1 /*
   2  * Copyright (c) 1997, 2016, 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/classFileStream.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/classLoaderExt.hpp"
  30 #include "classfile/javaClasses.hpp"
  31 #include "classfile/jimage.hpp"
  32 #include "classfile/moduleEntry.hpp"
  33 #include "classfile/modules.hpp"
  34 #include "classfile/packageEntry.hpp"
  35 #include "classfile/klassFactory.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/vmSymbols.hpp"
  38 #include "compiler/compileBroker.hpp"
  39 #include "gc/shared/collectedHeap.inline.hpp"
  40 #include "gc/shared/generation.hpp"
  41 #include "interpreter/bytecodeStream.hpp"
  42 #include "interpreter/oopMapCache.hpp"
  43 #include "logging/logTag.hpp"
  44 #include "memory/allocation.inline.hpp"
  45 #include "memory/filemap.hpp"
  46 #include "memory/oopFactory.hpp"
  47 #include "memory/resourceArea.hpp"
  48 #include "memory/universe.inline.hpp"
  49 #include "oops/instanceKlass.hpp"
  50 #include "oops/instanceRefKlass.hpp"
  51 #include "oops/objArrayOop.inline.hpp"
  52 #include "oops/oop.inline.hpp"
  53 #include "oops/symbol.hpp"
  54 #include "prims/jvm_misc.hpp"
  55 #include "runtime/arguments.hpp"
  56 #include "runtime/compilationPolicy.hpp"
  57 #include "runtime/fprofiler.hpp"
  58 #include "runtime/handles.hpp"
  59 #include "runtime/handles.inline.hpp"
  60 #include "runtime/init.hpp"
  61 #include "runtime/interfaceSupport.hpp"
  62 #include "runtime/java.hpp"
  63 #include "runtime/javaCalls.hpp"
  64 #include "runtime/os.hpp"
  65 #include "runtime/threadCritical.hpp"
  66 #include "runtime/timer.hpp"
  67 #include "runtime/vm_version.hpp"
  68 #include "services/management.hpp"
  69 #include "services/threadService.hpp"
  70 #include "utilities/events.hpp"
  71 #include "utilities/hashtable.inline.hpp"
  72 #include "utilities/macros.hpp"
  73 #if INCLUDE_CDS
  74 #include "classfile/sharedClassUtil.hpp"
  75 #include "classfile/sharedPathsMiscInfo.hpp"
  76 #endif
  77 
  78 // Entry points in zip.dll for loading zip/jar file entries
  79 
  80 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  81 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  82 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  83 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  84 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  85 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  86 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  87 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  88 
  89 static ZipOpen_t         ZipOpen            = NULL;
  90 static ZipClose_t        ZipClose           = NULL;
  91 static FindEntry_t       FindEntry          = NULL;
  92 static ReadEntry_t       ReadEntry          = NULL;
  93 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  94 static GetNextEntry_t    GetNextEntry       = NULL;
  95 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  96 static ZipInflateFully_t ZipInflateFully    = NULL;
  97 static Crc32_t           Crc32              = NULL;
  98 
  99 // Entry points for jimage.dll for loading jimage file entries
 100 
 101 static JImageOpen_t                    JImageOpen                    = NULL;
 102 static JImageClose_t                   JImageClose                   = NULL;
 103 static JImagePackageToModule_t         JImagePackageToModule         = NULL;
 104 static JImageFindResource_t            JImageFindResource            = NULL;
 105 static JImageGetResource_t             JImageGetResource             = NULL;
 106 static JImageResourceIterator_t        JImageResourceIterator        = NULL;
 107 
 108 // Globals
 109 
 110 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 111 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 112 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 113 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 114 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 115 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 116 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 117 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 118 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 119 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 120 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 121 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 122 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 123 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 124 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 125 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 126 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 127 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 128 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 129 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 130 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 131 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 132 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 133 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 134 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 135 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 136 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 137 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 138 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 139 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 140 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 141 
 142 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 143 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 144 int             ClassLoader::_num_entries         = 0;
 145 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
 146 bool            ClassLoader::_has_jimage = false;
 147 #if INCLUDE_CDS
 148 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
 149 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
 150 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 151 #endif
 152 
 153 // helper routines
 154 bool string_starts_with(const char* str, const char* str_to_find) {
 155   size_t str_len = strlen(str);
 156   size_t str_to_find_len = strlen(str_to_find);
 157   if (str_to_find_len > str_len) {
 158     return false;
 159   }
 160   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 161 }
 162 
 163 static const char* get_jimage_version_string() {
 164   static char version_string[10] = "";
 165   if (version_string[0] == '\0') {
 166     jio_snprintf(version_string, sizeof(version_string), "%d.%d",
 167                  Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
 168   }
 169   return (const char*)version_string;
 170 }
 171 
 172 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
 173   size_t str_len = strlen(str);
 174   size_t str_to_find_len = strlen(str_to_find);
 175   if (str_to_find_len > str_len) {
 176     return false;
 177   }
 178   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 179 }
 180 
 181 
 182 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 183   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 184   strcpy(copy, dir);
 185   _dir = copy;
 186 }
 187 
 188 
 189 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 190   // construct full path name
 191   char path[JVM_MAXPATHLEN];
 192   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 193     return NULL;
 194   }
 195   // check if file exists
 196   struct stat st;
 197   if (os::stat(path, &st) == 0) {
 198 #if INCLUDE_CDS
 199     if (DumpSharedSpaces) {
 200       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 201       // we should never find a file underneath it -- unless user has added a new file while we are running
 202       // the dump, in which case let's quit!
 203       ShouldNotReachHere();
 204     }
 205 #endif
 206     // found file, open it
 207     int file_handle = os::open(path, 0, 0);
 208     if (file_handle != -1) {
 209       // read contents into resource array
 210       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 211       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 212       // close file
 213       os::close(file_handle);
 214       // construct ClassFileStream
 215       if (num_read == (size_t)st.st_size) {
 216         if (UsePerfData) {
 217           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 218         }
 219         // Resource allocated
 220         return new ClassFileStream(buffer,
 221                                    st.st_size,
 222                                    _dir,
 223                                    ClassFileStream::verify);
 224       }
 225     }
 226   }
 227   return NULL;
 228 }
 229 
 230 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
 231   _zip = zip;
 232   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 233   strcpy(copy, zip_name);
 234   _zip_name = copy;
 235   _is_boot_append = is_boot_append;
 236   _multi_versioned = _unknown;
 237 }
 238 
 239 ClassPathZipEntry::~ClassPathZipEntry() {
 240   if (ZipClose != NULL) {
 241     (*ZipClose)(_zip);
 242   }
 243   FREE_C_HEAP_ARRAY(char, _zip_name);
 244 }
 245 
 246 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 247     // enable call to C land
 248   JavaThread* thread = JavaThread::current();
 249   ThreadToNativeFromVM ttn(thread);
 250   // check whether zip archive contains name
 251   jint name_len;
 252   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 253   if (entry == NULL) return NULL;
 254   u1* buffer;
 255   char name_buf[128];
 256   char* filename;
 257   if (name_len < 128) {
 258     filename = name_buf;
 259   } else {
 260     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 261   }
 262 
 263   // file found, get pointer to the entry in mmapped jar file.
 264   if (ReadMappedEntry == NULL ||
 265       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 266       // mmapped access not available, perhaps due to compression,
 267       // read contents into resource array
 268       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 269       buffer = NEW_RESOURCE_ARRAY(u1, size);
 270       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 271   }
 272 
 273   // return result
 274   if (nul_terminate) {
 275     buffer[*filesize] = 0;
 276   }
 277   return buffer;
 278 }
 279 
 280 #if INCLUDE_CDS
 281 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
 282   u1* buffer = NULL;
 283   if (!_is_boot_append) {
 284     assert(DumpSharedSpaces, "Should be called only for non-boot entries during dump time");
 285     // We presume default is multi-release enabled
 286     const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
 287     const char* verstr = Arguments::get_property("jdk.util.jar.version");
 288     bool is_multi_ver = (multi_ver == NULL ||
 289                          strcmp(multi_ver, "true") == 0 ||
 290                          strcmp(multi_ver, "force")  == 0) &&
 291                          is_multiple_versioned(THREAD);
 292     // command line version setting
 293     int version = 0;
 294     const int base_version = 8; // JDK8
 295     int cur_ver = JDK_Version::current().major_version();
 296     if (verstr != NULL) {
 297       version = atoi(verstr);
 298       if (version < base_version || version > cur_ver) {
 299         is_multi_ver = false;
 300         // print out warning, do not use assertion here since it will continue to look
 301         // for proper version.
 302         warning("JDK%d is not supported in multiple version jars", version);
 303       }
 304     }
 305 
 306     if (is_multi_ver) {
 307       int n;
 308       char entry_name[JVM_MAXPATHLEN];
 309       if (version > 0) {
 310         jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", version, name);
 311         buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 312         if (buffer == NULL) {
 313           warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
 314         }
 315       }
 316       if (buffer == NULL) {
 317         for (int i = cur_ver; i >= base_version; i--) {
 318           jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", i, name);
 319           buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 320           if (buffer != NULL) {
 321             break;
 322           }
 323         }
 324       }
 325     }
 326   }
 327   return buffer;
 328 }
 329 
 330 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
 331   assert(DumpSharedSpaces, "called only at dump time");
 332   if (_multi_versioned != _unknown) {
 333     return (_multi_versioned == _yes) ? true : false;
 334   }
 335   jint size;
 336   char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
 337   if (buffer != NULL) {
 338     char* p = buffer;
 339     for ( ; *p; ++p) *p = tolower(*p);
 340     if (strstr(buffer, "multi-release: true") != NULL) {
 341       _multi_versioned = _yes;
 342       return true;
 343     }
 344   }
 345   _multi_versioned = _no;
 346   return false;
 347 }
 348 #endif // INCLUDE_CDS
 349 
 350 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 351   jint filesize;
 352   u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
 353   if (buffer == NULL) {
 354     buffer = open_entry(name, &filesize, false, CHECK_NULL);
 355     if (buffer == NULL) {
 356       return NULL;
 357     }
 358   }
 359   if (UsePerfData) {
 360     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 361   }
 362   // Resource allocated
 363   return new ClassFileStream(buffer,
 364                              filesize,
 365                              _zip_name,
 366                              ClassFileStream::verify);
 367 }
 368 
 369 // invoke function for each entry in the zip file
 370 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 371   JavaThread* thread = JavaThread::current();
 372   HandleMark  handle_mark(thread);
 373   ThreadToNativeFromVM ttn(thread);
 374   for (int n = 0; ; n++) {
 375     jzentry * ze = ((*GetNextEntry)(_zip, n));
 376     if (ze == NULL) break;
 377     (*f)(ze->name, context);
 378   }
 379 }
 380 
 381 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
 382   ClassPathEntry(),
 383   _jimage(jimage) {
 384   guarantee(jimage != NULL, "jimage file is null");
 385   guarantee(name != NULL, "jimage file name is null");
 386   size_t len = strlen(name) + 1;
 387   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 388   strncpy((char *)_name, name, len);
 389 }
 390 
 391 ClassPathImageEntry::~ClassPathImageEntry() {
 392   if (_name != NULL) {
 393     FREE_C_HEAP_ARRAY(const char, _name);
 394     _name = NULL;
 395   }
 396   if (_jimage != NULL) {
 397     (*JImageClose)(_jimage);
 398     _jimage = NULL;
 399   }
 400 }
 401 
 402 void ClassPathImageEntry::name_to_package(const char* name, char* buffer, int length) {
 403   const char *pslash = strrchr(name, '/');
 404   if (pslash == NULL) {
 405     buffer[0] = '\0';
 406     return;
 407   }
 408   int len = pslash - name;
 409 #if INCLUDE_CDS
 410   if (len <= 0 && DumpSharedSpaces) {
 411     buffer[0] = '\0';
 412     return;
 413   }
 414 #endif
 415   assert(len > 0, "Bad length for package name");
 416   if (len >= length) {
 417     buffer[0] = '\0';
 418     return;
 419   }
 420   // drop name after last slash (including slash)
 421   // Ex., "java/lang/String.class" => "java/lang"
 422   strncpy(buffer, name, len);
 423   // ensure string termination (strncpy does not guarantee)
 424   buffer[len] = '\0';
 425 }
 426 
 427 // For a class in a named module, look it up in the jimage file using this syntax:
 428 //    /<module-name>/<package-name>/<base-class>
 429 //
 430 // Assumptions:
 431 //     1. There are no unnamed modules in the jimage file.
 432 //     2. A package is in at most one module in the jimage file.
 433 //
 434 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 435   jlong size;
 436   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 437 
 438   if (location == 0) {
 439     char package[JIMAGE_MAX_PATH];
 440     name_to_package(name, package, JIMAGE_MAX_PATH);
 441 
 442 #if INCLUDE_CDS
 443     if (package[0] == '\0' && DumpSharedSpaces) {
 444       return NULL;
 445     }
 446 #endif
 447     if (package[0] != '\0') {
 448       if (!Universe::is_module_initialized()) {
 449         location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size);
 450 #if INCLUDE_CDS
 451         // CDS uses the boot class loader to load classes whose packages are in
 452         // modules defined for other class loaders.  So, for now, get their module
 453         // names from the "modules" jimage file.
 454         if (DumpSharedSpaces && location == 0) {
 455           const char* module_name = (*JImagePackageToModule)(_jimage, package);
 456           if (module_name != NULL) {
 457             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 458           }
 459         }
 460 #endif
 461 
 462       } else {
 463         // Get boot class loader's package entry table
 464         PackageEntryTable* pkgEntryTable =
 465           ClassLoaderData::the_null_class_loader_data()->packages();
 466         // Get package's package entry
 467         TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package, CHECK_NULL);
 468         PackageEntry* package_entry = pkgEntryTable->lookup_only(pkg_symbol);
 469 
 470         if (package_entry != NULL) {
 471           ResourceMark rm;
 472           // Get the module name
 473           ModuleEntry* module = package_entry->module();
 474           assert(module != NULL, "Boot classLoader package missing module");
 475           assert(module->is_named(), "Boot classLoader package is in unnamed module");
 476           const char* module_name = module->name()->as_C_string();
 477           if (module_name != NULL) {
 478             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 479           }
 480         }
 481       }
 482     }
 483   }
 484   if (location != 0) {
 485     if (UsePerfData) {
 486       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 487     }
 488     char* data = NEW_RESOURCE_ARRAY(char, size);
 489     (*JImageGetResource)(_jimage, location, data, size);
 490     // Resource allocated
 491     return new ClassFileStream((u1*)data,
 492                                (int)size,
 493                                _name,
 494                                ClassFileStream::verify);
 495   }
 496 
 497   return NULL;
 498 }
 499 
 500 #ifndef PRODUCT
 501 bool ctw_visitor(JImageFile* jimage,
 502         const char* module_name, const char* version, const char* package,
 503         const char* name, const char* extension, void* arg) {
 504   if (strcmp(extension, "class") == 0) {
 505     Thread* THREAD = Thread::current();
 506     char path[JIMAGE_MAX_PATH];
 507     jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
 508     ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
 509     return !HAS_PENDING_EXCEPTION;
 510   }
 511   return true;
 512 }
 513 
 514 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 515   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 516   tty->cr();
 517   (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
 518   if (HAS_PENDING_EXCEPTION) {
 519     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 520       CLEAR_PENDING_EXCEPTION;
 521       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 522       tty->print_cr("Increase class metadata storage if a limit was set");
 523     } else {
 524       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 525     }
 526   }
 527 }
 528 #endif
 529 
 530 bool ClassPathImageEntry::is_jrt() {
 531   return ClassLoader::is_jrt(name());
 532 }
 533 
 534 #if INCLUDE_CDS
 535 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 536   assert(DumpSharedSpaces, "only called at dump time");
 537   tty->print_cr("Hint: enable -Xlog:classpath=info to diagnose the failure");
 538   vm_exit_during_initialization(error, message);
 539 }
 540 #endif
 541 
 542 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 543   if (log_is_enabled(Info, classpath)) {
 544     ResourceMark rm;
 545     outputStream* out = Log(classpath)::info_stream();
 546     if (msg) {
 547       out->print("%s", msg);
 548     }
 549     if (name) {
 550       if (strlen(name) < 256) {
 551         out->print("%s", name);
 552       } else {
 553         // For very long paths, we need to print each character separately,
 554         // as print_cr() has a length limit
 555         while (name[0] != '\0') {
 556           out->print("%c", name[0]);
 557           name++;
 558         }
 559       }
 560     }
 561     out->cr();
 562   }
 563 }
 564 
 565 #if INCLUDE_CDS
 566 void ClassLoader::check_shared_classpath(const char *path) {
 567   if (strcmp(path, "") == 0) {
 568     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 569   }
 570 
 571   struct stat st;
 572   if (os::stat(path, &st) == 0) {
 573     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 574       if (!os::dir_is_empty(path)) {
 575         tty->print_cr("Error: non-empty directory '%s'", path);
 576         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 577       }
 578     }
 579   }
 580 }
 581 #endif
 582 
 583 void ClassLoader::setup_bootstrap_search_path() {
 584   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 585   const char* sys_class_path = Arguments::get_sysclasspath();
 586   const char* java_class_path = Arguments::get_appclasspath();
 587   if (PrintSharedArchiveAndExit) {
 588     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 589     // the same as the bootcp of the shared archive.
 590   } else {
 591     trace_class_path("bootstrap loader class path=", sys_class_path);
 592     trace_class_path("classpath: ", java_class_path);
 593   }
 594 #if INCLUDE_CDS
 595   if (DumpSharedSpaces) {
 596     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 597   }
 598 #endif
 599   setup_search_path(sys_class_path, true);
 600 }
 601 
 602 #if INCLUDE_CDS
 603 int ClassLoader::get_shared_paths_misc_info_size() {
 604   return _shared_paths_misc_info->get_used_bytes();
 605 }
 606 
 607 void* ClassLoader::get_shared_paths_misc_info() {
 608   return _shared_paths_misc_info->buffer();
 609 }
 610 
 611 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 612   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 613   bool result = checker->check();
 614   delete checker;
 615   return result;
 616 }
 617 #endif
 618 
 619 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
 620   int offset = 0;
 621   int len = (int)strlen(class_path);
 622   int end = 0;
 623   bool mark_append_entry = false;
 624 
 625   // Iterate over class path entries
 626   for (int start = 0; start < len; start = end) {
 627     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 628       end++;
 629     }
 630     EXCEPTION_MARK;
 631     ResourceMark rm(THREAD);
 632     mark_append_entry = (mark_append_entry ||
 633       (bootstrap_search && (start == Arguments::bootclassloader_append_index())));
 634     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 635     strncpy(path, &class_path[start], end - start);
 636     path[end - start] = '\0';
 637     update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search);
 638 
 639     // Check on the state of the boot loader's append path
 640     if (mark_append_entry && (_first_append_entry == NULL)) {
 641       // Failure to mark the first append entry, most likely
 642       // due to a non-existent path. Record the next entry
 643       // as the first boot loader append entry.
 644       mark_append_entry = true;
 645     } else {
 646       mark_append_entry = false;
 647     }
 648 
 649 #if INCLUDE_CDS
 650     if (DumpSharedSpaces) {
 651       check_shared_classpath(path);
 652     }
 653 #endif
 654     while (class_path[end] == os::path_separator()[0]) {
 655       end++;
 656     }
 657   }
 658 }
 659 
 660 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 661                                                      bool throw_exception,
 662                                                      bool is_boot_append, TRAPS) {
 663   JavaThread* thread = JavaThread::current();
 664   ClassPathEntry* new_entry = NULL;
 665   if ((st->st_mode & S_IFREG) == S_IFREG) {
 666     // Regular file, should be a zip or jimage file
 667     // Canonicalized filename
 668     char canonical_path[JVM_MAXPATHLEN];
 669     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 670       // This matches the classic VM
 671       if (throw_exception) {
 672         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 673       } else {
 674         return NULL;
 675       }
 676     }
 677     jint error;
 678     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 679     if (jimage != NULL) {
 680       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 681     } else {
 682       char* error_msg = NULL;
 683       jzfile* zip;
 684       {
 685         // enable call to C land
 686         ThreadToNativeFromVM ttn(thread);
 687         HandleMark hm(thread);
 688         zip = (*ZipOpen)(canonical_path, &error_msg);
 689       }
 690       if (zip != NULL && error_msg == NULL) {
 691         new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
 692       } else {
 693         ResourceMark rm(thread);
 694         char *msg;
 695         if (error_msg == NULL) {
 696           msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 697           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 698         } else {
 699           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 700           msg = NEW_RESOURCE_ARRAY(char, len); ;
 701           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 702         }
 703         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 704         if (throw_exception && is_init_completed()) {
 705           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 706         } else {
 707           return NULL;
 708         }
 709       }
 710     }
 711     log_info(classpath)("opened: %s", path);
 712     log_info(classload)("opened: %s", path);
 713   } else {
 714     // Directory
 715     new_entry = new ClassPathDirEntry(path);
 716     log_info(classload)("path: %s", path);
 717   }
 718   return new_entry;
 719 }
 720 
 721 
 722 // Create a class path zip entry for a given path (return NULL if not found
 723 // or zip/JAR file cannot be opened)
 724 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
 725   // check for a regular file
 726   struct stat st;
 727   if (os::stat(path, &st) == 0) {
 728     if ((st.st_mode & S_IFREG) == S_IFREG) {
 729       char canonical_path[JVM_MAXPATHLEN];
 730       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 731         char* error_msg = NULL;
 732         jzfile* zip;
 733         {
 734           // enable call to C land
 735           JavaThread* thread = JavaThread::current();
 736           ThreadToNativeFromVM ttn(thread);
 737           HandleMark hm(thread);
 738           zip = (*ZipOpen)(canonical_path, &error_msg);
 739         }
 740         if (zip != NULL && error_msg == NULL) {
 741           // create using canonical path
 742           return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
 743         }
 744       }
 745     }
 746   }
 747   return NULL;
 748 }
 749 
 750 // The boot class loader must adhere to specfic visibility rules.
 751 // Prior to loading a class in a named package, the package is checked
 752 // to see if it is in a module defined to the boot loader. If the
 753 // package is not in a module defined to the boot loader, the class
 754 // must be loaded only in the boot loader's append path, which
 755 // consists of [-Xbootclasspath/a]; [jvmti appended entries]
 756 void ClassLoader::set_first_append_entry(ClassPathEntry *new_entry) {
 757   if (_first_append_entry == NULL) {
 758     _first_append_entry = new_entry;
 759   }
 760 }
 761 
 762 // returns true if entry already on class path
 763 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 764   ClassPathEntry* e = _first_entry;
 765   while (e != NULL) {
 766     // assume zip entries have been canonicalized
 767     if (strcmp(entry->name(), e->name()) == 0) {
 768       return true;
 769     }
 770     e = e->next();
 771   }
 772   return false;
 773 }
 774 
 775 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 776   if (new_entry != NULL) {
 777     if (_last_entry == NULL) {
 778       _first_entry = _last_entry = new_entry;
 779     } else {
 780       _last_entry->set_next(new_entry);
 781       _last_entry = new_entry;
 782     }
 783   }
 784   _num_entries ++;
 785 }
 786 
 787 void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) {
 788   if (new_entry != NULL) {
 789     if (_last_entry == NULL) {
 790       _first_entry = _last_entry = new_entry;
 791     } else {
 792       new_entry->set_next(_first_entry);
 793       _first_entry = new_entry;
 794     }
 795   }
 796   _num_entries ++;
 797 }
 798 
 799 void ClassLoader::add_to_list(const char *apath) {
 800   update_class_path_entry_list((char*)apath, false, false, false, false);
 801 }
 802 
 803 void ClassLoader::prepend_to_list(const char *apath) {
 804   update_class_path_entry_list((char*)apath, false, false, true, false);
 805 }
 806 
 807 // Returns true IFF the file/dir exists and the entry was successfully created.
 808 bool ClassLoader::update_class_path_entry_list(const char *path,
 809                                                bool check_for_duplicates,
 810                                                bool mark_append_entry,
 811                                                bool prepend_entry,
 812                                                bool is_boot_append,
 813                                                bool throw_exception) {
 814   struct stat st;
 815   if (os::stat(path, &st) == 0) {
 816     // File or directory found
 817     ClassPathEntry* new_entry = NULL;
 818     Thread* THREAD = Thread::current();
 819     new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
 820     if (new_entry == NULL) {
 821       return false;
 822     }
 823 
 824     // Ensure that the first boot loader append entry will always be set correctly.
 825     assert((!mark_append_entry ||
 826             (mark_append_entry && (!check_for_duplicates || !contains_entry(new_entry)))),
 827            "failed to mark boot loader's first append boundary");
 828 
 829     // Do not reorder the bootclasspath which would break get_system_package().
 830     // Add new entry to linked list
 831 
 832     if (!check_for_duplicates || !contains_entry(new_entry)) {
 833       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry, prepend_entry);
 834       if (mark_append_entry) {
 835         set_first_append_entry(new_entry);
 836       }
 837     }
 838     return true;
 839   } else {
 840 #if INCLUDE_CDS
 841     if (DumpSharedSpaces) {
 842       _shared_paths_misc_info->add_nonexist_path(path);
 843     }
 844 #endif
 845     return false;
 846   }
 847 }
 848 
 849 void ClassLoader::print_bootclasspath() {
 850   ClassPathEntry* e = _first_entry;
 851   tty->print("[bootclasspath= ");
 852   while (e != NULL) {
 853     tty->print("%s ;", e->name());
 854     e = e->next();
 855   }
 856   tty->print_cr("]");
 857 }
 858 
 859 void ClassLoader::load_zip_library() {
 860   assert(ZipOpen == NULL, "should not load zip library twice");
 861   // First make sure native library is loaded
 862   os::native_java_library();
 863   // Load zip library
 864   char path[JVM_MAXPATHLEN];
 865   char ebuf[1024];
 866   void* handle = NULL;
 867   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 868     handle = os::dll_load(path, ebuf, sizeof ebuf);
 869   }
 870   if (handle == NULL) {
 871     vm_exit_during_initialization("Unable to load ZIP library", path);
 872   }
 873   // Lookup zip entry points
 874   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 875   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 876   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 877   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 878   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 879   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 880   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 881   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 882 
 883   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 884   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
 885       GetNextEntry == NULL || Crc32 == NULL) {
 886     vm_exit_during_initialization("Corrupted ZIP library", path);
 887   }
 888 
 889   if (ZipInflateFully == NULL) {
 890     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
 891   }
 892 
 893   // Lookup canonicalize entry in libjava.dll
 894   void *javalib_handle = os::native_java_library();
 895   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 896   // This lookup only works on 1.3. Do not check for non-null here
 897 }
 898 
 899 void ClassLoader::load_jimage_library() {
 900   // First make sure native library is loaded
 901   os::native_java_library();
 902   // Load jimage library
 903   char path[JVM_MAXPATHLEN];
 904   char ebuf[1024];
 905   void* handle = NULL;
 906   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
 907     handle = os::dll_load(path, ebuf, sizeof ebuf);
 908   }
 909   if (handle == NULL) {
 910     vm_exit_during_initialization("Unable to load jimage library", path);
 911   }
 912 
 913   // Lookup jimage entry points
 914   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
 915   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
 916   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
 917   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
 918   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
 919   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
 920   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
 921   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
 922   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
 923   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
 924   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
 925   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
 926 }
 927 
 928 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
 929   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
 930 }
 931 
 932 int ClassLoader::crc32(int crc, const char* buf, int len) {
 933   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
 934   return (*Crc32)(crc, (const jbyte*)buf, len);
 935 }
 936 
 937 #if INCLUDE_CDS
 938 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
 939   jlong size;
 940   JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size);
 941   if (location == 0) {
 942     vm_exit_during_initialization(
 943       "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
 944   }
 945   char* buffer = NEW_RESOURCE_ARRAY(char, size);
 946   jlong read = (*JImageGetResource)(jimage, location, buffer, size);
 947   if (read != size) {
 948     vm_exit_during_initialization(
 949       "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
 950   }
 951   char* char_buf = (char*)buffer;
 952   int buflen = (int)strlen(char_buf);
 953   char* begin_ptr = char_buf;
 954   char* end_ptr = strchr(begin_ptr, '\n');
 955   bool process_boot_modules = false;
 956   _boot_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 957     GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
 958   _platform_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 959     GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
 960   while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
 961     // Allocate a buffer from the C heap to be appended to the _boot_modules_array
 962     // or the _platform_modules_array.
 963     char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
 964     strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
 965     temp_name[end_ptr - begin_ptr] = '\0';
 966     if (strncmp(temp_name, "BOOT", 4) == 0) {
 967       process_boot_modules = true;
 968       FREE_C_HEAP_ARRAY(char, temp_name);
 969     } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
 970       process_boot_modules = false;
 971       FREE_C_HEAP_ARRAY(char, temp_name);
 972     } else {
 973       // module name
 974       if (process_boot_modules) {
 975         _boot_modules_array->append(temp_name);
 976       } else {
 977         _platform_modules_array->append(temp_name);
 978       }
 979     }
 980     begin_ptr = ++end_ptr;
 981     end_ptr = strchr(begin_ptr, '\n');
 982   }
 983   FREE_RESOURCE_ARRAY(u1, buffer, size);
 984 }
 985 #endif
 986 
 987 // Function add_package extracts the package from the fully qualified class name
 988 // and checks if the package is in the boot loader's package entry table.  If so,
 989 // then it sets the classpath_index in the package entry record.
 990 //
 991 // The classpath_index field is used to find the entry on the boot loader class
 992 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
 993 // in an unnamed module.  It is also used to indicate (for all packages whose
 994 // classes are loaded by the boot loader) that at least one of the package's
 995 // classes has been loaded.
 996 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
 997   assert(fullq_class_name != NULL, "just checking");
 998 
 999   // Get package name from fully qualified class name.
1000   const char *cp = strrchr(fullq_class_name, '/');
1001   if (cp != NULL) {
1002     int len = cp - fullq_class_name;
1003     PackageEntryTable* pkg_entry_tbl =
1004       ClassLoaderData::the_null_class_loader_data()->packages();
1005     TempNewSymbol pkg_symbol =
1006       SymbolTable::new_symbol(fullq_class_name, len, CHECK_false);
1007     PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1008     if (pkg_entry != NULL) {
1009       assert(classpath_index != -1, "Unexpected classpath_index");
1010       pkg_entry->set_classpath_index(classpath_index);
1011     } else {
1012       return false;
1013     }
1014   }
1015   return true;
1016 }
1017 
1018 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1019   // Look up the name in the boot loader's package entry table.
1020   if (name != NULL) {
1021     TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1022     // Look for the package entry in the boot loader's package entry table.
1023     PackageEntry* package =
1024       ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1025 
1026     // Return NULL if package does not exist or if no classes in that package
1027     // have been loaded.
1028     if (package != NULL && package->has_loaded_class()) {
1029       ModuleEntry* module = package->module();
1030       if (module->location() != NULL) {
1031         ResourceMark rm(THREAD);
1032         Handle ml = java_lang_String::create_from_str(
1033           module->location()->as_C_string(), THREAD);
1034         return ml();
1035       }
1036       // Return entry on boot loader class path.
1037       Handle cph = java_lang_String::create_from_str(
1038         ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1039       return cph();
1040     }
1041   }
1042   return NULL;
1043 }
1044 
1045 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1046   ResourceMark rm(THREAD);
1047   // List of pointers to PackageEntrys that have loaded classes.
1048   GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1049   {
1050     MutexLocker ml(Module_lock, THREAD);
1051 
1052     PackageEntryTable* pe_table =
1053       ClassLoaderData::the_null_class_loader_data()->packages();
1054 
1055     // Collect the packages that have at least one loaded class.
1056     for (int x = 0; x < pe_table->table_size(); x++) {
1057       for (PackageEntry* package_entry = pe_table->bucket(x);
1058            package_entry != NULL;
1059            package_entry = package_entry->next()) {
1060         if (package_entry->has_loaded_class()) {
1061           loaded_class_pkgs->append(package_entry);
1062         }
1063       }
1064     }
1065   }
1066 
1067 
1068   // Allocate objArray and fill with java.lang.String
1069   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1070                                            loaded_class_pkgs->length(), CHECK_NULL);
1071   objArrayHandle result(THREAD, r);
1072   for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1073     PackageEntry* package_entry = loaded_class_pkgs->at(x);
1074     Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1075     result->obj_at_put(x, str());
1076   }
1077   return result();
1078 }
1079 
1080 #if INCLUDE_CDS
1081 s2 ClassLoader::module_to_classloader(const char* module_name) {
1082 
1083   assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1084   assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1085 
1086   int array_size = _boot_modules_array->length();
1087   for (int i = 0; i < array_size; i++) {
1088     if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1089       return BOOT_LOADER;
1090     }
1091   }
1092 
1093   array_size = _platform_modules_array->length();
1094   for (int i = 0; i < array_size; i++) {
1095     if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1096       return PLATFORM_LOADER;
1097     }
1098   }
1099 
1100   return APP_LOADER;
1101 }
1102 #endif
1103 
1104 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e,
1105                                      int classpath_index, TRAPS) {
1106 #if INCLUDE_CDS
1107   // obtain the classloader type based on the class name.
1108   // First obtain the package name based on the class name. Then obtain
1109   // the classloader type based on the package name from the jimage using
1110   // a jimage API. If the classloader type cannot be found from the
1111   // jimage, it is determined by the class path entry.
1112   jshort loader_type = ClassLoader::APP_LOADER;
1113   if (e->is_jrt()) {
1114     int length = 0;
1115     const jbyte* pkg_string = InstanceKlass::package_from_name(class_name, length);
1116     if (pkg_string != NULL) {
1117       ResourceMark rm;
1118       TempNewSymbol pkg_name = SymbolTable::new_symbol((const char*)pkg_string, length, THREAD);
1119       const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1120       ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1121       JImageFile* jimage = cpie->jimage();
1122       char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1123       if (module_name != NULL) {
1124         loader_type = ClassLoader::module_to_classloader(module_name);
1125       }
1126     }
1127   } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1128     loader_type = ClassLoader::BOOT_LOADER;
1129   }
1130   return loader_type;
1131 #endif
1132   return ClassLoader::BOOT_LOADER; // the classloader type is ignored in non-CDS cases
1133 }
1134 
1135 
1136 // caller needs ResourceMark
1137 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1138                                                   int class_name_len) {
1139   assert(class_name != NULL, "invariant");
1140   assert((int)strlen(class_name) == class_name_len, "invariant");
1141 
1142   static const char class_suffix[] = ".class";
1143 
1144   char* const file_name = NEW_RESOURCE_ARRAY(char,
1145                                              class_name_len +
1146                                              sizeof(class_suffix)); // includes term NULL
1147 
1148   strncpy(file_name, class_name, class_name_len);
1149   strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1150 
1151   return file_name;
1152 }
1153 
1154 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1155 
1156   assert(name != NULL, "invariant");
1157   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1158 
1159   ResourceMark rm;
1160   HandleMark hm;
1161 
1162   const char* const class_name = name->as_C_string();
1163 
1164   EventMark m("loading class %s", class_name);
1165   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1166 
1167   const char* const file_name = file_name_for_class_name(class_name,
1168                                                          name->utf8_length());
1169   assert(file_name != NULL, "invariant");
1170 
1171   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1172 
1173   // Lookup stream for parsing .class file
1174   ClassFileStream* stream = NULL;
1175   s2 classpath_index = 0;
1176 
1177   // If DumpSharedSpaces is true, boot loader visibility boundaries are set
1178   // to be _first_entry to the end (all path entries).
1179   //
1180   // If search_append_only is true, boot loader visibility boundaries are
1181   // set to be _fist_append_entry to the end. This includes:
1182   //   [-Xbootclasspath/a]; [jvmti appended entries]
1183   //
1184   // If both DumpSharedSpaces and search_append_only are false, boot loader
1185   // visibility boundaries are set to be _first_entry to the entry before
1186   // the _first_append_entry.  This would include:
1187   //   [-Xpatch:<dirs>];  [exploded build | modules]
1188   //
1189   // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1190   // be true at the same time.
1191   ClassPathEntry* e = (search_append_only ? _first_append_entry : _first_entry);
1192   ClassPathEntry* last_e =
1193       (search_append_only || DumpSharedSpaces ? NULL : _first_append_entry);
1194 
1195   {
1196     if (search_append_only) {
1197       // For the boot loader append path search, must calculate
1198       // the starting classpath_index prior to attempting to
1199       // load the classfile.
1200       ClassPathEntry *tmp_e = _first_entry;
1201       while ((tmp_e != NULL) && (tmp_e != _first_append_entry)) {
1202         tmp_e = tmp_e->next();
1203         ++classpath_index;
1204       }
1205     }
1206 
1207     // Attempt to load the classfile from either:
1208     //   - [-Xpatch:dir]; exploded build | modules
1209     //     or
1210     //   - [-Xbootclasspath/a]; [jvmti appended entries]
1211     while ((e != NULL) && (e != last_e)) {
1212       stream = e->open_stream(file_name, CHECK_NULL);
1213       if (!context.check(stream, classpath_index)) {
1214         return NULL;
1215       }
1216       if (NULL != stream) {
1217         break;
1218       }
1219       e = e->next();
1220       ++classpath_index;
1221     }
1222   }
1223 
1224   if (NULL == stream) {
1225     if (DumpSharedSpaces) {
1226       tty->print_cr("Preload Warning: Cannot find %s", class_name);
1227     }
1228     return NULL;
1229   }
1230 
1231   stream->set_verify(context.should_verify(classpath_index));
1232 
1233   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1234   Handle protection_domain;
1235 
1236   instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1237                                                                 name,
1238                                                                 loader_data,
1239                                                                 protection_domain,
1240                                                                 NULL, // host_klass
1241                                                                 NULL, // cp_patches
1242                                                                 NULL, // parsed_name
1243                                                                 THREAD);
1244   if (HAS_PENDING_EXCEPTION) {
1245     if (DumpSharedSpaces) {
1246       tty->print_cr("Preload Error: Failed to load %s", class_name);
1247     }
1248     return NULL;
1249   }
1250 
1251   jshort loader_type = classloader_type(name, e, classpath_index, CHECK_NULL);
1252   return context.record_result(classpath_index, loader_type, e, result, THREAD);
1253 }
1254 
1255 // Initialize the class loader's access to methods in libzip.  Parse and
1256 // process the boot classpath into a list ClassPathEntry objects.  Once
1257 // this list has been created, it must not change order (see class PackageInfo)
1258 // it can be appended to and is by jvmti and the kernel vm.
1259 
1260 void ClassLoader::initialize() {
1261   EXCEPTION_MARK;
1262 
1263   if (UsePerfData) {
1264     // jvmstat performance counters
1265     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1266     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1267     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1268     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1269     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1270     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1271     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1272     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1273     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1274     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1275 
1276     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1277     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1278     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1279     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1280     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1281     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1282     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1283     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1284     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1285     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1286     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1287     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1288     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1289 
1290 
1291     // The following performance counters are added for measuring the impact
1292     // of the bug fix of 6365597. They are mainly focused on finding out
1293     // the behavior of system & user-defined classloader lock, whether
1294     // ClassLoader.loadClass/findClass is being called synchronized or not.
1295     // Also two additional counters are created to see whether 'UnsyncloadClass'
1296     // flag is being set or not and how many times load_instance_class call
1297     // fails with linkageError etc.
1298     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1299                         "systemLoaderLockContentionRate");
1300     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1301                         "nonSystemLoaderLockContentionRate");
1302     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1303                         "jvmFindLoadedClassNoLockCalls");
1304     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1305                         "jvmDefineClassNoLockCalls");
1306 
1307     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1308                         "jniDefineClassNoLockCalls");
1309 
1310     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1311                         "unsafeDefineClassCalls");
1312 
1313     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1314     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1315                         "loadInstanceClassFailRate");
1316 
1317     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1318     if (UnsyncloadClass) {
1319       _isUnsyncloadClass->inc();
1320     }
1321   }
1322 
1323   // lookup zip library entry points
1324   load_zip_library();
1325   // lookup jimage library entry points
1326   load_jimage_library();
1327 #if INCLUDE_CDS
1328   // initialize search path
1329   if (DumpSharedSpaces) {
1330     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1331   }
1332 #endif
1333   setup_bootstrap_search_path();
1334 }
1335 
1336 #if INCLUDE_CDS
1337 void ClassLoader::initialize_shared_path() {
1338   if (DumpSharedSpaces) {
1339     ClassLoaderExt::setup_search_paths();
1340     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1341   }
1342 }
1343 #endif
1344 
1345 jlong ClassLoader::classloader_time_ms() {
1346   return UsePerfData ?
1347     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1348 }
1349 
1350 jlong ClassLoader::class_init_count() {
1351   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1352 }
1353 
1354 jlong ClassLoader::class_init_time_ms() {
1355   return UsePerfData ?
1356     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1357 }
1358 
1359 jlong ClassLoader::class_verify_time_ms() {
1360   return UsePerfData ?
1361     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1362 }
1363 
1364 jlong ClassLoader::class_link_count() {
1365   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1366 }
1367 
1368 jlong ClassLoader::class_link_time_ms() {
1369   return UsePerfData ?
1370     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1371 }
1372 
1373 int ClassLoader::compute_Object_vtable() {
1374   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1375   // code to determine actual value from file
1376   // Would be value '11' if finals were in vtable
1377   int JDK_1_2_Object_vtable_size = 5;
1378   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1379 }
1380 
1381 
1382 void classLoader_init() {
1383   ClassLoader::initialize();
1384 }
1385 
1386 
1387 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1388   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1389   if (CanonicalizeEntry != NULL) {
1390     JavaThread* THREAD = JavaThread::current();
1391     JNIEnv* env = THREAD->jni_environment();
1392     ResourceMark rm(THREAD);
1393 
1394     // os::native_path writes into orig_copy
1395     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1396     strcpy(orig_copy, orig);
1397     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1398       return false;
1399     }
1400   } else {
1401     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1402     strncpy(out, orig, len);
1403     out[len - 1] = '\0';
1404   }
1405   return true;
1406 }
1407 
1408 void ClassLoader::create_javabase() {
1409   Thread* THREAD = Thread::current();
1410 
1411   // Create java.base's module entry for the boot
1412   // class loader prior to loading j.l.Ojbect.
1413   ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1414 
1415   // Get module entry table
1416   ModuleEntryTable* null_cld_modules = null_cld->modules();
1417   if (null_cld_modules == NULL) {
1418     vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1419   }
1420 
1421   {
1422     MutexLocker ml(Module_lock, THREAD);
1423     ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld);
1424     if (jb_module == NULL) {
1425       vm_exit_during_initialization("Unable to create ModuleEntry for java.base");
1426     }
1427     ModuleEntryTable::set_javabase_module(jb_module);
1428   }
1429 
1430   // When looking for the jimage file, only
1431   // search the boot loader's module path which
1432   // can consist of [-Xpatch]; exploded build | modules
1433   // Do not search the boot loader's append path.
1434   ClassPathEntry* e = _first_entry;
1435   ClassPathEntry* last_e = _first_append_entry;
1436   while ((e != NULL) && (e != last_e)) {
1437     JImageFile *jimage = e->jimage();
1438     if (jimage != NULL && e->is_jrt()) {
1439       set_has_jimage(true);
1440 #if INCLUDE_CDS
1441       ClassLoader::initialize_module_loader_map(jimage);
1442 #endif
1443       return;
1444     }
1445     e = e->next();
1446   }
1447 }
1448 
1449 #ifndef PRODUCT
1450 
1451 // CompileTheWorld
1452 //
1453 // Iterates over all class path entries and forces compilation of all methods
1454 // in all classes found. Currently, only zip/jar archives are searched.
1455 //
1456 // The classes are loaded by the Java level bootstrap class loader, and the
1457 // initializer is called. If DelayCompilationDuringStartup is true (default),
1458 // the interpreter will run the initialization code. Note that forcing
1459 // initialization in this way could potentially lead to initialization order
1460 // problems, in which case we could just force the initialization bit to be set.
1461 
1462 
1463 // We need to iterate over the contents of a zip/jar file, so we replicate the
1464 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1465 // since jzfile already has a void* definition.
1466 //
1467 // Note that this is only used in debug mode.
1468 //
1469 // HotSpot integration note:
1470 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1471 
1472 
1473 // JDK 1.3 version
1474 typedef struct real_jzentry {         /* Zip file entry */
1475     char *name;                 /* entry name */
1476     jint time;                  /* modification time */
1477     jint size;                  /* size of uncompressed data */
1478     jint csize;                 /* size of compressed data (zero if uncompressed) */
1479     jint crc;                   /* crc of uncompressed data */
1480     char *comment;              /* optional zip file comment */
1481     jbyte *extra;               /* optional extra data */
1482     jint pos;                   /* position of LOC header (if negative) or data */
1483 } real_jzentry;
1484 
1485 typedef struct real_jzfile {  /* Zip file */
1486     char *name;                 /* zip file name */
1487     jint refs;                  /* number of active references */
1488     jint fd;                    /* open file descriptor */
1489     void *lock;                 /* read lock */
1490     char *comment;              /* zip file comment */
1491     char *msg;                  /* zip error message */
1492     void *entries;              /* array of hash cells */
1493     jint total;                 /* total number of entries */
1494     unsigned short *table;      /* Hash chain heads: indexes into entries */
1495     jint tablelen;              /* number of hash eads */
1496     real_jzfile *next;        /* next zip file in search list */
1497     jzentry *cache;             /* we cache the most recently freed jzentry */
1498     /* Information on metadata names in META-INF directory */
1499     char **metanames;           /* array of meta names (may have null names) */
1500     jint metacount;             /* number of slots in metanames array */
1501     /* If there are any per-entry comments, they are in the comments array */
1502     char **comments;
1503 } real_jzfile;
1504 
1505 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1506   // For now we only compile all methods in all classes in zip/jar files
1507   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1508   tty->cr();
1509 }
1510 
1511 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1512   real_jzfile* zip = (real_jzfile*) _zip;
1513   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1514   tty->cr();
1515   // Iterate over all entries in zip file
1516   for (int n = 0; ; n++) {
1517     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1518     if (ze == NULL) break;
1519     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1520   }
1521   if (HAS_PENDING_EXCEPTION) {
1522     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1523       CLEAR_PENDING_EXCEPTION;
1524       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1525       tty->print_cr("Increase class metadata storage if a limit was set");
1526     } else {
1527       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1528     }
1529   }
1530 }
1531 
1532 void ClassLoader::compile_the_world() {
1533   EXCEPTION_MARK;
1534   HandleMark hm(THREAD);
1535   ResourceMark rm(THREAD);
1536 
1537   // Find bootstrap loader
1538   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1539   // Iterate over all bootstrap class path entries
1540   ClassPathEntry* e = _first_entry;
1541   jlong start = os::javaTimeMillis();
1542   while (e != NULL) {
1543     // We stop at "modules" jimage, unless it is the first bootstrap path entry
1544     if (e->is_jrt() && e != _first_entry) break;
1545     e->compile_the_world(system_class_loader, CATCH);
1546     e = e->next();
1547   }
1548   jlong end = os::javaTimeMillis();
1549   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1550                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1551   {
1552     // Print statistics as if before normal exit:
1553     extern void print_statistics();
1554     print_statistics();
1555   }
1556   vm_exit(0);
1557 }
1558 
1559 int ClassLoader::_compile_the_world_class_counter = 0;
1560 int ClassLoader::_compile_the_world_method_counter = 0;
1561 static int _codecache_sweep_counter = 0;
1562 
1563 // Filter out all exceptions except OOMs
1564 static void clear_pending_exception_if_not_oom(TRAPS) {
1565   if (HAS_PENDING_EXCEPTION &&
1566       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1567     CLEAR_PENDING_EXCEPTION;
1568   }
1569   // The CHECK at the caller will propagate the exception out
1570 }
1571 
1572 /**
1573  * Returns if the given method should be compiled when doing compile-the-world.
1574  *
1575  * TODO:  This should be a private method in a CompileTheWorld class.
1576  */
1577 static bool can_be_compiled(methodHandle m, int comp_level) {
1578   assert(CompileTheWorld, "must be");
1579 
1580   // It's not valid to compile a native wrapper for MethodHandle methods
1581   // that take a MemberName appendix since the bytecode signature is not
1582   // correct.
1583   vmIntrinsics::ID iid = m->intrinsic_id();
1584   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1585     return false;
1586   }
1587 
1588   return CompilationPolicy::can_be_compiled(m, comp_level);
1589 }
1590 
1591 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1592   if (string_ends_with(name, ".class")) {
1593     // We have a .class file
1594     int len = (int)strlen(name);
1595     char buffer[2048];
1596     strncpy(buffer, name, len - 6);
1597     buffer[len-6] = 0;
1598     // If the file has a period after removing .class, it's not really a
1599     // valid class file.  The class loader will check everything else.
1600     if (strchr(buffer, '.') == NULL) {
1601       _compile_the_world_class_counter++;
1602       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1603 
1604       // Construct name without extension
1605       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1606       // Use loader to load and initialize class
1607       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1608       instanceKlassHandle k (THREAD, ik);
1609       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1610         k->initialize(THREAD);
1611       }
1612       bool exception_occurred = HAS_PENDING_EXCEPTION;
1613       clear_pending_exception_if_not_oom(CHECK);
1614       if (CompileTheWorldPreloadClasses && k.not_null()) {
1615         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1616         if (HAS_PENDING_EXCEPTION) {
1617           // If something went wrong in preloading we just ignore it
1618           clear_pending_exception_if_not_oom(CHECK);
1619           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1620         }
1621       }
1622 
1623       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1624         if (k.is_null() || exception_occurred) {
1625           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1626           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1627         } else {
1628           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1629           // Preload all classes to get around uncommon traps
1630           // Iterate over all methods in class
1631           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1632           for (int n = 0; n < k->methods()->length(); n++) {
1633             methodHandle m (THREAD, k->methods()->at(n));
1634             if (can_be_compiled(m, comp_level)) {
1635               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1636                 // Give sweeper a chance to keep up with CTW
1637                 VM_ForceSafepoint op;
1638                 VMThread::execute(&op);
1639                 _codecache_sweep_counter = 0;
1640               }
1641               // Force compilation
1642               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1643                                             methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1644               if (HAS_PENDING_EXCEPTION) {
1645                 clear_pending_exception_if_not_oom(CHECK);
1646                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1647               } else {
1648                 _compile_the_world_method_counter++;
1649               }
1650               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1651                 // Clobber the first compile and force second tier compilation
1652                 CompiledMethod* nm = m->code();
1653                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1654                   // Throw out the code so that the code cache doesn't fill up
1655                   nm->make_not_entrant();
1656                   m->clear_code();
1657                 }
1658                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1659                                               methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1660                 if (HAS_PENDING_EXCEPTION) {
1661                   clear_pending_exception_if_not_oom(CHECK);
1662                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1663                 } else {
1664                   _compile_the_world_method_counter++;
1665                 }
1666               }
1667             } else {
1668               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1669             }
1670 
1671             CompiledMethod* nm = m->code();
1672             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1673               // Throw out the code so that the code cache doesn't fill up
1674               nm->make_not_entrant();
1675               m->clear_code();
1676             }
1677           }
1678         }
1679       }
1680     }
1681   }
1682 }
1683 
1684 #endif //PRODUCT
1685 
1686 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1687 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1688 void PerfClassTraceTime::initialize() {
1689   if (!UsePerfData) return;
1690 
1691   if (_eventp != NULL) {
1692     // increment the event counter
1693     _eventp->inc();
1694   }
1695 
1696   // stop the current active thread-local timer to measure inclusive time
1697   _prev_active_event = -1;
1698   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1699      if (_timers[i].is_active()) {
1700        assert(_prev_active_event == -1, "should have only one active timer");
1701        _prev_active_event = i;
1702        _timers[i].stop();
1703      }
1704   }
1705 
1706   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1707     // start the inclusive timer if not recursively called
1708     _t.start();
1709   }
1710 
1711   // start thread-local timer of the given event type
1712    if (!_timers[_event_type].is_active()) {
1713     _timers[_event_type].start();
1714   }
1715 }
1716 
1717 PerfClassTraceTime::~PerfClassTraceTime() {
1718   if (!UsePerfData) return;
1719 
1720   // stop the thread-local timer as the event completes
1721   // and resume the thread-local timer of the event next on the stack
1722   _timers[_event_type].stop();
1723   jlong selftime = _timers[_event_type].ticks();
1724 
1725   if (_prev_active_event >= 0) {
1726     _timers[_prev_active_event].start();
1727   }
1728 
1729   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1730 
1731   // increment the counters only on the leaf call
1732   _t.stop();
1733   _timep->inc(_t.ticks());
1734   if (_selftimep != NULL) {
1735     _selftimep->inc(selftime);
1736   }
1737   // add all class loading related event selftime to the accumulated time counter
1738   ClassLoader::perf_accumulated_time()->inc(selftime);
1739 
1740   // reset the timer
1741   _timers[_event_type].reset();
1742 }