1/*
2 * Copyright (c) 2012, 2019, 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/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 "memory/dynamicArchive.hpp"
52#include "oops/compressedOops.inline.hpp"
53#include "oops/instanceClassLoaderKlass.hpp"
54#include "oops/instanceMirrorKlass.hpp"
55#include "oops/instanceRefKlass.hpp"
56#include "oops/methodData.hpp"
57#include "oops/objArrayKlass.hpp"
58#include "oops/objArrayOop.hpp"
59#include "oops/oop.inline.hpp"
60#include "oops/typeArrayKlass.hpp"
61#include "prims/jvmtiRedefineClasses.hpp"
62#include "runtime/handles.inline.hpp"
63#include "runtime/os.hpp"
64#include "runtime/safepointVerifiers.hpp"
65#include "runtime/signature.hpp"
66#include "runtime/timerTrace.hpp"
67#include "runtime/vmThread.hpp"
68#include "runtime/vmOperations.hpp"
69#include "utilities/align.hpp"
70#include "utilities/bitMap.hpp"
71#include "utilities/defaultStream.hpp"
72#include "utilities/hashtable.inline.hpp"
73#if INCLUDE_G1GC
74#include "gc/g1/g1CollectedHeap.hpp"
75#endif
76
77ReservedSpace MetaspaceShared::_shared_rs;
78VirtualSpace MetaspaceShared::_shared_vs;
79MetaspaceSharedStats MetaspaceShared::_stats;
80bool MetaspaceShared::_has_error_classes;
81bool MetaspaceShared::_archive_loading_failed = false;
82bool MetaspaceShared::_remapped_readwrite = false;
83address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
84size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
85size_t MetaspaceShared::_core_spaces_size = 0;
86void* MetaspaceShared::_shared_metaspace_static_top = NULL;
87
88// The CDS archive is divided into the following regions:
89// mc - misc code (the method entry trampolines)
90// rw - read-write metadata
91// ro - read-only metadata and read-only tables
92// md - misc data (the c++ vtables)
93//
94// ca0 - closed archive heap space #0
95// ca1 - closed archive heap space #1 (may be empty)
96// oa0 - open archive heap space #0
97// oa1 - open archive heap space #1 (may be empty)
98//
99// The mc, rw, ro, and md regions are linearly allocated, starting from
100// SharedBaseAddress, in the order of mc->rw->ro->md. The size of these 4 regions
101// are page-aligned, and there's no gap between any consecutive regions.
102//
103// These 4 regions are populated in the following steps:
104// [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
105// temporarily allocated outside of the shared regions. Only the method entry
106// trampolines are written into the mc region.
107// [2] ArchiveCompactor copies RW metadata into the rw region.
108// [3] ArchiveCompactor copies RO metadata into the ro region.
109// [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
110// are copied into the ro region as read-only tables.
111// [5] C++ vtables are copied into the md region.
112//
113// The s0/s1 and oa0/oa1 regions are populated inside HeapShared::archive_java_heap_objects.
114// Their layout is independent of the other 4 regions.
115
116char* DumpRegion::expand_top_to(char* newtop) {
117 assert(is_allocatable(), "must be initialized and not packed");
118 assert(newtop >= _top, "must not grow backwards");
119 if (newtop > _end) {
120 MetaspaceShared::report_out_of_space(_name, newtop - _top);
121 ShouldNotReachHere();
122 }
123 uintx delta;
124 if (DynamicDumpSharedSpaces) {
125 delta = DynamicArchive::object_delta_uintx(newtop);
126 } else {
127 delta = MetaspaceShared::object_delta_uintx(newtop);
128 }
129 if (delta > MAX_SHARED_DELTA) {
130 // This is just a sanity check and should not appear in any real world usage. This
131 // happens only if you allocate more than 2GB of shared objects and would require
132 // millions of shared classes.
133 vm_exit_during_initialization("Out of memory in the CDS archive",
134 "Please reduce the number of shared classes.");
135 }
136
137 MetaspaceShared::commit_shared_space_to(newtop);
138 _top = newtop;
139 return _top;
140}
141
142char* DumpRegion::allocate(size_t num_bytes, size_t alignment) {
143 char* p = (char*)align_up(_top, alignment);
144 char* newtop = p + align_up(num_bytes, alignment);
145 expand_top_to(newtop);
146 memset(p, 0, newtop - p);
147 return p;
148}
149
150void DumpRegion::print(size_t total_bytes) const {
151 tty->print_cr("%-3s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT,
152 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()), p2i(_base));
153}
154
155void DumpRegion::print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
156 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
157 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
158 if (strcmp(_name, failing_region) == 0) {
159 tty->print_cr(" required = %d", int(needed_bytes));
160 } else {
161 tty->cr();
162 }
163}
164
165void DumpRegion::pack(DumpRegion* next) {
166 assert(!is_packed(), "sanity");
167 _end = (char*)align_up(_top, Metaspace::reserve_alignment());
168 _is_packed = true;
169 if (next != NULL) {
170 next->_base = next->_top = this->_end;
171 next->_end = MetaspaceShared::shared_rs()->end();
172 }
173}
174
175DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md");
176size_t _total_closed_archive_region_size = 0, _total_open_archive_region_size = 0;
177
178void MetaspaceShared::init_shared_dump_space(DumpRegion* first_space, address first_space_bottom) {
179 // Start with 0 committed bytes. The memory will be committed as needed by
180 // MetaspaceShared::commit_shared_space_to().
181 if (!_shared_vs.initialize(_shared_rs, 0)) {
182 vm_exit_during_initialization("Unable to allocate memory for shared space");
183 }
184 first_space->init(&_shared_rs, (char*)first_space_bottom);
185}
186
187DumpRegion* MetaspaceShared::misc_code_dump_space() {
188 return &_mc_region;
189}
190
191DumpRegion* MetaspaceShared::read_write_dump_space() {
192 return &_rw_region;
193}
194
195DumpRegion* MetaspaceShared::read_only_dump_space() {
196 return &_ro_region;
197}
198
199void MetaspaceShared::pack_dump_space(DumpRegion* current, DumpRegion* next,
200 ReservedSpace* rs) {
201 current->pack(next);
202}
203
204char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
205 return _mc_region.allocate(num_bytes);
206}
207
208char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
209 return _ro_region.allocate(num_bytes);
210}
211
212void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
213 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
214
215 // If using shared space, open the file that contains the shared space
216 // and map in the memory before initializing the rest of metaspace (so
217 // the addresses don't conflict)
218 FileMapInfo* mapinfo = new FileMapInfo(true);
219
220 // Open the shared archive file, read and validate the header. If
221 // initialization fails, shared spaces [UseSharedSpaces] are
222 // disabled and the file is closed.
223 // Map in spaces now also
224 if (mapinfo->initialize(true) && map_shared_spaces(mapinfo)) {
225 size_t cds_total = core_spaces_size();
226 address cds_address = (address)mapinfo->region_addr(0);
227 char* cds_end = (char *)align_up(cds_address + cds_total,
228 Metaspace::reserve_alignment());
229
230 // Mapping the dynamic archive before allocating the class space
231 cds_end = initialize_dynamic_runtime_shared_spaces((char*)cds_address, cds_end);
232
233#ifdef _LP64
234 if (Metaspace::using_class_space()) {
235 // If UseCompressedClassPointers is set then allocate the metaspace area
236 // above the heap and above the CDS area (if it exists).
237 Metaspace::allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
238 // map_heap_regions() compares the current narrow oop and klass encodings
239 // with the archived ones, so it must be done after all encodings are determined.
240 mapinfo->map_heap_regions();
241 }
242 CompressedKlassPointers::set_range(CompressedClassSpaceSize);
243#endif // _LP64
244 } else {
245 assert(!mapinfo->is_open() && !UseSharedSpaces,
246 "archive file not closed or shared spaces not disabled.");
247 }
248}
249
250char* MetaspaceShared::initialize_dynamic_runtime_shared_spaces(
251 char* static_start, char* static_end) {
252 assert(UseSharedSpaces, "must be runtime");
253 char* cds_end = static_end;
254 if (!DynamicDumpSharedSpaces) {
255 address dynamic_top = DynamicArchive::map();
256 if (dynamic_top != NULL) {
257 assert(dynamic_top > (address)static_start, "Unexpected layout");
258 MetaspaceObj::expand_shared_metaspace_range(dynamic_top);
259 cds_end = (char *)align_up(dynamic_top, Metaspace::reserve_alignment());
260 }
261 }
262 return cds_end;
263}
264
265ReservedSpace* MetaspaceShared::reserve_shared_rs(size_t size, size_t alignment,
266 bool large, char* requested_address) {
267 if (requested_address != NULL) {
268 _shared_rs = ReservedSpace(size, alignment, large, requested_address);
269 } else {
270 _shared_rs = ReservedSpace(size, alignment, large);
271 }
272 return &_shared_rs;
273}
274
275void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() {
276 assert(DumpSharedSpaces, "should be called for dump time only");
277 const size_t reserve_alignment = Metaspace::reserve_alignment();
278 bool large_pages = false; // No large pages when dumping the CDS archive.
279 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment);
280
281#ifdef _LP64
282 // On 64-bit VM, the heap and class space layout will be the same as if
283 // you're running in -Xshare:on mode:
284 //
285 // +-- SharedBaseAddress (default = 0x800000000)
286 // v
287 // +-..---------+---------+ ... +----+----+----+----+---------------+
288 // | Heap | Archive | | MC | RW | RO | MD | class space |
289 // +-..---------+---------+ ... +----+----+----+----+---------------+
290 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB -->|
291 //
292 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
293 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
294#else
295 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space.
296 size_t cds_total = align_down(256*M, reserve_alignment);
297#endif
298
299 // First try to reserve the space at the specified SharedBaseAddress.
300 //_shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base);
301 reserve_shared_rs(cds_total, reserve_alignment, large_pages, shared_base);
302 if (_shared_rs.is_reserved()) {
303 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match");
304 } else {
305 // Get a mmap region anywhere if the SharedBaseAddress fails.
306 //_shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages);
307 reserve_shared_rs(cds_total, reserve_alignment, large_pages, NULL);
308 }
309 if (!_shared_rs.is_reserved()) {
310 vm_exit_during_initialization("Unable to reserve memory for shared space",
311 err_msg(SIZE_FORMAT " bytes.", cds_total));
312 }
313
314#ifdef _LP64
315 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up:
316 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes()
317 // will store Klasses into this space.
318 // + The lower 3 GB is used for the archive -- when preload_classes() is done,
319 // ArchiveCompactor will copy the class metadata into this space, first the RW parts,
320 // then the RO parts.
321
322 assert(UseCompressedOops && UseCompressedClassPointers,
323 "UseCompressedOops and UseCompressedClassPointers must be set");
324
325 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment);
326 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size);
327 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment);
328 _shared_rs = _shared_rs.first_part(max_archive_size);
329
330 // Set up compress class pointers.
331 CompressedKlassPointers::set_base((address)_shared_rs.base());
332 // Set narrow_klass_shift to be LogKlassAlignmentInBytes. This is consistent
333 // with AOT.
334 CompressedKlassPointers::set_shift(LogKlassAlignmentInBytes);
335 // Set the range of klass addresses to 4GB.
336 CompressedKlassPointers::set_range(cds_total);
337
338 Metaspace::initialize_class_space(tmp_class_space);
339 log_info(cds)("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
340 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
341
342 log_info(cds)("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
343 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
344#endif
345
346 init_shared_dump_space(&_mc_region);
347 SharedBaseAddress = (size_t)_shared_rs.base();
348 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
349 _shared_rs.size(), p2i(_shared_rs.base()));
350}
351
352// Called by universe_post_init()
353void MetaspaceShared::post_initialize(TRAPS) {
354 if (UseSharedSpaces) {
355 int size = FileMapInfo::get_number_of_shared_paths();
356 if (size > 0) {
357 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD);
358 if (!DynamicDumpSharedSpaces) {
359 FileMapHeader* header;
360 if (FileMapInfo::dynamic_info() == NULL) {
361 header = FileMapInfo::current_info()->header();
362 } else {
363 header = FileMapInfo::dynamic_info()->header();
364 }
365 ClassLoaderExt::init_paths_start_index(header->_app_class_paths_start_index);
366 ClassLoaderExt::init_app_module_paths_start_index(header->_app_module_paths_start_index);
367 }
368 }
369 }
370}
371
372static GrowableArray<Handle>* _extra_interned_strings = NULL;
373
374void MetaspaceShared::read_extra_data(const char* filename, TRAPS) {
375 _extra_interned_strings = new (ResourceObj::C_HEAP, mtInternal)GrowableArray<Handle>(10000, true);
376
377 HashtableTextDump reader(filename);
378 reader.check_version("VERSION: 1.0");
379
380 while (reader.remain() > 0) {
381 int utf8_length;
382 int prefix_type = reader.scan_prefix(&utf8_length);
383 ResourceMark rm(THREAD);
384 if (utf8_length == 0x7fffffff) {
385 // buf_len will overflown 32-bit value.
386 vm_exit_during_initialization(err_msg("string length too large: %d", utf8_length));
387 }
388 int buf_len = utf8_length+1;
389 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
390 reader.get_utf8(utf8_buffer, utf8_length);
391 utf8_buffer[utf8_length] = '\0';
392
393 if (prefix_type == HashtableTextDump::SymbolPrefix) {
394 SymbolTable::new_permanent_symbol(utf8_buffer);
395 } else{
396 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
397 oop s = StringTable::intern(utf8_buffer, THREAD);
398
399 if (HAS_PENDING_EXCEPTION) {
400 log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
401 reader.last_line_no(), utf8_length);
402 CLEAR_PENDING_EXCEPTION;
403 } else {
404#if INCLUDE_G1GC
405 if (UseG1GC) {
406 typeArrayOop body = java_lang_String::value(s);
407 const HeapRegion* hr = G1CollectedHeap::heap()->heap_region_containing(body);
408 if (hr->is_humongous()) {
409 // Don't keep it alive, so it will be GC'ed before we dump the strings, in order
410 // to maximize free heap space and minimize fragmentation.
411 log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
412 reader.last_line_no(), utf8_length);
413 continue;
414 }
415 }
416#endif
417 // Interned strings are GC'ed if there are no references to it, so let's
418 // add a reference to keep this string alive.
419 assert(s != NULL, "must succeed");
420 Handle h(THREAD, s);
421 _extra_interned_strings->append(h);
422 }
423 }
424 }
425}
426
427void MetaspaceShared::commit_shared_space_to(char* newtop) {
428 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump-time only");
429 char* base = _shared_rs.base();
430 size_t need_committed_size = newtop - base;
431 size_t has_committed_size = _shared_vs.committed_size();
432 if (need_committed_size < has_committed_size) {
433 return;
434 }
435
436 size_t min_bytes = need_committed_size - has_committed_size;
437 size_t preferred_bytes = 1 * M;
438 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size;
439
440 size_t commit =MAX2(min_bytes, preferred_bytes);
441 commit = MIN2(commit, uncommitted);
442 assert(commit <= uncommitted, "sanity");
443
444 bool result = _shared_vs.expand_by(commit, false);
445 if (!result) {
446 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
447 need_committed_size));
448 }
449
450 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
451 commit, _shared_vs.actual_committed_size(), _shared_vs.high());
452}
453
454// Read/write a data stream for restoring/preserving metadata pointers and
455// miscellaneous data from/to the shared archive file.
456
457void MetaspaceShared::serialize(SerializeClosure* soc) {
458 int tag = 0;
459 soc->do_tag(--tag);
460
461 // Verify the sizes of various metadata in the system.
462 soc->do_tag(sizeof(Method));
463 soc->do_tag(sizeof(ConstMethod));
464 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
465 soc->do_tag(sizeof(ConstantPool));
466 soc->do_tag(sizeof(ConstantPoolCache));
467 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
468 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
469 soc->do_tag(sizeof(Symbol));
470
471 // Dump/restore miscellaneous metadata.
472 Universe::serialize(soc);
473 soc->do_tag(--tag);
474
475 // Dump/restore references to commonly used names and signatures.
476 vmSymbols::serialize(soc);
477 soc->do_tag(--tag);
478
479 // Dump/restore the symbol/string/subgraph_info tables
480 SymbolTable::serialize_shared_table_header(soc);
481 StringTable::serialize_shared_table_header(soc);
482 HeapShared::serialize_subgraph_info_table_header(soc);
483 SystemDictionaryShared::serialize_dictionary_headers(soc);
484
485 JavaClasses::serialize_offsets(soc);
486 InstanceMirrorKlass::serialize_offsets(soc);
487 soc->do_tag(--tag);
488
489 serialize_cloned_cpp_vtptrs(soc);
490 soc->do_tag(--tag);
491
492 soc->do_tag(666);
493}
494
495address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
496 if (DumpSharedSpaces) {
497 if (_cds_i2i_entry_code_buffers == NULL) {
498 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
499 _cds_i2i_entry_code_buffers_size = total_size;
500 }
501 } else if (UseSharedSpaces) {
502 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
503 } else {
504 return NULL;
505 }
506
507 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
508 return _cds_i2i_entry_code_buffers;
509}
510
511uintx MetaspaceShared::object_delta_uintx(void* obj) {
512 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
513 "supported only for dumping");
514 if (DumpSharedSpaces) {
515 assert(shared_rs()->contains(obj), "must be");
516 } else {
517 assert(is_in_shared_metaspace(obj) || DynamicArchive::is_in_target_space(obj), "must be");
518 }
519 address base_address = address(SharedBaseAddress);
520 uintx deltax = address(obj) - base_address;
521 return deltax;
522}
523
524// Global object for holding classes that have been loaded. Since this
525// is run at a safepoint just before exit, this is the entire set of classes.
526static GrowableArray<Klass*>* _global_klass_objects;
527
528GrowableArray<Klass*>* MetaspaceShared::collected_klasses() {
529 return _global_klass_objects;
530}
531
532static void collect_array_classes(Klass* k) {
533 _global_klass_objects->append_if_missing(k);
534 if (k->is_array_klass()) {
535 // Add in the array classes too
536 ArrayKlass* ak = ArrayKlass::cast(k);
537 Klass* h = ak->higher_dimension();
538 if (h != NULL) {
539 h->array_klasses_do(collect_array_classes);
540 }
541 }
542}
543
544class CollectClassesClosure : public KlassClosure {
545 void do_klass(Klass* k) {
546 if (k->is_instance_klass() &&
547 SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(k))) {
548 // Don't add to the _global_klass_objects
549 } else {
550 _global_klass_objects->append_if_missing(k);
551 }
552 if (k->is_array_klass()) {
553 // Add in the array classes too
554 ArrayKlass* ak = ArrayKlass::cast(k);
555 Klass* h = ak->higher_dimension();
556 if (h != NULL) {
557 h->array_klasses_do(collect_array_classes);
558 }
559 }
560 }
561};
562
563static void remove_unshareable_in_classes() {
564 for (int i = 0; i < _global_klass_objects->length(); i++) {
565 Klass* k = _global_klass_objects->at(i);
566 if (!k->is_objArray_klass()) {
567 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
568 // on their array classes.
569 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
570 k->remove_unshareable_info();
571 }
572 }
573}
574
575static void remove_java_mirror_in_classes() {
576 for (int i = 0; i < _global_klass_objects->length(); i++) {
577 Klass* k = _global_klass_objects->at(i);
578 if (!k->is_objArray_klass()) {
579 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
580 // on their array classes.
581 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
582 k->remove_java_mirror();
583 }
584 }
585}
586
587static void clear_basic_type_mirrors() {
588 assert(!HeapShared::is_heap_object_archiving_allowed(), "Sanity");
589 Universe::set_int_mirror(NULL);
590 Universe::set_float_mirror(NULL);
591 Universe::set_double_mirror(NULL);
592 Universe::set_byte_mirror(NULL);
593 Universe::set_bool_mirror(NULL);
594 Universe::set_char_mirror(NULL);
595 Universe::set_long_mirror(NULL);
596 Universe::set_short_mirror(NULL);
597 Universe::set_void_mirror(NULL);
598}
599
600static void rewrite_nofast_bytecode(Method* method) {
601 BytecodeStream bcs(method);
602 while (!bcs.is_last_bytecode()) {
603 Bytecodes::Code opcode = bcs.next();
604 switch (opcode) {
605 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
606 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
607 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
608 case Bytecodes::_iload: {
609 if (!bcs.is_wide()) {
610 *bcs.bcp() = Bytecodes::_nofast_iload;
611 }
612 break;
613 }
614 default: break;
615 }
616 }
617}
618
619// Walk all methods in the class list to ensure that they won't be modified at
620// run time. This includes:
621// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
622// at run time by RewriteBytecodes/RewriteFrequentPairs
623// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
624static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
625 for (int i = 0; i < _global_klass_objects->length(); i++) {
626 Klass* k = _global_klass_objects->at(i);
627 if (k->is_instance_klass()) {
628 InstanceKlass* ik = InstanceKlass::cast(k);
629 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(ik);
630 }
631 }
632}
633
634void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(InstanceKlass* ik) {
635 for (int i = 0; i < ik->methods()->length(); i++) {
636 Method* m = ik->methods()->at(i);
637 rewrite_nofast_bytecode(m);
638 Fingerprinter fp(m);
639 // The side effect of this call sets method's fingerprint field.
640 fp.fingerprint();
641 }
642}
643
644// Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
645// (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
646//
647// Addresses of the vtables and the methods may be different across JVM runs,
648// if libjvm.so is dynamically loaded at a different base address.
649//
650// To ensure that the Metadata objects in the CDS archive always have the correct vtable:
651//
652// + at dump time: we redirect the _vptr to point to our own vtables inside
653// the CDS image
654// + at run time: we clone the actual contents of the vtables from libjvm.so
655// into our own tables.
656
657// Currently, the archive contain ONLY the following types of objects that have C++ vtables.
658#define CPP_VTABLE_PATCH_TYPES_DO(f) \
659 f(ConstantPool) \
660 f(InstanceKlass) \
661 f(InstanceClassLoaderKlass) \
662 f(InstanceMirrorKlass) \
663 f(InstanceRefKlass) \
664 f(Method) \
665 f(ObjArrayKlass) \
666 f(TypeArrayKlass)
667
668class CppVtableInfo {
669 intptr_t _vtable_size;
670 intptr_t _cloned_vtable[1];
671public:
672 static int num_slots(int vtable_size) {
673 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
674 }
675 int vtable_size() { return int(uintx(_vtable_size)); }
676 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
677 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
678 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
679 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
680 static size_t byte_size(int vtable_size) {
681 CppVtableInfo i;
682 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
683 }
684};
685
686template <class T> class CppVtableCloner : public T {
687 static intptr_t* vtable_of(Metadata& m) {
688 return *((intptr_t**)&m);
689 }
690 static CppVtableInfo* _info;
691
692 static int get_vtable_length(const char* name);
693
694public:
695 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
696 static intptr_t* allocate(const char* name);
697
698 // Clone the vtable to ...
699 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
700
701 static void zero_vtable_clone() {
702 assert(DumpSharedSpaces, "dump-time only");
703 _info->zero();
704 }
705
706 // Switch the vtable pointer to point to the cloned vtable.
707 static void patch(Metadata* obj) {
708 assert(DumpSharedSpaces, "dump-time only");
709 *(void**)obj = (void*)(_info->cloned_vtable());
710 }
711
712 static bool is_valid_shared_object(const T* obj) {
713 intptr_t* vptr = *(intptr_t**)obj;
714 return vptr == _info->cloned_vtable();
715 }
716};
717
718template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
719
720template <class T>
721intptr_t* CppVtableCloner<T>::allocate(const char* name) {
722 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
723 int n = get_vtable_length(name);
724 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
725 _info->set_vtable_size(n);
726
727 intptr_t* p = clone_vtable(name, _info);
728 assert((char*)p == _md_region.top(), "must be");
729
730 return _info->cloned_vtable();
731}
732
733template <class T>
734intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
735 if (!DumpSharedSpaces) {
736 assert(_info == 0, "_info is initialized only at dump time");
737 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
738 }
739 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
740 int n = info->vtable_size();
741 intptr_t* srcvtable = vtable_of(tmp);
742 intptr_t* dstvtable = info->cloned_vtable();
743
744 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
745 // safe to do memcpy.
746 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
747 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
748 return dstvtable + n;
749}
750
751// To determine the size of the vtable for each type, we use the following
752// trick by declaring 2 subclasses:
753//
754// class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
755// class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
756//
757// CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
758// - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
759// - The first N entries have are exactly the same as in InstanceKlass's vtable.
760// - Their last entry is different.
761//
762// So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
763// and find the first entry that's different.
764//
765// This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
766// esoteric compilers.
767
768template <class T> class CppVtableTesterB: public T {
769public:
770 virtual int last_virtual_method() {return 1;}
771};
772
773template <class T> class CppVtableTesterA : public T {
774public:
775 virtual void* last_virtual_method() {
776 // Make this different than CppVtableTesterB::last_virtual_method so the C++
777 // compiler/linker won't alias the two functions.
778 return NULL;
779 }
780};
781
782template <class T>
783int CppVtableCloner<T>::get_vtable_length(const char* name) {
784 CppVtableTesterA<T> a;
785 CppVtableTesterB<T> b;
786
787 intptr_t* avtable = vtable_of(a);
788 intptr_t* bvtable = vtable_of(b);
789
790 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
791 int vtable_len = 1;
792 for (; ; vtable_len++) {
793 if (avtable[vtable_len] != bvtable[vtable_len]) {
794 break;
795 }
796 }
797 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
798
799 return vtable_len;
800}
801
802#define ALLOC_CPP_VTABLE_CLONE(c) \
803 _cloned_cpp_vtptrs[c##_Kind] = CppVtableCloner<c>::allocate(#c);
804
805#define CLONE_CPP_VTABLE(c) \
806 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
807
808#define ZERO_CPP_VTABLE(c) \
809 CppVtableCloner<c>::zero_vtable_clone();
810
811//------------------------------ for DynamicDumpSharedSpaces - start
812#define DECLARE_CLONED_VTABLE_KIND(c) c ## _Kind,
813
814enum {
815 CPP_VTABLE_PATCH_TYPES_DO(DECLARE_CLONED_VTABLE_KIND)
816 _num_cloned_vtable_kinds
817};
818
819static intptr_t** _cloned_cpp_vtptrs = NULL;
820
821void MetaspaceShared::serialize_cloned_cpp_vtptrs(SerializeClosure* soc) {
822 soc->do_ptr((void**)&_cloned_cpp_vtptrs);
823}
824
825intptr_t* MetaspaceShared::fix_cpp_vtable_for_dynamic_archive(MetaspaceObj::Type msotype, address obj) {
826 assert(DynamicDumpSharedSpaces, "must");
827 int kind = -1;
828 switch (msotype) {
829 case MetaspaceObj::SymbolType:
830 case MetaspaceObj::TypeArrayU1Type:
831 case MetaspaceObj::TypeArrayU2Type:
832 case MetaspaceObj::TypeArrayU4Type:
833 case MetaspaceObj::TypeArrayU8Type:
834 case MetaspaceObj::TypeArrayOtherType:
835 case MetaspaceObj::ConstMethodType:
836 case MetaspaceObj::ConstantPoolCacheType:
837 case MetaspaceObj::AnnotationsType:
838 case MetaspaceObj::MethodCountersType:
839 // These have no vtables.
840 break;
841 case MetaspaceObj::ClassType:
842 {
843 Klass* k = (Klass*)obj;
844 assert(k->is_klass(), "must be");
845 if (k->is_instance_klass()) {
846 kind = InstanceKlass_Kind;
847 } else {
848 assert(k->is_objArray_klass(),
849 "We shouldn't archive any other klasses in DynamicDumpSharedSpaces");
850 kind = ObjArrayKlass_Kind;
851 }
852 }
853 break;
854
855 case MetaspaceObj::MethodType:
856 {
857 Method* m = (Method*)obj;
858 assert(m->is_method(), "must be");
859 kind = Method_Kind;
860 }
861 break;
862
863 case MetaspaceObj::MethodDataType:
864 // We don't archive MethodData <-- should have been removed in removed_unsharable_info
865 ShouldNotReachHere();
866 break;
867
868 case MetaspaceObj::ConstantPoolType:
869 {
870 ConstantPool *cp = (ConstantPool*)obj;
871 assert(cp->is_constantPool(), "must be");
872 kind = ConstantPool_Kind;
873 }
874 break;
875
876 default:
877 ShouldNotReachHere();
878 }
879
880 if (kind >= 0) {
881 assert(kind < _num_cloned_vtable_kinds, "must be");
882 return _cloned_cpp_vtptrs[kind];
883 } else {
884 return NULL;
885 }
886}
887
888//------------------------------ for DynamicDumpSharedSpaces - end
889
890// This can be called at both dump time and run time.
891intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
892 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
893 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
894 return p;
895}
896
897void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
898 assert(DumpSharedSpaces, "dump-time only");
899 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
900}
901
902// Allocate and initialize the C++ vtables, starting from top, but do not go past end.
903void MetaspaceShared::allocate_cpp_vtable_clones() {
904 assert(DumpSharedSpaces, "dump-time only");
905 // Layout (each slot is a intptr_t):
906 // [number of slots in the first vtable = n1]
907 // [ <n1> slots for the first vtable]
908 // [number of slots in the first second = n2]
909 // [ <n2> slots for the second vtable]
910 // ...
911 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
912 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
913}
914
915// Switch the vtable pointer to point to the cloned vtable. We assume the
916// vtable pointer is in first slot in object.
917void MetaspaceShared::patch_cpp_vtable_pointers() {
918 int n = _global_klass_objects->length();
919 for (int i = 0; i < n; i++) {
920 Klass* obj = _global_klass_objects->at(i);
921 if (obj->is_instance_klass()) {
922 InstanceKlass* ik = InstanceKlass::cast(obj);
923 if (ik->is_class_loader_instance_klass()) {
924 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
925 } else if (ik->is_reference_instance_klass()) {
926 CppVtableCloner<InstanceRefKlass>::patch(ik);
927 } else if (ik->is_mirror_instance_klass()) {
928 CppVtableCloner<InstanceMirrorKlass>::patch(ik);
929 } else {
930 CppVtableCloner<InstanceKlass>::patch(ik);
931 }
932 ConstantPool* cp = ik->constants();
933 CppVtableCloner<ConstantPool>::patch(cp);
934 for (int j = 0; j < ik->methods()->length(); j++) {
935 Method* m = ik->methods()->at(j);
936 CppVtableCloner<Method>::patch(m);
937 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
938 }
939 } else if (obj->is_objArray_klass()) {
940 CppVtableCloner<ObjArrayKlass>::patch(obj);
941 } else {
942 assert(obj->is_typeArray_klass(), "sanity");
943 CppVtableCloner<TypeArrayKlass>::patch(obj);
944 }
945 }
946}
947
948bool MetaspaceShared::is_valid_shared_method(const Method* m) {
949 assert(is_in_shared_metaspace(m), "must be");
950 return CppVtableCloner<Method>::is_valid_shared_object(m);
951}
952
953void WriteClosure::do_oop(oop* o) {
954 if (*o == NULL) {
955 _dump_region->append_intptr_t(0);
956 } else {
957 assert(HeapShared::is_heap_object_archiving_allowed(),
958 "Archiving heap object is not allowed");
959 _dump_region->append_intptr_t(
960 (intptr_t)CompressedOops::encode_not_null(*o));
961 }
962}
963
964void WriteClosure::do_region(u_char* start, size_t size) {
965 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
966 assert(size % sizeof(intptr_t) == 0, "bad size");
967 do_tag((int)size);
968 while (size > 0) {
969 _dump_region->append_intptr_t(*(intptr_t*)start);
970 start += sizeof(intptr_t);
971 size -= sizeof(intptr_t);
972 }
973}
974
975// This is for dumping detailed statistics for the allocations
976// in the shared spaces.
977class DumpAllocStats : public ResourceObj {
978public:
979
980 // Here's poor man's enum inheritance
981#define SHAREDSPACE_OBJ_TYPES_DO(f) \
982 METASPACE_OBJ_TYPES_DO(f) \
983 f(SymbolHashentry) \
984 f(SymbolBucket) \
985 f(StringHashentry) \
986 f(StringBucket) \
987 f(Other)
988
989 enum Type {
990 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
991 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
992 _number_of_types
993 };
994
995 static const char * type_name(Type type) {
996 switch(type) {
997 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
998 default:
999 ShouldNotReachHere();
1000 return NULL;
1001 }
1002 }
1003
1004public:
1005 enum { RO = 0, RW = 1 };
1006
1007 int _counts[2][_number_of_types];
1008 int _bytes [2][_number_of_types];
1009
1010 DumpAllocStats() {
1011 memset(_counts, 0, sizeof(_counts));
1012 memset(_bytes, 0, sizeof(_bytes));
1013 };
1014
1015 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
1016 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
1017 int which = (read_only) ? RO : RW;
1018 _counts[which][type] ++;
1019 _bytes [which][type] += byte_size;
1020 }
1021
1022 void record_other_type(int byte_size, bool read_only) {
1023 int which = (read_only) ? RO : RW;
1024 _bytes [which][OtherType] += byte_size;
1025 }
1026 void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
1027};
1028
1029void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
1030 // Calculate size of data that was not allocated by Metaspace::allocate()
1031 MetaspaceSharedStats *stats = MetaspaceShared::stats();
1032
1033 // symbols
1034 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
1035 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
1036
1037 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
1038 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
1039
1040 // strings
1041 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
1042 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
1043
1044 _counts[RO][StringBucketType] = stats->string.bucket_count;
1045 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
1046
1047 // TODO: count things like dictionary, vtable, etc
1048 _bytes[RW][OtherType] += mc_all + md_all;
1049 rw_all += mc_all + md_all; // mc/md are mapped Read/Write
1050
1051 // prevent divide-by-zero
1052 if (ro_all < 1) {
1053 ro_all = 1;
1054 }
1055 if (rw_all < 1) {
1056 rw_all = 1;
1057 }
1058
1059 int all_ro_count = 0;
1060 int all_ro_bytes = 0;
1061 int all_rw_count = 0;
1062 int all_rw_bytes = 0;
1063
1064// To make fmt_stats be a syntactic constant (for format warnings), use #define.
1065#define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
1066 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
1067 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
1068
1069 LogMessage(cds) msg;
1070
1071 msg.info("Detailed metadata info (excluding st regions; rw stats include md/mc regions):");
1072 msg.info("%s", hdr);
1073 msg.info("%s", sep);
1074 for (int type = 0; type < int(_number_of_types); type ++) {
1075 const char *name = type_name((Type)type);
1076 int ro_count = _counts[RO][type];
1077 int ro_bytes = _bytes [RO][type];
1078 int rw_count = _counts[RW][type];
1079 int rw_bytes = _bytes [RW][type];
1080 int count = ro_count + rw_count;
1081 int bytes = ro_bytes + rw_bytes;
1082
1083 double ro_perc = percent_of(ro_bytes, ro_all);
1084 double rw_perc = percent_of(rw_bytes, rw_all);
1085 double perc = percent_of(bytes, ro_all + rw_all);
1086
1087 msg.info(fmt_stats, name,
1088 ro_count, ro_bytes, ro_perc,
1089 rw_count, rw_bytes, rw_perc,
1090 count, bytes, perc);
1091
1092 all_ro_count += ro_count;
1093 all_ro_bytes += ro_bytes;
1094 all_rw_count += rw_count;
1095 all_rw_bytes += rw_bytes;
1096 }
1097
1098 int all_count = all_ro_count + all_rw_count;
1099 int all_bytes = all_ro_bytes + all_rw_bytes;
1100
1101 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1102 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1103 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1104
1105 msg.info("%s", sep);
1106 msg.info(fmt_stats, "Total",
1107 all_ro_count, all_ro_bytes, all_ro_perc,
1108 all_rw_count, all_rw_bytes, all_rw_perc,
1109 all_count, all_bytes, all_perc);
1110
1111 assert(all_ro_bytes == ro_all, "everything should have been counted");
1112 assert(all_rw_bytes == rw_all, "everything should have been counted");
1113
1114#undef fmt_stats
1115}
1116
1117// Populate the shared space.
1118
1119class VM_PopulateDumpSharedSpace: public VM_Operation {
1120private:
1121 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1122 GrowableArray<MemRegion> *_open_archive_heap_regions;
1123
1124 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
1125 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
1126
1127 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1128 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
1129 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1130 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
1131 void dump_symbols();
1132 char* dump_read_only_tables();
1133 void print_region_stats();
1134 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1135 const char *name, const size_t total_size);
1136public:
1137
1138 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1139 void doit(); // outline because gdb sucks
1140 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
1141 bool allow_nested_vm_operations() const { return true; }
1142}; // class VM_PopulateDumpSharedSpace
1143
1144class SortedSymbolClosure: public SymbolClosure {
1145 GrowableArray<Symbol*> _symbols;
1146 virtual void do_symbol(Symbol** sym) {
1147 assert((*sym)->is_permanent(), "archived symbols must be permanent");
1148 _symbols.append(*sym);
1149 }
1150 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
1151 if (a[0] < b[0]) {
1152 return -1;
1153 } else if (a[0] == b[0]) {
1154 return 0;
1155 } else {
1156 return 1;
1157 }
1158 }
1159
1160public:
1161 SortedSymbolClosure() {
1162 SymbolTable::symbols_do(this);
1163 _symbols.sort(compare_symbols_by_address);
1164 }
1165 GrowableArray<Symbol*>* get_sorted_symbols() {
1166 return &_symbols;
1167 }
1168};
1169
1170// ArchiveCompactor --
1171//
1172// This class is the central piece of shared archive compaction -- all metaspace data are
1173// initially allocated outside of the shared regions. ArchiveCompactor copies the
1174// metaspace data into their final location in the shared regions.
1175
1176class ArchiveCompactor : AllStatic {
1177 static const int INITIAL_TABLE_SIZE = 8087;
1178 static const int MAX_TABLE_SIZE = 1000000;
1179
1180 static DumpAllocStats* _alloc_stats;
1181 static SortedSymbolClosure* _ssc;
1182
1183 typedef KVHashtable<address, address, mtInternal> RelocationTable;
1184 static RelocationTable* _new_loc_table;
1185
1186public:
1187 static void initialize() {
1188 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1189 _new_loc_table = new RelocationTable(INITIAL_TABLE_SIZE);
1190 }
1191 static DumpAllocStats* alloc_stats() {
1192 return _alloc_stats;
1193 }
1194
1195 // Use this when you allocate space with MetaspaceShare::read_only_space_alloc()
1196 // outside of ArchiveCompactor::allocate(). These are usually for misc tables
1197 // that are allocated in the RO space.
1198 class OtherROAllocMark {
1199 char* _oldtop;
1200 public:
1201 OtherROAllocMark() {
1202 _oldtop = _ro_region.top();
1203 }
1204 ~OtherROAllocMark() {
1205 char* newtop = _ro_region.top();
1206 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
1207 }
1208 };
1209
1210 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1211 address obj = ref->obj();
1212 int bytes = ref->size() * BytesPerWord;
1213 char* p;
1214 size_t alignment = BytesPerWord;
1215 char* oldtop;
1216 char* newtop;
1217
1218 if (read_only) {
1219 oldtop = _ro_region.top();
1220 p = _ro_region.allocate(bytes, alignment);
1221 newtop = _ro_region.top();
1222 } else {
1223 oldtop = _rw_region.top();
1224 if (ref->msotype() == MetaspaceObj::ClassType) {
1225 // Save a pointer immediate in front of an InstanceKlass, so
1226 // we can do a quick lookup from InstanceKlass* -> RunTimeSharedClassInfo*
1227 // without building another hashtable. See RunTimeSharedClassInfo::get_for()
1228 // in systemDictionaryShared.cpp.
1229 Klass* klass = (Klass*)obj;
1230 if (klass->is_instance_klass()) {
1231 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
1232 _rw_region.allocate(sizeof(address), BytesPerWord);
1233 }
1234 }
1235 p = _rw_region.allocate(bytes, alignment);
1236 newtop = _rw_region.top();
1237 }
1238 memcpy(p, obj, bytes);
1239 assert(_new_loc_table->lookup(obj) == NULL, "each object can be relocated at most once");
1240 _new_loc_table->add(obj, (address)p);
1241 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1242 if (_new_loc_table->maybe_grow(MAX_TABLE_SIZE)) {
1243 log_info(cds, hashtables)("Expanded _new_loc_table to %d", _new_loc_table->table_size());
1244 }
1245 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1246 }
1247
1248 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1249 address* pp = _new_loc_table->lookup(ref->obj());
1250 assert(pp != NULL, "must be");
1251 return *pp;
1252 }
1253
1254private:
1255 // Makes a shallow copy of visited MetaspaceObj's
1256 class ShallowCopier: public UniqueMetaspaceClosure {
1257 bool _read_only;
1258 public:
1259 ShallowCopier(bool read_only) : _read_only(read_only) {}
1260
1261 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1262 if (read_only == _read_only) {
1263 allocate(ref, read_only);
1264 }
1265 return true; // recurse into ref.obj()
1266 }
1267 };
1268
1269 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1270 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1271 public:
1272 virtual bool do_unique_ref(Ref* ref, bool read_only) {
1273 address new_loc = get_new_loc(ref);
1274 RefRelocator refer;
1275 ref->metaspace_pointers_do_at(&refer, new_loc);
1276 return true; // recurse into ref.obj()
1277 }
1278 };
1279
1280 // Relocate a reference to point to its shallow copy
1281 class RefRelocator: public MetaspaceClosure {
1282 public:
1283 virtual bool do_ref(Ref* ref, bool read_only) {
1284 if (ref->not_null()) {
1285 ref->update(get_new_loc(ref));
1286 }
1287 return false; // Do not recurse.
1288 }
1289 };
1290
1291#ifdef ASSERT
1292 class IsRefInArchiveChecker: public MetaspaceClosure {
1293 public:
1294 virtual bool do_ref(Ref* ref, bool read_only) {
1295 if (ref->not_null()) {
1296 char* obj = (char*)ref->obj();
1297 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1298 "must be relocated to point to CDS archive");
1299 }
1300 return false; // Do not recurse.
1301 }
1302 };
1303#endif
1304
1305public:
1306 static void copy_and_compact() {
1307 ResourceMark rm;
1308 SortedSymbolClosure the_ssc; // StackObj
1309 _ssc = &the_ssc;
1310
1311 tty->print_cr("Scanning all metaspace objects ... ");
1312 {
1313 // allocate and shallow-copy RW objects, immediately following the MC region
1314 tty->print_cr("Allocating RW objects ... ");
1315 _mc_region.pack(&_rw_region);
1316
1317 ResourceMark rm;
1318 ShallowCopier rw_copier(false);
1319 iterate_roots(&rw_copier);
1320 }
1321 {
1322 // allocate and shallow-copy of RO object, immediately following the RW region
1323 tty->print_cr("Allocating RO objects ... ");
1324 _rw_region.pack(&_ro_region);
1325
1326 ResourceMark rm;
1327 ShallowCopier ro_copier(true);
1328 iterate_roots(&ro_copier);
1329 }
1330 {
1331 tty->print_cr("Relocating embedded pointers ... ");
1332 ResourceMark rm;
1333 ShallowCopyEmbeddedRefRelocator emb_reloc;
1334 iterate_roots(&emb_reloc);
1335 }
1336 {
1337 tty->print_cr("Relocating external roots ... ");
1338 ResourceMark rm;
1339 RefRelocator ext_reloc;
1340 iterate_roots(&ext_reloc);
1341 }
1342
1343#ifdef ASSERT
1344 {
1345 tty->print_cr("Verifying external roots ... ");
1346 ResourceMark rm;
1347 IsRefInArchiveChecker checker;
1348 iterate_roots(&checker);
1349 }
1350#endif
1351
1352
1353 // cleanup
1354 _ssc = NULL;
1355 }
1356
1357 // We must relocate the System::_well_known_klasses only after we have copied the
1358 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1359 // old objects which assert that their klass is the original klass.
1360 static void relocate_well_known_klasses() {
1361 {
1362 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
1363 ResourceMark rm;
1364 RefRelocator ext_reloc;
1365 SystemDictionary::well_known_klasses_do(&ext_reloc);
1366 }
1367 // NOTE: after this point, we shouldn't have any globals that can reach the old
1368 // objects.
1369
1370 // We cannot use any of the objects in the heap anymore (except for the
1371 // shared strings) because their headers no longer point to valid Klasses.
1372 }
1373
1374 static void iterate_roots(MetaspaceClosure* it) {
1375 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
1376 for (int i=0; i<symbols->length(); i++) {
1377 it->push(symbols->adr_at(i));
1378 }
1379 if (_global_klass_objects != NULL) {
1380 // Need to fix up the pointers
1381 for (int i = 0; i < _global_klass_objects->length(); i++) {
1382 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1383 it->push(_global_klass_objects->adr_at(i));
1384 }
1385 }
1386 FileMapInfo::metaspace_pointers_do(it);
1387 SystemDictionaryShared::dumptime_classes_do(it);
1388 Universe::metaspace_pointers_do(it);
1389 SymbolTable::metaspace_pointers_do(it);
1390 vmSymbols::metaspace_pointers_do(it);
1391
1392 it->finish();
1393 }
1394
1395 static Klass* get_relocated_klass(Klass* orig_klass) {
1396 assert(DumpSharedSpaces, "dump time only");
1397 address* pp = _new_loc_table->lookup((address)orig_klass);
1398 assert(pp != NULL, "must be");
1399 Klass* klass = (Klass*)(*pp);
1400 assert(klass->is_klass(), "must be");
1401 return klass;
1402 }
1403};
1404
1405DumpAllocStats* ArchiveCompactor::_alloc_stats;
1406SortedSymbolClosure* ArchiveCompactor::_ssc;
1407ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1408
1409void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
1410 DumpRegion* dump_region, bool read_only, bool allow_exec) {
1411 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1412}
1413
1414void VM_PopulateDumpSharedSpace::dump_symbols() {
1415 tty->print_cr("Dumping symbol table ...");
1416
1417 NOT_PRODUCT(SymbolTable::verify());
1418 SymbolTable::write_to_archive();
1419}
1420
1421char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1422 ArchiveCompactor::OtherROAllocMark mark;
1423
1424 tty->print("Removing java_mirror ... ");
1425 if (!HeapShared::is_heap_object_archiving_allowed()) {
1426 clear_basic_type_mirrors();
1427 }
1428 remove_java_mirror_in_classes();
1429 tty->print_cr("done. ");
1430
1431 SystemDictionaryShared::write_to_archive();
1432
1433 char* start = _ro_region.top();
1434
1435 size_t vtptrs_bytes = _num_cloned_vtable_kinds * sizeof(intptr_t*);
1436 _cloned_cpp_vtptrs = (intptr_t**)_ro_region.allocate(vtptrs_bytes, sizeof(intptr_t*));
1437
1438 // Write the other data to the output array.
1439 WriteClosure wc(&_ro_region);
1440 MetaspaceShared::serialize(&wc);
1441
1442 // Write the bitmaps for patching the archive heap regions
1443 dump_archive_heap_oopmaps();
1444
1445 return start;
1446}
1447
1448void VM_PopulateDumpSharedSpace::doit() {
1449 // We should no longer allocate anything from the metaspace, so that:
1450 //
1451 // (1) Metaspace::allocate might trigger GC if we have run out of
1452 // committed metaspace, but we can't GC because we're running
1453 // in the VM thread.
1454 // (2) ArchiveCompactor needs to work with a stable set of MetaspaceObjs.
1455 Metaspace::freeze();
1456 DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
1457
1458 Thread* THREAD = VMThread::vm_thread();
1459
1460 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1461
1462 NOT_PRODUCT(SystemDictionary::verify();)
1463 // The following guarantee is meant to ensure that no loader constraints
1464 // exist yet, since the constraints table is not shared. This becomes
1465 // more important now that we don't re-initialize vtables/itables for
1466 // shared classes at runtime, where constraints were previously created.
1467 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1468 "loader constraints are not saved");
1469 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1470 "placeholders are not saved");
1471
1472 // At this point, many classes have been loaded.
1473 // Gather systemDictionary classes in a global array and do everything to
1474 // that so we don't have to walk the SystemDictionary again.
1475 SystemDictionaryShared::check_excluded_classes();
1476 _global_klass_objects = new GrowableArray<Klass*>(1000);
1477 CollectClassesClosure collect_classes;
1478 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1479
1480 tty->print_cr("Number of classes %d", _global_klass_objects->length());
1481 {
1482 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1483 for (int i = 0; i < _global_klass_objects->length(); i++) {
1484 Klass* k = _global_klass_objects->at(i);
1485 if (k->is_instance_klass()) {
1486 num_inst ++;
1487 } else if (k->is_objArray_klass()) {
1488 num_obj_array ++;
1489 } else {
1490 assert(k->is_typeArray_klass(), "sanity");
1491 num_type_array ++;
1492 }
1493 }
1494 tty->print_cr(" instance classes = %5d", num_inst);
1495 tty->print_cr(" obj array classes = %5d", num_obj_array);
1496 tty->print_cr(" type array classes = %5d", num_type_array);
1497 }
1498
1499 // Ensure the ConstMethods won't be modified at run-time
1500 tty->print("Updating ConstMethods ... ");
1501 rewrite_nofast_bytecodes_and_calculate_fingerprints();
1502 tty->print_cr("done. ");
1503
1504 // Remove all references outside the metadata
1505 tty->print("Removing unshareable information ... ");
1506 remove_unshareable_in_classes();
1507 tty->print_cr("done. ");
1508
1509 ArchiveCompactor::initialize();
1510 ArchiveCompactor::copy_and_compact();
1511
1512 dump_symbols();
1513
1514 // Dump supported java heap objects
1515 _closed_archive_heap_regions = NULL;
1516 _open_archive_heap_regions = NULL;
1517 dump_java_heap_objects();
1518
1519 ArchiveCompactor::relocate_well_known_klasses();
1520
1521 char* read_only_tables_start = dump_read_only_tables();
1522 _ro_region.pack(&_md_region);
1523
1524 char* vtbl_list = _md_region.top();
1525 MetaspaceShared::allocate_cpp_vtable_clones();
1526 _md_region.pack();
1527
1528 // The 4 core spaces are allocated consecutively mc->rw->ro->md, so there total size
1529 // is just the spaces between the two ends.
1530 size_t core_spaces_size = _md_region.end() - _mc_region.base();
1531 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
1532 "should already be aligned");
1533
1534 // During patching, some virtual methods may be called, so at this point
1535 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
1536 MetaspaceShared::patch_cpp_vtable_pointers();
1537
1538 // The vtable clones contain addresses of the current process.
1539 // We don't want to write these addresses into the archive.
1540 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1541
1542 // Create and write the archive file that maps the shared spaces.
1543
1544 FileMapInfo* mapinfo = new FileMapInfo(true);
1545 mapinfo->populate_header(os::vm_allocation_granularity());
1546 mapinfo->set_read_only_tables_start(read_only_tables_start);
1547 mapinfo->set_misc_data_patching_start(vtbl_list);
1548 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
1549 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
1550 mapinfo->set_core_spaces_size(core_spaces_size);
1551
1552 for (int pass=1; pass<=2; pass++) {
1553 bool print_archive_log = (pass==1);
1554 if (pass == 1) {
1555 // The first pass doesn't actually write the data to disk. All it
1556 // does is to update the fields in the mapinfo->_header.
1557 } else {
1558 // After the first pass, the contents of mapinfo->_header are finalized,
1559 // so we can compute the header's CRC, and write the contents of the header
1560 // and the regions into disk.
1561 mapinfo->open_for_write();
1562 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1563 }
1564 mapinfo->write_header();
1565
1566 // NOTE: md contains the trampoline code for method entries, which are patched at run time,
1567 // so it needs to be read/write.
1568 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1569 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1570 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1571 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
1572
1573 _total_closed_archive_region_size = mapinfo->write_archive_heap_regions(
1574 _closed_archive_heap_regions,
1575 _closed_archive_heap_oopmaps,
1576 MetaspaceShared::first_closed_archive_heap_region,
1577 MetaspaceShared::max_closed_archive_heap_region,
1578 print_archive_log);
1579 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1580 _open_archive_heap_regions,
1581 _open_archive_heap_oopmaps,
1582 MetaspaceShared::first_open_archive_heap_region,
1583 MetaspaceShared::max_open_archive_heap_region,
1584 print_archive_log);
1585 }
1586
1587 mapinfo->close();
1588
1589 // Restore the vtable in case we invoke any virtual methods.
1590 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
1591
1592 print_region_stats();
1593
1594 if (log_is_enabled(Info, cds)) {
1595 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1596 int(_mc_region.used()), int(_md_region.used()));
1597 }
1598
1599 if (PrintSystemDictionaryAtExit) {
1600 SystemDictionary::print();
1601 }
1602
1603 if (AllowArchivingWithJavaAgent) {
1604 warning("This archive was created with AllowArchivingWithJavaAgent. It should be used "
1605 "for testing purposes only and should not be used in a production environment");
1606 }
1607
1608 // There may be other pending VM operations that operate on the InstanceKlasses,
1609 // which will fail because InstanceKlasses::remove_unshareable_info()
1610 // has been called. Forget these operations and exit the VM directly.
1611 vm_direct_exit(0);
1612}
1613
1614void VM_PopulateDumpSharedSpace::print_region_stats() {
1615 // Print statistics of all the regions
1616 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1617 _mc_region.reserved() + _md_region.reserved() +
1618 _total_closed_archive_region_size +
1619 _total_open_archive_region_size;
1620 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1621 _mc_region.used() + _md_region.used() +
1622 _total_closed_archive_region_size +
1623 _total_open_archive_region_size;
1624 const double total_u_perc = percent_of(total_bytes, total_reserved);
1625
1626 _mc_region.print(total_reserved);
1627 _rw_region.print(total_reserved);
1628 _ro_region.print(total_reserved);
1629 _md_region.print(total_reserved);
1630 print_heap_region_stats(_closed_archive_heap_regions, "ca", total_reserved);
1631 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1632
1633 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1634 total_bytes, total_reserved, total_u_perc);
1635}
1636
1637void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1638 const char *name, const size_t total_size) {
1639 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1640 for (int i = 0; i < arr_len; i++) {
1641 char* start = (char*)heap_mem->at(i).start();
1642 size_t size = heap_mem->at(i).byte_size();
1643 char* top = start + size;
1644 tty->print_cr("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used] at " INTPTR_FORMAT,
1645 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1646
1647 }
1648}
1649
1650// Update a Java object to point its Klass* to the new location after
1651// shared archive has been compacted.
1652void MetaspaceShared::relocate_klass_ptr(oop o) {
1653 assert(DumpSharedSpaces, "sanity");
1654 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1655 o->set_klass(k);
1656}
1657
1658Klass* MetaspaceShared::get_relocated_klass(Klass *k) {
1659 assert(DumpSharedSpaces, "sanity");
1660 return ArchiveCompactor::get_relocated_klass(k);
1661}
1662
1663class LinkSharedClassesClosure : public KlassClosure {
1664 Thread* THREAD;
1665 bool _made_progress;
1666 public:
1667 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1668
1669 void reset() { _made_progress = false; }
1670 bool made_progress() const { return _made_progress; }
1671
1672 void do_klass(Klass* k) {
1673 if (k->is_instance_klass()) {
1674 InstanceKlass* ik = InstanceKlass::cast(k);
1675 // Link the class to cause the bytecodes to be rewritten and the
1676 // cpcache to be created. Class verification is done according
1677 // to -Xverify setting.
1678 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1679 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1680
1681 ik->constants()->resolve_class_constants(THREAD);
1682 }
1683 }
1684};
1685
1686class CheckSharedClassesClosure : public KlassClosure {
1687 bool _made_progress;
1688 public:
1689 CheckSharedClassesClosure() : _made_progress(false) {}
1690
1691 void reset() { _made_progress = false; }
1692 bool made_progress() const { return _made_progress; }
1693 void do_klass(Klass* k) {
1694 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
1695 _made_progress = true;
1696 }
1697 }
1698};
1699
1700void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1701 // We need to iterate because verification may cause additional classes
1702 // to be loaded.
1703 LinkSharedClassesClosure link_closure(THREAD);
1704 do {
1705 link_closure.reset();
1706 ClassLoaderDataGraph::unlocked_loaded_classes_do(&link_closure);
1707 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1708 } while (link_closure.made_progress());
1709
1710 if (_has_error_classes) {
1711 // Mark all classes whose super class or interfaces failed verification.
1712 CheckSharedClassesClosure check_closure;
1713 do {
1714 // Not completely sure if we need to do this iteratively. Anyway,
1715 // we should come here only if there are unverifiable classes, which
1716 // shouldn't happen in normal cases. So better safe than sorry.
1717 check_closure.reset();
1718 ClassLoaderDataGraph::unlocked_loaded_classes_do(&check_closure);
1719 } while (check_closure.made_progress());
1720 }
1721}
1722
1723void MetaspaceShared::prepare_for_dumping() {
1724 Arguments::check_unsupported_dumping_properties();
1725 ClassLoader::initialize_shared_path();
1726}
1727
1728// Preload classes from a list, populate the shared spaces and dump to a
1729// file.
1730void MetaspaceShared::preload_and_dump(TRAPS) {
1731 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1732 ResourceMark rm;
1733 char class_list_path_str[JVM_MAXPATHLEN];
1734 // Preload classes to be shared.
1735 const char* class_list_path;
1736 if (SharedClassListFile == NULL) {
1737 // Construct the path to the class list (in jre/lib)
1738 // Walk up two directories from the location of the VM and
1739 // optionally tack on "lib" (depending on platform)
1740 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1741 for (int i = 0; i < 3; i++) {
1742 char *end = strrchr(class_list_path_str, *os::file_separator());
1743 if (end != NULL) *end = '\0';
1744 }
1745 int class_list_path_len = (int)strlen(class_list_path_str);
1746 if (class_list_path_len >= 3) {
1747 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1748 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1749 jio_snprintf(class_list_path_str + class_list_path_len,
1750 sizeof(class_list_path_str) - class_list_path_len,
1751 "%slib", os::file_separator());
1752 class_list_path_len += 4;
1753 }
1754 }
1755 }
1756 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1757 jio_snprintf(class_list_path_str + class_list_path_len,
1758 sizeof(class_list_path_str) - class_list_path_len,
1759 "%sclasslist", os::file_separator());
1760 }
1761 class_list_path = class_list_path_str;
1762 } else {
1763 class_list_path = SharedClassListFile;
1764 }
1765
1766 tty->print_cr("Loading classes to share ...");
1767 _has_error_classes = false;
1768 int class_count = preload_classes(class_list_path, THREAD);
1769 if (ExtraSharedClassListFile) {
1770 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1771 }
1772 tty->print_cr("Loading classes to share: done.");
1773
1774 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1775
1776 if (SharedArchiveConfigFile) {
1777 tty->print_cr("Reading extra data from %s ...", SharedArchiveConfigFile);
1778 read_extra_data(SharedArchiveConfigFile, THREAD);
1779 }
1780 tty->print_cr("Reading extra data: done.");
1781
1782 HeapShared::init_subgraph_entry_fields(THREAD);
1783
1784 // Rewrite and link classes
1785 tty->print_cr("Rewriting and linking classes ...");
1786
1787 // Link any classes which got missed. This would happen if we have loaded classes that
1788 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1789 // fails verification, all other interfaces that were not specified in the classlist but
1790 // are implemented by K are not verified.
1791 link_and_cleanup_shared_classes(CATCH);
1792 tty->print_cr("Rewriting and linking classes: done");
1793
1794 if (HeapShared::is_heap_object_archiving_allowed()) {
1795 // Avoid fragmentation while archiving heap objects.
1796 Universe::heap()->soft_ref_policy()->set_should_clear_all_soft_refs(true);
1797 Universe::heap()->collect(GCCause::_archive_time_gc);
1798 Universe::heap()->soft_ref_policy()->set_should_clear_all_soft_refs(false);
1799 }
1800
1801 VM_PopulateDumpSharedSpace op;
1802 VMThread::execute(&op);
1803 }
1804}
1805
1806
1807int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1808 ClassListParser parser(class_list_path);
1809 int class_count = 0;
1810
1811 while (parser.parse_one_line()) {
1812 Klass* klass = parser.load_current_class(THREAD);
1813 if (HAS_PENDING_EXCEPTION) {
1814 if (klass == NULL &&
1815 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1816 // print a warning only when the pending exception is class not found
1817 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
1818 }
1819 CLEAR_PENDING_EXCEPTION;
1820 }
1821 if (klass != NULL) {
1822 if (log_is_enabled(Trace, cds)) {
1823 ResourceMark rm;
1824 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
1825 }
1826
1827 if (klass->is_instance_klass()) {
1828 InstanceKlass* ik = InstanceKlass::cast(klass);
1829
1830 // Link the class to cause the bytecodes to be rewritten and the
1831 // cpcache to be created. The linking is done as soon as classes
1832 // are loaded in order that the related data structures (klass and
1833 // cpCache) are located together.
1834 try_link_class(ik, THREAD);
1835 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1836 }
1837
1838 class_count++;
1839 }
1840 }
1841
1842 return class_count;
1843}
1844
1845// Returns true if the class's status has changed
1846bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
1847 assert(DumpSharedSpaces, "should only be called during dumping");
1848 if (ik->init_state() < InstanceKlass::linked) {
1849 bool saved = BytecodeVerificationLocal;
1850 if (ik->loader_type() == 0 && ik->class_loader() == NULL) {
1851 // The verification decision is based on BytecodeVerificationRemote
1852 // for non-system classes. Since we are using the NULL classloader
1853 // to load non-system classes for customized class loaders during dumping,
1854 // we need to temporarily change BytecodeVerificationLocal to be the same as
1855 // BytecodeVerificationRemote. Note this can cause the parent system
1856 // classes also being verified. The extra overhead is acceptable during
1857 // dumping.
1858 BytecodeVerificationLocal = BytecodeVerificationRemote;
1859 }
1860 ik->link_class(THREAD);
1861 if (HAS_PENDING_EXCEPTION) {
1862 ResourceMark rm;
1863 tty->print_cr("Preload Warning: Verification failed for %s",
1864 ik->external_name());
1865 CLEAR_PENDING_EXCEPTION;
1866 ik->set_in_error_state();
1867 _has_error_classes = true;
1868 }
1869 BytecodeVerificationLocal = saved;
1870 return true;
1871 } else {
1872 return false;
1873 }
1874}
1875
1876#if INCLUDE_CDS_JAVA_HEAP
1877void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1878 // The closed and open archive heap space has maximum two regions.
1879 // See FileMapInfo::write_archive_heap_regions() for details.
1880 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
1881 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
1882 HeapShared::archive_java_heap_objects(_closed_archive_heap_regions,
1883 _open_archive_heap_regions);
1884 ArchiveCompactor::OtherROAllocMark mark;
1885 HeapShared::write_subgraph_info_table();
1886}
1887
1888void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
1889 if (HeapShared::is_heap_object_archiving_allowed()) {
1890 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1891 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
1892
1893 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1894 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
1895 }
1896}
1897
1898void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1899 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
1900 for (int i=0; i<regions->length(); i++) {
1901 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
1902 size_t size_in_bits = oopmap.size();
1903 size_t size_in_bytes = oopmap.size_in_bytes();
1904 uintptr_t* buffer = (uintptr_t*)_ro_region.allocate(size_in_bytes, sizeof(intptr_t));
1905 oopmap.write_to(buffer, size_in_bytes);
1906 log_info(cds)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region "
1907 INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)",
1908 p2i(buffer), size_in_bytes,
1909 p2i(regions->at(i).start()), regions->at(i).byte_size());
1910
1911 ArchiveHeapOopmapInfo info;
1912 info._oopmap = (address)buffer;
1913 info._oopmap_size_in_bits = size_in_bits;
1914 oopmaps->append(info);
1915 }
1916}
1917#endif // INCLUDE_CDS_JAVA_HEAP
1918
1919void ReadClosure::do_ptr(void** p) {
1920 assert(*p == NULL, "initializing previous initialized pointer.");
1921 intptr_t obj = nextPtr();
1922 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1923 "hit tag while initializing ptrs.");
1924 *p = (void*)obj;
1925}
1926
1927void ReadClosure::do_u4(u4* p) {
1928 intptr_t obj = nextPtr();
1929 *p = (u4)(uintx(obj));
1930}
1931
1932void ReadClosure::do_bool(bool* p) {
1933 intptr_t obj = nextPtr();
1934 *p = (bool)(uintx(obj));
1935}
1936
1937void ReadClosure::do_tag(int tag) {
1938 int old_tag;
1939 old_tag = (int)(intptr_t)nextPtr();
1940 // do_int(&old_tag);
1941 assert(tag == old_tag, "old tag doesn't match");
1942 FileMapInfo::assert_mark(tag == old_tag);
1943}
1944
1945void ReadClosure::do_oop(oop *p) {
1946 narrowOop o = (narrowOop)nextPtr();
1947 if (o == 0 || !HeapShared::open_archive_heap_region_mapped()) {
1948 p = NULL;
1949 } else {
1950 assert(HeapShared::is_heap_object_archiving_allowed(),
1951 "Archived heap object is not allowed");
1952 assert(HeapShared::open_archive_heap_region_mapped(),
1953 "Open archive heap region is not mapped");
1954 *p = HeapShared::decode_from_archive(o);
1955 }
1956}
1957
1958void ReadClosure::do_region(u_char* start, size_t size) {
1959 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1960 assert(size % sizeof(intptr_t) == 0, "bad size");
1961 do_tag((int)size);
1962 while (size > 0) {
1963 *(intptr_t*)start = nextPtr();
1964 start += sizeof(intptr_t);
1965 size -= sizeof(intptr_t);
1966 }
1967}
1968
1969void MetaspaceShared::set_shared_metaspace_range(void* base, void* top) {
1970 _shared_metaspace_static_top = top;
1971 MetaspaceObj::set_shared_metaspace_range(base, top);
1972}
1973
1974// Return true if given address is in the misc data region
1975bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
1976 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
1977}
1978
1979bool MetaspaceShared::is_in_trampoline_frame(address addr) {
1980 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
1981 return true;
1982 }
1983 return false;
1984}
1985
1986bool MetaspaceShared::is_shared_dynamic(void* p) {
1987 if ((p < MetaspaceObj::shared_metaspace_top()) &&
1988 (p >= _shared_metaspace_static_top)) {
1989 return true;
1990 } else {
1991 return false;
1992 }
1993}
1994
1995// Map shared spaces at requested addresses and return if succeeded.
1996bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1997 size_t image_alignment = mapinfo->alignment();
1998
1999#ifndef _WINDOWS
2000 // Map in the shared memory and then map the regions on top of it.
2001 // On Windows, don't map the memory here because it will cause the
2002 // mappings of the regions to fail.
2003 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
2004 if (!shared_rs.is_reserved()) return false;
2005#endif
2006
2007 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
2008
2009 // Map each shared region
2010 int regions[] = {mc, rw, ro, md};
2011 size_t len = sizeof(regions)/sizeof(int);
2012 char* saved_base[] = {NULL, NULL, NULL, NULL};
2013 char* top = mapinfo->map_regions(regions, saved_base, len );
2014
2015 if (top != NULL &&
2016 (image_alignment == (size_t)os::vm_allocation_granularity()) &&
2017 mapinfo->validate_shared_path_table()) {
2018 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for
2019 // fast checking in MetaspaceShared::is_in_shared_metaspace() and
2020 // MetaspaceObj::is_shared().
2021 _core_spaces_size = mapinfo->core_spaces_size();
2022 set_shared_metaspace_range((void*)saved_base[0], (void*)top);
2023 return true;
2024 } else {
2025 mapinfo->unmap_regions(regions, saved_base, len);
2026#ifndef _WINDOWS
2027 // Release the entire mapped region
2028 shared_rs.release();
2029#endif
2030 // If -Xshare:on is specified, print out the error message and exit VM,
2031 // otherwise, set UseSharedSpaces to false and continue.
2032 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
2033 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
2034 } else {
2035 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2036 }
2037 return false;
2038 }
2039}
2040
2041// Read the miscellaneous data from the shared file, and
2042// serialize it out to its various destinations.
2043
2044void MetaspaceShared::initialize_shared_spaces() {
2045 FileMapInfo *mapinfo = FileMapInfo::current_info();
2046 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
2047 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
2048 // _core_spaces_size is loaded from the shared archive immediatelly after mapping
2049 assert(_core_spaces_size == mapinfo->core_spaces_size(), "sanity");
2050 char* buffer = mapinfo->misc_data_patching_start();
2051 clone_cpp_vtables((intptr_t*)buffer);
2052
2053 // The rest of the data is now stored in the RW region
2054 buffer = mapinfo->read_only_tables_start();
2055
2056 // Skip over _cloned_cpp_vtptrs;
2057 buffer += _num_cloned_vtable_kinds * sizeof(intptr_t*);
2058
2059 // Verify various attributes of the archive, plus initialize the
2060 // shared string/symbol tables
2061 intptr_t* array = (intptr_t*)buffer;
2062 ReadClosure rc(&array);
2063 serialize(&rc);
2064
2065 // Initialize the run-time symbol table.
2066 SymbolTable::create_table();
2067
2068 mapinfo->patch_archived_heap_embedded_pointers();
2069
2070 // Close the mapinfo file
2071 mapinfo->close();
2072
2073 if (PrintSharedArchiveAndExit) {
2074 if (PrintSharedDictionary) {
2075 tty->print_cr("\nShared classes:\n");
2076 SystemDictionaryShared::print_on(tty);
2077 }
2078 if (_archive_loading_failed) {
2079 tty->print_cr("archive is invalid");
2080 vm_exit(1);
2081 } else {
2082 tty->print_cr("archive is valid");
2083 vm_exit(0);
2084 }
2085 }
2086}
2087
2088// JVM/TI RedefineClasses() support:
2089bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2090 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2091
2092 if (UseSharedSpaces) {
2093 // remap the shared readonly space to shared readwrite, private
2094 FileMapInfo* mapinfo = FileMapInfo::current_info();
2095 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2096 return false;
2097 }
2098 if (FileMapInfo::dynamic_info() != NULL) {
2099 mapinfo = FileMapInfo::dynamic_info();
2100 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2101 return false;
2102 }
2103 }
2104 _remapped_readwrite = true;
2105 }
2106 return true;
2107}
2108
2109void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2110 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2111 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2112 // or so.
2113 _mc_region.print_out_of_space_msg(name, needed_bytes);
2114 _rw_region.print_out_of_space_msg(name, needed_bytes);
2115 _ro_region.print_out_of_space_msg(name, needed_bytes);
2116 _md_region.print_out_of_space_msg(name, needed_bytes);
2117
2118 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2119 "Please reduce the number of shared classes.");
2120}
2121