1 /*
2 * Copyright (c) 2012, 2025, 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 "cds/aotCacheAccess.hpp"
26 #include "cds/aotClassInitializer.hpp"
27 #include "cds/aotArtifactFinder.hpp"
28 #include "cds/aotClassInitializer.hpp"
29 #include "cds/aotClassLinker.hpp"
30 #include "cds/aotClassLocation.hpp"
31 #include "cds/aotConstantPoolResolver.hpp"
32 #include "cds/aotLinkedClassBulkLoader.hpp"
33 #include "cds/aotLogging.hpp"
34 #include "cds/aotReferenceObjSupport.hpp"
35 #include "cds/archiveBuilder.hpp"
36 #include "cds/archiveHeapLoader.hpp"
37 #include "cds/archiveHeapWriter.hpp"
38 #include "cds/cds_globals.hpp"
39 #include "cds/cdsConfig.hpp"
40 #include "cds/cdsProtectionDomain.hpp"
41 #include "cds/classListParser.hpp"
42 #include "cds/classListWriter.hpp"
43 #include "cds/cppVtables.hpp"
44 #include "cds/dumpAllocStats.hpp"
45 #include "cds/dynamicArchive.hpp"
46 #include "cds/filemap.hpp"
47 #include "cds/finalImageRecipes.hpp"
48 #include "cds/heapShared.hpp"
49 #include "cds/lambdaFormInvokers.hpp"
50 #include "cds/lambdaProxyClassDictionary.hpp"
51 #include "cds/metaspaceShared.hpp"
52 #include "classfile/classLoaderDataGraph.hpp"
53 #include "classfile/classLoaderDataShared.hpp"
54 #include "classfile/classLoaderExt.hpp"
55 #include "classfile/javaClasses.inline.hpp"
56 #include "classfile/loaderConstraints.hpp"
57 #include "classfile/modules.hpp"
58 #include "classfile/placeholders.hpp"
59 #include "classfile/stringTable.hpp"
60 #include "classfile/symbolTable.hpp"
61 #include "classfile/systemDictionary.hpp"
62 #include "classfile/systemDictionaryShared.hpp"
63 #include "classfile/vmClasses.hpp"
64 #include "classfile/vmSymbols.hpp"
65 #include "code/aotCodeCache.hpp"
66 #include "code/codeCache.hpp"
67 #include "compiler/compileBroker.hpp"
68 #include "compiler/precompiler.hpp"
69 #include "gc/shared/gcVMOperations.hpp"
70 #include "interpreter/bytecodeStream.hpp"
71 #include "interpreter/bytecodes.hpp"
72 #include "jvm_io.h"
73 #include "logging/log.hpp"
74 #include "logging/logMessage.hpp"
75 #include "logging/logStream.hpp"
76 #include "memory/memoryReserver.hpp"
77 #include "memory/metaspace.hpp"
78 #include "memory/metaspaceClosure.hpp"
79 #include "memory/oopFactory.hpp"
80 #include "memory/resourceArea.hpp"
81 #include "memory/universe.hpp"
82 #include "nmt/memTracker.hpp"
83 #include "oops/compressedKlass.hpp"
84 #include "oops/instanceMirrorKlass.hpp"
85 #include "oops/klass.inline.hpp"
86 #include "oops/method.inline.hpp"
87 #include "oops/objArrayOop.hpp"
88 #include "oops/oop.inline.hpp"
89 #include "oops/oopHandle.hpp"
90 #include "oops/trainingData.hpp"
91 #include "prims/jvmtiExport.hpp"
92 #include "prims/whitebox.hpp"
93 #include "runtime/arguments.hpp"
94 #include "runtime/globals.hpp"
95 #include "runtime/globals_extension.hpp"
96 #include "runtime/handles.inline.hpp"
97 #include "runtime/javaCalls.hpp"
98 #include "runtime/os.inline.hpp"
99 #include "runtime/safepointVerifiers.hpp"
100 #include "runtime/sharedRuntime.hpp"
101 #include "runtime/vmOperations.hpp"
102 #include "runtime/vmThread.hpp"
103 #include "sanitizers/leak.hpp"
104 #include "services/management.hpp"
105 #include "utilities/align.hpp"
106 #include "utilities/bitMap.inline.hpp"
107 #include "utilities/defaultStream.hpp"
108 #include "utilities/macros.hpp"
109 #include "utilities/ostream.hpp"
110 #include "utilities/resourceHash.hpp"
111
112 #include <sys/stat.h>
113
114 ReservedSpace MetaspaceShared::_symbol_rs;
115 VirtualSpace MetaspaceShared::_symbol_vs;
116 bool MetaspaceShared::_archive_loading_failed = false;
117 bool MetaspaceShared::_remapped_readwrite = false;
118 void* MetaspaceShared::_shared_metaspace_static_top = nullptr;
119 intx MetaspaceShared::_relocation_delta;
120 char* MetaspaceShared::_requested_base_address;
121 Array<Method*>* MetaspaceShared::_archived_method_handle_intrinsics = nullptr;
122 bool MetaspaceShared::_use_optimized_module_handling = true;
123 int volatile MetaspaceShared::_preimage_static_archive_dumped = 0;
124 jlong MetaspaceShared::_preimage_static_archive_recording_duration = 0;
125
126 // The CDS archive is divided into the following regions:
127 // rw - read-write metadata
128 // ro - read-only metadata and read-only tables
129 // hp - heap region
130 // bm - bitmap for relocating the above 7 regions.
131 //
132 // The rw and ro regions are linearly allocated, in the order of rw->ro.
133 // These regions are aligned with MetaspaceShared::core_region_alignment().
134 //
135 // These 2 regions are populated in the following steps:
136 // [0] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
137 // temporarily allocated outside of the shared regions.
138 // [1] We enter a safepoint and allocate a buffer for the rw/ro regions.
139 // [2] C++ vtables are copied into the rw region.
140 // [3] ArchiveBuilder copies RW metadata into the rw region.
141 // [4] ArchiveBuilder copies RO metadata into the ro region.
142 // [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
143 // are copied into the ro region as read-only tables.
144 //
145 // The heap region is written by HeapShared::write_heap().
146 //
147 // The bitmap region is used to relocate the ro/rw/hp regions.
148
149 static DumpRegion _symbol_region("symbols");
150
151 char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
152 return _symbol_region.allocate(num_bytes);
153 }
154
155 // os::vm_allocation_granularity() is usually 4K for most OSes. However, some platforms
156 // such as linux-aarch64 and macos-x64 ...
157 // it can be either 4K or 64K and on macos-aarch64 it is 16K. To generate archives that are
158 // compatible for both settings, an alternative cds core region alignment can be enabled
159 // at building time:
160 // --enable-compactible-cds-alignment
161 // Upon successful configuration, the compactible alignment then can be defined in:
162 // os_linux_aarch64.cpp
163 // os_bsd_x86.cpp
164 size_t MetaspaceShared::core_region_alignment() {
165 return os::cds_core_region_alignment();
166 }
167
168 size_t MetaspaceShared::protection_zone_size() {
169 return os::cds_core_region_alignment();
170 }
171
172 static bool shared_base_valid(char* shared_base) {
173 // We check user input for SharedBaseAddress at dump time.
174
175 // At CDS runtime, "shared_base" will be the (attempted) mapping start. It will also
176 // be the encoding base, since the headers of archived base objects (and with Lilliput,
177 // the prototype mark words) carry pre-computed narrow Klass IDs that refer to the mapping
178 // start as base.
179 //
180 // On AARCH64, The "shared_base" may not be later usable as encoding base, depending on the
181 // total size of the reserved area and the precomputed_narrow_klass_shift. This is checked
182 // before reserving memory. Here we weed out values already known to be invalid later.
183 return AARCH64_ONLY(is_aligned(shared_base, 4 * G)) NOT_AARCH64(true);
184 }
185
186 class DumpClassListCLDClosure : public CLDClosure {
187 static const int INITIAL_TABLE_SIZE = 1987;
188 static const int MAX_TABLE_SIZE = 61333;
189
190 fileStream *_stream;
191 ResizeableResourceHashtable<InstanceKlass*, bool,
192 AnyObj::C_HEAP, mtClassShared> _dumped_classes;
193
194 void dump(InstanceKlass* ik) {
195 bool created;
196 _dumped_classes.put_if_absent(ik, &created);
197 if (!created) {
198 return;
199 }
200 if (_dumped_classes.maybe_grow()) {
201 log_info(aot, hashtables)("Expanded _dumped_classes table to %d", _dumped_classes.table_size());
202 }
203 if (ik->java_super()) {
204 dump(ik->java_super());
205 }
206 Array<InstanceKlass*>* interfaces = ik->local_interfaces();
207 int len = interfaces->length();
208 for (int i = 0; i < len; i++) {
209 dump(interfaces->at(i));
210 }
211 ClassListWriter::write_to_stream(ik, _stream);
212 }
213
214 public:
215 DumpClassListCLDClosure(fileStream* f)
216 : CLDClosure(), _dumped_classes(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE) {
217 _stream = f;
218 }
219
220 void do_cld(ClassLoaderData* cld) {
221 for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
222 if (klass->is_instance_klass()) {
223 dump(InstanceKlass::cast(klass));
224 }
225 }
226 }
227 };
228
229 void MetaspaceShared::dump_loaded_classes(const char* file_name, TRAPS) {
230 fileStream stream(file_name, "w");
231 if (stream.is_open()) {
232 MutexLocker lock(ClassLoaderDataGraph_lock);
233 MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
234 DumpClassListCLDClosure collect_classes(&stream);
235 ClassLoaderDataGraph::loaded_cld_do(&collect_classes);
236 } else {
237 THROW_MSG(vmSymbols::java_io_IOException(), "Failed to open file");
238 }
239 }
240
241 static bool shared_base_too_high(char* specified_base, char* aligned_base, size_t cds_max) {
242 // Caller should have checked that aligned_base was successfully aligned and is not nullptr.
243 // Comparing specified_base with nullptr is UB.
244 assert(aligned_base != nullptr, "sanity");
245 assert(aligned_base >= specified_base, "sanity");
246
247 if (max_uintx - uintx(aligned_base) < uintx(cds_max)) {
248 // Not enough address space to hold an archive of cds_max bytes from aligned_base.
249 return true;
250 } else {
251 return false;
252 }
253 }
254
255 static char* compute_shared_base(size_t cds_max) {
256 char* specified_base = (char*)SharedBaseAddress;
257 size_t alignment = MetaspaceShared::core_region_alignment();
258 if (UseCompressedClassPointers) {
259 alignment = MAX2(alignment, Metaspace::reserve_alignment());
260 }
261
262 if (SharedBaseAddress == 0) {
263 // Special meaning of -XX:SharedBaseAddress=0 -> Always map archive at os-selected address.
264 return specified_base;
265 }
266
267 char* aligned_base = can_align_up(specified_base, alignment)
268 ? align_up(specified_base, alignment)
269 : nullptr;
270
271 if (aligned_base != specified_base) {
272 aot_log_info(aot)("SharedBaseAddress (" INTPTR_FORMAT ") aligned up to " INTPTR_FORMAT,
273 p2i(specified_base), p2i(aligned_base));
274 }
275
276 const char* err = nullptr;
277 if (aligned_base == nullptr) {
278 err = "too high";
279 } else if (shared_base_too_high(specified_base, aligned_base, cds_max)) {
280 err = "too high";
281 } else if (!shared_base_valid(aligned_base)) {
282 err = "invalid for this platform";
283 } else {
284 return aligned_base;
285 }
286
287 // Arguments::default_SharedBaseAddress() is hard-coded in cds_globals.hpp. It must be carefully
288 // picked that (a) the align_up() below will always return a valid value; (b) none of
289 // the following asserts will fail.
290 aot_log_warning(aot)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
291 p2i((void*)SharedBaseAddress), err,
292 p2i((void*)Arguments::default_SharedBaseAddress()));
293
294 specified_base = (char*)Arguments::default_SharedBaseAddress();
295 aligned_base = align_up(specified_base, alignment);
296
297 // Make sure the default value of SharedBaseAddress specified in globals.hpp is sane.
298 assert(!shared_base_too_high(specified_base, aligned_base, cds_max), "Sanity");
299 assert(shared_base_valid(aligned_base), "Sanity");
300 return aligned_base;
301 }
302
303 void MetaspaceShared::initialize_for_static_dump() {
304 assert(CDSConfig::is_dumping_static_archive(), "sanity");
305
306 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_final_static_archive()) {
307 if (!((UseG1GC || UseParallelGC || UseSerialGC || UseEpsilonGC || UseShenandoahGC) && UseCompressedClassPointers)) {
308 const char* error;
309 if (CDSConfig::is_dumping_preimage_static_archive()) {
310 error = "Cannot create the AOT configuration file";
311 } else {
312 error = "Cannot create the AOT cache";
313 }
314
315 vm_exit_during_initialization(error,
316 "UseCompressedClassPointers must be enabled, and collector must be G1, Parallel, Serial, Epsilon, or Shenandoah");
317 }
318 }
319
320 aot_log_info(aot)("Core region alignment: %zu", core_region_alignment());
321 // The max allowed size for CDS archive. We use this to limit SharedBaseAddress
322 // to avoid address space wrap around.
323 size_t cds_max;
324 const size_t reserve_alignment = core_region_alignment();
325
326 #ifdef _LP64
327 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
328 cds_max = align_down(UnscaledClassSpaceMax, reserve_alignment);
329 #else
330 // We don't support archives larger than 256MB on 32-bit due to limited
331 // virtual address space.
332 cds_max = align_down(256*M, reserve_alignment);
333 #endif
334
335 _requested_base_address = compute_shared_base(cds_max);
336 SharedBaseAddress = (size_t)_requested_base_address;
337
338 size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
339 _symbol_rs = MemoryReserver::reserve(symbol_rs_size,
340 os::vm_allocation_granularity(),
341 os::vm_page_size(),
342 mtClassShared);
343 if (!_symbol_rs.is_reserved()) {
344 aot_log_error(aot)("Unable to reserve memory for symbols: %zu bytes.", symbol_rs_size);
345 MetaspaceShared::unrecoverable_writing_error();
346 }
347 _symbol_region.init(&_symbol_rs, &_symbol_vs);
348 }
349
350 // Called by universe_post_init()
351 void MetaspaceShared::post_initialize(TRAPS) {
352 if (CDSConfig::is_using_archive()) {
353 int size = AOTClassLocationConfig::runtime()->length();
354 if (size > 0) {
355 CDSProtectionDomain::allocate_shared_data_arrays(size, CHECK);
356 }
357 }
358 }
359
360 // Extra java.lang.Strings to be added to the archive
361 static GrowableArrayCHeap<OopHandle, mtClassShared>* _extra_interned_strings = nullptr;
362 // Extra Symbols to be added to the archive
363 static GrowableArrayCHeap<Symbol*, mtClassShared>* _extra_symbols = nullptr;
364 // Methods managed by SystemDictionary::find_method_handle_intrinsic() to be added to the archive
365 static GrowableArray<Method*>* _pending_method_handle_intrinsics = nullptr;
366
367 void MetaspaceShared::read_extra_data(JavaThread* current, const char* filename) {
368 _extra_interned_strings = new GrowableArrayCHeap<OopHandle, mtClassShared>(10000);
369 _extra_symbols = new GrowableArrayCHeap<Symbol*, mtClassShared>(1000);
370
371 HashtableTextDump reader(filename);
372 reader.check_version("VERSION: 1.0");
373
374 while (reader.remain() > 0) {
375 int utf8_length;
376 int prefix_type = reader.scan_prefix(&utf8_length);
377 ResourceMark rm(current);
378 if (utf8_length == 0x7fffffff) {
379 // buf_len will overflown 32-bit value.
380 aot_log_error(aot)("string length too large: %d", utf8_length);
381 MetaspaceShared::unrecoverable_loading_error();
382 }
383 int buf_len = utf8_length+1;
384 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
385 reader.get_utf8(utf8_buffer, utf8_length);
386 utf8_buffer[utf8_length] = '\0';
387
388 if (prefix_type == HashtableTextDump::SymbolPrefix) {
389 _extra_symbols->append(SymbolTable::new_permanent_symbol(utf8_buffer));
390 } else{
391 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
392 ExceptionMark em(current);
393 JavaThread* THREAD = current; // For exception macros.
394 oop str = StringTable::intern(utf8_buffer, THREAD);
395
396 if (HAS_PENDING_EXCEPTION) {
397 log_warning(aot, heap)("[line %d] extra interned string allocation failed; size too large: %d",
398 reader.last_line_no(), utf8_length);
399 CLEAR_PENDING_EXCEPTION;
400 } else {
401 #if INCLUDE_CDS_JAVA_HEAP
402 if (ArchiveHeapWriter::is_string_too_large_to_archive(str)) {
403 log_warning(aot, heap)("[line %d] extra interned string ignored; size too large: %d",
404 reader.last_line_no(), utf8_length);
405 continue;
406 }
407 // Make sure this string is included in the dumped interned string table.
408 assert(str != nullptr, "must succeed");
409 _extra_interned_strings->append(OopHandle(Universe::vm_global(), str));
410 #endif
411 }
412 }
413 }
414 }
415
416 void MetaspaceShared::make_method_handle_intrinsics_shareable() {
417 for (int i = 0; i < _pending_method_handle_intrinsics->length(); i++) {
418 Method* m = ArchiveBuilder::current()->get_buffered_addr(_pending_method_handle_intrinsics->at(i));
419 m->remove_unshareable_info();
420 // Each method has its own constant pool (which is distinct from m->method_holder()->constants());
421 m->constants()->remove_unshareable_info();
422 }
423 }
424
425 void MetaspaceShared::write_method_handle_intrinsics() {
426 int len = _pending_method_handle_intrinsics->length();
427 _archived_method_handle_intrinsics = ArchiveBuilder::new_ro_array<Method*>(len);
428 int word_size = _archived_method_handle_intrinsics->size();
429 for (int i = 0; i < len; i++) {
430 Method* m = _pending_method_handle_intrinsics->at(i);
431 ArchiveBuilder::current()->write_pointer_in_buffer(_archived_method_handle_intrinsics->adr_at(i), m);
432 word_size += m->size() + m->constMethod()->size() + m->constants()->size();
433 if (m->constants()->cache() != nullptr) {
434 word_size += m->constants()->cache()->size();
435 }
436 }
437 log_info(aot)("Archived %d method handle intrinsics (%d bytes)", len, word_size * BytesPerWord);
438 }
439
440 // About "serialize" --
441 //
442 // This is (probably a badly named) way to read/write a data stream of pointers and
443 // miscellaneous data from/to the shared archive file. The usual code looks like this:
444 //
445 // // These two global C++ variables are initialized during dump time.
446 // static int _archived_int;
447 // static MetaspaceObj* archived_ptr;
448 //
449 // void MyClass::serialize(SerializeClosure* soc) {
450 // soc->do_int(&_archived_int);
451 // soc->do_int(&_archived_ptr);
452 // }
453 //
454 // At dumptime, these two variables are stored into the CDS archive.
455 // At runtime, these two variables are loaded from the CDS archive.
456 // In addition, the pointer is relocated as necessary.
457 //
458 // Some of the xxx::serialize() functions may have side effects and assume that
459 // the archive is already mapped. For example, SymbolTable::serialize_shared_table_header()
460 // unconditionally makes the set of archived symbols available. Therefore, we put most
461 // of these xxx::serialize() functions inside MetaspaceShared::serialize(), which
462 // is called AFTER we made the decision to map the archive.
463 //
464 // However, some of the "serialized" data are used to decide whether an archive should
465 // be mapped or not (e.g., for checking if the -Djdk.module.main property is compatible
466 // with the archive). The xxx::serialize() functions for these data must be put inside
467 // MetaspaceShared::early_serialize(). Such functions must not produce side effects that
468 // assume we will always decides to map the archive.
469
470 void MetaspaceShared::early_serialize(SerializeClosure* soc) {
471 int tag = 0;
472 soc->do_tag(--tag);
473 CDS_JAVA_HEAP_ONLY(Modules::serialize_archived_module_info(soc);)
474 soc->do_tag(666);
475 }
476
477 void MetaspaceShared::serialize(SerializeClosure* soc) {
478 int tag = 0;
479 soc->do_tag(--tag);
480
481 // Verify the sizes of various metadata in the system.
482 soc->do_tag(sizeof(Method));
483 soc->do_tag(sizeof(ConstMethod));
484 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
485 soc->do_tag(sizeof(ConstantPool));
486 soc->do_tag(sizeof(ConstantPoolCache));
487 soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
488 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
489 soc->do_tag(sizeof(Symbol));
490
491 // Need to do this first, as subsequent steps may call virtual functions
492 // in archived Metadata objects.
493 CppVtables::serialize(soc);
494 soc->do_tag(--tag);
495
496 // Dump/restore miscellaneous metadata.
497 JavaClasses::serialize_offsets(soc);
498 Universe::serialize(soc);
499 soc->do_tag(--tag);
500
501 // Dump/restore references to commonly used names and signatures.
502 vmSymbols::serialize(soc);
503 soc->do_tag(--tag);
504
505 // Dump/restore the symbol/string/subgraph_info tables
506 SymbolTable::serialize_shared_table_header(soc);
507 StringTable::serialize_shared_table_header(soc);
508 HeapShared::serialize_tables(soc);
509 SystemDictionaryShared::serialize_dictionary_headers(soc);
510 AOTLinkedClassBulkLoader::serialize(soc, true);
511 FinalImageRecipes::serialize(soc);
512 TrainingData::serialize(soc);
513 InstanceMirrorKlass::serialize_offsets(soc);
514
515 // Dump/restore well known classes (pointers)
516 SystemDictionaryShared::serialize_vm_classes(soc);
517 soc->do_tag(--tag);
518
519 CDS_JAVA_HEAP_ONLY(ClassLoaderDataShared::serialize(soc);)
520 soc->do_ptr((void**)&_archived_method_handle_intrinsics);
521
522 LambdaFormInvokers::serialize(soc);
523 AdapterHandlerLibrary::serialize_shared_table_header(soc);
524
525 soc->do_tag(666);
526 }
527
528 static void rewrite_nofast_bytecode(const methodHandle& method) {
529 BytecodeStream bcs(method);
530 while (!bcs.is_last_bytecode()) {
531 Bytecodes::Code opcode = bcs.next();
532 switch (opcode) {
533 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
534 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
535 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
536 case Bytecodes::_iload: {
537 if (!bcs.is_wide()) {
538 *bcs.bcp() = Bytecodes::_nofast_iload;
539 }
540 break;
541 }
542 default: break;
543 }
544 }
545 }
546
547 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
548 // at run time by RewriteBytecodes/RewriteFrequentPairs
549 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
550 void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
551 for (int i = 0; i < ik->methods()->length(); i++) {
552 methodHandle m(thread, ik->methods()->at(i));
553 if (ik->can_be_verified_at_dumptime() && ik->is_linked()) {
554 rewrite_nofast_bytecode(m);
555 }
556 Fingerprinter fp(m);
557 // The side effect of this call sets method's fingerprint field.
558 fp.fingerprint();
559 }
560 }
561
562 class VM_PopulateDumpSharedSpace : public VM_Operation {
563 private:
564 ArchiveHeapInfo _heap_info;
565 FileMapInfo* _map_info;
566 StaticArchiveBuilder& _builder;
567
568 void dump_java_heap_objects();
569 void dump_shared_symbol_table(GrowableArray<Symbol*>* symbols) {
570 log_info(aot)("Dumping symbol table ...");
571 SymbolTable::write_to_archive(symbols);
572 }
573 char* dump_early_read_only_tables();
574 char* dump_read_only_tables(AOTClassLocationConfig*& cl_config);
575
576 public:
577
578 VM_PopulateDumpSharedSpace(StaticArchiveBuilder& b) :
579 VM_Operation(), _heap_info(), _map_info(nullptr), _builder(b) {}
580
581 bool skip_operation() const { return false; }
582
583 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
584 ArchiveHeapInfo* heap_info() { return &_heap_info; }
585 FileMapInfo* map_info() const { return _map_info; }
586 void doit(); // outline because gdb sucks
587 bool allow_nested_vm_operations() const { return true; }
588 }; // class VM_PopulateDumpSharedSpace
589
590 class StaticArchiveBuilder : public ArchiveBuilder {
591 public:
592 StaticArchiveBuilder() : ArchiveBuilder() {}
593
594 virtual void iterate_roots(MetaspaceClosure* it) {
595 AOTArtifactFinder::all_cached_classes_do(it);
596 SystemDictionaryShared::dumptime_classes_do(it);
597 Universe::metaspace_pointers_do(it);
598 vmSymbols::metaspace_pointers_do(it);
599 TrainingData::iterate_roots(it);
600
601 // The above code should find all the symbols that are referenced by the
602 // archived classes. We just need to add the extra symbols which
603 // may not be used by any of the archived classes -- these are usually
604 // symbols that we anticipate to be used at run time, so we can store
605 // them in the RO region, to be shared across multiple processes.
606 if (_extra_symbols != nullptr) {
607 for (int i = 0; i < _extra_symbols->length(); i++) {
608 it->push(_extra_symbols->adr_at(i));
609 }
610 }
611
612 for (int i = 0; i < _pending_method_handle_intrinsics->length(); i++) {
613 it->push(_pending_method_handle_intrinsics->adr_at(i));
614 }
615 }
616 };
617
618 char* VM_PopulateDumpSharedSpace::dump_early_read_only_tables() {
619 ArchiveBuilder::OtherROAllocMark mark;
620
621 CDS_JAVA_HEAP_ONLY(Modules::dump_archived_module_info());
622
623 DumpRegion* ro_region = ArchiveBuilder::current()->ro_region();
624 char* start = ro_region->top();
625 WriteClosure wc(ro_region);
626 MetaspaceShared::early_serialize(&wc);
627 return start;
628 }
629
630 char* VM_PopulateDumpSharedSpace::dump_read_only_tables(AOTClassLocationConfig*& cl_config) {
631 ArchiveBuilder::OtherROAllocMark mark;
632
633 SystemDictionaryShared::write_to_archive();
634 cl_config = AOTClassLocationConfig::dumptime()->write_to_archive();
635 AOTClassLinker::write_to_archive();
636 if (CDSConfig::is_dumping_preimage_static_archive()) {
637 FinalImageRecipes::record_recipes();
638 }
639
640 TrainingData::dump_training_data();
641
642 MetaspaceShared::write_method_handle_intrinsics();
643
644 // Write lambform lines into archive
645 LambdaFormInvokers::dump_static_archive_invokers();
646
647 if (CDSConfig::is_dumping_adapters()) {
648 AdapterHandlerLibrary::dump_aot_adapter_table();
649 }
650
651 // Write the other data to the output array.
652 DumpRegion* ro_region = ArchiveBuilder::current()->ro_region();
653 char* start = ro_region->top();
654 WriteClosure wc(ro_region);
655 MetaspaceShared::serialize(&wc);
656
657 return start;
658 }
659
660 void VM_PopulateDumpSharedSpace::doit() {
661 if (!CDSConfig::is_dumping_final_static_archive()) {
662 guarantee(!CDSConfig::is_using_archive(), "We should not be using an archive when we dump");
663 }
664
665 DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
666
667 _pending_method_handle_intrinsics = new (mtClassShared) GrowableArray<Method*>(256, mtClassShared);
668 if (CDSConfig::is_dumping_method_handles()) {
669 // When dumping AOT-linked classes, some classes may have direct references to a method handle
670 // intrinsic. The easiest thing is to save all of them into the AOT cache.
671 SystemDictionary::get_all_method_handle_intrinsics(_pending_method_handle_intrinsics);
672 }
673
674 AOTClassLocationConfig::dumptime_check_nonempty_dirs();
675
676 NOT_PRODUCT(SystemDictionary::verify();)
677
678 // Block concurrent class unloading from changing the _dumptime_table
679 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
680
681 _builder.gather_source_objs();
682 _builder.reserve_buffer();
683
684 CppVtables::dumptime_init(&_builder);
685
686 _builder.sort_metadata_objs();
687 _builder.dump_rw_metadata();
688 _builder.dump_ro_metadata();
689 _builder.relocate_metaspaceobj_embedded_pointers();
690
691 log_info(aot)("Make classes shareable");
692 _builder.make_klasses_shareable();
693 MetaspaceShared::make_method_handle_intrinsics_shareable();
694
695 dump_java_heap_objects();
696 dump_shared_symbol_table(_builder.symbols());
697
698 char* early_serialized_data = dump_early_read_only_tables();
699 AOTClassLocationConfig* cl_config;
700 char* serialized_data = dump_read_only_tables(cl_config);
701
702 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
703 log_info(aot)("Adjust lambda proxy class dictionary");
704 LambdaProxyClassDictionary::adjust_dumptime_table();
705 }
706
707 log_info(cds)("Make training data shareable");
708 _builder.make_training_data_shareable();
709
710 // The vtable clones contain addresses of the current process.
711 // We don't want to write these addresses into the archive.
712 CppVtables::zero_archived_vtables();
713
714 // Write the archive file
715 if (CDSConfig::is_dumping_final_static_archive()) {
716 FileMapInfo::free_current_info(); // FIXME: should not free current info
717 }
718 const char* static_archive = CDSConfig::output_archive_path();
719 assert(static_archive != nullptr, "sanity");
720 _map_info = new FileMapInfo(static_archive, true);
721 _map_info->populate_header(MetaspaceShared::core_region_alignment());
722 _map_info->set_early_serialized_data(early_serialized_data);
723 _map_info->set_serialized_data(serialized_data);
724 _map_info->set_cloned_vtables(CppVtables::vtables_serialized_base());
725 _map_info->header()->set_class_location_config(cl_config);
726 }
727
728 class CollectClassesForLinking : public KlassClosure {
729 GrowableArray<OopHandle> _mirrors;
730
731 public:
732 CollectClassesForLinking() : _mirrors() {
733 // ClassLoaderDataGraph::loaded_classes_do_keepalive() requires ClassLoaderDataGraph_lock.
734 // We cannot link the classes while holding this lock (or else we may run into deadlock).
735 // Therefore, we need to first collect all the classes, keeping them alive by
736 // holding onto their java_mirrors in global OopHandles. We then link the classes after
737 // releasing the lock.
738 MutexLocker lock(ClassLoaderDataGraph_lock);
739 ClassLoaderDataGraph::loaded_classes_do_keepalive(this);
740 }
741
742 ~CollectClassesForLinking() {
743 for (int i = 0; i < _mirrors.length(); i++) {
744 _mirrors.at(i).release(Universe::vm_global());
745 }
746 }
747
748 void do_cld(ClassLoaderData* cld) {
749 assert(cld->is_alive(), "must be");
750 }
751
752 void do_klass(Klass* k) {
753 if (k->is_instance_klass()) {
754 _mirrors.append(OopHandle(Universe::vm_global(), k->java_mirror()));
755 }
756 }
757
758 const GrowableArray<OopHandle>* mirrors() const { return &_mirrors; }
759 };
760
761 // Check if we can eagerly link this class at dump time, so we can avoid the
762 // runtime linking overhead (especially verification)
763 bool MetaspaceShared::may_be_eagerly_linked(InstanceKlass* ik) {
764 if (CDSConfig::preserve_all_dumptime_verification_states(ik)) {
765 assert(ik->can_be_verified_at_dumptime(), "sanity");
766 }
767 if (!ik->can_be_verified_at_dumptime()) {
768 // For old classes, try to leave them in the unlinked state, so
769 // we can still store them in the archive. They must be
770 // linked/verified at runtime.
771 return false;
772 }
773 if (CDSConfig::is_dumping_dynamic_archive() && ik->defined_by_other_loaders()) {
774 // Linking of unregistered classes at this stage may cause more
775 // classes to be resolved, resulting in calls to ClassLoader.loadClass()
776 // that may not be expected by custom class loaders.
777 //
778 // It's OK to do this for the built-in loaders as we know they can
779 // tolerate this.
780 return false;
781 }
782 return true;
783 }
784
785 void MetaspaceShared::link_shared_classes(TRAPS) {
786 AOTClassLinker::initialize();
787 AOTClassInitializer::init_test_class(CHECK);
788
789 if (CDSConfig::is_dumping_final_static_archive()) {
790 FinalImageRecipes::apply_recipes(CHECK);
791 }
792
793 while (true) {
794 ResourceMark rm(THREAD);
795 CollectClassesForLinking collect_classes;
796 bool has_linked = false;
797 const GrowableArray<OopHandle>* mirrors = collect_classes.mirrors();
798 for (int i = 0; i < mirrors->length(); i++) {
799 OopHandle mirror = mirrors->at(i);
800 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror.resolve()));
801 if (may_be_eagerly_linked(ik)) {
802 has_linked |= try_link_class(THREAD, ik);
803 }
804 if (CDSConfig::is_dumping_heap() && ik->is_linked() && !ik->is_initialized()) {
805 AOTClassInitializer::maybe_preinit_class(ik, CHECK);
806 }
807 }
808
809 if (!has_linked) {
810 break;
811 }
812 // Class linking includes verification which may load more classes.
813 // Keep scanning until we have linked no more classes.
814 }
815
816 // Eargerly resolve all string constants in constant pools
817 {
818 ResourceMark rm(THREAD);
819 CollectClassesForLinking collect_classes;
820 const GrowableArray<OopHandle>* mirrors = collect_classes.mirrors();
821 for (int i = 0; i < mirrors->length(); i++) {
822 OopHandle mirror = mirrors->at(i);
823 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror.resolve()));
824 AOTConstantPoolResolver::preresolve_string_cp_entries(ik, CHECK);
825 if (CDSConfig::is_dumping_preimage_static_archive()) {
826 FinalImageRecipes::add_reflection_data_flags(ik, CHECK);
827 }
828 }
829 }
830 }
831
832 // Preload classes from a list, populate the shared spaces and dump to a
833 // file.
834 void MetaspaceShared::preload_and_dump(TRAPS) {
835 CDSConfig::DumperThreadMark dumper_thread_mark(THREAD);
836 ResourceMark rm(THREAD);
837 HandleMark hm(THREAD);
838
839 if (CDSConfig::is_dumping_final_static_archive() && AOTPrintTrainingInfo) {
840 tty->print_cr("==================== archived_training_data ** before dumping ====================");
841 TrainingData::print_archived_training_data_on(tty);
842 }
843
844 StaticArchiveBuilder builder;
845 preload_and_dump_impl(builder, THREAD);
846 if (HAS_PENDING_EXCEPTION) {
847 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
848 aot_log_error(aot)("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
849 "%zuM", MaxHeapSize/M);
850 MetaspaceShared::writing_error();
851 } else {
852 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
853 aot_log_error(aot)("%s: %s", PENDING_EXCEPTION->klass()->external_name(),
854 message == nullptr ? "(null)" : java_lang_String::as_utf8_string(message));
855 MetaspaceShared::writing_error(err_msg("Unexpected exception, use -Xlog:aot%s,exceptions=trace for detail",
856 CDSConfig::new_aot_flags_used() ? "" : ",cds"));
857 }
858 }
859
860 if (CDSConfig::new_aot_flags_used()) {
861 if (CDSConfig::is_dumping_preimage_static_archive()) {
862 // We are in the JVM that runs the training run. Continue execution,
863 // so that it can finish all clean-up and return the correct exit
864 // code to the OS.
865 } else {
866 // The JLI launcher only recognizes the "old" -Xshare:dump flag.
867 // When the new -XX:AOTMode=create flag is used, we can't return
868 // to the JLI launcher, as the launcher will fail when trying to
869 // run the main class, which is not what we want.
870 struct stat st;
871 if (os::stat(AOTCache, &st) != 0) {
872 tty->print_cr("AOTCache creation failed: %s", AOTCache);
873 } else {
874 tty->print_cr("AOTCache creation is complete: %s " INT64_FORMAT " bytes", AOTCache, (int64_t)(st.st_size));
875 }
876 vm_direct_exit(0);
877 }
878 }
879 }
880
881 #if INCLUDE_CDS_JAVA_HEAP && defined(_LP64)
882 void MetaspaceShared::adjust_heap_sizes_for_dumping() {
883 if (!CDSConfig::is_dumping_heap() || UseCompressedOops) {
884 return;
885 }
886 // CDS heap dumping requires all string oops to have an offset
887 // from the heap bottom that can be encoded in 32-bit.
888 julong max_heap_size = (julong)(4 * G);
889
890 if (MinHeapSize > max_heap_size) {
891 log_debug(aot)("Setting MinHeapSize to 4G for CDS dumping, original size = %zuM", MinHeapSize/M);
892 FLAG_SET_ERGO(MinHeapSize, max_heap_size);
893 }
894 if (InitialHeapSize > max_heap_size) {
895 log_debug(aot)("Setting InitialHeapSize to 4G for CDS dumping, original size = %zuM", InitialHeapSize/M);
896 FLAG_SET_ERGO(InitialHeapSize, max_heap_size);
897 }
898 if (MaxHeapSize > max_heap_size) {
899 log_debug(aot)("Setting MaxHeapSize to 4G for CDS dumping, original size = %zuM", MaxHeapSize/M);
900 FLAG_SET_ERGO(MaxHeapSize, max_heap_size);
901 }
902 }
903 #endif // INCLUDE_CDS_JAVA_HEAP && _LP64
904
905 void MetaspaceShared::get_default_classlist(char* default_classlist, const size_t buf_size) {
906 const char* filesep = os::file_separator();
907 jio_snprintf(default_classlist, buf_size, "%s%slib%sclasslist",
908 Arguments::get_java_home(), filesep, filesep);
909 }
910
911 void MetaspaceShared::preload_classes(TRAPS) {
912 char default_classlist[JVM_MAXPATHLEN];
913 const char* classlist_path;
914
915 get_default_classlist(default_classlist, JVM_MAXPATHLEN);
916 if (SharedClassListFile == nullptr) {
917 classlist_path = default_classlist;
918 } else {
919 classlist_path = SharedClassListFile;
920 }
921
922 aot_log_info(aot)("Loading classes to share ...");
923 ClassListParser::parse_classlist(classlist_path,
924 ClassListParser::_parse_all, CHECK);
925 if (ExtraSharedClassListFile) {
926 ClassListParser::parse_classlist(ExtraSharedClassListFile,
927 ClassListParser::_parse_all, CHECK);
928 }
929 if (classlist_path != default_classlist) {
930 struct stat statbuf;
931 if (os::stat(default_classlist, &statbuf) == 0) {
932 // File exists, let's use it.
933 ClassListParser::parse_classlist(default_classlist,
934 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
935 }
936 }
937
938 // Some classes are used at CDS runtime but are not loaded, and therefore archived, at
939 // dumptime. We can perform dummmy calls to these classes at dumptime to ensure they
940 // are archived.
941 exercise_runtime_cds_code(CHECK);
942
943 aot_log_info(aot)("Loading classes to share: done.");
944 }
945
946 void MetaspaceShared::exercise_runtime_cds_code(TRAPS) {
947 // Exercise the manifest processing code
948 const char* dummy = "Manifest-Version: 1.0\n";
949 CDSProtectionDomain::create_jar_manifest(dummy, strlen(dummy), CHECK);
950
951 // Exercise FileSystem and URL code
952 CDSProtectionDomain::to_file_URL("dummy.jar", Handle(), CHECK);
953 }
954
955 bool MetaspaceShared::is_recording_preimage_static_archive() {
956 if (CDSConfig::is_dumping_preimage_static_archive()) {
957 return _preimage_static_archive_dumped == 0;
958 }
959 return false;
960 }
961
962 jlong MetaspaceShared::get_preimage_static_archive_recording_duration() {
963 if (CDSConfig::is_dumping_preimage_static_archive()) {
964 if (_preimage_static_archive_recording_duration == 0) {
965 // The recording has not yet finished so return the current elapsed time.
966 return Management::ticks_to_ms(os::elapsed_counter());
967 }
968 return _preimage_static_archive_recording_duration;
969 }
970 return 0;
971 }
972
973 void MetaspaceShared::preload_and_dump_impl(StaticArchiveBuilder& builder, TRAPS) {
974 if (CDSConfig::is_dumping_preimage_static_archive()) {
975 if (Atomic::cmpxchg(&_preimage_static_archive_dumped, 0, 1) != 0) {
976 return;
977 }
978 _preimage_static_archive_recording_duration = Management::ticks_to_ms(os::elapsed_counter());
979 }
980
981 if (CDSConfig::is_dumping_classic_static_archive()) {
982 // We are running with -Xshare:dump
983 preload_classes(CHECK);
984
985 if (SharedArchiveConfigFile) {
986 log_info(aot)("Reading extra data from %s ...", SharedArchiveConfigFile);
987 read_extra_data(THREAD, SharedArchiveConfigFile);
988 log_info(aot)("Reading extra data: done.");
989 }
990 }
991
992 if (CDSConfig::is_dumping_preimage_static_archive()) {
993 log_info(aot)("Reading lambda form invokers from JDK default classlist ...");
994 char default_classlist[JVM_MAXPATHLEN];
995 get_default_classlist(default_classlist, JVM_MAXPATHLEN);
996 struct stat statbuf;
997 if (os::stat(default_classlist, &statbuf) == 0) {
998 ClassListParser::parse_classlist(default_classlist,
999 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
1000 }
1001 }
1002
1003 #if INCLUDE_CDS_JAVA_HEAP
1004 if (CDSConfig::is_dumping_heap()) {
1005 assert(CDSConfig::allow_only_single_java_thread(), "Required");
1006 if (!HeapShared::is_archived_boot_layer_available(THREAD)) {
1007 report_loading_error("archivedBootLayer not available, disabling full module graph");
1008 CDSConfig::stop_dumping_full_module_graph();
1009 }
1010 // Do this before link_shared_classes(), as the following line may load new classes.
1011 HeapShared::init_for_dumping(CHECK);
1012 }
1013 #endif
1014
1015 if (CDSConfig::is_dumping_final_static_archive()) {
1016 if (ExtraSharedClassListFile) {
1017 log_info(aot)("Loading extra classes from %s ...", ExtraSharedClassListFile);
1018 ClassListParser::parse_classlist(ExtraSharedClassListFile,
1019 ClassListParser::_parse_all, CHECK);
1020 }
1021 }
1022
1023 // Rewrite and link classes
1024 log_info(aot)("Rewriting and linking classes ...");
1025
1026 // Link any classes which got missed. This would happen if we have loaded classes that
1027 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1028 // fails verification, all other interfaces that were not specified in the classlist but
1029 // are implemented by K are not verified.
1030 link_shared_classes(CHECK);
1031 log_info(aot)("Rewriting and linking classes: done");
1032 TrainingData::init_dumptime_table(CHECK); // captures TrainingDataSetLocker
1033
1034 if (CDSConfig::is_dumping_regenerated_lambdaform_invokers()) {
1035 LambdaFormInvokers::regenerate_holder_classes(CHECK);
1036 }
1037
1038 #if INCLUDE_CDS_JAVA_HEAP
1039 if (CDSConfig::is_dumping_heap()) {
1040 ArchiveHeapWriter::init();
1041
1042 if (CDSConfig::is_dumping_full_module_graph()) {
1043 ClassLoaderDataShared::ensure_module_entry_tables_exist();
1044 HeapShared::reset_archived_object_states(CHECK);
1045 }
1046
1047 if (ArchiveLoaderLookupCache) {
1048 SystemDictionaryShared::create_loader_positive_lookup_cache(CHECK);
1049 }
1050
1051 AOTReferenceObjSupport::initialize(CHECK);
1052 AOTReferenceObjSupport::stabilize_cached_reference_objects(CHECK);
1053
1054 if (CDSConfig::is_initing_classes_at_dump_time()) {
1055 // java.lang.Class::reflectionFactory cannot be archived yet. We set this field
1056 // to null, and it will be initialized again at runtime.
1057 log_debug(aot)("Resetting Class::reflectionFactory");
1058 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates");
1059 Symbol* method_sig = vmSymbols::void_method_signature();
1060 JavaValue result(T_VOID);
1061 JavaCalls::call_static(&result, vmClasses::Class_klass(),
1062 method_name, method_sig, CHECK);
1063
1064 // Perhaps there is a way to avoid hard-coding these names here.
1065 // See discussion in JDK-8342481.
1066 }
1067
1068 // Do this at the very end, when no Java code will be executed. Otherwise
1069 // some new strings may be added to the intern table.
1070 StringTable::allocate_shared_strings_array(CHECK);
1071 } else {
1072 log_info(aot)("Not dumping heap, reset CDSConfig::_is_using_optimized_module_handling");
1073 CDSConfig::stop_using_optimized_module_handling();
1074 }
1075 #endif
1076
1077 VM_PopulateDumpSharedSpace op(builder);
1078 VMThread::execute(&op);
1079 FileMapInfo* mapinfo = op.map_info();
1080 ArchiveHeapInfo* heap_info = op.heap_info();
1081
1082 if (CDSConfig::is_dumping_final_static_archive()) {
1083 if (AOTCodeCache::is_caching_enabled()) {
1084 if (log_is_enabled(Info, cds, jit)) {
1085 AOTCacheAccess::test_heap_access_api();
1086 }
1087
1088 // We have just created the final image. Let's run the AOT compiler
1089 if (AOTPrintTrainingInfo) {
1090 tty->print_cr("==================== archived_training_data ** after dumping ====================");
1091 TrainingData::print_archived_training_data_on(tty);
1092 }
1093
1094 CDSConfig::enable_dumping_aot_code();
1095 {
1096 builder.start_ac_region();
1097 if (AOTCodeCache::is_dumping_code()) {
1098 Precompiler::compile_cached_code(&builder, CHECK);
1099 }
1100 // Write the contents to aot code region and close AOTCodeCache before packing the region
1101 AOTCodeCache::close();
1102 builder.end_ac_region();
1103 }
1104 CDSConfig::disable_dumping_aot_code();
1105 }
1106 }
1107
1108 bool status = write_static_archive(&builder, mapinfo, heap_info);
1109 if (status && CDSConfig::is_dumping_preimage_static_archive()) {
1110 tty->print_cr("%s AOTConfiguration recorded: %s",
1111 CDSConfig::has_temp_aot_config_file() ? "Temporary" : "", AOTConfiguration);
1112 if (CDSConfig::is_single_command_training()) {
1113 fork_and_dump_final_static_archive(CHECK);
1114 }
1115 }
1116
1117 if (!status) {
1118 THROW_MSG(vmSymbols::java_io_IOException(), "Encountered error while dumping");
1119 }
1120 }
1121
1122 bool MetaspaceShared::write_static_archive(ArchiveBuilder* builder, FileMapInfo* map_info, ArchiveHeapInfo* heap_info) {
1123 // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
1124 // without runtime relocation.
1125 builder->relocate_to_requested();
1126
1127 map_info->open_as_output();
1128 if (!map_info->is_open()) {
1129 return false;
1130 }
1131 builder->write_archive(map_info, heap_info);
1132
1133 if (AllowArchivingWithJavaAgent) {
1134 aot_log_warning(aot)("This %s was created with AllowArchivingWithJavaAgent. It should be used "
1135 "for testing purposes only and should not be used in a production environment", CDSConfig::type_of_archive_being_loaded());
1136 }
1137 return true;
1138 }
1139
1140 static void print_java_launcher(outputStream* st) {
1141 st->print("%s%sbin%sjava", Arguments::get_java_home(), os::file_separator(), os::file_separator());
1142 }
1143
1144 static void append_args(GrowableArray<Handle>* args, const char* arg, TRAPS) {
1145 Handle string = java_lang_String::create_from_str(arg, CHECK);
1146 args->append(string);
1147 }
1148
1149 // Pass all options in Arguments::jvm_args_array() to a child JVM process
1150 // using the JAVA_TOOL_OPTIONS environment variable.
1151 static int exec_jvm_with_java_tool_options(const char* java_launcher_path, TRAPS) {
1152 ResourceMark rm(THREAD);
1153 HandleMark hm(THREAD);
1154 GrowableArray<Handle> args;
1155
1156 const char* cp = Arguments::get_appclasspath();
1157 if (cp != nullptr && strlen(cp) > 0 && strcmp(cp, ".") != 0) {
1158 // We cannot use "-cp", because "-cp" is only interpreted by the java launcher,
1159 // and is not interpreter by arguments.cpp when it loads args from JAVA_TOOL_OPTIONS
1160 stringStream ss;
1161 ss.print("-Djava.class.path=");
1162 ss.print_raw(cp);
1163 append_args(&args, ss.freeze(), CHECK_0);
1164 // CDS$ProcessLauncher::execWithJavaToolOptions() must unset CLASSPATH, which has
1165 // a higher priority than -Djava.class.path=
1166 }
1167
1168 // Pass all arguments. These include those from JAVA_TOOL_OPTIONS and _JAVA_OPTIONS.
1169 for (int i = 0; i < Arguments::num_jvm_args(); i++) {
1170 const char* arg = Arguments::jvm_args_array()[i];
1171 if (strstr(arg, "-XX:AOTCacheOutput=") == arg || // arg starts with ...
1172 strstr(arg, "-XX:AOTConfiguration=") == arg ||
1173 strstr(arg, "-XX:AOTMode=") == arg) {
1174 // Filter these out. They wiill be set below.
1175 } else {
1176 append_args(&args, arg, CHECK_0);
1177 }
1178 }
1179
1180 // Note: because we are running in AOTMode=record, JDK_AOT_VM_OPTIONS have not been
1181 // parsed, so they are not in Arguments::jvm_args_array. If JDK_AOT_VM_OPTIONS is in
1182 // the environment, it will be inherited and parsed by the child JVM process
1183 // in Arguments::parse_java_tool_options_environment_variable().
1184 precond(strcmp(AOTMode, "record") == 0);
1185
1186 // We don't pass Arguments::jvm_flags_array(), as those will be added by
1187 // the child process when it loads .hotspotrc
1188
1189 {
1190 // If AOTCacheOutput contains %p, it should have been already substituted with the
1191 // pid of the training process.
1192 stringStream ss;
1193 ss.print("-XX:AOTCacheOutput=");
1194 ss.print_raw(AOTCacheOutput);
1195 append_args(&args, ss.freeze(), CHECK_0);
1196 }
1197 {
1198 // If AOTCacheConfiguration contains %p, it should have been already substituted with the
1199 // pid of the training process.
1200 // If AOTCacheConfiguration was not explicitly specified, it should have been assigned a
1201 // temporary file name.
1202 stringStream ss;
1203 ss.print("-XX:AOTConfiguration=");
1204 ss.print_raw(AOTConfiguration);
1205 append_args(&args, ss.freeze(), CHECK_0);
1206 }
1207
1208 append_args(&args, "-XX:AOTMode=create", CHECK_0);
1209
1210 Symbol* klass_name = SymbolTable::new_symbol("jdk/internal/misc/CDS$ProcessLauncher");
1211 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, CHECK_0);
1212 Symbol* methodName = SymbolTable::new_symbol("execWithJavaToolOptions");
1213 Symbol* methodSignature = SymbolTable::new_symbol("(Ljava/lang/String;[Ljava/lang/String;)I");
1214
1215 Handle launcher = java_lang_String::create_from_str(java_launcher_path, CHECK_0);
1216 objArrayOop array = oopFactory::new_objArray(vmClasses::String_klass(), args.length(), CHECK_0);
1217 for (int i = 0; i < args.length(); i++) {
1218 array->obj_at_put(i, args.at(i)());
1219 }
1220 objArrayHandle launcher_args(THREAD, array);
1221
1222 // The following call will pass all options inside the JAVA_TOOL_OPTIONS env variable to
1223 // the child process. It will also clear the _JAVA_OPTIONS and CLASSPATH env variables for
1224 // the child process.
1225 //
1226 // Note: the env variables are set only for the child process. They are not changed
1227 // for the current process. See java.lang.ProcessBuilder::environment().
1228 JavaValue result(T_OBJECT);
1229 JavaCallArguments javacall_args(2);
1230 javacall_args.push_oop(launcher);
1231 javacall_args.push_oop(launcher_args);
1232 JavaCalls::call_static(&result,
1233 InstanceKlass::cast(k),
1234 methodName,
1235 methodSignature,
1236 &javacall_args,
1237 CHECK_0);
1238 return result.get_jint();
1239 }
1240
1241 void MetaspaceShared::fork_and_dump_final_static_archive(TRAPS) {
1242 assert(CDSConfig::is_dumping_preimage_static_archive(), "sanity");
1243
1244 ResourceMark rm;
1245 stringStream ss;
1246 print_java_launcher(&ss);
1247 const char* cmd = ss.freeze();
1248 tty->print_cr("Launching child process %s to assemble AOT cache %s using configuration %s", cmd, AOTCacheOutput, AOTConfiguration);
1249 int status = exec_jvm_with_java_tool_options(cmd, CHECK);
1250 if (status != 0) {
1251 log_error(aot)("Child process failed; status = %d", status);
1252 // We leave the temp config file for debugging
1253 } else if (CDSConfig::has_temp_aot_config_file()) {
1254 const char* tmp_config = AOTConfiguration;
1255 // On Windows, need WRITE permission to remove the file.
1256 WINDOWS_ONLY(chmod(tmp_config, _S_IREAD | _S_IWRITE));
1257 status = remove(tmp_config);
1258 if (status != 0) {
1259 log_error(aot)("Failed to remove temporary AOT configuration file %s", tmp_config);
1260 } else {
1261 tty->print_cr("Removed temporary AOT configuration file %s", tmp_config);
1262 }
1263 }
1264 }
1265
1266 // Returns true if the class's status has changed.
1267 bool MetaspaceShared::try_link_class(JavaThread* current, InstanceKlass* ik) {
1268 ExceptionMark em(current);
1269 JavaThread* THREAD = current; // For exception macros.
1270 assert(CDSConfig::is_dumping_archive(), "sanity");
1271
1272 if (ik->is_shared() && !CDSConfig::is_dumping_final_static_archive()) {
1273 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1274 return false;
1275 }
1276
1277 if (ik->is_loaded() && !ik->is_linked() && ik->can_be_verified_at_dumptime() &&
1278 !SystemDictionaryShared::has_class_failed_verification(ik)) {
1279 bool saved = BytecodeVerificationLocal;
1280 if (ik->defined_by_other_loaders() && ik->class_loader() == nullptr) {
1281 // The verification decision is based on BytecodeVerificationRemote
1282 // for non-system classes. Since we are using the null classloader
1283 // to load non-system classes for customized class loaders during dumping,
1284 // we need to temporarily change BytecodeVerificationLocal to be the same as
1285 // BytecodeVerificationRemote. Note this can cause the parent system
1286 // classes also being verified. The extra overhead is acceptable during
1287 // dumping.
1288 BytecodeVerificationLocal = BytecodeVerificationRemote;
1289 }
1290 ik->link_class(THREAD);
1291 if (HAS_PENDING_EXCEPTION) {
1292 ResourceMark rm(THREAD);
1293 aot_log_warning(aot)("Preload Warning: Verification failed for %s",
1294 ik->external_name());
1295 CLEAR_PENDING_EXCEPTION;
1296 SystemDictionaryShared::set_class_has_failed_verification(ik);
1297 } else {
1298 assert(!SystemDictionaryShared::has_class_failed_verification(ik), "sanity");
1299 ik->compute_has_loops_flag_for_methods();
1300 }
1301 BytecodeVerificationLocal = saved;
1302 return true;
1303 } else {
1304 return false;
1305 }
1306 }
1307
1308 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1309 if (CDSConfig::is_dumping_heap()) {
1310 HeapShared::write_heap(&_heap_info);
1311 } else if (!CDSConfig::is_dumping_preimage_static_archive()) {
1312 CDSConfig::log_reasons_for_not_dumping_heap();
1313 }
1314 }
1315
1316 void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
1317 assert(base <= static_top && static_top <= top, "must be");
1318 _shared_metaspace_static_top = static_top;
1319 MetaspaceObj::set_shared_metaspace_range(base, top);
1320 }
1321
1322 bool MetaspaceShared::is_shared_dynamic(void* p) {
1323 if ((p < MetaspaceObj::shared_metaspace_top()) &&
1324 (p >= _shared_metaspace_static_top)) {
1325 return true;
1326 } else {
1327 return false;
1328 }
1329 }
1330
1331 bool MetaspaceShared::is_shared_static(void* p) {
1332 if (is_in_shared_metaspace(p) && !is_shared_dynamic(p)) {
1333 return true;
1334 } else {
1335 return false;
1336 }
1337 }
1338
1339 // This function is called when the JVM is unable to load the specified archive(s) due to one
1340 // of the following conditions.
1341 // - There's an error that indicates that the archive(s) files were corrupt or otherwise damaged.
1342 // - When -XX:+RequireSharedSpaces is specified, AND the JVM cannot load the archive(s) due
1343 // to version or classpath mismatch.
1344 void MetaspaceShared::unrecoverable_loading_error(const char* message) {
1345 report_loading_error("%s", message);
1346
1347 if (CDSConfig::is_dumping_final_static_archive()) {
1348 vm_exit_during_initialization("Must be a valid AOT configuration generated by the current JVM", AOTConfiguration);
1349 } else if (CDSConfig::new_aot_flags_used()) {
1350 vm_exit_during_initialization("Unable to use AOT cache.", nullptr);
1351 } else {
1352 vm_exit_during_initialization("Unable to use shared archive.", nullptr);
1353 }
1354 }
1355
1356 void MetaspaceShared::report_loading_error(const char* format, ...) {
1357 // When using AOT cache, errors messages are always printed on the error channel.
1358 LogStream ls_aot(LogLevel::Error, LogTagSetMapping<LOG_TAGS(aot)>::tagset());
1359
1360 // If we are loading load the default CDS archive, it may fail due to incompatible VM options.
1361 // Print at the info level to avoid excessive verbosity.
1362 // However, if the user has specified a CDS archive (or AOT cache), they would be interested in
1363 // knowing that the loading fails, so we print at the error level.
1364 LogLevelType level = (!CDSConfig::is_using_archive() || CDSConfig::is_using_only_default_archive()) ?
1365 LogLevel::Info : LogLevel::Error;
1366 LogStream ls_cds(level, LogTagSetMapping<LOG_TAGS(cds)>::tagset());
1367
1368 LogStream& ls = CDSConfig::new_aot_flags_used() ? ls_aot : ls_cds;
1369 va_list ap;
1370 va_start(ap, format);
1371
1372 static bool printed_error = false;
1373 if (!printed_error) { // No need for locks. Loading error checks happen only in main thread.
1374 ls.print_cr("An error has occurred while processing the %s. Run with -Xlog:%s for details.",
1375 CDSConfig::type_of_archive_being_loaded(), CDSConfig::new_aot_flags_used() ? "aot" : "aot,cds");
1376 printed_error = true;
1377 }
1378 ls.vprint_cr(format, ap);
1379
1380 va_end(ap);
1381 }
1382
1383 // This function is called when the JVM is unable to write the specified CDS archive due to an
1384 // unrecoverable error.
1385 void MetaspaceShared::unrecoverable_writing_error(const char* message) {
1386 writing_error(message);
1387 vm_direct_exit(1);
1388 }
1389
1390 // This function is called when the JVM is unable to write the specified CDS archive due to a
1391 // an error. The error will be propagated
1392 void MetaspaceShared::writing_error(const char* message) {
1393 aot_log_error(aot)("An error has occurred while writing the shared archive file.");
1394 if (message != nullptr) {
1395 aot_log_error(aot)("%s", message);
1396 }
1397 }
1398
1399 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
1400 assert(CDSConfig::is_using_archive(), "Must be called when UseSharedSpaces is enabled");
1401 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1402
1403 FileMapInfo* static_mapinfo = FileMapInfo::current_info();
1404 FileMapInfo* dynamic_mapinfo = nullptr;
1405
1406 if (static_mapinfo != nullptr) {
1407 aot_log_info(aot)("Core region alignment: %zu", static_mapinfo->core_region_alignment());
1408 dynamic_mapinfo = open_dynamic_archive();
1409
1410 aot_log_info(aot)("ArchiveRelocationMode: %d", ArchiveRelocationMode);
1411
1412 // First try to map at the requested address
1413 result = map_archives(static_mapinfo, dynamic_mapinfo, true);
1414 if (result == MAP_ARCHIVE_MMAP_FAILURE) {
1415 // Mapping has failed (probably due to ASLR). Let's map at an address chosen
1416 // by the OS.
1417 aot_log_info(aot)("Try to map archive(s) at an alternative address");
1418 result = map_archives(static_mapinfo, dynamic_mapinfo, false);
1419 }
1420 }
1421
1422 if (result == MAP_ARCHIVE_SUCCESS) {
1423 bool dynamic_mapped = (dynamic_mapinfo != nullptr && dynamic_mapinfo->is_mapped());
1424 char* cds_base = static_mapinfo->mapped_base();
1425 char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
1426 // Register CDS memory region with LSan.
1427 LSAN_REGISTER_ROOT_REGION(cds_base, cds_end - cds_base);
1428 set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
1429 _relocation_delta = static_mapinfo->relocation_delta();
1430 _requested_base_address = static_mapinfo->requested_base_address();
1431 if (dynamic_mapped) {
1432 // turn AutoCreateSharedArchive off if successfully mapped
1433 AutoCreateSharedArchive = false;
1434 }
1435 } else {
1436 set_shared_metaspace_range(nullptr, nullptr, nullptr);
1437 if (CDSConfig::is_dumping_dynamic_archive()) {
1438 aot_log_warning(aot)("-XX:ArchiveClassesAtExit is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
1439 }
1440 UseSharedSpaces = false;
1441 // The base archive cannot be mapped. We cannot dump the dynamic shared archive.
1442 AutoCreateSharedArchive = false;
1443 CDSConfig::disable_dumping_dynamic_archive();
1444 if (PrintSharedArchiveAndExit) {
1445 MetaspaceShared::unrecoverable_loading_error("Unable to use shared archive.");
1446 } else {
1447 if (RequireSharedSpaces) {
1448 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1449 } else {
1450 report_loading_error("Unable to map shared spaces");
1451 }
1452 }
1453 }
1454
1455 // If mapping failed and -XShare:on, the vm should exit
1456 bool has_failed = false;
1457 if (static_mapinfo != nullptr && !static_mapinfo->is_mapped()) {
1458 has_failed = true;
1459 delete static_mapinfo;
1460 }
1461 if (dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped()) {
1462 has_failed = true;
1463 delete dynamic_mapinfo;
1464 }
1465 if (RequireSharedSpaces && has_failed) {
1466 // static archive mapped but dynamic archive failed
1467 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1468 }
1469 }
1470
1471 // This is called very early at VM start up to get the size of the cached_code region
1472 void MetaspaceShared::open_static_archive() {
1473 if (!UseSharedSpaces) { // FIXME -- is this still needed??
1474 return;
1475 }
1476 const char* static_archive = CDSConfig::input_static_archive_path();
1477 assert(static_archive != nullptr, "sanity");
1478 FileMapInfo* mapinfo = new FileMapInfo(static_archive, true);
1479 if (!mapinfo->open_as_input()) {
1480 delete(mapinfo);
1481 } else {
1482 FileMapRegion* r = mapinfo->region_at(MetaspaceShared::ac);
1483 AOTCacheAccess::set_aot_code_region_size(r->used_aligned());
1484 }
1485 }
1486
1487 FileMapInfo* MetaspaceShared::open_dynamic_archive() {
1488 if (CDSConfig::is_dumping_dynamic_archive()) {
1489 return nullptr;
1490 }
1491 const char* dynamic_archive = CDSConfig::input_dynamic_archive_path();
1492 if (dynamic_archive == nullptr) {
1493 return nullptr;
1494 }
1495
1496 FileMapInfo* mapinfo = new FileMapInfo(dynamic_archive, false);
1497 if (!mapinfo->open_as_input()) {
1498 delete(mapinfo);
1499 if (RequireSharedSpaces) {
1500 MetaspaceShared::unrecoverable_loading_error("Failed to initialize dynamic archive");
1501 }
1502 return nullptr;
1503 }
1504 return mapinfo;
1505 }
1506
1507 // use_requested_addr:
1508 // true = map at FileMapHeader::_requested_base_address
1509 // false = map at an alternative address picked by OS.
1510 MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
1511 bool use_requested_addr) {
1512 if (use_requested_addr && static_mapinfo->requested_base_address() == nullptr) {
1513 aot_log_info(aot)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
1514 return MAP_ARCHIVE_MMAP_FAILURE;
1515 }
1516
1517 PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1518 // For product build only -- this is for benchmarking the cost of doing relocation.
1519 // For debug builds, the check is done below, after reserving the space, for better test coverage
1520 // (see comment below).
1521 aot_log_info(aot)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1522 return MAP_ARCHIVE_MMAP_FAILURE;
1523 });
1524
1525 if (ArchiveRelocationMode == 2 && !use_requested_addr) {
1526 aot_log_info(aot)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
1527 return MAP_ARCHIVE_MMAP_FAILURE;
1528 };
1529
1530 if (dynamic_mapinfo != nullptr) {
1531 // Ensure that the OS won't be able to allocate new memory spaces between the two
1532 // archives, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1533 assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
1534 }
1535
1536 ReservedSpace total_space_rs, archive_space_rs, class_space_rs;
1537 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1538 size_t prot_zone_size = 0;
1539 char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo,
1540 dynamic_mapinfo,
1541 use_requested_addr,
1542 total_space_rs,
1543 archive_space_rs,
1544 class_space_rs);
1545 if (mapped_base_address == nullptr) {
1546 result = MAP_ARCHIVE_MMAP_FAILURE;
1547 aot_log_debug(aot)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
1548 } else {
1549
1550 if (Metaspace::using_class_space()) {
1551 prot_zone_size = protection_zone_size();
1552 }
1553
1554 #ifdef ASSERT
1555 // Some sanity checks after reserving address spaces for archives
1556 // and class space.
1557 assert(archive_space_rs.is_reserved(), "Sanity");
1558 if (Metaspace::using_class_space()) {
1559 assert(archive_space_rs.base() == mapped_base_address &&
1560 archive_space_rs.size() > protection_zone_size(),
1561 "Archive space must lead and include the protection zone");
1562 // Class space must closely follow the archive space. Both spaces
1563 // must be aligned correctly.
1564 assert(class_space_rs.is_reserved() && class_space_rs.size() > 0,
1565 "A class space should have been reserved");
1566 assert(class_space_rs.base() >= archive_space_rs.end(),
1567 "class space should follow the cds archive space");
1568 assert(is_aligned(archive_space_rs.base(),
1569 core_region_alignment()),
1570 "Archive space misaligned");
1571 assert(is_aligned(class_space_rs.base(),
1572 Metaspace::reserve_alignment()),
1573 "class space misaligned");
1574 }
1575 #endif // ASSERT
1576
1577 aot_log_info(aot)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (%zu) bytes%s",
1578 p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size(),
1579 (prot_zone_size > 0 ? " (includes protection zone)" : ""));
1580 aot_log_info(aot)("Reserved class_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (%zu) bytes",
1581 p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
1582
1583 if (MetaspaceShared::use_windows_memory_mapping()) {
1584 // We have now reserved address space for the archives, and will map in
1585 // the archive files into this space.
1586 //
1587 // Special handling for Windows: on Windows we cannot map a file view
1588 // into an existing memory mapping. So, we unmap the address range we
1589 // just reserved again, which will make it available for mapping the
1590 // archives.
1591 // Reserving this range has not been for naught however since it makes
1592 // us reasonably sure the address range is available.
1593 //
1594 // But still it may fail, since between unmapping the range and mapping
1595 // in the archive someone else may grab the address space. Therefore
1596 // there is a fallback in FileMap::map_region() where we just read in
1597 // the archive files sequentially instead of mapping it in. We couple
1598 // this with use_requested_addr, since we're going to patch all the
1599 // pointers anyway so there's no benefit to mmap.
1600 if (use_requested_addr) {
1601 assert(!total_space_rs.is_reserved(), "Should not be reserved for Windows");
1602 aot_log_info(aot)("Windows mmap workaround: releasing archive space.");
1603 MemoryReserver::release(archive_space_rs);
1604 // Mark as not reserved
1605 archive_space_rs = {};
1606 // The protection zone is part of the archive:
1607 // See comment above, the Windows way of loading CDS is to mmap the individual
1608 // parts of the archive into the address region we just vacated. The protection
1609 // zone will not be mapped (and, in fact, does not exist as physical region in
1610 // the archive). Therefore, after removing the archive space above, we must
1611 // re-reserve the protection zone part lest something else gets mapped into that
1612 // area later.
1613 if (prot_zone_size > 0) {
1614 assert(prot_zone_size >= os::vm_allocation_granularity(), "must be"); // not just page size!
1615 char* p = os::attempt_reserve_memory_at(mapped_base_address, prot_zone_size,
1616 mtClassShared);
1617 assert(p == mapped_base_address || p == nullptr, "must be");
1618 if (p == nullptr) {
1619 aot_log_debug(aot)("Failed to re-reserve protection zone");
1620 return MAP_ARCHIVE_MMAP_FAILURE;
1621 }
1622 }
1623 }
1624 }
1625
1626 if (prot_zone_size > 0) {
1627 os::commit_memory(mapped_base_address, prot_zone_size, false); // will later be protected
1628 // Before mapping the core regions into the newly established address space, we mark
1629 // start and the end of the future protection zone with canaries. That way we easily
1630 // catch mapping errors (accidentally mapping data into the future protection zone).
1631 *(mapped_base_address) = 'P';
1632 *(mapped_base_address + prot_zone_size - 1) = 'P';
1633 }
1634
1635 MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
1636 MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
1637 map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
1638
1639 DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1640 // This is for simulating mmap failures at the requested address. In
1641 // debug builds, we do it here (after all archives have possibly been
1642 // mapped), so we can thoroughly test the code for failure handling
1643 // (releasing all allocated resource, etc).
1644 aot_log_info(aot)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1645 if (static_result == MAP_ARCHIVE_SUCCESS) {
1646 static_result = MAP_ARCHIVE_MMAP_FAILURE;
1647 }
1648 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1649 dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
1650 }
1651 });
1652
1653 if (static_result == MAP_ARCHIVE_SUCCESS) {
1654 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1655 result = MAP_ARCHIVE_SUCCESS;
1656 } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
1657 assert(dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped(), "must have failed");
1658 // No need to retry mapping the dynamic archive again, as it will never succeed
1659 // (bad file, etc) -- just keep the base archive.
1660 log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
1661 dynamic_mapinfo->full_path());
1662 result = MAP_ARCHIVE_SUCCESS;
1663 // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
1664 // easy API to do that right now.
1665 } else {
1666 result = MAP_ARCHIVE_MMAP_FAILURE;
1667 }
1668 } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
1669 result = MAP_ARCHIVE_OTHER_FAILURE;
1670 } else {
1671 result = MAP_ARCHIVE_MMAP_FAILURE;
1672 }
1673 }
1674
1675 if (result == MAP_ARCHIVE_SUCCESS) {
1676 SharedBaseAddress = (size_t)mapped_base_address;
1677 #ifdef _LP64
1678 if (Metaspace::using_class_space()) {
1679 assert(prot_zone_size > 0 &&
1680 *(mapped_base_address) == 'P' &&
1681 *(mapped_base_address + prot_zone_size - 1) == 'P',
1682 "Protection zone was overwritten?");
1683 // Set up ccs in metaspace.
1684 Metaspace::initialize_class_space(class_space_rs);
1685
1686 // Set up compressed Klass pointer encoding: the encoding range must
1687 // cover both archive and class space.
1688 const address encoding_base = (address)mapped_base_address;
1689 const address klass_range_start = encoding_base + prot_zone_size;
1690 const size_t klass_range_size = (address)class_space_rs.end() - klass_range_start;
1691 if (INCLUDE_CDS_JAVA_HEAP || UseCompactObjectHeaders) {
1692 // The CDS archive may contain narrow Klass IDs that were precomputed at archive generation time:
1693 // - every archived java object header (only if INCLUDE_CDS_JAVA_HEAP)
1694 // - every archived Klass' prototype (only if +UseCompactObjectHeaders)
1695 //
1696 // In order for those IDs to still be valid, we need to dictate base and shift: base should be the
1697 // mapping start (including protection zone), shift should be the shift used at archive generation time.
1698 CompressedKlassPointers::initialize_for_given_encoding(
1699 klass_range_start, klass_range_size,
1700 encoding_base, ArchiveBuilder::precomputed_narrow_klass_shift() // precomputed encoding, see ArchiveBuilder
1701 );
1702 } else {
1703 // Let JVM freely choose encoding base and shift
1704 CompressedKlassPointers::initialize(klass_range_start, klass_range_size);
1705 }
1706 CompressedKlassPointers::establish_protection_zone(encoding_base, prot_zone_size);
1707
1708 // map_or_load_heap_region() compares the current narrow oop and klass encodings
1709 // with the archived ones, so it must be done after all encodings are determined.
1710 static_mapinfo->map_or_load_heap_region();
1711 }
1712 #endif // _LP64
1713 log_info(aot)("initial optimized module handling: %s", CDSConfig::is_using_optimized_module_handling() ? "enabled" : "disabled");
1714 log_info(aot)("initial full module graph: %s", CDSConfig::is_using_full_module_graph() ? "enabled" : "disabled");
1715 } else {
1716 unmap_archive(static_mapinfo);
1717 unmap_archive(dynamic_mapinfo);
1718 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1719 }
1720
1721 return result;
1722 }
1723
1724
1725 // This will reserve two address spaces suitable to house Klass structures, one
1726 // for the cds archives (static archive and optionally dynamic archive) and
1727 // optionally one move for ccs.
1728 //
1729 // Since both spaces must fall within the compressed class pointer encoding
1730 // range, they are allocated close to each other.
1731 //
1732 // Space for archives will be reserved first, followed by a potential gap,
1733 // followed by the space for ccs:
1734 //
1735 // +-- Base address A B End
1736 // | | | |
1737 // v v v v
1738 // +-------------+--------------+ +----------------------+
1739 // | static arc | [dyn. arch] | [gap] | compr. class space |
1740 // +-------------+--------------+ +----------------------+
1741 //
1742 // (The gap may result from different alignment requirements between metaspace
1743 // and CDS)
1744 //
1745 // If UseCompressedClassPointers is disabled, only one address space will be
1746 // reserved:
1747 //
1748 // +-- Base address End
1749 // | |
1750 // v v
1751 // +-------------+--------------+
1752 // | static arc | [dyn. arch] |
1753 // +-------------+--------------+
1754 //
1755 // Base address: If use_archive_base_addr address is true, the Base address is
1756 // determined by the address stored in the static archive. If
1757 // use_archive_base_addr address is false, this base address is determined
1758 // by the platform.
1759 //
1760 // If UseCompressedClassPointers=1, the range encompassing both spaces will be
1761 // suitable to en/decode narrow Klass pointers: the base will be valid for
1762 // encoding, the range [Base, End) and not surpass the max. range for that encoding.
1763 //
1764 // Return:
1765 //
1766 // - On success:
1767 // - total_space_rs will be reserved as whole for archive_space_rs and
1768 // class_space_rs if UseCompressedClassPointers is true.
1769 // On Windows, try reserve archive_space_rs and class_space_rs
1770 // separately first if use_archive_base_addr is true.
1771 // - archive_space_rs will be reserved and large enough to host static and
1772 // if needed dynamic archive: [Base, A).
1773 // archive_space_rs.base and size will be aligned to CDS reserve
1774 // granularity.
1775 // - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
1776 // be reserved. Its start address will be aligned to metaspace reserve
1777 // alignment, which may differ from CDS alignment. It will follow the cds
1778 // archive space, close enough such that narrow class pointer encoding
1779 // covers both spaces.
1780 // If UseCompressedClassPointers=0, class_space_rs remains unreserved.
1781 // - On error: null is returned and the spaces remain unreserved.
1782 char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
1783 FileMapInfo* dynamic_mapinfo,
1784 bool use_archive_base_addr,
1785 ReservedSpace& total_space_rs,
1786 ReservedSpace& archive_space_rs,
1787 ReservedSpace& class_space_rs) {
1788
1789 address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : nullptr);
1790 const size_t archive_space_alignment = core_region_alignment();
1791
1792 // Size and requested location of the archive_space_rs (for both static and dynamic archives)
1793 size_t archive_end_offset = (dynamic_mapinfo == nullptr) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
1794 size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
1795
1796 if (!Metaspace::using_class_space()) {
1797 // Get the simple case out of the way first:
1798 // no compressed class space, simple allocation.
1799
1800 // When running without class space, requested archive base should be aligned to cds core alignment.
1801 assert(is_aligned(base_address, archive_space_alignment),
1802 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1803 p2i(base_address), archive_space_alignment);
1804
1805 archive_space_rs = MemoryReserver::reserve((char*)base_address,
1806 archive_space_size,
1807 archive_space_alignment,
1808 os::vm_page_size(),
1809 mtNone);
1810 if (archive_space_rs.is_reserved()) {
1811 assert(base_address == nullptr ||
1812 (address)archive_space_rs.base() == base_address, "Sanity");
1813 // Register archive space with NMT.
1814 MemTracker::record_virtual_memory_tag(archive_space_rs, mtClassShared);
1815 return archive_space_rs.base();
1816 }
1817 return nullptr;
1818 }
1819
1820 #ifdef _LP64
1821
1822 // Complex case: two spaces adjacent to each other, both to be addressable
1823 // with narrow class pointers.
1824 // We reserve the whole range spanning both spaces, then split that range up.
1825
1826 const size_t class_space_alignment = Metaspace::reserve_alignment();
1827
1828 // When running with class space, requested archive base must satisfy both cds core alignment
1829 // and class space alignment.
1830 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1831 assert(is_aligned(base_address, base_address_alignment),
1832 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1833 p2i(base_address), base_address_alignment);
1834
1835 size_t class_space_size = CompressedClassSpaceSize;
1836 assert(CompressedClassSpaceSize > 0 &&
1837 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1838 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1839
1840 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1841 const size_t gap_size = ccs_begin_offset - archive_space_size;
1842
1843 // Reduce class space size if it would not fit into the Klass encoding range
1844 constexpr size_t max_encoding_range_size = 4 * G;
1845 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1846 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1847 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1848 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1849 CompressedClassSpaceSize, class_space_size);
1850 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1851 }
1852
1853 const size_t total_range_size =
1854 archive_space_size + gap_size + class_space_size;
1855
1856 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1857 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1858 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1859 total_range_size)) {
1860 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1861 p2i(base_address), precomputed_narrow_klass_shift);
1862 use_archive_base_addr = false;
1863 }
1864
1865 assert(total_range_size > ccs_begin_offset, "must be");
1866 if (use_windows_memory_mapping() && use_archive_base_addr) {
1867 if (base_address != nullptr) {
1868 // On Windows, we cannot safely split a reserved memory space into two (see JDK-8255917).
1869 // Hence, we optimistically reserve archive space and class space side-by-side. We only
1870 // do this for use_archive_base_addr=true since for use_archive_base_addr=false case
1871 // caller will not split the combined space for mapping, instead read the archive data
1872 // via sequential file IO.
1873 address ccs_base = base_address + archive_space_size + gap_size;
1874 archive_space_rs = MemoryReserver::reserve((char*)base_address,
1875 archive_space_size,
1876 archive_space_alignment,
1877 os::vm_page_size(),
1878 mtNone);
1879 class_space_rs = MemoryReserver::reserve((char*)ccs_base,
1880 class_space_size,
1881 class_space_alignment,
1882 os::vm_page_size(),
1883 mtNone);
1884 }
1885 if (!archive_space_rs.is_reserved() || !class_space_rs.is_reserved()) {
1886 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1887 return nullptr;
1888 }
1889 MemTracker::record_virtual_memory_tag(archive_space_rs, mtClassShared);
1890 MemTracker::record_virtual_memory_tag(class_space_rs, mtClass);
1891 } else {
1892 if (use_archive_base_addr && base_address != nullptr) {
1893 total_space_rs = MemoryReserver::reserve((char*) base_address,
1894 total_range_size,
1895 base_address_alignment,
1896 os::vm_page_size(),
1897 mtNone);
1898 } else {
1899 // We did not manage to reserve at the preferred address, or were instructed to relocate. In that
1900 // case we reserve wherever possible, but the start address needs to be encodable as narrow Klass
1901 // encoding base since the archived heap objects contain narrow Klass IDs pre-calculated toward the start
1902 // of the shared Metaspace. That prevents us from using zero-based encoding and therefore we won't
1903 // try allocating in low-address regions.
1904 total_space_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size, false /* optimize_for_zero_base */);
1905 }
1906
1907 if (!total_space_rs.is_reserved()) {
1908 return nullptr;
1909 }
1910
1911 // Paranoid checks:
1912 assert(!use_archive_base_addr || (address)total_space_rs.base() == base_address,
1913 "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_space_rs.base()));
1914 assert(is_aligned(total_space_rs.base(), base_address_alignment), "Sanity");
1915 assert(total_space_rs.size() == total_range_size, "Sanity");
1916
1917 // Now split up the space into ccs and cds archive. For simplicity, just leave
1918 // the gap reserved at the end of the archive space. Do not do real splitting.
1919 archive_space_rs = total_space_rs.first_part(ccs_begin_offset,
1920 (size_t)archive_space_alignment);
1921 class_space_rs = total_space_rs.last_part(ccs_begin_offset);
1922 MemTracker::record_virtual_memory_split_reserved(total_space_rs.base(), total_space_rs.size(),
1923 ccs_begin_offset, mtClassShared, mtClass);
1924 }
1925 assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
1926 assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
1927 assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
1928 assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
1929
1930
1931 return archive_space_rs.base();
1932
1933 #else
1934 ShouldNotReachHere();
1935 return nullptr;
1936 #endif
1937
1938 }
1939
1940 void MetaspaceShared::release_reserved_spaces(ReservedSpace& total_space_rs,
1941 ReservedSpace& archive_space_rs,
1942 ReservedSpace& class_space_rs) {
1943 if (total_space_rs.is_reserved()) {
1944 aot_log_debug(aot)("Released shared space (archive + class) " INTPTR_FORMAT, p2i(total_space_rs.base()));
1945 MemoryReserver::release(total_space_rs);
1946 total_space_rs = {};
1947 } else {
1948 if (archive_space_rs.is_reserved()) {
1949 aot_log_debug(aot)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
1950 MemoryReserver::release(archive_space_rs);
1951 archive_space_rs = {};
1952 }
1953 if (class_space_rs.is_reserved()) {
1954 aot_log_debug(aot)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
1955 MemoryReserver::release(class_space_rs);
1956 class_space_rs = {};
1957 }
1958 }
1959 }
1960
1961 static int archive_regions[] = { MetaspaceShared::rw, MetaspaceShared::ro };
1962 static int archive_regions_count = 2;
1963
1964 MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
1965 assert(CDSConfig::is_using_archive(), "must be runtime");
1966 if (mapinfo == nullptr) {
1967 return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
1968 }
1969
1970 if (!mapinfo->validate_aot_class_linking()) {
1971 return MAP_ARCHIVE_OTHER_FAILURE;
1972 }
1973
1974 mapinfo->set_is_mapped(false);
1975 if (mapinfo->core_region_alignment() != (size_t)core_region_alignment()) {
1976 report_loading_error("Unable to map CDS archive -- core_region_alignment() expected: %zu"
1977 " actual: %zu", mapinfo->core_region_alignment(), core_region_alignment());
1978 return MAP_ARCHIVE_OTHER_FAILURE;
1979 }
1980
1981 MapArchiveResult result =
1982 mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
1983
1984 if (result != MAP_ARCHIVE_SUCCESS) {
1985 unmap_archive(mapinfo);
1986 return result;
1987 }
1988
1989 if (!mapinfo->validate_class_location()) {
1990 unmap_archive(mapinfo);
1991 return MAP_ARCHIVE_OTHER_FAILURE;
1992 }
1993
1994 if (mapinfo->is_static()) {
1995 // Currently, only static archive uses early serialized data.
1996 char* buffer = mapinfo->early_serialized_data();
1997 intptr_t* array = (intptr_t*)buffer;
1998 ReadClosure rc(&array, (intptr_t)mapped_base_address);
1999 early_serialize(&rc);
2000 }
2001
2002 if (!mapinfo->validate_aot_class_linking()) {
2003 unmap_archive(mapinfo);
2004 return MAP_ARCHIVE_OTHER_FAILURE;
2005 }
2006
2007 mapinfo->set_is_mapped(true);
2008 return MAP_ARCHIVE_SUCCESS;
2009 }
2010
2011 void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
2012 assert(CDSConfig::is_using_archive(), "must be runtime");
2013 if (mapinfo != nullptr) {
2014 mapinfo->unmap_regions(archive_regions, archive_regions_count);
2015 mapinfo->unmap_region(MetaspaceShared::bm);
2016 mapinfo->set_is_mapped(false);
2017 }
2018 }
2019
2020 // For -XX:PrintSharedArchiveAndExit
2021 class CountSharedSymbols : public SymbolClosure {
2022 private:
2023 int _count;
2024 public:
2025 CountSharedSymbols() : _count(0) {}
2026 void do_symbol(Symbol** sym) {
2027 _count++;
2028 }
2029 int total() { return _count; }
2030
2031 };
2032
2033 // Read the miscellaneous data from the shared file, and
2034 // serialize it out to its various destinations.
2035
2036 void MetaspaceShared::initialize_shared_spaces() {
2037 FileMapInfo *static_mapinfo = FileMapInfo::current_info();
2038
2039 // Verify various attributes of the archive, plus initialize the
2040 // shared string/symbol tables.
2041 char* buffer = static_mapinfo->serialized_data();
2042 intptr_t* array = (intptr_t*)buffer;
2043 ReadClosure rc(&array, (intptr_t)SharedBaseAddress);
2044 serialize(&rc);
2045
2046 // Finish up archived heap initialization. These must be
2047 // done after ReadClosure.
2048 static_mapinfo->patch_heap_embedded_pointers();
2049 ArchiveHeapLoader::finish_initialization();
2050 Universe::load_archived_object_instances();
2051 AOTCodeCache::initialize();
2052
2053 // Close the mapinfo file
2054 static_mapinfo->close();
2055
2056 static_mapinfo->unmap_region(MetaspaceShared::bm);
2057
2058 FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
2059 if (dynamic_mapinfo != nullptr) {
2060 intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
2061 ReadClosure rc(&buffer, (intptr_t)SharedBaseAddress);
2062 ArchiveBuilder::serialize_dynamic_archivable_items(&rc);
2063 DynamicArchive::setup_array_klasses();
2064 dynamic_mapinfo->close();
2065 dynamic_mapinfo->unmap_region(MetaspaceShared::bm);
2066 }
2067
2068 LogStreamHandle(Info, aot) lsh;
2069 if (lsh.is_enabled()) {
2070 lsh.print("Using AOT-linked classes: %s (static archive: %s aot-linked classes",
2071 BOOL_TO_STR(CDSConfig::is_using_aot_linked_classes()),
2072 static_mapinfo->header()->has_aot_linked_classes() ? "has" : "no");
2073 if (dynamic_mapinfo != nullptr) {
2074 lsh.print(", dynamic archive: %s aot-linked classes",
2075 dynamic_mapinfo->header()->has_aot_linked_classes() ? "has" : "no");
2076 }
2077 lsh.print_cr(")");
2078 }
2079
2080 // Set up LambdaFormInvokers::_lambdaform_lines for dynamic dump
2081 if (CDSConfig::is_dumping_dynamic_archive()) {
2082 // Read stored LF format lines stored in static archive
2083 LambdaFormInvokers::read_static_archive_invokers();
2084 }
2085
2086 if (PrintSharedArchiveAndExit) {
2087 // Print archive names
2088 if (dynamic_mapinfo != nullptr) {
2089 tty->print_cr("\n\nBase archive name: %s", CDSConfig::input_static_archive_path());
2090 tty->print_cr("Base archive version %d", static_mapinfo->version());
2091 } else {
2092 tty->print_cr("Static archive name: %s", static_mapinfo->full_path());
2093 tty->print_cr("Static archive version %d", static_mapinfo->version());
2094 }
2095
2096 SystemDictionaryShared::print_shared_archive(tty);
2097 if (dynamic_mapinfo != nullptr) {
2098 tty->print_cr("\n\nDynamic archive name: %s", dynamic_mapinfo->full_path());
2099 tty->print_cr("Dynamic archive version %d", dynamic_mapinfo->version());
2100 SystemDictionaryShared::print_shared_archive(tty, false/*dynamic*/);
2101 }
2102
2103 TrainingData::print_archived_training_data_on(tty);
2104
2105 if (AOTCodeCache::is_on_for_use()) {
2106 tty->print_cr("\n\nAOT Code");
2107 AOTCodeCache::print_on(tty);
2108 }
2109
2110 // collect shared symbols and strings
2111 CountSharedSymbols cl;
2112 SymbolTable::shared_symbols_do(&cl);
2113 tty->print_cr("Number of shared symbols: %d", cl.total());
2114 tty->print_cr("Number of shared strings: %zu", StringTable::shared_entry_count());
2115 tty->print_cr("VM version: %s\r\n", static_mapinfo->vm_version());
2116 if (FileMapInfo::current_info() == nullptr || _archive_loading_failed) {
2117 tty->print_cr("archive is invalid");
2118 vm_exit(1);
2119 } else {
2120 tty->print_cr("archive is valid");
2121 vm_exit(0);
2122 }
2123 }
2124 }
2125
2126 // JVM/TI RedefineClasses() support:
2127 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2128 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2129
2130 if (CDSConfig::is_using_archive()) {
2131 // remap the shared readonly space to shared readwrite, private
2132 FileMapInfo* mapinfo = FileMapInfo::current_info();
2133 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2134 return false;
2135 }
2136 if (FileMapInfo::dynamic_info() != nullptr) {
2137 mapinfo = FileMapInfo::dynamic_info();
2138 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2139 return false;
2140 }
2141 }
2142 _remapped_readwrite = true;
2143 }
2144 return true;
2145 }
2146
2147 void MetaspaceShared::print_on(outputStream* st) {
2148 if (CDSConfig::is_using_archive()) {
2149 st->print("CDS archive(s) mapped at: ");
2150 address base = (address)MetaspaceObj::shared_metaspace_base();
2151 address static_top = (address)_shared_metaspace_static_top;
2152 address top = (address)MetaspaceObj::shared_metaspace_top();
2153 st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
2154 st->print("size %zu, ", top - base);
2155 st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, ArchiveRelocationMode);
2156 } else {
2157 st->print("CDS archive(s) not mapped");
2158 }
2159 st->cr();
2160 }