1 /* 2 * Copyright (c) 2012, 2015, 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/dictionary.hpp" 27 #include "classfile/loaderConstraints.hpp" 28 #include "classfile/placeholders.hpp" 29 #include "classfile/sharedClassUtil.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "code/codeCache.hpp" 33 #include "gc/shared/gcLocker.hpp" 34 #include "interpreter/bytecodeStream.hpp" 35 #include "interpreter/bytecodes.hpp" 36 #include "memory/filemap.hpp" 37 #include "memory/metaspace.hpp" 38 #include "memory/metaspaceShared.hpp" 39 #include "oops/objArrayOop.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/os.hpp" 42 #include "runtime/signature.hpp" 43 #include "runtime/vmThread.hpp" 44 #include "runtime/vm_operations.hpp" 45 #include "utilities/hashtable.inline.hpp" 46 47 int MetaspaceShared::_max_alignment = 0; 48 49 ReservedSpace* MetaspaceShared::_shared_rs = NULL; 50 51 MetaspaceSharedStats MetaspaceShared::_stats; 52 53 bool MetaspaceShared::_link_classes_made_progress; 54 bool MetaspaceShared::_check_classes_made_progress; 55 bool MetaspaceShared::_has_error_classes; 56 bool MetaspaceShared::_archive_loading_failed = false; 57 // Read/write a data stream for restoring/preserving metadata pointers and 58 // miscellaneous data from/to the shared archive file. 59 60 void MetaspaceShared::serialize(SerializeClosure* soc) { 61 int tag = 0; 62 soc->do_tag(--tag); 63 64 // Verify the sizes of various metadata in the system. 65 soc->do_tag(sizeof(Method)); 66 soc->do_tag(sizeof(ConstMethod)); 67 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); 68 soc->do_tag(sizeof(ConstantPool)); 69 soc->do_tag(sizeof(ConstantPoolCache)); 70 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); 71 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); 72 soc->do_tag(sizeof(Symbol)); 73 74 // Dump/restore miscellaneous metadata. 75 Universe::serialize(soc, true); 76 soc->do_tag(--tag); 77 78 // Dump/restore references to commonly used names and signatures. 79 vmSymbols::serialize(soc); 80 soc->do_tag(--tag); 81 82 soc->do_tag(666); 83 } 84 85 86 // CDS code for dumping shared archive. 87 88 // Global object for holding classes that have been loaded. Since this 89 // is run at a safepoint just before exit, this is the entire set of classes. 90 static GrowableArray<Klass*>* _global_klass_objects; 91 static void collect_classes(Klass* k) { 92 _global_klass_objects->append_if_missing(k); 93 if (k->oop_is_instance()) { 94 // Add in the array classes too 95 InstanceKlass* ik = InstanceKlass::cast(k); 96 ik->array_klasses_do(collect_classes); 97 } 98 } 99 100 static void remove_unshareable_in_classes() { 101 for (int i = 0; i < _global_klass_objects->length(); i++) { 102 Klass* k = _global_klass_objects->at(i); 103 k->remove_unshareable_info(); 104 } 105 } 106 107 static void rewrite_nofast_bytecode(Method* method) { 108 RawBytecodeStream bcs(method); 109 while (!bcs.is_last_bytecode()) { 110 Bytecodes::Code opcode = bcs.raw_next(); 111 switch (opcode) { 112 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 113 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 114 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 115 case Bytecodes::_iload: *bcs.bcp() = Bytecodes::_nofast_iload; break; 116 default: break; 117 } 118 } 119 } 120 121 // Walk all methods in the class list to ensure that they won't be modified at 122 // run time. This includes: 123 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 124 // at run time by RewriteBytecodes/RewriteFrequentPairs 125 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 126 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 127 for (int i = 0; i < _global_klass_objects->length(); i++) { 128 Klass* k = _global_klass_objects->at(i); 129 if (k->oop_is_instance()) { 130 InstanceKlass* ik = InstanceKlass::cast(k); 131 for (int i = 0; i < ik->methods()->length(); i++) { 132 Method* m = ik->methods()->at(i); 133 rewrite_nofast_bytecode(m); 134 Fingerprinter fp(m); 135 // The side effect of this call sets method's fingerprint field. 136 fp.fingerprint(); 137 } 138 } 139 } 140 } 141 142 // Patch C++ vtable pointer in metadata. 143 144 // Klass and other metadata objects contain references to c++ vtables in the 145 // JVM library. 146 // Fix them to point to our constructed vtables. However, don't iterate 147 // across the space while doing this, as that causes the vtables to be 148 // patched, undoing our useful work. Instead, iterate to make a list, 149 // then use the list to do the fixing. 150 // 151 // Our constructed vtables: 152 // Dump time: 153 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs 154 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list 155 // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and 156 // associated metadata to point to jump table rather than to current vtbl 157 // Table layout: NOTE FIXED SIZE 158 // 1. vtbl pointers 159 // 2. #Klass X #virtual methods per Klass 160 // 1 entry for each, in the order: 161 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry 162 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry 163 // ... 164 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry, 165 // ... Klass<vtbl_list_size>:method<num_virtuals> entry 166 // Sample entry: (Sparc): 167 // save(sp, -256, sp) 168 // ba,pt common_code 169 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255) 170 // 171 // Restore time: 172 // 1. initialize_shared_space: reserve space for table 173 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text 174 // 175 // Execution time: 176 // First virtual method call for any object of these metadata types: 177 // 1. object->klass 178 // 2. vtable entry for that klass points to the jump table entries 179 // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index 180 // 4. common_code: 181 // Get address of new vtbl pointer for this Klass from updated table 182 // Update new vtbl pointer in the Klass: future virtual calls go direct 183 // Jump to method, using new vtbl pointer and method index 184 185 186 static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) { 187 void* old_vtbl_ptr = *(void**)obj; 188 for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) { 189 if (vtbl_list[i] == old_vtbl_ptr) { 190 return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals; 191 } 192 } 193 ShouldNotReachHere(); 194 return NULL; 195 } 196 197 // Assumes the vtable is in first slot in object. 198 static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) { 199 int n = _global_klass_objects->length(); 200 for (int i = 0; i < n; i++) { 201 Klass* obj = _global_klass_objects->at(i); 202 // Note oop_is_instance() is a virtual call. After patching vtables 203 // all virtual calls on the dummy vtables will restore the original! 204 if (obj->oop_is_instance()) { 205 InstanceKlass* ik = InstanceKlass::cast(obj); 206 *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik); 207 ConstantPool* cp = ik->constants(); 208 *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp); 209 for (int j = 0; j < ik->methods()->length(); j++) { 210 Method* m = ik->methods()->at(j); 211 *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m); 212 } 213 } else { 214 // Array klasses 215 Klass* k = obj; 216 *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k); 217 } 218 } 219 } 220 221 // Closure for serializing initialization data out to a data area to be 222 // written to the shared file. 223 224 class WriteClosure : public SerializeClosure { 225 private: 226 intptr_t* top; 227 char* end; 228 229 inline void check_space() { 230 if ((char*)top + sizeof(intptr_t) > end) { 231 report_out_of_shared_space(SharedMiscData); 232 } 233 } 234 235 public: 236 WriteClosure(char* md_top, char* md_end) { 237 top = (intptr_t*)md_top; 238 end = md_end; 239 } 240 241 char* get_top() { return (char*)top; } 242 243 void do_ptr(void** p) { 244 check_space(); 245 *top = (intptr_t)*p; 246 ++top; 247 } 248 249 void do_tag(int tag) { 250 check_space(); 251 *top = (intptr_t)tag; 252 ++top; 253 } 254 255 void do_region(u_char* start, size_t size) { 256 if ((char*)top + size > end) { 257 report_out_of_shared_space(SharedMiscData); 258 } 259 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 260 assert(size % sizeof(intptr_t) == 0, "bad size"); 261 do_tag((int)size); 262 while (size > 0) { 263 *top = *(intptr_t*)start; 264 ++top; 265 start += sizeof(intptr_t); 266 size -= sizeof(intptr_t); 267 } 268 } 269 270 bool reading() const { return false; } 271 }; 272 273 // This is for dumping detailed statistics for the allocations 274 // in the shared spaces. 275 class DumpAllocClosure : public Metaspace::AllocRecordClosure { 276 public: 277 278 // Here's poor man's enum inheritance 279 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ 280 METASPACE_OBJ_TYPES_DO(f) \ 281 f(SymbolHashentry) \ 282 f(SymbolBucket) \ 283 f(Other) 284 285 #define SHAREDSPACE_OBJ_TYPE_DECLARE(name) name ## Type, 286 #define SHAREDSPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name; 287 288 enum Type { 289 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 290 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_DECLARE) 291 _number_of_types 292 }; 293 294 static const char * type_name(Type type) { 295 switch(type) { 296 SHAREDSPACE_OBJ_TYPES_DO(SHAREDSPACE_OBJ_TYPE_NAME_CASE) 297 default: 298 ShouldNotReachHere(); 299 return NULL; 300 } 301 } 302 303 public: 304 enum { 305 RO = 0, 306 RW = 1 307 }; 308 309 int _counts[2][_number_of_types]; 310 int _bytes [2][_number_of_types]; 311 int _which; 312 313 DumpAllocClosure() { 314 memset(_counts, 0, sizeof(_counts)); 315 memset(_bytes, 0, sizeof(_bytes)); 316 }; 317 318 void iterate_metaspace(Metaspace* space, int which) { 319 assert(which == RO || which == RW, "sanity"); 320 _which = which; 321 space->iterate(this); 322 } 323 324 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) { 325 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 326 _counts[_which][type] ++; 327 _bytes [_which][type] += byte_size; 328 } 329 330 void dump_stats(int ro_all, int rw_all, int md_all, int mc_all); 331 }; 332 333 void DumpAllocClosure::dump_stats(int ro_all, int rw_all, int md_all, int mc_all) { 334 rw_all += (md_all + mc_all); // md and mc are all mapped Read/Write 335 int other_bytes = md_all + mc_all; 336 337 // Calculate size of data that was not allocated by Metaspace::allocate() 338 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 339 340 // symbols 341 _counts[RW][SymbolHashentryType] = stats->symbol.hashentry_count; 342 _bytes [RW][SymbolHashentryType] = stats->symbol.hashentry_bytes; 343 other_bytes -= stats->symbol.hashentry_bytes; 344 345 _counts[RW][SymbolBucketType] = stats->symbol.bucket_count; 346 _bytes [RW][SymbolBucketType] = stats->symbol.bucket_bytes; 347 other_bytes -= stats->symbol.bucket_bytes; 348 349 // TODO: count things like dictionary, vtable, etc 350 _bytes[RW][OtherType] = other_bytes; 351 352 // prevent divide-by-zero 353 if (ro_all < 1) { 354 ro_all = 1; 355 } 356 if (rw_all < 1) { 357 rw_all = 1; 358 } 359 360 int all_ro_count = 0; 361 int all_ro_bytes = 0; 362 int all_rw_count = 0; 363 int all_rw_bytes = 0; 364 365 // To make fmt_stats be a syntactic constant (for format warnings), use #define. 366 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 367 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 368 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 369 370 tty->print_cr("Detailed metadata info (rw includes md and mc):"); 371 tty->print_cr("%s", hdr); 372 tty->print_cr("%s", sep); 373 for (int type = 0; type < int(_number_of_types); type ++) { 374 const char *name = type_name((Type)type); 375 int ro_count = _counts[RO][type]; 376 int ro_bytes = _bytes [RO][type]; 377 int rw_count = _counts[RW][type]; 378 int rw_bytes = _bytes [RW][type]; 379 int count = ro_count + rw_count; 380 int bytes = ro_bytes + rw_bytes; 381 382 double ro_perc = 100.0 * double(ro_bytes) / double(ro_all); 383 double rw_perc = 100.0 * double(rw_bytes) / double(rw_all); 384 double perc = 100.0 * double(bytes) / double(ro_all + rw_all); 385 386 tty->print_cr(fmt_stats, name, 387 ro_count, ro_bytes, ro_perc, 388 rw_count, rw_bytes, rw_perc, 389 count, bytes, perc); 390 391 all_ro_count += ro_count; 392 all_ro_bytes += ro_bytes; 393 all_rw_count += rw_count; 394 all_rw_bytes += rw_bytes; 395 } 396 397 int all_count = all_ro_count + all_rw_count; 398 int all_bytes = all_ro_bytes + all_rw_bytes; 399 400 double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all); 401 double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all); 402 double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all); 403 404 tty->print_cr("%s", sep); 405 tty->print_cr(fmt_stats, "Total", 406 all_ro_count, all_ro_bytes, all_ro_perc, 407 all_rw_count, all_rw_bytes, all_rw_perc, 408 all_count, all_bytes, all_perc); 409 410 assert(all_ro_bytes == ro_all, "everything should have been counted"); 411 assert(all_rw_bytes == rw_all, "everything should have been counted"); 412 #undef fmt_stats 413 } 414 415 // Populate the shared space. 416 417 class VM_PopulateDumpSharedSpace: public VM_Operation { 418 private: 419 ClassLoaderData* _loader_data; 420 GrowableArray<Klass*> *_class_promote_order; 421 VirtualSpace _md_vs; 422 VirtualSpace _mc_vs; 423 CompactHashtableWriter* _string_cht; 424 GrowableArray<MemRegion> *_string_regions; 425 426 public: 427 VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data, 428 GrowableArray<Klass*> *class_promote_order) : 429 _loader_data(loader_data) { 430 431 // Split up and initialize the misc code and data spaces 432 ReservedSpace* shared_rs = MetaspaceShared::shared_rs(); 433 size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize; 434 ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size); 435 ReservedSpace misc_section = shared_rs->last_part(metadata_size); 436 437 // Now split into misc sections. 438 ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize); 439 ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize); 440 _md_vs.initialize(md_rs, SharedMiscDataSize); 441 _mc_vs.initialize(mc_rs, SharedMiscCodeSize); 442 _class_promote_order = class_promote_order; 443 } 444 445 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 446 void doit(); // outline because gdb sucks 447 448 private: 449 void handle_misc_data_space_failure(bool success) { 450 if (!success) { 451 report_out_of_shared_space(SharedMiscData); 452 } 453 } 454 }; // class VM_PopulateDumpSharedSpace 455 456 457 void VM_PopulateDumpSharedSpace::doit() { 458 Thread* THREAD = VMThread::vm_thread(); 459 NOT_PRODUCT(SystemDictionary::verify();) 460 // The following guarantee is meant to ensure that no loader constraints 461 // exist yet, since the constraints table is not shared. This becomes 462 // more important now that we don't re-initialize vtables/itables for 463 // shared classes at runtime, where constraints were previously created. 464 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 465 "loader constraints are not saved"); 466 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 467 "placeholders are not saved"); 468 // Revisit and implement this if we prelink method handle call sites: 469 guarantee(SystemDictionary::invoke_method_table() == NULL || 470 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 471 "invoke method table is not saved"); 472 473 // At this point, many classes have been loaded. 474 // Gather systemDictionary classes in a global array and do everything to 475 // that so we don't have to walk the SystemDictionary again. 476 _global_klass_objects = new GrowableArray<Klass*>(1000); 477 Universe::basic_type_classes_do(collect_classes); 478 SystemDictionary::classes_do(collect_classes); 479 480 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 481 { 482 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 483 for (int i = 0; i < _global_klass_objects->length(); i++) { 484 Klass* k = _global_klass_objects->at(i); 485 if (k->oop_is_instance()) { 486 num_inst ++; 487 } else if (k->oop_is_objArray()) { 488 num_obj_array ++; 489 } else { 490 assert(k->oop_is_typeArray(), "sanity"); 491 num_type_array ++; 492 } 493 } 494 tty->print_cr(" instance classes = %5d", num_inst); 495 tty->print_cr(" obj array classes = %5d", num_obj_array); 496 tty->print_cr(" type array classes = %5d", num_type_array); 497 } 498 499 500 // Ensure the ConstMethods won't be modified at run-time 501 tty->print("Updating ConstMethods ... "); 502 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 503 tty->print_cr("done. "); 504 505 // Remove all references outside the metadata 506 tty->print("Removing unshareable information ... "); 507 remove_unshareable_in_classes(); 508 tty->print_cr("done. "); 509 510 // Set up the share data and shared code segments. 511 char* md_low = _md_vs.low(); 512 char* md_top = md_low; 513 char* md_end = _md_vs.high(); 514 char* mc_low = _mc_vs.low(); 515 char* mc_top = mc_low; 516 char* mc_end = _mc_vs.high(); 517 518 // Reserve space for the list of Klass*s whose vtables are used 519 // for patching others as needed. 520 521 void** vtbl_list = (void**)md_top; 522 int vtbl_list_size = MetaspaceShared::vtbl_list_size; 523 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); 524 525 md_top += vtbl_list_size * sizeof(void*); 526 void* vtable = md_top; 527 528 // Reserve space for a new dummy vtable for klass objects in the 529 // heap. Generate self-patching vtable entries. 530 531 MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable, 532 &md_top, md_end, 533 &mc_top, mc_end); 534 535 // Reorder the system dictionary. (Moving the symbols affects 536 // how the hash table indices are calculated.) 537 // Not doing this either. 538 539 SystemDictionary::reorder_dictionary(); 540 541 NOT_PRODUCT(SystemDictionary::verify();) 542 543 // Copy the symbol table, string table, and the system dictionary to the shared 544 // space in usable form. Copy the hashtable 545 // buckets first [read-write], then copy the linked lists of entries 546 // [read-only]. 547 548 NOT_PRODUCT(SymbolTable::verify()); 549 handle_misc_data_space_failure(SymbolTable::copy_compact_table(&md_top, md_end)); 550 551 size_t ss_bytes = 0; 552 char* ss_low; 553 // The string space has maximum two regions. See FileMapInfo::write_string_regions() for details. 554 _string_regions = new GrowableArray<MemRegion>(2); 555 NOT_PRODUCT(StringTable::verify()); 556 handle_misc_data_space_failure(StringTable::copy_compact_table(&md_top, md_end, _string_regions, 557 &ss_bytes)); 558 ss_low = _string_regions->is_empty() ? NULL : (char*)_string_regions->first().start(); 559 560 SystemDictionary::reverse(); 561 SystemDictionary::copy_buckets(&md_top, md_end); 562 563 ClassLoader::verify(); 564 ClassLoader::copy_package_info_buckets(&md_top, md_end); 565 ClassLoader::verify(); 566 567 SystemDictionary::copy_table(&md_top, md_end); 568 ClassLoader::verify(); 569 ClassLoader::copy_package_info_table(&md_top, md_end); 570 ClassLoader::verify(); 571 572 // Write the other data to the output array. 573 WriteClosure wc(md_top, md_end); 574 MetaspaceShared::serialize(&wc); 575 md_top = wc.get_top(); 576 577 // Print shared spaces all the time 578 // To make fmt_space be a syntactic constant (for format warnings), use #define. 579 #define fmt_space "%s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%4.1f%% used] at " INTPTR_FORMAT 580 Metaspace* ro_space = _loader_data->ro_metaspace(); 581 Metaspace* rw_space = _loader_data->rw_metaspace(); 582 583 // Allocated size of each space (may not be all occupied) 584 const size_t ro_alloced = ro_space->capacity_bytes_slow(Metaspace::NonClassType); 585 const size_t rw_alloced = rw_space->capacity_bytes_slow(Metaspace::NonClassType); 586 const size_t md_alloced = md_end-md_low; 587 const size_t mc_alloced = mc_end-mc_low; 588 const size_t total_alloced = ro_alloced + rw_alloced + md_alloced + mc_alloced 589 + ss_bytes; 590 591 // Occupied size of each space. 592 const size_t ro_bytes = ro_space->used_bytes_slow(Metaspace::NonClassType); 593 const size_t rw_bytes = rw_space->used_bytes_slow(Metaspace::NonClassType); 594 const size_t md_bytes = size_t(md_top - md_low); 595 const size_t mc_bytes = size_t(mc_top - mc_low); 596 597 // Percent of total size 598 const size_t total_bytes = ro_bytes + rw_bytes + md_bytes + mc_bytes + ss_bytes; 599 const double ro_t_perc = ro_bytes / double(total_bytes) * 100.0; 600 const double rw_t_perc = rw_bytes / double(total_bytes) * 100.0; 601 const double md_t_perc = md_bytes / double(total_bytes) * 100.0; 602 const double mc_t_perc = mc_bytes / double(total_bytes) * 100.0; 603 const double ss_t_perc = ss_bytes / double(total_bytes) * 100.0; 604 605 // Percent of fullness of each space 606 const double ro_u_perc = ro_bytes / double(ro_alloced) * 100.0; 607 const double rw_u_perc = rw_bytes / double(rw_alloced) * 100.0; 608 const double md_u_perc = md_bytes / double(md_alloced) * 100.0; 609 const double mc_u_perc = mc_bytes / double(mc_alloced) * 100.0; 610 const double total_u_perc = total_bytes / double(total_alloced) * 100.0; 611 612 tty->print_cr(fmt_space, "ro", ro_bytes, ro_t_perc, ro_alloced, ro_u_perc, p2i(ro_space->bottom())); 613 tty->print_cr(fmt_space, "rw", rw_bytes, rw_t_perc, rw_alloced, rw_u_perc, p2i(rw_space->bottom())); 614 tty->print_cr(fmt_space, "md", md_bytes, md_t_perc, md_alloced, md_u_perc, p2i(md_low)); 615 tty->print_cr(fmt_space, "mc", mc_bytes, mc_t_perc, mc_alloced, mc_u_perc, p2i(mc_low)); 616 tty->print_cr(fmt_space, "st", ss_bytes, ss_t_perc, ss_bytes, 100.0, p2i(ss_low)); 617 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%4.1f%% used]", 618 total_bytes, total_alloced, total_u_perc); 619 620 // Update the vtable pointers in all of the Klass objects in the 621 // heap. They should point to newly generated vtable. 622 patch_klass_vtables(vtbl_list, vtable); 623 624 // dunno what this is for. 625 char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass); 626 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*)); 627 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*)); 628 629 // Create and write the archive file that maps the shared spaces. 630 631 FileMapInfo* mapinfo = new FileMapInfo(); 632 mapinfo->populate_header(MetaspaceShared::max_alignment()); 633 634 // Pass 1 - update file offsets in header. 635 mapinfo->write_header(); 636 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); 637 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); 638 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), 639 pointer_delta(md_top, _md_vs.low(), sizeof(char)), 640 SharedMiscDataSize, 641 false, false); 642 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), 643 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), 644 SharedMiscCodeSize, 645 true, true); 646 mapinfo->write_string_regions(_string_regions); 647 648 // Pass 2 - write data. 649 mapinfo->open_for_write(); 650 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 651 mapinfo->write_header(); 652 mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); 653 mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); 654 mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), 655 pointer_delta(md_top, _md_vs.low(), sizeof(char)), 656 SharedMiscDataSize, 657 false, false); 658 mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), 659 pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), 660 SharedMiscCodeSize, 661 true, true); 662 mapinfo->write_string_regions(_string_regions); 663 664 mapinfo->close(); 665 666 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*)); 667 os::free(saved_vtbl); 668 669 if (PrintSharedSpaces) { 670 DumpAllocClosure dac; 671 dac.iterate_metaspace(_loader_data->ro_metaspace(), DumpAllocClosure::RO); 672 dac.iterate_metaspace(_loader_data->rw_metaspace(), DumpAllocClosure::RW); 673 674 dac.dump_stats(int(ro_bytes), int(rw_bytes), int(md_bytes), int(mc_bytes)); 675 } 676 #undef fmt_space 677 } 678 679 680 void MetaspaceShared::link_one_shared_class(Klass* obj, TRAPS) { 681 Klass* k = obj; 682 if (k->oop_is_instance()) { 683 InstanceKlass* ik = (InstanceKlass*) k; 684 // Link the class to cause the bytecodes to be rewritten and the 685 // cpcache to be created. Class verification is done according 686 // to -Xverify setting. 687 _link_classes_made_progress |= try_link_class(ik, THREAD); 688 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 689 } 690 } 691 692 void MetaspaceShared::check_one_shared_class(Klass* k) { 693 if (k->oop_is_instance() && InstanceKlass::cast(k)->check_sharing_error_state()) { 694 _check_classes_made_progress = true; 695 } 696 } 697 698 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 699 // We need to iterate because verification may cause additional classes 700 // to be loaded. 701 do { 702 _link_classes_made_progress = false; 703 SystemDictionary::classes_do(link_one_shared_class, THREAD); 704 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 705 } while (_link_classes_made_progress); 706 707 if (_has_error_classes) { 708 // Mark all classes whose super class or interfaces failed verification. 709 do { 710 // Not completely sure if we need to do this iteratively. Anyway, 711 // we should come here only if there are unverifiable classes, which 712 // shouldn't happen in normal cases. So better safe than sorry. 713 _check_classes_made_progress = false; 714 SystemDictionary::classes_do(check_one_shared_class); 715 } while (_check_classes_made_progress); 716 717 if (IgnoreUnverifiableClassesDuringDump) { 718 // This is useful when running JCK or SQE tests. You should not 719 // enable this when running real apps. 720 SystemDictionary::remove_classes_in_error_state(); 721 } else { 722 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 723 exit(1); 724 } 725 } 726 } 727 728 void MetaspaceShared::prepare_for_dumping() { 729 ClassLoader::initialize_shared_path(); 730 FileMapInfo::allocate_classpath_entry_table(); 731 } 732 733 // Preload classes from a list, populate the shared spaces and dump to a 734 // file. 735 void MetaspaceShared::preload_and_dump(TRAPS) { 736 TraceTime timer("Dump Shared Spaces", TraceStartupTime); 737 ResourceMark rm; 738 739 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 740 MetaspaceShared::shared_rs()->size(), 741 p2i(MetaspaceShared::shared_rs()->base())); 742 743 // Preload classes to be shared. 744 // Should use some os:: method rather than fopen() here. aB. 745 const char* class_list_path; 746 if (SharedClassListFile == NULL) { 747 // Construct the path to the class list (in jre/lib) 748 // Walk up two directories from the location of the VM and 749 // optionally tack on "lib" (depending on platform) 750 char class_list_path_str[JVM_MAXPATHLEN]; 751 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 752 for (int i = 0; i < 3; i++) { 753 char *end = strrchr(class_list_path_str, *os::file_separator()); 754 if (end != NULL) *end = '\0'; 755 } 756 int class_list_path_len = (int)strlen(class_list_path_str); 757 if (class_list_path_len >= 3) { 758 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 759 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 760 jio_snprintf(class_list_path_str + class_list_path_len, 761 sizeof(class_list_path_str) - class_list_path_len, 762 "%slib", os::file_separator()); 763 class_list_path_len += 4; 764 } 765 } 766 } 767 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 768 jio_snprintf(class_list_path_str + class_list_path_len, 769 sizeof(class_list_path_str) - class_list_path_len, 770 "%sclasslist", os::file_separator()); 771 } 772 class_list_path = class_list_path_str; 773 } else { 774 class_list_path = SharedClassListFile; 775 } 776 777 int class_count = 0; 778 GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>(); 779 780 // sun.io.Converters 781 static const char obj_array_sig[] = "[[Ljava/lang/Object;"; 782 SymbolTable::new_permanent_symbol(obj_array_sig, THREAD); 783 784 // java.util.HashMap 785 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;"; 786 SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD); 787 788 tty->print_cr("Loading classes to share ..."); 789 _has_error_classes = false; 790 class_count += preload_and_dump(class_list_path, class_promote_order, 791 THREAD); 792 if (ExtraSharedClassListFile) { 793 class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order, 794 THREAD); 795 } 796 tty->print_cr("Loading classes to share: done."); 797 798 if (PrintSharedSpaces) { 799 tty->print_cr("Shared spaces: preloaded %d classes", class_count); 800 } 801 802 // Rewrite and link classes 803 tty->print_cr("Rewriting and linking classes ..."); 804 805 // Link any classes which got missed. This would happen if we have loaded classes that 806 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 807 // fails verification, all other interfaces that were not specified in the classlist but 808 // are implemented by K are not verified. 809 link_and_cleanup_shared_classes(CATCH); 810 tty->print_cr("Rewriting and linking classes: done"); 811 812 // Create and dump the shared spaces. Everything so far is loaded 813 // with the null class loader. 814 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 815 VM_PopulateDumpSharedSpace op(loader_data, class_promote_order); 816 VMThread::execute(&op); 817 818 // Since various initialization steps have been undone by this process, 819 // it is not reasonable to continue running a java process. 820 exit(0); 821 } 822 823 int MetaspaceShared::preload_and_dump(const char * class_list_path, 824 GrowableArray<Klass*>* class_promote_order, 825 TRAPS) { 826 FILE* file = fopen(class_list_path, "r"); 827 char class_name[256]; 828 int class_count = 0; 829 830 if (file != NULL) { 831 while ((fgets(class_name, sizeof class_name, file)) != NULL) { 832 if (*class_name == '#') { // comment 833 continue; 834 } 835 // Remove trailing newline 836 size_t name_len = strlen(class_name); 837 if (class_name[name_len-1] == '\n') { 838 class_name[name_len-1] = '\0'; 839 } 840 841 // Got a class name - load it. 842 TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD); 843 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol."); 844 Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol, 845 THREAD); 846 CLEAR_PENDING_EXCEPTION; 847 if (klass != NULL) { 848 if (PrintSharedSpaces && Verbose && WizardMode) { 849 tty->print_cr("Shared spaces preloaded: %s", class_name); 850 } 851 852 InstanceKlass* ik = InstanceKlass::cast(klass); 853 854 // Should be class load order as per -XX:+TraceClassLoadingPreorder 855 class_promote_order->append(ik); 856 857 // Link the class to cause the bytecodes to be rewritten and the 858 // cpcache to be created. The linking is done as soon as classes 859 // are loaded in order that the related data structures (klass and 860 // cpCache) are located together. 861 try_link_class(ik, THREAD); 862 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 863 864 class_count++; 865 } else { 866 //tty->print_cr("Preload failed: %s", class_name); 867 } 868 } 869 fclose(file); 870 } else { 871 char errmsg[JVM_MAXPATHLEN]; 872 os::lasterror(errmsg, JVM_MAXPATHLEN); 873 tty->print_cr("Loading classlist failed: %s", errmsg); 874 exit(1); 875 } 876 877 return class_count; 878 } 879 880 // Returns true if the class's status has changed 881 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 882 assert(DumpSharedSpaces, "should only be called during dumping"); 883 if (ik->init_state() < InstanceKlass::linked) { 884 bool saved = BytecodeVerificationLocal; 885 if (!SharedClassUtil::is_shared_boot_class(ik)) { 886 // The verification decision is based on BytecodeVerificationRemote 887 // for non-system classes. Since we are using the NULL classloader 888 // to load non-system classes during dumping, we need to temporarily 889 // change BytecodeVerificationLocal to be the same as 890 // BytecodeVerificationRemote. Note this can cause the parent system 891 // classes also being verified. The extra overhead is acceptable during 892 // dumping. 893 BytecodeVerificationLocal = BytecodeVerificationRemote; 894 } 895 ik->link_class(THREAD); 896 if (HAS_PENDING_EXCEPTION) { 897 ResourceMark rm; 898 tty->print_cr("Preload Warning: Verification failed for %s", 899 ik->external_name()); 900 CLEAR_PENDING_EXCEPTION; 901 ik->set_in_error_state(); 902 _has_error_classes = true; 903 } 904 BytecodeVerificationLocal = saved; 905 return true; 906 } else { 907 return false; 908 } 909 } 910 911 // Closure for serializing initialization data in from a data area 912 // (ptr_array) read from the shared file. 913 914 class ReadClosure : public SerializeClosure { 915 private: 916 intptr_t** _ptr_array; 917 918 inline intptr_t nextPtr() { 919 return *(*_ptr_array)++; 920 } 921 922 public: 923 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 924 925 void do_ptr(void** p) { 926 assert(*p == NULL, "initializing previous initialized pointer."); 927 intptr_t obj = nextPtr(); 928 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 929 "hit tag while initializing ptrs."); 930 *p = (void*)obj; 931 } 932 933 void do_tag(int tag) { 934 int old_tag; 935 old_tag = (int)(intptr_t)nextPtr(); 936 // do_int(&old_tag); 937 assert(tag == old_tag, "old tag doesn't match"); 938 FileMapInfo::assert_mark(tag == old_tag); 939 } 940 941 void do_region(u_char* start, size_t size) { 942 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 943 assert(size % sizeof(intptr_t) == 0, "bad size"); 944 do_tag((int)size); 945 while (size > 0) { 946 *(intptr_t*)start = nextPtr(); 947 start += sizeof(intptr_t); 948 size -= sizeof(intptr_t); 949 } 950 } 951 952 bool reading() const { return true; } 953 }; 954 955 // Return true if given address is in the mapped shared space. 956 bool MetaspaceShared::is_in_shared_space(const void* p) { 957 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p); 958 } 959 960 bool MetaspaceShared::is_string_region(int idx) { 961 return (idx >= MetaspaceShared::first_string && 962 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings); 963 } 964 965 void MetaspaceShared::print_shared_spaces() { 966 if (UseSharedSpaces) { 967 FileMapInfo::current_info()->print_shared_spaces(); 968 } 969 } 970 971 972 // Map shared spaces at requested addresses and return if succeeded. 973 // Need to keep the bounds of the ro and rw space for the Metaspace::contains 974 // call, or is_in_shared_space. 975 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 976 size_t image_alignment = mapinfo->alignment(); 977 978 #ifndef _WINDOWS 979 // Map in the shared memory and then map the regions on top of it. 980 // On Windows, don't map the memory here because it will cause the 981 // mappings of the regions to fail. 982 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 983 if (!shared_rs.is_reserved()) return false; 984 #endif 985 986 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 987 988 char* _ro_base = NULL; 989 char* _rw_base = NULL; 990 char* _md_base = NULL; 991 char* _mc_base = NULL; 992 993 // Map each shared region 994 if ((_ro_base = mapinfo->map_region(ro)) != NULL && 995 mapinfo->verify_region_checksum(ro) && 996 (_rw_base = mapinfo->map_region(rw)) != NULL && 997 mapinfo->verify_region_checksum(rw) && 998 (_md_base = mapinfo->map_region(md)) != NULL && 999 mapinfo->verify_region_checksum(md) && 1000 (_mc_base = mapinfo->map_region(mc)) != NULL && 1001 mapinfo->verify_region_checksum(mc) && 1002 (image_alignment == (size_t)max_alignment()) && 1003 mapinfo->validate_classpath_entry_table()) { 1004 // Success (no need to do anything) 1005 return true; 1006 } else { 1007 // If there was a failure in mapping any of the spaces, unmap the ones 1008 // that succeeded 1009 if (_ro_base != NULL) mapinfo->unmap_region(ro); 1010 if (_rw_base != NULL) mapinfo->unmap_region(rw); 1011 if (_md_base != NULL) mapinfo->unmap_region(md); 1012 if (_mc_base != NULL) mapinfo->unmap_region(mc); 1013 #ifndef _WINDOWS 1014 // Release the entire mapped region 1015 shared_rs.release(); 1016 #endif 1017 // If -Xshare:on is specified, print out the error message and exit VM, 1018 // otherwise, set UseSharedSpaces to false and continue. 1019 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 1020 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 1021 } else { 1022 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1023 } 1024 return false; 1025 } 1026 } 1027 1028 // Read the miscellaneous data from the shared file, and 1029 // serialize it out to its various destinations. 1030 1031 void MetaspaceShared::initialize_shared_spaces() { 1032 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1033 1034 char* buffer = mapinfo->header()->region_addr(md); 1035 1036 // Skip over (reserve space for) a list of addresses of C++ vtables 1037 // for Klass objects. They get filled in later. 1038 1039 void** vtbl_list = (void**)buffer; 1040 buffer += MetaspaceShared::vtbl_list_size * sizeof(void*); 1041 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); 1042 1043 // Skip over (reserve space for) dummy C++ vtables Klass objects. 1044 // They are used as is. 1045 1046 intptr_t vtable_size = *(intptr_t*)buffer; 1047 buffer += sizeof(intptr_t); 1048 buffer += vtable_size; 1049 1050 // Create the shared symbol table using the compact table at this spot in the 1051 // misc data space. (Todo: move this to read-only space. Currently 1052 // this is mapped copy-on-write but will never be written into). 1053 1054 buffer = (char*)SymbolTable::init_shared_table(buffer); 1055 SymbolTable::create_table(); 1056 1057 // Create the shared string table using the compact table 1058 buffer = (char*)StringTable::init_shared_table(mapinfo, buffer); 1059 1060 // Create the shared dictionary using the bucket array at this spot in 1061 // the misc data space. Since the shared dictionary table is never 1062 // modified, this region (of mapped pages) will be (effectively, if 1063 // not explicitly) read-only. 1064 1065 int sharedDictionaryLen = *(intptr_t*)buffer; 1066 buffer += sizeof(intptr_t); 1067 int number_of_entries = *(intptr_t*)buffer; 1068 buffer += sizeof(intptr_t); 1069 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 1070 sharedDictionaryLen, 1071 number_of_entries); 1072 buffer += sharedDictionaryLen; 1073 1074 // Create the package info table using the bucket array at this spot in 1075 // the misc data space. Since the package info table is never 1076 // modified, this region (of mapped pages) will be (effectively, if 1077 // not explicitly) read-only. 1078 1079 int pkgInfoLen = *(intptr_t*)buffer; 1080 buffer += sizeof(intptr_t); 1081 number_of_entries = *(intptr_t*)buffer; 1082 buffer += sizeof(intptr_t); 1083 ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen, 1084 number_of_entries); 1085 buffer += pkgInfoLen; 1086 ClassLoader::verify(); 1087 1088 // The following data in the shared misc data region are the linked 1089 // list elements (HashtableEntry objects) for the shared dictionary 1090 // and package info table. 1091 1092 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 1093 buffer += sizeof(intptr_t); 1094 buffer += len; 1095 1096 len = *(intptr_t*)buffer; // skip over package info table entries 1097 buffer += sizeof(intptr_t); 1098 buffer += len; 1099 1100 len = *(intptr_t*)buffer; // skip over package info table char[] arrays. 1101 buffer += sizeof(intptr_t); 1102 buffer += len; 1103 1104 intptr_t* array = (intptr_t*)buffer; 1105 ReadClosure rc(&array); 1106 serialize(&rc); 1107 1108 // Close the mapinfo file 1109 mapinfo->close(); 1110 1111 if (PrintSharedArchiveAndExit) { 1112 if (PrintSharedDictionary) { 1113 tty->print_cr("\nShared classes:\n"); 1114 SystemDictionary::print_shared(false); 1115 } 1116 if (_archive_loading_failed) { 1117 tty->print_cr("archive is invalid"); 1118 vm_exit(1); 1119 } else { 1120 tty->print_cr("archive is valid"); 1121 vm_exit(0); 1122 } 1123 } 1124 } 1125 1126 void MetaspaceShared::fixup_shared_string_regions() { 1127 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1128 mapinfo->fixup_string_regions(); 1129 } 1130 1131 // JVM/TI RedefineClasses() support: 1132 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 1133 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1134 1135 if (UseSharedSpaces) { 1136 // remap the shared readonly space to shared readwrite, private 1137 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1138 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 1139 return false; 1140 } 1141 } 1142 return true; 1143 } 1144 1145 int MetaspaceShared::count_class(const char* classlist_file) { 1146 if (classlist_file == NULL) { 1147 return 0; 1148 } 1149 char class_name[256]; 1150 int class_count = 0; 1151 FILE* file = fopen(classlist_file, "r"); 1152 if (file != NULL) { 1153 while ((fgets(class_name, sizeof class_name, file)) != NULL) { 1154 if (*class_name == '#') { // comment 1155 continue; 1156 } 1157 class_count++; 1158 } 1159 fclose(file); 1160 } else { 1161 char errmsg[JVM_MAXPATHLEN]; 1162 os::lasterror(errmsg, JVM_MAXPATHLEN); 1163 tty->print_cr("Loading classlist failed: %s", errmsg); 1164 exit(1); 1165 } 1166 1167 return class_count; 1168 } 1169 1170 // the sizes are good for typical large applications that have a lot of shared 1171 // classes 1172 void MetaspaceShared::estimate_regions_size() { 1173 int class_count = count_class(SharedClassListFile); 1174 class_count += count_class(ExtraSharedClassListFile); 1175 1176 if (class_count > LargeThresholdClassCount) { 1177 if (class_count < HugeThresholdClassCount) { 1178 SET_ESTIMATED_SIZE(Large, ReadOnly); 1179 SET_ESTIMATED_SIZE(Large, ReadWrite); 1180 SET_ESTIMATED_SIZE(Large, MiscData); 1181 SET_ESTIMATED_SIZE(Large, MiscCode); 1182 } else { 1183 SET_ESTIMATED_SIZE(Huge, ReadOnly); 1184 SET_ESTIMATED_SIZE(Huge, ReadWrite); 1185 SET_ESTIMATED_SIZE(Huge, MiscData); 1186 SET_ESTIMATED_SIZE(Huge, MiscCode); 1187 } 1188 } 1189 }