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 #if INCLUDE_CDS
  34 #include "classfile/sharedPathsMiscInfo.hpp"
  35 #include "classfile/sharedClassUtil.hpp"
  36 #endif
  37 #include "classfile/systemDictionary.hpp"
  38 #include "classfile/vmSymbols.hpp"
  39 #include "compiler/compileBroker.hpp"
  40 #include "gc_interface/collectedHeap.inline.hpp"
  41 #include "interpreter/bytecodeStream.hpp"
  42 #include "interpreter/oopMapCache.hpp"
  43 #include "memory/allocation.inline.hpp"
  44 #include "memory/filemap.hpp"
  45 #include "memory/generation.hpp"
  46 #include "memory/oopFactory.hpp"
  47 #include "memory/universe.inline.hpp"
  48 #include "oops/instanceKlass.hpp"
  49 #include "oops/instanceRefKlass.hpp"
  50 #include "oops/oop.inline.hpp"
  51 #include "oops/symbol.hpp"
  52 #include "prims/jvm_misc.hpp"
  53 #include "runtime/arguments.hpp"
  54 #include "runtime/compilationPolicy.hpp"
  55 #include "runtime/fprofiler.hpp"
  56 #include "runtime/handles.hpp"
  57 #include "runtime/handles.inline.hpp"
  58 #include "runtime/init.hpp"
  59 #include "runtime/interfaceSupport.hpp"
  60 #include "runtime/java.hpp"
  61 #include "runtime/javaCalls.hpp"
  62 #include "runtime/os.hpp"
  63 #include "runtime/threadCritical.hpp"
  64 #include "runtime/timer.hpp"
  65 #include "services/management.hpp"
  66 #include "services/threadService.hpp"
  67 #include "utilities/events.hpp"
  68 #include "utilities/hashtable.hpp"
  69 #include "utilities/hashtable.inline.hpp"
  70 
  71 // Entry points in zip.dll for loading zip/jar file entries and image file entries
  72 
  73 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  74 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  75 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  76 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  77 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  78 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  79 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  80 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  81 
  82 static ZipOpen_t         ZipOpen            = NULL;
  83 static ZipClose_t        ZipClose           = NULL;
  84 static FindEntry_t       FindEntry          = NULL;
  85 static ReadEntry_t       ReadEntry          = NULL;
  86 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  87 static GetNextEntry_t    GetNextEntry       = NULL;
  88 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  89 static ZipInflateFully_t ZipInflateFully   = NULL;
  90 static Crc32_t           Crc32              = NULL;
  91 
  92 // Globals
  93 
  94 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
  95 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
  96 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
  97 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
  98 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
  99 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 100 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 101 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 102 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 103 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 104 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 105 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 106 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 107 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 108 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 109 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 110 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 111 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 112 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 113 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 114 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 115 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 116 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 117 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 118 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 119 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 120 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 121 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 122 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 123 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 124 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 125 
 126 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 127 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 128 int             ClassLoader::_num_entries         = 0;
 129 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 130 
 131 #if INCLUDE_CDS
 132 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 133 #endif
 134 // helper routines
 135 bool string_starts_with(const char* str, const char* str_to_find) {
 136   size_t str_len = strlen(str);
 137   size_t str_to_find_len = strlen(str_to_find);
 138   if (str_to_find_len > str_len) {
 139     return false;
 140   }
 141   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 142 }
 143 
 144 bool string_ends_with(const char* str, const char* str_to_find) {
 145   size_t str_len = strlen(str);
 146   size_t str_to_find_len = strlen(str_to_find);
 147   if (str_to_find_len > str_len) {
 148     return false;
 149   }
 150   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 151 }
 152 
 153 
 154 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
 155   if (num_meta_package_names == 0) {
 156     _meta_package_names = NULL;
 157     _num_meta_package_names = 0;
 158   } else {
 159     _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
 160     _num_meta_package_names = num_meta_package_names;
 161     memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
 162   }
 163 }
 164 
 165 
 166 MetaIndex::~MetaIndex() {
 167   FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
 168 }
 169 
 170 
 171 bool MetaIndex::may_contain(const char* class_name) {
 172   if ( _num_meta_package_names == 0) {
 173     return false;
 174   }
 175   size_t class_name_len = strlen(class_name);
 176   for (int i = 0; i < _num_meta_package_names; i++) {
 177     char* pkg = _meta_package_names[i];
 178     size_t pkg_len = strlen(pkg);
 179     size_t min_len = MIN2(class_name_len, pkg_len);
 180     if (!strncmp(class_name, pkg, min_len)) {
 181       return true;
 182     }
 183   }
 184   return false;
 185 }
 186 
 187 
 188 ClassPathEntry::ClassPathEntry() {
 189   set_next(NULL);
 190 }
 191 
 192 
 193 bool ClassPathEntry::is_lazy() {
 194   return false;
 195 }
 196 
 197 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 198   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 199   strcpy(copy, dir);
 200   _dir = copy;
 201 }
 202 
 203 
 204 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 205   // construct full path name
 206   char path[JVM_MAXPATHLEN];
 207   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 208     return NULL;
 209   }
 210   // check if file exists
 211   struct stat st;
 212   if (os::stat(path, &st) == 0) {
 213 #if INCLUDE_CDS
 214     if (DumpSharedSpaces) {
 215       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 216       // we should never find a file underneath it -- unless user has added a new file while we are running
 217       // the dump, in which case let's quit!
 218       ShouldNotReachHere();
 219     }
 220 #endif
 221     // found file, open it
 222     int file_handle = os::open(path, 0, 0);
 223     if (file_handle != -1) {
 224       // read contents into resource array
 225       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 226       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 227       // close file
 228       os::close(file_handle);
 229       // construct ClassFileStream
 230       if (num_read == (size_t)st.st_size) {
 231         if (UsePerfData) {
 232           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 233         }
 234         return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
 235       }
 236     }
 237   }
 238   return NULL;
 239 }
 240 
 241 
 242 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
 243   _zip = zip;
 244   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 245   strcpy(copy, zip_name);
 246   _zip_name = copy;
 247 }
 248 
 249 ClassPathZipEntry::~ClassPathZipEntry() {
 250   if (ZipClose != NULL) {
 251     (*ZipClose)(_zip);
 252   }
 253   FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
 254 }
 255 
 256 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 257     // enable call to C land
 258   JavaThread* thread = JavaThread::current();
 259   ThreadToNativeFromVM ttn(thread);
 260   // check whether zip archive contains name
 261   jint name_len;
 262   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 263   if (entry == NULL) return NULL;
 264   u1* buffer;
 265   char name_buf[128];
 266   char* filename;
 267   if (name_len < 128) {
 268     filename = name_buf;
 269   } else {
 270     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 271   }
 272 
 273   // file found, get pointer to the entry in mmapped jar file.
 274   if (ReadMappedEntry == NULL ||
 275       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 276       // mmapped access not available, perhaps due to compression,
 277       // read contents into resource array
 278       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 279       buffer = NEW_RESOURCE_ARRAY(u1, size);
 280       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 281   }
 282 
 283   // return result
 284   if (nul_terminate) {
 285     buffer[*filesize] = 0;
 286   }
 287   return buffer;
 288 }
 289 
 290 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 291   jint filesize;
 292   u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
 293   if (buffer == NULL) {
 294     return NULL;
 295   }
 296   if (UsePerfData) {
 297     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 298   }
 299   return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
 300 }
 301 
 302 // invoke function for each entry in the zip file
 303 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 304   JavaThread* thread = JavaThread::current();
 305   HandleMark  handle_mark(thread);
 306   ThreadToNativeFromVM ttn(thread);
 307   for (int n = 0; ; n++) {
 308     jzentry * ze = ((*GetNextEntry)(_zip, n));
 309     if (ze == NULL) break;
 310     (*f)(ze->name, context);
 311   }
 312 }
 313 
 314 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
 315   _path = os::strdup_check_oom(path);
 316   _st = *st;
 317   _meta_index = NULL;
 318   _resolved_entry = NULL;
 319   _has_error = false;
 320   _throw_exception = throw_exception;
 321 }
 322 
 323 LazyClassPathEntry::~LazyClassPathEntry() {
 324   os::free((void*)_path);
 325 }
 326 
 327 bool LazyClassPathEntry::is_jar_file() {
 328   size_t len = strlen(_path);
 329   if (len < 4 || strcmp(_path + len - 4, ".jar") != 0) return false;
 330   return ((_st.st_mode & S_IFREG) == S_IFREG);
 331 }
 332 
 333 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
 334   if (_resolved_entry != NULL) {
 335     return (ClassPathEntry*) _resolved_entry;
 336   }
 337   ClassPathEntry* new_entry = NULL;
 338   new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
 339   if (!_throw_exception && new_entry == NULL) {
 340     assert(!HAS_PENDING_EXCEPTION, "must be");
 341     return NULL;
 342   }
 343   {
 344     ThreadCritical tc;
 345     if (_resolved_entry == NULL) {
 346       _resolved_entry = new_entry;
 347       return new_entry;
 348     }
 349   }
 350   assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
 351   delete new_entry;
 352   return (ClassPathEntry*) _resolved_entry;
 353 }
 354 
 355 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
 356   if (_meta_index != NULL &&
 357       !_meta_index->may_contain(name)) {
 358     return NULL;
 359   }
 360   if (_has_error) {
 361     return NULL;
 362   }
 363   ClassPathEntry* cpe = resolve_entry(THREAD);
 364   if (cpe == NULL) {
 365     _has_error = true;
 366     return NULL;
 367   } else {
 368     return cpe->open_stream(name, THREAD);
 369   }
 370 }
 371 
 372 bool LazyClassPathEntry::is_lazy() {
 373   return true;
 374 }
 375 
 376 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 377   if (_has_error) {
 378     return NULL;
 379   }
 380   ClassPathEntry* cpe = resolve_entry(THREAD);
 381   if (cpe == NULL) {
 382     _has_error = true;
 383     return NULL;
 384   } else if (cpe->is_jar_file()) {
 385     return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
 386   } else {
 387     ShouldNotReachHere();
 388     *filesize = 0;
 389     return NULL;
 390   }
 391 }
 392 
 393 ClassPathImageEntry::ClassPathImageEntry(char* name) : ClassPathEntry(), _image(new ImageFile(name)) {
 394   bool opened = _image->open();
 395   if (!opened) {
 396     _image = NULL;
 397   }
 398 }
 399 
 400 ClassPathImageEntry::~ClassPathImageEntry() {
 401   if (_image) {
 402     _image->close();
 403     _image = NULL;
 404   }
 405 }
 406 
 407 const char* ClassPathImageEntry::name() {
 408   return _image ? _image->name() : "";
 409 }
 410 
 411 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 412   u1* buffer;
 413   u8 size;
 414   _image->get_resource(name, buffer, size);
 415 
 416   if (buffer) {
 417     if (UsePerfData) {
 418       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 419     }
 420     return new ClassFileStream(buffer, (int)size, (char*)name);  // Resource allocated
 421   }
 422 
 423   return NULL;
 424 }
 425 
 426 #ifndef PRODUCT
 427 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 428   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 429   tty->cr();
 430   const ImageStrings strings = _image->get_strings();
 431   // Retrieve each path component string.
 432   u4 count = _image->get_location_count();
 433   for (u4 i = 0; i < count; i++) {
 434     u1* location_data = _image->get_location_data(i);
 435 
 436     if (location_data) {
 437        ImageLocation location(location_data);
 438        const char* parent = location.get_attribute(ImageLocation::ATTRIBUTE_PARENT, strings);
 439        const char* base = location.get_attribute(ImageLocation::ATTRIBUTE_BASE, strings);
 440        const char* extension = location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION, strings);
 441        assert((strlen(parent) + strlen(base) + strlen(extension)) < JVM_MAXPATHLEN, "path exceeds buffer");
 442        char path[JVM_MAXPATHLEN];
 443        strcpy(path, parent);
 444        strcat(path, base);
 445        strcat(path, extension);
 446        ClassLoader::compile_the_world_in(path, loader, CHECK);
 447     }
 448   }
 449   if (HAS_PENDING_EXCEPTION) {
 450   if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 451     CLEAR_PENDING_EXCEPTION;
 452     tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 453     tty->print_cr("Increase class metadata storage if a limit was set");
 454   } else {
 455     tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 456   }
 457   }
 458 }
 459 
 460 bool ClassPathImageEntry::is_jrt() {
 461   return string_ends_with(name(), "bootmodules.jimage");
 462 }
 463 #endif
 464 
 465 static void print_meta_index(LazyClassPathEntry* entry,
 466                              GrowableArray<char*>& meta_packages) {
 467   tty->print("[Meta index for %s=", entry->name());
 468   for (int i = 0; i < meta_packages.length(); i++) {
 469     if (i > 0) tty->print(" ");
 470     tty->print("%s", meta_packages.at(i));
 471   }
 472   tty->print_cr("]");
 473 }
 474 
 475 #if INCLUDE_CDS
 476 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 477   assert(DumpSharedSpaces, "only called at dump time");
 478   tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
 479   vm_exit_during_initialization(error, message);
 480 }
 481 #endif
 482 
 483 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 484   if (!TraceClassPaths) {
 485     return;
 486   }
 487 
 488   if (msg) {
 489     tty->print("%s", msg);
 490   }
 491   if (name) {
 492     if (strlen(name) < 256) {
 493       tty->print("%s", name);
 494     } else {
 495       // For very long paths, we need to print each character separately,
 496       // as print_cr() has a length limit
 497       while (name[0] != '\0') {
 498         tty->print("%c", name[0]);
 499         name++;
 500       }
 501     }
 502   }
 503   if (msg && msg[0] == '[') {
 504     tty->print_cr("]");
 505   } else {
 506     tty->cr();
 507   }
 508 }
 509 
 510 void ClassLoader::setup_bootstrap_meta_index() {
 511   // Set up meta index which allows us to open boot jars lazily if
 512   // class data sharing is enabled
 513   const char* meta_index_path = Arguments::get_meta_index_path();
 514   const char* meta_index_dir  = Arguments::get_meta_index_dir();
 515   setup_meta_index(meta_index_path, meta_index_dir, 0);
 516 }
 517 
 518 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
 519   const char* known_version = "% VERSION 2";
 520   FILE* file = fopen(meta_index_path, "r");
 521   int line_no = 0;
 522 #if INCLUDE_CDS
 523   if (DumpSharedSpaces) {
 524     if (file != NULL) {
 525       _shared_paths_misc_info->add_required_file(meta_index_path);
 526     } else {
 527       _shared_paths_misc_info->add_nonexist_path(meta_index_path);
 528     }
 529   }
 530 #endif
 531   if (file != NULL) {
 532     ResourceMark rm;
 533     LazyClassPathEntry* cur_entry = NULL;
 534     GrowableArray<char*> boot_class_path_packages(10);
 535     char package_name[256];
 536     bool skipCurrentJar = false;
 537     while (fgets(package_name, sizeof(package_name), file) != NULL) {
 538       ++line_no;
 539       // Remove trailing newline
 540       package_name[strlen(package_name) - 1] = '\0';
 541       switch(package_name[0]) {
 542         case '%':
 543         {
 544           if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
 545             if (TraceClassLoading && Verbose) {
 546               tty->print("[Unsupported meta index version]");
 547             }
 548             fclose(file);
 549             return;
 550           }
 551         }
 552 
 553         // These directives indicate jar files which contain only
 554         // classes, only non-classfile resources, or a combination of
 555         // the two. See src/share/classes/sun/misc/MetaIndex.java and
 556         // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
 557         // workspace.
 558         case '#':
 559         case '!':
 560         case '@':
 561         {
 562           // Hand off current packages to current lazy entry (if any)
 563           if ((cur_entry != NULL) &&
 564               (boot_class_path_packages.length() > 0)) {
 565             if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 566               print_meta_index(cur_entry, boot_class_path_packages);
 567             }
 568             MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 569                                              boot_class_path_packages.length());
 570             cur_entry->set_meta_index(index);
 571           }
 572           cur_entry = NULL;
 573           boot_class_path_packages.clear();
 574 
 575           // Find lazy entry corresponding to this jar file
 576           int count = 0;
 577           for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
 578             if (count >= start_index &&
 579                 entry->is_lazy() &&
 580                 string_starts_with(entry->name(), meta_index_dir) &&
 581                 string_ends_with(entry->name(), &package_name[2])) {
 582               cur_entry = (LazyClassPathEntry*) entry;
 583               break;
 584             }
 585           }
 586 
 587           // If the first character is '@', it indicates the following jar
 588           // file is a resource only jar file in which case, we should skip
 589           // reading the subsequent entries since the resource loading is
 590           // totally handled by J2SE side.
 591           if (package_name[0] == '@') {
 592             if (cur_entry != NULL) {
 593               cur_entry->set_meta_index(new MetaIndex(NULL, 0));
 594             }
 595             cur_entry = NULL;
 596             skipCurrentJar = true;
 597           } else {
 598             skipCurrentJar = false;
 599           }
 600 
 601           break;
 602         }
 603 
 604         default:
 605         {
 606           if (!skipCurrentJar && cur_entry != NULL) {
 607             char* new_name = os::strdup_check_oom(package_name);
 608             boot_class_path_packages.append(new_name);
 609           }
 610         }
 611       }
 612     }
 613     // Hand off current packages to current lazy entry (if any)
 614     if ((cur_entry != NULL) &&
 615         (boot_class_path_packages.length() > 0)) {
 616       if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 617         print_meta_index(cur_entry, boot_class_path_packages);
 618       }
 619       MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 620                                        boot_class_path_packages.length());
 621       cur_entry->set_meta_index(index);
 622     }
 623     fclose(file);
 624   }
 625 }
 626 
 627 #if INCLUDE_CDS
 628 void ClassLoader::check_shared_classpath(const char *path) {
 629   if (strcmp(path, "") == 0) {
 630     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 631   }
 632 
 633   struct stat st;
 634   if (os::stat(path, &st) == 0) {
 635     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 636       if (!os::dir_is_empty(path)) {
 637         tty->print_cr("Error: non-empty directory '%s'", path);
 638         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 639       }
 640     }
 641   }
 642 }
 643 #endif
 644 
 645 void ClassLoader::setup_bootstrap_search_path() {
 646   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 647   const char* sys_class_path = Arguments::get_sysclasspath();
 648   if (PrintSharedArchiveAndExit) {
 649     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 650     // the same as the bootcp of the shared archive.
 651   } else {
 652     trace_class_path("[Bootstrap loader class path=", sys_class_path);
 653   }
 654 #if INCLUDE_CDS
 655   if (DumpSharedSpaces) {
 656     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 657   }
 658 #endif
 659   setup_search_path(sys_class_path);
 660 }
 661 
 662 #if INCLUDE_CDS
 663 int ClassLoader::get_shared_paths_misc_info_size() {
 664   return _shared_paths_misc_info->get_used_bytes();
 665 }
 666 
 667 void* ClassLoader::get_shared_paths_misc_info() {
 668   return _shared_paths_misc_info->buffer();
 669 }
 670 
 671 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 672   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 673   bool result = checker->check();
 674   delete checker;
 675   return result;
 676 }
 677 #endif
 678 
 679 void ClassLoader::setup_search_path(const char *class_path) {
 680   int offset = 0;
 681   int len = (int)strlen(class_path);
 682   int end = 0;
 683 
 684   // Iterate over class path entries
 685   for (int start = 0; start < len; start = end) {
 686     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 687       end++;
 688     }
 689     EXCEPTION_MARK;
 690     ResourceMark rm(THREAD);
 691     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 692     strncpy(path, &class_path[start], end - start);
 693     path[end - start] = '\0';
 694     update_class_path_entry_list(path, false);
 695 #if INCLUDE_CDS
 696     if (DumpSharedSpaces) {
 697       check_shared_classpath(path);
 698     }
 699 #endif
 700     while (class_path[end] == os::path_separator()[0]) {
 701       end++;
 702     }
 703   }
 704 }
 705 
 706 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 707                                                      bool lazy, bool throw_exception, TRAPS) {
 708   JavaThread* thread = JavaThread::current();
 709   if (lazy) {
 710     return new LazyClassPathEntry(path, st, throw_exception);
 711   }
 712   ClassPathEntry* new_entry = NULL;
 713   if ((st->st_mode & S_IFREG) == S_IFREG) {
 714     // Regular file, should be a zip or image file
 715     // Canonicalized filename
 716     char canonical_path[JVM_MAXPATHLEN];
 717     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 718       // This matches the classic VM
 719       if (throw_exception) {
 720         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 721       } else {
 722         return NULL;
 723       }
 724     }
 725     // TODO - add proper criteria for selecting image file
 726     ClassPathImageEntry* entry = new ClassPathImageEntry(canonical_path);
 727     if (entry->is_open()) {
 728       new_entry = entry;
 729     } else {
 730     char* error_msg = NULL;
 731     jzfile* zip;
 732     {
 733       // enable call to C land
 734       ThreadToNativeFromVM ttn(thread);
 735       HandleMark hm(thread);
 736       zip = (*ZipOpen)(canonical_path, &error_msg);
 737     }
 738     if (zip != NULL && error_msg == NULL) {
 739       new_entry = new ClassPathZipEntry(zip, path);



 740     } else {
 741       ResourceMark rm(thread);
 742       char *msg;
 743       if (error_msg == NULL) {
 744         msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 745         jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 746       } else {
 747         int len = (int)(strlen(path) + strlen(error_msg) + 128);
 748         msg = NEW_RESOURCE_ARRAY(char, len); ;
 749         jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 750       }
 751       if (throw_exception) {
 752         THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 753       } else {
 754         return NULL;
 755       }
 756     }
 757     }
 758     if (TraceClassLoading || TraceClassPaths) {
 759       tty->print_cr("[Opened %s]", path);
 760     }
 761   } else  {
 762     // Directory
 763     new_entry = new ClassPathDirEntry(path);
 764     if (TraceClassLoading) {
 765       tty->print_cr("[Path %s]", path);
 766     }
 767   }
 768   return new_entry;
 769 }
 770 
 771 
 772 // Create a class path zip entry for a given path (return NULL if not found
 773 // or zip/JAR file cannot be opened)
 774 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
 775   // check for a regular file
 776   struct stat st;
 777   if (os::stat(path, &st) == 0) {
 778     if ((st.st_mode & S_IFREG) == S_IFREG) {
 779       char canonical_path[JVM_MAXPATHLEN];
 780       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 781         char* error_msg = NULL;
 782         jzfile* zip;
 783         {
 784           // enable call to C land
 785           JavaThread* thread = JavaThread::current();
 786           ThreadToNativeFromVM ttn(thread);
 787           HandleMark hm(thread);
 788           zip = (*ZipOpen)(canonical_path, &error_msg);
 789         }
 790         if (zip != NULL && error_msg == NULL) {
 791           // create using canonical path
 792           return new ClassPathZipEntry(zip, canonical_path);
 793         }
 794       }
 795     }
 796   }
 797   return NULL;
 798 }
 799 
 800 // returns true if entry already on class path
 801 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 802   ClassPathEntry* e = _first_entry;
 803   while (e != NULL) {
 804     // assume zip entries have been canonicalized
 805     if (strcmp(entry->name(), e->name()) == 0) {
 806       return true;
 807     }
 808     e = e->next();
 809   }
 810   return false;
 811 }
 812 
 813 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 814   if (new_entry != NULL) {
 815     if (_last_entry == NULL) {
 816       _first_entry = _last_entry = new_entry;
 817     } else {
 818       _last_entry->set_next(new_entry);
 819       _last_entry = new_entry;
 820     }
 821   }
 822   _num_entries ++;
 823 }
 824 
 825 // Returns true IFF the file/dir exists and the entry was successfully created.
 826 bool ClassLoader::update_class_path_entry_list(const char *path,
 827                                                bool check_for_duplicates,
 828                                                bool throw_exception) {
 829   struct stat st;
 830   if (os::stat(path, &st) == 0) {
 831     // File or directory found
 832     ClassPathEntry* new_entry = NULL;
 833     Thread* THREAD = Thread::current();
 834     new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
 835     if (new_entry == NULL) {
 836       return false;
 837     }
 838     // The kernel VM adds dynamically to the end of the classloader path and
 839     // doesn't reorder the bootclasspath which would break java.lang.Package
 840     // (see PackageInfo).
 841     // Add new entry to linked list
 842     if (!check_for_duplicates || !contains_entry(new_entry)) {
 843       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
 844     }
 845     return true;
 846   } else {
 847 #if INCLUDE_CDS
 848     if (DumpSharedSpaces) {
 849       _shared_paths_misc_info->add_nonexist_path(path);
 850     }
 851 #endif
 852     return false;
 853   }
 854 }
 855 
 856 void ClassLoader::print_bootclasspath() {
 857   ClassPathEntry* e = _first_entry;
 858   tty->print("[bootclasspath= ");
 859   while (e != NULL) {
 860     tty->print("%s ;", e->name());
 861     e = e->next();
 862   }
 863   tty->print_cr("]");
 864 }
 865 
 866 void ClassLoader::load_zip_library() {
 867   assert(ZipOpen == NULL, "should not load zip library twice");
 868   // First make sure native library is loaded
 869   os::native_java_library();
 870   // Load zip library
 871   char path[JVM_MAXPATHLEN];
 872   char ebuf[1024];
 873   void* handle = NULL;
 874   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 875     handle = os::dll_load(path, ebuf, sizeof ebuf);
 876   }
 877   if (handle == NULL) {
 878     vm_exit_during_initialization("Unable to load ZIP library", path);
 879   }
 880   // Lookup zip entry points
 881   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 882   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 883   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 884   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 885   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 886   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 887   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 888   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 889 
 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 Error: 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 
1464 bool ClassPathDirEntry::is_jrt() {
1465   return false;
1466 }
1467 
1468 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1469   real_jzfile* zip = (real_jzfile*) _zip;
1470   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1471   tty->cr();
1472   // Iterate over all entries in zip file
1473   for (int n = 0; ; n++) {
1474     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1475     if (ze == NULL) break;
1476     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1477   }
1478   if (HAS_PENDING_EXCEPTION) {
1479     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1480       CLEAR_PENDING_EXCEPTION;
1481       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1482       tty->print_cr("Increase class metadata storage if a limit was set");
1483     } else {
1484       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1485     }
1486   }
1487 }
1488 
1489 bool ClassPathZipEntry::is_jrt() {
1490   real_jzfile* zip = (real_jzfile*) _zip;
1491   int len = (int)strlen(zip->name);
1492   // Check whether zip name ends in "rt.jar"
1493   // This will match other archives named rt.jar as well, but this is
1494   // only used for debugging.
1495   return string_ends_with(zip->name, "rt.jar");
1496 }
1497 
1498 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1499   ClassPathEntry* cpe = resolve_entry(THREAD);
1500   if (cpe != NULL) {
1501     cpe->compile_the_world(loader, CHECK);
1502   }
1503 }
1504 
1505 bool LazyClassPathEntry::is_jrt() {
1506   Thread* THREAD = Thread::current();
1507   ClassPathEntry* cpe = resolve_entry(THREAD);
1508   return (cpe != NULL) ? cpe->is_jar_file() : false;
1509 }
1510 
1511 void ClassLoader::compile_the_world() {
1512   EXCEPTION_MARK;
1513   HandleMark hm(THREAD);
1514   ResourceMark rm(THREAD);
1515   // Make sure we don't run with background compilation
1516   BackgroundCompilation = false;
1517   // Find bootstrap loader
1518   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1519   // Iterate over all bootstrap class path entries
1520   ClassPathEntry* e = _first_entry;
1521   jlong start = os::javaTimeMillis();
1522   while (e != NULL) {
1523     // We stop at rt.jar, unless it is the first bootstrap path entry
1524     if (e->is_jrt() && e != _first_entry) break;
1525     e->compile_the_world(system_class_loader, CATCH);
1526     e = e->next();
1527   }
1528   jlong end = os::javaTimeMillis();
1529   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1530                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1531   {
1532     // Print statistics as if before normal exit:
1533     extern void print_statistics();
1534     print_statistics();
1535   }
1536   vm_exit(0);
1537 }
1538 
1539 int ClassLoader::_compile_the_world_class_counter = 0;
1540 int ClassLoader::_compile_the_world_method_counter = 0;
1541 static int _codecache_sweep_counter = 0;
1542 
1543 // Filter out all exceptions except OOMs
1544 static void clear_pending_exception_if_not_oom(TRAPS) {
1545   if (HAS_PENDING_EXCEPTION &&
1546       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1547     CLEAR_PENDING_EXCEPTION;
1548   }
1549   // The CHECK at the caller will propagate the exception out
1550 }
1551 
1552 /**
1553  * Returns if the given method should be compiled when doing compile-the-world.
1554  *
1555  * TODO:  This should be a private method in a CompileTheWorld class.
1556  */
1557 static bool can_be_compiled(methodHandle m, int comp_level) {
1558   assert(CompileTheWorld, "must be");
1559 
1560   // It's not valid to compile a native wrapper for MethodHandle methods
1561   // that take a MemberName appendix since the bytecode signature is not
1562   // correct.
1563   vmIntrinsics::ID iid = m->intrinsic_id();
1564   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1565     return false;
1566   }
1567 
1568   return CompilationPolicy::can_be_compiled(m, comp_level);
1569 }
1570 
1571 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1572   if (string_ends_with(name, ".class")) {

1573     // We have a .class file
1574     int len = (int)strlen(name);
1575     char buffer[2048];
1576     strncpy(buffer, name, len - 6);
1577     buffer[len-6] = 0;
1578     // If the file has a period after removing .class, it's not really a
1579     // valid class file.  The class loader will check everything else.
1580     if (strchr(buffer, '.') == NULL) {
1581       _compile_the_world_class_counter++;
1582       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1583 
1584       // Construct name without extension
1585       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1586       // Use loader to load and initialize class
1587       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1588       instanceKlassHandle k (THREAD, ik);
1589       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1590         k->initialize(THREAD);
1591       }
1592       bool exception_occurred = HAS_PENDING_EXCEPTION;
1593       clear_pending_exception_if_not_oom(CHECK);
1594       if (CompileTheWorldPreloadClasses && k.not_null()) {
1595         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1596         if (HAS_PENDING_EXCEPTION) {
1597           // If something went wrong in preloading we just ignore it
1598           clear_pending_exception_if_not_oom(CHECK);
1599           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1600         }
1601       }
1602 
1603       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1604         if (k.is_null() || exception_occurred) {
1605           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1606           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1607         } else {
1608           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1609           // Preload all classes to get around uncommon traps
1610           // Iterate over all methods in class
1611           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1612           for (int n = 0; n < k->methods()->length(); n++) {
1613             methodHandle m (THREAD, k->methods()->at(n));
1614             if (can_be_compiled(m, comp_level)) {
1615               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1616                 // Give sweeper a chance to keep up with CTW
1617                 VM_ForceSafepoint op;
1618                 VMThread::execute(&op);
1619                 _codecache_sweep_counter = 0;
1620               }
1621               // Force compilation
1622               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1623                                             methodHandle(), 0, "CTW", THREAD);
1624               if (HAS_PENDING_EXCEPTION) {
1625                 clear_pending_exception_if_not_oom(CHECK);
1626                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1627               } else {
1628                 _compile_the_world_method_counter++;
1629               }
1630               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1631                 // Clobber the first compile and force second tier compilation
1632                 nmethod* nm = m->code();
1633                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1634                   // Throw out the code so that the code cache doesn't fill up
1635                   nm->make_not_entrant();
1636                   m->clear_code();
1637                 }
1638                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1639                                               methodHandle(), 0, "CTW", THREAD);
1640                 if (HAS_PENDING_EXCEPTION) {
1641                   clear_pending_exception_if_not_oom(CHECK);
1642                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1643                 } else {
1644                   _compile_the_world_method_counter++;
1645                 }
1646               }
1647             } else {
1648               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1649             }
1650 
1651             nmethod* nm = m->code();
1652             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1653               // Throw out the code so that the code cache doesn't fill up
1654               nm->make_not_entrant();
1655               m->clear_code();
1656             }
1657           }
1658         }
1659       }
1660     }
1661   }
1662 }
1663 
1664 #endif //PRODUCT
1665 
1666 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1667 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1668 void PerfClassTraceTime::initialize() {
1669   if (!UsePerfData) return;
1670 
1671   if (_eventp != NULL) {
1672     // increment the event counter
1673     _eventp->inc();
1674   }
1675 
1676   // stop the current active thread-local timer to measure inclusive time
1677   _prev_active_event = -1;
1678   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1679      if (_timers[i].is_active()) {
1680        assert(_prev_active_event == -1, "should have only one active timer");
1681        _prev_active_event = i;
1682        _timers[i].stop();
1683      }
1684   }
1685 
1686   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1687     // start the inclusive timer if not recursively called
1688     _t.start();
1689   }
1690 
1691   // start thread-local timer of the given event type
1692    if (!_timers[_event_type].is_active()) {
1693     _timers[_event_type].start();
1694   }
1695 }
1696 
1697 PerfClassTraceTime::~PerfClassTraceTime() {
1698   if (!UsePerfData) return;
1699 
1700   // stop the thread-local timer as the event completes
1701   // and resume the thread-local timer of the event next on the stack
1702   _timers[_event_type].stop();
1703   jlong selftime = _timers[_event_type].ticks();
1704 
1705   if (_prev_active_event >= 0) {
1706     _timers[_prev_active_event].start();
1707   }
1708 
1709   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1710 
1711   // increment the counters only on the leaf call
1712   _t.stop();
1713   _timep->inc(_t.ticks());
1714   if (_selftimep != NULL) {
1715     _selftimep->inc(selftime);
1716   }
1717   // add all class loading related event selftime to the accumulated time counter
1718   ClassLoader::perf_accumulated_time()->inc(selftime);
1719 
1720   // reset the timer
1721   _timers[_event_type].reset();
1722 }
--- EOF ---