/* * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classFileParser.hpp" #include "classfile/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/javaClasses.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "compiler/compileBroker.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "interpreter/bytecodeStream.hpp" #include "interpreter/oopMapCache.hpp" #include "memory/allocation.inline.hpp" #include "memory/generation.hpp" #include "memory/oopFactory.hpp" #include "memory/universe.inline.hpp" #include "oops/instanceKlass.hpp" #include "oops/instanceRefKlass.hpp" #include "oops/oop.inline.hpp" #include "oops/symbol.hpp" #include "prims/jvm_misc.hpp" #include "runtime/arguments.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/fprofiler.hpp" #include "runtime/handles.hpp" #include "runtime/handles.inline.hpp" #include "runtime/init.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/threadCritical.hpp" #include "runtime/timer.hpp" #include "services/management.hpp" #include "services/threadService.hpp" #include "utilities/events.hpp" #include "utilities/hashtable.hpp" #include "utilities/hashtable.inline.hpp" #ifdef TARGET_OS_FAMILY_linux # include "os_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "os_solaris.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "os_windows.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_aix # include "os_aix.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_bsd # include "os_bsd.inline.hpp" #endif // Entry points in zip.dll for loading zip/jar file entries typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); typedef void (JNICALL *ZipClose_t)(jzfile *zip); typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 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; // Globals PerfCounter* ClassLoader::_perf_accumulated_time = NULL; PerfCounter* ClassLoader::_perf_classes_inited = NULL; PerfCounter* ClassLoader::_perf_class_init_time = NULL; PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; PerfCounter* ClassLoader::_perf_classes_verified = NULL; PerfCounter* ClassLoader::_perf_class_verify_time = NULL; PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; PerfCounter* ClassLoader::_perf_classes_linked = NULL; PerfCounter* ClassLoader::_perf_class_link_time = NULL; PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; PerfCounter* ClassLoader::_perf_class_parse_time = NULL; PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; PerfCounter* ClassLoader::_perf_app_classload_time = NULL; PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; PerfCounter* ClassLoader::_perf_app_classload_count = NULL; PerfCounter* ClassLoader::_perf_define_appclasses = NULL; PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; ClassPathEntry* ClassLoader::_first_entry = NULL; ClassPathEntry* ClassLoader::_last_entry = NULL; PackageHashtable* ClassLoader::_package_hash_table = NULL; // helper routines bool string_starts_with(const char* str, const char* str_to_find) { size_t str_len = strlen(str); size_t str_to_find_len = strlen(str_to_find); if (str_to_find_len > str_len) { return false; } return (strncmp(str, str_to_find, str_to_find_len) == 0); } bool string_ends_with(const char* str, const char* str_to_find) { size_t str_len = strlen(str); size_t str_to_find_len = strlen(str_to_find); if (str_to_find_len > str_len) { return false; } return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); } MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) { if (num_meta_package_names == 0) { _meta_package_names = NULL; _num_meta_package_names = 0; } else { _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass); _num_meta_package_names = num_meta_package_names; memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*)); } } MetaIndex::~MetaIndex() { FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass); } bool MetaIndex::may_contain(const char* class_name) { if ( _num_meta_package_names == 0) { return false; } size_t class_name_len = strlen(class_name); for (int i = 0; i < _num_meta_package_names; i++) { char* pkg = _meta_package_names[i]; size_t pkg_len = strlen(pkg); size_t min_len = MIN2(class_name_len, pkg_len); if (!strncmp(class_name, pkg, min_len)) { return true; } } return false; } ClassPathEntry::ClassPathEntry() { set_next(NULL); } bool ClassPathEntry::is_lazy() { return false; } ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() { _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); strcpy(_dir, dir); } ClassFileStream* ClassPathDirEntry::open_stream(const char* name) { // construct full path name char path[JVM_MAXPATHLEN]; if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) { return NULL; } // check if file exists struct stat st; if (os::stat(path, &st) == 0) { // found file, open it int file_handle = os::open(path, 0, 0); if (file_handle != -1) { // read contents into resource array u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); // close file os::close(file_handle); // construct ClassFileStream if (num_read == (size_t)st.st_size) { if (UsePerfData) { ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); } return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated } } } return NULL; } ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { _zip = zip; _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); strcpy(_zip_name, zip_name); } ClassPathZipEntry::~ClassPathZipEntry() { if (ZipClose != NULL) { (*ZipClose)(_zip); } FREE_C_HEAP_ARRAY(char, _zip_name, mtClass); } ClassFileStream* ClassPathZipEntry::open_stream(const char* name) { // enable call to C land JavaThread* thread = JavaThread::current(); ThreadToNativeFromVM ttn(thread); // check whether zip archive contains name jint filesize, 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 class in mmaped jar file. if (ReadMappedEntry == NULL || !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { // mmaped access not available, perhaps due to compression, // read contents into resource array buffer = NEW_RESOURCE_ARRAY(u1, filesize); if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; } if (UsePerfData) { ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); } // return result return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated } // invoke function for each entry in the zip file void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { JavaThread* thread = JavaThread::current(); HandleMark handle_mark(thread); ThreadToNativeFromVM ttn(thread); for (int n = 0; ; n++) { jzentry * ze = ((*GetNextEntry)(_zip, n)); if (ze == NULL) break; (*f)(ze->name, context); } } LazyClassPathEntry::LazyClassPathEntry(char* path, struct stat st) : ClassPathEntry() { _path = strdup(path); _st = st; _meta_index = NULL; _resolved_entry = NULL; } bool LazyClassPathEntry::is_jar_file() { return ((_st.st_mode & S_IFREG) == S_IFREG); } ClassPathEntry* LazyClassPathEntry::resolve_entry() { if (_resolved_entry != NULL) { return (ClassPathEntry*) _resolved_entry; } ClassPathEntry* new_entry = NULL; ClassLoader::create_class_path_entry(_path, _st, &new_entry, false); assert(new_entry != NULL, "earlier code should have caught this"); { ThreadCritical tc; if (_resolved_entry == NULL) { _resolved_entry = new_entry; return new_entry; } } assert(_resolved_entry != NULL, "bug in MT-safe resolution logic"); delete new_entry; return (ClassPathEntry*) _resolved_entry; } ClassFileStream* LazyClassPathEntry::open_stream(const char* name) { if (_meta_index != NULL && !_meta_index->may_contain(name)) { return NULL; } return resolve_entry()->open_stream(name); } bool LazyClassPathEntry::is_lazy() { return true; } static void print_meta_index(LazyClassPathEntry* entry, GrowableArray& meta_packages) { tty->print("[Meta index for %s=", entry->name()); for (int i = 0; i < meta_packages.length(); i++) { if (i > 0) tty->print(" "); tty->print(meta_packages.at(i)); } tty->print_cr("]"); } void ClassLoader::setup_meta_index() { // Set up meta index which allows us to open boot jars lazily if // class data sharing is enabled const char* known_version = "% VERSION 2"; char* meta_index_path = Arguments::get_meta_index_path(); char* meta_index_dir = Arguments::get_meta_index_dir(); FILE* file = fopen(meta_index_path, "r"); int line_no = 0; if (file != NULL) { ResourceMark rm; LazyClassPathEntry* cur_entry = NULL; GrowableArray boot_class_path_packages(10); char package_name[256]; bool skipCurrentJar = false; while (fgets(package_name, sizeof(package_name), file) != NULL) { ++line_no; // Remove trailing newline package_name[strlen(package_name) - 1] = '\0'; switch(package_name[0]) { case '%': { if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) { if (TraceClassLoading && Verbose) { tty->print("[Unsupported meta index version]"); } fclose(file); return; } } // These directives indicate jar files which contain only // classes, only non-classfile resources, or a combination of // the two. See src/share/classes/sun/misc/MetaIndex.java and // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE // workspace. case '#': case '!': case '@': { // Hand off current packages to current lazy entry (if any) if ((cur_entry != NULL) && (boot_class_path_packages.length() > 0)) { if (TraceClassLoading && Verbose) { print_meta_index(cur_entry, boot_class_path_packages); } MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), boot_class_path_packages.length()); cur_entry->set_meta_index(index); } cur_entry = NULL; boot_class_path_packages.clear(); // Find lazy entry corresponding to this jar file for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) { if (entry->is_lazy() && string_starts_with(entry->name(), meta_index_dir) && string_ends_with(entry->name(), &package_name[2])) { cur_entry = (LazyClassPathEntry*) entry; break; } } // If the first character is '@', it indicates the following jar // file is a resource only jar file in which case, we should skip // reading the subsequent entries since the resource loading is // totally handled by J2SE side. if (package_name[0] == '@') { if (cur_entry != NULL) { cur_entry->set_meta_index(new MetaIndex(NULL, 0)); } cur_entry = NULL; skipCurrentJar = true; } else { skipCurrentJar = false; } break; } default: { if (!skipCurrentJar && cur_entry != NULL) { char* new_name = strdup(package_name); boot_class_path_packages.append(new_name); } } } } // Hand off current packages to current lazy entry (if any) if ((cur_entry != NULL) && (boot_class_path_packages.length() > 0)) { if (TraceClassLoading && Verbose) { print_meta_index(cur_entry, boot_class_path_packages); } MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), boot_class_path_packages.length()); cur_entry->set_meta_index(index); } fclose(file); } } void ClassLoader::setup_bootstrap_search_path() { assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); char* sys_class_path = os::strdup(Arguments::get_sysclasspath()); if (TraceClassLoading && Verbose) { tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path); } int len = (int)strlen(sys_class_path); int end = 0; // Iterate over class path entries for (int start = 0; start < len; start = end) { while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) { end++; } char* path = NEW_C_HEAP_ARRAY(char, end-start+1, mtClass); strncpy(path, &sys_class_path[start], end-start); path[end-start] = '\0'; update_class_path_entry_list(path, false); FREE_C_HEAP_ARRAY(char, path, mtClass); while (sys_class_path[end] == os::path_separator()[0]) { end++; } } } void ClassLoader::create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy) { JavaThread* thread = JavaThread::current(); if (lazy) { *new_entry = new LazyClassPathEntry(path, st); return; } if ((st.st_mode & S_IFREG) == S_IFREG) { // Regular file, should be a zip file // Canonicalized filename char canonical_path[JVM_MAXPATHLEN]; if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { // This matches the classic VM EXCEPTION_MARK; THROW_MSG(vmSymbols::java_io_IOException(), "Bad pathname"); } char* error_msg = NULL; jzfile* zip; { // enable call to C land ThreadToNativeFromVM ttn(thread); HandleMark hm(thread); zip = (*ZipOpen)(canonical_path, &error_msg); } if (zip != NULL && error_msg == NULL) { *new_entry = new ClassPathZipEntry(zip, path); if (TraceClassLoading) { tty->print_cr("[Opened %s]", path); } } else { ResourceMark rm(thread); char *msg; if (error_msg == NULL) { msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ; jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); } else { int len = (int)(strlen(path) + strlen(error_msg) + 128); msg = NEW_RESOURCE_ARRAY(char, len); ; jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); } EXCEPTION_MARK; THROW_MSG(vmSymbols::java_lang_ClassNotFoundException(), msg); } } else { // Directory *new_entry = new ClassPathDirEntry(path); if (TraceClassLoading) { tty->print_cr("[Path %s]", path); } } } // Create a class path zip entry for a given path (return NULL if not found // or zip/JAR file cannot be opened) ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { // check for a regular file struct stat st; if (os::stat(path, &st) == 0) { if ((st.st_mode & S_IFREG) == S_IFREG) { char orig_path[JVM_MAXPATHLEN]; char canonical_path[JVM_MAXPATHLEN]; strcpy(orig_path, path); if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) { char* error_msg = NULL; jzfile* zip; { // enable call to C land JavaThread* thread = JavaThread::current(); ThreadToNativeFromVM ttn(thread); HandleMark hm(thread); zip = (*ZipOpen)(canonical_path, &error_msg); } if (zip != NULL && error_msg == NULL) { // create using canonical path return new ClassPathZipEntry(zip, canonical_path); } } } } return NULL; } // returns true if entry already on class path bool ClassLoader::contains_entry(ClassPathEntry *entry) { ClassPathEntry* e = _first_entry; while (e != NULL) { // assume zip entries have been canonicalized if (strcmp(entry->name(), e->name()) == 0) { return true; } e = e->next(); } return false; } void ClassLoader::add_to_list(ClassPathEntry *new_entry) { if (new_entry != NULL) { if (_last_entry == NULL) { _first_entry = _last_entry = new_entry; } else { _last_entry->set_next(new_entry); _last_entry = new_entry; } } } void ClassLoader::update_class_path_entry_list(const char *path, bool check_for_duplicates) { struct stat st; if (os::stat((char *)path, &st) == 0) { // File or directory found ClassPathEntry* new_entry = NULL; create_class_path_entry((char *)path, st, &new_entry, LazyBootClassLoader); // The kernel VM adds dynamically to the end of the classloader path and // doesn't reorder the bootclasspath which would break java.lang.Package // (see PackageInfo). // Add new entry to linked list if (!check_for_duplicates || !contains_entry(new_entry)) { add_to_list(new_entry); } } } void ClassLoader::print_bootclasspath() { ClassPathEntry* e = _first_entry; tty->print("[bootclasspath= "); while (e != NULL) { tty->print("%s ;", e->name()); e = e->next(); } tty->print_cr("]"); } void ClassLoader::load_zip_library() { assert(ZipOpen == NULL, "should not load zip library twice"); // First make sure native library is loaded os::native_java_library(); // Load zip library char path[JVM_MAXPATHLEN]; char ebuf[1024]; void* handle = NULL; if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { handle = os::dll_load(path, ebuf, sizeof ebuf); } if (handle == NULL) { vm_exit_during_initialization("Unable to load ZIP library", path); } // Lookup zip entry points ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); // 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) { vm_exit_during_initialization("Corrupted ZIP library", path); } // Lookup canonicalize entry in libjava.dll void *javalib_handle = os::native_java_library(); CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); // This lookup only works on 1.3. Do not check for non-null here } // PackageInfo data exists in order to support the java.lang.Package // class. A Package object provides information about a java package // (version, vendor, etc.) which originates in the manifest of the jar // file supplying the package. For application classes, the ClassLoader // object takes care of this. // For system (boot) classes, the Java code in the Package class needs // to be able to identify which source jar file contained the boot // class, so that it can extract the manifest from it. This table // identifies java packages with jar files in the boot classpath. // Because the boot classpath cannot change, the classpath index is // sufficient to identify the source jar file or directory. (Since // directories have no manifests, the directory name is not required, // but is available.) // When using sharing -- the pathnames of entries in the boot classpath // may not be the same at runtime as they were when the archive was // created (NFS, Samba, etc.). The actual files and directories named // in the classpath must be the same files, in the same order, even // though the exact name is not the same. class PackageInfo: public BasicHashtableEntry { public: const char* _pkgname; // Package name int _classpath_index; // Index of directory or JAR file loaded from PackageInfo* next() { return (PackageInfo*)BasicHashtableEntry::next(); } const char* pkgname() { return _pkgname; } void set_pkgname(char* pkgname) { _pkgname = pkgname; } const char* filename() { return ClassLoader::classpath_entry(_classpath_index)->name(); } void set_index(int index) { _classpath_index = index; } }; class PackageHashtable : public BasicHashtable { private: inline unsigned int compute_hash(const char *s, int n) { unsigned int val = 0; while (--n >= 0) { val = *s++ + 31 * val; } return val; } PackageInfo* bucket(int index) { return (PackageInfo*)BasicHashtable::bucket(index); } PackageInfo* get_entry(int index, unsigned int hash, const char* pkgname, size_t n) { for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) { if (pp->hash() == hash && strncmp(pkgname, pp->pkgname(), n) == 0 && pp->pkgname()[n] == '\0') { return pp; } } return NULL; } public: PackageHashtable(int table_size) : BasicHashtable(table_size, sizeof(PackageInfo)) {} PackageHashtable(int table_size, HashtableBucket* t, int number_of_entries) : BasicHashtable(table_size, sizeof(PackageInfo), t, number_of_entries) {} PackageInfo* get_entry(const char* pkgname, int n) { unsigned int hash = compute_hash(pkgname, n); return get_entry(hash_to_index(hash), hash, pkgname, n); } PackageInfo* new_entry(char* pkgname, int n) { unsigned int hash = compute_hash(pkgname, n); PackageInfo* pp; pp = (PackageInfo*)BasicHashtable::new_entry(hash); pp->set_pkgname(pkgname); return pp; } void add_entry(PackageInfo* pp) { int index = hash_to_index(pp->hash()); BasicHashtable::add_entry(index, pp); } void copy_pkgnames(const char** packages) { int n = 0; for (int i = 0; i < table_size(); ++i) { for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) { packages[n++] = pp->pkgname(); } } assert(n == number_of_entries(), "just checking"); } void copy_table(char** top, char* end, PackageHashtable* table); }; void PackageHashtable::copy_table(char** top, char* end, PackageHashtable* table) { // Copy (relocate) the table to the shared space. BasicHashtable::copy_table(top, end); // Calculate the space needed for the package name strings. int i; int n = 0; for (i = 0; i < table_size(); ++i) { for (PackageInfo* pp = table->bucket(i); pp != NULL; pp = pp->next()) { n += (int)(strlen(pp->pkgname()) + 1); } } if (*top + n + sizeof(intptr_t) >= end) { report_out_of_shared_space(SharedMiscData); } // Copy the table data (the strings) to the shared space. n = align_size_up(n, sizeof(HeapWord)); *(intptr_t*)(*top) = n; *top += sizeof(intptr_t); for (i = 0; i < table_size(); ++i) { for (PackageInfo* pp = table->bucket(i); pp != NULL; pp = pp->next()) { int n1 = (int)(strlen(pp->pkgname()) + 1); pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1)); *top += n1; } } *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord)); } void ClassLoader::copy_package_info_buckets(char** top, char* end) { _package_hash_table->copy_buckets(top, end); } void ClassLoader::copy_package_info_table(char** top, char* end) { _package_hash_table->copy_table(top, end, _package_hash_table); } PackageInfo* ClassLoader::lookup_package(const char *pkgname) { const char *cp = strrchr(pkgname, '/'); if (cp != NULL) { // Package prefix found int n = cp - pkgname + 1; return _package_hash_table->get_entry(pkgname, n); } return NULL; } bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) { assert(pkgname != NULL, "just checking"); // Bootstrap loader no longer holds system loader lock obj serializing // load_instance_class and thereby add_package { MutexLocker ml(PackageTable_lock, THREAD); // First check for previously loaded entry PackageInfo* pp = lookup_package(pkgname); if (pp != NULL) { // Existing entry found, check source of package pp->set_index(classpath_index); return true; } const char *cp = strrchr(pkgname, '/'); if (cp != NULL) { // Package prefix found int n = cp - pkgname + 1; char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass); if (new_pkgname == NULL) { return false; } memcpy(new_pkgname, pkgname, n); new_pkgname[n] = '\0'; pp = _package_hash_table->new_entry(new_pkgname, n); pp->set_index(classpath_index); // Insert into hash table _package_hash_table->add_entry(pp); } return true; } } oop ClassLoader::get_system_package(const char* name, TRAPS) { PackageInfo* pp; { MutexLocker ml(PackageTable_lock, THREAD); pp = lookup_package(name); } if (pp == NULL) { return NULL; } else { Handle p = java_lang_String::create_from_str(pp->filename(), THREAD); return p(); } } objArrayOop ClassLoader::get_system_packages(TRAPS) { ResourceMark rm(THREAD); int nof_entries; const char** packages; { MutexLocker ml(PackageTable_lock, THREAD); // Allocate resource char* array containing package names nof_entries = _package_hash_table->number_of_entries(); if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) { return NULL; } _package_hash_table->copy_pkgnames(packages); } // Allocate objArray and fill with java.lang.String objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), nof_entries, CHECK_0); objArrayHandle result(THREAD, r); for (int i = 0; i < nof_entries; i++) { Handle str = java_lang_String::create_from_str(packages[i], CHECK_0); result->obj_at_put(i, str()); } return result(); } instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) { ResourceMark rm(THREAD); EventMark m("loading class %s", h_name->as_C_string()); ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); stringStream st; // st.print() uses too much stack space while handling a StackOverflowError // st.print("%s.class", h_name->as_utf8()); st.print_raw(h_name->as_utf8()); st.print_raw(".class"); char* name = st.as_string(); // Lookup stream for parsing .class file ClassFileStream* stream = NULL; int classpath_index = 0; { PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), PerfClassTraceTime::CLASS_LOAD); ClassPathEntry* e = _first_entry; while (e != NULL) { stream = e->open_stream(name); if (stream != NULL) { break; } e = e->next(); ++classpath_index; } } instanceKlassHandle h; if (stream != NULL) { // class file found, parse it ClassFileParser parser(stream); ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); Handle protection_domain; TempNewSymbol parsed_name = NULL; instanceKlassHandle result = parser.parseClassFile(h_name, loader_data, protection_domain, parsed_name, false, CHECK_(h)); // add to package table if (add_package(name, classpath_index, THREAD)) { h = result; } } return h; } void ClassLoader::create_package_info_table(HashtableBucket *t, int length, int number_of_entries) { assert(_package_hash_table == NULL, "One package info table allowed."); assert(length == package_hash_table_size * sizeof(HashtableBucket), "bad shared package info size."); _package_hash_table = new PackageHashtable(package_hash_table_size, t, number_of_entries); } void ClassLoader::create_package_info_table() { assert(_package_hash_table == NULL, "shouldn't have one yet"); _package_hash_table = new PackageHashtable(package_hash_table_size); } // Initialize the class loader's access to methods in libzip. Parse and // process the boot classpath into a list ClassPathEntry objects. Once // this list has been created, it must not change order (see class PackageInfo) // it can be appended to and is by jvmti and the kernel vm. void ClassLoader::initialize() { assert(_package_hash_table == NULL, "should have been initialized by now."); EXCEPTION_MARK; if (UsePerfData) { // jvmstat performance counters NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); // The following performance counters are added for measuring the impact // of the bug fix of 6365597. They are mainly focused on finding out // the behavior of system & user-defined classloader lock, whether // ClassLoader.loadClass/findClass is being called synchronized or not. // Also two additional counters are created to see whether 'UnsyncloadClass' // flag is being set or not and how many times load_instance_class call // fails with linkageError etc. NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, "systemLoaderLockContentionRate"); NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, "nonSystemLoaderLockContentionRate"); NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, "jvmFindLoadedClassNoLockCalls"); NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, "jvmDefineClassNoLockCalls"); NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, "jniDefineClassNoLockCalls"); NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls"); NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, "loadInstanceClassFailRate"); // increment the isUnsyncloadClass counter if UnsyncloadClass is set. if (UnsyncloadClass) { _isUnsyncloadClass->inc(); } } // lookup zip library entry points load_zip_library(); // initialize search path setup_bootstrap_search_path(); if (LazyBootClassLoader) { // set up meta index which makes boot classpath initialization lazier setup_meta_index(); } } jlong ClassLoader::classloader_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; } jlong ClassLoader::class_init_count() { return UsePerfData ? _perf_classes_inited->get_value() : -1; } jlong ClassLoader::class_init_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; } jlong ClassLoader::class_verify_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; } jlong ClassLoader::class_link_count() { return UsePerfData ? _perf_classes_linked->get_value() : -1; } jlong ClassLoader::class_link_time_ms() { return UsePerfData ? Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; } int ClassLoader::compute_Object_vtable() { // hardwired for JDK1.2 -- would need to duplicate class file parsing // code to determine actual value from file // Would be value '11' if finals were in vtable int JDK_1_2_Object_vtable_size = 5; return JDK_1_2_Object_vtable_size * vtableEntry::size(); } void classLoader_init() { ClassLoader::initialize(); } bool ClassLoader::get_canonical_path(char* orig, char* out, int len) { assert(orig != NULL && out != NULL && len > 0, "bad arguments"); if (CanonicalizeEntry != NULL) { JNIEnv* env = JavaThread::current()->jni_environment(); if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) { return false; } } else { // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing strncpy(out, orig, len); out[len - 1] = '\0'; } return true; } #ifndef PRODUCT void ClassLoader::verify() { _package_hash_table->verify(); } // CompileTheWorld // // Iterates over all class path entries and forces compilation of all methods // in all classes found. Currently, only zip/jar archives are searched. // // The classes are loaded by the Java level bootstrap class loader, and the // initializer is called. If DelayCompilationDuringStartup is true (default), // the interpreter will run the initialization code. Note that forcing // initialization in this way could potentially lead to initialization order // problems, in which case we could just force the initialization bit to be set. // We need to iterate over the contents of a zip/jar file, so we replicate the // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, // since jzfile already has a void* definition. // // Note that this is only used in debug mode. // // HotSpot integration note: // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build // JDK 1.3 version typedef struct real_jzentry13 { /* Zip file entry */ char *name; /* entry name */ jint time; /* modification time */ jint size; /* size of uncompressed data */ jint csize; /* size of compressed data (zero if uncompressed) */ jint crc; /* crc of uncompressed data */ char *comment; /* optional zip file comment */ jbyte *extra; /* optional extra data */ jint pos; /* position of LOC header (if negative) or data */ } real_jzentry13; typedef struct real_jzfile13 { /* Zip file */ char *name; /* zip file name */ jint refs; /* number of active references */ jint fd; /* open file descriptor */ void *lock; /* read lock */ char *comment; /* zip file comment */ char *msg; /* zip error message */ void *entries; /* array of hash cells */ jint total; /* total number of entries */ unsigned short *table; /* Hash chain heads: indexes into entries */ jint tablelen; /* number of hash eads */ real_jzfile13 *next; /* next zip file in search list */ jzentry *cache; /* we cache the most recently freed jzentry */ /* Information on metadata names in META-INF directory */ char **metanames; /* array of meta names (may have null names) */ jint metacount; /* number of slots in metanames array */ /* If there are any per-entry comments, they are in the comments array */ char **comments; } real_jzfile13; // JDK 1.2 version typedef struct real_jzentry12 { /* Zip file entry */ char *name; /* entry name */ jint time; /* modification time */ jint size; /* size of uncompressed data */ jint csize; /* size of compressed data (zero if uncompressed) */ jint crc; /* crc of uncompressed data */ char *comment; /* optional zip file comment */ jbyte *extra; /* optional extra data */ jint pos; /* position of LOC header (if negative) or data */ struct real_jzentry12 *next; /* next entry in hash table */ } real_jzentry12; typedef struct real_jzfile12 { /* Zip file */ char *name; /* zip file name */ jint refs; /* number of active references */ jint fd; /* open file descriptor */ void *lock; /* read lock */ char *comment; /* zip file comment */ char *msg; /* zip error message */ real_jzentry12 *entries; /* array of zip entries */ jint total; /* total number of entries */ real_jzentry12 **table; /* hash table of entries */ jint tablelen; /* number of buckets */ jzfile *next; /* next zip file in search list */ } real_jzfile12; void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { // For now we only compile all methods in all classes in zip/jar files tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); tty->cr(); } bool ClassPathDirEntry::is_rt_jar() { return false; } void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { if (JDK_Version::is_jdk12x_version()) { compile_the_world12(loader, THREAD); } else { compile_the_world13(loader, THREAD); } if (HAS_PENDING_EXCEPTION) { if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { CLEAR_PENDING_EXCEPTION; tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); tty->print_cr("Increase class metadata storage if a limit was set"); } else { tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); } } } // Version that works for JDK 1.3.x void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) { real_jzfile13* zip = (real_jzfile13*) _zip; tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); tty->cr(); // Iterate over all entries in zip file for (int n = 0; ; n++) { real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n)); if (ze == NULL) break; ClassLoader::compile_the_world_in(ze->name, loader, CHECK); } } // Version that works for JDK 1.2.x void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) { real_jzfile12* zip = (real_jzfile12*) _zip; tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); tty->cr(); // Iterate over all entries in zip file for (int n = 0; ; n++) { real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n)); if (ze == NULL) break; ClassLoader::compile_the_world_in(ze->name, loader, CHECK); } } bool ClassPathZipEntry::is_rt_jar() { if (JDK_Version::is_jdk12x_version()) { return is_rt_jar12(); } else { return is_rt_jar13(); } } // JDK 1.3 version bool ClassPathZipEntry::is_rt_jar13() { real_jzfile13* zip = (real_jzfile13*) _zip; int len = (int)strlen(zip->name); // Check whether zip name ends in "rt.jar" // This will match other archives named rt.jar as well, but this is // only used for debugging. return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0); } // JDK 1.2 version bool ClassPathZipEntry::is_rt_jar12() { real_jzfile12* zip = (real_jzfile12*) _zip; int len = (int)strlen(zip->name); // Check whether zip name ends in "rt.jar" // This will match other archives named rt.jar as well, but this is // only used for debugging. return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0); } void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) { resolve_entry()->compile_the_world(loader, CHECK); } bool LazyClassPathEntry::is_rt_jar() { return resolve_entry()->is_rt_jar(); } void ClassLoader::compile_the_world() { EXCEPTION_MARK; HandleMark hm(THREAD); ResourceMark rm(THREAD); // Make sure we don't run with background compilation BackgroundCompilation = false; // Find bootstrap loader Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); // Iterate over all bootstrap class path entries ClassPathEntry* e = _first_entry; jlong start = os::javaTimeMillis(); while (e != NULL) { // We stop at rt.jar, unless it is the first bootstrap path entry if (e->is_rt_jar() && e != _first_entry) break; e->compile_the_world(system_class_loader, CATCH); e = e->next(); } jlong end = os::javaTimeMillis(); tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, %d 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 } void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { int len = (int)strlen(name); if (len > 6 && strcmp(".class", name + len - 6) == 0) { // We have a .class file char buffer[2048]; strncpy(buffer, name, len - 6); buffer[len-6] = 0; // If the file has a period after removing .class, it's not really a // valid class file. The class loader will check everything else. if (strchr(buffer, '.') == NULL) { _compile_the_world_class_counter++; if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; // Construct name without extension TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); // Use loader to load and initialize class Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); instanceKlassHandle k (THREAD, ik); if (k.not_null() && !HAS_PENDING_EXCEPTION) { k->initialize(THREAD); } bool exception_occurred = HAS_PENDING_EXCEPTION; clear_pending_exception_if_not_oom(CHECK); if (CompileTheWorldPreloadClasses && k.not_null()) { ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); if (HAS_PENDING_EXCEPTION) { // If something went wrong in preloading we just ignore it clear_pending_exception_if_not_oom(CHECK); tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); } } if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { if (k.is_null() || exception_occurred) { // If something went wrong (e.g. ExceptionInInitializerError) we skip this class tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); } else { tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); // Preload all classes to get around uncommon traps // Iterate over all methods in class int comp_level = CompilationPolicy::policy()->initial_compile_level(); for (int n = 0; n < k->methods()->length(); n++) { methodHandle m (THREAD, k->methods()->at(n)); if (CompilationPolicy::can_be_compiled(m, comp_level)) { if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { // Give sweeper a chance to keep up with CTW VM_ForceSafepoint op; VMThread::execute(&op); _codecache_sweep_counter = 0; } // Force compilation CompileBroker::compile_method(m, InvocationEntryBci, comp_level, methodHandle(), 0, "CTW", THREAD); if (HAS_PENDING_EXCEPTION) { clear_pending_exception_if_not_oom(CHECK); tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name()->as_C_string()); } else { _compile_the_world_method_counter++; } if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { // Clobber the first compile and force second tier compilation nmethod* nm = m->code(); if (nm != NULL) { // 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, "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()->as_C_string()); } else { _compile_the_world_method_counter++; } } } nmethod* nm = m->code(); if (nm != NULL) { // 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(); }