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 inline uintx max_heap_for_compressed_oops() {
1215 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1216 NOT_LP64(ShouldNotReachHere(); return 0);
1217 }
1218
1219 bool Arguments::should_auto_select_low_pause_collector() {
1220 if (UseAutoGCSelectPolicy &&
1221 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1222 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1223 if (PrintGCDetails) {
1224 // Cannot use gclog_or_tty yet.
1225 tty->print_cr("Automatic selection of the low pause collector"
1226 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1227 }
1228 return true;
1229 }
1230 return false;
1231 }
1232
1233 void Arguments::set_ergonomics_flags() {
1234 // Parallel GC is not compatible with sharing. If one specifies
1235 // that they want sharing explicitly, do not set ergonomics flags.
1236 if (DumpSharedSpaces || ForceSharedSpaces) {
1237 return;
1238 }
1239
1240 if (os::is_server_class_machine() && !force_client_mode ) {
1241 // If no other collector is requested explicitly,
1242 // let the VM select the collector based on
1243 // machine class and automatic selection policy.
1244 if (!UseSerialGC &&
1245 !UseConcMarkSweepGC &&
1246 !UseG1GC &&
1247 !UseParNewGC &&
1248 !DumpSharedSpaces &&
1249 FLAG_IS_DEFAULT(UseParallelGC)) {
1250 if (should_auto_select_low_pause_collector()) {
1251 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1252 } else {
1253 FLAG_SET_ERGO(bool, UseParallelGC, true);
1254 }
1255 no_shared_spaces();
1256 }
1257 }
1258
1259 #ifndef ZERO
1260 #ifdef _LP64
1261 // Check that UseCompressedOops can be set with the max heap size allocated
1262 // by ergonomics.
1263 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1264 #ifndef COMPILER1
1265 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1266 // Disable Compressed Oops by default. Uncomment next line to enable it.
1267 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1268 }
1269 #endif
1270 #ifdef _WIN64
1271 if (UseLargePages && UseCompressedOops) {
1272 // Cannot allocate guard pages for implicit checks in indexed addressing
1273 // mode, when large pages are specified on windows.
1274 // This flag could be switched ON if narrow oop base address is set to 0,
1275 // see code in Universe::initialize_heap().
1276 Universe::set_narrow_oop_use_implicit_null_checks(false);
1277 }
1278 #endif // _WIN64
1279 } else {
1280 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1281 warning("Max heap size too large for Compressed Oops");
1282 FLAG_SET_DEFAULT(UseCompressedOops, false);
1283 }
1284 }
1285 // Also checks that certain machines are slower with compressed oops
1286 // in vm_version initialization code.
1287 #endif // _LP64
1288 #endif // !ZERO
1289 }
1290
1291 void Arguments::set_parallel_gc_flags() {
1292 assert(UseParallelGC || UseParallelOldGC, "Error");
1293 // If parallel old was requested, automatically enable parallel scavenge.
1294 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1295 FLAG_SET_DEFAULT(UseParallelGC, true);
1296 }
1297
1298 // If no heap maximum was requested explicitly, use some reasonable fraction
1299 // of the physical memory, up to a maximum of 1GB.
1300 if (UseParallelGC) {
1301 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1302 Abstract_VM_Version::parallel_worker_threads());
1303
1304 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1305 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1306 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1307 // See CR 6362902 for details.
1308 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1309 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1310 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1311 }
1312 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1313 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1314 }
1315 }
1316
1317 if (UseParallelOldGC) {
1318 // Par compact uses lower default values since they are treated as
1319 // minimums. These are different defaults because of the different
1320 // interpretation and are not ergonomically set.
1321 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1322 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1323 }
1324 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1325 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1326 }
1327 }
1328 }
1329 }
1330
1331 void Arguments::set_g1_gc_flags() {
1332 assert(UseG1GC, "Error");
1333 #ifdef COMPILER1
1334 FastTLABRefill = false;
1335 #endif
1336 FLAG_SET_DEFAULT(ParallelGCThreads,
1337 Abstract_VM_Version::parallel_worker_threads());
1338 if (ParallelGCThreads == 0) {
1339 FLAG_SET_DEFAULT(ParallelGCThreads,
1340 Abstract_VM_Version::parallel_worker_threads());
1341 }
1342 no_shared_spaces();
1343
1344 // Set the maximum pause time goal to be a reasonable default.
1345 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1346 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1347 }
1348
1349 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1350 // Size as a multiple of TaskQueueSuper::N which is larger
1351 // for 64-bit.
1352 FLAG_SET_DEFAULT(MarkStackSize, 128 * TaskQueueSuper::total_size());
1353 }
1354 if (PrintGCDetails && Verbose) {
1355 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1356 MarkStackSize / K, MarkStackSizeMax / K);
1357 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1358 }
1359
1360 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1361 // In G1, we want the default GC overhead goal to be higher than
1362 // say in PS. So we set it here to 10%. Otherwise the heap might
1363 // be expanded more aggressively than we would like it to. In
1364 // fact, even 10% seems to not be high enough in some cases
1365 // (especially small GC stress tests that the main thing they do
1366 // is allocation). We might consider increase it further.
1367 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1368 }
1369 }
1370
1371 void Arguments::set_heap_size() {
1372 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1373 // Deprecated flag
1374 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1375 }
1376
1377 const julong phys_mem =
1378 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1379 : (julong)MaxRAM;
1380
1381 // If the maximum heap size has not been set with -Xmx,
1382 // then set it as fraction of the size of physical memory,
1383 // respecting the maximum and minimum sizes of the heap.
1384 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1385 julong reasonable_max = phys_mem / MaxRAMFraction;
1386
1387 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1388 // Small physical memory, so use a minimum fraction of it for the heap
1389 reasonable_max = phys_mem / MinRAMFraction;
1390 } else {
1391 // Not-small physical memory, so require a heap at least
1392 // as large as MaxHeapSize
1393 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1394 }
1395 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1396 // Limit the heap size to ErgoHeapSizeLimit
1397 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1398 }
1399 if (UseCompressedOops) {
1400 // Limit the heap size to the maximum possible when using compressed oops
1401 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1402 }
1403 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1404
1405 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1406 // An initial heap size was specified on the command line,
1407 // so be sure that the maximum size is consistent. Done
1408 // after call to allocatable_physical_memory because that
1409 // method might reduce the allocation size.
1410 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1411 }
1412
1413 if (PrintGCDetails && Verbose) {
1414 // Cannot use gclog_or_tty yet.
1415 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1416 }
1417 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1418 }
1419
1420 // If the initial_heap_size has not been set with InitialHeapSize
1421 // or -Xms, then set it as fraction of the size of physical memory,
1422 // respecting the maximum and minimum sizes of the heap.
1423 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1424 julong reasonable_minimum = (julong)(OldSize + NewSize);
1425
1426 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1427
1428 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1429
1430 julong reasonable_initial = phys_mem / InitialRAMFraction;
1431
1432 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1433 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1434
1435 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1436
1437 if (PrintGCDetails && Verbose) {
1438 // Cannot use gclog_or_tty yet.
1439 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1440 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1441 }
1442 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1443 set_min_heap_size((uintx)reasonable_minimum);
1444 }
1445 }
1446
1447 // This must be called after ergonomics because we want bytecode rewriting
1448 // if the server compiler is used, or if UseSharedSpaces is disabled.
1449 void Arguments::set_bytecode_flags() {
1450 // Better not attempt to store into a read-only space.
1451 if (UseSharedSpaces) {
1452 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1453 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1454 }
1455
1456 if (!RewriteBytecodes) {
1457 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1458 }
1459 }
1460
1461 // Aggressive optimization flags -XX:+AggressiveOpts
1462 void Arguments::set_aggressive_opts_flags() {
1463 #ifdef COMPILER2
1464 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1465 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1466 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1467 }
1468 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1469 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1470 }
1471
1472 // Feed the cache size setting into the JDK
1473 char buffer[1024];
1474 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1475 add_property(buffer);
1476 }
1477 if (AggressiveOpts) {
1478 // Switch on optimizations with AggressiveOpts.
1479 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1480 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1481 }
1482 if (FLAG_IS_DEFAULT(UseLoopPredicate)) {
1483 FLAG_SET_DEFAULT(UseLoopPredicate, true);
1484 }
1485 if (FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1486 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1487 }
1488 }
1489 #endif
1490
1491 if (AggressiveOpts) {
1492 // Sample flag setting code
1493 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1494 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1495 // }
1496 }
1497 }
1498
1499 //===========================================================================================================
1500 // Parsing of java.compiler property
1501
1502 void Arguments::process_java_compiler_argument(char* arg) {
1503 // For backwards compatibility, Djava.compiler=NONE or ""
1504 // causes us to switch to -Xint mode UNLESS -Xdebug
1505 // is also specified.
1506 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1507 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1508 }
1509 }
1510
1511 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1512 _sun_java_launcher = strdup(launcher);
1513 }
1514
1515 bool Arguments::created_by_java_launcher() {
1516 assert(_sun_java_launcher != NULL, "property must have value");
1517 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1518 }
1519
1520 //===========================================================================================================
1521 // Parsing of main arguments
1522
1523 bool Arguments::verify_interval(uintx val, uintx min,
1524 uintx max, const char* name) {
1525 // Returns true iff value is in the inclusive interval [min..max]
1526 // false, otherwise.
1527 if (val >= min && val <= max) {
1528 return true;
1529 }
1530 jio_fprintf(defaultStream::error_stream(),
1531 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1532 " and " UINTX_FORMAT "\n",
1533 name, val, min, max);
1534 return false;
1535 }
1536
1537 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1538 // Returns true if given value is greater than specified min threshold
1539 // false, otherwise.
1540 if (val >= min ) {
1541 return true;
1542 }
1543 jio_fprintf(defaultStream::error_stream(),
1544 "%s of " UINTX_FORMAT " is invalid; must be greater than " UINTX_FORMAT "\n",
1545 name, val, min);
1546 return false;
1547 }
1548
1549 bool Arguments::verify_percentage(uintx value, const char* name) {
1550 if (value <= 100) {
1551 return true;
1552 }
1553 jio_fprintf(defaultStream::error_stream(),
1554 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1555 name, value);
1556 return false;
1557 }
1558
1559 static void force_serial_gc() {
1560 FLAG_SET_DEFAULT(UseSerialGC, true);
1561 FLAG_SET_DEFAULT(UseParNewGC, false);
1562 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1563 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1564 FLAG_SET_DEFAULT(UseParallelGC, false);
1565 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1566 FLAG_SET_DEFAULT(UseG1GC, false);
1567 }
1568
1569 static bool verify_serial_gc_flags() {
1570 return (UseSerialGC &&
1571 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1572 UseParallelGC || UseParallelOldGC));
1573 }
1574
1575 // Check consistency of GC selection
1576 bool Arguments::check_gc_consistency() {
1577 bool status = true;
1578 // Ensure that the user has not selected conflicting sets
1579 // of collectors. [Note: this check is merely a user convenience;
1580 // collectors over-ride each other so that only a non-conflicting
1581 // set is selected; however what the user gets is not what they
1582 // may have expected from the combination they asked for. It's
1583 // better to reduce user confusion by not allowing them to
1584 // select conflicting combinations.
1585 uint i = 0;
1586 if (UseSerialGC) i++;
1587 if (UseConcMarkSweepGC || UseParNewGC) i++;
1588 if (UseParallelGC || UseParallelOldGC) i++;
1589 if (UseG1GC) i++;
1590 if (i > 1) {
1591 jio_fprintf(defaultStream::error_stream(),
1592 "Conflicting collector combinations in option list; "
1593 "please refer to the release notes for the combinations "
1594 "allowed\n");
1595 status = false;
1596 }
1597
1598 return status;
1599 }
1600
1601 // Check stack pages settings
1602 bool Arguments::check_stack_pages()
1603 {
1604 bool status = true;
1605 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1606 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1607 status = status && verify_min_value(StackShadowPages, 1, "StackShadowPages");
1608 return status;
1609 }
1610
1611 // Check the consistency of vm_init_args
1612 bool Arguments::check_vm_args_consistency() {
1613 // Method for adding checks for flag consistency.
1614 // The intent is to warn the user of all possible conflicts,
1615 // before returning an error.
1616 // Note: Needs platform-dependent factoring.
1617 bool status = true;
1618
1619 #if ( (defined(COMPILER2) && defined(SPARC)))
1620 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1621 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1622 // x86. Normally, VM_Version_init must be called from init_globals in
1623 // init.cpp, which is called by the initial java thread *after* arguments
1624 // have been parsed. VM_Version_init gets called twice on sparc.
1625 extern void VM_Version_init();
1626 VM_Version_init();
1627 if (!VM_Version::has_v9()) {
1628 jio_fprintf(defaultStream::error_stream(),
1629 "V8 Machine detected, Server requires V9\n");
1630 status = false;
1631 }
1632 #endif /* COMPILER2 && SPARC */
1633
1634 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1635 // builds so the cost of stack banging can be measured.
1636 #if (defined(PRODUCT) && defined(SOLARIS))
1637 if (!UseBoundThreads && !UseStackBanging) {
1638 jio_fprintf(defaultStream::error_stream(),
1639 "-UseStackBanging conflicts with -UseBoundThreads\n");
1640
1641 status = false;
1642 }
1643 #endif
1644
1645 if (TLABRefillWasteFraction == 0) {
1646 jio_fprintf(defaultStream::error_stream(),
1647 "TLABRefillWasteFraction should be a denominator, "
1648 "not " SIZE_FORMAT "\n",
1649 TLABRefillWasteFraction);
1650 status = false;
1651 }
1652
1653 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1654 "MaxLiveObjectEvacuationRatio");
1655 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1656 "AdaptiveSizePolicyWeight");
1657 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1658 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1659 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1660 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1661
1662 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1663 jio_fprintf(defaultStream::error_stream(),
1664 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1665 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1666 MinHeapFreeRatio, MaxHeapFreeRatio);
1667 status = false;
1668 }
1669 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1670 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1671
1672 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1673 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1674 }
1675
1676 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1677 // Settings to encourage splitting.
1678 if (!FLAG_IS_CMDLINE(NewRatio)) {
1679 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1680 }
1681 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1682 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1683 }
1684 }
1685
1686 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1687 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1688 if (GCTimeLimit == 100) {
1689 // Turn off gc-overhead-limit-exceeded checks
1690 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1691 }
1692
1693 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1694
1695 // Check user specified sharing option conflict with Parallel GC
1696 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC ||
1697 UseParallelGC || UseParallelOldGC ||
1698 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1699
1700 if (cannot_share) {
1701 // Either force sharing on by forcing the other options off, or
1702 // force sharing off.
1703 if (DumpSharedSpaces || ForceSharedSpaces) {
1704 jio_fprintf(defaultStream::error_stream(),
1705 "Reverting to Serial GC because of %s\n",
1706 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump");
1707 force_serial_gc();
1708 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1709 } else {
1710 if (UseSharedSpaces && Verbose) {
1711 jio_fprintf(defaultStream::error_stream(),
1712 "Turning off use of shared archive because of "
1713 "choice of garbage collector or large pages\n");
1714 }
1715 no_shared_spaces();
1716 }
1717 }
1718
1719 status = status && check_gc_consistency();
1720 status = status && check_stack_pages();
1721
1722 if (_has_alloc_profile) {
1723 if (UseParallelGC || UseParallelOldGC) {
1724 jio_fprintf(defaultStream::error_stream(),
1725 "error: invalid argument combination.\n"
1726 "Allocation profiling (-Xaprof) cannot be used together with "
1727 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1728 status = false;
1729 }
1730 if (UseConcMarkSweepGC) {
1731 jio_fprintf(defaultStream::error_stream(),
1732 "error: invalid argument combination.\n"
1733 "Allocation profiling (-Xaprof) cannot be used together with "
1734 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1735 status = false;
1736 }
1737 }
1738
1739 if (CMSIncrementalMode) {
1740 if (!UseConcMarkSweepGC) {
1741 jio_fprintf(defaultStream::error_stream(),
1742 "error: invalid argument combination.\n"
1743 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1744 "selected in order\nto use CMSIncrementalMode.\n");
1745 status = false;
1746 } else {
1747 status = status && verify_percentage(CMSIncrementalDutyCycle,
1748 "CMSIncrementalDutyCycle");
1749 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1750 "CMSIncrementalDutyCycleMin");
1751 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1752 "CMSIncrementalSafetyFactor");
1753 status = status && verify_percentage(CMSIncrementalOffset,
1754 "CMSIncrementalOffset");
1755 status = status && verify_percentage(CMSExpAvgFactor,
1756 "CMSExpAvgFactor");
1757 // If it was not set on the command line, set
1758 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1759 if (CMSInitiatingOccupancyFraction < 0) {
1760 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1761 }
1762 }
1763 }
1764
1765 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1766 // insists that we hold the requisite locks so that the iteration is
1767 // MT-safe. For the verification at start-up and shut-down, we don't
1768 // yet have a good way of acquiring and releasing these locks,
1769 // which are not visible at the CollectedHeap level. We want to
1770 // be able to acquire these locks and then do the iteration rather
1771 // than just disable the lock verification. This will be fixed under
1772 // bug 4788986.
1773 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1774 if (VerifyGCStartAt == 0) {
1775 warning("Heap verification at start-up disabled "
1776 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1777 VerifyGCStartAt = 1; // Disable verification at start-up
1778 }
1779 if (VerifyBeforeExit) {
1780 warning("Heap verification at shutdown disabled "
1781 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1782 VerifyBeforeExit = false; // Disable verification at shutdown
1783 }
1784 }
1785
1786 // Note: only executed in non-PRODUCT mode
1787 if (!UseAsyncConcMarkSweepGC &&
1788 (ExplicitGCInvokesConcurrent ||
1789 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1790 jio_fprintf(defaultStream::error_stream(),
1791 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1792 " with -UseAsyncConcMarkSweepGC");
1793 status = false;
1794 }
1795
1796 if (UseG1GC) {
1797 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1798 "InitiatingHeapOccupancyPercent");
1799 }
1800
1801 status = status && verify_interval(RefDiscoveryPolicy,
1802 ReferenceProcessor::DiscoveryPolicyMin,
1803 ReferenceProcessor::DiscoveryPolicyMax,
1804 "RefDiscoveryPolicy");
1805
1806 // Limit the lower bound of this flag to 1 as it is used in a division
1807 // expression.
1808 status = status && verify_interval(TLABWasteTargetPercent,
1809 1, 100, "TLABWasteTargetPercent");
1810
1811 return status;
1812 }
1813
1814 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1815 const char* option_type) {
1816 if (ignore) return false;
1817
1818 const char* spacer = " ";
1819 if (option_type == NULL) {
1820 option_type = ++spacer; // Set both to the empty string.
1821 }
1822
1823 if (os::obsolete_option(option)) {
1824 jio_fprintf(defaultStream::error_stream(),
1825 "Obsolete %s%soption: %s\n", option_type, spacer,
1826 option->optionString);
1827 return false;
1828 } else {
1829 jio_fprintf(defaultStream::error_stream(),
1830 "Unrecognized %s%soption: %s\n", option_type, spacer,
1831 option->optionString);
1832 return true;
1833 }
1834 }
1835
1836 static const char* user_assertion_options[] = {
1837 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1838 };
1839
1840 static const char* system_assertion_options[] = {
1841 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1842 };
1843
1844 // Return true if any of the strings in null-terminated array 'names' matches.
1845 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1846 // the option must match exactly.
1847 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1848 bool tail_allowed) {
1849 for (/* empty */; *names != NULL; ++names) {
1850 if (match_option(option, *names, tail)) {
1851 if (**tail == '\0' || tail_allowed && **tail == ':') {
1852 return true;
1853 }
1854 }
1855 }
1856 return false;
1857 }
1858
1859 bool Arguments::parse_uintx(const char* value,
1860 uintx* uintx_arg,
1861 uintx min_size) {
1862
1863 // Check the sign first since atomull() parses only unsigned values.
1864 bool value_is_positive = !(*value == '-');
1865
1866 if (value_is_positive) {
1867 julong n;
1868 bool good_return = atomull(value, &n);
1869 if (good_return) {
1870 bool above_minimum = n >= min_size;
1871 bool value_is_too_large = n > max_uintx;
1872
1873 if (above_minimum && !value_is_too_large) {
1874 *uintx_arg = n;
1875 return true;
1876 }
1877 }
1878 }
1879 return false;
1880 }
1881
1882 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1883 julong* long_arg,
1884 julong min_size) {
1885 if (!atomull(s, long_arg)) return arg_unreadable;
1886 return check_memory_size(*long_arg, min_size);
1887 }
1888
1889 // Parse JavaVMInitArgs structure
1890
1891 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1892 // For components of the system classpath.
1893 SysClassPath scp(Arguments::get_sysclasspath());
1894 bool scp_assembly_required = false;
1895
1896 // Save default settings for some mode flags
1897 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1898 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1899 Arguments::_ClipInlining = ClipInlining;
1900 Arguments::_BackgroundCompilation = BackgroundCompilation;
1901 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1902
1903 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1904 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1905 if (result != JNI_OK) {
1906 return result;
1907 }
1908
1909 // Parse JavaVMInitArgs structure passed in
1910 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1911 if (result != JNI_OK) {
1912 return result;
1913 }
1914
1915 if (AggressiveOpts) {
1916 // Insert alt-rt.jar between user-specified bootclasspath
1917 // prefix and the default bootclasspath. os::set_boot_path()
1918 // uses meta_index_dir as the default bootclasspath directory.
1919 const char* altclasses_jar = "alt-rt.jar";
1920 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1921 strlen(altclasses_jar);
1922 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1923 strcpy(altclasses_path, get_meta_index_dir());
1924 strcat(altclasses_path, altclasses_jar);
1925 scp.add_suffix_to_prefix(altclasses_path);
1926 scp_assembly_required = true;
1927 FREE_C_HEAP_ARRAY(char, altclasses_path);
1928 }
1929
1930 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1931 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1932 if (result != JNI_OK) {
1933 return result;
1934 }
1935
1936 // Do final processing now that all arguments have been parsed
1937 result = finalize_vm_init_args(&scp, scp_assembly_required);
1938 if (result != JNI_OK) {
1939 return result;
1940 }
1941
1942 return JNI_OK;
1943 }
1944
1945 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1946 SysClassPath* scp_p,
1947 bool* scp_assembly_required_p,
1948 FlagValueOrigin origin) {
1949 // Remaining part of option string
1950 const char* tail;
1951
1952 // iterate over arguments
1953 for (int index = 0; index < args->nOptions; index++) {
1954 bool is_absolute_path = false; // for -agentpath vs -agentlib
1955
1956 const JavaVMOption* option = args->options + index;
1957
1958 if (!match_option(option, "-Djava.class.path", &tail) &&
1959 !match_option(option, "-Dsun.java.command", &tail) &&
1960 !match_option(option, "-Dsun.java.launcher", &tail)) {
1961
1962 // add all jvm options to the jvm_args string. This string
1963 // is used later to set the java.vm.args PerfData string constant.
1964 // the -Djava.class.path and the -Dsun.java.command options are
1965 // omitted from jvm_args string as each have their own PerfData
1966 // string constant object.
1967 build_jvm_args(option->optionString);
1968 }
1969
1970 // -verbose:[class/gc/jni]
1971 if (match_option(option, "-verbose", &tail)) {
1972 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1973 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1974 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1975 } else if (!strcmp(tail, ":gc")) {
1976 FLAG_SET_CMDLINE(bool, PrintGC, true);
1977 } else if (!strcmp(tail, ":jni")) {
1978 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1979 }
1980 // -da / -ea / -disableassertions / -enableassertions
1981 // These accept an optional class/package name separated by a colon, e.g.,
1982 // -da:java.lang.Thread.
1983 } else if (match_option(option, user_assertion_options, &tail, true)) {
1984 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1985 if (*tail == '\0') {
1986 JavaAssertions::setUserClassDefault(enable);
1987 } else {
1988 assert(*tail == ':', "bogus match by match_option()");
1989 JavaAssertions::addOption(tail + 1, enable);
1990 }
1991 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1992 } else if (match_option(option, system_assertion_options, &tail, false)) {
1993 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1994 JavaAssertions::setSystemClassDefault(enable);
1995 // -bootclasspath:
1996 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1997 scp_p->reset_path(tail);
1998 *scp_assembly_required_p = true;
1999 // -bootclasspath/a:
2000 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2001 scp_p->add_suffix(tail);
2002 *scp_assembly_required_p = true;
2003 // -bootclasspath/p:
2004 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2005 scp_p->add_prefix(tail);
2006 *scp_assembly_required_p = true;
2007 // -Xrun
2008 } else if (match_option(option, "-Xrun", &tail)) {
2009 if (tail != NULL) {
2010 const char* pos = strchr(tail, ':');
2011 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2012 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2013 name[len] = '\0';
2014
2015 char *options = NULL;
2016 if(pos != NULL) {
2017 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2018 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2019 }
2020 #ifdef JVMTI_KERNEL
2021 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2022 warning("profiling and debugging agents are not supported with Kernel VM");
2023 } else
2024 #endif // JVMTI_KERNEL
2025 add_init_library(name, options);
2026 }
2027 // -agentlib and -agentpath
2028 } else if (match_option(option, "-agentlib:", &tail) ||
2029 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2030 if(tail != NULL) {
2031 const char* pos = strchr(tail, '=');
2032 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2033 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2034 name[len] = '\0';
2035
2036 char *options = NULL;
2037 if(pos != NULL) {
2038 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2039 }
2040 #ifdef JVMTI_KERNEL
2041 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2042 warning("profiling and debugging agents are not supported with Kernel VM");
2043 } else
2044 #endif // JVMTI_KERNEL
2045 add_init_agent(name, options, is_absolute_path);
2046
2047 }
2048 // -javaagent
2049 } else if (match_option(option, "-javaagent:", &tail)) {
2050 if(tail != NULL) {
2051 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2052 add_init_agent("instrument", options, false);
2053 }
2054 // -Xnoclassgc
2055 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2056 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2057 // -Xincgc: i-CMS
2058 } else if (match_option(option, "-Xincgc", &tail)) {
2059 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2060 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2061 // -Xnoincgc: no i-CMS
2062 } else if (match_option(option, "-Xnoincgc", &tail)) {
2063 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2064 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2065 // -Xconcgc
2066 } else if (match_option(option, "-Xconcgc", &tail)) {
2067 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2068 // -Xnoconcgc
2069 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2070 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2071 // -Xbatch
2072 } else if (match_option(option, "-Xbatch", &tail)) {
2073 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2074 // -Xmn for compatibility with other JVM vendors
2075 } else if (match_option(option, "-Xmn", &tail)) {
2076 julong long_initial_eden_size = 0;
2077 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2078 if (errcode != arg_in_range) {
2079 jio_fprintf(defaultStream::error_stream(),
2080 "Invalid initial eden size: %s\n", option->optionString);
2081 describe_range_error(errcode);
2082 return JNI_EINVAL;
2083 }
2084 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2085 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2086 // -Xms
2087 } else if (match_option(option, "-Xms", &tail)) {
2088 julong long_initial_heap_size = 0;
2089 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2090 if (errcode != arg_in_range) {
2091 jio_fprintf(defaultStream::error_stream(),
2092 "Invalid initial heap size: %s\n", option->optionString);
2093 describe_range_error(errcode);
2094 return JNI_EINVAL;
2095 }
2096 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2097 // Currently the minimum size and the initial heap sizes are the same.
2098 set_min_heap_size(InitialHeapSize);
2099 // -Xmx
2100 } else if (match_option(option, "-Xmx", &tail)) {
2101 julong long_max_heap_size = 0;
2102 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2103 if (errcode != arg_in_range) {
2104 jio_fprintf(defaultStream::error_stream(),
2105 "Invalid maximum heap size: %s\n", option->optionString);
2106 describe_range_error(errcode);
2107 return JNI_EINVAL;
2108 }
2109 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2110 // Xmaxf
2111 } else if (match_option(option, "-Xmaxf", &tail)) {
2112 int maxf = (int)(atof(tail) * 100);
2113 if (maxf < 0 || maxf > 100) {
2114 jio_fprintf(defaultStream::error_stream(),
2115 "Bad max heap free percentage size: %s\n",
2116 option->optionString);
2117 return JNI_EINVAL;
2118 } else {
2119 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2120 }
2121 // Xminf
2122 } else if (match_option(option, "-Xminf", &tail)) {
2123 int minf = (int)(atof(tail) * 100);
2124 if (minf < 0 || minf > 100) {
2125 jio_fprintf(defaultStream::error_stream(),
2126 "Bad min heap free percentage size: %s\n",
2127 option->optionString);
2128 return JNI_EINVAL;
2129 } else {
2130 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2131 }
2132 // -Xss
2133 } else if (match_option(option, "-Xss", &tail)) {
2134 julong long_ThreadStackSize = 0;
2135 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2136 if (errcode != arg_in_range) {
2137 jio_fprintf(defaultStream::error_stream(),
2138 "Invalid thread stack size: %s\n", option->optionString);
2139 describe_range_error(errcode);
2140 return JNI_EINVAL;
2141 }
2142 // Internally track ThreadStackSize in units of 1024 bytes.
2143 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2144 round_to((int)long_ThreadStackSize, K) / K);
2145 // -Xoss
2146 } else if (match_option(option, "-Xoss", &tail)) {
2147 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2148 // -Xmaxjitcodesize
2149 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2150 julong long_ReservedCodeCacheSize = 0;
2151 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2152 (size_t)InitialCodeCacheSize);
2153 if (errcode != arg_in_range) {
2154 jio_fprintf(defaultStream::error_stream(),
2155 "Invalid maximum code cache size: %s\n",
2156 option->optionString);
2157 describe_range_error(errcode);
2158 return JNI_EINVAL;
2159 }
2160 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2161 // -green
2162 } else if (match_option(option, "-green", &tail)) {
2163 jio_fprintf(defaultStream::error_stream(),
2164 "Green threads support not available\n");
2165 return JNI_EINVAL;
2166 // -native
2167 } else if (match_option(option, "-native", &tail)) {
2168 // HotSpot always uses native threads, ignore silently for compatibility
2169 // -Xsqnopause
2170 } else if (match_option(option, "-Xsqnopause", &tail)) {
2171 // EVM option, ignore silently for compatibility
2172 // -Xrs
2173 } else if (match_option(option, "-Xrs", &tail)) {
2174 // Classic/EVM option, new functionality
2175 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2176 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2177 // change default internal VM signals used - lower case for back compat
2178 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2179 // -Xoptimize
2180 } else if (match_option(option, "-Xoptimize", &tail)) {
2181 // EVM option, ignore silently for compatibility
2182 // -Xprof
2183 } else if (match_option(option, "-Xprof", &tail)) {
2184 #ifndef FPROF_KERNEL
2185 _has_profile = true;
2186 #else // FPROF_KERNEL
2187 // do we have to exit?
2188 warning("Kernel VM does not support flat profiling.");
2189 #endif // FPROF_KERNEL
2190 // -Xaprof
2191 } else if (match_option(option, "-Xaprof", &tail)) {
2192 _has_alloc_profile = true;
2193 // -Xconcurrentio
2194 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2195 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2196 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2197 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2198 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2199 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2200
2201 // -Xinternalversion
2202 } else if (match_option(option, "-Xinternalversion", &tail)) {
2203 jio_fprintf(defaultStream::output_stream(), "%s\n",
2204 VM_Version::internal_vm_info_string());
2205 vm_exit(0);
2206 #ifndef PRODUCT
2207 // -Xprintflags
2208 } else if (match_option(option, "-Xprintflags", &tail)) {
2209 CommandLineFlags::printFlags();
2210 vm_exit(0);
2211 #endif
2212 // -D
2213 } else if (match_option(option, "-D", &tail)) {
2214 if (!add_property(tail)) {
2215 return JNI_ENOMEM;
2216 }
2217 // Out of the box management support
2218 if (match_option(option, "-Dcom.sun.management", &tail)) {
2219 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2220 }
2221 // -Xint
2222 } else if (match_option(option, "-Xint", &tail)) {
2223 set_mode_flags(_int);
2224 // -Xmixed
2225 } else if (match_option(option, "-Xmixed", &tail)) {
2226 set_mode_flags(_mixed);
2227 // -Xcomp
2228 } else if (match_option(option, "-Xcomp", &tail)) {
2229 // for testing the compiler; turn off all flags that inhibit compilation
2230 set_mode_flags(_comp);
2231
2232 // -Xshare:dump
2233 } else if (match_option(option, "-Xshare:dump", &tail)) {
2234 #ifdef TIERED
2235 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2236 set_mode_flags(_int); // Prevent compilation, which creates objects
2237 #elif defined(COMPILER2)
2238 vm_exit_during_initialization(
2239 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2240 #elif defined(KERNEL)
2241 vm_exit_during_initialization(
2242 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2243 #else
2244 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2245 set_mode_flags(_int); // Prevent compilation, which creates objects
2246 #endif
2247 // -Xshare:on
2248 } else if (match_option(option, "-Xshare:on", &tail)) {
2249 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2250 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2251 #ifdef TIERED
2252 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2253 #endif // TIERED
2254 // -Xshare:auto
2255 } else if (match_option(option, "-Xshare:auto", &tail)) {
2256 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2257 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2258 // -Xshare:off
2259 } else if (match_option(option, "-Xshare:off", &tail)) {
2260 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2261 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2262
2263 // -Xverify
2264 } else if (match_option(option, "-Xverify", &tail)) {
2265 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2266 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2267 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2268 } else if (strcmp(tail, ":remote") == 0) {
2269 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2270 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2271 } else if (strcmp(tail, ":none") == 0) {
2272 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2273 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2274 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2275 return JNI_EINVAL;
2276 }
2277 // -Xdebug
2278 } else if (match_option(option, "-Xdebug", &tail)) {
2279 // note this flag has been used, then ignore
2280 set_xdebug_mode(true);
2281 // -Xnoagent
2282 } else if (match_option(option, "-Xnoagent", &tail)) {
2283 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2284 } else if (match_option(option, "-Xboundthreads", &tail)) {
2285 // Bind user level threads to kernel threads (Solaris only)
2286 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2287 } else if (match_option(option, "-Xloggc:", &tail)) {
2288 // Redirect GC output to the file. -Xloggc:<filename>
2289 // ostream_init_log(), when called will use this filename
2290 // to initialize a fileStream.
2291 _gc_log_filename = strdup(tail);
2292 FLAG_SET_CMDLINE(bool, PrintGC, true);
2293 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2294 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2295
2296 // JNI hooks
2297 } else if (match_option(option, "-Xcheck", &tail)) {
2298 if (!strcmp(tail, ":jni")) {
2299 CheckJNICalls = true;
2300 } else if (is_bad_option(option, args->ignoreUnrecognized,
2301 "check")) {
2302 return JNI_EINVAL;
2303 }
2304 } else if (match_option(option, "vfprintf", &tail)) {
2305 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2306 } else if (match_option(option, "exit", &tail)) {
2307 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2308 } else if (match_option(option, "abort", &tail)) {
2309 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2310 // -XX:+AggressiveHeap
2311 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2312
2313 // This option inspects the machine and attempts to set various
2314 // parameters to be optimal for long-running, memory allocation
2315 // intensive jobs. It is intended for machines with large
2316 // amounts of cpu and memory.
2317
2318 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2319 // VM, but we may not be able to represent the total physical memory
2320 // available (like having 8gb of memory on a box but using a 32bit VM).
2321 // Thus, we need to make sure we're using a julong for intermediate
2322 // calculations.
2323 julong initHeapSize;
2324 julong total_memory = os::physical_memory();
2325
2326 if (total_memory < (julong)256*M) {
2327 jio_fprintf(defaultStream::error_stream(),
2328 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2329 vm_exit(1);
2330 }
2331
2332 // The heap size is half of available memory, or (at most)
2333 // all of possible memory less 160mb (leaving room for the OS
2334 // when using ISM). This is the maximum; because adaptive sizing
2335 // is turned on below, the actual space used may be smaller.
2336
2337 initHeapSize = MIN2(total_memory / (julong)2,
2338 total_memory - (julong)160*M);
2339
2340 // Make sure that if we have a lot of memory we cap the 32 bit
2341 // process space. The 64bit VM version of this function is a nop.
2342 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2343
2344 // The perm gen is separate but contiguous with the
2345 // object heap (and is reserved with it) so subtract it
2346 // from the heap size.
2347 if (initHeapSize > MaxPermSize) {
2348 initHeapSize = initHeapSize - MaxPermSize;
2349 } else {
2350 warning("AggressiveHeap and MaxPermSize values may conflict");
2351 }
2352
2353 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2354 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2355 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2356 // Currently the minimum size and the initial heap sizes are the same.
2357 set_min_heap_size(initHeapSize);
2358 }
2359 if (FLAG_IS_DEFAULT(NewSize)) {
2360 // Make the young generation 3/8ths of the total heap.
2361 FLAG_SET_CMDLINE(uintx, NewSize,
2362 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2363 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2364 }
2365
2366 FLAG_SET_DEFAULT(UseLargePages, true);
2367
2368 // Increase some data structure sizes for efficiency
2369 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2370 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2371 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2372
2373 // See the OldPLABSize comment below, but replace 'after promotion'
2374 // with 'after copying'. YoungPLABSize is the size of the survivor
2375 // space per-gc-thread buffers. The default is 4kw.
2376 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2377
2378 // OldPLABSize is the size of the buffers in the old gen that
2379 // UseParallelGC uses to promote live data that doesn't fit in the
2380 // survivor spaces. At any given time, there's one for each gc thread.
2381 // The default size is 1kw. These buffers are rarely used, since the
2382 // survivor spaces are usually big enough. For specjbb, however, there
2383 // are occasions when there's lots of live data in the young gen
2384 // and we end up promoting some of it. We don't have a definite
2385 // explanation for why bumping OldPLABSize helps, but the theory
2386 // is that a bigger PLAB results in retaining something like the
2387 // original allocation order after promotion, which improves mutator
2388 // locality. A minor effect may be that larger PLABs reduce the
2389 // number of PLAB allocation events during gc. The value of 8kw
2390 // was arrived at by experimenting with specjbb.
2391 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2392
2393 // CompilationPolicyChoice=0 causes the server compiler to adopt
2394 // a more conservative which-method-do-I-compile policy when one
2395 // of the counters maintained by the interpreter trips. The
2396 // result is reduced startup time and improved specjbb and
2397 // alacrity performance. Zero is the default, but we set it
2398 // explicitly here in case the default changes.
2399 // See runtime/compilationPolicy.*.
2400 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2401
2402 // Enable parallel GC and adaptive generation sizing
2403 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2404 FLAG_SET_DEFAULT(ParallelGCThreads,
2405 Abstract_VM_Version::parallel_worker_threads());
2406
2407 // Encourage steady state memory management
2408 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2409
2410 // This appears to improve mutator locality
2411 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2412
2413 // Get around early Solaris scheduling bug
2414 // (affinity vs other jobs on system)
2415 // but disallow DR and offlining (5008695).
2416 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2417
2418 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2419 // The last option must always win.
2420 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2421 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2422 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2423 // The last option must always win.
2424 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2425 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2426 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2427 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Please use CMSClassUnloadingEnabled in place of "
2430 "CMSPermGenSweepingEnabled in the future\n");
2431 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2432 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Please use -XX:+UseGCOverheadLimit in place of "
2435 "-XX:+UseGCTimeLimit in the future\n");
2436 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2437 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Please use -XX:-UseGCOverheadLimit in place of "
2440 "-XX:-UseGCTimeLimit in the future\n");
2441 // The TLE options are for compatibility with 1.3 and will be
2442 // removed without notice in a future release. These options
2443 // are not to be documented.
2444 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2445 // No longer used.
2446 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2447 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2448 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2449 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2450 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2451 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2452 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2453 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2454 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2455 // No longer used.
2456 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2457 julong long_tlab_size = 0;
2458 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2459 if (errcode != arg_in_range) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Invalid TLAB size: %s\n", option->optionString);
2462 describe_range_error(errcode);
2463 return JNI_EINVAL;
2464 }
2465 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2466 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2467 // No longer used.
2468 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2469 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2470 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2471 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2472 SOLARIS_ONLY(
2473 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2474 warning("-XX:+UsePermISM is obsolete.");
2475 FLAG_SET_CMDLINE(bool, UseISM, true);
2476 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2477 FLAG_SET_CMDLINE(bool, UseISM, false);
2478 )
2479 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2480 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2481 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2482 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2483 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2484 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2485 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2486 #ifdef SOLARIS
2487 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2488 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2489 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2490 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2491 #else // ndef SOLARIS
2492 jio_fprintf(defaultStream::error_stream(),
2493 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2494 return JNI_EINVAL;
2495 #endif // ndef SOLARIS
2496 #ifdef ASSERT
2497 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2498 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2499 // disable scavenge before parallel mark-compact
2500 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2501 #endif
2502 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2503 julong cms_blocks_to_claim = (julong)atol(tail);
2504 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2505 jio_fprintf(defaultStream::error_stream(),
2506 "Please use -XX:OldPLABSize in place of "
2507 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2508 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2509 julong cms_blocks_to_claim = (julong)atol(tail);
2510 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Please use -XX:OldPLABSize in place of "
2513 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2514 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2515 julong old_plab_size = 0;
2516 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2517 if (errcode != arg_in_range) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Invalid old PLAB size: %s\n", option->optionString);
2520 describe_range_error(errcode);
2521 return JNI_EINVAL;
2522 }
2523 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Please use -XX:OldPLABSize in place of "
2526 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2527 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2528 julong young_plab_size = 0;
2529 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2530 if (errcode != arg_in_range) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Invalid young PLAB size: %s\n", option->optionString);
2533 describe_range_error(errcode);
2534 return JNI_EINVAL;
2535 }
2536 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Please use -XX:YoungPLABSize in place of "
2539 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2540 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2541 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2542 julong stack_size = 0;
2543 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2544 if (errcode != arg_in_range) {
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Invalid mark stack size: %s\n", option->optionString);
2547 describe_range_error(errcode);
2548 return JNI_EINVAL;
2549 }
2550 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2551 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2552 julong max_stack_size = 0;
2553 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2554 if (errcode != arg_in_range) {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Invalid maximum mark stack size: %s\n",
2557 option->optionString);
2558 describe_range_error(errcode);
2559 return JNI_EINVAL;
2560 }
2561 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2562 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2563 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2564 uintx conc_threads = 0;
2565 if (!parse_uintx(tail, &conc_threads, 1)) {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "Invalid concurrent threads: %s\n", option->optionString);
2568 return JNI_EINVAL;
2569 }
2570 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2571 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2572 // Skip -XX:Flags= since that case has already been handled
2573 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2574 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2575 return JNI_EINVAL;
2576 }
2577 }
2578 // Unknown option
2579 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2580 return JNI_ERR;
2581 }
2582 }
2583 // Change the default value for flags which have different default values
2584 // when working with older JDKs.
2585 if (JDK_Version::current().compare_major(6) <= 0 &&
2586 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2587 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2588 }
2589 return JNI_OK;
2590 }
2591
2592 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2593 // This must be done after all -D arguments have been processed.
2594 scp_p->expand_endorsed();
2595
2596 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2597 // Assemble the bootclasspath elements into the final path.
2598 Arguments::set_sysclasspath(scp_p->combined_path());
2599 }
2600
2601 // This must be done after all arguments have been processed.
2602 // java_compiler() true means set to "NONE" or empty.
2603 if (java_compiler() && !xdebug_mode()) {
2604 // For backwards compatibility, we switch to interpreted mode if
2605 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2606 // not specified.
2607 set_mode_flags(_int);
2608 }
2609 if (CompileThreshold == 0) {
2610 set_mode_flags(_int);
2611 }
2612
2613 #ifdef TIERED
2614 // If we are using tiered compilation in the tiered vm then c1 will
2615 // do the profiling and we don't want to waste that time in the
2616 // interpreter.
2617 if (TieredCompilation) {
2618 ProfileInterpreter = false;
2619 } else {
2620 // Since we are running vanilla server we must adjust the compile threshold
2621 // unless the user has already adjusted it because the default threshold assumes
2622 // we will run tiered.
2623
2624 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2625 CompileThreshold = Tier2CompileThreshold;
2626 }
2627 }
2628 #endif // TIERED
2629
2630 #ifndef COMPILER2
2631 // Don't degrade server performance for footprint
2632 if (FLAG_IS_DEFAULT(UseLargePages) &&
2633 MaxHeapSize < LargePageHeapSizeThreshold) {
2634 // No need for large granularity pages w/small heaps.
2635 // Note that large pages are enabled/disabled for both the
2636 // Java heap and the code cache.
2637 FLAG_SET_DEFAULT(UseLargePages, false);
2638 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2639 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2640 }
2641
2642 // Tiered compilation is undefined with C1.
2643 TieredCompilation = false;
2644
2645 #else
2646 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2647 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2648 }
2649 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2650 if (UseG1GC) {
2651 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2652 }
2653 #endif
2654
2655 if (!check_vm_args_consistency()) {
2656 return JNI_ERR;
2657 }
2658
2659 return JNI_OK;
2660 }
2661
2662 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2663 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2664 scp_assembly_required_p);
2665 }
2666
2667 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2668 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2669 scp_assembly_required_p);
2670 }
2671
2672 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2673 const int N_MAX_OPTIONS = 64;
2674 const int OPTION_BUFFER_SIZE = 1024;
2675 char buffer[OPTION_BUFFER_SIZE];
2676
2677 // The variable will be ignored if it exceeds the length of the buffer.
2678 // Don't check this variable if user has special privileges
2679 // (e.g. unix su command).
2680 if (os::getenv(name, buffer, sizeof(buffer)) &&
2681 !os::have_special_privileges()) {
2682 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Picked up %s: %s\n", name, buffer);
2685 char* rd = buffer; // pointer to the input string (rd)
2686 int i;
2687 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2688 while (isspace(*rd)) rd++; // skip whitespace
2689 if (*rd == 0) break; // we re done when the input string is read completely
2690
2691 // The output, option string, overwrites the input string.
2692 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2693 // input string (rd).
2694 char* wrt = rd;
2695
2696 options[i++].optionString = wrt; // Fill in option
2697 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2698 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2699 int quote = *rd; // matching quote to look for
2700 rd++; // don't copy open quote
2701 while (*rd != quote) { // include everything (even spaces) up until quote
2702 if (*rd == 0) { // string termination means unmatched string
2703 jio_fprintf(defaultStream::error_stream(),
2704 "Unmatched quote in %s\n", name);
2705 return JNI_ERR;
2706 }
2707 *wrt++ = *rd++; // copy to option string
2708 }
2709 rd++; // don't copy close quote
2710 } else {
2711 *wrt++ = *rd++; // copy to option string
2712 }
2713 }
2714 // Need to check if we're done before writing a NULL,
2715 // because the write could be to the byte that rd is pointing to.
2716 if (*rd++ == 0) {
2717 *wrt = 0;
2718 break;
2719 }
2720 *wrt = 0; // Zero terminate option
2721 }
2722 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2723 JavaVMInitArgs vm_args;
2724 vm_args.version = JNI_VERSION_1_2;
2725 vm_args.options = options;
2726 vm_args.nOptions = i;
2727 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2728
2729 if (PrintVMOptions) {
2730 const char* tail;
2731 for (int i = 0; i < vm_args.nOptions; i++) {
2732 const JavaVMOption *option = vm_args.options + i;
2733 if (match_option(option, "-XX:", &tail)) {
2734 logOption(tail);
2735 }
2736 }
2737 }
2738
2739 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2740 }
2741 return JNI_OK;
2742 }
2743
2744 // Parse entry point called from JNI_CreateJavaVM
2745
2746 jint Arguments::parse(const JavaVMInitArgs* args) {
2747
2748 // Sharing support
2749 // Construct the path to the archive
2750 char jvm_path[JVM_MAXPATHLEN];
2751 os::jvm_path(jvm_path, sizeof(jvm_path));
2752 #ifdef TIERED
2753 if (strstr(jvm_path, "client") != NULL) {
2754 force_client_mode = true;
2755 }
2756 #endif // TIERED
2757 char *end = strrchr(jvm_path, *os::file_separator());
2758 if (end != NULL) *end = '\0';
2759 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2760 strlen(os::file_separator()) + 20);
2761 if (shared_archive_path == NULL) return JNI_ENOMEM;
2762 strcpy(shared_archive_path, jvm_path);
2763 strcat(shared_archive_path, os::file_separator());
2764 strcat(shared_archive_path, "classes");
2765 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2766 strcat(shared_archive_path, ".jsa");
2767 SharedArchivePath = shared_archive_path;
2768
2769 // Remaining part of option string
2770 const char* tail;
2771
2772 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2773 bool settings_file_specified = false;
2774 const char* flags_file;
2775 int index;
2776 for (index = 0; index < args->nOptions; index++) {
2777 const JavaVMOption *option = args->options + index;
2778 if (match_option(option, "-XX:Flags=", &tail)) {
2779 flags_file = tail;
2780 settings_file_specified = true;
2781 }
2782 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2783 PrintVMOptions = true;
2784 }
2785 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2786 PrintVMOptions = false;
2787 }
2788 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2789 IgnoreUnrecognizedVMOptions = true;
2790 }
2791 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2792 IgnoreUnrecognizedVMOptions = false;
2793 }
2794 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2795 CommandLineFlags::printFlags();
2796 vm_exit(0);
2797 }
2798 }
2799
2800 if (IgnoreUnrecognizedVMOptions) {
2801 // uncast const to modify the flag args->ignoreUnrecognized
2802 *(jboolean*)(&args->ignoreUnrecognized) = true;
2803 }
2804
2805 // Parse specified settings file
2806 if (settings_file_specified) {
2807 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2808 return JNI_EINVAL;
2809 }
2810 }
2811
2812 // Parse default .hotspotrc settings file
2813 if (!settings_file_specified) {
2814 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2815 return JNI_EINVAL;
2816 }
2817 }
2818
2819 if (PrintVMOptions) {
2820 for (index = 0; index < args->nOptions; index++) {
2821 const JavaVMOption *option = args->options + index;
2822 if (match_option(option, "-XX:", &tail)) {
2823 logOption(tail);
2824 }
2825 }
2826 }
2827
2828 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2829 jint result = parse_vm_init_args(args);
2830 if (result != JNI_OK) {
2831 return result;
2832 }
2833
2834 #ifndef PRODUCT
2835 if (TraceBytecodesAt != 0) {
2836 TraceBytecodes = true;
2837 }
2838 if (CountCompiledCalls) {
2839 if (UseCounterDecay) {
2840 warning("UseCounterDecay disabled because CountCalls is set");
2841 UseCounterDecay = false;
2842 }
2843 }
2844 #endif // PRODUCT
2845
2846 if (EnableInvokeDynamic && !EnableMethodHandles) {
2847 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2848 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2849 }
2850 EnableMethodHandles = true;
2851 }
2852 if (EnableMethodHandles && !AnonymousClasses) {
2853 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2854 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2855 }
2856 AnonymousClasses = true;
2857 }
2858 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2859 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2860 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2861 }
2862 ScavengeRootsInCode = 1;
2863 }
2864 #ifdef COMPILER2
2865 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2866 // TODO: We need to find rules for invokedynamic and EA. For now,
2867 // simply disable EA by default.
2868 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2869 DoEscapeAnalysis = false;
2870 }
2871 }
2872 #endif
2873
2874 if (PrintGCDetails) {
2875 // Turn on -verbose:gc options as well
2876 PrintGC = true;
2877 }
2878
2879 #if defined(_LP64) && defined(COMPILER1)
2880 UseCompressedOops = false;
2881 #endif
2882
2883 #ifdef SERIALGC
2884 force_serial_gc();
2885 #endif // SERIALGC
2886 #ifdef KERNEL
2887 no_shared_spaces();
2888 #endif // KERNEL
2889
2890 // Set flags based on ergonomics.
2891 set_ergonomics_flags();
2892
2893 #ifdef _LP64
2894 // XXX JSR 292 currently does not support compressed oops.
2895 if (EnableMethodHandles && UseCompressedOops) {
2896 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2897 UseCompressedOops = false;
2898 }
2899 }
2900 #endif // _LP64
2901
2902 // Check the GC selections again.
2903 if (!check_gc_consistency()) {
2904 return JNI_EINVAL;
2905 }
2906
2907 #ifndef KERNEL
2908 if (UseConcMarkSweepGC) {
2909 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
2910 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2911 // are true, we don't call set_parnew_gc_flags() as well.
2912 set_cms_and_parnew_gc_flags();
2913 } else {
2914 // Set heap size based on available physical memory
2915 set_heap_size();
2916 // Set per-collector flags
2917 if (UseParallelGC || UseParallelOldGC) {
2918 set_parallel_gc_flags();
2919 } else if (UseParNewGC) {
2920 set_parnew_gc_flags();
2921 } else if (UseG1GC) {
2922 set_g1_gc_flags();
2923 }
2924 }
2925 #endif // KERNEL
2926
2927 #ifdef SERIALGC
2928 assert(verify_serial_gc_flags(), "SerialGC unset");
2929 #endif // SERIALGC
2930
2931 // Set bytecode rewriting flags
2932 set_bytecode_flags();
2933
2934 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2935 set_aggressive_opts_flags();
2936
2937 #ifdef CC_INTERP
2938 // Clear flags not supported by the C++ interpreter
2939 FLAG_SET_DEFAULT(ProfileInterpreter, false);
2940 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2941 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
2942 #endif // CC_INTERP
2943
2944 #ifdef ZERO
2945 // Clear flags not supported by Zero
2946 FLAG_SET_DEFAULT(TaggedStackInterpreter, false);
2947 #endif // ZERO
2948
2949 #ifdef COMPILER2
2950 if (!UseBiasedLocking || EmitSync != 0) {
2951 UseOptoBiasInlining = false;
2952 }
2953 #endif
2954
2955 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
2956 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
2957 DebugNonSafepoints = true;
2958 }
2959
2960 #ifndef PRODUCT
2961 if (CompileTheWorld) {
2962 // Force NmethodSweeper to sweep whole CodeCache each time.
2963 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
2964 NmethodSweepFraction = 1;
2965 }
2966 }
2967 #endif
2968
2969 if (PrintCommandLineFlags) {
2970 CommandLineFlags::printSetFlags();
2971 }
2972
2973 if (PrintFlagsFinal) {
2974 CommandLineFlags::printFlags();
2975 }
2976
2977 return JNI_OK;
2978 }
2979
2980 int Arguments::PropertyList_count(SystemProperty* pl) {
2981 int count = 0;
2982 while(pl != NULL) {
2983 count++;
2984 pl = pl->next();
2985 }
2986 return count;
2987 }
2988
2989 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2990 assert(key != NULL, "just checking");
2991 SystemProperty* prop;
2992 for (prop = pl; prop != NULL; prop = prop->next()) {
2993 if (strcmp(key, prop->key()) == 0) return prop->value();
2994 }
2995 return NULL;
2996 }
2997
2998 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2999 int count = 0;
3000 const char* ret_val = NULL;
3001
3002 while(pl != NULL) {
3003 if(count >= index) {
3004 ret_val = pl->key();
3005 break;
3006 }
3007 count++;
3008 pl = pl->next();
3009 }
3010
3011 return ret_val;
3012 }
3013
3014 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3015 int count = 0;
3016 char* ret_val = NULL;
3017
3018 while(pl != NULL) {
3019 if(count >= index) {
3020 ret_val = pl->value();
3021 break;
3022 }
3023 count++;
3024 pl = pl->next();
3025 }
3026
3027 return ret_val;
3028 }
3029
3030 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3031 SystemProperty* p = *plist;
3032 if (p == NULL) {
3033 *plist = new_p;
3034 } else {
3035 while (p->next() != NULL) {
3036 p = p->next();
3037 }
3038 p->set_next(new_p);
3039 }
3040 }
3041
3042 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3043 if (plist == NULL)
3044 return;
3045
3046 SystemProperty* new_p = new SystemProperty(k, v, true);
3047 PropertyList_add(plist, new_p);
3048 }
3049
3050 // This add maintains unique property key in the list.
3051 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3052 if (plist == NULL)
3053 return;
3054
3055 // If property key exist then update with new value.
3056 SystemProperty* prop;
3057 for (prop = *plist; prop != NULL; prop = prop->next()) {
3058 if (strcmp(k, prop->key()) == 0) {
3059 if (append) {
3060 prop->append_value(v);
3061 } else {
3062 prop->set_value(v);
3063 }
3064 return;
3065 }
3066 }
3067
3068 PropertyList_add(plist, k, v);
3069 }
3070
3071 #ifdef KERNEL
3072 char *Arguments::get_kernel_properties() {
3073 // Find properties starting with kernel and append them to string
3074 // We need to find out how long they are first because the URL's that they
3075 // might point to could get long.
3076 int length = 0;
3077 SystemProperty* prop;
3078 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3079 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3080 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3081 }
3082 }
3083 // Add one for null terminator.
3084 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3085 if (length != 0) {
3086 int pos = 0;
3087 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3088 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3089 jio_snprintf(&props[pos], length-pos,
3090 "-D%s=%s ", prop->key(), prop->value());
3091 pos = strlen(props);
3092 }
3093 }
3094 }
3095 // null terminate props in case of null
3096 props[length] = '\0';
3097 return props;
3098 }
3099 #endif // KERNEL
3100
3101 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3102 // Returns true if all of the source pointed by src has been copied over to
3103 // the destination buffer pointed by buf. Otherwise, returns false.
3104 // Notes:
3105 // 1. If the length (buflen) of the destination buffer excluding the
3106 // NULL terminator character is not long enough for holding the expanded
3107 // pid characters, it also returns false instead of returning the partially
3108 // expanded one.
3109 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3110 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3111 char* buf, size_t buflen) {
3112 const char* p = src;
3113 char* b = buf;
3114 const char* src_end = &src[srclen];
3115 char* buf_end = &buf[buflen - 1];
3116
3117 while (p < src_end && b < buf_end) {
3118 if (*p == '%') {
3119 switch (*(++p)) {
3120 case '%': // "%%" ==> "%"
3121 *b++ = *p++;
3122 break;
3123 case 'p': { // "%p" ==> current process id
3124 // buf_end points to the character before the last character so
3125 // that we could write '\0' to the end of the buffer.
3126 size_t buf_sz = buf_end - b + 1;
3127 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3128
3129 // if jio_snprintf fails or the buffer is not long enough to hold
3130 // the expanded pid, returns false.
3131 if (ret < 0 || ret >= (int)buf_sz) {
3132 return false;
3133 } else {
3134 b += ret;
3135 assert(*b == '\0', "fail in copy_expand_pid");
3136 if (p == src_end && b == buf_end + 1) {
3137 // reach the end of the buffer.
3138 return true;
3139 }
3140 }
3141 p++;
3142 break;
3143 }
3144 default :
3145 *b++ = '%';
3146 }
3147 } else {
3148 *b++ = *p++;
3149 }
3150 }
3151 *b = '\0';
3152 return (p == src_end); // return false if not all of the source was copied
3153 }