1 /*
2 * Copyright (c) 2003, 2026, 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/aotCompressedPointers.hpp"
29 #include "cds/aotMappedHeap.hpp"
30 #include "cds/aotMetaspace.hpp"
31 #include "cds/aotStreamedHeap.hpp"
32 #include "cds/archiveUtils.hpp"
33 #include "cds/heapShared.hpp"
34 #include "include/cds.h"
35 #include "logging/logLevel.hpp"
36 #include "memory/allocation.hpp"
37 #include "oops/array.hpp"
38 #include "oops/compressedOops.hpp"
39 #include "utilities/align.hpp"
40 #include "utilities/bitMap.hpp"
41
42 // To understand the layout of the CDS archive file:
43 //
44 // java -Xlog:cds+map=info:file=cds.map:none:filesize=0
45 // java -Xlog:cds+map=debug:file=cds.map:none:filesize=0
46 // java -Xlog:cds+map=trace:file=cds.map:none:filesize=0
47
48 static const int JVM_IDENT_MAX = 256;
49
50 class AOTClassLocationConfig;
51 class BitMapView;
52 class CHeapBitMap;
53 class ClassFileStream;
54 class ClassLoaderData;
55 class ClassPathEntry;
56 class outputStream;
57 class ReservedSpace;
58
59 class FileMapRegion: private CDSFileMapRegion {
60 public:
61 void assert_is_heap_region() const {
62 assert(_is_heap_region, "must be heap region");
63 }
64 void assert_is_not_heap_region() const {
65 assert(!_is_heap_region, "must not be heap region");
66 }
67
68 static FileMapRegion* cast(CDSFileMapRegion* p) {
69 return (FileMapRegion*)p;
70 }
71
72 // Accessors
73 int crc() const { return _crc; }
74 size_t file_offset() const { return _file_offset; }
75 size_t mapping_offset() const { return _mapping_offset; }
76 size_t mapping_end_offset() const { return _mapping_offset + used_aligned(); }
77 size_t used() const { return _used; }
78 size_t used_aligned() const; // aligned up to AOTMetaspace::core_region_alignment()
79 char* mapped_base() const { return _mapped_base; }
80 char* mapped_end() const { return mapped_base() + used_aligned(); }
81 bool read_only() const { return _read_only != 0; }
82 bool allow_exec() const { return _allow_exec != 0; }
83 bool mapped_from_file() const { return _mapped_from_file != 0; }
84 size_t oopmap_offset() const { assert_is_heap_region(); return _oopmap_offset; }
85 size_t oopmap_size_in_bits() const { assert_is_heap_region(); return _oopmap_size_in_bits; }
86 size_t ptrmap_offset() const { return _ptrmap_offset; }
87 size_t ptrmap_size_in_bits() const { return _ptrmap_size_in_bits; }
88 bool in_reserved_space() const { return _in_reserved_space; }
89
90 void set_file_offset(size_t s) { _file_offset = s; }
91 void set_read_only(bool v) { _read_only = v; }
92 void set_mapped_base(char* p) { _mapped_base = p; }
93 void set_mapped_from_file(bool v) { _mapped_from_file = v; }
94 void set_in_reserved_space(bool is_reserved) { _in_reserved_space = is_reserved; }
95 void init(int region_index, size_t mapping_offset, size_t size, bool read_only,
96 bool allow_exec, int crc);
97 void init_oopmap(size_t offset, size_t size_in_bits);
98 void init_ptrmap(size_t offset, size_t size_in_bits);
99 bool has_ptrmap() { return _ptrmap_size_in_bits != 0; }
100
101 bool check_region_crc(char* base) const;
102 void print(outputStream* st, int region_index);
103 };
104
105 class FileMapHeader: private CDSFileMapHeaderBase {
106 friend class CDSConstants;
107 friend class VMStructs;
108 using narrowPtr = AOTCompressedPointers::narrowPtr;
109 private:
110 // The following fields record the states of the VM during dump time.
111 // They are compared with the runtime states to see if the archive
112 // can be used.
113 size_t _core_region_alignment; // how shared archive should be aligned
114 int _obj_alignment; // value of ObjectAlignmentInBytes
115 address _narrow_oop_base; // compressed oop encoding base
116 int _narrow_oop_shift; // compressed oop encoding shift
117 bool _compact_strings; // value of CompactStrings
118 bool _compact_headers; // value of UseCompactObjectHeaders
119 uintx _max_heap_size; // java max heap size during dumping
120 CompressedOops::Mode _narrow_oop_mode; // compressed oop encoding mode
121 bool _object_streaming_mode; // dump was created for object streaming
122 bool _compressed_oops; // save the flag UseCompressedOops
123 int _narrow_klass_pointer_bits; // save number of bits in narrowKlass
124 int _narrow_klass_shift; // save shift width used to pre-compute narrowKlass IDs in archived heap objects
125 narrowPtr _cloned_vtables; // The address of the first cloned vtable
126 narrowPtr _early_serialized_data; // Data accessed using {ReadClosure,WriteClosure}::serialize()
127 narrowPtr _serialized_data; // Data accessed using {ReadClosure,WriteClosure}::serialize()
128
129 // The following fields are all sanity checks for whether this archive
130 // will function correctly with this JVM and the bootclasspath it's
131 // invoked with.
132 char _jvm_ident[JVM_IDENT_MAX]; // identifier string of the jvm that created this dump
133
134 narrowPtr _class_location_config;
135
136 bool _verify_local; // BytecodeVerificationLocal setting
137 bool _verify_remote; // BytecodeVerificationRemote setting
138 bool _has_platform_or_app_classes; // Archive contains app or platform classes
139 char* _requested_base_address; // Archive relocation is not necessary if we map with this base address.
140 char* _mapped_base_address; // Actual base address where archive is mapped.
141
142 bool _use_optimized_module_handling;// No module-relation VM options were specified, so we can skip
143 // some expensive operations.
144 bool _has_aot_linked_classes; // Was the CDS archive created with -XX:+AOTClassLinking
145 bool _has_full_module_graph; // Does this CDS archive contain the full archived module graph?
146 size_t _rw_ptrmap_start_pos; // The first bit in the ptrmap corresponds to this position in the rw region
147 size_t _ro_ptrmap_start_pos; // The first bit in the ptrmap corresponds to this position in the ro region
148
149 AOTMappedHeapHeader _mapped_heap_header;
150 AOTStreamedHeapHeader _streamed_heap_header;
151
152 // The following are parameters that affect MethodData layout.
153 u1 _compiler_type;
154 uint _type_profile_level;
155 int _type_profile_args_limit;
156 int _type_profile_parms_limit;
157 intx _type_profile_width;
158 intx _bci_profile_width;
159 bool _profile_traps;
160 bool _type_profile_casts;
161 int _spec_trap_limit_extra_entries;
162
163 template <typename T> T decode(narrowPtr narrowp) const {
164 return AOTCompressedPointers::decode_not_null<T>(narrowp, reinterpret_cast<address>(mapped_base_address()));
165 }
166
167 public:
168 // Accessors -- fields declared in GenericCDSFileMapHeader
169 unsigned int magic() const { return _generic_header._magic; }
170 int crc() const { return _generic_header._crc; }
171 int version() const { return _generic_header._version; }
172 unsigned int header_size() const { return _generic_header._header_size; }
173 unsigned int base_archive_name_offset() const { return _generic_header._base_archive_name_offset; }
174 unsigned int base_archive_name_size() const { return _generic_header._base_archive_name_size; }
175
176 void set_magic(unsigned int m) { _generic_header._magic = m; }
177 void set_crc(int crc_value) { _generic_header._crc = crc_value; }
178 void set_version(int v) { _generic_header._version = v; }
179 void set_header_size(unsigned int s) { _generic_header._header_size = s; }
180 void set_base_archive_name_offset(unsigned int s) { _generic_header._base_archive_name_offset = s; }
181 void set_base_archive_name_size(unsigned int s) { _generic_header._base_archive_name_size = s; }
182
183 bool is_static() const { return magic() == CDS_ARCHIVE_MAGIC; }
184 size_t core_region_alignment() const { return _core_region_alignment; }
185 int obj_alignment() const { return _obj_alignment; }
186 address narrow_oop_base() const { return _narrow_oop_base; }
187 int narrow_oop_shift() const { return _narrow_oop_shift; }
188 bool compact_strings() const { return _compact_strings; }
189 bool compact_headers() const { return _compact_headers; }
190 uintx max_heap_size() const { return _max_heap_size; }
191 CompressedOops::Mode narrow_oop_mode() const { return _narrow_oop_mode; }
192 char* cloned_vtables() const { return decode<char*>(_cloned_vtables); }
193 char* early_serialized_data() const { return decode<char*>(_early_serialized_data); }
194 char* serialized_data() const { return decode<char*>(_serialized_data); }
195 bool object_streaming_mode() const { return _object_streaming_mode; }
196 const char* jvm_ident() const { return _jvm_ident; }
197 char* requested_base_address() const { return _requested_base_address; }
198 char* mapped_base_address() const { return _mapped_base_address; }
199 bool has_platform_or_app_classes() const { return _has_platform_or_app_classes; }
200 bool has_aot_linked_classes() const { return _has_aot_linked_classes; }
201 bool compressed_oops() const { return _compressed_oops; }
202 int narrow_klass_pointer_bits() const { return _narrow_klass_pointer_bits; }
203 int narrow_klass_shift() const { return _narrow_klass_shift; }
204 bool has_full_module_graph() const { return _has_full_module_graph; }
205 size_t rw_ptrmap_start_pos() const { return _rw_ptrmap_start_pos; }
206 size_t ro_ptrmap_start_pos() const { return _ro_ptrmap_start_pos; }
207
208 // Heap archiving
209 const AOTMappedHeapHeader* mapped_heap() const { return &_mapped_heap_header; }
210 const AOTStreamedHeapHeader* streamed_heap() const { return &_streamed_heap_header; }
211
212 void set_streamed_heap_header(AOTStreamedHeapHeader header) { _streamed_heap_header = header; }
213 void set_mapped_heap_header(AOTMappedHeapHeader header) { _mapped_heap_header = header; }
214
215 void set_has_platform_or_app_classes(bool v) { _has_platform_or_app_classes = v; }
216 void set_cloned_vtables(char* p) { _cloned_vtables = AOTCompressedPointers::encode_not_null(p); }
217 void set_early_serialized_data(char* p) { _early_serialized_data = AOTCompressedPointers::encode_not_null(p); }
218 void set_serialized_data(char* p) { _serialized_data = AOTCompressedPointers::encode_not_null(p); }
219 void set_mapped_base_address(char* p) { _mapped_base_address = p; }
220 void set_rw_ptrmap_start_pos(size_t n) { _rw_ptrmap_start_pos = n; }
221 void set_ro_ptrmap_start_pos(size_t n) { _ro_ptrmap_start_pos = n; }
222
223 void copy_base_archive_name(const char* name);
224
225 void set_class_location_config(AOTClassLocationConfig* table) {
226 _class_location_config = AOTCompressedPointers::encode_not_null(table);
227 }
228
229 AOTClassLocationConfig* class_location_config() {
230 return decode<AOTClassLocationConfig*>(_class_location_config);
231 }
232
233 void set_requested_base(char* b) {
234 _requested_base_address = b;
235 _mapped_base_address = nullptr;
236 }
237
238 bool validate();
239 int compute_crc();
240
241 FileMapRegion* region_at(int i) {
242 assert(is_valid_region(i), "invalid region");
243 return FileMapRegion::cast(&_regions[i]);
244 }
245
246 void populate(FileMapInfo *info, size_t core_region_alignment, size_t header_size,
247 size_t base_archive_name_size, size_t base_archive_name_offset);
248 static bool is_valid_region(int region) {
249 return (0 <= region && region < NUM_CDS_REGIONS);
250 }
251
252 void print(outputStream* st);
253 };
254
255 class FileMapInfo : public CHeapObj<mtInternal> {
256 private:
257 friend class ManifestStream;
258 friend class VMStructs;
259 friend class ArchiveBuilder;
260 friend class CDSOffsets;
261 friend class FileMapHeader;
262
263 bool _is_static;
264 bool _file_open;
265 bool _is_mapped;
266 int _fd;
267 size_t _file_offset;
268 const char* _full_path;
269 const char* _base_archive_name;
270 FileMapHeader* _header;
271
272 // FileMapHeader describes the shared space data in the file to be
273 // mapped. This structure gets written to a file. It is not a class, so
274 // that the compilers don't add any compiler-private data to it.
275
276 static FileMapInfo* _current_info;
277 static FileMapInfo* _dynamic_archive_info;
278 static bool _memory_mapping_failed;
279
280 public:
281 FileMapHeader *header() const { return _header; }
282 static bool get_base_archive_name_from_header(const char* archive_name,
283 const char** base_archive_name);
284 static bool is_preimage_static_archive(const char* file);
285
286 bool init_from_file(int fd);
287
288 void log_paths(const char* msg, int start_idx, int end_idx);
289
290 FileMapInfo(const char* full_path, bool is_static);
291 ~FileMapInfo();
292 static void free_current_info();
293
294 // Accessors
295 int compute_header_crc() const { return header()->compute_crc(); }
296 void set_header_crc(int crc) { header()->set_crc(crc); }
297 int region_crc(int i) const { return region_at(i)->crc(); }
298 void populate_header(size_t core_region_alignment);
299 bool validate_header();
300 void invalidate();
301 int crc() const { return header()->crc(); }
302 int version() const { return header()->version(); }
303 unsigned int magic() const { return header()->magic(); }
304 address narrow_oop_base() const { return header()->narrow_oop_base(); }
305 int narrow_oop_shift() const { return header()->narrow_oop_shift(); }
306 uintx max_heap_size() const { return header()->max_heap_size(); }
307 size_t core_region_alignment() const { return header()->core_region_alignment(); }
308
309 const AOTMappedHeapHeader* mapped_heap() const { return header()->mapped_heap(); }
310 const AOTStreamedHeapHeader* streamed_heap() const { return header()->streamed_heap(); }
311
312 bool object_streaming_mode() const { return header()->object_streaming_mode(); }
313 CompressedOops::Mode narrow_oop_mode() const { return header()->narrow_oop_mode(); }
314
315 char* cloned_vtables() const { return header()->cloned_vtables(); }
316 void set_cloned_vtables(char* p) const { header()->set_cloned_vtables(p); }
317 char* early_serialized_data() const { return header()->early_serialized_data(); }
318 void set_early_serialized_data(char* p) const { header()->set_early_serialized_data(p); }
319 char* serialized_data() const { return header()->serialized_data(); }
320 void set_serialized_data(char* p) const { header()->set_serialized_data(p); }
321
322 bool is_file_position_aligned() const;
323 void align_file_position();
324
325 bool is_static() const { return _is_static; }
326 bool is_mapped() const { return _is_mapped; }
327 void set_is_mapped(bool v) { _is_mapped = v; }
328 const char* full_path() const { return _full_path; }
329 char* map_heap_region(FileMapRegion* r, char* addr, size_t bytes);
330
331 void set_requested_base(char* b) { header()->set_requested_base(b); }
332 char* requested_base_address() const { return header()->requested_base_address(); }
333
334 class DynamicArchiveHeader* dynamic_header() const {
335 assert(!is_static(), "must be");
336 return (DynamicArchiveHeader*)header();
337 }
338
339 void set_has_platform_or_app_classes(bool v) {
340 header()->set_has_platform_or_app_classes(v);
341 }
342 bool has_platform_or_app_classes() const {
343 return header()->has_platform_or_app_classes();
344 }
345
346 static FileMapInfo* current_info() {
347 CDS_ONLY(return _current_info;)
348 NOT_CDS(return nullptr;)
349 }
350
351 static void set_current_info(FileMapInfo* info) {
352 CDS_ONLY(_current_info = info;)
353 }
354
355 static FileMapInfo* dynamic_info() {
356 CDS_ONLY(return _dynamic_archive_info;)
357 NOT_CDS(return nullptr;)
358 }
359
360 static void assert_mark(bool check);
361
362 // File manipulation.
363 bool open_as_input() NOT_CDS_RETURN_(false);
364 void open_as_output();
365 void prepare_for_writing();
366 void write_header();
367 void write_region(int region, char* base, size_t size,
368 bool read_only, bool allow_exec);
369 size_t remove_bitmap_zeros(CHeapBitMap* map);
370 char* write_bitmap_region(CHeapBitMap* rw_ptrmap,
371 CHeapBitMap* ro_ptrmap,
372 AOTMappedHeapInfo* mapped_heap_info,
373 AOTStreamedHeapInfo* streamed_heap_info,
374 size_t &size_in_bytes);
375 size_t write_mapped_heap_region(AOTMappedHeapInfo* heap_info) NOT_CDS_JAVA_HEAP_RETURN_(0);
376 size_t write_streamed_heap_region(AOTStreamedHeapInfo* heap_info) NOT_CDS_JAVA_HEAP_RETURN_(0);
377 void write_bytes(const void* buffer, size_t count);
378 void write_bytes_aligned(const void* buffer, size_t count);
379 size_t read_bytes(void* buffer, size_t count);
380 static size_t readonly_total();
381 MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
382 void unmap_regions(int regions[], int num_regions);
383
384 // Object loading support
385 void stream_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
386 void map_or_load_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
387
388 bool has_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
389 bool read_region(int i, char* base, size_t size, bool do_commit);
390 char* map_bitmap_region();
391 bool map_aot_code_region(ReservedSpace rs);
392 char* map_forwarding_region();
393 void unmap_region(int i);
394 void close();
395 bool is_open() { return _file_open; }
396
397 // JVM/TI RedefineClasses() support:
398 // Remap the shared readonly space to shared readwrite, private.
399 bool remap_shared_readonly_as_readwrite();
400
401 static bool memory_mapping_failed() {
402 CDS_ONLY(return _memory_mapping_failed;)
403 NOT_CDS(return false;)
404 }
405
406 bool validate_class_location();
407 bool validate_aot_class_linking();
408
409 #if INCLUDE_JVMTI
410 // Caller needs a ResourceMark because parts of the returned cfs are resource-allocated.
411 static ClassFileStream* open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS);
412 static ClassFileStream* get_stream_from_class_loader(Handle class_loader,
413 ClassPathEntry* cpe,
414 const char* file_name,
415 TRAPS);
416 #endif
417
418 // The offset of the first core region in the archive, relative to SharedBaseAddress
419 size_t mapping_base_offset() const { return first_core_region()->mapping_offset(); }
420 // The offset of the (exclusive) end of the last core region in this archive, relative to SharedBaseAddress
421 size_t mapping_end_offset() const { return last_core_region()->mapping_end_offset(); }
422
423 char* mapped_base() const { return header()->mapped_base_address(); }
424 char* mapped_end() const { return last_core_region()->mapped_end(); }
425
426 // Non-zero if the archive needs to be mapped a non-default location due to ASLR.
427 intx relocation_delta() const {
428 return header()->mapped_base_address() - header()->requested_base_address();
429 }
430
431 FileMapRegion* first_core_region() const;
432 FileMapRegion* last_core_region() const;
433
434 FileMapRegion* region_at(int i) const {
435 return header()->region_at(i);
436 }
437
438 BitMapView bitmap_view(int region_index, bool is_oopmap);
439 BitMapView oopmap_view(int region_index);
440 BitMapView ptrmap_view(int region_index);
441
442 void print(outputStream* st) const;
443
444 const char* vm_version() {
445 return header()->jvm_ident();
446 }
447 bool can_use_heap_region();
448
449 private:
450 bool open_for_read();
451 void seek_to_position(size_t pos);
452
453 MapArchiveResult map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs);
454 bool relocate_pointers_in_core_regions(intx addr_delta);
455 char* map_auxiliary_region(int region_index, bool read_only);
456
457 public:
458
459 private:
460
461 #if INCLUDE_JVMTI
462 static ClassPathEntry** _classpath_entries_for_jvmti;
463 static ClassPathEntry* get_classpath_entry_for_jvmti(int i, TRAPS);
464 #endif
465 };
466
467 #endif // SHARE_CDS_FILEMAP_HPP