Mon, 30 Jun 2008 17:04:59 -0700
6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
Summary: experimental() flags will protect features of an experimental nature that are not supported in the regular product build. Made UseG1GC an experimental flag.
Reviewed-by: jmasa, kamg, coleenp
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_initial_heap_size = 0;
41 uintx Arguments::_min_heap_size = 0;
42 Arguments::Mode Arguments::_mode = _mixed;
43 bool Arguments::_java_compiler = false;
44 bool Arguments::_xdebug_mode = false;
45 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
46 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
47 int Arguments::_sun_java_launcher_pid = -1;
49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
50 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
51 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
52 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
53 bool Arguments::_ClipInlining = ClipInlining;
54 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
56 char* Arguments::SharedArchivePath = NULL;
58 AgentLibraryList Arguments::_libraryList;
59 AgentLibraryList Arguments::_agentList;
61 abort_hook_t Arguments::_abort_hook = NULL;
62 exit_hook_t Arguments::_exit_hook = NULL;
63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
66 SystemProperty *Arguments::_java_ext_dirs = NULL;
67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
69 SystemProperty *Arguments::_java_library_path = NULL;
70 SystemProperty *Arguments::_java_home = NULL;
71 SystemProperty *Arguments::_java_class_path = NULL;
72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
74 char* Arguments::_meta_index_path = NULL;
75 char* Arguments::_meta_index_dir = NULL;
77 static bool force_client_mode = false;
79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
81 static bool match_option(const JavaVMOption *option, const char* name,
82 const char** tail) {
83 int len = (int)strlen(name);
84 if (strncmp(option->optionString, name, len) == 0) {
85 *tail = option->optionString + len;
86 return true;
87 } else {
88 return false;
89 }
90 }
92 static void logOption(const char* opt) {
93 if (PrintVMOptions) {
94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 }
96 }
98 // Process java launcher properties.
99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
100 // See if sun.java.launcher or sun.java.launcher.pid is defined.
101 // Must do this before setting up other system properties,
102 // as some of them may depend on launcher type.
103 for (int index = 0; index < args->nOptions; index++) {
104 const JavaVMOption* option = args->options + index;
105 const char* tail;
107 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
108 process_java_launcher_argument(tail, option->extraInfo);
109 continue;
110 }
111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
112 _sun_java_launcher_pid = atoi(tail);
113 continue;
114 }
115 }
116 }
118 // Initialize system properties key and value.
119 void Arguments::init_system_properties() {
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
123 "Java Virtual Machine Specification", false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
125 "Sun Microsystems Inc.", false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
131 // following are JVMTI agent writeable properties.
132 // Properties values are set to NULL and they are
133 // os specific they are initialized in os::init_system_properties_values().
134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
137 _java_library_path = new SystemProperty("java.library.path", NULL, true);
138 _java_home = new SystemProperty("java.home", NULL, true);
139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
141 _java_class_path = new SystemProperty("java.class.path", "", true);
143 // Add to System Property list.
144 PropertyList_add(&_system_properties, _java_ext_dirs);
145 PropertyList_add(&_system_properties, _java_endorsed_dirs);
146 PropertyList_add(&_system_properties, _sun_boot_library_path);
147 PropertyList_add(&_system_properties, _java_library_path);
148 PropertyList_add(&_system_properties, _java_home);
149 PropertyList_add(&_system_properties, _java_class_path);
150 PropertyList_add(&_system_properties, _sun_boot_class_path);
152 // Set OS specific system properties values
153 os::init_system_properties_values();
154 }
156 // String containing commands that will be ignored and cause a
157 // warning to be issued. These commands should be accepted
158 // for 1.6 but not 1.7. The string should be cleared at the
159 // beginning of 1.7.
160 static const char* obsolete_jvm_flags_1_5_0[] = {
161 "UseTrainGC",
162 "UseSpecialLargeObjectHandling",
163 "UseOversizedCarHandling",
164 "TraceCarAllocation",
165 "PrintTrainGCProcessingStats",
166 "LogOfCarSpaceSize",
167 "OversizedCarThreshold",
168 "MinTickInterval",
169 "DefaultTickInterval",
170 "MaxTickInterval",
171 "DelayTickAdjustment",
172 "ProcessingToTenuringRatio",
173 "MinTrainLength",
174 0};
176 bool Arguments::made_obsolete_in_1_5_0(const char *s) {
177 int i = 0;
178 while (obsolete_jvm_flags_1_5_0[i] != NULL) {
179 // <flag>=xxx form
180 // [-|+]<flag> form
181 if ((strncmp(obsolete_jvm_flags_1_5_0[i], s,
182 strlen(obsolete_jvm_flags_1_5_0[i])) == 0) ||
183 ((s[0] == '+' || s[0] == '-') &&
184 (strncmp(obsolete_jvm_flags_1_5_0[i], &s[1],
185 strlen(obsolete_jvm_flags_1_5_0[i])) == 0))) {
186 return true;
187 }
188 i++;
189 }
190 return false;
191 }
193 // Constructs the system class path (aka boot class path) from the following
194 // components, in order:
195 //
196 // prefix // from -Xbootclasspath/p:...
197 // endorsed // the expansion of -Djava.endorsed.dirs=...
198 // base // from os::get_system_properties() or -Xbootclasspath=
199 // suffix // from -Xbootclasspath/a:...
200 //
201 // java.endorsed.dirs is a list of directories; any jar or zip files in the
202 // directories are added to the sysclasspath just before the base.
203 //
204 // This could be AllStatic, but it isn't needed after argument processing is
205 // complete.
206 class SysClassPath: public StackObj {
207 public:
208 SysClassPath(const char* base);
209 ~SysClassPath();
211 inline void set_base(const char* base);
212 inline void add_prefix(const char* prefix);
213 inline void add_suffix(const char* suffix);
214 inline void reset_path(const char* base);
216 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
217 // property. Must be called after all command-line arguments have been
218 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
219 // combined_path().
220 void expand_endorsed();
222 inline const char* get_base() const { return _items[_scp_base]; }
223 inline const char* get_prefix() const { return _items[_scp_prefix]; }
224 inline const char* get_suffix() const { return _items[_scp_suffix]; }
225 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
227 // Combine all the components into a single c-heap-allocated string; caller
228 // must free the string if/when no longer needed.
229 char* combined_path();
231 private:
232 // Utility routines.
233 static char* add_to_path(const char* path, const char* str, bool prepend);
234 static char* add_jars_to_path(char* path, const char* directory);
236 inline void reset_item_at(int index);
238 // Array indices for the items that make up the sysclasspath. All except the
239 // base are allocated in the C heap and freed by this class.
240 enum {
241 _scp_prefix, // from -Xbootclasspath/p:...
242 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
243 _scp_base, // the default sysclasspath
244 _scp_suffix, // from -Xbootclasspath/a:...
245 _scp_nitems // the number of items, must be last.
246 };
248 const char* _items[_scp_nitems];
249 DEBUG_ONLY(bool _expansion_done;)
250 };
252 SysClassPath::SysClassPath(const char* base) {
253 memset(_items, 0, sizeof(_items));
254 _items[_scp_base] = base;
255 DEBUG_ONLY(_expansion_done = false;)
256 }
258 SysClassPath::~SysClassPath() {
259 // Free everything except the base.
260 for (int i = 0; i < _scp_nitems; ++i) {
261 if (i != _scp_base) reset_item_at(i);
262 }
263 DEBUG_ONLY(_expansion_done = false;)
264 }
266 inline void SysClassPath::set_base(const char* base) {
267 _items[_scp_base] = base;
268 }
270 inline void SysClassPath::add_prefix(const char* prefix) {
271 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
272 }
274 inline void SysClassPath::add_suffix(const char* suffix) {
275 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
276 }
278 inline void SysClassPath::reset_item_at(int index) {
279 assert(index < _scp_nitems && index != _scp_base, "just checking");
280 if (_items[index] != NULL) {
281 FREE_C_HEAP_ARRAY(char, _items[index]);
282 _items[index] = NULL;
283 }
284 }
286 inline void SysClassPath::reset_path(const char* base) {
287 // Clear the prefix and suffix.
288 reset_item_at(_scp_prefix);
289 reset_item_at(_scp_suffix);
290 set_base(base);
291 }
293 //------------------------------------------------------------------------------
295 void SysClassPath::expand_endorsed() {
296 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
298 const char* path = Arguments::get_property("java.endorsed.dirs");
299 if (path == NULL) {
300 path = Arguments::get_endorsed_dir();
301 assert(path != NULL, "no default for java.endorsed.dirs");
302 }
304 char* expanded_path = NULL;
305 const char separator = *os::path_separator();
306 const char* const end = path + strlen(path);
307 while (path < end) {
308 const char* tmp_end = strchr(path, separator);
309 if (tmp_end == NULL) {
310 expanded_path = add_jars_to_path(expanded_path, path);
311 path = end;
312 } else {
313 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
314 memcpy(dirpath, path, tmp_end - path);
315 dirpath[tmp_end - path] = '\0';
316 expanded_path = add_jars_to_path(expanded_path, dirpath);
317 FREE_C_HEAP_ARRAY(char, dirpath);
318 path = tmp_end + 1;
319 }
320 }
321 _items[_scp_endorsed] = expanded_path;
322 DEBUG_ONLY(_expansion_done = true;)
323 }
325 // Combine the bootclasspath elements, some of which may be null, into a single
326 // c-heap-allocated string.
327 char* SysClassPath::combined_path() {
328 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
329 assert(_expansion_done, "must call expand_endorsed() first.");
331 size_t lengths[_scp_nitems];
332 size_t total_len = 0;
334 const char separator = *os::path_separator();
336 // Get the lengths.
337 int i;
338 for (i = 0; i < _scp_nitems; ++i) {
339 if (_items[i] != NULL) {
340 lengths[i] = strlen(_items[i]);
341 // Include space for the separator char (or a NULL for the last item).
342 total_len += lengths[i] + 1;
343 }
344 }
345 assert(total_len > 0, "empty sysclasspath not allowed");
347 // Copy the _items to a single string.
348 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
349 char* cp_tmp = cp;
350 for (i = 0; i < _scp_nitems; ++i) {
351 if (_items[i] != NULL) {
352 memcpy(cp_tmp, _items[i], lengths[i]);
353 cp_tmp += lengths[i];
354 *cp_tmp++ = separator;
355 }
356 }
357 *--cp_tmp = '\0'; // Replace the extra separator.
358 return cp;
359 }
361 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
362 char*
363 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
364 char *cp;
366 assert(str != NULL, "just checking");
367 if (path == NULL) {
368 size_t len = strlen(str) + 1;
369 cp = NEW_C_HEAP_ARRAY(char, len);
370 memcpy(cp, str, len); // copy the trailing null
371 } else {
372 const char separator = *os::path_separator();
373 size_t old_len = strlen(path);
374 size_t str_len = strlen(str);
375 size_t len = old_len + str_len + 2;
377 if (prepend) {
378 cp = NEW_C_HEAP_ARRAY(char, len);
379 char* cp_tmp = cp;
380 memcpy(cp_tmp, str, str_len);
381 cp_tmp += str_len;
382 *cp_tmp = separator;
383 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
384 FREE_C_HEAP_ARRAY(char, path);
385 } else {
386 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
387 char* cp_tmp = cp + old_len;
388 *cp_tmp = separator;
389 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
390 }
391 }
392 return cp;
393 }
395 // Scan the directory and append any jar or zip files found to path.
396 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
397 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
398 DIR* dir = os::opendir(directory);
399 if (dir == NULL) return path;
401 char dir_sep[2] = { '\0', '\0' };
402 size_t directory_len = strlen(directory);
403 const char fileSep = *os::file_separator();
404 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
406 /* Scan the directory for jars/zips, appending them to path. */
407 struct dirent *entry;
408 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
409 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
410 const char* name = entry->d_name;
411 const char* ext = name + strlen(name) - 4;
412 bool isJarOrZip = ext > name &&
413 (os::file_name_strcmp(ext, ".jar") == 0 ||
414 os::file_name_strcmp(ext, ".zip") == 0);
415 if (isJarOrZip) {
416 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
417 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
418 path = add_to_path(path, jarpath, false);
419 FREE_C_HEAP_ARRAY(char, jarpath);
420 }
421 }
422 FREE_C_HEAP_ARRAY(char, dbuf);
423 os::closedir(dir);
424 return path;
425 }
427 // Parses a memory size specification string.
428 static bool atomll(const char *s, jlong* result) {
429 jlong n = 0;
430 int args_read = sscanf(s, os::jlong_format_specifier(), &n);
431 if (args_read != 1) {
432 return false;
433 }
434 while (*s != '\0' && isdigit(*s)) {
435 s++;
436 }
437 // 4705540: illegal if more characters are found after the first non-digit
438 if (strlen(s) > 1) {
439 return false;
440 }
441 switch (*s) {
442 case 'T': case 't':
443 *result = n * G * K;
444 return true;
445 case 'G': case 'g':
446 *result = n * G;
447 return true;
448 case 'M': case 'm':
449 *result = n * M;
450 return true;
451 case 'K': case 'k':
452 *result = n * K;
453 return true;
454 case '\0':
455 *result = n;
456 return true;
457 default:
458 return false;
459 }
460 }
462 Arguments::ArgsRange Arguments::check_memory_size(jlong size, jlong min_size) {
463 if (size < min_size) return arg_too_small;
464 // Check that size will fit in a size_t (only relevant on 32-bit)
465 if ((julong) size > max_uintx) return arg_too_big;
466 return arg_in_range;
467 }
469 // Describe an argument out of range error
470 void Arguments::describe_range_error(ArgsRange errcode) {
471 switch(errcode) {
472 case arg_too_big:
473 jio_fprintf(defaultStream::error_stream(),
474 "The specified size exceeds the maximum "
475 "representable size.\n");
476 break;
477 case arg_too_small:
478 case arg_unreadable:
479 case arg_in_range:
480 // do nothing for now
481 break;
482 default:
483 ShouldNotReachHere();
484 }
485 }
487 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
488 return CommandLineFlags::boolAtPut(name, &value, origin);
489 }
492 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
493 double v;
494 if (sscanf(value, "%lf", &v) != 1) {
495 return false;
496 }
498 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
499 return true;
500 }
501 return false;
502 }
505 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
506 jlong v;
507 intx intx_v;
508 bool is_neg = false;
509 // Check the sign first since atomll() parses only unsigned values.
510 if (*value == '-') {
511 if (!CommandLineFlags::intxAt(name, &intx_v)) {
512 return false;
513 }
514 value++;
515 is_neg = true;
516 }
517 if (!atomll(value, &v)) {
518 return false;
519 }
520 intx_v = (intx) v;
521 if (is_neg) {
522 intx_v = -intx_v;
523 }
524 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
525 return true;
526 }
527 uintx uintx_v = (uintx) v;
528 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
529 return true;
530 }
531 return false;
532 }
535 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
536 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
537 // Contract: CommandLineFlags always returns a pointer that needs freeing.
538 FREE_C_HEAP_ARRAY(char, value);
539 return true;
540 }
542 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
543 const char* old_value = "";
544 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
545 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
546 size_t new_len = strlen(new_value);
547 const char* value;
548 char* free_this_too = NULL;
549 if (old_len == 0) {
550 value = new_value;
551 } else if (new_len == 0) {
552 value = old_value;
553 } else {
554 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
555 // each new setting adds another LINE to the switch:
556 sprintf(buf, "%s\n%s", old_value, new_value);
557 value = buf;
558 free_this_too = buf;
559 }
560 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
561 // CommandLineFlags always returns a pointer that needs freeing.
562 FREE_C_HEAP_ARRAY(char, value);
563 if (free_this_too != NULL) {
564 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
565 FREE_C_HEAP_ARRAY(char, free_this_too);
566 }
567 return true;
568 }
571 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
573 // range of acceptable characters spelled out for portability reasons
574 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
575 #define BUFLEN 255
576 char name[BUFLEN+1];
577 char dummy;
579 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
580 return set_bool_flag(name, false, origin);
581 }
582 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
583 return set_bool_flag(name, true, origin);
584 }
586 char punct;
587 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
588 const char* value = strchr(arg, '=') + 1;
589 Flag* flag = Flag::find_flag(name, strlen(name));
590 if (flag != NULL && flag->is_ccstr()) {
591 if (flag->ccstr_accumulates()) {
592 return append_to_string_flag(name, value, origin);
593 } else {
594 if (value[0] == '\0') {
595 value = NULL;
596 }
597 return set_string_flag(name, value, origin);
598 }
599 }
600 }
602 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
603 const char* value = strchr(arg, '=') + 1;
604 // -XX:Foo:=xxx will reset the string flag to the given value.
605 if (value[0] == '\0') {
606 value = NULL;
607 }
608 return set_string_flag(name, value, origin);
609 }
611 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
612 #define SIGNED_NUMBER_RANGE "[-0123456789]"
613 #define NUMBER_RANGE "[0123456789]"
614 char value[BUFLEN + 1];
615 char value2[BUFLEN + 1];
616 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
617 // Looks like a floating-point number -- try again with more lenient format string
618 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
619 return set_fp_numeric_flag(name, value, origin);
620 }
621 }
623 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
624 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
625 return set_numeric_flag(name, value, origin);
626 }
628 return false;
629 }
632 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
633 assert(bldarray != NULL, "illegal argument");
635 if (arg == NULL) {
636 return;
637 }
639 int index = *count;
641 // expand the array and add arg to the last element
642 (*count)++;
643 if (*bldarray == NULL) {
644 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
645 } else {
646 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
647 }
648 (*bldarray)[index] = strdup(arg);
649 }
651 void Arguments::build_jvm_args(const char* arg) {
652 add_string(&_jvm_args_array, &_num_jvm_args, arg);
653 }
655 void Arguments::build_jvm_flags(const char* arg) {
656 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
657 }
659 // utility function to return a string that concatenates all
660 // strings in a given char** array
661 const char* Arguments::build_resource_string(char** args, int count) {
662 if (args == NULL || count == 0) {
663 return NULL;
664 }
665 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
666 for (int i = 1; i < count; i++) {
667 length += strlen(args[i]) + 1; // add 1 for a space
668 }
669 char* s = NEW_RESOURCE_ARRAY(char, length);
670 strcpy(s, args[0]);
671 for (int j = 1; j < count; j++) {
672 strcat(s, " ");
673 strcat(s, args[j]);
674 }
675 return (const char*) s;
676 }
678 void Arguments::print_on(outputStream* st) {
679 st->print_cr("VM Arguments:");
680 if (num_jvm_flags() > 0) {
681 st->print("jvm_flags: "); print_jvm_flags_on(st);
682 }
683 if (num_jvm_args() > 0) {
684 st->print("jvm_args: "); print_jvm_args_on(st);
685 }
686 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
687 st->print_cr("Launcher Type: %s", _sun_java_launcher);
688 }
690 void Arguments::print_jvm_flags_on(outputStream* st) {
691 if (_num_jvm_flags > 0) {
692 for (int i=0; i < _num_jvm_flags; i++) {
693 st->print("%s ", _jvm_flags_array[i]);
694 }
695 st->print_cr("");
696 }
697 }
699 void Arguments::print_jvm_args_on(outputStream* st) {
700 if (_num_jvm_args > 0) {
701 for (int i=0; i < _num_jvm_args; i++) {
702 st->print("%s ", _jvm_args_array[i]);
703 }
704 st->print_cr("");
705 }
706 }
708 bool Arguments::process_argument(const char* arg, jboolean ignore_unrecognized, FlagValueOrigin origin) {
710 if (parse_argument(arg, origin)) {
711 // do nothing
712 } else if (made_obsolete_in_1_5_0(arg)) {
713 jio_fprintf(defaultStream::error_stream(),
714 "Warning: The flag %s has been EOL'd as of 1.5.0 and will"
715 " be ignored\n", arg);
716 } else {
717 if (!ignore_unrecognized) {
718 jio_fprintf(defaultStream::error_stream(),
719 "Unrecognized VM option '%s'\n", arg);
720 // allow for commandline "commenting out" options like -XX:#+Verbose
721 if (strlen(arg) == 0 || arg[0] != '#') {
722 return false;
723 }
724 }
725 }
726 return true;
727 }
730 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
731 FILE* stream = fopen(file_name, "rb");
732 if (stream == NULL) {
733 if (should_exist) {
734 jio_fprintf(defaultStream::error_stream(),
735 "Could not open settings file %s\n", file_name);
736 return false;
737 } else {
738 return true;
739 }
740 }
742 char token[1024];
743 int pos = 0;
745 bool in_white_space = true;
746 bool in_comment = false;
747 bool in_quote = false;
748 char quote_c = 0;
749 bool result = true;
751 int c = getc(stream);
752 while(c != EOF) {
753 if (in_white_space) {
754 if (in_comment) {
755 if (c == '\n') in_comment = false;
756 } else {
757 if (c == '#') in_comment = true;
758 else if (!isspace(c)) {
759 in_white_space = false;
760 token[pos++] = c;
761 }
762 }
763 } else {
764 if (c == '\n' || (!in_quote && isspace(c))) {
765 // token ends at newline, or at unquoted whitespace
766 // this allows a way to include spaces in string-valued options
767 token[pos] = '\0';
768 logOption(token);
769 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
770 build_jvm_flags(token);
771 pos = 0;
772 in_white_space = true;
773 in_quote = false;
774 } else if (!in_quote && (c == '\'' || c == '"')) {
775 in_quote = true;
776 quote_c = c;
777 } else if (in_quote && (c == quote_c)) {
778 in_quote = false;
779 } else {
780 token[pos++] = c;
781 }
782 }
783 c = getc(stream);
784 }
785 if (pos > 0) {
786 token[pos] = '\0';
787 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
788 build_jvm_flags(token);
789 }
790 fclose(stream);
791 return result;
792 }
794 //=============================================================================================================
795 // Parsing of properties (-D)
797 const char* Arguments::get_property(const char* key) {
798 return PropertyList_get_value(system_properties(), key);
799 }
801 bool Arguments::add_property(const char* prop) {
802 const char* eq = strchr(prop, '=');
803 char* key;
804 // ns must be static--its address may be stored in a SystemProperty object.
805 const static char ns[1] = {0};
806 char* value = (char *)ns;
808 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
809 key = AllocateHeap(key_len + 1, "add_property");
810 strncpy(key, prop, key_len);
811 key[key_len] = '\0';
813 if (eq != NULL) {
814 size_t value_len = strlen(prop) - key_len - 1;
815 value = AllocateHeap(value_len + 1, "add_property");
816 strncpy(value, &prop[key_len + 1], value_len + 1);
817 }
819 if (strcmp(key, "java.compiler") == 0) {
820 process_java_compiler_argument(value);
821 FreeHeap(key);
822 if (eq != NULL) {
823 FreeHeap(value);
824 }
825 return true;
826 }
827 else if (strcmp(key, "sun.java.command") == 0) {
829 _java_command = value;
831 // don't add this property to the properties exposed to the java application
832 FreeHeap(key);
833 return true;
834 }
835 else if (strcmp(key, "sun.java.launcher.pid") == 0) {
836 // launcher.pid property is private and is processed
837 // in process_sun_java_launcher_properties();
838 // the sun.java.launcher property is passed on to the java application
839 FreeHeap(key);
840 if (eq != NULL) {
841 FreeHeap(value);
842 }
843 return true;
844 }
845 else if (strcmp(key, "java.vendor.url.bug") == 0) {
846 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
847 // its value without going through the property list or making a Java call.
848 _java_vendor_url_bug = value;
849 }
851 // Create new property and add at the end of the list
852 PropertyList_unique_add(&_system_properties, key, value);
853 return true;
854 }
856 //===========================================================================================================
857 // Setting int/mixed/comp mode flags
859 void Arguments::set_mode_flags(Mode mode) {
860 // Set up default values for all flags.
861 // If you add a flag to any of the branches below,
862 // add a default value for it here.
863 set_java_compiler(false);
864 _mode = mode;
866 // Ensure Agent_OnLoad has the correct initial values.
867 // This may not be the final mode; mode may change later in onload phase.
868 PropertyList_unique_add(&_system_properties, "java.vm.info",
869 (char*)Abstract_VM_Version::vm_info_string());
871 UseInterpreter = true;
872 UseCompiler = true;
873 UseLoopCounter = true;
875 // Default values may be platform/compiler dependent -
876 // use the saved values
877 ClipInlining = Arguments::_ClipInlining;
878 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
879 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
880 BackgroundCompilation = Arguments::_BackgroundCompilation;
881 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
883 // Change from defaults based on mode
884 switch (mode) {
885 default:
886 ShouldNotReachHere();
887 break;
888 case _int:
889 UseCompiler = false;
890 UseLoopCounter = false;
891 AlwaysCompileLoopMethods = false;
892 UseOnStackReplacement = false;
893 break;
894 case _mixed:
895 // same as default
896 break;
897 case _comp:
898 UseInterpreter = false;
899 BackgroundCompilation = false;
900 ClipInlining = false;
901 break;
902 }
903 }
906 // Conflict: required to use shared spaces (-Xshare:on), but
907 // incompatible command line options were chosen.
909 static void no_shared_spaces() {
910 if (RequireSharedSpaces) {
911 jio_fprintf(defaultStream::error_stream(),
912 "Class data sharing is inconsistent with other specified options.\n");
913 vm_exit_during_initialization("Unable to use shared archive.", NULL);
914 } else {
915 FLAG_SET_DEFAULT(UseSharedSpaces, false);
916 }
917 }
920 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
921 // if it's not explictly set or unset. If the user has chosen
922 // UseParNewGC and not explicitly set ParallelGCThreads we
923 // set it, unless this is a single cpu machine.
924 void Arguments::set_parnew_gc_flags() {
925 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
926 "control point invariant");
927 assert(UseParNewGC, "Error");
929 // Turn off AdaptiveSizePolicy by default for parnew until it is
930 // complete.
931 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
932 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
933 }
935 if (ParallelGCThreads == 0) {
936 FLAG_SET_DEFAULT(ParallelGCThreads,
937 Abstract_VM_Version::parallel_worker_threads());
938 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
939 FLAG_SET_DEFAULT(UseParNewGC, false);
940 }
941 }
942 if (!UseParNewGC) {
943 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
944 } else {
945 no_shared_spaces();
947 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
948 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
949 // we set them to 1024 and 1024.
950 // See CR 6362902.
951 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
952 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
953 }
954 if (FLAG_IS_DEFAULT(OldPLABSize)) {
955 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
956 }
958 // AlwaysTenure flag should make ParNew to promote all at first collection.
959 // See CR 6362902.
960 if (AlwaysTenure) {
961 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
962 }
963 }
964 }
966 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
967 // sparc/solaris for certain applications, but would gain from
968 // further optimization and tuning efforts, and would almost
969 // certainly gain from analysis of platform and environment.
970 void Arguments::set_cms_and_parnew_gc_flags() {
971 assert(!UseSerialGC && !UseParallelGC, "Error");
972 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
974 // If we are using CMS, we prefer to UseParNewGC,
975 // unless explicitly forbidden.
976 if (FLAG_IS_DEFAULT(UseParNewGC)) {
977 FLAG_SET_ERGO(bool, UseParNewGC, true);
978 }
980 // Turn off AdaptiveSizePolicy by default for cms until it is
981 // complete.
982 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
983 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
984 }
986 // In either case, adjust ParallelGCThreads and/or UseParNewGC
987 // as needed.
988 if (UseParNewGC) {
989 set_parnew_gc_flags();
990 }
992 // Now make adjustments for CMS
993 size_t young_gen_per_worker;
994 intx new_ratio;
995 size_t min_new_default;
996 intx tenuring_default;
997 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
998 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
999 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1000 }
1001 young_gen_per_worker = 4*M;
1002 new_ratio = (intx)15;
1003 min_new_default = 4*M;
1004 tenuring_default = (intx)0;
1005 } else { // new defaults: "new" as of 6.0
1006 young_gen_per_worker = CMSYoungGenPerWorker;
1007 new_ratio = (intx)7;
1008 min_new_default = 16*M;
1009 tenuring_default = (intx)4;
1010 }
1012 // Preferred young gen size for "short" pauses
1013 const uintx parallel_gc_threads =
1014 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1015 const size_t preferred_max_new_size_unaligned =
1016 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1017 const size_t preferred_max_new_size =
1018 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1020 // Unless explicitly requested otherwise, size young gen
1021 // for "short" pauses ~ 4M*ParallelGCThreads
1022 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1023 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1024 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1025 } else {
1026 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1027 }
1028 if(PrintGCDetails && Verbose) {
1029 // Too early to use gclog_or_tty
1030 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1031 }
1032 }
1033 // Unless explicitly requested otherwise, prefer a large
1034 // Old to Young gen size so as to shift the collection load
1035 // to the old generation concurrent collector
1036 if (FLAG_IS_DEFAULT(NewRatio)) {
1037 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1039 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1040 size_t prev_initial_size = initial_heap_size();
1041 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1042 set_initial_heap_size(min_new+OldSize);
1043 // Currently minimum size and the initial heap sizes are the same.
1044 set_min_heap_size(initial_heap_size());
1045 if (PrintGCDetails && Verbose) {
1046 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1047 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1048 initial_heap_size()/M, prev_initial_size/M);
1049 }
1050 }
1051 // MaxHeapSize is aligned down in collectorPolicy
1052 size_t max_heap = align_size_down(MaxHeapSize,
1053 CardTableRS::ct_max_alignment_constraint());
1055 if(PrintGCDetails && Verbose) {
1056 // Too early to use gclog_or_tty
1057 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1058 " initial_heap_size: " SIZE_FORMAT
1059 " max_heap: " SIZE_FORMAT,
1060 min_heap_size(), initial_heap_size(), max_heap);
1061 }
1062 if (max_heap > min_new) {
1063 // Unless explicitly requested otherwise, make young gen
1064 // at least min_new, and at most preferred_max_new_size.
1065 if (FLAG_IS_DEFAULT(NewSize)) {
1066 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1067 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1068 if(PrintGCDetails && Verbose) {
1069 // Too early to use gclog_or_tty
1070 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1071 }
1072 }
1073 // Unless explicitly requested otherwise, size old gen
1074 // so that it's at least 3X of NewSize to begin with;
1075 // later NewRatio will decide how it grows; see above.
1076 if (FLAG_IS_DEFAULT(OldSize)) {
1077 if (max_heap > NewSize) {
1078 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1079 if(PrintGCDetails && Verbose) {
1080 // Too early to use gclog_or_tty
1081 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1082 }
1083 }
1084 }
1085 }
1086 }
1087 // Unless explicitly requested otherwise, definitely
1088 // promote all objects surviving "tenuring_default" scavenges.
1089 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1090 FLAG_IS_DEFAULT(SurvivorRatio)) {
1091 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1092 }
1093 // If we decided above (or user explicitly requested)
1094 // `promote all' (via MaxTenuringThreshold := 0),
1095 // prefer minuscule survivor spaces so as not to waste
1096 // space for (non-existent) survivors
1097 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1098 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1099 }
1100 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1101 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1102 // This is done in order to make ParNew+CMS configuration to work
1103 // with YoungPLABSize and OldPLABSize options.
1104 // See CR 6362902.
1105 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1106 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1107 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1108 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1109 // the value (either from the command line or ergonomics) of
1110 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1111 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1112 }
1113 else {
1114 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1115 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1116 // we'll let it to take precedence.
1117 jio_fprintf(defaultStream::error_stream(),
1118 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1119 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1120 }
1121 }
1122 }
1124 inline uintx max_heap_for_compressed_oops() {
1125 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1126 NOT_LP64(return DefaultMaxRAM);
1127 }
1129 bool Arguments::should_auto_select_low_pause_collector() {
1130 if (UseAutoGCSelectPolicy &&
1131 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1132 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1133 if (PrintGCDetails) {
1134 // Cannot use gclog_or_tty yet.
1135 tty->print_cr("Automatic selection of the low pause collector"
1136 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1137 }
1138 return true;
1139 }
1140 return false;
1141 }
1143 void Arguments::set_ergonomics_flags() {
1144 // Parallel GC is not compatible with sharing. If one specifies
1145 // that they want sharing explicitly, do not set ergonmics flags.
1146 if (DumpSharedSpaces || ForceSharedSpaces) {
1147 return;
1148 }
1150 if (os::is_server_class_machine() && !force_client_mode ) {
1151 // If no other collector is requested explicitly,
1152 // let the VM select the collector based on
1153 // machine class and automatic selection policy.
1154 if (!UseSerialGC &&
1155 !UseConcMarkSweepGC &&
1156 !UseG1GC &&
1157 !UseParNewGC &&
1158 !DumpSharedSpaces &&
1159 FLAG_IS_DEFAULT(UseParallelGC)) {
1160 if (should_auto_select_low_pause_collector()) {
1161 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1162 } else {
1163 FLAG_SET_ERGO(bool, UseParallelGC, true);
1164 }
1165 no_shared_spaces();
1166 }
1167 }
1169 #ifdef _LP64
1170 // Compressed Headers do not work with CMS, which uses a bit in the klass
1171 // field offset to determine free list chunk markers.
1172 // Check that UseCompressedOops can be set with the max heap size allocated
1173 // by ergonomics.
1174 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1175 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1176 // Leave compressed oops off by default. Uncomment
1177 // the following line to return it to default status.
1178 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1179 } else if (UseCompressedOops && UseG1GC) {
1180 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
1181 FLAG_SET_DEFAULT(UseCompressedOops, false);
1182 }
1183 } else {
1184 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1185 warning("Max heap size too large for Compressed Oops");
1186 FLAG_SET_DEFAULT(UseCompressedOops, false);
1187 }
1188 }
1189 // Also checks that certain machines are slower with compressed oops
1190 // in vm_version initialization code.
1191 #endif // _LP64
1192 }
1194 void Arguments::set_parallel_gc_flags() {
1195 assert(UseParallelGC || UseParallelOldGC, "Error");
1196 // If parallel old was requested, automatically enable parallel scavenge.
1197 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1198 FLAG_SET_DEFAULT(UseParallelGC, true);
1199 }
1201 // If no heap maximum was requested explicitly, use some reasonable fraction
1202 // of the physical memory, up to a maximum of 1GB.
1203 if (UseParallelGC) {
1204 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1205 Abstract_VM_Version::parallel_worker_threads());
1207 // PS is a server collector, setup the heap sizes accordingly.
1208 set_server_heap_size();
1209 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1210 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1211 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1212 // See CR 6362902 for details.
1213 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1214 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1215 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1216 }
1217 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1218 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1219 }
1220 }
1222 if (UseParallelOldGC) {
1223 // Par compact uses lower default values since they are treated as
1224 // minimums. These are different defaults because of the different
1225 // interpretation and are not ergonomically set.
1226 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1227 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1228 }
1229 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1230 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1231 }
1232 }
1233 }
1234 }
1236 void Arguments::set_g1_gc_flags() {
1237 assert(UseG1GC, "Error");
1238 // G1 is a server collector, setup the heap sizes accordingly.
1239 set_server_heap_size();
1240 #ifdef COMPILER1
1241 FastTLABRefill = false;
1242 #endif
1243 FLAG_SET_DEFAULT(ParallelGCThreads,
1244 Abstract_VM_Version::parallel_worker_threads());
1245 if (ParallelGCThreads == 0) {
1246 FLAG_SET_DEFAULT(ParallelGCThreads,
1247 Abstract_VM_Version::parallel_worker_threads
1248 ());
1249 }
1250 no_shared_spaces();
1251 }
1253 void Arguments::set_server_heap_size() {
1254 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1255 const uint64_t reasonable_fraction =
1256 os::physical_memory() / DefaultMaxRAMFraction;
1257 const uint64_t maximum_size = (uint64_t)
1258 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1259 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1260 DefaultMaxRAM);
1261 size_t reasonable_max =
1262 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1263 if (reasonable_max > maximum_size) {
1264 reasonable_max = maximum_size;
1265 }
1266 if (PrintGCDetails && Verbose) {
1267 // Cannot use gclog_or_tty yet.
1268 tty->print_cr(" Max heap size for server class platform "
1269 SIZE_FORMAT, reasonable_max);
1270 }
1271 // If the initial_heap_size has not been set with -Xms,
1272 // then set it as fraction of size of physical memory
1273 // respecting the maximum and minimum sizes of the heap.
1274 if (initial_heap_size() == 0) {
1275 const uint64_t reasonable_initial_fraction =
1276 os::physical_memory() / DefaultInitialRAMFraction;
1277 const size_t reasonable_initial =
1278 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1279 const size_t minimum_size = NewSize + OldSize;
1280 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1281 minimum_size));
1282 // Currently the minimum size and the initial heap sizes are the same.
1283 set_min_heap_size(initial_heap_size());
1284 if (PrintGCDetails && Verbose) {
1285 // Cannot use gclog_or_tty yet.
1286 tty->print_cr(" Initial heap size for server class platform "
1287 SIZE_FORMAT, initial_heap_size());
1288 }
1289 } else {
1290 // A minimum size was specified on the command line. Be sure
1291 // that the maximum size is consistent.
1292 if (initial_heap_size() > reasonable_max) {
1293 reasonable_max = initial_heap_size();
1294 }
1295 }
1296 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1297 }
1298 }
1300 // This must be called after ergonomics because we want bytecode rewriting
1301 // if the server compiler is used, or if UseSharedSpaces is disabled.
1302 void Arguments::set_bytecode_flags() {
1303 // Better not attempt to store into a read-only space.
1304 if (UseSharedSpaces) {
1305 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1306 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1307 }
1309 if (!RewriteBytecodes) {
1310 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1311 }
1312 }
1314 // Aggressive optimization flags -XX:+AggressiveOpts
1315 void Arguments::set_aggressive_opts_flags() {
1316 #ifdef COMPILER2
1317 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1318 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1319 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1320 }
1321 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1322 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1323 }
1325 // Feed the cache size setting into the JDK
1326 char buffer[1024];
1327 sprintf(buffer, "java.lang.Integer.IntegerCache.high=%d", AutoBoxCacheMax);
1328 add_property(buffer);
1329 }
1330 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1331 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1332 }
1333 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) {
1334 FLAG_SET_DEFAULT(SpecialArraysEquals, true);
1335 }
1336 #endif
1338 if (AggressiveOpts) {
1339 // Sample flag setting code
1340 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1341 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1342 // }
1343 }
1344 }
1346 //===========================================================================================================
1347 // Parsing of java.compiler property
1349 void Arguments::process_java_compiler_argument(char* arg) {
1350 // For backwards compatibility, Djava.compiler=NONE or ""
1351 // causes us to switch to -Xint mode UNLESS -Xdebug
1352 // is also specified.
1353 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1354 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1355 }
1356 }
1358 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1359 _sun_java_launcher = strdup(launcher);
1360 }
1362 bool Arguments::created_by_java_launcher() {
1363 assert(_sun_java_launcher != NULL, "property must have value");
1364 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1365 }
1367 //===========================================================================================================
1368 // Parsing of main arguments
1370 bool Arguments::verify_percentage(uintx value, const char* name) {
1371 if (value <= 100) {
1372 return true;
1373 }
1374 jio_fprintf(defaultStream::error_stream(),
1375 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1376 name, value);
1377 return false;
1378 }
1380 static void set_serial_gc_flags() {
1381 FLAG_SET_DEFAULT(UseSerialGC, true);
1382 FLAG_SET_DEFAULT(UseParNewGC, false);
1383 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1384 FLAG_SET_DEFAULT(UseParallelGC, false);
1385 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1386 FLAG_SET_DEFAULT(UseG1GC, false);
1387 }
1389 static bool verify_serial_gc_flags() {
1390 return (UseSerialGC &&
1391 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC ||
1392 UseParallelGC || UseParallelOldGC));
1393 }
1395 // Check consistency of GC selection
1396 bool Arguments::check_gc_consistency() {
1397 bool status = true;
1398 // Ensure that the user has not selected conflicting sets
1399 // of collectors. [Note: this check is merely a user convenience;
1400 // collectors over-ride each other so that only a non-conflicting
1401 // set is selected; however what the user gets is not what they
1402 // may have expected from the combination they asked for. It's
1403 // better to reduce user confusion by not allowing them to
1404 // select conflicting combinations.
1405 uint i = 0;
1406 if (UseSerialGC) i++;
1407 if (UseConcMarkSweepGC || UseParNewGC) i++;
1408 if (UseParallelGC || UseParallelOldGC) i++;
1409 if (i > 1) {
1410 jio_fprintf(defaultStream::error_stream(),
1411 "Conflicting collector combinations in option list; "
1412 "please refer to the release notes for the combinations "
1413 "allowed\n");
1414 status = false;
1415 }
1417 return status;
1418 }
1420 // Check the consistency of vm_init_args
1421 bool Arguments::check_vm_args_consistency() {
1422 // Method for adding checks for flag consistency.
1423 // The intent is to warn the user of all possible conflicts,
1424 // before returning an error.
1425 // Note: Needs platform-dependent factoring.
1426 bool status = true;
1428 #if ( (defined(COMPILER2) && defined(SPARC)))
1429 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1430 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1431 // x86. Normally, VM_Version_init must be called from init_globals in
1432 // init.cpp, which is called by the initial java thread *after* arguments
1433 // have been parsed. VM_Version_init gets called twice on sparc.
1434 extern void VM_Version_init();
1435 VM_Version_init();
1436 if (!VM_Version::has_v9()) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "V8 Machine detected, Server requires V9\n");
1439 status = false;
1440 }
1441 #endif /* COMPILER2 && SPARC */
1443 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1444 // builds so the cost of stack banging can be measured.
1445 #if (defined(PRODUCT) && defined(SOLARIS))
1446 if (!UseBoundThreads && !UseStackBanging) {
1447 jio_fprintf(defaultStream::error_stream(),
1448 "-UseStackBanging conflicts with -UseBoundThreads\n");
1450 status = false;
1451 }
1452 #endif
1454 if (TLABRefillWasteFraction == 0) {
1455 jio_fprintf(defaultStream::error_stream(),
1456 "TLABRefillWasteFraction should be a denominator, "
1457 "not " SIZE_FORMAT "\n",
1458 TLABRefillWasteFraction);
1459 status = false;
1460 }
1462 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1463 "MaxLiveObjectEvacuationRatio");
1464 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1465 "AdaptiveSizePolicyWeight");
1466 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1467 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1468 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1469 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1471 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1472 jio_fprintf(defaultStream::error_stream(),
1473 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1474 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1475 MinHeapFreeRatio, MaxHeapFreeRatio);
1476 status = false;
1477 }
1478 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1479 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1481 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1482 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1483 }
1485 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1486 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1487 if (GCTimeLimit == 100) {
1488 // Turn off gc-overhead-limit-exceeded checks
1489 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1490 }
1492 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1494 // Check user specified sharing option conflict with Parallel GC
1495 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC ||
1496 UseParallelGC || UseParallelOldGC ||
1497 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1499 if (cannot_share) {
1500 // Either force sharing on by forcing the other options off, or
1501 // force sharing off.
1502 if (DumpSharedSpaces || ForceSharedSpaces) {
1503 set_serial_gc_flags();
1504 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1505 } else {
1506 no_shared_spaces();
1507 }
1508 }
1510 status = status && check_gc_consistency();
1512 if (_has_alloc_profile) {
1513 if (UseParallelGC || UseParallelOldGC) {
1514 jio_fprintf(defaultStream::error_stream(),
1515 "error: invalid argument combination.\n"
1516 "Allocation profiling (-Xaprof) cannot be used together with "
1517 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1518 status = false;
1519 }
1520 if (UseConcMarkSweepGC) {
1521 jio_fprintf(defaultStream::error_stream(),
1522 "error: invalid argument combination.\n"
1523 "Allocation profiling (-Xaprof) cannot be used together with "
1524 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1525 status = false;
1526 }
1527 }
1529 if (CMSIncrementalMode) {
1530 if (!UseConcMarkSweepGC) {
1531 jio_fprintf(defaultStream::error_stream(),
1532 "error: invalid argument combination.\n"
1533 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1534 "selected in order\nto use CMSIncrementalMode.\n");
1535 status = false;
1536 } else {
1537 status = status && verify_percentage(CMSIncrementalDutyCycle,
1538 "CMSIncrementalDutyCycle");
1539 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1540 "CMSIncrementalDutyCycleMin");
1541 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1542 "CMSIncrementalSafetyFactor");
1543 status = status && verify_percentage(CMSIncrementalOffset,
1544 "CMSIncrementalOffset");
1545 status = status && verify_percentage(CMSExpAvgFactor,
1546 "CMSExpAvgFactor");
1547 // If it was not set on the command line, set
1548 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1549 if (CMSInitiatingOccupancyFraction < 0) {
1550 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1551 }
1552 }
1553 }
1555 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1556 // insists that we hold the requisite locks so that the iteration is
1557 // MT-safe. For the verification at start-up and shut-down, we don't
1558 // yet have a good way of acquiring and releasing these locks,
1559 // which are not visible at the CollectedHeap level. We want to
1560 // be able to acquire these locks and then do the iteration rather
1561 // than just disable the lock verification. This will be fixed under
1562 // bug 4788986.
1563 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1564 if (VerifyGCStartAt == 0) {
1565 warning("Heap verification at start-up disabled "
1566 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1567 VerifyGCStartAt = 1; // Disable verification at start-up
1568 }
1569 if (VerifyBeforeExit) {
1570 warning("Heap verification at shutdown disabled "
1571 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1572 VerifyBeforeExit = false; // Disable verification at shutdown
1573 }
1574 }
1576 // Note: only executed in non-PRODUCT mode
1577 if (!UseAsyncConcMarkSweepGC &&
1578 (ExplicitGCInvokesConcurrent ||
1579 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1580 jio_fprintf(defaultStream::error_stream(),
1581 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1582 " with -UseAsyncConcMarkSweepGC");
1583 status = false;
1584 }
1586 return status;
1587 }
1589 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1590 const char* option_type) {
1591 if (ignore) return false;
1593 const char* spacer = " ";
1594 if (option_type == NULL) {
1595 option_type = ++spacer; // Set both to the empty string.
1596 }
1598 if (os::obsolete_option(option)) {
1599 jio_fprintf(defaultStream::error_stream(),
1600 "Obsolete %s%soption: %s\n", option_type, spacer,
1601 option->optionString);
1602 return false;
1603 } else {
1604 jio_fprintf(defaultStream::error_stream(),
1605 "Unrecognized %s%soption: %s\n", option_type, spacer,
1606 option->optionString);
1607 return true;
1608 }
1609 }
1611 static const char* user_assertion_options[] = {
1612 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1613 };
1615 static const char* system_assertion_options[] = {
1616 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1617 };
1619 // Return true if any of the strings in null-terminated array 'names' matches.
1620 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1621 // the option must match exactly.
1622 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1623 bool tail_allowed) {
1624 for (/* empty */; *names != NULL; ++names) {
1625 if (match_option(option, *names, tail)) {
1626 if (**tail == '\0' || tail_allowed && **tail == ':') {
1627 return true;
1628 }
1629 }
1630 }
1631 return false;
1632 }
1634 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1635 jlong* long_arg,
1636 jlong min_size) {
1637 if (!atomll(s, long_arg)) return arg_unreadable;
1638 return check_memory_size(*long_arg, min_size);
1639 }
1641 // Parse JavaVMInitArgs structure
1643 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1644 // For components of the system classpath.
1645 SysClassPath scp(Arguments::get_sysclasspath());
1646 bool scp_assembly_required = false;
1648 // Save default settings for some mode flags
1649 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1650 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1651 Arguments::_ClipInlining = ClipInlining;
1652 Arguments::_BackgroundCompilation = BackgroundCompilation;
1653 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1655 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1656 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1657 if (result != JNI_OK) {
1658 return result;
1659 }
1661 // Parse JavaVMInitArgs structure passed in
1662 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1663 if (result != JNI_OK) {
1664 return result;
1665 }
1667 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1668 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1669 if (result != JNI_OK) {
1670 return result;
1671 }
1673 // Do final processing now that all arguments have been parsed
1674 result = finalize_vm_init_args(&scp, scp_assembly_required);
1675 if (result != JNI_OK) {
1676 return result;
1677 }
1679 return JNI_OK;
1680 }
1683 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1684 SysClassPath* scp_p,
1685 bool* scp_assembly_required_p,
1686 FlagValueOrigin origin) {
1687 // Remaining part of option string
1688 const char* tail;
1690 // iterate over arguments
1691 for (int index = 0; index < args->nOptions; index++) {
1692 bool is_absolute_path = false; // for -agentpath vs -agentlib
1694 const JavaVMOption* option = args->options + index;
1696 if (!match_option(option, "-Djava.class.path", &tail) &&
1697 !match_option(option, "-Dsun.java.command", &tail) &&
1698 !match_option(option, "-Dsun.java.launcher", &tail)) {
1700 // add all jvm options to the jvm_args string. This string
1701 // is used later to set the java.vm.args PerfData string constant.
1702 // the -Djava.class.path and the -Dsun.java.command options are
1703 // omitted from jvm_args string as each have their own PerfData
1704 // string constant object.
1705 build_jvm_args(option->optionString);
1706 }
1708 // -verbose:[class/gc/jni]
1709 if (match_option(option, "-verbose", &tail)) {
1710 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1711 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1712 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1713 } else if (!strcmp(tail, ":gc")) {
1714 FLAG_SET_CMDLINE(bool, PrintGC, true);
1715 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1716 } else if (!strcmp(tail, ":jni")) {
1717 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1718 }
1719 // -da / -ea / -disableassertions / -enableassertions
1720 // These accept an optional class/package name separated by a colon, e.g.,
1721 // -da:java.lang.Thread.
1722 } else if (match_option(option, user_assertion_options, &tail, true)) {
1723 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1724 if (*tail == '\0') {
1725 JavaAssertions::setUserClassDefault(enable);
1726 } else {
1727 assert(*tail == ':', "bogus match by match_option()");
1728 JavaAssertions::addOption(tail + 1, enable);
1729 }
1730 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1731 } else if (match_option(option, system_assertion_options, &tail, false)) {
1732 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1733 JavaAssertions::setSystemClassDefault(enable);
1734 // -bootclasspath:
1735 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1736 scp_p->reset_path(tail);
1737 *scp_assembly_required_p = true;
1738 // -bootclasspath/a:
1739 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1740 scp_p->add_suffix(tail);
1741 *scp_assembly_required_p = true;
1742 // -bootclasspath/p:
1743 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1744 scp_p->add_prefix(tail);
1745 *scp_assembly_required_p = true;
1746 // -Xrun
1747 } else if (match_option(option, "-Xrun", &tail)) {
1748 if(tail != NULL) {
1749 const char* pos = strchr(tail, ':');
1750 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1751 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1752 name[len] = '\0';
1754 char *options = NULL;
1755 if(pos != NULL) {
1756 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1757 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1758 }
1759 #ifdef JVMTI_KERNEL
1760 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1761 warning("profiling and debugging agents are not supported with Kernel VM");
1762 } else
1763 #endif // JVMTI_KERNEL
1764 add_init_library(name, options);
1765 }
1766 // -agentlib and -agentpath
1767 } else if (match_option(option, "-agentlib:", &tail) ||
1768 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1769 if(tail != NULL) {
1770 const char* pos = strchr(tail, '=');
1771 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1772 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1773 name[len] = '\0';
1775 char *options = NULL;
1776 if(pos != NULL) {
1777 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1778 }
1779 #ifdef JVMTI_KERNEL
1780 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1781 warning("profiling and debugging agents are not supported with Kernel VM");
1782 } else
1783 #endif // JVMTI_KERNEL
1784 add_init_agent(name, options, is_absolute_path);
1786 }
1787 // -javaagent
1788 } else if (match_option(option, "-javaagent:", &tail)) {
1789 if(tail != NULL) {
1790 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1791 add_init_agent("instrument", options, false);
1792 }
1793 // -Xnoclassgc
1794 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1795 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1796 // -Xincgc: i-CMS
1797 } else if (match_option(option, "-Xincgc", &tail)) {
1798 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1799 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1800 // -Xnoincgc: no i-CMS
1801 } else if (match_option(option, "-Xnoincgc", &tail)) {
1802 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1803 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1804 // -Xconcgc
1805 } else if (match_option(option, "-Xconcgc", &tail)) {
1806 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1807 // -Xnoconcgc
1808 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1809 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1810 // -Xbatch
1811 } else if (match_option(option, "-Xbatch", &tail)) {
1812 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1813 // -Xmn for compatibility with other JVM vendors
1814 } else if (match_option(option, "-Xmn", &tail)) {
1815 jlong long_initial_eden_size = 0;
1816 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1817 if (errcode != arg_in_range) {
1818 jio_fprintf(defaultStream::error_stream(),
1819 "Invalid initial eden size: %s\n", option->optionString);
1820 describe_range_error(errcode);
1821 return JNI_EINVAL;
1822 }
1823 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1824 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1825 // -Xms
1826 } else if (match_option(option, "-Xms", &tail)) {
1827 jlong long_initial_heap_size = 0;
1828 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1829 if (errcode != arg_in_range) {
1830 jio_fprintf(defaultStream::error_stream(),
1831 "Invalid initial heap size: %s\n", option->optionString);
1832 describe_range_error(errcode);
1833 return JNI_EINVAL;
1834 }
1835 set_initial_heap_size((size_t) long_initial_heap_size);
1836 // Currently the minimum size and the initial heap sizes are the same.
1837 set_min_heap_size(initial_heap_size());
1838 // -Xmx
1839 } else if (match_option(option, "-Xmx", &tail)) {
1840 jlong long_max_heap_size = 0;
1841 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1842 if (errcode != arg_in_range) {
1843 jio_fprintf(defaultStream::error_stream(),
1844 "Invalid maximum heap size: %s\n", option->optionString);
1845 describe_range_error(errcode);
1846 return JNI_EINVAL;
1847 }
1848 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1849 // Xmaxf
1850 } else if (match_option(option, "-Xmaxf", &tail)) {
1851 int maxf = (int)(atof(tail) * 100);
1852 if (maxf < 0 || maxf > 100) {
1853 jio_fprintf(defaultStream::error_stream(),
1854 "Bad max heap free percentage size: %s\n",
1855 option->optionString);
1856 return JNI_EINVAL;
1857 } else {
1858 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1859 }
1860 // Xminf
1861 } else if (match_option(option, "-Xminf", &tail)) {
1862 int minf = (int)(atof(tail) * 100);
1863 if (minf < 0 || minf > 100) {
1864 jio_fprintf(defaultStream::error_stream(),
1865 "Bad min heap free percentage size: %s\n",
1866 option->optionString);
1867 return JNI_EINVAL;
1868 } else {
1869 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1870 }
1871 // -Xss
1872 } else if (match_option(option, "-Xss", &tail)) {
1873 jlong long_ThreadStackSize = 0;
1874 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1875 if (errcode != arg_in_range) {
1876 jio_fprintf(defaultStream::error_stream(),
1877 "Invalid thread stack size: %s\n", option->optionString);
1878 describe_range_error(errcode);
1879 return JNI_EINVAL;
1880 }
1881 // Internally track ThreadStackSize in units of 1024 bytes.
1882 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1883 round_to((int)long_ThreadStackSize, K) / K);
1884 // -Xoss
1885 } else if (match_option(option, "-Xoss", &tail)) {
1886 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1887 // -Xmaxjitcodesize
1888 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1889 jlong long_ReservedCodeCacheSize = 0;
1890 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1891 InitialCodeCacheSize);
1892 if (errcode != arg_in_range) {
1893 jio_fprintf(defaultStream::error_stream(),
1894 "Invalid maximum code cache size: %s\n",
1895 option->optionString);
1896 describe_range_error(errcode);
1897 return JNI_EINVAL;
1898 }
1899 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1900 // -green
1901 } else if (match_option(option, "-green", &tail)) {
1902 jio_fprintf(defaultStream::error_stream(),
1903 "Green threads support not available\n");
1904 return JNI_EINVAL;
1905 // -native
1906 } else if (match_option(option, "-native", &tail)) {
1907 // HotSpot always uses native threads, ignore silently for compatibility
1908 // -Xsqnopause
1909 } else if (match_option(option, "-Xsqnopause", &tail)) {
1910 // EVM option, ignore silently for compatibility
1911 // -Xrs
1912 } else if (match_option(option, "-Xrs", &tail)) {
1913 // Classic/EVM option, new functionality
1914 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1915 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1916 // change default internal VM signals used - lower case for back compat
1917 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1918 // -Xoptimize
1919 } else if (match_option(option, "-Xoptimize", &tail)) {
1920 // EVM option, ignore silently for compatibility
1921 // -Xprof
1922 } else if (match_option(option, "-Xprof", &tail)) {
1923 #ifndef FPROF_KERNEL
1924 _has_profile = true;
1925 #else // FPROF_KERNEL
1926 // do we have to exit?
1927 warning("Kernel VM does not support flat profiling.");
1928 #endif // FPROF_KERNEL
1929 // -Xaprof
1930 } else if (match_option(option, "-Xaprof", &tail)) {
1931 _has_alloc_profile = true;
1932 // -Xconcurrentio
1933 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1934 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1935 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1936 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
1937 FLAG_SET_CMDLINE(bool, UseTLAB, false);
1938 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
1940 // -Xinternalversion
1941 } else if (match_option(option, "-Xinternalversion", &tail)) {
1942 jio_fprintf(defaultStream::output_stream(), "%s\n",
1943 VM_Version::internal_vm_info_string());
1944 vm_exit(0);
1945 #ifndef PRODUCT
1946 // -Xprintflags
1947 } else if (match_option(option, "-Xprintflags", &tail)) {
1948 CommandLineFlags::printFlags();
1949 vm_exit(0);
1950 #endif
1951 // -D
1952 } else if (match_option(option, "-D", &tail)) {
1953 if (!add_property(tail)) {
1954 return JNI_ENOMEM;
1955 }
1956 // Out of the box management support
1957 if (match_option(option, "-Dcom.sun.management", &tail)) {
1958 FLAG_SET_CMDLINE(bool, ManagementServer, true);
1959 }
1960 // -Xint
1961 } else if (match_option(option, "-Xint", &tail)) {
1962 set_mode_flags(_int);
1963 // -Xmixed
1964 } else if (match_option(option, "-Xmixed", &tail)) {
1965 set_mode_flags(_mixed);
1966 // -Xcomp
1967 } else if (match_option(option, "-Xcomp", &tail)) {
1968 // for testing the compiler; turn off all flags that inhibit compilation
1969 set_mode_flags(_comp);
1971 // -Xshare:dump
1972 } else if (match_option(option, "-Xshare:dump", &tail)) {
1973 #ifdef TIERED
1974 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
1975 set_mode_flags(_int); // Prevent compilation, which creates objects
1976 #elif defined(COMPILER2)
1977 vm_exit_during_initialization(
1978 "Dumping a shared archive is not supported on the Server JVM.", NULL);
1979 #elif defined(KERNEL)
1980 vm_exit_during_initialization(
1981 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
1982 #else
1983 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
1984 set_mode_flags(_int); // Prevent compilation, which creates objects
1985 #endif
1986 // -Xshare:on
1987 } else if (match_option(option, "-Xshare:on", &tail)) {
1988 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
1989 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
1990 #ifdef TIERED
1991 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
1992 #endif // TIERED
1993 // -Xshare:auto
1994 } else if (match_option(option, "-Xshare:auto", &tail)) {
1995 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
1996 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
1997 // -Xshare:off
1998 } else if (match_option(option, "-Xshare:off", &tail)) {
1999 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2000 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2002 // -Xverify
2003 } else if (match_option(option, "-Xverify", &tail)) {
2004 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2005 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2006 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2007 } else if (strcmp(tail, ":remote") == 0) {
2008 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2009 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2010 } else if (strcmp(tail, ":none") == 0) {
2011 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2012 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2013 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2014 return JNI_EINVAL;
2015 }
2016 // -Xdebug
2017 } else if (match_option(option, "-Xdebug", &tail)) {
2018 // note this flag has been used, then ignore
2019 set_xdebug_mode(true);
2020 // -Xnoagent
2021 } else if (match_option(option, "-Xnoagent", &tail)) {
2022 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2023 } else if (match_option(option, "-Xboundthreads", &tail)) {
2024 // Bind user level threads to kernel threads (Solaris only)
2025 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2026 } else if (match_option(option, "-Xloggc:", &tail)) {
2027 // Redirect GC output to the file. -Xloggc:<filename>
2028 // ostream_init_log(), when called will use this filename
2029 // to initialize a fileStream.
2030 _gc_log_filename = strdup(tail);
2031 FLAG_SET_CMDLINE(bool, PrintGC, true);
2032 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2033 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2035 // JNI hooks
2036 } else if (match_option(option, "-Xcheck", &tail)) {
2037 if (!strcmp(tail, ":jni")) {
2038 CheckJNICalls = true;
2039 } else if (is_bad_option(option, args->ignoreUnrecognized,
2040 "check")) {
2041 return JNI_EINVAL;
2042 }
2043 } else if (match_option(option, "vfprintf", &tail)) {
2044 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2045 } else if (match_option(option, "exit", &tail)) {
2046 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2047 } else if (match_option(option, "abort", &tail)) {
2048 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2049 // -XX:+AggressiveHeap
2050 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2052 // This option inspects the machine and attempts to set various
2053 // parameters to be optimal for long-running, memory allocation
2054 // intensive jobs. It is intended for machines with large
2055 // amounts of cpu and memory.
2057 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2058 // VM, but we may not be able to represent the total physical memory
2059 // available (like having 8gb of memory on a box but using a 32bit VM).
2060 // Thus, we need to make sure we're using a julong for intermediate
2061 // calculations.
2062 julong initHeapSize;
2063 julong total_memory = os::physical_memory();
2065 if (total_memory < (julong)256*M) {
2066 jio_fprintf(defaultStream::error_stream(),
2067 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2068 vm_exit(1);
2069 }
2071 // The heap size is half of available memory, or (at most)
2072 // all of possible memory less 160mb (leaving room for the OS
2073 // when using ISM). This is the maximum; because adaptive sizing
2074 // is turned on below, the actual space used may be smaller.
2076 initHeapSize = MIN2(total_memory / (julong)2,
2077 total_memory - (julong)160*M);
2079 // Make sure that if we have a lot of memory we cap the 32 bit
2080 // process space. The 64bit VM version of this function is a nop.
2081 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2083 // The perm gen is separate but contiguous with the
2084 // object heap (and is reserved with it) so subtract it
2085 // from the heap size.
2086 if (initHeapSize > MaxPermSize) {
2087 initHeapSize = initHeapSize - MaxPermSize;
2088 } else {
2089 warning("AggressiveHeap and MaxPermSize values may conflict");
2090 }
2092 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2093 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2094 set_initial_heap_size(MaxHeapSize);
2095 // Currently the minimum size and the initial heap sizes are the same.
2096 set_min_heap_size(initial_heap_size());
2097 }
2098 if (FLAG_IS_DEFAULT(NewSize)) {
2099 // Make the young generation 3/8ths of the total heap.
2100 FLAG_SET_CMDLINE(uintx, NewSize,
2101 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2102 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2103 }
2105 FLAG_SET_DEFAULT(UseLargePages, true);
2107 // Increase some data structure sizes for efficiency
2108 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2109 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2110 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2112 // See the OldPLABSize comment below, but replace 'after promotion'
2113 // with 'after copying'. YoungPLABSize is the size of the survivor
2114 // space per-gc-thread buffers. The default is 4kw.
2115 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2117 // OldPLABSize is the size of the buffers in the old gen that
2118 // UseParallelGC uses to promote live data that doesn't fit in the
2119 // survivor spaces. At any given time, there's one for each gc thread.
2120 // The default size is 1kw. These buffers are rarely used, since the
2121 // survivor spaces are usually big enough. For specjbb, however, there
2122 // are occasions when there's lots of live data in the young gen
2123 // and we end up promoting some of it. We don't have a definite
2124 // explanation for why bumping OldPLABSize helps, but the theory
2125 // is that a bigger PLAB results in retaining something like the
2126 // original allocation order after promotion, which improves mutator
2127 // locality. A minor effect may be that larger PLABs reduce the
2128 // number of PLAB allocation events during gc. The value of 8kw
2129 // was arrived at by experimenting with specjbb.
2130 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2132 // CompilationPolicyChoice=0 causes the server compiler to adopt
2133 // a more conservative which-method-do-I-compile policy when one
2134 // of the counters maintained by the interpreter trips. The
2135 // result is reduced startup time and improved specjbb and
2136 // alacrity performance. Zero is the default, but we set it
2137 // explicitly here in case the default changes.
2138 // See runtime/compilationPolicy.*.
2139 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2141 // Enable parallel GC and adaptive generation sizing
2142 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2143 FLAG_SET_DEFAULT(ParallelGCThreads,
2144 Abstract_VM_Version::parallel_worker_threads());
2146 // Encourage steady state memory management
2147 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2149 // This appears to improve mutator locality
2150 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2152 // Get around early Solaris scheduling bug
2153 // (affinity vs other jobs on system)
2154 // but disallow DR and offlining (5008695).
2155 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2157 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2158 // The last option must always win.
2159 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2160 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2161 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2162 // The last option must always win.
2163 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2164 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2165 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2166 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "Please use CMSClassUnloadingEnabled in place of "
2169 "CMSPermGenSweepingEnabled in the future\n");
2170 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2171 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2172 jio_fprintf(defaultStream::error_stream(),
2173 "Please use -XX:+UseGCOverheadLimit in place of "
2174 "-XX:+UseGCTimeLimit in the future\n");
2175 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2176 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2177 jio_fprintf(defaultStream::error_stream(),
2178 "Please use -XX:-UseGCOverheadLimit in place of "
2179 "-XX:-UseGCTimeLimit in the future\n");
2180 // The TLE options are for compatibility with 1.3 and will be
2181 // removed without notice in a future release. These options
2182 // are not to be documented.
2183 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2184 // No longer used.
2185 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2186 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2187 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2188 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2189 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2190 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2191 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2192 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2193 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2194 // No longer used.
2195 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2196 jlong long_tlab_size = 0;
2197 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2198 if (errcode != arg_in_range) {
2199 jio_fprintf(defaultStream::error_stream(),
2200 "Invalid TLAB size: %s\n", option->optionString);
2201 describe_range_error(errcode);
2202 return JNI_EINVAL;
2203 }
2204 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2205 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2206 // No longer used.
2207 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2208 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2209 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2210 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2211 SOLARIS_ONLY(
2212 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2213 warning("-XX:+UsePermISM is obsolete.");
2214 FLAG_SET_CMDLINE(bool, UseISM, true);
2215 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2216 FLAG_SET_CMDLINE(bool, UseISM, false);
2217 )
2218 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2219 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2220 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2221 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2222 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2223 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2224 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2225 #ifdef SOLARIS
2226 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2227 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2228 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2229 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2230 #else // ndef SOLARIS
2231 jio_fprintf(defaultStream::error_stream(),
2232 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2233 return JNI_EINVAL;
2234 #endif // ndef SOLARIS
2235 } else
2236 #ifdef ASSERT
2237 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2238 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2239 // disable scavenge before parallel mark-compact
2240 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2241 } else
2242 #endif
2243 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2244 julong cms_blocks_to_claim = (julong)atol(tail);
2245 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2246 jio_fprintf(defaultStream::error_stream(),
2247 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2248 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2249 } else
2250 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2251 jlong old_plab_size = 0;
2252 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2253 if (errcode != arg_in_range) {
2254 jio_fprintf(defaultStream::error_stream(),
2255 "Invalid old PLAB size: %s\n", option->optionString);
2256 describe_range_error(errcode);
2257 return JNI_EINVAL;
2258 }
2259 FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size);
2260 jio_fprintf(defaultStream::error_stream(),
2261 "Please use -XX:OldPLABSize in place of "
2262 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2263 } else
2264 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2265 jlong young_plab_size = 0;
2266 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2267 if (errcode != arg_in_range) {
2268 jio_fprintf(defaultStream::error_stream(),
2269 "Invalid young PLAB size: %s\n", option->optionString);
2270 describe_range_error(errcode);
2271 return JNI_EINVAL;
2272 }
2273 FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size);
2274 jio_fprintf(defaultStream::error_stream(),
2275 "Please use -XX:YoungPLABSize in place of "
2276 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2277 } else
2278 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2279 // Skip -XX:Flags= since that case has already been handled
2280 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2281 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2282 return JNI_EINVAL;
2283 }
2284 }
2285 // Unknown option
2286 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2287 return JNI_ERR;
2288 }
2289 }
2291 return JNI_OK;
2292 }
2294 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2295 // This must be done after all -D arguments have been processed.
2296 scp_p->expand_endorsed();
2298 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2299 // Assemble the bootclasspath elements into the final path.
2300 Arguments::set_sysclasspath(scp_p->combined_path());
2301 }
2303 // This must be done after all arguments have been processed.
2304 // java_compiler() true means set to "NONE" or empty.
2305 if (java_compiler() && !xdebug_mode()) {
2306 // For backwards compatibility, we switch to interpreted mode if
2307 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2308 // not specified.
2309 set_mode_flags(_int);
2310 }
2311 if (CompileThreshold == 0) {
2312 set_mode_flags(_int);
2313 }
2315 #ifdef TIERED
2316 // If we are using tiered compilation in the tiered vm then c1 will
2317 // do the profiling and we don't want to waste that time in the
2318 // interpreter.
2319 if (TieredCompilation) {
2320 ProfileInterpreter = false;
2321 } else {
2322 // Since we are running vanilla server we must adjust the compile threshold
2323 // unless the user has already adjusted it because the default threshold assumes
2324 // we will run tiered.
2326 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2327 CompileThreshold = Tier2CompileThreshold;
2328 }
2329 }
2330 #endif // TIERED
2332 #ifndef COMPILER2
2333 // Don't degrade server performance for footprint
2334 if (FLAG_IS_DEFAULT(UseLargePages) &&
2335 MaxHeapSize < LargePageHeapSizeThreshold) {
2336 // No need for large granularity pages w/small heaps.
2337 // Note that large pages are enabled/disabled for both the
2338 // Java heap and the code cache.
2339 FLAG_SET_DEFAULT(UseLargePages, false);
2340 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2341 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2342 }
2344 #else
2345 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2346 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2347 }
2348 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2349 if (UseG1GC) {
2350 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2351 }
2352 #endif
2354 if (!check_vm_args_consistency()) {
2355 return JNI_ERR;
2356 }
2358 return JNI_OK;
2359 }
2361 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2362 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2363 scp_assembly_required_p);
2364 }
2366 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2367 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2368 scp_assembly_required_p);
2369 }
2371 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2372 const int N_MAX_OPTIONS = 64;
2373 const int OPTION_BUFFER_SIZE = 1024;
2374 char buffer[OPTION_BUFFER_SIZE];
2376 // The variable will be ignored if it exceeds the length of the buffer.
2377 // Don't check this variable if user has special privileges
2378 // (e.g. unix su command).
2379 if (os::getenv(name, buffer, sizeof(buffer)) &&
2380 !os::have_special_privileges()) {
2381 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Picked up %s: %s\n", name, buffer);
2384 char* rd = buffer; // pointer to the input string (rd)
2385 int i;
2386 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2387 while (isspace(*rd)) rd++; // skip whitespace
2388 if (*rd == 0) break; // we re done when the input string is read completely
2390 // The output, option string, overwrites the input string.
2391 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2392 // input string (rd).
2393 char* wrt = rd;
2395 options[i++].optionString = wrt; // Fill in option
2396 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2397 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2398 int quote = *rd; // matching quote to look for
2399 rd++; // don't copy open quote
2400 while (*rd != quote) { // include everything (even spaces) up until quote
2401 if (*rd == 0) { // string termination means unmatched string
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Unmatched quote in %s\n", name);
2404 return JNI_ERR;
2405 }
2406 *wrt++ = *rd++; // copy to option string
2407 }
2408 rd++; // don't copy close quote
2409 } else {
2410 *wrt++ = *rd++; // copy to option string
2411 }
2412 }
2413 // Need to check if we're done before writing a NULL,
2414 // because the write could be to the byte that rd is pointing to.
2415 if (*rd++ == 0) {
2416 *wrt = 0;
2417 break;
2418 }
2419 *wrt = 0; // Zero terminate option
2420 }
2421 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2422 JavaVMInitArgs vm_args;
2423 vm_args.version = JNI_VERSION_1_2;
2424 vm_args.options = options;
2425 vm_args.nOptions = i;
2426 vm_args.ignoreUnrecognized = false;
2428 if (PrintVMOptions) {
2429 const char* tail;
2430 for (int i = 0; i < vm_args.nOptions; i++) {
2431 const JavaVMOption *option = vm_args.options + i;
2432 if (match_option(option, "-XX:", &tail)) {
2433 logOption(tail);
2434 }
2435 }
2436 }
2438 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2439 }
2440 return JNI_OK;
2441 }
2443 // Parse entry point called from JNI_CreateJavaVM
2445 jint Arguments::parse(const JavaVMInitArgs* args) {
2447 // Sharing support
2448 // Construct the path to the archive
2449 char jvm_path[JVM_MAXPATHLEN];
2450 os::jvm_path(jvm_path, sizeof(jvm_path));
2451 #ifdef TIERED
2452 if (strstr(jvm_path, "client") != NULL) {
2453 force_client_mode = true;
2454 }
2455 #endif // TIERED
2456 char *end = strrchr(jvm_path, *os::file_separator());
2457 if (end != NULL) *end = '\0';
2458 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2459 strlen(os::file_separator()) + 20);
2460 if (shared_archive_path == NULL) return JNI_ENOMEM;
2461 strcpy(shared_archive_path, jvm_path);
2462 strcat(shared_archive_path, os::file_separator());
2463 strcat(shared_archive_path, "classes");
2464 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2465 strcat(shared_archive_path, ".jsa");
2466 SharedArchivePath = shared_archive_path;
2468 // Remaining part of option string
2469 const char* tail;
2471 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2472 bool settings_file_specified = false;
2473 int index;
2474 for (index = 0; index < args->nOptions; index++) {
2475 const JavaVMOption *option = args->options + index;
2476 if (match_option(option, "-XX:Flags=", &tail)) {
2477 if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {
2478 return JNI_EINVAL;
2479 }
2480 settings_file_specified = true;
2481 }
2482 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2483 PrintVMOptions = true;
2484 }
2485 }
2487 // Parse default .hotspotrc settings file
2488 if (!settings_file_specified) {
2489 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2490 return JNI_EINVAL;
2491 }
2492 }
2494 if (PrintVMOptions) {
2495 for (index = 0; index < args->nOptions; index++) {
2496 const JavaVMOption *option = args->options + index;
2497 if (match_option(option, "-XX:", &tail)) {
2498 logOption(tail);
2499 }
2500 }
2501 }
2504 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2505 jint result = parse_vm_init_args(args);
2506 if (result != JNI_OK) {
2507 return result;
2508 }
2510 // These are hacks until G1 is fully supported and tested
2511 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
2512 if (UseG1GC) {
2513 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
2514 #ifndef PRODUCT
2515 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
2516 #endif // PRODUCT
2517 UseConcMarkSweepGC = false;
2518 UseParNewGC = false;
2519 UseParallelGC = false;
2520 UseParallelOldGC = false;
2521 UseSerialGC = false;
2522 }
2523 no_shared_spaces();
2524 }
2526 #ifndef PRODUCT
2527 if (TraceBytecodesAt != 0) {
2528 TraceBytecodes = true;
2529 }
2530 if (CountCompiledCalls) {
2531 if (UseCounterDecay) {
2532 warning("UseCounterDecay disabled because CountCalls is set");
2533 UseCounterDecay = false;
2534 }
2535 }
2536 #endif // PRODUCT
2538 if (PrintGCDetails) {
2539 // Turn on -verbose:gc options as well
2540 PrintGC = true;
2541 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2542 TraceClassUnloading = true;
2543 }
2544 }
2546 #ifdef SERIALGC
2547 set_serial_gc_flags();
2548 #endif // SERIALGC
2549 #ifdef KERNEL
2550 no_shared_spaces();
2551 #endif // KERNEL
2553 // Set flags based on ergonomics.
2554 set_ergonomics_flags();
2556 // Check the GC selections again.
2557 if (!check_gc_consistency()) {
2558 return JNI_EINVAL;
2559 }
2561 if (UseParallelGC || UseParallelOldGC) {
2562 // Set some flags for ParallelGC if needed.
2563 set_parallel_gc_flags();
2564 } else if (UseConcMarkSweepGC) {
2565 // Set some flags for CMS
2566 set_cms_and_parnew_gc_flags();
2567 } else if (UseParNewGC) {
2568 // Set some flags for ParNew
2569 set_parnew_gc_flags();
2570 }
2571 // Temporary; make the "if" an "else-if" before
2572 // we integrate G1. XXX
2573 if (UseG1GC) {
2574 // Set some flags for garbage-first, if needed.
2575 set_g1_gc_flags();
2576 }
2578 #ifdef SERIALGC
2579 assert(verify_serial_gc_flags(), "SerialGC unset");
2580 #endif // SERIALGC
2582 // Set bytecode rewriting flags
2583 set_bytecode_flags();
2585 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2586 set_aggressive_opts_flags();
2588 #ifdef CC_INTERP
2589 // Biased locking is not implemented with c++ interpreter
2590 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2591 #endif /* CC_INTERP */
2593 if (PrintCommandLineFlags) {
2594 CommandLineFlags::printSetFlags();
2595 }
2597 #ifdef ASSERT
2598 if (PrintFlagsFinal) {
2599 CommandLineFlags::printFlags();
2600 }
2601 #endif
2603 return JNI_OK;
2604 }
2606 int Arguments::PropertyList_count(SystemProperty* pl) {
2607 int count = 0;
2608 while(pl != NULL) {
2609 count++;
2610 pl = pl->next();
2611 }
2612 return count;
2613 }
2615 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2616 assert(key != NULL, "just checking");
2617 SystemProperty* prop;
2618 for (prop = pl; prop != NULL; prop = prop->next()) {
2619 if (strcmp(key, prop->key()) == 0) return prop->value();
2620 }
2621 return NULL;
2622 }
2624 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2625 int count = 0;
2626 const char* ret_val = NULL;
2628 while(pl != NULL) {
2629 if(count >= index) {
2630 ret_val = pl->key();
2631 break;
2632 }
2633 count++;
2634 pl = pl->next();
2635 }
2637 return ret_val;
2638 }
2640 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2641 int count = 0;
2642 char* ret_val = NULL;
2644 while(pl != NULL) {
2645 if(count >= index) {
2646 ret_val = pl->value();
2647 break;
2648 }
2649 count++;
2650 pl = pl->next();
2651 }
2653 return ret_val;
2654 }
2656 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2657 SystemProperty* p = *plist;
2658 if (p == NULL) {
2659 *plist = new_p;
2660 } else {
2661 while (p->next() != NULL) {
2662 p = p->next();
2663 }
2664 p->set_next(new_p);
2665 }
2666 }
2668 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2669 if (plist == NULL)
2670 return;
2672 SystemProperty* new_p = new SystemProperty(k, v, true);
2673 PropertyList_add(plist, new_p);
2674 }
2676 // This add maintains unique property key in the list.
2677 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
2678 if (plist == NULL)
2679 return;
2681 // If property key exist then update with new value.
2682 SystemProperty* prop;
2683 for (prop = *plist; prop != NULL; prop = prop->next()) {
2684 if (strcmp(k, prop->key()) == 0) {
2685 prop->set_value(v);
2686 return;
2687 }
2688 }
2690 PropertyList_add(plist, k, v);
2691 }
2693 #ifdef KERNEL
2694 char *Arguments::get_kernel_properties() {
2695 // Find properties starting with kernel and append them to string
2696 // We need to find out how long they are first because the URL's that they
2697 // might point to could get long.
2698 int length = 0;
2699 SystemProperty* prop;
2700 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2701 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2702 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2703 }
2704 }
2705 // Add one for null terminator.
2706 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2707 if (length != 0) {
2708 int pos = 0;
2709 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2710 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2711 jio_snprintf(&props[pos], length-pos,
2712 "-D%s=%s ", prop->key(), prop->value());
2713 pos = strlen(props);
2714 }
2715 }
2716 }
2717 // null terminate props in case of null
2718 props[length] = '\0';
2719 return props;
2720 }
2721 #endif // KERNEL
2723 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2724 // Returns true if all of the source pointed by src has been copied over to
2725 // the destination buffer pointed by buf. Otherwise, returns false.
2726 // Notes:
2727 // 1. If the length (buflen) of the destination buffer excluding the
2728 // NULL terminator character is not long enough for holding the expanded
2729 // pid characters, it also returns false instead of returning the partially
2730 // expanded one.
2731 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2732 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2733 char* buf, size_t buflen) {
2734 const char* p = src;
2735 char* b = buf;
2736 const char* src_end = &src[srclen];
2737 char* buf_end = &buf[buflen - 1];
2739 while (p < src_end && b < buf_end) {
2740 if (*p == '%') {
2741 switch (*(++p)) {
2742 case '%': // "%%" ==> "%"
2743 *b++ = *p++;
2744 break;
2745 case 'p': { // "%p" ==> current process id
2746 // buf_end points to the character before the last character so
2747 // that we could write '\0' to the end of the buffer.
2748 size_t buf_sz = buf_end - b + 1;
2749 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2751 // if jio_snprintf fails or the buffer is not long enough to hold
2752 // the expanded pid, returns false.
2753 if (ret < 0 || ret >= (int)buf_sz) {
2754 return false;
2755 } else {
2756 b += ret;
2757 assert(*b == '\0', "fail in copy_expand_pid");
2758 if (p == src_end && b == buf_end + 1) {
2759 // reach the end of the buffer.
2760 return true;
2761 }
2762 }
2763 p++;
2764 break;
2765 }
2766 default :
2767 *b++ = '%';
2768 }
2769 } else {
2770 *b++ = *p++;
2771 }
2772 }
2773 *b = '\0';
2774 return (p == src_end); // return false if not all of the source was copied
2775 }