Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.cpp @ 14702:d4dd5204c0aa
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author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/symbolTable.hpp" | |
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28 #include "classfile/altHashing.hpp" |
1972 | 29 #include "memory/filemap.hpp" |
30 #include "runtime/arguments.hpp" | |
31 #include "runtime/java.hpp" | |
32 #include "runtime/os.hpp" | |
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33 #include "services/memTracker.hpp" |
1972 | 34 #include "utilities/defaultStream.hpp" |
35 | |
0 | 36 # include <sys/stat.h> |
37 # include <errno.h> | |
38 | |
39 #ifndef O_BINARY // if defined (Win32) use binary files. | |
40 #define O_BINARY 0 // otherwise do nothing. | |
41 #endif | |
42 | |
43 | |
44 extern address JVM_FunctionAtStart(); | |
45 extern address JVM_FunctionAtEnd(); | |
46 | |
605 | 47 // Complain and stop. All error conditions occurring during the writing of |
0 | 48 // an archive file should stop the process. Unrecoverable errors during |
49 // the reading of the archive file should stop the process. | |
50 | |
51 static void fail(const char *msg, va_list ap) { | |
52 // This occurs very early during initialization: tty is not initialized. | |
53 jio_fprintf(defaultStream::error_stream(), | |
605 | 54 "An error has occurred while processing the" |
0 | 55 " shared archive file.\n"); |
56 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
57 jio_fprintf(defaultStream::error_stream(), "\n"); | |
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58 // Do not change the text of the below message because some tests check for it. |
0 | 59 vm_exit_during_initialization("Unable to use shared archive.", NULL); |
60 } | |
61 | |
62 | |
63 void FileMapInfo::fail_stop(const char *msg, ...) { | |
64 va_list ap; | |
65 va_start(ap, msg); | |
66 fail(msg, ap); // Never returns. | |
67 va_end(ap); // for completeness. | |
68 } | |
69 | |
70 | |
71 // Complain and continue. Recoverable errors during the reading of the | |
72 // archive file may continue (with sharing disabled). | |
73 // | |
74 // If we continue, then disable shared spaces and close the file. | |
75 | |
76 void FileMapInfo::fail_continue(const char *msg, ...) { | |
77 va_list ap; | |
78 va_start(ap, msg); | |
79 if (RequireSharedSpaces) { | |
80 fail(msg, ap); | |
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81 } else { |
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82 if (PrintSharedSpaces) { |
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83 tty->print_cr("UseSharedSpaces: %s", msg); |
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84 } |
0 | 85 } |
86 va_end(ap); | |
87 UseSharedSpaces = false; | |
88 close(); | |
89 } | |
90 | |
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91 // Fill in the fileMapInfo structure with data about this VM instance. |
0 | 92 |
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93 // This method copies the vm version info into header_version. If the version is too |
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94 // long then a truncated version, which has a hash code appended to it, is copied. |
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95 // |
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96 // Using a template enables this method to verify that header_version is an array of |
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97 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and |
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98 // the code that reads the CDS file will both use the same size buffer. Hence, will |
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99 // use identical truncation. This is necessary for matching of truncated versions. |
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100 template <int N> static void get_header_version(char (&header_version) [N]) { |
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101 assert(N == JVM_IDENT_MAX, "Bad header_version size"); |
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102 |
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103 const char *vm_version = VM_Version::internal_vm_info_string(); |
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104 const int version_len = (int)strlen(vm_version); |
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105 |
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106 if (version_len < (JVM_IDENT_MAX-1)) { |
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107 strcpy(header_version, vm_version); |
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108 |
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109 } else { |
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110 // Get the hash value. Use a static seed because the hash needs to return the same |
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111 // value over multiple jvm invocations. |
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112 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); |
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113 |
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114 // Truncate the ident, saving room for the 8 hex character hash value. |
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115 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); |
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116 |
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117 // Append the hash code as eight hex digits. |
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118 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); |
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119 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. |
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120 } |
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121 } |
0 | 122 |
123 void FileMapInfo::populate_header(size_t alignment) { | |
124 _header._magic = 0xf00baba2; | |
125 _header._version = _current_version; | |
126 _header._alignment = alignment; | |
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127 _header._obj_alignment = ObjectAlignmentInBytes; |
0 | 128 |
129 // The following fields are for sanity checks for whether this archive | |
130 // will function correctly with this JVM and the bootclasspath it's | |
131 // invoked with. | |
132 | |
133 // JVM version string ... changes on each build. | |
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134 get_header_version(_header._jvm_ident); |
0 | 135 |
136 // Build checks on classpath and jar files | |
137 _header._num_jars = 0; | |
138 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
139 for ( ; cpe != NULL; cpe = cpe->next()) { | |
140 | |
141 if (cpe->is_jar_file()) { | |
142 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
143 fail_stop("Too many jar files to share.", NULL); | |
144 } | |
145 | |
146 // Jar file - record timestamp and file size. | |
147 struct stat st; | |
148 const char *path = cpe->name(); | |
149 if (os::stat(path, &st) != 0) { | |
150 // If we can't access a jar file in the boot path, then we can't | |
151 // make assumptions about where classes get loaded from. | |
152 fail_stop("Unable to open jar file %s.", path); | |
153 } | |
154 _header._jar[_header._num_jars]._timestamp = st.st_mtime; | |
155 _header._jar[_header._num_jars]._filesize = st.st_size; | |
156 _header._num_jars++; | |
157 } else { | |
158 | |
159 // If directories appear in boot classpath, they must be empty to | |
160 // avoid having to verify each individual class file. | |
161 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
162 if (!os::dir_is_empty(name)) { | |
163 fail_stop("Boot classpath directory %s is not empty.", name); | |
164 } | |
165 } | |
166 } | |
167 } | |
168 | |
169 | |
170 // Read the FileMapInfo information from the file. | |
171 | |
172 bool FileMapInfo::init_from_file(int fd) { | |
173 | |
174 size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); | |
175 if (n != sizeof(struct FileMapHeader)) { | |
176 fail_continue("Unable to read the file header."); | |
177 return false; | |
178 } | |
179 if (_header._version != current_version()) { | |
180 fail_continue("The shared archive file has the wrong version."); | |
181 return false; | |
182 } | |
183 _file_offset = (long)n; | |
184 return true; | |
185 } | |
186 | |
187 | |
188 // Read the FileMapInfo information from the file. | |
189 bool FileMapInfo::open_for_read() { | |
190 _full_path = Arguments::GetSharedArchivePath(); | |
191 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
192 if (fd < 0) { | |
193 if (errno == ENOENT) { | |
194 // Not locating the shared archive is ok. | |
195 fail_continue("Specified shared archive not found."); | |
196 } else { | |
197 fail_continue("Failed to open shared archive file (%s).", | |
198 strerror(errno)); | |
199 } | |
200 return false; | |
201 } | |
202 | |
203 _fd = fd; | |
204 _file_open = true; | |
205 return true; | |
206 } | |
207 | |
208 | |
209 // Write the FileMapInfo information to the file. | |
210 | |
211 void FileMapInfo::open_for_write() { | |
212 _full_path = Arguments::GetSharedArchivePath(); | |
213 if (PrintSharedSpaces) { | |
214 tty->print_cr("Dumping shared data to file: "); | |
215 tty->print_cr(" %s", _full_path); | |
216 } | |
217 | |
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218 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. |
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219 chmod(_full_path, _S_IREAD | _S_IWRITE); |
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220 #endif |
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221 |
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222 // Use remove() to delete the existing file because, on Unix, this will |
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223 // allow processes that have it open continued access to the file. |
0 | 224 remove(_full_path); |
225 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
226 if (fd < 0) { | |
227 fail_stop("Unable to create shared archive file %s.", _full_path); | |
228 } | |
229 _fd = fd; | |
230 _file_offset = 0; | |
231 _file_open = true; | |
232 } | |
233 | |
234 | |
235 // Write the header to the file, seek to the next allocation boundary. | |
236 | |
237 void FileMapInfo::write_header() { | |
238 write_bytes_aligned(&_header, sizeof(FileMapHeader)); | |
239 } | |
240 | |
241 | |
242 // Dump shared spaces to file. | |
243 | |
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244 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
0 | 245 align_file_position(); |
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246 size_t used = space->used_bytes_slow(Metaspace::NonClassType); |
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247 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); |
0 | 248 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
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249 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
0 | 250 } |
251 | |
252 | |
253 // Dump region to file. | |
254 | |
255 void FileMapInfo::write_region(int region, char* base, size_t size, | |
256 size_t capacity, bool read_only, | |
257 bool allow_exec) { | |
258 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; | |
259 | |
260 if (_file_open) { | |
261 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
262 if (PrintSharedSpaces) { | |
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263 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
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264 " file offset 0x%6x", region, size, base, _file_offset); |
0 | 265 } |
266 } else { | |
267 si->_file_offset = _file_offset; | |
268 } | |
269 si->_base = base; | |
270 si->_used = size; | |
271 si->_capacity = capacity; | |
272 si->_read_only = read_only; | |
273 si->_allow_exec = allow_exec; | |
274 write_bytes_aligned(base, (int)size); | |
275 } | |
276 | |
277 | |
278 // Dump bytes to file -- at the current file position. | |
279 | |
280 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
281 if (_file_open) { | |
282 int n = ::write(_fd, buffer, nbytes); | |
283 if (n != nbytes) { | |
284 // It is dangerous to leave the corrupted shared archive file around, | |
285 // close and remove the file. See bug 6372906. | |
286 close(); | |
287 remove(_full_path); | |
288 fail_stop("Unable to write to shared archive file.", NULL); | |
289 } | |
290 } | |
291 _file_offset += nbytes; | |
292 } | |
293 | |
294 | |
295 // Align file position to an allocation unit boundary. | |
296 | |
297 void FileMapInfo::align_file_position() { | |
298 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); | |
299 if (new_file_offset != _file_offset) { | |
300 _file_offset = new_file_offset; | |
301 if (_file_open) { | |
302 // Seek one byte back from the target and write a byte to insure | |
303 // that the written file is the correct length. | |
304 _file_offset -= 1; | |
305 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { | |
306 fail_stop("Unable to seek.", NULL); | |
307 } | |
308 char zero = 0; | |
309 write_bytes(&zero, 1); | |
310 } | |
311 } | |
312 } | |
313 | |
314 | |
315 // Dump bytes to file -- at the current file position. | |
316 | |
317 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
318 align_file_position(); | |
319 write_bytes(buffer, nbytes); | |
320 align_file_position(); | |
321 } | |
322 | |
323 | |
324 // Close the shared archive file. This does NOT unmap mapped regions. | |
325 | |
326 void FileMapInfo::close() { | |
327 if (_file_open) { | |
328 if (::close(_fd) < 0) { | |
329 fail_stop("Unable to close the shared archive file."); | |
330 } | |
331 _file_open = false; | |
332 _fd = -1; | |
333 } | |
334 } | |
335 | |
336 | |
337 // JVM/TI RedefineClasses() support: | |
338 // Remap the shared readonly space to shared readwrite, private. | |
339 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
340 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; | |
341 if (!si->_read_only) { | |
342 // the space is already readwrite so we are done | |
343 return true; | |
344 } | |
345 size_t used = si->_used; | |
346 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
347 if (!open_for_read()) { | |
348 return false; | |
349 } | |
350 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
351 si->_base, size, false /* !read_only */, | |
352 si->_allow_exec); | |
353 close(); | |
354 if (base == NULL) { | |
355 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
356 return false; | |
357 } | |
358 if (base != si->_base) { | |
359 fail_continue("Unable to remap shared readonly space at required address."); | |
360 return false; | |
361 } | |
362 si->_read_only = false; | |
363 return true; | |
364 } | |
365 | |
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366 // Map the whole region at once, assumed to be allocated contiguously. |
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367 ReservedSpace FileMapInfo::reserve_shared_memory() { |
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368 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; |
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369 char* requested_addr = si->_base; |
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370 |
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371 size_t size = FileMapInfo::shared_spaces_size(); |
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372 |
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373 // Reserve the space first, then map otherwise map will go right over some |
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374 // other reserved memory (like the code cache). |
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375 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); |
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376 if (!rs.is_reserved()) { |
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377 fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr)); |
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378 return rs; |
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379 } |
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380 // the reserved virtual memory is for mapping class data sharing archive |
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381 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); |
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382 |
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383 return rs; |
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384 } |
0 | 385 |
386 // Memory map a region in the address space. | |
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387 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
0 | 388 |
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389 char* FileMapInfo::map_region(int i) { |
0 | 390 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
391 size_t used = si->_used; | |
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392 size_t alignment = os::vm_allocation_granularity(); |
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393 size_t size = align_size_up(used, alignment); |
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394 char *requested_addr = si->_base; |
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395 |
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396 // map the contents of the CDS archive in this memory |
0 | 397 char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
398 requested_addr, size, si->_read_only, | |
399 si->_allow_exec); | |
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400 if (base == NULL || base != si->_base) { |
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401 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
0 | 402 return NULL; |
403 } | |
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404 #ifdef _WINDOWS |
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405 // This call is Windows-only because the memory_type gets recorded for the other platforms |
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406 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. |
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407 MemTracker::record_virtual_memory_type((address)base, mtClassShared); |
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408 #endif |
0 | 409 return base; |
410 } | |
411 | |
412 | |
413 // Unmap a memory region in the address space. | |
414 | |
415 void FileMapInfo::unmap_region(int i) { | |
416 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
417 size_t used = si->_used; | |
418 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
419 if (!os::unmap_memory(si->_base, size)) { | |
420 fail_stop("Unable to unmap shared space."); | |
421 } | |
422 } | |
423 | |
424 | |
425 void FileMapInfo::assert_mark(bool check) { | |
426 if (!check) { | |
427 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
428 } | |
429 } | |
430 | |
431 | |
432 FileMapInfo* FileMapInfo::_current_info = NULL; | |
433 | |
434 | |
435 // Open the shared archive file, read and validate the header | |
436 // information (version, boot classpath, etc.). If initialization | |
437 // fails, shared spaces are disabled and the file is closed. [See | |
438 // fail_continue.] | |
439 bool FileMapInfo::initialize() { | |
440 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
441 | |
442 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
443 fail_continue("Tool agent requires sharing to be disabled."); | |
444 return false; | |
445 } | |
446 | |
447 if (!open_for_read()) { | |
448 return false; | |
449 } | |
450 | |
451 init_from_file(_fd); | |
452 if (!validate()) { | |
453 return false; | |
454 } | |
455 | |
456 SharedReadOnlySize = _header._space[0]._capacity; | |
457 SharedReadWriteSize = _header._space[1]._capacity; | |
458 SharedMiscDataSize = _header._space[2]._capacity; | |
459 SharedMiscCodeSize = _header._space[3]._capacity; | |
460 return true; | |
461 } | |
462 | |
463 | |
464 bool FileMapInfo::validate() { | |
465 if (_header._version != current_version()) { | |
466 fail_continue("The shared archive file is the wrong version."); | |
467 return false; | |
468 } | |
469 if (_header._magic != (int)0xf00baba2) { | |
470 fail_continue("The shared archive file has a bad magic number."); | |
471 return false; | |
472 } | |
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473 char header_version[JVM_IDENT_MAX]; |
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474 get_header_version(header_version); |
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475 if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { |
0 | 476 fail_continue("The shared archive file was created by a different" |
477 " version or build of HotSpot."); | |
478 return false; | |
479 } | |
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480 if (_header._obj_alignment != ObjectAlignmentInBytes) { |
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481 fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" |
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482 " does not equal the current ObjectAlignmentInBytes of %d.", |
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483 _header._obj_alignment, ObjectAlignmentInBytes); |
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484 return false; |
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485 } |
0 | 486 |
487 // Cannot verify interpreter yet, as it can only be created after the GC | |
488 // heap has been initialized. | |
489 | |
490 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
491 fail_continue("Too many jar files to share."); | |
492 return false; | |
493 } | |
494 | |
495 // Build checks on classpath and jar files | |
496 int num_jars_now = 0; | |
497 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
498 for ( ; cpe != NULL; cpe = cpe->next()) { | |
499 | |
500 if (cpe->is_jar_file()) { | |
501 if (num_jars_now < _header._num_jars) { | |
502 | |
503 // Jar file - verify timestamp and file size. | |
504 struct stat st; | |
505 const char *path = cpe->name(); | |
506 if (os::stat(path, &st) != 0) { | |
507 fail_continue("Unable to open jar file %s.", path); | |
508 return false; | |
509 } | |
510 if (_header._jar[num_jars_now]._timestamp != st.st_mtime || | |
511 _header._jar[num_jars_now]._filesize != st.st_size) { | |
512 fail_continue("A jar file is not the one used while building" | |
513 " the shared archive file."); | |
514 return false; | |
515 } | |
516 } | |
517 ++num_jars_now; | |
518 } else { | |
519 | |
520 // If directories appear in boot classpath, they must be empty to | |
521 // avoid having to verify each individual class file. | |
522 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
523 if (!os::dir_is_empty(name)) { | |
524 fail_continue("Boot classpath directory %s is not empty.", name); | |
525 return false; | |
526 } | |
527 } | |
528 } | |
529 if (num_jars_now < _header._num_jars) { | |
530 fail_continue("The number of jar files in the boot classpath is" | |
531 " less than the number the shared archive was created with."); | |
532 return false; | |
533 } | |
534 | |
535 return true; | |
536 } | |
537 | |
538 // The following method is provided to see whether a given pointer | |
539 // falls in the mapped shared space. | |
540 // Param: | |
541 // p, The given pointer | |
542 // Return: | |
543 // True if the p is within the mapped shared space, otherwise, false. | |
544 bool FileMapInfo::is_in_shared_space(const void* p) { | |
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545 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
0 | 546 if (p >= _header._space[i]._base && |
547 p < _header._space[i]._base + _header._space[i]._used) { | |
548 return true; | |
549 } | |
550 } | |
551 | |
552 return false; | |
553 } | |
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554 |
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555 void FileMapInfo::print_shared_spaces() { |
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556 gclog_or_tty->print_cr("Shared Spaces:"); |
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557 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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558 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
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559 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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560 shared_region_name[i], |
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561 si->_base, si->_base + si->_used); |
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562 } |
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563 } |
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564 |
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565 // Unmap mapped regions of shared space. |
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566 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { |
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567 FileMapInfo *map_info = FileMapInfo::current_info(); |
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568 if (map_info) { |
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569 map_info->fail_continue(msg); |
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570 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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571 if (map_info->_header._space[i]._base != NULL) { |
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572 map_info->unmap_region(i); |
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573 map_info->_header._space[i]._base = NULL; |
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574 } |
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575 } |
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576 } else if (DumpSharedSpaces) { |
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577 fail_stop(msg, NULL); |
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578 } |
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579 } |