1 /*
2 * Copyright (c) 2012, 2020, 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 "jvm.h"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "classfile/classLoaderDataShared.hpp"
29 #include "classfile/classListParser.hpp"
30 #include "classfile/classLoaderExt.hpp"
31 #include "classfile/dictionary.hpp"
32 #include "classfile/loaderConstraints.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/placeholders.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/systemDictionaryShared.hpp"
39 #include "code/codeCache.hpp"
40 #include "gc/shared/softRefPolicy.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/bytecodes.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logMessage.hpp"
45 #include "memory/archiveUtils.inline.hpp"
46 #include "memory/dynamicArchive.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/heapShared.inline.hpp"
49 #include "memory/metaspace.hpp"
50 #include "memory/metaspaceClosure.hpp"
51 #include "memory/metaspaceShared.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/compressedOops.inline.hpp"
55 #include "oops/instanceClassLoaderKlass.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/instanceRefKlass.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/typeArrayKlass.hpp"
63 #include "prims/jvmtiRedefineClasses.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/safepointVerifiers.hpp"
67 #include "runtime/signature.hpp"
68 #include "runtime/timerTrace.hpp"
69 #include "runtime/vmThread.hpp"
70 #include "runtime/vmOperations.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/ostream.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/hashtable.inline.hpp"
76 #if INCLUDE_G1GC
77 #include "gc/g1/g1CollectedHeap.hpp"
78 #endif
79
80 ReservedSpace MetaspaceShared::_shared_rs;
81 VirtualSpace MetaspaceShared::_shared_vs;
82 ReservedSpace MetaspaceShared::_symbol_rs;
83 VirtualSpace MetaspaceShared::_symbol_vs;
84 MetaspaceSharedStats MetaspaceShared::_stats;
85 bool MetaspaceShared::_has_error_classes;
86 bool MetaspaceShared::_archive_loading_failed = false;
87 bool MetaspaceShared::_remapped_readwrite = false;
88 address MetaspaceShared::_i2i_entry_code_buffers = NULL;
89 size_t MetaspaceShared::_i2i_entry_code_buffers_size = 0;
90 void* MetaspaceShared::_shared_metaspace_static_top = NULL;
91 intx MetaspaceShared::_relocation_delta;
92 char* MetaspaceShared::_requested_base_address;
93 bool MetaspaceShared::_use_optimized_module_handling = true;
94 bool MetaspaceShared::_use_full_module_graph = true;
95
96 // The CDS archive is divided into the following regions:
97 // mc - misc code (the method entry trampolines, c++ vtables)
98 // rw - read-write metadata
99 // ro - read-only metadata and read-only tables
100 //
101 // ca0 - closed archive heap space #0
102 // ca1 - closed archive heap space #1 (may be empty)
103 // oa0 - open archive heap space #0
104 // oa1 - open archive heap space #1 (may be empty)
105 //
106 // The mc, rw, and ro regions are linearly allocated, starting from
107 // SharedBaseAddress, in the order of mc->rw->ro. The size of these 3 regions
108 // are page-aligned, and there's no gap between any consecutive regions.
109 //
110 // These 3 regions are populated in the following steps:
111 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
112 // temporarily allocated outside of the shared regions. Only the method entry
113 // trampolines are written into the mc region.
114 // [2] C++ vtables are copied into the mc region.
115 // [3] ArchiveCompactor copies RW metadata into the rw region.
116 // [4] ArchiveCompactor copies RO metadata into the ro region.
117 // [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
118 // are copied into the ro region as read-only tables.
119 //
120 // The s0/s1 and oa0/oa1 regions are populated inside HeapShared::archive_java_heap_objects.
121 // Their layout is independent of the other 4 regions.
122
123 char* DumpRegion::expand_top_to(char* newtop) {
124 assert(is_allocatable(), "must be initialized and not packed");
125 assert(newtop >= _top, "must not grow backwards");
126 if (newtop > _end) {
127 MetaspaceShared::report_out_of_space(_name, newtop - _top);
128 ShouldNotReachHere();
129 }
130
131 if (_rs == MetaspaceShared::shared_rs()) {
132 uintx delta;
133 if (DynamicDumpSharedSpaces) {
134 delta = DynamicArchive::object_delta_uintx(newtop);
135 } else {
136 delta = MetaspaceShared::object_delta_uintx(newtop);
137 }
138 if (delta > MAX_SHARED_DELTA) {
139 // This is just a sanity check and should not appear in any real world usage. This
140 // happens only if you allocate more than 2GB of shared objects and would require
141 // millions of shared classes.
142 vm_exit_during_initialization("Out of memory in the CDS archive",
143 "Please reduce the number of shared classes.");
144 }
145 }
146
147 MetaspaceShared::commit_to(_rs, _vs, newtop);
148 _top = newtop;
149 return _top;
150 }
151
152 char* DumpRegion::allocate(size_t num_bytes, size_t alignment) {
153 char* p = (char*)align_up(_top, alignment);
154 char* newtop = p + align_up(num_bytes, alignment);
155 expand_top_to(newtop);
156 memset(p, 0, newtop - p);
157 return p;
158 }
159
160 void DumpRegion::append_intptr_t(intptr_t n, bool need_to_mark) {
161 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
162 intptr_t *p = (intptr_t*)_top;
163 char* newtop = _top + sizeof(intptr_t);
164 expand_top_to(newtop);
165 *p = n;
166 if (need_to_mark) {
167 ArchivePtrMarker::mark_pointer(p);
168 }
169 }
170
171 void DumpRegion::print(size_t total_bytes) const {
172 log_debug(cds)("%-3s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT,
173 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()),
174 p2i(_base + MetaspaceShared::final_delta()));
175 }
176
177 void DumpRegion::print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
178 log_error(cds)("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
179 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
180 if (strcmp(_name, failing_region) == 0) {
181 log_error(cds)(" required = %d", int(needed_bytes));
182 }
183 }
184
185 void DumpRegion::init(ReservedSpace* rs, VirtualSpace* vs) {
186 _rs = rs;
187 _vs = vs;
188 // Start with 0 committed bytes. The memory will be committed as needed by
189 // MetaspaceShared::commit_to().
190 if (!_vs->initialize(*_rs, 0)) {
191 fatal("Unable to allocate memory for shared space");
192 }
193 _base = _top = _rs->base();
194 _end = _rs->end();
195 }
196
197 void DumpRegion::pack(DumpRegion* next) {
198 assert(!is_packed(), "sanity");
199 _end = (char*)align_up(_top, MetaspaceShared::reserved_space_alignment());
200 _is_packed = true;
201 if (next != NULL) {
202 next->_rs = _rs;
203 next->_vs = _vs;
204 next->_base = next->_top = this->_end;
205 next->_end = _rs->end();
206 }
207 }
208
209 static DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _symbol_region("symbols");
210 static size_t _total_closed_archive_region_size = 0, _total_open_archive_region_size = 0;
211
212 void MetaspaceShared::init_shared_dump_space(DumpRegion* first_space) {
213 first_space->init(&_shared_rs, &_shared_vs);
214 }
215
216 DumpRegion* MetaspaceShared::misc_code_dump_space() {
217 return &_mc_region;
218 }
219
220 DumpRegion* MetaspaceShared::read_write_dump_space() {
221 return &_rw_region;
222 }
223
224 DumpRegion* MetaspaceShared::read_only_dump_space() {
225 return &_ro_region;
226 }
227
228 void MetaspaceShared::pack_dump_space(DumpRegion* current, DumpRegion* next,
229 ReservedSpace* rs) {
230 current->pack(next);
231 }
232
233 char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
234 return _symbol_region.allocate(num_bytes);
235 }
236
237 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
238 return _mc_region.allocate(num_bytes);
239 }
240
241 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
242 return _ro_region.allocate(num_bytes);
243 }
244
245 char* MetaspaceShared::read_write_space_alloc(size_t num_bytes) {
246 return _rw_region.allocate(num_bytes);
247 }
248
249 size_t MetaspaceShared::reserved_space_alignment() { return os::vm_allocation_granularity(); }
250
251 static bool shared_base_valid(char* shared_base) {
252 #ifdef _LP64
253 return CompressedKlassPointers::is_valid_base((address)shared_base);
254 #else
255 return true;
256 #endif
257 }
258
259 static bool shared_base_too_high(char* shared_base, size_t cds_total) {
260 if (SharedBaseAddress != 0 && shared_base < (char*)SharedBaseAddress) {
261 // SharedBaseAddress is very high (e.g., 0xffffffffffffff00) so
262 // align_up(SharedBaseAddress, MetaspaceShared::reserved_space_alignment()) has wrapped around.
263 return true;
264 }
265 if (max_uintx - uintx(shared_base) < uintx(cds_total)) {
266 // The end of the archive will wrap around
267 return true;
268 }
269
270 return false;
271 }
272
273 static char* compute_shared_base(size_t cds_total) {
274 char* shared_base = (char*)align_up((char*)SharedBaseAddress, MetaspaceShared::reserved_space_alignment());
275 const char* err = NULL;
276 if (shared_base_too_high(shared_base, cds_total)) {
277 err = "too high";
278 } else if (!shared_base_valid(shared_base)) {
279 err = "invalid for this platform";
280 }
281 if (err) {
282 log_warning(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
283 p2i((void*)SharedBaseAddress), err,
284 p2i((void*)Arguments::default_SharedBaseAddress()));
285 SharedBaseAddress = Arguments::default_SharedBaseAddress();
286 shared_base = (char*)align_up((char*)SharedBaseAddress, MetaspaceShared::reserved_space_alignment());
287 }
288 assert(!shared_base_too_high(shared_base, cds_total) && shared_base_valid(shared_base), "Sanity");
289 return shared_base;
290 }
291
292 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() {
293 assert(DumpSharedSpaces, "should be called for dump time only");
294
295 const size_t reserve_alignment = MetaspaceShared::reserved_space_alignment();
296
297 #ifdef _LP64
298 // On 64-bit VM we reserve a 4G range and, if UseCompressedClassPointers=1,
299 // will use that to house both the archives and the ccs. See below for
300 // details.
301 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
302 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
303 #else
304 // We don't support archives larger than 256MB on 32-bit due to limited
305 // virtual address space.
306 size_t cds_total = align_down(256*M, reserve_alignment);
307 #endif
308
309 char* shared_base = compute_shared_base(cds_total);
310 _requested_base_address = shared_base;
311
312 // Whether to use SharedBaseAddress as attach address.
313 bool use_requested_base = true;
314
315 if (shared_base == NULL) {
316 use_requested_base = false;
317 }
318
319 if (ArchiveRelocationMode == 1) {
320 log_info(cds)("ArchiveRelocationMode == 1: always allocate class space at an alternative address");
321 use_requested_base = false;
322 }
323
324 // First try to reserve the space at the specified SharedBaseAddress.
325 assert(!_shared_rs.is_reserved(), "must be");
326 if (use_requested_base) {
327 _shared_rs = ReservedSpace(cds_total, reserve_alignment,
328 false /* large */, (char*)shared_base);
329 if (_shared_rs.is_reserved()) {
330 assert(_shared_rs.base() == shared_base, "should match");
331 } else {
332 log_info(cds)("dumptime space reservation: failed to map at "
333 "SharedBaseAddress " PTR_FORMAT, p2i(shared_base));
334 }
335 }
336 if (!_shared_rs.is_reserved()) {
337 // Get a reserved space anywhere if attaching at the SharedBaseAddress
338 // fails:
339 if (UseCompressedClassPointers) {
340 // If we need to reserve class space as well, let the platform handle
341 // the reservation.
342 LP64_ONLY(_shared_rs =
343 Metaspace::reserve_address_space_for_compressed_classes(cds_total);)
344 NOT_LP64(ShouldNotReachHere();)
345 } else {
346 // anywhere is fine.
347 _shared_rs = ReservedSpace(cds_total, reserve_alignment,
348 false /* large */, (char*)NULL);
349 }
350 }
351
352 if (!_shared_rs.is_reserved()) {
353 vm_exit_during_initialization("Unable to reserve memory for shared space",
354 err_msg(SIZE_FORMAT " bytes.", cds_total));
355 }
356
357 #ifdef _LP64
358
359 if (UseCompressedClassPointers) {
360
361 assert(CompressedKlassPointers::is_valid_base((address)_shared_rs.base()), "Sanity");
362
363 // On 64-bit VM, if UseCompressedClassPointers=1, the compressed class space
364 // must be allocated near the cds such as that the compressed Klass pointer
365 // encoding can be used to en/decode pointers from both cds and ccs. Since
366 // Metaspace cannot do this (it knows nothing about cds), we do it for
367 // Metaspace here and pass it the space to use for ccs.
368 //
369 // We do this by reserving space for the ccs behind the archives. Note
370 // however that ccs follows a different alignment
371 // (Metaspace::reserve_alignment), so there may be a gap between ccs and
372 // cds.
373 // We use a similar layout at runtime, see reserve_address_space_for_archives().
374 //
375 // +-- SharedBaseAddress (default = 0x800000000)
376 // v
377 // +-..---------+---------+ ... +----+----+----+--------+-----------------+
378 // | Heap | Archive | | MC | RW | RO | [gap] | class space |
379 // +-..---------+---------+ ... +----+----+----+--------+-----------------+
380 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB -->|
381 //
382 // Note: ccs must follow the archives, and the archives must start at the
383 // encoding base. However, the exact placement of ccs does not matter as
384 // long as it it resides in the encoding range of CompressedKlassPointers
385 // and comes after the archive.
386 //
387 // We do this by splitting up the allocated 4G into 3G of archive space,
388 // followed by 1G for the ccs:
389 // + The upper 1 GB is used as the "temporary compressed class space"
390 // -- preload_classes() will store Klasses into this space.
391 // + The lower 3 GB is used for the archive -- when preload_classes()
392 // is done, ArchiveCompactor will copy the class metadata into this
393 // space, first the RW parts, then the RO parts.
394
395 // Starting address of ccs must be aligned to Metaspace::reserve_alignment()...
396 size_t class_space_size = align_down(_shared_rs.size() / 4, Metaspace::reserve_alignment());
397 address class_space_start = (address)align_down(_shared_rs.end() - class_space_size, Metaspace::reserve_alignment());
398 size_t archive_size = class_space_start - (address)_shared_rs.base();
399
400 ReservedSpace tmp_class_space = _shared_rs.last_part(archive_size);
401 _shared_rs = _shared_rs.first_part(archive_size);
402
403 // ... as does the size of ccs.
404 tmp_class_space = tmp_class_space.first_part(class_space_size);
405 CompressedClassSpaceSize = class_space_size;
406
407 // Let Metaspace initialize ccs
408 Metaspace::initialize_class_space(tmp_class_space);
409
410 // and set up CompressedKlassPointers encoding.
411 CompressedKlassPointers::initialize((address)_shared_rs.base(), cds_total);
412
413 log_info(cds)("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
414 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
415
416 log_info(cds)("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
417 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
418
419 assert(_shared_rs.end() == tmp_class_space.base() &&
420 is_aligned(_shared_rs.base(), MetaspaceShared::reserved_space_alignment()) &&
421 is_aligned(tmp_class_space.base(), Metaspace::reserve_alignment()) &&
422 is_aligned(tmp_class_space.size(), Metaspace::reserve_alignment()), "Sanity");
423 }
424
425 #endif
426
427 init_shared_dump_space(&_mc_region);
428 SharedBaseAddress = (size_t)_shared_rs.base();
429 log_info(cds)("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
430 _shared_rs.size(), p2i(_shared_rs.base()));
431
432 // We don't want any valid object to be at the very bottom of the archive.
433 // See ArchivePtrMarker::mark_pointer().
434 MetaspaceShared::misc_code_space_alloc(16);
435
436 size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
437 _symbol_rs = ReservedSpace(symbol_rs_size);
438 if (!_symbol_rs.is_reserved()) {
439 vm_exit_during_initialization("Unable to reserve memory for symbols",
440 err_msg(SIZE_FORMAT " bytes.", symbol_rs_size));
441 }
442 _symbol_region.init(&_symbol_rs, &_symbol_vs);
443 }
444
445 // Called by universe_post_init()
446 void MetaspaceShared::post_initialize(TRAPS) {
447 if (UseSharedSpaces) {
448 int size = FileMapInfo::get_number_of_shared_paths();
449 if (size > 0) {
450 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD);
451 if (!DynamicDumpSharedSpaces) {
452 FileMapInfo* info;
453 if (FileMapInfo::dynamic_info() == NULL) {
454 info = FileMapInfo::current_info();
455 } else {
456 info = FileMapInfo::dynamic_info();
457 }
458 ClassLoaderExt::init_paths_start_index(info->app_class_paths_start_index());
459 ClassLoaderExt::init_app_module_paths_start_index(info->app_module_paths_start_index());
460 }
461 }
462 }
463 }
464
465 static GrowableArrayCHeap<Handle, mtClassShared>* _extra_interned_strings = NULL;
466
467 void MetaspaceShared::read_extra_data(const char* filename, TRAPS) {
468 _extra_interned_strings = new GrowableArrayCHeap<Handle, mtClassShared>(10000);
469
470 HashtableTextDump reader(filename);
471 reader.check_version("VERSION: 1.0");
472
473 while (reader.remain() > 0) {
474 int utf8_length;
475 int prefix_type = reader.scan_prefix(&utf8_length);
476 ResourceMark rm(THREAD);
477 if (utf8_length == 0x7fffffff) {
478 // buf_len will overflown 32-bit value.
479 vm_exit_during_initialization(err_msg("string length too large: %d", utf8_length));
480 }
481 int buf_len = utf8_length+1;
482 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
483 reader.get_utf8(utf8_buffer, utf8_length);
484 utf8_buffer[utf8_length] = '\0';
485
486 if (prefix_type == HashtableTextDump::SymbolPrefix) {
487 SymbolTable::new_permanent_symbol(utf8_buffer);
488 } else{
489 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
490 oop s = StringTable::intern(utf8_buffer, THREAD);
491
492 if (HAS_PENDING_EXCEPTION) {
493 log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
494 reader.last_line_no(), utf8_length);
495 CLEAR_PENDING_EXCEPTION;
496 } else {
497 #if INCLUDE_G1GC
498 if (UseG1GC) {
499 typeArrayOop body = java_lang_String::value(s);
500 const HeapRegion* hr = G1CollectedHeap::heap()->heap_region_containing(body);
501 if (hr->is_humongous()) {
502 // Don't keep it alive, so it will be GC'ed before we dump the strings, in order
503 // to maximize free heap space and minimize fragmentation.
504 log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
505 reader.last_line_no(), utf8_length);
506 continue;
507 }
508 }
509 #endif
510 // Interned strings are GC'ed if there are no references to it, so let's
511 // add a reference to keep this string alive.
512 assert(s != NULL, "must succeed");
513 Handle h(THREAD, s);
514 _extra_interned_strings->append(h);
515 }
516 }
517 }
518 }
519
520 void MetaspaceShared::commit_to(ReservedSpace* rs, VirtualSpace* vs, char* newtop) {
521 Arguments::assert_is_dumping_archive();
522 char* base = rs->base();
523 size_t need_committed_size = newtop - base;
524 size_t has_committed_size = vs->committed_size();
525 if (need_committed_size < has_committed_size) {
526 return;
527 }
528
529 size_t min_bytes = need_committed_size - has_committed_size;
530 size_t preferred_bytes = 1 * M;
531 size_t uncommitted = vs->reserved_size() - has_committed_size;
532
533 size_t commit =MAX2(min_bytes, preferred_bytes);
534 commit = MIN2(commit, uncommitted);
535 assert(commit <= uncommitted, "sanity");
536
537 bool result = vs->expand_by(commit, false);
538 if (rs == &_shared_rs) {
539 ArchivePtrMarker::expand_ptr_end((address*)vs->high());
540 }
541
542 if (!result) {
543 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
544 need_committed_size));
545 }
546
547 assert(rs == &_shared_rs || rs == &_symbol_rs, "must be");
548 const char* which = (rs == &_shared_rs) ? "shared" : "symbol";
549 log_debug(cds)("Expanding %s spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
550 which, commit, vs->actual_committed_size(), vs->high());
551 }
552
553 void MetaspaceShared::initialize_ptr_marker(CHeapBitMap* ptrmap) {
554 ArchivePtrMarker::initialize(ptrmap, (address*)_shared_vs.low(), (address*)_shared_vs.high());
555 }
556
557 // Read/write a data stream for restoring/preserving metadata pointers and
558 // miscellaneous data from/to the shared archive file.
559
560 void MetaspaceShared::serialize(SerializeClosure* soc) {
561 int tag = 0;
562 soc->do_tag(--tag);
563
564 // Verify the sizes of various metadata in the system.
565 soc->do_tag(sizeof(Method));
566 soc->do_tag(sizeof(ConstMethod));
567 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
568 soc->do_tag(sizeof(ConstantPool));
569 soc->do_tag(sizeof(ConstantPoolCache));
570 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
571 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
572 soc->do_tag(sizeof(Symbol));
573
574 // Dump/restore miscellaneous metadata.
575 JavaClasses::serialize_offsets(soc);
576 Universe::serialize(soc);
577 soc->do_tag(--tag);
578
579 // Dump/restore references to commonly used names and signatures.
580 vmSymbols::serialize(soc);
581 soc->do_tag(--tag);
582
583 // Dump/restore the symbol/string/subgraph_info tables
584 SymbolTable::serialize_shared_table_header(soc);
585 StringTable::serialize_shared_table_header(soc);
586 HeapShared::serialize_subgraph_info_table_header(soc);
587 SystemDictionaryShared::serialize_dictionary_headers(soc);
588
589 InstanceMirrorKlass::serialize_offsets(soc);
590
591 // Dump/restore well known classes (pointers)
592 SystemDictionaryShared::serialize_well_known_klasses(soc);
593 soc->do_tag(--tag);
594
595 serialize_cloned_cpp_vtptrs(soc);
596 soc->do_tag(--tag);
597
598 CDS_JAVA_HEAP_ONLY(ClassLoaderDataShared::serialize(soc));
599
600 soc->do_tag(666);
601 }
602
603 address MetaspaceShared::i2i_entry_code_buffers(size_t total_size) {
604 if (DumpSharedSpaces) {
605 if (_i2i_entry_code_buffers == NULL) {
606 _i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
607 _i2i_entry_code_buffers_size = total_size;
608 }
609 } else if (UseSharedSpaces) {
610 assert(_i2i_entry_code_buffers != NULL, "must already been initialized");
611 } else {
612 return NULL;
613 }
614
615 assert(_i2i_entry_code_buffers_size == total_size, "must not change");
616 return _i2i_entry_code_buffers;
617 }
618
619 uintx MetaspaceShared::object_delta_uintx(void* obj) {
620 Arguments::assert_is_dumping_archive();
621 if (DumpSharedSpaces) {
622 assert(shared_rs()->contains(obj), "must be");
623 } else {
624 assert(is_in_shared_metaspace(obj) || DynamicArchive::is_in_target_space(obj), "must be");
625 }
626 address base_address = address(SharedBaseAddress);
627 uintx deltax = address(obj) - base_address;
628 return deltax;
629 }
630
631 // Global object for holding classes that have been loaded. Since this
632 // is run at a safepoint just before exit, this is the entire set of classes.
633 static GrowableArray<Klass*>* _global_klass_objects;
634
635 static int global_klass_compare(Klass** a, Klass **b) {
636 return a[0]->name()->fast_compare(b[0]->name());
637 }
638
639 GrowableArray<Klass*>* MetaspaceShared::collected_klasses() {
640 return _global_klass_objects;
641 }
642
643 static void collect_array_classes(Klass* k) {
644 _global_klass_objects->append_if_missing(k);
645 if (k->is_array_klass()) {
646 // Add in the array classes too
647 ArrayKlass* ak = ArrayKlass::cast(k);
648 Klass* h = ak->higher_dimension();
649 if (h != NULL) {
650 h->array_klasses_do(collect_array_classes);
651 }
652 }
653 }
654
655 class CollectClassesClosure : public KlassClosure {
656 void do_klass(Klass* k) {
657 if (k->is_instance_klass() &&
658 SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(k))) {
659 // Don't add to the _global_klass_objects
660 } else {
661 _global_klass_objects->append_if_missing(k);
662 }
663 if (k->is_array_klass()) {
664 // Add in the array classes too
665 ArrayKlass* ak = ArrayKlass::cast(k);
666 Klass* h = ak->higher_dimension();
667 if (h != NULL) {
668 h->array_klasses_do(collect_array_classes);
669 }
670 }
671 }
672 };
673
674 // Global object for holding symbols that created during class loading. See SymbolTable::new_symbol
675 static GrowableArray<Symbol*>* _global_symbol_objects = NULL;
676
677 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
678 if (a[0] < b[0]) {
679 return -1;
680 } else if (a[0] == b[0]) {
681 ResourceMark rm;
682 log_warning(cds)("Duplicated symbol %s unexpected", (*a)->as_C_string());
683 return 0;
684 } else {
685 return 1;
686 }
687 }
688
689 void MetaspaceShared::add_symbol(Symbol* sym) {
690 MutexLocker ml(CDSAddSymbol_lock, Mutex::_no_safepoint_check_flag);
691 if (_global_symbol_objects == NULL) {
692 _global_symbol_objects = new (ResourceObj::C_HEAP, mtSymbol) GrowableArray<Symbol*>(2048, mtSymbol);
693 }
694 _global_symbol_objects->append(sym);
695 }
696
697 GrowableArray<Symbol*>* MetaspaceShared::collected_symbols() {
698 return _global_symbol_objects;
699 }
700
701 static void remove_unshareable_in_classes() {
702 for (int i = 0; i < _global_klass_objects->length(); i++) {
703 Klass* k = _global_klass_objects->at(i);
704 if (!k->is_objArray_klass()) {
705 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
706 // on their array classes.
707 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
708 k->remove_unshareable_info();
709 }
710 }
711 }
712
713 static void remove_java_mirror_in_classes() {
714 for (int i = 0; i < _global_klass_objects->length(); i++) {
715 Klass* k = _global_klass_objects->at(i);
716 if (!k->is_objArray_klass()) {
717 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
718 // on their array classes.
719 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
720 k->remove_java_mirror();
721 }
722 }
723 }
724
725 static void rewrite_nofast_bytecode(const methodHandle& method) {
726 BytecodeStream bcs(method);
727 while (!bcs.is_last_bytecode()) {
728 Bytecodes::Code opcode = bcs.next();
729 switch (opcode) {
730 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
731 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
732 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
733 case Bytecodes::_iload: {
734 if (!bcs.is_wide()) {
735 *bcs.bcp() = Bytecodes::_nofast_iload;
736 }
737 break;
738 }
739 default: break;
740 }
741 }
742 }
743
744 // Walk all methods in the class list to ensure that they won't be modified at
745 // run time. This includes:
746 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
747 // at run time by RewriteBytecodes/RewriteFrequentPairs
748 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
749 static void rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread) {
750 for (int i = 0; i < _global_klass_objects->length(); i++) {
751 Klass* k = _global_klass_objects->at(i);
752 if (k->is_instance_klass()) {
753 InstanceKlass* ik = InstanceKlass::cast(k);
754 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(thread, ik);
755 }
756 }
757 }
758
759 void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
760 for (int i = 0; i < ik->methods()->length(); i++) {
761 methodHandle m(thread, ik->methods()->at(i));
762 rewrite_nofast_bytecode(m);
763 Fingerprinter fp(m);
764 // The side effect of this call sets method's fingerprint field.
765 fp.fingerprint();
766 }
767 }
768
769 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
770 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
771 //
772 // Addresses of the vtables and the methods may be different across JVM runs,
773 // if libjvm.so is dynamically loaded at a different base address.
774 //
775 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
776 //
777 // + at dump time: we redirect the _vptr to point to our own vtables inside
778 // the CDS image
779 // + at run time: we clone the actual contents of the vtables from libjvm.so
780 // into our own tables.
781
782 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
783 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
784 f(ConstantPool) \
785 f(InstanceKlass) \
786 f(InstanceClassLoaderKlass) \
787 f(InstanceMirrorKlass) \
788 f(InstanceRefKlass) \
789 f(Method) \
790 f(ObjArrayKlass) \
791 f(TypeArrayKlass)
792
793 class CppVtableInfo {
794 intptr_t _vtable_size;
795 intptr_t _cloned_vtable[1];
796 public:
797 static int num_slots(int vtable_size) {
798 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
799 }
800 int vtable_size() { return int(uintx(_vtable_size)); }
801 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
802 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
803 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
804 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
805 static size_t byte_size(int vtable_size) {
806 CppVtableInfo i;
807 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
808 }
809 };
810
811 static inline intptr_t* vtable_of(Metadata* m) {
812 return *((intptr_t**)m);
813 }
814
815 template <class T> class CppVtableCloner : public T {
816 static CppVtableInfo* _info;
817
818 static int get_vtable_length(const char* name);
819
820 public:
821 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
822 static intptr_t* allocate(const char* name);
823
824 // Clone the vtable to ...
825 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
826
827 static void zero_vtable_clone() {
828 assert(DumpSharedSpaces, "dump-time only");
829 _info->zero();
830 }
831
832 static bool is_valid_shared_object(const T* obj) {
833 intptr_t* vptr = *(intptr_t**)obj;
834 return vptr == _info->cloned_vtable();
835 }
836
837 static void init_orig_cpp_vtptr(int kind);
838 };
839
840 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
841
842 template <class T>
843 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
844 assert(is_aligned(_mc_region.top(), sizeof(intptr_t)), "bad alignment");
845 int n = get_vtable_length(name);
846 _info = (CppVtableInfo*)_mc_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
847 _info->set_vtable_size(n);
848
849 intptr_t* p = clone_vtable(name, _info);
850 assert((char*)p == _mc_region.top(), "must be");
851
852 return _info->cloned_vtable();
853 }
854
855 template <class T>
856 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
857 if (!DumpSharedSpaces) {
858 assert(_info == 0, "_info is initialized only at dump time");
859 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
860 }
861 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
862 int n = info->vtable_size();
863 intptr_t* srcvtable = vtable_of(&tmp);
864 intptr_t* dstvtable = info->cloned_vtable();
865
866 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
867 // safe to do memcpy.
868 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
869 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
870 return dstvtable + n;
871 }
872
873 // To determine the size of the vtable for each type, we use the following
874 // trick by declaring 2 subclasses:
875 //
876 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
877 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
878 //
879 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
880 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
881 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
882 // - Their last entry is different.
883 //
884 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
885 // and find the first entry that's different.
886 //
887 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
888 // esoteric compilers.
889
890 template <class T> class CppVtableTesterB: public T {
891 public:
892 virtual int last_virtual_method() {return 1;}
893 };
894
895 template <class T> class CppVtableTesterA : public T {
896 public:
897 virtual void* last_virtual_method() {
898 // Make this different than CppVtableTesterB::last_virtual_method so the C++
899 // compiler/linker won't alias the two functions.
900 return NULL;
901 }
902 };
903
904 template <class T>
905 int CppVtableCloner<T>::get_vtable_length(const char* name) {
906 CppVtableTesterA<T> a;
907 CppVtableTesterB<T> b;
908
909 intptr_t* avtable = vtable_of(&a);
910 intptr_t* bvtable = vtable_of(&b);
911
912 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
913 int vtable_len = 1;
914 for (; ; vtable_len++) {
915 if (avtable[vtable_len] != bvtable[vtable_len]) {
916 break;
917 }
918 }
919 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
920
921 return vtable_len;
922 }
923
924 #define ALLOC_CPP_VTABLE_CLONE(c) \
925 _cloned_cpp_vtptrs[c##_Kind] = CppVtableCloner<c>::allocate(#c); \
926 ArchivePtrMarker::mark_pointer(&_cloned_cpp_vtptrs[c##_Kind]);
927
928 #define CLONE_CPP_VTABLE(c) \
929 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
930
931 #define ZERO_CPP_VTABLE(c) \
932 CppVtableCloner<c>::zero_vtable_clone();
933
934 #define INIT_ORIG_CPP_VTPTRS(c) \
935 CppVtableCloner<c>::init_orig_cpp_vtptr(c##_Kind);
936
937 #define DECLARE_CLONED_VTABLE_KIND(c) c ## _Kind,
938
939 enum ClonedVtableKind {
940 // E.g., ConstantPool_Kind == 0, InstanceKlass_Kind == 1, etc.
941 CPP_VTABLE_PATCH_TYPES_DO(DECLARE_CLONED_VTABLE_KIND)
942 _num_cloned_vtable_kinds
943 };
944
945 // This is a map of all the original vtptrs. E.g., for
946 // ConstantPool *cp = new (...) ConstantPool(...) ; // a dynamically allocated constant pool
947 // the following holds true:
948 // _orig_cpp_vtptrs[ConstantPool_Kind] == ((intptr_t**)cp)[0]
949 static intptr_t* _orig_cpp_vtptrs[_num_cloned_vtable_kinds];
950 static bool _orig_cpp_vtptrs_inited = false;
951
952 template <class T>
953 void CppVtableCloner<T>::init_orig_cpp_vtptr(int kind) {
954 assert(kind < _num_cloned_vtable_kinds, "sanity");
955 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
956 intptr_t* srcvtable = vtable_of(&tmp);
957 _orig_cpp_vtptrs[kind] = srcvtable;
958 }
959
960 // This is the index of all the cloned vtables. E.g., for
961 // ConstantPool* cp = ....; // an archived constant pool
962 // InstanceKlass* ik = ....;// an archived class
963 // the following holds true:
964 // _cloned_cpp_vtptrs[ConstantPool_Kind] == ((intptr_t**)cp)[0]
965 // _cloned_cpp_vtptrs[InstanceKlass_Kind] == ((intptr_t**)ik)[0]
966 static intptr_t** _cloned_cpp_vtptrs = NULL;
967
968 void MetaspaceShared::allocate_cloned_cpp_vtptrs() {
969 assert(DumpSharedSpaces, "must");
970 size_t vtptrs_bytes = _num_cloned_vtable_kinds * sizeof(intptr_t*);
971 _cloned_cpp_vtptrs = (intptr_t**)_mc_region.allocate(vtptrs_bytes, sizeof(intptr_t*));
972 }
973
974 void MetaspaceShared::serialize_cloned_cpp_vtptrs(SerializeClosure* soc) {
975 soc->do_ptr((void**)&_cloned_cpp_vtptrs);
976 }
977
978 intptr_t* MetaspaceShared::get_archived_cpp_vtable(MetaspaceObj::Type msotype, address obj) {
979 if (!_orig_cpp_vtptrs_inited) {
980 CPP_VTABLE_PATCH_TYPES_DO(INIT_ORIG_CPP_VTPTRS);
981 _orig_cpp_vtptrs_inited = true;
982 }
983
984 Arguments::assert_is_dumping_archive();
985 int kind = -1;
986 switch (msotype) {
987 case MetaspaceObj::SymbolType:
988 case MetaspaceObj::TypeArrayU1Type:
989 case MetaspaceObj::TypeArrayU2Type:
990 case MetaspaceObj::TypeArrayU4Type:
991 case MetaspaceObj::TypeArrayU8Type:
992 case MetaspaceObj::TypeArrayOtherType:
993 case MetaspaceObj::ConstMethodType:
994 case MetaspaceObj::ConstantPoolCacheType:
995 case MetaspaceObj::AnnotationsType:
996 case MetaspaceObj::MethodCountersType:
997 case MetaspaceObj::RecordComponentType:
998 // These have no vtables.
999 break;
1000 case MetaspaceObj::MethodDataType:
1001 // We don't archive MethodData <-- should have been removed in removed_unsharable_info
1002 ShouldNotReachHere();
1003 break;
1004 default:
1005 for (kind = 0; kind < _num_cloned_vtable_kinds; kind ++) {
1006 if (vtable_of((Metadata*)obj) == _orig_cpp_vtptrs[kind]) {
1007 break;
1008 }
1009 }
1010 if (kind >= _num_cloned_vtable_kinds) {
1011 fatal("Cannot find C++ vtable for " INTPTR_FORMAT " -- you probably added"
1012 " a new subtype of Klass or MetaData without updating CPP_VTABLE_PATCH_TYPES_DO",
1013 p2i(obj));
1014 }
1015 }
1016
1017 if (kind >= 0) {
1018 assert(kind < _num_cloned_vtable_kinds, "must be");
1019 return _cloned_cpp_vtptrs[kind];
1020 } else {
1021 return NULL;
1022 }
1023 }
1024
1025 // This can be called at both dump time and run time:
1026 // - clone the contents of the c++ vtables into the space
1027 // allocated by allocate_cpp_vtable_clones()
1028 void MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
1029 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
1030 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
1031 }
1032
1033 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
1034 assert(DumpSharedSpaces, "dump-time only");
1035 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
1036 }
1037
1038 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
1039 char* MetaspaceShared::allocate_cpp_vtable_clones() {
1040 char* cloned_vtables = _mc_region.top(); // This is the beginning of all the cloned vtables
1041
1042 assert(DumpSharedSpaces, "dump-time only");
1043 // Layout (each slot is a intptr_t):
1044 // [number of slots in the first vtable = n1]
1045 // [ <n1> slots for the first vtable]
1046 // [number of slots in the first second = n2]
1047 // [ <n2> slots for the second vtable]
1048 // ...
1049 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
1050 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
1051
1052 return cloned_vtables;
1053 }
1054
1055 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
1056 assert(is_in_shared_metaspace(m), "must be");
1057 return CppVtableCloner<Method>::is_valid_shared_object(m);
1058 }
1059
1060 void WriteClosure::do_oop(oop* o) {
1061 if (*o == NULL) {
1062 _dump_region->append_intptr_t(0);
1063 } else {
1064 assert(HeapShared::is_heap_object_archiving_allowed(),
1065 "Archiving heap object is not allowed");
1066 _dump_region->append_intptr_t(
1067 (intptr_t)CompressedOops::encode_not_null(*o));
1068 }
1069 }
1070
1071 void WriteClosure::do_region(u_char* start, size_t size) {
1072 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1073 assert(size % sizeof(intptr_t) == 0, "bad size");
1074 do_tag((int)size);
1075 while (size > 0) {
1076 _dump_region->append_intptr_t(*(intptr_t*)start, true);
1077 start += sizeof(intptr_t);
1078 size -= sizeof(intptr_t);
1079 }
1080 }
1081
1082 // This is for dumping detailed statistics for the allocations
1083 // in the shared spaces.
1084 class DumpAllocStats : public ResourceObj {
1085 public:
1086
1087 // Here's poor man's enum inheritance
1088 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
1089 METASPACE_OBJ_TYPES_DO(f) \
1090 f(SymbolHashentry) \
1091 f(SymbolBucket) \
1092 f(StringHashentry) \
1093 f(StringBucket) \
1094 f(ModulesNatives) \
1095 f(Other)
1096
1097 enum Type {
1098 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
1099 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
1100 _number_of_types
1101 };
1102
1103 static const char * type_name(Type type) {
1104 switch(type) {
1105 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
1106 default:
1107 ShouldNotReachHere();
1108 return NULL;
1109 }
1110 }
1111
1112 public:
1113 enum { RO = 0, RW = 1 };
1114
1115 int _counts[2][_number_of_types];
1116 int _bytes [2][_number_of_types];
1117
1118 DumpAllocStats() {
1119 memset(_counts, 0, sizeof(_counts));
1120 memset(_bytes, 0, sizeof(_bytes));
1121 };
1122
1123 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
1124 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
1125 int which = (read_only) ? RO : RW;
1126 _counts[which][type] ++;
1127 _bytes [which][type] += byte_size;
1128 }
1129
1130 void record_modules(int byte_size, bool read_only) {
1131 int which = (read_only) ? RO : RW;
1132 _bytes [which][ModulesNativesType] += byte_size;
1133 }
1134
1135 void record_other_type(int byte_size, bool read_only) {
1136 int which = (read_only) ? RO : RW;
1137 _bytes [which][OtherType] += byte_size;
1138 }
1139 void print_stats(int ro_all, int rw_all, int mc_all);
1140 };
1141
1142 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all) {
1143 // Calculate size of data that was not allocated by Metaspace::allocate()
1144 MetaspaceSharedStats *stats = MetaspaceShared::stats();
1145
1146 // symbols
1147 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
1148 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
1149
1150 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
1151 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
1152
1153 // strings
1154 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
1155 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
1156
1157 _counts[RO][StringBucketType] = stats->string.bucket_count;
1158 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
1159
1160 // TODO: count things like dictionary, vtable, etc
1161 _bytes[RW][OtherType] += mc_all;
1162 rw_all += mc_all; // mc is mapped Read/Write
1163
1164 // prevent divide-by-zero
1165 if (ro_all < 1) {
1166 ro_all = 1;
1167 }
1168 if (rw_all < 1) {
1169 rw_all = 1;
1170 }
1171
1172 int all_ro_count = 0;
1173 int all_ro_bytes = 0;
1174 int all_rw_count = 0;
1175 int all_rw_bytes = 0;
1176
1177 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
1178 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
1179 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
1180 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
1181
1182 LogMessage(cds) msg;
1183
1184 msg.debug("Detailed metadata info (excluding st regions; rw stats include mc regions):");
1185 msg.debug("%s", hdr);
1186 msg.debug("%s", sep);
1187 for (int type = 0; type < int(_number_of_types); type ++) {
1188 const char *name = type_name((Type)type);
1189 int ro_count = _counts[RO][type];
1190 int ro_bytes = _bytes [RO][type];
1191 int rw_count = _counts[RW][type];
1192 int rw_bytes = _bytes [RW][type];
1193 int count = ro_count + rw_count;
1194 int bytes = ro_bytes + rw_bytes;
1195
1196 double ro_perc = percent_of(ro_bytes, ro_all);
1197 double rw_perc = percent_of(rw_bytes, rw_all);
1198 double perc = percent_of(bytes, ro_all + rw_all);
1199
1200 msg.debug(fmt_stats, name,
1201 ro_count, ro_bytes, ro_perc,
1202 rw_count, rw_bytes, rw_perc,
1203 count, bytes, perc);
1204
1205 all_ro_count += ro_count;
1206 all_ro_bytes += ro_bytes;
1207 all_rw_count += rw_count;
1208 all_rw_bytes += rw_bytes;
1209 }
1210
1211 int all_count = all_ro_count + all_rw_count;
1212 int all_bytes = all_ro_bytes + all_rw_bytes;
1213
1214 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1215 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1216 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1217
1218 msg.debug("%s", sep);
1219 msg.debug(fmt_stats, "Total",
1220 all_ro_count, all_ro_bytes, all_ro_perc,
1221 all_rw_count, all_rw_bytes, all_rw_perc,
1222 all_count, all_bytes, all_perc);
1223
1224 assert(all_ro_bytes == ro_all, "everything should have been counted");
1225 assert(all_rw_bytes == rw_all, "everything should have been counted");
1226
1227 #undef fmt_stats
1228 }
1229
1230 // Populate the shared space.
1231
1232 class VM_PopulateDumpSharedSpace: public VM_Operation {
1233 private:
1234 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1235 GrowableArray<MemRegion> *_open_archive_heap_regions;
1236
1237 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
1238 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
1239
1240 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1241 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
1242 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1243 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
1244 void dump_symbols();
1245 char* dump_read_only_tables();
1246 void print_class_stats();
1247 void print_region_stats(FileMapInfo* map_info);
1248 void print_bitmap_region_stats(size_t size, size_t total_size);
1249 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1250 const char *name, size_t total_size);
1251 void relocate_to_requested_base_address(CHeapBitMap* ptrmap);
1252
1253 public:
1254
1255 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1256 void doit(); // outline because gdb sucks
1257 bool allow_nested_vm_operations() const { return true; }
1258 }; // class VM_PopulateDumpSharedSpace
1259
1260 // ArchiveCompactor --
1261 //
1262 // This class is the central piece of shared archive compaction -- all metaspace data are
1263 // initially allocated outside of the shared regions. ArchiveCompactor copies the
1264 // metaspace data into their final location in the shared regions.
1265
1266 class ArchiveCompactor : AllStatic {
1267 static const int INITIAL_TABLE_SIZE = 8087;
1268 static const int MAX_TABLE_SIZE = 1000000;
1269
1270 static DumpAllocStats* _alloc_stats;
1271
1272 typedef KVHashtable<address, address, mtInternal> RelocationTable;
1273 static RelocationTable* _new_loc_table;
1274
1275 public:
1276 static void initialize() {
1277 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1278 _new_loc_table = new RelocationTable(INITIAL_TABLE_SIZE);
1279 }
1280 static DumpAllocStats* alloc_stats() {
1281 return _alloc_stats;
1282 }
1283
1284 // Use this when you allocate space with MetaspaceShare::read_only_space_alloc()
1285 // outside of ArchiveCompactor::allocate(). These are usually for misc tables
1286 // that are allocated in the RO space.
1287 class OtherROAllocMark {
1288 char* _oldtop;
1289 public:
1290 OtherROAllocMark() {
1291 _oldtop = _ro_region.top();
1292 }
1293 ~OtherROAllocMark() {
1294 char* newtop = _ro_region.top();
1295 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
1296 }
1297 };
1298
1299 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1300 address obj = ref->obj();
1301 int bytes = ref->size() * BytesPerWord;
1302 char* p;
1303 size_t alignment = BytesPerWord;
1304 char* oldtop;
1305 char* newtop;
1306
1307 if (read_only) {
1308 oldtop = _ro_region.top();
1309 p = _ro_region.allocate(bytes, alignment);
1310 newtop = _ro_region.top();
1311 } else {
1312 oldtop = _rw_region.top();
1313 if (ref->msotype() == MetaspaceObj::ClassType) {
1314 // Save a pointer immediate in front of an InstanceKlass, so
1315 // we can do a quick lookup from InstanceKlass* -> RunTimeSharedClassInfo*
1316 // without building another hashtable. See RunTimeSharedClassInfo::get_for()
1317 // in systemDictionaryShared.cpp.
1318 Klass* klass = (Klass*)obj;
1319 if (klass->is_instance_klass()) {
1320 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
1321 _rw_region.allocate(sizeof(address), BytesPerWord);
1322 }
1323 }
1324 p = _rw_region.allocate(bytes, alignment);
1325 newtop = _rw_region.top();
1326 }
1327 memcpy(p, obj, bytes);
1328
1329 intptr_t* archived_vtable = MetaspaceShared::get_archived_cpp_vtable(ref->msotype(), (address)p);
1330 if (archived_vtable != NULL) {
1331 *(address*)p = (address)archived_vtable;
1332 ArchivePtrMarker::mark_pointer((address*)p);
1333 }
1334
1335 assert(_new_loc_table->lookup(obj) == NULL, "each object can be relocated at most once");
1336 _new_loc_table->add(obj, (address)p);
1337 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1338 if (_new_loc_table->maybe_grow(MAX_TABLE_SIZE)) {
1339 log_info(cds, hashtables)("Expanded _new_loc_table to %d", _new_loc_table->table_size());
1340 }
1341 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1342 }
1343
1344 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1345 address* pp = _new_loc_table->lookup(ref->obj());
1346 assert(pp != NULL, "must be");
1347 return *pp;
1348 }
1349
1350 private:
1351 // Makes a shallow copy of visited MetaspaceObj's
1352 class ShallowCopier: public UniqueMetaspaceClosure {
1353 bool _read_only;
1354 public:
1355 ShallowCopier(bool read_only) : _read_only(read_only) {}
1356
1357 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1358 if (read_only == _read_only) {
1359 allocate(ref, read_only);
1360 }
1361 return true; // recurse into ref.obj()
1362 }
1363 };
1364
1365 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1366 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1367 public:
1368 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1369 address new_loc = get_new_loc(ref);
1370 RefRelocator refer;
1371 ref->metaspace_pointers_do_at(&refer, new_loc);
1372 return true; // recurse into ref.obj()
1373 }
1374 virtual void push_special(SpecialRef type, Ref* ref, intptr_t* p) {
1375 assert(type == _method_entry_ref, "only special type allowed for now");
1376 address obj = ref->obj();
1377 address new_obj = get_new_loc(ref);
1378 size_t offset = pointer_delta(p, obj, sizeof(u1));
1379 intptr_t* new_p = (intptr_t*)(new_obj + offset);
1380 assert(*p == *new_p, "must be a copy");
1381 ArchivePtrMarker::mark_pointer((address*)new_p);
1382 }
1383 };
1384
1385 // Relocate a reference to point to its shallow copy
1386 class RefRelocator: public MetaspaceClosure {
1387 public:
1388 virtual bool do_ref(Ref* ref, bool read_only) {
1389 if (ref->not_null()) {
1390 ref->update(get_new_loc(ref));
1391 ArchivePtrMarker::mark_pointer(ref->addr());
1392 }
1393 return false; // Do not recurse.
1394 }
1395 };
1396
1397 #ifdef ASSERT
1398 class IsRefInArchiveChecker: public MetaspaceClosure {
1399 public:
1400 virtual bool do_ref(Ref* ref, bool read_only) {
1401 if (ref->not_null()) {
1402 char* obj = (char*)ref->obj();
1403 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1404 "must be relocated to point to CDS archive");
1405 }
1406 return false; // Do not recurse.
1407 }
1408 };
1409 #endif
1410
1411 public:
1412 static void copy_and_compact() {
1413 ResourceMark rm;
1414
1415 log_info(cds)("Scanning all metaspace objects ... ");
1416 {
1417 // allocate and shallow-copy RW objects, immediately following the MC region
1418 log_info(cds)("Allocating RW objects ... ");
1419 _mc_region.pack(&_rw_region);
1420
1421 ResourceMark rm;
1422 ShallowCopier rw_copier(false);
1423 iterate_roots(&rw_copier);
1424
1425 #if INCLUDE_CDS_JAVA_HEAP
1426 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
1427 char* start = _rw_region.top();
1428 ClassLoaderDataShared::allocate_archived_tables();
1429 ArchiveCompactor::alloc_stats()->record_modules(_rw_region.top() - start, /*read_only*/false);
1430 #endif
1431 }
1432 {
1433 // allocate and shallow-copy of RO object, immediately following the RW region
1434 log_info(cds)("Allocating RO objects ... ");
1435 _rw_region.pack(&_ro_region);
1436
1437 ResourceMark rm;
1438 ShallowCopier ro_copier(true);
1439 iterate_roots(&ro_copier);
1440 #if INCLUDE_CDS_JAVA_HEAP
1441 char* start = _ro_region.top();
1442 ClassLoaderDataShared::init_archived_tables();
1443 ArchiveCompactor::alloc_stats()->record_modules(_ro_region.top() - start, /*read_only*/true);
1444 #endif
1445 }
1446 {
1447 log_info(cds)("Relocating embedded pointers ... ");
1448 ResourceMark rm;
1449 ShallowCopyEmbeddedRefRelocator emb_reloc;
1450 iterate_roots(&emb_reloc);
1451 }
1452 {
1453 log_info(cds)("Relocating external roots ... ");
1454 ResourceMark rm;
1455 RefRelocator ext_reloc;
1456 iterate_roots(&ext_reloc);
1457 }
1458 {
1459 log_info(cds)("Fixing symbol identity hash ... ");
1460 os::init_random(0x12345678);
1461 GrowableArray<Symbol*>* all_symbols = MetaspaceShared::collected_symbols();
1462 all_symbols->sort(compare_symbols_by_address);
1463 for (int i = 0; i < all_symbols->length(); i++) {
1464 assert(all_symbols->at(i)->is_permanent(), "archived symbols must be permanent");
1465 all_symbols->at(i)->update_identity_hash();
1466 }
1467 }
1468 #ifdef ASSERT
1469 {
1470 log_info(cds)("Verifying external roots ... ");
1471 ResourceMark rm;
1472 IsRefInArchiveChecker checker;
1473 iterate_roots(&checker);
1474 }
1475 #endif
1476 }
1477
1478 // We must relocate the System::_well_known_klasses only after we have copied the
1479 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1480 // old objects which assert that their klass is the original klass.
1481 static void relocate_well_known_klasses() {
1482 {
1483 log_info(cds)("Relocating SystemDictionary::_well_known_klasses[] ... ");
1484 ResourceMark rm;
1485 RefRelocator ext_reloc;
1486 SystemDictionary::well_known_klasses_do(&ext_reloc);
1487 }
1488 // NOTE: after this point, we shouldn't have any globals that can reach the old
1489 // objects.
1490
1491 // We cannot use any of the objects in the heap anymore (except for the
1492 // shared strings) because their headers no longer point to valid Klasses.
1493 }
1494
1495 static void iterate_roots(MetaspaceClosure* it) {
1496 // To ensure deterministic contents in the archive, we just need to ensure that
1497 // we iterate the MetsapceObjs in a deterministic order. It doesn't matter where
1498 // the MetsapceObjs are located originally, as they are copied sequentially into
1499 // the archive during the iteration.
1500 //
1501 // The only issue here is that the symbol table and the system directories may be
1502 // randomly ordered, so we copy the symbols and klasses into two arrays and sort
1503 // them deterministically.
1504 //
1505 // During -Xshare:dump, the order of Symbol creation is strictly determined by
1506 // the SharedClassListFile (class loading is done in a single thread and the JIT
1507 // is disabled). Also, Symbols are allocated in monotonically increasing addresses
1508 // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
1509 // ascending address order, we ensure that all Symbols are copied into deterministic
1510 // locations in the archive.
1511 GrowableArray<Symbol*>* symbols = _global_symbol_objects;
1512 for (int i = 0; i < symbols->length(); i++) {
1513 it->push(symbols->adr_at(i));
1514 }
1515 if (_global_klass_objects != NULL) {
1516 // Need to fix up the pointers
1517 for (int i = 0; i < _global_klass_objects->length(); i++) {
1518 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1519 it->push(_global_klass_objects->adr_at(i));
1520 }
1521 }
1522 FileMapInfo::metaspace_pointers_do(it, false);
1523 SystemDictionaryShared::dumptime_classes_do(it);
1524 Universe::metaspace_pointers_do(it);
1525 SymbolTable::metaspace_pointers_do(it);
1526 vmSymbols::metaspace_pointers_do(it);
1527
1528 it->finish();
1529 }
1530
1531 static Klass* get_relocated_klass(Klass* orig_klass) {
1532 assert(DumpSharedSpaces, "dump time only");
1533 address* pp = _new_loc_table->lookup((address)orig_klass);
1534 assert(pp != NULL, "must be");
1535 Klass* klass = (Klass*)(*pp);
1536 assert(klass->is_klass(), "must be");
1537 return klass;
1538 }
1539
1540 static Symbol* get_relocated_symbol(Symbol* orig_symbol) {
1541 assert(DumpSharedSpaces, "dump time only");
1542 address* pp = _new_loc_table->lookup((address)orig_symbol);
1543 assert(pp != NULL, "must be");
1544 return (Symbol*)(*pp);
1545 }
1546 };
1547
1548 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1549 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1550
1551 void VM_PopulateDumpSharedSpace::dump_symbols() {
1552 log_info(cds)("Dumping symbol table ...");
1553
1554 NOT_PRODUCT(SymbolTable::verify());
1555 SymbolTable::write_to_archive();
1556 }
1557
1558 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1559 ArchiveCompactor::OtherROAllocMark mark;
1560
1561 log_info(cds)("Removing java_mirror ... ");
1562 if (!HeapShared::is_heap_object_archiving_allowed()) {
1563 Universe::clear_basic_type_mirrors();
1564 }
1565 remove_java_mirror_in_classes();
1566 log_info(cds)("done. ");
1567
1568 SystemDictionaryShared::write_to_archive();
1569
1570 // Write the other data to the output array.
1571 char* start = _ro_region.top();
1572 WriteClosure wc(&_ro_region);
1573 MetaspaceShared::serialize(&wc);
1574
1575 // Write the bitmaps for patching the archive heap regions
1576 _closed_archive_heap_oopmaps = NULL;
1577 _open_archive_heap_oopmaps = NULL;
1578 dump_archive_heap_oopmaps();
1579
1580 return start;
1581 }
1582
1583 void VM_PopulateDumpSharedSpace::print_class_stats() {
1584 log_info(cds)("Number of classes %d", _global_klass_objects->length());
1585 {
1586 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1587 for (int i = 0; i < _global_klass_objects->length(); i++) {
1588 Klass* k = _global_klass_objects->at(i);
1589 if (k->is_instance_klass()) {
1590 num_inst ++;
1591 } else if (k->is_objArray_klass()) {
1592 num_obj_array ++;
1593 } else {
1594 assert(k->is_typeArray_klass(), "sanity");
1595 num_type_array ++;
1596 }
1597 }
1598 log_info(cds)(" instance classes = %5d", num_inst);
1599 log_info(cds)(" obj array classes = %5d", num_obj_array);
1600 log_info(cds)(" type array classes = %5d", num_type_array);
1601 }
1602 }
1603
1604 void VM_PopulateDumpSharedSpace::relocate_to_requested_base_address(CHeapBitMap* ptrmap) {
1605 intx addr_delta = MetaspaceShared::final_delta();
1606 if (addr_delta == 0) {
1607 ArchivePtrMarker::compact((address)SharedBaseAddress, (address)_ro_region.top());
1608 } else {
1609 // We are not able to reserve space at MetaspaceShared::requested_base_address() (due to ASLR).
1610 // This means that the current content of the archive is based on a random
1611 // address. Let's relocate all the pointers, so that it can be mapped to
1612 // MetaspaceShared::requested_base_address() without runtime relocation.
1613 //
1614 // Note: both the base and dynamic archive are written with
1615 // FileMapHeader::_requested_base_address == MetaspaceShared::requested_base_address()
1616
1617 // Patch all pointers that are marked by ptrmap within this region,
1618 // where we have just dumped all the metaspace data.
1619 address patch_base = (address)SharedBaseAddress;
1620 address patch_end = (address)_ro_region.top();
1621 size_t size = patch_end - patch_base;
1622
1623 // the current value of the pointers to be patched must be within this
1624 // range (i.e., must point to valid metaspace objects)
1625 address valid_old_base = patch_base;
1626 address valid_old_end = patch_end;
1627
1628 // after patching, the pointers must point inside this range
1629 // (the requested location of the archive, as mapped at runtime).
1630 address valid_new_base = (address)MetaspaceShared::requested_base_address();
1631 address valid_new_end = valid_new_base + size;
1632
1633 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT " ] to "
1634 "[" INTPTR_FORMAT " - " INTPTR_FORMAT " ]", p2i(patch_base), p2i(patch_end),
1635 p2i(valid_new_base), p2i(valid_new_end));
1636
1637 SharedDataRelocator<true> patcher((address*)patch_base, (address*)patch_end, valid_old_base, valid_old_end,
1638 valid_new_base, valid_new_end, addr_delta, ptrmap);
1639 ptrmap->iterate(&patcher);
1640 ArchivePtrMarker::compact(patcher.max_non_null_offset());
1641 }
1642 }
1643
1644 void VM_PopulateDumpSharedSpace::doit() {
1645 HeapShared::run_full_gc_in_vm_thread();
1646 CHeapBitMap ptrmap;
1647 MetaspaceShared::initialize_ptr_marker(&ptrmap);
1648
1649 // We should no longer allocate anything from the metaspace, so that:
1650 //
1651 // (1) Metaspace::allocate might trigger GC if we have run out of
1652 // committed metaspace, but we can't GC because we're running
1653 // in the VM thread.
1654 // (2) ArchiveCompactor needs to work with a stable set of MetaspaceObjs.
1655 Metaspace::freeze();
1656 DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
1657
1658 Thread* THREAD = VMThread::vm_thread();
1659
1660 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1661
1662 NOT_PRODUCT(SystemDictionary::verify();)
1663 // The following guarantee is meant to ensure that no loader constraints
1664 // exist yet, since the constraints table is not shared. This becomes
1665 // more important now that we don't re-initialize vtables/itables for
1666 // shared classes at runtime, where constraints were previously created.
1667 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1668 "loader constraints are not saved");
1669 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1670 "placeholders are not saved");
1671
1672 // At this point, many classes have been loaded.
1673 // Gather systemDictionary classes in a global array and do everything to
1674 // that so we don't have to walk the SystemDictionary again.
1675 SystemDictionaryShared::check_excluded_classes();
1676 _global_klass_objects = new GrowableArray<Klass*>(1000);
1677 CollectClassesClosure collect_classes;
1678 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1679 _global_klass_objects->sort(global_klass_compare);
1680
1681 print_class_stats();
1682
1683 // Ensure the ConstMethods won't be modified at run-time
1684 log_info(cds)("Updating ConstMethods ... ");
1685 rewrite_nofast_bytecodes_and_calculate_fingerprints(THREAD);
1686 log_info(cds)("done. ");
1687
1688 // Remove all references outside the metadata
1689 log_info(cds)("Removing unshareable information ... ");
1690 remove_unshareable_in_classes();
1691 log_info(cds)("done. ");
1692
1693 MetaspaceShared::allocate_cloned_cpp_vtptrs();
1694 char* cloned_vtables = _mc_region.top();
1695 MetaspaceShared::allocate_cpp_vtable_clones();
1696
1697 ArchiveCompactor::initialize();
1698 ArchiveCompactor::copy_and_compact();
1699
1700 dump_symbols();
1701
1702 // Dump supported java heap objects
1703 _closed_archive_heap_regions = NULL;
1704 _open_archive_heap_regions = NULL;
1705 dump_java_heap_objects();
1706
1707 ArchiveCompactor::relocate_well_known_klasses();
1708
1709 char* serialized_data = dump_read_only_tables();
1710 _ro_region.pack();
1711
1712 // The vtable clones contain addresses of the current process.
1713 // We don't want to write these addresses into the archive. Same for i2i buffer.
1714 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1715 memset(MetaspaceShared::i2i_entry_code_buffers(), 0,
1716 MetaspaceShared::i2i_entry_code_buffers_size());
1717
1718 // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
1719 // without runtime relocation.
1720 relocate_to_requested_base_address(&ptrmap);
1721
1722 // Create and write the archive file that maps the shared spaces.
1723
1724 FileMapInfo* mapinfo = new FileMapInfo(true);
1725 mapinfo->populate_header(os::vm_allocation_granularity());
1726 mapinfo->set_serialized_data(serialized_data);
1727 mapinfo->set_cloned_vtables(cloned_vtables);
1728 mapinfo->set_i2i_entry_code_buffers(MetaspaceShared::i2i_entry_code_buffers(),
1729 MetaspaceShared::i2i_entry_code_buffers_size());
1730 mapinfo->open_for_write();
1731 MetaspaceShared::write_core_archive_regions(mapinfo, _closed_archive_heap_oopmaps, _open_archive_heap_oopmaps);
1732 _total_closed_archive_region_size = mapinfo->write_archive_heap_regions(
1733 _closed_archive_heap_regions,
1734 _closed_archive_heap_oopmaps,
1735 MetaspaceShared::first_closed_archive_heap_region,
1736 MetaspaceShared::max_closed_archive_heap_region);
1737 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1738 _open_archive_heap_regions,
1739 _open_archive_heap_oopmaps,
1740 MetaspaceShared::first_open_archive_heap_region,
1741 MetaspaceShared::max_open_archive_heap_region);
1742
1743 mapinfo->set_final_requested_base((char*)MetaspaceShared::requested_base_address());
1744 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1745 mapinfo->write_header();
1746 print_region_stats(mapinfo);
1747 mapinfo->close();
1748
1749 if (log_is_enabled(Info, cds)) {
1750 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1751 int(_mc_region.used()));
1752 }
1753
1754 if (PrintSystemDictionaryAtExit) {
1755 SystemDictionary::print();
1756 }
1757
1758 if (AllowArchivingWithJavaAgent) {
1759 warning("This archive was created with AllowArchivingWithJavaAgent. It should be used "
1760 "for testing purposes only and should not be used in a production environment");
1761 }
1762
1763 // There may be other pending VM operations that operate on the InstanceKlasses,
1764 // which will fail because InstanceKlasses::remove_unshareable_info()
1765 // has been called. Forget these operations and exit the VM directly.
1766 vm_direct_exit(0);
1767 }
1768
1769 void VM_PopulateDumpSharedSpace::print_region_stats(FileMapInfo *map_info) {
1770 // Print statistics of all the regions
1771 const size_t bitmap_used = map_info->space_at(MetaspaceShared::bm)->used();
1772 const size_t bitmap_reserved = map_info->space_at(MetaspaceShared::bm)->used_aligned();
1773 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1774 _mc_region.reserved() +
1775 bitmap_reserved +
1776 _total_closed_archive_region_size +
1777 _total_open_archive_region_size;
1778 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1779 _mc_region.used() +
1780 bitmap_used +
1781 _total_closed_archive_region_size +
1782 _total_open_archive_region_size;
1783 const double total_u_perc = percent_of(total_bytes, total_reserved);
1784
1785 _mc_region.print(total_reserved);
1786 _rw_region.print(total_reserved);
1787 _ro_region.print(total_reserved);
1788 print_bitmap_region_stats(bitmap_used, total_reserved);
1789 print_heap_region_stats(_closed_archive_heap_regions, "ca", total_reserved);
1790 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1791
1792 log_debug(cds)("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1793 total_bytes, total_reserved, total_u_perc);
1794 }
1795
1796 void VM_PopulateDumpSharedSpace::print_bitmap_region_stats(size_t size, size_t total_size) {
1797 log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1798 size, size/double(total_size)*100.0, size);
1799 }
1800
1801 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1802 const char *name, size_t total_size) {
1803 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1804 for (int i = 0; i < arr_len; i++) {
1805 char* start = (char*)heap_mem->at(i).start();
1806 size_t size = heap_mem->at(i).byte_size();
1807 char* top = start + size;
1808 log_debug(cds)("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used] at " INTPTR_FORMAT,
1809 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1810
1811 }
1812 }
1813
1814 void MetaspaceShared::write_core_archive_regions(FileMapInfo* mapinfo,
1815 GrowableArray<ArchiveHeapOopmapInfo>* closed_oopmaps,
1816 GrowableArray<ArchiveHeapOopmapInfo>* open_oopmaps) {
1817 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1818 // MetaspaceShared::n_regions (internal to hotspot).
1819 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1820
1821 // mc contains the trampoline code for method entries, which are patched at run time,
1822 // so it needs to be read/write.
1823 write_region(mapinfo, mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1824 write_region(mapinfo, rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1825 write_region(mapinfo, ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1826 mapinfo->write_bitmap_region(ArchivePtrMarker::ptrmap(), closed_oopmaps, open_oopmaps);
1827 }
1828
1829 void MetaspaceShared::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1830 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1831 }
1832
1833 // Update a Java object to point its Klass* to the new location after
1834 // shared archive has been compacted.
1835 void MetaspaceShared::relocate_klass_ptr(oop o) {
1836 assert(DumpSharedSpaces, "sanity");
1837 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1838 o->set_klass(k);
1839 }
1840
1841 Klass* MetaspaceShared::get_relocated_klass(Klass *k, bool is_final) {
1842 assert(DumpSharedSpaces, "sanity");
1843 k = ArchiveCompactor::get_relocated_klass(k);
1844 if (is_final) {
1845 k = (Klass*)(address(k) + final_delta());
1846 }
1847 return k;
1848 }
1849
1850 Symbol* MetaspaceShared::get_relocated_symbol(Symbol* orig_symbol) {
1851 return ArchiveCompactor::get_relocated_symbol(orig_symbol);
1852 }
1853
1854 class LinkSharedClassesClosure : public KlassClosure {
1855 Thread* THREAD;
1856 bool _made_progress;
1857 public:
1858 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1859
1860 void reset() { _made_progress = false; }
1861 bool made_progress() const { return _made_progress; }
1862
1863 void do_klass(Klass* k) {
1864 if (k->is_instance_klass()) {
1865 InstanceKlass* ik = InstanceKlass::cast(k);
1866 // For dynamic CDS dump, only link classes loaded by the builtin class loaders.
1867 bool do_linking = DumpSharedSpaces ? true : !ik->is_shared_unregistered_class();
1868 if (do_linking) {
1869 // Link the class to cause the bytecodes to be rewritten and the
1870 // cpcache to be created. Class verification is done according
1871 // to -Xverify setting.
1872 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1873 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1874
1875 if (DumpSharedSpaces) {
1876 // The following function is used to resolve all Strings in the statically
1877 // dumped classes to archive all the Strings. The archive heap is not supported
1878 // for the dynamic archive.
1879 ik->constants()->resolve_class_constants(THREAD);
1880 }
1881 }
1882 }
1883 }
1884 };
1885
1886 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1887 // We need to iterate because verification may cause additional classes
1888 // to be loaded.
1889 LinkSharedClassesClosure link_closure(THREAD);
1890 do {
1891 link_closure.reset();
1892 ClassLoaderDataGraph::unlocked_loaded_classes_do(&link_closure);
1893 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1894 } while (link_closure.made_progress());
1895 }
1896
1897 void MetaspaceShared::prepare_for_dumping() {
1898 Arguments::check_unsupported_dumping_properties();
1899 ClassLoader::initialize_shared_path();
1900 }
1901
1902 // Preload classes from a list, populate the shared spaces and dump to a
1903 // file.
1904 void MetaspaceShared::preload_and_dump(TRAPS) {
1905 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1906 ResourceMark rm(THREAD);
1907 char class_list_path_str[JVM_MAXPATHLEN];
1908 // Preload classes to be shared.
1909 const char* class_list_path;
1910 if (SharedClassListFile == NULL) {
1911 // Construct the path to the class list (in jre/lib)
1912 // Walk up two directories from the location of the VM and
1913 // optionally tack on "lib" (depending on platform)
1914 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1915 for (int i = 0; i < 3; i++) {
1916 char *end = strrchr(class_list_path_str, *os::file_separator());
1917 if (end != NULL) *end = '\0';
1918 }
1919 int class_list_path_len = (int)strlen(class_list_path_str);
1920 if (class_list_path_len >= 3) {
1921 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1922 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1923 jio_snprintf(class_list_path_str + class_list_path_len,
1924 sizeof(class_list_path_str) - class_list_path_len,
1925 "%slib", os::file_separator());
1926 class_list_path_len += 4;
1927 }
1928 }
1929 }
1930 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1931 jio_snprintf(class_list_path_str + class_list_path_len,
1932 sizeof(class_list_path_str) - class_list_path_len,
1933 "%sclasslist", os::file_separator());
1934 }
1935 class_list_path = class_list_path_str;
1936 } else {
1937 class_list_path = SharedClassListFile;
1938 }
1939
1940 log_info(cds)("Loading classes to share ...");
1941 _has_error_classes = false;
1942 int class_count = preload_classes(class_list_path, THREAD);
1943 if (ExtraSharedClassListFile) {
1944 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1945 }
1946 log_info(cds)("Loading classes to share: done.");
1947
1948 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1949
1950 if (SharedArchiveConfigFile) {
1951 log_info(cds)("Reading extra data from %s ...", SharedArchiveConfigFile);
1952 read_extra_data(SharedArchiveConfigFile, THREAD);
1953 }
1954 log_info(cds)("Reading extra data: done.");
1955
1956 HeapShared::init_subgraph_entry_fields(THREAD);
1957
1958 // Rewrite and link classes
1959 log_info(cds)("Rewriting and linking classes ...");
1960
1961 // Link any classes which got missed. This would happen if we have loaded classes that
1962 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1963 // fails verification, all other interfaces that were not specified in the classlist but
1964 // are implemented by K are not verified.
1965 link_and_cleanup_shared_classes(CATCH);
1966 log_info(cds)("Rewriting and linking classes: done");
1967
1968 #if INCLUDE_CDS_JAVA_HEAP
1969 if (use_full_module_graph()) {
1970 HeapShared::reset_archived_object_states(THREAD);
1971 }
1972 #endif
1973
1974 VM_PopulateDumpSharedSpace op;
1975 MutexLocker ml(THREAD, HeapShared::is_heap_object_archiving_allowed() ?
1976 Heap_lock : NULL); // needed by HeapShared::run_gc()
1977 VMThread::execute(&op);
1978 }
1979 }
1980
1981
1982 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1983 ClassListParser parser(class_list_path);
1984 int class_count = 0;
1985
1986 while (parser.parse_one_line()) {
1987 Klass* klass = parser.load_current_class(THREAD);
1988 if (HAS_PENDING_EXCEPTION) {
1989 if (klass == NULL &&
1990 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1991 // print a warning only when the pending exception is class not found
1992 log_warning(cds)("Preload Warning: Cannot find %s", parser.current_class_name());
1993 }
1994 CLEAR_PENDING_EXCEPTION;
1995 }
1996 if (klass != NULL) {
1997 if (log_is_enabled(Trace, cds)) {
1998 ResourceMark rm(THREAD);
1999 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
2000 }
2001
2002 if (klass->is_instance_klass()) {
2003 InstanceKlass* ik = InstanceKlass::cast(klass);
2004
2005 // Link the class to cause the bytecodes to be rewritten and the
2006 // cpcache to be created. The linking is done as soon as classes
2007 // are loaded in order that the related data structures (klass and
2008 // cpCache) are located together.
2009 try_link_class(ik, THREAD);
2010 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
2011 }
2012
2013 class_count++;
2014 }
2015 }
2016
2017 return class_count;
2018 }
2019
2020 // Returns true if the class's status has changed
2021 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
2022 Arguments::assert_is_dumping_archive();
2023 if (ik->init_state() < InstanceKlass::linked &&
2024 !SystemDictionaryShared::has_class_failed_verification(ik)) {
2025 bool saved = BytecodeVerificationLocal;
2026 if (ik->is_shared_unregistered_class() && ik->class_loader() == NULL) {
2027 // The verification decision is based on BytecodeVerificationRemote
2028 // for non-system classes. Since we are using the NULL classloader
2029 // to load non-system classes for customized class loaders during dumping,
2030 // we need to temporarily change BytecodeVerificationLocal to be the same as
2031 // BytecodeVerificationRemote. Note this can cause the parent system
2032 // classes also being verified. The extra overhead is acceptable during
2033 // dumping.
2034 BytecodeVerificationLocal = BytecodeVerificationRemote;
2035 }
2036 ik->link_class(THREAD);
2037 if (HAS_PENDING_EXCEPTION) {
2038 ResourceMark rm(THREAD);
2039 log_warning(cds)("Preload Warning: Verification failed for %s",
2040 ik->external_name());
2041 CLEAR_PENDING_EXCEPTION;
2042 SystemDictionaryShared::set_class_has_failed_verification(ik);
2043 _has_error_classes = true;
2044 }
2045 BytecodeVerificationLocal = saved;
2046 return true;
2047 } else {
2048 return false;
2049 }
2050 }
2051
2052 #if INCLUDE_CDS_JAVA_HEAP
2053 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
2054 // The closed and open archive heap space has maximum two regions.
2055 // See FileMapInfo::write_archive_heap_regions() for details.
2056 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
2057 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
2058 HeapShared::archive_java_heap_objects(_closed_archive_heap_regions,
2059 _open_archive_heap_regions);
2060 ArchiveCompactor::OtherROAllocMark mark;
2061 HeapShared::write_subgraph_info_table();
2062 }
2063
2064 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
2065 if (HeapShared::is_heap_object_archiving_allowed()) {
2066 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
2067 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
2068
2069 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
2070 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
2071 }
2072 }
2073
2074 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
2075 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
2076 for (int i=0; i<regions->length(); i++) {
2077 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
2078 size_t size_in_bits = oopmap.size();
2079 size_t size_in_bytes = oopmap.size_in_bytes();
2080 uintptr_t* buffer = (uintptr_t*)NEW_C_HEAP_ARRAY(char, size_in_bytes, mtInternal);
2081 oopmap.write_to(buffer, size_in_bytes);
2082 log_info(cds, heap)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region "
2083 INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)",
2084 p2i(buffer), size_in_bytes,
2085 p2i(regions->at(i).start()), regions->at(i).byte_size());
2086
2087 ArchiveHeapOopmapInfo info;
2088 info._oopmap = (address)buffer;
2089 info._oopmap_size_in_bits = size_in_bits;
2090 info._oopmap_size_in_bytes = size_in_bytes;
2091 oopmaps->append(info);
2092 }
2093 }
2094 #endif // INCLUDE_CDS_JAVA_HEAP
2095
2096 void ReadClosure::do_ptr(void** p) {
2097 assert(*p == NULL, "initializing previous initialized pointer.");
2098 intptr_t obj = nextPtr();
2099 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
2100 "hit tag while initializing ptrs.");
2101 *p = (void*)obj;
2102 }
2103
2104 void ReadClosure::do_u4(u4* p) {
2105 intptr_t obj = nextPtr();
2106 *p = (u4)(uintx(obj));
2107 }
2108
2109 void ReadClosure::do_bool(bool* p) {
2110 intptr_t obj = nextPtr();
2111 *p = (bool)(uintx(obj));
2112 }
2113
2114 void ReadClosure::do_tag(int tag) {
2115 int old_tag;
2116 old_tag = (int)(intptr_t)nextPtr();
2117 // do_int(&old_tag);
2118 assert(tag == old_tag, "old tag doesn't match");
2119 FileMapInfo::assert_mark(tag == old_tag);
2120 }
2121
2122 void ReadClosure::do_oop(oop *p) {
2123 narrowOop o = (narrowOop)nextPtr();
2124 if (o == 0 || !HeapShared::open_archive_heap_region_mapped()) {
2125 *p = NULL;
2126 } else {
2127 assert(HeapShared::is_heap_object_archiving_allowed(),
2128 "Archived heap object is not allowed");
2129 assert(HeapShared::open_archive_heap_region_mapped(),
2130 "Open archive heap region is not mapped");
2131 *p = HeapShared::decode_from_archive(o);
2132 }
2133 }
2134
2135 void ReadClosure::do_region(u_char* start, size_t size) {
2136 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
2137 assert(size % sizeof(intptr_t) == 0, "bad size");
2138 do_tag((int)size);
2139 while (size > 0) {
2140 *(intptr_t*)start = nextPtr();
2141 start += sizeof(intptr_t);
2142 size -= sizeof(intptr_t);
2143 }
2144 }
2145
2146 void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
2147 assert(base <= static_top && static_top <= top, "must be");
2148 _shared_metaspace_static_top = static_top;
2149 MetaspaceObj::set_shared_metaspace_range(base, top);
2150 }
2151
2152 // Return true if given address is in the misc data region
2153 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
2154 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
2155 }
2156
2157 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
2158 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
2159 return true;
2160 }
2161 return false;
2162 }
2163
2164 bool MetaspaceShared::is_shared_dynamic(void* p) {
2165 if ((p < MetaspaceObj::shared_metaspace_top()) &&
2166 (p >= _shared_metaspace_static_top)) {
2167 return true;
2168 } else {
2169 return false;
2170 }
2171 }
2172
2173 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
2174 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
2175 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
2176
2177 FileMapInfo* static_mapinfo = open_static_archive();
2178 FileMapInfo* dynamic_mapinfo = NULL;
2179
2180 if (static_mapinfo != NULL) {
2181 dynamic_mapinfo = open_dynamic_archive();
2182
2183 // First try to map at the requested address
2184 result = map_archives(static_mapinfo, dynamic_mapinfo, true);
2185 if (result == MAP_ARCHIVE_MMAP_FAILURE) {
2186 // Mapping has failed (probably due to ASLR). Let's map at an address chosen
2187 // by the OS.
2188 log_info(cds)("Try to map archive(s) at an alternative address");
2189 result = map_archives(static_mapinfo, dynamic_mapinfo, false);
2190 }
2191 }
2192
2193 if (result == MAP_ARCHIVE_SUCCESS) {
2194 bool dynamic_mapped = (dynamic_mapinfo != NULL && dynamic_mapinfo->is_mapped());
2195 char* cds_base = static_mapinfo->mapped_base();
2196 char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
2197 set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
2198 _relocation_delta = static_mapinfo->relocation_delta();
2199 if (dynamic_mapped) {
2200 FileMapInfo::set_shared_path_table(dynamic_mapinfo);
2201 } else {
2202 FileMapInfo::set_shared_path_table(static_mapinfo);
2203 }
2204 _requested_base_address = static_mapinfo->requested_base_address();
2205 } else {
2206 set_shared_metaspace_range(NULL, NULL, NULL);
2207 UseSharedSpaces = false;
2208 FileMapInfo::fail_continue("Unable to map shared spaces");
2209 if (PrintSharedArchiveAndExit) {
2210 vm_exit_during_initialization("Unable to use shared archive.");
2211 }
2212 }
2213
2214 if (static_mapinfo != NULL && !static_mapinfo->is_mapped()) {
2215 delete static_mapinfo;
2216 }
2217 if (dynamic_mapinfo != NULL && !dynamic_mapinfo->is_mapped()) {
2218 delete dynamic_mapinfo;
2219 }
2220 }
2221
2222 FileMapInfo* MetaspaceShared::open_static_archive() {
2223 FileMapInfo* mapinfo = new FileMapInfo(true);
2224 if (!mapinfo->initialize()) {
2225 delete(mapinfo);
2226 return NULL;
2227 }
2228 return mapinfo;
2229 }
2230
2231 FileMapInfo* MetaspaceShared::open_dynamic_archive() {
2232 if (DynamicDumpSharedSpaces) {
2233 return NULL;
2234 }
2235 if (Arguments::GetSharedDynamicArchivePath() == NULL) {
2236 return NULL;
2237 }
2238
2239 FileMapInfo* mapinfo = new FileMapInfo(false);
2240 if (!mapinfo->initialize()) {
2241 delete(mapinfo);
2242 return NULL;
2243 }
2244 return mapinfo;
2245 }
2246
2247 // use_requested_addr:
2248 // true = map at FileMapHeader::_requested_base_address
2249 // false = map at an alternative address picked by OS.
2250 MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
2251 bool use_requested_addr) {
2252 if (use_requested_addr && static_mapinfo->requested_base_address() == NULL) {
2253 log_info(cds)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
2254 return MAP_ARCHIVE_MMAP_FAILURE;
2255 }
2256
2257 PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
2258 // For product build only -- this is for benchmarking the cost of doing relocation.
2259 // For debug builds, the check is done below, after reserving the space, for better test coverage
2260 // (see comment below).
2261 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
2262 return MAP_ARCHIVE_MMAP_FAILURE;
2263 });
2264
2265 if (ArchiveRelocationMode == 2 && !use_requested_addr) {
2266 log_info(cds)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
2267 return MAP_ARCHIVE_MMAP_FAILURE;
2268 };
2269
2270 if (dynamic_mapinfo != NULL) {
2271 // Ensure that the OS won't be able to allocate new memory spaces between the two
2272 // archives, or else it would mess up the simple comparision in MetaspaceObj::is_shared().
2273 assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
2274 }
2275
2276 ReservedSpace archive_space_rs, class_space_rs;
2277 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
2278 char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo, dynamic_mapinfo,
2279 use_requested_addr, archive_space_rs,
2280 class_space_rs);
2281 if (mapped_base_address == NULL) {
2282 result = MAP_ARCHIVE_MMAP_FAILURE;
2283 log_debug(cds)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
2284 } else {
2285
2286 #ifdef ASSERT
2287 // Some sanity checks after reserving address spaces for archives
2288 // and class space.
2289 assert(archive_space_rs.is_reserved(), "Sanity");
2290 if (Metaspace::using_class_space()) {
2291 // Class space must closely follow the archive space. Both spaces
2292 // must be aligned correctly.
2293 assert(class_space_rs.is_reserved(),
2294 "A class space should have been reserved");
2295 assert(class_space_rs.base() >= archive_space_rs.end(),
2296 "class space should follow the cds archive space");
2297 assert(is_aligned(archive_space_rs.base(),
2298 MetaspaceShared::reserved_space_alignment()),
2299 "Archive space misaligned");
2300 assert(is_aligned(class_space_rs.base(),
2301 Metaspace::reserve_alignment()),
2302 "class space misaligned");
2303 }
2304 #endif // ASSERT
2305
2306 log_debug(cds)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
2307 p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size());
2308 log_debug(cds)("Reserved class_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
2309 p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
2310
2311 if (MetaspaceShared::use_windows_memory_mapping()) {
2312 // We have now reserved address space for the archives, and will map in
2313 // the archive files into this space.
2314 //
2315 // Special handling for Windows: on Windows we cannot map a file view
2316 // into an existing memory mapping. So, we unmap the address range we
2317 // just reserved again, which will make it available for mapping the
2318 // archives.
2319 // Reserving this range has not been for naught however since it makes
2320 // us reasonably sure the address range is available.
2321 //
2322 // But still it may fail, since between unmapping the range and mapping
2323 // in the archive someone else may grab the address space. Therefore
2324 // there is a fallback in FileMap::map_region() where we just read in
2325 // the archive files sequentially instead of mapping it in. We couple
2326 // this with use_requested_addr, since we're going to patch all the
2327 // pointers anyway so there's no benefit to mmap.
2328 if (use_requested_addr) {
2329 log_info(cds)("Windows mmap workaround: releasing archive space.");
2330 archive_space_rs.release();
2331 }
2332 }
2333 MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
2334 MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
2335 map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
2336
2337 DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
2338 // This is for simulating mmap failures at the requested address. In
2339 // debug builds, we do it here (after all archives have possibly been
2340 // mapped), so we can thoroughly test the code for failure handling
2341 // (releasing all allocated resource, etc).
2342 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
2343 if (static_result == MAP_ARCHIVE_SUCCESS) {
2344 static_result = MAP_ARCHIVE_MMAP_FAILURE;
2345 }
2346 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
2347 dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
2348 }
2349 });
2350
2351 if (static_result == MAP_ARCHIVE_SUCCESS) {
2352 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
2353 result = MAP_ARCHIVE_SUCCESS;
2354 } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
2355 assert(dynamic_mapinfo != NULL && !dynamic_mapinfo->is_mapped(), "must have failed");
2356 // No need to retry mapping the dynamic archive again, as it will never succeed
2357 // (bad file, etc) -- just keep the base archive.
2358 log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
2359 dynamic_mapinfo->full_path());
2360 result = MAP_ARCHIVE_SUCCESS;
2361 // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
2362 // easy API to do that right now.
2363 } else {
2364 result = MAP_ARCHIVE_MMAP_FAILURE;
2365 }
2366 } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
2367 result = MAP_ARCHIVE_OTHER_FAILURE;
2368 } else {
2369 result = MAP_ARCHIVE_MMAP_FAILURE;
2370 }
2371 }
2372
2373 if (result == MAP_ARCHIVE_SUCCESS) {
2374 SharedBaseAddress = (size_t)mapped_base_address;
2375 LP64_ONLY({
2376 if (Metaspace::using_class_space()) {
2377 // Set up ccs in metaspace.
2378 Metaspace::initialize_class_space(class_space_rs);
2379
2380 // Set up compressed Klass pointer encoding: the encoding range must
2381 // cover both archive and class space.
2382 address cds_base = (address)static_mapinfo->mapped_base();
2383 address ccs_end = (address)class_space_rs.end();
2384 CompressedKlassPointers::initialize(cds_base, ccs_end - cds_base);
2385
2386 // map_heap_regions() compares the current narrow oop and klass encodings
2387 // with the archived ones, so it must be done after all encodings are determined.
2388 static_mapinfo->map_heap_regions();
2389 }
2390 });
2391 log_info(cds)("optimized module handling: %s", MetaspaceShared::use_optimized_module_handling() ? "enabled" : "disabled");
2392 log_info(cds)("full module graph: %s", MetaspaceShared::use_full_module_graph() ? "enabled" : "disabled");
2393 } else {
2394 unmap_archive(static_mapinfo);
2395 unmap_archive(dynamic_mapinfo);
2396 release_reserved_spaces(archive_space_rs, class_space_rs);
2397 }
2398
2399 return result;
2400 }
2401
2402
2403 // This will reserve two address spaces suitable to house Klass structures, one
2404 // for the cds archives (static archive and optionally dynamic archive) and
2405 // optionally one move for ccs.
2406 //
2407 // Since both spaces must fall within the compressed class pointer encoding
2408 // range, they are allocated close to each other.
2409 //
2410 // Space for archives will be reserved first, followed by a potential gap,
2411 // followed by the space for ccs:
2412 //
2413 // +-- Base address A B End
2414 // | | | |
2415 // v v v v
2416 // +-------------+--------------+ +----------------------+
2417 // | static arc | [dyn. arch] | [gap] | compr. class space |
2418 // +-------------+--------------+ +----------------------+
2419 //
2420 // (The gap may result from different alignment requirements between metaspace
2421 // and CDS)
2422 //
2423 // If UseCompressedClassPointers is disabled, only one address space will be
2424 // reserved:
2425 //
2426 // +-- Base address End
2427 // | |
2428 // v v
2429 // +-------------+--------------+
2430 // | static arc | [dyn. arch] |
2431 // +-------------+--------------+
2432 //
2433 // Base address: If use_archive_base_addr address is true, the Base address is
2434 // determined by the address stored in the static archive. If
2435 // use_archive_base_addr address is false, this base address is determined
2436 // by the platform.
2437 //
2438 // If UseCompressedClassPointers=1, the range encompassing both spaces will be
2439 // suitable to en/decode narrow Klass pointers: the base will be valid for
2440 // encoding, the range [Base, End) not surpass KlassEncodingMetaspaceMax.
2441 //
2442 // Return:
2443 //
2444 // - On success:
2445 // - archive_space_rs will be reserved and large enough to host static and
2446 // if needed dynamic archive: [Base, A).
2447 // archive_space_rs.base and size will be aligned to CDS reserve
2448 // granularity.
2449 // - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
2450 // be reserved. Its start address will be aligned to metaspace reserve
2451 // alignment, which may differ from CDS alignment. It will follow the cds
2452 // archive space, close enough such that narrow class pointer encoding
2453 // covers both spaces.
2454 // If UseCompressedClassPointers=0, class_space_rs remains unreserved.
2455 // - On error: NULL is returned and the spaces remain unreserved.
2456 char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
2457 FileMapInfo* dynamic_mapinfo,
2458 bool use_archive_base_addr,
2459 ReservedSpace& archive_space_rs,
2460 ReservedSpace& class_space_rs) {
2461
2462 address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : NULL);
2463 const size_t archive_space_alignment = MetaspaceShared::reserved_space_alignment();
2464
2465 // Size and requested location of the archive_space_rs (for both static and dynamic archives)
2466 assert(static_mapinfo->mapping_base_offset() == 0, "Must be");
2467 size_t archive_end_offset = (dynamic_mapinfo == NULL) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
2468 size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
2469
2470 // If a base address is given, it must have valid alignment and be suitable as encoding base.
2471 if (base_address != NULL) {
2472 assert(is_aligned(base_address, archive_space_alignment),
2473 "Archive base address invalid: " PTR_FORMAT ".", p2i(base_address));
2474 if (Metaspace::using_class_space()) {
2475 assert(CompressedKlassPointers::is_valid_base(base_address),
2476 "Archive base address invalid: " PTR_FORMAT ".", p2i(base_address));
2477 }
2478 }
2479
2480 if (!Metaspace::using_class_space()) {
2481 // Get the simple case out of the way first:
2482 // no compressed class space, simple allocation.
2483 archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
2484 false /* bool large */, (char*)base_address);
2485 if (archive_space_rs.is_reserved()) {
2486 assert(base_address == NULL ||
2487 (address)archive_space_rs.base() == base_address, "Sanity");
2488 // Register archive space with NMT.
2489 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
2490 return archive_space_rs.base();
2491 }
2492 return NULL;
2493 }
2494
2495 #ifdef _LP64
2496
2497 // Complex case: two spaces adjacent to each other, both to be addressable
2498 // with narrow class pointers.
2499 // We reserve the whole range spanning both spaces, then split that range up.
2500
2501 const size_t class_space_alignment = Metaspace::reserve_alignment();
2502
2503 // To simplify matters, lets assume that metaspace alignment will always be
2504 // equal or a multiple of archive alignment.
2505 assert(is_power_of_2(class_space_alignment) &&
2506 is_power_of_2(archive_space_alignment) &&
2507 class_space_alignment >= archive_space_alignment,
2508 "Sanity");
2509
2510 const size_t class_space_size = CompressedClassSpaceSize;
2511 assert(CompressedClassSpaceSize > 0 &&
2512 is_aligned(CompressedClassSpaceSize, class_space_alignment),
2513 "CompressedClassSpaceSize malformed: "
2514 SIZE_FORMAT, CompressedClassSpaceSize);
2515
2516 const size_t ccs_begin_offset = align_up(base_address + archive_space_size,
2517 class_space_alignment) - base_address;
2518 const size_t gap_size = ccs_begin_offset - archive_space_size;
2519
2520 const size_t total_range_size =
2521 align_up(archive_space_size + gap_size + class_space_size,
2522 os::vm_allocation_granularity());
2523
2524 ReservedSpace total_rs;
2525 if (base_address != NULL) {
2526 // Reserve at the given archive base address, or not at all.
2527 total_rs = ReservedSpace(total_range_size, archive_space_alignment,
2528 false /* bool large */, (char*) base_address);
2529 } else {
2530 // Reserve at any address, but leave it up to the platform to choose a good one.
2531 total_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size);
2532 }
2533
2534 if (!total_rs.is_reserved()) {
2535 return NULL;
2536 }
2537
2538 // Paranoid checks:
2539 assert(base_address == NULL || (address)total_rs.base() == base_address,
2540 "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_rs.base()));
2541 assert(is_aligned(total_rs.base(), archive_space_alignment), "Sanity");
2542 assert(total_rs.size() == total_range_size, "Sanity");
2543 assert(CompressedKlassPointers::is_valid_base((address)total_rs.base()), "Sanity");
2544
2545 // Now split up the space into ccs and cds archive. For simplicity, just leave
2546 // the gap reserved at the end of the archive space.
2547 archive_space_rs = total_rs.first_part(ccs_begin_offset,
2548 (size_t)os::vm_allocation_granularity(),
2549 /*split=*/true);
2550 class_space_rs = total_rs.last_part(ccs_begin_offset);
2551
2552 assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
2553 assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
2554 assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
2555 assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
2556
2557 // NMT: fix up the space tags
2558 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
2559 MemTracker::record_virtual_memory_type(class_space_rs.base(), mtClass);
2560
2561 return archive_space_rs.base();
2562
2563 #else
2564 ShouldNotReachHere();
2565 return NULL;
2566 #endif
2567
2568 }
2569
2570 void MetaspaceShared::release_reserved_spaces(ReservedSpace& archive_space_rs,
2571 ReservedSpace& class_space_rs) {
2572 if (archive_space_rs.is_reserved()) {
2573 log_debug(cds)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
2574 archive_space_rs.release();
2575 }
2576 if (class_space_rs.is_reserved()) {
2577 log_debug(cds)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
2578 class_space_rs.release();
2579 }
2580 }
2581
2582 static int archive_regions[] = {MetaspaceShared::mc,
2583 MetaspaceShared::rw,
2584 MetaspaceShared::ro};
2585 static int archive_regions_count = 3;
2586
2587 MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
2588 assert(UseSharedSpaces, "must be runtime");
2589 if (mapinfo == NULL) {
2590 return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
2591 }
2592
2593 mapinfo->set_is_mapped(false);
2594
2595 if (mapinfo->alignment() != (size_t)os::vm_allocation_granularity()) {
2596 log_error(cds)("Unable to map CDS archive -- os::vm_allocation_granularity() expected: " SIZE_FORMAT
2597 " actual: %d", mapinfo->alignment(), os::vm_allocation_granularity());
2598 return MAP_ARCHIVE_OTHER_FAILURE;
2599 }
2600
2601 MapArchiveResult result =
2602 mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
2603
2604 if (result != MAP_ARCHIVE_SUCCESS) {
2605 unmap_archive(mapinfo);
2606 return result;
2607 }
2608
2609 if (!mapinfo->validate_shared_path_table()) {
2610 unmap_archive(mapinfo);
2611 return MAP_ARCHIVE_OTHER_FAILURE;
2612 }
2613
2614 mapinfo->set_is_mapped(true);
2615 return MAP_ARCHIVE_SUCCESS;
2616 }
2617
2618 void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
2619 assert(UseSharedSpaces, "must be runtime");
2620 if (mapinfo != NULL) {
2621 mapinfo->unmap_regions(archive_regions, archive_regions_count);
2622 mapinfo->set_is_mapped(false);
2623 }
2624 }
2625
2626 // Read the miscellaneous data from the shared file, and
2627 // serialize it out to its various destinations.
2628
2629 void MetaspaceShared::initialize_shared_spaces() {
2630 FileMapInfo *static_mapinfo = FileMapInfo::current_info();
2631 _i2i_entry_code_buffers = static_mapinfo->i2i_entry_code_buffers();
2632 _i2i_entry_code_buffers_size = static_mapinfo->i2i_entry_code_buffers_size();
2633 char* buffer = static_mapinfo->cloned_vtables();
2634 clone_cpp_vtables((intptr_t*)buffer);
2635
2636 // Verify various attributes of the archive, plus initialize the
2637 // shared string/symbol tables
2638 buffer = static_mapinfo->serialized_data();
2639 intptr_t* array = (intptr_t*)buffer;
2640 ReadClosure rc(&array);
2641 serialize(&rc);
2642
2643 // Initialize the run-time symbol table.
2644 SymbolTable::create_table();
2645
2646 static_mapinfo->patch_archived_heap_embedded_pointers();
2647
2648 // Close the mapinfo file
2649 static_mapinfo->close();
2650
2651 static_mapinfo->unmap_region(MetaspaceShared::bm);
2652
2653 FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
2654 if (dynamic_mapinfo != NULL) {
2655 intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
2656 ReadClosure rc(&buffer);
2657 SymbolTable::serialize_shared_table_header(&rc, false);
2658 SystemDictionaryShared::serialize_dictionary_headers(&rc, false);
2659 dynamic_mapinfo->close();
2660 }
2661
2662 if (PrintSharedArchiveAndExit) {
2663 if (PrintSharedDictionary) {
2664 tty->print_cr("\nShared classes:\n");
2665 SystemDictionaryShared::print_on(tty);
2666 }
2667 if (FileMapInfo::current_info() == NULL || _archive_loading_failed) {
2668 tty->print_cr("archive is invalid");
2669 vm_exit(1);
2670 } else {
2671 tty->print_cr("archive is valid");
2672 vm_exit(0);
2673 }
2674 }
2675 }
2676
2677 // JVM/TI RedefineClasses() support:
2678 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2679 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2680
2681 if (UseSharedSpaces) {
2682 // remap the shared readonly space to shared readwrite, private
2683 FileMapInfo* mapinfo = FileMapInfo::current_info();
2684 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2685 return false;
2686 }
2687 if (FileMapInfo::dynamic_info() != NULL) {
2688 mapinfo = FileMapInfo::dynamic_info();
2689 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2690 return false;
2691 }
2692 }
2693 _remapped_readwrite = true;
2694 }
2695 return true;
2696 }
2697
2698 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2699 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2700 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2701 // or so.
2702 _mc_region.print_out_of_space_msg(name, needed_bytes);
2703 _rw_region.print_out_of_space_msg(name, needed_bytes);
2704 _ro_region.print_out_of_space_msg(name, needed_bytes);
2705
2706 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2707 "Please reduce the number of shared classes.");
2708 }
2709
2710 // This is used to relocate the pointers so that the base archive can be mapped at
2711 // MetaspaceShared::requested_base_address() without runtime relocation.
2712 intx MetaspaceShared::final_delta() {
2713 return intx(MetaspaceShared::requested_base_address()) // We want the base archive to be mapped to here at runtime
2714 - intx(SharedBaseAddress); // .. but the base archive is mapped at here at dump time
2715 }
2716
2717 bool MetaspaceShared::use_full_module_graph() {
2718 return _use_optimized_module_handling && _use_full_module_graph &&
2719 (UseSharedSpaces || DumpSharedSpaces) && HeapShared::is_heap_object_archiving_allowed();
2720 }
2721
2722 void MetaspaceShared::print_on(outputStream* st) {
2723 if (UseSharedSpaces || DumpSharedSpaces) {
2724 st->print("CDS archive(s) mapped at: ");
2725 address base;
2726 address top;
2727 if (UseSharedSpaces) { // Runtime
2728 base = (address)MetaspaceObj::shared_metaspace_base();
2729 address static_top = (address)_shared_metaspace_static_top;
2730 top = (address)MetaspaceObj::shared_metaspace_top();
2731 st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
2732 } else if (DumpSharedSpaces) { // Dump Time
2733 base = (address)_shared_rs.base();
2734 top = (address)_shared_rs.end();
2735 st->print("[" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(top));
2736 }
2737 st->print("size " SIZE_FORMAT ", ", top - base);
2738 st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, (int)ArchiveRelocationMode);
2739 } else {
2740 st->print("CDS disabled.");
2741 }
2742 st->cr();
2743 }