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