Fri, 07 May 2010 13:14:41 -0400
6949307: G1: raise a vm error, do not core dump, if target pause time and target interval are inconsistent
Summary: First, change the guarantee to raising a vm error. Second, set the interval dynamically, and based on the pause time target, if it is not set explicitly.
Reviewed-by: ysr, johnc
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;
53 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
55 char* Arguments::SharedArchivePath = NULL;
57 AgentLibraryList Arguments::_libraryList;
58 AgentLibraryList Arguments::_agentList;
60 abort_hook_t Arguments::_abort_hook = NULL;
61 exit_hook_t Arguments::_exit_hook = NULL;
62 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
65 SystemProperty *Arguments::_java_ext_dirs = NULL;
66 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
67 SystemProperty *Arguments::_sun_boot_library_path = NULL;
68 SystemProperty *Arguments::_java_library_path = NULL;
69 SystemProperty *Arguments::_java_home = NULL;
70 SystemProperty *Arguments::_java_class_path = NULL;
71 SystemProperty *Arguments::_sun_boot_class_path = NULL;
73 char* Arguments::_meta_index_path = NULL;
74 char* Arguments::_meta_index_dir = NULL;
76 static bool force_client_mode = false;
78 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
80 static bool match_option(const JavaVMOption *option, const char* name,
81 const char** tail) {
82 int len = (int)strlen(name);
83 if (strncmp(option->optionString, name, len) == 0) {
84 *tail = option->optionString + len;
85 return true;
86 } else {
87 return false;
88 }
89 }
91 static void logOption(const char* opt) {
92 if (PrintVMOptions) {
93 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
94 }
95 }
97 // Process java launcher properties.
98 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
99 // See if sun.java.launcher or sun.java.launcher.pid is defined.
100 // Must do this before setting up other system properties,
101 // as some of them may depend on launcher type.
102 for (int index = 0; index < args->nOptions; index++) {
103 const JavaVMOption* option = args->options + index;
104 const char* tail;
106 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
107 process_java_launcher_argument(tail, option->extraInfo);
108 continue;
109 }
110 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
111 _sun_java_launcher_pid = atoi(tail);
112 continue;
113 }
114 }
115 }
117 // Initialize system properties key and value.
118 void Arguments::init_system_properties() {
120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
122 "Java Virtual Machine Specification", false));
123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
124 "Sun Microsystems Inc.", false));
125 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
130 // following are JVMTI agent writeable properties.
131 // Properties values are set to NULL and they are
132 // os specific they are initialized in os::init_system_properties_values().
133 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
134 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
135 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
136 _java_library_path = new SystemProperty("java.library.path", NULL, true);
137 _java_home = new SystemProperty("java.home", NULL, true);
138 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
140 _java_class_path = new SystemProperty("java.class.path", "", true);
142 // Add to System Property list.
143 PropertyList_add(&_system_properties, _java_ext_dirs);
144 PropertyList_add(&_system_properties, _java_endorsed_dirs);
145 PropertyList_add(&_system_properties, _sun_boot_library_path);
146 PropertyList_add(&_system_properties, _java_library_path);
147 PropertyList_add(&_system_properties, _java_home);
148 PropertyList_add(&_system_properties, _java_class_path);
149 PropertyList_add(&_system_properties, _sun_boot_class_path);
151 // Set OS specific system properties values
152 os::init_system_properties_values();
153 }
155 /**
156 * Provide a slightly more user-friendly way of eliminating -XX flags.
157 * When a flag is eliminated, it can be added to this list in order to
158 * continue accepting this flag on the command-line, while issuing a warning
159 * and ignoring the value. Once the JDK version reaches the 'accept_until'
160 * limit, we flatly refuse to admit the existence of the flag. This allows
161 * a flag to die correctly over JDK releases using HSX.
162 */
163 typedef struct {
164 const char* name;
165 JDK_Version obsoleted_in; // when the flag went away
166 JDK_Version accept_until; // which version to start denying the existence
167 } ObsoleteFlag;
169 static ObsoleteFlag obsolete_jvm_flags[] = {
170 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
171 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
184 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
185 { "DefaultInitialRAMFraction",
186 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
187 { NULL, JDK_Version(0), JDK_Version(0) }
188 };
190 // Returns true if the flag is obsolete and fits into the range specified
191 // for being ignored. In the case that the flag is ignored, the 'version'
192 // value is filled in with the version number when the flag became
193 // obsolete so that that value can be displayed to the user.
194 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
195 int i = 0;
196 assert(version != NULL, "Must provide a version buffer");
197 while (obsolete_jvm_flags[i].name != NULL) {
198 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
199 // <flag>=xxx form
200 // [-|+]<flag> form
201 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
202 ((s[0] == '+' || s[0] == '-') &&
203 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
204 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
205 *version = flag_status.obsoleted_in;
206 return true;
207 }
208 }
209 i++;
210 }
211 return false;
212 }
214 // Constructs the system class path (aka boot class path) from the following
215 // components, in order:
216 //
217 // prefix // from -Xbootclasspath/p:...
218 // endorsed // the expansion of -Djava.endorsed.dirs=...
219 // base // from os::get_system_properties() or -Xbootclasspath=
220 // suffix // from -Xbootclasspath/a:...
221 //
222 // java.endorsed.dirs is a list of directories; any jar or zip files in the
223 // directories are added to the sysclasspath just before the base.
224 //
225 // This could be AllStatic, but it isn't needed after argument processing is
226 // complete.
227 class SysClassPath: public StackObj {
228 public:
229 SysClassPath(const char* base);
230 ~SysClassPath();
232 inline void set_base(const char* base);
233 inline void add_prefix(const char* prefix);
234 inline void add_suffix_to_prefix(const char* suffix);
235 inline void add_suffix(const char* suffix);
236 inline void reset_path(const char* base);
238 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
239 // property. Must be called after all command-line arguments have been
240 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
241 // combined_path().
242 void expand_endorsed();
244 inline const char* get_base() const { return _items[_scp_base]; }
245 inline const char* get_prefix() const { return _items[_scp_prefix]; }
246 inline const char* get_suffix() const { return _items[_scp_suffix]; }
247 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
249 // Combine all the components into a single c-heap-allocated string; caller
250 // must free the string if/when no longer needed.
251 char* combined_path();
253 private:
254 // Utility routines.
255 static char* add_to_path(const char* path, const char* str, bool prepend);
256 static char* add_jars_to_path(char* path, const char* directory);
258 inline void reset_item_at(int index);
260 // Array indices for the items that make up the sysclasspath. All except the
261 // base are allocated in the C heap and freed by this class.
262 enum {
263 _scp_prefix, // from -Xbootclasspath/p:...
264 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
265 _scp_base, // the default sysclasspath
266 _scp_suffix, // from -Xbootclasspath/a:...
267 _scp_nitems // the number of items, must be last.
268 };
270 const char* _items[_scp_nitems];
271 DEBUG_ONLY(bool _expansion_done;)
272 };
274 SysClassPath::SysClassPath(const char* base) {
275 memset(_items, 0, sizeof(_items));
276 _items[_scp_base] = base;
277 DEBUG_ONLY(_expansion_done = false;)
278 }
280 SysClassPath::~SysClassPath() {
281 // Free everything except the base.
282 for (int i = 0; i < _scp_nitems; ++i) {
283 if (i != _scp_base) reset_item_at(i);
284 }
285 DEBUG_ONLY(_expansion_done = false;)
286 }
288 inline void SysClassPath::set_base(const char* base) {
289 _items[_scp_base] = base;
290 }
292 inline void SysClassPath::add_prefix(const char* prefix) {
293 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
294 }
296 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
297 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
298 }
300 inline void SysClassPath::add_suffix(const char* suffix) {
301 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
302 }
304 inline void SysClassPath::reset_item_at(int index) {
305 assert(index < _scp_nitems && index != _scp_base, "just checking");
306 if (_items[index] != NULL) {
307 FREE_C_HEAP_ARRAY(char, _items[index]);
308 _items[index] = NULL;
309 }
310 }
312 inline void SysClassPath::reset_path(const char* base) {
313 // Clear the prefix and suffix.
314 reset_item_at(_scp_prefix);
315 reset_item_at(_scp_suffix);
316 set_base(base);
317 }
319 //------------------------------------------------------------------------------
321 void SysClassPath::expand_endorsed() {
322 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
324 const char* path = Arguments::get_property("java.endorsed.dirs");
325 if (path == NULL) {
326 path = Arguments::get_endorsed_dir();
327 assert(path != NULL, "no default for java.endorsed.dirs");
328 }
330 char* expanded_path = NULL;
331 const char separator = *os::path_separator();
332 const char* const end = path + strlen(path);
333 while (path < end) {
334 const char* tmp_end = strchr(path, separator);
335 if (tmp_end == NULL) {
336 expanded_path = add_jars_to_path(expanded_path, path);
337 path = end;
338 } else {
339 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
340 memcpy(dirpath, path, tmp_end - path);
341 dirpath[tmp_end - path] = '\0';
342 expanded_path = add_jars_to_path(expanded_path, dirpath);
343 FREE_C_HEAP_ARRAY(char, dirpath);
344 path = tmp_end + 1;
345 }
346 }
347 _items[_scp_endorsed] = expanded_path;
348 DEBUG_ONLY(_expansion_done = true;)
349 }
351 // Combine the bootclasspath elements, some of which may be null, into a single
352 // c-heap-allocated string.
353 char* SysClassPath::combined_path() {
354 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
355 assert(_expansion_done, "must call expand_endorsed() first.");
357 size_t lengths[_scp_nitems];
358 size_t total_len = 0;
360 const char separator = *os::path_separator();
362 // Get the lengths.
363 int i;
364 for (i = 0; i < _scp_nitems; ++i) {
365 if (_items[i] != NULL) {
366 lengths[i] = strlen(_items[i]);
367 // Include space for the separator char (or a NULL for the last item).
368 total_len += lengths[i] + 1;
369 }
370 }
371 assert(total_len > 0, "empty sysclasspath not allowed");
373 // Copy the _items to a single string.
374 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
375 char* cp_tmp = cp;
376 for (i = 0; i < _scp_nitems; ++i) {
377 if (_items[i] != NULL) {
378 memcpy(cp_tmp, _items[i], lengths[i]);
379 cp_tmp += lengths[i];
380 *cp_tmp++ = separator;
381 }
382 }
383 *--cp_tmp = '\0'; // Replace the extra separator.
384 return cp;
385 }
387 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
388 char*
389 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
390 char *cp;
392 assert(str != NULL, "just checking");
393 if (path == NULL) {
394 size_t len = strlen(str) + 1;
395 cp = NEW_C_HEAP_ARRAY(char, len);
396 memcpy(cp, str, len); // copy the trailing null
397 } else {
398 const char separator = *os::path_separator();
399 size_t old_len = strlen(path);
400 size_t str_len = strlen(str);
401 size_t len = old_len + str_len + 2;
403 if (prepend) {
404 cp = NEW_C_HEAP_ARRAY(char, len);
405 char* cp_tmp = cp;
406 memcpy(cp_tmp, str, str_len);
407 cp_tmp += str_len;
408 *cp_tmp = separator;
409 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
410 FREE_C_HEAP_ARRAY(char, path);
411 } else {
412 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
413 char* cp_tmp = cp + old_len;
414 *cp_tmp = separator;
415 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
416 }
417 }
418 return cp;
419 }
421 // Scan the directory and append any jar or zip files found to path.
422 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
423 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
424 DIR* dir = os::opendir(directory);
425 if (dir == NULL) return path;
427 char dir_sep[2] = { '\0', '\0' };
428 size_t directory_len = strlen(directory);
429 const char fileSep = *os::file_separator();
430 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
432 /* Scan the directory for jars/zips, appending them to path. */
433 struct dirent *entry;
434 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
435 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
436 const char* name = entry->d_name;
437 const char* ext = name + strlen(name) - 4;
438 bool isJarOrZip = ext > name &&
439 (os::file_name_strcmp(ext, ".jar") == 0 ||
440 os::file_name_strcmp(ext, ".zip") == 0);
441 if (isJarOrZip) {
442 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
443 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
444 path = add_to_path(path, jarpath, false);
445 FREE_C_HEAP_ARRAY(char, jarpath);
446 }
447 }
448 FREE_C_HEAP_ARRAY(char, dbuf);
449 os::closedir(dir);
450 return path;
451 }
453 // Parses a memory size specification string.
454 static bool atomull(const char *s, julong* result) {
455 julong n = 0;
456 int args_read = sscanf(s, os::julong_format_specifier(), &n);
457 if (args_read != 1) {
458 return false;
459 }
460 while (*s != '\0' && isdigit(*s)) {
461 s++;
462 }
463 // 4705540: illegal if more characters are found after the first non-digit
464 if (strlen(s) > 1) {
465 return false;
466 }
467 switch (*s) {
468 case 'T': case 't':
469 *result = n * G * K;
470 // Check for overflow.
471 if (*result/((julong)G * K) != n) return false;
472 return true;
473 case 'G': case 'g':
474 *result = n * G;
475 if (*result/G != n) return false;
476 return true;
477 case 'M': case 'm':
478 *result = n * M;
479 if (*result/M != n) return false;
480 return true;
481 case 'K': case 'k':
482 *result = n * K;
483 if (*result/K != n) return false;
484 return true;
485 case '\0':
486 *result = n;
487 return true;
488 default:
489 return false;
490 }
491 }
493 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
494 if (size < min_size) return arg_too_small;
495 // Check that size will fit in a size_t (only relevant on 32-bit)
496 if (size > max_uintx) return arg_too_big;
497 return arg_in_range;
498 }
500 // Describe an argument out of range error
501 void Arguments::describe_range_error(ArgsRange errcode) {
502 switch(errcode) {
503 case arg_too_big:
504 jio_fprintf(defaultStream::error_stream(),
505 "The specified size exceeds the maximum "
506 "representable size.\n");
507 break;
508 case arg_too_small:
509 case arg_unreadable:
510 case arg_in_range:
511 // do nothing for now
512 break;
513 default:
514 ShouldNotReachHere();
515 }
516 }
518 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
519 return CommandLineFlags::boolAtPut(name, &value, origin);
520 }
522 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
523 double v;
524 if (sscanf(value, "%lf", &v) != 1) {
525 return false;
526 }
528 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
529 return true;
530 }
531 return false;
532 }
534 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
535 julong v;
536 intx intx_v;
537 bool is_neg = false;
538 // Check the sign first since atomull() parses only unsigned values.
539 if (*value == '-') {
540 if (!CommandLineFlags::intxAt(name, &intx_v)) {
541 return false;
542 }
543 value++;
544 is_neg = true;
545 }
546 if (!atomull(value, &v)) {
547 return false;
548 }
549 intx_v = (intx) v;
550 if (is_neg) {
551 intx_v = -intx_v;
552 }
553 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
554 return true;
555 }
556 uintx uintx_v = (uintx) v;
557 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
558 return true;
559 }
560 uint64_t uint64_t_v = (uint64_t) v;
561 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
562 return true;
563 }
564 return false;
565 }
567 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
568 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
569 // Contract: CommandLineFlags always returns a pointer that needs freeing.
570 FREE_C_HEAP_ARRAY(char, value);
571 return true;
572 }
574 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
575 const char* old_value = "";
576 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
577 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
578 size_t new_len = strlen(new_value);
579 const char* value;
580 char* free_this_too = NULL;
581 if (old_len == 0) {
582 value = new_value;
583 } else if (new_len == 0) {
584 value = old_value;
585 } else {
586 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
587 // each new setting adds another LINE to the switch:
588 sprintf(buf, "%s\n%s", old_value, new_value);
589 value = buf;
590 free_this_too = buf;
591 }
592 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
593 // CommandLineFlags always returns a pointer that needs freeing.
594 FREE_C_HEAP_ARRAY(char, value);
595 if (free_this_too != NULL) {
596 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
597 FREE_C_HEAP_ARRAY(char, free_this_too);
598 }
599 return true;
600 }
602 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
604 // range of acceptable characters spelled out for portability reasons
605 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
606 #define BUFLEN 255
607 char name[BUFLEN+1];
608 char dummy;
610 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
611 return set_bool_flag(name, false, origin);
612 }
613 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
614 return set_bool_flag(name, true, origin);
615 }
617 char punct;
618 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
619 const char* value = strchr(arg, '=') + 1;
620 Flag* flag = Flag::find_flag(name, strlen(name));
621 if (flag != NULL && flag->is_ccstr()) {
622 if (flag->ccstr_accumulates()) {
623 return append_to_string_flag(name, value, origin);
624 } else {
625 if (value[0] == '\0') {
626 value = NULL;
627 }
628 return set_string_flag(name, value, origin);
629 }
630 }
631 }
633 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
634 const char* value = strchr(arg, '=') + 1;
635 // -XX:Foo:=xxx will reset the string flag to the given value.
636 if (value[0] == '\0') {
637 value = NULL;
638 }
639 return set_string_flag(name, value, origin);
640 }
642 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
643 #define SIGNED_NUMBER_RANGE "[-0123456789]"
644 #define NUMBER_RANGE "[0123456789]"
645 char value[BUFLEN + 1];
646 char value2[BUFLEN + 1];
647 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
648 // Looks like a floating-point number -- try again with more lenient format string
649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
650 return set_fp_numeric_flag(name, value, origin);
651 }
652 }
654 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
655 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
656 return set_numeric_flag(name, value, origin);
657 }
659 return false;
660 }
662 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
663 assert(bldarray != NULL, "illegal argument");
665 if (arg == NULL) {
666 return;
667 }
669 int index = *count;
671 // expand the array and add arg to the last element
672 (*count)++;
673 if (*bldarray == NULL) {
674 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
675 } else {
676 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
677 }
678 (*bldarray)[index] = strdup(arg);
679 }
681 void Arguments::build_jvm_args(const char* arg) {
682 add_string(&_jvm_args_array, &_num_jvm_args, arg);
683 }
685 void Arguments::build_jvm_flags(const char* arg) {
686 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
687 }
689 // utility function to return a string that concatenates all
690 // strings in a given char** array
691 const char* Arguments::build_resource_string(char** args, int count) {
692 if (args == NULL || count == 0) {
693 return NULL;
694 }
695 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
696 for (int i = 1; i < count; i++) {
697 length += strlen(args[i]) + 1; // add 1 for a space
698 }
699 char* s = NEW_RESOURCE_ARRAY(char, length);
700 strcpy(s, args[0]);
701 for (int j = 1; j < count; j++) {
702 strcat(s, " ");
703 strcat(s, args[j]);
704 }
705 return (const char*) s;
706 }
708 void Arguments::print_on(outputStream* st) {
709 st->print_cr("VM Arguments:");
710 if (num_jvm_flags() > 0) {
711 st->print("jvm_flags: "); print_jvm_flags_on(st);
712 }
713 if (num_jvm_args() > 0) {
714 st->print("jvm_args: "); print_jvm_args_on(st);
715 }
716 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
717 st->print_cr("Launcher Type: %s", _sun_java_launcher);
718 }
720 void Arguments::print_jvm_flags_on(outputStream* st) {
721 if (_num_jvm_flags > 0) {
722 for (int i=0; i < _num_jvm_flags; i++) {
723 st->print("%s ", _jvm_flags_array[i]);
724 }
725 st->print_cr("");
726 }
727 }
729 void Arguments::print_jvm_args_on(outputStream* st) {
730 if (_num_jvm_args > 0) {
731 for (int i=0; i < _num_jvm_args; i++) {
732 st->print("%s ", _jvm_args_array[i]);
733 }
734 st->print_cr("");
735 }
736 }
738 bool Arguments::process_argument(const char* arg,
739 jboolean ignore_unrecognized, FlagValueOrigin origin) {
741 JDK_Version since = JDK_Version();
743 if (parse_argument(arg, origin)) {
744 // do nothing
745 } else if (is_newly_obsolete(arg, &since)) {
746 enum { bufsize = 256 };
747 char buffer[bufsize];
748 since.to_string(buffer, bufsize);
749 jio_fprintf(defaultStream::error_stream(),
750 "Warning: The flag %s has been EOL'd as of %s and will"
751 " be ignored\n", arg, buffer);
752 } else {
753 if (!ignore_unrecognized) {
754 jio_fprintf(defaultStream::error_stream(),
755 "Unrecognized VM option '%s'\n", arg);
756 // allow for commandline "commenting out" options like -XX:#+Verbose
757 if (strlen(arg) == 0 || arg[0] != '#') {
758 return false;
759 }
760 }
761 }
762 return true;
763 }
765 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
766 FILE* stream = fopen(file_name, "rb");
767 if (stream == NULL) {
768 if (should_exist) {
769 jio_fprintf(defaultStream::error_stream(),
770 "Could not open settings file %s\n", file_name);
771 return false;
772 } else {
773 return true;
774 }
775 }
777 char token[1024];
778 int pos = 0;
780 bool in_white_space = true;
781 bool in_comment = false;
782 bool in_quote = false;
783 char quote_c = 0;
784 bool result = true;
786 int c = getc(stream);
787 while(c != EOF) {
788 if (in_white_space) {
789 if (in_comment) {
790 if (c == '\n') in_comment = false;
791 } else {
792 if (c == '#') in_comment = true;
793 else if (!isspace(c)) {
794 in_white_space = false;
795 token[pos++] = c;
796 }
797 }
798 } else {
799 if (c == '\n' || (!in_quote && isspace(c))) {
800 // token ends at newline, or at unquoted whitespace
801 // this allows a way to include spaces in string-valued options
802 token[pos] = '\0';
803 logOption(token);
804 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
805 build_jvm_flags(token);
806 pos = 0;
807 in_white_space = true;
808 in_quote = false;
809 } else if (!in_quote && (c == '\'' || c == '"')) {
810 in_quote = true;
811 quote_c = c;
812 } else if (in_quote && (c == quote_c)) {
813 in_quote = false;
814 } else {
815 token[pos++] = c;
816 }
817 }
818 c = getc(stream);
819 }
820 if (pos > 0) {
821 token[pos] = '\0';
822 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
823 build_jvm_flags(token);
824 }
825 fclose(stream);
826 return result;
827 }
829 //=============================================================================================================
830 // Parsing of properties (-D)
832 const char* Arguments::get_property(const char* key) {
833 return PropertyList_get_value(system_properties(), key);
834 }
836 bool Arguments::add_property(const char* prop) {
837 const char* eq = strchr(prop, '=');
838 char* key;
839 // ns must be static--its address may be stored in a SystemProperty object.
840 const static char ns[1] = {0};
841 char* value = (char *)ns;
843 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
844 key = AllocateHeap(key_len + 1, "add_property");
845 strncpy(key, prop, key_len);
846 key[key_len] = '\0';
848 if (eq != NULL) {
849 size_t value_len = strlen(prop) - key_len - 1;
850 value = AllocateHeap(value_len + 1, "add_property");
851 strncpy(value, &prop[key_len + 1], value_len + 1);
852 }
854 if (strcmp(key, "java.compiler") == 0) {
855 process_java_compiler_argument(value);
856 FreeHeap(key);
857 if (eq != NULL) {
858 FreeHeap(value);
859 }
860 return true;
861 } else if (strcmp(key, "sun.java.command") == 0) {
862 _java_command = value;
864 // don't add this property to the properties exposed to the java application
865 FreeHeap(key);
866 return true;
867 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
868 // launcher.pid property is private and is processed
869 // in process_sun_java_launcher_properties();
870 // the sun.java.launcher property is passed on to the java application
871 FreeHeap(key);
872 if (eq != NULL) {
873 FreeHeap(value);
874 }
875 return true;
876 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
877 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
878 // its value without going through the property list or making a Java call.
879 _java_vendor_url_bug = value;
880 } else if (strcmp(key, "sun.boot.library.path") == 0) {
881 PropertyList_unique_add(&_system_properties, key, value, true);
882 return true;
883 }
884 // Create new property and add at the end of the list
885 PropertyList_unique_add(&_system_properties, key, value);
886 return true;
887 }
889 //===========================================================================================================
890 // Setting int/mixed/comp mode flags
892 void Arguments::set_mode_flags(Mode mode) {
893 // Set up default values for all flags.
894 // If you add a flag to any of the branches below,
895 // add a default value for it here.
896 set_java_compiler(false);
897 _mode = mode;
899 // Ensure Agent_OnLoad has the correct initial values.
900 // This may not be the final mode; mode may change later in onload phase.
901 PropertyList_unique_add(&_system_properties, "java.vm.info",
902 (char*)Abstract_VM_Version::vm_info_string(), false);
904 UseInterpreter = true;
905 UseCompiler = true;
906 UseLoopCounter = true;
908 // Default values may be platform/compiler dependent -
909 // use the saved values
910 ClipInlining = Arguments::_ClipInlining;
911 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
912 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
913 BackgroundCompilation = Arguments::_BackgroundCompilation;
914 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
916 // Change from defaults based on mode
917 switch (mode) {
918 default:
919 ShouldNotReachHere();
920 break;
921 case _int:
922 UseCompiler = false;
923 UseLoopCounter = false;
924 AlwaysCompileLoopMethods = false;
925 UseOnStackReplacement = false;
926 break;
927 case _mixed:
928 // same as default
929 break;
930 case _comp:
931 UseInterpreter = false;
932 BackgroundCompilation = false;
933 ClipInlining = false;
934 break;
935 }
936 }
938 // Conflict: required to use shared spaces (-Xshare:on), but
939 // incompatible command line options were chosen.
941 static void no_shared_spaces() {
942 if (RequireSharedSpaces) {
943 jio_fprintf(defaultStream::error_stream(),
944 "Class data sharing is inconsistent with other specified options.\n");
945 vm_exit_during_initialization("Unable to use shared archive.", NULL);
946 } else {
947 FLAG_SET_DEFAULT(UseSharedSpaces, false);
948 }
949 }
951 #ifndef KERNEL
952 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
953 // if it's not explictly set or unset. If the user has chosen
954 // UseParNewGC and not explicitly set ParallelGCThreads we
955 // set it, unless this is a single cpu machine.
956 void Arguments::set_parnew_gc_flags() {
957 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
958 "control point invariant");
959 assert(UseParNewGC, "Error");
961 // Turn off AdaptiveSizePolicy by default for parnew until it is
962 // complete.
963 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
964 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
965 }
967 if (ParallelGCThreads == 0) {
968 FLAG_SET_DEFAULT(ParallelGCThreads,
969 Abstract_VM_Version::parallel_worker_threads());
970 if (ParallelGCThreads == 1) {
971 FLAG_SET_DEFAULT(UseParNewGC, false);
972 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
973 }
974 }
975 if (UseParNewGC) {
976 // CDS doesn't work with ParNew yet
977 no_shared_spaces();
979 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
980 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
981 // we set them to 1024 and 1024.
982 // See CR 6362902.
983 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
984 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
985 }
986 if (FLAG_IS_DEFAULT(OldPLABSize)) {
987 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
988 }
990 // AlwaysTenure flag should make ParNew promote all at first collection.
991 // See CR 6362902.
992 if (AlwaysTenure) {
993 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
994 }
995 // When using compressed oops, we use local overflow stacks,
996 // rather than using a global overflow list chained through
997 // the klass word of the object's pre-image.
998 if (UseCompressedOops && !ParGCUseLocalOverflow) {
999 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1000 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1001 }
1002 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1003 }
1004 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1005 }
1006 }
1008 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1009 // sparc/solaris for certain applications, but would gain from
1010 // further optimization and tuning efforts, and would almost
1011 // certainly gain from analysis of platform and environment.
1012 void Arguments::set_cms_and_parnew_gc_flags() {
1013 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1014 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1016 // If we are using CMS, we prefer to UseParNewGC,
1017 // unless explicitly forbidden.
1018 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1019 FLAG_SET_ERGO(bool, UseParNewGC, true);
1020 }
1022 // Turn off AdaptiveSizePolicy by default for cms until it is
1023 // complete.
1024 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1025 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1026 }
1028 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1029 // as needed.
1030 if (UseParNewGC) {
1031 set_parnew_gc_flags();
1032 }
1034 // Now make adjustments for CMS
1035 size_t young_gen_per_worker;
1036 intx new_ratio;
1037 size_t min_new_default;
1038 intx tenuring_default;
1039 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1040 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1041 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1042 }
1043 young_gen_per_worker = 4*M;
1044 new_ratio = (intx)15;
1045 min_new_default = 4*M;
1046 tenuring_default = (intx)0;
1047 } else { // new defaults: "new" as of 6.0
1048 young_gen_per_worker = CMSYoungGenPerWorker;
1049 new_ratio = (intx)7;
1050 min_new_default = 16*M;
1051 tenuring_default = (intx)4;
1052 }
1054 // Preferred young gen size for "short" pauses
1055 const uintx parallel_gc_threads =
1056 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1057 const size_t preferred_max_new_size_unaligned =
1058 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1059 const size_t preferred_max_new_size =
1060 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1062 // Unless explicitly requested otherwise, size young gen
1063 // for "short" pauses ~ 4M*ParallelGCThreads
1065 // If either MaxNewSize or NewRatio is set on the command line,
1066 // assume the user is trying to set the size of the young gen.
1068 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1070 // Set MaxNewSize to our calculated preferred_max_new_size unless
1071 // NewSize was set on the command line and it is larger than
1072 // preferred_max_new_size.
1073 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1074 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1075 } else {
1076 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1077 }
1078 if (PrintGCDetails && Verbose) {
1079 // Too early to use gclog_or_tty
1080 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1081 }
1083 // Unless explicitly requested otherwise, prefer a large
1084 // Old to Young gen size so as to shift the collection load
1085 // to the old generation concurrent collector
1087 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1088 // then NewSize and OldSize may be calculated. That would
1089 // generally lead to some differences with ParNewGC for which
1090 // there was no obvious reason. Also limit to the case where
1091 // MaxNewSize has not been set.
1093 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1095 // Code along this path potentially sets NewSize and OldSize
1097 // Calculate the desired minimum size of the young gen but if
1098 // NewSize has been set on the command line, use it here since
1099 // it should be the final value.
1100 size_t min_new;
1101 if (FLAG_IS_DEFAULT(NewSize)) {
1102 min_new = align_size_up(ScaleForWordSize(min_new_default),
1103 os::vm_page_size());
1104 } else {
1105 min_new = NewSize;
1106 }
1107 size_t prev_initial_size = InitialHeapSize;
1108 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1109 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1110 // Currently minimum size and the initial heap sizes are the same.
1111 set_min_heap_size(InitialHeapSize);
1112 if (PrintGCDetails && Verbose) {
1113 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1114 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1115 InitialHeapSize/M, prev_initial_size/M);
1116 }
1117 }
1119 // MaxHeapSize is aligned down in collectorPolicy
1120 size_t max_heap =
1121 align_size_down(MaxHeapSize,
1122 CardTableRS::ct_max_alignment_constraint());
1124 if (PrintGCDetails && Verbose) {
1125 // Too early to use gclog_or_tty
1126 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1127 " initial_heap_size: " SIZE_FORMAT
1128 " max_heap: " SIZE_FORMAT,
1129 min_heap_size(), InitialHeapSize, max_heap);
1130 }
1131 if (max_heap > min_new) {
1132 // Unless explicitly requested otherwise, make young gen
1133 // at least min_new, and at most preferred_max_new_size.
1134 if (FLAG_IS_DEFAULT(NewSize)) {
1135 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1136 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1137 if (PrintGCDetails && Verbose) {
1138 // Too early to use gclog_or_tty
1139 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1140 }
1141 }
1142 // Unless explicitly requested otherwise, size old gen
1143 // so that it's at least 3X of NewSize to begin with;
1144 // later NewRatio will decide how it grows; see above.
1145 if (FLAG_IS_DEFAULT(OldSize)) {
1146 if (max_heap > NewSize) {
1147 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1148 if (PrintGCDetails && Verbose) {
1149 // Too early to use gclog_or_tty
1150 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1151 }
1152 }
1153 }
1154 }
1155 }
1156 // Unless explicitly requested otherwise, definitely
1157 // promote all objects surviving "tenuring_default" scavenges.
1158 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1159 FLAG_IS_DEFAULT(SurvivorRatio)) {
1160 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1161 }
1162 // If we decided above (or user explicitly requested)
1163 // `promote all' (via MaxTenuringThreshold := 0),
1164 // prefer minuscule survivor spaces so as not to waste
1165 // space for (non-existent) survivors
1166 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1167 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1168 }
1169 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1170 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1171 // This is done in order to make ParNew+CMS configuration to work
1172 // with YoungPLABSize and OldPLABSize options.
1173 // See CR 6362902.
1174 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1175 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1176 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1177 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1178 // the value (either from the command line or ergonomics) of
1179 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1180 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1181 } else {
1182 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1183 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1184 // we'll let it to take precedence.
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1187 " options are specified for the CMS collector."
1188 " CMSParPromoteBlocksToClaim will take precedence.\n");
1189 }
1190 }
1191 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1192 // OldPLAB sizing manually turned off: Use a larger default setting,
1193 // unless it was manually specified. This is because a too-low value
1194 // will slow down scavenges.
1195 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1196 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1197 }
1198 }
1199 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1200 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1201 // If either of the static initialization defaults have changed, note this
1202 // modification.
1203 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1204 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1205 }
1206 if (PrintGCDetails && Verbose) {
1207 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1208 MarkStackSize / K, MarkStackSizeMax / K);
1209 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1210 }
1211 }
1212 #endif // KERNEL
1214 void set_object_alignment() {
1215 // Object alignment.
1216 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1217 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1218 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1219 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1220 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1221 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1223 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1224 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1226 // Oop encoding heap max
1227 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1229 #ifndef KERNEL
1230 // Set CMS global values
1231 CompactibleFreeListSpace::set_cms_values();
1232 #endif // KERNEL
1233 }
1235 bool verify_object_alignment() {
1236 // Object alignment.
1237 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1238 jio_fprintf(defaultStream::error_stream(),
1239 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes);
1240 return false;
1241 }
1242 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1243 jio_fprintf(defaultStream::error_stream(),
1244 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong);
1245 return false;
1246 }
1247 return true;
1248 }
1250 inline uintx max_heap_for_compressed_oops() {
1251 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1252 NOT_LP64(ShouldNotReachHere(); return 0);
1253 }
1255 bool Arguments::should_auto_select_low_pause_collector() {
1256 if (UseAutoGCSelectPolicy &&
1257 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1258 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1259 if (PrintGCDetails) {
1260 // Cannot use gclog_or_tty yet.
1261 tty->print_cr("Automatic selection of the low pause collector"
1262 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1263 }
1264 return true;
1265 }
1266 return false;
1267 }
1269 void Arguments::set_ergonomics_flags() {
1270 // Parallel GC is not compatible with sharing. If one specifies
1271 // that they want sharing explicitly, do not set ergonomics flags.
1272 if (DumpSharedSpaces || ForceSharedSpaces) {
1273 return;
1274 }
1276 if (os::is_server_class_machine() && !force_client_mode ) {
1277 // If no other collector is requested explicitly,
1278 // let the VM select the collector based on
1279 // machine class and automatic selection policy.
1280 if (!UseSerialGC &&
1281 !UseConcMarkSweepGC &&
1282 !UseG1GC &&
1283 !UseParNewGC &&
1284 !DumpSharedSpaces &&
1285 FLAG_IS_DEFAULT(UseParallelGC)) {
1286 if (should_auto_select_low_pause_collector()) {
1287 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1288 } else {
1289 FLAG_SET_ERGO(bool, UseParallelGC, true);
1290 }
1291 no_shared_spaces();
1292 }
1293 }
1295 #ifndef ZERO
1296 #ifdef _LP64
1297 // Check that UseCompressedOops can be set with the max heap size allocated
1298 // by ergonomics.
1299 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1300 #ifndef COMPILER1
1301 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1302 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1303 }
1304 #endif
1305 #ifdef _WIN64
1306 if (UseLargePages && UseCompressedOops) {
1307 // Cannot allocate guard pages for implicit checks in indexed addressing
1308 // mode, when large pages are specified on windows.
1309 // This flag could be switched ON if narrow oop base address is set to 0,
1310 // see code in Universe::initialize_heap().
1311 Universe::set_narrow_oop_use_implicit_null_checks(false);
1312 }
1313 #endif // _WIN64
1314 } else {
1315 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1316 warning("Max heap size too large for Compressed Oops");
1317 FLAG_SET_DEFAULT(UseCompressedOops, false);
1318 }
1319 }
1320 // Also checks that certain machines are slower with compressed oops
1321 // in vm_version initialization code.
1322 #endif // _LP64
1323 #endif // !ZERO
1324 }
1326 void Arguments::set_parallel_gc_flags() {
1327 assert(UseParallelGC || UseParallelOldGC, "Error");
1328 // If parallel old was requested, automatically enable parallel scavenge.
1329 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1330 FLAG_SET_DEFAULT(UseParallelGC, true);
1331 }
1333 // If no heap maximum was requested explicitly, use some reasonable fraction
1334 // of the physical memory, up to a maximum of 1GB.
1335 if (UseParallelGC) {
1336 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1337 Abstract_VM_Version::parallel_worker_threads());
1339 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1340 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1341 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1342 // See CR 6362902 for details.
1343 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1345 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1346 }
1347 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1348 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1349 }
1350 }
1352 if (UseParallelOldGC) {
1353 // Par compact uses lower default values since they are treated as
1354 // minimums. These are different defaults because of the different
1355 // interpretation and are not ergonomically set.
1356 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1357 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1358 }
1359 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1360 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1361 }
1362 }
1363 }
1364 }
1366 void Arguments::set_g1_gc_flags() {
1367 assert(UseG1GC, "Error");
1368 #ifdef COMPILER1
1369 FastTLABRefill = false;
1370 #endif
1371 FLAG_SET_DEFAULT(ParallelGCThreads,
1372 Abstract_VM_Version::parallel_worker_threads());
1373 if (ParallelGCThreads == 0) {
1374 FLAG_SET_DEFAULT(ParallelGCThreads,
1375 Abstract_VM_Version::parallel_worker_threads());
1376 }
1377 no_shared_spaces();
1379 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1380 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1381 }
1382 if (PrintGCDetails && Verbose) {
1383 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1384 MarkStackSize / K, MarkStackSizeMax / K);
1385 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1386 }
1388 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1389 // In G1, we want the default GC overhead goal to be higher than
1390 // say in PS. So we set it here to 10%. Otherwise the heap might
1391 // be expanded more aggressively than we would like it to. In
1392 // fact, even 10% seems to not be high enough in some cases
1393 // (especially small GC stress tests that the main thing they do
1394 // is allocation). We might consider increase it further.
1395 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1396 }
1397 }
1399 void Arguments::set_heap_size() {
1400 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1401 // Deprecated flag
1402 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1403 }
1405 const julong phys_mem =
1406 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1407 : (julong)MaxRAM;
1409 // If the maximum heap size has not been set with -Xmx,
1410 // then set it as fraction of the size of physical memory,
1411 // respecting the maximum and minimum sizes of the heap.
1412 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1413 julong reasonable_max = phys_mem / MaxRAMFraction;
1415 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1416 // Small physical memory, so use a minimum fraction of it for the heap
1417 reasonable_max = phys_mem / MinRAMFraction;
1418 } else {
1419 // Not-small physical memory, so require a heap at least
1420 // as large as MaxHeapSize
1421 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1422 }
1423 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1424 // Limit the heap size to ErgoHeapSizeLimit
1425 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1426 }
1427 if (UseCompressedOops) {
1428 // Limit the heap size to the maximum possible when using compressed oops
1429 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1430 }
1431 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1433 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1434 // An initial heap size was specified on the command line,
1435 // so be sure that the maximum size is consistent. Done
1436 // after call to allocatable_physical_memory because that
1437 // method might reduce the allocation size.
1438 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1439 }
1441 if (PrintGCDetails && Verbose) {
1442 // Cannot use gclog_or_tty yet.
1443 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1444 }
1445 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1446 }
1448 // If the initial_heap_size has not been set with InitialHeapSize
1449 // or -Xms, then set it as fraction of the size of physical memory,
1450 // respecting the maximum and minimum sizes of the heap.
1451 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1452 julong reasonable_minimum = (julong)(OldSize + NewSize);
1454 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1456 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1458 julong reasonable_initial = phys_mem / InitialRAMFraction;
1460 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1461 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1463 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1465 if (PrintGCDetails && Verbose) {
1466 // Cannot use gclog_or_tty yet.
1467 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1468 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1469 }
1470 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1471 set_min_heap_size((uintx)reasonable_minimum);
1472 }
1473 }
1475 // This must be called after ergonomics because we want bytecode rewriting
1476 // if the server compiler is used, or if UseSharedSpaces is disabled.
1477 void Arguments::set_bytecode_flags() {
1478 // Better not attempt to store into a read-only space.
1479 if (UseSharedSpaces) {
1480 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1481 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1482 }
1484 if (!RewriteBytecodes) {
1485 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1486 }
1487 }
1489 // Aggressive optimization flags -XX:+AggressiveOpts
1490 void Arguments::set_aggressive_opts_flags() {
1491 #ifdef COMPILER2
1492 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1493 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1494 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1495 }
1496 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1497 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1498 }
1500 // Feed the cache size setting into the JDK
1501 char buffer[1024];
1502 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1503 add_property(buffer);
1504 }
1505 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1506 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1507 }
1508 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1509 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1510 }
1511 #endif
1513 if (AggressiveOpts) {
1514 // Sample flag setting code
1515 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1516 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1517 // }
1518 }
1519 }
1521 //===========================================================================================================
1522 // Parsing of java.compiler property
1524 void Arguments::process_java_compiler_argument(char* arg) {
1525 // For backwards compatibility, Djava.compiler=NONE or ""
1526 // causes us to switch to -Xint mode UNLESS -Xdebug
1527 // is also specified.
1528 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1529 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1530 }
1531 }
1533 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1534 _sun_java_launcher = strdup(launcher);
1535 }
1537 bool Arguments::created_by_java_launcher() {
1538 assert(_sun_java_launcher != NULL, "property must have value");
1539 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1540 }
1542 //===========================================================================================================
1543 // Parsing of main arguments
1545 bool Arguments::verify_interval(uintx val, uintx min,
1546 uintx max, const char* name) {
1547 // Returns true iff value is in the inclusive interval [min..max]
1548 // false, otherwise.
1549 if (val >= min && val <= max) {
1550 return true;
1551 }
1552 jio_fprintf(defaultStream::error_stream(),
1553 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1554 " and " UINTX_FORMAT "\n",
1555 name, val, min, max);
1556 return false;
1557 }
1559 bool Arguments::verify_percentage(uintx value, const char* name) {
1560 if (value <= 100) {
1561 return true;
1562 }
1563 jio_fprintf(defaultStream::error_stream(),
1564 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1565 name, value);
1566 return false;
1567 }
1569 static void force_serial_gc() {
1570 FLAG_SET_DEFAULT(UseSerialGC, true);
1571 FLAG_SET_DEFAULT(UseParNewGC, false);
1572 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1573 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1574 FLAG_SET_DEFAULT(UseParallelGC, false);
1575 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1576 FLAG_SET_DEFAULT(UseG1GC, false);
1577 }
1579 static bool verify_serial_gc_flags() {
1580 return (UseSerialGC &&
1581 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1582 UseParallelGC || UseParallelOldGC));
1583 }
1585 // Check consistency of GC selection
1586 bool Arguments::check_gc_consistency() {
1587 bool status = true;
1588 // Ensure that the user has not selected conflicting sets
1589 // of collectors. [Note: this check is merely a user convenience;
1590 // collectors over-ride each other so that only a non-conflicting
1591 // set is selected; however what the user gets is not what they
1592 // may have expected from the combination they asked for. It's
1593 // better to reduce user confusion by not allowing them to
1594 // select conflicting combinations.
1595 uint i = 0;
1596 if (UseSerialGC) i++;
1597 if (UseConcMarkSweepGC || UseParNewGC) i++;
1598 if (UseParallelGC || UseParallelOldGC) i++;
1599 if (UseG1GC) i++;
1600 if (i > 1) {
1601 jio_fprintf(defaultStream::error_stream(),
1602 "Conflicting collector combinations in option list; "
1603 "please refer to the release notes for the combinations "
1604 "allowed\n");
1605 status = false;
1606 }
1608 return status;
1609 }
1611 // Check the consistency of vm_init_args
1612 bool Arguments::check_vm_args_consistency() {
1613 // Method for adding checks for flag consistency.
1614 // The intent is to warn the user of all possible conflicts,
1615 // before returning an error.
1616 // Note: Needs platform-dependent factoring.
1617 bool status = true;
1619 #if ( (defined(COMPILER2) && defined(SPARC)))
1620 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1621 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1622 // x86. Normally, VM_Version_init must be called from init_globals in
1623 // init.cpp, which is called by the initial java thread *after* arguments
1624 // have been parsed. VM_Version_init gets called twice on sparc.
1625 extern void VM_Version_init();
1626 VM_Version_init();
1627 if (!VM_Version::has_v9()) {
1628 jio_fprintf(defaultStream::error_stream(),
1629 "V8 Machine detected, Server requires V9\n");
1630 status = false;
1631 }
1632 #endif /* COMPILER2 && SPARC */
1634 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1635 // builds so the cost of stack banging can be measured.
1636 #if (defined(PRODUCT) && defined(SOLARIS))
1637 if (!UseBoundThreads && !UseStackBanging) {
1638 jio_fprintf(defaultStream::error_stream(),
1639 "-UseStackBanging conflicts with -UseBoundThreads\n");
1641 status = false;
1642 }
1643 #endif
1645 if (TLABRefillWasteFraction == 0) {
1646 jio_fprintf(defaultStream::error_stream(),
1647 "TLABRefillWasteFraction should be a denominator, "
1648 "not " SIZE_FORMAT "\n",
1649 TLABRefillWasteFraction);
1650 status = false;
1651 }
1653 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1654 "MaxLiveObjectEvacuationRatio");
1655 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1656 "AdaptiveSizePolicyWeight");
1657 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1658 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1659 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1660 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1662 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1663 jio_fprintf(defaultStream::error_stream(),
1664 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1665 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1666 MinHeapFreeRatio, MaxHeapFreeRatio);
1667 status = false;
1668 }
1669 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1670 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1672 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1673 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1674 }
1676 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1677 // Settings to encourage splitting.
1678 if (!FLAG_IS_CMDLINE(NewRatio)) {
1679 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1680 }
1681 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1682 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1683 }
1684 }
1686 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1687 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1688 if (GCTimeLimit == 100) {
1689 // Turn off gc-overhead-limit-exceeded checks
1690 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1691 }
1693 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1695 // Check user specified sharing option conflict with Parallel GC
1696 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC ||
1697 UseParallelGC || UseParallelOldGC ||
1698 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1700 if (cannot_share) {
1701 // Either force sharing on by forcing the other options off, or
1702 // force sharing off.
1703 if (DumpSharedSpaces || ForceSharedSpaces) {
1704 jio_fprintf(defaultStream::error_stream(),
1705 "Reverting to Serial GC because of %s\n",
1706 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump");
1707 force_serial_gc();
1708 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1709 } else {
1710 if (UseSharedSpaces && Verbose) {
1711 jio_fprintf(defaultStream::error_stream(),
1712 "Turning off use of shared archive because of "
1713 "choice of garbage collector or large pages\n");
1714 }
1715 no_shared_spaces();
1716 }
1717 }
1719 status = status && check_gc_consistency();
1721 if (_has_alloc_profile) {
1722 if (UseParallelGC || UseParallelOldGC) {
1723 jio_fprintf(defaultStream::error_stream(),
1724 "error: invalid argument combination.\n"
1725 "Allocation profiling (-Xaprof) cannot be used together with "
1726 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1727 status = false;
1728 }
1729 if (UseConcMarkSweepGC) {
1730 jio_fprintf(defaultStream::error_stream(),
1731 "error: invalid argument combination.\n"
1732 "Allocation profiling (-Xaprof) cannot be used together with "
1733 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1734 status = false;
1735 }
1736 }
1738 if (CMSIncrementalMode) {
1739 if (!UseConcMarkSweepGC) {
1740 jio_fprintf(defaultStream::error_stream(),
1741 "error: invalid argument combination.\n"
1742 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1743 "selected in order\nto use CMSIncrementalMode.\n");
1744 status = false;
1745 } else {
1746 status = status && verify_percentage(CMSIncrementalDutyCycle,
1747 "CMSIncrementalDutyCycle");
1748 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1749 "CMSIncrementalDutyCycleMin");
1750 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1751 "CMSIncrementalSafetyFactor");
1752 status = status && verify_percentage(CMSIncrementalOffset,
1753 "CMSIncrementalOffset");
1754 status = status && verify_percentage(CMSExpAvgFactor,
1755 "CMSExpAvgFactor");
1756 // If it was not set on the command line, set
1757 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1758 if (CMSInitiatingOccupancyFraction < 0) {
1759 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1760 }
1761 }
1762 }
1764 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1765 // insists that we hold the requisite locks so that the iteration is
1766 // MT-safe. For the verification at start-up and shut-down, we don't
1767 // yet have a good way of acquiring and releasing these locks,
1768 // which are not visible at the CollectedHeap level. We want to
1769 // be able to acquire these locks and then do the iteration rather
1770 // than just disable the lock verification. This will be fixed under
1771 // bug 4788986.
1772 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1773 if (VerifyGCStartAt == 0) {
1774 warning("Heap verification at start-up disabled "
1775 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1776 VerifyGCStartAt = 1; // Disable verification at start-up
1777 }
1778 if (VerifyBeforeExit) {
1779 warning("Heap verification at shutdown disabled "
1780 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1781 VerifyBeforeExit = false; // Disable verification at shutdown
1782 }
1783 }
1785 // Note: only executed in non-PRODUCT mode
1786 if (!UseAsyncConcMarkSweepGC &&
1787 (ExplicitGCInvokesConcurrent ||
1788 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1789 jio_fprintf(defaultStream::error_stream(),
1790 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1791 " with -UseAsyncConcMarkSweepGC");
1792 status = false;
1793 }
1795 if (UseG1GC) {
1796 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1797 "InitiatingHeapOccupancyPercent");
1798 }
1800 status = status && verify_interval(RefDiscoveryPolicy,
1801 ReferenceProcessor::DiscoveryPolicyMin,
1802 ReferenceProcessor::DiscoveryPolicyMax,
1803 "RefDiscoveryPolicy");
1805 // Limit the lower bound of this flag to 1 as it is used in a division
1806 // expression.
1807 status = status && verify_interval(TLABWasteTargetPercent,
1808 1, 100, "TLABWasteTargetPercent");
1810 status = status && verify_object_alignment();
1812 return status;
1813 }
1815 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1816 const char* option_type) {
1817 if (ignore) return false;
1819 const char* spacer = " ";
1820 if (option_type == NULL) {
1821 option_type = ++spacer; // Set both to the empty string.
1822 }
1824 if (os::obsolete_option(option)) {
1825 jio_fprintf(defaultStream::error_stream(),
1826 "Obsolete %s%soption: %s\n", option_type, spacer,
1827 option->optionString);
1828 return false;
1829 } else {
1830 jio_fprintf(defaultStream::error_stream(),
1831 "Unrecognized %s%soption: %s\n", option_type, spacer,
1832 option->optionString);
1833 return true;
1834 }
1835 }
1837 static const char* user_assertion_options[] = {
1838 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1839 };
1841 static const char* system_assertion_options[] = {
1842 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1843 };
1845 // Return true if any of the strings in null-terminated array 'names' matches.
1846 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1847 // the option must match exactly.
1848 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1849 bool tail_allowed) {
1850 for (/* empty */; *names != NULL; ++names) {
1851 if (match_option(option, *names, tail)) {
1852 if (**tail == '\0' || tail_allowed && **tail == ':') {
1853 return true;
1854 }
1855 }
1856 }
1857 return false;
1858 }
1860 bool Arguments::parse_uintx(const char* value,
1861 uintx* uintx_arg,
1862 uintx min_size) {
1864 // Check the sign first since atomull() parses only unsigned values.
1865 bool value_is_positive = !(*value == '-');
1867 if (value_is_positive) {
1868 julong n;
1869 bool good_return = atomull(value, &n);
1870 if (good_return) {
1871 bool above_minimum = n >= min_size;
1872 bool value_is_too_large = n > max_uintx;
1874 if (above_minimum && !value_is_too_large) {
1875 *uintx_arg = n;
1876 return true;
1877 }
1878 }
1879 }
1880 return false;
1881 }
1883 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1884 julong* long_arg,
1885 julong min_size) {
1886 if (!atomull(s, long_arg)) return arg_unreadable;
1887 return check_memory_size(*long_arg, min_size);
1888 }
1890 // Parse JavaVMInitArgs structure
1892 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1893 // For components of the system classpath.
1894 SysClassPath scp(Arguments::get_sysclasspath());
1895 bool scp_assembly_required = false;
1897 // Save default settings for some mode flags
1898 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1899 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1900 Arguments::_ClipInlining = ClipInlining;
1901 Arguments::_BackgroundCompilation = BackgroundCompilation;
1902 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1904 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1905 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1906 if (result != JNI_OK) {
1907 return result;
1908 }
1910 // Parse JavaVMInitArgs structure passed in
1911 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1912 if (result != JNI_OK) {
1913 return result;
1914 }
1916 if (AggressiveOpts) {
1917 // Insert alt-rt.jar between user-specified bootclasspath
1918 // prefix and the default bootclasspath. os::set_boot_path()
1919 // uses meta_index_dir as the default bootclasspath directory.
1920 const char* altclasses_jar = "alt-rt.jar";
1921 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1922 strlen(altclasses_jar);
1923 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1924 strcpy(altclasses_path, get_meta_index_dir());
1925 strcat(altclasses_path, altclasses_jar);
1926 scp.add_suffix_to_prefix(altclasses_path);
1927 scp_assembly_required = true;
1928 FREE_C_HEAP_ARRAY(char, altclasses_path);
1929 }
1931 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1932 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1933 if (result != JNI_OK) {
1934 return result;
1935 }
1937 // Do final processing now that all arguments have been parsed
1938 result = finalize_vm_init_args(&scp, scp_assembly_required);
1939 if (result != JNI_OK) {
1940 return result;
1941 }
1943 return JNI_OK;
1944 }
1946 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1947 SysClassPath* scp_p,
1948 bool* scp_assembly_required_p,
1949 FlagValueOrigin origin) {
1950 // Remaining part of option string
1951 const char* tail;
1953 // iterate over arguments
1954 for (int index = 0; index < args->nOptions; index++) {
1955 bool is_absolute_path = false; // for -agentpath vs -agentlib
1957 const JavaVMOption* option = args->options + index;
1959 if (!match_option(option, "-Djava.class.path", &tail) &&
1960 !match_option(option, "-Dsun.java.command", &tail) &&
1961 !match_option(option, "-Dsun.java.launcher", &tail)) {
1963 // add all jvm options to the jvm_args string. This string
1964 // is used later to set the java.vm.args PerfData string constant.
1965 // the -Djava.class.path and the -Dsun.java.command options are
1966 // omitted from jvm_args string as each have their own PerfData
1967 // string constant object.
1968 build_jvm_args(option->optionString);
1969 }
1971 // -verbose:[class/gc/jni]
1972 if (match_option(option, "-verbose", &tail)) {
1973 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1974 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1975 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1976 } else if (!strcmp(tail, ":gc")) {
1977 FLAG_SET_CMDLINE(bool, PrintGC, true);
1978 } else if (!strcmp(tail, ":jni")) {
1979 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1980 }
1981 // -da / -ea / -disableassertions / -enableassertions
1982 // These accept an optional class/package name separated by a colon, e.g.,
1983 // -da:java.lang.Thread.
1984 } else if (match_option(option, user_assertion_options, &tail, true)) {
1985 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1986 if (*tail == '\0') {
1987 JavaAssertions::setUserClassDefault(enable);
1988 } else {
1989 assert(*tail == ':', "bogus match by match_option()");
1990 JavaAssertions::addOption(tail + 1, enable);
1991 }
1992 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1993 } else if (match_option(option, system_assertion_options, &tail, false)) {
1994 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1995 JavaAssertions::setSystemClassDefault(enable);
1996 // -bootclasspath:
1997 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1998 scp_p->reset_path(tail);
1999 *scp_assembly_required_p = true;
2000 // -bootclasspath/a:
2001 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2002 scp_p->add_suffix(tail);
2003 *scp_assembly_required_p = true;
2004 // -bootclasspath/p:
2005 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2006 scp_p->add_prefix(tail);
2007 *scp_assembly_required_p = true;
2008 // -Xrun
2009 } else if (match_option(option, "-Xrun", &tail)) {
2010 if (tail != NULL) {
2011 const char* pos = strchr(tail, ':');
2012 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2013 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2014 name[len] = '\0';
2016 char *options = NULL;
2017 if(pos != NULL) {
2018 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2019 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2020 }
2021 #ifdef JVMTI_KERNEL
2022 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2023 warning("profiling and debugging agents are not supported with Kernel VM");
2024 } else
2025 #endif // JVMTI_KERNEL
2026 add_init_library(name, options);
2027 }
2028 // -agentlib and -agentpath
2029 } else if (match_option(option, "-agentlib:", &tail) ||
2030 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2031 if(tail != NULL) {
2032 const char* pos = strchr(tail, '=');
2033 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2034 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2035 name[len] = '\0';
2037 char *options = NULL;
2038 if(pos != NULL) {
2039 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2040 }
2041 #ifdef JVMTI_KERNEL
2042 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2043 warning("profiling and debugging agents are not supported with Kernel VM");
2044 } else
2045 #endif // JVMTI_KERNEL
2046 add_init_agent(name, options, is_absolute_path);
2048 }
2049 // -javaagent
2050 } else if (match_option(option, "-javaagent:", &tail)) {
2051 if(tail != NULL) {
2052 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2053 add_init_agent("instrument", options, false);
2054 }
2055 // -Xnoclassgc
2056 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2057 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2058 // -Xincgc: i-CMS
2059 } else if (match_option(option, "-Xincgc", &tail)) {
2060 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2061 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2062 // -Xnoincgc: no i-CMS
2063 } else if (match_option(option, "-Xnoincgc", &tail)) {
2064 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2065 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2066 // -Xconcgc
2067 } else if (match_option(option, "-Xconcgc", &tail)) {
2068 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2069 // -Xnoconcgc
2070 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2071 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2072 // -Xbatch
2073 } else if (match_option(option, "-Xbatch", &tail)) {
2074 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2075 // -Xmn for compatibility with other JVM vendors
2076 } else if (match_option(option, "-Xmn", &tail)) {
2077 julong long_initial_eden_size = 0;
2078 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2079 if (errcode != arg_in_range) {
2080 jio_fprintf(defaultStream::error_stream(),
2081 "Invalid initial eden size: %s\n", option->optionString);
2082 describe_range_error(errcode);
2083 return JNI_EINVAL;
2084 }
2085 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2086 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2087 // -Xms
2088 } else if (match_option(option, "-Xms", &tail)) {
2089 julong long_initial_heap_size = 0;
2090 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2091 if (errcode != arg_in_range) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "Invalid initial heap size: %s\n", option->optionString);
2094 describe_range_error(errcode);
2095 return JNI_EINVAL;
2096 }
2097 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2098 // Currently the minimum size and the initial heap sizes are the same.
2099 set_min_heap_size(InitialHeapSize);
2100 // -Xmx
2101 } else if (match_option(option, "-Xmx", &tail)) {
2102 julong long_max_heap_size = 0;
2103 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2104 if (errcode != arg_in_range) {
2105 jio_fprintf(defaultStream::error_stream(),
2106 "Invalid maximum heap size: %s\n", option->optionString);
2107 describe_range_error(errcode);
2108 return JNI_EINVAL;
2109 }
2110 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2111 // Xmaxf
2112 } else if (match_option(option, "-Xmaxf", &tail)) {
2113 int maxf = (int)(atof(tail) * 100);
2114 if (maxf < 0 || maxf > 100) {
2115 jio_fprintf(defaultStream::error_stream(),
2116 "Bad max heap free percentage size: %s\n",
2117 option->optionString);
2118 return JNI_EINVAL;
2119 } else {
2120 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2121 }
2122 // Xminf
2123 } else if (match_option(option, "-Xminf", &tail)) {
2124 int minf = (int)(atof(tail) * 100);
2125 if (minf < 0 || minf > 100) {
2126 jio_fprintf(defaultStream::error_stream(),
2127 "Bad min heap free percentage size: %s\n",
2128 option->optionString);
2129 return JNI_EINVAL;
2130 } else {
2131 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2132 }
2133 // -Xss
2134 } else if (match_option(option, "-Xss", &tail)) {
2135 julong long_ThreadStackSize = 0;
2136 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2137 if (errcode != arg_in_range) {
2138 jio_fprintf(defaultStream::error_stream(),
2139 "Invalid thread stack size: %s\n", option->optionString);
2140 describe_range_error(errcode);
2141 return JNI_EINVAL;
2142 }
2143 // Internally track ThreadStackSize in units of 1024 bytes.
2144 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2145 round_to((int)long_ThreadStackSize, K) / K);
2146 // -Xoss
2147 } else if (match_option(option, "-Xoss", &tail)) {
2148 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2149 // -Xmaxjitcodesize
2150 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2151 julong long_ReservedCodeCacheSize = 0;
2152 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2153 (size_t)InitialCodeCacheSize);
2154 if (errcode != arg_in_range) {
2155 jio_fprintf(defaultStream::error_stream(),
2156 "Invalid maximum code cache size: %s\n",
2157 option->optionString);
2158 describe_range_error(errcode);
2159 return JNI_EINVAL;
2160 }
2161 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2162 // -green
2163 } else if (match_option(option, "-green", &tail)) {
2164 jio_fprintf(defaultStream::error_stream(),
2165 "Green threads support not available\n");
2166 return JNI_EINVAL;
2167 // -native
2168 } else if (match_option(option, "-native", &tail)) {
2169 // HotSpot always uses native threads, ignore silently for compatibility
2170 // -Xsqnopause
2171 } else if (match_option(option, "-Xsqnopause", &tail)) {
2172 // EVM option, ignore silently for compatibility
2173 // -Xrs
2174 } else if (match_option(option, "-Xrs", &tail)) {
2175 // Classic/EVM option, new functionality
2176 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2177 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2178 // change default internal VM signals used - lower case for back compat
2179 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2180 // -Xoptimize
2181 } else if (match_option(option, "-Xoptimize", &tail)) {
2182 // EVM option, ignore silently for compatibility
2183 // -Xprof
2184 } else if (match_option(option, "-Xprof", &tail)) {
2185 #ifndef FPROF_KERNEL
2186 _has_profile = true;
2187 #else // FPROF_KERNEL
2188 // do we have to exit?
2189 warning("Kernel VM does not support flat profiling.");
2190 #endif // FPROF_KERNEL
2191 // -Xaprof
2192 } else if (match_option(option, "-Xaprof", &tail)) {
2193 _has_alloc_profile = true;
2194 // -Xconcurrentio
2195 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2196 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2197 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2198 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2199 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2200 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2202 // -Xinternalversion
2203 } else if (match_option(option, "-Xinternalversion", &tail)) {
2204 jio_fprintf(defaultStream::output_stream(), "%s\n",
2205 VM_Version::internal_vm_info_string());
2206 vm_exit(0);
2207 #ifndef PRODUCT
2208 // -Xprintflags
2209 } else if (match_option(option, "-Xprintflags", &tail)) {
2210 CommandLineFlags::printFlags();
2211 vm_exit(0);
2212 #endif
2213 // -D
2214 } else if (match_option(option, "-D", &tail)) {
2215 if (!add_property(tail)) {
2216 return JNI_ENOMEM;
2217 }
2218 // Out of the box management support
2219 if (match_option(option, "-Dcom.sun.management", &tail)) {
2220 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2221 }
2222 // -Xint
2223 } else if (match_option(option, "-Xint", &tail)) {
2224 set_mode_flags(_int);
2225 // -Xmixed
2226 } else if (match_option(option, "-Xmixed", &tail)) {
2227 set_mode_flags(_mixed);
2228 // -Xcomp
2229 } else if (match_option(option, "-Xcomp", &tail)) {
2230 // for testing the compiler; turn off all flags that inhibit compilation
2231 set_mode_flags(_comp);
2233 // -Xshare:dump
2234 } else if (match_option(option, "-Xshare:dump", &tail)) {
2235 #ifdef TIERED
2236 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2237 set_mode_flags(_int); // Prevent compilation, which creates objects
2238 #elif defined(COMPILER2)
2239 vm_exit_during_initialization(
2240 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2241 #elif defined(KERNEL)
2242 vm_exit_during_initialization(
2243 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2244 #else
2245 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2246 set_mode_flags(_int); // Prevent compilation, which creates objects
2247 #endif
2248 // -Xshare:on
2249 } else if (match_option(option, "-Xshare:on", &tail)) {
2250 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2251 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2252 #ifdef TIERED
2253 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2254 #endif // TIERED
2255 // -Xshare:auto
2256 } else if (match_option(option, "-Xshare:auto", &tail)) {
2257 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2258 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2259 // -Xshare:off
2260 } else if (match_option(option, "-Xshare:off", &tail)) {
2261 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2262 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2264 // -Xverify
2265 } else if (match_option(option, "-Xverify", &tail)) {
2266 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2267 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2268 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2269 } else if (strcmp(tail, ":remote") == 0) {
2270 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2271 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2272 } else if (strcmp(tail, ":none") == 0) {
2273 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2274 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2275 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2276 return JNI_EINVAL;
2277 }
2278 // -Xdebug
2279 } else if (match_option(option, "-Xdebug", &tail)) {
2280 // note this flag has been used, then ignore
2281 set_xdebug_mode(true);
2282 // -Xnoagent
2283 } else if (match_option(option, "-Xnoagent", &tail)) {
2284 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2285 } else if (match_option(option, "-Xboundthreads", &tail)) {
2286 // Bind user level threads to kernel threads (Solaris only)
2287 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2288 } else if (match_option(option, "-Xloggc:", &tail)) {
2289 // Redirect GC output to the file. -Xloggc:<filename>
2290 // ostream_init_log(), when called will use this filename
2291 // to initialize a fileStream.
2292 _gc_log_filename = strdup(tail);
2293 FLAG_SET_CMDLINE(bool, PrintGC, true);
2294 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2295 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2297 // JNI hooks
2298 } else if (match_option(option, "-Xcheck", &tail)) {
2299 if (!strcmp(tail, ":jni")) {
2300 CheckJNICalls = true;
2301 } else if (is_bad_option(option, args->ignoreUnrecognized,
2302 "check")) {
2303 return JNI_EINVAL;
2304 }
2305 } else if (match_option(option, "vfprintf", &tail)) {
2306 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2307 } else if (match_option(option, "exit", &tail)) {
2308 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2309 } else if (match_option(option, "abort", &tail)) {
2310 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2311 // -XX:+AggressiveHeap
2312 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2314 // This option inspects the machine and attempts to set various
2315 // parameters to be optimal for long-running, memory allocation
2316 // intensive jobs. It is intended for machines with large
2317 // amounts of cpu and memory.
2319 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2320 // VM, but we may not be able to represent the total physical memory
2321 // available (like having 8gb of memory on a box but using a 32bit VM).
2322 // Thus, we need to make sure we're using a julong for intermediate
2323 // calculations.
2324 julong initHeapSize;
2325 julong total_memory = os::physical_memory();
2327 if (total_memory < (julong)256*M) {
2328 jio_fprintf(defaultStream::error_stream(),
2329 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2330 vm_exit(1);
2331 }
2333 // The heap size is half of available memory, or (at most)
2334 // all of possible memory less 160mb (leaving room for the OS
2335 // when using ISM). This is the maximum; because adaptive sizing
2336 // is turned on below, the actual space used may be smaller.
2338 initHeapSize = MIN2(total_memory / (julong)2,
2339 total_memory - (julong)160*M);
2341 // Make sure that if we have a lot of memory we cap the 32 bit
2342 // process space. The 64bit VM version of this function is a nop.
2343 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2345 // The perm gen is separate but contiguous with the
2346 // object heap (and is reserved with it) so subtract it
2347 // from the heap size.
2348 if (initHeapSize > MaxPermSize) {
2349 initHeapSize = initHeapSize - MaxPermSize;
2350 } else {
2351 warning("AggressiveHeap and MaxPermSize values may conflict");
2352 }
2354 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2355 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2356 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2357 // Currently the minimum size and the initial heap sizes are the same.
2358 set_min_heap_size(initHeapSize);
2359 }
2360 if (FLAG_IS_DEFAULT(NewSize)) {
2361 // Make the young generation 3/8ths of the total heap.
2362 FLAG_SET_CMDLINE(uintx, NewSize,
2363 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2364 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2365 }
2367 FLAG_SET_DEFAULT(UseLargePages, true);
2369 // Increase some data structure sizes for efficiency
2370 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2371 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2372 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2374 // See the OldPLABSize comment below, but replace 'after promotion'
2375 // with 'after copying'. YoungPLABSize is the size of the survivor
2376 // space per-gc-thread buffers. The default is 4kw.
2377 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2379 // OldPLABSize is the size of the buffers in the old gen that
2380 // UseParallelGC uses to promote live data that doesn't fit in the
2381 // survivor spaces. At any given time, there's one for each gc thread.
2382 // The default size is 1kw. These buffers are rarely used, since the
2383 // survivor spaces are usually big enough. For specjbb, however, there
2384 // are occasions when there's lots of live data in the young gen
2385 // and we end up promoting some of it. We don't have a definite
2386 // explanation for why bumping OldPLABSize helps, but the theory
2387 // is that a bigger PLAB results in retaining something like the
2388 // original allocation order after promotion, which improves mutator
2389 // locality. A minor effect may be that larger PLABs reduce the
2390 // number of PLAB allocation events during gc. The value of 8kw
2391 // was arrived at by experimenting with specjbb.
2392 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2394 // CompilationPolicyChoice=0 causes the server compiler to adopt
2395 // a more conservative which-method-do-I-compile policy when one
2396 // of the counters maintained by the interpreter trips. The
2397 // result is reduced startup time and improved specjbb and
2398 // alacrity performance. Zero is the default, but we set it
2399 // explicitly here in case the default changes.
2400 // See runtime/compilationPolicy.*.
2401 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2403 // Enable parallel GC and adaptive generation sizing
2404 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2405 FLAG_SET_DEFAULT(ParallelGCThreads,
2406 Abstract_VM_Version::parallel_worker_threads());
2408 // Encourage steady state memory management
2409 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2411 // This appears to improve mutator locality
2412 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2414 // Get around early Solaris scheduling bug
2415 // (affinity vs other jobs on system)
2416 // but disallow DR and offlining (5008695).
2417 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2419 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2420 // The last option must always win.
2421 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2422 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2423 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2424 // The last option must always win.
2425 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2426 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2427 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2428 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Please use CMSClassUnloadingEnabled in place of "
2431 "CMSPermGenSweepingEnabled in the future\n");
2432 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2433 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Please use -XX:+UseGCOverheadLimit in place of "
2436 "-XX:+UseGCTimeLimit in the future\n");
2437 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2438 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Please use -XX:-UseGCOverheadLimit in place of "
2441 "-XX:-UseGCTimeLimit in the future\n");
2442 // The TLE options are for compatibility with 1.3 and will be
2443 // removed without notice in a future release. These options
2444 // are not to be documented.
2445 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2446 // No longer used.
2447 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2448 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2449 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2450 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2451 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2452 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2453 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2454 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2455 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2456 // No longer used.
2457 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2458 julong long_tlab_size = 0;
2459 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2460 if (errcode != arg_in_range) {
2461 jio_fprintf(defaultStream::error_stream(),
2462 "Invalid TLAB size: %s\n", option->optionString);
2463 describe_range_error(errcode);
2464 return JNI_EINVAL;
2465 }
2466 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2467 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2468 // No longer used.
2469 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2470 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2471 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2472 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2473 SOLARIS_ONLY(
2474 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2475 warning("-XX:+UsePermISM is obsolete.");
2476 FLAG_SET_CMDLINE(bool, UseISM, true);
2477 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2478 FLAG_SET_CMDLINE(bool, UseISM, false);
2479 )
2480 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2481 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2482 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2483 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2484 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2485 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2486 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2487 #ifdef SOLARIS
2488 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2489 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2490 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2491 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2492 #else // ndef SOLARIS
2493 jio_fprintf(defaultStream::error_stream(),
2494 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2495 return JNI_EINVAL;
2496 #endif // ndef SOLARIS
2497 #ifdef ASSERT
2498 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2499 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2500 // disable scavenge before parallel mark-compact
2501 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2502 #endif
2503 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2504 julong cms_blocks_to_claim = (julong)atol(tail);
2505 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Please use -XX:OldPLABSize in place of "
2508 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2509 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2510 julong cms_blocks_to_claim = (julong)atol(tail);
2511 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2512 jio_fprintf(defaultStream::error_stream(),
2513 "Please use -XX:OldPLABSize in place of "
2514 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2515 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2516 julong old_plab_size = 0;
2517 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2518 if (errcode != arg_in_range) {
2519 jio_fprintf(defaultStream::error_stream(),
2520 "Invalid old PLAB size: %s\n", option->optionString);
2521 describe_range_error(errcode);
2522 return JNI_EINVAL;
2523 }
2524 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2525 jio_fprintf(defaultStream::error_stream(),
2526 "Please use -XX:OldPLABSize in place of "
2527 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2528 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2529 julong young_plab_size = 0;
2530 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2531 if (errcode != arg_in_range) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Invalid young PLAB size: %s\n", option->optionString);
2534 describe_range_error(errcode);
2535 return JNI_EINVAL;
2536 }
2537 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2538 jio_fprintf(defaultStream::error_stream(),
2539 "Please use -XX:YoungPLABSize in place of "
2540 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2541 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2542 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2543 julong stack_size = 0;
2544 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2545 if (errcode != arg_in_range) {
2546 jio_fprintf(defaultStream::error_stream(),
2547 "Invalid mark stack size: %s\n", option->optionString);
2548 describe_range_error(errcode);
2549 return JNI_EINVAL;
2550 }
2551 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2552 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2553 julong max_stack_size = 0;
2554 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2555 if (errcode != arg_in_range) {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Invalid maximum mark stack size: %s\n",
2558 option->optionString);
2559 describe_range_error(errcode);
2560 return JNI_EINVAL;
2561 }
2562 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2563 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2564 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2565 uintx conc_threads = 0;
2566 if (!parse_uintx(tail, &conc_threads, 1)) {
2567 jio_fprintf(defaultStream::error_stream(),
2568 "Invalid concurrent threads: %s\n", option->optionString);
2569 return JNI_EINVAL;
2570 }
2571 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2572 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2573 // Skip -XX:Flags= since that case has already been handled
2574 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2575 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2576 return JNI_EINVAL;
2577 }
2578 }
2579 // Unknown option
2580 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2581 return JNI_ERR;
2582 }
2583 }
2584 // Change the default value for flags which have different default values
2585 // when working with older JDKs.
2586 if (JDK_Version::current().compare_major(6) <= 0 &&
2587 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2588 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2589 }
2590 return JNI_OK;
2591 }
2593 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2594 // This must be done after all -D arguments have been processed.
2595 scp_p->expand_endorsed();
2597 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2598 // Assemble the bootclasspath elements into the final path.
2599 Arguments::set_sysclasspath(scp_p->combined_path());
2600 }
2602 // This must be done after all arguments have been processed.
2603 // java_compiler() true means set to "NONE" or empty.
2604 if (java_compiler() && !xdebug_mode()) {
2605 // For backwards compatibility, we switch to interpreted mode if
2606 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2607 // not specified.
2608 set_mode_flags(_int);
2609 }
2610 if (CompileThreshold == 0) {
2611 set_mode_flags(_int);
2612 }
2614 #ifdef TIERED
2615 // If we are using tiered compilation in the tiered vm then c1 will
2616 // do the profiling and we don't want to waste that time in the
2617 // interpreter.
2618 if (TieredCompilation) {
2619 ProfileInterpreter = false;
2620 } else {
2621 // Since we are running vanilla server we must adjust the compile threshold
2622 // unless the user has already adjusted it because the default threshold assumes
2623 // we will run tiered.
2625 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2626 CompileThreshold = Tier2CompileThreshold;
2627 }
2628 }
2629 #endif // TIERED
2631 #ifndef COMPILER2
2632 // Don't degrade server performance for footprint
2633 if (FLAG_IS_DEFAULT(UseLargePages) &&
2634 MaxHeapSize < LargePageHeapSizeThreshold) {
2635 // No need for large granularity pages w/small heaps.
2636 // Note that large pages are enabled/disabled for both the
2637 // Java heap and the code cache.
2638 FLAG_SET_DEFAULT(UseLargePages, false);
2639 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2640 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2641 }
2643 // Tiered compilation is undefined with C1.
2644 TieredCompilation = false;
2646 #else
2647 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2648 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2649 }
2650 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2651 if (UseG1GC) {
2652 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2653 }
2654 #endif
2656 if (!check_vm_args_consistency()) {
2657 return JNI_ERR;
2658 }
2660 return JNI_OK;
2661 }
2663 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2664 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2665 scp_assembly_required_p);
2666 }
2668 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2669 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2670 scp_assembly_required_p);
2671 }
2673 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2674 const int N_MAX_OPTIONS = 64;
2675 const int OPTION_BUFFER_SIZE = 1024;
2676 char buffer[OPTION_BUFFER_SIZE];
2678 // The variable will be ignored if it exceeds the length of the buffer.
2679 // Don't check this variable if user has special privileges
2680 // (e.g. unix su command).
2681 if (os::getenv(name, buffer, sizeof(buffer)) &&
2682 !os::have_special_privileges()) {
2683 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Picked up %s: %s\n", name, buffer);
2686 char* rd = buffer; // pointer to the input string (rd)
2687 int i;
2688 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2689 while (isspace(*rd)) rd++; // skip whitespace
2690 if (*rd == 0) break; // we re done when the input string is read completely
2692 // The output, option string, overwrites the input string.
2693 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2694 // input string (rd).
2695 char* wrt = rd;
2697 options[i++].optionString = wrt; // Fill in option
2698 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2699 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2700 int quote = *rd; // matching quote to look for
2701 rd++; // don't copy open quote
2702 while (*rd != quote) { // include everything (even spaces) up until quote
2703 if (*rd == 0) { // string termination means unmatched string
2704 jio_fprintf(defaultStream::error_stream(),
2705 "Unmatched quote in %s\n", name);
2706 return JNI_ERR;
2707 }
2708 *wrt++ = *rd++; // copy to option string
2709 }
2710 rd++; // don't copy close quote
2711 } else {
2712 *wrt++ = *rd++; // copy to option string
2713 }
2714 }
2715 // Need to check if we're done before writing a NULL,
2716 // because the write could be to the byte that rd is pointing to.
2717 if (*rd++ == 0) {
2718 *wrt = 0;
2719 break;
2720 }
2721 *wrt = 0; // Zero terminate option
2722 }
2723 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2724 JavaVMInitArgs vm_args;
2725 vm_args.version = JNI_VERSION_1_2;
2726 vm_args.options = options;
2727 vm_args.nOptions = i;
2728 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2730 if (PrintVMOptions) {
2731 const char* tail;
2732 for (int i = 0; i < vm_args.nOptions; i++) {
2733 const JavaVMOption *option = vm_args.options + i;
2734 if (match_option(option, "-XX:", &tail)) {
2735 logOption(tail);
2736 }
2737 }
2738 }
2740 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2741 }
2742 return JNI_OK;
2743 }
2745 // Parse entry point called from JNI_CreateJavaVM
2747 jint Arguments::parse(const JavaVMInitArgs* args) {
2749 // Sharing support
2750 // Construct the path to the archive
2751 char jvm_path[JVM_MAXPATHLEN];
2752 os::jvm_path(jvm_path, sizeof(jvm_path));
2753 #ifdef TIERED
2754 if (strstr(jvm_path, "client") != NULL) {
2755 force_client_mode = true;
2756 }
2757 #endif // TIERED
2758 char *end = strrchr(jvm_path, *os::file_separator());
2759 if (end != NULL) *end = '\0';
2760 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2761 strlen(os::file_separator()) + 20);
2762 if (shared_archive_path == NULL) return JNI_ENOMEM;
2763 strcpy(shared_archive_path, jvm_path);
2764 strcat(shared_archive_path, os::file_separator());
2765 strcat(shared_archive_path, "classes");
2766 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2767 strcat(shared_archive_path, ".jsa");
2768 SharedArchivePath = shared_archive_path;
2770 // Remaining part of option string
2771 const char* tail;
2773 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2774 bool settings_file_specified = false;
2775 const char* flags_file;
2776 int index;
2777 for (index = 0; index < args->nOptions; index++) {
2778 const JavaVMOption *option = args->options + index;
2779 if (match_option(option, "-XX:Flags=", &tail)) {
2780 flags_file = tail;
2781 settings_file_specified = true;
2782 }
2783 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2784 PrintVMOptions = true;
2785 }
2786 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2787 PrintVMOptions = false;
2788 }
2789 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2790 IgnoreUnrecognizedVMOptions = true;
2791 }
2792 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2793 IgnoreUnrecognizedVMOptions = false;
2794 }
2795 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2796 CommandLineFlags::printFlags();
2797 vm_exit(0);
2798 }
2799 }
2801 if (IgnoreUnrecognizedVMOptions) {
2802 // uncast const to modify the flag args->ignoreUnrecognized
2803 *(jboolean*)(&args->ignoreUnrecognized) = true;
2804 }
2806 // Parse specified settings file
2807 if (settings_file_specified) {
2808 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2809 return JNI_EINVAL;
2810 }
2811 }
2813 // Parse default .hotspotrc settings file
2814 if (!settings_file_specified) {
2815 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2816 return JNI_EINVAL;
2817 }
2818 }
2820 if (PrintVMOptions) {
2821 for (index = 0; index < args->nOptions; index++) {
2822 const JavaVMOption *option = args->options + index;
2823 if (match_option(option, "-XX:", &tail)) {
2824 logOption(tail);
2825 }
2826 }
2827 }
2829 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2830 jint result = parse_vm_init_args(args);
2831 if (result != JNI_OK) {
2832 return result;
2833 }
2835 #ifndef PRODUCT
2836 if (TraceBytecodesAt != 0) {
2837 TraceBytecodes = true;
2838 }
2839 if (CountCompiledCalls) {
2840 if (UseCounterDecay) {
2841 warning("UseCounterDecay disabled because CountCalls is set");
2842 UseCounterDecay = false;
2843 }
2844 }
2845 #endif // PRODUCT
2847 if (EnableInvokeDynamic && !EnableMethodHandles) {
2848 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2849 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2850 }
2851 EnableMethodHandles = true;
2852 }
2853 if (EnableMethodHandles && !AnonymousClasses) {
2854 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2855 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2856 }
2857 AnonymousClasses = true;
2858 }
2859 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2860 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2861 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2862 }
2863 ScavengeRootsInCode = 1;
2864 }
2865 #ifdef COMPILER2
2866 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2867 // TODO: We need to find rules for invokedynamic and EA. For now,
2868 // simply disable EA by default.
2869 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2870 DoEscapeAnalysis = false;
2871 }
2872 }
2873 #endif
2875 if (PrintGCDetails) {
2876 // Turn on -verbose:gc options as well
2877 PrintGC = true;
2878 }
2880 #if defined(_LP64) && defined(COMPILER1)
2881 UseCompressedOops = false;
2882 #endif
2884 // Set object alignment values.
2885 set_object_alignment();
2887 #ifdef SERIALGC
2888 force_serial_gc();
2889 #endif // SERIALGC
2890 #ifdef KERNEL
2891 no_shared_spaces();
2892 #endif // KERNEL
2894 // Set flags based on ergonomics.
2895 set_ergonomics_flags();
2897 #ifdef _LP64
2898 // XXX JSR 292 currently does not support compressed oops.
2899 if (EnableMethodHandles && UseCompressedOops) {
2900 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2901 UseCompressedOops = false;
2902 }
2903 }
2904 #endif // _LP64
2906 // Check the GC selections again.
2907 if (!check_gc_consistency()) {
2908 return JNI_EINVAL;
2909 }
2911 #ifndef KERNEL
2912 if (UseConcMarkSweepGC) {
2913 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
2914 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2915 // are true, we don't call set_parnew_gc_flags() as well.
2916 set_cms_and_parnew_gc_flags();
2917 } else {
2918 // Set heap size based on available physical memory
2919 set_heap_size();
2920 // Set per-collector flags
2921 if (UseParallelGC || UseParallelOldGC) {
2922 set_parallel_gc_flags();
2923 } else if (UseParNewGC) {
2924 set_parnew_gc_flags();
2925 } else if (UseG1GC) {
2926 set_g1_gc_flags();
2927 }
2928 }
2929 #endif // KERNEL
2931 #ifdef SERIALGC
2932 assert(verify_serial_gc_flags(), "SerialGC unset");
2933 #endif // SERIALGC
2935 // Set bytecode rewriting flags
2936 set_bytecode_flags();
2938 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2939 set_aggressive_opts_flags();
2941 #ifdef CC_INTERP
2942 // Clear flags not supported by the C++ interpreter
2943 FLAG_SET_DEFAULT(ProfileInterpreter, false);
2944 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2945 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
2946 #endif // CC_INTERP
2948 #ifdef COMPILER2
2949 if (!UseBiasedLocking || EmitSync != 0) {
2950 UseOptoBiasInlining = false;
2951 }
2952 #endif
2954 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
2955 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
2956 DebugNonSafepoints = true;
2957 }
2959 #ifndef PRODUCT
2960 if (CompileTheWorld) {
2961 // Force NmethodSweeper to sweep whole CodeCache each time.
2962 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
2963 NmethodSweepFraction = 1;
2964 }
2965 }
2966 #endif
2968 if (PrintCommandLineFlags) {
2969 CommandLineFlags::printSetFlags();
2970 }
2972 if (PrintFlagsFinal) {
2973 CommandLineFlags::printFlags();
2974 }
2976 return JNI_OK;
2977 }
2979 int Arguments::PropertyList_count(SystemProperty* pl) {
2980 int count = 0;
2981 while(pl != NULL) {
2982 count++;
2983 pl = pl->next();
2984 }
2985 return count;
2986 }
2988 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2989 assert(key != NULL, "just checking");
2990 SystemProperty* prop;
2991 for (prop = pl; prop != NULL; prop = prop->next()) {
2992 if (strcmp(key, prop->key()) == 0) return prop->value();
2993 }
2994 return NULL;
2995 }
2997 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2998 int count = 0;
2999 const char* ret_val = NULL;
3001 while(pl != NULL) {
3002 if(count >= index) {
3003 ret_val = pl->key();
3004 break;
3005 }
3006 count++;
3007 pl = pl->next();
3008 }
3010 return ret_val;
3011 }
3013 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3014 int count = 0;
3015 char* ret_val = NULL;
3017 while(pl != NULL) {
3018 if(count >= index) {
3019 ret_val = pl->value();
3020 break;
3021 }
3022 count++;
3023 pl = pl->next();
3024 }
3026 return ret_val;
3027 }
3029 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3030 SystemProperty* p = *plist;
3031 if (p == NULL) {
3032 *plist = new_p;
3033 } else {
3034 while (p->next() != NULL) {
3035 p = p->next();
3036 }
3037 p->set_next(new_p);
3038 }
3039 }
3041 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3042 if (plist == NULL)
3043 return;
3045 SystemProperty* new_p = new SystemProperty(k, v, true);
3046 PropertyList_add(plist, new_p);
3047 }
3049 // This add maintains unique property key in the list.
3050 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3051 if (plist == NULL)
3052 return;
3054 // If property key exist then update with new value.
3055 SystemProperty* prop;
3056 for (prop = *plist; prop != NULL; prop = prop->next()) {
3057 if (strcmp(k, prop->key()) == 0) {
3058 if (append) {
3059 prop->append_value(v);
3060 } else {
3061 prop->set_value(v);
3062 }
3063 return;
3064 }
3065 }
3067 PropertyList_add(plist, k, v);
3068 }
3070 #ifdef KERNEL
3071 char *Arguments::get_kernel_properties() {
3072 // Find properties starting with kernel and append them to string
3073 // We need to find out how long they are first because the URL's that they
3074 // might point to could get long.
3075 int length = 0;
3076 SystemProperty* prop;
3077 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3078 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3079 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3080 }
3081 }
3082 // Add one for null terminator.
3083 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3084 if (length != 0) {
3085 int pos = 0;
3086 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3087 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3088 jio_snprintf(&props[pos], length-pos,
3089 "-D%s=%s ", prop->key(), prop->value());
3090 pos = strlen(props);
3091 }
3092 }
3093 }
3094 // null terminate props in case of null
3095 props[length] = '\0';
3096 return props;
3097 }
3098 #endif // KERNEL
3100 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3101 // Returns true if all of the source pointed by src has been copied over to
3102 // the destination buffer pointed by buf. Otherwise, returns false.
3103 // Notes:
3104 // 1. If the length (buflen) of the destination buffer excluding the
3105 // NULL terminator character is not long enough for holding the expanded
3106 // pid characters, it also returns false instead of returning the partially
3107 // expanded one.
3108 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3109 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3110 char* buf, size_t buflen) {
3111 const char* p = src;
3112 char* b = buf;
3113 const char* src_end = &src[srclen];
3114 char* buf_end = &buf[buflen - 1];
3116 while (p < src_end && b < buf_end) {
3117 if (*p == '%') {
3118 switch (*(++p)) {
3119 case '%': // "%%" ==> "%"
3120 *b++ = *p++;
3121 break;
3122 case 'p': { // "%p" ==> current process id
3123 // buf_end points to the character before the last character so
3124 // that we could write '\0' to the end of the buffer.
3125 size_t buf_sz = buf_end - b + 1;
3126 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3128 // if jio_snprintf fails or the buffer is not long enough to hold
3129 // the expanded pid, returns false.
3130 if (ret < 0 || ret >= (int)buf_sz) {
3131 return false;
3132 } else {
3133 b += ret;
3134 assert(*b == '\0', "fail in copy_expand_pid");
3135 if (p == src_end && b == buf_end + 1) {
3136 // reach the end of the buffer.
3137 return true;
3138 }
3139 }
3140 p++;
3141 break;
3142 }
3143 default :
3144 *b++ = '%';
3145 }
3146 } else {
3147 *b++ = *p++;
3148 }
3149 }
3150 *b = '\0';
3151 return (p == src_end); // return false if not all of the source was copied
3152 }