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         n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", version, name);
 311         entry_name[n] = '\0';
 312         buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 313         if (buffer == NULL) {
 314           warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
 315         }
 316       }
 317       if (buffer == NULL) {
 318         for (int i = cur_ver; i >= base_version; i--) {
 319           n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", i, name);
 320           entry_name[n] = '\0';
 321           buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 322           if (buffer != NULL) {
 323             break;
 324           }
 325         }
 326       }
 327     }
 328   }
 329   return buffer;
 330 }
 331 
 332 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
 333   assert(DumpSharedSpaces, "called only at dump time");
 334   if (_multi_versioned != _unknown) {
 335     return (_multi_versioned == _yes) ? true : false;
 336   }
 337   jint size;
 338   char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
 339   if (buffer != NULL) {
 340     char* p = buffer;
 341     for ( ; *p; ++p) *p = tolower(*p);
 342     if (strstr(buffer, "multi-release: true") != NULL) {
 343       _multi_versioned = _yes;
 344       return true;
 345     }
 346   }
 347   _multi_versioned = _no;
 348   return false;
 349 }
 350 #endif // INCLUDE_CDS
 351 
 352 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 353   jint filesize;
 354   u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
 355   if (buffer == NULL) {
 356     buffer = open_entry(name, &filesize, false, CHECK_NULL);
 357     if (buffer == NULL) {
 358       return NULL;
 359     }
 360   }
 361   if (UsePerfData) {
 362     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 363   }
 364   // Resource allocated
 365   return new ClassFileStream(buffer,
 366                              filesize,
 367                              _zip_name,
 368                              ClassFileStream::verify);
 369 }
 370 
 371 // invoke function for each entry in the zip file
 372 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 373   JavaThread* thread = JavaThread::current();
 374   HandleMark  handle_mark(thread);
 375   ThreadToNativeFromVM ttn(thread);
 376   for (int n = 0; ; n++) {
 377     jzentry * ze = ((*GetNextEntry)(_zip, n));
 378     if (ze == NULL) break;
 379     (*f)(ze->name, context);
 380   }
 381 }
 382 
 383 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
 384   ClassPathEntry(),
 385   _jimage(jimage) {
 386   guarantee(jimage != NULL, "jimage file is null");
 387   guarantee(name != NULL, "jimage file name is null");
 388   size_t len = strlen(name) + 1;
 389   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 390   strncpy((char *)_name, name, len);
 391 }
 392 
 393 ClassPathImageEntry::~ClassPathImageEntry() {
 394   if (_name != NULL) {
 395     FREE_C_HEAP_ARRAY(const char, _name);
 396     _name = NULL;
 397   }
 398   if (_jimage != NULL) {
 399     (*JImageClose)(_jimage);
 400     _jimage = NULL;
 401   }
 402 }
 403 
 404 void ClassPathImageEntry::name_to_package(const char* name, char* buffer, int length) {
 405   const char *pslash = strrchr(name, '/');
 406   if (pslash == NULL) {
 407     buffer[0] = '\0';
 408     return;
 409   }
 410   int len = pslash - name;
 411 #if INCLUDE_CDS
 412   if (len <= 0 && DumpSharedSpaces) {
 413     buffer[0] = '\0';
 414     return;
 415   }
 416 #endif
 417   assert(len > 0, "Bad length for package name");
 418   if (len >= length) {
 419     buffer[0] = '\0';
 420     return;
 421   }
 422   // drop name after last slash (including slash)
 423   // Ex., "java/lang/String.class" => "java/lang"
 424   strncpy(buffer, name, len);
 425   // ensure string termination (strncpy does not guarantee)
 426   buffer[len] = '\0';
 427 }
 428 
 429 // For a class in a named module, look it up in the jimage file using this syntax:
 430 //    /<module-name>/<package-name>/<base-class>
 431 //
 432 // Assumptions:
 433 //     1. There are no unnamed modules in the jimage file.
 434 //     2. A package is in at most one module in the jimage file.
 435 //
 436 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 437   jlong size;
 438   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 439 
 440   if (location == 0) {
 441     char package[JIMAGE_MAX_PATH];
 442     name_to_package(name, package, JIMAGE_MAX_PATH);
 443 
 444 #if INCLUDE_CDS
 445     if (package[0] == '\0' && DumpSharedSpaces) {
 446       return NULL;
 447     }
 448 #endif
 449     if (package[0] != '\0') {
 450       if (!Universe::is_module_initialized()) {
 451         location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size);
 452 #if INCLUDE_CDS
 453         // CDS uses the boot class loader to load classes whose packages are in
 454         // modules defined for other class loaders.  So, for now, get their module
 455         // names from the "modules" jimage file.
 456         if (DumpSharedSpaces && location == 0) {
 457           const char* module_name = (*JImagePackageToModule)(_jimage, package);
 458           if (module_name != NULL) {
 459             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 460           }
 461         }
 462 #endif
 463 
 464       } else {
 465         // Get boot class loader's package entry table
 466         PackageEntryTable* pkgEntryTable =
 467           ClassLoaderData::the_null_class_loader_data()->packages();
 468         // Get package's package entry
 469         TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package, CHECK_NULL);
 470         PackageEntry* package_entry = pkgEntryTable->lookup_only(pkg_symbol);
 471 
 472         if (package_entry != NULL) {
 473           ResourceMark rm;
 474           // Get the module name
 475           ModuleEntry* module = package_entry->module();
 476           assert(module != NULL, "Boot classLoader package missing module");
 477           assert(module->is_named(), "Boot classLoader package is in unnamed module");
 478           const char* module_name = module->name()->as_C_string();
 479           if (module_name != NULL) {
 480             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 481           }
 482         }
 483       }
 484     }
 485   }
 486   if (location != 0) {
 487     if (UsePerfData) {
 488       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 489     }
 490     char* data = NEW_RESOURCE_ARRAY(char, size);
 491     (*JImageGetResource)(_jimage, location, data, size);
 492     // Resource allocated
 493     return new ClassFileStream((u1*)data,
 494                                (int)size,
 495                                _name,
 496                                ClassFileStream::verify);
 497   }
 498 
 499   return NULL;
 500 }
 501 
 502 #ifndef PRODUCT
 503 bool ctw_visitor(JImageFile* jimage,
 504         const char* module_name, const char* version, const char* package,
 505         const char* name, const char* extension, void* arg) {
 506   if (strcmp(extension, "class") == 0) {
 507     Thread* THREAD = Thread::current();
 508     char path[JIMAGE_MAX_PATH];
 509     jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
 510     ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
 511     return !HAS_PENDING_EXCEPTION;
 512   }
 513   return true;
 514 }
 515 
 516 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 517   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 518   tty->cr();
 519   (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
 520   if (HAS_PENDING_EXCEPTION) {
 521     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 522       CLEAR_PENDING_EXCEPTION;
 523       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 524       tty->print_cr("Increase class metadata storage if a limit was set");
 525     } else {
 526       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 527     }
 528   }
 529 }
 530 #endif
 531 
 532 bool ClassPathImageEntry::is_jrt() {
 533   return ClassLoader::is_jrt(name());
 534 }
 535 
 536 #if INCLUDE_CDS
 537 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 538   assert(DumpSharedSpaces, "only called at dump time");
 539   tty->print_cr("Hint: enable -Xlog:classpath=info to diagnose the failure");
 540   vm_exit_during_initialization(error, message);
 541 }
 542 #endif
 543 
 544 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 545   if (log_is_enabled(Info, classpath)) {
 546     ResourceMark rm;
 547     outputStream* out = Log(classpath)::info_stream();
 548     if (msg) {
 549       out->print("%s", msg);
 550     }
 551     if (name) {
 552       if (strlen(name) < 256) {
 553         out->print("%s", name);
 554       } else {
 555         // For very long paths, we need to print each character separately,
 556         // as print_cr() has a length limit
 557         while (name[0] != '\0') {
 558           out->print("%c", name[0]);
 559           name++;
 560         }
 561       }
 562     }
 563     out->cr();
 564   }
 565 }
 566 
 567 #if INCLUDE_CDS
 568 void ClassLoader::check_shared_classpath(const char *path) {
 569   if (strcmp(path, "") == 0) {
 570     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 571   }
 572 
 573   struct stat st;
 574   if (os::stat(path, &st) == 0) {
 575     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 576       if (!os::dir_is_empty(path)) {
 577         tty->print_cr("Error: non-empty directory '%s'", path);
 578         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 579       }
 580     }
 581   }
 582 }
 583 #endif
 584 
 585 void ClassLoader::setup_bootstrap_search_path() {
 586   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 587   const char* sys_class_path = Arguments::get_sysclasspath();
 588   const char* java_class_path = Arguments::get_appclasspath();
 589   if (PrintSharedArchiveAndExit) {
 590     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 591     // the same as the bootcp of the shared archive.
 592   } else {
 593     trace_class_path("bootstrap loader class path=", sys_class_path);
 594     trace_class_path("classpath: ", java_class_path);
 595   }
 596 #if INCLUDE_CDS
 597   if (DumpSharedSpaces) {
 598     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 599   }
 600 #endif
 601   setup_search_path(sys_class_path, true);
 602 }
 603 
 604 #if INCLUDE_CDS
 605 int ClassLoader::get_shared_paths_misc_info_size() {
 606   return _shared_paths_misc_info->get_used_bytes();
 607 }
 608 
 609 void* ClassLoader::get_shared_paths_misc_info() {
 610   return _shared_paths_misc_info->buffer();
 611 }
 612 
 613 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 614   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 615   bool result = checker->check();
 616   delete checker;
 617   return result;
 618 }
 619 #endif
 620 
 621 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
 622   int offset = 0;
 623   int len = (int)strlen(class_path);
 624   int end = 0;
 625   bool mark_append_entry = false;
 626 
 627   // Iterate over class path entries
 628   for (int start = 0; start < len; start = end) {
 629     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 630       end++;
 631     }
 632     EXCEPTION_MARK;
 633     ResourceMark rm(THREAD);
 634     mark_append_entry = (mark_append_entry ||
 635       (bootstrap_search && (start == Arguments::bootclassloader_append_index())));
 636     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 637     strncpy(path, &class_path[start], end - start);
 638     path[end - start] = '\0';
 639     update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search);
 640 
 641     // Check on the state of the boot loader's append path
 642     if (mark_append_entry && (_first_append_entry == NULL)) {
 643       // Failure to mark the first append entry, most likely
 644       // due to a non-existent path. Record the next entry
 645       // as the first boot loader append entry.
 646       mark_append_entry = true;
 647     } else {
 648       mark_append_entry = false;
 649     }
 650 
 651 #if INCLUDE_CDS
 652     if (DumpSharedSpaces) {
 653       check_shared_classpath(path);
 654     }
 655 #endif
 656     while (class_path[end] == os::path_separator()[0]) {
 657       end++;
 658     }
 659   }
 660 }
 661 
 662 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 663                                                      bool throw_exception,
 664                                                      bool is_boot_append, TRAPS) {
 665   JavaThread* thread = JavaThread::current();
 666   ClassPathEntry* new_entry = NULL;
 667   if ((st->st_mode & S_IFREG) == S_IFREG) {
 668     // Regular file, should be a zip or jimage file
 669     // Canonicalized filename
 670     char canonical_path[JVM_MAXPATHLEN];
 671     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 672       // This matches the classic VM
 673       if (throw_exception) {
 674         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 675       } else {
 676         return NULL;
 677       }
 678     }
 679     jint error;
 680     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 681     if (jimage != NULL) {
 682       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 683     } else {
 684       char* error_msg = NULL;
 685       jzfile* zip;
 686       {
 687         // enable call to C land
 688         ThreadToNativeFromVM ttn(thread);
 689         HandleMark hm(thread);
 690         zip = (*ZipOpen)(canonical_path, &error_msg);
 691       }
 692       if (zip != NULL && error_msg == NULL) {
 693         new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
 694       } else {
 695         ResourceMark rm(thread);
 696         char *msg;
 697         if (error_msg == NULL) {
 698           msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 699           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 700         } else {
 701           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 702           msg = NEW_RESOURCE_ARRAY(char, len); ;
 703           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 704         }
 705         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 706         if (throw_exception && is_init_completed()) {
 707           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 708         } else {
 709           return NULL;
 710         }
 711       }
 712     }
 713     log_info(classpath)("opened: %s", path);
 714     log_info(classload)("opened: %s", path);
 715   } else {
 716     // Directory
 717     new_entry = new ClassPathDirEntry(path);
 718     log_info(classload)("path: %s", path);
 719   }
 720   return new_entry;
 721 }
 722 
 723 
 724 // Create a class path zip entry for a given path (return NULL if not found
 725 // or zip/JAR file cannot be opened)
 726 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
 727   // check for a regular file
 728   struct stat st;
 729   if (os::stat(path, &st) == 0) {
 730     if ((st.st_mode & S_IFREG) == S_IFREG) {
 731       char canonical_path[JVM_MAXPATHLEN];
 732       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 733         char* error_msg = NULL;
 734         jzfile* zip;
 735         {
 736           // enable call to C land
 737           JavaThread* thread = JavaThread::current();
 738           ThreadToNativeFromVM ttn(thread);
 739           HandleMark hm(thread);
 740           zip = (*ZipOpen)(canonical_path, &error_msg);
 741         }
 742         if (zip != NULL && error_msg == NULL) {
 743           // create using canonical path
 744           return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
 745         }
 746       }
 747     }
 748   }
 749   return NULL;
 750 }
 751 
 752 // The boot class loader must adhere to specfic visibility rules.
 753 // Prior to loading a class in a named package, the package is checked
 754 // to see if it is in a module defined to the boot loader. If the
 755 // package is not in a module defined to the boot loader, the class
 756 // must be loaded only in the boot loader's append path, which
 757 // consists of [-Xbootclasspath/a]; [jvmti appended entries]
 758 void ClassLoader::set_first_append_entry(ClassPathEntry *new_entry) {
 759   if (_first_append_entry == NULL) {
 760     _first_append_entry = new_entry;
 761   }
 762 }
 763 
 764 // returns true if entry already on class path
 765 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 766   ClassPathEntry* e = _first_entry;
 767   while (e != NULL) {
 768     // assume zip entries have been canonicalized
 769     if (strcmp(entry->name(), e->name()) == 0) {
 770       return true;
 771     }
 772     e = e->next();
 773   }
 774   return false;
 775 }
 776 
 777 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 778   if (new_entry != NULL) {
 779     if (_last_entry == NULL) {
 780       _first_entry = _last_entry = new_entry;
 781     } else {
 782       _last_entry->set_next(new_entry);
 783       _last_entry = new_entry;
 784     }
 785   }
 786   _num_entries ++;
 787 }
 788 
 789 void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) {
 790   if (new_entry != NULL) {
 791     if (_last_entry == NULL) {
 792       _first_entry = _last_entry = new_entry;
 793     } else {
 794       new_entry->set_next(_first_entry);
 795       _first_entry = new_entry;
 796     }
 797   }
 798   _num_entries ++;
 799 }
 800 
 801 void ClassLoader::add_to_list(const char *apath) {
 802   update_class_path_entry_list((char*)apath, false, false, false, false);
 803 }
 804 
 805 void ClassLoader::prepend_to_list(const char *apath) {
 806   update_class_path_entry_list((char*)apath, false, false, true, false);
 807 }
 808 
 809 // Returns true IFF the file/dir exists and the entry was successfully created.
 810 bool ClassLoader::update_class_path_entry_list(const char *path,
 811                                                bool check_for_duplicates,
 812                                                bool mark_append_entry,
 813                                                bool prepend_entry,
 814                                                bool is_boot_append,
 815                                                bool throw_exception) {
 816   struct stat st;
 817   if (os::stat(path, &st) == 0) {
 818     // File or directory found
 819     ClassPathEntry* new_entry = NULL;
 820     Thread* THREAD = Thread::current();
 821     new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
 822     if (new_entry == NULL) {
 823       return false;
 824     }
 825 
 826     // Ensure that the first boot loader append entry will always be set correctly.
 827     assert((!mark_append_entry ||
 828             (mark_append_entry && (!check_for_duplicates || !contains_entry(new_entry)))),
 829            "failed to mark boot loader's first append boundary");
 830 
 831     // Do not reorder the bootclasspath which would break get_system_package().
 832     // Add new entry to linked list
 833 
 834     if (!check_for_duplicates || !contains_entry(new_entry)) {
 835       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry, prepend_entry);
 836       if (mark_append_entry) {
 837         set_first_append_entry(new_entry);
 838       }
 839     }
 840     return true;
 841   } else {
 842 #if INCLUDE_CDS
 843     if (DumpSharedSpaces) {
 844       _shared_paths_misc_info->add_nonexist_path(path);
 845     }
 846 #endif
 847     return false;
 848   }
 849 }
 850 
 851 void ClassLoader::print_bootclasspath() {
 852   ClassPathEntry* e = _first_entry;
 853   tty->print("[bootclasspath= ");
 854   while (e != NULL) {
 855     tty->print("%s ;", e->name());
 856     e = e->next();
 857   }
 858   tty->print_cr("]");
 859 }
 860 
 861 void ClassLoader::load_zip_library() {
 862   assert(ZipOpen == NULL, "should not load zip library twice");
 863   // First make sure native library is loaded
 864   os::native_java_library();
 865   // Load zip library
 866   char path[JVM_MAXPATHLEN];
 867   char ebuf[1024];
 868   void* handle = NULL;
 869   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 870     handle = os::dll_load(path, ebuf, sizeof ebuf);
 871   }
 872   if (handle == NULL) {
 873     vm_exit_during_initialization("Unable to load ZIP library", path);
 874   }
 875   // Lookup zip entry points
 876   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 877   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 878   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 879   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 880   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 881   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 882   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 883   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 884 
 885   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 886   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
 887       GetNextEntry == NULL || Crc32 == NULL) {
 888     vm_exit_during_initialization("Corrupted ZIP library", path);
 889   }
 890 
 891   if (ZipInflateFully == NULL) {
 892     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
 893   }
 894 
 895   // Lookup canonicalize entry in libjava.dll
 896   void *javalib_handle = os::native_java_library();
 897   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 898   // This lookup only works on 1.3. Do not check for non-null here
 899 }
 900 
 901 void ClassLoader::load_jimage_library() {
 902   // First make sure native library is loaded
 903   os::native_java_library();
 904   // Load jimage library
 905   char path[JVM_MAXPATHLEN];
 906   char ebuf[1024];
 907   void* handle = NULL;
 908   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
 909     handle = os::dll_load(path, ebuf, sizeof ebuf);
 910   }
 911   if (handle == NULL) {
 912     vm_exit_during_initialization("Unable to load jimage library", path);
 913   }
 914 
 915   // Lookup jimage entry points
 916   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
 917   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
 918   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
 919   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
 920   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
 921   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
 922   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
 923   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
 924   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
 925   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
 926   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
 927   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
 928 }
 929 
 930 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
 931   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
 932 }
 933 
 934 int ClassLoader::crc32(int crc, const char* buf, int len) {
 935   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
 936   return (*Crc32)(crc, (const jbyte*)buf, len);
 937 }
 938 
 939 #if INCLUDE_CDS
 940 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
 941   jlong size;
 942   JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size);
 943   if (location == 0) {
 944     vm_exit_during_initialization(
 945       "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
 946   }
 947   char* buffer = NEW_RESOURCE_ARRAY(char, size);
 948   jlong read = (*JImageGetResource)(jimage, location, buffer, size);
 949   if (read != size) {
 950     vm_exit_during_initialization(
 951       "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
 952   }
 953   char* char_buf = (char*)buffer;
 954   int buflen = (int)strlen(char_buf);
 955   char* begin_ptr = char_buf;
 956   char* end_ptr = strchr(begin_ptr, '\n');
 957   bool process_boot_modules = false;
 958   _boot_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 959     GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
 960   _platform_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 961     GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
 962   while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
 963     // Allocate a buffer from the C heap to be appended to the _boot_modules_array
 964     // or the _platform_modules_array.
 965     char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
 966     strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
 967     temp_name[end_ptr - begin_ptr] = '\0';
 968     if (strncmp(temp_name, "BOOT", 4) == 0) {
 969       process_boot_modules = true;
 970       FREE_C_HEAP_ARRAY(char, temp_name);
 971     } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
 972       process_boot_modules = false;
 973       FREE_C_HEAP_ARRAY(char, temp_name);
 974     } else {
 975       // module name
 976       if (process_boot_modules) {
 977         _boot_modules_array->append(temp_name);
 978       } else {
 979         _platform_modules_array->append(temp_name);
 980       }
 981     }
 982     begin_ptr = ++end_ptr;
 983     end_ptr = strchr(begin_ptr, '\n');
 984   }
 985   FREE_RESOURCE_ARRAY(u1, buffer, size);
 986 }
 987 #endif
 988 
 989 // Function add_package extracts the package from the fully qualified class name
 990 // and checks if the package is in the boot loader's package entry table.  If so,
 991 // then it sets the classpath_index in the package entry record.
 992 //
 993 // The classpath_index field is used to find the entry on the boot loader class
 994 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
 995 // in an unnamed module.  It is also used to indicate (for all packages whose
 996 // classes are loaded by the boot loader) that at least one of the package's
 997 // classes has been loaded.
 998 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
 999   assert(fullq_class_name != NULL, "just checking");
1000 
1001   // Get package name from fully qualified class name.
1002   const char *cp = strrchr(fullq_class_name, '/');
1003   if (cp != NULL) {
1004     int len = cp - fullq_class_name;
1005     PackageEntryTable* pkg_entry_tbl =
1006       ClassLoaderData::the_null_class_loader_data()->packages();
1007     TempNewSymbol pkg_symbol =
1008       SymbolTable::new_symbol(fullq_class_name, len, CHECK_false);
1009     PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1010     if (pkg_entry != NULL) {
1011       assert(classpath_index != -1, "Unexpected classpath_index");
1012       pkg_entry->set_classpath_index(classpath_index);
1013     } else {
1014       return false;
1015     }
1016   }
1017   return true;
1018 }
1019 
1020 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1021   // Look up the name in the boot loader's package entry table.
1022   if (name != NULL) {
1023     TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1024     // Look for the package entry in the boot loader's package entry table.
1025     PackageEntry* package =
1026       ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1027 
1028     // Return NULL if package does not exist or if no classes in that package
1029     // have been loaded.
1030     if (package != NULL && package->has_loaded_class()) {
1031       ModuleEntry* module = package->module();
1032       if (module->location() != NULL) {
1033         ResourceMark rm(THREAD);
1034         Handle ml = java_lang_String::create_from_str(
1035           module->location()->as_C_string(), THREAD);
1036         return ml();
1037       }
1038       // Return entry on boot loader class path.
1039       Handle cph = java_lang_String::create_from_str(
1040         ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1041       return cph();
1042     }
1043   }
1044   return NULL;
1045 }
1046 
1047 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1048   ResourceMark rm(THREAD);
1049   // List of pointers to PackageEntrys that have loaded classes.
1050   GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1051   {
1052     MutexLocker ml(Module_lock, THREAD);
1053 
1054     PackageEntryTable* pe_table =
1055       ClassLoaderData::the_null_class_loader_data()->packages();
1056 
1057     // Collect the packages that have at least one loaded class.
1058     for (int x = 0; x < pe_table->table_size(); x++) {
1059       for (PackageEntry* package_entry = pe_table->bucket(x);
1060            package_entry != NULL;
1061            package_entry = package_entry->next()) {
1062         if (package_entry->has_loaded_class()) {
1063           loaded_class_pkgs->append(package_entry);
1064         }
1065       }
1066     }
1067   }
1068 
1069 
1070   // Allocate objArray and fill with java.lang.String
1071   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1072                                            loaded_class_pkgs->length(), CHECK_NULL);
1073   objArrayHandle result(THREAD, r);
1074   for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1075     PackageEntry* package_entry = loaded_class_pkgs->at(x);
1076     Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1077     result->obj_at_put(x, str());
1078   }
1079   return result();
1080 }
1081 
1082 #if INCLUDE_CDS
1083 s2 ClassLoader::module_to_classloader(const char* module_name) {
1084 
1085   assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1086   assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1087 
1088   int array_size = _boot_modules_array->length();
1089   for (int i = 0; i < array_size; i++) {
1090     if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1091       return BOOT_LOADER;
1092     }
1093   }
1094 
1095   array_size = _platform_modules_array->length();
1096   for (int i = 0; i < array_size; i++) {
1097     if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1098       return PLATFORM_LOADER;
1099     }
1100   }
1101 
1102   return APP_LOADER;
1103 }
1104 #endif
1105 
1106 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e,
1107                                      int classpath_index, TRAPS) {
1108 #if INCLUDE_CDS
1109   // obtain the classloader type based on the class name.
1110   // First obtain the package name based on the class name. Then obtain
1111   // the classloader type based on the package name from the jimage using
1112   // a jimage API. If the classloader type cannot be found from the
1113   // jimage, it is determined by the class path entry.
1114   jshort loader_type = ClassLoader::APP_LOADER;
1115   if (e->is_jrt()) {
1116     int length = 0;
1117     const jbyte* pkg_string = InstanceKlass::package_from_name(class_name, length);
1118     if (pkg_string != NULL) {
1119       ResourceMark rm;
1120       TempNewSymbol pkg_name = SymbolTable::new_symbol((const char*)pkg_string, length, THREAD);
1121       const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1122       ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1123       JImageFile* jimage = cpie->jimage();
1124       char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1125       if (module_name != NULL) {
1126         loader_type = ClassLoader::module_to_classloader(module_name);
1127       }
1128     }
1129   } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1130     loader_type = ClassLoader::BOOT_LOADER;
1131   }
1132   return loader_type;
1133 #endif
1134   return ClassLoader::BOOT_LOADER; // the classloader type is ignored in non-CDS cases
1135 }
1136 
1137 
1138 // caller needs ResourceMark
1139 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1140                                                   int class_name_len) {
1141   assert(class_name != NULL, "invariant");
1142   assert((int)strlen(class_name) == class_name_len, "invariant");
1143 
1144   static const char class_suffix[] = ".class";
1145 
1146   char* const file_name = NEW_RESOURCE_ARRAY(char,
1147                                              class_name_len +
1148                                              sizeof(class_suffix)); // includes term NULL
1149 
1150   strncpy(file_name, class_name, class_name_len);
1151   strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1152 
1153   return file_name;
1154 }
1155 
1156 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1157 
1158   assert(name != NULL, "invariant");
1159   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1160 
1161   ResourceMark rm;
1162   HandleMark hm;
1163 
1164   const char* const class_name = name->as_C_string();
1165 
1166   EventMark m("loading class %s", class_name);
1167   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1168 
1169   const char* const file_name = file_name_for_class_name(class_name,
1170                                                          name->utf8_length());
1171   assert(file_name != NULL, "invariant");
1172 
1173   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1174 
1175   // Lookup stream for parsing .class file
1176   ClassFileStream* stream = NULL;
1177   s2 classpath_index = 0;
1178 
1179   // If DumpSharedSpaces is true, boot loader visibility boundaries are set
1180   // to be _first_entry to the end (all path entries).
1181   //
1182   // If search_append_only is true, boot loader visibility boundaries are
1183   // set to be _fist_append_entry to the end. This includes:
1184   //   [-Xbootclasspath/a]; [jvmti appended entries]
1185   //
1186   // If both DumpSharedSpaces and search_append_only are false, boot loader
1187   // visibility boundaries are set to be _first_entry to the entry before
1188   // the _first_append_entry.  This would include:
1189   //   [-Xpatch:<dirs>];  [exploded build | modules]
1190   //
1191   // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1192   // be true at the same time.
1193   ClassPathEntry* e = (search_append_only ? _first_append_entry : _first_entry);
1194   ClassPathEntry* last_e =
1195       (search_append_only || DumpSharedSpaces ? NULL : _first_append_entry);
1196 
1197   {
1198     if (search_append_only) {
1199       // For the boot loader append path search, must calculate
1200       // the starting classpath_index prior to attempting to
1201       // load the classfile.
1202       ClassPathEntry *tmp_e = _first_entry;
1203       while ((tmp_e != NULL) && (tmp_e != _first_append_entry)) {
1204         tmp_e = tmp_e->next();
1205         ++classpath_index;
1206       }
1207     }
1208 
1209     // Attempt to load the classfile from either:
1210     //   - [-Xpatch:dir]; exploded build | modules
1211     //     or
1212     //   - [-Xbootclasspath/a]; [jvmti appended entries]
1213     while ((e != NULL) && (e != last_e)) {
1214       stream = e->open_stream(file_name, CHECK_NULL);
1215       if (!context.check(stream, classpath_index)) {
1216         return NULL;
1217       }
1218       if (NULL != stream) {
1219         break;
1220       }
1221       e = e->next();
1222       ++classpath_index;
1223     }
1224   }
1225 
1226   if (NULL == stream) {
1227     if (DumpSharedSpaces) {
1228       tty->print_cr("Preload Warning: Cannot find %s", class_name);
1229     }
1230     return NULL;
1231   }
1232 
1233   stream->set_verify(context.should_verify(classpath_index));
1234 
1235   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1236   Handle protection_domain;
1237 
1238   instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1239                                                                 name,
1240                                                                 loader_data,
1241                                                                 protection_domain,
1242                                                                 NULL, // host_klass
1243                                                                 NULL, // cp_patches
1244                                                                 NULL, // parsed_name
1245                                                                 THREAD);
1246   if (HAS_PENDING_EXCEPTION) {
1247     if (DumpSharedSpaces) {
1248       tty->print_cr("Preload Error: Failed to load %s", class_name);
1249     }
1250     return NULL;
1251   }
1252 
1253   jshort loader_type = classloader_type(name, e, classpath_index, CHECK_NULL);
1254   return context.record_result(classpath_index, loader_type, e, result, THREAD);
1255 }
1256 
1257 // Initialize the class loader's access to methods in libzip.  Parse and
1258 // process the boot classpath into a list ClassPathEntry objects.  Once
1259 // this list has been created, it must not change order (see class PackageInfo)
1260 // it can be appended to and is by jvmti and the kernel vm.
1261 
1262 void ClassLoader::initialize() {
1263   EXCEPTION_MARK;
1264 
1265   if (UsePerfData) {
1266     // jvmstat performance counters
1267     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1268     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1269     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1270     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1271     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1272     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1273     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1274     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1275     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1276     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1277 
1278     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1279     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1280     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1281     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1282     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1283     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1284     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1285     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1286     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1287     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1288     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1289     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1290     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1291 
1292 
1293     // The following performance counters are added for measuring the impact
1294     // of the bug fix of 6365597. They are mainly focused on finding out
1295     // the behavior of system & user-defined classloader lock, whether
1296     // ClassLoader.loadClass/findClass is being called synchronized or not.
1297     // Also two additional counters are created to see whether 'UnsyncloadClass'
1298     // flag is being set or not and how many times load_instance_class call
1299     // fails with linkageError etc.
1300     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1301                         "systemLoaderLockContentionRate");
1302     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1303                         "nonSystemLoaderLockContentionRate");
1304     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1305                         "jvmFindLoadedClassNoLockCalls");
1306     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1307                         "jvmDefineClassNoLockCalls");
1308 
1309     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1310                         "jniDefineClassNoLockCalls");
1311 
1312     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1313                         "unsafeDefineClassCalls");
1314 
1315     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1316     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1317                         "loadInstanceClassFailRate");
1318 
1319     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1320     if (UnsyncloadClass) {
1321       _isUnsyncloadClass->inc();
1322     }
1323   }
1324 
1325   // lookup zip library entry points
1326   load_zip_library();
1327   // lookup jimage library entry points
1328   load_jimage_library();
1329 #if INCLUDE_CDS
1330   // initialize search path
1331   if (DumpSharedSpaces) {
1332     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1333   }
1334 #endif
1335   setup_bootstrap_search_path();
1336 }
1337 
1338 #if INCLUDE_CDS
1339 void ClassLoader::initialize_shared_path() {
1340   if (DumpSharedSpaces) {
1341     ClassLoaderExt::setup_search_paths();
1342     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1343   }
1344 }
1345 #endif
1346 
1347 jlong ClassLoader::classloader_time_ms() {
1348   return UsePerfData ?
1349     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1350 }
1351 
1352 jlong ClassLoader::class_init_count() {
1353   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1354 }
1355 
1356 jlong ClassLoader::class_init_time_ms() {
1357   return UsePerfData ?
1358     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1359 }
1360 
1361 jlong ClassLoader::class_verify_time_ms() {
1362   return UsePerfData ?
1363     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1364 }
1365 
1366 jlong ClassLoader::class_link_count() {
1367   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1368 }
1369 
1370 jlong ClassLoader::class_link_time_ms() {
1371   return UsePerfData ?
1372     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1373 }
1374 
1375 int ClassLoader::compute_Object_vtable() {
1376   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1377   // code to determine actual value from file
1378   // Would be value '11' if finals were in vtable
1379   int JDK_1_2_Object_vtable_size = 5;
1380   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1381 }
1382 
1383 
1384 void classLoader_init() {
1385   ClassLoader::initialize();
1386 }
1387 
1388 
1389 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1390   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1391   if (CanonicalizeEntry != NULL) {
1392     JavaThread* THREAD = JavaThread::current();
1393     JNIEnv* env = THREAD->jni_environment();
1394     ResourceMark rm(THREAD);
1395 
1396     // os::native_path writes into orig_copy
1397     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1398     strcpy(orig_copy, orig);
1399     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1400       return false;
1401     }
1402   } else {
1403     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1404     strncpy(out, orig, len);
1405     out[len - 1] = '\0';
1406   }
1407   return true;
1408 }
1409 
1410 void ClassLoader::create_javabase() {
1411   Thread* THREAD = Thread::current();
1412 
1413   // Create java.base's module entry for the boot
1414   // class loader prior to loading j.l.Ojbect.
1415   ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1416 
1417   // Get module entry table
1418   ModuleEntryTable* null_cld_modules = null_cld->modules();
1419   if (null_cld_modules == NULL) {
1420     vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1421   }
1422 
1423   {
1424     MutexLocker ml(Module_lock, THREAD);
1425     ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld);
1426     if (jb_module == NULL) {
1427       vm_exit_during_initialization("Unable to create ModuleEntry for java.base");
1428     }
1429     ModuleEntryTable::set_javabase_module(jb_module);
1430   }
1431 
1432   // When looking for the jimage file, only
1433   // search the boot loader's module path which
1434   // can consist of [-Xpatch]; exploded build | modules
1435   // Do not search the boot loader's append path.
1436   ClassPathEntry* e = _first_entry;
1437   ClassPathEntry* last_e = _first_append_entry;
1438   while ((e != NULL) && (e != last_e)) {
1439     JImageFile *jimage = e->jimage();
1440     if (jimage != NULL && e->is_jrt()) {
1441       set_has_jimage(true);
1442 #if INCLUDE_CDS
1443       ClassLoader::initialize_module_loader_map(jimage);
1444 #endif
1445       return;
1446     }
1447     e = e->next();
1448   }
1449 }
1450 
1451 #ifndef PRODUCT
1452 
1453 // CompileTheWorld
1454 //
1455 // Iterates over all class path entries and forces compilation of all methods
1456 // in all classes found. Currently, only zip/jar archives are searched.
1457 //
1458 // The classes are loaded by the Java level bootstrap class loader, and the
1459 // initializer is called. If DelayCompilationDuringStartup is true (default),
1460 // the interpreter will run the initialization code. Note that forcing
1461 // initialization in this way could potentially lead to initialization order
1462 // problems, in which case we could just force the initialization bit to be set.
1463 
1464 
1465 // We need to iterate over the contents of a zip/jar file, so we replicate the
1466 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1467 // since jzfile already has a void* definition.
1468 //
1469 // Note that this is only used in debug mode.
1470 //
1471 // HotSpot integration note:
1472 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1473 
1474 
1475 // JDK 1.3 version
1476 typedef struct real_jzentry {         /* Zip file entry */
1477     char *name;                 /* entry name */
1478     jint time;                  /* modification time */
1479     jint size;                  /* size of uncompressed data */
1480     jint csize;                 /* size of compressed data (zero if uncompressed) */
1481     jint crc;                   /* crc of uncompressed data */
1482     char *comment;              /* optional zip file comment */
1483     jbyte *extra;               /* optional extra data */
1484     jint pos;                   /* position of LOC header (if negative) or data */
1485 } real_jzentry;
1486 
1487 typedef struct real_jzfile {  /* Zip file */
1488     char *name;                 /* zip file name */
1489     jint refs;                  /* number of active references */
1490     jint fd;                    /* open file descriptor */
1491     void *lock;                 /* read lock */
1492     char *comment;              /* zip file comment */
1493     char *msg;                  /* zip error message */
1494     void *entries;              /* array of hash cells */
1495     jint total;                 /* total number of entries */
1496     unsigned short *table;      /* Hash chain heads: indexes into entries */
1497     jint tablelen;              /* number of hash eads */
1498     real_jzfile *next;        /* next zip file in search list */
1499     jzentry *cache;             /* we cache the most recently freed jzentry */
1500     /* Information on metadata names in META-INF directory */
1501     char **metanames;           /* array of meta names (may have null names) */
1502     jint metacount;             /* number of slots in metanames array */
1503     /* If there are any per-entry comments, they are in the comments array */
1504     char **comments;
1505 } real_jzfile;
1506 
1507 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1508   // For now we only compile all methods in all classes in zip/jar files
1509   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1510   tty->cr();
1511 }
1512 
1513 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1514   real_jzfile* zip = (real_jzfile*) _zip;
1515   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1516   tty->cr();
1517   // Iterate over all entries in zip file
1518   for (int n = 0; ; n++) {
1519     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1520     if (ze == NULL) break;
1521     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1522   }
1523   if (HAS_PENDING_EXCEPTION) {
1524     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1525       CLEAR_PENDING_EXCEPTION;
1526       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1527       tty->print_cr("Increase class metadata storage if a limit was set");
1528     } else {
1529       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1530     }
1531   }
1532 }
1533 
1534 void ClassLoader::compile_the_world() {
1535   EXCEPTION_MARK;
1536   HandleMark hm(THREAD);
1537   ResourceMark rm(THREAD);
1538 
1539   // Find bootstrap loader
1540   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1541   // Iterate over all bootstrap class path entries
1542   ClassPathEntry* e = _first_entry;
1543   jlong start = os::javaTimeMillis();
1544   while (e != NULL) {
1545     // We stop at "modules" jimage, unless it is the first bootstrap path entry
1546     if (e->is_jrt() && e != _first_entry) break;
1547     e->compile_the_world(system_class_loader, CATCH);
1548     e = e->next();
1549   }
1550   jlong end = os::javaTimeMillis();
1551   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1552                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1553   {
1554     // Print statistics as if before normal exit:
1555     extern void print_statistics();
1556     print_statistics();
1557   }
1558   vm_exit(0);
1559 }
1560 
1561 int ClassLoader::_compile_the_world_class_counter = 0;
1562 int ClassLoader::_compile_the_world_method_counter = 0;
1563 static int _codecache_sweep_counter = 0;
1564 
1565 // Filter out all exceptions except OOMs
1566 static void clear_pending_exception_if_not_oom(TRAPS) {
1567   if (HAS_PENDING_EXCEPTION &&
1568       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1569     CLEAR_PENDING_EXCEPTION;
1570   }
1571   // The CHECK at the caller will propagate the exception out
1572 }
1573 
1574 /**
1575  * Returns if the given method should be compiled when doing compile-the-world.
1576  *
1577  * TODO:  This should be a private method in a CompileTheWorld class.
1578  */
1579 static bool can_be_compiled(methodHandle m, int comp_level) {
1580   assert(CompileTheWorld, "must be");
1581 
1582   // It's not valid to compile a native wrapper for MethodHandle methods
1583   // that take a MemberName appendix since the bytecode signature is not
1584   // correct.
1585   vmIntrinsics::ID iid = m->intrinsic_id();
1586   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1587     return false;
1588   }
1589 
1590   return CompilationPolicy::can_be_compiled(m, comp_level);
1591 }
1592 
1593 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1594   if (string_ends_with(name, ".class")) {
1595     // We have a .class file
1596     int len = (int)strlen(name);
1597     char buffer[2048];
1598     strncpy(buffer, name, len - 6);
1599     buffer[len-6] = 0;
1600     // If the file has a period after removing .class, it's not really a
1601     // valid class file.  The class loader will check everything else.
1602     if (strchr(buffer, '.') == NULL) {
1603       _compile_the_world_class_counter++;
1604       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1605 
1606       // Construct name without extension
1607       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1608       // Use loader to load and initialize class
1609       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1610       instanceKlassHandle k (THREAD, ik);
1611       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1612         k->initialize(THREAD);
1613       }
1614       bool exception_occurred = HAS_PENDING_EXCEPTION;
1615       clear_pending_exception_if_not_oom(CHECK);
1616       if (CompileTheWorldPreloadClasses && k.not_null()) {
1617         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1618         if (HAS_PENDING_EXCEPTION) {
1619           // If something went wrong in preloading we just ignore it
1620           clear_pending_exception_if_not_oom(CHECK);
1621           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1622         }
1623       }
1624 
1625       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1626         if (k.is_null() || exception_occurred) {
1627           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1628           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1629         } else {
1630           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1631           // Preload all classes to get around uncommon traps
1632           // Iterate over all methods in class
1633           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1634           for (int n = 0; n < k->methods()->length(); n++) {
1635             methodHandle m (THREAD, k->methods()->at(n));
1636             if (can_be_compiled(m, comp_level)) {
1637               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1638                 // Give sweeper a chance to keep up with CTW
1639                 VM_ForceSafepoint op;
1640                 VMThread::execute(&op);
1641                 _codecache_sweep_counter = 0;
1642               }
1643               // Force compilation
1644               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1645                                             methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1646               if (HAS_PENDING_EXCEPTION) {
1647                 clear_pending_exception_if_not_oom(CHECK);
1648                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1649               } else {
1650                 _compile_the_world_method_counter++;
1651               }
1652               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1653                 // Clobber the first compile and force second tier compilation
1654                 CompiledMethod* nm = m->code();
1655                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1656                   // Throw out the code so that the code cache doesn't fill up
1657                   nm->make_not_entrant();
1658                   m->clear_code();
1659                 }
1660                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1661                                               methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1662                 if (HAS_PENDING_EXCEPTION) {
1663                   clear_pending_exception_if_not_oom(CHECK);
1664                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1665                 } else {
1666                   _compile_the_world_method_counter++;
1667                 }
1668               }
1669             } else {
1670               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1671             }
1672 
1673             CompiledMethod* nm = m->code();
1674             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1675               // Throw out the code so that the code cache doesn't fill up
1676               nm->make_not_entrant();
1677               m->clear_code();
1678             }
1679           }
1680         }
1681       }
1682     }
1683   }
1684 }
1685 
1686 #endif //PRODUCT
1687 
1688 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1689 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1690 void PerfClassTraceTime::initialize() {
1691   if (!UsePerfData) return;
1692 
1693   if (_eventp != NULL) {
1694     // increment the event counter
1695     _eventp->inc();
1696   }
1697 
1698   // stop the current active thread-local timer to measure inclusive time
1699   _prev_active_event = -1;
1700   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1701      if (_timers[i].is_active()) {
1702        assert(_prev_active_event == -1, "should have only one active timer");
1703        _prev_active_event = i;
1704        _timers[i].stop();
1705      }
1706   }
1707 
1708   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1709     // start the inclusive timer if not recursively called
1710     _t.start();
1711   }
1712 
1713   // start thread-local timer of the given event type
1714    if (!_timers[_event_type].is_active()) {
1715     _timers[_event_type].start();
1716   }
1717 }
1718 
1719 PerfClassTraceTime::~PerfClassTraceTime() {
1720   if (!UsePerfData) return;
1721 
1722   // stop the thread-local timer as the event completes
1723   // and resume the thread-local timer of the event next on the stack
1724   _timers[_event_type].stop();
1725   jlong selftime = _timers[_event_type].ticks();
1726 
1727   if (_prev_active_event >= 0) {
1728     _timers[_prev_active_event].start();
1729   }
1730 
1731   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1732 
1733   // increment the counters only on the leaf call
1734   _t.stop();
1735   _timep->inc(_t.ticks());
1736   if (_selftimep != NULL) {
1737     _selftimep->inc(selftime);
1738   }
1739   // add all class loading related event selftime to the accumulated time counter
1740   ClassLoader::perf_accumulated_time()->inc(selftime);
1741 
1742   // reset the timer
1743   _timers[_event_type].reset();
1744 }