1 /*
   2  * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "cds/aotClassLocation.hpp"
  26 #include "cds/aotLogging.hpp"
  27 #include "cds/aotMetaspace.hpp"
  28 #include "cds/archiveBuilder.hpp"
  29 #include "cds/archiveHeapLoader.inline.hpp"
  30 #include "cds/archiveHeapWriter.hpp"
  31 #include "cds/archiveUtils.inline.hpp"
  32 #include "cds/cds_globals.hpp"
  33 #include "cds/cdsConfig.hpp"
  34 #include "cds/dynamicArchive.hpp"
  35 #include "cds/filemap.hpp"
  36 #include "cds/heapShared.hpp"
  37 #include "classfile/altHashing.hpp"
  38 #include "classfile/classFileStream.hpp"
  39 #include "classfile/classLoader.hpp"
  40 #include "classfile/classLoader.inline.hpp"
  41 #include "classfile/classLoaderData.inline.hpp"
  42 #include "classfile/symbolTable.hpp"
  43 #include "classfile/systemDictionaryShared.hpp"
  44 #include "classfile/vmClasses.hpp"
  45 #include "classfile/vmSymbols.hpp"
  46 #include "compiler/compilerDefinitions.inline.hpp"
  47 #include "jvm.h"
  48 #include "logging/log.hpp"
  49 #include "logging/logMessage.hpp"
  50 #include "logging/logStream.hpp"
  51 #include "memory/iterator.inline.hpp"
  52 #include "memory/metadataFactory.hpp"
  53 #include "memory/metaspaceClosure.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/universe.hpp"
  56 #include "nmt/memTracker.hpp"
  57 #include "oops/access.hpp"
  58 #include "oops/compressedKlass.hpp"
  59 #include "oops/compressedOops.hpp"
  60 #include "oops/compressedOops.inline.hpp"
  61 #include "oops/objArrayOop.hpp"
  62 #include "oops/oop.inline.hpp"
  63 #include "oops/trainingData.hpp"
  64 #include "oops/typeArrayKlass.hpp"
  65 #include "prims/jvmtiExport.hpp"
  66 #include "runtime/arguments.hpp"
  67 #include "runtime/globals_extension.hpp"
  68 #include "runtime/java.hpp"
  69 #include "runtime/javaCalls.hpp"
  70 #include "runtime/mutexLocker.hpp"
  71 #include "runtime/os.hpp"
  72 #include "runtime/vm_version.hpp"
  73 #include "utilities/align.hpp"
  74 #include "utilities/bitMap.inline.hpp"
  75 #include "utilities/classpathStream.hpp"
  76 #include "utilities/defaultStream.hpp"
  77 #include "utilities/ostream.hpp"
  78 #if INCLUDE_G1GC
  79 #include "gc/g1/g1CollectedHeap.hpp"
  80 #include "gc/g1/g1HeapRegion.hpp"
  81 #endif
  82 
  83 #include <errno.h>
  84 #include <sys/stat.h>
  85 
  86 #ifndef O_BINARY       // if defined (Win32) use binary files.
  87 #define O_BINARY 0     // otherwise do nothing.
  88 #endif
  89 
  90 // Fill in the fileMapInfo structure with data about this VM instance.
  91 
  92 // This method copies the vm version info into header_version.  If the version is too
  93 // long then a truncated version, which has a hash code appended to it, is copied.
  94 //
  95 // Using a template enables this method to verify that header_version is an array of
  96 // length JVM_IDENT_MAX.  This ensures that the code that writes to the CDS file and
  97 // the code that reads the CDS file will both use the same size buffer.  Hence, will
  98 // use identical truncation.  This is necessary for matching of truncated versions.
  99 template <int N> static void get_header_version(char (&header_version) [N]) {
 100   assert(N == JVM_IDENT_MAX, "Bad header_version size");
 101 
 102   const char *vm_version = VM_Version::internal_vm_info_string();
 103   const int version_len = (int)strlen(vm_version);
 104 
 105   memset(header_version, 0, JVM_IDENT_MAX);
 106 
 107   if (version_len < (JVM_IDENT_MAX-1)) {
 108     strcpy(header_version, vm_version);
 109 
 110   } else {
 111     // Get the hash value.  Use a static seed because the hash needs to return the same
 112     // value over multiple jvm invocations.
 113     uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len);
 114 
 115     // Truncate the ident, saving room for the 8 hex character hash value.
 116     strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
 117 
 118     // Append the hash code as eight hex digits.
 119     os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash);
 120     header_version[JVM_IDENT_MAX-1] = 0;  // Null terminate.
 121   }
 122 
 123   assert(header_version[JVM_IDENT_MAX-1] == 0, "must be");
 124 }
 125 
 126 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) :
 127   _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0),
 128   _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) {
 129   if (_is_static) {
 130     assert(_current_info == nullptr, "must be singleton"); // not thread safe
 131     _current_info = this;
 132   } else {
 133     assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe
 134     _dynamic_archive_info = this;
 135   }
 136 }
 137 
 138 FileMapInfo::~FileMapInfo() {
 139   if (_is_static) {
 140     assert(_current_info == this, "must be singleton"); // not thread safe
 141     _current_info = nullptr;
 142   } else {
 143     assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe
 144     _dynamic_archive_info = nullptr;
 145   }
 146 
 147   if (_header != nullptr) {
 148     os::free(_header);
 149   }
 150 
 151   if (_file_open) {
 152     ::close(_fd);
 153   }
 154 }
 155 
 156 void FileMapInfo::free_current_info() {
 157   assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode");
 158   assert(_current_info != nullptr, "sanity");
 159   delete _current_info;
 160   assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator.
 161 }
 162 
 163 void FileMapInfo::populate_header(size_t core_region_alignment) {
 164   assert(_header == nullptr, "Sanity check");
 165   size_t c_header_size;
 166   size_t header_size;
 167   size_t base_archive_name_size = 0;
 168   size_t base_archive_name_offset = 0;
 169   if (is_static()) {
 170     c_header_size = sizeof(FileMapHeader);
 171     header_size = c_header_size;
 172   } else {
 173     // dynamic header including base archive name for non-default base archive
 174     c_header_size = sizeof(DynamicArchiveHeader);
 175     header_size = c_header_size;
 176 
 177     const char* default_base_archive_name = CDSConfig::default_archive_path();
 178     const char* current_base_archive_name = CDSConfig::input_static_archive_path();
 179     if (!os::same_files(current_base_archive_name, default_base_archive_name)) {
 180       base_archive_name_size = strlen(current_base_archive_name) + 1;
 181       header_size += base_archive_name_size;
 182       base_archive_name_offset = c_header_size;
 183     }
 184   }
 185   _header = (FileMapHeader*)os::malloc(header_size, mtInternal);
 186   memset((void*)_header, 0, header_size);
 187   _header->populate(this,
 188                     core_region_alignment,
 189                     header_size,
 190                     base_archive_name_size,
 191                     base_archive_name_offset);
 192 }
 193 
 194 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment,
 195                              size_t header_size, size_t base_archive_name_size,
 196                              size_t base_archive_name_offset) {
 197   // 1. We require _generic_header._magic to be at the beginning of the file
 198   // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file
 199   assert(offset_of(FileMapHeader, _generic_header) == 0, "must be");
 200   set_header_size((unsigned int)header_size);
 201   set_base_archive_name_offset((unsigned int)base_archive_name_offset);
 202   set_base_archive_name_size((unsigned int)base_archive_name_size);
 203   if (CDSConfig::is_dumping_dynamic_archive()) {
 204     set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC);
 205   } else if (CDSConfig::is_dumping_preimage_static_archive()) {
 206     set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC);
 207   } else {
 208     set_magic(CDS_ARCHIVE_MAGIC);
 209   }
 210   set_version(CURRENT_CDS_ARCHIVE_VERSION);
 211 
 212   if (!info->is_static() && base_archive_name_size != 0) {
 213     // copy base archive name
 214     copy_base_archive_name(CDSConfig::input_static_archive_path());
 215   }
 216   _core_region_alignment = core_region_alignment;
 217   _obj_alignment = ObjectAlignmentInBytes;
 218   _compact_strings = CompactStrings;
 219   _compact_headers = UseCompactObjectHeaders;
 220   if (CDSConfig::is_dumping_heap()) {
 221     _narrow_oop_mode = CompressedOops::mode();
 222     _narrow_oop_base = CompressedOops::base();
 223     _narrow_oop_shift = CompressedOops::shift();
 224   }
 225   _compressed_oops = UseCompressedOops;
 226   _compressed_class_ptrs = UseCompressedClassPointers;
 227   if (UseCompressedClassPointers) {
 228 #ifdef _LP64
 229     _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits();
 230     _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
 231 #endif
 232   } else {
 233     _narrow_klass_pointer_bits = _narrow_klass_shift = -1;
 234   }
 235   // Which JIT compier is used
 236   _compiler_type = (u1)CompilerConfig::compiler_type();
 237   _type_profile_level = TypeProfileLevel;
 238   _type_profile_args_limit = TypeProfileArgsLimit;
 239   _type_profile_parms_limit = TypeProfileParmsLimit;
 240   _type_profile_width = TypeProfileWidth;
 241   _bci_profile_width = BciProfileWidth;
 242   _profile_traps = ProfileTraps;
 243   _type_profile_casts = TypeProfileCasts;
 244   _spec_trap_limit_extra_entries = SpecTrapLimitExtraEntries;
 245   _max_heap_size = MaxHeapSize;
 246   _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling();
 247   _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes();
 248   _has_full_module_graph = CDSConfig::is_dumping_full_module_graph();
 249   _gc_kind = (int)Universe::heap()->kind();
 250   jio_snprintf(_gc_name, sizeof(_gc_name), Universe::heap()->name());
 251 
 252   // The following fields are for sanity checks for whether this archive
 253   // will function correctly with this JVM and the bootclasspath it's
 254   // invoked with.
 255 
 256   // JVM version string ... changes on each build.
 257   get_header_version(_jvm_ident);
 258 
 259   _verify_local = BytecodeVerificationLocal;
 260   _verify_remote = BytecodeVerificationRemote;
 261   _has_platform_or_app_classes = AOTClassLocationConfig::dumptime()->has_platform_or_app_classes();
 262   _requested_base_address = (char*)SharedBaseAddress;
 263   _mapped_base_address = (char*)SharedBaseAddress;
 264 }
 265 
 266 void FileMapHeader::copy_base_archive_name(const char* archive) {
 267   assert(base_archive_name_size() != 0, "_base_archive_name_size not set");
 268   assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set");
 269   assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?");
 270   memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size());
 271 }
 272 
 273 void FileMapHeader::print(outputStream* st) {
 274   ResourceMark rm;
 275 
 276   st->print_cr("- magic:                          0x%08x", magic());
 277   st->print_cr("- crc:                            0x%08x", crc());
 278   st->print_cr("- version:                        0x%x", version());
 279   st->print_cr("- header_size:                    " UINT32_FORMAT, header_size());
 280   st->print_cr("- base_archive_name_offset:       " UINT32_FORMAT, base_archive_name_offset());
 281   st->print_cr("- base_archive_name_size:         " UINT32_FORMAT, base_archive_name_size());
 282 
 283   for (int i = 0; i < NUM_CDS_REGIONS; i++) {
 284     FileMapRegion* r = region_at(i);
 285     r->print(st, i);
 286   }
 287   st->print_cr("============ end regions ======== ");
 288 
 289   st->print_cr("- core_region_alignment:          %zu", _core_region_alignment);
 290   st->print_cr("- obj_alignment:                  %d", _obj_alignment);
 291   st->print_cr("- narrow_oop_base:                " INTPTR_FORMAT, p2i(_narrow_oop_base));
 292   st->print_cr("- narrow_oop_shift                %d", _narrow_oop_shift);
 293   st->print_cr("- compact_strings:                %d", _compact_strings);
 294   st->print_cr("- compact_headers:                %d", _compact_headers);
 295   st->print_cr("- max_heap_size:                  %zu", _max_heap_size);
 296   st->print_cr("- narrow_oop_mode:                %d", _narrow_oop_mode);
 297   st->print_cr("- compressed_oops:                %d", _compressed_oops);
 298   st->print_cr("- compressed_class_ptrs:          %d", _compressed_class_ptrs);
 299   st->print_cr("- narrow_klass_pointer_bits:      %d", _narrow_klass_pointer_bits);
 300   st->print_cr("- narrow_klass_shift:             %d", _narrow_klass_shift);
 301   st->print_cr("- cloned_vtables_offset:          0x%zx", _cloned_vtables_offset);
 302   st->print_cr("- early_serialized_data_offset:   0x%zx", _early_serialized_data_offset);
 303   st->print_cr("- serialized_data_offset:         0x%zx", _serialized_data_offset);
 304   st->print_cr("- jvm_ident:                      %s", _jvm_ident);
 305   st->print_cr("- class_location_config_offset:   0x%zx", _class_location_config_offset);
 306   st->print_cr("- verify_local:                   %d", _verify_local);
 307   st->print_cr("- verify_remote:                  %d", _verify_remote);
 308   st->print_cr("- has_platform_or_app_classes:    %d", _has_platform_or_app_classes);
 309   st->print_cr("- requested_base_address:         " INTPTR_FORMAT, p2i(_requested_base_address));
 310   st->print_cr("- mapped_base_address:            " INTPTR_FORMAT, p2i(_mapped_base_address));
 311   st->print_cr("- heap_root_segments.roots_count: %d" , _heap_root_segments.roots_count());
 312   st->print_cr("- heap_root_segments.base_offset: 0x%zx", _heap_root_segments.base_offset());
 313   st->print_cr("- heap_root_segments.count:       %zu", _heap_root_segments.count());
 314   st->print_cr("- heap_root_segments.max_size_elems: %d", _heap_root_segments.max_size_in_elems());
 315   st->print_cr("- heap_root_segments.max_size_bytes: %d", _heap_root_segments.max_size_in_bytes());
 316   st->print_cr("- _heap_oopmap_start_pos:         %zu", _heap_oopmap_start_pos);
 317   st->print_cr("- _heap_ptrmap_start_pos:         %zu", _heap_ptrmap_start_pos);
 318   st->print_cr("- _rw_ptrmap_start_pos:           %zu", _rw_ptrmap_start_pos);
 319   st->print_cr("- _ro_ptrmap_start_pos:           %zu", _ro_ptrmap_start_pos);
 320   st->print_cr("- use_optimized_module_handling:  %d", _use_optimized_module_handling);
 321   st->print_cr("- has_full_module_graph           %d", _has_full_module_graph);
 322   st->print_cr("- has_aot_linked_classes          %d", _has_aot_linked_classes);
 323   st->print_cr("- ptrmap_size_in_bits:            %zu", _ptrmap_size_in_bits);
 324 }
 325 
 326 bool FileMapInfo::validate_class_location() {
 327   assert(CDSConfig::is_using_archive(), "runtime only");
 328 
 329   AOTClassLocationConfig* config = header()->class_location_config();
 330   bool has_extra_module_paths = false;
 331   if (!config->validate(full_path(), header()->has_aot_linked_classes(), &has_extra_module_paths)) {
 332     if (PrintSharedArchiveAndExit) {
 333       AOTMetaspace::set_archive_loading_failed();
 334       return true;
 335     } else {
 336       return false;
 337     }
 338   }
 339 
 340   if (header()->has_full_module_graph() && has_extra_module_paths) {
 341     CDSConfig::stop_using_optimized_module_handling();
 342     AOTMetaspace::report_loading_error("optimized module handling: disabled because extra module path(s) are specified");
 343   }
 344 
 345   if (CDSConfig::is_dumping_dynamic_archive()) {
 346     // Only support dynamic dumping with the usage of the default CDS archive
 347     // or a simple base archive.
 348     // If the base layer archive contains additional path component besides
 349     // the runtime image and the -cp, dynamic dumping is disabled.
 350     if (config->num_boot_classpaths() > 0) {
 351       CDSConfig::disable_dumping_dynamic_archive();
 352       aot_log_warning(aot)(
 353         "Dynamic archiving is disabled because base layer archive has appended boot classpath");
 354     }
 355     if (config->num_module_paths() > 0) {
 356       if (has_extra_module_paths) {
 357         CDSConfig::disable_dumping_dynamic_archive();
 358         aot_log_warning(aot)(
 359           "Dynamic archiving is disabled because base layer archive has a different module path");
 360       }
 361     }
 362   }
 363 
 364 #if INCLUDE_JVMTI
 365   if (_classpath_entries_for_jvmti != nullptr) {
 366     os::free(_classpath_entries_for_jvmti);
 367   }
 368   size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length();
 369   _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass);
 370   memset((void*)_classpath_entries_for_jvmti, 0, sz);
 371 #endif
 372 
 373   return true;
 374 }
 375 
 376 // A utility class for reading/validating the GenericCDSFileMapHeader portion of
 377 // a CDS archive's header. The file header of all CDS archives with versions from
 378 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start
 379 // with GenericCDSFileMapHeader. This makes it possible to read important information
 380 // from a CDS archive created by a different version of HotSpot, so that we can
 381 // automatically regenerate the archive as necessary (JDK-8261455).
 382 class FileHeaderHelper {
 383   int _fd;
 384   bool _is_valid;
 385   bool _is_static;
 386   GenericCDSFileMapHeader* _header;
 387   const char* _archive_name;
 388   const char* _base_archive_name;
 389 
 390 public:
 391   FileHeaderHelper(const char* archive_name, bool is_static) {
 392     _fd = -1;
 393     _is_valid = false;
 394     _header = nullptr;
 395     _base_archive_name = nullptr;
 396     _archive_name = archive_name;
 397     _is_static = is_static;
 398   }
 399 
 400   ~FileHeaderHelper() {
 401     if (_header != nullptr) {
 402       FREE_C_HEAP_ARRAY(char, _header);
 403     }
 404     if (_fd != -1) {
 405       ::close(_fd);
 406     }
 407   }
 408 
 409   bool initialize() {
 410     assert(_archive_name != nullptr, "Archive name is null");
 411     _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0);
 412     if (_fd < 0) {
 413       AOTMetaspace::report_loading_error("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name);
 414       return false;
 415     }
 416     return initialize(_fd);
 417   }
 418 
 419   // for an already opened file, do not set _fd
 420   bool initialize(int fd) {
 421     assert(_archive_name != nullptr, "Archive name is null");
 422     assert(fd != -1, "Archive must be opened already");
 423     // First read the generic header so we know the exact size of the actual header.
 424     const char* file_type = CDSConfig::type_of_archive_being_loaded();
 425     GenericCDSFileMapHeader gen_header;
 426     size_t size = sizeof(GenericCDSFileMapHeader);
 427     os::lseek(fd, 0, SEEK_SET);
 428     size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size);
 429     if (n != size) {
 430       aot_log_warning(aot)("Unable to read generic CDS file map header from %s", file_type);
 431       return false;
 432     }
 433 
 434     if (gen_header._magic != CDS_ARCHIVE_MAGIC &&
 435         gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC &&
 436         gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) {
 437       aot_log_warning(aot)("The %s has a bad magic number: %#x", file_type, gen_header._magic);
 438       return false;
 439     }
 440 
 441     if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) {
 442       aot_log_warning(aot)("Cannot handle %s version 0x%x. Must be at least 0x%x.",
 443                        file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION);
 444       return false;
 445     }
 446 
 447     if (gen_header._version !=  CURRENT_CDS_ARCHIVE_VERSION) {
 448       aot_log_warning(aot)("The %s version 0x%x does not match the required version 0x%x.",
 449                        file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION);
 450     }
 451 
 452     size_t filelen = os::lseek(fd, 0, SEEK_END);
 453     if (gen_header._header_size >= filelen) {
 454       aot_log_warning(aot)("Archive file header larger than archive file");
 455       return false;
 456     }
 457 
 458     // Read the actual header and perform more checks
 459     size = gen_header._header_size;
 460     _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal);
 461     os::lseek(fd, 0, SEEK_SET);
 462     n = ::read(fd, (void*)_header, (unsigned int)size);
 463     if (n != size) {
 464       aot_log_warning(aot)("Unable to read file map header from %s", file_type);
 465       return false;
 466     }
 467 
 468     if (!check_header_crc()) {
 469       return false;
 470     }
 471 
 472     if (!check_and_init_base_archive_name()) {
 473       return false;
 474     }
 475 
 476     // All fields in the GenericCDSFileMapHeader has been validated.
 477     _is_valid = true;
 478     return true;
 479   }
 480 
 481   GenericCDSFileMapHeader* get_generic_file_header() {
 482     assert(_header != nullptr && _is_valid, "must be a valid archive file");
 483     return _header;
 484   }
 485 
 486   const char* base_archive_name() {
 487     assert(_header != nullptr && _is_valid, "must be a valid archive file");
 488     return _base_archive_name;
 489   }
 490 
 491   bool is_static_archive() const {
 492     return _header->_magic == CDS_ARCHIVE_MAGIC;
 493   }
 494 
 495   bool is_dynamic_archive() const {
 496     return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC;
 497   }
 498 
 499   bool is_preimage_static_archive() const {
 500     return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC;
 501   }
 502 
 503  private:
 504   bool check_header_crc() const {
 505     if (VerifySharedSpaces) {
 506       FileMapHeader* header = (FileMapHeader*)_header;
 507       int actual_crc = header->compute_crc();
 508       if (actual_crc != header->crc()) {
 509         aot_log_info(aot)("_crc expected: %d", header->crc());
 510         aot_log_info(aot)("       actual: %d", actual_crc);
 511         aot_log_warning(aot)("Header checksum verification failed.");
 512         return false;
 513       }
 514     }
 515     return true;
 516   }
 517 
 518   bool check_and_init_base_archive_name() {
 519     unsigned int name_offset = _header->_base_archive_name_offset;
 520     unsigned int name_size   = _header->_base_archive_name_size;
 521     unsigned int header_size = _header->_header_size;
 522 
 523     if (name_offset + name_size < name_offset) {
 524       aot_log_warning(aot)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT,
 525                                  name_offset, name_size);
 526       return false;
 527     }
 528 
 529     if (is_static_archive() || is_preimage_static_archive()) {
 530       if (name_offset != 0) {
 531         aot_log_warning(aot)("static shared archive must have zero _base_archive_name_offset");
 532         return false;
 533       }
 534       if (name_size != 0) {
 535         aot_log_warning(aot)("static shared archive must have zero _base_archive_name_size");
 536         return false;
 537       }
 538     } else {
 539       assert(is_dynamic_archive(), "must be");
 540       if ((name_size == 0 && name_offset != 0) ||
 541           (name_size != 0 && name_offset == 0)) {
 542         // If either is zero, both must be zero. This indicates that we are using the default base archive.
 543         aot_log_warning(aot)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT,
 544                                    name_offset, name_size);
 545         return false;
 546       }
 547       if (name_size > 0) {
 548         if (name_offset + name_size > header_size) {
 549           aot_log_warning(aot)("Invalid base_archive_name offset/size (out of range): "
 550                                      UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT ,
 551                                      name_offset, name_size, header_size);
 552           return false;
 553         }
 554         const char* name = ((const char*)_header) + _header->_base_archive_name_offset;
 555         if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) {
 556           aot_log_warning(aot)("Base archive name is damaged");
 557           return false;
 558         }
 559         if (!os::file_exists(name)) {
 560           aot_log_warning(aot)("Base archive %s does not exist", name);
 561           return false;
 562         }
 563         _base_archive_name = name;
 564       }
 565     }
 566 
 567     return true;
 568   }
 569 };
 570 
 571 // Return value:
 572 // false:
 573 //      <archive_name> is not a valid archive. *base_archive_name is set to null.
 574 // true && (*base_archive_name) == nullptr:
 575 //      <archive_name> is a valid static archive.
 576 // true && (*base_archive_name) != nullptr:
 577 //      <archive_name> is a valid dynamic archive.
 578 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name,
 579                                                     const char** base_archive_name) {
 580   FileHeaderHelper file_helper(archive_name, false);
 581   *base_archive_name = nullptr;
 582 
 583   if (!file_helper.initialize()) {
 584     return false;
 585   }
 586   GenericCDSFileMapHeader* header = file_helper.get_generic_file_header();
 587   switch (header->_magic) {
 588   case CDS_PREIMAGE_ARCHIVE_MAGIC:
 589     return false; // This is a binary config file, not a proper archive
 590   case CDS_DYNAMIC_ARCHIVE_MAGIC:
 591     break;
 592   default:
 593     assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be");
 594     if (AutoCreateSharedArchive) {
 595      aot_log_warning(aot)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name);
 596     }
 597     return true;
 598   }
 599 
 600   const char* base = file_helper.base_archive_name();
 601   if (base == nullptr) {
 602     *base_archive_name = CDSConfig::default_archive_path();
 603   } else {
 604     *base_archive_name = os::strdup_check_oom(base);
 605   }
 606 
 607   return true;
 608 }
 609 
 610 bool FileMapInfo::is_preimage_static_archive(const char* file) {
 611   FileHeaderHelper file_helper(file, false);
 612   if (!file_helper.initialize()) {
 613     return false;
 614   }
 615   return file_helper.is_preimage_static_archive();
 616 }
 617 
 618 // Read the FileMapInfo information from the file.
 619 
 620 bool FileMapInfo::init_from_file(int fd) {
 621   FileHeaderHelper file_helper(_full_path, _is_static);
 622   if (!file_helper.initialize(fd)) {
 623     aot_log_warning(aot)("Unable to read the file header.");
 624     return false;
 625   }
 626   GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header();
 627 
 628   const char* file_type = CDSConfig::type_of_archive_being_loaded();
 629   if (_is_static) {
 630     if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) ||
 631         (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) {
 632       // Good
 633     } else {
 634       if (CDSConfig::new_aot_flags_used()) {
 635         aot_log_warning(aot)("Not a valid %s (%s)", file_type, _full_path);
 636       } else {
 637         aot_log_warning(aot)("Not a base shared archive: %s", _full_path);
 638       }
 639       return false;
 640     }
 641   } else {
 642     if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) {
 643       aot_log_warning(aot)("Not a top shared archive: %s", _full_path);
 644       return false;
 645     }
 646   }
 647 
 648   _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal);
 649   os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive
 650   size_t size = gen_header->_header_size;
 651   size_t n = ::read(fd, (void*)_header, (unsigned int)size);
 652   if (n != size) {
 653     aot_log_warning(aot)("Failed to read file header from the top archive file\n");
 654     return false;
 655   }
 656 
 657   if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) {
 658     aot_log_info(aot)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION);
 659     aot_log_info(aot)("           actual: 0x%x", header()->version());
 660     aot_log_warning(aot)("The %s has the wrong version.", file_type);
 661     return false;
 662   }
 663 
 664   unsigned int base_offset = header()->base_archive_name_offset();
 665   unsigned int name_size = header()->base_archive_name_size();
 666   unsigned int header_size = header()->header_size();
 667   if (base_offset != 0 && name_size != 0) {
 668     if (header_size != base_offset + name_size) {
 669       aot_log_info(aot)("_header_size: " UINT32_FORMAT, header_size);
 670       aot_log_info(aot)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size());
 671       aot_log_info(aot)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset());
 672       aot_log_warning(aot)("The %s has an incorrect header size.", file_type);
 673       return false;
 674     }
 675   }
 676 
 677   const char* actual_ident = header()->jvm_ident();
 678 
 679   if (actual_ident[JVM_IDENT_MAX-1] != 0) {
 680     aot_log_warning(aot)("JVM version identifier is corrupted.");
 681     return false;
 682   }
 683 
 684   char expected_ident[JVM_IDENT_MAX];
 685   get_header_version(expected_ident);
 686   if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) {
 687     aot_log_info(aot)("_jvm_ident expected: %s", expected_ident);
 688     aot_log_info(aot)("             actual: %s", actual_ident);
 689     aot_log_warning(aot)("The %s was created by a different"
 690                   " version or build of HotSpot", file_type);
 691     return false;
 692   }
 693 
 694   _file_offset = header()->header_size(); // accounts for the size of _base_archive_name
 695 
 696   size_t len = os::lseek(fd, 0, SEEK_END);
 697 
 698   for (int i = 0; i < AOTMetaspace::n_regions; i++) {
 699     FileMapRegion* r = region_at(i);
 700     if (r->file_offset() > len || len - r->file_offset() < r->used()) {
 701       aot_log_warning(aot)("The %s has been truncated.", file_type);
 702       return false;
 703     }
 704   }
 705 
 706   return true;
 707 }
 708 
 709 void FileMapInfo::seek_to_position(size_t pos) {
 710   if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) {
 711     aot_log_error(aot)("Unable to seek to position %zu", pos);
 712     AOTMetaspace::unrecoverable_loading_error();
 713   }
 714 }
 715 
 716 // Read the FileMapInfo information from the file.
 717 bool FileMapInfo::open_for_read() {
 718   if (_file_open) {
 719     return true;
 720   }
 721   const char* file_type = CDSConfig::type_of_archive_being_loaded();
 722   const char* info = CDSConfig::is_dumping_final_static_archive() ?
 723     "AOTConfiguration file " : "";
 724   aot_log_info(aot)("trying to map %s%s", info, _full_path);
 725   int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0);
 726   if (fd < 0) {
 727     if (errno == ENOENT) {
 728       aot_log_info(aot)("Specified %s not found (%s)", file_type, _full_path);
 729     } else {
 730       aot_log_warning(aot)("Failed to open %s (%s)", file_type,
 731                     os::strerror(errno));
 732     }
 733     return false;
 734   } else {
 735     aot_log_info(aot)("Opened %s %s.", file_type, _full_path);
 736   }
 737 
 738   _fd = fd;
 739   _file_open = true;
 740   return true;
 741 }
 742 
 743 // Write the FileMapInfo information to the file.
 744 
 745 void FileMapInfo::open_as_output() {
 746   if (CDSConfig::new_aot_flags_used()) {
 747     if (CDSConfig::is_dumping_preimage_static_archive()) {
 748       log_info(aot)("Writing binary AOTConfiguration file: %s",  _full_path);
 749     } else {
 750       log_info(aot)("Writing AOTCache file: %s",  _full_path);
 751     }
 752   } else {
 753     aot_log_info(aot)("Dumping shared data to file: %s", _full_path);
 754   }
 755 
 756 #ifdef _WINDOWS  // On Windows, need WRITE permission to remove the file.
 757   chmod(_full_path, _S_IREAD | _S_IWRITE);
 758 #endif
 759 
 760   // Use remove() to delete the existing file because, on Unix, this will
 761   // allow processes that have it open continued access to the file.
 762   remove(_full_path);
 763   int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666);
 764   if (fd < 0) {
 765     aot_log_error(aot)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path,
 766                    os::strerror(errno));
 767     AOTMetaspace::writing_error();
 768     return;
 769   }
 770   _fd = fd;
 771   _file_open = true;
 772 
 773   // Seek past the header. We will write the header after all regions are written
 774   // and their CRCs computed.
 775   size_t header_bytes = header()->header_size();
 776 
 777   header_bytes = align_up(header_bytes, AOTMetaspace::core_region_alignment());
 778   _file_offset = header_bytes;
 779   seek_to_position(_file_offset);
 780 }
 781 
 782 // Write the header to the file, seek to the next allocation boundary.
 783 
 784 void FileMapInfo::write_header() {
 785   _file_offset = 0;
 786   seek_to_position(_file_offset);
 787   assert(is_file_position_aligned(), "must be");
 788   write_bytes(header(), header()->header_size());
 789 }
 790 
 791 size_t FileMapRegion::used_aligned() const {
 792   return align_up(used(), AOTMetaspace::core_region_alignment());
 793 }
 794 
 795 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only,
 796                          bool allow_exec, int crc) {
 797   _is_heap_region = HeapShared::is_heap_region(region_index);
 798   _is_bitmap_region = (region_index == AOTMetaspace::bm);
 799   _mapping_offset = mapping_offset;
 800   _used = size;
 801   _read_only = read_only;
 802   _allow_exec = allow_exec;
 803   _crc = crc;
 804   _mapped_from_file = false;
 805   _mapped_base = nullptr;
 806   _in_reserved_space = false;
 807 }
 808 
 809 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) {
 810   _oopmap_offset = offset;
 811   _oopmap_size_in_bits = size_in_bits;
 812 }
 813 
 814 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) {
 815   _ptrmap_offset = offset;
 816   _ptrmap_size_in_bits = size_in_bits;
 817 }
 818 
 819 bool FileMapRegion::check_region_crc(char* base) const {
 820   // This function should be called after the region has been properly
 821   // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region().
 822   // I.e., this->mapped_base() must be valid.
 823   size_t sz = used();
 824   if (sz == 0) {
 825     return true;
 826   }
 827 
 828   assert(base != nullptr, "must be initialized");
 829   int crc = ClassLoader::crc32(0, base, (jint)sz);
 830   if (crc != this->crc()) {
 831     aot_log_warning(aot)("Checksum verification failed.");
 832     return false;
 833   }
 834   return true;
 835 }
 836 
 837 static const char* region_name(int region_index) {
 838   static const char* names[] = {
 839     "rw", "ro", "bm", "hp", "ac"
 840   };
 841   const int num_regions = sizeof(names)/sizeof(names[0]);
 842   assert(0 <= region_index && region_index < num_regions, "sanity");
 843 
 844   return names[region_index];
 845 }
 846 
 847 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) {
 848   FileMapRegion* r = region_at(region_index);
 849   char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region();
 850   bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset();
 851   size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits();
 852 
 853   aot_log_debug(aot, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)",
 854                         region_name(region_index), is_oopmap ? "oop" : "ptr",
 855                         p2i(bitmap_base), size_in_bits);
 856 
 857   return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits);
 858 }
 859 
 860 BitMapView FileMapInfo::oopmap_view(int region_index) {
 861     return bitmap_view(region_index, /*is_oopmap*/true);
 862   }
 863 
 864 BitMapView FileMapInfo::ptrmap_view(int region_index) {
 865   return bitmap_view(region_index, /*is_oopmap*/false);
 866 }
 867 
 868 void FileMapRegion::print(outputStream* st, int region_index) {
 869   st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index));
 870   st->print_cr("- crc:                            0x%08x", _crc);
 871   st->print_cr("- read_only:                      %d", _read_only);
 872   st->print_cr("- allow_exec:                     %d", _allow_exec);
 873   st->print_cr("- is_heap_region:                 %d", _is_heap_region);
 874   st->print_cr("- is_bitmap_region:               %d", _is_bitmap_region);
 875   st->print_cr("- mapped_from_file:               %d", _mapped_from_file);
 876   st->print_cr("- file_offset:                    0x%zx", _file_offset);
 877   st->print_cr("- mapping_offset:                 0x%zx", _mapping_offset);
 878   st->print_cr("- used:                           %zu", _used);
 879   st->print_cr("- oopmap_offset:                  0x%zx", _oopmap_offset);
 880   st->print_cr("- oopmap_size_in_bits:            %zu", _oopmap_size_in_bits);
 881   st->print_cr("- ptrmap_offset:                  0x%zx", _ptrmap_offset);
 882   st->print_cr("- ptrmap_size_in_bits:            %zu", _ptrmap_size_in_bits);
 883   st->print_cr("- mapped_base:                    " INTPTR_FORMAT, p2i(_mapped_base));
 884 }
 885 
 886 void FileMapInfo::write_region(int region, char* base, size_t size,
 887                                bool read_only, bool allow_exec) {
 888   assert(CDSConfig::is_dumping_archive(), "sanity");
 889 
 890   FileMapRegion* r = region_at(region);
 891   char* requested_base;
 892   size_t mapping_offset = 0;
 893 
 894   if (region == AOTMetaspace::bm) {
 895     requested_base = nullptr; // always null for bm region
 896   } else if (size == 0) {
 897     // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP)
 898     requested_base = nullptr;
 899   } else if (HeapShared::is_heap_region(region)) {
 900     assert(CDSConfig::is_dumping_heap(), "sanity");
 901 #if INCLUDE_CDS_JAVA_HEAP
 902     assert(!CDSConfig::is_dumping_dynamic_archive(), "must be");
 903     requested_base = (char*)ArchiveHeapWriter::requested_address();
 904     if (UseCompressedOops) {
 905       mapping_offset = (size_t)((address)requested_base - CompressedOops::base());
 906       assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be");
 907     } else {
 908       mapping_offset = 0; // not used with !UseCompressedOops
 909     }
 910 #endif // INCLUDE_CDS_JAVA_HEAP
 911   } else {
 912     char* requested_SharedBaseAddress = (char*)AOTMetaspace::requested_base_address();
 913     requested_base = ArchiveBuilder::current()->to_requested(base);
 914     assert(requested_base >= requested_SharedBaseAddress, "must be");
 915     mapping_offset = requested_base - requested_SharedBaseAddress;
 916   }
 917 
 918   r->set_file_offset(_file_offset);
 919   int crc = ClassLoader::crc32(0, base, (jint)size);
 920   if (size > 0) {
 921     aot_log_info(aot)("Shared file region (%s) %d: %8zu"
 922                    " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR
 923                    " crc 0x%08x",
 924                    region_name(region), region, size, p2i(requested_base), _file_offset, crc);
 925   } else {
 926     aot_log_info(aot)("Shared file region (%s) %d: %8zu"
 927                    " bytes", region_name(region), region, size);
 928   }
 929 
 930   r->init(region, mapping_offset, size, read_only, allow_exec, crc);
 931 
 932   if (base != nullptr) {
 933     write_bytes_aligned(base, size);
 934   }
 935 }
 936 
 937 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) {
 938   size_t size_in_bytes = map->size_in_bytes();
 939   map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes);
 940   return offset + size_in_bytes;
 941 }
 942 
 943 // The sorting code groups the objects with non-null oop/ptrs together.
 944 // Relevant bitmaps then have lots of leading and trailing zeros, which
 945 // we do not have to store.
 946 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) {
 947   BitMap::idx_t first_set = map->find_first_set_bit(0);
 948   BitMap::idx_t last_set  = map->find_last_set_bit(0);
 949   size_t old_size = map->size();
 950 
 951   // Slice and resize bitmap
 952   map->truncate(first_set, last_set + 1);
 953 
 954   assert(map->at(0), "First bit should be set");
 955   assert(map->at(map->size() - 1), "Last bit should be set");
 956   assert(map->size() <= old_size, "sanity");
 957 
 958   return first_set;
 959 }
 960 
 961 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap,
 962                                        CHeapBitMap* ac_ptrmap,
 963                                        ArchiveHeapInfo* heap_info,
 964                                        size_t &size_in_bytes) {
 965   size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap);
 966   size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap);
 967   header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros);
 968   header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros);
 969   size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes() + ac_ptrmap->size_in_bytes();
 970 
 971   if (heap_info->is_used()) {
 972     // Remove leading and trailing zeros
 973     size_t removed_oop_leading_zeros = remove_bitmap_zeros(heap_info->oopmap());
 974     size_t removed_ptr_leading_zeros = remove_bitmap_zeros(heap_info->ptrmap());
 975     header()->set_heap_oopmap_start_pos(removed_oop_leading_zeros);
 976     header()->set_heap_ptrmap_start_pos(removed_ptr_leading_zeros);
 977 
 978     size_in_bytes += heap_info->oopmap()->size_in_bytes();
 979     size_in_bytes += heap_info->ptrmap()->size_in_bytes();
 980   }
 981 
 982   // The bitmap region contains up to 4 parts:
 983   // rw_ptrmap:           metaspace pointers inside the read-write region
 984   // ro_ptrmap:           metaspace pointers inside the read-only region
 985   // ac_ptrmap:           metaspace pointers inside the AOT code cache region
 986   // heap_info->oopmap(): Java oop pointers in the heap region
 987   // heap_info->ptrmap(): metaspace pointers in the heap region
 988   char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared);
 989   size_t written = 0;
 990 
 991   region_at(AOTMetaspace::rw)->init_ptrmap(0, rw_ptrmap->size());
 992   written = write_bitmap(rw_ptrmap, buffer, written);
 993 
 994   region_at(AOTMetaspace::ro)->init_ptrmap(written, ro_ptrmap->size());
 995   written = write_bitmap(ro_ptrmap, buffer, written);
 996 
 997   if (ac_ptrmap->size() > 0) {
 998     region_at(AOTMetaspace::ac)->init_ptrmap(written, ac_ptrmap->size());
 999     written = write_bitmap(ac_ptrmap, buffer, written);
1000   }
1001 
1002   if (heap_info->is_used()) {
1003     FileMapRegion* r = region_at(AOTMetaspace::hp);
1004 
1005     r->init_oopmap(written, heap_info->oopmap()->size());
1006     written = write_bitmap(heap_info->oopmap(), buffer, written);
1007 
1008     r->init_ptrmap(written, heap_info->ptrmap()->size());
1009     written = write_bitmap(heap_info->ptrmap(), buffer, written);
1010   }
1011 
1012   write_region(AOTMetaspace::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false);
1013   return buffer;
1014 }
1015 
1016 size_t FileMapInfo::write_heap_region(ArchiveHeapInfo* heap_info) {
1017   char* buffer_start = heap_info->buffer_start();
1018   size_t buffer_size = heap_info->buffer_byte_size();
1019   write_region(AOTMetaspace::hp, buffer_start, buffer_size, false, false);
1020   header()->set_heap_root_segments(heap_info->heap_root_segments());
1021   return buffer_size;
1022 }
1023 
1024 // Dump bytes to file -- at the current file position.
1025 
1026 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
1027   assert(_file_open, "must be");
1028   if (!os::write(_fd, buffer, nbytes)) {
1029     // If the shared archive is corrupted, close it and remove it.
1030     close();
1031     remove(_full_path);
1032 
1033     if (CDSConfig::is_dumping_preimage_static_archive()) {
1034       AOTMetaspace::writing_error("Unable to write to AOT configuration file.");
1035     } else if (CDSConfig::new_aot_flags_used()) {
1036       AOTMetaspace::writing_error("Unable to write to AOT cache.");
1037     } else {
1038       AOTMetaspace::writing_error("Unable to write to shared archive.");
1039     }
1040   }
1041   _file_offset += nbytes;
1042 }
1043 
1044 bool FileMapInfo::is_file_position_aligned() const {
1045   return _file_offset == align_up(_file_offset,
1046                                   AOTMetaspace::core_region_alignment());
1047 }
1048 
1049 // Align file position to an allocation unit boundary.
1050 
1051 void FileMapInfo::align_file_position() {
1052   assert(_file_open, "must be");
1053   size_t new_file_offset = align_up(_file_offset,
1054                                     AOTMetaspace::core_region_alignment());
1055   if (new_file_offset != _file_offset) {
1056     _file_offset = new_file_offset;
1057     // Seek one byte back from the target and write a byte to insure
1058     // that the written file is the correct length.
1059     _file_offset -= 1;
1060     seek_to_position(_file_offset);
1061     char zero = 0;
1062     write_bytes(&zero, 1);
1063   }
1064 }
1065 
1066 
1067 // Dump bytes to file -- at the current file position.
1068 
1069 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
1070   align_file_position();
1071   write_bytes(buffer, nbytes);
1072   align_file_position();
1073 }
1074 
1075 // Close the shared archive file.  This does NOT unmap mapped regions.
1076 
1077 void FileMapInfo::close() {
1078   if (_file_open) {
1079     if (::close(_fd) < 0) {
1080       AOTMetaspace::unrecoverable_loading_error("Unable to close the shared archive file.");
1081     }
1082     _file_open = false;
1083     _fd = -1;
1084   }
1085 }
1086 
1087 /*
1088  * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled.
1089  */
1090 static char* map_memory(int fd, const char* file_name, size_t file_offset,
1091                         char *addr, size_t bytes, bool read_only,
1092                         bool allow_exec, MemTag mem_tag) {
1093   char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes,
1094                              mem_tag, AlwaysPreTouch ? false : read_only,
1095                              allow_exec);
1096   if (mem != nullptr && AlwaysPreTouch) {
1097     os::pretouch_memory(mem, mem + bytes);
1098   }
1099   return mem;
1100 }
1101 
1102 // JVM/TI RedefineClasses() support:
1103 // Remap the shared readonly space to shared readwrite, private.
1104 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1105   int idx = AOTMetaspace::ro;
1106   FileMapRegion* r = region_at(idx);
1107   if (!r->read_only()) {
1108     // the space is already readwrite so we are done
1109     return true;
1110   }
1111   size_t size = r->used_aligned();
1112   if (!open_for_read()) {
1113     return false;
1114   }
1115   char *addr = r->mapped_base();
1116   // This path should not be reached for Windows; see JDK-8222379.
1117   assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows");
1118   // Replace old mapping with new one that is writable.
1119   char *base = os::map_memory(_fd, _full_path, r->file_offset(),
1120                               addr, size, mtNone, false /* !read_only */,
1121                               r->allow_exec());
1122   close();
1123   // These have to be errors because the shared region is now unmapped.
1124   if (base == nullptr) {
1125     aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1126     vm_exit(1);
1127   }
1128   if (base != addr) {
1129     aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1130     vm_exit(1);
1131   }
1132   r->set_read_only(false);
1133   return true;
1134 }
1135 
1136 // Memory map a region in the address space.
1137 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap", "Code" };
1138 
1139 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) {
1140   DEBUG_ONLY(FileMapRegion* last_region = nullptr);
1141   intx addr_delta = mapped_base_address - header()->requested_base_address();
1142 
1143   // Make sure we don't attempt to use header()->mapped_base_address() unless
1144   // it's been successfully mapped.
1145   DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);)
1146 
1147   for (int i = 0; i < num_regions; i++) {
1148     int idx = regions[i];
1149     MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs);
1150     if (result != MAP_ARCHIVE_SUCCESS) {
1151       return result;
1152     }
1153     FileMapRegion* r = region_at(idx);
1154     DEBUG_ONLY(if (last_region != nullptr) {
1155         // Ensure that the OS won't be able to allocate new memory spaces between any mapped
1156         // regions, or else it would mess up the simple comparison in MetaspaceObj::in_aot_cache().
1157         assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps");
1158       }
1159       last_region = r;)
1160     aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic",
1161                   idx, p2i(r->mapped_base()), p2i(r->mapped_end()),
1162                   shared_region_name[idx]);
1163 
1164   }
1165 
1166   header()->set_mapped_base_address(header()->requested_base_address() + addr_delta);
1167   if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) {
1168     return MAP_ARCHIVE_OTHER_FAILURE;
1169   }
1170 
1171   return MAP_ARCHIVE_SUCCESS;
1172 }
1173 
1174 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) {
1175   FileMapRegion* r = region_at(i);
1176   if (do_commit) {
1177     aot_log_info(aot)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s",
1178                   is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size),
1179                   shared_region_name[i], r->allow_exec() ? " exec" : "");
1180     if (!os::commit_memory(base, size, r->allow_exec())) {
1181       aot_log_error(aot)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic",
1182                      i, shared_region_name[i]);
1183       return false;
1184     }
1185   }
1186   if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() ||
1187       read_bytes(base, size) != size) {
1188     return false;
1189   }
1190 
1191   if (VerifySharedSpaces && !r->check_region_crc(base)) {
1192     return false;
1193   }
1194 
1195   r->set_mapped_from_file(false);
1196   r->set_mapped_base(base);
1197 
1198   return true;
1199 }
1200 
1201 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) {
1202   assert(!HeapShared::is_heap_region(i), "sanity");
1203   FileMapRegion* r = region_at(i);
1204   size_t size = r->used_aligned();
1205   char *requested_addr = mapped_base_address + r->mapping_offset();
1206   assert(!is_mapped(), "must be not mapped yet");
1207   assert(requested_addr != nullptr, "must be specified");
1208 
1209   r->set_mapped_from_file(false);
1210   r->set_in_reserved_space(false);
1211 
1212   if (AOTMetaspace::use_windows_memory_mapping()) {
1213     // Windows cannot remap read-only shared memory to read-write when required for
1214     // RedefineClasses, which is also used by JFR.  Always map windows regions as RW.
1215     r->set_read_only(false);
1216   } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() ||
1217              Arguments::has_jfr_option()) {
1218     // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW
1219     r->set_read_only(false);
1220   } else if (addr_delta != 0) {
1221     r->set_read_only(false); // Need to patch the pointers
1222   }
1223 
1224   if (AOTMetaspace::use_windows_memory_mapping() && rs.is_reserved()) {
1225     // This is the second time we try to map the archive(s). We have already created a ReservedSpace
1226     // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows
1227     // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the
1228     // regions anyway, so there's no benefit for mmap anyway.
1229     if (!read_region(i, requested_addr, size, /* do_commit = */ true)) {
1230       AOTMetaspace::report_loading_error("Failed to read %s shared space into reserved space at " INTPTR_FORMAT,
1231                                             shared_region_name[i], p2i(requested_addr));
1232       return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error.
1233     } else {
1234       assert(r->mapped_base() != nullptr, "must be initialized");
1235     }
1236   } else {
1237     // Note that this may either be a "fresh" mapping into unreserved address
1238     // space (Windows, first mapping attempt), or a mapping into pre-reserved
1239     // space (Posix). See also comment in AOTMetaspace::map_archives().
1240     bool read_only = r->read_only() && !CDSConfig::is_dumping_final_static_archive();
1241 
1242     char* base = map_memory(_fd, _full_path, r->file_offset(),
1243                             requested_addr, size, read_only,
1244                             r->allow_exec(), mtClassShared);
1245     if (base != requested_addr) {
1246       AOTMetaspace::report_loading_error("Unable to map %s shared space at " INTPTR_FORMAT,
1247                                             shared_region_name[i], p2i(requested_addr));
1248       _memory_mapping_failed = true;
1249       return MAP_ARCHIVE_MMAP_FAILURE;
1250     }
1251 
1252     if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) {
1253       return MAP_ARCHIVE_OTHER_FAILURE;
1254     }
1255 
1256     r->set_mapped_from_file(true);
1257     r->set_mapped_base(requested_addr);
1258   }
1259 
1260   if (rs.is_reserved()) {
1261     char* mapped_base = r->mapped_base();
1262     assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(),
1263            PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT,
1264            p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end()));
1265     r->set_in_reserved_space(rs.is_reserved());
1266   }
1267   return MAP_ARCHIVE_SUCCESS;
1268 }
1269 
1270 // The return value is the location of the archive relocation bitmap.
1271 char* FileMapInfo::map_bitmap_region() {
1272   FileMapRegion* r = region_at(AOTMetaspace::bm);
1273   if (r->mapped_base() != nullptr) {
1274     return r->mapped_base();
1275   }
1276   bool read_only = true, allow_exec = false;
1277   char* requested_addr = nullptr; // allow OS to pick any location
1278   char* bitmap_base = map_memory(_fd, _full_path, r->file_offset(),
1279                                  requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared);
1280   if (bitmap_base == nullptr) {
1281     AOTMetaspace::report_loading_error("failed to map relocation bitmap");
1282     return nullptr;
1283   }
1284 
1285   if (VerifySharedSpaces && !r->check_region_crc(bitmap_base)) {
1286     aot_log_error(aot)("relocation bitmap CRC error");
1287     if (!os::unmap_memory(bitmap_base, r->used_aligned())) {
1288       fatal("os::unmap_memory of relocation bitmap failed");
1289     }
1290     return nullptr;
1291   }
1292 
1293   r->set_mapped_from_file(true);
1294   r->set_mapped_base(bitmap_base);
1295   aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1296                 is_static() ? "static " : "dynamic",
1297                 AOTMetaspace::bm, p2i(r->mapped_base()), p2i(r->mapped_end()),
1298                 shared_region_name[AOTMetaspace::bm]);
1299   return bitmap_base;
1300 }
1301 
1302 bool FileMapInfo::map_aot_code_region(ReservedSpace rs) {
1303   FileMapRegion* r = region_at(AOTMetaspace::ac);
1304   assert(r->used() > 0 && r->used_aligned() == rs.size(), "must be");
1305 
1306   char* requested_base = rs.base();
1307   assert(requested_base != nullptr, "should be inside code cache");
1308 
1309   char* mapped_base;
1310   if (AOTMetaspace::use_windows_memory_mapping()) {
1311     if (!read_region(AOTMetaspace::ac, requested_base, r->used_aligned(), /* do_commit = */ true)) {
1312       AOTMetaspace::report_loading_error("Failed to read aot code shared space into reserved space at " INTPTR_FORMAT,
1313                                             p2i(requested_base));
1314       return false;
1315     }
1316     mapped_base = requested_base;
1317   } else {
1318     // We do not execute in-place in the AOT code region.
1319     // AOT code is copied to the CodeCache for execution.
1320     bool read_only = false, allow_exec = false;
1321     mapped_base = map_memory(_fd, _full_path, r->file_offset(),
1322                              requested_base, r->used_aligned(), read_only, allow_exec, mtClassShared);
1323   }
1324   if (mapped_base == nullptr) {
1325     AOTMetaspace::report_loading_error("failed to map aot code region");
1326     return false;
1327   } else {
1328     assert(mapped_base == requested_base, "must be");
1329     r->set_mapped_from_file(true);
1330     r->set_mapped_base(mapped_base);
1331     relocate_pointers_in_aot_code_region();
1332     aot_log_info(aot)("Mapped static  region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1333                   AOTMetaspace::ac, p2i(r->mapped_base()), p2i(r->mapped_end()),
1334                   shared_region_name[AOTMetaspace::ac]);
1335     return true;
1336   }
1337 }
1338 
1339 class CachedCodeRelocator: public BitMapClosure {
1340   address _code_requested_base;
1341   address* _patch_base;
1342   intx _code_delta;
1343   intx _metadata_delta;
1344 
1345 public:
1346   CachedCodeRelocator(address code_requested_base, address code_mapped_base,
1347                       intx metadata_delta) {
1348     _code_requested_base = code_requested_base;
1349     _patch_base = (address*)code_mapped_base;
1350     _code_delta = code_mapped_base - code_requested_base;
1351     _metadata_delta = metadata_delta;
1352   }
1353 
1354   bool do_bit(size_t offset) {
1355     address* p = _patch_base + offset;
1356     address requested_ptr = *p;
1357     if (requested_ptr < _code_requested_base) {
1358       *p = requested_ptr + _metadata_delta;
1359     } else {
1360       *p = requested_ptr + _code_delta;
1361     }
1362     return true; // keep iterating
1363   }
1364 };
1365 
1366 void FileMapInfo::relocate_pointers_in_aot_code_region() {
1367   FileMapRegion* r = region_at(AOTMetaspace::ac);
1368   char* bitmap_base = map_bitmap_region();
1369 
1370   BitMapView ac_ptrmap = ptrmap_view(AOTMetaspace::ac);
1371   if (ac_ptrmap.size() == 0) {
1372     return;
1373   }
1374 
1375   address core_regions_requested_base = (address)header()->requested_base_address();
1376   address core_regions_mapped_base = (address)header()->mapped_base_address();
1377   address ac_region_requested_base = core_regions_requested_base + r->mapping_offset();
1378   address ac_region_mapped_base = (address)r->mapped_base();
1379 
1380   size_t max_bits_for_core_regions = pointer_delta(mapped_end(), mapped_base(), // FIXME - renamed to core_regions_mapped_base(), etc
1381                                                    sizeof(address));
1382 
1383   CachedCodeRelocator patcher(ac_region_requested_base, ac_region_mapped_base,
1384                               core_regions_mapped_base - core_regions_requested_base);
1385   ac_ptrmap.iterate(&patcher);
1386 }
1387 
1388 class SharedDataRelocationTask : public ArchiveWorkerTask {
1389 private:
1390   BitMapView* const _rw_bm;
1391   BitMapView* const _ro_bm;
1392   SharedDataRelocator* const _rw_reloc;
1393   SharedDataRelocator* const _ro_reloc;
1394 
1395 public:
1396   SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) :
1397                            ArchiveWorkerTask("Shared Data Relocation"),
1398                            _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {}
1399 
1400   void work(int chunk, int max_chunks) override {
1401     work_on(chunk, max_chunks, _rw_bm, _rw_reloc);
1402     work_on(chunk, max_chunks, _ro_bm, _ro_reloc);
1403   }
1404 
1405   void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) {
1406     BitMap::idx_t size  = bm->size();
1407     BitMap::idx_t start = MIN2(size, size * chunk / max_chunks);
1408     BitMap::idx_t end   = MIN2(size, size * (chunk + 1) / max_chunks);
1409     assert(end > start, "Sanity: no empty slices");
1410     bm->iterate(reloc, start, end);
1411   }
1412 };
1413 
1414 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000).
1415 // We relocate all pointers in the 2 core regions (ro, rw).
1416 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) {
1417   aot_log_debug(aot, reloc)("runtime archive relocation start");
1418   char* bitmap_base = map_bitmap_region();
1419 
1420   if (bitmap_base == nullptr) {
1421     return false; // OOM, or CRC check failure
1422   } else {
1423     BitMapView rw_ptrmap = ptrmap_view(AOTMetaspace::rw);
1424     BitMapView ro_ptrmap = ptrmap_view(AOTMetaspace::ro);
1425 
1426     FileMapRegion* rw_region = first_core_region();
1427     FileMapRegion* ro_region = last_core_region();
1428 
1429     // Patch all pointers inside the RW region
1430     address rw_patch_base = (address)rw_region->mapped_base();
1431     address rw_patch_end  = (address)rw_region->mapped_end();
1432 
1433     // Patch all pointers inside the RO region
1434     address ro_patch_base = (address)ro_region->mapped_base();
1435     address ro_patch_end  = (address)ro_region->mapped_end();
1436 
1437     // the current value of the pointers to be patched must be within this
1438     // range (i.e., must be between the requested base address and the address of the current archive).
1439     // Note: top archive may point to objects in the base archive, but not the other way around.
1440     address valid_old_base = (address)header()->requested_base_address();
1441     address valid_old_end  = valid_old_base + mapping_end_offset();
1442 
1443     // after patching, the pointers must point inside this range
1444     // (the requested location of the archive, as mapped at runtime).
1445     address valid_new_base = (address)header()->mapped_base_address();
1446     address valid_new_end  = (address)mapped_end();
1447 
1448     SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end,
1449                                 valid_new_base, valid_new_end, addr_delta);
1450     SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end,
1451                                 valid_new_base, valid_new_end, addr_delta);
1452 
1453     if (AOTCacheParallelRelocation) {
1454       ArchiveWorkers workers;
1455       SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher);
1456       workers.run_task(&task);
1457     } else {
1458       rw_ptrmap.iterate(&rw_patcher);
1459       ro_ptrmap.iterate(&ro_patcher);
1460     }
1461 
1462     // The AOTMetaspace::bm region will be unmapped in AOTMetaspace::initialize_shared_spaces().
1463 
1464     aot_log_debug(aot, reloc)("runtime archive relocation done");
1465     return true;
1466   }
1467 }
1468 
1469 size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
1470   assert(_file_open, "Archive file is not open");
1471   size_t n = ::read(_fd, buffer, (unsigned int)count);
1472   if (n != count) {
1473     // Close the file if there's a problem reading it.
1474     close();
1475     return 0;
1476   }
1477   _file_offset += count;
1478   return count;
1479 }
1480 
1481 // Get the total size in bytes of a read only region
1482 size_t FileMapInfo::readonly_total() {
1483   size_t total = 0;
1484   if (current_info() != nullptr) {
1485     FileMapRegion* r = FileMapInfo::current_info()->region_at(AOTMetaspace::ro);
1486     if (r->read_only()) total += r->used();
1487   }
1488   if (dynamic_info() != nullptr) {
1489     FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(AOTMetaspace::ro);
1490     if (r->read_only()) total += r->used();
1491   }
1492   return total;
1493 }
1494 
1495 #if INCLUDE_CDS_JAVA_HEAP
1496 MemRegion FileMapInfo::_mapped_heap_memregion;
1497 
1498 bool FileMapInfo::has_heap_region() {
1499   return (region_at(AOTMetaspace::hp)->used() > 0);
1500 }
1501 
1502 // Returns the address range of the archived heap region computed using the
1503 // current oop encoding mode. This range may be different than the one seen at
1504 // dump time due to encoding mode differences. The result is used in determining
1505 // if/how these regions should be relocated at run time.
1506 MemRegion FileMapInfo::get_heap_region_requested_range() {
1507   FileMapRegion* r = region_at(AOTMetaspace::hp);
1508   size_t size = r->used();
1509   assert(size > 0, "must have non-empty heap region");
1510 
1511   address start = heap_region_requested_address();
1512   address end = start + size;
1513   aot_log_info(aot)("Requested heap region [" INTPTR_FORMAT " - " INTPTR_FORMAT "] = %8zu bytes",
1514                 p2i(start), p2i(end), size);
1515 
1516   return MemRegion((HeapWord*)start, (HeapWord*)end);
1517 }
1518 
1519 void FileMapInfo::map_or_load_heap_region() {
1520   bool success = false;
1521 
1522   if (can_use_heap_region()) {
1523     if (ArchiveHeapLoader::can_map()) {
1524       success = map_heap_region();
1525     } else if (ArchiveHeapLoader::can_load()) {
1526       success = ArchiveHeapLoader::load_heap_region(this);
1527     } else {
1528       if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) {
1529         AOTMetaspace::report_loading_error("Cannot use CDS heap data. Selected GC not compatible -XX:-UseCompressedOops");
1530       } else {
1531         AOTMetaspace::report_loading_error("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC, UseParallelGC, or UseShenandoahGC are required.");
1532       }
1533     }
1534   }
1535 
1536   if (!success) {
1537     if (CDSConfig::is_using_aot_linked_classes() && !CDSConfig::is_dumping_final_static_archive()) {
1538       // It's too late to recover -- we have already committed to use the archived metaspace objects, but
1539       // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that
1540       // all AOT-linked classes are visible.
1541       //
1542       // We get here because the heap is too small. The app will fail anyway. So let's quit.
1543       aot_log_error(aot)("%s has aot-linked classes but the archived "
1544                      "heap objects cannot be loaded. Try increasing your heap size.",
1545                      CDSConfig::type_of_archive_being_loaded());
1546       AOTMetaspace::unrecoverable_loading_error();
1547     }
1548     CDSConfig::stop_using_full_module_graph("archive heap loading failed");
1549   }
1550 }
1551 
1552 bool FileMapInfo::can_use_heap_region() {
1553   if (!has_heap_region()) {
1554     return false;
1555   }
1556   if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1557     ShouldNotReachHere(); // CDS should have been disabled.
1558     // The archived objects are mapped at JVM start-up, but we don't know if
1559     // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook,
1560     // which would make the archived String or mirror objects invalid. Let's be safe and not
1561     // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage.
1562     //
1563     // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects
1564     // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK
1565     // because we won't install an archived object subgraph if the klass of any of the
1566     // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph().
1567   }
1568 
1569   // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of
1570   // ArchiveBuilder::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see
1571   // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must
1572   // hold:
1573   address archive_narrow_klass_base = (address)header()->mapped_base_address();
1574   const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits();
1575   const int archive_narrow_klass_shift = header()->narrow_klass_shift();
1576 
1577   aot_log_info(aot)("CDS archive was created with max heap size = %zuM, and the following configuration:",
1578                 max_heap_size()/M);
1579   aot_log_info(aot)("    narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1580                 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift);
1581   aot_log_info(aot)("    narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1582                 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
1583   aot_log_info(aot)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu",
1584                 MaxHeapSize/M, G1HeapRegion::GrainBytes);
1585   aot_log_info(aot)("    narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1586                 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift());
1587   aot_log_info(aot)("    narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1588                 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift());
1589   aot_log_info(aot)("    heap range = [" PTR_FORMAT " - "  PTR_FORMAT "]",
1590                 UseCompressedOops ? p2i(CompressedOops::begin()) :
1591                                     UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L,
1592                 UseCompressedOops ? p2i(CompressedOops::end()) :
1593                                     UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L);
1594 
1595   int err = 0;
1596   if ( archive_narrow_klass_base != CompressedKlassPointers::base() ||
1597        (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) ||
1598        (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) {
1599     stringStream ss;
1600     switch (err) {
1601     case 0:
1602       ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")",
1603                p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base));
1604       break;
1605     case 1:
1606       ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)",
1607                CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits);
1608       break;
1609     case 2:
1610       ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)",
1611                CompressedKlassPointers::shift(), archive_narrow_klass_shift);
1612       break;
1613     default:
1614       ShouldNotReachHere();
1615     };
1616     if (CDSConfig::new_aot_flags_used()) {
1617       LogTarget(Info, aot) lt;
1618       if (lt.is_enabled()) {
1619         LogStream ls(lt);
1620         ls.print_raw(ss.base());
1621         header()->print(&ls);
1622       }
1623     } else {
1624       LogTarget(Info, cds) lt;
1625       if (lt.is_enabled()) {
1626         LogStream ls(lt);
1627         ls.print_raw(ss.base());
1628         header()->print(&ls);
1629       }
1630     }
1631     assert(false, "%s", ss.base());
1632   }
1633 
1634   return true;
1635 }
1636 
1637 // The actual address of this region during dump time.
1638 address FileMapInfo::heap_region_dumptime_address() {
1639   FileMapRegion* r = region_at(AOTMetaspace::hp);
1640   assert(CDSConfig::is_using_archive(), "runtime only");
1641   assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1642   if (UseCompressedOops) {
1643     return /*dumptime*/ (address)((uintptr_t)narrow_oop_base() + r->mapping_offset());
1644   } else {
1645     return heap_region_requested_address();
1646   }
1647 }
1648 
1649 // The address where this region can be mapped into the runtime heap without
1650 // patching any of the pointers that are embedded in this region.
1651 address FileMapInfo::heap_region_requested_address() {
1652   assert(CDSConfig::is_using_archive(), "runtime only");
1653   FileMapRegion* r = region_at(AOTMetaspace::hp);
1654   assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1655   assert(ArchiveHeapLoader::can_use(), "GC must support mapping or loading");
1656   if (UseCompressedOops) {
1657     // We can avoid relocation if each region's offset from the runtime CompressedOops::base()
1658     // is the same as its offset from the CompressedOops::base() during dumptime.
1659     // Note that CompressedOops::base() may be different between dumptime and runtime.
1660     //
1661     // Example:
1662     // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a
1663     // narrowOop P stored in this region that points to an object at address 0x2200.
1664     // P's encoded value is 0x1200.
1665     //
1666     // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then
1667     // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200,
1668     // which is the runtime location of the referenced object.
1669     return /*runtime*/ (address)((uintptr_t)CompressedOops::base() + r->mapping_offset());
1670   } else {
1671     // This was the hard-coded requested base address used at dump time. With uncompressed oops,
1672     // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter
1673     // what base address was picked at duump time.
1674     return (address)ArchiveHeapWriter::NOCOOPS_REQUESTED_BASE;
1675   }
1676 }
1677 
1678 bool FileMapInfo::map_heap_region() {
1679   if (map_heap_region_impl()) {
1680 #ifdef ASSERT
1681     // The "old" regions must be parsable -- we cannot have any unused space
1682     // at the start of the lowest G1 region that contains archived objects.
1683     assert(is_aligned(_mapped_heap_memregion.start(), G1HeapRegion::GrainBytes), "must be");
1684 
1685     // Make sure we map at the very top of the heap - see comments in
1686     // init_heap_region_relocation().
1687     MemRegion heap_range = G1CollectedHeap::heap()->reserved();
1688     assert(heap_range.contains(_mapped_heap_memregion), "must be");
1689 
1690     address heap_end = (address)heap_range.end();
1691     address mapped_heap_region_end = (address)_mapped_heap_memregion.end();
1692     assert(heap_end >= mapped_heap_region_end, "must be");
1693     assert(heap_end - mapped_heap_region_end < (intx)(G1HeapRegion::GrainBytes),
1694            "must be at the top of the heap to avoid fragmentation");
1695 #endif
1696 
1697     ArchiveHeapLoader::set_mapped();
1698     return true;
1699   } else {
1700     return false;
1701   }
1702 }
1703 
1704 bool FileMapInfo::map_heap_region_impl() {
1705   assert(UseG1GC, "the following code assumes G1");
1706 
1707   FileMapRegion* r = region_at(AOTMetaspace::hp);
1708   size_t size = r->used();
1709   if (size == 0) {
1710     return false; // no archived java heap data
1711   }
1712 
1713   size_t word_size = size / HeapWordSize;
1714   address requested_start = heap_region_requested_address();
1715 
1716   aot_log_info(aot)("Preferred address to map heap data (to avoid relocation) is " INTPTR_FORMAT, p2i(requested_start));
1717 
1718   // allocate from java heap
1719   HeapWord* start = G1CollectedHeap::heap()->alloc_archive_region(word_size, (HeapWord*)requested_start);
1720   if (start == nullptr) {
1721     AOTMetaspace::report_loading_error("UseSharedSpaces: Unable to allocate java heap region for archive heap.");
1722     return false;
1723   }
1724 
1725   _mapped_heap_memregion = MemRegion(start, word_size);
1726 
1727   // Map the archived heap data. No need to call MemTracker::record_virtual_memory_tag()
1728   // for mapped region as it is part of the reserved java heap, which is already recorded.
1729   char* addr = (char*)_mapped_heap_memregion.start();
1730   char* base;
1731 
1732   if (AOTMetaspace::use_windows_memory_mapping() || UseLargePages) {
1733     // With UseLargePages, memory mapping may fail on some OSes if the size is not
1734     // large page aligned, so let's use read() instead. In this case, the memory region
1735     // is already commited by G1 so we don't need to commit it again.
1736     if (!read_region(AOTMetaspace::hp, addr,
1737                      align_up(_mapped_heap_memregion.byte_size(), os::vm_page_size()),
1738                      /* do_commit = */ !UseLargePages)) {
1739       dealloc_heap_region();
1740       aot_log_error(aot)("Failed to read archived heap region into " INTPTR_FORMAT, p2i(addr));
1741       return false;
1742     }
1743     // Checks for VerifySharedSpaces is already done inside read_region()
1744     base = addr;
1745   } else {
1746     base = map_memory(_fd, _full_path, r->file_offset(),
1747                       addr, _mapped_heap_memregion.byte_size(), r->read_only(),
1748                       r->allow_exec(), mtJavaHeap);
1749     if (base == nullptr || base != addr) {
1750       dealloc_heap_region();
1751       AOTMetaspace::report_loading_error("UseSharedSpaces: Unable to map at required address in java heap. "
1752                                             INTPTR_FORMAT ", size = %zu bytes",
1753                                             p2i(addr), _mapped_heap_memregion.byte_size());
1754       return false;
1755     }
1756 
1757     if (VerifySharedSpaces && !r->check_region_crc(base)) {
1758       dealloc_heap_region();
1759       AOTMetaspace::report_loading_error("UseSharedSpaces: mapped heap region is corrupt");
1760       return false;
1761     }
1762   }
1763 
1764   r->set_mapped_base(base);
1765 
1766   // If the requested range is different from the range allocated by GC, then
1767   // the pointers need to be patched.
1768   address mapped_start = (address) _mapped_heap_memregion.start();
1769   ptrdiff_t delta = mapped_start - requested_start;
1770   if (UseCompressedOops &&
1771       (narrow_oop_mode() != CompressedOops::mode() ||
1772        narrow_oop_shift() != CompressedOops::shift())) {
1773     _heap_pointers_need_patching = true;
1774   }
1775   if (delta != 0) {
1776     _heap_pointers_need_patching = true;
1777   }
1778   ArchiveHeapLoader::init_mapped_heap_info(mapped_start, delta, narrow_oop_shift());
1779 
1780   if (_heap_pointers_need_patching) {
1781     char* bitmap_base = map_bitmap_region();
1782     if (bitmap_base == nullptr) {
1783       AOTMetaspace::report_loading_error("CDS heap cannot be used because bitmap region cannot be mapped");
1784       dealloc_heap_region();
1785       _heap_pointers_need_patching = false;
1786       return false;
1787     }
1788   }
1789   aot_log_info(aot)("Heap data mapped at " INTPTR_FORMAT ", size = %8zu bytes",
1790                 p2i(mapped_start), _mapped_heap_memregion.byte_size());
1791   aot_log_info(aot)("CDS heap data relocation delta = %zd bytes", delta);
1792   return true;
1793 }
1794 
1795 narrowOop FileMapInfo::encoded_heap_region_dumptime_address() {
1796   assert(CDSConfig::is_using_archive(), "runtime only");
1797   assert(UseCompressedOops, "sanity");
1798   FileMapRegion* r = region_at(AOTMetaspace::hp);
1799   return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift());
1800 }
1801 
1802 void FileMapInfo::patch_heap_embedded_pointers() {
1803   if (!ArchiveHeapLoader::is_mapped() || !_heap_pointers_need_patching) {
1804     return;
1805   }
1806 
1807   char* bitmap_base = map_bitmap_region();
1808   assert(bitmap_base != nullptr, "must have already been mapped");
1809 
1810   FileMapRegion* r = region_at(AOTMetaspace::hp);
1811   ArchiveHeapLoader::patch_embedded_pointers(
1812       this, _mapped_heap_memregion,
1813       (address)(region_at(AOTMetaspace::bm)->mapped_base()) + r->oopmap_offset(),
1814       r->oopmap_size_in_bits());
1815 }
1816 
1817 void FileMapInfo::fixup_mapped_heap_region() {
1818   if (ArchiveHeapLoader::is_mapped()) {
1819     assert(!_mapped_heap_memregion.is_empty(), "sanity");
1820 
1821     // Populate the archive regions' G1BlockOffsetTables. That ensures
1822     // fast G1BlockOffsetTable::block_start operations for any given address
1823     // within the archive regions when trying to find start of an object
1824     // (e.g. during card table scanning).
1825     G1CollectedHeap::heap()->populate_archive_regions_bot(_mapped_heap_memregion);
1826   }
1827 }
1828 
1829 // dealloc the archive regions from java heap
1830 void FileMapInfo::dealloc_heap_region() {
1831   G1CollectedHeap::heap()->dealloc_archive_regions(_mapped_heap_memregion);
1832 }
1833 #endif // INCLUDE_CDS_JAVA_HEAP
1834 
1835 void FileMapInfo::unmap_regions(int regions[], int num_regions) {
1836   for (int r = 0; r < num_regions; r++) {
1837     int idx = regions[r];
1838     unmap_region(idx);
1839   }
1840 }
1841 
1842 // Unmap a memory region in the address space.
1843 
1844 void FileMapInfo::unmap_region(int i) {
1845   FileMapRegion* r = region_at(i);
1846   char* mapped_base = r->mapped_base();
1847   size_t size = r->used_aligned();
1848 
1849   if (mapped_base != nullptr) {
1850     if (size > 0 && r->mapped_from_file()) {
1851       aot_log_info(aot)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base),
1852                     shared_region_name[i]);
1853       if (r->in_reserved_space()) {
1854         // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace
1855         // is released. Zero it so that we don't accidentally read its content.
1856         aot_log_info(aot)("Region #%d (%s) is in a reserved space, it will be freed when the space is released", i, shared_region_name[i]);
1857       } else {
1858         if (!os::unmap_memory(mapped_base, size)) {
1859           fatal("os::unmap_memory failed");
1860         }
1861       }
1862     }
1863     r->set_mapped_base(nullptr);
1864   }
1865 }
1866 
1867 void FileMapInfo::assert_mark(bool check) {
1868   if (!check) {
1869     AOTMetaspace::unrecoverable_loading_error("Mark mismatch while restoring from shared file.");
1870   }
1871 }
1872 
1873 FileMapInfo* FileMapInfo::_current_info = nullptr;
1874 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr;
1875 bool FileMapInfo::_heap_pointers_need_patching = false;
1876 bool FileMapInfo::_memory_mapping_failed = false;
1877 
1878 // Open the shared archive file, read and validate the header
1879 // information (version, boot classpath, etc.). If initialization
1880 // fails, shared spaces are disabled and the file is closed.
1881 //
1882 // Validation of the archive is done in two steps:
1883 //
1884 // [1] validate_header() - done here.
1885 // [2] validate_shared_path_table - this is done later, because the table is in the RO
1886 //     region of the archive, which is not mapped yet.
1887 bool FileMapInfo::open_as_input() {
1888   assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected.");
1889   assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build.");
1890 
1891   if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1892     // CDS assumes that no classes resolved in vmClasses::resolve_all()
1893     // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved
1894     // during the JVMTI "early" stage, so we can still use CDS if
1895     // JvmtiExport::has_early_class_hook_env() is false.
1896     AOTMetaspace::report_loading_error("CDS is disabled because early JVMTI ClassFileLoadHook is in use.");
1897     return false;
1898   }
1899 
1900   if (!open_for_read() || !init_from_file(_fd) || !validate_header()) {
1901     if (_is_static) {
1902       AOTMetaspace::report_loading_error("Loading static archive failed.");
1903       return false;
1904     } else {
1905       AOTMetaspace::report_loading_error("Loading dynamic archive failed.");
1906       if (AutoCreateSharedArchive) {
1907         CDSConfig::enable_dumping_dynamic_archive(_full_path);
1908       }
1909       return false;
1910     }
1911   }
1912 
1913   return true;
1914 }
1915 
1916 bool FileMapInfo::validate_aot_class_linking() {
1917   // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap()
1918   // is available.
1919   if (header()->has_aot_linked_classes()) {
1920     const char* archive_type = CDSConfig::type_of_archive_being_loaded();
1921     CDSConfig::set_has_aot_linked_classes(true);
1922     if (JvmtiExport::should_post_class_file_load_hook()) {
1923       aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.",
1924                      archive_type);
1925       return false;
1926     }
1927     if (JvmtiExport::has_early_vmstart_env()) {
1928       aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI early vm start is in use.",
1929                      archive_type);
1930       return false;
1931     }
1932     if (!CDSConfig::is_using_full_module_graph()) {
1933       aot_log_error(aot)("%s has aot-linked classes. It cannot be used when archived full module graph is not used.",
1934                      archive_type);
1935       return false;
1936     }
1937 
1938     const char* prop = Arguments::get_property("java.security.manager");
1939     if (prop != nullptr && strcmp(prop, "disallow") != 0) {
1940       aot_log_error(aot)("%s has aot-linked classes. It cannot be used with -Djava.security.manager=%s.",
1941                      archive_type, prop);
1942       return false;
1943     }
1944 
1945     if (header()->gc_kind() != (int)Universe::heap()->kind()) {
1946       log_error(cds)("CDS archive has aot-linked classes. It cannot be used because GC used during dump time (%s) is not the same as runtime (%s)",
1947                      header()->gc_name(), Universe::heap()->name());
1948       return false;
1949     }
1950 
1951 #if INCLUDE_JVMTI
1952     if (Arguments::has_jdwp_agent()) {
1953       aot_log_error(aot)("%s has aot-linked classes. It cannot be used with JDWP agent", archive_type);
1954       return false;
1955     }
1956 #endif
1957   }
1958 
1959   return true;
1960 }
1961 
1962 // The 2 core spaces are RW->RO
1963 FileMapRegion* FileMapInfo::first_core_region() const {
1964   return region_at(AOTMetaspace::rw);
1965 }
1966 
1967 FileMapRegion* FileMapInfo::last_core_region() const {
1968   return region_at(AOTMetaspace::ro);
1969 }
1970 
1971 void FileMapInfo::print(outputStream* st) const {
1972   header()->print(st);
1973   if (!is_static()) {
1974     dynamic_header()->print(st);
1975   }
1976 }
1977 
1978 void FileMapHeader::set_as_offset(char* p, size_t *offset) {
1979   *offset = ArchiveBuilder::current()->any_to_offset((address)p);
1980 }
1981 
1982 int FileMapHeader::compute_crc() {
1983   char* start = (char*)this;
1984   // start computing from the field after _header_size to end of base archive name.
1985   char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size);
1986   size_t sz = header_size() - (buf - start);
1987   int crc = ClassLoader::crc32(0, buf, (jint)sz);
1988   return crc;
1989 }
1990 
1991 // This function should only be called during run time with UseSharedSpaces enabled.
1992 bool FileMapHeader::validate() {
1993   const char* file_type = CDSConfig::type_of_archive_being_loaded();
1994   if (_obj_alignment != ObjectAlignmentInBytes) {
1995     AOTMetaspace::report_loading_error("The %s's ObjectAlignmentInBytes of %d"
1996                                           " does not equal the current ObjectAlignmentInBytes of %d.",
1997                                           file_type, _obj_alignment, ObjectAlignmentInBytes);
1998     return false;
1999   }
2000   if (_compact_strings != CompactStrings) {
2001     AOTMetaspace::report_loading_error("The %s's CompactStrings setting (%s)"
2002                                           " does not equal the current CompactStrings setting (%s).", file_type,
2003                                           _compact_strings ? "enabled" : "disabled",
2004                                           CompactStrings   ? "enabled" : "disabled");
2005     return false;
2006   }
2007   bool jvmci_compiler_is_enabled = CompilerConfig::is_jvmci_compiler_enabled();
2008   CompilerType compiler_type = CompilerConfig::compiler_type();
2009   CompilerType archive_compiler_type = CompilerType(_compiler_type);
2010   // JVMCI compiler does different type profiling settigns and generate
2011   // different code. We can't use archive which was produced
2012   // without it and reverse.
2013   // Only allow mix when JIT compilation is disabled.
2014   // Interpreter is used by default when dumping archive.
2015   bool intepreter_is_used = (archive_compiler_type == CompilerType::compiler_none) ||
2016                             (compiler_type == CompilerType::compiler_none);
2017   if (!intepreter_is_used &&
2018       jvmci_compiler_is_enabled != (archive_compiler_type == CompilerType::compiler_jvmci)) {
2019     AOTMetaspace::report_loading_error("The %s's JIT compiler setting (%s)"
2020                                           " does not equal the current setting (%s).", file_type,
2021                                           compilertype2name(archive_compiler_type), compilertype2name(compiler_type));
2022     return false;
2023   }
2024   if (TrainingData::have_data()) {
2025     if (_type_profile_level != TypeProfileLevel) {
2026       AOTMetaspace::report_loading_error("The %s's TypeProfileLevel setting (%d)"
2027                                             " does not equal the current TypeProfileLevel setting (%d).", file_type,
2028                                             _type_profile_level, TypeProfileLevel);
2029       return false;
2030     }
2031     if (_type_profile_args_limit != TypeProfileArgsLimit) {
2032       AOTMetaspace::report_loading_error("The %s's TypeProfileArgsLimit setting (%d)"
2033                                             " does not equal the current TypeProfileArgsLimit setting (%d).", file_type,
2034                                             _type_profile_args_limit, TypeProfileArgsLimit);
2035       return false;
2036     }
2037     if (_type_profile_parms_limit != TypeProfileParmsLimit) {
2038       AOTMetaspace::report_loading_error("The %s's TypeProfileParamsLimit setting (%d)"
2039                                             " does not equal the current TypeProfileParamsLimit setting (%d).", file_type,
2040                                             _type_profile_args_limit, TypeProfileArgsLimit);
2041       return false;
2042 
2043     }
2044     if (_type_profile_width != TypeProfileWidth) {
2045       AOTMetaspace::report_loading_error("The %s's TypeProfileWidth setting (%d)"
2046                                             " does not equal the current TypeProfileWidth setting (%d).", file_type,
2047                                             (int)_type_profile_width, (int)TypeProfileWidth);
2048       return false;
2049 
2050     }
2051     if (_bci_profile_width != BciProfileWidth) {
2052       AOTMetaspace::report_loading_error("The %s's BciProfileWidth setting (%d)"
2053                                             " does not equal the current BciProfileWidth setting (%d).", file_type,
2054                                             (int)_bci_profile_width, (int)BciProfileWidth);
2055       return false;
2056     }
2057     if (_type_profile_casts != TypeProfileCasts) {
2058       AOTMetaspace::report_loading_error("The %s's TypeProfileCasts setting (%s)"
2059                                             " does not equal the current TypeProfileCasts setting (%s).", file_type,
2060                                             _type_profile_casts ? "enabled" : "disabled",
2061                                             TypeProfileCasts    ? "enabled" : "disabled");
2062 
2063       return false;
2064 
2065     }
2066     if (_profile_traps != ProfileTraps) {
2067       AOTMetaspace::report_loading_error("The %s's ProfileTraps setting (%s)"
2068                                             " does not equal the current ProfileTraps setting (%s).", file_type,
2069                                             _profile_traps ? "enabled" : "disabled",
2070                                             ProfileTraps   ? "enabled" : "disabled");
2071 
2072       return false;
2073     }
2074     if (_spec_trap_limit_extra_entries != SpecTrapLimitExtraEntries) {
2075       AOTMetaspace::report_loading_error("The %s's SpecTrapLimitExtraEntries setting (%d)"
2076                                             " does not equal the current SpecTrapLimitExtraEntries setting (%d).", file_type,
2077                                             _spec_trap_limit_extra_entries, SpecTrapLimitExtraEntries);
2078       return false;
2079 
2080     }
2081   }
2082 
2083   // This must be done after header validation because it might change the
2084   // header data
2085   const char* prop = Arguments::get_property("java.system.class.loader");
2086   if (prop != nullptr) {
2087     if (has_aot_linked_classes()) {
2088       AOTMetaspace::report_loading_error("%s has aot-linked classes. It cannot be used when the "
2089                                             "java.system.class.loader property is specified.",
2090                                             CDSConfig::type_of_archive_being_loaded());
2091       return false;
2092     }
2093     aot_log_warning(aot)("Archived non-system classes are disabled because the "
2094             "java.system.class.loader property is specified (value = \"%s\"). "
2095             "To use archived non-system classes, this property must not be set", prop);
2096     _has_platform_or_app_classes = false;
2097   }
2098 
2099 
2100   if (!_verify_local && BytecodeVerificationLocal) {
2101     //  we cannot load boot classes, so there's no point of using the CDS archive
2102     AOTMetaspace::report_loading_error("The %s's BytecodeVerificationLocal setting (%s)"
2103                                           " does not equal the current BytecodeVerificationLocal setting (%s).", file_type,
2104                                           _verify_local ? "enabled" : "disabled",
2105                                           BytecodeVerificationLocal ? "enabled" : "disabled");
2106     return false;
2107   }
2108 
2109   // For backwards compatibility, we don't check the BytecodeVerificationRemote setting
2110   // if the archive only contains system classes.
2111   if (_has_platform_or_app_classes
2112       && !_verify_remote // we didn't verify the archived platform/app classes
2113       && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes
2114     aot_log_info(aot)("The %s was created with less restrictive "
2115                                "verification setting than the current setting.", file_type);
2116     // Pretend that we didn't have any archived platform/app classes, so they won't be loaded
2117     // by SystemDictionaryShared.
2118     _has_platform_or_app_classes = false;
2119   }
2120 
2121   aot_log_info(aot)("The %s was created with UseCompressedOops = %d, UseCompressedClassPointers = %d, UseCompactObjectHeaders = %d",
2122                           file_type, compressed_oops(), compressed_class_pointers(), compact_headers());
2123   if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) {
2124     aot_log_warning(aot)("Unable to use %s.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is "
2125                                "different from runtime, CDS will be disabled.", file_type);
2126     return false;
2127   }
2128 
2129   if (compact_headers() != UseCompactObjectHeaders) {
2130     aot_log_warning(aot)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)"
2131                      " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type,
2132                      _compact_headers          ? "enabled" : "disabled",
2133                      UseCompactObjectHeaders   ? "enabled" : "disabled");
2134     return false;
2135   }
2136 
2137   if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) {
2138     CDSConfig::stop_using_optimized_module_handling();
2139     aot_log_info(aot)("optimized module handling: disabled because archive was created without optimized module handling");
2140   }
2141 
2142   if (is_static()) {
2143     // Only the static archive can contain the full module graph.
2144     if (!_has_full_module_graph) {
2145       CDSConfig::stop_using_full_module_graph("archive was created without full module graph");
2146     }
2147   }
2148 
2149   return true;
2150 }
2151 
2152 bool FileMapInfo::validate_header() {
2153   if (!header()->validate()) {
2154     return false;
2155   }
2156   if (_is_static) {
2157     return true;
2158   } else {
2159     return DynamicArchive::validate(this);
2160   }
2161 }
2162 
2163 #if INCLUDE_JVMTI
2164 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr;
2165 
2166 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) {
2167   if (i == 0) {
2168     // index 0 corresponds to the ClassPathImageEntry which is a globally shared object
2169     // and should never be deleted.
2170     return ClassLoader::get_jrt_entry();
2171   }
2172   ClassPathEntry* ent = _classpath_entries_for_jvmti[i];
2173   if (ent == nullptr) {
2174     const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i);
2175     const char* path = cl->path();
2176     struct stat st;
2177     if (os::stat(path, &st) != 0) {
2178       char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2179       jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path);
2180       THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2181     } else {
2182       ent = ClassLoader::create_class_path_entry(THREAD, path, &st);
2183       if (ent == nullptr) {
2184         char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2185         jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
2186         THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2187       }
2188     }
2189 
2190     MutexLocker mu(THREAD, CDSClassFileStream_lock);
2191     if (_classpath_entries_for_jvmti[i] == nullptr) {
2192       _classpath_entries_for_jvmti[i] = ent;
2193     } else {
2194       // Another thread has beat me to creating this entry
2195       delete ent;
2196       ent = _classpath_entries_for_jvmti[i];
2197     }
2198   }
2199 
2200   return ent;
2201 }
2202 
2203 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) {
2204   int path_index = ik->shared_classpath_index();
2205   assert(path_index >= 0, "should be called for shared built-in classes only");
2206   assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity");
2207 
2208   ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL);
2209   assert(cpe != nullptr, "must be");
2210 
2211   Symbol* name = ik->name();
2212   const char* const class_name = name->as_C_string();
2213   const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
2214                                                                       name->utf8_length());
2215   ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
2216   const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index);
2217   ClassFileStream* cfs;
2218   if (class_loader() != nullptr && cl->is_multi_release_jar()) {
2219     // This class was loaded from a multi-release JAR file during dump time. The
2220     // process for finding its classfile is complex. Let's defer to the Java code
2221     // in java.lang.ClassLoader.
2222     cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL);
2223   } else {
2224     cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data);
2225   }
2226   assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders.");
2227   log_debug(aot, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index,
2228                         cfs->source(), cfs->length());
2229   return cfs;
2230 }
2231 
2232 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader,
2233                                                            ClassPathEntry* cpe,
2234                                                            const char* file_name,
2235                                                            TRAPS) {
2236   JavaValue result(T_OBJECT);
2237   oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD);
2238   Handle h_class_name = Handle(THREAD, class_name);
2239 
2240   // byte[] ClassLoader.getResourceAsByteArray(String name)
2241   JavaCalls::call_virtual(&result,
2242                           class_loader,
2243                           vmClasses::ClassLoader_klass(),
2244                           vmSymbols::getResourceAsByteArray_name(),
2245                           vmSymbols::getResourceAsByteArray_signature(),
2246                           h_class_name,
2247                           CHECK_NULL);
2248   assert(result.get_type() == T_OBJECT, "just checking");
2249   oop obj = result.get_oop();
2250   assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null");
2251 
2252   // copy from byte[] to a buffer
2253   typeArrayOop ba = typeArrayOop(obj);
2254   jint len = ba->length();
2255   u1* buffer = NEW_RESOURCE_ARRAY(u1, len);
2256   ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len);
2257 
2258   return new ClassFileStream(buffer, len, cpe->name());
2259 }
2260 #endif