has added a new file while we are running
 218       // the dump, in which case let's quit!
 219       ShouldNotReachHere();
 220     }
 221 #endif
 222     // found file, open it
 223     int file_handle = os::open(path, 0, 0);
 224     if (file_handle != -1) {
 225       // read contents into resource array
 226       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 227       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 228       // close file
 229       os::close(file_handle);
 230       // construct ClassFileStream
 231       if (num_read == (size_t)st.st_size) {
 232         if (UsePerfData) {
 233           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 234         }
 235         return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
 236       }
 237     }
 238   }
 239   return NULL;
 240 }
 241 
 242 
 243 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
 244   _zip = zip;
 245   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 246   strcpy(copy, zip_name);
 247   _zip_name = copy;
 248 }
 249 
 250 ClassPathZipEntry::~ClassPathZipEntry() {
 251   if (ZipClose != NULL) {
 252     (*ZipClose)(_zip);
 253   }
 254   FREE_C_HEAP_ARRAY(char, _zip_name);
 255 }
 256 
 257 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 258     // enable call to C land
 259   JavaThread* thread = JavaThread::current();
 260   ThreadToNativeFromVM ttn(thread);
 261   // check whether zip archive contains name
 262   jint name_len;
 263   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 264   if (entry == NULL) return NULL;
 265   u1* buffer;
 266   char name_buf[128];
 267   char* filename;
 268   if (name_len < 128) {
 269     filename = name_buf;
 270   } else {
 271     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 272   }
 273 
 274   // file found, get pointer to the entry in mmapped jar file.
 275   if (ReadMappedEntry == NULL ||
 276       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 277       // mmapped access not available, perhaps due to compression,
 278       // read contents into resource array
 279       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 280       buffer = NEW_RESOURCE_ARRAY(u1, size);
 281       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 282   }
 283 
 284   // return result
 285   if (nul_terminate) {
 286     buffer[*filesize] = 0;
 287   }
 288   return buffer;
 289 }
 290 
 291 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 292   jint filesize;
 293   u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
 294   if (buffer == NULL) {
 295     return NULL;
 296   }
 297   if (UsePerfData) {
 298     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 299   }
 300   return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
 301 }
 302 
 303 // invoke function for each entry in the zip file
 304 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 305   JavaThread* thread = JavaThread::current();
 306   HandleMark  handle_mark(thread);
 307   ThreadToNativeFromVM ttn(thread);
 308   for (int n = 0; ; n++) {
 309     jzentry * ze = ((*GetNextEntry)(_zip, n));
 310     if (ze == NULL) break;
 311     (*f)(ze->name, context);
 312   }
 313 }
 314 
 315 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
 316   _path = os::strdup_check_oom(path);
 317   _st = *st;
 318   _meta_index = NULL;
 319   _resolved_entry = NULL;
 320   _has_error = false;
 321   _throw_exception = throw_exception;
 322 }
 323 
 324 LazyClassPathEntry::~LazyClassPathEntry() {
 325   os::free((void*)_path);
 326 }
 327 
 328 bool LazyClassPathEntry::is_jar_file() {
 329   size_t len = strlen(_path);
 330   if (len < 4 || strcmp(_path + len - 4, ".jar") != 0) return false;
 331   return ((_st.st_mode & S_IFREG) == S_IFREG);
 332 }
 333 
 334 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
 335   if (_resolved_entry != NULL) {
 336     return (ClassPathEntry*) _resolved_entry;
 337   }
 338   ClassPathEntry* new_entry = NULL;
 339   new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
 340   if (!_throw_exception && new_entry == NULL) {
 341     assert(!HAS_PENDING_EXCEPTION, "must be");
 342     return NULL;
 343   }
 344   {
 345     ThreadCritical tc;
 346     if (_resolved_entry == NULL) {
 347       _resolved_entry = new_entry;
 348       return new_entry;
 349     }
 350   }
 351   assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
 352   delete new_entry;
 353   return (ClassPathEntry*) _resolved_entry;
 354 }
 355 
 356 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
 357   if (_meta_index != NULL &&
 358       !_meta_index->may_contain(name)) {
 359     return NULL;
 360   }
 361   if (_has_error) {
 362     return NULL;
 363   }
 364   ClassPathEntry* cpe = resolve_entry(THREAD);
 365   if (cpe == NULL) {
 366     _has_error = true;
 367     return NULL;
 368   } else {
 369     return cpe->open_stream(name, THREAD);
 370   }
 371 }
 372 
 373 bool LazyClassPathEntry::is_lazy() {
 374   return true;
 375 }
 376 
 377 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 378   if (_has_error) {
 379     return NULL;
 380   }
 381   ClassPathEntry* cpe = resolve_entry(THREAD);
 382   if (cpe == NULL) {
 383     _has_error = true;
 384     return NULL;
 385   } else if (cpe->is_jar_file()) {
 386     return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
 387   } else {
 388     ShouldNotReachHere();
 389     *filesize = 0;
 390     return NULL;
 391   }
 392 }
 393 
 394 ClassPathImageEntry::ClassPathImageEntry(char* name) : ClassPathEntry(), _image(new ImageFile(name)) {
 395   bool opened = _image->open();
 396   if (!opened) {
 397     _image = NULL;
 398   }
 399 }
 400 
 401 ClassPathImageEntry::~ClassPathImageEntry() {
 402   if (_image) {
 403     _image->close();
 404     _image = NULL;
 405   }
 406 }
 407 
 408 const char* ClassPathImageEntry::name() {
 409   return _image ? _image->name() : "";
 410 }
 411 
 412 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 413   u1* buffer;
 414   u8 size;
 415   _image->get_resource(name, buffer, size);
 416 
 417   if (buffer) {
 418     if (UsePerfData) {
 419       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 420     }
 421     return new ClassFileStream(buffer, (int)size, (char*)name);  // Resource allocated
 422   }
 423 
 424   return NULL;
 425 }
 426 
 427 #ifndef PRODUCT
 428 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 429   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 430   tty->cr();
 431   const ImageStrings strings = _image->get_strings();
 432   // Retrieve each path component string.
 433   u4 count = _image->get_location_count();
 434   for (u4 i = 0; i < count; i++) {
 435     u1* location_data = _image->get_location_data(i);
 436 
 437     if (location_data) {
 438        ImageLocation location(location_data);
 439        const char* parent = location.get_attribute(ImageLocation::ATTRIBUTE_PARENT, strings);
 440        const char* base = location.get_attribute(ImageLocation::ATTRIBUTE_BASE, strings);
 441        const char* extension = location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION, strings);
 442        assert((strlen(parent) + strlen(base) + strlen(extension)) < JVM_MAXPATHLEN, "path exceeds buffer");
 443        char path[JVM_MAXPATHLEN];
 444        strcpy(path, parent);
 445        strcat(path, base);
 446        strcat(path, extension);
 447        ClassLoader::compile_the_world_in(path, loader, CHECK);
 448     }
 449   }
 450   if (HAS_PENDING_EXCEPTION) {
 451   if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 452     CLEAR_PENDING_EXCEPTION;
 453     tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 454     tty->print_cr("Increase class metadata storage if a limit was set");
 455   } else {
 456     tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 457   }
 458   }
 459 }
 460 
 461 bool ClassPathImageEntry::is_jrt() {
 462   return string_ends_with(name(), "bootmodules.jimage");
 463 }
 464 #endif
 465 
 466 static void print_meta_index(LazyClassPathEntry* entry,
 467                              GrowableArray<char*>& meta_packages) {
 468   tty->print("[Meta index for %s=", entry->name());
 469   for (int i = 0; i < meta_packages.length(); i++) {
 470     if (i > 0) tty->print(" ");
 471     tty->print("%s", meta_packages.at(i));
 472   }
 473   tty->print_cr("]");
 474 }
 475 
 476 #if INCLUDE_CDS
 477 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 478   assert(DumpSharedSpaces, "only called at dump time");
 479   tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
 480   vm_exit_during_initialization(error, message);
 481 }
 482 #endif
 483 
 484 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 485   if (!TraceClassPaths) {
 486     return;
 487   }
 488 
 489   if (msg) {
 490     tty->print("%s", msg);
 491   }
 492   if (name) {
 493     if (strlen(name) < 256) {
 494       tty->print("%s", name);
 495     } else {
 496       // For very long paths, we need to print each character separately,
 497       // as print_cr() has a length limit
 498       while (name[0] != '\0') {
 499         tty->print("%c", name[0]);
 500         name++;
 501       }
 502     }
 503   }
 504   if (msg && msg[0] == '[') {
 505     tty->print_cr("]");
 506   } else {
 507     tty->cr();
 508   }
 509 }
 510 
 511 void ClassLoader::setup_bootstrap_meta_index() {
 512   // Set up meta index which allows us to open boot jars lazily if
 513   // class data sharing is enabled
 514   const char* meta_index_path = Arguments::get_meta_index_path();
 515   const char* meta_index_dir  = Arguments::get_meta_index_dir();
 516   setup_meta_index(meta_index_path, meta_index_dir, 0);
 517 }
 518 
 519 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
 520   const char* known_version = "% VERSION 2";
 521   FILE* file = fopen(meta_index_path, "r");
 522   int line_no = 0;
 523 #if INCLUDE_CDS
 524   if (DumpSharedSpaces) {
 525     if (file != NULL) {
 526       _shared_paths_misc_info->add_required_file(meta_index_path);
 527     } else {
 528       _shared_paths_misc_info->add_nonexist_path(meta_index_path);
 529     }
 530   }
 531 #endif
 532   if (file != NULL) {
 533     ResourceMark rm;
 534     LazyClassPathEntry* cur_entry = NULL;
 535     GrowableArray<char*> boot_class_path_packages(10);
 536     char package_name[256];
 537     bool skipCurrentJar = false;
 538     while (fgets(package_name, sizeof(package_name), file) != NULL) {
 539       ++line_no;
 540       // Remove trailing newline
 541       package_name[strlen(package_name) - 1] = '\0';
 542       switch(package_name[0]) {
 543         case '%':
 544         {
 545           if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
 546             if (TraceClassLoading && Verbose) {
 547               tty->print("[Unsupported meta index version]");
 548             }
 549             fclose(file);
 550             return;
 551           }
 552         }
 553 
 554         // These directives indicate jar files which contain only
 555         // classes, only non-classfile resources, or a combination of
 556         // the two. See src/share/classes/sun/misc/MetaIndex.java and
 557         // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
 558         // workspace.
 559         case '#':
 560         case '!':
 561         case '@':
 562         {
 563           // Hand off current packages to current lazy entry (if any)
 564           if ((cur_entry != NULL) &&
 565               (boot_class_path_packages.length() > 0)) {
 566             if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 567               print_meta_index(cur_entry, boot_class_path_packages);
 568             }
 569             MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 570                                              boot_class_path_packages.length());
 571             cur_entry->set_meta_index(index);
 572           }
 573           cur_entry = NULL;
 574           boot_class_path_packages.clear();
 575 
 576           // Find lazy entry corresponding to this jar file
 577           int count = 0;
 578           for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
 579             if (count >= start_index &&
 580                 entry->is_lazy() &&
 581                 string_starts_with(entry->name(), meta_index_dir) &&
 582                 string_ends_with(entry->name(), &package_name[2])) {
 583               cur_entry = (LazyClassPathEntry*) entry;
 584               break;
 585             }
 586           }
 587 
 588           // If the first character is '@', it indicates the following jar
 589           // file is a resource only jar file in which case, we should skip
 590           // reading the subsequent entries since the resource loading is
 591           // totally handled by J2SE side.
 592           if (package_name[0] == '@') {
 593             if (cur_entry != NULL) {
 594               cur_entry->set_meta_index(new MetaIndex(NULL, 0));
 595             }
 596             cur_entry = NULL;
 597             skipCurrentJar = true;
 598           } else {
 599             skipCurrentJar = false;
 600           }
 601 
 602           break;
 603         }
 604 
 605         default:
 606         {
 607           if (!skipCurrentJar && cur_entry != NULL) {
 608             char* new_name = os::strdup_check_oom(package_name);
 609             boot_class_path_packages.append(new_name);
 610           }
 611         }
 612       }
 613     }
 614     // Hand off current packages to current lazy entry (if any)
 615     if ((cur_entry != NULL) &&
 616         (boot_class_path_packages.length() > 0)) {
 617       if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 618         print_meta_index(cur_entry, boot_class_path_packages);
 619       }
 620       MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 621                                        boot_class_path_packages.length());
 622       cur_entry->set_meta_index(index);
 623     }
 624     fclose(file);
 625   }
 626 }
 627 
 628 #if INCLUDE_CDS
 629 void ClassLoader::check_shared_classpath(const char *path) {
 630   if (strcmp(path, "") == 0) {
 631     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 632   }
 633 
 634   struct stat st;
 635   if (os::stat(path, &st) == 0) {
 636     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 637       if (!os::dir_is_empty(path)) {
 638         tty->print_cr("Error: non-empty directory '%s'", path);
 639         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 640       }
 641     }
 642   }
 643 }
 644 #endif
 645 
 646 void ClassLoader::setup_bootstrap_search_path() {
 647   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 648   const char* sys_class_path = Arguments::get_sysclasspath();
 649   if (PrintSharedArchiveAndExit) {
 650     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 651     // the same as the bootcp of the shared archive.
 652   } else {
 653     trace_class_path("[Bootstrap loader class path=", sys_class_path);
 654   }
 655 #if INCLUDE_CDS
 656   if (DumpSharedSpaces) {
 657     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 658   }
 659 #endif
 660   setup_search_path(sys_class_path);
 661 }
 662 
 663 #if INCLUDE_CDS
 664 int ClassLoader::get_shared_paths_misc_info_size() {
 665   return _shared_paths_misc_info->get_used_bytes();
 666 }
 667 
 668 void* ClassLoader::get_shared_paths_misc_info() {
 669   return _shared_paths_misc_info->buffer();
 670 }
 671 
 672 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 673   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 674   bool result = checker->check();
 675   delete checker;
 676   return result;
 677 }
 678 #endif
 679 
 680 void ClassLoader::setup_search_path(const char *class_path) {
 681   int offset = 0;
 682   int len = (int)strlen(class_path);
 683   int end = 0;
 684 
 685   // Iterate over class path entries
 686   for (int start = 0; start < len; start = end) {
 687     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 688       end++;
 689     }
 690     EXCEPTION_MARK;
 691     ResourceMark rm(THREAD);
 692     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 693     strncpy(path, &class_path[start], end - start);
 694     path[end - start] = '\0';
 695     update_class_path_entry_list(path, false);
 696 #if INCLUDE_CDS
 697     if (DumpSharedSpaces) {
 698       check_shared_classpath(path);
 699     }
 700 #endif
 701     while (class_path[end] == os::path_separator()[0]) {
 702       end++;
 703     }
 704   }
 705 }
 706 
 707 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 708                                                      bool lazy, bool throw_exception, TRAPS) {
 709   JavaThread* thread = JavaThread::current();
 710   if (lazy) {
 711     return new LazyClassPathEntry(path, st, throw_exception);
 712   }
 713   ClassPathEntry* new_entry = NULL;
 714   if ((st->st_mode & S_IFREG) == S_IFREG) {
 715     // Regular file, should be a zip or image file
 716     // Canonicalized filename
 717     char canonical_path[JVM_MAXPATHLEN];
 718     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 719       // This matches the classic VM
 720       if (throw_exception) {
 721         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 722       } else {
 723         return NULL;
 724       }
 725     }
 726     // TODO - add proper criteria for selecting image file
 727     ClassPathImageEntry* entry = new ClassPathImageEntry(canonical_path);
 728     if (entry->is_open()) {
 729       new_entry = entry;
 730     } else {
 731     char* error_msg = NULL;
 732     jzfile* zip;
 733     {
 734       // enable call to C land
 735       ThreadToNativeFromVM ttn(thread);
 736       HandleMark hm(thread);
 737       zip = (*ZipOpen)(canonical_path, &error_msg);
 738     }
 739     if (zip != NULL && error_msg == NULL) {
 740       new_entry = new ClassPathZipEntry(zip, path);
 741     } else {
 742       ResourceMark rm(thread);
 743       char *msg;
 744       if (error_msg == NULL) {
 745         msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 746         jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 747       } else {
 748         int len = (int)(strlen(path) + strlen(error_msg) + 128);
 749         msg = NEW_RESOURCE_ARRAY(char, len); ;
 750         jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 751       }
 752       if (throw_exception) {
 753         THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 754       } else {
 755         return NULL;
 756       }
 757     }
 758     }
 759     if (TraceClassLoading || TraceClassPaths) {
 760       tty->print_cr("[Opened %s]", path);
 761     }
 762   } else {
 763     // Directory
 764     new_entry = new ClassPathDirEntry(path);
 765     if (TraceClassLoading) {
 766       tty->print_cr("[Path %s]", path);
 767     }
 768   }
 769   return new_entry;
 770 }
 771 
 772 
 773 // Create a class path zip entry for a given path (return NULL if not found
 774 // or zip/JAR file cannot be opened)
 775 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
 776   // check for a regular file
 777   struct stat st;
 778   if (os::stat(path, &st) == 0) {
 779     if ((st.st_mode & S_IFREG) == S_IFREG) {
 780       char canonical_path[JVM_MAXPATHLEN];
 781       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 782         char* error_msg = NULL;
 783         jzfile* zip;
 784         {
 785           // enable call to C land
 786           JavaThread* thread = JavaThread::current();
 787           ThreadToNativeFromVM ttn(thread);
 788           HandleMark hm(thread);
 789           zip = (*ZipOpen)(canonical_path, &error_msg);
 790         }
 791         if (zip != NULL && error_msg == NULL) {
 792           // create using canonical path
 793           return new ClassPathZipEntry(zip, canonical_path);
 794         }
 795       }
 796     }
 797   }
 798   return NULL;
 799 }
 800 
 801 // returns true if entry already on class path
 802 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 803   ClassPathEntry* e = _first_entry;
 804   while (e != NULL) {
 805     // assume zip entries have been canonicalized
 806     if (strcmp(entry->name(), e->name()) == 0) {
 807       return true;
 808     }
 809     e = e->next();
 810   }
 811   return false;
 812 }
 813 
 814 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 815   if (new_entry != NULL) {
 816     if (_last_entry == NULL) {
 817       _first_entry = _last_entry = new_entry;
 818     } else {
 819       _last_entry->set_next(new_entry);
 820       _last_entry = new_entry;
 821     }
 822   }
 823   _num_entries ++;
 824 }
 825 
 826 // Returns true IFF the file/dir exists and the entry was successfully created.
 827 bool ClassLoader::update_class_path_entry_list(const char *path,
 828                                                bool check_for_duplicates,
 829                                                bool throw_exception) {
 830   struct stat st;
 831   if (os::stat(path, &st) == 0) {
 832     // File or directory found
 833     ClassPathEntry* new_entry = NULL;
 834     Thread* THREAD = Thread::current();
 835     new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
 836     if (new_entry == NULL) {
 837       return false;
 838     }
 839     // The kernel VM adds dynamically to the end of the classloader path and
 840     // doesn't reorder the bootclasspath which would break java.lang.Package
 841     // (see PackageInfo).
 842     // Add new entry to linked list
 843     if (!check_for_duplicates || !contains_entry(new_entry)) {
 844       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
 845     }
 846     return true;
 847   } else {
 848 #if INCLUDE_CDS
 849     if (DumpSharedSpaces) {
 850       _shared_paths_misc_info->add_nonexist_path(path);
 851     }
 852 #endif
 853     return false;
 854   }
 855 }
 856 
 857 void ClassLoader::print_bootclasspath() {
 858   ClassPathEntry* e = _first_entry;
 859   tty->print("[bootclasspath= ");
 860   while (e != NULL) {
 861     tty->print("%s ;", e->name());
 862     e = e->next();
 863   }
 864   tty->print_cr("]");
 865 }
 866 
 867 void ClassLoader::load_zip_library() {
 868   assert(ZipOpen == NULL, "should not load zip library twice");
 869   // First make sure native library is loaded
 870   os::native_java_library();
 871   // Load zip library
 872   char path[JVM_MAXPATHLEN];
 873   char ebuf[1024];
 874   void* handle = NULL;
 875   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 876     handle = os::dll_load(path, ebuf, sizeof ebuf);
 877   }
 878   if (handle == NULL) {
 879     vm_exit_during_initialization("Unable to load ZIP library", path);
 880   }
 881   // Lookup zip entry points
 882   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 883   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 884   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 885   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 886   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 887   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 888   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 889   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 890 
 891   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 892   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
 893       GetNextEntry == NULL || Crc32 == NULL) {
 894     vm_exit_during_initialization("Corrupted ZIP library", path);
 895   }
 896 
 897   if (ZipInflateFully == NULL) {
 898     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
 899   }
 900 
 901   // Lookup canonicalize entry in libjava.dll
 902   void *javalib_handle = os::native_java_library();
 903   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 904   // This lookup only works on 1.3. Do not check for non-null here
 905 }
 906 
 907 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
 908   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
 909 }
 910 
 911 int ClassLoader::crc32(int crc, const char* buf, int len) {
 912   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
 913   return (*Crc32)(crc, (const jbyte*)buf, len);
 914 }
 915 
 916 // PackageInfo data exists in order to support the java.lang.Package
 917 // class.  A Package object provides information about a java package
 918 // (version, vendor, etc.) which originates in the manifest of the jar
 919 // file supplying the package.  For application classes, the ClassLoader
 920 // object takes care of this.
 921 
 922 // For system (boot) classes, the Java code in the Package class needs
 923 // to be able to identify which source jar file contained the boot
 924 // class, so that it can extract the manifest from it.  This table
 925 // identifies java packages with jar files in the boot classpath.
 926 
 927 // Because the boot classpath cannot change, the classpath index is
 928 // sufficient to identify the source jar file or directory.  (Since
 929 // directories have no manifests, the directory name is not required,
 930 // but is available.)
 931 
 932 // When using sharing -- the pathnames of entries in the boot classpath
 933 // may not be the same at runtime as they were when the archive was
 934 // created (NFS, Samba, etc.).  The actual files and directories named
 935 // in the classpath must be the same files, in the same order, even
 936 // though the exact name is not the same.
 937 
 938 class PackageInfo: public BasicHashtableEntry<mtClass> {
 939 public:
 940   const char* _pkgname;       // Package name
 941   int _classpath_index;       // Index of directory or JAR file loaded from
 942 
 943   PackageInfo* next() {
 944     return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
 945   }
 946 
 947   const char* pkgname()           { return _pkgname; }
 948   void set_pkgname(char* pkgname) { _pkgname = pkgname; }
 949 
 950   const char* filename() {
 951     return ClassLoader::classpath_entry(_classpath_index)->name();
 952   }
 953 
 954   void set_index(int index) {
 955     _classpath_index = index;
 956   }
 957 };
 958 
 959 
 960 class PackageHashtable : public BasicHashtable<mtClass> {
 961 private:
 962   inline unsigned int compute_hash(const char *s, int n) {
 963     unsigned int val = 0;
 964     while (--n >= 0) {
 965       val = *s++ + 31 * val;
 966     }
 967     return val;
 968   }
 969 
 970   PackageInfo* bucket(int index) {
 971     return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
 972   }
 973 
 974   PackageInfo* get_entry(int index, unsigned int hash,
 975                          const char* pkgname, size_t n) {
 976     for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
 977       if (pp->hash() == hash &&
 978           strncmp(pkgname, pp->pkgname(), n) == 0 &&
 979           pp->pkgname()[n] == '\0') {
 980         return pp;
 981       }
 982     }
 983     return NULL;
 984   }
 985 
 986 public:
 987   PackageHashtable(int table_size)
 988     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
 989 
 990   PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
 991     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
 992 
 993   PackageInfo* get_entry(const char* pkgname, int n) {
 994     unsigned int hash = compute_hash(pkgname, n);
 995     return get_entry(hash_to_index(hash), hash, pkgname, n);
 996   }
 997 
 998   PackageInfo* new_entry(char* pkgname, int n) {
 999     unsigned int hash = compute_hash(pkgname, n);
1000     PackageInfo* pp;
1001     pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
1002     pp->set_pkgname(pkgname);
1003     return pp;
1004   }
1005 
1006   void add_entry(PackageInfo* pp) {
1007     int index = hash_to_index(pp->hash());
1008     BasicHashtable<mtClass>::add_entry(index, pp);
1009   }
1010 
1011   void copy_pkgnames(const char** packages) {
1012     int n = 0;
1013     for (int i = 0; i < table_size(); ++i) {
1014       for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
1015         packages[n++] = pp->pkgname();
1016       }
1017     }
1018     assert(n == number_of_entries(), "just checking");
1019   }
1020 
1021   CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
1022 };
1023 
1024 #if INCLUDE_CDS
1025 void PackageHashtable::copy_table(char** top, char* end,
1026                                   PackageHashtable* table) {
1027   // Copy (relocate) the table to the shared space.
1028   BasicHashtable<mtClass>::copy_table(top, end);
1029 
1030   // Calculate the space needed for the package name strings.
1031   int i;
1032   intptr_t* tableSize = (intptr_t*)(*top);
1033   *top += sizeof(intptr_t);  // For table size
1034   char* tableStart = *top;
1035 
1036   for (i = 0; i < table_size(); ++i) {
1037     for (PackageInfo* pp = table->bucket(i);
1038                       pp != NULL;
1039                       pp = pp->next()) {
1040       int n1 = (int)(strlen(pp->pkgname()) + 1);
1041       if (*top + n1 >= end) {
1042         report_out_of_shared_space(SharedMiscData);
1043       }
1044       pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
1045       *top += n1;
1046     }
1047   }
1048   *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
1049   if (*top >= end) {
1050     report_out_of_shared_space(SharedMiscData);
1051   }
1052 
1053   // Write table size
1054   intptr_t len = *top - (char*)tableStart;
1055   *tableSize = len;
1056 }
1057 
1058 
1059 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
1060   _package_hash_table->copy_buckets(top, end);
1061 }
1062 
1063 void ClassLoader::copy_package_info_table(char** top, char* end) {
1064   _package_hash_table->copy_table(top, end, _package_hash_table);
1065 }
1066 #endif
1067 
1068 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
1069   const char *cp = strrchr(pkgname, '/');
1070   if (cp != NULL) {
1071     // Package prefix found
1072     int n = cp - pkgname + 1;
1073     return _package_hash_table->get_entry(pkgname, n);
1074   }
1075   return NULL;
1076 }
1077 
1078 
1079 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
1080   assert(pkgname != NULL, "just checking");
1081   // Bootstrap loader no longer holds system loader lock obj serializing
1082   // load_instance_class and thereby add_package
1083   {
1084     MutexLocker ml(PackageTable_lock, THREAD);
1085     // First check for previously loaded entry
1086     PackageInfo* pp = lookup_package(pkgname);
1087     if (pp != NULL) {
1088       // Existing entry found, check source of package
1089       pp->set_index(classpath_index);
1090       return true;
1091     }
1092 
1093     const char *cp = strrchr(pkgname, '/');
1094     if (cp != NULL) {
1095       // Package prefix found
1096       int n = cp - pkgname + 1;
1097 
1098       char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
1099       if (new_pkgname == NULL) {
1100         return false;
1101       }
1102 
1103       memcpy(new_pkgname, pkgname, n);
1104       new_pkgname[n] = '\0';
1105       pp = _package_hash_table->new_entry(new_pkgname, n);
1106       pp->set_index(classpath_index);
1107 
1108       // Insert into hash table
1109       _package_hash_table->add_entry(pp);
1110     }
1111     return true;
1112   }
1113 }
1114 
1115 
1116 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1117   PackageInfo* pp;
1118   {
1119     MutexLocker ml(PackageTable_lock, THREAD);
1120     pp = lookup_package(name);
1121   }
1122   if (pp == NULL) {
1123     return NULL;
1124   } else {
1125     Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1126     return p();
1127   }
1128 }
1129 
1130 
1131 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1132   ResourceMark rm(THREAD);
1133   int nof_entries;
1134   const char** packages;
1135   {
1136     MutexLocker ml(PackageTable_lock, THREAD);
1137     // Allocate resource char* array containing package names
1138     nof_entries = _package_hash_table->number_of_entries();
1139     if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1140       return NULL;
1141     }
1142     _package_hash_table->copy_pkgnames(packages);
1143   }
1144   // Allocate objArray and fill with java.lang.String
1145   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1146                                            nof_entries, CHECK_0);
1147   objArrayHandle result(THREAD, r);
1148   for (int i = 0; i < nof_entries; i++) {
1149     Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1150     result->obj_at_put(i, str());
1151   }
1152 
1153   return result();
1154 }
1155 
1156 
1157 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1158   ResourceMark rm(THREAD);
1159   const char* class_name = h_name->as_C_string();
1160   EventMark m("loading class %s", class_name);
1161   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1162 
1163   stringStream st;
1164   // st.print() uses too much stack space while handling a StackOverflowError
1165   // st.print("%s.class", h_name->as_utf8());
1166   st.print_raw(h_name->as_utf8());
1167   st.print_raw(".class");
1168   const char* file_name = st.as_string();
1169   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1170 
1171   // Lookup stream for parsing .class file
1172   ClassFileStream* stream = NULL;
1173   int classpath_index = 0;
1174   ClassPathEntry* e = NULL;
1175   instanceKlassHandle h;
1176   {
1177     PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1178                                ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1179                                PerfClassTraceTime::CLASS_LOAD);
1180     e = _first_entry;
1181     while (e != NULL) {
1182       stream = e->open_stream(file_name, CHECK_NULL);
1183       if (!context.check(stream, classpath_index)) {
1184         return h; // NULL
1185       }
1186       if (stream != NULL) {
1187         break;
1188       }
1189       e = e->next();
1190       ++classpath_index;
1191     }
1192   }
1193 
1194   if (stream != NULL) {
1195     // class file found, parse it
1196     ClassFileParser parser(stream);
1197     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1198     Handle protection_domain;
1199     TempNewSymbol parsed_name = NULL;
1200     instanceKlassHandle result = parser.parseClassFile(h_name,
1201                                                        loader_data,
1202                                                        protection_domain,
1203                                                        parsed_name,
1204                                                        context.should_verify(classpath_index),
1205                                                        THREAD);
1206     if (HAS_PENDING_EXCEPTION) {
1207       ResourceMark rm;
1208       if (DumpSharedSpaces) {
1209         tty->print_cr("Preload Error: Failed to load %s", class_name);
1210       }
1211       return h;
1212     }
1213     h = context.record_result(classpath_index, e, result, THREAD);
1214   } else {
1215     if (DumpSharedSpaces) {
1216       tty->print_cr("Preload Warning: Cannot find %s", class_name);
1217     }
1218   }
1219 
1220   return h;
1221 }
1222 
1223 
1224 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1225                                             int number_of_entries) {
1226   assert(_package_hash_table == NULL, "One package info table allowed.");
1227   assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1228          "bad shared package info size.");
1229   _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1230                                              number_of_entries);
1231 }
1232 
1233 
1234 void ClassLoader::create_package_info_table() {
1235     assert(_package_hash_table == NULL, "shouldn't have one yet");
1236     _package_hash_table = new PackageHashtable(package_hash_table_size);
1237 }
1238 
1239 
1240 // Initialize the class loader's access to methods in libzip.  Parse and
1241 // process the boot classpath into a list ClassPathEntry objects.  Once
1242 // this list has been created, it must not change order (see class PackageInfo)
1243 // it can be appended to and is by jvmti and the kernel vm.
1244 
1245 void ClassLoader::initialize() {
1246   assert(_package_hash_table == NULL, "should have been initialized by now.");
1247   EXCEPTION_MARK;
1248 
1249   if (UsePerfData) {
1250     // jvmstat performance counters
1251     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1252     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1253     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1254     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1255     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1256     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1257     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1258     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1259     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1260     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1261 
1262     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1263     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1264     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1265     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1266     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1267     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1268     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1269     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1270     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1271     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1272     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1273     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1274     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1275 
1276 
1277     // The following performance counters are added for measuring the impact
1278     // of the bug fix of 6365597. They are mainly focused on finding out
1279     // the behavior of system & user-defined classloader lock, whether
1280     // ClassLoader.loadClass/findClass is being called synchronized or not.
1281     // Also two additional counters are created to see whether 'UnsyncloadClass'
1282     // flag is being set or not and how many times load_instance_class call
1283     // fails with linkageError etc.
1284     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1285                         "systemLoaderLockContentionRate");
1286     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1287                         "nonSystemLoaderLockContentionRate");
1288     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1289                         "jvmFindLoadedClassNoLockCalls");
1290     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1291                         "jvmDefineClassNoLockCalls");
1292 
1293     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1294                         "jniDefineClassNoLockCalls");
1295 
1296     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1297                         "unsafeDefineClassCalls");
1298 
1299     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1300     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1301                         "loadInstanceClassFailRate");
1302 
1303     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1304     if (UnsyncloadClass) {
1305       _isUnsyncloadClass->inc();
1306     }
1307   }
1308 
1309   // lookup zip library entry points
1310   load_zip_library();
1311 #if INCLUDE_CDS
1312   // initialize search path
1313   if (DumpSharedSpaces) {
1314     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1315   }
1316 #endif
1317   setup_bootstrap_search_path();
1318   if (LazyBootClassLoader) {
1319     // set up meta index which makes boot classpath initialization lazier
1320     setup_bootstrap_meta_index();
1321   }
1322 }
1323 
1324 #if INCLUDE_CDS
1325 void ClassLoader::initialize_shared_path() {
1326   if (DumpSharedSpaces) {
1327     ClassLoaderExt::setup_search_paths();
1328     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1329   }
1330 }
1331 #endif
1332 
1333 jlong ClassLoader::classloader_time_ms() {
1334   return UsePerfData ?
1335     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1336 }
1337 
1338 jlong ClassLoader::class_init_count() {
1339   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1340 }
1341 
1342 jlong ClassLoader::class_init_time_ms() {
1343   return UsePerfData ?
1344     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1345 }
1346 
1347 jlong ClassLoader::class_verify_time_ms() {
1348   return UsePerfData ?
1349     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1350 }
1351 
1352 jlong ClassLoader::class_link_count() {
1353   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1354 }
1355 
1356 jlong ClassLoader::class_link_time_ms() {
1357   return UsePerfData ?
1358     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1359 }
1360 
1361 int ClassLoader::compute_Object_vtable() {
1362   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1363   // code to determine actual value from file
1364   // Would be value '11' if finals were in vtable
1365   int JDK_1_2_Object_vtable_size = 5;
1366   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1367 }
1368 
1369 
1370 void classLoader_init() {
1371   ClassLoader::initialize();
1372 }
1373 
1374 
1375 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1376   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1377   if (CanonicalizeEntry != NULL) {
1378     JavaThread* THREAD = JavaThread::current();
1379     JNIEnv* env = THREAD->jni_environment();
1380     ResourceMark rm(THREAD);
1381 
1382     // os::native_path writes into orig_copy
1383     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1384     strcpy(orig_copy, orig);
1385     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1386       return false;
1387     }
1388   } else {
1389     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1390     strncpy(out, orig, len);
1391     out[len - 1] = '\0';
1392   }
1393   return true;
1394 }
1395 
1396 #ifndef PRODUCT
1397 
1398 void ClassLoader::verify() {
1399   _package_hash_table->verify();
1400 }
1401 
1402 
1403 // CompileTheWorld
1404 //
1405 // Iterates over all class path entries and forces compilation of all methods
1406 // in all classes found. Currently, only zip/jar archives are searched.
1407 //
1408 // The classes are loaded by the Java level bootstrap class loader, and the
1409 // initializer is called. If DelayCompilationDuringStartup is true (default),
1410 // the interpreter will run the initialization code. Note that forcing
1411 // initialization in this way could potentially lead to initialization order
1412 // problems, in which case we could just force the initialization bit to be set.
1413 
1414 
1415 // We need to iterate over the contents of a zip/jar file, so we replicate the
1416 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1417 // since jzfile already has a void* definition.
1418 //
1419 // Note that this is only used in debug mode.
1420 //
1421 // HotSpot integration note:
1422 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1423 
1424 
1425 // JDK 1.3 version
1426 typedef struct real_jzentry {         /* Zip file entry */
1427     char *name;                 /* entry name */
1428     jint time;                  /* modification time */
1429     jint size;                  /* size of uncompressed data */
1430     jint csize;                 /* size of compressed data (zero if uncompressed) */
1431     jint crc;                   /* crc of uncompressed data */
1432     char *comment;              /* optional zip file comment */
1433     jbyte *extra;               /* optional extra data */
1434     jint pos;                   /* position of LOC header (if negative) or data */
1435 } real_jzentry;
1436 
1437 typedef struct real_jzfile {  /* Zip file */
1438     char *name;                 /* zip file name */
1439     jint refs;                  /* number of active references */
1440     jint fd;                    /* open file descriptor */
1441     void *lock;                 /* read lock */
1442     char *comment;              /* zip file comment */
1443     char *msg;                  /* zip error message */
1444     void *entries;              /* array of hash cells */
1445     jint total;                 /* total number of entries */
1446     unsigned short *table;      /* Hash chain heads: indexes into entries */
1447     jint tablelen;              /* number of hash eads */
1448     real_jzfile *next;        /* next zip file in search list */
1449     jzentry *cache;             /* we cache the most recently freed jzentry */
1450     /* Information on metadata names in META-INF directory */
1451     char **metanames;           /* array of meta names (may have null names) */
1452     jint metacount;             /* number of slots in metanames array */
1453     /* If there are any per-entry comments, they are in the comments array */
1454     char **comments;
1455 } real_jzfile;
1456 
1457 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1458   // For now we only compile all methods in all classes in zip/jar files
1459   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1460   tty->cr();
1461 }
1462 
1463 bool ClassPathDirEntry::is_jrt() {
1464   return false;
1465 }
1466 
1467 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1468   real_jzfile* zip = (real_jzfile*) _zip;
1469   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1470   tty->cr();
1471   // Iterate over all entries in zip file
1472   for (int n = 0; ; n++) {
1473     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1474     if (ze == NULL) break;
1475     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1476   }
1477   if (HAS_PENDING_EXCEPTION) {
1478     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1479       CLEAR_PENDING_EXCEPTION;
1480       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1481       tty->print_cr("Increase class metadata storage if a limit was set");
1482     } else {
1483       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1484     }
1485   }
1486 }
1487 
1488 bool ClassPathZipEntry::is_jrt() {
1489   real_jzfile* zip = (real_jzfile*) _zip;
1490   int len = (int)strlen(zip->name);
1491   // Check whether zip name ends in "rt.jar"
1492   // This will match other archives named rt.jar as well, but this is
1493   // only used for debugging.
1494   return string_ends_with(zip->name, "rt.jar");
1495 }
1496 
1497 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1498   ClassPathEntry* cpe = resolve_entry(THREAD);
1499   if (cpe != NULL) {
1500     cpe->compile_the_world(loader, CHECK);
1501   }
1502 }
1503 
1504 bool LazyClassPathEntry::is_jrt() {
1505   Thread* THREAD = Thread::current();
1506   ClassPathEntry* cpe = resolve_entry(THREAD);
1507   return (cpe != NULL) ? cpe->is_jar_file() : false;
1508 }
1509 
1510 void ClassLoader::compile_the_world() {
1511   EXCEPTION_MARK;
1512   HandleMark hm(THREAD);
1513   ResourceMark rm(THREAD);
1514   // Make sure we don't run with background compilation
1515   BackgroundCompilation = false;
1516   // Find bootstrap loader
1517   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1518   // Iterate over all bootstrap class path entries
1519   ClassPathEntry* e = _first_entry;
1520   jlong start = os::javaTimeMillis();
1521   while (e != NULL) {
1522     // We stop at rt.jar, unless it is the first bootstrap path entry
1523     if (e->is_jrt() && e != _first_entry) break;
1524     e->compile_the_world(system_class_loader, CATCH);
1525     e = e->next();
1526   }
1527   jlong end = os::javaTimeMillis();
1528   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1529                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1530   {
1531     // Print statistics as if before normal exit:
1532     extern void print_statistics();
1533     print_statistics();
1534   }
1535   vm_exit(0);
1536 }
1537 
1538 int ClassLoader::_compile_the_world_class_counter = 0;
1539 int ClassLoader::_compile_the_world_method_counter = 0;
1540 static int _codecache_sweep_counter = 0;
1541 
1542 // Filter out all exceptions except OOMs
1543 static void clear_pending_exception_if_not_oom(TRAPS) {
1544   if (HAS_PENDING_EXCEPTION &&
1545       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1546     CLEAR_PENDING_EXCEPTION;
1547   }
1548   // The CHECK at the caller will propagate the exception out
1549 }
1550 
1551 /**
1552  * Returns if the given method should be compiled when doing compile-the-world.
1553  *
1554  * TODO:  This should be a private method in a CompileTheWorld class.
1555  */
1556 static bool can_be_compiled(methodHandle m, int comp_level) {
1557   assert(CompileTheWorld, "must be");
1558 
1559   // It's not valid to compile a native wrapper for MethodHandle methods
1560   // that take a MemberName appendix since the bytecode signature is not
1561   // correct.
1562   vmIntrinsics::ID iid = m->intrinsic_id();
1563   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1564     return false;
1565   }
1566 
1567   return CompilationPolicy::can_be_compiled(m, comp_level);
1568 }
1569 
1570 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1571   if (string_ends_with(name, ".class")) {
1572     // We have a .class file
1573     int len = (int)strlen(name);
1574     char buffer[2048];
1575     strncpy(buffer, name, len - 6);
1576     buffer[len-6] = 0;
1577     // If the file has a period after removing .class, it's not really a
1578     // valid class file.  The class loader will check everything else.
1579     if (strchr(buffer, '.') == NULL) {
1580       _compile_the_world_class_counter++;
1581       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1582 
1583       // Construct name without extension
1584       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1585       // Use loader to load and initialize class
1586       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1587       instanceKlassHandle k (THREAD, ik);
1588       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1589         k->initialize(THREAD);
1590       }
1591       bool exception_occurred = HAS_PENDING_EXCEPTION;
1592       clear_pending_exception_if_not_oom(CHECK);
1593       if (CompileTheWorldPreloadClasses && k.not_null()) {
1594         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1595         if (HAS_PENDING_EXCEPTION) {
1596           // If something went wrong in preloading we just ignore it
1597           clear_pending_exception_if_not_oom(CHECK);
1598           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1599         }
1600       }
1601 
1602       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1603         if (k.is_null() || exception_occurred) {
1604           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1605           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1606         } else {
1607           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1608           // Preload all classes to get around uncommon traps
1609           // Iterate over all methods in class
1610           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1611           for (int n = 0; n < k->methods()->length(); n++) {
1612             methodHandle m (THREAD, k->methods()->at(n));
1613             if (can_be_compiled(m, comp_level)) {
1614               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1615                 // Give sweeper a chance to keep up with CTW
1616                 VM_ForceSafepoint op;
1617                 VMThread::execute(&op);
1618                 _codecache_sweep_counter = 0;
1619               }
1620               // Force compilation
1621               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1622                                             methodHandle(), 0, "CTW", THREAD);
1623               if (HAS_PENDING_EXCEPTION) {
1624                 clear_pending_exception_if_not_oom(CHECK);
1625                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1626               } else {
1627                 _compile_the_world_method_counter++;
1628               }
1629               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1630                 // Clobber the first compile and force second tier compilation
1631                 nmethod* nm = m->code();
1632                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1633                   // Throw out the code so that the code cache doesn't fill up
1634                   nm->make_not_entrant();
1635                   m->clear_code();
1636                 }
1637                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1638                                               methodHandle(), 0, "CTW", THREAD);
1639                 if (HAS_PENDING_EXCEPTION) {
1640                   clear_pending_exception_if_not_oom(CHECK);
1641                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1642                 } else {
1643                   _compile_the_world_method_counter++;
1644                 }
1645               }
1646             } else {
1647               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1648             }
1649 
1650             nmethod* nm = m->code();
1651             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1652               // Throw out the code so that the code cache doesn't fill up
1653               nm->make_not_entrant();
1654               m->clear_code();
1655             }
1656           }
1657         }
1658       }
1659     }
1660   }
1661 }
1662 
1663 #endif //PRODUCT
1664 
1665 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1666 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1667 void PerfClassTraceTime::initialize() {
1668   if (!UsePerfData) return;
1669 
1670   if (_eventp != NULL) {
1671     // increment the event counter
1672     _eventp->inc();
1673   }
1674 
1675   // stop the current active thread-local timer to measure inclusive time
1676   _prev_active_event = -1;
1677   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1678      if (_timers[i].is_active()) {
1679        assert(_prev_active_event == -1, "should have only one active timer");
1680        _prev_active_event = i;
1681        _timers[i].stop();
1682      }
1683   }
1684 
1685   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1686     // start the inclusive timer if not recursively called
1687     _t.start();
1688   }
1689 
1690   // start thread-local timer of the given event type
1691    if (!_timers[_event_type].is_active()) {
1692     _timers[_event_type].start();
1693   }
1694 }
1695 
1696 PerfClassTraceTime::~PerfClassTraceTime() {
1697   if (!UsePerfData) return;
1698 
1699   // stop the thread-local timer as the event completes
1700   // and resume the thread-local timer of the event next on the stack
1701   _timers[_event_type].stop();
1702   jlong selftime = _timers[_event_type].ticks();
1703 
1704   if (_prev_active_event >= 0) {
1705     _timers[_prev_active_event].start();
1706   }
1707 
1708   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1709 
1710   // increment the counters only on the leaf call
1711   _t.stop();
1712   _timep->inc(_t.ticks());
1713   if (_selftimep != NULL) {
1714     _selftimep->inc(selftime);
1715   }
1716   // add all class loading related event selftime to the accumulated time counter
1717   ClassLoader::perf_accumulated_time()->inc(selftime);
1718 
1719   // reset the timer
1720   _timers[_event_type].reset();
1721 }
--- EOF ---