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/classListParser.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/dictionary.hpp"
31 #include "classfile/loaderConstraints.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/placeholders.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "code/codeCache.hpp"
39 #include "gc/shared/softRefPolicy.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/bytecodes.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logMessage.hpp"
44 #include "memory/archiveUtils.inline.hpp"
45 #include "memory/dynamicArchive.hpp"
46 #include "memory/filemap.hpp"
47 #include "memory/heapShared.inline.hpp"
48 #include "memory/metaspace.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/metaspaceShared.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "oops/compressedOops.inline.hpp"
54 #include "oops/instanceClassLoaderKlass.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/instanceRefKlass.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/typeArrayKlass.hpp"
62 #include "prims/jvmtiRedefineClasses.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/timerTrace.hpp"
68 #include "runtime/vmThread.hpp"
69 #include "runtime/vmOperations.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/bitMap.inline.hpp"
72 #include "utilities/ostream.hpp"
73 #include "utilities/defaultStream.hpp"
74 #include "utilities/hashtable.inline.hpp"
75 #if INCLUDE_G1GC
76 #include "gc/g1/g1CollectedHeap.hpp"
77 #endif
78
79 ReservedSpace MetaspaceShared::_shared_rs;
80 VirtualSpace MetaspaceShared::_shared_vs;
81 ReservedSpace MetaspaceShared::_symbol_rs;
82 VirtualSpace MetaspaceShared::_symbol_vs;
83 MetaspaceSharedStats MetaspaceShared::_stats;
84 bool MetaspaceShared::_has_error_classes;
85 bool MetaspaceShared::_archive_loading_failed = false;
86 bool MetaspaceShared::_remapped_readwrite = false;
87 address MetaspaceShared::_i2i_entry_code_buffers = NULL;
88 size_t MetaspaceShared::_i2i_entry_code_buffers_size = 0;
89 void* MetaspaceShared::_shared_metaspace_static_top = NULL;
90 intx MetaspaceShared::_relocation_delta;
91 char* MetaspaceShared::_requested_base_address;
92 bool MetaspaceShared::_use_optimized_module_handling = true;
93 bool MetaspaceShared::_use_full_module_graph = true;
94
95 // The CDS archive is divided into the following regions:
96 // mc - misc code (the method entry trampolines, c++ vtables)
97 // rw - read-write metadata
98 // ro - read-only metadata and read-only tables
99 //
100 // ca0 - closed archive heap space #0
101 // ca1 - closed archive heap space #1 (may be empty)
102 // oa0 - open archive heap space #0
103 // oa1 - open archive heap space #1 (may be empty)
104 //
105 // The mc, rw, and ro regions are linearly allocated, starting from
106 // SharedBaseAddress, in the order of mc->rw->ro. The size of these 3 regions
107 // are page-aligned, and there's no gap between any consecutive regions.
108 //
109 // These 3 regions are populated in the following steps:
110 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
111 // temporarily allocated outside of the shared regions. Only the method entry
112 // trampolines are written into the mc region.
113 // [2] C++ vtables are copied into the mc region.
114 // [3] ArchiveCompactor copies RW metadata into the rw region.
115 // [4] ArchiveCompactor copies RO metadata into the ro region.
116 // [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
117 // are copied into the ro region as read-only tables.
118 //
119 // The s0/s1 and oa0/oa1 regions are populated inside HeapShared::archive_java_heap_objects.
120 // Their layout is independent of the other 4 regions.
121
122 char* DumpRegion::expand_top_to(char* newtop) {
123 assert(is_allocatable(), "must be initialized and not packed");
124 assert(newtop >= _top, "must not grow backwards");
125 if (newtop > _end) {
126 MetaspaceShared::report_out_of_space(_name, newtop - _top);
127 ShouldNotReachHere();
128 }
129
130 if (_rs == MetaspaceShared::shared_rs()) {
131 uintx delta;
132 if (DynamicDumpSharedSpaces) {
133 delta = DynamicArchive::object_delta_uintx(newtop);
134 } else {
135 delta = MetaspaceShared::object_delta_uintx(newtop);
136 }
137 if (delta > MAX_SHARED_DELTA) {
138 // This is just a sanity check and should not appear in any real world usage. This
139 // happens only if you allocate more than 2GB of shared objects and would require
140 // millions of shared classes.
141 vm_exit_during_initialization("Out of memory in the CDS archive",
142 "Please reduce the number of shared classes.");
143 }
144 }
145
146 MetaspaceShared::commit_to(_rs, _vs, newtop);
147 _top = newtop;
148 return _top;
149 }
150
151 char* DumpRegion::allocate(size_t num_bytes, size_t alignment) {
152 char* p = (char*)align_up(_top, alignment);
153 char* newtop = p + align_up(num_bytes, alignment);
154 expand_top_to(newtop);
155 memset(p, 0, newtop - p);
156 return p;
157 }
158
159 void DumpRegion::append_intptr_t(intptr_t n, bool need_to_mark) {
160 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
161 intptr_t *p = (intptr_t*)_top;
162 char* newtop = _top + sizeof(intptr_t);
163 expand_top_to(newtop);
164 *p = n;
165 if (need_to_mark) {
166 ArchivePtrMarker::mark_pointer(p);
167 }
168 }
169
170 void DumpRegion::print(size_t total_bytes) const {
171 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,
172 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()),
173 p2i(_base + MetaspaceShared::final_delta()));
174 }
175
176 void DumpRegion::print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
177 log_error(cds)("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
178 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
179 if (strcmp(_name, failing_region) == 0) {
180 log_error(cds)(" required = %d", int(needed_bytes));
181 }
182 }
183
184 void DumpRegion::init(ReservedSpace* rs, VirtualSpace* vs) {
185 _rs = rs;
186 _vs = vs;
187 // Start with 0 committed bytes. The memory will be committed as needed by
188 // MetaspaceShared::commit_to().
189 if (!_vs->initialize(*_rs, 0)) {
190 fatal("Unable to allocate memory for shared space");
191 }
192 _base = _top = _rs->base();
193 _end = _rs->end();
194 }
195
196 void DumpRegion::pack(DumpRegion* next) {
197 assert(!is_packed(), "sanity");
198 _end = (char*)align_up(_top, MetaspaceShared::reserved_space_alignment());
199 _is_packed = true;
200 if (next != NULL) {
201 next->_rs = _rs;
202 next->_vs = _vs;
203 next->_base = next->_top = this->_end;
204 next->_end = _rs->end();
205 }
206 }
207
208 static DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _symbol_region("symbols");
209 static size_t _total_closed_archive_region_size = 0, _total_open_archive_region_size = 0;
210
211 void MetaspaceShared::init_shared_dump_space(DumpRegion* first_space) {
212 first_space->init(&_shared_rs, &_shared_vs);
213 }
214
215 DumpRegion* MetaspaceShared::misc_code_dump_space() {
216 return &_mc_region;
217 }
218
219 DumpRegion* MetaspaceShared::read_write_dump_space() {
220 return &_rw_region;
221 }
222
223 DumpRegion* MetaspaceShared::read_only_dump_space() {
224 return &_ro_region;
225 }
226
227 void MetaspaceShared::pack_dump_space(DumpRegion* current, DumpRegion* next,
228 ReservedSpace* rs) {
229 current->pack(next);
230 }
231
232 char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
233 return _symbol_region.allocate(num_bytes);
234 }
235
236 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
237 return _mc_region.allocate(num_bytes);
238 }
239
240 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
241 return _ro_region.allocate(num_bytes);
242 }
243
244 char* MetaspaceShared::read_write_space_alloc(size_t num_bytes) {
245 return _rw_region.allocate(num_bytes);
246 }
247
248 size_t MetaspaceShared::reserved_space_alignment() { return os::vm_allocation_granularity(); }
249
250 static bool shared_base_valid(char* shared_base) {
251 #ifdef _LP64
252 return CompressedKlassPointers::is_valid_base((address)shared_base);
253 #else
254 return true;
255 #endif
256 }
257
258 static bool shared_base_too_high(char* shared_base, size_t cds_total) {
259 if (SharedBaseAddress != 0 && shared_base < (char*)SharedBaseAddress) {
260 // SharedBaseAddress is very high (e.g., 0xffffffffffffff00) so
261 // align_up(SharedBaseAddress, MetaspaceShared::reserved_space_alignment()) has wrapped around.
262 return true;
263 }
264 if (max_uintx - uintx(shared_base) < uintx(cds_total)) {
265 // The end of the archive will wrap around
266 return true;
267 }
268
269 return false;
270 }
271
272 static char* compute_shared_base(size_t cds_total) {
273 char* shared_base = (char*)align_up((char*)SharedBaseAddress, MetaspaceShared::reserved_space_alignment());
274 const char* err = NULL;
275 if (shared_base_too_high(shared_base, cds_total)) {
276 err = "too high";
277 } else if (!shared_base_valid(shared_base)) {
278 err = "invalid for this platform";
279 }
280 if (err) {
281 log_warning(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
282 p2i((void*)SharedBaseAddress), err,
283 p2i((void*)Arguments::default_SharedBaseAddress()));
284 SharedBaseAddress = Arguments::default_SharedBaseAddress();
285 shared_base = (char*)align_up((char*)SharedBaseAddress, MetaspaceShared::reserved_space_alignment());
286 }
287 assert(!shared_base_too_high(shared_base, cds_total) && shared_base_valid(shared_base), "Sanity");
288 return shared_base;
289 }
290
291 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() {
292 assert(DumpSharedSpaces, "should be called for dump time only");
293
294 const size_t reserve_alignment = MetaspaceShared::reserved_space_alignment();
295
296 #ifdef _LP64
297 // On 64-bit VM we reserve a 4G range and, if UseCompressedClassPointers=1,
298 // will use that to house both the archives and the ccs. See below for
299 // details.
300 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
301 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
302 #else
303 // We don't support archives larger than 256MB on 32-bit due to limited
304 // virtual address space.
305 size_t cds_total = align_down(256*M, reserve_alignment);
306 #endif
307
308 char* shared_base = compute_shared_base(cds_total);
309 _requested_base_address = shared_base;
310
311 // Whether to use SharedBaseAddress as attach address.
312 bool use_requested_base = true;
313
314 if (shared_base == NULL) {
315 use_requested_base = false;
316 }
317
318 if (ArchiveRelocationMode == 1) {
319 log_info(cds)("ArchiveRelocationMode == 1: always allocate class space at an alternative address");
320 use_requested_base = false;
321 }
322
323 // First try to reserve the space at the specified SharedBaseAddress.
324 assert(!_shared_rs.is_reserved(), "must be");
325 if (use_requested_base) {
326 _shared_rs = ReservedSpace(cds_total, reserve_alignment,
327 false /* large */, (char*)shared_base);
328 if (_shared_rs.is_reserved()) {
329 assert(_shared_rs.base() == shared_base, "should match");
330 } else {
331 log_info(cds)("dumptime space reservation: failed to map at "
332 "SharedBaseAddress " PTR_FORMAT, p2i(shared_base));
333 }
334 }
335 if (!_shared_rs.is_reserved()) {
336 // Get a reserved space anywhere if attaching at the SharedBaseAddress
337 // fails:
338 if (UseCompressedClassPointers) {
339 // If we need to reserve class space as well, let the platform handle
340 // the reservation.
341 LP64_ONLY(_shared_rs =
342 Metaspace::reserve_address_space_for_compressed_classes(cds_total);)
343 NOT_LP64(ShouldNotReachHere();)
344 } else {
345 // anywhere is fine.
346 _shared_rs = ReservedSpace(cds_total, reserve_alignment,
347 false /* large */, (char*)NULL);
348 }
349 }
350
351 if (!_shared_rs.is_reserved()) {
352 vm_exit_during_initialization("Unable to reserve memory for shared space",
353 err_msg(SIZE_FORMAT " bytes.", cds_total));
354 }
355
356 #ifdef _LP64
357
358 if (UseCompressedClassPointers) {
359
360 assert(CompressedKlassPointers::is_valid_base((address)_shared_rs.base()), "Sanity");
361
362 // On 64-bit VM, if UseCompressedClassPointers=1, the compressed class space
363 // must be allocated near the cds such as that the compressed Klass pointer
364 // encoding can be used to en/decode pointers from both cds and ccs. Since
365 // Metaspace cannot do this (it knows nothing about cds), we do it for
366 // Metaspace here and pass it the space to use for ccs.
367 //
368 // We do this by reserving space for the ccs behind the archives. Note
369 // however that ccs follows a different alignment
370 // (Metaspace::reserve_alignment), so there may be a gap between ccs and
371 // cds.
372 // We use a similar layout at runtime, see reserve_address_space_for_archives().
373 //
374 // +-- SharedBaseAddress (default = 0x800000000)
375 // v
376 // +-..---------+---------+ ... +----+----+----+--------+-----------------+
377 // | Heap | Archive | | MC | RW | RO | [gap] | class space |
378 // +-..---------+---------+ ... +----+----+----+--------+-----------------+
379 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB -->|
380 //
381 // Note: ccs must follow the archives, and the archives must start at the
382 // encoding base. However, the exact placement of ccs does not matter as
383 // long as it it resides in the encoding range of CompressedKlassPointers
384 // and comes after the archive.
385 //
386 // We do this by splitting up the allocated 4G into 3G of archive space,
387 // followed by 1G for the ccs:
388 // + The upper 1 GB is used as the "temporary compressed class space"
389 // -- preload_classes() will store Klasses into this space.
390 // + The lower 3 GB is used for the archive -- when preload_classes()
391 // is done, ArchiveCompactor will copy the class metadata into this
392 // space, first the RW parts, then the RO parts.
393
394 // Starting address of ccs must be aligned to Metaspace::reserve_alignment()...
395 size_t class_space_size = align_down(_shared_rs.size() / 4, Metaspace::reserve_alignment());
396 address class_space_start = (address)align_down(_shared_rs.end() - class_space_size, Metaspace::reserve_alignment());
397 size_t archive_size = class_space_start - (address)_shared_rs.base();
398
399 ReservedSpace tmp_class_space = _shared_rs.last_part(archive_size);
400 _shared_rs = _shared_rs.first_part(archive_size);
401
402 // ... as does the size of ccs.
403 tmp_class_space = tmp_class_space.first_part(class_space_size);
404 CompressedClassSpaceSize = class_space_size;
405
406 // Let Metaspace initialize ccs
407 Metaspace::initialize_class_space(tmp_class_space);
408
409 // and set up CompressedKlassPointers encoding.
410 CompressedKlassPointers::initialize((address)_shared_rs.base(), cds_total);
411
412 log_info(cds)("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
413 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
414
415 log_info(cds)("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
416 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
417
418 assert(_shared_rs.end() == tmp_class_space.base() &&
419 is_aligned(_shared_rs.base(), MetaspaceShared::reserved_space_alignment()) &&
420 is_aligned(tmp_class_space.base(), Metaspace::reserve_alignment()) &&
421 is_aligned(tmp_class_space.size(), Metaspace::reserve_alignment()), "Sanity");
422 }
423
424 #endif
425
426 init_shared_dump_space(&_mc_region);
427 SharedBaseAddress = (size_t)_shared_rs.base();
428 log_info(cds)("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
429 _shared_rs.size(), p2i(_shared_rs.base()));
430
431 // We don't want any valid object to be at the very bottom of the archive.
432 // See ArchivePtrMarker::mark_pointer().
433 MetaspaceShared::misc_code_space_alloc(16);
434
435 size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
436 _symbol_rs = ReservedSpace(symbol_rs_size);
437 if (!_symbol_rs.is_reserved()) {
438 vm_exit_during_initialization("Unable to reserve memory for symbols",
439 err_msg(SIZE_FORMAT " bytes.", symbol_rs_size));
440 }
441 _symbol_region.init(&_symbol_rs, &_symbol_vs);
442 }
443
444 // Called by universe_post_init()
445 void MetaspaceShared::post_initialize(TRAPS) {
446 if (UseSharedSpaces) {
447 int size = FileMapInfo::get_number_of_shared_paths();
448 if (size > 0) {
449 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD);
450 if (!DynamicDumpSharedSpaces) {
451 FileMapInfo* info;
452 if (FileMapInfo::dynamic_info() == NULL) {
453 info = FileMapInfo::current_info();
454 } else {
455 info = FileMapInfo::dynamic_info();
456 }
457 ClassLoaderExt::init_paths_start_index(info->app_class_paths_start_index());
458 ClassLoaderExt::init_app_module_paths_start_index(info->app_module_paths_start_index());
459 }
460 }
461 }
462 }
463
464 static GrowableArrayCHeap<Handle, mtClassShared>* _extra_interned_strings = NULL;
465
466 void MetaspaceShared::read_extra_data(const char* filename, TRAPS) {
467 _extra_interned_strings = new GrowableArrayCHeap<Handle, mtClassShared>(10000);
468
469 HashtableTextDump reader(filename);
470 reader.check_version("VERSION: 1.0");
471
472 while (reader.remain() > 0) {
473 int utf8_length;
474 int prefix_type = reader.scan_prefix(&utf8_length);
475 ResourceMark rm(THREAD);
476 if (utf8_length == 0x7fffffff) {
477 // buf_len will overflown 32-bit value.
478 vm_exit_during_initialization(err_msg("string length too large: %d", utf8_length));
479 }
480 int buf_len = utf8_length+1;
481 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
482 reader.get_utf8(utf8_buffer, utf8_length);
483 utf8_buffer[utf8_length] = '\0';
484
485 if (prefix_type == HashtableTextDump::SymbolPrefix) {
486 SymbolTable::new_permanent_symbol(utf8_buffer);
487 } else{
488 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
489 oop s = StringTable::intern(utf8_buffer, THREAD);
490
491 if (HAS_PENDING_EXCEPTION) {
492 log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
493 reader.last_line_no(), utf8_length);
494 CLEAR_PENDING_EXCEPTION;
495 } else {
496 #if INCLUDE_G1GC
497 if (UseG1GC) {
498 typeArrayOop body = java_lang_String::value(s);
499 const HeapRegion* hr = G1CollectedHeap::heap()->heap_region_containing(body);
500 if (hr->is_humongous()) {
501 // Don't keep it alive, so it will be GC'ed before we dump the strings, in order
502 // to maximize free heap space and minimize fragmentation.
503 log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
504 reader.last_line_no(), utf8_length);
505 continue;
506 }
507 }
508 #endif
509 // Interned strings are GC'ed if there are no references to it, so let's
510 // add a reference to keep this string alive.
511 assert(s != NULL, "must succeed");
512 Handle h(THREAD, s);
513 _extra_interned_strings->append(h);
514 }
515 }
516 }
517 }
518
519 void MetaspaceShared::commit_to(ReservedSpace* rs, VirtualSpace* vs, char* newtop) {
520 Arguments::assert_is_dumping_archive();
521 char* base = rs->base();
522 size_t need_committed_size = newtop - base;
523 size_t has_committed_size = vs->committed_size();
524 if (need_committed_size < has_committed_size) {
525 return;
526 }
527
528 size_t min_bytes = need_committed_size - has_committed_size;
529 size_t preferred_bytes = 1 * M;
530 size_t uncommitted = vs->reserved_size() - has_committed_size;
531
532 size_t commit =MAX2(min_bytes, preferred_bytes);
533 commit = MIN2(commit, uncommitted);
534 assert(commit <= uncommitted, "sanity");
535
536 bool result = vs->expand_by(commit, false);
537 if (rs == &_shared_rs) {
538 ArchivePtrMarker::expand_ptr_end((address*)vs->high());
539 }
540
541 if (!result) {
542 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
543 need_committed_size));
544 }
545
546 assert(rs == &_shared_rs || rs == &_symbol_rs, "must be");
547 const char* which = (rs == &_shared_rs) ? "shared" : "symbol";
548 log_debug(cds)("Expanding %s spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
549 which, commit, vs->actual_committed_size(), vs->high());
550 }
551
552 void MetaspaceShared::initialize_ptr_marker(CHeapBitMap* ptrmap) {
553 ArchivePtrMarker::initialize(ptrmap, (address*)_shared_vs.low(), (address*)_shared_vs.high());
554 }
555
556 // Read/write a data stream for restoring/preserving metadata pointers and
557 // miscellaneous data from/to the shared archive file.
558
559 void MetaspaceShared::serialize(SerializeClosure* soc) {
560 int tag = 0;
561 soc->do_tag(--tag);
562
563 // Verify the sizes of various metadata in the system.
564 soc->do_tag(sizeof(Method));
565 soc->do_tag(sizeof(ConstMethod));
566 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
567 soc->do_tag(sizeof(ConstantPool));
568 soc->do_tag(sizeof(ConstantPoolCache));
569 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
570 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
571 soc->do_tag(sizeof(Symbol));
572
573 // Dump/restore miscellaneous metadata.
574 JavaClasses::serialize_offsets(soc);
575 Universe::serialize(soc);
576 soc->do_tag(--tag);
577
578 // Dump/restore references to commonly used names and signatures.
579 vmSymbols::serialize(soc);
580 soc->do_tag(--tag);
581
582 // Dump/restore the symbol/string/subgraph_info tables
583 SymbolTable::serialize_shared_table_header(soc);
584 StringTable::serialize_shared_table_header(soc);
585 HeapShared::serialize_subgraph_info_table_header(soc);
586 SystemDictionaryShared::serialize_dictionary_headers(soc);
587
588 InstanceMirrorKlass::serialize_offsets(soc);
589
590 // Dump/restore well known classes (pointers)
591 SystemDictionaryShared::serialize_well_known_klasses(soc);
592 soc->do_tag(--tag);
593
594 serialize_cloned_cpp_vtptrs(soc);
595 soc->do_tag(--tag);
596
597 CDS_JAVA_HEAP_ONLY(ClassLoaderData::serialize(soc));
598
599 soc->do_tag(666);
600 }
601
602 address MetaspaceShared::i2i_entry_code_buffers(size_t total_size) {
603 if (DumpSharedSpaces) {
604 if (_i2i_entry_code_buffers == NULL) {
605 _i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
606 _i2i_entry_code_buffers_size = total_size;
607 }
608 } else if (UseSharedSpaces) {
609 assert(_i2i_entry_code_buffers != NULL, "must already been initialized");
610 } else {
611 return NULL;
612 }
613
614 assert(_i2i_entry_code_buffers_size == total_size, "must not change");
615 return _i2i_entry_code_buffers;
616 }
617
618 uintx MetaspaceShared::object_delta_uintx(void* obj) {
619 Arguments::assert_is_dumping_archive();
620 if (DumpSharedSpaces) {
621 assert(shared_rs()->contains(obj), "must be");
622 } else {
623 assert(is_in_shared_metaspace(obj) || DynamicArchive::is_in_target_space(obj), "must be");
624 }
625 address base_address = address(SharedBaseAddress);
626 uintx deltax = address(obj) - base_address;
627 return deltax;
628 }
629
630 // Global object for holding classes that have been loaded. Since this
631 // is run at a safepoint just before exit, this is the entire set of classes.
632 static GrowableArray<Klass*>* _global_klass_objects;
633
634 static int global_klass_compare(Klass** a, Klass **b) {
635 return a[0]->name()->fast_compare(b[0]->name());
636 }
637
638 GrowableArray<Klass*>* MetaspaceShared::collected_klasses() {
639 return _global_klass_objects;
640 }
641
642 static void collect_array_classes(Klass* k) {
643 _global_klass_objects->append_if_missing(k);
644 if (k->is_array_klass()) {
645 // Add in the array classes too
646 ArrayKlass* ak = ArrayKlass::cast(k);
647 Klass* h = ak->higher_dimension();
648 if (h != NULL) {
649 h->array_klasses_do(collect_array_classes);
650 }
651 }
652 }
653
654 class CollectClassesClosure : public KlassClosure {
655 void do_klass(Klass* k) {
656 if (k->is_instance_klass() &&
657 SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(k))) {
658 // Don't add to the _global_klass_objects
659 } else {
660 _global_klass_objects->append_if_missing(k);
661 }
662 if (k->is_array_klass()) {
663 // Add in the array classes too
664 ArrayKlass* ak = ArrayKlass::cast(k);
665 Klass* h = ak->higher_dimension();
666 if (h != NULL) {
667 h->array_klasses_do(collect_array_classes);
668 }
669 }
670 }
671 };
672
673 // Global object for holding symbols that created during class loading. See SymbolTable::new_symbol
674 static GrowableArray<Symbol*>* _global_symbol_objects = NULL;
675
676 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
677 if (a[0] < b[0]) {
678 return -1;
679 } else if (a[0] == b[0]) {
680 ResourceMark rm;
681 log_warning(cds)("Duplicated symbol %s unexpected", (*a)->as_C_string());
682 return 0;
683 } else {
684 return 1;
685 }
686 }
687
688 void MetaspaceShared::add_symbol(Symbol* sym) {
689 MutexLocker ml(CDSAddSymbol_lock, Mutex::_no_safepoint_check_flag);
690 if (_global_symbol_objects == NULL) {
691 _global_symbol_objects = new (ResourceObj::C_HEAP, mtSymbol) GrowableArray<Symbol*>(2048, mtSymbol);
692 }
693 _global_symbol_objects->append(sym);
694 }
695
696 GrowableArray<Symbol*>* MetaspaceShared::collected_symbols() {
697 return _global_symbol_objects;
698 }
699
700 static void remove_unshareable_in_classes() {
701 for (int i = 0; i < _global_klass_objects->length(); i++) {
702 Klass* k = _global_klass_objects->at(i);
703 if (!k->is_objArray_klass()) {
704 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
705 // on their array classes.
706 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
707 k->remove_unshareable_info();
708 }
709 }
710 }
711
712 static void remove_java_mirror_in_classes() {
713 for (int i = 0; i < _global_klass_objects->length(); i++) {
714 Klass* k = _global_klass_objects->at(i);
715 if (!k->is_objArray_klass()) {
716 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
717 // on their array classes.
718 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
719 k->remove_java_mirror();
720 }
721 }
722 }
723
724 static void clear_basic_type_mirrors() {
725 assert(!HeapShared::is_heap_object_archiving_allowed(), "Sanity");
726 Universe::set_int_mirror(NULL);
727 Universe::set_float_mirror(NULL);
728 Universe::set_double_mirror(NULL);
729 Universe::set_byte_mirror(NULL);
730 Universe::set_bool_mirror(NULL);
731 Universe::set_char_mirror(NULL);
732 Universe::set_long_mirror(NULL);
733 Universe::set_short_mirror(NULL);
734 Universe::set_void_mirror(NULL);
735 }
736
737 static void rewrite_nofast_bytecode(const methodHandle& method) {
738 BytecodeStream bcs(method);
739 while (!bcs.is_last_bytecode()) {
740 Bytecodes::Code opcode = bcs.next();
741 switch (opcode) {
742 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
743 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
744 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
745 case Bytecodes::_iload: {
746 if (!bcs.is_wide()) {
747 *bcs.bcp() = Bytecodes::_nofast_iload;
748 }
749 break;
750 }
751 default: break;
752 }
753 }
754 }
755
756 // Walk all methods in the class list to ensure that they won't be modified at
757 // run time. This includes:
758 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
759 // at run time by RewriteBytecodes/RewriteFrequentPairs
760 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
761 static void rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread) {
762 for (int i = 0; i < _global_klass_objects->length(); i++) {
763 Klass* k = _global_klass_objects->at(i);
764 if (k->is_instance_klass()) {
765 InstanceKlass* ik = InstanceKlass::cast(k);
766 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(thread, ik);
767 }
768 }
769 }
770
771 void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
772 for (int i = 0; i < ik->methods()->length(); i++) {
773 methodHandle m(thread, ik->methods()->at(i));
774 rewrite_nofast_bytecode(m);
775 Fingerprinter fp(m);
776 // The side effect of this call sets method's fingerprint field.
777 fp.fingerprint();
778 }
779 }
780
781 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
782 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
783 //
784 // Addresses of the vtables and the methods may be different across JVM runs,
785 // if libjvm.so is dynamically loaded at a different base address.
786 //
787 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
788 //
789 // + at dump time: we redirect the _vptr to point to our own vtables inside
790 // the CDS image
791 // + at run time: we clone the actual contents of the vtables from libjvm.so
792 // into our own tables.
793
794 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
795 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
796 f(ConstantPool) \
797 f(InstanceKlass) \
798 f(InstanceClassLoaderKlass) \
799 f(InstanceMirrorKlass) \
800 f(InstanceRefKlass) \
801 f(Method) \
802 f(ObjArrayKlass) \
803 f(TypeArrayKlass)
804
805 class CppVtableInfo {
806 intptr_t _vtable_size;
807 intptr_t _cloned_vtable[1];
808 public:
809 static int num_slots(int vtable_size) {
810 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
811 }
812 int vtable_size() { return int(uintx(_vtable_size)); }
813 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
814 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
815 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
816 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
817 static size_t byte_size(int vtable_size) {
818 CppVtableInfo i;
819 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
820 }
821 };
822
823 static inline intptr_t* vtable_of(Metadata* m) {
824 return *((intptr_t**)m);
825 }
826
827 template <class T> class CppVtableCloner : public T {
828 static CppVtableInfo* _info;
829
830 static int get_vtable_length(const char* name);
831
832 public:
833 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
834 static intptr_t* allocate(const char* name);
835
836 // Clone the vtable to ...
837 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
838
839 static void zero_vtable_clone() {
840 assert(DumpSharedSpaces, "dump-time only");
841 _info->zero();
842 }
843
844 static bool is_valid_shared_object(const T* obj) {
845 intptr_t* vptr = *(intptr_t**)obj;
846 return vptr == _info->cloned_vtable();
847 }
848
849 static void init_orig_cpp_vtptr(int kind);
850 };
851
852 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
853
854 template <class T>
855 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
856 assert(is_aligned(_mc_region.top(), sizeof(intptr_t)), "bad alignment");
857 int n = get_vtable_length(name);
858 _info = (CppVtableInfo*)_mc_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
859 _info->set_vtable_size(n);
860
861 intptr_t* p = clone_vtable(name, _info);
862 assert((char*)p == _mc_region.top(), "must be");
863
864 return _info->cloned_vtable();
865 }
866
867 template <class T>
868 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
869 if (!DumpSharedSpaces) {
870 assert(_info == 0, "_info is initialized only at dump time");
871 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
872 }
873 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
874 int n = info->vtable_size();
875 intptr_t* srcvtable = vtable_of(&tmp);
876 intptr_t* dstvtable = info->cloned_vtable();
877
878 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
879 // safe to do memcpy.
880 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
881 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
882 return dstvtable + n;
883 }
884
885 // To determine the size of the vtable for each type, we use the following
886 // trick by declaring 2 subclasses:
887 //
888 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
889 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
890 //
891 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
892 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
893 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
894 // - Their last entry is different.
895 //
896 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
897 // and find the first entry that's different.
898 //
899 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
900 // esoteric compilers.
901
902 template <class T> class CppVtableTesterB: public T {
903 public:
904 virtual int last_virtual_method() {return 1;}
905 };
906
907 template <class T> class CppVtableTesterA : public T {
908 public:
909 virtual void* last_virtual_method() {
910 // Make this different than CppVtableTesterB::last_virtual_method so the C++
911 // compiler/linker won't alias the two functions.
912 return NULL;
913 }
914 };
915
916 template <class T>
917 int CppVtableCloner<T>::get_vtable_length(const char* name) {
918 CppVtableTesterA<T> a;
919 CppVtableTesterB<T> b;
920
921 intptr_t* avtable = vtable_of(&a);
922 intptr_t* bvtable = vtable_of(&b);
923
924 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
925 int vtable_len = 1;
926 for (; ; vtable_len++) {
927 if (avtable[vtable_len] != bvtable[vtable_len]) {
928 break;
929 }
930 }
931 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
932
933 return vtable_len;
934 }
935
936 #define ALLOC_CPP_VTABLE_CLONE(c) \
937 _cloned_cpp_vtptrs[c##_Kind] = CppVtableCloner<c>::allocate(#c); \
938 ArchivePtrMarker::mark_pointer(&_cloned_cpp_vtptrs[c##_Kind]);
939
940 #define CLONE_CPP_VTABLE(c) \
941 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
942
943 #define ZERO_CPP_VTABLE(c) \
944 CppVtableCloner<c>::zero_vtable_clone();
945
946 #define INIT_ORIG_CPP_VTPTRS(c) \
947 CppVtableCloner<c>::init_orig_cpp_vtptr(c##_Kind);
948
949 #define DECLARE_CLONED_VTABLE_KIND(c) c ## _Kind,
950
951 enum ClonedVtableKind {
952 // E.g., ConstantPool_Kind == 0, InstanceKlass_Kind == 1, etc.
953 CPP_VTABLE_PATCH_TYPES_DO(DECLARE_CLONED_VTABLE_KIND)
954 _num_cloned_vtable_kinds
955 };
956
957 // This is a map of all the original vtptrs. E.g., for
958 // ConstantPool *cp = new (...) ConstantPool(...) ; // a dynamically allocated constant pool
959 // the following holds true:
960 // _orig_cpp_vtptrs[ConstantPool_Kind] == ((intptr_t**)cp)[0]
961 static intptr_t* _orig_cpp_vtptrs[_num_cloned_vtable_kinds];
962 static bool _orig_cpp_vtptrs_inited = false;
963
964 template <class T>
965 void CppVtableCloner<T>::init_orig_cpp_vtptr(int kind) {
966 assert(kind < _num_cloned_vtable_kinds, "sanity");
967 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
968 intptr_t* srcvtable = vtable_of(&tmp);
969 _orig_cpp_vtptrs[kind] = srcvtable;
970 }
971
972 // This is the index of all the cloned vtables. E.g., for
973 // ConstantPool* cp = ....; // an archived constant pool
974 // InstanceKlass* ik = ....;// an archived class
975 // the following holds true:
976 // _cloned_cpp_vtptrs[ConstantPool_Kind] == ((intptr_t**)cp)[0]
977 // _cloned_cpp_vtptrs[InstanceKlass_Kind] == ((intptr_t**)ik)[0]
978 static intptr_t** _cloned_cpp_vtptrs = NULL;
979
980 void MetaspaceShared::allocate_cloned_cpp_vtptrs() {
981 assert(DumpSharedSpaces, "must");
982 size_t vtptrs_bytes = _num_cloned_vtable_kinds * sizeof(intptr_t*);
983 _cloned_cpp_vtptrs = (intptr_t**)_mc_region.allocate(vtptrs_bytes, sizeof(intptr_t*));
984 }
985
986 void MetaspaceShared::serialize_cloned_cpp_vtptrs(SerializeClosure* soc) {
987 soc->do_ptr((void**)&_cloned_cpp_vtptrs);
988 }
989
990 intptr_t* MetaspaceShared::get_archived_cpp_vtable(MetaspaceObj::Type msotype, address obj) {
991 if (!_orig_cpp_vtptrs_inited) {
992 CPP_VTABLE_PATCH_TYPES_DO(INIT_ORIG_CPP_VTPTRS);
993 _orig_cpp_vtptrs_inited = true;
994 }
995
996 Arguments::assert_is_dumping_archive();
997 int kind = -1;
998 switch (msotype) {
999 case MetaspaceObj::SymbolType:
1000 case MetaspaceObj::TypeArrayU1Type:
1001 case MetaspaceObj::TypeArrayU2Type:
1002 case MetaspaceObj::TypeArrayU4Type:
1003 case MetaspaceObj::TypeArrayU8Type:
1004 case MetaspaceObj::TypeArrayOtherType:
1005 case MetaspaceObj::ConstMethodType:
1006 case MetaspaceObj::ConstantPoolCacheType:
1007 case MetaspaceObj::AnnotationsType:
1008 case MetaspaceObj::MethodCountersType:
1009 case MetaspaceObj::RecordComponentType:
1010 // These have no vtables.
1011 break;
1012 case MetaspaceObj::MethodDataType:
1013 // We don't archive MethodData <-- should have been removed in removed_unsharable_info
1014 ShouldNotReachHere();
1015 break;
1016 default:
1017 for (kind = 0; kind < _num_cloned_vtable_kinds; kind ++) {
1018 if (vtable_of((Metadata*)obj) == _orig_cpp_vtptrs[kind]) {
1019 break;
1020 }
1021 }
1022 if (kind >= _num_cloned_vtable_kinds) {
1023 fatal("Cannot find C++ vtable for " INTPTR_FORMAT " -- you probably added"
1024 " a new subtype of Klass or MetaData without updating CPP_VTABLE_PATCH_TYPES_DO",
1025 p2i(obj));
1026 }
1027 }
1028
1029 if (kind >= 0) {
1030 assert(kind < _num_cloned_vtable_kinds, "must be");
1031 return _cloned_cpp_vtptrs[kind];
1032 } else {
1033 return NULL;
1034 }
1035 }
1036
1037 // This can be called at both dump time and run time:
1038 // - clone the contents of the c++ vtables into the space
1039 // allocated by allocate_cpp_vtable_clones()
1040 void MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
1041 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
1042 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
1043 }
1044
1045 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
1046 assert(DumpSharedSpaces, "dump-time only");
1047 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
1048 }
1049
1050 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
1051 char* MetaspaceShared::allocate_cpp_vtable_clones() {
1052 char* cloned_vtables = _mc_region.top(); // This is the beginning of all the cloned vtables
1053
1054 assert(DumpSharedSpaces, "dump-time only");
1055 // Layout (each slot is a intptr_t):
1056 // [number of slots in the first vtable = n1]
1057 // [ <n1> slots for the first vtable]
1058 // [number of slots in the first second = n2]
1059 // [ <n2> slots for the second vtable]
1060 // ...
1061 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
1062 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
1063
1064 return cloned_vtables;
1065 }
1066
1067 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
1068 assert(is_in_shared_metaspace(m), "must be");
1069 return CppVtableCloner<Method>::is_valid_shared_object(m);
1070 }
1071
1072 void WriteClosure::do_oop(oop* o) {
1073 if (*o == NULL) {
1074 _dump_region->append_intptr_t(0);
1075 } else {
1076 assert(HeapShared::is_heap_object_archiving_allowed(),
1077 "Archiving heap object is not allowed");
1078 _dump_region->append_intptr_t(
1079 (intptr_t)CompressedOops::encode_not_null(*o));
1080 }
1081 }
1082
1083 void WriteClosure::do_region(u_char* start, size_t size) {
1084 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1085 assert(size % sizeof(intptr_t) == 0, "bad size");
1086 do_tag((int)size);
1087 while (size > 0) {
1088 _dump_region->append_intptr_t(*(intptr_t*)start, true);
1089 start += sizeof(intptr_t);
1090 size -= sizeof(intptr_t);
1091 }
1092 }
1093
1094 // This is for dumping detailed statistics for the allocations
1095 // in the shared spaces.
1096 class DumpAllocStats : public ResourceObj {
1097 public:
1098
1099 // Here's poor man's enum inheritance
1100 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
1101 METASPACE_OBJ_TYPES_DO(f) \
1102 f(SymbolHashentry) \
1103 f(SymbolBucket) \
1104 f(StringHashentry) \
1105 f(StringBucket) \
1106 f(ModulesNatives) \
1107 f(Other)
1108
1109 enum Type {
1110 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
1111 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
1112 _number_of_types
1113 };
1114
1115 static const char * type_name(Type type) {
1116 switch(type) {
1117 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
1118 default:
1119 ShouldNotReachHere();
1120 return NULL;
1121 }
1122 }
1123
1124 public:
1125 enum { RO = 0, RW = 1 };
1126
1127 int _counts[2][_number_of_types];
1128 int _bytes [2][_number_of_types];
1129
1130 DumpAllocStats() {
1131 memset(_counts, 0, sizeof(_counts));
1132 memset(_bytes, 0, sizeof(_bytes));
1133 };
1134
1135 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
1136 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
1137 int which = (read_only) ? RO : RW;
1138 _counts[which][type] ++;
1139 _bytes [which][type] += byte_size;
1140 }
1141
1142 void record_modules(int byte_size, bool read_only) {
1143 int which = (read_only) ? RO : RW;
1144 _bytes [which][ModulesNativesType] += byte_size;
1145 }
1146
1147 void record_other_type(int byte_size, bool read_only) {
1148 int which = (read_only) ? RO : RW;
1149 _bytes [which][OtherType] += byte_size;
1150 }
1151 void print_stats(int ro_all, int rw_all, int mc_all);
1152 };
1153
1154 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all) {
1155 // Calculate size of data that was not allocated by Metaspace::allocate()
1156 MetaspaceSharedStats *stats = MetaspaceShared::stats();
1157
1158 // symbols
1159 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
1160 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
1161
1162 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
1163 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
1164
1165 // strings
1166 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
1167 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
1168
1169 _counts[RO][StringBucketType] = stats->string.bucket_count;
1170 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
1171
1172 // TODO: count things like dictionary, vtable, etc
1173 _bytes[RW][OtherType] += mc_all;
1174 rw_all += mc_all; // mc is mapped Read/Write
1175
1176 // prevent divide-by-zero
1177 if (ro_all < 1) {
1178 ro_all = 1;
1179 }
1180 if (rw_all < 1) {
1181 rw_all = 1;
1182 }
1183
1184 int all_ro_count = 0;
1185 int all_ro_bytes = 0;
1186 int all_rw_count = 0;
1187 int all_rw_bytes = 0;
1188
1189 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
1190 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
1191 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
1192 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
1193
1194 LogMessage(cds) msg;
1195
1196 msg.debug("Detailed metadata info (excluding st regions; rw stats include mc regions):");
1197 msg.debug("%s", hdr);
1198 msg.debug("%s", sep);
1199 for (int type = 0; type < int(_number_of_types); type ++) {
1200 const char *name = type_name((Type)type);
1201 int ro_count = _counts[RO][type];
1202 int ro_bytes = _bytes [RO][type];
1203 int rw_count = _counts[RW][type];
1204 int rw_bytes = _bytes [RW][type];
1205 int count = ro_count + rw_count;
1206 int bytes = ro_bytes + rw_bytes;
1207
1208 double ro_perc = percent_of(ro_bytes, ro_all);
1209 double rw_perc = percent_of(rw_bytes, rw_all);
1210 double perc = percent_of(bytes, ro_all + rw_all);
1211
1212 msg.debug(fmt_stats, name,
1213 ro_count, ro_bytes, ro_perc,
1214 rw_count, rw_bytes, rw_perc,
1215 count, bytes, perc);
1216
1217 all_ro_count += ro_count;
1218 all_ro_bytes += ro_bytes;
1219 all_rw_count += rw_count;
1220 all_rw_bytes += rw_bytes;
1221 }
1222
1223 int all_count = all_ro_count + all_rw_count;
1224 int all_bytes = all_ro_bytes + all_rw_bytes;
1225
1226 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1227 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1228 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1229
1230 msg.debug("%s", sep);
1231 msg.debug(fmt_stats, "Total",
1232 all_ro_count, all_ro_bytes, all_ro_perc,
1233 all_rw_count, all_rw_bytes, all_rw_perc,
1234 all_count, all_bytes, all_perc);
1235
1236 assert(all_ro_bytes == ro_all, "everything should have been counted");
1237 assert(all_rw_bytes == rw_all, "everything should have been counted");
1238
1239 #undef fmt_stats
1240 }
1241
1242 // Populate the shared space.
1243
1244 class VM_PopulateDumpSharedSpace: public VM_Operation {
1245 private:
1246 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1247 GrowableArray<MemRegion> *_open_archive_heap_regions;
1248
1249 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
1250 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
1251
1252 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1253 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
1254 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1255 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
1256 void dump_symbols();
1257 char* dump_read_only_tables();
1258 void print_class_stats();
1259 void print_region_stats(FileMapInfo* map_info);
1260 void print_bitmap_region_stats(size_t size, size_t total_size);
1261 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1262 const char *name, size_t total_size);
1263 void relocate_to_requested_base_address(CHeapBitMap* ptrmap);
1264
1265 public:
1266
1267 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1268 void doit(); // outline because gdb sucks
1269 bool allow_nested_vm_operations() const { return true; }
1270 }; // class VM_PopulateDumpSharedSpace
1271
1272 // ArchiveCompactor --
1273 //
1274 // This class is the central piece of shared archive compaction -- all metaspace data are
1275 // initially allocated outside of the shared regions. ArchiveCompactor copies the
1276 // metaspace data into their final location in the shared regions.
1277
1278 class ArchiveCompactor : AllStatic {
1279 static const int INITIAL_TABLE_SIZE = 8087;
1280 static const int MAX_TABLE_SIZE = 1000000;
1281
1282 static DumpAllocStats* _alloc_stats;
1283
1284 typedef KVHashtable<address, address, mtInternal> RelocationTable;
1285 static RelocationTable* _new_loc_table;
1286
1287 public:
1288 static void initialize() {
1289 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1290 _new_loc_table = new RelocationTable(INITIAL_TABLE_SIZE);
1291 }
1292 static DumpAllocStats* alloc_stats() {
1293 return _alloc_stats;
1294 }
1295
1296 // Use this when you allocate space with MetaspaceShare::read_only_space_alloc()
1297 // outside of ArchiveCompactor::allocate(). These are usually for misc tables
1298 // that are allocated in the RO space.
1299 class OtherROAllocMark {
1300 char* _oldtop;
1301 public:
1302 OtherROAllocMark() {
1303 _oldtop = _ro_region.top();
1304 }
1305 ~OtherROAllocMark() {
1306 char* newtop = _ro_region.top();
1307 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
1308 }
1309 };
1310
1311 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1312 address obj = ref->obj();
1313 int bytes = ref->size() * BytesPerWord;
1314 char* p;
1315 size_t alignment = BytesPerWord;
1316 char* oldtop;
1317 char* newtop;
1318
1319 if (read_only) {
1320 oldtop = _ro_region.top();
1321 p = _ro_region.allocate(bytes, alignment);
1322 newtop = _ro_region.top();
1323 } else {
1324 oldtop = _rw_region.top();
1325 if (ref->msotype() == MetaspaceObj::ClassType) {
1326 // Save a pointer immediate in front of an InstanceKlass, so
1327 // we can do a quick lookup from InstanceKlass* -> RunTimeSharedClassInfo*
1328 // without building another hashtable. See RunTimeSharedClassInfo::get_for()
1329 // in systemDictionaryShared.cpp.
1330 Klass* klass = (Klass*)obj;
1331 if (klass->is_instance_klass()) {
1332 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
1333 _rw_region.allocate(sizeof(address), BytesPerWord);
1334 }
1335 }
1336 p = _rw_region.allocate(bytes, alignment);
1337 newtop = _rw_region.top();
1338 }
1339 memcpy(p, obj, bytes);
1340
1341 intptr_t* archived_vtable = MetaspaceShared::get_archived_cpp_vtable(ref->msotype(), (address)p);
1342 if (archived_vtable != NULL) {
1343 *(address*)p = (address)archived_vtable;
1344 ArchivePtrMarker::mark_pointer((address*)p);
1345 }
1346
1347 assert(_new_loc_table->lookup(obj) == NULL, "each object can be relocated at most once");
1348 _new_loc_table->add(obj, (address)p);
1349 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1350 if (_new_loc_table->maybe_grow(MAX_TABLE_SIZE)) {
1351 log_info(cds, hashtables)("Expanded _new_loc_table to %d", _new_loc_table->table_size());
1352 }
1353 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1354 }
1355
1356 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1357 address* pp = _new_loc_table->lookup(ref->obj());
1358 assert(pp != NULL, "must be");
1359 return *pp;
1360 }
1361
1362 private:
1363 // Makes a shallow copy of visited MetaspaceObj's
1364 class ShallowCopier: public UniqueMetaspaceClosure {
1365 bool _read_only;
1366 public:
1367 ShallowCopier(bool read_only) : _read_only(read_only) {}
1368
1369 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1370 if (read_only == _read_only) {
1371 allocate(ref, read_only);
1372 }
1373 return true; // recurse into ref.obj()
1374 }
1375 };
1376
1377 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1378 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1379 public:
1380 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1381 address new_loc = get_new_loc(ref);
1382 RefRelocator refer;
1383 ref->metaspace_pointers_do_at(&refer, new_loc);
1384 return true; // recurse into ref.obj()
1385 }
1386 virtual void push_special(SpecialRef type, Ref* ref, intptr_t* p) {
1387 assert(type == _method_entry_ref, "only special type allowed for now");
1388 address obj = ref->obj();
1389 address new_obj = get_new_loc(ref);
1390 size_t offset = pointer_delta(p, obj, sizeof(u1));
1391 intptr_t* new_p = (intptr_t*)(new_obj + offset);
1392 assert(*p == *new_p, "must be a copy");
1393 ArchivePtrMarker::mark_pointer((address*)new_p);
1394 }
1395 };
1396
1397 // Relocate a reference to point to its shallow copy
1398 class RefRelocator: public MetaspaceClosure {
1399 public:
1400 virtual bool do_ref(Ref* ref, bool read_only) {
1401 if (ref->not_null()) {
1402 ref->update(get_new_loc(ref));
1403 ArchivePtrMarker::mark_pointer(ref->addr());
1404 }
1405 return false; // Do not recurse.
1406 }
1407 };
1408
1409 #ifdef ASSERT
1410 class IsRefInArchiveChecker: public MetaspaceClosure {
1411 public:
1412 virtual bool do_ref(Ref* ref, bool read_only) {
1413 if (ref->not_null()) {
1414 char* obj = (char*)ref->obj();
1415 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1416 "must be relocated to point to CDS archive");
1417 }
1418 return false; // Do not recurse.
1419 }
1420 };
1421 #endif
1422
1423 public:
1424 static void copy_and_compact() {
1425 ResourceMark rm;
1426
1427 log_info(cds)("Scanning all metaspace objects ... ");
1428 {
1429 // allocate and shallow-copy RW objects, immediately following the MC region
1430 log_info(cds)("Allocating RW objects ... ");
1431 _mc_region.pack(&_rw_region);
1432
1433 ResourceMark rm;
1434 ShallowCopier rw_copier(false);
1435 iterate_roots(&rw_copier);
1436
1437 #if INCLUDE_CDS_JAVA_HEAP
1438 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
1439 char* start = _rw_region.top();
1440 ClassLoaderData::allocate_archived_tables();
1441 ArchiveCompactor::alloc_stats()->record_modules(_rw_region.top() - start, /*read_only*/false);
1442 #endif
1443 }
1444 {
1445 // allocate and shallow-copy of RO object, immediately following the RW region
1446 log_info(cds)("Allocating RO objects ... ");
1447 _rw_region.pack(&_ro_region);
1448
1449 ResourceMark rm;
1450 ShallowCopier ro_copier(true);
1451 iterate_roots(&ro_copier);
1452 #if INCLUDE_CDS_JAVA_HEAP
1453 char* start = _ro_region.top();
1454 ClassLoaderData::init_archived_tables();
1455 ArchiveCompactor::alloc_stats()->record_modules(_ro_region.top() - start, /*read_only*/true);
1456 #endif
1457 }
1458 {
1459 log_info(cds)("Relocating embedded pointers ... ");
1460 ResourceMark rm;
1461 ShallowCopyEmbeddedRefRelocator emb_reloc;
1462 iterate_roots(&emb_reloc);
1463 }
1464 {
1465 log_info(cds)("Relocating external roots ... ");
1466 ResourceMark rm;
1467 RefRelocator ext_reloc;
1468 iterate_roots(&ext_reloc);
1469 }
1470 {
1471 log_info(cds)("Fixing symbol identity hash ... ");
1472 os::init_random(0x12345678);
1473 GrowableArray<Symbol*>* all_symbols = MetaspaceShared::collected_symbols();
1474 all_symbols->sort(compare_symbols_by_address);
1475 for (int i = 0; i < all_symbols->length(); i++) {
1476 assert(all_symbols->at(i)->is_permanent(), "archived symbols must be permanent");
1477 all_symbols->at(i)->update_identity_hash();
1478 }
1479 }
1480 #ifdef ASSERT
1481 {
1482 log_info(cds)("Verifying external roots ... ");
1483 ResourceMark rm;
1484 IsRefInArchiveChecker checker;
1485 iterate_roots(&checker);
1486 }
1487 #endif
1488 }
1489
1490 // We must relocate the System::_well_known_klasses only after we have copied the
1491 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1492 // old objects which assert that their klass is the original klass.
1493 static void relocate_well_known_klasses() {
1494 {
1495 log_info(cds)("Relocating SystemDictionary::_well_known_klasses[] ... ");
1496 ResourceMark rm;
1497 RefRelocator ext_reloc;
1498 SystemDictionary::well_known_klasses_do(&ext_reloc);
1499 }
1500 // NOTE: after this point, we shouldn't have any globals that can reach the old
1501 // objects.
1502
1503 // We cannot use any of the objects in the heap anymore (except for the
1504 // shared strings) because their headers no longer point to valid Klasses.
1505 }
1506
1507 static void iterate_roots(MetaspaceClosure* it) {
1508 // To ensure deterministic contents in the archive, we just need to ensure that
1509 // we iterate the MetsapceObjs in a deterministic order. It doesn't matter where
1510 // the MetsapceObjs are located originally, as they are copied sequentially into
1511 // the archive during the iteration.
1512 //
1513 // The only issue here is that the symbol table and the system directories may be
1514 // randomly ordered, so we copy the symbols and klasses into two arrays and sort
1515 // them deterministically.
1516 //
1517 // During -Xshare:dump, the order of Symbol creation is strictly determined by
1518 // the SharedClassListFile (class loading is done in a single thread and the JIT
1519 // is disabled). Also, Symbols are allocated in monotonically increasing addresses
1520 // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
1521 // ascending address order, we ensure that all Symbols are copied into deterministic
1522 // locations in the archive.
1523 GrowableArray<Symbol*>* symbols = _global_symbol_objects;
1524 for (int i = 0; i < symbols->length(); i++) {
1525 it->push(symbols->adr_at(i));
1526 }
1527 if (_global_klass_objects != NULL) {
1528 // Need to fix up the pointers
1529 for (int i = 0; i < _global_klass_objects->length(); i++) {
1530 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1531 it->push(_global_klass_objects->adr_at(i));
1532 }
1533 }
1534 FileMapInfo::metaspace_pointers_do(it, false);
1535 SystemDictionaryShared::dumptime_classes_do(it);
1536 Universe::metaspace_pointers_do(it);
1537 SymbolTable::metaspace_pointers_do(it);
1538 vmSymbols::metaspace_pointers_do(it);
1539
1540 it->finish();
1541 }
1542
1543 static Klass* get_relocated_klass(Klass* orig_klass) {
1544 assert(DumpSharedSpaces, "dump time only");
1545 address* pp = _new_loc_table->lookup((address)orig_klass);
1546 assert(pp != NULL, "must be");
1547 Klass* klass = (Klass*)(*pp);
1548 assert(klass->is_klass(), "must be");
1549 return klass;
1550 }
1551
1552 static Symbol* get_relocated_symbol(Symbol* orig_symbol) {
1553 assert(DumpSharedSpaces, "dump time only");
1554 address* pp = _new_loc_table->lookup((address)orig_symbol);
1555 assert(pp != NULL, "must be");
1556 return (Symbol*)(*pp);
1557 }
1558 };
1559
1560 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1561 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1562
1563 void VM_PopulateDumpSharedSpace::dump_symbols() {
1564 log_info(cds)("Dumping symbol table ...");
1565
1566 NOT_PRODUCT(SymbolTable::verify());
1567 SymbolTable::write_to_archive();
1568 }
1569
1570 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1571 ArchiveCompactor::OtherROAllocMark mark;
1572
1573 log_info(cds)("Removing java_mirror ... ");
1574 if (!HeapShared::is_heap_object_archiving_allowed()) {
1575 clear_basic_type_mirrors();
1576 }
1577 remove_java_mirror_in_classes();
1578 log_info(cds)("done. ");
1579
1580 SystemDictionaryShared::write_to_archive();
1581
1582 // Write the other data to the output array.
1583 char* start = _ro_region.top();
1584 WriteClosure wc(&_ro_region);
1585 MetaspaceShared::serialize(&wc);
1586
1587 // Write the bitmaps for patching the archive heap regions
1588 _closed_archive_heap_oopmaps = NULL;
1589 _open_archive_heap_oopmaps = NULL;
1590 dump_archive_heap_oopmaps();
1591
1592 return start;
1593 }
1594
1595 void VM_PopulateDumpSharedSpace::print_class_stats() {
1596 log_info(cds)("Number of classes %d", _global_klass_objects->length());
1597 {
1598 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1599 for (int i = 0; i < _global_klass_objects->length(); i++) {
1600 Klass* k = _global_klass_objects->at(i);
1601 if (k->is_instance_klass()) {
1602 num_inst ++;
1603 } else if (k->is_objArray_klass()) {
1604 num_obj_array ++;
1605 } else {
1606 assert(k->is_typeArray_klass(), "sanity");
1607 num_type_array ++;
1608 }
1609 }
1610 log_info(cds)(" instance classes = %5d", num_inst);
1611 log_info(cds)(" obj array classes = %5d", num_obj_array);
1612 log_info(cds)(" type array classes = %5d", num_type_array);
1613 }
1614 }
1615
1616 void VM_PopulateDumpSharedSpace::relocate_to_requested_base_address(CHeapBitMap* ptrmap) {
1617 intx addr_delta = MetaspaceShared::final_delta();
1618 if (addr_delta == 0) {
1619 ArchivePtrMarker::compact((address)SharedBaseAddress, (address)_ro_region.top());
1620 } else {
1621 // We are not able to reserve space at MetaspaceShared::requested_base_address() (due to ASLR).
1622 // This means that the current content of the archive is based on a random
1623 // address. Let's relocate all the pointers, so that it can be mapped to
1624 // MetaspaceShared::requested_base_address() without runtime relocation.
1625 //
1626 // Note: both the base and dynamic archive are written with
1627 // FileMapHeader::_requested_base_address == MetaspaceShared::requested_base_address()
1628
1629 // Patch all pointers that are marked by ptrmap within this region,
1630 // where we have just dumped all the metaspace data.
1631 address patch_base = (address)SharedBaseAddress;
1632 address patch_end = (address)_ro_region.top();
1633 size_t size = patch_end - patch_base;
1634
1635 // the current value of the pointers to be patched must be within this
1636 // range (i.e., must point to valid metaspace objects)
1637 address valid_old_base = patch_base;
1638 address valid_old_end = patch_end;
1639
1640 // after patching, the pointers must point inside this range
1641 // (the requested location of the archive, as mapped at runtime).
1642 address valid_new_base = (address)MetaspaceShared::requested_base_address();
1643 address valid_new_end = valid_new_base + size;
1644
1645 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT " ] to "
1646 "[" INTPTR_FORMAT " - " INTPTR_FORMAT " ]", p2i(patch_base), p2i(patch_end),
1647 p2i(valid_new_base), p2i(valid_new_end));
1648
1649 SharedDataRelocator<true> patcher((address*)patch_base, (address*)patch_end, valid_old_base, valid_old_end,
1650 valid_new_base, valid_new_end, addr_delta, ptrmap);
1651 ptrmap->iterate(&patcher);
1652 ArchivePtrMarker::compact(patcher.max_non_null_offset());
1653 }
1654 }
1655
1656 void VM_PopulateDumpSharedSpace::doit() {
1657 HeapShared::run_full_gc_in_vm_thread();
1658 CHeapBitMap ptrmap;
1659 MetaspaceShared::initialize_ptr_marker(&ptrmap);
1660
1661 // We should no longer allocate anything from the metaspace, so that:
1662 //
1663 // (1) Metaspace::allocate might trigger GC if we have run out of
1664 // committed metaspace, but we can't GC because we're running
1665 // in the VM thread.
1666 // (2) ArchiveCompactor needs to work with a stable set of MetaspaceObjs.
1667 Metaspace::freeze();
1668 DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
1669
1670 Thread* THREAD = VMThread::vm_thread();
1671
1672 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1673
1674 NOT_PRODUCT(SystemDictionary::verify();)
1675 // The following guarantee is meant to ensure that no loader constraints
1676 // exist yet, since the constraints table is not shared. This becomes
1677 // more important now that we don't re-initialize vtables/itables for
1678 // shared classes at runtime, where constraints were previously created.
1679 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1680 "loader constraints are not saved");
1681 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1682 "placeholders are not saved");
1683
1684 // At this point, many classes have been loaded.
1685 // Gather systemDictionary classes in a global array and do everything to
1686 // that so we don't have to walk the SystemDictionary again.
1687 SystemDictionaryShared::check_excluded_classes();
1688 _global_klass_objects = new GrowableArray<Klass*>(1000);
1689 CollectClassesClosure collect_classes;
1690 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1691 _global_klass_objects->sort(global_klass_compare);
1692
1693 print_class_stats();
1694
1695 // Ensure the ConstMethods won't be modified at run-time
1696 log_info(cds)("Updating ConstMethods ... ");
1697 rewrite_nofast_bytecodes_and_calculate_fingerprints(THREAD);
1698 log_info(cds)("done. ");
1699
1700 // Remove all references outside the metadata
1701 log_info(cds)("Removing unshareable information ... ");
1702 remove_unshareable_in_classes();
1703 log_info(cds)("done. ");
1704
1705 MetaspaceShared::allocate_cloned_cpp_vtptrs();
1706 char* cloned_vtables = _mc_region.top();
1707 MetaspaceShared::allocate_cpp_vtable_clones();
1708
1709 ArchiveCompactor::initialize();
1710 ArchiveCompactor::copy_and_compact();
1711
1712 dump_symbols();
1713
1714 // Dump supported java heap objects
1715 _closed_archive_heap_regions = NULL;
1716 _open_archive_heap_regions = NULL;
1717 dump_java_heap_objects();
1718
1719 ArchiveCompactor::relocate_well_known_klasses();
1720
1721 char* serialized_data = dump_read_only_tables();
1722 _ro_region.pack();
1723
1724 // The vtable clones contain addresses of the current process.
1725 // We don't want to write these addresses into the archive. Same for i2i buffer.
1726 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1727 memset(MetaspaceShared::i2i_entry_code_buffers(), 0,
1728 MetaspaceShared::i2i_entry_code_buffers_size());
1729
1730 // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
1731 // without runtime relocation.
1732 relocate_to_requested_base_address(&ptrmap);
1733
1734 // Create and write the archive file that maps the shared spaces.
1735
1736 FileMapInfo* mapinfo = new FileMapInfo(true);
1737 mapinfo->populate_header(os::vm_allocation_granularity());
1738 mapinfo->set_serialized_data(serialized_data);
1739 mapinfo->set_cloned_vtables(cloned_vtables);
1740 mapinfo->set_i2i_entry_code_buffers(MetaspaceShared::i2i_entry_code_buffers(),
1741 MetaspaceShared::i2i_entry_code_buffers_size());
1742 mapinfo->open_for_write();
1743 MetaspaceShared::write_core_archive_regions(mapinfo, _closed_archive_heap_oopmaps, _open_archive_heap_oopmaps);
1744 _total_closed_archive_region_size = mapinfo->write_archive_heap_regions(
1745 _closed_archive_heap_regions,
1746 _closed_archive_heap_oopmaps,
1747 MetaspaceShared::first_closed_archive_heap_region,
1748 MetaspaceShared::max_closed_archive_heap_region);
1749 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1750 _open_archive_heap_regions,
1751 _open_archive_heap_oopmaps,
1752 MetaspaceShared::first_open_archive_heap_region,
1753 MetaspaceShared::max_open_archive_heap_region);
1754
1755 mapinfo->set_final_requested_base((char*)MetaspaceShared::requested_base_address());
1756 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1757 mapinfo->write_header();
1758 print_region_stats(mapinfo);
1759 mapinfo->close();
1760
1761 if (log_is_enabled(Info, cds)) {
1762 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1763 int(_mc_region.used()));
1764 }
1765
1766 if (PrintSystemDictionaryAtExit) {
1767 SystemDictionary::print();
1768 }
1769
1770 if (AllowArchivingWithJavaAgent) {
1771 warning("This archive was created with AllowArchivingWithJavaAgent. It should be used "
1772 "for testing purposes only and should not be used in a production environment");
1773 }
1774
1775 // There may be other pending VM operations that operate on the InstanceKlasses,
1776 // which will fail because InstanceKlasses::remove_unshareable_info()
1777 // has been called. Forget these operations and exit the VM directly.
1778 vm_direct_exit(0);
1779 }
1780
1781 void VM_PopulateDumpSharedSpace::print_region_stats(FileMapInfo *map_info) {
1782 // Print statistics of all the regions
1783 const size_t bitmap_used = map_info->space_at(MetaspaceShared::bm)->used();
1784 const size_t bitmap_reserved = map_info->space_at(MetaspaceShared::bm)->used_aligned();
1785 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1786 _mc_region.reserved() +
1787 bitmap_reserved +
1788 _total_closed_archive_region_size +
1789 _total_open_archive_region_size;
1790 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1791 _mc_region.used() +
1792 bitmap_used +
1793 _total_closed_archive_region_size +
1794 _total_open_archive_region_size;
1795 const double total_u_perc = percent_of(total_bytes, total_reserved);
1796
1797 _mc_region.print(total_reserved);
1798 _rw_region.print(total_reserved);
1799 _ro_region.print(total_reserved);
1800 print_bitmap_region_stats(bitmap_used, total_reserved);
1801 print_heap_region_stats(_closed_archive_heap_regions, "ca", total_reserved);
1802 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1803
1804 log_debug(cds)("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1805 total_bytes, total_reserved, total_u_perc);
1806 }
1807
1808 void VM_PopulateDumpSharedSpace::print_bitmap_region_stats(size_t size, size_t total_size) {
1809 log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1810 size, size/double(total_size)*100.0, size);
1811 }
1812
1813 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1814 const char *name, size_t total_size) {
1815 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1816 for (int i = 0; i < arr_len; i++) {
1817 char* start = (char*)heap_mem->at(i).start();
1818 size_t size = heap_mem->at(i).byte_size();
1819 char* top = start + size;
1820 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,
1821 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1822
1823 }
1824 }
1825
1826 void MetaspaceShared::write_core_archive_regions(FileMapInfo* mapinfo,
1827 GrowableArray<ArchiveHeapOopmapInfo>* closed_oopmaps,
1828 GrowableArray<ArchiveHeapOopmapInfo>* open_oopmaps) {
1829 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1830 // MetaspaceShared::n_regions (internal to hotspot).
1831 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1832
1833 // mc contains the trampoline code for method entries, which are patched at run time,
1834 // so it needs to be read/write.
1835 write_region(mapinfo, mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1836 write_region(mapinfo, rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1837 write_region(mapinfo, ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1838 mapinfo->write_bitmap_region(ArchivePtrMarker::ptrmap(), closed_oopmaps, open_oopmaps);
1839 }
1840
1841 void MetaspaceShared::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1842 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1843 }
1844
1845 // Update a Java object to point its Klass* to the new location after
1846 // shared archive has been compacted.
1847 void MetaspaceShared::relocate_klass_ptr(oop o) {
1848 assert(DumpSharedSpaces, "sanity");
1849 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1850 o->set_klass(k);
1851 }
1852
1853 Klass* MetaspaceShared::get_relocated_klass(Klass *k, bool is_final) {
1854 assert(DumpSharedSpaces, "sanity");
1855 k = ArchiveCompactor::get_relocated_klass(k);
1856 if (is_final) {
1857 k = (Klass*)(address(k) + final_delta());
1858 }
1859 return k;
1860 }
1861
1862 Symbol* MetaspaceShared::get_relocated_symbol(Symbol* orig_symbol) {
1863 return ArchiveCompactor::get_relocated_symbol(orig_symbol);
1864 }
1865
1866 class LinkSharedClassesClosure : public KlassClosure {
1867 Thread* THREAD;
1868 bool _made_progress;
1869 public:
1870 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1871
1872 void reset() { _made_progress = false; }
1873 bool made_progress() const { return _made_progress; }
1874
1875 void do_klass(Klass* k) {
1876 if (k->is_instance_klass()) {
1877 InstanceKlass* ik = InstanceKlass::cast(k);
1878 // For dynamic CDS dump, only link classes loaded by the builtin class loaders.
1879 bool do_linking = DumpSharedSpaces ? true : !ik->is_shared_unregistered_class();
1880 if (do_linking) {
1881 // Link the class to cause the bytecodes to be rewritten and the
1882 // cpcache to be created. Class verification is done according
1883 // to -Xverify setting.
1884 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1885 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1886
1887 if (DumpSharedSpaces) {
1888 // The following function is used to resolve all Strings in the statically
1889 // dumped classes to archive all the Strings. The archive heap is not supported
1890 // for the dynamic archive.
1891 ik->constants()->resolve_class_constants(THREAD);
1892 }
1893 }
1894 }
1895 }
1896 };
1897
1898 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1899 // We need to iterate because verification may cause additional classes
1900 // to be loaded.
1901 LinkSharedClassesClosure link_closure(THREAD);
1902 do {
1903 link_closure.reset();
1904 ClassLoaderDataGraph::unlocked_loaded_classes_do(&link_closure);
1905 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1906 } while (link_closure.made_progress());
1907 }
1908
1909 void MetaspaceShared::prepare_for_dumping() {
1910 Arguments::check_unsupported_dumping_properties();
1911 ClassLoader::initialize_shared_path();
1912 }
1913
1914 // Preload classes from a list, populate the shared spaces and dump to a
1915 // file.
1916 void MetaspaceShared::preload_and_dump(TRAPS) {
1917 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1918 ResourceMark rm(THREAD);
1919 char class_list_path_str[JVM_MAXPATHLEN];
1920 // Preload classes to be shared.
1921 const char* class_list_path;
1922 if (SharedClassListFile == NULL) {
1923 // Construct the path to the class list (in jre/lib)
1924 // Walk up two directories from the location of the VM and
1925 // optionally tack on "lib" (depending on platform)
1926 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1927 for (int i = 0; i < 3; i++) {
1928 char *end = strrchr(class_list_path_str, *os::file_separator());
1929 if (end != NULL) *end = '\0';
1930 }
1931 int class_list_path_len = (int)strlen(class_list_path_str);
1932 if (class_list_path_len >= 3) {
1933 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1934 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1935 jio_snprintf(class_list_path_str + class_list_path_len,
1936 sizeof(class_list_path_str) - class_list_path_len,
1937 "%slib", os::file_separator());
1938 class_list_path_len += 4;
1939 }
1940 }
1941 }
1942 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1943 jio_snprintf(class_list_path_str + class_list_path_len,
1944 sizeof(class_list_path_str) - class_list_path_len,
1945 "%sclasslist", os::file_separator());
1946 }
1947 class_list_path = class_list_path_str;
1948 } else {
1949 class_list_path = SharedClassListFile;
1950 }
1951
1952 log_info(cds)("Loading classes to share ...");
1953 _has_error_classes = false;
1954 int class_count = preload_classes(class_list_path, THREAD);
1955 if (ExtraSharedClassListFile) {
1956 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1957 }
1958 log_info(cds)("Loading classes to share: done.");
1959
1960 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1961
1962 if (SharedArchiveConfigFile) {
1963 log_info(cds)("Reading extra data from %s ...", SharedArchiveConfigFile);
1964 read_extra_data(SharedArchiveConfigFile, THREAD);
1965 }
1966 log_info(cds)("Reading extra data: done.");
1967
1968 HeapShared::init_subgraph_entry_fields(THREAD);
1969
1970 // Rewrite and link classes
1971 log_info(cds)("Rewriting and linking classes ...");
1972
1973 // Link any classes which got missed. This would happen if we have loaded classes that
1974 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1975 // fails verification, all other interfaces that were not specified in the classlist but
1976 // are implemented by K are not verified.
1977 link_and_cleanup_shared_classes(CATCH);
1978 log_info(cds)("Rewriting and linking classes: done");
1979
1980 #if INCLUDE_CDS_JAVA_HEAP
1981 if (use_full_module_graph()) {
1982 HeapShared::reset_archived_object_states(THREAD);
1983 }
1984 #endif
1985
1986 VM_PopulateDumpSharedSpace op;
1987 MutexLocker ml(THREAD, HeapShared::is_heap_object_archiving_allowed() ?
1988 Heap_lock : NULL); // needed by HeapShared::run_gc()
1989 VMThread::execute(&op);
1990 }
1991 }
1992
1993
1994 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1995 ClassListParser parser(class_list_path);
1996 int class_count = 0;
1997
1998 while (parser.parse_one_line()) {
1999 Klass* klass = parser.load_current_class(THREAD);
2000 if (HAS_PENDING_EXCEPTION) {
2001 if (klass == NULL &&
2002 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
2003 // print a warning only when the pending exception is class not found
2004 log_warning(cds)("Preload Warning: Cannot find %s", parser.current_class_name());
2005 }
2006 CLEAR_PENDING_EXCEPTION;
2007 }
2008 if (klass != NULL) {
2009 if (log_is_enabled(Trace, cds)) {
2010 ResourceMark rm(THREAD);
2011 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
2012 }
2013
2014 if (klass->is_instance_klass()) {
2015 InstanceKlass* ik = InstanceKlass::cast(klass);
2016
2017 // Link the class to cause the bytecodes to be rewritten and the
2018 // cpcache to be created. The linking is done as soon as classes
2019 // are loaded in order that the related data structures (klass and
2020 // cpCache) are located together.
2021 try_link_class(ik, THREAD);
2022 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
2023 }
2024
2025 class_count++;
2026 }
2027 }
2028
2029 return class_count;
2030 }
2031
2032 // Returns true if the class's status has changed
2033 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
2034 Arguments::assert_is_dumping_archive();
2035 if (ik->init_state() < InstanceKlass::linked &&
2036 !SystemDictionaryShared::has_class_failed_verification(ik)) {
2037 bool saved = BytecodeVerificationLocal;
2038 if (ik->is_shared_unregistered_class() && ik->class_loader() == NULL) {
2039 // The verification decision is based on BytecodeVerificationRemote
2040 // for non-system classes. Since we are using the NULL classloader
2041 // to load non-system classes for customized class loaders during dumping,
2042 // we need to temporarily change BytecodeVerificationLocal to be the same as
2043 // BytecodeVerificationRemote. Note this can cause the parent system
2044 // classes also being verified. The extra overhead is acceptable during
2045 // dumping.
2046 BytecodeVerificationLocal = BytecodeVerificationRemote;
2047 }
2048 ik->link_class(THREAD);
2049 if (HAS_PENDING_EXCEPTION) {
2050 ResourceMark rm(THREAD);
2051 log_warning(cds)("Preload Warning: Verification failed for %s",
2052 ik->external_name());
2053 CLEAR_PENDING_EXCEPTION;
2054 SystemDictionaryShared::set_class_has_failed_verification(ik);
2055 _has_error_classes = true;
2056 }
2057 BytecodeVerificationLocal = saved;
2058 return true;
2059 } else {
2060 return false;
2061 }
2062 }
2063
2064 #if INCLUDE_CDS_JAVA_HEAP
2065 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
2066 // The closed and open archive heap space has maximum two regions.
2067 // See FileMapInfo::write_archive_heap_regions() for details.
2068 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
2069 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
2070 HeapShared::archive_java_heap_objects(_closed_archive_heap_regions,
2071 _open_archive_heap_regions);
2072 ArchiveCompactor::OtherROAllocMark mark;
2073 HeapShared::write_subgraph_info_table();
2074 }
2075
2076 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
2077 if (HeapShared::is_heap_object_archiving_allowed()) {
2078 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
2079 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
2080
2081 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
2082 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
2083 }
2084 }
2085
2086 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
2087 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
2088 for (int i=0; i<regions->length(); i++) {
2089 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
2090 size_t size_in_bits = oopmap.size();
2091 size_t size_in_bytes = oopmap.size_in_bytes();
2092 uintptr_t* buffer = (uintptr_t*)NEW_C_HEAP_ARRAY(char, size_in_bytes, mtInternal);
2093 oopmap.write_to(buffer, size_in_bytes);
2094 log_info(cds, heap)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region "
2095 INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)",
2096 p2i(buffer), size_in_bytes,
2097 p2i(regions->at(i).start()), regions->at(i).byte_size());
2098
2099 ArchiveHeapOopmapInfo info;
2100 info._oopmap = (address)buffer;
2101 info._oopmap_size_in_bits = size_in_bits;
2102 info._oopmap_size_in_bytes = size_in_bytes;
2103 oopmaps->append(info);
2104 }
2105 }
2106 #endif // INCLUDE_CDS_JAVA_HEAP
2107
2108 void ReadClosure::do_ptr(void** p) {
2109 assert(*p == NULL, "initializing previous initialized pointer.");
2110 intptr_t obj = nextPtr();
2111 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
2112 "hit tag while initializing ptrs.");
2113 *p = (void*)obj;
2114 }
2115
2116 void ReadClosure::do_u4(u4* p) {
2117 intptr_t obj = nextPtr();
2118 *p = (u4)(uintx(obj));
2119 }
2120
2121 void ReadClosure::do_bool(bool* p) {
2122 intptr_t obj = nextPtr();
2123 *p = (bool)(uintx(obj));
2124 }
2125
2126 void ReadClosure::do_tag(int tag) {
2127 int old_tag;
2128 old_tag = (int)(intptr_t)nextPtr();
2129 // do_int(&old_tag);
2130 assert(tag == old_tag, "old tag doesn't match");
2131 FileMapInfo::assert_mark(tag == old_tag);
2132 }
2133
2134 void ReadClosure::do_oop(oop *p) {
2135 narrowOop o = (narrowOop)nextPtr();
2136 if (o == 0 || !HeapShared::open_archive_heap_region_mapped()) {
2137 p = NULL;
2138 } else {
2139 assert(HeapShared::is_heap_object_archiving_allowed(),
2140 "Archived heap object is not allowed");
2141 assert(HeapShared::open_archive_heap_region_mapped(),
2142 "Open archive heap region is not mapped");
2143 *p = HeapShared::decode_from_archive(o);
2144 }
2145 }
2146
2147 void ReadClosure::do_region(u_char* start, size_t size) {
2148 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
2149 assert(size % sizeof(intptr_t) == 0, "bad size");
2150 do_tag((int)size);
2151 while (size > 0) {
2152 *(intptr_t*)start = nextPtr();
2153 start += sizeof(intptr_t);
2154 size -= sizeof(intptr_t);
2155 }
2156 }
2157
2158 void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
2159 assert(base <= static_top && static_top <= top, "must be");
2160 _shared_metaspace_static_top = static_top;
2161 MetaspaceObj::set_shared_metaspace_range(base, top);
2162 }
2163
2164 // Return true if given address is in the misc data region
2165 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
2166 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
2167 }
2168
2169 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
2170 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
2171 return true;
2172 }
2173 return false;
2174 }
2175
2176 bool MetaspaceShared::is_shared_dynamic(void* p) {
2177 if ((p < MetaspaceObj::shared_metaspace_top()) &&
2178 (p >= _shared_metaspace_static_top)) {
2179 return true;
2180 } else {
2181 return false;
2182 }
2183 }
2184
2185 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
2186 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
2187 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
2188
2189 FileMapInfo* static_mapinfo = open_static_archive();
2190 FileMapInfo* dynamic_mapinfo = NULL;
2191
2192 if (static_mapinfo != NULL) {
2193 dynamic_mapinfo = open_dynamic_archive();
2194
2195 // First try to map at the requested address
2196 result = map_archives(static_mapinfo, dynamic_mapinfo, true);
2197 if (result == MAP_ARCHIVE_MMAP_FAILURE) {
2198 // Mapping has failed (probably due to ASLR). Let's map at an address chosen
2199 // by the OS.
2200 log_info(cds)("Try to map archive(s) at an alternative address");
2201 result = map_archives(static_mapinfo, dynamic_mapinfo, false);
2202 }
2203 }
2204
2205 if (result == MAP_ARCHIVE_SUCCESS) {
2206 bool dynamic_mapped = (dynamic_mapinfo != NULL && dynamic_mapinfo->is_mapped());
2207 char* cds_base = static_mapinfo->mapped_base();
2208 char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
2209 set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
2210 _relocation_delta = static_mapinfo->relocation_delta();
2211 if (dynamic_mapped) {
2212 FileMapInfo::set_shared_path_table(dynamic_mapinfo);
2213 } else {
2214 FileMapInfo::set_shared_path_table(static_mapinfo);
2215 }
2216 _requested_base_address = static_mapinfo->requested_base_address();
2217 } else {
2218 set_shared_metaspace_range(NULL, NULL, NULL);
2219 UseSharedSpaces = false;
2220 FileMapInfo::fail_continue("Unable to map shared spaces");
2221 if (PrintSharedArchiveAndExit) {
2222 vm_exit_during_initialization("Unable to use shared archive.");
2223 }
2224 }
2225
2226 if (static_mapinfo != NULL && !static_mapinfo->is_mapped()) {
2227 delete static_mapinfo;
2228 }
2229 if (dynamic_mapinfo != NULL && !dynamic_mapinfo->is_mapped()) {
2230 delete dynamic_mapinfo;
2231 }
2232 }
2233
2234 FileMapInfo* MetaspaceShared::open_static_archive() {
2235 FileMapInfo* mapinfo = new FileMapInfo(true);
2236 if (!mapinfo->initialize()) {
2237 delete(mapinfo);
2238 return NULL;
2239 }
2240 return mapinfo;
2241 }
2242
2243 FileMapInfo* MetaspaceShared::open_dynamic_archive() {
2244 if (DynamicDumpSharedSpaces) {
2245 return NULL;
2246 }
2247 if (Arguments::GetSharedDynamicArchivePath() == NULL) {
2248 return NULL;
2249 }
2250
2251 FileMapInfo* mapinfo = new FileMapInfo(false);
2252 if (!mapinfo->initialize()) {
2253 delete(mapinfo);
2254 return NULL;
2255 }
2256 return mapinfo;
2257 }
2258
2259 // use_requested_addr:
2260 // true = map at FileMapHeader::_requested_base_address
2261 // false = map at an alternative address picked by OS.
2262 MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
2263 bool use_requested_addr) {
2264 if (use_requested_addr && static_mapinfo->requested_base_address() == NULL) {
2265 log_info(cds)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
2266 return MAP_ARCHIVE_MMAP_FAILURE;
2267 }
2268
2269 PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
2270 // For product build only -- this is for benchmarking the cost of doing relocation.
2271 // For debug builds, the check is done below, after reserving the space, for better test coverage
2272 // (see comment below).
2273 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
2274 return MAP_ARCHIVE_MMAP_FAILURE;
2275 });
2276
2277 if (ArchiveRelocationMode == 2 && !use_requested_addr) {
2278 log_info(cds)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
2279 return MAP_ARCHIVE_MMAP_FAILURE;
2280 };
2281
2282 if (dynamic_mapinfo != NULL) {
2283 // Ensure that the OS won't be able to allocate new memory spaces between the two
2284 // archives, or else it would mess up the simple comparision in MetaspaceObj::is_shared().
2285 assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
2286 }
2287
2288 ReservedSpace archive_space_rs, class_space_rs;
2289 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
2290 char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo, dynamic_mapinfo,
2291 use_requested_addr, archive_space_rs,
2292 class_space_rs);
2293 if (mapped_base_address == NULL) {
2294 result = MAP_ARCHIVE_MMAP_FAILURE;
2295 log_debug(cds)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
2296 } else {
2297
2298 #ifdef ASSERT
2299 // Some sanity checks after reserving address spaces for archives
2300 // and class space.
2301 assert(archive_space_rs.is_reserved(), "Sanity");
2302 if (Metaspace::using_class_space()) {
2303 // Class space must closely follow the archive space. Both spaces
2304 // must be aligned correctly.
2305 assert(class_space_rs.is_reserved(),
2306 "A class space should have been reserved");
2307 assert(class_space_rs.base() >= archive_space_rs.end(),
2308 "class space should follow the cds archive space");
2309 assert(is_aligned(archive_space_rs.base(),
2310 MetaspaceShared::reserved_space_alignment()),
2311 "Archive space misaligned");
2312 assert(is_aligned(class_space_rs.base(),
2313 Metaspace::reserve_alignment()),
2314 "class space misaligned");
2315 }
2316 #endif // ASSERT
2317
2318 log_debug(cds)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
2319 p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size());
2320 log_debug(cds)("Reserved class_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
2321 p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
2322
2323 if (MetaspaceShared::use_windows_memory_mapping()) {
2324 // We have now reserved address space for the archives, and will map in
2325 // the archive files into this space.
2326 //
2327 // Special handling for Windows: on Windows we cannot map a file view
2328 // into an existing memory mapping. So, we unmap the address range we
2329 // just reserved again, which will make it available for mapping the
2330 // archives.
2331 // Reserving this range has not been for naught however since it makes
2332 // us reasonably sure the address range is available.
2333 //
2334 // But still it may fail, since between unmapping the range and mapping
2335 // in the archive someone else may grab the address space. Therefore
2336 // there is a fallback in FileMap::map_region() where we just read in
2337 // the archive files sequentially instead of mapping it in. We couple
2338 // this with use_requested_addr, since we're going to patch all the
2339 // pointers anyway so there's no benefit to mmap.
2340 if (use_requested_addr) {
2341 log_info(cds)("Windows mmap workaround: releasing archive space.");
2342 archive_space_rs.release();
2343 }
2344 }
2345 MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
2346 MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
2347 map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
2348
2349 DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
2350 // This is for simulating mmap failures at the requested address. In
2351 // debug builds, we do it here (after all archives have possibly been
2352 // mapped), so we can thoroughly test the code for failure handling
2353 // (releasing all allocated resource, etc).
2354 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
2355 if (static_result == MAP_ARCHIVE_SUCCESS) {
2356 static_result = MAP_ARCHIVE_MMAP_FAILURE;
2357 }
2358 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
2359 dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
2360 }
2361 });
2362
2363 if (static_result == MAP_ARCHIVE_SUCCESS) {
2364 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
2365 result = MAP_ARCHIVE_SUCCESS;
2366 } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
2367 assert(dynamic_mapinfo != NULL && !dynamic_mapinfo->is_mapped(), "must have failed");
2368 // No need to retry mapping the dynamic archive again, as it will never succeed
2369 // (bad file, etc) -- just keep the base archive.
2370 log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
2371 dynamic_mapinfo->full_path());
2372 result = MAP_ARCHIVE_SUCCESS;
2373 // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
2374 // easy API to do that right now.
2375 } else {
2376 result = MAP_ARCHIVE_MMAP_FAILURE;
2377 }
2378 } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
2379 result = MAP_ARCHIVE_OTHER_FAILURE;
2380 } else {
2381 result = MAP_ARCHIVE_MMAP_FAILURE;
2382 }
2383 }
2384
2385 if (result == MAP_ARCHIVE_SUCCESS) {
2386 SharedBaseAddress = (size_t)mapped_base_address;
2387 LP64_ONLY({
2388 if (Metaspace::using_class_space()) {
2389 // Set up ccs in metaspace.
2390 Metaspace::initialize_class_space(class_space_rs);
2391
2392 // Set up compressed Klass pointer encoding: the encoding range must
2393 // cover both archive and class space.
2394 address cds_base = (address)static_mapinfo->mapped_base();
2395 address ccs_end = (address)class_space_rs.end();
2396 CompressedKlassPointers::initialize(cds_base, ccs_end - cds_base);
2397
2398 // map_heap_regions() compares the current narrow oop and klass encodings
2399 // with the archived ones, so it must be done after all encodings are determined.
2400 static_mapinfo->map_heap_regions();
2401 }
2402 });
2403 log_info(cds)("optimized module handling: %s", MetaspaceShared::use_optimized_module_handling() ? "enabled" : "disabled");
2404 log_info(cds)("full module graph: %s", MetaspaceShared::use_full_module_graph() ? "enabled" : "disabled");
2405 } else {
2406 unmap_archive(static_mapinfo);
2407 unmap_archive(dynamic_mapinfo);
2408 release_reserved_spaces(archive_space_rs, class_space_rs);
2409 }
2410
2411 return result;
2412 }
2413
2414
2415 // This will reserve two address spaces suitable to house Klass structures, one
2416 // for the cds archives (static archive and optionally dynamic archive) and
2417 // optionally one move for ccs.
2418 //
2419 // Since both spaces must fall within the compressed class pointer encoding
2420 // range, they are allocated close to each other.
2421 //
2422 // Space for archives will be reserved first, followed by a potential gap,
2423 // followed by the space for ccs:
2424 //
2425 // +-- Base address A B End
2426 // | | | |
2427 // v v v v
2428 // +-------------+--------------+ +----------------------+
2429 // | static arc | [dyn. arch] | [gap] | compr. class space |
2430 // +-------------+--------------+ +----------------------+
2431 //
2432 // (The gap may result from different alignment requirements between metaspace
2433 // and CDS)
2434 //
2435 // If UseCompressedClassPointers is disabled, only one address space will be
2436 // reserved:
2437 //
2438 // +-- Base address End
2439 // | |
2440 // v v
2441 // +-------------+--------------+
2442 // | static arc | [dyn. arch] |
2443 // +-------------+--------------+
2444 //
2445 // Base address: If use_archive_base_addr address is true, the Base address is
2446 // determined by the address stored in the static archive. If
2447 // use_archive_base_addr address is false, this base address is determined
2448 // by the platform.
2449 //
2450 // If UseCompressedClassPointers=1, the range encompassing both spaces will be
2451 // suitable to en/decode narrow Klass pointers: the base will be valid for
2452 // encoding, the range [Base, End) not surpass KlassEncodingMetaspaceMax.
2453 //
2454 // Return:
2455 //
2456 // - On success:
2457 // - archive_space_rs will be reserved and large enough to host static and
2458 // if needed dynamic archive: [Base, A).
2459 // archive_space_rs.base and size will be aligned to CDS reserve
2460 // granularity.
2461 // - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
2462 // be reserved. Its start address will be aligned to metaspace reserve
2463 // alignment, which may differ from CDS alignment. It will follow the cds
2464 // archive space, close enough such that narrow class pointer encoding
2465 // covers both spaces.
2466 // If UseCompressedClassPointers=0, class_space_rs remains unreserved.
2467 // - On error: NULL is returned and the spaces remain unreserved.
2468 char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
2469 FileMapInfo* dynamic_mapinfo,
2470 bool use_archive_base_addr,
2471 ReservedSpace& archive_space_rs,
2472 ReservedSpace& class_space_rs) {
2473
2474 address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : NULL);
2475 const size_t archive_space_alignment = MetaspaceShared::reserved_space_alignment();
2476
2477 // Size and requested location of the archive_space_rs (for both static and dynamic archives)
2478 assert(static_mapinfo->mapping_base_offset() == 0, "Must be");
2479 size_t archive_end_offset = (dynamic_mapinfo == NULL) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
2480 size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
2481
2482 // If a base address is given, it must have valid alignment and be suitable as encoding base.
2483 if (base_address != NULL) {
2484 assert(is_aligned(base_address, archive_space_alignment),
2485 "Archive base address invalid: " PTR_FORMAT ".", p2i(base_address));
2486 if (Metaspace::using_class_space()) {
2487 assert(CompressedKlassPointers::is_valid_base(base_address),
2488 "Archive base address invalid: " PTR_FORMAT ".", p2i(base_address));
2489 }
2490 }
2491
2492 if (!Metaspace::using_class_space()) {
2493 // Get the simple case out of the way first:
2494 // no compressed class space, simple allocation.
2495 archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
2496 false /* bool large */, (char*)base_address);
2497 if (archive_space_rs.is_reserved()) {
2498 assert(base_address == NULL ||
2499 (address)archive_space_rs.base() == base_address, "Sanity");
2500 // Register archive space with NMT.
2501 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
2502 return archive_space_rs.base();
2503 }
2504 return NULL;
2505 }
2506
2507 #ifdef _LP64
2508
2509 // Complex case: two spaces adjacent to each other, both to be addressable
2510 // with narrow class pointers.
2511 // We reserve the whole range spanning both spaces, then split that range up.
2512
2513 const size_t class_space_alignment = Metaspace::reserve_alignment();
2514
2515 // To simplify matters, lets assume that metaspace alignment will always be
2516 // equal or a multiple of archive alignment.
2517 assert(is_power_of_2(class_space_alignment) &&
2518 is_power_of_2(archive_space_alignment) &&
2519 class_space_alignment >= archive_space_alignment,
2520 "Sanity");
2521
2522 const size_t class_space_size = CompressedClassSpaceSize;
2523 assert(CompressedClassSpaceSize > 0 &&
2524 is_aligned(CompressedClassSpaceSize, class_space_alignment),
2525 "CompressedClassSpaceSize malformed: "
2526 SIZE_FORMAT, CompressedClassSpaceSize);
2527
2528 const size_t ccs_begin_offset = align_up(base_address + archive_space_size,
2529 class_space_alignment) - base_address;
2530 const size_t gap_size = ccs_begin_offset - archive_space_size;
2531
2532 const size_t total_range_size =
2533 align_up(archive_space_size + gap_size + class_space_size,
2534 os::vm_allocation_granularity());
2535
2536 ReservedSpace total_rs;
2537 if (base_address != NULL) {
2538 // Reserve at the given archive base address, or not at all.
2539 total_rs = ReservedSpace(total_range_size, archive_space_alignment,
2540 false /* bool large */, (char*) base_address);
2541 } else {
2542 // Reserve at any address, but leave it up to the platform to choose a good one.
2543 total_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size);
2544 }
2545
2546 if (!total_rs.is_reserved()) {
2547 return NULL;
2548 }
2549
2550 // Paranoid checks:
2551 assert(base_address == NULL || (address)total_rs.base() == base_address,
2552 "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_rs.base()));
2553 assert(is_aligned(total_rs.base(), archive_space_alignment), "Sanity");
2554 assert(total_rs.size() == total_range_size, "Sanity");
2555 assert(CompressedKlassPointers::is_valid_base((address)total_rs.base()), "Sanity");
2556
2557 // Now split up the space into ccs and cds archive. For simplicity, just leave
2558 // the gap reserved at the end of the archive space.
2559 archive_space_rs = total_rs.first_part(ccs_begin_offset,
2560 (size_t)os::vm_allocation_granularity(),
2561 /*split=*/true);
2562 class_space_rs = total_rs.last_part(ccs_begin_offset);
2563
2564 assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
2565 assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
2566 assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
2567 assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
2568
2569 // NMT: fix up the space tags
2570 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
2571 MemTracker::record_virtual_memory_type(class_space_rs.base(), mtClass);
2572
2573 return archive_space_rs.base();
2574
2575 #else
2576 ShouldNotReachHere();
2577 return NULL;
2578 #endif
2579
2580 }
2581
2582 void MetaspaceShared::release_reserved_spaces(ReservedSpace& archive_space_rs,
2583 ReservedSpace& class_space_rs) {
2584 if (archive_space_rs.is_reserved()) {
2585 log_debug(cds)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
2586 archive_space_rs.release();
2587 }
2588 if (class_space_rs.is_reserved()) {
2589 log_debug(cds)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
2590 class_space_rs.release();
2591 }
2592 }
2593
2594 static int archive_regions[] = {MetaspaceShared::mc,
2595 MetaspaceShared::rw,
2596 MetaspaceShared::ro};
2597 static int archive_regions_count = 3;
2598
2599 MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
2600 assert(UseSharedSpaces, "must be runtime");
2601 if (mapinfo == NULL) {
2602 return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
2603 }
2604
2605 mapinfo->set_is_mapped(false);
2606
2607 if (mapinfo->alignment() != (size_t)os::vm_allocation_granularity()) {
2608 log_error(cds)("Unable to map CDS archive -- os::vm_allocation_granularity() expected: " SIZE_FORMAT
2609 " actual: %d", mapinfo->alignment(), os::vm_allocation_granularity());
2610 return MAP_ARCHIVE_OTHER_FAILURE;
2611 }
2612
2613 MapArchiveResult result =
2614 mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
2615
2616 if (result != MAP_ARCHIVE_SUCCESS) {
2617 unmap_archive(mapinfo);
2618 return result;
2619 }
2620
2621 if (!mapinfo->validate_shared_path_table()) {
2622 unmap_archive(mapinfo);
2623 return MAP_ARCHIVE_OTHER_FAILURE;
2624 }
2625
2626 mapinfo->set_is_mapped(true);
2627 return MAP_ARCHIVE_SUCCESS;
2628 }
2629
2630 void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
2631 assert(UseSharedSpaces, "must be runtime");
2632 if (mapinfo != NULL) {
2633 mapinfo->unmap_regions(archive_regions, archive_regions_count);
2634 mapinfo->set_is_mapped(false);
2635 }
2636 }
2637
2638 // Read the miscellaneous data from the shared file, and
2639 // serialize it out to its various destinations.
2640
2641 void MetaspaceShared::initialize_shared_spaces() {
2642 FileMapInfo *static_mapinfo = FileMapInfo::current_info();
2643 _i2i_entry_code_buffers = static_mapinfo->i2i_entry_code_buffers();
2644 _i2i_entry_code_buffers_size = static_mapinfo->i2i_entry_code_buffers_size();
2645 char* buffer = static_mapinfo->cloned_vtables();
2646 clone_cpp_vtables((intptr_t*)buffer);
2647
2648 // Verify various attributes of the archive, plus initialize the
2649 // shared string/symbol tables
2650 buffer = static_mapinfo->serialized_data();
2651 intptr_t* array = (intptr_t*)buffer;
2652 ReadClosure rc(&array);
2653 serialize(&rc);
2654
2655 // Initialize the run-time symbol table.
2656 SymbolTable::create_table();
2657
2658 static_mapinfo->patch_archived_heap_embedded_pointers();
2659
2660 // Close the mapinfo file
2661 static_mapinfo->close();
2662
2663 static_mapinfo->unmap_region(MetaspaceShared::bm);
2664
2665 FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
2666 if (dynamic_mapinfo != NULL) {
2667 intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
2668 ReadClosure rc(&buffer);
2669 SymbolTable::serialize_shared_table_header(&rc, false);
2670 SystemDictionaryShared::serialize_dictionary_headers(&rc, false);
2671 dynamic_mapinfo->close();
2672 }
2673
2674 if (PrintSharedArchiveAndExit) {
2675 if (PrintSharedDictionary) {
2676 tty->print_cr("\nShared classes:\n");
2677 SystemDictionaryShared::print_on(tty);
2678 }
2679 if (FileMapInfo::current_info() == NULL || _archive_loading_failed) {
2680 tty->print_cr("archive is invalid");
2681 vm_exit(1);
2682 } else {
2683 tty->print_cr("archive is valid");
2684 vm_exit(0);
2685 }
2686 }
2687 }
2688
2689 // JVM/TI RedefineClasses() support:
2690 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2691 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2692
2693 if (UseSharedSpaces) {
2694 // remap the shared readonly space to shared readwrite, private
2695 FileMapInfo* mapinfo = FileMapInfo::current_info();
2696 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2697 return false;
2698 }
2699 if (FileMapInfo::dynamic_info() != NULL) {
2700 mapinfo = FileMapInfo::dynamic_info();
2701 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2702 return false;
2703 }
2704 }
2705 _remapped_readwrite = true;
2706 }
2707 return true;
2708 }
2709
2710 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2711 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2712 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2713 // or so.
2714 _mc_region.print_out_of_space_msg(name, needed_bytes);
2715 _rw_region.print_out_of_space_msg(name, needed_bytes);
2716 _ro_region.print_out_of_space_msg(name, needed_bytes);
2717
2718 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2719 "Please reduce the number of shared classes.");
2720 }
2721
2722 // This is used to relocate the pointers so that the base archive can be mapped at
2723 // MetaspaceShared::requested_base_address() without runtime relocation.
2724 intx MetaspaceShared::final_delta() {
2725 return intx(MetaspaceShared::requested_base_address()) // We want the base archive to be mapped to here at runtime
2726 - intx(SharedBaseAddress); // .. but the base archive is mapped at here at dump time
2727 }
2728
2729 bool MetaspaceShared::use_full_module_graph() {
2730 return _use_optimized_module_handling && _use_full_module_graph &&
2731 (UseSharedSpaces || DumpSharedSpaces) && HeapShared::is_heap_object_archiving_allowed();
2732 }
2733
2734 void MetaspaceShared::print_on(outputStream* st) {
2735 if (UseSharedSpaces || DumpSharedSpaces) {
2736 st->print("CDS archive(s) mapped at: ");
2737 address base;
2738 address top;
2739 if (UseSharedSpaces) { // Runtime
2740 base = (address)MetaspaceObj::shared_metaspace_base();
2741 address static_top = (address)_shared_metaspace_static_top;
2742 top = (address)MetaspaceObj::shared_metaspace_top();
2743 st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
2744 } else if (DumpSharedSpaces) { // Dump Time
2745 base = (address)_shared_rs.base();
2746 top = (address)_shared_rs.end();
2747 st->print("[" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(top));
2748 }
2749 st->print("size " SIZE_FORMAT ", ", top - base);
2750 st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, (int)ArchiveRelocationMode);
2751 } else {
2752 st->print("CDS disabled.");
2753 }
2754 st->cr();
2755 }