1 /*
  2  * Copyright (c) 2003, 2020, 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 #ifndef SHARE_MEMORY_FILEMAP_HPP
 26 #define SHARE_MEMORY_FILEMAP_HPP
 27 
 28 #include "classfile/classLoader.hpp"
 29 #include "include/cds.h"
 30 #include "memory/metaspaceShared.hpp"
 31 #include "memory/metaspace.hpp"
 32 #include "oops/compressedOops.hpp"
 33 #include "utilities/align.hpp"
 34 
 35 // Layout of the file:
 36 //  header: dump of archive instance plus versioning info, datestamp, etc.
 37 //   [magic # = 0xF00BABA2]
 38 //  ... padding to align on page-boundary
 39 //  read-write space
 40 //  read-only space
 41 //  misc data (block offset table, string table, symbols, dictionary, etc.)
 42 //  tag(666)
 43 
 44 static const int JVM_IDENT_MAX = 256;
 45 
 46 class CHeapBitMap;
 47 
 48 class SharedClassPathEntry {
 49   enum {
 50     modules_image_entry,
 51     jar_entry,
 52     signed_jar_entry,
 53     dir_entry,
 54     non_existent_entry,
 55     unknown_entry
 56   };
 57 
 58   void set_name(const char* name, TRAPS);
 59 
 60   u1     _type;
 61   bool   _is_module_path;
 62   bool   _from_class_path_attr;
 63   time_t _timestamp;          // jar timestamp,  0 if is directory, modules image or other
 64   int64_t      _filesize;     // jar/jimage file size, -1 if is directory, -2 if other
 65   Array<char>* _name;
 66   Array<u1>*   _manifest;
 67 
 68 public:
 69   void init(bool is_modules_image, bool is_module_path, ClassPathEntry* cpe, TRAPS);
 70   void init_as_non_existent(const char* path, TRAPS);
 71   void metaspace_pointers_do(MetaspaceClosure* it);
 72   bool validate(bool is_class_path = true) const;
 73 
 74   // The _timestamp only gets set for jar files.
 75   bool has_timestamp() const {
 76     return _timestamp != 0;
 77   }
 78   bool is_dir()           const { return _type == dir_entry; }
 79   bool is_modules_image() const { return _type == modules_image_entry; }
 80   bool is_jar()           const { return _type == jar_entry; }
 81   bool is_signed()        const { return _type == signed_jar_entry; }
 82   void set_is_signed() {
 83     _type = signed_jar_entry;
 84   }
 85   bool from_class_path_attr() { return _from_class_path_attr; }
 86   time_t timestamp() const { return _timestamp; }
 87   const char* name() const;
 88   const char* manifest() const {
 89     return (_manifest == NULL) ? NULL : (const char*)_manifest->data();
 90   }
 91   int manifest_size() const {
 92     return (_manifest == NULL) ? 0 : _manifest->length();
 93   }
 94   void set_manifest(Array<u1>* manifest) {
 95     _manifest = manifest;
 96   }
 97   bool check_non_existent() const;
 98   void copy_from(SharedClassPathEntry* ent, ClassLoaderData* loader_data, TRAPS);
 99   bool in_named_module() {
100     return is_modules_image() || // modules image doesn't contain unnamed modules
101            _is_module_path;      // module path doesn't contain unnamed modules
102   }
103 };
104 
105 struct ArchiveHeapOopmapInfo {
106   address _oopmap;               // bitmap for relocating embedded oops
107   size_t  _offset;               // this oopmap is stored at this offset from the bottom of the BM region
108   size_t  _oopmap_size_in_bits;
109   size_t  _oopmap_size_in_bytes;
110 };
111 
112 class SharedPathTable {
113   Array<u8>* _table;
114   int _size;
115 public:
116   SharedPathTable() : _table(NULL), _size(0) {}
117   SharedPathTable(Array<u8>* table, int size) : _table(table), _size(size) {}
118 
119   void dumptime_init(ClassLoaderData* loader_data, Thread* THREAD);
120   void metaspace_pointers_do(MetaspaceClosure* it);
121 
122   int size() {
123     return _size;
124   }
125   SharedClassPathEntry* path_at(int index) {
126     if (index < 0) {
127       return NULL;
128     }
129     assert(index < _size, "sanity");
130     char* p = (char*)_table->data();
131     p += sizeof(SharedClassPathEntry) * index;
132     return (SharedClassPathEntry*)p;
133   }
134   Array<u8>* table() {return _table;}
135   void set_table(Array<u8>* table) {_table = table;}
136 };
137 
138 
139 class FileMapRegion: private CDSFileMapRegion {
140   void assert_is_heap_region() const {
141     assert(_is_heap_region, "must be heap region");
142   }
143   void assert_is_not_heap_region() const {
144     assert(!_is_heap_region, "must not be heap region");
145   }
146 
147 public:
148   static FileMapRegion* cast(CDSFileMapRegion* p) {
149     return (FileMapRegion*)p;
150   }
151 
152   // Accessors
153   int crc()                         const { return _crc; }
154   size_t file_offset()              const { return _file_offset; }
155   size_t mapping_offset()           const { return _mapping_offset; }
156   size_t mapping_end_offset()       const { return _mapping_offset + used_aligned(); }
157   size_t used()                     const { return _used; }
158   size_t used_aligned()             const; // aligned up to os::vm_allocation_granularity()
159   char*  mapped_base()              const { assert_is_not_heap_region(); return _mapped_base; }
160   char*  mapped_end()               const { return mapped_base()        + used_aligned(); }
161   bool   read_only()                const { return _read_only != 0; }
162   bool   allow_exec()               const { return _allow_exec != 0; }
163   bool   mapped_from_file()         const { return _mapped_from_file != 0; }
164   size_t oopmap_offset()            const { assert_is_heap_region();     return _oopmap_offset; }
165   size_t oopmap_size_in_bits()      const { assert_is_heap_region();     return _oopmap_size_in_bits; }
166 
167   void set_file_offset(size_t s)     { _file_offset = s; }
168   void set_read_only(bool v)         { _read_only = v; }
169   void set_mapped_base(char* p)      { _mapped_base = p; }
170   void set_mapped_from_file(bool v)  { _mapped_from_file = v; }
171   void init(int region_index, char* base, size_t size, bool read_only,
172             bool allow_exec, int crc);
173 
174   void init_oopmap(size_t oopmap_offset, size_t size_in_bits) {
175     _oopmap_offset = oopmap_offset;
176     _oopmap_size_in_bits = size_in_bits;
177   }
178 };
179 
180 class FileMapHeader: private CDSFileMapHeaderBase {
181   friend class CDSOffsets;
182   friend class VMStructs;
183 
184   size_t _header_size;
185 
186   // The following fields record the states of the VM during dump time.
187   // They are compared with the runtime states to see if the archive
188   // can be used.
189   size_t _alignment;                // how shared archive should be aligned
190   int    _obj_alignment;            // value of ObjectAlignmentInBytes
191   address _narrow_oop_base;         // compressed oop encoding base
192   int    _narrow_oop_shift;         // compressed oop encoding shift
193   bool   _compact_strings;          // value of CompactStrings
194   uintx  _max_heap_size;            // java max heap size during dumping
195   CompressedOops::Mode _narrow_oop_mode; // compressed oop encoding mode
196   int     _narrow_klass_shift;      // save narrow klass base and shift
197   bool    _compressed_oops;         // save the flag UseCompressedOops
198   bool    _compressed_class_ptrs;   // save the flag UseCompressedClassPointers
199   size_t  _cloned_vtables_offset;   // The address of the first cloned vtable
200   size_t  _serialized_data_offset;  // Data accessed using {ReadClosure,WriteClosure}::serialize()
201   size_t  _i2i_entry_code_buffers_offset;
202   size_t  _i2i_entry_code_buffers_size;
203   address _heap_end;                // heap end at dump time.
204   bool _base_archive_is_default;    // indicates if the base archive is the system default one
205 
206   // The following fields are all sanity checks for whether this archive
207   // will function correctly with this JVM and the bootclasspath it's
208   // invoked with.
209   char  _jvm_ident[JVM_IDENT_MAX];  // identifier string of the jvm that created this dump
210 
211   // size of the base archive name including NULL terminator
212   size_t _base_archive_name_size;
213 
214   // The following is a table of all the boot/app/module path entries that were used
215   // during dumping. At run time, we validate these entries according to their
216   // SharedClassPathEntry::_type. See:
217   //      check_nonempty_dir_in_shared_path_table()
218   //      validate_shared_path_table()
219   //      validate_non_existent_class_paths()
220   size_t _shared_path_table_offset;
221   int    _shared_path_table_size;
222 
223   jshort _app_class_paths_start_index;  // Index of first app classpath entry
224   jshort _app_module_paths_start_index; // Index of first module path entry
225   jshort _num_module_paths;             // number of module path entries
226   jshort _max_used_path_index;          // max path index referenced during CDS dump
227   bool   _verify_local;                 // BytecodeVerificationLocal setting
228   bool   _verify_remote;                // BytecodeVerificationRemote setting
229   bool   _has_platform_or_app_classes;  // Archive contains app classes
230   char*  _requested_base_address;       // Archive relocation is not necessary if we map with this base address.
231   char*  _mapped_base_address;          // Actual base address where archive is mapped.
232 
233   bool   _allow_archiving_with_java_agent; // setting of the AllowArchivingWithJavaAgent option
234   bool   _use_optimized_module_handling;// No module-relation VM options were specified, so we can skip
235                                         // some expensive operations.
236   bool   _use_full_module_graph;        // Can we use the full archived module graph?
237   size_t _ptrmap_size_in_bits;          // Size of pointer relocation bitmap
238 
239   char* from_mapped_offset(size_t offset) const {
240     return mapped_base_address() + offset;
241   }
242   void set_mapped_offset(char* p, size_t *offset) {
243     assert(p >= mapped_base_address(), "sanity");
244     *offset = p - mapped_base_address();
245   }
246 public:
247   // Accessors -- fields declared in CDSFileMapHeaderBase
248   unsigned int magic() const {return _magic;}
249   int crc()                               const { return _crc; }
250   int version()                           const { return _version; }
251 
252   void set_crc(int crc_value)                   { _crc = crc_value; }
253   void set_version(int v)                       { _version = v; }
254 
255   // Accessors -- fields declared in FileMapHeader
256 
257   size_t header_size()                     const { return _header_size; }
258   size_t alignment()                       const { return _alignment; }
259   int obj_alignment()                      const { return _obj_alignment; }
260   address narrow_oop_base()                const { return _narrow_oop_base; }
261   int narrow_oop_shift()                   const { return _narrow_oop_shift; }
262   bool compact_strings()                   const { return _compact_strings; }
263   uintx max_heap_size()                    const { return _max_heap_size; }
264   CompressedOops::Mode narrow_oop_mode()   const { return _narrow_oop_mode; }
265   int narrow_klass_shift()                 const { return _narrow_klass_shift; }
266   address narrow_klass_base()              const { return (address)mapped_base_address(); }
267   char* cloned_vtables()                   const { return from_mapped_offset(_cloned_vtables_offset); }
268   char* serialized_data()                  const { return from_mapped_offset(_serialized_data_offset); }
269   address i2i_entry_code_buffers()         const { return (address)from_mapped_offset(_i2i_entry_code_buffers_offset); }
270   size_t i2i_entry_code_buffers_size()     const { return _i2i_entry_code_buffers_size; }
271   address heap_end()                       const { return _heap_end; }
272   bool base_archive_is_default()           const { return _base_archive_is_default; }
273   const char* jvm_ident()                  const { return _jvm_ident; }
274   size_t base_archive_name_size()          const { return _base_archive_name_size; }
275   char* requested_base_address()           const { return _requested_base_address; }
276   char* mapped_base_address()              const { return _mapped_base_address; }
277   bool has_platform_or_app_classes()       const { return _has_platform_or_app_classes; }
278   size_t ptrmap_size_in_bits()             const { return _ptrmap_size_in_bits; }
279   bool compressed_oops()                   const { return _compressed_oops; }
280   bool compressed_class_pointers()         const { return _compressed_class_ptrs; }
281   // FIXME: These should really return int
282   jshort max_used_path_index()             const { return _max_used_path_index; }
283   jshort app_module_paths_start_index()    const { return _app_module_paths_start_index; }
284   jshort app_class_paths_start_index()     const { return _app_class_paths_start_index; }
285   jshort num_module_paths()                const { return _num_module_paths; }
286 
287   void set_has_platform_or_app_classes(bool v)   { _has_platform_or_app_classes = v; }
288   void set_cloned_vtables(char* p)               { set_mapped_offset(p, &_cloned_vtables_offset); }
289   void set_serialized_data(char* p)              { set_mapped_offset(p, &_serialized_data_offset); }
290   void set_base_archive_name_size(size_t s)      { _base_archive_name_size = s; }
291   void set_base_archive_is_default(bool b)       { _base_archive_is_default = b; }
292   void set_header_size(size_t s)                 { _header_size = s; }
293   void set_ptrmap_size_in_bits(size_t s)         { _ptrmap_size_in_bits = s; }
294   void set_mapped_base_address(char* p)          { _mapped_base_address = p; }
295   void set_i2i_entry_code_buffers(address p, size_t s) {
296     set_mapped_offset((char*)p, &_i2i_entry_code_buffers_offset);
297     _i2i_entry_code_buffers_size = s;
298   }
299 
300   void set_shared_path_table(SharedPathTable table) {
301     set_mapped_offset((char*)table.table(), &_shared_path_table_offset);
302     _shared_path_table_size = table.size();
303   }
304 
305   void set_final_requested_base(char* b) {
306     _requested_base_address = b;
307     _mapped_base_address = 0;
308   }
309 
310   SharedPathTable shared_path_table() const {
311     return SharedPathTable((Array<u8>*)from_mapped_offset(_shared_path_table_offset),
312                            _shared_path_table_size);
313   }
314 
315   bool validate();
316   int compute_crc();
317 
318   FileMapRegion* space_at(int i) {
319     assert(is_valid_region(i), "invalid region");
320     return FileMapRegion::cast(&_space[i]);
321   }
322 
323   void populate(FileMapInfo* info, size_t alignment);
324 
325   static bool is_valid_region(int region) {
326     return (0 <= region && region < NUM_CDS_REGIONS);
327   }
328 };
329 
330 class FileMapInfo : public CHeapObj<mtInternal> {
331 private:
332   friend class ManifestStream;
333   friend class VMStructs;
334   friend class CDSOffsets;
335   friend class FileMapHeader;
336 
337   bool           _is_static;
338   bool           _file_open;
339   bool           _is_mapped;
340   int            _fd;
341   size_t         _file_offset;
342   const char*    _full_path;
343   const char*    _base_archive_name;
344   FileMapHeader* _header;
345 
346   // TODO: Probably change the following to be non-static
347   static SharedPathTable       _shared_path_table;
348   static SharedPathTable       _saved_shared_path_table;
349   static bool                  _validating_shared_path_table;
350 
351   // FileMapHeader describes the shared space data in the file to be
352   // mapped.  This structure gets written to a file.  It is not a class, so
353   // that the compilers don't add any compiler-private data to it.
354 
355   static FileMapInfo* _current_info;
356   static FileMapInfo* _dynamic_archive_info;
357   static bool _heap_pointers_need_patching;
358   static bool _memory_mapping_failed;
359   static GrowableArray<const char*>* _non_existent_class_paths;
360 
361   FileMapHeader *header() const       { return _header; }
362 
363 public:
364   static bool get_base_archive_name_from_header(const char* archive_name,
365                                                 int* size, char** base_archive_name);
366   static bool check_archive(const char* archive_name, bool is_static);
367   static SharedPathTable shared_path_table() {
368     return _shared_path_table;
369   }
370   static SharedPathTable saved_shared_path_table() {
371     return _saved_shared_path_table;
372   }
373 
374   bool init_from_file(int fd);
375   static void metaspace_pointers_do(MetaspaceClosure* it, bool use_copy = true);
376 
377   void log_paths(const char* msg, int start_idx, int end_idx);
378 
379   FileMapInfo(bool is_static);
380   ~FileMapInfo();
381 
382   // Accessors
383   int    compute_header_crc()  const { return header()->compute_crc(); }
384   void   set_header_crc(int crc)     { header()->set_crc(crc); }
385   int    space_crc(int i)      const { return space_at(i)->crc(); }
386   void   populate_header(size_t alignment);
387   bool   validate_header();
388   void   invalidate();
389   int    crc()                 const { return header()->crc(); }
390   int    version()             const { return header()->version(); }
391   size_t alignment()           const { return header()->alignment(); }
392   address narrow_oop_base()    const { return header()->narrow_oop_base(); }
393   int     narrow_oop_shift()   const { return header()->narrow_oop_shift(); }
394   uintx   max_heap_size()      const { return header()->max_heap_size(); }
395   address narrow_klass_base()  const { return header()->narrow_klass_base(); }
396   int     narrow_klass_shift() const { return header()->narrow_klass_shift(); }
397 
398   CompressedOops::Mode narrow_oop_mode()      const { return header()->narrow_oop_mode(); }
399   jshort app_module_paths_start_index()       const { return header()->app_module_paths_start_index(); }
400   jshort app_class_paths_start_index()        const { return header()->app_class_paths_start_index(); }
401 
402   char* cloned_vtables()                      const { return header()->cloned_vtables(); }
403   void  set_cloned_vtables(char* p)           const { header()->set_cloned_vtables(p); }
404   char* serialized_data()                     const { return header()->serialized_data(); }
405   void  set_serialized_data(char* p)          const { header()->set_serialized_data(p); }
406 
407   bool  is_file_position_aligned() const;
408   void  align_file_position();
409 
410   address i2i_entry_code_buffers()            const { return header()->i2i_entry_code_buffers();  }
411   size_t i2i_entry_code_buffers_size()        const { return header()->i2i_entry_code_buffers_size(); }
412   void set_i2i_entry_code_buffers(address addr, size_t s) const {
413     header()->set_i2i_entry_code_buffers(addr, s);
414   }
415 
416   bool is_static()                            const { return _is_static; }
417   bool is_mapped()                            const { return _is_mapped; }
418   void set_is_mapped(bool v)                        { _is_mapped = v; }
419   const char* full_path()                     const { return _full_path; }
420   void set_final_requested_base(char* b);
421 
422   char* requested_base_address()           const { return header()->requested_base_address(); }
423 
424 
425   class DynamicArchiveHeader* dynamic_header() const {
426     assert(!is_static(), "must be");
427     return (DynamicArchiveHeader*)header();
428   }
429 
430   void set_has_platform_or_app_classes(bool v) {
431     header()->set_has_platform_or_app_classes(v);
432   }
433   bool has_platform_or_app_classes() const {
434     return header()->has_platform_or_app_classes();
435   }
436 
437   static FileMapInfo* current_info() {
438     CDS_ONLY(return _current_info;)
439     NOT_CDS(return NULL;)
440   }
441 
442   static void set_current_info(FileMapInfo* info) {
443     CDS_ONLY(_current_info = info;)
444   }
445 
446   static FileMapInfo* dynamic_info() {
447     CDS_ONLY(return _dynamic_archive_info;)
448     NOT_CDS(return NULL;)
449   }
450 
451   static void assert_mark(bool check);
452 
453   // File manipulation.
454   bool  initialize() NOT_CDS_RETURN_(false);
455   bool  open_for_read();
456   void  open_for_write(const char* path = NULL);
457   void  write_header();
458   void  write_region(int region, char* base, size_t size,
459                      bool read_only, bool allow_exec);
460   void  write_bitmap_region(const CHeapBitMap* ptrmap,
461                             GrowableArray<ArchiveHeapOopmapInfo>* closed_oopmaps,
462                             GrowableArray<ArchiveHeapOopmapInfo>* open_oopmaps);
463   size_t write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem,
464                                     GrowableArray<ArchiveHeapOopmapInfo> *oopmaps,
465                                     int first_region_id, int max_num_regions);
466   void  write_bytes(const void* buffer, size_t count);
467   void  write_bytes_aligned(const void* buffer, size_t count);
468   size_t  read_bytes(void* buffer, size_t count);
469   MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
470   void  unmap_regions(int regions[], int num_regions);
471   void  map_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
472   void  fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
473   void  patch_archived_heap_embedded_pointers() NOT_CDS_JAVA_HEAP_RETURN;
474   void  patch_archived_heap_embedded_pointers(MemRegion* ranges, int num_ranges,
475                                               int first_region_idx) NOT_CDS_JAVA_HEAP_RETURN;
476   bool  has_heap_regions()  NOT_CDS_JAVA_HEAP_RETURN_(false);
477   MemRegion get_heap_regions_range_with_current_oop_encoding_mode() NOT_CDS_JAVA_HEAP_RETURN_(MemRegion());
478   void  unmap_region(int i);
479   bool  verify_region_checksum(int i);
480   void  close();
481   bool  is_open() { return _file_open; }
482   ReservedSpace reserve_shared_memory();
483 
484   // JVM/TI RedefineClasses() support:
485   // Remap the shared readonly space to shared readwrite, private.
486   bool  remap_shared_readonly_as_readwrite();
487 
488   // Errors.
489   static void fail_stop(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2);
490   static void fail_continue(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2);
491   static bool memory_mapping_failed() {
492     CDS_ONLY(return _memory_mapping_failed;)
493     NOT_CDS(return false;)
494   }
495   bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
496 
497   // Stop CDS sharing and unmap CDS regions.
498   static void stop_sharing_and_unmap(const char* msg);
499 
500   static void allocate_shared_path_table();
501   static void copy_shared_path_table(ClassLoaderData* loader_data, Thread* THREAD);
502   static int add_shared_classpaths(int i, const char* which, ClassPathEntry *cpe, TRAPS);
503   static void check_nonempty_dir_in_shared_path_table();
504   bool validate_shared_path_table();
505   void validate_non_existent_class_paths();
506   static void set_shared_path_table(FileMapInfo* info) {
507     _shared_path_table = info->header()->shared_path_table();
508   }
509   static void update_jar_manifest(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS);
510   static int num_non_existent_class_paths();
511   static void record_non_existent_class_path_entry(const char* path);
512 
513 #if INCLUDE_JVMTI
514   static ClassFileStream* open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS);
515 #endif
516 
517   static SharedClassPathEntry* shared_path(int index) {
518     return _shared_path_table.path_at(index);
519   }
520 
521   static const char* shared_path_name(int index) {
522     assert(index >= 0, "Sanity");
523     return shared_path(index)->name();
524   }
525 
526   static int get_number_of_shared_paths() {
527     return _shared_path_table.size();
528   }
529 
530   static int get_module_shared_path_index(Symbol* location) NOT_CDS_RETURN_(-1);
531 
532   char* region_addr(int idx);
533 
534   // The offset of the first core region in the archive, relative to SharedBaseAddress
535   size_t mapping_base_offset() const { return first_core_space()->mapping_offset(); }
536   // The offset of the (exclusive) end of the last core region in this archive, relative to SharedBaseAddress
537   size_t mapping_end_offset()  const { return last_core_space()->mapping_end_offset(); }
538 
539   char* mapped_base()    const { return first_core_space()->mapped_base(); }
540   char* mapped_end()     const { return last_core_space()->mapped_end();   }
541 
542   // Non-zero if the archive needs to be mapped a non-default location due to ASLR.
543   intx relocation_delta() const {
544     return header()->mapped_base_address() - header()->requested_base_address();
545   }
546 
547   FileMapRegion* first_core_space() const;
548   FileMapRegion* last_core_space() const;
549 
550   FileMapRegion* space_at(int i) const {
551     return header()->space_at(i);
552   }
553 
554  private:
555   void  seek_to_position(size_t pos);
556   char* skip_first_path_entry(const char* path) NOT_CDS_RETURN_(NULL);
557   int   num_paths(const char* path) NOT_CDS_RETURN_(0);
558   GrowableArray<const char*>* create_path_array(const char* path) NOT_CDS_RETURN_(NULL);
559   bool  classpath_failure(const char* msg, const char* name) NOT_CDS_RETURN_(false);
560   bool  check_paths(int shared_path_start_idx, int num_paths,
561                     GrowableArray<const char*>* rp_array) NOT_CDS_RETURN_(false);
562   bool  validate_boot_class_paths() NOT_CDS_RETURN_(false);
563   bool  validate_app_class_paths(int shared_app_paths_len) NOT_CDS_RETURN_(false);
564   bool  map_heap_data(MemRegion **heap_mem, int first, int max, int* num,
565                       bool is_open = false) NOT_CDS_JAVA_HEAP_RETURN_(false);
566   bool  region_crc_check(char* buf, size_t size, int expected_crc) NOT_CDS_RETURN_(false);
567   void  dealloc_archive_heap_regions(MemRegion* regions, int num) NOT_CDS_JAVA_HEAP_RETURN;
568   void  map_heap_regions_impl() NOT_CDS_JAVA_HEAP_RETURN;
569   char* map_bitmap_region();
570   MapArchiveResult map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs);
571   bool  read_region(int i, char* base, size_t size);
572   bool  relocate_pointers(intx addr_delta);
573   static size_t set_oopmaps_offset(GrowableArray<ArchiveHeapOopmapInfo> *oopmaps, size_t curr_size);
574   static size_t write_oopmaps(GrowableArray<ArchiveHeapOopmapInfo> *oopmaps, size_t curr_offset, uintptr_t* buffer);
575 
576   // The starting address of spc, as calculated with CompressedOop::decode_non_null()
577   address start_address_as_decoded_with_current_oop_encoding_mode(FileMapRegion* spc) {
578     return decode_start_address(spc, true);
579   }
580 
581   // The starting address of spc, as calculated with HeapShared::decode_from_archive()
582   address start_address_as_decoded_from_archive(FileMapRegion* spc) {
583     return decode_start_address(spc, false);
584   }
585 
586   address decode_start_address(FileMapRegion* spc, bool with_current_oop_encoding_mode);
587 
588 #if INCLUDE_JVMTI
589   static ClassPathEntry** _classpath_entries_for_jvmti;
590   static ClassPathEntry* get_classpath_entry_for_jvmti(int i, TRAPS);
591 #endif
592 };
593 
594 #endif // SHARE_MEMORY_FILEMAP_HPP