1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/classfile/classLoader.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,309 @@
1.4 +/*
1.5 + * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// The VM class loader.
1.29 +#include <sys/stat.h>
1.30 +
1.31 +
1.32 +// Meta-index (optional, to be able to skip opening boot classpath jar files)
1.33 +class MetaIndex: public CHeapObj {
1.34 + private:
1.35 + char** _meta_package_names;
1.36 + int _num_meta_package_names;
1.37 + public:
1.38 + MetaIndex(char** meta_package_names, int num_meta_package_names);
1.39 + ~MetaIndex();
1.40 + bool may_contain(const char* class_name);
1.41 +};
1.42 +
1.43 +
1.44 +// Class path entry (directory or zip file)
1.45 +
1.46 +class ClassPathEntry: public CHeapObj {
1.47 + private:
1.48 + ClassPathEntry* _next;
1.49 + public:
1.50 + // Next entry in class path
1.51 + ClassPathEntry* next() { return _next; }
1.52 + void set_next(ClassPathEntry* next) {
1.53 + // may have unlocked readers, so write atomically.
1.54 + OrderAccess::release_store_ptr(&_next, next);
1.55 + }
1.56 + virtual bool is_jar_file() = 0;
1.57 + virtual const char* name() = 0;
1.58 + virtual bool is_lazy();
1.59 + // Constructor
1.60 + ClassPathEntry();
1.61 + // Attempt to locate file_name through this class path entry.
1.62 + // Returns a class file parsing stream if successfull.
1.63 + virtual ClassFileStream* open_stream(const char* name) = 0;
1.64 + // Debugging
1.65 + NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
1.66 + NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
1.67 +};
1.68 +
1.69 +
1.70 +class ClassPathDirEntry: public ClassPathEntry {
1.71 + private:
1.72 + char* _dir; // Name of directory
1.73 + public:
1.74 + bool is_jar_file() { return false; }
1.75 + const char* name() { return _dir; }
1.76 + ClassPathDirEntry(char* dir);
1.77 + ClassFileStream* open_stream(const char* name);
1.78 + // Debugging
1.79 + NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
1.80 + NOT_PRODUCT(bool is_rt_jar();)
1.81 +};
1.82 +
1.83 +
1.84 +// Type definitions for zip file and zip file entry
1.85 +typedef void* jzfile;
1.86 +typedef struct {
1.87 + char *name; /* entry name */
1.88 + jlong time; /* modification time */
1.89 + jlong size; /* size of uncompressed data */
1.90 + jlong csize; /* size of compressed data (zero if uncompressed) */
1.91 + jint crc; /* crc of uncompressed data */
1.92 + char *comment; /* optional zip file comment */
1.93 + jbyte *extra; /* optional extra data */
1.94 + jlong pos; /* position of LOC header (if negative) or data */
1.95 +} jzentry;
1.96 +
1.97 +
1.98 +class ClassPathZipEntry: public ClassPathEntry {
1.99 + private:
1.100 + jzfile* _zip; // The zip archive
1.101 + char* _zip_name; // Name of zip archive
1.102 + public:
1.103 + bool is_jar_file() { return true; }
1.104 + const char* name() { return _zip_name; }
1.105 + ClassPathZipEntry(jzfile* zip, const char* zip_name);
1.106 + ~ClassPathZipEntry();
1.107 + ClassFileStream* open_stream(const char* name);
1.108 + void contents_do(void f(const char* name, void* context), void* context);
1.109 + // Debugging
1.110 + NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
1.111 + NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
1.112 + NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
1.113 + NOT_PRODUCT(bool is_rt_jar();)
1.114 + NOT_PRODUCT(bool is_rt_jar12();)
1.115 + NOT_PRODUCT(bool is_rt_jar13();)
1.116 +};
1.117 +
1.118 +
1.119 +// For lazier loading of boot class path entries
1.120 +class LazyClassPathEntry: public ClassPathEntry {
1.121 + private:
1.122 + char* _path; // dir or file
1.123 + struct stat _st;
1.124 + MetaIndex* _meta_index;
1.125 + volatile ClassPathEntry* _resolved_entry;
1.126 + ClassPathEntry* resolve_entry();
1.127 + public:
1.128 + bool is_jar_file();
1.129 + const char* name() { return _path; }
1.130 + LazyClassPathEntry(char* path, struct stat st);
1.131 + ClassFileStream* open_stream(const char* name);
1.132 + void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
1.133 + virtual bool is_lazy();
1.134 + // Debugging
1.135 + NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
1.136 + NOT_PRODUCT(bool is_rt_jar();)
1.137 +};
1.138 +
1.139 +class PackageHashtable;
1.140 +class PackageInfo;
1.141 +class HashtableBucket;
1.142 +
1.143 +class ClassLoader: AllStatic {
1.144 + public:
1.145 + enum SomeConstants {
1.146 + package_hash_table_size = 31 // Number of buckets
1.147 + };
1.148 + private:
1.149 + friend class LazyClassPathEntry;
1.150 +
1.151 + // Performance counters
1.152 + static PerfCounter* _perf_accumulated_time;
1.153 + static PerfCounter* _perf_classes_inited;
1.154 + static PerfCounter* _perf_class_init_time;
1.155 + static PerfCounter* _perf_class_verify_time;
1.156 + static PerfCounter* _perf_classes_linked;
1.157 + static PerfCounter* _perf_class_link_time;
1.158 +
1.159 + static PerfCounter* _sync_systemLoaderLockContentionRate;
1.160 + static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
1.161 + static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
1.162 + static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
1.163 + static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
1.164 +
1.165 + static PerfCounter* _unsafe_defineClassCallCounter;
1.166 + static PerfCounter* _isUnsyncloadClass;
1.167 + static PerfCounter* _load_instance_class_failCounter;
1.168 +
1.169 + // First entry in linked list of ClassPathEntry instances
1.170 + static ClassPathEntry* _first_entry;
1.171 + // Last entry in linked list of ClassPathEntry instances
1.172 + static ClassPathEntry* _last_entry;
1.173 + // Hash table used to keep track of loaded packages
1.174 + static PackageHashtable* _package_hash_table;
1.175 + static const char* _shared_archive;
1.176 +
1.177 + // Hash function
1.178 + static unsigned int hash(const char *s, int n);
1.179 + // Returns the package file name corresponding to the specified package
1.180 + // or class name, or null if not found.
1.181 + static PackageInfo* lookup_package(const char *pkgname);
1.182 + // Adds a new package entry for the specified class or package name and
1.183 + // corresponding directory or jar file name.
1.184 + static bool add_package(const char *pkgname, int classpath_index, TRAPS);
1.185 +
1.186 + // Initialization
1.187 + static void setup_meta_index();
1.188 + static void setup_bootstrap_search_path();
1.189 + static void load_zip_library();
1.190 + static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
1.191 +
1.192 + // Canonicalizes path names, so strcmp will work properly. This is mainly
1.193 + // to avoid confusing the zip library
1.194 + static bool get_canonical_path(char* orig, char* out, int len);
1.195 + public:
1.196 + // Used by the kernel jvm.
1.197 + static void update_class_path_entry_list(const char *path,
1.198 + bool check_for_duplicates);
1.199 + static void print_bootclasspath();
1.200 +
1.201 + // Timing
1.202 + static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
1.203 + static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
1.204 + static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
1.205 + static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
1.206 + static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
1.207 + static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
1.208 +
1.209 + // Record how often system loader lock object is contended
1.210 + static PerfCounter* sync_systemLoaderLockContentionRate() {
1.211 + return _sync_systemLoaderLockContentionRate;
1.212 + }
1.213 +
1.214 + // Record how often non system loader lock object is contended
1.215 + static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
1.216 + return _sync_nonSystemLoaderLockContentionRate;
1.217 + }
1.218 +
1.219 + // Record how many calls to JVM_FindLoadedClass w/o holding a lock
1.220 + static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
1.221 + return _sync_JVMFindLoadedClassLockFreeCounter;
1.222 + }
1.223 +
1.224 + // Record how many calls to JVM_DefineClass w/o holding a lock
1.225 + static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
1.226 + return _sync_JVMDefineClassLockFreeCounter;
1.227 + }
1.228 +
1.229 + // Record how many calls to jni_DefineClass w/o holding a lock
1.230 + static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
1.231 + return _sync_JNIDefineClassLockFreeCounter;
1.232 + }
1.233 +
1.234 + // Record how many calls to Unsafe_DefineClass
1.235 + static PerfCounter* unsafe_defineClassCallCounter() {
1.236 + return _unsafe_defineClassCallCounter;
1.237 + }
1.238 +
1.239 + // Record how many times SystemDictionary::load_instance_class call
1.240 + // fails with linkageError when Unsyncloadclass flag is set.
1.241 + static PerfCounter* load_instance_class_failCounter() {
1.242 + return _load_instance_class_failCounter;
1.243 + }
1.244 +
1.245 + // Load individual .class file
1.246 + static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
1.247 +
1.248 + // If the specified package has been loaded by the system, then returns
1.249 + // the name of the directory or ZIP file that the package was loaded from.
1.250 + // Returns null if the package was not loaded.
1.251 + // Note: The specified name can either be the name of a class or package.
1.252 + // If a package name is specified, then it must be "/"-separator and also
1.253 + // end with a trailing "/".
1.254 + static oop get_system_package(const char* name, TRAPS);
1.255 +
1.256 + // Returns an array of Java strings representing all of the currently
1.257 + // loaded system packages.
1.258 + // Note: The package names returned are "/"-separated and end with a
1.259 + // trailing "/".
1.260 + static objArrayOop get_system_packages(TRAPS);
1.261 +
1.262 + // Initialization
1.263 + static void initialize();
1.264 + static void create_package_info_table();
1.265 + static void create_package_info_table(HashtableBucket *t, int length,
1.266 + int number_of_entries);
1.267 + static int compute_Object_vtable();
1.268 +
1.269 + static ClassPathEntry* classpath_entry(int n) {
1.270 + ClassPathEntry* e = ClassLoader::_first_entry;
1.271 + while (--n >= 0) {
1.272 + assert(e != NULL, "Not that many classpath entries.");
1.273 + e = e->next();
1.274 + }
1.275 + return e;
1.276 + }
1.277 +
1.278 + // Sharing dump and restore
1.279 + static void copy_package_info_buckets(char** top, char* end);
1.280 + static void copy_package_info_table(char** top, char* end);
1.281 +
1.282 + // VM monitoring and management support
1.283 + static jlong classloader_time_ms();
1.284 + static jlong class_method_total_size();
1.285 + static jlong class_init_count();
1.286 + static jlong class_init_time_ms();
1.287 + static jlong class_verify_time_ms();
1.288 + static jlong class_link_count();
1.289 + static jlong class_link_time_ms();
1.290 +
1.291 + // indicates if class path already contains a entry (exact match by name)
1.292 + static bool contains_entry(ClassPathEntry* entry);
1.293 +
1.294 + // adds a class path list
1.295 + static void add_to_list(ClassPathEntry* new_entry);
1.296 +
1.297 + // creates a class path zip entry (returns NULL if JAR file cannot be opened)
1.298 + static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
1.299 +
1.300 + // Debugging
1.301 + static void verify() PRODUCT_RETURN;
1.302 +
1.303 + // Force compilation of all methods in all classes in bootstrap class path (stress test)
1.304 +#ifndef PRODUCT
1.305 + private:
1.306 + static int _compile_the_world_counter;
1.307 + public:
1.308 + static void compile_the_world();
1.309 + static void compile_the_world_in(char* name, Handle loader, TRAPS);
1.310 + static int compile_the_world_counter() { return _compile_the_world_counter; }
1.311 +#endif //PRODUCT
1.312 +};
