1 /*
2 * Copyright (c) 2020, 2023, 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 "cds/archiveBuilder.hpp"
27 #include "cds/archiveHeapWriter.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/cppVtables.hpp"
31 #include "cds/dumpAllocStats.hpp"
32 #include "cds/dynamicArchive.hpp"
33 #include "cds/heapShared.hpp"
34 #include "cds/metaspaceShared.hpp"
35 #include "cds/regeneratedClasses.hpp"
36 #include "classfile/classLoaderDataShared.hpp"
37 #include "classfile/javaClasses.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "interpreter/abstractInterpreter.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allStatic.hpp"
45 #include "memory/memRegion.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "oops/compressedKlass.inline.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oopHandle.inline.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/fieldDescriptor.inline.hpp"
54 #include "runtime/globals_extension.hpp"
55 #include "runtime/javaThread.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/bitMap.inline.hpp"
59 #include "utilities/formatBuffer.hpp"
60
61 ArchiveBuilder* ArchiveBuilder::_current = nullptr;
62
63 ArchiveBuilder::OtherROAllocMark::~OtherROAllocMark() {
64 char* newtop = ArchiveBuilder::current()->_ro_region.top();
65 ArchiveBuilder::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
66 }
67
68 ArchiveBuilder::SourceObjList::SourceObjList() : _ptrmap(16 * K, mtClassShared) {
69 _total_bytes = 0;
70 _objs = new (mtClassShared) GrowableArray<SourceObjInfo*>(128 * K, mtClassShared);
71 }
72
73 ArchiveBuilder::SourceObjList::~SourceObjList() {
74 delete _objs;
75 }
76
77 void ArchiveBuilder::SourceObjList::append(SourceObjInfo* src_info) {
78 // Save this source object for copying
79 _objs->append(src_info);
80
81 // Prepare for marking the pointers in this source object
82 assert(is_aligned(_total_bytes, sizeof(address)), "must be");
83 src_info->set_ptrmap_start(_total_bytes / sizeof(address));
84 _total_bytes = align_up(_total_bytes + (uintx)src_info->size_in_bytes(), sizeof(address));
85 src_info->set_ptrmap_end(_total_bytes / sizeof(address));
86
87 BitMap::idx_t bitmap_size_needed = BitMap::idx_t(src_info->ptrmap_end());
88 if (_ptrmap.size() <= bitmap_size_needed) {
89 _ptrmap.resize((bitmap_size_needed + 1) * 2);
90 }
91 }
92
93 void ArchiveBuilder::SourceObjList::remember_embedded_pointer(SourceObjInfo* src_info, MetaspaceClosure::Ref* ref) {
94 // src_obj contains a pointer. Remember the location of this pointer in _ptrmap,
95 // so that we can copy/relocate it later.
96 address src_obj = src_info->source_addr();
97 address* field_addr = ref->addr();
98 assert(src_info->ptrmap_start() < _total_bytes, "sanity");
99 assert(src_info->ptrmap_end() <= _total_bytes, "sanity");
100 assert(*field_addr != nullptr, "should have checked");
101
102 intx field_offset_in_bytes = ((address)field_addr) - src_obj;
103 DEBUG_ONLY(int src_obj_size = src_info->size_in_bytes();)
104 assert(field_offset_in_bytes >= 0, "must be");
105 assert(field_offset_in_bytes + intx(sizeof(intptr_t)) <= intx(src_obj_size), "must be");
106 assert(is_aligned(field_offset_in_bytes, sizeof(address)), "must be");
107
108 BitMap::idx_t idx = BitMap::idx_t(src_info->ptrmap_start() + (uintx)(field_offset_in_bytes / sizeof(address)));
109 _ptrmap.set_bit(BitMap::idx_t(idx));
110 }
111
112 class RelocateEmbeddedPointers : public BitMapClosure {
113 ArchiveBuilder* _builder;
114 address _buffered_obj;
115 BitMap::idx_t _start_idx;
116 public:
117 RelocateEmbeddedPointers(ArchiveBuilder* builder, address buffered_obj, BitMap::idx_t start_idx) :
118 _builder(builder), _buffered_obj(buffered_obj), _start_idx(start_idx) {}
119
120 bool do_bit(BitMap::idx_t bit_offset) {
121 size_t field_offset = size_t(bit_offset - _start_idx) * sizeof(address);
122 address* ptr_loc = (address*)(_buffered_obj + field_offset);
123
124 address old_p = *ptr_loc;
125 address new_p = _builder->get_buffered_addr(old_p);
126
127 log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
128 p2i(ptr_loc), p2i(old_p), p2i(new_p));
129
130 ArchivePtrMarker::set_and_mark_pointer(ptr_loc, new_p);
131 return true; // keep iterating the bitmap
132 }
133 };
134
135 void ArchiveBuilder::SourceObjList::relocate(int i, ArchiveBuilder* builder) {
136 SourceObjInfo* src_info = objs()->at(i);
137 assert(src_info->should_copy(), "must be");
138 BitMap::idx_t start = BitMap::idx_t(src_info->ptrmap_start()); // inclusive
139 BitMap::idx_t end = BitMap::idx_t(src_info->ptrmap_end()); // exclusive
140
141 RelocateEmbeddedPointers relocator(builder, src_info->buffered_addr(), start);
142 _ptrmap.iterate(&relocator, start, end);
143 }
144
145 ArchiveBuilder::ArchiveBuilder() :
146 _current_dump_space(nullptr),
147 _buffer_bottom(nullptr),
148 _last_verified_top(nullptr),
149 _num_dump_regions_used(0),
150 _other_region_used_bytes(0),
151 _requested_static_archive_bottom(nullptr),
152 _requested_static_archive_top(nullptr),
153 _requested_dynamic_archive_bottom(nullptr),
154 _requested_dynamic_archive_top(nullptr),
155 _mapped_static_archive_bottom(nullptr),
156 _mapped_static_archive_top(nullptr),
157 _buffer_to_requested_delta(0),
158 _rw_region("rw", MAX_SHARED_DELTA),
159 _ro_region("ro", MAX_SHARED_DELTA),
160 _ptrmap(mtClassShared),
161 _rw_src_objs(),
162 _ro_src_objs(),
163 _src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
164 _buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
165 _total_heap_region_size(0),
166 _estimated_metaspaceobj_bytes(0),
167 _estimated_hashtable_bytes(0)
168 {
169 _klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
170 _symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
171
172 assert(_current == nullptr, "must be");
173 _current = this;
174 }
175
176 ArchiveBuilder::~ArchiveBuilder() {
177 assert(_current == this, "must be");
178 _current = nullptr;
179
180 for (int i = 0; i < _symbols->length(); i++) {
181 _symbols->at(i)->decrement_refcount();
182 }
183
184 delete _klasses;
185 delete _symbols;
186 if (_shared_rs.is_reserved()) {
187 _shared_rs.release();
188 }
189 }
190
191 class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
192 ArchiveBuilder* _builder;
193
194 public:
195 GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
196
197 virtual bool do_unique_ref(Ref* ref, bool read_only) {
198 return _builder->gather_klass_and_symbol(ref, read_only);
199 }
200 };
201
202 bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
203 if (ref->obj() == nullptr) {
204 return false;
205 }
206 if (get_follow_mode(ref) != make_a_copy) {
207 return false;
208 }
209 if (ref->msotype() == MetaspaceObj::ClassType) {
210 Klass* klass = (Klass*)ref->obj();
211 assert(klass->is_klass(), "must be");
212 if (!is_excluded(klass)) {
213 _klasses->append(klass);
214 }
215 // See RunTimeClassInfo::get_for()
216 _estimated_metaspaceobj_bytes += align_up(BytesPerWord, SharedSpaceObjectAlignment);
217 } else if (ref->msotype() == MetaspaceObj::SymbolType) {
218 // Make sure the symbol won't be GC'ed while we are dumping the archive.
219 Symbol* sym = (Symbol*)ref->obj();
220 sym->increment_refcount();
221 _symbols->append(sym);
222 }
223
224 int bytes = ref->size() * BytesPerWord;
225 _estimated_metaspaceobj_bytes += align_up(bytes, SharedSpaceObjectAlignment);
226
227 return true; // recurse
228 }
229
230 void ArchiveBuilder::gather_klasses_and_symbols() {
231 ResourceMark rm;
232 log_info(cds)("Gathering classes and symbols ... ");
233 GatherKlassesAndSymbols doit(this);
234 iterate_roots(&doit);
235 #if INCLUDE_CDS_JAVA_HEAP
236 if (CDSConfig::is_dumping_full_module_graph()) {
237 ClassLoaderDataShared::iterate_symbols(&doit);
238 }
239 #endif
240 doit.finish();
241
242 if (CDSConfig::is_dumping_static_archive()) {
243 // To ensure deterministic contents in the static archive, we need to ensure that
244 // we iterate the MetaspaceObjs in a deterministic order. It doesn't matter where
245 // the MetaspaceObjs are located originally, as they are copied sequentially into
246 // the archive during the iteration.
247 //
248 // The only issue here is that the symbol table and the system directories may be
249 // randomly ordered, so we copy the symbols and klasses into two arrays and sort
250 // them deterministically.
251 //
252 // During -Xshare:dump, the order of Symbol creation is strictly determined by
253 // the SharedClassListFile (class loading is done in a single thread and the JIT
254 // is disabled). Also, Symbols are allocated in monotonically increasing addresses
255 // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
256 // ascending address order, we ensure that all Symbols are copied into deterministic
257 // locations in the archive.
258 //
259 // TODO: in the future, if we want to produce deterministic contents in the
260 // dynamic archive, we might need to sort the symbols alphabetically (also see
261 // DynamicArchiveBuilder::sort_methods()).
262 log_info(cds)("Sorting symbols ... ");
263 _symbols->sort(compare_symbols_by_address);
264 sort_klasses();
265
266 // TODO -- we need a proper estimate for the archived modules, etc,
267 // but this should be enough for now
268 _estimated_metaspaceobj_bytes += 200 * 1024 * 1024;
269 }
270 }
271
272 int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
273 if (a[0] < b[0]) {
274 return -1;
275 } else {
276 assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
277 return 1;
278 }
279 }
280
281 int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
282 return a[0]->name()->fast_compare(b[0]->name());
283 }
284
285 void ArchiveBuilder::sort_klasses() {
286 log_info(cds)("Sorting classes ... ");
287 _klasses->sort(compare_klass_by_name);
288 }
289
290 size_t ArchiveBuilder::estimate_archive_size() {
291 // size of the symbol table and two dictionaries, plus the RunTimeClassInfo's
292 size_t symbol_table_est = SymbolTable::estimate_size_for_archive();
293 size_t dictionary_est = SystemDictionaryShared::estimate_size_for_archive();
294 _estimated_hashtable_bytes = symbol_table_est + dictionary_est;
295
296 size_t total = 0;
297
298 total += _estimated_metaspaceobj_bytes;
299 total += _estimated_hashtable_bytes;
300
301 // allow fragmentation at the end of each dump region
302 total += _total_dump_regions * MetaspaceShared::core_region_alignment();
303
304 log_info(cds)("_estimated_hashtable_bytes = " SIZE_FORMAT " + " SIZE_FORMAT " = " SIZE_FORMAT,
305 symbol_table_est, dictionary_est, _estimated_hashtable_bytes);
306 log_info(cds)("_estimated_metaspaceobj_bytes = " SIZE_FORMAT, _estimated_metaspaceobj_bytes);
307 log_info(cds)("total estimate bytes = " SIZE_FORMAT, total);
308
309 return align_up(total, MetaspaceShared::core_region_alignment());
310 }
311
312 address ArchiveBuilder::reserve_buffer() {
313 size_t buffer_size = estimate_archive_size();
314 ReservedSpace rs(buffer_size, MetaspaceShared::core_region_alignment(), os::vm_page_size());
315 if (!rs.is_reserved()) {
316 log_error(cds)("Failed to reserve " SIZE_FORMAT " bytes of output buffer.", buffer_size);
317 MetaspaceShared::unrecoverable_writing_error();
318 }
319
320 // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
321 // we are copying the class metadata into the buffer.
322 address buffer_bottom = (address)rs.base();
323 log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [" SIZE_FORMAT " bytes]",
324 p2i(buffer_bottom), buffer_size);
325 _shared_rs = rs;
326
327 _buffer_bottom = buffer_bottom;
328 _last_verified_top = buffer_bottom;
329 _current_dump_space = &_rw_region;
330 _num_dump_regions_used = 1;
331 _other_region_used_bytes = 0;
332 _current_dump_space->init(&_shared_rs, &_shared_vs);
333
334 ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
335
336 // The bottom of the static archive should be mapped at this address by default.
337 _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
338
339 // The bottom of the archive (that I am writing now) should be mapped at this address by default.
340 address my_archive_requested_bottom;
341
342 if (CDSConfig::is_dumping_static_archive()) {
343 my_archive_requested_bottom = _requested_static_archive_bottom;
344 } else {
345 _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
346 _mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
347 assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
348 size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
349
350 // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
351 _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
352 my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
353
354 _requested_dynamic_archive_bottom = my_archive_requested_bottom;
355 }
356
357 _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
358
359 address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
360 if (my_archive_requested_bottom < _requested_static_archive_bottom ||
361 my_archive_requested_top <= _requested_static_archive_bottom) {
362 // Size overflow.
363 log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
364 log_error(cds)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
365 log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
366 "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
367 MetaspaceShared::unrecoverable_writing_error();
368 }
369
370 if (CDSConfig::is_dumping_static_archive()) {
371 // We don't want any valid object to be at the very bottom of the archive.
372 // See ArchivePtrMarker::mark_pointer().
373 rw_region()->allocate(16);
374 }
375
376 return buffer_bottom;
377 }
378
379 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
380 int num_symbols = _symbols->length();
381 for (int i = 0; i < num_symbols; i++) {
382 it->push(_symbols->adr_at(i));
383 }
384
385 int num_klasses = _klasses->length();
386 for (int i = 0; i < num_klasses; i++) {
387 it->push(_klasses->adr_at(i));
388 }
389
390 iterate_roots(it);
391 }
392
393 class GatherSortedSourceObjs : public MetaspaceClosure {
394 ArchiveBuilder* _builder;
395
396 public:
397 GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
398
399 virtual bool do_ref(Ref* ref, bool read_only) {
400 return _builder->gather_one_source_obj(ref, read_only);
401 }
402 };
403
404 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
405 address src_obj = ref->obj();
406 if (src_obj == nullptr) {
407 return false;
408 }
409 if (RegeneratedClasses::has_been_regenerated(src_obj)) {
410 // No need to copy it. We will later relocate it to point to the regenerated klass/method.
411 return false;
412 }
413 remember_embedded_pointer_in_enclosing_obj(ref);
414
415 FollowMode follow_mode = get_follow_mode(ref);
416 SourceObjInfo src_info(ref, read_only, follow_mode);
417 bool created;
418 SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
419 if (created) {
420 if (_src_obj_table.maybe_grow()) {
421 log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
422 }
423 }
424
425 #ifdef ASSERT
426 if (ref->msotype() == MetaspaceObj::MethodType) {
427 Method* m = (Method*)ref->obj();
428 assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
429 "Should not archive methods in a class that has been regenerated");
430 }
431 #endif
432
433 assert(p->read_only() == src_info.read_only(), "must be");
434
435 if (created && src_info.should_copy()) {
436 if (read_only) {
437 _ro_src_objs.append(p);
438 } else {
439 _rw_src_objs.append(p);
440 }
441 return true; // Need to recurse into this ref only if we are copying it
442 } else {
443 return false;
444 }
445 }
446
447 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
448 // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
449 // should return the same value as get_buffered_addr(regen_src_obj).
450 SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
451 assert(p != nullptr, "regenerated object should always be dumped");
452 SourceObjInfo orig_src_info(orig_src_obj, p);
453 bool created;
454 _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
455 assert(created, "We shouldn't have archived the original copy of a regenerated object");
456 }
457
458 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
459 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
460 assert(ref->obj() != nullptr, "should have checked");
461
462 address enclosing_obj = ref->enclosing_obj();
463 if (enclosing_obj == nullptr) {
464 return;
465 }
466
467 // We are dealing with 3 addresses:
468 // address o = ref->obj(): We have found an object whose address is o.
469 // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
470 // I.e., (*mpp == o)
471 // enclosing_obj : If non-null, it is the object which has a field that points to o.
472 // mpp is the address if that field.
473 //
474 // Example: We have an array whose first element points to a Method:
475 // Method* o = 0x0000abcd;
476 // Array<Method*>* enclosing_obj = 0x00001000;
477 // enclosing_obj->at_put(0, o);
478 //
479 // We the MetaspaceClosure iterates on the very first element of this array, we have
480 // ref->obj() == 0x0000abcd (the Method)
481 // ref->mpp() == 0x00001008 (the location of the first element in the array)
482 // ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
483 //
484 // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
485 SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
486 if (src_info == nullptr || !src_info->should_copy()) {
487 // source objects of point_to_it/set_to_null types are not copied
488 // so we don't need to remember their pointers.
489 } else {
490 if (src_info->read_only()) {
491 _ro_src_objs.remember_embedded_pointer(src_info, ref);
492 } else {
493 _rw_src_objs.remember_embedded_pointer(src_info, ref);
494 }
495 }
496 }
497
498 void ArchiveBuilder::gather_source_objs() {
499 ResourceMark rm;
500 log_info(cds)("Gathering all archivable objects ... ");
501 gather_klasses_and_symbols();
502 GatherSortedSourceObjs doit(this);
503 iterate_sorted_roots(&doit);
504 doit.finish();
505 }
506
507 bool ArchiveBuilder::is_excluded(Klass* klass) {
508 if (klass->is_instance_klass()) {
509 InstanceKlass* ik = InstanceKlass::cast(klass);
510 return SystemDictionaryShared::is_excluded_class(ik);
511 } else if (klass->is_objArray_klass()) {
512 Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
513 if (MetaspaceShared::is_shared_static(bottom)) {
514 // The bottom class is in the static archive so it's clearly not excluded.
515 assert(CDSConfig::is_dumping_dynamic_archive(), "sanity");
516 return false;
517 } else if (bottom->is_instance_klass()) {
518 return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
519 }
520 }
521
522 return false;
523 }
524
525 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
526 address obj = ref->obj();
527 if (MetaspaceShared::is_in_shared_metaspace(obj)) {
528 // Don't dump existing shared metadata again.
529 return point_to_it;
530 } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
531 ref->msotype() == MetaspaceObj::MethodCountersType) {
532 return set_to_null;
533 } else {
534 if (ref->msotype() == MetaspaceObj::ClassType) {
535 Klass* klass = (Klass*)ref->obj();
536 assert(klass->is_klass(), "must be");
537 if (is_excluded(klass)) {
538 ResourceMark rm;
539 log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
540 return set_to_null;
541 }
542 }
543
544 return make_a_copy;
545 }
546 }
547
548 void ArchiveBuilder::start_dump_space(DumpRegion* next) {
549 address bottom = _last_verified_top;
550 address top = (address)(current_dump_space()->top());
551 _other_region_used_bytes += size_t(top - bottom);
552
553 current_dump_space()->pack(next);
554 _current_dump_space = next;
555 _num_dump_regions_used ++;
556
557 _last_verified_top = (address)(current_dump_space()->top());
558 }
559
560 void ArchiveBuilder::verify_estimate_size(size_t estimate, const char* which) {
561 address bottom = _last_verified_top;
562 address top = (address)(current_dump_space()->top());
563 size_t used = size_t(top - bottom) + _other_region_used_bytes;
564 int diff = int(estimate) - int(used);
565
566 log_info(cds)("%s estimate = " SIZE_FORMAT " used = " SIZE_FORMAT "; diff = %d bytes", which, estimate, used, diff);
567 assert(diff >= 0, "Estimate is too small");
568
569 _last_verified_top = top;
570 _other_region_used_bytes = 0;
571 }
572
573 char* ArchiveBuilder::ro_strdup(const char* s) {
574 char* archived_str = ro_region_alloc((int)strlen(s) + 1);
575 strcpy(archived_str, s);
576 return archived_str;
577 }
578
579 void ArchiveBuilder::dump_rw_metadata() {
580 ResourceMark rm;
581 log_info(cds)("Allocating RW objects ... ");
582 make_shallow_copies(&_rw_region, &_rw_src_objs);
583
584 #if INCLUDE_CDS_JAVA_HEAP
585 if (CDSConfig::is_dumping_full_module_graph()) {
586 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
587 char* start = rw_region()->top();
588 ClassLoaderDataShared::allocate_archived_tables();
589 alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
590 }
591 #endif
592 }
593
594 void ArchiveBuilder::dump_ro_metadata() {
595 ResourceMark rm;
596 log_info(cds)("Allocating RO objects ... ");
597
598 start_dump_space(&_ro_region);
599 make_shallow_copies(&_ro_region, &_ro_src_objs);
600
601 #if INCLUDE_CDS_JAVA_HEAP
602 if (CDSConfig::is_dumping_full_module_graph()) {
603 char* start = ro_region()->top();
604 ClassLoaderDataShared::init_archived_tables();
605 alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
606 }
607 #endif
608
609 RegeneratedClasses::record_regenerated_objects();
610 }
611
612 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
613 const ArchiveBuilder::SourceObjList* src_objs) {
614 for (int i = 0; i < src_objs->objs()->length(); i++) {
615 make_shallow_copy(dump_region, src_objs->objs()->at(i));
616 }
617 log_info(cds)("done (%d objects)", src_objs->objs()->length());
618 }
619
620 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
621 address src = src_info->source_addr();
622 int bytes = src_info->size_in_bytes();
623 char* dest;
624 char* oldtop;
625 char* newtop;
626
627 oldtop = dump_region->top();
628 if (src_info->msotype() == MetaspaceObj::ClassType) {
629 // Save a pointer immediate in front of an InstanceKlass, so
630 // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
631 // without building another hashtable. See RunTimeClassInfo::get_for()
632 // in systemDictionaryShared.cpp.
633 Klass* klass = (Klass*)src;
634 if (klass->is_instance_klass()) {
635 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
636 dump_region->allocate(sizeof(address));
637 }
638 }
639 dest = dump_region->allocate(bytes);
640 newtop = dump_region->top();
641
642 memcpy(dest, src, bytes);
643
644 // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
645 if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
646 Symbol* buffered_symbol = (Symbol*)dest;
647 assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
648 buffered_symbol->update_identity_hash();
649 }
650
651 {
652 bool created;
653 _buffered_to_src_table.put_if_absent((address)dest, src, &created);
654 assert(created, "must be");
655 if (_buffered_to_src_table.maybe_grow()) {
656 log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
657 }
658 }
659
660 intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
661 if (archived_vtable != nullptr) {
662 *(address*)dest = (address)archived_vtable;
663 ArchivePtrMarker::mark_pointer((address*)dest);
664 }
665
666 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
667 src_info->set_buffered_addr((address)dest);
668
669 _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
670 }
671
672 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
673 // not handled by MetaspaceClosure.
674 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
675 assert(is_in_buffer_space(ptr_location), "must be");
676 if (src_addr == nullptr) {
677 *ptr_location = nullptr;
678 ArchivePtrMarker::clear_pointer(ptr_location);
679 } else {
680 *ptr_location = get_buffered_addr(src_addr);
681 ArchivePtrMarker::mark_pointer(ptr_location);
682 }
683 }
684
685 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
686 SourceObjInfo* p = _src_obj_table.get(src_addr);
687 assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
688 p2i(src_addr));
689
690 return p->buffered_addr();
691 }
692
693 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
694 assert(is_in_buffer_space(buffered_addr), "must be");
695 address* src_p = _buffered_to_src_table.get(buffered_addr);
696 assert(src_p != nullptr && *src_p != nullptr, "must be");
697 return *src_p;
698 }
699
700 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
701 for (int i = 0; i < src_objs->objs()->length(); i++) {
702 src_objs->relocate(i, this);
703 }
704 }
705
706 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
707 log_info(cds)("Relocating embedded pointers in core regions ... ");
708 relocate_embedded_pointers(&_rw_src_objs);
709 relocate_embedded_pointers(&_ro_src_objs);
710 }
711
712 void ArchiveBuilder::make_klasses_shareable() {
713 int num_instance_klasses = 0;
714 int num_boot_klasses = 0;
715 int num_platform_klasses = 0;
716 int num_app_klasses = 0;
717 int num_hidden_klasses = 0;
718 int num_unlinked_klasses = 0;
719 int num_unregistered_klasses = 0;
720 int num_obj_array_klasses = 0;
721 int num_type_array_klasses = 0;
722
723 for (int i = 0; i < klasses()->length(); i++) {
724 const char* type;
725 const char* unlinked = "";
726 const char* hidden = "";
727 const char* generated = "";
728 Klass* k = get_buffered_addr(klasses()->at(i));
729 k->remove_java_mirror();
730 #ifdef _LP64
731 if (UseCompactObjectHeaders) {
732 Klass* requested_k = to_requested(k);
733 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
734 const int narrow_klass_shift = precomputed_narrow_klass_shift;
735 narrowKlass nk = CompressedKlassPointers::encode_not_null(requested_k, narrow_klass_base, narrow_klass_shift);
736 k->set_prototype_header(markWord::prototype().set_narrow_klass(nk));
737 }
738 #endif //_LP64
739 if (k->is_objArray_klass()) {
740 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
741 // on their array classes.
742 num_obj_array_klasses ++;
743 type = "array";
744 } else if (k->is_typeArray_klass()) {
745 num_type_array_klasses ++;
746 type = "array";
747 k->remove_unshareable_info();
748 } else {
749 assert(k->is_instance_klass(), " must be");
750 num_instance_klasses ++;
751 InstanceKlass* ik = InstanceKlass::cast(k);
752 if (CDSConfig::is_dumping_dynamic_archive()) {
753 // For static dump, class loader type are already set.
754 ik->assign_class_loader_type();
755 }
756 if (ik->is_shared_boot_class()) {
757 type = "boot";
758 num_boot_klasses ++;
759 } else if (ik->is_shared_platform_class()) {
760 type = "plat";
761 num_platform_klasses ++;
762 } else if (ik->is_shared_app_class()) {
763 type = "app";
764 num_app_klasses ++;
765 } else {
766 assert(ik->is_shared_unregistered_class(), "must be");
767 type = "unreg";
768 num_unregistered_klasses ++;
769 }
770
771 if (!ik->is_linked()) {
772 num_unlinked_klasses ++;
773 unlinked = " ** unlinked";
774 }
775
776 if (ik->is_hidden()) {
777 num_hidden_klasses ++;
778 hidden = " ** hidden";
779 }
780
781 if (ik->is_generated_shared_class()) {
782 generated = " ** generated";
783 }
784 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
785 ik->remove_unshareable_info();
786 }
787
788 if (log_is_enabled(Debug, cds, class)) {
789 ResourceMark rm;
790 log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s", i,
791 p2i(to_requested(k)), type, k->external_name(),
792 hidden, unlinked, generated);
793 }
794 }
795
796 log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
797 log_info(cds)(" instance classes = %5d", num_instance_klasses);
798 log_info(cds)(" boot = %5d", num_boot_klasses);
799 log_info(cds)(" app = %5d", num_app_klasses);
800 log_info(cds)(" platform = %5d", num_platform_klasses);
801 log_info(cds)(" unregistered = %5d", num_unregistered_klasses);
802 log_info(cds)(" (hidden) = %5d", num_hidden_klasses);
803 log_info(cds)(" (unlinked) = %5d", num_unlinked_klasses);
804 log_info(cds)(" obj array classes = %5d", num_obj_array_klasses);
805 log_info(cds)(" type array classes = %5d", num_type_array_klasses);
806 log_info(cds)(" symbols = %5d", _symbols->length());
807
808 DynamicArchive::make_array_klasses_shareable();
809 }
810
811 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
812 SymbolTable::serialize_shared_table_header(soc, false);
813 SystemDictionaryShared::serialize_dictionary_headers(soc, false);
814 DynamicArchive::serialize_array_klasses(soc);
815 }
816
817 uintx ArchiveBuilder::buffer_to_offset(address p) const {
818 address requested_p = to_requested(p);
819 assert(requested_p >= _requested_static_archive_bottom, "must be");
820 return requested_p - _requested_static_archive_bottom;
821 }
822
823 uintx ArchiveBuilder::any_to_offset(address p) const {
824 if (is_in_mapped_static_archive(p)) {
825 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
826 return p - _mapped_static_archive_bottom;
827 }
828 if (!is_in_buffer_space(p)) {
829 // p must be a "source" address
830 p = get_buffered_addr(p);
831 }
832 return buffer_to_offset(p);
833 }
834
835 #if INCLUDE_CDS_JAVA_HEAP
836 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
837 assert(CDSConfig::is_dumping_heap(), "sanity");
838 k = get_buffered_klass(k);
839 Klass* requested_k = to_requested(k);
840 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
841 const int narrow_klass_shift = precomputed_narrow_klass_shift;
842 return CompressedKlassPointers::encode_not_null(requested_k, narrow_klass_base, narrow_klass_shift);
843 }
844 #endif // INCLUDE_CDS_JAVA_HEAP
845
846 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
847 // so that the archive can be mapped to the "requested" location without runtime relocation.
848 //
849 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
850 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
851 // - Every pointer must have one of the following values:
852 // [a] nullptr:
853 // No relocation is needed. Remove this pointer from ptrmap so we don't need to
854 // consider it at runtime.
855 // [b] Points into an object X which is inside the buffer:
856 // Adjust this pointer by _buffer_to_requested_delta, so it points to X
857 // when the archive is mapped at the requested location.
858 // [c] Points into an object Y which is inside mapped static archive:
859 // - This happens only during dynamic dump
860 // - Adjust this pointer by _mapped_to_requested_static_archive_delta,
861 // so it points to Y when the static archive is mapped at the requested location.
862 template <bool STATIC_DUMP>
863 class RelocateBufferToRequested : public BitMapClosure {
864 ArchiveBuilder* _builder;
865 address _buffer_bottom;
866 intx _buffer_to_requested_delta;
867 intx _mapped_to_requested_static_archive_delta;
868 size_t _max_non_null_offset;
869
870 public:
871 RelocateBufferToRequested(ArchiveBuilder* builder) {
872 _builder = builder;
873 _buffer_bottom = _builder->buffer_bottom();
874 _buffer_to_requested_delta = builder->buffer_to_requested_delta();
875 _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
876 _max_non_null_offset = 0;
877
878 address bottom = _builder->buffer_bottom();
879 address top = _builder->buffer_top();
880 address new_bottom = bottom + _buffer_to_requested_delta;
881 address new_top = top + _buffer_to_requested_delta;
882 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
883 "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
884 p2i(bottom), p2i(top),
885 p2i(new_bottom), p2i(new_top));
886 }
887
888 bool do_bit(size_t offset) {
889 address* p = (address*)_buffer_bottom + offset;
890 assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
891
892 if (*p == nullptr) {
893 // todo -- clear bit, etc
894 ArchivePtrMarker::ptrmap()->clear_bit(offset);
895 } else {
896 if (STATIC_DUMP) {
897 assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
898 *p += _buffer_to_requested_delta;
899 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
900 } else {
901 if (_builder->is_in_buffer_space(*p)) {
902 *p += _buffer_to_requested_delta;
903 // assert is in requested dynamic archive
904 } else {
905 assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
906 *p += _mapped_to_requested_static_archive_delta;
907 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
908 }
909 }
910 _max_non_null_offset = offset;
911 }
912
913 return true; // keep iterating
914 }
915
916 void doit() {
917 ArchivePtrMarker::ptrmap()->iterate(this);
918 ArchivePtrMarker::compact(_max_non_null_offset);
919 }
920 };
921
922
923 void ArchiveBuilder::relocate_to_requested() {
924 ro_region()->pack();
925
926 size_t my_archive_size = buffer_top() - buffer_bottom();
927
928 if (CDSConfig::is_dumping_static_archive()) {
929 _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
930 RelocateBufferToRequested<true> patcher(this);
931 patcher.doit();
932 } else {
933 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
934 _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
935 RelocateBufferToRequested<false> patcher(this);
936 patcher.doit();
937 }
938 }
939
940 // Write detailed info to a mapfile to analyze contents of the archive.
941 // static dump:
942 // java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
943 // dynamic dump:
944 // java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
945 // -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
946 //
947 // We need to do some address translation because the buffers used at dump time may be mapped to
948 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
949 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
950 // consistency, we log everything using runtime addresses.
951 class ArchiveBuilder::CDSMapLogger : AllStatic {
952 static intx buffer_to_runtime_delta() {
953 // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
954 // at runtime.
955 return ArchiveBuilder::current()->buffer_to_requested_delta();
956 }
957
958 // rw/ro regions only
959 static void log_metaspace_region(const char* name, DumpRegion* region,
960 const ArchiveBuilder::SourceObjList* src_objs) {
961 address region_base = address(region->base());
962 address region_top = address(region->top());
963 log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
964 log_metaspace_objects(region, src_objs);
965 }
966
967 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
968
969 static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
970 ResourceMark rm(current);
971 log_debug(cds, map)(_LOG_PREFIX " %s",
972 p2i(runtime_dest), type_name, bytes, k->external_name());
973 }
974 static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
975 ResourceMark rm(current);
976 log_debug(cds, map)(_LOG_PREFIX " %s",
977 p2i(runtime_dest), type_name, bytes, m->external_name());
978 }
979
980 // rw/ro regions only
981 static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
982 address last_obj_base = address(region->base());
983 address last_obj_end = address(region->base());
984 address region_end = address(region->end());
985 Thread* current = Thread::current();
986 for (int i = 0; i < src_objs->objs()->length(); i++) {
987 SourceObjInfo* src_info = src_objs->at(i);
988 address src = src_info->source_addr();
989 address dest = src_info->buffered_addr();
990 log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
991 address runtime_dest = dest + buffer_to_runtime_delta();
992 int bytes = src_info->size_in_bytes();
993
994 MetaspaceObj::Type type = src_info->msotype();
995 const char* type_name = MetaspaceObj::type_name(type);
996
997 switch (type) {
998 case MetaspaceObj::ClassType:
999 log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1000 break;
1001 case MetaspaceObj::ConstantPoolType:
1002 log_klass(((ConstantPool*)src)->pool_holder(),
1003 runtime_dest, type_name, bytes, current);
1004 break;
1005 case MetaspaceObj::ConstantPoolCacheType:
1006 log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1007 runtime_dest, type_name, bytes, current);
1008 break;
1009 case MetaspaceObj::MethodType:
1010 log_method((Method*)src, runtime_dest, type_name, bytes, current);
1011 break;
1012 case MetaspaceObj::ConstMethodType:
1013 log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1014 break;
1015 case MetaspaceObj::SymbolType:
1016 {
1017 ResourceMark rm(current);
1018 Symbol* s = (Symbol*)src;
1019 log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1020 s->as_quoted_ascii());
1021 }
1022 break;
1023 default:
1024 log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1025 break;
1026 }
1027
1028 last_obj_base = dest;
1029 last_obj_end = dest + bytes;
1030 }
1031
1032 log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1033 if (last_obj_end < region_end) {
1034 log_debug(cds, map)(PTR_FORMAT ": @@ Misc data " SIZE_FORMAT " bytes",
1035 p2i(last_obj_end + buffer_to_runtime_delta()),
1036 size_t(region_end - last_obj_end));
1037 log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1038 }
1039 }
1040
1041 #undef _LOG_PREFIX
1042
1043 // Log information about a region, whose address at dump time is [base .. top). At
1044 // runtime, this region will be mapped to requested_base. requested_base is 0 if this
1045 // region will be mapped at os-selected addresses (such as the bitmap region), or will
1046 // be accessed with os::read (the header).
1047 //
1048 // Note: across -Xshare:dump runs, base may be different, but requested_base should
1049 // be the same as the archive contents should be deterministic.
1050 static void log_region(const char* name, address base, address top, address requested_base) {
1051 size_t size = top - base;
1052 base = requested_base;
1053 top = requested_base + size;
1054 log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " " SIZE_FORMAT_W(9) " bytes]",
1055 name, p2i(base), p2i(top), size);
1056 }
1057
1058 #if INCLUDE_CDS_JAVA_HEAP
1059 static void log_heap_region(ArchiveHeapInfo* heap_info) {
1060 MemRegion r = heap_info->buffer_region();
1061 address start = address(r.start());
1062 address end = address(r.end());
1063 log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1064
1065 LogStreamHandle(Info, cds, map) st;
1066
1067 while (start < end) {
1068 size_t byte_size;
1069 oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1070 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1071 st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1072
1073 if (source_oop != nullptr) {
1074 // This is a regular oop that got archived.
1075 print_oop_with_requested_addr_cr(&st, source_oop, false);
1076 byte_size = source_oop->size() * BytesPerWord;
1077 } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1078 // HeapShared::roots() is copied specially, so it doesn't exist in
1079 // ArchiveHeapWriter::BufferOffsetToSourceObjectTable.
1080 // See ArchiveHeapWriter::copy_roots_to_buffer().
1081 st.print_cr("HeapShared::roots[%d]", HeapShared::pending_roots()->length());
1082 byte_size = ArchiveHeapWriter::heap_roots_word_size() * BytesPerWord;
1083 } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1084 // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1085 st.print_cr("filler " SIZE_FORMAT " bytes", byte_size);
1086 } else {
1087 ShouldNotReachHere();
1088 }
1089
1090 address oop_end = start + byte_size;
1091 log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1092
1093 if (source_oop != nullptr) {
1094 log_oop_details(heap_info, source_oop);
1095 } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1096 log_heap_roots();
1097 }
1098 start = oop_end;
1099 }
1100 }
1101
1102 // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1103 // use _source_obj->print_on(), because we want to print the oop fields
1104 // in _source_obj with their requested addresses using print_oop_with_requested_addr_cr().
1105 class ArchivedFieldPrinter : public FieldClosure {
1106 ArchiveHeapInfo* _heap_info;
1107 outputStream* _st;
1108 oop _source_obj;
1109 public:
1110 ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj) :
1111 _heap_info(heap_info), _st(st), _source_obj(src_obj) {}
1112
1113 void do_field(fieldDescriptor* fd) {
1114 _st->print(" - ");
1115 BasicType ft = fd->field_type();
1116 switch (ft) {
1117 case T_ARRAY:
1118 case T_OBJECT:
1119 fd->print_on(_st); // print just the name and offset
1120 print_oop_with_requested_addr_cr(_st, _source_obj->obj_field(fd->offset()));
1121 break;
1122 default:
1123 if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1124 print_as_native_pointer(fd);
1125 } else {
1126 fd->print_on_for(_st, _source_obj); // name, offset, value
1127 _st->cr();
1128 }
1129 }
1130 }
1131
1132 void print_as_native_pointer(fieldDescriptor* fd) {
1133 LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1134 NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
1135
1136 // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1137 address source_native_ptr = (address)
1138 LP64_ONLY(_source_obj->long_field(fd->offset()))
1139 NOT_LP64( _source_obj->int_field (fd->offset()));
1140 ArchiveBuilder* builder = ArchiveBuilder::current();
1141
1142 // The value of the native pointer at runtime.
1143 address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1144
1145 // The address of _source_obj at runtime
1146 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1147 // The address of this field in the requested space
1148 assert(requested_obj != nullptr, "Attempting to load field from null oop");
1149 address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1150
1151 fd->print_on(_st);
1152 _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1153 p2i(requested_native_ptr), p2i(requested_field_addr));
1154 }
1155 };
1156
1157 // Print the fields of instanceOops, or the elements of arrayOops
1158 static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop) {
1159 LogStreamHandle(Trace, cds, map, oops) st;
1160 if (st.is_enabled()) {
1161 Klass* source_klass = source_oop->klass();
1162 ArchiveBuilder* builder = ArchiveBuilder::current();
1163 Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1164
1165 st.print(" - klass: ");
1166 source_klass->print_value_on(&st);
1167 st.print(" " PTR_FORMAT, p2i(requested_klass));
1168 st.cr();
1169
1170 if (source_oop->is_typeArray()) {
1171 TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1172 } else if (source_oop->is_objArray()) {
1173 objArrayOop source_obj_array = objArrayOop(source_oop);
1174 for (int i = 0; i < source_obj_array->length(); i++) {
1175 st.print(" -%4d: ", i);
1176 print_oop_with_requested_addr_cr(&st, source_obj_array->obj_at(i));
1177 }
1178 } else {
1179 st.print_cr(" - fields (" SIZE_FORMAT " words):", source_oop->size());
1180 ArchivedFieldPrinter print_field(heap_info, &st, source_oop);
1181 InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1182 }
1183 }
1184 }
1185
1186 static void log_heap_roots() {
1187 LogStreamHandle(Trace, cds, map, oops) st;
1188 if (st.is_enabled()) {
1189 for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1190 st.print("roots[%4d]: ", i);
1191 print_oop_with_requested_addr_cr(&st, HeapShared::pending_roots()->at(i));
1192 }
1193 }
1194 }
1195
1196 // The output looks like this. The first number is the requested address. The second number is
1197 // the narrowOop version of the requested address.
1198 // 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class
1199 // 0x00000007ffc000f8 (0xfff8001f) [B length: 11
1200 static void print_oop_with_requested_addr_cr(outputStream* st, oop source_oop, bool print_addr = true) {
1201 if (source_oop == nullptr) {
1202 st->print_cr("null");
1203 } else {
1204 ResourceMark rm;
1205 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1206 if (print_addr) {
1207 st->print(PTR_FORMAT " ", p2i(requested_obj));
1208 }
1209 if (UseCompressedOops) {
1210 st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1211 }
1212 if (source_oop->is_array()) {
1213 int array_len = arrayOop(source_oop)->length();
1214 st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1215 } else {
1216 st->print_cr("%s", source_oop->klass()->external_name());
1217 }
1218 }
1219 }
1220 #endif // INCLUDE_CDS_JAVA_HEAP
1221
1222 // Log all the data [base...top). Pretend that the base address
1223 // will be mapped to requested_base at run-time.
1224 static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1225 assert(top >= base, "must be");
1226
1227 LogStreamHandle(Trace, cds, map) lsh;
1228 if (lsh.is_enabled()) {
1229 int unitsize = sizeof(address);
1230 if (is_heap && UseCompressedOops) {
1231 // This makes the compressed oop pointers easier to read, but
1232 // longs and doubles will be split into two words.
1233 unitsize = sizeof(narrowOop);
1234 }
1235 os::print_hex_dump(&lsh, base, top, unitsize, 32, requested_base);
1236 }
1237 }
1238
1239 static void log_header(FileMapInfo* mapinfo) {
1240 LogStreamHandle(Info, cds, map) lsh;
1241 if (lsh.is_enabled()) {
1242 mapinfo->print(&lsh);
1243 }
1244 }
1245
1246 public:
1247 static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1248 ArchiveHeapInfo* heap_info,
1249 char* bitmap, size_t bitmap_size_in_bytes) {
1250 log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1251
1252 address header = address(mapinfo->header());
1253 address header_end = header + mapinfo->header()->header_size();
1254 log_region("header", header, header_end, 0);
1255 log_header(mapinfo);
1256 log_as_hex(header, header_end, 0);
1257
1258 DumpRegion* rw_region = &builder->_rw_region;
1259 DumpRegion* ro_region = &builder->_ro_region;
1260
1261 log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1262 log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1263
1264 address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1265 log_region("bitmap", address(bitmap), bitmap_end, 0);
1266 log_as_hex((address)bitmap, bitmap_end, 0);
1267
1268 #if INCLUDE_CDS_JAVA_HEAP
1269 if (heap_info->is_used()) {
1270 log_heap_region(heap_info);
1271 }
1272 #endif
1273
1274 log_info(cds, map)("[End of CDS archive map]");
1275 }
1276 }; // end ArchiveBuilder::CDSMapLogger
1277
1278 void ArchiveBuilder::print_stats() {
1279 _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1280 }
1281
1282 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1283 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1284 // MetaspaceShared::n_regions (internal to hotspot).
1285 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1286
1287 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1288 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1289
1290 size_t bitmap_size_in_bytes;
1291 char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::ptrmap(), heap_info,
1292 bitmap_size_in_bytes);
1293
1294 if (heap_info->is_used()) {
1295 _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1296 }
1297
1298 print_region_stats(mapinfo, heap_info);
1299
1300 mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1301 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1302 // After this point, we should not write any data into mapinfo->header() since this
1303 // would corrupt its checksum we have calculated before.
1304 mapinfo->write_header();
1305 mapinfo->close();
1306
1307 if (log_is_enabled(Info, cds)) {
1308 print_stats();
1309 }
1310
1311 if (log_is_enabled(Info, cds, map)) {
1312 CDSMapLogger::log(this, mapinfo, heap_info,
1313 bitmap, bitmap_size_in_bytes);
1314 }
1315 CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1316 FREE_C_HEAP_ARRAY(char, bitmap);
1317 }
1318
1319 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1320 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1321 }
1322
1323 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1324 // Print statistics of all the regions
1325 const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1326 const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1327 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1328 bitmap_reserved +
1329 _total_heap_region_size;
1330 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1331 bitmap_used +
1332 _total_heap_region_size;
1333 const double total_u_perc = percent_of(total_bytes, total_reserved);
1334
1335 _rw_region.print(total_reserved);
1336 _ro_region.print(total_reserved);
1337
1338 print_bitmap_region_stats(bitmap_used, total_reserved);
1339
1340 if (heap_info->is_used()) {
1341 print_heap_region_stats(heap_info, total_reserved);
1342 }
1343
1344 log_debug(cds)("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1345 total_bytes, total_reserved, total_u_perc);
1346 }
1347
1348 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1349 log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1350 size, size/double(total_size)*100.0, size);
1351 }
1352
1353 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1354 char* start = info->buffer_start();
1355 size_t size = info->buffer_byte_size();
1356 char* top = start + size;
1357 log_debug(cds)("hp space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used] at " INTPTR_FORMAT,
1358 size, size/double(total_size)*100.0, size, p2i(start));
1359 }
1360
1361 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1362 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1363 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1364 // or so.
1365 _rw_region.print_out_of_space_msg(name, needed_bytes);
1366 _ro_region.print_out_of_space_msg(name, needed_bytes);
1367
1368 log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1369 MetaspaceShared::unrecoverable_writing_error();
1370 }
1371
1372
1373 #ifndef PRODUCT
1374 void ArchiveBuilder::assert_is_vm_thread() {
1375 assert(Thread::current()->is_VM_thread(), "ArchiveBuilder should be used only inside the VMThread");
1376 }
1377 #endif