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/klassFactory.hpp"
  33 #include "classfile/systemDictionary.hpp"
  34 #include "classfile/vmSymbols.hpp"
  35 #include "compiler/compileBroker.hpp"
  36 #include "gc/shared/collectedHeap.inline.hpp"
  37 #include "gc/shared/generation.hpp"
  38 #include "interpreter/bytecodeStream.hpp"
  39 #include "interpreter/oopMapCache.hpp"
  40 #include "logging/logTag.hpp"
  41 #include "memory/allocation.inline.hpp"
  42 #include "memory/filemap.hpp"
  43 #include "memory/oopFactory.hpp"
  44 #include "memory/resourceArea.hpp"
  45 #include "memory/universe.inline.hpp"
  46 #include "oops/instanceKlass.hpp"
  47 #include "oops/instanceRefKlass.hpp"
  48 #include "oops/objArrayOop.inline.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvm_misc.hpp"
  52 #include "runtime/arguments.hpp"
  53 #include "runtime/compilationPolicy.hpp"
  54 #include "runtime/fprofiler.hpp"
  55 #include "runtime/handles.hpp"
  56 #include "runtime/handles.inline.hpp"
  57 #include "runtime/init.hpp"
  58 #include "runtime/interfaceSupport.hpp"
  59 #include "runtime/java.hpp"
  60 #include "runtime/javaCalls.hpp"
  61 #include "runtime/os.hpp"
  62 #include "runtime/threadCritical.hpp"
  63 #include "runtime/timer.hpp"
  64 #include "runtime/vm_version.hpp"
  65 #include "services/management.hpp"
  66 #include "services/threadService.hpp"
  67 #include "utilities/events.hpp"
  68 #include "utilities/hashtable.inline.hpp"
  69 #include "utilities/macros.hpp"
  70 #if INCLUDE_CDS
  71 #include "classfile/sharedClassUtil.hpp"
  72 #include "classfile/sharedPathsMiscInfo.hpp"
  73 #endif
  74 
  75 // Entry points in zip.dll for loading zip/jar file entries
  76 
  77 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
  78 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
  79 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
  80 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
  81 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
  82 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
  83 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
  84 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
  85 
  86 static ZipOpen_t         ZipOpen            = NULL;
  87 static ZipClose_t        ZipClose           = NULL;
  88 static FindEntry_t       FindEntry          = NULL;
  89 static ReadEntry_t       ReadEntry          = NULL;
  90 static ReadMappedEntry_t ReadMappedEntry    = NULL;
  91 static GetNextEntry_t    GetNextEntry       = NULL;
  92 static canonicalize_fn_t CanonicalizeEntry  = NULL;
  93 static ZipInflateFully_t ZipInflateFully    = NULL;
  94 static Crc32_t           Crc32              = NULL;
  95 
  96 // Entry points for jimage.dll for loading jimage file entries
  97 
  98 static JImageOpen_t                    JImageOpen                    = NULL;
  99 static JImageClose_t                   JImageClose                   = NULL;
 100 static JImagePackageToModule_t         JImagePackageToModule         = NULL;
 101 static JImageFindResource_t            JImageFindResource            = NULL;
 102 static JImageGetResource_t             JImageGetResource             = NULL;
 103 static JImageResourceIterator_t        JImageResourceIterator        = NULL;
 104 
 105 // Globals
 106 
 107 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 108 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 109 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 110 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 111 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 112 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 113 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 114 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 115 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 116 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 117 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 118 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 119 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 120 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 121 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 122 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 123 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 124 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 125 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 126 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 127 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 128 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 129 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 130 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 131 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 132 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 133 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 134 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 135 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 136 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 137 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 138 
 139 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 140 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 141 int             ClassLoader::_num_entries         = 0;
 142 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 143 
 144 #if INCLUDE_CDS
 145 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 146 #endif
 147 // helper routines
 148 bool string_starts_with(const char* str, const char* str_to_find) {
 149   size_t str_len = strlen(str);
 150   size_t str_to_find_len = strlen(str_to_find);
 151   if (str_to_find_len > str_len) {
 152     return false;
 153   }
 154   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 155 }
 156 
 157 static const char* get_jimage_version_string() {
 158   static char version_string[10] = "";
 159   if (version_string[0] == '\0') {
 160     jio_snprintf(version_string, sizeof(version_string), "%d.%d",
 161                  Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
 162   }
 163   return (const char*)version_string;
 164 }
 165 
 166 bool string_ends_with(const char* str, const char* str_to_find) {
 167   size_t str_len = strlen(str);
 168   size_t str_to_find_len = strlen(str_to_find);
 169   if (str_to_find_len > str_len) {
 170     return false;
 171   }
 172   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 173 }
 174 
 175 
 176 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
 177   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
 178   strcpy(copy, dir);
 179   _dir = copy;
 180 }
 181 
 182 
 183 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
 184   // construct full path name
 185   char path[JVM_MAXPATHLEN];
 186   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
 187     return NULL;
 188   }
 189   // check if file exists
 190   struct stat st;
 191   if (os::stat(path, &st) == 0) {
 192 #if INCLUDE_CDS
 193     if (DumpSharedSpaces) {
 194       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
 195       // we should never find a file underneath it -- unless user has added a new file while we are running
 196       // the dump, in which case let's quit!
 197       ShouldNotReachHere();
 198     }
 199 #endif
 200     // found file, open it
 201     int file_handle = os::open(path, 0, 0);
 202     if (file_handle != -1) {
 203       // read contents into resource array
 204       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 205       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
 206       // close file
 207       os::close(file_handle);
 208       // construct ClassFileStream
 209       if (num_read == (size_t)st.st_size) {
 210         if (UsePerfData) {
 211           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
 212         }
 213         // Resource allocated
 214         return new ClassFileStream(buffer,
 215                                    st.st_size,
 216                                    _dir,
 217                                    ClassFileStream::verify);
 218       }
 219     }
 220   }
 221   return NULL;
 222 }
 223 
 224 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
 225   _zip = zip;
 226   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
 227   strcpy(copy, zip_name);
 228   _zip_name = copy;
 229 }
 230 
 231 ClassPathZipEntry::~ClassPathZipEntry() {
 232   if (ZipClose != NULL) {
 233     (*ZipClose)(_zip);
 234   }
 235   FREE_C_HEAP_ARRAY(char, _zip_name);
 236 }
 237 
 238 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 239     // enable call to C land
 240   JavaThread* thread = JavaThread::current();
 241   ThreadToNativeFromVM ttn(thread);
 242   // check whether zip archive contains name
 243   jint name_len;
 244   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 245   if (entry == NULL) return NULL;
 246   u1* buffer;
 247   char name_buf[128];
 248   char* filename;
 249   if (name_len < 128) {
 250     filename = name_buf;
 251   } else {
 252     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 253   }
 254 
 255   // file found, get pointer to the entry in mmapped jar file.
 256   if (ReadMappedEntry == NULL ||
 257       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
 258       // mmapped access not available, perhaps due to compression,
 259       // read contents into resource array
 260       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
 261       buffer = NEW_RESOURCE_ARRAY(u1, size);
 262       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
 263   }
 264 
 265   // return result
 266   if (nul_terminate) {
 267     buffer[*filesize] = 0;
 268   }
 269   return buffer;
 270 }
 271 
 272 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
 273   jint filesize;
 274   const u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
 275   if (buffer == NULL) {
 276     return NULL;
 277   }
 278   if (UsePerfData) {
 279     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 280   }
 281   // Resource allocated
 282   return new ClassFileStream(buffer,
 283                              filesize,
 284                              _zip_name,
 285                              ClassFileStream::verify);
 286 }
 287 
 288 // invoke function for each entry in the zip file
 289 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 290   JavaThread* thread = JavaThread::current();
 291   HandleMark  handle_mark(thread);
 292   ThreadToNativeFromVM ttn(thread);
 293   for (int n = 0; ; n++) {
 294     jzentry * ze = ((*GetNextEntry)(_zip, n));
 295     if (ze == NULL) break;
 296     (*f)(ze->name, context);
 297   }
 298 }
 299 
 300 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
 301   ClassPathEntry(),
 302   _jimage(jimage) {
 303   guarantee(jimage != NULL, "jimage file is null");
 304   guarantee(name != NULL, "jimage file name is null");
 305   size_t len = strlen(name) + 1;
 306   _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
 307   strncpy((char *)_name, name, len);
 308 }
 309 
 310 ClassPathImageEntry::~ClassPathImageEntry() {
 311   if (_name != NULL) {
 312     FREE_C_HEAP_ARRAY(const char, _name);
 313     _name = NULL;
 314   }
 315   if (_jimage != NULL) {
 316     (*JImageClose)(_jimage);
 317     _jimage = NULL;
 318   }
 319 }
 320 
 321 void ClassPathImageEntry::name_to_package(const char* name, char* buffer, int length) {
 322   const char *pslash = strrchr(name, '/');
 323   if (pslash == NULL) {
 324     buffer[0] = '\0';
 325     return;
 326   }
 327   int len = pslash - name;
 328 #if INCLUDE_CDS
 329   if (len <= 0 && DumpSharedSpaces) {
 330     buffer[0] = '\0';
 331     return;
 332   }
 333 #endif
 334   assert(len > 0, "Bad length for package name");
 335   if (len >= length) {
 336     buffer[0] = '\0';
 337     return;
 338   }
 339   // drop name after last slash (including slash)
 340   // Ex., "java/lang/String.class" => "java/lang"
 341   strncpy(buffer, name, len);
 342   // ensure string termination (strncpy does not guarantee)
 343   buffer[len] = '\0';
 344 }
 345 
 346 // For a class in a named module, look it up in the jimage file using this syntax:
 347 //    /<module-name>/<package-name>/<base-class>
 348 //
 349 // Assumptions:
 350 //     1. There are no unnamed modules in the jimage file.
 351 //     2. A package is in at most one module in the jimage file.
 352 //
 353 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
 354   jlong size;
 355   JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
 356 
 357   if (location == 0) {
 358     char package[JIMAGE_MAX_PATH];
 359     name_to_package(name, package, JIMAGE_MAX_PATH);
 360     if (package[0] != '\0') {
 361         const char* module = (*JImagePackageToModule)(_jimage, package);
 362         if (module == NULL) {
 363             module = "java.base";
 364         }
 365         location = (*JImageFindResource)(_jimage, module, get_jimage_version_string(), name, &size);
 366     }
 367   }
 368 
 369   if (location != 0) {
 370     if (UsePerfData) {
 371       ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
 372     }
 373     char* data = NEW_RESOURCE_ARRAY(char, size);
 374     (*JImageGetResource)(_jimage, location, data, size);
 375     // Resource allocated
 376     return new ClassFileStream((u1*)data,
 377                                (int)size,
 378                                _name,
 379                                ClassFileStream::verify);
 380   }
 381 
 382   return NULL;
 383 }
 384 
 385 #ifndef PRODUCT
 386 bool ctw_visitor(JImageFile* jimage,
 387         const char* module_name, const char* version, const char* package,
 388         const char* name, const char* extension, void* arg) {
 389   if (strcmp(extension, "class") == 0) {
 390     Thread* THREAD = Thread::current();
 391     char path[JIMAGE_MAX_PATH];
 392     jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
 393     ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
 394     return !HAS_PENDING_EXCEPTION;
 395   }
 396   return true;
 397 }
 398 
 399 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
 400   tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
 401   tty->cr();
 402   (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
 403   if (HAS_PENDING_EXCEPTION) {
 404     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
 405       CLEAR_PENDING_EXCEPTION;
 406       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
 407       tty->print_cr("Increase class metadata storage if a limit was set");
 408     } else {
 409       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
 410     }
 411   }
 412 }
 413 
 414 bool ClassPathImageEntry::is_jrt() {
 415   return string_ends_with(name(), BOOT_IMAGE_NAME);
 416 }
 417 #endif
 418 
 419 #if INCLUDE_CDS
 420 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
 421   assert(DumpSharedSpaces, "only called at dump time");
 422   tty->print_cr("Hint: enable -Xlog:classpath=info to diagnose the failure");
 423   vm_exit_during_initialization(error, message);
 424 }
 425 #endif
 426 
 427 void ClassLoader::trace_class_path(const char* msg, const char* name) {
 428   if (log_is_enabled(Info, classpath)) {
 429     ResourceMark rm;
 430     outputStream* out = LogHandle(classpath)::info_stream();
 431     if (msg) {
 432       out->print("%s", msg);
 433     }
 434     if (name) {
 435       if (strlen(name) < 256) {
 436         out->print("%s", name);
 437       } else {
 438         // For very long paths, we need to print each character separately,
 439         // as print_cr() has a length limit
 440         while (name[0] != '\0') {
 441           out->print("%c", name[0]);
 442           name++;
 443         }
 444       }
 445     }
 446     out->cr();
 447   }
 448 }
 449 
 450 #if INCLUDE_CDS
 451 void ClassLoader::check_shared_classpath(const char *path) {
 452   if (strcmp(path, "") == 0) {
 453     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
 454   }
 455 
 456   struct stat st;
 457   if (os::stat(path, &st) == 0) {
 458     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
 459       if (!os::dir_is_empty(path)) {
 460         tty->print_cr("Error: non-empty directory '%s'", path);
 461         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
 462       }
 463     }
 464   }
 465 }
 466 #endif
 467 
 468 void ClassLoader::setup_bootstrap_search_path() {
 469   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 470   const char* sys_class_path = Arguments::get_sysclasspath();
 471   const char* java_class_path = Arguments::get_appclasspath();
 472   if (PrintSharedArchiveAndExit) {
 473     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
 474     // the same as the bootcp of the shared archive.
 475   } else {
 476     trace_class_path("bootstrap loader class path=", sys_class_path);
 477     trace_class_path("classpath: ", java_class_path);
 478   }
 479 #if INCLUDE_CDS
 480   if (DumpSharedSpaces) {
 481     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
 482   }
 483 #endif
 484   setup_search_path(sys_class_path);
 485 }
 486 
 487 #if INCLUDE_CDS
 488 int ClassLoader::get_shared_paths_misc_info_size() {
 489   return _shared_paths_misc_info->get_used_bytes();
 490 }
 491 
 492 void* ClassLoader::get_shared_paths_misc_info() {
 493   return _shared_paths_misc_info->buffer();
 494 }
 495 
 496 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
 497   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
 498   bool result = checker->check();
 499   delete checker;
 500   return result;
 501 }
 502 #endif
 503 
 504 void ClassLoader::setup_search_path(const char *class_path) {
 505   int offset = 0;
 506   int len = (int)strlen(class_path);
 507   int end = 0;
 508 
 509   // Iterate over class path entries
 510   for (int start = 0; start < len; start = end) {
 511     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 512       end++;
 513     }
 514     EXCEPTION_MARK;
 515     ResourceMark rm(THREAD);
 516     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
 517     strncpy(path, &class_path[start], end - start);
 518     path[end - start] = '\0';
 519     update_class_path_entry_list(path, false);
 520 #if INCLUDE_CDS
 521     if (DumpSharedSpaces) {
 522       check_shared_classpath(path);
 523     }
 524 #endif
 525     while (class_path[end] == os::path_separator()[0]) {
 526       end++;
 527     }
 528   }
 529 }
 530 
 531 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
 532                                                      bool throw_exception, TRAPS) {
 533   JavaThread* thread = JavaThread::current();
 534   ClassPathEntry* new_entry = NULL;
 535   if ((st->st_mode & S_IFREG) == S_IFREG) {
 536     // Regular file, should be a zip or jimage file
 537     // Canonicalized filename
 538     char canonical_path[JVM_MAXPATHLEN];
 539     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 540       // This matches the classic VM
 541       if (throw_exception) {
 542         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
 543       } else {
 544         return NULL;
 545       }
 546     }
 547     jint error;
 548     JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
 549     if (jimage != NULL) {
 550       new_entry = new ClassPathImageEntry(jimage, canonical_path);
 551     } else {
 552       char* error_msg = NULL;
 553       jzfile* zip;
 554       {
 555         // enable call to C land
 556         ThreadToNativeFromVM ttn(thread);
 557         HandleMark hm(thread);
 558         zip = (*ZipOpen)(canonical_path, &error_msg);
 559       }
 560       if (zip != NULL && error_msg == NULL) {
 561         new_entry = new ClassPathZipEntry(zip, path);
 562       } else {
 563         ResourceMark rm(thread);
 564         char *msg;
 565         if (error_msg == NULL) {
 566           msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
 567           jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
 568         } else {
 569           int len = (int)(strlen(path) + strlen(error_msg) + 128);
 570           msg = NEW_RESOURCE_ARRAY(char, len); ;
 571           jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 572         }
 573         // Don't complain about bad jar files added via -Xbootclasspath/a:.
 574         if (throw_exception && is_init_completed()) {
 575           THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
 576         } else {
 577           return NULL;
 578         }
 579       }
 580     }
 581     log_info(classpath)("opened: %s", path);
 582     log_info(classload)("opened: %s", path);
 583   } else {
 584     // Directory
 585     new_entry = new ClassPathDirEntry(path);
 586     log_info(classload)("path: %s", path);
 587   }
 588   return new_entry;
 589 }
 590 
 591 
 592 // Create a class path zip entry for a given path (return NULL if not found
 593 // or zip/JAR file cannot be opened)
 594 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
 595   // check for a regular file
 596   struct stat st;
 597   if (os::stat(path, &st) == 0) {
 598     if ((st.st_mode & S_IFREG) == S_IFREG) {
 599       char canonical_path[JVM_MAXPATHLEN];
 600       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 601         char* error_msg = NULL;
 602         jzfile* zip;
 603         {
 604           // enable call to C land
 605           JavaThread* thread = JavaThread::current();
 606           ThreadToNativeFromVM ttn(thread);
 607           HandleMark hm(thread);
 608           zip = (*ZipOpen)(canonical_path, &error_msg);
 609         }
 610         if (zip != NULL && error_msg == NULL) {
 611           // create using canonical path
 612           return new ClassPathZipEntry(zip, canonical_path);
 613         }
 614       }
 615     }
 616   }
 617   return NULL;
 618 }
 619 
 620 // returns true if entry already on class path
 621 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
 622   ClassPathEntry* e = _first_entry;
 623   while (e != NULL) {
 624     // assume zip entries have been canonicalized
 625     if (strcmp(entry->name(), e->name()) == 0) {
 626       return true;
 627     }
 628     e = e->next();
 629   }
 630   return false;
 631 }
 632 
 633 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
 634   if (new_entry != NULL) {
 635     if (_last_entry == NULL) {
 636       _first_entry = _last_entry = new_entry;
 637     } else {
 638       _last_entry->set_next(new_entry);
 639       _last_entry = new_entry;
 640     }
 641   }
 642   _num_entries ++;
 643 }
 644 
 645 // Returns true IFF the file/dir exists and the entry was successfully created.
 646 bool ClassLoader::update_class_path_entry_list(const char *path,
 647                                                bool check_for_duplicates,
 648                                                bool throw_exception) {
 649   struct stat st;
 650   if (os::stat(path, &st) == 0) {
 651     // File or directory found
 652     ClassPathEntry* new_entry = NULL;
 653     Thread* THREAD = Thread::current();
 654     new_entry = create_class_path_entry(path, &st, throw_exception, CHECK_(false));
 655     if (new_entry == NULL) {
 656       return false;
 657     }
 658     // The kernel VM adds dynamically to the end of the classloader path and
 659     // doesn't reorder the bootclasspath which would break java.lang.Package
 660     // (see PackageInfo).
 661     // Add new entry to linked list
 662     if (!check_for_duplicates || !contains_entry(new_entry)) {
 663       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
 664     }
 665     return true;
 666   } else {
 667 #if INCLUDE_CDS
 668     if (DumpSharedSpaces) {
 669       _shared_paths_misc_info->add_nonexist_path(path);
 670     }
 671 #endif
 672     return false;
 673   }
 674 }
 675 
 676 void ClassLoader::print_bootclasspath() {
 677   ClassPathEntry* e = _first_entry;
 678   tty->print("[bootclasspath= ");
 679   while (e != NULL) {
 680     tty->print("%s ;", e->name());
 681     e = e->next();
 682   }
 683   tty->print_cr("]");
 684 }
 685 
 686 void ClassLoader::load_zip_library() {
 687   assert(ZipOpen == NULL, "should not load zip library twice");
 688   // First make sure native library is loaded
 689   os::native_java_library();
 690   // Load zip library
 691   char path[JVM_MAXPATHLEN];
 692   char ebuf[1024];
 693   void* handle = NULL;
 694   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
 695     handle = os::dll_load(path, ebuf, sizeof ebuf);
 696   }
 697   if (handle == NULL) {
 698     vm_exit_during_initialization("Unable to load ZIP library", path);
 699   }
 700   // Lookup zip entry points
 701   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
 702   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
 703   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
 704   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
 705   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
 706   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
 707   ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
 708   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
 709 
 710   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
 711   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
 712       GetNextEntry == NULL || Crc32 == NULL) {
 713     vm_exit_during_initialization("Corrupted ZIP library", path);
 714   }
 715 
 716   if (ZipInflateFully == NULL) {
 717     vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
 718   }
 719 
 720   // Lookup canonicalize entry in libjava.dll
 721   void *javalib_handle = os::native_java_library();
 722   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
 723   // This lookup only works on 1.3. Do not check for non-null here
 724 }
 725 
 726 void ClassLoader::load_jimage_library() {
 727   // First make sure native library is loaded
 728   os::native_java_library();
 729   // Load jimage library
 730   char path[JVM_MAXPATHLEN];
 731   char ebuf[1024];
 732   void* handle = NULL;
 733   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
 734     handle = os::dll_load(path, ebuf, sizeof ebuf);
 735   }
 736   if (handle == NULL) {
 737     vm_exit_during_initialization("Unable to load jimage library", path);
 738   }
 739 
 740   // Lookup jimage entry points
 741   JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
 742   guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
 743   JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
 744   guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
 745   JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
 746   guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
 747   JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
 748   guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
 749   JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
 750   guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
 751   JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
 752   guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
 753 }
 754 
 755 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
 756   return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
 757 }
 758 
 759 int ClassLoader::crc32(int crc, const char* buf, int len) {
 760   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
 761   return (*Crc32)(crc, (const jbyte*)buf, len);
 762 }
 763 
 764 // PackageInfo data exists in order to support the java.lang.Package
 765 // class.  A Package object provides information about a java package
 766 // (version, vendor, etc.) which originates in the manifest of the jar
 767 // file supplying the package.  For application classes, the ClassLoader
 768 // object takes care of this.
 769 
 770 // For system (boot) classes, the Java code in the Package class needs
 771 // to be able to identify which source jar file contained the boot
 772 // class, so that it can extract the manifest from it.  This table
 773 // identifies java packages with jar files in the boot classpath.
 774 
 775 // Because the boot classpath cannot change, the classpath index is
 776 // sufficient to identify the source jar file or directory.  (Since
 777 // directories have no manifests, the directory name is not required,
 778 // but is available.)
 779 
 780 // When using sharing -- the pathnames of entries in the boot classpath
 781 // may not be the same at runtime as they were when the archive was
 782 // created (NFS, Samba, etc.).  The actual files and directories named
 783 // in the classpath must be the same files, in the same order, even
 784 // though the exact name is not the same.
 785 
 786 class PackageInfo: public BasicHashtableEntry<mtClass> {
 787 public:
 788   const char* _pkgname;       // Package name
 789   int _classpath_index;       // Index of directory or JAR file loaded from
 790 
 791   PackageInfo* next() {
 792     return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
 793   }
 794 
 795   const char* pkgname()           { return _pkgname; }
 796   void set_pkgname(char* pkgname) { _pkgname = pkgname; }
 797 
 798   const char* filename() {
 799     return ClassLoader::classpath_entry(_classpath_index)->name();
 800   }
 801 
 802   void set_index(int index) {
 803     _classpath_index = index;
 804   }
 805 };
 806 
 807 
 808 class PackageHashtable : public BasicHashtable<mtClass> {
 809 private:
 810   inline unsigned int compute_hash(const char *s, int n) {
 811     unsigned int val = 0;
 812     while (--n >= 0) {
 813       val = *s++ + 31 * val;
 814     }
 815     return val;
 816   }
 817 
 818   PackageInfo* bucket(int index) {
 819     return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
 820   }
 821 
 822   PackageInfo* get_entry(int index, unsigned int hash,
 823                          const char* pkgname, size_t n) {
 824     for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
 825       if (pp->hash() == hash &&
 826           strncmp(pkgname, pp->pkgname(), n) == 0 &&
 827           pp->pkgname()[n] == '\0') {
 828         return pp;
 829       }
 830     }
 831     return NULL;
 832   }
 833 
 834 public:
 835   PackageHashtable(int table_size)
 836     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
 837 
 838   PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
 839     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
 840 
 841   PackageInfo* get_entry(const char* pkgname, int n) {
 842     unsigned int hash = compute_hash(pkgname, n);
 843     return get_entry(hash_to_index(hash), hash, pkgname, n);
 844   }
 845 
 846   PackageInfo* new_entry(char* pkgname, int n) {
 847     unsigned int hash = compute_hash(pkgname, n);
 848     PackageInfo* pp;
 849     pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
 850     pp->set_pkgname(pkgname);
 851     return pp;
 852   }
 853 
 854   void add_entry(PackageInfo* pp) {
 855     int index = hash_to_index(pp->hash());
 856     BasicHashtable<mtClass>::add_entry(index, pp);
 857   }
 858 
 859   void copy_pkgnames(const char** packages) {
 860     int n = 0;
 861     for (int i = 0; i < table_size(); ++i) {
 862       for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
 863         packages[n++] = pp->pkgname();
 864       }
 865     }
 866     assert(n == number_of_entries(), "just checking");
 867   }
 868 
 869   CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
 870 };
 871 
 872 #if INCLUDE_CDS
 873 void PackageHashtable::copy_table(char** top, char* end,
 874                                   PackageHashtable* table) {
 875   // Copy (relocate) the table to the shared space.
 876   BasicHashtable<mtClass>::copy_table(top, end);
 877 
 878   // Calculate the space needed for the package name strings.
 879   int i;
 880   intptr_t* tableSize = (intptr_t*)(*top);
 881   *top += sizeof(intptr_t);  // For table size
 882   char* tableStart = *top;
 883 
 884   for (i = 0; i < table_size(); ++i) {
 885     for (PackageInfo* pp = table->bucket(i);
 886                       pp != NULL;
 887                       pp = pp->next()) {
 888       int n1 = (int)(strlen(pp->pkgname()) + 1);
 889       if (*top + n1 >= end) {
 890         report_out_of_shared_space(SharedMiscData);
 891       }
 892       pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
 893       *top += n1;
 894     }
 895   }
 896   *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
 897   if (*top >= end) {
 898     report_out_of_shared_space(SharedMiscData);
 899   }
 900 
 901   // Write table size
 902   intptr_t len = *top - (char*)tableStart;
 903   *tableSize = len;
 904 }
 905 
 906 
 907 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
 908   _package_hash_table->copy_buckets(top, end);
 909 }
 910 
 911 void ClassLoader::copy_package_info_table(char** top, char* end) {
 912   _package_hash_table->copy_table(top, end, _package_hash_table);
 913 }
 914 #endif
 915 
 916 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
 917   const char *cp = strrchr(pkgname, '/');
 918   if (cp != NULL) {
 919     // Package prefix found
 920     int n = cp - pkgname + 1;
 921     return _package_hash_table->get_entry(pkgname, n);
 922   }
 923   return NULL;
 924 }
 925 
 926 
 927 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
 928   assert(pkgname != NULL, "just checking");
 929   // Bootstrap loader no longer holds system loader lock obj serializing
 930   // load_instance_class and thereby add_package
 931   {
 932     MutexLocker ml(PackageTable_lock, THREAD);
 933     // First check for previously loaded entry
 934     PackageInfo* pp = lookup_package(pkgname);
 935     if (pp != NULL) {
 936       // Existing entry found, check source of package
 937       pp->set_index(classpath_index);
 938       return true;
 939     }
 940 
 941     const char *cp = strrchr(pkgname, '/');
 942     if (cp != NULL) {
 943       // Package prefix found
 944       int n = cp - pkgname + 1;
 945 
 946       char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
 947       if (new_pkgname == NULL) {
 948         return false;
 949       }
 950 
 951       memcpy(new_pkgname, pkgname, n);
 952       new_pkgname[n] = '\0';
 953       pp = _package_hash_table->new_entry(new_pkgname, n);
 954       pp->set_index(classpath_index);
 955 
 956       // Insert into hash table
 957       _package_hash_table->add_entry(pp);
 958     }
 959     return true;
 960   }
 961 }
 962 
 963 
 964 oop ClassLoader::get_system_package(const char* name, TRAPS) {
 965   PackageInfo* pp;
 966   {
 967     MutexLocker ml(PackageTable_lock, THREAD);
 968     pp = lookup_package(name);
 969   }
 970   if (pp == NULL) {
 971     return NULL;
 972   } else {
 973     Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
 974     return p();
 975   }
 976 }
 977 
 978 
 979 objArrayOop ClassLoader::get_system_packages(TRAPS) {
 980   ResourceMark rm(THREAD);
 981   int nof_entries;
 982   const char** packages;
 983   {
 984     MutexLocker ml(PackageTable_lock, THREAD);
 985     // Allocate resource char* array containing package names
 986     nof_entries = _package_hash_table->number_of_entries();
 987     if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
 988       return NULL;
 989     }
 990     _package_hash_table->copy_pkgnames(packages);
 991   }
 992   // Allocate objArray and fill with java.lang.String
 993   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
 994                                            nof_entries, CHECK_0);
 995   objArrayHandle result(THREAD, r);
 996   for (int i = 0; i < nof_entries; i++) {
 997     Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
 998     result->obj_at_put(i, str());
 999   }
1000 
1001   return result();
1002 }
1003 
1004 // caller needs ResourceMark
1005 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1006                                                   int class_name_len) {
1007   assert(class_name != NULL, "invariant");
1008   assert((int)strlen(class_name) == class_name_len, "invariant");
1009 
1010   static const char class_suffix[] = ".class";
1011 
1012   char* const file_name = NEW_RESOURCE_ARRAY(char,
1013                                              class_name_len +
1014                                              sizeof(class_suffix)); // includes term NULL
1015 
1016   strncpy(file_name, class_name, class_name_len);
1017   strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1018 
1019   return file_name;
1020 }
1021 
1022 instanceKlassHandle ClassLoader::load_class(Symbol* name, TRAPS) {
1023 
1024   assert(name != NULL, "invariant");
1025   assert(THREAD->is_Java_thread(), "must be a JavaThread");
1026 
1027   ResourceMark rm;
1028   HandleMark hm;
1029 
1030   const char* const class_name = name->as_C_string();
1031 
1032   EventMark m("loading class %s", class_name);
1033   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1034 
1035   const char* const file_name = file_name_for_class_name(class_name,
1036                                                          name->utf8_length());
1037   assert(file_name != NULL, "invariant");
1038 
1039   ClassLoaderExt::Context context(class_name, file_name, THREAD);
1040 
1041   // Lookup stream
1042   ClassFileStream* stream = NULL;
1043   int classpath_index = 0;
1044   ClassPathEntry* e = _first_entry;
1045   {
1046     PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1047       ((JavaThread*)THREAD)->get_thread_stat()->perf_timers_addr(),
1048       PerfClassTraceTime::CLASS_LOAD);
1049 
1050     for (; e != NULL; e = e->next(), ++classpath_index) {
1051       stream = e->open_stream(file_name, CHECK_NULL);
1052       if (NULL == stream) {
1053         continue;
1054       }
1055       if (!context.check(stream, classpath_index)) {
1056         return NULL;
1057       }
1058       break;
1059     }
1060   }
1061 
1062   if (NULL == stream) {
1063     if (DumpSharedSpaces) {
1064       tty->print_cr("Preload Warning: Cannot find %s", class_name);
1065     }
1066     return NULL;
1067   }
1068 
1069   stream->set_verify(context.should_verify(classpath_index));
1070 
1071   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1072   Handle protection_domain;
1073 
1074   instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1075                                                                 name,
1076                                                                 loader_data,
1077                                                                 protection_domain,
1078                                                                 NULL, // host_klass
1079                                                                 NULL, // cp_patches
1080                                                                 NULL, // parsed_name
1081                                                                 THREAD);
1082   if (HAS_PENDING_EXCEPTION) {
1083     if (DumpSharedSpaces) {
1084       tty->print_cr("Preload Error: Failed to load %s", class_name);
1085     }
1086     return NULL;
1087   }
1088 
1089   return context.record_result(classpath_index, e, result, THREAD);
1090 }
1091 
1092 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1093                                             int number_of_entries) {
1094   assert(_package_hash_table == NULL, "One package info table allowed.");
1095   assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1096          "bad shared package info size.");
1097   _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1098                                              number_of_entries);
1099 }
1100 
1101 
1102 void ClassLoader::create_package_info_table() {
1103     assert(_package_hash_table == NULL, "shouldn't have one yet");
1104     _package_hash_table = new PackageHashtable(package_hash_table_size);
1105 }
1106 
1107 
1108 // Initialize the class loader's access to methods in libzip.  Parse and
1109 // process the boot classpath into a list ClassPathEntry objects.  Once
1110 // this list has been created, it must not change order (see class PackageInfo)
1111 // it can be appended to and is by jvmti and the kernel vm.
1112 
1113 void ClassLoader::initialize() {
1114   assert(_package_hash_table == NULL, "should have been initialized by now.");
1115   EXCEPTION_MARK;
1116 
1117   if (UsePerfData) {
1118     // jvmstat performance counters
1119     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1120     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1121     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1122     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1123     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1124     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1125     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1126     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1127     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1128     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1129 
1130     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1131     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1132     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1133     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1134     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1135     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1136     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1137     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1138     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1139     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1140     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1141     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1142     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1143 
1144 
1145     // The following performance counters are added for measuring the impact
1146     // of the bug fix of 6365597. They are mainly focused on finding out
1147     // the behavior of system & user-defined classloader lock, whether
1148     // ClassLoader.loadClass/findClass is being called synchronized or not.
1149     // Also two additional counters are created to see whether 'UnsyncloadClass'
1150     // flag is being set or not and how many times load_instance_class call
1151     // fails with linkageError etc.
1152     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1153                         "systemLoaderLockContentionRate");
1154     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1155                         "nonSystemLoaderLockContentionRate");
1156     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1157                         "jvmFindLoadedClassNoLockCalls");
1158     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1159                         "jvmDefineClassNoLockCalls");
1160 
1161     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1162                         "jniDefineClassNoLockCalls");
1163 
1164     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1165                         "unsafeDefineClassCalls");
1166 
1167     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1168     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1169                         "loadInstanceClassFailRate");
1170 
1171     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1172     if (UnsyncloadClass) {
1173       _isUnsyncloadClass->inc();
1174     }
1175   }
1176 
1177   // lookup zip library entry points
1178   load_zip_library();
1179   // lookup jimage library entry points
1180   load_jimage_library();
1181 #if INCLUDE_CDS
1182   // initialize search path
1183   if (DumpSharedSpaces) {
1184     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1185   }
1186 #endif
1187   setup_bootstrap_search_path();
1188 }
1189 
1190 #if INCLUDE_CDS
1191 void ClassLoader::initialize_shared_path() {
1192   if (DumpSharedSpaces) {
1193     ClassLoaderExt::setup_search_paths();
1194     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1195   }
1196 }
1197 #endif
1198 
1199 jlong ClassLoader::classloader_time_ms() {
1200   return UsePerfData ?
1201     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1202 }
1203 
1204 jlong ClassLoader::class_init_count() {
1205   return UsePerfData ? _perf_classes_inited->get_value() : -1;
1206 }
1207 
1208 jlong ClassLoader::class_init_time_ms() {
1209   return UsePerfData ?
1210     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1211 }
1212 
1213 jlong ClassLoader::class_verify_time_ms() {
1214   return UsePerfData ?
1215     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1216 }
1217 
1218 jlong ClassLoader::class_link_count() {
1219   return UsePerfData ? _perf_classes_linked->get_value() : -1;
1220 }
1221 
1222 jlong ClassLoader::class_link_time_ms() {
1223   return UsePerfData ?
1224     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1225 }
1226 
1227 int ClassLoader::compute_Object_vtable() {
1228   // hardwired for JDK1.2 -- would need to duplicate class file parsing
1229   // code to determine actual value from file
1230   // Would be value '11' if finals were in vtable
1231   int JDK_1_2_Object_vtable_size = 5;
1232   return JDK_1_2_Object_vtable_size * vtableEntry::size();
1233 }
1234 
1235 
1236 void classLoader_init() {
1237   ClassLoader::initialize();
1238 }
1239 
1240 
1241 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1242   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1243   if (CanonicalizeEntry != NULL) {
1244     JavaThread* THREAD = JavaThread::current();
1245     JNIEnv* env = THREAD->jni_environment();
1246     ResourceMark rm(THREAD);
1247 
1248     // os::native_path writes into orig_copy
1249     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1250     strcpy(orig_copy, orig);
1251     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1252       return false;
1253     }
1254   } else {
1255     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1256     strncpy(out, orig, len);
1257     out[len - 1] = '\0';
1258   }
1259   return true;
1260 }
1261 
1262 #ifndef PRODUCT
1263 
1264 void ClassLoader::verify() {
1265   _package_hash_table->verify();
1266 }
1267 
1268 
1269 // CompileTheWorld
1270 //
1271 // Iterates over all class path entries and forces compilation of all methods
1272 // in all classes found. Currently, only zip/jar archives are searched.
1273 //
1274 // The classes are loaded by the Java level bootstrap class loader, and the
1275 // initializer is called. If DelayCompilationDuringStartup is true (default),
1276 // the interpreter will run the initialization code. Note that forcing
1277 // initialization in this way could potentially lead to initialization order
1278 // problems, in which case we could just force the initialization bit to be set.
1279 
1280 
1281 // We need to iterate over the contents of a zip/jar file, so we replicate the
1282 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1283 // since jzfile already has a void* definition.
1284 //
1285 // Note that this is only used in debug mode.
1286 //
1287 // HotSpot integration note:
1288 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1289 
1290 
1291 // JDK 1.3 version
1292 typedef struct real_jzentry {         /* Zip file entry */
1293     char *name;                 /* entry name */
1294     jint time;                  /* modification time */
1295     jint size;                  /* size of uncompressed data */
1296     jint csize;                 /* size of compressed data (zero if uncompressed) */
1297     jint crc;                   /* crc of uncompressed data */
1298     char *comment;              /* optional zip file comment */
1299     jbyte *extra;               /* optional extra data */
1300     jint pos;                   /* position of LOC header (if negative) or data */
1301 } real_jzentry;
1302 
1303 typedef struct real_jzfile {  /* Zip file */
1304     char *name;                 /* zip file name */
1305     jint refs;                  /* number of active references */
1306     jint fd;                    /* open file descriptor */
1307     void *lock;                 /* read lock */
1308     char *comment;              /* zip file comment */
1309     char *msg;                  /* zip error message */
1310     void *entries;              /* array of hash cells */
1311     jint total;                 /* total number of entries */
1312     unsigned short *table;      /* Hash chain heads: indexes into entries */
1313     jint tablelen;              /* number of hash eads */
1314     real_jzfile *next;        /* next zip file in search list */
1315     jzentry *cache;             /* we cache the most recently freed jzentry */
1316     /* Information on metadata names in META-INF directory */
1317     char **metanames;           /* array of meta names (may have null names) */
1318     jint metacount;             /* number of slots in metanames array */
1319     /* If there are any per-entry comments, they are in the comments array */
1320     char **comments;
1321 } real_jzfile;
1322 
1323 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1324   // For now we only compile all methods in all classes in zip/jar files
1325   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1326   tty->cr();
1327 }
1328 
1329 bool ClassPathDirEntry::is_jrt() {
1330   return false;
1331 }
1332 
1333 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1334   real_jzfile* zip = (real_jzfile*) _zip;
1335   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1336   tty->cr();
1337   // Iterate over all entries in zip file
1338   for (int n = 0; ; n++) {
1339     real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1340     if (ze == NULL) break;
1341     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1342   }
1343   if (HAS_PENDING_EXCEPTION) {
1344     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1345       CLEAR_PENDING_EXCEPTION;
1346       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1347       tty->print_cr("Increase class metadata storage if a limit was set");
1348     } else {
1349       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1350     }
1351   }
1352 }
1353 
1354 bool ClassPathZipEntry::is_jrt() {
1355   return false;
1356 }
1357 
1358 void ClassLoader::compile_the_world() {
1359   EXCEPTION_MARK;
1360   HandleMark hm(THREAD);
1361   ResourceMark rm(THREAD);
1362   // Make sure we don't run with background compilation
1363   BackgroundCompilation = false;
1364   // Find bootstrap loader
1365   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1366   // Iterate over all bootstrap class path entries
1367   ClassPathEntry* e = _first_entry;
1368   jlong start = os::javaTimeMillis();
1369   while (e != NULL) {
1370     // We stop at bootmodules.jimage, unless it is the first bootstrap path entry
1371     if (e->is_jrt() && e != _first_entry) break;
1372     e->compile_the_world(system_class_loader, CATCH);
1373     e = e->next();
1374   }
1375   jlong end = os::javaTimeMillis();
1376   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1377                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1378   {
1379     // Print statistics as if before normal exit:
1380     extern void print_statistics();
1381     print_statistics();
1382   }
1383   vm_exit(0);
1384 }
1385 
1386 int ClassLoader::_compile_the_world_class_counter = 0;
1387 int ClassLoader::_compile_the_world_method_counter = 0;
1388 static int _codecache_sweep_counter = 0;
1389 
1390 // Filter out all exceptions except OOMs
1391 static void clear_pending_exception_if_not_oom(TRAPS) {
1392   if (HAS_PENDING_EXCEPTION &&
1393       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1394     CLEAR_PENDING_EXCEPTION;
1395   }
1396   // The CHECK at the caller will propagate the exception out
1397 }
1398 
1399 /**
1400  * Returns if the given method should be compiled when doing compile-the-world.
1401  *
1402  * TODO:  This should be a private method in a CompileTheWorld class.
1403  */
1404 static bool can_be_compiled(methodHandle m, int comp_level) {
1405   assert(CompileTheWorld, "must be");
1406 
1407   // It's not valid to compile a native wrapper for MethodHandle methods
1408   // that take a MemberName appendix since the bytecode signature is not
1409   // correct.
1410   vmIntrinsics::ID iid = m->intrinsic_id();
1411   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1412     return false;
1413   }
1414 
1415   return CompilationPolicy::can_be_compiled(m, comp_level);
1416 }
1417 
1418 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1419   if (string_ends_with(name, ".class")) {
1420     // We have a .class file
1421     int len = (int)strlen(name);
1422     char buffer[2048];
1423     strncpy(buffer, name, len - 6);
1424     buffer[len-6] = 0;
1425     // If the file has a period after removing .class, it's not really a
1426     // valid class file.  The class loader will check everything else.
1427     if (strchr(buffer, '.') == NULL) {
1428       _compile_the_world_class_counter++;
1429       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1430 
1431       // Construct name without extension
1432       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1433       // Use loader to load and initialize class
1434       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1435       instanceKlassHandle k (THREAD, ik);
1436       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1437         k->initialize(THREAD);
1438       }
1439       bool exception_occurred = HAS_PENDING_EXCEPTION;
1440       clear_pending_exception_if_not_oom(CHECK);
1441       if (CompileTheWorldPreloadClasses && k.not_null()) {
1442         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1443         if (HAS_PENDING_EXCEPTION) {
1444           // If something went wrong in preloading we just ignore it
1445           clear_pending_exception_if_not_oom(CHECK);
1446           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1447         }
1448       }
1449 
1450       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1451         if (k.is_null() || exception_occurred) {
1452           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1453           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1454         } else {
1455           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1456           // Preload all classes to get around uncommon traps
1457           // Iterate over all methods in class
1458           int comp_level = CompilationPolicy::policy()->initial_compile_level();
1459           for (int n = 0; n < k->methods()->length(); n++) {
1460             methodHandle m (THREAD, k->methods()->at(n));
1461             if (can_be_compiled(m, comp_level)) {
1462               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1463                 // Give sweeper a chance to keep up with CTW
1464                 VM_ForceSafepoint op;
1465                 VMThread::execute(&op);
1466                 _codecache_sweep_counter = 0;
1467               }
1468               // Force compilation
1469               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1470                                             methodHandle(), 0, "CTW", THREAD);
1471               if (HAS_PENDING_EXCEPTION) {
1472                 clear_pending_exception_if_not_oom(CHECK);
1473                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1474               } else {
1475                 _compile_the_world_method_counter++;
1476               }
1477               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1478                 // Clobber the first compile and force second tier compilation
1479                 nmethod* nm = m->code();
1480                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1481                   // Throw out the code so that the code cache doesn't fill up
1482                   nm->make_not_entrant();
1483                   m->clear_code();
1484                 }
1485                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1486                                               methodHandle(), 0, "CTW", THREAD);
1487                 if (HAS_PENDING_EXCEPTION) {
1488                   clear_pending_exception_if_not_oom(CHECK);
1489                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1490                 } else {
1491                   _compile_the_world_method_counter++;
1492                 }
1493               }
1494             } else {
1495               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1496             }
1497 
1498             nmethod* nm = m->code();
1499             if (nm != NULL && !m->is_method_handle_intrinsic()) {
1500               // Throw out the code so that the code cache doesn't fill up
1501               nm->make_not_entrant();
1502               m->clear_code();
1503             }
1504           }
1505         }
1506       }
1507     }
1508   }
1509 }
1510 
1511 #endif //PRODUCT
1512 
1513 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1514 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1515 void PerfClassTraceTime::initialize() {
1516   if (!UsePerfData) return;
1517 
1518   if (_eventp != NULL) {
1519     // increment the event counter
1520     _eventp->inc();
1521   }
1522 
1523   // stop the current active thread-local timer to measure inclusive time
1524   _prev_active_event = -1;
1525   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1526      if (_timers[i].is_active()) {
1527        assert(_prev_active_event == -1, "should have only one active timer");
1528        _prev_active_event = i;
1529        _timers[i].stop();
1530      }
1531   }
1532 
1533   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1534     // start the inclusive timer if not recursively called
1535     _t.start();
1536   }
1537 
1538   // start thread-local timer of the given event type
1539    if (!_timers[_event_type].is_active()) {
1540     _timers[_event_type].start();
1541   }
1542 }
1543 
1544 PerfClassTraceTime::~PerfClassTraceTime() {
1545   if (!UsePerfData) return;
1546 
1547   // stop the thread-local timer as the event completes
1548   // and resume the thread-local timer of the event next on the stack
1549   _timers[_event_type].stop();
1550   jlong selftime = _timers[_event_type].ticks();
1551 
1552   if (_prev_active_event >= 0) {
1553     _timers[_prev_active_event].start();
1554   }
1555 
1556   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1557 
1558   // increment the counters only on the leaf call
1559   _t.stop();
1560   _timep->inc(_t.ticks());
1561   if (_selftimep != NULL) {
1562     _selftimep->inc(selftime);
1563   }
1564   // add all class loading related event selftime to the accumulated time counter
1565   ClassLoader::perf_accumulated_time()->inc(selftime);
1566 
1567   // reset the timer
1568   _timers[_event_type].reset();
1569 }