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