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