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#if INCLUDE_ALL_GCS 38#include "gc/g1/g1Allocator.inline.hpp" 39#include "gc/g1/g1CollectedHeap.hpp" 40#include "gc/g1/g1SATBCardTableModRefBS.hpp" 41#endif 42#include "gc/shared/gcLocker.hpp" 43#include "interpreter/bytecodeStream.hpp" 44#include "interpreter/bytecodes.hpp" 45#include "logging/log.hpp" 46#include "logging/logMessage.hpp" 47#include "memory/filemap.hpp" 48#include "memory/metaspace.hpp" 49#include "memory/metaspaceShared.hpp" 50#include "memory/resourceArea.hpp" 51#include "oops/instanceClassLoaderKlass.hpp" 52#include "oops/instanceMirrorKlass.hpp" 53#include "oops/instanceRefKlass.hpp" 54#include "oops/objArrayKlass.hpp" 55#include "oops/objArrayOop.hpp" 56#include "oops/oop.inline.hpp" 57#include "oops/typeArrayKlass.hpp" 58#include "prims/jvm.h" 59#include "prims/jvmtiRedefineClasses.hpp" 60#include "runtime/timerTrace.hpp" 61#include "runtime/os.hpp" 62#include "runtime/signature.hpp" 63#include "runtime/vmThread.hpp" 64#include "runtime/vm_operations.hpp" 65#include "utilities/align.hpp" 66#include "utilities/defaultStream.hpp" 67#include "utilities/hashtable.inline.hpp" 68#include "memory/metaspaceClosure.hpp" 69 70ReservedSpace MetaspaceShared::_shared_rs; 71VirtualSpace MetaspaceShared::_shared_vs; 72MetaspaceSharedStats MetaspaceShared::_stats; 73bool MetaspaceShared::_has_error_classes; 74bool MetaspaceShared::_archive_loading_failed = false; 75bool MetaspaceShared::_remapped_readwrite = false; 76bool MetaspaceShared::_open_archive_heap_region_mapped = false; 77address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL; 78size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0; 79size_t MetaspaceShared::_core_spaces_size = 0; 80 81// The CDS archive is divided into the following regions: 82// mc - misc code (the method entry trampolines) 83// rw - read-write metadata 84// ro - read-only metadata and read-only tables 85// md - misc data (the c++ vtables) 86// od - optional data (original class files) 87// 88// s0 - shared strings(closed archive heap space) #0 89// s1 - shared strings(closed archive heap space) #1 (may be empty) 90// oa0 - open archive heap space #0 91// oa1 - open archive heap space #1 (may be empty) 92// 93// The mc, rw, ro, md and od regions are linearly allocated, starting from 94// SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions 95// are page-aligned, and there's no gap between any consecutive regions. 96// 97// These 5 regions are populated in the following steps: 98// [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are 99// temporarily allocated outside of the shared regions. Only the method entry 100// trampolines are written into the mc region. 101// [2] ArchiveCompactor copies RW metadata into the rw region. 102// [3] ArchiveCompactor copies RO metadata into the ro region. 103// [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data 104// are copied into the ro region as read-only tables. 105// [5] C++ vtables are copied into the md region. 106// [6] Original class files are copied into the od region. 107// 108// The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects. 109// Their layout is independent of the other 5 regions. 110 111class DumpRegion { 112private: 113 const char* _name; 114 char* _base; 115 char* _top; 116 char* _end; 117 bool _is_packed; 118 119 char* expand_top_to(char* newtop) { 120 assert(is_allocatable(), "must be initialized and not packed"); 121 assert(newtop >= _top, "must not grow backwards"); 122 if (newtop > _end) { 123 MetaspaceShared::report_out_of_space(_name, newtop - _top); 124 ShouldNotReachHere(); 125 } 126 MetaspaceShared::commit_shared_space_to(newtop); 127 _top = newtop; 128 return _top; 129 } 130 131public: 132 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {} 133 134 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) { 135 char* p = (char*)align_up(_top, alignment); 136 char* newtop = p + align_up(num_bytes, alignment); 137 expand_top_to(newtop); 138 memset(p, 0, newtop - p); 139 return p; 140 } 141 142 void append_intptr_t(intptr_t n) { 143 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment"); 144 intptr_t *p = (intptr_t*)_top; 145 char* newtop = _top + sizeof(intptr_t); 146 expand_top_to(newtop); 147 *p = n; 148 } 149 150 char* base() const { return _base; } 151 char* top() const { return _top; } 152 char* end() const { return _end; } 153 size_t reserved() const { return _end - _base; } 154 size_t used() const { return _top - _base; } 155 bool is_packed() const { return _is_packed; } 156 bool is_allocatable() const { 157 return !is_packed() && _base != NULL; 158 } 159 160 double perc(size_t used, size_t total) const { 161 if (total == 0) { 162 total = 1; 163 } 164 return used / double(total) * 100.0; 165 } 166 167 void print(size_t total_bytes) const { 168 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, 169 _name, used(), perc(used(), total_bytes), reserved(), perc(used(), reserved()), p2i(_base)); 170 } 171 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) { 172 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d", 173 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base)); 174 if (strcmp(_name, failing_region) == 0) { 175 tty->print_cr(" required = %d", int(needed_bytes)); 176 } else { 177 tty->cr(); 178 } 179 } 180 181 void init(const ReservedSpace* rs) { 182 _base = _top = rs->base(); 183 _end = rs->end(); 184 } 185 void init(char* b, char* t, char* e) { 186 _base = b; 187 _top = t; 188 _end = e; 189 } 190 191 void pack(DumpRegion* next = NULL) { 192 assert(!is_packed(), "sanity"); 193 _end = (char*)align_up(_top, Metaspace::reserve_alignment()); 194 _is_packed = true; 195 if (next != NULL) { 196 next->_base = next->_top = this->_end; 197 next->_end = MetaspaceShared::shared_rs()->end(); 198 } 199 } 200 bool contains(char* p) { 201 return base() <= p && p < top(); 202 } 203}; 204 205 206DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od"); 207size_t _total_string_region_size = 0, _total_open_archive_region_size = 0; 208 209char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) { 210 return _mc_region.allocate(num_bytes); 211} 212 213char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) { 214 return _ro_region.allocate(num_bytes); 215} 216 217void MetaspaceShared::initialize_shared_rs() { 218 const size_t reserve_alignment = Metaspace::reserve_alignment(); 219 bool large_pages = false; // No large pages when dumping the CDS archive. 220 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment); 221 222#ifdef _LP64 223 // On 64-bit VM, the heap and class space layout will be the same as if 224 // you're running in -Xshare:on mode: 225 // 226 // +-- SharedBaseAddress (default = 0x800000000) 227 // v 228 // +-..---------+----+ ... +----+----+----+----+----+---------------+ 229 // | Heap | ST | | MC | RW | RO | MD | OD | class space | 230 // +-..---------+----+ ... +----+----+----+----+----+---------------+ 231 // |<--MaxHeapSize->| |<-- UnscaledClassSpaceMax = 4GB ------->| 232 // 233 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); 234 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment); 235#else 236 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space. 237 size_t cds_total = align_down(256*M, reserve_alignment); 238#endif 239 240 // First try to reserve the space at the specified SharedBaseAddress. 241 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base); 242 if (_shared_rs.is_reserved()) { 243 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match"); 244 } else { 245 // Get a mmap region anywhere if the SharedBaseAddress fails. 246 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages); 247 } 248 if (!_shared_rs.is_reserved()) { 249 vm_exit_during_initialization("Unable to reserve memory for shared space", 250 err_msg(SIZE_FORMAT " bytes.", cds_total)); 251 } 252 253#ifdef _LP64 254 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up: 255 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes() 256 // will store Klasses into this space. 257 // + The lower 3 GB is used for the archive -- when preload_classes() is done, 258 // ArchiveCompactor will copy the class metadata into this space, first the RW parts, 259 // then the RO parts. 260 261 assert(UseCompressedOops && UseCompressedClassPointers, 262 "UseCompressedOops and UseCompressedClassPointers must be set"); 263 264 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment); 265 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size); 266 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment); 267 _shared_rs = _shared_rs.first_part(max_archive_size); 268 269 // Set up compress class pointers. 270 Universe::set_narrow_klass_base((address)_shared_rs.base()); 271 if (UseAOT || cds_total > UnscaledClassSpaceMax) { 272 // AOT forces narrow_klass_shift=LogKlassAlignmentInBytes 273 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); 274 } else { 275 Universe::set_narrow_klass_shift(0); 276 } 277 278 Metaspace::initialize_class_space(tmp_class_space); 279 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 280 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 281 282 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 283 CompressedClassSpaceSize, p2i(tmp_class_space.base())); 284#endif 285 286 // Start with 0 committed bytes. The memory will be committed as needed by 287 // MetaspaceShared::commit_shared_space_to(). 288 if (!_shared_vs.initialize(_shared_rs, 0)) { 289 vm_exit_during_initialization("Unable to allocate memory for shared space"); 290 } 291 292 _mc_region.init(&_shared_rs); 293 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 294 _shared_rs.size(), p2i(_shared_rs.base())); 295} 296 297void MetaspaceShared::commit_shared_space_to(char* newtop) { 298 assert(DumpSharedSpaces, "dump-time only"); 299 char* base = _shared_rs.base(); 300 size_t need_committed_size = newtop - base; 301 size_t has_committed_size = _shared_vs.committed_size(); 302 if (need_committed_size < has_committed_size) { 303 return; 304 } 305 306 size_t min_bytes = need_committed_size - has_committed_size; 307 size_t preferred_bytes = 1 * M; 308 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size; 309 310 size_t commit = MAX2(min_bytes, preferred_bytes); 311 assert(commit <= uncommitted, "sanity"); 312 313 bool result = _shared_vs.expand_by(commit, false); 314 if (!result) { 315 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes", 316 need_committed_size)); 317 } 318 319 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]", 320 commit, _shared_vs.actual_committed_size(), _shared_vs.high()); 321} 322 323// Read/write a data stream for restoring/preserving metadata pointers and 324// miscellaneous data from/to the shared archive file. 325 326void MetaspaceShared::serialize(SerializeClosure* soc) { 327 int tag = 0; 328 soc->do_tag(--tag); 329 330 // Verify the sizes of various metadata in the system. 331 soc->do_tag(sizeof(Method)); 332 soc->do_tag(sizeof(ConstMethod)); 333 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); 334 soc->do_tag(sizeof(ConstantPool)); 335 soc->do_tag(sizeof(ConstantPoolCache)); 336 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); 337 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); 338 soc->do_tag(sizeof(Symbol)); 339 340 // Dump/restore miscellaneous metadata. 341 Universe::serialize(soc, true); 342 soc->do_tag(--tag); 343 344 // Dump/restore references to commonly used names and signatures. 345 vmSymbols::serialize(soc); 346 soc->do_tag(--tag); 347 348 // Dump/restore the symbol and string tables 349 SymbolTable::serialize(soc); 350 StringTable::serialize(soc); 351 soc->do_tag(--tag); 352 353 soc->do_tag(666); 354} 355 356address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) { 357 if (DumpSharedSpaces) { 358 if (_cds_i2i_entry_code_buffers == NULL) { 359 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size); 360 _cds_i2i_entry_code_buffers_size = total_size; 361 } 362 } else if (UseSharedSpaces) { 363 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized"); 364 } else { 365 return NULL; 366 } 367 368 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change"); 369 return _cds_i2i_entry_code_buffers; 370} 371 372// CDS code for dumping shared archive. 373 374// Global object for holding classes that have been loaded. Since this 375// is run at a safepoint just before exit, this is the entire set of classes. 376static GrowableArray<Klass*>* _global_klass_objects; 377 378static void collect_array_classes(Klass* k) { 379 _global_klass_objects->append_if_missing(k); 380 if (k->is_array_klass()) { 381 // Add in the array classes too 382 ArrayKlass* ak = ArrayKlass::cast(k); 383 Klass* h = ak->higher_dimension(); 384 if (h != NULL) { 385 h->array_klasses_do(collect_array_classes); 386 } 387 } 388} 389 390class CollectClassesClosure : public KlassClosure { 391 void do_klass(Klass* k) { 392 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) { 393 _global_klass_objects->append_if_missing(k); 394 } 395 if (k->is_array_klass()) { 396 // Add in the array classes too 397 ArrayKlass* ak = ArrayKlass::cast(k); 398 Klass* h = ak->higher_dimension(); 399 if (h != NULL) { 400 h->array_klasses_do(collect_array_classes); 401 } 402 } 403 } 404}; 405 406static void remove_unshareable_in_classes() { 407 for (int i = 0; i < _global_klass_objects->length(); i++) { 408 Klass* k = _global_klass_objects->at(i); 409 if (!k->is_objArray_klass()) { 410 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 411 // on their array classes. 412 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 413 k->remove_unshareable_info(); 414 } 415 } 416} 417 418static void remove_java_mirror_in_classes() { 419 for (int i = 0; i < _global_klass_objects->length(); i++) { 420 Klass* k = _global_klass_objects->at(i); 421 if (!k->is_objArray_klass()) { 422 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 423 // on their array classes. 424 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 425 k->remove_java_mirror(); 426 } 427 } 428} 429 430static void rewrite_nofast_bytecode(Method* method) { 431 BytecodeStream bcs(method); 432 while (!bcs.is_last_bytecode()) { 433 Bytecodes::Code opcode = bcs.next(); 434 switch (opcode) { 435 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 436 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 437 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 438 case Bytecodes::_iload: { 439 if (!bcs.is_wide()) { 440 *bcs.bcp() = Bytecodes::_nofast_iload; 441 } 442 break; 443 } 444 default: break; 445 } 446 } 447} 448 449// Walk all methods in the class list to ensure that they won't be modified at 450// run time. This includes: 451// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 452// at run time by RewriteBytecodes/RewriteFrequentPairs 453// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 454static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 455 for (int i = 0; i < _global_klass_objects->length(); i++) { 456 Klass* k = _global_klass_objects->at(i); 457 if (k->is_instance_klass()) { 458 InstanceKlass* ik = InstanceKlass::cast(k); 459 for (int i = 0; i < ik->methods()->length(); i++) { 460 Method* m = ik->methods()->at(i); 461 rewrite_nofast_bytecode(m); 462 Fingerprinter fp(m); 463 // The side effect of this call sets method's fingerprint field. 464 fp.fingerprint(); 465 } 466 } 467 } 468} 469 470static void relocate_cached_class_file() { 471 for (int i = 0; i < _global_klass_objects->length(); i++) { 472 Klass* k = _global_klass_objects->at(i); 473 if (k->is_instance_klass()) { 474 InstanceKlass* ik = InstanceKlass::cast(k); 475 JvmtiCachedClassFileData* p = ik->get_archived_class_data(); 476 if (p != NULL) { 477 int size = offset_of(JvmtiCachedClassFileData, data) + p->length; 478 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size); 479 q->length = p->length; 480 memcpy(q->data, p->data, p->length); 481 ik->set_archived_class_data(q); 482 } 483 } 484 } 485} 486 487NOT_PRODUCT( 488static void assert_not_anonymous_class(InstanceKlass* k) { 489 assert(!(k->is_anonymous()), "cannot archive anonymous classes"); 490} 491 492// Anonymous classes are not stored inside any dictionaries. They are created by 493// SystemDictionary::parse_stream() with a non-null host_klass. 494static void assert_no_anonymoys_classes_in_dictionaries() { 495 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class); 496}) 497 498// Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables. 499// (In GCC this is the field <Type>::_vptr, i.e., first word in the object.) 500// 501// Addresses of the vtables and the methods may be different across JVM runs, 502// if libjvm.so is dynamically loaded at a different base address. 503// 504// To ensure that the Metadata objects in the CDS archive always have the correct vtable: 505// 506// + at dump time: we redirect the _vptr to point to our own vtables inside 507// the CDS image 508// + at run time: we clone the actual contents of the vtables from libjvm.so 509// into our own tables. 510 511// Currently, the archive contain ONLY the following types of objects that have C++ vtables. 512#define CPP_VTABLE_PATCH_TYPES_DO(f) \ 513 f(ConstantPool) \ 514 f(InstanceKlass) \ 515 f(InstanceClassLoaderKlass) \ 516 f(InstanceMirrorKlass) \ 517 f(InstanceRefKlass) \ 518 f(Method) \ 519 f(ObjArrayKlass) \ 520 f(TypeArrayKlass) 521 522class CppVtableInfo { 523 intptr_t _vtable_size; 524 intptr_t _cloned_vtable[1]; 525public: 526 static int num_slots(int vtable_size) { 527 return 1 + vtable_size; // Need to add the space occupied by _vtable_size; 528 } 529 int vtable_size() { return int(uintx(_vtable_size)); } 530 void set_vtable_size(int n) { _vtable_size = intptr_t(n); } 531 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } 532 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } 533 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo 534 static size_t byte_size(int vtable_size) { 535 CppVtableInfo i; 536 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1)); 537 } 538}; 539 540template <class T> class CppVtableCloner : public T { 541 static intptr_t* vtable_of(Metadata& m) { 542 return *((intptr_t**)&m); 543 } 544 static CppVtableInfo* _info; 545 546 static int get_vtable_length(const char* name); 547 548public: 549 // Allocate and initialize the C++ vtable, starting from top, but do not go past end. 550 static intptr_t* allocate(const char* name); 551 552 // Clone the vtable to ... 553 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info); 554 555 static void zero_vtable_clone() { 556 assert(DumpSharedSpaces, "dump-time only"); 557 _info->zero(); 558 } 559 560 // Switch the vtable pointer to point to the cloned vtable. 561 static void patch(Metadata* obj) { 562 assert(DumpSharedSpaces, "dump-time only"); 563 *(void**)obj = (void*)(_info->cloned_vtable()); 564 } 565 566 static bool is_valid_shared_object(const T* obj) { 567 intptr_t* vptr = *(intptr_t**)obj; 568 return vptr == _info->cloned_vtable(); 569 } 570}; 571 572template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL; 573 574template <class T> 575intptr_t* CppVtableCloner<T>::allocate(const char* name) { 576 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment"); 577 int n = get_vtable_length(name); 578 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t)); 579 _info->set_vtable_size(n); 580 581 intptr_t* p = clone_vtable(name, _info); 582 assert((char*)p == _md_region.top(), "must be"); 583 584 return p; 585} 586 587template <class T> 588intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) { 589 if (!DumpSharedSpaces) { 590 assert(_info == 0, "_info is initialized only at dump time"); 591 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method() 592 } 593 T tmp; // Allocate temporary dummy metadata object to get to the original vtable. 594 int n = info->vtable_size(); 595 intptr_t* srcvtable = vtable_of(tmp); 596 intptr_t* dstvtable = info->cloned_vtable(); 597 598 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are 599 // safe to do memcpy. 600 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name); 601 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n); 602 return dstvtable + n; 603} 604 605// To determine the size of the vtable for each type, we use the following 606// trick by declaring 2 subclasses: 607// 608// class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} }; 609// class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; }; 610// 611// CppVtableTesterA and CppVtableTesterB's vtables have the following properties: 612// - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N) 613// - The first N entries have are exactly the same as in InstanceKlass's vtable. 614// - Their last entry is different. 615// 616// So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables 617// and find the first entry that's different. 618// 619// This works on all C++ compilers supported by Oracle, but you may need to tweak it for more 620// esoteric compilers. 621 622template <class T> class CppVtableTesterB: public T { 623public: 624 virtual int last_virtual_method() {return 1;} 625}; 626 627template <class T> class CppVtableTesterA : public T { 628public: 629 virtual void* last_virtual_method() { 630 // Make this different than CppVtableTesterB::last_virtual_method so the C++ 631 // compiler/linker won't alias the two functions. 632 return NULL; 633 } 634}; 635 636template <class T> 637int CppVtableCloner<T>::get_vtable_length(const char* name) { 638 CppVtableTesterA<T> a; 639 CppVtableTesterB<T> b; 640 641 intptr_t* avtable = vtable_of(a); 642 intptr_t* bvtable = vtable_of(b); 643 644 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc) 645 int vtable_len = 1; 646 for (; ; vtable_len++) { 647 if (avtable[vtable_len] != bvtable[vtable_len]) { 648 break; 649 } 650 } 651 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name); 652 653 return vtable_len; 654} 655 656#define ALLOC_CPP_VTABLE_CLONE(c) \ 657 CppVtableCloner<c>::allocate(#c); 658 659#define CLONE_CPP_VTABLE(c) \ 660 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p); 661 662#define ZERO_CPP_VTABLE(c) \ 663 CppVtableCloner<c>::zero_vtable_clone(); 664 665// This can be called at both dump time and run time. 666intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) { 667 assert(DumpSharedSpaces || UseSharedSpaces, "sanity"); 668 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE); 669 return p; 670} 671 672void MetaspaceShared::zero_cpp_vtable_clones_for_writing() { 673 assert(DumpSharedSpaces, "dump-time only"); 674 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE); 675} 676 677// Allocate and initialize the C++ vtables, starting from top, but do not go past end. 678void MetaspaceShared::allocate_cpp_vtable_clones() { 679 assert(DumpSharedSpaces, "dump-time only"); 680 // Layout (each slot is a intptr_t): 681 // [number of slots in the first vtable = n1] 682 // [ <n1> slots for the first vtable] 683 // [number of slots in the first second = n2] 684 // [ <n2> slots for the second vtable] 685 // ... 686 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro. 687 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE); 688} 689 690// Switch the vtable pointer to point to the cloned vtable. We assume the 691// vtable pointer is in first slot in object. 692void MetaspaceShared::patch_cpp_vtable_pointers() { 693 int n = _global_klass_objects->length(); 694 for (int i = 0; i < n; i++) { 695 Klass* obj = _global_klass_objects->at(i); 696 if (obj->is_instance_klass()) { 697 InstanceKlass* ik = InstanceKlass::cast(obj); 698 if (ik->is_class_loader_instance_klass()) { 699 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik); 700 } else if (ik->is_reference_instance_klass()) { 701 CppVtableCloner<InstanceRefKlass>::patch(ik); 702 } else if (ik->is_mirror_instance_klass()) { 703 CppVtableCloner<InstanceMirrorKlass>::patch(ik); 704 } else { 705 CppVtableCloner<InstanceKlass>::patch(ik); 706 } 707 ConstantPool* cp = ik->constants(); 708 CppVtableCloner<ConstantPool>::patch(cp); 709 for (int j = 0; j < ik->methods()->length(); j++) { 710 Method* m = ik->methods()->at(j); 711 CppVtableCloner<Method>::patch(m); 712 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be"); 713 } 714 } else if (obj->is_objArray_klass()) { 715 CppVtableCloner<ObjArrayKlass>::patch(obj); 716 } else { 717 assert(obj->is_typeArray_klass(), "sanity"); 718 CppVtableCloner<TypeArrayKlass>::patch(obj); 719 } 720 } 721} 722 723bool MetaspaceShared::is_valid_shared_method(const Method* m) { 724 assert(is_in_shared_space(m), "must be"); 725 return CppVtableCloner<Method>::is_valid_shared_object(m); 726} 727 728// Closure for serializing initialization data out to a data area to be 729// written to the shared file. 730 731class WriteClosure : public SerializeClosure { 732private: 733 DumpRegion* _dump_region; 734 735public: 736 WriteClosure(DumpRegion* r) { 737 _dump_region = r; 738 } 739 740 void do_ptr(void** p) { 741 _dump_region->append_intptr_t((intptr_t)*p); 742 } 743 744 void do_u4(u4* p) { 745 void* ptr = (void*)(uintx(*p)); 746 do_ptr(&ptr); 747 } 748 749 void do_tag(int tag) { 750 _dump_region->append_intptr_t((intptr_t)tag); 751 } 752 753 void do_region(u_char* start, size_t size) { 754 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 755 assert(size % sizeof(intptr_t) == 0, "bad size"); 756 do_tag((int)size); 757 while (size > 0) { 758 _dump_region->append_intptr_t(*(intptr_t*)start); 759 start += sizeof(intptr_t); 760 size -= sizeof(intptr_t); 761 } 762 } 763 764 bool reading() const { return false; } 765}; 766 767// This is for dumping detailed statistics for the allocations 768// in the shared spaces. 769class DumpAllocStats : public ResourceObj { 770public: 771 772 // Here's poor man's enum inheritance 773#define SHAREDSPACE_OBJ_TYPES_DO(f) \ 774 METASPACE_OBJ_TYPES_DO(f) \ 775 f(SymbolHashentry) \ 776 f(SymbolBucket) \ 777 f(StringHashentry) \ 778 f(StringBucket) \ 779 f(Other) 780 781 enum Type { 782 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 783 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 784 _number_of_types 785 }; 786 787 static const char * type_name(Type type) { 788 switch(type) { 789 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 790 default: 791 ShouldNotReachHere(); 792 return NULL; 793 } 794 } 795 796public: 797 enum { RO = 0, RW = 1 }; 798 799 int _counts[2][_number_of_types]; 800 int _bytes [2][_number_of_types]; 801 802 DumpAllocStats() { 803 memset(_counts, 0, sizeof(_counts)); 804 memset(_bytes, 0, sizeof(_bytes)); 805 }; 806 807 void record(MetaspaceObj::Type type, int byte_size, bool read_only) { 808 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 809 int which = (read_only) ? RO : RW; 810 _counts[which][type] ++; 811 _bytes [which][type] += byte_size; 812 } 813 814 void record_other_type(int byte_size, bool read_only) { 815 int which = (read_only) ? RO : RW; 816 _bytes [which][OtherType] += byte_size; 817 } 818 void print_stats(int ro_all, int rw_all, int mc_all, int md_all); 819}; 820 821void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) { 822 // Calculate size of data that was not allocated by Metaspace::allocate() 823 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 824 825 // symbols 826 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count; 827 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes; 828 829 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count; 830 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes; 831 832 // strings 833 _counts[RO][StringHashentryType] = stats->string.hashentry_count; 834 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes; 835 836 _counts[RO][StringBucketType] = stats->string.bucket_count; 837 _bytes [RO][StringBucketType] = stats->string.bucket_bytes; 838 839 // TODO: count things like dictionary, vtable, etc 840 _bytes[RW][OtherType] += mc_all + md_all; 841 rw_all += mc_all + md_all; // mc/md are mapped Read/Write 842 843 // prevent divide-by-zero 844 if (ro_all < 1) { 845 ro_all = 1; 846 } 847 if (rw_all < 1) { 848 rw_all = 1; 849 } 850 851 int all_ro_count = 0; 852 int all_ro_bytes = 0; 853 int all_rw_count = 0; 854 int all_rw_bytes = 0; 855 856// To make fmt_stats be a syntactic constant (for format warnings), use #define. 857#define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 858 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 859 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 860 861 ResourceMark rm; 862 LogMessage(cds) msg; 863 stringStream info_stream; 864 865 info_stream.print_cr("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):"); 866 info_stream.print_cr("%s", hdr); 867 info_stream.print_cr("%s", sep); 868 for (int type = 0; type < int(_number_of_types); type ++) { 869 const char *name = type_name((Type)type); 870 int ro_count = _counts[RO][type]; 871 int ro_bytes = _bytes [RO][type]; 872 int rw_count = _counts[RW][type]; 873 int rw_bytes = _bytes [RW][type]; 874 int count = ro_count + rw_count; 875 int bytes = ro_bytes + rw_bytes; 876 877 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all); 878 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all); 879 double perc = 100.0 * double(bytes) / double(ro_all + rw_all); 880 881 info_stream.print_cr(fmt_stats, name, 882 ro_count, ro_bytes, ro_perc, 883 rw_count, rw_bytes, rw_perc, 884 count, bytes, perc); 885 886 all_ro_count += ro_count; 887 all_ro_bytes += ro_bytes; 888 all_rw_count += rw_count; 889 all_rw_bytes += rw_bytes; 890 } 891 892 int all_count = all_ro_count + all_rw_count; 893 int all_bytes = all_ro_bytes + all_rw_bytes; 894 895 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all); 896 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all); 897 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all); 898 899 info_stream.print_cr("%s", sep); 900 info_stream.print_cr(fmt_stats, "Total", 901 all_ro_count, all_ro_bytes, all_ro_perc, 902 all_rw_count, all_rw_bytes, all_rw_perc, 903 all_count, all_bytes, all_perc); 904 905 assert(all_ro_bytes == ro_all, "everything should have been counted"); 906 assert(all_rw_bytes == rw_all, "everything should have been counted"); 907 908 msg.info("%s", info_stream.as_string()); 909#undef fmt_stats 910} 911 912// Populate the shared space. 913 914class VM_PopulateDumpSharedSpace: public VM_Operation { 915private: 916 GrowableArray<MemRegion> *_string_regions; 917 GrowableArray<MemRegion> *_open_archive_heap_regions; 918 919 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN; 920 void dump_symbols(); 921 char* dump_read_only_tables(); 922 void print_region_stats(); 923 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 924 const char *name, const size_t total_size); 925public: 926 927 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 928 void doit(); // outline because gdb sucks 929 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec); 930}; // class VM_PopulateDumpSharedSpace 931 932class SortedSymbolClosure: public SymbolClosure { 933 GrowableArray<Symbol*> _symbols; 934 virtual void do_symbol(Symbol** sym) { 935 assert((*sym)->is_permanent(), "archived symbols must be permanent"); 936 _symbols.append(*sym); 937 } 938 static int compare_symbols_by_address(Symbol** a, Symbol** b) { 939 if (a[0] < b[0]) { 940 return -1; 941 } else if (a[0] == b[0]) { 942 return 0; 943 } else { 944 return 1; 945 } 946 } 947 948public: 949 SortedSymbolClosure() { 950 SymbolTable::symbols_do(this); 951 _symbols.sort(compare_symbols_by_address); 952 } 953 GrowableArray<Symbol*>* get_sorted_symbols() { 954 return &_symbols; 955 } 956}; 957 958// ArchiveCompactor -- 959// 960// This class is the central piece of shared archive compaction -- all metaspace data are 961// initially allocated outside of the shared regions. ArchiveCompactor copies the 962// metaspace data into their final location in the shared regions. 963 964class ArchiveCompactor : AllStatic { 965 static DumpAllocStats* _alloc_stats; 966 static SortedSymbolClosure* _ssc; 967 968 static unsigned my_hash(const address& a) { 969 return primitive_hash<address>(a); 970 } 971 static bool my_equals(const address& a0, const address& a1) { 972 return primitive_equals<address>(a0, a1); 973 } 974 typedef ResourceHashtable< 975 address, address, 976 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address> 977 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address> 978 16384, ResourceObj::C_HEAP> RelocationTable; 979 static RelocationTable* _new_loc_table; 980 981public: 982 static void initialize() { 983 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats; 984 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable; 985 } 986 static DumpAllocStats* alloc_stats() { 987 return _alloc_stats; 988 } 989 990 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) { 991 address obj = ref->obj(); 992 int bytes = ref->size() * BytesPerWord; 993 char* p; 994 size_t alignment = BytesPerWord; 995 char* oldtop; 996 char* newtop; 997 998 if (read_only) { 999 oldtop = _ro_region.top(); 1000 p = _ro_region.allocate(bytes, alignment); 1001 newtop = _ro_region.top(); 1002 } else { 1003 oldtop = _rw_region.top(); 1004 p = _rw_region.allocate(bytes, alignment); 1005 newtop = _rw_region.top(); 1006 } 1007 memcpy(p, obj, bytes); 1008 bool isnew = _new_loc_table->put(obj, (address)p); 1009 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes); 1010 assert(isnew, "must be"); 1011 1012 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only); 1013 if (ref->msotype() == MetaspaceObj::SymbolType) { 1014 uintx delta = MetaspaceShared::object_delta(p); 1015 if (delta > MAX_SHARED_DELTA) { 1016 // This is just a sanity check and should not appear in any real world usage. This 1017 // happens only if you allocate more than 2GB of Symbols and would require 1018 // millions of shared classes. 1019 vm_exit_during_initialization("Too many Symbols in the CDS archive", 1020 "Please reduce the number of shared classes."); 1021 } 1022 } 1023 } 1024 1025 static address get_new_loc(MetaspaceClosure::Ref* ref) { 1026 address* pp = _new_loc_table->get(ref->obj()); 1027 assert(pp != NULL, "must be"); 1028 return *pp; 1029 } 1030 1031private: 1032 // Makes a shallow copy of visited MetaspaceObj's 1033 class ShallowCopier: public UniqueMetaspaceClosure { 1034 bool _read_only; 1035 public: 1036 ShallowCopier(bool read_only) : _read_only(read_only) {} 1037 1038 virtual void do_unique_ref(Ref* ref, bool read_only) { 1039 if (read_only == _read_only) { 1040 allocate(ref, read_only); 1041 } 1042 } 1043 }; 1044 1045 // Relocate embedded pointers within a MetaspaceObj's shallow copy 1046 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure { 1047 public: 1048 virtual void do_unique_ref(Ref* ref, bool read_only) { 1049 address new_loc = get_new_loc(ref); 1050 RefRelocator refer; 1051 ref->metaspace_pointers_do_at(&refer, new_loc); 1052 } 1053 }; 1054 1055 // Relocate a reference to point to its shallow copy 1056 class RefRelocator: public MetaspaceClosure { 1057 public: 1058 virtual bool do_ref(Ref* ref, bool read_only) { 1059 if (ref->not_null()) { 1060 ref->update(get_new_loc(ref)); 1061 } 1062 return false; // Do not recurse. 1063 } 1064 }; 1065 1066#ifdef ASSERT 1067 class IsRefInArchiveChecker: public MetaspaceClosure { 1068 public: 1069 virtual bool do_ref(Ref* ref, bool read_only) { 1070 if (ref->not_null()) { 1071 char* obj = (char*)ref->obj(); 1072 assert(_ro_region.contains(obj) || _rw_region.contains(obj), 1073 "must be relocated to point to CDS archive"); 1074 } 1075 return false; // Do not recurse. 1076 } 1077 }; 1078#endif 1079 1080public: 1081 static void copy_and_compact() { 1082 // We should no longer allocate anything from the metaspace, so that 1083 // we can have a stable set of MetaspaceObjs to work with. 1084 Metaspace::freeze(); 1085 1086 ResourceMark rm; 1087 SortedSymbolClosure the_ssc; // StackObj 1088 _ssc = &the_ssc; 1089 1090 tty->print_cr("Scanning all metaspace objects ... "); 1091 { 1092 // allocate and shallow-copy RW objects, immediately following the MC region 1093 tty->print_cr("Allocating RW objects ... "); 1094 _mc_region.pack(&_rw_region); 1095 1096 ResourceMark rm; 1097 ShallowCopier rw_copier(false); 1098 iterate_roots(&rw_copier); 1099 } 1100 { 1101 // allocate and shallow-copy of RO object, immediately following the RW region 1102 tty->print_cr("Allocating RO objects ... "); 1103 _rw_region.pack(&_ro_region); 1104 1105 ResourceMark rm; 1106 ShallowCopier ro_copier(true); 1107 iterate_roots(&ro_copier); 1108 } 1109 { 1110 tty->print_cr("Relocating embedded pointers ... "); 1111 ResourceMark rm; 1112 ShallowCopyEmbeddedRefRelocator emb_reloc; 1113 iterate_roots(&emb_reloc); 1114 } 1115 { 1116 tty->print_cr("Relocating external roots ... "); 1117 ResourceMark rm; 1118 RefRelocator ext_reloc; 1119 iterate_roots(&ext_reloc); 1120 } 1121 1122#ifdef ASSERT 1123 { 1124 tty->print_cr("Verifying external roots ... "); 1125 ResourceMark rm; 1126 IsRefInArchiveChecker checker; 1127 iterate_roots(&checker); 1128 } 1129#endif 1130 1131 1132 // cleanup 1133 _ssc = NULL; 1134 } 1135 1136 // We must relocate the System::_well_known_klasses only after we have copied the 1137 // java objects in during dump_java_heap_objects(): during the object copy, we operate on 1138 // old objects which assert that their klass is the original klass. 1139 static void relocate_well_known_klasses() { 1140 { 1141 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... "); 1142 ResourceMark rm; 1143 RefRelocator ext_reloc; 1144 SystemDictionary::well_known_klasses_do(&ext_reloc); 1145 } 1146 // NOTE: after this point, we shouldn't have any globals that can reach the old 1147 // objects. 1148 1149 // We cannot use any of the objects in the heap anymore (except for the objects 1150 // in the CDS shared string regions) because their headers no longer point to 1151 // valid Klasses. 1152 } 1153 1154 static void iterate_roots(MetaspaceClosure* it) { 1155 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols(); 1156 for (int i=0; i<symbols->length(); i++) { 1157 it->push(symbols->adr_at(i)); 1158 } 1159 if (_global_klass_objects != NULL) { 1160 // Need to fix up the pointers 1161 for (int i = 0; i < _global_klass_objects->length(); i++) { 1162 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed. 1163 it->push(_global_klass_objects->adr_at(i)); 1164 } 1165 } 1166 FileMapInfo::metaspace_pointers_do(it); 1167 SystemDictionary::classes_do(it); 1168 Universe::metaspace_pointers_do(it); 1169 SymbolTable::metaspace_pointers_do(it); 1170 vmSymbols::metaspace_pointers_do(it); 1171 } 1172 1173 static Klass* get_relocated_klass(Klass* orig_klass) { 1174 address* pp = _new_loc_table->get((address)orig_klass); 1175 assert(pp != NULL, "must be"); 1176 Klass* klass = (Klass*)(*pp); 1177 assert(klass->is_klass(), "must be"); 1178 return klass; 1179 } 1180}; 1181 1182DumpAllocStats* ArchiveCompactor::_alloc_stats; 1183SortedSymbolClosure* ArchiveCompactor::_ssc; 1184ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table; 1185 1186void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx, 1187 DumpRegion* dump_region, bool read_only, bool allow_exec) { 1188 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec); 1189} 1190 1191void VM_PopulateDumpSharedSpace::dump_symbols() { 1192 tty->print_cr("Dumping symbol table ..."); 1193 1194 NOT_PRODUCT(SymbolTable::verify()); 1195 SymbolTable::write_to_archive(); 1196} 1197 1198char* VM_PopulateDumpSharedSpace::dump_read_only_tables() { 1199 char* oldtop = _ro_region.top(); 1200 // Reorder the system dictionary. Moving the symbols affects 1201 // how the hash table indices are calculated. 1202 SystemDictionary::reorder_dictionary_for_sharing(); 1203 tty->print("Removing java_mirror ... "); 1204 remove_java_mirror_in_classes(); 1205 tty->print_cr("done. "); 1206 NOT_PRODUCT(SystemDictionary::verify();) 1207 1208 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets(); 1209 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t)); 1210 SystemDictionary::copy_buckets(buckets_top, _ro_region.top()); 1211 1212 size_t table_bytes = SystemDictionary::count_bytes_for_table(); 1213 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t)); 1214 SystemDictionary::copy_table(table_top, _ro_region.top()); 1215 1216 // Write the other data to the output array. 1217 WriteClosure wc(&_ro_region); 1218 MetaspaceShared::serialize(&wc); 1219 1220 char* newtop = _ro_region.top(); 1221 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true); 1222 return buckets_top; 1223} 1224 1225void VM_PopulateDumpSharedSpace::doit() { 1226 Thread* THREAD = VMThread::vm_thread(); 1227 1228 NOT_PRODUCT(SystemDictionary::verify();) 1229 // The following guarantee is meant to ensure that no loader constraints 1230 // exist yet, since the constraints table is not shared. This becomes 1231 // more important now that we don't re-initialize vtables/itables for 1232 // shared classes at runtime, where constraints were previously created. 1233 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 1234 "loader constraints are not saved"); 1235 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 1236 "placeholders are not saved"); 1237 // Revisit and implement this if we prelink method handle call sites: 1238 guarantee(SystemDictionary::invoke_method_table() == NULL || 1239 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 1240 "invoke method table is not saved"); 1241 1242 // At this point, many classes have been loaded. 1243 // Gather systemDictionary classes in a global array and do everything to 1244 // that so we don't have to walk the SystemDictionary again. 1245 _global_klass_objects = new GrowableArray<Klass*>(1000); 1246 CollectClassesClosure collect_classes; 1247 ClassLoaderDataGraph::loaded_classes_do(&collect_classes); 1248 1249 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 1250 { 1251 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 1252 for (int i = 0; i < _global_klass_objects->length(); i++) { 1253 Klass* k = _global_klass_objects->at(i); 1254 if (k->is_instance_klass()) { 1255 num_inst ++; 1256 } else if (k->is_objArray_klass()) { 1257 num_obj_array ++; 1258 } else { 1259 assert(k->is_typeArray_klass(), "sanity"); 1260 num_type_array ++; 1261 } 1262 } 1263 tty->print_cr(" instance classes = %5d", num_inst); 1264 tty->print_cr(" obj array classes = %5d", num_obj_array); 1265 tty->print_cr(" type array classes = %5d", num_type_array); 1266 } 1267 1268 // Ensure the ConstMethods won't be modified at run-time 1269 tty->print("Updating ConstMethods ... "); 1270 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 1271 tty->print_cr("done. "); 1272 1273 // Move classes from platform/system dictionaries into the boot dictionary 1274 SystemDictionary::combine_shared_dictionaries(); 1275 1276 // Remove all references outside the metadata 1277 tty->print("Removing unshareable information ... "); 1278 remove_unshareable_in_classes(); 1279 tty->print_cr("done. "); 1280 1281 // We don't support archiving anonymous classes. Verify that they are not stored in 1282 // the any dictionaries. 1283 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries()); 1284 1285 SystemDictionaryShared::finalize_verification_constraints(); 1286 1287 ArchiveCompactor::initialize(); 1288 ArchiveCompactor::copy_and_compact(); 1289 1290 dump_symbols(); 1291 1292 // Dump supported java heap objects 1293 _string_regions = NULL; 1294 _open_archive_heap_regions = NULL; 1295 dump_java_heap_objects(); 1296 1297 ArchiveCompactor::relocate_well_known_klasses(); 1298 1299 char* read_only_tables_start = dump_read_only_tables(); 1300 _ro_region.pack(&_md_region); 1301 1302 char* vtbl_list = _md_region.top(); 1303 MetaspaceShared::allocate_cpp_vtable_clones(); 1304 _md_region.pack(&_od_region); 1305 1306 // Relocate the archived class file data into the od region 1307 relocate_cached_class_file(); 1308 _od_region.pack(); 1309 1310 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size 1311 // is just the spaces between the two ends. 1312 size_t core_spaces_size = _od_region.end() - _mc_region.base(); 1313 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()), 1314 "should already be aligned"); 1315 1316 // During patching, some virtual methods may be called, so at this point 1317 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate). 1318 MetaspaceShared::patch_cpp_vtable_pointers(); 1319 1320 // The vtable clones contain addresses of the current process. 1321 // We don't want to write these addresses into the archive. 1322 MetaspaceShared::zero_cpp_vtable_clones_for_writing(); 1323 1324 // Create and write the archive file that maps the shared spaces. 1325 1326 FileMapInfo* mapinfo = new FileMapInfo(); 1327 mapinfo->populate_header(os::vm_allocation_granularity()); 1328 mapinfo->set_read_only_tables_start(read_only_tables_start); 1329 mapinfo->set_misc_data_patching_start(vtbl_list); 1330 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers()); 1331 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size()); 1332 mapinfo->set_core_spaces_size(core_spaces_size); 1333 1334 for (int pass=1; pass<=2; pass++) { 1335 if (pass == 1) { 1336 // The first pass doesn't actually write the data to disk. All it 1337 // does is to update the fields in the mapinfo->_header. 1338 } else { 1339 // After the first pass, the contents of mapinfo->_header are finalized, 1340 // so we can compute the header's CRC, and write the contents of the header 1341 // and the regions into disk. 1342 mapinfo->open_for_write(); 1343 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 1344 } 1345 mapinfo->write_header(); 1346 1347 // NOTE: md contains the trampoline code for method entries, which are patched at run time, 1348 // so it needs to be read/write. 1349 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true); 1350 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false); 1351 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false); 1352 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false); 1353 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false); 1354 1355 _total_string_region_size = mapinfo->write_archive_heap_regions( 1356 _string_regions, 1357 MetaspaceShared::first_string, 1358 MetaspaceShared::max_strings); 1359 _total_open_archive_region_size = mapinfo->write_archive_heap_regions( 1360 _open_archive_heap_regions, 1361 MetaspaceShared::first_open_archive_heap_region, 1362 MetaspaceShared::max_open_archive_heap_region); 1363 } 1364 1365 mapinfo->close(); 1366 1367 // Restore the vtable in case we invoke any virtual methods. 1368 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list); 1369 1370 print_region_stats(); 1371 1372 if (log_is_enabled(Info, cds)) { 1373 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()), 1374 int(_mc_region.used()), int(_md_region.used())); 1375 } 1376 1377 if (PrintSystemDictionaryAtExit) { 1378 SystemDictionary::print(); 1379 } 1380 // There may be other pending VM operations that operate on the InstanceKlasses, 1381 // which will fail because InstanceKlasses::remove_unshareable_info() 1382 // has been called. Forget these operations and exit the VM directly. 1383 vm_direct_exit(0); 1384} 1385 1386void VM_PopulateDumpSharedSpace::print_region_stats() { 1387 // Print statistics of all the regions 1388 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() + 1389 _mc_region.reserved() + _md_region.reserved() + 1390 _od_region.reserved() + 1391 _total_string_region_size + 1392 _total_open_archive_region_size; 1393 const size_t total_bytes = _ro_region.used() + _rw_region.used() + 1394 _mc_region.used() + _md_region.used() + 1395 _od_region.used() + 1396 _total_string_region_size + 1397 _total_open_archive_region_size; 1398 const double total_u_perc = total_bytes / double(total_reserved) * 100.0; 1399 1400 _mc_region.print(total_reserved); 1401 _rw_region.print(total_reserved); 1402 _ro_region.print(total_reserved); 1403 _md_region.print(total_reserved); 1404 _od_region.print(total_reserved); 1405 print_heap_region_stats(_string_regions, "st", total_reserved); 1406 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved); 1407 1408 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]", 1409 total_bytes, total_reserved, total_u_perc); 1410} 1411 1412void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1413 const char *name, const size_t total_size) { 1414 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 1415 for (int i = 0; i < arr_len; i++) { 1416 char* start = (char*)heap_mem->at(i).start(); 1417 size_t size = heap_mem->at(i).byte_size(); 1418 char* top = start + size; 1419 tty->print_cr("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100%% used] at " INTPTR_FORMAT, 1420 name, i, size, size/double(total_size)*100.0, size, p2i(start)); 1421 1422 } 1423} 1424 1425// Update a Java object to point its Klass* to the new location after 1426// shared archive has been compacted. 1427void MetaspaceShared::relocate_klass_ptr(oop o) { 1428 assert(DumpSharedSpaces, "sanity"); 1429 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass()); 1430 o->set_klass(k); 1431} 1432 1433class LinkSharedClassesClosure : public KlassClosure { 1434 Thread* THREAD; 1435 bool _made_progress; 1436 public: 1437 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {} 1438 1439 void reset() { _made_progress = false; } 1440 bool made_progress() const { return _made_progress; } 1441 1442 void do_klass(Klass* k) { 1443 if (k->is_instance_klass()) { 1444 InstanceKlass* ik = InstanceKlass::cast(k); 1445 // Link the class to cause the bytecodes to be rewritten and the 1446 // cpcache to be created. Class verification is done according 1447 // to -Xverify setting. 1448 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD); 1449 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1450 1451 ik->constants()->resolve_class_constants(THREAD); 1452 } 1453 } 1454}; 1455 1456class CheckSharedClassesClosure : public KlassClosure { 1457 bool _made_progress; 1458 public: 1459 CheckSharedClassesClosure() : _made_progress(false) {} 1460 1461 void reset() { _made_progress = false; } 1462 bool made_progress() const { return _made_progress; } 1463 void do_klass(Klass* k) { 1464 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) { 1465 _made_progress = true; 1466 } 1467 } 1468}; 1469 1470void MetaspaceShared::check_shared_class_loader_type(Klass* k) { 1471 if (k->is_instance_klass()) { 1472 InstanceKlass* ik = InstanceKlass::cast(k); 1473 u2 loader_type = ik->loader_type(); 1474 ResourceMark rm; 1475 guarantee(loader_type != 0, 1476 "Class loader type is not set for this class %s", ik->name()->as_C_string()); 1477 } 1478} 1479 1480void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 1481 // We need to iterate because verification may cause additional classes 1482 // to be loaded. 1483 LinkSharedClassesClosure link_closure(THREAD); 1484 do { 1485 link_closure.reset(); 1486 ClassLoaderDataGraph::loaded_classes_do(&link_closure); 1487 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1488 } while (link_closure.made_progress()); 1489 1490 if (_has_error_classes) { 1491 // Mark all classes whose super class or interfaces failed verification. 1492 CheckSharedClassesClosure check_closure; 1493 do { 1494 // Not completely sure if we need to do this iteratively. Anyway, 1495 // we should come here only if there are unverifiable classes, which 1496 // shouldn't happen in normal cases. So better safe than sorry. 1497 check_closure.reset(); 1498 ClassLoaderDataGraph::loaded_classes_do(&check_closure); 1499 } while (check_closure.made_progress()); 1500 1501 if (IgnoreUnverifiableClassesDuringDump) { 1502 // This is useful when running JCK or SQE tests. You should not 1503 // enable this when running real apps. 1504 SystemDictionary::remove_classes_in_error_state(); 1505 } else { 1506 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 1507 exit(1); 1508 } 1509 } 1510} 1511 1512void MetaspaceShared::prepare_for_dumping() { 1513 Arguments::check_unsupported_dumping_properties(); 1514 ClassLoader::initialize_shared_path(); 1515 FileMapInfo::allocate_classpath_entry_table(); 1516} 1517 1518// Preload classes from a list, populate the shared spaces and dump to a 1519// file. 1520void MetaspaceShared::preload_and_dump(TRAPS) { 1521 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime)); 1522 ResourceMark rm; 1523 char class_list_path_str[JVM_MAXPATHLEN]; 1524 // Preload classes to be shared. 1525 // Should use some os:: method rather than fopen() here. aB. 1526 const char* class_list_path; 1527 if (SharedClassListFile == NULL) { 1528 // Construct the path to the class list (in jre/lib) 1529 // Walk up two directories from the location of the VM and 1530 // optionally tack on "lib" (depending on platform) 1531 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 1532 for (int i = 0; i < 3; i++) { 1533 char *end = strrchr(class_list_path_str, *os::file_separator()); 1534 if (end != NULL) *end = '\0'; 1535 } 1536 int class_list_path_len = (int)strlen(class_list_path_str); 1537 if (class_list_path_len >= 3) { 1538 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 1539 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 1540 jio_snprintf(class_list_path_str + class_list_path_len, 1541 sizeof(class_list_path_str) - class_list_path_len, 1542 "%slib", os::file_separator()); 1543 class_list_path_len += 4; 1544 } 1545 } 1546 } 1547 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 1548 jio_snprintf(class_list_path_str + class_list_path_len, 1549 sizeof(class_list_path_str) - class_list_path_len, 1550 "%sclasslist", os::file_separator()); 1551 } 1552 class_list_path = class_list_path_str; 1553 } else { 1554 class_list_path = SharedClassListFile; 1555 } 1556 1557 tty->print_cr("Loading classes to share ..."); 1558 _has_error_classes = false; 1559 int class_count = preload_classes(class_list_path, THREAD); 1560 if (ExtraSharedClassListFile) { 1561 class_count += preload_classes(ExtraSharedClassListFile, THREAD); 1562 } 1563 tty->print_cr("Loading classes to share: done."); 1564 1565 log_info(cds)("Shared spaces: preloaded %d classes", class_count); 1566 1567 // Rewrite and link classes 1568 tty->print_cr("Rewriting and linking classes ..."); 1569 1570 // Link any classes which got missed. This would happen if we have loaded classes that 1571 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 1572 // fails verification, all other interfaces that were not specified in the classlist but 1573 // are implemented by K are not verified. 1574 link_and_cleanup_shared_classes(CATCH); 1575 tty->print_cr("Rewriting and linking classes: done"); 1576 1577 SystemDictionary::clear_invoke_method_table(); 1578 1579 VM_PopulateDumpSharedSpace op; 1580 VMThread::execute(&op); 1581 } 1582} 1583 1584 1585int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) { 1586 ClassListParser parser(class_list_path); 1587 int class_count = 0; 1588 1589 while (parser.parse_one_line()) { 1590 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD); 1591 if (HAS_PENDING_EXCEPTION) { 1592 if (klass == NULL && 1593 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) { 1594 // print a warning only when the pending exception is class not found 1595 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name()); 1596 } 1597 CLEAR_PENDING_EXCEPTION; 1598 } 1599 if (klass != NULL) { 1600 if (log_is_enabled(Trace, cds)) { 1601 ResourceMark rm; 1602 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name()); 1603 } 1604 1605 InstanceKlass* ik = InstanceKlass::cast(klass); 1606 1607 // Link the class to cause the bytecodes to be rewritten and the 1608 // cpcache to be created. The linking is done as soon as classes 1609 // are loaded in order that the related data structures (klass and 1610 // cpCache) are located together. 1611 try_link_class(ik, THREAD); 1612 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1613 1614 class_count++; 1615 } 1616 } 1617 1618 return class_count; 1619} 1620 1621// Returns true if the class's status has changed 1622bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 1623 assert(DumpSharedSpaces, "should only be called during dumping"); 1624 if (ik->init_state() < InstanceKlass::linked) { 1625 bool saved = BytecodeVerificationLocal; 1626 if (!(ik->is_shared_boot_class())) { 1627 // The verification decision is based on BytecodeVerificationRemote 1628 // for non-system classes. Since we are using the NULL classloader 1629 // to load non-system classes during dumping, we need to temporarily 1630 // change BytecodeVerificationLocal to be the same as 1631 // BytecodeVerificationRemote. Note this can cause the parent system 1632 // classes also being verified. The extra overhead is acceptable during 1633 // dumping. 1634 BytecodeVerificationLocal = BytecodeVerificationRemote; 1635 } 1636 ik->link_class(THREAD); 1637 if (HAS_PENDING_EXCEPTION) { 1638 ResourceMark rm; 1639 tty->print_cr("Preload Warning: Verification failed for %s", 1640 ik->external_name()); 1641 CLEAR_PENDING_EXCEPTION; 1642 ik->set_in_error_state(); 1643 _has_error_classes = true; 1644 } 1645 BytecodeVerificationLocal = saved; 1646 return true; 1647 } else { 1648 return false; 1649 } 1650} 1651 1652#if INCLUDE_CDS_JAVA_HEAP 1653void VM_PopulateDumpSharedSpace::dump_java_heap_objects() { 1654 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 1655 if (log_is_enabled(Info, cds)) { 1656 log_info(cds)( 1657 "Archived java heap is not supported as UseG1GC, " 1658 "UseCompressedOops and UseCompressedClassPointers are required." 1659 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.", 1660 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops), 1661 BOOL_TO_STR(UseCompressedClassPointers)); 1662 } 1663 return; 1664 } 1665 1666 { 1667 NoSafepointVerifier nsv; 1668 1669 // Cache for recording where the archived objects are copied to 1670 MetaspaceShared::create_archive_object_cache(); 1671 1672 tty->print_cr("Dumping String objects to closed archive heap region ..."); 1673 NOT_PRODUCT(StringTable::verify()); 1674 // The string space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details. 1675 _string_regions = new GrowableArray<MemRegion>(2); 1676 StringTable::write_to_archive(_string_regions); 1677 1678 tty->print_cr("Dumping objects to open archive heap region ..."); 1679 _open_archive_heap_regions = new GrowableArray<MemRegion>(2); 1680 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions); 1681 1682 MetaspaceShared::destroy_archive_object_cache(); 1683 } 1684 1685 G1HeapVerifier::verify_archive_regions(); 1686} 1687 1688void MetaspaceShared::dump_open_archive_heap_objects( 1689 GrowableArray<MemRegion> * open_archive) { 1690 assert(UseG1GC, "Only support G1 GC"); 1691 assert(UseCompressedOops && UseCompressedClassPointers, 1692 "Only support UseCompressedOops and UseCompressedClassPointers enabled"); 1693 1694 Thread* THREAD = Thread::current(); 1695 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */); 1696 1697 MetaspaceShared::archive_resolved_constants(THREAD); 1698 1699 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive, 1700 os::vm_allocation_granularity()); 1701} 1702 1703MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL; 1704oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) { 1705 assert(DumpSharedSpaces, "dump-time only"); 1706 1707 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache(); 1708 oop* p = cache->get(obj); 1709 if (p != NULL) { 1710 // already archived 1711 return *p; 1712 } 1713 1714 int len = obj->size(); 1715 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) { 1716 return NULL; 1717 } 1718 1719 int hash = obj->identity_hash(); 1720 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len); 1721 if (archived_oop != NULL) { 1722 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len); 1723 relocate_klass_ptr(archived_oop); 1724 cache->put(obj, archived_oop); 1725 } 1726 return archived_oop; 1727} 1728 1729void MetaspaceShared::archive_resolved_constants(Thread* THREAD) { 1730 int i; 1731 for (i = 0; i < _global_klass_objects->length(); i++) { 1732 Klass* k = _global_klass_objects->at(i); 1733 if (k->is_instance_klass()) { 1734 InstanceKlass* ik = InstanceKlass::cast(k); 1735 ik->constants()->archive_resolved_references(THREAD); 1736 } 1737 } 1738} 1739 1740void MetaspaceShared::fixup_mapped_heap_regions() { 1741 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1742 mapinfo->fixup_mapped_heap_regions(); 1743} 1744#endif // INCLUDE_CDS_JAVA_HEAP 1745 1746// Closure for serializing initialization data in from a data area 1747// (ptr_array) read from the shared file. 1748 1749class ReadClosure : public SerializeClosure { 1750private: 1751 intptr_t** _ptr_array; 1752 1753 inline intptr_t nextPtr() { 1754 return *(*_ptr_array)++; 1755 } 1756 1757public: 1758 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 1759 1760 void do_ptr(void** p) { 1761 assert(*p == NULL, "initializing previous initialized pointer."); 1762 intptr_t obj = nextPtr(); 1763 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 1764 "hit tag while initializing ptrs."); 1765 *p = (void*)obj; 1766 } 1767 1768 void do_u4(u4* p) { 1769 intptr_t obj = nextPtr(); 1770 *p = (u4)(uintx(obj)); 1771 } 1772 1773 void do_tag(int tag) { 1774 int old_tag; 1775 old_tag = (int)(intptr_t)nextPtr(); 1776 // do_int(&old_tag); 1777 assert(tag == old_tag, "old tag doesn't match"); 1778 FileMapInfo::assert_mark(tag == old_tag); 1779 } 1780 1781 void do_region(u_char* start, size_t size) { 1782 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 1783 assert(size % sizeof(intptr_t) == 0, "bad size"); 1784 do_tag((int)size); 1785 while (size > 0) { 1786 *(intptr_t*)start = nextPtr(); 1787 start += sizeof(intptr_t); 1788 size -= sizeof(intptr_t); 1789 } 1790 } 1791 1792 bool reading() const { return true; } 1793}; 1794 1795// Return true if given address is in the mapped shared space. 1796bool MetaspaceShared::is_in_shared_space(const void* p) { 1797 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p); 1798} 1799 1800// Return true if given address is in the misc data region 1801bool MetaspaceShared::is_in_shared_region(const void* p, int idx) { 1802 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx); 1803} 1804 1805bool MetaspaceShared::is_in_trampoline_frame(address addr) { 1806 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) { 1807 return true; 1808 } 1809 return false; 1810} 1811 1812void MetaspaceShared::print_shared_spaces() { 1813 if (UseSharedSpaces) { 1814 FileMapInfo::current_info()->print_shared_spaces(); 1815 } 1816} 1817 1818 1819// Map shared spaces at requested addresses and return if succeeded. 1820bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 1821 size_t image_alignment = mapinfo->alignment(); 1822 1823#ifndef _WINDOWS 1824 // Map in the shared memory and then map the regions on top of it. 1825 // On Windows, don't map the memory here because it will cause the 1826 // mappings of the regions to fail. 1827 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 1828 if (!shared_rs.is_reserved()) return false; 1829#endif 1830 1831 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 1832 1833 char* _ro_base = NULL; 1834 char* _rw_base = NULL; 1835 char* _mc_base = NULL; 1836 char* _md_base = NULL; 1837 char* _od_base = NULL; 1838 1839 // Map each shared region 1840 if ((_mc_base = mapinfo->map_region(mc)) != NULL && 1841 mapinfo->verify_region_checksum(mc) && 1842 (_rw_base = mapinfo->map_region(rw)) != NULL && 1843 mapinfo->verify_region_checksum(rw) && 1844 (_ro_base = mapinfo->map_region(ro)) != NULL && 1845 mapinfo->verify_region_checksum(ro) && 1846 (_md_base = mapinfo->map_region(md)) != NULL && 1847 mapinfo->verify_region_checksum(md) && 1848 (_od_base = mapinfo->map_region(od)) != NULL && 1849 mapinfo->verify_region_checksum(od) && 1850 (image_alignment == (size_t)os::vm_allocation_granularity()) && 1851 mapinfo->validate_classpath_entry_table()) { 1852 // Success (no need to do anything) 1853 return true; 1854 } else { 1855 // If there was a failure in mapping any of the spaces, unmap the ones 1856 // that succeeded 1857 if (_ro_base != NULL) mapinfo->unmap_region(ro); 1858 if (_rw_base != NULL) mapinfo->unmap_region(rw); 1859 if (_mc_base != NULL) mapinfo->unmap_region(mc); 1860 if (_md_base != NULL) mapinfo->unmap_region(md); 1861 if (_od_base != NULL) mapinfo->unmap_region(od); 1862#ifndef _WINDOWS 1863 // Release the entire mapped region 1864 shared_rs.release(); 1865#endif 1866 // If -Xshare:on is specified, print out the error message and exit VM, 1867 // otherwise, set UseSharedSpaces to false and continue. 1868 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 1869 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 1870 } else { 1871 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1872 } 1873 return false; 1874 } 1875} 1876 1877// Read the miscellaneous data from the shared file, and 1878// serialize it out to its various destinations. 1879 1880void MetaspaceShared::initialize_shared_spaces() { 1881 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1882 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers(); 1883 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size(); 1884 _core_spaces_size = mapinfo->core_spaces_size(); 1885 char* buffer = mapinfo->misc_data_patching_start(); 1886 clone_cpp_vtables((intptr_t*)buffer); 1887 1888 // The rest of the data is now stored in the RW region 1889 buffer = mapinfo->read_only_tables_start(); 1890 int sharedDictionaryLen = *(intptr_t*)buffer; 1891 buffer += sizeof(intptr_t); 1892 int number_of_entries = *(intptr_t*)buffer; 1893 buffer += sizeof(intptr_t); 1894 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 1895 sharedDictionaryLen, 1896 number_of_entries); 1897 buffer += sharedDictionaryLen; 1898 1899 // The following data are the linked list elements 1900 // (HashtableEntry objects) for the shared dictionary table. 1901 1902 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 1903 buffer += sizeof(intptr_t); 1904 buffer += len; 1905 1906 // Verify various attributes of the archive, plus initialize the 1907 // shared string/symbol tables 1908 intptr_t* array = (intptr_t*)buffer; 1909 ReadClosure rc(&array); 1910 serialize(&rc); 1911 1912 // Initialize the run-time symbol table. 1913 SymbolTable::create_table(); 1914 1915 // Close the mapinfo file 1916 mapinfo->close(); 1917 1918 if (PrintSharedArchiveAndExit) { 1919 if (PrintSharedDictionary) { 1920 tty->print_cr("\nShared classes:\n"); 1921 SystemDictionary::print_shared(tty); 1922 } 1923 if (_archive_loading_failed) { 1924 tty->print_cr("archive is invalid"); 1925 vm_exit(1); 1926 } else { 1927 tty->print_cr("archive is valid"); 1928 vm_exit(0); 1929 } 1930 } 1931} 1932 1933// JVM/TI RedefineClasses() support: 1934bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 1935 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1936 1937 if (UseSharedSpaces) { 1938 // remap the shared readonly space to shared readwrite, private 1939 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1940 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 1941 return false; 1942 } 1943 _remapped_readwrite = true; 1944 } 1945 return true; 1946} 1947 1948void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) { 1949 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space. 1950 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes 1951 // or so. 1952 _mc_region.print_out_of_space_msg(name, needed_bytes); 1953 _rw_region.print_out_of_space_msg(name, needed_bytes); 1954 _ro_region.print_out_of_space_msg(name, needed_bytes); 1955 _md_region.print_out_of_space_msg(name, needed_bytes); 1956 _od_region.print_out_of_space_msg(name, needed_bytes); 1957 1958 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name), 1959 "Please reduce the number of shared classes."); 1960} 1961