1 /*
2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/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 "code/codeCache.hpp"
35 #include "gc/shared/gcLocker.hpp"
36 #include "interpreter/bytecodeStream.hpp"
37 #include "interpreter/bytecodes.hpp"
38 #include "memory/filemap.hpp"
39 #include "memory/metaspace.hpp"
40 #include "memory/metaspaceShared.hpp"
41 #include "oops/objArrayOop.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/vmThread.hpp"
46 #include "runtime/vm_operations.hpp"
47 #include "utilities/defaultStream.hpp"
48 #include "utilities/hashtable.inline.hpp"
49
50 int MetaspaceShared::_max_alignment = 0;
51
52 ReservedSpace* MetaspaceShared::_shared_rs = NULL;
53
54 MetaspaceSharedStats MetaspaceShared::_stats;
55
56 bool MetaspaceShared::_link_classes_made_progress;
57 bool MetaspaceShared::_check_classes_made_progress;
58 bool MetaspaceShared::_has_error_classes;
59 bool MetaspaceShared::_archive_loading_failed = false;
60 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
61 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
62 SharedMiscRegion MetaspaceShared::_mc;
63 SharedMiscRegion MetaspaceShared::_md;
64
65 void SharedMiscRegion::initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type) {
66 _vs.initialize(rs, committed_byte_size);
67 _alloc_top = _vs.low();
68 _space_type = space_type;
69 }
70
71 // NOT thread-safe, but this is called during dump time in single-threaded mode.
72 char* SharedMiscRegion::alloc(size_t num_bytes) {
73 assert(DumpSharedSpaces, "dump time only");
74 size_t alignment = sizeof(char*);
75 num_bytes = align_size_up(num_bytes, alignment);
76 _alloc_top = (char*)align_ptr_up(_alloc_top, alignment);
77 if (_alloc_top + num_bytes > _vs.high()) {
78 report_out_of_shared_space(_space_type);
79 }
80
81 char* p = _alloc_top;
82 _alloc_top += num_bytes;
83
84 memset(p, 0, num_bytes);
85 return p;
86 }
87
88 void MetaspaceShared::initialize_shared_rs(ReservedSpace* rs) {
89 assert(DumpSharedSpaces, "dump time only");
90 _shared_rs = rs;
91
92 // Split up and initialize the misc code and data spaces
93 size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize;
94 ReservedSpace shared_ro_rw = _shared_rs->first_part(metadata_size);
95 ReservedSpace misc_section = _shared_rs->last_part(metadata_size);
96
97 // Now split into misc sections.
98 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize);
99 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize);
100 _md.initialize(md_rs, SharedMiscDataSize, SharedMiscData);
101 _mc.initialize(mc_rs, SharedMiscCodeSize, SharedMiscData);
102 }
103
104 // Read/write a data stream for restoring/preserving metadata pointers and
105 // miscellaneous data from/to the shared archive file.
106
107 void MetaspaceShared::serialize(SerializeClosure* soc) {
108 int tag = 0;
109 soc->do_tag(--tag);
110
111 // Verify the sizes of various metadata in the system.
112 soc->do_tag(sizeof(Method));
113 soc->do_tag(sizeof(ConstMethod));
114 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
115 soc->do_tag(sizeof(ConstantPool));
116 soc->do_tag(sizeof(ConstantPoolCache));
117 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
118 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
119 soc->do_tag(sizeof(Symbol));
120
121 // Dump/restore miscellaneous metadata.
122 Universe::serialize(soc, true);
123 soc->do_tag(--tag);
124
125 // Dump/restore references to commonly used names and signatures.
126 vmSymbols::serialize(soc);
127 soc->do_tag(--tag);
128
129 soc->do_tag(666);
130 }
131
132 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
133 if (DumpSharedSpaces) {
134 if (_cds_i2i_entry_code_buffers == NULL) {
135 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
136 _cds_i2i_entry_code_buffers_size = total_size;
137 }
138 } else if (UseSharedSpaces) {
139 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
140 } else {
141 return NULL;
142 }
143
144 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
145 return _cds_i2i_entry_code_buffers;
146 }
147
148 // CDS code for dumping shared archive.
149
150 // Global object for holding classes that have been loaded. Since this
151 // is run at a safepoint just before exit, this is the entire set of classes.
152 static GrowableArray<Klass*>* _global_klass_objects;
153 static void collect_classes(Klass* k) {
154 _global_klass_objects->append_if_missing(k);
155 if (k->is_instance_klass()) {
156 // Add in the array classes too
157 InstanceKlass* ik = InstanceKlass::cast(k);
158 ik->array_klasses_do(collect_classes);
159 }
160 }
161
162 static void collect_classes2(Klass* k, ClassLoaderData* class_data) {
163 collect_classes(k);
164 }
165
166 static void remove_unshareable_in_classes() {
167 for (int i = 0; i < _global_klass_objects->length(); i++) {
168 Klass* k = _global_klass_objects->at(i);
169 k->remove_unshareable_info();
170 }
171 }
172
173 static void rewrite_nofast_bytecode(Method* method) {
174 RawBytecodeStream bcs(method);
175 while (!bcs.is_last_bytecode()) {
176 Bytecodes::Code opcode = bcs.raw_next();
177 switch (opcode) {
178 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
179 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
180 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
181 case Bytecodes::_iload: *bcs.bcp() = Bytecodes::_nofast_iload; break;
182 default: break;
183 }
184 }
185 }
186
187 // Walk all methods in the class list to ensure that they won't be modified at
188 // run time. This includes:
189 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
190 // at run time by RewriteBytecodes/RewriteFrequentPairs
191 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
192 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
193 for (int i = 0; i < _global_klass_objects->length(); i++) {
194 Klass* k = _global_klass_objects->at(i);
195 if (k->is_instance_klass()) {
196 InstanceKlass* ik = InstanceKlass::cast(k);
197 for (int i = 0; i < ik->methods()->length(); i++) {
198 Method* m = ik->methods()->at(i);
199 rewrite_nofast_bytecode(m);
200 Fingerprinter fp(m);
201 // The side effect of this call sets method's fingerprint field.
202 fp.fingerprint();
203 }
204 }
205 }
206 }
207
208 // Patch C++ vtable pointer in metadata.
209
210 // Klass and other metadata objects contain references to c++ vtables in the
211 // JVM library.
212 // Fix them to point to our constructed vtables. However, don't iterate
213 // across the space while doing this, as that causes the vtables to be
214 // patched, undoing our useful work. Instead, iterate to make a list,
215 // then use the list to do the fixing.
216 //
217 // Our constructed vtables:
218 // Dump time:
219 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs
220 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list
221 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and
222 // associated metadata to point to jump table rather than to current vtbl
223 // Table layout: NOTE FIXED SIZE
224 // 1. vtbl pointers
225 // 2. #Klass X #virtual methods per Klass
226 // 1 entry for each, in the order:
227 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry
228 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry
229 // ...
230 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry,
231 // ... Klass<vtbl_list_size>:method<num_virtuals> entry
232 // Sample entry: (Sparc):
233 // save(sp, -256, sp)
234 // ba,pt common_code
235 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255)
236 //
237 // Restore time:
238 // 1. initialize_shared_space: reserve space for table
239 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text
240 //
241 // Execution time:
242 // First virtual method call for any object of these metadata types:
243 // 1. object->klass
244 // 2. vtable entry for that klass points to the jump table entries
245 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index
246 // 4. common_code:
247 // Get address of new vtbl pointer for this Klass from updated table
248 // Update new vtbl pointer in the Klass: future virtual calls go direct
249 // Jump to method, using new vtbl pointer and method index
250
251
252 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) {
253 void* old_vtbl_ptr = *(void**)obj;
254 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) {
255 if (vtbl_list[i] == old_vtbl_ptr) {
256 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals;
257 }
258 }
259 ShouldNotReachHere();
260 return NULL;
261 }
262
263 // Assumes the vtable is in first slot in object.
264 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) {
265 int n = _global_klass_objects->length();
266 for (int i = 0; i < n; i++) {
267 Klass* obj = _global_klass_objects->at(i);
268 // Note is_instance_klass() is a virtual call in debug. After patching vtables
269 // all virtual calls on the dummy vtables will restore the original!
270 if (obj->is_instance_klass()) {
271 InstanceKlass* ik = InstanceKlass::cast(obj);
272 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik);
273 ConstantPool* cp = ik->constants();
274 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp);
275 for (int j = 0; j < ik->methods()->length(); j++) {
276 Method* m = ik->methods()->at(j);
277 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m);
278 }
279 } else {
280 // Array klasses
281 Klass* k = obj;
282 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k);
283 }
284 }
285 }
286
287 // Closure for serializing initialization data out to a data area to be
288 // written to the shared file.
289
290 class WriteClosure : public SerializeClosure {
291 private:
292 intptr_t* top;
293 char* end;
294
295 inline void check_space() {
296 if ((char*)top + sizeof(intptr_t) > end) {
297 report_out_of_shared_space(SharedMiscData);
298 }
299 }
300
301 public:
302 WriteClosure(char* md_top, char* md_end) {
303 top = (intptr_t*)md_top;
304 end = md_end;
305 }
306
307 char* get_top() { return (char*)top; }
308
309 void do_ptr(void** p) {
310 check_space();
311 *top = (intptr_t)*p;
312 ++top;
313 }
314
315 void do_tag(int tag) {
316 check_space();
317 *top = (intptr_t)tag;
318 ++top;
319 }
320
321 void do_region(u_char* start, size_t size) {
322 if ((char*)top + size > end) {
323 report_out_of_shared_space(SharedMiscData);
324 }
325 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
326 assert(size % sizeof(intptr_t) == 0, "bad size");
327 do_tag((int)size);
328 while (size > 0) {
329 *top = *(intptr_t*)start;
330 ++top;
331 start += sizeof(intptr_t);
332 size -= sizeof(intptr_t);
333 }
334 }
335
336 bool reading() const { return false; }
337 };
338
339 // This is for dumping detailed statistics for the allocations
340 // in the shared spaces.
341 class DumpAllocClosure : public Metaspace::AllocRecordClosure {
342 public:
343
344 // Here's poor man's enum inheritance
345 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
346 METASPACE_OBJ_TYPES_DO(f) \
347 f(SymbolHashentry) \
348 f(SymbolBucket) \
349 f(Other)
350
351 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type,
352 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
353
354 enum Type {
355 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
356 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE)
357 _number_of_types
358 };
359
360 static const char * type_name(Type type) {
361 switch(type) {
362 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE)
363 default:
364 ShouldNotReachHere();
365 return NULL;
366 }
367 }
368
369 public:
370 enum {
371 RO = 0,
372 RW = 1
373 };
374
375 int _counts[2][_number_of_types];
376 int _bytes [2][_number_of_types];
377 int _which;
378
379 DumpAllocClosure() {
380 memset(_counts, 0, sizeof(_counts));
381 memset(_bytes, 0, sizeof(_bytes));
382 };
383
384 void iterate_metaspace(Metaspace* space, int which) {
385 assert(which == RO || which == RW, "sanity");
386 _which = which;
387 space->iterate(this);
388 }
389
390 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) {
391 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
392 _counts[_which][type] ++;
393 _bytes [_which][type] += byte_size;
394 }
395
396 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all);
397 };
398
399 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) {
400 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write
401 int other_bytes = md_all + mc_all;
402
403 // Calculate size of data that was not allocated by Metaspace::allocate()
404 MetaspaceSharedStats *stats = MetaspaceShared::stats();
405
406 // symbols
407 _counts[RW][SymbolHashentryType] = stats->symbol.hashentry_count;
408 _bytes [RW][SymbolHashentryType] = stats->symbol.hashentry_bytes;
409 other_bytes -= stats->symbol.hashentry_bytes;
410
411 _counts[RW][SymbolBucketType] = stats->symbol.bucket_count;
412 _bytes [RW][SymbolBucketType] = stats->symbol.bucket_bytes;
413 other_bytes -= stats->symbol.bucket_bytes;
414
415 // TODO: count things like dictionary, vtable, etc
416 _bytes[RW][OtherType] = other_bytes;
417
418 // prevent divide-by-zero
419 if (ro_all < 1) {
420 ro_all = 1;
421 }
422 if (rw_all < 1) {
423 rw_all = 1;
424 }
425
426 int all_ro_count = 0;
427 int all_ro_bytes = 0;
428 int all_rw_count = 0;
429 int all_rw_bytes = 0;
430
431 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
432 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
433 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
434 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
435
436 tty->print_cr("Detailed metadata info (rw includes md and mc):");
437 tty->print_cr("%s", hdr);
438 tty->print_cr("%s", sep);
439 for (int type = 0; type < int(_number_of_types); type ++) {
440 const char *name = type_name((Type)type);
441 int ro_count = _counts[RO][type];
442 int ro_bytes = _bytes [RO][type];
443 int rw_count = _counts[RW][type];
444 int rw_bytes = _bytes [RW][type];
445 int count = ro_count + rw_count;
446 int bytes = ro_bytes + rw_bytes;
447
448 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
449 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
450 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
451
452 tty->print_cr(fmt_stats, name,
453 ro_count, ro_bytes, ro_perc,
454 rw_count, rw_bytes, rw_perc,
455 count, bytes, perc);
456
457 all_ro_count += ro_count;
458 all_ro_bytes += ro_bytes;
459 all_rw_count += rw_count;
460 all_rw_bytes += rw_bytes;
461 }
462
463 int all_count = all_ro_count + all_rw_count;
464 int all_bytes = all_ro_bytes + all_rw_bytes;
465
466 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
467 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
468 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
469
470 tty->print_cr("%s", sep);
471 tty->print_cr(fmt_stats, "Total",
472 all_ro_count, all_ro_bytes, all_ro_perc,
473 all_rw_count, all_rw_bytes, all_rw_perc,
474 all_count, all_bytes, all_perc);
475
476 assert(all_ro_bytes == ro_all, "everything should have been counted");
477 assert(all_rw_bytes == rw_all, "everything should have been counted");
478 #undef fmt_stats
479 }
480
481 // Populate the shared space.
482
483 class VM_PopulateDumpSharedSpace: public VM_Operation {
484 private:
485 ClassLoaderData* _loader_data;
486 GrowableArray<Klass*> *_class_promote_order;
487 VirtualSpace _md_vs;
488 VirtualSpace _mc_vs;
489 CompactHashtableWriter* _string_cht;
490 GrowableArray<MemRegion> *_string_regions;
491
492 public:
493 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data,
494 GrowableArray<Klass*> *class_promote_order) :
495 _loader_data(loader_data) {
496 _class_promote_order = class_promote_order;
497 }
498
499 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
500 void doit(); // outline because gdb sucks
501
502 private:
503 void handle_misc_data_space_failure(bool success) {
504 if (!success) {
505 report_out_of_shared_space(SharedMiscData);
506 }
507 }
508 }; // class VM_PopulateDumpSharedSpace
509
510 void VM_PopulateDumpSharedSpace::doit() {
511 Thread* THREAD = VMThread::vm_thread();
512 NOT_PRODUCT(SystemDictionary::verify();)
513 // The following guarantee is meant to ensure that no loader constraints
514 // exist yet, since the constraints table is not shared. This becomes
515 // more important now that we don't re-initialize vtables/itables for
516 // shared classes at runtime, where constraints were previously created.
517 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
518 "loader constraints are not saved");
519 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
520 "placeholders are not saved");
521 // Revisit and implement this if we prelink method handle call sites:
522 guarantee(SystemDictionary::invoke_method_table() == NULL ||
523 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
524 "invoke method table is not saved");
525
526 // At this point, many classes have been loaded.
527 // Gather systemDictionary classes in a global array and do everything to
528 // that so we don't have to walk the SystemDictionary again.
529 _global_klass_objects = new GrowableArray<Klass*>(1000);
530 Universe::basic_type_classes_do(collect_classes);
531
532 // Need to call SystemDictionary::classes_do(void f(Klass*, ClassLoaderData*))
533 // as we may have some classes with NULL ClassLoaderData* in the dictionary. Other
534 // variants of SystemDictionary::classes_do will skip those classes.
535 SystemDictionary::classes_do(collect_classes2);
536
537 tty->print_cr("Number of classes %d", _global_klass_objects->length());
538 {
539 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
540 for (int i = 0; i < _global_klass_objects->length(); i++) {
541 Klass* k = _global_klass_objects->at(i);
542 if (k->is_instance_klass()) {
543 num_inst ++;
544 } else if (k->is_objArray_klass()) {
545 num_obj_array ++;
546 } else {
547 assert(k->is_typeArray_klass(), "sanity");
548 num_type_array ++;
549 }
550 }
551 tty->print_cr(" instance classes = %5d", num_inst);
552 tty->print_cr(" obj array classes = %5d", num_obj_array);
553 tty->print_cr(" type array classes = %5d", num_type_array);
554 }
555
556
557 // Ensure the ConstMethods won't be modified at run-time
558 tty->print("Updating ConstMethods ... ");
559 rewrite_nofast_bytecodes_and_calculate_fingerprints();
560 tty->print_cr("done. ");
561
562 // Remove all references outside the metadata
563 tty->print("Removing unshareable information ... ");
564 remove_unshareable_in_classes();
565 tty->print_cr("done. ");
566
567 // Set up the share data and shared code segments.
568 _md_vs = *MetaspaceShared::misc_data_region()->virtual_space();
569 _mc_vs = *MetaspaceShared::misc_code_region()->virtual_space();
570 char* md_low = _md_vs.low();
571 char* md_top = MetaspaceShared::misc_data_region()->alloc_top();
572 char* md_end = _md_vs.high();
573 char* mc_low = _mc_vs.low();
574 char* mc_top = MetaspaceShared::misc_code_region()->alloc_top();
575 char* mc_end = _mc_vs.high();
576
577 // Reserve space for the list of Klass*s whose vtables are used
578 // for patching others as needed.
579
580 void** vtbl_list = (void**)md_top;
581 int vtbl_list_size = MetaspaceShared::vtbl_list_size;
582 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
583
584 md_top += vtbl_list_size * sizeof(void*);
585 void* vtable = md_top;
586
587 // Reserve space for a new dummy vtable for klass objects in the
588 // heap. Generate self-patching vtable entries.
589
590 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable,
591 &md_top, md_end,
592 &mc_top, mc_end);
593
594 // Reorder the system dictionary. (Moving the symbols affects
595 // how the hash table indices are calculated.)
596 // Not doing this either.
597
598 SystemDictionary::reorder_dictionary();
599
600 NOT_PRODUCT(SystemDictionary::verify();)
601
602 // Copy the symbol table, string table, and the system dictionary to the shared
603 // space in usable form. Copy the hashtable
604 // buckets first [read-write], then copy the linked lists of entries
605 // [read-only].
606
607 NOT_PRODUCT(SymbolTable::verify());
608 handle_misc_data_space_failure(SymbolTable::copy_compact_table(&md_top, md_end));
609
610 size_t ss_bytes = 0;
611 char* ss_low;
612 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details.
613 _string_regions = new GrowableArray<MemRegion>(2);
614 NOT_PRODUCT(StringTable::verify());
615 handle_misc_data_space_failure(StringTable::copy_compact_table(&md_top, md_end, _string_regions,
616 &ss_bytes));
617 ss_low = _string_regions->is_empty() ? NULL : (char*)_string_regions->first().start();
618
619 SystemDictionary::reverse();
620 SystemDictionary::copy_buckets(&md_top, md_end);
621
622 ClassLoader::verify();
623 ClassLoader::copy_package_info_buckets(&md_top, md_end);
624 ClassLoader::verify();
625
626 SystemDictionary::copy_table(&md_top, md_end);
627 ClassLoader::verify();
628 ClassLoader::copy_package_info_table(&md_top, md_end);
629 ClassLoader::verify();
630
631 // Write the other data to the output array.
632 WriteClosure wc(md_top, md_end);
633 MetaspaceShared::serialize(&wc);
634 md_top = wc.get_top();
635
636 // Print shared spaces all the time
637 // To make fmt_space be a syntactic constant (for format warnings), use #define.
638 #define fmt_space "%s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%4.1f%% used] at " INTPTR_FORMAT
639 Metaspace* ro_space = _loader_data->ro_metaspace();
640 Metaspace* rw_space = _loader_data->rw_metaspace();
641
642 // Allocated size of each space (may not be all occupied)
643 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType);
644 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType);
645 const size_t md_alloced = md_end-md_low;
646 const size_t mc_alloced = mc_end-mc_low;
647 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced
648 + ss_bytes;
649
650 // Occupied size of each space.
651 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType);
652 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType);
653 const size_t md_bytes = size_t(md_top - md_low);
654 const size_t mc_bytes = size_t(mc_top - mc_low);
655
656 // Percent of total size
657 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes + ss_bytes;
658 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0;
659 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0;
660 const double md_t_perc = md_bytes / double(total_bytes) * 100.0;
661 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0;
662 const double ss_t_perc = ss_bytes / double(total_bytes) * 100.0;
663
664 // Percent of fullness of each space
665 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0;
666 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0;
667 const double md_u_perc = md_bytes / double(md_alloced) * 100.0;
668 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0;
669 const double total_u_perc = total_bytes / double(total_alloced) * 100.0;
670
671 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, p2i(ro_space->bottom()));
672 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, p2i(rw_space->bottom()));
673 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, p2i(md_low));
674 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, p2i(mc_low));
675 tty->print_cr(fmt_space, "st", ss_bytes, ss_t_perc, ss_bytes, 100.0, p2i(ss_low));
676 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%4.1f%% used]",
677 total_bytes, total_alloced, total_u_perc);
678
679 // Update the vtable pointers in all of the Klass objects in the
680 // heap. They should point to newly generated vtable.
681 patch_klass_vtables(vtbl_list, vtable);
682
683 // dunno what this is for.
684 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass);
685 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
686 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
687
688 // Create and write the archive file that maps the shared spaces.
689
690 FileMapInfo* mapinfo = new FileMapInfo();
691 mapinfo->populate_header(MetaspaceShared::max_alignment());
692 mapinfo->set_misc_data_patching_start((char*)vtbl_list);
693 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
694 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
695
696 for (int pass=1; pass<=2; pass++) {
697 if (pass == 1) {
698 // The first pass doesn't actually write the data to disk. All it
699 // does is to update the fields in the mapinfo->_header.
700 } else {
701 // After the first pass, the contents of mapinfo->_header are finalized,
702 // so we can compute the header's CRC, and write the contents of the header
703 // and the regions into disk.
704 mapinfo->open_for_write();
705 mapinfo->set_header_crc(mapinfo->compute_header_crc());
706 }
707 mapinfo->write_header();
708 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true);
709 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false);
710 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(),
711 pointer_delta(md_top, _md_vs.low(), sizeof(char)),
712 SharedMiscDataSize,
713 false, false);
714 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(),
715 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)),
716 SharedMiscCodeSize,
717 false, true);
718 mapinfo->write_string_regions(_string_regions);
719 }
720
721 mapinfo->close();
722
723 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
724 os::free(saved_vtbl);
725
726 if (PrintSharedSpaces) {
727 DumpAllocClosure dac;
728 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO);
729 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW);
730
731 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes));
732 }
733 #undef fmt_space
734 }
735
736
737 void MetaspaceShared::link_one_shared_class(Klass* obj, TRAPS) {
738 Klass* k = obj;
739 if (k->is_instance_klass()) {
740 InstanceKlass* ik = InstanceKlass::cast(k);
741 // Link the class to cause the bytecodes to be rewritten and the
742 // cpcache to be created. Class verification is done according
743 // to -Xverify setting.
744 _link_classes_made_progress |= try_link_class(ik, THREAD);
745 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
746 }
747 }
748
749 void MetaspaceShared::check_one_shared_class(Klass* k) {
750 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
751 _check_classes_made_progress = true;
752 }
753 }
754
755 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
756 // We need to iterate because verification may cause additional classes
757 // to be loaded.
758 do {
759 _link_classes_made_progress = false;
760 SystemDictionary::classes_do(link_one_shared_class, THREAD);
761 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
762 } while (_link_classes_made_progress);
763
764 if (_has_error_classes) {
765 // Mark all classes whose super class or interfaces failed verification.
766 do {
767 // Not completely sure if we need to do this iteratively. Anyway,
768 // we should come here only if there are unverifiable classes, which
769 // shouldn't happen in normal cases. So better safe than sorry.
770 _check_classes_made_progress = false;
771 SystemDictionary::classes_do(check_one_shared_class);
772 } while (_check_classes_made_progress);
773
774 if (IgnoreUnverifiableClassesDuringDump) {
775 // This is useful when running JCK or SQE tests. You should not
776 // enable this when running real apps.
777 SystemDictionary::remove_classes_in_error_state();
778 } else {
779 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
780 exit(1);
781 }
782 }
783 }
784
785 void MetaspaceShared::prepare_for_dumping() {
786 ClassLoader::initialize_shared_path();
787 FileMapInfo::allocate_classpath_entry_table();
788 }
789
790 // Preload classes from a list, populate the shared spaces and dump to a
791 // file.
792 void MetaspaceShared::preload_and_dump(TRAPS) {
793 TraceTime timer("Dump Shared Spaces", TraceStartupTime);
794 ResourceMark rm;
795 char class_list_path_str[JVM_MAXPATHLEN];
796
797 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
798 MetaspaceShared::shared_rs()->size(),
799 p2i(MetaspaceShared::shared_rs()->base()));
800
801 // Preload classes to be shared.
802 // Should use some os:: method rather than fopen() here. aB.
803 const char* class_list_path;
804 if (SharedClassListFile == NULL) {
805 // Construct the path to the class list (in jre/lib)
806 // Walk up two directories from the location of the VM and
807 // optionally tack on "lib" (depending on platform)
808 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
809 for (int i = 0; i < 3; i++) {
810 char *end = strrchr(class_list_path_str, *os::file_separator());
811 if (end != NULL) *end = '\0';
812 }
813 int class_list_path_len = (int)strlen(class_list_path_str);
814 if (class_list_path_len >= 3) {
815 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
816 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
817 jio_snprintf(class_list_path_str + class_list_path_len,
818 sizeof(class_list_path_str) - class_list_path_len,
819 "%slib", os::file_separator());
820 class_list_path_len += 4;
821 }
822 }
823 }
824 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
825 jio_snprintf(class_list_path_str + class_list_path_len,
826 sizeof(class_list_path_str) - class_list_path_len,
827 "%sclasslist", os::file_separator());
828 }
829 class_list_path = class_list_path_str;
830 } else {
831 class_list_path = SharedClassListFile;
832 }
833
834 int class_count = 0;
835 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
836
837 // sun.io.Converters
838 static const char obj_array_sig[] = "[[Ljava/lang/Object;";
839 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
840
841 // java.util.HashMap
842 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
843 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
844
845 // Need to allocate the op here:
846 // op.misc_data_space_alloc() will be called during preload_and_dump().
847 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
848 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
849
850 tty->print_cr("Loading classes to share ...");
851 _has_error_classes = false;
852 class_count += preload_and_dump(class_list_path, class_promote_order,
853 THREAD);
854 if (ExtraSharedClassListFile) {
855 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
856 THREAD);
857 }
858 tty->print_cr("Loading classes to share: done.");
859
860 if (PrintSharedSpaces) {
861 tty->print_cr("Shared spaces: preloaded %d classes", class_count);
862 }
863
864 // Rewrite and link classes
865 tty->print_cr("Rewriting and linking classes ...");
866
867 // Link any classes which got missed. This would happen if we have loaded classes that
868 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
869 // fails verification, all other interfaces that were not specified in the classlist but
870 // are implemented by K are not verified.
871 link_and_cleanup_shared_classes(CATCH);
872 tty->print_cr("Rewriting and linking classes: done");
873
874 VMThread::execute(&op);
875 // Since various initialization steps have been undone by this process,
876 // it is not reasonable to continue running a java process.
877 exit(0);
878 }
879
880
881 int MetaspaceShared::preload_and_dump(const char* class_list_path,
882 GrowableArray<Klass*>* class_promote_order,
883 TRAPS) {
884 ClassListParser parser(class_list_path);
885 int class_count = 0;
886
887 while (parser.parse_one_line()) {
888 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
889
890 CLEAR_PENDING_EXCEPTION;
891 if (klass != NULL) {
892 if (PrintSharedSpaces && Verbose && WizardMode) {
893 ResourceMark rm;
894 tty->print_cr("Shared spaces preloaded: %s", klass->external_name());
895 }
896
897 InstanceKlass* ik = InstanceKlass::cast(klass);
898
899 // Should be class load order as per -XX:+TraceClassLoadingPreorder
900 class_promote_order->append(ik);
901
902 // Link the class to cause the bytecodes to be rewritten and the
903 // cpcache to be created. The linking is done as soon as classes
904 // are loaded in order that the related data structures (klass and
905 // cpCache) are located together.
906 try_link_class(ik, THREAD);
907 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
908
909 class_count++;
910 }
911 }
912
913 return class_count;
914 }
915
916 // Returns true if the class's status has changed
917 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
918 assert(DumpSharedSpaces, "should only be called during dumping");
919 if (ik->init_state() < InstanceKlass::linked) {
920 bool saved = BytecodeVerificationLocal;
921 if (!SharedClassUtil::is_shared_boot_class(ik)) {
922 // The verification decision is based on BytecodeVerificationRemote
923 // for non-system classes. Since we are using the NULL classloader
924 // to load non-system classes during dumping, we need to temporarily
925 // change BytecodeVerificationLocal to be the same as
926 // BytecodeVerificationRemote. Note this can cause the parent system
927 // classes also being verified. The extra overhead is acceptable during
928 // dumping.
929 BytecodeVerificationLocal = BytecodeVerificationRemote;
930 }
931 ik->link_class(THREAD);
932 if (HAS_PENDING_EXCEPTION) {
933 ResourceMark rm;
934 tty->print_cr("Preload Warning: Verification failed for %s",
935 ik->external_name());
936 CLEAR_PENDING_EXCEPTION;
937 ik->set_in_error_state();
938 _has_error_classes = true;
939 }
940 BytecodeVerificationLocal = saved;
941 return true;
942 } else {
943 return false;
944 }
945 }
946
947 // Closure for serializing initialization data in from a data area
948 // (ptr_array) read from the shared file.
949
950 class ReadClosure : public SerializeClosure {
951 private:
952 intptr_t** _ptr_array;
953
954 inline intptr_t nextPtr() {
955 return *(*_ptr_array)++;
956 }
957
958 public:
959 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
960
961 void do_ptr(void** p) {
962 assert(*p == NULL, "initializing previous initialized pointer.");
963 intptr_t obj = nextPtr();
964 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
965 "hit tag while initializing ptrs.");
966 *p = (void*)obj;
967 }
968
969 void do_tag(int tag) {
970 int old_tag;
971 old_tag = (int)(intptr_t)nextPtr();
972 // do_int(&old_tag);
973 assert(tag == old_tag, "old tag doesn't match");
974 FileMapInfo::assert_mark(tag == old_tag);
975 }
976
977 void do_region(u_char* start, size_t size) {
978 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
979 assert(size % sizeof(intptr_t) == 0, "bad size");
980 do_tag((int)size);
981 while (size > 0) {
982 *(intptr_t*)start = nextPtr();
983 start += sizeof(intptr_t);
984 size -= sizeof(intptr_t);
985 }
986 }
987
988 bool reading() const { return true; }
989 };
990
991 // Return true if given address is in the mapped shared space.
992 bool MetaspaceShared::is_in_shared_space(const void* p) {
993 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
994 }
995
996 bool MetaspaceShared::is_string_region(int idx) {
997 return (idx >= MetaspaceShared::first_string &&
998 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings);
999 }
1000
1001 void MetaspaceShared::print_shared_spaces() {
1002 if (UseSharedSpaces) {
1003 FileMapInfo::current_info()->print_shared_spaces();
1004 }
1005 }
1006
1007
1008 // Map shared spaces at requested addresses and return if succeeded.
1009 // Need to keep the bounds of the ro and rw space for the Metaspace::contains
1010 // call, or is_in_shared_space.
1011 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1012 size_t image_alignment = mapinfo->alignment();
1013
1014 #ifndef _WINDOWS
1015 // Map in the shared memory and then map the regions on top of it.
1016 // On Windows, don't map the memory here because it will cause the
1017 // mappings of the regions to fail.
1018 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
1019 if (!shared_rs.is_reserved()) return false;
1020 #endif
1021
1022 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
1023
1024 char* _ro_base = NULL;
1025 char* _rw_base = NULL;
1026 char* _md_base = NULL;
1027 char* _mc_base = NULL;
1028
1029 // Map each shared region
1030 if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
1031 mapinfo->verify_region_checksum(ro) &&
1032 (_rw_base = mapinfo->map_region(rw)) != NULL &&
1033 mapinfo->verify_region_checksum(rw) &&
1034 (_md_base = mapinfo->map_region(md)) != NULL &&
1035 mapinfo->verify_region_checksum(md) &&
1036 (_mc_base = mapinfo->map_region(mc)) != NULL &&
1037 mapinfo->verify_region_checksum(mc) &&
1038 (image_alignment == (size_t)max_alignment()) &&
1039 mapinfo->validate_classpath_entry_table()) {
1040 // Success (no need to do anything)
1041 return true;
1042 } else {
1043 // If there was a failure in mapping any of the spaces, unmap the ones
1044 // that succeeded
1045 if (_ro_base != NULL) mapinfo->unmap_region(ro);
1046 if (_rw_base != NULL) mapinfo->unmap_region(rw);
1047 if (_md_base != NULL) mapinfo->unmap_region(md);
1048 if (_mc_base != NULL) mapinfo->unmap_region(mc);
1049 #ifndef _WINDOWS
1050 // Release the entire mapped region
1051 shared_rs.release();
1052 #endif
1053 // If -Xshare:on is specified, print out the error message and exit VM,
1054 // otherwise, set UseSharedSpaces to false and continue.
1055 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1056 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1057 } else {
1058 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1059 }
1060 return false;
1061 }
1062 }
1063
1064 // Read the miscellaneous data from the shared file, and
1065 // serialize it out to its various destinations.
1066
1067 void MetaspaceShared::initialize_shared_spaces() {
1068 FileMapInfo *mapinfo = FileMapInfo::current_info();
1069 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
1070 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
1071 char* buffer = mapinfo->misc_data_patching_start();
1072
1073 // Skip over (reserve space for) a list of addresses of C++ vtables
1074 // for Klass objects. They get filled in later.
1075
1076 void** vtbl_list = (void**)buffer;
1077 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*);
1078 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
1079
1080 // Skip over (reserve space for) dummy C++ vtables Klass objects.
1081 // They are used as is.
1082
1083 intptr_t vtable_size = *(intptr_t*)buffer;
1084 buffer += sizeof(intptr_t);
1085 buffer += vtable_size;
1086
1087 // Create the shared symbol table using the compact table at this spot in the
1088 // misc data space. (Todo: move this to read-only space. Currently
1089 // this is mapped copy-on-write but will never be written into).
1090
1091 buffer = (char*)SymbolTable::init_shared_table(buffer);
1092 SymbolTable::create_table();
1093
1094 // Create the shared string table using the compact table
1095 buffer = (char*)StringTable::init_shared_table(mapinfo, buffer);
1096
1097 // Create the shared dictionary using the bucket array at this spot in
1098 // the misc data space. Since the shared dictionary table is never
1099 // modified, this region (of mapped pages) will be (effectively, if
1100 // not explicitly) read-only.
1101
1102 int sharedDictionaryLen = *(intptr_t*)buffer;
1103 buffer += sizeof(intptr_t);
1104 int number_of_entries = *(intptr_t*)buffer;
1105 buffer += sizeof(intptr_t);
1106 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1107 sharedDictionaryLen,
1108 number_of_entries);
1109 buffer += sharedDictionaryLen;
1110
1111 // Create the package info table using the bucket array at this spot in
1112 // the misc data space. Since the package info table is never
1113 // modified, this region (of mapped pages) will be (effectively, if
1114 // not explicitly) read-only.
1115
1116 int pkgInfoLen = *(intptr_t*)buffer;
1117 buffer += sizeof(intptr_t);
1118 number_of_entries = *(intptr_t*)buffer;
1119 buffer += sizeof(intptr_t);
1120 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen,
1121 number_of_entries);
1122 buffer += pkgInfoLen;
1123 ClassLoader::verify();
1124
1125 // The following data in the shared misc data region are the linked
1126 // list elements (HashtableEntry objects) for the shared dictionary
1127 // and package info table.
1128
1129 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
1130 buffer += sizeof(intptr_t);
1131 buffer += len;
1132
1133 len = *(intptr_t*)buffer; // skip over package info table entries
1134 buffer += sizeof(intptr_t);
1135 buffer += len;
1136
1137 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
1138 buffer += sizeof(intptr_t);
1139 buffer += len;
1140
1141 intptr_t* array = (intptr_t*)buffer;
1142 ReadClosure rc(&array);
1143 serialize(&rc);
1144
1145 // Close the mapinfo file
1146 mapinfo->close();
1147
1148 if (PrintSharedArchiveAndExit) {
1149 if (PrintSharedDictionary) {
1150 tty->print_cr("\nShared classes:\n");
1151 SystemDictionary::print_shared(false);
1152 }
1153 if (_archive_loading_failed) {
1154 tty->print_cr("archive is invalid");
1155 vm_exit(1);
1156 } else {
1157 tty->print_cr("archive is valid");
1158 vm_exit(0);
1159 }
1160 }
1161 }
1162
1163 void MetaspaceShared::fixup_shared_string_regions() {
1164 FileMapInfo *mapinfo = FileMapInfo::current_info();
1165 mapinfo->fixup_string_regions();
1166 }
1167
1168 // JVM/TI RedefineClasses() support:
1169 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1170 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1171
1172 if (UseSharedSpaces) {
1173 // remap the shared readonly space to shared readwrite, private
1174 FileMapInfo* mapinfo = FileMapInfo::current_info();
1175 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1176 return false;
1177 }
1178 }
1179 return true;
1180 }
1181
1182 int MetaspaceShared::count_class(const char* classlist_file) {
1183 if (classlist_file == NULL) {
1184 return 0;
1185 }
1186 char class_name[256];
1187 int class_count = 0;
1188 FILE* file = fopen(classlist_file, "r");
1189 if (file != NULL) {
1190 while ((fgets(class_name, sizeof class_name, file)) != NULL) {
1191 if (*class_name == '#') { // comment
1192 continue;
1193 }
1194 class_count++;
1195 }
1196 fclose(file);
1197 } else {
1198 char errmsg[JVM_MAXPATHLEN];
1199 os::lasterror(errmsg, JVM_MAXPATHLEN);
1200 tty->print_cr("Loading classlist failed: %s", errmsg);
1201 exit(1);
1202 }
1203
1204 return class_count;
1205 }
1206
1207 // the sizes are good for typical large applications that have a lot of shared
1208 // classes
1209 void MetaspaceShared::estimate_regions_size() {
1210 int class_count = count_class(SharedClassListFile);
1211 class_count += count_class(ExtraSharedClassListFile);
1212
1213 if (class_count > LargeThresholdClassCount) {
1214 if (class_count < HugeThresholdClassCount) {
1215 SET_ESTIMATED_SIZE(Large, ReadOnly);
1216 SET_ESTIMATED_SIZE(Large, ReadWrite);
1217 SET_ESTIMATED_SIZE(Large, MiscData);
1218 SET_ESTIMATED_SIZE(Large, MiscCode);
1219 } else {
1220 SET_ESTIMATED_SIZE(Huge, ReadOnly);
1221 SET_ESTIMATED_SIZE(Huge, ReadWrite);
1222 SET_ESTIMATED_SIZE(Huge, MiscData);
1223 SET_ESTIMATED_SIZE(Huge, MiscCode);
1224 }
1225 }
1226 }