/* * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/classLoaderExt.hpp" #include "classfile/javaClasses.hpp" #include "classfile/jimage.hpp" #include "classfile/moduleEntry.hpp" #include "classfile/modules.hpp" #include "classfile/packageEntry.hpp" #include "classfile/klassFactory.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "compiler/compileBroker.hpp" #include "gc/shared/collectedHeap.inline.hpp" #include "gc/shared/generation.hpp" #include "interpreter/bytecodeStream.hpp" #include "interpreter/oopMapCache.hpp" #include "logging/logTag.hpp" #include "memory/allocation.inline.hpp" #include "memory/filemap.hpp" #include "memory/oopFactory.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.inline.hpp" #include "oops/instanceKlass.hpp" #include "oops/instanceRefKlass.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "oops/symbol.hpp" #include "prims/jvm_misc.hpp" #include "runtime/arguments.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/fprofiler.hpp" #include "runtime/handles.hpp" #include "runtime/handles.inline.hpp" #include "runtime/init.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/os.hpp" #include "runtime/threadCritical.hpp" #include "runtime/timer.hpp" #include "runtime/vm_version.hpp" #include "services/management.hpp" #include "services/threadService.hpp" #include "utilities/events.hpp" #include "utilities/hashtable.inline.hpp" #include "utilities/macros.hpp" #if INCLUDE_CDS #include "classfile/sharedClassUtil.hpp" #include "classfile/sharedPathsMiscInfo.hpp" #endif // Entry points in zip.dll for loading zip/jar file entries typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); typedef void (JNICALL *ZipClose_t)(jzfile *zip); typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); static ZipOpen_t ZipOpen = NULL; static ZipClose_t ZipClose = NULL; static FindEntry_t FindEntry = NULL; static ReadEntry_t ReadEntry = NULL; static ReadMappedEntry_t ReadMappedEntry = NULL; static GetNextEntry_t GetNextEntry = NULL; static canonicalize_fn_t CanonicalizeEntry = NULL; static ZipInflateFully_t ZipInflateFully = NULL; static Crc32_t Crc32 = NULL; // Entry points for jimage.dll for loading jimage file entries static JImageOpen_t JImageOpen = NULL; static JImageClose_t JImageClose = NULL; static JImagePackageToModule_t JImagePackageToModule = NULL; static JImageFindResource_t JImageFindResource = NULL; static JImageGetResource_t JImageGetResource = NULL; static JImageResourceIterator_t JImageResourceIterator = NULL; static JImage_ResourcePath_t JImageResourcePath = NULL; // Globals PerfCounter* ClassLoader::_perf_accumulated_time = NULL; PerfCounter* ClassLoader::_perf_classes_inited = NULL; PerfCounter* ClassLoader::_perf_class_init_time = NULL; PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; PerfCounter* ClassLoader::_perf_classes_verified = NULL; PerfCounter* ClassLoader::_perf_class_verify_time = NULL; PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; PerfCounter* ClassLoader::_perf_classes_linked = NULL; PerfCounter* ClassLoader::_perf_class_link_time = NULL; PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; PerfCounter* ClassLoader::_perf_class_parse_time = NULL; PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; PerfCounter* ClassLoader::_perf_app_classload_time = NULL; PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; PerfCounter* ClassLoader::_perf_app_classload_count = NULL; PerfCounter* ClassLoader::_perf_define_appclasses = NULL; PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; GrowableArray* ClassLoader::_patch_mod_entries = NULL; ClassPathEntry* ClassLoader::_first_entry = NULL; ClassPathEntry* ClassLoader::_last_entry = NULL; int ClassLoader::_num_entries = 0; ClassPathEntry* ClassLoader::_first_append_entry = NULL; bool ClassLoader::_has_jimage = false; #if INCLUDE_CDS GrowableArray* ClassLoader::_boot_modules_array = NULL; GrowableArray* ClassLoader::_platform_modules_array = NULL; SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; #endif // helper routines bool string_starts_with(const char* str, const char* str_to_find) { size_t str_len = strlen(str); size_t str_to_find_len = strlen(str_to_find); if (str_to_find_len > str_len) { return false; } return (strncmp(str, str_to_find, str_to_find_len) == 0); } static const char* get_jimage_version_string() { static char version_string[10] = ""; if (version_string[0] == '\0') { jio_snprintf(version_string, sizeof(version_string), "%d.%d", Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version()); } return (const char*)version_string; } bool ClassLoader::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); } // Used to obtain the package name from a fully qualified class name. // It is the responsibility of the caller to establish a ResourceMark. const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) { if (class_name == NULL) { if (bad_class_name != NULL) { *bad_class_name = true; } return NULL; } if (bad_class_name != NULL) { *bad_class_name = false; } const char* const last_slash = strrchr(class_name, '/'); if (last_slash == NULL) { // No package name return NULL; } char* class_name_ptr = (char*) class_name; // Skip over '['s if (*class_name_ptr == '[') { do { class_name_ptr++; } while (*class_name_ptr == '['); // Fully qualified class names should not contain a 'L'. // Set bad_class_name to true to indicate that the package name // could not be obtained due to an error condition. // In this situation, is_same_class_package returns false. if (*class_name_ptr == 'L') { if (bad_class_name != NULL) { *bad_class_name = true; } return NULL; } } int length = last_slash - class_name_ptr; // A class name could have just the slash character in the name. if (length <= 0) { // No package name if (bad_class_name != NULL) { *bad_class_name = true; } return NULL; } // drop name after last slash (including slash) // Ex., "java/lang/String.class" => "java/lang" char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1); strncpy(pkg_name, class_name_ptr, length); *(pkg_name+length) = '\0'; return (const char *)pkg_name; } // Given a fully qualified class name, find its defining package in the class loader's // package entry table. static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) { ResourceMark rm(THREAD); const char *pkg_name = ClassLoader::package_from_name(class_name); if (pkg_name == NULL) { return NULL; } PackageEntryTable* pkgEntryTable = loader_data->packages(); TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL); return pkgEntryTable->lookup_only(pkg_symbol); } ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); strcpy(copy, dir); _dir = copy; } ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { // construct full path name char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) { FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); return NULL; } // check if file exists struct stat st; if (os::stat(path, &st) == 0) { #if INCLUDE_CDS if (DumpSharedSpaces) { // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so // we should never find a file underneath it -- unless user has added a new file while we are running // the dump, in which case let's quit! ShouldNotReachHere(); } #endif // found file, open it int file_handle = os::open(path, 0, 0); if (file_handle != -1) { // read contents into resource array u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); // close file os::close(file_handle); // construct ClassFileStream if (num_read == (size_t)st.st_size) { if (UsePerfData) { ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); } FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); // Resource allocated return new ClassFileStream(buffer, st.st_size, _dir, ClassFileStream::verify); } } } FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); return NULL; } ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() { _zip = zip; char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); strcpy(copy, zip_name); _zip_name = copy; _is_boot_append = is_boot_append; _multi_versioned = _unknown; } ClassPathZipEntry::~ClassPathZipEntry() { if (ZipClose != NULL) { (*ZipClose)(_zip); } FREE_C_HEAP_ARRAY(char, _zip_name); } u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { // enable call to C land JavaThread* thread = JavaThread::current(); ThreadToNativeFromVM ttn(thread); // check whether zip archive contains name jint name_len; jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); if (entry == NULL) return NULL; u1* buffer; char name_buf[128]; char* filename; if (name_len < 128) { filename = name_buf; } else { filename = NEW_RESOURCE_ARRAY(char, name_len + 1); } // file found, get pointer to the entry in mmapped jar file. if (ReadMappedEntry == NULL || !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { // mmapped access not available, perhaps due to compression, // read contents into resource array int size = (*filesize) + ((nul_terminate) ? 1 : 0); buffer = NEW_RESOURCE_ARRAY(u1, size); if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; } // return result if (nul_terminate) { buffer[*filesize] = 0; } return buffer; } #if INCLUDE_CDS u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) { u1* buffer = NULL; if (DumpSharedSpaces && !_is_boot_append) { // We presume default is multi-release enabled const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease"); const char* verstr = Arguments::get_property("jdk.util.jar.version"); bool is_multi_ver = (multi_ver == NULL || strcmp(multi_ver, "true") == 0 || strcmp(multi_ver, "force") == 0) && is_multiple_versioned(THREAD); // command line version setting int version = 0; const int base_version = 8; // JDK8 int cur_ver = JDK_Version::current().major_version(); if (verstr != NULL) { version = atoi(verstr); if (version < base_version || version > cur_ver) { is_multi_ver = false; // print out warning, do not use assertion here since it will continue to look // for proper version. warning("JDK%d is not supported in multiple version jars", version); } } if (is_multi_ver) { int n; char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); if (version > 0) { n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name); entry_name[n] = '\0'; buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); if (buffer == NULL) { warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name); } } if (buffer == NULL) { for (int i = cur_ver; i >= base_version; i--) { n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name); entry_name[n] = '\0'; buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); if (buffer != NULL) { break; } } } FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN); } } return buffer; } bool ClassPathZipEntry::is_multiple_versioned(TRAPS) { assert(DumpSharedSpaces, "called only at dump time"); if (_multi_versioned != _unknown) { return (_multi_versioned == _yes) ? true : false; } jint size; char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false); if (buffer != NULL) { char* p = buffer; for ( ; *p; ++p) *p = tolower(*p); if (strstr(buffer, "multi-release: true") != NULL) { _multi_versioned = _yes; return true; } } _multi_versioned = _no; return false; } #endif // INCLUDE_CDS ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { jint filesize; u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL); if (buffer == NULL) { buffer = open_entry(name, &filesize, false, CHECK_NULL); if (buffer == NULL) { return NULL; } } if (UsePerfData) { ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); } // Resource allocated return new ClassFileStream(buffer, filesize, _zip_name, ClassFileStream::verify); } // 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); } } ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : ClassPathEntry(), _jimage(jimage) { guarantee(jimage != NULL, "jimage file is null"); guarantee(name != NULL, "jimage file name is null"); size_t len = strlen(name) + 1; _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); strncpy((char *)_name, name, len); } ClassPathImageEntry::~ClassPathImageEntry() { if (_name != NULL) { FREE_C_HEAP_ARRAY(const char, _name); _name = NULL; } if (_jimage != NULL) { (*JImageClose)(_jimage); _jimage = NULL; } } // For a class in a named module, look it up in the jimage file using this syntax: // /// // // Assumptions: // 1. There are no unnamed modules in the jimage file. // 2. A package is in at most one module in the jimage file. // ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { jlong size; JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); if (location == 0) { ResourceMark rm; const char* pkg_name = ClassLoader::package_from_name(name); if (pkg_name != NULL) { if (!Universe::is_module_initialized()) { location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size); #if INCLUDE_CDS // CDS uses the boot class loader to load classes whose packages are in // modules defined for other class loaders. So, for now, get their module // names from the "modules" jimage file. if (DumpSharedSpaces && location == 0) { const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); if (module_name != NULL) { location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); } } #endif } else { PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), THREAD); if (package_entry != NULL) { ResourceMark rm; // Get the module name ModuleEntry* module = package_entry->module(); assert(module != NULL, "Boot classLoader package missing module"); assert(module->is_named(), "Boot classLoader package is in unnamed module"); const char* module_name = module->name()->as_C_string(); if (module_name != NULL) { location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); } } } } } if (location != 0) { if (UsePerfData) { ClassLoader::perf_sys_classfile_bytes_read()->inc(size); } char* data = NEW_RESOURCE_ARRAY(char, size); (*JImageGetResource)(_jimage, location, data, size); // Resource allocated return new ClassFileStream((u1*)data, (int)size, _name, ClassFileStream::verify); } return NULL; } #ifndef PRODUCT bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version, const char* package, const char* name, const char* extension, void* arg) { if (strcmp(extension, "class") == 0) { Thread* THREAD = Thread::current(); ResourceMark rm(THREAD); char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); return !HAS_PENDING_EXCEPTION; } return true; } void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); tty->cr(); (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); if (HAS_PENDING_EXCEPTION) { if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { CLEAR_PENDING_EXCEPTION; tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); tty->print_cr("Increase class metadata storage if a limit was set"); } else { tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); } } } #endif bool ClassPathImageEntry::is_jrt() { return ClassLoader::is_jrt(name()); } #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 -Xlog:class+path=info to diagnose the failure"); vm_exit_during_initialization(error, message); } #endif ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { _module_name = module_name; _module_first_entry = NULL; _module_last_entry = NULL; } ModuleClassPathList::~ModuleClassPathList() { // Clean out each ClassPathEntry on list ClassPathEntry* e = _module_first_entry; while (e != NULL) { ClassPathEntry* next_entry = e->next(); delete e; e = next_entry; } } void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { if (new_entry != NULL) { if (_module_last_entry == NULL) { _module_first_entry = _module_last_entry = new_entry; } else { _module_last_entry->set_next(new_entry); _module_last_entry = new_entry; } } } void ClassLoader::trace_class_path(const char* msg, const char* name) { if (log_is_enabled(Info, class, path)) { ResourceMark rm; outputStream* out = Log(class, path)::info_stream(); if (msg) { out->print("%s", msg); } if (name) { if (strlen(name) < 256) { out->print("%s", name); } else { // For very long paths, we need to print each character separately, // as print_cr() has a length limit while (name[0] != '\0') { out->print("%c", name[0]); name++; } } } out->cr(); } } #if INCLUDE_CDS void ClassLoader::check_shared_classpath(const char *path) { if (strcmp(path, "") == 0) { exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); } struct stat st; if (os::stat(path, &st) == 0) { if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory if (!os::dir_is_empty(path)) { tty->print_cr("Error: non-empty directory '%s'", path); exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); } } } } #endif void ClassLoader::setup_bootstrap_search_path() { assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); const char* sys_class_path = Arguments::get_sysclasspath(); const char* java_class_path = Arguments::get_appclasspath(); if (PrintSharedArchiveAndExit) { // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily // the same as the bootcp of the shared archive. } else { trace_class_path("bootstrap loader class path=", sys_class_path); trace_class_path("classpath: ", java_class_path); } #if INCLUDE_CDS if (DumpSharedSpaces) { _shared_paths_misc_info->add_boot_classpath(sys_class_path); } #endif setup_search_path(sys_class_path, true); } #if INCLUDE_CDS int ClassLoader::get_shared_paths_misc_info_size() { return _shared_paths_misc_info->get_used_bytes(); } void* ClassLoader::get_shared_paths_misc_info() { return _shared_paths_misc_info->buffer(); } bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); bool result = checker->check(); delete checker; return result; } #endif // Construct the array of module/path pairs as specified to --patch-module // for the boot loader to search ahead of the jimage, if the class being // loaded is defined to a module that has been specified to --patch-module. void ClassLoader::setup_patch_mod_entries() { Thread* THREAD = Thread::current(); GrowableArray* patch_mod_args = Arguments::get_patch_mod_prefix(); int num_of_entries = patch_mod_args->length(); // Set up the boot loader's patch_mod_entries list _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray(num_of_entries, true); for (int i = 0; i < num_of_entries; i++) { const char* module_name = (patch_mod_args->at(i))->module_name(); Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); assert(module_sym != NULL, "Failed to obtain Symbol for module name"); ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); char* class_path = (patch_mod_args->at(i))->path_string(); int len = (int)strlen(class_path); int end = 0; // Iterate over the module's class path entries for (int start = 0; start < len; start = end) { while (class_path[end] && class_path[end] != os::path_separator()[0]) { end++; } EXCEPTION_MARK; ResourceMark rm(THREAD); char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); strncpy(path, &class_path[start], end - start); path[end - start] = '\0'; struct stat st; if (os::stat(path, &st) == 0) { // File or directory found Thread* THREAD = Thread::current(); ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); // If the path specification is valid, enter it into this module's list if (new_entry != NULL) { module_cpl->add_to_list(new_entry); } } while (class_path[end] == os::path_separator()[0]) { end++; } } // Record the module into the list of --patch-module entries only if // valid ClassPathEntrys have been created if (module_cpl->module_first_entry() != NULL) { _patch_mod_entries->push(module_cpl); } } } void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) { int offset = 0; int len = (int)strlen(class_path); int end = 0; bool mark_append_entry = false; // Iterate over class path entries for (int start = 0; start < len; start = end) { while (class_path[end] && class_path[end] != os::path_separator()[0]) { end++; } EXCEPTION_MARK; ResourceMark rm(THREAD); mark_append_entry = (mark_append_entry || (bootstrap_search && (start == Arguments::bootclassloader_append_index()))); char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); strncpy(path, &class_path[start], end - start); path[end - start] = '\0'; update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search); // Check on the state of the boot loader's append path if (mark_append_entry && (_first_append_entry == NULL)) { // Failure to mark the first append entry, most likely // due to a non-existent path. Record the next entry // as the first boot loader append entry. mark_append_entry = true; } else { mark_append_entry = false; } #if INCLUDE_CDS if (DumpSharedSpaces) { check_shared_classpath(path); } #endif while (class_path[end] == os::path_separator()[0]) { end++; } } } ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, bool throw_exception, bool is_boot_append, TRAPS) { JavaThread* thread = JavaThread::current(); ClassPathEntry* new_entry = NULL; if ((st->st_mode & S_IFREG) == S_IFREG) { ResourceMark rm(thread); // Regular file, should be a zip or jimage file // Canonicalized filename char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { // This matches the classic VM if (throw_exception) { THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); } else { return NULL; } } jint error; JImageFile* jimage =(*JImageOpen)(canonical_path, &error); if (jimage != NULL) { new_entry = new ClassPathImageEntry(jimage, canonical_path); } else { char* error_msg = NULL; jzfile* zip; { // enable call to C land ThreadToNativeFromVM ttn(thread); HandleMark hm(thread); zip = (*ZipOpen)(canonical_path, &error_msg); } if (zip != NULL && error_msg == NULL) { new_entry = new ClassPathZipEntry(zip, path, is_boot_append); } else { char *msg; if (error_msg == NULL) { msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, 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_IN_THREAD(thread, char, len); ; jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); } // Don't complain about bad jar files added via -Xbootclasspath/a:. if (throw_exception && is_init_completed()) { THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); } else { return NULL; } } } log_info(class, path)("opened: %s", path); log_info(class, load)("opened: %s", path); } else { // Directory new_entry = new ClassPathDirEntry(path); log_info(class, load)("path: %s", path); } return new_entry; } // Create a class path zip entry for a given path (return NULL if not found // or zip/JAR file cannot be opened) ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { // check for a regular file struct stat st; if (os::stat(path, &st) == 0) { if ((st.st_mode & S_IFREG) == S_IFREG) { char canonical_path[JVM_MAXPATHLEN]; if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { char* error_msg = NULL; jzfile* zip; { // enable call to C land JavaThread* thread = JavaThread::current(); ThreadToNativeFromVM ttn(thread); HandleMark hm(thread); zip = (*ZipOpen)(canonical_path, &error_msg); } if (zip != NULL && error_msg == NULL) { // create using canonical path return new ClassPathZipEntry(zip, canonical_path, is_boot_append); } } } } return NULL; } // The boot class loader must adhere to specfic visibility rules. // Prior to loading a class in a named package, the package is checked // to see if it is in a module defined to the boot loader. If the // package is not in a module defined to the boot loader, the class // must be loaded only in the boot loader's append path, which // consists of [-Xbootclasspath/a]; [jvmti appended entries] void ClassLoader::set_first_append_entry(ClassPathEntry *new_entry) { if (_first_append_entry == NULL) { _first_append_entry = new_entry; } } // returns true if entry already on class path bool ClassLoader::contains_entry(ClassPathEntry *entry) { ClassPathEntry* e = _first_entry; while (e != NULL) { // assume zip entries have been canonicalized if (strcmp(entry->name(), e->name()) == 0) { return true; } e = e->next(); } return false; } void ClassLoader::add_to_list(ClassPathEntry *new_entry) { if (new_entry != NULL) { if (_last_entry == NULL) { _first_entry = _last_entry = new_entry; } else { _last_entry->set_next(new_entry); _last_entry = new_entry; } } _num_entries ++; } void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) { if (new_entry != NULL) { if (_last_entry == NULL) { _first_entry = _last_entry = new_entry; } else { new_entry->set_next(_first_entry); _first_entry = new_entry; } } _num_entries ++; } void ClassLoader::add_to_list(const char *apath) { update_class_path_entry_list((char*)apath, false, false, false, false); } void ClassLoader::prepend_to_list(const char *apath) { update_class_path_entry_list((char*)apath, false, false, true, false); } // Returns true IFF the file/dir exists and the entry was successfully created. bool ClassLoader::update_class_path_entry_list(const char *path, bool check_for_duplicates, bool mark_append_entry, bool prepend_entry, bool is_boot_append, bool throw_exception) { struct stat st; if (os::stat(path, &st) == 0) { // File or directory found ClassPathEntry* new_entry = NULL; Thread* THREAD = Thread::current(); new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); if (new_entry == NULL) { return false; } // Ensure that the first boot loader append entry will always be set correctly. assert((!mark_append_entry || (mark_append_entry && (!check_for_duplicates || !contains_entry(new_entry)))), "failed to mark boot loader's first append boundary"); // Do not reorder the bootclasspath which would break get_system_package(). // Add new entry to linked list if (!check_for_duplicates || !contains_entry(new_entry)) { ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry, prepend_entry); if (mark_append_entry) { set_first_append_entry(new_entry); } } return true; } else { #if INCLUDE_CDS if (DumpSharedSpaces) { _shared_paths_misc_info->add_nonexist_path(path); } #endif return false; } } void ClassLoader::print_bootclasspath() { ClassPathEntry* e; tty->print("[bootclasspath= "); // Print --patch-module module/path specifications first if (_patch_mod_entries != NULL) { ResourceMark rm; int num_of_entries = _patch_mod_entries->length(); for (int i = 0; i < num_of_entries; i++) { ModuleClassPathList* mpl = _patch_mod_entries->at(i); tty->print("%s=", mpl->module_name()->as_C_string()); e = mpl->module_first_entry(); while (e != NULL) { tty->print("%s", e->name()); e = e->next(); if (e != NULL) { tty->print("%s", os::path_separator()); } } tty->print(" ;"); } } e = _first_entry; while (e != NULL) { tty->print("%s ;", e->name()); e = e->next(); } tty->print_cr("]"); } void ClassLoader::load_zip_library() { assert(ZipOpen == NULL, "should not load zip library twice"); // First make sure native library is loaded os::native_java_library(); // Load zip library char path[JVM_MAXPATHLEN]; char ebuf[1024]; void* handle = NULL; if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { handle = os::dll_load(path, ebuf, sizeof ebuf); } if (handle == NULL) { vm_exit_during_initialization("Unable to load ZIP library", path); } // Lookup zip entry points ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL || Crc32 == NULL) { vm_exit_during_initialization("Corrupted ZIP library", path); } if (ZipInflateFully == NULL) { vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); } // Lookup canonicalize entry in libjava.dll void *javalib_handle = os::native_java_library(); CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); // This lookup only works on 1.3. Do not check for non-null here } void ClassLoader::load_jimage_library() { // First make sure native library is loaded os::native_java_library(); // Load jimage library char path[JVM_MAXPATHLEN]; char ebuf[1024]; void* handle = NULL; if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { handle = os::dll_load(path, ebuf, sizeof ebuf); } if (handle == NULL) { vm_exit_during_initialization("Unable to load jimage library", path); } // Lookup jimage entry points JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); } jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); } 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); } #if INCLUDE_CDS void ClassLoader::initialize_module_loader_map(JImageFile* jimage) { if (!DumpSharedSpaces) { return; // only needed for CDS dump time } ResourceMark rm; jlong size; JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size); if (location == 0) { vm_exit_during_initialization( "Cannot find ModuleLoaderMap location from modules jimage.", NULL); } char* buffer = NEW_RESOURCE_ARRAY(char, size + 1); buffer[size] = '\0'; jlong read = (*JImageGetResource)(jimage, location, buffer, size); if (read != size) { vm_exit_during_initialization( "Cannot find ModuleLoaderMap resource from modules jimage.", NULL); } char* char_buf = (char*)buffer; int buflen = (int)strlen(char_buf); char* begin_ptr = char_buf; char* end_ptr = strchr(begin_ptr, '\n'); bool process_boot_modules = false; _boot_modules_array = new (ResourceObj::C_HEAP, mtModule) GrowableArray(INITIAL_BOOT_MODULES_ARRAY_SIZE, true); _platform_modules_array = new (ResourceObj::C_HEAP, mtModule) GrowableArray(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true); while (end_ptr != NULL && (end_ptr - char_buf) < buflen) { // Allocate a buffer from the C heap to be appended to the _boot_modules_array // or the _platform_modules_array. char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal); strncpy(temp_name, begin_ptr, end_ptr - begin_ptr); temp_name[end_ptr - begin_ptr] = '\0'; if (strncmp(temp_name, "BOOT", 4) == 0) { process_boot_modules = true; FREE_C_HEAP_ARRAY(char, temp_name); } else if (strncmp(temp_name, "PLATFORM", 8) == 0) { process_boot_modules = false; FREE_C_HEAP_ARRAY(char, temp_name); } else { // module name if (process_boot_modules) { _boot_modules_array->append(temp_name); } else { _platform_modules_array->append(temp_name); } } begin_ptr = ++end_ptr; end_ptr = strchr(begin_ptr, '\n'); } } #endif // Function add_package extracts the package from the fully qualified class name // and checks if the package is in the boot loader's package entry table. If so, // then it sets the classpath_index in the package entry record. // // The classpath_index field is used to find the entry on the boot loader class // path for packages with classes loaded by the boot loader from -Xbootclasspath/a // in an unnamed module. It is also used to indicate (for all packages whose // classes are loaded by the boot loader) that at least one of the package's // classes has been loaded. bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { assert(fullq_class_name != NULL, "just checking"); // Get package name from fully qualified class name. ResourceMark rm; const char *cp = package_from_name(fullq_class_name); if (cp != NULL) { PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); if (pkg_entry != NULL) { assert(classpath_index != -1, "Unexpected classpath_index"); pkg_entry->set_classpath_index(classpath_index); } else { return false; } } return true; } oop ClassLoader::get_system_package(const char* name, TRAPS) { // Look up the name in the boot loader's package entry table. if (name != NULL) { TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); // Look for the package entry in the boot loader's package entry table. PackageEntry* package = ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); // Return NULL if package does not exist or if no classes in that package // have been loaded. if (package != NULL && package->has_loaded_class()) { ModuleEntry* module = package->module(); if (module->location() != NULL) { ResourceMark rm(THREAD); Handle ml = java_lang_String::create_from_str( module->location()->as_C_string(), THREAD); return ml(); } // Return entry on boot loader class path. Handle cph = java_lang_String::create_from_str( ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); return cph(); } } return NULL; } objArrayOop ClassLoader::get_system_packages(TRAPS) { ResourceMark rm(THREAD); // List of pointers to PackageEntrys that have loaded classes. GrowableArray* loaded_class_pkgs = new GrowableArray(50); { MutexLocker ml(Module_lock, THREAD); PackageEntryTable* pe_table = ClassLoaderData::the_null_class_loader_data()->packages(); // Collect the packages that have at least one loaded class. for (int x = 0; x < pe_table->table_size(); x++) { for (PackageEntry* package_entry = pe_table->bucket(x); package_entry != NULL; package_entry = package_entry->next()) { if (package_entry->has_loaded_class()) { loaded_class_pkgs->append(package_entry); } } } } // Allocate objArray and fill with java.lang.String objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), loaded_class_pkgs->length(), CHECK_NULL); objArrayHandle result(THREAD, r); for (int x = 0; x < loaded_class_pkgs->length(); x++) { PackageEntry* package_entry = loaded_class_pkgs->at(x); Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); result->obj_at_put(x, str()); } return result(); } #if INCLUDE_CDS s2 ClassLoader::module_to_classloader(const char* module_name) { assert(DumpSharedSpaces, "dump time only"); assert(_boot_modules_array != NULL, "_boot_modules_array is NULL"); assert(_platform_modules_array != NULL, "_platform_modules_array is NULL"); int array_size = _boot_modules_array->length(); for (int i = 0; i < array_size; i++) { if (strcmp(module_name, _boot_modules_array->at(i)) == 0) { return BOOT_LOADER; } } array_size = _platform_modules_array->length(); for (int i = 0; i < array_size; i++) { if (strcmp(module_name, _platform_modules_array->at(i)) == 0) { return PLATFORM_LOADER; } } return APP_LOADER; } s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) { assert(DumpSharedSpaces, "Only used for CDS dump time"); // obtain the classloader type based on the class name. // First obtain the package name based on the class name. Then obtain // the classloader type based on the package name from the jimage using // a jimage API. If the classloader type cannot be found from the // jimage, it is determined by the class path entry. jshort loader_type = ClassLoader::APP_LOADER; if (e->is_jrt()) { ResourceMark rm; TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0); if (pkg_name != NULL) { const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string()); ClassPathImageEntry* cpie = (ClassPathImageEntry*)e; JImageFile* jimage = cpie->jimage(); char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string); if (module_name != NULL) { loader_type = ClassLoader::module_to_classloader(module_name); } } } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) { loader_type = ClassLoader::BOOT_LOADER; } return loader_type; } #endif // caller needs ResourceMark const char* ClassLoader::file_name_for_class_name(const char* class_name, int class_name_len) { assert(class_name != NULL, "invariant"); assert((int)strlen(class_name) == class_name_len, "invariant"); static const char class_suffix[] = ".class"; char* const file_name = NEW_RESOURCE_ARRAY(char, class_name_len + sizeof(class_suffix)); // includes term NULL strncpy(file_name, class_name, class_name_len); strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); return file_name; } instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { assert(name != NULL, "invariant"); assert(THREAD->is_Java_thread(), "must be a JavaThread"); ResourceMark rm(THREAD); HandleMark hm(THREAD); const char* const class_name = name->as_C_string(); EventMark m("loading class %s", class_name); ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); const char* const file_name = file_name_for_class_name(class_name, name->utf8_length()); assert(file_name != NULL, "invariant"); ClassLoaderExt::Context context(class_name, file_name, THREAD); // Lookup stream for parsing .class file ClassFileStream* stream = NULL; s2 classpath_index = 0; ClassPathEntry* e = NULL; // If DumpSharedSpaces is true, boot loader visibility boundaries are set // to be _first_entry to the end (all path entries). No --patch-module entries are // included since CDS and AppCDS are not supported if --patch-module is specified. // // If search_append_only is true, boot loader visibility boundaries are // set to be _first_append_entry to the end. This includes: // [-Xbootclasspath/a]; [jvmti appended entries] // // If both DumpSharedSpaces and search_append_only are false, boot loader // visibility boundaries are set to be _first_entry to the entry before // the _first_append_entry. This would include: // [--patch-module==()*]; [exploded build | jimage] // // DumpSharedSpaces and search_append_only are mutually exclusive and cannot // be true at the same time. assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true"); // Load Attempt #1: --patch-module // Determine the class' defining module. If it appears in the _patch_mod_entries, // attempt to load the class from those locations specific to the module. // Note: The --patch-module entries are never searched if the boot loader's // visibility boundary is limited to only searching the append entries. if (_patch_mod_entries != NULL && !search_append_only && !DumpSharedSpaces) { // Find the module in the boot loader's module entry table PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), THREAD); ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; // If the module system has not defined java.base yet, then // classes loaded are assumed to be defined to java.base. // When java.base is eventually defined by the module system, // all packages of classes that have been previously loaded // are verified in ModuleEntryTable::verify_javabase_packages(). if (!Universe::is_module_initialized() && !ModuleEntryTable::javabase_defined() && mod_entry == NULL) { mod_entry = ModuleEntryTable::javabase_module(); } // The module must be a named module if (mod_entry != NULL && mod_entry->is_named()) { int num_of_entries = _patch_mod_entries->length(); const Symbol* class_module_name = mod_entry->name(); // Loop through all the patch_mod entries looking for module for (int i = 0; i < num_of_entries; i++) { ModuleClassPathList* module_cpl = _patch_mod_entries->at(i); Symbol* module_cpl_name = module_cpl->module_name(); if (module_cpl_name->fast_compare(class_module_name) == 0) { // Class' module has been located, attempt to load // the class from the module's ClassPathEntry list. e = module_cpl->module_first_entry(); while (e != NULL) { stream = e->open_stream(file_name, CHECK_NULL); // No context.check is required since both CDS // and AppCDS are turned off if --patch-module is specified. if (NULL != stream) { break; } e = e->next(); } // If the module was located in the patch_mod entries, break out // even if the class was not located successfully from that module's // ClassPathEntry list. There will not be another valid entry for // that module in the _patch_mod_entries array. break; } } } } // Load Attempt #2: [exploded build | jimage] if (!search_append_only && (NULL == stream)) { e = _first_entry; while ((e != NULL) && (e != _first_append_entry)) { stream = e->open_stream(file_name, CHECK_NULL); if (!context.check(stream, classpath_index)) { return NULL; } if (NULL != stream) { break; } e = e->next(); ++classpath_index; } } // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { // For the boot loader append path search, must calculate // the starting classpath_index prior to attempting to // load the classfile. if (search_append_only) { ClassPathEntry *tmp_e = _first_entry; while ((tmp_e != NULL) && (tmp_e != _first_append_entry)) { tmp_e = tmp_e->next(); ++classpath_index; } } e = _first_append_entry; while (e != NULL) { stream = e->open_stream(file_name, CHECK_NULL); if (!context.check(stream, classpath_index)) { return NULL; } if (NULL != stream) { break; } e = e->next(); ++classpath_index; } } if (NULL == stream) { if (DumpSharedSpaces) { tty->print_cr("Preload Warning: Cannot find %s", class_name); } return NULL; } stream->set_verify(context.should_verify(classpath_index)); ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); Handle protection_domain; instanceKlassHandle result = KlassFactory::create_from_stream(stream, name, loader_data, protection_domain, NULL, // host_klass NULL, // cp_patches NULL, // parsed_name THREAD); if (HAS_PENDING_EXCEPTION) { if (DumpSharedSpaces) { tty->print_cr("Preload Error: Failed to load %s", class_name); } return NULL; } return context.record_result(name, e, classpath_index, result, THREAD); } // 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() { EXCEPTION_MARK; if (UsePerfData) { // jvmstat performance counters NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); // The following performance counters are added for measuring the impact // of the bug fix of 6365597. They are mainly focused on finding out // the behavior of system & user-defined classloader lock, whether // ClassLoader.loadClass/findClass is being called synchronized or not. // Also two additional counters are created to see whether 'UnsyncloadClass' // flag is being set or not and how many times load_instance_class call // fails with linkageError etc. NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, "systemLoaderLockContentionRate"); NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, "nonSystemLoaderLockContentionRate"); NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, "jvmFindLoadedClassNoLockCalls"); NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, "jvmDefineClassNoLockCalls"); NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, "jniDefineClassNoLockCalls"); NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls"); NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, "loadInstanceClassFailRate"); // increment the isUnsyncloadClass counter if UnsyncloadClass is set. if (UnsyncloadClass) { _isUnsyncloadClass->inc(); } } // lookup zip library entry points load_zip_library(); // lookup jimage library entry points load_jimage_library(); #if INCLUDE_CDS // initialize search path if (DumpSharedSpaces) { _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); } #endif setup_bootstrap_search_path(); } #if INCLUDE_CDS void ClassLoader::initialize_shared_path() { if (DumpSharedSpaces) { ClassLoaderExt::setup_search_paths(); _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() } } #endif jlong ClassLoader::classloader_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; } jlong ClassLoader::class_init_count() { return UsePerfData ? _perf_classes_inited->get_value() : -1; } jlong ClassLoader::class_init_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; } jlong ClassLoader::class_verify_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; } jlong ClassLoader::class_link_count() { return UsePerfData ? _perf_classes_linked->get_value() : -1; } jlong ClassLoader::class_link_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; } int ClassLoader::compute_Object_vtable() { // hardwired for JDK1.2 -- would need to duplicate class file parsing // code to determine actual value from file // Would be value '11' if finals were in vtable int JDK_1_2_Object_vtable_size = 5; return JDK_1_2_Object_vtable_size * vtableEntry::size(); } void classLoader_init1() { ClassLoader::initialize(); } // Complete the ClassPathEntry setup for the boot loader void classLoader_init2() { // Setup the list of module/path pairs for --patch-module processing // This must be done after the SymbolTable is created in order // to use fast_compare on module names instead of a string compare. if (Arguments::get_patch_mod_prefix() != NULL) { ClassLoader::setup_patch_mod_entries(); } // Determine if this is an exploded build ClassLoader::set_has_jimage(); } bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { assert(orig != NULL && out != NULL && len > 0, "bad arguments"); if (CanonicalizeEntry != NULL) { JavaThread* THREAD = JavaThread::current(); JNIEnv* env = THREAD->jni_environment(); ResourceMark rm(THREAD); // os::native_path writes into orig_copy char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); strcpy(orig_copy, orig); if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { return false; } } else { // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing strncpy(out, orig, len); out[len - 1] = '\0'; } return true; } void ClassLoader::create_javabase() { Thread* THREAD = Thread::current(); // Create java.base's module entry for the boot // class loader prior to loading j.l.Ojbect. ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); // Get module entry table ModuleEntryTable* null_cld_modules = null_cld->modules(); if (null_cld_modules == NULL) { vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); } { MutexLocker ml(Module_lock, THREAD); ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld); if (jb_module == NULL) { vm_exit_during_initialization("Unable to create ModuleEntry for java.base"); } ModuleEntryTable::set_javabase_module(jb_module); } } void ClassLoader::set_has_jimage() { // Determine if this is an exploded build. When looking for // the jimage file, only search the piece of the boot // loader's boot class path which contains [exploded build | jimage]. // Do not search the boot loader's patch-module entries or append path. ClassPathEntry* e = _first_entry; ClassPathEntry* last_e = _first_append_entry; while ((e != NULL) && (e != last_e)) { JImageFile *jimage = e->jimage(); if (jimage != NULL && e->is_jrt()) { _has_jimage = true; #if INCLUDE_CDS ClassLoader::initialize_module_loader_map(jimage); #endif return; } e = e->next(); } } #ifndef PRODUCT // 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_jzentry { /* 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_jzentry; typedef struct real_jzfile { /* 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_jzfile *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_jzfile; 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(); } void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { real_jzfile* zip = (real_jzfile*) _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_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); if (ze == NULL) break; ClassLoader::compile_the_world_in(ze->name, loader, CHECK); } if (HAS_PENDING_EXCEPTION) { if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { CLEAR_PENDING_EXCEPTION; tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); tty->print_cr("Increase class metadata storage if a limit was set"); } else { tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); } } } void ClassLoader::compile_the_world() { EXCEPTION_MARK; HandleMark hm(THREAD); ResourceMark rm(THREAD); // Find bootstrap loader Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); // Iterate over all bootstrap class path entries ClassPathEntry* e = _first_entry; jlong start = os::javaTimeMillis(); while (e != NULL) { // We stop at "modules" jimage, unless it is the first bootstrap path entry if (e->is_jrt() && e != _first_entry) break; e->compile_the_world(system_class_loader, CATCH); e = e->next(); } jlong end = os::javaTimeMillis(); tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); { // Print statistics as if before normal exit: extern void print_statistics(); print_statistics(); } vm_exit(0); } int ClassLoader::_compile_the_world_class_counter = 0; int ClassLoader::_compile_the_world_method_counter = 0; static int _codecache_sweep_counter = 0; // Filter out all exceptions except OOMs static void clear_pending_exception_if_not_oom(TRAPS) { if (HAS_PENDING_EXCEPTION && !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { CLEAR_PENDING_EXCEPTION; } // The CHECK at the caller will propagate the exception out } /** * Returns if the given method should be compiled when doing compile-the-world. * * TODO: This should be a private method in a CompileTheWorld class. */ static bool can_be_compiled(methodHandle m, int comp_level) { assert(CompileTheWorld, "must be"); // It's not valid to compile a native wrapper for MethodHandle methods // that take a MemberName appendix since the bytecode signature is not // correct. vmIntrinsics::ID iid = m->intrinsic_id(); if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { return false; } return CompilationPolicy::can_be_compiled(m, comp_level); } void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { if (string_ends_with(name, ".class")) { // We have a .class file int len = (int)strlen(name); char buffer[2048]; strncpy(buffer, name, len - 6); buffer[len-6] = 0; // If the file has a period after removing .class, it's not really a // valid class file. The class loader will check everything else. if (strchr(buffer, '.') == NULL) { _compile_the_world_class_counter++; if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; // Construct name without extension TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); // Use loader to load and initialize class Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); instanceKlassHandle k (THREAD, ik); if (k.not_null() && !HAS_PENDING_EXCEPTION) { k->initialize(THREAD); } bool exception_occurred = HAS_PENDING_EXCEPTION; clear_pending_exception_if_not_oom(CHECK); if (CompileTheWorldPreloadClasses && k.not_null()) { ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); if (HAS_PENDING_EXCEPTION) { // If something went wrong in preloading we just ignore it clear_pending_exception_if_not_oom(CHECK); tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); } } if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { if (k.is_null() || exception_occurred) { // If something went wrong (e.g. ExceptionInInitializerError) we skip this class tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); } else { tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); // Preload all classes to get around uncommon traps // Iterate over all methods in class int comp_level = CompilationPolicy::policy()->initial_compile_level(); for (int n = 0; n < k->methods()->length(); n++) { methodHandle m (THREAD, k->methods()->at(n)); if (can_be_compiled(m, comp_level)) { if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { // Give sweeper a chance to keep up with CTW VM_ForceSafepoint op; VMThread::execute(&op); _codecache_sweep_counter = 0; } // Force compilation CompileBroker::compile_method(m, InvocationEntryBci, comp_level, methodHandle(), 0, CompileTask::Reason_CTW, THREAD); if (HAS_PENDING_EXCEPTION) { clear_pending_exception_if_not_oom(CHECK); tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); } else { _compile_the_world_method_counter++; } if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { // Clobber the first compile and force second tier compilation CompiledMethod* nm = m->code(); if (nm != NULL && !m->is_method_handle_intrinsic()) { // Throw out the code so that the code cache doesn't fill up nm->make_not_entrant(); m->clear_code(); } CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, methodHandle(), 0, CompileTask::Reason_CTW, THREAD); if (HAS_PENDING_EXCEPTION) { clear_pending_exception_if_not_oom(CHECK); tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); } else { _compile_the_world_method_counter++; } } } else { tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); } CompiledMethod* nm = m->code(); if (nm != NULL && !m->is_method_handle_intrinsic()) { // Throw out the code so that the code cache doesn't fill up nm->make_not_entrant(); m->clear_code(); } } } } } } } #endif //PRODUCT // Please keep following two functions at end of this file. With them placed at top or in middle of the file, // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. void PerfClassTraceTime::initialize() { if (!UsePerfData) return; if (_eventp != NULL) { // increment the event counter _eventp->inc(); } // stop the current active thread-local timer to measure inclusive time _prev_active_event = -1; for (int i=0; i < EVENT_TYPE_COUNT; i++) { if (_timers[i].is_active()) { assert(_prev_active_event == -1, "should have only one active timer"); _prev_active_event = i; _timers[i].stop(); } } if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { // start the inclusive timer if not recursively called _t.start(); } // start thread-local timer of the given event type if (!_timers[_event_type].is_active()) { _timers[_event_type].start(); } } PerfClassTraceTime::~PerfClassTraceTime() { if (!UsePerfData) return; // stop the thread-local timer as the event completes // and resume the thread-local timer of the event next on the stack _timers[_event_type].stop(); jlong selftime = _timers[_event_type].ticks(); if (_prev_active_event >= 0) { _timers[_prev_active_event].start(); } if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; // increment the counters only on the leaf call _t.stop(); _timep->inc(_t.ticks()); if (_selftimep != NULL) { _selftimep->inc(selftime); } // add all class loading related event selftime to the accumulated time counter ClassLoader::perf_accumulated_time()->inc(selftime); // reset the timer _timers[_event_type].reset(); }