1 /*
2 * Copyright (c) 2003, 2024, 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_CDS_FILEMAP_HPP
26 #define SHARE_CDS_FILEMAP_HPP
27
28 #include "cds/metaspaceShared.hpp"
29 #include "include/cds.h"
30 #include "logging/logLevel.hpp"
31 #include "memory/allocation.hpp"
32 #include "oops/array.hpp"
33 #include "oops/compressedOops.hpp"
34 #include "utilities/align.hpp"
35
36 // To understand the layout of the CDS archive file:
37 //
38 // java -Xlog:cds+map=info:file=cds.map:none:filesize=0
39 // java -Xlog:cds+map=debug:file=cds.map:none:filesize=0
40 // java -Xlog:cds+map=trace:file=cds.map:none:filesize=0
41
42 static const int JVM_IDENT_MAX = 256;
43
44 class ArchiveHeapInfo;
45 class BitMapView;
46 class CHeapBitMap;
47 class ClassFileStream;
48 class ClassLoaderData;
49 class ClassPathEntry;
50 class outputStream;
51
52 class SharedClassPathEntry : public MetaspaceObj {
53 enum {
54 modules_image_entry,
55 jar_entry,
56 dir_entry,
57 non_existent_entry,
58 unknown_entry
59 };
60
61 void set_name(const char* name, TRAPS);
62
63 u1 _type;
64 bool _is_module_path;
65 bool _from_class_path_attr;
66 time_t _timestamp; // jar timestamp, 0 if is directory, modules image or other
67 int64_t _filesize; // jar/jimage file size, -1 if is directory, -2 if other
68 Array<char>* _name;
69 Array<u1>* _manifest;
70
71 public:
72 SharedClassPathEntry() : _type(0), _is_module_path(false),
73 _from_class_path_attr(false), _timestamp(0),
74 _filesize(0), _name(nullptr), _manifest(nullptr) {}
75 static int size() {
76 static_assert(is_aligned(sizeof(SharedClassPathEntry), wordSize), "must be");
77 return (int)(sizeof(SharedClassPathEntry) / wordSize);
78 }
79 void init(bool is_modules_image, bool is_module_path, ClassPathEntry* cpe, TRAPS);
80 void init_as_non_existent(const char* path, TRAPS);
81 void metaspace_pointers_do(MetaspaceClosure* it);
82 MetaspaceObj::Type type() const { return SharedClassPathEntryType; }
83 bool validate(bool is_class_path = true) const;
84
85 // The _timestamp only gets set for jar files.
86 bool has_timestamp() const {
87 return _timestamp != 0;
88 }
89 bool is_dir() const { return _type == dir_entry; }
90 bool is_modules_image() const { return _type == modules_image_entry; }
91 bool is_jar() const { return _type == jar_entry; }
92 bool is_non_existent() const { return _type == non_existent_entry; }
93 bool from_class_path_attr() { return _from_class_path_attr; }
94 time_t timestamp() const { return _timestamp; }
95 const char* name() const;
96 const char* manifest() const {
97 return (_manifest == nullptr) ? nullptr : (const char*)_manifest->data();
98 }
99 int manifest_size() const {
100 return (_manifest == nullptr) ? 0 : _manifest->length();
101 }
102 void set_manifest(Array<u1>* manifest) {
103 _manifest = manifest;
104 }
105 bool check_non_existent() const;
106 void copy_from(SharedClassPathEntry* ent, ClassLoaderData* loader_data, TRAPS);
107 bool in_named_module() {
108 return is_modules_image() || // modules image doesn't contain unnamed modules
109 _is_module_path; // module path doesn't contain unnamed modules
110 }
111 };
112
113 class SharedPathTable {
114 Array<SharedClassPathEntry*>* _entries;
115 public:
116 SharedPathTable() : _entries(nullptr) {}
117 SharedPathTable(Array<SharedClassPathEntry*>* entries) : _entries(entries) {}
118
119 void dumptime_init(ClassLoaderData* loader_data, TRAPS);
120 void metaspace_pointers_do(MetaspaceClosure* it);
121
122 int size() {
123 return _entries == nullptr ? 0 : _entries->length();
124 }
125 SharedClassPathEntry* path_at(int index) {
126 return _entries->at(index);
127 }
128 Array<SharedClassPathEntry*>* table() {return _entries;}
129 void set_table(Array<SharedClassPathEntry*>* table) {_entries = table;}
130 };
131
132
133 class FileMapRegion: private CDSFileMapRegion {
134 public:
135 void assert_is_heap_region() const {
136 assert(_is_heap_region, "must be heap region");
137 }
138 void assert_is_not_heap_region() const {
139 assert(!_is_heap_region, "must not be heap region");
140 }
141
142 static FileMapRegion* cast(CDSFileMapRegion* p) {
143 return (FileMapRegion*)p;
144 }
145
146 // Accessors
147 int crc() const { return _crc; }
148 size_t file_offset() const { return _file_offset; }
149 size_t mapping_offset() const { return _mapping_offset; }
150 size_t mapping_end_offset() const { return _mapping_offset + used_aligned(); }
151 size_t used() const { return _used; }
152 size_t used_aligned() const; // aligned up to MetaspaceShared::core_region_alignment()
153 char* mapped_base() const { return _mapped_base; }
154 char* mapped_end() const { return mapped_base() + used_aligned(); }
155 bool read_only() const { return _read_only != 0; }
156 bool allow_exec() const { return _allow_exec != 0; }
157 bool mapped_from_file() const { return _mapped_from_file != 0; }
158 size_t oopmap_offset() const { assert_is_heap_region(); return _oopmap_offset; }
159 size_t oopmap_size_in_bits() const { assert_is_heap_region(); return _oopmap_size_in_bits; }
160 size_t ptrmap_offset() const { return _ptrmap_offset; }
161 size_t ptrmap_size_in_bits() const { return _ptrmap_size_in_bits; }
162
163 void set_file_offset(size_t s) { _file_offset = s; }
164 void set_read_only(bool v) { _read_only = v; }
165 void set_mapped_base(char* p) { _mapped_base = p; }
166 void set_mapped_from_file(bool v) { _mapped_from_file = v; }
167 void init(int region_index, size_t mapping_offset, size_t size, bool read_only,
168 bool allow_exec, int crc);
169 void init_oopmap(size_t offset, size_t size_in_bits);
170 void init_ptrmap(size_t offset, size_t size_in_bits);
171 bool has_ptrmap() { return _ptrmap_size_in_bits != 0; }
172
173 bool check_region_crc(char* base) const;
174 void print(outputStream* st, int region_index);
175 };
176
177 class FileMapHeader: private CDSFileMapHeaderBase {
178 friend class CDSConstants;
179 friend class VMStructs;
180
181 private:
182 // The following fields record the states of the VM during dump time.
183 // They are compared with the runtime states to see if the archive
184 // can be used.
185 size_t _core_region_alignment; // how shared archive should be aligned
186 int _obj_alignment; // value of ObjectAlignmentInBytes
187 address _narrow_oop_base; // compressed oop encoding base
188 int _narrow_oop_shift; // compressed oop encoding shift
189 bool _compact_strings; // value of CompactStrings
190 bool _compact_headers; // value of UseCompactObjectHeaders
191 uintx _max_heap_size; // java max heap size during dumping
192 CompressedOops::Mode _narrow_oop_mode; // compressed oop encoding mode
193 bool _compressed_oops; // save the flag UseCompressedOops
194 bool _compressed_class_ptrs; // save the flag UseCompressedClassPointers
195 int _narrow_klass_pointer_bits; // save number of bits in narrowKlass
196 int _narrow_klass_shift; // save shift width used to pre-compute narrowKlass IDs in archived heap objects
197 size_t _cloned_vtables_offset; // The address of the first cloned vtable
198 size_t _serialized_data_offset; // Data accessed using {ReadClosure,WriteClosure}::serialize()
199 bool _has_non_jar_in_classpath; // non-jar file entry exists in classpath
200 unsigned int _common_app_classpath_prefix_size; // size of the common prefix of app class paths
201 // 0 if no common prefix exists
202
203 // The following fields are all sanity checks for whether this archive
204 // will function correctly with this JVM and the bootclasspath it's
205 // invoked with.
206 char _jvm_ident[JVM_IDENT_MAX]; // identifier string of the jvm that created this dump
207
208 // The following is a table of all the boot/app/module path entries that were used
209 // during dumping. At run time, we validate these entries according to their
210 // SharedClassPathEntry::_type. See:
211 // check_nonempty_dir_in_shared_path_table()
212 // validate_shared_path_table()
213 // validate_non_existent_class_paths()
214 size_t _shared_path_table_offset;
215
216 jshort _app_class_paths_start_index; // Index of first app classpath entry
217 jshort _app_module_paths_start_index; // Index of first module path entry
218 jshort _max_used_path_index; // max path index referenced during CDS dump
219 int _num_module_paths; // number of module path entries
220 bool _verify_local; // BytecodeVerificationLocal setting
221 bool _verify_remote; // BytecodeVerificationRemote setting
222 bool _has_platform_or_app_classes; // Archive contains app classes
223 char* _requested_base_address; // Archive relocation is not necessary if we map with this base address.
224 char* _mapped_base_address; // Actual base address where archive is mapped.
225
226 bool _allow_archiving_with_java_agent; // setting of the AllowArchivingWithJavaAgent option
227 bool _use_optimized_module_handling;// No module-relation VM options were specified, so we can skip
228 // some expensive operations.
229 bool _has_full_module_graph; // Does this CDS archive contain the full archived module graph?
230 size_t _heap_roots_offset; // Offset of the HeapShared::roots() object, from the bottom
231 // of the archived heap objects, in bytes.
232 size_t _heap_oopmap_start_pos; // The first bit in the oopmap corresponds to this position in the heap.
233 size_t _heap_ptrmap_start_pos; // The first bit in the ptrmap corresponds to this position in the heap.
234 char* from_mapped_offset(size_t offset) const {
235 return mapped_base_address() + offset;
236 }
237 void set_as_offset(char* p, size_t *offset);
238 public:
239 // Accessors -- fields declared in GenericCDSFileMapHeader
240 unsigned int magic() const { return _generic_header._magic; }
241 int crc() const { return _generic_header._crc; }
242 int version() const { return _generic_header._version; }
243 unsigned int header_size() const { return _generic_header._header_size; }
244 unsigned int base_archive_name_offset() const { return _generic_header._base_archive_name_offset; }
245 unsigned int base_archive_name_size() const { return _generic_header._base_archive_name_size; }
246 unsigned int common_app_classpath_prefix_size() const { return _common_app_classpath_prefix_size; }
247
248 void set_magic(unsigned int m) { _generic_header._magic = m; }
249 void set_crc(int crc_value) { _generic_header._crc = crc_value; }
250 void set_version(int v) { _generic_header._version = v; }
251 void set_header_size(unsigned int s) { _generic_header._header_size = s; }
252 void set_base_archive_name_offset(unsigned int s) { _generic_header._base_archive_name_offset = s; }
253 void set_base_archive_name_size(unsigned int s) { _generic_header._base_archive_name_size = s; }
254 void set_common_app_classpath_prefix_size(unsigned int s) { _common_app_classpath_prefix_size = s; }
255
256 bool is_static() const { return magic() == CDS_ARCHIVE_MAGIC; }
257 size_t core_region_alignment() const { return _core_region_alignment; }
258 int obj_alignment() const { return _obj_alignment; }
259 address narrow_oop_base() const { return _narrow_oop_base; }
260 int narrow_oop_shift() const { return _narrow_oop_shift; }
261 bool compact_strings() const { return _compact_strings; }
262 bool compact_headers() const { return _compact_headers; }
263 uintx max_heap_size() const { return _max_heap_size; }
264 CompressedOops::Mode narrow_oop_mode() const { return _narrow_oop_mode; }
265 char* cloned_vtables() const { return from_mapped_offset(_cloned_vtables_offset); }
266 char* serialized_data() const { return from_mapped_offset(_serialized_data_offset); }
267 const char* jvm_ident() const { return _jvm_ident; }
268 char* requested_base_address() const { return _requested_base_address; }
269 char* mapped_base_address() const { return _mapped_base_address; }
270 bool has_platform_or_app_classes() const { return _has_platform_or_app_classes; }
271 bool has_non_jar_in_classpath() const { return _has_non_jar_in_classpath; }
272 bool compressed_oops() const { return _compressed_oops; }
273 bool compressed_class_pointers() const { return _compressed_class_ptrs; }
274 int narrow_klass_pointer_bits() const { return _narrow_klass_pointer_bits; }
275 int narrow_klass_shift() const { return _narrow_klass_shift; }
276 size_t heap_roots_offset() const { return _heap_roots_offset; }
277 size_t heap_oopmap_start_pos() const { return _heap_oopmap_start_pos;}
278 size_t heap_ptrmap_start_pos() const { return _heap_ptrmap_start_pos;}
279 // FIXME: These should really return int
280 jshort max_used_path_index() const { return _max_used_path_index; }
281 jshort app_module_paths_start_index() const { return _app_module_paths_start_index; }
282 jshort app_class_paths_start_index() const { return _app_class_paths_start_index; }
283 int num_module_paths() const { return _num_module_paths; }
284
285 void set_has_platform_or_app_classes(bool v) { _has_platform_or_app_classes = v; }
286 void set_cloned_vtables(char* p) { set_as_offset(p, &_cloned_vtables_offset); }
287 void set_serialized_data(char* p) { set_as_offset(p, &_serialized_data_offset); }
288 void set_mapped_base_address(char* p) { _mapped_base_address = p; }
289 void set_heap_roots_offset(size_t n) { _heap_roots_offset = n; }
290 void set_heap_oopmap_start_pos(size_t n) { _heap_oopmap_start_pos = n; }
291 void set_heap_ptrmap_start_pos(size_t n) { _heap_ptrmap_start_pos = n; }
292 void copy_base_archive_name(const char* name);
293
294 void set_shared_path_table(SharedPathTable table) {
295 set_as_offset((char*)table.table(), &_shared_path_table_offset);
296 }
297
298 void set_requested_base(char* b) {
299 _requested_base_address = b;
300 _mapped_base_address = 0;
301 }
302
303 SharedPathTable shared_path_table() const {
304 return SharedPathTable((Array<SharedClassPathEntry*>*)
305 from_mapped_offset(_shared_path_table_offset));
306 }
307
308 bool validate();
309 int compute_crc();
310
311 FileMapRegion* region_at(int i) {
312 assert(is_valid_region(i), "invalid region");
313 return FileMapRegion::cast(&_regions[i]);
314 }
315
316 void populate(FileMapInfo *info, size_t core_region_alignment, size_t header_size,
317 size_t base_archive_name_size, size_t base_archive_name_offset,
318 size_t common_app_classpath_size);
319 static bool is_valid_region(int region) {
320 return (0 <= region && region < NUM_CDS_REGIONS);
321 }
322
323 void print(outputStream* st);
324 };
325
326 class FileMapInfo : public CHeapObj<mtInternal> {
327 private:
328 friend class ManifestStream;
329 friend class VMStructs;
330 friend class ArchiveBuilder;
331 friend class CDSOffsets;
332 friend class FileMapHeader;
333
334 bool _is_static;
335 bool _file_open;
336 bool _is_mapped;
337 int _fd;
338 size_t _file_offset;
339 const char* _full_path;
340 const char* _base_archive_name;
341 FileMapHeader* _header;
342
343 static SharedPathTable _shared_path_table;
344 static bool _validating_shared_path_table;
345
346 // FileMapHeader describes the shared space data in the file to be
347 // mapped. This structure gets written to a file. It is not a class, so
348 // that the compilers don't add any compiler-private data to it.
349
350 static FileMapInfo* _current_info;
351 static FileMapInfo* _dynamic_archive_info;
352 static bool _heap_pointers_need_patching;
353 static bool _memory_mapping_failed;
354 static GrowableArray<const char*>* _non_existent_class_paths;
355
356 public:
357 FileMapHeader *header() const { return _header; }
358 static bool get_base_archive_name_from_header(const char* archive_name,
359 char** base_archive_name);
360 static SharedPathTable shared_path_table() {
361 return _shared_path_table;
362 }
363
364 bool init_from_file(int fd);
365 static void metaspace_pointers_do(MetaspaceClosure* it) {
366 _shared_path_table.metaspace_pointers_do(it);
367 }
368
369 void log_paths(const char* msg, int start_idx, int end_idx);
370
371 FileMapInfo(const char* full_apth, bool is_static);
372 ~FileMapInfo();
373
374 // Accessors
375 int compute_header_crc() const { return header()->compute_crc(); }
376 void set_header_crc(int crc) { header()->set_crc(crc); }
377 int region_crc(int i) const { return region_at(i)->crc(); }
378 void populate_header(size_t core_region_alignment);
379 bool validate_header();
380 void invalidate();
381 int crc() const { return header()->crc(); }
382 int version() const { return header()->version(); }
383 unsigned int magic() const { return header()->magic(); }
384 address narrow_oop_base() const { return header()->narrow_oop_base(); }
385 int narrow_oop_shift() const { return header()->narrow_oop_shift(); }
386 uintx max_heap_size() const { return header()->max_heap_size(); }
387 size_t heap_roots_offset() const { return header()->heap_roots_offset(); }
388 size_t core_region_alignment() const { return header()->core_region_alignment(); }
389 size_t heap_oopmap_start_pos() const { return header()->heap_oopmap_start_pos(); }
390 size_t heap_ptrmap_start_pos() const { return header()->heap_ptrmap_start_pos(); }
391
392 CompressedOops::Mode narrow_oop_mode() const { return header()->narrow_oop_mode(); }
393 jshort app_module_paths_start_index() const { return header()->app_module_paths_start_index(); }
394 jshort app_class_paths_start_index() const { return header()->app_class_paths_start_index(); }
395
396 char* cloned_vtables() const { return header()->cloned_vtables(); }
397 void set_cloned_vtables(char* p) const { header()->set_cloned_vtables(p); }
398 char* serialized_data() const { return header()->serialized_data(); }
399 void set_serialized_data(char* p) const { header()->set_serialized_data(p); }
400
401 bool is_file_position_aligned() const;
402 void align_file_position();
403
404 bool is_static() const { return _is_static; }
405 bool is_mapped() const { return _is_mapped; }
406 void set_is_mapped(bool v) { _is_mapped = v; }
407 const char* full_path() const { return _full_path; }
408
409 void set_requested_base(char* b) { header()->set_requested_base(b); }
410 char* requested_base_address() const { return header()->requested_base_address(); }
411
412 class DynamicArchiveHeader* dynamic_header() const {
413 assert(!is_static(), "must be");
414 return (DynamicArchiveHeader*)header();
415 }
416
417 void set_has_platform_or_app_classes(bool v) {
418 header()->set_has_platform_or_app_classes(v);
419 }
420 bool has_platform_or_app_classes() const {
421 return header()->has_platform_or_app_classes();
422 }
423
424 static FileMapInfo* current_info() {
425 CDS_ONLY(return _current_info;)
426 NOT_CDS(return nullptr;)
427 }
428
429 static void set_current_info(FileMapInfo* info) {
430 CDS_ONLY(_current_info = info;)
431 }
432
433 static FileMapInfo* dynamic_info() {
434 CDS_ONLY(return _dynamic_archive_info;)
435 NOT_CDS(return nullptr;)
436 }
437
438 static void assert_mark(bool check);
439
440 // File manipulation.
441 bool initialize() NOT_CDS_RETURN_(false);
442 bool open_for_read();
443 void open_for_write();
444 void write_header();
445 void write_region(int region, char* base, size_t size,
446 bool read_only, bool allow_exec);
447 size_t remove_bitmap_leading_zeros(CHeapBitMap* map);
448 char* write_bitmap_region(const CHeapBitMap* rw_ptrmap, const CHeapBitMap* ro_ptrmap, ArchiveHeapInfo* heap_info,
449 size_t &size_in_bytes);
450 size_t write_heap_region(ArchiveHeapInfo* heap_info);
451 void write_bytes(const void* buffer, size_t count);
452 void write_bytes_aligned(const void* buffer, size_t count);
453 size_t read_bytes(void* buffer, size_t count);
454 static size_t readonly_total();
455 MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
456 void unmap_regions(int regions[], int num_regions);
457 void map_or_load_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
458 void fixup_mapped_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
459 void patch_heap_embedded_pointers() NOT_CDS_JAVA_HEAP_RETURN;
460 bool has_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
461 MemRegion get_heap_region_requested_range() NOT_CDS_JAVA_HEAP_RETURN_(MemRegion());
462 bool read_region(int i, char* base, size_t size, bool do_commit);
463 char* map_bitmap_region();
464 void unmap_region(int i);
465 void close();
466 bool is_open() { return _file_open; }
467 ReservedSpace reserve_shared_memory();
468
469 // JVM/TI RedefineClasses() support:
470 // Remap the shared readonly space to shared readwrite, private.
471 bool remap_shared_readonly_as_readwrite();
472
473 static bool memory_mapping_failed() {
474 CDS_ONLY(return _memory_mapping_failed;)
475 NOT_CDS(return false;)
476 }
477
478 static void allocate_shared_path_table(TRAPS);
479 static int add_shared_classpaths(int i, const char* which, ClassPathEntry *cpe, TRAPS);
480 static void check_nonempty_dir_in_shared_path_table();
481 bool check_module_paths();
482 bool validate_shared_path_table();
483 void validate_non_existent_class_paths();
484 static void set_shared_path_table(FileMapInfo* info) {
485 _shared_path_table = info->header()->shared_path_table();
486 }
487 static void update_jar_manifest(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS);
488 static int num_non_existent_class_paths();
489 static void record_non_existent_class_path_entry(const char* path);
490
491 #if INCLUDE_JVMTI
492 // Caller needs a ResourceMark because parts of the returned cfs are resource-allocated.
493 static ClassFileStream* open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS);
494 #endif
495
496 static SharedClassPathEntry* shared_path(int index) {
497 return _shared_path_table.path_at(index);
498 }
499
500 static const char* shared_path_name(int index) {
501 assert(index >= 0, "Sanity");
502 return shared_path(index)->name();
503 }
504
505 static int get_number_of_shared_paths() {
506 return _shared_path_table.size();
507 }
508
509 static int get_module_shared_path_index(Symbol* location) NOT_CDS_RETURN_(-1);
510
511 // The offset of the first core region in the archive, relative to SharedBaseAddress
512 size_t mapping_base_offset() const { return first_core_region()->mapping_offset(); }
513 // The offset of the (exclusive) end of the last core region in this archive, relative to SharedBaseAddress
514 size_t mapping_end_offset() const { return last_core_region()->mapping_end_offset(); }
515
516 char* mapped_base() const { return first_core_region()->mapped_base(); }
517 char* mapped_end() const { return last_core_region()->mapped_end(); }
518
519 // Non-zero if the archive needs to be mapped a non-default location due to ASLR.
520 intx relocation_delta() const {
521 return header()->mapped_base_address() - header()->requested_base_address();
522 }
523
524 FileMapRegion* first_core_region() const;
525 FileMapRegion* last_core_region() const;
526
527 FileMapRegion* region_at(int i) const {
528 return header()->region_at(i);
529 }
530
531 BitMapView bitmap_view(int region_index, bool is_oopmap);
532 BitMapView oopmap_view(int region_index);
533 BitMapView ptrmap_view(int region_index);
534
535 void print(outputStream* st) const;
536
537 const char* vm_version() {
538 return header()->jvm_ident();
539 }
540
541 private:
542 void seek_to_position(size_t pos);
543 char* skip_first_path_entry(const char* path) NOT_CDS_RETURN_(nullptr);
544 int num_paths(const char* path) NOT_CDS_RETURN_(0);
545 bool check_paths_existence(const char* paths) NOT_CDS_RETURN_(false);
546 GrowableArray<const char*>* create_dumptime_app_classpath_array() NOT_CDS_RETURN_(nullptr);
547 GrowableArray<const char*>* create_path_array(const char* path) NOT_CDS_RETURN_(nullptr);
548 bool classpath_failure(const char* msg, const char* name) NOT_CDS_RETURN_(false);
549 unsigned int longest_common_app_classpath_prefix_len(int num_paths,
550 GrowableArray<const char*>* rp_array)
551 NOT_CDS_RETURN_(0);
552 bool check_paths(int shared_path_start_idx, int num_paths,
553 GrowableArray<const char*>* rp_array,
554 unsigned int dumptime_prefix_len,
555 unsigned int runtime_prefix_len) NOT_CDS_RETURN_(false);
556 bool validate_boot_class_paths() NOT_CDS_RETURN_(false);
557 bool validate_app_class_paths(int shared_app_paths_len) NOT_CDS_RETURN_(false);
558 bool map_heap_region_impl() NOT_CDS_JAVA_HEAP_RETURN_(false);
559 void dealloc_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
560 bool can_use_heap_region();
561 bool load_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
562 bool map_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
563 void init_heap_region_relocation();
564 MapArchiveResult map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs);
565 bool relocate_pointers_in_core_regions(intx addr_delta);
566
567 static MemRegion _mapped_heap_memregion;
568
569 public:
570 address heap_region_dumptime_address() NOT_CDS_JAVA_HEAP_RETURN_(nullptr);
571 address heap_region_requested_address() NOT_CDS_JAVA_HEAP_RETURN_(nullptr);
572 narrowOop encoded_heap_region_dumptime_address();
573
574 private:
575
576 #if INCLUDE_JVMTI
577 static ClassPathEntry** _classpath_entries_for_jvmti;
578 static ClassPathEntry* get_classpath_entry_for_jvmti(int i, TRAPS);
579 #endif
580 };
581
582 #endif // SHARE_CDS_FILEMAP_HPP