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rev 1024 : imported patch indy-cleanup-6893081.patch
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--- old/src/share/vm/runtime/arguments.cpp
+++ new/src/share/vm/runtime/arguments.cpp
1 1 /*
2 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 21 * have any questions.
22 22 *
23 23 */
24 24
25 25 #include "incls/_precompiled.incl"
26 26 #include "incls/_arguments.cpp.incl"
27 27
28 28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 29 #define DEFAULT_JAVA_LAUNCHER "generic"
30 30
31 31 char** Arguments::_jvm_flags_array = NULL;
32 32 int Arguments::_num_jvm_flags = 0;
33 33 char** Arguments::_jvm_args_array = NULL;
34 34 int Arguments::_num_jvm_args = 0;
35 35 char* Arguments::_java_command = NULL;
36 36 SystemProperty* Arguments::_system_properties = NULL;
37 37 const char* Arguments::_gc_log_filename = NULL;
38 38 bool Arguments::_has_profile = false;
39 39 bool Arguments::_has_alloc_profile = false;
40 40 uintx Arguments::_initial_heap_size = 0;
41 41 uintx Arguments::_min_heap_size = 0;
42 42 Arguments::Mode Arguments::_mode = _mixed;
43 43 bool Arguments::_java_compiler = false;
44 44 bool Arguments::_xdebug_mode = false;
45 45 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
46 46 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
47 47 int Arguments::_sun_java_launcher_pid = -1;
48 48
49 49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
50 50 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
51 51 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
52 52 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
53 53 bool Arguments::_ClipInlining = ClipInlining;
54 54 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
55 55
56 56 char* Arguments::SharedArchivePath = NULL;
57 57
58 58 AgentLibraryList Arguments::_libraryList;
59 59 AgentLibraryList Arguments::_agentList;
60 60
61 61 abort_hook_t Arguments::_abort_hook = NULL;
62 62 exit_hook_t Arguments::_exit_hook = NULL;
63 63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
64 64
65 65
66 66 SystemProperty *Arguments::_java_ext_dirs = NULL;
67 67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
68 68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
69 69 SystemProperty *Arguments::_java_library_path = NULL;
70 70 SystemProperty *Arguments::_java_home = NULL;
71 71 SystemProperty *Arguments::_java_class_path = NULL;
72 72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
73 73
74 74 char* Arguments::_meta_index_path = NULL;
75 75 char* Arguments::_meta_index_dir = NULL;
76 76
77 77 static bool force_client_mode = false;
78 78
79 79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
80 80
81 81 static bool match_option(const JavaVMOption *option, const char* name,
82 82 const char** tail) {
83 83 int len = (int)strlen(name);
84 84 if (strncmp(option->optionString, name, len) == 0) {
85 85 *tail = option->optionString + len;
86 86 return true;
87 87 } else {
88 88 return false;
89 89 }
90 90 }
91 91
92 92 static void logOption(const char* opt) {
93 93 if (PrintVMOptions) {
94 94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 95 }
96 96 }
97 97
98 98 // Process java launcher properties.
99 99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
100 100 // See if sun.java.launcher or sun.java.launcher.pid is defined.
101 101 // Must do this before setting up other system properties,
102 102 // as some of them may depend on launcher type.
103 103 for (int index = 0; index < args->nOptions; index++) {
104 104 const JavaVMOption* option = args->options + index;
105 105 const char* tail;
106 106
107 107 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
108 108 process_java_launcher_argument(tail, option->extraInfo);
109 109 continue;
110 110 }
111 111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
112 112 _sun_java_launcher_pid = atoi(tail);
113 113 continue;
114 114 }
115 115 }
116 116 }
117 117
118 118 // Initialize system properties key and value.
119 119 void Arguments::init_system_properties() {
120 120
121 121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
122 122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
123 123 "Java Virtual Machine Specification", false));
124 124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
125 125 "Sun Microsystems Inc.", false));
126 126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
127 127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
128 128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
129 129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
130 130
131 131 // following are JVMTI agent writeable properties.
132 132 // Properties values are set to NULL and they are
133 133 // os specific they are initialized in os::init_system_properties_values().
134 134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
135 135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
136 136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
137 137 _java_library_path = new SystemProperty("java.library.path", NULL, true);
138 138 _java_home = new SystemProperty("java.home", NULL, true);
139 139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
140 140
141 141 _java_class_path = new SystemProperty("java.class.path", "", true);
142 142
143 143 // Add to System Property list.
144 144 PropertyList_add(&_system_properties, _java_ext_dirs);
145 145 PropertyList_add(&_system_properties, _java_endorsed_dirs);
146 146 PropertyList_add(&_system_properties, _sun_boot_library_path);
147 147 PropertyList_add(&_system_properties, _java_library_path);
148 148 PropertyList_add(&_system_properties, _java_home);
149 149 PropertyList_add(&_system_properties, _java_class_path);
150 150 PropertyList_add(&_system_properties, _sun_boot_class_path);
151 151
152 152 // Set OS specific system properties values
153 153 os::init_system_properties_values();
154 154 }
155 155
156 156 /**
157 157 * Provide a slightly more user-friendly way of eliminating -XX flags.
158 158 * When a flag is eliminated, it can be added to this list in order to
159 159 * continue accepting this flag on the command-line, while issuing a warning
160 160 * and ignoring the value. Once the JDK version reaches the 'accept_until'
161 161 * limit, we flatly refuse to admit the existence of the flag. This allows
162 162 * a flag to die correctly over JDK releases using HSX.
163 163 */
164 164 typedef struct {
165 165 const char* name;
166 166 JDK_Version obsoleted_in; // when the flag went away
167 167 JDK_Version accept_until; // which version to start denying the existence
168 168 } ObsoleteFlag;
169 169
170 170 static ObsoleteFlag obsolete_jvm_flags[] = {
171 171 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 172 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 173 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 174 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 175 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 176 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 177 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 178 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 179 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 180 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 181 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 182 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 183 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
184 184 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
185 185 { NULL, JDK_Version(0), JDK_Version(0) }
186 186 };
187 187
188 188 // Returns true if the flag is obsolete and fits into the range specified
189 189 // for being ignored. In the case that the flag is ignored, the 'version'
190 190 // value is filled in with the version number when the flag became
191 191 // obsolete so that that value can be displayed to the user.
192 192 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
193 193 int i = 0;
194 194 assert(version != NULL, "Must provide a version buffer");
195 195 while (obsolete_jvm_flags[i].name != NULL) {
196 196 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
197 197 // <flag>=xxx form
198 198 // [-|+]<flag> form
199 199 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
200 200 ((s[0] == '+' || s[0] == '-') &&
201 201 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
202 202 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
203 203 *version = flag_status.obsoleted_in;
204 204 return true;
205 205 }
206 206 }
207 207 i++;
208 208 }
209 209 return false;
210 210 }
211 211
212 212 // Constructs the system class path (aka boot class path) from the following
213 213 // components, in order:
214 214 //
215 215 // prefix // from -Xbootclasspath/p:...
216 216 // endorsed // the expansion of -Djava.endorsed.dirs=...
217 217 // base // from os::get_system_properties() or -Xbootclasspath=
218 218 // suffix // from -Xbootclasspath/a:...
219 219 //
220 220 // java.endorsed.dirs is a list of directories; any jar or zip files in the
221 221 // directories are added to the sysclasspath just before the base.
222 222 //
223 223 // This could be AllStatic, but it isn't needed after argument processing is
224 224 // complete.
225 225 class SysClassPath: public StackObj {
226 226 public:
227 227 SysClassPath(const char* base);
228 228 ~SysClassPath();
229 229
230 230 inline void set_base(const char* base);
231 231 inline void add_prefix(const char* prefix);
232 232 inline void add_suffix_to_prefix(const char* suffix);
233 233 inline void add_suffix(const char* suffix);
234 234 inline void reset_path(const char* base);
235 235
236 236 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
237 237 // property. Must be called after all command-line arguments have been
238 238 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
239 239 // combined_path().
240 240 void expand_endorsed();
241 241
242 242 inline const char* get_base() const { return _items[_scp_base]; }
243 243 inline const char* get_prefix() const { return _items[_scp_prefix]; }
244 244 inline const char* get_suffix() const { return _items[_scp_suffix]; }
245 245 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
246 246
247 247 // Combine all the components into a single c-heap-allocated string; caller
248 248 // must free the string if/when no longer needed.
249 249 char* combined_path();
250 250
251 251 private:
252 252 // Utility routines.
253 253 static char* add_to_path(const char* path, const char* str, bool prepend);
254 254 static char* add_jars_to_path(char* path, const char* directory);
255 255
256 256 inline void reset_item_at(int index);
257 257
258 258 // Array indices for the items that make up the sysclasspath. All except the
259 259 // base are allocated in the C heap and freed by this class.
260 260 enum {
261 261 _scp_prefix, // from -Xbootclasspath/p:...
262 262 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
263 263 _scp_base, // the default sysclasspath
264 264 _scp_suffix, // from -Xbootclasspath/a:...
265 265 _scp_nitems // the number of items, must be last.
266 266 };
267 267
268 268 const char* _items[_scp_nitems];
269 269 DEBUG_ONLY(bool _expansion_done;)
270 270 };
271 271
272 272 SysClassPath::SysClassPath(const char* base) {
273 273 memset(_items, 0, sizeof(_items));
274 274 _items[_scp_base] = base;
275 275 DEBUG_ONLY(_expansion_done = false;)
276 276 }
277 277
278 278 SysClassPath::~SysClassPath() {
279 279 // Free everything except the base.
280 280 for (int i = 0; i < _scp_nitems; ++i) {
281 281 if (i != _scp_base) reset_item_at(i);
282 282 }
283 283 DEBUG_ONLY(_expansion_done = false;)
284 284 }
285 285
286 286 inline void SysClassPath::set_base(const char* base) {
287 287 _items[_scp_base] = base;
288 288 }
289 289
290 290 inline void SysClassPath::add_prefix(const char* prefix) {
291 291 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
292 292 }
293 293
294 294 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
295 295 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
296 296 }
297 297
298 298 inline void SysClassPath::add_suffix(const char* suffix) {
299 299 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
300 300 }
301 301
302 302 inline void SysClassPath::reset_item_at(int index) {
303 303 assert(index < _scp_nitems && index != _scp_base, "just checking");
304 304 if (_items[index] != NULL) {
305 305 FREE_C_HEAP_ARRAY(char, _items[index]);
306 306 _items[index] = NULL;
307 307 }
308 308 }
309 309
310 310 inline void SysClassPath::reset_path(const char* base) {
311 311 // Clear the prefix and suffix.
312 312 reset_item_at(_scp_prefix);
313 313 reset_item_at(_scp_suffix);
314 314 set_base(base);
315 315 }
316 316
317 317 //------------------------------------------------------------------------------
318 318
319 319 void SysClassPath::expand_endorsed() {
320 320 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
321 321
322 322 const char* path = Arguments::get_property("java.endorsed.dirs");
323 323 if (path == NULL) {
324 324 path = Arguments::get_endorsed_dir();
325 325 assert(path != NULL, "no default for java.endorsed.dirs");
326 326 }
327 327
328 328 char* expanded_path = NULL;
329 329 const char separator = *os::path_separator();
330 330 const char* const end = path + strlen(path);
331 331 while (path < end) {
332 332 const char* tmp_end = strchr(path, separator);
333 333 if (tmp_end == NULL) {
334 334 expanded_path = add_jars_to_path(expanded_path, path);
335 335 path = end;
336 336 } else {
337 337 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
338 338 memcpy(dirpath, path, tmp_end - path);
339 339 dirpath[tmp_end - path] = '\0';
340 340 expanded_path = add_jars_to_path(expanded_path, dirpath);
341 341 FREE_C_HEAP_ARRAY(char, dirpath);
342 342 path = tmp_end + 1;
343 343 }
344 344 }
345 345 _items[_scp_endorsed] = expanded_path;
346 346 DEBUG_ONLY(_expansion_done = true;)
347 347 }
348 348
349 349 // Combine the bootclasspath elements, some of which may be null, into a single
350 350 // c-heap-allocated string.
351 351 char* SysClassPath::combined_path() {
352 352 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
353 353 assert(_expansion_done, "must call expand_endorsed() first.");
354 354
355 355 size_t lengths[_scp_nitems];
356 356 size_t total_len = 0;
357 357
358 358 const char separator = *os::path_separator();
359 359
360 360 // Get the lengths.
361 361 int i;
362 362 for (i = 0; i < _scp_nitems; ++i) {
363 363 if (_items[i] != NULL) {
364 364 lengths[i] = strlen(_items[i]);
365 365 // Include space for the separator char (or a NULL for the last item).
366 366 total_len += lengths[i] + 1;
367 367 }
368 368 }
369 369 assert(total_len > 0, "empty sysclasspath not allowed");
370 370
371 371 // Copy the _items to a single string.
372 372 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
373 373 char* cp_tmp = cp;
374 374 for (i = 0; i < _scp_nitems; ++i) {
375 375 if (_items[i] != NULL) {
376 376 memcpy(cp_tmp, _items[i], lengths[i]);
377 377 cp_tmp += lengths[i];
378 378 *cp_tmp++ = separator;
379 379 }
380 380 }
381 381 *--cp_tmp = '\0'; // Replace the extra separator.
382 382 return cp;
383 383 }
384 384
385 385 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
386 386 char*
387 387 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
388 388 char *cp;
389 389
390 390 assert(str != NULL, "just checking");
391 391 if (path == NULL) {
392 392 size_t len = strlen(str) + 1;
393 393 cp = NEW_C_HEAP_ARRAY(char, len);
394 394 memcpy(cp, str, len); // copy the trailing null
395 395 } else {
396 396 const char separator = *os::path_separator();
397 397 size_t old_len = strlen(path);
398 398 size_t str_len = strlen(str);
399 399 size_t len = old_len + str_len + 2;
400 400
401 401 if (prepend) {
402 402 cp = NEW_C_HEAP_ARRAY(char, len);
403 403 char* cp_tmp = cp;
404 404 memcpy(cp_tmp, str, str_len);
405 405 cp_tmp += str_len;
406 406 *cp_tmp = separator;
407 407 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
408 408 FREE_C_HEAP_ARRAY(char, path);
409 409 } else {
410 410 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
411 411 char* cp_tmp = cp + old_len;
412 412 *cp_tmp = separator;
413 413 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
414 414 }
415 415 }
416 416 return cp;
417 417 }
418 418
419 419 // Scan the directory and append any jar or zip files found to path.
420 420 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
421 421 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
422 422 DIR* dir = os::opendir(directory);
423 423 if (dir == NULL) return path;
424 424
425 425 char dir_sep[2] = { '\0', '\0' };
426 426 size_t directory_len = strlen(directory);
427 427 const char fileSep = *os::file_separator();
428 428 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
429 429
430 430 /* Scan the directory for jars/zips, appending them to path. */
431 431 struct dirent *entry;
432 432 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
433 433 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
434 434 const char* name = entry->d_name;
435 435 const char* ext = name + strlen(name) - 4;
436 436 bool isJarOrZip = ext > name &&
437 437 (os::file_name_strcmp(ext, ".jar") == 0 ||
438 438 os::file_name_strcmp(ext, ".zip") == 0);
439 439 if (isJarOrZip) {
440 440 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
441 441 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
442 442 path = add_to_path(path, jarpath, false);
443 443 FREE_C_HEAP_ARRAY(char, jarpath);
444 444 }
445 445 }
446 446 FREE_C_HEAP_ARRAY(char, dbuf);
447 447 os::closedir(dir);
448 448 return path;
449 449 }
450 450
451 451 // Parses a memory size specification string.
452 452 static bool atomull(const char *s, julong* result) {
453 453 julong n = 0;
454 454 int args_read = sscanf(s, os::julong_format_specifier(), &n);
455 455 if (args_read != 1) {
456 456 return false;
457 457 }
458 458 while (*s != '\0' && isdigit(*s)) {
459 459 s++;
460 460 }
461 461 // 4705540: illegal if more characters are found after the first non-digit
462 462 if (strlen(s) > 1) {
463 463 return false;
464 464 }
465 465 switch (*s) {
466 466 case 'T': case 't':
467 467 *result = n * G * K;
468 468 // Check for overflow.
469 469 if (*result/((julong)G * K) != n) return false;
470 470 return true;
471 471 case 'G': case 'g':
472 472 *result = n * G;
473 473 if (*result/G != n) return false;
474 474 return true;
475 475 case 'M': case 'm':
476 476 *result = n * M;
477 477 if (*result/M != n) return false;
478 478 return true;
479 479 case 'K': case 'k':
480 480 *result = n * K;
481 481 if (*result/K != n) return false;
482 482 return true;
483 483 case '\0':
484 484 *result = n;
485 485 return true;
486 486 default:
487 487 return false;
488 488 }
489 489 }
490 490
491 491 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
492 492 if (size < min_size) return arg_too_small;
493 493 // Check that size will fit in a size_t (only relevant on 32-bit)
494 494 if (size > max_uintx) return arg_too_big;
495 495 return arg_in_range;
496 496 }
497 497
498 498 // Describe an argument out of range error
499 499 void Arguments::describe_range_error(ArgsRange errcode) {
500 500 switch(errcode) {
501 501 case arg_too_big:
502 502 jio_fprintf(defaultStream::error_stream(),
503 503 "The specified size exceeds the maximum "
504 504 "representable size.\n");
505 505 break;
506 506 case arg_too_small:
507 507 case arg_unreadable:
508 508 case arg_in_range:
509 509 // do nothing for now
510 510 break;
511 511 default:
512 512 ShouldNotReachHere();
513 513 }
514 514 }
515 515
516 516 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
517 517 return CommandLineFlags::boolAtPut(name, &value, origin);
518 518 }
519 519
520 520 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
521 521 double v;
522 522 if (sscanf(value, "%lf", &v) != 1) {
523 523 return false;
524 524 }
525 525
526 526 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
527 527 return true;
528 528 }
529 529 return false;
530 530 }
531 531
532 532 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
533 533 julong v;
534 534 intx intx_v;
535 535 bool is_neg = false;
536 536 // Check the sign first since atomull() parses only unsigned values.
537 537 if (*value == '-') {
538 538 if (!CommandLineFlags::intxAt(name, &intx_v)) {
539 539 return false;
540 540 }
541 541 value++;
542 542 is_neg = true;
543 543 }
544 544 if (!atomull(value, &v)) {
545 545 return false;
546 546 }
547 547 intx_v = (intx) v;
548 548 if (is_neg) {
549 549 intx_v = -intx_v;
550 550 }
551 551 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
552 552 return true;
553 553 }
554 554 uintx uintx_v = (uintx) v;
555 555 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
556 556 return true;
557 557 }
558 558 return false;
559 559 }
560 560
561 561 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
562 562 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
563 563 // Contract: CommandLineFlags always returns a pointer that needs freeing.
564 564 FREE_C_HEAP_ARRAY(char, value);
565 565 return true;
566 566 }
567 567
568 568 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
569 569 const char* old_value = "";
570 570 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
571 571 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
572 572 size_t new_len = strlen(new_value);
573 573 const char* value;
574 574 char* free_this_too = NULL;
575 575 if (old_len == 0) {
576 576 value = new_value;
577 577 } else if (new_len == 0) {
578 578 value = old_value;
579 579 } else {
580 580 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
581 581 // each new setting adds another LINE to the switch:
582 582 sprintf(buf, "%s\n%s", old_value, new_value);
583 583 value = buf;
584 584 free_this_too = buf;
585 585 }
586 586 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
587 587 // CommandLineFlags always returns a pointer that needs freeing.
588 588 FREE_C_HEAP_ARRAY(char, value);
589 589 if (free_this_too != NULL) {
590 590 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
591 591 FREE_C_HEAP_ARRAY(char, free_this_too);
592 592 }
593 593 return true;
594 594 }
595 595
596 596 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
597 597
598 598 // range of acceptable characters spelled out for portability reasons
599 599 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
600 600 #define BUFLEN 255
601 601 char name[BUFLEN+1];
602 602 char dummy;
603 603
604 604 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
605 605 return set_bool_flag(name, false, origin);
606 606 }
607 607 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
608 608 return set_bool_flag(name, true, origin);
609 609 }
610 610
611 611 char punct;
612 612 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
613 613 const char* value = strchr(arg, '=') + 1;
614 614 Flag* flag = Flag::find_flag(name, strlen(name));
615 615 if (flag != NULL && flag->is_ccstr()) {
616 616 if (flag->ccstr_accumulates()) {
617 617 return append_to_string_flag(name, value, origin);
618 618 } else {
619 619 if (value[0] == '\0') {
620 620 value = NULL;
621 621 }
622 622 return set_string_flag(name, value, origin);
623 623 }
624 624 }
625 625 }
626 626
627 627 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
628 628 const char* value = strchr(arg, '=') + 1;
629 629 // -XX:Foo:=xxx will reset the string flag to the given value.
630 630 if (value[0] == '\0') {
631 631 value = NULL;
632 632 }
633 633 return set_string_flag(name, value, origin);
634 634 }
635 635
636 636 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
637 637 #define SIGNED_NUMBER_RANGE "[-0123456789]"
638 638 #define NUMBER_RANGE "[0123456789]"
639 639 char value[BUFLEN + 1];
640 640 char value2[BUFLEN + 1];
641 641 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
642 642 // Looks like a floating-point number -- try again with more lenient format string
643 643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
644 644 return set_fp_numeric_flag(name, value, origin);
645 645 }
646 646 }
647 647
648 648 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
649 649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
650 650 return set_numeric_flag(name, value, origin);
651 651 }
652 652
653 653 return false;
654 654 }
655 655
656 656 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
657 657 assert(bldarray != NULL, "illegal argument");
658 658
659 659 if (arg == NULL) {
660 660 return;
661 661 }
662 662
663 663 int index = *count;
664 664
665 665 // expand the array and add arg to the last element
666 666 (*count)++;
667 667 if (*bldarray == NULL) {
668 668 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
669 669 } else {
670 670 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
671 671 }
672 672 (*bldarray)[index] = strdup(arg);
673 673 }
674 674
675 675 void Arguments::build_jvm_args(const char* arg) {
676 676 add_string(&_jvm_args_array, &_num_jvm_args, arg);
677 677 }
678 678
679 679 void Arguments::build_jvm_flags(const char* arg) {
680 680 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
681 681 }
682 682
683 683 // utility function to return a string that concatenates all
684 684 // strings in a given char** array
685 685 const char* Arguments::build_resource_string(char** args, int count) {
686 686 if (args == NULL || count == 0) {
687 687 return NULL;
688 688 }
689 689 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
690 690 for (int i = 1; i < count; i++) {
691 691 length += strlen(args[i]) + 1; // add 1 for a space
692 692 }
693 693 char* s = NEW_RESOURCE_ARRAY(char, length);
694 694 strcpy(s, args[0]);
695 695 for (int j = 1; j < count; j++) {
696 696 strcat(s, " ");
697 697 strcat(s, args[j]);
698 698 }
699 699 return (const char*) s;
700 700 }
701 701
702 702 void Arguments::print_on(outputStream* st) {
703 703 st->print_cr("VM Arguments:");
704 704 if (num_jvm_flags() > 0) {
705 705 st->print("jvm_flags: "); print_jvm_flags_on(st);
706 706 }
707 707 if (num_jvm_args() > 0) {
708 708 st->print("jvm_args: "); print_jvm_args_on(st);
709 709 }
710 710 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
711 711 st->print_cr("Launcher Type: %s", _sun_java_launcher);
712 712 }
713 713
714 714 void Arguments::print_jvm_flags_on(outputStream* st) {
715 715 if (_num_jvm_flags > 0) {
716 716 for (int i=0; i < _num_jvm_flags; i++) {
717 717 st->print("%s ", _jvm_flags_array[i]);
718 718 }
719 719 st->print_cr("");
720 720 }
721 721 }
722 722
723 723 void Arguments::print_jvm_args_on(outputStream* st) {
724 724 if (_num_jvm_args > 0) {
725 725 for (int i=0; i < _num_jvm_args; i++) {
726 726 st->print("%s ", _jvm_args_array[i]);
727 727 }
728 728 st->print_cr("");
729 729 }
730 730 }
731 731
732 732 bool Arguments::process_argument(const char* arg,
733 733 jboolean ignore_unrecognized, FlagValueOrigin origin) {
734 734
735 735 JDK_Version since = JDK_Version();
736 736
737 737 if (parse_argument(arg, origin)) {
738 738 // do nothing
739 739 } else if (is_newly_obsolete(arg, &since)) {
740 740 enum { bufsize = 256 };
741 741 char buffer[bufsize];
742 742 since.to_string(buffer, bufsize);
743 743 jio_fprintf(defaultStream::error_stream(),
744 744 "Warning: The flag %s has been EOL'd as of %s and will"
745 745 " be ignored\n", arg, buffer);
746 746 } else {
747 747 if (!ignore_unrecognized) {
748 748 jio_fprintf(defaultStream::error_stream(),
749 749 "Unrecognized VM option '%s'\n", arg);
750 750 // allow for commandline "commenting out" options like -XX:#+Verbose
751 751 if (strlen(arg) == 0 || arg[0] != '#') {
752 752 return false;
753 753 }
754 754 }
755 755 }
756 756 return true;
757 757 }
758 758
759 759 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
760 760 FILE* stream = fopen(file_name, "rb");
761 761 if (stream == NULL) {
762 762 if (should_exist) {
763 763 jio_fprintf(defaultStream::error_stream(),
764 764 "Could not open settings file %s\n", file_name);
765 765 return false;
766 766 } else {
767 767 return true;
768 768 }
769 769 }
770 770
771 771 char token[1024];
772 772 int pos = 0;
773 773
774 774 bool in_white_space = true;
775 775 bool in_comment = false;
776 776 bool in_quote = false;
777 777 char quote_c = 0;
778 778 bool result = true;
779 779
780 780 int c = getc(stream);
781 781 while(c != EOF) {
782 782 if (in_white_space) {
783 783 if (in_comment) {
784 784 if (c == '\n') in_comment = false;
785 785 } else {
786 786 if (c == '#') in_comment = true;
787 787 else if (!isspace(c)) {
788 788 in_white_space = false;
789 789 token[pos++] = c;
790 790 }
791 791 }
792 792 } else {
793 793 if (c == '\n' || (!in_quote && isspace(c))) {
794 794 // token ends at newline, or at unquoted whitespace
795 795 // this allows a way to include spaces in string-valued options
796 796 token[pos] = '\0';
797 797 logOption(token);
798 798 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
799 799 build_jvm_flags(token);
800 800 pos = 0;
801 801 in_white_space = true;
802 802 in_quote = false;
803 803 } else if (!in_quote && (c == '\'' || c == '"')) {
804 804 in_quote = true;
805 805 quote_c = c;
806 806 } else if (in_quote && (c == quote_c)) {
807 807 in_quote = false;
808 808 } else {
809 809 token[pos++] = c;
810 810 }
811 811 }
812 812 c = getc(stream);
813 813 }
814 814 if (pos > 0) {
815 815 token[pos] = '\0';
816 816 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
817 817 build_jvm_flags(token);
818 818 }
819 819 fclose(stream);
820 820 return result;
821 821 }
822 822
823 823 //=============================================================================================================
824 824 // Parsing of properties (-D)
825 825
826 826 const char* Arguments::get_property(const char* key) {
827 827 return PropertyList_get_value(system_properties(), key);
828 828 }
829 829
830 830 bool Arguments::add_property(const char* prop) {
831 831 const char* eq = strchr(prop, '=');
832 832 char* key;
833 833 // ns must be static--its address may be stored in a SystemProperty object.
834 834 const static char ns[1] = {0};
835 835 char* value = (char *)ns;
836 836
837 837 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
838 838 key = AllocateHeap(key_len + 1, "add_property");
839 839 strncpy(key, prop, key_len);
840 840 key[key_len] = '\0';
841 841
842 842 if (eq != NULL) {
843 843 size_t value_len = strlen(prop) - key_len - 1;
844 844 value = AllocateHeap(value_len + 1, "add_property");
845 845 strncpy(value, &prop[key_len + 1], value_len + 1);
846 846 }
847 847
848 848 if (strcmp(key, "java.compiler") == 0) {
849 849 process_java_compiler_argument(value);
850 850 FreeHeap(key);
851 851 if (eq != NULL) {
852 852 FreeHeap(value);
853 853 }
854 854 return true;
855 855 } else if (strcmp(key, "sun.java.command") == 0) {
856 856 _java_command = value;
857 857
858 858 // don't add this property to the properties exposed to the java application
859 859 FreeHeap(key);
860 860 return true;
861 861 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
862 862 // launcher.pid property is private and is processed
863 863 // in process_sun_java_launcher_properties();
864 864 // the sun.java.launcher property is passed on to the java application
865 865 FreeHeap(key);
866 866 if (eq != NULL) {
867 867 FreeHeap(value);
868 868 }
869 869 return true;
870 870 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
871 871 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
872 872 // its value without going through the property list or making a Java call.
873 873 _java_vendor_url_bug = value;
874 874 } else if (strcmp(key, "sun.boot.library.path") == 0) {
875 875 PropertyList_unique_add(&_system_properties, key, value, true);
876 876 return true;
877 877 }
878 878 // Create new property and add at the end of the list
879 879 PropertyList_unique_add(&_system_properties, key, value);
880 880 return true;
881 881 }
882 882
883 883 //===========================================================================================================
884 884 // Setting int/mixed/comp mode flags
885 885
886 886 void Arguments::set_mode_flags(Mode mode) {
887 887 // Set up default values for all flags.
888 888 // If you add a flag to any of the branches below,
889 889 // add a default value for it here.
890 890 set_java_compiler(false);
891 891 _mode = mode;
892 892
893 893 // Ensure Agent_OnLoad has the correct initial values.
894 894 // This may not be the final mode; mode may change later in onload phase.
895 895 PropertyList_unique_add(&_system_properties, "java.vm.info",
896 896 (char*)Abstract_VM_Version::vm_info_string(), false);
897 897
898 898 UseInterpreter = true;
899 899 UseCompiler = true;
900 900 UseLoopCounter = true;
901 901
902 902 // Default values may be platform/compiler dependent -
903 903 // use the saved values
904 904 ClipInlining = Arguments::_ClipInlining;
905 905 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
906 906 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
907 907 BackgroundCompilation = Arguments::_BackgroundCompilation;
908 908 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
909 909
910 910 // Change from defaults based on mode
911 911 switch (mode) {
912 912 default:
913 913 ShouldNotReachHere();
914 914 break;
915 915 case _int:
916 916 UseCompiler = false;
917 917 UseLoopCounter = false;
918 918 AlwaysCompileLoopMethods = false;
919 919 UseOnStackReplacement = false;
920 920 break;
921 921 case _mixed:
922 922 // same as default
923 923 break;
924 924 case _comp:
925 925 UseInterpreter = false;
926 926 BackgroundCompilation = false;
927 927 ClipInlining = false;
928 928 break;
929 929 }
930 930 }
931 931
932 932 // Conflict: required to use shared spaces (-Xshare:on), but
933 933 // incompatible command line options were chosen.
934 934
935 935 static void no_shared_spaces() {
936 936 if (RequireSharedSpaces) {
937 937 jio_fprintf(defaultStream::error_stream(),
938 938 "Class data sharing is inconsistent with other specified options.\n");
939 939 vm_exit_during_initialization("Unable to use shared archive.", NULL);
940 940 } else {
941 941 FLAG_SET_DEFAULT(UseSharedSpaces, false);
942 942 }
943 943 }
944 944
945 945 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
946 946 // if it's not explictly set or unset. If the user has chosen
947 947 // UseParNewGC and not explicitly set ParallelGCThreads we
948 948 // set it, unless this is a single cpu machine.
949 949 void Arguments::set_parnew_gc_flags() {
950 950 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
951 951 "control point invariant");
952 952 assert(UseParNewGC, "Error");
953 953
954 954 // Turn off AdaptiveSizePolicy by default for parnew until it is
955 955 // complete.
956 956 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
957 957 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
958 958 }
959 959
960 960 if (ParallelGCThreads == 0) {
961 961 FLAG_SET_DEFAULT(ParallelGCThreads,
962 962 Abstract_VM_Version::parallel_worker_threads());
963 963 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
964 964 FLAG_SET_DEFAULT(UseParNewGC, false);
965 965 }
966 966 }
967 967 if (!UseParNewGC) {
968 968 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
969 969 } else {
970 970 no_shared_spaces();
971 971
972 972 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
973 973 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
974 974 // we set them to 1024 and 1024.
975 975 // See CR 6362902.
976 976 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
977 977 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
978 978 }
979 979 if (FLAG_IS_DEFAULT(OldPLABSize)) {
980 980 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
981 981 }
982 982
983 983 // AlwaysTenure flag should make ParNew to promote all at first collection.
984 984 // See CR 6362902.
985 985 if (AlwaysTenure) {
986 986 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
987 987 }
988 988 // When using compressed oops, we use local overflow stacks,
989 989 // rather than using a global overflow list chained through
990 990 // the klass word of the object's pre-image.
991 991 if (UseCompressedOops && !ParGCUseLocalOverflow) {
992 992 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
993 993 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
994 994 }
995 995 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
996 996 }
997 997 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
998 998 }
999 999 }
1000 1000
1001 1001 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1002 1002 // sparc/solaris for certain applications, but would gain from
1003 1003 // further optimization and tuning efforts, and would almost
1004 1004 // certainly gain from analysis of platform and environment.
1005 1005 void Arguments::set_cms_and_parnew_gc_flags() {
1006 1006 assert(!UseSerialGC && !UseParallelGC, "Error");
1007 1007 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1008 1008
1009 1009 // If we are using CMS, we prefer to UseParNewGC,
1010 1010 // unless explicitly forbidden.
1011 1011 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1012 1012 FLAG_SET_ERGO(bool, UseParNewGC, true);
1013 1013 }
1014 1014
1015 1015 // Turn off AdaptiveSizePolicy by default for cms until it is
1016 1016 // complete.
1017 1017 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1018 1018 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1019 1019 }
1020 1020
1021 1021 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1022 1022 // as needed.
1023 1023 if (UseParNewGC) {
1024 1024 set_parnew_gc_flags();
1025 1025 }
1026 1026
1027 1027 // Now make adjustments for CMS
1028 1028 size_t young_gen_per_worker;
1029 1029 intx new_ratio;
1030 1030 size_t min_new_default;
1031 1031 intx tenuring_default;
1032 1032 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1033 1033 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1034 1034 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1035 1035 }
1036 1036 young_gen_per_worker = 4*M;
1037 1037 new_ratio = (intx)15;
1038 1038 min_new_default = 4*M;
1039 1039 tenuring_default = (intx)0;
1040 1040 } else { // new defaults: "new" as of 6.0
1041 1041 young_gen_per_worker = CMSYoungGenPerWorker;
1042 1042 new_ratio = (intx)7;
1043 1043 min_new_default = 16*M;
1044 1044 tenuring_default = (intx)4;
1045 1045 }
1046 1046
1047 1047 // Preferred young gen size for "short" pauses
1048 1048 const uintx parallel_gc_threads =
1049 1049 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1050 1050 const size_t preferred_max_new_size_unaligned =
1051 1051 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1052 1052 const size_t preferred_max_new_size =
1053 1053 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1054 1054
1055 1055 // Unless explicitly requested otherwise, size young gen
1056 1056 // for "short" pauses ~ 4M*ParallelGCThreads
1057 1057
1058 1058 // If either MaxNewSize or NewRatio is set on the command line,
1059 1059 // assume the user is trying to set the size of the young gen.
1060 1060
1061 1061 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1062 1062
1063 1063 // Set MaxNewSize to our calculated preferred_max_new_size unless
1064 1064 // NewSize was set on the command line and it is larger than
1065 1065 // preferred_max_new_size.
1066 1066 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1067 1067 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1068 1068 } else {
1069 1069 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1070 1070 }
1071 1071 if(PrintGCDetails && Verbose) {
1072 1072 // Too early to use gclog_or_tty
1073 1073 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1074 1074 }
1075 1075
1076 1076 // Unless explicitly requested otherwise, prefer a large
1077 1077 // Old to Young gen size so as to shift the collection load
1078 1078 // to the old generation concurrent collector
1079 1079
1080 1080 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1081 1081 // then NewSize and OldSize may be calculated. That would
1082 1082 // generally lead to some differences with ParNewGC for which
1083 1083 // there was no obvious reason. Also limit to the case where
1084 1084 // MaxNewSize has not been set.
1085 1085
1086 1086 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1087 1087
1088 1088 // Code along this path potentially sets NewSize and OldSize
1089 1089
1090 1090 // Calculate the desired minimum size of the young gen but if
1091 1091 // NewSize has been set on the command line, use it here since
1092 1092 // it should be the final value.
1093 1093 size_t min_new;
1094 1094 if (FLAG_IS_DEFAULT(NewSize)) {
1095 1095 min_new = align_size_up(ScaleForWordSize(min_new_default),
1096 1096 os::vm_page_size());
1097 1097 } else {
1098 1098 min_new = NewSize;
1099 1099 }
1100 1100 size_t prev_initial_size = initial_heap_size();
1101 1101 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1102 1102 set_initial_heap_size(min_new+OldSize);
1103 1103 // Currently minimum size and the initial heap sizes are the same.
1104 1104 set_min_heap_size(initial_heap_size());
1105 1105 if (PrintGCDetails && Verbose) {
1106 1106 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1107 1107 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1108 1108 initial_heap_size()/M, prev_initial_size/M);
1109 1109 }
1110 1110 }
1111 1111
1112 1112 // MaxHeapSize is aligned down in collectorPolicy
1113 1113 size_t max_heap =
1114 1114 align_size_down(MaxHeapSize,
1115 1115 CardTableRS::ct_max_alignment_constraint());
1116 1116
1117 1117 if(PrintGCDetails && Verbose) {
1118 1118 // Too early to use gclog_or_tty
1119 1119 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1120 1120 " initial_heap_size: " SIZE_FORMAT
1121 1121 " max_heap: " SIZE_FORMAT,
1122 1122 min_heap_size(), initial_heap_size(), max_heap);
1123 1123 }
1124 1124 if (max_heap > min_new) {
1125 1125 // Unless explicitly requested otherwise, make young gen
1126 1126 // at least min_new, and at most preferred_max_new_size.
1127 1127 if (FLAG_IS_DEFAULT(NewSize)) {
1128 1128 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1129 1129 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1130 1130 if(PrintGCDetails && Verbose) {
1131 1131 // Too early to use gclog_or_tty
1132 1132 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1133 1133 }
1134 1134 }
1135 1135 // Unless explicitly requested otherwise, size old gen
1136 1136 // so that it's at least 3X of NewSize to begin with;
1137 1137 // later NewRatio will decide how it grows; see above.
1138 1138 if (FLAG_IS_DEFAULT(OldSize)) {
1139 1139 if (max_heap > NewSize) {
1140 1140 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1141 1141 if(PrintGCDetails && Verbose) {
1142 1142 // Too early to use gclog_or_tty
1143 1143 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1144 1144 }
1145 1145 }
1146 1146 }
1147 1147 }
1148 1148 }
1149 1149 // Unless explicitly requested otherwise, definitely
1150 1150 // promote all objects surviving "tenuring_default" scavenges.
1151 1151 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1152 1152 FLAG_IS_DEFAULT(SurvivorRatio)) {
1153 1153 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1154 1154 }
1155 1155 // If we decided above (or user explicitly requested)
1156 1156 // `promote all' (via MaxTenuringThreshold := 0),
1157 1157 // prefer minuscule survivor spaces so as not to waste
1158 1158 // space for (non-existent) survivors
1159 1159 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1160 1160 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1161 1161 }
1162 1162 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1163 1163 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1164 1164 // This is done in order to make ParNew+CMS configuration to work
1165 1165 // with YoungPLABSize and OldPLABSize options.
1166 1166 // See CR 6362902.
1167 1167 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1168 1168 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1169 1169 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1170 1170 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1171 1171 // the value (either from the command line or ergonomics) of
1172 1172 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1173 1173 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1174 1174 }
1175 1175 else {
1176 1176 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1177 1177 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1178 1178 // we'll let it to take precedence.
1179 1179 jio_fprintf(defaultStream::error_stream(),
1180 1180 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1181 1181 " options are specified for the CMS collector."
1182 1182 " CMSParPromoteBlocksToClaim will take precedence.\n");
1183 1183 }
1184 1184 }
1185 1185 }
1186 1186
1187 1187 inline uintx max_heap_for_compressed_oops() {
1188 1188 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1189 1189 NOT_LP64(return DefaultMaxRAM);
1190 1190 }
1191 1191
1192 1192 bool Arguments::should_auto_select_low_pause_collector() {
1193 1193 if (UseAutoGCSelectPolicy &&
1194 1194 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1195 1195 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1196 1196 if (PrintGCDetails) {
1197 1197 // Cannot use gclog_or_tty yet.
1198 1198 tty->print_cr("Automatic selection of the low pause collector"
1199 1199 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1200 1200 }
1201 1201 return true;
1202 1202 }
1203 1203 return false;
1204 1204 }
1205 1205
1206 1206 void Arguments::set_ergonomics_flags() {
1207 1207 // Parallel GC is not compatible with sharing. If one specifies
1208 1208 // that they want sharing explicitly, do not set ergonmics flags.
1209 1209 if (DumpSharedSpaces || ForceSharedSpaces) {
1210 1210 return;
1211 1211 }
1212 1212
1213 1213 if (os::is_server_class_machine() && !force_client_mode ) {
1214 1214 // If no other collector is requested explicitly,
1215 1215 // let the VM select the collector based on
1216 1216 // machine class and automatic selection policy.
1217 1217 if (!UseSerialGC &&
1218 1218 !UseConcMarkSweepGC &&
1219 1219 !UseG1GC &&
1220 1220 !UseParNewGC &&
1221 1221 !DumpSharedSpaces &&
1222 1222 FLAG_IS_DEFAULT(UseParallelGC)) {
1223 1223 if (should_auto_select_low_pause_collector()) {
1224 1224 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1225 1225 } else {
1226 1226 FLAG_SET_ERGO(bool, UseParallelGC, true);
1227 1227 }
1228 1228 no_shared_spaces();
1229 1229 }
1230 1230 }
1231 1231
1232 1232 #ifndef ZERO
1233 1233 #ifdef _LP64
1234 1234 // Check that UseCompressedOops can be set with the max heap size allocated
1235 1235 // by ergonomics.
1236 1236 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1237 1237 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1238 1238 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1239 1239 }
1240 1240 #ifdef _WIN64
1241 1241 if (UseLargePages && UseCompressedOops) {
1242 1242 // Cannot allocate guard pages for implicit checks in indexed addressing
1243 1243 // mode, when large pages are specified on windows.
1244 1244 // This flag could be switched ON if narrow oop base address is set to 0,
1245 1245 // see code in Universe::initialize_heap().
1246 1246 Universe::set_narrow_oop_use_implicit_null_checks(false);
1247 1247 }
1248 1248 #endif // _WIN64
1249 1249 } else {
1250 1250 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1251 1251 warning("Max heap size too large for Compressed Oops");
1252 1252 FLAG_SET_DEFAULT(UseCompressedOops, false);
1253 1253 }
1254 1254 }
1255 1255 // Also checks that certain machines are slower with compressed oops
1256 1256 // in vm_version initialization code.
1257 1257 #endif // _LP64
1258 1258 #endif // !ZERO
1259 1259 }
1260 1260
1261 1261 void Arguments::set_parallel_gc_flags() {
1262 1262 assert(UseParallelGC || UseParallelOldGC, "Error");
1263 1263 // If parallel old was requested, automatically enable parallel scavenge.
1264 1264 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1265 1265 FLAG_SET_DEFAULT(UseParallelGC, true);
1266 1266 }
1267 1267
1268 1268 // If no heap maximum was requested explicitly, use some reasonable fraction
1269 1269 // of the physical memory, up to a maximum of 1GB.
1270 1270 if (UseParallelGC) {
1271 1271 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1272 1272 Abstract_VM_Version::parallel_worker_threads());
1273 1273
1274 1274 // PS is a server collector, setup the heap sizes accordingly.
1275 1275 set_server_heap_size();
1276 1276 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1277 1277 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1278 1278 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1279 1279 // See CR 6362902 for details.
1280 1280 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1281 1281 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1282 1282 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1283 1283 }
1284 1284 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1285 1285 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1286 1286 }
1287 1287 }
1288 1288
1289 1289 if (UseParallelOldGC) {
1290 1290 // Par compact uses lower default values since they are treated as
1291 1291 // minimums. These are different defaults because of the different
1292 1292 // interpretation and are not ergonomically set.
1293 1293 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1294 1294 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1295 1295 }
1296 1296 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1297 1297 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1298 1298 }
1299 1299 }
1300 1300 }
1301 1301 }
1302 1302
1303 1303 void Arguments::set_g1_gc_flags() {
1304 1304 assert(UseG1GC, "Error");
1305 1305 // G1 is a server collector, setup the heap sizes accordingly.
1306 1306 set_server_heap_size();
1307 1307 #ifdef COMPILER1
1308 1308 FastTLABRefill = false;
1309 1309 #endif
1310 1310 FLAG_SET_DEFAULT(ParallelGCThreads,
1311 1311 Abstract_VM_Version::parallel_worker_threads());
1312 1312 if (ParallelGCThreads == 0) {
1313 1313 FLAG_SET_DEFAULT(ParallelGCThreads,
1314 1314 Abstract_VM_Version::parallel_worker_threads());
1315 1315 }
1316 1316 no_shared_spaces();
1317 1317
1318 1318 // Set the maximum pause time goal to be a reasonable default.
1319 1319 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1320 1320 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1321 1321 }
1322 1322 }
1323 1323
1324 1324 void Arguments::set_server_heap_size() {
1325 1325 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1326 1326 const uint64_t reasonable_fraction =
1327 1327 os::physical_memory() / DefaultMaxRAMFraction;
1328 1328 const uint64_t maximum_size = (uint64_t)
1329 1329 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1330 1330 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1331 1331 DefaultMaxRAM);
1332 1332 size_t reasonable_max =
1333 1333 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1334 1334 if (reasonable_max > maximum_size) {
1335 1335 reasonable_max = maximum_size;
1336 1336 }
1337 1337 if (PrintGCDetails && Verbose) {
1338 1338 // Cannot use gclog_or_tty yet.
1339 1339 tty->print_cr(" Max heap size for server class platform "
1340 1340 SIZE_FORMAT, reasonable_max);
1341 1341 }
1342 1342 // If the initial_heap_size has not been set with -Xms,
1343 1343 // then set it as fraction of size of physical memory
1344 1344 // respecting the maximum and minimum sizes of the heap.
1345 1345 if (initial_heap_size() == 0) {
1346 1346 const uint64_t reasonable_initial_fraction =
1347 1347 os::physical_memory() / DefaultInitialRAMFraction;
1348 1348 const size_t reasonable_initial =
1349 1349 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1350 1350 const size_t minimum_size = NewSize + OldSize;
1351 1351 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1352 1352 minimum_size));
1353 1353 // Currently the minimum size and the initial heap sizes are the same.
1354 1354 set_min_heap_size(initial_heap_size());
1355 1355 if (PrintGCDetails && Verbose) {
1356 1356 // Cannot use gclog_or_tty yet.
1357 1357 tty->print_cr(" Initial heap size for server class platform "
1358 1358 SIZE_FORMAT, initial_heap_size());
1359 1359 }
1360 1360 } else {
1361 1361 // A minimum size was specified on the command line. Be sure
1362 1362 // that the maximum size is consistent.
1363 1363 if (initial_heap_size() > reasonable_max) {
1364 1364 reasonable_max = initial_heap_size();
1365 1365 }
1366 1366 }
1367 1367 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1368 1368 }
1369 1369 }
1370 1370
1371 1371 // This must be called after ergonomics because we want bytecode rewriting
1372 1372 // if the server compiler is used, or if UseSharedSpaces is disabled.
1373 1373 void Arguments::set_bytecode_flags() {
1374 1374 // Better not attempt to store into a read-only space.
1375 1375 if (UseSharedSpaces) {
1376 1376 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1377 1377 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1378 1378 }
1379 1379
1380 1380 if (!RewriteBytecodes) {
1381 1381 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1382 1382 }
1383 1383 }
1384 1384
1385 1385 // Aggressive optimization flags -XX:+AggressiveOpts
1386 1386 void Arguments::set_aggressive_opts_flags() {
1387 1387 #ifdef COMPILER2
1388 1388 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1389 1389 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1390 1390 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1391 1391 }
1392 1392 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1393 1393 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1394 1394 }
1395 1395
1396 1396 // Feed the cache size setting into the JDK
1397 1397 char buffer[1024];
1398 1398 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1399 1399 add_property(buffer);
1400 1400 }
1401 1401 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1402 1402 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1403 1403 }
1404 1404 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1405 1405 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1406 1406 }
1407 1407 #endif
1408 1408
1409 1409 if (AggressiveOpts) {
1410 1410 // Sample flag setting code
1411 1411 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1412 1412 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1413 1413 // }
1414 1414 }
1415 1415 }
1416 1416
1417 1417 //===========================================================================================================
1418 1418 // Parsing of java.compiler property
1419 1419
1420 1420 void Arguments::process_java_compiler_argument(char* arg) {
1421 1421 // For backwards compatibility, Djava.compiler=NONE or ""
1422 1422 // causes us to switch to -Xint mode UNLESS -Xdebug
1423 1423 // is also specified.
1424 1424 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1425 1425 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1426 1426 }
1427 1427 }
1428 1428
1429 1429 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1430 1430 _sun_java_launcher = strdup(launcher);
1431 1431 }
1432 1432
1433 1433 bool Arguments::created_by_java_launcher() {
1434 1434 assert(_sun_java_launcher != NULL, "property must have value");
1435 1435 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1436 1436 }
1437 1437
1438 1438 //===========================================================================================================
1439 1439 // Parsing of main arguments
1440 1440
1441 1441 bool Arguments::verify_percentage(uintx value, const char* name) {
1442 1442 if (value <= 100) {
1443 1443 return true;
1444 1444 }
1445 1445 jio_fprintf(defaultStream::error_stream(),
1446 1446 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1447 1447 name, value);
1448 1448 return false;
1449 1449 }
1450 1450
1451 1451 static void set_serial_gc_flags() {
1452 1452 FLAG_SET_DEFAULT(UseSerialGC, true);
1453 1453 FLAG_SET_DEFAULT(UseParNewGC, false);
1454 1454 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1455 1455 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1456 1456 FLAG_SET_DEFAULT(UseParallelGC, false);
1457 1457 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1458 1458 FLAG_SET_DEFAULT(UseG1GC, false);
1459 1459 }
1460 1460
1461 1461 static bool verify_serial_gc_flags() {
1462 1462 return (UseSerialGC &&
1463 1463 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1464 1464 UseParallelGC || UseParallelOldGC));
1465 1465 }
1466 1466
1467 1467 // Check consistency of GC selection
1468 1468 bool Arguments::check_gc_consistency() {
1469 1469 bool status = true;
1470 1470 // Ensure that the user has not selected conflicting sets
1471 1471 // of collectors. [Note: this check is merely a user convenience;
1472 1472 // collectors over-ride each other so that only a non-conflicting
1473 1473 // set is selected; however what the user gets is not what they
1474 1474 // may have expected from the combination they asked for. It's
1475 1475 // better to reduce user confusion by not allowing them to
1476 1476 // select conflicting combinations.
1477 1477 uint i = 0;
1478 1478 if (UseSerialGC) i++;
1479 1479 if (UseConcMarkSweepGC || UseParNewGC) i++;
1480 1480 if (UseParallelGC || UseParallelOldGC) i++;
1481 1481 if (UseG1GC) i++;
1482 1482 if (i > 1) {
1483 1483 jio_fprintf(defaultStream::error_stream(),
1484 1484 "Conflicting collector combinations in option list; "
1485 1485 "please refer to the release notes for the combinations "
1486 1486 "allowed\n");
1487 1487 status = false;
1488 1488 }
1489 1489
1490 1490 return status;
1491 1491 }
1492 1492
1493 1493 // Check the consistency of vm_init_args
1494 1494 bool Arguments::check_vm_args_consistency() {
1495 1495 // Method for adding checks for flag consistency.
1496 1496 // The intent is to warn the user of all possible conflicts,
1497 1497 // before returning an error.
1498 1498 // Note: Needs platform-dependent factoring.
1499 1499 bool status = true;
1500 1500
1501 1501 #if ( (defined(COMPILER2) && defined(SPARC)))
1502 1502 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1503 1503 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1504 1504 // x86. Normally, VM_Version_init must be called from init_globals in
1505 1505 // init.cpp, which is called by the initial java thread *after* arguments
1506 1506 // have been parsed. VM_Version_init gets called twice on sparc.
1507 1507 extern void VM_Version_init();
1508 1508 VM_Version_init();
1509 1509 if (!VM_Version::has_v9()) {
1510 1510 jio_fprintf(defaultStream::error_stream(),
1511 1511 "V8 Machine detected, Server requires V9\n");
1512 1512 status = false;
1513 1513 }
1514 1514 #endif /* COMPILER2 && SPARC */
1515 1515
1516 1516 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1517 1517 // builds so the cost of stack banging can be measured.
1518 1518 #if (defined(PRODUCT) && defined(SOLARIS))
1519 1519 if (!UseBoundThreads && !UseStackBanging) {
1520 1520 jio_fprintf(defaultStream::error_stream(),
1521 1521 "-UseStackBanging conflicts with -UseBoundThreads\n");
1522 1522
1523 1523 status = false;
1524 1524 }
1525 1525 #endif
1526 1526
1527 1527 if (TLABRefillWasteFraction == 0) {
1528 1528 jio_fprintf(defaultStream::error_stream(),
1529 1529 "TLABRefillWasteFraction should be a denominator, "
1530 1530 "not " SIZE_FORMAT "\n",
1531 1531 TLABRefillWasteFraction);
1532 1532 status = false;
1533 1533 }
1534 1534
1535 1535 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1536 1536 "MaxLiveObjectEvacuationRatio");
1537 1537 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1538 1538 "AdaptiveSizePolicyWeight");
1539 1539 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1540 1540 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1541 1541 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1542 1542 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1543 1543
1544 1544 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1545 1545 jio_fprintf(defaultStream::error_stream(),
1546 1546 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1547 1547 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1548 1548 MinHeapFreeRatio, MaxHeapFreeRatio);
1549 1549 status = false;
1550 1550 }
1551 1551 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1552 1552 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1553 1553
1554 1554 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1555 1555 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1556 1556 }
1557 1557
1558 1558 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1559 1559 // Settings to encourage splitting.
1560 1560 if (!FLAG_IS_CMDLINE(NewRatio)) {
1561 1561 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1562 1562 }
1563 1563 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1564 1564 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1565 1565 }
1566 1566 }
1567 1567
1568 1568 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1569 1569 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1570 1570 if (GCTimeLimit == 100) {
1571 1571 // Turn off gc-overhead-limit-exceeded checks
1572 1572 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1573 1573 }
1574 1574
1575 1575 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1576 1576
1577 1577 // Check user specified sharing option conflict with Parallel GC
1578 1578 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC ||
1579 1579 UseParallelGC || UseParallelOldGC ||
1580 1580 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1581 1581
1582 1582 if (cannot_share) {
1583 1583 // Either force sharing on by forcing the other options off, or
1584 1584 // force sharing off.
1585 1585 if (DumpSharedSpaces || ForceSharedSpaces) {
1586 1586 jio_fprintf(defaultStream::error_stream(),
1587 1587 "Reverting to Serial GC because of %s \n",
1588 1588 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump");
1589 1589 set_serial_gc_flags();
1590 1590 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1591 1591 } else {
1592 1592 if (UseSharedSpaces) {
1593 1593 jio_fprintf(defaultStream::error_stream(),
1594 1594 "Turning off use of shared archive because of "
1595 1595 "choice of garbage collector or large pages \n");
1596 1596 }
1597 1597 no_shared_spaces();
1598 1598 }
1599 1599 }
1600 1600
1601 1601 status = status && check_gc_consistency();
1602 1602
1603 1603 if (_has_alloc_profile) {
1604 1604 if (UseParallelGC || UseParallelOldGC) {
1605 1605 jio_fprintf(defaultStream::error_stream(),
1606 1606 "error: invalid argument combination.\n"
1607 1607 "Allocation profiling (-Xaprof) cannot be used together with "
1608 1608 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1609 1609 status = false;
1610 1610 }
1611 1611 if (UseConcMarkSweepGC) {
1612 1612 jio_fprintf(defaultStream::error_stream(),
1613 1613 "error: invalid argument combination.\n"
1614 1614 "Allocation profiling (-Xaprof) cannot be used together with "
1615 1615 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1616 1616 status = false;
1617 1617 }
1618 1618 }
1619 1619
1620 1620 if (CMSIncrementalMode) {
1621 1621 if (!UseConcMarkSweepGC) {
1622 1622 jio_fprintf(defaultStream::error_stream(),
1623 1623 "error: invalid argument combination.\n"
1624 1624 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1625 1625 "selected in order\nto use CMSIncrementalMode.\n");
1626 1626 status = false;
1627 1627 } else {
1628 1628 status = status && verify_percentage(CMSIncrementalDutyCycle,
1629 1629 "CMSIncrementalDutyCycle");
1630 1630 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1631 1631 "CMSIncrementalDutyCycleMin");
1632 1632 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1633 1633 "CMSIncrementalSafetyFactor");
1634 1634 status = status && verify_percentage(CMSIncrementalOffset,
1635 1635 "CMSIncrementalOffset");
1636 1636 status = status && verify_percentage(CMSExpAvgFactor,
1637 1637 "CMSExpAvgFactor");
1638 1638 // If it was not set on the command line, set
1639 1639 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1640 1640 if (CMSInitiatingOccupancyFraction < 0) {
1641 1641 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1642 1642 }
1643 1643 }
1644 1644 }
1645 1645
1646 1646 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1647 1647 // insists that we hold the requisite locks so that the iteration is
1648 1648 // MT-safe. For the verification at start-up and shut-down, we don't
1649 1649 // yet have a good way of acquiring and releasing these locks,
1650 1650 // which are not visible at the CollectedHeap level. We want to
1651 1651 // be able to acquire these locks and then do the iteration rather
1652 1652 // than just disable the lock verification. This will be fixed under
1653 1653 // bug 4788986.
1654 1654 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1655 1655 if (VerifyGCStartAt == 0) {
1656 1656 warning("Heap verification at start-up disabled "
1657 1657 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1658 1658 VerifyGCStartAt = 1; // Disable verification at start-up
1659 1659 }
1660 1660 if (VerifyBeforeExit) {
1661 1661 warning("Heap verification at shutdown disabled "
1662 1662 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1663 1663 VerifyBeforeExit = false; // Disable verification at shutdown
1664 1664 }
1665 1665 }
1666 1666
1667 1667 // Note: only executed in non-PRODUCT mode
1668 1668 if (!UseAsyncConcMarkSweepGC &&
1669 1669 (ExplicitGCInvokesConcurrent ||
1670 1670 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1671 1671 jio_fprintf(defaultStream::error_stream(),
1672 1672 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1673 1673 " with -UseAsyncConcMarkSweepGC");
1674 1674 status = false;
1675 1675 }
1676 1676
1677 1677 return status;
1678 1678 }
1679 1679
1680 1680 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1681 1681 const char* option_type) {
1682 1682 if (ignore) return false;
1683 1683
1684 1684 const char* spacer = " ";
1685 1685 if (option_type == NULL) {
1686 1686 option_type = ++spacer; // Set both to the empty string.
1687 1687 }
1688 1688
1689 1689 if (os::obsolete_option(option)) {
1690 1690 jio_fprintf(defaultStream::error_stream(),
1691 1691 "Obsolete %s%soption: %s\n", option_type, spacer,
1692 1692 option->optionString);
1693 1693 return false;
1694 1694 } else {
1695 1695 jio_fprintf(defaultStream::error_stream(),
1696 1696 "Unrecognized %s%soption: %s\n", option_type, spacer,
1697 1697 option->optionString);
1698 1698 return true;
1699 1699 }
1700 1700 }
1701 1701
1702 1702 static const char* user_assertion_options[] = {
1703 1703 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1704 1704 };
1705 1705
1706 1706 static const char* system_assertion_options[] = {
1707 1707 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1708 1708 };
1709 1709
1710 1710 // Return true if any of the strings in null-terminated array 'names' matches.
1711 1711 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1712 1712 // the option must match exactly.
1713 1713 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1714 1714 bool tail_allowed) {
1715 1715 for (/* empty */; *names != NULL; ++names) {
1716 1716 if (match_option(option, *names, tail)) {
1717 1717 if (**tail == '\0' || tail_allowed && **tail == ':') {
1718 1718 return true;
1719 1719 }
1720 1720 }
1721 1721 }
1722 1722 return false;
1723 1723 }
1724 1724
1725 1725 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1726 1726 julong* long_arg,
1727 1727 julong min_size) {
1728 1728 if (!atomull(s, long_arg)) return arg_unreadable;
1729 1729 return check_memory_size(*long_arg, min_size);
1730 1730 }
1731 1731
1732 1732 // Parse JavaVMInitArgs structure
1733 1733
1734 1734 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1735 1735 // For components of the system classpath.
1736 1736 SysClassPath scp(Arguments::get_sysclasspath());
1737 1737 bool scp_assembly_required = false;
1738 1738
1739 1739 // Save default settings for some mode flags
1740 1740 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1741 1741 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1742 1742 Arguments::_ClipInlining = ClipInlining;
1743 1743 Arguments::_BackgroundCompilation = BackgroundCompilation;
1744 1744 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1745 1745
1746 1746 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1747 1747 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1748 1748 if (result != JNI_OK) {
1749 1749 return result;
1750 1750 }
1751 1751
1752 1752 // Parse JavaVMInitArgs structure passed in
1753 1753 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1754 1754 if (result != JNI_OK) {
1755 1755 return result;
1756 1756 }
1757 1757
1758 1758 if (AggressiveOpts) {
1759 1759 // Insert alt-rt.jar between user-specified bootclasspath
1760 1760 // prefix and the default bootclasspath. os::set_boot_path()
1761 1761 // uses meta_index_dir as the default bootclasspath directory.
1762 1762 const char* altclasses_jar = "alt-rt.jar";
1763 1763 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1764 1764 strlen(altclasses_jar);
1765 1765 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1766 1766 strcpy(altclasses_path, get_meta_index_dir());
1767 1767 strcat(altclasses_path, altclasses_jar);
1768 1768 scp.add_suffix_to_prefix(altclasses_path);
1769 1769 scp_assembly_required = true;
1770 1770 FREE_C_HEAP_ARRAY(char, altclasses_path);
1771 1771 }
1772 1772
1773 1773 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1774 1774 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1775 1775 if (result != JNI_OK) {
1776 1776 return result;
1777 1777 }
1778 1778
1779 1779 // Do final processing now that all arguments have been parsed
1780 1780 result = finalize_vm_init_args(&scp, scp_assembly_required);
1781 1781 if (result != JNI_OK) {
1782 1782 return result;
1783 1783 }
1784 1784
1785 1785 return JNI_OK;
1786 1786 }
1787 1787
1788 1788 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1789 1789 SysClassPath* scp_p,
1790 1790 bool* scp_assembly_required_p,
1791 1791 FlagValueOrigin origin) {
1792 1792 // Remaining part of option string
1793 1793 const char* tail;
1794 1794
1795 1795 // iterate over arguments
1796 1796 for (int index = 0; index < args->nOptions; index++) {
1797 1797 bool is_absolute_path = false; // for -agentpath vs -agentlib
1798 1798
1799 1799 const JavaVMOption* option = args->options + index;
1800 1800
1801 1801 if (!match_option(option, "-Djava.class.path", &tail) &&
1802 1802 !match_option(option, "-Dsun.java.command", &tail) &&
1803 1803 !match_option(option, "-Dsun.java.launcher", &tail)) {
1804 1804
1805 1805 // add all jvm options to the jvm_args string. This string
1806 1806 // is used later to set the java.vm.args PerfData string constant.
1807 1807 // the -Djava.class.path and the -Dsun.java.command options are
1808 1808 // omitted from jvm_args string as each have their own PerfData
1809 1809 // string constant object.
1810 1810 build_jvm_args(option->optionString);
1811 1811 }
1812 1812
1813 1813 // -verbose:[class/gc/jni]
1814 1814 if (match_option(option, "-verbose", &tail)) {
1815 1815 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1816 1816 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1817 1817 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1818 1818 } else if (!strcmp(tail, ":gc")) {
1819 1819 FLAG_SET_CMDLINE(bool, PrintGC, true);
1820 1820 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1821 1821 } else if (!strcmp(tail, ":jni")) {
1822 1822 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1823 1823 }
1824 1824 // -da / -ea / -disableassertions / -enableassertions
1825 1825 // These accept an optional class/package name separated by a colon, e.g.,
1826 1826 // -da:java.lang.Thread.
1827 1827 } else if (match_option(option, user_assertion_options, &tail, true)) {
1828 1828 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1829 1829 if (*tail == '\0') {
1830 1830 JavaAssertions::setUserClassDefault(enable);
1831 1831 } else {
1832 1832 assert(*tail == ':', "bogus match by match_option()");
1833 1833 JavaAssertions::addOption(tail + 1, enable);
1834 1834 }
1835 1835 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1836 1836 } else if (match_option(option, system_assertion_options, &tail, false)) {
1837 1837 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1838 1838 JavaAssertions::setSystemClassDefault(enable);
1839 1839 // -bootclasspath:
1840 1840 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1841 1841 scp_p->reset_path(tail);
1842 1842 *scp_assembly_required_p = true;
1843 1843 // -bootclasspath/a:
1844 1844 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1845 1845 scp_p->add_suffix(tail);
1846 1846 *scp_assembly_required_p = true;
1847 1847 // -bootclasspath/p:
1848 1848 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1849 1849 scp_p->add_prefix(tail);
1850 1850 *scp_assembly_required_p = true;
1851 1851 // -Xrun
1852 1852 } else if (match_option(option, "-Xrun", &tail)) {
1853 1853 if (tail != NULL) {
1854 1854 const char* pos = strchr(tail, ':');
1855 1855 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1856 1856 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1857 1857 name[len] = '\0';
1858 1858
1859 1859 char *options = NULL;
1860 1860 if(pos != NULL) {
1861 1861 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1862 1862 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1863 1863 }
1864 1864 #ifdef JVMTI_KERNEL
1865 1865 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1866 1866 warning("profiling and debugging agents are not supported with Kernel VM");
1867 1867 } else
1868 1868 #endif // JVMTI_KERNEL
1869 1869 add_init_library(name, options);
1870 1870 }
1871 1871 // -agentlib and -agentpath
1872 1872 } else if (match_option(option, "-agentlib:", &tail) ||
1873 1873 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1874 1874 if(tail != NULL) {
1875 1875 const char* pos = strchr(tail, '=');
1876 1876 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1877 1877 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1878 1878 name[len] = '\0';
1879 1879
1880 1880 char *options = NULL;
1881 1881 if(pos != NULL) {
1882 1882 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1883 1883 }
1884 1884 #ifdef JVMTI_KERNEL
1885 1885 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1886 1886 warning("profiling and debugging agents are not supported with Kernel VM");
1887 1887 } else
1888 1888 #endif // JVMTI_KERNEL
1889 1889 add_init_agent(name, options, is_absolute_path);
1890 1890
1891 1891 }
1892 1892 // -javaagent
1893 1893 } else if (match_option(option, "-javaagent:", &tail)) {
1894 1894 if(tail != NULL) {
1895 1895 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1896 1896 add_init_agent("instrument", options, false);
1897 1897 }
1898 1898 // -Xnoclassgc
1899 1899 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1900 1900 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1901 1901 // -Xincgc: i-CMS
1902 1902 } else if (match_option(option, "-Xincgc", &tail)) {
1903 1903 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1904 1904 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1905 1905 // -Xnoincgc: no i-CMS
1906 1906 } else if (match_option(option, "-Xnoincgc", &tail)) {
1907 1907 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1908 1908 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1909 1909 // -Xconcgc
1910 1910 } else if (match_option(option, "-Xconcgc", &tail)) {
1911 1911 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1912 1912 // -Xnoconcgc
1913 1913 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1914 1914 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1915 1915 // -Xbatch
1916 1916 } else if (match_option(option, "-Xbatch", &tail)) {
1917 1917 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1918 1918 // -Xmn for compatibility with other JVM vendors
1919 1919 } else if (match_option(option, "-Xmn", &tail)) {
1920 1920 julong long_initial_eden_size = 0;
1921 1921 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1922 1922 if (errcode != arg_in_range) {
1923 1923 jio_fprintf(defaultStream::error_stream(),
1924 1924 "Invalid initial eden size: %s\n", option->optionString);
1925 1925 describe_range_error(errcode);
1926 1926 return JNI_EINVAL;
1927 1927 }
1928 1928 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1929 1929 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1930 1930 // -Xms
1931 1931 } else if (match_option(option, "-Xms", &tail)) {
1932 1932 julong long_initial_heap_size = 0;
1933 1933 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1934 1934 if (errcode != arg_in_range) {
1935 1935 jio_fprintf(defaultStream::error_stream(),
1936 1936 "Invalid initial heap size: %s\n", option->optionString);
1937 1937 describe_range_error(errcode);
1938 1938 return JNI_EINVAL;
1939 1939 }
1940 1940 set_initial_heap_size((size_t) long_initial_heap_size);
1941 1941 // Currently the minimum size and the initial heap sizes are the same.
1942 1942 set_min_heap_size(initial_heap_size());
1943 1943 // -Xmx
1944 1944 } else if (match_option(option, "-Xmx", &tail)) {
1945 1945 julong long_max_heap_size = 0;
1946 1946 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1947 1947 if (errcode != arg_in_range) {
1948 1948 jio_fprintf(defaultStream::error_stream(),
1949 1949 "Invalid maximum heap size: %s\n", option->optionString);
1950 1950 describe_range_error(errcode);
1951 1951 return JNI_EINVAL;
1952 1952 }
1953 1953 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1954 1954 // Xmaxf
1955 1955 } else if (match_option(option, "-Xmaxf", &tail)) {
1956 1956 int maxf = (int)(atof(tail) * 100);
1957 1957 if (maxf < 0 || maxf > 100) {
1958 1958 jio_fprintf(defaultStream::error_stream(),
1959 1959 "Bad max heap free percentage size: %s\n",
1960 1960 option->optionString);
1961 1961 return JNI_EINVAL;
1962 1962 } else {
1963 1963 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1964 1964 }
1965 1965 // Xminf
1966 1966 } else if (match_option(option, "-Xminf", &tail)) {
1967 1967 int minf = (int)(atof(tail) * 100);
1968 1968 if (minf < 0 || minf > 100) {
1969 1969 jio_fprintf(defaultStream::error_stream(),
1970 1970 "Bad min heap free percentage size: %s\n",
1971 1971 option->optionString);
1972 1972 return JNI_EINVAL;
1973 1973 } else {
1974 1974 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1975 1975 }
1976 1976 // -Xss
1977 1977 } else if (match_option(option, "-Xss", &tail)) {
1978 1978 julong long_ThreadStackSize = 0;
1979 1979 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1980 1980 if (errcode != arg_in_range) {
1981 1981 jio_fprintf(defaultStream::error_stream(),
1982 1982 "Invalid thread stack size: %s\n", option->optionString);
1983 1983 describe_range_error(errcode);
1984 1984 return JNI_EINVAL;
1985 1985 }
1986 1986 // Internally track ThreadStackSize in units of 1024 bytes.
1987 1987 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1988 1988 round_to((int)long_ThreadStackSize, K) / K);
1989 1989 // -Xoss
1990 1990 } else if (match_option(option, "-Xoss", &tail)) {
1991 1991 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1992 1992 // -Xmaxjitcodesize
1993 1993 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1994 1994 julong long_ReservedCodeCacheSize = 0;
1995 1995 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1996 1996 (size_t)InitialCodeCacheSize);
1997 1997 if (errcode != arg_in_range) {
1998 1998 jio_fprintf(defaultStream::error_stream(),
1999 1999 "Invalid maximum code cache size: %s\n",
2000 2000 option->optionString);
2001 2001 describe_range_error(errcode);
2002 2002 return JNI_EINVAL;
2003 2003 }
2004 2004 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2005 2005 // -green
2006 2006 } else if (match_option(option, "-green", &tail)) {
2007 2007 jio_fprintf(defaultStream::error_stream(),
2008 2008 "Green threads support not available\n");
2009 2009 return JNI_EINVAL;
2010 2010 // -native
2011 2011 } else if (match_option(option, "-native", &tail)) {
2012 2012 // HotSpot always uses native threads, ignore silently for compatibility
2013 2013 // -Xsqnopause
2014 2014 } else if (match_option(option, "-Xsqnopause", &tail)) {
2015 2015 // EVM option, ignore silently for compatibility
2016 2016 // -Xrs
2017 2017 } else if (match_option(option, "-Xrs", &tail)) {
2018 2018 // Classic/EVM option, new functionality
2019 2019 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2020 2020 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2021 2021 // change default internal VM signals used - lower case for back compat
2022 2022 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2023 2023 // -Xoptimize
2024 2024 } else if (match_option(option, "-Xoptimize", &tail)) {
2025 2025 // EVM option, ignore silently for compatibility
2026 2026 // -Xprof
2027 2027 } else if (match_option(option, "-Xprof", &tail)) {
2028 2028 #ifndef FPROF_KERNEL
2029 2029 _has_profile = true;
2030 2030 #else // FPROF_KERNEL
2031 2031 // do we have to exit?
2032 2032 warning("Kernel VM does not support flat profiling.");
2033 2033 #endif // FPROF_KERNEL
2034 2034 // -Xaprof
2035 2035 } else if (match_option(option, "-Xaprof", &tail)) {
2036 2036 _has_alloc_profile = true;
2037 2037 // -Xconcurrentio
2038 2038 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2039 2039 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2040 2040 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2041 2041 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2042 2042 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2043 2043 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2044 2044
2045 2045 // -Xinternalversion
2046 2046 } else if (match_option(option, "-Xinternalversion", &tail)) {
2047 2047 jio_fprintf(defaultStream::output_stream(), "%s\n",
2048 2048 VM_Version::internal_vm_info_string());
2049 2049 vm_exit(0);
2050 2050 #ifndef PRODUCT
2051 2051 // -Xprintflags
2052 2052 } else if (match_option(option, "-Xprintflags", &tail)) {
2053 2053 CommandLineFlags::printFlags();
2054 2054 vm_exit(0);
2055 2055 #endif
2056 2056 // -D
2057 2057 } else if (match_option(option, "-D", &tail)) {
2058 2058 if (!add_property(tail)) {
2059 2059 return JNI_ENOMEM;
2060 2060 }
2061 2061 // Out of the box management support
2062 2062 if (match_option(option, "-Dcom.sun.management", &tail)) {
2063 2063 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2064 2064 }
2065 2065 // -Xint
2066 2066 } else if (match_option(option, "-Xint", &tail)) {
2067 2067 set_mode_flags(_int);
2068 2068 // -Xmixed
2069 2069 } else if (match_option(option, "-Xmixed", &tail)) {
2070 2070 set_mode_flags(_mixed);
2071 2071 // -Xcomp
2072 2072 } else if (match_option(option, "-Xcomp", &tail)) {
2073 2073 // for testing the compiler; turn off all flags that inhibit compilation
2074 2074 set_mode_flags(_comp);
2075 2075
2076 2076 // -Xshare:dump
2077 2077 } else if (match_option(option, "-Xshare:dump", &tail)) {
2078 2078 #ifdef TIERED
2079 2079 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2080 2080 set_mode_flags(_int); // Prevent compilation, which creates objects
2081 2081 #elif defined(COMPILER2)
2082 2082 vm_exit_during_initialization(
2083 2083 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2084 2084 #elif defined(KERNEL)
2085 2085 vm_exit_during_initialization(
2086 2086 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2087 2087 #else
2088 2088 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2089 2089 set_mode_flags(_int); // Prevent compilation, which creates objects
2090 2090 #endif
2091 2091 // -Xshare:on
2092 2092 } else if (match_option(option, "-Xshare:on", &tail)) {
2093 2093 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2094 2094 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2095 2095 #ifdef TIERED
2096 2096 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2097 2097 #endif // TIERED
2098 2098 // -Xshare:auto
2099 2099 } else if (match_option(option, "-Xshare:auto", &tail)) {
2100 2100 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2101 2101 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2102 2102 // -Xshare:off
2103 2103 } else if (match_option(option, "-Xshare:off", &tail)) {
2104 2104 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2105 2105 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2106 2106
2107 2107 // -Xverify
2108 2108 } else if (match_option(option, "-Xverify", &tail)) {
2109 2109 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2110 2110 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2111 2111 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2112 2112 } else if (strcmp(tail, ":remote") == 0) {
2113 2113 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2114 2114 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2115 2115 } else if (strcmp(tail, ":none") == 0) {
2116 2116 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2117 2117 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2118 2118 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2119 2119 return JNI_EINVAL;
2120 2120 }
2121 2121 // -Xdebug
2122 2122 } else if (match_option(option, "-Xdebug", &tail)) {
2123 2123 // note this flag has been used, then ignore
2124 2124 set_xdebug_mode(true);
2125 2125 // -Xnoagent
2126 2126 } else if (match_option(option, "-Xnoagent", &tail)) {
2127 2127 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2128 2128 } else if (match_option(option, "-Xboundthreads", &tail)) {
2129 2129 // Bind user level threads to kernel threads (Solaris only)
2130 2130 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2131 2131 } else if (match_option(option, "-Xloggc:", &tail)) {
2132 2132 // Redirect GC output to the file. -Xloggc:<filename>
2133 2133 // ostream_init_log(), when called will use this filename
2134 2134 // to initialize a fileStream.
2135 2135 _gc_log_filename = strdup(tail);
2136 2136 FLAG_SET_CMDLINE(bool, PrintGC, true);
2137 2137 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2138 2138 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2139 2139
2140 2140 // JNI hooks
2141 2141 } else if (match_option(option, "-Xcheck", &tail)) {
2142 2142 if (!strcmp(tail, ":jni")) {
2143 2143 CheckJNICalls = true;
2144 2144 } else if (is_bad_option(option, args->ignoreUnrecognized,
2145 2145 "check")) {
2146 2146 return JNI_EINVAL;
2147 2147 }
2148 2148 } else if (match_option(option, "vfprintf", &tail)) {
2149 2149 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2150 2150 } else if (match_option(option, "exit", &tail)) {
2151 2151 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2152 2152 } else if (match_option(option, "abort", &tail)) {
2153 2153 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2154 2154 // -XX:+AggressiveHeap
2155 2155 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2156 2156
2157 2157 // This option inspects the machine and attempts to set various
2158 2158 // parameters to be optimal for long-running, memory allocation
2159 2159 // intensive jobs. It is intended for machines with large
2160 2160 // amounts of cpu and memory.
2161 2161
2162 2162 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2163 2163 // VM, but we may not be able to represent the total physical memory
2164 2164 // available (like having 8gb of memory on a box but using a 32bit VM).
2165 2165 // Thus, we need to make sure we're using a julong for intermediate
2166 2166 // calculations.
2167 2167 julong initHeapSize;
2168 2168 julong total_memory = os::physical_memory();
2169 2169
2170 2170 if (total_memory < (julong)256*M) {
2171 2171 jio_fprintf(defaultStream::error_stream(),
2172 2172 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2173 2173 vm_exit(1);
2174 2174 }
2175 2175
2176 2176 // The heap size is half of available memory, or (at most)
2177 2177 // all of possible memory less 160mb (leaving room for the OS
2178 2178 // when using ISM). This is the maximum; because adaptive sizing
2179 2179 // is turned on below, the actual space used may be smaller.
2180 2180
2181 2181 initHeapSize = MIN2(total_memory / (julong)2,
2182 2182 total_memory - (julong)160*M);
2183 2183
2184 2184 // Make sure that if we have a lot of memory we cap the 32 bit
2185 2185 // process space. The 64bit VM version of this function is a nop.
2186 2186 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2187 2187
2188 2188 // The perm gen is separate but contiguous with the
2189 2189 // object heap (and is reserved with it) so subtract it
2190 2190 // from the heap size.
2191 2191 if (initHeapSize > MaxPermSize) {
2192 2192 initHeapSize = initHeapSize - MaxPermSize;
2193 2193 } else {
2194 2194 warning("AggressiveHeap and MaxPermSize values may conflict");
2195 2195 }
2196 2196
2197 2197 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2198 2198 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2199 2199 set_initial_heap_size(MaxHeapSize);
2200 2200 // Currently the minimum size and the initial heap sizes are the same.
2201 2201 set_min_heap_size(initial_heap_size());
2202 2202 }
2203 2203 if (FLAG_IS_DEFAULT(NewSize)) {
2204 2204 // Make the young generation 3/8ths of the total heap.
2205 2205 FLAG_SET_CMDLINE(uintx, NewSize,
2206 2206 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2207 2207 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2208 2208 }
2209 2209
2210 2210 FLAG_SET_DEFAULT(UseLargePages, true);
2211 2211
2212 2212 // Increase some data structure sizes for efficiency
2213 2213 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2214 2214 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2215 2215 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2216 2216
2217 2217 // See the OldPLABSize comment below, but replace 'after promotion'
2218 2218 // with 'after copying'. YoungPLABSize is the size of the survivor
2219 2219 // space per-gc-thread buffers. The default is 4kw.
2220 2220 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2221 2221
2222 2222 // OldPLABSize is the size of the buffers in the old gen that
2223 2223 // UseParallelGC uses to promote live data that doesn't fit in the
2224 2224 // survivor spaces. At any given time, there's one for each gc thread.
2225 2225 // The default size is 1kw. These buffers are rarely used, since the
2226 2226 // survivor spaces are usually big enough. For specjbb, however, there
2227 2227 // are occasions when there's lots of live data in the young gen
2228 2228 // and we end up promoting some of it. We don't have a definite
2229 2229 // explanation for why bumping OldPLABSize helps, but the theory
2230 2230 // is that a bigger PLAB results in retaining something like the
2231 2231 // original allocation order after promotion, which improves mutator
2232 2232 // locality. A minor effect may be that larger PLABs reduce the
2233 2233 // number of PLAB allocation events during gc. The value of 8kw
2234 2234 // was arrived at by experimenting with specjbb.
2235 2235 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2236 2236
2237 2237 // CompilationPolicyChoice=0 causes the server compiler to adopt
2238 2238 // a more conservative which-method-do-I-compile policy when one
2239 2239 // of the counters maintained by the interpreter trips. The
2240 2240 // result is reduced startup time and improved specjbb and
2241 2241 // alacrity performance. Zero is the default, but we set it
2242 2242 // explicitly here in case the default changes.
2243 2243 // See runtime/compilationPolicy.*.
2244 2244 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2245 2245
2246 2246 // Enable parallel GC and adaptive generation sizing
2247 2247 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2248 2248 FLAG_SET_DEFAULT(ParallelGCThreads,
2249 2249 Abstract_VM_Version::parallel_worker_threads());
2250 2250
2251 2251 // Encourage steady state memory management
2252 2252 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2253 2253
2254 2254 // This appears to improve mutator locality
2255 2255 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2256 2256
2257 2257 // Get around early Solaris scheduling bug
2258 2258 // (affinity vs other jobs on system)
2259 2259 // but disallow DR and offlining (5008695).
2260 2260 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2261 2261
2262 2262 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2263 2263 // The last option must always win.
2264 2264 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2265 2265 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2266 2266 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2267 2267 // The last option must always win.
2268 2268 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2269 2269 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2270 2270 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2271 2271 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2272 2272 jio_fprintf(defaultStream::error_stream(),
2273 2273 "Please use CMSClassUnloadingEnabled in place of "
2274 2274 "CMSPermGenSweepingEnabled in the future\n");
2275 2275 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2276 2276 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2277 2277 jio_fprintf(defaultStream::error_stream(),
2278 2278 "Please use -XX:+UseGCOverheadLimit in place of "
2279 2279 "-XX:+UseGCTimeLimit in the future\n");
2280 2280 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2281 2281 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2282 2282 jio_fprintf(defaultStream::error_stream(),
2283 2283 "Please use -XX:-UseGCOverheadLimit in place of "
2284 2284 "-XX:-UseGCTimeLimit in the future\n");
2285 2285 // The TLE options are for compatibility with 1.3 and will be
2286 2286 // removed without notice in a future release. These options
2287 2287 // are not to be documented.
2288 2288 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2289 2289 // No longer used.
2290 2290 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2291 2291 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2292 2292 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2293 2293 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2294 2294 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2295 2295 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2296 2296 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2297 2297 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2298 2298 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2299 2299 // No longer used.
2300 2300 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2301 2301 julong long_tlab_size = 0;
2302 2302 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2303 2303 if (errcode != arg_in_range) {
2304 2304 jio_fprintf(defaultStream::error_stream(),
2305 2305 "Invalid TLAB size: %s\n", option->optionString);
2306 2306 describe_range_error(errcode);
2307 2307 return JNI_EINVAL;
2308 2308 }
2309 2309 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2310 2310 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2311 2311 // No longer used.
2312 2312 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2313 2313 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2314 2314 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2315 2315 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2316 2316 SOLARIS_ONLY(
2317 2317 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2318 2318 warning("-XX:+UsePermISM is obsolete.");
2319 2319 FLAG_SET_CMDLINE(bool, UseISM, true);
2320 2320 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2321 2321 FLAG_SET_CMDLINE(bool, UseISM, false);
2322 2322 )
2323 2323 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2324 2324 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2325 2325 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2326 2326 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2327 2327 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2328 2328 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2329 2329 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2330 2330 #ifdef SOLARIS
2331 2331 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2332 2332 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2333 2333 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2334 2334 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2335 2335 #else // ndef SOLARIS
2336 2336 jio_fprintf(defaultStream::error_stream(),
2337 2337 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2338 2338 return JNI_EINVAL;
2339 2339 #endif // ndef SOLARIS
2340 2340 } else
2341 2341 #ifdef ASSERT
2342 2342 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2343 2343 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2344 2344 // disable scavenge before parallel mark-compact
2345 2345 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2346 2346 } else
2347 2347 #endif
2348 2348 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2349 2349 julong cms_blocks_to_claim = (julong)atol(tail);
2350 2350 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2351 2351 jio_fprintf(defaultStream::error_stream(),
2352 2352 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2353 2353 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2354 2354 } else
2355 2355 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2356 2356 julong old_plab_size = 0;
2357 2357 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2358 2358 if (errcode != arg_in_range) {
2359 2359 jio_fprintf(defaultStream::error_stream(),
2360 2360 "Invalid old PLAB size: %s\n", option->optionString);
2361 2361 describe_range_error(errcode);
2362 2362 return JNI_EINVAL;
2363 2363 }
2364 2364 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2365 2365 jio_fprintf(defaultStream::error_stream(),
2366 2366 "Please use -XX:OldPLABSize in place of "
2367 2367 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2368 2368 } else
2369 2369 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2370 2370 julong young_plab_size = 0;
2371 2371 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2372 2372 if (errcode != arg_in_range) {
2373 2373 jio_fprintf(defaultStream::error_stream(),
2374 2374 "Invalid young PLAB size: %s\n", option->optionString);
2375 2375 describe_range_error(errcode);
2376 2376 return JNI_EINVAL;
2377 2377 }
2378 2378 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2379 2379 jio_fprintf(defaultStream::error_stream(),
2380 2380 "Please use -XX:YoungPLABSize in place of "
2381 2381 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2382 2382 } else
2383 2383 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2384 2384 // Skip -XX:Flags= since that case has already been handled
2385 2385 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2386 2386 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2387 2387 return JNI_EINVAL;
2388 2388 }
2389 2389 }
2390 2390 // Unknown option
2391 2391 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2392 2392 return JNI_ERR;
2393 2393 }
2394 2394 }
2395 2395 // Change the default value for flags which have different default values
2396 2396 // when working with older JDKs.
2397 2397 if (JDK_Version::current().compare_major(6) <= 0 &&
2398 2398 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2399 2399 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2400 2400 }
2401 2401 return JNI_OK;
2402 2402 }
2403 2403
2404 2404 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2405 2405 // This must be done after all -D arguments have been processed.
2406 2406 scp_p->expand_endorsed();
2407 2407
2408 2408 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2409 2409 // Assemble the bootclasspath elements into the final path.
2410 2410 Arguments::set_sysclasspath(scp_p->combined_path());
2411 2411 }
2412 2412
2413 2413 // This must be done after all arguments have been processed.
2414 2414 // java_compiler() true means set to "NONE" or empty.
2415 2415 if (java_compiler() && !xdebug_mode()) {
2416 2416 // For backwards compatibility, we switch to interpreted mode if
2417 2417 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2418 2418 // not specified.
2419 2419 set_mode_flags(_int);
2420 2420 }
2421 2421 if (CompileThreshold == 0) {
2422 2422 set_mode_flags(_int);
2423 2423 }
2424 2424
2425 2425 #ifdef TIERED
2426 2426 // If we are using tiered compilation in the tiered vm then c1 will
2427 2427 // do the profiling and we don't want to waste that time in the
2428 2428 // interpreter.
2429 2429 if (TieredCompilation) {
2430 2430 ProfileInterpreter = false;
2431 2431 } else {
2432 2432 // Since we are running vanilla server we must adjust the compile threshold
2433 2433 // unless the user has already adjusted it because the default threshold assumes
2434 2434 // we will run tiered.
2435 2435
2436 2436 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2437 2437 CompileThreshold = Tier2CompileThreshold;
2438 2438 }
2439 2439 }
2440 2440 #endif // TIERED
2441 2441
2442 2442 #ifndef COMPILER2
2443 2443 // Don't degrade server performance for footprint
2444 2444 if (FLAG_IS_DEFAULT(UseLargePages) &&
2445 2445 MaxHeapSize < LargePageHeapSizeThreshold) {
2446 2446 // No need for large granularity pages w/small heaps.
2447 2447 // Note that large pages are enabled/disabled for both the
2448 2448 // Java heap and the code cache.
2449 2449 FLAG_SET_DEFAULT(UseLargePages, false);
2450 2450 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2451 2451 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2452 2452 }
2453 2453
2454 2454 #else
2455 2455 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2456 2456 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2457 2457 }
2458 2458 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2459 2459 if (UseG1GC) {
2460 2460 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2461 2461 }
2462 2462 #endif
2463 2463
2464 2464 if (!check_vm_args_consistency()) {
2465 2465 return JNI_ERR;
2466 2466 }
2467 2467
2468 2468 return JNI_OK;
2469 2469 }
2470 2470
2471 2471 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2472 2472 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2473 2473 scp_assembly_required_p);
2474 2474 }
2475 2475
2476 2476 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2477 2477 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2478 2478 scp_assembly_required_p);
2479 2479 }
2480 2480
2481 2481 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2482 2482 const int N_MAX_OPTIONS = 64;
2483 2483 const int OPTION_BUFFER_SIZE = 1024;
2484 2484 char buffer[OPTION_BUFFER_SIZE];
2485 2485
2486 2486 // The variable will be ignored if it exceeds the length of the buffer.
2487 2487 // Don't check this variable if user has special privileges
2488 2488 // (e.g. unix su command).
2489 2489 if (os::getenv(name, buffer, sizeof(buffer)) &&
2490 2490 !os::have_special_privileges()) {
2491 2491 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2492 2492 jio_fprintf(defaultStream::error_stream(),
2493 2493 "Picked up %s: %s\n", name, buffer);
2494 2494 char* rd = buffer; // pointer to the input string (rd)
2495 2495 int i;
2496 2496 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2497 2497 while (isspace(*rd)) rd++; // skip whitespace
2498 2498 if (*rd == 0) break; // we re done when the input string is read completely
2499 2499
2500 2500 // The output, option string, overwrites the input string.
2501 2501 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2502 2502 // input string (rd).
2503 2503 char* wrt = rd;
2504 2504
2505 2505 options[i++].optionString = wrt; // Fill in option
2506 2506 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2507 2507 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2508 2508 int quote = *rd; // matching quote to look for
2509 2509 rd++; // don't copy open quote
2510 2510 while (*rd != quote) { // include everything (even spaces) up until quote
2511 2511 if (*rd == 0) { // string termination means unmatched string
2512 2512 jio_fprintf(defaultStream::error_stream(),
2513 2513 "Unmatched quote in %s\n", name);
2514 2514 return JNI_ERR;
2515 2515 }
2516 2516 *wrt++ = *rd++; // copy to option string
2517 2517 }
2518 2518 rd++; // don't copy close quote
2519 2519 } else {
2520 2520 *wrt++ = *rd++; // copy to option string
2521 2521 }
2522 2522 }
2523 2523 // Need to check if we're done before writing a NULL,
2524 2524 // because the write could be to the byte that rd is pointing to.
2525 2525 if (*rd++ == 0) {
2526 2526 *wrt = 0;
2527 2527 break;
2528 2528 }
2529 2529 *wrt = 0; // Zero terminate option
2530 2530 }
2531 2531 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2532 2532 JavaVMInitArgs vm_args;
2533 2533 vm_args.version = JNI_VERSION_1_2;
2534 2534 vm_args.options = options;
2535 2535 vm_args.nOptions = i;
2536 2536 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2537 2537
2538 2538 if (PrintVMOptions) {
2539 2539 const char* tail;
2540 2540 for (int i = 0; i < vm_args.nOptions; i++) {
2541 2541 const JavaVMOption *option = vm_args.options + i;
2542 2542 if (match_option(option, "-XX:", &tail)) {
2543 2543 logOption(tail);
2544 2544 }
2545 2545 }
2546 2546 }
2547 2547
2548 2548 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2549 2549 }
2550 2550 return JNI_OK;
2551 2551 }
2552 2552
2553 2553 // Parse entry point called from JNI_CreateJavaVM
2554 2554
2555 2555 jint Arguments::parse(const JavaVMInitArgs* args) {
2556 2556
2557 2557 // Sharing support
2558 2558 // Construct the path to the archive
2559 2559 char jvm_path[JVM_MAXPATHLEN];
2560 2560 os::jvm_path(jvm_path, sizeof(jvm_path));
2561 2561 #ifdef TIERED
2562 2562 if (strstr(jvm_path, "client") != NULL) {
2563 2563 force_client_mode = true;
2564 2564 }
2565 2565 #endif // TIERED
2566 2566 char *end = strrchr(jvm_path, *os::file_separator());
2567 2567 if (end != NULL) *end = '\0';
2568 2568 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2569 2569 strlen(os::file_separator()) + 20);
2570 2570 if (shared_archive_path == NULL) return JNI_ENOMEM;
2571 2571 strcpy(shared_archive_path, jvm_path);
2572 2572 strcat(shared_archive_path, os::file_separator());
2573 2573 strcat(shared_archive_path, "classes");
2574 2574 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2575 2575 strcat(shared_archive_path, ".jsa");
2576 2576 SharedArchivePath = shared_archive_path;
2577 2577
2578 2578 // Remaining part of option string
2579 2579 const char* tail;
2580 2580
2581 2581 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2582 2582 bool settings_file_specified = false;
2583 2583 const char* flags_file;
2584 2584 int index;
2585 2585 for (index = 0; index < args->nOptions; index++) {
2586 2586 const JavaVMOption *option = args->options + index;
2587 2587 if (match_option(option, "-XX:Flags=", &tail)) {
2588 2588 flags_file = tail;
2589 2589 settings_file_specified = true;
2590 2590 }
2591 2591 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2592 2592 PrintVMOptions = true;
2593 2593 }
2594 2594 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2595 2595 PrintVMOptions = false;
2596 2596 }
2597 2597 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2598 2598 IgnoreUnrecognizedVMOptions = true;
2599 2599 }
2600 2600 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2601 2601 IgnoreUnrecognizedVMOptions = false;
2602 2602 }
2603 2603 }
2604 2604
2605 2605 if (IgnoreUnrecognizedVMOptions) {
2606 2606 // uncast const to modify the flag args->ignoreUnrecognized
2607 2607 *(jboolean*)(&args->ignoreUnrecognized) = true;
2608 2608 }
2609 2609
2610 2610 // Parse specified settings file
2611 2611 if (settings_file_specified) {
2612 2612 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2613 2613 return JNI_EINVAL;
2614 2614 }
2615 2615 }
2616 2616
2617 2617 // Parse default .hotspotrc settings file
2618 2618 if (!settings_file_specified) {
2619 2619 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2620 2620 return JNI_EINVAL;
2621 2621 }
2622 2622 }
2623 2623
2624 2624 if (PrintVMOptions) {
2625 2625 for (index = 0; index < args->nOptions; index++) {
2626 2626 const JavaVMOption *option = args->options + index;
2627 2627 if (match_option(option, "-XX:", &tail)) {
2628 2628 logOption(tail);
2629 2629 }
2630 2630 }
2631 2631 }
2632 2632
2633 2633 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2634 2634 jint result = parse_vm_init_args(args);
2635 2635 if (result != JNI_OK) {
2636 2636 return result;
2637 2637 }
2638 2638
2639 2639 #ifndef PRODUCT
2640 2640 if (TraceBytecodesAt != 0) {
2641 2641 TraceBytecodes = true;
2642 2642 }
2643 2643 if (CountCompiledCalls) {
2644 2644 if (UseCounterDecay) {
2645 2645 warning("UseCounterDecay disabled because CountCalls is set");
2646 2646 UseCounterDecay = false;
2647 2647 }
2648 2648 }
2649 2649 #endif // PRODUCT
2650 2650
2651 2651 if (EnableInvokeDynamic && !EnableMethodHandles) {
2652 2652 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2653 2653 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2654 2654 }
2655 2655 EnableMethodHandles = true;
2656 2656 }
2657 2657 if (EnableMethodHandles && !AnonymousClasses) {
2658 2658 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
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2659 2659 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2660 2660 }
2661 2661 AnonymousClasses = true;
2662 2662 }
2663 2663 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2664 2664 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2665 2665 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2666 2666 }
2667 2667 ScavengeRootsInCode = 1;
2668 2668 }
2669 +#ifdef COMPILER2
2670 + if (EnableInvokeDynamic && DoEscapeAnalysis) {
2671 + // TODO: We need to find rules for invokedynamic and EA. For now,
2672 + // simply disable EA by default.
2673 + if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2674 + DoEscapeAnalysis = false;
2675 + }
2676 + }
2677 +#endif
2669 2678
2670 2679 if (PrintGCDetails) {
2671 2680 // Turn on -verbose:gc options as well
2672 2681 PrintGC = true;
2673 2682 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2674 2683 TraceClassUnloading = true;
2675 2684 }
2676 2685 }
2677 2686
2678 2687 #ifdef SERIALGC
2679 2688 set_serial_gc_flags();
2680 2689 #endif // SERIALGC
2681 2690 #ifdef KERNEL
2682 2691 no_shared_spaces();
2683 2692 #endif // KERNEL
2684 2693
2685 2694 // Set flags based on ergonomics.
2686 2695 set_ergonomics_flags();
2687 2696
2697 +#ifdef _LP64
2698 + // XXX JSR 292 currently does not support compressed oops.
2699 + if (EnableMethodHandles && UseCompressedOops) {
2700 + if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2701 + UseCompressedOops = false;
2702 + }
2703 + }
2704 +#endif // _LP64
2705 +
2688 2706 // Check the GC selections again.
2689 2707 if (!check_gc_consistency()) {
2690 2708 return JNI_EINVAL;
2691 2709 }
2692 2710
2693 2711 if (UseParallelGC || UseParallelOldGC) {
2694 2712 // Set some flags for ParallelGC if needed.
2695 2713 set_parallel_gc_flags();
2696 2714 } else if (UseConcMarkSweepGC) {
2697 2715 // Set some flags for CMS
2698 2716 set_cms_and_parnew_gc_flags();
2699 2717 } else if (UseParNewGC) {
2700 2718 // Set some flags for ParNew
2701 2719 set_parnew_gc_flags();
2702 2720 } else if (UseG1GC) {
2703 2721 // Set some flags for garbage-first, if needed.
2704 2722 set_g1_gc_flags();
2705 2723 }
2706 2724
2707 2725 #ifdef SERIALGC
2708 2726 assert(verify_serial_gc_flags(), "SerialGC unset");
2709 2727 #endif // SERIALGC
2710 2728
2711 2729 // Set bytecode rewriting flags
2712 2730 set_bytecode_flags();
2713 2731
2714 2732 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2715 2733 set_aggressive_opts_flags();
2716 2734
2717 2735 #ifdef CC_INTERP
2718 2736 // Biased locking is not implemented with c++ interpreter
2719 2737 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2720 2738 #endif /* CC_INTERP */
2721 2739
2722 2740 #ifdef COMPILER2
2723 2741 if (!UseBiasedLocking || EmitSync != 0) {
2724 2742 UseOptoBiasInlining = false;
2725 2743 }
2726 2744 #endif
2727 2745
2728 2746 if (PrintCommandLineFlags) {
2729 2747 CommandLineFlags::printSetFlags();
2730 2748 }
2731 2749
2732 2750 #ifdef ASSERT
2733 2751 if (PrintFlagsFinal) {
2734 2752 CommandLineFlags::printFlags();
2735 2753 }
2736 2754 #endif
2737 2755
2738 2756 return JNI_OK;
2739 2757 }
2740 2758
2741 2759 int Arguments::PropertyList_count(SystemProperty* pl) {
2742 2760 int count = 0;
2743 2761 while(pl != NULL) {
2744 2762 count++;
2745 2763 pl = pl->next();
2746 2764 }
2747 2765 return count;
2748 2766 }
2749 2767
2750 2768 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2751 2769 assert(key != NULL, "just checking");
2752 2770 SystemProperty* prop;
2753 2771 for (prop = pl; prop != NULL; prop = prop->next()) {
2754 2772 if (strcmp(key, prop->key()) == 0) return prop->value();
2755 2773 }
2756 2774 return NULL;
2757 2775 }
2758 2776
2759 2777 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2760 2778 int count = 0;
2761 2779 const char* ret_val = NULL;
2762 2780
2763 2781 while(pl != NULL) {
2764 2782 if(count >= index) {
2765 2783 ret_val = pl->key();
2766 2784 break;
2767 2785 }
2768 2786 count++;
2769 2787 pl = pl->next();
2770 2788 }
2771 2789
2772 2790 return ret_val;
2773 2791 }
2774 2792
2775 2793 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2776 2794 int count = 0;
2777 2795 char* ret_val = NULL;
2778 2796
2779 2797 while(pl != NULL) {
2780 2798 if(count >= index) {
2781 2799 ret_val = pl->value();
2782 2800 break;
2783 2801 }
2784 2802 count++;
2785 2803 pl = pl->next();
2786 2804 }
2787 2805
2788 2806 return ret_val;
2789 2807 }
2790 2808
2791 2809 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2792 2810 SystemProperty* p = *plist;
2793 2811 if (p == NULL) {
2794 2812 *plist = new_p;
2795 2813 } else {
2796 2814 while (p->next() != NULL) {
2797 2815 p = p->next();
2798 2816 }
2799 2817 p->set_next(new_p);
2800 2818 }
2801 2819 }
2802 2820
2803 2821 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2804 2822 if (plist == NULL)
2805 2823 return;
2806 2824
2807 2825 SystemProperty* new_p = new SystemProperty(k, v, true);
2808 2826 PropertyList_add(plist, new_p);
2809 2827 }
2810 2828
2811 2829 // This add maintains unique property key in the list.
2812 2830 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
2813 2831 if (plist == NULL)
2814 2832 return;
2815 2833
2816 2834 // If property key exist then update with new value.
2817 2835 SystemProperty* prop;
2818 2836 for (prop = *plist; prop != NULL; prop = prop->next()) {
2819 2837 if (strcmp(k, prop->key()) == 0) {
2820 2838 if (append) {
2821 2839 prop->append_value(v);
2822 2840 } else {
2823 2841 prop->set_value(v);
2824 2842 }
2825 2843 return;
2826 2844 }
2827 2845 }
2828 2846
2829 2847 PropertyList_add(plist, k, v);
2830 2848 }
2831 2849
2832 2850 #ifdef KERNEL
2833 2851 char *Arguments::get_kernel_properties() {
2834 2852 // Find properties starting with kernel and append them to string
2835 2853 // We need to find out how long they are first because the URL's that they
2836 2854 // might point to could get long.
2837 2855 int length = 0;
2838 2856 SystemProperty* prop;
2839 2857 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2840 2858 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2841 2859 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2842 2860 }
2843 2861 }
2844 2862 // Add one for null terminator.
2845 2863 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2846 2864 if (length != 0) {
2847 2865 int pos = 0;
2848 2866 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2849 2867 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2850 2868 jio_snprintf(&props[pos], length-pos,
2851 2869 "-D%s=%s ", prop->key(), prop->value());
2852 2870 pos = strlen(props);
2853 2871 }
2854 2872 }
2855 2873 }
2856 2874 // null terminate props in case of null
2857 2875 props[length] = '\0';
2858 2876 return props;
2859 2877 }
2860 2878 #endif // KERNEL
2861 2879
2862 2880 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2863 2881 // Returns true if all of the source pointed by src has been copied over to
2864 2882 // the destination buffer pointed by buf. Otherwise, returns false.
2865 2883 // Notes:
2866 2884 // 1. If the length (buflen) of the destination buffer excluding the
2867 2885 // NULL terminator character is not long enough for holding the expanded
2868 2886 // pid characters, it also returns false instead of returning the partially
2869 2887 // expanded one.
2870 2888 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2871 2889 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2872 2890 char* buf, size_t buflen) {
2873 2891 const char* p = src;
2874 2892 char* b = buf;
2875 2893 const char* src_end = &src[srclen];
2876 2894 char* buf_end = &buf[buflen - 1];
2877 2895
2878 2896 while (p < src_end && b < buf_end) {
2879 2897 if (*p == '%') {
2880 2898 switch (*(++p)) {
2881 2899 case '%': // "%%" ==> "%"
2882 2900 *b++ = *p++;
2883 2901 break;
2884 2902 case 'p': { // "%p" ==> current process id
2885 2903 // buf_end points to the character before the last character so
2886 2904 // that we could write '\0' to the end of the buffer.
2887 2905 size_t buf_sz = buf_end - b + 1;
2888 2906 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2889 2907
2890 2908 // if jio_snprintf fails or the buffer is not long enough to hold
2891 2909 // the expanded pid, returns false.
2892 2910 if (ret < 0 || ret >= (int)buf_sz) {
2893 2911 return false;
2894 2912 } else {
2895 2913 b += ret;
2896 2914 assert(*b == '\0', "fail in copy_expand_pid");
2897 2915 if (p == src_end && b == buf_end + 1) {
2898 2916 // reach the end of the buffer.
2899 2917 return true;
2900 2918 }
2901 2919 }
2902 2920 p++;
2903 2921 break;
2904 2922 }
2905 2923 default :
2906 2924 *b++ = '%';
2907 2925 }
2908 2926 } else {
2909 2927 *b++ = *p++;
2910 2928 }
2911 2929 }
2912 2930 *b = '\0';
2913 2931 return (p == src_end); // return false if not all of the source was copied
2914 2932 }
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