1 /* 2 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classListParser.hpp" 27 #include "classfile/classLoaderExt.hpp" 28 #include "classfile/dictionary.hpp" 29 #include "classfile/loaderConstraints.hpp" 30 #include "classfile/placeholders.hpp" 31 #include "classfile/sharedClassUtil.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/systemDictionaryShared.hpp" 36 #include "code/codeCache.hpp" 37 #include "gc/shared/gcLocker.hpp" 38 #include "interpreter/bytecodeStream.hpp" 39 #include "interpreter/bytecodes.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logMessage.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/metaspace.hpp" 44 #include "memory/metaspaceShared.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "oops/instanceClassLoaderKlass.hpp" 47 #include "oops/instanceMirrorKlass.hpp" 48 #include "oops/instanceRefKlass.hpp" 49 #include "oops/objArrayKlass.hpp" 50 #include "oops/objArrayOop.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "oops/typeArrayKlass.hpp" 53 #include "prims/jvm.h" 54 #include "prims/jvmtiRedefineClasses.hpp" 55 #include "runtime/timerTrace.hpp" 56 #include "runtime/os.hpp" 57 #include "runtime/signature.hpp" 58 #include "runtime/vmThread.hpp" 59 #include "runtime/vm_operations.hpp" 60 #include "utilities/align.hpp" 61 #include "utilities/defaultStream.hpp" 62 #include "utilities/hashtable.inline.hpp" 63 #include "memory/metaspaceClosure.hpp" 64 65 ReservedSpace MetaspaceShared::_shared_rs; 66 VirtualSpace MetaspaceShared::_shared_vs; 67 MetaspaceSharedStats MetaspaceShared::_stats; 68 bool MetaspaceShared::_has_error_classes; 69 bool MetaspaceShared::_archive_loading_failed = false; 70 bool MetaspaceShared::_remapped_readwrite = false; 71 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL; 72 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0; 73 size_t MetaspaceShared::_core_spaces_size = 0; 74 75 // The CDS archive is divided into the following regions: 76 // mc - misc code (the method entry trampolines) 77 // rw - read-write metadata 78 // ro - read-only metadata and read-only tables 79 // md - misc data (the c++ vtables) 80 // od - optional data (original class files) 81 // 82 // s0 - shared strings #0 83 // s1 - shared strings #1 (may be empty) 84 // 85 // Except for the s0/s1 regions, the other 5 regions are linearly allocated, starting from 86 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions 87 // are page-aligned, and there's no gap between any consecutive regions. 88 // 89 // These 5 regions are populated in the following steps: 90 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are 91 // temporarily allocated outside of the shared regions. Only the method entry 92 // trampolines are written into the mc region. 93 // [2] ArchiveCompactor copies RW metadata into the rw region. 94 // [3] ArchiveCompactor copies RO metadata into the ro region. 95 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data 96 // are copied into the ro region as read-only tables. 97 // [5] C++ vtables are copied into the md region. 98 // [6] Original class files are copied into the od region. 99 // 100 // The s0/s1 regions are populated inside MetaspaceShared::dump_string_and_symbols. Their 101 // layout is independent of the other 5 regions. 102 103 class DumpRegion { 104 private: 105 const char* _name; 106 char* _base; 107 char* _top; 108 char* _end; 109 bool _is_packed; 110 111 char* expand_top_to(char* newtop) { 112 assert(is_allocatable(), "must be initialized and not packed"); 113 assert(newtop >= _top, "must not grow backwards"); 114 if (newtop > _end) { 115 MetaspaceShared::report_out_of_space(_name, newtop - _top); 116 ShouldNotReachHere(); 117 } 118 MetaspaceShared::commit_shared_space_to(newtop); 119 _top = newtop; 120 return _top; 121 } 122 123 public: 124 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {} 125 126 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) { 127 char* p = (char*)align_up(_top, alignment); 128 char* newtop = p + align_up(num_bytes, alignment); 129 expand_top_to(newtop); 130 memset(p, 0, newtop - p); 131 return p; 132 } 133 134 void append_intptr_t(intptr_t n) { 135 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment"); 136 intptr_t *p = (intptr_t*)_top; 137 char* newtop = _top + sizeof(intptr_t); 138 expand_top_to(newtop); 139 *p = n; 140 } 141 142 char* base() const { return _base; } 143 char* top() const { return _top; } 144 char* end() const { return _end; } 145 size_t reserved() const { return _end - _base; } 146 size_t used() const { return _top - _base; } 147 bool is_packed() const { return _is_packed; } 148 bool is_allocatable() const { 149 return !is_packed() && _base != NULL; 150 } 151 152 double perc(size_t used, size_t total) const { 153 if (total == 0) { 154 total = 1; 155 } 156 return used / double(total) * 100.0; 157 } 158 159 void print(size_t total_bytes) const { 160 tty->print_cr("%s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT, 161 _name, used(), perc(used(), total_bytes), reserved(), perc(used(), reserved()), p2i(_base)); 162 } 163 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) { 164 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d", 165 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base)); 166 if (strcmp(_name, failing_region) == 0) { 167 tty->print_cr(" required = %d", int(needed_bytes)); 168 } else { 169 tty->cr(); 170 } 171 } 172 173 void init(const ReservedSpace* rs) { 174 _base = _top = rs->base(); 175 _end = rs->end(); 176 } 177 void init(char* b, char* t, char* e) { 178 _base = b; 179 _top = t; 180 _end = e; 181 } 182 183 void pack(DumpRegion* next = NULL) { 184 assert(!is_packed(), "sanity"); 185 _end = (char*)align_up(_top, Metaspace::reserve_alignment()); 186 _is_packed = true; 187 if (next != NULL) { 188 next->_base = next->_top = this->_end; 189 next->_end = MetaspaceShared::shared_rs()->end(); 190 } 191 } 192 bool contains(char* p) { 193 return base() <= p && p < top(); 194 } 195 }; 196 197 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od"); 198 DumpRegion _s0_region("s0"), _s1_region("s1"); 199 200 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) { 201 return _mc_region.allocate(num_bytes); 202 } 203 204 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) { 205 return _ro_region.allocate(num_bytes); 206 } 207 208 void MetaspaceShared::initialize_shared_rs() { 209 const size_t reserve_alignment = Metaspace::reserve_alignment(); 210 bool large_pages = false; // No large pages when dumping the CDS archive. 211 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment); 212 213 #ifdef _LP64 214 // On 64-bit VM, the heap and class space layout will be the same as if 215 // you're running in -Xshare:on mode: 216 // 217 // +-- SharedBaseAddress (default = 0x800000000) 218 // v 219 // +-..---------+----+ ... +----+----+----+----+----+---------------+ 220 // | Heap | ST | | MC | RW | RO | MD | OD | class space | 221 // +-..---------+----+ ... +----+----+----+----+----+---------------+ 222 // |<--MaxHeapSize->| |<-- UnscaledClassSpaceMax = 4GB ------->| 223 // 224 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); 225 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment); 226 #else 227 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space. 228 size_t cds_total = align_down(256*M, reserve_alignment); 229 #endif 230 231 // First try to reserve the space at the specified SharedBaseAddress. 232 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base); 233 if (_shared_rs.is_reserved()) { 234 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match"); 235 } else { 236 // Get a mmap region anywhere if the SharedBaseAddress fails. 237 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages); 238 } 239 if (!_shared_rs.is_reserved()) { 240 vm_exit_during_initialization("Unable to reserve memory for shared space", 241 err_msg(SIZE_FORMAT " bytes.", cds_total)); 242 } 243 244 #ifdef _LP64 245 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up: 246 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes() 247 // will store Klasses into this space. 248 // + The lower 3 GB is used for the archive -- when preload_classes() is done, 249 // ArchiveCompactor will copy the class metadata into this space, first the RW parts, 250 // then the RO parts. 251 252 assert(UseCompressedOops && UseCompressedClassPointers, 253 "UseCompressedOops and UseCompressedClassPointers must be set"); 254 255 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment); 256 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size); 257 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment); 258 _shared_rs = _shared_rs.first_part(max_archive_size); 259 260 // Set up compress class pointers. 261 Universe::set_narrow_klass_base((address)_shared_rs.base()); 262 if (UseAOT || cds_total > UnscaledClassSpaceMax) { 263 // AOT forces narrow_klass_shift=LogKlassAlignmentInBytes 264 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); 265 } else { 266 Universe::set_narrow_klass_shift(0); 267 } 268 269 Metaspace::initialize_class_space(tmp_class_space); 270 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 271 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 272 273 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 274 CompressedClassSpaceSize, p2i(tmp_class_space.base())); 275 #endif 276 277 // Start with 0 committed bytes. The memory will be committed as needed by 278 // MetaspaceShared::commit_shared_space_to(). 279 if (!_shared_vs.initialize(_shared_rs, 0)) { 280 vm_exit_during_initialization("Unable to allocate memory for shared space"); 281 } 282 283 _mc_region.init(&_shared_rs); 284 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 285 _shared_rs.size(), p2i(_shared_rs.base())); 286 } 287 288 void MetaspaceShared::commit_shared_space_to(char* newtop) { 289 assert(DumpSharedSpaces, "dump-time only"); 290 char* base = _shared_rs.base(); 291 size_t need_committed_size = newtop - base; 292 size_t has_committed_size = _shared_vs.committed_size(); 293 if (need_committed_size < has_committed_size) { 294 return; 295 } 296 297 size_t min_bytes = need_committed_size - has_committed_size; 298 size_t preferred_bytes = 1 * M; 299 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size; 300 301 size_t commit = MAX2(min_bytes, preferred_bytes); 302 assert(commit <= uncommitted, "sanity"); 303 304 bool result = _shared_vs.expand_by(commit, false); 305 if (!result) { 306 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes", 307 need_committed_size)); 308 } 309 310 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]", 311 commit, _shared_vs.actual_committed_size(), _shared_vs.high()); 312 } 313 314 // Read/write a data stream for restoring/preserving metadata pointers and 315 // miscellaneous data from/to the shared archive file. 316 317 void MetaspaceShared::serialize(SerializeClosure* soc) { 318 int tag = 0; 319 soc->do_tag(--tag); 320 321 // Verify the sizes of various metadata in the system. 322 soc->do_tag(sizeof(Method)); 323 soc->do_tag(sizeof(ConstMethod)); 324 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); 325 soc->do_tag(sizeof(ConstantPool)); 326 soc->do_tag(sizeof(ConstantPoolCache)); 327 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); 328 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); 329 soc->do_tag(sizeof(Symbol)); 330 331 // Dump/restore miscellaneous metadata. 332 Universe::serialize(soc, true); 333 soc->do_tag(--tag); 334 335 // Dump/restore references to commonly used names and signatures. 336 vmSymbols::serialize(soc); 337 soc->do_tag(--tag); 338 339 // Dump/restore the symbol and string tables 340 SymbolTable::serialize(soc); 341 StringTable::serialize(soc); 342 soc->do_tag(--tag); 343 344 soc->do_tag(666); 345 } 346 347 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) { 348 if (DumpSharedSpaces) { 349 if (_cds_i2i_entry_code_buffers == NULL) { 350 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size); 351 _cds_i2i_entry_code_buffers_size = total_size; 352 } 353 } else if (UseSharedSpaces) { 354 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized"); 355 } else { 356 return NULL; 357 } 358 359 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change"); 360 return _cds_i2i_entry_code_buffers; 361 } 362 363 // CDS code for dumping shared archive. 364 365 // Global object for holding classes that have been loaded. Since this 366 // is run at a safepoint just before exit, this is the entire set of classes. 367 static GrowableArray<Klass*>* _global_klass_objects; 368 class CollectClassesClosure : public KlassClosure { 369 void do_klass(Klass* k) { 370 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) { 371 _global_klass_objects->append_if_missing(k); 372 } 373 } 374 }; 375 376 static void remove_unshareable_in_classes() { 377 for (int i = 0; i < _global_klass_objects->length(); i++) { 378 Klass* k = _global_klass_objects->at(i); 379 k->remove_unshareable_info(); 380 } 381 } 382 383 static void rewrite_nofast_bytecode(Method* method) { 384 RawBytecodeStream bcs(method); 385 while (!bcs.is_last_bytecode()) { 386 Bytecodes::Code opcode = bcs.raw_next(); 387 switch (opcode) { 388 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 389 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 390 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 391 case Bytecodes::_iload: { 392 if (!bcs.is_wide()) { 393 *bcs.bcp() = Bytecodes::_nofast_iload; 394 } 395 break; 396 } 397 default: break; 398 } 399 } 400 } 401 402 // Walk all methods in the class list to ensure that they won't be modified at 403 // run time. This includes: 404 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 405 // at run time by RewriteBytecodes/RewriteFrequentPairs 406 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 407 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 408 for (int i = 0; i < _global_klass_objects->length(); i++) { 409 Klass* k = _global_klass_objects->at(i); 410 if (k->is_instance_klass()) { 411 InstanceKlass* ik = InstanceKlass::cast(k); 412 for (int i = 0; i < ik->methods()->length(); i++) { 413 Method* m = ik->methods()->at(i); 414 rewrite_nofast_bytecode(m); 415 Fingerprinter fp(m); 416 // The side effect of this call sets method's fingerprint field. 417 fp.fingerprint(); 418 } 419 } 420 } 421 } 422 423 static void relocate_cached_class_file() { 424 for (int i = 0; i < _global_klass_objects->length(); i++) { 425 Klass* k = _global_klass_objects->at(i); 426 if (k->is_instance_klass()) { 427 InstanceKlass* ik = InstanceKlass::cast(k); 428 JvmtiCachedClassFileData* p = ik->get_archived_class_data(); 429 if (p != NULL) { 430 int size = offset_of(JvmtiCachedClassFileData, data) + p->length; 431 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size); 432 q->length = p->length; 433 memcpy(q->data, p->data, p->length); 434 ik->set_archived_class_data(q); 435 } 436 } 437 } 438 } 439 440 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables. 441 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.) 442 // 443 // Addresses of the vtables and the methods may be different across JVM runs, 444 // if libjvm.so is dynamically loaded at a different base address. 445 // 446 // To ensure that the Metadata objects in the CDS archive always have the correct vtable: 447 // 448 // + at dump time: we redirect the _vptr to point to our own vtables inside 449 // the CDS image 450 // + at run time: we clone the actual contents of the vtables from libjvm.so 451 // into our own tables. 452 453 // Currently, the archive contain ONLY the following types of objects that have C++ vtables. 454 #define CPP_VTABLE_PATCH_TYPES_DO(f) \ 455 f(ConstantPool) \ 456 f(InstanceKlass) \ 457 f(InstanceClassLoaderKlass) \ 458 f(InstanceMirrorKlass) \ 459 f(InstanceRefKlass) \ 460 f(Method) \ 461 f(ObjArrayKlass) \ 462 f(TypeArrayKlass) 463 464 class CppVtableInfo { 465 intptr_t _vtable_size; 466 intptr_t _cloned_vtable[1]; 467 public: 468 static int num_slots(int vtable_size) { 469 return 1 + vtable_size; // Need to add the space occupied by _vtable_size; 470 } 471 int vtable_size() { return int(uintx(_vtable_size)); } 472 void set_vtable_size(int n) { _vtable_size = intptr_t(n); } 473 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } 474 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } 475 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo 476 static size_t byte_size(int vtable_size) { 477 CppVtableInfo i; 478 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1)); 479 } 480 }; 481 482 template <class T> class CppVtableCloner : public T { 483 static intptr_t* vtable_of(Metadata& m) { 484 return *((intptr_t**)&m); 485 } 486 static CppVtableInfo* _info; 487 488 static int get_vtable_length(const char* name); 489 490 public: 491 // Allocate and initialize the C++ vtable, starting from top, but do not go past end. 492 static intptr_t* allocate(const char* name); 493 494 // Clone the vtable to ... 495 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info); 496 497 static void zero_vtable_clone() { 498 assert(DumpSharedSpaces, "dump-time only"); 499 _info->zero(); 500 } 501 502 // Switch the vtable pointer to point to the cloned vtable. 503 static void patch(Metadata* obj) { 504 assert(DumpSharedSpaces, "dump-time only"); 505 *(void**)obj = (void*)(_info->cloned_vtable()); 506 } 507 508 static bool is_valid_shared_object(const T* obj) { 509 intptr_t* vptr = *(intptr_t**)obj; 510 return vptr == _info->cloned_vtable(); 511 } 512 }; 513 514 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL; 515 516 template <class T> 517 intptr_t* CppVtableCloner<T>::allocate(const char* name) { 518 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment"); 519 int n = get_vtable_length(name); 520 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t)); 521 _info->set_vtable_size(n); 522 523 intptr_t* p = clone_vtable(name, _info); 524 assert((char*)p == _md_region.top(), "must be"); 525 526 return p; 527 } 528 529 template <class T> 530 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) { 531 if (!DumpSharedSpaces) { 532 assert(_info == 0, "_info is initialized only at dump time"); 533 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method() 534 } 535 T tmp; // Allocate temporary dummy metadata object to get to the original vtable. 536 int n = info->vtable_size(); 537 intptr_t* srcvtable = vtable_of(tmp); 538 intptr_t* dstvtable = info->cloned_vtable(); 539 540 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are 541 // safe to do memcpy. 542 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name); 543 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n); 544 return dstvtable + n; 545 } 546 547 // To determine the size of the vtable for each type, we use the following 548 // trick by declaring 2 subclasses: 549 // 550 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} }; 551 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; }; 552 // 553 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties: 554 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N) 555 // - The first N entries have are exactly the same as in InstanceKlass's vtable. 556 // - Their last entry is different. 557 // 558 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables 559 // and find the first entry that's different. 560 // 561 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more 562 // esoteric compilers. 563 564 template <class T> class CppVtableTesterB: public T { 565 public: 566 virtual int last_virtual_method() {return 1;} 567 }; 568 569 template <class T> class CppVtableTesterA : public T { 570 public: 571 virtual void* last_virtual_method() { 572 // Make this different than CppVtableTesterB::last_virtual_method so the C++ 573 // compiler/linker won't alias the two functions. 574 return NULL; 575 } 576 }; 577 578 template <class T> 579 int CppVtableCloner<T>::get_vtable_length(const char* name) { 580 CppVtableTesterA<T> a; 581 CppVtableTesterB<T> b; 582 583 intptr_t* avtable = vtable_of(a); 584 intptr_t* bvtable = vtable_of(b); 585 586 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc) 587 int vtable_len = 1; 588 for (; ; vtable_len++) { 589 if (avtable[vtable_len] != bvtable[vtable_len]) { 590 break; 591 } 592 } 593 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name); 594 595 return vtable_len; 596 } 597 598 #define ALLOC_CPP_VTABLE_CLONE(c) \ 599 CppVtableCloner<c>::allocate(#c); 600 601 #define CLONE_CPP_VTABLE(c) \ 602 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p); 603 604 #define ZERO_CPP_VTABLE(c) \ 605 CppVtableCloner<c>::zero_vtable_clone(); 606 607 // This can be called at both dump time and run time. 608 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) { 609 assert(DumpSharedSpaces || UseSharedSpaces, "sanity"); 610 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE); 611 return p; 612 } 613 614 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() { 615 assert(DumpSharedSpaces, "dump-time only"); 616 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE); 617 } 618 619 // Allocate and initialize the C++ vtables, starting from top, but do not go past end. 620 void MetaspaceShared::allocate_cpp_vtable_clones() { 621 assert(DumpSharedSpaces, "dump-time only"); 622 // Layout (each slot is a intptr_t): 623 // [number of slots in the first vtable = n1] 624 // [ <n1> slots for the first vtable] 625 // [number of slots in the first second = n2] 626 // [ <n2> slots for the second vtable] 627 // ... 628 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro. 629 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE); 630 } 631 632 // Switch the vtable pointer to point to the cloned vtable. We assume the 633 // vtable pointer is in first slot in object. 634 void MetaspaceShared::patch_cpp_vtable_pointers() { 635 int n = _global_klass_objects->length(); 636 for (int i = 0; i < n; i++) { 637 Klass* obj = _global_klass_objects->at(i); 638 if (obj->is_instance_klass()) { 639 InstanceKlass* ik = InstanceKlass::cast(obj); 640 if (ik->is_class_loader_instance_klass()) { 641 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik); 642 } else if (ik->is_reference_instance_klass()) { 643 CppVtableCloner<InstanceRefKlass>::patch(ik); 644 } else if (ik->is_mirror_instance_klass()) { 645 CppVtableCloner<InstanceMirrorKlass>::patch(ik); 646 } else { 647 CppVtableCloner<InstanceKlass>::patch(ik); 648 } 649 ConstantPool* cp = ik->constants(); 650 CppVtableCloner<ConstantPool>::patch(cp); 651 for (int j = 0; j < ik->methods()->length(); j++) { 652 Method* m = ik->methods()->at(j); 653 CppVtableCloner<Method>::patch(m); 654 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be"); 655 } 656 } else if (obj->is_objArray_klass()) { 657 CppVtableCloner<ObjArrayKlass>::patch(obj); 658 } else { 659 assert(obj->is_typeArray_klass(), "sanity"); 660 CppVtableCloner<TypeArrayKlass>::patch(obj); 661 } 662 } 663 } 664 665 bool MetaspaceShared::is_valid_shared_method(const Method* m) { 666 assert(is_in_shared_space(m), "must be"); 667 return CppVtableCloner<Method>::is_valid_shared_object(m); 668 } 669 670 // Closure for serializing initialization data out to a data area to be 671 // written to the shared file. 672 673 class WriteClosure : public SerializeClosure { 674 private: 675 DumpRegion* _dump_region; 676 677 public: 678 WriteClosure(DumpRegion* r) { 679 _dump_region = r; 680 } 681 682 void do_ptr(void** p) { 683 _dump_region->append_intptr_t((intptr_t)*p); 684 } 685 686 void do_u4(u4* p) { 687 void* ptr = (void*)(uintx(*p)); 688 do_ptr(&ptr); 689 } 690 691 void do_tag(int tag) { 692 _dump_region->append_intptr_t((intptr_t)tag); 693 } 694 695 void do_region(u_char* start, size_t size) { 696 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 697 assert(size % sizeof(intptr_t) == 0, "bad size"); 698 do_tag((int)size); 699 while (size > 0) { 700 _dump_region->append_intptr_t(*(intptr_t*)start); 701 start += sizeof(intptr_t); 702 size -= sizeof(intptr_t); 703 } 704 } 705 706 bool reading() const { return false; } 707 }; 708 709 // This is for dumping detailed statistics for the allocations 710 // in the shared spaces. 711 class DumpAllocStats : public ResourceObj { 712 public: 713 714 // Here's poor man's enum inheritance 715 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ 716 METASPACE_OBJ_TYPES_DO(f) \ 717 f(SymbolHashentry) \ 718 f(SymbolBucket) \ 719 f(StringHashentry) \ 720 f(StringBucket) \ 721 f(Other) 722 723 enum Type { 724 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 725 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 726 _number_of_types 727 }; 728 729 static const char * type_name(Type type) { 730 switch(type) { 731 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 732 default: 733 ShouldNotReachHere(); 734 return NULL; 735 } 736 } 737 738 public: 739 enum { RO = 0, RW = 1 }; 740 741 int _counts[2][_number_of_types]; 742 int _bytes [2][_number_of_types]; 743 744 DumpAllocStats() { 745 memset(_counts, 0, sizeof(_counts)); 746 memset(_bytes, 0, sizeof(_bytes)); 747 }; 748 749 void record(MetaspaceObj::Type type, int byte_size, bool read_only) { 750 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 751 int which = (read_only) ? RO : RW; 752 _counts[which][type] ++; 753 _bytes [which][type] += byte_size; 754 } 755 756 void record_other_type(int byte_size, bool read_only) { 757 int which = (read_only) ? RO : RW; 758 _bytes [which][OtherType] += byte_size; 759 } 760 void print_stats(int ro_all, int rw_all, int mc_all, int md_all); 761 }; 762 763 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) { 764 // Calculate size of data that was not allocated by Metaspace::allocate() 765 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 766 767 // symbols 768 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count; 769 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes; 770 771 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count; 772 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes; 773 774 // strings 775 _counts[RO][StringHashentryType] = stats->string.hashentry_count; 776 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes; 777 778 _counts[RO][StringBucketType] = stats->string.bucket_count; 779 _bytes [RO][StringBucketType] = stats->string.bucket_bytes; 780 781 // TODO: count things like dictionary, vtable, etc 782 _bytes[RW][OtherType] += mc_all + md_all; 783 rw_all += mc_all + md_all; // mc/md are mapped Read/Write 784 785 // prevent divide-by-zero 786 if (ro_all < 1) { 787 ro_all = 1; 788 } 789 if (rw_all < 1) { 790 rw_all = 1; 791 } 792 793 int all_ro_count = 0; 794 int all_ro_bytes = 0; 795 int all_rw_count = 0; 796 int all_rw_bytes = 0; 797 798 // To make fmt_stats be a syntactic constant (for format warnings), use #define. 799 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 800 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 801 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 802 803 ResourceMark rm; 804 LogMessage(cds) msg; 805 stringStream info_stream; 806 807 info_stream.print_cr("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):"); 808 info_stream.print_cr("%s", hdr); 809 info_stream.print_cr("%s", sep); 810 for (int type = 0; type < int(_number_of_types); type ++) { 811 const char *name = type_name((Type)type); 812 int ro_count = _counts[RO][type]; 813 int ro_bytes = _bytes [RO][type]; 814 int rw_count = _counts[RW][type]; 815 int rw_bytes = _bytes [RW][type]; 816 int count = ro_count + rw_count; 817 int bytes = ro_bytes + rw_bytes; 818 819 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all); 820 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all); 821 double perc = 100.0 * double(bytes) / double(ro_all + rw_all); 822 823 info_stream.print_cr(fmt_stats, name, 824 ro_count, ro_bytes, ro_perc, 825 rw_count, rw_bytes, rw_perc, 826 count, bytes, perc); 827 828 all_ro_count += ro_count; 829 all_ro_bytes += ro_bytes; 830 all_rw_count += rw_count; 831 all_rw_bytes += rw_bytes; 832 } 833 834 int all_count = all_ro_count + all_rw_count; 835 int all_bytes = all_ro_bytes + all_rw_bytes; 836 837 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all); 838 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all); 839 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all); 840 841 info_stream.print_cr("%s", sep); 842 info_stream.print_cr(fmt_stats, "Total", 843 all_ro_count, all_ro_bytes, all_ro_perc, 844 all_rw_count, all_rw_bytes, all_rw_perc, 845 all_count, all_bytes, all_perc); 846 847 assert(all_ro_bytes == ro_all, "everything should have been counted"); 848 assert(all_rw_bytes == rw_all, "everything should have been counted"); 849 850 msg.info("%s", info_stream.as_string()); 851 #undef fmt_stats 852 } 853 854 // Populate the shared space. 855 856 class VM_PopulateDumpSharedSpace: public VM_Operation { 857 private: 858 GrowableArray<MemRegion> *_string_regions; 859 860 void dump_string_and_symbols(); 861 char* dump_read_only_tables(); 862 void print_region_stats(); 863 public: 864 865 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 866 void doit(); // outline because gdb sucks 867 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec); 868 }; // class VM_PopulateDumpSharedSpace 869 870 class SortedSymbolClosure: public SymbolClosure { 871 GrowableArray<Symbol*> _symbols; 872 virtual void do_symbol(Symbol** sym) { 873 assert((*sym)->is_permanent(), "archived symbols must be permanent"); 874 _symbols.append(*sym); 875 } 876 static int compare_symbols_by_address(Symbol** a, Symbol** b) { 877 if (a[0] < b[0]) { 878 return -1; 879 } else if (a[0] == b[0]) { 880 return 0; 881 } else { 882 return 1; 883 } 884 } 885 886 public: 887 SortedSymbolClosure() { 888 SymbolTable::symbols_do(this); 889 _symbols.sort(compare_symbols_by_address); 890 } 891 GrowableArray<Symbol*>* get_sorted_symbols() { 892 return &_symbols; 893 } 894 }; 895 896 // ArchiveCompactor -- 897 // 898 // This class is the central piece of shared archive compaction -- all metaspace data are 899 // initially allocated outside of the shared regions. ArchiveCompactor copies the 900 // metaspace data into their final location in the shared regions. 901 902 class ArchiveCompactor : AllStatic { 903 static DumpAllocStats* _alloc_stats; 904 static SortedSymbolClosure* _ssc; 905 906 static unsigned my_hash(const address& a) { 907 return primitive_hash<address>(a); 908 } 909 static bool my_equals(const address& a0, const address& a1) { 910 return primitive_equals<address>(a0, a1); 911 } 912 typedef ResourceHashtable< 913 address, address, 914 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address> 915 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address> 916 16384, ResourceObj::C_HEAP> RelocationTable; 917 static RelocationTable* _new_loc_table; 918 919 public: 920 static void initialize() { 921 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats; 922 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable; 923 } 924 static DumpAllocStats* alloc_stats() { 925 return _alloc_stats; 926 } 927 928 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) { 929 address obj = ref->obj(); 930 int bytes = ref->size() * BytesPerWord; 931 char* p; 932 size_t alignment = BytesPerWord; 933 char* oldtop; 934 char* newtop; 935 936 if (read_only) { 937 oldtop = _ro_region.top(); 938 p = _ro_region.allocate(bytes, alignment); 939 newtop = _ro_region.top(); 940 } else { 941 oldtop = _rw_region.top(); 942 p = _rw_region.allocate(bytes, alignment); 943 newtop = _rw_region.top(); 944 } 945 memcpy(p, obj, bytes); 946 bool isnew = _new_loc_table->put(obj, (address)p); 947 assert(isnew, "must be"); 948 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes); 949 950 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only); 951 if (ref->msotype() == MetaspaceObj::SymbolType) { 952 uintx delta = MetaspaceShared::object_delta(p); 953 if (delta > MAX_SHARED_DELTA) { 954 // This is just a sanity check and should not appear in any real world usage. This 955 // happens only if you allocate more than 2GB of Symbols and would require 956 // millions of shared classes. 957 vm_exit_during_initialization("Too many Symbols in the CDS archive", 958 "Please reduce the number of shared classes."); 959 } 960 } 961 } 962 963 static address get_new_loc(MetaspaceClosure::Ref* ref) { 964 address* pp = _new_loc_table->get(ref->obj()); 965 assert(pp != NULL, "must be"); 966 return *pp; 967 } 968 969 private: 970 // Makes a shallow copy of visited MetaspaceObj's 971 class ShallowCopier: public UniqueMetaspaceClosure { 972 bool _read_only; 973 public: 974 ShallowCopier(bool read_only) : _read_only(read_only) {} 975 976 virtual void do_unique_ref(Ref* ref, bool read_only) { 977 if (read_only == _read_only) { 978 allocate(ref, read_only); 979 } 980 } 981 }; 982 983 // Relocate embedded pointers within a MetaspaceObj's shallow copy 984 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure { 985 public: 986 virtual void do_unique_ref(Ref* ref, bool read_only) { 987 address new_loc = get_new_loc(ref); 988 RefRelocator refer; 989 ref->metaspace_pointers_do_at(&refer, new_loc); 990 } 991 }; 992 993 // Relocate a reference to point to its shallow copy 994 class RefRelocator: public MetaspaceClosure { 995 public: 996 virtual bool do_ref(Ref* ref, bool read_only) { 997 if (ref->not_null()) { 998 ref->update(get_new_loc(ref)); 999 } 1000 return false; // Do not recurse. 1001 } 1002 }; 1003 1004 #ifdef ASSERT 1005 class IsRefInArchiveChecker: public MetaspaceClosure { 1006 public: 1007 virtual bool do_ref(Ref* ref, bool read_only) { 1008 if (ref->not_null()) { 1009 char* obj = (char*)ref->obj(); 1010 assert(_ro_region.contains(obj) || _rw_region.contains(obj), 1011 "must be relocated to point to CDS archive"); 1012 } 1013 return false; // Do not recurse. 1014 } 1015 }; 1016 #endif 1017 1018 public: 1019 static void copy_and_compact() { 1020 // We should no longer allocate anything from the metaspace, so that 1021 // we can have a stable set of MetaspaceObjs to work with. 1022 Metaspace::freeze(); 1023 1024 ResourceMark rm; 1025 SortedSymbolClosure the_ssc; // StackObj 1026 _ssc = &the_ssc; 1027 1028 tty->print_cr("Scanning all metaspace objects ... "); 1029 { 1030 // allocate and shallow-copy RW objects, immediately following the MC region 1031 tty->print_cr("Allocating RW objects ... "); 1032 _mc_region.pack(&_rw_region); 1033 1034 ResourceMark rm; 1035 ShallowCopier rw_copier(false); 1036 iterate_roots(&rw_copier); 1037 } 1038 { 1039 // allocate and shallow-copy of RO object, immediately following the RW region 1040 tty->print_cr("Allocating RO objects ... "); 1041 _rw_region.pack(&_ro_region); 1042 1043 ResourceMark rm; 1044 ShallowCopier ro_copier(true); 1045 iterate_roots(&ro_copier); 1046 } 1047 { 1048 tty->print_cr("Relocating embedded pointers ... "); 1049 ResourceMark rm; 1050 ShallowCopyEmbeddedRefRelocator emb_reloc; 1051 iterate_roots(&emb_reloc); 1052 } 1053 { 1054 tty->print_cr("Relocating external roots ... "); 1055 ResourceMark rm; 1056 RefRelocator ext_reloc; 1057 iterate_roots(&ext_reloc); 1058 } 1059 1060 #ifdef ASSERT 1061 { 1062 tty->print_cr("Verifying external roots ... "); 1063 ResourceMark rm; 1064 IsRefInArchiveChecker checker; 1065 iterate_roots(&checker); 1066 } 1067 #endif 1068 1069 1070 // cleanup 1071 _ssc = NULL; 1072 } 1073 1074 // We must relocate the System::_well_known_klasses only after we have copied the 1075 // strings in during dump_string_and_symbols(): during the string copy, we operate on old 1076 // String objects which assert that their klass is the old 1077 // SystemDictionary::String_klass(). 1078 static void relocate_well_known_klasses() { 1079 { 1080 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... "); 1081 ResourceMark rm; 1082 RefRelocator ext_reloc; 1083 SystemDictionary::well_known_klasses_do(&ext_reloc); 1084 } 1085 // NOTE: after this point, we shouldn't have any globals that can reach the old 1086 // objects. 1087 1088 // We cannot use any of the objects in the heap anymore (except for the objects 1089 // in the CDS shared string regions) because their headers no longer point to 1090 // valid Klasses. 1091 } 1092 1093 static void iterate_roots(MetaspaceClosure* it) { 1094 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols(); 1095 for (int i=0; i<symbols->length(); i++) { 1096 it->push(symbols->adr_at(i)); 1097 } 1098 if (_global_klass_objects != NULL) { 1099 // Need to fix up the pointers 1100 for (int i = 0; i < _global_klass_objects->length(); i++) { 1101 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed. 1102 it->push(_global_klass_objects->adr_at(i)); 1103 } 1104 } 1105 FileMapInfo::metaspace_pointers_do(it); 1106 SystemDictionary::classes_do(it); 1107 Universe::metaspace_pointers_do(it); 1108 SymbolTable::metaspace_pointers_do(it); 1109 vmSymbols::metaspace_pointers_do(it); 1110 } 1111 1112 static Klass* get_relocated_klass(Klass* orig_klass) { 1113 address* pp = _new_loc_table->get((address)orig_klass); 1114 assert(pp != NULL, "must be"); 1115 Klass* klass = (Klass*)(*pp); 1116 assert(klass->is_klass(), "must be"); 1117 return klass; 1118 } 1119 }; 1120 1121 DumpAllocStats* ArchiveCompactor::_alloc_stats; 1122 SortedSymbolClosure* ArchiveCompactor::_ssc; 1123 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table; 1124 1125 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx, 1126 DumpRegion* dump_region, bool read_only, bool allow_exec) { 1127 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec); 1128 } 1129 1130 void VM_PopulateDumpSharedSpace::dump_string_and_symbols() { 1131 tty->print_cr("Dumping string and symbol tables ..."); 1132 1133 NOT_PRODUCT(SymbolTable::verify()); 1134 NOT_PRODUCT(StringTable::verify()); 1135 SymbolTable::write_to_archive(); 1136 1137 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details. 1138 _string_regions = new GrowableArray<MemRegion>(2); 1139 StringTable::write_to_archive(_string_regions); 1140 } 1141 1142 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() { 1143 char* oldtop = _ro_region.top(); 1144 // Reorder the system dictionary. Moving the symbols affects 1145 // how the hash table indices are calculated. 1146 SystemDictionary::reorder_dictionary_for_sharing(); 1147 NOT_PRODUCT(SystemDictionary::verify();) 1148 1149 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets(); 1150 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t)); 1151 SystemDictionary::copy_buckets(buckets_top, _ro_region.top()); 1152 1153 size_t table_bytes = SystemDictionary::count_bytes_for_table(); 1154 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t)); 1155 SystemDictionary::copy_table(table_top, _ro_region.top()); 1156 1157 // Write the other data to the output array. 1158 WriteClosure wc(&_ro_region); 1159 MetaspaceShared::serialize(&wc); 1160 1161 char* newtop = _ro_region.top(); 1162 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true); 1163 return buckets_top; 1164 } 1165 1166 void VM_PopulateDumpSharedSpace::doit() { 1167 Thread* THREAD = VMThread::vm_thread(); 1168 1169 NOT_PRODUCT(SystemDictionary::verify();) 1170 // The following guarantee is meant to ensure that no loader constraints 1171 // exist yet, since the constraints table is not shared. This becomes 1172 // more important now that we don't re-initialize vtables/itables for 1173 // shared classes at runtime, where constraints were previously created. 1174 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 1175 "loader constraints are not saved"); 1176 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 1177 "placeholders are not saved"); 1178 // Revisit and implement this if we prelink method handle call sites: 1179 guarantee(SystemDictionary::invoke_method_table() == NULL || 1180 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 1181 "invoke method table is not saved"); 1182 1183 // At this point, many classes have been loaded. 1184 // Gather systemDictionary classes in a global array and do everything to 1185 // that so we don't have to walk the SystemDictionary again. 1186 _global_klass_objects = new GrowableArray<Klass*>(1000); 1187 CollectClassesClosure collect_classes; 1188 ClassLoaderDataGraph::loaded_classes_do(&collect_classes); 1189 1190 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 1191 { 1192 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 1193 for (int i = 0; i < _global_klass_objects->length(); i++) { 1194 Klass* k = _global_klass_objects->at(i); 1195 if (k->is_instance_klass()) { 1196 num_inst ++; 1197 } else if (k->is_objArray_klass()) { 1198 num_obj_array ++; 1199 } else { 1200 assert(k->is_typeArray_klass(), "sanity"); 1201 num_type_array ++; 1202 } 1203 } 1204 tty->print_cr(" instance classes = %5d", num_inst); 1205 tty->print_cr(" obj array classes = %5d", num_obj_array); 1206 tty->print_cr(" type array classes = %5d", num_type_array); 1207 } 1208 1209 1210 // Ensure the ConstMethods won't be modified at run-time 1211 tty->print("Updating ConstMethods ... "); 1212 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 1213 tty->print_cr("done. "); 1214 1215 // Remove all references outside the metadata 1216 tty->print("Removing unshareable information ... "); 1217 remove_unshareable_in_classes(); 1218 tty->print_cr("done. "); 1219 1220 ArchiveCompactor::initialize(); 1221 ArchiveCompactor::copy_and_compact(); 1222 1223 dump_string_and_symbols(); 1224 ArchiveCompactor::relocate_well_known_klasses(); 1225 1226 char* read_only_tables_start = dump_read_only_tables(); 1227 _ro_region.pack(&_md_region); 1228 1229 char* vtbl_list = _md_region.top(); 1230 MetaspaceShared::allocate_cpp_vtable_clones(); 1231 _md_region.pack(&_od_region); 1232 1233 // Relocate the archived class file data into the od region 1234 relocate_cached_class_file(); 1235 _od_region.pack(); 1236 1237 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size 1238 // is just the spaces between the two ends. 1239 size_t core_spaces_size = _od_region.end() - _mc_region.base(); 1240 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()), 1241 "should already be aligned"); 1242 1243 // During patching, some virtual methods may be called, so at this point 1244 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate). 1245 MetaspaceShared::patch_cpp_vtable_pointers(); 1246 1247 // The vtable clones contain addresses of the current process. 1248 // We don't want to write these addresses into the archive. 1249 MetaspaceShared::zero_cpp_vtable_clones_for_writing(); 1250 1251 // Create and write the archive file that maps the shared spaces. 1252 1253 FileMapInfo* mapinfo = new FileMapInfo(); 1254 mapinfo->populate_header(os::vm_allocation_granularity()); 1255 mapinfo->set_read_only_tables_start(read_only_tables_start); 1256 mapinfo->set_misc_data_patching_start(vtbl_list); 1257 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers()); 1258 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size()); 1259 mapinfo->set_core_spaces_size(core_spaces_size); 1260 1261 char* s0_start, *s0_top, *s0_end; 1262 char* s1_start, *s1_top, *s1_end; 1263 1264 for (int pass=1; pass<=2; pass++) { 1265 if (pass == 1) { 1266 // The first pass doesn't actually write the data to disk. All it 1267 // does is to update the fields in the mapinfo->_header. 1268 } else { 1269 // After the first pass, the contents of mapinfo->_header are finalized, 1270 // so we can compute the header's CRC, and write the contents of the header 1271 // and the regions into disk. 1272 mapinfo->open_for_write(); 1273 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 1274 } 1275 mapinfo->write_header(); 1276 1277 // NOTE: md contains the trampoline code for method entries, which are patched at run time, 1278 // so it needs to be read/write. 1279 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true); 1280 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false); 1281 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false); 1282 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false); 1283 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false); 1284 1285 mapinfo->write_string_regions(_string_regions, 1286 &s0_start, &s0_top, &s0_end, 1287 &s1_start, &s1_top, &s1_end); 1288 } 1289 1290 mapinfo->close(); 1291 1292 // Restore the vtable in case we invoke any virtual methods. 1293 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list); 1294 1295 _s0_region.init(s0_start, s0_top, s0_end); 1296 _s1_region.init(s1_start, s1_top, s1_end); 1297 print_region_stats(); 1298 1299 if (log_is_enabled(Info, cds)) { 1300 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()), 1301 int(_mc_region.used()), int(_md_region.used())); 1302 } 1303 } 1304 1305 void VM_PopulateDumpSharedSpace::print_region_stats() { 1306 // Print statistics of all the regions 1307 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() + 1308 _mc_region.reserved() + _md_region.reserved() + 1309 _od_region.reserved() + 1310 _s0_region.reserved() + _s1_region.reserved(); 1311 const size_t total_bytes = _ro_region.used() + _rw_region.used() + 1312 _mc_region.used() + _md_region.used() + 1313 _od_region.used() + 1314 _s0_region.used() + _s1_region.used(); 1315 const double total_u_perc = total_bytes / double(total_reserved) * 100.0; 1316 1317 _mc_region.print(total_reserved); 1318 _rw_region.print(total_reserved); 1319 _ro_region.print(total_reserved); 1320 _md_region.print(total_reserved); 1321 _od_region.print(total_reserved); 1322 _s0_region.print(total_reserved); 1323 _s1_region.print(total_reserved); 1324 1325 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]", 1326 total_bytes, total_reserved, total_u_perc); 1327 } 1328 1329 1330 // Update a Java object to point its Klass* to the new location after 1331 // shared archive has been compacted. 1332 void MetaspaceShared::relocate_klass_ptr(oop o) { 1333 assert(DumpSharedSpaces, "sanity"); 1334 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass()); 1335 o->set_klass(k); 1336 } 1337 1338 class LinkSharedClassesClosure : public KlassClosure { 1339 Thread* THREAD; 1340 bool _made_progress; 1341 public: 1342 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {} 1343 1344 void reset() { _made_progress = false; } 1345 bool made_progress() const { return _made_progress; } 1346 1347 void do_klass(Klass* k) { 1348 if (k->is_instance_klass()) { 1349 InstanceKlass* ik = InstanceKlass::cast(k); 1350 // Link the class to cause the bytecodes to be rewritten and the 1351 // cpcache to be created. Class verification is done according 1352 // to -Xverify setting. 1353 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD); 1354 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1355 } 1356 } 1357 }; 1358 1359 class CheckSharedClassesClosure : public KlassClosure { 1360 bool _made_progress; 1361 public: 1362 CheckSharedClassesClosure() : _made_progress(false) {} 1363 1364 void reset() { _made_progress = false; } 1365 bool made_progress() const { return _made_progress; } 1366 void do_klass(Klass* k) { 1367 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) { 1368 _made_progress = true; 1369 } 1370 } 1371 }; 1372 1373 void MetaspaceShared::check_shared_class_loader_type(Klass* k) { 1374 if (k->is_instance_klass()) { 1375 InstanceKlass* ik = InstanceKlass::cast(k); 1376 u2 loader_type = ik->loader_type(); 1377 ResourceMark rm; 1378 guarantee(loader_type != 0, 1379 "Class loader type is not set for this class %s", ik->name()->as_C_string()); 1380 } 1381 } 1382 1383 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 1384 // We need to iterate because verification may cause additional classes 1385 // to be loaded. 1386 LinkSharedClassesClosure link_closure(THREAD); 1387 do { 1388 link_closure.reset(); 1389 ClassLoaderDataGraph::loaded_classes_do(&link_closure); 1390 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1391 } while (link_closure.made_progress()); 1392 1393 if (_has_error_classes) { 1394 // Mark all classes whose super class or interfaces failed verification. 1395 CheckSharedClassesClosure check_closure; 1396 do { 1397 // Not completely sure if we need to do this iteratively. Anyway, 1398 // we should come here only if there are unverifiable classes, which 1399 // shouldn't happen in normal cases. So better safe than sorry. 1400 check_closure.reset(); 1401 ClassLoaderDataGraph::loaded_classes_do(&check_closure); 1402 } while (check_closure.made_progress()); 1403 1404 if (IgnoreUnverifiableClassesDuringDump) { 1405 // This is useful when running JCK or SQE tests. You should not 1406 // enable this when running real apps. 1407 SystemDictionary::remove_classes_in_error_state(); 1408 } else { 1409 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 1410 exit(1); 1411 } 1412 } 1413 1414 // Copy the verification constraints from C_HEAP-alloced GrowableArrays to RO-alloced 1415 // Arrays 1416 SystemDictionaryShared::finalize_verification_constraints(); 1417 } 1418 1419 void MetaspaceShared::prepare_for_dumping() { 1420 Arguments::check_unsupported_dumping_properties(); 1421 ClassLoader::initialize_shared_path(); 1422 FileMapInfo::allocate_classpath_entry_table(); 1423 } 1424 1425 // Preload classes from a list, populate the shared spaces and dump to a 1426 // file. 1427 void MetaspaceShared::preload_and_dump(TRAPS) { 1428 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime)); 1429 ResourceMark rm; 1430 char class_list_path_str[JVM_MAXPATHLEN]; 1431 // Preload classes to be shared. 1432 // Should use some os:: method rather than fopen() here. aB. 1433 const char* class_list_path; 1434 if (SharedClassListFile == NULL) { 1435 // Construct the path to the class list (in jre/lib) 1436 // Walk up two directories from the location of the VM and 1437 // optionally tack on "lib" (depending on platform) 1438 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 1439 for (int i = 0; i < 3; i++) { 1440 char *end = strrchr(class_list_path_str, *os::file_separator()); 1441 if (end != NULL) *end = '\0'; 1442 } 1443 int class_list_path_len = (int)strlen(class_list_path_str); 1444 if (class_list_path_len >= 3) { 1445 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 1446 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 1447 jio_snprintf(class_list_path_str + class_list_path_len, 1448 sizeof(class_list_path_str) - class_list_path_len, 1449 "%slib", os::file_separator()); 1450 class_list_path_len += 4; 1451 } 1452 } 1453 } 1454 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 1455 jio_snprintf(class_list_path_str + class_list_path_len, 1456 sizeof(class_list_path_str) - class_list_path_len, 1457 "%sclasslist", os::file_separator()); 1458 } 1459 class_list_path = class_list_path_str; 1460 } else { 1461 class_list_path = SharedClassListFile; 1462 } 1463 1464 tty->print_cr("Loading classes to share ..."); 1465 _has_error_classes = false; 1466 int class_count = preload_classes(class_list_path, THREAD); 1467 if (ExtraSharedClassListFile) { 1468 class_count += preload_classes(ExtraSharedClassListFile, THREAD); 1469 } 1470 tty->print_cr("Loading classes to share: done."); 1471 1472 log_info(cds)("Shared spaces: preloaded %d classes", class_count); 1473 1474 // Rewrite and link classes 1475 tty->print_cr("Rewriting and linking classes ..."); 1476 1477 // Link any classes which got missed. This would happen if we have loaded classes that 1478 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 1479 // fails verification, all other interfaces that were not specified in the classlist but 1480 // are implemented by K are not verified. 1481 link_and_cleanup_shared_classes(CATCH); 1482 tty->print_cr("Rewriting and linking classes: done"); 1483 1484 VM_PopulateDumpSharedSpace op; 1485 VMThread::execute(&op); 1486 } 1487 1488 if (PrintSystemDictionaryAtExit) { 1489 SystemDictionary::print(); 1490 } 1491 1492 // Since various initialization steps have been undone by this process, 1493 // it is not reasonable to continue running a java process. 1494 exit(0); 1495 } 1496 1497 1498 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) { 1499 ClassListParser parser(class_list_path); 1500 int class_count = 0; 1501 1502 while (parser.parse_one_line()) { 1503 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD); 1504 1505 CLEAR_PENDING_EXCEPTION; 1506 if (klass != NULL) { 1507 if (log_is_enabled(Trace, cds)) { 1508 ResourceMark rm; 1509 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name()); 1510 } 1511 1512 InstanceKlass* ik = InstanceKlass::cast(klass); 1513 1514 // Link the class to cause the bytecodes to be rewritten and the 1515 // cpcache to be created. The linking is done as soon as classes 1516 // are loaded in order that the related data structures (klass and 1517 // cpCache) are located together. 1518 try_link_class(ik, THREAD); 1519 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1520 1521 class_count++; 1522 } 1523 } 1524 1525 return class_count; 1526 } 1527 1528 // Returns true if the class's status has changed 1529 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 1530 assert(DumpSharedSpaces, "should only be called during dumping"); 1531 if (ik->init_state() < InstanceKlass::linked) { 1532 bool saved = BytecodeVerificationLocal; 1533 if (!(ik->is_shared_boot_class())) { 1534 // The verification decision is based on BytecodeVerificationRemote 1535 // for non-system classes. Since we are using the NULL classloader 1536 // to load non-system classes during dumping, we need to temporarily 1537 // change BytecodeVerificationLocal to be the same as 1538 // BytecodeVerificationRemote. Note this can cause the parent system 1539 // classes also being verified. The extra overhead is acceptable during 1540 // dumping. 1541 BytecodeVerificationLocal = BytecodeVerificationRemote; 1542 } 1543 ik->link_class(THREAD); 1544 if (HAS_PENDING_EXCEPTION) { 1545 ResourceMark rm; 1546 tty->print_cr("Preload Warning: Verification failed for %s", 1547 ik->external_name()); 1548 CLEAR_PENDING_EXCEPTION; 1549 ik->set_in_error_state(); 1550 _has_error_classes = true; 1551 } 1552 BytecodeVerificationLocal = saved; 1553 return true; 1554 } else { 1555 return false; 1556 } 1557 } 1558 1559 // Closure for serializing initialization data in from a data area 1560 // (ptr_array) read from the shared file. 1561 1562 class ReadClosure : public SerializeClosure { 1563 private: 1564 intptr_t** _ptr_array; 1565 1566 inline intptr_t nextPtr() { 1567 return *(*_ptr_array)++; 1568 } 1569 1570 public: 1571 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 1572 1573 void do_ptr(void** p) { 1574 assert(*p == NULL, "initializing previous initialized pointer."); 1575 intptr_t obj = nextPtr(); 1576 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 1577 "hit tag while initializing ptrs."); 1578 *p = (void*)obj; 1579 } 1580 1581 void do_u4(u4* p) { 1582 intptr_t obj = nextPtr(); 1583 *p = (u4)(uintx(obj)); 1584 } 1585 1586 void do_tag(int tag) { 1587 int old_tag; 1588 old_tag = (int)(intptr_t)nextPtr(); 1589 // do_int(&old_tag); 1590 assert(tag == old_tag, "old tag doesn't match"); 1591 FileMapInfo::assert_mark(tag == old_tag); 1592 } 1593 1594 void do_region(u_char* start, size_t size) { 1595 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 1596 assert(size % sizeof(intptr_t) == 0, "bad size"); 1597 do_tag((int)size); 1598 while (size > 0) { 1599 *(intptr_t*)start = nextPtr(); 1600 start += sizeof(intptr_t); 1601 size -= sizeof(intptr_t); 1602 } 1603 } 1604 1605 bool reading() const { return true; } 1606 }; 1607 1608 // Return true if given address is in the mapped shared space. 1609 bool MetaspaceShared::is_in_shared_space(const void* p) { 1610 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p); 1611 } 1612 1613 // Return true if given address is in the misc data region 1614 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) { 1615 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx); 1616 } 1617 1618 bool MetaspaceShared::is_in_trampoline_frame(address addr) { 1619 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) { 1620 return true; 1621 } 1622 return false; 1623 } 1624 1625 void MetaspaceShared::print_shared_spaces() { 1626 if (UseSharedSpaces) { 1627 FileMapInfo::current_info()->print_shared_spaces(); 1628 } 1629 } 1630 1631 1632 // Map shared spaces at requested addresses and return if succeeded. 1633 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 1634 size_t image_alignment = mapinfo->alignment(); 1635 1636 #ifndef _WINDOWS 1637 // Map in the shared memory and then map the regions on top of it. 1638 // On Windows, don't map the memory here because it will cause the 1639 // mappings of the regions to fail. 1640 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 1641 if (!shared_rs.is_reserved()) return false; 1642 #endif 1643 1644 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 1645 1646 char* _ro_base = NULL; 1647 char* _rw_base = NULL; 1648 char* _mc_base = NULL; 1649 char* _md_base = NULL; 1650 char* _od_base = NULL; 1651 1652 // Map each shared region 1653 if ((_mc_base = mapinfo->map_region(mc)) != NULL && 1654 mapinfo->verify_region_checksum(mc) && 1655 (_rw_base = mapinfo->map_region(rw)) != NULL && 1656 mapinfo->verify_region_checksum(rw) && 1657 (_ro_base = mapinfo->map_region(ro)) != NULL && 1658 mapinfo->verify_region_checksum(ro) && 1659 (_md_base = mapinfo->map_region(md)) != NULL && 1660 mapinfo->verify_region_checksum(md) && 1661 (_od_base = mapinfo->map_region(od)) != NULL && 1662 mapinfo->verify_region_checksum(od) && 1663 (image_alignment == (size_t)os::vm_allocation_granularity()) && 1664 mapinfo->validate_classpath_entry_table()) { 1665 // Success (no need to do anything) 1666 return true; 1667 } else { 1668 // If there was a failure in mapping any of the spaces, unmap the ones 1669 // that succeeded 1670 if (_ro_base != NULL) mapinfo->unmap_region(ro); 1671 if (_rw_base != NULL) mapinfo->unmap_region(rw); 1672 if (_mc_base != NULL) mapinfo->unmap_region(mc); 1673 if (_md_base != NULL) mapinfo->unmap_region(md); 1674 if (_od_base != NULL) mapinfo->unmap_region(od); 1675 #ifndef _WINDOWS 1676 // Release the entire mapped region 1677 shared_rs.release(); 1678 #endif 1679 // If -Xshare:on is specified, print out the error message and exit VM, 1680 // otherwise, set UseSharedSpaces to false and continue. 1681 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 1682 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 1683 } else { 1684 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1685 } 1686 return false; 1687 } 1688 } 1689 1690 // Read the miscellaneous data from the shared file, and 1691 // serialize it out to its various destinations. 1692 1693 void MetaspaceShared::initialize_shared_spaces() { 1694 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1695 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers(); 1696 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size(); 1697 _core_spaces_size = mapinfo->core_spaces_size(); 1698 char* buffer = mapinfo->misc_data_patching_start(); 1699 clone_cpp_vtables((intptr_t*)buffer); 1700 1701 // The rest of the data is now stored in the RW region 1702 buffer = mapinfo->read_only_tables_start(); 1703 int sharedDictionaryLen = *(intptr_t*)buffer; 1704 buffer += sizeof(intptr_t); 1705 int number_of_entries = *(intptr_t*)buffer; 1706 buffer += sizeof(intptr_t); 1707 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 1708 sharedDictionaryLen, 1709 number_of_entries); 1710 buffer += sharedDictionaryLen; 1711 1712 // The following data are the linked list elements 1713 // (HashtableEntry objects) for the shared dictionary table. 1714 1715 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 1716 buffer += sizeof(intptr_t); 1717 buffer += len; 1718 1719 // Verify various attributes of the archive, plus initialize the 1720 // shared string/symbol tables 1721 intptr_t* array = (intptr_t*)buffer; 1722 ReadClosure rc(&array); 1723 serialize(&rc); 1724 1725 // Initialize the run-time symbol table. 1726 SymbolTable::create_table(); 1727 1728 // Close the mapinfo file 1729 mapinfo->close(); 1730 1731 if (PrintSharedArchiveAndExit) { 1732 if (PrintSharedDictionary) { 1733 tty->print_cr("\nShared classes:\n"); 1734 SystemDictionary::print_shared(tty); 1735 } 1736 if (_archive_loading_failed) { 1737 tty->print_cr("archive is invalid"); 1738 vm_exit(1); 1739 } else { 1740 tty->print_cr("archive is valid"); 1741 vm_exit(0); 1742 } 1743 } 1744 } 1745 1746 void MetaspaceShared::fixup_shared_string_regions() { 1747 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1748 mapinfo->fixup_string_regions(); 1749 } 1750 1751 // JVM/TI RedefineClasses() support: 1752 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 1753 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1754 1755 if (UseSharedSpaces) { 1756 // remap the shared readonly space to shared readwrite, private 1757 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1758 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 1759 return false; 1760 } 1761 _remapped_readwrite = true; 1762 } 1763 return true; 1764 } 1765 1766 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) { 1767 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space. 1768 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes 1769 // or so. 1770 _mc_region.print_out_of_space_msg(name, needed_bytes); 1771 _rw_region.print_out_of_space_msg(name, needed_bytes); 1772 _ro_region.print_out_of_space_msg(name, needed_bytes); 1773 _md_region.print_out_of_space_msg(name, needed_bytes); 1774 _od_region.print_out_of_space_msg(name, needed_bytes); 1775 1776 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name), 1777 "Please reduce the number of shared classes."); 1778 }