1 /*
2 * Copyright (c) 2012, 2017, 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/stringTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/systemDictionaryShared.hpp"
36 #include "code/codeCache.hpp"
37 #if INCLUDE_ALL_GCS
38 #include "gc/g1/g1Allocator.inline.hpp"
39 #include "gc/g1/g1CollectedHeap.hpp"
40 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
41 #endif
42 #include "gc/shared/gcLocker.hpp"
43 #include "interpreter/bytecodeStream.hpp"
44 #include "interpreter/bytecodes.hpp"
45 #include "logging/log.hpp"
46 #include "logging/logMessage.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/metaspace.hpp"
49 #include "memory/metaspaceShared.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "oops/instanceClassLoaderKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/objArrayKlass.hpp"
55 #include "oops/objArrayOop.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/typeArrayKlass.hpp"
58 #include "prims/jvm.h"
59 #include "prims/jvmtiRedefineClasses.hpp"
60 #include "runtime/timerTrace.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/signature.hpp"
63 #include "runtime/vmThread.hpp"
64 #include "runtime/vm_operations.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/hashtable.inline.hpp"
68 #include "memory/metaspaceClosure.hpp"
69
70 ReservedSpace MetaspaceShared::_shared_rs;
71 VirtualSpace MetaspaceShared::_shared_vs;
72 MetaspaceSharedStats MetaspaceShared::_stats;
73 bool MetaspaceShared::_has_error_classes;
74 bool MetaspaceShared::_archive_loading_failed = false;
75 bool MetaspaceShared::_remapped_readwrite = false;
76 bool MetaspaceShared::_open_archive_heap_region_mapped = false;
77 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
78 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
79 size_t MetaspaceShared::_core_spaces_size = 0;
80
81 // The CDS archive is divided into the following regions:
82 // mc - misc code (the method entry trampolines)
83 // rw - read-write metadata
84 // ro - read-only metadata and read-only tables
85 // md - misc data (the c++ vtables)
86 // od - optional data (original class files)
87 //
88 // s0 - shared strings(closed archive heap space) #0
89 // s1 - shared strings(closed archive heap space) #1 (may be empty)
90 // oa0 - open archive heap space #0
91 // oa1 - open archive heap space #1 (may be empty)
92 //
93 // The mc, rw, ro, md and od regions are linearly allocated, starting from
94 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions
95 // are page-aligned, and there's no gap between any consecutive regions.
96 //
97 // These 5 regions are populated in the following steps:
98 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
99 // temporarily allocated outside of the shared regions. Only the method entry
100 // trampolines are written into the mc region.
101 // [2] ArchiveCompactor copies RW metadata into the rw region.
102 // [3] ArchiveCompactor copies RO metadata into the ro region.
103 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
104 // are copied into the ro region as read-only tables.
105 // [5] C++ vtables are copied into the md region.
106 // [6] Original class files are copied into the od region.
107 //
108 // The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects.
109 // Their layout is independent of the other 5 regions.
110
111 class DumpRegion {
112 private:
113 const char* _name;
114 char* _base;
115 char* _top;
116 char* _end;
117 bool _is_packed;
118
119 char* expand_top_to(char* newtop) {
120 assert(is_allocatable(), "must be initialized and not packed");
121 assert(newtop >= _top, "must not grow backwards");
122 if (newtop > _end) {
123 MetaspaceShared::report_out_of_space(_name, newtop - _top);
124 ShouldNotReachHere();
125 }
126 MetaspaceShared::commit_shared_space_to(newtop);
127 _top = newtop;
128 return _top;
129 }
130
131 public:
132 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {}
133
134 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) {
135 char* p = (char*)align_up(_top, alignment);
136 char* newtop = p + align_up(num_bytes, alignment);
137 expand_top_to(newtop);
138 memset(p, 0, newtop - p);
139 return p;
140 }
141
142 void append_intptr_t(intptr_t n) {
143 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
144 intptr_t *p = (intptr_t*)_top;
145 char* newtop = _top + sizeof(intptr_t);
146 expand_top_to(newtop);
147 *p = n;
148 }
149
150 char* base() const { return _base; }
151 char* top() const { return _top; }
152 char* end() const { return _end; }
153 size_t reserved() const { return _end - _base; }
154 size_t used() const { return _top - _base; }
155 bool is_packed() const { return _is_packed; }
156 bool is_allocatable() const {
157 return !is_packed() && _base != NULL;
158 }
159
160 double perc(size_t used, size_t total) const {
161 if (total == 0) {
162 total = 1;
163 }
164 return used / double(total) * 100.0;
165 }
166
167 void print(size_t total_bytes) const {
168 tty->print_cr("%-3s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT,
169 _name, used(), perc(used(), total_bytes), reserved(), perc(used(), reserved()), p2i(_base));
170 }
171 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
172 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
173 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
174 if (strcmp(_name, failing_region) == 0) {
175 tty->print_cr(" required = %d", int(needed_bytes));
176 } else {
177 tty->cr();
178 }
179 }
180
181 void init(const ReservedSpace* rs) {
182 _base = _top = rs->base();
183 _end = rs->end();
184 }
185 void init(char* b, char* t, char* e) {
186 _base = b;
187 _top = t;
188 _end = e;
189 }
190
191 void pack(DumpRegion* next = NULL) {
192 assert(!is_packed(), "sanity");
193 _end = (char*)align_up(_top, Metaspace::reserve_alignment());
194 _is_packed = true;
195 if (next != NULL) {
196 next->_base = next->_top = this->_end;
197 next->_end = MetaspaceShared::shared_rs()->end();
198 }
199 }
200 bool contains(char* p) {
201 return base() <= p && p < top();
202 }
203 };
204
205
206 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od");
207 size_t _total_string_region_size = 0, _total_open_archive_region_size = 0;
208
209 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
210 return _mc_region.allocate(num_bytes);
211 }
212
213 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
214 return _ro_region.allocate(num_bytes);
215 }
216
217 void MetaspaceShared::initialize_shared_rs() {
218 const size_t reserve_alignment = Metaspace::reserve_alignment();
219 bool large_pages = false; // No large pages when dumping the CDS archive.
220 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment);
221
222 #ifdef _LP64
223 // On 64-bit VM, the heap and class space layout will be the same as if
224 // you're running in -Xshare:on mode:
225 //
226 // +-- SharedBaseAddress (default = 0x800000000)
227 // v
228 // +-..---------+----+ ... +----+----+----+----+----+---------------+
229 // | Heap | ST | | MC | RW | RO | MD | OD | class space |
230 // +-..---------+----+ ... +----+----+----+----+----+---------------+
231 // |<--MaxHeapSize->| |<-- UnscaledClassSpaceMax = 4GB ------->|
232 //
233 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
234 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
235 #else
236 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space.
237 size_t cds_total = align_down(256*M, reserve_alignment);
238 #endif
239
240 // First try to reserve the space at the specified SharedBaseAddress.
241 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base);
242 if (_shared_rs.is_reserved()) {
243 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match");
244 } else {
245 // Get a mmap region anywhere if the SharedBaseAddress fails.
246 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages);
247 }
248 if (!_shared_rs.is_reserved()) {
249 vm_exit_during_initialization("Unable to reserve memory for shared space",
250 err_msg(SIZE_FORMAT " bytes.", cds_total));
251 }
252
253 #ifdef _LP64
254 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up:
255 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes()
256 // will store Klasses into this space.
257 // + The lower 3 GB is used for the archive -- when preload_classes() is done,
258 // ArchiveCompactor will copy the class metadata into this space, first the RW parts,
259 // then the RO parts.
260
261 assert(UseCompressedOops && UseCompressedClassPointers,
262 "UseCompressedOops and UseCompressedClassPointers must be set");
263
264 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment);
265 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size);
266 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment);
267 _shared_rs = _shared_rs.first_part(max_archive_size);
268
269 // Set up compress class pointers.
270 Universe::set_narrow_klass_base((address)_shared_rs.base());
271 if (UseAOT || cds_total > UnscaledClassSpaceMax) {
272 // AOT forces narrow_klass_shift=LogKlassAlignmentInBytes
273 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
274 } else {
275 Universe::set_narrow_klass_shift(0);
276 }
277
278 Metaspace::initialize_class_space(tmp_class_space);
279 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
280 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
281
282 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
283 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
284 #endif
285
286 // Start with 0 committed bytes. The memory will be committed as needed by
287 // MetaspaceShared::commit_shared_space_to().
288 if (!_shared_vs.initialize(_shared_rs, 0)) {
289 vm_exit_during_initialization("Unable to allocate memory for shared space");
290 }
291
292 _mc_region.init(&_shared_rs);
293 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
294 _shared_rs.size(), p2i(_shared_rs.base()));
295 }
296
297 void MetaspaceShared::commit_shared_space_to(char* newtop) {
298 assert(DumpSharedSpaces, "dump-time only");
299 char* base = _shared_rs.base();
300 size_t need_committed_size = newtop - base;
301 size_t has_committed_size = _shared_vs.committed_size();
302 if (need_committed_size < has_committed_size) {
303 return;
304 }
305
306 size_t min_bytes = need_committed_size - has_committed_size;
307 size_t preferred_bytes = 1 * M;
308 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size;
309
310 size_t commit = MAX2(min_bytes, preferred_bytes);
311 assert(commit <= uncommitted, "sanity");
312
313 bool result = _shared_vs.expand_by(commit, false);
314 if (!result) {
315 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
316 need_committed_size));
317 }
318
319 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
320 commit, _shared_vs.actual_committed_size(), _shared_vs.high());
321 }
322
323 // Read/write a data stream for restoring/preserving metadata pointers and
324 // miscellaneous data from/to the shared archive file.
325
326 void MetaspaceShared::serialize(SerializeClosure* soc) {
327 int tag = 0;
328 soc->do_tag(--tag);
329
330 // Verify the sizes of various metadata in the system.
331 soc->do_tag(sizeof(Method));
332 soc->do_tag(sizeof(ConstMethod));
333 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
334 soc->do_tag(sizeof(ConstantPool));
335 soc->do_tag(sizeof(ConstantPoolCache));
336 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
337 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
338 soc->do_tag(sizeof(Symbol));
339
340 // Dump/restore miscellaneous metadata.
341 Universe::serialize(soc, true);
342 soc->do_tag(--tag);
343
344 // Dump/restore references to commonly used names and signatures.
345 vmSymbols::serialize(soc);
346 soc->do_tag(--tag);
347
348 // Dump/restore the symbol and string tables
349 SymbolTable::serialize(soc);
350 StringTable::serialize(soc);
351 soc->do_tag(--tag);
352
353 soc->do_tag(666);
354 }
355
356 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
357 if (DumpSharedSpaces) {
358 if (_cds_i2i_entry_code_buffers == NULL) {
359 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
360 _cds_i2i_entry_code_buffers_size = total_size;
361 }
362 } else if (UseSharedSpaces) {
363 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
364 } else {
365 return NULL;
366 }
367
368 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
369 return _cds_i2i_entry_code_buffers;
370 }
371
372 // CDS code for dumping shared archive.
373
374 // Global object for holding classes that have been loaded. Since this
375 // is run at a safepoint just before exit, this is the entire set of classes.
376 static GrowableArray<Klass*>* _global_klass_objects;
377
378 static void collect_array_classes(Klass* k) {
379 _global_klass_objects->append_if_missing(k);
380 if (k->is_array_klass()) {
381 // Add in the array classes too
382 ArrayKlass* ak = ArrayKlass::cast(k);
383 Klass* h = ak->higher_dimension();
384 if (h != NULL) {
385 h->array_klasses_do(collect_array_classes);
386 }
387 }
388 }
389
390 class CollectClassesClosure : public KlassClosure {
391 void do_klass(Klass* k) {
392 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) {
393 _global_klass_objects->append_if_missing(k);
394 }
395 if (k->is_array_klass()) {
396 // Add in the array classes too
397 ArrayKlass* ak = ArrayKlass::cast(k);
398 Klass* h = ak->higher_dimension();
399 if (h != NULL) {
400 h->array_klasses_do(collect_array_classes);
401 }
402 }
403 }
404 };
405
406 static void remove_unshareable_in_classes() {
407 for (int i = 0; i < _global_klass_objects->length(); i++) {
408 Klass* k = _global_klass_objects->at(i);
409 if (!k->is_objArray_klass()) {
410 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
411 // on their array classes.
412 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
413 k->remove_unshareable_info();
414 }
415 }
416 }
417
418 static void remove_java_mirror_in_classes() {
419 for (int i = 0; i < _global_klass_objects->length(); i++) {
420 Klass* k = _global_klass_objects->at(i);
421 if (!k->is_objArray_klass()) {
422 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
423 // on their array classes.
424 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
425 k->remove_java_mirror();
426 }
427 }
428 }
429
430 static void rewrite_nofast_bytecode(Method* method) {
431 BytecodeStream bcs(method);
432 while (!bcs.is_last_bytecode()) {
433 Bytecodes::Code opcode = bcs.next();
434 switch (opcode) {
435 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
436 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
437 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
438 case Bytecodes::_iload: {
439 if (!bcs.is_wide()) {
440 *bcs.bcp() = Bytecodes::_nofast_iload;
441 }
442 break;
443 }
444 default: break;
445 }
446 }
447 }
448
449 // Walk all methods in the class list to ensure that they won't be modified at
450 // run time. This includes:
451 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
452 // at run time by RewriteBytecodes/RewriteFrequentPairs
453 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
454 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
455 for (int i = 0; i < _global_klass_objects->length(); i++) {
456 Klass* k = _global_klass_objects->at(i);
457 if (k->is_instance_klass()) {
458 InstanceKlass* ik = InstanceKlass::cast(k);
459 for (int i = 0; i < ik->methods()->length(); i++) {
460 Method* m = ik->methods()->at(i);
461 rewrite_nofast_bytecode(m);
462 Fingerprinter fp(m);
463 // The side effect of this call sets method's fingerprint field.
464 fp.fingerprint();
465 }
466 }
467 }
468 }
469
470 static void relocate_cached_class_file() {
471 for (int i = 0; i < _global_klass_objects->length(); i++) {
472 Klass* k = _global_klass_objects->at(i);
473 if (k->is_instance_klass()) {
474 InstanceKlass* ik = InstanceKlass::cast(k);
475 JvmtiCachedClassFileData* p = ik->get_archived_class_data();
476 if (p != NULL) {
477 int size = offset_of(JvmtiCachedClassFileData, data) + p->length;
478 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size);
479 q->length = p->length;
480 memcpy(q->data, p->data, p->length);
481 ik->set_archived_class_data(q);
482 }
483 }
484 }
485 }
486
487 NOT_PRODUCT(
488 static void assert_not_anonymous_class(InstanceKlass* k) {
489 assert(!(k->is_anonymous()), "cannot archive anonymous classes");
490 }
491
492 // Anonymous classes are not stored inside any dictionaries. They are created by
493 // SystemDictionary::parse_stream() with a non-null host_klass.
494 static void assert_no_anonymoys_classes_in_dictionaries() {
495 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class);
496 })
497
498 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
499 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
500 //
501 // Addresses of the vtables and the methods may be different across JVM runs,
502 // if libjvm.so is dynamically loaded at a different base address.
503 //
504 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
505 //
506 // + at dump time: we redirect the _vptr to point to our own vtables inside
507 // the CDS image
508 // + at run time: we clone the actual contents of the vtables from libjvm.so
509 // into our own tables.
510
511 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
512 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
513 f(ConstantPool) \
514 f(InstanceKlass) \
515 f(InstanceClassLoaderKlass) \
516 f(InstanceMirrorKlass) \
517 f(InstanceRefKlass) \
518 f(Method) \
519 f(ObjArrayKlass) \
520 f(TypeArrayKlass)
521
522 class CppVtableInfo {
523 intptr_t _vtable_size;
524 intptr_t _cloned_vtable[1];
525 public:
526 static int num_slots(int vtable_size) {
527 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
528 }
529 int vtable_size() { return int(uintx(_vtable_size)); }
530 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
531 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
532 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
533 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
534 static size_t byte_size(int vtable_size) {
535 CppVtableInfo i;
536 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
537 }
538 };
539
540 template <class T> class CppVtableCloner : public T {
541 static intptr_t* vtable_of(Metadata& m) {
542 return *((intptr_t**)&m);
543 }
544 static CppVtableInfo* _info;
545
546 static int get_vtable_length(const char* name);
547
548 public:
549 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
550 static intptr_t* allocate(const char* name);
551
552 // Clone the vtable to ...
553 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
554
555 static void zero_vtable_clone() {
556 assert(DumpSharedSpaces, "dump-time only");
557 _info->zero();
558 }
559
560 // Switch the vtable pointer to point to the cloned vtable.
561 static void patch(Metadata* obj) {
562 assert(DumpSharedSpaces, "dump-time only");
563 *(void**)obj = (void*)(_info->cloned_vtable());
564 }
565
566 static bool is_valid_shared_object(const T* obj) {
567 intptr_t* vptr = *(intptr_t**)obj;
568 return vptr == _info->cloned_vtable();
569 }
570 };
571
572 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
573
574 template <class T>
575 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
576 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
577 int n = get_vtable_length(name);
578 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
579 _info->set_vtable_size(n);
580
581 intptr_t* p = clone_vtable(name, _info);
582 assert((char*)p == _md_region.top(), "must be");
583
584 return p;
585 }
586
587 template <class T>
588 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
589 if (!DumpSharedSpaces) {
590 assert(_info == 0, "_info is initialized only at dump time");
591 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
592 }
593 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
594 int n = info->vtable_size();
595 intptr_t* srcvtable = vtable_of(tmp);
596 intptr_t* dstvtable = info->cloned_vtable();
597
598 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
599 // safe to do memcpy.
600 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
601 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
602 return dstvtable + n;
603 }
604
605 // To determine the size of the vtable for each type, we use the following
606 // trick by declaring 2 subclasses:
607 //
608 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
609 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
610 //
611 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
612 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
613 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
614 // - Their last entry is different.
615 //
616 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
617 // and find the first entry that's different.
618 //
619 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
620 // esoteric compilers.
621
622 template <class T> class CppVtableTesterB: public T {
623 public:
624 virtual int last_virtual_method() {return 1;}
625 };
626
627 template <class T> class CppVtableTesterA : public T {
628 public:
629 virtual void* last_virtual_method() {
630 // Make this different than CppVtableTesterB::last_virtual_method so the C++
631 // compiler/linker won't alias the two functions.
632 return NULL;
633 }
634 };
635
636 template <class T>
637 int CppVtableCloner<T>::get_vtable_length(const char* name) {
638 CppVtableTesterA<T> a;
639 CppVtableTesterB<T> b;
640
641 intptr_t* avtable = vtable_of(a);
642 intptr_t* bvtable = vtable_of(b);
643
644 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
645 int vtable_len = 1;
646 for (; ; vtable_len++) {
647 if (avtable[vtable_len] != bvtable[vtable_len]) {
648 break;
649 }
650 }
651 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
652
653 return vtable_len;
654 }
655
656 #define ALLOC_CPP_VTABLE_CLONE(c) \
657 CppVtableCloner<c>::allocate(#c);
658
659 #define CLONE_CPP_VTABLE(c) \
660 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
661
662 #define ZERO_CPP_VTABLE(c) \
663 CppVtableCloner<c>::zero_vtable_clone();
664
665 // This can be called at both dump time and run time.
666 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
667 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
668 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
669 return p;
670 }
671
672 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
673 assert(DumpSharedSpaces, "dump-time only");
674 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
675 }
676
677 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
678 void MetaspaceShared::allocate_cpp_vtable_clones() {
679 assert(DumpSharedSpaces, "dump-time only");
680 // Layout (each slot is a intptr_t):
681 // [number of slots in the first vtable = n1]
682 // [ <n1> slots for the first vtable]
683 // [number of slots in the first second = n2]
684 // [ <n2> slots for the second vtable]
685 // ...
686 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
687 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
688 }
689
690 // Switch the vtable pointer to point to the cloned vtable. We assume the
691 // vtable pointer is in first slot in object.
692 void MetaspaceShared::patch_cpp_vtable_pointers() {
693 int n = _global_klass_objects->length();
694 for (int i = 0; i < n; i++) {
695 Klass* obj = _global_klass_objects->at(i);
696 if (obj->is_instance_klass()) {
697 InstanceKlass* ik = InstanceKlass::cast(obj);
698 if (ik->is_class_loader_instance_klass()) {
699 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
700 } else if (ik->is_reference_instance_klass()) {
701 CppVtableCloner<InstanceRefKlass>::patch(ik);
702 } else if (ik->is_mirror_instance_klass()) {
703 CppVtableCloner<InstanceMirrorKlass>::patch(ik);
704 } else {
705 CppVtableCloner<InstanceKlass>::patch(ik);
706 }
707 ConstantPool* cp = ik->constants();
708 CppVtableCloner<ConstantPool>::patch(cp);
709 for (int j = 0; j < ik->methods()->length(); j++) {
710 Method* m = ik->methods()->at(j);
711 CppVtableCloner<Method>::patch(m);
712 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
713 }
714 } else if (obj->is_objArray_klass()) {
715 CppVtableCloner<ObjArrayKlass>::patch(obj);
716 } else {
717 assert(obj->is_typeArray_klass(), "sanity");
718 CppVtableCloner<TypeArrayKlass>::patch(obj);
719 }
720 }
721 }
722
723 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
724 assert(is_in_shared_space(m), "must be");
725 return CppVtableCloner<Method>::is_valid_shared_object(m);
726 }
727
728 // Closure for serializing initialization data out to a data area to be
729 // written to the shared file.
730
731 class WriteClosure : public SerializeClosure {
732 private:
733 DumpRegion* _dump_region;
734
735 public:
736 WriteClosure(DumpRegion* r) {
737 _dump_region = r;
738 }
739
740 void do_ptr(void** p) {
741 _dump_region->append_intptr_t((intptr_t)*p);
742 }
743
744 void do_u4(u4* p) {
745 void* ptr = (void*)(uintx(*p));
746 do_ptr(&ptr);
747 }
748
749 void do_tag(int tag) {
750 _dump_region->append_intptr_t((intptr_t)tag);
751 }
752
753 void do_region(u_char* start, size_t size) {
754 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
755 assert(size % sizeof(intptr_t) == 0, "bad size");
756 do_tag((int)size);
757 while (size > 0) {
758 _dump_region->append_intptr_t(*(intptr_t*)start);
759 start += sizeof(intptr_t);
760 size -= sizeof(intptr_t);
761 }
762 }
763
764 bool reading() const { return false; }
765 };
766
767 // This is for dumping detailed statistics for the allocations
768 // in the shared spaces.
769 class DumpAllocStats : public ResourceObj {
770 public:
771
772 // Here's poor man's enum inheritance
773 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
774 METASPACE_OBJ_TYPES_DO(f) \
775 f(SymbolHashentry) \
776 f(SymbolBucket) \
777 f(StringHashentry) \
778 f(StringBucket) \
779 f(Other)
780
781 enum Type {
782 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
783 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
784 _number_of_types
785 };
786
787 static const char * type_name(Type type) {
788 switch(type) {
789 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
790 default:
791 ShouldNotReachHere();
792 return NULL;
793 }
794 }
795
796 public:
797 enum { RO = 0, RW = 1 };
798
799 int _counts[2][_number_of_types];
800 int _bytes [2][_number_of_types];
801
802 DumpAllocStats() {
803 memset(_counts, 0, sizeof(_counts));
804 memset(_bytes, 0, sizeof(_bytes));
805 };
806
807 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
808 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
809 int which = (read_only) ? RO : RW;
810 _counts[which][type] ++;
811 _bytes [which][type] += byte_size;
812 }
813
814 void record_other_type(int byte_size, bool read_only) {
815 int which = (read_only) ? RO : RW;
816 _bytes [which][OtherType] += byte_size;
817 }
818 void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
819 };
820
821 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
822 // Calculate size of data that was not allocated by Metaspace::allocate()
823 MetaspaceSharedStats *stats = MetaspaceShared::stats();
824
825 // symbols
826 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
827 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
828
829 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
830 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
831
832 // strings
833 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
834 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
835
836 _counts[RO][StringBucketType] = stats->string.bucket_count;
837 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
838
839 // TODO: count things like dictionary, vtable, etc
840 _bytes[RW][OtherType] += mc_all + md_all;
841 rw_all += mc_all + md_all; // mc/md are mapped Read/Write
842
843 // prevent divide-by-zero
844 if (ro_all < 1) {
845 ro_all = 1;
846 }
847 if (rw_all < 1) {
848 rw_all = 1;
849 }
850
851 int all_ro_count = 0;
852 int all_ro_bytes = 0;
853 int all_rw_count = 0;
854 int all_rw_bytes = 0;
855
856 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
857 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
858 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
859 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
860
861 ResourceMark rm;
862 LogMessage(cds) msg;
863 stringStream info_stream;
864
865 info_stream.print_cr("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
866 info_stream.print_cr("%s", hdr);
867 info_stream.print_cr("%s", sep);
868 for (int type = 0; type < int(_number_of_types); type ++) {
869 const char *name = type_name((Type)type);
870 int ro_count = _counts[RO][type];
871 int ro_bytes = _bytes [RO][type];
872 int rw_count = _counts[RW][type];
873 int rw_bytes = _bytes [RW][type];
874 int count = ro_count + rw_count;
875 int bytes = ro_bytes + rw_bytes;
876
877 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
878 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
879 double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
880
881 info_stream.print_cr(fmt_stats, name,
882 ro_count, ro_bytes, ro_perc,
883 rw_count, rw_bytes, rw_perc,
884 count, bytes, perc);
885
886 all_ro_count += ro_count;
887 all_ro_bytes += ro_bytes;
888 all_rw_count += rw_count;
889 all_rw_bytes += rw_bytes;
890 }
891
892 int all_count = all_ro_count + all_rw_count;
893 int all_bytes = all_ro_bytes + all_rw_bytes;
894
895 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
896 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
897 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
898
899 info_stream.print_cr("%s", sep);
900 info_stream.print_cr(fmt_stats, "Total",
901 all_ro_count, all_ro_bytes, all_ro_perc,
902 all_rw_count, all_rw_bytes, all_rw_perc,
903 all_count, all_bytes, all_perc);
904
905 assert(all_ro_bytes == ro_all, "everything should have been counted");
906 assert(all_rw_bytes == rw_all, "everything should have been counted");
907
908 msg.info("%s", info_stream.as_string());
909 #undef fmt_stats
910 }
911
912 // Populate the shared space.
913
914 class VM_PopulateDumpSharedSpace: public VM_Operation {
915 private:
916 GrowableArray<MemRegion> *_string_regions;
917 GrowableArray<MemRegion> *_open_archive_heap_regions;
918
919 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
920 void dump_symbols();
921 char* dump_read_only_tables();
922 void print_region_stats();
923 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
924 const char *name, const size_t total_size);
925 public:
926
927 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
928 void doit(); // outline because gdb sucks
929 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
930 }; // class VM_PopulateDumpSharedSpace
931
932 class SortedSymbolClosure: public SymbolClosure {
933 GrowableArray<Symbol*> _symbols;
934 virtual void do_symbol(Symbol** sym) {
935 assert((*sym)->is_permanent(), "archived symbols must be permanent");
936 _symbols.append(*sym);
937 }
938 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
939 if (a[0] < b[0]) {
940 return -1;
941 } else if (a[0] == b[0]) {
942 return 0;
943 } else {
944 return 1;
945 }
946 }
947
948 public:
949 SortedSymbolClosure() {
950 SymbolTable::symbols_do(this);
951 _symbols.sort(compare_symbols_by_address);
952 }
953 GrowableArray<Symbol*>* get_sorted_symbols() {
954 return &_symbols;
955 }
956 };
957
958 // ArchiveCompactor --
959 //
960 // This class is the central piece of shared archive compaction -- all metaspace data are
961 // initially allocated outside of the shared regions. ArchiveCompactor copies the
962 // metaspace data into their final location in the shared regions.
963
964 class ArchiveCompactor : AllStatic {
965 static DumpAllocStats* _alloc_stats;
966 static SortedSymbolClosure* _ssc;
967
968 static unsigned my_hash(const address& a) {
969 return primitive_hash<address>(a);
970 }
971 static bool my_equals(const address& a0, const address& a1) {
972 return primitive_equals<address>(a0, a1);
973 }
974 typedef ResourceHashtable<
975 address, address,
976 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address>
977 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address>
978 16384, ResourceObj::C_HEAP> RelocationTable;
979 static RelocationTable* _new_loc_table;
980
981 public:
982 static void initialize() {
983 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
984 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable;
985 }
986 static DumpAllocStats* alloc_stats() {
987 return _alloc_stats;
988 }
989
990 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
991 address obj = ref->obj();
992 int bytes = ref->size() * BytesPerWord;
993 char* p;
994 size_t alignment = BytesPerWord;
995 char* oldtop;
996 char* newtop;
997
998 if (read_only) {
999 oldtop = _ro_region.top();
1000 p = _ro_region.allocate(bytes, alignment);
1001 newtop = _ro_region.top();
1002 } else {
1003 oldtop = _rw_region.top();
1004 p = _rw_region.allocate(bytes, alignment);
1005 newtop = _rw_region.top();
1006 }
1007 memcpy(p, obj, bytes);
1008 bool isnew = _new_loc_table->put(obj, (address)p);
1009 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1010 assert(isnew, "must be");
1011
1012 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1013 if (ref->msotype() == MetaspaceObj::SymbolType) {
1014 uintx delta = MetaspaceShared::object_delta(p);
1015 if (delta > MAX_SHARED_DELTA) {
1016 // This is just a sanity check and should not appear in any real world usage. This
1017 // happens only if you allocate more than 2GB of Symbols and would require
1018 // millions of shared classes.
1019 vm_exit_during_initialization("Too many Symbols in the CDS archive",
1020 "Please reduce the number of shared classes.");
1021 }
1022 }
1023 }
1024
1025 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1026 address* pp = _new_loc_table->get(ref->obj());
1027 assert(pp != NULL, "must be");
1028 return *pp;
1029 }
1030
1031 private:
1032 // Makes a shallow copy of visited MetaspaceObj's
1033 class ShallowCopier: public UniqueMetaspaceClosure {
1034 bool _read_only;
1035 public:
1036 ShallowCopier(bool read_only) : _read_only(read_only) {}
1037
1038 virtual void do_unique_ref(Ref* ref, bool read_only) {
1039 if (read_only == _read_only) {
1040 allocate(ref, read_only);
1041 }
1042 }
1043 };
1044
1045 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1046 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1047 public:
1048 virtual void do_unique_ref(Ref* ref, bool read_only) {
1049 address new_loc = get_new_loc(ref);
1050 RefRelocator refer;
1051 ref->metaspace_pointers_do_at(&refer, new_loc);
1052 }
1053 };
1054
1055 // Relocate a reference to point to its shallow copy
1056 class RefRelocator: public MetaspaceClosure {
1057 public:
1058 virtual bool do_ref(Ref* ref, bool read_only) {
1059 if (ref->not_null()) {
1060 ref->update(get_new_loc(ref));
1061 }
1062 return false; // Do not recurse.
1063 }
1064 };
1065
1066 #ifdef ASSERT
1067 class IsRefInArchiveChecker: public MetaspaceClosure {
1068 public:
1069 virtual bool do_ref(Ref* ref, bool read_only) {
1070 if (ref->not_null()) {
1071 char* obj = (char*)ref->obj();
1072 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1073 "must be relocated to point to CDS archive");
1074 }
1075 return false; // Do not recurse.
1076 }
1077 };
1078 #endif
1079
1080 public:
1081 static void copy_and_compact() {
1082 // We should no longer allocate anything from the metaspace, so that
1083 // we can have a stable set of MetaspaceObjs to work with.
1084 Metaspace::freeze();
1085
1086 ResourceMark rm;
1087 SortedSymbolClosure the_ssc; // StackObj
1088 _ssc = &the_ssc;
1089
1090 tty->print_cr("Scanning all metaspace objects ... ");
1091 {
1092 // allocate and shallow-copy RW objects, immediately following the MC region
1093 tty->print_cr("Allocating RW objects ... ");
1094 _mc_region.pack(&_rw_region);
1095
1096 ResourceMark rm;
1097 ShallowCopier rw_copier(false);
1098 iterate_roots(&rw_copier);
1099 }
1100 {
1101 // allocate and shallow-copy of RO object, immediately following the RW region
1102 tty->print_cr("Allocating RO objects ... ");
1103 _rw_region.pack(&_ro_region);
1104
1105 ResourceMark rm;
1106 ShallowCopier ro_copier(true);
1107 iterate_roots(&ro_copier);
1108 }
1109 {
1110 tty->print_cr("Relocating embedded pointers ... ");
1111 ResourceMark rm;
1112 ShallowCopyEmbeddedRefRelocator emb_reloc;
1113 iterate_roots(&emb_reloc);
1114 }
1115 {
1116 tty->print_cr("Relocating external roots ... ");
1117 ResourceMark rm;
1118 RefRelocator ext_reloc;
1119 iterate_roots(&ext_reloc);
1120 }
1121
1122 #ifdef ASSERT
1123 {
1124 tty->print_cr("Verifying external roots ... ");
1125 ResourceMark rm;
1126 IsRefInArchiveChecker checker;
1127 iterate_roots(&checker);
1128 }
1129 #endif
1130
1131
1132 // cleanup
1133 _ssc = NULL;
1134 }
1135
1136 // We must relocate the System::_well_known_klasses only after we have copied the
1137 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1138 // old objects which assert that their klass is the original klass.
1139 static void relocate_well_known_klasses() {
1140 {
1141 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
1142 ResourceMark rm;
1143 RefRelocator ext_reloc;
1144 SystemDictionary::well_known_klasses_do(&ext_reloc);
1145 }
1146 // NOTE: after this point, we shouldn't have any globals that can reach the old
1147 // objects.
1148
1149 // We cannot use any of the objects in the heap anymore (except for the objects
1150 // in the CDS shared string regions) because their headers no longer point to
1151 // valid Klasses.
1152 }
1153
1154 static void iterate_roots(MetaspaceClosure* it) {
1155 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
1156 for (int i=0; i<symbols->length(); i++) {
1157 it->push(symbols->adr_at(i));
1158 }
1159 if (_global_klass_objects != NULL) {
1160 // Need to fix up the pointers
1161 for (int i = 0; i < _global_klass_objects->length(); i++) {
1162 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1163 it->push(_global_klass_objects->adr_at(i));
1164 }
1165 }
1166 FileMapInfo::metaspace_pointers_do(it);
1167 SystemDictionary::classes_do(it);
1168 Universe::metaspace_pointers_do(it);
1169 SymbolTable::metaspace_pointers_do(it);
1170 vmSymbols::metaspace_pointers_do(it);
1171 }
1172
1173 static Klass* get_relocated_klass(Klass* orig_klass) {
1174 address* pp = _new_loc_table->get((address)orig_klass);
1175 assert(pp != NULL, "must be");
1176 Klass* klass = (Klass*)(*pp);
1177 assert(klass->is_klass(), "must be");
1178 return klass;
1179 }
1180 };
1181
1182 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1183 SortedSymbolClosure* ArchiveCompactor::_ssc;
1184 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1185
1186 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
1187 DumpRegion* dump_region, bool read_only, bool allow_exec) {
1188 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1189 }
1190
1191 void VM_PopulateDumpSharedSpace::dump_symbols() {
1192 tty->print_cr("Dumping symbol table ...");
1193
1194 NOT_PRODUCT(SymbolTable::verify());
1195 SymbolTable::write_to_archive();
1196 }
1197
1198 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1199 char* oldtop = _ro_region.top();
1200 // Reorder the system dictionary. Moving the symbols affects
1201 // how the hash table indices are calculated.
1202 SystemDictionary::reorder_dictionary_for_sharing();
1203 tty->print("Removing java_mirror ... ");
1204 remove_java_mirror_in_classes();
1205 tty->print_cr("done. ");
1206 NOT_PRODUCT(SystemDictionary::verify();)
1207
1208 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets();
1209 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t));
1210 SystemDictionary::copy_buckets(buckets_top, _ro_region.top());
1211
1212 size_t table_bytes = SystemDictionary::count_bytes_for_table();
1213 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t));
1214 SystemDictionary::copy_table(table_top, _ro_region.top());
1215
1216 // Write the other data to the output array.
1217 WriteClosure wc(&_ro_region);
1218 MetaspaceShared::serialize(&wc);
1219
1220 char* newtop = _ro_region.top();
1221 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true);
1222 return buckets_top;
1223 }
1224
1225 void VM_PopulateDumpSharedSpace::doit() {
1226 Thread* THREAD = VMThread::vm_thread();
1227
1228 NOT_PRODUCT(SystemDictionary::verify();)
1229 // The following guarantee is meant to ensure that no loader constraints
1230 // exist yet, since the constraints table is not shared. This becomes
1231 // more important now that we don't re-initialize vtables/itables for
1232 // shared classes at runtime, where constraints were previously created.
1233 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1234 "loader constraints are not saved");
1235 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1236 "placeholders are not saved");
1237 // Revisit and implement this if we prelink method handle call sites:
1238 guarantee(SystemDictionary::invoke_method_table() == NULL ||
1239 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
1240 "invoke method table is not saved");
1241
1242 // At this point, many classes have been loaded.
1243 // Gather systemDictionary classes in a global array and do everything to
1244 // that so we don't have to walk the SystemDictionary again.
1245 _global_klass_objects = new GrowableArray<Klass*>(1000);
1246 CollectClassesClosure collect_classes;
1247 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1248
1249 tty->print_cr("Number of classes %d", _global_klass_objects->length());
1250 {
1251 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1252 for (int i = 0; i < _global_klass_objects->length(); i++) {
1253 Klass* k = _global_klass_objects->at(i);
1254 if (k->is_instance_klass()) {
1255 num_inst ++;
1256 } else if (k->is_objArray_klass()) {
1257 num_obj_array ++;
1258 } else {
1259 assert(k->is_typeArray_klass(), "sanity");
1260 num_type_array ++;
1261 }
1262 }
1263 tty->print_cr(" instance classes = %5d", num_inst);
1264 tty->print_cr(" obj array classes = %5d", num_obj_array);
1265 tty->print_cr(" type array classes = %5d", num_type_array);
1266 }
1267
1268 // Ensure the ConstMethods won't be modified at run-time
1269 tty->print("Updating ConstMethods ... ");
1270 rewrite_nofast_bytecodes_and_calculate_fingerprints();
1271 tty->print_cr("done. ");
1272
1273 // Move classes from platform/system dictionaries into the boot dictionary
1274 SystemDictionary::combine_shared_dictionaries();
1275
1276 // Remove all references outside the metadata
1277 tty->print("Removing unshareable information ... ");
1278 remove_unshareable_in_classes();
1279 tty->print_cr("done. ");
1280
1281 // We don't support archiving anonymous classes. Verify that they are not stored in
1282 // the any dictionaries.
1283 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries());
1284
1285 SystemDictionaryShared::finalize_verification_constraints();
1286
1287 ArchiveCompactor::initialize();
1288 ArchiveCompactor::copy_and_compact();
1289
1290 dump_symbols();
1291
1292 // Dump supported java heap objects
1293 _string_regions = NULL;
1294 _open_archive_heap_regions = NULL;
1295 dump_java_heap_objects();
1296
1297 ArchiveCompactor::relocate_well_known_klasses();
1298
1299 char* read_only_tables_start = dump_read_only_tables();
1300 _ro_region.pack(&_md_region);
1301
1302 char* vtbl_list = _md_region.top();
1303 MetaspaceShared::allocate_cpp_vtable_clones();
1304 _md_region.pack(&_od_region);
1305
1306 // Relocate the archived class file data into the od region
1307 relocate_cached_class_file();
1308 _od_region.pack();
1309
1310 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size
1311 // is just the spaces between the two ends.
1312 size_t core_spaces_size = _od_region.end() - _mc_region.base();
1313 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
1314 "should already be aligned");
1315
1316 // During patching, some virtual methods may be called, so at this point
1317 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
1318 MetaspaceShared::patch_cpp_vtable_pointers();
1319
1320 // The vtable clones contain addresses of the current process.
1321 // We don't want to write these addresses into the archive.
1322 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1323
1324 // Create and write the archive file that maps the shared spaces.
1325
1326 FileMapInfo* mapinfo = new FileMapInfo();
1327 mapinfo->populate_header(os::vm_allocation_granularity());
1328 mapinfo->set_read_only_tables_start(read_only_tables_start);
1329 mapinfo->set_misc_data_patching_start(vtbl_list);
1330 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
1331 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
1332 mapinfo->set_core_spaces_size(core_spaces_size);
1333
1334 for (int pass=1; pass<=2; pass++) {
1335 if (pass == 1) {
1336 // The first pass doesn't actually write the data to disk. All it
1337 // does is to update the fields in the mapinfo->_header.
1338 } else {
1339 // After the first pass, the contents of mapinfo->_header are finalized,
1340 // so we can compute the header's CRC, and write the contents of the header
1341 // and the regions into disk.
1342 mapinfo->open_for_write();
1343 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1344 }
1345 mapinfo->write_header();
1346
1347 // NOTE: md contains the trampoline code for method entries, which are patched at run time,
1348 // so it needs to be read/write.
1349 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1350 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1351 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1352 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
1353 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false);
1354
1355 _total_string_region_size = mapinfo->write_archive_heap_regions(
1356 _string_regions,
1357 MetaspaceShared::first_string,
1358 MetaspaceShared::max_strings);
1359 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1360 _open_archive_heap_regions,
1361 MetaspaceShared::first_open_archive_heap_region,
1362 MetaspaceShared::max_open_archive_heap_region);
1363 }
1364
1365 mapinfo->close();
1366
1367 // Restore the vtable in case we invoke any virtual methods.
1368 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
1369
1370 print_region_stats();
1371
1372 if (log_is_enabled(Info, cds)) {
1373 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1374 int(_mc_region.used()), int(_md_region.used()));
1375 }
1376
1377 if (PrintSystemDictionaryAtExit) {
1378 SystemDictionary::print();
1379 }
1380 // There may be other pending VM operations that operate on the InstanceKlasses,
1381 // which will fail because InstanceKlasses::remove_unshareable_info()
1382 // has been called. Forget these operations and exit the VM directly.
1383 vm_direct_exit(0);
1384 }
1385
1386 void VM_PopulateDumpSharedSpace::print_region_stats() {
1387 // Print statistics of all the regions
1388 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1389 _mc_region.reserved() + _md_region.reserved() +
1390 _od_region.reserved() +
1391 _total_string_region_size +
1392 _total_open_archive_region_size;
1393 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1394 _mc_region.used() + _md_region.used() +
1395 _od_region.used() +
1396 _total_string_region_size +
1397 _total_open_archive_region_size;
1398 const double total_u_perc = total_bytes / double(total_reserved) * 100.0;
1399
1400 _mc_region.print(total_reserved);
1401 _rw_region.print(total_reserved);
1402 _ro_region.print(total_reserved);
1403 _md_region.print(total_reserved);
1404 _od_region.print(total_reserved);
1405 print_heap_region_stats(_string_regions, "st", total_reserved);
1406 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1407
1408 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1409 total_bytes, total_reserved, total_u_perc);
1410 }
1411
1412 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1413 const char *name, const size_t total_size) {
1414 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1415 for (int i = 0; i < arr_len; i++) {
1416 char* start = (char*)heap_mem->at(i).start();
1417 size_t size = heap_mem->at(i).byte_size();
1418 char* top = start + size;
1419 tty->print_cr("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100%% used] at " INTPTR_FORMAT,
1420 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1421
1422 }
1423 }
1424
1425 // Update a Java object to point its Klass* to the new location after
1426 // shared archive has been compacted.
1427 void MetaspaceShared::relocate_klass_ptr(oop o) {
1428 assert(DumpSharedSpaces, "sanity");
1429 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1430 o->set_klass(k);
1431 }
1432
1433 class LinkSharedClassesClosure : public KlassClosure {
1434 Thread* THREAD;
1435 bool _made_progress;
1436 public:
1437 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1438
1439 void reset() { _made_progress = false; }
1440 bool made_progress() const { return _made_progress; }
1441
1442 void do_klass(Klass* k) {
1443 if (k->is_instance_klass()) {
1444 InstanceKlass* ik = InstanceKlass::cast(k);
1445 // Link the class to cause the bytecodes to be rewritten and the
1446 // cpcache to be created. Class verification is done according
1447 // to -Xverify setting.
1448 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1449 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1450
1451 ik->constants()->resolve_class_constants(THREAD);
1452 }
1453 }
1454 };
1455
1456 class CheckSharedClassesClosure : public KlassClosure {
1457 bool _made_progress;
1458 public:
1459 CheckSharedClassesClosure() : _made_progress(false) {}
1460
1461 void reset() { _made_progress = false; }
1462 bool made_progress() const { return _made_progress; }
1463 void do_klass(Klass* k) {
1464 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
1465 _made_progress = true;
1466 }
1467 }
1468 };
1469
1470 void MetaspaceShared::check_shared_class_loader_type(Klass* k) {
1471 if (k->is_instance_klass()) {
1472 InstanceKlass* ik = InstanceKlass::cast(k);
1473 u2 loader_type = ik->loader_type();
1474 ResourceMark rm;
1475 guarantee(loader_type != 0,
1476 "Class loader type is not set for this class %s", ik->name()->as_C_string());
1477 }
1478 }
1479
1480 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1481 // We need to iterate because verification may cause additional classes
1482 // to be loaded.
1483 LinkSharedClassesClosure link_closure(THREAD);
1484 do {
1485 link_closure.reset();
1486 ClassLoaderDataGraph::loaded_classes_do(&link_closure);
1487 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1488 } while (link_closure.made_progress());
1489
1490 if (_has_error_classes) {
1491 // Mark all classes whose super class or interfaces failed verification.
1492 CheckSharedClassesClosure check_closure;
1493 do {
1494 // Not completely sure if we need to do this iteratively. Anyway,
1495 // we should come here only if there are unverifiable classes, which
1496 // shouldn't happen in normal cases. So better safe than sorry.
1497 check_closure.reset();
1498 ClassLoaderDataGraph::loaded_classes_do(&check_closure);
1499 } while (check_closure.made_progress());
1500
1501 if (IgnoreUnverifiableClassesDuringDump) {
1502 // This is useful when running JCK or SQE tests. You should not
1503 // enable this when running real apps.
1504 SystemDictionary::remove_classes_in_error_state();
1505 } else {
1506 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
1507 exit(1);
1508 }
1509 }
1510 }
1511
1512 void MetaspaceShared::prepare_for_dumping() {
1513 Arguments::check_unsupported_dumping_properties();
1514 ClassLoader::initialize_shared_path();
1515 FileMapInfo::allocate_classpath_entry_table();
1516 }
1517
1518 // Preload classes from a list, populate the shared spaces and dump to a
1519 // file.
1520 void MetaspaceShared::preload_and_dump(TRAPS) {
1521 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1522 ResourceMark rm;
1523 char class_list_path_str[JVM_MAXPATHLEN];
1524 // Preload classes to be shared.
1525 // Should use some os:: method rather than fopen() here. aB.
1526 const char* class_list_path;
1527 if (SharedClassListFile == NULL) {
1528 // Construct the path to the class list (in jre/lib)
1529 // Walk up two directories from the location of the VM and
1530 // optionally tack on "lib" (depending on platform)
1531 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1532 for (int i = 0; i < 3; i++) {
1533 char *end = strrchr(class_list_path_str, *os::file_separator());
1534 if (end != NULL) *end = '\0';
1535 }
1536 int class_list_path_len = (int)strlen(class_list_path_str);
1537 if (class_list_path_len >= 3) {
1538 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1539 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1540 jio_snprintf(class_list_path_str + class_list_path_len,
1541 sizeof(class_list_path_str) - class_list_path_len,
1542 "%slib", os::file_separator());
1543 class_list_path_len += 4;
1544 }
1545 }
1546 }
1547 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1548 jio_snprintf(class_list_path_str + class_list_path_len,
1549 sizeof(class_list_path_str) - class_list_path_len,
1550 "%sclasslist", os::file_separator());
1551 }
1552 class_list_path = class_list_path_str;
1553 } else {
1554 class_list_path = SharedClassListFile;
1555 }
1556
1557 tty->print_cr("Loading classes to share ...");
1558 _has_error_classes = false;
1559 int class_count = preload_classes(class_list_path, THREAD);
1560 if (ExtraSharedClassListFile) {
1561 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1562 }
1563 tty->print_cr("Loading classes to share: done.");
1564
1565 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1566
1567 // Rewrite and link classes
1568 tty->print_cr("Rewriting and linking classes ...");
1569
1570 // Link any classes which got missed. This would happen if we have loaded classes that
1571 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1572 // fails verification, all other interfaces that were not specified in the classlist but
1573 // are implemented by K are not verified.
1574 link_and_cleanup_shared_classes(CATCH);
1575 tty->print_cr("Rewriting and linking classes: done");
1576
1577 SystemDictionary::clear_invoke_method_table();
1578
1579 VM_PopulateDumpSharedSpace op;
1580 VMThread::execute(&op);
1581 }
1582 }
1583
1584
1585 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1586 ClassListParser parser(class_list_path);
1587 int class_count = 0;
1588
1589 while (parser.parse_one_line()) {
1590 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
1591 if (HAS_PENDING_EXCEPTION) {
1592 if (klass == NULL &&
1593 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1594 // print a warning only when the pending exception is class not found
1595 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
1596 }
1597 CLEAR_PENDING_EXCEPTION;
1598 }
1599 if (klass != NULL) {
1600 if (log_is_enabled(Trace, cds)) {
1601 ResourceMark rm;
1602 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
1603 }
1604
1605 InstanceKlass* ik = InstanceKlass::cast(klass);
1606
1607 // Link the class to cause the bytecodes to be rewritten and the
1608 // cpcache to be created. The linking is done as soon as classes
1609 // are loaded in order that the related data structures (klass and
1610 // cpCache) are located together.
1611 try_link_class(ik, THREAD);
1612 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1613
1614 class_count++;
1615 }
1616 }
1617
1618 return class_count;
1619 }
1620
1621 // Returns true if the class's status has changed
1622 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
1623 assert(DumpSharedSpaces, "should only be called during dumping");
1624 if (ik->init_state() < InstanceKlass::linked) {
1625 bool saved = BytecodeVerificationLocal;
1626 if (!(ik->is_shared_boot_class())) {
1627 // The verification decision is based on BytecodeVerificationRemote
1628 // for non-system classes. Since we are using the NULL classloader
1629 // to load non-system classes during dumping, we need to temporarily
1630 // change BytecodeVerificationLocal to be the same as
1631 // BytecodeVerificationRemote. Note this can cause the parent system
1632 // classes also being verified. The extra overhead is acceptable during
1633 // dumping.
1634 BytecodeVerificationLocal = BytecodeVerificationRemote;
1635 }
1636 ik->link_class(THREAD);
1637 if (HAS_PENDING_EXCEPTION) {
1638 ResourceMark rm;
1639 tty->print_cr("Preload Warning: Verification failed for %s",
1640 ik->external_name());
1641 CLEAR_PENDING_EXCEPTION;
1642 ik->set_in_error_state();
1643 _has_error_classes = true;
1644 }
1645 BytecodeVerificationLocal = saved;
1646 return true;
1647 } else {
1648 return false;
1649 }
1650 }
1651
1652 #if INCLUDE_CDS_JAVA_HEAP
1653 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1654 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
1655 if (log_is_enabled(Info, cds)) {
1656 log_info(cds)(
1657 "Archived java heap is not supported as UseG1GC, "
1658 "UseCompressedOops and UseCompressedClassPointers are required."
1659 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.",
1660 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
1661 BOOL_TO_STR(UseCompressedClassPointers));
1662 }
1663 return;
1664 }
1665
1666 {
1667 NoSafepointVerifier nsv;
1668
1669 // Cache for recording where the archived objects are copied to
1670 MetaspaceShared::create_archive_object_cache();
1671
1672 tty->print_cr("Dumping String objects to closed archive heap region ...");
1673 NOT_PRODUCT(StringTable::verify());
1674 // The string space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details.
1675 _string_regions = new GrowableArray<MemRegion>(2);
1676 StringTable::write_to_archive(_string_regions);
1677
1678 tty->print_cr("Dumping objects to open archive heap region ...");
1679 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
1680 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions);
1681
1682 MetaspaceShared::destroy_archive_object_cache();
1683 }
1684
1685 G1HeapVerifier::verify_archive_regions();
1686 }
1687
1688 void MetaspaceShared::dump_open_archive_heap_objects(
1689 GrowableArray<MemRegion> * open_archive) {
1690 assert(UseG1GC, "Only support G1 GC");
1691 assert(UseCompressedOops && UseCompressedClassPointers,
1692 "Only support UseCompressedOops and UseCompressedClassPointers enabled");
1693
1694 Thread* THREAD = Thread::current();
1695 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */);
1696
1697 MetaspaceShared::archive_resolved_constants(THREAD);
1698
1699 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive,
1700 os::vm_allocation_granularity());
1701 }
1702
1703 MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL;
1704 oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) {
1705 assert(DumpSharedSpaces, "dump-time only");
1706
1707 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
1708 oop* p = cache->get(obj);
1709 if (p != NULL) {
1710 // already archived
1711 return *p;
1712 }
1713
1714 int len = obj->size();
1715 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
1716 return NULL;
1717 }
1718
1719 int hash = obj->identity_hash();
1720 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len);
1721 if (archived_oop != NULL) {
1722 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len);
1723 relocate_klass_ptr(archived_oop);
1724 cache->put(obj, archived_oop);
1725 }
1726 return archived_oop;
1727 }
1728
1729 void MetaspaceShared::archive_resolved_constants(Thread* THREAD) {
1730 int i;
1731 for (i = 0; i < _global_klass_objects->length(); i++) {
1732 Klass* k = _global_klass_objects->at(i);
1733 if (k->is_instance_klass()) {
1734 InstanceKlass* ik = InstanceKlass::cast(k);
1735 ik->constants()->archive_resolved_references(THREAD);
1736 }
1737 }
1738 }
1739
1740 void MetaspaceShared::fixup_mapped_heap_regions() {
1741 FileMapInfo *mapinfo = FileMapInfo::current_info();
1742 mapinfo->fixup_mapped_heap_regions();
1743 }
1744 #endif // INCLUDE_CDS_JAVA_HEAP
1745
1746 // Closure for serializing initialization data in from a data area
1747 // (ptr_array) read from the shared file.
1748
1749 class ReadClosure : public SerializeClosure {
1750 private:
1751 intptr_t** _ptr_array;
1752
1753 inline intptr_t nextPtr() {
1754 return *(*_ptr_array)++;
1755 }
1756
1757 public:
1758 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
1759
1760 void do_ptr(void** p) {
1761 assert(*p == NULL, "initializing previous initialized pointer.");
1762 intptr_t obj = nextPtr();
1763 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1764 "hit tag while initializing ptrs.");
1765 *p = (void*)obj;
1766 }
1767
1768 void do_u4(u4* p) {
1769 intptr_t obj = nextPtr();
1770 *p = (u4)(uintx(obj));
1771 }
1772
1773 void do_tag(int tag) {
1774 int old_tag;
1775 old_tag = (int)(intptr_t)nextPtr();
1776 // do_int(&old_tag);
1777 assert(tag == old_tag, "old tag doesn't match");
1778 FileMapInfo::assert_mark(tag == old_tag);
1779 }
1780
1781 void do_region(u_char* start, size_t size) {
1782 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1783 assert(size % sizeof(intptr_t) == 0, "bad size");
1784 do_tag((int)size);
1785 while (size > 0) {
1786 *(intptr_t*)start = nextPtr();
1787 start += sizeof(intptr_t);
1788 size -= sizeof(intptr_t);
1789 }
1790 }
1791
1792 bool reading() const { return true; }
1793 };
1794
1795 // Return true if given address is in the mapped shared space.
1796 bool MetaspaceShared::is_in_shared_space(const void* p) {
1797 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
1798 }
1799
1800 // Return true if given address is in the misc data region
1801 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
1802 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
1803 }
1804
1805 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
1806 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
1807 return true;
1808 }
1809 return false;
1810 }
1811
1812 void MetaspaceShared::print_shared_spaces() {
1813 if (UseSharedSpaces) {
1814 FileMapInfo::current_info()->print_shared_spaces();
1815 }
1816 }
1817
1818
1819 // Map shared spaces at requested addresses and return if succeeded.
1820 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1821 size_t image_alignment = mapinfo->alignment();
1822
1823 #ifndef _WINDOWS
1824 // Map in the shared memory and then map the regions on top of it.
1825 // On Windows, don't map the memory here because it will cause the
1826 // mappings of the regions to fail.
1827 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
1828 if (!shared_rs.is_reserved()) return false;
1829 #endif
1830
1831 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
1832
1833 char* _ro_base = NULL;
1834 char* _rw_base = NULL;
1835 char* _mc_base = NULL;
1836 char* _md_base = NULL;
1837 char* _od_base = NULL;
1838
1839 // Map each shared region
1840 if ((_mc_base = mapinfo->map_region(mc)) != NULL &&
1841 mapinfo->verify_region_checksum(mc) &&
1842 (_rw_base = mapinfo->map_region(rw)) != NULL &&
1843 mapinfo->verify_region_checksum(rw) &&
1844 (_ro_base = mapinfo->map_region(ro)) != NULL &&
1845 mapinfo->verify_region_checksum(ro) &&
1846 (_md_base = mapinfo->map_region(md)) != NULL &&
1847 mapinfo->verify_region_checksum(md) &&
1848 (_od_base = mapinfo->map_region(od)) != NULL &&
1849 mapinfo->verify_region_checksum(od) &&
1850 (image_alignment == (size_t)os::vm_allocation_granularity()) &&
1851 mapinfo->validate_classpath_entry_table()) {
1852 // Success (no need to do anything)
1853 return true;
1854 } else {
1855 // If there was a failure in mapping any of the spaces, unmap the ones
1856 // that succeeded
1857 if (_ro_base != NULL) mapinfo->unmap_region(ro);
1858 if (_rw_base != NULL) mapinfo->unmap_region(rw);
1859 if (_mc_base != NULL) mapinfo->unmap_region(mc);
1860 if (_md_base != NULL) mapinfo->unmap_region(md);
1861 if (_od_base != NULL) mapinfo->unmap_region(od);
1862 #ifndef _WINDOWS
1863 // Release the entire mapped region
1864 shared_rs.release();
1865 #endif
1866 // If -Xshare:on is specified, print out the error message and exit VM,
1867 // otherwise, set UseSharedSpaces to false and continue.
1868 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1869 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1870 } else {
1871 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1872 }
1873 return false;
1874 }
1875 }
1876
1877 // Read the miscellaneous data from the shared file, and
1878 // serialize it out to its various destinations.
1879
1880 void MetaspaceShared::initialize_shared_spaces() {
1881 FileMapInfo *mapinfo = FileMapInfo::current_info();
1882 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
1883 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
1884 _core_spaces_size = mapinfo->core_spaces_size();
1885 char* buffer = mapinfo->misc_data_patching_start();
1886 clone_cpp_vtables((intptr_t*)buffer);
1887
1888 // The rest of the data is now stored in the RW region
1889 buffer = mapinfo->read_only_tables_start();
1890 int sharedDictionaryLen = *(intptr_t*)buffer;
1891 buffer += sizeof(intptr_t);
1892 int number_of_entries = *(intptr_t*)buffer;
1893 buffer += sizeof(intptr_t);
1894 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
1895 sharedDictionaryLen,
1896 number_of_entries);
1897 buffer += sharedDictionaryLen;
1898
1899 // The following data are the linked list elements
1900 // (HashtableEntry objects) for the shared dictionary table.
1901
1902 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
1903 buffer += sizeof(intptr_t);
1904 buffer += len;
1905
1906 // Verify various attributes of the archive, plus initialize the
1907 // shared string/symbol tables
1908 intptr_t* array = (intptr_t*)buffer;
1909 ReadClosure rc(&array);
1910 serialize(&rc);
1911
1912 // Initialize the run-time symbol table.
1913 SymbolTable::create_table();
1914
1915 // Close the mapinfo file
1916 mapinfo->close();
1917
1918 if (PrintSharedArchiveAndExit) {
1919 if (PrintSharedDictionary) {
1920 tty->print_cr("\nShared classes:\n");
1921 SystemDictionary::print_shared(tty);
1922 }
1923 if (_archive_loading_failed) {
1924 tty->print_cr("archive is invalid");
1925 vm_exit(1);
1926 } else {
1927 tty->print_cr("archive is valid");
1928 vm_exit(0);
1929 }
1930 }
1931 }
1932
1933 // JVM/TI RedefineClasses() support:
1934 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1935 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1936
1937 if (UseSharedSpaces) {
1938 // remap the shared readonly space to shared readwrite, private
1939 FileMapInfo* mapinfo = FileMapInfo::current_info();
1940 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1941 return false;
1942 }
1943 _remapped_readwrite = true;
1944 }
1945 return true;
1946 }
1947
1948 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
1949 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1950 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1951 // or so.
1952 _mc_region.print_out_of_space_msg(name, needed_bytes);
1953 _rw_region.print_out_of_space_msg(name, needed_bytes);
1954 _ro_region.print_out_of_space_msg(name, needed_bytes);
1955 _md_region.print_out_of_space_msg(name, needed_bytes);
1956 _od_region.print_out_of_space_msg(name, needed_bytes);
1957
1958 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
1959 "Please reduce the number of shared classes.");
1960 }