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 SharedMiscRegion MetaspaceShared::_od;
69
70 void SharedMiscRegion::initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type) {
71 _vs.initialize(rs, committed_byte_size);
72 _alloc_top = _vs.low();
73 _space_type = space_type;
74 }
75
76 // NOT thread-safe, but this is called during dump time in single-threaded mode.
77 char* SharedMiscRegion::alloc(size_t num_bytes) {
78 assert(DumpSharedSpaces, "dump time only");
79 size_t alignment = sizeof(char*);
80 num_bytes = align_size_up(num_bytes, alignment);
81 _alloc_top = (char*)align_ptr_up(_alloc_top, alignment);
82 if (_alloc_top + num_bytes > _vs.high()) {
83 report_out_of_shared_space(_space_type);
84 }
85
86 char* p = _alloc_top;
87 _alloc_top += num_bytes;
88
89 memset(p, 0, num_bytes);
90 return p;
91 }
92
93 void MetaspaceShared::initialize_shared_rs(ReservedSpace* rs) {
94 assert(DumpSharedSpaces, "dump time only");
95 _shared_rs = rs;
96
97 size_t core_spaces_size = FileMapInfo::core_spaces_size();
98 size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize;
99
100 // Split into the core and optional sections
101 ReservedSpace core_data = _shared_rs->first_part(core_spaces_size);
102 ReservedSpace optional_data = _shared_rs->last_part(core_spaces_size);
103
104 // The RO/RW and the misc sections
105 ReservedSpace shared_ro_rw = core_data.first_part(metadata_size);
106 ReservedSpace misc_section = core_data.last_part(metadata_size);
107
108 // Now split the misc code and misc data sections.
109 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize);
110 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize);
111
112 _md.initialize(md_rs, SharedMiscDataSize, SharedMiscData);
113 _mc.initialize(mc_rs, SharedMiscCodeSize, SharedMiscCode);
114 _od.initialize(optional_data, metadata_size, SharedOptional);
115 }
116
117 // Read/write a data stream for restoring/preserving metadata pointers and
118 // miscellaneous data from/to the shared archive file.
119
120 void MetaspaceShared::serialize(SerializeClosure* soc, GrowableArray<MemRegion> *string_space,
121 size_t* space_size) {
122 int tag = 0;
123 soc->do_tag(--tag);
124
125 // Verify the sizes of various metadata in the system.
126 soc->do_tag(sizeof(Method));
127 soc->do_tag(sizeof(ConstMethod));
128 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
129 soc->do_tag(sizeof(ConstantPool));
130 soc->do_tag(sizeof(ConstantPoolCache));
131 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
132 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
133 soc->do_tag(sizeof(Symbol));
134
135 // Dump/restore miscellaneous metadata.
136 Universe::serialize(soc, true);
137 soc->do_tag(--tag);
138
139 // Dump/restore references to commonly used names and signatures.
140 vmSymbols::serialize(soc);
141 soc->do_tag(--tag);
142
143 // Dump/restore the symbol and string tables
144 SymbolTable::serialize(soc);
145 StringTable::serialize(soc, string_space, space_size);
146 soc->do_tag(--tag);
147
148 // Dump/restore the misc information for system dictionary
149 SystemDictionaryShared::serialize(soc);
150 soc->do_tag(--tag);
151
152 soc->do_tag(666);
153 }
154
155 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
156 if (DumpSharedSpaces) {
157 if (_cds_i2i_entry_code_buffers == NULL) {
158 _cds_i2i_entry_code_buffers = (address)misc_data_space_alloc(total_size);
159 _cds_i2i_entry_code_buffers_size = total_size;
160 }
161 } else if (UseSharedSpaces) {
162 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
163 } else {
164 return NULL;
165 }
166
167 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
168 return _cds_i2i_entry_code_buffers;
169 }
170
171 // CDS code for dumping shared archive.
172
173 // Global object for holding classes that have been loaded. Since this
174 // is run at a safepoint just before exit, this is the entire set of classes.
175 static GrowableArray<Klass*>* _global_klass_objects;
176 static void collect_classes(Klass* k) {
177 _global_klass_objects->append_if_missing(k);
178 if (k->is_instance_klass()) {
179 // Add in the array classes too
180 InstanceKlass* ik = InstanceKlass::cast(k);
181 ik->array_klasses_do(collect_classes);
182 }
183 }
184
185 static void collect_classes2(Klass* k, ClassLoaderData* class_data) {
186 collect_classes(k);
187 }
188
189 static void remove_unshareable_in_classes() {
190 for (int i = 0; i < _global_klass_objects->length(); i++) {
191 Klass* k = _global_klass_objects->at(i);
192 k->remove_unshareable_info();
193 }
194 }
195
196 static void rewrite_nofast_bytecode(Method* method) {
197 RawBytecodeStream bcs(method);
198 while (!bcs.is_last_bytecode()) {
199 Bytecodes::Code opcode = bcs.raw_next();
200 switch (opcode) {
201 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
202 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
203 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
204 case Bytecodes::_iload: {
205 if (!bcs.is_wide()) {
206 *bcs.bcp() = Bytecodes::_nofast_iload;
207 }
208 break;
209 }
210 default: break;
211 }
212 }
213 }
214
215 // Walk all methods in the class list to ensure that they won't be modified at
216 // run time. This includes:
217 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
218 // at run time by RewriteBytecodes/RewriteFrequentPairs
219 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
220 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
221 for (int i = 0; i < _global_klass_objects->length(); i++) {
222 Klass* k = _global_klass_objects->at(i);
223 if (k->is_instance_klass()) {
224 InstanceKlass* ik = InstanceKlass::cast(k);
225 for (int i = 0; i < ik->methods()->length(); i++) {
226 Method* m = ik->methods()->at(i);
227 rewrite_nofast_bytecode(m);
228 Fingerprinter fp(m);
229 // The side effect of this call sets method's fingerprint field.
230 fp.fingerprint();
231 }
232 }
233 }
234 }
235
236 // Patch C++ vtable pointer in metadata.
237
238 // Klass and other metadata objects contain references to c++ vtables in the
239 // JVM library.
240 // Fix them to point to our constructed vtables. However, don't iterate
241 // across the space while doing this, as that causes the vtables to be
242 // patched, undoing our useful work. Instead, iterate to make a list,
243 // then use the list to do the fixing.
244 //
245 // Our constructed vtables:
246 // Dump time:
247 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs
248 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list
249 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and
250 // associated metadata to point to jump table rather than to current vtbl
251 // Table layout: NOTE FIXED SIZE
252 // 1. vtbl pointers
253 // 2. #Klass X #virtual methods per Klass
254 // 1 entry for each, in the order:
255 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry
256 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry
257 // ...
258 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry,
259 // ... Klass<vtbl_list_size>:method<num_virtuals> entry
260 // Sample entry: (Sparc):
261 // save(sp, -256, sp)
262 // ba,pt common_code
263 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255)
264 //
265 // Restore time:
266 // 1. initialize_shared_space: reserve space for table
267 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text
268 //
269 // Execution time:
270 // First virtual method call for any object of these metadata types:
271 // 1. object->klass
272 // 2. vtable entry for that klass points to the jump table entries
273 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index
274 // 4. common_code:
275 // Get address of new vtbl pointer for this Klass from updated table
276 // Update new vtbl pointer in the Klass: future virtual calls go direct
277 // Jump to method, using new vtbl pointer and method index
278
279
280 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) {
281 void* old_vtbl_ptr = *(void**)obj;
282 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) {
283 if (vtbl_list[i] == old_vtbl_ptr) {
284 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals;
285 }
286 }
287 ShouldNotReachHere();
288 return NULL;
289 }
290
291 // Assumes the vtable is in first slot in object.
292 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) {
293 int n = _global_klass_objects->length();
294 for (int i = 0; i < n; i++) {
295 Klass* obj = _global_klass_objects->at(i);
296 // Note is_instance_klass() is a virtual call in debug. After patching vtables
297 // all virtual calls on the dummy vtables will restore the original!
298 if (obj->is_instance_klass()) {
299 InstanceKlass* ik = InstanceKlass::cast(obj);
300 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik);
301 ConstantPool* cp = ik->constants();
302 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp);
303 for (int j = 0; j < ik->methods()->length(); j++) {
304 Method* m = ik->methods()->at(j);
305 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m);
306 }
307 } else {
308 // Array klasses
309 Klass* k = obj;
310 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k);
311 }
312 }
313 }
314
315 // Closure for serializing initialization data out to a data area to be
316 // written to the shared file.
317
318 class WriteClosure : public SerializeClosure {
319 private:
320 intptr_t* top;
321 char* end;
322
323 inline void check_space() {
324 if ((char*)top + sizeof(intptr_t) > end) {
325 report_out_of_shared_space(SharedMiscData);
326 }
327 }
328
329 public:
330 WriteClosure(char* md_top, char* md_end) {
331 top = (intptr_t*)md_top;
332 end = md_end;
333 }
334
335 char* get_top() { return (char*)top; }
336
337 void do_ptr(void** p) {
338 check_space();
339 *top = (intptr_t)*p;
340 ++top;
341 }
342
343 void do_u4(u4* p) {
344 void* ptr = (void*)(uintx(*p));
345 do_ptr(&ptr);
346 }
347
348 void do_tag(int tag) {
349 check_space();
350 *top = (intptr_t)tag;
351 ++top;
352 }
353
354 void do_region(u_char* start, size_t size) {
355 if ((char*)top + size > end) {
356 report_out_of_shared_space(SharedMiscData);
357 }
358 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
359 assert(size % sizeof(intptr_t) == 0, "bad size");
360 do_tag((int)size);
361 while (size > 0) {
362 *top = *(intptr_t*)start;
363 ++top;
364 start += sizeof(intptr_t);
365 size -= sizeof(intptr_t);
366 }
367 }
368
369 bool reading() const { return false; }
370 };
371
372 // This is for dumping detailed statistics for the allocations
373 // in the shared spaces.
374 class DumpAllocClosure : public Metaspace::AllocRecordClosure {
375 public:
376
377 // Here's poor man's enum inheritance
378 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
379 METASPACE_OBJ_TYPES_DO(f) \
380 f(SymbolHashentry) \
381 f(SymbolBucket) \
382 f(StringHashentry) \
383 f(StringBucket) \
384 f(Other)
385
386 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type,
387 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
388
389 enum Type {
390 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
391 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE)
392 _number_of_types
393 };
394
395 static const char * type_name(Type type) {
396 switch(type) {
397 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE)
398 default:
399 ShouldNotReachHere();
400 return NULL;
401 }
402 }
403
404 public:
405 enum {
406 RO = 0,
407 RW = 1
408 };
409
410 int _counts[2][_number_of_types];
411 int _bytes [2][_number_of_types];
412 int _which;
413
414 DumpAllocClosure() {
415 memset(_counts, 0, sizeof(_counts));
416 memset(_bytes, 0, sizeof(_bytes));
417 };
418
419 void iterate_metaspace(Metaspace* space, int which) {
420 assert(which == RO || which == RW, "sanity");
421 _which = which;
422 space->iterate(this);
423 }
424
425 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) {
426 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
427 _counts[_which][type] ++;
428 _bytes [_which][type] += byte_size;
429 }
430
431 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all);
432 };
433
434 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) {
435 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write
436 int other_bytes = md_all + mc_all;
437
438 // Calculate size of data that was not allocated by Metaspace::allocate()
439 MetaspaceSharedStats *stats = MetaspaceShared::stats();
440
441 // symbols
442 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
443 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
444 _bytes [RO][TypeArrayU4Type] -= stats->symbol.hashentry_bytes;
445
446 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
447 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
448 _bytes [RO][TypeArrayU4Type] -= stats->symbol.bucket_bytes;
449
450 // strings
451 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
452 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
453 _bytes [RO][TypeArrayU4Type] -= stats->string.hashentry_bytes;
454
455 _counts[RO][StringBucketType] = stats->string.bucket_count;
456 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
457 _bytes [RO][TypeArrayU4Type] -= stats->string.bucket_bytes;
458
459 // TODO: count things like dictionary, vtable, etc
460 _bytes[RW][OtherType] = other_bytes;
461
462 // prevent divide-by-zero
463 if (ro_all < 1) {
464 ro_all = 1;
465 }
466 if (rw_all < 1) {
467 rw_all = 1;
468 }
469
470 int all_ro_count = 0;
471 int all_ro_bytes = 0;
472 int all_rw_count = 0;
473 int all_rw_bytes = 0;
474
475 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
476 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
477 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
478 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
479
480 tty->print_cr("Detailed metadata info (rw includes md and mc):");
481 tty->print_cr("%s", hdr);
482 tty->print_cr("%s", sep);
483 for (int type = 0; type < int(_number_of_types); type ++) {
484 const char *name = type_name((Type)type);
485 int ro_count = _counts[RO][type];
486 int ro_bytes = _bytes [RO][type];
487 int rw_count = _counts[RW][type];
488 int rw_bytes = _bytes [RW][type];
489 int count = ro_count + rw_count;
490 int bytes = ro_bytes + rw_bytes;
491
492 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
493 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
494 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
495
496 tty->print_cr(fmt_stats, name,
497 ro_count, ro_bytes, ro_perc,
498 rw_count, rw_bytes, rw_perc,
499 count, bytes, perc);
500
501 all_ro_count += ro_count;
502 all_ro_bytes += ro_bytes;
503 all_rw_count += rw_count;
504 all_rw_bytes += rw_bytes;
505 }
506
507 int all_count = all_ro_count + all_rw_count;
508 int all_bytes = all_ro_bytes + all_rw_bytes;
509
510 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
511 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
512 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
513
514 tty->print_cr("%s", sep);
515 tty->print_cr(fmt_stats, "Total",
516 all_ro_count, all_ro_bytes, all_ro_perc,
517 all_rw_count, all_rw_bytes, all_rw_perc,
518 all_count, all_bytes, all_perc);
519
520 assert(all_ro_bytes == ro_all, "everything should have been counted");
521 assert(all_rw_bytes == rw_all, "everything should have been counted");
522 #undef fmt_stats
523 }
524
525 // Populate the shared space.
526
527 class VM_PopulateDumpSharedSpace: public VM_Operation {
528 private:
529 ClassLoaderData* _loader_data;
530 GrowableArray<Klass*> *_class_promote_order;
531 VirtualSpace _md_vs;
532 VirtualSpace _mc_vs;
533 VirtualSpace _od_vs;
534 GrowableArray<MemRegion> *_string_regions;
535
536 public:
537 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data,
538 GrowableArray<Klass*> *class_promote_order) :
539 _loader_data(loader_data) {
540 _class_promote_order = class_promote_order;
541 }
542
543 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
544 void doit(); // outline because gdb sucks
545
546 private:
547 void handle_misc_data_space_failure(bool success) {
548 if (!success) {
549 report_out_of_shared_space(SharedMiscData);
550 }
551 }
552 }; // class VM_PopulateDumpSharedSpace
553
554 void VM_PopulateDumpSharedSpace::doit() {
555 Thread* THREAD = VMThread::vm_thread();
556 NOT_PRODUCT(SystemDictionary::verify();)
557 // The following guarantee is meant to ensure that no loader constraints
558 // exist yet, since the constraints table is not shared. This becomes
559 // more important now that we don't re-initialize vtables/itables for
560 // shared classes at runtime, where constraints were previously created.
561 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
562 "loader constraints are not saved");
563 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
564 "placeholders are not saved");
565 // Revisit and implement this if we prelink method handle call sites:
566 guarantee(SystemDictionary::invoke_method_table() == NULL ||
567 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
568 "invoke method table is not saved");
569
570 // At this point, many classes have been loaded.
571 // Gather systemDictionary classes in a global array and do everything to
572 // that so we don't have to walk the SystemDictionary again.
573 _global_klass_objects = new GrowableArray<Klass*>(1000);
574 Universe::basic_type_classes_do(collect_classes);
575
576 // Need to call SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*))
577 // as we may have some classes with NULL ClassLoaderData* in the dictionary. Other
578 // variants of SystemDictionary::classes_do will skip those classes.
579 SystemDictionary::classes_do(collect_classes2);
580
581 tty->print_cr("Number of classes %d", _global_klass_objects->length());
582 {
583 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
584 for (int i = 0; i < _global_klass_objects->length(); i++) {
585 Klass* k = _global_klass_objects->at(i);
586 if (k->is_instance_klass()) {
587 num_inst ++;
588 } else if (k->is_objArray_klass()) {
589 num_obj_array ++;
590 } else {
591 assert(k->is_typeArray_klass(), "sanity");
592 num_type_array ++;
593 }
594 }
595 tty->print_cr(" instance classes = %5d", num_inst);
596 tty->print_cr(" obj array classes = %5d", num_obj_array);
597 tty->print_cr(" type array classes = %5d", num_type_array);
598 }
599
600
601 // Ensure the ConstMethods won't be modified at run-time
602 tty->print("Updating ConstMethods ... ");
603 rewrite_nofast_bytecodes_and_calculate_fingerprints();
604 tty->print_cr("done. ");
605
606 // Remove all references outside the metadata
607 tty->print("Removing unshareable information ... ");
608 remove_unshareable_in_classes();
609 tty->print_cr("done. ");
610
611 // Set up the misc data, misc code and optional data segments.
612 _md_vs = *MetaspaceShared::misc_data_region()->virtual_space();
613 _mc_vs = *MetaspaceShared::misc_code_region()->virtual_space();
614 _od_vs = *MetaspaceShared::optional_data_region()->virtual_space();
615 char* md_low = _md_vs.low();
616 char* md_top = MetaspaceShared::misc_data_region()->alloc_top();
617 char* md_end = _md_vs.high();
618 char* mc_low = _mc_vs.low();
619 char* mc_top = MetaspaceShared::misc_code_region()->alloc_top();
620 char* mc_end = _mc_vs.high();
621 char* od_low = _od_vs.low();
622 char* od_top = MetaspaceShared::optional_data_region()->alloc_top();
623 char* od_end = _od_vs.high();
624
625 // Reserve space for the list of Klass*s whose vtables are used
626 // for patching others as needed.
627
628 void** vtbl_list = (void**)md_top;
629 int vtbl_list_size = MetaspaceShared::vtbl_list_size;
630 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
631
632 md_top += vtbl_list_size * sizeof(void*);
633 void* vtable = md_top;
634
635 // Reserve space for a new dummy vtable for klass objects in the
636 // heap. Generate self-patching vtable entries.
637
638 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable,
639 &md_top, md_end,
640 &mc_top, mc_end);
641
642 guarantee(md_top <= md_end, "Insufficient space for vtables.");
643
644 // Reorder the system dictionary. (Moving the symbols affects
645 // how the hash table indices are calculated.)
646 // Not doing this either.
647
648 SystemDictionary::reorder_dictionary();
649 NOT_PRODUCT(SystemDictionary::verify();)
650 SystemDictionary::reverse();
651 SystemDictionary::copy_buckets(&md_top, md_end);
652
653 SystemDictionary::copy_table(&md_top, md_end);
654
655 // Write the other data to the output array.
656 // SymbolTable, StringTable and extra information for system dictionary
657 NOT_PRODUCT(SymbolTable::verify());
658 NOT_PRODUCT(StringTable::verify());
659 size_t ss_bytes = 0;
660 char* ss_low;
661 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details.
662 _string_regions = new GrowableArray<MemRegion>(2);
663
664 WriteClosure wc(md_top, md_end);
665 MetaspaceShared::serialize(&wc, _string_regions, &ss_bytes);
666 md_top = wc.get_top();
667 ss_low = _string_regions->is_empty() ? NULL : (char*)_string_regions->first().start();
668
669 // Print shared spaces all the time
670 Metaspace* ro_space = _loader_data->ro_metaspace();
671 Metaspace* rw_space = _loader_data->rw_metaspace();
672
673 // Allocated size of each space (may not be all occupied)
674 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType);
675 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType);
676 const size_t md_alloced = md_end-md_low;
677 const size_t mc_alloced = mc_end-mc_low;
678 const size_t od_alloced = od_end-od_low;
679 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced
680 + ss_bytes + od_alloced;
681
682 // Occupied size of each space.
683 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType);
684 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType);
685 const size_t md_bytes = size_t(md_top - md_low);
686 const size_t mc_bytes = size_t(mc_top - mc_low);
687 const size_t od_bytes = size_t(od_top - od_low);
688
689 // Percent of total size
690 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes + ss_bytes + od_bytes;
691 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0;
692 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0;
693 const double md_t_perc = md_bytes / double(total_bytes) * 100.0;
694 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0;
695 const double ss_t_perc = ss_bytes / double(total_bytes) * 100.0;
696 const double od_t_perc = od_bytes / double(total_bytes) * 100.0;
697
698 // Percent of fullness of each space
699 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0;
700 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0;
701 const double md_u_perc = md_bytes / double(md_alloced) * 100.0;
702 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0;
703 const double od_u_perc = od_bytes / double(od_alloced) * 100.0;
704 const double total_u_perc = total_bytes / double(total_alloced) * 100.0;
705
706 #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
707 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, p2i(ro_space->bottom()));
708 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, p2i(rw_space->bottom()));
709 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, p2i(md_low));
710 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, p2i(mc_low));
711 tty->print_cr(fmt_space, "st", ss_bytes, ss_t_perc, ss_bytes, 100.0, p2i(ss_low));
712 tty->print_cr(fmt_space, "od", od_bytes, od_t_perc, od_alloced, od_u_perc, p2i(od_low));
713 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
714 total_bytes, total_alloced, total_u_perc);
715
716 // Update the vtable pointers in all of the Klass objects in the
717 // heap. They should point to newly generated vtable.
718 patch_klass_vtables(vtbl_list, vtable);
719
720 // dunno what this is for.
721 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass);
722 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
723 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
724
725 // Create and write the archive file that maps the shared spaces.
726
727 FileMapInfo* mapinfo = new FileMapInfo();
728 mapinfo->populate_header(MetaspaceShared::max_alignment());
729 mapinfo->set_misc_data_patching_start((char*)vtbl_list);
730 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
731 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
732
733 for (int pass=1; pass<=2; pass++) {
734 if (pass == 1) {
735 // The first pass doesn't actually write the data to disk. All it
736 // does is to update the fields in the mapinfo->_header.
737 } else {
738 // After the first pass, the contents of mapinfo->_header are finalized,
739 // so we can compute the header's CRC, and write the contents of the header
740 // and the regions into disk.
741 mapinfo->open_for_write();
742 mapinfo->set_header_crc(mapinfo->compute_header_crc());
743 }
744 mapinfo->write_header();
745 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
746 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
747 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
748 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
749 SharedMiscDataSize,
750 false, true);
751 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
752 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
753 SharedMiscCodeSize,
754 true, true);
755 mapinfo->write_string_regions(_string_regions);
756 mapinfo->write_region(MetaspaceShared::od, _od_vs.low(),
757 pointer_delta(od_top, _od_vs.low(), sizeof(char)),
758 pointer_delta(od_end, _od_vs.low(), sizeof(char)),
759 true, false);
760 }
761
762 mapinfo->close();
763
764 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
765 os::free(saved_vtbl);
766
767 if (PrintSharedSpaces) {
768 DumpAllocClosure dac;
769 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO);
770 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW);
771
772 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes));
773 }
774 #undef fmt_space
775 }
776
777
778 void MetaspaceShared::link_one_shared_class(Klass* k, TRAPS) {
779 if (k->is_instance_klass()) {
780 InstanceKlass* ik = InstanceKlass::cast(k);
781 // Link the class to cause the bytecodes to be rewritten and the
782 // cpcache to be created. Class verification is done according
783 // to -Xverify setting.
784 _link_classes_made_progress |= try_link_class(ik, THREAD);
785 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
786 }
787 }
788
789 void MetaspaceShared::check_one_shared_class(Klass* k) {
790 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
791 _check_classes_made_progress = true;
792 }
793 }
794
795 void MetaspaceShared::check_shared_class_loader_type(Klass* k) {
796 if (k->is_instance_klass()) {
797 InstanceKlass* ik = InstanceKlass::cast(k);
798 u2 loader_type = ik->loader_type();
799 ResourceMark rm;
800 guarantee(loader_type != 0,
801 "Class loader type is not set for this class %s", ik->name()->as_C_string());
802 }
803 }
804
805 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
806 // We need to iterate because verification may cause additional classes
807 // to be loaded.
808 do {
809 _link_classes_made_progress = false;
810 SystemDictionary::classes_do(link_one_shared_class, THREAD);
811 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
812 } while (_link_classes_made_progress);
813
814 if (_has_error_classes) {
815 // Mark all classes whose super class or interfaces failed verification.
816 do {
817 // Not completely sure if we need to do this iteratively. Anyway,
818 // we should come here only if there are unverifiable classes, which
819 // shouldn't happen in normal cases. So better safe than sorry.
820 _check_classes_made_progress = false;
821 SystemDictionary::classes_do(check_one_shared_class);
822 } while (_check_classes_made_progress);
823
824 if (IgnoreUnverifiableClassesDuringDump) {
825 // This is useful when running JCK or SQE tests. You should not
826 // enable this when running real apps.
827 SystemDictionary::remove_classes_in_error_state();
828 } else {
829 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
830 exit(1);
831 }
832 }
833
834 // Copy the verification constraints from C_HEAP-alloced GrowableArrays to RO-alloced
835 // Arrays
836 SystemDictionaryShared::finalize_verification_constraints();
837 }
838
839 void MetaspaceShared::prepare_for_dumping() {
840 Arguments::check_unsupported_dumping_properties();
841 ClassLoader::initialize_shared_path();
842 FileMapInfo::allocate_classpath_entry_table();
843 }
844
845 // Preload classes from a list, populate the shared spaces and dump to a
846 // file.
847 void MetaspaceShared::preload_and_dump(TRAPS) {
848 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
849 ResourceMark rm;
850 char class_list_path_str[JVM_MAXPATHLEN];
851
852 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
853 MetaspaceShared::shared_rs()->size(),
854 p2i(MetaspaceShared::shared_rs()->base()));
855
856 // Preload classes to be shared.
857 // Should use some os:: method rather than fopen() here. aB.
858 const char* class_list_path;
859 if (SharedClassListFile == NULL) {
860 // Construct the path to the class list (in jre/lib)
861 // Walk up two directories from the location of the VM and
862 // optionally tack on "lib" (depending on platform)
863 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
864 for (int i = 0; i < 3; i++) {
865 char *end = strrchr(class_list_path_str, *os::file_separator());
866 if (end != NULL) *end = '\0';
867 }
868 int class_list_path_len = (int)strlen(class_list_path_str);
869 if (class_list_path_len >= 3) {
870 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
871 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
872 jio_snprintf(class_list_path_str + class_list_path_len,
873 sizeof(class_list_path_str) - class_list_path_len,
874 "%slib", os::file_separator());
875 class_list_path_len += 4;
876 }
877 }
878 }
879 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
880 jio_snprintf(class_list_path_str + class_list_path_len,
881 sizeof(class_list_path_str) - class_list_path_len,
882 "%sclasslist", os::file_separator());
883 }
884 class_list_path = class_list_path_str;
885 } else {
886 class_list_path = SharedClassListFile;
887 }
888
889 int class_count = 0;
890 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
891
892 // sun.io.Converters
893 static const char obj_array_sig[] = "[[Ljava/lang/Object;";
894 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
895
896 // java.util.HashMap
897 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
898 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
899
900 // Need to allocate the op here:
901 // op.misc_data_space_alloc() will be called during preload_and_dump().
902 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
903 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
904
905 tty->print_cr("Loading classes to share ...");
906 _has_error_classes = false;
907 class_count += preload_and_dump(class_list_path, class_promote_order,
908 THREAD);
909 if (ExtraSharedClassListFile) {
910 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
911 THREAD);
912 }
913 tty->print_cr("Loading classes to share: done.");
914
915 if (PrintSharedSpaces) {
916 tty->print_cr("Shared spaces: preloaded %d classes", class_count);
917 }
918
919 // Rewrite and link classes
920 tty->print_cr("Rewriting and linking classes ...");
921
922 // Link any classes which got missed. This would happen if we have loaded classes that
923 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
924 // fails verification, all other interfaces that were not specified in the classlist but
925 // are implemented by K are not verified.
926 link_and_cleanup_shared_classes(CATCH);
927 tty->print_cr("Rewriting and linking classes: done");
928
929 VMThread::execute(&op);
930 }
931 // Since various initialization steps have been undone by this process,
932 // it is not reasonable to continue running a java process.
933 exit(0);
934 }
935
936
937 int MetaspaceShared::preload_and_dump(const char* class_list_path,
938 GrowableArray<Klass*>* class_promote_order,
939 TRAPS) {
940 ClassListParser parser(class_list_path);
941 int class_count = 0;
942
943 while (parser.parse_one_line()) {
944 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
945
946 CLEAR_PENDING_EXCEPTION;
947 if (klass != NULL) {
948 if (PrintSharedSpaces && Verbose && WizardMode) {
949 ResourceMark rm;
950 tty->print_cr("Shared spaces preloaded: %s", klass->external_name());
951 }
952
953 InstanceKlass* ik = InstanceKlass::cast(klass);
954
955 // Should be class load order as per -Xlog:class+preorder
956 class_promote_order->append(ik);
957
958 // Link the class to cause the bytecodes to be rewritten and the
959 // cpcache to be created. The linking is done as soon as classes
960 // are loaded in order that the related data structures (klass and
961 // cpCache) are located together.
962 try_link_class(ik, THREAD);
963 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
964
965 class_count++;
966 }
967 }
968
969 return class_count;
970 }
971
972 // Returns true if the class's status has changed
973 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
974 assert(DumpSharedSpaces, "should only be called during dumping");
975 if (ik->init_state() < InstanceKlass::linked) {
976 bool saved = BytecodeVerificationLocal;
977 if (!(ik->is_shared_boot_class())) {
978 // The verification decision is based on BytecodeVerificationRemote
979 // for non-system classes. Since we are using the NULL classloader
980 // to load non-system classes during dumping, we need to temporarily
981 // change BytecodeVerificationLocal to be the same as
982 // BytecodeVerificationRemote. Note this can cause the parent system
983 // classes also being verified. The extra overhead is acceptable during
984 // dumping.
985 BytecodeVerificationLocal = BytecodeVerificationRemote;
986 }
987 ik->link_class(THREAD);
988 if (HAS_PENDING_EXCEPTION) {
989 ResourceMark rm;
990 tty->print_cr("Preload Warning: Verification failed for %s",
991 ik->external_name());
992 CLEAR_PENDING_EXCEPTION;
993 ik->set_in_error_state();
994 _has_error_classes = true;
995 }
996 BytecodeVerificationLocal = saved;
997 return true;
998 } else {
999 return false;
1000 }
1001 }
1002
1003 // Closure for serializing initialization data in from a data area
1004 // (ptr_array) read from the shared file.
1005
1006 class ReadClosure : public SerializeClosure {
1007 private:
1008 intptr_t** _ptr_array;
1009
1010 inline intptr_t nextPtr() {
1011 return *(*_ptr_array)++;
1012 }
1013
1014 public:
1015 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
1016
1017 void do_ptr(void** p) {
1018 assert(*p == NULL, "initializing previous initialized pointer.");
1019 intptr_t obj = nextPtr();
1020 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1021 "hit tag while initializing ptrs.");
1022 *p = (void*)obj;
1023 }
1024
1025 void do_u4(u4* p) {
1026 intptr_t obj = nextPtr();
1027 *p = (u4)(uintx(obj));
1028 }
1029
1030 void do_tag(int tag) {
1031 int old_tag;
1032 old_tag = (int)(intptr_t)nextPtr();
1033 // do_int(&old_tag);
1034 assert(tag == old_tag, "old tag doesn't match");
1035 FileMapInfo::assert_mark(tag == old_tag);
1036 }
1037
1038 void do_region(u_char* start, size_t size) {
1039 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1040 assert(size % sizeof(intptr_t) == 0, "bad size");
1041 do_tag((int)size);
1042 while (size > 0) {
1043 *(intptr_t*)start = nextPtr();
1044 start += sizeof(intptr_t);
1045 size -= sizeof(intptr_t);
1046 }
1047 }
1048
1049 bool reading() const { return true; }
1050 };
1051
1052 // Return true if given address is in the mapped shared space.
1053 bool MetaspaceShared::is_in_shared_space(const void* p) {
1054 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
1055 }
1056
1057 // Return true if given address is in the misc data region
1058 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
1059 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
1060 }
1061
1062 bool MetaspaceShared::is_string_region(int idx) {
1063 return (idx >= MetaspaceShared::first_string &&
1064 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings);
1065 }
1066
1067 void MetaspaceShared::print_shared_spaces() {
1068 if (UseSharedSpaces) {
1069 FileMapInfo::current_info()->print_shared_spaces();
1070 }
1071 }
1072
1073
1074 // Map shared spaces at requested addresses and return if succeeded.
1075 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1076 size_t image_alignment = mapinfo->alignment();
1077
1078 #ifndef _WINDOWS
1079 // Map in the shared memory and then map the regions on top of it.
1080 // On Windows, don't map the memory here because it will cause the
1081 // mappings of the regions to fail.
1082 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
1083 if (!shared_rs.is_reserved()) return false;
1084 #endif
1085
1086 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
1087
1088 char* _ro_base = NULL;
1089 char* _rw_base = NULL;
1090 char* _md_base = NULL;
1091 char* _mc_base = NULL;
1092 char* _od_base = NULL;
1093
1094 // Map each shared region
1095 if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
1096 mapinfo->verify_region_checksum(ro) &&
1097 (_rw_base = mapinfo->map_region(rw)) != NULL &&
1098 mapinfo->verify_region_checksum(rw) &&
1099 (_md_base = mapinfo->map_region(md)) != NULL &&
1100 mapinfo->verify_region_checksum(md) &&
1101 (_mc_base = mapinfo->map_region(mc)) != NULL &&
1102 mapinfo->verify_region_checksum(mc) &&
1103 (_od_base = mapinfo->map_region(od)) != NULL &&
1104 mapinfo->verify_region_checksum(od) &&
1105 (image_alignment == (size_t)max_alignment()) &&
1106 mapinfo->validate_classpath_entry_table()) {
1107 // Success (no need to do anything)
1108 return true;
1109 } else {
1110 // If there was a failure in mapping any of the spaces, unmap the ones
1111 // that succeeded
1112 if (_ro_base != NULL) mapinfo->unmap_region(ro);
1113 if (_rw_base != NULL) mapinfo->unmap_region(rw);
1114 if (_md_base != NULL) mapinfo->unmap_region(md);
1115 if (_mc_base != NULL) mapinfo->unmap_region(mc);
1116 if (_od_base != NULL) mapinfo->unmap_region(od);
1117 #ifndef _WINDOWS
1118 // Release the entire mapped region
1119 shared_rs.release();
1120 #endif
1121 // If -Xshare:on is specified, print out the error message and exit VM,
1122 // otherwise, set UseSharedSpaces to false and continue.
1123 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1124 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1125 } else {
1126 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1127 }
1128 return false;
1129 }
1130 }
1131
1132 // Read the miscellaneous data from the shared file, and
1133 // serialize it out to its various destinations.
1134
1135 void MetaspaceShared::initialize_shared_spaces() {
1136 FileMapInfo *mapinfo = FileMapInfo::current_info();
1137 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
1138 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
1139 char* buffer = mapinfo->misc_data_patching_start();
1140
1141 // Skip over (reserve space for) a list of addresses of C++ vtables
1142 // for Klass objects. They get filled in later.
1143
1144 void** vtbl_list = (void**)buffer;
1145 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*);
1146 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
1147
1148 // Skip over (reserve space for) dummy C++ vtables Klass objects.
1149 // They are used as is.
1150
1151 intptr_t vtable_size = *(intptr_t*)buffer;
1152 buffer += sizeof(intptr_t);
1153 buffer += vtable_size;
1154
1155 int sharedDictionaryLen = *(intptr_t*)buffer;
1156 buffer += sizeof(intptr_t);
1157 int number_of_entries = *(intptr_t*)buffer;
1158 buffer += sizeof(intptr_t);
1159 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1160 sharedDictionaryLen,
1161 number_of_entries);
1162 buffer += sharedDictionaryLen;
1163
1164 // The following data in the shared misc data region are the linked
1165 // list elements (HashtableEntry objects) for the shared dictionary
1166 // table.
1167
1168 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
1169 buffer += sizeof(intptr_t);
1170 buffer += len;
1171
1172 // Verify various attributes of the archive, plus initialize the
1173 // shared string/symbol tables
1174 intptr_t* array = (intptr_t*)buffer;
1175 ReadClosure rc(&array);
1176 serialize(&rc, NULL, NULL);
1177
1178 // Initialize the run-time symbol table.
1179 SymbolTable::create_table();
1180
1181 // Close the mapinfo file
1182 mapinfo->close();
1183
1184 if (PrintSharedArchiveAndExit) {
1185 if (PrintSharedDictionary) {
1186 tty->print_cr("\nShared classes:\n");
1187 SystemDictionary::print_shared(false);
1188 }
1189 if (_archive_loading_failed) {
1190 tty->print_cr("archive is invalid");
1191 vm_exit(1);
1192 } else {
1193 tty->print_cr("archive is valid");
1194 vm_exit(0);
1195 }
1196 }
1197 }
1198
1199 void MetaspaceShared::fixup_shared_string_regions() {
1200 FileMapInfo *mapinfo = FileMapInfo::current_info();
1201 mapinfo->fixup_string_regions();
1202 }
1203
1204 // JVM/TI RedefineClasses() support:
1205 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1206 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1207
1208 if (UseSharedSpaces) {
1209 // remap the shared readonly space to shared readwrite, private
1210 FileMapInfo* mapinfo = FileMapInfo::current_info();
1211 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1212 return false;
1213 }
1214 _remapped_readwrite = true;
1215 }
1216 return true;
1217 }
1218
1219 int MetaspaceShared::count_class(const char* classlist_file) {
1220 if (classlist_file == NULL) {
1221 return 0;
1222 }
1223 char class_name[256];
1224 int class_count = 0;
1225 FILE* file = fopen(classlist_file, "r");
1226 if (file != NULL) {
1227 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
1228 if (*class_name == '#') { // comment
1229 continue;
1230 }
1231 class_count++;
1232 }
1233 fclose(file);
1234 } else {
1235 char errmsg[JVM_MAXPATHLEN];
1236 os::lasterror(errmsg, JVM_MAXPATHLEN);
1237 tty->print_cr("Loading classlist failed: %s", errmsg);
1238 exit(1);
1239 }
1240
1241 return class_count;
1242 }
1243
1244 // the sizes are good for typical large applications that have a lot of shared
1245 // classes
1246 void MetaspaceShared::estimate_regions_size() {
1247 int class_count = count_class(SharedClassListFile);
1248 class_count += count_class(ExtraSharedClassListFile);
1249
1250 if (class_count > LargeThresholdClassCount) {
1251 if (class_count < HugeThresholdClassCount) {
1252 SET_ESTIMATED_SIZE(Large, ReadOnly);
1253 SET_ESTIMATED_SIZE(Large, ReadWrite);
1254 SET_ESTIMATED_SIZE(Large, MiscData);
1255 SET_ESTIMATED_SIZE(Large, MiscCode);
1256 } else {
1257 SET_ESTIMATED_SIZE(Huge, ReadOnly);
1258 SET_ESTIMATED_SIZE(Huge, ReadWrite);
1259 SET_ESTIMATED_SIZE(Huge, MiscData);
1260 SET_ESTIMATED_SIZE(Huge, MiscCode);
1261 }
1262 }
1263 }