Mercurial > hg > truffle
comparison src/share/vm/memory/filemap.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 98cb887364d3 |
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1 /* | |
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_filemap.cpp.incl" | |
27 # include <sys/stat.h> | |
28 # include <errno.h> | |
29 | |
30 #ifndef O_BINARY // if defined (Win32) use binary files. | |
31 #define O_BINARY 0 // otherwise do nothing. | |
32 #endif | |
33 | |
34 | |
35 extern address JVM_FunctionAtStart(); | |
36 extern address JVM_FunctionAtEnd(); | |
37 | |
38 // Complain and stop. All error conditions occuring during the writing of | |
39 // an archive file should stop the process. Unrecoverable errors during | |
40 // the reading of the archive file should stop the process. | |
41 | |
42 static void fail(const char *msg, va_list ap) { | |
43 // This occurs very early during initialization: tty is not initialized. | |
44 jio_fprintf(defaultStream::error_stream(), | |
45 "An error has occured while processing the" | |
46 " shared archive file.\n"); | |
47 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
48 jio_fprintf(defaultStream::error_stream(), "\n"); | |
49 vm_exit_during_initialization("Unable to use shared archive.", NULL); | |
50 } | |
51 | |
52 | |
53 void FileMapInfo::fail_stop(const char *msg, ...) { | |
54 va_list ap; | |
55 va_start(ap, msg); | |
56 fail(msg, ap); // Never returns. | |
57 va_end(ap); // for completeness. | |
58 } | |
59 | |
60 | |
61 // Complain and continue. Recoverable errors during the reading of the | |
62 // archive file may continue (with sharing disabled). | |
63 // | |
64 // If we continue, then disable shared spaces and close the file. | |
65 | |
66 void FileMapInfo::fail_continue(const char *msg, ...) { | |
67 va_list ap; | |
68 va_start(ap, msg); | |
69 if (RequireSharedSpaces) { | |
70 fail(msg, ap); | |
71 } | |
72 va_end(ap); | |
73 UseSharedSpaces = false; | |
74 close(); | |
75 } | |
76 | |
77 | |
78 // Fill in the fileMapInfo structure with data about this VM instance. | |
79 | |
80 void FileMapInfo::populate_header(size_t alignment) { | |
81 _header._magic = 0xf00baba2; | |
82 _header._version = _current_version; | |
83 _header._alignment = alignment; | |
84 | |
85 // The following fields are for sanity checks for whether this archive | |
86 // will function correctly with this JVM and the bootclasspath it's | |
87 // invoked with. | |
88 | |
89 // JVM version string ... changes on each build. | |
90 const char *vm_version = VM_Version::internal_vm_info_string(); | |
91 if (strlen(vm_version) < (JVM_IDENT_MAX-1)) { | |
92 strcpy(_header._jvm_ident, vm_version); | |
93 } else { | |
94 fail_stop("JVM Ident field for shared archive is too long" | |
95 " - truncated to <%s>", _header._jvm_ident); | |
96 } | |
97 | |
98 // Build checks on classpath and jar files | |
99 _header._num_jars = 0; | |
100 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
101 for ( ; cpe != NULL; cpe = cpe->next()) { | |
102 | |
103 if (cpe->is_jar_file()) { | |
104 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
105 fail_stop("Too many jar files to share.", NULL); | |
106 } | |
107 | |
108 // Jar file - record timestamp and file size. | |
109 struct stat st; | |
110 const char *path = cpe->name(); | |
111 if (os::stat(path, &st) != 0) { | |
112 // If we can't access a jar file in the boot path, then we can't | |
113 // make assumptions about where classes get loaded from. | |
114 fail_stop("Unable to open jar file %s.", path); | |
115 } | |
116 _header._jar[_header._num_jars]._timestamp = st.st_mtime; | |
117 _header._jar[_header._num_jars]._filesize = st.st_size; | |
118 _header._num_jars++; | |
119 } else { | |
120 | |
121 // If directories appear in boot classpath, they must be empty to | |
122 // avoid having to verify each individual class file. | |
123 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
124 if (!os::dir_is_empty(name)) { | |
125 fail_stop("Boot classpath directory %s is not empty.", name); | |
126 } | |
127 } | |
128 } | |
129 } | |
130 | |
131 | |
132 // Read the FileMapInfo information from the file. | |
133 | |
134 bool FileMapInfo::init_from_file(int fd) { | |
135 | |
136 size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); | |
137 if (n != sizeof(struct FileMapHeader)) { | |
138 fail_continue("Unable to read the file header."); | |
139 return false; | |
140 } | |
141 if (_header._version != current_version()) { | |
142 fail_continue("The shared archive file has the wrong version."); | |
143 return false; | |
144 } | |
145 _file_offset = (long)n; | |
146 return true; | |
147 } | |
148 | |
149 | |
150 // Read the FileMapInfo information from the file. | |
151 bool FileMapInfo::open_for_read() { | |
152 _full_path = Arguments::GetSharedArchivePath(); | |
153 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
154 if (fd < 0) { | |
155 if (errno == ENOENT) { | |
156 // Not locating the shared archive is ok. | |
157 fail_continue("Specified shared archive not found."); | |
158 } else { | |
159 fail_continue("Failed to open shared archive file (%s).", | |
160 strerror(errno)); | |
161 } | |
162 return false; | |
163 } | |
164 | |
165 _fd = fd; | |
166 _file_open = true; | |
167 return true; | |
168 } | |
169 | |
170 | |
171 // Write the FileMapInfo information to the file. | |
172 | |
173 void FileMapInfo::open_for_write() { | |
174 _full_path = Arguments::GetSharedArchivePath(); | |
175 if (PrintSharedSpaces) { | |
176 tty->print_cr("Dumping shared data to file: "); | |
177 tty->print_cr(" %s", _full_path); | |
178 } | |
179 | |
180 // Remove the existing file in case another process has it open. | |
181 remove(_full_path); | |
182 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
183 if (fd < 0) { | |
184 fail_stop("Unable to create shared archive file %s.", _full_path); | |
185 } | |
186 _fd = fd; | |
187 _file_offset = 0; | |
188 _file_open = true; | |
189 } | |
190 | |
191 | |
192 // Write the header to the file, seek to the next allocation boundary. | |
193 | |
194 void FileMapInfo::write_header() { | |
195 write_bytes_aligned(&_header, sizeof(FileMapHeader)); | |
196 } | |
197 | |
198 | |
199 // Dump shared spaces to file. | |
200 | |
201 void FileMapInfo::write_space(int i, CompactibleSpace* space, bool read_only) { | |
202 align_file_position(); | |
203 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
204 write_region(i, (char*)space->bottom(), space->used(), | |
205 space->capacity(), read_only, false); | |
206 } | |
207 | |
208 | |
209 // Dump region to file. | |
210 | |
211 void FileMapInfo::write_region(int region, char* base, size_t size, | |
212 size_t capacity, bool read_only, | |
213 bool allow_exec) { | |
214 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; | |
215 | |
216 if (_file_open) { | |
217 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
218 if (PrintSharedSpaces) { | |
219 tty->print_cr("Shared file region %d: 0x%x bytes, addr 0x%x," | |
220 " file offset 0x%x", region, size, base, _file_offset); | |
221 } | |
222 } else { | |
223 si->_file_offset = _file_offset; | |
224 } | |
225 si->_base = base; | |
226 si->_used = size; | |
227 si->_capacity = capacity; | |
228 si->_read_only = read_only; | |
229 si->_allow_exec = allow_exec; | |
230 write_bytes_aligned(base, (int)size); | |
231 } | |
232 | |
233 | |
234 // Dump bytes to file -- at the current file position. | |
235 | |
236 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
237 if (_file_open) { | |
238 int n = ::write(_fd, buffer, nbytes); | |
239 if (n != nbytes) { | |
240 // It is dangerous to leave the corrupted shared archive file around, | |
241 // close and remove the file. See bug 6372906. | |
242 close(); | |
243 remove(_full_path); | |
244 fail_stop("Unable to write to shared archive file.", NULL); | |
245 } | |
246 } | |
247 _file_offset += nbytes; | |
248 } | |
249 | |
250 | |
251 // Align file position to an allocation unit boundary. | |
252 | |
253 void FileMapInfo::align_file_position() { | |
254 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); | |
255 if (new_file_offset != _file_offset) { | |
256 _file_offset = new_file_offset; | |
257 if (_file_open) { | |
258 // Seek one byte back from the target and write a byte to insure | |
259 // that the written file is the correct length. | |
260 _file_offset -= 1; | |
261 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { | |
262 fail_stop("Unable to seek.", NULL); | |
263 } | |
264 char zero = 0; | |
265 write_bytes(&zero, 1); | |
266 } | |
267 } | |
268 } | |
269 | |
270 | |
271 // Dump bytes to file -- at the current file position. | |
272 | |
273 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
274 align_file_position(); | |
275 write_bytes(buffer, nbytes); | |
276 align_file_position(); | |
277 } | |
278 | |
279 | |
280 // Close the shared archive file. This does NOT unmap mapped regions. | |
281 | |
282 void FileMapInfo::close() { | |
283 if (_file_open) { | |
284 if (::close(_fd) < 0) { | |
285 fail_stop("Unable to close the shared archive file."); | |
286 } | |
287 _file_open = false; | |
288 _fd = -1; | |
289 } | |
290 } | |
291 | |
292 | |
293 // Memory map a shared space from the archive file. | |
294 | |
295 bool FileMapInfo::map_space(int i, ReservedSpace rs, ContiguousSpace* space) { | |
296 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
297 if (space != NULL) { | |
298 if (si->_base != (char*)space->bottom() || | |
299 si->_capacity != space->capacity()) { | |
300 fail_continue("Shared space base address does not match."); | |
301 return false; | |
302 } | |
303 } | |
304 bool result = (map_region(i, rs) != NULL); | |
305 if (space != NULL && result) { | |
306 space->set_top((HeapWord*)(si->_base + si->_used)); | |
307 space->set_saved_mark(); | |
308 } | |
309 return result; | |
310 } | |
311 | |
312 | |
313 // JVM/TI RedefineClasses() support: | |
314 // Remap the shared readonly space to shared readwrite, private. | |
315 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
316 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; | |
317 if (!si->_read_only) { | |
318 // the space is already readwrite so we are done | |
319 return true; | |
320 } | |
321 size_t used = si->_used; | |
322 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
323 if (!open_for_read()) { | |
324 return false; | |
325 } | |
326 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
327 si->_base, size, false /* !read_only */, | |
328 si->_allow_exec); | |
329 close(); | |
330 if (base == NULL) { | |
331 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
332 return false; | |
333 } | |
334 if (base != si->_base) { | |
335 fail_continue("Unable to remap shared readonly space at required address."); | |
336 return false; | |
337 } | |
338 si->_read_only = false; | |
339 return true; | |
340 } | |
341 | |
342 | |
343 // Memory map a region in the address space. | |
344 | |
345 char* FileMapInfo::map_region(int i, ReservedSpace rs) { | |
346 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
347 size_t used = si->_used; | |
348 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
349 | |
350 ReservedSpace mapped_rs = rs.first_part(size, true, true); | |
351 ReservedSpace unmapped_rs = rs.last_part(size); | |
352 mapped_rs.release(); | |
353 | |
354 return map_region(i, true); | |
355 } | |
356 | |
357 | |
358 // Memory map a region in the address space. | |
359 | |
360 char* FileMapInfo::map_region(int i, bool address_must_match) { | |
361 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
362 size_t used = si->_used; | |
363 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
364 char *requested_addr = 0; | |
365 if (address_must_match) { | |
366 requested_addr = si->_base; | |
367 } | |
368 char *base = os::map_memory(_fd, _full_path, si->_file_offset, | |
369 requested_addr, size, si->_read_only, | |
370 si->_allow_exec); | |
371 if (base == NULL) { | |
372 fail_continue("Unable to map shared space."); | |
373 return NULL; | |
374 } | |
375 if (address_must_match) { | |
376 if (base != si->_base) { | |
377 fail_continue("Unable to map shared space at required address."); | |
378 return NULL; | |
379 } | |
380 } else { | |
381 si->_base = base; // save mapped address for unmapping. | |
382 } | |
383 return base; | |
384 } | |
385 | |
386 | |
387 // Unmap a memory region in the address space. | |
388 | |
389 void FileMapInfo::unmap_region(int i) { | |
390 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
391 size_t used = si->_used; | |
392 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
393 if (!os::unmap_memory(si->_base, size)) { | |
394 fail_stop("Unable to unmap shared space."); | |
395 } | |
396 } | |
397 | |
398 | |
399 void FileMapInfo::assert_mark(bool check) { | |
400 if (!check) { | |
401 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
402 } | |
403 } | |
404 | |
405 | |
406 FileMapInfo* FileMapInfo::_current_info = NULL; | |
407 | |
408 | |
409 // Open the shared archive file, read and validate the header | |
410 // information (version, boot classpath, etc.). If initialization | |
411 // fails, shared spaces are disabled and the file is closed. [See | |
412 // fail_continue.] | |
413 | |
414 | |
415 bool FileMapInfo::initialize() { | |
416 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
417 | |
418 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
419 fail_continue("Tool agent requires sharing to be disabled."); | |
420 return false; | |
421 } | |
422 | |
423 if (!open_for_read()) { | |
424 return false; | |
425 } | |
426 | |
427 init_from_file(_fd); | |
428 if (!validate()) { | |
429 return false; | |
430 } | |
431 | |
432 SharedReadOnlySize = _header._space[0]._capacity; | |
433 SharedReadWriteSize = _header._space[1]._capacity; | |
434 SharedMiscDataSize = _header._space[2]._capacity; | |
435 SharedMiscCodeSize = _header._space[3]._capacity; | |
436 return true; | |
437 } | |
438 | |
439 | |
440 bool FileMapInfo::validate() { | |
441 if (_header._version != current_version()) { | |
442 fail_continue("The shared archive file is the wrong version."); | |
443 return false; | |
444 } | |
445 if (_header._magic != (int)0xf00baba2) { | |
446 fail_continue("The shared archive file has a bad magic number."); | |
447 return false; | |
448 } | |
449 if (strncmp(_header._jvm_ident, VM_Version::internal_vm_info_string(), | |
450 JVM_IDENT_MAX-1) != 0) { | |
451 fail_continue("The shared archive file was created by a different" | |
452 " version or build of HotSpot."); | |
453 return false; | |
454 } | |
455 | |
456 // Cannot verify interpreter yet, as it can only be created after the GC | |
457 // heap has been initialized. | |
458 | |
459 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
460 fail_continue("Too many jar files to share."); | |
461 return false; | |
462 } | |
463 | |
464 // Build checks on classpath and jar files | |
465 int num_jars_now = 0; | |
466 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
467 for ( ; cpe != NULL; cpe = cpe->next()) { | |
468 | |
469 if (cpe->is_jar_file()) { | |
470 if (num_jars_now < _header._num_jars) { | |
471 | |
472 // Jar file - verify timestamp and file size. | |
473 struct stat st; | |
474 const char *path = cpe->name(); | |
475 if (os::stat(path, &st) != 0) { | |
476 fail_continue("Unable to open jar file %s.", path); | |
477 return false; | |
478 } | |
479 if (_header._jar[num_jars_now]._timestamp != st.st_mtime || | |
480 _header._jar[num_jars_now]._filesize != st.st_size) { | |
481 fail_continue("A jar file is not the one used while building" | |
482 " the shared archive file."); | |
483 return false; | |
484 } | |
485 } | |
486 ++num_jars_now; | |
487 } else { | |
488 | |
489 // If directories appear in boot classpath, they must be empty to | |
490 // avoid having to verify each individual class file. | |
491 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
492 if (!os::dir_is_empty(name)) { | |
493 fail_continue("Boot classpath directory %s is not empty.", name); | |
494 return false; | |
495 } | |
496 } | |
497 } | |
498 if (num_jars_now < _header._num_jars) { | |
499 fail_continue("The number of jar files in the boot classpath is" | |
500 " less than the number the shared archive was created with."); | |
501 return false; | |
502 } | |
503 | |
504 return true; | |
505 } | |
506 | |
507 // The following method is provided to see whether a given pointer | |
508 // falls in the mapped shared space. | |
509 // Param: | |
510 // p, The given pointer | |
511 // Return: | |
512 // True if the p is within the mapped shared space, otherwise, false. | |
513 bool FileMapInfo::is_in_shared_space(const void* p) { | |
514 for (int i = 0; i < CompactingPermGenGen::n_regions; i++) { | |
515 if (p >= _header._space[i]._base && | |
516 p < _header._space[i]._base + _header._space[i]._used) { | |
517 return true; | |
518 } | |
519 } | |
520 | |
521 return false; | |
522 } |