jdk8-mips64-public/hotspot: src/share/vm/classfile/classLoader.cpp@b985cbb00e68 (annotated)

src/share/vm/classfile/classLoader.cpp@b985cbb00e68 (annotated)

src/share/vm/classfile/classLoader.cpp

Mon, 12 Aug 2019 18:30:40 +0300

author: apetushkov
date: Mon, 12 Aug 2019 18:30:40 +0300
changeset 9858: b985cbb00e68
parent 8717: 77d9c9da7188
child 9926: d20a5f399218
permissions: -rw-r--r--

8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens

 /*
  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/classFileParser.hpp"
 #include "classfile/classFileStream.hpp"
 #include "classfile/classLoader.hpp"
 #include "classfile/classLoaderExt.hpp"
 #include "classfile/classLoaderData.inline.hpp"
 #include "classfile/javaClasses.hpp"
 #if INCLUDE_CDS
 #include "classfile/sharedPathsMiscInfo.hpp"
 #include "classfile/sharedClassUtil.hpp"
 #endif
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/filemap.hpp"
 #include "memory/generation.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceRefKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/symbol.hpp"
 #include "prims/jvm_misc.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/init.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/java.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/threadCritical.hpp"
 #include "runtime/timer.hpp"
 #include "services/management.hpp"
 #include "services/threadService.hpp"
 #include "utilities/events.hpp"
 #include "utilities/hashtable.hpp"
 #include "utilities/hashtable.inline.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_aix
 # include "os_aix.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_bsd.inline.hpp"
 #endif
 // Entry points in zip.dll for loading zip/jar file entries
 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
 typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
 static ZipOpen_t         ZipOpen            = NULL;
 static ZipClose_t        ZipClose           = NULL;
 static FindEntry_t       FindEntry          = NULL;
 static ReadEntry_t       ReadEntry          = NULL;
 static ReadMappedEntry_t ReadMappedEntry    = NULL;
 static GetNextEntry_t    GetNextEntry       = NULL;
 static canonicalize_fn_t CanonicalizeEntry  = NULL;
 static Crc32_t           Crc32              = NULL;
 // Globals
 PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
 PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
 PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
 PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
 PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
 PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
 PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
 PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
 PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
 PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
 PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
 PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
 PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
 PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
 PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
 PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
 PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
 PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
 PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
 PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
 PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
 PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
 PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
 PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 ClassPathEntry* ClassLoader::_last_entry          = NULL;
 int             ClassLoader::_num_entries         = 0;
 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 #if INCLUDE_CDS
 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
 #endif
 // helper routines
 bool string_starts_with(const char* str, const char* str_to_find) {
   size_t str_len = strlen(str);
   size_t str_to_find_len = strlen(str_to_find);
   if (str_to_find_len > str_len) {
     return false;
   }
   return (strncmp(str, str_to_find, str_to_find_len) == 0);
 }
 bool string_ends_with(const char* str, const char* str_to_find) {
   size_t str_len = strlen(str);
   size_t str_to_find_len = strlen(str_to_find);
   if (str_to_find_len > str_len) {
     return false;
   }
   return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
 }
 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
   if (num_meta_package_names == 0) {
     _meta_package_names = NULL;
     _num_meta_package_names = 0;
   } else {
     _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
     _num_meta_package_names = num_meta_package_names;
     memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
   }
 }
 MetaIndex::~MetaIndex() {
   FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
 }
 bool MetaIndex::may_contain(const char* class_name) {
   if ( _num_meta_package_names == 0) {
     return false;
   }
   size_t class_name_len = strlen(class_name);
   for (int i = 0; i < _num_meta_package_names; i++) {
     char* pkg = _meta_package_names[i];
     size_t pkg_len = strlen(pkg);
     size_t min_len = MIN2(class_name_len, pkg_len);
     if (!strncmp(class_name, pkg, min_len)) {
       return true;
     }
   }
   return false;
 }
 ClassPathEntry::ClassPathEntry() {
   set_next(NULL);
 }
 bool ClassPathEntry::is_lazy() {
   return false;
 }
 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
   char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
   strcpy(copy, dir);
   _dir = copy;
 }
 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
   // construct full path name
   char path[JVM_MAXPATHLEN];
   if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
     return NULL;
   }
   // check if file exists
   struct stat st;
   if (os::stat(path, &st) == 0) {
 #if INCLUDE_CDS
     if (DumpSharedSpaces) {
       // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
       // we should never find a file underneath it -- unless user has added a new file while we are running
       // the dump, in which case let's quit!
       ShouldNotReachHere();
     }
 #endif
     // found file, open it
     int file_handle = os::open(path, 0, 0);
     if (file_handle != -1) {
       // read contents into resource array
       u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
       size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
       // close file
       os::close(file_handle);
       // construct ClassFileStream
       if (num_read == (size_t)st.st_size) {
         if (UsePerfData) {
           ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
         }
         return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
       }
     }
   }
   return NULL;
 }
 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
   _zip = zip;
   char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
   strcpy(copy, zip_name);
   _zip_name = copy;
 }
 ClassPathZipEntry::~ClassPathZipEntry() {
   if (ZipClose != NULL) {
     (*ZipClose)(_zip);
   }
   FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
 }
 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
     // enable call to C land
   JavaThread* thread = JavaThread::current();
   ThreadToNativeFromVM ttn(thread);
   // check whether zip archive contains name
   jint name_len;
   jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
   if (entry == NULL) return NULL;
   u1* buffer;
   char name_buf[128];
   char* filename;
   if (name_len < 128) {
     filename = name_buf;
   } else {
     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
   }
   // file found, get pointer to the entry in mmapped jar file.
   if (ReadMappedEntry == NULL ||
       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
       // mmapped access not available, perhaps due to compression,
       // read contents into resource array
       int size = (*filesize) + ((nul_terminate) ? 1 : 0);
       buffer = NEW_RESOURCE_ARRAY(u1, size);
       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
   }
   // return result
   if (nul_terminate) {
     buffer[*filesize] = 0;
   }
   return buffer;
 }
 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
   jint filesize;
   u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
   if (buffer == NULL) {
     return NULL;
   }
   if (UsePerfData) {
     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
   }
   return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
 }
 // invoke function for each entry in the zip file
 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
   JavaThread* thread = JavaThread::current();
   HandleMark  handle_mark(thread);
   ThreadToNativeFromVM ttn(thread);
   for (int n = 0; ; n++) {
     jzentry * ze = ((*GetNextEntry)(_zip, n));
     if (ze == NULL) break;
     (*f)(ze->name, context);
   }
 }
 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
   _path = strdup(path);
   _st = *st;
   _meta_index = NULL;
   _resolved_entry = NULL;
   _has_error = false;
   _throw_exception = throw_exception;
 }
 bool LazyClassPathEntry::is_jar_file() {
   return ((_st.st_mode & S_IFREG) == S_IFREG);
 }
 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
   if (_resolved_entry != NULL) {
     return (ClassPathEntry*) _resolved_entry;
   }
   ClassPathEntry* new_entry = NULL;
   new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
   if (!_throw_exception && new_entry == NULL) {
     assert(!HAS_PENDING_EXCEPTION, "must be");
     return NULL;
   }
   {
     ThreadCritical tc;
     if (_resolved_entry == NULL) {
       _resolved_entry = new_entry;
       return new_entry;
     }
   }
   assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
   delete new_entry;
   return (ClassPathEntry*) _resolved_entry;
 }
 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
   if (_meta_index != NULL &&
       !_meta_index->may_contain(name)) {
     return NULL;
   }
   if (_has_error) {
     return NULL;
   }
   ClassPathEntry* cpe = resolve_entry(THREAD);
   if (cpe == NULL) {
     _has_error = true;
     return NULL;
   } else {
     return cpe->open_stream(name, THREAD);
   }
 }
 bool LazyClassPathEntry::is_lazy() {
   return true;
 }
 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
   if (_has_error) {
     return NULL;
   }
   ClassPathEntry* cpe = resolve_entry(THREAD);
   if (cpe == NULL) {
     _has_error = true;
     return NULL;
   } else if (cpe->is_jar_file()) {
     return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
   } else {
     ShouldNotReachHere();
     *filesize = 0;
     return NULL;
   }
 }
 static void print_meta_index(LazyClassPathEntry* entry,
                              GrowableArray<char*>& meta_packages) {
   tty->print("[Meta index for %s=", entry->name());
   for (int i = 0; i < meta_packages.length(); i++) {
     if (i > 0) tty->print(" ");
     tty->print("%s", meta_packages.at(i));
   }
   tty->print_cr("]");
 }
 #if INCLUDE_CDS
 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
   assert(DumpSharedSpaces, "only called at dump time");
   tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
   vm_exit_during_initialization(error, message);
 }
 #endif
 void ClassLoader::trace_class_path(outputStream* out, const char* msg, const char* name) {
   if (!TraceClassPaths) {
     return;
   }
   if (msg) {
     out->print("%s", msg);
   }
   if (name) {
     if (strlen(name) < 256) {
       out->print("%s", name);
     } else {
       // For very long paths, we need to print each character separately,
       // as print_cr() has a length limit
       while (name[0] != '\0') {
         out->print("%c", name[0]);
         name++;
       }
     }
   }
   if (msg && msg[0] == '[') {
     out->print_cr("]");
   } else {
     out->cr();
   }
 }
 void ClassLoader::setup_bootstrap_meta_index() {
   // Set up meta index which allows us to open boot jars lazily if
   // class data sharing is enabled
   const char* meta_index_path = Arguments::get_meta_index_path();
   const char* meta_index_dir  = Arguments::get_meta_index_dir();
   setup_meta_index(meta_index_path, meta_index_dir, 0);
 }
 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
   const char* known_version = "% VERSION 2";
   FILE* file = fopen(meta_index_path, "r");
   int line_no = 0;
 #if INCLUDE_CDS
   if (DumpSharedSpaces) {
     if (file != NULL) {
       _shared_paths_misc_info->add_required_file(meta_index_path);
     } else {
       _shared_paths_misc_info->add_nonexist_path(meta_index_path);
     }
   }
 #endif
   if (file != NULL) {
     ResourceMark rm;
     LazyClassPathEntry* cur_entry = NULL;
     GrowableArray<char*> boot_class_path_packages(10);
     char package_name[256];
     bool skipCurrentJar = false;
     while (fgets(package_name, sizeof(package_name), file) != NULL) {
       ++line_no;
       // Remove trailing newline
       package_name[strlen(package_name) - 1] = '\0';
       switch(package_name[0]) {
         case '%':
         {
           if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
             if (TraceClassLoading && Verbose) {
               tty->print("[Unsupported meta index version]");
             }
             fclose(file);
             return;
           }
         }
         // These directives indicate jar files which contain only
         // classes, only non-classfile resources, or a combination of
         // the two. See src/share/classes/sun/misc/MetaIndex.java and
         // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
         // workspace.
         case '#':
         case '!':
         case '@':
         {
           // Hand off current packages to current lazy entry (if any)
           if ((cur_entry != NULL) &&
               (boot_class_path_packages.length() > 0)) {
             if ((TraceClassLoading || TraceClassPaths) && Verbose) {
               print_meta_index(cur_entry, boot_class_path_packages);
             }
             MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
                                              boot_class_path_packages.length());
             cur_entry->set_meta_index(index);
           }
           cur_entry = NULL;
           boot_class_path_packages.clear();
           // Find lazy entry corresponding to this jar file
           int count = 0;
           for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
             if (count >= start_index &&
                 entry->is_lazy() &&
                 string_starts_with(entry->name(), meta_index_dir) &&
                 string_ends_with(entry->name(), &package_name[2])) {
               cur_entry = (LazyClassPathEntry*) entry;
               break;
             }
           }
           // If the first character is '@', it indicates the following jar
           // file is a resource only jar file in which case, we should skip
           // reading the subsequent entries since the resource loading is
           // totally handled by J2SE side.
           if (package_name[0] == '@') {
             if (cur_entry != NULL) {
               cur_entry->set_meta_index(new MetaIndex(NULL, 0));
             }
             cur_entry = NULL;
             skipCurrentJar = true;
           } else {
             skipCurrentJar = false;
           }
           break;
         }
         default:
         {
           if (!skipCurrentJar && cur_entry != NULL) {
             char* new_name = strdup(package_name);
             boot_class_path_packages.append(new_name);
           }
         }
       }
     }
     // Hand off current packages to current lazy entry (if any)
     if ((cur_entry != NULL) &&
         (boot_class_path_packages.length() > 0)) {
       if ((TraceClassLoading || TraceClassPaths) && Verbose) {
         print_meta_index(cur_entry, boot_class_path_packages);
       }
       MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
                                        boot_class_path_packages.length());
       cur_entry->set_meta_index(index);
     }
     fclose(file);
   }
 }
 #if INCLUDE_CDS
 void ClassLoader::check_shared_classpath(const char *path) {
   if (strcmp(path, "") == 0) {
     exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
   }
   struct stat st;
   if (os::stat(path, &st) == 0) {
     if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
       if (!os::dir_is_empty(path)) {
         tty->print_cr("Error: non-empty directory '%s'", path);
         exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
       }
     }
   }
 }
 #endif
 void ClassLoader::setup_bootstrap_search_path() {
   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
   const char* sys_class_path = Arguments::get_sysclasspath();
   if (PrintSharedArchiveAndExit) {
     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
     // the same as the bootcp of the shared archive.
   } else {
     trace_class_path(tty, "[Bootstrap loader class path=", sys_class_path);
   }
 #if INCLUDE_CDS
   if (DumpSharedSpaces) {
     _shared_paths_misc_info->add_boot_classpath(sys_class_path);
   }
 #endif
   setup_search_path(sys_class_path);
 }
 #if INCLUDE_CDS
 int ClassLoader::get_shared_paths_misc_info_size() {
   return _shared_paths_misc_info->get_used_bytes();
 }
 void* ClassLoader::get_shared_paths_misc_info() {
   return _shared_paths_misc_info->buffer();
 }
 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
   SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
   bool result = checker->check();
   delete checker;
   return result;
 }
 #endif
 void ClassLoader::setup_search_path(const char *class_path, bool canonicalize) {
   int offset = 0;
   int len = (int)strlen(class_path);
   int end = 0;
   // Iterate over class path entries
   for (int start = 0; start < len; start = end) {
     while (class_path[end] && class_path[end] != os::path_separator()[0]) {
       end++;
     }
     EXCEPTION_MARK;
     ResourceMark rm(THREAD);
     char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
     strncpy(path, &class_path[start], end - start);
     path[end - start] = '\0';
     if (canonicalize) {
       char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN + 1);
       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
         path = canonical_path;
       }
     }
     update_class_path_entry_list(path, /*check_for_duplicates=*/canonicalize);
 #if INCLUDE_CDS
     if (DumpSharedSpaces) {
       check_shared_classpath(path);
     }
 #endif
     while (class_path[end] == os::path_separator()[0]) {
       end++;
     }
   }
 }
 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
                                                      bool lazy, bool throw_exception, TRAPS) {
   JavaThread* thread = JavaThread::current();
   if (lazy) {
     return new LazyClassPathEntry(path, st, throw_exception);
   }
   ClassPathEntry* new_entry = NULL;
   if ((st->st_mode & S_IFREG) == S_IFREG) {
     // Regular file, should be a zip file
     // Canonicalized filename
     char canonical_path[JVM_MAXPATHLEN];
     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
       // This matches the classic VM
       if (throw_exception) {
         THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
       } else {
         return NULL;
       }
     }
     char* error_msg = NULL;
     jzfile* zip;
     {
       // enable call to C land
       ThreadToNativeFromVM ttn(thread);
       HandleMark hm(thread);
       zip = (*ZipOpen)(canonical_path, &error_msg);
     }
     if (zip != NULL && error_msg == NULL) {
       new_entry = new ClassPathZipEntry(zip, path);
       if (TraceClassLoading || TraceClassPaths) {
         tty->print_cr("[Opened %s]", path);
       }
     } else {
       ResourceMark rm(thread);
       char *msg;
       if (error_msg == NULL) {
         msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
         jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
       } else {
         int len = (int)(strlen(path) + strlen(error_msg) + 128);
         msg = NEW_RESOURCE_ARRAY(char, len); ;
         jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
       }
       if (throw_exception) {
         THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
       } else {
         return NULL;
       }
     }
   } else {
     // Directory
     new_entry = new ClassPathDirEntry(path);
     if (TraceClassLoading || TraceClassPaths) {
       tty->print_cr("[Path %s]", path);
     }
   }
   return new_entry;
 }
 // Create a class path zip entry for a given path (return NULL if not found
 // or zip/JAR file cannot be opened)
 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
   // check for a regular file
   struct stat st;
   if (os::stat(path, &st) == 0) {
     if ((st.st_mode & S_IFREG) == S_IFREG) {
       char canonical_path[JVM_MAXPATHLEN];
       if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
         char* error_msg = NULL;
         jzfile* zip;
         {
           // enable call to C land
           JavaThread* thread = JavaThread::current();
           ThreadToNativeFromVM ttn(thread);
           HandleMark hm(thread);
           zip = (*ZipOpen)(canonical_path, &error_msg);
         }
         if (zip != NULL && error_msg == NULL) {
           // create using canonical path
           return new ClassPathZipEntry(zip, canonical_path);
         }
       }
     }
   }
   return NULL;
 }
 // returns true if entry already on class path
 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
   ClassPathEntry* e = _first_entry;
   while (e != NULL) {
     // assume zip entries have been canonicalized
     if (strcmp(entry->name(), e->name()) == 0) {
       return true;
     }
     e = e->next();
   }
   return false;
 }
 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
   if (new_entry != NULL) {
     if (_last_entry == NULL) {
       _first_entry = _last_entry = new_entry;
     } else {
       _last_entry->set_next(new_entry);
       _last_entry = new_entry;
     }
   }
   _num_entries ++;
 }
 // Returns true IFF the file/dir exists and the entry was successfully created.
 bool ClassLoader::update_class_path_entry_list(const char *path,
                                                bool check_for_duplicates,
                                                bool throw_exception) {
   struct stat st;
   if (os::stat(path, &st) == 0) {
     // File or directory found
     ClassPathEntry* new_entry = NULL;
     Thread* THREAD = Thread::current();
     new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
     if (new_entry == NULL) {
       return false;
     }
     // The kernel VM adds dynamically to the end of the classloader path and
     // doesn't reorder the bootclasspath which would break java.lang.Package
     // (see PackageInfo).
     // Add new entry to linked list
     if (!check_for_duplicates || !contains_entry(new_entry)) {
       ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
     }
     return true;
   } else {
 #if INCLUDE_CDS
     if (DumpSharedSpaces) {
       _shared_paths_misc_info->add_nonexist_path(path);
     }
 #endif
     return false;
   }
 }
 void ClassLoader::print_bootclasspath() {
   ClassPathEntry* e = _first_entry;
   tty->print("[bootclasspath= ");
   while (e != NULL) {
     tty->print("%s ;", e->name());
     e = e->next();
   }
   tty->print_cr("]");
 }
 void ClassLoader::load_zip_library() {
   assert(ZipOpen == NULL, "should not load zip library twice");
   // First make sure native library is loaded
   os::native_java_library();
   // Load zip library
   char path[JVM_MAXPATHLEN];
   char ebuf[1024];
   void* handle = NULL;
   if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
     handle = os::dll_load(path, ebuf, sizeof ebuf);
   }
   if (handle == NULL) {
     vm_exit_during_initialization("Unable to load ZIP library", path);
   }
   // Lookup zip entry points
   ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
   ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
   FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
   ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
   ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
   GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
   Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
   // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
   if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
       GetNextEntry == NULL || Crc32 == NULL) {
     vm_exit_during_initialization("Corrupted ZIP library", path);
   }
   // Lookup canonicalize entry in libjava.dll
   void *javalib_handle = os::native_java_library();
   CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
   // This lookup only works on 1.3. Do not check for non-null here
 }
 int ClassLoader::crc32(int crc, const char* buf, int len) {
   assert(Crc32 != NULL, "ZIP_CRC32 is not found");
   return (*Crc32)(crc, (const jbyte*)buf, len);
 }
 // PackageInfo data exists in order to support the java.lang.Package
 // class.  A Package object provides information about a java package
 // (version, vendor, etc.) which originates in the manifest of the jar
 // file supplying the package.  For application classes, the ClassLoader
 // object takes care of this.
 // For system (boot) classes, the Java code in the Package class needs
 // to be able to identify which source jar file contained the boot
 // class, so that it can extract the manifest from it.  This table
 // identifies java packages with jar files in the boot classpath.
 // Because the boot classpath cannot change, the classpath index is
 // sufficient to identify the source jar file or directory.  (Since
 // directories have no manifests, the directory name is not required,
 // but is available.)
 // When using sharing -- the pathnames of entries in the boot classpath
 // may not be the same at runtime as they were when the archive was
 // created (NFS, Samba, etc.).  The actual files and directories named
 // in the classpath must be the same files, in the same order, even
 // though the exact name is not the same.
 class PackageInfo: public BasicHashtableEntry<mtClass> {
 public:
   const char* _pkgname;       // Package name
   int _classpath_index;       // Index of directory or JAR file loaded from
   PackageInfo* next() {
     return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
   }
   const char* pkgname()           { return _pkgname; }
   void set_pkgname(char* pkgname) { _pkgname = pkgname; }
   const char* filename() {
     return ClassLoader::classpath_entry(_classpath_index)->name();
   }
   void set_index(int index) {
     _classpath_index = index;
   }
 };
 class PackageHashtable : public BasicHashtable<mtClass> {
 private:
   inline unsigned int compute_hash(const char *s, int n) {
     unsigned int val = 0;
     while (--n >= 0) {
       val = *s++ + 31 * val;
     }
     return val;
   }
   PackageInfo* bucket(int index) {
     return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
   }
   PackageInfo* get_entry(int index, unsigned int hash,
                          const char* pkgname, size_t n) {
     for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
       if (pp->hash() == hash &&
           strncmp(pkgname, pp->pkgname(), n) == 0 &&
           pp->pkgname()[n] == '\0') {
         return pp;
       }
     }
     return NULL;
   }
 public:
   PackageHashtable(int table_size)
     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
   PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
     : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
   PackageInfo* get_entry(const char* pkgname, int n) {
     unsigned int hash = compute_hash(pkgname, n);
     return get_entry(hash_to_index(hash), hash, pkgname, n);
   }
   PackageInfo* new_entry(char* pkgname, int n) {
     unsigned int hash = compute_hash(pkgname, n);
     PackageInfo* pp;
     pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
     pp->set_pkgname(pkgname);
     return pp;
   }
   void add_entry(PackageInfo* pp) {
     int index = hash_to_index(pp->hash());
     BasicHashtable<mtClass>::add_entry(index, pp);
   }
   void copy_pkgnames(const char** packages) {
     int n = 0;
     for (int i = 0; i < table_size(); ++i) {
       for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
         packages[n++] = pp->pkgname();
       }
     }
     assert(n == number_of_entries(), "just checking");
   }
   CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
 };
 #if INCLUDE_CDS
 void PackageHashtable::copy_table(char** top, char* end,
                                   PackageHashtable* table) {
   // Copy (relocate) the table to the shared space.
   BasicHashtable<mtClass>::copy_table(top, end);
   // Calculate the space needed for the package name strings.
   int i;
   intptr_t* tableSize = (intptr_t*)(*top);
   *top += sizeof(intptr_t);  // For table size
   char* tableStart = *top;
   for (i = 0; i < table_size(); ++i) {
     for (PackageInfo* pp = table->bucket(i);
                       pp != NULL;
                       pp = pp->next()) {
       int n1 = (int)(strlen(pp->pkgname()) + 1);
       if (*top + n1 >= end) {
         report_out_of_shared_space(SharedMiscData);
       }
       pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
       *top += n1;
     }
   }
   *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
   if (*top >= end) {
     report_out_of_shared_space(SharedMiscData);
   }
   // Write table size
   intptr_t len = *top - (char*)tableStart;
   *tableSize = len;
 }
 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
   _package_hash_table->copy_buckets(top, end);
 }
 void ClassLoader::copy_package_info_table(char** top, char* end) {
   _package_hash_table->copy_table(top, end, _package_hash_table);
 }
 #endif
 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
   const char *cp = strrchr(pkgname, '/');
   if (cp != NULL) {
     // Package prefix found
     int n = cp - pkgname + 1;
     return _package_hash_table->get_entry(pkgname, n);
   }
   return NULL;
 }
 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
   assert(pkgname != NULL, "just checking");
   // Bootstrap loader no longer holds system loader lock obj serializing
   // load_instance_class and thereby add_package
   {
     MutexLocker ml(PackageTable_lock, THREAD);
     // First check for previously loaded entry
     PackageInfo* pp = lookup_package(pkgname);
     if (pp != NULL) {
       // Existing entry found, check source of package
       pp->set_index(classpath_index);
       return true;
     }
     const char *cp = strrchr(pkgname, '/');
     if (cp != NULL) {
       // Package prefix found
       int n = cp - pkgname + 1;
       char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
       if (new_pkgname == NULL) {
         return false;
       }
       memcpy(new_pkgname, pkgname, n);
       new_pkgname[n] = '\0';
       pp = _package_hash_table->new_entry(new_pkgname, n);
       pp->set_index(classpath_index);
       // Insert into hash table
       _package_hash_table->add_entry(pp);
     }
     return true;
   }
 }
 oop ClassLoader::get_system_package(const char* name, TRAPS) {
   PackageInfo* pp;
   {
     MutexLocker ml(PackageTable_lock, THREAD);
     pp = lookup_package(name);
   }
   if (pp == NULL) {
     return NULL;
   } else {
     Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
     return p();
   }
 }
 objArrayOop ClassLoader::get_system_packages(TRAPS) {
   ResourceMark rm(THREAD);
   int nof_entries;
   const char** packages;
   {
     MutexLocker ml(PackageTable_lock, THREAD);
     // Allocate resource char* array containing package names
     nof_entries = _package_hash_table->number_of_entries();
     if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
       return NULL;
     }
     _package_hash_table->copy_pkgnames(packages);
   }
   // Allocate objArray and fill with java.lang.String
   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
                                            nof_entries, CHECK_0);
   objArrayHandle result(THREAD, r);
   for (int i = 0; i < nof_entries; i++) {
     Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
     result->obj_at_put(i, str());
   }
   return result();
 }
 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
   ResourceMark rm(THREAD);
   const char* class_name = h_name->as_C_string();
   EventMark m("loading class %s", class_name);
   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
   stringStream st;
   // st.print() uses too much stack space while handling a StackOverflowError
   // st.print("%s.class", h_name->as_utf8());
   st.print_raw(h_name->as_utf8());
   st.print_raw(".class");
   const char* file_name = st.as_string();
   ClassLoaderExt::Context context(class_name, file_name, THREAD);
   // Lookup stream for parsing .class file
   ClassFileStream* stream = NULL;
   int classpath_index = 0;
   ClassPathEntry* e = NULL;
   instanceKlassHandle h;
   {
     PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
                                ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
                                PerfClassTraceTime::CLASS_LOAD);
     e = _first_entry;
     while (e != NULL) {
       stream = e->open_stream(file_name, CHECK_NULL);
       if (!context.check(stream, classpath_index)) {
         return h; // NULL
       }
       if (stream != NULL) {
         break;
       }
       e = e->next();
       ++classpath_index;
     }
   }
   if (stream != NULL) {
     // class file found, parse it
     ClassFileParser parser(stream);
     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
     Handle protection_domain;
     TempNewSymbol parsed_name = NULL;
     instanceKlassHandle result = parser.parseClassFile(h_name,
                                                        loader_data,
                                                        protection_domain,
                                                        parsed_name,
                                                        context.should_verify(classpath_index),
                                                        THREAD);
     if (HAS_PENDING_EXCEPTION) {
       ResourceMark rm;
       if (DumpSharedSpaces) {
         tty->print_cr("Preload Error: Failed to load %s", class_name);
       }
       return h;
     }
 #if INCLUDE_JFR
   {
     InstanceKlass* ik = result();
     ON_KLASS_CREATION(ik, parser, THREAD);
     result = instanceKlassHandle(ik);
   }
 #endif
     h = context.record_result(classpath_index, e, result, THREAD);
   } else {
     if (DumpSharedSpaces) {
       tty->print_cr("Preload Warning: Cannot find %s", class_name);
     }
   }
   return h;
 }
 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
                                             int number_of_entries) {
   assert(_package_hash_table == NULL, "One package info table allowed.");
   assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
          "bad shared package info size.");
   _package_hash_table = new PackageHashtable(package_hash_table_size, t,
                                              number_of_entries);
 }
 void ClassLoader::create_package_info_table() {
     assert(_package_hash_table == NULL, "shouldn't have one yet");
     _package_hash_table = new PackageHashtable(package_hash_table_size);
 }
 // Initialize the class loader's access to methods in libzip.  Parse and
 // process the boot classpath into a list ClassPathEntry objects.  Once
 // this list has been created, it must not change order (see class PackageInfo)
 // it can be appended to and is by jvmti and the kernel vm.
 void ClassLoader::initialize() {
   assert(_package_hash_table == NULL, "should have been initialized by now.");
   EXCEPTION_MARK;
   if (UsePerfData) {
     // jvmstat performance counters
     NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
     NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
     NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
     NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
     NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
     NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
     NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
     NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
     NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
     NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
     NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
     NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
     NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
     NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
     NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
     NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
     NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
     NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
     NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
     NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
     NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
     NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
     NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
     // The following performance counters are added for measuring the impact
     // of the bug fix of 6365597. They are mainly focused on finding out
     // the behavior of system & user-defined classloader lock, whether
     // ClassLoader.loadClass/findClass is being called synchronized or not.
     // Also two additional counters are created to see whether 'UnsyncloadClass'
     // flag is being set or not and how many times load_instance_class call
     // fails with linkageError etc.
     NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
                         "systemLoaderLockContentionRate");
     NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
                         "nonSystemLoaderLockContentionRate");
     NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
                         "jvmFindLoadedClassNoLockCalls");
     NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
                         "jvmDefineClassNoLockCalls");
     NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
                         "jniDefineClassNoLockCalls");
     NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
                         "unsafeDefineClassCalls");
     NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
     NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
                         "loadInstanceClassFailRate");
     // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
     if (UnsyncloadClass) {
       _isUnsyncloadClass->inc();
     }
   }
   // lookup zip library entry points
   load_zip_library();
 #if INCLUDE_CDS
   // initialize search path
   if (DumpSharedSpaces) {
     _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
   }
 #endif
   setup_bootstrap_search_path();
   if (LazyBootClassLoader) {
     // set up meta index which makes boot classpath initialization lazier
     setup_bootstrap_meta_index();
   }
 }
 #if INCLUDE_CDS
 void ClassLoader::initialize_shared_path() {
   if (DumpSharedSpaces) {
     ClassLoaderExt::setup_search_paths();
     _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
   }
 }
 #endif
 jlong ClassLoader::classloader_time_ms() {
   return UsePerfData ?
     Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
 }
 jlong ClassLoader::class_init_count() {
   return UsePerfData ? _perf_classes_inited->get_value() : -1;
 }
 jlong ClassLoader::class_init_time_ms() {
   return UsePerfData ?
     Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
 }
 jlong ClassLoader::class_verify_time_ms() {
   return UsePerfData ?
     Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
 }
 jlong ClassLoader::class_link_count() {
   return UsePerfData ? _perf_classes_linked->get_value() : -1;
 }
 jlong ClassLoader::class_link_time_ms() {
   return UsePerfData ?
     Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
 }
 int ClassLoader::compute_Object_vtable() {
   // hardwired for JDK1.2 -- would need to duplicate class file parsing
   // code to determine actual value from file
   // Would be value '11' if finals were in vtable
   int JDK_1_2_Object_vtable_size = 5;
   return JDK_1_2_Object_vtable_size * vtableEntry::size();
 }
 void classLoader_init() {
   ClassLoader::initialize();
 }
 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
   if (CanonicalizeEntry != NULL) {
     JavaThread* THREAD = JavaThread::current();
     JNIEnv* env = THREAD->jni_environment();
     ResourceMark rm(THREAD);
     // os::native_path writes into orig_copy
     char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
     strcpy(orig_copy, orig);
     if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
       return false;
     }
   } else {
     // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
     strncpy(out, orig, len);
     out[len - 1] = '\0';
   }
   return true;
 }
 #ifndef PRODUCT
 void ClassLoader::verify() {
   _package_hash_table->verify();
 }
 // CompileTheWorld
 //
 // Iterates over all class path entries and forces compilation of all methods
 // in all classes found. Currently, only zip/jar archives are searched.
 //
 // The classes are loaded by the Java level bootstrap class loader, and the
 // initializer is called. If DelayCompilationDuringStartup is true (default),
 // the interpreter will run the initialization code. Note that forcing
 // initialization in this way could potentially lead to initialization order
 // problems, in which case we could just force the initialization bit to be set.
 // We need to iterate over the contents of a zip/jar file, so we replicate the
 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
 // since jzfile already has a void* definition.
 //
 // Note that this is only used in debug mode.
 //
 // HotSpot integration note:
 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
 // JDK 1.3 version
 typedef struct real_jzentry13 {         /* Zip file entry */
     char *name;                 /* entry name */
     jint time;                  /* modification time */
     jint size;                  /* size of uncompressed data */
     jint csize;                 /* size of compressed data (zero if uncompressed) */
     jint crc;                   /* crc of uncompressed data */
     char *comment;              /* optional zip file comment */
     jbyte *extra;               /* optional extra data */
     jint pos;                   /* position of LOC header (if negative) or data */
 } real_jzentry13;
 typedef struct real_jzfile13 {  /* Zip file */
     char *name;                 /* zip file name */
     jint refs;                  /* number of active references */
     jint fd;                    /* open file descriptor */
     void *lock;                 /* read lock */
     char *comment;              /* zip file comment */
     char *msg;                  /* zip error message */
     void *entries;              /* array of hash cells */
     jint total;                 /* total number of entries */
     unsigned short *table;      /* Hash chain heads: indexes into entries */
     jint tablelen;              /* number of hash eads */
     real_jzfile13 *next;        /* next zip file in search list */
     jzentry *cache;             /* we cache the most recently freed jzentry */
     /* Information on metadata names in META-INF directory */
     char **metanames;           /* array of meta names (may have null names) */
     jint metacount;             /* number of slots in metanames array */
     /* If there are any per-entry comments, they are in the comments array */
     char **comments;
 } real_jzfile13;
 // JDK 1.2 version
 typedef struct real_jzentry12 {  /* Zip file entry */
     char *name;                  /* entry name */
     jint time;                   /* modification time */
     jint size;                   /* size of uncompressed data */
     jint csize;                  /* size of compressed data (zero if uncompressed) */
     jint crc;                    /* crc of uncompressed data */
     char *comment;               /* optional zip file comment */
     jbyte *extra;                /* optional extra data */
     jint pos;                    /* position of LOC header (if negative) or data */
     struct real_jzentry12 *next; /* next entry in hash table */
 } real_jzentry12;
 typedef struct real_jzfile12 {  /* Zip file */
     char *name;                 /* zip file name */
     jint refs;                  /* number of active references */
     jint fd;                    /* open file descriptor */
     void *lock;                 /* read lock */
     char *comment;              /* zip file comment */
     char *msg;                  /* zip error message */
     real_jzentry12 *entries;    /* array of zip entries */
     jint total;                 /* total number of entries */
     real_jzentry12 **table;     /* hash table of entries */
     jint tablelen;              /* number of buckets */
     jzfile *next;               /* next zip file in search list */
 } real_jzfile12;
 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
   // For now we only compile all methods in all classes in zip/jar files
   tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
   tty->cr();
 }
 bool ClassPathDirEntry::is_rt_jar() {
   return false;
 }
 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
   if (JDK_Version::is_jdk12x_version()) {
     compile_the_world12(loader, THREAD);
   } else {
     compile_the_world13(loader, THREAD);
   }
   if (HAS_PENDING_EXCEPTION) {
     if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
       CLEAR_PENDING_EXCEPTION;
       tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
       tty->print_cr("Increase class metadata storage if a limit was set");
     } else {
       tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
     }
   }
 }
 // Version that works for JDK 1.3.x
 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
   real_jzfile13* zip = (real_jzfile13*) _zip;
   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
   tty->cr();
   // Iterate over all entries in zip file
   for (int n = 0; ; n++) {
     real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
     if (ze == NULL) break;
     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
   }
 }
 // Version that works for JDK 1.2.x
 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
   real_jzfile12* zip = (real_jzfile12*) _zip;
   tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
   tty->cr();
   // Iterate over all entries in zip file
   for (int n = 0; ; n++) {
     real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
     if (ze == NULL) break;
     ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
   }
 }
 bool ClassPathZipEntry::is_rt_jar() {
   if (JDK_Version::is_jdk12x_version()) {
     return is_rt_jar12();
   } else {
     return is_rt_jar13();
   }
 }
 // JDK 1.3 version
 bool ClassPathZipEntry::is_rt_jar13() {
   real_jzfile13* zip = (real_jzfile13*) _zip;
   int len = (int)strlen(zip->name);
   // Check whether zip name ends in "rt.jar"
   // This will match other archives named rt.jar as well, but this is
   // only used for debugging.
   return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
 }
 // JDK 1.2 version
 bool ClassPathZipEntry::is_rt_jar12() {
   real_jzfile12* zip = (real_jzfile12*) _zip;
   int len = (int)strlen(zip->name);
   // Check whether zip name ends in "rt.jar"
   // This will match other archives named rt.jar as well, but this is
   // only used for debugging.
   return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
 }
 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
   ClassPathEntry* cpe = resolve_entry(THREAD);
   if (cpe != NULL) {
     cpe->compile_the_world(loader, CHECK);
   }
 }
 bool LazyClassPathEntry::is_rt_jar() {
   Thread* THREAD = Thread::current();
   ClassPathEntry* cpe = resolve_entry(THREAD);
   return (cpe != NULL) ? cpe->is_jar_file() : false;
 }
 void ClassLoader::compile_the_world() {
   EXCEPTION_MARK;
   HandleMark hm(THREAD);
   ResourceMark rm(THREAD);
   // Make sure we don't run with background compilation
   BackgroundCompilation = false;
   // Find bootstrap loader
   Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
   // Iterate over all bootstrap class path entries
   ClassPathEntry* e = _first_entry;
   jlong start = os::javaTimeMillis();
   while (e != NULL) {
     // We stop at rt.jar, unless it is the first bootstrap path entry
     if (e->is_rt_jar() && e != _first_entry) break;
     e->compile_the_world(system_class_loader, CATCH);
     e = e->next();
   }
   jlong end = os::javaTimeMillis();
   tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
                 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
   {
     // Print statistics as if before normal exit:
     extern void print_statistics();
     print_statistics();
   }
   vm_exit(0);
 }
 int ClassLoader::_compile_the_world_class_counter = 0;
 int ClassLoader::_compile_the_world_method_counter = 0;
 static int _codecache_sweep_counter = 0;
 // Filter out all exceptions except OOMs
 static void clear_pending_exception_if_not_oom(TRAPS) {
   if (HAS_PENDING_EXCEPTION &&
       !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
     CLEAR_PENDING_EXCEPTION;
   }
   // The CHECK at the caller will propagate the exception out
 }
 /**
  * Returns if the given method should be compiled when doing compile-the-world.
  *
  * TODO:  This should be a private method in a CompileTheWorld class.
  */
 static bool can_be_compiled(methodHandle m, int comp_level) {
   assert(CompileTheWorld, "must be");
   // It's not valid to compile a native wrapper for MethodHandle methods
   // that take a MemberName appendix since the bytecode signature is not
   // correct.
   vmIntrinsics::ID iid = m->intrinsic_id();
   if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
     return false;
   }
   return CompilationPolicy::can_be_compiled(m, comp_level);
 }
 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
   int len = (int)strlen(name);
   if (len > 6 && strcmp(".class", name + len - 6) == 0) {
     // We have a .class file
     char buffer[2048];
     strncpy(buffer, name, len - 6);
     buffer[len-6] = 0;
     // If the file has a period after removing .class, it's not really a
     // valid class file.  The class loader will check everything else.
     if (strchr(buffer, '.') == NULL) {
       _compile_the_world_class_counter++;
       if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
       // Construct name without extension
       TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
       // Use loader to load and initialize class
       Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
       instanceKlassHandle k (THREAD, ik);
       if (k.not_null() && !HAS_PENDING_EXCEPTION) {
         k->initialize(THREAD);
       }
       bool exception_occurred = HAS_PENDING_EXCEPTION;
       clear_pending_exception_if_not_oom(CHECK);
       if (CompileTheWorldPreloadClasses && k.not_null()) {
         ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
         if (HAS_PENDING_EXCEPTION) {
           // If something went wrong in preloading we just ignore it
           clear_pending_exception_if_not_oom(CHECK);
           tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
         }
       }
       if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
         if (k.is_null() || exception_occurred) {
           // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
           tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
         } else {
           tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
           // Preload all classes to get around uncommon traps
           // Iterate over all methods in class
           int comp_level = CompilationPolicy::policy()->initial_compile_level();
           for (int n = 0; n < k->methods()->length(); n++) {
             methodHandle m (THREAD, k->methods()->at(n));
             if (can_be_compiled(m, comp_level)) {
               if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
                 // Give sweeper a chance to keep up with CTW
                 VM_ForceSafepoint op;
                 VMThread::execute(&op);
                 _codecache_sweep_counter = 0;
               }
               // Force compilation
               CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
                                             methodHandle(), 0, "CTW", THREAD);
               if (HAS_PENDING_EXCEPTION) {
                 clear_pending_exception_if_not_oom(CHECK);
                 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
               } else {
                 _compile_the_world_method_counter++;
               }
               if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
                 // Clobber the first compile and force second tier compilation
                 nmethod* nm = m->code();
                 if (nm != NULL && !m->is_method_handle_intrinsic()) {
                   // Throw out the code so that the code cache doesn't fill up
                   nm->make_not_entrant();
                 }
                 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
                                               methodHandle(), 0, "CTW", THREAD);
                 if (HAS_PENDING_EXCEPTION) {
                   clear_pending_exception_if_not_oom(CHECK);
                   tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
                 } else {
                   _compile_the_world_method_counter++;
                 }
               }
             } else {
               tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
             }
             nmethod* nm = m->code();
             if (nm != NULL && !m->is_method_handle_intrinsic()) {
               // Throw out the code so that the code cache doesn't fill up
               nm->make_not_entrant();
             }
           }
         }
       }
     }
   }
 }
 #endif //PRODUCT
 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
 void PerfClassTraceTime::initialize() {
   if (!UsePerfData) return;
   if (_eventp != NULL) {
     // increment the event counter
     _eventp->inc();
   }
   // stop the current active thread-local timer to measure inclusive time
   _prev_active_event = -1;
   for (int i=0; i < EVENT_TYPE_COUNT; i++) {
      if (_timers[i].is_active()) {
        assert(_prev_active_event == -1, "should have only one active timer");
        _prev_active_event = i;
        _timers[i].stop();
      }
   }
   if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
     // start the inclusive timer if not recursively called
     _t.start();
   }
   // start thread-local timer of the given event type
    if (!_timers[_event_type].is_active()) {
     _timers[_event_type].start();
   }
 }
 PerfClassTraceTime::~PerfClassTraceTime() {
   if (!UsePerfData) return;
   // stop the thread-local timer as the event completes
   // and resume the thread-local timer of the event next on the stack
   _timers[_event_type].stop();
   jlong selftime = _timers[_event_type].ticks();
   if (_prev_active_event >= 0) {
     _timers[_prev_active_event].start();
   }
   if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
   // increment the counters only on the leaf call
   _t.stop();
   _timep->inc(_t.ticks());
   if (_selftimep != NULL) {
     _selftimep->inc(selftime);
   }
   // add all class loading related event selftime to the accumulated time counter
   ClassLoader::perf_accumulated_time()->inc(selftime);
   // reset the timer
   _timers[_event_type].reset();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/classLoader.cpp@b985cbb00e68 (annotated)

src/share/vm/classfile/classLoader.cpp