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