1 /*
2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/dictionary.hpp"
27 #include "classfile/loaderConstraints.hpp"
28 #include "classfile/placeholders.hpp"
29 #include "classfile/sharedClassUtil.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "code/codeCache.hpp"
33 #include "gc/shared/gcLocker.hpp"
34 #include "interpreter/bytecodeStream.hpp"
35 #include "interpreter/bytecodes.hpp"
36 #include "memory/filemap.hpp"
37 #include "memory/metaspace.hpp"
38 #include "memory/metaspaceShared.hpp"
39 #include "oops/objArrayOop.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "runtime/os.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/vmThread.hpp"
44 #include "runtime/vm_operations.hpp"
45 #include "utilities/hashtable.inline.hpp"
46
47 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
48
49 int MetaspaceShared::_max_alignment = 0;
50
51 ReservedSpace* MetaspaceShared::_shared_rs = NULL;
52
53 MetaspaceSharedStats MetaspaceShared::_stats;
54
55 bool MetaspaceShared::_link_classes_made_progress;
56 bool MetaspaceShared::_check_classes_made_progress;
57 bool MetaspaceShared::_has_error_classes;
58 bool MetaspaceShared::_archive_loading_failed = false;
59 // Read/write a data stream for restoring/preserving metadata pointers and
60 // miscellaneous data from/to the shared archive file.
61
62 void MetaspaceShared::serialize(SerializeClosure* soc) {
63 int tag = 0;
64 soc->do_tag(--tag);
65
66 // Verify the sizes of various metadata in the system.
67 soc->do_tag(sizeof(Method));
68 soc->do_tag(sizeof(ConstMethod));
69 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
70 soc->do_tag(sizeof(ConstantPool));
71 soc->do_tag(sizeof(ConstantPoolCache));
72 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
73 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
74 soc->do_tag(sizeof(Symbol));
75
76 // Dump/restore miscellaneous metadata.
77 Universe::serialize(soc, true);
78 soc->do_tag(--tag);
79
80 // Dump/restore references to commonly used names and signatures.
81 vmSymbols::serialize(soc);
82 soc->do_tag(--tag);
83
84 soc->do_tag(666);
85 }
86
87
88 // CDS code for dumping shared archive.
89
90 // Global object for holding classes that have been loaded. Since this
91 // is run at a safepoint just before exit, this is the entire set of classes.
92 static GrowableArray<Klass*>* _global_klass_objects;
93 static void collect_classes(Klass* k) {
94 _global_klass_objects->append_if_missing(k);
95 if (k->oop_is_instance()) {
96 // Add in the array classes too
97 InstanceKlass* ik = InstanceKlass::cast(k);
98 ik->array_klasses_do(collect_classes);
99 }
100 }
101
102 static void remove_unshareable_in_classes() {
103 for (int i = 0; i < _global_klass_objects->length(); i++) {
104 Klass* k = _global_klass_objects->at(i);
105 k->remove_unshareable_info();
106 }
107 }
108
109 static void rewrite_nofast_bytecode(Method* method) {
110 RawBytecodeStream bcs(method);
111 while (!bcs.is_last_bytecode()) {
112 Bytecodes::Code opcode = bcs.raw_next();
113 switch (opcode) {
114 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
115 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
116 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
117 case Bytecodes::_iload: *bcs.bcp() = Bytecodes::_nofast_iload; break;
118 default: break;
119 }
120 }
121 }
122
123 // Walk all methods in the class list to ensure that they won't be modified at
124 // run time. This includes:
125 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
126 // at run time by RewriteBytecodes/RewriteFrequentPairs
127 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
128 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
129 for (int i = 0; i < _global_klass_objects->length(); i++) {
130 Klass* k = _global_klass_objects->at(i);
131 if (k->oop_is_instance()) {
132 InstanceKlass* ik = InstanceKlass::cast(k);
133 for (int i = 0; i < ik->methods()->length(); i++) {
134 Method* m = ik->methods()->at(i);
135 rewrite_nofast_bytecode(m);
136 Fingerprinter fp(m);
137 // The side effect of this call sets method's fingerprint field.
138 fp.fingerprint();
139 }
140 }
141 }
142 }
143
144 // Patch C++ vtable pointer in metadata.
145
146 // Klass and other metadata objects contain references to c++ vtables in the
147 // JVM library.
148 // Fix them to point to our constructed vtables. However, don't iterate
149 // across the space while doing this, as that causes the vtables to be
150 // patched, undoing our useful work. Instead, iterate to make a list,
151 // then use the list to do the fixing.
152 //
153 // Our constructed vtables:
154 // Dump time:
155 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs
156 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list
157 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and
158 // associated metadata to point to jump table rather than to current vtbl
159 // Table layout: NOTE FIXED SIZE
160 // 1. vtbl pointers
161 // 2. #Klass X #virtual methods per Klass
162 // 1 entry for each, in the order:
163 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry
164 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry
165 // ...
166 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry,
167 // ... Klass<vtbl_list_size>:method<num_virtuals> entry
168 // Sample entry: (Sparc):
169 // save(sp, -256, sp)
170 // ba,pt common_code
171 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255)
172 //
173 // Restore time:
174 // 1. initialize_shared_space: reserve space for table
175 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text
176 //
177 // Execution time:
178 // First virtual method call for any object of these metadata types:
179 // 1. object->klass
180 // 2. vtable entry for that klass points to the jump table entries
181 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index
182 // 4. common_code:
183 // Get address of new vtbl pointer for this Klass from updated table
184 // Update new vtbl pointer in the Klass: future virtual calls go direct
185 // Jump to method, using new vtbl pointer and method index
186
187
188 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) {
189 void* old_vtbl_ptr = *(void**)obj;
190 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) {
191 if (vtbl_list[i] == old_vtbl_ptr) {
192 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals;
193 }
194 }
195 ShouldNotReachHere();
196 return NULL;
197 }
198
199 // Assumes the vtable is in first slot in object.
200 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) {
201 int n = _global_klass_objects->length();
202 for (int i = 0; i < n; i++) {
203 Klass* obj = _global_klass_objects->at(i);
204 // Note oop_is_instance() is a virtual call. After patching vtables
205 // all virtual calls on the dummy vtables will restore the original!
206 if (obj->oop_is_instance()) {
207 InstanceKlass* ik = InstanceKlass::cast(obj);
208 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik);
209 ConstantPool* cp = ik->constants();
210 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp);
211 for (int j = 0; j < ik->methods()->length(); j++) {
212 Method* m = ik->methods()->at(j);
213 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m);
214 }
215 } else {
216 // Array klasses
217 Klass* k = obj;
218 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k);
219 }
220 }
221 }
222
223 // Closure for serializing initialization data out to a data area to be
224 // written to the shared file.
225
226 class WriteClosure : public SerializeClosure {
227 private:
228 intptr_t* top;
229 char* end;
230
231 inline void check_space() {
232 if ((char*)top + sizeof(intptr_t) > end) {
233 report_out_of_shared_space(SharedMiscData);
234 }
235 }
236
237 public:
238 WriteClosure(char* md_top, char* md_end) {
239 top = (intptr_t*)md_top;
240 end = md_end;
241 }
242
243 char* get_top() { return (char*)top; }
244
245 void do_ptr(void** p) {
246 check_space();
247 *top = (intptr_t)*p;
248 ++top;
249 }
250
251 void do_tag(int tag) {
252 check_space();
253 *top = (intptr_t)tag;
254 ++top;
255 }
256
257 void do_region(u_char* start, size_t size) {
258 if ((char*)top + size > end) {
259 report_out_of_shared_space(SharedMiscData);
260 }
261 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
262 assert(size % sizeof(intptr_t) == 0, "bad size");
263 do_tag((int)size);
264 while (size > 0) {
265 *top = *(intptr_t*)start;
266 ++top;
267 start += sizeof(intptr_t);
268 size -= sizeof(intptr_t);
269 }
270 }
271
272 bool reading() const { return false; }
273 };
274
275 // This is for dumping detailed statistics for the allocations
276 // in the shared spaces.
277 class DumpAllocClosure : public Metaspace::AllocRecordClosure {
278 public:
279
280 // Here's poor man's enum inheritance
281 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
282 METASPACE_OBJ_TYPES_DO(f) \
283 f(SymbolHashentry) \
284 f(SymbolBucket) \
285 f(Other)
286
287 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type,
288 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
289
290 enum Type {
291 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
292 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE)
293 _number_of_types
294 };
295
296 static const char * type_name(Type type) {
297 switch(type) {
298 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE)
299 default:
300 ShouldNotReachHere();
301 return NULL;
302 }
303 }
304
305 public:
306 enum {
307 RO = 0,
308 RW = 1
309 };
310
311 int _counts[2][_number_of_types];
312 int _bytes [2][_number_of_types];
313 int _which;
314
315 DumpAllocClosure() {
316 memset(_counts, 0, sizeof(_counts));
317 memset(_bytes, 0, sizeof(_bytes));
318 };
319
320 void iterate_metaspace(Metaspace* space, int which) {
321 assert(which == RO || which == RW, "sanity");
322 _which = which;
323 space->iterate(this);
324 }
325
326 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) {
327 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
328 _counts[_which][type] ++;
329 _bytes [_which][type] += byte_size;
330 }
331
332 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all);
333 };
334
335 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) {
336 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write
337 int other_bytes = md_all + mc_all;
338
339 // Calculate size of data that was not allocated by Metaspace::allocate()
340 MetaspaceSharedStats *stats = MetaspaceShared::stats();
341
342 // symbols
343 _counts[RW][SymbolHashentryType] = stats->symbol.hashentry_count;
344 _bytes [RW][SymbolHashentryType] = stats->symbol.hashentry_bytes;
345 other_bytes -= stats->symbol.hashentry_bytes;
346
347 _counts[RW][SymbolBucketType] = stats->symbol.bucket_count;
348 _bytes [RW][SymbolBucketType] = stats->symbol.bucket_bytes;
349 other_bytes -= stats->symbol.bucket_bytes;
350
351 // TODO: count things like dictionary, vtable, etc
352 _bytes[RW][OtherType] = other_bytes;
353
354 // prevent divide-by-zero
355 if (ro_all < 1) {
356 ro_all = 1;
357 }
358 if (rw_all < 1) {
359 rw_all = 1;
360 }
361
362 int all_ro_count = 0;
363 int all_ro_bytes = 0;
364 int all_rw_count = 0;
365 int all_rw_bytes = 0;
366
367 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
368 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
369 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
370 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
371
372 tty->print_cr("Detailed metadata info (rw includes md and mc):");
373 tty->print_cr("%s", hdr);
374 tty->print_cr("%s", sep);
375 for (int type = 0; type < int(_number_of_types); type ++) {
376 const char *name = type_name((Type)type);
377 int ro_count = _counts[RO][type];
378 int ro_bytes = _bytes [RO][type];
379 int rw_count = _counts[RW][type];
380 int rw_bytes = _bytes [RW][type];
381 int count = ro_count + rw_count;
382 int bytes = ro_bytes + rw_bytes;
383
384 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
385 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
386 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
387
388 tty->print_cr(fmt_stats, name,
389 ro_count, ro_bytes, ro_perc,
390 rw_count, rw_bytes, rw_perc,
391 count, bytes, perc);
392
393 all_ro_count += ro_count;
394 all_ro_bytes += ro_bytes;
395 all_rw_count += rw_count;
396 all_rw_bytes += rw_bytes;
397 }
398
399 int all_count = all_ro_count + all_rw_count;
400 int all_bytes = all_ro_bytes + all_rw_bytes;
401
402 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
403 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
404 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
405
406 tty->print_cr("%s", sep);
407 tty->print_cr(fmt_stats, "Total",
408 all_ro_count, all_ro_bytes, all_ro_perc,
409 all_rw_count, all_rw_bytes, all_rw_perc,
410 all_count, all_bytes, all_perc);
411
412 assert(all_ro_bytes == ro_all, "everything should have been counted");
413 assert(all_rw_bytes == rw_all, "everything should have been counted");
414 #undef fmt_stats
415 }
416
417 // Populate the shared space.
418
419 class VM_PopulateDumpSharedSpace: public VM_Operation {
420 private:
421 ClassLoaderData* _loader_data;
422 GrowableArray<Klass*> *_class_promote_order;
423 VirtualSpace _md_vs;
424 VirtualSpace _mc_vs;
425 CompactHashtableWriter* _string_cht;
426 GrowableArray<MemRegion> *_string_regions;
427
428 public:
429 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data,
430 GrowableArray<Klass*> *class_promote_order) :
431 _loader_data(loader_data) {
432
433 // Split up and initialize the misc code and data spaces
434 ReservedSpace* shared_rs = MetaspaceShared::shared_rs();
435 size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize;
436 ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size);
437 ReservedSpace misc_section = shared_rs->last_part(metadata_size);
438
439 // Now split into misc sections.
440 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize);
441 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize);
442 _md_vs.initialize(md_rs, SharedMiscDataSize);
443 _mc_vs.initialize(mc_rs, SharedMiscCodeSize);
444 _class_promote_order = class_promote_order;
445 }
446
447 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
448 void doit(); // outline because gdb sucks
449
450 private:
451 void handle_misc_data_space_failure(bool success) {
452 if (!success) {
453 report_out_of_shared_space(SharedMiscData);
454 }
455 }
456 }; // class VM_PopulateDumpSharedSpace
457
458
459 void VM_PopulateDumpSharedSpace::doit() {
460 Thread* THREAD = VMThread::vm_thread();
461 NOT_PRODUCT(SystemDictionary::verify();)
462 // The following guarantee is meant to ensure that no loader constraints
463 // exist yet, since the constraints table is not shared. This becomes
464 // more important now that we don't re-initialize vtables/itables for
465 // shared classes at runtime, where constraints were previously created.
466 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
467 "loader constraints are not saved");
468 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
469 "placeholders are not saved");
470 // Revisit and implement this if we prelink method handle call sites:
471 guarantee(SystemDictionary::invoke_method_table() == NULL ||
472 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
473 "invoke method table is not saved");
474
475 // At this point, many classes have been loaded.
476 // Gather systemDictionary classes in a global array and do everything to
477 // that so we don't have to walk the SystemDictionary again.
478 _global_klass_objects = new GrowableArray<Klass*>(1000);
479 Universe::basic_type_classes_do(collect_classes);
480 SystemDictionary::classes_do(collect_classes);
481
482 tty->print_cr("Number of classes %d", _global_klass_objects->length());
483 {
484 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
485 for (int i = 0; i < _global_klass_objects->length(); i++) {
486 Klass* k = _global_klass_objects->at(i);
487 if (k->oop_is_instance()) {
488 num_inst ++;
489 } else if (k->oop_is_objArray()) {
490 num_obj_array ++;
491 } else {
492 assert(k->oop_is_typeArray(), "sanity");
493 num_type_array ++;
494 }
495 }
496 tty->print_cr(" instance classes = %5d", num_inst);
497 tty->print_cr(" obj array classes = %5d", num_obj_array);
498 tty->print_cr(" type array classes = %5d", num_type_array);
499 }
500
501
502 // Ensure the ConstMethods won't be modified at run-time
503 tty->print("Updating ConstMethods ... ");
504 rewrite_nofast_bytecodes_and_calculate_fingerprints();
505 tty->print_cr("done. ");
506
507 // Remove all references outside the metadata
508 tty->print("Removing unshareable information ... ");
509 remove_unshareable_in_classes();
510 tty->print_cr("done. ");
511
512 // Set up the share data and shared code segments.
513 char* md_low = _md_vs.low();
514 char* md_top = md_low;
515 char* md_end = _md_vs.high();
516 char* mc_low = _mc_vs.low();
517 char* mc_top = mc_low;
518 char* mc_end = _mc_vs.high();
519
520 // Reserve space for the list of Klass*s whose vtables are used
521 // for patching others as needed.
522
523 void** vtbl_list = (void**)md_top;
524 int vtbl_list_size = MetaspaceShared::vtbl_list_size;
525 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
526
527 md_top += vtbl_list_size * sizeof(void*);
528 void* vtable = md_top;
529
530 // Reserve space for a new dummy vtable for klass objects in the
531 // heap. Generate self-patching vtable entries.
532
533 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable,
534 &md_top, md_end,
535 &mc_top, mc_end);
536
537 // Reorder the system dictionary. (Moving the symbols affects
538 // how the hash table indices are calculated.)
539 // Not doing this either.
540
541 SystemDictionary::reorder_dictionary();
542
543 NOT_PRODUCT(SystemDictionary::verify();)
544
545 // Copy the the symbol table, string table, and the system dictionary to the shared
546 // space in usable form. Copy the hashtable
547 // buckets first [read-write], then copy the linked lists of entries
548 // [read-only].
549
550 NOT_PRODUCT(SymbolTable::verify());
551 handle_misc_data_space_failure(SymbolTable::copy_compact_table(&md_top, md_end));
552
553 size_t ss_bytes = 0;
554 char* ss_low;
555 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details.
556 _string_regions = new GrowableArray<MemRegion>(2);
557 NOT_PRODUCT(StringTable::verify());
558 handle_misc_data_space_failure(StringTable::copy_compact_table(&md_top, md_end, _string_regions,
559 &ss_bytes));
560 ss_low = _string_regions->is_empty() ? NULL : (char*)_string_regions->first().start();
561
562 SystemDictionary::reverse();
563 SystemDictionary::copy_buckets(&md_top, md_end);
564
565 ClassLoader::verify();
566 ClassLoader::copy_package_info_buckets(&md_top, md_end);
567 ClassLoader::verify();
568
569 SystemDictionary::copy_table(&md_top, md_end);
570 ClassLoader::verify();
571 ClassLoader::copy_package_info_table(&md_top, md_end);
572 ClassLoader::verify();
573
574 // Write the other data to the output array.
575 WriteClosure wc(md_top, md_end);
576 MetaspaceShared::serialize(&wc);
577 md_top = wc.get_top();
578
579 // Print shared spaces all the time
580 // To make fmt_space be a syntactic constant (for format warnings), use #define.
581 #define fmt_space "%s space: %9d [ %4.1f%% of total] out of %9d bytes [%4.1f%% used] at " INTPTR_FORMAT
582 Metaspace* ro_space = _loader_data->ro_metaspace();
583 Metaspace* rw_space = _loader_data->rw_metaspace();
584
585 // Allocated size of each space (may not be all occupied)
586 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType);
587 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType);
588 const size_t md_alloced = md_end-md_low;
589 const size_t mc_alloced = mc_end-mc_low;
590 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced
591 + ss_bytes;
592
593 // Occupied size of each space.
594 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType);
595 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType);
596 const size_t md_bytes = size_t(md_top - md_low);
597 const size_t mc_bytes = size_t(mc_top - mc_low);
598
599 // Percent of total size
600 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes + ss_bytes;
601 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0;
602 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0;
603 const double md_t_perc = md_bytes / double(total_bytes) * 100.0;
604 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0;
605 const double ss_t_perc = ss_bytes / double(total_bytes) * 100.0;
606
607 // Percent of fullness of each space
608 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0;
609 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0;
610 const double md_u_perc = md_bytes / double(md_alloced) * 100.0;
611 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0;
612 const double total_u_perc = total_bytes / double(total_alloced) * 100.0;
613
614 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, ro_space->bottom());
615 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, rw_space->bottom());
616 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, md_low);
617 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, mc_low);
618 tty->print_cr(fmt_space, "st", ss_bytes, ss_t_perc, ss_bytes, 100.0, ss_low);
619 tty->print_cr("total : %9d [100.0%% of total] out of %9d bytes [%4.1f%% used]",
620 total_bytes, total_alloced, total_u_perc);
621
622 // Update the vtable pointers in all of the Klass objects in the
623 // heap. They should point to newly generated vtable.
624 patch_klass_vtables(vtbl_list, vtable);
625
626 // dunno what this is for.
627 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass);
628 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
629 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
630
631 // Create and write the archive file that maps the shared spaces.
632
633 FileMapInfo* mapinfo = new FileMapInfo();
634 mapinfo->populate_header(MetaspaceShared::max_alignment());
635
636 // Pass 1 - update file offsets in header.
637 mapinfo->write_header();
638 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
639 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
640 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
641 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
642 SharedMiscDataSize,
643 false, false);
644 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
645 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
646 SharedMiscCodeSize,
647 true, true);
648 mapinfo->write_string_regions(_string_regions);
649
650 // Pass 2 - write data.
651 mapinfo->open_for_write();
652 mapinfo->set_header_crc(mapinfo->compute_header_crc());
653 mapinfo->write_header();
654 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
655 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
656 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
657 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
658 SharedMiscDataSize,
659 false, false);
660 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
661 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
662 SharedMiscCodeSize,
663 true, true);
664 mapinfo->write_string_regions(_string_regions);
665
666 mapinfo->close();
667
668 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
669 os::free(saved_vtbl);
670
671 if (PrintSharedSpaces) {
672 DumpAllocClosure dac;
673 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO);
674 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW);
675
676 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes));
677 }
678 #undef fmt_space
679 }
680
681
682 void MetaspaceShared::link_one_shared_class(Klass* obj, TRAPS) {
683 Klass* k = obj;
684 if (k->oop_is_instance()) {
685 InstanceKlass* ik = (InstanceKlass*) k;
686 // Link the class to cause the bytecodes to be rewritten and the
687 // cpcache to be created. Class verification is done according
688 // to -Xverify setting.
689 _link_classes_made_progress |= try_link_class(ik, THREAD);
690 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
691 }
692 }
693
694 void MetaspaceShared::check_one_shared_class(Klass* k) {
695 if (k->oop_is_instance() && InstanceKlass::cast(k)->check_sharing_error_state()) {
696 _check_classes_made_progress = true;
697 }
698 }
699
700 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
701 // We need to iterate because verification may cause additional classes
702 // to be loaded.
703 do {
704 _link_classes_made_progress = false;
705 SystemDictionary::classes_do(link_one_shared_class, THREAD);
706 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
707 } while (_link_classes_made_progress);
708
709 if (_has_error_classes) {
710 // Mark all classes whose super class or interfaces failed verification.
711 do {
712 // Not completely sure if we need to do this iteratively. Anyway,
713 // we should come here only if there are unverifiable classes, which
714 // shouldn't happen in normal cases. So better safe than sorry.
715 _check_classes_made_progress = false;
716 SystemDictionary::classes_do(check_one_shared_class);
717 } while (_check_classes_made_progress);
718
719 if (IgnoreUnverifiableClassesDuringDump) {
720 // This is useful when running JCK or SQE tests. You should not
721 // enable this when running real apps.
722 SystemDictionary::remove_classes_in_error_state();
723 } else {
724 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
725 exit(1);
726 }
727 }
728 }
729
730 void MetaspaceShared::prepare_for_dumping() {
731 ClassLoader::initialize_shared_path();
732 FileMapInfo::allocate_classpath_entry_table();
733 }
734
735 // Preload classes from a list, populate the shared spaces and dump to a
736 // file.
737 void MetaspaceShared::preload_and_dump(TRAPS) {
738 TraceTime timer("Dump Shared Spaces", TraceStartupTime);
739 ResourceMark rm;
740
741 tty->print_cr("Allocated shared space: %d bytes at " PTR_FORMAT,
742 MetaspaceShared::shared_rs()->size(),
743 MetaspaceShared::shared_rs()->base());
744
745 // Preload classes to be shared.
746 // Should use some os:: method rather than fopen() here. aB.
747 const char* class_list_path;
748 if (SharedClassListFile == NULL) {
749 // Construct the path to the class list (in jre/lib)
750 // Walk up two directories from the location of the VM and
751 // optionally tack on "lib" (depending on platform)
752 char class_list_path_str[JVM_MAXPATHLEN];
753 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
754 for (int i = 0; i < 3; i++) {
755 char *end = strrchr(class_list_path_str, *os::file_separator());
756 if (end != NULL) *end = '\0';
757 }
758 int class_list_path_len = (int)strlen(class_list_path_str);
759 if (class_list_path_len >= 3) {
760 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
761 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
762 jio_snprintf(class_list_path_str + class_list_path_len,
763 sizeof(class_list_path_str) - class_list_path_len,
764 "%slib", os::file_separator());
765 class_list_path_len += 4;
766 }
767 }
768 }
769 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
770 jio_snprintf(class_list_path_str + class_list_path_len,
771 sizeof(class_list_path_str) - class_list_path_len,
772 "%sclasslist", os::file_separator());
773 }
774 class_list_path = class_list_path_str;
775 } else {
776 class_list_path = SharedClassListFile;
777 }
778
779 int class_count = 0;
780 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
781
782 // sun.io.Converters
783 static const char obj_array_sig[] = "[[Ljava/lang/Object;";
784 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
785
786 // java.util.HashMap
787 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
788 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
789
790 tty->print_cr("Loading classes to share ...");
791 _has_error_classes = false;
792 class_count += preload_and_dump(class_list_path, class_promote_order,
793 THREAD);
794 if (ExtraSharedClassListFile) {
795 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
796 THREAD);
797 }
798 tty->print_cr("Loading classes to share: done.");
799
800 if (PrintSharedSpaces) {
801 tty->print_cr("Shared spaces: preloaded %d classes", class_count);
802 }
803
804 // Rewrite and link classes
805 tty->print_cr("Rewriting and linking classes ...");
806
807 // Link any classes which got missed. This would happen if we have loaded classes that
808 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
809 // fails verification, all other interfaces that were not specified in the classlist but
810 // are implemented by K are not verified.
811 link_and_cleanup_shared_classes(CATCH);
812 tty->print_cr("Rewriting and linking classes: done");
813
814 // Create and dump the shared spaces. Everything so far is loaded
815 // with the null class loader.
816 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
817 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
818 VMThread::execute(&op);
819
820 // Since various initialization steps have been undone by this process,
821 // it is not reasonable to continue running a java process.
822 exit(0);
823 }
824
825 int MetaspaceShared::preload_and_dump(const char * class_list_path,
826 GrowableArray<Klass*>* class_promote_order,
827 TRAPS) {
828 FILE* file = fopen(class_list_path, "r");
829 char class_name[256];
830 int class_count = 0;
831
832 if (file != NULL) {
833 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
834 if (*class_name == '#') { // comment
835 continue;
836 }
837 // Remove trailing newline
838 size_t name_len = strlen(class_name);
839 if (class_name[name_len-1] == '\n') {
840 class_name[name_len-1] = '\0';
841 }
842
843 // Got a class name - load it.
844 TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD);
845 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol.");
846 Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol,
847 THREAD);
848 CLEAR_PENDING_EXCEPTION;
849 if (klass != NULL) {
850 if (PrintSharedSpaces && Verbose && WizardMode) {
851 tty->print_cr("Shared spaces preloaded: %s", class_name);
852 }
853
854 InstanceKlass* ik = InstanceKlass::cast(klass);
855
856 // Should be class load order as per -XX:+TraceClassLoadingPreorder
857 class_promote_order->append(ik);
858
859 // Link the class to cause the bytecodes to be rewritten and the
860 // cpcache to be created. The linking is done as soon as classes
861 // are loaded in order that the related data structures (klass and
862 // cpCache) are located together.
863 try_link_class(ik, THREAD);
864 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
865
866 class_count++;
867 } else {
868 //tty->print_cr("Preload failed: %s", class_name);
869 }
870 }
871 fclose(file);
872 } else {
873 char errmsg[JVM_MAXPATHLEN];
874 os::lasterror(errmsg, JVM_MAXPATHLEN);
875 tty->print_cr("Loading classlist failed: %s", errmsg);
876 exit(1);
877 }
878
879 return class_count;
880 }
881
882 // Returns true if the class's status has changed
883 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
884 assert(DumpSharedSpaces, "should only be called during dumping");
885 if (ik->init_state() < InstanceKlass::linked) {
886 bool saved = BytecodeVerificationLocal;
887 if (!SharedClassUtil::is_shared_boot_class(ik)) {
888 // The verification decision is based on BytecodeVerificationRemote
889 // for non-system classes. Since we are using the NULL classloader
890 // to load non-system classes during dumping, we need to temporarily
891 // change BytecodeVerificationLocal to be the same as
892 // BytecodeVerificationRemote. Note this can cause the parent system
893 // classes also being verified. The extra overhead is acceptable during
894 // dumping.
895 BytecodeVerificationLocal = BytecodeVerificationRemote;
896 }
897 ik->link_class(THREAD);
898 if (HAS_PENDING_EXCEPTION) {
899 ResourceMark rm;
900 tty->print_cr("Preload Warning: Verification failed for %s",
901 ik->external_name());
902 CLEAR_PENDING_EXCEPTION;
903 ik->set_in_error_state();
904 _has_error_classes = true;
905 }
906 BytecodeVerificationLocal = saved;
907 return true;
908 } else {
909 return false;
910 }
911 }
912
913 // Closure for serializing initialization data in from a data area
914 // (ptr_array) read from the shared file.
915
916 class ReadClosure : public SerializeClosure {
917 private:
918 intptr_t** _ptr_array;
919
920 inline intptr_t nextPtr() {
921 return *(*_ptr_array)++;
922 }
923
924 public:
925 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
926
927 void do_ptr(void** p) {
928 assert(*p == NULL, "initializing previous initialized pointer.");
929 intptr_t obj = nextPtr();
930 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
931 "hit tag while initializing ptrs.");
932 *p = (void*)obj;
933 }
934
935 void do_tag(int tag) {
936 int old_tag;
937 old_tag = (int)(intptr_t)nextPtr();
938 // do_int(&old_tag);
939 assert(tag == old_tag, "old tag doesn't match");
940 FileMapInfo::assert_mark(tag == old_tag);
941 }
942
943 void do_region(u_char* start, size_t size) {
944 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
945 assert(size % sizeof(intptr_t) == 0, "bad size");
946 do_tag((int)size);
947 while (size > 0) {
948 *(intptr_t*)start = nextPtr();
949 start += sizeof(intptr_t);
950 size -= sizeof(intptr_t);
951 }
952 }
953
954 bool reading() const { return true; }
955 };
956
957 // Return true if given address is in the mapped shared space.
958 bool MetaspaceShared::is_in_shared_space(const void* p) {
959 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
960 }
961
962 bool MetaspaceShared::is_string_region(int idx) {
963 return (idx >= MetaspaceShared::first_string &&
964 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings);
965 }
966
967 void MetaspaceShared::print_shared_spaces() {
968 if (UseSharedSpaces) {
969 FileMapInfo::current_info()->print_shared_spaces();
970 }
971 }
972
973
974 // Map shared spaces at requested addresses and return if succeeded.
975 // Need to keep the bounds of the ro and rw space for the Metaspace::contains
976 // call, or is_in_shared_space.
977 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
978 size_t image_alignment = mapinfo->alignment();
979
980 #ifndef _WINDOWS
981 // Map in the shared memory and then map the regions on top of it.
982 // On Windows, don't map the memory here because it will cause the
983 // mappings of the regions to fail.
984 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
985 if (!shared_rs.is_reserved()) return false;
986 #endif
987
988 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
989
990 char* _ro_base = NULL;
991 char* _rw_base = NULL;
992 char* _md_base = NULL;
993 char* _mc_base = NULL;
994
995 // Map each shared region
996 if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
997 mapinfo->verify_region_checksum(ro) &&
998 (_rw_base = mapinfo->map_region(rw)) != NULL &&
999 mapinfo->verify_region_checksum(rw) &&
1000 (_md_base = mapinfo->map_region(md)) != NULL &&
1001 mapinfo->verify_region_checksum(md) &&
1002 (_mc_base = mapinfo->map_region(mc)) != NULL &&
1003 mapinfo->verify_region_checksum(mc) &&
1004 (image_alignment == (size_t)max_alignment()) &&
1005 mapinfo->validate_classpath_entry_table()) {
1006 // Success (no need to do anything)
1007 return true;
1008 } else {
1009 // If there was a failure in mapping any of the spaces, unmap the ones
1010 // that succeeded
1011 if (_ro_base != NULL) mapinfo->unmap_region(ro);
1012 if (_rw_base != NULL) mapinfo->unmap_region(rw);
1013 if (_md_base != NULL) mapinfo->unmap_region(md);
1014 if (_mc_base != NULL) mapinfo->unmap_region(mc);
1015 #ifndef _WINDOWS
1016 // Release the entire mapped region
1017 shared_rs.release();
1018 #endif
1019 // If -Xshare:on is specified, print out the error message and exit VM,
1020 // otherwise, set UseSharedSpaces to false and continue.
1021 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1022 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1023 } else {
1024 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1025 }
1026 return false;
1027 }
1028 }
1029
1030 // Read the miscellaneous data from the shared file, and
1031 // serialize it out to its various destinations.
1032
1033 void MetaspaceShared::initialize_shared_spaces() {
1034 FileMapInfo *mapinfo = FileMapInfo::current_info();
1035
1036 char* buffer = mapinfo->header()->region_addr(md);
1037
1038 // Skip over (reserve space for) a list of addresses of C++ vtables
1039 // for Klass objects. They get filled in later.
1040
1041 void** vtbl_list = (void**)buffer;
1042 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*);
1043 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
1044
1045 // Skip over (reserve space for) dummy C++ vtables Klass objects.
1046 // They are used as is.
1047
1048 intptr_t vtable_size = *(intptr_t*)buffer;
1049 buffer += sizeof(intptr_t);
1050 buffer += vtable_size;
1051
1052 // Create the shared symbol table using the compact table at this spot in the
1053 // misc data space. (Todo: move this to read-only space. Currently
1054 // this is mapped copy-on-write but will never be written into).
1055
1056 buffer = (char*)SymbolTable::init_shared_table(buffer);
1057 SymbolTable::create_table();
1058
1059 // Create the shared string table using the compact table
1060 buffer = (char*)StringTable::init_shared_table(mapinfo, buffer);
1061
1062 // Create the shared dictionary using the bucket array at this spot in
1063 // the misc data space. Since the shared dictionary table is never
1064 // modified, this region (of mapped pages) will be (effectively, if
1065 // not explicitly) read-only.
1066
1067 int sharedDictionaryLen = *(intptr_t*)buffer;
1068 buffer += sizeof(intptr_t);
1069 int number_of_entries = *(intptr_t*)buffer;
1070 buffer += sizeof(intptr_t);
1071 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1072 sharedDictionaryLen,
1073 number_of_entries);
1074 buffer += sharedDictionaryLen;
1075
1076 // Create the package info table using the bucket array at this spot in
1077 // the misc data space. Since the package info table is never
1078 // modified, this region (of mapped pages) will be (effectively, if
1079 // not explicitly) read-only.
1080
1081 int pkgInfoLen = *(intptr_t*)buffer;
1082 buffer += sizeof(intptr_t);
1083 number_of_entries = *(intptr_t*)buffer;
1084 buffer += sizeof(intptr_t);
1085 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen,
1086 number_of_entries);
1087 buffer += pkgInfoLen;
1088 ClassLoader::verify();
1089
1090 // The following data in the shared misc data region are the linked
1091 // list elements (HashtableEntry objects) for the shared dictionary
1092 // and package info table.
1093
1094 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
1095 buffer += sizeof(intptr_t);
1096 buffer += len;
1097
1098 len = *(intptr_t*)buffer; // skip over package info table entries
1099 buffer += sizeof(intptr_t);
1100 buffer += len;
1101
1102 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
1103 buffer += sizeof(intptr_t);
1104 buffer += len;
1105
1106 intptr_t* array = (intptr_t*)buffer;
1107 ReadClosure rc(&array);
1108 serialize(&rc);
1109
1110 // Close the mapinfo file
1111 mapinfo->close();
1112
1113 if (PrintSharedArchiveAndExit) {
1114 if (PrintSharedDictionary) {
1115 tty->print_cr("\nShared classes:\n");
1116 SystemDictionary::print_shared(false);
1117 }
1118 if (_archive_loading_failed) {
1119 tty->print_cr("archive is invalid");
1120 vm_exit(1);
1121 } else {
1122 tty->print_cr("archive is valid");
1123 vm_exit(0);
1124 }
1125 }
1126 }
1127
1128 void MetaspaceShared::fixup_shared_string_regions() {
1129 FileMapInfo *mapinfo = FileMapInfo::current_info();
1130 mapinfo->fixup_string_regions();
1131 }
1132
1133 // JVM/TI RedefineClasses() support:
1134 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1135 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1136
1137 if (UseSharedSpaces) {
1138 // remap the shared readonly space to shared readwrite, private
1139 FileMapInfo* mapinfo = FileMapInfo::current_info();
1140 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1141 return false;
1142 }
1143 }
1144 return true;
1145 }
1146
1147 int MetaspaceShared::count_class(const char* classlist_file) {
1148 if (classlist_file == NULL) {
1149 return 0;
1150 }
1151 char class_name[256];
1152 int class_count = 0;
1153 FILE* file = fopen(classlist_file, "r");
1154 if (file != NULL) {
1155 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
1156 if (*class_name == '#') { // comment
1157 continue;
1158 }
1159 class_count++;
1160 }
1161 fclose(file);
1162 } else {
1163 char errmsg[JVM_MAXPATHLEN];
1164 os::lasterror(errmsg, JVM_MAXPATHLEN);
1165 tty->print_cr("Loading classlist failed: %s", errmsg);
1166 exit(1);
1167 }
1168
1169 return class_count;
1170 }
1171
1172 // the sizes are good for typical large applications that have a lot of shared
1173 // classes
1174 void MetaspaceShared::estimate_regions_size() {
1175 int class_count = count_class(SharedClassListFile);
1176 class_count += count_class(ExtraSharedClassListFile);
1177
1178 if (class_count > LargeThresholdClassCount) {
1179 if (class_count < HugeThresholdClassCount) {
1180 SET_ESTIMATED_SIZE(Large, ReadOnly);
1181 SET_ESTIMATED_SIZE(Large, ReadWrite);
1182 SET_ESTIMATED_SIZE(Large, MiscData);
1183 SET_ESTIMATED_SIZE(Large, MiscCode);
1184 } else {
1185 SET_ESTIMATED_SIZE(Huge, ReadOnly);
1186 SET_ESTIMATED_SIZE(Huge, ReadWrite);
1187 SET_ESTIMATED_SIZE(Huge, MiscData);
1188 SET_ESTIMATED_SIZE(Huge, MiscCode);
1189 }
1190 }
1191 }