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 #ifndef SHARE_CDS_FILEMAP_HPP
26 #define SHARE_CDS_FILEMAP_HPP
27
28 #include "cds/archiveUtils.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "include/cds.h"
31 #include "logging/logLevel.hpp"
32 #include "memory/allocation.hpp"
33 #include "oops/array.hpp"
34 #include "oops/compressedOops.hpp"
35 #include "utilities/align.hpp"
36
37 // To understand the layout of the CDS archive file:
38 //
39 // java -Xlog:cds+map=info:file=cds.map:none:filesize=0
40 // java -Xlog:cds+map=debug:file=cds.map:none:filesize=0
41 // java -Xlog:cds+map=trace:file=cds.map:none:filesize=0
42
43 static const int JVM_IDENT_MAX = 256;
44
45 class AOTClassLocationConfig;
46 class ArchiveHeapInfo;
47 class BitMapView;
48 class CHeapBitMap;
49 class ClassFileStream;
50 class ClassLoaderData;
51 class ClassPathEntry;
52 class outputStream;
53 class ReservedSpace;
54
55 class FileMapRegion: private CDSFileMapRegion {
56 public:
57 void assert_is_heap_region() const {
58 assert(_is_heap_region, "must be heap region");
59 }
60 void assert_is_not_heap_region() const {
61 assert(!_is_heap_region, "must not be heap region");
62 }
63
64 static FileMapRegion* cast(CDSFileMapRegion* p) {
65 return (FileMapRegion*)p;
66 }
67
68 // Accessors
69 int crc() const { return _crc; }
70 size_t file_offset() const { return _file_offset; }
71 size_t mapping_offset() const { return _mapping_offset; }
72 size_t mapping_end_offset() const { return _mapping_offset + used_aligned(); }
73 size_t used() const { return _used; }
74 size_t used_aligned() const; // aligned up to MetaspaceShared::core_region_alignment()
75 char* mapped_base() const { return _mapped_base; }
76 char* mapped_end() const { return mapped_base() + used_aligned(); }
77 bool read_only() const { return _read_only != 0; }
78 bool allow_exec() const { return _allow_exec != 0; }
79 bool mapped_from_file() const { return _mapped_from_file != 0; }
80 size_t oopmap_offset() const { assert_is_heap_region(); return _oopmap_offset; }
81 size_t oopmap_size_in_bits() const { assert_is_heap_region(); return _oopmap_size_in_bits; }
82 size_t ptrmap_offset() const { return _ptrmap_offset; }
83 size_t ptrmap_size_in_bits() const { return _ptrmap_size_in_bits; }
84 bool in_reserved_space() const { return _in_reserved_space; }
85
86 void set_file_offset(size_t s) { _file_offset = s; }
87 void set_read_only(bool v) { _read_only = v; }
88 void set_mapped_base(char* p) { _mapped_base = p; }
89 void set_mapped_from_file(bool v) { _mapped_from_file = v; }
90 void set_in_reserved_space(bool is_reserved) { _in_reserved_space = is_reserved; }
91 void init(int region_index, size_t mapping_offset, size_t size, bool read_only,
92 bool allow_exec, int crc);
93 void init_oopmap(size_t offset, size_t size_in_bits);
94 void init_ptrmap(size_t offset, size_t size_in_bits);
95 bool has_ptrmap() { return _ptrmap_size_in_bits != 0; }
96
97 bool check_region_crc(char* base) const;
98 void print(outputStream* st, int region_index);
99 };
100
101 class FileMapHeader: private CDSFileMapHeaderBase {
102 friend class CDSConstants;
103 friend class VMStructs;
104
105 private:
106 // The following fields record the states of the VM during dump time.
107 // They are compared with the runtime states to see if the archive
108 // can be used.
109 size_t _core_region_alignment; // how shared archive should be aligned
110 int _obj_alignment; // value of ObjectAlignmentInBytes
111 address _narrow_oop_base; // compressed oop encoding base
112 int _narrow_oop_shift; // compressed oop encoding shift
113 bool _compact_strings; // value of CompactStrings
114 bool _compact_headers; // value of UseCompactObjectHeaders
115 uintx _max_heap_size; // java max heap size during dumping
116 CompressedOops::Mode _narrow_oop_mode; // compressed oop encoding mode
117 bool _compressed_oops; // save the flag UseCompressedOops
118 bool _compressed_class_ptrs; // save the flag UseCompressedClassPointers
119 int _narrow_klass_pointer_bits; // save number of bits in narrowKlass
120 int _narrow_klass_shift; // save shift width used to pre-compute narrowKlass IDs in archived heap objects
121 size_t _cloned_vtables_offset; // The address of the first cloned vtable
122 size_t _early_serialized_data_offset; // Data accessed using {ReadClosure,WriteClosure}::serialize()
123 size_t _serialized_data_offset; // Data accessed using {ReadClosure,WriteClosure}::serialize()
124
125 // The following fields are all sanity checks for whether this archive
126 // will function correctly with this JVM and the bootclasspath it's
127 // invoked with.
128 char _jvm_ident[JVM_IDENT_MAX]; // identifier string of the jvm that created this dump
129
130 size_t _class_location_config_offset;
131
132 bool _verify_local; // BytecodeVerificationLocal setting
133 bool _verify_remote; // BytecodeVerificationRemote setting
134 bool _has_platform_or_app_classes; // Archive contains app or platform classes
135 char* _requested_base_address; // Archive relocation is not necessary if we map with this base address.
136 char* _mapped_base_address; // Actual base address where archive is mapped.
137
138 bool _allow_archiving_with_java_agent; // setting of the AllowArchivingWithJavaAgent option
139 bool _use_optimized_module_handling;// No module-relation VM options were specified, so we can skip
140 // some expensive operations.
141 bool _has_aot_linked_classes; // Was the CDS archive created with -XX:+AOTClassLinking
142 bool _has_full_module_graph; // Does this CDS archive contain the full archived module graph?
143 HeapRootSegments _heap_root_segments; // Heap root segments info
144 size_t _heap_oopmap_start_pos; // The first bit in the oopmap corresponds to this position in the heap.
145 size_t _heap_ptrmap_start_pos; // The first bit in the ptrmap corresponds to this position in the heap.
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 // The following are parameters that affect MethodData layout.
150 uint _type_profile_level;
151 int _type_profile_args_limit;
152 int _type_profile_parms_limit;
153 intx _type_profile_width;
154 intx _bci_profile_width;
155 bool _profile_traps;
156 bool _type_profile_casts;
157 int _spec_trap_limit_extra_entries;
158
159 template <typename T> T from_mapped_offset(size_t offset) const {
160 return (T)(mapped_base_address() + offset);
161 }
162 void set_as_offset(char* p, size_t *offset);
163 template <typename T> void set_as_offset(T p, size_t *offset) {
164 set_as_offset((char*)p, offset);
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 from_mapped_offset<char*>(_cloned_vtables_offset); }
193 char* early_serialized_data() const { return from_mapped_offset<char*>(_early_serialized_data_offset); }
194 char* serialized_data() const { return from_mapped_offset<char*>(_serialized_data_offset); }
195 const char* jvm_ident() const { return _jvm_ident; }
196 char* requested_base_address() const { return _requested_base_address; }
197 char* mapped_base_address() const { return _mapped_base_address; }
198 bool has_platform_or_app_classes() const { return _has_platform_or_app_classes; }
199 bool has_aot_linked_classes() const { return _has_aot_linked_classes; }
200 bool compressed_oops() const { return _compressed_oops; }
201 bool compressed_class_pointers() const { return _compressed_class_ptrs; }
202 int narrow_klass_pointer_bits() const { return _narrow_klass_pointer_bits; }
203 int narrow_klass_shift() const { return _narrow_klass_shift; }
204 HeapRootSegments heap_root_segments() const { return _heap_root_segments; }
205 bool has_full_module_graph() const { return _has_full_module_graph; }
206 size_t heap_oopmap_start_pos() const { return _heap_oopmap_start_pos; }
207 size_t heap_ptrmap_start_pos() const { return _heap_ptrmap_start_pos; }
208 size_t rw_ptrmap_start_pos() const { return _rw_ptrmap_start_pos; }
209 size_t ro_ptrmap_start_pos() const { return _ro_ptrmap_start_pos; }
210
211 void set_has_platform_or_app_classes(bool v) { _has_platform_or_app_classes = v; }
212 void set_cloned_vtables(char* p) { set_as_offset(p, &_cloned_vtables_offset); }
213 void set_early_serialized_data(char* p) { set_as_offset(p, &_early_serialized_data_offset); }
214 void set_serialized_data(char* p) { set_as_offset(p, &_serialized_data_offset); }
215 void set_mapped_base_address(char* p) { _mapped_base_address = p; }
216 void set_heap_root_segments(HeapRootSegments segments) { _heap_root_segments = segments; }
217 void set_heap_oopmap_start_pos(size_t n) { _heap_oopmap_start_pos = n; }
218 void set_heap_ptrmap_start_pos(size_t n) { _heap_ptrmap_start_pos = n; }
219 void set_rw_ptrmap_start_pos(size_t n) { _rw_ptrmap_start_pos = n; }
220 void set_ro_ptrmap_start_pos(size_t n) { _ro_ptrmap_start_pos = n; }
221 void copy_base_archive_name(const char* name);
222
223 void set_class_location_config(AOTClassLocationConfig* table) {
224 set_as_offset(table, &_class_location_config_offset);
225 }
226
227 AOTClassLocationConfig* class_location_config() {
228 return from_mapped_offset<AOTClassLocationConfig*>(_class_location_config_offset);
229 }
230
231 void set_requested_base(char* b) {
232 _requested_base_address = b;
233 _mapped_base_address = nullptr;
234 }
235
236 bool validate();
237 int compute_crc();
238
239 FileMapRegion* region_at(int i) {
240 assert(is_valid_region(i), "invalid region");
241 return FileMapRegion::cast(&_regions[i]);
242 }
243
244 void populate(FileMapInfo *info, size_t core_region_alignment, size_t header_size,
245 size_t base_archive_name_size, size_t base_archive_name_offset);
246 static bool is_valid_region(int region) {
247 return (0 <= region && region < NUM_CDS_REGIONS);
248 }
249
250 void print(outputStream* st);
251 };
252
253 class FileMapInfo : public CHeapObj<mtInternal> {
254 private:
255 friend class ManifestStream;
256 friend class VMStructs;
257 friend class ArchiveBuilder;
258 friend class CDSOffsets;
259 friend class FileMapHeader;
260
261 bool _is_static;
262 bool _file_open;
263 bool _is_mapped;
264 int _fd;
265 size_t _file_offset;
266 const char* _full_path;
267 const char* _base_archive_name;
268 FileMapHeader* _header;
269
270 // FileMapHeader describes the shared space data in the file to be
271 // mapped. This structure gets written to a file. It is not a class, so
272 // that the compilers don't add any compiler-private data to it.
273
274 static FileMapInfo* _current_info;
275 static FileMapInfo* _dynamic_archive_info;
276 static bool _heap_pointers_need_patching;
277 static bool _memory_mapping_failed;
278
279 public:
280 FileMapHeader *header() const { return _header; }
281 static bool get_base_archive_name_from_header(const char* archive_name,
282 const char** base_archive_name);
283 static bool is_preimage_static_archive(const char* file);
284
285 bool init_from_file(int fd);
286
287 void log_paths(const char* msg, int start_idx, int end_idx);
288
289 FileMapInfo(const char* full_apth, bool is_static);
290 ~FileMapInfo();
291 static void free_current_info();
292
293 // Accessors
294 int compute_header_crc() const { return header()->compute_crc(); }
295 void set_header_crc(int crc) { header()->set_crc(crc); }
296 int region_crc(int i) const { return region_at(i)->crc(); }
297 void populate_header(size_t core_region_alignment);
298 bool validate_header();
299 void invalidate();
300 int crc() const { return header()->crc(); }
301 int version() const { return header()->version(); }
302 unsigned int magic() const { return header()->magic(); }
303 address narrow_oop_base() const { return header()->narrow_oop_base(); }
304 int narrow_oop_shift() const { return header()->narrow_oop_shift(); }
305 uintx max_heap_size() const { return header()->max_heap_size(); }
306 HeapRootSegments heap_root_segments() const { return header()->heap_root_segments(); }
307 size_t core_region_alignment() const { return header()->core_region_alignment(); }
308 size_t heap_oopmap_start_pos() const { return header()->heap_oopmap_start_pos(); }
309 size_t heap_ptrmap_start_pos() const { return header()->heap_ptrmap_start_pos(); }
310
311 CompressedOops::Mode narrow_oop_mode() const { return header()->narrow_oop_mode(); }
312
313 char* cloned_vtables() const { return header()->cloned_vtables(); }
314 void set_cloned_vtables(char* p) const { header()->set_cloned_vtables(p); }
315 char* early_serialized_data() const { return header()->early_serialized_data(); }
316 void set_early_serialized_data(char* p) const { header()->set_early_serialized_data(p); }
317 char* serialized_data() const { return header()->serialized_data(); }
318 void set_serialized_data(char* p) const { header()->set_serialized_data(p); }
319
320 bool is_file_position_aligned() const;
321 void align_file_position();
322
323 bool is_static() const { return _is_static; }
324 bool is_mapped() const { return _is_mapped; }
325 void set_is_mapped(bool v) { _is_mapped = v; }
326 const char* full_path() const { return _full_path; }
327
328 void set_requested_base(char* b) { header()->set_requested_base(b); }
329 char* requested_base_address() const { return header()->requested_base_address(); }
330
331 class DynamicArchiveHeader* dynamic_header() const {
332 assert(!is_static(), "must be");
333 return (DynamicArchiveHeader*)header();
334 }
335
336 void set_has_platform_or_app_classes(bool v) {
337 header()->set_has_platform_or_app_classes(v);
338 }
339 bool has_platform_or_app_classes() const {
340 return header()->has_platform_or_app_classes();
341 }
342
343 static FileMapInfo* current_info() {
344 CDS_ONLY(return _current_info;)
345 NOT_CDS(return nullptr;)
346 }
347
348 static void set_current_info(FileMapInfo* info) {
349 CDS_ONLY(_current_info = info;)
350 }
351
352 static FileMapInfo* dynamic_info() {
353 CDS_ONLY(return _dynamic_archive_info;)
354 NOT_CDS(return nullptr;)
355 }
356
357 static void assert_mark(bool check);
358
359 // File manipulation.
360 bool open_as_input() NOT_CDS_RETURN_(false);
361 void open_as_output();
362 void write_header();
363 void write_region(int region, char* base, size_t size,
364 bool read_only, bool allow_exec);
365 size_t remove_bitmap_zeros(CHeapBitMap* map);
366 char* write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, ArchiveHeapInfo* heap_info,
367 size_t &size_in_bytes);
368 size_t write_heap_region(ArchiveHeapInfo* heap_info);
369 void write_bytes(const void* buffer, size_t count);
370 void write_bytes_aligned(const void* buffer, size_t count);
371 size_t read_bytes(void* buffer, size_t count);
372 static size_t readonly_total();
373 MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
374 void unmap_regions(int regions[], int num_regions);
375 void map_or_load_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
376 void fixup_mapped_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
377 void patch_heap_embedded_pointers() NOT_CDS_JAVA_HEAP_RETURN;
378 bool has_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
379 MemRegion get_heap_region_requested_range() NOT_CDS_JAVA_HEAP_RETURN_(MemRegion());
380 bool read_region(int i, char* base, size_t size, bool do_commit);
381 char* map_bitmap_region();
382 bool map_aot_code_region(ReservedSpace rs);
383 void unmap_region(int i);
384 void close();
385 bool is_open() { return _file_open; }
386
387 // JVM/TI RedefineClasses() support:
388 // Remap the shared readonly space to shared readwrite, private.
389 bool remap_shared_readonly_as_readwrite();
390
391 static bool memory_mapping_failed() {
392 CDS_ONLY(return _memory_mapping_failed;)
393 NOT_CDS(return false;)
394 }
395
396 bool validate_class_location();
397 bool validate_aot_class_linking();
398
399 #if INCLUDE_JVMTI
400 // Caller needs a ResourceMark because parts of the returned cfs are resource-allocated.
401 static ClassFileStream* open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS);
402 static ClassFileStream* get_stream_from_class_loader(Handle class_loader,
403 ClassPathEntry* cpe,
404 const char* file_name,
405 TRAPS);
406 #endif
407
408 // The offset of the first core region in the archive, relative to SharedBaseAddress
409 size_t mapping_base_offset() const { return first_core_region()->mapping_offset(); }
410 // The offset of the (exclusive) end of the last core region in this archive, relative to SharedBaseAddress
411 size_t mapping_end_offset() const { return last_core_region()->mapping_end_offset(); }
412
413 char* mapped_base() const { return header()->mapped_base_address(); }
414 char* mapped_end() const { return last_core_region()->mapped_end(); }
415
416 // Non-zero if the archive needs to be mapped a non-default location due to ASLR.
417 intx relocation_delta() const {
418 return header()->mapped_base_address() - header()->requested_base_address();
419 }
420
421 FileMapRegion* first_core_region() const;
422 FileMapRegion* last_core_region() const;
423
424 FileMapRegion* region_at(int i) const {
425 return header()->region_at(i);
426 }
427
428 BitMapView bitmap_view(int region_index, bool is_oopmap);
429 BitMapView oopmap_view(int region_index);
430 BitMapView ptrmap_view(int region_index);
431
432 void print(outputStream* st) const;
433
434 const char* vm_version() {
435 return header()->jvm_ident();
436 }
437
438 private:
439 bool open_for_read();
440 void seek_to_position(size_t pos);
441 bool map_heap_region_impl() NOT_CDS_JAVA_HEAP_RETURN_(false);
442 void dealloc_heap_region() NOT_CDS_JAVA_HEAP_RETURN;
443 bool can_use_heap_region();
444 bool load_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
445 bool map_heap_region() NOT_CDS_JAVA_HEAP_RETURN_(false);
446 void init_heap_region_relocation();
447 MapArchiveResult map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs);
448 bool relocate_pointers_in_core_regions(intx addr_delta);
449
450 static MemRegion _mapped_heap_memregion;
451
452 public:
453 address heap_region_dumptime_address() NOT_CDS_JAVA_HEAP_RETURN_(nullptr);
454 address heap_region_requested_address() NOT_CDS_JAVA_HEAP_RETURN_(nullptr);
455 narrowOop encoded_heap_region_dumptime_address();
456
457 private:
458
459 #if INCLUDE_JVMTI
460 static ClassPathEntry** _classpath_entries_for_jvmti;
461 static ClassPathEntry* get_classpath_entry_for_jvmti(int i, TRAPS);
462 #endif
463 };
464
465 #endif // SHARE_CDS_FILEMAP_HPP