classLoader.cpp revision 7426:0f6100dde08e 
1/*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/classFileParser.hpp"
27#include "classfile/classFileStream.hpp"
28#include "classfile/classLoader.hpp"
29#include "classfile/classLoaderExt.hpp"
30#include "classfile/classLoaderData.inline.hpp"
31#include "classfile/javaClasses.hpp"
32#include "classfile/systemDictionary.hpp"
33#include "classfile/vmSymbols.hpp"
34#include "compiler/compileBroker.hpp"
35#include "gc_interface/collectedHeap.inline.hpp"
36#include "interpreter/bytecodeStream.hpp"
37#include "interpreter/oopMapCache.hpp"
38#include "memory/allocation.inline.hpp"
39#include "memory/filemap.hpp"
40#include "memory/generation.hpp"
41#include "memory/oopFactory.hpp"
42#include "memory/universe.inline.hpp"
43#include "oops/instanceKlass.hpp"
44#include "oops/instanceRefKlass.hpp"
45#include "oops/oop.inline.hpp"
46#include "oops/symbol.hpp"
47#include "prims/jvm_misc.hpp"
48#include "runtime/arguments.hpp"
49#include "runtime/compilationPolicy.hpp"
50#include "runtime/fprofiler.hpp"
51#include "runtime/handles.hpp"
52#include "runtime/handles.inline.hpp"
53#include "runtime/init.hpp"
54#include "runtime/interfaceSupport.hpp"
55#include "runtime/java.hpp"
56#include "runtime/javaCalls.hpp"
57#include "runtime/os.hpp"
58#include "runtime/threadCritical.hpp"
59#include "runtime/timer.hpp"
60#include "services/management.hpp"
61#include "services/threadService.hpp"
62#include "utilities/events.hpp"
63#include "utilities/hashtable.inline.hpp"
64#include "utilities/macros.hpp"
65#if INCLUDE_CDS
66#include "classfile/sharedPathsMiscInfo.hpp"
67#include "classfile/sharedClassUtil.hpp"
68#endif
69
70
71// Entry points in zip.dll for loading zip/jar file entries
72
73typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
74typedef void (JNICALL *ZipClose_t)(jzfile *zip);
75typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
76typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
77typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
78typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
79typedef jint     (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
80
81static ZipOpen_t         ZipOpen            = NULL;
82static ZipClose_t        ZipClose           = NULL;
83static FindEntry_t       FindEntry          = NULL;
84static ReadEntry_t       ReadEntry          = NULL;
85static ReadMappedEntry_t ReadMappedEntry    = NULL;
86static GetNextEntry_t    GetNextEntry       = NULL;
87static canonicalize_fn_t CanonicalizeEntry  = NULL;
88static Crc32_t           Crc32              = NULL;
89
90// Globals
91
92PerfCounter*    ClassLoader::_perf_accumulated_time = NULL;
93PerfCounter*    ClassLoader::_perf_classes_inited = NULL;
94PerfCounter*    ClassLoader::_perf_class_init_time = NULL;
95PerfCounter*    ClassLoader::_perf_class_init_selftime = NULL;
96PerfCounter*    ClassLoader::_perf_classes_verified = NULL;
97PerfCounter*    ClassLoader::_perf_class_verify_time = NULL;
98PerfCounter*    ClassLoader::_perf_class_verify_selftime = NULL;
99PerfCounter*    ClassLoader::_perf_classes_linked = NULL;
100PerfCounter*    ClassLoader::_perf_class_link_time = NULL;
101PerfCounter*    ClassLoader::_perf_class_link_selftime = NULL;
102PerfCounter*    ClassLoader::_perf_class_parse_time = NULL;
103PerfCounter*    ClassLoader::_perf_class_parse_selftime = NULL;
104PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = NULL;
105PerfCounter*    ClassLoader::_perf_shared_classload_time = NULL;
106PerfCounter*    ClassLoader::_perf_sys_classload_time = NULL;
107PerfCounter*    ClassLoader::_perf_app_classload_time = NULL;
108PerfCounter*    ClassLoader::_perf_app_classload_selftime = NULL;
109PerfCounter*    ClassLoader::_perf_app_classload_count = NULL;
110PerfCounter*    ClassLoader::_perf_define_appclasses = NULL;
111PerfCounter*    ClassLoader::_perf_define_appclass_time = NULL;
112PerfCounter*    ClassLoader::_perf_define_appclass_selftime = NULL;
113PerfCounter*    ClassLoader::_perf_app_classfile_bytes_read = NULL;
114PerfCounter*    ClassLoader::_perf_sys_classfile_bytes_read = NULL;
115PerfCounter*    ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
116PerfCounter*    ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
117PerfCounter*    ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
118PerfCounter*    ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
119PerfCounter*    ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
120PerfCounter*    ClassLoader::_unsafe_defineClassCallCounter = NULL;
121PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
122PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
123
124ClassPathEntry* ClassLoader::_first_entry         = NULL;
125ClassPathEntry* ClassLoader::_last_entry          = NULL;
126int             ClassLoader::_num_entries         = 0;
127PackageHashtable* ClassLoader::_package_hash_table = NULL;
128
129#if INCLUDE_CDS
130SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
131#endif
132// helper routines
133bool string_starts_with(const char* str, const char* str_to_find) {
134  size_t str_len = strlen(str);
135  size_t str_to_find_len = strlen(str_to_find);
136  if (str_to_find_len > str_len) {
137    return false;
138  }
139  return (strncmp(str, str_to_find, str_to_find_len) == 0);
140}
141
142bool string_ends_with(const char* str, const char* str_to_find) {
143  size_t str_len = strlen(str);
144  size_t str_to_find_len = strlen(str_to_find);
145  if (str_to_find_len > str_len) {
146    return false;
147  }
148  return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
149}
150
151
152MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
153  if (num_meta_package_names == 0) {
154    _meta_package_names = NULL;
155    _num_meta_package_names = 0;
156  } else {
157    _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
158    _num_meta_package_names = num_meta_package_names;
159    memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
160  }
161}
162
163
164MetaIndex::~MetaIndex() {
165  FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
166}
167
168
169bool MetaIndex::may_contain(const char* class_name) {
170  if ( _num_meta_package_names == 0) {
171    return false;
172  }
173  size_t class_name_len = strlen(class_name);
174  for (int i = 0; i < _num_meta_package_names; i++) {
175    char* pkg = _meta_package_names[i];
176    size_t pkg_len = strlen(pkg);
177    size_t min_len = MIN2(class_name_len, pkg_len);
178    if (!strncmp(class_name, pkg, min_len)) {
179      return true;
180    }
181  }
182  return false;
183}
184
185
186ClassPathEntry::ClassPathEntry() {
187  set_next(NULL);
188}
189
190
191bool ClassPathEntry::is_lazy() {
192  return false;
193}
194
195ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
196  char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
197  strcpy(copy, dir);
198  _dir = copy;
199}
200
201
202ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
203  // construct full path name
204  char path[JVM_MAXPATHLEN];
205  if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
206    return NULL;
207  }
208  // check if file exists
209  struct stat st;
210  if (os::stat(path, &st) == 0) {
211#if INCLUDE_CDS
212    if (DumpSharedSpaces) {
213      // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
214      // we should never find a file underneath it -- unless user has added a new file while we are running
215      // the dump, in which case let's quit!
216      ShouldNotReachHere();
217    }
218#endif
219    // found file, open it
220    int file_handle = os::open(path, 0, 0);
221    if (file_handle != -1) {
222      // read contents into resource array
223      u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
224      size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
225      // close file
226      os::close(file_handle);
227      // construct ClassFileStream
228      if (num_read == (size_t)st.st_size) {
229        if (UsePerfData) {
230          ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
231        }
232        return new ClassFileStream(buffer, st.st_size, _dir);    // Resource allocated
233      }
234    }
235  }
236  return NULL;
237}
238
239
240ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
241  _zip = zip;
242  char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
243  strcpy(copy, zip_name);
244  _zip_name = copy;
245}
246
247ClassPathZipEntry::~ClassPathZipEntry() {
248  if (ZipClose != NULL) {
249    (*ZipClose)(_zip);
250  }
251  FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
252}
253
254u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
255    // enable call to C land
256  JavaThread* thread = JavaThread::current();
257  ThreadToNativeFromVM ttn(thread);
258  // check whether zip archive contains name
259  jint name_len;
260  jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
261  if (entry == NULL) return NULL;
262  u1* buffer;
263  char name_buf[128];
264  char* filename;
265  if (name_len < 128) {
266    filename = name_buf;
267  } else {
268    filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
269  }
270
271  // file found, get pointer to the entry in mmapped jar file.
272  if (ReadMappedEntry == NULL ||
273      !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
274      // mmapped access not available, perhaps due to compression,
275      // read contents into resource array
276      int size = (*filesize) + ((nul_terminate) ? 1 : 0);
277      buffer = NEW_RESOURCE_ARRAY(u1, size);
278      if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
279  }
280
281  // return result
282  if (nul_terminate) {
283    buffer[*filesize] = 0;
284  }
285  return buffer;
286}
287
288ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
289  jint filesize;
290  u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
291  if (buffer == NULL) {
292    return NULL;
293  }
294  if (UsePerfData) {
295    ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
296  }
297  return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
298}
299
300// invoke function for each entry in the zip file
301void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
302  JavaThread* thread = JavaThread::current();
303  HandleMark  handle_mark(thread);
304  ThreadToNativeFromVM ttn(thread);
305  for (int n = 0; ; n++) {
306    jzentry * ze = ((*GetNextEntry)(_zip, n));
307    if (ze == NULL) break;
308    (*f)(ze->name, context);
309  }
310}
311
312LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
313  _path = os::strdup_check_oom(path);
314  _st = *st;
315  _meta_index = NULL;
316  _resolved_entry = NULL;
317  _has_error = false;
318  _throw_exception = throw_exception;
319}
320
321LazyClassPathEntry::~LazyClassPathEntry() {
322  os::free((void*)_path);
323}
324
325bool LazyClassPathEntry::is_jar_file() {
326  return ((_st.st_mode & S_IFREG) == S_IFREG);
327}
328
329ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
330  if (_resolved_entry != NULL) {
331    return (ClassPathEntry*) _resolved_entry;
332  }
333  ClassPathEntry* new_entry = NULL;
334  new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
335  if (!_throw_exception && new_entry == NULL) {
336    assert(!HAS_PENDING_EXCEPTION, "must be");
337    return NULL;
338  }
339  {
340    ThreadCritical tc;
341    if (_resolved_entry == NULL) {
342      _resolved_entry = new_entry;
343      return new_entry;
344    }
345  }
346  assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
347  delete new_entry;
348  return (ClassPathEntry*) _resolved_entry;
349}
350
351ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
352  if (_meta_index != NULL &&
353      !_meta_index->may_contain(name)) {
354    return NULL;
355  }
356  if (_has_error) {
357    return NULL;
358  }
359  ClassPathEntry* cpe = resolve_entry(THREAD);
360  if (cpe == NULL) {
361    _has_error = true;
362    return NULL;
363  } else {
364    return cpe->open_stream(name, THREAD);
365  }
366}
367
368bool LazyClassPathEntry::is_lazy() {
369  return true;
370}
371
372u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
373  if (_has_error) {
374    return NULL;
375  }
376  ClassPathEntry* cpe = resolve_entry(THREAD);
377  if (cpe == NULL) {
378    _has_error = true;
379    return NULL;
380  } else if (cpe->is_jar_file()) {
381    return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
382  } else {
383    ShouldNotReachHere();
384    *filesize = 0;
385    return NULL;
386  }
387}
388
389static void print_meta_index(LazyClassPathEntry* entry,
390                             GrowableArray<char*>& meta_packages) {
391  tty->print("[Meta index for %s=", entry->name());
392  for (int i = 0; i < meta_packages.length(); i++) {
393    if (i > 0) tty->print(" ");
394    tty->print("%s", meta_packages.at(i));
395  }
396  tty->print_cr("]");
397}
398
399#if INCLUDE_CDS
400void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
401  assert(DumpSharedSpaces, "only called at dump time");
402  tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
403  vm_exit_during_initialization(error, message);
404}
405#endif
406
407void ClassLoader::trace_class_path(const char* msg, const char* name) {
408  if (!TraceClassPaths) {
409    return;
410  }
411
412  if (msg) {
413    tty->print("%s", msg);
414  }
415  if (name) {
416    if (strlen(name) < 256) {
417      tty->print("%s", name);
418    } else {
419      // For very long paths, we need to print each character separately,
420      // as print_cr() has a length limit
421      while (name[0] != '\0') {
422        tty->print("%c", name[0]);
423        name++;
424      }
425    }
426  }
427  if (msg && msg[0] == '[') {
428    tty->print_cr("]");
429  } else {
430    tty->cr();
431  }
432}
433
434void ClassLoader::setup_bootstrap_meta_index() {
435  // Set up meta index which allows us to open boot jars lazily if
436  // class data sharing is enabled
437  const char* meta_index_path = Arguments::get_meta_index_path();
438  const char* meta_index_dir  = Arguments::get_meta_index_dir();
439  setup_meta_index(meta_index_path, meta_index_dir, 0);
440}
441
442void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
443  const char* known_version = "% VERSION 2";
444  FILE* file = fopen(meta_index_path, "r");
445  int line_no = 0;
446#if INCLUDE_CDS
447  if (DumpSharedSpaces) {
448    if (file != NULL) {
449      _shared_paths_misc_info->add_required_file(meta_index_path);
450    } else {
451      _shared_paths_misc_info->add_nonexist_path(meta_index_path);
452    }
453  }
454#endif
455  if (file != NULL) {
456    ResourceMark rm;
457    LazyClassPathEntry* cur_entry = NULL;
458    GrowableArray<char*> boot_class_path_packages(10);
459    char package_name[256];
460    bool skipCurrentJar = false;
461    while (fgets(package_name, sizeof(package_name), file) != NULL) {
462      ++line_no;
463      // Remove trailing newline
464      package_name[strlen(package_name) - 1] = '\0';
465      switch(package_name[0]) {
466        case '%':
467        {
468          if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
469            if (TraceClassLoading && Verbose) {
470              tty->print("[Unsupported meta index version]");
471            }
472            fclose(file);
473            return;
474          }
475        }
476
477        // These directives indicate jar files which contain only
478        // classes, only non-classfile resources, or a combination of
479        // the two. See src/share/classes/sun/misc/MetaIndex.java and
480        // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
481        // workspace.
482        case '#':
483        case '!':
484        case '@':
485        {
486          // Hand off current packages to current lazy entry (if any)
487          if ((cur_entry != NULL) &&
488              (boot_class_path_packages.length() > 0)) {
489            if ((TraceClassLoading || TraceClassPaths) && Verbose) {
490              print_meta_index(cur_entry, boot_class_path_packages);
491            }
492            MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
493                                             boot_class_path_packages.length());
494            cur_entry->set_meta_index(index);
495          }
496          cur_entry = NULL;
497          boot_class_path_packages.clear();
498
499          // Find lazy entry corresponding to this jar file
500          int count = 0;
501          for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
502            if (count >= start_index &&
503                entry->is_lazy() &&
504                string_starts_with(entry->name(), meta_index_dir) &&
505                string_ends_with(entry->name(), &package_name[2])) {
506              cur_entry = (LazyClassPathEntry*) entry;
507              break;
508            }
509          }
510
511          // If the first character is '@', it indicates the following jar
512          // file is a resource only jar file in which case, we should skip
513          // reading the subsequent entries since the resource loading is
514          // totally handled by J2SE side.
515          if (package_name[0] == '@') {
516            if (cur_entry != NULL) {
517              cur_entry->set_meta_index(new MetaIndex(NULL, 0));
518            }
519            cur_entry = NULL;
520            skipCurrentJar = true;
521          } else {
522            skipCurrentJar = false;
523          }
524
525          break;
526        }
527
528        default:
529        {
530          if (!skipCurrentJar && cur_entry != NULL) {
531            char* new_name = os::strdup_check_oom(package_name);
532            boot_class_path_packages.append(new_name);
533          }
534        }
535      }
536    }
537    // Hand off current packages to current lazy entry (if any)
538    if ((cur_entry != NULL) &&
539        (boot_class_path_packages.length() > 0)) {
540      if ((TraceClassLoading || TraceClassPaths) && Verbose) {
541        print_meta_index(cur_entry, boot_class_path_packages);
542      }
543      MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
544                                       boot_class_path_packages.length());
545      cur_entry->set_meta_index(index);
546    }
547    fclose(file);
548  }
549}
550
551#if INCLUDE_CDS
552void ClassLoader::check_shared_classpath(const char *path) {
553  if (strcmp(path, "") == 0) {
554    exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
555  }
556
557  struct stat st;
558  if (os::stat(path, &st) == 0) {
559    if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
560      if (!os::dir_is_empty(path)) {
561        tty->print_cr("Error: non-empty directory '%s'", path);
562        exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
563      }
564    }
565  }
566}
567#endif
568
569void ClassLoader::setup_bootstrap_search_path() {
570  assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
571  const char* sys_class_path = Arguments::get_sysclasspath();
572  if (PrintSharedArchiveAndExit) {
573    // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
574    // the same as the bootcp of the shared archive.
575  } else {
576    trace_class_path("[Bootstrap loader class path=", sys_class_path);
577  }
578#if INCLUDE_CDS
579  if (DumpSharedSpaces) {
580    _shared_paths_misc_info->add_boot_classpath(sys_class_path);
581  }
582#endif
583  setup_search_path(sys_class_path);
584}
585
586#if INCLUDE_CDS
587int ClassLoader::get_shared_paths_misc_info_size() {
588  return _shared_paths_misc_info->get_used_bytes();
589}
590
591void* ClassLoader::get_shared_paths_misc_info() {
592  return _shared_paths_misc_info->buffer();
593}
594
595bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
596  SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
597  bool result = checker->check();
598  delete checker;
599  return result;
600}
601#endif
602
603void ClassLoader::setup_search_path(const char *class_path) {
604  int offset = 0;
605  int len = (int)strlen(class_path);
606  int end = 0;
607
608  // Iterate over class path entries
609  for (int start = 0; start < len; start = end) {
610    while (class_path[end] && class_path[end] != os::path_separator()[0]) {
611      end++;
612    }
613    EXCEPTION_MARK;
614    ResourceMark rm(THREAD);
615    char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
616    strncpy(path, &class_path[start], end - start);
617    path[end - start] = '\0';
618    update_class_path_entry_list(path, false);
619#if INCLUDE_CDS
620    if (DumpSharedSpaces) {
621      check_shared_classpath(path);
622    }
623#endif
624    while (class_path[end] == os::path_separator()[0]) {
625      end++;
626    }
627  }
628}
629
630ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
631                                                     bool lazy, bool throw_exception, TRAPS) {
632  JavaThread* thread = JavaThread::current();
633  if (lazy) {
634    return new LazyClassPathEntry(path, st, throw_exception);
635  }
636  ClassPathEntry* new_entry = NULL;
637  if ((st->st_mode & S_IFREG) == S_IFREG) {
638    // Regular file, should be a zip file
639    // Canonicalized filename
640    char canonical_path[JVM_MAXPATHLEN];
641    if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
642      // This matches the classic VM
643      if (throw_exception) {
644        THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
645      } else {
646        return NULL;
647      }
648    }
649    char* error_msg = NULL;
650    jzfile* zip;
651    {
652      // enable call to C land
653      ThreadToNativeFromVM ttn(thread);
654      HandleMark hm(thread);
655      zip = (*ZipOpen)(canonical_path, &error_msg);
656    }
657    if (zip != NULL && error_msg == NULL) {
658      new_entry = new ClassPathZipEntry(zip, path);
659      if (TraceClassLoading || TraceClassPaths) {
660        tty->print_cr("[Opened %s]", path);
661      }
662    } else {
663      ResourceMark rm(thread);
664      char *msg;
665      if (error_msg == NULL) {
666        msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
667        jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
668      } else {
669        int len = (int)(strlen(path) + strlen(error_msg) + 128);
670        msg = NEW_RESOURCE_ARRAY(char, len); ;
671        jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
672      }
673      if (throw_exception) {
674        THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
675      } else {
676        return NULL;
677      }
678    }
679  } else {
680    // Directory
681    new_entry = new ClassPathDirEntry(path);
682    if (TraceClassLoading || TraceClassPaths) {
683      tty->print_cr("[Path %s]", path);
684    }
685  }
686  return new_entry;
687}
688
689
690// Create a class path zip entry for a given path (return NULL if not found
691// or zip/JAR file cannot be opened)
692ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
693  // check for a regular file
694  struct stat st;
695  if (os::stat(path, &st) == 0) {
696    if ((st.st_mode & S_IFREG) == S_IFREG) {
697      char canonical_path[JVM_MAXPATHLEN];
698      if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
699        char* error_msg = NULL;
700        jzfile* zip;
701        {
702          // enable call to C land
703          JavaThread* thread = JavaThread::current();
704          ThreadToNativeFromVM ttn(thread);
705          HandleMark hm(thread);
706          zip = (*ZipOpen)(canonical_path, &error_msg);
707        }
708        if (zip != NULL && error_msg == NULL) {
709          // create using canonical path
710          return new ClassPathZipEntry(zip, canonical_path);
711        }
712      }
713    }
714  }
715  return NULL;
716}
717
718// returns true if entry already on class path
719bool ClassLoader::contains_entry(ClassPathEntry *entry) {
720  ClassPathEntry* e = _first_entry;
721  while (e != NULL) {
722    // assume zip entries have been canonicalized
723    if (strcmp(entry->name(), e->name()) == 0) {
724      return true;
725    }
726    e = e->next();
727  }
728  return false;
729}
730
731void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
732  if (new_entry != NULL) {
733    if (_last_entry == NULL) {
734      _first_entry = _last_entry = new_entry;
735    } else {
736      _last_entry->set_next(new_entry);
737      _last_entry = new_entry;
738    }
739  }
740  _num_entries ++;
741}
742
743// Returns true IFF the file/dir exists and the entry was successfully created.
744bool ClassLoader::update_class_path_entry_list(const char *path,
745                                               bool check_for_duplicates,
746                                               bool throw_exception) {
747  struct stat st;
748  if (os::stat(path, &st) == 0) {
749    // File or directory found
750    ClassPathEntry* new_entry = NULL;
751    Thread* THREAD = Thread::current();
752    new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
753    if (new_entry == NULL) {
754      return false;
755    }
756    // The kernel VM adds dynamically to the end of the classloader path and
757    // doesn't reorder the bootclasspath which would break java.lang.Package
758    // (see PackageInfo).
759    // Add new entry to linked list
760    if (!check_for_duplicates || !contains_entry(new_entry)) {
761      ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
762    }
763    return true;
764  } else {
765#if INCLUDE_CDS
766    if (DumpSharedSpaces) {
767      _shared_paths_misc_info->add_nonexist_path(path);
768    }
769#endif
770    return false;
771  }
772}
773
774void ClassLoader::print_bootclasspath() {
775  ClassPathEntry* e = _first_entry;
776  tty->print("[bootclasspath= ");
777  while (e != NULL) {
778    tty->print("%s ;", e->name());
779    e = e->next();
780  }
781  tty->print_cr("]");
782}
783
784void ClassLoader::load_zip_library() {
785  assert(ZipOpen == NULL, "should not load zip library twice");
786  // First make sure native library is loaded
787  os::native_java_library();
788  // Load zip library
789  char path[JVM_MAXPATHLEN];
790  char ebuf[1024];
791  void* handle = NULL;
792  if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
793    handle = os::dll_load(path, ebuf, sizeof ebuf);
794  }
795  if (handle == NULL) {
796    vm_exit_during_initialization("Unable to load ZIP library", path);
797  }
798  // Lookup zip entry points
799  ZipOpen      = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
800  ZipClose     = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
801  FindEntry    = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
802  ReadEntry    = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
803  ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
804  GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
805  Crc32        = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
806
807  // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
808  if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
809      GetNextEntry == NULL || Crc32 == NULL) {
810    vm_exit_during_initialization("Corrupted ZIP library", path);
811  }
812
813  // Lookup canonicalize entry in libjava.dll
814  void *javalib_handle = os::native_java_library();
815  CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
816  // This lookup only works on 1.3. Do not check for non-null here
817}
818
819int ClassLoader::crc32(int crc, const char* buf, int len) {
820  assert(Crc32 != NULL, "ZIP_CRC32 is not found");
821  return (*Crc32)(crc, (const jbyte*)buf, len);
822}
823
824// PackageInfo data exists in order to support the java.lang.Package
825// class.  A Package object provides information about a java package
826// (version, vendor, etc.) which originates in the manifest of the jar
827// file supplying the package.  For application classes, the ClassLoader
828// object takes care of this.
829
830// For system (boot) classes, the Java code in the Package class needs
831// to be able to identify which source jar file contained the boot
832// class, so that it can extract the manifest from it.  This table
833// identifies java packages with jar files in the boot classpath.
834
835// Because the boot classpath cannot change, the classpath index is
836// sufficient to identify the source jar file or directory.  (Since
837// directories have no manifests, the directory name is not required,
838// but is available.)
839
840// When using sharing -- the pathnames of entries in the boot classpath
841// may not be the same at runtime as they were when the archive was
842// created (NFS, Samba, etc.).  The actual files and directories named
843// in the classpath must be the same files, in the same order, even
844// though the exact name is not the same.
845
846class PackageInfo: public BasicHashtableEntry<mtClass> {
847public:
848  const char* _pkgname;       // Package name
849  int _classpath_index;       // Index of directory or JAR file loaded from
850
851  PackageInfo* next() {
852    return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
853  }
854
855  const char* pkgname()           { return _pkgname; }
856  void set_pkgname(char* pkgname) { _pkgname = pkgname; }
857
858  const char* filename() {
859    return ClassLoader::classpath_entry(_classpath_index)->name();
860  }
861
862  void set_index(int index) {
863    _classpath_index = index;
864  }
865};
866
867
868class PackageHashtable : public BasicHashtable<mtClass> {
869private:
870  inline unsigned int compute_hash(const char *s, int n) {
871    unsigned int val = 0;
872    while (--n >= 0) {
873      val = *s++ + 31 * val;
874    }
875    return val;
876  }
877
878  PackageInfo* bucket(int index) {
879    return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
880  }
881
882  PackageInfo* get_entry(int index, unsigned int hash,
883                         const char* pkgname, size_t n) {
884    for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
885      if (pp->hash() == hash &&
886          strncmp(pkgname, pp->pkgname(), n) == 0 &&
887          pp->pkgname()[n] == '\0') {
888        return pp;
889      }
890    }
891    return NULL;
892  }
893
894public:
895  PackageHashtable(int table_size)
896    : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
897
898  PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
899    : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
900
901  PackageInfo* get_entry(const char* pkgname, int n) {
902    unsigned int hash = compute_hash(pkgname, n);
903    return get_entry(hash_to_index(hash), hash, pkgname, n);
904  }
905
906  PackageInfo* new_entry(char* pkgname, int n) {
907    unsigned int hash = compute_hash(pkgname, n);
908    PackageInfo* pp;
909    pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
910    pp->set_pkgname(pkgname);
911    return pp;
912  }
913
914  void add_entry(PackageInfo* pp) {
915    int index = hash_to_index(pp->hash());
916    BasicHashtable<mtClass>::add_entry(index, pp);
917  }
918
919  void copy_pkgnames(const char** packages) {
920    int n = 0;
921    for (int i = 0; i < table_size(); ++i) {
922      for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
923        packages[n++] = pp->pkgname();
924      }
925    }
926    assert(n == number_of_entries(), "just checking");
927  }
928
929  CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
930};
931
932#if INCLUDE_CDS
933void PackageHashtable::copy_table(char** top, char* end,
934                                  PackageHashtable* table) {
935  // Copy (relocate) the table to the shared space.
936  BasicHashtable<mtClass>::copy_table(top, end);
937
938  // Calculate the space needed for the package name strings.
939  int i;
940  intptr_t* tableSize = (intptr_t*)(*top);
941  *top += sizeof(intptr_t);  // For table size
942  char* tableStart = *top;
943
944  for (i = 0; i < table_size(); ++i) {
945    for (PackageInfo* pp = table->bucket(i);
946                      pp != NULL;
947                      pp = pp->next()) {
948      int n1 = (int)(strlen(pp->pkgname()) + 1);
949      if (*top + n1 >= end) {
950        report_out_of_shared_space(SharedMiscData);
951      }
952      pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
953      *top += n1;
954    }
955  }
956  *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
957  if (*top >= end) {
958    report_out_of_shared_space(SharedMiscData);
959  }
960
961  // Write table size
962  intptr_t len = *top - (char*)tableStart;
963  *tableSize = len;
964}
965
966
967void ClassLoader::copy_package_info_buckets(char** top, char* end) {
968  _package_hash_table->copy_buckets(top, end);
969}
970
971void ClassLoader::copy_package_info_table(char** top, char* end) {
972  _package_hash_table->copy_table(top, end, _package_hash_table);
973}
974#endif
975
976PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
977  const char *cp = strrchr(pkgname, '/');
978  if (cp != NULL) {
979    // Package prefix found
980    int n = cp - pkgname + 1;
981    return _package_hash_table->get_entry(pkgname, n);
982  }
983  return NULL;
984}
985
986
987bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
988  assert(pkgname != NULL, "just checking");
989  // Bootstrap loader no longer holds system loader lock obj serializing
990  // load_instance_class and thereby add_package
991  {
992    MutexLocker ml(PackageTable_lock, THREAD);
993    // First check for previously loaded entry
994    PackageInfo* pp = lookup_package(pkgname);
995    if (pp != NULL) {
996      // Existing entry found, check source of package
997      pp->set_index(classpath_index);
998      return true;
999    }
1000
1001    const char *cp = strrchr(pkgname, '/');
1002    if (cp != NULL) {
1003      // Package prefix found
1004      int n = cp - pkgname + 1;
1005
1006      char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
1007      if (new_pkgname == NULL) {
1008        return false;
1009      }
1010
1011      memcpy(new_pkgname, pkgname, n);
1012      new_pkgname[n] = '\0';
1013      pp = _package_hash_table->new_entry(new_pkgname, n);
1014      pp->set_index(classpath_index);
1015
1016      // Insert into hash table
1017      _package_hash_table->add_entry(pp);
1018    }
1019    return true;
1020  }
1021}
1022
1023
1024oop ClassLoader::get_system_package(const char* name, TRAPS) {
1025  PackageInfo* pp;
1026  {
1027    MutexLocker ml(PackageTable_lock, THREAD);
1028    pp = lookup_package(name);
1029  }
1030  if (pp == NULL) {
1031    return NULL;
1032  } else {
1033    Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1034    return p();
1035  }
1036}
1037
1038
1039objArrayOop ClassLoader::get_system_packages(TRAPS) {
1040  ResourceMark rm(THREAD);
1041  int nof_entries;
1042  const char** packages;
1043  {
1044    MutexLocker ml(PackageTable_lock, THREAD);
1045    // Allocate resource char* array containing package names
1046    nof_entries = _package_hash_table->number_of_entries();
1047    if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1048      return NULL;
1049    }
1050    _package_hash_table->copy_pkgnames(packages);
1051  }
1052  // Allocate objArray and fill with java.lang.String
1053  objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1054                                           nof_entries, CHECK_0);
1055  objArrayHandle result(THREAD, r);
1056  for (int i = 0; i < nof_entries; i++) {
1057    Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1058    result->obj_at_put(i, str());
1059  }
1060
1061  return result();
1062}
1063
1064
1065instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1066  ResourceMark rm(THREAD);
1067  const char* class_name = h_name->as_C_string();
1068  EventMark m("loading class %s", class_name);
1069  ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1070
1071  stringStream st;
1072  // st.print() uses too much stack space while handling a StackOverflowError
1073  // st.print("%s.class", h_name->as_utf8());
1074  st.print_raw(h_name->as_utf8());
1075  st.print_raw(".class");
1076  const char* file_name = st.as_string();
1077  ClassLoaderExt::Context context(class_name, file_name, THREAD);
1078
1079  // Lookup stream for parsing .class file
1080  ClassFileStream* stream = NULL;
1081  int classpath_index = 0;
1082  ClassPathEntry* e = NULL;
1083  instanceKlassHandle h;
1084  {
1085    PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1086                               ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1087                               PerfClassTraceTime::CLASS_LOAD);
1088    e = _first_entry;
1089    while (e != NULL) {
1090      stream = e->open_stream(file_name, CHECK_NULL);
1091      if (!context.check(stream, classpath_index)) {
1092        return h; // NULL
1093      }
1094      if (stream != NULL) {
1095        break;
1096      }
1097      e = e->next();
1098      ++classpath_index;
1099    }
1100  }
1101
1102  if (stream != NULL) {
1103    // class file found, parse it
1104    ClassFileParser parser(stream);
1105    ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1106    Handle protection_domain;
1107    TempNewSymbol parsed_name = NULL;
1108    instanceKlassHandle result = parser.parseClassFile(h_name,
1109                                                       loader_data,
1110                                                       protection_domain,
1111                                                       parsed_name,
1112                                                       context.should_verify(classpath_index),
1113                                                       THREAD);
1114    if (HAS_PENDING_EXCEPTION) {
1115      ResourceMark rm;
1116      if (DumpSharedSpaces) {
1117        tty->print_cr("Preload Error: Failed to load %s", class_name);
1118      }
1119      return h;
1120    }
1121    h = context.record_result(classpath_index, e, result, THREAD);
1122  } else {
1123    if (DumpSharedSpaces) {
1124      tty->print_cr("Preload Warning: Cannot find %s", class_name);
1125    }
1126  }
1127
1128  return h;
1129}
1130
1131
1132void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1133                                            int number_of_entries) {
1134  assert(_package_hash_table == NULL, "One package info table allowed.");
1135  assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1136         "bad shared package info size.");
1137  _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1138                                             number_of_entries);
1139}
1140
1141
1142void ClassLoader::create_package_info_table() {
1143    assert(_package_hash_table == NULL, "shouldn't have one yet");
1144    _package_hash_table = new PackageHashtable(package_hash_table_size);
1145}
1146
1147
1148// Initialize the class loader's access to methods in libzip.  Parse and
1149// process the boot classpath into a list ClassPathEntry objects.  Once
1150// this list has been created, it must not change order (see class PackageInfo)
1151// it can be appended to and is by jvmti and the kernel vm.
1152
1153void ClassLoader::initialize() {
1154  assert(_package_hash_table == NULL, "should have been initialized by now.");
1155  EXCEPTION_MARK;
1156
1157  if (UsePerfData) {
1158    // jvmstat performance counters
1159    NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1160    NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1161    NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1162    NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1163    NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1164    NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1165    NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1166    NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1167    NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1168    NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1169
1170    NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1171    NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1172    NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1173    NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1174    NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1175    NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1176    NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1177    NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1178    NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1179    NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1180    NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1181    NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1182    NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1183
1184
1185    // The following performance counters are added for measuring the impact
1186    // of the bug fix of 6365597. They are mainly focused on finding out
1187    // the behavior of system & user-defined classloader lock, whether
1188    // ClassLoader.loadClass/findClass is being called synchronized or not.
1189    // Also two additional counters are created to see whether 'UnsyncloadClass'
1190    // flag is being set or not and how many times load_instance_class call
1191    // fails with linkageError etc.
1192    NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1193                        "systemLoaderLockContentionRate");
1194    NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1195                        "nonSystemLoaderLockContentionRate");
1196    NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1197                        "jvmFindLoadedClassNoLockCalls");
1198    NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1199                        "jvmDefineClassNoLockCalls");
1200
1201    NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1202                        "jniDefineClassNoLockCalls");
1203
1204    NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1205                        "unsafeDefineClassCalls");
1206
1207    NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1208    NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1209                        "loadInstanceClassFailRate");
1210
1211    // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1212    if (UnsyncloadClass) {
1213      _isUnsyncloadClass->inc();
1214    }
1215  }
1216
1217  // lookup zip library entry points
1218  load_zip_library();
1219#if INCLUDE_CDS
1220  // initialize search path
1221  if (DumpSharedSpaces) {
1222    _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1223  }
1224#endif
1225  setup_bootstrap_search_path();
1226  if (LazyBootClassLoader) {
1227    // set up meta index which makes boot classpath initialization lazier
1228    setup_bootstrap_meta_index();
1229  }
1230}
1231
1232#if INCLUDE_CDS
1233void ClassLoader::initialize_shared_path() {
1234  if (DumpSharedSpaces) {
1235    ClassLoaderExt::setup_search_paths();
1236    _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1237  }
1238}
1239#endif
1240
1241jlong ClassLoader::classloader_time_ms() {
1242  return UsePerfData ?
1243    Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1244}
1245
1246jlong ClassLoader::class_init_count() {
1247  return UsePerfData ? _perf_classes_inited->get_value() : -1;
1248}
1249
1250jlong ClassLoader::class_init_time_ms() {
1251  return UsePerfData ?
1252    Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1253}
1254
1255jlong ClassLoader::class_verify_time_ms() {
1256  return UsePerfData ?
1257    Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1258}
1259
1260jlong ClassLoader::class_link_count() {
1261  return UsePerfData ? _perf_classes_linked->get_value() : -1;
1262}
1263
1264jlong ClassLoader::class_link_time_ms() {
1265  return UsePerfData ?
1266    Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1267}
1268
1269int ClassLoader::compute_Object_vtable() {
1270  // hardwired for JDK1.2 -- would need to duplicate class file parsing
1271  // code to determine actual value from file
1272  // Would be value '11' if finals were in vtable
1273  int JDK_1_2_Object_vtable_size = 5;
1274  return JDK_1_2_Object_vtable_size * vtableEntry::size();
1275}
1276
1277
1278void classLoader_init() {
1279  ClassLoader::initialize();
1280}
1281
1282
1283bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1284  assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1285  if (CanonicalizeEntry != NULL) {
1286    JavaThread* THREAD = JavaThread::current();
1287    JNIEnv* env = THREAD->jni_environment();
1288    ResourceMark rm(THREAD);
1289
1290    // os::native_path writes into orig_copy
1291    char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1292    strcpy(orig_copy, orig);
1293    if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1294      return false;
1295    }
1296  } else {
1297    // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1298    strncpy(out, orig, len);
1299    out[len - 1] = '\0';
1300  }
1301  return true;
1302}
1303
1304#ifndef PRODUCT
1305
1306void ClassLoader::verify() {
1307  _package_hash_table->verify();
1308}
1309
1310
1311// CompileTheWorld
1312//
1313// Iterates over all class path entries and forces compilation of all methods
1314// in all classes found. Currently, only zip/jar archives are searched.
1315//
1316// The classes are loaded by the Java level bootstrap class loader, and the
1317// initializer is called. If DelayCompilationDuringStartup is true (default),
1318// the interpreter will run the initialization code. Note that forcing
1319// initialization in this way could potentially lead to initialization order
1320// problems, in which case we could just force the initialization bit to be set.
1321
1322
1323// We need to iterate over the contents of a zip/jar file, so we replicate the
1324// jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1325// since jzfile already has a void* definition.
1326//
1327// Note that this is only used in debug mode.
1328//
1329// HotSpot integration note:
1330// Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1331
1332
1333// JDK 1.3 version
1334typedef struct real_jzentry {         /* Zip file entry */
1335    char *name;                 /* entry name */
1336    jint time;                  /* modification time */
1337    jint size;                  /* size of uncompressed data */
1338    jint csize;                 /* size of compressed data (zero if uncompressed) */
1339    jint crc;                   /* crc of uncompressed data */
1340    char *comment;              /* optional zip file comment */
1341    jbyte *extra;               /* optional extra data */
1342    jint pos;                   /* position of LOC header (if negative) or data */
1343} real_jzentry;
1344
1345typedef struct real_jzfile {  /* Zip file */
1346    char *name;                 /* zip file name */
1347    jint refs;                  /* number of active references */
1348    jint fd;                    /* open file descriptor */
1349    void *lock;                 /* read lock */
1350    char *comment;              /* zip file comment */
1351    char *msg;                  /* zip error message */
1352    void *entries;              /* array of hash cells */
1353    jint total;                 /* total number of entries */
1354    unsigned short *table;      /* Hash chain heads: indexes into entries */
1355    jint tablelen;              /* number of hash eads */
1356    real_jzfile *next;        /* next zip file in search list */
1357    jzentry *cache;             /* we cache the most recently freed jzentry */
1358    /* Information on metadata names in META-INF directory */
1359    char **metanames;           /* array of meta names (may have null names) */
1360    jint metacount;             /* number of slots in metanames array */
1361    /* If there are any per-entry comments, they are in the comments array */
1362    char **comments;
1363} real_jzfile;
1364
1365void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1366  // For now we only compile all methods in all classes in zip/jar files
1367  tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1368  tty->cr();
1369}
1370
1371
1372bool ClassPathDirEntry::is_rt_jar() {
1373  return false;
1374}
1375
1376void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1377  real_jzfile* zip = (real_jzfile*) _zip;
1378  tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1379  tty->cr();
1380  // Iterate over all entries in zip file
1381  for (int n = 0; ; n++) {
1382    real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1383    if (ze == NULL) break;
1384    ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1385  }
1386  if (HAS_PENDING_EXCEPTION) {
1387    if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1388      CLEAR_PENDING_EXCEPTION;
1389      tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1390      tty->print_cr("Increase class metadata storage if a limit was set");
1391    } else {
1392      tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1393    }
1394  }
1395}
1396
1397bool ClassPathZipEntry::is_rt_jar() {
1398  real_jzfile* zip = (real_jzfile*) _zip;
1399  int len = (int)strlen(zip->name);
1400  // Check whether zip name ends in "rt.jar"
1401  // This will match other archives named rt.jar as well, but this is
1402  // only used for debugging.
1403  return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1404}
1405
1406void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1407  ClassPathEntry* cpe = resolve_entry(THREAD);
1408  if (cpe != NULL) {
1409    cpe->compile_the_world(loader, CHECK);
1410  }
1411}
1412
1413bool LazyClassPathEntry::is_rt_jar() {
1414  Thread* THREAD = Thread::current();
1415  ClassPathEntry* cpe = resolve_entry(THREAD);
1416  return (cpe != NULL) ? cpe->is_jar_file() : false;
1417}
1418
1419void ClassLoader::compile_the_world() {
1420  EXCEPTION_MARK;
1421  HandleMark hm(THREAD);
1422  ResourceMark rm(THREAD);
1423  // Make sure we don't run with background compilation
1424  BackgroundCompilation = false;
1425  // Find bootstrap loader
1426  Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1427  // Iterate over all bootstrap class path entries
1428  ClassPathEntry* e = _first_entry;
1429  jlong start = os::javaTimeMillis();
1430  while (e != NULL) {
1431    // We stop at rt.jar, unless it is the first bootstrap path entry
1432    if (e->is_rt_jar() && e != _first_entry) break;
1433    e->compile_the_world(system_class_loader, CATCH);
1434    e = e->next();
1435  }
1436  jlong end = os::javaTimeMillis();
1437  tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1438                _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1439  {
1440    // Print statistics as if before normal exit:
1441    extern void print_statistics();
1442    print_statistics();
1443  }
1444  vm_exit(0);
1445}
1446
1447int ClassLoader::_compile_the_world_class_counter = 0;
1448int ClassLoader::_compile_the_world_method_counter = 0;
1449static int _codecache_sweep_counter = 0;
1450
1451// Filter out all exceptions except OOMs
1452static void clear_pending_exception_if_not_oom(TRAPS) {
1453  if (HAS_PENDING_EXCEPTION &&
1454      !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1455    CLEAR_PENDING_EXCEPTION;
1456  }
1457  // The CHECK at the caller will propagate the exception out
1458}
1459
1460/**
1461 * Returns if the given method should be compiled when doing compile-the-world.
1462 *
1463 * TODO:  This should be a private method in a CompileTheWorld class.
1464 */
1465static bool can_be_compiled(methodHandle m, int comp_level) {
1466  assert(CompileTheWorld, "must be");
1467
1468  // It's not valid to compile a native wrapper for MethodHandle methods
1469  // that take a MemberName appendix since the bytecode signature is not
1470  // correct.
1471  vmIntrinsics::ID iid = m->intrinsic_id();
1472  if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1473    return false;
1474  }
1475
1476  return CompilationPolicy::can_be_compiled(m, comp_level);
1477}
1478
1479void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1480  int len = (int)strlen(name);
1481  if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1482    // We have a .class file
1483    char buffer[2048];
1484    strncpy(buffer, name, len - 6);
1485    buffer[len-6] = 0;
1486    // If the file has a period after removing .class, it's not really a
1487    // valid class file.  The class loader will check everything else.
1488    if (strchr(buffer, '.') == NULL) {
1489      _compile_the_world_class_counter++;
1490      if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1491
1492      // Construct name without extension
1493      TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1494      // Use loader to load and initialize class
1495      Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1496      instanceKlassHandle k (THREAD, ik);
1497      if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1498        k->initialize(THREAD);
1499      }
1500      bool exception_occurred = HAS_PENDING_EXCEPTION;
1501      clear_pending_exception_if_not_oom(CHECK);
1502      if (CompileTheWorldPreloadClasses && k.not_null()) {
1503        ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1504        if (HAS_PENDING_EXCEPTION) {
1505          // If something went wrong in preloading we just ignore it
1506          clear_pending_exception_if_not_oom(CHECK);
1507          tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1508        }
1509      }
1510
1511      if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1512        if (k.is_null() || exception_occurred) {
1513          // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1514          tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1515        } else {
1516          tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1517          // Preload all classes to get around uncommon traps
1518          // Iterate over all methods in class
1519          int comp_level = CompilationPolicy::policy()->initial_compile_level();
1520          for (int n = 0; n < k->methods()->length(); n++) {
1521            methodHandle m (THREAD, k->methods()->at(n));
1522            if (can_be_compiled(m, comp_level)) {
1523              if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1524                // Give sweeper a chance to keep up with CTW
1525                VM_ForceSafepoint op;
1526                VMThread::execute(&op);
1527                _codecache_sweep_counter = 0;
1528              }
1529              // Force compilation
1530              CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1531                                            methodHandle(), 0, "CTW", THREAD);
1532              if (HAS_PENDING_EXCEPTION) {
1533                clear_pending_exception_if_not_oom(CHECK);
1534                tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1535              } else {
1536                _compile_the_world_method_counter++;
1537              }
1538              if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1539                // Clobber the first compile and force second tier compilation
1540                nmethod* nm = m->code();
1541                if (nm != NULL && !m->is_method_handle_intrinsic()) {
1542                  // Throw out the code so that the code cache doesn't fill up
1543                  nm->make_not_entrant();
1544                  m->clear_code();
1545                }
1546                CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1547                                              methodHandle(), 0, "CTW", THREAD);
1548                if (HAS_PENDING_EXCEPTION) {
1549                  clear_pending_exception_if_not_oom(CHECK);
1550                  tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1551                } else {
1552                  _compile_the_world_method_counter++;
1553                }
1554              }
1555            } else {
1556              tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1557            }
1558
1559            nmethod* nm = m->code();
1560            if (nm != NULL && !m->is_method_handle_intrinsic()) {
1561              // Throw out the code so that the code cache doesn't fill up
1562              nm->make_not_entrant();
1563              m->clear_code();
1564            }
1565          }
1566        }
1567      }
1568    }
1569  }
1570}
1571
1572#endif //PRODUCT
1573
1574// Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1575// they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1576void PerfClassTraceTime::initialize() {
1577  if (!UsePerfData) return;
1578
1579  if (_eventp != NULL) {
1580    // increment the event counter
1581    _eventp->inc();
1582  }
1583
1584  // stop the current active thread-local timer to measure inclusive time
1585  _prev_active_event = -1;
1586  for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1587     if (_timers[i].is_active()) {
1588       assert(_prev_active_event == -1, "should have only one active timer");
1589       _prev_active_event = i;
1590       _timers[i].stop();
1591     }
1592  }
1593
1594  if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1595    // start the inclusive timer if not recursively called
1596    _t.start();
1597  }
1598
1599  // start thread-local timer of the given event type
1600   if (!_timers[_event_type].is_active()) {
1601    _timers[_event_type].start();
1602  }
1603}
1604
1605PerfClassTraceTime::~PerfClassTraceTime() {
1606  if (!UsePerfData) return;
1607
1608  // stop the thread-local timer as the event completes
1609  // and resume the thread-local timer of the event next on the stack
1610  _timers[_event_type].stop();
1611  jlong selftime = _timers[_event_type].ticks();
1612
1613  if (_prev_active_event >= 0) {
1614    _timers[_prev_active_event].start();
1615  }
1616
1617  if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1618
1619  // increment the counters only on the leaf call
1620  _t.stop();
1621  _timep->inc(_t.ticks());
1622  if (_selftimep != NULL) {
1623    _selftimep->inc(selftime);
1624  }
1625  // add all class loading related event selftime to the accumulated time counter
1626  ClassLoader::perf_accumulated_time()->inc(selftime);
1627
1628  // reset the timer
1629  _timers[_event_type].reset();
1630}
1631