1 /*
2 * Copyright (c) 2012, 2024, 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 "cds/aotClassInitializer.hpp"
27 #include "cds/aotClassLinker.hpp"
28 #include "cds/aotConstantPoolResolver.hpp"
29 #include "cds/aotLinkedClassBulkLoader.hpp"
30 #include "cds/archiveBuilder.hpp"
31 #include "cds/archiveHeapLoader.hpp"
32 #include "cds/archiveHeapWriter.hpp"
33 #include "cds/cds_globals.hpp"
34 #include "cds/cdsAccess.hpp"
35 #include "cds/cdsConfig.hpp"
36 #include "cds/cdsProtectionDomain.hpp"
37 #include "cds/cds_globals.hpp"
38 #include "cds/classListParser.hpp"
39 #include "cds/classListWriter.hpp"
40 #include "cds/cppVtables.hpp"
41 #include "cds/dumpAllocStats.hpp"
42 #include "cds/dynamicArchive.hpp"
43 #include "cds/filemap.hpp"
44 #include "cds/finalImageRecipes.hpp"
45 #include "cds/heapShared.hpp"
46 #include "cds/lambdaFormInvokers.hpp"
47 #include "cds/metaspaceShared.hpp"
48 #include "classfile/classLoaderDataGraph.hpp"
49 #include "classfile/classLoaderDataShared.hpp"
50 #include "classfile/classLoaderExt.hpp"
51 #include "classfile/javaClasses.inline.hpp"
52 #include "classfile/loaderConstraints.hpp"
53 #include "classfile/modules.hpp"
54 #include "classfile/placeholders.hpp"
55 #include "classfile/stringTable.hpp"
56 #include "classfile/symbolTable.hpp"
57 #include "classfile/systemDictionary.hpp"
58 #include "classfile/systemDictionaryShared.hpp"
59 #include "classfile/vmClasses.hpp"
60 #include "classfile/vmSymbols.hpp"
61 #include "code/codeCache.hpp"
62 #include "code/SCCache.hpp"
63 #include "compiler/compileBroker.hpp"
64 #include "compiler/precompiler.hpp"
65 #include "gc/shared/gcVMOperations.hpp"
66 #include "interpreter/bytecodeStream.hpp"
67 #include "interpreter/bytecodes.hpp"
68 #include "jvm_io.h"
69 #include "logging/log.hpp"
70 #include "logging/logMessage.hpp"
71 #include "logging/logStream.hpp"
72 #include "memory/metaspace.hpp"
73 #include "memory/metaspaceClosure.hpp"
74 #include "memory/resourceArea.hpp"
75 #include "memory/universe.hpp"
76 #include "nmt/memTracker.hpp"
77 #include "oops/compressedKlass.hpp"
78 #include "oops/instanceMirrorKlass.hpp"
79 #include "oops/klass.inline.hpp"
80 #include "oops/method.inline.hpp"
81 #include "oops/objArrayOop.hpp"
82 #include "oops/oop.inline.hpp"
83 #include "oops/oopHandle.hpp"
84 #include "oops/trainingData.hpp"
85 #include "prims/jvmtiExport.hpp"
86 #include "prims/whitebox.hpp"
87 #include "runtime/arguments.hpp"
88 #include "runtime/globals.hpp"
89 #include "runtime/globals_extension.hpp"
90 #include "runtime/handles.inline.hpp"
91 #include "runtime/javaCalls.hpp"
92 #include "runtime/os.inline.hpp"
93 #include "runtime/safepointVerifiers.hpp"
94 #include "runtime/sharedRuntime.hpp"
95 #include "runtime/vmOperations.hpp"
96 #include "runtime/vmThread.hpp"
97 #include "sanitizers/leak.hpp"
98 #include "utilities/align.hpp"
99 #include "utilities/bitMap.inline.hpp"
100 #include "utilities/defaultStream.hpp"
101 #include "utilities/ostream.hpp"
102 #include "utilities/resourceHash.hpp"
103
104 ReservedSpace MetaspaceShared::_symbol_rs;
105 VirtualSpace MetaspaceShared::_symbol_vs;
106 bool MetaspaceShared::_archive_loading_failed = false;
107 bool MetaspaceShared::_remapped_readwrite = false;
108 void* MetaspaceShared::_shared_metaspace_static_top = nullptr;
109 intx MetaspaceShared::_relocation_delta;
110 char* MetaspaceShared::_requested_base_address;
111 Array<Method*>* MetaspaceShared::_archived_method_handle_intrinsics = nullptr;
112 bool MetaspaceShared::_use_optimized_module_handling = true;
113
114 // The CDS archive is divided into the following regions:
115 // rw - read-write metadata
116 // ro - read-only metadata and read-only tables
117 // hp - heap region
118 // bm - bitmap for relocating the above 7 regions.
119 //
120 // The rw and ro regions are linearly allocated, in the order of rw->ro.
121 // These regions are aligned with MetaspaceShared::core_region_alignment().
122 //
123 // These 2 regions are populated in the following steps:
124 // [0] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
125 // temporarily allocated outside of the shared regions.
126 // [1] We enter a safepoint and allocate a buffer for the rw/ro regions.
127 // [2] C++ vtables are copied into the rw region.
128 // [3] ArchiveBuilder copies RW metadata into the rw region.
129 // [4] ArchiveBuilder copies RO metadata into the ro region.
130 // [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
131 // are copied into the ro region as read-only tables.
132 //
133 // The heap region is populated by HeapShared::archive_objects.
134 //
135 // The bitmap region is used to relocate the ro/rw/hp regions.
136
137 static DumpRegion _symbol_region("symbols");
138
139 char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
140 return _symbol_region.allocate(num_bytes);
141 }
142
143 // os::vm_allocation_granularity() is usually 4K for most OSes. However, some platforms
144 // such as linux-aarch64 and macos-x64 ...
145 // it can be either 4K or 64K and on macos-aarch64 it is 16K. To generate archives that are
146 // compatible for both settings, an alternative cds core region alignment can be enabled
147 // at building time:
148 // --enable-compactible-cds-alignment
149 // Upon successful configuration, the compactible alignment then can be defined in:
150 // os_linux_aarch64.cpp
151 // os_bsd_x86.cpp
152 size_t MetaspaceShared::core_region_alignment() {
153 return os::cds_core_region_alignment();
154 }
155
156 static bool shared_base_valid(char* shared_base) {
157 // We check user input for SharedBaseAddress at dump time. We must weed out values
158 // we already know to be invalid later.
159
160 // At CDS runtime, "shared_base" will be the (attempted) mapping start. It will also
161 // be the encoding base, since the the headers of archived base objects (and with Lilliput,
162 // the prototype mark words) carry pre-computed narrow Klass IDs that refer to the mapping
163 // start as base.
164 //
165 // Therefore, "shared_base" must be later usable as encoding base.
166 return AARCH64_ONLY(is_aligned(shared_base, 4 * G)) NOT_AARCH64(true);
167 }
168
169 class DumpClassListCLDClosure : public CLDClosure {
170 static const int INITIAL_TABLE_SIZE = 1987;
171 static const int MAX_TABLE_SIZE = 61333;
172
173 fileStream *_stream;
174 ResizeableResourceHashtable<InstanceKlass*, bool,
175 AnyObj::C_HEAP, mtClassShared> _dumped_classes;
176
177 void dump(InstanceKlass* ik) {
178 bool created;
179 _dumped_classes.put_if_absent(ik, &created);
180 if (!created) {
181 return;
182 }
183 if (_dumped_classes.maybe_grow()) {
184 log_info(cds, hashtables)("Expanded _dumped_classes table to %d", _dumped_classes.table_size());
185 }
186 if (ik->java_super()) {
187 dump(ik->java_super());
188 }
189 Array<InstanceKlass*>* interfaces = ik->local_interfaces();
190 int len = interfaces->length();
191 for (int i = 0; i < len; i++) {
192 dump(interfaces->at(i));
193 }
194 ClassListWriter::write_to_stream(ik, _stream);
195 }
196
197 public:
198 DumpClassListCLDClosure(fileStream* f)
199 : CLDClosure(), _dumped_classes(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE) {
200 _stream = f;
201 }
202
203 void do_cld(ClassLoaderData* cld) {
204 for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
205 if (klass->is_instance_klass()) {
206 dump(InstanceKlass::cast(klass));
207 }
208 }
209 }
210 };
211
212 void MetaspaceShared::dump_loaded_classes(const char* file_name, TRAPS) {
213 fileStream stream(file_name, "w");
214 if (stream.is_open()) {
215 MutexLocker lock(ClassLoaderDataGraph_lock);
216 MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
217 DumpClassListCLDClosure collect_classes(&stream);
218 ClassLoaderDataGraph::loaded_cld_do(&collect_classes);
219 } else {
220 THROW_MSG(vmSymbols::java_io_IOException(), "Failed to open file");
221 }
222 }
223
224 static bool shared_base_too_high(char* specified_base, char* aligned_base, size_t cds_max) {
225 if (specified_base != nullptr && aligned_base < specified_base) {
226 // SharedBaseAddress is very high (e.g., 0xffffffffffffff00) so
227 // align_up(SharedBaseAddress, MetaspaceShared::core_region_alignment()) has wrapped around.
228 return true;
229 }
230 if (max_uintx - uintx(aligned_base) < uintx(cds_max)) {
231 // The end of the archive will wrap around
232 return true;
233 }
234
235 return false;
236 }
237
238 static char* compute_shared_base(size_t cds_max) {
239 char* specified_base = (char*)SharedBaseAddress;
240 char* aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
241 if (UseCompressedClassPointers) {
242 aligned_base = align_up(specified_base, Metaspace::reserve_alignment());
243 }
244
245 if (aligned_base != specified_base) {
246 log_info(cds)("SharedBaseAddress (" INTPTR_FORMAT ") aligned up to " INTPTR_FORMAT,
247 p2i(specified_base), p2i(aligned_base));
248 }
249
250 const char* err = nullptr;
251 if (shared_base_too_high(specified_base, aligned_base, cds_max)) {
252 err = "too high";
253 } else if (!shared_base_valid(aligned_base)) {
254 err = "invalid for this platform";
255 } else {
256 return aligned_base;
257 }
258
259 log_warning(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
260 p2i((void*)SharedBaseAddress), err,
261 p2i((void*)Arguments::default_SharedBaseAddress()));
262
263 specified_base = (char*)Arguments::default_SharedBaseAddress();
264 aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
265
266 // Make sure the default value of SharedBaseAddress specified in globals.hpp is sane.
267 assert(!shared_base_too_high(specified_base, aligned_base, cds_max), "Sanity");
268 assert(shared_base_valid(aligned_base), "Sanity");
269 return aligned_base;
270 }
271
272 void MetaspaceShared::initialize_for_static_dump() {
273 assert(CDSConfig::is_dumping_static_archive(), "sanity");
274
275 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_final_static_archive()) {
276 if (!((UseG1GC || UseParallelGC || UseSerialGC || UseEpsilonGC) && UseCompressedClassPointers)) {
277 vm_exit_during_initialization("Cannot create the CacheDataStore",
278 "UseCompressedClassPointers must be enabled, and collector must be G1, Parallel, Serial, or Epsilon");
279 }
280 }
281
282 log_info(cds)("Core region alignment: " SIZE_FORMAT, core_region_alignment());
283 // The max allowed size for CDS archive. We use this to limit SharedBaseAddress
284 // to avoid address space wrap around.
285 size_t cds_max;
286 const size_t reserve_alignment = core_region_alignment();
287
288 #ifdef _LP64
289 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
290 cds_max = align_down(UnscaledClassSpaceMax, reserve_alignment);
291 #else
292 // We don't support archives larger than 256MB on 32-bit due to limited
293 // virtual address space.
294 cds_max = align_down(256*M, reserve_alignment);
295 #endif
296
297 _requested_base_address = compute_shared_base(cds_max);
298 SharedBaseAddress = (size_t)_requested_base_address;
299
300 size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
301 _symbol_rs = ReservedSpace(symbol_rs_size);
302 if (!_symbol_rs.is_reserved()) {
303 log_error(cds)("Unable to reserve memory for symbols: " SIZE_FORMAT " bytes.", symbol_rs_size);
304 MetaspaceShared::unrecoverable_writing_error();
305 }
306 _symbol_region.init(&_symbol_rs, &_symbol_vs);
307 }
308
309 // Called by universe_post_init()
310 void MetaspaceShared::post_initialize(TRAPS) {
311 if (CDSConfig::is_using_archive()) {
312 int size = FileMapInfo::get_number_of_shared_paths();
313 if (size > 0) {
314 CDSProtectionDomain::allocate_shared_data_arrays(size, CHECK);
315 if (!CDSConfig::is_dumping_dynamic_archive()) {
316 FileMapInfo* info;
317 if (FileMapInfo::dynamic_info() == nullptr) {
318 info = FileMapInfo::current_info();
319 } else {
320 info = FileMapInfo::dynamic_info();
321 }
322 ClassLoaderExt::init_paths_start_index(info->app_class_paths_start_index());
323 ClassLoaderExt::init_app_module_paths_start_index(info->app_module_paths_start_index());
324 }
325 }
326 }
327 }
328
329 static GrowableArrayCHeap<OopHandle, mtClassShared>* _extra_interned_strings = nullptr;
330 static GrowableArrayCHeap<Symbol*, mtClassShared>* _extra_symbols = nullptr;
331 static GrowableArray<Method*>* _method_handle_intrinsics = nullptr;
332
333 void MetaspaceShared::read_extra_data(JavaThread* current, const char* filename) {
334 _extra_interned_strings = new GrowableArrayCHeap<OopHandle, mtClassShared>(10000);
335 _extra_symbols = new GrowableArrayCHeap<Symbol*, mtClassShared>(1000);
336
337 HashtableTextDump reader(filename);
338 reader.check_version("VERSION: 1.0");
339
340 while (reader.remain() > 0) {
341 int utf8_length;
342 int prefix_type = reader.scan_prefix(&utf8_length);
343 ResourceMark rm(current);
344 if (utf8_length == 0x7fffffff) {
345 // buf_len will overflown 32-bit value.
346 log_error(cds)("string length too large: %d", utf8_length);
347 MetaspaceShared::unrecoverable_loading_error();
348 }
349 int buf_len = utf8_length+1;
350 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
351 reader.get_utf8(utf8_buffer, utf8_length);
352 utf8_buffer[utf8_length] = '\0';
353
354 if (prefix_type == HashtableTextDump::SymbolPrefix) {
355 _extra_symbols->append(SymbolTable::new_permanent_symbol(utf8_buffer));
356 } else{
357 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
358 ExceptionMark em(current);
359 JavaThread* THREAD = current; // For exception macros.
360 oop str = StringTable::intern(utf8_buffer, THREAD);
361
362 if (HAS_PENDING_EXCEPTION) {
363 log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
364 reader.last_line_no(), utf8_length);
365 CLEAR_PENDING_EXCEPTION;
366 } else {
367 #if INCLUDE_CDS_JAVA_HEAP
368 if (ArchiveHeapWriter::is_string_too_large_to_archive(str)) {
369 log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
370 reader.last_line_no(), utf8_length);
371 continue;
372 }
373 // Make sure this string is included in the dumped interned string table.
374 assert(str != nullptr, "must succeed");
375 _extra_interned_strings->append(OopHandle(Universe::vm_global(), str));
376 #endif
377 }
378 }
379 }
380 }
381
382 void MetaspaceShared::make_method_handle_intrinsics_shareable() {
383 for (int i = 0; i < _method_handle_intrinsics->length(); i++) {
384 Method* m = ArchiveBuilder::current()->get_buffered_addr(_method_handle_intrinsics->at(i));
385 m->remove_unshareable_info();
386 // Each method has its own constant pool (which is distinct from m->method_holder()->constants());
387 m->constants()->remove_unshareable_info();
388 }
389 }
390
391 void MetaspaceShared::write_method_handle_intrinsics() {
392 int len = _method_handle_intrinsics->length();
393 _archived_method_handle_intrinsics = ArchiveBuilder::new_ro_array<Method*>(len);
394 for (int i = 0; i < len; i++) {
395 ArchiveBuilder::current()->write_pointer_in_buffer(_archived_method_handle_intrinsics->adr_at(i),
396 _method_handle_intrinsics->at(i));
397 }
398 log_info(cds)("Archived %d method handle intrinsics", len);
399 }
400
401 // Read/write a data stream for restoring/preserving metadata pointers and
402 // miscellaneous data from/to the shared archive file.
403
404 void MetaspaceShared::serialize(SerializeClosure* soc) {
405 int tag = 0;
406 soc->do_tag(--tag);
407
408 // Verify the sizes of various metadata in the system.
409 soc->do_tag(sizeof(Method));
410 soc->do_tag(sizeof(ConstMethod));
411 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
412 soc->do_tag(sizeof(ConstantPool));
413 soc->do_tag(sizeof(ConstantPoolCache));
414 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
415 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
416 soc->do_tag(sizeof(Symbol));
417
418 // Need to do this first, as subsequent steps may call virtual functions
419 // in archived Metadata objects.
420 CppVtables::serialize(soc);
421 soc->do_tag(--tag);
422
423 // Dump/restore miscellaneous metadata.
424 JavaClasses::serialize_offsets(soc);
425 HeapShared::serialize_misc_info(soc);
426 Universe::serialize(soc);
427 soc->do_tag(--tag);
428
429 // Dump/restore references to commonly used names and signatures.
430 vmSymbols::serialize(soc);
431 soc->do_tag(--tag);
432
433 // Dump/restore the symbol/string/subgraph_info tables
434 SymbolTable::serialize_shared_table_header(soc);
435 StringTable::serialize_shared_table_header(soc);
436 HeapShared::serialize_tables(soc);
437 SystemDictionaryShared::serialize_dictionary_headers(soc);
438 AOTLinkedClassBulkLoader::serialize(soc, true);
439 FinalImageRecipes::serialize(soc, true);
440 TrainingData::serialize_training_data(soc);
441 InstanceMirrorKlass::serialize_offsets(soc);
442
443 // Dump/restore well known classes (pointers)
444 SystemDictionaryShared::serialize_vm_classes(soc);
445 soc->do_tag(--tag);
446
447 CDS_JAVA_HEAP_ONLY(Modules::serialize(soc);)
448 CDS_JAVA_HEAP_ONLY(ClassLoaderDataShared::serialize(soc);)
449 soc->do_ptr((void**)&_archived_method_handle_intrinsics);
450
451
452 LambdaFormInvokers::serialize(soc);
453 soc->do_tag(666);
454 }
455
456 static void rewrite_nofast_bytecode(const methodHandle& method) {
457 BytecodeStream bcs(method);
458 while (!bcs.is_last_bytecode()) {
459 Bytecodes::Code opcode = bcs.next();
460 switch (opcode) {
461 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
462 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
463 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
464 case Bytecodes::_iload: {
465 if (!bcs.is_wide()) {
466 *bcs.bcp() = Bytecodes::_nofast_iload;
467 }
468 break;
469 }
470 default: break;
471 }
472 }
473 }
474
475 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
476 // at run time by RewriteBytecodes/RewriteFrequentPairs
477 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
478 void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
479 for (int i = 0; i < ik->methods()->length(); i++) {
480 methodHandle m(thread, ik->methods()->at(i));
481 if (ik->can_be_verified_at_dumptime() && ik->is_linked()) {
482 rewrite_nofast_bytecode(m);
483 }
484 Fingerprinter fp(m);
485 // The side effect of this call sets method's fingerprint field.
486 fp.fingerprint();
487 }
488 }
489
490 class VM_PopulateDumpSharedSpace : public VM_Operation {
491 private:
492 ArchiveHeapInfo _heap_info;
493 FileMapInfo* _map_info;
494 StaticArchiveBuilder& _builder;
495
496 void dump_java_heap_objects(GrowableArray<Klass*>* klasses) NOT_CDS_JAVA_HEAP_RETURN;
497 void dump_shared_symbol_table(GrowableArray<Symbol*>* symbols) {
498 log_info(cds)("Dumping symbol table ...");
499 SymbolTable::write_to_archive(symbols);
500 }
501 char* dump_read_only_tables();
502
503 public:
504
505 VM_PopulateDumpSharedSpace(StaticArchiveBuilder& b) :
506 VM_Operation(), _heap_info(), _map_info(nullptr), _builder(b) {}
507
508 bool skip_operation() const { return false; }
509
510 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
511 ArchiveHeapInfo* heap_info() { return &_heap_info; }
512 FileMapInfo* map_info() const { return _map_info; }
513 void doit(); // outline because gdb sucks
514 bool allow_nested_vm_operations() const { return true; }
515 }; // class VM_PopulateDumpSharedSpace
516
517 class StaticArchiveBuilder : public ArchiveBuilder {
518 public:
519 StaticArchiveBuilder() : ArchiveBuilder() {}
520
521 virtual void iterate_roots(MetaspaceClosure* it) {
522 FileMapInfo::metaspace_pointers_do(it);
523 SystemDictionaryShared::dumptime_classes_do(it);
524 Universe::metaspace_pointers_do(it);
525 vmSymbols::metaspace_pointers_do(it);
526 TrainingData::iterate_roots(it);
527
528 // The above code should find all the symbols that are referenced by the
529 // archived classes. We just need to add the extra symbols which
530 // may not be used by any of the archived classes -- these are usually
531 // symbols that we anticipate to be used at run time, so we can store
532 // them in the RO region, to be shared across multiple processes.
533 if (_extra_symbols != nullptr) {
534 for (int i = 0; i < _extra_symbols->length(); i++) {
535 it->push(_extra_symbols->adr_at(i));
536 }
537 }
538
539 for (int i = 0; i < _method_handle_intrinsics->length(); i++) {
540 it->push(_method_handle_intrinsics->adr_at(i));
541 }
542 }
543 };
544
545 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
546 ArchiveBuilder::OtherROAllocMark mark;
547
548 SystemDictionaryShared::write_to_archive();
549 AOTClassLinker::write_to_archive();
550 if (CDSConfig::is_dumping_preimage_static_archive()) {
551 FinalImageRecipes::record_recipes();
552 }
553 AOTLinkedClassBulkLoader::record_unregistered_classes();
554 TrainingData::dump_training_data();
555 MetaspaceShared::write_method_handle_intrinsics();
556
557 // Write lambform lines into archive
558 LambdaFormInvokers::dump_static_archive_invokers();
559 // Write module name into archive
560 CDS_JAVA_HEAP_ONLY(Modules::dump_main_module_name();)
561 // Write the other data to the output array.
562 DumpRegion* ro_region = ArchiveBuilder::current()->ro_region();
563 char* start = ro_region->top();
564 WriteClosure wc(ro_region);
565 MetaspaceShared::serialize(&wc);
566
567 return start;
568 }
569
570 void VM_PopulateDumpSharedSpace::doit() {
571 //guarantee(!CDSConfig::is_using_archive(), "We should not be using an archive when we dump");
572
573 DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
574
575 FileMapInfo::check_nonempty_dir_in_shared_path_table();
576
577 NOT_PRODUCT(SystemDictionary::verify();)
578
579 // Block concurrent class unloading from changing the _dumptime_table
580 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
581
582 HeapShared::start_finding_archivable_hidden_classes();
583 SystemDictionaryShared::check_excluded_classes();
584 HeapShared::end_finding_archivable_hidden_classes();
585
586 _builder.gather_source_objs();
587 _builder.reserve_buffer();
588
589 CppVtables::dumptime_init(&_builder);
590
591 _builder.sort_metadata_objs();
592 _builder.dump_rw_metadata();
593 _builder.dump_ro_metadata();
594 _builder.relocate_metaspaceobj_embedded_pointers();
595
596 dump_java_heap_objects(_builder.klasses());
597 dump_shared_symbol_table(_builder.symbols());
598
599 log_info(cds)("Make classes shareable");
600 _builder.make_klasses_shareable();
601 MetaspaceShared::make_method_handle_intrinsics_shareable();
602
603 char* serialized_data = dump_read_only_tables();
604
605 SystemDictionaryShared::adjust_lambda_proxy_class_dictionary();
606
607 log_info(cds)("Adjust method info dictionary");
608 SystemDictionaryShared::adjust_method_info_dictionary();
609
610 log_info(cds)("Make training data shareable");
611 _builder.make_training_data_shareable();
612
613 // The vtable clones contain addresses of the current process.
614 // We don't want to write these addresses into the archive.
615 CppVtables::zero_archived_vtables();
616
617 // Write the archive file
618 const char* static_archive;
619 if (CDSConfig::is_dumping_final_static_archive()) {
620 static_archive = CacheDataStore;
621 assert(FileMapInfo::current_info() != nullptr, "sanity");
622 delete FileMapInfo::current_info();
623 } else {
624 static_archive = CDSConfig::static_archive_path();
625 }
626 assert(static_archive != nullptr, "SharedArchiveFile not set?");
627 _map_info = new FileMapInfo(static_archive, true);
628 _map_info->populate_header(MetaspaceShared::core_region_alignment());
629 _map_info->set_serialized_data(serialized_data);
630 _map_info->set_cloned_vtables(CppVtables::vtables_serialized_base());
631 }
632
633 class CollectCLDClosure : public CLDClosure {
634 GrowableArray<ClassLoaderData*> _loaded_cld;
635 GrowableArray<OopHandle> _loaded_cld_handles; // keep the CLDs alive
636 Thread* _current_thread;
637 public:
638 CollectCLDClosure(Thread* thread) : _current_thread(thread) {}
639 ~CollectCLDClosure() {
640 for (int i = 0; i < _loaded_cld_handles.length(); i++) {
641 _loaded_cld_handles.at(i).release(Universe::vm_global());
642 }
643 }
644 void do_cld(ClassLoaderData* cld) {
645 assert(cld->is_alive(), "must be");
646 _loaded_cld.append(cld);
647 _loaded_cld_handles.append(OopHandle(Universe::vm_global(), cld->holder()));
648 }
649
650 int nof_cld() const { return _loaded_cld.length(); }
651 ClassLoaderData* cld_at(int index) { return _loaded_cld.at(index); }
652 };
653
654 // Check if we can eagerly link this class at dump time, so we can avoid the
655 // runtime linking overhead (especially verification)
656 bool MetaspaceShared::may_be_eagerly_linked(InstanceKlass* ik) {
657 if (CDSConfig::preserve_all_dumptime_verification_states(ik)) {
658 assert(ik->can_be_verified_at_dumptime(), "sanity");
659 }
660 if (!ik->can_be_verified_at_dumptime()) {
661 // For old classes, try to leave them in the unlinked state, so
662 // we can still store them in the archive. They must be
663 // linked/verified at runtime.
664 return false;
665 }
666
667 if (CDSConfig::is_dumping_dynamic_archive() && ik->is_shared_unregistered_class()) {
668 // Linking of unregistered classes at this stage may cause more
669 // classes to be resolved, resulting in calls to ClassLoader.loadClass()
670 // that may not be expected by custom class loaders.
671 //
672 // It's OK to do this for the built-in loaders as we know they can
673 // tolerate this.
674 return false;
675 }
676 return true;
677 }
678
679 void MetaspaceShared::link_shared_classes(bool jcmd_request, TRAPS) {
680 AOTClassLinker::initialize();
681
682 if (!jcmd_request && !CDSConfig::is_dumping_dynamic_archive()
683 && !CDSConfig::is_dumping_preimage_static_archive()
684 && !CDSConfig::is_dumping_final_static_archive()) {
685 // If we have regenerated invoker classes in the dynamic archive,
686 // they will conflict with the resolved CONSTANT_Klass references that are stored
687 // in the static archive. This is not easy to handle. Let's disable
688 // it for dynamic archive for now.
689 LambdaFormInvokers::regenerate_holder_classes(CHECK);
690 }
691
692 // Collect all loaded ClassLoaderData.
693 CollectCLDClosure collect_cld(THREAD);
694 {
695 // ClassLoaderDataGraph::loaded_cld_do requires ClassLoaderDataGraph_lock.
696 // We cannot link the classes while holding this lock (or else we may run into deadlock).
697 // Therefore, we need to first collect all the CLDs, and then link their classes after
698 // releasing the lock.
699 MutexLocker lock(ClassLoaderDataGraph_lock);
700 ClassLoaderDataGraph::loaded_cld_do(&collect_cld);
701 }
702
703 while (true) {
704 bool has_linked = false;
705 for (int i = 0; i < collect_cld.nof_cld(); i++) {
706 ClassLoaderData* cld = collect_cld.cld_at(i);
707 for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
708 if (klass->is_instance_klass()) {
709 InstanceKlass* ik = InstanceKlass::cast(klass);
710 if (may_be_eagerly_linked(ik)) {
711 has_linked |= try_link_class(THREAD, ik);
712 }
713 if (CDSConfig::is_dumping_heap() && ik->is_linked() && !ik->is_initialized()) {
714 AOTClassInitializer::maybe_preinit_class(ik, CHECK);
715 }
716 }
717 }
718 }
719
720 if (!has_linked) {
721 break;
722 }
723 // Class linking includes verification which may load more classes.
724 // Keep scanning until we have linked no more classes.
725 }
726
727 // Resolve constant pool entries -- we don't load any new classes during this stage
728 for (int i = 0; i < collect_cld.nof_cld(); i++) {
729 ClassLoaderData* cld = collect_cld.cld_at(i);
730 for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
731 if (klass->is_instance_klass()) {
732 InstanceKlass* ik = InstanceKlass::cast(klass);
733 AOTConstantPoolResolver::dumptime_resolve_constants(ik, CHECK);
734 if (CDSConfig::is_dumping_preimage_static_archive()) {
735 FinalImageRecipes::add_reflection_data_flags(ik, CHECK);
736 }
737 }
738 }
739 }
740
741 if (CDSConfig::is_dumping_preimage_static_archive()) {
742 // Do this after all classes are verified by the above loop.
743 // Any classes loaded from here on will be automatically excluded, so
744 // there's no need to force verification or resolve CP entries.
745 RecordTraining = false;
746 SystemDictionaryShared::ignore_new_classes();
747 LambdaFormInvokers::regenerate_holder_classes(CHECK);
748 RecordTraining = true;
749 }
750
751 if (CDSConfig::is_dumping_final_static_archive()) {
752 FinalImageRecipes::apply_recipes(CHECK);
753 }
754 }
755
756 void MetaspaceShared::prepare_for_dumping() {
757 assert(CDSConfig::is_dumping_archive(), "sanity");
758 CDSConfig::check_unsupported_dumping_module_options();
759 ClassLoader::initialize_shared_path(JavaThread::current());
760 }
761
762 // Preload classes from a list, populate the shared spaces and dump to a
763 // file.
764 void MetaspaceShared::preload_and_dump(TRAPS) {
765 ResourceMark rm(THREAD);
766 HandleMark hm(THREAD);
767
768 if (CDSConfig::is_dumping_final_static_archive() && PrintTrainingInfo) {
769 tty->print_cr("==================== archived_training_data ** before dumping ====================");
770 TrainingData::print_archived_training_data_on(tty);
771 }
772
773 StaticArchiveBuilder builder;
774 preload_and_dump_impl(builder, THREAD);
775 if (HAS_PENDING_EXCEPTION) {
776 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
777 log_error(cds)("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
778 SIZE_FORMAT "M", MaxHeapSize/M);
779 MetaspaceShared::writing_error();
780 } else {
781 log_error(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(),
782 java_lang_String::as_utf8_string(java_lang_Throwable::message(PENDING_EXCEPTION)));
783 MetaspaceShared::writing_error("Unexpected exception, use -Xlog:cds,exceptions=trace for detail");
784 }
785 }
786 }
787
788 #if INCLUDE_CDS_JAVA_HEAP && defined(_LP64)
789 void MetaspaceShared::adjust_heap_sizes_for_dumping() {
790 if (!CDSConfig::is_dumping_heap() || UseCompressedOops) {
791 return;
792 }
793 // CDS heap dumping requires all string oops to have an offset
794 // from the heap bottom that can be encoded in 32-bit.
795 julong max_heap_size = (julong)(4 * G);
796
797 if (MinHeapSize > max_heap_size) {
798 log_debug(cds)("Setting MinHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", MinHeapSize/M);
799 FLAG_SET_ERGO(MinHeapSize, max_heap_size);
800 }
801 if (InitialHeapSize > max_heap_size) {
802 log_debug(cds)("Setting InitialHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", InitialHeapSize/M);
803 FLAG_SET_ERGO(InitialHeapSize, max_heap_size);
804 }
805 if (MaxHeapSize > max_heap_size) {
806 log_debug(cds)("Setting MaxHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", MaxHeapSize/M);
807 FLAG_SET_ERGO(MaxHeapSize, max_heap_size);
808 }
809 }
810 #endif // INCLUDE_CDS_JAVA_HEAP && _LP64
811
812 void MetaspaceShared::get_default_classlist(char* default_classlist, const size_t buf_size) {
813 // Construct the path to the class list (in jre/lib)
814 // Walk up two directories from the location of the VM and
815 // optionally tack on "lib" (depending on platform)
816 os::jvm_path(default_classlist, (jint)(buf_size));
817 for (int i = 0; i < 3; i++) {
818 char *end = strrchr(default_classlist, *os::file_separator());
819 if (end != nullptr) *end = '\0';
820 }
821 size_t classlist_path_len = strlen(default_classlist);
822 if (classlist_path_len >= 3) {
823 if (strcmp(default_classlist + classlist_path_len - 3, "lib") != 0) {
824 if (classlist_path_len < buf_size - 4) {
825 jio_snprintf(default_classlist + classlist_path_len,
826 buf_size - classlist_path_len,
827 "%slib", os::file_separator());
828 classlist_path_len += 4;
829 }
830 }
831 }
832 if (classlist_path_len < buf_size - 10) {
833 jio_snprintf(default_classlist + classlist_path_len,
834 buf_size - classlist_path_len,
835 "%sclasslist", os::file_separator());
836 }
837 }
838
839 void MetaspaceShared::preload_classes(TRAPS) {
840 char default_classlist[JVM_MAXPATHLEN];
841 const char* classlist_path;
842
843 get_default_classlist(default_classlist, sizeof(default_classlist));
844 if (SharedClassListFile == nullptr) {
845 classlist_path = default_classlist;
846 } else {
847 classlist_path = SharedClassListFile;
848 }
849
850 log_info(cds)("Loading classes to share ...");
851 ClassListParser::parse_classlist(classlist_path,
852 ClassListParser::_parse_all, CHECK);
853 if (ExtraSharedClassListFile) {
854 ClassListParser::parse_classlist(ExtraSharedClassListFile,
855 ClassListParser::_parse_all, CHECK);
856 }
857 if (classlist_path != default_classlist) {
858 struct stat statbuf;
859 if (os::stat(default_classlist, &statbuf) == 0) {
860 // File exists, let's use it.
861 ClassListParser::parse_classlist(default_classlist,
862 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
863 }
864 }
865
866 // Exercise the manifest processing code to ensure classes used by CDS at runtime
867 // are always archived
868 const char* dummy = "Manifest-Version: 1.0\n";
869 CDSProtectionDomain::create_jar_manifest(dummy, strlen(dummy), CHECK);
870
871 log_info(cds)("Loading classes to share: done.");
872 }
873
874 void MetaspaceShared::preload_and_dump_impl(StaticArchiveBuilder& builder, TRAPS) {
875 if (CDSConfig::is_dumping_classic_static_archive()) {
876 // We are running with -Xshare:dump
877 preload_classes(CHECK);
878
879 if (SharedArchiveConfigFile) {
880 log_info(cds)("Reading extra data from %s ...", SharedArchiveConfigFile);
881 read_extra_data(THREAD, SharedArchiveConfigFile);
882 log_info(cds)("Reading extra data: done.");
883 }
884 }
885
886 if (CDSConfig::is_dumping_preimage_static_archive()) {
887 log_info(cds)("Reading lambda form invokers of in JDK default classlist ...");
888 char default_classlist[JVM_MAXPATHLEN];
889 get_default_classlist(default_classlist, sizeof(default_classlist));
890 struct stat statbuf;
891 if (os::stat(default_classlist, &statbuf) == 0) {
892 ClassListParser::parse_classlist(default_classlist,
893 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
894 }
895 }
896
897 #if INCLUDE_CDS_JAVA_HEAP
898 if (CDSConfig::is_dumping_invokedynamic()) {
899 // This makes sure that the MethodType and MethodTypeForm tables won't be updated
900 // concurrently when we are saving their contents into a side table.
901 assert(CDSConfig::allow_only_single_java_thread(), "Required");
902
903 JavaValue result(T_VOID);
904 JavaCalls::call_static(&result, vmClasses::MethodType_klass(),
905 vmSymbols::createArchivedObjects(),
906 vmSymbols::void_method_signature(),
907 CHECK);
908 }
909 #endif
910
911 // Rewrite and link classes
912 log_info(cds)("Rewriting and linking classes ...");
913 // Link any classes which got missed. This would happen if we have loaded classes that
914 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
915 // fails verification, all other interfaces that were not specified in the classlist but
916 // are implemented by K are not verified.
917 link_shared_classes(false/*not from jcmd*/, CHECK);
918 log_info(cds)("Rewriting and linking classes: done");
919
920 if (CDSConfig::is_dumping_final_static_archive()) {
921 assert(RecordTraining == false, "must be");
922 RecordTraining = true;
923 }
924
925 TrainingData::init_dumptime_table(CHECK); // captures TrainingDataSetLocker
926
927 _method_handle_intrinsics = new (mtClassShared) GrowableArray<Method*>(256, mtClassShared);
928 SystemDictionary::get_all_method_handle_intrinsics(_method_handle_intrinsics);
929 _method_handle_intrinsics->sort([] (Method** a, Method** b) -> int {
930 Symbol* a_holder = (*a)->method_holder()->name();
931 Symbol* b_holder = (*b)->method_holder()->name();
932 if (a_holder != b_holder) {
933 return a_holder->cmp(b_holder);
934 }
935 Symbol* a_name = (*a)->name();
936 Symbol* b_name = (*b)->name();
937 if (a_name != b_name) {
938 return a_name->cmp(b_name);
939 }
940 Symbol* a_signature = (*a)->signature();
941 Symbol* b_signature = (*b)->signature();
942 if (a_signature != b_signature) {
943 return a_signature->cmp(b_signature);
944 }
945 return 0;
946 });
947
948 #if INCLUDE_CDS_JAVA_HEAP
949 if (CDSConfig::is_dumping_heap()) {
950 if (!HeapShared::is_archived_boot_layer_available(THREAD)) {
951 log_info(cds)("archivedBootLayer not available, disabling full module graph");
952 CDSConfig::stop_dumping_full_module_graph();
953 }
954 HeapShared::init_for_dumping(CHECK);
955 ArchiveHeapWriter::init();
956 if (CDSConfig::is_dumping_full_module_graph()) {
957 HeapShared::reset_archived_object_states(CHECK);
958 }
959
960 if (ArchiveLoaderLookupCache) {
961 SystemDictionaryShared::create_loader_positive_lookup_cache(CHECK);
962 }
963
964 // Do this at the very end, when no Java code will be executed. Otherwise
965 // some new strings may be added to the intern table.
966 StringTable::allocate_shared_strings_array(CHECK);
967 }
968 #endif
969
970 VM_PopulateDumpSharedSpace op(builder);
971 VMThread::execute(&op);
972 FileMapInfo* mapinfo = op.map_info();
973 ArchiveHeapInfo* heap_info = op.heap_info();
974 bool status;
975 if (CDSConfig::is_dumping_preimage_static_archive()) {
976 if ((status = write_static_archive(&builder, mapinfo, heap_info))) {
977 fork_and_dump_final_static_archive();
978 }
979 } else if (CDSConfig::is_dumping_final_static_archive()) {
980 RecordTraining = false;
981 if (StoreCachedCode && CachedCodeFile != nullptr) { // FIXME: new workflow -- remove the CachedCodeFile flag
982 if (log_is_enabled(Info, cds, jit)) {
983 CDSAccess::test_heap_access_api();
984 }
985
986 // We have just created the final image. Let's run the AOT compiler
987 if (PrintTrainingInfo) {
988 tty->print_cr("==================== archived_training_data ** after dumping ====================");
989 TrainingData::print_archived_training_data_on(tty);
990 }
991
992 CDSConfig::enable_dumping_cached_code();
993 {
994 builder.start_cc_region();
995 Precompiler::compile_cached_code(&builder, CHECK);
996 builder.end_cc_region();
997 }
998 CDSConfig::disable_dumping_cached_code();
999
1000 SCCache::close(); // Write final data and close archive
1001 }
1002 status = write_static_archive(&builder, mapinfo, heap_info);
1003 } else {
1004 status = write_static_archive(&builder, mapinfo, heap_info);
1005 }
1006
1007 if (!status) {
1008 THROW_MSG(vmSymbols::java_io_IOException(), "Encountered error while dumping");
1009 }
1010 }
1011
1012 bool MetaspaceShared::write_static_archive(ArchiveBuilder* builder, FileMapInfo* map_info, ArchiveHeapInfo* heap_info) {
1013 // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
1014 // without runtime relocation.
1015 builder->relocate_to_requested();
1016
1017 map_info->open_for_write();
1018 if (!map_info->is_open()) {
1019 return false;
1020 }
1021 builder->write_archive(map_info, heap_info);
1022
1023 if (AllowArchivingWithJavaAgent) {
1024 log_warning(cds)("This archive was created with AllowArchivingWithJavaAgent. It should be used "
1025 "for testing purposes only and should not be used in a production environment");
1026 }
1027 return true;
1028 }
1029
1030 static void print_java_launcher(outputStream* st) {
1031 st->print("%s%sbin%sjava", Arguments::get_java_home(), os::file_separator(), os::file_separator());
1032 }
1033
1034 static void print_vm_arguments(outputStream* st) {
1035 const char* cp = Arguments::get_appclasspath();
1036 if (cp != nullptr && strlen(cp) > 0 && strcmp(cp, ".") != 0) {
1037 st->print(" -cp "); st->print_raw(cp);
1038 }
1039 for (int i = 0; i < Arguments::num_jvm_flags(); i++) {
1040 st->print(" %s", Arguments::jvm_flags_array()[i]);
1041 }
1042 for (int i = 0; i < Arguments::num_jvm_args(); i++) {
1043 st->print(" %s", Arguments::jvm_args_array()[i]);
1044 }
1045 }
1046
1047 void MetaspaceShared::fork_and_dump_final_static_archive() {
1048 assert(CDSConfig::is_dumping_preimage_static_archive(), "sanity");
1049
1050 ResourceMark rm;
1051 stringStream ss;
1052 print_java_launcher(&ss);
1053 print_vm_arguments(&ss);
1054 ss.print(" -XX:CDSPreimage=%s", SharedArchiveFile);
1055
1056 const char* cmd = ss.freeze();
1057 if (CDSManualFinalImage) {
1058 tty->print_cr("-XX:+CDSManualFinalImage is specified");
1059 tty->print_cr("Please manually execute the following command to create the final CDS image:");
1060 tty->print(" "); tty->print_raw_cr(cmd);
1061
1062 // The following is useful if the dumping was trigger by a script that builds
1063 // a complex command-line.
1064 tty->print_cr("Note: to recreate the preimage only:");
1065 tty->print_cr(" rm -f %s", CacheDataStore);
1066 tty->print(" ");
1067 print_java_launcher(tty);
1068 print_vm_arguments(tty);
1069 if (Arguments::java_command() != nullptr) {
1070 tty->print(" %s", Arguments::java_command());
1071 }
1072 tty->cr();
1073 } else {
1074 // FIXME: space characters are not properly quoated. E.g.,
1075 // java -Dfoo='a b c' HelloWorld
1076 log_info(cds)("Launching child process to create final CDS image:");
1077 log_info(cds)(" %s", cmd);
1078 int status = os::fork_and_exec(cmd);
1079 if (status != 0) {
1080 log_error(cds)("Child process finished; status = %d", status);
1081 log_error(cds)("To reproduce the error");
1082 ResourceMark rm;
1083 LogStream ls(Log(cds)::error());
1084 ls.print(" "); ls.print_raw_cr(cmd);
1085
1086 // The following is useful if the dumping was trigger by a script that builds
1087 // a complex command-line.
1088 ls.print_cr("Note: to recreate the preimage only:");
1089 ls.print_cr(" rm -f %s", CacheDataStore);
1090 ls.print(" ");
1091 print_java_launcher(&ls);
1092 print_vm_arguments(&ls);
1093 ls.print(" -XX:+UnlockDiagnosticVMOptions -XX:+CDSManualFinalImage");
1094 if (Arguments::java_command() != nullptr) {
1095 ls.print(" %s", Arguments::java_command());
1096 }
1097 ls.cr();
1098
1099 vm_direct_exit(status);
1100 } else {
1101 log_info(cds)("Child process finished; status = %d", status);
1102 // On Windows, need WRITE permission to remove the file.
1103 WINDOWS_ONLY(chmod(SharedArchiveFile, _S_IREAD | _S_IWRITE));
1104 status = remove(SharedArchiveFile);
1105 if (status != 0) {
1106 log_error(cds)("Failed to remove CDSPreimage file %s", SharedArchiveFile);
1107 } else {
1108 log_info(cds)("Removed CDSPreimage file %s", SharedArchiveFile);
1109 }
1110 }
1111 }
1112 }
1113
1114 // Returns true if the class's status has changed.
1115 bool MetaspaceShared::try_link_class(JavaThread* current, InstanceKlass* ik) {
1116 ExceptionMark em(current);
1117 JavaThread* THREAD = current; // For exception macros.
1118 assert(CDSConfig::is_dumping_archive(), "sanity");
1119
1120 if (ik->is_shared() && !CDSConfig::is_dumping_final_static_archive()) {
1121 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1122 return false;
1123 }
1124
1125 if (ik->is_loaded() && !ik->is_linked() && ik->can_be_verified_at_dumptime() &&
1126 !SystemDictionaryShared::has_class_failed_verification(ik)) {
1127 bool saved = BytecodeVerificationLocal;
1128 if (ik->is_shared_unregistered_class() && ik->class_loader() == nullptr) {
1129 // The verification decision is based on BytecodeVerificationRemote
1130 // for non-system classes. Since we are using the null classloader
1131 // to load non-system classes for customized class loaders during dumping,
1132 // we need to temporarily change BytecodeVerificationLocal to be the same as
1133 // BytecodeVerificationRemote. Note this can cause the parent system
1134 // classes also being verified. The extra overhead is acceptable during
1135 // dumping.
1136 BytecodeVerificationLocal = BytecodeVerificationRemote;
1137 }
1138 ik->link_class(THREAD);
1139 if (HAS_PENDING_EXCEPTION) {
1140 ResourceMark rm(THREAD);
1141 log_warning(cds)("Preload Warning: Verification failed for %s",
1142 ik->external_name());
1143 CLEAR_PENDING_EXCEPTION;
1144 SystemDictionaryShared::set_class_has_failed_verification(ik);
1145 }
1146 ik->compute_has_loops_flag_for_methods();
1147 BytecodeVerificationLocal = saved;
1148 return true;
1149 } else {
1150 return false;
1151 }
1152 }
1153
1154 #if INCLUDE_CDS_JAVA_HEAP
1155 void VM_PopulateDumpSharedSpace::dump_java_heap_objects(GrowableArray<Klass*>* klasses) {
1156 if(!HeapShared::can_write()) {
1157 if (!CDSConfig::is_dumping_preimage_static_archive()) {
1158 log_info(cds)(
1159 "Archived java heap is not supported as UseG1GC "
1160 "and UseCompressedClassPointers are required."
1161 "Current settings: UseG1GC=%s, UseCompressedClassPointers=%s.",
1162 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedClassPointers));
1163 }
1164 return;
1165 }
1166 // Find all the interned strings that should be dumped.
1167 int i;
1168 for (i = 0; i < klasses->length(); i++) {
1169 Klass* k = klasses->at(i);
1170 if (k->is_instance_klass()) {
1171 InstanceKlass* ik = InstanceKlass::cast(k);
1172 if (ik->is_linked()) {
1173 ik->constants()->add_dumped_interned_strings();
1174 }
1175 }
1176 }
1177 if (_extra_interned_strings != nullptr) {
1178 for (i = 0; i < _extra_interned_strings->length(); i ++) {
1179 OopHandle string = _extra_interned_strings->at(i);
1180 HeapShared::add_to_dumped_interned_strings(string.resolve());
1181 }
1182 }
1183
1184 HeapShared::archive_objects(&_heap_info);
1185 ArchiveBuilder::OtherROAllocMark mark;
1186 HeapShared::write_subgraph_info_table();
1187 }
1188 #endif // INCLUDE_CDS_JAVA_HEAP
1189
1190 void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
1191 assert(base <= static_top && static_top <= top, "must be");
1192 _shared_metaspace_static_top = static_top;
1193 MetaspaceObj::set_shared_metaspace_range(base, top);
1194 }
1195
1196 bool MetaspaceShared::is_shared_dynamic(void* p) {
1197 if ((p < MetaspaceObj::shared_metaspace_top()) &&
1198 (p >= _shared_metaspace_static_top)) {
1199 return true;
1200 } else {
1201 return false;
1202 }
1203 }
1204
1205 bool MetaspaceShared::is_shared_static(void* p) {
1206 if (is_in_shared_metaspace(p) && !is_shared_dynamic(p)) {
1207 return true;
1208 } else {
1209 return false;
1210 }
1211 }
1212
1213 // This function is called when the JVM is unable to load the specified archive(s) due to one
1214 // of the following conditions.
1215 // - There's an error that indicates that the archive(s) files were corrupt or otherwise damaged.
1216 // - When -XX:+RequireSharedSpaces is specified, AND the JVM cannot load the archive(s) due
1217 // to version or classpath mismatch.
1218 void MetaspaceShared::unrecoverable_loading_error(const char* message) {
1219 log_error(cds)("An error has occurred while processing the shared archive file.");
1220 if (message != nullptr) {
1221 log_error(cds)("%s", message);
1222 }
1223 vm_exit_during_initialization("Unable to use shared archive.", nullptr);
1224 }
1225
1226 // This function is called when the JVM is unable to write the specified CDS archive due to an
1227 // unrecoverable error.
1228 void MetaspaceShared::unrecoverable_writing_error(const char* message) {
1229 writing_error(message);
1230 vm_direct_exit(1);
1231 }
1232
1233 // This function is called when the JVM is unable to write the specified CDS archive due to a
1234 // an error. The error will be propagated
1235 void MetaspaceShared::writing_error(const char* message) {
1236 log_error(cds)("An error has occurred while writing the shared archive file.");
1237 if (message != nullptr) {
1238 log_error(cds)("%s", message);
1239 }
1240 }
1241
1242 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
1243 assert(CDSConfig::is_using_archive(), "Must be called when UseSharedSpaces is enabled");
1244 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1245
1246 FileMapInfo* static_mapinfo = FileMapInfo::current_info();
1247 FileMapInfo* dynamic_mapinfo = nullptr;
1248
1249 if (static_mapinfo != nullptr) {
1250 log_info(cds)("Core region alignment: " SIZE_FORMAT, static_mapinfo->core_region_alignment());
1251 dynamic_mapinfo = open_dynamic_archive();
1252
1253 // First try to map at the requested address
1254 result = map_archives(static_mapinfo, dynamic_mapinfo, true);
1255 if (result == MAP_ARCHIVE_MMAP_FAILURE) {
1256 // Mapping has failed (probably due to ASLR). Let's map at an address chosen
1257 // by the OS.
1258 log_info(cds)("Try to map archive(s) at an alternative address");
1259 result = map_archives(static_mapinfo, dynamic_mapinfo, false);
1260 }
1261 }
1262
1263 if (result == MAP_ARCHIVE_SUCCESS) {
1264 bool dynamic_mapped = (dynamic_mapinfo != nullptr && dynamic_mapinfo->is_mapped());
1265 char* cds_base = static_mapinfo->mapped_base();
1266 char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
1267 // Register CDS memory region with LSan.
1268 LSAN_REGISTER_ROOT_REGION(cds_base, cds_end - cds_base);
1269 set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
1270 _relocation_delta = static_mapinfo->relocation_delta();
1271 _requested_base_address = static_mapinfo->requested_base_address();
1272 if (dynamic_mapped) {
1273 FileMapInfo::set_shared_path_table(dynamic_mapinfo);
1274 // turn AutoCreateSharedArchive off if successfully mapped
1275 AutoCreateSharedArchive = false;
1276 } else {
1277 FileMapInfo::set_shared_path_table(static_mapinfo);
1278 }
1279 } else {
1280 set_shared_metaspace_range(nullptr, nullptr, nullptr);
1281 if (CDSConfig::is_dumping_dynamic_archive()) {
1282 log_warning(cds)("-XX:ArchiveClassesAtExit is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
1283 }
1284 UseSharedSpaces = false;
1285 // The base archive cannot be mapped. We cannot dump the dynamic shared archive.
1286 AutoCreateSharedArchive = false;
1287 CDSConfig::disable_dumping_dynamic_archive();
1288 log_info(cds)("Unable to map shared spaces");
1289 if (PrintSharedArchiveAndExit) {
1290 MetaspaceShared::unrecoverable_loading_error("Unable to use shared archive.");
1291 } else if (RequireSharedSpaces) {
1292 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1293 } else if (CDSConfig::is_dumping_final_static_archive()) {
1294 assert(CDSPreimage != nullptr, "must be");
1295 log_error(cds)("Unable to map shared spaces for CDSPreimage = %s", CDSPreimage);
1296 MetaspaceShared::unrecoverable_loading_error();
1297 }
1298 }
1299
1300 // If mapping failed and -XShare:on, the vm should exit
1301 bool has_failed = false;
1302 if (static_mapinfo != nullptr && !static_mapinfo->is_mapped()) {
1303 has_failed = true;
1304 delete static_mapinfo;
1305 }
1306 if (dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped()) {
1307 has_failed = true;
1308 delete dynamic_mapinfo;
1309 }
1310 if (RequireSharedSpaces && has_failed) {
1311 // static archive mapped but dynamic archive failed
1312 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1313 }
1314 }
1315
1316 // This is called very early at VM start up to get the size of the cached_code region, which
1317 // is used in CodeCache::initialize_heaps()
1318 void MetaspaceShared::open_static_archive() {
1319 if (!UseSharedSpaces) {
1320 return;
1321 }
1322 const char* static_archive = CDSConfig::static_archive_path();
1323 assert(static_archive != nullptr, "sanity");
1324 FileMapInfo* mapinfo = new FileMapInfo(static_archive, true);
1325 if (!mapinfo->initialize()) {
1326 delete(mapinfo);
1327 } else {
1328 FileMapRegion* r = mapinfo->region_at(MetaspaceShared::cc);
1329 CDSAccess::set_cached_code_size(r->used());
1330 }
1331 }
1332
1333 FileMapInfo* MetaspaceShared::open_dynamic_archive() {
1334 if (CDSConfig::is_dumping_dynamic_archive()) {
1335 return nullptr;
1336 }
1337 const char* dynamic_archive = CDSConfig::dynamic_archive_path();
1338 if (dynamic_archive == nullptr) {
1339 return nullptr;
1340 }
1341
1342 FileMapInfo* mapinfo = new FileMapInfo(dynamic_archive, false);
1343 if (!mapinfo->initialize()) {
1344 delete(mapinfo);
1345 if (RequireSharedSpaces) {
1346 MetaspaceShared::unrecoverable_loading_error("Failed to initialize dynamic archive");
1347 }
1348 return nullptr;
1349 }
1350 return mapinfo;
1351 }
1352
1353 // use_requested_addr:
1354 // true = map at FileMapHeader::_requested_base_address
1355 // false = map at an alternative address picked by OS.
1356 MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
1357 bool use_requested_addr) {
1358 if (use_requested_addr && static_mapinfo->requested_base_address() == nullptr) {
1359 log_info(cds)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
1360 return MAP_ARCHIVE_MMAP_FAILURE;
1361 }
1362
1363 PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1364 // For product build only -- this is for benchmarking the cost of doing relocation.
1365 // For debug builds, the check is done below, after reserving the space, for better test coverage
1366 // (see comment below).
1367 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1368 return MAP_ARCHIVE_MMAP_FAILURE;
1369 });
1370
1371 if (ArchiveRelocationMode == 2 && !use_requested_addr) {
1372 log_info(cds)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
1373 return MAP_ARCHIVE_MMAP_FAILURE;
1374 };
1375
1376 if (dynamic_mapinfo != nullptr) {
1377 // Ensure that the OS won't be able to allocate new memory spaces between the two
1378 // archives, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1379 assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
1380 }
1381
1382 ReservedSpace total_space_rs, archive_space_rs, class_space_rs;
1383 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1384 char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo,
1385 dynamic_mapinfo,
1386 use_requested_addr,
1387 total_space_rs,
1388 archive_space_rs,
1389 class_space_rs);
1390 if (mapped_base_address == nullptr) {
1391 result = MAP_ARCHIVE_MMAP_FAILURE;
1392 log_debug(cds)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
1393 } else {
1394
1395 #ifdef ASSERT
1396 // Some sanity checks after reserving address spaces for archives
1397 // and class space.
1398 assert(archive_space_rs.is_reserved(), "Sanity");
1399 if (Metaspace::using_class_space()) {
1400 // Class space must closely follow the archive space. Both spaces
1401 // must be aligned correctly.
1402 assert(class_space_rs.is_reserved(),
1403 "A class space should have been reserved");
1404 assert(class_space_rs.base() >= archive_space_rs.end(),
1405 "class space should follow the cds archive space");
1406 assert(is_aligned(archive_space_rs.base(),
1407 core_region_alignment()),
1408 "Archive space misaligned");
1409 assert(is_aligned(class_space_rs.base(),
1410 Metaspace::reserve_alignment()),
1411 "class space misaligned");
1412 }
1413 #endif // ASSERT
1414
1415 log_info(cds)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
1416 p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size());
1417 log_info(cds)("Reserved class_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
1418 p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
1419
1420 if (MetaspaceShared::use_windows_memory_mapping()) {
1421 // We have now reserved address space for the archives, and will map in
1422 // the archive files into this space.
1423 //
1424 // Special handling for Windows: on Windows we cannot map a file view
1425 // into an existing memory mapping. So, we unmap the address range we
1426 // just reserved again, which will make it available for mapping the
1427 // archives.
1428 // Reserving this range has not been for naught however since it makes
1429 // us reasonably sure the address range is available.
1430 //
1431 // But still it may fail, since between unmapping the range and mapping
1432 // in the archive someone else may grab the address space. Therefore
1433 // there is a fallback in FileMap::map_region() where we just read in
1434 // the archive files sequentially instead of mapping it in. We couple
1435 // this with use_requested_addr, since we're going to patch all the
1436 // pointers anyway so there's no benefit to mmap.
1437 if (use_requested_addr) {
1438 assert(!total_space_rs.is_reserved(), "Should not be reserved for Windows");
1439 log_info(cds)("Windows mmap workaround: releasing archive space.");
1440 archive_space_rs.release();
1441 }
1442 }
1443 MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
1444 MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
1445 map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
1446
1447 DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1448 // This is for simulating mmap failures at the requested address. In
1449 // debug builds, we do it here (after all archives have possibly been
1450 // mapped), so we can thoroughly test the code for failure handling
1451 // (releasing all allocated resource, etc).
1452 log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1453 if (static_result == MAP_ARCHIVE_SUCCESS) {
1454 static_result = MAP_ARCHIVE_MMAP_FAILURE;
1455 }
1456 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1457 dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
1458 }
1459 });
1460
1461 if (static_result == MAP_ARCHIVE_SUCCESS) {
1462 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1463 result = MAP_ARCHIVE_SUCCESS;
1464 } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
1465 assert(dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped(), "must have failed");
1466 // No need to retry mapping the dynamic archive again, as it will never succeed
1467 // (bad file, etc) -- just keep the base archive.
1468 log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
1469 dynamic_mapinfo->full_path());
1470 result = MAP_ARCHIVE_SUCCESS;
1471 // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
1472 // easy API to do that right now.
1473 } else {
1474 result = MAP_ARCHIVE_MMAP_FAILURE;
1475 }
1476 } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
1477 result = MAP_ARCHIVE_OTHER_FAILURE;
1478 } else {
1479 result = MAP_ARCHIVE_MMAP_FAILURE;
1480 }
1481 }
1482
1483 if (result == MAP_ARCHIVE_SUCCESS) {
1484 SharedBaseAddress = (size_t)mapped_base_address;
1485 #ifdef _LP64
1486 if (Metaspace::using_class_space()) {
1487 // Set up ccs in metaspace.
1488 Metaspace::initialize_class_space(class_space_rs);
1489
1490 // Set up compressed Klass pointer encoding: the encoding range must
1491 // cover both archive and class space.
1492 address cds_base = (address)static_mapinfo->mapped_base();
1493 address ccs_end = (address)class_space_rs.end();
1494 assert(ccs_end > cds_base, "Sanity check");
1495 #if INCLUDE_CDS_JAVA_HEAP
1496 // We archived objects with pre-computed narrow Klass id. Set up encoding such that these Ids stay valid.
1497 address precomputed_narrow_klass_base = cds_base;
1498 const int precomputed_narrow_klass_shift = ArchiveHeapWriter::precomputed_narrow_klass_shift;
1499 CompressedKlassPointers::initialize_for_given_encoding(
1500 cds_base, ccs_end - cds_base, // Klass range
1501 precomputed_narrow_klass_base, precomputed_narrow_klass_shift // precomputed encoding, see ArchiveHeapWriter
1502 );
1503 #else
1504 CompressedKlassPointers::initialize (
1505 cds_base, ccs_end - cds_base // Klass range
1506 );
1507 #endif // INCLUDE_CDS_JAVA_HEAP
1508 // map_or_load_heap_region() compares the current narrow oop and klass encodings
1509 // with the archived ones, so it must be done after all encodings are determined.
1510 static_mapinfo->map_or_load_heap_region();
1511 }
1512 #endif // _LP64
1513 log_info(cds)("initial optimized module handling: %s", CDSConfig::is_using_optimized_module_handling() ? "enabled" : "disabled");
1514 log_info(cds)("initial full module graph: %s", CDSConfig::is_using_full_module_graph() ? "enabled" : "disabled");
1515 } else {
1516 unmap_archive(static_mapinfo);
1517 unmap_archive(dynamic_mapinfo);
1518 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1519 }
1520
1521 return result;
1522 }
1523
1524
1525 // This will reserve two address spaces suitable to house Klass structures, one
1526 // for the cds archives (static archive and optionally dynamic archive) and
1527 // optionally one move for ccs.
1528 //
1529 // Since both spaces must fall within the compressed class pointer encoding
1530 // range, they are allocated close to each other.
1531 //
1532 // Space for archives will be reserved first, followed by a potential gap,
1533 // followed by the space for ccs:
1534 //
1535 // +-- Base address A B End
1536 // | | | |
1537 // v v v v
1538 // +-------------+--------------+ +----------------------+
1539 // | static arc | [dyn. arch] | [gap] | compr. class space |
1540 // +-------------+--------------+ +----------------------+
1541 //
1542 // (The gap may result from different alignment requirements between metaspace
1543 // and CDS)
1544 //
1545 // If UseCompressedClassPointers is disabled, only one address space will be
1546 // reserved:
1547 //
1548 // +-- Base address End
1549 // | |
1550 // v v
1551 // +-------------+--------------+
1552 // | static arc | [dyn. arch] |
1553 // +-------------+--------------+
1554 //
1555 // Base address: If use_archive_base_addr address is true, the Base address is
1556 // determined by the address stored in the static archive. If
1557 // use_archive_base_addr address is false, this base address is determined
1558 // by the platform.
1559 //
1560 // If UseCompressedClassPointers=1, the range encompassing both spaces will be
1561 // suitable to en/decode narrow Klass pointers: the base will be valid for
1562 // encoding, the range [Base, End) not surpass KlassEncodingMetaspaceMax.
1563 //
1564 // Return:
1565 //
1566 // - On success:
1567 // - total_space_rs will be reserved as whole for archive_space_rs and
1568 // class_space_rs if UseCompressedClassPointers is true.
1569 // On Windows, try reserve archive_space_rs and class_space_rs
1570 // separately first if use_archive_base_addr is true.
1571 // - archive_space_rs will be reserved and large enough to host static and
1572 // if needed dynamic archive: [Base, A).
1573 // archive_space_rs.base and size will be aligned to CDS reserve
1574 // granularity.
1575 // - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
1576 // be reserved. Its start address will be aligned to metaspace reserve
1577 // alignment, which may differ from CDS alignment. It will follow the cds
1578 // archive space, close enough such that narrow class pointer encoding
1579 // covers both spaces.
1580 // If UseCompressedClassPointers=0, class_space_rs remains unreserved.
1581 // - On error: null is returned and the spaces remain unreserved.
1582 char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
1583 FileMapInfo* dynamic_mapinfo,
1584 bool use_archive_base_addr,
1585 ReservedSpace& total_space_rs,
1586 ReservedSpace& archive_space_rs,
1587 ReservedSpace& class_space_rs) {
1588
1589 address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : nullptr);
1590 const size_t archive_space_alignment = core_region_alignment();
1591
1592 // Size and requested location of the archive_space_rs (for both static and dynamic archives)
1593 assert(static_mapinfo->mapping_base_offset() == 0, "Must be");
1594 size_t archive_end_offset = (dynamic_mapinfo == nullptr) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
1595 size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
1596
1597 if (!Metaspace::using_class_space()) {
1598 // Get the simple case out of the way first:
1599 // no compressed class space, simple allocation.
1600
1601 // When running without class space, requested archive base should be aligned to cds core alignment.
1602 assert(is_aligned(base_address, archive_space_alignment),
1603 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1604 p2i(base_address), archive_space_alignment);
1605
1606 archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
1607 os::vm_page_size(), (char*)base_address);
1608 if (archive_space_rs.is_reserved()) {
1609 assert(base_address == nullptr ||
1610 (address)archive_space_rs.base() == base_address, "Sanity");
1611 // Register archive space with NMT.
1612 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
1613 return archive_space_rs.base();
1614 }
1615 return nullptr;
1616 }
1617
1618 #ifdef _LP64
1619
1620 // Complex case: two spaces adjacent to each other, both to be addressable
1621 // with narrow class pointers.
1622 // We reserve the whole range spanning both spaces, then split that range up.
1623
1624 const size_t class_space_alignment = Metaspace::reserve_alignment();
1625
1626 // When running with class space, requested archive base must satisfy both cds core alignment
1627 // and class space alignment.
1628 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1629 assert(is_aligned(base_address, base_address_alignment),
1630 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1631 p2i(base_address), base_address_alignment);
1632
1633 size_t class_space_size = CompressedClassSpaceSize;
1634 assert(CompressedClassSpaceSize > 0 &&
1635 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1636 "CompressedClassSpaceSize malformed: "
1637 SIZE_FORMAT, CompressedClassSpaceSize);
1638
1639 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1640 const size_t gap_size = ccs_begin_offset - archive_space_size;
1641
1642 // Reduce class space size if it would not fit into the Klass encoding range
1643 constexpr size_t max_encoding_range_size = 4 * G;
1644 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1645 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1646 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1647 log_info(metaspace)("CDS initialization: reducing class space size from " SIZE_FORMAT " to " SIZE_FORMAT,
1648 CompressedClassSpaceSize, class_space_size);
1649 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1650 }
1651
1652 const size_t total_range_size =
1653 archive_space_size + gap_size + class_space_size;
1654
1655 assert(total_range_size > ccs_begin_offset, "must be");
1656 if (use_windows_memory_mapping() && use_archive_base_addr) {
1657 if (base_address != nullptr) {
1658 // On Windows, we cannot safely split a reserved memory space into two (see JDK-8255917).
1659 // Hence, we optimistically reserve archive space and class space side-by-side. We only
1660 // do this for use_archive_base_addr=true since for use_archive_base_addr=false case
1661 // caller will not split the combined space for mapping, instead read the archive data
1662 // via sequential file IO.
1663 address ccs_base = base_address + archive_space_size + gap_size;
1664 archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
1665 os::vm_page_size(), (char*)base_address);
1666 class_space_rs = ReservedSpace(class_space_size, class_space_alignment,
1667 os::vm_page_size(), (char*)ccs_base);
1668 }
1669 if (!archive_space_rs.is_reserved() || !class_space_rs.is_reserved()) {
1670 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1671 return nullptr;
1672 }
1673 // NMT: fix up the space tags
1674 MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
1675 MemTracker::record_virtual_memory_type(class_space_rs.base(), mtClass);
1676 } else {
1677 if (use_archive_base_addr && base_address != nullptr) {
1678 total_space_rs = ReservedSpace(total_range_size, base_address_alignment,
1679 os::vm_page_size(), (char*) base_address);
1680 } else {
1681 // We did not manage to reserve at the preferred address, or were instructed to relocate. In that
1682 // case we reserve wherever possible, but the start address needs to be encodable as narrow Klass
1683 // encoding base since the archived heap objects contain nKlass IDs pre-calculated toward the start
1684 // of the shared Metaspace. That prevents us from using zero-based encoding and therefore we won't
1685 // try allocating in low-address regions.
1686 total_space_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size, false /* optimize_for_zero_base */);
1687 }
1688
1689 if (!total_space_rs.is_reserved()) {
1690 return nullptr;
1691 }
1692
1693 // Paranoid checks:
1694 assert(base_address == nullptr || (address)total_space_rs.base() == base_address,
1695 "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_space_rs.base()));
1696 assert(is_aligned(total_space_rs.base(), base_address_alignment), "Sanity");
1697 assert(total_space_rs.size() == total_range_size, "Sanity");
1698
1699 // Now split up the space into ccs and cds archive. For simplicity, just leave
1700 // the gap reserved at the end of the archive space. Do not do real splitting.
1701 archive_space_rs = total_space_rs.first_part(ccs_begin_offset,
1702 (size_t)archive_space_alignment);
1703 class_space_rs = total_space_rs.last_part(ccs_begin_offset);
1704 MemTracker::record_virtual_memory_split_reserved(total_space_rs.base(), total_space_rs.size(),
1705 ccs_begin_offset, mtClassShared, mtClass);
1706 }
1707 assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
1708 assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
1709 assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
1710 assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
1711
1712
1713 return archive_space_rs.base();
1714
1715 #else
1716 ShouldNotReachHere();
1717 return nullptr;
1718 #endif
1719
1720 }
1721
1722 void MetaspaceShared::release_reserved_spaces(ReservedSpace& total_space_rs,
1723 ReservedSpace& archive_space_rs,
1724 ReservedSpace& class_space_rs) {
1725 if (total_space_rs.is_reserved()) {
1726 log_debug(cds)("Released shared space (archive + class) " INTPTR_FORMAT, p2i(total_space_rs.base()));
1727 total_space_rs.release();
1728 } else {
1729 if (archive_space_rs.is_reserved()) {
1730 log_debug(cds)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
1731 archive_space_rs.release();
1732 }
1733 if (class_space_rs.is_reserved()) {
1734 log_debug(cds)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
1735 class_space_rs.release();
1736 }
1737 }
1738 }
1739
1740 static int archive_regions[] = { MetaspaceShared::rw, MetaspaceShared::ro };
1741 static int archive_regions_count = 2;
1742
1743 MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
1744 assert(CDSConfig::is_using_archive(), "must be runtime");
1745 if (mapinfo == nullptr) {
1746 return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
1747 }
1748
1749 if (!mapinfo->validate_aot_class_linking()) {
1750 return MAP_ARCHIVE_OTHER_FAILURE;
1751 }
1752
1753 mapinfo->set_is_mapped(false);
1754 if (mapinfo->core_region_alignment() != (size_t)core_region_alignment()) {
1755 log_info(cds)("Unable to map CDS archive -- core_region_alignment() expected: " SIZE_FORMAT
1756 " actual: " SIZE_FORMAT, mapinfo->core_region_alignment(), core_region_alignment());
1757 return MAP_ARCHIVE_OTHER_FAILURE;
1758 }
1759
1760 MapArchiveResult result =
1761 mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
1762
1763 if (result != MAP_ARCHIVE_SUCCESS) {
1764 unmap_archive(mapinfo);
1765 return result;
1766 }
1767
1768 if (!mapinfo->validate_shared_path_table()) {
1769 unmap_archive(mapinfo);
1770 return MAP_ARCHIVE_OTHER_FAILURE;
1771 }
1772
1773 mapinfo->set_is_mapped(true);
1774 return MAP_ARCHIVE_SUCCESS;
1775 }
1776
1777 void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
1778 assert(CDSConfig::is_using_archive(), "must be runtime");
1779 if (mapinfo != nullptr) {
1780 mapinfo->unmap_regions(archive_regions, archive_regions_count);
1781 mapinfo->unmap_region(MetaspaceShared::bm);
1782 mapinfo->set_is_mapped(false);
1783 }
1784 }
1785
1786 // For -XX:PrintSharedArchiveAndExit
1787 class CountSharedSymbols : public SymbolClosure {
1788 private:
1789 int _count;
1790 public:
1791 CountSharedSymbols() : _count(0) {}
1792 void do_symbol(Symbol** sym) {
1793 _count++;
1794 }
1795 int total() { return _count; }
1796
1797 };
1798
1799 // Read the miscellaneous data from the shared file, and
1800 // serialize it out to its various destinations.
1801
1802 void MetaspaceShared::initialize_shared_spaces() {
1803 FileMapInfo *static_mapinfo = FileMapInfo::current_info();
1804
1805 // Verify various attributes of the archive, plus initialize the
1806 // shared string/symbol tables.
1807 char* buffer = static_mapinfo->serialized_data();
1808 intptr_t* array = (intptr_t*)buffer;
1809 ReadClosure rc(&array);
1810 serialize(&rc);
1811
1812 // Finish up archived heap initialization. These must be
1813 // done after ReadClosure.
1814 static_mapinfo->patch_heap_embedded_pointers();
1815 ArchiveHeapLoader::finish_initialization();
1816 Universe::load_archived_object_instances();
1817 SCCache::new_workflow_load_cache();
1818
1819 // Close the mapinfo file
1820 static_mapinfo->close();
1821
1822 static_mapinfo->unmap_region(MetaspaceShared::bm);
1823
1824 FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
1825 if (dynamic_mapinfo != nullptr) {
1826 intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
1827 ReadClosure rc(&buffer);
1828 ArchiveBuilder::serialize_dynamic_archivable_items(&rc);
1829 DynamicArchive::setup_array_klasses();
1830 dynamic_mapinfo->close();
1831 dynamic_mapinfo->unmap_region(MetaspaceShared::bm);
1832 }
1833
1834 log_info(cds)("Using AOT-linked classes: %s (%s%s)",
1835 CDSConfig::is_using_aot_linked_classes() ? "true" : "false",
1836 static_mapinfo->header()->has_aot_linked_classes() ? "static archive: true" : "static archive: false",
1837 (dynamic_mapinfo == nullptr) ? "" :
1838 (dynamic_mapinfo->header()->has_aot_linked_classes() ? ", dynamic archive: true" : ", dynamic archive: false"));
1839
1840 // Set up LambdaFormInvokers::_lambdaform_lines for dynamic dump
1841 if (CDSConfig::is_dumping_dynamic_archive()) {
1842 // Read stored LF format lines stored in static archive
1843 LambdaFormInvokers::read_static_archive_invokers();
1844 }
1845
1846 if (PrintSharedArchiveAndExit) {
1847 // Print archive names
1848 if (dynamic_mapinfo != nullptr) {
1849 tty->print_cr("\n\nBase archive name: %s", CDSConfig::static_archive_path());
1850 tty->print_cr("Base archive version %d", static_mapinfo->version());
1851 } else {
1852 tty->print_cr("Static archive name: %s", static_mapinfo->full_path());
1853 tty->print_cr("Static archive version %d", static_mapinfo->version());
1854 }
1855
1856 SystemDictionaryShared::print_shared_archive(tty);
1857 if (dynamic_mapinfo != nullptr) {
1858 tty->print_cr("\n\nDynamic archive name: %s", dynamic_mapinfo->full_path());
1859 tty->print_cr("Dynamic archive version %d", dynamic_mapinfo->version());
1860 SystemDictionaryShared::print_shared_archive(tty, false/*dynamic*/);
1861 }
1862 TrainingData::print_archived_training_data_on(tty);
1863
1864 if (LoadCachedCode) {
1865 tty->print_cr("\n\nCached Code file: %s", CachedCodeFile);
1866 SCCache::print_on(tty);
1867 }
1868
1869 // collect shared symbols and strings
1870 CountSharedSymbols cl;
1871 SymbolTable::shared_symbols_do(&cl);
1872 tty->print_cr("Number of shared symbols: %d", cl.total());
1873 tty->print_cr("Number of shared strings: %zu", StringTable::shared_entry_count());
1874 tty->print_cr("VM version: %s\r\n", static_mapinfo->vm_version());
1875 if (FileMapInfo::current_info() == nullptr || _archive_loading_failed) {
1876 tty->print_cr("archive is invalid");
1877 vm_exit(1);
1878 } else {
1879 tty->print_cr("archive is valid");
1880 vm_exit(0);
1881 }
1882 }
1883 }
1884
1885 // JVM/TI RedefineClasses() support:
1886 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1887 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1888
1889 if (CDSConfig::is_using_archive()) {
1890 // remap the shared readonly space to shared readwrite, private
1891 FileMapInfo* mapinfo = FileMapInfo::current_info();
1892 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1893 return false;
1894 }
1895 if (FileMapInfo::dynamic_info() != nullptr) {
1896 mapinfo = FileMapInfo::dynamic_info();
1897 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1898 return false;
1899 }
1900 }
1901 _remapped_readwrite = true;
1902 }
1903 return true;
1904 }
1905
1906 void MetaspaceShared::print_on(outputStream* st) {
1907 if (CDSConfig::is_using_archive()) {
1908 st->print("CDS archive(s) mapped at: ");
1909 address base = (address)MetaspaceObj::shared_metaspace_base();
1910 address static_top = (address)_shared_metaspace_static_top;
1911 address top = (address)MetaspaceObj::shared_metaspace_top();
1912 st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
1913 st->print("size " SIZE_FORMAT ", ", top - base);
1914 st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, ArchiveRelocationMode);
1915 } else {
1916 st->print("CDS archive(s) not mapped");
1917 }
1918 st->cr();
1919 }