hotspot/src/share/vm/classfile/classLoader.hpp
author trims
Thu, 27 May 2010 19:08:38 -0700
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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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/*
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 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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// The VM class loader.
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#include <sys/stat.h>
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// Meta-index (optional, to be able to skip opening boot classpath jar files)
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class MetaIndex: public CHeapObj {
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  char** _meta_package_names;
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  int    _num_meta_package_names;
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  MetaIndex(char** meta_package_names, int num_meta_package_names);
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  ~MetaIndex();
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  bool may_contain(const char* class_name);
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};
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// Class path entry (directory or zip file)
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class ClassPathEntry: public CHeapObj {
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  ClassPathEntry* _next;
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  // Next entry in class path
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  ClassPathEntry* next()              { return _next; }
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  void set_next(ClassPathEntry* next) {
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    // may have unlocked readers, so write atomically.
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    OrderAccess::release_store_ptr(&_next, next);
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  }
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  virtual bool is_jar_file() = 0;
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  virtual const char* name() = 0;
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  virtual bool is_lazy();
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  // Constructor
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  ClassPathEntry();
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  // Attempt to locate file_name through this class path entry.
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  // Returns a class file parsing stream if successfull.
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  virtual ClassFileStream* open_stream(const char* name) = 0;
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  // Debugging
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  NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
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  NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
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};
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class ClassPathDirEntry: public ClassPathEntry {
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  char* _dir;           // Name of directory
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  bool is_jar_file()  { return false;  }
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  const char* name()  { return _dir; }
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  ClassPathDirEntry(char* dir);
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  ClassFileStream* open_stream(const char* name);
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  // Debugging
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  NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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  NOT_PRODUCT(bool is_rt_jar();)
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};
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// Type definitions for zip file and zip file entry
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typedef void* jzfile;
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typedef struct {
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  char *name;                   /* entry name */
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  jlong time;                   /* modification time */
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  jlong size;                   /* size of uncompressed data */
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  jlong csize;                  /* size of compressed data (zero if uncompressed) */
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  jint crc;                     /* crc of uncompressed data */
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  char *comment;                /* optional zip file comment */
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  jbyte *extra;                 /* optional extra data */
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  jlong pos;                    /* position of LOC header (if negative) or data */
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} jzentry;
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class ClassPathZipEntry: public ClassPathEntry {
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  jzfile* _zip;        // The zip archive
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  char*   _zip_name;   // Name of zip archive
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  bool is_jar_file()  { return true;  }
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  const char* name()  { return _zip_name; }
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  ClassPathZipEntry(jzfile* zip, const char* zip_name);
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  ~ClassPathZipEntry();
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  ClassFileStream* open_stream(const char* name);
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  void contents_do(void f(const char* name, void* context), void* context);
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  // Debugging
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  NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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  NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
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  NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
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  NOT_PRODUCT(bool is_rt_jar();)
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  NOT_PRODUCT(bool is_rt_jar12();)
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  NOT_PRODUCT(bool is_rt_jar13();)
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};
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// For lazier loading of boot class path entries
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class LazyClassPathEntry: public ClassPathEntry {
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  char* _path; // dir or file
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  struct stat _st;
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  MetaIndex* _meta_index;
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  volatile ClassPathEntry* _resolved_entry;
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  ClassPathEntry* resolve_entry();
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  bool is_jar_file();
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  const char* name()  { return _path; }
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  LazyClassPathEntry(char* path, struct stat st);
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  ClassFileStream* open_stream(const char* name);
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  void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
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  virtual bool is_lazy();
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  // Debugging
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  NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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  NOT_PRODUCT(bool is_rt_jar();)
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};
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class PackageHashtable;
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class PackageInfo;
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class HashtableBucket;
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class ClassLoader: AllStatic {
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  enum SomeConstants {
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    package_hash_table_size = 31  // Number of buckets
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  };
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  friend class LazyClassPathEntry;
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  // Performance counters
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  static PerfCounter* _perf_accumulated_time;
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  static PerfCounter* _perf_classes_inited;
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  static PerfCounter* _perf_class_init_time;
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  static PerfCounter* _perf_class_init_selftime;
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  static PerfCounter* _perf_classes_verified;
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  static PerfCounter* _perf_class_verify_time;
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  static PerfCounter* _perf_class_verify_selftime;
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  static PerfCounter* _perf_classes_linked;
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  static PerfCounter* _perf_class_link_time;
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  static PerfCounter* _perf_class_link_selftime;
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  static PerfCounter* _perf_class_parse_time;
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  static PerfCounter* _perf_class_parse_selftime;
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  static PerfCounter* _perf_sys_class_lookup_time;
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  static PerfCounter* _perf_shared_classload_time;
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  static PerfCounter* _perf_sys_classload_time;
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  static PerfCounter* _perf_app_classload_time;
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  static PerfCounter* _perf_app_classload_selftime;
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  static PerfCounter* _perf_app_classload_count;
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  static PerfCounter* _perf_define_appclasses;
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  static PerfCounter* _perf_define_appclass_time;
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  static PerfCounter* _perf_define_appclass_selftime;
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  static PerfCounter* _perf_app_classfile_bytes_read;
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  static PerfCounter* _perf_sys_classfile_bytes_read;
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  static PerfCounter* _sync_systemLoaderLockContentionRate;
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  static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
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  static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
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  static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
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  static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
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  static PerfCounter* _unsafe_defineClassCallCounter;
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  static PerfCounter* _isUnsyncloadClass;
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  static PerfCounter* _load_instance_class_failCounter;
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  // First entry in linked list of ClassPathEntry instances
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  static ClassPathEntry* _first_entry;
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  // Last entry in linked list of ClassPathEntry instances
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  static ClassPathEntry* _last_entry;
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  // Hash table used to keep track of loaded packages
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  static PackageHashtable* _package_hash_table;
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  static const char* _shared_archive;
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  // Hash function
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  static unsigned int hash(const char *s, int n);
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  // Returns the package file name corresponding to the specified package
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  // or class name, or null if not found.
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  static PackageInfo* lookup_package(const char *pkgname);
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  // Adds a new package entry for the specified class or package name and
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  // corresponding directory or jar file name.
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  static bool add_package(const char *pkgname, int classpath_index, TRAPS);
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  // Initialization
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  static void setup_meta_index();
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  static void setup_bootstrap_search_path();
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  static void load_zip_library();
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  static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
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  // Canonicalizes path names, so strcmp will work properly. This is mainly
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  // to avoid confusing the zip library
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  static bool get_canonical_path(char* orig, char* out, int len);
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 public:
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  // Used by the kernel jvm.
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  static void update_class_path_entry_list(const char *path,
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                                           bool check_for_duplicates);
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  static void print_bootclasspath();
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  // Timing
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  static PerfCounter* perf_accumulated_time()         { return _perf_accumulated_time; }
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  static PerfCounter* perf_classes_inited()           { return _perf_classes_inited; }
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  static PerfCounter* perf_class_init_time()          { return _perf_class_init_time; }
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  static PerfCounter* perf_class_init_selftime()      { return _perf_class_init_selftime; }
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  static PerfCounter* perf_classes_verified()         { return _perf_classes_verified; }
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  static PerfCounter* perf_class_verify_time()        { return _perf_class_verify_time; }
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  static PerfCounter* perf_class_verify_selftime()    { return _perf_class_verify_selftime; }
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  static PerfCounter* perf_classes_linked()           { return _perf_classes_linked; }
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  static PerfCounter* perf_class_link_time()          { return _perf_class_link_time; }
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  static PerfCounter* perf_class_link_selftime()      { return _perf_class_link_selftime; }
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  static PerfCounter* perf_class_parse_time()         { return _perf_class_parse_time; }
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  static PerfCounter* perf_class_parse_selftime()     { return _perf_class_parse_selftime; }
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  static PerfCounter* perf_sys_class_lookup_time()    { return _perf_sys_class_lookup_time; }
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  static PerfCounter* perf_shared_classload_time()    { return _perf_shared_classload_time; }
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  static PerfCounter* perf_sys_classload_time()       { return _perf_sys_classload_time; }
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  static PerfCounter* perf_app_classload_time()       { return _perf_app_classload_time; }
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  static PerfCounter* perf_app_classload_selftime()   { return _perf_app_classload_selftime; }
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  static PerfCounter* perf_app_classload_count()      { return _perf_app_classload_count; }
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  static PerfCounter* perf_define_appclasses()        { return _perf_define_appclasses; }
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  static PerfCounter* perf_define_appclass_time()     { return _perf_define_appclass_time; }
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  static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
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  static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
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  static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
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  // Record how often system loader lock object is contended
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  static PerfCounter* sync_systemLoaderLockContentionRate() {
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    return _sync_systemLoaderLockContentionRate;
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  }
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  // Record how often non system loader lock object is contended
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  static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
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    return _sync_nonSystemLoaderLockContentionRate;
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  }
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  // Record how many calls to JVM_FindLoadedClass w/o holding a lock
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  static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
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    return _sync_JVMFindLoadedClassLockFreeCounter;
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  }
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  // Record how many calls to JVM_DefineClass w/o holding a lock
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  static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
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    return _sync_JVMDefineClassLockFreeCounter;
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  }
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  // Record how many calls to jni_DefineClass w/o holding a lock
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  static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
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    return _sync_JNIDefineClassLockFreeCounter;
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  }
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  // Record how many calls to Unsafe_DefineClass
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  static PerfCounter* unsafe_defineClassCallCounter() {
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    return _unsafe_defineClassCallCounter;
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  }
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  // Record how many times SystemDictionary::load_instance_class call
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  // fails with linkageError when Unsyncloadclass flag is set.
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  static PerfCounter* load_instance_class_failCounter() {
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    return _load_instance_class_failCounter;
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  }
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  // Load individual .class file
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  static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
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  // If the specified package has been loaded by the system, then returns
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  // the name of the directory or ZIP file that the package was loaded from.
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  // Returns null if the package was not loaded.
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  // Note: The specified name can either be the name of a class or package.
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  // If a package name is specified, then it must be "/"-separator and also
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  // end with a trailing "/".
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  static oop get_system_package(const char* name, TRAPS);
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  // Returns an array of Java strings representing all of the currently
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  // loaded system packages.
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  // Note: The package names returned are "/"-separated and end with a
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  // trailing "/".
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  static objArrayOop get_system_packages(TRAPS);
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  // Initialization
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  static void initialize();
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  static void create_package_info_table();
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  static void create_package_info_table(HashtableBucket *t, int length,
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                                        int number_of_entries);
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  static int compute_Object_vtable();
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  static ClassPathEntry* classpath_entry(int n) {
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    ClassPathEntry* e = ClassLoader::_first_entry;
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    while (--n >= 0) {
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      assert(e != NULL, "Not that many classpath entries.");
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      e = e->next();
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    }
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    return e;
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  }
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  // Sharing dump and restore
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  static void copy_package_info_buckets(char** top, char* end);
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  static void copy_package_info_table(char** top, char* end);
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  // VM monitoring and management support
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  static jlong classloader_time_ms();
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  static jlong class_method_total_size();
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  static jlong class_init_count();
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  static jlong class_init_time_ms();
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  static jlong class_verify_time_ms();
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  static jlong class_link_count();
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  static jlong class_link_time_ms();
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  // indicates if class path already contains a entry (exact match by name)
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  static bool contains_entry(ClassPathEntry* entry);
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  // adds a class path list
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  static void add_to_list(ClassPathEntry* new_entry);
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  // creates a class path zip entry (returns NULL if JAR file cannot be opened)
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  static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
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  // Debugging
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  static void verify()              PRODUCT_RETURN;
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  // Force compilation of all methods in all classes in bootstrap class path (stress test)
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#ifndef PRODUCT
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 private:
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  static int _compile_the_world_counter;
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 public:
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  static void compile_the_world();
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  static void compile_the_world_in(char* name, Handle loader, TRAPS);
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  static int  compile_the_world_counter() { return _compile_the_world_counter; }
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#endif //PRODUCT
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};
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// PerfClassTraceTime is used to measure time for class loading related events.
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// This class tracks cumulative time and exclusive time for specific event types.
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// During the execution of one event, other event types (e.g. class loading and
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// resolution) as well as recursive calls of the same event type could happen.
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// Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
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// (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
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// instances have been created as multiple events are happening.
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class PerfClassTraceTime {
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  public:
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    enum {
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       CLASS_LOAD   = 0,
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       PARSE_CLASS  = 1,
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       CLASS_LINK   = 2,
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       CLASS_VERIFY = 3,
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       CLASS_CLINIT = 4,
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       DEFINE_CLASS = 5,
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       EVENT_TYPE_COUNT = 6
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    };
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  protected:
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    // _t tracks time from initialization to destruction of this timer instance
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    // including time for all other event types, and recursive calls of this type.
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    // When a timer is called recursively, the elapsedTimer _t would not be used.
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    elapsedTimer     _t;
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    PerfLongCounter* _timep;
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    PerfLongCounter* _selftimep;
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    PerfLongCounter* _eventp;
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    // pointer to thread-local recursion counter and timer array
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    // The thread_local timers track cumulative time for specific event types
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    // exclusive of time for other event types, but including recursive calls
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    // of the same type.
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    int*             _recursion_counters;
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    elapsedTimer*    _timers;
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    int              _event_type;
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    int              _prev_active_event;
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   379
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  public:
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   381
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    inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
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                              PerfLongCounter* selftimep, /* counter incremented with exclusive time */
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                              PerfLongCounter* eventp,    /* event counter */
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                              int* recursion_counters,    /* thread-local recursion counter array */
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                              elapsedTimer* timers,       /* thread-local timer array */
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                              int type                    /* event type */ ) :
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        _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
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      initialize();
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    }
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   391
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    inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
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                              elapsedTimer* timers,       /* thread-local timer array */
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                              int type                    /* event type */ ) :
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        _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
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      initialize();
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    }
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   398
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   399
    void initialize() {
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      if (!UsePerfData) return;
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   401
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      if (_eventp != NULL) {
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        // increment the event counter
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        _eventp->inc();
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      }
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   406
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      // stop the current active thread-local timer to measure inclusive time
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      _prev_active_event = -1;
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      for (int i=0; i < EVENT_TYPE_COUNT; i++) {
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         if (_timers[i].is_active()) {
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           assert(_prev_active_event == -1, "should have only one active timer");
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           _prev_active_event = i;
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           _timers[i].stop();
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   414
         }
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      }
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   416
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      if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
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        // start the inclusive timer if not recursively called
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        _t.start();
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   420
      }
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   421
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      // start thread-local timer of the given event type
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      if (!_timers[_event_type].is_active()) {
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        _timers[_event_type].start();
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      }
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   426
    }
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   427
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   428
    inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
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    inline void resume()  { _t.start(); _timers[_event_type].start(); }
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   430
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    ~PerfClassTraceTime() {
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      if (!UsePerfData) return;
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   433
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   434
      // stop the thread-local timer as the event completes
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      // and resume the thread-local timer of the event next on the stack
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      _timers[_event_type].stop();
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      jlong selftime = _timers[_event_type].ticks();
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   438
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   439
      if (_prev_active_event >= 0) {
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        _timers[_prev_active_event].start();
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   441
      }
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   442
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      if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
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   444
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      // increment the counters only on the leaf call
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      _t.stop();
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      _timep->inc(_t.ticks());
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      if (_selftimep != NULL) {
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        _selftimep->inc(selftime);
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   450
      }
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      // add all class loading related event selftime to the accumulated time counter
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      ClassLoader::perf_accumulated_time()->inc(selftime);
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   453
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   454
      // reset the timer
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      _timers[_event_type].reset();
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   456
    }
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   457
};
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   458