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