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rev 6864 : 8061651: Interface to the Lookup Index Cache to improve URLClassPath search time
Summary: Implemented the interface in sun.misc.URLClassPath and corresponding JVM_XXX APIs
Reviewed-by: mchung, acorn, jiangli, dholmes
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--- old/src/share/vm/classfile/classLoader.hpp
+++ new/src/share/vm/classfile/classLoader.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
26 26 #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
27 27
28 28 #include "classfile/classFileParser.hpp"
29 29 #include "runtime/perfData.hpp"
30 30
31 31 // The VM class loader.
32 32 #include <sys/stat.h>
33 33
34 34
35 35 // Meta-index (optional, to be able to skip opening boot classpath jar files)
36 36 class MetaIndex: public CHeapObj<mtClass> {
37 37 private:
38 38 char** _meta_package_names;
39 39 int _num_meta_package_names;
40 40 public:
41 41 MetaIndex(char** meta_package_names, int num_meta_package_names);
42 42 ~MetaIndex();
43 43 bool may_contain(const char* class_name);
44 44 };
45 45
46 46
47 47 // Class path entry (directory or zip file)
48 48
49 49 class ClassPathEntry: public CHeapObj<mtClass> {
50 50 private:
51 51 ClassPathEntry* _next;
52 52 public:
53 53 // Next entry in class path
54 54 ClassPathEntry* next() { return _next; }
55 55 void set_next(ClassPathEntry* next) {
56 56 // may have unlocked readers, so write atomically.
57 57 OrderAccess::release_store_ptr(&_next, next);
58 58 }
59 59 virtual bool is_jar_file() = 0;
60 60 virtual const char* name() = 0;
61 61 virtual bool is_lazy();
62 62 // Constructor
63 63 ClassPathEntry();
64 64 // Attempt to locate file_name through this class path entry.
65 65 // Returns a class file parsing stream if successfull.
66 66 virtual ClassFileStream* open_stream(const char* name, TRAPS) = 0;
67 67 // Debugging
68 68 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
69 69 NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
70 70 };
71 71
72 72
73 73 class ClassPathDirEntry: public ClassPathEntry {
74 74 private:
75 75 const char* _dir; // Name of directory
76 76 public:
77 77 bool is_jar_file() { return false; }
78 78 const char* name() { return _dir; }
79 79 ClassPathDirEntry(const char* dir);
80 80 ClassFileStream* open_stream(const char* name, TRAPS);
81 81 // Debugging
82 82 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
83 83 NOT_PRODUCT(bool is_rt_jar();)
84 84 };
85 85
86 86
87 87 // Type definitions for zip file and zip file entry
88 88 typedef void* jzfile;
89 89 typedef struct {
90 90 char *name; /* entry name */
91 91 jlong time; /* modification time */
92 92 jlong size; /* size of uncompressed data */
93 93 jlong csize; /* size of compressed data (zero if uncompressed) */
94 94 jint crc; /* crc of uncompressed data */
95 95 char *comment; /* optional zip file comment */
96 96 jbyte *extra; /* optional extra data */
97 97 jlong pos; /* position of LOC header (if negative) or data */
98 98 } jzentry;
99 99
100 100
101 101 class ClassPathZipEntry: public ClassPathEntry {
102 102 private:
103 103 jzfile* _zip; // The zip archive
104 104 const char* _zip_name; // Name of zip archive
105 105 public:
106 106 bool is_jar_file() { return true; }
107 107 const char* name() { return _zip_name; }
108 108 ClassPathZipEntry(jzfile* zip, const char* zip_name);
109 109 ~ClassPathZipEntry();
110 110 u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
111 111 ClassFileStream* open_stream(const char* name, TRAPS);
112 112 void contents_do(void f(const char* name, void* context), void* context);
113 113 // Debugging
114 114 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
115 115 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
116 116 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
117 117 NOT_PRODUCT(bool is_rt_jar();)
118 118 NOT_PRODUCT(bool is_rt_jar12();)
119 119 NOT_PRODUCT(bool is_rt_jar13();)
120 120 };
121 121
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122 122
123 123 // For lazier loading of boot class path entries
124 124 class LazyClassPathEntry: public ClassPathEntry {
125 125 private:
126 126 const char* _path; // dir or file
127 127 struct stat _st;
128 128 MetaIndex* _meta_index;
129 129 bool _has_error;
130 130 bool _throw_exception;
131 131 volatile ClassPathEntry* _resolved_entry;
132 - ClassPathEntry* resolve_entry(TRAPS);
133 132 public:
133 + ClassPathEntry* resolve_entry(TRAPS);
134 134 bool is_jar_file();
135 135 const char* name() { return _path; }
136 136 LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception);
137 137 u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
138 138 ClassFileStream* open_stream(const char* name, TRAPS);
139 139 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
140 140 virtual bool is_lazy();
141 141 // Debugging
142 142 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
143 143 NOT_PRODUCT(bool is_rt_jar();)
144 144 };
145 145
146 146 class PackageHashtable;
147 147 class PackageInfo;
148 148 class SharedPathsMiscInfo;
149 149 template <MEMFLAGS F> class HashtableBucket;
150 150
151 151 class ClassLoader: AllStatic {
152 152 public:
153 153 enum SomeConstants {
154 154 package_hash_table_size = 31 // Number of buckets
155 155 };
156 156 protected:
157 157 friend class LazyClassPathEntry;
158 158
159 159 // Performance counters
160 160 static PerfCounter* _perf_accumulated_time;
161 161 static PerfCounter* _perf_classes_inited;
162 162 static PerfCounter* _perf_class_init_time;
163 163 static PerfCounter* _perf_class_init_selftime;
164 164 static PerfCounter* _perf_classes_verified;
165 165 static PerfCounter* _perf_class_verify_time;
166 166 static PerfCounter* _perf_class_verify_selftime;
167 167 static PerfCounter* _perf_classes_linked;
168 168 static PerfCounter* _perf_class_link_time;
169 169 static PerfCounter* _perf_class_link_selftime;
170 170 static PerfCounter* _perf_class_parse_time;
171 171 static PerfCounter* _perf_class_parse_selftime;
172 172 static PerfCounter* _perf_sys_class_lookup_time;
173 173 static PerfCounter* _perf_shared_classload_time;
174 174 static PerfCounter* _perf_sys_classload_time;
175 175 static PerfCounter* _perf_app_classload_time;
176 176 static PerfCounter* _perf_app_classload_selftime;
177 177 static PerfCounter* _perf_app_classload_count;
178 178 static PerfCounter* _perf_define_appclasses;
179 179 static PerfCounter* _perf_define_appclass_time;
180 180 static PerfCounter* _perf_define_appclass_selftime;
181 181 static PerfCounter* _perf_app_classfile_bytes_read;
182 182 static PerfCounter* _perf_sys_classfile_bytes_read;
183 183
184 184 static PerfCounter* _sync_systemLoaderLockContentionRate;
185 185 static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
186 186 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
187 187 static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
188 188 static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
189 189
190 190 static PerfCounter* _unsafe_defineClassCallCounter;
191 191 static PerfCounter* _isUnsyncloadClass;
192 192 static PerfCounter* _load_instance_class_failCounter;
193 193
194 194 // First entry in linked list of ClassPathEntry instances
195 195 static ClassPathEntry* _first_entry;
196 196 // Last entry in linked list of ClassPathEntry instances
197 197 static ClassPathEntry* _last_entry;
198 198 static int _num_entries;
199 199
200 200 // Hash table used to keep track of loaded packages
201 201 static PackageHashtable* _package_hash_table;
202 202 static const char* _shared_archive;
203 203
204 204 // Info used by CDS
205 205 CDS_ONLY(static SharedPathsMiscInfo * _shared_paths_misc_info;)
206 206
207 207 // Hash function
208 208 static unsigned int hash(const char *s, int n);
209 209 // Returns the package file name corresponding to the specified package
210 210 // or class name, or null if not found.
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211 211 static PackageInfo* lookup_package(const char *pkgname);
212 212 // Adds a new package entry for the specified class or package name and
213 213 // corresponding directory or jar file name.
214 214 static bool add_package(const char *pkgname, int classpath_index, TRAPS);
215 215
216 216 // Initialization
217 217 static void setup_bootstrap_meta_index();
218 218 static void setup_meta_index(const char* meta_index_path, const char* meta_index_dir,
219 219 int start_index);
220 220 static void setup_bootstrap_search_path();
221 - static void setup_search_path(const char *class_path);
221 + static void setup_search_path(const char *class_path, bool canonicalize=false);
222 222
223 223 static void load_zip_library();
224 224 static ClassPathEntry* create_class_path_entry(const char *path, const struct stat* st,
225 225 bool lazy, bool throw_exception, TRAPS);
226 226
227 227 // Canonicalizes path names, so strcmp will work properly. This is mainly
228 228 // to avoid confusing the zip library
229 229 static bool get_canonical_path(const char* orig, char* out, int len);
230 230 public:
231 231 static int crc32(int crc, const char* buf, int len);
232 232 static bool update_class_path_entry_list(const char *path,
233 233 bool check_for_duplicates,
234 234 bool throw_exception=true);
235 235 static void print_bootclasspath();
236 236
237 237 // Timing
238 238 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
239 239 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
240 240 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
241 241 static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; }
242 242 static PerfCounter* perf_classes_verified() { return _perf_classes_verified; }
243 243 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
244 244 static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; }
245 245 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
246 246 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
247 247 static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; }
248 248 static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; }
249 249 static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; }
250 250 static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; }
251 251 static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; }
252 252 static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; }
253 253 static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; }
254 254 static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; }
255 255 static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; }
256 256 static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; }
257 257 static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; }
258 258 static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
259 259 static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
260 260 static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
261 261
262 262 // Record how often system loader lock object is contended
263 263 static PerfCounter* sync_systemLoaderLockContentionRate() {
264 264 return _sync_systemLoaderLockContentionRate;
265 265 }
266 266
267 267 // Record how often non system loader lock object is contended
268 268 static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
269 269 return _sync_nonSystemLoaderLockContentionRate;
270 270 }
271 271
272 272 // Record how many calls to JVM_FindLoadedClass w/o holding a lock
273 273 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
274 274 return _sync_JVMFindLoadedClassLockFreeCounter;
275 275 }
276 276
277 277 // Record how many calls to JVM_DefineClass w/o holding a lock
278 278 static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
279 279 return _sync_JVMDefineClassLockFreeCounter;
280 280 }
281 281
282 282 // Record how many calls to jni_DefineClass w/o holding a lock
283 283 static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
284 284 return _sync_JNIDefineClassLockFreeCounter;
285 285 }
286 286
287 287 // Record how many calls to Unsafe_DefineClass
288 288 static PerfCounter* unsafe_defineClassCallCounter() {
289 289 return _unsafe_defineClassCallCounter;
290 290 }
291 291
292 292 // Record how many times SystemDictionary::load_instance_class call
293 293 // fails with linkageError when Unsyncloadclass flag is set.
294 294 static PerfCounter* load_instance_class_failCounter() {
295 295 return _load_instance_class_failCounter;
296 296 }
297 297
298 298 // Load individual .class file
299 299 static instanceKlassHandle load_classfile(Symbol* h_name, TRAPS);
300 300
301 301 // If the specified package has been loaded by the system, then returns
302 302 // the name of the directory or ZIP file that the package was loaded from.
303 303 // Returns null if the package was not loaded.
304 304 // Note: The specified name can either be the name of a class or package.
305 305 // If a package name is specified, then it must be "/"-separator and also
306 306 // end with a trailing "/".
307 307 static oop get_system_package(const char* name, TRAPS);
308 308
309 309 // Returns an array of Java strings representing all of the currently
310 310 // loaded system packages.
311 311 // Note: The package names returned are "/"-separated and end with a
312 312 // trailing "/".
313 313 static objArrayOop get_system_packages(TRAPS);
314 314
315 315 // Initialization
316 316 static void initialize();
317 317 CDS_ONLY(static void initialize_shared_path();)
318 318 static void create_package_info_table();
319 319 static void create_package_info_table(HashtableBucket<mtClass> *t, int length,
320 320 int number_of_entries);
321 321 static int compute_Object_vtable();
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322 322
323 323 static ClassPathEntry* classpath_entry(int n) {
324 324 ClassPathEntry* e = ClassLoader::_first_entry;
325 325 while (--n >= 0) {
326 326 assert(e != NULL, "Not that many classpath entries.");
327 327 e = e->next();
328 328 }
329 329 return e;
330 330 }
331 331
332 + static int num_classpath_entries() {
333 + return _num_entries;
334 + }
335 +
332 336 #if INCLUDE_CDS
333 337 // Sharing dump and restore
334 338 static void copy_package_info_buckets(char** top, char* end);
335 339 static void copy_package_info_table(char** top, char* end);
336 340
337 341 static void check_shared_classpath(const char *path);
338 342 static void finalize_shared_paths_misc_info();
339 343 static int get_shared_paths_misc_info_size();
340 344 static void* get_shared_paths_misc_info();
341 345 static bool check_shared_paths_misc_info(void* info, int size);
342 346 static void exit_with_path_failure(const char* error, const char* message);
343 347 #endif
344 348
345 349 static void trace_class_path(const char* msg, const char* name = NULL);
346 350
347 351 // VM monitoring and management support
348 352 static jlong classloader_time_ms();
349 353 static jlong class_method_total_size();
350 354 static jlong class_init_count();
351 355 static jlong class_init_time_ms();
352 356 static jlong class_verify_time_ms();
353 357 static jlong class_link_count();
354 358 static jlong class_link_time_ms();
355 359
356 360 // indicates if class path already contains a entry (exact match by name)
357 361 static bool contains_entry(ClassPathEntry* entry);
358 362
359 363 // adds a class path list
360 364 static void add_to_list(ClassPathEntry* new_entry);
361 365
362 366 // creates a class path zip entry (returns NULL if JAR file cannot be opened)
363 367 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
364 368
365 369 // Debugging
366 370 static void verify() PRODUCT_RETURN;
367 371
368 372 // Force compilation of all methods in all classes in bootstrap class path (stress test)
369 373 #ifndef PRODUCT
370 374 protected:
371 375 static int _compile_the_world_class_counter;
372 376 static int _compile_the_world_method_counter;
373 377 public:
374 378 static void compile_the_world();
375 379 static void compile_the_world_in(char* name, Handle loader, TRAPS);
376 380 static int compile_the_world_counter() { return _compile_the_world_class_counter; }
377 381 #endif //PRODUCT
378 382 };
379 383
380 384 // PerfClassTraceTime is used to measure time for class loading related events.
381 385 // This class tracks cumulative time and exclusive time for specific event types.
382 386 // During the execution of one event, other event types (e.g. class loading and
383 387 // resolution) as well as recursive calls of the same event type could happen.
384 388 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
385 389 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
386 390 // instances have been created as multiple events are happening.
387 391 class PerfClassTraceTime {
388 392 public:
389 393 enum {
390 394 CLASS_LOAD = 0,
391 395 PARSE_CLASS = 1,
392 396 CLASS_LINK = 2,
393 397 CLASS_VERIFY = 3,
394 398 CLASS_CLINIT = 4,
395 399 DEFINE_CLASS = 5,
396 400 EVENT_TYPE_COUNT = 6
397 401 };
398 402 protected:
399 403 // _t tracks time from initialization to destruction of this timer instance
400 404 // including time for all other event types, and recursive calls of this type.
401 405 // When a timer is called recursively, the elapsedTimer _t would not be used.
402 406 elapsedTimer _t;
403 407 PerfLongCounter* _timep;
404 408 PerfLongCounter* _selftimep;
405 409 PerfLongCounter* _eventp;
406 410 // pointer to thread-local recursion counter and timer array
407 411 // The thread_local timers track cumulative time for specific event types
408 412 // exclusive of time for other event types, but including recursive calls
409 413 // of the same type.
410 414 int* _recursion_counters;
411 415 elapsedTimer* _timers;
412 416 int _event_type;
413 417 int _prev_active_event;
414 418
415 419 public:
416 420
417 421 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
418 422 PerfLongCounter* selftimep, /* counter incremented with exclusive time */
419 423 PerfLongCounter* eventp, /* event counter */
420 424 int* recursion_counters, /* thread-local recursion counter array */
421 425 elapsedTimer* timers, /* thread-local timer array */
422 426 int type /* event type */ ) :
423 427 _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
424 428 initialize();
425 429 }
426 430
427 431 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
428 432 elapsedTimer* timers, /* thread-local timer array */
429 433 int type /* event type */ ) :
430 434 _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
431 435 initialize();
432 436 }
433 437
434 438 inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
435 439 inline void resume() { _t.start(); _timers[_event_type].start(); }
436 440
437 441 ~PerfClassTraceTime();
438 442 void initialize();
439 443 };
440 444
441 445 #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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