classLoader.cpp 59.2 KB
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/*
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 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 * 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.
 *
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 * 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.
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 *
 */

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#include "precompiled.hpp"
#include "classfile/classFileParser.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
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#include "classfile/classLoaderExt.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/javaClasses.hpp"
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#if INCLUDE_CDS
#include "classfile/sharedPathsMiscInfo.hpp"
#include "classfile/sharedClassUtil.hpp"
#endif
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#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"
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#include "memory/filemap.hpp"
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#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"
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#include "oops/symbol.hpp"
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#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
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#ifdef TARGET_OS_FAMILY_aix
# include "os_aix.inline.hpp"
#endif
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#ifdef TARGET_OS_FAMILY_bsd
# include "os_bsd.inline.hpp"
#endif
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// 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);
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typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
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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;
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static Crc32_t           Crc32              = NULL;
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// Globals

PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
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PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
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PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
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PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
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PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
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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;
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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;
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int             ClassLoader::_num_entries         = 0;
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PackageHashtable* ClassLoader::_package_hash_table = NULL;

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#if INCLUDE_CDS
SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
#endif
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// 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 {
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    _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
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    _num_meta_package_names = num_meta_package_names;
    memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
  }
}


MetaIndex::~MetaIndex() {
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  FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
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}


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;
}

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ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
  char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
  strcpy(copy, dir);
  _dir = copy;
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}


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ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
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  // 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) {
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#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
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    // found file, open it
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    int file_handle = os::open(path, 0, 0);
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    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
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      os::close(file_handle);
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      // construct ClassFileStream
      if (num_read == (size_t)st.st_size) {
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        if (UsePerfData) {
          ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
        }
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        return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
      }
    }
  }
  return NULL;
}


ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
  _zip = zip;
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  char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
  strcpy(copy, zip_name);
  _zip_name = copy;
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}

ClassPathZipEntry::~ClassPathZipEntry() {
  if (ZipClose != NULL) {
    (*ZipClose)(_zip);
  }
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  FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
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}

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u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
    // enable call to C land
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  JavaThread* thread = JavaThread::current();
  ThreadToNativeFromVM ttn(thread);
  // check whether zip archive contains name
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  jint name_len;
  jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
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  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);
  }

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  // file found, get pointer to the entry in mmapped jar file.
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  if (ReadMappedEntry == NULL ||
      !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
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      // mmapped access not available, perhaps due to compression,
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      // read contents into resource array
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      int size = (*filesize) + ((nul_terminate) ? 1 : 0);
      buffer = NEW_RESOURCE_ARRAY(u1, size);
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      if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
  }
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  // 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;
  }
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  if (UsePerfData) {
    ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
  }
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  return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
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}

// 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);
  }
}

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LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
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  _path = strdup(path);
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  _st = *st;
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  _meta_index = NULL;
  _resolved_entry = NULL;
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  _has_error = false;
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  _throw_exception = throw_exception;
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}

bool LazyClassPathEntry::is_jar_file() {
  return ((_st.st_mode & S_IFREG) == S_IFREG);
}

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ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
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  if (_resolved_entry != NULL) {
    return (ClassPathEntry*) _resolved_entry;
  }
  ClassPathEntry* new_entry = NULL;
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  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;
  }
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  {
    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;
}

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ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
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  if (_meta_index != NULL &&
      !_meta_index->may_contain(name)) {
    return NULL;
  }
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  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);
  }
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}

bool LazyClassPathEntry::is_lazy() {
  return true;
}

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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;
  }
}

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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(" ");
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    tty->print("%s", meta_packages.at(i));
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  }
  tty->print_cr("]");
}

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#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(const char* msg, const char* name) {
  if (!TraceClassPaths) {
    return;
  }

  if (msg) {
    tty->print("%s", msg);
  }
  if (name) {
    if (strlen(name) < 256) {
      tty->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') {
        tty->print("%c", name[0]);
        name++;
      }
    }
  }
  if (msg && msg[0] == '[') {
    tty->print_cr("]");
  } else {
    tty->cr();
  }
}
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void ClassLoader::setup_bootstrap_meta_index() {
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  // Set up meta index which allows us to open boot jars lazily if
  // class data sharing is enabled
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  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) {
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  const char* known_version = "% VERSION 2";
  FILE* file = fopen(meta_index_path, "r");
  int line_no = 0;
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#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
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  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)) {
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            if ((TraceClassLoading || TraceClassPaths) && Verbose) {
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              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
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          int count = 0;
          for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
            if (count >= start_index &&
                entry->is_lazy() &&
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                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)) {
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      if ((TraceClassLoading || TraceClassPaths) && Verbose) {
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        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);
  }
}

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#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

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void ClassLoader::setup_bootstrap_search_path() {
  assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
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  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 {
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    trace_class_path("[Bootstrap loader class path=", sys_class_path);
  }
#if INCLUDE_CDS
  if (DumpSharedSpaces) {
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    _shared_paths_misc_info->add_boot_classpath(sys_class_path);
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  }
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#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();
}
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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

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void ClassLoader::setup_search_path(const char *class_path) {
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  int offset = 0;
  int len = (int)strlen(class_path);
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  int end = 0;

  // Iterate over class path entries
  for (int start = 0; start < len; start = end) {
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    while (class_path[end] && class_path[end] != os::path_separator()[0]) {
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      end++;
    }
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    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';
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    update_class_path_entry_list(path, false);
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#if INCLUDE_CDS
    if (DumpSharedSpaces) {
      check_shared_classpath(path);
    }
#endif
    while (class_path[end] == os::path_separator()[0]) {
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      end++;
    }
  }
}

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ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
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                                                     bool lazy, bool throw_exception, TRAPS) {
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  JavaThread* thread = JavaThread::current();
  if (lazy) {
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    return new LazyClassPathEntry(path, st, throw_exception);
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  }
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  ClassPathEntry* new_entry = NULL;
  if ((st->st_mode & S_IFREG) == S_IFREG) {
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    // 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
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      if (throw_exception) {
        THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
      } else {
        return NULL;
      }
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    }
    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) {
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      new_entry = new ClassPathZipEntry(zip, path);
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      if (TraceClassLoading || TraceClassPaths) {
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        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);
      }
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      if (throw_exception) {
        THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
      } else {
        return NULL;
      }
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    }
  } else {
    // Directory
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    new_entry = new ClassPathDirEntry(path);
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    if (TraceClassLoading || TraceClassPaths) {
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      tty->print_cr("[Path %s]", path);
    }
  }
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  return new_entry;
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}


// 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];
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      if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
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        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;
    }
  }
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  _num_entries ++;
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}

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// Returns true IFF the file/dir exists and the entry was successfully created.
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bool ClassLoader::update_class_path_entry_list(const char *path,
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                                               bool check_for_duplicates,
                                               bool throw_exception) {
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  struct stat st;
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  if (os::stat(path, &st) == 0) {
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    // File or directory found
    ClassPathEntry* new_entry = NULL;
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    Thread* THREAD = Thread::current();
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    new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
    if (new_entry == NULL) {
      return false;
    }
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    // 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)) {
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      ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
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    }
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    return true;
  } else {
#if INCLUDE_CDS
    if (DumpSharedSpaces) {
      _shared_paths_misc_info->add_nonexist_path(path);
    }
#endif
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    return false;
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  }
}

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];
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  void* handle = NULL;
  if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
    handle = os::dll_load(path, ebuf, sizeof ebuf);
  }
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  if (handle == NULL) {
    vm_exit_during_initialization("Unable to load ZIP library", path);
  }
  // Lookup zip entry points
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  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"));
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  Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
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  // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
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  if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
      GetNextEntry == NULL || Crc32 == NULL) {
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    vm_exit_during_initialization("Corrupted ZIP library", path);
  }

  // Lookup canonicalize entry in libjava.dll
  void *javalib_handle = os::native_java_library();
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  CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
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  // This lookup only works on 1.3. Do not check for non-null here
}

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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);
}

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// 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.

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class PackageInfo: public BasicHashtableEntry<mtClass> {
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public:
  const char* _pkgname;       // Package name
  int _classpath_index;       // Index of directory or JAR file loaded from

  PackageInfo* next() {
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    return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
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  }

  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;
  }
};


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class PackageHashtable : public BasicHashtable<mtClass> {
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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) {
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    return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
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  }

  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)
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    : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
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  PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
    : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
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  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;
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    pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
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    pp->set_pkgname(pkgname);
    return pp;
  }

  void add_entry(PackageInfo* pp) {
    int index = hash_to_index(pp->hash());
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    BasicHashtable<mtClass>::add_entry(index, pp);
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  }

  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");
  }

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  CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
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};

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#if INCLUDE_CDS
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void PackageHashtable::copy_table(char** top, char* end,
                                  PackageHashtable* table) {
  // Copy (relocate) the table to the shared space.
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  BasicHashtable<mtClass>::copy_table(top, end);
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  // Calculate the space needed for the package name strings.
  int i;
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  intptr_t* tableSize = (intptr_t*)(*top);
  *top += sizeof(intptr_t);  // For table size
  char* tableStart = *top;
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  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);
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      if (*top + n1 >= end) {
        report_out_of_shared_space(SharedMiscData);
      }
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      pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
      *top += n1;
    }
  }
  *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
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  if (*top >= end) {
    report_out_of_shared_space(SharedMiscData);
  }

  // Write table size
  intptr_t len = *top - (char*)tableStart;
  *tableSize = len;
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}


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);
}
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#endif
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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;

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      char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
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      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
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  objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
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                                           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();
}


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instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
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  ResourceMark rm(THREAD);
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  const char* class_name = h_name->as_C_string();
  EventMark m("loading class %s", class_name);
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  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");
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  const char* file_name = st.as_string();
  ClassLoaderExt::Context context(class_name, file_name, THREAD);
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  // Lookup stream for parsing .class file
  ClassFileStream* stream = NULL;
  int classpath_index = 0;
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  ClassPathEntry* e = NULL;
  instanceKlassHandle h;
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  {
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    PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
                               ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
                               PerfClassTraceTime::CLASS_LOAD);
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    e = _first_entry;
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    while (e != NULL) {
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      stream = e->open_stream(file_name, CHECK_NULL);
      if (!context.check(stream, classpath_index)) {
        return h; // NULL
      }
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      if (stream != NULL) {
        break;
      }
      e = e->next();
      ++classpath_index;
    }
  }

  if (stream != NULL) {
    // class file found, parse it
    ClassFileParser parser(stream);
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    ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
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    Handle protection_domain;
1117
    TempNewSymbol parsed_name = NULL;
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    instanceKlassHandle result = parser.parseClassFile(h_name,
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                                                       loader_data,
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                                                       protection_domain,
                                                       parsed_name,
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                                                       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;
    }
    h = context.record_result(classpath_index, e, result, THREAD);
  } else {
    if (DumpSharedSpaces) {
      tty->print_cr("Preload Error: Cannot find %s", class_name);
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    }
  }

  return h;
}


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void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
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                                            int number_of_entries) {
  assert(_package_hash_table == NULL, "One package info table allowed.");
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  assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
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         "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");
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    NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
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    NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
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    NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
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    NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
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    NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
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    NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
    NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
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    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");

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    // 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();
1229
#if INCLUDE_CDS
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  // initialize search path
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  if (DumpSharedSpaces) {
    _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
  }
#endif
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  setup_bootstrap_search_path();
  if (LazyBootClassLoader) {
    // set up meta index which makes boot classpath initialization lazier
1238
    setup_bootstrap_meta_index();
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  }
}

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#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
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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();
}


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bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
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  assert(orig != NULL && out != NULL && len > 0, "bad arguments");
  if (CanonicalizeEntry != NULL) {
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    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) {
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      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");
1424
      tty->print_cr("Increase class metadata storage if a limit was set");
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    } 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) {
1487 1488 1489 1490
  ClassPathEntry* cpe = resolve_entry(THREAD);
  if (cpe != NULL) {
    cpe->compile_the_world(loader, CHECK);
  }
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}

bool LazyClassPathEntry::is_rt_jar() {
1494 1495 1496
  Thread* THREAD = Thread::current();
  ClassPathEntry* cpe = resolve_entry(THREAD);
  return (cpe != NULL) ? cpe->is_jar_file() : false;
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}

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;
1509
  jlong start = os::javaTimeMillis();
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  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();
  }
1516
  jlong end = os::javaTimeMillis();
1517
  tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1518
                _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
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  {
    // Print statistics as if before normal exit:
    extern void print_statistics();
    print_statistics();
  }
  vm_exit(0);
}

1527 1528
int ClassLoader::_compile_the_world_class_counter = 0;
int ClassLoader::_compile_the_world_method_counter = 0;
1529
static int _codecache_sweep_counter = 0;
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// 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
}

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/**
 * 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);
}

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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) {
1569 1570
      _compile_the_world_class_counter++;
      if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
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      // Construct name without extension
1573
      TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
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      // Use loader to load and initialize class
1575
      Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
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      instanceKlassHandle k (THREAD, ik);
      if (k.not_null() && !HAS_PENDING_EXCEPTION) {
        k->initialize(THREAD);
      }
      bool exception_occurred = HAS_PENDING_EXCEPTION;
1581
      clear_pending_exception_if_not_oom(CHECK);
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      if (CompileTheWorldPreloadClasses && k.not_null()) {
1583
        ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
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        if (HAS_PENDING_EXCEPTION) {
          // If something went wrong in preloading we just ignore it
1586
          clear_pending_exception_if_not_oom(CHECK);
1587
          tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
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        }
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      }

1591
      if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1592
        if (k.is_null() || exception_occurred) {
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          // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1594
          tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
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        } else {
1596
          tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
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          // Preload all classes to get around uncommon traps
          // Iterate over all methods in class
1599
          int comp_level = CompilationPolicy::policy()->initial_compile_level();
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          for (int n = 0; n < k->methods()->length(); n++) {
1601
            methodHandle m (THREAD, k->methods()->at(n));
1602
            if (can_be_compiled(m, comp_level)) {
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              if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
                // Give sweeper a chance to keep up with CTW
                VM_ForceSafepoint op;
                VMThread::execute(&op);
                _codecache_sweep_counter = 0;
              }
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              // Force compilation
1610
              CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
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                                            methodHandle(), 0, "CTW", THREAD);
              if (HAS_PENDING_EXCEPTION) {
1613
                clear_pending_exception_if_not_oom(CHECK);
1614
                tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1615 1616
              } else {
                _compile_the_world_method_counter++;
D
duke 已提交
1617
              }
1618
              if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
N
never 已提交
1619 1620
                // Clobber the first compile and force second tier compilation
                nmethod* nm = m->code();
1621
                if (nm != NULL && !m->is_method_handle_intrinsic()) {
N
never 已提交
1622 1623 1624 1625
                  // Throw out the code so that the code cache doesn't fill up
                  nm->make_not_entrant();
                  m->clear_code();
                }
I
iveresov 已提交
1626
                CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
N
never 已提交
1627 1628
                                              methodHandle(), 0, "CTW", THREAD);
                if (HAS_PENDING_EXCEPTION) {
1629
                  clear_pending_exception_if_not_oom(CHECK);
1630
                  tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1631 1632
                } else {
                  _compile_the_world_method_counter++;
N
never 已提交
1633
                }
D
duke 已提交
1634
              }
1635 1636
            } else {
              tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
D
duke 已提交
1637
            }
N
never 已提交
1638 1639

            nmethod* nm = m->code();
1640
            if (nm != NULL && !m->is_method_handle_intrinsic()) {
N
never 已提交
1641 1642 1643
              // Throw out the code so that the code cache doesn't fill up
              nm->make_not_entrant();
              m->clear_code();
D
duke 已提交
1644 1645 1646 1647 1648 1649 1650 1651 1652
            }
          }
        }
      }
    }
  }
}

#endif //PRODUCT
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710

// 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();
}