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/classLoaderDataGraph.hpp"
28 #include "classfile/classListParser.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/dictionary.hpp"
31 #include "classfile/loaderConstraints.hpp"
32 #include "classfile/placeholders.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/systemDictionaryShared.hpp"
37 #include "code/codeCache.hpp"
38 #include "interpreter/bytecodeStream.hpp"
39 #include "interpreter/bytecodes.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logMessage.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/heapShared.inline.hpp"
44 #include "memory/metaspace.hpp"
45 #include "memory/metaspaceClosure.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "oops/compressedOops.inline.hpp"
49 #include "oops/instanceClassLoaderKlass.hpp"
50 #include "oops/instanceMirrorKlass.hpp"
51 #include "oops/instanceRefKlass.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/objArrayOop.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/typeArrayKlass.hpp"
56 #include "prims/jvmtiRedefineClasses.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/timerTrace.hpp"
62 #include "runtime/vmThread.hpp"
63 #include "runtime/vm_operations.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/bitMap.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/hashtable.inline.hpp"
68 #if INCLUDE_G1GC
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 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 HeapShared::archive_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->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 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);
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/string/subgraph_info tables
422 SymbolTable::serialize_shared_table_header(soc);
423 StringTable::serialize_shared_table_header(soc);
424 HeapShared::serialize_subgraph_info_table_header(soc);
425
426 JavaClasses::serialize_offsets(soc);
427 InstanceMirrorKlass::serialize_offsets(soc);
428 soc->do_tag(--tag);
429
430 soc->do_tag(666);
431 }
432
433 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
434 if (DumpSharedSpaces) {
435 if (_cds_i2i_entry_code_buffers == NULL) {
436 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
437 _cds_i2i_entry_code_buffers_size = total_size;
438 }
439 } else if (UseSharedSpaces) {
440 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
441 } else {
442 return NULL;
443 }
444
445 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
446 return _cds_i2i_entry_code_buffers;
447 }
448
449 // CDS code for dumping shared archive.
450
451 // Global object for holding classes that have been loaded. Since this
452 // is run at a safepoint just before exit, this is the entire set of classes.
453 static GrowableArray<Klass*>* _global_klass_objects;
454
455 GrowableArray<Klass*>* MetaspaceShared::collected_klasses() {
456 return _global_klass_objects;
457 }
458
459 static void collect_array_classes(Klass* k) {
460 _global_klass_objects->append_if_missing(k);
461 if (k->is_array_klass()) {
462 // Add in the array classes too
463 ArrayKlass* ak = ArrayKlass::cast(k);
464 Klass* h = ak->higher_dimension();
465 if (h != NULL) {
466 h->array_klasses_do(collect_array_classes);
467 }
468 }
469 }
470
471 class CollectClassesClosure : public KlassClosure {
472 void do_klass(Klass* k) {
473 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) {
474 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) {
475 // Mark any class with signers and don't add to the _global_klass_objects
476 k->set_has_signer_and_not_archived();
477 } else {
478 _global_klass_objects->append_if_missing(k);
479 }
480 }
481 if (k->is_array_klass()) {
482 // Add in the array classes too
483 ArrayKlass* ak = ArrayKlass::cast(k);
484 Klass* h = ak->higher_dimension();
485 if (h != NULL) {
486 h->array_klasses_do(collect_array_classes);
487 }
488 }
489 }
490 };
491
492 static void remove_unshareable_in_classes() {
493 for (int i = 0; i < _global_klass_objects->length(); i++) {
494 Klass* k = _global_klass_objects->at(i);
495 if (!k->is_objArray_klass()) {
496 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
497 // on their array classes.
498 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
499 k->remove_unshareable_info();
500 }
501 }
502 }
503
504 static void remove_java_mirror_in_classes() {
505 for (int i = 0; i < _global_klass_objects->length(); i++) {
506 Klass* k = _global_klass_objects->at(i);
507 if (!k->is_objArray_klass()) {
508 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
509 // on their array classes.
510 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
511 k->remove_java_mirror();
512 }
513 }
514 }
515
516 static void clear_basic_type_mirrors() {
517 assert(!HeapShared::is_heap_object_archiving_allowed(), "Sanity");
518 Universe::set_int_mirror(NULL);
519 Universe::set_float_mirror(NULL);
520 Universe::set_double_mirror(NULL);
521 Universe::set_byte_mirror(NULL);
522 Universe::set_bool_mirror(NULL);
523 Universe::set_char_mirror(NULL);
524 Universe::set_long_mirror(NULL);
525 Universe::set_short_mirror(NULL);
526 Universe::set_void_mirror(NULL);
527 }
528
529 static void rewrite_nofast_bytecode(Method* method) {
530 BytecodeStream bcs(method);
531 while (!bcs.is_last_bytecode()) {
532 Bytecodes::Code opcode = bcs.next();
533 switch (opcode) {
534 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
535 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
536 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
537 case Bytecodes::_iload: {
538 if (!bcs.is_wide()) {
539 *bcs.bcp() = Bytecodes::_nofast_iload;
540 }
541 break;
542 }
543 default: break;
544 }
545 }
546 }
547
548 // Walk all methods in the class list to ensure that they won't be modified at
549 // run time. This includes:
550 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
551 // at run time by RewriteBytecodes/RewriteFrequentPairs
552 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
553 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
554 for (int i = 0; i < _global_klass_objects->length(); i++) {
555 Klass* k = _global_klass_objects->at(i);
556 if (k->is_instance_klass()) {
557 InstanceKlass* ik = InstanceKlass::cast(k);
558 for (int i = 0; i < ik->methods()->length(); i++) {
559 Method* m = ik->methods()->at(i);
560 rewrite_nofast_bytecode(m);
561 Fingerprinter fp(m);
562 // The side effect of this call sets method's fingerprint field.
563 fp.fingerprint();
564 }
565 }
566 }
567 }
568
569 static void relocate_cached_class_file() {
570 for (int i = 0; i < _global_klass_objects->length(); i++) {
571 Klass* k = _global_klass_objects->at(i);
572 if (k->is_instance_klass()) {
573 InstanceKlass* ik = InstanceKlass::cast(k);
574 JvmtiCachedClassFileData* p = ik->get_archived_class_data();
575 if (p != NULL) {
576 int size = offset_of(JvmtiCachedClassFileData, data) + p->length;
577 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size);
578 q->length = p->length;
579 memcpy(q->data, p->data, p->length);
580 ik->set_archived_class_data(q);
581 }
582 }
583 }
584 }
585
586 NOT_PRODUCT(
587 static void assert_not_unsafe_anonymous_class(InstanceKlass* k) {
588 assert(!(k->is_unsafe_anonymous()), "cannot archive unsafe anonymous classes");
589 }
590
591 // Unsafe anonymous classes are not stored inside any dictionaries.
592 static void assert_no_unsafe_anonymous_classes_in_dictionaries() {
593 ClassLoaderDataGraph::dictionary_classes_do(assert_not_unsafe_anonymous_class);
594 })
595
596 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
597 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
598 //
599 // Addresses of the vtables and the methods may be different across JVM runs,
600 // if libjvm.so is dynamically loaded at a different base address.
601 //
602 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
603 //
604 // + at dump time: we redirect the _vptr to point to our own vtables inside
605 // the CDS image
606 // + at run time: we clone the actual contents of the vtables from libjvm.so
607 // into our own tables.
608
609 // Currently, the archive contain ONLY the following types of objects that have C++ vtables.
610 #define CPP_VTABLE_PATCH_TYPES_DO(f) \
611 f(ConstantPool) \
612 f(InstanceKlass) \
613 f(InstanceClassLoaderKlass) \
614 f(InstanceMirrorKlass) \
615 f(InstanceRefKlass) \
616 f(Method) \
617 f(ObjArrayKlass) \
618 f(TypeArrayKlass)
619
620 class CppVtableInfo {
621 intptr_t _vtable_size;
622 intptr_t _cloned_vtable[1];
623 public:
624 static int num_slots(int vtable_size) {
625 return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
626 }
627 int vtable_size() { return int(uintx(_vtable_size)); }
628 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
629 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
630 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
631 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
632 static size_t byte_size(int vtable_size) {
633 CppVtableInfo i;
634 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
635 }
636 };
637
638 template <class T> class CppVtableCloner : public T {
639 static intptr_t* vtable_of(Metadata& m) {
640 return *((intptr_t**)&m);
641 }
642 static CppVtableInfo* _info;
643
644 static int get_vtable_length(const char* name);
645
646 public:
647 // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
648 static intptr_t* allocate(const char* name);
649
650 // Clone the vtable to ...
651 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
652
653 static void zero_vtable_clone() {
654 assert(DumpSharedSpaces, "dump-time only");
655 _info->zero();
656 }
657
658 // Switch the vtable pointer to point to the cloned vtable.
659 static void patch(Metadata* obj) {
660 assert(DumpSharedSpaces, "dump-time only");
661 *(void**)obj = (void*)(_info->cloned_vtable());
662 }
663
664 static bool is_valid_shared_object(const T* obj) {
665 intptr_t* vptr = *(intptr_t**)obj;
666 return vptr == _info->cloned_vtable();
667 }
668 };
669
670 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
671
672 template <class T>
673 intptr_t* CppVtableCloner<T>::allocate(const char* name) {
674 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
675 int n = get_vtable_length(name);
676 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
677 _info->set_vtable_size(n);
678
679 intptr_t* p = clone_vtable(name, _info);
680 assert((char*)p == _md_region.top(), "must be");
681
682 return p;
683 }
684
685 template <class T>
686 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
687 if (!DumpSharedSpaces) {
688 assert(_info == 0, "_info is initialized only at dump time");
689 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
690 }
691 T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
692 int n = info->vtable_size();
693 intptr_t* srcvtable = vtable_of(tmp);
694 intptr_t* dstvtable = info->cloned_vtable();
695
696 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
697 // safe to do memcpy.
698 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
699 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
700 return dstvtable + n;
701 }
702
703 // To determine the size of the vtable for each type, we use the following
704 // trick by declaring 2 subclasses:
705 //
706 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
707 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
708 //
709 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
710 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
711 // - The first N entries have are exactly the same as in InstanceKlass's vtable.
712 // - Their last entry is different.
713 //
714 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
715 // and find the first entry that's different.
716 //
717 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
718 // esoteric compilers.
719
720 template <class T> class CppVtableTesterB: public T {
721 public:
722 virtual int last_virtual_method() {return 1;}
723 };
724
725 template <class T> class CppVtableTesterA : public T {
726 public:
727 virtual void* last_virtual_method() {
728 // Make this different than CppVtableTesterB::last_virtual_method so the C++
729 // compiler/linker won't alias the two functions.
730 return NULL;
731 }
732 };
733
734 template <class T>
735 int CppVtableCloner<T>::get_vtable_length(const char* name) {
736 CppVtableTesterA<T> a;
737 CppVtableTesterB<T> b;
738
739 intptr_t* avtable = vtable_of(a);
740 intptr_t* bvtable = vtable_of(b);
741
742 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
743 int vtable_len = 1;
744 for (; ; vtable_len++) {
745 if (avtable[vtable_len] != bvtable[vtable_len]) {
746 break;
747 }
748 }
749 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
750
751 return vtable_len;
752 }
753
754 #define ALLOC_CPP_VTABLE_CLONE(c) \
755 CppVtableCloner<c>::allocate(#c);
756
757 #define CLONE_CPP_VTABLE(c) \
758 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
759
760 #define ZERO_CPP_VTABLE(c) \
761 CppVtableCloner<c>::zero_vtable_clone();
762
763 // This can be called at both dump time and run time.
764 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
765 assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
766 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
767 return p;
768 }
769
770 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
771 assert(DumpSharedSpaces, "dump-time only");
772 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
773 }
774
775 // Allocate and initialize the C++ vtables, starting from top, but do not go past end.
776 void MetaspaceShared::allocate_cpp_vtable_clones() {
777 assert(DumpSharedSpaces, "dump-time only");
778 // Layout (each slot is a intptr_t):
779 // [number of slots in the first vtable = n1]
780 // [ <n1> slots for the first vtable]
781 // [number of slots in the first second = n2]
782 // [ <n2> slots for the second vtable]
783 // ...
784 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
785 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
786 }
787
788 // Switch the vtable pointer to point to the cloned vtable. We assume the
789 // vtable pointer is in first slot in object.
790 void MetaspaceShared::patch_cpp_vtable_pointers() {
791 int n = _global_klass_objects->length();
792 for (int i = 0; i < n; i++) {
793 Klass* obj = _global_klass_objects->at(i);
794 if (obj->is_instance_klass()) {
795 InstanceKlass* ik = InstanceKlass::cast(obj);
796 if (ik->is_class_loader_instance_klass()) {
797 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
798 } else if (ik->is_reference_instance_klass()) {
799 CppVtableCloner<InstanceRefKlass>::patch(ik);
800 } else if (ik->is_mirror_instance_klass()) {
801 CppVtableCloner<InstanceMirrorKlass>::patch(ik);
802 } else {
803 CppVtableCloner<InstanceKlass>::patch(ik);
804 }
805 ConstantPool* cp = ik->constants();
806 CppVtableCloner<ConstantPool>::patch(cp);
807 for (int j = 0; j < ik->methods()->length(); j++) {
808 Method* m = ik->methods()->at(j);
809 CppVtableCloner<Method>::patch(m);
810 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
811 }
812 } else if (obj->is_objArray_klass()) {
813 CppVtableCloner<ObjArrayKlass>::patch(obj);
814 } else {
815 assert(obj->is_typeArray_klass(), "sanity");
816 CppVtableCloner<TypeArrayKlass>::patch(obj);
817 }
818 }
819 }
820
821 bool MetaspaceShared::is_valid_shared_method(const Method* m) {
822 assert(is_in_shared_metaspace(m), "must be");
823 return CppVtableCloner<Method>::is_valid_shared_object(m);
824 }
825
826 // Closure for serializing initialization data out to a data area to be
827 // written to the shared file.
828
829 class WriteClosure : public SerializeClosure {
830 private:
831 DumpRegion* _dump_region;
832
833 public:
834 WriteClosure(DumpRegion* r) {
835 _dump_region = r;
836 }
837
838 void do_ptr(void** p) {
839 _dump_region->append_intptr_t((intptr_t)*p);
840 }
841
842 void do_u4(u4* p) {
843 void* ptr = (void*)(uintx(*p));
844 do_ptr(&ptr);
845 }
846
847 void do_tag(int tag) {
848 _dump_region->append_intptr_t((intptr_t)tag);
849 }
850
851 void do_oop(oop* o) {
852 if (*o == NULL) {
853 _dump_region->append_intptr_t(0);
854 } else {
855 assert(HeapShared::is_heap_object_archiving_allowed(),
856 "Archiving heap object is not allowed");
857 _dump_region->append_intptr_t(
858 (intptr_t)CompressedOops::encode_not_null(*o));
859 }
860 }
861
862 void do_region(u_char* start, size_t size) {
863 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
864 assert(size % sizeof(intptr_t) == 0, "bad size");
865 do_tag((int)size);
866 while (size > 0) {
867 _dump_region->append_intptr_t(*(intptr_t*)start);
868 start += sizeof(intptr_t);
869 size -= sizeof(intptr_t);
870 }
871 }
872
873 bool reading() const { return false; }
874 };
875
876 // This is for dumping detailed statistics for the allocations
877 // in the shared spaces.
878 class DumpAllocStats : public ResourceObj {
879 public:
880
881 // Here's poor man's enum inheritance
882 #define SHAREDSPACE_OBJ_TYPES_DO(f) \
883 METASPACE_OBJ_TYPES_DO(f) \
884 f(SymbolHashentry) \
885 f(SymbolBucket) \
886 f(StringHashentry) \
887 f(StringBucket) \
888 f(Other)
889
890 enum Type {
891 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
892 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
893 _number_of_types
894 };
895
896 static const char * type_name(Type type) {
897 switch(type) {
898 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
899 default:
900 ShouldNotReachHere();
901 return NULL;
902 }
903 }
904
905 public:
906 enum { RO = 0, RW = 1 };
907
908 int _counts[2][_number_of_types];
909 int _bytes [2][_number_of_types];
910
911 DumpAllocStats() {
912 memset(_counts, 0, sizeof(_counts));
913 memset(_bytes, 0, sizeof(_bytes));
914 };
915
916 void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
917 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
918 int which = (read_only) ? RO : RW;
919 _counts[which][type] ++;
920 _bytes [which][type] += byte_size;
921 }
922
923 void record_other_type(int byte_size, bool read_only) {
924 int which = (read_only) ? RO : RW;
925 _bytes [which][OtherType] += byte_size;
926 }
927 void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
928 };
929
930 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
931 // Calculate size of data that was not allocated by Metaspace::allocate()
932 MetaspaceSharedStats *stats = MetaspaceShared::stats();
933
934 // symbols
935 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
936 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
937
938 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
939 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
940
941 // strings
942 _counts[RO][StringHashentryType] = stats->string.hashentry_count;
943 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
944
945 _counts[RO][StringBucketType] = stats->string.bucket_count;
946 _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
947
948 // TODO: count things like dictionary, vtable, etc
949 _bytes[RW][OtherType] += mc_all + md_all;
950 rw_all += mc_all + md_all; // mc/md are mapped Read/Write
951
952 // prevent divide-by-zero
953 if (ro_all < 1) {
954 ro_all = 1;
955 }
956 if (rw_all < 1) {
957 rw_all = 1;
958 }
959
960 int all_ro_count = 0;
961 int all_ro_bytes = 0;
962 int all_rw_count = 0;
963 int all_rw_bytes = 0;
964
965 // To make fmt_stats be a syntactic constant (for format warnings), use #define.
966 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
967 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
968 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
969
970 LogMessage(cds) msg;
971
972 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
973 msg.info("%s", hdr);
974 msg.info("%s", sep);
975 for (int type = 0; type < int(_number_of_types); type ++) {
976 const char *name = type_name((Type)type);
977 int ro_count = _counts[RO][type];
978 int ro_bytes = _bytes [RO][type];
979 int rw_count = _counts[RW][type];
980 int rw_bytes = _bytes [RW][type];
981 int count = ro_count + rw_count;
982 int bytes = ro_bytes + rw_bytes;
983
984 double ro_perc = percent_of(ro_bytes, ro_all);
985 double rw_perc = percent_of(rw_bytes, rw_all);
986 double perc = percent_of(bytes, ro_all + rw_all);
987
988 msg.info(fmt_stats, name,
989 ro_count, ro_bytes, ro_perc,
990 rw_count, rw_bytes, rw_perc,
991 count, bytes, perc);
992
993 all_ro_count += ro_count;
994 all_ro_bytes += ro_bytes;
995 all_rw_count += rw_count;
996 all_rw_bytes += rw_bytes;
997 }
998
999 int all_count = all_ro_count + all_rw_count;
1000 int all_bytes = all_ro_bytes + all_rw_bytes;
1001
1002 double all_ro_perc = percent_of(all_ro_bytes, ro_all);
1003 double all_rw_perc = percent_of(all_rw_bytes, rw_all);
1004 double all_perc = percent_of(all_bytes, ro_all + rw_all);
1005
1006 msg.info("%s", sep);
1007 msg.info(fmt_stats, "Total",
1008 all_ro_count, all_ro_bytes, all_ro_perc,
1009 all_rw_count, all_rw_bytes, all_rw_perc,
1010 all_count, all_bytes, all_perc);
1011
1012 assert(all_ro_bytes == ro_all, "everything should have been counted");
1013 assert(all_rw_bytes == rw_all, "everything should have been counted");
1014
1015 #undef fmt_stats
1016 }
1017
1018 // Populate the shared space.
1019
1020 class VM_PopulateDumpSharedSpace: public VM_Operation {
1021 private:
1022 GrowableArray<MemRegion> *_closed_archive_heap_regions;
1023 GrowableArray<MemRegion> *_open_archive_heap_regions;
1024
1025 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
1026 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
1027
1028 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
1029 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
1030 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1031 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
1032 void dump_symbols();
1033 char* dump_read_only_tables();
1034 void print_region_stats();
1035 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1036 const char *name, const size_t total_size);
1037 public:
1038
1039 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
1040 void doit(); // outline because gdb sucks
1041 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
1042 bool allow_nested_vm_operations() const { return true; }
1043 }; // class VM_PopulateDumpSharedSpace
1044
1045 class SortedSymbolClosure: public SymbolClosure {
1046 GrowableArray<Symbol*> _symbols;
1047 virtual void do_symbol(Symbol** sym) {
1048 assert((*sym)->is_permanent(), "archived symbols must be permanent");
1049 _symbols.append(*sym);
1050 }
1051 static int compare_symbols_by_address(Symbol** a, Symbol** b) {
1052 if (a[0] < b[0]) {
1053 return -1;
1054 } else if (a[0] == b[0]) {
1055 return 0;
1056 } else {
1057 return 1;
1058 }
1059 }
1060
1061 public:
1062 SortedSymbolClosure() {
1063 SymbolTable::symbols_do(this);
1064 _symbols.sort(compare_symbols_by_address);
1065 }
1066 GrowableArray<Symbol*>* get_sorted_symbols() {
1067 return &_symbols;
1068 }
1069 };
1070
1071 // ArchiveCompactor --
1072 //
1073 // This class is the central piece of shared archive compaction -- all metaspace data are
1074 // initially allocated outside of the shared regions. ArchiveCompactor copies the
1075 // metaspace data into their final location in the shared regions.
1076
1077 class ArchiveCompactor : AllStatic {
1078 static DumpAllocStats* _alloc_stats;
1079 static SortedSymbolClosure* _ssc;
1080
1081 static unsigned my_hash(const address& a) {
1082 return primitive_hash<address>(a);
1083 }
1084 static bool my_equals(const address& a0, const address& a1) {
1085 return primitive_equals<address>(a0, a1);
1086 }
1087 typedef ResourceHashtable<
1088 address, address,
1089 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address>
1090 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address>
1091 16384, ResourceObj::C_HEAP> RelocationTable;
1092 static RelocationTable* _new_loc_table;
1093
1094 public:
1095 static void initialize() {
1096 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
1097 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable;
1098 }
1099 static DumpAllocStats* alloc_stats() {
1100 return _alloc_stats;
1101 }
1102
1103 // Use this when you allocate space with MetaspaceShare::read_only_space_alloc()
1104 // outside of ArchiveCompactor::allocate(). These are usually for misc tables
1105 // that are allocated in the RO space.
1106 class OtherROAllocMark {
1107 char* _oldtop;
1108 public:
1109 OtherROAllocMark() {
1110 _oldtop = _ro_region.top();
1111 }
1112 ~OtherROAllocMark() {
1113 char* newtop = _ro_region.top();
1114 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
1115 }
1116 };
1117
1118 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
1119 address obj = ref->obj();
1120 int bytes = ref->size() * BytesPerWord;
1121 char* p;
1122 size_t alignment = BytesPerWord;
1123 char* oldtop;
1124 char* newtop;
1125
1126 if (read_only) {
1127 oldtop = _ro_region.top();
1128 p = _ro_region.allocate(bytes, alignment);
1129 newtop = _ro_region.top();
1130 } else {
1131 oldtop = _rw_region.top();
1132 p = _rw_region.allocate(bytes, alignment);
1133 newtop = _rw_region.top();
1134 }
1135 memcpy(p, obj, bytes);
1136 bool isnew = _new_loc_table->put(obj, (address)p);
1137 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
1138 assert(isnew, "must be");
1139
1140 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
1141 if (ref->msotype() == MetaspaceObj::SymbolType) {
1142 uintx delta = MetaspaceShared::object_delta(p);
1143 if (delta > MAX_SHARED_DELTA) {
1144 // This is just a sanity check and should not appear in any real world usage. This
1145 // happens only if you allocate more than 2GB of Symbols and would require
1146 // millions of shared classes.
1147 vm_exit_during_initialization("Too many Symbols in the CDS archive",
1148 "Please reduce the number of shared classes.");
1149 }
1150 }
1151 }
1152
1153 static address get_new_loc(MetaspaceClosure::Ref* ref) {
1154 address* pp = _new_loc_table->get(ref->obj());
1155 assert(pp != NULL, "must be");
1156 return *pp;
1157 }
1158
1159 private:
1160 // Makes a shallow copy of visited MetaspaceObj's
1161 class ShallowCopier: public UniqueMetaspaceClosure {
1162 bool _read_only;
1163 public:
1164 ShallowCopier(bool read_only) : _read_only(read_only) {}
1165
1166 virtual void do_unique_ref(Ref* ref, bool read_only) {
1167 if (read_only == _read_only) {
1168 allocate(ref, read_only);
1169 }
1170 }
1171 };
1172
1173 // Relocate embedded pointers within a MetaspaceObj's shallow copy
1174 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
1175 public:
1176 virtual void do_unique_ref(Ref* ref, bool read_only) {
1177 address new_loc = get_new_loc(ref);
1178 RefRelocator refer;
1179 ref->metaspace_pointers_do_at(&refer, new_loc);
1180 }
1181 };
1182
1183 // Relocate a reference to point to its shallow copy
1184 class RefRelocator: public MetaspaceClosure {
1185 public:
1186 virtual bool do_ref(Ref* ref, bool read_only) {
1187 if (ref->not_null()) {
1188 ref->update(get_new_loc(ref));
1189 }
1190 return false; // Do not recurse.
1191 }
1192 };
1193
1194 #ifdef ASSERT
1195 class IsRefInArchiveChecker: public MetaspaceClosure {
1196 public:
1197 virtual bool do_ref(Ref* ref, bool read_only) {
1198 if (ref->not_null()) {
1199 char* obj = (char*)ref->obj();
1200 assert(_ro_region.contains(obj) || _rw_region.contains(obj),
1201 "must be relocated to point to CDS archive");
1202 }
1203 return false; // Do not recurse.
1204 }
1205 };
1206 #endif
1207
1208 public:
1209 static void copy_and_compact() {
1210 ResourceMark rm;
1211 SortedSymbolClosure the_ssc; // StackObj
1212 _ssc = &the_ssc;
1213
1214 tty->print_cr("Scanning all metaspace objects ... ");
1215 {
1216 // allocate and shallow-copy RW objects, immediately following the MC region
1217 tty->print_cr("Allocating RW objects ... ");
1218 _mc_region.pack(&_rw_region);
1219
1220 ResourceMark rm;
1221 ShallowCopier rw_copier(false);
1222 iterate_roots(&rw_copier);
1223 }
1224 {
1225 // allocate and shallow-copy of RO object, immediately following the RW region
1226 tty->print_cr("Allocating RO objects ... ");
1227 _rw_region.pack(&_ro_region);
1228
1229 ResourceMark rm;
1230 ShallowCopier ro_copier(true);
1231 iterate_roots(&ro_copier);
1232 }
1233 {
1234 tty->print_cr("Relocating embedded pointers ... ");
1235 ResourceMark rm;
1236 ShallowCopyEmbeddedRefRelocator emb_reloc;
1237 iterate_roots(&emb_reloc);
1238 }
1239 {
1240 tty->print_cr("Relocating external roots ... ");
1241 ResourceMark rm;
1242 RefRelocator ext_reloc;
1243 iterate_roots(&ext_reloc);
1244 }
1245
1246 #ifdef ASSERT
1247 {
1248 tty->print_cr("Verifying external roots ... ");
1249 ResourceMark rm;
1250 IsRefInArchiveChecker checker;
1251 iterate_roots(&checker);
1252 }
1253 #endif
1254
1255
1256 // cleanup
1257 _ssc = NULL;
1258 }
1259
1260 // We must relocate the System::_well_known_klasses only after we have copied the
1261 // java objects in during dump_java_heap_objects(): during the object copy, we operate on
1262 // old objects which assert that their klass is the original klass.
1263 static void relocate_well_known_klasses() {
1264 {
1265 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
1266 ResourceMark rm;
1267 RefRelocator ext_reloc;
1268 SystemDictionary::well_known_klasses_do(&ext_reloc);
1269 }
1270 // NOTE: after this point, we shouldn't have any globals that can reach the old
1271 // objects.
1272
1273 // We cannot use any of the objects in the heap anymore (except for the objects
1274 // in the CDS shared string regions) because their headers no longer point to
1275 // valid Klasses.
1276 }
1277
1278 static void iterate_roots(MetaspaceClosure* it) {
1279 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
1280 for (int i=0; i<symbols->length(); i++) {
1281 it->push(symbols->adr_at(i));
1282 }
1283 if (_global_klass_objects != NULL) {
1284 // Need to fix up the pointers
1285 for (int i = 0; i < _global_klass_objects->length(); i++) {
1286 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
1287 it->push(_global_klass_objects->adr_at(i));
1288 }
1289 }
1290 FileMapInfo::metaspace_pointers_do(it);
1291 SystemDictionary::classes_do(it);
1292 Universe::metaspace_pointers_do(it);
1293 SymbolTable::metaspace_pointers_do(it);
1294 vmSymbols::metaspace_pointers_do(it);
1295 }
1296
1297 static Klass* get_relocated_klass(Klass* orig_klass) {
1298 assert(DumpSharedSpaces, "dump time only");
1299 address* pp = _new_loc_table->get((address)orig_klass);
1300 assert(pp != NULL, "must be");
1301 Klass* klass = (Klass*)(*pp);
1302 assert(klass->is_klass(), "must be");
1303 return klass;
1304 }
1305 };
1306
1307 DumpAllocStats* ArchiveCompactor::_alloc_stats;
1308 SortedSymbolClosure* ArchiveCompactor::_ssc;
1309 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
1310
1311 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
1312 DumpRegion* dump_region, bool read_only, bool allow_exec) {
1313 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1314 }
1315
1316 void VM_PopulateDumpSharedSpace::dump_symbols() {
1317 tty->print_cr("Dumping symbol table ...");
1318
1319 NOT_PRODUCT(SymbolTable::verify());
1320 SymbolTable::write_to_archive();
1321 }
1322
1323 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
1324 ArchiveCompactor::OtherROAllocMark mark;
1325 // Reorder the system dictionary. Moving the symbols affects
1326 // how the hash table indices are calculated.
1327 SystemDictionary::reorder_dictionary_for_sharing();
1328
1329 tty->print("Removing java_mirror ... ");
1330 if (!HeapShared::is_heap_object_archiving_allowed()) {
1331 clear_basic_type_mirrors();
1332 }
1333 remove_java_mirror_in_classes();
1334 tty->print_cr("done. ");
1335 NOT_PRODUCT(SystemDictionary::verify();)
1336
1337 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets();
1338 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t));
1339 SystemDictionary::copy_buckets(buckets_top, _ro_region.top());
1340
1341 size_t table_bytes = SystemDictionary::count_bytes_for_table();
1342 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t));
1343 SystemDictionary::copy_table(table_top, _ro_region.top());
1344
1345 // Write the other data to the output array.
1346 WriteClosure wc(&_ro_region);
1347 MetaspaceShared::serialize(&wc);
1348
1349 // Write the bitmaps for patching the archive heap regions
1350 dump_archive_heap_oopmaps();
1351
1352 return buckets_top;
1353 }
1354
1355 void VM_PopulateDumpSharedSpace::doit() {
1356 // We should no longer allocate anything from the metaspace, so that:
1357 //
1358 // (1) Metaspace::allocate might trigger GC if we have run out of
1359 // committed metaspace, but we can't GC because we're running
1360 // in the VM thread.
1361 // (2) ArchiveCompactor needs to work with a stable set of MetaspaceObjs.
1362 Metaspace::freeze();
1363
1364 Thread* THREAD = VMThread::vm_thread();
1365
1366 FileMapInfo::check_nonempty_dir_in_shared_path_table();
1367
1368 NOT_PRODUCT(SystemDictionary::verify();)
1369 // The following guarantee is meant to ensure that no loader constraints
1370 // exist yet, since the constraints table is not shared. This becomes
1371 // more important now that we don't re-initialize vtables/itables for
1372 // shared classes at runtime, where constraints were previously created.
1373 guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
1374 "loader constraints are not saved");
1375 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
1376 "placeholders are not saved");
1377 // Revisit and implement this if we prelink method handle call sites:
1378 guarantee(SystemDictionary::invoke_method_table() == NULL ||
1379 SystemDictionary::invoke_method_table()->number_of_entries() == 0,
1380 "invoke method table is not saved");
1381
1382 // At this point, many classes have been loaded.
1383 // Gather systemDictionary classes in a global array and do everything to
1384 // that so we don't have to walk the SystemDictionary again.
1385 _global_klass_objects = new GrowableArray<Klass*>(1000);
1386 CollectClassesClosure collect_classes;
1387 ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
1388
1389 tty->print_cr("Number of classes %d", _global_klass_objects->length());
1390 {
1391 int num_type_array = 0, num_obj_array = 0, num_inst = 0;
1392 for (int i = 0; i < _global_klass_objects->length(); i++) {
1393 Klass* k = _global_klass_objects->at(i);
1394 if (k->is_instance_klass()) {
1395 num_inst ++;
1396 } else if (k->is_objArray_klass()) {
1397 num_obj_array ++;
1398 } else {
1399 assert(k->is_typeArray_klass(), "sanity");
1400 num_type_array ++;
1401 }
1402 }
1403 tty->print_cr(" instance classes = %5d", num_inst);
1404 tty->print_cr(" obj array classes = %5d", num_obj_array);
1405 tty->print_cr(" type array classes = %5d", num_type_array);
1406 }
1407
1408 // Ensure the ConstMethods won't be modified at run-time
1409 tty->print("Updating ConstMethods ... ");
1410 rewrite_nofast_bytecodes_and_calculate_fingerprints();
1411 tty->print_cr("done. ");
1412
1413 // Move classes from platform/system dictionaries into the boot dictionary
1414 SystemDictionary::combine_shared_dictionaries();
1415
1416 // Make sure all classes have a correct loader type.
1417 ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(MetaspaceShared::check_shared_class_loader_type);
1418
1419 // Remove all references outside the metadata
1420 tty->print("Removing unshareable information ... ");
1421 remove_unshareable_in_classes();
1422 tty->print_cr("done. ");
1423
1424 // We don't support archiving unsafe anonymous classes. Verify that they are not stored in
1425 // any dictionaries.
1426 NOT_PRODUCT(assert_no_unsafe_anonymous_classes_in_dictionaries());
1427
1428 ArchiveCompactor::initialize();
1429 ArchiveCompactor::copy_and_compact();
1430
1431 dump_symbols();
1432
1433 // Dump supported java heap objects
1434 _closed_archive_heap_regions = NULL;
1435 _open_archive_heap_regions = NULL;
1436 dump_java_heap_objects();
1437
1438 ArchiveCompactor::relocate_well_known_klasses();
1439
1440 char* read_only_tables_start = dump_read_only_tables();
1441 _ro_region.pack(&_md_region);
1442
1443 char* vtbl_list = _md_region.top();
1444 MetaspaceShared::allocate_cpp_vtable_clones();
1445 _md_region.pack(&_od_region);
1446
1447 // Relocate the archived class file data into the od region
1448 relocate_cached_class_file();
1449 _od_region.pack();
1450
1451 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size
1452 // is just the spaces between the two ends.
1453 size_t core_spaces_size = _od_region.end() - _mc_region.base();
1454 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
1455 "should already be aligned");
1456
1457 // During patching, some virtual methods may be called, so at this point
1458 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
1459 MetaspaceShared::patch_cpp_vtable_pointers();
1460
1461 // The vtable clones contain addresses of the current process.
1462 // We don't want to write these addresses into the archive.
1463 MetaspaceShared::zero_cpp_vtable_clones_for_writing();
1464
1465 // Create and write the archive file that maps the shared spaces.
1466
1467 FileMapInfo* mapinfo = new FileMapInfo();
1468 mapinfo->populate_header(os::vm_allocation_granularity());
1469 mapinfo->set_read_only_tables_start(read_only_tables_start);
1470 mapinfo->set_misc_data_patching_start(vtbl_list);
1471 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
1472 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
1473 mapinfo->set_core_spaces_size(core_spaces_size);
1474
1475 for (int pass=1; pass<=2; pass++) {
1476 if (pass == 1) {
1477 // The first pass doesn't actually write the data to disk. All it
1478 // does is to update the fields in the mapinfo->_header.
1479 } else {
1480 // After the first pass, the contents of mapinfo->_header are finalized,
1481 // so we can compute the header's CRC, and write the contents of the header
1482 // and the regions into disk.
1483 mapinfo->open_for_write();
1484 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1485 }
1486 mapinfo->write_header();
1487
1488 // NOTE: md contains the trampoline code for method entries, which are patched at run time,
1489 // so it needs to be read/write.
1490 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
1491 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1492 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1493 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
1494 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false);
1495
1496 _total_string_region_size = mapinfo->write_archive_heap_regions(
1497 _closed_archive_heap_regions,
1498 _closed_archive_heap_oopmaps,
1499 MetaspaceShared::first_string,
1500 MetaspaceShared::max_strings);
1501 _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
1502 _open_archive_heap_regions,
1503 _open_archive_heap_oopmaps,
1504 MetaspaceShared::first_open_archive_heap_region,
1505 MetaspaceShared::max_open_archive_heap_region);
1506 }
1507
1508 mapinfo->close();
1509
1510 // Restore the vtable in case we invoke any virtual methods.
1511 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
1512
1513 print_region_stats();
1514
1515 if (log_is_enabled(Info, cds)) {
1516 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
1517 int(_mc_region.used()), int(_md_region.used()));
1518 }
1519
1520 if (PrintSystemDictionaryAtExit) {
1521 SystemDictionary::print();
1522 }
1523 // There may be other pending VM operations that operate on the InstanceKlasses,
1524 // which will fail because InstanceKlasses::remove_unshareable_info()
1525 // has been called. Forget these operations and exit the VM directly.
1526 vm_direct_exit(0);
1527 }
1528
1529 void VM_PopulateDumpSharedSpace::print_region_stats() {
1530 // Print statistics of all the regions
1531 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1532 _mc_region.reserved() + _md_region.reserved() +
1533 _od_region.reserved() +
1534 _total_string_region_size +
1535 _total_open_archive_region_size;
1536 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1537 _mc_region.used() + _md_region.used() +
1538 _od_region.used() +
1539 _total_string_region_size +
1540 _total_open_archive_region_size;
1541 const double total_u_perc = percent_of(total_bytes, total_reserved);
1542
1543 _mc_region.print(total_reserved);
1544 _rw_region.print(total_reserved);
1545 _ro_region.print(total_reserved);
1546 _md_region.print(total_reserved);
1547 _od_region.print(total_reserved);
1548 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved);
1549 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
1550
1551 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1552 total_bytes, total_reserved, total_u_perc);
1553 }
1554
1555 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
1556 const char *name, const size_t total_size) {
1557 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
1558 for (int i = 0; i < arr_len; i++) {
1559 char* start = (char*)heap_mem->at(i).start();
1560 size_t size = heap_mem->at(i).byte_size();
1561 char* top = start + size;
1562 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,
1563 name, i, size, size/double(total_size)*100.0, size, p2i(start));
1564
1565 }
1566 }
1567
1568 // Update a Java object to point its Klass* to the new location after
1569 // shared archive has been compacted.
1570 void MetaspaceShared::relocate_klass_ptr(oop o) {
1571 assert(DumpSharedSpaces, "sanity");
1572 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
1573 o->set_klass(k);
1574 }
1575
1576 Klass* MetaspaceShared::get_relocated_klass(Klass *k) {
1577 assert(DumpSharedSpaces, "sanity");
1578 return ArchiveCompactor::get_relocated_klass(k);
1579 }
1580
1581 class LinkSharedClassesClosure : public KlassClosure {
1582 Thread* THREAD;
1583 bool _made_progress;
1584 public:
1585 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
1586
1587 void reset() { _made_progress = false; }
1588 bool made_progress() const { return _made_progress; }
1589
1590 void do_klass(Klass* k) {
1591 if (k->is_instance_klass()) {
1592 InstanceKlass* ik = InstanceKlass::cast(k);
1593 // Link the class to cause the bytecodes to be rewritten and the
1594 // cpcache to be created. Class verification is done according
1595 // to -Xverify setting.
1596 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
1597 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1598
1599 ik->constants()->resolve_class_constants(THREAD);
1600 }
1601 }
1602 };
1603
1604 class CheckSharedClassesClosure : public KlassClosure {
1605 bool _made_progress;
1606 public:
1607 CheckSharedClassesClosure() : _made_progress(false) {}
1608
1609 void reset() { _made_progress = false; }
1610 bool made_progress() const { return _made_progress; }
1611 void do_klass(Klass* k) {
1612 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
1613 _made_progress = true;
1614 }
1615 }
1616 };
1617
1618 void MetaspaceShared::check_shared_class_loader_type(InstanceKlass* ik) {
1619 ResourceMark rm;
1620 if (ik->shared_classpath_index() == UNREGISTERED_INDEX) {
1621 guarantee(ik->loader_type() == 0,
1622 "Class loader type must not be set for this class %s", ik->name()->as_C_string());
1623 } else {
1624 guarantee(ik->loader_type() != 0,
1625 "Class loader type must be set for this class %s", ik->name()->as_C_string());
1626 }
1627 }
1628
1629 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
1630 // We need to iterate because verification may cause additional classes
1631 // to be loaded.
1632 LinkSharedClassesClosure link_closure(THREAD);
1633 do {
1634 link_closure.reset();
1635 ClassLoaderDataGraph::unlocked_loaded_classes_do(&link_closure);
1636 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1637 } while (link_closure.made_progress());
1638
1639 if (_has_error_classes) {
1640 // Mark all classes whose super class or interfaces failed verification.
1641 CheckSharedClassesClosure check_closure;
1642 do {
1643 // Not completely sure if we need to do this iteratively. Anyway,
1644 // we should come here only if there are unverifiable classes, which
1645 // shouldn't happen in normal cases. So better safe than sorry.
1646 check_closure.reset();
1647 ClassLoaderDataGraph::unlocked_loaded_classes_do(&check_closure);
1648 } while (check_closure.made_progress());
1649
1650 // Unverifiable classes will not be included in the CDS archive.
1651 SystemDictionary::remove_classes_in_error_state();
1652 }
1653 }
1654
1655 void MetaspaceShared::prepare_for_dumping() {
1656 Arguments::check_unsupported_dumping_properties();
1657 ClassLoader::initialize_shared_path();
1658 }
1659
1660 // Preload classes from a list, populate the shared spaces and dump to a
1661 // file.
1662 void MetaspaceShared::preload_and_dump(TRAPS) {
1663 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
1664 ResourceMark rm;
1665 char class_list_path_str[JVM_MAXPATHLEN];
1666 // Preload classes to be shared.
1667 // Should use some os:: method rather than fopen() here. aB.
1668 const char* class_list_path;
1669 if (SharedClassListFile == NULL) {
1670 // Construct the path to the class list (in jre/lib)
1671 // Walk up two directories from the location of the VM and
1672 // optionally tack on "lib" (depending on platform)
1673 os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
1674 for (int i = 0; i < 3; i++) {
1675 char *end = strrchr(class_list_path_str, *os::file_separator());
1676 if (end != NULL) *end = '\0';
1677 }
1678 int class_list_path_len = (int)strlen(class_list_path_str);
1679 if (class_list_path_len >= 3) {
1680 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
1681 if (class_list_path_len < JVM_MAXPATHLEN - 4) {
1682 jio_snprintf(class_list_path_str + class_list_path_len,
1683 sizeof(class_list_path_str) - class_list_path_len,
1684 "%slib", os::file_separator());
1685 class_list_path_len += 4;
1686 }
1687 }
1688 }
1689 if (class_list_path_len < JVM_MAXPATHLEN - 10) {
1690 jio_snprintf(class_list_path_str + class_list_path_len,
1691 sizeof(class_list_path_str) - class_list_path_len,
1692 "%sclasslist", os::file_separator());
1693 }
1694 class_list_path = class_list_path_str;
1695 } else {
1696 class_list_path = SharedClassListFile;
1697 }
1698
1699 tty->print_cr("Loading classes to share ...");
1700 _has_error_classes = false;
1701 int class_count = preload_classes(class_list_path, THREAD);
1702 if (ExtraSharedClassListFile) {
1703 class_count += preload_classes(ExtraSharedClassListFile, THREAD);
1704 }
1705 tty->print_cr("Loading classes to share: done.");
1706
1707 log_info(cds)("Shared spaces: preloaded %d classes", class_count);
1708
1709 // Rewrite and link classes
1710 tty->print_cr("Rewriting and linking classes ...");
1711
1712 // Link any classes which got missed. This would happen if we have loaded classes that
1713 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1714 // fails verification, all other interfaces that were not specified in the classlist but
1715 // are implemented by K are not verified.
1716 link_and_cleanup_shared_classes(CATCH);
1717 tty->print_cr("Rewriting and linking classes: done");
1718
1719 SystemDictionary::clear_invoke_method_table();
1720 HeapShared::init_archivable_static_fields(THREAD);
1721
1722 VM_PopulateDumpSharedSpace op;
1723 VMThread::execute(&op);
1724 }
1725 }
1726
1727
1728 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
1729 ClassListParser parser(class_list_path);
1730 int class_count = 0;
1731
1732 while (parser.parse_one_line()) {
1733 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
1734 if (HAS_PENDING_EXCEPTION) {
1735 if (klass == NULL &&
1736 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
1737 // print a warning only when the pending exception is class not found
1738 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
1739 }
1740 CLEAR_PENDING_EXCEPTION;
1741 }
1742 if (klass != NULL) {
1743 if (log_is_enabled(Trace, cds)) {
1744 ResourceMark rm;
1745 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
1746 }
1747
1748 if (klass->is_instance_klass()) {
1749 InstanceKlass* ik = InstanceKlass::cast(klass);
1750
1751 // Link the class to cause the bytecodes to be rewritten and the
1752 // cpcache to be created. The linking is done as soon as classes
1753 // are loaded in order that the related data structures (klass and
1754 // cpCache) are located together.
1755 try_link_class(ik, THREAD);
1756 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
1757 }
1758
1759 class_count++;
1760 }
1761 }
1762
1763 return class_count;
1764 }
1765
1766 // Returns true if the class's status has changed
1767 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
1768 assert(DumpSharedSpaces, "should only be called during dumping");
1769 if (ik->init_state() < InstanceKlass::linked) {
1770 bool saved = BytecodeVerificationLocal;
1771 if (ik->loader_type() == 0 && ik->class_loader() == NULL) {
1772 // The verification decision is based on BytecodeVerificationRemote
1773 // for non-system classes. Since we are using the NULL classloader
1774 // to load non-system classes for customized class loaders during dumping,
1775 // we need to temporarily change BytecodeVerificationLocal to be the same as
1776 // BytecodeVerificationRemote. Note this can cause the parent system
1777 // classes also being verified. The extra overhead is acceptable during
1778 // dumping.
1779 BytecodeVerificationLocal = BytecodeVerificationRemote;
1780 }
1781 ik->link_class(THREAD);
1782 if (HAS_PENDING_EXCEPTION) {
1783 ResourceMark rm;
1784 tty->print_cr("Preload Warning: Verification failed for %s",
1785 ik->external_name());
1786 CLEAR_PENDING_EXCEPTION;
1787 ik->set_in_error_state();
1788 _has_error_classes = true;
1789 }
1790 BytecodeVerificationLocal = saved;
1791 return true;
1792 } else {
1793 return false;
1794 }
1795 }
1796
1797 #if INCLUDE_CDS_JAVA_HEAP
1798 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1799 // The closed and open archive heap space has maximum two regions.
1800 // See FileMapInfo::write_archive_heap_regions() for details.
1801 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
1802 _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
1803 HeapShared::archive_java_heap_objects(_closed_archive_heap_regions,
1804 _open_archive_heap_regions);
1805 ArchiveCompactor::OtherROAllocMark mark;
1806 HeapShared::write_subgraph_info_table();
1807 }
1808
1809 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
1810 if (HeapShared::is_heap_object_archiving_allowed()) {
1811 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1812 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
1813
1814 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
1815 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
1816 }
1817 }
1818
1819 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
1820 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
1821 for (int i=0; i<regions->length(); i++) {
1822 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
1823 size_t size_in_bits = oopmap.size();
1824 size_t size_in_bytes = oopmap.size_in_bytes();
1825 uintptr_t* buffer = (uintptr_t*)_ro_region.allocate(size_in_bytes, sizeof(intptr_t));
1826 oopmap.write_to(buffer, size_in_bytes);
1827 log_info(cds)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region "
1828 INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)",
1829 p2i(buffer), size_in_bytes,
1830 p2i(regions->at(i).start()), regions->at(i).byte_size());
1831
1832 ArchiveHeapOopmapInfo info;
1833 info._oopmap = (address)buffer;
1834 info._oopmap_size_in_bits = size_in_bits;
1835 oopmaps->append(info);
1836 }
1837 }
1838 #endif // INCLUDE_CDS_JAVA_HEAP
1839
1840 // Closure for serializing initialization data in from a data area
1841 // (ptr_array) read from the shared file.
1842
1843 class ReadClosure : public SerializeClosure {
1844 private:
1845 intptr_t** _ptr_array;
1846
1847 inline intptr_t nextPtr() {
1848 return *(*_ptr_array)++;
1849 }
1850
1851 public:
1852 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
1853
1854 void do_ptr(void** p) {
1855 assert(*p == NULL, "initializing previous initialized pointer.");
1856 intptr_t obj = nextPtr();
1857 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1858 "hit tag while initializing ptrs.");
1859 *p = (void*)obj;
1860 }
1861
1862 void do_u4(u4* p) {
1863 intptr_t obj = nextPtr();
1864 *p = (u4)(uintx(obj));
1865 }
1866
1867 void do_tag(int tag) {
1868 int old_tag;
1869 old_tag = (int)(intptr_t)nextPtr();
1870 // do_int(&old_tag);
1871 assert(tag == old_tag, "old tag doesn't match");
1872 FileMapInfo::assert_mark(tag == old_tag);
1873 }
1874
1875 void do_oop(oop *p) {
1876 narrowOop o = (narrowOop)nextPtr();
1877 if (o == 0 || !HeapShared::open_archive_heap_region_mapped()) {
1878 p = NULL;
1879 } else {
1880 assert(HeapShared::is_heap_object_archiving_allowed(),
1881 "Archived heap object is not allowed");
1882 assert(HeapShared::open_archive_heap_region_mapped(),
1883 "Open archive heap region is not mapped");
1884 *p = HeapShared::decode_from_archive(o);
1885 }
1886 }
1887
1888 void do_region(u_char* start, size_t size) {
1889 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
1890 assert(size % sizeof(intptr_t) == 0, "bad size");
1891 do_tag((int)size);
1892 while (size > 0) {
1893 *(intptr_t*)start = nextPtr();
1894 start += sizeof(intptr_t);
1895 size -= sizeof(intptr_t);
1896 }
1897 }
1898
1899 bool reading() const { return true; }
1900 };
1901
1902 // Return true if given address is in the misc data region
1903 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
1904 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
1905 }
1906
1907 bool MetaspaceShared::is_in_trampoline_frame(address addr) {
1908 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
1909 return true;
1910 }
1911 return false;
1912 }
1913
1914 // Map shared spaces at requested addresses and return if succeeded.
1915 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
1916 size_t image_alignment = mapinfo->alignment();
1917
1918 #ifndef _WINDOWS
1919 // Map in the shared memory and then map the regions on top of it.
1920 // On Windows, don't map the memory here because it will cause the
1921 // mappings of the regions to fail.
1922 ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
1923 if (!shared_rs.is_reserved()) return false;
1924 #endif
1925
1926 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
1927
1928 char* ro_base = NULL; char* ro_top;
1929 char* rw_base = NULL; char* rw_top;
1930 char* mc_base = NULL; char* mc_top;
1931 char* md_base = NULL; char* md_top;
1932 char* od_base = NULL; char* od_top;
1933
1934 // Map each shared region
1935 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL &&
1936 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL &&
1937 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL &&
1938 (md_base = mapinfo->map_region(md, &md_top)) != NULL &&
1939 (od_base = mapinfo->map_region(od, &od_top)) != NULL &&
1940 (image_alignment == (size_t)os::vm_allocation_granularity()) &&
1941 mapinfo->validate_shared_path_table()) {
1942 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for
1943 // fast checking in MetaspaceShared::is_in_shared_metaspace() and
1944 // MetaspaceObj::is_shared().
1945 //
1946 // We require that mc->rw->ro->md->od to be laid out consecutively, with no
1947 // gaps between them. That way, we can ensure that the OS won't be able to
1948 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which
1949 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace().
1950 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be");
1951 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be");
1952 assert(mc_top == rw_base, "must be");
1953 assert(rw_top == ro_base, "must be");
1954 assert(ro_top == md_base, "must be");
1955 assert(md_top == od_base, "must be");
1956
1957 MetaspaceObj::set_shared_metaspace_range((void*)mc_base, (void*)od_top);
1958 return true;
1959 } else {
1960 // If there was a failure in mapping any of the spaces, unmap the ones
1961 // that succeeded
1962 if (ro_base != NULL) mapinfo->unmap_region(ro);
1963 if (rw_base != NULL) mapinfo->unmap_region(rw);
1964 if (mc_base != NULL) mapinfo->unmap_region(mc);
1965 if (md_base != NULL) mapinfo->unmap_region(md);
1966 if (od_base != NULL) mapinfo->unmap_region(od);
1967 #ifndef _WINDOWS
1968 // Release the entire mapped region
1969 shared_rs.release();
1970 #endif
1971 // If -Xshare:on is specified, print out the error message and exit VM,
1972 // otherwise, set UseSharedSpaces to false and continue.
1973 if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
1974 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
1975 } else {
1976 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1977 }
1978 return false;
1979 }
1980 }
1981
1982 // Read the miscellaneous data from the shared file, and
1983 // serialize it out to its various destinations.
1984
1985 void MetaspaceShared::initialize_shared_spaces() {
1986 FileMapInfo *mapinfo = FileMapInfo::current_info();
1987 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
1988 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
1989 _core_spaces_size = mapinfo->core_spaces_size();
1990 char* buffer = mapinfo->misc_data_patching_start();
1991 clone_cpp_vtables((intptr_t*)buffer);
1992
1993 // The rest of the data is now stored in the RW region
1994 buffer = mapinfo->read_only_tables_start();
1995 int sharedDictionaryLen = *(intptr_t*)buffer;
1996 buffer += sizeof(intptr_t);
1997 int number_of_entries = *(intptr_t*)buffer;
1998 buffer += sizeof(intptr_t);
1999 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
2000 sharedDictionaryLen,
2001 number_of_entries);
2002 buffer += sharedDictionaryLen;
2003
2004 // The following data are the linked list elements
2005 // (HashtableEntry objects) for the shared dictionary table.
2006
2007 int len = *(intptr_t*)buffer; // skip over shared dictionary entries
2008 buffer += sizeof(intptr_t);
2009 buffer += len;
2010
2011 // Verify various attributes of the archive, plus initialize the
2012 // shared string/symbol tables
2013 intptr_t* array = (intptr_t*)buffer;
2014 ReadClosure rc(&array);
2015 serialize(&rc);
2016
2017 // Initialize the run-time symbol table.
2018 SymbolTable::create_table();
2019
2020 mapinfo->patch_archived_heap_embedded_pointers();
2021
2022 // Close the mapinfo file
2023 mapinfo->close();
2024
2025 if (PrintSharedArchiveAndExit) {
2026 if (PrintSharedDictionary) {
2027 tty->print_cr("\nShared classes:\n");
2028 SystemDictionary::print_shared(tty);
2029 }
2030 if (_archive_loading_failed) {
2031 tty->print_cr("archive is invalid");
2032 vm_exit(1);
2033 } else {
2034 tty->print_cr("archive is valid");
2035 vm_exit(0);
2036 }
2037 }
2038 }
2039
2040 // JVM/TI RedefineClasses() support:
2041 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2042 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2043
2044 if (UseSharedSpaces) {
2045 // remap the shared readonly space to shared readwrite, private
2046 FileMapInfo* mapinfo = FileMapInfo::current_info();
2047 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2048 return false;
2049 }
2050 _remapped_readwrite = true;
2051 }
2052 return true;
2053 }
2054
2055 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
2056 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
2057 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
2058 // or so.
2059 _mc_region.print_out_of_space_msg(name, needed_bytes);
2060 _rw_region.print_out_of_space_msg(name, needed_bytes);
2061 _ro_region.print_out_of_space_msg(name, needed_bytes);
2062 _md_region.print_out_of_space_msg(name, needed_bytes);
2063 _od_region.print_out_of_space_msg(name, needed_bytes);
2064
2065 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
2066 "Please reduce the number of shared classes.");
2067 }