1 /*
   2  * Copyright (c) 1997, 2019, 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 "jvm.h"
  27 #include "jimage.hpp"
  28 #include "classfile/classFileStream.hpp"
  29 #include "classfile/classLoader.inline.hpp"
  30 #include "classfile/classLoaderData.inline.hpp"
  31 #include "classfile/classLoaderExt.hpp"
  32 #include "classfile/javaClasses.hpp"
  33 #include "classfile/moduleEntry.hpp"
  34 #include "classfile/modules.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/klassFactory.hpp"
  37 #include "classfile/symbolTable.hpp"
  38 #include "classfile/systemDictionary.hpp"
  39 #include "classfile/systemDictionaryShared.hpp"
  40 #include "classfile/vmSymbols.hpp"
  41 #include "compiler/compileBroker.hpp"
  42 #include "interpreter/bytecodeStream.hpp"
  43 #include "interpreter/oopMapCache.hpp"
  44 #include "logging/log.hpp"
  45 #include "logging/logStream.hpp"
  46 #include "logging/logTag.hpp"
  47 #include "memory/allocation.inline.hpp"
  48 #include "memory/filemap.hpp"
  49 #include "memory/oopFactory.hpp"
  50 #include "memory/resourceArea.hpp"
  51 #include "memory/universe.hpp"
  52 #include "oops/instanceKlass.hpp"
  53 #include "oops/instanceRefKlass.hpp"
  54 #include "oops/method.inline.hpp"
  55 #include "oops/objArrayOop.inline.hpp"
  56 #include "oops/oop.inline.hpp"
  57 #include "oops/symbol.hpp"
  58 #include "prims/jvm_misc.hpp"
  59 #include "runtime/arguments.hpp"
  60 #include "runtime/compilationPolicy.hpp"
  61 #include "runtime/handles.inline.hpp"
  62 #include "runtime/init.hpp"
  63 #include "runtime/interfaceSupport.inline.hpp"
  64 #include "runtime/java.hpp"
  65 #include "runtime/javaCalls.hpp"
  66 #include "runtime/os.inline.hpp"
  67 #include "runtime/threadCritical.hpp"
  68 #include "runtime/timer.hpp"
  69 #include "runtime/vm_version.hpp"
  70 #include "services/management.hpp"
  71 #include "services/threadService.hpp"
  72 #include "utilities/events.hpp"
  73 #include "utilities/hashtable.inline.hpp"
  74 #include "utilities/macros.hpp"
  75 #if INCLUDE_CDS
  76 #include "classfile/sharedPathsMiscInfo.hpp"
  77 #endif
  78 
  79 // Entry points in zip.dll for loading zip/jar file entries
  80 
  81 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
  82 typedef void (*ZipClose_t)(jzfile *zip);
  83 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  84 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  85 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
  86 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  87 typedef jint     (*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 GetNextEntry_t    GetNextEntry       = NULL;
  94 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  95 static ZipInflateFully_t ZipInflateFully    = NULL;
  96 static Crc32_t           Crc32              = NULL;
  97 
  98 // Entry points for jimage.dll for loading jimage file entries
  99 
 100 static JImageOpen_t                    JImageOpen             = NULL;
 101 static JImageClose_t                   JImageClose            = NULL;
 102 static JImagePackageToModule_t         JImagePackageToModule  = NULL;
 103 static JImageFindResource_t            JImageFindResource     = NULL;
 104 static JImageGetResource_t             JImageGetResource      = NULL;
 105 static JImageResourceIterator_t        JImageResourceIterator = NULL;
 106 
 107 // Globals
 108 
 109 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 110 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 111 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 112 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 113 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 114 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 115 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 116 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 117 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 118 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 119 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 120 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 121 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 122 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 123 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 124 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 125 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 126 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 127 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 128 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 129 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 130 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 131 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 132 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 133 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 134 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 135 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 136 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 137 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 138 
 139 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
 140 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
 141 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
 142 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
 143 ClassPathEntry* ClassLoader::_last_append_entry  = NULL;
 144 #if INCLUDE_CDS
 145 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
 146 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
 147 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
 148 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
 149 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 150 #endif
 151 
 152 // helper routines
 153 bool string_starts_with(const char* str, const char* str_to_find) {
 154   size_t str_len = strlen(str);
 155   size_t str_to_find_len = strlen(str_to_find);
 156   if (str_to_find_len > str_len) {
 157     return false;
 158   }
 159   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 160 }
 161 
 162 static const char* get_jimage_version_string() {
 163   static char version_string[10] = "";
 164   if (version_string[0] == '\0') {
 165     jio_snprintf(version_string, sizeof(version_string), "%d.%d",
 166                  VM_Version::vm_major_version(), VM_Version::vm_minor_version());
 167   }
 168   return (const char*)version_string;
 169 }
 170 
 171 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
 172   size_t str_len = strlen(str);
 173   size_t str_to_find_len = strlen(str_to_find);
 174   if (str_to_find_len > str_len) {
 175     return false;
 176   }
 177   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 178 }
 179 
 180 // Used to obtain the package name from a fully qualified class name.
 181 // It is the responsibility of the caller to establish a ResourceMark.
 182 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
 183   if (class_name == NULL) {
 184     if (bad_class_name != NULL) {
 185       *bad_class_name = true;
 186     }
 187     return NULL;
 188   }
 189 
 190   if (bad_class_name != NULL) {
 191     *bad_class_name = false;
 192   }
 193 
 194   const char* const last_slash = strrchr(class_name, '/');
 195   if (last_slash == NULL) {
 196     // No package name
 197     return NULL;
 198   }
 199 
 200   char* class_name_ptr = (char*) class_name;
 201   // Skip over '['s
 202   if (*class_name_ptr == '[') {
 203     do {
 204       class_name_ptr++;
 205     } while (*class_name_ptr == '[');
 206 
 207     // Fully qualified class names should not contain a 'L'.
 208     // Set bad_class_name to true to indicate that the package name
 209     // could not be obtained due to an error condition.
 210     // In this situation, is_same_class_package returns false.
 211     if (*class_name_ptr == 'L') {
 212       if (bad_class_name != NULL) {
 213         *bad_class_name = true;
 214       }
 215       return NULL;
 216     }
 217   }
 218 
 219   int length = last_slash - class_name_ptr;
 220 
 221   // A class name could have just the slash character in the name.
 222   if (length <= 0) {
 223     // No package name
 224     if (bad_class_name != NULL) {
 225       *bad_class_name = true;
 226     }
 227     return NULL;
 228   }
 229 
 230   // drop name after last slash (including slash)
 231   // Ex., "java/lang/String.class" => "java/lang"
 232   char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
 233   strncpy(pkg_name, class_name_ptr, length);
 234   *(pkg_name+length) = '\0';
 235 
 236   return (const char *)pkg_name;
 237 }
 238 
 239 // Given a fully qualified class name, find its defining package in the class loader's
 240 // package entry table.
 241 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
 242   ResourceMark rm(THREAD);
 243   const char *pkg_name = ClassLoader::package_from_name(class_name);
 244   if (pkg_name == NULL) {
 245     return NULL;
 246   }
 247   PackageEntryTable* pkgEntryTable = loader_data->packages();
 248   TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name);
 249   return pkgEntryTable->lookup_only(pkg_symbol);
 250 }
 251 
 252 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 253   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 254   strcpy(copy, dir);
 255   _dir = copy;
 256 }
 257 
 258 
 259 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 260   // construct full path name
 261   assert((_dir != NULL) && (name != NULL), "sanity");
 262   size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
 263   char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
 264   int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
 265   assert(len == (int)(path_len - 1), "sanity");
 266   // check if file exists
 267   struct stat st;
 268   if (os::stat(path, &st) == 0) {
 269     // found file, open it
 270     int file_handle = os::open(path, 0, 0);
 271     if (file_handle != -1) {
 272       // read contents into resource array
 273       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 274       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 275       // close file
 276       os::close(file_handle);
 277       // construct ClassFileStream
 278       if (num_read == (size_t)st.st_size) {
 279         if (UsePerfData) {
 280           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 281         }
 282         FREE_RESOURCE_ARRAY(char, path, path_len);
 283         // Resource allocated
 284         return new ClassFileStream(buffer,
 285                                    st.st_size,
 286                                    _dir,
 287                                    ClassFileStream::verify);
 288       }
 289     }
 290   }
 291   FREE_RESOURCE_ARRAY(char, path, path_len);
 292   return NULL;
 293 }
 294 
 295 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
 296   _zip = zip;
 297   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 298   strcpy(copy, zip_name);
 299   _zip_name = copy;
 300 }
 301 
 302 ClassPathZipEntry::~ClassPathZipEntry() {
 303   if (ZipClose != NULL) {
 304     (*ZipClose)(_zip);
 305   }
 306   FREE_C_HEAP_ARRAY(char, _zip_name);
 307 }
 308 
 309 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 310     // enable call to C land
 311   JavaThread* thread = JavaThread::current();
 312   ThreadToNativeFromVM ttn(thread);
 313   // check whether zip archive contains name
 314   jint name_len;
 315   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 316   if (entry == NULL) return NULL;
 317   u1* buffer;
 318   char name_buf[128];
 319   char* filename;
 320   if (name_len < 128) {
 321     filename = name_buf;
 322   } else {
 323     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 324   }
 325 
 326   // read contents into resource array
 327   int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 328   buffer = NEW_RESOURCE_ARRAY(u1, size);
 329   if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 330 
 331   // return result
 332   if (nul_terminate) {
 333     buffer[*filesize] = 0;
 334   }
 335   return buffer;
 336 }
 337 
 338 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 339   jint filesize;
 340   u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
 341   if (buffer == NULL) {
 342     return NULL;
 343   }
 344   if (UsePerfData) {
 345     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 346   }
 347   // Resource allocated
 348   return new ClassFileStream(buffer,
 349                              filesize,
 350                              _zip_name,
 351                              ClassFileStream::verify);
 352 }
 353 
 354 // invoke function for each entry in the zip file
 355 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 356   JavaThread* thread = JavaThread::current();
 357   HandleMark  handle_mark(thread);
 358   ThreadToNativeFromVM ttn(thread);
 359   for (int n = 0; ; n++) {
 360     jzentry * ze = ((*GetNextEntry)(_zip, n));
 361     if (ze == NULL) break;
 362     (*f)(ze->name, context);
 363   }
 364 }
 365 
 366 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
 367 
 368 void ClassPathImageEntry::close_jimage() {
 369   if (_jimage != NULL) {
 370     (*JImageClose)(_jimage);
 371     _jimage = NULL;
 372   }
 373 }
 374 
 375 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
 376   ClassPathEntry(),
 377   _jimage(jimage) {
 378   guarantee(jimage != NULL, "jimage file is null");
 379   guarantee(name != NULL, "jimage file name is null");
 380   assert(_singleton == NULL, "VM supports only one jimage");
 381   DEBUG_ONLY(_singleton = this);
 382   size_t len = strlen(name) + 1;
 383   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 384   strncpy((char *)_name, name, len);
 385 }
 386 
 387 ClassPathImageEntry::~ClassPathImageEntry() {
 388   assert(_singleton == this, "must be");
 389   DEBUG_ONLY(_singleton = NULL);
 390 
 391   if (_name != NULL) {
 392     FREE_C_HEAP_ARRAY(const char, _name);
 393     _name = NULL;
 394   }
 395   if (_jimage != NULL) {
 396     (*JImageClose)(_jimage);
 397     _jimage = NULL;
 398   }
 399 }
 400 
 401 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 402   return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
 403 }
 404 
 405 // For a class in a named module, look it up in the jimage file using this syntax:
 406 //    /<module-name>/<package-name>/<base-class>
 407 //
 408 // Assumptions:
 409 //     1. There are no unnamed modules in the jimage file.
 410 //     2. A package is in at most one module in the jimage file.
 411 //
 412 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
 413   jlong size;
 414   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 415 
 416   if (location == 0) {
 417     ResourceMark rm;
 418     const char* pkg_name = ClassLoader::package_from_name(name);
 419 
 420     if (pkg_name != NULL) {
 421       if (!Universe::is_module_initialized()) {
 422         location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
 423       } else {
 424         PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
 425         if (package_entry != NULL) {
 426           ResourceMark rm;
 427           // Get the module name
 428           ModuleEntry* module = package_entry->module();
 429           assert(module != NULL, "Boot classLoader package missing module");
 430           assert(module->is_named(), "Boot classLoader package is in unnamed module");
 431           const char* module_name = module->name()->as_C_string();
 432           if (module_name != NULL) {
 433             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 434           }
 435         }
 436       }
 437     }
 438   }
 439   if (location != 0) {
 440     if (UsePerfData) {
 441       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 442     }
 443     char* data = NEW_RESOURCE_ARRAY(char, size);
 444     (*JImageGetResource)(_jimage, location, data, size);
 445     // Resource allocated
 446     assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
 447     return new ClassFileStream((u1*)data,
 448                                (int)size,
 449                                _name,
 450                                ClassFileStream::verify,
 451                                true); // from_boot_loader_modules_image
 452   }
 453 
 454   return NULL;
 455 }
 456 
 457 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
 458                                                     const char* module_name,
 459                                                     const char* file_name,
 460                                                     jlong &size) {
 461   return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
 462 }
 463 
 464 bool ClassPathImageEntry::is_modules_image() const {
 465   assert(this == _singleton, "VM supports a single jimage");
 466   assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
 467   return true;
 468 }
 469 
 470 #if INCLUDE_CDS
 471 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 472   assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "only called at dump time");
 473   tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
 474   vm_exit_during_initialization(error, message);
 475 }
 476 #endif
 477 
 478 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
 479   _module_name = module_name;
 480   _module_first_entry = NULL;
 481   _module_last_entry = NULL;
 482 }
 483 
 484 ModuleClassPathList::~ModuleClassPathList() {
 485   // Clean out each ClassPathEntry on list
 486   ClassPathEntry* e = _module_first_entry;
 487   while (e != NULL) {
 488     ClassPathEntry* next_entry = e->next();
 489     delete e;
 490     e = next_entry;
 491   }
 492 }
 493 
 494 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
 495   if (new_entry != NULL) {
 496     if (_module_last_entry == NULL) {
 497       _module_first_entry = _module_last_entry = new_entry;
 498     } else {
 499       _module_last_entry->set_next(new_entry);
 500       _module_last_entry = new_entry;
 501     }
 502   }
 503 }
 504 
 505 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 506   LogTarget(Info, class, path) lt;
 507   if (lt.is_enabled()) {
 508     LogStream ls(lt);
 509     if (msg) {
 510       ls.print("%s", msg);
 511     }
 512     if (name) {
 513       if (strlen(name) < 256) {
 514         ls.print("%s", name);
 515       } else {
 516         // For very long paths, we need to print each character separately,
 517         // as print_cr() has a length limit
 518         while (name[0] != '\0') {
 519           ls.print("%c", name[0]);
 520           name++;
 521         }
 522       }
 523     }
 524     ls.cr();
 525   }
 526 }
 527 
 528 void ClassLoader::setup_bootstrap_search_path() {
 529   const char* sys_class_path = Arguments::get_sysclasspath();
 530   assert(sys_class_path != NULL, "System boot class path must not be NULL");
 531   if (PrintSharedArchiveAndExit) {
 532     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 533     // the same as the bootcp of the shared archive.
 534   } else {
 535     trace_class_path("bootstrap loader class path=", sys_class_path);
 536   }
 537 #if INCLUDE_CDS
 538   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
 539     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 540   }
 541 #endif
 542   setup_boot_search_path(sys_class_path);
 543 }
 544 
 545 #if INCLUDE_CDS
 546 int ClassLoader::get_shared_paths_misc_info_size() {
 547   return _shared_paths_misc_info->get_used_bytes();
 548 }
 549 
 550 void* ClassLoader::get_shared_paths_misc_info() {
 551   return _shared_paths_misc_info->buffer();
 552 }
 553 
 554 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size, bool is_static) {
 555   SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size);
 556   bool result = checker->check(is_static);
 557   delete checker;
 558   return result;
 559 }
 560 
 561 void ClassLoader::setup_app_search_path(const char *class_path) {
 562 
 563   assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "Sanity");
 564 
 565   Thread* THREAD = Thread::current();
 566   int len = (int)strlen(class_path);
 567   int end = 0;
 568 
 569   // Iterate over class path entries
 570   for (int start = 0; start < len; start = end) {
 571     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 572       end++;
 573     }
 574     EXCEPTION_MARK;
 575     ResourceMark rm(THREAD);
 576     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 577     strncpy(path, &class_path[start], end - start);
 578     path[end - start] = '\0';
 579 
 580     update_class_path_entry_list(path, false, false);
 581 
 582     while (class_path[end] == os::path_separator()[0]) {
 583       end++;
 584     }
 585   }
 586 }
 587 
 588 void ClassLoader::add_to_module_path_entries(const char* path,
 589                                              ClassPathEntry* entry) {
 590   assert(entry != NULL, "ClassPathEntry should not be NULL");
 591   assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
 592 
 593   // The entry does not exist, add to the list
 594   if (_module_path_entries == NULL) {
 595     assert(_last_module_path_entry == NULL, "Sanity");
 596     _module_path_entries = _last_module_path_entry = entry;
 597   } else {
 598     _last_module_path_entry->set_next(entry);
 599     _last_module_path_entry = entry;
 600   }
 601 }
 602 
 603 // Add a module path to the _module_path_entries list.
 604 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
 605   assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
 606   struct stat st;
 607   if (os::stat(path, &st) != 0) {
 608     tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
 609       errno, os::errno_name(errno), path);
 610     vm_exit_during_initialization();
 611   }
 612   // File or directory found
 613   ClassPathEntry* new_entry = NULL;
 614   new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
 615                                       false /*is_boot_append */, CHECK);
 616   if (new_entry == NULL) {
 617     return;
 618   }
 619 
 620   add_to_module_path_entries(path, new_entry);
 621   return;
 622 }
 623 
 624 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
 625   update_module_path_entry_list(path, THREAD);
 626 }
 627 
 628 #endif // INCLUDE_CDS
 629 
 630 void ClassLoader::close_jrt_image() {
 631   // Not applicable for exploded builds
 632   if (!ClassLoader::has_jrt_entry()) return;
 633   _jrt_entry->close_jimage();
 634 }
 635 
 636 // Construct the array of module/path pairs as specified to --patch-module
 637 // for the boot loader to search ahead of the jimage, if the class being
 638 // loaded is defined to a module that has been specified to --patch-module.
 639 void ClassLoader::setup_patch_mod_entries() {
 640   Thread* THREAD = Thread::current();
 641   GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
 642   int num_of_entries = patch_mod_args->length();
 643 
 644 
 645   // Set up the boot loader's _patch_mod_entries list
 646   _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
 647 
 648   for (int i = 0; i < num_of_entries; i++) {
 649     const char* module_name = (patch_mod_args->at(i))->module_name();
 650     Symbol* const module_sym = SymbolTable::new_symbol(module_name);
 651     assert(module_sym != NULL, "Failed to obtain Symbol for module name");
 652     ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
 653 
 654     char* class_path = (patch_mod_args->at(i))->path_string();
 655     int len = (int)strlen(class_path);
 656     int end = 0;
 657     // Iterate over the module's class path entries
 658     for (int start = 0; start < len; start = end) {
 659       while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 660         end++;
 661       }
 662       EXCEPTION_MARK;
 663       ResourceMark rm(THREAD);
 664       char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 665       strncpy(path, &class_path[start], end - start);
 666       path[end - start] = '\0';
 667 
 668       struct stat st;
 669       if (os::stat(path, &st) == 0) {
 670         // File or directory found
 671         ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 672         // If the path specification is valid, enter it into this module's list
 673         if (new_entry != NULL) {
 674           module_cpl->add_to_list(new_entry);
 675         }
 676       }
 677 
 678       while (class_path[end] == os::path_separator()[0]) {
 679         end++;
 680       }
 681     }
 682 
 683     // Record the module into the list of --patch-module entries only if
 684     // valid ClassPathEntrys have been created
 685     if (module_cpl->module_first_entry() != NULL) {
 686       _patch_mod_entries->push(module_cpl);
 687     }
 688   }
 689 }
 690 
 691 // Determine whether the module has been patched via the command-line
 692 // option --patch-module
 693 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
 694   if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
 695     int table_len = _patch_mod_entries->length();
 696     for (int i = 0; i < table_len; i++) {
 697       ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
 698       if (module_name->fast_compare(patch_mod->module_name()) == 0) {
 699         return true;
 700       }
 701     }
 702   }
 703   return false;
 704 }
 705 
 706 // Set up the _jrt_entry if present and boot append path
 707 void ClassLoader::setup_boot_search_path(const char *class_path) {
 708   int len = (int)strlen(class_path);
 709   int end = 0;
 710   bool set_base_piece = true;
 711 
 712 #if INCLUDE_CDS
 713   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
 714     if (!Arguments::has_jimage()) {
 715       vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
 716     }
 717   }
 718 #endif
 719 
 720   // Iterate over class path entries
 721   for (int start = 0; start < len; start = end) {
 722     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 723       end++;
 724     }
 725     EXCEPTION_MARK;
 726     ResourceMark rm(THREAD);
 727     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 728     strncpy(path, &class_path[start], end - start);
 729     path[end - start] = '\0';
 730 
 731     if (set_base_piece) {
 732       // The first time through the bootstrap_search setup, it must be determined
 733       // what the base or core piece of the boot loader search is.  Either a java runtime
 734       // image is present or this is an exploded module build situation.
 735       assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
 736              "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
 737       struct stat st;
 738       if (os::stat(path, &st) == 0) {
 739         // Directory found
 740         ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 741 
 742         // Check for a jimage
 743         if (Arguments::has_jimage()) {
 744           assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
 745           _jrt_entry = new_entry;
 746           assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
 747           assert(_jrt_entry->jimage() != NULL, "No java runtime image");
 748         }
 749       } else {
 750         // If path does not exist, exit
 751         vm_exit_during_initialization("Unable to establish the boot loader search path", path);
 752       }
 753       set_base_piece = false;
 754     } else {
 755       // Every entry on the system boot class path after the initial base piece,
 756       // which is set by os::set_boot_path(), is considered an appended entry.
 757       update_class_path_entry_list(path, false, true);
 758     }
 759 
 760     while (class_path[end] == os::path_separator()[0]) {
 761       end++;
 762     }
 763   }
 764 }
 765 
 766 // During an exploded modules build, each module defined to the boot loader
 767 // will be added to the ClassLoader::_exploded_entries array.
 768 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
 769   assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
 770   assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
 771 
 772   // Find the module's symbol
 773   ResourceMark rm(THREAD);
 774   const char *module_name = module_sym->as_C_string();
 775   const char *home = Arguments::get_java_home();
 776   const char file_sep = os::file_separator()[0];
 777   // 10 represents the length of "modules" + 2 file separators + \0
 778   size_t len = strlen(home) + strlen(module_name) + 10;
 779   char *path = NEW_RESOURCE_ARRAY(char, len);
 780   jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
 781 
 782   struct stat st;
 783   if (os::stat(path, &st) == 0) {
 784     // Directory found
 785     ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 786 
 787     // If the path specification is valid, enter it into this module's list.
 788     // There is no need to check for duplicate modules in the exploded entry list,
 789     // since no two modules with the same name can be defined to the boot loader.
 790     // This is checked at module definition time in Modules::define_module.
 791     if (new_entry != NULL) {
 792       ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
 793       module_cpl->add_to_list(new_entry);
 794       {
 795         MutexLocker ml(Module_lock, THREAD);
 796         _exploded_entries->push(module_cpl);
 797       }
 798       log_info(class, load)("path: %s", path);
 799     }
 800   }
 801 }
 802 
 803 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 804                                                      bool throw_exception,
 805                                                      bool is_boot_append, TRAPS) {
 806   JavaThread* thread = JavaThread::current();
 807   ClassPathEntry* new_entry = NULL;
 808   if ((st->st_mode & S_IFMT) == S_IFREG) {
 809     ResourceMark rm(thread);
 810     // Regular file, should be a zip or jimage file
 811     // Canonicalized filename
 812     char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
 813     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 814       // This matches the classic VM
 815       if (throw_exception) {
 816         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 817       } else {
 818         return NULL;
 819       }
 820     }
 821     jint error;
 822     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 823     if (jimage != NULL) {
 824       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 825     } else {
 826       char* error_msg = NULL;
 827       jzfile* zip;
 828       {
 829         // enable call to C land
 830         ThreadToNativeFromVM ttn(thread);
 831         HandleMark hm(thread);
 832         zip = (*ZipOpen)(canonical_path, &error_msg);
 833       }
 834       if (zip != NULL && error_msg == NULL) {
 835         new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
 836       } else {
 837         char *msg;
 838         if (error_msg == NULL) {
 839           msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
 840           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 841         } else {
 842           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 843           msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
 844           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 845         }
 846         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 847         if (throw_exception && is_init_completed()) {
 848           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 849         } else {
 850           return NULL;
 851         }
 852       }
 853     }
 854     log_info(class, path)("opened: %s", path);
 855     log_info(class, load)("opened: %s", path);
 856   } else {
 857     // Directory
 858     new_entry = new ClassPathDirEntry(path);
 859     log_info(class, load)("path: %s", path);
 860   }
 861   return new_entry;
 862 }
 863 
 864 
 865 // Create a class path zip entry for a given path (return NULL if not found
 866 // or zip/JAR file cannot be opened)
 867 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
 868   // check for a regular file
 869   struct stat st;
 870   if (os::stat(path, &st) == 0) {
 871     if ((st.st_mode & S_IFMT) == S_IFREG) {
 872       char canonical_path[JVM_MAXPATHLEN];
 873       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 874         char* error_msg = NULL;
 875         jzfile* zip;
 876         {
 877           // enable call to C land
 878           JavaThread* thread = JavaThread::current();
 879           ThreadToNativeFromVM ttn(thread);
 880           HandleMark hm(thread);
 881           zip = (*ZipOpen)(canonical_path, &error_msg);
 882         }
 883         if (zip != NULL && error_msg == NULL) {
 884           // create using canonical path
 885           return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
 886         }
 887       }
 888     }
 889   }
 890   return NULL;
 891 }
 892 
 893 // returns true if entry already on class path
 894 bool ClassLoader::contains_append_entry(const char* name) {
 895   ClassPathEntry* e = _first_append_entry;
 896   while (e != NULL) {
 897     // assume zip entries have been canonicalized
 898     if (strcmp(name, e->name()) == 0) {
 899       return true;
 900     }
 901     e = e->next();
 902   }
 903   return false;
 904 }
 905 
 906 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
 907   if (new_entry != NULL) {
 908     if (_last_append_entry == NULL) {
 909       assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
 910       _first_append_entry = _last_append_entry = new_entry;
 911     } else {
 912       _last_append_entry->set_next(new_entry);
 913       _last_append_entry = new_entry;
 914     }
 915   }
 916 }
 917 
 918 // Record the path entries specified in -cp during dump time. The recorded
 919 // information will be used at runtime for loading the archived app classes.
 920 //
 921 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
 922 // loading app classes. Instead, the app class are loaded by the
 923 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
 924 void ClassLoader::add_to_app_classpath_entries(const char* path,
 925                                                ClassPathEntry* entry,
 926                                                bool check_for_duplicates) {
 927 #if INCLUDE_CDS
 928   assert(entry != NULL, "ClassPathEntry should not be NULL");
 929   ClassPathEntry* e = _app_classpath_entries;
 930   if (check_for_duplicates) {
 931     while (e != NULL) {
 932       if (strcmp(e->name(), entry->name()) == 0) {
 933         // entry already exists
 934         return;
 935       }
 936       e = e->next();
 937     }
 938   }
 939 
 940   // The entry does not exist, add to the list
 941   if (_app_classpath_entries == NULL) {
 942     assert(_last_app_classpath_entry == NULL, "Sanity");
 943     _app_classpath_entries = _last_app_classpath_entry = entry;
 944   } else {
 945     _last_app_classpath_entry->set_next(entry);
 946     _last_app_classpath_entry = entry;
 947   }
 948 
 949   if (entry->is_jar_file()) {
 950     ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
 951   }
 952 #endif
 953 }
 954 
 955 // Returns true IFF the file/dir exists and the entry was successfully created.
 956 bool ClassLoader::update_class_path_entry_list(const char *path,
 957                                                bool check_for_duplicates,
 958                                                bool is_boot_append,
 959                                                bool throw_exception) {
 960   struct stat st;
 961   if (os::stat(path, &st) == 0) {
 962     // File or directory found
 963     ClassPathEntry* new_entry = NULL;
 964     Thread* THREAD = Thread::current();
 965     new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
 966     if (new_entry == NULL) {
 967       return false;
 968     }
 969 
 970     // Do not reorder the bootclasspath which would break get_system_package().
 971     // Add new entry to linked list
 972     if (is_boot_append) {
 973       add_to_boot_append_entries(new_entry);
 974     } else {
 975       add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
 976     }
 977     return true;
 978   } else {
 979 #if INCLUDE_CDS
 980     if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
 981       _shared_paths_misc_info->add_nonexist_path(path);
 982     }
 983 #endif
 984     return false;
 985   }
 986 }
 987 
 988 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
 989   ResourceMark rm;
 990   int num_of_entries = module_list->length();
 991   for (int i = 0; i < num_of_entries; i++) {
 992     ClassPathEntry* e;
 993     ModuleClassPathList* mpl = module_list->at(i);
 994     tty->print("%s=", mpl->module_name()->as_C_string());
 995     e = mpl->module_first_entry();
 996     while (e != NULL) {
 997       tty->print("%s", e->name());
 998       e = e->next();
 999       if (e != NULL) {
1000         tty->print("%s", os::path_separator());
1001       }
1002     }
1003     tty->print(" ;");
1004   }
1005 }
1006 
1007 void ClassLoader::print_bootclasspath() {
1008   ClassPathEntry* e;
1009   tty->print("[bootclasspath= ");
1010 
1011   // Print --patch-module module/path specifications first
1012   if (_patch_mod_entries != NULL) {
1013     print_module_entry_table(_patch_mod_entries);
1014   }
1015 
1016   // [jimage | exploded modules build]
1017   if (has_jrt_entry()) {
1018     // Print the location of the java runtime image
1019     tty->print("%s ;", _jrt_entry->name());
1020   } else {
1021     // Print exploded module build path specifications
1022     if (_exploded_entries != NULL) {
1023       print_module_entry_table(_exploded_entries);
1024     }
1025   }
1026 
1027   // appended entries
1028   e = _first_append_entry;
1029   while (e != NULL) {
1030     tty->print("%s ;", e->name());
1031     e = e->next();
1032   }
1033   tty->print_cr("]");
1034 }
1035 
1036 void ClassLoader::load_zip_library() {
1037   assert(ZipOpen == NULL, "should not load zip library twice");
1038   // First make sure native library is loaded
1039   os::native_java_library();
1040   // Load zip library
1041   char path[JVM_MAXPATHLEN];
1042   char ebuf[1024];
1043   void* handle = NULL;
1044   if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1045     handle = os::dll_load(path, ebuf, sizeof ebuf);
1046   }
1047   if (handle == NULL) {
1048     vm_exit_during_initialization("Unable to load ZIP library", path);
1049   }
1050   // Lookup zip entry points
1051   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1052   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1053   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1054   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1055   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1056   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1057   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1058 
1059   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1060   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1061       GetNextEntry == NULL || Crc32 == NULL) {
1062     vm_exit_during_initialization("Corrupted ZIP library", path);
1063   }
1064 
1065   if (ZipInflateFully == NULL) {
1066     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1067   }
1068 
1069   // Lookup canonicalize entry in libjava.dll
1070   void *javalib_handle = os::native_java_library();
1071   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1072   // This lookup only works on 1.3. Do not check for non-null here
1073 }
1074 
1075 void ClassLoader::load_jimage_library() {
1076   // First make sure native library is loaded
1077   os::native_java_library();
1078   // Load jimage library
1079   char path[JVM_MAXPATHLEN];
1080   char ebuf[1024];
1081   void* handle = NULL;
1082   if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1083     handle = os::dll_load(path, ebuf, sizeof ebuf);
1084   }
1085   if (handle == NULL) {
1086     vm_exit_during_initialization("Unable to load jimage library", path);
1087   }
1088 
1089   // Lookup jimage entry points
1090   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1091   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1092   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1093   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1094   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1095   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1096   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1097   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1098   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1099   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1100   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1101   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1102 }
1103 
1104 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1105   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1106 }
1107 
1108 int ClassLoader::crc32(int crc, const char* buf, int len) {
1109   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1110   return (*Crc32)(crc, (const jbyte*)buf, len);
1111 }
1112 
1113 // Function add_package extracts the package from the fully qualified class name
1114 // and checks if the package is in the boot loader's package entry table.  If so,
1115 // then it sets the classpath_index in the package entry record.
1116 //
1117 // The classpath_index field is used to find the entry on the boot loader class
1118 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1119 // in an unnamed module.  It is also used to indicate (for all packages whose
1120 // classes are loaded by the boot loader) that at least one of the package's
1121 // classes has been loaded.
1122 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1123   assert(fullq_class_name != NULL, "just checking");
1124 
1125   // Get package name from fully qualified class name.
1126   ResourceMark rm;
1127   const char *cp = package_from_name(fullq_class_name);
1128   if (cp != NULL) {
1129     PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1130     TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1131     PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1132     if (pkg_entry != NULL) {
1133       assert(classpath_index != -1, "Unexpected classpath_index");
1134       pkg_entry->set_classpath_index(classpath_index);
1135     } else {
1136       return false;
1137     }
1138   }
1139   return true;
1140 }
1141 
1142 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1143   // Look up the name in the boot loader's package entry table.
1144   if (name != NULL) {
1145     TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1146     // Look for the package entry in the boot loader's package entry table.
1147     PackageEntry* package =
1148       ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1149 
1150     // Return NULL if package does not exist or if no classes in that package
1151     // have been loaded.
1152     if (package != NULL && package->has_loaded_class()) {
1153       ModuleEntry* module = package->module();
1154       if (module->location() != NULL) {
1155         ResourceMark rm(THREAD);
1156         Handle ml = java_lang_String::create_from_str(
1157           module->location()->as_C_string(), THREAD);
1158         return ml();
1159       }
1160       // Return entry on boot loader class path.
1161       Handle cph = java_lang_String::create_from_str(
1162         ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1163       return cph();
1164     }
1165   }
1166   return NULL;
1167 }
1168 
1169 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1170   ResourceMark rm(THREAD);
1171   // List of pointers to PackageEntrys that have loaded classes.
1172   GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1173   {
1174     MutexLocker ml(Module_lock, THREAD);
1175 
1176     PackageEntryTable* pe_table =
1177       ClassLoaderData::the_null_class_loader_data()->packages();
1178 
1179     // Collect the packages that have at least one loaded class.
1180     for (int x = 0; x < pe_table->table_size(); x++) {
1181       for (PackageEntry* package_entry = pe_table->bucket(x);
1182            package_entry != NULL;
1183            package_entry = package_entry->next()) {
1184         if (package_entry->has_loaded_class()) {
1185           loaded_class_pkgs->append(package_entry);
1186         }
1187       }
1188     }
1189   }
1190 
1191 
1192   // Allocate objArray and fill with java.lang.String
1193   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1194                                            loaded_class_pkgs->length(), CHECK_NULL);
1195   objArrayHandle result(THREAD, r);
1196   for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1197     PackageEntry* package_entry = loaded_class_pkgs->at(x);
1198     Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1199     result->obj_at_put(x, str());
1200   }
1201   return result();
1202 }
1203 
1204 // caller needs ResourceMark
1205 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1206                                                   int class_name_len) {
1207   assert(class_name != NULL, "invariant");
1208   assert((int)strlen(class_name) == class_name_len, "invariant");
1209 
1210   static const char class_suffix[] = ".class";
1211   size_t class_suffix_len = sizeof(class_suffix);
1212 
1213   char* const file_name = NEW_RESOURCE_ARRAY(char,
1214                                              class_name_len +
1215                                              class_suffix_len); // includes term NULL
1216 
1217   strncpy(file_name, class_name, class_name_len);
1218   strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1219 
1220   return file_name;
1221 }
1222 
1223 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1224                                       const GrowableArray<ModuleClassPathList*>* const module_list) {
1225   int num_of_entries = module_list->length();
1226   const Symbol* class_module_name = mod_entry->name();
1227 
1228   // Loop through all the modules in either the patch-module or exploded entries looking for module
1229   for (int i = 0; i < num_of_entries; i++) {
1230     ModuleClassPathList* module_cpl = module_list->at(i);
1231     Symbol* module_cpl_name = module_cpl->module_name();
1232 
1233     if (module_cpl_name->fast_compare(class_module_name) == 0) {
1234       // Class' module has been located.
1235       return module_cpl->module_first_entry();
1236     }
1237   }
1238   return NULL;
1239 }
1240 
1241 
1242 // Search either the patch-module or exploded build entries for class.
1243 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1244                                                     const char* const class_name,
1245                                                     const char* const file_name,
1246                                                     TRAPS) {
1247   ClassFileStream* stream = NULL;
1248 
1249   // Find the class' defining module in the boot loader's module entry table
1250   PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1251   ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1252 
1253   // If the module system has not defined java.base yet, then
1254   // classes loaded are assumed to be defined to java.base.
1255   // When java.base is eventually defined by the module system,
1256   // all packages of classes that have been previously loaded
1257   // are verified in ModuleEntryTable::verify_javabase_packages().
1258   if (!Universe::is_module_initialized() &&
1259       !ModuleEntryTable::javabase_defined() &&
1260       mod_entry == NULL) {
1261     mod_entry = ModuleEntryTable::javabase_moduleEntry();
1262   }
1263 
1264   // The module must be a named module
1265   ClassPathEntry* e = NULL;
1266   if (mod_entry != NULL && mod_entry->is_named()) {
1267     if (module_list == _exploded_entries) {
1268       // The exploded build entries can be added to at any time so a lock is
1269       // needed when searching them.
1270       assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1271       MutexLocker ml(Module_lock, THREAD);
1272       e = find_first_module_cpe(mod_entry, module_list);
1273     } else {
1274       e = find_first_module_cpe(mod_entry, module_list);
1275     }
1276   }
1277 
1278   // Try to load the class from the module's ClassPathEntry list.
1279   while (e != NULL) {
1280     stream = e->open_stream(file_name, CHECK_NULL);
1281     // No context.check is required since CDS is not supported
1282     // for an exploded modules build or if --patch-module is specified.
1283     if (NULL != stream) {
1284       return stream;
1285     }
1286     e = e->next();
1287   }
1288   // If the module was located, break out even if the class was not
1289   // located successfully from that module's ClassPathEntry list.
1290   // There will not be another valid entry for that module.
1291   return NULL;
1292 }
1293 
1294 // Called by the boot classloader to load classes
1295 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1296   assert(name != NULL, "invariant");
1297   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1298 
1299   ResourceMark rm(THREAD);
1300   HandleMark hm(THREAD);
1301 
1302   const char* const class_name = name->as_C_string();
1303 
1304   EventMark m("loading class %s", class_name);
1305 
1306   const char* const file_name = file_name_for_class_name(class_name,
1307                                                          name->utf8_length());
1308   assert(file_name != NULL, "invariant");
1309 
1310   // Lookup stream for parsing .class file
1311   ClassFileStream* stream = NULL;
1312   s2 classpath_index = 0;
1313   ClassPathEntry* e = NULL;
1314 
1315   // If search_append_only is true, boot loader visibility boundaries are
1316   // set to be _first_append_entry to the end. This includes:
1317   //   [-Xbootclasspath/a]; [jvmti appended entries]
1318   //
1319   // If search_append_only is false, boot loader visibility boundaries are
1320   // set to be the --patch-module entries plus the base piece. This includes:
1321   //   [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1322   //
1323 
1324   // Load Attempt #1: --patch-module
1325   // Determine the class' defining module.  If it appears in the _patch_mod_entries,
1326   // attempt to load the class from those locations specific to the module.
1327   // Specifications to --patch-module can contain a partial number of classes
1328   // that are part of the overall module definition.  So if a particular class is not
1329   // found within its module specification, the search should continue to Load Attempt #2.
1330   // Note: The --patch-module entries are never searched if the boot loader's
1331   //       visibility boundary is limited to only searching the append entries.
1332   if (_patch_mod_entries != NULL && !search_append_only) {
1333     // At CDS dump time, the --patch-module entries are ignored. That means a
1334     // class is still loaded from the runtime image even if it might
1335     // appear in the _patch_mod_entries. The runtime shared class visibility
1336     // check will determine if a shared class is visible based on the runtime
1337     // environemnt, including the runtime --patch-module setting.
1338     //
1339     // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1340     // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1341     assert(!DynamicDumpSharedSpaces, "sanity");
1342     if (!DumpSharedSpaces) {
1343       stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1344     }
1345   }
1346 
1347   // Load Attempt #2: [jimage | exploded build]
1348   if (!search_append_only && (NULL == stream)) {
1349     if (has_jrt_entry()) {
1350       e = _jrt_entry;
1351       stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1352     } else {
1353       // Exploded build - attempt to locate class in its defining module's location.
1354       assert(_exploded_entries != NULL, "No exploded build entries present");
1355       stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1356     }
1357   }
1358 
1359   // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1360   if (search_append_only && (NULL == stream)) {
1361     // For the boot loader append path search, the starting classpath_index
1362     // for the appended piece is always 1 to account for either the
1363     // _jrt_entry or the _exploded_entries.
1364     assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1365     classpath_index = 1;
1366 
1367     e = _first_append_entry;
1368     while (e != NULL) {
1369       stream = e->open_stream(file_name, CHECK_NULL);
1370       if (NULL != stream) {
1371         break;
1372       }
1373       e = e->next();
1374       ++classpath_index;
1375     }
1376   }
1377 
1378   if (NULL == stream) {
1379     return NULL;
1380   }
1381 
1382   stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1383 
1384   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1385   Handle protection_domain;
1386 
1387   InstanceKlass* result = KlassFactory::create_from_stream(stream,
1388                                                            name,
1389                                                            loader_data,
1390                                                            protection_domain,
1391                                                            NULL, // unsafe_anonymous_host
1392                                                            NULL, // cp_patches
1393                                                            THREAD);
1394   if (HAS_PENDING_EXCEPTION) {
1395     if (DumpSharedSpaces) {
1396       tty->print_cr("Preload Error: Failed to load %s", class_name);
1397     }
1398     return NULL;
1399   }
1400 
1401   if (!add_package(file_name, classpath_index, THREAD)) {
1402     return NULL;
1403   }
1404 
1405   return result;
1406 }
1407 
1408 #if INCLUDE_CDS
1409 char* ClassLoader::skip_uri_protocol(char* source) {
1410   if (strncmp(source, "file:", 5) == 0) {
1411     // file: protocol path could start with file:/ or file:///
1412     // locate the char after all the forward slashes
1413     int offset = 5;
1414     while (*(source + offset) == '/') {
1415         offset++;
1416     }
1417     source += offset;
1418   // for non-windows platforms, move back one char as the path begins with a '/'
1419 #ifndef _WINDOWS
1420     source -= 1;
1421 #endif
1422   } else if (strncmp(source, "jrt:/", 5) == 0) {
1423     source += 5;
1424   }
1425   return source;
1426 }
1427 
1428 // Record the shared classpath index and loader type for classes loaded
1429 // by the builtin loaders at dump time.
1430 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1431   assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "sanity");
1432   assert(stream != NULL, "sanity");
1433 
1434   if (ik->is_unsafe_anonymous()) {
1435     // We do not archive unsafe anonymous classes.
1436     return;
1437   }
1438 
1439   oop loader = ik->class_loader();
1440   char* src = (char*)stream->source();
1441   if (src == NULL) {
1442     if (loader == NULL) {
1443       // JFR classes
1444       ik->set_shared_classpath_index(0);
1445       ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1446     }
1447     return;
1448   }
1449 
1450   assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1451 
1452   ResourceMark rm(THREAD);
1453   int classpath_index = -1;
1454   PackageEntry* pkg_entry = ik->package();
1455 
1456   if (FileMapInfo::get_number_of_shared_paths() > 0) {
1457     char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1458 
1459     // save the path from the file: protocol or the module name from the jrt: protocol
1460     // if no protocol prefix is found, path is the same as stream->source()
1461     char* path = skip_uri_protocol(src);
1462     char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1463     bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1464     // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1465     // such as ClassLoader::load_class(), its source path must be valid.
1466     assert(success, "must be valid path");
1467     for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1468       SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1469       success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1470       // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1471       // it must be valid here.
1472       assert(success, "must be valid path");
1473       // If the path (from the class stream source) is the same as the shared
1474       // class or module path, then we have a match.
1475       if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1476         // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1477         // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1478         // and jvmti appended entries.
1479         if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1480           // Ensure the index is within the -cp range before assigning
1481           // to the classpath_index.
1482           if (SystemDictionary::is_system_class_loader(loader) &&
1483               (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1484               (i < ClassLoaderExt::app_module_paths_start_index())) {
1485             classpath_index = i;
1486             break;
1487           } else {
1488             if ((i >= 1) &&
1489                 (i < ClassLoaderExt::app_class_paths_start_index())) {
1490               // The class must be from boot loader append path which consists of
1491               // -Xbootclasspath/a and jvmti appended entries.
1492               assert(loader == NULL, "sanity");
1493               classpath_index = i;
1494               break;
1495             }
1496           }
1497         } else {
1498           // A class from a named module from the --module-path. Ensure the index is
1499           // within the --module-path range before assigning to the classpath_index.
1500           if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1501             if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1502                 i < FileMapInfo::get_number_of_shared_paths()) {
1503               classpath_index = i;
1504               break;
1505             }
1506           }
1507         }
1508       }
1509       // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1510       // The class must be from the runtime modules image.
1511       if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1512         classpath_index = i;
1513         break;
1514       }
1515     }
1516 
1517     // No path entry found for this class. Must be a shared class loaded by the
1518     // user defined classloader.
1519     if (classpath_index < 0) {
1520       assert(ik->shared_classpath_index() < 0, "Sanity");
1521       ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1522       SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1523       return;
1524     }
1525   } else {
1526     // The shared path table is set up after module system initialization.
1527     // The path table contains no entry before that. Any classes loaded prior
1528     // to the setup of the shared path table must be from the modules image.
1529     assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1530     assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1531     classpath_index = 0;
1532   }
1533 
1534   const char* const class_name = ik->name()->as_C_string();
1535   const char* const file_name = file_name_for_class_name(class_name,
1536                                                          ik->name()->utf8_length());
1537   assert(file_name != NULL, "invariant");
1538 
1539   ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1540 }
1541 #endif // INCLUDE_CDS
1542 
1543 // Initialize the class loader's access to methods in libzip.  Parse and
1544 // process the boot classpath into a list ClassPathEntry objects.  Once
1545 // this list has been created, it must not change order (see class PackageInfo)
1546 // it can be appended to and is by jvmti and the kernel vm.
1547 
1548 void ClassLoader::initialize() {
1549   EXCEPTION_MARK;
1550 
1551   if (UsePerfData) {
1552     // jvmstat performance counters
1553     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1554     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1555     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1556     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1557     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1558     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1559     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1560     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1561     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1562     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1563 
1564     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1565     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1566     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1567     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1568     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1569     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1570     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1571     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1572     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1573     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1574     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1575     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1576     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1577 
1578 
1579     // The following performance counters are added for measuring the impact
1580     // of the bug fix of 6365597. They are mainly focused on finding out
1581     // the behavior of system & user-defined classloader lock, whether
1582     // ClassLoader.loadClass/findClass is being called synchronized or not.
1583     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1584                         "systemLoaderLockContentionRate");
1585     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1586                         "nonSystemLoaderLockContentionRate");
1587     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1588                         "jvmFindLoadedClassNoLockCalls");
1589     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1590                         "jvmDefineClassNoLockCalls");
1591 
1592     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1593                         "jniDefineClassNoLockCalls");
1594 
1595     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1596                         "unsafeDefineClassCalls");
1597   }
1598 
1599   // lookup zip library entry points
1600   load_zip_library();
1601   // lookup jimage library entry points
1602   load_jimage_library();
1603 #if INCLUDE_CDS
1604   // initialize search path
1605   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1606     _shared_paths_misc_info = new SharedPathsMiscInfo();
1607   }
1608 #endif
1609   setup_bootstrap_search_path();
1610 }
1611 
1612 #if INCLUDE_CDS
1613 void ClassLoader::initialize_shared_path() {
1614   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1615     ClassLoaderExt::setup_search_paths();
1616     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1617   }
1618 }
1619 
1620 void ClassLoader::initialize_module_path(TRAPS) {
1621   if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1622     ClassLoaderExt::setup_module_paths(THREAD);
1623     FileMapInfo::allocate_shared_path_table();
1624   }
1625 }
1626 #endif
1627 
1628 jlong ClassLoader::classloader_time_ms() {
1629   return UsePerfData ?
1630     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1631 }
1632 
1633 jlong ClassLoader::class_init_count() {
1634   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1635 }
1636 
1637 jlong ClassLoader::class_init_time_ms() {
1638   return UsePerfData ?
1639     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1640 }
1641 
1642 jlong ClassLoader::class_verify_time_ms() {
1643   return UsePerfData ?
1644     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1645 }
1646 
1647 jlong ClassLoader::class_link_count() {
1648   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1649 }
1650 
1651 jlong ClassLoader::class_link_time_ms() {
1652   return UsePerfData ?
1653     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1654 }
1655 
1656 int ClassLoader::compute_Object_vtable() {
1657   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1658   // code to determine actual value from file
1659   // Would be value '11' if finals were in vtable
1660   int JDK_1_2_Object_vtable_size = 5;
1661   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1662 }
1663 
1664 
1665 void classLoader_init1() {
1666   ClassLoader::initialize();
1667 }
1668 
1669 // Complete the ClassPathEntry setup for the boot loader
1670 void ClassLoader::classLoader_init2(TRAPS) {
1671   // Setup the list of module/path pairs for --patch-module processing
1672   // This must be done after the SymbolTable is created in order
1673   // to use fast_compare on module names instead of a string compare.
1674   if (Arguments::get_patch_mod_prefix() != NULL) {
1675     setup_patch_mod_entries();
1676   }
1677 
1678   // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1679   // to successfully determine if java.base has been patched)
1680   create_javabase();
1681 
1682   // Setup the initial java.base/path pair for the exploded build entries.
1683   // As more modules are defined during module system initialization, more
1684   // entries will be added to the exploded build array.
1685   if (!has_jrt_entry()) {
1686     assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1687     assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1688     assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1689     // Set up the boot loader's _exploded_entries list.  Note that this gets
1690     // done before loading any classes, by the same thread that will
1691     // subsequently do the first class load. So, no lock is needed for this.
1692     assert(_exploded_entries == NULL, "Should only get initialized once");
1693     _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1694       GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1695     add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1696   }
1697 }
1698 
1699 
1700 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1701   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1702   if (CanonicalizeEntry != NULL) {
1703     JavaThread* THREAD = JavaThread::current();
1704     JNIEnv* env = THREAD->jni_environment();
1705     ResourceMark rm(THREAD);
1706 
1707     // os::native_path writes into orig_copy
1708     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1709     strcpy(orig_copy, orig);
1710     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1711       return false;
1712     }
1713   } else {
1714     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1715     strncpy(out, orig, len);
1716     out[len - 1] = '\0';
1717   }
1718   return true;
1719 }
1720 
1721 void ClassLoader::create_javabase() {
1722   Thread* THREAD = Thread::current();
1723 
1724   // Create java.base's module entry for the boot
1725   // class loader prior to loading j.l.Ojbect.
1726   ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1727 
1728   // Get module entry table
1729   ModuleEntryTable* null_cld_modules = null_cld->modules();
1730   if (null_cld_modules == NULL) {
1731     vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1732   }
1733 
1734   {
1735     MutexLocker ml(Module_lock, THREAD);
1736     ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1737                                false, vmSymbols::java_base(), NULL, NULL, null_cld);
1738     if (jb_module == NULL) {
1739       vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1740     }
1741     ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1742   }
1743 }
1744 
1745 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1746 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1747 void PerfClassTraceTime::initialize() {
1748   if (!UsePerfData) return;
1749 
1750   if (_eventp != NULL) {
1751     // increment the event counter
1752     _eventp->inc();
1753   }
1754 
1755   // stop the current active thread-local timer to measure inclusive time
1756   _prev_active_event = -1;
1757   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1758      if (_timers[i].is_active()) {
1759        assert(_prev_active_event == -1, "should have only one active timer");
1760        _prev_active_event = i;
1761        _timers[i].stop();
1762      }
1763   }
1764 
1765   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1766     // start the inclusive timer if not recursively called
1767     _t.start();
1768   }
1769 
1770   // start thread-local timer of the given event type
1771    if (!_timers[_event_type].is_active()) {
1772     _timers[_event_type].start();
1773   }
1774 }
1775 
1776 PerfClassTraceTime::~PerfClassTraceTime() {
1777   if (!UsePerfData) return;
1778 
1779   // stop the thread-local timer as the event completes
1780   // and resume the thread-local timer of the event next on the stack
1781   _timers[_event_type].stop();
1782   jlong selftime = _timers[_event_type].ticks();
1783 
1784   if (_prev_active_event >= 0) {
1785     _timers[_prev_active_event].start();
1786   }
1787 
1788   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1789 
1790   // increment the counters only on the leaf call
1791   _t.stop();
1792   _timep->inc(_t.ticks());
1793   if (_selftimep != NULL) {
1794     _selftimep->inc(selftime);
1795   }
1796   // add all class loading related event selftime to the accumulated time counter
1797   ClassLoader::perf_accumulated_time()->inc(selftime);
1798 
1799   // reset the timer
1800   _timers[_event_type].reset();
1801 }