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comparison src/share/vm/classfile/classLoader.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 6a93908f268f
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // The VM class loader.
26 #include <sys/stat.h>
27
28
29 // Meta-index (optional, to be able to skip opening boot classpath jar files)
30 class MetaIndex: public CHeapObj {
31 private:
32 char** _meta_package_names;
33 int _num_meta_package_names;
34 public:
35 MetaIndex(char** meta_package_names, int num_meta_package_names);
36 ~MetaIndex();
37 bool may_contain(const char* class_name);
38 };
39
40
41 // Class path entry (directory or zip file)
42
43 class ClassPathEntry: public CHeapObj {
44 private:
45 ClassPathEntry* _next;
46 public:
47 // Next entry in class path
48 ClassPathEntry* next() { return _next; }
49 void set_next(ClassPathEntry* next) {
50 // may have unlocked readers, so write atomically.
51 OrderAccess::release_store_ptr(&_next, next);
52 }
53 virtual bool is_jar_file() = 0;
54 virtual const char* name() = 0;
55 virtual bool is_lazy();
56 // Constructor
57 ClassPathEntry();
58 // Attempt to locate file_name through this class path entry.
59 // Returns a class file parsing stream if successfull.
60 virtual ClassFileStream* open_stream(const char* name) = 0;
61 // Debugging
62 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
63 NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
64 };
65
66
67 class ClassPathDirEntry: public ClassPathEntry {
68 private:
69 char* _dir; // Name of directory
70 public:
71 bool is_jar_file() { return false; }
72 const char* name() { return _dir; }
73 ClassPathDirEntry(char* dir);
74 ClassFileStream* open_stream(const char* name);
75 // Debugging
76 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
77 NOT_PRODUCT(bool is_rt_jar();)
78 };
79
80
81 // Type definitions for zip file and zip file entry
82 typedef void* jzfile;
83 typedef struct {
84 char *name; /* entry name */
85 jlong time; /* modification time */
86 jlong size; /* size of uncompressed data */
87 jlong csize; /* size of compressed data (zero if uncompressed) */
88 jint crc; /* crc of uncompressed data */
89 char *comment; /* optional zip file comment */
90 jbyte *extra; /* optional extra data */
91 jlong pos; /* position of LOC header (if negative) or data */
92 } jzentry;
93
94
95 class ClassPathZipEntry: public ClassPathEntry {
96 private:
97 jzfile* _zip; // The zip archive
98 char* _zip_name; // Name of zip archive
99 public:
100 bool is_jar_file() { return true; }
101 const char* name() { return _zip_name; }
102 ClassPathZipEntry(jzfile* zip, const char* zip_name);
103 ~ClassPathZipEntry();
104 ClassFileStream* open_stream(const char* name);
105 void contents_do(void f(const char* name, void* context), void* context);
106 // Debugging
107 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
108 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
109 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
110 NOT_PRODUCT(bool is_rt_jar();)
111 NOT_PRODUCT(bool is_rt_jar12();)
112 NOT_PRODUCT(bool is_rt_jar13();)
113 };
114
115
116 // For lazier loading of boot class path entries
117 class LazyClassPathEntry: public ClassPathEntry {
118 private:
119 char* _path; // dir or file
120 struct stat _st;
121 MetaIndex* _meta_index;
122 volatile ClassPathEntry* _resolved_entry;
123 ClassPathEntry* resolve_entry();
124 public:
125 bool is_jar_file();
126 const char* name() { return _path; }
127 LazyClassPathEntry(char* path, struct stat st);
128 ClassFileStream* open_stream(const char* name);
129 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
130 virtual bool is_lazy();
131 // Debugging
132 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
133 NOT_PRODUCT(bool is_rt_jar();)
134 };
135
136 class PackageHashtable;
137 class PackageInfo;
138 class HashtableBucket;
139
140 class ClassLoader: AllStatic {
141 public:
142 enum SomeConstants {
143 package_hash_table_size = 31 // Number of buckets
144 };
145 private:
146 friend class LazyClassPathEntry;
147
148 // Performance counters
149 static PerfCounter* _perf_accumulated_time;
150 static PerfCounter* _perf_classes_inited;
151 static PerfCounter* _perf_class_init_time;
152 static PerfCounter* _perf_class_verify_time;
153 static PerfCounter* _perf_classes_linked;
154 static PerfCounter* _perf_class_link_time;
155
156 static PerfCounter* _sync_systemLoaderLockContentionRate;
157 static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
158 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
159 static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
160 static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
161
162 static PerfCounter* _unsafe_defineClassCallCounter;
163 static PerfCounter* _isUnsyncloadClass;
164 static PerfCounter* _load_instance_class_failCounter;
165
166 // First entry in linked list of ClassPathEntry instances
167 static ClassPathEntry* _first_entry;
168 // Last entry in linked list of ClassPathEntry instances
169 static ClassPathEntry* _last_entry;
170 // Hash table used to keep track of loaded packages
171 static PackageHashtable* _package_hash_table;
172 static const char* _shared_archive;
173
174 // Hash function
175 static unsigned int hash(const char *s, int n);
176 // Returns the package file name corresponding to the specified package
177 // or class name, or null if not found.
178 static PackageInfo* lookup_package(const char *pkgname);
179 // Adds a new package entry for the specified class or package name and
180 // corresponding directory or jar file name.
181 static bool add_package(const char *pkgname, int classpath_index, TRAPS);
182
183 // Initialization
184 static void setup_meta_index();
185 static void setup_bootstrap_search_path();
186 static void load_zip_library();
187 static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
188
189 // Canonicalizes path names, so strcmp will work properly. This is mainly
190 // to avoid confusing the zip library
191 static bool get_canonical_path(char* orig, char* out, int len);
192 public:
193 // Used by the kernel jvm.
194 static void update_class_path_entry_list(const char *path,
195 bool check_for_duplicates);
196 static void print_bootclasspath();
197
198 // Timing
199 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
200 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
201 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
202 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
203 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
204 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
205
206 // Record how often system loader lock object is contended
207 static PerfCounter* sync_systemLoaderLockContentionRate() {
208 return _sync_systemLoaderLockContentionRate;
209 }
210
211 // Record how often non system loader lock object is contended
212 static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
213 return _sync_nonSystemLoaderLockContentionRate;
214 }
215
216 // Record how many calls to JVM_FindLoadedClass w/o holding a lock
217 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
218 return _sync_JVMFindLoadedClassLockFreeCounter;
219 }
220
221 // Record how many calls to JVM_DefineClass w/o holding a lock
222 static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
223 return _sync_JVMDefineClassLockFreeCounter;
224 }
225
226 // Record how many calls to jni_DefineClass w/o holding a lock
227 static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
228 return _sync_JNIDefineClassLockFreeCounter;
229 }
230
231 // Record how many calls to Unsafe_DefineClass
232 static PerfCounter* unsafe_defineClassCallCounter() {
233 return _unsafe_defineClassCallCounter;
234 }
235
236 // Record how many times SystemDictionary::load_instance_class call
237 // fails with linkageError when Unsyncloadclass flag is set.
238 static PerfCounter* load_instance_class_failCounter() {
239 return _load_instance_class_failCounter;
240 }
241
242 // Load individual .class file
243 static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
244
245 // If the specified package has been loaded by the system, then returns
246 // the name of the directory or ZIP file that the package was loaded from.
247 // Returns null if the package was not loaded.
248 // Note: The specified name can either be the name of a class or package.
249 // If a package name is specified, then it must be "/"-separator and also
250 // end with a trailing "/".
251 static oop get_system_package(const char* name, TRAPS);
252
253 // Returns an array of Java strings representing all of the currently
254 // loaded system packages.
255 // Note: The package names returned are "/"-separated and end with a
256 // trailing "/".
257 static objArrayOop get_system_packages(TRAPS);
258
259 // Initialization
260 static void initialize();
261 static void create_package_info_table();
262 static void create_package_info_table(HashtableBucket *t, int length,
263 int number_of_entries);
264 static int compute_Object_vtable();
265
266 static ClassPathEntry* classpath_entry(int n) {
267 ClassPathEntry* e = ClassLoader::_first_entry;
268 while (--n >= 0) {
269 assert(e != NULL, "Not that many classpath entries.");
270 e = e->next();
271 }
272 return e;
273 }
274
275 // Sharing dump and restore
276 static void copy_package_info_buckets(char** top, char* end);
277 static void copy_package_info_table(char** top, char* end);
278
279 // VM monitoring and management support
280 static jlong classloader_time_ms();
281 static jlong class_method_total_size();
282 static jlong class_init_count();
283 static jlong class_init_time_ms();
284 static jlong class_verify_time_ms();
285 static jlong class_link_count();
286 static jlong class_link_time_ms();
287
288 // indicates if class path already contains a entry (exact match by name)
289 static bool contains_entry(ClassPathEntry* entry);
290
291 // adds a class path list
292 static void add_to_list(ClassPathEntry* new_entry);
293
294 // creates a class path zip entry (returns NULL if JAR file cannot be opened)
295 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
296
297 // Debugging
298 static void verify() PRODUCT_RETURN;
299
300 // Force compilation of all methods in all classes in bootstrap class path (stress test)
301 #ifndef PRODUCT
302 private:
303 static int _compile_the_world_counter;
304 public:
305 static void compile_the_world();
306 static void compile_the_world_in(char* name, Handle loader, TRAPS);
307 static int compile_the_world_counter() { return _compile_the_world_counter; }
308 #endif //PRODUCT
309 };