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 HeapShared::delete_tables_with_raw_oops();
728 }
729
730 class CollectClassesForLinking : public KlassClosure {
731 GrowableArray<OopHandle> _mirrors;
732
733 public:
734 CollectClassesForLinking() : _mirrors() {
735 // ClassLoaderDataGraph::loaded_classes_do_keepalive() requires ClassLoaderDataGraph_lock.
736 // We cannot link the classes while holding this lock (or else we may run into deadlock).
737 // Therefore, we need to first collect all the classes, keeping them alive by
738 // holding onto their java_mirrors in global OopHandles. We then link the classes after
739 // releasing the lock.
740 MutexLocker lock(ClassLoaderDataGraph_lock);
741 ClassLoaderDataGraph::loaded_classes_do_keepalive(this);
742 }
743
744 ~CollectClassesForLinking() {
745 for (int i = 0; i < _mirrors.length(); i++) {
746 _mirrors.at(i).release(Universe::vm_global());
747 }
748 }
749
750 void do_cld(ClassLoaderData* cld) {
751 assert(cld->is_alive(), "must be");
752 }
753
754 void do_klass(Klass* k) {
755 if (k->is_instance_klass()) {
756 _mirrors.append(OopHandle(Universe::vm_global(), k->java_mirror()));
757 }
758 }
759
760 const GrowableArray<OopHandle>* mirrors() const { return &_mirrors; }
761 };
762
763 // Check if we can eagerly link this class at dump time, so we can avoid the
764 // runtime linking overhead (especially verification)
765 bool MetaspaceShared::may_be_eagerly_linked(InstanceKlass* ik) {
766 if (CDSConfig::preserve_all_dumptime_verification_states(ik)) {
767 assert(ik->can_be_verified_at_dumptime(), "sanity");
768 }
769 if (!ik->can_be_verified_at_dumptime()) {
770 // For old classes, try to leave them in the unlinked state, so
771 // we can still store them in the archive. They must be
772 // linked/verified at runtime.
773 return false;
774 }
775 if (CDSConfig::is_dumping_dynamic_archive() && ik->defined_by_other_loaders()) {
776 // Linking of unregistered classes at this stage may cause more
777 // classes to be resolved, resulting in calls to ClassLoader.loadClass()
778 // that may not be expected by custom class loaders.
779 //
780 // It's OK to do this for the built-in loaders as we know they can
781 // tolerate this.
782 return false;
783 }
784 return true;
785 }
786
787 void MetaspaceShared::link_shared_classes(TRAPS) {
788 AOTClassLinker::initialize();
789 AOTClassInitializer::init_test_class(CHECK);
790
791 if (CDSConfig::is_dumping_final_static_archive()) {
792 FinalImageRecipes::apply_recipes(CHECK);
793 }
794
795 while (true) {
796 ResourceMark rm(THREAD);
797 CollectClassesForLinking collect_classes;
798 bool has_linked = false;
799 const GrowableArray<OopHandle>* mirrors = collect_classes.mirrors();
800 for (int i = 0; i < mirrors->length(); i++) {
801 OopHandle mirror = mirrors->at(i);
802 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror.resolve()));
803 if (may_be_eagerly_linked(ik)) {
804 has_linked |= try_link_class(THREAD, ik);
805 }
806 if (CDSConfig::is_dumping_heap() && ik->is_linked() && !ik->is_initialized()) {
807 AOTClassInitializer::maybe_preinit_class(ik, CHECK);
808 }
809 }
810
811 if (!has_linked) {
812 break;
813 }
814 // Class linking includes verification which may load more classes.
815 // Keep scanning until we have linked no more classes.
816 }
817
818 // Eargerly resolve all string constants in constant pools
819 {
820 ResourceMark rm(THREAD);
821 CollectClassesForLinking collect_classes;
822 const GrowableArray<OopHandle>* mirrors = collect_classes.mirrors();
823 for (int i = 0; i < mirrors->length(); i++) {
824 OopHandle mirror = mirrors->at(i);
825 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror.resolve()));
826 AOTConstantPoolResolver::preresolve_string_cp_entries(ik, CHECK);
827 if (CDSConfig::is_dumping_preimage_static_archive()) {
828 FinalImageRecipes::add_reflection_data_flags(ik, CHECK);
829 }
830 }
831 }
832 }
833
834 // Preload classes from a list, populate the shared spaces and dump to a
835 // file.
836 void MetaspaceShared::preload_and_dump(TRAPS) {
837 CDSConfig::DumperThreadMark dumper_thread_mark(THREAD);
838 ResourceMark rm(THREAD);
839 HandleMark hm(THREAD);
840
841 if (CDSConfig::is_dumping_final_static_archive() && AOTPrintTrainingInfo) {
842 tty->print_cr("==================== archived_training_data ** before dumping ====================");
843 TrainingData::print_archived_training_data_on(tty);
844 }
845
846 StaticArchiveBuilder builder;
847 preload_and_dump_impl(builder, THREAD);
848 if (HAS_PENDING_EXCEPTION) {
849 if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
850 aot_log_error(aot)("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
851 "%zuM", MaxHeapSize/M);
852 MetaspaceShared::writing_error();
853 } else {
854 oop message = java_lang_Throwable::message(PENDING_EXCEPTION);
855 aot_log_error(aot)("%s: %s", PENDING_EXCEPTION->klass()->external_name(),
856 message == nullptr ? "(null)" : java_lang_String::as_utf8_string(message));
857 MetaspaceShared::writing_error(err_msg("Unexpected exception, use -Xlog:aot%s,exceptions=trace for detail",
858 CDSConfig::new_aot_flags_used() ? "" : ",cds"));
859 }
860 }
861
862 if (CDSConfig::new_aot_flags_used()) {
863 if (CDSConfig::is_dumping_preimage_static_archive()) {
864 // We are in the JVM that runs the training run. Continue execution,
865 // so that it can finish all clean-up and return the correct exit
866 // code to the OS.
867 } else {
868 // The JLI launcher only recognizes the "old" -Xshare:dump flag.
869 // When the new -XX:AOTMode=create flag is used, we can't return
870 // to the JLI launcher, as the launcher will fail when trying to
871 // run the main class, which is not what we want.
872 struct stat st;
873 if (os::stat(AOTCache, &st) != 0) {
874 tty->print_cr("AOTCache creation failed: %s", AOTCache);
875 } else {
876 tty->print_cr("AOTCache creation is complete: %s " INT64_FORMAT " bytes", AOTCache, (int64_t)(st.st_size));
877 }
878 vm_direct_exit(0);
879 }
880 }
881 }
882
883 #if INCLUDE_CDS_JAVA_HEAP && defined(_LP64)
884 void MetaspaceShared::adjust_heap_sizes_for_dumping() {
885 if (!CDSConfig::is_dumping_heap() || UseCompressedOops) {
886 return;
887 }
888 // CDS heap dumping requires all string oops to have an offset
889 // from the heap bottom that can be encoded in 32-bit.
890 julong max_heap_size = (julong)(4 * G);
891
892 if (MinHeapSize > max_heap_size) {
893 log_debug(aot)("Setting MinHeapSize to 4G for CDS dumping, original size = %zuM", MinHeapSize/M);
894 FLAG_SET_ERGO(MinHeapSize, max_heap_size);
895 }
896 if (InitialHeapSize > max_heap_size) {
897 log_debug(aot)("Setting InitialHeapSize to 4G for CDS dumping, original size = %zuM", InitialHeapSize/M);
898 FLAG_SET_ERGO(InitialHeapSize, max_heap_size);
899 }
900 if (MaxHeapSize > max_heap_size) {
901 log_debug(aot)("Setting MaxHeapSize to 4G for CDS dumping, original size = %zuM", MaxHeapSize/M);
902 FLAG_SET_ERGO(MaxHeapSize, max_heap_size);
903 }
904 }
905 #endif // INCLUDE_CDS_JAVA_HEAP && _LP64
906
907 void MetaspaceShared::get_default_classlist(char* default_classlist, const size_t buf_size) {
908 const char* filesep = os::file_separator();
909 jio_snprintf(default_classlist, buf_size, "%s%slib%sclasslist",
910 Arguments::get_java_home(), filesep, filesep);
911 }
912
913 void MetaspaceShared::preload_classes(TRAPS) {
914 char default_classlist[JVM_MAXPATHLEN];
915 const char* classlist_path;
916
917 get_default_classlist(default_classlist, JVM_MAXPATHLEN);
918 if (SharedClassListFile == nullptr) {
919 classlist_path = default_classlist;
920 } else {
921 classlist_path = SharedClassListFile;
922 }
923
924 aot_log_info(aot)("Loading classes to share ...");
925 ClassListParser::parse_classlist(classlist_path,
926 ClassListParser::_parse_all, CHECK);
927 if (ExtraSharedClassListFile) {
928 ClassListParser::parse_classlist(ExtraSharedClassListFile,
929 ClassListParser::_parse_all, CHECK);
930 }
931 if (classlist_path != default_classlist) {
932 struct stat statbuf;
933 if (os::stat(default_classlist, &statbuf) == 0) {
934 // File exists, let's use it.
935 ClassListParser::parse_classlist(default_classlist,
936 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
937 }
938 }
939
940 // Some classes are used at CDS runtime but are not loaded, and therefore archived, at
941 // dumptime. We can perform dummmy calls to these classes at dumptime to ensure they
942 // are archived.
943 exercise_runtime_cds_code(CHECK);
944
945 aot_log_info(aot)("Loading classes to share: done.");
946 }
947
948 void MetaspaceShared::exercise_runtime_cds_code(TRAPS) {
949 // Exercise the manifest processing code
950 const char* dummy = "Manifest-Version: 1.0\n";
951 CDSProtectionDomain::create_jar_manifest(dummy, strlen(dummy), CHECK);
952
953 // Exercise FileSystem and URL code
954 CDSProtectionDomain::to_file_URL("dummy.jar", Handle(), CHECK);
955 }
956
957 bool MetaspaceShared::is_recording_preimage_static_archive() {
958 if (CDSConfig::is_dumping_preimage_static_archive()) {
959 return _preimage_static_archive_dumped == 0;
960 }
961 return false;
962 }
963
964 jlong MetaspaceShared::get_preimage_static_archive_recording_duration() {
965 if (CDSConfig::is_dumping_preimage_static_archive()) {
966 if (_preimage_static_archive_recording_duration == 0) {
967 // The recording has not yet finished so return the current elapsed time.
968 return Management::ticks_to_ms(os::elapsed_counter());
969 }
970 return _preimage_static_archive_recording_duration;
971 }
972 return 0;
973 }
974
975 void MetaspaceShared::preload_and_dump_impl(StaticArchiveBuilder& builder, TRAPS) {
976 if (CDSConfig::is_dumping_preimage_static_archive()) {
977 if (Atomic::cmpxchg(&_preimage_static_archive_dumped, 0, 1) != 0) {
978 return;
979 }
980 _preimage_static_archive_recording_duration = Management::ticks_to_ms(os::elapsed_counter());
981 }
982
983 if (CDSConfig::is_dumping_classic_static_archive()) {
984 // We are running with -Xshare:dump
985 preload_classes(CHECK);
986
987 if (SharedArchiveConfigFile) {
988 log_info(aot)("Reading extra data from %s ...", SharedArchiveConfigFile);
989 read_extra_data(THREAD, SharedArchiveConfigFile);
990 log_info(aot)("Reading extra data: done.");
991 }
992 }
993
994 if (CDSConfig::is_dumping_preimage_static_archive()) {
995 log_info(aot)("Reading lambda form invokers from JDK default classlist ...");
996 char default_classlist[JVM_MAXPATHLEN];
997 get_default_classlist(default_classlist, JVM_MAXPATHLEN);
998 struct stat statbuf;
999 if (os::stat(default_classlist, &statbuf) == 0) {
1000 ClassListParser::parse_classlist(default_classlist,
1001 ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
1002 }
1003 }
1004
1005 #if INCLUDE_CDS_JAVA_HEAP
1006 if (CDSConfig::is_dumping_heap()) {
1007 assert(CDSConfig::allow_only_single_java_thread(), "Required");
1008 if (!HeapShared::is_archived_boot_layer_available(THREAD)) {
1009 report_loading_error("archivedBootLayer not available, disabling full module graph");
1010 CDSConfig::stop_dumping_full_module_graph();
1011 }
1012 // Do this before link_shared_classes(), as the following line may load new classes.
1013 HeapShared::init_for_dumping(CHECK);
1014 }
1015 #endif
1016
1017 if (CDSConfig::is_dumping_final_static_archive()) {
1018 if (ExtraSharedClassListFile) {
1019 log_info(aot)("Loading extra classes from %s ...", ExtraSharedClassListFile);
1020 ClassListParser::parse_classlist(ExtraSharedClassListFile,
1021 ClassListParser::_parse_all, CHECK);
1022 }
1023 }
1024
1025 // Rewrite and link classes
1026 log_info(aot)("Rewriting and linking classes ...");
1027
1028 // Link any classes which got missed. This would happen if we have loaded classes that
1029 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
1030 // fails verification, all other interfaces that were not specified in the classlist but
1031 // are implemented by K are not verified.
1032 link_shared_classes(CHECK);
1033 log_info(aot)("Rewriting and linking classes: done");
1034 TrainingData::init_dumptime_table(CHECK); // captures TrainingDataSetLocker
1035
1036 if (CDSConfig::is_dumping_regenerated_lambdaform_invokers()) {
1037 LambdaFormInvokers::regenerate_holder_classes(CHECK);
1038 }
1039
1040 #if INCLUDE_CDS_JAVA_HEAP
1041 if (CDSConfig::is_dumping_heap()) {
1042 ArchiveHeapWriter::init();
1043
1044 if (CDSConfig::is_dumping_full_module_graph()) {
1045 ClassLoaderDataShared::ensure_module_entry_tables_exist();
1046 HeapShared::reset_archived_object_states(CHECK);
1047 }
1048
1049 if (ArchiveLoaderLookupCache) {
1050 SystemDictionaryShared::create_loader_positive_lookup_cache(CHECK);
1051 }
1052
1053 AOTReferenceObjSupport::initialize(CHECK);
1054 AOTReferenceObjSupport::stabilize_cached_reference_objects(CHECK);
1055
1056 if (CDSConfig::is_initing_classes_at_dump_time()) {
1057 // java.lang.Class::reflectionFactory cannot be archived yet. We set this field
1058 // to null, and it will be initialized again at runtime.
1059 log_debug(aot)("Resetting Class::reflectionFactory");
1060 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates");
1061 Symbol* method_sig = vmSymbols::void_method_signature();
1062 JavaValue result(T_VOID);
1063 JavaCalls::call_static(&result, vmClasses::Class_klass(),
1064 method_name, method_sig, CHECK);
1065
1066 // Perhaps there is a way to avoid hard-coding these names here.
1067 // See discussion in JDK-8342481.
1068 }
1069
1070 // Do this at the very end, when no Java code will be executed. Otherwise
1071 // some new strings may be added to the intern table.
1072 StringTable::allocate_shared_strings_array(CHECK);
1073 } else {
1074 log_info(aot)("Not dumping heap, reset CDSConfig::_is_using_optimized_module_handling");
1075 CDSConfig::stop_using_optimized_module_handling();
1076 }
1077 #endif
1078
1079 VM_PopulateDumpSharedSpace op(builder);
1080 VMThread::execute(&op);
1081 FileMapInfo* mapinfo = op.map_info();
1082 ArchiveHeapInfo* heap_info = op.heap_info();
1083
1084 if (CDSConfig::is_dumping_final_static_archive()) {
1085 if (AOTCodeCache::is_caching_enabled()) {
1086 if (log_is_enabled(Info, cds, jit)) {
1087 AOTCacheAccess::test_heap_access_api();
1088 }
1089
1090 // We have just created the final image. Let's run the AOT compiler
1091 if (AOTPrintTrainingInfo) {
1092 tty->print_cr("==================== archived_training_data ** after dumping ====================");
1093 TrainingData::print_archived_training_data_on(tty);
1094 }
1095
1096 {
1097 builder.start_ac_region();
1098 if (AOTCodeCache::is_dumping_code()) {
1099 CDSConfig::enable_dumping_aot_code();
1100 log_info(aot)("Compiling AOT code");
1101 Precompiler::compile_aot_code(&builder, CHECK);
1102 log_info(aot)("Finished compiling AOT code");
1103 CDSConfig::disable_dumping_aot_code();
1104 }
1105 // Write the contents to aot code region and close AOTCodeCache before packing the region
1106 AOTCodeCache::close();
1107 log_info(aot)("Dumped AOT code Cache");
1108 builder.end_ac_region();
1109 }
1110 }
1111 }
1112
1113 bool status = write_static_archive(&builder, mapinfo, heap_info);
1114 if (status && CDSConfig::is_dumping_preimage_static_archive()) {
1115 tty->print_cr("%s AOTConfiguration recorded: %s",
1116 CDSConfig::has_temp_aot_config_file() ? "Temporary" : "", AOTConfiguration);
1117 if (CDSConfig::is_single_command_training()) {
1118 fork_and_dump_final_static_archive(CHECK);
1119 }
1120 }
1121
1122 if (!status) {
1123 THROW_MSG(vmSymbols::java_io_IOException(), "Encountered error while dumping");
1124 }
1125 }
1126
1127 bool MetaspaceShared::write_static_archive(ArchiveBuilder* builder, FileMapInfo* map_info, ArchiveHeapInfo* heap_info) {
1128 // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
1129 // without runtime relocation.
1130 builder->relocate_to_requested();
1131
1132 map_info->open_as_output();
1133 if (!map_info->is_open()) {
1134 return false;
1135 }
1136 builder->write_archive(map_info, heap_info);
1137
1138 if (AllowArchivingWithJavaAgent) {
1139 aot_log_warning(aot)("This %s was created with AllowArchivingWithJavaAgent. It should be used "
1140 "for testing purposes only and should not be used in a production environment", CDSConfig::type_of_archive_being_loaded());
1141 }
1142 return true;
1143 }
1144
1145 static void print_java_launcher(outputStream* st) {
1146 st->print("%s%sbin%sjava", Arguments::get_java_home(), os::file_separator(), os::file_separator());
1147 }
1148
1149 static void append_args(GrowableArray<Handle>* args, const char* arg, TRAPS) {
1150 Handle string = java_lang_String::create_from_str(arg, CHECK);
1151 args->append(string);
1152 }
1153
1154 // Pass all options in Arguments::jvm_args_array() to a child JVM process
1155 // using the JAVA_TOOL_OPTIONS environment variable.
1156 static int exec_jvm_with_java_tool_options(const char* java_launcher_path, TRAPS) {
1157 ResourceMark rm(THREAD);
1158 HandleMark hm(THREAD);
1159 GrowableArray<Handle> args;
1160
1161 const char* cp = Arguments::get_appclasspath();
1162 if (cp != nullptr && strlen(cp) > 0 && strcmp(cp, ".") != 0) {
1163 // We cannot use "-cp", because "-cp" is only interpreted by the java launcher,
1164 // and is not interpreter by arguments.cpp when it loads args from JAVA_TOOL_OPTIONS
1165 stringStream ss;
1166 ss.print("-Djava.class.path=");
1167 ss.print_raw(cp);
1168 append_args(&args, ss.freeze(), CHECK_0);
1169 // CDS$ProcessLauncher::execWithJavaToolOptions() must unset CLASSPATH, which has
1170 // a higher priority than -Djava.class.path=
1171 }
1172
1173 // Pass all arguments. These include those from JAVA_TOOL_OPTIONS and _JAVA_OPTIONS.
1174 for (int i = 0; i < Arguments::num_jvm_args(); i++) {
1175 const char* arg = Arguments::jvm_args_array()[i];
1176 if (strstr(arg, "-XX:AOTCacheOutput=") == arg || // arg starts with ...
1177 strstr(arg, "-XX:AOTConfiguration=") == arg ||
1178 strstr(arg, "-XX:AOTMode=") == arg) {
1179 // Filter these out. They wiill be set below.
1180 } else {
1181 append_args(&args, arg, CHECK_0);
1182 }
1183 }
1184
1185 // Note: because we are running in AOTMode=record, JDK_AOT_VM_OPTIONS have not been
1186 // parsed, so they are not in Arguments::jvm_args_array. If JDK_AOT_VM_OPTIONS is in
1187 // the environment, it will be inherited and parsed by the child JVM process
1188 // in Arguments::parse_java_tool_options_environment_variable().
1189 precond(strcmp(AOTMode, "record") == 0);
1190
1191 // We don't pass Arguments::jvm_flags_array(), as those will be added by
1192 // the child process when it loads .hotspotrc
1193
1194 {
1195 // If AOTCacheOutput contains %p, it should have been already substituted with the
1196 // pid of the training process.
1197 stringStream ss;
1198 ss.print("-XX:AOTCacheOutput=");
1199 ss.print_raw(AOTCacheOutput);
1200 append_args(&args, ss.freeze(), CHECK_0);
1201 }
1202 {
1203 // If AOTCacheConfiguration contains %p, it should have been already substituted with the
1204 // pid of the training process.
1205 // If AOTCacheConfiguration was not explicitly specified, it should have been assigned a
1206 // temporary file name.
1207 stringStream ss;
1208 ss.print("-XX:AOTConfiguration=");
1209 ss.print_raw(AOTConfiguration);
1210 append_args(&args, ss.freeze(), CHECK_0);
1211 }
1212
1213 append_args(&args, "-XX:AOTMode=create", CHECK_0);
1214
1215 Symbol* klass_name = SymbolTable::new_symbol("jdk/internal/misc/CDS$ProcessLauncher");
1216 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, CHECK_0);
1217 Symbol* methodName = SymbolTable::new_symbol("execWithJavaToolOptions");
1218 Symbol* methodSignature = SymbolTable::new_symbol("(Ljava/lang/String;[Ljava/lang/String;)I");
1219
1220 Handle launcher = java_lang_String::create_from_str(java_launcher_path, CHECK_0);
1221 objArrayOop array = oopFactory::new_objArray(vmClasses::String_klass(), args.length(), CHECK_0);
1222 for (int i = 0; i < args.length(); i++) {
1223 array->obj_at_put(i, args.at(i)());
1224 }
1225 objArrayHandle launcher_args(THREAD, array);
1226
1227 // The following call will pass all options inside the JAVA_TOOL_OPTIONS env variable to
1228 // the child process. It will also clear the _JAVA_OPTIONS and CLASSPATH env variables for
1229 // the child process.
1230 //
1231 // Note: the env variables are set only for the child process. They are not changed
1232 // for the current process. See java.lang.ProcessBuilder::environment().
1233 JavaValue result(T_OBJECT);
1234 JavaCallArguments javacall_args(2);
1235 javacall_args.push_oop(launcher);
1236 javacall_args.push_oop(launcher_args);
1237 JavaCalls::call_static(&result,
1238 InstanceKlass::cast(k),
1239 methodName,
1240 methodSignature,
1241 &javacall_args,
1242 CHECK_0);
1243 return result.get_jint();
1244 }
1245
1246 void MetaspaceShared::fork_and_dump_final_static_archive(TRAPS) {
1247 assert(CDSConfig::is_dumping_preimage_static_archive(), "sanity");
1248
1249 ResourceMark rm;
1250 stringStream ss;
1251 print_java_launcher(&ss);
1252 const char* cmd = ss.freeze();
1253 tty->print_cr("Launching child process %s to assemble AOT cache %s using configuration %s", cmd, AOTCacheOutput, AOTConfiguration);
1254 int status = exec_jvm_with_java_tool_options(cmd, CHECK);
1255 if (status != 0) {
1256 log_error(aot)("Child process failed; status = %d", status);
1257 // We leave the temp config file for debugging
1258 } else if (CDSConfig::has_temp_aot_config_file()) {
1259 const char* tmp_config = AOTConfiguration;
1260 // On Windows, need WRITE permission to remove the file.
1261 WINDOWS_ONLY(chmod(tmp_config, _S_IREAD | _S_IWRITE));
1262 status = remove(tmp_config);
1263 if (status != 0) {
1264 log_error(aot)("Failed to remove temporary AOT configuration file %s", tmp_config);
1265 } else {
1266 tty->print_cr("Removed temporary AOT configuration file %s", tmp_config);
1267 }
1268 }
1269 }
1270
1271 // Returns true if the class's status has changed.
1272 bool MetaspaceShared::try_link_class(JavaThread* current, InstanceKlass* ik) {
1273 ExceptionMark em(current);
1274 JavaThread* THREAD = current; // For exception macros.
1275 assert(CDSConfig::is_dumping_archive(), "sanity");
1276
1277 if (ik->is_shared() && !CDSConfig::is_dumping_final_static_archive()) {
1278 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1279 return false;
1280 }
1281
1282 if (ik->is_loaded() && !ik->is_linked() && ik->can_be_verified_at_dumptime() &&
1283 !SystemDictionaryShared::has_class_failed_verification(ik)) {
1284 bool saved = BytecodeVerificationLocal;
1285 if (ik->defined_by_other_loaders() && ik->class_loader() == nullptr) {
1286 // The verification decision is based on BytecodeVerificationRemote
1287 // for non-system classes. Since we are using the null classloader
1288 // to load non-system classes for customized class loaders during dumping,
1289 // we need to temporarily change BytecodeVerificationLocal to be the same as
1290 // BytecodeVerificationRemote. Note this can cause the parent system
1291 // classes also being verified. The extra overhead is acceptable during
1292 // dumping.
1293 BytecodeVerificationLocal = BytecodeVerificationRemote;
1294 }
1295 ik->link_class(THREAD);
1296 if (HAS_PENDING_EXCEPTION) {
1297 ResourceMark rm(THREAD);
1298 aot_log_warning(aot)("Preload Warning: Verification failed for %s",
1299 ik->external_name());
1300 CLEAR_PENDING_EXCEPTION;
1301 SystemDictionaryShared::set_class_has_failed_verification(ik);
1302 } else {
1303 assert(!SystemDictionaryShared::has_class_failed_verification(ik), "sanity");
1304 ik->compute_has_loops_flag_for_methods();
1305 }
1306 BytecodeVerificationLocal = saved;
1307 return true;
1308 } else {
1309 return false;
1310 }
1311 }
1312
1313 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
1314 if (CDSConfig::is_dumping_heap()) {
1315 HeapShared::write_heap(&_heap_info);
1316 } else if (!CDSConfig::is_dumping_preimage_static_archive()) {
1317 CDSConfig::log_reasons_for_not_dumping_heap();
1318 }
1319 }
1320
1321 void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
1322 assert(base <= static_top && static_top <= top, "must be");
1323 _shared_metaspace_static_top = static_top;
1324 MetaspaceObj::set_shared_metaspace_range(base, top);
1325 }
1326
1327 bool MetaspaceShared::is_shared_dynamic(void* p) {
1328 if ((p < MetaspaceObj::shared_metaspace_top()) &&
1329 (p >= _shared_metaspace_static_top)) {
1330 return true;
1331 } else {
1332 return false;
1333 }
1334 }
1335
1336 bool MetaspaceShared::is_shared_static(void* p) {
1337 if (is_in_shared_metaspace(p) && !is_shared_dynamic(p)) {
1338 return true;
1339 } else {
1340 return false;
1341 }
1342 }
1343
1344 // This function is called when the JVM is unable to load the specified archive(s) due to one
1345 // of the following conditions.
1346 // - There's an error that indicates that the archive(s) files were corrupt or otherwise damaged.
1347 // - When -XX:+RequireSharedSpaces is specified, AND the JVM cannot load the archive(s) due
1348 // to version or classpath mismatch.
1349 void MetaspaceShared::unrecoverable_loading_error(const char* message) {
1350 report_loading_error("%s", message);
1351
1352 if (CDSConfig::is_dumping_final_static_archive()) {
1353 vm_exit_during_initialization("Must be a valid AOT configuration generated by the current JVM", AOTConfiguration);
1354 } else if (CDSConfig::new_aot_flags_used()) {
1355 vm_exit_during_initialization("Unable to use AOT cache.", nullptr);
1356 } else {
1357 vm_exit_during_initialization("Unable to use shared archive.", nullptr);
1358 }
1359 }
1360
1361 void MetaspaceShared::report_loading_error(const char* format, ...) {
1362 // When using AOT cache, errors messages are always printed on the error channel.
1363 LogStream ls_aot(LogLevel::Error, LogTagSetMapping<LOG_TAGS(aot)>::tagset());
1364
1365 // If we are loading load the default CDS archive, it may fail due to incompatible VM options.
1366 // Print at the info level to avoid excessive verbosity.
1367 // However, if the user has specified a CDS archive (or AOT cache), they would be interested in
1368 // knowing that the loading fails, so we print at the error level.
1369 LogLevelType level = (!CDSConfig::is_using_archive() || CDSConfig::is_using_only_default_archive()) ?
1370 LogLevel::Info : LogLevel::Error;
1371 LogStream ls_cds(level, LogTagSetMapping<LOG_TAGS(cds)>::tagset());
1372
1373 LogStream& ls = CDSConfig::new_aot_flags_used() ? ls_aot : ls_cds;
1374 if (!ls.is_enabled()) {
1375 return;
1376 }
1377
1378 va_list ap;
1379 va_start(ap, format);
1380
1381 static bool printed_error = false;
1382 if (!printed_error) { // No need for locks. Loading error checks happen only in main thread.
1383 ls.print_cr("An error has occurred while processing the %s. Run with -Xlog:%s for details.",
1384 CDSConfig::type_of_archive_being_loaded(), CDSConfig::new_aot_flags_used() ? "aot" : "aot,cds");
1385 printed_error = true;
1386 }
1387 ls.vprint_cr(format, ap);
1388
1389 va_end(ap);
1390 }
1391
1392 // This function is called when the JVM is unable to write the specified CDS archive due to an
1393 // unrecoverable error.
1394 void MetaspaceShared::unrecoverable_writing_error(const char* message) {
1395 writing_error(message);
1396 vm_direct_exit(1);
1397 }
1398
1399 // This function is called when the JVM is unable to write the specified CDS archive due to a
1400 // an error. The error will be propagated
1401 void MetaspaceShared::writing_error(const char* message) {
1402 aot_log_error(aot)("An error has occurred while writing the shared archive file.");
1403 if (message != nullptr) {
1404 aot_log_error(aot)("%s", message);
1405 }
1406 }
1407
1408 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
1409 assert(CDSConfig::is_using_archive(), "Must be called when UseSharedSpaces is enabled");
1410 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1411
1412 FileMapInfo* static_mapinfo = FileMapInfo::current_info();
1413 FileMapInfo* dynamic_mapinfo = nullptr;
1414
1415 if (static_mapinfo != nullptr) {
1416 aot_log_info(aot)("Core region alignment: %zu", static_mapinfo->core_region_alignment());
1417 dynamic_mapinfo = open_dynamic_archive();
1418
1419 aot_log_info(aot)("ArchiveRelocationMode: %d", ArchiveRelocationMode);
1420
1421 // First try to map at the requested address
1422 result = map_archives(static_mapinfo, dynamic_mapinfo, true);
1423 if (result == MAP_ARCHIVE_MMAP_FAILURE) {
1424 // Mapping has failed (probably due to ASLR). Let's map at an address chosen
1425 // by the OS.
1426 aot_log_info(aot)("Try to map archive(s) at an alternative address");
1427 result = map_archives(static_mapinfo, dynamic_mapinfo, false);
1428 }
1429 }
1430
1431 if (result == MAP_ARCHIVE_SUCCESS) {
1432 bool dynamic_mapped = (dynamic_mapinfo != nullptr && dynamic_mapinfo->is_mapped());
1433 char* cds_base = static_mapinfo->mapped_base();
1434 char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
1435 // Register CDS memory region with LSan.
1436 LSAN_REGISTER_ROOT_REGION(cds_base, cds_end - cds_base);
1437 set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
1438 _relocation_delta = static_mapinfo->relocation_delta();
1439 _requested_base_address = static_mapinfo->requested_base_address();
1440 if (dynamic_mapped) {
1441 // turn AutoCreateSharedArchive off if successfully mapped
1442 AutoCreateSharedArchive = false;
1443 }
1444 } else {
1445 set_shared_metaspace_range(nullptr, nullptr, nullptr);
1446 if (CDSConfig::is_dumping_dynamic_archive()) {
1447 aot_log_warning(aot)("-XX:ArchiveClassesAtExit is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
1448 }
1449 UseSharedSpaces = false;
1450 // The base archive cannot be mapped. We cannot dump the dynamic shared archive.
1451 AutoCreateSharedArchive = false;
1452 CDSConfig::disable_dumping_dynamic_archive();
1453 if (PrintSharedArchiveAndExit) {
1454 MetaspaceShared::unrecoverable_loading_error("Unable to use shared archive.");
1455 } else {
1456 if (RequireSharedSpaces) {
1457 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1458 } else {
1459 report_loading_error("Unable to map shared spaces");
1460 }
1461 }
1462 }
1463
1464 // If mapping failed and -XShare:on, the vm should exit
1465 bool has_failed = false;
1466 if (static_mapinfo != nullptr && !static_mapinfo->is_mapped()) {
1467 has_failed = true;
1468 delete static_mapinfo;
1469 }
1470 if (dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped()) {
1471 has_failed = true;
1472 delete dynamic_mapinfo;
1473 }
1474 if (RequireSharedSpaces && has_failed) {
1475 // static archive mapped but dynamic archive failed
1476 MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1477 }
1478 }
1479
1480 // This is called very early at VM start up to get the size of the cached_code region
1481 void MetaspaceShared::open_static_archive() {
1482 if (!UseSharedSpaces) { // FIXME -- is this still needed??
1483 return;
1484 }
1485 const char* static_archive = CDSConfig::input_static_archive_path();
1486 assert(static_archive != nullptr, "sanity");
1487 FileMapInfo* mapinfo = new FileMapInfo(static_archive, true);
1488 if (!mapinfo->open_as_input()) {
1489 delete(mapinfo);
1490 } else {
1491 FileMapRegion* r = mapinfo->region_at(MetaspaceShared::ac);
1492 AOTCacheAccess::set_aot_code_region_size(r->used_aligned());
1493 }
1494 }
1495
1496 FileMapInfo* MetaspaceShared::open_dynamic_archive() {
1497 if (CDSConfig::is_dumping_dynamic_archive()) {
1498 return nullptr;
1499 }
1500 const char* dynamic_archive = CDSConfig::input_dynamic_archive_path();
1501 if (dynamic_archive == nullptr) {
1502 return nullptr;
1503 }
1504
1505 FileMapInfo* mapinfo = new FileMapInfo(dynamic_archive, false);
1506 if (!mapinfo->open_as_input()) {
1507 delete(mapinfo);
1508 if (RequireSharedSpaces) {
1509 MetaspaceShared::unrecoverable_loading_error("Failed to initialize dynamic archive");
1510 }
1511 return nullptr;
1512 }
1513 return mapinfo;
1514 }
1515
1516 // use_requested_addr:
1517 // true = map at FileMapHeader::_requested_base_address
1518 // false = map at an alternative address picked by OS.
1519 MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
1520 bool use_requested_addr) {
1521 if (use_requested_addr && static_mapinfo->requested_base_address() == nullptr) {
1522 aot_log_info(aot)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
1523 return MAP_ARCHIVE_MMAP_FAILURE;
1524 }
1525
1526 PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1527 // For product build only -- this is for benchmarking the cost of doing relocation.
1528 // For debug builds, the check is done below, after reserving the space, for better test coverage
1529 // (see comment below).
1530 aot_log_info(aot)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1531 return MAP_ARCHIVE_MMAP_FAILURE;
1532 });
1533
1534 if (ArchiveRelocationMode == 2 && !use_requested_addr) {
1535 aot_log_info(aot)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
1536 return MAP_ARCHIVE_MMAP_FAILURE;
1537 };
1538
1539 if (dynamic_mapinfo != nullptr) {
1540 // Ensure that the OS won't be able to allocate new memory spaces between the two
1541 // archives, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1542 assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
1543 }
1544
1545 ReservedSpace total_space_rs, archive_space_rs, class_space_rs;
1546 MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1547 size_t prot_zone_size = 0;
1548 char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo,
1549 dynamic_mapinfo,
1550 use_requested_addr,
1551 total_space_rs,
1552 archive_space_rs,
1553 class_space_rs);
1554 if (mapped_base_address == nullptr) {
1555 result = MAP_ARCHIVE_MMAP_FAILURE;
1556 aot_log_debug(aot)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
1557 } else {
1558
1559 if (Metaspace::using_class_space()) {
1560 prot_zone_size = protection_zone_size();
1561 }
1562
1563 #ifdef ASSERT
1564 // Some sanity checks after reserving address spaces for archives
1565 // and class space.
1566 assert(archive_space_rs.is_reserved(), "Sanity");
1567 if (Metaspace::using_class_space()) {
1568 assert(archive_space_rs.base() == mapped_base_address &&
1569 archive_space_rs.size() > protection_zone_size(),
1570 "Archive space must lead and include the protection zone");
1571 // Class space must closely follow the archive space. Both spaces
1572 // must be aligned correctly.
1573 assert(class_space_rs.is_reserved() && class_space_rs.size() > 0,
1574 "A class space should have been reserved");
1575 assert(class_space_rs.base() >= archive_space_rs.end(),
1576 "class space should follow the cds archive space");
1577 assert(is_aligned(archive_space_rs.base(),
1578 core_region_alignment()),
1579 "Archive space misaligned");
1580 assert(is_aligned(class_space_rs.base(),
1581 Metaspace::reserve_alignment()),
1582 "class space misaligned");
1583 }
1584 #endif // ASSERT
1585
1586 aot_log_info(aot)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (%zu) bytes%s",
1587 p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size(),
1588 (prot_zone_size > 0 ? " (includes protection zone)" : ""));
1589 aot_log_info(aot)("Reserved class_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (%zu) bytes",
1590 p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
1591
1592 if (MetaspaceShared::use_windows_memory_mapping()) {
1593 // We have now reserved address space for the archives, and will map in
1594 // the archive files into this space.
1595 //
1596 // Special handling for Windows: on Windows we cannot map a file view
1597 // into an existing memory mapping. So, we unmap the address range we
1598 // just reserved again, which will make it available for mapping the
1599 // archives.
1600 // Reserving this range has not been for naught however since it makes
1601 // us reasonably sure the address range is available.
1602 //
1603 // But still it may fail, since between unmapping the range and mapping
1604 // in the archive someone else may grab the address space. Therefore
1605 // there is a fallback in FileMap::map_region() where we just read in
1606 // the archive files sequentially instead of mapping it in. We couple
1607 // this with use_requested_addr, since we're going to patch all the
1608 // pointers anyway so there's no benefit to mmap.
1609 if (use_requested_addr) {
1610 assert(!total_space_rs.is_reserved(), "Should not be reserved for Windows");
1611 aot_log_info(aot)("Windows mmap workaround: releasing archive space.");
1612 MemoryReserver::release(archive_space_rs);
1613 // Mark as not reserved
1614 archive_space_rs = {};
1615 // The protection zone is part of the archive:
1616 // See comment above, the Windows way of loading CDS is to mmap the individual
1617 // parts of the archive into the address region we just vacated. The protection
1618 // zone will not be mapped (and, in fact, does not exist as physical region in
1619 // the archive). Therefore, after removing the archive space above, we must
1620 // re-reserve the protection zone part lest something else gets mapped into that
1621 // area later.
1622 if (prot_zone_size > 0) {
1623 assert(prot_zone_size >= os::vm_allocation_granularity(), "must be"); // not just page size!
1624 char* p = os::attempt_reserve_memory_at(mapped_base_address, prot_zone_size,
1625 mtClassShared);
1626 assert(p == mapped_base_address || p == nullptr, "must be");
1627 if (p == nullptr) {
1628 aot_log_debug(aot)("Failed to re-reserve protection zone");
1629 return MAP_ARCHIVE_MMAP_FAILURE;
1630 }
1631 }
1632 }
1633 }
1634
1635 if (prot_zone_size > 0) {
1636 os::commit_memory(mapped_base_address, prot_zone_size, false); // will later be protected
1637 // Before mapping the core regions into the newly established address space, we mark
1638 // start and the end of the future protection zone with canaries. That way we easily
1639 // catch mapping errors (accidentally mapping data into the future protection zone).
1640 *(mapped_base_address) = 'P';
1641 *(mapped_base_address + prot_zone_size - 1) = 'P';
1642 }
1643
1644 MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
1645 MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
1646 map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
1647
1648 DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1649 // This is for simulating mmap failures at the requested address. In
1650 // debug builds, we do it here (after all archives have possibly been
1651 // mapped), so we can thoroughly test the code for failure handling
1652 // (releasing all allocated resource, etc).
1653 aot_log_info(aot)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1654 if (static_result == MAP_ARCHIVE_SUCCESS) {
1655 static_result = MAP_ARCHIVE_MMAP_FAILURE;
1656 }
1657 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1658 dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
1659 }
1660 });
1661
1662 if (static_result == MAP_ARCHIVE_SUCCESS) {
1663 if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1664 result = MAP_ARCHIVE_SUCCESS;
1665 } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
1666 assert(dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped(), "must have failed");
1667 // No need to retry mapping the dynamic archive again, as it will never succeed
1668 // (bad file, etc) -- just keep the base archive.
1669 log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
1670 dynamic_mapinfo->full_path());
1671 result = MAP_ARCHIVE_SUCCESS;
1672 // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
1673 // easy API to do that right now.
1674 } else {
1675 result = MAP_ARCHIVE_MMAP_FAILURE;
1676 }
1677 } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
1678 result = MAP_ARCHIVE_OTHER_FAILURE;
1679 } else {
1680 result = MAP_ARCHIVE_MMAP_FAILURE;
1681 }
1682 }
1683
1684 if (result == MAP_ARCHIVE_SUCCESS) {
1685 SharedBaseAddress = (size_t)mapped_base_address;
1686 #ifdef _LP64
1687 if (Metaspace::using_class_space()) {
1688 assert(prot_zone_size > 0 &&
1689 *(mapped_base_address) == 'P' &&
1690 *(mapped_base_address + prot_zone_size - 1) == 'P',
1691 "Protection zone was overwritten?");
1692 // Set up ccs in metaspace.
1693 Metaspace::initialize_class_space(class_space_rs);
1694
1695 // Set up compressed Klass pointer encoding: the encoding range must
1696 // cover both archive and class space.
1697 const address encoding_base = (address)mapped_base_address;
1698 const address klass_range_start = encoding_base + prot_zone_size;
1699 const size_t klass_range_size = (address)class_space_rs.end() - klass_range_start;
1700 if (INCLUDE_CDS_JAVA_HEAP || UseCompactObjectHeaders) {
1701 // The CDS archive may contain narrow Klass IDs that were precomputed at archive generation time:
1702 // - every archived java object header (only if INCLUDE_CDS_JAVA_HEAP)
1703 // - every archived Klass' prototype (only if +UseCompactObjectHeaders)
1704 //
1705 // In order for those IDs to still be valid, we need to dictate base and shift: base should be the
1706 // mapping start (including protection zone), shift should be the shift used at archive generation time.
1707 CompressedKlassPointers::initialize_for_given_encoding(
1708 klass_range_start, klass_range_size,
1709 encoding_base, ArchiveBuilder::precomputed_narrow_klass_shift() // precomputed encoding, see ArchiveBuilder
1710 );
1711 } else {
1712 // Let JVM freely choose encoding base and shift
1713 CompressedKlassPointers::initialize(klass_range_start, klass_range_size);
1714 }
1715 CompressedKlassPointers::establish_protection_zone(encoding_base, prot_zone_size);
1716
1717 // map_or_load_heap_region() compares the current narrow oop and klass encodings
1718 // with the archived ones, so it must be done after all encodings are determined.
1719 static_mapinfo->map_or_load_heap_region();
1720 }
1721 #endif // _LP64
1722 log_info(aot)("initial optimized module handling: %s", CDSConfig::is_using_optimized_module_handling() ? "enabled" : "disabled");
1723 log_info(aot)("initial full module graph: %s", CDSConfig::is_using_full_module_graph() ? "enabled" : "disabled");
1724 } else {
1725 unmap_archive(static_mapinfo);
1726 unmap_archive(dynamic_mapinfo);
1727 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1728 }
1729
1730 return result;
1731 }
1732
1733
1734 // This will reserve two address spaces suitable to house Klass structures, one
1735 // for the cds archives (static archive and optionally dynamic archive) and
1736 // optionally one move for ccs.
1737 //
1738 // Since both spaces must fall within the compressed class pointer encoding
1739 // range, they are allocated close to each other.
1740 //
1741 // Space for archives will be reserved first, followed by a potential gap,
1742 // followed by the space for ccs:
1743 //
1744 // +-- Base address A B End
1745 // | | | |
1746 // v v v v
1747 // +-------------+--------------+ +----------------------+
1748 // | static arc | [dyn. arch] | [gap] | compr. class space |
1749 // +-------------+--------------+ +----------------------+
1750 //
1751 // (The gap may result from different alignment requirements between metaspace
1752 // and CDS)
1753 //
1754 // If UseCompressedClassPointers is disabled, only one address space will be
1755 // reserved:
1756 //
1757 // +-- Base address End
1758 // | |
1759 // v v
1760 // +-------------+--------------+
1761 // | static arc | [dyn. arch] |
1762 // +-------------+--------------+
1763 //
1764 // Base address: If use_archive_base_addr address is true, the Base address is
1765 // determined by the address stored in the static archive. If
1766 // use_archive_base_addr address is false, this base address is determined
1767 // by the platform.
1768 //
1769 // If UseCompressedClassPointers=1, the range encompassing both spaces will be
1770 // suitable to en/decode narrow Klass pointers: the base will be valid for
1771 // encoding, the range [Base, End) and not surpass the max. range for that encoding.
1772 //
1773 // Return:
1774 //
1775 // - On success:
1776 // - total_space_rs will be reserved as whole for archive_space_rs and
1777 // class_space_rs if UseCompressedClassPointers is true.
1778 // On Windows, try reserve archive_space_rs and class_space_rs
1779 // separately first if use_archive_base_addr is true.
1780 // - archive_space_rs will be reserved and large enough to host static and
1781 // if needed dynamic archive: [Base, A).
1782 // archive_space_rs.base and size will be aligned to CDS reserve
1783 // granularity.
1784 // - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
1785 // be reserved. Its start address will be aligned to metaspace reserve
1786 // alignment, which may differ from CDS alignment. It will follow the cds
1787 // archive space, close enough such that narrow class pointer encoding
1788 // covers both spaces.
1789 // If UseCompressedClassPointers=0, class_space_rs remains unreserved.
1790 // - On error: null is returned and the spaces remain unreserved.
1791 char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
1792 FileMapInfo* dynamic_mapinfo,
1793 bool use_archive_base_addr,
1794 ReservedSpace& total_space_rs,
1795 ReservedSpace& archive_space_rs,
1796 ReservedSpace& class_space_rs) {
1797
1798 address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : nullptr);
1799 const size_t archive_space_alignment = core_region_alignment();
1800
1801 // Size and requested location of the archive_space_rs (for both static and dynamic archives)
1802 size_t archive_end_offset = (dynamic_mapinfo == nullptr) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
1803 size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
1804
1805 if (!Metaspace::using_class_space()) {
1806 // Get the simple case out of the way first:
1807 // no compressed class space, simple allocation.
1808
1809 // When running without class space, requested archive base should be aligned to cds core alignment.
1810 assert(is_aligned(base_address, archive_space_alignment),
1811 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1812 p2i(base_address), archive_space_alignment);
1813
1814 archive_space_rs = MemoryReserver::reserve((char*)base_address,
1815 archive_space_size,
1816 archive_space_alignment,
1817 os::vm_page_size(),
1818 mtNone);
1819 if (archive_space_rs.is_reserved()) {
1820 assert(base_address == nullptr ||
1821 (address)archive_space_rs.base() == base_address, "Sanity");
1822 // Register archive space with NMT.
1823 MemTracker::record_virtual_memory_tag(archive_space_rs, mtClassShared);
1824 return archive_space_rs.base();
1825 }
1826 return nullptr;
1827 }
1828
1829 #ifdef _LP64
1830
1831 // Complex case: two spaces adjacent to each other, both to be addressable
1832 // with narrow class pointers.
1833 // We reserve the whole range spanning both spaces, then split that range up.
1834
1835 const size_t class_space_alignment = Metaspace::reserve_alignment();
1836
1837 // When running with class space, requested archive base must satisfy both cds core alignment
1838 // and class space alignment.
1839 const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1840 assert(is_aligned(base_address, base_address_alignment),
1841 "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1842 p2i(base_address), base_address_alignment);
1843
1844 size_t class_space_size = CompressedClassSpaceSize;
1845 assert(CompressedClassSpaceSize > 0 &&
1846 is_aligned(CompressedClassSpaceSize, class_space_alignment),
1847 "CompressedClassSpaceSize malformed: %zu", CompressedClassSpaceSize);
1848
1849 const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1850 const size_t gap_size = ccs_begin_offset - archive_space_size;
1851
1852 // Reduce class space size if it would not fit into the Klass encoding range
1853 constexpr size_t max_encoding_range_size = 4 * G;
1854 guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1855 if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1856 class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1857 log_info(metaspace)("CDS initialization: reducing class space size from %zu to %zu",
1858 CompressedClassSpaceSize, class_space_size);
1859 FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1860 }
1861
1862 const size_t total_range_size =
1863 archive_space_size + gap_size + class_space_size;
1864
1865 // Test that class space base address plus shift can be decoded by aarch64, when restored.
1866 const int precomputed_narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1867 if (!CompressedKlassPointers::check_klass_decode_mode(base_address, precomputed_narrow_klass_shift,
1868 total_range_size)) {
1869 aot_log_info(aot)("CDS initialization: Cannot use SharedBaseAddress " PTR_FORMAT " with precomputed shift %d.",
1870 p2i(base_address), precomputed_narrow_klass_shift);
1871 use_archive_base_addr = false;
1872 }
1873
1874 assert(total_range_size > ccs_begin_offset, "must be");
1875 if (use_windows_memory_mapping() && use_archive_base_addr) {
1876 if (base_address != nullptr) {
1877 // On Windows, we cannot safely split a reserved memory space into two (see JDK-8255917).
1878 // Hence, we optimistically reserve archive space and class space side-by-side. We only
1879 // do this for use_archive_base_addr=true since for use_archive_base_addr=false case
1880 // caller will not split the combined space for mapping, instead read the archive data
1881 // via sequential file IO.
1882 address ccs_base = base_address + archive_space_size + gap_size;
1883 archive_space_rs = MemoryReserver::reserve((char*)base_address,
1884 archive_space_size,
1885 archive_space_alignment,
1886 os::vm_page_size(),
1887 mtNone);
1888 class_space_rs = MemoryReserver::reserve((char*)ccs_base,
1889 class_space_size,
1890 class_space_alignment,
1891 os::vm_page_size(),
1892 mtNone);
1893 }
1894 if (!archive_space_rs.is_reserved() || !class_space_rs.is_reserved()) {
1895 release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1896 return nullptr;
1897 }
1898 MemTracker::record_virtual_memory_tag(archive_space_rs, mtClassShared);
1899 MemTracker::record_virtual_memory_tag(class_space_rs, mtClass);
1900 } else {
1901 if (use_archive_base_addr && base_address != nullptr) {
1902 total_space_rs = MemoryReserver::reserve((char*) base_address,
1903 total_range_size,
1904 base_address_alignment,
1905 os::vm_page_size(),
1906 mtNone);
1907 } else {
1908 // We did not manage to reserve at the preferred address, or were instructed to relocate. In that
1909 // case we reserve wherever possible, but the start address needs to be encodable as narrow Klass
1910 // encoding base since the archived heap objects contain narrow Klass IDs pre-calculated toward the start
1911 // of the shared Metaspace. That prevents us from using zero-based encoding and therefore we won't
1912 // try allocating in low-address regions.
1913 total_space_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size, false /* optimize_for_zero_base */);
1914 }
1915
1916 if (!total_space_rs.is_reserved()) {
1917 return nullptr;
1918 }
1919
1920 // Paranoid checks:
1921 assert(!use_archive_base_addr || (address)total_space_rs.base() == base_address,
1922 "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_space_rs.base()));
1923 assert(is_aligned(total_space_rs.base(), base_address_alignment), "Sanity");
1924 assert(total_space_rs.size() == total_range_size, "Sanity");
1925
1926 // Now split up the space into ccs and cds archive. For simplicity, just leave
1927 // the gap reserved at the end of the archive space. Do not do real splitting.
1928 archive_space_rs = total_space_rs.first_part(ccs_begin_offset,
1929 (size_t)archive_space_alignment);
1930 class_space_rs = total_space_rs.last_part(ccs_begin_offset);
1931 MemTracker::record_virtual_memory_split_reserved(total_space_rs.base(), total_space_rs.size(),
1932 ccs_begin_offset, mtClassShared, mtClass);
1933 }
1934 assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
1935 assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
1936 assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
1937 assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
1938
1939
1940 return archive_space_rs.base();
1941
1942 #else
1943 ShouldNotReachHere();
1944 return nullptr;
1945 #endif
1946
1947 }
1948
1949 void MetaspaceShared::release_reserved_spaces(ReservedSpace& total_space_rs,
1950 ReservedSpace& archive_space_rs,
1951 ReservedSpace& class_space_rs) {
1952 if (total_space_rs.is_reserved()) {
1953 aot_log_debug(aot)("Released shared space (archive + class) " INTPTR_FORMAT, p2i(total_space_rs.base()));
1954 MemoryReserver::release(total_space_rs);
1955 total_space_rs = {};
1956 } else {
1957 if (archive_space_rs.is_reserved()) {
1958 aot_log_debug(aot)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
1959 MemoryReserver::release(archive_space_rs);
1960 archive_space_rs = {};
1961 }
1962 if (class_space_rs.is_reserved()) {
1963 aot_log_debug(aot)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
1964 MemoryReserver::release(class_space_rs);
1965 class_space_rs = {};
1966 }
1967 }
1968 }
1969
1970 static int archive_regions[] = { MetaspaceShared::rw, MetaspaceShared::ro };
1971 static int archive_regions_count = 2;
1972
1973 MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
1974 assert(CDSConfig::is_using_archive(), "must be runtime");
1975 if (mapinfo == nullptr) {
1976 return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
1977 }
1978
1979 if (!mapinfo->validate_aot_class_linking()) {
1980 return MAP_ARCHIVE_OTHER_FAILURE;
1981 }
1982
1983 mapinfo->set_is_mapped(false);
1984 if (mapinfo->core_region_alignment() != (size_t)core_region_alignment()) {
1985 report_loading_error("Unable to map CDS archive -- core_region_alignment() expected: %zu"
1986 " actual: %zu", mapinfo->core_region_alignment(), core_region_alignment());
1987 return MAP_ARCHIVE_OTHER_FAILURE;
1988 }
1989
1990 MapArchiveResult result =
1991 mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
1992
1993 if (result != MAP_ARCHIVE_SUCCESS) {
1994 unmap_archive(mapinfo);
1995 return result;
1996 }
1997
1998 if (!mapinfo->validate_class_location()) {
1999 unmap_archive(mapinfo);
2000 return MAP_ARCHIVE_OTHER_FAILURE;
2001 }
2002
2003 if (mapinfo->is_static()) {
2004 // Currently, only static archive uses early serialized data.
2005 char* buffer = mapinfo->early_serialized_data();
2006 intptr_t* array = (intptr_t*)buffer;
2007 ReadClosure rc(&array, (intptr_t)mapped_base_address);
2008 early_serialize(&rc);
2009 }
2010
2011 if (!mapinfo->validate_aot_class_linking()) {
2012 unmap_archive(mapinfo);
2013 return MAP_ARCHIVE_OTHER_FAILURE;
2014 }
2015
2016 mapinfo->set_is_mapped(true);
2017 return MAP_ARCHIVE_SUCCESS;
2018 }
2019
2020 void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
2021 assert(CDSConfig::is_using_archive(), "must be runtime");
2022 if (mapinfo != nullptr) {
2023 mapinfo->unmap_regions(archive_regions, archive_regions_count);
2024 mapinfo->unmap_region(MetaspaceShared::bm);
2025 mapinfo->set_is_mapped(false);
2026 }
2027 }
2028
2029 // For -XX:PrintSharedArchiveAndExit
2030 class CountSharedSymbols : public SymbolClosure {
2031 private:
2032 int _count;
2033 public:
2034 CountSharedSymbols() : _count(0) {}
2035 void do_symbol(Symbol** sym) {
2036 _count++;
2037 }
2038 int total() { return _count; }
2039
2040 };
2041
2042 // Read the miscellaneous data from the shared file, and
2043 // serialize it out to its various destinations.
2044
2045 void MetaspaceShared::initialize_shared_spaces() {
2046 FileMapInfo *static_mapinfo = FileMapInfo::current_info();
2047
2048 // Verify various attributes of the archive, plus initialize the
2049 // shared string/symbol tables.
2050 char* buffer = static_mapinfo->serialized_data();
2051 intptr_t* array = (intptr_t*)buffer;
2052 ReadClosure rc(&array, (intptr_t)SharedBaseAddress);
2053 serialize(&rc);
2054
2055 // Finish up archived heap initialization. These must be
2056 // done after ReadClosure.
2057 static_mapinfo->patch_heap_embedded_pointers();
2058 ArchiveHeapLoader::finish_initialization();
2059 Universe::load_archived_object_instances();
2060 AOTCodeCache::initialize();
2061
2062 // Close the mapinfo file
2063 static_mapinfo->close();
2064
2065 static_mapinfo->unmap_region(MetaspaceShared::bm);
2066
2067 FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
2068 if (dynamic_mapinfo != nullptr) {
2069 intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
2070 ReadClosure rc(&buffer, (intptr_t)SharedBaseAddress);
2071 ArchiveBuilder::serialize_dynamic_archivable_items(&rc);
2072 DynamicArchive::setup_array_klasses();
2073 dynamic_mapinfo->close();
2074 dynamic_mapinfo->unmap_region(MetaspaceShared::bm);
2075 }
2076
2077 LogStreamHandle(Info, aot) lsh;
2078 if (lsh.is_enabled()) {
2079 lsh.print("Using AOT-linked classes: %s (static archive: %s aot-linked classes",
2080 BOOL_TO_STR(CDSConfig::is_using_aot_linked_classes()),
2081 static_mapinfo->header()->has_aot_linked_classes() ? "has" : "no");
2082 if (dynamic_mapinfo != nullptr) {
2083 lsh.print(", dynamic archive: %s aot-linked classes",
2084 dynamic_mapinfo->header()->has_aot_linked_classes() ? "has" : "no");
2085 }
2086 lsh.print_cr(")");
2087 }
2088
2089 // Set up LambdaFormInvokers::_lambdaform_lines for dynamic dump
2090 if (CDSConfig::is_dumping_dynamic_archive()) {
2091 // Read stored LF format lines stored in static archive
2092 LambdaFormInvokers::read_static_archive_invokers();
2093 }
2094
2095 if (PrintSharedArchiveAndExit) {
2096 // Print archive names
2097 if (dynamic_mapinfo != nullptr) {
2098 tty->print_cr("\n\nBase archive name: %s", CDSConfig::input_static_archive_path());
2099 tty->print_cr("Base archive version %d", static_mapinfo->version());
2100 } else {
2101 tty->print_cr("Static archive name: %s", static_mapinfo->full_path());
2102 tty->print_cr("Static archive version %d", static_mapinfo->version());
2103 }
2104
2105 SystemDictionaryShared::print_shared_archive(tty);
2106 if (dynamic_mapinfo != nullptr) {
2107 tty->print_cr("\n\nDynamic archive name: %s", dynamic_mapinfo->full_path());
2108 tty->print_cr("Dynamic archive version %d", dynamic_mapinfo->version());
2109 SystemDictionaryShared::print_shared_archive(tty, false/*dynamic*/);
2110 }
2111
2112 TrainingData::print_archived_training_data_on(tty);
2113
2114 AOTCodeCache::print_on(tty);
2115
2116 // collect shared symbols and strings
2117 CountSharedSymbols cl;
2118 SymbolTable::shared_symbols_do(&cl);
2119 tty->print_cr("Number of shared symbols: %d", cl.total());
2120 tty->print_cr("Number of shared strings: %zu", StringTable::shared_entry_count());
2121 tty->print_cr("VM version: %s\r\n", static_mapinfo->vm_version());
2122 if (FileMapInfo::current_info() == nullptr || _archive_loading_failed) {
2123 tty->print_cr("archive is invalid");
2124 vm_exit(1);
2125 } else {
2126 tty->print_cr("archive is valid");
2127 vm_exit(0);
2128 }
2129 }
2130 }
2131
2132 // JVM/TI RedefineClasses() support:
2133 bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
2134 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
2135
2136 if (CDSConfig::is_using_archive()) {
2137 // remap the shared readonly space to shared readwrite, private
2138 FileMapInfo* mapinfo = FileMapInfo::current_info();
2139 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2140 return false;
2141 }
2142 if (FileMapInfo::dynamic_info() != nullptr) {
2143 mapinfo = FileMapInfo::dynamic_info();
2144 if (!mapinfo->remap_shared_readonly_as_readwrite()) {
2145 return false;
2146 }
2147 }
2148 _remapped_readwrite = true;
2149 }
2150 return true;
2151 }
2152
2153 void MetaspaceShared::print_on(outputStream* st) {
2154 if (CDSConfig::is_using_archive()) {
2155 st->print("CDS archive(s) mapped at: ");
2156 address base = (address)MetaspaceObj::shared_metaspace_base();
2157 address static_top = (address)_shared_metaspace_static_top;
2158 address top = (address)MetaspaceObj::shared_metaspace_top();
2159 st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
2160 st->print("size %zu, ", top - base);
2161 st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, ArchiveRelocationMode);
2162 } else {
2163 st->print("CDS archive(s) not mapped");
2164 }
2165 st->cr();
2166 }