1 /*
   2  * Copyright (c) 1997, 2017, 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.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/systemDictionary.hpp"
  38 #include "classfile/vmSymbols.hpp"
  39 #include "compiler/compileBroker.hpp"
  40 #include "gc/shared/collectedHeap.inline.hpp"
  41 #include "gc/shared/generation.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.inline.hpp"
  52 #include "oops/instanceKlass.hpp"
  53 #include "oops/instanceRefKlass.hpp"
  54 #include "oops/objArrayOop.inline.hpp"
  55 #include "oops/oop.inline.hpp"
  56 #include "oops/symbol.hpp"
  57 #include "prims/jvm_misc.hpp"
  58 #include "runtime/arguments.hpp"
  59 #include "runtime/compilationPolicy.hpp"
  60 #include "runtime/handles.hpp"
  61 #include "runtime/handles.inline.hpp"
  62 #include "runtime/init.hpp"
  63 #include "runtime/interfaceSupport.hpp"
  64 #include "runtime/java.hpp"
  65 #include "runtime/javaCalls.hpp"
  66 #include "runtime/os.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/sharedClassUtil.hpp"
  77 #include "classfile/sharedPathsMiscInfo.hpp"
  78 #endif
  79 
  80 // Entry points in zip.dll for loading zip/jar file entries
  81 
  82 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  83 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  84 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  85 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  86 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  87 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  88 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  89 
  90 static ZipOpen_t         ZipOpen            = NULL;
  91 static ZipClose_t        ZipClose           = NULL;
  92 static FindEntry_t       FindEntry          = NULL;
  93 static ReadEntry_t       ReadEntry          = 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 static JImage_ResourcePath_t           JImageResourcePath     = NULL;
 108 
 109 // Globals
 110 
 111 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 112 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 113 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 114 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 115 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 116 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 117 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 118 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 119 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 120 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 121 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 122 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 123 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 124 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 125 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 126 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 127 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 128 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 129 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 130 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 131 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 132 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 133 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 134 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 135 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 136 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 137 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 138 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 139 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 140 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 141 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 142 
 143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
 144 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
 145 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
 146 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
 147 ClassPathEntry* ClassLoader::_last_append_entry  = NULL;
 148 #if INCLUDE_CDS
 149 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
 150 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
 151 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
 152 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
 153 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 154 #endif
 155 
 156 // helper routines
 157 bool string_starts_with(const char* str, const char* str_to_find) {
 158   size_t str_len = strlen(str);
 159   size_t str_to_find_len = strlen(str_to_find);
 160   if (str_to_find_len > str_len) {
 161     return false;
 162   }
 163   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 164 }
 165 
 166 static const char* get_jimage_version_string() {
 167   static char version_string[10] = "";
 168   if (version_string[0] == '\0') {
 169     jio_snprintf(version_string, sizeof(version_string), "%d.%d",
 170                  Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
 171   }
 172   return (const char*)version_string;
 173 }
 174 
 175 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
 176   size_t str_len = strlen(str);
 177   size_t str_to_find_len = strlen(str_to_find);
 178   if (str_to_find_len > str_len) {
 179     return false;
 180   }
 181   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 182 }
 183 
 184 // Used to obtain the package name from a fully qualified class name.
 185 // It is the responsibility of the caller to establish a ResourceMark.
 186 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
 187   if (class_name == NULL) {
 188     if (bad_class_name != NULL) {
 189       *bad_class_name = true;
 190     }
 191     return NULL;
 192   }
 193 
 194   if (bad_class_name != NULL) {
 195     *bad_class_name = false;
 196   }
 197 
 198   const char* const last_slash = strrchr(class_name, '/');
 199   if (last_slash == NULL) {
 200     // No package name
 201     return NULL;
 202   }
 203 
 204   char* class_name_ptr = (char*) class_name;
 205   // Skip over '['s
 206   if (*class_name_ptr == '[') {
 207     do {
 208       class_name_ptr++;
 209     } while (*class_name_ptr == '[');
 210 
 211     // Fully qualified class names should not contain a 'L'.
 212     // Set bad_class_name to true to indicate that the package name
 213     // could not be obtained due to an error condition.
 214     // In this situation, is_same_class_package returns false.
 215     if (*class_name_ptr == 'L') {
 216       if (bad_class_name != NULL) {
 217         *bad_class_name = true;
 218       }
 219       return NULL;
 220     }
 221   }
 222 
 223   int length = last_slash - class_name_ptr;
 224 
 225   // A class name could have just the slash character in the name.
 226   if (length <= 0) {
 227     // No package name
 228     if (bad_class_name != NULL) {
 229       *bad_class_name = true;
 230     }
 231     return NULL;
 232   }
 233 
 234   // drop name after last slash (including slash)
 235   // Ex., "java/lang/String.class" => "java/lang"
 236   char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
 237   strncpy(pkg_name, class_name_ptr, length);
 238   *(pkg_name+length) = '\0';
 239 
 240   return (const char *)pkg_name;
 241 }
 242 
 243 // Given a fully qualified class name, find its defining package in the class loader's
 244 // package entry table.
 245 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
 246   ResourceMark rm(THREAD);
 247   const char *pkg_name = ClassLoader::package_from_name(class_name);
 248   if (pkg_name == NULL) {
 249     return NULL;
 250   }
 251   PackageEntryTable* pkgEntryTable = loader_data->packages();
 252   TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
 253   return pkgEntryTable->lookup_only(pkg_symbol);
 254 }
 255 
 256 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 257   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 258   strcpy(copy, dir);
 259   _dir = copy;
 260 }
 261 
 262 
 263 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 264   // construct full path name
 265   assert((_dir != NULL) && (name != NULL), "sanity");
 266   size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
 267   char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
 268   int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
 269   assert(len == (int)(path_len - 1), "sanity");
 270   // check if file exists
 271   struct stat st;
 272   if (os::stat(path, &st) == 0) {
 273 #if INCLUDE_CDS
 274     if (DumpSharedSpaces) {
 275       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 276       // we should never find a file underneath it -- unless user has added a new file while we are running
 277       // the dump, in which case let's quit!
 278       ShouldNotReachHere();
 279     }
 280 #endif
 281     // found file, open it
 282     int file_handle = os::open(path, 0, 0);
 283     if (file_handle != -1) {
 284       // read contents into resource array
 285       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 286       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 287       // close file
 288       os::close(file_handle);
 289       // construct ClassFileStream
 290       if (num_read == (size_t)st.st_size) {
 291         if (UsePerfData) {
 292           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 293         }
 294         FREE_RESOURCE_ARRAY(char, path, path_len);
 295         // Resource allocated
 296         return new ClassFileStream(buffer,
 297                                    st.st_size,
 298                                    _dir,
 299                                    ClassFileStream::verify);
 300       }
 301     }
 302   }
 303   FREE_RESOURCE_ARRAY(char, path, path_len);
 304   return NULL;
 305 }
 306 
 307 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
 308   _zip = zip;
 309   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 310   strcpy(copy, zip_name);
 311   _zip_name = copy;
 312   _is_boot_append = is_boot_append;
 313   _multi_versioned = _unknown;
 314 }
 315 
 316 ClassPathZipEntry::~ClassPathZipEntry() {
 317   if (ZipClose != NULL) {
 318     (*ZipClose)(_zip);
 319   }
 320   FREE_C_HEAP_ARRAY(char, _zip_name);
 321 }
 322 
 323 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 324     // enable call to C land
 325   JavaThread* thread = JavaThread::current();
 326   ThreadToNativeFromVM ttn(thread);
 327   // check whether zip archive contains name
 328   jint name_len;
 329   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 330   if (entry == NULL) return NULL;
 331   u1* buffer;
 332   char name_buf[128];
 333   char* filename;
 334   if (name_len < 128) {
 335     filename = name_buf;
 336   } else {
 337     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 338   }
 339 
 340   // read contents into resource array
 341   int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 342   buffer = NEW_RESOURCE_ARRAY(u1, size);
 343   if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 344 
 345   // return result
 346   if (nul_terminate) {
 347     buffer[*filesize] = 0;
 348   }
 349   return buffer;
 350 }
 351 
 352 #if INCLUDE_CDS
 353 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
 354   u1* buffer = NULL;
 355   if (DumpSharedSpaces && !_is_boot_append) {
 356     // We presume default is multi-release enabled
 357     const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
 358     const char* verstr = Arguments::get_property("jdk.util.jar.version");
 359     bool is_multi_ver = (multi_ver == NULL ||
 360                          strcmp(multi_ver, "true") == 0 ||
 361                          strcmp(multi_ver, "force")  == 0) &&
 362                          is_multiple_versioned(THREAD);
 363     // command line version setting
 364     int version = 0;
 365     const int base_version = 8; // JDK8
 366     int cur_ver = JDK_Version::current().major_version();
 367     if (verstr != NULL) {
 368       version = atoi(verstr);
 369       if (version < base_version || version > cur_ver) {
 370         // If the specified version is lower than the base version, the base
 371         // entry will be used; if the version is higher than the current
 372         // jdk version, the highest versioned entry will be used.
 373         if (version < base_version) {
 374           is_multi_ver = false;
 375         }
 376         // print out warning, do not use assertion here since it will continue to look
 377         // for proper version.
 378         warning("JDK%d is not supported in multiple version jars", version);
 379       }
 380     }
 381 
 382     if (is_multi_ver) {
 383       int n;
 384       const char* version_entry = "META-INF/versions/";
 385       // 10 is the max length of a decimal 32-bit non-negative number
 386       // 2 includes the '/' and trailing zero
 387       size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
 388       char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
 389       if (version > 0) {
 390         n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
 391         entry_name[n] = '\0';
 392         buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 393         if (buffer == NULL) {
 394           warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
 395         }
 396       }
 397       if (buffer == NULL) {
 398         for (int i = cur_ver; i >= base_version; i--) {
 399           n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
 400           entry_name[n] = '\0';
 401           buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 402           if (buffer != NULL) {
 403             break;
 404           }
 405         }
 406       }
 407       FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
 408     }
 409   }
 410   return buffer;
 411 }
 412 
 413 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
 414   assert(DumpSharedSpaces, "called only at dump time");
 415   if (_multi_versioned != _unknown) {
 416     return (_multi_versioned == _yes) ? true : false;
 417   }
 418   jint size;
 419   char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
 420   if (buffer != NULL) {
 421     char* p = buffer;
 422     for ( ; *p; ++p) *p = tolower(*p);
 423     if (strstr(buffer, "multi-release: true") != NULL) {
 424       _multi_versioned = _yes;
 425       return true;
 426     }
 427   }
 428   _multi_versioned = _no;
 429   return false;
 430 }
 431 #endif // INCLUDE_CDS
 432 
 433 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 434   jint filesize;
 435   u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
 436   if (buffer == NULL) {
 437     buffer = open_entry(name, &filesize, false, CHECK_NULL);
 438     if (buffer == NULL) {
 439       return NULL;
 440     }
 441   }
 442   if (UsePerfData) {
 443     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 444   }
 445   // Resource allocated
 446   return new ClassFileStream(buffer,
 447                              filesize,
 448                              _zip_name,
 449                              ClassFileStream::verify);
 450 }
 451 
 452 // invoke function for each entry in the zip file
 453 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 454   JavaThread* thread = JavaThread::current();
 455   HandleMark  handle_mark(thread);
 456   ThreadToNativeFromVM ttn(thread);
 457   for (int n = 0; ; n++) {
 458     jzentry * ze = ((*GetNextEntry)(_zip, n));
 459     if (ze == NULL) break;
 460     (*f)(ze->name, context);
 461   }
 462 }
 463 
 464 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
 465   ClassPathEntry(),
 466   _jimage(jimage) {
 467   guarantee(jimage != NULL, "jimage file is null");
 468   guarantee(name != NULL, "jimage file name is null");
 469   size_t len = strlen(name) + 1;
 470   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 471   strncpy((char *)_name, name, len);
 472 }
 473 
 474 ClassPathImageEntry::~ClassPathImageEntry() {
 475   if (_name != NULL) {
 476     FREE_C_HEAP_ARRAY(const char, _name);
 477     _name = NULL;
 478   }
 479   if (_jimage != NULL) {
 480     (*JImageClose)(_jimage);
 481     _jimage = NULL;
 482   }
 483 }
 484 
 485 // For a class in a named module, look it up in the jimage file using this syntax:
 486 //    /<module-name>/<package-name>/<base-class>
 487 //
 488 // Assumptions:
 489 //     1. There are no unnamed modules in the jimage file.
 490 //     2. A package is in at most one module in the jimage file.
 491 //
 492 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 493   jlong size;
 494   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 495 
 496   if (location == 0) {
 497     ResourceMark rm;
 498     const char* pkg_name = ClassLoader::package_from_name(name);
 499 
 500     if (pkg_name != NULL) {
 501       if (!Universe::is_module_initialized()) {
 502         location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
 503 #if INCLUDE_CDS
 504         // CDS uses the boot class loader to load classes whose packages are in
 505         // modules defined for other class loaders.  So, for now, get their module
 506         // names from the "modules" jimage file.
 507         if (DumpSharedSpaces && location == 0) {
 508           const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
 509           if (module_name != NULL) {
 510             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 511           }
 512         }
 513 #endif
 514 
 515       } else {
 516         PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
 517         if (package_entry != NULL) {
 518           ResourceMark rm;
 519           // Get the module name
 520           ModuleEntry* module = package_entry->module();
 521           assert(module != NULL, "Boot classLoader package missing module");
 522           assert(module->is_named(), "Boot classLoader package is in unnamed module");
 523           const char* module_name = module->name()->as_C_string();
 524           if (module_name != NULL) {
 525             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 526           }
 527         }
 528       }
 529     }
 530   }
 531   if (location != 0) {
 532     if (UsePerfData) {
 533       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 534     }
 535     char* data = NEW_RESOURCE_ARRAY(char, size);
 536     (*JImageGetResource)(_jimage, location, data, size);
 537     // Resource allocated
 538     return new ClassFileStream((u1*)data,
 539                                (int)size,
 540                                _name,
 541                                ClassFileStream::verify);
 542   }
 543 
 544   return NULL;
 545 }
 546 
 547 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
 548                                                     const char* module_name,
 549                                                     const char* file_name,
 550                                                     jlong &size) {
 551   return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
 552 }
 553 
 554 #ifndef PRODUCT
 555 bool ctw_visitor(JImageFile* jimage,
 556         const char* module_name, const char* version, const char* package,
 557         const char* name, const char* extension, void* arg) {
 558   if (strcmp(extension, "class") == 0) {
 559     Thread* THREAD = Thread::current();
 560     ResourceMark rm(THREAD);
 561     char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
 562     jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
 563     ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
 564     return !HAS_PENDING_EXCEPTION;
 565   }
 566   return true;
 567 }
 568 
 569 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 570   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 571   tty->cr();
 572   (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
 573   if (HAS_PENDING_EXCEPTION) {
 574     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 575       CLEAR_PENDING_EXCEPTION;
 576       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 577       tty->print_cr("Increase class metadata storage if a limit was set");
 578     } else {
 579       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 580     }
 581   }
 582 }
 583 #endif
 584 
 585 bool ClassPathImageEntry::is_modules_image() const {
 586   return ClassLoader::is_modules_image(name());
 587 }
 588 
 589 #if INCLUDE_CDS
 590 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 591   assert(DumpSharedSpaces, "only called at dump time");
 592   tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
 593   vm_exit_during_initialization(error, message);
 594 }
 595 #endif
 596 
 597 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
 598   _module_name = module_name;
 599   _module_first_entry = NULL;
 600   _module_last_entry = NULL;
 601 }
 602 
 603 ModuleClassPathList::~ModuleClassPathList() {
 604   // Clean out each ClassPathEntry on list
 605   ClassPathEntry* e = _module_first_entry;
 606   while (e != NULL) {
 607     ClassPathEntry* next_entry = e->next();
 608     delete e;
 609     e = next_entry;
 610   }
 611 }
 612 
 613 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
 614   if (new_entry != NULL) {
 615     if (_module_last_entry == NULL) {
 616       _module_first_entry = _module_last_entry = new_entry;
 617     } else {
 618       _module_last_entry->set_next(new_entry);
 619       _module_last_entry = new_entry;
 620     }
 621   }
 622 }
 623 
 624 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 625   LogTarget(Info, class, path) lt;
 626   if (lt.is_enabled()) {
 627     LogStream ls(lt);
 628     if (msg) {
 629       ls.print("%s", msg);
 630     }
 631     if (name) {
 632       if (strlen(name) < 256) {
 633         ls.print("%s", name);
 634       } else {
 635         // For very long paths, we need to print each character separately,
 636         // as print_cr() has a length limit
 637         while (name[0] != '\0') {
 638           ls.print("%c", name[0]);
 639           name++;
 640         }
 641       }
 642     }
 643     ls.cr();
 644   }
 645 }
 646 
 647 #if INCLUDE_CDS
 648 void ClassLoader::check_shared_classpath(const char *path) {
 649   if (strcmp(path, "") == 0) {
 650     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 651   }
 652 
 653   struct stat st;
 654   if (os::stat(path, &st) == 0) {
 655     if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
 656       if (!os::dir_is_empty(path)) {
 657         tty->print_cr("Error: non-empty directory '%s'", path);
 658         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 659       }
 660     }
 661   }
 662 }
 663 #endif
 664 
 665 void ClassLoader::setup_bootstrap_search_path() {
 666   const char* sys_class_path = Arguments::get_sysclasspath();
 667   if (PrintSharedArchiveAndExit) {
 668     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 669     // the same as the bootcp of the shared archive.
 670   } else {
 671     trace_class_path("bootstrap loader class path=", sys_class_path);
 672   }
 673 #if INCLUDE_CDS
 674   if (DumpSharedSpaces) {
 675     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 676   }
 677 #endif
 678   setup_boot_search_path(sys_class_path);
 679 }
 680 
 681 #if INCLUDE_CDS
 682 int ClassLoader::get_shared_paths_misc_info_size() {
 683   return _shared_paths_misc_info->get_used_bytes();
 684 }
 685 
 686 void* ClassLoader::get_shared_paths_misc_info() {
 687   return _shared_paths_misc_info->buffer();
 688 }
 689 
 690 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 691   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 692   bool result = checker->check();
 693   delete checker;
 694   return result;
 695 }
 696 
 697 void ClassLoader::setup_app_search_path(const char *class_path) {
 698 
 699   assert(DumpSharedSpaces, "Sanity");
 700 
 701   Thread* THREAD = Thread::current();
 702   int len = (int)strlen(class_path);
 703   int end = 0;
 704 
 705   // Iterate over class path entries
 706   for (int start = 0; start < len; start = end) {
 707     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 708       end++;
 709     }
 710     EXCEPTION_MARK;
 711     ResourceMark rm(THREAD);
 712     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 713     strncpy(path, &class_path[start], end - start);
 714     path[end - start] = '\0';
 715 
 716     check_shared_classpath(path);
 717 
 718     update_class_path_entry_list(path, false, false);
 719 
 720     while (class_path[end] == os::path_separator()[0]) {
 721       end++;
 722     }
 723   }
 724 }
 725 
 726 #endif
 727 
 728 // Construct the array of module/path pairs as specified to --patch-module
 729 // for the boot loader to search ahead of the jimage, if the class being
 730 // loaded is defined to a module that has been specified to --patch-module.
 731 void ClassLoader::setup_patch_mod_entries() {
 732   Thread* THREAD = Thread::current();
 733   GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
 734   int num_of_entries = patch_mod_args->length();
 735 
 736 
 737   // Set up the boot loader's _patch_mod_entries list
 738   _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
 739 
 740   for (int i = 0; i < num_of_entries; i++) {
 741     const char* module_name = (patch_mod_args->at(i))->module_name();
 742     Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
 743     assert(module_sym != NULL, "Failed to obtain Symbol for module name");
 744     ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
 745 
 746     char* class_path = (patch_mod_args->at(i))->path_string();
 747     int len = (int)strlen(class_path);
 748     int end = 0;
 749     // Iterate over the module's class path entries
 750     for (int start = 0; start < len; start = end) {
 751       while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 752         end++;
 753       }
 754       EXCEPTION_MARK;
 755       ResourceMark rm(THREAD);
 756       char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 757       strncpy(path, &class_path[start], end - start);
 758       path[end - start] = '\0';
 759 
 760       struct stat st;
 761       if (os::stat(path, &st) == 0) {
 762         // File or directory found
 763         Thread* THREAD = Thread::current();
 764         ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 765         // If the path specification is valid, enter it into this module's list
 766         if (new_entry != NULL) {
 767           module_cpl->add_to_list(new_entry);
 768         }
 769       }
 770 
 771       while (class_path[end] == os::path_separator()[0]) {
 772         end++;
 773       }
 774     }
 775 
 776     // Record the module into the list of --patch-module entries only if
 777     // valid ClassPathEntrys have been created
 778     if (module_cpl->module_first_entry() != NULL) {
 779       _patch_mod_entries->push(module_cpl);
 780     }
 781   }
 782 }
 783 
 784 // Determine whether the module has been patched via the command-line
 785 // option --patch-module
 786 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
 787   if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
 788     int table_len = _patch_mod_entries->length();
 789     for (int i = 0; i < table_len; i++) {
 790       ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
 791       if (module_name->fast_compare(patch_mod->module_name()) == 0) {
 792         return true;
 793       }
 794     }
 795   }
 796   return false;
 797 }
 798 
 799 // Set up the _jrt_entry if present and boot append path
 800 void ClassLoader::setup_boot_search_path(const char *class_path) {
 801   int len = (int)strlen(class_path);
 802   int end = 0;
 803   bool set_base_piece = true;
 804 
 805 #if INCLUDE_CDS
 806   if (DumpSharedSpaces) {
 807     if (!Arguments::has_jimage()) {
 808       vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
 809     }
 810   }
 811 #endif
 812 
 813   // Iterate over class path entries
 814   for (int start = 0; start < len; start = end) {
 815     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 816       end++;
 817     }
 818     EXCEPTION_MARK;
 819     ResourceMark rm(THREAD);
 820     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 821     strncpy(path, &class_path[start], end - start);
 822     path[end - start] = '\0';
 823 
 824     if (set_base_piece) {
 825       // The first time through the bootstrap_search setup, it must be determined
 826       // what the base or core piece of the boot loader search is.  Either a java runtime
 827       // image is present or this is an exploded module build situation.
 828       assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
 829              "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
 830       struct stat st;
 831       if (os::stat(path, &st) == 0) {
 832         // Directory found
 833         Thread* THREAD = Thread::current();
 834         ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 835 
 836         // Check for a jimage
 837         if (Arguments::has_jimage()) {
 838           assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
 839           assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
 840           _jrt_entry = new_entry;
 841           assert(_jrt_entry->jimage() != NULL, "No java runtime image");
 842         }
 843       } else {
 844         // If path does not exist, exit
 845         vm_exit_during_initialization("Unable to establish the boot loader search path", path);
 846       }
 847       set_base_piece = false;
 848     } else {
 849       // Every entry on the system boot class path after the initial base piece,
 850       // which is set by os::set_boot_path(), is considered an appended entry.
 851       update_class_path_entry_list(path, false, true);
 852     }
 853 
 854 #if INCLUDE_CDS
 855     if (DumpSharedSpaces) {
 856       check_shared_classpath(path);
 857     }
 858 #endif
 859     while (class_path[end] == os::path_separator()[0]) {
 860       end++;
 861     }
 862   }
 863 }
 864 
 865 // During an exploded modules build, each module defined to the boot loader
 866 // will be added to the ClassLoader::_exploded_entries array.
 867 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
 868   assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
 869   assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
 870 
 871   // Find the module's symbol
 872   ResourceMark rm(THREAD);
 873   const char *module_name = module_sym->as_C_string();
 874   const char *home = Arguments::get_java_home();
 875   const char file_sep = os::file_separator()[0];
 876   // 10 represents the length of "modules" + 2 file separators + \0
 877   size_t len = strlen(home) + strlen(module_name) + 10;
 878   char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
 879   jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
 880 
 881   struct stat st;
 882   if (os::stat(path, &st) == 0) {
 883     // Directory found
 884     ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
 885 
 886     // If the path specification is valid, enter it into this module's list.
 887     // There is no need to check for duplicate modules in the exploded entry list,
 888     // since no two modules with the same name can be defined to the boot loader.
 889     // This is checked at module definition time in Modules::define_module.
 890     if (new_entry != NULL) {
 891       ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
 892       module_cpl->add_to_list(new_entry);
 893       {
 894         MutexLocker ml(Module_lock, THREAD);
 895         _exploded_entries->push(module_cpl);
 896       }
 897       log_info(class, load)("path: %s", path);
 898     }
 899   }
 900   FREE_C_HEAP_ARRAY(char, path);
 901 }
 902 
 903 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 904                                                      bool throw_exception,
 905                                                      bool is_boot_append, TRAPS) {
 906   JavaThread* thread = JavaThread::current();
 907   ClassPathEntry* new_entry = NULL;
 908   if ((st->st_mode & S_IFMT) == S_IFREG) {
 909     ResourceMark rm(thread);
 910     // Regular file, should be a zip or jimage file
 911     // Canonicalized filename
 912     char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
 913     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 914       // This matches the classic VM
 915       if (throw_exception) {
 916         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 917       } else {
 918         return NULL;
 919       }
 920     }
 921     jint error;
 922     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 923     if (jimage != NULL) {
 924       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 925     } else {
 926       char* error_msg = NULL;
 927       jzfile* zip;
 928       {
 929         // enable call to C land
 930         ThreadToNativeFromVM ttn(thread);
 931         HandleMark hm(thread);
 932         zip = (*ZipOpen)(canonical_path, &error_msg);
 933       }
 934       if (zip != NULL && error_msg == NULL) {
 935         new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
 936       } else {
 937         char *msg;
 938         if (error_msg == NULL) {
 939           msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
 940           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 941         } else {
 942           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 943           msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
 944           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 945         }
 946         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 947         if (throw_exception && is_init_completed()) {
 948           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 949         } else {
 950           return NULL;
 951         }
 952       }
 953     }
 954     log_info(class, path)("opened: %s", path);
 955     log_info(class, load)("opened: %s", path);
 956   } else {
 957     // Directory
 958     new_entry = new ClassPathDirEntry(path);
 959     log_info(class, load)("path: %s", path);
 960   }
 961   return new_entry;
 962 }
 963 
 964 
 965 // Create a class path zip entry for a given path (return NULL if not found
 966 // or zip/JAR file cannot be opened)
 967 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
 968   // check for a regular file
 969   struct stat st;
 970   if (os::stat(path, &st) == 0) {
 971     if ((st.st_mode & S_IFMT) == S_IFREG) {
 972       char canonical_path[JVM_MAXPATHLEN];
 973       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 974         char* error_msg = NULL;
 975         jzfile* zip;
 976         {
 977           // enable call to C land
 978           JavaThread* thread = JavaThread::current();
 979           ThreadToNativeFromVM ttn(thread);
 980           HandleMark hm(thread);
 981           zip = (*ZipOpen)(canonical_path, &error_msg);
 982         }
 983         if (zip != NULL && error_msg == NULL) {
 984           // create using canonical path
 985           return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
 986         }
 987       }
 988     }
 989   }
 990   return NULL;
 991 }
 992 
 993 // returns true if entry already on class path
 994 bool ClassLoader::contains_append_entry(const char* name) {
 995   ClassPathEntry* e = _first_append_entry;
 996   while (e != NULL) {
 997     // assume zip entries have been canonicalized
 998     if (strcmp(name, e->name()) == 0) {
 999       return true;
1000     }
1001     e = e->next();
1002   }
1003   return false;
1004 }
1005 
1006 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
1007   if (new_entry != NULL) {
1008     if (_last_append_entry == NULL) {
1009       assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
1010       _first_append_entry = _last_append_entry = new_entry;
1011     } else {
1012       _last_append_entry->set_next(new_entry);
1013       _last_append_entry = new_entry;
1014     }
1015   }
1016 }
1017 
1018 // Record the path entries specified in -cp during dump time. The recorded
1019 // information will be used at runtime for loading the archived app classes.
1020 //
1021 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
1022 // loading app classes. Instead, the app class are loaded by the
1023 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
1024 void ClassLoader::add_to_app_classpath_entries(const char* path,
1025                                                ClassPathEntry* entry,
1026                                                bool check_for_duplicates) {
1027 #if INCLUDE_CDS
1028   assert(entry != NULL, "ClassPathEntry should not be NULL");
1029   ClassPathEntry* e = _app_classpath_entries;
1030   if (check_for_duplicates) {
1031     while (e != NULL) {
1032       if (strcmp(e->name(), entry->name()) == 0) {
1033         // entry already exists
1034         return;
1035       }
1036       e = e->next();
1037     }
1038   }
1039 
1040   // The entry does not exist, add to the list
1041   if (_app_classpath_entries == NULL) {
1042     assert(_last_app_classpath_entry == NULL, "Sanity");
1043     _app_classpath_entries = _last_app_classpath_entry = entry;
1044   } else {
1045     _last_app_classpath_entry->set_next(entry);
1046     _last_app_classpath_entry = entry;
1047   }
1048 
1049   if (entry->is_jar_file()) {
1050     ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
1051   } else {
1052     if (!os::dir_is_empty(path)) {
1053       tty->print_cr("Error: non-empty directory '%s'", path);
1054       exit_with_path_failure("Cannot have non-empty directory in app classpaths", NULL);
1055     }
1056   }
1057 #endif
1058 }
1059 
1060 // Returns true IFF the file/dir exists and the entry was successfully created.
1061 bool ClassLoader::update_class_path_entry_list(const char *path,
1062                                                bool check_for_duplicates,
1063                                                bool is_boot_append,
1064                                                bool throw_exception) {
1065   struct stat st;
1066   if (os::stat(path, &st) == 0) {
1067     // File or directory found
1068     ClassPathEntry* new_entry = NULL;
1069     Thread* THREAD = Thread::current();
1070     new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1071     if (new_entry == NULL) {
1072       return false;
1073     }
1074 
1075     // Do not reorder the bootclasspath which would break get_system_package().
1076     // Add new entry to linked list
1077     if (is_boot_append) {
1078       add_to_boot_append_entries(new_entry);
1079     } else {
1080       add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
1081     }
1082     return true;
1083   } else {
1084 #if INCLUDE_CDS
1085     if (DumpSharedSpaces) {
1086       _shared_paths_misc_info->add_nonexist_path(path);
1087     }
1088 #endif
1089     return false;
1090   }
1091 }
1092 
1093 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1094   ResourceMark rm;
1095   int num_of_entries = module_list->length();
1096   for (int i = 0; i < num_of_entries; i++) {
1097     ClassPathEntry* e;
1098     ModuleClassPathList* mpl = module_list->at(i);
1099     tty->print("%s=", mpl->module_name()->as_C_string());
1100     e = mpl->module_first_entry();
1101     while (e != NULL) {
1102       tty->print("%s", e->name());
1103       e = e->next();
1104       if (e != NULL) {
1105         tty->print("%s", os::path_separator());
1106       }
1107     }
1108     tty->print(" ;");
1109   }
1110 }
1111 
1112 void ClassLoader::print_bootclasspath() {
1113   ClassPathEntry* e;
1114   tty->print("[bootclasspath= ");
1115 
1116   // Print --patch-module module/path specifications first
1117   if (_patch_mod_entries != NULL) {
1118     print_module_entry_table(_patch_mod_entries);
1119   }
1120 
1121   // [jimage | exploded modules build]
1122   if (has_jrt_entry()) {
1123     // Print the location of the java runtime image
1124     tty->print("%s ;", _jrt_entry->name());
1125   } else {
1126     // Print exploded module build path specifications
1127     if (_exploded_entries != NULL) {
1128       print_module_entry_table(_exploded_entries);
1129     }
1130   }
1131 
1132   // appended entries
1133   e = _first_append_entry;
1134   while (e != NULL) {
1135     tty->print("%s ;", e->name());
1136     e = e->next();
1137   }
1138   tty->print_cr("]");
1139 }
1140 
1141 void ClassLoader::load_zip_library() {
1142   assert(ZipOpen == NULL, "should not load zip library twice");
1143   // First make sure native library is loaded
1144   os::native_java_library();
1145   // Load zip library
1146   char path[JVM_MAXPATHLEN];
1147   char ebuf[1024];
1148   void* handle = NULL;
1149   if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1150     handle = os::dll_load(path, ebuf, sizeof ebuf);
1151   }
1152   if (handle == NULL) {
1153     vm_exit_during_initialization("Unable to load ZIP library", path);
1154   }
1155   // Lookup zip entry points
1156   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1157   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1158   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1159   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1160   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1161   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1162   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1163 
1164   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1165   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1166       GetNextEntry == NULL || Crc32 == NULL) {
1167     vm_exit_during_initialization("Corrupted ZIP library", path);
1168   }
1169 
1170   if (ZipInflateFully == NULL) {
1171     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1172   }
1173 
1174   // Lookup canonicalize entry in libjava.dll
1175   void *javalib_handle = os::native_java_library();
1176   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1177   // This lookup only works on 1.3. Do not check for non-null here
1178 }
1179 
1180 void ClassLoader::load_jimage_library() {
1181   // First make sure native library is loaded
1182   os::native_java_library();
1183   // Load jimage library
1184   char path[JVM_MAXPATHLEN];
1185   char ebuf[1024];
1186   void* handle = NULL;
1187   if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1188     handle = os::dll_load(path, ebuf, sizeof ebuf);
1189   }
1190   if (handle == NULL) {
1191     vm_exit_during_initialization("Unable to load jimage library", path);
1192   }
1193 
1194   // Lookup jimage entry points
1195   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1196   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1197   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1198   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1199   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1200   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1201   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1202   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1203   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1204   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1205   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1206   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1207   JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1208   guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1209 }
1210 
1211 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1212   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1213 }
1214 
1215 int ClassLoader::crc32(int crc, const char* buf, int len) {
1216   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1217   return (*Crc32)(crc, (const jbyte*)buf, len);
1218 }
1219 
1220 // Function add_package extracts the package from the fully qualified class name
1221 // and checks if the package is in the boot loader's package entry table.  If so,
1222 // then it sets the classpath_index in the package entry record.
1223 //
1224 // The classpath_index field is used to find the entry on the boot loader class
1225 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1226 // in an unnamed module.  It is also used to indicate (for all packages whose
1227 // classes are loaded by the boot loader) that at least one of the package's
1228 // classes has been loaded.
1229 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1230   assert(fullq_class_name != NULL, "just checking");
1231 
1232   // Get package name from fully qualified class name.
1233   ResourceMark rm;
1234   const char *cp = package_from_name(fullq_class_name);
1235   if (cp != NULL) {
1236     PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1237     TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1238     PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1239     if (pkg_entry != NULL) {
1240       assert(classpath_index != -1, "Unexpected classpath_index");
1241       pkg_entry->set_classpath_index(classpath_index);
1242     } else {
1243       return false;
1244     }
1245   }
1246   return true;
1247 }
1248 
1249 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1250   // Look up the name in the boot loader's package entry table.
1251   if (name != NULL) {
1252     TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1253     // Look for the package entry in the boot loader's package entry table.
1254     PackageEntry* package =
1255       ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1256 
1257     // Return NULL if package does not exist or if no classes in that package
1258     // have been loaded.
1259     if (package != NULL && package->has_loaded_class()) {
1260       ModuleEntry* module = package->module();
1261       if (module->location() != NULL) {
1262         ResourceMark rm(THREAD);
1263         Handle ml = java_lang_String::create_from_str(
1264           module->location()->as_C_string(), THREAD);
1265         return ml();
1266       }
1267       // Return entry on boot loader class path.
1268       Handle cph = java_lang_String::create_from_str(
1269         ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1270       return cph();
1271     }
1272   }
1273   return NULL;
1274 }
1275 
1276 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1277   ResourceMark rm(THREAD);
1278   // List of pointers to PackageEntrys that have loaded classes.
1279   GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1280   {
1281     MutexLocker ml(Module_lock, THREAD);
1282 
1283     PackageEntryTable* pe_table =
1284       ClassLoaderData::the_null_class_loader_data()->packages();
1285 
1286     // Collect the packages that have at least one loaded class.
1287     for (int x = 0; x < pe_table->table_size(); x++) {
1288       for (PackageEntry* package_entry = pe_table->bucket(x);
1289            package_entry != NULL;
1290            package_entry = package_entry->next()) {
1291         if (package_entry->has_loaded_class()) {
1292           loaded_class_pkgs->append(package_entry);
1293         }
1294       }
1295     }
1296   }
1297 
1298 
1299   // Allocate objArray and fill with java.lang.String
1300   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1301                                            loaded_class_pkgs->length(), CHECK_NULL);
1302   objArrayHandle result(THREAD, r);
1303   for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1304     PackageEntry* package_entry = loaded_class_pkgs->at(x);
1305     Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1306     result->obj_at_put(x, str());
1307   }
1308   return result();
1309 }
1310 
1311 // caller needs ResourceMark
1312 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1313                                                   int class_name_len) {
1314   assert(class_name != NULL, "invariant");
1315   assert((int)strlen(class_name) == class_name_len, "invariant");
1316 
1317   static const char class_suffix[] = ".class";
1318 
1319   char* const file_name = NEW_RESOURCE_ARRAY(char,
1320                                              class_name_len +
1321                                              sizeof(class_suffix)); // includes term NULL
1322 
1323   strncpy(file_name, class_name, class_name_len);
1324   strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1325 
1326   return file_name;
1327 }
1328 
1329 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1330                                       const GrowableArray<ModuleClassPathList*>* const module_list) {
1331   int num_of_entries = module_list->length();
1332   const Symbol* class_module_name = mod_entry->name();
1333 
1334   // Loop through all the modules in either the patch-module or exploded entries looking for module
1335   for (int i = 0; i < num_of_entries; i++) {
1336     ModuleClassPathList* module_cpl = module_list->at(i);
1337     Symbol* module_cpl_name = module_cpl->module_name();
1338 
1339     if (module_cpl_name->fast_compare(class_module_name) == 0) {
1340       // Class' module has been located.
1341       return module_cpl->module_first_entry();
1342     }
1343   }
1344   return NULL;
1345 }
1346 
1347 
1348 // Search either the patch-module or exploded build entries for class.
1349 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1350                                                     const char* const class_name,
1351                                                     const char* const file_name,
1352                                                     TRAPS) {
1353   ClassFileStream* stream = NULL;
1354 
1355   // Find the class' defining module in the boot loader's module entry table
1356   PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1357   ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1358 
1359   // If the module system has not defined java.base yet, then
1360   // classes loaded are assumed to be defined to java.base.
1361   // When java.base is eventually defined by the module system,
1362   // all packages of classes that have been previously loaded
1363   // are verified in ModuleEntryTable::verify_javabase_packages().
1364   if (!Universe::is_module_initialized() &&
1365       !ModuleEntryTable::javabase_defined() &&
1366       mod_entry == NULL) {
1367     mod_entry = ModuleEntryTable::javabase_moduleEntry();
1368   }
1369 
1370   // The module must be a named module
1371   ClassPathEntry* e = NULL;
1372   if (mod_entry != NULL && mod_entry->is_named()) {
1373     if (module_list == _exploded_entries) {
1374       // The exploded build entries can be added to at any time so a lock is
1375       // needed when searching them.
1376       assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1377       MutexLocker ml(Module_lock, THREAD);
1378       e = find_first_module_cpe(mod_entry, module_list);
1379     } else {
1380       e = find_first_module_cpe(mod_entry, module_list);
1381     }
1382   }
1383 
1384   // Try to load the class from the module's ClassPathEntry list.
1385   while (e != NULL) {
1386     stream = e->open_stream(file_name, CHECK_NULL);
1387     // No context.check is required since CDS is not supported
1388     // for an exploded modules build or if --patch-module is specified.
1389     if (NULL != stream) {
1390       return stream;
1391     }
1392     e = e->next();
1393   }
1394   // If the module was located, break out even if the class was not
1395   // located successfully from that module's ClassPathEntry list.
1396   // There will not be another valid entry for that module.
1397   return NULL;
1398 }
1399 
1400 // Called by the boot classloader to load classes
1401 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1402   assert(name != NULL, "invariant");
1403   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1404 
1405   ResourceMark rm(THREAD);
1406   HandleMark hm(THREAD);
1407 
1408   const char* const class_name = name->as_C_string();
1409 
1410   EventMark m("loading class %s", class_name);
1411 
1412   const char* const file_name = file_name_for_class_name(class_name,
1413                                                          name->utf8_length());
1414   assert(file_name != NULL, "invariant");
1415 
1416   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1417 
1418   // Lookup stream for parsing .class file
1419   ClassFileStream* stream = NULL;
1420   s2 classpath_index = 0;
1421   ClassPathEntry* e = NULL;
1422 
1423   // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1424   //   - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1425   //
1426   // If search_append_only is true, boot loader visibility boundaries are
1427   // set to be _first_append_entry to the end. This includes:
1428   //   [-Xbootclasspath/a]; [jvmti appended entries]
1429   //
1430   // If both DumpSharedSpaces and search_append_only are false, boot loader
1431   // visibility boundaries are set to be the --patch-module entries plus the base piece.
1432   // This would include:
1433   //   [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1434   //
1435 
1436   // Load Attempt #1: --patch-module
1437   // Determine the class' defining module.  If it appears in the _patch_mod_entries,
1438   // attempt to load the class from those locations specific to the module.
1439   // Specifications to --patch-module can contain a partial number of classes
1440   // that are part of the overall module definition.  So if a particular class is not
1441   // found within its module specification, the search should continue to Load Attempt #2.
1442   // Note: The --patch-module entries are never searched if the boot loader's
1443   //       visibility boundary is limited to only searching the append entries.
1444   if (_patch_mod_entries != NULL && !search_append_only) {
1445     // At CDS dump time, the --patch-module entries are ignored. That means a
1446     // class is still loaded from the runtime image even if it might
1447     // appear in the _patch_mod_entries. The runtime shared class visibility
1448     // check will determine if a shared class is visible based on the runtime
1449     // environemnt, including the runtime --patch-module setting.
1450     if (!DumpSharedSpaces) {
1451       stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1452     }
1453   }
1454 
1455   // Load Attempt #2: [jimage | exploded build]
1456   if (!search_append_only && (NULL == stream)) {
1457     if (has_jrt_entry()) {
1458       e = _jrt_entry;
1459       stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1460       if (!context.check(stream, classpath_index)) {
1461         return NULL;
1462       }
1463     } else {
1464       // Exploded build - attempt to locate class in its defining module's location.
1465       assert(_exploded_entries != NULL, "No exploded build entries present");
1466       stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1467     }
1468   }
1469 
1470   // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1471   if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1472     // For the boot loader append path search, the starting classpath_index
1473     // for the appended piece is always 1 to account for either the
1474     // _jrt_entry or the _exploded_entries.
1475     assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1476     classpath_index = 1;
1477 
1478     e = _first_append_entry;
1479     while (e != NULL) {
1480       stream = e->open_stream(file_name, CHECK_NULL);
1481       if (!context.check(stream, classpath_index)) {
1482         return NULL;
1483       }
1484       if (NULL != stream) {
1485         break;
1486       }
1487       e = e->next();
1488       ++classpath_index;
1489     }
1490   }
1491 
1492   if (NULL == stream) {
1493     return NULL;
1494   }
1495 
1496   stream->set_verify(context.should_verify(classpath_index));
1497 
1498   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1499   Handle protection_domain;
1500 
1501   InstanceKlass* result = KlassFactory::create_from_stream(stream,
1502                                                            name,
1503                                                            loader_data,
1504                                                            protection_domain,
1505                                                            NULL, // host_klass
1506                                                            NULL, // cp_patches
1507                                                            THREAD);
1508   if (HAS_PENDING_EXCEPTION) {
1509     if (DumpSharedSpaces) {
1510       tty->print_cr("Preload Error: Failed to load %s", class_name);
1511     }
1512     return NULL;
1513   }
1514 
1515   if (!add_package(file_name, classpath_index, THREAD)) {
1516     return NULL;
1517   }
1518 
1519   return result;
1520 }
1521 
1522 #if INCLUDE_CDS
1523 static char* skip_uri_protocol(char* source) {
1524   if (strncmp(source, "file:", 5) == 0) {
1525     // file: protocol path could start with file:/ or file:///
1526     // locate the char after all the forward slashes
1527     int offset = 5;
1528     while (*(source + offset) == '/') {
1529         offset++;
1530     }
1531     source += offset;
1532   // for non-windows platforms, move back one char as the path begins with a '/'
1533 #ifndef _WINDOWS
1534     source -= 1;
1535 #endif
1536   } else if (strncmp(source, "jrt:/", 5) == 0) {
1537     source += 5;
1538   }
1539   return source;
1540 }
1541 
1542 // Record the shared classpath index and loader type for classes loaded
1543 // by the builtin loaders at dump time.
1544 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream) {
1545   assert(DumpSharedSpaces, "sanity");
1546   assert(stream != NULL, "sanity");
1547 
1548   if (ik->is_anonymous()) {
1549     // We do not archive anonymous classes.
1550     return;
1551   }
1552 
1553   char* src = (char*)stream->source();
1554   if (src == NULL) {
1555     if (ik->class_loader() == NULL) {
1556       // JFR classes
1557       ik->set_shared_classpath_index(0);
1558       ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1559     }
1560     return;
1561   }
1562 
1563   assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1564 
1565   ModuleEntry* module = ik->module();
1566   int classpath_index = -1;
1567   ResourceMark rm;
1568   char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN);
1569 
1570   // save the path from the file: protocol or the module name from the jrt: protocol
1571   // if no protocol prefix is found, path is the same as stream->source()
1572   char* path = skip_uri_protocol(src);
1573   for (int i = 0; i < FileMapInfo::get_number_of_share_classpaths(); i++) {
1574     SharedClassPathEntry* ent = FileMapInfo::shared_classpath(i);
1575     if (get_canonical_path(ent->name(), canonical_path, JVM_MAXPATHLEN)) {
1576       // If the path (from the class stream srouce) is the same as the shared
1577       // class path, then we have a match. For classes from module image loaded by the
1578       // PlatformClassLoader, the stream->source() is not the name of the module image.
1579       // Need to look for 'jrt:' explicitly.
1580       if (strcmp(canonical_path, os::native_path((char*)path)) == 0 ||
1581           (i == 0 && string_starts_with(src, "jrt:"))) {
1582         classpath_index = i;
1583         break;
1584       }
1585     }
1586   }
1587   if (classpath_index < 0) {
1588     // Shared classpath entry table only contains boot class path and -cp path.
1589     // No path entry found for this class. Must be a shared class loaded by the
1590     // user defined classloader.
1591     assert(ik->shared_classpath_index() < 0, "Sanity");
1592     return;
1593   }
1594 
1595   const char* const class_name = ik->name()->as_C_string();
1596   const char* const file_name = file_name_for_class_name(class_name,
1597                                                          ik->name()->utf8_length());
1598   assert(file_name != NULL, "invariant");
1599   Thread* THREAD = Thread::current();
1600   ClassLoaderExt::Context context(class_name, file_name, CATCH);
1601   context.record_result(ik->name(), classpath_index, ik, THREAD);
1602 }
1603 #endif // INCLUDE_CDS
1604 
1605 // Initialize the class loader's access to methods in libzip.  Parse and
1606 // process the boot classpath into a list ClassPathEntry objects.  Once
1607 // this list has been created, it must not change order (see class PackageInfo)
1608 // it can be appended to and is by jvmti and the kernel vm.
1609 
1610 void ClassLoader::initialize() {
1611   EXCEPTION_MARK;
1612 
1613   if (UsePerfData) {
1614     // jvmstat performance counters
1615     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1616     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1617     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1618     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1619     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1620     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1621     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1622     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1623     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1624     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1625 
1626     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1627     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1628     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1629     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1630     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1631     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1632     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1633     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1634     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1635     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1636     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1637     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1638     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1639 
1640 
1641     // The following performance counters are added for measuring the impact
1642     // of the bug fix of 6365597. They are mainly focused on finding out
1643     // the behavior of system & user-defined classloader lock, whether
1644     // ClassLoader.loadClass/findClass is being called synchronized or not.
1645     // Also two additional counters are created to see whether 'UnsyncloadClass'
1646     // flag is being set or not and how many times load_instance_class call
1647     // fails with linkageError etc.
1648     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1649                         "systemLoaderLockContentionRate");
1650     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1651                         "nonSystemLoaderLockContentionRate");
1652     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1653                         "jvmFindLoadedClassNoLockCalls");
1654     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1655                         "jvmDefineClassNoLockCalls");
1656 
1657     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1658                         "jniDefineClassNoLockCalls");
1659 
1660     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1661                         "unsafeDefineClassCalls");
1662 
1663     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1664     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1665                         "loadInstanceClassFailRate");
1666 
1667     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1668     if (UnsyncloadClass) {
1669       _isUnsyncloadClass->inc();
1670     }
1671   }
1672 
1673   // lookup zip library entry points
1674   load_zip_library();
1675   // lookup jimage library entry points
1676   load_jimage_library();
1677 #if INCLUDE_CDS
1678   // initialize search path
1679   if (DumpSharedSpaces) {
1680     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1681   }
1682 #endif
1683   setup_bootstrap_search_path();
1684 }
1685 
1686 #if INCLUDE_CDS
1687 void ClassLoader::initialize_shared_path() {
1688   if (DumpSharedSpaces) {
1689     ClassLoaderExt::setup_search_paths();
1690     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1691   }
1692 }
1693 #endif
1694 
1695 jlong ClassLoader::classloader_time_ms() {
1696   return UsePerfData ?
1697     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1698 }
1699 
1700 jlong ClassLoader::class_init_count() {
1701   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1702 }
1703 
1704 jlong ClassLoader::class_init_time_ms() {
1705   return UsePerfData ?
1706     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1707 }
1708 
1709 jlong ClassLoader::class_verify_time_ms() {
1710   return UsePerfData ?
1711     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1712 }
1713 
1714 jlong ClassLoader::class_link_count() {
1715   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1716 }
1717 
1718 jlong ClassLoader::class_link_time_ms() {
1719   return UsePerfData ?
1720     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1721 }
1722 
1723 int ClassLoader::compute_Object_vtable() {
1724   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1725   // code to determine actual value from file
1726   // Would be value '11' if finals were in vtable
1727   int JDK_1_2_Object_vtable_size = 5;
1728   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1729 }
1730 
1731 
1732 void classLoader_init1() {
1733   ClassLoader::initialize();
1734 }
1735 
1736 // Complete the ClassPathEntry setup for the boot loader
1737 void ClassLoader::classLoader_init2(TRAPS) {
1738   // Setup the list of module/path pairs for --patch-module processing
1739   // This must be done after the SymbolTable is created in order
1740   // to use fast_compare on module names instead of a string compare.
1741   if (Arguments::get_patch_mod_prefix() != NULL) {
1742     setup_patch_mod_entries();
1743   }
1744 
1745   // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1746   // to successfully determine if java.base has been patched)
1747   create_javabase();
1748 
1749   // Setup the initial java.base/path pair for the exploded build entries.
1750   // As more modules are defined during module system initialization, more
1751   // entries will be added to the exploded build array.
1752   if (!has_jrt_entry()) {
1753     assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1754     assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1755     // Set up the boot loader's _exploded_entries list.  Note that this gets
1756     // done before loading any classes, by the same thread that will
1757     // subsequently do the first class load. So, no lock is needed for this.
1758     assert(_exploded_entries == NULL, "Should only get initialized once");
1759     _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1760       GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1761     add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1762   }
1763 }
1764 
1765 
1766 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1767   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1768   if (CanonicalizeEntry != NULL) {
1769     JavaThread* THREAD = JavaThread::current();
1770     JNIEnv* env = THREAD->jni_environment();
1771     ResourceMark rm(THREAD);
1772 
1773     // os::native_path writes into orig_copy
1774     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1775     strcpy(orig_copy, orig);
1776     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1777       return false;
1778     }
1779   } else {
1780     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1781     strncpy(out, orig, len);
1782     out[len - 1] = '\0';
1783   }
1784   return true;
1785 }
1786 
1787 void ClassLoader::create_javabase() {
1788   Thread* THREAD = Thread::current();
1789 
1790   // Create java.base's module entry for the boot
1791   // class loader prior to loading j.l.Ojbect.
1792   ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1793 
1794   // Get module entry table
1795   ModuleEntryTable* null_cld_modules = null_cld->modules();
1796   if (null_cld_modules == NULL) {
1797     vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1798   }
1799 
1800   {
1801     MutexLocker ml(Module_lock, THREAD);
1802     ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1803                                false, vmSymbols::java_base(), NULL, NULL, null_cld);
1804     if (jb_module == NULL) {
1805       vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1806     }
1807     ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1808   }
1809 }
1810 
1811 #ifndef PRODUCT
1812 
1813 // CompileTheWorld
1814 //
1815 // Iterates over all class path entries and forces compilation of all methods
1816 // in all classes found. Currently, only zip/jar archives are searched.
1817 //
1818 // The classes are loaded by the Java level bootstrap class loader, and the
1819 // initializer is called. If DelayCompilationDuringStartup is true (default),
1820 // the interpreter will run the initialization code. Note that forcing
1821 // initialization in this way could potentially lead to initialization order
1822 // problems, in which case we could just force the initialization bit to be set.
1823 
1824 
1825 // We need to iterate over the contents of a zip/jar file, so we replicate the
1826 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1827 // since jzfile already has a void* definition.
1828 //
1829 // Note that this is only used in debug mode.
1830 //
1831 // HotSpot integration note:
1832 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1833 
1834 
1835 // JDK 1.3 version
1836 typedef struct real_jzentry {         /* Zip file entry */
1837     char *name;                 /* entry name */
1838     jint time;                  /* modification time */
1839     jint size;                  /* size of uncompressed data */
1840     jint csize;                 /* size of compressed data (zero if uncompressed) */
1841     jint crc;                   /* crc of uncompressed data */
1842     char *comment;              /* optional zip file comment */
1843     jbyte *extra;               /* optional extra data */
1844     jint pos;                   /* position of LOC header (if negative) or data */
1845 } real_jzentry;
1846 
1847 typedef struct real_jzfile {  /* Zip file */
1848     char *name;                 /* zip file name */
1849     jint refs;                  /* number of active references */
1850     jint fd;                    /* open file descriptor */
1851     void *lock;                 /* read lock */
1852     char *comment;              /* zip file comment */
1853     char *msg;                  /* zip error message */
1854     void *entries;              /* array of hash cells */
1855     jint total;                 /* total number of entries */
1856     unsigned short *table;      /* Hash chain heads: indexes into entries */
1857     jint tablelen;              /* number of hash eads */
1858     real_jzfile *next;        /* next zip file in search list */
1859     jzentry *cache;             /* we cache the most recently freed jzentry */
1860     /* Information on metadata names in META-INF directory */
1861     char **metanames;           /* array of meta names (may have null names) */
1862     jint metacount;             /* number of slots in metanames array */
1863     /* If there are any per-entry comments, they are in the comments array */
1864     char **comments;
1865 } real_jzfile;
1866 
1867 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1868   // For now we only compile all methods in all classes in zip/jar files
1869   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1870   tty->cr();
1871 }
1872 
1873 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1874   real_jzfile* zip = (real_jzfile*) _zip;
1875   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1876   tty->cr();
1877   // Iterate over all entries in zip file
1878   for (int n = 0; ; n++) {
1879     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1880     if (ze == NULL) break;
1881     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1882   }
1883   if (HAS_PENDING_EXCEPTION) {
1884     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1885       CLEAR_PENDING_EXCEPTION;
1886       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1887       tty->print_cr("Increase class metadata storage if a limit was set");
1888     } else {
1889       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1890     }
1891   }
1892 }
1893 
1894 void ClassLoader::compile_the_world() {
1895   EXCEPTION_MARK;
1896   HandleMark hm(THREAD);
1897   ResourceMark rm(THREAD);
1898 
1899   assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1900 
1901   // Find bootstrap loader
1902   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1903   jlong start = os::javaTimeMillis();
1904 
1905   // Compile the world for the modular java runtime image
1906   _jrt_entry->compile_the_world(system_class_loader, CATCH);
1907 
1908   // Iterate over all bootstrap class path appended entries
1909   ClassPathEntry* e = _first_append_entry;
1910   while (e != NULL) {
1911     assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1912     e->compile_the_world(system_class_loader, CATCH);
1913     e = e->next();
1914   }
1915   jlong end = os::javaTimeMillis();
1916   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1917                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1918   {
1919     // Print statistics as if before normal exit:
1920     extern void print_statistics();
1921     print_statistics();
1922   }
1923   vm_exit(0);
1924 }
1925 
1926 int ClassLoader::_compile_the_world_class_counter = 0;
1927 int ClassLoader::_compile_the_world_method_counter = 0;
1928 static int _codecache_sweep_counter = 0;
1929 
1930 // Filter out all exceptions except OOMs
1931 static void clear_pending_exception_if_not_oom(TRAPS) {
1932   if (HAS_PENDING_EXCEPTION &&
1933       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1934     CLEAR_PENDING_EXCEPTION;
1935   }
1936   // The CHECK at the caller will propagate the exception out
1937 }
1938 
1939 /**
1940  * Returns if the given method should be compiled when doing compile-the-world.
1941  *
1942  * TODO:  This should be a private method in a CompileTheWorld class.
1943  */
1944 static bool can_be_compiled(const methodHandle& m, int comp_level) {
1945   assert(CompileTheWorld, "must be");
1946 
1947   // It's not valid to compile a native wrapper for MethodHandle methods
1948   // that take a MemberName appendix since the bytecode signature is not
1949   // correct.
1950   vmIntrinsics::ID iid = m->intrinsic_id();
1951   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1952     return false;
1953   }
1954 
1955   return CompilationPolicy::can_be_compiled(m, comp_level);
1956 }
1957 
1958 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1959   if (string_ends_with(name, ".class")) {
1960     // We have a .class file
1961     int len = (int)strlen(name);
1962     char buffer[2048];
1963     strncpy(buffer, name, len - 6);
1964     buffer[len-6] = 0;
1965     // If the file has a period after removing .class, it's not really a
1966     // valid class file.  The class loader will check everything else.
1967     if (strchr(buffer, '.') == NULL) {
1968       _compile_the_world_class_counter++;
1969       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1970 
1971       // Construct name without extension
1972       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1973       // Use loader to load and initialize class
1974       Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1975       if (k != NULL && !HAS_PENDING_EXCEPTION) {
1976         k->initialize(THREAD);
1977       }
1978       bool exception_occurred = HAS_PENDING_EXCEPTION;
1979       clear_pending_exception_if_not_oom(CHECK);
1980       if (CompileTheWorldPreloadClasses && k != NULL) {
1981         InstanceKlass* ik = InstanceKlass::cast(k);
1982         ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1983         if (HAS_PENDING_EXCEPTION) {
1984           // If something went wrong in preloading we just ignore it
1985           clear_pending_exception_if_not_oom(CHECK);
1986           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1987         }
1988       }
1989 
1990       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1991         if (k == NULL || exception_occurred) {
1992           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1993           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1994         } else {
1995           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1996           // Preload all classes to get around uncommon traps
1997           // Iterate over all methods in class
1998           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1999           InstanceKlass* ik = InstanceKlass::cast(k);
2000           for (int n = 0; n < ik->methods()->length(); n++) {
2001             methodHandle m (THREAD, ik->methods()->at(n));
2002             if (can_be_compiled(m, comp_level)) {
2003               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
2004                 // Give sweeper a chance to keep up with CTW
2005                 VM_CTWThreshold op;
2006                 VMThread::execute(&op);
2007                 _codecache_sweep_counter = 0;
2008               }
2009               // Force compilation
2010               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
2011                                             methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2012               if (HAS_PENDING_EXCEPTION) {
2013                 clear_pending_exception_if_not_oom(CHECK);
2014                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2015               } else {
2016                 _compile_the_world_method_counter++;
2017               }
2018               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2019                 // Clobber the first compile and force second tier compilation
2020                 CompiledMethod* nm = m->code();
2021                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2022                   // Throw out the code so that the code cache doesn't fill up
2023                   nm->make_not_entrant();
2024                 }
2025                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2026                                               methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2027                 if (HAS_PENDING_EXCEPTION) {
2028                   clear_pending_exception_if_not_oom(CHECK);
2029                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2030                 } else {
2031                   _compile_the_world_method_counter++;
2032                 }
2033               }
2034             } else {
2035               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2036             }
2037 
2038             CompiledMethod* nm = m->code();
2039             if (nm != NULL && !m->is_method_handle_intrinsic()) {
2040               // Throw out the code so that the code cache doesn't fill up
2041               nm->make_not_entrant();
2042             }
2043           }
2044         }
2045       }
2046     }
2047   }
2048 }
2049 
2050 #endif //PRODUCT
2051 
2052 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2053 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2054 void PerfClassTraceTime::initialize() {
2055   if (!UsePerfData) return;
2056 
2057   if (_eventp != NULL) {
2058     // increment the event counter
2059     _eventp->inc();
2060   }
2061 
2062   // stop the current active thread-local timer to measure inclusive time
2063   _prev_active_event = -1;
2064   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2065      if (_timers[i].is_active()) {
2066        assert(_prev_active_event == -1, "should have only one active timer");
2067        _prev_active_event = i;
2068        _timers[i].stop();
2069      }
2070   }
2071 
2072   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2073     // start the inclusive timer if not recursively called
2074     _t.start();
2075   }
2076 
2077   // start thread-local timer of the given event type
2078    if (!_timers[_event_type].is_active()) {
2079     _timers[_event_type].start();
2080   }
2081 }
2082 
2083 PerfClassTraceTime::~PerfClassTraceTime() {
2084   if (!UsePerfData) return;
2085 
2086   // stop the thread-local timer as the event completes
2087   // and resume the thread-local timer of the event next on the stack
2088   _timers[_event_type].stop();
2089   jlong selftime = _timers[_event_type].ticks();
2090 
2091   if (_prev_active_event >= 0) {
2092     _timers[_prev_active_event].start();
2093   }
2094 
2095   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2096 
2097   // increment the counters only on the leaf call
2098   _t.stop();
2099   _timep->inc(_t.ticks());
2100   if (_selftimep != NULL) {
2101     _selftimep->inc(selftime);
2102   }
2103   // add all class loading related event selftime to the accumulated time counter
2104   ClassLoader::perf_accumulated_time()->inc(selftime);
2105 
2106   // reset the timer
2107   _timers[_event_type].reset();
2108 }