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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/memory/metaspaceShared.cpp
+++ new/src/share/vm/memory/metaspaceShared.cpp
1 1 /*
2 2 * Copyright (c) 2012, 2014, 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,
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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 #include "precompiled.hpp"
26 26 #include "classfile/dictionary.hpp"
27 +#include "classfile/classLoaderExt.hpp"
27 28 #include "classfile/loaderConstraints.hpp"
28 29 #include "classfile/placeholders.hpp"
29 30 #include "classfile/sharedClassUtil.hpp"
30 31 #include "classfile/symbolTable.hpp"
31 32 #include "classfile/systemDictionary.hpp"
32 33 #include "code/codeCache.hpp"
33 34 #include "memory/filemap.hpp"
34 35 #include "memory/gcLocker.hpp"
35 36 #include "memory/metaspace.hpp"
36 37 #include "memory/metaspaceShared.hpp"
37 38 #include "oops/objArrayOop.hpp"
38 39 #include "oops/oop.inline.hpp"
39 40 #include "runtime/signature.hpp"
40 41 #include "runtime/vm_operations.hpp"
41 42 #include "runtime/vmThread.hpp"
43 +#include "utilities/hashtable.hpp"
42 44 #include "utilities/hashtable.inline.hpp"
43 45
44 46 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
45 47
46 48 int MetaspaceShared::_max_alignment = 0;
47 49
48 50 ReservedSpace* MetaspaceShared::_shared_rs = NULL;
49 51
50 52 bool MetaspaceShared::_link_classes_made_progress;
51 53 bool MetaspaceShared::_check_classes_made_progress;
52 54 bool MetaspaceShared::_has_error_classes;
53 55 bool MetaspaceShared::_archive_loading_failed = false;
54 56 // Read/write a data stream for restoring/preserving metadata pointers and
55 57 // miscellaneous data from/to the shared archive file.
56 58
57 59 void MetaspaceShared::serialize(SerializeClosure* soc) {
58 60 int tag = 0;
59 61 soc->do_tag(--tag);
60 62
61 63 // Verify the sizes of various metadata in the system.
62 64 soc->do_tag(sizeof(Method));
63 65 soc->do_tag(sizeof(ConstMethod));
64 66 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
65 67 soc->do_tag(sizeof(ConstantPool));
66 68 soc->do_tag(sizeof(ConstantPoolCache));
67 69 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
68 70 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
69 71 soc->do_tag(sizeof(Symbol));
70 72
71 73 // Dump/restore miscellaneous metadata.
72 74 Universe::serialize(soc, true);
73 75 soc->do_tag(--tag);
74 76
75 77 // Dump/restore references to commonly used names and signatures.
76 78 vmSymbols::serialize(soc);
77 79 soc->do_tag(--tag);
78 80
79 81 soc->do_tag(666);
80 82 }
81 83
82 84
83 85 // CDS code for dumping shared archive.
84 86
85 87 // Global object for holding classes that have been loaded. Since this
86 88 // is run at a safepoint just before exit, this is the entire set of classes.
87 89 static GrowableArray<Klass*>* _global_klass_objects;
88 90 static void collect_classes(Klass* k) {
89 91 _global_klass_objects->append_if_missing(k);
90 92 if (k->oop_is_instance()) {
91 93 // Add in the array classes too
92 94 InstanceKlass* ik = InstanceKlass::cast(k);
93 95 ik->array_klasses_do(collect_classes);
94 96 }
95 97 }
96 98
97 99 static void remove_unshareable_in_classes() {
98 100 for (int i = 0; i < _global_klass_objects->length(); i++) {
99 101 Klass* k = _global_klass_objects->at(i);
100 102 k->remove_unshareable_info();
101 103 }
102 104 }
103 105
104 106 // Walk all methods in the class list and assign a fingerprint.
105 107 // so that this part of the ConstMethod* is read only.
106 108 static void calculate_fingerprints() {
107 109 for (int i = 0; i < _global_klass_objects->length(); i++) {
108 110 Klass* k = _global_klass_objects->at(i);
109 111 if (k->oop_is_instance()) {
110 112 InstanceKlass* ik = InstanceKlass::cast(k);
111 113 for (int i = 0; i < ik->methods()->length(); i++) {
112 114 Method* m = ik->methods()->at(i);
113 115 Fingerprinter fp(m);
114 116 // The side effect of this call sets method's fingerprint field.
115 117 fp.fingerprint();
116 118 }
117 119 }
118 120 }
119 121 }
120 122
121 123 // Patch C++ vtable pointer in metadata.
122 124
123 125 // Klass and other metadata objects contain references to c++ vtables in the
124 126 // JVM library.
125 127 // Fix them to point to our constructed vtables. However, don't iterate
126 128 // across the space while doing this, as that causes the vtables to be
127 129 // patched, undoing our useful work. Instead, iterate to make a list,
128 130 // then use the list to do the fixing.
129 131 //
130 132 // Our constructed vtables:
131 133 // Dump time:
132 134 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs
133 135 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list
134 136 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and
135 137 // associated metadata to point to jump table rather than to current vtbl
136 138 // Table layout: NOTE FIXED SIZE
137 139 // 1. vtbl pointers
138 140 // 2. #Klass X #virtual methods per Klass
139 141 // 1 entry for each, in the order:
140 142 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry
141 143 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry
142 144 // ...
143 145 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry,
144 146 // ... Klass<vtbl_list_size>:method<num_virtuals> entry
145 147 // Sample entry: (Sparc):
146 148 // save(sp, -256, sp)
147 149 // ba,pt common_code
148 150 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255)
149 151 //
150 152 // Restore time:
151 153 // 1. initialize_shared_space: reserve space for table
152 154 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text
153 155 //
154 156 // Execution time:
155 157 // First virtual method call for any object of these metadata types:
156 158 // 1. object->klass
157 159 // 2. vtable entry for that klass points to the jump table entries
158 160 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index
159 161 // 4. common_code:
160 162 // Get address of new vtbl pointer for this Klass from updated table
161 163 // Update new vtbl pointer in the Klass: future virtual calls go direct
162 164 // Jump to method, using new vtbl pointer and method index
163 165
164 166
165 167 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) {
166 168 void* old_vtbl_ptr = *(void**)obj;
167 169 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) {
168 170 if (vtbl_list[i] == old_vtbl_ptr) {
169 171 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals;
170 172 }
171 173 }
172 174 ShouldNotReachHere();
173 175 return NULL;
174 176 }
175 177
176 178 // Assumes the vtable is in first slot in object.
177 179 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) {
178 180 int n = _global_klass_objects->length();
179 181 for (int i = 0; i < n; i++) {
180 182 Klass* obj = _global_klass_objects->at(i);
181 183 // Note oop_is_instance() is a virtual call. After patching vtables
182 184 // all virtual calls on the dummy vtables will restore the original!
183 185 if (obj->oop_is_instance()) {
184 186 InstanceKlass* ik = InstanceKlass::cast(obj);
185 187 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik);
186 188 ConstantPool* cp = ik->constants();
187 189 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp);
188 190 for (int j = 0; j < ik->methods()->length(); j++) {
189 191 Method* m = ik->methods()->at(j);
190 192 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m);
191 193 }
192 194 } else {
193 195 // Array klasses
194 196 Klass* k = obj;
195 197 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k);
196 198 }
197 199 }
198 200 }
199 201
200 202 // Closure for serializing initialization data out to a data area to be
201 203 // written to the shared file.
202 204
203 205 class WriteClosure : public SerializeClosure {
204 206 private:
205 207 intptr_t* top;
206 208 char* end;
207 209
208 210 inline void check_space() {
209 211 if ((char*)top + sizeof(intptr_t) > end) {
210 212 report_out_of_shared_space(SharedMiscData);
211 213 }
212 214 }
213 215
214 216 public:
215 217 WriteClosure(char* md_top, char* md_end) {
216 218 top = (intptr_t*)md_top;
217 219 end = md_end;
218 220 }
219 221
220 222 char* get_top() { return (char*)top; }
221 223
222 224 void do_ptr(void** p) {
223 225 check_space();
224 226 *top = (intptr_t)*p;
225 227 ++top;
226 228 }
227 229
228 230 void do_tag(int tag) {
229 231 check_space();
230 232 *top = (intptr_t)tag;
231 233 ++top;
232 234 }
233 235
234 236 void do_region(u_char* start, size_t size) {
235 237 if ((char*)top + size > end) {
236 238 report_out_of_shared_space(SharedMiscData);
237 239 }
238 240 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
239 241 assert(size % sizeof(intptr_t) == 0, "bad size");
240 242 do_tag((int)size);
241 243 while (size > 0) {
242 244 *top = *(intptr_t*)start;
243 245 ++top;
244 246 start += sizeof(intptr_t);
245 247 size -= sizeof(intptr_t);
246 248 }
247 249 }
248 250
249 251 bool reading() const { return false; }
250 252 };
251 253
252 254 // This is for dumping detailed statistics for the allocations
253 255 // in the shared spaces.
254 256 class DumpAllocClosure : public Metaspace::AllocRecordClosure {
255 257 public:
256 258
257 259 // Here's poor man's enum inheritance
258 260 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
259 261 METASPACE_OBJ_TYPES_DO(f) \
260 262 f(SymbolHashentry) \
261 263 f(SymbolBuckets) \
262 264 f(Other)
263 265
264 266 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type,
265 267 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
266 268
267 269 enum Type {
268 270 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
269 271 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE)
270 272 _number_of_types
271 273 };
272 274
273 275 static const char * type_name(Type type) {
274 276 switch(type) {
275 277 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE)
276 278 default:
277 279 ShouldNotReachHere();
278 280 return NULL;
279 281 }
280 282 }
281 283
282 284 public:
283 285 enum {
284 286 RO = 0,
285 287 RW = 1
286 288 };
287 289
288 290 int _counts[2][_number_of_types];
289 291 int _bytes [2][_number_of_types];
290 292 int _which;
291 293
292 294 DumpAllocClosure() {
293 295 memset(_counts, 0, sizeof(_counts));
294 296 memset(_bytes, 0, sizeof(_bytes));
295 297 };
296 298
297 299 void iterate_metaspace(Metaspace* space, int which) {
298 300 assert(which == RO || which == RW, "sanity");
299 301 _which = which;
300 302 space->iterate(this);
301 303 }
302 304
303 305 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) {
304 306 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
305 307 _counts[_which][type] ++;
306 308 _bytes [_which][type] += byte_size;
307 309 }
308 310
309 311 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all);
310 312 };
311 313
312 314 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) {
313 315 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write
314 316 int other_bytes = md_all + mc_all;
315 317
316 318 // Calculate size of data that was not allocated by Metaspace::allocate()
317 319 int symbol_count = _counts[RO][MetaspaceObj::SymbolType];
318 320 int symhash_bytes = symbol_count * sizeof (HashtableEntry<Symbol*, mtSymbol>);
319 321 int symbuck_count = SymbolTable::the_table()->table_size();
320 322 int symbuck_bytes = symbuck_count * sizeof(HashtableBucket<mtSymbol>);
321 323
322 324 _counts[RW][SymbolHashentryType] = symbol_count;
323 325 _bytes [RW][SymbolHashentryType] = symhash_bytes;
324 326 other_bytes -= symhash_bytes;
325 327
326 328 _counts[RW][SymbolBucketsType] = symbuck_count;
327 329 _bytes [RW][SymbolBucketsType] = symbuck_bytes;
328 330 other_bytes -= symbuck_bytes;
329 331
330 332 // TODO: count things like dictionary, vtable, etc
331 333 _bytes[RW][OtherType] = other_bytes;
332 334
333 335 // prevent divide-by-zero
334 336 if (ro_all < 1) {
335 337 ro_all = 1;
336 338 }
337 339 if (rw_all < 1) {
338 340 rw_all = 1;
339 341 }
340 342
341 343 int all_ro_count = 0;
342 344 int all_ro_bytes = 0;
343 345 int all_rw_count = 0;
344 346 int all_rw_bytes = 0;
345 347
346 348 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
347 349 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
348 350 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
349 351 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
350 352
351 353 tty->print_cr("Detailed metadata info (rw includes md and mc):");
352 354 tty->print_cr("%s", hdr);
353 355 tty->print_cr("%s", sep);
354 356 for (int type = 0; type < int(_number_of_types); type ++) {
355 357 const char *name = type_name((Type)type);
356 358 int ro_count = _counts[RO][type];
357 359 int ro_bytes = _bytes [RO][type];
358 360 int rw_count = _counts[RW][type];
359 361 int rw_bytes = _bytes [RW][type];
360 362 int count = ro_count + rw_count;
361 363 int bytes = ro_bytes + rw_bytes;
362 364
363 365 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
364 366 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
365 367 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
366 368
367 369 tty->print_cr(fmt_stats, name,
368 370 ro_count, ro_bytes, ro_perc,
369 371 rw_count, rw_bytes, rw_perc,
370 372 count, bytes, perc);
371 373
372 374 all_ro_count += ro_count;
373 375 all_ro_bytes += ro_bytes;
374 376 all_rw_count += rw_count;
375 377 all_rw_bytes += rw_bytes;
376 378 }
377 379
378 380 int all_count = all_ro_count + all_rw_count;
379 381 int all_bytes = all_ro_bytes + all_rw_bytes;
380 382
381 383 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
382 384 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
383 385 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
384 386
385 387 tty->print_cr("%s", sep);
386 388 tty->print_cr(fmt_stats, "Total",
387 389 all_ro_count, all_ro_bytes, all_ro_perc,
388 390 all_rw_count, all_rw_bytes, all_rw_perc,
389 391 all_count, all_bytes, all_perc);
390 392
391 393 assert(all_ro_bytes == ro_all, "everything should have been counted");
392 394 assert(all_rw_bytes == rw_all, "everything should have been counted");
393 395 #undef fmt_stats
394 396 }
395 397
396 398 // Populate the shared space.
397 399
398 400 class VM_PopulateDumpSharedSpace: public VM_Operation {
399 401 private:
400 402 ClassLoaderData* _loader_data;
401 403 GrowableArray<Klass*> *_class_promote_order;
402 404 VirtualSpace _md_vs;
403 405 VirtualSpace _mc_vs;
404 406
405 407 public:
406 408 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data,
407 409 GrowableArray<Klass*> *class_promote_order) :
408 410 _loader_data(loader_data) {
409 411
410 412 // Split up and initialize the misc code and data spaces
411 413 ReservedSpace* shared_rs = MetaspaceShared::shared_rs();
412 414 int metadata_size = SharedReadOnlySize+SharedReadWriteSize;
413 415 ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size);
414 416 ReservedSpace misc_section = shared_rs->last_part(metadata_size);
415 417
416 418 // Now split into misc sections.
417 419 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize);
418 420 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize);
419 421 _md_vs.initialize(md_rs, SharedMiscDataSize);
420 422 _mc_vs.initialize(mc_rs, SharedMiscCodeSize);
421 423 _class_promote_order = class_promote_order;
422 424 }
423 425
424 426 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
425 427 void doit(); // outline because gdb sucks
426 428 }; // class VM_PopulateDumpSharedSpace
427 429
428 430
429 431 void VM_PopulateDumpSharedSpace::doit() {
430 432 Thread* THREAD = VMThread::vm_thread();
431 433 NOT_PRODUCT(SystemDictionary::verify();)
432 434 // The following guarantee is meant to ensure that no loader constraints
433 435 // exist yet, since the constraints table is not shared. This becomes
434 436 // more important now that we don't re-initialize vtables/itables for
435 437 // shared classes at runtime, where constraints were previously created.
436 438 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
437 439 "loader constraints are not saved");
438 440 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
439 441 "placeholders are not saved");
440 442 // Revisit and implement this if we prelink method handle call sites:
441 443 guarantee(SystemDictionary::invoke_method_table() == NULL ||
442 444 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
443 445 "invoke method table is not saved");
444 446
445 447 // At this point, many classes have been loaded.
446 448 // Gather systemDictionary classes in a global array and do everything to
447 449 // that so we don't have to walk the SystemDictionary again.
448 450 _global_klass_objects = new GrowableArray<Klass*>(1000);
449 451 Universe::basic_type_classes_do(collect_classes);
450 452 SystemDictionary::classes_do(collect_classes);
451 453
452 454 tty->print_cr("Number of classes %d", _global_klass_objects->length());
453 455 {
454 456 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
455 457 for (int i = 0; i < _global_klass_objects->length(); i++) {
456 458 Klass* k = _global_klass_objects->at(i);
457 459 if (k->oop_is_instance()) {
458 460 num_inst ++;
459 461 } else if (k->oop_is_objArray()) {
460 462 num_obj_array ++;
461 463 } else {
462 464 assert(k->oop_is_typeArray(), "sanity");
463 465 num_type_array ++;
464 466 }
465 467 }
466 468 tty->print_cr(" instance classes = %5d", num_inst);
467 469 tty->print_cr(" obj array classes = %5d", num_obj_array);
468 470 tty->print_cr(" type array classes = %5d", num_type_array);
469 471 }
470 472
471 473 // Update all the fingerprints in the shared methods.
472 474 tty->print("Calculating fingerprints ... ");
473 475 calculate_fingerprints();
474 476 tty->print_cr("done. ");
475 477
476 478 // Remove all references outside the metadata
477 479 tty->print("Removing unshareable information ... ");
478 480 remove_unshareable_in_classes();
479 481 tty->print_cr("done. ");
480 482
481 483 // Set up the share data and shared code segments.
482 484 char* md_low = _md_vs.low();
483 485 char* md_top = md_low;
484 486 char* md_end = _md_vs.high();
485 487 char* mc_low = _mc_vs.low();
486 488 char* mc_top = mc_low;
487 489 char* mc_end = _mc_vs.high();
488 490
489 491 // Reserve space for the list of Klass*s whose vtables are used
490 492 // for patching others as needed.
491 493
492 494 void** vtbl_list = (void**)md_top;
493 495 int vtbl_list_size = MetaspaceShared::vtbl_list_size;
494 496 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
495 497
496 498 md_top += vtbl_list_size * sizeof(void*);
497 499 void* vtable = md_top;
498 500
499 501 // Reserve space for a new dummy vtable for klass objects in the
500 502 // heap. Generate self-patching vtable entries.
501 503
502 504 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable,
503 505 &md_top, md_end,
504 506 &mc_top, mc_end);
505 507
506 508 // Reorder the system dictionary. (Moving the symbols affects
507 509 // how the hash table indices are calculated.)
508 510 // Not doing this either.
509 511
510 512 SystemDictionary::reorder_dictionary();
511 513
512 514 NOT_PRODUCT(SystemDictionary::verify();)
513 515
514 516 // Copy the the symbol table, and the system dictionary to the shared
515 517 // space in usable form. Copy the hastable
516 518 // buckets first [read-write], then copy the linked lists of entries
517 519 // [read-only].
518 520
519 521 SymbolTable::reverse(md_top);
520 522 NOT_PRODUCT(SymbolTable::verify());
521 523 SymbolTable::copy_buckets(&md_top, md_end);
522 524
523 525 SystemDictionary::reverse();
524 526 SystemDictionary::copy_buckets(&md_top, md_end);
525 527
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526 528 ClassLoader::verify();
527 529 ClassLoader::copy_package_info_buckets(&md_top, md_end);
528 530 ClassLoader::verify();
529 531
530 532 SymbolTable::copy_table(&md_top, md_end);
531 533 SystemDictionary::copy_table(&md_top, md_end);
532 534 ClassLoader::verify();
533 535 ClassLoader::copy_package_info_table(&md_top, md_end);
534 536 ClassLoader::verify();
535 537
538 + ClassLoaderExt::copy_lookup_cache_to_archive(&md_top, md_end);
539 +
536 540 // Write the other data to the output array.
537 541 WriteClosure wc(md_top, md_end);
538 542 MetaspaceShared::serialize(&wc);
539 543 md_top = wc.get_top();
540 544
541 545 // Print shared spaces all the time
542 546 // To make fmt_space be a syntactic constant (for format warnings), use #define.
543 547 #define fmt_space "%s space: %9d [ %4.1f%% of total] out of %9d bytes [%4.1f%% used] at " PTR_FORMAT
544 548 Metaspace* ro_space = _loader_data->ro_metaspace();
545 549 Metaspace* rw_space = _loader_data->rw_metaspace();
546 550
547 551 // Allocated size of each space (may not be all occupied)
548 552 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType);
549 553 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType);
550 554 const size_t md_alloced = md_end-md_low;
551 555 const size_t mc_alloced = mc_end-mc_low;
552 556 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced;
553 557
554 558 // Occupied size of each space.
555 559 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType);
556 560 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType);
557 561 const size_t md_bytes = size_t(md_top - md_low);
558 562 const size_t mc_bytes = size_t(mc_top - mc_low);
559 563
560 564 // Percent of total size
561 565 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes;
562 566 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0;
563 567 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0;
564 568 const double md_t_perc = md_bytes / double(total_bytes) * 100.0;
565 569 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0;
566 570
567 571 // Percent of fullness of each space
568 572 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0;
569 573 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0;
570 574 const double md_u_perc = md_bytes / double(md_alloced) * 100.0;
571 575 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0;
572 576 const double total_u_perc = total_bytes / double(total_alloced) * 100.0;
573 577
574 578 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, ro_space->bottom());
575 579 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, rw_space->bottom());
576 580 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, md_low);
577 581 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, mc_low);
578 582 tty->print_cr("total : %9d [100.0%% of total] out of %9d bytes [%4.1f%% used]",
579 583 total_bytes, total_alloced, total_u_perc);
580 584
581 585 // Update the vtable pointers in all of the Klass objects in the
582 586 // heap. They should point to newly generated vtable.
583 587 patch_klass_vtables(vtbl_list, vtable);
584 588
585 589 // dunno what this is for.
586 590 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass);
587 591 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
588 592 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
589 593
590 594 // Create and write the archive file that maps the shared spaces.
591 595
592 596 FileMapInfo* mapinfo = new FileMapInfo();
593 597 mapinfo->populate_header(MetaspaceShared::max_alignment());
594 598
595 599 // Pass 1 - update file offsets in header.
596 600 mapinfo->write_header();
597 601 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
598 602 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
599 603 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
600 604 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
601 605 SharedMiscDataSize,
602 606 false, false);
603 607 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
604 608 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
605 609 SharedMiscCodeSize,
606 610 true, true);
607 611
608 612 // Pass 2 - write data.
609 613 mapinfo->open_for_write();
610 614 mapinfo->set_header_crc(mapinfo->compute_header_crc());
611 615 mapinfo->write_header();
612 616 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
613 617 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
614 618 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
615 619 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
616 620 SharedMiscDataSize,
617 621 false, false);
618 622 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
619 623 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
620 624 SharedMiscCodeSize,
621 625 true, true);
622 626 mapinfo->close();
623 627
624 628 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
625 629
626 630 if (PrintSharedSpaces) {
627 631 DumpAllocClosure dac;
628 632 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO);
629 633 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW);
630 634
631 635 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes));
632 636 }
633 637 #undef fmt_space
634 638 }
635 639
636 640
637 641 void MetaspaceShared::link_one_shared_class(Klass* obj, TRAPS) {
638 642 Klass* k = obj;
639 643 if (k->oop_is_instance()) {
640 644 InstanceKlass* ik = (InstanceKlass*) k;
641 645 // Link the class to cause the bytecodes to be rewritten and the
642 646 // cpcache to be created. Class verification is done according
643 647 // to -Xverify setting.
644 648 _link_classes_made_progress |= try_link_class(ik, THREAD);
645 649 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
646 650 }
647 651 }
648 652
649 653 void MetaspaceShared::check_one_shared_class(Klass* k) {
650 654 if (k->oop_is_instance() && InstanceKlass::cast(k)->check_sharing_error_state()) {
651 655 _check_classes_made_progress = true;
652 656 }
653 657 }
654 658
655 659 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
656 660 // We need to iterate because verification may cause additional classes
657 661 // to be loaded.
658 662 do {
659 663 _link_classes_made_progress = false;
660 664 SystemDictionary::classes_do(link_one_shared_class, THREAD);
661 665 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
662 666 } while (_link_classes_made_progress);
663 667
664 668 if (_has_error_classes) {
665 669 // Mark all classes whose super class or interfaces failed verification.
666 670 do {
667 671 // Not completely sure if we need to do this iteratively. Anyway,
668 672 // we should come here only if there are unverifiable classes, which
669 673 // shouldn't happen in normal cases. So better safe than sorry.
670 674 _check_classes_made_progress = false;
671 675 SystemDictionary::classes_do(check_one_shared_class);
672 676 } while (_check_classes_made_progress);
673 677
674 678 if (IgnoreUnverifiableClassesDuringDump) {
675 679 // This is useful when running JCK or SQE tests. You should not
676 680 // enable this when running real apps.
677 681 SystemDictionary::remove_classes_in_error_state();
678 682 } else {
679 683 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
680 684 exit(1);
681 685 }
682 686 }
683 687 }
684 688
685 689 void MetaspaceShared::prepare_for_dumping() {
686 690 ClassLoader::initialize_shared_path();
687 691 FileMapInfo::allocate_classpath_entry_table();
688 692 }
689 693
690 694 // Preload classes from a list, populate the shared spaces and dump to a
691 695 // file.
692 696 void MetaspaceShared::preload_and_dump(TRAPS) {
693 697 TraceTime timer("Dump Shared Spaces", TraceStartupTime);
694 698 ResourceMark rm;
695 699
696 700 tty->print_cr("Allocated shared space: %d bytes at " PTR_FORMAT,
697 701 MetaspaceShared::shared_rs()->size(),
698 702 MetaspaceShared::shared_rs()->base());
699 703
700 704 // Preload classes to be shared.
701 705 // Should use some os:: method rather than fopen() here. aB.
702 706 const char* class_list_path;
703 707 if (SharedClassListFile == NULL) {
704 708 // Construct the path to the class list (in jre/lib)
705 709 // Walk up two directories from the location of the VM and
706 710 // optionally tack on "lib" (depending on platform)
707 711 char class_list_path_str[JVM_MAXPATHLEN];
708 712 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
709 713 for (int i = 0; i < 3; i++) {
710 714 char *end = strrchr(class_list_path_str, *os::file_separator());
711 715 if (end != NULL) *end = '\0';
712 716 }
713 717 int class_list_path_len = (int)strlen(class_list_path_str);
714 718 if (class_list_path_len >= 3) {
715 719 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
716 720 strcat(class_list_path_str, os::file_separator());
717 721 strcat(class_list_path_str, "lib");
718 722 }
719 723 }
720 724 strcat(class_list_path_str, os::file_separator());
721 725 strcat(class_list_path_str, "classlist");
722 726 class_list_path = class_list_path_str;
723 727 } else {
724 728 class_list_path = SharedClassListFile;
725 729 }
726 730
727 731 int class_count = 0;
728 732 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
729 733
730 734 // sun.io.Converters
731 735 static const char obj_array_sig[] = "[[Ljava/lang/Object;";
732 736 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
733 737
734 738 // java.util.HashMap
735 739 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
736 740 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
737 741
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738 742 tty->print_cr("Loading classes to share ...");
739 743 _has_error_classes = false;
740 744 class_count += preload_and_dump(class_list_path, class_promote_order,
741 745 THREAD);
742 746 if (ExtraSharedClassListFile) {
743 747 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
744 748 THREAD);
745 749 }
746 750 tty->print_cr("Loading classes to share: done.");
747 751
752 + ClassLoaderExt::init_lookup_cache(THREAD);
753 +
748 754 if (PrintSharedSpaces) {
749 755 tty->print_cr("Shared spaces: preloaded %d classes", class_count);
750 756 }
751 757
752 758 // Rewrite and link classes
753 759 tty->print_cr("Rewriting and linking classes ...");
754 760
755 761 // Link any classes which got missed. This would happen if we have loaded classes that
756 762 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
757 763 // fails verification, all other interfaces that were not specified in the classlist but
758 764 // are implemented by K are not verified.
759 765 link_and_cleanup_shared_classes(CATCH);
760 766 tty->print_cr("Rewriting and linking classes: done");
761 767
762 768 // Create and dump the shared spaces. Everything so far is loaded
763 769 // with the null class loader.
764 770 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
765 771 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
766 772 VMThread::execute(&op);
767 773
768 774 // Since various initialization steps have been undone by this process,
769 775 // it is not reasonable to continue running a java process.
770 776 exit(0);
771 777 }
772 778
773 779 int MetaspaceShared::preload_and_dump(const char * class_list_path,
774 780 GrowableArray<Klass*>* class_promote_order,
775 781 TRAPS) {
776 782 FILE* file = fopen(class_list_path, "r");
777 783 char class_name[256];
778 784 int class_count = 0;
779 785
780 786 if (file != NULL) {
781 787 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
782 788 if (*class_name == '#') { // comment
783 789 continue;
784 790 }
785 791 // Remove trailing newline
786 792 size_t name_len = strlen(class_name);
787 793 if (class_name[name_len-1] == '\n') {
788 794 class_name[name_len-1] = '\0';
789 795 }
790 796
791 797 // Got a class name - load it.
792 798 TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD);
793 799 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol.");
794 800 Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol,
795 801 THREAD);
796 802 CLEAR_PENDING_EXCEPTION;
797 803 if (klass != NULL) {
798 804 if (PrintSharedSpaces && Verbose && WizardMode) {
799 805 tty->print_cr("Shared spaces preloaded: %s", class_name);
800 806 }
801 807
802 808 InstanceKlass* ik = InstanceKlass::cast(klass);
803 809
804 810 // Should be class load order as per -XX:+TraceClassLoadingPreorder
805 811 class_promote_order->append(ik);
806 812
807 813 // Link the class to cause the bytecodes to be rewritten and the
808 814 // cpcache to be created. The linking is done as soon as classes
809 815 // are loaded in order that the related data structures (klass and
810 816 // cpCache) are located together.
811 817 try_link_class(ik, THREAD);
812 818 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
813 819
814 820 class_count++;
815 821 } else {
816 822 //tty->print_cr("Preload failed: %s", class_name);
817 823 }
818 824 }
819 825 fclose(file);
820 826 } else {
821 827 char errmsg[JVM_MAXPATHLEN];
822 828 os::lasterror(errmsg, JVM_MAXPATHLEN);
823 829 tty->print_cr("Loading classlist failed: %s", errmsg);
824 830 exit(1);
825 831 }
826 832
827 833 return class_count;
828 834 }
829 835
830 836 // Returns true if the class's status has changed
831 837 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
832 838 assert(DumpSharedSpaces, "should only be called during dumping");
833 839 if (ik->init_state() < InstanceKlass::linked) {
834 840 bool saved = BytecodeVerificationLocal;
835 841 if (!SharedClassUtil::is_shared_boot_class(ik)) {
836 842 // The verification decision is based on BytecodeVerificationRemote
837 843 // for non-system classes. Since we are using the NULL classloader
838 844 // to load non-system classes during dumping, we need to temporarily
839 845 // change BytecodeVerificationLocal to be the same as
840 846 // BytecodeVerificationRemote. Note this can cause the parent system
841 847 // classes also being verified. The extra overhead is acceptable during
842 848 // dumping.
843 849 BytecodeVerificationLocal = BytecodeVerificationRemote;
844 850 }
845 851 ik->link_class(THREAD);
846 852 if (HAS_PENDING_EXCEPTION) {
847 853 ResourceMark rm;
848 854 tty->print_cr("Preload Error: Verification failed for %s",
849 855 ik->external_name());
850 856 CLEAR_PENDING_EXCEPTION;
851 857 ik->set_in_error_state();
852 858 _has_error_classes = true;
853 859 }
854 860 BytecodeVerificationLocal = saved;
855 861 return true;
856 862 } else {
857 863 return false;
858 864 }
859 865 }
860 866
861 867 // Closure for serializing initialization data in from a data area
862 868 // (ptr_array) read from the shared file.
863 869
864 870 class ReadClosure : public SerializeClosure {
865 871 private:
866 872 intptr_t** _ptr_array;
867 873
868 874 inline intptr_t nextPtr() {
869 875 return *(*_ptr_array)++;
870 876 }
871 877
872 878 public:
873 879 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
874 880
875 881 void do_ptr(void** p) {
876 882 assert(*p == NULL, "initializing previous initialized pointer.");
877 883 intptr_t obj = nextPtr();
878 884 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
879 885 "hit tag while initializing ptrs.");
880 886 *p = (void*)obj;
881 887 }
882 888
883 889 void do_tag(int tag) {
884 890 int old_tag;
885 891 old_tag = (int)(intptr_t)nextPtr();
886 892 // do_int(&old_tag);
887 893 assert(tag == old_tag, "old tag doesn't match");
888 894 FileMapInfo::assert_mark(tag == old_tag);
889 895 }
890 896
891 897 void do_region(u_char* start, size_t size) {
892 898 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
893 899 assert(size % sizeof(intptr_t) == 0, "bad size");
894 900 do_tag((int)size);
895 901 while (size > 0) {
896 902 *(intptr_t*)start = nextPtr();
897 903 start += sizeof(intptr_t);
898 904 size -= sizeof(intptr_t);
899 905 }
900 906 }
901 907
902 908 bool reading() const { return true; }
903 909 };
904 910
905 911 // Return true if given address is in the mapped shared space.
906 912 bool MetaspaceShared::is_in_shared_space(const void* p) {
907 913 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
908 914 }
909 915
910 916 void MetaspaceShared::print_shared_spaces() {
911 917 if (UseSharedSpaces) {
912 918 FileMapInfo::current_info()->print_shared_spaces();
913 919 }
914 920 }
915 921
916 922
917 923 // Map shared spaces at requested addresses and return if succeeded.
918 924 // Need to keep the bounds of the ro and rw space for the Metaspace::contains
919 925 // call, or is_in_shared_space.
920 926 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
921 927 size_t image_alignment = mapinfo->alignment();
922 928
923 929 #ifndef _WINDOWS
924 930 // Map in the shared memory and then map the regions on top of it.
925 931 // On Windows, don't map the memory here because it will cause the
926 932 // mappings of the regions to fail.
927 933 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
928 934 if (!shared_rs.is_reserved()) return false;
929 935 #endif
930 936
931 937 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
932 938
933 939 char* _ro_base = NULL;
934 940 char* _rw_base = NULL;
935 941 char* _md_base = NULL;
936 942 char* _mc_base = NULL;
937 943
938 944 // Map each shared region
939 945 if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
940 946 mapinfo->verify_region_checksum(ro) &&
941 947 (_rw_base = mapinfo->map_region(rw)) != NULL &&
942 948 mapinfo->verify_region_checksum(rw) &&
943 949 (_md_base = mapinfo->map_region(md)) != NULL &&
944 950 mapinfo->verify_region_checksum(md) &&
945 951 (_mc_base = mapinfo->map_region(mc)) != NULL &&
946 952 mapinfo->verify_region_checksum(mc) &&
947 953 (image_alignment == (size_t)max_alignment()) &&
948 954 mapinfo->validate_classpath_entry_table()) {
949 955 // Success (no need to do anything)
950 956 return true;
951 957 } else {
952 958 // If there was a failure in mapping any of the spaces, unmap the ones
953 959 // that succeeded
954 960 if (_ro_base != NULL) mapinfo->unmap_region(ro);
955 961 if (_rw_base != NULL) mapinfo->unmap_region(rw);
956 962 if (_md_base != NULL) mapinfo->unmap_region(md);
957 963 if (_mc_base != NULL) mapinfo->unmap_region(mc);
958 964 #ifndef _WINDOWS
959 965 // Release the entire mapped region
960 966 shared_rs.release();
961 967 #endif
962 968 // If -Xshare:on is specified, print out the error message and exit VM,
963 969 // otherwise, set UseSharedSpaces to false and continue.
964 970 if (RequireSharedSpaces) {
965 971 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
966 972 } else {
967 973 FLAG_SET_DEFAULT(UseSharedSpaces, false);
968 974 }
969 975 return false;
970 976 }
971 977 }
972 978
973 979 // Read the miscellaneous data from the shared file, and
974 980 // serialize it out to its various destinations.
975 981
976 982 void MetaspaceShared::initialize_shared_spaces() {
977 983 FileMapInfo *mapinfo = FileMapInfo::current_info();
978 984
979 985 char* buffer = mapinfo->region_base(md);
980 986
981 987 // Skip over (reserve space for) a list of addresses of C++ vtables
982 988 // for Klass objects. They get filled in later.
983 989
984 990 void** vtbl_list = (void**)buffer;
985 991 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*);
986 992 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
987 993
988 994 // Skip over (reserve space for) dummy C++ vtables Klass objects.
989 995 // They are used as is.
990 996
991 997 intptr_t vtable_size = *(intptr_t*)buffer;
992 998 buffer += sizeof(intptr_t);
993 999 buffer += vtable_size;
994 1000
995 1001 // Create the symbol table using the bucket array at this spot in the
996 1002 // misc data space. Since the symbol table is often modified, this
997 1003 // region (of mapped pages) will be copy-on-write.
998 1004
999 1005 int symbolTableLen = *(intptr_t*)buffer;
1000 1006 buffer += sizeof(intptr_t);
1001 1007 int number_of_entries = *(intptr_t*)buffer;
1002 1008 buffer += sizeof(intptr_t);
1003 1009 SymbolTable::create_table((HashtableBucket<mtSymbol>*)buffer, symbolTableLen,
1004 1010 number_of_entries);
1005 1011 buffer += symbolTableLen;
1006 1012
1007 1013 // Create the shared dictionary using the bucket array at this spot in
1008 1014 // the misc data space. Since the shared dictionary table is never
1009 1015 // modified, this region (of mapped pages) will be (effectively, if
1010 1016 // not explicitly) read-only.
1011 1017
1012 1018 int sharedDictionaryLen = *(intptr_t*)buffer;
1013 1019 buffer += sizeof(intptr_t);
1014 1020 number_of_entries = *(intptr_t*)buffer;
1015 1021 buffer += sizeof(intptr_t);
1016 1022 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1017 1023 sharedDictionaryLen,
1018 1024 number_of_entries);
1019 1025 buffer += sharedDictionaryLen;
1020 1026
1021 1027 // Create the package info table using the bucket array at this spot in
1022 1028 // the misc data space. Since the package info table is never
1023 1029 // modified, this region (of mapped pages) will be (effectively, if
1024 1030 // not explicitly) read-only.
1025 1031
1026 1032 int pkgInfoLen = *(intptr_t*)buffer;
1027 1033 buffer += sizeof(intptr_t);
1028 1034 number_of_entries = *(intptr_t*)buffer;
1029 1035 buffer += sizeof(intptr_t);
1030 1036 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen,
1031 1037 number_of_entries);
1032 1038 buffer += pkgInfoLen;
1033 1039 ClassLoader::verify();
1034 1040
1035 1041 // The following data in the shared misc data region are the linked
1036 1042 // list elements (HashtableEntry objects) for the symbol table, string
1037 1043 // table, and shared dictionary. The heap objects refered to by the
1038 1044 // symbol table, string table, and shared dictionary are permanent and
1039 1045 // unmovable. Since new entries added to the string and symbol tables
1040 1046 // are always added at the beginning of the linked lists, THESE LINKED
1041 1047 // LIST ELEMENTS ARE READ-ONLY.
1042 1048
1043 1049 int len = *(intptr_t*)buffer; // skip over symbol table entries
1044 1050 buffer += sizeof(intptr_t);
1045 1051 buffer += len;
1046 1052
1047 1053 len = *(intptr_t*)buffer; // skip over shared dictionary entries
1048 1054 buffer += sizeof(intptr_t);
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1049 1055 buffer += len;
1050 1056
1051 1057 len = *(intptr_t*)buffer; // skip over package info table entries
1052 1058 buffer += sizeof(intptr_t);
1053 1059 buffer += len;
1054 1060
1055 1061 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
1056 1062 buffer += sizeof(intptr_t);
1057 1063 buffer += len;
1058 1064
1065 + buffer = ClassLoaderExt::restore_lookup_cache_from_archive(buffer);
1066 +
1059 1067 intptr_t* array = (intptr_t*)buffer;
1060 1068 ReadClosure rc(&array);
1061 1069 serialize(&rc);
1062 1070
1063 1071 // Close the mapinfo file
1064 1072 mapinfo->close();
1065 1073
1066 1074 if (PrintSharedArchiveAndExit) {
1067 1075 if (PrintSharedDictionary) {
1068 1076 tty->print_cr("\nShared classes:\n");
1069 1077 SystemDictionary::print_shared(false);
1070 1078 }
1071 1079 if (_archive_loading_failed) {
1072 1080 tty->print_cr("archive is invalid");
1073 1081 vm_exit(1);
1074 1082 } else {
1075 1083 tty->print_cr("archive is valid");
1076 1084 vm_exit(0);
1077 1085 }
1078 1086 }
1079 1087 }
1080 1088
1081 1089 // JVM/TI RedefineClasses() support:
1082 1090 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1083 1091 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1084 1092
1085 1093 if (UseSharedSpaces) {
1086 1094 // remap the shared readonly space to shared readwrite, private
1087 1095 FileMapInfo* mapinfo = FileMapInfo::current_info();
1088 1096 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1089 1097 return false;
1090 1098 }
1091 1099 }
1092 1100 return true;
1093 1101 }
1094 1102
1095 1103 int MetaspaceShared::count_class(const char* classlist_file) {
1096 1104 if (classlist_file == NULL) {
1097 1105 return 0;
1098 1106 }
1099 1107 char class_name[256];
1100 1108 int class_count = 0;
1101 1109 FILE* file = fopen(classlist_file, "r");
1102 1110 if (file != NULL) {
1103 1111 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
1104 1112 if (*class_name == '#') { // comment
1105 1113 continue;
1106 1114 }
1107 1115 class_count++;
1108 1116 }
1109 1117 fclose(file);
1110 1118 } else {
1111 1119 char errmsg[JVM_MAXPATHLEN];
1112 1120 os::lasterror(errmsg, JVM_MAXPATHLEN);
1113 1121 tty->print_cr("Loading classlist failed: %s", errmsg);
1114 1122 exit(1);
1115 1123 }
1116 1124
1117 1125 return class_count;
1118 1126 }
1119 1127
1120 1128 // the sizes are good for typical large applications that have a lot of shared
1121 1129 // classes
1122 1130 void MetaspaceShared::estimate_regions_size() {
1123 1131 int class_count = count_class(SharedClassListFile);
1124 1132 class_count += count_class(ExtraSharedClassListFile);
1125 1133
1126 1134 if (class_count > LargeThresholdClassCount) {
1127 1135 if (class_count < HugeThresholdClassCount) {
1128 1136 SET_ESTIMATED_SIZE(Large, ReadOnly);
1129 1137 SET_ESTIMATED_SIZE(Large, ReadWrite);
1130 1138 SET_ESTIMATED_SIZE(Large, MiscData);
1131 1139 SET_ESTIMATED_SIZE(Large, MiscCode);
1132 1140 } else {
1133 1141 SET_ESTIMATED_SIZE(Huge, ReadOnly);
1134 1142 SET_ESTIMATED_SIZE(Huge, ReadWrite);
1135 1143 SET_ESTIMATED_SIZE(Huge, MiscData);
1136 1144 SET_ESTIMATED_SIZE(Huge, MiscCode);
1137 1145 }
1138 1146 }
1139 1147 }
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