1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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::_min_heap_size = 0;
41 Arguments::Mode Arguments::_mode = _mixed;
42 bool Arguments::_java_compiler = false;
43 bool Arguments::_xdebug_mode = false;
44 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
45 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
46 int Arguments::_sun_java_launcher_pid = -1;
47
48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
49 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
50 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
51 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
52 bool Arguments::_ClipInlining = ClipInlining;
53 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
54
55 char* Arguments::SharedArchivePath = NULL;
56
57 AgentLibraryList Arguments::_libraryList;
58 AgentLibraryList Arguments::_agentList;
59
60 abort_hook_t Arguments::_abort_hook = NULL;
61 exit_hook_t Arguments::_exit_hook = NULL;
62 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
63
64
65 SystemProperty *Arguments::_java_ext_dirs = NULL;
66 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
67 SystemProperty *Arguments::_sun_boot_library_path = NULL;
68 SystemProperty *Arguments::_java_library_path = NULL;
69 SystemProperty *Arguments::_java_home = NULL;
70 SystemProperty *Arguments::_java_class_path = NULL;
71 SystemProperty *Arguments::_sun_boot_class_path = NULL;
72
73 char* Arguments::_meta_index_path = NULL;
74 char* Arguments::_meta_index_dir = NULL;
75
76 static bool force_client_mode = false;
77
78 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
79
80 static bool match_option(const JavaVMOption *option, const char* name,
81 const char** tail) {
82 int len = (int)strlen(name);
83 if (strncmp(option->optionString, name, len) == 0) {
84 *tail = option->optionString + len;
85 return true;
86 } else {
87 return false;
88 }
89 }
90
91 static void logOption(const char* opt) {
92 if (PrintVMOptions) {
93 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
94 }
95 }
96
97 // Process java launcher properties.
98 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
99 // See if sun.java.launcher or sun.java.launcher.pid is defined.
100 // Must do this before setting up other system properties,
101 // as some of them may depend on launcher type.
102 for (int index = 0; index < args->nOptions; index++) {
103 const JavaVMOption* option = args->options + index;
104 const char* tail;
105
106 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
107 process_java_launcher_argument(tail, option->extraInfo);
108 continue;
109 }
110 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
111 _sun_java_launcher_pid = atoi(tail);
112 continue;
113 }
114 }
115 }
116
117 // Initialize system properties key and value.
118 void Arguments::init_system_properties() {
119
120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
122 "Java Virtual Machine Specification", false));
123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
124 "Sun Microsystems Inc.", false));
125 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
129
130 // following are JVMTI agent writeable properties.
131 // Properties values are set to NULL and they are
132 // os specific they are initialized in os::init_system_properties_values().
133 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
134 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
135 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
136 _java_library_path = new SystemProperty("java.library.path", NULL, true);
137 _java_home = new SystemProperty("java.home", NULL, true);
138 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
139
140 _java_class_path = new SystemProperty("java.class.path", "", true);
141
142 // Add to System Property list.
143 PropertyList_add(&_system_properties, _java_ext_dirs);
144 PropertyList_add(&_system_properties, _java_endorsed_dirs);
145 PropertyList_add(&_system_properties, _sun_boot_library_path);
146 PropertyList_add(&_system_properties, _java_library_path);
147 PropertyList_add(&_system_properties, _java_home);
148 PropertyList_add(&_system_properties, _java_class_path);
149 PropertyList_add(&_system_properties, _sun_boot_class_path);
150
151 // Set OS specific system properties values
152 os::init_system_properties_values();
153 }
154
155 /**
156 * Provide a slightly more user-friendly way of eliminating -XX flags.
157 * When a flag is eliminated, it can be added to this list in order to
158 * continue accepting this flag on the command-line, while issuing a warning
159 * and ignoring the value. Once the JDK version reaches the 'accept_until'
160 * limit, we flatly refuse to admit the existence of the flag. This allows
161 * a flag to die correctly over JDK releases using HSX.
162 */
163 typedef struct {
164 const char* name;
165 JDK_Version obsoleted_in; // when the flag went away
166 JDK_Version accept_until; // which version to start denying the existence
167 } ObsoleteFlag;
168
169 static ObsoleteFlag obsolete_jvm_flags[] = {
170 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
171 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
184 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
185 { "DefaultInitialRAMFraction",
186 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
187 { NULL, JDK_Version(0), JDK_Version(0) }
188 };
189
190 // Returns true if the flag is obsolete and fits into the range specified
191 // for being ignored. In the case that the flag is ignored, the 'version'
192 // value is filled in with the version number when the flag became
193 // obsolete so that that value can be displayed to the user.
194 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
195 int i = 0;
196 assert(version != NULL, "Must provide a version buffer");
197 while (obsolete_jvm_flags[i].name != NULL) {
198 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
199 // <flag>=xxx form
200 // [-|+]<flag> form
201 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
202 ((s[0] == '+' || s[0] == '-') &&
203 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
204 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
205 *version = flag_status.obsoleted_in;
206 return true;
207 }
208 }
209 i++;
210 }
211 return false;
212 }
213
214 // Constructs the system class path (aka boot class path) from the following
215 // components, in order:
216 //
217 // prefix // from -Xbootclasspath/p:...
218 // endorsed // the expansion of -Djava.endorsed.dirs=...
219 // base // from os::get_system_properties() or -Xbootclasspath=
220 // suffix // from -Xbootclasspath/a:...
221 //
222 // java.endorsed.dirs is a list of directories; any jar or zip files in the
223 // directories are added to the sysclasspath just before the base.
224 //
225 // This could be AllStatic, but it isn't needed after argument processing is
226 // complete.
227 class SysClassPath: public StackObj {
228 public:
229 SysClassPath(const char* base);
230 ~SysClassPath();
231
232 inline void set_base(const char* base);
233 inline void add_prefix(const char* prefix);
234 inline void add_suffix_to_prefix(const char* suffix);
235 inline void add_suffix(const char* suffix);
236 inline void reset_path(const char* base);
237
238 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
239 // property. Must be called after all command-line arguments have been
240 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
241 // combined_path().
242 void expand_endorsed();
243
244 inline const char* get_base() const { return _items[_scp_base]; }
245 inline const char* get_prefix() const { return _items[_scp_prefix]; }
246 inline const char* get_suffix() const { return _items[_scp_suffix]; }
247 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
248
249 // Combine all the components into a single c-heap-allocated string; caller
250 // must free the string if/when no longer needed.
251 char* combined_path();
252
253 private:
254 // Utility routines.
255 static char* add_to_path(const char* path, const char* str, bool prepend);
256 static char* add_jars_to_path(char* path, const char* directory);
257
258 inline void reset_item_at(int index);
259
260 // Array indices for the items that make up the sysclasspath. All except the
261 // base are allocated in the C heap and freed by this class.
262 enum {
263 _scp_prefix, // from -Xbootclasspath/p:...
264 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
265 _scp_base, // the default sysclasspath
266 _scp_suffix, // from -Xbootclasspath/a:...
267 _scp_nitems // the number of items, must be last.
268 };
269
270 const char* _items[_scp_nitems];
271 DEBUG_ONLY(bool _expansion_done;)
272 };
273
274 SysClassPath::SysClassPath(const char* base) {
275 memset(_items, 0, sizeof(_items));
276 _items[_scp_base] = base;
277 DEBUG_ONLY(_expansion_done = false;)
278 }
279
280 SysClassPath::~SysClassPath() {
281 // Free everything except the base.
282 for (int i = 0; i < _scp_nitems; ++i) {
283 if (i != _scp_base) reset_item_at(i);
284 }
285 DEBUG_ONLY(_expansion_done = false;)
286 }
287
288 inline void SysClassPath::set_base(const char* base) {
289 _items[_scp_base] = base;
290 }
291
292 inline void SysClassPath::add_prefix(const char* prefix) {
293 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
294 }
295
296 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
297 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
298 }
299
300 inline void SysClassPath::add_suffix(const char* suffix) {
301 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
302 }
303
304 inline void SysClassPath::reset_item_at(int index) {
305 assert(index < _scp_nitems && index != _scp_base, "just checking");
306 if (_items[index] != NULL) {
307 FREE_C_HEAP_ARRAY(char, _items[index]);
308 _items[index] = NULL;
309 }
310 }
311
312 inline void SysClassPath::reset_path(const char* base) {
313 // Clear the prefix and suffix.
314 reset_item_at(_scp_prefix);
315 reset_item_at(_scp_suffix);
316 set_base(base);
317 }
318
319 //------------------------------------------------------------------------------
320
321 void SysClassPath::expand_endorsed() {
322 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
323
324 const char* path = Arguments::get_property("java.endorsed.dirs");
325 if (path == NULL) {
326 path = Arguments::get_endorsed_dir();
327 assert(path != NULL, "no default for java.endorsed.dirs");
328 }
329
330 char* expanded_path = NULL;
331 const char separator = *os::path_separator();
332 const char* const end = path + strlen(path);
333 while (path < end) {
334 const char* tmp_end = strchr(path, separator);
335 if (tmp_end == NULL) {
336 expanded_path = add_jars_to_path(expanded_path, path);
337 path = end;
338 } else {
339 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
340 memcpy(dirpath, path, tmp_end - path);
341 dirpath[tmp_end - path] = '\0';
342 expanded_path = add_jars_to_path(expanded_path, dirpath);
343 FREE_C_HEAP_ARRAY(char, dirpath);
344 path = tmp_end + 1;
345 }
346 }
347 _items[_scp_endorsed] = expanded_path;
348 DEBUG_ONLY(_expansion_done = true;)
349 }
350
351 // Combine the bootclasspath elements, some of which may be null, into a single
352 // c-heap-allocated string.
353 char* SysClassPath::combined_path() {
354 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
355 assert(_expansion_done, "must call expand_endorsed() first.");
356
357 size_t lengths[_scp_nitems];
358 size_t total_len = 0;
359
360 const char separator = *os::path_separator();
361
362 // Get the lengths.
363 int i;
364 for (i = 0; i < _scp_nitems; ++i) {
365 if (_items[i] != NULL) {
366 lengths[i] = strlen(_items[i]);
367 // Include space for the separator char (or a NULL for the last item).
368 total_len += lengths[i] + 1;
369 }
370 }
371 assert(total_len > 0, "empty sysclasspath not allowed");
372
373 // Copy the _items to a single string.
374 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
375 char* cp_tmp = cp;
376 for (i = 0; i < _scp_nitems; ++i) {
377 if (_items[i] != NULL) {
378 memcpy(cp_tmp, _items[i], lengths[i]);
379 cp_tmp += lengths[i];
380 *cp_tmp++ = separator;
381 }
382 }
383 *--cp_tmp = '\0'; // Replace the extra separator.
384 return cp;
385 }
386
387 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
388 char*
389 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
390 char *cp;
391
392 assert(str != NULL, "just checking");
393 if (path == NULL) {
394 size_t len = strlen(str) + 1;
395 cp = NEW_C_HEAP_ARRAY(char, len);
396 memcpy(cp, str, len); // copy the trailing null
397 } else {
398 const char separator = *os::path_separator();
399 size_t old_len = strlen(path);
400 size_t str_len = strlen(str);
401 size_t len = old_len + str_len + 2;
402
403 if (prepend) {
404 cp = NEW_C_HEAP_ARRAY(char, len);
405 char* cp_tmp = cp;
406 memcpy(cp_tmp, str, str_len);
407 cp_tmp += str_len;
408 *cp_tmp = separator;
409 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
410 FREE_C_HEAP_ARRAY(char, path);
411 } else {
412 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
413 char* cp_tmp = cp + old_len;
414 *cp_tmp = separator;
415 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
416 }
417 }
418 return cp;
419 }
420
421 // Scan the directory and append any jar or zip files found to path.
422 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
423 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
424 DIR* dir = os::opendir(directory);
425 if (dir == NULL) return path;
426
427 char dir_sep[2] = { '\0', '\0' };
428 size_t directory_len = strlen(directory);
429 const char fileSep = *os::file_separator();
430 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
431
432 /* Scan the directory for jars/zips, appending them to path. */
433 struct dirent *entry;
434 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
435 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
436 const char* name = entry->d_name;
437 const char* ext = name + strlen(name) - 4;
438 bool isJarOrZip = ext > name &&
439 (os::file_name_strcmp(ext, ".jar") == 0 ||
440 os::file_name_strcmp(ext, ".zip") == 0);
441 if (isJarOrZip) {
442 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
443 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
444 path = add_to_path(path, jarpath, false);
445 FREE_C_HEAP_ARRAY(char, jarpath);
446 }
447 }
448 FREE_C_HEAP_ARRAY(char, dbuf);
449 os::closedir(dir);
450 return path;
451 }
452
453 // Parses a memory size specification string.
454 static bool atomull(const char *s, julong* result) {
455 julong n = 0;
456 int args_read = sscanf(s, os::julong_format_specifier(), &n);
457 if (args_read != 1) {
458 return false;
459 }
460 while (*s != '\0' && isdigit(*s)) {
461 s++;
462 }
463 // 4705540: illegal if more characters are found after the first non-digit
464 if (strlen(s) > 1) {
465 return false;
466 }
467 switch (*s) {
468 case 'T': case 't':
469 *result = n * G * K;
470 // Check for overflow.
471 if (*result/((julong)G * K) != n) return false;
472 return true;
473 case 'G': case 'g':
474 *result = n * G;
475 if (*result/G != n) return false;
476 return true;
477 case 'M': case 'm':
478 *result = n * M;
479 if (*result/M != n) return false;
480 return true;
481 case 'K': case 'k':
482 *result = n * K;
483 if (*result/K != n) return false;
484 return true;
485 case '\0':
486 *result = n;
487 return true;
488 default:
489 return false;
490 }
491 }
492
493 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
494 if (size < min_size) return arg_too_small;
495 // Check that size will fit in a size_t (only relevant on 32-bit)
496 if (size > max_uintx) return arg_too_big;
497 return arg_in_range;
498 }
499
500 // Describe an argument out of range error
501 void Arguments::describe_range_error(ArgsRange errcode) {
502 switch(errcode) {
503 case arg_too_big:
504 jio_fprintf(defaultStream::error_stream(),
505 "The specified size exceeds the maximum "
506 "representable size.\n");
507 break;
508 case arg_too_small:
509 case arg_unreadable:
510 case arg_in_range:
511 // do nothing for now
512 break;
513 default:
514 ShouldNotReachHere();
515 }
516 }
517
518 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
519 return CommandLineFlags::boolAtPut(name, &value, origin);
520 }
521
522 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
523 double v;
524 if (sscanf(value, "%lf", &v) != 1) {
525 return false;
526 }
527
528 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
529 return true;
530 }
531 return false;
532 }
533
534 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
535 julong v;
536 intx intx_v;
537 bool is_neg = false;
538 // Check the sign first since atomull() parses only unsigned values.
539 if (*value == '-') {
540 if (!CommandLineFlags::intxAt(name, &intx_v)) {
541 return false;
542 }
543 value++;
544 is_neg = true;
545 }
546 if (!atomull(value, &v)) {
547 return false;
548 }
549 intx_v = (intx) v;
550 if (is_neg) {
551 intx_v = -intx_v;
552 }
553 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
554 return true;
555 }
556 uintx uintx_v = (uintx) v;
557 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
558 return true;
559 }
560 uint64_t uint64_t_v = (uint64_t) v;
561 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
562 return true;
563 }
564 return false;
565 }
566
567 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
568 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
569 // Contract: CommandLineFlags always returns a pointer that needs freeing.
570 FREE_C_HEAP_ARRAY(char, value);
571 return true;
572 }
573
574 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
575 const char* old_value = "";
576 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
577 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
578 size_t new_len = strlen(new_value);
579 const char* value;
580 char* free_this_too = NULL;
581 if (old_len == 0) {
582 value = new_value;
583 } else if (new_len == 0) {
584 value = old_value;
585 } else {
586 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
587 // each new setting adds another LINE to the switch:
588 sprintf(buf, "%s\n%s", old_value, new_value);
589 value = buf;
590 free_this_too = buf;
591 }
592 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
593 // CommandLineFlags always returns a pointer that needs freeing.
594 FREE_C_HEAP_ARRAY(char, value);
595 if (free_this_too != NULL) {
596 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
597 FREE_C_HEAP_ARRAY(char, free_this_too);
598 }
599 return true;
600 }
601
602 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
603
604 // range of acceptable characters spelled out for portability reasons
605 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
606 #define BUFLEN 255
607 char name[BUFLEN+1];
608 char dummy;
609
610 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
611 return set_bool_flag(name, false, origin);
612 }
613 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
614 return set_bool_flag(name, true, origin);
615 }
616
617 char punct;
618 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
619 const char* value = strchr(arg, '=') + 1;
620 Flag* flag = Flag::find_flag(name, strlen(name));
621 if (flag != NULL && flag->is_ccstr()) {
622 if (flag->ccstr_accumulates()) {
623 return append_to_string_flag(name, value, origin);
624 } else {
625 if (value[0] == '\0') {
626 value = NULL;
627 }
628 return set_string_flag(name, value, origin);
629 }
630 }
631 }
632
633 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
634 const char* value = strchr(arg, '=') + 1;
635 // -XX:Foo:=xxx will reset the string flag to the given value.
636 if (value[0] == '\0') {
637 value = NULL;
638 }
639 return set_string_flag(name, value, origin);
640 }
641
642 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
643 #define SIGNED_NUMBER_RANGE "[-0123456789]"
644 #define NUMBER_RANGE "[0123456789]"
645 char value[BUFLEN + 1];
646 char value2[BUFLEN + 1];
647 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
648 // Looks like a floating-point number -- try again with more lenient format string
649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
650 return set_fp_numeric_flag(name, value, origin);
651 }
652 }
653
654 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
655 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
656 return set_numeric_flag(name, value, origin);
657 }
658
659 return false;
660 }
661
662 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
663 assert(bldarray != NULL, "illegal argument");
664
665 if (arg == NULL) {
666 return;
667 }
668
669 int index = *count;
670
671 // expand the array and add arg to the last element
672 (*count)++;
673 if (*bldarray == NULL) {
674 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
675 } else {
676 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
677 }
678 (*bldarray)[index] = strdup(arg);
679 }
680
681 void Arguments::build_jvm_args(const char* arg) {
682 add_string(&_jvm_args_array, &_num_jvm_args, arg);
683 }
684
685 void Arguments::build_jvm_flags(const char* arg) {
686 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
687 }
688
689 // utility function to return a string that concatenates all
690 // strings in a given char** array
691 const char* Arguments::build_resource_string(char** args, int count) {
692 if (args == NULL || count == 0) {
693 return NULL;
694 }
695 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
696 for (int i = 1; i < count; i++) {
697 length += strlen(args[i]) + 1; // add 1 for a space
698 }
699 char* s = NEW_RESOURCE_ARRAY(char, length);
700 strcpy(s, args[0]);
701 for (int j = 1; j < count; j++) {
702 strcat(s, " ");
703 strcat(s, args[j]);
704 }
705 return (const char*) s;
706 }
707
708 void Arguments::print_on(outputStream* st) {
709 st->print_cr("VM Arguments:");
710 if (num_jvm_flags() > 0) {
711 st->print("jvm_flags: "); print_jvm_flags_on(st);
712 }
713 if (num_jvm_args() > 0) {
714 st->print("jvm_args: "); print_jvm_args_on(st);
715 }
716 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
717 st->print_cr("Launcher Type: %s", _sun_java_launcher);
718 }
719
720 void Arguments::print_jvm_flags_on(outputStream* st) {
721 if (_num_jvm_flags > 0) {
722 for (int i=0; i < _num_jvm_flags; i++) {
723 st->print("%s ", _jvm_flags_array[i]);
724 }
725 st->print_cr("");
726 }
727 }
728
729 void Arguments::print_jvm_args_on(outputStream* st) {
730 if (_num_jvm_args > 0) {
731 for (int i=0; i < _num_jvm_args; i++) {
732 st->print("%s ", _jvm_args_array[i]);
733 }
734 st->print_cr("");
735 }
736 }
737
738 bool Arguments::process_argument(const char* arg,
739 jboolean ignore_unrecognized, FlagValueOrigin origin) {
740
741 JDK_Version since = JDK_Version();
742
743 if (parse_argument(arg, origin)) {
744 // do nothing
745 } else if (is_newly_obsolete(arg, &since)) {
746 enum { bufsize = 256 };
747 char buffer[bufsize];
748 since.to_string(buffer, bufsize);
749 jio_fprintf(defaultStream::error_stream(),
750 "Warning: The flag %s has been EOL'd as of %s and will"
751 " be ignored\n", arg, buffer);
752 } else {
753 if (!ignore_unrecognized) {
754 jio_fprintf(defaultStream::error_stream(),
755 "Unrecognized VM option '%s'\n", arg);
756 // allow for commandline "commenting out" options like -XX:#+Verbose
757 if (strlen(arg) == 0 || arg[0] != '#') {
758 return false;
759 }
760 }
761 }
762 return true;
763 }
764
765 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
766 FILE* stream = fopen(file_name, "rb");
767 if (stream == NULL) {
768 if (should_exist) {
769 jio_fprintf(defaultStream::error_stream(),
770 "Could not open settings file %s\n", file_name);
771 return false;
772 } else {
773 return true;
774 }
775 }
776
777 char token[1024];
778 int pos = 0;
779
780 bool in_white_space = true;
781 bool in_comment = false;
782 bool in_quote = false;
783 char quote_c = 0;
784 bool result = true;
785
786 int c = getc(stream);
787 while(c != EOF) {
788 if (in_white_space) {
789 if (in_comment) {
790 if (c == '\n') in_comment = false;
791 } else {
792 if (c == '#') in_comment = true;
793 else if (!isspace(c)) {
794 in_white_space = false;
795 token[pos++] = c;
796 }
797 }
798 } else {
799 if (c == '\n' || (!in_quote && isspace(c))) {
800 // token ends at newline, or at unquoted whitespace
801 // this allows a way to include spaces in string-valued options
802 token[pos] = '\0';
803 logOption(token);
804 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
805 build_jvm_flags(token);
806 pos = 0;
807 in_white_space = true;
808 in_quote = false;
809 } else if (!in_quote && (c == '\'' || c == '"')) {
810 in_quote = true;
811 quote_c = c;
812 } else if (in_quote && (c == quote_c)) {
813 in_quote = false;
814 } else {
815 token[pos++] = c;
816 }
817 }
818 c = getc(stream);
819 }
820 if (pos > 0) {
821 token[pos] = '\0';
822 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
823 build_jvm_flags(token);
824 }
825 fclose(stream);
826 return result;
827 }
828
829 //=============================================================================================================
830 // Parsing of properties (-D)
831
832 const char* Arguments::get_property(const char* key) {
833 return PropertyList_get_value(system_properties(), key);
834 }
835
836 bool Arguments::add_property(const char* prop) {
837 const char* eq = strchr(prop, '=');
838 char* key;
839 // ns must be static--its address may be stored in a SystemProperty object.
840 const static char ns[1] = {0};
841 char* value = (char *)ns;
842
843 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
844 key = AllocateHeap(key_len + 1, "add_property");
845 strncpy(key, prop, key_len);
846 key[key_len] = '\0';
847
848 if (eq != NULL) {
849 size_t value_len = strlen(prop) - key_len - 1;
850 value = AllocateHeap(value_len + 1, "add_property");
851 strncpy(value, &prop[key_len + 1], value_len + 1);
852 }
853
854 if (strcmp(key, "java.compiler") == 0) {
855 process_java_compiler_argument(value);
856 FreeHeap(key);
857 if (eq != NULL) {
858 FreeHeap(value);
859 }
860 return true;
861 } else if (strcmp(key, "sun.java.command") == 0) {
862 _java_command = value;
863
864 // don't add this property to the properties exposed to the java application
865 FreeHeap(key);
866 return true;
867 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
868 // launcher.pid property is private and is processed
869 // in process_sun_java_launcher_properties();
870 // the sun.java.launcher property is passed on to the java application
871 FreeHeap(key);
872 if (eq != NULL) {
873 FreeHeap(value);
874 }
875 return true;
876 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
877 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
878 // its value without going through the property list or making a Java call.
879 _java_vendor_url_bug = value;
880 } else if (strcmp(key, "sun.boot.library.path") == 0) {
881 PropertyList_unique_add(&_system_properties, key, value, true);
882 return true;
883 }
884 // Create new property and add at the end of the list
885 PropertyList_unique_add(&_system_properties, key, value);
886 return true;
887 }
888
889 //===========================================================================================================
890 // Setting int/mixed/comp mode flags
891
892 void Arguments::set_mode_flags(Mode mode) {
893 // Set up default values for all flags.
894 // If you add a flag to any of the branches below,
895 // add a default value for it here.
896 set_java_compiler(false);
897 _mode = mode;
898
899 // Ensure Agent_OnLoad has the correct initial values.
900 // This may not be the final mode; mode may change later in onload phase.
901 PropertyList_unique_add(&_system_properties, "java.vm.info",
902 (char*)Abstract_VM_Version::vm_info_string(), false);
903
904 UseInterpreter = true;
905 UseCompiler = true;
906 UseLoopCounter = true;
907
908 // Default values may be platform/compiler dependent -
909 // use the saved values
910 ClipInlining = Arguments::_ClipInlining;
911 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
912 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
913 BackgroundCompilation = Arguments::_BackgroundCompilation;
914 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
915
916 // Change from defaults based on mode
917 switch (mode) {
918 default:
919 ShouldNotReachHere();
920 break;
921 case _int:
922 UseCompiler = false;
923 UseLoopCounter = false;
924 AlwaysCompileLoopMethods = false;
925 UseOnStackReplacement = false;
926 break;
927 case _mixed:
928 // same as default
929 break;
930 case _comp:
931 UseInterpreter = false;
932 BackgroundCompilation = false;
933 ClipInlining = false;
934 break;
935 }
936 }
937
938 // Conflict: required to use shared spaces (-Xshare:on), but
939 // incompatible command line options were chosen.
940
941 static void no_shared_spaces() {
942 if (RequireSharedSpaces) {
943 jio_fprintf(defaultStream::error_stream(),
944 "Class data sharing is inconsistent with other specified options.\n");
945 vm_exit_during_initialization("Unable to use shared archive.", NULL);
946 } else {
947 FLAG_SET_DEFAULT(UseSharedSpaces, false);
948 }
949 }
950
951 #ifndef KERNEL
952 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
953 // if it's not explictly set or unset. If the user has chosen
954 // UseParNewGC and not explicitly set ParallelGCThreads we
955 // set it, unless this is a single cpu machine.
956 void Arguments::set_parnew_gc_flags() {
957 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
958 "control point invariant");
959 assert(UseParNewGC, "Error");
960
961 // Turn off AdaptiveSizePolicy by default for parnew until it is
962 // complete.
963 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
964 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
965 }
966
967 if (ParallelGCThreads == 0) {
968 FLAG_SET_DEFAULT(ParallelGCThreads,
969 Abstract_VM_Version::parallel_worker_threads());
970 if (ParallelGCThreads == 1) {
971 FLAG_SET_DEFAULT(UseParNewGC, false);
972 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
973 }
974 }
975 if (UseParNewGC) {
976 // CDS doesn't work with ParNew yet
977 no_shared_spaces();
978
979 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
980 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
981 // we set them to 1024 and 1024.
982 // See CR 6362902.
983 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
984 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
985 }
986 if (FLAG_IS_DEFAULT(OldPLABSize)) {
987 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
988 }
989
990 // AlwaysTenure flag should make ParNew promote all at first collection.
991 // See CR 6362902.
992 if (AlwaysTenure) {
993 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
994 }
995 // When using compressed oops, we use local overflow stacks,
996 // rather than using a global overflow list chained through
997 // the klass word of the object's pre-image.
998 if (UseCompressedOops && !ParGCUseLocalOverflow) {
999 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1000 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1001 }
1002 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1003 }
1004 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1005 }
1006 }
1007
1008 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1009 // sparc/solaris for certain applications, but would gain from
1010 // further optimization and tuning efforts, and would almost
1011 // certainly gain from analysis of platform and environment.
1012 void Arguments::set_cms_and_parnew_gc_flags() {
1013 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1014 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1015
1016 // If we are using CMS, we prefer to UseParNewGC,
1017 // unless explicitly forbidden.
1018 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1019 FLAG_SET_ERGO(bool, UseParNewGC, true);
1020 }
1021
1022 // Turn off AdaptiveSizePolicy by default for cms until it is
1023 // complete.
1024 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1025 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1026 }
1027
1028 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1029 // as needed.
1030 if (UseParNewGC) {
1031 set_parnew_gc_flags();
1032 }
1033
1034 // Now make adjustments for CMS
1035 size_t young_gen_per_worker;
1036 intx new_ratio;
1037 size_t min_new_default;
1038 intx tenuring_default;
1039 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1040 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1041 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1042 }
1043 young_gen_per_worker = 4*M;
1044 new_ratio = (intx)15;
1045 min_new_default = 4*M;
1046 tenuring_default = (intx)0;
1047 } else { // new defaults: "new" as of 6.0
1048 young_gen_per_worker = CMSYoungGenPerWorker;
1049 new_ratio = (intx)7;
1050 min_new_default = 16*M;
1051 tenuring_default = (intx)4;
1052 }
1053
1054 // Preferred young gen size for "short" pauses
1055 const uintx parallel_gc_threads =
1056 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1057 const size_t preferred_max_new_size_unaligned =
1058 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1059 const size_t preferred_max_new_size =
1060 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1061
1062 // Unless explicitly requested otherwise, size young gen
1063 // for "short" pauses ~ 4M*ParallelGCThreads
1064
1065 // If either MaxNewSize or NewRatio is set on the command line,
1066 // assume the user is trying to set the size of the young gen.
1067
1068 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1069
1070 // Set MaxNewSize to our calculated preferred_max_new_size unless
1071 // NewSize was set on the command line and it is larger than
1072 // preferred_max_new_size.
1073 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1074 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1075 } else {
1076 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1077 }
1078 if (PrintGCDetails && Verbose) {
1079 // Too early to use gclog_or_tty
1080 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1081 }
1082
1083 // Unless explicitly requested otherwise, prefer a large
1084 // Old to Young gen size so as to shift the collection load
1085 // to the old generation concurrent collector
1086
1087 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1088 // then NewSize and OldSize may be calculated. That would
1089 // generally lead to some differences with ParNewGC for which
1090 // there was no obvious reason. Also limit to the case where
1091 // MaxNewSize has not been set.
1092
1093 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1094
1095 // Code along this path potentially sets NewSize and OldSize
1096
1097 // Calculate the desired minimum size of the young gen but if
1098 // NewSize has been set on the command line, use it here since
1099 // it should be the final value.
1100 size_t min_new;
1101 if (FLAG_IS_DEFAULT(NewSize)) {
1102 min_new = align_size_up(ScaleForWordSize(min_new_default),
1103 os::vm_page_size());
1104 } else {
1105 min_new = NewSize;
1106 }
1107 size_t prev_initial_size = InitialHeapSize;
1108 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1109 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1110 // Currently minimum size and the initial heap sizes are the same.
1111 set_min_heap_size(InitialHeapSize);
1112 if (PrintGCDetails && Verbose) {
1113 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1114 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1115 InitialHeapSize/M, prev_initial_size/M);
1116 }
1117 }
1118
1119 // MaxHeapSize is aligned down in collectorPolicy
1120 size_t max_heap =
1121 align_size_down(MaxHeapSize,
1122 CardTableRS::ct_max_alignment_constraint());
1123
1124 if (PrintGCDetails && Verbose) {
1125 // Too early to use gclog_or_tty
1126 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1127 " initial_heap_size: " SIZE_FORMAT
1128 " max_heap: " SIZE_FORMAT,
1129 min_heap_size(), InitialHeapSize, max_heap);
1130 }
1131 if (max_heap > min_new) {
1132 // Unless explicitly requested otherwise, make young gen
1133 // at least min_new, and at most preferred_max_new_size.
1134 if (FLAG_IS_DEFAULT(NewSize)) {
1135 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1136 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1137 if (PrintGCDetails && Verbose) {
1138 // Too early to use gclog_or_tty
1139 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1140 }
1141 }
1142 // Unless explicitly requested otherwise, size old gen
1143 // so that it's at least 3X of NewSize to begin with;
1144 // later NewRatio will decide how it grows; see above.
1145 if (FLAG_IS_DEFAULT(OldSize)) {
1146 if (max_heap > NewSize) {
1147 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1148 if (PrintGCDetails && Verbose) {
1149 // Too early to use gclog_or_tty
1150 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1151 }
1152 }
1153 }
1154 }
1155 }
1156 // Unless explicitly requested otherwise, definitely
1157 // promote all objects surviving "tenuring_default" scavenges.
1158 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1159 FLAG_IS_DEFAULT(SurvivorRatio)) {
1160 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1161 }
1162 // If we decided above (or user explicitly requested)
1163 // `promote all' (via MaxTenuringThreshold := 0),
1164 // prefer minuscule survivor spaces so as not to waste
1165 // space for (non-existent) survivors
1166 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1167 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1168 }
1169 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1170 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1171 // This is done in order to make ParNew+CMS configuration to work
1172 // with YoungPLABSize and OldPLABSize options.
1173 // See CR 6362902.
1174 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1175 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1176 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1177 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1178 // the value (either from the command line or ergonomics) of
1179 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1180 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1181 } else {
1182 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1183 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1184 // we'll let it to take precedence.
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1187 " options are specified for the CMS collector."
1188 " CMSParPromoteBlocksToClaim will take precedence.\n");
1189 }
1190 }
1191 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1192 // OldPLAB sizing manually turned off: Use a larger default setting,
1193 // unless it was manually specified. This is because a too-low value
1194 // will slow down scavenges.
1195 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1196 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1197 }
1198 }
1199 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1200 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1201 // If either of the static initialization defaults have changed, note this
1202 // modification.
1203 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1204 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1205 }
1206 if (PrintGCDetails && Verbose) {
1207 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1208 MarkStackSize / K, MarkStackSizeMax / K);
1209 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1210 }
1211 }
1212 #endif // KERNEL
1213
1214 void set_object_alignment() {
1215 // Object alignment.
1216 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1217 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1218 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1219 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1220 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1221 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1222
1223 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1224 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1225
1226 // Oop encoding heap max
1227 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1228
1229 #ifndef KERNEL
1230 // Set CMS global values
1231 CompactibleFreeListSpace::set_cms_values();
1232 #endif // KERNEL
1233 }
1234
1235 bool verify_object_alignment() {
1236 // Object alignment.
1237 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1238 jio_fprintf(defaultStream::error_stream(),
1239 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes);
1240 return false;
1241 }
1242 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1243 jio_fprintf(defaultStream::error_stream(),
1244 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong);
1245 return false;
1246 }
1247 return true;
1248 }
1249
1250 inline uintx max_heap_for_compressed_oops() {
1251 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1252 NOT_LP64(ShouldNotReachHere(); return 0);
1253 }
1254
1255 bool Arguments::should_auto_select_low_pause_collector() {
1256 if (UseAutoGCSelectPolicy &&
1257 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1258 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1259 if (PrintGCDetails) {
1260 // Cannot use gclog_or_tty yet.
1261 tty->print_cr("Automatic selection of the low pause collector"
1262 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1263 }
1264 return true;
1265 }
1266 return false;
1267 }
1268
1269 void Arguments::set_ergonomics_flags() {
1270 // Parallel GC is not compatible with sharing. If one specifies
1271 // that they want sharing explicitly, do not set ergonomics flags.
1272 if (DumpSharedSpaces || ForceSharedSpaces) {
1273 return;
1274 }
1275
1276 if (os::is_server_class_machine() && !force_client_mode ) {
1277 // If no other collector is requested explicitly,
1278 // let the VM select the collector based on
1279 // machine class and automatic selection policy.
1280 if (!UseSerialGC &&
1281 !UseConcMarkSweepGC &&
1282 !UseG1GC &&
1283 !UseParNewGC &&
1284 !DumpSharedSpaces &&
1285 FLAG_IS_DEFAULT(UseParallelGC)) {
1286 if (should_auto_select_low_pause_collector()) {
1287 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1288 } else {
1289 FLAG_SET_ERGO(bool, UseParallelGC, true);
1290 }
1291 no_shared_spaces();
1292 }
1293 }
1294
1295 #ifndef ZERO
1296 #ifdef _LP64
1297 // Check that UseCompressedOops can be set with the max heap size allocated
1298 // by ergonomics.
1299 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1300 #ifndef COMPILER1
1301 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1302 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1303 }
1304 #endif
1305 #ifdef _WIN64
1306 if (UseLargePages && UseCompressedOops) {
1307 // Cannot allocate guard pages for implicit checks in indexed addressing
1308 // mode, when large pages are specified on windows.
1309 // This flag could be switched ON if narrow oop base address is set to 0,
1310 // see code in Universe::initialize_heap().
1311 Universe::set_narrow_oop_use_implicit_null_checks(false);
1312 }
1313 #endif // _WIN64
1314 } else {
1315 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1316 warning("Max heap size too large for Compressed Oops");
1317 FLAG_SET_DEFAULT(UseCompressedOops, false);
1318 }
1319 }
1320 // Also checks that certain machines are slower with compressed oops
1321 // in vm_version initialization code.
1322 #endif // _LP64
1323 #endif // !ZERO
1324 }
1325
1326 void Arguments::set_parallel_gc_flags() {
1327 assert(UseParallelGC || UseParallelOldGC, "Error");
1328 // If parallel old was requested, automatically enable parallel scavenge.
1329 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1330 FLAG_SET_DEFAULT(UseParallelGC, true);
1331 }
1332
1333 // If no heap maximum was requested explicitly, use some reasonable fraction
1334 // of the physical memory, up to a maximum of 1GB.
1335 if (UseParallelGC) {
1336 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1337 Abstract_VM_Version::parallel_worker_threads());
1338
1339 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1340 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1341 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1342 // See CR 6362902 for details.
1343 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1345 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1346 }
1347 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1348 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1349 }
1350 }
1351
1352 if (UseParallelOldGC) {
1353 // Par compact uses lower default values since they are treated as
1354 // minimums. These are different defaults because of the different
1355 // interpretation and are not ergonomically set.
1356 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1357 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1358 }
1359 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1360 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1361 }
1362 }
1363 }
1364 }
1365
1366 void Arguments::set_g1_gc_flags() {
1367 assert(UseG1GC, "Error");
1368 #ifdef COMPILER1
1369 FastTLABRefill = false;
1370 #endif
1371 FLAG_SET_DEFAULT(ParallelGCThreads,
1372 Abstract_VM_Version::parallel_worker_threads());
1373 if (ParallelGCThreads == 0) {
1374 FLAG_SET_DEFAULT(ParallelGCThreads,
1375 Abstract_VM_Version::parallel_worker_threads());
1376 }
1377 no_shared_spaces();
1378
1379 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1380 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1381 }
1382 if (PrintGCDetails && Verbose) {
1383 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1384 MarkStackSize / K, MarkStackSizeMax / K);
1385 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1386 }
1387
1388 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1389 // In G1, we want the default GC overhead goal to be higher than
1390 // say in PS. So we set it here to 10%. Otherwise the heap might
1391 // be expanded more aggressively than we would like it to. In
1392 // fact, even 10% seems to not be high enough in some cases
1393 // (especially small GC stress tests that the main thing they do
1394 // is allocation). We might consider increase it further.
1395 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1396 }
1397 }
1398
1399 void Arguments::set_heap_size() {
1400 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1401 // Deprecated flag
1402 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1403 }
1404
1405 const julong phys_mem =
1406 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1407 : (julong)MaxRAM;
1408
1409 // If the maximum heap size has not been set with -Xmx,
1410 // then set it as fraction of the size of physical memory,
1411 // respecting the maximum and minimum sizes of the heap.
1412 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1413 julong reasonable_max = phys_mem / MaxRAMFraction;
1414
1415 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1416 // Small physical memory, so use a minimum fraction of it for the heap
1417 reasonable_max = phys_mem / MinRAMFraction;
1418 } else {
1419 // Not-small physical memory, so require a heap at least
1420 // as large as MaxHeapSize
1421 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1422 }
1423 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1424 // Limit the heap size to ErgoHeapSizeLimit
1425 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1426 }
1427 if (UseCompressedOops) {
1428 // Limit the heap size to the maximum possible when using compressed oops
1429 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1430 }
1431 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1432
1433 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1434 // An initial heap size was specified on the command line,
1435 // so be sure that the maximum size is consistent. Done
1436 // after call to allocatable_physical_memory because that
1437 // method might reduce the allocation size.
1438 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1439 }
1440
1441 if (PrintGCDetails && Verbose) {
1442 // Cannot use gclog_or_tty yet.
1443 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1444 }
1445 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1446 }
1447
1448 // If the initial_heap_size has not been set with InitialHeapSize
1449 // or -Xms, then set it as fraction of the size of physical memory,
1450 // respecting the maximum and minimum sizes of the heap.
1451 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1452 julong reasonable_minimum = (julong)(OldSize + NewSize);
1453
1454 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1455
1456 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1457
1458 julong reasonable_initial = phys_mem / InitialRAMFraction;
1459
1460 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1461 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1462
1463 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1464
1465 if (PrintGCDetails && Verbose) {
1466 // Cannot use gclog_or_tty yet.
1467 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1468 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1469 }
1470 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1471 set_min_heap_size((uintx)reasonable_minimum);
1472 }
1473 }
1474
1475 // This must be called after ergonomics because we want bytecode rewriting
1476 // if the server compiler is used, or if UseSharedSpaces is disabled.
1477 void Arguments::set_bytecode_flags() {
1478 // Better not attempt to store into a read-only space.
1479 if (UseSharedSpaces) {
1480 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1481 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1482 }
1483
1484 if (!RewriteBytecodes) {
1485 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1486 }
1487 }
1488
1489 // Aggressive optimization flags -XX:+AggressiveOpts
1490 void Arguments::set_aggressive_opts_flags() {
1491 #ifdef COMPILER2
1492 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1493 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1494 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1495 }
1496 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1497 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1498 }
1499
1500 // Feed the cache size setting into the JDK
1501 char buffer[1024];
1502 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1503 add_property(buffer);
1504 }
1505 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1506 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1507 }
1508 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1509 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1510 }
1511 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1512 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1513 }
1514 #endif
1515
1516 if (AggressiveOpts) {
1517 // Sample flag setting code
1518 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1519 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1520 // }
1521 }
1522 }
1523
1524 //===========================================================================================================
1525 // Parsing of java.compiler property
1526
1527 void Arguments::process_java_compiler_argument(char* arg) {
1528 // For backwards compatibility, Djava.compiler=NONE or ""
1529 // causes us to switch to -Xint mode UNLESS -Xdebug
1530 // is also specified.
1531 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1532 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1533 }
1534 }
1535
1536 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1537 _sun_java_launcher = strdup(launcher);
1538 }
1539
1540 bool Arguments::created_by_java_launcher() {
1541 assert(_sun_java_launcher != NULL, "property must have value");
1542 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1543 }
1544
1545 //===========================================================================================================
1546 // Parsing of main arguments
1547
1548 bool Arguments::verify_interval(uintx val, uintx min,
1549 uintx max, const char* name) {
1550 // Returns true iff value is in the inclusive interval [min..max]
1551 // false, otherwise.
1552 if (val >= min && val <= max) {
1553 return true;
1554 }
1555 jio_fprintf(defaultStream::error_stream(),
1556 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1557 " and " UINTX_FORMAT "\n",
1558 name, val, min, max);
1559 return false;
1560 }
1561
1562 bool Arguments::verify_percentage(uintx value, const char* name) {
1563 if (value <= 100) {
1564 return true;
1565 }
1566 jio_fprintf(defaultStream::error_stream(),
1567 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1568 name, value);
1569 return false;
1570 }
1571
1572 static void force_serial_gc() {
1573 FLAG_SET_DEFAULT(UseSerialGC, true);
1574 FLAG_SET_DEFAULT(UseParNewGC, false);
1575 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1576 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1577 FLAG_SET_DEFAULT(UseParallelGC, false);
1578 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1579 FLAG_SET_DEFAULT(UseG1GC, false);
1580 }
1581
1582 static bool verify_serial_gc_flags() {
1583 return (UseSerialGC &&
1584 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1585 UseParallelGC || UseParallelOldGC));
1586 }
1587
1588 // Check consistency of GC selection
1589 bool Arguments::check_gc_consistency() {
1590 bool status = true;
1591 // Ensure that the user has not selected conflicting sets
1592 // of collectors. [Note: this check is merely a user convenience;
1593 // collectors over-ride each other so that only a non-conflicting
1594 // set is selected; however what the user gets is not what they
1595 // may have expected from the combination they asked for. It's
1596 // better to reduce user confusion by not allowing them to
1597 // select conflicting combinations.
1598 uint i = 0;
1599 if (UseSerialGC) i++;
1600 if (UseConcMarkSweepGC || UseParNewGC) i++;
1601 if (UseParallelGC || UseParallelOldGC) i++;
1602 if (UseG1GC) i++;
1603 if (i > 1) {
1604 jio_fprintf(defaultStream::error_stream(),
1605 "Conflicting collector combinations in option list; "
1606 "please refer to the release notes for the combinations "
1607 "allowed\n");
1608 status = false;
1609 }
1610
1611 return status;
1612 }
1613
1614 // Check the consistency of vm_init_args
1615 bool Arguments::check_vm_args_consistency() {
1616 // Method for adding checks for flag consistency.
1617 // The intent is to warn the user of all possible conflicts,
1618 // before returning an error.
1619 // Note: Needs platform-dependent factoring.
1620 bool status = true;
1621
1622 #if ( (defined(COMPILER2) && defined(SPARC)))
1623 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1624 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1625 // x86. Normally, VM_Version_init must be called from init_globals in
1626 // init.cpp, which is called by the initial java thread *after* arguments
1627 // have been parsed. VM_Version_init gets called twice on sparc.
1628 extern void VM_Version_init();
1629 VM_Version_init();
1630 if (!VM_Version::has_v9()) {
1631 jio_fprintf(defaultStream::error_stream(),
1632 "V8 Machine detected, Server requires V9\n");
1633 status = false;
1634 }
1635 #endif /* COMPILER2 && SPARC */
1636
1637 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1638 // builds so the cost of stack banging can be measured.
1639 #if (defined(PRODUCT) && defined(SOLARIS))
1640 if (!UseBoundThreads && !UseStackBanging) {
1641 jio_fprintf(defaultStream::error_stream(),
1642 "-UseStackBanging conflicts with -UseBoundThreads\n");
1643
1644 status = false;
1645 }
1646 #endif
1647
1648 if (TLABRefillWasteFraction == 0) {
1649 jio_fprintf(defaultStream::error_stream(),
1650 "TLABRefillWasteFraction should be a denominator, "
1651 "not " SIZE_FORMAT "\n",
1652 TLABRefillWasteFraction);
1653 status = false;
1654 }
1655
1656 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1657 "MaxLiveObjectEvacuationRatio");
1658 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1659 "AdaptiveSizePolicyWeight");
1660 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1661 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1662 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1663 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1664
1665 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1666 jio_fprintf(defaultStream::error_stream(),
1667 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1668 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1669 MinHeapFreeRatio, MaxHeapFreeRatio);
1670 status = false;
1671 }
1672 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1673 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1674
1675 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1676 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1677 }
1678
1679 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1680 // Settings to encourage splitting.
1681 if (!FLAG_IS_CMDLINE(NewRatio)) {
1682 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1683 }
1684 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1685 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1686 }
1687 }
1688
1689 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1690 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1691 if (GCTimeLimit == 100) {
1692 // Turn off gc-overhead-limit-exceeded checks
1693 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1694 }
1695
1696 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1697
1698 // Check whether user-specified sharing option conflicts with GC or page size.
1699 // Both sharing and large pages are enabled by default on some platforms;
1700 // large pages override sharing only if explicitly set on the command line.
1701 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1702 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1703 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1704 if (cannot_share) {
1705 // Either force sharing on by forcing the other options off, or
1706 // force sharing off.
1707 if (DumpSharedSpaces || ForceSharedSpaces) {
1708 jio_fprintf(defaultStream::error_stream(),
1709 "Using Serial GC and default page size because of %s\n",
1710 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1711 force_serial_gc();
1712 FLAG_SET_DEFAULT(UseLargePages, false);
1713 } else {
1714 if (UseSharedSpaces && Verbose) {
1715 jio_fprintf(defaultStream::error_stream(),
1716 "Turning off use of shared archive because of "
1717 "choice of garbage collector or large pages\n");
1718 }
1719 no_shared_spaces();
1720 }
1721 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1722 FLAG_SET_DEFAULT(UseLargePages, false);
1723 }
1724
1725 status = status && check_gc_consistency();
1726
1727 if (_has_alloc_profile) {
1728 if (UseParallelGC || UseParallelOldGC) {
1729 jio_fprintf(defaultStream::error_stream(),
1730 "error: invalid argument combination.\n"
1731 "Allocation profiling (-Xaprof) cannot be used together with "
1732 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1733 status = false;
1734 }
1735 if (UseConcMarkSweepGC) {
1736 jio_fprintf(defaultStream::error_stream(),
1737 "error: invalid argument combination.\n"
1738 "Allocation profiling (-Xaprof) cannot be used together with "
1739 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1740 status = false;
1741 }
1742 }
1743
1744 if (CMSIncrementalMode) {
1745 if (!UseConcMarkSweepGC) {
1746 jio_fprintf(defaultStream::error_stream(),
1747 "error: invalid argument combination.\n"
1748 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1749 "selected in order\nto use CMSIncrementalMode.\n");
1750 status = false;
1751 } else {
1752 status = status && verify_percentage(CMSIncrementalDutyCycle,
1753 "CMSIncrementalDutyCycle");
1754 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1755 "CMSIncrementalDutyCycleMin");
1756 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1757 "CMSIncrementalSafetyFactor");
1758 status = status && verify_percentage(CMSIncrementalOffset,
1759 "CMSIncrementalOffset");
1760 status = status && verify_percentage(CMSExpAvgFactor,
1761 "CMSExpAvgFactor");
1762 // If it was not set on the command line, set
1763 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1764 if (CMSInitiatingOccupancyFraction < 0) {
1765 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1766 }
1767 }
1768 }
1769
1770 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1771 // insists that we hold the requisite locks so that the iteration is
1772 // MT-safe. For the verification at start-up and shut-down, we don't
1773 // yet have a good way of acquiring and releasing these locks,
1774 // which are not visible at the CollectedHeap level. We want to
1775 // be able to acquire these locks and then do the iteration rather
1776 // than just disable the lock verification. This will be fixed under
1777 // bug 4788986.
1778 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1779 if (VerifyGCStartAt == 0) {
1780 warning("Heap verification at start-up disabled "
1781 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1782 VerifyGCStartAt = 1; // Disable verification at start-up
1783 }
1784 if (VerifyBeforeExit) {
1785 warning("Heap verification at shutdown disabled "
1786 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1787 VerifyBeforeExit = false; // Disable verification at shutdown
1788 }
1789 }
1790
1791 // Note: only executed in non-PRODUCT mode
1792 if (!UseAsyncConcMarkSweepGC &&
1793 (ExplicitGCInvokesConcurrent ||
1794 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1795 jio_fprintf(defaultStream::error_stream(),
1796 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1797 " with -UseAsyncConcMarkSweepGC");
1798 status = false;
1799 }
1800
1801 if (UseG1GC) {
1802 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1803 "InitiatingHeapOccupancyPercent");
1804 }
1805
1806 status = status && verify_interval(RefDiscoveryPolicy,
1807 ReferenceProcessor::DiscoveryPolicyMin,
1808 ReferenceProcessor::DiscoveryPolicyMax,
1809 "RefDiscoveryPolicy");
1810
1811 // Limit the lower bound of this flag to 1 as it is used in a division
1812 // expression.
1813 status = status && verify_interval(TLABWasteTargetPercent,
1814 1, 100, "TLABWasteTargetPercent");
1815
1816 status = status && verify_object_alignment();
1817
1818 return status;
1819 }
1820
1821 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1822 const char* option_type) {
1823 if (ignore) return false;
1824
1825 const char* spacer = " ";
1826 if (option_type == NULL) {
1827 option_type = ++spacer; // Set both to the empty string.
1828 }
1829
1830 if (os::obsolete_option(option)) {
1831 jio_fprintf(defaultStream::error_stream(),
1832 "Obsolete %s%soption: %s\n", option_type, spacer,
1833 option->optionString);
1834 return false;
1835 } else {
1836 jio_fprintf(defaultStream::error_stream(),
1837 "Unrecognized %s%soption: %s\n", option_type, spacer,
1838 option->optionString);
1839 return true;
1840 }
1841 }
1842
1843 static const char* user_assertion_options[] = {
1844 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1845 };
1846
1847 static const char* system_assertion_options[] = {
1848 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1849 };
1850
1851 // Return true if any of the strings in null-terminated array 'names' matches.
1852 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1853 // the option must match exactly.
1854 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1855 bool tail_allowed) {
1856 for (/* empty */; *names != NULL; ++names) {
1857 if (match_option(option, *names, tail)) {
1858 if (**tail == '\0' || tail_allowed && **tail == ':') {
1859 return true;
1860 }
1861 }
1862 }
1863 return false;
1864 }
1865
1866 bool Arguments::parse_uintx(const char* value,
1867 uintx* uintx_arg,
1868 uintx min_size) {
1869
1870 // Check the sign first since atomull() parses only unsigned values.
1871 bool value_is_positive = !(*value == '-');
1872
1873 if (value_is_positive) {
1874 julong n;
1875 bool good_return = atomull(value, &n);
1876 if (good_return) {
1877 bool above_minimum = n >= min_size;
1878 bool value_is_too_large = n > max_uintx;
1879
1880 if (above_minimum && !value_is_too_large) {
1881 *uintx_arg = n;
1882 return true;
1883 }
1884 }
1885 }
1886 return false;
1887 }
1888
1889 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1890 julong* long_arg,
1891 julong min_size) {
1892 if (!atomull(s, long_arg)) return arg_unreadable;
1893 return check_memory_size(*long_arg, min_size);
1894 }
1895
1896 // Parse JavaVMInitArgs structure
1897
1898 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1899 // For components of the system classpath.
1900 SysClassPath scp(Arguments::get_sysclasspath());
1901 bool scp_assembly_required = false;
1902
1903 // Save default settings for some mode flags
1904 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1905 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1906 Arguments::_ClipInlining = ClipInlining;
1907 Arguments::_BackgroundCompilation = BackgroundCompilation;
1908 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1909
1910 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1911 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1912 if (result != JNI_OK) {
1913 return result;
1914 }
1915
1916 // Parse JavaVMInitArgs structure passed in
1917 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1918 if (result != JNI_OK) {
1919 return result;
1920 }
1921
1922 if (AggressiveOpts) {
1923 // Insert alt-rt.jar between user-specified bootclasspath
1924 // prefix and the default bootclasspath. os::set_boot_path()
1925 // uses meta_index_dir as the default bootclasspath directory.
1926 const char* altclasses_jar = "alt-rt.jar";
1927 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1928 strlen(altclasses_jar);
1929 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1930 strcpy(altclasses_path, get_meta_index_dir());
1931 strcat(altclasses_path, altclasses_jar);
1932 scp.add_suffix_to_prefix(altclasses_path);
1933 scp_assembly_required = true;
1934 FREE_C_HEAP_ARRAY(char, altclasses_path);
1935 }
1936
1937 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1938 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1939 if (result != JNI_OK) {
1940 return result;
1941 }
1942
1943 // Do final processing now that all arguments have been parsed
1944 result = finalize_vm_init_args(&scp, scp_assembly_required);
1945 if (result != JNI_OK) {
1946 return result;
1947 }
1948
1949 return JNI_OK;
1950 }
1951
1952 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1953 SysClassPath* scp_p,
1954 bool* scp_assembly_required_p,
1955 FlagValueOrigin origin) {
1956 // Remaining part of option string
1957 const char* tail;
1958
1959 // iterate over arguments
1960 for (int index = 0; index < args->nOptions; index++) {
1961 bool is_absolute_path = false; // for -agentpath vs -agentlib
1962
1963 const JavaVMOption* option = args->options + index;
1964
1965 if (!match_option(option, "-Djava.class.path", &tail) &&
1966 !match_option(option, "-Dsun.java.command", &tail) &&
1967 !match_option(option, "-Dsun.java.launcher", &tail)) {
1968
1969 // add all jvm options to the jvm_args string. This string
1970 // is used later to set the java.vm.args PerfData string constant.
1971 // the -Djava.class.path and the -Dsun.java.command options are
1972 // omitted from jvm_args string as each have their own PerfData
1973 // string constant object.
1974 build_jvm_args(option->optionString);
1975 }
1976
1977 // -verbose:[class/gc/jni]
1978 if (match_option(option, "-verbose", &tail)) {
1979 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1980 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1981 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1982 } else if (!strcmp(tail, ":gc")) {
1983 FLAG_SET_CMDLINE(bool, PrintGC, true);
1984 } else if (!strcmp(tail, ":jni")) {
1985 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1986 }
1987 // -da / -ea / -disableassertions / -enableassertions
1988 // These accept an optional class/package name separated by a colon, e.g.,
1989 // -da:java.lang.Thread.
1990 } else if (match_option(option, user_assertion_options, &tail, true)) {
1991 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1992 if (*tail == '\0') {
1993 JavaAssertions::setUserClassDefault(enable);
1994 } else {
1995 assert(*tail == ':', "bogus match by match_option()");
1996 JavaAssertions::addOption(tail + 1, enable);
1997 }
1998 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1999 } else if (match_option(option, system_assertion_options, &tail, false)) {
2000 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2001 JavaAssertions::setSystemClassDefault(enable);
2002 // -bootclasspath:
2003 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2004 scp_p->reset_path(tail);
2005 *scp_assembly_required_p = true;
2006 // -bootclasspath/a:
2007 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2008 scp_p->add_suffix(tail);
2009 *scp_assembly_required_p = true;
2010 // -bootclasspath/p:
2011 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2012 scp_p->add_prefix(tail);
2013 *scp_assembly_required_p = true;
2014 // -Xrun
2015 } else if (match_option(option, "-Xrun", &tail)) {
2016 if (tail != NULL) {
2017 const char* pos = strchr(tail, ':');
2018 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2019 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2020 name[len] = '\0';
2021
2022 char *options = NULL;
2023 if(pos != NULL) {
2024 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2025 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2026 }
2027 #ifdef JVMTI_KERNEL
2028 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2029 warning("profiling and debugging agents are not supported with Kernel VM");
2030 } else
2031 #endif // JVMTI_KERNEL
2032 add_init_library(name, options);
2033 }
2034 // -agentlib and -agentpath
2035 } else if (match_option(option, "-agentlib:", &tail) ||
2036 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2037 if(tail != NULL) {
2038 const char* pos = strchr(tail, '=');
2039 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2040 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2041 name[len] = '\0';
2042
2043 char *options = NULL;
2044 if(pos != NULL) {
2045 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2046 }
2047 #ifdef JVMTI_KERNEL
2048 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2049 warning("profiling and debugging agents are not supported with Kernel VM");
2050 } else
2051 #endif // JVMTI_KERNEL
2052 add_init_agent(name, options, is_absolute_path);
2053
2054 }
2055 // -javaagent
2056 } else if (match_option(option, "-javaagent:", &tail)) {
2057 if(tail != NULL) {
2058 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2059 add_init_agent("instrument", options, false);
2060 }
2061 // -Xnoclassgc
2062 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2063 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2064 // -Xincgc: i-CMS
2065 } else if (match_option(option, "-Xincgc", &tail)) {
2066 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2067 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2068 // -Xnoincgc: no i-CMS
2069 } else if (match_option(option, "-Xnoincgc", &tail)) {
2070 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2071 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2072 // -Xconcgc
2073 } else if (match_option(option, "-Xconcgc", &tail)) {
2074 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2075 // -Xnoconcgc
2076 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2077 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2078 // -Xbatch
2079 } else if (match_option(option, "-Xbatch", &tail)) {
2080 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2081 // -Xmn for compatibility with other JVM vendors
2082 } else if (match_option(option, "-Xmn", &tail)) {
2083 julong long_initial_eden_size = 0;
2084 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2085 if (errcode != arg_in_range) {
2086 jio_fprintf(defaultStream::error_stream(),
2087 "Invalid initial eden size: %s\n", option->optionString);
2088 describe_range_error(errcode);
2089 return JNI_EINVAL;
2090 }
2091 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2092 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2093 // -Xms
2094 } else if (match_option(option, "-Xms", &tail)) {
2095 julong long_initial_heap_size = 0;
2096 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2097 if (errcode != arg_in_range) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "Invalid initial heap size: %s\n", option->optionString);
2100 describe_range_error(errcode);
2101 return JNI_EINVAL;
2102 }
2103 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2104 // Currently the minimum size and the initial heap sizes are the same.
2105 set_min_heap_size(InitialHeapSize);
2106 // -Xmx
2107 } else if (match_option(option, "-Xmx", &tail)) {
2108 julong long_max_heap_size = 0;
2109 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2110 if (errcode != arg_in_range) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Invalid maximum heap size: %s\n", option->optionString);
2113 describe_range_error(errcode);
2114 return JNI_EINVAL;
2115 }
2116 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2117 // Xmaxf
2118 } else if (match_option(option, "-Xmaxf", &tail)) {
2119 int maxf = (int)(atof(tail) * 100);
2120 if (maxf < 0 || maxf > 100) {
2121 jio_fprintf(defaultStream::error_stream(),
2122 "Bad max heap free percentage size: %s\n",
2123 option->optionString);
2124 return JNI_EINVAL;
2125 } else {
2126 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2127 }
2128 // Xminf
2129 } else if (match_option(option, "-Xminf", &tail)) {
2130 int minf = (int)(atof(tail) * 100);
2131 if (minf < 0 || minf > 100) {
2132 jio_fprintf(defaultStream::error_stream(),
2133 "Bad min heap free percentage size: %s\n",
2134 option->optionString);
2135 return JNI_EINVAL;
2136 } else {
2137 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2138 }
2139 // -Xss
2140 } else if (match_option(option, "-Xss", &tail)) {
2141 julong long_ThreadStackSize = 0;
2142 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2143 if (errcode != arg_in_range) {
2144 jio_fprintf(defaultStream::error_stream(),
2145 "Invalid thread stack size: %s\n", option->optionString);
2146 describe_range_error(errcode);
2147 return JNI_EINVAL;
2148 }
2149 // Internally track ThreadStackSize in units of 1024 bytes.
2150 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2151 round_to((int)long_ThreadStackSize, K) / K);
2152 // -Xoss
2153 } else if (match_option(option, "-Xoss", &tail)) {
2154 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2155 // -Xmaxjitcodesize
2156 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2157 julong long_ReservedCodeCacheSize = 0;
2158 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2159 (size_t)InitialCodeCacheSize);
2160 if (errcode != arg_in_range) {
2161 jio_fprintf(defaultStream::error_stream(),
2162 "Invalid maximum code cache size: %s\n",
2163 option->optionString);
2164 describe_range_error(errcode);
2165 return JNI_EINVAL;
2166 }
2167 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2168 // -green
2169 } else if (match_option(option, "-green", &tail)) {
2170 jio_fprintf(defaultStream::error_stream(),
2171 "Green threads support not available\n");
2172 return JNI_EINVAL;
2173 // -native
2174 } else if (match_option(option, "-native", &tail)) {
2175 // HotSpot always uses native threads, ignore silently for compatibility
2176 // -Xsqnopause
2177 } else if (match_option(option, "-Xsqnopause", &tail)) {
2178 // EVM option, ignore silently for compatibility
2179 // -Xrs
2180 } else if (match_option(option, "-Xrs", &tail)) {
2181 // Classic/EVM option, new functionality
2182 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2183 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2184 // change default internal VM signals used - lower case for back compat
2185 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2186 // -Xoptimize
2187 } else if (match_option(option, "-Xoptimize", &tail)) {
2188 // EVM option, ignore silently for compatibility
2189 // -Xprof
2190 } else if (match_option(option, "-Xprof", &tail)) {
2191 #ifndef FPROF_KERNEL
2192 _has_profile = true;
2193 #else // FPROF_KERNEL
2194 // do we have to exit?
2195 warning("Kernel VM does not support flat profiling.");
2196 #endif // FPROF_KERNEL
2197 // -Xaprof
2198 } else if (match_option(option, "-Xaprof", &tail)) {
2199 _has_alloc_profile = true;
2200 // -Xconcurrentio
2201 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2202 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2203 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2204 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2205 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2206 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2207
2208 // -Xinternalversion
2209 } else if (match_option(option, "-Xinternalversion", &tail)) {
2210 jio_fprintf(defaultStream::output_stream(), "%s\n",
2211 VM_Version::internal_vm_info_string());
2212 vm_exit(0);
2213 #ifndef PRODUCT
2214 // -Xprintflags
2215 } else if (match_option(option, "-Xprintflags", &tail)) {
2216 CommandLineFlags::printFlags();
2217 vm_exit(0);
2218 #endif
2219 // -D
2220 } else if (match_option(option, "-D", &tail)) {
2221 if (!add_property(tail)) {
2222 return JNI_ENOMEM;
2223 }
2224 // Out of the box management support
2225 if (match_option(option, "-Dcom.sun.management", &tail)) {
2226 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2227 }
2228 // -Xint
2229 } else if (match_option(option, "-Xint", &tail)) {
2230 set_mode_flags(_int);
2231 // -Xmixed
2232 } else if (match_option(option, "-Xmixed", &tail)) {
2233 set_mode_flags(_mixed);
2234 // -Xcomp
2235 } else if (match_option(option, "-Xcomp", &tail)) {
2236 // for testing the compiler; turn off all flags that inhibit compilation
2237 set_mode_flags(_comp);
2238
2239 // -Xshare:dump
2240 } else if (match_option(option, "-Xshare:dump", &tail)) {
2241 #ifdef TIERED
2242 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2243 set_mode_flags(_int); // Prevent compilation, which creates objects
2244 #elif defined(COMPILER2)
2245 vm_exit_during_initialization(
2246 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2247 #elif defined(KERNEL)
2248 vm_exit_during_initialization(
2249 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2250 #else
2251 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2252 set_mode_flags(_int); // Prevent compilation, which creates objects
2253 #endif
2254 // -Xshare:on
2255 } else if (match_option(option, "-Xshare:on", &tail)) {
2256 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2257 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2258 #ifdef TIERED
2259 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2260 #endif // TIERED
2261 // -Xshare:auto
2262 } else if (match_option(option, "-Xshare:auto", &tail)) {
2263 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2264 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2265 // -Xshare:off
2266 } else if (match_option(option, "-Xshare:off", &tail)) {
2267 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2268 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2269
2270 // -Xverify
2271 } else if (match_option(option, "-Xverify", &tail)) {
2272 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2273 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2274 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2275 } else if (strcmp(tail, ":remote") == 0) {
2276 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2277 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2278 } else if (strcmp(tail, ":none") == 0) {
2279 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2280 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2281 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2282 return JNI_EINVAL;
2283 }
2284 // -Xdebug
2285 } else if (match_option(option, "-Xdebug", &tail)) {
2286 // note this flag has been used, then ignore
2287 set_xdebug_mode(true);
2288 // -Xnoagent
2289 } else if (match_option(option, "-Xnoagent", &tail)) {
2290 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2291 } else if (match_option(option, "-Xboundthreads", &tail)) {
2292 // Bind user level threads to kernel threads (Solaris only)
2293 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2294 } else if (match_option(option, "-Xloggc:", &tail)) {
2295 // Redirect GC output to the file. -Xloggc:<filename>
2296 // ostream_init_log(), when called will use this filename
2297 // to initialize a fileStream.
2298 _gc_log_filename = strdup(tail);
2299 FLAG_SET_CMDLINE(bool, PrintGC, true);
2300 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2301 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2302
2303 // JNI hooks
2304 } else if (match_option(option, "-Xcheck", &tail)) {
2305 if (!strcmp(tail, ":jni")) {
2306 CheckJNICalls = true;
2307 } else if (is_bad_option(option, args->ignoreUnrecognized,
2308 "check")) {
2309 return JNI_EINVAL;
2310 }
2311 } else if (match_option(option, "vfprintf", &tail)) {
2312 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2313 } else if (match_option(option, "exit", &tail)) {
2314 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2315 } else if (match_option(option, "abort", &tail)) {
2316 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2317 // -XX:+AggressiveHeap
2318 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2319
2320 // This option inspects the machine and attempts to set various
2321 // parameters to be optimal for long-running, memory allocation
2322 // intensive jobs. It is intended for machines with large
2323 // amounts of cpu and memory.
2324
2325 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2326 // VM, but we may not be able to represent the total physical memory
2327 // available (like having 8gb of memory on a box but using a 32bit VM).
2328 // Thus, we need to make sure we're using a julong for intermediate
2329 // calculations.
2330 julong initHeapSize;
2331 julong total_memory = os::physical_memory();
2332
2333 if (total_memory < (julong)256*M) {
2334 jio_fprintf(defaultStream::error_stream(),
2335 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2336 vm_exit(1);
2337 }
2338
2339 // The heap size is half of available memory, or (at most)
2340 // all of possible memory less 160mb (leaving room for the OS
2341 // when using ISM). This is the maximum; because adaptive sizing
2342 // is turned on below, the actual space used may be smaller.
2343
2344 initHeapSize = MIN2(total_memory / (julong)2,
2345 total_memory - (julong)160*M);
2346
2347 // Make sure that if we have a lot of memory we cap the 32 bit
2348 // process space. The 64bit VM version of this function is a nop.
2349 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2350
2351 // The perm gen is separate but contiguous with the
2352 // object heap (and is reserved with it) so subtract it
2353 // from the heap size.
2354 if (initHeapSize > MaxPermSize) {
2355 initHeapSize = initHeapSize - MaxPermSize;
2356 } else {
2357 warning("AggressiveHeap and MaxPermSize values may conflict");
2358 }
2359
2360 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2361 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2362 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2363 // Currently the minimum size and the initial heap sizes are the same.
2364 set_min_heap_size(initHeapSize);
2365 }
2366 if (FLAG_IS_DEFAULT(NewSize)) {
2367 // Make the young generation 3/8ths of the total heap.
2368 FLAG_SET_CMDLINE(uintx, NewSize,
2369 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2370 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2371 }
2372
2373 FLAG_SET_DEFAULT(UseLargePages, true);
2374
2375 // Increase some data structure sizes for efficiency
2376 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2377 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2378 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2379
2380 // See the OldPLABSize comment below, but replace 'after promotion'
2381 // with 'after copying'. YoungPLABSize is the size of the survivor
2382 // space per-gc-thread buffers. The default is 4kw.
2383 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2384
2385 // OldPLABSize is the size of the buffers in the old gen that
2386 // UseParallelGC uses to promote live data that doesn't fit in the
2387 // survivor spaces. At any given time, there's one for each gc thread.
2388 // The default size is 1kw. These buffers are rarely used, since the
2389 // survivor spaces are usually big enough. For specjbb, however, there
2390 // are occasions when there's lots of live data in the young gen
2391 // and we end up promoting some of it. We don't have a definite
2392 // explanation for why bumping OldPLABSize helps, but the theory
2393 // is that a bigger PLAB results in retaining something like the
2394 // original allocation order after promotion, which improves mutator
2395 // locality. A minor effect may be that larger PLABs reduce the
2396 // number of PLAB allocation events during gc. The value of 8kw
2397 // was arrived at by experimenting with specjbb.
2398 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2399
2400 // CompilationPolicyChoice=0 causes the server compiler to adopt
2401 // a more conservative which-method-do-I-compile policy when one
2402 // of the counters maintained by the interpreter trips. The
2403 // result is reduced startup time and improved specjbb and
2404 // alacrity performance. Zero is the default, but we set it
2405 // explicitly here in case the default changes.
2406 // See runtime/compilationPolicy.*.
2407 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2408
2409 // Enable parallel GC and adaptive generation sizing
2410 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2411 FLAG_SET_DEFAULT(ParallelGCThreads,
2412 Abstract_VM_Version::parallel_worker_threads());
2413
2414 // Encourage steady state memory management
2415 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2416
2417 // This appears to improve mutator locality
2418 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2419
2420 // Get around early Solaris scheduling bug
2421 // (affinity vs other jobs on system)
2422 // but disallow DR and offlining (5008695).
2423 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2424
2425 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2426 // The last option must always win.
2427 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2428 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2429 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2430 // The last option must always win.
2431 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2432 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2433 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2434 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2435 jio_fprintf(defaultStream::error_stream(),
2436 "Please use CMSClassUnloadingEnabled in place of "
2437 "CMSPermGenSweepingEnabled in the future\n");
2438 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2439 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2440 jio_fprintf(defaultStream::error_stream(),
2441 "Please use -XX:+UseGCOverheadLimit in place of "
2442 "-XX:+UseGCTimeLimit in the future\n");
2443 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2444 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Please use -XX:-UseGCOverheadLimit in place of "
2447 "-XX:-UseGCTimeLimit in the future\n");
2448 // The TLE options are for compatibility with 1.3 and will be
2449 // removed without notice in a future release. These options
2450 // are not to be documented.
2451 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2452 // No longer used.
2453 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2454 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2455 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2456 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2457 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2458 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2459 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2460 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2461 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2462 // No longer used.
2463 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2464 julong long_tlab_size = 0;
2465 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2466 if (errcode != arg_in_range) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Invalid TLAB size: %s\n", option->optionString);
2469 describe_range_error(errcode);
2470 return JNI_EINVAL;
2471 }
2472 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2473 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2474 // No longer used.
2475 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2476 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2477 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2478 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2479 SOLARIS_ONLY(
2480 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2481 warning("-XX:+UsePermISM is obsolete.");
2482 FLAG_SET_CMDLINE(bool, UseISM, true);
2483 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2484 FLAG_SET_CMDLINE(bool, UseISM, false);
2485 )
2486 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2487 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2488 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2489 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2490 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2491 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2492 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2493 #ifdef SOLARIS
2494 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2495 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2496 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2497 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2498 #else // ndef SOLARIS
2499 jio_fprintf(defaultStream::error_stream(),
2500 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2501 return JNI_EINVAL;
2502 #endif // ndef SOLARIS
2503 #ifdef ASSERT
2504 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2505 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2506 // disable scavenge before parallel mark-compact
2507 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2508 #endif
2509 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2510 julong cms_blocks_to_claim = (julong)atol(tail);
2511 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2512 jio_fprintf(defaultStream::error_stream(),
2513 "Please use -XX:OldPLABSize in place of "
2514 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2515 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2516 julong cms_blocks_to_claim = (julong)atol(tail);
2517 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Please use -XX:OldPLABSize in place of "
2520 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2521 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2522 julong old_plab_size = 0;
2523 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2524 if (errcode != arg_in_range) {
2525 jio_fprintf(defaultStream::error_stream(),
2526 "Invalid old PLAB size: %s\n", option->optionString);
2527 describe_range_error(errcode);
2528 return JNI_EINVAL;
2529 }
2530 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Please use -XX:OldPLABSize in place of "
2533 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2534 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2535 julong young_plab_size = 0;
2536 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2537 if (errcode != arg_in_range) {
2538 jio_fprintf(defaultStream::error_stream(),
2539 "Invalid young PLAB size: %s\n", option->optionString);
2540 describe_range_error(errcode);
2541 return JNI_EINVAL;
2542 }
2543 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2544 jio_fprintf(defaultStream::error_stream(),
2545 "Please use -XX:YoungPLABSize in place of "
2546 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2547 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2548 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2549 julong stack_size = 0;
2550 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2551 if (errcode != arg_in_range) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Invalid mark stack size: %s\n", option->optionString);
2554 describe_range_error(errcode);
2555 return JNI_EINVAL;
2556 }
2557 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2558 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2559 julong max_stack_size = 0;
2560 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2561 if (errcode != arg_in_range) {
2562 jio_fprintf(defaultStream::error_stream(),
2563 "Invalid maximum mark stack size: %s\n",
2564 option->optionString);
2565 describe_range_error(errcode);
2566 return JNI_EINVAL;
2567 }
2568 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2569 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2570 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2571 uintx conc_threads = 0;
2572 if (!parse_uintx(tail, &conc_threads, 1)) {
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Invalid concurrent threads: %s\n", option->optionString);
2575 return JNI_EINVAL;
2576 }
2577 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2578 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2579 // Skip -XX:Flags= since that case has already been handled
2580 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2581 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2582 return JNI_EINVAL;
2583 }
2584 }
2585 // Unknown option
2586 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2587 return JNI_ERR;
2588 }
2589 }
2590 // Change the default value for flags which have different default values
2591 // when working with older JDKs.
2592 if (JDK_Version::current().compare_major(6) <= 0 &&
2593 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2594 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2595 }
2596 #ifdef LINUX
2597 if (JDK_Version::current().compare_major(6) <= 0 &&
2598 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2599 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2600 }
2601 #endif // LINUX
2602 return JNI_OK;
2603 }
2604
2605 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2606 // This must be done after all -D arguments have been processed.
2607 scp_p->expand_endorsed();
2608
2609 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2610 // Assemble the bootclasspath elements into the final path.
2611 Arguments::set_sysclasspath(scp_p->combined_path());
2612 }
2613
2614 // This must be done after all arguments have been processed.
2615 // java_compiler() true means set to "NONE" or empty.
2616 if (java_compiler() && !xdebug_mode()) {
2617 // For backwards compatibility, we switch to interpreted mode if
2618 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2619 // not specified.
2620 set_mode_flags(_int);
2621 }
2622 if (CompileThreshold == 0) {
2623 set_mode_flags(_int);
2624 }
2625
2626 #ifdef TIERED
2627 // If we are using tiered compilation in the tiered vm then c1 will
2628 // do the profiling and we don't want to waste that time in the
2629 // interpreter.
2630 if (TieredCompilation) {
2631 ProfileInterpreter = false;
2632 } else {
2633 // Since we are running vanilla server we must adjust the compile threshold
2634 // unless the user has already adjusted it because the default threshold assumes
2635 // we will run tiered.
2636
2637 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2638 CompileThreshold = Tier2CompileThreshold;
2639 }
2640 }
2641 #endif // TIERED
2642
2643 #ifndef COMPILER2
2644 // Don't degrade server performance for footprint
2645 if (FLAG_IS_DEFAULT(UseLargePages) &&
2646 MaxHeapSize < LargePageHeapSizeThreshold) {
2647 // No need for large granularity pages w/small heaps.
2648 // Note that large pages are enabled/disabled for both the
2649 // Java heap and the code cache.
2650 FLAG_SET_DEFAULT(UseLargePages, false);
2651 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2652 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2653 }
2654
2655 // Tiered compilation is undefined with C1.
2656 TieredCompilation = false;
2657
2658 #else
2659 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2660 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2661 }
2662 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2663 if (UseG1GC) {
2664 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2665 }
2666 #endif
2667
2668 // If we are running in a headless jre, force java.awt.headless property
2669 // to be true unless the property has already been set.
2670 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2671 if (os::is_headless_jre()) {
2672 const char* headless = Arguments::get_property("java.awt.headless");
2673 if (headless == NULL) {
2674 char envbuffer[128];
2675 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2676 if (!add_property("java.awt.headless=true")) {
2677 return JNI_ENOMEM;
2678 }
2679 } else {
2680 char buffer[256];
2681 strcpy(buffer, "java.awt.headless=");
2682 strcat(buffer, envbuffer);
2683 if (!add_property(buffer)) {
2684 return JNI_ENOMEM;
2685 }
2686 }
2687 }
2688 }
2689
2690 if (!check_vm_args_consistency()) {
2691 return JNI_ERR;
2692 }
2693
2694 return JNI_OK;
2695 }
2696
2697 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2698 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2699 scp_assembly_required_p);
2700 }
2701
2702 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2703 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2704 scp_assembly_required_p);
2705 }
2706
2707 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2708 const int N_MAX_OPTIONS = 64;
2709 const int OPTION_BUFFER_SIZE = 1024;
2710 char buffer[OPTION_BUFFER_SIZE];
2711
2712 // The variable will be ignored if it exceeds the length of the buffer.
2713 // Don't check this variable if user has special privileges
2714 // (e.g. unix su command).
2715 if (os::getenv(name, buffer, sizeof(buffer)) &&
2716 !os::have_special_privileges()) {
2717 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Picked up %s: %s\n", name, buffer);
2720 char* rd = buffer; // pointer to the input string (rd)
2721 int i;
2722 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2723 while (isspace(*rd)) rd++; // skip whitespace
2724 if (*rd == 0) break; // we re done when the input string is read completely
2725
2726 // The output, option string, overwrites the input string.
2727 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2728 // input string (rd).
2729 char* wrt = rd;
2730
2731 options[i++].optionString = wrt; // Fill in option
2732 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2733 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2734 int quote = *rd; // matching quote to look for
2735 rd++; // don't copy open quote
2736 while (*rd != quote) { // include everything (even spaces) up until quote
2737 if (*rd == 0) { // string termination means unmatched string
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Unmatched quote in %s\n", name);
2740 return JNI_ERR;
2741 }
2742 *wrt++ = *rd++; // copy to option string
2743 }
2744 rd++; // don't copy close quote
2745 } else {
2746 *wrt++ = *rd++; // copy to option string
2747 }
2748 }
2749 // Need to check if we're done before writing a NULL,
2750 // because the write could be to the byte that rd is pointing to.
2751 if (*rd++ == 0) {
2752 *wrt = 0;
2753 break;
2754 }
2755 *wrt = 0; // Zero terminate option
2756 }
2757 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2758 JavaVMInitArgs vm_args;
2759 vm_args.version = JNI_VERSION_1_2;
2760 vm_args.options = options;
2761 vm_args.nOptions = i;
2762 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2763
2764 if (PrintVMOptions) {
2765 const char* tail;
2766 for (int i = 0; i < vm_args.nOptions; i++) {
2767 const JavaVMOption *option = vm_args.options + i;
2768 if (match_option(option, "-XX:", &tail)) {
2769 logOption(tail);
2770 }
2771 }
2772 }
2773
2774 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2775 }
2776 return JNI_OK;
2777 }
2778
2779 // Parse entry point called from JNI_CreateJavaVM
2780
2781 jint Arguments::parse(const JavaVMInitArgs* args) {
2782
2783 // Sharing support
2784 // Construct the path to the archive
2785 char jvm_path[JVM_MAXPATHLEN];
2786 os::jvm_path(jvm_path, sizeof(jvm_path));
2787 #ifdef TIERED
2788 if (strstr(jvm_path, "client") != NULL) {
2789 force_client_mode = true;
2790 }
2791 #endif // TIERED
2792 char *end = strrchr(jvm_path, *os::file_separator());
2793 if (end != NULL) *end = '\0';
2794 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2795 strlen(os::file_separator()) + 20);
2796 if (shared_archive_path == NULL) return JNI_ENOMEM;
2797 strcpy(shared_archive_path, jvm_path);
2798 strcat(shared_archive_path, os::file_separator());
2799 strcat(shared_archive_path, "classes");
2800 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2801 strcat(shared_archive_path, ".jsa");
2802 SharedArchivePath = shared_archive_path;
2803
2804 // Remaining part of option string
2805 const char* tail;
2806
2807 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2808 bool settings_file_specified = false;
2809 const char* flags_file;
2810 int index;
2811 for (index = 0; index < args->nOptions; index++) {
2812 const JavaVMOption *option = args->options + index;
2813 if (match_option(option, "-XX:Flags=", &tail)) {
2814 flags_file = tail;
2815 settings_file_specified = true;
2816 }
2817 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2818 PrintVMOptions = true;
2819 }
2820 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2821 PrintVMOptions = false;
2822 }
2823 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2824 IgnoreUnrecognizedVMOptions = true;
2825 }
2826 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2827 IgnoreUnrecognizedVMOptions = false;
2828 }
2829 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2830 CommandLineFlags::printFlags();
2831 vm_exit(0);
2832 }
2833 }
2834
2835 if (IgnoreUnrecognizedVMOptions) {
2836 // uncast const to modify the flag args->ignoreUnrecognized
2837 *(jboolean*)(&args->ignoreUnrecognized) = true;
2838 }
2839
2840 // Parse specified settings file
2841 if (settings_file_specified) {
2842 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2843 return JNI_EINVAL;
2844 }
2845 }
2846
2847 // Parse default .hotspotrc settings file
2848 if (!settings_file_specified) {
2849 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2850 return JNI_EINVAL;
2851 }
2852 }
2853
2854 if (PrintVMOptions) {
2855 for (index = 0; index < args->nOptions; index++) {
2856 const JavaVMOption *option = args->options + index;
2857 if (match_option(option, "-XX:", &tail)) {
2858 logOption(tail);
2859 }
2860 }
2861 }
2862
2863 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2864 jint result = parse_vm_init_args(args);
2865 if (result != JNI_OK) {
2866 return result;
2867 }
2868
2869 #ifndef PRODUCT
2870 if (TraceBytecodesAt != 0) {
2871 TraceBytecodes = true;
2872 }
2873 if (CountCompiledCalls) {
2874 if (UseCounterDecay) {
2875 warning("UseCounterDecay disabled because CountCalls is set");
2876 UseCounterDecay = false;
2877 }
2878 }
2879 #endif // PRODUCT
2880
2881 if (EnableInvokeDynamic && !EnableMethodHandles) {
2882 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2883 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2884 }
2885 EnableMethodHandles = true;
2886 }
2887 if (EnableMethodHandles && !AnonymousClasses) {
2888 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2889 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2890 }
2891 AnonymousClasses = true;
2892 }
2893 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2894 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2895 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2896 }
2897 ScavengeRootsInCode = 1;
2898 }
2899 #ifdef COMPILER2
2900 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2901 // TODO: We need to find rules for invokedynamic and EA. For now,
2902 // simply disable EA by default.
2903 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2904 DoEscapeAnalysis = false;
2905 }
2906 }
2907 #endif
2908
2909 if (PrintGCDetails) {
2910 // Turn on -verbose:gc options as well
2911 PrintGC = true;
2912 }
2913
2914 #if defined(_LP64) && defined(COMPILER1)
2915 UseCompressedOops = false;
2916 #endif
2917
2918 // Set object alignment values.
2919 set_object_alignment();
2920
2921 #ifdef SERIALGC
2922 force_serial_gc();
2923 #endif // SERIALGC
2924 #ifdef KERNEL
2925 no_shared_spaces();
2926 #endif // KERNEL
2927
2928 // Set flags based on ergonomics.
2929 set_ergonomics_flags();
2930
2931 #ifdef _LP64
2932 // XXX JSR 292 currently does not support compressed oops.
2933 if (EnableMethodHandles && UseCompressedOops) {
2934 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2935 UseCompressedOops = false;
2936 }
2937 }
2938 #endif // _LP64
2939
2940 // Check the GC selections again.
2941 if (!check_gc_consistency()) {
2942 return JNI_EINVAL;
2943 }
2944
2945 #ifndef KERNEL
2946 if (UseConcMarkSweepGC) {
2947 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
2948 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2949 // are true, we don't call set_parnew_gc_flags() as well.
2950 set_cms_and_parnew_gc_flags();
2951 } else {
2952 // Set heap size based on available physical memory
2953 set_heap_size();
2954 // Set per-collector flags
2955 if (UseParallelGC || UseParallelOldGC) {
2956 set_parallel_gc_flags();
2957 } else if (UseParNewGC) {
2958 set_parnew_gc_flags();
2959 } else if (UseG1GC) {
2960 set_g1_gc_flags();
2961 }
2962 }
2963 #endif // KERNEL
2964
2965 #ifdef SERIALGC
2966 assert(verify_serial_gc_flags(), "SerialGC unset");
2967 #endif // SERIALGC
2968
2969 // Set bytecode rewriting flags
2970 set_bytecode_flags();
2971
2972 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2973 set_aggressive_opts_flags();
2974
2975 #ifdef CC_INTERP
2976 // Clear flags not supported by the C++ interpreter
2977 FLAG_SET_DEFAULT(ProfileInterpreter, false);
2978 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2979 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
2980 #endif // CC_INTERP
2981
2982 #ifdef COMPILER2
2983 if (!UseBiasedLocking || EmitSync != 0) {
2984 UseOptoBiasInlining = false;
2985 }
2986 #endif
2987
2988 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
2989 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
2990 DebugNonSafepoints = true;
2991 }
2992
2993 #ifndef PRODUCT
2994 if (CompileTheWorld) {
2995 // Force NmethodSweeper to sweep whole CodeCache each time.
2996 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
2997 NmethodSweepFraction = 1;
2998 }
2999 }
3000 #endif
3001
3002 if (PrintCommandLineFlags) {
3003 CommandLineFlags::printSetFlags();
3004 }
3005
3006 if (PrintFlagsFinal) {
3007 CommandLineFlags::printFlags();
3008 }
3009
3010 // Apply CPU specific policy for the BiasedLocking
3011 if (UseBiasedLocking) {
3012 if (!VM_Version::use_biased_locking() &&
3013 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3014 UseBiasedLocking = false;
3015 }
3016 }
3017
3018 return JNI_OK;
3019 }
3020
3021 int Arguments::PropertyList_count(SystemProperty* pl) {
3022 int count = 0;
3023 while(pl != NULL) {
3024 count++;
3025 pl = pl->next();
3026 }
3027 return count;
3028 }
3029
3030 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3031 assert(key != NULL, "just checking");
3032 SystemProperty* prop;
3033 for (prop = pl; prop != NULL; prop = prop->next()) {
3034 if (strcmp(key, prop->key()) == 0) return prop->value();
3035 }
3036 return NULL;
3037 }
3038
3039 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3040 int count = 0;
3041 const char* ret_val = NULL;
3042
3043 while(pl != NULL) {
3044 if(count >= index) {
3045 ret_val = pl->key();
3046 break;
3047 }
3048 count++;
3049 pl = pl->next();
3050 }
3051
3052 return ret_val;
3053 }
3054
3055 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3056 int count = 0;
3057 char* ret_val = NULL;
3058
3059 while(pl != NULL) {
3060 if(count >= index) {
3061 ret_val = pl->value();
3062 break;
3063 }
3064 count++;
3065 pl = pl->next();
3066 }
3067
3068 return ret_val;
3069 }
3070
3071 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3072 SystemProperty* p = *plist;
3073 if (p == NULL) {
3074 *plist = new_p;
3075 } else {
3076 while (p->next() != NULL) {
3077 p = p->next();
3078 }
3079 p->set_next(new_p);
3080 }
3081 }
3082
3083 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3084 if (plist == NULL)
3085 return;
3086
3087 SystemProperty* new_p = new SystemProperty(k, v, true);
3088 PropertyList_add(plist, new_p);
3089 }
3090
3091 // This add maintains unique property key in the list.
3092 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3093 if (plist == NULL)
3094 return;
3095
3096 // If property key exist then update with new value.
3097 SystemProperty* prop;
3098 for (prop = *plist; prop != NULL; prop = prop->next()) {
3099 if (strcmp(k, prop->key()) == 0) {
3100 if (append) {
3101 prop->append_value(v);
3102 } else {
3103 prop->set_value(v);
3104 }
3105 return;
3106 }
3107 }
3108
3109 PropertyList_add(plist, k, v);
3110 }
3111
3112 #ifdef KERNEL
3113 char *Arguments::get_kernel_properties() {
3114 // Find properties starting with kernel and append them to string
3115 // We need to find out how long they are first because the URL's that they
3116 // might point to could get long.
3117 int length = 0;
3118 SystemProperty* prop;
3119 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3120 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3121 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3122 }
3123 }
3124 // Add one for null terminator.
3125 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3126 if (length != 0) {
3127 int pos = 0;
3128 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3129 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3130 jio_snprintf(&props[pos], length-pos,
3131 "-D%s=%s ", prop->key(), prop->value());
3132 pos = strlen(props);
3133 }
3134 }
3135 }
3136 // null terminate props in case of null
3137 props[length] = '\0';
3138 return props;
3139 }
3140 #endif // KERNEL
3141
3142 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3143 // Returns true if all of the source pointed by src has been copied over to
3144 // the destination buffer pointed by buf. Otherwise, returns false.
3145 // Notes:
3146 // 1. If the length (buflen) of the destination buffer excluding the
3147 // NULL terminator character is not long enough for holding the expanded
3148 // pid characters, it also returns false instead of returning the partially
3149 // expanded one.
3150 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3151 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3152 char* buf, size_t buflen) {
3153 const char* p = src;
3154 char* b = buf;
3155 const char* src_end = &src[srclen];
3156 char* buf_end = &buf[buflen - 1];
3157
3158 while (p < src_end && b < buf_end) {
3159 if (*p == '%') {
3160 switch (*(++p)) {
3161 case '%': // "%%" ==> "%"
3162 *b++ = *p++;
3163 break;
3164 case 'p': { // "%p" ==> current process id
3165 // buf_end points to the character before the last character so
3166 // that we could write '\0' to the end of the buffer.
3167 size_t buf_sz = buf_end - b + 1;
3168 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3169
3170 // if jio_snprintf fails or the buffer is not long enough to hold
3171 // the expanded pid, returns false.
3172 if (ret < 0 || ret >= (int)buf_sz) {
3173 return false;
3174 } else {
3175 b += ret;
3176 assert(*b == '\0', "fail in copy_expand_pid");
3177 if (p == src_end && b == buf_end + 1) {
3178 // reach the end of the buffer.
3179 return true;
3180 }
3181 }
3182 p++;
3183 break;
3184 }
3185 default :
3186 *b++ = '%';
3187 }
3188 } else {
3189 *b++ = *p++;
3190 }
3191 }
3192 *b = '\0';
3193 return (p == src_end); // return false if not all of the source was copied
3194 }