1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileStream.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/classLoaderExt.hpp"
  30 #include "classfile/javaClasses.hpp"
  31 #include "classfile/jimage.hpp"
  32 #include "classfile/moduleEntry.hpp"
  33 #include "classfile/modules.hpp"
  34 #include "classfile/packageEntry.hpp"
  35 #include "classfile/klassFactory.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/vmSymbols.hpp"
  38 #include "compiler/compileBroker.hpp"
  39 #include "gc/shared/collectedHeap.inline.hpp"
  40 #include "gc/shared/generation.hpp"
  41 #include "interpreter/bytecodeStream.hpp"
  42 #include "interpreter/oopMapCache.hpp"
  43 #include "logging/logTag.hpp"
  44 #include "memory/allocation.inline.hpp"
  45 #include "memory/filemap.hpp"
  46 #include "memory/oopFactory.hpp"
  47 #include "memory/resourceArea.hpp"
  48 #include "memory/universe.inline.hpp"
  49 #include "oops/instanceKlass.hpp"
  50 #include "oops/instanceRefKlass.hpp"
  51 #include "oops/objArrayOop.inline.hpp"
  52 #include "oops/oop.inline.hpp"
  53 #include "oops/symbol.hpp"
  54 #include "prims/jvm_misc.hpp"
  55 #include "runtime/arguments.hpp"
  56 #include "runtime/compilationPolicy.hpp"
  57 #include "runtime/fprofiler.hpp"
  58 #include "runtime/handles.hpp"
  59 #include "runtime/handles.inline.hpp"
  60 #include "runtime/init.hpp"
  61 #include "runtime/interfaceSupport.hpp"
  62 #include "runtime/java.hpp"
  63 #include "runtime/javaCalls.hpp"
  64 #include "runtime/os.hpp"
  65 #include "runtime/threadCritical.hpp"
  66 #include "runtime/timer.hpp"
  67 #include "runtime/vm_version.hpp"
  68 #include "services/management.hpp"
  69 #include "services/threadService.hpp"
  70 #include "utilities/events.hpp"
  71 #include "utilities/hashtable.inline.hpp"
  72 #include "utilities/macros.hpp"
  73 #if INCLUDE_CDS
  74 #include "classfile/sharedClassUtil.hpp"
  75 #include "classfile/sharedPathsMiscInfo.hpp"
  76 #endif
  77 
  78 // Entry points in zip.dll for loading zip/jar file entries
  79 
  80 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  81 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  82 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  83 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  84 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  85 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  86 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  87 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  88 
  89 static ZipOpen_t         ZipOpen            = NULL;
  90 static ZipClose_t        ZipClose           = NULL;
  91 static FindEntry_t       FindEntry          = NULL;
  92 static ReadEntry_t       ReadEntry          = NULL;
  93 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  94 static GetNextEntry_t    GetNextEntry       = NULL;
  95 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  96 static ZipInflateFully_t ZipInflateFully    = NULL;
  97 static Crc32_t           Crc32              = NULL;
  98 
  99 // Entry points for jimage.dll for loading jimage file entries
 100 
 101 static JImageOpen_t                    JImageOpen                    = NULL;
 102 static JImageClose_t                   JImageClose                   = NULL;
 103 static JImagePackageToModule_t         JImagePackageToModule         = NULL;
 104 static JImageFindResource_t            JImageFindResource            = NULL;
 105 static JImageGetResource_t             JImageGetResource             = NULL;
 106 static JImageResourceIterator_t        JImageResourceIterator        = NULL;
 107 
 108 // Globals
 109 
 110 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 111 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 112 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 113 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 114 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 115 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 116 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 117 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 118 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 119 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 120 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 121 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 122 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 123 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 124 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 125 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 126 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 127 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 128 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 129 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 130 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 131 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 132 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 133 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 134 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 135 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 136 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 137 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 138 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 139 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 140 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 141 
 142 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 143 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 144 int             ClassLoader::_num_entries         = 0;
 145 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
 146 bool            ClassLoader::_has_jimage = false;
 147 #if INCLUDE_CDS
 148 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
 149 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
 150 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 151 #endif
 152 
 153 // helper routines
 154 bool string_starts_with(const char* str, const char* str_to_find) {
 155   size_t str_len = strlen(str);
 156   size_t str_to_find_len = strlen(str_to_find);
 157   if (str_to_find_len > str_len) {
 158     return false;
 159   }
 160   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 161 }
 162 
 163 static const char* get_jimage_version_string() {
 164   static char version_string[10] = "";
 165   if (version_string[0] == '\0') {
 166     jio_snprintf(version_string, sizeof(version_string), "%d.%d",
 167                  Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
 168   }
 169   return (const char*)version_string;
 170 }
 171 
 172 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
 173   size_t str_len = strlen(str);
 174   size_t str_to_find_len = strlen(str_to_find);
 175   if (str_to_find_len > str_len) {
 176     return false;
 177   }
 178   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 179 }
 180 
 181 
 182 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 183   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 184   strcpy(copy, dir);
 185   _dir = copy;
 186 }
 187 
 188 
 189 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 190   // construct full path name
 191   char path[JVM_MAXPATHLEN];
 192   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 193     return NULL;
 194   }
 195   // check if file exists
 196   struct stat st;
 197   if (os::stat(path, &st) == 0) {
 198 #if INCLUDE_CDS
 199     if (DumpSharedSpaces) {
 200       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 201       // we should never find a file underneath it -- unless user has added a new file while we are running
 202       // the dump, in which case let's quit!
 203       ShouldNotReachHere();
 204     }
 205 #endif
 206     // found file, open it
 207     int file_handle = os::open(path, 0, 0);
 208     if (file_handle != -1) {
 209       // read contents into resource array
 210       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 211       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 212       // close file
 213       os::close(file_handle);
 214       // construct ClassFileStream
 215       if (num_read == (size_t)st.st_size) {
 216         if (UsePerfData) {
 217           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 218         }
 219         // Resource allocated
 220         return new ClassFileStream(buffer,
 221                                    st.st_size,
 222                                    _dir,
 223                                    ClassFileStream::verify);
 224       }
 225     }
 226   }
 227   return NULL;
 228 }
 229 
 230 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
 231   _zip = zip;
 232   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 233   strcpy(copy, zip_name);
 234   _zip_name = copy;
 235   _is_boot_append = is_boot_append;
 236 }
 237 
 238 ClassPathZipEntry::~ClassPathZipEntry() {
 239   if (ZipClose != NULL) {
 240     (*ZipClose)(_zip);
 241   }
 242   FREE_C_HEAP_ARRAY(char, _zip_name);
 243 }
 244 
 245 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 246     // enable call to C land
 247   JavaThread* thread = JavaThread::current();
 248   ThreadToNativeFromVM ttn(thread);
 249   // check whether zip archive contains name
 250   jint name_len;
 251   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 252   if (entry == NULL) return NULL;
 253   u1* buffer;
 254   char name_buf[128];
 255   char* filename;
 256   if (name_len < 128) {
 257     filename = name_buf;
 258   } else {
 259     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 260   }
 261 
 262   // file found, get pointer to the entry in mmapped jar file.
 263   if (ReadMappedEntry == NULL ||
 264       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 265       // mmapped access not available, perhaps due to compression,
 266       // read contents into resource array
 267       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 268       buffer = NEW_RESOURCE_ARRAY(u1, size);
 269       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 270   }
 271 
 272   // return result
 273   if (nul_terminate) {
 274     buffer[*filesize] = 0;
 275   }
 276   return buffer;
 277 }
 278 
 279 #if INCLUDE_CDS
 280 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
 281   u1* buffer = NULL;
 282   if (!_is_boot_append) {
 283     assert(DumpSharedSpaces, "Should be called only for non-boot entries during dump time");
 284     // We presume default is multi-release enabled
 285     const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
 286     const char* verstr = Arguments::get_property("jdk.util.jar.version");
 287     bool is_multi_ver = (multi_ver == NULL ||
 288                          strcmp(multi_ver, "true") == 0 ||
 289                          strcmp(multi_ver, "force")  == 0) &&
 290                          is_multiple_versioned(THREAD);
 291     // command line version setting
 292     int version = 0;
 293     const int base_version = 8; // JDK8
 294     int cur_ver = JDK_Version::current().major_version();
 295     if (verstr != NULL) {
 296       version = atoi(verstr);
 297       if (version < base_version || version > cur_ver) {
 298         is_multi_ver = false;
 299         // print out warning, do not use assertion here since it will continue to look
 300         // for proper version.
 301         warning("JDK%d is not supported in multiple version jars", version);
 302       }
 303     }
 304 
 305     if (is_multi_ver) {
 306       int n;
 307       char entry_name[JVM_MAXPATHLEN];
 308       if (version > 0) {
 309         n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", version, name);
 310         entry_name[n] = '\0';
 311         buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 312         if (buffer == NULL) {
 313           warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
 314         }
 315       }
 316       if (buffer == NULL) {
 317         for (int i = cur_ver; i >= base_version; i--) {
 318           n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", i, name);
 319           entry_name[n] = '\0';
 320           buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
 321           if (buffer != NULL) {
 322             break;
 323           }
 324         }
 325       }
 326     }
 327   }
 328   return buffer;
 329 }
 330 
 331 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
 332   assert(DumpSharedSpaces, "called only at dump time");
 333   jint size;
 334   char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, false, CHECK_false);
 335   if (buffer != NULL) {
 336     if (strstr(buffer, "Multi-Release: true") != NULL) {
 337       return true;
 338     }
 339   }
 340   return false;
 341 }
 342 #endif // INCLUDE_CDS
 343 
 344 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 345   jint filesize;
 346   u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
 347   if (buffer == NULL) {
 348     buffer = open_entry(name, &filesize, false, CHECK_NULL);
 349     if (buffer == NULL) {
 350       return NULL;
 351     }
 352   }
 353   if (UsePerfData) {
 354     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 355   }
 356   // Resource allocated
 357   return new ClassFileStream(buffer,
 358                              filesize,
 359                              _zip_name,
 360                              ClassFileStream::verify);
 361 }
 362 
 363 // invoke function for each entry in the zip file
 364 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 365   JavaThread* thread = JavaThread::current();
 366   HandleMark  handle_mark(thread);
 367   ThreadToNativeFromVM ttn(thread);
 368   for (int n = 0; ; n++) {
 369     jzentry * ze = ((*GetNextEntry)(_zip, n));
 370     if (ze == NULL) break;
 371     (*f)(ze->name, context);
 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   size_t len = strlen(name) + 1;
 381   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 382   strncpy((char *)_name, name, len);
 383 }
 384 
 385 ClassPathImageEntry::~ClassPathImageEntry() {
 386   if (_name != NULL) {
 387     FREE_C_HEAP_ARRAY(const char, _name);
 388     _name = NULL;
 389   }
 390   if (_jimage != NULL) {
 391     (*JImageClose)(_jimage);
 392     _jimage = NULL;
 393   }
 394 }
 395 
 396 void ClassPathImageEntry::name_to_package(const char* name, char* buffer, int length) {
 397   const char *pslash = strrchr(name, '/');
 398   if (pslash == NULL) {
 399     buffer[0] = '\0';
 400     return;
 401   }
 402   int len = pslash - name;
 403 #if INCLUDE_CDS
 404   if (len <= 0 && DumpSharedSpaces) {
 405     buffer[0] = '\0';
 406     return;
 407   }
 408 #endif
 409   assert(len > 0, "Bad length for package name");
 410   if (len >= length) {
 411     buffer[0] = '\0';
 412     return;
 413   }
 414   // drop name after last slash (including slash)
 415   // Ex., "java/lang/String.class" => "java/lang"
 416   strncpy(buffer, name, len);
 417   // ensure string termination (strncpy does not guarantee)
 418   buffer[len] = '\0';
 419 }
 420 
 421 // For a class in a named module, look it up in the jimage file using this syntax:
 422 //    /<module-name>/<package-name>/<base-class>
 423 //
 424 // Assumptions:
 425 //     1. There are no unnamed modules in the jimage file.
 426 //     2. A package is in at most one module in the jimage file.
 427 //
 428 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 429   jlong size;
 430   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 431 
 432   if (location == 0) {
 433     char package[JIMAGE_MAX_PATH];
 434     name_to_package(name, package, JIMAGE_MAX_PATH);
 435 
 436 #if INCLUDE_CDS
 437     if (package[0] == '\0' && DumpSharedSpaces) {
 438       return NULL;
 439     }
 440 #endif
 441     if (package[0] != '\0') {
 442       if (!Universe::is_module_initialized()) {
 443         location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size);
 444 #if INCLUDE_CDS
 445         // CDS uses the boot class loader to load classes whose packages are in
 446         // modules defined for other class loaders.  So, for now, get their module
 447         // names from the "modules" jimage file.
 448         if (DumpSharedSpaces && location == 0) {
 449           const char* module_name = (*JImagePackageToModule)(_jimage, package);
 450           if (module_name != NULL) {
 451             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 452           }
 453         }
 454 #endif
 455 
 456       } else {
 457         // Get boot class loader's package entry table
 458         PackageEntryTable* pkgEntryTable =
 459           ClassLoaderData::the_null_class_loader_data()->packages();
 460         // Get package's package entry
 461         TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package, CHECK_NULL);
 462         PackageEntry* package_entry = pkgEntryTable->lookup_only(pkg_symbol);
 463 
 464         if (package_entry != NULL) {
 465           ResourceMark rm;
 466           // Get the module name
 467           ModuleEntry* module = package_entry->module();
 468           assert(module != NULL, "Boot classLoader package missing module");
 469           assert(module->is_named(), "Boot classLoader package is in unnamed module");
 470           const char* module_name = module->name()->as_C_string();
 471           if (module_name != NULL) {
 472             location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
 473           }
 474         }
 475       }
 476     }
 477   }
 478   if (location != 0) {
 479     if (UsePerfData) {
 480       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 481     }
 482     char* data = NEW_RESOURCE_ARRAY(char, size);
 483     (*JImageGetResource)(_jimage, location, data, size);
 484     // Resource allocated
 485     return new ClassFileStream((u1*)data,
 486                                (int)size,
 487                                _name,
 488                                ClassFileStream::verify);
 489   }
 490 
 491   return NULL;
 492 }
 493 
 494 #ifndef PRODUCT
 495 bool ctw_visitor(JImageFile* jimage,
 496         const char* module_name, const char* version, const char* package,
 497         const char* name, const char* extension, void* arg) {
 498   if (strcmp(extension, "class") == 0) {
 499     Thread* THREAD = Thread::current();
 500     char path[JIMAGE_MAX_PATH];
 501     jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
 502     ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
 503     return !HAS_PENDING_EXCEPTION;
 504   }
 505   return true;
 506 }
 507 
 508 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 509   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 510   tty->cr();
 511   (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
 512   if (HAS_PENDING_EXCEPTION) {
 513     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 514       CLEAR_PENDING_EXCEPTION;
 515       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 516       tty->print_cr("Increase class metadata storage if a limit was set");
 517     } else {
 518       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 519     }
 520   }
 521 }
 522 #endif
 523 
 524 bool ClassPathImageEntry::is_jrt() {
 525   return ClassLoader::is_jrt(name());
 526 }
 527 
 528 #if INCLUDE_CDS
 529 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 530   assert(DumpSharedSpaces, "only called at dump time");
 531   tty->print_cr("Hint: enable -Xlog:classpath=info to diagnose the failure");
 532   vm_exit_during_initialization(error, message);
 533 }
 534 #endif
 535 
 536 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 537   if (log_is_enabled(Info, classpath)) {
 538     ResourceMark rm;
 539     outputStream* out = Log(classpath)::info_stream();
 540     if (msg) {
 541       out->print("%s", msg);
 542     }
 543     if (name) {
 544       if (strlen(name) < 256) {
 545         out->print("%s", name);
 546       } else {
 547         // For very long paths, we need to print each character separately,
 548         // as print_cr() has a length limit
 549         while (name[0] != '\0') {
 550           out->print("%c", name[0]);
 551           name++;
 552         }
 553       }
 554     }
 555     out->cr();
 556   }
 557 }
 558 
 559 #if INCLUDE_CDS
 560 void ClassLoader::check_shared_classpath(const char *path) {
 561   if (strcmp(path, "") == 0) {
 562     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 563   }
 564 
 565   struct stat st;
 566   if (os::stat(path, &st) == 0) {
 567     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 568       if (!os::dir_is_empty(path)) {
 569         tty->print_cr("Error: non-empty directory '%s'", path);
 570         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 571       }
 572     }
 573   }
 574 }
 575 #endif
 576 
 577 void ClassLoader::setup_bootstrap_search_path() {
 578   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 579   const char* sys_class_path = Arguments::get_sysclasspath();
 580   const char* java_class_path = Arguments::get_appclasspath();
 581   if (PrintSharedArchiveAndExit) {
 582     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 583     // the same as the bootcp of the shared archive.
 584   } else {
 585     trace_class_path("bootstrap loader class path=", sys_class_path);
 586     trace_class_path("classpath: ", java_class_path);
 587   }
 588 #if INCLUDE_CDS
 589   if (DumpSharedSpaces) {
 590     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 591   }
 592 #endif
 593   setup_search_path(sys_class_path, true);
 594 }
 595 
 596 #if INCLUDE_CDS
 597 int ClassLoader::get_shared_paths_misc_info_size() {
 598   return _shared_paths_misc_info->get_used_bytes();
 599 }
 600 
 601 void* ClassLoader::get_shared_paths_misc_info() {
 602   return _shared_paths_misc_info->buffer();
 603 }
 604 
 605 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 606   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 607   bool result = checker->check();
 608   delete checker;
 609   return result;
 610 }
 611 #endif
 612 
 613 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
 614   int offset = 0;
 615   int len = (int)strlen(class_path);
 616   int end = 0;
 617   bool mark_append_entry = false;
 618 
 619   // Iterate over class path entries
 620   for (int start = 0; start < len; start = end) {
 621     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 622       end++;
 623     }
 624     EXCEPTION_MARK;
 625     ResourceMark rm(THREAD);
 626     mark_append_entry = (mark_append_entry ||
 627       (bootstrap_search && (start == Arguments::bootclassloader_append_index())));
 628     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 629     strncpy(path, &class_path[start], end - start);
 630     path[end - start] = '\0';
 631     update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search);
 632 
 633     // Check on the state of the boot loader's append path
 634     if (mark_append_entry && (_first_append_entry == NULL)) {
 635       // Failure to mark the first append entry, most likely
 636       // due to a non-existent path. Record the next entry
 637       // as the first boot loader append entry.
 638       mark_append_entry = true;
 639     } else {
 640       mark_append_entry = false;
 641     }
 642 
 643 #if INCLUDE_CDS
 644     if (DumpSharedSpaces) {
 645       check_shared_classpath(path);
 646     }
 647 #endif
 648     while (class_path[end] == os::path_separator()[0]) {
 649       end++;
 650     }
 651   }
 652 }
 653 
 654 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 655                                                      bool throw_exception,
 656                                                      bool is_boot_append, TRAPS) {
 657   JavaThread* thread = JavaThread::current();
 658   ClassPathEntry* new_entry = NULL;
 659   if ((st->st_mode & S_IFREG) == S_IFREG) {
 660     // Regular file, should be a zip or jimage file
 661     // Canonicalized filename
 662     char canonical_path[JVM_MAXPATHLEN];
 663     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 664       // This matches the classic VM
 665       if (throw_exception) {
 666         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 667       } else {
 668         return NULL;
 669       }
 670     }
 671     jint error;
 672     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 673     if (jimage != NULL) {
 674       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 675     } else {
 676       char* error_msg = NULL;
 677       jzfile* zip;
 678       {
 679         // enable call to C land
 680         ThreadToNativeFromVM ttn(thread);
 681         HandleMark hm(thread);
 682         zip = (*ZipOpen)(canonical_path, &error_msg);
 683       }
 684       if (zip != NULL && error_msg == NULL) {
 685         new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
 686       } else {
 687         ResourceMark rm(thread);
 688         char *msg;
 689         if (error_msg == NULL) {
 690           msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 691           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 692         } else {
 693           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 694           msg = NEW_RESOURCE_ARRAY(char, len); ;
 695           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 696         }
 697         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 698         if (throw_exception && is_init_completed()) {
 699           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 700         } else {
 701           return NULL;
 702         }
 703       }
 704     }
 705     log_info(classpath)("opened: %s", path);
 706     log_info(classload)("opened: %s", path);
 707   } else {
 708     // Directory
 709     new_entry = new ClassPathDirEntry(path);
 710     log_info(classload)("path: %s", path);
 711   }
 712   return new_entry;
 713 }
 714 
 715 
 716 // Create a class path zip entry for a given path (return NULL if not found
 717 // or zip/JAR file cannot be opened)
 718 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
 719   // check for a regular file
 720   struct stat st;
 721   if (os::stat(path, &st) == 0) {
 722     if ((st.st_mode & S_IFREG) == S_IFREG) {
 723       char canonical_path[JVM_MAXPATHLEN];
 724       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 725         char* error_msg = NULL;
 726         jzfile* zip;
 727         {
 728           // enable call to C land
 729           JavaThread* thread = JavaThread::current();
 730           ThreadToNativeFromVM ttn(thread);
 731           HandleMark hm(thread);
 732           zip = (*ZipOpen)(canonical_path, &error_msg);
 733         }
 734         if (zip != NULL && error_msg == NULL) {
 735           // create using canonical path
 736           return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
 737         }
 738       }
 739     }
 740   }
 741   return NULL;
 742 }
 743 
 744 // The boot class loader must adhere to specfic visibility rules.
 745 // Prior to loading a class in a named package, the package is checked
 746 // to see if it is in a module defined to the boot loader. If the
 747 // package is not in a module defined to the boot loader, the class
 748 // must be loaded only in the boot loader's append path, which
 749 // consists of [-Xbootclasspath/a]; [jvmti appended entries]
 750 void ClassLoader::set_first_append_entry(ClassPathEntry *new_entry) {
 751   if (_first_append_entry == NULL) {
 752     _first_append_entry = new_entry;
 753   }
 754 }
 755 
 756 // returns true if entry already on class path
 757 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 758   ClassPathEntry* e = _first_entry;
 759   while (e != NULL) {
 760     // assume zip entries have been canonicalized
 761     if (strcmp(entry->name(), e->name()) == 0) {
 762       return true;
 763     }
 764     e = e->next();
 765   }
 766   return false;
 767 }
 768 
 769 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 770   if (new_entry != NULL) {
 771     if (_last_entry == NULL) {
 772       _first_entry = _last_entry = new_entry;
 773     } else {
 774       _last_entry->set_next(new_entry);
 775       _last_entry = new_entry;
 776     }
 777   }
 778   _num_entries ++;
 779 }
 780 
 781 void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) {
 782   if (new_entry != NULL) {
 783     if (_last_entry == NULL) {
 784       _first_entry = _last_entry = new_entry;
 785     } else {
 786       new_entry->set_next(_first_entry);
 787       _first_entry = new_entry;
 788     }
 789   }
 790   _num_entries ++;
 791 }
 792 
 793 void ClassLoader::add_to_list(const char *apath) {
 794   update_class_path_entry_list((char*)apath, false, false, false, false);
 795 }
 796 
 797 void ClassLoader::prepend_to_list(const char *apath) {
 798   update_class_path_entry_list((char*)apath, false, false, true, false);
 799 }
 800 
 801 // Returns true IFF the file/dir exists and the entry was successfully created.
 802 bool ClassLoader::update_class_path_entry_list(const char *path,
 803                                                bool check_for_duplicates,
 804                                                bool mark_append_entry,
 805                                                bool prepend_entry,
 806                                                bool is_boot_append,
 807                                                bool throw_exception) {
 808   struct stat st;
 809   if (os::stat(path, &st) == 0) {
 810     // File or directory found
 811     ClassPathEntry* new_entry = NULL;
 812     Thread* THREAD = Thread::current();
 813     new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
 814     if (new_entry == NULL) {
 815       return false;
 816     }
 817 
 818     // Ensure that the first boot loader append entry will always be set correctly.
 819     assert((!mark_append_entry ||
 820             (mark_append_entry && (!check_for_duplicates || !contains_entry(new_entry)))),
 821            "failed to mark boot loader's first append boundary");
 822 
 823     // Do not reorder the bootclasspath which would break get_system_package().
 824     // Add new entry to linked list
 825 
 826     if (!check_for_duplicates || !contains_entry(new_entry)) {
 827       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry, prepend_entry);
 828       if (mark_append_entry) {
 829         set_first_append_entry(new_entry);
 830       }
 831     }
 832     return true;
 833   } else {
 834 #if INCLUDE_CDS
 835     if (DumpSharedSpaces) {
 836       _shared_paths_misc_info->add_nonexist_path(path);
 837     }
 838 #endif
 839     return false;
 840   }
 841 }
 842 
 843 void ClassLoader::print_bootclasspath() {
 844   ClassPathEntry* e = _first_entry;
 845   tty->print("[bootclasspath= ");
 846   while (e != NULL) {
 847     tty->print("%s ;", e->name());
 848     e = e->next();
 849   }
 850   tty->print_cr("]");
 851 }
 852 
 853 void ClassLoader::load_zip_library() {
 854   assert(ZipOpen == NULL, "should not load zip library twice");
 855   // First make sure native library is loaded
 856   os::native_java_library();
 857   // Load zip library
 858   char path[JVM_MAXPATHLEN];
 859   char ebuf[1024];
 860   void* handle = NULL;
 861   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 862     handle = os::dll_load(path, ebuf, sizeof ebuf);
 863   }
 864   if (handle == NULL) {
 865     vm_exit_during_initialization("Unable to load ZIP library", path);
 866   }
 867   // Lookup zip entry points
 868   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 869   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 870   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 871   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 872   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 873   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 874   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 875   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 876 
 877   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 878   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
 879       GetNextEntry == NULL || Crc32 == NULL) {
 880     vm_exit_during_initialization("Corrupted ZIP library", path);
 881   }
 882 
 883   if (ZipInflateFully == NULL) {
 884     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
 885   }
 886 
 887   // Lookup canonicalize entry in libjava.dll
 888   void *javalib_handle = os::native_java_library();
 889   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 890   // This lookup only works on 1.3. Do not check for non-null here
 891 }
 892 
 893 void ClassLoader::load_jimage_library() {
 894   // First make sure native library is loaded
 895   os::native_java_library();
 896   // Load jimage library
 897   char path[JVM_MAXPATHLEN];
 898   char ebuf[1024];
 899   void* handle = NULL;
 900   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
 901     handle = os::dll_load(path, ebuf, sizeof ebuf);
 902   }
 903   if (handle == NULL) {
 904     vm_exit_during_initialization("Unable to load jimage library", path);
 905   }
 906 
 907   // Lookup jimage entry points
 908   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
 909   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
 910   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
 911   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
 912   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
 913   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
 914   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
 915   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
 916   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
 917   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
 918   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
 919   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
 920 }
 921 
 922 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
 923   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
 924 }
 925 
 926 int ClassLoader::crc32(int crc, const char* buf, int len) {
 927   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
 928   return (*Crc32)(crc, (const jbyte*)buf, len);
 929 }
 930 
 931 #if INCLUDE_CDS
 932 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
 933   jlong size;
 934   JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size);
 935   if (location == 0) {
 936     vm_exit_during_initialization(
 937       "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
 938   }
 939   char* buffer = NEW_RESOURCE_ARRAY(char, size);
 940   jlong read = (*JImageGetResource)(jimage, location, buffer, size);
 941   if (read != size) {
 942     vm_exit_during_initialization(
 943       "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
 944   }
 945   char* char_buf = (char*)buffer;
 946   int buflen = (int)strlen(char_buf);
 947   char* begin_ptr = char_buf;
 948   char* end_ptr = strchr(begin_ptr, '\n');
 949   bool process_boot_modules = false;
 950   _boot_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 951     GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
 952   _platform_modules_array = new (ResourceObj::C_HEAP, mtInternal)
 953     GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
 954   while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
 955     // Allocate a buffer from the C heap to be appended to the _boot_modules_array
 956     // or the _platform_modules_array.
 957     char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
 958     strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
 959     temp_name[end_ptr - begin_ptr] = '\0';
 960     if (strncmp(temp_name, "BOOT", 4) == 0) {
 961       process_boot_modules = true;
 962       FREE_C_HEAP_ARRAY(char, temp_name);
 963     } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
 964       process_boot_modules = false;
 965       FREE_C_HEAP_ARRAY(char, temp_name);
 966     } else {
 967       // module name
 968       if (process_boot_modules) {
 969         _boot_modules_array->append(temp_name);
 970       } else {
 971         _platform_modules_array->append(temp_name);
 972       }
 973     }
 974     begin_ptr = ++end_ptr;
 975     end_ptr = strchr(begin_ptr, '\n');
 976   }
 977   FREE_RESOURCE_ARRAY(u1, buffer, size);
 978 }
 979 #endif
 980 
 981 // Function add_package extracts the package from the fully qualified class name
 982 // and checks if the package is in the boot loader's package entry table.  If so,
 983 // then it sets the classpath_index in the package entry record.
 984 //
 985 // The classpath_index field is used to find the entry on the boot loader class
 986 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
 987 // in an unnamed module.  It is also used to indicate (for all packages whose
 988 // classes are loaded by the boot loader) that at least one of the package's
 989 // classes has been loaded.
 990 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
 991   assert(fullq_class_name != NULL, "just checking");
 992 
 993   // Get package name from fully qualified class name.
 994   const char *cp = strrchr(fullq_class_name, '/');
 995   if (cp != NULL) {
 996     int len = cp - fullq_class_name;
 997     PackageEntryTable* pkg_entry_tbl =
 998       ClassLoaderData::the_null_class_loader_data()->packages();
 999     TempNewSymbol pkg_symbol =
1000       SymbolTable::new_symbol(fullq_class_name, len, CHECK_false);
1001     PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1002     if (pkg_entry != NULL) {
1003       assert(classpath_index != -1, "Unexpected classpath_index");
1004       pkg_entry->set_classpath_index(classpath_index);
1005     } else {
1006       return false;
1007     }
1008   }
1009   return true;
1010 }
1011 
1012 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1013   // Look up the name in the boot loader's package entry table.
1014   if (name != NULL) {
1015     TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1016     // Look for the package entry in the boot loader's package entry table.
1017     PackageEntry* package =
1018       ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1019 
1020     // Return NULL if package does not exist or if no classes in that package
1021     // have been loaded.
1022     if (package != NULL && package->has_loaded_class()) {
1023       ModuleEntry* module = package->module();
1024       if (module->location() != NULL) {
1025         ResourceMark rm(THREAD);
1026         Handle ml = java_lang_String::create_from_str(
1027           module->location()->as_C_string(), THREAD);
1028         return ml();
1029       }
1030       // Return entry on boot loader class path.
1031       Handle cph = java_lang_String::create_from_str(
1032         ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1033       return cph();
1034     }
1035   }
1036   return NULL;
1037 }
1038 
1039 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1040   ResourceMark rm(THREAD);
1041   // List of pointers to PackageEntrys that have loaded classes.
1042   GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1043   {
1044     MutexLocker ml(Module_lock, THREAD);
1045 
1046     PackageEntryTable* pe_table =
1047       ClassLoaderData::the_null_class_loader_data()->packages();
1048 
1049     // Collect the packages that have at least one loaded class.
1050     for (int x = 0; x < pe_table->table_size(); x++) {
1051       for (PackageEntry* package_entry = pe_table->bucket(x);
1052            package_entry != NULL;
1053            package_entry = package_entry->next()) {
1054         if (package_entry->has_loaded_class()) {
1055           loaded_class_pkgs->append(package_entry);
1056         }
1057       }
1058     }
1059   }
1060 
1061 
1062   // Allocate objArray and fill with java.lang.String
1063   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1064                                            loaded_class_pkgs->length(), CHECK_NULL);
1065   objArrayHandle result(THREAD, r);
1066   for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1067     PackageEntry* package_entry = loaded_class_pkgs->at(x);
1068     Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1069     result->obj_at_put(x, str());
1070   }
1071   return result();
1072 }
1073 
1074 #if INCLUDE_CDS
1075 s2 ClassLoader::module_to_classloader(const char* module_name) {
1076 
1077   assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1078   assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1079 
1080   int array_size = _boot_modules_array->length();
1081   for (int i = 0; i < array_size; i++) {
1082     if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1083       return BOOT_LOADER;
1084     }
1085   }
1086 
1087   array_size = _platform_modules_array->length();
1088   for (int i = 0; i < array_size; i++) {
1089     if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1090       return PLATFORM_LOADER;
1091     }
1092   }
1093 
1094   return APP_LOADER;
1095 }
1096 #endif
1097 
1098 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e,
1099                                      int classpath_index, TRAPS) {
1100 #if INCLUDE_CDS
1101   // obtain the classloader type based on the class name.
1102   // First obtain the package name based on the class name. Then obtain
1103   // the classloader type based on the package name from the jimage using
1104   // a jimage API. If the classloader type cannot be found from the
1105   // jimage, it is determined by the class path entry.
1106   jshort loader_type = ClassLoader::APP_LOADER;
1107   if (e->is_jrt()) {
1108     int length = 0;
1109     const jbyte* pkg_string = InstanceKlass::package_from_name(class_name, length);
1110     if (pkg_string != NULL) {
1111       ResourceMark rm;
1112       TempNewSymbol pkg_name = SymbolTable::new_symbol((const char*)pkg_string, length, THREAD);
1113       const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1114       ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1115       JImageFile* jimage = cpie->jimage();
1116       char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1117       if (module_name != NULL) {
1118         loader_type = ClassLoader::module_to_classloader(module_name);
1119       }
1120     }
1121   } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1122     loader_type = ClassLoader::BOOT_LOADER;
1123   }
1124   return loader_type;
1125 #endif
1126   return ClassLoader::BOOT_LOADER; // the classloader type is ignored in non-CDS cases
1127 }
1128 
1129 
1130 // caller needs ResourceMark
1131 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1132                                                   int class_name_len) {
1133   assert(class_name != NULL, "invariant");
1134   assert((int)strlen(class_name) == class_name_len, "invariant");
1135 
1136   static const char class_suffix[] = ".class";
1137 
1138   char* const file_name = NEW_RESOURCE_ARRAY(char,
1139                                              class_name_len +
1140                                              sizeof(class_suffix)); // includes term NULL
1141 
1142   strncpy(file_name, class_name, class_name_len);
1143   strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1144 
1145   return file_name;
1146 }
1147 
1148 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1149 
1150   assert(name != NULL, "invariant");
1151   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1152 
1153   ResourceMark rm;
1154   HandleMark hm;
1155 
1156   const char* const class_name = name->as_C_string();
1157 
1158   EventMark m("loading class %s", class_name);
1159   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1160 
1161   const char* const file_name = file_name_for_class_name(class_name,
1162                                                          name->utf8_length());
1163   assert(file_name != NULL, "invariant");
1164 
1165   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1166 
1167   // Lookup stream for parsing .class file
1168   ClassFileStream* stream = NULL;
1169   s2 classpath_index = 0;
1170 
1171   // If DumpSharedSpaces is true, boot loader visibility boundaries are set
1172   // to be _first_entry to the end (all path entries).
1173   //
1174   // If search_append_only is true, boot loader visibility boundaries are
1175   // set to be _fist_append_entry to the end. This includes:
1176   //   [-Xbootclasspath/a]; [jvmti appended entries]
1177   //
1178   // If both DumpSharedSpaces and search_append_only are false, boot loader
1179   // visibility boundaries are set to be _first_entry to the entry before
1180   // the _first_append_entry.  This would include:
1181   //   [-Xpatch:<dirs>];  [exploded build | modules]
1182   //
1183   // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1184   // be true at the same time.
1185   ClassPathEntry* e = (search_append_only ? _first_append_entry : _first_entry);
1186   ClassPathEntry* last_e =
1187       (search_append_only || DumpSharedSpaces ? NULL : _first_append_entry);
1188 
1189   {
1190     if (search_append_only) {
1191       // For the boot loader append path search, must calculate
1192       // the starting classpath_index prior to attempting to
1193       // load the classfile.
1194       ClassPathEntry *tmp_e = _first_entry;
1195       while ((tmp_e != NULL) && (tmp_e != _first_append_entry)) {
1196         tmp_e = tmp_e->next();
1197         ++classpath_index;
1198       }
1199     }
1200 
1201     // Attempt to load the classfile from either:
1202     //   - [-Xpatch:dir]; exploded build | modules
1203     //     or
1204     //   - [-Xbootclasspath/a]; [jvmti appended entries]
1205     while ((e != NULL) && (e != last_e)) {
1206       stream = e->open_stream(file_name, CHECK_NULL);
1207       if (!context.check(stream, classpath_index)) {
1208         return NULL;
1209       }
1210       if (NULL != stream) {
1211         break;
1212       }
1213       e = e->next();
1214       ++classpath_index;
1215     }
1216   }
1217 
1218   if (NULL == stream) {
1219     if (DumpSharedSpaces) {
1220       tty->print_cr("Preload Warning: Cannot find %s", class_name);
1221     }
1222     return NULL;
1223   }
1224 
1225   stream->set_verify(context.should_verify(classpath_index));
1226 
1227   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1228   Handle protection_domain;
1229 
1230   instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1231                                                                 name,
1232                                                                 loader_data,
1233                                                                 protection_domain,
1234                                                                 NULL, // host_klass
1235                                                                 NULL, // cp_patches
1236                                                                 NULL, // parsed_name
1237                                                                 THREAD);
1238   if (HAS_PENDING_EXCEPTION) {
1239     if (DumpSharedSpaces) {
1240       tty->print_cr("Preload Error: Failed to load %s", class_name);
1241     }
1242     return NULL;
1243   }
1244 
1245   jshort loader_type = classloader_type(name, e, classpath_index, CHECK_NULL);
1246   return context.record_result(classpath_index, loader_type, e, result, THREAD);
1247 }
1248 
1249 // Initialize the class loader's access to methods in libzip.  Parse and
1250 // process the boot classpath into a list ClassPathEntry objects.  Once
1251 // this list has been created, it must not change order (see class PackageInfo)
1252 // it can be appended to and is by jvmti and the kernel vm.
1253 
1254 void ClassLoader::initialize() {
1255   EXCEPTION_MARK;
1256 
1257   if (UsePerfData) {
1258     // jvmstat performance counters
1259     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1260     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1261     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1262     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1263     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1264     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1265     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1266     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1267     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1268     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1269 
1270     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1271     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1272     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1273     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1274     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1275     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1276     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1277     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1278     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1279     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1280     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1281     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1282     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1283 
1284 
1285     // The following performance counters are added for measuring the impact
1286     // of the bug fix of 6365597. They are mainly focused on finding out
1287     // the behavior of system & user-defined classloader lock, whether
1288     // ClassLoader.loadClass/findClass is being called synchronized or not.
1289     // Also two additional counters are created to see whether 'UnsyncloadClass'
1290     // flag is being set or not and how many times load_instance_class call
1291     // fails with linkageError etc.
1292     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1293                         "systemLoaderLockContentionRate");
1294     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1295                         "nonSystemLoaderLockContentionRate");
1296     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1297                         "jvmFindLoadedClassNoLockCalls");
1298     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1299                         "jvmDefineClassNoLockCalls");
1300 
1301     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1302                         "jniDefineClassNoLockCalls");
1303 
1304     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1305                         "unsafeDefineClassCalls");
1306 
1307     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1308     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1309                         "loadInstanceClassFailRate");
1310 
1311     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1312     if (UnsyncloadClass) {
1313       _isUnsyncloadClass->inc();
1314     }
1315   }
1316 
1317   // lookup zip library entry points
1318   load_zip_library();
1319   // lookup jimage library entry points
1320   load_jimage_library();
1321 #if INCLUDE_CDS
1322   // initialize search path
1323   if (DumpSharedSpaces) {
1324     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1325   }
1326 #endif
1327   setup_bootstrap_search_path();
1328 }
1329 
1330 #if INCLUDE_CDS
1331 void ClassLoader::initialize_shared_path() {
1332   if (DumpSharedSpaces) {
1333     ClassLoaderExt::setup_search_paths();
1334     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1335   }
1336 }
1337 #endif
1338 
1339 jlong ClassLoader::classloader_time_ms() {
1340   return UsePerfData ?
1341     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1342 }
1343 
1344 jlong ClassLoader::class_init_count() {
1345   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1346 }
1347 
1348 jlong ClassLoader::class_init_time_ms() {
1349   return UsePerfData ?
1350     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1351 }
1352 
1353 jlong ClassLoader::class_verify_time_ms() {
1354   return UsePerfData ?
1355     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1356 }
1357 
1358 jlong ClassLoader::class_link_count() {
1359   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1360 }
1361 
1362 jlong ClassLoader::class_link_time_ms() {
1363   return UsePerfData ?
1364     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1365 }
1366 
1367 int ClassLoader::compute_Object_vtable() {
1368   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1369   // code to determine actual value from file
1370   // Would be value '11' if finals were in vtable
1371   int JDK_1_2_Object_vtable_size = 5;
1372   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1373 }
1374 
1375 
1376 void classLoader_init() {
1377   ClassLoader::initialize();
1378 }
1379 
1380 
1381 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1382   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1383   if (CanonicalizeEntry != NULL) {
1384     JavaThread* THREAD = JavaThread::current();
1385     JNIEnv* env = THREAD->jni_environment();
1386     ResourceMark rm(THREAD);
1387 
1388     // os::native_path writes into orig_copy
1389     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1390     strcpy(orig_copy, orig);
1391     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1392       return false;
1393     }
1394   } else {
1395     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1396     strncpy(out, orig, len);
1397     out[len - 1] = '\0';
1398   }
1399   return true;
1400 }
1401 
1402 void ClassLoader::create_javabase() {
1403   Thread* THREAD = Thread::current();
1404 
1405   // Create java.base's module entry for the boot
1406   // class loader prior to loading j.l.Ojbect.
1407   ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1408 
1409   // Get module entry table
1410   ModuleEntryTable* null_cld_modules = null_cld->modules();
1411   if (null_cld_modules == NULL) {
1412     vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1413   }
1414 
1415   {
1416     MutexLocker ml(Module_lock, THREAD);
1417     ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld);
1418     if (jb_module == NULL) {
1419       vm_exit_during_initialization("Unable to create ModuleEntry for java.base");
1420     }
1421     ModuleEntryTable::set_javabase_module(jb_module);
1422   }
1423 
1424   // When looking for the jimage file, only
1425   // search the boot loader's module path which
1426   // can consist of [-Xpatch]; exploded build | modules
1427   // Do not search the boot loader's append path.
1428   ClassPathEntry* e = _first_entry;
1429   ClassPathEntry* last_e = _first_append_entry;
1430   while ((e != NULL) && (e != last_e)) {
1431     JImageFile *jimage = e->jimage();
1432     if (jimage != NULL && e->is_jrt()) {
1433       set_has_jimage(true);
1434 #if INCLUDE_CDS
1435       ClassLoader::initialize_module_loader_map(jimage);
1436 #endif
1437       return;
1438     }
1439     e = e->next();
1440   }
1441 }
1442 
1443 #ifndef PRODUCT
1444 
1445 // CompileTheWorld
1446 //
1447 // Iterates over all class path entries and forces compilation of all methods
1448 // in all classes found. Currently, only zip/jar archives are searched.
1449 //
1450 // The classes are loaded by the Java level bootstrap class loader, and the
1451 // initializer is called. If DelayCompilationDuringStartup is true (default),
1452 // the interpreter will run the initialization code. Note that forcing
1453 // initialization in this way could potentially lead to initialization order
1454 // problems, in which case we could just force the initialization bit to be set.
1455 
1456 
1457 // We need to iterate over the contents of a zip/jar file, so we replicate the
1458 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1459 // since jzfile already has a void* definition.
1460 //
1461 // Note that this is only used in debug mode.
1462 //
1463 // HotSpot integration note:
1464 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1465 
1466 
1467 // JDK 1.3 version
1468 typedef struct real_jzentry {         /* Zip file entry */
1469     char *name;                 /* entry name */
1470     jint time;                  /* modification time */
1471     jint size;                  /* size of uncompressed data */
1472     jint csize;                 /* size of compressed data (zero if uncompressed) */
1473     jint crc;                   /* crc of uncompressed data */
1474     char *comment;              /* optional zip file comment */
1475     jbyte *extra;               /* optional extra data */
1476     jint pos;                   /* position of LOC header (if negative) or data */
1477 } real_jzentry;
1478 
1479 typedef struct real_jzfile {  /* Zip file */
1480     char *name;                 /* zip file name */
1481     jint refs;                  /* number of active references */
1482     jint fd;                    /* open file descriptor */
1483     void *lock;                 /* read lock */
1484     char *comment;              /* zip file comment */
1485     char *msg;                  /* zip error message */
1486     void *entries;              /* array of hash cells */
1487     jint total;                 /* total number of entries */
1488     unsigned short *table;      /* Hash chain heads: indexes into entries */
1489     jint tablelen;              /* number of hash eads */
1490     real_jzfile *next;        /* next zip file in search list */
1491     jzentry *cache;             /* we cache the most recently freed jzentry */
1492     /* Information on metadata names in META-INF directory */
1493     char **metanames;           /* array of meta names (may have null names) */
1494     jint metacount;             /* number of slots in metanames array */
1495     /* If there are any per-entry comments, they are in the comments array */
1496     char **comments;
1497 } real_jzfile;
1498 
1499 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1500   // For now we only compile all methods in all classes in zip/jar files
1501   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1502   tty->cr();
1503 }
1504 
1505 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1506   real_jzfile* zip = (real_jzfile*) _zip;
1507   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1508   tty->cr();
1509   // Iterate over all entries in zip file
1510   for (int n = 0; ; n++) {
1511     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1512     if (ze == NULL) break;
1513     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1514   }
1515   if (HAS_PENDING_EXCEPTION) {
1516     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1517       CLEAR_PENDING_EXCEPTION;
1518       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1519       tty->print_cr("Increase class metadata storage if a limit was set");
1520     } else {
1521       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1522     }
1523   }
1524 }
1525 
1526 void ClassLoader::compile_the_world() {
1527   EXCEPTION_MARK;
1528   HandleMark hm(THREAD);
1529   ResourceMark rm(THREAD);
1530 
1531   // Find bootstrap loader
1532   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1533   // Iterate over all bootstrap class path entries
1534   ClassPathEntry* e = _first_entry;
1535   jlong start = os::javaTimeMillis();
1536   while (e != NULL) {
1537     // We stop at "modules" jimage, unless it is the first bootstrap path entry
1538     if (e->is_jrt() && e != _first_entry) break;
1539     e->compile_the_world(system_class_loader, CATCH);
1540     e = e->next();
1541   }
1542   jlong end = os::javaTimeMillis();
1543   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1544                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1545   {
1546     // Print statistics as if before normal exit:
1547     extern void print_statistics();
1548     print_statistics();
1549   }
1550   vm_exit(0);
1551 }
1552 
1553 int ClassLoader::_compile_the_world_class_counter = 0;
1554 int ClassLoader::_compile_the_world_method_counter = 0;
1555 static int _codecache_sweep_counter = 0;
1556 
1557 // Filter out all exceptions except OOMs
1558 static void clear_pending_exception_if_not_oom(TRAPS) {
1559   if (HAS_PENDING_EXCEPTION &&
1560       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1561     CLEAR_PENDING_EXCEPTION;
1562   }
1563   // The CHECK at the caller will propagate the exception out
1564 }
1565 
1566 /**
1567  * Returns if the given method should be compiled when doing compile-the-world.
1568  *
1569  * TODO:  This should be a private method in a CompileTheWorld class.
1570  */
1571 static bool can_be_compiled(methodHandle m, int comp_level) {
1572   assert(CompileTheWorld, "must be");
1573 
1574   // It's not valid to compile a native wrapper for MethodHandle methods
1575   // that take a MemberName appendix since the bytecode signature is not
1576   // correct.
1577   vmIntrinsics::ID iid = m->intrinsic_id();
1578   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1579     return false;
1580   }
1581 
1582   return CompilationPolicy::can_be_compiled(m, comp_level);
1583 }
1584 
1585 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1586   if (string_ends_with(name, ".class")) {
1587     // We have a .class file
1588     int len = (int)strlen(name);
1589     char buffer[2048];
1590     strncpy(buffer, name, len - 6);
1591     buffer[len-6] = 0;
1592     // If the file has a period after removing .class, it's not really a
1593     // valid class file.  The class loader will check everything else.
1594     if (strchr(buffer, '.') == NULL) {
1595       _compile_the_world_class_counter++;
1596       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1597 
1598       // Construct name without extension
1599       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1600       // Use loader to load and initialize class
1601       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1602       instanceKlassHandle k (THREAD, ik);
1603       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1604         k->initialize(THREAD);
1605       }
1606       bool exception_occurred = HAS_PENDING_EXCEPTION;
1607       clear_pending_exception_if_not_oom(CHECK);
1608       if (CompileTheWorldPreloadClasses && k.not_null()) {
1609         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1610         if (HAS_PENDING_EXCEPTION) {
1611           // If something went wrong in preloading we just ignore it
1612           clear_pending_exception_if_not_oom(CHECK);
1613           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1614         }
1615       }
1616 
1617       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1618         if (k.is_null() || exception_occurred) {
1619           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1620           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1621         } else {
1622           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1623           // Preload all classes to get around uncommon traps
1624           // Iterate over all methods in class
1625           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1626           for (int n = 0; n < k->methods()->length(); n++) {
1627             methodHandle m (THREAD, k->methods()->at(n));
1628             if (can_be_compiled(m, comp_level)) {
1629               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1630                 // Give sweeper a chance to keep up with CTW
1631                 VM_ForceSafepoint op;
1632                 VMThread::execute(&op);
1633                 _codecache_sweep_counter = 0;
1634               }
1635               // Force compilation
1636               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1637                                             methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1638               if (HAS_PENDING_EXCEPTION) {
1639                 clear_pending_exception_if_not_oom(CHECK);
1640                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1641               } else {
1642                 _compile_the_world_method_counter++;
1643               }
1644               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1645                 // Clobber the first compile and force second tier compilation
1646                 nmethod* nm = m->code();
1647                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1648                   // Throw out the code so that the code cache doesn't fill up
1649                   nm->make_not_entrant();
1650                   m->clear_code();
1651                 }
1652                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1653                                               methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1654                 if (HAS_PENDING_EXCEPTION) {
1655                   clear_pending_exception_if_not_oom(CHECK);
1656                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1657                 } else {
1658                   _compile_the_world_method_counter++;
1659                 }
1660               }
1661             } else {
1662               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1663             }
1664 
1665             nmethod* nm = m->code();
1666             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1667               // Throw out the code so that the code cache doesn't fill up
1668               nm->make_not_entrant();
1669               m->clear_code();
1670             }
1671           }
1672         }
1673       }
1674     }
1675   }
1676 }
1677 
1678 #endif //PRODUCT
1679 
1680 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1681 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1682 void PerfClassTraceTime::initialize() {
1683   if (!UsePerfData) return;
1684 
1685   if (_eventp != NULL) {
1686     // increment the event counter
1687     _eventp->inc();
1688   }
1689 
1690   // stop the current active thread-local timer to measure inclusive time
1691   _prev_active_event = -1;
1692   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1693      if (_timers[i].is_active()) {
1694        assert(_prev_active_event == -1, "should have only one active timer");
1695        _prev_active_event = i;
1696        _timers[i].stop();
1697      }
1698   }
1699 
1700   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1701     // start the inclusive timer if not recursively called
1702     _t.start();
1703   }
1704 
1705   // start thread-local timer of the given event type
1706    if (!_timers[_event_type].is_active()) {
1707     _timers[_event_type].start();
1708   }
1709 }
1710 
1711 PerfClassTraceTime::~PerfClassTraceTime() {
1712   if (!UsePerfData) return;
1713 
1714   // stop the thread-local timer as the event completes
1715   // and resume the thread-local timer of the event next on the stack
1716   _timers[_event_type].stop();
1717   jlong selftime = _timers[_event_type].ticks();
1718 
1719   if (_prev_active_event >= 0) {
1720     _timers[_prev_active_event].start();
1721   }
1722 
1723   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1724 
1725   // increment the counters only on the leaf call
1726   _t.stop();
1727   _timep->inc(_t.ticks());
1728   if (_selftimep != NULL) {
1729     _selftimep->inc(selftime);
1730   }
1731   // add all class loading related event selftime to the accumulated time counter
1732   ClassLoader::perf_accumulated_time()->inc(selftime);
1733 
1734   // reset the timer
1735   _timers[_event_type].reset();
1736 }