/* * 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. * */ #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP #include "classfile/classFileParser.hpp" #include "runtime/perfData.hpp" // The VM class loader. #include // Meta-index (optional, to be able to skip opening boot classpath jar files) class MetaIndex: public CHeapObj { private: char** _meta_package_names; int _num_meta_package_names; public: MetaIndex(char** meta_package_names, int num_meta_package_names); ~MetaIndex(); bool may_contain(const char* class_name); }; // Class path entry (directory or zip file) class ClassPathEntry: public CHeapObj { private: ClassPathEntry* _next; public: // Next entry in class path ClassPathEntry* next() { return _next; } void set_next(ClassPathEntry* next) { // may have unlocked readers, so write atomically. OrderAccess::release_store_ptr(&_next, next); } virtual bool is_jar_file() = 0; virtual const char* name() = 0; virtual bool is_lazy(); // Constructor ClassPathEntry(); // Attempt to locate file_name through this class path entry. // Returns a class file parsing stream if successfull. virtual ClassFileStream* open_stream(const char* name) = 0; // Debugging NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;) NOT_PRODUCT(virtual bool is_rt_jar() = 0;) }; class ClassPathDirEntry: public ClassPathEntry { private: char* _dir; // Name of directory public: bool is_jar_file() { return false; } const char* name() { return _dir; } ClassPathDirEntry(char* dir); ClassFileStream* open_stream(const char* name); // Debugging NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) NOT_PRODUCT(bool is_rt_jar();) }; // Type definitions for zip file and zip file entry typedef void* jzfile; typedef struct { char *name; /* entry name */ jlong time; /* modification time */ jlong size; /* size of uncompressed data */ jlong 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 */ jlong pos; /* position of LOC header (if negative) or data */ } jzentry; class ClassPathZipEntry: public ClassPathEntry { private: jzfile* _zip; // The zip archive char* _zip_name; // Name of zip archive public: bool is_jar_file() { return true; } const char* name() { return _zip_name; } ClassPathZipEntry(jzfile* zip, const char* zip_name); ~ClassPathZipEntry(); ClassFileStream* open_stream(const char* name); void contents_do(void f(const char* name, void* context), void* context); // Debugging NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version NOT_PRODUCT(bool is_rt_jar();) NOT_PRODUCT(bool is_rt_jar12();) NOT_PRODUCT(bool is_rt_jar13();) }; // For lazier loading of boot class path entries class LazyClassPathEntry: public ClassPathEntry { private: char* _path; // dir or file struct stat _st; MetaIndex* _meta_index; volatile ClassPathEntry* _resolved_entry; ClassPathEntry* resolve_entry(); public: bool is_jar_file(); const char* name() { return _path; } LazyClassPathEntry(char* path, struct stat st); ClassFileStream* open_stream(const char* name); void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; } virtual bool is_lazy(); // Debugging NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) NOT_PRODUCT(bool is_rt_jar();) }; class PackageHashtable; class PackageInfo; template class HashtableBucket; class ClassLoader: AllStatic { public: enum SomeConstants { package_hash_table_size = 31 // Number of buckets }; private: friend class LazyClassPathEntry; // Performance counters static PerfCounter* _perf_accumulated_time; static PerfCounter* _perf_classes_inited; static PerfCounter* _perf_class_init_time; static PerfCounter* _perf_class_init_selftime; static PerfCounter* _perf_classes_verified; static PerfCounter* _perf_class_verify_time; static PerfCounter* _perf_class_verify_selftime; static PerfCounter* _perf_classes_linked; static PerfCounter* _perf_class_link_time; static PerfCounter* _perf_class_link_selftime; static PerfCounter* _perf_class_parse_time; static PerfCounter* _perf_class_parse_selftime; static PerfCounter* _perf_sys_class_lookup_time; static PerfCounter* _perf_shared_classload_time; static PerfCounter* _perf_sys_classload_time; static PerfCounter* _perf_app_classload_time; static PerfCounter* _perf_app_classload_selftime; static PerfCounter* _perf_app_classload_count; static PerfCounter* _perf_define_appclasses; static PerfCounter* _perf_define_appclass_time; static PerfCounter* _perf_define_appclass_selftime; static PerfCounter* _perf_app_classfile_bytes_read; static PerfCounter* _perf_sys_classfile_bytes_read; static PerfCounter* _sync_systemLoaderLockContentionRate; static PerfCounter* _sync_nonSystemLoaderLockContentionRate; static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter; static PerfCounter* _sync_JVMDefineClassLockFreeCounter; static PerfCounter* _sync_JNIDefineClassLockFreeCounter; static PerfCounter* _unsafe_defineClassCallCounter; static PerfCounter* _isUnsyncloadClass; static PerfCounter* _load_instance_class_failCounter; // First entry in linked list of ClassPathEntry instances static ClassPathEntry* _first_entry; // Last entry in linked list of ClassPathEntry instances static ClassPathEntry* _last_entry; // Hash table used to keep track of loaded packages static PackageHashtable* _package_hash_table; static const char* _shared_archive; // Hash function static unsigned int hash(const char *s, int n); // Returns the package file name corresponding to the specified package // or class name, or null if not found. static PackageInfo* lookup_package(const char *pkgname); // Adds a new package entry for the specified class or package name and // corresponding directory or jar file name. static bool add_package(const char *pkgname, int classpath_index, TRAPS); // Initialization static void setup_meta_index(); static void setup_bootstrap_search_path(); static void load_zip_library(); static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy); // Canonicalizes path names, so strcmp will work properly. This is mainly // to avoid confusing the zip library static bool get_canonical_path(char* orig, char* out, int len); public: // Used by the kernel jvm. static void update_class_path_entry_list(const char *path, bool check_for_duplicates); static void print_bootclasspath(); // Timing static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; } static PerfCounter* perf_classes_inited() { return _perf_classes_inited; } static PerfCounter* perf_class_init_time() { return _perf_class_init_time; } static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; } static PerfCounter* perf_classes_verified() { return _perf_classes_verified; } static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; } static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; } static PerfCounter* perf_classes_linked() { return _perf_classes_linked; } static PerfCounter* perf_class_link_time() { return _perf_class_link_time; } static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; } static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; } static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; } static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; } static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; } static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; } static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; } static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; } static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; } static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; } static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; } static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; } static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; } static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; } // Record how often system loader lock object is contended static PerfCounter* sync_systemLoaderLockContentionRate() { return _sync_systemLoaderLockContentionRate; } // Record how often non system loader lock object is contended static PerfCounter* sync_nonSystemLoaderLockContentionRate() { return _sync_nonSystemLoaderLockContentionRate; } // Record how many calls to JVM_FindLoadedClass w/o holding a lock static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() { return _sync_JVMFindLoadedClassLockFreeCounter; } // Record how many calls to JVM_DefineClass w/o holding a lock static PerfCounter* sync_JVMDefineClassLockFreeCounter() { return _sync_JVMDefineClassLockFreeCounter; } // Record how many calls to jni_DefineClass w/o holding a lock static PerfCounter* sync_JNIDefineClassLockFreeCounter() { return _sync_JNIDefineClassLockFreeCounter; } // Record how many calls to Unsafe_DefineClass static PerfCounter* unsafe_defineClassCallCounter() { return _unsafe_defineClassCallCounter; } // Record how many times SystemDictionary::load_instance_class call // fails with linkageError when Unsyncloadclass flag is set. static PerfCounter* load_instance_class_failCounter() { return _load_instance_class_failCounter; } // Load individual .class file static instanceKlassHandle load_classfile(Symbol* h_name, TRAPS); // If the specified package has been loaded by the system, then returns // the name of the directory or ZIP file that the package was loaded from. // Returns null if the package was not loaded. // Note: The specified name can either be the name of a class or package. // If a package name is specified, then it must be "/"-separator and also // end with a trailing "/". static oop get_system_package(const char* name, TRAPS); // Returns an array of Java strings representing all of the currently // loaded system packages. // Note: The package names returned are "/"-separated and end with a // trailing "/". static objArrayOop get_system_packages(TRAPS); // Initialization static void initialize(); static void create_package_info_table(); static void create_package_info_table(HashtableBucket *t, int length, int number_of_entries); static int compute_Object_vtable(); static ClassPathEntry* classpath_entry(int n) { ClassPathEntry* e = ClassLoader::_first_entry; while (--n >= 0) { assert(e != NULL, "Not that many classpath entries."); e = e->next(); } return e; } // Sharing dump and restore static void copy_package_info_buckets(char** top, char* end); static void copy_package_info_table(char** top, char* end); // VM monitoring and management support static jlong classloader_time_ms(); static jlong class_method_total_size(); static jlong class_init_count(); static jlong class_init_time_ms(); static jlong class_verify_time_ms(); static jlong class_link_count(); static jlong class_link_time_ms(); // indicates if class path already contains a entry (exact match by name) static bool contains_entry(ClassPathEntry* entry); // adds a class path list static void add_to_list(ClassPathEntry* new_entry); // creates a class path zip entry (returns NULL if JAR file cannot be opened) static ClassPathZipEntry* create_class_path_zip_entry(const char *apath); // Debugging static void verify() PRODUCT_RETURN; // Force compilation of all methods in all classes in bootstrap class path (stress test) #ifndef PRODUCT private: static int _compile_the_world_counter; public: static void compile_the_world(); static void compile_the_world_in(char* name, Handle loader, TRAPS); static int compile_the_world_counter() { return _compile_the_world_counter; } #endif //PRODUCT }; // PerfClassTraceTime is used to measure time for class loading related events. // This class tracks cumulative time and exclusive time for specific event types. // During the execution of one event, other event types (e.g. class loading and // resolution) as well as recursive calls of the same event type could happen. // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive) // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime // instances have been created as multiple events are happening. class PerfClassTraceTime { public: enum { CLASS_LOAD = 0, PARSE_CLASS = 1, CLASS_LINK = 2, CLASS_VERIFY = 3, CLASS_CLINIT = 4, DEFINE_CLASS = 5, EVENT_TYPE_COUNT = 6 }; protected: // _t tracks time from initialization to destruction of this timer instance // including time for all other event types, and recursive calls of this type. // When a timer is called recursively, the elapsedTimer _t would not be used. elapsedTimer _t; PerfLongCounter* _timep; PerfLongCounter* _selftimep; PerfLongCounter* _eventp; // pointer to thread-local recursion counter and timer array // The thread_local timers track cumulative time for specific event types // exclusive of time for other event types, but including recursive calls // of the same type. int* _recursion_counters; elapsedTimer* _timers; int _event_type; int _prev_active_event; public: inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ PerfLongCounter* selftimep, /* counter incremented with exclusive time */ PerfLongCounter* eventp, /* event counter */ int* recursion_counters, /* thread-local recursion counter array */ elapsedTimer* timers, /* thread-local timer array */ int type /* event type */ ) : _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) { initialize(); } inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ elapsedTimer* timers, /* thread-local timer array */ int type /* event type */ ) : _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) { initialize(); } inline void suspend() { _t.stop(); _timers[_event_type].stop(); } inline void resume() { _t.start(); _timers[_event_type].start(); } ~PerfClassTraceTime(); void initialize(); }; #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP