1 /*
2 * Copyright (c) 2012, 2018, 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/classListParser.hpp"
28 #include "classfile/classLoaderExt.hpp"
29 #include "classfile/dictionary.hpp"
30 #include "classfile/loaderConstraints.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/filemap.hpp"
42 #include "memory/heapShared.hpp"
43 #include "memory/metaspace.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/metaspaceShared.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "oops/compressedOops.inline.hpp"
48 #include "oops/instanceClassLoaderKlass.hpp"
49 #include "oops/instanceMirrorKlass.hpp"
50 #include "oops/instanceRefKlass.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/objArrayOop.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/typeArrayKlass.hpp"
55 #include "prims/jvmtiRedefineClasses.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/signature.hpp"
60 #include "runtime/timerTrace.hpp"
61 #include "runtime/vmThread.hpp"
62 #include "runtime/vm_operations.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/hashtable.inline.hpp"
66 #if INCLUDE_G1GC
67 #include "gc/g1/g1Allocator.inline.hpp"
68 #include "gc/g1/g1CollectedHeap.hpp"
69 #endif
70
71 ReservedSpace MetaspaceShared::_shared_rs;
72 VirtualSpace MetaspaceShared::_shared_vs;
73 MetaspaceSharedStats MetaspaceShared::_stats;
74 bool MetaspaceShared::_has_error_classes;
75 bool MetaspaceShared::_archive_loading_failed = false;
76 bool MetaspaceShared::_remapped_readwrite = false;
77 bool MetaspaceShared::_open_archive_heap_region_mapped = false;
78 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
79 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
80 size_t MetaspaceShared::_core_spaces_size = 0;
81
82 // The CDS archive is divided into the following regions:
83 // mc - misc code (the method entry trampolines)
84 // rw - read-write metadata
85 // ro - read-only metadata and read-only tables
86 // md - misc data (the c++ vtables)
87 // od - optional data (original class files)
88 //
89 // s0 - shared strings(closed archive heap space) #0
90 // s1 - shared strings(closed archive heap space) #1 (may be empty)
91 // oa0 - open archive heap space #0
92 // oa1 - open archive heap space #1 (may be empty)
93 //
94 // The mc, rw, ro, md and od regions are linearly allocated, starting from
95 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions
96 // are page-aligned, and there's no gap between any consecutive regions.
97 //
98 // These 5 regions are populated in the following steps:
99 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
100 // temporarily allocated outside of the shared regions. Only the method entry
101 // trampolines are written into the mc region.
102 // [2] ArchiveCompactor copies RW metadata into the rw region.
103 // [3] ArchiveCompactor copies RO metadata into the ro region.
104 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
105 // are copied into the ro region as read-only tables.
106 // [5] C++ vtables are copied into the md region.
107 // [6] Original class files are copied into the od region.
108 //
109 // The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects.
110 // Their layout is independent of the other 5 regions.
111
112 class DumpRegion {
113 private:
114 const char* _name;
115 char* _base;
116 char* _top;
117 char* _end;
118 bool _is_packed;
119
120 char* expand_top_to(char* newtop) {
121 assert(is_allocatable(), "must be initialized and not packed");
122 assert(newtop >= _top, "must not grow backwards");
123 if (newtop > _end) {
124 MetaspaceShared::report_out_of_space(_name, newtop - _top);
125 ShouldNotReachHere();
126 }
127 MetaspaceShared::commit_shared_space_to(newtop);
128 _top = newtop;
129 return _top;
130 }
131
132 public:
133 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {}
134
135 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) {
136 char* p = (char*)align_up(_top, alignment);
137 char* newtop = p + align_up(num_bytes, alignment);
138 expand_top_to(newtop);
139 memset(p, 0, newtop - p);
140 return p;
141 }
142
143 void append_intptr_t(intptr_t n) {
144 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
145 intptr_t *p = (intptr_t*)_top;
146 char* newtop = _top + sizeof(intptr_t);
147 expand_top_to(newtop);
148 *p = n;
149 }
150
151 char* base() const { return _base; }
152 char* top() const { return _top; }
153 char* end() const { return _end; }
154 size_t reserved() const { return _end - _base; }
155 size_t used() const { return _top - _base; }
156 bool is_packed() const { return _is_packed; }
157 bool is_allocatable() const {
158 return !is_packed() && _base != NULL;
159 }
160
161 void print(size_t total_bytes) const {
162 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,
163 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()), p2i(_base));
164 }
165 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
166 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
167 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
168 if (strcmp(_name, failing_region) == 0) {
169 tty->print_cr(" required = %d", int(needed_bytes));
170 } else {
171 tty->cr();
172 }
173 }
174
175 void init(const ReservedSpace* rs) {
176 _base = _top = rs->base();
177 _end = rs->end();
178 }
179 void init(char* b, char* t, char* e) {
180 _base = b;
181 _top = t;
182 _end = e;
183 }
184
185 void pack(DumpRegion* next = NULL) {
186 assert(!is_packed(), "sanity");
187 _end = (char*)align_up(_top, Metaspace::reserve_alignment());
188 _is_packed = true;
189 if (next != NULL) {
190 next->_base = next->_top = this->_end;
191 next->_end = MetaspaceShared::shared_rs()->end();
192 }
193 }
194 bool contains(char* p) {
195 return base() <= p && p < top();
196 }
197 };
198
199
200 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od");
201 size_t _total_string_region_size = 0, _total_open_archive_region_size = 0;
202
203 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
204 return _mc_region.allocate(num_bytes);
205 }
206
207 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
208 return _ro_region.allocate(num_bytes);
209 }
210
211 char* MetaspaceShared::read_only_space_top() {
212 return _ro_region.top();
213 }
214
215 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
216 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
217
218 // If using shared space, open the file that contains the shared space
219 // and map in the memory before initializing the rest of metaspace (so
220 // the addresses don't conflict)
221 address cds_address = NULL;
222 FileMapInfo* mapinfo = new FileMapInfo();
223
224 // Open the shared archive file, read and validate the header. If
225 // initialization fails, shared spaces [UseSharedSpaces] are
226 // disabled and the file is closed.
227 // Map in spaces now also
228 if (mapinfo->initialize() && map_shared_spaces(mapinfo)) {
229 size_t cds_total = core_spaces_size();
230 cds_address = (address)mapinfo->header()->region_addr(0);
231 #ifdef _LP64
232 if (Metaspace::using_class_space()) {
233 char* cds_end = (char*)(cds_address + cds_total);
234 cds_end = (char *)align_up(cds_end, Metaspace::reserve_alignment());
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 Universe::set_narrow_klass_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
250 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() {
251 assert(DumpSharedSpaces, "should be called for dump time only");
252 const size_t reserve_alignment = Metaspace::reserve_alignment();
253 bool large_pages = false; // No large pages when dumping the CDS archive.
254 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment);
255
256 #ifdef _LP64
257 // On 64-bit VM, the heap and class space layout will be the same as if
258 // you're running in -Xshare:on mode:
259 //
260 // +-- SharedBaseAddress (default = 0x800000000)
261 // v
262 // +-..---------+---------+ ... +----+----+----+----+----+---------------+
263 // | Heap | Archive | | MC | RW | RO | MD | OD | class space |
264 // +-..---------+---------+ ... +----+----+----+----+----+---------------+
265 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB ------->|
266 //
267 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
268 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
269 #else
270 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space.
271 size_t cds_total = align_down(256*M, reserve_alignment);
272 #endif
273
274 // First try to reserve the space at the specified SharedBaseAddress.
275 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base);
276 if (_shared_rs.is_reserved()) {
277 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match");
278 } else {
279 // Get a mmap region anywhere if the SharedBaseAddress fails.
280 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages);
281 }
282 if (!_shared_rs.is_reserved()) {
283 vm_exit_during_initialization("Unable to reserve memory for shared space",
284 err_msg(SIZE_FORMAT " bytes.", cds_total));
285 }
286
287 #ifdef _LP64
288 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up:
289 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes()
290 // will store Klasses into this space.
291 // + The lower 3 GB is used for the archive -- when preload_classes() is done,
292 // ArchiveCompactor will copy the class metadata into this space, first the RW parts,
293 // then the RO parts.
294
295 assert(UseCompressedOops && UseCompressedClassPointers,
296 "UseCompressedOops and UseCompressedClassPointers must be set");
297
298 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment);
299 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size);
300 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment);
301 _shared_rs = _shared_rs.first_part(max_archive_size);
302
303 // Set up compress class pointers.
304 Universe::set_narrow_klass_base((address)_shared_rs.base());
305 // Set narrow_klass_shift to be LogKlassAlignmentInBytes. This is consistent
306 // with AOT.
307 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
308 // Set the range of klass addresses to 4GB.
309 Universe::set_narrow_klass_range(cds_total);
310
311 Metaspace::initialize_class_space(tmp_class_space);
312 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
313 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
314
315 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
316 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
317 #endif
318
319 // Start with 0 committed bytes. The memory will be committed as needed by
320 // MetaspaceShared::commit_shared_space_to().
321 if (!_shared_vs.initialize(_shared_rs, 0)) {
322 vm_exit_during_initialization("Unable to allocate memory for shared space");
323 }
324
325 _mc_region.init(&_shared_rs);
326 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
327 _shared_rs.size(), p2i(_shared_rs.base()));
328 }
329
330 // Called by universe_post_init()
331 void MetaspaceShared::post_initialize(TRAPS) {
332 if (UseSharedSpaces) {
333 int size = FileMapInfo::get_number_of_shared_paths();
334 if (size > 0) {
335 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD);
336 FileMapInfo::FileMapHeader* header = FileMapInfo::current_info()->header();
337 ClassLoaderExt::init_paths_start_index(header->_app_class_paths_start_index);
338 ClassLoaderExt::init_app_module_paths_start_index(header->_app_module_paths_start_index);
339 }
340 }
341
342 if (DumpSharedSpaces) {
343 if (SharedArchiveConfigFile) {
344 read_extra_data(SharedArchiveConfigFile, THREAD);
345 }
346 }
347 }
348
349 void MetaspaceShared::read_extra_data(const char* filename, TRAPS) {
350 HashtableTextDump reader(filename);
351 reader.check_version("VERSION: 1.0");
352
353 while (reader.remain() > 0) {
354 int utf8_length;
355 int prefix_type = reader.scan_prefix(&utf8_length);
356 ResourceMark rm(THREAD);
357 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, utf8_length);
358 reader.get_utf8(utf8_buffer, utf8_length);
359
360 if (prefix_type == HashtableTextDump::SymbolPrefix) {
361 SymbolTable::new_symbol(utf8_buffer, utf8_length, THREAD);
362 } else{
363 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
364 utf8_buffer[utf8_length] = '\0';
365 oop s = StringTable::intern(utf8_buffer, THREAD);
366 }
367 }
368 }
369
370 void MetaspaceShared::commit_shared_space_to(char* newtop) {
371 assert(DumpSharedSpaces, "dump-time only");
372 char* base = _shared_rs.base();
373 size_t need_committed_size = newtop - base;
374 size_t has_committed_size = _shared_vs.committed_size();
375 if (need_committed_size < has_committed_size) {
376 return;
377 }
378
379 size_t min_bytes = need_committed_size - has_committed_size;
380 size_t preferred_bytes = 1 * M;
381 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size;
382
383 size_t commit = MAX2(min_bytes, preferred_bytes);
384 assert(commit <= uncommitted, "sanity");
385
386 bool result = _shared_vs.expand_by(commit, false);
387 if (!result) {
388 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
389 need_committed_size));
390 }
391
392 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
393 commit, _shared_vs.actual_committed_size(), _shared_vs.high());
394 }
395
396 // Read/write a data stream for restoring/preserving metadata pointers and
397 // miscellaneous data from/to the shared archive file.
398
399 void MetaspaceShared::serialize(SerializeClosure* soc) {
400 int tag = 0;
401 soc->do_tag(--tag);
402
403 // Verify the sizes of various metadata in the system.
404 soc->do_tag(sizeof(Method));
405 soc->do_tag(sizeof(ConstMethod));
406 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
407 soc->do_tag(sizeof(ConstantPool));
408 soc->do_tag(sizeof(ConstantPoolCache));
409 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
410 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
411 soc->do_tag(sizeof(Symbol));
412
413 // Dump/restore miscellaneous metadata.
414 Universe::serialize(soc, true);
415 soc->do_tag(--tag);
416
417 // Dump/restore references to commonly used names and signatures.
418 vmSymbols::serialize(soc);
419 soc->do_tag(--tag);
420
421 // Dump/restore the symbol and string tables
422 SymbolTable::serialize(soc);
423 StringTable::serialize(soc);
424 soc->do_tag(--tag);
425
426 serialize_well_known_classes(soc);
427 soc->do_tag(--tag);
428
429 soc->do_tag(666);
430 }
431
432 void MetaspaceShared::serialize_well_known_classes(SerializeClosure* soc) {
433 java_lang_Class::serialize(soc);
434 java_lang_String::serialize(soc);
435 java_lang_System::serialize(soc);
436 java_lang_ClassLoader::serialize(soc);
437 java_lang_Throwable::serialize(soc);
438 java_lang_Thread::serialize(soc);
439 java_lang_ThreadGroup::serialize(soc);
440 java_lang_AssertionStatusDirectives::serialize(soc);
441 java_lang_module_Configuration::serialize(soc);
442 java_lang_ref_SoftReference::serialize(soc);
443 java_lang_invoke_MethodHandle::serialize(soc);
444 java_lang_invoke_DirectMethodHandle::serialize(soc);
445 java_lang_invoke_MemberName::serialize(soc);
446 java_lang_invoke_ResolvedMethodName::serialize(soc);
447 java_lang_invoke_LambdaForm::serialize(soc);
448 java_lang_invoke_MethodType::serialize(soc);
449 java_lang_invoke_CallSite::serialize(soc);
450 java_lang_invoke_MethodHandleNatives_CallSiteContext::serialize(soc);
451 java_security_AccessControlContext::serialize(soc);
452 java_lang_reflect_AccessibleObject::serialize(soc);
453 java_lang_reflect_Method::serialize(soc);
454 java_lang_reflect_Constructor::serialize(soc);
455 java_lang_reflect_Field::serialize(soc);
456 java_nio_Buffer::serialize(soc);
457 reflect_ConstantPool::serialize(soc);
458 reflect_UnsafeStaticFieldAccessorImpl::serialize(soc);
459 java_lang_reflect_Parameter::serialize(soc);
460 java_lang_Module::serialize(soc);
461 java_lang_StackTraceElement::serialize(soc);
462 java_lang_StackFrameInfo::serialize(soc);
463 java_lang_LiveStackFrameInfo::serialize(soc);
464 java_util_concurrent_locks_AbstractOwnableSynchronizer::serialize(soc);
465 java_util_ImmutableCollections_ListN::serialize(soc);
466 java_util_ImmutableCollections_MapN::serialize(soc);
467 java_util_ImmutableCollections_SetN::serialize(soc);
468 jdk_internal_module_ArchivedModuleGraph::serialize(soc);
469 }
470
471 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
472 if (DumpSharedSpaces) {
473 if (_cds_i2i_entry_code_buffers == NULL) {
474 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
475 _cds_i2i_entry_code_buffers_size = total_size;
476 }
477 } else if (UseSharedSpaces) {
478 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
479 } else {
480 return NULL;
481 }
482
483 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
484 return _cds_i2i_entry_code_buffers;
485 }
486
487 // CDS code for dumping shared archive.
488
489 // Global object for holding classes that have been loaded. Since this
490 // is run at a safepoint just before exit, this is the entire set of classes.
491 static GrowableArray<Klass*>* _global_klass_objects;
492
493 static void collect_array_classes(Klass* k) {
494 _global_klass_objects->append_if_missing(k);
495 if (k->is_array_klass()) {
496 // Add in the array classes too
497 ArrayKlass* ak = ArrayKlass::cast(k);
498 Klass* h = ak->higher_dimension();
499 if (h != NULL) {
500 h->array_klasses_do(collect_array_classes);
501 }
502 }
503 }
504
505 class CollectClassesClosure : public KlassClosure {
506 void do_klass(Klass* k) {
507 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) {
508 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) {
509 // Mark any class with signers and don't add to the _global_klass_objects
510 k->set_has_signer_and_not_archived();
511 } else {
512 _global_klass_objects->append_if_missing(k);
513 }
514 }
515 if (k->is_array_klass()) {
516 // Add in the array classes too
517 ArrayKlass* ak = ArrayKlass::cast(k);
518 Klass* h = ak->higher_dimension();
519 if (h != NULL) {
520 h->array_klasses_do(collect_array_classes);
521 }
522 }
523 }
524 };
525
526 static void remove_unshareable_in_classes() {
527 for (int i = 0; i < _global_klass_objects->length(); i++) {
528 Klass* k = _global_klass_objects->at(i);
529 if (!k->is_objArray_klass()) {
530 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
531 // on their array classes.
532 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
533 k->remove_unshareable_info();
534 }
535 }
536 }
537
538 static void remove_java_mirror_in_classes() {
539 for (int i = 0; i < _global_klass_objects->length(); i++) {
540 Klass* k = _global_klass_objects->at(i);
541 if (!k->is_objArray_klass()) {
542 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
543 // on their array classes.
544 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
545 k->remove_java_mirror();
546 }
547 }
548 }
549
550 static void clear_basic_type_mirrors() {
551 assert(!MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
552 Universe::set_int_mirror(NULL);
553 Universe::set_float_mirror(NULL);
554 Universe::set_double_mirror(NULL);
555 Universe::set_byte_mirror(NULL);
556 Universe::set_bool_mirror(NULL);
557 Universe::set_char_mirror(NULL);
558 Universe::set_long_mirror(NULL);
559 Universe::set_short_mirror(NULL);
560 Universe::set_void_mirror(NULL);
561 }
562
563 static void rewrite_nofast_bytecode(Method* method) {
564 BytecodeStream bcs(method);
565 while (!bcs.is_last_bytecode()) {
566 Bytecodes::Code opcode = bcs.next();
567 switch (opcode) {
568 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
569 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
570 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
571 case Bytecodes::_iload: {
572 if (!bcs.is_wide()) {
573 *bcs.bcp() = Bytecodes::_nofast_iload;
574 }
575 break;
576 }
577 default: break;
578 }
579 }
580 }
581
582 // Walk all methods in the class list to ensure that they won't be modified at
583 // run time. This includes:
584 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
585 // at run time by RewriteBytecodes/RewriteFrequentPairs
586 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
587 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
588 for (int i = 0; i < _global_klass_objects->length(); i++) {
589 Klass* k = _global_klass_objects->at(i);
590 if (k->is_instance_klass()) {
591 InstanceKlass* ik = InstanceKlass::cast(k);
592 for (int i = 0; i < ik->methods()->length(); i++) {
593 Method* m = ik->methods()->at(i);
594 rewrite_nofast_bytecode(m);
595 Fingerprinter fp(m);
596 // The side effect of this call sets method's fingerprint field.
597 fp.fingerprint();
598 }
599 }
600 }
601 }
602
603 static void relocate_cached_class_file() {
604 for (int i = 0; i < _global_klass_objects->length(); i++) {
605 Klass* k = _global_klass_objects->at(i);
606 if (k->is_instance_klass()) {
607 InstanceKlass* ik = InstanceKlass::cast(k);
608 JvmtiCachedClassFileData* p = ik->get_archived_class_data();
609 if (p != NULL) {
610 int size = offset_of(JvmtiCachedClassFileData, data) + p->length;
611 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size);
612 q->length = p->length;
613 memcpy(q->data, p->data, p->length);
614 ik->set_archived_class_data(q);
615 }
616 }
617 }
618 }
619
620 NOT_PRODUCT(
621 static void assert_not_anonymous_class(InstanceKlass* k) {
622 assert(!(k->is_anonymous()), "cannot archive anonymous classes");
623 }
624
625 // Anonymous classes are not stored inside any dictionaries. They are created by
626 // SystemDictionary::parse_stream() with a non-null host_klass.
627 static void assert_no_anonymoys_classes_in_dictionaries() {
628 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class);
629 })
630
631 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
632 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
633 //
634 // Addresses of the vtables and the methods may be different across JVM runs,
635 // if libjvm.so is dynamically loaded at a different base address.
636 //
637 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
638 //
639 // + at dump time: we redirect the _vptr to point to our own vtables inside
640 // the CDS image
641 // + at run time: we clone the actual contents of the vtables from libjvm.so
642 // into our own tables.
643
644 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
645 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
646 f(ConstantPool) \
647 f(InstanceKlass) \
648 f(InstanceClassLoaderKlass) \
649 f(InstanceMirrorKlass) \
650 f(InstanceRefKlass) \
651 f(Method) \
652 f(ObjArrayKlass) \
653 f(TypeArrayKlass)
654
655 class CppVtableInfo {
656 intptr_t _vtable_size;
657 intptr_t _cloned_vtable[1];
658 public:
659 static int num_slots(int vtable_size) {
660 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
661 }
662 int vtable_size() { return int(uintx(_vtable_size)); }
663 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
664 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
665 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
666 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
667 static size_t byte_size(int vtable_size) {
668 CppVtableInfo i;
669 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
670 }
671 };
672
673 template <class T> class CppVtableCloner : public T {
674 static intptr_t* vtable_of(Metadata& m) {
675 return *((intptr_t**)&m);
676 }
677 static CppVtableInfo* _info;
678
679 static int get_vtable_length(const char* name);
680
681 public:
682 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
683 static intptr_t* allocate(const char* name);
684
685 // Clone the vtable to ...
686 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
687
688 static void zero_vtable_clone() {
689 assert(DumpSharedSpaces, "dump-time only");
690 _info->zero();
691 }
692
693 // Switch the vtable pointer to point to the cloned vtable.
694 static void patch(Metadata* obj) {
695 assert(DumpSharedSpaces, "dump-time only");
696 *(void**)obj = (void*)(_info->cloned_vtable());
697 }
698
699 static bool is_valid_shared_object(const T* obj) {
700 intptr_t* vptr = *(intptr_t**)obj;
701 return vptr == _info->cloned_vtable();
702 }
703 };
704
705 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
706
707 template <class T>
708 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
709 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
710 int n = get_vtable_length(name);
711 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
712 _info->set_vtable_size(n);
713
714 intptr_t* p = clone_vtable(name, _info);
715 assert((char*)p == _md_region.top(), "must be");
716
717 return p;
718 }
719
720 template <class T>
721 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
722 if (!DumpSharedSpaces) {
723 assert(_info == 0, "_info is initialized only at dump time");
724 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
725 }
726 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
727 int n = info->vtable_size();
728 intptr_t* srcvtable = vtable_of(tmp);
729 intptr_t* dstvtable = info->cloned_vtable();
730
731 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
732 // safe to do memcpy.
733 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
734 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
735 return dstvtable + n;
736 }
737
738 // To determine the size of the vtable for each type, we use the following
739 // trick by declaring 2 subclasses:
740 //
741 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
742 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
743 //
744 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
745 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
746 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
747 // - Their last entry is different.
748 //
749 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
750 // and find the first entry that's different.
751 //
752 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
753 // esoteric compilers.
754
755 template <class T> class CppVtableTesterB: public T {
756 public:
757 virtual int last_virtual_method() {return 1;}
758 };
759
760 template <class T> class CppVtableTesterA : public T {
761 public:
762 virtual void* last_virtual_method() {
763 // Make this different than CppVtableTesterB::last_virtual_method so the C++
764 // compiler/linker won't alias the two functions.
765 return NULL;
766 }
767 };
768
769 template <class T>
770 int CppVtableCloner<T>::get_vtable_length(const char* name) {
771 CppVtableTesterA<T> a;
772 CppVtableTesterB<T> b;
773
774 intptr_t* avtable = vtable_of(a);
775 intptr_t* bvtable = vtable_of(b);
776
777 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
778 int vtable_len = 1;
779 for (; ; vtable_len++) {
780 if (avtable[vtable_len] != bvtable[vtable_len]) {
781 break;
782 }
783 }
784 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
785
786 return vtable_len;
787 }
788
789 #define ALLOC_CPP_VTABLE_CLONE(c) \
790 CppVtableCloner<c>::allocate(#c);
791
792 #define CLONE_CPP_VTABLE(c) \
793 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
794
795 #define ZERO_CPP_VTABLE(c) \
796 CppVtableCloner<c>::zero_vtable_clone();
797
798 // This can be called at both dump time and run time.
799 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
800 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
801 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
802 return p;
803 }
804
805 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
806 assert(DumpSharedSpaces, "dump-time only");
807 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
808 }
809
810 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
811 void MetaspaceShared::allocate_cpp_vtable_clones() {
812 assert(DumpSharedSpaces, "dump-time only");
813 // Layout (each slot is a intptr_t):
814 // [number of slots in the first vtable = n1]
815 // [ <n1> slots for the first vtable]
816 // [number of slots in the first second = n2]
817 // [ <n2> slots for the second vtable]
818 // ...
819 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
820 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
821 }
822
823 // Switch the vtable pointer to point to the cloned vtable. We assume the
824 // vtable pointer is in first slot in object.
825 void MetaspaceShared::patch_cpp_vtable_pointers() {
826 int n = _global_klass_objects->length();
827 for (int i = 0; i < n; i++) {
828 Klass* obj = _global_klass_objects->at(i);
829 if (obj->is_instance_klass()) {
830 InstanceKlass* ik = InstanceKlass::cast(obj);
831 if (ik->is_class_loader_instance_klass()) {
832 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
833 } else if (ik->is_reference_instance_klass()) {
834 CppVtableCloner<InstanceRefKlass>::patch(ik);
835 } else if (ik->is_mirror_instance_klass()) {
836 CppVtableCloner<InstanceMirrorKlass>::patch(ik);
837 } else {
838 CppVtableCloner<InstanceKlass>::patch(ik);
839 }
840 ConstantPool* cp = ik->constants();
841 CppVtableCloner<ConstantPool>::patch(cp);
842 for (int j = 0; j < ik->methods()->length(); j++) {
843 Method* m = ik->methods()->at(j);
844 CppVtableCloner<Method>::patch(m);
845 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
846 }
847 } else if (obj->is_objArray_klass()) {
848 CppVtableCloner<ObjArrayKlass>::patch(obj);
849 } else {
850 assert(obj->is_typeArray_klass(), "sanity");
851 CppVtableCloner<TypeArrayKlass>::patch(obj);
852 }
853 }
854 }
855
856 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
857 assert(is_in_shared_metaspace(m), "must be");
858 return CppVtableCloner<Method>::is_valid_shared_object(m);
859 }
860
861 // Closure for serializing initialization data out to a data area to be
862 // written to the shared file.
863
864 class WriteClosure : public SerializeClosure {
865 private:
866 DumpRegion* _dump_region;
867
868 public:
869 WriteClosure(DumpRegion* r) {
870 _dump_region = r;
871 }
872
873 void do_ptr(void** p) {
874 _dump_region->append_intptr_t((intptr_t)*p);
875 }
876
877 void do_u4(u4* p) {
878 void* ptr = (void*)(uintx(*p));
879 do_ptr(&ptr);
880 }
881
882 void do_tag(int tag) {
883 _dump_region->append_intptr_t((intptr_t)tag);
884 }
885
886 void do_oop(oop* o) {
887 if (*o == NULL) {
888 _dump_region->append_intptr_t(0);
889 } else {
890 assert(MetaspaceShared::is_heap_object_archiving_allowed(),
891 "Archiving heap object is not allowed");
892 _dump_region->append_intptr_t(
893 (intptr_t)CompressedOops::encode_not_null(*o));
894 }
895 }
896
897 void do_region(u_char* start, size_t size) {
898 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
899 assert(size % sizeof(intptr_t) == 0, "bad size");
900 do_tag((int)size);
901 while (size > 0) {
902 _dump_region->append_intptr_t(*(intptr_t*)start);
903 start += sizeof(intptr_t);
904 size -= sizeof(intptr_t);
905 }
906 }
907
908 bool reading() const { return false; }
909 };
910
911 // This is for dumping detailed statistics for the allocations
912 // in the shared spaces.
913 class DumpAllocStats : public ResourceObj {
914 public:
915
916 // Here's poor man's enum inheritance
917 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
918 METASPACE_OBJ_TYPES_DO(f) \
919 f(SymbolHashentry) \
920 f(SymbolBucket) \
921 f(StringHashentry) \
922 f(StringBucket) \
923 f(Other)
924
925 enum Type {
926 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
927 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
928 _number_of_types
929 };
930
931 static const char * type_name(Type type) {
932 switch(type) {
933 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
934 default:
935 ShouldNotReachHere();
936 return NULL;
937 }
938 }
939
940 public:
941 enum { RO = 0, RW = 1 };
942
943 int _counts[2][_number_of_types];
944 int _bytes [2][_number_of_types];
945
946 DumpAllocStats() {
947 memset(_counts, 0, sizeof(_counts));
948 memset(_bytes, 0, sizeof(_bytes));
949 };
950
951 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
952 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
953 int which = (read_only) ? RO : RW;
954 _counts[which][type] ++;
955 _bytes [which][type] += byte_size;
956 }
957
958 void record_other_type(int byte_size, bool read_only) {
959 int which = (read_only) ? RO : RW;
960 _bytes [which][OtherType] += byte_size;
961 }
962 void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
963 };
964
965 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
966 // Calculate size of data that was not allocated by Metaspace::allocate()
967 MetaspaceSharedStats *stats = MetaspaceShared::stats();
968
969 // symbols
970 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
971 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
972
973 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
974 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
975
976 // strings
977 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
978 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
979
980 _counts[RO][StringBucketType] = stats->string.bucket_count;
981 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
982
983 // TODO: count things like dictionary, vtable, etc
984 _bytes[RW][OtherType] += mc_all + md_all;
985 rw_all += mc_all + md_all; // mc/md are mapped Read/Write
986
987 // prevent divide-by-zero
988 if (ro_all < 1) {
989 ro_all = 1;
990 }
991 if (rw_all < 1) {
992 rw_all = 1;
993 }
994
995 int all_ro_count = 0;
996 int all_ro_bytes = 0;
997 int all_rw_count = 0;
998 int all_rw_bytes = 0;
999
1000 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
1001 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
1002 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
1003 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
1004
1005 LogMessage(cds) msg;
1006
1007 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
1008 msg.info("%s", hdr);
1009 msg.info("%s", sep);
1010 for (int type = 0; type < int(_number_of_types); type ++) {
1011 const char *name = type_name((Type)type);
1012 int ro_count = _counts[RO][type];
1013 int ro_bytes = _bytes [RO][type];
1014 int rw_count = _counts[RW][type];
1015 int rw_bytes = _bytes [RW][type];
1016 int count = ro_count + rw_count;
1017 int bytes = ro_bytes + rw_bytes;
1018
1019 double ro_perc = percent_of(ro_bytes, ro_all);
1020 double rw_perc = percent_of(rw_bytes, rw_all);
1021 double perc = percent_of(bytes, ro_all + rw_all);
1022
1023 msg.info(fmt_stats, name,
1024 ro_count, ro_bytes, ro_perc,
1025 rw_count, rw_bytes, rw_perc,
1026 count, bytes, perc);
1027
1028 all_ro_count += ro_count;
1029 all_ro_bytes += ro_bytes;
1030 all_rw_count += rw_count;
1031 all_rw_bytes += rw_bytes;
1032 }
1033
1034 int all_count = all_ro_count + all_rw_count;
1035 int all_bytes = all_ro_bytes + all_rw_bytes;
1036
1037 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1038 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1039 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1040
1041 msg.info("%s", sep);
1042 msg.info(fmt_stats, "Total",
1043 all_ro_count, all_ro_bytes, all_ro_perc,
1044 all_rw_count, all_rw_bytes, all_rw_perc,
1045 all_count, all_bytes, all_perc);
1046
1047 assert(all_ro_bytes == ro_all, "everything should have been counted");
1048 assert(all_rw_bytes == rw_all, "everything should have been counted");
1049
1050 #undef fmt_stats
1051 }
1052
1053 // Populate the shared space.
1054
1055 class VM_PopulateDumpSharedSpace: public VM_Operation {
1056 private:
1057 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1058 GrowableArray<MemRegion> *_open_archive_heap_regions;
1059
1060 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1061 void dump_symbols();
1062 char* dump_read_only_tables();
1063 void print_region_stats();
1064 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1065 const char *name, const size_t total_size);
1066 public:
1067
1068 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1069 void doit(); // outline because gdb sucks
1070 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
1071 bool allow_nested_vm_operations() const { return true; }
1072 }; // class VM_PopulateDumpSharedSpace
1073
1074 class SortedSymbolClosure: public SymbolClosure {
1075 GrowableArray<Symbol*> _symbols;
1076 virtual void do_symbol(Symbol** sym) {
1077 assert((*sym)->is_permanent(), "archived symbols must be permanent");
1078 _symbols.append(*sym);
1079 }
1080 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
1081 if (a[0] < b[0]) {
1082 return -1;
1083 } else if (a[0] == b[0]) {
1084 return 0;
1085 } else {
1086 return 1;
1087 }
1088 }
1089
1090 public:
1091 SortedSymbolClosure() {
1092 SymbolTable::symbols_do(this);
1093 _symbols.sort(compare_symbols_by_address);
1094 }
1095 GrowableArray<Symbol*>* get_sorted_symbols() {
1096 return &_symbols;
1097 }
1098 };
1099
1100 // ArchiveCompactor --
1101 //
1102 // This class is the central piece of shared archive compaction -- all metaspace data are
1103 // initially allocated outside of the shared regions. ArchiveCompactor copies the
1104 // metaspace data into their final location in the shared regions.
1105
1106 class ArchiveCompactor : AllStatic {
1107 static DumpAllocStats* _alloc_stats;
1108 static SortedSymbolClosure* _ssc;
1109
1110 static unsigned my_hash(const address& a) {
1111 return primitive_hash<address>(a);
1112 }
1113 static bool my_equals(const address& a0, const address& a1) {
1114 return primitive_equals<address>(a0, a1);
1115 }
1116 typedef ResourceHashtable<
1117 address, address,
1118 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address>
1119 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address>
1120 16384, ResourceObj::C_HEAP> RelocationTable;
1121 static RelocationTable* _new_loc_table;
1122
1123 public:
1124 static void initialize() {
1125 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1126 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable;
1127 }
1128 static DumpAllocStats* alloc_stats() {
1129 return _alloc_stats;
1130 }
1131
1132 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1133 address obj = ref->obj();
1134 int bytes = ref->size() * BytesPerWord;
1135 char* p;
1136 size_t alignment = BytesPerWord;
1137 char* oldtop;
1138 char* newtop;
1139
1140 if (read_only) {
1141 oldtop = _ro_region.top();
1142 p = _ro_region.allocate(bytes, alignment);
1143 newtop = _ro_region.top();
1144 } else {
1145 oldtop = _rw_region.top();
1146 p = _rw_region.allocate(bytes, alignment);
1147 newtop = _rw_region.top();
1148 }
1149 memcpy(p, obj, bytes);
1150 bool isnew = _new_loc_table->put(obj, (address)p);
1151 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1152 assert(isnew, "must be");
1153
1154 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1155 if (ref->msotype() == MetaspaceObj::SymbolType) {
1156 uintx delta = MetaspaceShared::object_delta(p);
1157 if (delta > MAX_SHARED_DELTA) {
1158 // This is just a sanity check and should not appear in any real world usage. This
1159 // happens only if you allocate more than 2GB of Symbols and would require
1160 // millions of shared classes.
1161 vm_exit_during_initialization("Too many Symbols in the CDS archive",
1162 "Please reduce the number of shared classes.");
1163 }
1164 }
1165 }
1166
1167 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1168 address* pp = _new_loc_table->get(ref->obj());
1169 assert(pp != NULL, "must be");
1170 return *pp;
1171 }
1172
1173 private:
1174 // Makes a shallow copy of visited MetaspaceObj's
1175 class ShallowCopier: public UniqueMetaspaceClosure {
1176 bool _read_only;
1177 public:
1178 ShallowCopier(bool read_only) : _read_only(read_only) {}
1179
1180 virtual void do_unique_ref(Ref* ref, bool read_only) {
1181 if (read_only == _read_only) {
1182 allocate(ref, read_only);
1183 }
1184 }
1185 };
1186
1187 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1188 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1189 public:
1190 virtual void do_unique_ref(Ref* ref, bool read_only) {
1191 address new_loc = get_new_loc(ref);
1192 RefRelocator refer;
1193 ref->metaspace_pointers_do_at(&refer, new_loc);
1194 }
1195 };
1196
1197 // Relocate a reference to point to its shallow copy
1198 class RefRelocator: public MetaspaceClosure {
1199 public:
1200 virtual bool do_ref(Ref* ref, bool read_only) {
1201 if (ref->not_null()) {
1202 ref->update(get_new_loc(ref));
1203 }
1204 return false; // Do not recurse.
1205 }
1206 };
1207
1208 #ifdef ASSERT
1209 class IsRefInArchiveChecker: public MetaspaceClosure {
1210 public:
1211 virtual bool do_ref(Ref* ref, bool read_only) {
1212 if (ref->not_null()) {
1213 char* obj = (char*)ref->obj();
1214 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1215 "must be relocated to point to CDS archive");
1216 }
1217 return false; // Do not recurse.
1218 }
1219 };
1220 #endif
1221
1222 public:
1223 static void copy_and_compact() {
1224 // We should no longer allocate anything from the metaspace, so that
1225 // we can have a stable set of MetaspaceObjs to work with.
1226 Metaspace::freeze();
1227
1228 ResourceMark rm;
1229 SortedSymbolClosure the_ssc; // StackObj
1230 _ssc = &the_ssc;
1231
1232 tty->print_cr("Scanning all metaspace objects ... ");
1233 {
1234 // allocate and shallow-copy RW objects, immediately following the MC region
1235 tty->print_cr("Allocating RW objects ... ");
1236 _mc_region.pack(&_rw_region);
1237
1238 ResourceMark rm;
1239 ShallowCopier rw_copier(false);
1240 iterate_roots(&rw_copier);
1241 }
1242 {
1243 // allocate and shallow-copy of RO object, immediately following the RW region
1244 tty->print_cr("Allocating RO objects ... ");
1245 _rw_region.pack(&_ro_region);
1246
1247 ResourceMark rm;
1248 ShallowCopier ro_copier(true);
1249 iterate_roots(&ro_copier);
1250 }
1251 {
1252 tty->print_cr("Relocating embedded pointers ... ");
1253 ResourceMark rm;
1254 ShallowCopyEmbeddedRefRelocator emb_reloc;
1255 iterate_roots(&emb_reloc);
1256 }
1257 {
1258 tty->print_cr("Relocating external roots ... ");
1259 ResourceMark rm;
1260 RefRelocator ext_reloc;
1261 iterate_roots(&ext_reloc);
1262 }
1263
1264 #ifdef ASSERT
1265 {
1266 tty->print_cr("Verifying external roots ... ");
1267 ResourceMark rm;
1268 IsRefInArchiveChecker checker;
1269 iterate_roots(&checker);
1270 }
1271 #endif
1272
1273
1274 // cleanup
1275 _ssc = NULL;
1276 }
1277
1278 // We must relocate the System::_well_known_klasses only after we have copied the
1279 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1280 // old objects which assert that their klass is the original klass.
1281 static void relocate_well_known_klasses() {
1282 {
1283 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
1284 ResourceMark rm;
1285 RefRelocator ext_reloc;
1286 SystemDictionary::well_known_klasses_do(&ext_reloc);
1287 }
1288 // NOTE: after this point, we shouldn't have any globals that can reach the old
1289 // objects.
1290
1291 // We cannot use any of the objects in the heap anymore (except for the objects
1292 // in the CDS shared string regions) because their headers no longer point to
1293 // valid Klasses.
1294 }
1295
1296 static void iterate_roots(MetaspaceClosure* it) {
1297 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
1298 for (int i=0; i<symbols->length(); i++) {
1299 it->push(symbols->adr_at(i));
1300 }
1301 if (_global_klass_objects != NULL) {
1302 // Need to fix up the pointers
1303 for (int i = 0; i < _global_klass_objects->length(); i++) {
1304 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1305 it->push(_global_klass_objects->adr_at(i));
1306 }
1307 }
1308 FileMapInfo::metaspace_pointers_do(it);
1309 SystemDictionary::classes_do(it);
1310 Universe::metaspace_pointers_do(it);
1311 SymbolTable::metaspace_pointers_do(it);
1312 vmSymbols::metaspace_pointers_do(it);
1313 }
1314
1315 static Klass* get_relocated_klass(Klass* orig_klass) {
1316 assert(DumpSharedSpaces, "dump time only");
1317 address* pp = _new_loc_table->get((address)orig_klass);
1318 assert(pp != NULL, "must be");
1319 Klass* klass = (Klass*)(*pp);
1320 assert(klass->is_klass(), "must be");
1321 return klass;
1322 }
1323 };
1324
1325 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1326 SortedSymbolClosure* ArchiveCompactor::_ssc;
1327 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1328
1329 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
1330 DumpRegion* dump_region, bool read_only, bool allow_exec) {
1331 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1332 }
1333
1334 void VM_PopulateDumpSharedSpace::dump_symbols() {
1335 tty->print_cr("Dumping symbol table ...");
1336
1337 NOT_PRODUCT(SymbolTable::verify());
1338 SymbolTable::write_to_archive();
1339 }
1340
1341 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1342 char* oldtop = _ro_region.top();
1343 // Reorder the system dictionary. Moving the symbols affects
1344 // how the hash table indices are calculated.
1345 SystemDictionary::reorder_dictionary_for_sharing();
1346
1347 tty->print("Removing java_mirror ... ");
1348 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
1349 clear_basic_type_mirrors();
1350 }
1351 remove_java_mirror_in_classes();
1352 tty->print_cr("done. ");
1353 NOT_PRODUCT(SystemDictionary::verify();)
1354
1355 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets();
1356 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t));
1357 SystemDictionary::copy_buckets(buckets_top, _ro_region.top());
1358
1359 size_t table_bytes = SystemDictionary::count_bytes_for_table();
1360 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t));
1361 SystemDictionary::copy_table(table_top, _ro_region.top());
1362
1363 // Write the archived object sub-graph infos. For each klass with sub-graphs,
1364 // the info includes the static fields (sub-graph entry points) and Klasses
1365 // of objects included in the sub-graph.
1366 HeapShared::write_archived_subgraph_infos();
1367
1368 // Write the other data to the output array.
1369 WriteClosure wc(&_ro_region);
1370 MetaspaceShared::serialize(&wc);
1371
1372 char* newtop = _ro_region.top();
1373 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true);
1374 return buckets_top;
1375 }
1376
1377 void VM_PopulateDumpSharedSpace::doit() {
1378 Thread* THREAD = VMThread::vm_thread();
1379
1380 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1381
1382 NOT_PRODUCT(SystemDictionary::verify();)
1383 // The following guarantee is meant to ensure that no loader constraints
1384 // exist yet, since the constraints table is not shared. This becomes
1385 // more important now that we don't re-initialize vtables/itables for
1386 // shared classes at runtime, where constraints were previously created.
1387 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1388 "loader constraints are not saved");
1389 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1390 "placeholders are not saved");
1391 // Revisit and implement this if we prelink method handle call sites:
1392 guarantee(SystemDictionary::invoke_method_table() == NULL ||
1393 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
1394 "invoke method table is not saved");
1395
1396 // At this point, many classes have been loaded.
1397 // Gather systemDictionary classes in a global array and do everything to
1398 // that so we don't have to walk the SystemDictionary again.
1399 _global_klass_objects = new GrowableArray<Klass*>(1000);
1400 CollectClassesClosure collect_classes;
1401 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1402
1403 tty->print_cr("Number of classes %d", _global_klass_objects->length());
1404 {
1405 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1406 for (int i = 0; i < _global_klass_objects->length(); i++) {
1407 Klass* k = _global_klass_objects->at(i);
1408 if (k->is_instance_klass()) {
1409 num_inst ++;
1410 } else if (k->is_objArray_klass()) {
1411 num_obj_array ++;
1412 } else {
1413 assert(k->is_typeArray_klass(), "sanity");
1414 num_type_array ++;
1415 }
1416 }
1417 tty->print_cr(" instance classes = %5d", num_inst);
1418 tty->print_cr(" obj array classes = %5d", num_obj_array);
1419 tty->print_cr(" type array classes = %5d", num_type_array);
1420 }
1421
1422 // Ensure the ConstMethods won't be modified at run-time
1423 tty->print("Updating ConstMethods ... ");
1424 rewrite_nofast_bytecodes_and_calculate_fingerprints();
1425 tty->print_cr("done. ");
1426
1427 // Move classes from platform/system dictionaries into the boot dictionary
1428 SystemDictionary::combine_shared_dictionaries();
1429
1430 // Make sure all classes have a correct loader type.
1431 ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(MetaspaceShared::check_shared_class_loader_type);
1432
1433 // Remove all references outside the metadata
1434 tty->print("Removing unshareable information ... ");
1435 remove_unshareable_in_classes();
1436 tty->print_cr("done. ");
1437
1438 // We don't support archiving anonymous classes. Verify that they are not stored in
1439 // the any dictionaries.
1440 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries());
1441
1442 SystemDictionaryShared::finalize_verification_constraints();
1443
1444 ArchiveCompactor::initialize();
1445 ArchiveCompactor::copy_and_compact();
1446
1447 dump_symbols();
1448
1449 // Dump supported java heap objects
1450 _closed_archive_heap_regions = NULL;
1451 _open_archive_heap_regions = NULL;
1452 dump_java_heap_objects();
1453
1454 ArchiveCompactor::relocate_well_known_klasses();
1455
1456 char* read_only_tables_start = dump_read_only_tables();
1457 _ro_region.pack(&_md_region);
1458
1459 char* vtbl_list = _md_region.top();
1460 MetaspaceShared::allocate_cpp_vtable_clones();
1461 _md_region.pack(&_od_region);
1462
1463 // Relocate the archived class file data into the od region
1464 relocate_cached_class_file();
1465 _od_region.pack();
1466
1467 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size
1468 // is just the spaces between the two ends.
1469 size_t core_spaces_size = _od_region.end() - _mc_region.base();
1470 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
1471 "should already be aligned");
1472
1473 // During patching, some virtual methods may be called, so at this point
1474 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
1475 MetaspaceShared::patch_cpp_vtable_pointers();
1476
1477 // The vtable clones contain addresses of the current process.
1478 // We don't want to write these addresses into the archive.
1479 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1480
1481 // Create and write the archive file that maps the shared spaces.
1482
1483 FileMapInfo* mapinfo = new FileMapInfo();
1484 mapinfo->populate_header(os::vm_allocation_granularity());
1485 mapinfo->set_read_only_tables_start(read_only_tables_start);
1486 mapinfo->set_misc_data_patching_start(vtbl_list);
1487 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
1488 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
1489 mapinfo->set_core_spaces_size(core_spaces_size);
1490
1491 for (int pass=1; pass<=2; pass++) {
1492 if (pass == 1) {
1493 // The first pass doesn't actually write the data to disk. All it
1494 // does is to update the fields in the mapinfo->_header.
1495 } else {
1496 // After the first pass, the contents of mapinfo->_header are finalized,
1497 // so we can compute the header's CRC, and write the contents of the header
1498 // and the regions into disk.
1499 mapinfo->open_for_write();
1500 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1501 }
1502 mapinfo->write_header();
1503
1504 // NOTE: md contains the trampoline code for method entries, which are patched at run time,
1505 // so it needs to be read/write.
1506 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1507 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1508 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1509 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
1510 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false);
1511
1512 _total_string_region_size = mapinfo->write_archive_heap_regions(
1513 _closed_archive_heap_regions,
1514 MetaspaceShared::first_string,
1515 MetaspaceShared::max_strings);
1516 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1517 _open_archive_heap_regions,
1518 MetaspaceShared::first_open_archive_heap_region,
1519 MetaspaceShared::max_open_archive_heap_region);
1520 }
1521
1522 mapinfo->close();
1523
1524 // Restore the vtable in case we invoke any virtual methods.
1525 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
1526
1527 print_region_stats();
1528
1529 if (log_is_enabled(Info, cds)) {
1530 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1531 int(_mc_region.used()), int(_md_region.used()));
1532 }
1533
1534 if (PrintSystemDictionaryAtExit) {
1535 SystemDictionary::print();
1536 }
1537 // There may be other pending VM operations that operate on the InstanceKlasses,
1538 // which will fail because InstanceKlasses::remove_unshareable_info()
1539 // has been called. Forget these operations and exit the VM directly.
1540 vm_direct_exit(0);
1541 }
1542
1543 void VM_PopulateDumpSharedSpace::print_region_stats() {
1544 // Print statistics of all the regions
1545 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1546 _mc_region.reserved() + _md_region.reserved() +
1547 _od_region.reserved() +
1548 _total_string_region_size +
1549 _total_open_archive_region_size;
1550 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1551 _mc_region.used() + _md_region.used() +
1552 _od_region.used() +
1553 _total_string_region_size +
1554 _total_open_archive_region_size;
1555 const double total_u_perc = percent_of(total_bytes, total_reserved);
1556
1557 _mc_region.print(total_reserved);
1558 _rw_region.print(total_reserved);
1559 _ro_region.print(total_reserved);
1560 _md_region.print(total_reserved);
1561 _od_region.print(total_reserved);
1562 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved);
1563 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1564
1565 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1566 total_bytes, total_reserved, total_u_perc);
1567 }
1568
1569 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1570 const char *name, const size_t total_size) {
1571 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1572 for (int i = 0; i < arr_len; i++) {
1573 char* start = (char*)heap_mem->at(i).start();
1574 size_t size = heap_mem->at(i).byte_size();
1575 char* top = start + size;
1576 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,
1577 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1578
1579 }
1580 }
1581
1582 // Update a Java object to point its Klass* to the new location after
1583 // shared archive has been compacted.
1584 void MetaspaceShared::relocate_klass_ptr(oop o) {
1585 assert(DumpSharedSpaces, "sanity");
1586 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1587 o->set_klass(k);
1588 }
1589
1590 Klass* MetaspaceShared::get_relocated_klass(Klass *k) {
1591 assert(DumpSharedSpaces, "sanity");
1592 return ArchiveCompactor::get_relocated_klass(k);
1593 }
1594
1595 class LinkSharedClassesClosure : public KlassClosure {
1596 Thread* THREAD;
1597 bool _made_progress;
1598 public:
1599 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1600
1601 void reset() { _made_progress = false; }
1602 bool made_progress() const { return _made_progress; }
1603
1604 void do_klass(Klass* k) {
1605 if (k->is_instance_klass()) {
1606 InstanceKlass* ik = InstanceKlass::cast(k);
1607 // Link the class to cause the bytecodes to be rewritten and the
1608 // cpcache to be created. Class verification is done according
1609 // to -Xverify setting.
1610 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1611 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1612
1613 ik->constants()->resolve_class_constants(THREAD);
1614 }
1615 }
1616 };
1617
1618 class CheckSharedClassesClosure : public KlassClosure {
1619 bool _made_progress;
1620 public:
1621 CheckSharedClassesClosure() : _made_progress(false) {}
1622
1623 void reset() { _made_progress = false; }
1624 bool made_progress() const { return _made_progress; }
1625 void do_klass(Klass* k) {
1626 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
1627 _made_progress = true;
1628 }
1629 }
1630 };
1631
1632 void MetaspaceShared::check_shared_class_loader_type(InstanceKlass* ik) {
1633 ResourceMark rm;
1634 if (ik->shared_classpath_index() == UNREGISTERED_INDEX) {
1635 guarantee(ik->loader_type() == 0,
1636 "Class loader type must not be set for this class %s", ik->name()->as_C_string());
1637 } else {
1638 guarantee(ik->loader_type() != 0,
1639 "Class loader type must be set for this class %s", ik->name()->as_C_string());
1640 }
1641 }
1642
1643 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1644 // We need to iterate because verification may cause additional classes
1645 // to be loaded.
1646 LinkSharedClassesClosure link_closure(THREAD);
1647 do {
1648 link_closure.reset();
1649 ClassLoaderDataGraph::loaded_classes_do(&link_closure);
1650 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1651 } while (link_closure.made_progress());
1652
1653 if (_has_error_classes) {
1654 // Mark all classes whose super class or interfaces failed verification.
1655 CheckSharedClassesClosure check_closure;
1656 do {
1657 // Not completely sure if we need to do this iteratively. Anyway,
1658 // we should come here only if there are unverifiable classes, which
1659 // shouldn't happen in normal cases. So better safe than sorry.
1660 check_closure.reset();
1661 ClassLoaderDataGraph::loaded_classes_do(&check_closure);
1662 } while (check_closure.made_progress());
1663
1664 if (IgnoreUnverifiableClassesDuringDump) {
1665 // This is useful when running JCK or SQE tests. You should not
1666 // enable this when running real apps.
1667 SystemDictionary::remove_classes_in_error_state();
1668 } else {
1669 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
1670 exit(1);
1671 }
1672 }
1673 }
1674
1675 void MetaspaceShared::prepare_for_dumping() {
1676 Arguments::check_unsupported_dumping_properties();
1677 ClassLoader::initialize_shared_path();
1678 }
1679
1680 // Preload classes from a list, populate the shared spaces and dump to a
1681 // file.
1682 void MetaspaceShared::preload_and_dump(TRAPS) {
1683 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1684 ResourceMark rm;
1685 char class_list_path_str[JVM_MAXPATHLEN];
1686 // Preload classes to be shared.
1687 // Should use some os:: method rather than fopen() here. aB.
1688 const char* class_list_path;
1689 if (SharedClassListFile == NULL) {
1690 // Construct the path to the class list (in jre/lib)
1691 // Walk up two directories from the location of the VM and
1692 // optionally tack on "lib" (depending on platform)
1693 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1694 for (int i = 0; i < 3; i++) {
1695 char *end = strrchr(class_list_path_str, *os::file_separator());
1696 if (end != NULL) *end = '\0';
1697 }
1698 int class_list_path_len = (int)strlen(class_list_path_str);
1699 if (class_list_path_len >= 3) {
1700 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1701 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1702 jio_snprintf(class_list_path_str + class_list_path_len,
1703 sizeof(class_list_path_str) - class_list_path_len,
1704 "%slib", os::file_separator());
1705 class_list_path_len += 4;
1706 }
1707 }
1708 }
1709 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1710 jio_snprintf(class_list_path_str + class_list_path_len,
1711 sizeof(class_list_path_str) - class_list_path_len,
1712 "%sclasslist", os::file_separator());
1713 }
1714 class_list_path = class_list_path_str;
1715 } else {
1716 class_list_path = SharedClassListFile;
1717 }
1718
1719 tty->print_cr("Loading classes to share ...");
1720 _has_error_classes = false;
1721 int class_count = preload_classes(class_list_path, THREAD);
1722 if (ExtraSharedClassListFile) {
1723 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1724 }
1725 tty->print_cr("Loading classes to share: done.");
1726
1727 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1728
1729 // Rewrite and link classes
1730 tty->print_cr("Rewriting and linking classes ...");
1731
1732 // Link any classes which got missed. This would happen if we have loaded classes that
1733 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1734 // fails verification, all other interfaces that were not specified in the classlist but
1735 // are implemented by K are not verified.
1736 link_and_cleanup_shared_classes(CATCH);
1737 tty->print_cr("Rewriting and linking classes: done");
1738
1739 SystemDictionary::clear_invoke_method_table();
1740
1741 VM_PopulateDumpSharedSpace op;
1742 VMThread::execute(&op);
1743 }
1744 }
1745
1746
1747 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1748 ClassListParser parser(class_list_path);
1749 int class_count = 0;
1750
1751 while (parser.parse_one_line()) {
1752 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
1753 if (HAS_PENDING_EXCEPTION) {
1754 if (klass == NULL &&
1755 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1756 // print a warning only when the pending exception is class not found
1757 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
1758 }
1759 CLEAR_PENDING_EXCEPTION;
1760 }
1761 if (klass != NULL) {
1762 if (log_is_enabled(Trace, cds)) {
1763 ResourceMark rm;
1764 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
1765 }
1766
1767 if (klass->is_instance_klass()) {
1768 InstanceKlass* ik = InstanceKlass::cast(klass);
1769
1770 // Link the class to cause the bytecodes to be rewritten and the
1771 // cpcache to be created. The linking is done as soon as classes
1772 // are loaded in order that the related data structures (klass and
1773 // cpCache) are located together.
1774 try_link_class(ik, THREAD);
1775 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1776 }
1777
1778 class_count++;
1779 }
1780 }
1781
1782 return class_count;
1783 }
1784
1785 // Returns true if the class's status has changed
1786 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
1787 assert(DumpSharedSpaces, "should only be called during dumping");
1788 if (ik->init_state() < InstanceKlass::linked) {
1789 bool saved = BytecodeVerificationLocal;
1790 if (ik->loader_type() == 0 && ik->class_loader() == NULL) {
1791 // The verification decision is based on BytecodeVerificationRemote
1792 // for non-system classes. Since we are using the NULL classloader
1793 // to load non-system classes for customized class loaders during dumping,
1794 // we need to temporarily change BytecodeVerificationLocal to be the same as
1795 // BytecodeVerificationRemote. Note this can cause the parent system
1796 // classes also being verified. The extra overhead is acceptable during
1797 // dumping.
1798 BytecodeVerificationLocal = BytecodeVerificationRemote;
1799 }
1800 ik->link_class(THREAD);
1801 if (HAS_PENDING_EXCEPTION) {
1802 ResourceMark rm;
1803 tty->print_cr("Preload Warning: Verification failed for %s",
1804 ik->external_name());
1805 CLEAR_PENDING_EXCEPTION;
1806 ik->set_in_error_state();
1807 _has_error_classes = true;
1808 }
1809 BytecodeVerificationLocal = saved;
1810 return true;
1811 } else {
1812 return false;
1813 }
1814 }
1815
1816 #if INCLUDE_CDS_JAVA_HEAP
1817 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1818 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
1819 if (log_is_enabled(Info, cds)) {
1820 log_info(cds)(
1821 "Archived java heap is not supported as UseG1GC, "
1822 "UseCompressedOops and UseCompressedClassPointers are required."
1823 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.",
1824 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
1825 BOOL_TO_STR(UseCompressedClassPointers));
1826 }
1827 return;
1828 }
1829
1830 {
1831 NoSafepointVerifier nsv;
1832
1833 // Cache for recording where the archived objects are copied to
1834 MetaspaceShared::create_archive_object_cache();
1835
1836 tty->print_cr("Dumping objects to closed archive heap region ...");
1837 NOT_PRODUCT(StringTable::verify());
1838 // The closed space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details.
1839 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
1840 MetaspaceShared::dump_closed_archive_heap_objects(_closed_archive_heap_regions);
1841
1842 tty->print_cr("Dumping objects to open archive heap region ...");
1843 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
1844 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions);
1845
1846 MetaspaceShared::destroy_archive_object_cache();
1847 }
1848
1849 G1HeapVerifier::verify_archive_regions();
1850 }
1851
1852 void MetaspaceShared::dump_closed_archive_heap_objects(
1853 GrowableArray<MemRegion> * closed_archive) {
1854 assert(is_heap_object_archiving_allowed(), "Cannot dump java heap objects");
1855
1856 Thread* THREAD = Thread::current();
1857 G1CollectedHeap::heap()->begin_archive_alloc_range();
1858
1859 // Archive interned string objects
1860 StringTable::write_to_archive();
1861
1862 G1CollectedHeap::heap()->end_archive_alloc_range(closed_archive,
1863 os::vm_allocation_granularity());
1864 }
1865
1866 void MetaspaceShared::dump_open_archive_heap_objects(
1867 GrowableArray<MemRegion> * open_archive) {
1868 assert(UseG1GC, "Only support G1 GC");
1869 assert(UseCompressedOops && UseCompressedClassPointers,
1870 "Only support UseCompressedOops and UseCompressedClassPointers enabled");
1871
1872 Thread* THREAD = Thread::current();
1873 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */);
1874
1875 java_lang_Class::archive_basic_type_mirrors(THREAD);
1876
1877 MetaspaceShared::archive_klass_objects(THREAD);
1878
1879 HeapShared::archive_module_graph_objects(THREAD);
1880
1881 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive,
1882 os::vm_allocation_granularity());
1883 }
1884
1885 unsigned MetaspaceShared::obj_hash(oop const& p) {
1886 assert(!p->mark()->has_bias_pattern(),
1887 "this object should never have been locked"); // so identity_hash won't safepoin
1888 unsigned hash = (unsigned)p->identity_hash();
1889 return hash;
1890 }
1891
1892 MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL;
1893 oop MetaspaceShared::find_archived_heap_object(oop obj) {
1894 assert(DumpSharedSpaces, "dump-time only");
1895 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
1896 oop* p = cache->get(obj);
1897 if (p != NULL) {
1898 return *p;
1899 } else {
1900 return NULL;
1901 }
1902 }
1903
1904 oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) {
1905 assert(DumpSharedSpaces, "dump-time only");
1906
1907 oop ao = find_archived_heap_object(obj);
1908 if (ao != NULL) {
1909 // already archived
1910 return ao;
1911 }
1912
1913 int len = obj->size();
1914 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
1915 return NULL;
1916 }
1917
1918 int hash = obj->identity_hash();
1919 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len);
1920 if (archived_oop != NULL) {
1921 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len);
1922 relocate_klass_ptr(archived_oop);
1923 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
1924 cache->put(obj, archived_oop);
1925 }
1926 log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT,
1927 p2i(obj), p2i(archived_oop));
1928 return archived_oop;
1929 }
1930
1931 oop MetaspaceShared::materialize_archived_object(oop obj) {
1932 if (obj != NULL) {
1933 return G1CollectedHeap::heap()->materialize_archived_object(obj);
1934 }
1935 return NULL;
1936 }
1937
1938 void MetaspaceShared::archive_klass_objects(Thread* THREAD) {
1939 int i;
1940 for (i = 0; i < _global_klass_objects->length(); i++) {
1941 Klass* k = _global_klass_objects->at(i);
1942
1943 // archive mirror object
1944 java_lang_Class::archive_mirror(k, CHECK);
1945
1946 // archive the resolved_referenes array
1947 if (k->is_instance_klass()) {
1948 InstanceKlass* ik = InstanceKlass::cast(k);
1949 ik->constants()->archive_resolved_references(THREAD);
1950 }
1951 }
1952 }
1953
1954 bool MetaspaceShared::is_archive_object(oop p) {
1955 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p);
1956 }
1957
1958 void MetaspaceShared::fixup_mapped_heap_regions() {
1959 FileMapInfo *mapinfo = FileMapInfo::current_info();
1960 mapinfo->fixup_mapped_heap_regions();
1961 }
1962 #endif // INCLUDE_CDS_JAVA_HEAP
1963
1964 // Closure for serializing initialization data in from a data area
1965 // (ptr_array) read from the shared file.
1966
1967 class ReadClosure : public SerializeClosure {
1968 private:
1969 intptr_t** _ptr_array;
1970
1971 inline intptr_t nextPtr() {
1972 return *(*_ptr_array)++;
1973 }
1974
1975 public:
1976 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
1977
1978 void do_ptr(void** p) {
1979 assert(*p == NULL, "initializing previous initialized pointer.");
1980 intptr_t obj = nextPtr();
1981 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1982 "hit tag while initializing ptrs.");
1983 *p = (void*)obj;
1984 }
1985
1986 void do_u4(u4* p) {
1987 intptr_t obj = nextPtr();
1988 *p = (u4)(uintx(obj));
1989 }
1990
1991 void do_tag(int tag) {
1992 int old_tag;
1993 old_tag = (int)(intptr_t)nextPtr();
1994 // do_int(&old_tag);
1995 assert(tag == old_tag, "old tag doesn't match");
1996 FileMapInfo::assert_mark(tag == old_tag);
1997 }
1998
1999 void do_oop(oop *p) {
2000 narrowOop o = (narrowOop)nextPtr();
2001 if (o == 0 || !MetaspaceShared::open_archive_heap_region_mapped()) {
2002 p = NULL;
2003 } else {
2004 assert(MetaspaceShared::is_heap_object_archiving_allowed(),
2005 "Archived heap object is not allowed");
2006 assert(MetaspaceShared::open_archive_heap_region_mapped(),
2007 "Open archive heap region is not mapped");
2008 *p = CompressedOops::decode_not_null(o);
2009 }
2010 }
2011
2012 void do_region(u_char* start, size_t size) {
2013 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
2014 assert(size % sizeof(intptr_t) == 0, "bad size");
2015 do_tag((int)size);
2016 while (size > 0) {
2017 *(intptr_t*)start = nextPtr();
2018 start += sizeof(intptr_t);
2019 size -= sizeof(intptr_t);
2020 }
2021 }
2022
2023 bool reading() const { return true; }
2024 };
2025
2026 // Return true if given address is in the misc data region
2027 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
2028 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
2029 }
2030
2031 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
2032 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
2033 return true;
2034 }
2035 return false;
2036 }
2037
2038 void MetaspaceShared::print_shared_spaces() {
2039 if (UseSharedSpaces) {
2040 FileMapInfo::current_info()->print_shared_spaces();
2041 }
2042 }
2043
2044
2045 // Map shared spaces at requested addresses and return if succeeded.
2046 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
2047 size_t image_alignment = mapinfo->alignment();
2048
2049 #ifndef _WINDOWS
2050 // Map in the shared memory and then map the regions on top of it.
2051 // On Windows, don't map the memory here because it will cause the
2052 // mappings of the regions to fail.
2053 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
2054 if (!shared_rs.is_reserved()) return false;
2055 #endif
2056
2057 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
2058
2059 char* ro_base = NULL; char* ro_top;
2060 char* rw_base = NULL; char* rw_top;
2061 char* mc_base = NULL; char* mc_top;
2062 char* md_base = NULL; char* md_top;
2063 char* od_base = NULL; char* od_top;
2064
2065 // Map each shared region
2066 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL &&
2067 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL &&
2068 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL &&
2069 (md_base = mapinfo->map_region(md, &md_top)) != NULL &&
2070 (od_base = mapinfo->map_region(od, &od_top)) != NULL &&
2071 (image_alignment == (size_t)os::vm_allocation_granularity()) &&
2072 mapinfo->validate_shared_path_table()) {
2073 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for
2074 // fast checking in MetaspaceShared::is_in_shared_metaspace() and
2075 // MetaspaceObj::is_shared().
2076 //
2077 // We require that mc->rw->ro->md->od to be laid out consecutively, with no
2078 // gaps between them. That way, we can ensure that the OS won't be able to
2079 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which
2080 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace().
2081 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be");
2082 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be");
2083 assert(mc_top == rw_base, "must be");
2084 assert(rw_top == ro_base, "must be");
2085 assert(ro_top == md_base, "must be");
2086 assert(md_top == od_base, "must be");
2087
2088 MetaspaceObj::_shared_metaspace_base = (void*)mc_base;
2089 MetaspaceObj::_shared_metaspace_top = (void*)od_top;
2090 return true;
2091 } else {
2092 // If there was a failure in mapping any of the spaces, unmap the ones
2093 // that succeeded
2094 if (ro_base != NULL) mapinfo->unmap_region(ro);
2095 if (rw_base != NULL) mapinfo->unmap_region(rw);
2096 if (mc_base != NULL) mapinfo->unmap_region(mc);
2097 if (md_base != NULL) mapinfo->unmap_region(md);
2098 if (od_base != NULL) mapinfo->unmap_region(od);
2099 #ifndef _WINDOWS
2100 // Release the entire mapped region
2101 shared_rs.release();
2102 #endif
2103 // If -Xshare:on is specified, print out the error message and exit VM,
2104 // otherwise, set UseSharedSpaces to false and continue.
2105 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
2106 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
2107 } else {
2108 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2109 }
2110 return false;
2111 }
2112 }
2113
2114 // Read the miscellaneous data from the shared file, and
2115 // serialize it out to its various destinations.
2116
2117 void MetaspaceShared::initialize_shared_spaces() {
2118 FileMapInfo *mapinfo = FileMapInfo::current_info();
2119 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
2120 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
2121 _core_spaces_size = mapinfo->core_spaces_size();
2122 char* buffer = mapinfo->misc_data_patching_start();
2123 clone_cpp_vtables((intptr_t*)buffer);
2124
2125 // The rest of the data is now stored in the RW region
2126 buffer = mapinfo->read_only_tables_start();
2127 int sharedDictionaryLen = *(intptr_t*)buffer;
2128 buffer += sizeof(intptr_t);
2129 int number_of_entries = *(intptr_t*)buffer;
2130 buffer += sizeof(intptr_t);
2131 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
2132 sharedDictionaryLen,
2133 number_of_entries);
2134 buffer += sharedDictionaryLen;
2135
2136 // The following data are the linked list elements
2137 // (HashtableEntry objects) for the shared dictionary table.
2138
2139 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
2140 buffer += sizeof(intptr_t);
2141 buffer += len;
2142
2143 // The table of archived java heap object sub-graph infos
2144 buffer = HeapShared::read_archived_subgraph_infos(buffer);
2145
2146 // Verify various attributes of the archive, plus initialize the
2147 // shared string/symbol tables
2148 intptr_t* array = (intptr_t*)buffer;
2149 ReadClosure rc(&array);
2150 serialize(&rc);
2151
2152 // Initialize the run-time symbol table.
2153 SymbolTable::create_table();
2154
2155 // Close the mapinfo file
2156 mapinfo->close();
2157
2158 if (PrintSharedArchiveAndExit) {
2159 if (PrintSharedDictionary) {
2160 tty->print_cr("\nShared classes:\n");
2161 SystemDictionary::print_shared(tty);
2162 }
2163 if (_archive_loading_failed) {
2164 tty->print_cr("archive is invalid");
2165 vm_exit(1);
2166 } else {
2167 tty->print_cr("archive is valid");
2168 vm_exit(0);
2169 }
2170 }
2171 }
2172
2173 // JVM/TI RedefineClasses() support:
2174 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2175 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2176
2177 if (UseSharedSpaces) {
2178 // remap the shared readonly space to shared readwrite, private
2179 FileMapInfo* mapinfo = FileMapInfo::current_info();
2180 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2181 return false;
2182 }
2183 _remapped_readwrite = true;
2184 }
2185 return true;
2186 }
2187
2188 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2189 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2190 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2191 // or so.
2192 _mc_region.print_out_of_space_msg(name, needed_bytes);
2193 _rw_region.print_out_of_space_msg(name, needed_bytes);
2194 _ro_region.print_out_of_space_msg(name, needed_bytes);
2195 _md_region.print_out_of_space_msg(name, needed_bytes);
2196 _od_region.print_out_of_space_msg(name, needed_bytes);
2197
2198 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2199 "Please reduce the number of shared classes.");
2200 }