Mon, 25 Jan 2010 18:03:29 -0500
6919980: G1: remove +UseG1GC from under experimental options (second attempt)
Summary: Trying this again, as the original change was lost.
Reviewed-by: ysr, jmasa
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
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 }
1207 #endif // KERNEL
1209 inline uintx max_heap_for_compressed_oops() {
1210 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1211 NOT_LP64(ShouldNotReachHere(); return 0);
1212 }
1214 bool Arguments::should_auto_select_low_pause_collector() {
1215 if (UseAutoGCSelectPolicy &&
1216 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1217 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1218 if (PrintGCDetails) {
1219 // Cannot use gclog_or_tty yet.
1220 tty->print_cr("Automatic selection of the low pause collector"
1221 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1222 }
1223 return true;
1224 }
1225 return false;
1226 }
1228 void Arguments::set_ergonomics_flags() {
1229 // Parallel GC is not compatible with sharing. If one specifies
1230 // that they want sharing explicitly, do not set ergonomics flags.
1231 if (DumpSharedSpaces || ForceSharedSpaces) {
1232 return;
1233 }
1235 if (os::is_server_class_machine() && !force_client_mode ) {
1236 // If no other collector is requested explicitly,
1237 // let the VM select the collector based on
1238 // machine class and automatic selection policy.
1239 if (!UseSerialGC &&
1240 !UseConcMarkSweepGC &&
1241 !UseG1GC &&
1242 !UseParNewGC &&
1243 !DumpSharedSpaces &&
1244 FLAG_IS_DEFAULT(UseParallelGC)) {
1245 if (should_auto_select_low_pause_collector()) {
1246 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1247 } else {
1248 FLAG_SET_ERGO(bool, UseParallelGC, true);
1249 }
1250 no_shared_spaces();
1251 }
1252 }
1254 #ifndef ZERO
1255 #ifdef _LP64
1256 // Check that UseCompressedOops can be set with the max heap size allocated
1257 // by ergonomics.
1258 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1259 #ifndef COMPILER1
1260 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1261 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1262 }
1263 #endif
1264 #ifdef _WIN64
1265 if (UseLargePages && UseCompressedOops) {
1266 // Cannot allocate guard pages for implicit checks in indexed addressing
1267 // mode, when large pages are specified on windows.
1268 // This flag could be switched ON if narrow oop base address is set to 0,
1269 // see code in Universe::initialize_heap().
1270 Universe::set_narrow_oop_use_implicit_null_checks(false);
1271 }
1272 #endif // _WIN64
1273 } else {
1274 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1275 warning("Max heap size too large for Compressed Oops");
1276 FLAG_SET_DEFAULT(UseCompressedOops, false);
1277 }
1278 }
1279 // Also checks that certain machines are slower with compressed oops
1280 // in vm_version initialization code.
1281 #endif // _LP64
1282 #endif // !ZERO
1283 }
1285 void Arguments::set_parallel_gc_flags() {
1286 assert(UseParallelGC || UseParallelOldGC, "Error");
1287 // If parallel old was requested, automatically enable parallel scavenge.
1288 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1289 FLAG_SET_DEFAULT(UseParallelGC, true);
1290 }
1292 // If no heap maximum was requested explicitly, use some reasonable fraction
1293 // of the physical memory, up to a maximum of 1GB.
1294 if (UseParallelGC) {
1295 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1296 Abstract_VM_Version::parallel_worker_threads());
1298 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1299 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1300 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1301 // See CR 6362902 for details.
1302 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1303 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1304 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1305 }
1306 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1307 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1308 }
1309 }
1311 if (UseParallelOldGC) {
1312 // Par compact uses lower default values since they are treated as
1313 // minimums. These are different defaults because of the different
1314 // interpretation and are not ergonomically set.
1315 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1316 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1317 }
1318 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1319 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1320 }
1321 }
1322 }
1323 }
1325 void Arguments::set_g1_gc_flags() {
1326 assert(UseG1GC, "Error");
1327 #ifdef COMPILER1
1328 FastTLABRefill = false;
1329 #endif
1330 FLAG_SET_DEFAULT(ParallelGCThreads,
1331 Abstract_VM_Version::parallel_worker_threads());
1332 if (ParallelGCThreads == 0) {
1333 FLAG_SET_DEFAULT(ParallelGCThreads,
1334 Abstract_VM_Version::parallel_worker_threads());
1335 }
1336 no_shared_spaces();
1338 // Set the maximum pause time goal to be a reasonable default.
1339 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1340 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1341 }
1342 }
1344 void Arguments::set_heap_size() {
1345 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1346 // Deprecated flag
1347 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1348 }
1350 const julong phys_mem =
1351 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1352 : (julong)MaxRAM;
1354 // If the maximum heap size has not been set with -Xmx,
1355 // then set it as fraction of the size of physical memory,
1356 // respecting the maximum and minimum sizes of the heap.
1357 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1358 julong reasonable_max = phys_mem / MaxRAMFraction;
1360 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1361 // Small physical memory, so use a minimum fraction of it for the heap
1362 reasonable_max = phys_mem / MinRAMFraction;
1363 } else {
1364 // Not-small physical memory, so require a heap at least
1365 // as large as MaxHeapSize
1366 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1367 }
1368 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1369 // Limit the heap size to ErgoHeapSizeLimit
1370 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1371 }
1372 if (UseCompressedOops) {
1373 // Limit the heap size to the maximum possible when using compressed oops
1374 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1375 }
1376 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1378 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1379 // An initial heap size was specified on the command line,
1380 // so be sure that the maximum size is consistent. Done
1381 // after call to allocatable_physical_memory because that
1382 // method might reduce the allocation size.
1383 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1384 }
1386 if (PrintGCDetails && Verbose) {
1387 // Cannot use gclog_or_tty yet.
1388 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1389 }
1390 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1391 }
1393 // If the initial_heap_size has not been set with InitialHeapSize
1394 // or -Xms, then set it as fraction of the size of physical memory,
1395 // respecting the maximum and minimum sizes of the heap.
1396 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1397 julong reasonable_minimum = (julong)(OldSize + NewSize);
1399 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1401 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1403 julong reasonable_initial = phys_mem / InitialRAMFraction;
1405 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1406 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1408 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1410 if (PrintGCDetails && Verbose) {
1411 // Cannot use gclog_or_tty yet.
1412 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1413 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1414 }
1415 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1416 set_min_heap_size((uintx)reasonable_minimum);
1417 }
1418 }
1420 // This must be called after ergonomics because we want bytecode rewriting
1421 // if the server compiler is used, or if UseSharedSpaces is disabled.
1422 void Arguments::set_bytecode_flags() {
1423 // Better not attempt to store into a read-only space.
1424 if (UseSharedSpaces) {
1425 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1426 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1427 }
1429 if (!RewriteBytecodes) {
1430 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1431 }
1432 }
1434 // Aggressive optimization flags -XX:+AggressiveOpts
1435 void Arguments::set_aggressive_opts_flags() {
1436 #ifdef COMPILER2
1437 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1438 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1439 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1440 }
1441 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1442 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1443 }
1445 // Feed the cache size setting into the JDK
1446 char buffer[1024];
1447 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1448 add_property(buffer);
1449 }
1450 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1451 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1452 }
1453 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1454 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1455 }
1456 #endif
1458 if (AggressiveOpts) {
1459 // Sample flag setting code
1460 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1461 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1462 // }
1463 }
1464 }
1466 //===========================================================================================================
1467 // Parsing of java.compiler property
1469 void Arguments::process_java_compiler_argument(char* arg) {
1470 // For backwards compatibility, Djava.compiler=NONE or ""
1471 // causes us to switch to -Xint mode UNLESS -Xdebug
1472 // is also specified.
1473 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1474 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1475 }
1476 }
1478 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1479 _sun_java_launcher = strdup(launcher);
1480 }
1482 bool Arguments::created_by_java_launcher() {
1483 assert(_sun_java_launcher != NULL, "property must have value");
1484 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1485 }
1487 //===========================================================================================================
1488 // Parsing of main arguments
1490 bool Arguments::verify_percentage(uintx value, const char* name) {
1491 if (value <= 100) {
1492 return true;
1493 }
1494 jio_fprintf(defaultStream::error_stream(),
1495 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1496 name, value);
1497 return false;
1498 }
1500 static void force_serial_gc() {
1501 FLAG_SET_DEFAULT(UseSerialGC, true);
1502 FLAG_SET_DEFAULT(UseParNewGC, false);
1503 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1504 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1505 FLAG_SET_DEFAULT(UseParallelGC, false);
1506 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1507 FLAG_SET_DEFAULT(UseG1GC, false);
1508 }
1510 static bool verify_serial_gc_flags() {
1511 return (UseSerialGC &&
1512 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1513 UseParallelGC || UseParallelOldGC));
1514 }
1516 // Check consistency of GC selection
1517 bool Arguments::check_gc_consistency() {
1518 bool status = true;
1519 // Ensure that the user has not selected conflicting sets
1520 // of collectors. [Note: this check is merely a user convenience;
1521 // collectors over-ride each other so that only a non-conflicting
1522 // set is selected; however what the user gets is not what they
1523 // may have expected from the combination they asked for. It's
1524 // better to reduce user confusion by not allowing them to
1525 // select conflicting combinations.
1526 uint i = 0;
1527 if (UseSerialGC) i++;
1528 if (UseConcMarkSweepGC || UseParNewGC) i++;
1529 if (UseParallelGC || UseParallelOldGC) i++;
1530 if (UseG1GC) i++;
1531 if (i > 1) {
1532 jio_fprintf(defaultStream::error_stream(),
1533 "Conflicting collector combinations in option list; "
1534 "please refer to the release notes for the combinations "
1535 "allowed\n");
1536 status = false;
1537 }
1539 return status;
1540 }
1542 // Check the consistency of vm_init_args
1543 bool Arguments::check_vm_args_consistency() {
1544 // Method for adding checks for flag consistency.
1545 // The intent is to warn the user of all possible conflicts,
1546 // before returning an error.
1547 // Note: Needs platform-dependent factoring.
1548 bool status = true;
1550 #if ( (defined(COMPILER2) && defined(SPARC)))
1551 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1552 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1553 // x86. Normally, VM_Version_init must be called from init_globals in
1554 // init.cpp, which is called by the initial java thread *after* arguments
1555 // have been parsed. VM_Version_init gets called twice on sparc.
1556 extern void VM_Version_init();
1557 VM_Version_init();
1558 if (!VM_Version::has_v9()) {
1559 jio_fprintf(defaultStream::error_stream(),
1560 "V8 Machine detected, Server requires V9\n");
1561 status = false;
1562 }
1563 #endif /* COMPILER2 && SPARC */
1565 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1566 // builds so the cost of stack banging can be measured.
1567 #if (defined(PRODUCT) && defined(SOLARIS))
1568 if (!UseBoundThreads && !UseStackBanging) {
1569 jio_fprintf(defaultStream::error_stream(),
1570 "-UseStackBanging conflicts with -UseBoundThreads\n");
1572 status = false;
1573 }
1574 #endif
1576 if (TLABRefillWasteFraction == 0) {
1577 jio_fprintf(defaultStream::error_stream(),
1578 "TLABRefillWasteFraction should be a denominator, "
1579 "not " SIZE_FORMAT "\n",
1580 TLABRefillWasteFraction);
1581 status = false;
1582 }
1584 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1585 "MaxLiveObjectEvacuationRatio");
1586 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1587 "AdaptiveSizePolicyWeight");
1588 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1589 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1590 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1591 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1593 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1594 jio_fprintf(defaultStream::error_stream(),
1595 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1596 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1597 MinHeapFreeRatio, MaxHeapFreeRatio);
1598 status = false;
1599 }
1600 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1601 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1603 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1604 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1605 }
1607 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1608 // Settings to encourage splitting.
1609 if (!FLAG_IS_CMDLINE(NewRatio)) {
1610 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1611 }
1612 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1613 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1614 }
1615 }
1617 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1618 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1619 if (GCTimeLimit == 100) {
1620 // Turn off gc-overhead-limit-exceeded checks
1621 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1622 }
1624 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1626 // Check user specified sharing option conflict with Parallel GC
1627 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC ||
1628 UseParallelGC || UseParallelOldGC ||
1629 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1631 if (cannot_share) {
1632 // Either force sharing on by forcing the other options off, or
1633 // force sharing off.
1634 if (DumpSharedSpaces || ForceSharedSpaces) {
1635 jio_fprintf(defaultStream::error_stream(),
1636 "Reverting to Serial GC because of %s\n",
1637 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump");
1638 force_serial_gc();
1639 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1640 } else {
1641 if (UseSharedSpaces && Verbose) {
1642 jio_fprintf(defaultStream::error_stream(),
1643 "Turning off use of shared archive because of "
1644 "choice of garbage collector or large pages\n");
1645 }
1646 no_shared_spaces();
1647 }
1648 }
1650 status = status && check_gc_consistency();
1652 if (_has_alloc_profile) {
1653 if (UseParallelGC || UseParallelOldGC) {
1654 jio_fprintf(defaultStream::error_stream(),
1655 "error: invalid argument combination.\n"
1656 "Allocation profiling (-Xaprof) cannot be used together with "
1657 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1658 status = false;
1659 }
1660 if (UseConcMarkSweepGC) {
1661 jio_fprintf(defaultStream::error_stream(),
1662 "error: invalid argument combination.\n"
1663 "Allocation profiling (-Xaprof) cannot be used together with "
1664 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1665 status = false;
1666 }
1667 }
1669 if (CMSIncrementalMode) {
1670 if (!UseConcMarkSweepGC) {
1671 jio_fprintf(defaultStream::error_stream(),
1672 "error: invalid argument combination.\n"
1673 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1674 "selected in order\nto use CMSIncrementalMode.\n");
1675 status = false;
1676 } else {
1677 status = status && verify_percentage(CMSIncrementalDutyCycle,
1678 "CMSIncrementalDutyCycle");
1679 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1680 "CMSIncrementalDutyCycleMin");
1681 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1682 "CMSIncrementalSafetyFactor");
1683 status = status && verify_percentage(CMSIncrementalOffset,
1684 "CMSIncrementalOffset");
1685 status = status && verify_percentage(CMSExpAvgFactor,
1686 "CMSExpAvgFactor");
1687 // If it was not set on the command line, set
1688 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1689 if (CMSInitiatingOccupancyFraction < 0) {
1690 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1691 }
1692 }
1693 }
1695 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1696 // insists that we hold the requisite locks so that the iteration is
1697 // MT-safe. For the verification at start-up and shut-down, we don't
1698 // yet have a good way of acquiring and releasing these locks,
1699 // which are not visible at the CollectedHeap level. We want to
1700 // be able to acquire these locks and then do the iteration rather
1701 // than just disable the lock verification. This will be fixed under
1702 // bug 4788986.
1703 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1704 if (VerifyGCStartAt == 0) {
1705 warning("Heap verification at start-up disabled "
1706 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1707 VerifyGCStartAt = 1; // Disable verification at start-up
1708 }
1709 if (VerifyBeforeExit) {
1710 warning("Heap verification at shutdown disabled "
1711 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1712 VerifyBeforeExit = false; // Disable verification at shutdown
1713 }
1714 }
1716 // Note: only executed in non-PRODUCT mode
1717 if (!UseAsyncConcMarkSweepGC &&
1718 (ExplicitGCInvokesConcurrent ||
1719 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1720 jio_fprintf(defaultStream::error_stream(),
1721 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1722 " with -UseAsyncConcMarkSweepGC");
1723 status = false;
1724 }
1726 return status;
1727 }
1729 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1730 const char* option_type) {
1731 if (ignore) return false;
1733 const char* spacer = " ";
1734 if (option_type == NULL) {
1735 option_type = ++spacer; // Set both to the empty string.
1736 }
1738 if (os::obsolete_option(option)) {
1739 jio_fprintf(defaultStream::error_stream(),
1740 "Obsolete %s%soption: %s\n", option_type, spacer,
1741 option->optionString);
1742 return false;
1743 } else {
1744 jio_fprintf(defaultStream::error_stream(),
1745 "Unrecognized %s%soption: %s\n", option_type, spacer,
1746 option->optionString);
1747 return true;
1748 }
1749 }
1751 static const char* user_assertion_options[] = {
1752 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1753 };
1755 static const char* system_assertion_options[] = {
1756 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1757 };
1759 // Return true if any of the strings in null-terminated array 'names' matches.
1760 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1761 // the option must match exactly.
1762 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1763 bool tail_allowed) {
1764 for (/* empty */; *names != NULL; ++names) {
1765 if (match_option(option, *names, tail)) {
1766 if (**tail == '\0' || tail_allowed && **tail == ':') {
1767 return true;
1768 }
1769 }
1770 }
1771 return false;
1772 }
1774 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1775 julong* long_arg,
1776 julong min_size) {
1777 if (!atomull(s, long_arg)) return arg_unreadable;
1778 return check_memory_size(*long_arg, min_size);
1779 }
1781 // Parse JavaVMInitArgs structure
1783 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1784 // For components of the system classpath.
1785 SysClassPath scp(Arguments::get_sysclasspath());
1786 bool scp_assembly_required = false;
1788 // Save default settings for some mode flags
1789 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1790 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1791 Arguments::_ClipInlining = ClipInlining;
1792 Arguments::_BackgroundCompilation = BackgroundCompilation;
1793 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1795 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1796 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1797 if (result != JNI_OK) {
1798 return result;
1799 }
1801 // Parse JavaVMInitArgs structure passed in
1802 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1803 if (result != JNI_OK) {
1804 return result;
1805 }
1807 if (AggressiveOpts) {
1808 // Insert alt-rt.jar between user-specified bootclasspath
1809 // prefix and the default bootclasspath. os::set_boot_path()
1810 // uses meta_index_dir as the default bootclasspath directory.
1811 const char* altclasses_jar = "alt-rt.jar";
1812 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1813 strlen(altclasses_jar);
1814 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1815 strcpy(altclasses_path, get_meta_index_dir());
1816 strcat(altclasses_path, altclasses_jar);
1817 scp.add_suffix_to_prefix(altclasses_path);
1818 scp_assembly_required = true;
1819 FREE_C_HEAP_ARRAY(char, altclasses_path);
1820 }
1822 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1823 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1824 if (result != JNI_OK) {
1825 return result;
1826 }
1828 // Do final processing now that all arguments have been parsed
1829 result = finalize_vm_init_args(&scp, scp_assembly_required);
1830 if (result != JNI_OK) {
1831 return result;
1832 }
1834 return JNI_OK;
1835 }
1837 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1838 SysClassPath* scp_p,
1839 bool* scp_assembly_required_p,
1840 FlagValueOrigin origin) {
1841 // Remaining part of option string
1842 const char* tail;
1844 // iterate over arguments
1845 for (int index = 0; index < args->nOptions; index++) {
1846 bool is_absolute_path = false; // for -agentpath vs -agentlib
1848 const JavaVMOption* option = args->options + index;
1850 if (!match_option(option, "-Djava.class.path", &tail) &&
1851 !match_option(option, "-Dsun.java.command", &tail) &&
1852 !match_option(option, "-Dsun.java.launcher", &tail)) {
1854 // add all jvm options to the jvm_args string. This string
1855 // is used later to set the java.vm.args PerfData string constant.
1856 // the -Djava.class.path and the -Dsun.java.command options are
1857 // omitted from jvm_args string as each have their own PerfData
1858 // string constant object.
1859 build_jvm_args(option->optionString);
1860 }
1862 // -verbose:[class/gc/jni]
1863 if (match_option(option, "-verbose", &tail)) {
1864 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1865 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1866 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1867 } else if (!strcmp(tail, ":gc")) {
1868 FLAG_SET_CMDLINE(bool, PrintGC, true);
1869 } else if (!strcmp(tail, ":jni")) {
1870 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1871 }
1872 // -da / -ea / -disableassertions / -enableassertions
1873 // These accept an optional class/package name separated by a colon, e.g.,
1874 // -da:java.lang.Thread.
1875 } else if (match_option(option, user_assertion_options, &tail, true)) {
1876 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1877 if (*tail == '\0') {
1878 JavaAssertions::setUserClassDefault(enable);
1879 } else {
1880 assert(*tail == ':', "bogus match by match_option()");
1881 JavaAssertions::addOption(tail + 1, enable);
1882 }
1883 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1884 } else if (match_option(option, system_assertion_options, &tail, false)) {
1885 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1886 JavaAssertions::setSystemClassDefault(enable);
1887 // -bootclasspath:
1888 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1889 scp_p->reset_path(tail);
1890 *scp_assembly_required_p = true;
1891 // -bootclasspath/a:
1892 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1893 scp_p->add_suffix(tail);
1894 *scp_assembly_required_p = true;
1895 // -bootclasspath/p:
1896 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1897 scp_p->add_prefix(tail);
1898 *scp_assembly_required_p = true;
1899 // -Xrun
1900 } else if (match_option(option, "-Xrun", &tail)) {
1901 if (tail != NULL) {
1902 const char* pos = strchr(tail, ':');
1903 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1904 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1905 name[len] = '\0';
1907 char *options = NULL;
1908 if(pos != NULL) {
1909 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1910 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1911 }
1912 #ifdef JVMTI_KERNEL
1913 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1914 warning("profiling and debugging agents are not supported with Kernel VM");
1915 } else
1916 #endif // JVMTI_KERNEL
1917 add_init_library(name, options);
1918 }
1919 // -agentlib and -agentpath
1920 } else if (match_option(option, "-agentlib:", &tail) ||
1921 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1922 if(tail != NULL) {
1923 const char* pos = strchr(tail, '=');
1924 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1925 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1926 name[len] = '\0';
1928 char *options = NULL;
1929 if(pos != NULL) {
1930 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1931 }
1932 #ifdef JVMTI_KERNEL
1933 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1934 warning("profiling and debugging agents are not supported with Kernel VM");
1935 } else
1936 #endif // JVMTI_KERNEL
1937 add_init_agent(name, options, is_absolute_path);
1939 }
1940 // -javaagent
1941 } else if (match_option(option, "-javaagent:", &tail)) {
1942 if(tail != NULL) {
1943 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1944 add_init_agent("instrument", options, false);
1945 }
1946 // -Xnoclassgc
1947 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1948 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1949 // -Xincgc: i-CMS
1950 } else if (match_option(option, "-Xincgc", &tail)) {
1951 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1952 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1953 // -Xnoincgc: no i-CMS
1954 } else if (match_option(option, "-Xnoincgc", &tail)) {
1955 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1956 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1957 // -Xconcgc
1958 } else if (match_option(option, "-Xconcgc", &tail)) {
1959 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1960 // -Xnoconcgc
1961 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1962 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1963 // -Xbatch
1964 } else if (match_option(option, "-Xbatch", &tail)) {
1965 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1966 // -Xmn for compatibility with other JVM vendors
1967 } else if (match_option(option, "-Xmn", &tail)) {
1968 julong long_initial_eden_size = 0;
1969 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1970 if (errcode != arg_in_range) {
1971 jio_fprintf(defaultStream::error_stream(),
1972 "Invalid initial eden size: %s\n", option->optionString);
1973 describe_range_error(errcode);
1974 return JNI_EINVAL;
1975 }
1976 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
1977 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
1978 // -Xms
1979 } else if (match_option(option, "-Xms", &tail)) {
1980 julong long_initial_heap_size = 0;
1981 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1982 if (errcode != arg_in_range) {
1983 jio_fprintf(defaultStream::error_stream(),
1984 "Invalid initial heap size: %s\n", option->optionString);
1985 describe_range_error(errcode);
1986 return JNI_EINVAL;
1987 }
1988 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
1989 // Currently the minimum size and the initial heap sizes are the same.
1990 set_min_heap_size(InitialHeapSize);
1991 // -Xmx
1992 } else if (match_option(option, "-Xmx", &tail)) {
1993 julong long_max_heap_size = 0;
1994 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1995 if (errcode != arg_in_range) {
1996 jio_fprintf(defaultStream::error_stream(),
1997 "Invalid maximum heap size: %s\n", option->optionString);
1998 describe_range_error(errcode);
1999 return JNI_EINVAL;
2000 }
2001 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2002 // Xmaxf
2003 } else if (match_option(option, "-Xmaxf", &tail)) {
2004 int maxf = (int)(atof(tail) * 100);
2005 if (maxf < 0 || maxf > 100) {
2006 jio_fprintf(defaultStream::error_stream(),
2007 "Bad max heap free percentage size: %s\n",
2008 option->optionString);
2009 return JNI_EINVAL;
2010 } else {
2011 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2012 }
2013 // Xminf
2014 } else if (match_option(option, "-Xminf", &tail)) {
2015 int minf = (int)(atof(tail) * 100);
2016 if (minf < 0 || minf > 100) {
2017 jio_fprintf(defaultStream::error_stream(),
2018 "Bad min heap free percentage size: %s\n",
2019 option->optionString);
2020 return JNI_EINVAL;
2021 } else {
2022 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2023 }
2024 // -Xss
2025 } else if (match_option(option, "-Xss", &tail)) {
2026 julong long_ThreadStackSize = 0;
2027 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2028 if (errcode != arg_in_range) {
2029 jio_fprintf(defaultStream::error_stream(),
2030 "Invalid thread stack size: %s\n", option->optionString);
2031 describe_range_error(errcode);
2032 return JNI_EINVAL;
2033 }
2034 // Internally track ThreadStackSize in units of 1024 bytes.
2035 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2036 round_to((int)long_ThreadStackSize, K) / K);
2037 // -Xoss
2038 } else if (match_option(option, "-Xoss", &tail)) {
2039 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2040 // -Xmaxjitcodesize
2041 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2042 julong long_ReservedCodeCacheSize = 0;
2043 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2044 (size_t)InitialCodeCacheSize);
2045 if (errcode != arg_in_range) {
2046 jio_fprintf(defaultStream::error_stream(),
2047 "Invalid maximum code cache size: %s\n",
2048 option->optionString);
2049 describe_range_error(errcode);
2050 return JNI_EINVAL;
2051 }
2052 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2053 // -green
2054 } else if (match_option(option, "-green", &tail)) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "Green threads support not available\n");
2057 return JNI_EINVAL;
2058 // -native
2059 } else if (match_option(option, "-native", &tail)) {
2060 // HotSpot always uses native threads, ignore silently for compatibility
2061 // -Xsqnopause
2062 } else if (match_option(option, "-Xsqnopause", &tail)) {
2063 // EVM option, ignore silently for compatibility
2064 // -Xrs
2065 } else if (match_option(option, "-Xrs", &tail)) {
2066 // Classic/EVM option, new functionality
2067 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2068 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2069 // change default internal VM signals used - lower case for back compat
2070 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2071 // -Xoptimize
2072 } else if (match_option(option, "-Xoptimize", &tail)) {
2073 // EVM option, ignore silently for compatibility
2074 // -Xprof
2075 } else if (match_option(option, "-Xprof", &tail)) {
2076 #ifndef FPROF_KERNEL
2077 _has_profile = true;
2078 #else // FPROF_KERNEL
2079 // do we have to exit?
2080 warning("Kernel VM does not support flat profiling.");
2081 #endif // FPROF_KERNEL
2082 // -Xaprof
2083 } else if (match_option(option, "-Xaprof", &tail)) {
2084 _has_alloc_profile = true;
2085 // -Xconcurrentio
2086 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2087 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2088 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2089 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2090 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2091 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2093 // -Xinternalversion
2094 } else if (match_option(option, "-Xinternalversion", &tail)) {
2095 jio_fprintf(defaultStream::output_stream(), "%s\n",
2096 VM_Version::internal_vm_info_string());
2097 vm_exit(0);
2098 #ifndef PRODUCT
2099 // -Xprintflags
2100 } else if (match_option(option, "-Xprintflags", &tail)) {
2101 CommandLineFlags::printFlags();
2102 vm_exit(0);
2103 #endif
2104 // -D
2105 } else if (match_option(option, "-D", &tail)) {
2106 if (!add_property(tail)) {
2107 return JNI_ENOMEM;
2108 }
2109 // Out of the box management support
2110 if (match_option(option, "-Dcom.sun.management", &tail)) {
2111 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2112 }
2113 // -Xint
2114 } else if (match_option(option, "-Xint", &tail)) {
2115 set_mode_flags(_int);
2116 // -Xmixed
2117 } else if (match_option(option, "-Xmixed", &tail)) {
2118 set_mode_flags(_mixed);
2119 // -Xcomp
2120 } else if (match_option(option, "-Xcomp", &tail)) {
2121 // for testing the compiler; turn off all flags that inhibit compilation
2122 set_mode_flags(_comp);
2124 // -Xshare:dump
2125 } else if (match_option(option, "-Xshare:dump", &tail)) {
2126 #ifdef TIERED
2127 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2128 set_mode_flags(_int); // Prevent compilation, which creates objects
2129 #elif defined(COMPILER2)
2130 vm_exit_during_initialization(
2131 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2132 #elif defined(KERNEL)
2133 vm_exit_during_initialization(
2134 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2135 #else
2136 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2137 set_mode_flags(_int); // Prevent compilation, which creates objects
2138 #endif
2139 // -Xshare:on
2140 } else if (match_option(option, "-Xshare:on", &tail)) {
2141 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2142 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2143 #ifdef TIERED
2144 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2145 #endif // TIERED
2146 // -Xshare:auto
2147 } else if (match_option(option, "-Xshare:auto", &tail)) {
2148 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2149 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2150 // -Xshare:off
2151 } else if (match_option(option, "-Xshare:off", &tail)) {
2152 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2153 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2155 // -Xverify
2156 } else if (match_option(option, "-Xverify", &tail)) {
2157 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2158 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2159 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2160 } else if (strcmp(tail, ":remote") == 0) {
2161 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2162 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2163 } else if (strcmp(tail, ":none") == 0) {
2164 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2165 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2166 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2167 return JNI_EINVAL;
2168 }
2169 // -Xdebug
2170 } else if (match_option(option, "-Xdebug", &tail)) {
2171 // note this flag has been used, then ignore
2172 set_xdebug_mode(true);
2173 // -Xnoagent
2174 } else if (match_option(option, "-Xnoagent", &tail)) {
2175 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2176 } else if (match_option(option, "-Xboundthreads", &tail)) {
2177 // Bind user level threads to kernel threads (Solaris only)
2178 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2179 } else if (match_option(option, "-Xloggc:", &tail)) {
2180 // Redirect GC output to the file. -Xloggc:<filename>
2181 // ostream_init_log(), when called will use this filename
2182 // to initialize a fileStream.
2183 _gc_log_filename = strdup(tail);
2184 FLAG_SET_CMDLINE(bool, PrintGC, true);
2185 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2186 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2188 // JNI hooks
2189 } else if (match_option(option, "-Xcheck", &tail)) {
2190 if (!strcmp(tail, ":jni")) {
2191 CheckJNICalls = true;
2192 } else if (is_bad_option(option, args->ignoreUnrecognized,
2193 "check")) {
2194 return JNI_EINVAL;
2195 }
2196 } else if (match_option(option, "vfprintf", &tail)) {
2197 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2198 } else if (match_option(option, "exit", &tail)) {
2199 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2200 } else if (match_option(option, "abort", &tail)) {
2201 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2202 // -XX:+AggressiveHeap
2203 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2205 // This option inspects the machine and attempts to set various
2206 // parameters to be optimal for long-running, memory allocation
2207 // intensive jobs. It is intended for machines with large
2208 // amounts of cpu and memory.
2210 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2211 // VM, but we may not be able to represent the total physical memory
2212 // available (like having 8gb of memory on a box but using a 32bit VM).
2213 // Thus, we need to make sure we're using a julong for intermediate
2214 // calculations.
2215 julong initHeapSize;
2216 julong total_memory = os::physical_memory();
2218 if (total_memory < (julong)256*M) {
2219 jio_fprintf(defaultStream::error_stream(),
2220 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2221 vm_exit(1);
2222 }
2224 // The heap size is half of available memory, or (at most)
2225 // all of possible memory less 160mb (leaving room for the OS
2226 // when using ISM). This is the maximum; because adaptive sizing
2227 // is turned on below, the actual space used may be smaller.
2229 initHeapSize = MIN2(total_memory / (julong)2,
2230 total_memory - (julong)160*M);
2232 // Make sure that if we have a lot of memory we cap the 32 bit
2233 // process space. The 64bit VM version of this function is a nop.
2234 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2236 // The perm gen is separate but contiguous with the
2237 // object heap (and is reserved with it) so subtract it
2238 // from the heap size.
2239 if (initHeapSize > MaxPermSize) {
2240 initHeapSize = initHeapSize - MaxPermSize;
2241 } else {
2242 warning("AggressiveHeap and MaxPermSize values may conflict");
2243 }
2245 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2246 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2247 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2248 // Currently the minimum size and the initial heap sizes are the same.
2249 set_min_heap_size(initHeapSize);
2250 }
2251 if (FLAG_IS_DEFAULT(NewSize)) {
2252 // Make the young generation 3/8ths of the total heap.
2253 FLAG_SET_CMDLINE(uintx, NewSize,
2254 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2255 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2256 }
2258 FLAG_SET_DEFAULT(UseLargePages, true);
2260 // Increase some data structure sizes for efficiency
2261 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2262 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2263 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2265 // See the OldPLABSize comment below, but replace 'after promotion'
2266 // with 'after copying'. YoungPLABSize is the size of the survivor
2267 // space per-gc-thread buffers. The default is 4kw.
2268 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2270 // OldPLABSize is the size of the buffers in the old gen that
2271 // UseParallelGC uses to promote live data that doesn't fit in the
2272 // survivor spaces. At any given time, there's one for each gc thread.
2273 // The default size is 1kw. These buffers are rarely used, since the
2274 // survivor spaces are usually big enough. For specjbb, however, there
2275 // are occasions when there's lots of live data in the young gen
2276 // and we end up promoting some of it. We don't have a definite
2277 // explanation for why bumping OldPLABSize helps, but the theory
2278 // is that a bigger PLAB results in retaining something like the
2279 // original allocation order after promotion, which improves mutator
2280 // locality. A minor effect may be that larger PLABs reduce the
2281 // number of PLAB allocation events during gc. The value of 8kw
2282 // was arrived at by experimenting with specjbb.
2283 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2285 // CompilationPolicyChoice=0 causes the server compiler to adopt
2286 // a more conservative which-method-do-I-compile policy when one
2287 // of the counters maintained by the interpreter trips. The
2288 // result is reduced startup time and improved specjbb and
2289 // alacrity performance. Zero is the default, but we set it
2290 // explicitly here in case the default changes.
2291 // See runtime/compilationPolicy.*.
2292 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2294 // Enable parallel GC and adaptive generation sizing
2295 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2296 FLAG_SET_DEFAULT(ParallelGCThreads,
2297 Abstract_VM_Version::parallel_worker_threads());
2299 // Encourage steady state memory management
2300 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2302 // This appears to improve mutator locality
2303 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2305 // Get around early Solaris scheduling bug
2306 // (affinity vs other jobs on system)
2307 // but disallow DR and offlining (5008695).
2308 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2310 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2311 // The last option must always win.
2312 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2313 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2314 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2315 // The last option must always win.
2316 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2317 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2318 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2319 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Please use CMSClassUnloadingEnabled in place of "
2322 "CMSPermGenSweepingEnabled in the future\n");
2323 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2324 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2325 jio_fprintf(defaultStream::error_stream(),
2326 "Please use -XX:+UseGCOverheadLimit in place of "
2327 "-XX:+UseGCTimeLimit in the future\n");
2328 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2329 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2330 jio_fprintf(defaultStream::error_stream(),
2331 "Please use -XX:-UseGCOverheadLimit in place of "
2332 "-XX:-UseGCTimeLimit in the future\n");
2333 // The TLE options are for compatibility with 1.3 and will be
2334 // removed without notice in a future release. These options
2335 // are not to be documented.
2336 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2337 // No longer used.
2338 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2339 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2340 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2341 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2342 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2343 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2344 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2345 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2346 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2347 // No longer used.
2348 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2349 julong long_tlab_size = 0;
2350 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2351 if (errcode != arg_in_range) {
2352 jio_fprintf(defaultStream::error_stream(),
2353 "Invalid TLAB size: %s\n", option->optionString);
2354 describe_range_error(errcode);
2355 return JNI_EINVAL;
2356 }
2357 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2358 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2359 // No longer used.
2360 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2361 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2362 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2363 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2364 SOLARIS_ONLY(
2365 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2366 warning("-XX:+UsePermISM is obsolete.");
2367 FLAG_SET_CMDLINE(bool, UseISM, true);
2368 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2369 FLAG_SET_CMDLINE(bool, UseISM, false);
2370 )
2371 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2372 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2373 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2374 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2375 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2376 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2377 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2378 #ifdef SOLARIS
2379 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2380 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2381 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2382 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2383 #else // ndef SOLARIS
2384 jio_fprintf(defaultStream::error_stream(),
2385 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2386 return JNI_EINVAL;
2387 #endif // ndef SOLARIS
2388 #ifdef ASSERT
2389 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2390 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2391 // disable scavenge before parallel mark-compact
2392 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2393 #endif
2394 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2395 julong cms_blocks_to_claim = (julong)atol(tail);
2396 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2397 jio_fprintf(defaultStream::error_stream(),
2398 "Please use -XX:OldPLABSize in place of "
2399 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2400 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2401 julong cms_blocks_to_claim = (julong)atol(tail);
2402 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Please use -XX:OldPLABSize in place of "
2405 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2406 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2407 julong old_plab_size = 0;
2408 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2409 if (errcode != arg_in_range) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "Invalid old PLAB size: %s\n", option->optionString);
2412 describe_range_error(errcode);
2413 return JNI_EINVAL;
2414 }
2415 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Please use -XX:OldPLABSize in place of "
2418 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2419 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2420 julong young_plab_size = 0;
2421 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2422 if (errcode != arg_in_range) {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Invalid young PLAB size: %s\n", option->optionString);
2425 describe_range_error(errcode);
2426 return JNI_EINVAL;
2427 }
2428 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Please use -XX:YoungPLABSize in place of "
2431 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2432 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2433 // Skip -XX:Flags= since that case has already been handled
2434 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2435 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2436 return JNI_EINVAL;
2437 }
2438 }
2439 // Unknown option
2440 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2441 return JNI_ERR;
2442 }
2443 }
2444 // Change the default value for flags which have different default values
2445 // when working with older JDKs.
2446 if (JDK_Version::current().compare_major(6) <= 0 &&
2447 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2448 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2449 }
2450 return JNI_OK;
2451 }
2453 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2454 // This must be done after all -D arguments have been processed.
2455 scp_p->expand_endorsed();
2457 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2458 // Assemble the bootclasspath elements into the final path.
2459 Arguments::set_sysclasspath(scp_p->combined_path());
2460 }
2462 // This must be done after all arguments have been processed.
2463 // java_compiler() true means set to "NONE" or empty.
2464 if (java_compiler() && !xdebug_mode()) {
2465 // For backwards compatibility, we switch to interpreted mode if
2466 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2467 // not specified.
2468 set_mode_flags(_int);
2469 }
2470 if (CompileThreshold == 0) {
2471 set_mode_flags(_int);
2472 }
2474 #ifdef TIERED
2475 // If we are using tiered compilation in the tiered vm then c1 will
2476 // do the profiling and we don't want to waste that time in the
2477 // interpreter.
2478 if (TieredCompilation) {
2479 ProfileInterpreter = false;
2480 } else {
2481 // Since we are running vanilla server we must adjust the compile threshold
2482 // unless the user has already adjusted it because the default threshold assumes
2483 // we will run tiered.
2485 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2486 CompileThreshold = Tier2CompileThreshold;
2487 }
2488 }
2489 #endif // TIERED
2491 #ifndef COMPILER2
2492 // Don't degrade server performance for footprint
2493 if (FLAG_IS_DEFAULT(UseLargePages) &&
2494 MaxHeapSize < LargePageHeapSizeThreshold) {
2495 // No need for large granularity pages w/small heaps.
2496 // Note that large pages are enabled/disabled for both the
2497 // Java heap and the code cache.
2498 FLAG_SET_DEFAULT(UseLargePages, false);
2499 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2500 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2501 }
2503 #else
2504 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2505 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2506 }
2507 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2508 if (UseG1GC) {
2509 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2510 }
2511 #endif
2513 if (!check_vm_args_consistency()) {
2514 return JNI_ERR;
2515 }
2517 return JNI_OK;
2518 }
2520 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2521 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2522 scp_assembly_required_p);
2523 }
2525 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2526 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2527 scp_assembly_required_p);
2528 }
2530 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2531 const int N_MAX_OPTIONS = 64;
2532 const int OPTION_BUFFER_SIZE = 1024;
2533 char buffer[OPTION_BUFFER_SIZE];
2535 // The variable will be ignored if it exceeds the length of the buffer.
2536 // Don't check this variable if user has special privileges
2537 // (e.g. unix su command).
2538 if (os::getenv(name, buffer, sizeof(buffer)) &&
2539 !os::have_special_privileges()) {
2540 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Picked up %s: %s\n", name, buffer);
2543 char* rd = buffer; // pointer to the input string (rd)
2544 int i;
2545 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2546 while (isspace(*rd)) rd++; // skip whitespace
2547 if (*rd == 0) break; // we re done when the input string is read completely
2549 // The output, option string, overwrites the input string.
2550 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2551 // input string (rd).
2552 char* wrt = rd;
2554 options[i++].optionString = wrt; // Fill in option
2555 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2556 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2557 int quote = *rd; // matching quote to look for
2558 rd++; // don't copy open quote
2559 while (*rd != quote) { // include everything (even spaces) up until quote
2560 if (*rd == 0) { // string termination means unmatched string
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Unmatched quote in %s\n", name);
2563 return JNI_ERR;
2564 }
2565 *wrt++ = *rd++; // copy to option string
2566 }
2567 rd++; // don't copy close quote
2568 } else {
2569 *wrt++ = *rd++; // copy to option string
2570 }
2571 }
2572 // Need to check if we're done before writing a NULL,
2573 // because the write could be to the byte that rd is pointing to.
2574 if (*rd++ == 0) {
2575 *wrt = 0;
2576 break;
2577 }
2578 *wrt = 0; // Zero terminate option
2579 }
2580 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2581 JavaVMInitArgs vm_args;
2582 vm_args.version = JNI_VERSION_1_2;
2583 vm_args.options = options;
2584 vm_args.nOptions = i;
2585 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2587 if (PrintVMOptions) {
2588 const char* tail;
2589 for (int i = 0; i < vm_args.nOptions; i++) {
2590 const JavaVMOption *option = vm_args.options + i;
2591 if (match_option(option, "-XX:", &tail)) {
2592 logOption(tail);
2593 }
2594 }
2595 }
2597 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2598 }
2599 return JNI_OK;
2600 }
2602 // Parse entry point called from JNI_CreateJavaVM
2604 jint Arguments::parse(const JavaVMInitArgs* args) {
2606 // Sharing support
2607 // Construct the path to the archive
2608 char jvm_path[JVM_MAXPATHLEN];
2609 os::jvm_path(jvm_path, sizeof(jvm_path));
2610 #ifdef TIERED
2611 if (strstr(jvm_path, "client") != NULL) {
2612 force_client_mode = true;
2613 }
2614 #endif // TIERED
2615 char *end = strrchr(jvm_path, *os::file_separator());
2616 if (end != NULL) *end = '\0';
2617 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2618 strlen(os::file_separator()) + 20);
2619 if (shared_archive_path == NULL) return JNI_ENOMEM;
2620 strcpy(shared_archive_path, jvm_path);
2621 strcat(shared_archive_path, os::file_separator());
2622 strcat(shared_archive_path, "classes");
2623 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2624 strcat(shared_archive_path, ".jsa");
2625 SharedArchivePath = shared_archive_path;
2627 // Remaining part of option string
2628 const char* tail;
2630 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2631 bool settings_file_specified = false;
2632 const char* flags_file;
2633 int index;
2634 for (index = 0; index < args->nOptions; index++) {
2635 const JavaVMOption *option = args->options + index;
2636 if (match_option(option, "-XX:Flags=", &tail)) {
2637 flags_file = tail;
2638 settings_file_specified = true;
2639 }
2640 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2641 PrintVMOptions = true;
2642 }
2643 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2644 PrintVMOptions = false;
2645 }
2646 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2647 IgnoreUnrecognizedVMOptions = true;
2648 }
2649 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2650 IgnoreUnrecognizedVMOptions = false;
2651 }
2652 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2653 CommandLineFlags::printFlags();
2654 vm_exit(0);
2655 }
2656 }
2658 if (IgnoreUnrecognizedVMOptions) {
2659 // uncast const to modify the flag args->ignoreUnrecognized
2660 *(jboolean*)(&args->ignoreUnrecognized) = true;
2661 }
2663 // Parse specified settings file
2664 if (settings_file_specified) {
2665 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2666 return JNI_EINVAL;
2667 }
2668 }
2670 // Parse default .hotspotrc settings file
2671 if (!settings_file_specified) {
2672 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2673 return JNI_EINVAL;
2674 }
2675 }
2677 if (PrintVMOptions) {
2678 for (index = 0; index < args->nOptions; index++) {
2679 const JavaVMOption *option = args->options + index;
2680 if (match_option(option, "-XX:", &tail)) {
2681 logOption(tail);
2682 }
2683 }
2684 }
2686 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2687 jint result = parse_vm_init_args(args);
2688 if (result != JNI_OK) {
2689 return result;
2690 }
2692 #ifndef PRODUCT
2693 if (TraceBytecodesAt != 0) {
2694 TraceBytecodes = true;
2695 }
2696 if (CountCompiledCalls) {
2697 if (UseCounterDecay) {
2698 warning("UseCounterDecay disabled because CountCalls is set");
2699 UseCounterDecay = false;
2700 }
2701 }
2702 #endif // PRODUCT
2704 if (EnableInvokeDynamic && !EnableMethodHandles) {
2705 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2706 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2707 }
2708 EnableMethodHandles = true;
2709 }
2710 if (EnableMethodHandles && !AnonymousClasses) {
2711 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2712 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2713 }
2714 AnonymousClasses = true;
2715 }
2716 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2717 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2718 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2719 }
2720 ScavengeRootsInCode = 1;
2721 }
2722 #ifdef COMPILER2
2723 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2724 // TODO: We need to find rules for invokedynamic and EA. For now,
2725 // simply disable EA by default.
2726 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2727 DoEscapeAnalysis = false;
2728 }
2729 }
2730 #endif
2732 if (PrintGCDetails) {
2733 // Turn on -verbose:gc options as well
2734 PrintGC = true;
2735 }
2737 #if defined(_LP64) && defined(COMPILER1)
2738 UseCompressedOops = false;
2739 #endif
2741 #ifdef SERIALGC
2742 force_serial_gc();
2743 #endif // SERIALGC
2744 #ifdef KERNEL
2745 no_shared_spaces();
2746 #endif // KERNEL
2748 // Set flags based on ergonomics.
2749 set_ergonomics_flags();
2751 #ifdef _LP64
2752 // XXX JSR 292 currently does not support compressed oops.
2753 if (EnableMethodHandles && UseCompressedOops) {
2754 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2755 UseCompressedOops = false;
2756 }
2757 }
2758 #endif // _LP64
2760 // Check the GC selections again.
2761 if (!check_gc_consistency()) {
2762 return JNI_EINVAL;
2763 }
2765 #ifndef KERNEL
2766 if (UseConcMarkSweepGC) {
2767 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
2768 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2769 // are true, we don't call set_parnew_gc_flags() as well.
2770 set_cms_and_parnew_gc_flags();
2771 } else {
2772 // Set heap size based on available physical memory
2773 set_heap_size();
2774 // Set per-collector flags
2775 if (UseParallelGC || UseParallelOldGC) {
2776 set_parallel_gc_flags();
2777 } else if (UseParNewGC) {
2778 set_parnew_gc_flags();
2779 } else if (UseG1GC) {
2780 set_g1_gc_flags();
2781 }
2782 }
2783 #endif // KERNEL
2785 #ifdef SERIALGC
2786 assert(verify_serial_gc_flags(), "SerialGC unset");
2787 #endif // SERIALGC
2789 // Set bytecode rewriting flags
2790 set_bytecode_flags();
2792 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2793 set_aggressive_opts_flags();
2795 #ifdef CC_INTERP
2796 // Clear flags not supported by the C++ interpreter
2797 FLAG_SET_DEFAULT(ProfileInterpreter, false);
2798 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2799 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
2800 #endif // CC_INTERP
2802 #ifdef ZERO
2803 // Clear flags not supported by Zero
2804 FLAG_SET_DEFAULT(TaggedStackInterpreter, false);
2805 #endif // ZERO
2807 #ifdef COMPILER2
2808 if (!UseBiasedLocking || EmitSync != 0) {
2809 UseOptoBiasInlining = false;
2810 }
2811 #endif
2813 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
2814 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
2815 DebugNonSafepoints = true;
2816 }
2818 if (PrintCommandLineFlags) {
2819 CommandLineFlags::printSetFlags();
2820 }
2822 if (PrintFlagsFinal) {
2823 CommandLineFlags::printFlags();
2824 }
2826 return JNI_OK;
2827 }
2829 int Arguments::PropertyList_count(SystemProperty* pl) {
2830 int count = 0;
2831 while(pl != NULL) {
2832 count++;
2833 pl = pl->next();
2834 }
2835 return count;
2836 }
2838 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2839 assert(key != NULL, "just checking");
2840 SystemProperty* prop;
2841 for (prop = pl; prop != NULL; prop = prop->next()) {
2842 if (strcmp(key, prop->key()) == 0) return prop->value();
2843 }
2844 return NULL;
2845 }
2847 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2848 int count = 0;
2849 const char* ret_val = NULL;
2851 while(pl != NULL) {
2852 if(count >= index) {
2853 ret_val = pl->key();
2854 break;
2855 }
2856 count++;
2857 pl = pl->next();
2858 }
2860 return ret_val;
2861 }
2863 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2864 int count = 0;
2865 char* ret_val = NULL;
2867 while(pl != NULL) {
2868 if(count >= index) {
2869 ret_val = pl->value();
2870 break;
2871 }
2872 count++;
2873 pl = pl->next();
2874 }
2876 return ret_val;
2877 }
2879 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2880 SystemProperty* p = *plist;
2881 if (p == NULL) {
2882 *plist = new_p;
2883 } else {
2884 while (p->next() != NULL) {
2885 p = p->next();
2886 }
2887 p->set_next(new_p);
2888 }
2889 }
2891 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2892 if (plist == NULL)
2893 return;
2895 SystemProperty* new_p = new SystemProperty(k, v, true);
2896 PropertyList_add(plist, new_p);
2897 }
2899 // This add maintains unique property key in the list.
2900 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
2901 if (plist == NULL)
2902 return;
2904 // If property key exist then update with new value.
2905 SystemProperty* prop;
2906 for (prop = *plist; prop != NULL; prop = prop->next()) {
2907 if (strcmp(k, prop->key()) == 0) {
2908 if (append) {
2909 prop->append_value(v);
2910 } else {
2911 prop->set_value(v);
2912 }
2913 return;
2914 }
2915 }
2917 PropertyList_add(plist, k, v);
2918 }
2920 #ifdef KERNEL
2921 char *Arguments::get_kernel_properties() {
2922 // Find properties starting with kernel and append them to string
2923 // We need to find out how long they are first because the URL's that they
2924 // might point to could get long.
2925 int length = 0;
2926 SystemProperty* prop;
2927 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2928 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2929 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2930 }
2931 }
2932 // Add one for null terminator.
2933 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2934 if (length != 0) {
2935 int pos = 0;
2936 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2937 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2938 jio_snprintf(&props[pos], length-pos,
2939 "-D%s=%s ", prop->key(), prop->value());
2940 pos = strlen(props);
2941 }
2942 }
2943 }
2944 // null terminate props in case of null
2945 props[length] = '\0';
2946 return props;
2947 }
2948 #endif // KERNEL
2950 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2951 // Returns true if all of the source pointed by src has been copied over to
2952 // the destination buffer pointed by buf. Otherwise, returns false.
2953 // Notes:
2954 // 1. If the length (buflen) of the destination buffer excluding the
2955 // NULL terminator character is not long enough for holding the expanded
2956 // pid characters, it also returns false instead of returning the partially
2957 // expanded one.
2958 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2959 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2960 char* buf, size_t buflen) {
2961 const char* p = src;
2962 char* b = buf;
2963 const char* src_end = &src[srclen];
2964 char* buf_end = &buf[buflen - 1];
2966 while (p < src_end && b < buf_end) {
2967 if (*p == '%') {
2968 switch (*(++p)) {
2969 case '%': // "%%" ==> "%"
2970 *b++ = *p++;
2971 break;
2972 case 'p': { // "%p" ==> current process id
2973 // buf_end points to the character before the last character so
2974 // that we could write '\0' to the end of the buffer.
2975 size_t buf_sz = buf_end - b + 1;
2976 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2978 // if jio_snprintf fails or the buffer is not long enough to hold
2979 // the expanded pid, returns false.
2980 if (ret < 0 || ret >= (int)buf_sz) {
2981 return false;
2982 } else {
2983 b += ret;
2984 assert(*b == '\0', "fail in copy_expand_pid");
2985 if (p == src_end && b == buf_end + 1) {
2986 // reach the end of the buffer.
2987 return true;
2988 }
2989 }
2990 p++;
2991 break;
2992 }
2993 default :
2994 *b++ = '%';
2995 }
2996 } else {
2997 *b++ = *p++;
2998 }
2999 }
3000 *b = '\0';
3001 return (p == src_end); // return false if not all of the source was copied
3002 }