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.inline.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/bitMap.hpp"
65 #include "utilities/defaultStream.hpp"
66 #include "utilities/hashtable.inline.hpp"
67 #if INCLUDE_G1GC
68 #include "gc/g1/g1Allocator.inline.hpp"
69 #include "gc/g1/g1CollectedHeap.hpp"
70 #endif
71
72 ReservedSpace MetaspaceShared::_shared_rs;
73 VirtualSpace MetaspaceShared::_shared_vs;
74 MetaspaceSharedStats MetaspaceShared::_stats;
75 bool MetaspaceShared::_has_error_classes;
76 bool MetaspaceShared::_archive_loading_failed = false;
77 bool MetaspaceShared::_remapped_readwrite = false;
78 bool MetaspaceShared::_open_archive_heap_region_mapped = false;
79 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
80 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
81 size_t MetaspaceShared::_core_spaces_size = 0;
82
83 // The CDS archive is divided into the following regions:
84 // mc - misc code (the method entry trampolines)
85 // rw - read-write metadata
86 // ro - read-only metadata and read-only tables
87 // md - misc data (the c++ vtables)
88 // od - optional data (original class files)
89 //
90 // s0 - shared strings(closed archive heap space) #0
91 // s1 - shared strings(closed archive heap space) #1 (may be empty)
92 // oa0 - open archive heap space #0
93 // oa1 - open archive heap space #1 (may be empty)
94 //
95 // The mc, rw, ro, md and od regions are linearly allocated, starting from
96 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions
97 // are page-aligned, and there's no gap between any consecutive regions.
98 //
99 // These 5 regions are populated in the following steps:
100 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
101 // temporarily allocated outside of the shared regions. Only the method entry
102 // trampolines are written into the mc region.
103 // [2] ArchiveCompactor copies RW metadata into the rw region.
104 // [3] ArchiveCompactor copies RO metadata into the ro region.
105 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
106 // are copied into the ro region as read-only tables.
107 // [5] C++ vtables are copied into the md region.
108 // [6] Original class files are copied into the od region.
109 //
110 // The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects.
111 // Their layout is independent of the other 5 regions.
112
113 class DumpRegion {
114 private:
115 const char* _name;
116 char* _base;
117 char* _top;
118 char* _end;
119 bool _is_packed;
120
121 char* expand_top_to(char* newtop) {
122 assert(is_allocatable(), "must be initialized and not packed");
123 assert(newtop >= _top, "must not grow backwards");
124 if (newtop > _end) {
125 MetaspaceShared::report_out_of_space(_name, newtop - _top);
126 ShouldNotReachHere();
127 }
128 MetaspaceShared::commit_shared_space_to(newtop);
129 _top = newtop;
130 return _top;
131 }
132
133 public:
134 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {}
135
136 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) {
137 char* p = (char*)align_up(_top, alignment);
138 char* newtop = p + align_up(num_bytes, alignment);
139 expand_top_to(newtop);
140 memset(p, 0, newtop - p);
141 return p;
142 }
143
144 void append_intptr_t(intptr_t n) {
145 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
146 intptr_t *p = (intptr_t*)_top;
147 char* newtop = _top + sizeof(intptr_t);
148 expand_top_to(newtop);
149 *p = n;
150 }
151
152 char* base() const { return _base; }
153 char* top() const { return _top; }
154 char* end() const { return _end; }
155 size_t reserved() const { return _end - _base; }
156 size_t used() const { return _top - _base; }
157 bool is_packed() const { return _is_packed; }
158 bool is_allocatable() const {
159 return !is_packed() && _base != NULL;
160 }
161
162 void print(size_t total_bytes) const {
163 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,
164 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()), p2i(_base));
165 }
166 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
167 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
168 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
169 if (strcmp(_name, failing_region) == 0) {
170 tty->print_cr(" required = %d", int(needed_bytes));
171 } else {
172 tty->cr();
173 }
174 }
175
176 void init(const ReservedSpace* rs) {
177 _base = _top = rs->base();
178 _end = rs->end();
179 }
180 void init(char* b, char* t, char* e) {
181 _base = b;
182 _top = t;
183 _end = e;
184 }
185
186 void pack(DumpRegion* next = NULL) {
187 assert(!is_packed(), "sanity");
188 _end = (char*)align_up(_top, Metaspace::reserve_alignment());
189 _is_packed = true;
190 if (next != NULL) {
191 next->_base = next->_top = this->_end;
192 next->_end = MetaspaceShared::shared_rs()->end();
193 }
194 }
195 bool contains(char* p) {
196 return base() <= p && p < top();
197 }
198 };
199
200
201 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od");
202 size_t _total_string_region_size = 0, _total_open_archive_region_size = 0;
203
204 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
205 return _mc_region.allocate(num_bytes);
206 }
207
208 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
209 return _ro_region.allocate(num_bytes);
210 }
211
212 char* MetaspaceShared::read_only_space_top() {
213 return _ro_region.top();
214 }
215
216 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
217 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
218
219 // If using shared space, open the file that contains the shared space
220 // and map in the memory before initializing the rest of metaspace (so
221 // the addresses don't conflict)
222 address cds_address = NULL;
223 FileMapInfo* mapinfo = new FileMapInfo();
224
225 // Open the shared archive file, read and validate the header. If
226 // initialization fails, shared spaces [UseSharedSpaces] are
227 // disabled and the file is closed.
228 // Map in spaces now also
229 if (mapinfo->initialize() && map_shared_spaces(mapinfo)) {
230 size_t cds_total = core_spaces_size();
231 cds_address = (address)mapinfo->header()->region_addr(0);
232 #ifdef _LP64
233 if (Metaspace::using_class_space()) {
234 char* cds_end = (char*)(cds_address + cds_total);
235 cds_end = (char *)align_up(cds_end, Metaspace::reserve_alignment());
236 // If UseCompressedClassPointers is set then allocate the metaspace area
237 // above the heap and above the CDS area (if it exists).
238 Metaspace::allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
239 // map_heap_regions() compares the current narrow oop and klass encodings
240 // with the archived ones, so it must be done after all encodings are determined.
241 mapinfo->map_heap_regions();
242 }
243 Universe::set_narrow_klass_range(CompressedClassSpaceSize);
244 #endif // _LP64
245 } else {
246 assert(!mapinfo->is_open() && !UseSharedSpaces,
247 "archive file not closed or shared spaces not disabled.");
248 }
249 }
250
251 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() {
252 assert(DumpSharedSpaces, "should be called for dump time only");
253 const size_t reserve_alignment = Metaspace::reserve_alignment();
254 bool large_pages = false; // No large pages when dumping the CDS archive.
255 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment);
256
257 #ifdef _LP64
258 // On 64-bit VM, the heap and class space layout will be the same as if
259 // you're running in -Xshare:on mode:
260 //
261 // +-- SharedBaseAddress (default = 0x800000000)
262 // v
263 // +-..---------+---------+ ... +----+----+----+----+----+---------------+
264 // | Heap | Archive | | MC | RW | RO | MD | OD | class space |
265 // +-..---------+---------+ ... +----+----+----+----+----+---------------+
266 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB ------->|
267 //
268 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
269 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
270 #else
271 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space.
272 size_t cds_total = align_down(256*M, reserve_alignment);
273 #endif
274
275 // First try to reserve the space at the specified SharedBaseAddress.
276 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base);
277 if (_shared_rs.is_reserved()) {
278 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match");
279 } else {
280 // Get a mmap region anywhere if the SharedBaseAddress fails.
281 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages);
282 }
283 if (!_shared_rs.is_reserved()) {
284 vm_exit_during_initialization("Unable to reserve memory for shared space",
285 err_msg(SIZE_FORMAT " bytes.", cds_total));
286 }
287
288 #ifdef _LP64
289 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up:
290 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes()
291 // will store Klasses into this space.
292 // + The lower 3 GB is used for the archive -- when preload_classes() is done,
293 // ArchiveCompactor will copy the class metadata into this space, first the RW parts,
294 // then the RO parts.
295
296 assert(UseCompressedOops && UseCompressedClassPointers,
297 "UseCompressedOops and UseCompressedClassPointers must be set");
298
299 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment);
300 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size);
301 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment);
302 _shared_rs = _shared_rs.first_part(max_archive_size);
303
304 // Set up compress class pointers.
305 Universe::set_narrow_klass_base((address)_shared_rs.base());
306 // Set narrow_klass_shift to be LogKlassAlignmentInBytes. This is consistent
307 // with AOT.
308 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
309 // Set the range of klass addresses to 4GB.
310 Universe::set_narrow_klass_range(cds_total);
311
312 Metaspace::initialize_class_space(tmp_class_space);
313 log_info(cds)("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
314 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
315
316 log_info(cds)("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
317 CompressedClassSpaceSize, p2i(tmp_class_space.base()));
318 #endif
319
320 // Start with 0 committed bytes. The memory will be committed as needed by
321 // MetaspaceShared::commit_shared_space_to().
322 if (!_shared_vs.initialize(_shared_rs, 0)) {
323 vm_exit_during_initialization("Unable to allocate memory for shared space");
324 }
325
326 _mc_region.init(&_shared_rs);
327 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
328 _shared_rs.size(), p2i(_shared_rs.base()));
329 }
330
331 // Called by universe_post_init()
332 void MetaspaceShared::post_initialize(TRAPS) {
333 if (UseSharedSpaces) {
334 int size = FileMapInfo::get_number_of_shared_paths();
335 if (size > 0) {
336 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD);
337 FileMapInfo::FileMapHeader* header = FileMapInfo::current_info()->header();
338 ClassLoaderExt::init_paths_start_index(header->_app_class_paths_start_index);
339 ClassLoaderExt::init_app_module_paths_start_index(header->_app_module_paths_start_index);
340 }
341 }
342
343 if (DumpSharedSpaces) {
344 if (SharedArchiveConfigFile) {
345 read_extra_data(SharedArchiveConfigFile, THREAD);
346 }
347 }
348 }
349
350 void MetaspaceShared::read_extra_data(const char* filename, TRAPS) {
351 HashtableTextDump reader(filename);
352 reader.check_version("VERSION: 1.0");
353
354 while (reader.remain() > 0) {
355 int utf8_length;
356 int prefix_type = reader.scan_prefix(&utf8_length);
357 ResourceMark rm(THREAD);
358 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, utf8_length);
359 reader.get_utf8(utf8_buffer, utf8_length);
360
361 if (prefix_type == HashtableTextDump::SymbolPrefix) {
362 SymbolTable::new_symbol(utf8_buffer, utf8_length, THREAD);
363 } else{
364 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
365 utf8_buffer[utf8_length] = '\0';
366 oop s = StringTable::intern(utf8_buffer, THREAD);
367 }
368 }
369 }
370
371 void MetaspaceShared::commit_shared_space_to(char* newtop) {
372 assert(DumpSharedSpaces, "dump-time only");
373 char* base = _shared_rs.base();
374 size_t need_committed_size = newtop - base;
375 size_t has_committed_size = _shared_vs.committed_size();
376 if (need_committed_size < has_committed_size) {
377 return;
378 }
379
380 size_t min_bytes = need_committed_size - has_committed_size;
381 size_t preferred_bytes = 1 * M;
382 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size;
383
384 size_t commit = MAX2(min_bytes, preferred_bytes);
385 assert(commit <= uncommitted, "sanity");
386
387 bool result = _shared_vs.expand_by(commit, false);
388 if (!result) {
389 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
390 need_committed_size));
391 }
392
393 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
394 commit, _shared_vs.actual_committed_size(), _shared_vs.high());
395 }
396
397 // Read/write a data stream for restoring/preserving metadata pointers and
398 // miscellaneous data from/to the shared archive file.
399
400 void MetaspaceShared::serialize(SerializeClosure* soc) {
401 int tag = 0;
402 soc->do_tag(--tag);
403
404 // Verify the sizes of various metadata in the system.
405 soc->do_tag(sizeof(Method));
406 soc->do_tag(sizeof(ConstMethod));
407 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
408 soc->do_tag(sizeof(ConstantPool));
409 soc->do_tag(sizeof(ConstantPoolCache));
410 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
411 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
412 soc->do_tag(sizeof(Symbol));
413
414 // Dump/restore miscellaneous metadata.
415 Universe::serialize(soc, true);
416 soc->do_tag(--tag);
417
418 // Dump/restore references to commonly used names and signatures.
419 vmSymbols::serialize(soc);
420 soc->do_tag(--tag);
421
422 // Dump/restore the symbol and string tables
423 SymbolTable::serialize(soc);
424 StringTable::serialize(soc);
425 soc->do_tag(--tag);
426
427 serialize_well_known_classes(soc);
428 soc->do_tag(--tag);
429
430 soc->do_tag(666);
431 }
432
433 void MetaspaceShared::serialize_well_known_classes(SerializeClosure* soc) {
434 java_lang_Class::serialize(soc);
435 java_lang_String::serialize(soc);
436 java_lang_System::serialize(soc);
437 java_lang_ClassLoader::serialize(soc);
438 java_lang_Throwable::serialize(soc);
439 java_lang_Thread::serialize(soc);
440 java_lang_ThreadGroup::serialize(soc);
441 java_lang_AssertionStatusDirectives::serialize(soc);
442 java_lang_module_Configuration::serialize(soc);
443 java_lang_ref_SoftReference::serialize(soc);
444 java_lang_invoke_MethodHandle::serialize(soc);
445 java_lang_invoke_DirectMethodHandle::serialize(soc);
446 java_lang_invoke_MemberName::serialize(soc);
447 java_lang_invoke_ResolvedMethodName::serialize(soc);
448 java_lang_invoke_LambdaForm::serialize(soc);
449 java_lang_invoke_MethodType::serialize(soc);
450 java_lang_invoke_CallSite::serialize(soc);
451 java_lang_invoke_MethodHandleNatives_CallSiteContext::serialize(soc);
452 java_security_AccessControlContext::serialize(soc);
453 java_lang_reflect_AccessibleObject::serialize(soc);
454 java_lang_reflect_Method::serialize(soc);
455 java_lang_reflect_Constructor::serialize(soc);
456 java_lang_reflect_Field::serialize(soc);
457 java_nio_Buffer::serialize(soc);
458 reflect_ConstantPool::serialize(soc);
459 reflect_UnsafeStaticFieldAccessorImpl::serialize(soc);
460 java_lang_reflect_Parameter::serialize(soc);
461 java_lang_Module::serialize(soc);
462 java_lang_StackTraceElement::serialize(soc);
463 java_lang_StackFrameInfo::serialize(soc);
464 java_lang_LiveStackFrameInfo::serialize(soc);
465 java_util_concurrent_locks_AbstractOwnableSynchronizer::serialize(soc);
466 java_util_ImmutableCollections_ListN::serialize(soc);
467 java_util_ImmutableCollections_MapN::serialize(soc);
468 java_util_ImmutableCollections_SetN::serialize(soc);
469 jdk_internal_module_ArchivedModuleGraph::serialize(soc);
470 InstanceMirrorKlass::serialize(soc);
471 }
472
473 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
474 if (DumpSharedSpaces) {
475 if (_cds_i2i_entry_code_buffers == NULL) {
476 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
477 _cds_i2i_entry_code_buffers_size = total_size;
478 }
479 } else if (UseSharedSpaces) {
480 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
481 } else {
482 return NULL;
483 }
484
485 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
486 return _cds_i2i_entry_code_buffers;
487 }
488
489 // CDS code for dumping shared archive.
490
491 // Global object for holding classes that have been loaded. Since this
492 // is run at a safepoint just before exit, this is the entire set of classes.
493 static GrowableArray<Klass*>* _global_klass_objects;
494
495 static void collect_array_classes(Klass* k) {
496 _global_klass_objects->append_if_missing(k);
497 if (k->is_array_klass()) {
498 // Add in the array classes too
499 ArrayKlass* ak = ArrayKlass::cast(k);
500 Klass* h = ak->higher_dimension();
501 if (h != NULL) {
502 h->array_klasses_do(collect_array_classes);
503 }
504 }
505 }
506
507 class CollectClassesClosure : public KlassClosure {
508 void do_klass(Klass* k) {
509 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) {
510 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) {
511 // Mark any class with signers and don't add to the _global_klass_objects
512 k->set_has_signer_and_not_archived();
513 } else {
514 _global_klass_objects->append_if_missing(k);
515 }
516 }
517 if (k->is_array_klass()) {
518 // Add in the array classes too
519 ArrayKlass* ak = ArrayKlass::cast(k);
520 Klass* h = ak->higher_dimension();
521 if (h != NULL) {
522 h->array_klasses_do(collect_array_classes);
523 }
524 }
525 }
526 };
527
528 static void remove_unshareable_in_classes() {
529 for (int i = 0; i < _global_klass_objects->length(); i++) {
530 Klass* k = _global_klass_objects->at(i);
531 if (!k->is_objArray_klass()) {
532 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
533 // on their array classes.
534 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
535 k->remove_unshareable_info();
536 }
537 }
538 }
539
540 static void remove_java_mirror_in_classes() {
541 for (int i = 0; i < _global_klass_objects->length(); i++) {
542 Klass* k = _global_klass_objects->at(i);
543 if (!k->is_objArray_klass()) {
544 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
545 // on their array classes.
546 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
547 k->remove_java_mirror();
548 }
549 }
550 }
551
552 static void clear_basic_type_mirrors() {
553 assert(!MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity");
554 Universe::set_int_mirror(NULL);
555 Universe::set_float_mirror(NULL);
556 Universe::set_double_mirror(NULL);
557 Universe::set_byte_mirror(NULL);
558 Universe::set_bool_mirror(NULL);
559 Universe::set_char_mirror(NULL);
560 Universe::set_long_mirror(NULL);
561 Universe::set_short_mirror(NULL);
562 Universe::set_void_mirror(NULL);
563 }
564
565 static void rewrite_nofast_bytecode(Method* method) {
566 BytecodeStream bcs(method);
567 while (!bcs.is_last_bytecode()) {
568 Bytecodes::Code opcode = bcs.next();
569 switch (opcode) {
570 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
571 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
572 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
573 case Bytecodes::_iload: {
574 if (!bcs.is_wide()) {
575 *bcs.bcp() = Bytecodes::_nofast_iload;
576 }
577 break;
578 }
579 default: break;
580 }
581 }
582 }
583
584 // Walk all methods in the class list to ensure that they won't be modified at
585 // run time. This includes:
586 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
587 // at run time by RewriteBytecodes/RewriteFrequentPairs
588 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
589 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
590 for (int i = 0; i < _global_klass_objects->length(); i++) {
591 Klass* k = _global_klass_objects->at(i);
592 if (k->is_instance_klass()) {
593 InstanceKlass* ik = InstanceKlass::cast(k);
594 for (int i = 0; i < ik->methods()->length(); i++) {
595 Method* m = ik->methods()->at(i);
596 rewrite_nofast_bytecode(m);
597 Fingerprinter fp(m);
598 // The side effect of this call sets method's fingerprint field.
599 fp.fingerprint();
600 }
601 }
602 }
603 }
604
605 static void relocate_cached_class_file() {
606 for (int i = 0; i < _global_klass_objects->length(); i++) {
607 Klass* k = _global_klass_objects->at(i);
608 if (k->is_instance_klass()) {
609 InstanceKlass* ik = InstanceKlass::cast(k);
610 JvmtiCachedClassFileData* p = ik->get_archived_class_data();
611 if (p != NULL) {
612 int size = offset_of(JvmtiCachedClassFileData, data) + p->length;
613 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size);
614 q->length = p->length;
615 memcpy(q->data, p->data, p->length);
616 ik->set_archived_class_data(q);
617 }
618 }
619 }
620 }
621
622 NOT_PRODUCT(
623 static void assert_not_anonymous_class(InstanceKlass* k) {
624 assert(!(k->is_anonymous()), "cannot archive anonymous classes");
625 }
626
627 // Anonymous classes are not stored inside any dictionaries. They are created by
628 // SystemDictionary::parse_stream() with a non-null host_klass.
629 static void assert_no_anonymoys_classes_in_dictionaries() {
630 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class);
631 })
632
633 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
634 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
635 //
636 // Addresses of the vtables and the methods may be different across JVM runs,
637 // if libjvm.so is dynamically loaded at a different base address.
638 //
639 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
640 //
641 // + at dump time: we redirect the _vptr to point to our own vtables inside
642 // the CDS image
643 // + at run time: we clone the actual contents of the vtables from libjvm.so
644 // into our own tables.
645
646 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
647 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
648 f(ConstantPool) \
649 f(InstanceKlass) \
650 f(InstanceClassLoaderKlass) \
651 f(InstanceMirrorKlass) \
652 f(InstanceRefKlass) \
653 f(Method) \
654 f(ObjArrayKlass) \
655 f(TypeArrayKlass)
656
657 class CppVtableInfo {
658 intptr_t _vtable_size;
659 intptr_t _cloned_vtable[1];
660 public:
661 static int num_slots(int vtable_size) {
662 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
663 }
664 int vtable_size() { return int(uintx(_vtable_size)); }
665 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
666 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
667 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
668 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
669 static size_t byte_size(int vtable_size) {
670 CppVtableInfo i;
671 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
672 }
673 };
674
675 template <class T> class CppVtableCloner : public T {
676 static intptr_t* vtable_of(Metadata& m) {
677 return *((intptr_t**)&m);
678 }
679 static CppVtableInfo* _info;
680
681 static int get_vtable_length(const char* name);
682
683 public:
684 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
685 static intptr_t* allocate(const char* name);
686
687 // Clone the vtable to ...
688 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
689
690 static void zero_vtable_clone() {
691 assert(DumpSharedSpaces, "dump-time only");
692 _info->zero();
693 }
694
695 // Switch the vtable pointer to point to the cloned vtable.
696 static void patch(Metadata* obj) {
697 assert(DumpSharedSpaces, "dump-time only");
698 *(void**)obj = (void*)(_info->cloned_vtable());
699 }
700
701 static bool is_valid_shared_object(const T* obj) {
702 intptr_t* vptr = *(intptr_t**)obj;
703 return vptr == _info->cloned_vtable();
704 }
705 };
706
707 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
708
709 template <class T>
710 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
711 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
712 int n = get_vtable_length(name);
713 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
714 _info->set_vtable_size(n);
715
716 intptr_t* p = clone_vtable(name, _info);
717 assert((char*)p == _md_region.top(), "must be");
718
719 return p;
720 }
721
722 template <class T>
723 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
724 if (!DumpSharedSpaces) {
725 assert(_info == 0, "_info is initialized only at dump time");
726 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
727 }
728 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
729 int n = info->vtable_size();
730 intptr_t* srcvtable = vtable_of(tmp);
731 intptr_t* dstvtable = info->cloned_vtable();
732
733 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
734 // safe to do memcpy.
735 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
736 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
737 return dstvtable + n;
738 }
739
740 // To determine the size of the vtable for each type, we use the following
741 // trick by declaring 2 subclasses:
742 //
743 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
744 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
745 //
746 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
747 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
748 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
749 // - Their last entry is different.
750 //
751 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
752 // and find the first entry that's different.
753 //
754 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
755 // esoteric compilers.
756
757 template <class T> class CppVtableTesterB: public T {
758 public:
759 virtual int last_virtual_method() {return 1;}
760 };
761
762 template <class T> class CppVtableTesterA : public T {
763 public:
764 virtual void* last_virtual_method() {
765 // Make this different than CppVtableTesterB::last_virtual_method so the C++
766 // compiler/linker won't alias the two functions.
767 return NULL;
768 }
769 };
770
771 template <class T>
772 int CppVtableCloner<T>::get_vtable_length(const char* name) {
773 CppVtableTesterA<T> a;
774 CppVtableTesterB<T> b;
775
776 intptr_t* avtable = vtable_of(a);
777 intptr_t* bvtable = vtable_of(b);
778
779 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
780 int vtable_len = 1;
781 for (; ; vtable_len++) {
782 if (avtable[vtable_len] != bvtable[vtable_len]) {
783 break;
784 }
785 }
786 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
787
788 return vtable_len;
789 }
790
791 #define ALLOC_CPP_VTABLE_CLONE(c) \
792 CppVtableCloner<c>::allocate(#c);
793
794 #define CLONE_CPP_VTABLE(c) \
795 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
796
797 #define ZERO_CPP_VTABLE(c) \
798 CppVtableCloner<c>::zero_vtable_clone();
799
800 // This can be called at both dump time and run time.
801 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
802 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
803 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
804 return p;
805 }
806
807 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
808 assert(DumpSharedSpaces, "dump-time only");
809 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
810 }
811
812 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
813 void MetaspaceShared::allocate_cpp_vtable_clones() {
814 assert(DumpSharedSpaces, "dump-time only");
815 // Layout (each slot is a intptr_t):
816 // [number of slots in the first vtable = n1]
817 // [ <n1> slots for the first vtable]
818 // [number of slots in the first second = n2]
819 // [ <n2> slots for the second vtable]
820 // ...
821 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
822 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
823 }
824
825 // Switch the vtable pointer to point to the cloned vtable. We assume the
826 // vtable pointer is in first slot in object.
827 void MetaspaceShared::patch_cpp_vtable_pointers() {
828 int n = _global_klass_objects->length();
829 for (int i = 0; i < n; i++) {
830 Klass* obj = _global_klass_objects->at(i);
831 if (obj->is_instance_klass()) {
832 InstanceKlass* ik = InstanceKlass::cast(obj);
833 if (ik->is_class_loader_instance_klass()) {
834 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
835 } else if (ik->is_reference_instance_klass()) {
836 CppVtableCloner<InstanceRefKlass>::patch(ik);
837 } else if (ik->is_mirror_instance_klass()) {
838 CppVtableCloner<InstanceMirrorKlass>::patch(ik);
839 } else {
840 CppVtableCloner<InstanceKlass>::patch(ik);
841 }
842 ConstantPool* cp = ik->constants();
843 CppVtableCloner<ConstantPool>::patch(cp);
844 for (int j = 0; j < ik->methods()->length(); j++) {
845 Method* m = ik->methods()->at(j);
846 CppVtableCloner<Method>::patch(m);
847 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
848 }
849 } else if (obj->is_objArray_klass()) {
850 CppVtableCloner<ObjArrayKlass>::patch(obj);
851 } else {
852 assert(obj->is_typeArray_klass(), "sanity");
853 CppVtableCloner<TypeArrayKlass>::patch(obj);
854 }
855 }
856 }
857
858 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
859 assert(is_in_shared_metaspace(m), "must be");
860 return CppVtableCloner<Method>::is_valid_shared_object(m);
861 }
862
863 // Closure for serializing initialization data out to a data area to be
864 // written to the shared file.
865
866 class WriteClosure : public SerializeClosure {
867 private:
868 DumpRegion* _dump_region;
869
870 public:
871 WriteClosure(DumpRegion* r) {
872 _dump_region = r;
873 }
874
875 void do_ptr(void** p) {
876 _dump_region->append_intptr_t((intptr_t)*p);
877 }
878
879 void do_u4(u4* p) {
880 void* ptr = (void*)(uintx(*p));
881 do_ptr(&ptr);
882 }
883
884 void do_tag(int tag) {
885 _dump_region->append_intptr_t((intptr_t)tag);
886 }
887
888 void do_oop(oop* o) {
889 if (*o == NULL) {
890 _dump_region->append_intptr_t(0);
891 } else {
892 assert(MetaspaceShared::is_heap_object_archiving_allowed(),
893 "Archiving heap object is not allowed");
894 _dump_region->append_intptr_t(
895 (intptr_t)CompressedOops::encode_not_null(*o));
896 }
897 }
898
899 void do_region(u_char* start, size_t size) {
900 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
901 assert(size % sizeof(intptr_t) == 0, "bad size");
902 do_tag((int)size);
903 while (size > 0) {
904 _dump_region->append_intptr_t(*(intptr_t*)start);
905 start += sizeof(intptr_t);
906 size -= sizeof(intptr_t);
907 }
908 }
909
910 bool reading() const { return false; }
911 };
912
913 // This is for dumping detailed statistics for the allocations
914 // in the shared spaces.
915 class DumpAllocStats : public ResourceObj {
916 public:
917
918 // Here's poor man's enum inheritance
919 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
920 METASPACE_OBJ_TYPES_DO(f) \
921 f(SymbolHashentry) \
922 f(SymbolBucket) \
923 f(StringHashentry) \
924 f(StringBucket) \
925 f(Other)
926
927 enum Type {
928 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
929 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
930 _number_of_types
931 };
932
933 static const char * type_name(Type type) {
934 switch(type) {
935 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
936 default:
937 ShouldNotReachHere();
938 return NULL;
939 }
940 }
941
942 public:
943 enum { RO = 0, RW = 1 };
944
945 int _counts[2][_number_of_types];
946 int _bytes [2][_number_of_types];
947
948 DumpAllocStats() {
949 memset(_counts, 0, sizeof(_counts));
950 memset(_bytes, 0, sizeof(_bytes));
951 };
952
953 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
954 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
955 int which = (read_only) ? RO : RW;
956 _counts[which][type] ++;
957 _bytes [which][type] += byte_size;
958 }
959
960 void record_other_type(int byte_size, bool read_only) {
961 int which = (read_only) ? RO : RW;
962 _bytes [which][OtherType] += byte_size;
963 }
964 void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
965 };
966
967 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
968 // Calculate size of data that was not allocated by Metaspace::allocate()
969 MetaspaceSharedStats *stats = MetaspaceShared::stats();
970
971 // symbols
972 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
973 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
974
975 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
976 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
977
978 // strings
979 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
980 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
981
982 _counts[RO][StringBucketType] = stats->string.bucket_count;
983 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
984
985 // TODO: count things like dictionary, vtable, etc
986 _bytes[RW][OtherType] += mc_all + md_all;
987 rw_all += mc_all + md_all; // mc/md are mapped Read/Write
988
989 // prevent divide-by-zero
990 if (ro_all < 1) {
991 ro_all = 1;
992 }
993 if (rw_all < 1) {
994 rw_all = 1;
995 }
996
997 int all_ro_count = 0;
998 int all_ro_bytes = 0;
999 int all_rw_count = 0;
1000 int all_rw_bytes = 0;
1001
1002 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
1003 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
1004 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
1005 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
1006
1007 LogMessage(cds) msg;
1008
1009 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
1010 msg.info("%s", hdr);
1011 msg.info("%s", sep);
1012 for (int type = 0; type < int(_number_of_types); type ++) {
1013 const char *name = type_name((Type)type);
1014 int ro_count = _counts[RO][type];
1015 int ro_bytes = _bytes [RO][type];
1016 int rw_count = _counts[RW][type];
1017 int rw_bytes = _bytes [RW][type];
1018 int count = ro_count + rw_count;
1019 int bytes = ro_bytes + rw_bytes;
1020
1021 double ro_perc = percent_of(ro_bytes, ro_all);
1022 double rw_perc = percent_of(rw_bytes, rw_all);
1023 double perc = percent_of(bytes, ro_all + rw_all);
1024
1025 msg.info(fmt_stats, name,
1026 ro_count, ro_bytes, ro_perc,
1027 rw_count, rw_bytes, rw_perc,
1028 count, bytes, perc);
1029
1030 all_ro_count += ro_count;
1031 all_ro_bytes += ro_bytes;
1032 all_rw_count += rw_count;
1033 all_rw_bytes += rw_bytes;
1034 }
1035
1036 int all_count = all_ro_count + all_rw_count;
1037 int all_bytes = all_ro_bytes + all_rw_bytes;
1038
1039 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1040 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1041 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1042
1043 msg.info("%s", sep);
1044 msg.info(fmt_stats, "Total",
1045 all_ro_count, all_ro_bytes, all_ro_perc,
1046 all_rw_count, all_rw_bytes, all_rw_perc,
1047 all_count, all_bytes, all_perc);
1048
1049 assert(all_ro_bytes == ro_all, "everything should have been counted");
1050 assert(all_rw_bytes == rw_all, "everything should have been counted");
1051
1052 #undef fmt_stats
1053 }
1054
1055 // Populate the shared space.
1056
1057 class VM_PopulateDumpSharedSpace: public VM_Operation {
1058 private:
1059 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1060 GrowableArray<MemRegion> *_open_archive_heap_regions;
1061
1062 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
1063 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
1064
1065 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1066 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
1067 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1068 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
1069 void dump_symbols();
1070 char* dump_read_only_tables();
1071 void print_region_stats();
1072 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1073 const char *name, const size_t total_size);
1074 public:
1075
1076 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1077 void doit(); // outline because gdb sucks
1078 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
1079 bool allow_nested_vm_operations() const { return true; }
1080 }; // class VM_PopulateDumpSharedSpace
1081
1082 class SortedSymbolClosure: public SymbolClosure {
1083 GrowableArray<Symbol*> _symbols;
1084 virtual void do_symbol(Symbol** sym) {
1085 assert((*sym)->is_permanent(), "archived symbols must be permanent");
1086 _symbols.append(*sym);
1087 }
1088 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
1089 if (a[0] < b[0]) {
1090 return -1;
1091 } else if (a[0] == b[0]) {
1092 return 0;
1093 } else {
1094 return 1;
1095 }
1096 }
1097
1098 public:
1099 SortedSymbolClosure() {
1100 SymbolTable::symbols_do(this);
1101 _symbols.sort(compare_symbols_by_address);
1102 }
1103 GrowableArray<Symbol*>* get_sorted_symbols() {
1104 return &_symbols;
1105 }
1106 };
1107
1108 // ArchiveCompactor --
1109 //
1110 // This class is the central piece of shared archive compaction -- all metaspace data are
1111 // initially allocated outside of the shared regions. ArchiveCompactor copies the
1112 // metaspace data into their final location in the shared regions.
1113
1114 class ArchiveCompactor : AllStatic {
1115 static DumpAllocStats* _alloc_stats;
1116 static SortedSymbolClosure* _ssc;
1117
1118 static unsigned my_hash(const address& a) {
1119 return primitive_hash<address>(a);
1120 }
1121 static bool my_equals(const address& a0, const address& a1) {
1122 return primitive_equals<address>(a0, a1);
1123 }
1124 typedef ResourceHashtable<
1125 address, address,
1126 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address>
1127 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address>
1128 16384, ResourceObj::C_HEAP> RelocationTable;
1129 static RelocationTable* _new_loc_table;
1130
1131 public:
1132 static void initialize() {
1133 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1134 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable;
1135 }
1136 static DumpAllocStats* alloc_stats() {
1137 return _alloc_stats;
1138 }
1139
1140 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1141 address obj = ref->obj();
1142 int bytes = ref->size() * BytesPerWord;
1143 char* p;
1144 size_t alignment = BytesPerWord;
1145 char* oldtop;
1146 char* newtop;
1147
1148 if (read_only) {
1149 oldtop = _ro_region.top();
1150 p = _ro_region.allocate(bytes, alignment);
1151 newtop = _ro_region.top();
1152 } else {
1153 oldtop = _rw_region.top();
1154 p = _rw_region.allocate(bytes, alignment);
1155 newtop = _rw_region.top();
1156 }
1157 memcpy(p, obj, bytes);
1158 bool isnew = _new_loc_table->put(obj, (address)p);
1159 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1160 assert(isnew, "must be");
1161
1162 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1163 if (ref->msotype() == MetaspaceObj::SymbolType) {
1164 uintx delta = MetaspaceShared::object_delta(p);
1165 if (delta > MAX_SHARED_DELTA) {
1166 // This is just a sanity check and should not appear in any real world usage. This
1167 // happens only if you allocate more than 2GB of Symbols and would require
1168 // millions of shared classes.
1169 vm_exit_during_initialization("Too many Symbols in the CDS archive",
1170 "Please reduce the number of shared classes.");
1171 }
1172 }
1173 }
1174
1175 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1176 address* pp = _new_loc_table->get(ref->obj());
1177 assert(pp != NULL, "must be");
1178 return *pp;
1179 }
1180
1181 private:
1182 // Makes a shallow copy of visited MetaspaceObj's
1183 class ShallowCopier: public UniqueMetaspaceClosure {
1184 bool _read_only;
1185 public:
1186 ShallowCopier(bool read_only) : _read_only(read_only) {}
1187
1188 virtual void do_unique_ref(Ref* ref, bool read_only) {
1189 if (read_only == _read_only) {
1190 allocate(ref, read_only);
1191 }
1192 }
1193 };
1194
1195 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1196 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1197 public:
1198 virtual void do_unique_ref(Ref* ref, bool read_only) {
1199 address new_loc = get_new_loc(ref);
1200 RefRelocator refer;
1201 ref->metaspace_pointers_do_at(&refer, new_loc);
1202 }
1203 };
1204
1205 // Relocate a reference to point to its shallow copy
1206 class RefRelocator: public MetaspaceClosure {
1207 public:
1208 virtual bool do_ref(Ref* ref, bool read_only) {
1209 if (ref->not_null()) {
1210 ref->update(get_new_loc(ref));
1211 }
1212 return false; // Do not recurse.
1213 }
1214 };
1215
1216 #ifdef ASSERT
1217 class IsRefInArchiveChecker: public MetaspaceClosure {
1218 public:
1219 virtual bool do_ref(Ref* ref, bool read_only) {
1220 if (ref->not_null()) {
1221 char* obj = (char*)ref->obj();
1222 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1223 "must be relocated to point to CDS archive");
1224 }
1225 return false; // Do not recurse.
1226 }
1227 };
1228 #endif
1229
1230 public:
1231 static void copy_and_compact() {
1232 // We should no longer allocate anything from the metaspace, so that
1233 // we can have a stable set of MetaspaceObjs to work with.
1234 Metaspace::freeze();
1235
1236 ResourceMark rm;
1237 SortedSymbolClosure the_ssc; // StackObj
1238 _ssc = &the_ssc;
1239
1240 tty->print_cr("Scanning all metaspace objects ... ");
1241 {
1242 // allocate and shallow-copy RW objects, immediately following the MC region
1243 tty->print_cr("Allocating RW objects ... ");
1244 _mc_region.pack(&_rw_region);
1245
1246 ResourceMark rm;
1247 ShallowCopier rw_copier(false);
1248 iterate_roots(&rw_copier);
1249 }
1250 {
1251 // allocate and shallow-copy of RO object, immediately following the RW region
1252 tty->print_cr("Allocating RO objects ... ");
1253 _rw_region.pack(&_ro_region);
1254
1255 ResourceMark rm;
1256 ShallowCopier ro_copier(true);
1257 iterate_roots(&ro_copier);
1258 }
1259 {
1260 tty->print_cr("Relocating embedded pointers ... ");
1261 ResourceMark rm;
1262 ShallowCopyEmbeddedRefRelocator emb_reloc;
1263 iterate_roots(&emb_reloc);
1264 }
1265 {
1266 tty->print_cr("Relocating external roots ... ");
1267 ResourceMark rm;
1268 RefRelocator ext_reloc;
1269 iterate_roots(&ext_reloc);
1270 }
1271
1272 #ifdef ASSERT
1273 {
1274 tty->print_cr("Verifying external roots ... ");
1275 ResourceMark rm;
1276 IsRefInArchiveChecker checker;
1277 iterate_roots(&checker);
1278 }
1279 #endif
1280
1281
1282 // cleanup
1283 _ssc = NULL;
1284 }
1285
1286 // We must relocate the System::_well_known_klasses only after we have copied the
1287 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1288 // old objects which assert that their klass is the original klass.
1289 static void relocate_well_known_klasses() {
1290 {
1291 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
1292 ResourceMark rm;
1293 RefRelocator ext_reloc;
1294 SystemDictionary::well_known_klasses_do(&ext_reloc);
1295 }
1296 // NOTE: after this point, we shouldn't have any globals that can reach the old
1297 // objects.
1298
1299 // We cannot use any of the objects in the heap anymore (except for the objects
1300 // in the CDS shared string regions) because their headers no longer point to
1301 // valid Klasses.
1302 }
1303
1304 static void iterate_roots(MetaspaceClosure* it) {
1305 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
1306 for (int i=0; i<symbols->length(); i++) {
1307 it->push(symbols->adr_at(i));
1308 }
1309 if (_global_klass_objects != NULL) {
1310 // Need to fix up the pointers
1311 for (int i = 0; i < _global_klass_objects->length(); i++) {
1312 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1313 it->push(_global_klass_objects->adr_at(i));
1314 }
1315 }
1316 FileMapInfo::metaspace_pointers_do(it);
1317 SystemDictionary::classes_do(it);
1318 Universe::metaspace_pointers_do(it);
1319 SymbolTable::metaspace_pointers_do(it);
1320 vmSymbols::metaspace_pointers_do(it);
1321 }
1322
1323 static Klass* get_relocated_klass(Klass* orig_klass) {
1324 assert(DumpSharedSpaces, "dump time only");
1325 address* pp = _new_loc_table->get((address)orig_klass);
1326 assert(pp != NULL, "must be");
1327 Klass* klass = (Klass*)(*pp);
1328 assert(klass->is_klass(), "must be");
1329 return klass;
1330 }
1331 };
1332
1333 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1334 SortedSymbolClosure* ArchiveCompactor::_ssc;
1335 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1336
1337 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
1338 DumpRegion* dump_region, bool read_only, bool allow_exec) {
1339 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1340 }
1341
1342 void VM_PopulateDumpSharedSpace::dump_symbols() {
1343 tty->print_cr("Dumping symbol table ...");
1344
1345 NOT_PRODUCT(SymbolTable::verify());
1346 SymbolTable::write_to_archive();
1347 }
1348
1349 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1350 char* oldtop = _ro_region.top();
1351 // Reorder the system dictionary. Moving the symbols affects
1352 // how the hash table indices are calculated.
1353 SystemDictionary::reorder_dictionary_for_sharing();
1354
1355 tty->print("Removing java_mirror ... ");
1356 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
1357 clear_basic_type_mirrors();
1358 }
1359 remove_java_mirror_in_classes();
1360 tty->print_cr("done. ");
1361 NOT_PRODUCT(SystemDictionary::verify();)
1362
1363 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets();
1364 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t));
1365 SystemDictionary::copy_buckets(buckets_top, _ro_region.top());
1366
1367 size_t table_bytes = SystemDictionary::count_bytes_for_table();
1368 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t));
1369 SystemDictionary::copy_table(table_top, _ro_region.top());
1370
1371 // Write the archived object sub-graph infos. For each klass with sub-graphs,
1372 // the info includes the static fields (sub-graph entry points) and Klasses
1373 // of objects included in the sub-graph.
1374 HeapShared::write_archived_subgraph_infos();
1375
1376 // Write the other data to the output array.
1377 WriteClosure wc(&_ro_region);
1378 MetaspaceShared::serialize(&wc);
1379
1380 // Write the bitmaps for patching the archive heap regions
1381 dump_archive_heap_oopmaps();
1382
1383 char* newtop = _ro_region.top();
1384 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true);
1385 return buckets_top;
1386 }
1387
1388 void VM_PopulateDumpSharedSpace::doit() {
1389 Thread* THREAD = VMThread::vm_thread();
1390
1391 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1392
1393 NOT_PRODUCT(SystemDictionary::verify();)
1394 // The following guarantee is meant to ensure that no loader constraints
1395 // exist yet, since the constraints table is not shared. This becomes
1396 // more important now that we don't re-initialize vtables/itables for
1397 // shared classes at runtime, where constraints were previously created.
1398 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1399 "loader constraints are not saved");
1400 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1401 "placeholders are not saved");
1402 // Revisit and implement this if we prelink method handle call sites:
1403 guarantee(SystemDictionary::invoke_method_table() == NULL ||
1404 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
1405 "invoke method table is not saved");
1406
1407 // At this point, many classes have been loaded.
1408 // Gather systemDictionary classes in a global array and do everything to
1409 // that so we don't have to walk the SystemDictionary again.
1410 _global_klass_objects = new GrowableArray<Klass*>(1000);
1411 CollectClassesClosure collect_classes;
1412 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1413
1414 tty->print_cr("Number of classes %d", _global_klass_objects->length());
1415 {
1416 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1417 for (int i = 0; i < _global_klass_objects->length(); i++) {
1418 Klass* k = _global_klass_objects->at(i);
1419 if (k->is_instance_klass()) {
1420 num_inst ++;
1421 } else if (k->is_objArray_klass()) {
1422 num_obj_array ++;
1423 } else {
1424 assert(k->is_typeArray_klass(), "sanity");
1425 num_type_array ++;
1426 }
1427 }
1428 tty->print_cr(" instance classes = %5d", num_inst);
1429 tty->print_cr(" obj array classes = %5d", num_obj_array);
1430 tty->print_cr(" type array classes = %5d", num_type_array);
1431 }
1432
1433 // Ensure the ConstMethods won't be modified at run-time
1434 tty->print("Updating ConstMethods ... ");
1435 rewrite_nofast_bytecodes_and_calculate_fingerprints();
1436 tty->print_cr("done. ");
1437
1438 // Move classes from platform/system dictionaries into the boot dictionary
1439 SystemDictionary::combine_shared_dictionaries();
1440
1441 // Make sure all classes have a correct loader type.
1442 ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(MetaspaceShared::check_shared_class_loader_type);
1443
1444 // Remove all references outside the metadata
1445 tty->print("Removing unshareable information ... ");
1446 remove_unshareable_in_classes();
1447 tty->print_cr("done. ");
1448
1449 // We don't support archiving anonymous classes. Verify that they are not stored in
1450 // the any dictionaries.
1451 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries());
1452
1453 SystemDictionaryShared::finalize_verification_constraints();
1454
1455 ArchiveCompactor::initialize();
1456 ArchiveCompactor::copy_and_compact();
1457
1458 dump_symbols();
1459
1460 // Dump supported java heap objects
1461 _closed_archive_heap_regions = NULL;
1462 _open_archive_heap_regions = NULL;
1463 dump_java_heap_objects();
1464
1465 ArchiveCompactor::relocate_well_known_klasses();
1466
1467 char* read_only_tables_start = dump_read_only_tables();
1468 _ro_region.pack(&_md_region);
1469
1470 char* vtbl_list = _md_region.top();
1471 MetaspaceShared::allocate_cpp_vtable_clones();
1472 _md_region.pack(&_od_region);
1473
1474 // Relocate the archived class file data into the od region
1475 relocate_cached_class_file();
1476 _od_region.pack();
1477
1478 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size
1479 // is just the spaces between the two ends.
1480 size_t core_spaces_size = _od_region.end() - _mc_region.base();
1481 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
1482 "should already be aligned");
1483
1484 // During patching, some virtual methods may be called, so at this point
1485 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
1486 MetaspaceShared::patch_cpp_vtable_pointers();
1487
1488 // The vtable clones contain addresses of the current process.
1489 // We don't want to write these addresses into the archive.
1490 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1491
1492 // Create and write the archive file that maps the shared spaces.
1493
1494 FileMapInfo* mapinfo = new FileMapInfo();
1495 mapinfo->populate_header(os::vm_allocation_granularity());
1496 mapinfo->set_read_only_tables_start(read_only_tables_start);
1497 mapinfo->set_misc_data_patching_start(vtbl_list);
1498 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
1499 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
1500 mapinfo->set_core_spaces_size(core_spaces_size);
1501
1502 for (int pass=1; pass<=2; pass++) {
1503 if (pass == 1) {
1504 // The first pass doesn't actually write the data to disk. All it
1505 // does is to update the fields in the mapinfo->_header.
1506 } else {
1507 // After the first pass, the contents of mapinfo->_header are finalized,
1508 // so we can compute the header's CRC, and write the contents of the header
1509 // and the regions into disk.
1510 mapinfo->open_for_write();
1511 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1512 }
1513 mapinfo->write_header();
1514
1515 // NOTE: md contains the trampoline code for method entries, which are patched at run time,
1516 // so it needs to be read/write.
1517 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1518 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1519 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1520 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
1521 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false);
1522
1523 _total_string_region_size = mapinfo->write_archive_heap_regions(
1524 _closed_archive_heap_regions,
1525 _closed_archive_heap_oopmaps,
1526 MetaspaceShared::first_string,
1527 MetaspaceShared::max_strings);
1528 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1529 _open_archive_heap_regions,
1530 _open_archive_heap_oopmaps,
1531 MetaspaceShared::first_open_archive_heap_region,
1532 MetaspaceShared::max_open_archive_heap_region);
1533 }
1534
1535 mapinfo->close();
1536
1537 // Restore the vtable in case we invoke any virtual methods.
1538 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
1539
1540 print_region_stats();
1541
1542 if (log_is_enabled(Info, cds)) {
1543 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1544 int(_mc_region.used()), int(_md_region.used()));
1545 }
1546
1547 if (PrintSystemDictionaryAtExit) {
1548 SystemDictionary::print();
1549 }
1550 // There may be other pending VM operations that operate on the InstanceKlasses,
1551 // which will fail because InstanceKlasses::remove_unshareable_info()
1552 // has been called. Forget these operations and exit the VM directly.
1553 vm_direct_exit(0);
1554 }
1555
1556 void VM_PopulateDumpSharedSpace::print_region_stats() {
1557 // Print statistics of all the regions
1558 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1559 _mc_region.reserved() + _md_region.reserved() +
1560 _od_region.reserved() +
1561 _total_string_region_size +
1562 _total_open_archive_region_size;
1563 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1564 _mc_region.used() + _md_region.used() +
1565 _od_region.used() +
1566 _total_string_region_size +
1567 _total_open_archive_region_size;
1568 const double total_u_perc = percent_of(total_bytes, total_reserved);
1569
1570 _mc_region.print(total_reserved);
1571 _rw_region.print(total_reserved);
1572 _ro_region.print(total_reserved);
1573 _md_region.print(total_reserved);
1574 _od_region.print(total_reserved);
1575 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved);
1576 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1577
1578 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1579 total_bytes, total_reserved, total_u_perc);
1580 }
1581
1582 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1583 const char *name, const size_t total_size) {
1584 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1585 for (int i = 0; i < arr_len; i++) {
1586 char* start = (char*)heap_mem->at(i).start();
1587 size_t size = heap_mem->at(i).byte_size();
1588 char* top = start + size;
1589 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,
1590 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1591
1592 }
1593 }
1594
1595 // Update a Java object to point its Klass* to the new location after
1596 // shared archive has been compacted.
1597 void MetaspaceShared::relocate_klass_ptr(oop o) {
1598 assert(DumpSharedSpaces, "sanity");
1599 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1600 o->set_klass(k);
1601 }
1602
1603 Klass* MetaspaceShared::get_relocated_klass(Klass *k) {
1604 assert(DumpSharedSpaces, "sanity");
1605 return ArchiveCompactor::get_relocated_klass(k);
1606 }
1607
1608 class LinkSharedClassesClosure : public KlassClosure {
1609 Thread* THREAD;
1610 bool _made_progress;
1611 public:
1612 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1613
1614 void reset() { _made_progress = false; }
1615 bool made_progress() const { return _made_progress; }
1616
1617 void do_klass(Klass* k) {
1618 if (k->is_instance_klass()) {
1619 InstanceKlass* ik = InstanceKlass::cast(k);
1620 // Link the class to cause the bytecodes to be rewritten and the
1621 // cpcache to be created. Class verification is done according
1622 // to -Xverify setting.
1623 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1624 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1625
1626 ik->constants()->resolve_class_constants(THREAD);
1627 }
1628 }
1629 };
1630
1631 class CheckSharedClassesClosure : public KlassClosure {
1632 bool _made_progress;
1633 public:
1634 CheckSharedClassesClosure() : _made_progress(false) {}
1635
1636 void reset() { _made_progress = false; }
1637 bool made_progress() const { return _made_progress; }
1638 void do_klass(Klass* k) {
1639 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
1640 _made_progress = true;
1641 }
1642 }
1643 };
1644
1645 void MetaspaceShared::check_shared_class_loader_type(InstanceKlass* ik) {
1646 ResourceMark rm;
1647 if (ik->shared_classpath_index() == UNREGISTERED_INDEX) {
1648 guarantee(ik->loader_type() == 0,
1649 "Class loader type must not be set for this class %s", ik->name()->as_C_string());
1650 } else {
1651 guarantee(ik->loader_type() != 0,
1652 "Class loader type must be set for this class %s", ik->name()->as_C_string());
1653 }
1654 }
1655
1656 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1657 // We need to iterate because verification may cause additional classes
1658 // to be loaded.
1659 LinkSharedClassesClosure link_closure(THREAD);
1660 do {
1661 link_closure.reset();
1662 ClassLoaderDataGraph::loaded_classes_do(&link_closure);
1663 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1664 } while (link_closure.made_progress());
1665
1666 if (_has_error_classes) {
1667 // Mark all classes whose super class or interfaces failed verification.
1668 CheckSharedClassesClosure check_closure;
1669 do {
1670 // Not completely sure if we need to do this iteratively. Anyway,
1671 // we should come here only if there are unverifiable classes, which
1672 // shouldn't happen in normal cases. So better safe than sorry.
1673 check_closure.reset();
1674 ClassLoaderDataGraph::loaded_classes_do(&check_closure);
1675 } while (check_closure.made_progress());
1676
1677 if (IgnoreUnverifiableClassesDuringDump) {
1678 // This is useful when running JCK or SQE tests. You should not
1679 // enable this when running real apps.
1680 SystemDictionary::remove_classes_in_error_state();
1681 } else {
1682 tty->print_cr("Please remove the unverifiable classes from your class list and try again");
1683 exit(1);
1684 }
1685 }
1686 }
1687
1688 void MetaspaceShared::prepare_for_dumping() {
1689 Arguments::check_unsupported_dumping_properties();
1690 ClassLoader::initialize_shared_path();
1691 }
1692
1693 // Preload classes from a list, populate the shared spaces and dump to a
1694 // file.
1695 void MetaspaceShared::preload_and_dump(TRAPS) {
1696 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1697 ResourceMark rm;
1698 char class_list_path_str[JVM_MAXPATHLEN];
1699 // Preload classes to be shared.
1700 // Should use some os:: method rather than fopen() here. aB.
1701 const char* class_list_path;
1702 if (SharedClassListFile == NULL) {
1703 // Construct the path to the class list (in jre/lib)
1704 // Walk up two directories from the location of the VM and
1705 // optionally tack on "lib" (depending on platform)
1706 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1707 for (int i = 0; i < 3; i++) {
1708 char *end = strrchr(class_list_path_str, *os::file_separator());
1709 if (end != NULL) *end = '\0';
1710 }
1711 int class_list_path_len = (int)strlen(class_list_path_str);
1712 if (class_list_path_len >= 3) {
1713 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1714 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1715 jio_snprintf(class_list_path_str + class_list_path_len,
1716 sizeof(class_list_path_str) - class_list_path_len,
1717 "%slib", os::file_separator());
1718 class_list_path_len += 4;
1719 }
1720 }
1721 }
1722 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1723 jio_snprintf(class_list_path_str + class_list_path_len,
1724 sizeof(class_list_path_str) - class_list_path_len,
1725 "%sclasslist", os::file_separator());
1726 }
1727 class_list_path = class_list_path_str;
1728 } else {
1729 class_list_path = SharedClassListFile;
1730 }
1731
1732 tty->print_cr("Loading classes to share ...");
1733 _has_error_classes = false;
1734 int class_count = preload_classes(class_list_path, THREAD);
1735 if (ExtraSharedClassListFile) {
1736 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1737 }
1738 tty->print_cr("Loading classes to share: done.");
1739
1740 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1741
1742 // Rewrite and link classes
1743 tty->print_cr("Rewriting and linking classes ...");
1744
1745 // Link any classes which got missed. This would happen if we have loaded classes that
1746 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1747 // fails verification, all other interfaces that were not specified in the classlist but
1748 // are implemented by K are not verified.
1749 link_and_cleanup_shared_classes(CATCH);
1750 tty->print_cr("Rewriting and linking classes: done");
1751
1752 SystemDictionary::clear_invoke_method_table();
1753
1754 VM_PopulateDumpSharedSpace op;
1755 VMThread::execute(&op);
1756 }
1757 }
1758
1759
1760 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1761 ClassListParser parser(class_list_path);
1762 int class_count = 0;
1763
1764 while (parser.parse_one_line()) {
1765 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
1766 if (HAS_PENDING_EXCEPTION) {
1767 if (klass == NULL &&
1768 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1769 // print a warning only when the pending exception is class not found
1770 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
1771 }
1772 CLEAR_PENDING_EXCEPTION;
1773 }
1774 if (klass != NULL) {
1775 if (log_is_enabled(Trace, cds)) {
1776 ResourceMark rm;
1777 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
1778 }
1779
1780 if (klass->is_instance_klass()) {
1781 InstanceKlass* ik = InstanceKlass::cast(klass);
1782
1783 // Link the class to cause the bytecodes to be rewritten and the
1784 // cpcache to be created. The linking is done as soon as classes
1785 // are loaded in order that the related data structures (klass and
1786 // cpCache) are located together.
1787 try_link_class(ik, THREAD);
1788 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1789 }
1790
1791 class_count++;
1792 }
1793 }
1794
1795 return class_count;
1796 }
1797
1798 // Returns true if the class's status has changed
1799 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
1800 assert(DumpSharedSpaces, "should only be called during dumping");
1801 if (ik->init_state() < InstanceKlass::linked) {
1802 bool saved = BytecodeVerificationLocal;
1803 if (ik->loader_type() == 0 && ik->class_loader() == NULL) {
1804 // The verification decision is based on BytecodeVerificationRemote
1805 // for non-system classes. Since we are using the NULL classloader
1806 // to load non-system classes for customized class loaders during dumping,
1807 // we need to temporarily change BytecodeVerificationLocal to be the same as
1808 // BytecodeVerificationRemote. Note this can cause the parent system
1809 // classes also being verified. The extra overhead is acceptable during
1810 // dumping.
1811 BytecodeVerificationLocal = BytecodeVerificationRemote;
1812 }
1813 ik->link_class(THREAD);
1814 if (HAS_PENDING_EXCEPTION) {
1815 ResourceMark rm;
1816 tty->print_cr("Preload Warning: Verification failed for %s",
1817 ik->external_name());
1818 CLEAR_PENDING_EXCEPTION;
1819 ik->set_in_error_state();
1820 _has_error_classes = true;
1821 }
1822 BytecodeVerificationLocal = saved;
1823 return true;
1824 } else {
1825 return false;
1826 }
1827 }
1828
1829 #if INCLUDE_CDS_JAVA_HEAP
1830 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1831 if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
1832 if (log_is_enabled(Info, cds)) {
1833 log_info(cds)(
1834 "Archived java heap is not supported as UseG1GC, "
1835 "UseCompressedOops and UseCompressedClassPointers are required."
1836 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.",
1837 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
1838 BOOL_TO_STR(UseCompressedClassPointers));
1839 }
1840 return;
1841 }
1842
1843 {
1844 NoSafepointVerifier nsv;
1845
1846 // Cache for recording where the archived objects are copied to
1847 MetaspaceShared::create_archive_object_cache();
1848
1849 tty->print_cr("Dumping objects to closed archive heap region ...");
1850 NOT_PRODUCT(StringTable::verify());
1851 // The closed space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details.
1852 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
1853 MetaspaceShared::dump_closed_archive_heap_objects(_closed_archive_heap_regions);
1854
1855 tty->print_cr("Dumping objects to open archive heap region ...");
1856 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
1857 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions);
1858
1859 MetaspaceShared::destroy_archive_object_cache();
1860 }
1861
1862 G1HeapVerifier::verify_archive_regions();
1863 }
1864
1865 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
1866 if (MetaspaceShared::is_heap_object_archiving_allowed()) {
1867 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1868 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
1869
1870 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1871 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
1872 }
1873 }
1874
1875 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1876 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
1877 for (int i=0; i<regions->length(); i++) {
1878 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
1879 size_t size_in_bits = oopmap.size();
1880 size_t size_in_bytes = oopmap.size_in_bytes();
1881 uintptr_t* buffer = (uintptr_t*)_ro_region.allocate(size_in_bytes, sizeof(intptr_t));
1882 oopmap.write_to(buffer, size_in_bytes);
1883 log_info(cds)("Oopmap = " INTPTR_FORMAT " (%6d bytes) for heap region " INTPTR_FORMAT " (%8d bytes)",
1884 p2i(buffer), (int)(size_in_bytes),
1885 p2i(regions->at(i).start()), (int)regions->at(i).byte_size());
1886
1887 ArchiveHeapOopmapInfo info;
1888 info._oopmap = (address)buffer;
1889 info._oopmap_size_in_bits = size_in_bits;
1890 oopmaps->append(info);
1891 }
1892 }
1893
1894 void MetaspaceShared::dump_closed_archive_heap_objects(
1895 GrowableArray<MemRegion> * closed_archive) {
1896 assert(is_heap_object_archiving_allowed(), "Cannot dump java heap objects");
1897
1898 Thread* THREAD = Thread::current();
1899 G1CollectedHeap::heap()->begin_archive_alloc_range();
1900
1901 // Archive interned string objects
1902 StringTable::write_to_archive();
1903
1904 G1CollectedHeap::heap()->end_archive_alloc_range(closed_archive,
1905 os::vm_allocation_granularity());
1906 }
1907
1908 void MetaspaceShared::dump_open_archive_heap_objects(
1909 GrowableArray<MemRegion> * open_archive) {
1910 assert(UseG1GC, "Only support G1 GC");
1911 assert(UseCompressedOops && UseCompressedClassPointers,
1912 "Only support UseCompressedOops and UseCompressedClassPointers enabled");
1913
1914 Thread* THREAD = Thread::current();
1915 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */);
1916
1917 java_lang_Class::archive_basic_type_mirrors(THREAD);
1918
1919 MetaspaceShared::archive_klass_objects(THREAD);
1920
1921 HeapShared::archive_module_graph_objects(THREAD);
1922
1923 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive,
1924 os::vm_allocation_granularity());
1925 }
1926
1927 unsigned MetaspaceShared::obj_hash(oop const& p) {
1928 assert(!p->mark()->has_bias_pattern(),
1929 "this object should never have been locked"); // so identity_hash won't safepoin
1930 unsigned hash = (unsigned)p->identity_hash();
1931 return hash;
1932 }
1933
1934 MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL;
1935 oop MetaspaceShared::find_archived_heap_object(oop obj) {
1936 assert(DumpSharedSpaces, "dump-time only");
1937 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
1938 oop* p = cache->get(obj);
1939 if (p != NULL) {
1940 return *p;
1941 } else {
1942 return NULL;
1943 }
1944 }
1945
1946 oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) {
1947 assert(DumpSharedSpaces, "dump-time only");
1948
1949 oop ao = find_archived_heap_object(obj);
1950 if (ao != NULL) {
1951 // already archived
1952 return ao;
1953 }
1954
1955 int len = obj->size();
1956 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
1957 return NULL;
1958 }
1959
1960 int hash = obj->identity_hash();
1961 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len);
1962 if (archived_oop != NULL) {
1963 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len);
1964 relocate_klass_ptr(archived_oop);
1965 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
1966 cache->put(obj, archived_oop);
1967 }
1968 log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT,
1969 p2i(obj), p2i(archived_oop));
1970 return archived_oop;
1971 }
1972
1973 oop MetaspaceShared::materialize_archived_object(narrowOop v) {
1974 if (!CompressedOops::is_null(v)) {
1975 oop obj = HeapShared::decode_with_archived_oop_encoding_mode(v);
1976 return G1CollectedHeap::heap()->materialize_archived_object(obj);
1977 }
1978 return NULL;
1979 }
1980
1981 void MetaspaceShared::archive_klass_objects(Thread* THREAD) {
1982 int i;
1983 for (i = 0; i < _global_klass_objects->length(); i++) {
1984 Klass* k = _global_klass_objects->at(i);
1985
1986 // archive mirror object
1987 java_lang_Class::archive_mirror(k, CHECK);
1988
1989 // archive the resolved_referenes array
1990 if (k->is_instance_klass()) {
1991 InstanceKlass* ik = InstanceKlass::cast(k);
1992 ik->constants()->archive_resolved_references(THREAD);
1993 }
1994 }
1995 }
1996
1997 bool MetaspaceShared::is_archive_object(oop p) {
1998 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p);
1999 }
2000
2001 void MetaspaceShared::fixup_mapped_heap_regions() {
2002 FileMapInfo *mapinfo = FileMapInfo::current_info();
2003 mapinfo->fixup_mapped_heap_regions();
2004 }
2005 #endif // INCLUDE_CDS_JAVA_HEAP
2006
2007 // Closure for serializing initialization data in from a data area
2008 // (ptr_array) read from the shared file.
2009
2010 class ReadClosure : public SerializeClosure {
2011 private:
2012 intptr_t** _ptr_array;
2013
2014 inline intptr_t nextPtr() {
2015 return *(*_ptr_array)++;
2016 }
2017
2018 public:
2019 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
2020
2021 void do_ptr(void** p) {
2022 assert(*p == NULL, "initializing previous initialized pointer.");
2023 intptr_t obj = nextPtr();
2024 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
2025 "hit tag while initializing ptrs.");
2026 *p = (void*)obj;
2027 }
2028
2029 void do_u4(u4* p) {
2030 intptr_t obj = nextPtr();
2031 *p = (u4)(uintx(obj));
2032 }
2033
2034 void do_tag(int tag) {
2035 int old_tag;
2036 old_tag = (int)(intptr_t)nextPtr();
2037 // do_int(&old_tag);
2038 assert(tag == old_tag, "old tag doesn't match");
2039 FileMapInfo::assert_mark(tag == old_tag);
2040 }
2041
2042 void do_oop(oop *p) {
2043 narrowOop o = (narrowOop)nextPtr();
2044 if (o == 0 || !MetaspaceShared::open_archive_heap_region_mapped()) {
2045 p = NULL;
2046 } else {
2047 assert(MetaspaceShared::is_heap_object_archiving_allowed(),
2048 "Archived heap object is not allowed");
2049 assert(MetaspaceShared::open_archive_heap_region_mapped(),
2050 "Open archive heap region is not mapped");
2051 *p = HeapShared::decode_with_archived_oop_encoding_mode(o);
2052 }
2053 }
2054
2055 void do_region(u_char* start, size_t size) {
2056 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
2057 assert(size % sizeof(intptr_t) == 0, "bad size");
2058 do_tag((int)size);
2059 while (size > 0) {
2060 *(intptr_t*)start = nextPtr();
2061 start += sizeof(intptr_t);
2062 size -= sizeof(intptr_t);
2063 }
2064 }
2065
2066 bool reading() const { return true; }
2067 };
2068
2069 // Return true if given address is in the misc data region
2070 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
2071 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
2072 }
2073
2074 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
2075 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
2076 return true;
2077 }
2078 return false;
2079 }
2080
2081 // Map shared spaces at requested addresses and return if succeeded.
2082 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
2083 size_t image_alignment = mapinfo->alignment();
2084
2085 #ifndef _WINDOWS
2086 // Map in the shared memory and then map the regions on top of it.
2087 // On Windows, don't map the memory here because it will cause the
2088 // mappings of the regions to fail.
2089 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
2090 if (!shared_rs.is_reserved()) return false;
2091 #endif
2092
2093 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
2094
2095 char* ro_base = NULL; char* ro_top;
2096 char* rw_base = NULL; char* rw_top;
2097 char* mc_base = NULL; char* mc_top;
2098 char* md_base = NULL; char* md_top;
2099 char* od_base = NULL; char* od_top;
2100
2101 // Map each shared region
2102 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL &&
2103 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL &&
2104 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL &&
2105 (md_base = mapinfo->map_region(md, &md_top)) != NULL &&
2106 (od_base = mapinfo->map_region(od, &od_top)) != NULL &&
2107 (image_alignment == (size_t)os::vm_allocation_granularity()) &&
2108 mapinfo->validate_shared_path_table()) {
2109 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for
2110 // fast checking in MetaspaceShared::is_in_shared_metaspace() and
2111 // MetaspaceObj::is_shared().
2112 //
2113 // We require that mc->rw->ro->md->od to be laid out consecutively, with no
2114 // gaps between them. That way, we can ensure that the OS won't be able to
2115 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which
2116 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace().
2117 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be");
2118 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be");
2119 assert(mc_top == rw_base, "must be");
2120 assert(rw_top == ro_base, "must be");
2121 assert(ro_top == md_base, "must be");
2122 assert(md_top == od_base, "must be");
2123
2124 MetaspaceObj::_shared_metaspace_base = (void*)mc_base;
2125 MetaspaceObj::_shared_metaspace_top = (void*)od_top;
2126 return true;
2127 } else {
2128 // If there was a failure in mapping any of the spaces, unmap the ones
2129 // that succeeded
2130 if (ro_base != NULL) mapinfo->unmap_region(ro);
2131 if (rw_base != NULL) mapinfo->unmap_region(rw);
2132 if (mc_base != NULL) mapinfo->unmap_region(mc);
2133 if (md_base != NULL) mapinfo->unmap_region(md);
2134 if (od_base != NULL) mapinfo->unmap_region(od);
2135 #ifndef _WINDOWS
2136 // Release the entire mapped region
2137 shared_rs.release();
2138 #endif
2139 // If -Xshare:on is specified, print out the error message and exit VM,
2140 // otherwise, set UseSharedSpaces to false and continue.
2141 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
2142 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
2143 } else {
2144 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2145 }
2146 return false;
2147 }
2148 }
2149
2150 // Read the miscellaneous data from the shared file, and
2151 // serialize it out to its various destinations.
2152
2153 void MetaspaceShared::initialize_shared_spaces() {
2154 FileMapInfo *mapinfo = FileMapInfo::current_info();
2155 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
2156 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
2157 _core_spaces_size = mapinfo->core_spaces_size();
2158 char* buffer = mapinfo->misc_data_patching_start();
2159 clone_cpp_vtables((intptr_t*)buffer);
2160
2161 // The rest of the data is now stored in the RW region
2162 buffer = mapinfo->read_only_tables_start();
2163 int sharedDictionaryLen = *(intptr_t*)buffer;
2164 buffer += sizeof(intptr_t);
2165 int number_of_entries = *(intptr_t*)buffer;
2166 buffer += sizeof(intptr_t);
2167 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
2168 sharedDictionaryLen,
2169 number_of_entries);
2170 buffer += sharedDictionaryLen;
2171
2172 // The following data are the linked list elements
2173 // (HashtableEntry objects) for the shared dictionary table.
2174
2175 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
2176 buffer += sizeof(intptr_t);
2177 buffer += len;
2178
2179 // The table of archived java heap object sub-graph infos
2180 buffer = HeapShared::read_archived_subgraph_infos(buffer);
2181
2182 // Verify various attributes of the archive, plus initialize the
2183 // shared string/symbol tables
2184 intptr_t* array = (intptr_t*)buffer;
2185 ReadClosure rc(&array);
2186 serialize(&rc);
2187
2188 // Initialize the run-time symbol table.
2189 SymbolTable::create_table();
2190
2191 mapinfo->patch_archived_heap_embedded_pointers();
2192
2193 // Close the mapinfo file
2194 mapinfo->close();
2195
2196 if (PrintSharedArchiveAndExit) {
2197 if (PrintSharedDictionary) {
2198 tty->print_cr("\nShared classes:\n");
2199 SystemDictionary::print_shared(tty);
2200 }
2201 if (_archive_loading_failed) {
2202 tty->print_cr("archive is invalid");
2203 vm_exit(1);
2204 } else {
2205 tty->print_cr("archive is valid");
2206 vm_exit(0);
2207 }
2208 }
2209 }
2210
2211 // JVM/TI RedefineClasses() support:
2212 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2213 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2214
2215 if (UseSharedSpaces) {
2216 // remap the shared readonly space to shared readwrite, private
2217 FileMapInfo* mapinfo = FileMapInfo::current_info();
2218 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2219 return false;
2220 }
2221 _remapped_readwrite = true;
2222 }
2223 return true;
2224 }
2225
2226 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2227 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2228 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2229 // or so.
2230 _mc_region.print_out_of_space_msg(name, needed_bytes);
2231 _rw_region.print_out_of_space_msg(name, needed_bytes);
2232 _ro_region.print_out_of_space_msg(name, needed_bytes);
2233 _md_region.print_out_of_space_msg(name, needed_bytes);
2234 _od_region.print_out_of_space_msg(name, needed_bytes);
2235
2236 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2237 "Please reduce the number of shared classes.");
2238 }