Sat, 23 Oct 2010 23:03:49 -0700
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
Summary: Deprecated HandlePromotionFailure, removing the ability to turn off that feature, did away with one epoch look-ahead when deciding if a scavenge is likely to fail, relying on current data.
Reviewed-by: jmasa, johnc, poonam
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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_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;
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;
54 char* Arguments::SharedArchivePath = NULL;
56 AgentLibraryList Arguments::_libraryList;
57 AgentLibraryList Arguments::_agentList;
59 abort_hook_t Arguments::_abort_hook = NULL;
60 exit_hook_t Arguments::_exit_hook = NULL;
61 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
64 SystemProperty *Arguments::_java_ext_dirs = NULL;
65 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
66 SystemProperty *Arguments::_sun_boot_library_path = NULL;
67 SystemProperty *Arguments::_java_library_path = NULL;
68 SystemProperty *Arguments::_java_home = NULL;
69 SystemProperty *Arguments::_java_class_path = NULL;
70 SystemProperty *Arguments::_sun_boot_class_path = NULL;
72 char* Arguments::_meta_index_path = NULL;
73 char* Arguments::_meta_index_dir = NULL;
75 static bool force_client_mode = false;
77 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
79 static bool match_option(const JavaVMOption *option, const char* name,
80 const char** tail) {
81 int len = (int)strlen(name);
82 if (strncmp(option->optionString, name, len) == 0) {
83 *tail = option->optionString + len;
84 return true;
85 } else {
86 return false;
87 }
88 }
90 static void logOption(const char* opt) {
91 if (PrintVMOptions) {
92 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
93 }
94 }
96 // Process java launcher properties.
97 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
98 // See if sun.java.launcher or sun.java.launcher.pid is defined.
99 // Must do this before setting up other system properties,
100 // as some of them may depend on launcher type.
101 for (int index = 0; index < args->nOptions; index++) {
102 const JavaVMOption* option = args->options + index;
103 const char* tail;
105 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
106 process_java_launcher_argument(tail, option->extraInfo);
107 continue;
108 }
109 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
110 _sun_java_launcher_pid = atoi(tail);
111 continue;
112 }
113 }
114 }
116 // Initialize system properties key and value.
117 void Arguments::init_system_properties() {
119 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
121 "Java Virtual Machine Specification", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
123 JDK_Version::is_gte_jdk17x_version() ? "Oracle Corporation" : "Sun Microsystems Inc.", false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
125 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
129 // following are JVMTI agent writeable properties.
130 // Properties values are set to NULL and they are
131 // os specific they are initialized in os::init_system_properties_values().
132 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
133 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
134 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
135 _java_library_path = new SystemProperty("java.library.path", NULL, true);
136 _java_home = new SystemProperty("java.home", NULL, true);
137 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
139 _java_class_path = new SystemProperty("java.class.path", "", true);
141 // Add to System Property list.
142 PropertyList_add(&_system_properties, _java_ext_dirs);
143 PropertyList_add(&_system_properties, _java_endorsed_dirs);
144 PropertyList_add(&_system_properties, _sun_boot_library_path);
145 PropertyList_add(&_system_properties, _java_library_path);
146 PropertyList_add(&_system_properties, _java_home);
147 PropertyList_add(&_system_properties, _java_class_path);
148 PropertyList_add(&_system_properties, _sun_boot_class_path);
150 // Set OS specific system properties values
151 os::init_system_properties_values();
152 }
154 /**
155 * Provide a slightly more user-friendly way of eliminating -XX flags.
156 * When a flag is eliminated, it can be added to this list in order to
157 * continue accepting this flag on the command-line, while issuing a warning
158 * and ignoring the value. Once the JDK version reaches the 'accept_until'
159 * limit, we flatly refuse to admit the existence of the flag. This allows
160 * a flag to die correctly over JDK releases using HSX.
161 */
162 typedef struct {
163 const char* name;
164 JDK_Version obsoleted_in; // when the flag went away
165 JDK_Version accept_until; // which version to start denying the existence
166 } ObsoleteFlag;
168 static ObsoleteFlag obsolete_jvm_flags[] = {
169 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
170 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
171 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
183 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
184 { "DefaultInitialRAMFraction",
185 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
186 { "UseDepthFirstScavengeOrder",
187 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
188 { "HandlePromotionFailure",
189 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
190 { "MaxLiveObjectEvacuationRatio",
191 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
192 { NULL, JDK_Version(0), JDK_Version(0) }
193 };
195 // Returns true if the flag is obsolete and fits into the range specified
196 // for being ignored. In the case that the flag is ignored, the 'version'
197 // value is filled in with the version number when the flag became
198 // obsolete so that that value can be displayed to the user.
199 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
200 int i = 0;
201 assert(version != NULL, "Must provide a version buffer");
202 while (obsolete_jvm_flags[i].name != NULL) {
203 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
204 // <flag>=xxx form
205 // [-|+]<flag> form
206 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
207 ((s[0] == '+' || s[0] == '-') &&
208 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
209 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
210 *version = flag_status.obsoleted_in;
211 return true;
212 }
213 }
214 i++;
215 }
216 return false;
217 }
219 // Constructs the system class path (aka boot class path) from the following
220 // components, in order:
221 //
222 // prefix // from -Xbootclasspath/p:...
223 // endorsed // the expansion of -Djava.endorsed.dirs=...
224 // base // from os::get_system_properties() or -Xbootclasspath=
225 // suffix // from -Xbootclasspath/a:...
226 //
227 // java.endorsed.dirs is a list of directories; any jar or zip files in the
228 // directories are added to the sysclasspath just before the base.
229 //
230 // This could be AllStatic, but it isn't needed after argument processing is
231 // complete.
232 class SysClassPath: public StackObj {
233 public:
234 SysClassPath(const char* base);
235 ~SysClassPath();
237 inline void set_base(const char* base);
238 inline void add_prefix(const char* prefix);
239 inline void add_suffix_to_prefix(const char* suffix);
240 inline void add_suffix(const char* suffix);
241 inline void reset_path(const char* base);
243 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
244 // property. Must be called after all command-line arguments have been
245 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
246 // combined_path().
247 void expand_endorsed();
249 inline const char* get_base() const { return _items[_scp_base]; }
250 inline const char* get_prefix() const { return _items[_scp_prefix]; }
251 inline const char* get_suffix() const { return _items[_scp_suffix]; }
252 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
254 // Combine all the components into a single c-heap-allocated string; caller
255 // must free the string if/when no longer needed.
256 char* combined_path();
258 private:
259 // Utility routines.
260 static char* add_to_path(const char* path, const char* str, bool prepend);
261 static char* add_jars_to_path(char* path, const char* directory);
263 inline void reset_item_at(int index);
265 // Array indices for the items that make up the sysclasspath. All except the
266 // base are allocated in the C heap and freed by this class.
267 enum {
268 _scp_prefix, // from -Xbootclasspath/p:...
269 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
270 _scp_base, // the default sysclasspath
271 _scp_suffix, // from -Xbootclasspath/a:...
272 _scp_nitems // the number of items, must be last.
273 };
275 const char* _items[_scp_nitems];
276 DEBUG_ONLY(bool _expansion_done;)
277 };
279 SysClassPath::SysClassPath(const char* base) {
280 memset(_items, 0, sizeof(_items));
281 _items[_scp_base] = base;
282 DEBUG_ONLY(_expansion_done = false;)
283 }
285 SysClassPath::~SysClassPath() {
286 // Free everything except the base.
287 for (int i = 0; i < _scp_nitems; ++i) {
288 if (i != _scp_base) reset_item_at(i);
289 }
290 DEBUG_ONLY(_expansion_done = false;)
291 }
293 inline void SysClassPath::set_base(const char* base) {
294 _items[_scp_base] = base;
295 }
297 inline void SysClassPath::add_prefix(const char* prefix) {
298 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
299 }
301 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
302 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
303 }
305 inline void SysClassPath::add_suffix(const char* suffix) {
306 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
307 }
309 inline void SysClassPath::reset_item_at(int index) {
310 assert(index < _scp_nitems && index != _scp_base, "just checking");
311 if (_items[index] != NULL) {
312 FREE_C_HEAP_ARRAY(char, _items[index]);
313 _items[index] = NULL;
314 }
315 }
317 inline void SysClassPath::reset_path(const char* base) {
318 // Clear the prefix and suffix.
319 reset_item_at(_scp_prefix);
320 reset_item_at(_scp_suffix);
321 set_base(base);
322 }
324 //------------------------------------------------------------------------------
326 void SysClassPath::expand_endorsed() {
327 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
329 const char* path = Arguments::get_property("java.endorsed.dirs");
330 if (path == NULL) {
331 path = Arguments::get_endorsed_dir();
332 assert(path != NULL, "no default for java.endorsed.dirs");
333 }
335 char* expanded_path = NULL;
336 const char separator = *os::path_separator();
337 const char* const end = path + strlen(path);
338 while (path < end) {
339 const char* tmp_end = strchr(path, separator);
340 if (tmp_end == NULL) {
341 expanded_path = add_jars_to_path(expanded_path, path);
342 path = end;
343 } else {
344 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
345 memcpy(dirpath, path, tmp_end - path);
346 dirpath[tmp_end - path] = '\0';
347 expanded_path = add_jars_to_path(expanded_path, dirpath);
348 FREE_C_HEAP_ARRAY(char, dirpath);
349 path = tmp_end + 1;
350 }
351 }
352 _items[_scp_endorsed] = expanded_path;
353 DEBUG_ONLY(_expansion_done = true;)
354 }
356 // Combine the bootclasspath elements, some of which may be null, into a single
357 // c-heap-allocated string.
358 char* SysClassPath::combined_path() {
359 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
360 assert(_expansion_done, "must call expand_endorsed() first.");
362 size_t lengths[_scp_nitems];
363 size_t total_len = 0;
365 const char separator = *os::path_separator();
367 // Get the lengths.
368 int i;
369 for (i = 0; i < _scp_nitems; ++i) {
370 if (_items[i] != NULL) {
371 lengths[i] = strlen(_items[i]);
372 // Include space for the separator char (or a NULL for the last item).
373 total_len += lengths[i] + 1;
374 }
375 }
376 assert(total_len > 0, "empty sysclasspath not allowed");
378 // Copy the _items to a single string.
379 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
380 char* cp_tmp = cp;
381 for (i = 0; i < _scp_nitems; ++i) {
382 if (_items[i] != NULL) {
383 memcpy(cp_tmp, _items[i], lengths[i]);
384 cp_tmp += lengths[i];
385 *cp_tmp++ = separator;
386 }
387 }
388 *--cp_tmp = '\0'; // Replace the extra separator.
389 return cp;
390 }
392 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
393 char*
394 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
395 char *cp;
397 assert(str != NULL, "just checking");
398 if (path == NULL) {
399 size_t len = strlen(str) + 1;
400 cp = NEW_C_HEAP_ARRAY(char, len);
401 memcpy(cp, str, len); // copy the trailing null
402 } else {
403 const char separator = *os::path_separator();
404 size_t old_len = strlen(path);
405 size_t str_len = strlen(str);
406 size_t len = old_len + str_len + 2;
408 if (prepend) {
409 cp = NEW_C_HEAP_ARRAY(char, len);
410 char* cp_tmp = cp;
411 memcpy(cp_tmp, str, str_len);
412 cp_tmp += str_len;
413 *cp_tmp = separator;
414 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
415 FREE_C_HEAP_ARRAY(char, path);
416 } else {
417 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
418 char* cp_tmp = cp + old_len;
419 *cp_tmp = separator;
420 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
421 }
422 }
423 return cp;
424 }
426 // Scan the directory and append any jar or zip files found to path.
427 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
428 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
429 DIR* dir = os::opendir(directory);
430 if (dir == NULL) return path;
432 char dir_sep[2] = { '\0', '\0' };
433 size_t directory_len = strlen(directory);
434 const char fileSep = *os::file_separator();
435 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
437 /* Scan the directory for jars/zips, appending them to path. */
438 struct dirent *entry;
439 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
440 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
441 const char* name = entry->d_name;
442 const char* ext = name + strlen(name) - 4;
443 bool isJarOrZip = ext > name &&
444 (os::file_name_strcmp(ext, ".jar") == 0 ||
445 os::file_name_strcmp(ext, ".zip") == 0);
446 if (isJarOrZip) {
447 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
448 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
449 path = add_to_path(path, jarpath, false);
450 FREE_C_HEAP_ARRAY(char, jarpath);
451 }
452 }
453 FREE_C_HEAP_ARRAY(char, dbuf);
454 os::closedir(dir);
455 return path;
456 }
458 // Parses a memory size specification string.
459 static bool atomull(const char *s, julong* result) {
460 julong n = 0;
461 int args_read = sscanf(s, os::julong_format_specifier(), &n);
462 if (args_read != 1) {
463 return false;
464 }
465 while (*s != '\0' && isdigit(*s)) {
466 s++;
467 }
468 // 4705540: illegal if more characters are found after the first non-digit
469 if (strlen(s) > 1) {
470 return false;
471 }
472 switch (*s) {
473 case 'T': case 't':
474 *result = n * G * K;
475 // Check for overflow.
476 if (*result/((julong)G * K) != n) return false;
477 return true;
478 case 'G': case 'g':
479 *result = n * G;
480 if (*result/G != n) return false;
481 return true;
482 case 'M': case 'm':
483 *result = n * M;
484 if (*result/M != n) return false;
485 return true;
486 case 'K': case 'k':
487 *result = n * K;
488 if (*result/K != n) return false;
489 return true;
490 case '\0':
491 *result = n;
492 return true;
493 default:
494 return false;
495 }
496 }
498 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
499 if (size < min_size) return arg_too_small;
500 // Check that size will fit in a size_t (only relevant on 32-bit)
501 if (size > max_uintx) return arg_too_big;
502 return arg_in_range;
503 }
505 // Describe an argument out of range error
506 void Arguments::describe_range_error(ArgsRange errcode) {
507 switch(errcode) {
508 case arg_too_big:
509 jio_fprintf(defaultStream::error_stream(),
510 "The specified size exceeds the maximum "
511 "representable size.\n");
512 break;
513 case arg_too_small:
514 case arg_unreadable:
515 case arg_in_range:
516 // do nothing for now
517 break;
518 default:
519 ShouldNotReachHere();
520 }
521 }
523 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
524 return CommandLineFlags::boolAtPut(name, &value, origin);
525 }
527 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
528 double v;
529 if (sscanf(value, "%lf", &v) != 1) {
530 return false;
531 }
533 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
534 return true;
535 }
536 return false;
537 }
539 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
540 julong v;
541 intx intx_v;
542 bool is_neg = false;
543 // Check the sign first since atomull() parses only unsigned values.
544 if (*value == '-') {
545 if (!CommandLineFlags::intxAt(name, &intx_v)) {
546 return false;
547 }
548 value++;
549 is_neg = true;
550 }
551 if (!atomull(value, &v)) {
552 return false;
553 }
554 intx_v = (intx) v;
555 if (is_neg) {
556 intx_v = -intx_v;
557 }
558 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
559 return true;
560 }
561 uintx uintx_v = (uintx) v;
562 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
563 return true;
564 }
565 uint64_t uint64_t_v = (uint64_t) v;
566 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
567 return true;
568 }
569 return false;
570 }
572 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
573 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
574 // Contract: CommandLineFlags always returns a pointer that needs freeing.
575 FREE_C_HEAP_ARRAY(char, value);
576 return true;
577 }
579 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
580 const char* old_value = "";
581 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
582 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
583 size_t new_len = strlen(new_value);
584 const char* value;
585 char* free_this_too = NULL;
586 if (old_len == 0) {
587 value = new_value;
588 } else if (new_len == 0) {
589 value = old_value;
590 } else {
591 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
592 // each new setting adds another LINE to the switch:
593 sprintf(buf, "%s\n%s", old_value, new_value);
594 value = buf;
595 free_this_too = buf;
596 }
597 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
598 // CommandLineFlags always returns a pointer that needs freeing.
599 FREE_C_HEAP_ARRAY(char, value);
600 if (free_this_too != NULL) {
601 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
602 FREE_C_HEAP_ARRAY(char, free_this_too);
603 }
604 return true;
605 }
607 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
609 // range of acceptable characters spelled out for portability reasons
610 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
611 #define BUFLEN 255
612 char name[BUFLEN+1];
613 char dummy;
615 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
616 return set_bool_flag(name, false, origin);
617 }
618 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
619 return set_bool_flag(name, true, origin);
620 }
622 char punct;
623 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
624 const char* value = strchr(arg, '=') + 1;
625 Flag* flag = Flag::find_flag(name, strlen(name));
626 if (flag != NULL && flag->is_ccstr()) {
627 if (flag->ccstr_accumulates()) {
628 return append_to_string_flag(name, value, origin);
629 } else {
630 if (value[0] == '\0') {
631 value = NULL;
632 }
633 return set_string_flag(name, value, origin);
634 }
635 }
636 }
638 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
639 const char* value = strchr(arg, '=') + 1;
640 // -XX:Foo:=xxx will reset the string flag to the given value.
641 if (value[0] == '\0') {
642 value = NULL;
643 }
644 return set_string_flag(name, value, origin);
645 }
647 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
648 #define SIGNED_NUMBER_RANGE "[-0123456789]"
649 #define NUMBER_RANGE "[0123456789]"
650 char value[BUFLEN + 1];
651 char value2[BUFLEN + 1];
652 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
653 // Looks like a floating-point number -- try again with more lenient format string
654 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
655 return set_fp_numeric_flag(name, value, origin);
656 }
657 }
659 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
660 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
661 return set_numeric_flag(name, value, origin);
662 }
664 return false;
665 }
667 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
668 assert(bldarray != NULL, "illegal argument");
670 if (arg == NULL) {
671 return;
672 }
674 int index = *count;
676 // expand the array and add arg to the last element
677 (*count)++;
678 if (*bldarray == NULL) {
679 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
680 } else {
681 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
682 }
683 (*bldarray)[index] = strdup(arg);
684 }
686 void Arguments::build_jvm_args(const char* arg) {
687 add_string(&_jvm_args_array, &_num_jvm_args, arg);
688 }
690 void Arguments::build_jvm_flags(const char* arg) {
691 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
692 }
694 // utility function to return a string that concatenates all
695 // strings in a given char** array
696 const char* Arguments::build_resource_string(char** args, int count) {
697 if (args == NULL || count == 0) {
698 return NULL;
699 }
700 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
701 for (int i = 1; i < count; i++) {
702 length += strlen(args[i]) + 1; // add 1 for a space
703 }
704 char* s = NEW_RESOURCE_ARRAY(char, length);
705 strcpy(s, args[0]);
706 for (int j = 1; j < count; j++) {
707 strcat(s, " ");
708 strcat(s, args[j]);
709 }
710 return (const char*) s;
711 }
713 void Arguments::print_on(outputStream* st) {
714 st->print_cr("VM Arguments:");
715 if (num_jvm_flags() > 0) {
716 st->print("jvm_flags: "); print_jvm_flags_on(st);
717 }
718 if (num_jvm_args() > 0) {
719 st->print("jvm_args: "); print_jvm_args_on(st);
720 }
721 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
722 st->print_cr("Launcher Type: %s", _sun_java_launcher);
723 }
725 void Arguments::print_jvm_flags_on(outputStream* st) {
726 if (_num_jvm_flags > 0) {
727 for (int i=0; i < _num_jvm_flags; i++) {
728 st->print("%s ", _jvm_flags_array[i]);
729 }
730 st->print_cr("");
731 }
732 }
734 void Arguments::print_jvm_args_on(outputStream* st) {
735 if (_num_jvm_args > 0) {
736 for (int i=0; i < _num_jvm_args; i++) {
737 st->print("%s ", _jvm_args_array[i]);
738 }
739 st->print_cr("");
740 }
741 }
743 bool Arguments::process_argument(const char* arg,
744 jboolean ignore_unrecognized, FlagValueOrigin origin) {
746 JDK_Version since = JDK_Version();
748 if (parse_argument(arg, origin)) {
749 // do nothing
750 } else if (is_newly_obsolete(arg, &since)) {
751 enum { bufsize = 256 };
752 char buffer[bufsize];
753 since.to_string(buffer, bufsize);
754 jio_fprintf(defaultStream::error_stream(),
755 "Warning: The flag %s has been EOL'd as of %s and will"
756 " be ignored\n", arg, buffer);
757 } else {
758 if (!ignore_unrecognized) {
759 jio_fprintf(defaultStream::error_stream(),
760 "Unrecognized VM option '%s'\n", arg);
761 // allow for commandline "commenting out" options like -XX:#+Verbose
762 if (strlen(arg) == 0 || arg[0] != '#') {
763 return false;
764 }
765 }
766 }
767 return true;
768 }
770 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
771 FILE* stream = fopen(file_name, "rb");
772 if (stream == NULL) {
773 if (should_exist) {
774 jio_fprintf(defaultStream::error_stream(),
775 "Could not open settings file %s\n", file_name);
776 return false;
777 } else {
778 return true;
779 }
780 }
782 char token[1024];
783 int pos = 0;
785 bool in_white_space = true;
786 bool in_comment = false;
787 bool in_quote = false;
788 char quote_c = 0;
789 bool result = true;
791 int c = getc(stream);
792 while(c != EOF) {
793 if (in_white_space) {
794 if (in_comment) {
795 if (c == '\n') in_comment = false;
796 } else {
797 if (c == '#') in_comment = true;
798 else if (!isspace(c)) {
799 in_white_space = false;
800 token[pos++] = c;
801 }
802 }
803 } else {
804 if (c == '\n' || (!in_quote && isspace(c))) {
805 // token ends at newline, or at unquoted whitespace
806 // this allows a way to include spaces in string-valued options
807 token[pos] = '\0';
808 logOption(token);
809 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
810 build_jvm_flags(token);
811 pos = 0;
812 in_white_space = true;
813 in_quote = false;
814 } else if (!in_quote && (c == '\'' || c == '"')) {
815 in_quote = true;
816 quote_c = c;
817 } else if (in_quote && (c == quote_c)) {
818 in_quote = false;
819 } else {
820 token[pos++] = c;
821 }
822 }
823 c = getc(stream);
824 }
825 if (pos > 0) {
826 token[pos] = '\0';
827 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
828 build_jvm_flags(token);
829 }
830 fclose(stream);
831 return result;
832 }
834 //=============================================================================================================
835 // Parsing of properties (-D)
837 const char* Arguments::get_property(const char* key) {
838 return PropertyList_get_value(system_properties(), key);
839 }
841 bool Arguments::add_property(const char* prop) {
842 const char* eq = strchr(prop, '=');
843 char* key;
844 // ns must be static--its address may be stored in a SystemProperty object.
845 const static char ns[1] = {0};
846 char* value = (char *)ns;
848 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
849 key = AllocateHeap(key_len + 1, "add_property");
850 strncpy(key, prop, key_len);
851 key[key_len] = '\0';
853 if (eq != NULL) {
854 size_t value_len = strlen(prop) - key_len - 1;
855 value = AllocateHeap(value_len + 1, "add_property");
856 strncpy(value, &prop[key_len + 1], value_len + 1);
857 }
859 if (strcmp(key, "java.compiler") == 0) {
860 process_java_compiler_argument(value);
861 FreeHeap(key);
862 if (eq != NULL) {
863 FreeHeap(value);
864 }
865 return true;
866 } else if (strcmp(key, "sun.java.command") == 0) {
867 _java_command = value;
869 // don't add this property to the properties exposed to the java application
870 FreeHeap(key);
871 return true;
872 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
873 // launcher.pid property is private and is processed
874 // in process_sun_java_launcher_properties();
875 // the sun.java.launcher property is passed on to the java application
876 FreeHeap(key);
877 if (eq != NULL) {
878 FreeHeap(value);
879 }
880 return true;
881 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
882 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
883 // its value without going through the property list or making a Java call.
884 _java_vendor_url_bug = value;
885 } else if (strcmp(key, "sun.boot.library.path") == 0) {
886 PropertyList_unique_add(&_system_properties, key, value, true);
887 return true;
888 }
889 // Create new property and add at the end of the list
890 PropertyList_unique_add(&_system_properties, key, value);
891 return true;
892 }
894 //===========================================================================================================
895 // Setting int/mixed/comp mode flags
897 void Arguments::set_mode_flags(Mode mode) {
898 // Set up default values for all flags.
899 // If you add a flag to any of the branches below,
900 // add a default value for it here.
901 set_java_compiler(false);
902 _mode = mode;
904 // Ensure Agent_OnLoad has the correct initial values.
905 // This may not be the final mode; mode may change later in onload phase.
906 PropertyList_unique_add(&_system_properties, "java.vm.info",
907 (char*)Abstract_VM_Version::vm_info_string(), false);
909 UseInterpreter = true;
910 UseCompiler = true;
911 UseLoopCounter = true;
913 // Default values may be platform/compiler dependent -
914 // use the saved values
915 ClipInlining = Arguments::_ClipInlining;
916 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
917 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
918 BackgroundCompilation = Arguments::_BackgroundCompilation;
920 // Change from defaults based on mode
921 switch (mode) {
922 default:
923 ShouldNotReachHere();
924 break;
925 case _int:
926 UseCompiler = false;
927 UseLoopCounter = false;
928 AlwaysCompileLoopMethods = false;
929 UseOnStackReplacement = false;
930 break;
931 case _mixed:
932 // same as default
933 break;
934 case _comp:
935 UseInterpreter = false;
936 BackgroundCompilation = false;
937 ClipInlining = false;
938 break;
939 }
940 }
942 // Conflict: required to use shared spaces (-Xshare:on), but
943 // incompatible command line options were chosen.
945 static void no_shared_spaces() {
946 if (RequireSharedSpaces) {
947 jio_fprintf(defaultStream::error_stream(),
948 "Class data sharing is inconsistent with other specified options.\n");
949 vm_exit_during_initialization("Unable to use shared archive.", NULL);
950 } else {
951 FLAG_SET_DEFAULT(UseSharedSpaces, false);
952 }
953 }
955 void Arguments::set_tiered_flags() {
956 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
957 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
958 }
960 if (CompilationPolicyChoice < 2) {
961 vm_exit_during_initialization(
962 "Incompatible compilation policy selected", NULL);
963 }
965 #ifdef _LP64
966 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
967 UseCompressedOops = false;
968 }
969 if (UseCompressedOops) {
970 vm_exit_during_initialization(
971 "Tiered compilation is not supported with compressed oops yet", NULL);
972 }
973 #endif
974 // Increase the code cache size - tiered compiles a lot more.
975 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
976 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
977 }
978 }
980 #ifndef KERNEL
981 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
982 // if it's not explictly set or unset. If the user has chosen
983 // UseParNewGC and not explicitly set ParallelGCThreads we
984 // set it, unless this is a single cpu machine.
985 void Arguments::set_parnew_gc_flags() {
986 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
987 "control point invariant");
988 assert(UseParNewGC, "Error");
990 // Turn off AdaptiveSizePolicy by default for parnew until it is
991 // complete.
992 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
993 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
994 }
996 if (ParallelGCThreads == 0) {
997 FLAG_SET_DEFAULT(ParallelGCThreads,
998 Abstract_VM_Version::parallel_worker_threads());
999 if (ParallelGCThreads == 1) {
1000 FLAG_SET_DEFAULT(UseParNewGC, false);
1001 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1002 }
1003 }
1004 if (UseParNewGC) {
1005 // CDS doesn't work with ParNew yet
1006 no_shared_spaces();
1008 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1009 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1010 // we set them to 1024 and 1024.
1011 // See CR 6362902.
1012 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1013 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1014 }
1015 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1016 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1017 }
1019 // AlwaysTenure flag should make ParNew promote all at first collection.
1020 // See CR 6362902.
1021 if (AlwaysTenure) {
1022 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1023 }
1024 // When using compressed oops, we use local overflow stacks,
1025 // rather than using a global overflow list chained through
1026 // the klass word of the object's pre-image.
1027 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1028 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1029 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1030 }
1031 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1032 }
1033 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1034 }
1035 }
1037 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1038 // sparc/solaris for certain applications, but would gain from
1039 // further optimization and tuning efforts, and would almost
1040 // certainly gain from analysis of platform and environment.
1041 void Arguments::set_cms_and_parnew_gc_flags() {
1042 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1043 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1045 // If we are using CMS, we prefer to UseParNewGC,
1046 // unless explicitly forbidden.
1047 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1048 FLAG_SET_ERGO(bool, UseParNewGC, true);
1049 }
1051 // Turn off AdaptiveSizePolicy by default for cms until it is
1052 // complete.
1053 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1054 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1055 }
1057 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1058 // as needed.
1059 if (UseParNewGC) {
1060 set_parnew_gc_flags();
1061 }
1063 // Now make adjustments for CMS
1064 size_t young_gen_per_worker;
1065 intx new_ratio;
1066 size_t min_new_default;
1067 intx tenuring_default;
1068 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1069 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1070 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1071 }
1072 young_gen_per_worker = 4*M;
1073 new_ratio = (intx)15;
1074 min_new_default = 4*M;
1075 tenuring_default = (intx)0;
1076 } else { // new defaults: "new" as of 6.0
1077 young_gen_per_worker = CMSYoungGenPerWorker;
1078 new_ratio = (intx)7;
1079 min_new_default = 16*M;
1080 tenuring_default = (intx)4;
1081 }
1083 // Preferred young gen size for "short" pauses
1084 const uintx parallel_gc_threads =
1085 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1086 const size_t preferred_max_new_size_unaligned =
1087 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1088 const size_t preferred_max_new_size =
1089 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1091 // Unless explicitly requested otherwise, size young gen
1092 // for "short" pauses ~ 4M*ParallelGCThreads
1094 // If either MaxNewSize or NewRatio is set on the command line,
1095 // assume the user is trying to set the size of the young gen.
1097 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1099 // Set MaxNewSize to our calculated preferred_max_new_size unless
1100 // NewSize was set on the command line and it is larger than
1101 // preferred_max_new_size.
1102 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1103 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1104 } else {
1105 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1106 }
1107 if (PrintGCDetails && Verbose) {
1108 // Too early to use gclog_or_tty
1109 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1110 }
1112 // Unless explicitly requested otherwise, prefer a large
1113 // Old to Young gen size so as to shift the collection load
1114 // to the old generation concurrent collector
1116 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1117 // then NewSize and OldSize may be calculated. That would
1118 // generally lead to some differences with ParNewGC for which
1119 // there was no obvious reason. Also limit to the case where
1120 // MaxNewSize has not been set.
1122 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1124 // Code along this path potentially sets NewSize and OldSize
1126 // Calculate the desired minimum size of the young gen but if
1127 // NewSize has been set on the command line, use it here since
1128 // it should be the final value.
1129 size_t min_new;
1130 if (FLAG_IS_DEFAULT(NewSize)) {
1131 min_new = align_size_up(ScaleForWordSize(min_new_default),
1132 os::vm_page_size());
1133 } else {
1134 min_new = NewSize;
1135 }
1136 size_t prev_initial_size = InitialHeapSize;
1137 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1138 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1139 // Currently minimum size and the initial heap sizes are the same.
1140 set_min_heap_size(InitialHeapSize);
1141 if (PrintGCDetails && Verbose) {
1142 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1143 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1144 InitialHeapSize/M, prev_initial_size/M);
1145 }
1146 }
1148 // MaxHeapSize is aligned down in collectorPolicy
1149 size_t max_heap =
1150 align_size_down(MaxHeapSize,
1151 CardTableRS::ct_max_alignment_constraint());
1153 if (PrintGCDetails && Verbose) {
1154 // Too early to use gclog_or_tty
1155 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1156 " initial_heap_size: " SIZE_FORMAT
1157 " max_heap: " SIZE_FORMAT,
1158 min_heap_size(), InitialHeapSize, max_heap);
1159 }
1160 if (max_heap > min_new) {
1161 // Unless explicitly requested otherwise, make young gen
1162 // at least min_new, and at most preferred_max_new_size.
1163 if (FLAG_IS_DEFAULT(NewSize)) {
1164 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1165 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1166 if (PrintGCDetails && Verbose) {
1167 // Too early to use gclog_or_tty
1168 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1169 }
1170 }
1171 // Unless explicitly requested otherwise, size old gen
1172 // so that it's at least 3X of NewSize to begin with;
1173 // later NewRatio will decide how it grows; see above.
1174 if (FLAG_IS_DEFAULT(OldSize)) {
1175 if (max_heap > NewSize) {
1176 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1177 if (PrintGCDetails && Verbose) {
1178 // Too early to use gclog_or_tty
1179 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1180 }
1181 }
1182 }
1183 }
1184 }
1185 // Unless explicitly requested otherwise, definitely
1186 // promote all objects surviving "tenuring_default" scavenges.
1187 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1188 FLAG_IS_DEFAULT(SurvivorRatio)) {
1189 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1190 }
1191 // If we decided above (or user explicitly requested)
1192 // `promote all' (via MaxTenuringThreshold := 0),
1193 // prefer minuscule survivor spaces so as not to waste
1194 // space for (non-existent) survivors
1195 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1196 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1197 }
1198 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1199 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1200 // This is done in order to make ParNew+CMS configuration to work
1201 // with YoungPLABSize and OldPLABSize options.
1202 // See CR 6362902.
1203 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1204 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1205 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1206 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1207 // the value (either from the command line or ergonomics) of
1208 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1209 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1210 } else {
1211 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1212 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1213 // we'll let it to take precedence.
1214 jio_fprintf(defaultStream::error_stream(),
1215 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1216 " options are specified for the CMS collector."
1217 " CMSParPromoteBlocksToClaim will take precedence.\n");
1218 }
1219 }
1220 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1221 // OldPLAB sizing manually turned off: Use a larger default setting,
1222 // unless it was manually specified. This is because a too-low value
1223 // will slow down scavenges.
1224 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1225 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1226 }
1227 }
1228 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1229 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1230 // If either of the static initialization defaults have changed, note this
1231 // modification.
1232 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1233 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1234 }
1235 if (PrintGCDetails && Verbose) {
1236 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1237 MarkStackSize / K, MarkStackSizeMax / K);
1238 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1239 }
1240 }
1241 #endif // KERNEL
1243 void set_object_alignment() {
1244 // Object alignment.
1245 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1246 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1247 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1248 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1249 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1250 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1252 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1253 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1255 // Oop encoding heap max
1256 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1258 #ifndef KERNEL
1259 // Set CMS global values
1260 CompactibleFreeListSpace::set_cms_values();
1261 #endif // KERNEL
1262 }
1264 bool verify_object_alignment() {
1265 // Object alignment.
1266 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1267 jio_fprintf(defaultStream::error_stream(),
1268 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1269 (int)ObjectAlignmentInBytes);
1270 return false;
1271 }
1272 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1273 jio_fprintf(defaultStream::error_stream(),
1274 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1275 (int)ObjectAlignmentInBytes, BytesPerLong);
1276 return false;
1277 }
1278 // It does not make sense to have big object alignment
1279 // since a space lost due to alignment will be greater
1280 // then a saved space from compressed oops.
1281 if ((int)ObjectAlignmentInBytes > 256) {
1282 jio_fprintf(defaultStream::error_stream(),
1283 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1284 (int)ObjectAlignmentInBytes);
1285 return false;
1286 }
1287 // In case page size is very small.
1288 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1291 (int)ObjectAlignmentInBytes, os::vm_page_size());
1292 return false;
1293 }
1294 return true;
1295 }
1297 inline uintx max_heap_for_compressed_oops() {
1298 // Heap should be above HeapBaseMinAddress to get zero based compressed oops.
1299 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size() - HeapBaseMinAddress);
1300 NOT_LP64(ShouldNotReachHere(); return 0);
1301 }
1303 bool Arguments::should_auto_select_low_pause_collector() {
1304 if (UseAutoGCSelectPolicy &&
1305 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1306 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1307 if (PrintGCDetails) {
1308 // Cannot use gclog_or_tty yet.
1309 tty->print_cr("Automatic selection of the low pause collector"
1310 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1311 }
1312 return true;
1313 }
1314 return false;
1315 }
1317 void Arguments::set_ergonomics_flags() {
1318 // Parallel GC is not compatible with sharing. If one specifies
1319 // that they want sharing explicitly, do not set ergonomics flags.
1320 if (DumpSharedSpaces || ForceSharedSpaces) {
1321 return;
1322 }
1324 if (os::is_server_class_machine() && !force_client_mode ) {
1325 // If no other collector is requested explicitly,
1326 // let the VM select the collector based on
1327 // machine class and automatic selection policy.
1328 if (!UseSerialGC &&
1329 !UseConcMarkSweepGC &&
1330 !UseG1GC &&
1331 !UseParNewGC &&
1332 !DumpSharedSpaces &&
1333 FLAG_IS_DEFAULT(UseParallelGC)) {
1334 if (should_auto_select_low_pause_collector()) {
1335 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1336 } else {
1337 FLAG_SET_ERGO(bool, UseParallelGC, true);
1338 }
1339 no_shared_spaces();
1340 }
1341 }
1343 #ifndef ZERO
1344 #ifdef _LP64
1345 // Check that UseCompressedOops can be set with the max heap size allocated
1346 // by ergonomics.
1347 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1348 #if !defined(COMPILER1) || defined(TIERED)
1349 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1350 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1351 }
1352 #endif
1353 #ifdef _WIN64
1354 if (UseLargePages && UseCompressedOops) {
1355 // Cannot allocate guard pages for implicit checks in indexed addressing
1356 // mode, when large pages are specified on windows.
1357 // This flag could be switched ON if narrow oop base address is set to 0,
1358 // see code in Universe::initialize_heap().
1359 Universe::set_narrow_oop_use_implicit_null_checks(false);
1360 }
1361 #endif // _WIN64
1362 } else {
1363 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1364 warning("Max heap size too large for Compressed Oops");
1365 FLAG_SET_DEFAULT(UseCompressedOops, false);
1366 }
1367 }
1368 // Also checks that certain machines are slower with compressed oops
1369 // in vm_version initialization code.
1370 #endif // _LP64
1371 #endif // !ZERO
1372 }
1374 void Arguments::set_parallel_gc_flags() {
1375 assert(UseParallelGC || UseParallelOldGC, "Error");
1376 // If parallel old was requested, automatically enable parallel scavenge.
1377 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1378 FLAG_SET_DEFAULT(UseParallelGC, true);
1379 }
1381 // If no heap maximum was requested explicitly, use some reasonable fraction
1382 // of the physical memory, up to a maximum of 1GB.
1383 if (UseParallelGC) {
1384 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1385 Abstract_VM_Version::parallel_worker_threads());
1387 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1388 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1389 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1390 // See CR 6362902 for details.
1391 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1392 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1393 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1394 }
1395 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1396 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1397 }
1398 }
1400 if (UseParallelOldGC) {
1401 // Par compact uses lower default values since they are treated as
1402 // minimums. These are different defaults because of the different
1403 // interpretation and are not ergonomically set.
1404 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1405 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1406 }
1407 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1408 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1409 }
1410 }
1411 }
1412 }
1414 void Arguments::set_g1_gc_flags() {
1415 assert(UseG1GC, "Error");
1416 #ifdef COMPILER1
1417 FastTLABRefill = false;
1418 #endif
1419 FLAG_SET_DEFAULT(ParallelGCThreads,
1420 Abstract_VM_Version::parallel_worker_threads());
1421 if (ParallelGCThreads == 0) {
1422 FLAG_SET_DEFAULT(ParallelGCThreads,
1423 Abstract_VM_Version::parallel_worker_threads());
1424 }
1425 no_shared_spaces();
1427 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1428 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1429 }
1430 if (PrintGCDetails && Verbose) {
1431 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1432 MarkStackSize / K, MarkStackSizeMax / K);
1433 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1434 }
1436 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1437 // In G1, we want the default GC overhead goal to be higher than
1438 // say in PS. So we set it here to 10%. Otherwise the heap might
1439 // be expanded more aggressively than we would like it to. In
1440 // fact, even 10% seems to not be high enough in some cases
1441 // (especially small GC stress tests that the main thing they do
1442 // is allocation). We might consider increase it further.
1443 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1444 }
1445 }
1447 void Arguments::set_heap_size() {
1448 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1449 // Deprecated flag
1450 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1451 }
1453 const julong phys_mem =
1454 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1455 : (julong)MaxRAM;
1457 // If the maximum heap size has not been set with -Xmx,
1458 // then set it as fraction of the size of physical memory,
1459 // respecting the maximum and minimum sizes of the heap.
1460 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1461 julong reasonable_max = phys_mem / MaxRAMFraction;
1463 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1464 // Small physical memory, so use a minimum fraction of it for the heap
1465 reasonable_max = phys_mem / MinRAMFraction;
1466 } else {
1467 // Not-small physical memory, so require a heap at least
1468 // as large as MaxHeapSize
1469 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1470 }
1471 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1472 // Limit the heap size to ErgoHeapSizeLimit
1473 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1474 }
1475 if (UseCompressedOops) {
1476 // Limit the heap size to the maximum possible when using compressed oops
1477 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1478 }
1479 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1481 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1482 // An initial heap size was specified on the command line,
1483 // so be sure that the maximum size is consistent. Done
1484 // after call to allocatable_physical_memory because that
1485 // method might reduce the allocation size.
1486 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1487 }
1489 if (PrintGCDetails && Verbose) {
1490 // Cannot use gclog_or_tty yet.
1491 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1492 }
1493 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1494 }
1496 // If the initial_heap_size has not been set with InitialHeapSize
1497 // or -Xms, then set it as fraction of the size of physical memory,
1498 // respecting the maximum and minimum sizes of the heap.
1499 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1500 julong reasonable_minimum = (julong)(OldSize + NewSize);
1502 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1504 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1506 julong reasonable_initial = phys_mem / InitialRAMFraction;
1508 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1509 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1511 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1513 if (PrintGCDetails && Verbose) {
1514 // Cannot use gclog_or_tty yet.
1515 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1516 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1517 }
1518 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1519 set_min_heap_size((uintx)reasonable_minimum);
1520 }
1521 }
1523 // This must be called after ergonomics because we want bytecode rewriting
1524 // if the server compiler is used, or if UseSharedSpaces is disabled.
1525 void Arguments::set_bytecode_flags() {
1526 // Better not attempt to store into a read-only space.
1527 if (UseSharedSpaces) {
1528 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1529 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1530 }
1532 if (!RewriteBytecodes) {
1533 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1534 }
1535 }
1537 // Aggressive optimization flags -XX:+AggressiveOpts
1538 void Arguments::set_aggressive_opts_flags() {
1539 #ifdef COMPILER2
1540 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1541 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1542 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1543 }
1544 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1545 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1546 }
1548 // Feed the cache size setting into the JDK
1549 char buffer[1024];
1550 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1551 add_property(buffer);
1552 }
1553 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1554 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1555 }
1556 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1557 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1558 }
1559 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1560 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1561 }
1562 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1563 FLAG_SET_DEFAULT(OptimizeFill, true);
1564 }
1565 #endif
1567 if (AggressiveOpts) {
1568 // Sample flag setting code
1569 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1570 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1571 // }
1572 }
1573 }
1575 //===========================================================================================================
1576 // Parsing of java.compiler property
1578 void Arguments::process_java_compiler_argument(char* arg) {
1579 // For backwards compatibility, Djava.compiler=NONE or ""
1580 // causes us to switch to -Xint mode UNLESS -Xdebug
1581 // is also specified.
1582 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1583 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1584 }
1585 }
1587 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1588 _sun_java_launcher = strdup(launcher);
1589 }
1591 bool Arguments::created_by_java_launcher() {
1592 assert(_sun_java_launcher != NULL, "property must have value");
1593 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1594 }
1596 //===========================================================================================================
1597 // Parsing of main arguments
1599 bool Arguments::verify_interval(uintx val, uintx min,
1600 uintx max, const char* name) {
1601 // Returns true iff value is in the inclusive interval [min..max]
1602 // false, otherwise.
1603 if (val >= min && val <= max) {
1604 return true;
1605 }
1606 jio_fprintf(defaultStream::error_stream(),
1607 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1608 " and " UINTX_FORMAT "\n",
1609 name, val, min, max);
1610 return false;
1611 }
1613 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1614 // Returns true if given value is greater than specified min threshold
1615 // false, otherwise.
1616 if (val >= min ) {
1617 return true;
1618 }
1619 jio_fprintf(defaultStream::error_stream(),
1620 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1621 name, val, min);
1622 return false;
1623 }
1625 bool Arguments::verify_percentage(uintx value, const char* name) {
1626 if (value <= 100) {
1627 return true;
1628 }
1629 jio_fprintf(defaultStream::error_stream(),
1630 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1631 name, value);
1632 return false;
1633 }
1635 static void force_serial_gc() {
1636 FLAG_SET_DEFAULT(UseSerialGC, true);
1637 FLAG_SET_DEFAULT(UseParNewGC, false);
1638 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1639 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1640 FLAG_SET_DEFAULT(UseParallelGC, false);
1641 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1642 FLAG_SET_DEFAULT(UseG1GC, false);
1643 }
1645 static bool verify_serial_gc_flags() {
1646 return (UseSerialGC &&
1647 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1648 UseParallelGC || UseParallelOldGC));
1649 }
1651 // Check consistency of GC selection
1652 bool Arguments::check_gc_consistency() {
1653 bool status = true;
1654 // Ensure that the user has not selected conflicting sets
1655 // of collectors. [Note: this check is merely a user convenience;
1656 // collectors over-ride each other so that only a non-conflicting
1657 // set is selected; however what the user gets is not what they
1658 // may have expected from the combination they asked for. It's
1659 // better to reduce user confusion by not allowing them to
1660 // select conflicting combinations.
1661 uint i = 0;
1662 if (UseSerialGC) i++;
1663 if (UseConcMarkSweepGC || UseParNewGC) i++;
1664 if (UseParallelGC || UseParallelOldGC) i++;
1665 if (UseG1GC) i++;
1666 if (i > 1) {
1667 jio_fprintf(defaultStream::error_stream(),
1668 "Conflicting collector combinations in option list; "
1669 "please refer to the release notes for the combinations "
1670 "allowed\n");
1671 status = false;
1672 }
1674 return status;
1675 }
1677 // Check stack pages settings
1678 bool Arguments::check_stack_pages()
1679 {
1680 bool status = true;
1681 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1682 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1683 status = status && verify_min_value(StackShadowPages, 1, "StackShadowPages");
1684 return status;
1685 }
1687 // Check the consistency of vm_init_args
1688 bool Arguments::check_vm_args_consistency() {
1689 // Method for adding checks for flag consistency.
1690 // The intent is to warn the user of all possible conflicts,
1691 // before returning an error.
1692 // Note: Needs platform-dependent factoring.
1693 bool status = true;
1695 #if ( (defined(COMPILER2) && defined(SPARC)))
1696 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1697 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1698 // x86. Normally, VM_Version_init must be called from init_globals in
1699 // init.cpp, which is called by the initial java thread *after* arguments
1700 // have been parsed. VM_Version_init gets called twice on sparc.
1701 extern void VM_Version_init();
1702 VM_Version_init();
1703 if (!VM_Version::has_v9()) {
1704 jio_fprintf(defaultStream::error_stream(),
1705 "V8 Machine detected, Server requires V9\n");
1706 status = false;
1707 }
1708 #endif /* COMPILER2 && SPARC */
1710 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1711 // builds so the cost of stack banging can be measured.
1712 #if (defined(PRODUCT) && defined(SOLARIS))
1713 if (!UseBoundThreads && !UseStackBanging) {
1714 jio_fprintf(defaultStream::error_stream(),
1715 "-UseStackBanging conflicts with -UseBoundThreads\n");
1717 status = false;
1718 }
1719 #endif
1721 if (TLABRefillWasteFraction == 0) {
1722 jio_fprintf(defaultStream::error_stream(),
1723 "TLABRefillWasteFraction should be a denominator, "
1724 "not " SIZE_FORMAT "\n",
1725 TLABRefillWasteFraction);
1726 status = false;
1727 }
1729 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1730 "AdaptiveSizePolicyWeight");
1731 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1732 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1733 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1734 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1736 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1737 jio_fprintf(defaultStream::error_stream(),
1738 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1739 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1740 MinHeapFreeRatio, MaxHeapFreeRatio);
1741 status = false;
1742 }
1743 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1744 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1746 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1747 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1748 }
1750 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1751 // Settings to encourage splitting.
1752 if (!FLAG_IS_CMDLINE(NewRatio)) {
1753 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1754 }
1755 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1756 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1757 }
1758 }
1760 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1761 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1762 if (GCTimeLimit == 100) {
1763 // Turn off gc-overhead-limit-exceeded checks
1764 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1765 }
1767 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1769 // Check whether user-specified sharing option conflicts with GC or page size.
1770 // Both sharing and large pages are enabled by default on some platforms;
1771 // large pages override sharing only if explicitly set on the command line.
1772 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1773 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1774 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1775 if (cannot_share) {
1776 // Either force sharing on by forcing the other options off, or
1777 // force sharing off.
1778 if (DumpSharedSpaces || ForceSharedSpaces) {
1779 jio_fprintf(defaultStream::error_stream(),
1780 "Using Serial GC and default page size because of %s\n",
1781 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1782 force_serial_gc();
1783 FLAG_SET_DEFAULT(UseLargePages, false);
1784 } else {
1785 if (UseSharedSpaces && Verbose) {
1786 jio_fprintf(defaultStream::error_stream(),
1787 "Turning off use of shared archive because of "
1788 "choice of garbage collector or large pages\n");
1789 }
1790 no_shared_spaces();
1791 }
1792 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1793 FLAG_SET_DEFAULT(UseLargePages, false);
1794 }
1796 status = status && check_gc_consistency();
1797 status = status && check_stack_pages();
1799 if (_has_alloc_profile) {
1800 if (UseParallelGC || UseParallelOldGC) {
1801 jio_fprintf(defaultStream::error_stream(),
1802 "error: invalid argument combination.\n"
1803 "Allocation profiling (-Xaprof) cannot be used together with "
1804 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1805 status = false;
1806 }
1807 if (UseConcMarkSweepGC) {
1808 jio_fprintf(defaultStream::error_stream(),
1809 "error: invalid argument combination.\n"
1810 "Allocation profiling (-Xaprof) cannot be used together with "
1811 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1812 status = false;
1813 }
1814 }
1816 if (CMSIncrementalMode) {
1817 if (!UseConcMarkSweepGC) {
1818 jio_fprintf(defaultStream::error_stream(),
1819 "error: invalid argument combination.\n"
1820 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1821 "selected in order\nto use CMSIncrementalMode.\n");
1822 status = false;
1823 } else {
1824 status = status && verify_percentage(CMSIncrementalDutyCycle,
1825 "CMSIncrementalDutyCycle");
1826 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1827 "CMSIncrementalDutyCycleMin");
1828 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1829 "CMSIncrementalSafetyFactor");
1830 status = status && verify_percentage(CMSIncrementalOffset,
1831 "CMSIncrementalOffset");
1832 status = status && verify_percentage(CMSExpAvgFactor,
1833 "CMSExpAvgFactor");
1834 // If it was not set on the command line, set
1835 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1836 if (CMSInitiatingOccupancyFraction < 0) {
1837 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1838 }
1839 }
1840 }
1842 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1843 // insists that we hold the requisite locks so that the iteration is
1844 // MT-safe. For the verification at start-up and shut-down, we don't
1845 // yet have a good way of acquiring and releasing these locks,
1846 // which are not visible at the CollectedHeap level. We want to
1847 // be able to acquire these locks and then do the iteration rather
1848 // than just disable the lock verification. This will be fixed under
1849 // bug 4788986.
1850 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1851 if (VerifyGCStartAt == 0) {
1852 warning("Heap verification at start-up disabled "
1853 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1854 VerifyGCStartAt = 1; // Disable verification at start-up
1855 }
1856 if (VerifyBeforeExit) {
1857 warning("Heap verification at shutdown disabled "
1858 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1859 VerifyBeforeExit = false; // Disable verification at shutdown
1860 }
1861 }
1863 // Note: only executed in non-PRODUCT mode
1864 if (!UseAsyncConcMarkSweepGC &&
1865 (ExplicitGCInvokesConcurrent ||
1866 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1867 jio_fprintf(defaultStream::error_stream(),
1868 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1869 " with -UseAsyncConcMarkSweepGC");
1870 status = false;
1871 }
1873 if (UseG1GC) {
1874 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1875 "InitiatingHeapOccupancyPercent");
1876 }
1878 status = status && verify_interval(RefDiscoveryPolicy,
1879 ReferenceProcessor::DiscoveryPolicyMin,
1880 ReferenceProcessor::DiscoveryPolicyMax,
1881 "RefDiscoveryPolicy");
1883 // Limit the lower bound of this flag to 1 as it is used in a division
1884 // expression.
1885 status = status && verify_interval(TLABWasteTargetPercent,
1886 1, 100, "TLABWasteTargetPercent");
1888 status = status && verify_object_alignment();
1890 return status;
1891 }
1893 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1894 const char* option_type) {
1895 if (ignore) return false;
1897 const char* spacer = " ";
1898 if (option_type == NULL) {
1899 option_type = ++spacer; // Set both to the empty string.
1900 }
1902 if (os::obsolete_option(option)) {
1903 jio_fprintf(defaultStream::error_stream(),
1904 "Obsolete %s%soption: %s\n", option_type, spacer,
1905 option->optionString);
1906 return false;
1907 } else {
1908 jio_fprintf(defaultStream::error_stream(),
1909 "Unrecognized %s%soption: %s\n", option_type, spacer,
1910 option->optionString);
1911 return true;
1912 }
1913 }
1915 static const char* user_assertion_options[] = {
1916 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1917 };
1919 static const char* system_assertion_options[] = {
1920 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1921 };
1923 // Return true if any of the strings in null-terminated array 'names' matches.
1924 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1925 // the option must match exactly.
1926 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1927 bool tail_allowed) {
1928 for (/* empty */; *names != NULL; ++names) {
1929 if (match_option(option, *names, tail)) {
1930 if (**tail == '\0' || tail_allowed && **tail == ':') {
1931 return true;
1932 }
1933 }
1934 }
1935 return false;
1936 }
1938 bool Arguments::parse_uintx(const char* value,
1939 uintx* uintx_arg,
1940 uintx min_size) {
1942 // Check the sign first since atomull() parses only unsigned values.
1943 bool value_is_positive = !(*value == '-');
1945 if (value_is_positive) {
1946 julong n;
1947 bool good_return = atomull(value, &n);
1948 if (good_return) {
1949 bool above_minimum = n >= min_size;
1950 bool value_is_too_large = n > max_uintx;
1952 if (above_minimum && !value_is_too_large) {
1953 *uintx_arg = n;
1954 return true;
1955 }
1956 }
1957 }
1958 return false;
1959 }
1961 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1962 julong* long_arg,
1963 julong min_size) {
1964 if (!atomull(s, long_arg)) return arg_unreadable;
1965 return check_memory_size(*long_arg, min_size);
1966 }
1968 // Parse JavaVMInitArgs structure
1970 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1971 // For components of the system classpath.
1972 SysClassPath scp(Arguments::get_sysclasspath());
1973 bool scp_assembly_required = false;
1975 // Save default settings for some mode flags
1976 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1977 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1978 Arguments::_ClipInlining = ClipInlining;
1979 Arguments::_BackgroundCompilation = BackgroundCompilation;
1981 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1982 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1983 if (result != JNI_OK) {
1984 return result;
1985 }
1987 // Parse JavaVMInitArgs structure passed in
1988 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1989 if (result != JNI_OK) {
1990 return result;
1991 }
1993 if (AggressiveOpts) {
1994 // Insert alt-rt.jar between user-specified bootclasspath
1995 // prefix and the default bootclasspath. os::set_boot_path()
1996 // uses meta_index_dir as the default bootclasspath directory.
1997 const char* altclasses_jar = "alt-rt.jar";
1998 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1999 strlen(altclasses_jar);
2000 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2001 strcpy(altclasses_path, get_meta_index_dir());
2002 strcat(altclasses_path, altclasses_jar);
2003 scp.add_suffix_to_prefix(altclasses_path);
2004 scp_assembly_required = true;
2005 FREE_C_HEAP_ARRAY(char, altclasses_path);
2006 }
2008 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2009 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2010 if (result != JNI_OK) {
2011 return result;
2012 }
2014 // Do final processing now that all arguments have been parsed
2015 result = finalize_vm_init_args(&scp, scp_assembly_required);
2016 if (result != JNI_OK) {
2017 return result;
2018 }
2020 return JNI_OK;
2021 }
2023 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2024 SysClassPath* scp_p,
2025 bool* scp_assembly_required_p,
2026 FlagValueOrigin origin) {
2027 // Remaining part of option string
2028 const char* tail;
2030 // iterate over arguments
2031 for (int index = 0; index < args->nOptions; index++) {
2032 bool is_absolute_path = false; // for -agentpath vs -agentlib
2034 const JavaVMOption* option = args->options + index;
2036 if (!match_option(option, "-Djava.class.path", &tail) &&
2037 !match_option(option, "-Dsun.java.command", &tail) &&
2038 !match_option(option, "-Dsun.java.launcher", &tail)) {
2040 // add all jvm options to the jvm_args string. This string
2041 // is used later to set the java.vm.args PerfData string constant.
2042 // the -Djava.class.path and the -Dsun.java.command options are
2043 // omitted from jvm_args string as each have their own PerfData
2044 // string constant object.
2045 build_jvm_args(option->optionString);
2046 }
2048 // -verbose:[class/gc/jni]
2049 if (match_option(option, "-verbose", &tail)) {
2050 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2051 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2052 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2053 } else if (!strcmp(tail, ":gc")) {
2054 FLAG_SET_CMDLINE(bool, PrintGC, true);
2055 } else if (!strcmp(tail, ":jni")) {
2056 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2057 }
2058 // -da / -ea / -disableassertions / -enableassertions
2059 // These accept an optional class/package name separated by a colon, e.g.,
2060 // -da:java.lang.Thread.
2061 } else if (match_option(option, user_assertion_options, &tail, true)) {
2062 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2063 if (*tail == '\0') {
2064 JavaAssertions::setUserClassDefault(enable);
2065 } else {
2066 assert(*tail == ':', "bogus match by match_option()");
2067 JavaAssertions::addOption(tail + 1, enable);
2068 }
2069 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2070 } else if (match_option(option, system_assertion_options, &tail, false)) {
2071 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2072 JavaAssertions::setSystemClassDefault(enable);
2073 // -bootclasspath:
2074 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2075 scp_p->reset_path(tail);
2076 *scp_assembly_required_p = true;
2077 // -bootclasspath/a:
2078 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2079 scp_p->add_suffix(tail);
2080 *scp_assembly_required_p = true;
2081 // -bootclasspath/p:
2082 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2083 scp_p->add_prefix(tail);
2084 *scp_assembly_required_p = true;
2085 // -Xrun
2086 } else if (match_option(option, "-Xrun", &tail)) {
2087 if (tail != NULL) {
2088 const char* pos = strchr(tail, ':');
2089 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2090 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2091 name[len] = '\0';
2093 char *options = NULL;
2094 if(pos != NULL) {
2095 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2096 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2097 }
2098 #ifdef JVMTI_KERNEL
2099 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2100 warning("profiling and debugging agents are not supported with Kernel VM");
2101 } else
2102 #endif // JVMTI_KERNEL
2103 add_init_library(name, options);
2104 }
2105 // -agentlib and -agentpath
2106 } else if (match_option(option, "-agentlib:", &tail) ||
2107 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2108 if(tail != NULL) {
2109 const char* pos = strchr(tail, '=');
2110 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2111 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2112 name[len] = '\0';
2114 char *options = NULL;
2115 if(pos != NULL) {
2116 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2117 }
2118 #ifdef JVMTI_KERNEL
2119 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2120 warning("profiling and debugging agents are not supported with Kernel VM");
2121 } else
2122 #endif // JVMTI_KERNEL
2123 add_init_agent(name, options, is_absolute_path);
2125 }
2126 // -javaagent
2127 } else if (match_option(option, "-javaagent:", &tail)) {
2128 if(tail != NULL) {
2129 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2130 add_init_agent("instrument", options, false);
2131 }
2132 // -Xnoclassgc
2133 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2134 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2135 // -Xincgc: i-CMS
2136 } else if (match_option(option, "-Xincgc", &tail)) {
2137 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2138 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2139 // -Xnoincgc: no i-CMS
2140 } else if (match_option(option, "-Xnoincgc", &tail)) {
2141 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2142 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2143 // -Xconcgc
2144 } else if (match_option(option, "-Xconcgc", &tail)) {
2145 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2146 // -Xnoconcgc
2147 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2148 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2149 // -Xbatch
2150 } else if (match_option(option, "-Xbatch", &tail)) {
2151 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2152 // -Xmn for compatibility with other JVM vendors
2153 } else if (match_option(option, "-Xmn", &tail)) {
2154 julong long_initial_eden_size = 0;
2155 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2156 if (errcode != arg_in_range) {
2157 jio_fprintf(defaultStream::error_stream(),
2158 "Invalid initial eden size: %s\n", option->optionString);
2159 describe_range_error(errcode);
2160 return JNI_EINVAL;
2161 }
2162 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2163 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2164 // -Xms
2165 } else if (match_option(option, "-Xms", &tail)) {
2166 julong long_initial_heap_size = 0;
2167 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2168 if (errcode != arg_in_range) {
2169 jio_fprintf(defaultStream::error_stream(),
2170 "Invalid initial heap size: %s\n", option->optionString);
2171 describe_range_error(errcode);
2172 return JNI_EINVAL;
2173 }
2174 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2175 // Currently the minimum size and the initial heap sizes are the same.
2176 set_min_heap_size(InitialHeapSize);
2177 // -Xmx
2178 } else if (match_option(option, "-Xmx", &tail)) {
2179 julong long_max_heap_size = 0;
2180 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2181 if (errcode != arg_in_range) {
2182 jio_fprintf(defaultStream::error_stream(),
2183 "Invalid maximum heap size: %s\n", option->optionString);
2184 describe_range_error(errcode);
2185 return JNI_EINVAL;
2186 }
2187 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2188 // Xmaxf
2189 } else if (match_option(option, "-Xmaxf", &tail)) {
2190 int maxf = (int)(atof(tail) * 100);
2191 if (maxf < 0 || maxf > 100) {
2192 jio_fprintf(defaultStream::error_stream(),
2193 "Bad max heap free percentage size: %s\n",
2194 option->optionString);
2195 return JNI_EINVAL;
2196 } else {
2197 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2198 }
2199 // Xminf
2200 } else if (match_option(option, "-Xminf", &tail)) {
2201 int minf = (int)(atof(tail) * 100);
2202 if (minf < 0 || minf > 100) {
2203 jio_fprintf(defaultStream::error_stream(),
2204 "Bad min heap free percentage size: %s\n",
2205 option->optionString);
2206 return JNI_EINVAL;
2207 } else {
2208 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2209 }
2210 // -Xss
2211 } else if (match_option(option, "-Xss", &tail)) {
2212 julong long_ThreadStackSize = 0;
2213 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2214 if (errcode != arg_in_range) {
2215 jio_fprintf(defaultStream::error_stream(),
2216 "Invalid thread stack size: %s\n", option->optionString);
2217 describe_range_error(errcode);
2218 return JNI_EINVAL;
2219 }
2220 // Internally track ThreadStackSize in units of 1024 bytes.
2221 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2222 round_to((int)long_ThreadStackSize, K) / K);
2223 // -Xoss
2224 } else if (match_option(option, "-Xoss", &tail)) {
2225 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2226 // -Xmaxjitcodesize
2227 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2228 julong long_ReservedCodeCacheSize = 0;
2229 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2230 (size_t)InitialCodeCacheSize);
2231 if (errcode != arg_in_range) {
2232 jio_fprintf(defaultStream::error_stream(),
2233 "Invalid maximum code cache size: %s\n",
2234 option->optionString);
2235 describe_range_error(errcode);
2236 return JNI_EINVAL;
2237 }
2238 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2239 // -green
2240 } else if (match_option(option, "-green", &tail)) {
2241 jio_fprintf(defaultStream::error_stream(),
2242 "Green threads support not available\n");
2243 return JNI_EINVAL;
2244 // -native
2245 } else if (match_option(option, "-native", &tail)) {
2246 // HotSpot always uses native threads, ignore silently for compatibility
2247 // -Xsqnopause
2248 } else if (match_option(option, "-Xsqnopause", &tail)) {
2249 // EVM option, ignore silently for compatibility
2250 // -Xrs
2251 } else if (match_option(option, "-Xrs", &tail)) {
2252 // Classic/EVM option, new functionality
2253 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2254 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2255 // change default internal VM signals used - lower case for back compat
2256 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2257 // -Xoptimize
2258 } else if (match_option(option, "-Xoptimize", &tail)) {
2259 // EVM option, ignore silently for compatibility
2260 // -Xprof
2261 } else if (match_option(option, "-Xprof", &tail)) {
2262 #ifndef FPROF_KERNEL
2263 _has_profile = true;
2264 #else // FPROF_KERNEL
2265 // do we have to exit?
2266 warning("Kernel VM does not support flat profiling.");
2267 #endif // FPROF_KERNEL
2268 // -Xaprof
2269 } else if (match_option(option, "-Xaprof", &tail)) {
2270 _has_alloc_profile = true;
2271 // -Xconcurrentio
2272 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2273 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2274 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2275 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2276 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2277 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2279 // -Xinternalversion
2280 } else if (match_option(option, "-Xinternalversion", &tail)) {
2281 jio_fprintf(defaultStream::output_stream(), "%s\n",
2282 VM_Version::internal_vm_info_string());
2283 vm_exit(0);
2284 #ifndef PRODUCT
2285 // -Xprintflags
2286 } else if (match_option(option, "-Xprintflags", &tail)) {
2287 CommandLineFlags::printFlags();
2288 vm_exit(0);
2289 #endif
2290 // -D
2291 } else if (match_option(option, "-D", &tail)) {
2292 if (!add_property(tail)) {
2293 return JNI_ENOMEM;
2294 }
2295 // Out of the box management support
2296 if (match_option(option, "-Dcom.sun.management", &tail)) {
2297 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2298 }
2299 // -Xint
2300 } else if (match_option(option, "-Xint", &tail)) {
2301 set_mode_flags(_int);
2302 // -Xmixed
2303 } else if (match_option(option, "-Xmixed", &tail)) {
2304 set_mode_flags(_mixed);
2305 // -Xcomp
2306 } else if (match_option(option, "-Xcomp", &tail)) {
2307 // for testing the compiler; turn off all flags that inhibit compilation
2308 set_mode_flags(_comp);
2310 // -Xshare:dump
2311 } else if (match_option(option, "-Xshare:dump", &tail)) {
2312 #ifdef TIERED
2313 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2314 set_mode_flags(_int); // Prevent compilation, which creates objects
2315 #elif defined(COMPILER2)
2316 vm_exit_during_initialization(
2317 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2318 #elif defined(KERNEL)
2319 vm_exit_during_initialization(
2320 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2321 #else
2322 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2323 set_mode_flags(_int); // Prevent compilation, which creates objects
2324 #endif
2325 // -Xshare:on
2326 } else if (match_option(option, "-Xshare:on", &tail)) {
2327 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2328 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2329 #ifdef TIERED
2330 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2331 #endif // TIERED
2332 // -Xshare:auto
2333 } else if (match_option(option, "-Xshare:auto", &tail)) {
2334 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2335 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2336 // -Xshare:off
2337 } else if (match_option(option, "-Xshare:off", &tail)) {
2338 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2339 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2341 // -Xverify
2342 } else if (match_option(option, "-Xverify", &tail)) {
2343 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2344 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2345 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2346 } else if (strcmp(tail, ":remote") == 0) {
2347 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2348 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2349 } else if (strcmp(tail, ":none") == 0) {
2350 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2351 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2352 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2353 return JNI_EINVAL;
2354 }
2355 // -Xdebug
2356 } else if (match_option(option, "-Xdebug", &tail)) {
2357 // note this flag has been used, then ignore
2358 set_xdebug_mode(true);
2359 // -Xnoagent
2360 } else if (match_option(option, "-Xnoagent", &tail)) {
2361 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2362 } else if (match_option(option, "-Xboundthreads", &tail)) {
2363 // Bind user level threads to kernel threads (Solaris only)
2364 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2365 } else if (match_option(option, "-Xloggc:", &tail)) {
2366 // Redirect GC output to the file. -Xloggc:<filename>
2367 // ostream_init_log(), when called will use this filename
2368 // to initialize a fileStream.
2369 _gc_log_filename = strdup(tail);
2370 FLAG_SET_CMDLINE(bool, PrintGC, true);
2371 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2372 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2374 // JNI hooks
2375 } else if (match_option(option, "-Xcheck", &tail)) {
2376 if (!strcmp(tail, ":jni")) {
2377 CheckJNICalls = true;
2378 } else if (is_bad_option(option, args->ignoreUnrecognized,
2379 "check")) {
2380 return JNI_EINVAL;
2381 }
2382 } else if (match_option(option, "vfprintf", &tail)) {
2383 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2384 } else if (match_option(option, "exit", &tail)) {
2385 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2386 } else if (match_option(option, "abort", &tail)) {
2387 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2388 // -XX:+AggressiveHeap
2389 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2391 // This option inspects the machine and attempts to set various
2392 // parameters to be optimal for long-running, memory allocation
2393 // intensive jobs. It is intended for machines with large
2394 // amounts of cpu and memory.
2396 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2397 // VM, but we may not be able to represent the total physical memory
2398 // available (like having 8gb of memory on a box but using a 32bit VM).
2399 // Thus, we need to make sure we're using a julong for intermediate
2400 // calculations.
2401 julong initHeapSize;
2402 julong total_memory = os::physical_memory();
2404 if (total_memory < (julong)256*M) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2407 vm_exit(1);
2408 }
2410 // The heap size is half of available memory, or (at most)
2411 // all of possible memory less 160mb (leaving room for the OS
2412 // when using ISM). This is the maximum; because adaptive sizing
2413 // is turned on below, the actual space used may be smaller.
2415 initHeapSize = MIN2(total_memory / (julong)2,
2416 total_memory - (julong)160*M);
2418 // Make sure that if we have a lot of memory we cap the 32 bit
2419 // process space. The 64bit VM version of this function is a nop.
2420 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2422 // The perm gen is separate but contiguous with the
2423 // object heap (and is reserved with it) so subtract it
2424 // from the heap size.
2425 if (initHeapSize > MaxPermSize) {
2426 initHeapSize = initHeapSize - MaxPermSize;
2427 } else {
2428 warning("AggressiveHeap and MaxPermSize values may conflict");
2429 }
2431 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2432 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2433 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2434 // Currently the minimum size and the initial heap sizes are the same.
2435 set_min_heap_size(initHeapSize);
2436 }
2437 if (FLAG_IS_DEFAULT(NewSize)) {
2438 // Make the young generation 3/8ths of the total heap.
2439 FLAG_SET_CMDLINE(uintx, NewSize,
2440 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2441 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2442 }
2444 FLAG_SET_DEFAULT(UseLargePages, true);
2446 // Increase some data structure sizes for efficiency
2447 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2448 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2449 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2451 // See the OldPLABSize comment below, but replace 'after promotion'
2452 // with 'after copying'. YoungPLABSize is the size of the survivor
2453 // space per-gc-thread buffers. The default is 4kw.
2454 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2456 // OldPLABSize is the size of the buffers in the old gen that
2457 // UseParallelGC uses to promote live data that doesn't fit in the
2458 // survivor spaces. At any given time, there's one for each gc thread.
2459 // The default size is 1kw. These buffers are rarely used, since the
2460 // survivor spaces are usually big enough. For specjbb, however, there
2461 // are occasions when there's lots of live data in the young gen
2462 // and we end up promoting some of it. We don't have a definite
2463 // explanation for why bumping OldPLABSize helps, but the theory
2464 // is that a bigger PLAB results in retaining something like the
2465 // original allocation order after promotion, which improves mutator
2466 // locality. A minor effect may be that larger PLABs reduce the
2467 // number of PLAB allocation events during gc. The value of 8kw
2468 // was arrived at by experimenting with specjbb.
2469 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2471 // CompilationPolicyChoice=0 causes the server compiler to adopt
2472 // a more conservative which-method-do-I-compile policy when one
2473 // of the counters maintained by the interpreter trips. The
2474 // result is reduced startup time and improved specjbb and
2475 // alacrity performance. Zero is the default, but we set it
2476 // explicitly here in case the default changes.
2477 // See runtime/compilationPolicy.*.
2478 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2480 // Enable parallel GC and adaptive generation sizing
2481 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2482 FLAG_SET_DEFAULT(ParallelGCThreads,
2483 Abstract_VM_Version::parallel_worker_threads());
2485 // Encourage steady state memory management
2486 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2488 // This appears to improve mutator locality
2489 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2491 // Get around early Solaris scheduling bug
2492 // (affinity vs other jobs on system)
2493 // but disallow DR and offlining (5008695).
2494 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2496 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2497 // The last option must always win.
2498 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2499 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2500 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2501 // The last option must always win.
2502 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2503 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2504 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2505 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Please use CMSClassUnloadingEnabled in place of "
2508 "CMSPermGenSweepingEnabled in the future\n");
2509 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2510 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Please use -XX:+UseGCOverheadLimit in place of "
2513 "-XX:+UseGCTimeLimit in the future\n");
2514 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2515 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2516 jio_fprintf(defaultStream::error_stream(),
2517 "Please use -XX:-UseGCOverheadLimit in place of "
2518 "-XX:-UseGCTimeLimit in the future\n");
2519 // The TLE options are for compatibility with 1.3 and will be
2520 // removed without notice in a future release. These options
2521 // are not to be documented.
2522 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2523 // No longer used.
2524 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2525 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2526 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2527 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2528 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2529 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2530 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2531 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2532 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2533 // No longer used.
2534 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2535 julong long_tlab_size = 0;
2536 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2537 if (errcode != arg_in_range) {
2538 jio_fprintf(defaultStream::error_stream(),
2539 "Invalid TLAB size: %s\n", option->optionString);
2540 describe_range_error(errcode);
2541 return JNI_EINVAL;
2542 }
2543 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2544 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2545 // No longer used.
2546 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2547 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2548 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2549 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2550 SOLARIS_ONLY(
2551 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2552 warning("-XX:+UsePermISM is obsolete.");
2553 FLAG_SET_CMDLINE(bool, UseISM, true);
2554 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2555 FLAG_SET_CMDLINE(bool, UseISM, false);
2556 )
2557 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2558 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2559 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2560 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2561 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2562 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2563 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2564 #ifdef SOLARIS
2565 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2566 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2567 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2568 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2569 #else // ndef SOLARIS
2570 jio_fprintf(defaultStream::error_stream(),
2571 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2572 return JNI_EINVAL;
2573 #endif // ndef SOLARIS
2574 #ifdef ASSERT
2575 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2576 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2577 // disable scavenge before parallel mark-compact
2578 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2579 #endif
2580 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2581 julong cms_blocks_to_claim = (julong)atol(tail);
2582 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2583 jio_fprintf(defaultStream::error_stream(),
2584 "Please use -XX:OldPLABSize in place of "
2585 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2586 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2587 julong cms_blocks_to_claim = (julong)atol(tail);
2588 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Please use -XX:OldPLABSize in place of "
2591 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2592 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2593 julong old_plab_size = 0;
2594 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2595 if (errcode != arg_in_range) {
2596 jio_fprintf(defaultStream::error_stream(),
2597 "Invalid old PLAB size: %s\n", option->optionString);
2598 describe_range_error(errcode);
2599 return JNI_EINVAL;
2600 }
2601 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2602 jio_fprintf(defaultStream::error_stream(),
2603 "Please use -XX:OldPLABSize in place of "
2604 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2605 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2606 julong young_plab_size = 0;
2607 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2608 if (errcode != arg_in_range) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid young PLAB size: %s\n", option->optionString);
2611 describe_range_error(errcode);
2612 return JNI_EINVAL;
2613 }
2614 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Please use -XX:YoungPLABSize in place of "
2617 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2618 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2619 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2620 julong stack_size = 0;
2621 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2622 if (errcode != arg_in_range) {
2623 jio_fprintf(defaultStream::error_stream(),
2624 "Invalid mark stack size: %s\n", option->optionString);
2625 describe_range_error(errcode);
2626 return JNI_EINVAL;
2627 }
2628 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2629 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2630 julong max_stack_size = 0;
2631 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2632 if (errcode != arg_in_range) {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Invalid maximum mark stack size: %s\n",
2635 option->optionString);
2636 describe_range_error(errcode);
2637 return JNI_EINVAL;
2638 }
2639 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2640 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2641 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2642 uintx conc_threads = 0;
2643 if (!parse_uintx(tail, &conc_threads, 1)) {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Invalid concurrent threads: %s\n", option->optionString);
2646 return JNI_EINVAL;
2647 }
2648 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2649 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2650 // Skip -XX:Flags= since that case has already been handled
2651 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2652 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2653 return JNI_EINVAL;
2654 }
2655 }
2656 // Unknown option
2657 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2658 return JNI_ERR;
2659 }
2660 }
2661 // Change the default value for flags which have different default values
2662 // when working with older JDKs.
2663 if (JDK_Version::current().compare_major(6) <= 0 &&
2664 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2665 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2666 }
2667 #ifdef LINUX
2668 if (JDK_Version::current().compare_major(6) <= 0 &&
2669 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2670 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2671 }
2672 #endif // LINUX
2673 return JNI_OK;
2674 }
2676 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2677 // This must be done after all -D arguments have been processed.
2678 scp_p->expand_endorsed();
2680 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2681 // Assemble the bootclasspath elements into the final path.
2682 Arguments::set_sysclasspath(scp_p->combined_path());
2683 }
2685 // This must be done after all arguments have been processed.
2686 // java_compiler() true means set to "NONE" or empty.
2687 if (java_compiler() && !xdebug_mode()) {
2688 // For backwards compatibility, we switch to interpreted mode if
2689 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2690 // not specified.
2691 set_mode_flags(_int);
2692 }
2693 if (CompileThreshold == 0) {
2694 set_mode_flags(_int);
2695 }
2697 #ifndef COMPILER2
2698 // Don't degrade server performance for footprint
2699 if (FLAG_IS_DEFAULT(UseLargePages) &&
2700 MaxHeapSize < LargePageHeapSizeThreshold) {
2701 // No need for large granularity pages w/small heaps.
2702 // Note that large pages are enabled/disabled for both the
2703 // Java heap and the code cache.
2704 FLAG_SET_DEFAULT(UseLargePages, false);
2705 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2706 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2707 }
2709 // Tiered compilation is undefined with C1.
2710 TieredCompilation = false;
2711 #else
2712 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2713 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2714 }
2715 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2716 if (UseG1GC) {
2717 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2718 }
2719 #endif
2721 // If we are running in a headless jre, force java.awt.headless property
2722 // to be true unless the property has already been set.
2723 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2724 if (os::is_headless_jre()) {
2725 const char* headless = Arguments::get_property("java.awt.headless");
2726 if (headless == NULL) {
2727 char envbuffer[128];
2728 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2729 if (!add_property("java.awt.headless=true")) {
2730 return JNI_ENOMEM;
2731 }
2732 } else {
2733 char buffer[256];
2734 strcpy(buffer, "java.awt.headless=");
2735 strcat(buffer, envbuffer);
2736 if (!add_property(buffer)) {
2737 return JNI_ENOMEM;
2738 }
2739 }
2740 }
2741 }
2743 if (!check_vm_args_consistency()) {
2744 return JNI_ERR;
2745 }
2747 return JNI_OK;
2748 }
2750 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2751 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2752 scp_assembly_required_p);
2753 }
2755 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2756 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2757 scp_assembly_required_p);
2758 }
2760 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2761 const int N_MAX_OPTIONS = 64;
2762 const int OPTION_BUFFER_SIZE = 1024;
2763 char buffer[OPTION_BUFFER_SIZE];
2765 // The variable will be ignored if it exceeds the length of the buffer.
2766 // Don't check this variable if user has special privileges
2767 // (e.g. unix su command).
2768 if (os::getenv(name, buffer, sizeof(buffer)) &&
2769 !os::have_special_privileges()) {
2770 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Picked up %s: %s\n", name, buffer);
2773 char* rd = buffer; // pointer to the input string (rd)
2774 int i;
2775 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2776 while (isspace(*rd)) rd++; // skip whitespace
2777 if (*rd == 0) break; // we re done when the input string is read completely
2779 // The output, option string, overwrites the input string.
2780 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2781 // input string (rd).
2782 char* wrt = rd;
2784 options[i++].optionString = wrt; // Fill in option
2785 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2786 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2787 int quote = *rd; // matching quote to look for
2788 rd++; // don't copy open quote
2789 while (*rd != quote) { // include everything (even spaces) up until quote
2790 if (*rd == 0) { // string termination means unmatched string
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Unmatched quote in %s\n", name);
2793 return JNI_ERR;
2794 }
2795 *wrt++ = *rd++; // copy to option string
2796 }
2797 rd++; // don't copy close quote
2798 } else {
2799 *wrt++ = *rd++; // copy to option string
2800 }
2801 }
2802 // Need to check if we're done before writing a NULL,
2803 // because the write could be to the byte that rd is pointing to.
2804 if (*rd++ == 0) {
2805 *wrt = 0;
2806 break;
2807 }
2808 *wrt = 0; // Zero terminate option
2809 }
2810 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2811 JavaVMInitArgs vm_args;
2812 vm_args.version = JNI_VERSION_1_2;
2813 vm_args.options = options;
2814 vm_args.nOptions = i;
2815 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2817 if (PrintVMOptions) {
2818 const char* tail;
2819 for (int i = 0; i < vm_args.nOptions; i++) {
2820 const JavaVMOption *option = vm_args.options + i;
2821 if (match_option(option, "-XX:", &tail)) {
2822 logOption(tail);
2823 }
2824 }
2825 }
2827 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2828 }
2829 return JNI_OK;
2830 }
2832 // Parse entry point called from JNI_CreateJavaVM
2834 jint Arguments::parse(const JavaVMInitArgs* args) {
2836 // Sharing support
2837 // Construct the path to the archive
2838 char jvm_path[JVM_MAXPATHLEN];
2839 os::jvm_path(jvm_path, sizeof(jvm_path));
2840 #ifdef TIERED
2841 if (strstr(jvm_path, "client") != NULL) {
2842 force_client_mode = true;
2843 }
2844 #endif // TIERED
2845 char *end = strrchr(jvm_path, *os::file_separator());
2846 if (end != NULL) *end = '\0';
2847 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2848 strlen(os::file_separator()) + 20);
2849 if (shared_archive_path == NULL) return JNI_ENOMEM;
2850 strcpy(shared_archive_path, jvm_path);
2851 strcat(shared_archive_path, os::file_separator());
2852 strcat(shared_archive_path, "classes");
2853 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2854 strcat(shared_archive_path, ".jsa");
2855 SharedArchivePath = shared_archive_path;
2857 // Remaining part of option string
2858 const char* tail;
2860 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2861 bool settings_file_specified = false;
2862 const char* flags_file;
2863 int index;
2864 for (index = 0; index < args->nOptions; index++) {
2865 const JavaVMOption *option = args->options + index;
2866 if (match_option(option, "-XX:Flags=", &tail)) {
2867 flags_file = tail;
2868 settings_file_specified = true;
2869 }
2870 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2871 PrintVMOptions = true;
2872 }
2873 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2874 PrintVMOptions = false;
2875 }
2876 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2877 IgnoreUnrecognizedVMOptions = true;
2878 }
2879 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2880 IgnoreUnrecognizedVMOptions = false;
2881 }
2882 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2883 CommandLineFlags::printFlags();
2884 vm_exit(0);
2885 }
2887 #ifndef PRODUCT
2888 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2889 CommandLineFlags::printFlags(true);
2890 vm_exit(0);
2891 }
2892 #endif
2893 }
2895 if (IgnoreUnrecognizedVMOptions) {
2896 // uncast const to modify the flag args->ignoreUnrecognized
2897 *(jboolean*)(&args->ignoreUnrecognized) = true;
2898 }
2900 // Parse specified settings file
2901 if (settings_file_specified) {
2902 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2903 return JNI_EINVAL;
2904 }
2905 }
2907 // Parse default .hotspotrc settings file
2908 if (!settings_file_specified) {
2909 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2910 return JNI_EINVAL;
2911 }
2912 }
2914 if (PrintVMOptions) {
2915 for (index = 0; index < args->nOptions; index++) {
2916 const JavaVMOption *option = args->options + index;
2917 if (match_option(option, "-XX:", &tail)) {
2918 logOption(tail);
2919 }
2920 }
2921 }
2923 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2924 jint result = parse_vm_init_args(args);
2925 if (result != JNI_OK) {
2926 return result;
2927 }
2929 #ifndef PRODUCT
2930 if (TraceBytecodesAt != 0) {
2931 TraceBytecodes = true;
2932 }
2933 if (CountCompiledCalls) {
2934 if (UseCounterDecay) {
2935 warning("UseCounterDecay disabled because CountCalls is set");
2936 UseCounterDecay = false;
2937 }
2938 }
2939 #endif // PRODUCT
2941 if (EnableInvokeDynamic && !EnableMethodHandles) {
2942 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2943 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2944 }
2945 EnableMethodHandles = true;
2946 }
2947 if (EnableMethodHandles && !AnonymousClasses) {
2948 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2949 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2950 }
2951 AnonymousClasses = true;
2952 }
2953 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2954 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2955 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2956 }
2957 ScavengeRootsInCode = 1;
2958 }
2959 #ifdef COMPILER2
2960 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2961 // TODO: We need to find rules for invokedynamic and EA. For now,
2962 // simply disable EA by default.
2963 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2964 DoEscapeAnalysis = false;
2965 }
2966 }
2967 #endif
2969 if (PrintGCDetails) {
2970 // Turn on -verbose:gc options as well
2971 PrintGC = true;
2972 }
2974 #if defined(_LP64) && defined(COMPILER1) && !defined(TIERED)
2975 UseCompressedOops = false;
2976 #endif
2978 // Set object alignment values.
2979 set_object_alignment();
2981 #ifdef SERIALGC
2982 force_serial_gc();
2983 #endif // SERIALGC
2984 #ifdef KERNEL
2985 no_shared_spaces();
2986 #endif // KERNEL
2988 // Set flags based on ergonomics.
2989 set_ergonomics_flags();
2991 #ifdef _LP64
2992 // XXX JSR 292 currently does not support compressed oops.
2993 if (EnableMethodHandles && UseCompressedOops) {
2994 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2995 UseCompressedOops = false;
2996 }
2997 }
2998 #endif // _LP64
3000 // Check the GC selections again.
3001 if (!check_gc_consistency()) {
3002 return JNI_EINVAL;
3003 }
3005 if (TieredCompilation) {
3006 set_tiered_flags();
3007 } else {
3008 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3009 if (CompilationPolicyChoice >= 2) {
3010 vm_exit_during_initialization(
3011 "Incompatible compilation policy selected", NULL);
3012 }
3013 }
3015 #ifndef KERNEL
3016 if (UseConcMarkSweepGC) {
3017 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3018 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3019 // are true, we don't call set_parnew_gc_flags() as well.
3020 set_cms_and_parnew_gc_flags();
3021 } else {
3022 // Set heap size based on available physical memory
3023 set_heap_size();
3024 // Set per-collector flags
3025 if (UseParallelGC || UseParallelOldGC) {
3026 set_parallel_gc_flags();
3027 } else if (UseParNewGC) {
3028 set_parnew_gc_flags();
3029 } else if (UseG1GC) {
3030 set_g1_gc_flags();
3031 }
3032 }
3033 #endif // KERNEL
3035 #ifdef SERIALGC
3036 assert(verify_serial_gc_flags(), "SerialGC unset");
3037 #endif // SERIALGC
3039 // Set bytecode rewriting flags
3040 set_bytecode_flags();
3042 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3043 set_aggressive_opts_flags();
3045 #ifdef CC_INTERP
3046 // Clear flags not supported by the C++ interpreter
3047 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3048 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3049 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3050 #endif // CC_INTERP
3052 #ifdef COMPILER2
3053 if (!UseBiasedLocking || EmitSync != 0) {
3054 UseOptoBiasInlining = false;
3055 }
3056 #endif
3058 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3059 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3060 DebugNonSafepoints = true;
3061 }
3063 #ifndef PRODUCT
3064 if (CompileTheWorld) {
3065 // Force NmethodSweeper to sweep whole CodeCache each time.
3066 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3067 NmethodSweepFraction = 1;
3068 }
3069 }
3070 #endif
3072 if (PrintCommandLineFlags) {
3073 CommandLineFlags::printSetFlags();
3074 }
3076 // Apply CPU specific policy for the BiasedLocking
3077 if (UseBiasedLocking) {
3078 if (!VM_Version::use_biased_locking() &&
3079 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3080 UseBiasedLocking = false;
3081 }
3082 }
3084 return JNI_OK;
3085 }
3087 int Arguments::PropertyList_count(SystemProperty* pl) {
3088 int count = 0;
3089 while(pl != NULL) {
3090 count++;
3091 pl = pl->next();
3092 }
3093 return count;
3094 }
3096 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3097 assert(key != NULL, "just checking");
3098 SystemProperty* prop;
3099 for (prop = pl; prop != NULL; prop = prop->next()) {
3100 if (strcmp(key, prop->key()) == 0) return prop->value();
3101 }
3102 return NULL;
3103 }
3105 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3106 int count = 0;
3107 const char* ret_val = NULL;
3109 while(pl != NULL) {
3110 if(count >= index) {
3111 ret_val = pl->key();
3112 break;
3113 }
3114 count++;
3115 pl = pl->next();
3116 }
3118 return ret_val;
3119 }
3121 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3122 int count = 0;
3123 char* ret_val = NULL;
3125 while(pl != NULL) {
3126 if(count >= index) {
3127 ret_val = pl->value();
3128 break;
3129 }
3130 count++;
3131 pl = pl->next();
3132 }
3134 return ret_val;
3135 }
3137 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3138 SystemProperty* p = *plist;
3139 if (p == NULL) {
3140 *plist = new_p;
3141 } else {
3142 while (p->next() != NULL) {
3143 p = p->next();
3144 }
3145 p->set_next(new_p);
3146 }
3147 }
3149 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3150 if (plist == NULL)
3151 return;
3153 SystemProperty* new_p = new SystemProperty(k, v, true);
3154 PropertyList_add(plist, new_p);
3155 }
3157 // This add maintains unique property key in the list.
3158 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3159 if (plist == NULL)
3160 return;
3162 // If property key exist then update with new value.
3163 SystemProperty* prop;
3164 for (prop = *plist; prop != NULL; prop = prop->next()) {
3165 if (strcmp(k, prop->key()) == 0) {
3166 if (append) {
3167 prop->append_value(v);
3168 } else {
3169 prop->set_value(v);
3170 }
3171 return;
3172 }
3173 }
3175 PropertyList_add(plist, k, v);
3176 }
3178 #ifdef KERNEL
3179 char *Arguments::get_kernel_properties() {
3180 // Find properties starting with kernel and append them to string
3181 // We need to find out how long they are first because the URL's that they
3182 // might point to could get long.
3183 int length = 0;
3184 SystemProperty* prop;
3185 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3186 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3187 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3188 }
3189 }
3190 // Add one for null terminator.
3191 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3192 if (length != 0) {
3193 int pos = 0;
3194 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3195 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3196 jio_snprintf(&props[pos], length-pos,
3197 "-D%s=%s ", prop->key(), prop->value());
3198 pos = strlen(props);
3199 }
3200 }
3201 }
3202 // null terminate props in case of null
3203 props[length] = '\0';
3204 return props;
3205 }
3206 #endif // KERNEL
3208 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3209 // Returns true if all of the source pointed by src has been copied over to
3210 // the destination buffer pointed by buf. Otherwise, returns false.
3211 // Notes:
3212 // 1. If the length (buflen) of the destination buffer excluding the
3213 // NULL terminator character is not long enough for holding the expanded
3214 // pid characters, it also returns false instead of returning the partially
3215 // expanded one.
3216 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3217 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3218 char* buf, size_t buflen) {
3219 const char* p = src;
3220 char* b = buf;
3221 const char* src_end = &src[srclen];
3222 char* buf_end = &buf[buflen - 1];
3224 while (p < src_end && b < buf_end) {
3225 if (*p == '%') {
3226 switch (*(++p)) {
3227 case '%': // "%%" ==> "%"
3228 *b++ = *p++;
3229 break;
3230 case 'p': { // "%p" ==> current process id
3231 // buf_end points to the character before the last character so
3232 // that we could write '\0' to the end of the buffer.
3233 size_t buf_sz = buf_end - b + 1;
3234 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3236 // if jio_snprintf fails or the buffer is not long enough to hold
3237 // the expanded pid, returns false.
3238 if (ret < 0 || ret >= (int)buf_sz) {
3239 return false;
3240 } else {
3241 b += ret;
3242 assert(*b == '\0', "fail in copy_expand_pid");
3243 if (p == src_end && b == buf_end + 1) {
3244 // reach the end of the buffer.
3245 return true;
3246 }
3247 }
3248 p++;
3249 break;
3250 }
3251 default :
3252 *b++ = '%';
3253 }
3254 } else {
3255 *b++ = *p++;
3256 }
3257 }
3258 *b = '\0';
3259 return (p == src_end); // return false if not all of the source was copied
3260 }