1 /*
2 * Copyright (c) 2012, 2016, 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/classListParser.hpp"
27 #include "classfile/classLoaderExt.hpp"
28 #include "classfile/dictionary.hpp"
29 #include "classfile/loaderConstraints.hpp"
30 #include "classfile/placeholders.hpp"
31 #include "classfile/sharedClassUtil.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/systemDictionaryShared.hpp"
35 #include "code/codeCache.hpp"
36 #include "gc/shared/gcLocker.hpp"
37 #include "interpreter/bytecodeStream.hpp"
38 #include "interpreter/bytecodes.hpp"
39 #include "memory/filemap.hpp"
40 #include "memory/metaspace.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/objArrayOop.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "runtime/timerTrace.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/signature.hpp"
48 #include "runtime/vmThread.hpp"
49 #include "runtime/vm_operations.hpp"
50 #include "utilities/defaultStream.hpp"
51 #include "utilities/hashtable.inline.hpp"
52
53 int MetaspaceShared::_max_alignment = 0;
54
55 ReservedSpace* MetaspaceShared::_shared_rs = NULL;
56
57 MetaspaceSharedStats MetaspaceShared::_stats;
58
59 bool MetaspaceShared::_link_classes_made_progress;
60 bool MetaspaceShared::_check_classes_made_progress;
61 bool MetaspaceShared::_has_error_classes;
62 bool MetaspaceShared::_archive_loading_failed = false;
63 bool MetaspaceShared::_remapped_readwrite = false;
64 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
65 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
66 SharedMiscRegion MetaspaceShared::_mc;
67 SharedMiscRegion MetaspaceShared::_md;
68
69 void SharedMiscRegion::initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type) {
70 _vs.initialize(rs, committed_byte_size);
71 _alloc_top = _vs.low();
72 _space_type = space_type;
73 }
74
75 // NOT thread-safe, but this is called during dump time in single-threaded mode.
76 char* SharedMiscRegion::alloc(size_t num_bytes) {
77 assert(DumpSharedSpaces, "dump time only");
78 size_t alignment = sizeof(char*);
79 num_bytes = align_size_up(num_bytes, alignment);
80 _alloc_top = (char*)align_ptr_up(_alloc_top, alignment);
81 if (_alloc_top + num_bytes > _vs.high()) {
82 report_out_of_shared_space(_space_type);
83 }
84
85 char* p = _alloc_top;
86 _alloc_top += num_bytes;
87
88 memset(p, 0, num_bytes);
89 return p;
90 }
91
92 void MetaspaceShared::initialize_shared_rs(ReservedSpace* rs) {
93 assert(DumpSharedSpaces, "dump time only");
94 _shared_rs = rs;
95
96 // Split up and initialize the misc code and data spaces
97 size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize;
98 ReservedSpace shared_ro_rw = _shared_rs->first_part(metadata_size);
99 ReservedSpace misc_section = _shared_rs->last_part(metadata_size);
100
101 // Now split into misc sections.
102 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize);
103 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize);
104 _md.initialize(md_rs, SharedMiscDataSize, SharedMiscData);
105 _mc.initialize(mc_rs, SharedMiscCodeSize, SharedMiscData);
106 }
107
108 // Read/write a data stream for restoring/preserving metadata pointers and
109 // miscellaneous data from/to the shared archive file.
110
111 void MetaspaceShared::serialize(SerializeClosure* soc, GrowableArray<MemRegion> *string_space,
112 size_t* space_size) {
113 int tag = 0;
114 soc->do_tag(--tag);
115
116 // Verify the sizes of various metadata in the system.
117 soc->do_tag(sizeof(Method));
118 soc->do_tag(sizeof(ConstMethod));
119 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
120 soc->do_tag(sizeof(ConstantPool));
121 soc->do_tag(sizeof(ConstantPoolCache));
122 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
123 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
124 soc->do_tag(sizeof(Symbol));
125
126 // Dump/restore miscellaneous metadata.
127 Universe::serialize(soc, true);
128 soc->do_tag(--tag);
129
130 // Dump/restore references to commonly used names and signatures.
131 vmSymbols::serialize(soc);
132 soc->do_tag(--tag);
133
134 // Dump/restore the symbol and string tables
135 SymbolTable::serialize(soc);
136 StringTable::serialize(soc, string_space, space_size);
137 soc->do_tag(--tag);
138
139 // Dump/restore the misc information for system dictionary
140 SystemDictionaryShared::serialize(soc);
141 soc->do_tag(--tag);
142
143 soc->do_tag(666);
144 }
145
146 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
147 if (DumpSharedSpaces) {
148 if (_cds_i2i_entry_code_buffers == NULL) {
149 _cds_i2i_entry_code_buffers = (address)misc_data_space_alloc(total_size);
150 _cds_i2i_entry_code_buffers_size = total_size;
151 }
152 } else if (UseSharedSpaces) {
153 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
154 } else {
155 return NULL;
156 }
157
158 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
159 return _cds_i2i_entry_code_buffers;
160 }
161
162 // CDS code for dumping shared archive.
163
164 // Global object for holding classes that have been loaded. Since this
165 // is run at a safepoint just before exit, this is the entire set of classes.
166 static GrowableArray<Klass*>* _global_klass_objects;
167 static void collect_classes(Klass* k) {
168 _global_klass_objects->append_if_missing(k);
169 if (k->is_instance_klass()) {
170 // Add in the array classes too
171 InstanceKlass* ik = InstanceKlass::cast(k);
172 ik->array_klasses_do(collect_classes);
173 }
174 }
175
176 static void collect_classes2(Klass* k, ClassLoaderData* class_data) {
177 collect_classes(k);
178 }
179
180 static void remove_unshareable_in_classes() {
181 for (int i = 0; i < _global_klass_objects->length(); i++) {
182 Klass* k = _global_klass_objects->at(i);
183 k->remove_unshareable_info();
184 }
185 }
186
187 static void rewrite_nofast_bytecode(Method* method) {
188 RawBytecodeStream bcs(method);
189 while (!bcs.is_last_bytecode()) {
190 Bytecodes::Code opcode = bcs.raw_next();
191 switch (opcode) {
192 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
193 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
194 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
195 case Bytecodes::_iload: {
196 if (!bcs.is_wide()) {
197 *bcs.bcp() = Bytecodes::_nofast_iload;
198 }
199 break;
200 }
201 default: break;
202 }
203 }
204 }
205
206 // Walk all methods in the class list to ensure that they won't be modified at
207 // run time. This includes:
208 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
209 // at run time by RewriteBytecodes/RewriteFrequentPairs
210 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
211 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
212 for (int i = 0; i < _global_klass_objects->length(); i++) {
213 Klass* k = _global_klass_objects->at(i);
214 if (k->is_instance_klass()) {
215 InstanceKlass* ik = InstanceKlass::cast(k);
216 for (int i = 0; i < ik->methods()->length(); i++) {
217 Method* m = ik->methods()->at(i);
218 rewrite_nofast_bytecode(m);
219 Fingerprinter fp(m);
220 // The side effect of this call sets method's fingerprint field.
221 fp.fingerprint();
222 }
223 }
224 }
225 }
226
227 // Patch C++ vtable pointer in metadata.
228
229 // Klass and other metadata objects contain references to c++ vtables in the
230 // JVM library.
231 // Fix them to point to our constructed vtables. However, don't iterate
232 // across the space while doing this, as that causes the vtables to be
233 // patched, undoing our useful work. Instead, iterate to make a list,
234 // then use the list to do the fixing.
235 //
236 // Our constructed vtables:
237 // Dump time:
238 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs
239 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list
240 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and
241 // associated metadata to point to jump table rather than to current vtbl
242 // Table layout: NOTE FIXED SIZE
243 // 1. vtbl pointers
244 // 2. #Klass X #virtual methods per Klass
245 // 1 entry for each, in the order:
246 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry
247 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry
248 // ...
249 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry,
250 // ... Klass<vtbl_list_size>:method<num_virtuals> entry
251 // Sample entry: (Sparc):
252 // save(sp, -256, sp)
253 // ba,pt common_code
254 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255)
255 //
256 // Restore time:
257 // 1. initialize_shared_space: reserve space for table
258 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text
259 //
260 // Execution time:
261 // First virtual method call for any object of these metadata types:
262 // 1. object->klass
263 // 2. vtable entry for that klass points to the jump table entries
264 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index
265 // 4. common_code:
266 // Get address of new vtbl pointer for this Klass from updated table
267 // Update new vtbl pointer in the Klass: future virtual calls go direct
268 // Jump to method, using new vtbl pointer and method index
269
270
271 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) {
272 void* old_vtbl_ptr = *(void**)obj;
273 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) {
274 if (vtbl_list[i] == old_vtbl_ptr) {
275 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals;
276 }
277 }
278 ShouldNotReachHere();
279 return NULL;
280 }
281
282 // Assumes the vtable is in first slot in object.
283 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) {
284 int n = _global_klass_objects->length();
285 for (int i = 0; i < n; i++) {
286 Klass* obj = _global_klass_objects->at(i);
287 // Note is_instance_klass() is a virtual call in debug. After patching vtables
288 // all virtual calls on the dummy vtables will restore the original!
289 if (obj->is_instance_klass()) {
290 InstanceKlass* ik = InstanceKlass::cast(obj);
291 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik);
292 ConstantPool* cp = ik->constants();
293 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp);
294 for (int j = 0; j < ik->methods()->length(); j++) {
295 Method* m = ik->methods()->at(j);
296 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m);
297 }
298 } else {
299 // Array klasses
300 Klass* k = obj;
301 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k);
302 }
303 }
304 }
305
306 // Closure for serializing initialization data out to a data area to be
307 // written to the shared file.
308
309 class WriteClosure : public SerializeClosure {
310 private:
311 intptr_t* top;
312 char* end;
313
314 inline void check_space() {
315 if ((char*)top + sizeof(intptr_t) > end) {
316 report_out_of_shared_space(SharedMiscData);
317 }
318 }
319
320 public:
321 WriteClosure(char* md_top, char* md_end) {
322 top = (intptr_t*)md_top;
323 end = md_end;
324 }
325
326 char* get_top() { return (char*)top; }
327
328 void do_ptr(void** p) {
329 check_space();
330 *top = (intptr_t)*p;
331 ++top;
332 }
333
334 void do_u4(u4* p) {
335 void* ptr = (void*)(uintx(*p));
336 do_ptr(&ptr);
337 }
338
339 void do_tag(int tag) {
340 check_space();
341 *top = (intptr_t)tag;
342 ++top;
343 }
344
345 void do_region(u_char* start, size_t size) {
346 if ((char*)top + size > end) {
347 report_out_of_shared_space(SharedMiscData);
348 }
349 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
350 assert(size % sizeof(intptr_t) == 0, "bad size");
351 do_tag((int)size);
352 while (size > 0) {
353 *top = *(intptr_t*)start;
354 ++top;
355 start += sizeof(intptr_t);
356 size -= sizeof(intptr_t);
357 }
358 }
359
360 bool reading() const { return false; }
361 };
362
363 // This is for dumping detailed statistics for the allocations
364 // in the shared spaces.
365 class DumpAllocClosure : public Metaspace::AllocRecordClosure {
366 public:
367
368 // Here's poor man's enum inheritance
369 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
370 METASPACE_OBJ_TYPES_DO(f) \
371 f(SymbolHashentry) \
372 f(SymbolBucket) \
373 f(StringHashentry) \
374 f(StringBucket) \
375 f(Other)
376
377 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type,
378 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
379
380 enum Type {
381 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
382 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE)
383 _number_of_types
384 };
385
386 static const char * type_name(Type type) {
387 switch(type) {
388 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE)
389 default:
390 ShouldNotReachHere();
391 return NULL;
392 }
393 }
394
395 public:
396 enum {
397 RO = 0,
398 RW = 1
399 };
400
401 int _counts[2][_number_of_types];
402 int _bytes [2][_number_of_types];
403 int _which;
404
405 DumpAllocClosure() {
406 memset(_counts, 0, sizeof(_counts));
407 memset(_bytes, 0, sizeof(_bytes));
408 };
409
410 void iterate_metaspace(Metaspace* space, int which) {
411 assert(which == RO || which == RW, "sanity");
412 _which = which;
413 space->iterate(this);
414 }
415
416 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) {
417 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
418 _counts[_which][type] ++;
419 _bytes [_which][type] += byte_size;
420 }
421
422 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all);
423 };
424
425 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) {
426 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write
427 int other_bytes = md_all + mc_all;
428
429 // Calculate size of data that was not allocated by Metaspace::allocate()
430 MetaspaceSharedStats *stats = MetaspaceShared::stats();
431
432 // symbols
433 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
434 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
435 _bytes [RO][TypeArrayU4Type] -= stats->symbol.hashentry_bytes;
436
437 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
438 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
439 _bytes [RO][TypeArrayU4Type] -= stats->symbol.bucket_bytes;
440
441 // strings
442 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
443 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
444 _bytes [RO][TypeArrayU4Type] -= stats->string.hashentry_bytes;
445
446 _counts[RO][StringBucketType] = stats->string.bucket_count;
447 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
448 _bytes [RO][TypeArrayU4Type] -= stats->string.bucket_bytes;
449
450 // TODO: count things like dictionary, vtable, etc
451 _bytes[RW][OtherType] = other_bytes;
452
453 // prevent divide-by-zero
454 if (ro_all < 1) {
455 ro_all = 1;
456 }
457 if (rw_all < 1) {
458 rw_all = 1;
459 }
460
461 int all_ro_count = 0;
462 int all_ro_bytes = 0;
463 int all_rw_count = 0;
464 int all_rw_bytes = 0;
465
466 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
467 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
468 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
469 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
470
471 tty->print_cr("Detailed metadata info (rw includes md and mc):");
472 tty->print_cr("%s", hdr);
473 tty->print_cr("%s", sep);
474 for (int type = 0; type < int(_number_of_types); type ++) {
475 const char *name = type_name((Type)type);
476 int ro_count = _counts[RO][type];
477 int ro_bytes = _bytes [RO][type];
478 int rw_count = _counts[RW][type];
479 int rw_bytes = _bytes [RW][type];
480 int count = ro_count + rw_count;
481 int bytes = ro_bytes + rw_bytes;
482
483 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
484 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
485 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
486
487 tty->print_cr(fmt_stats, name,
488 ro_count, ro_bytes, ro_perc,
489 rw_count, rw_bytes, rw_perc,
490 count, bytes, perc);
491
492 all_ro_count += ro_count;
493 all_ro_bytes += ro_bytes;
494 all_rw_count += rw_count;
495 all_rw_bytes += rw_bytes;
496 }
497
498 int all_count = all_ro_count + all_rw_count;
499 int all_bytes = all_ro_bytes + all_rw_bytes;
500
501 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
502 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
503 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
504
505 tty->print_cr("%s", sep);
506 tty->print_cr(fmt_stats, "Total",
507 all_ro_count, all_ro_bytes, all_ro_perc,
508 all_rw_count, all_rw_bytes, all_rw_perc,
509 all_count, all_bytes, all_perc);
510
511 assert(all_ro_bytes == ro_all, "everything should have been counted");
512 assert(all_rw_bytes == rw_all, "everything should have been counted");
513 #undef fmt_stats
514 }
515
516 // Populate the shared space.
517
518 class VM_PopulateDumpSharedSpace: public VM_Operation {
519 private:
520 ClassLoaderData* _loader_data;
521 GrowableArray<Klass*> *_class_promote_order;
522 VirtualSpace _md_vs;
523 VirtualSpace _mc_vs;
524 GrowableArray<MemRegion> *_string_regions;
525
526 public:
527 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data,
528 GrowableArray<Klass*> *class_promote_order) :
529 _loader_data(loader_data) {
530 _class_promote_order = class_promote_order;
531 }
532
533 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
534 void doit(); // outline because gdb sucks
535
536 private:
537 void handle_misc_data_space_failure(bool success) {
538 if (!success) {
539 report_out_of_shared_space(SharedMiscData);
540 }
541 }
542 }; // class VM_PopulateDumpSharedSpace
543
544 void VM_PopulateDumpSharedSpace::doit() {
545 Thread* THREAD = VMThread::vm_thread();
546 NOT_PRODUCT(SystemDictionary::verify();)
547 // The following guarantee is meant to ensure that no loader constraints
548 // exist yet, since the constraints table is not shared. This becomes
549 // more important now that we don't re-initialize vtables/itables for
550 // shared classes at runtime, where constraints were previously created.
551 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
552 "loader constraints are not saved");
553 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
554 "placeholders are not saved");
555 // Revisit and implement this if we prelink method handle call sites:
556 guarantee(SystemDictionary::invoke_method_table() == NULL ||
557 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
558 "invoke method table is not saved");
559
560 // At this point, many classes have been loaded.
561 // Gather systemDictionary classes in a global array and do everything to
562 // that so we don't have to walk the SystemDictionary again.
563 _global_klass_objects = new GrowableArray<Klass*>(1000);
564 Universe::basic_type_classes_do(collect_classes);
565
566 // Need to call SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*))
567 // as we may have some classes with NULL ClassLoaderData* in the dictionary. Other
568 // variants of SystemDictionary::classes_do will skip those classes.
569 SystemDictionary::classes_do(collect_classes2);
570
571 tty->print_cr("Number of classes %d", _global_klass_objects->length());
572 {
573 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
574 for (int i = 0; i < _global_klass_objects->length(); i++) {
575 Klass* k = _global_klass_objects->at(i);
576 if (k->is_instance_klass()) {
577 num_inst ++;
578 } else if (k->is_objArray_klass()) {
579 num_obj_array ++;
580 } else {
581 assert(k->is_typeArray_klass(), "sanity");
582 num_type_array ++;
583 }
584 }
585 tty->print_cr(" instance classes = %5d", num_inst);
586 tty->print_cr(" obj array classes = %5d", num_obj_array);
587 tty->print_cr(" type array classes = %5d", num_type_array);
588 }
589
590
591 // Ensure the ConstMethods won't be modified at run-time
592 tty->print("Updating ConstMethods ... ");
593 rewrite_nofast_bytecodes_and_calculate_fingerprints();
594 tty->print_cr("done. ");
595
596 // Remove all references outside the metadata
597 tty->print("Removing unshareable information ... ");
598 remove_unshareable_in_classes();
599 tty->print_cr("done. ");
600
601 // Set up the share data and shared code segments.
602 _md_vs = *MetaspaceShared::misc_data_region()->virtual_space();
603 _mc_vs = *MetaspaceShared::misc_code_region()->virtual_space();
604 char* md_low = _md_vs.low();
605 char* md_top = MetaspaceShared::misc_data_region()->alloc_top();
606 char* md_end = _md_vs.high();
607 char* mc_low = _mc_vs.low();
608 char* mc_top = MetaspaceShared::misc_code_region()->alloc_top();
609 char* mc_end = _mc_vs.high();
610
611 // Reserve space for the list of Klass*s whose vtables are used
612 // for patching others as needed.
613
614 void** vtbl_list = (void**)md_top;
615 int vtbl_list_size = MetaspaceShared::vtbl_list_size;
616 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
617
618 md_top += vtbl_list_size * sizeof(void*);
619 void* vtable = md_top;
620
621 // Reserve space for a new dummy vtable for klass objects in the
622 // heap. Generate self-patching vtable entries.
623
624 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable,
625 &md_top, md_end,
626 &mc_top, mc_end);
627
628 guarantee(md_top <= md_end, "Insufficient space for vtables.");
629
630 // Reorder the system dictionary. (Moving the symbols affects
631 // how the hash table indices are calculated.)
632 // Not doing this either.
633
634 SystemDictionary::reorder_dictionary();
635 NOT_PRODUCT(SystemDictionary::verify();)
636 SystemDictionary::reverse();
637 SystemDictionary::copy_buckets(&md_top, md_end);
638
639 SystemDictionary::copy_table(&md_top, md_end);
640
641 // Write the other data to the output array.
642 // SymbolTable, StringTable and extra information for system dictionary
643 NOT_PRODUCT(SymbolTable::verify());
644 NOT_PRODUCT(StringTable::verify());
645 size_t ss_bytes = 0;
646 char* ss_low;
647 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details.
648 _string_regions = new GrowableArray<MemRegion>(2);
649
650 WriteClosure wc(md_top, md_end);
651 MetaspaceShared::serialize(&wc, _string_regions, &ss_bytes);
652 md_top = wc.get_top();
653 ss_low = _string_regions->is_empty() ? NULL : (char*)_string_regions->first().start();
654
655 // Print shared spaces all the time
656 Metaspace* ro_space = _loader_data->ro_metaspace();
657 Metaspace* rw_space = _loader_data->rw_metaspace();
658
659 // Allocated size of each space (may not be all occupied)
660 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType);
661 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType);
662 const size_t md_alloced = md_end-md_low;
663 const size_t mc_alloced = mc_end-mc_low;
664 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced
665 + ss_bytes;
666
667 // Occupied size of each space.
668 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType);
669 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType);
670 const size_t md_bytes = size_t(md_top - md_low);
671 const size_t mc_bytes = size_t(mc_top - mc_low);
672
673 // Percent of total size
674 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes + ss_bytes;
675 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0;
676 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0;
677 const double md_t_perc = md_bytes / double(total_bytes) * 100.0;
678 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0;
679 const double ss_t_perc = ss_bytes / double(total_bytes) * 100.0;
680
681 // Percent of fullness of each space
682 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0;
683 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0;
684 const double md_u_perc = md_bytes / double(md_alloced) * 100.0;
685 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0;
686 const double total_u_perc = total_bytes / double(total_alloced) * 100.0;
687
688 #define fmt_space "%s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT
689 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, p2i(ro_space->bottom()));
690 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, p2i(rw_space->bottom()));
691 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, p2i(md_low));
692 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, p2i(mc_low));
693 tty->print_cr(fmt_space, "st", ss_bytes, ss_t_perc, ss_bytes, 100.0, p2i(ss_low));
694 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
695 total_bytes, total_alloced, total_u_perc);
696
697 // Update the vtable pointers in all of the Klass objects in the
698 // heap. They should point to newly generated vtable.
699 patch_klass_vtables(vtbl_list, vtable);
700
701 // dunno what this is for.
702 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass);
703 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
704 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
705
706 // Create and write the archive file that maps the shared spaces.
707
708 FileMapInfo* mapinfo = new FileMapInfo();
709 mapinfo->populate_header(MetaspaceShared::max_alignment());
710 mapinfo->set_misc_data_patching_start((char*)vtbl_list);
711 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
712 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
713
714 for (int pass=1; pass<=2; pass++) {
715 if (pass == 1) {
716 // The first pass doesn't actually write the data to disk. All it
717 // does is to update the fields in the mapinfo->_header.
718 } else {
719 // After the first pass, the contents of mapinfo->_header are finalized,
720 // so we can compute the header's CRC, and write the contents of the header
721 // and the regions into disk.
722 mapinfo->open_for_write();
723 mapinfo->set_header_crc(mapinfo->compute_header_crc());
724 }
725 mapinfo->write_header();
726 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
727 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
728 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
729 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
730 SharedMiscDataSize,
731 false, true);
732 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
733 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
734 SharedMiscCodeSize,
735 true, true);
736 mapinfo->write_string_regions(_string_regions);
737 }
738
739 mapinfo->close();
740
741 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
742 os::free(saved_vtbl);
743
744 if (PrintSharedSpaces) {
745 DumpAllocClosure dac;
746 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO);
747 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW);
748
749 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes));
750 }
751 #undef fmt_space
752 }
753
754
755 void MetaspaceShared::link_one_shared_class(Klass* k, TRAPS) {
756 if (k->is_instance_klass()) {
757 InstanceKlass* ik = InstanceKlass::cast(k);
758 // Link the class to cause the bytecodes to be rewritten and the
759 // cpcache to be created. Class verification is done according
760 // to -Xverify setting.
761 _link_classes_made_progress |= try_link_class(ik, THREAD);
762 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
763 }
764 }
765
766 void MetaspaceShared::check_one_shared_class(Klass* k) {
767 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
768 _check_classes_made_progress = true;
769 }
770 }
771
772 void MetaspaceShared::check_shared_class_loader_type(Klass* k) {
773 if (k->is_instance_klass()) {
774 InstanceKlass* ik = InstanceKlass::cast(k);
775 u2 loader_type = ik->loader_type();
776 ResourceMark rm;
777 guarantee(loader_type != 0,
778 "Class loader type is not set for this class %s", ik->name()->as_C_string());
779 }
780 }
781
782 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
783 // We need to iterate because verification may cause additional classes
784 // to be loaded.
785 do {
786 _link_classes_made_progress = false;
787 SystemDictionary::classes_do(link_one_shared_class, THREAD);
788 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
789 } while (_link_classes_made_progress);
790
791 if (_has_error_classes) {
792 // Mark all classes whose super class or interfaces failed verification.
793 do {
794 // Not completely sure if we need to do this iteratively. Anyway,
795 // we should come here only if there are unverifiable classes, which
796 // shouldn't happen in normal cases. So better safe than sorry.
797 _check_classes_made_progress = false;
798 SystemDictionary::classes_do(check_one_shared_class);
799 } while (_check_classes_made_progress);
800
801 if (IgnoreUnverifiableClassesDuringDump) {
802 // This is useful when running JCK or SQE tests. You should not
803 // enable this when running real apps.
804 SystemDictionary::remove_classes_in_error_state();
805 } else {
806 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
807 exit(1);
808 }
809 }
810
811 // Copy the verification constraints from C_HEAP-alloced GrowableArrays to RO-alloced
812 // Arrays
813 SystemDictionaryShared::finalize_verification_constraints();
814 }
815
816 void MetaspaceShared::prepare_for_dumping() {
817 Arguments::check_unsupported_dumping_properties();
818 ClassLoader::initialize_shared_path();
819 FileMapInfo::allocate_classpath_entry_table();
820 }
821
822 // Preload classes from a list, populate the shared spaces and dump to a
823 // file.
824 void MetaspaceShared::preload_and_dump(TRAPS) {
825 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
826 ResourceMark rm;
827 char class_list_path_str[JVM_MAXPATHLEN];
828
829 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
830 MetaspaceShared::shared_rs()->size(),
831 p2i(MetaspaceShared::shared_rs()->base()));
832
833 // Preload classes to be shared.
834 // Should use some os:: method rather than fopen() here. aB.
835 const char* class_list_path;
836 if (SharedClassListFile == NULL) {
837 // Construct the path to the class list (in jre/lib)
838 // Walk up two directories from the location of the VM and
839 // optionally tack on "lib" (depending on platform)
840 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
841 for (int i = 0; i < 3; i++) {
842 char *end = strrchr(class_list_path_str, *os::file_separator());
843 if (end != NULL) *end = '\0';
844 }
845 int class_list_path_len = (int)strlen(class_list_path_str);
846 if (class_list_path_len >= 3) {
847 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
848 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
849 jio_snprintf(class_list_path_str + class_list_path_len,
850 sizeof(class_list_path_str) - class_list_path_len,
851 "%slib", os::file_separator());
852 class_list_path_len += 4;
853 }
854 }
855 }
856 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
857 jio_snprintf(class_list_path_str + class_list_path_len,
858 sizeof(class_list_path_str) - class_list_path_len,
859 "%sclasslist", os::file_separator());
860 }
861 class_list_path = class_list_path_str;
862 } else {
863 class_list_path = SharedClassListFile;
864 }
865
866 int class_count = 0;
867 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
868
869 // sun.io.Converters
870 static const char obj_array_sig[] = "[[Ljava/lang/Object;";
871 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
872
873 // java.util.HashMap
874 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
875 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
876
877 // Need to allocate the op here:
878 // op.misc_data_space_alloc() will be called during preload_and_dump().
879 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
880 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
881
882 tty->print_cr("Loading classes to share ...");
883 _has_error_classes = false;
884 class_count += preload_and_dump(class_list_path, class_promote_order,
885 THREAD);
886 if (ExtraSharedClassListFile) {
887 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
888 THREAD);
889 }
890 tty->print_cr("Loading classes to share: done.");
891
892 if (PrintSharedSpaces) {
893 tty->print_cr("Shared spaces: preloaded %d classes", class_count);
894 }
895
896 // Rewrite and link classes
897 tty->print_cr("Rewriting and linking classes ...");
898
899 // Link any classes which got missed. This would happen if we have loaded classes that
900 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
901 // fails verification, all other interfaces that were not specified in the classlist but
902 // are implemented by K are not verified.
903 link_and_cleanup_shared_classes(CATCH);
904 tty->print_cr("Rewriting and linking classes: done");
905
906 VMThread::execute(&op);
907 }
908 // Since various initialization steps have been undone by this process,
909 // it is not reasonable to continue running a java process.
910 exit(0);
911 }
912
913
914 int MetaspaceShared::preload_and_dump(const char* class_list_path,
915 GrowableArray<Klass*>* class_promote_order,
916 TRAPS) {
917 ClassListParser parser(class_list_path);
918 int class_count = 0;
919
920 while (parser.parse_one_line()) {
921 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
922
923 CLEAR_PENDING_EXCEPTION;
924 if (klass != NULL) {
925 if (PrintSharedSpaces && Verbose && WizardMode) {
926 ResourceMark rm;
927 tty->print_cr("Shared spaces preloaded: %s", klass->external_name());
928 }
929
930 InstanceKlass* ik = InstanceKlass::cast(klass);
931
932 // Should be class load order as per -Xlog:class+preorder
933 class_promote_order->append(ik);
934
935 // Link the class to cause the bytecodes to be rewritten and the
936 // cpcache to be created. The linking is done as soon as classes
937 // are loaded in order that the related data structures (klass and
938 // cpCache) are located together.
939 try_link_class(ik, THREAD);
940 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
941
942 class_count++;
943 }
944 }
945
946 return class_count;
947 }
948
949 // Returns true if the class's status has changed
950 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
951 assert(DumpSharedSpaces, "should only be called during dumping");
952 if (ik->init_state() < InstanceKlass::linked) {
953 bool saved = BytecodeVerificationLocal;
954 if (!(ik->is_shared_boot_class())) {
955 // The verification decision is based on BytecodeVerificationRemote
956 // for non-system classes. Since we are using the NULL classloader
957 // to load non-system classes during dumping, we need to temporarily
958 // change BytecodeVerificationLocal to be the same as
959 // BytecodeVerificationRemote. Note this can cause the parent system
960 // classes also being verified. The extra overhead is acceptable during
961 // dumping.
962 BytecodeVerificationLocal = BytecodeVerificationRemote;
963 }
964 ik->link_class(THREAD);
965 if (HAS_PENDING_EXCEPTION) {
966 ResourceMark rm;
967 tty->print_cr("Preload Warning: Verification failed for %s",
968 ik->external_name());
969 CLEAR_PENDING_EXCEPTION;
970 ik->set_in_error_state();
971 _has_error_classes = true;
972 }
973 BytecodeVerificationLocal = saved;
974 return true;
975 } else {
976 return false;
977 }
978 }
979
980 // Closure for serializing initialization data in from a data area
981 // (ptr_array) read from the shared file.
982
983 class ReadClosure : public SerializeClosure {
984 private:
985 intptr_t** _ptr_array;
986
987 inline intptr_t nextPtr() {
988 return *(*_ptr_array)++;
989 }
990
991 public:
992 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
993
994 void do_ptr(void** p) {
995 assert(*p == NULL, "initializing previous initialized pointer.");
996 intptr_t obj = nextPtr();
997 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
998 "hit tag while initializing ptrs.");
999 *p = (void*)obj;
1000 }
1001
1002 void do_u4(u4* p) {
1003 intptr_t obj = nextPtr();
1004 *p = (u4)(uintx(obj));
1005 }
1006
1007 void do_tag(int tag) {
1008 int old_tag;
1009 old_tag = (int)(intptr_t)nextPtr();
1010 // do_int(&old_tag);
1011 assert(tag == old_tag, "old tag doesn't match");
1012 FileMapInfo::assert_mark(tag == old_tag);
1013 }
1014
1015 void do_region(u_char* start, size_t size) {
1016 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1017 assert(size % sizeof(intptr_t) == 0, "bad size");
1018 do_tag((int)size);
1019 while (size > 0) {
1020 *(intptr_t*)start = nextPtr();
1021 start += sizeof(intptr_t);
1022 size -= sizeof(intptr_t);
1023 }
1024 }
1025
1026 bool reading() const { return true; }
1027 };
1028
1029 // Return true if given address is in the mapped shared space.
1030 bool MetaspaceShared::is_in_shared_space(const void* p) {
1031 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
1032 }
1033
1034 // Return true if given address is in the misc data region
1035 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
1036 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
1037 }
1038
1039 bool MetaspaceShared::is_string_region(int idx) {
1040 return (idx >= MetaspaceShared::first_string &&
1041 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings);
1042 }
1043
1044 void MetaspaceShared::print_shared_spaces() {
1045 if (UseSharedSpaces) {
1046 FileMapInfo::current_info()->print_shared_spaces();
1047 }
1048 }
1049
1050
1051 // Map shared spaces at requested addresses and return if succeeded.
1052 // Need to keep the bounds of the ro and rw space for the Metaspace::contains
1053 // call, or is_in_shared_space.
1054 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1055 size_t image_alignment = mapinfo->alignment();
1056
1057 #ifndef _WINDOWS
1058 // Map in the shared memory and then map the regions on top of it.
1059 // On Windows, don't map the memory here because it will cause the
1060 // mappings of the regions to fail.
1061 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
1062 if (!shared_rs.is_reserved()) return false;
1063 #endif
1064
1065 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
1066
1067 char* _ro_base = NULL;
1068 char* _rw_base = NULL;
1069 char* _md_base = NULL;
1070 char* _mc_base = NULL;
1071
1072 // Map each shared region
1073 if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
1074 mapinfo->verify_region_checksum(ro) &&
1075 (_rw_base = mapinfo->map_region(rw)) != NULL &&
1076 mapinfo->verify_region_checksum(rw) &&
1077 (_md_base = mapinfo->map_region(md)) != NULL &&
1078 mapinfo->verify_region_checksum(md) &&
1079 (_mc_base = mapinfo->map_region(mc)) != NULL &&
1080 mapinfo->verify_region_checksum(mc) &&
1081 (image_alignment == (size_t)max_alignment()) &&
1082 mapinfo->validate_classpath_entry_table()) {
1083 // Success (no need to do anything)
1084 return true;
1085 } else {
1086 // If there was a failure in mapping any of the spaces, unmap the ones
1087 // that succeeded
1088 if (_ro_base != NULL) mapinfo->unmap_region(ro);
1089 if (_rw_base != NULL) mapinfo->unmap_region(rw);
1090 if (_md_base != NULL) mapinfo->unmap_region(md);
1091 if (_mc_base != NULL) mapinfo->unmap_region(mc);
1092 #ifndef _WINDOWS
1093 // Release the entire mapped region
1094 shared_rs.release();
1095 #endif
1096 // If -Xshare:on is specified, print out the error message and exit VM,
1097 // otherwise, set UseSharedSpaces to false and continue.
1098 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1099 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1100 } else {
1101 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1102 }
1103 return false;
1104 }
1105 }
1106
1107 // Read the miscellaneous data from the shared file, and
1108 // serialize it out to its various destinations.
1109
1110 void MetaspaceShared::initialize_shared_spaces() {
1111 FileMapInfo *mapinfo = FileMapInfo::current_info();
1112 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
1113 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
1114 char* buffer = mapinfo->misc_data_patching_start();
1115
1116 // Skip over (reserve space for) a list of addresses of C++ vtables
1117 // for Klass objects. They get filled in later.
1118
1119 void** vtbl_list = (void**)buffer;
1120 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*);
1121 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
1122
1123 // Skip over (reserve space for) dummy C++ vtables Klass objects.
1124 // They are used as is.
1125
1126 intptr_t vtable_size = *(intptr_t*)buffer;
1127 buffer += sizeof(intptr_t);
1128 buffer += vtable_size;
1129
1130 int sharedDictionaryLen = *(intptr_t*)buffer;
1131 buffer += sizeof(intptr_t);
1132 int number_of_entries = *(intptr_t*)buffer;
1133 buffer += sizeof(intptr_t);
1134 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1135 sharedDictionaryLen,
1136 number_of_entries);
1137 buffer += sharedDictionaryLen;
1138
1139 // The following data in the shared misc data region are the linked
1140 // list elements (HashtableEntry objects) for the shared dictionary
1141 // table.
1142
1143 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
1144 buffer += sizeof(intptr_t);
1145 buffer += len;
1146
1147 // Verify various attributes of the archive, plus initialize the
1148 // shared string/symbol tables
1149 intptr_t* array = (intptr_t*)buffer;
1150 ReadClosure rc(&array);
1151 serialize(&rc, NULL, NULL);
1152
1153 // Initialize the run-time symbol table.
1154 SymbolTable::create_table();
1155
1156 // Close the mapinfo file
1157 mapinfo->close();
1158
1159 if (PrintSharedArchiveAndExit) {
1160 if (PrintSharedDictionary) {
1161 tty->print_cr("\nShared classes:\n");
1162 SystemDictionary::print_shared(false);
1163 }
1164 if (_archive_loading_failed) {
1165 tty->print_cr("archive is invalid");
1166 vm_exit(1);
1167 } else {
1168 tty->print_cr("archive is valid");
1169 vm_exit(0);
1170 }
1171 }
1172 }
1173
1174 void MetaspaceShared::fixup_shared_string_regions() {
1175 FileMapInfo *mapinfo = FileMapInfo::current_info();
1176 mapinfo->fixup_string_regions();
1177 }
1178
1179 // JVM/TI RedefineClasses() support:
1180 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1181 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1182
1183 if (UseSharedSpaces) {
1184 // remap the shared readonly space to shared readwrite, private
1185 FileMapInfo* mapinfo = FileMapInfo::current_info();
1186 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1187 return false;
1188 }
1189 _remapped_readwrite = true;
1190 }
1191 return true;
1192 }
1193
1194 int MetaspaceShared::count_class(const char* classlist_file) {
1195 if (classlist_file == NULL) {
1196 return 0;
1197 }
1198 char class_name[256];
1199 int class_count = 0;
1200 FILE* file = fopen(classlist_file, "r");
1201 if (file != NULL) {
1202 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
1203 if (*class_name == '#') { // comment
1204 continue;
1205 }
1206 class_count++;
1207 }
1208 fclose(file);
1209 } else {
1210 char errmsg[JVM_MAXPATHLEN];
1211 os::lasterror(errmsg, JVM_MAXPATHLEN);
1212 tty->print_cr("Loading classlist failed: %s", errmsg);
1213 exit(1);
1214 }
1215
1216 return class_count;
1217 }
1218
1219 // the sizes are good for typical large applications that have a lot of shared
1220 // classes
1221 void MetaspaceShared::estimate_regions_size() {
1222 int class_count = count_class(SharedClassListFile);
1223 class_count += count_class(ExtraSharedClassListFile);
1224
1225 if (class_count > LargeThresholdClassCount) {
1226 if (class_count < HugeThresholdClassCount) {
1227 SET_ESTIMATED_SIZE(Large, ReadOnly);
1228 SET_ESTIMATED_SIZE(Large, ReadWrite);
1229 SET_ESTIMATED_SIZE(Large, MiscData);
1230 SET_ESTIMATED_SIZE(Large, MiscCode);
1231 } else {
1232 SET_ESTIMATED_SIZE(Huge, ReadOnly);
1233 SET_ESTIMATED_SIZE(Huge, ReadWrite);
1234 SET_ESTIMATED_SIZE(Huge, MiscData);
1235 SET_ESTIMATED_SIZE(Huge, MiscCode);
1236 }
1237 }
1238 }