Thu, 02 Apr 2009 18:17:03 -0400
Merge
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::_initial_heap_size = 0;
41 uintx Arguments::_min_heap_size = 0;
42 Arguments::Mode Arguments::_mode = _mixed;
43 bool Arguments::_java_compiler = false;
44 bool Arguments::_xdebug_mode = false;
45 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
46 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
47 int Arguments::_sun_java_launcher_pid = -1;
49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
50 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
51 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
52 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
53 bool Arguments::_ClipInlining = ClipInlining;
54 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
56 char* Arguments::SharedArchivePath = NULL;
58 AgentLibraryList Arguments::_libraryList;
59 AgentLibraryList Arguments::_agentList;
61 abort_hook_t Arguments::_abort_hook = NULL;
62 exit_hook_t Arguments::_exit_hook = NULL;
63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
66 SystemProperty *Arguments::_java_ext_dirs = NULL;
67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
69 SystemProperty *Arguments::_java_library_path = NULL;
70 SystemProperty *Arguments::_java_home = NULL;
71 SystemProperty *Arguments::_java_class_path = NULL;
72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
74 char* Arguments::_meta_index_path = NULL;
75 char* Arguments::_meta_index_dir = NULL;
77 static bool force_client_mode = false;
79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
81 static bool match_option(const JavaVMOption *option, const char* name,
82 const char** tail) {
83 int len = (int)strlen(name);
84 if (strncmp(option->optionString, name, len) == 0) {
85 *tail = option->optionString + len;
86 return true;
87 } else {
88 return false;
89 }
90 }
92 static void logOption(const char* opt) {
93 if (PrintVMOptions) {
94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 }
96 }
98 // Process java launcher properties.
99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
100 // See if sun.java.launcher or sun.java.launcher.pid is defined.
101 // Must do this before setting up other system properties,
102 // as some of them may depend on launcher type.
103 for (int index = 0; index < args->nOptions; index++) {
104 const JavaVMOption* option = args->options + index;
105 const char* tail;
107 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
108 process_java_launcher_argument(tail, option->extraInfo);
109 continue;
110 }
111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
112 _sun_java_launcher_pid = atoi(tail);
113 continue;
114 }
115 }
116 }
118 // Initialize system properties key and value.
119 void Arguments::init_system_properties() {
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
123 "Java Virtual Machine Specification", false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
125 "Sun Microsystems Inc.", false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
131 // following are JVMTI agent writeable properties.
132 // Properties values are set to NULL and they are
133 // os specific they are initialized in os::init_system_properties_values().
134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
137 _java_library_path = new SystemProperty("java.library.path", NULL, true);
138 _java_home = new SystemProperty("java.home", NULL, true);
139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
141 _java_class_path = new SystemProperty("java.class.path", "", true);
143 // Add to System Property list.
144 PropertyList_add(&_system_properties, _java_ext_dirs);
145 PropertyList_add(&_system_properties, _java_endorsed_dirs);
146 PropertyList_add(&_system_properties, _sun_boot_library_path);
147 PropertyList_add(&_system_properties, _java_library_path);
148 PropertyList_add(&_system_properties, _java_home);
149 PropertyList_add(&_system_properties, _java_class_path);
150 PropertyList_add(&_system_properties, _sun_boot_class_path);
152 // Set OS specific system properties values
153 os::init_system_properties_values();
154 }
156 /**
157 * Provide a slightly more user-friendly way of eliminating -XX flags.
158 * When a flag is eliminated, it can be added to this list in order to
159 * continue accepting this flag on the command-line, while issuing a warning
160 * and ignoring the value. Once the JDK version reaches the 'accept_until'
161 * limit, we flatly refuse to admit the existence of the flag. This allows
162 * a flag to die correctly over JDK releases using HSX.
163 */
164 typedef struct {
165 const char* name;
166 JDK_Version obsoleted_in; // when the flag went away
167 JDK_Version accept_until; // which version to start denying the existence
168 } ObsoleteFlag;
170 static ObsoleteFlag obsolete_jvm_flags[] = {
171 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
184 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
185 { NULL, JDK_Version(0), JDK_Version(0) }
186 };
188 // Returns true if the flag is obsolete and fits into the range specified
189 // for being ignored. In the case that the flag is ignored, the 'version'
190 // value is filled in with the version number when the flag became
191 // obsolete so that that value can be displayed to the user.
192 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
193 int i = 0;
194 assert(version != NULL, "Must provide a version buffer");
195 while (obsolete_jvm_flags[i].name != NULL) {
196 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
197 // <flag>=xxx form
198 // [-|+]<flag> form
199 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
200 ((s[0] == '+' || s[0] == '-') &&
201 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
202 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
203 *version = flag_status.obsoleted_in;
204 return true;
205 }
206 }
207 i++;
208 }
209 return false;
210 }
212 // Constructs the system class path (aka boot class path) from the following
213 // components, in order:
214 //
215 // prefix // from -Xbootclasspath/p:...
216 // endorsed // the expansion of -Djava.endorsed.dirs=...
217 // base // from os::get_system_properties() or -Xbootclasspath=
218 // suffix // from -Xbootclasspath/a:...
219 //
220 // java.endorsed.dirs is a list of directories; any jar or zip files in the
221 // directories are added to the sysclasspath just before the base.
222 //
223 // This could be AllStatic, but it isn't needed after argument processing is
224 // complete.
225 class SysClassPath: public StackObj {
226 public:
227 SysClassPath(const char* base);
228 ~SysClassPath();
230 inline void set_base(const char* base);
231 inline void add_prefix(const char* prefix);
232 inline void add_suffix_to_prefix(const char* suffix);
233 inline void add_suffix(const char* suffix);
234 inline void reset_path(const char* base);
236 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
237 // property. Must be called after all command-line arguments have been
238 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
239 // combined_path().
240 void expand_endorsed();
242 inline const char* get_base() const { return _items[_scp_base]; }
243 inline const char* get_prefix() const { return _items[_scp_prefix]; }
244 inline const char* get_suffix() const { return _items[_scp_suffix]; }
245 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
247 // Combine all the components into a single c-heap-allocated string; caller
248 // must free the string if/when no longer needed.
249 char* combined_path();
251 private:
252 // Utility routines.
253 static char* add_to_path(const char* path, const char* str, bool prepend);
254 static char* add_jars_to_path(char* path, const char* directory);
256 inline void reset_item_at(int index);
258 // Array indices for the items that make up the sysclasspath. All except the
259 // base are allocated in the C heap and freed by this class.
260 enum {
261 _scp_prefix, // from -Xbootclasspath/p:...
262 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
263 _scp_base, // the default sysclasspath
264 _scp_suffix, // from -Xbootclasspath/a:...
265 _scp_nitems // the number of items, must be last.
266 };
268 const char* _items[_scp_nitems];
269 DEBUG_ONLY(bool _expansion_done;)
270 };
272 SysClassPath::SysClassPath(const char* base) {
273 memset(_items, 0, sizeof(_items));
274 _items[_scp_base] = base;
275 DEBUG_ONLY(_expansion_done = false;)
276 }
278 SysClassPath::~SysClassPath() {
279 // Free everything except the base.
280 for (int i = 0; i < _scp_nitems; ++i) {
281 if (i != _scp_base) reset_item_at(i);
282 }
283 DEBUG_ONLY(_expansion_done = false;)
284 }
286 inline void SysClassPath::set_base(const char* base) {
287 _items[_scp_base] = base;
288 }
290 inline void SysClassPath::add_prefix(const char* prefix) {
291 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
292 }
294 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
295 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
296 }
298 inline void SysClassPath::add_suffix(const char* suffix) {
299 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
300 }
302 inline void SysClassPath::reset_item_at(int index) {
303 assert(index < _scp_nitems && index != _scp_base, "just checking");
304 if (_items[index] != NULL) {
305 FREE_C_HEAP_ARRAY(char, _items[index]);
306 _items[index] = NULL;
307 }
308 }
310 inline void SysClassPath::reset_path(const char* base) {
311 // Clear the prefix and suffix.
312 reset_item_at(_scp_prefix);
313 reset_item_at(_scp_suffix);
314 set_base(base);
315 }
317 //------------------------------------------------------------------------------
319 void SysClassPath::expand_endorsed() {
320 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
322 const char* path = Arguments::get_property("java.endorsed.dirs");
323 if (path == NULL) {
324 path = Arguments::get_endorsed_dir();
325 assert(path != NULL, "no default for java.endorsed.dirs");
326 }
328 char* expanded_path = NULL;
329 const char separator = *os::path_separator();
330 const char* const end = path + strlen(path);
331 while (path < end) {
332 const char* tmp_end = strchr(path, separator);
333 if (tmp_end == NULL) {
334 expanded_path = add_jars_to_path(expanded_path, path);
335 path = end;
336 } else {
337 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
338 memcpy(dirpath, path, tmp_end - path);
339 dirpath[tmp_end - path] = '\0';
340 expanded_path = add_jars_to_path(expanded_path, dirpath);
341 FREE_C_HEAP_ARRAY(char, dirpath);
342 path = tmp_end + 1;
343 }
344 }
345 _items[_scp_endorsed] = expanded_path;
346 DEBUG_ONLY(_expansion_done = true;)
347 }
349 // Combine the bootclasspath elements, some of which may be null, into a single
350 // c-heap-allocated string.
351 char* SysClassPath::combined_path() {
352 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
353 assert(_expansion_done, "must call expand_endorsed() first.");
355 size_t lengths[_scp_nitems];
356 size_t total_len = 0;
358 const char separator = *os::path_separator();
360 // Get the lengths.
361 int i;
362 for (i = 0; i < _scp_nitems; ++i) {
363 if (_items[i] != NULL) {
364 lengths[i] = strlen(_items[i]);
365 // Include space for the separator char (or a NULL for the last item).
366 total_len += lengths[i] + 1;
367 }
368 }
369 assert(total_len > 0, "empty sysclasspath not allowed");
371 // Copy the _items to a single string.
372 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
373 char* cp_tmp = cp;
374 for (i = 0; i < _scp_nitems; ++i) {
375 if (_items[i] != NULL) {
376 memcpy(cp_tmp, _items[i], lengths[i]);
377 cp_tmp += lengths[i];
378 *cp_tmp++ = separator;
379 }
380 }
381 *--cp_tmp = '\0'; // Replace the extra separator.
382 return cp;
383 }
385 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
386 char*
387 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
388 char *cp;
390 assert(str != NULL, "just checking");
391 if (path == NULL) {
392 size_t len = strlen(str) + 1;
393 cp = NEW_C_HEAP_ARRAY(char, len);
394 memcpy(cp, str, len); // copy the trailing null
395 } else {
396 const char separator = *os::path_separator();
397 size_t old_len = strlen(path);
398 size_t str_len = strlen(str);
399 size_t len = old_len + str_len + 2;
401 if (prepend) {
402 cp = NEW_C_HEAP_ARRAY(char, len);
403 char* cp_tmp = cp;
404 memcpy(cp_tmp, str, str_len);
405 cp_tmp += str_len;
406 *cp_tmp = separator;
407 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
408 FREE_C_HEAP_ARRAY(char, path);
409 } else {
410 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
411 char* cp_tmp = cp + old_len;
412 *cp_tmp = separator;
413 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
414 }
415 }
416 return cp;
417 }
419 // Scan the directory and append any jar or zip files found to path.
420 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
421 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
422 DIR* dir = os::opendir(directory);
423 if (dir == NULL) return path;
425 char dir_sep[2] = { '\0', '\0' };
426 size_t directory_len = strlen(directory);
427 const char fileSep = *os::file_separator();
428 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
430 /* Scan the directory for jars/zips, appending them to path. */
431 struct dirent *entry;
432 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
433 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
434 const char* name = entry->d_name;
435 const char* ext = name + strlen(name) - 4;
436 bool isJarOrZip = ext > name &&
437 (os::file_name_strcmp(ext, ".jar") == 0 ||
438 os::file_name_strcmp(ext, ".zip") == 0);
439 if (isJarOrZip) {
440 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
441 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
442 path = add_to_path(path, jarpath, false);
443 FREE_C_HEAP_ARRAY(char, jarpath);
444 }
445 }
446 FREE_C_HEAP_ARRAY(char, dbuf);
447 os::closedir(dir);
448 return path;
449 }
451 // Parses a memory size specification string.
452 static bool atomull(const char *s, julong* result) {
453 julong n = 0;
454 int args_read = sscanf(s, os::julong_format_specifier(), &n);
455 if (args_read != 1) {
456 return false;
457 }
458 while (*s != '\0' && isdigit(*s)) {
459 s++;
460 }
461 // 4705540: illegal if more characters are found after the first non-digit
462 if (strlen(s) > 1) {
463 return false;
464 }
465 switch (*s) {
466 case 'T': case 't':
467 *result = n * G * K;
468 // Check for overflow.
469 if (*result/((julong)G * K) != n) return false;
470 return true;
471 case 'G': case 'g':
472 *result = n * G;
473 if (*result/G != n) return false;
474 return true;
475 case 'M': case 'm':
476 *result = n * M;
477 if (*result/M != n) return false;
478 return true;
479 case 'K': case 'k':
480 *result = n * K;
481 if (*result/K != n) return false;
482 return true;
483 case '\0':
484 *result = n;
485 return true;
486 default:
487 return false;
488 }
489 }
491 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
492 if (size < min_size) return arg_too_small;
493 // Check that size will fit in a size_t (only relevant on 32-bit)
494 if (size > max_uintx) return arg_too_big;
495 return arg_in_range;
496 }
498 // Describe an argument out of range error
499 void Arguments::describe_range_error(ArgsRange errcode) {
500 switch(errcode) {
501 case arg_too_big:
502 jio_fprintf(defaultStream::error_stream(),
503 "The specified size exceeds the maximum "
504 "representable size.\n");
505 break;
506 case arg_too_small:
507 case arg_unreadable:
508 case arg_in_range:
509 // do nothing for now
510 break;
511 default:
512 ShouldNotReachHere();
513 }
514 }
516 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
517 return CommandLineFlags::boolAtPut(name, &value, origin);
518 }
520 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
521 double v;
522 if (sscanf(value, "%lf", &v) != 1) {
523 return false;
524 }
526 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
527 return true;
528 }
529 return false;
530 }
532 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
533 julong v;
534 intx intx_v;
535 bool is_neg = false;
536 // Check the sign first since atomull() parses only unsigned values.
537 if (*value == '-') {
538 if (!CommandLineFlags::intxAt(name, &intx_v)) {
539 return false;
540 }
541 value++;
542 is_neg = true;
543 }
544 if (!atomull(value, &v)) {
545 return false;
546 }
547 intx_v = (intx) v;
548 if (is_neg) {
549 intx_v = -intx_v;
550 }
551 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
552 return true;
553 }
554 uintx uintx_v = (uintx) v;
555 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
556 return true;
557 }
558 return false;
559 }
561 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
562 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
563 // Contract: CommandLineFlags always returns a pointer that needs freeing.
564 FREE_C_HEAP_ARRAY(char, value);
565 return true;
566 }
568 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
569 const char* old_value = "";
570 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
571 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
572 size_t new_len = strlen(new_value);
573 const char* value;
574 char* free_this_too = NULL;
575 if (old_len == 0) {
576 value = new_value;
577 } else if (new_len == 0) {
578 value = old_value;
579 } else {
580 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
581 // each new setting adds another LINE to the switch:
582 sprintf(buf, "%s\n%s", old_value, new_value);
583 value = buf;
584 free_this_too = buf;
585 }
586 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
587 // CommandLineFlags always returns a pointer that needs freeing.
588 FREE_C_HEAP_ARRAY(char, value);
589 if (free_this_too != NULL) {
590 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
591 FREE_C_HEAP_ARRAY(char, free_this_too);
592 }
593 return true;
594 }
596 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
598 // range of acceptable characters spelled out for portability reasons
599 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
600 #define BUFLEN 255
601 char name[BUFLEN+1];
602 char dummy;
604 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
605 return set_bool_flag(name, false, origin);
606 }
607 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
608 return set_bool_flag(name, true, origin);
609 }
611 char punct;
612 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
613 const char* value = strchr(arg, '=') + 1;
614 Flag* flag = Flag::find_flag(name, strlen(name));
615 if (flag != NULL && flag->is_ccstr()) {
616 if (flag->ccstr_accumulates()) {
617 return append_to_string_flag(name, value, origin);
618 } else {
619 if (value[0] == '\0') {
620 value = NULL;
621 }
622 return set_string_flag(name, value, origin);
623 }
624 }
625 }
627 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
628 const char* value = strchr(arg, '=') + 1;
629 // -XX:Foo:=xxx will reset the string flag to the given value.
630 if (value[0] == '\0') {
631 value = NULL;
632 }
633 return set_string_flag(name, value, origin);
634 }
636 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
637 #define SIGNED_NUMBER_RANGE "[-0123456789]"
638 #define NUMBER_RANGE "[0123456789]"
639 char value[BUFLEN + 1];
640 char value2[BUFLEN + 1];
641 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
642 // Looks like a floating-point number -- try again with more lenient format string
643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
644 return set_fp_numeric_flag(name, value, origin);
645 }
646 }
648 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
650 return set_numeric_flag(name, value, origin);
651 }
653 return false;
654 }
656 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
657 assert(bldarray != NULL, "illegal argument");
659 if (arg == NULL) {
660 return;
661 }
663 int index = *count;
665 // expand the array and add arg to the last element
666 (*count)++;
667 if (*bldarray == NULL) {
668 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
669 } else {
670 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
671 }
672 (*bldarray)[index] = strdup(arg);
673 }
675 void Arguments::build_jvm_args(const char* arg) {
676 add_string(&_jvm_args_array, &_num_jvm_args, arg);
677 }
679 void Arguments::build_jvm_flags(const char* arg) {
680 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
681 }
683 // utility function to return a string that concatenates all
684 // strings in a given char** array
685 const char* Arguments::build_resource_string(char** args, int count) {
686 if (args == NULL || count == 0) {
687 return NULL;
688 }
689 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
690 for (int i = 1; i < count; i++) {
691 length += strlen(args[i]) + 1; // add 1 for a space
692 }
693 char* s = NEW_RESOURCE_ARRAY(char, length);
694 strcpy(s, args[0]);
695 for (int j = 1; j < count; j++) {
696 strcat(s, " ");
697 strcat(s, args[j]);
698 }
699 return (const char*) s;
700 }
702 void Arguments::print_on(outputStream* st) {
703 st->print_cr("VM Arguments:");
704 if (num_jvm_flags() > 0) {
705 st->print("jvm_flags: "); print_jvm_flags_on(st);
706 }
707 if (num_jvm_args() > 0) {
708 st->print("jvm_args: "); print_jvm_args_on(st);
709 }
710 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
711 st->print_cr("Launcher Type: %s", _sun_java_launcher);
712 }
714 void Arguments::print_jvm_flags_on(outputStream* st) {
715 if (_num_jvm_flags > 0) {
716 for (int i=0; i < _num_jvm_flags; i++) {
717 st->print("%s ", _jvm_flags_array[i]);
718 }
719 st->print_cr("");
720 }
721 }
723 void Arguments::print_jvm_args_on(outputStream* st) {
724 if (_num_jvm_args > 0) {
725 for (int i=0; i < _num_jvm_args; i++) {
726 st->print("%s ", _jvm_args_array[i]);
727 }
728 st->print_cr("");
729 }
730 }
732 bool Arguments::process_argument(const char* arg,
733 jboolean ignore_unrecognized, FlagValueOrigin origin) {
735 JDK_Version since = JDK_Version();
737 if (parse_argument(arg, origin)) {
738 // do nothing
739 } else if (is_newly_obsolete(arg, &since)) {
740 enum { bufsize = 256 };
741 char buffer[bufsize];
742 since.to_string(buffer, bufsize);
743 jio_fprintf(defaultStream::error_stream(),
744 "Warning: The flag %s has been EOL'd as of %s and will"
745 " be ignored\n", arg, buffer);
746 } else {
747 if (!ignore_unrecognized) {
748 jio_fprintf(defaultStream::error_stream(),
749 "Unrecognized VM option '%s'\n", arg);
750 // allow for commandline "commenting out" options like -XX:#+Verbose
751 if (strlen(arg) == 0 || arg[0] != '#') {
752 return false;
753 }
754 }
755 }
756 return true;
757 }
759 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
760 FILE* stream = fopen(file_name, "rb");
761 if (stream == NULL) {
762 if (should_exist) {
763 jio_fprintf(defaultStream::error_stream(),
764 "Could not open settings file %s\n", file_name);
765 return false;
766 } else {
767 return true;
768 }
769 }
771 char token[1024];
772 int pos = 0;
774 bool in_white_space = true;
775 bool in_comment = false;
776 bool in_quote = false;
777 char quote_c = 0;
778 bool result = true;
780 int c = getc(stream);
781 while(c != EOF) {
782 if (in_white_space) {
783 if (in_comment) {
784 if (c == '\n') in_comment = false;
785 } else {
786 if (c == '#') in_comment = true;
787 else if (!isspace(c)) {
788 in_white_space = false;
789 token[pos++] = c;
790 }
791 }
792 } else {
793 if (c == '\n' || (!in_quote && isspace(c))) {
794 // token ends at newline, or at unquoted whitespace
795 // this allows a way to include spaces in string-valued options
796 token[pos] = '\0';
797 logOption(token);
798 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
799 build_jvm_flags(token);
800 pos = 0;
801 in_white_space = true;
802 in_quote = false;
803 } else if (!in_quote && (c == '\'' || c == '"')) {
804 in_quote = true;
805 quote_c = c;
806 } else if (in_quote && (c == quote_c)) {
807 in_quote = false;
808 } else {
809 token[pos++] = c;
810 }
811 }
812 c = getc(stream);
813 }
814 if (pos > 0) {
815 token[pos] = '\0';
816 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
817 build_jvm_flags(token);
818 }
819 fclose(stream);
820 return result;
821 }
823 //=============================================================================================================
824 // Parsing of properties (-D)
826 const char* Arguments::get_property(const char* key) {
827 return PropertyList_get_value(system_properties(), key);
828 }
830 bool Arguments::add_property(const char* prop) {
831 const char* eq = strchr(prop, '=');
832 char* key;
833 // ns must be static--its address may be stored in a SystemProperty object.
834 const static char ns[1] = {0};
835 char* value = (char *)ns;
837 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
838 key = AllocateHeap(key_len + 1, "add_property");
839 strncpy(key, prop, key_len);
840 key[key_len] = '\0';
842 if (eq != NULL) {
843 size_t value_len = strlen(prop) - key_len - 1;
844 value = AllocateHeap(value_len + 1, "add_property");
845 strncpy(value, &prop[key_len + 1], value_len + 1);
846 }
848 if (strcmp(key, "java.compiler") == 0) {
849 process_java_compiler_argument(value);
850 FreeHeap(key);
851 if (eq != NULL) {
852 FreeHeap(value);
853 }
854 return true;
855 } else if (strcmp(key, "sun.java.command") == 0) {
856 _java_command = value;
858 // don't add this property to the properties exposed to the java application
859 FreeHeap(key);
860 return true;
861 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
862 // launcher.pid property is private and is processed
863 // in process_sun_java_launcher_properties();
864 // the sun.java.launcher property is passed on to the java application
865 FreeHeap(key);
866 if (eq != NULL) {
867 FreeHeap(value);
868 }
869 return true;
870 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
871 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
872 // its value without going through the property list or making a Java call.
873 _java_vendor_url_bug = value;
874 } else if (strcmp(key, "sun.boot.library.path") == 0) {
875 PropertyList_unique_add(&_system_properties, key, value, true);
876 return true;
877 }
878 // Create new property and add at the end of the list
879 PropertyList_unique_add(&_system_properties, key, value);
880 return true;
881 }
883 //===========================================================================================================
884 // Setting int/mixed/comp mode flags
886 void Arguments::set_mode_flags(Mode mode) {
887 // Set up default values for all flags.
888 // If you add a flag to any of the branches below,
889 // add a default value for it here.
890 set_java_compiler(false);
891 _mode = mode;
893 // Ensure Agent_OnLoad has the correct initial values.
894 // This may not be the final mode; mode may change later in onload phase.
895 PropertyList_unique_add(&_system_properties, "java.vm.info",
896 (char*)Abstract_VM_Version::vm_info_string(), false);
898 UseInterpreter = true;
899 UseCompiler = true;
900 UseLoopCounter = true;
902 // Default values may be platform/compiler dependent -
903 // use the saved values
904 ClipInlining = Arguments::_ClipInlining;
905 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
906 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
907 BackgroundCompilation = Arguments::_BackgroundCompilation;
908 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
910 // Change from defaults based on mode
911 switch (mode) {
912 default:
913 ShouldNotReachHere();
914 break;
915 case _int:
916 UseCompiler = false;
917 UseLoopCounter = false;
918 AlwaysCompileLoopMethods = false;
919 UseOnStackReplacement = false;
920 break;
921 case _mixed:
922 // same as default
923 break;
924 case _comp:
925 UseInterpreter = false;
926 BackgroundCompilation = false;
927 ClipInlining = false;
928 break;
929 }
930 }
932 // Conflict: required to use shared spaces (-Xshare:on), but
933 // incompatible command line options were chosen.
935 static void no_shared_spaces() {
936 if (RequireSharedSpaces) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Class data sharing is inconsistent with other specified options.\n");
939 vm_exit_during_initialization("Unable to use shared archive.", NULL);
940 } else {
941 FLAG_SET_DEFAULT(UseSharedSpaces, false);
942 }
943 }
945 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
946 // if it's not explictly set or unset. If the user has chosen
947 // UseParNewGC and not explicitly set ParallelGCThreads we
948 // set it, unless this is a single cpu machine.
949 void Arguments::set_parnew_gc_flags() {
950 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
951 "control point invariant");
952 assert(UseParNewGC, "Error");
954 // Turn off AdaptiveSizePolicy by default for parnew until it is
955 // complete.
956 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
957 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
958 }
960 if (ParallelGCThreads == 0) {
961 FLAG_SET_DEFAULT(ParallelGCThreads,
962 Abstract_VM_Version::parallel_worker_threads());
963 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
964 FLAG_SET_DEFAULT(UseParNewGC, false);
965 }
966 }
967 if (!UseParNewGC) {
968 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
969 } else {
970 no_shared_spaces();
972 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
973 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
974 // we set them to 1024 and 1024.
975 // See CR 6362902.
976 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
977 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
978 }
979 if (FLAG_IS_DEFAULT(OldPLABSize)) {
980 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
981 }
983 // AlwaysTenure flag should make ParNew to promote all at first collection.
984 // See CR 6362902.
985 if (AlwaysTenure) {
986 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
987 }
988 }
989 }
991 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
992 // sparc/solaris for certain applications, but would gain from
993 // further optimization and tuning efforts, and would almost
994 // certainly gain from analysis of platform and environment.
995 void Arguments::set_cms_and_parnew_gc_flags() {
996 assert(!UseSerialGC && !UseParallelGC, "Error");
997 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
999 // If we are using CMS, we prefer to UseParNewGC,
1000 // unless explicitly forbidden.
1001 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1002 FLAG_SET_ERGO(bool, UseParNewGC, true);
1003 }
1005 // Turn off AdaptiveSizePolicy by default for cms until it is
1006 // complete.
1007 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1008 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1009 }
1011 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1012 // as needed.
1013 if (UseParNewGC) {
1014 set_parnew_gc_flags();
1015 }
1017 // Now make adjustments for CMS
1018 size_t young_gen_per_worker;
1019 intx new_ratio;
1020 size_t min_new_default;
1021 intx tenuring_default;
1022 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1023 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1024 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1025 }
1026 young_gen_per_worker = 4*M;
1027 new_ratio = (intx)15;
1028 min_new_default = 4*M;
1029 tenuring_default = (intx)0;
1030 } else { // new defaults: "new" as of 6.0
1031 young_gen_per_worker = CMSYoungGenPerWorker;
1032 new_ratio = (intx)7;
1033 min_new_default = 16*M;
1034 tenuring_default = (intx)4;
1035 }
1037 // Preferred young gen size for "short" pauses
1038 const uintx parallel_gc_threads =
1039 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1040 const size_t preferred_max_new_size_unaligned =
1041 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1042 const size_t preferred_max_new_size =
1043 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1045 // Unless explicitly requested otherwise, size young gen
1046 // for "short" pauses ~ 4M*ParallelGCThreads
1047 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1048 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1049 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1050 } else {
1051 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1052 }
1053 if(PrintGCDetails && Verbose) {
1054 // Too early to use gclog_or_tty
1055 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1056 }
1057 }
1058 // Unless explicitly requested otherwise, prefer a large
1059 // Old to Young gen size so as to shift the collection load
1060 // to the old generation concurrent collector
1061 if (FLAG_IS_DEFAULT(NewRatio)) {
1062 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1064 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1065 size_t prev_initial_size = initial_heap_size();
1066 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1067 set_initial_heap_size(min_new+OldSize);
1068 // Currently minimum size and the initial heap sizes are the same.
1069 set_min_heap_size(initial_heap_size());
1070 if (PrintGCDetails && Verbose) {
1071 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1072 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1073 initial_heap_size()/M, prev_initial_size/M);
1074 }
1075 }
1076 // MaxHeapSize is aligned down in collectorPolicy
1077 size_t max_heap = align_size_down(MaxHeapSize,
1078 CardTableRS::ct_max_alignment_constraint());
1080 if(PrintGCDetails && Verbose) {
1081 // Too early to use gclog_or_tty
1082 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1083 " initial_heap_size: " SIZE_FORMAT
1084 " max_heap: " SIZE_FORMAT,
1085 min_heap_size(), initial_heap_size(), max_heap);
1086 }
1087 if (max_heap > min_new) {
1088 // Unless explicitly requested otherwise, make young gen
1089 // at least min_new, and at most preferred_max_new_size.
1090 if (FLAG_IS_DEFAULT(NewSize)) {
1091 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1092 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1093 if(PrintGCDetails && Verbose) {
1094 // Too early to use gclog_or_tty
1095 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1096 }
1097 }
1098 // Unless explicitly requested otherwise, size old gen
1099 // so that it's at least 3X of NewSize to begin with;
1100 // later NewRatio will decide how it grows; see above.
1101 if (FLAG_IS_DEFAULT(OldSize)) {
1102 if (max_heap > NewSize) {
1103 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1104 if(PrintGCDetails && Verbose) {
1105 // Too early to use gclog_or_tty
1106 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1107 }
1108 }
1109 }
1110 }
1111 }
1112 // Unless explicitly requested otherwise, definitely
1113 // promote all objects surviving "tenuring_default" scavenges.
1114 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1115 FLAG_IS_DEFAULT(SurvivorRatio)) {
1116 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1117 }
1118 // If we decided above (or user explicitly requested)
1119 // `promote all' (via MaxTenuringThreshold := 0),
1120 // prefer minuscule survivor spaces so as not to waste
1121 // space for (non-existent) survivors
1122 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1123 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1124 }
1125 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1126 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1127 // This is done in order to make ParNew+CMS configuration to work
1128 // with YoungPLABSize and OldPLABSize options.
1129 // See CR 6362902.
1130 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1131 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1132 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1133 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1134 // the value (either from the command line or ergonomics) of
1135 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1136 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1137 }
1138 else {
1139 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1140 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1141 // we'll let it to take precedence.
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1144 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1145 }
1146 }
1147 }
1149 inline uintx max_heap_for_compressed_oops() {
1150 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1151 NOT_LP64(return DefaultMaxRAM);
1152 }
1154 bool Arguments::should_auto_select_low_pause_collector() {
1155 if (UseAutoGCSelectPolicy &&
1156 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1157 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1158 if (PrintGCDetails) {
1159 // Cannot use gclog_or_tty yet.
1160 tty->print_cr("Automatic selection of the low pause collector"
1161 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1162 }
1163 return true;
1164 }
1165 return false;
1166 }
1168 void Arguments::set_ergonomics_flags() {
1169 // Parallel GC is not compatible with sharing. If one specifies
1170 // that they want sharing explicitly, do not set ergonmics flags.
1171 if (DumpSharedSpaces || ForceSharedSpaces) {
1172 return;
1173 }
1175 if (os::is_server_class_machine() && !force_client_mode ) {
1176 // If no other collector is requested explicitly,
1177 // let the VM select the collector based on
1178 // machine class and automatic selection policy.
1179 if (!UseSerialGC &&
1180 !UseConcMarkSweepGC &&
1181 !UseG1GC &&
1182 !UseParNewGC &&
1183 !DumpSharedSpaces &&
1184 FLAG_IS_DEFAULT(UseParallelGC)) {
1185 if (should_auto_select_low_pause_collector()) {
1186 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1187 } else {
1188 FLAG_SET_ERGO(bool, UseParallelGC, true);
1189 }
1190 no_shared_spaces();
1191 }
1192 }
1194 #ifdef _LP64
1195 // Compressed Headers do not work with CMS, which uses a bit in the klass
1196 // field offset to determine free list chunk markers.
1197 // Check that UseCompressedOops can be set with the max heap size allocated
1198 // by ergonomics.
1199 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1200 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1201 // Turn off until bug is fixed.
1202 // the following line to return it to default status.
1203 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1204 } else if (UseCompressedOops && UseG1GC) {
1205 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
1206 FLAG_SET_DEFAULT(UseCompressedOops, false);
1207 }
1208 #ifdef _WIN64
1209 if (UseLargePages && UseCompressedOops) {
1210 // Cannot allocate guard pages for implicit checks in indexed addressing
1211 // mode, when large pages are specified on windows.
1212 // This flag could be switched ON if narrow oop base address is set to 0,
1213 // see code in Universe::initialize_heap().
1214 Universe::set_narrow_oop_use_implicit_null_checks(false);
1215 }
1216 #endif // _WIN64
1217 } else {
1218 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1219 warning("Max heap size too large for Compressed Oops");
1220 FLAG_SET_DEFAULT(UseCompressedOops, false);
1221 }
1222 }
1223 // Also checks that certain machines are slower with compressed oops
1224 // in vm_version initialization code.
1225 #endif // _LP64
1226 }
1228 void Arguments::set_parallel_gc_flags() {
1229 assert(UseParallelGC || UseParallelOldGC, "Error");
1230 // If parallel old was requested, automatically enable parallel scavenge.
1231 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1232 FLAG_SET_DEFAULT(UseParallelGC, true);
1233 }
1235 // If no heap maximum was requested explicitly, use some reasonable fraction
1236 // of the physical memory, up to a maximum of 1GB.
1237 if (UseParallelGC) {
1238 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1239 Abstract_VM_Version::parallel_worker_threads());
1241 // PS is a server collector, setup the heap sizes accordingly.
1242 set_server_heap_size();
1243 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1244 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1245 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1246 // See CR 6362902 for details.
1247 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1248 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1249 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1250 }
1251 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1252 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1253 }
1254 }
1256 if (UseParallelOldGC) {
1257 // Par compact uses lower default values since they are treated as
1258 // minimums. These are different defaults because of the different
1259 // interpretation and are not ergonomically set.
1260 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1261 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1262 }
1263 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1264 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1265 }
1266 }
1267 }
1268 }
1270 void Arguments::set_g1_gc_flags() {
1271 assert(UseG1GC, "Error");
1272 // G1 is a server collector, setup the heap sizes accordingly.
1273 set_server_heap_size();
1274 #ifdef COMPILER1
1275 FastTLABRefill = false;
1276 #endif
1277 FLAG_SET_DEFAULT(ParallelGCThreads,
1278 Abstract_VM_Version::parallel_worker_threads());
1279 if (ParallelGCThreads == 0) {
1280 FLAG_SET_DEFAULT(ParallelGCThreads,
1281 Abstract_VM_Version::parallel_worker_threads
1282 ());
1283 }
1284 no_shared_spaces();
1285 }
1287 void Arguments::set_server_heap_size() {
1288 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1289 const uint64_t reasonable_fraction =
1290 os::physical_memory() / DefaultMaxRAMFraction;
1291 const uint64_t maximum_size = (uint64_t)
1292 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1293 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1294 DefaultMaxRAM);
1295 size_t reasonable_max =
1296 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1297 if (reasonable_max > maximum_size) {
1298 reasonable_max = maximum_size;
1299 }
1300 if (PrintGCDetails && Verbose) {
1301 // Cannot use gclog_or_tty yet.
1302 tty->print_cr(" Max heap size for server class platform "
1303 SIZE_FORMAT, reasonable_max);
1304 }
1305 // If the initial_heap_size has not been set with -Xms,
1306 // then set it as fraction of size of physical memory
1307 // respecting the maximum and minimum sizes of the heap.
1308 if (initial_heap_size() == 0) {
1309 const uint64_t reasonable_initial_fraction =
1310 os::physical_memory() / DefaultInitialRAMFraction;
1311 const size_t reasonable_initial =
1312 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1313 const size_t minimum_size = NewSize + OldSize;
1314 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1315 minimum_size));
1316 // Currently the minimum size and the initial heap sizes are the same.
1317 set_min_heap_size(initial_heap_size());
1318 if (PrintGCDetails && Verbose) {
1319 // Cannot use gclog_or_tty yet.
1320 tty->print_cr(" Initial heap size for server class platform "
1321 SIZE_FORMAT, initial_heap_size());
1322 }
1323 } else {
1324 // A minimum size was specified on the command line. Be sure
1325 // that the maximum size is consistent.
1326 if (initial_heap_size() > reasonable_max) {
1327 reasonable_max = initial_heap_size();
1328 }
1329 }
1330 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1331 }
1332 }
1334 // This must be called after ergonomics because we want bytecode rewriting
1335 // if the server compiler is used, or if UseSharedSpaces is disabled.
1336 void Arguments::set_bytecode_flags() {
1337 // Better not attempt to store into a read-only space.
1338 if (UseSharedSpaces) {
1339 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1340 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1341 }
1343 if (!RewriteBytecodes) {
1344 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1345 }
1346 }
1348 // Aggressive optimization flags -XX:+AggressiveOpts
1349 void Arguments::set_aggressive_opts_flags() {
1350 #ifdef COMPILER2
1351 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1352 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1353 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1354 }
1355 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1356 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1357 }
1359 // Feed the cache size setting into the JDK
1360 char buffer[1024];
1361 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1362 add_property(buffer);
1363 }
1364 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1365 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1366 }
1367 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1368 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1369 }
1370 #endif
1372 if (AggressiveOpts) {
1373 // Sample flag setting code
1374 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1375 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1376 // }
1377 }
1378 }
1380 //===========================================================================================================
1381 // Parsing of java.compiler property
1383 void Arguments::process_java_compiler_argument(char* arg) {
1384 // For backwards compatibility, Djava.compiler=NONE or ""
1385 // causes us to switch to -Xint mode UNLESS -Xdebug
1386 // is also specified.
1387 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1388 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1389 }
1390 }
1392 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1393 _sun_java_launcher = strdup(launcher);
1394 }
1396 bool Arguments::created_by_java_launcher() {
1397 assert(_sun_java_launcher != NULL, "property must have value");
1398 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1399 }
1401 //===========================================================================================================
1402 // Parsing of main arguments
1404 bool Arguments::verify_percentage(uintx value, const char* name) {
1405 if (value <= 100) {
1406 return true;
1407 }
1408 jio_fprintf(defaultStream::error_stream(),
1409 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1410 name, value);
1411 return false;
1412 }
1414 static void set_serial_gc_flags() {
1415 FLAG_SET_DEFAULT(UseSerialGC, true);
1416 FLAG_SET_DEFAULT(UseParNewGC, false);
1417 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1418 FLAG_SET_DEFAULT(UseParallelGC, false);
1419 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1420 FLAG_SET_DEFAULT(UseG1GC, false);
1421 }
1423 static bool verify_serial_gc_flags() {
1424 return (UseSerialGC &&
1425 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC ||
1426 UseParallelGC || UseParallelOldGC));
1427 }
1429 // Check consistency of GC selection
1430 bool Arguments::check_gc_consistency() {
1431 bool status = true;
1432 // Ensure that the user has not selected conflicting sets
1433 // of collectors. [Note: this check is merely a user convenience;
1434 // collectors over-ride each other so that only a non-conflicting
1435 // set is selected; however what the user gets is not what they
1436 // may have expected from the combination they asked for. It's
1437 // better to reduce user confusion by not allowing them to
1438 // select conflicting combinations.
1439 uint i = 0;
1440 if (UseSerialGC) i++;
1441 if (UseConcMarkSweepGC || UseParNewGC) i++;
1442 if (UseParallelGC || UseParallelOldGC) i++;
1443 if (i > 1) {
1444 jio_fprintf(defaultStream::error_stream(),
1445 "Conflicting collector combinations in option list; "
1446 "please refer to the release notes for the combinations "
1447 "allowed\n");
1448 status = false;
1449 }
1451 return status;
1452 }
1454 // Check the consistency of vm_init_args
1455 bool Arguments::check_vm_args_consistency() {
1456 // Method for adding checks for flag consistency.
1457 // The intent is to warn the user of all possible conflicts,
1458 // before returning an error.
1459 // Note: Needs platform-dependent factoring.
1460 bool status = true;
1462 #if ( (defined(COMPILER2) && defined(SPARC)))
1463 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1464 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1465 // x86. Normally, VM_Version_init must be called from init_globals in
1466 // init.cpp, which is called by the initial java thread *after* arguments
1467 // have been parsed. VM_Version_init gets called twice on sparc.
1468 extern void VM_Version_init();
1469 VM_Version_init();
1470 if (!VM_Version::has_v9()) {
1471 jio_fprintf(defaultStream::error_stream(),
1472 "V8 Machine detected, Server requires V9\n");
1473 status = false;
1474 }
1475 #endif /* COMPILER2 && SPARC */
1477 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1478 // builds so the cost of stack banging can be measured.
1479 #if (defined(PRODUCT) && defined(SOLARIS))
1480 if (!UseBoundThreads && !UseStackBanging) {
1481 jio_fprintf(defaultStream::error_stream(),
1482 "-UseStackBanging conflicts with -UseBoundThreads\n");
1484 status = false;
1485 }
1486 #endif
1488 if (TLABRefillWasteFraction == 0) {
1489 jio_fprintf(defaultStream::error_stream(),
1490 "TLABRefillWasteFraction should be a denominator, "
1491 "not " SIZE_FORMAT "\n",
1492 TLABRefillWasteFraction);
1493 status = false;
1494 }
1496 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1497 "MaxLiveObjectEvacuationRatio");
1498 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1499 "AdaptiveSizePolicyWeight");
1500 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1501 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1502 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1503 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1505 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1506 jio_fprintf(defaultStream::error_stream(),
1507 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1508 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1509 MinHeapFreeRatio, MaxHeapFreeRatio);
1510 status = false;
1511 }
1512 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1513 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1515 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1516 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1517 }
1519 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1520 // Settings to encourage splitting.
1521 if (!FLAG_IS_CMDLINE(NewRatio)) {
1522 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1523 }
1524 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1525 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1526 }
1527 }
1529 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1530 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1531 if (GCTimeLimit == 100) {
1532 // Turn off gc-overhead-limit-exceeded checks
1533 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1534 }
1536 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1538 // Check user specified sharing option conflict with Parallel GC
1539 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC ||
1540 UseParallelGC || UseParallelOldGC ||
1541 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1543 if (cannot_share) {
1544 // Either force sharing on by forcing the other options off, or
1545 // force sharing off.
1546 if (DumpSharedSpaces || ForceSharedSpaces) {
1547 set_serial_gc_flags();
1548 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1549 } else {
1550 no_shared_spaces();
1551 }
1552 }
1554 status = status && check_gc_consistency();
1556 if (_has_alloc_profile) {
1557 if (UseParallelGC || UseParallelOldGC) {
1558 jio_fprintf(defaultStream::error_stream(),
1559 "error: invalid argument combination.\n"
1560 "Allocation profiling (-Xaprof) cannot be used together with "
1561 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1562 status = false;
1563 }
1564 if (UseConcMarkSweepGC) {
1565 jio_fprintf(defaultStream::error_stream(),
1566 "error: invalid argument combination.\n"
1567 "Allocation profiling (-Xaprof) cannot be used together with "
1568 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1569 status = false;
1570 }
1571 }
1573 if (CMSIncrementalMode) {
1574 if (!UseConcMarkSweepGC) {
1575 jio_fprintf(defaultStream::error_stream(),
1576 "error: invalid argument combination.\n"
1577 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1578 "selected in order\nto use CMSIncrementalMode.\n");
1579 status = false;
1580 } else {
1581 status = status && verify_percentage(CMSIncrementalDutyCycle,
1582 "CMSIncrementalDutyCycle");
1583 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1584 "CMSIncrementalDutyCycleMin");
1585 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1586 "CMSIncrementalSafetyFactor");
1587 status = status && verify_percentage(CMSIncrementalOffset,
1588 "CMSIncrementalOffset");
1589 status = status && verify_percentage(CMSExpAvgFactor,
1590 "CMSExpAvgFactor");
1591 // If it was not set on the command line, set
1592 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1593 if (CMSInitiatingOccupancyFraction < 0) {
1594 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1595 }
1596 }
1597 }
1599 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1600 // insists that we hold the requisite locks so that the iteration is
1601 // MT-safe. For the verification at start-up and shut-down, we don't
1602 // yet have a good way of acquiring and releasing these locks,
1603 // which are not visible at the CollectedHeap level. We want to
1604 // be able to acquire these locks and then do the iteration rather
1605 // than just disable the lock verification. This will be fixed under
1606 // bug 4788986.
1607 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1608 if (VerifyGCStartAt == 0) {
1609 warning("Heap verification at start-up disabled "
1610 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1611 VerifyGCStartAt = 1; // Disable verification at start-up
1612 }
1613 if (VerifyBeforeExit) {
1614 warning("Heap verification at shutdown disabled "
1615 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1616 VerifyBeforeExit = false; // Disable verification at shutdown
1617 }
1618 }
1620 // Note: only executed in non-PRODUCT mode
1621 if (!UseAsyncConcMarkSweepGC &&
1622 (ExplicitGCInvokesConcurrent ||
1623 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1624 jio_fprintf(defaultStream::error_stream(),
1625 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1626 " with -UseAsyncConcMarkSweepGC");
1627 status = false;
1628 }
1630 return status;
1631 }
1633 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1634 const char* option_type) {
1635 if (ignore) return false;
1637 const char* spacer = " ";
1638 if (option_type == NULL) {
1639 option_type = ++spacer; // Set both to the empty string.
1640 }
1642 if (os::obsolete_option(option)) {
1643 jio_fprintf(defaultStream::error_stream(),
1644 "Obsolete %s%soption: %s\n", option_type, spacer,
1645 option->optionString);
1646 return false;
1647 } else {
1648 jio_fprintf(defaultStream::error_stream(),
1649 "Unrecognized %s%soption: %s\n", option_type, spacer,
1650 option->optionString);
1651 return true;
1652 }
1653 }
1655 static const char* user_assertion_options[] = {
1656 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1657 };
1659 static const char* system_assertion_options[] = {
1660 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1661 };
1663 // Return true if any of the strings in null-terminated array 'names' matches.
1664 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1665 // the option must match exactly.
1666 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1667 bool tail_allowed) {
1668 for (/* empty */; *names != NULL; ++names) {
1669 if (match_option(option, *names, tail)) {
1670 if (**tail == '\0' || tail_allowed && **tail == ':') {
1671 return true;
1672 }
1673 }
1674 }
1675 return false;
1676 }
1678 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1679 julong* long_arg,
1680 julong min_size) {
1681 if (!atomull(s, long_arg)) return arg_unreadable;
1682 return check_memory_size(*long_arg, min_size);
1683 }
1685 // Parse JavaVMInitArgs structure
1687 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1688 // For components of the system classpath.
1689 SysClassPath scp(Arguments::get_sysclasspath());
1690 bool scp_assembly_required = false;
1692 // Save default settings for some mode flags
1693 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1694 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1695 Arguments::_ClipInlining = ClipInlining;
1696 Arguments::_BackgroundCompilation = BackgroundCompilation;
1697 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1699 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1700 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1701 if (result != JNI_OK) {
1702 return result;
1703 }
1705 // Parse JavaVMInitArgs structure passed in
1706 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1707 if (result != JNI_OK) {
1708 return result;
1709 }
1711 if (AggressiveOpts) {
1712 // Insert alt-rt.jar between user-specified bootclasspath
1713 // prefix and the default bootclasspath. os::set_boot_path()
1714 // uses meta_index_dir as the default bootclasspath directory.
1715 const char* altclasses_jar = "alt-rt.jar";
1716 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1717 strlen(altclasses_jar);
1718 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1719 strcpy(altclasses_path, get_meta_index_dir());
1720 strcat(altclasses_path, altclasses_jar);
1721 scp.add_suffix_to_prefix(altclasses_path);
1722 scp_assembly_required = true;
1723 FREE_C_HEAP_ARRAY(char, altclasses_path);
1724 }
1726 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1727 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1728 if (result != JNI_OK) {
1729 return result;
1730 }
1732 // Do final processing now that all arguments have been parsed
1733 result = finalize_vm_init_args(&scp, scp_assembly_required);
1734 if (result != JNI_OK) {
1735 return result;
1736 }
1738 return JNI_OK;
1739 }
1741 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1742 SysClassPath* scp_p,
1743 bool* scp_assembly_required_p,
1744 FlagValueOrigin origin) {
1745 // Remaining part of option string
1746 const char* tail;
1748 // iterate over arguments
1749 for (int index = 0; index < args->nOptions; index++) {
1750 bool is_absolute_path = false; // for -agentpath vs -agentlib
1752 const JavaVMOption* option = args->options + index;
1754 if (!match_option(option, "-Djava.class.path", &tail) &&
1755 !match_option(option, "-Dsun.java.command", &tail) &&
1756 !match_option(option, "-Dsun.java.launcher", &tail)) {
1758 // add all jvm options to the jvm_args string. This string
1759 // is used later to set the java.vm.args PerfData string constant.
1760 // the -Djava.class.path and the -Dsun.java.command options are
1761 // omitted from jvm_args string as each have their own PerfData
1762 // string constant object.
1763 build_jvm_args(option->optionString);
1764 }
1766 // -verbose:[class/gc/jni]
1767 if (match_option(option, "-verbose", &tail)) {
1768 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1769 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1770 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1771 } else if (!strcmp(tail, ":gc")) {
1772 FLAG_SET_CMDLINE(bool, PrintGC, true);
1773 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1774 } else if (!strcmp(tail, ":jni")) {
1775 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1776 }
1777 // -da / -ea / -disableassertions / -enableassertions
1778 // These accept an optional class/package name separated by a colon, e.g.,
1779 // -da:java.lang.Thread.
1780 } else if (match_option(option, user_assertion_options, &tail, true)) {
1781 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1782 if (*tail == '\0') {
1783 JavaAssertions::setUserClassDefault(enable);
1784 } else {
1785 assert(*tail == ':', "bogus match by match_option()");
1786 JavaAssertions::addOption(tail + 1, enable);
1787 }
1788 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1789 } else if (match_option(option, system_assertion_options, &tail, false)) {
1790 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1791 JavaAssertions::setSystemClassDefault(enable);
1792 // -bootclasspath:
1793 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1794 scp_p->reset_path(tail);
1795 *scp_assembly_required_p = true;
1796 // -bootclasspath/a:
1797 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1798 scp_p->add_suffix(tail);
1799 *scp_assembly_required_p = true;
1800 // -bootclasspath/p:
1801 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1802 scp_p->add_prefix(tail);
1803 *scp_assembly_required_p = true;
1804 // -Xrun
1805 } else if (match_option(option, "-Xrun", &tail)) {
1806 if (tail != NULL) {
1807 const char* pos = strchr(tail, ':');
1808 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1809 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1810 name[len] = '\0';
1812 char *options = NULL;
1813 if(pos != NULL) {
1814 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1815 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1816 }
1817 #ifdef JVMTI_KERNEL
1818 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1819 warning("profiling and debugging agents are not supported with Kernel VM");
1820 } else
1821 #endif // JVMTI_KERNEL
1822 add_init_library(name, options);
1823 }
1824 // -agentlib and -agentpath
1825 } else if (match_option(option, "-agentlib:", &tail) ||
1826 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1827 if(tail != NULL) {
1828 const char* pos = strchr(tail, '=');
1829 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1830 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1831 name[len] = '\0';
1833 char *options = NULL;
1834 if(pos != NULL) {
1835 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1836 }
1837 #ifdef JVMTI_KERNEL
1838 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1839 warning("profiling and debugging agents are not supported with Kernel VM");
1840 } else
1841 #endif // JVMTI_KERNEL
1842 add_init_agent(name, options, is_absolute_path);
1844 }
1845 // -javaagent
1846 } else if (match_option(option, "-javaagent:", &tail)) {
1847 if(tail != NULL) {
1848 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1849 add_init_agent("instrument", options, false);
1850 }
1851 // -Xnoclassgc
1852 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1853 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1854 // -Xincgc: i-CMS
1855 } else if (match_option(option, "-Xincgc", &tail)) {
1856 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1857 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1858 // -Xnoincgc: no i-CMS
1859 } else if (match_option(option, "-Xnoincgc", &tail)) {
1860 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1861 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1862 // -Xconcgc
1863 } else if (match_option(option, "-Xconcgc", &tail)) {
1864 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1865 // -Xnoconcgc
1866 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1867 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1868 // -Xbatch
1869 } else if (match_option(option, "-Xbatch", &tail)) {
1870 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1871 // -Xmn for compatibility with other JVM vendors
1872 } else if (match_option(option, "-Xmn", &tail)) {
1873 julong long_initial_eden_size = 0;
1874 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1875 if (errcode != arg_in_range) {
1876 jio_fprintf(defaultStream::error_stream(),
1877 "Invalid initial eden size: %s\n", option->optionString);
1878 describe_range_error(errcode);
1879 return JNI_EINVAL;
1880 }
1881 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1882 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1883 // -Xms
1884 } else if (match_option(option, "-Xms", &tail)) {
1885 julong long_initial_heap_size = 0;
1886 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1887 if (errcode != arg_in_range) {
1888 jio_fprintf(defaultStream::error_stream(),
1889 "Invalid initial heap size: %s\n", option->optionString);
1890 describe_range_error(errcode);
1891 return JNI_EINVAL;
1892 }
1893 set_initial_heap_size((size_t) long_initial_heap_size);
1894 // Currently the minimum size and the initial heap sizes are the same.
1895 set_min_heap_size(initial_heap_size());
1896 // -Xmx
1897 } else if (match_option(option, "-Xmx", &tail)) {
1898 julong long_max_heap_size = 0;
1899 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1900 if (errcode != arg_in_range) {
1901 jio_fprintf(defaultStream::error_stream(),
1902 "Invalid maximum heap size: %s\n", option->optionString);
1903 describe_range_error(errcode);
1904 return JNI_EINVAL;
1905 }
1906 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1907 // Xmaxf
1908 } else if (match_option(option, "-Xmaxf", &tail)) {
1909 int maxf = (int)(atof(tail) * 100);
1910 if (maxf < 0 || maxf > 100) {
1911 jio_fprintf(defaultStream::error_stream(),
1912 "Bad max heap free percentage size: %s\n",
1913 option->optionString);
1914 return JNI_EINVAL;
1915 } else {
1916 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1917 }
1918 // Xminf
1919 } else if (match_option(option, "-Xminf", &tail)) {
1920 int minf = (int)(atof(tail) * 100);
1921 if (minf < 0 || minf > 100) {
1922 jio_fprintf(defaultStream::error_stream(),
1923 "Bad min heap free percentage size: %s\n",
1924 option->optionString);
1925 return JNI_EINVAL;
1926 } else {
1927 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1928 }
1929 // -Xss
1930 } else if (match_option(option, "-Xss", &tail)) {
1931 julong long_ThreadStackSize = 0;
1932 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1933 if (errcode != arg_in_range) {
1934 jio_fprintf(defaultStream::error_stream(),
1935 "Invalid thread stack size: %s\n", option->optionString);
1936 describe_range_error(errcode);
1937 return JNI_EINVAL;
1938 }
1939 // Internally track ThreadStackSize in units of 1024 bytes.
1940 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1941 round_to((int)long_ThreadStackSize, K) / K);
1942 // -Xoss
1943 } else if (match_option(option, "-Xoss", &tail)) {
1944 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1945 // -Xmaxjitcodesize
1946 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1947 julong long_ReservedCodeCacheSize = 0;
1948 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1949 (size_t)InitialCodeCacheSize);
1950 if (errcode != arg_in_range) {
1951 jio_fprintf(defaultStream::error_stream(),
1952 "Invalid maximum code cache size: %s\n",
1953 option->optionString);
1954 describe_range_error(errcode);
1955 return JNI_EINVAL;
1956 }
1957 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1958 // -green
1959 } else if (match_option(option, "-green", &tail)) {
1960 jio_fprintf(defaultStream::error_stream(),
1961 "Green threads support not available\n");
1962 return JNI_EINVAL;
1963 // -native
1964 } else if (match_option(option, "-native", &tail)) {
1965 // HotSpot always uses native threads, ignore silently for compatibility
1966 // -Xsqnopause
1967 } else if (match_option(option, "-Xsqnopause", &tail)) {
1968 // EVM option, ignore silently for compatibility
1969 // -Xrs
1970 } else if (match_option(option, "-Xrs", &tail)) {
1971 // Classic/EVM option, new functionality
1972 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1973 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1974 // change default internal VM signals used - lower case for back compat
1975 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1976 // -Xoptimize
1977 } else if (match_option(option, "-Xoptimize", &tail)) {
1978 // EVM option, ignore silently for compatibility
1979 // -Xprof
1980 } else if (match_option(option, "-Xprof", &tail)) {
1981 #ifndef FPROF_KERNEL
1982 _has_profile = true;
1983 #else // FPROF_KERNEL
1984 // do we have to exit?
1985 warning("Kernel VM does not support flat profiling.");
1986 #endif // FPROF_KERNEL
1987 // -Xaprof
1988 } else if (match_option(option, "-Xaprof", &tail)) {
1989 _has_alloc_profile = true;
1990 // -Xconcurrentio
1991 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1992 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1993 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1994 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
1995 FLAG_SET_CMDLINE(bool, UseTLAB, false);
1996 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
1998 // -Xinternalversion
1999 } else if (match_option(option, "-Xinternalversion", &tail)) {
2000 jio_fprintf(defaultStream::output_stream(), "%s\n",
2001 VM_Version::internal_vm_info_string());
2002 vm_exit(0);
2003 #ifndef PRODUCT
2004 // -Xprintflags
2005 } else if (match_option(option, "-Xprintflags", &tail)) {
2006 CommandLineFlags::printFlags();
2007 vm_exit(0);
2008 #endif
2009 // -D
2010 } else if (match_option(option, "-D", &tail)) {
2011 if (!add_property(tail)) {
2012 return JNI_ENOMEM;
2013 }
2014 // Out of the box management support
2015 if (match_option(option, "-Dcom.sun.management", &tail)) {
2016 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2017 }
2018 // -Xint
2019 } else if (match_option(option, "-Xint", &tail)) {
2020 set_mode_flags(_int);
2021 // -Xmixed
2022 } else if (match_option(option, "-Xmixed", &tail)) {
2023 set_mode_flags(_mixed);
2024 // -Xcomp
2025 } else if (match_option(option, "-Xcomp", &tail)) {
2026 // for testing the compiler; turn off all flags that inhibit compilation
2027 set_mode_flags(_comp);
2029 // -Xshare:dump
2030 } else if (match_option(option, "-Xshare:dump", &tail)) {
2031 #ifdef TIERED
2032 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2033 set_mode_flags(_int); // Prevent compilation, which creates objects
2034 #elif defined(COMPILER2)
2035 vm_exit_during_initialization(
2036 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2037 #elif defined(KERNEL)
2038 vm_exit_during_initialization(
2039 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2040 #else
2041 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2042 set_mode_flags(_int); // Prevent compilation, which creates objects
2043 #endif
2044 // -Xshare:on
2045 } else if (match_option(option, "-Xshare:on", &tail)) {
2046 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2047 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2048 #ifdef TIERED
2049 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2050 #endif // TIERED
2051 // -Xshare:auto
2052 } else if (match_option(option, "-Xshare:auto", &tail)) {
2053 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2054 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2055 // -Xshare:off
2056 } else if (match_option(option, "-Xshare:off", &tail)) {
2057 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2058 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2060 // -Xverify
2061 } else if (match_option(option, "-Xverify", &tail)) {
2062 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2063 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2064 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2065 } else if (strcmp(tail, ":remote") == 0) {
2066 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2067 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2068 } else if (strcmp(tail, ":none") == 0) {
2069 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2070 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2071 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2072 return JNI_EINVAL;
2073 }
2074 // -Xdebug
2075 } else if (match_option(option, "-Xdebug", &tail)) {
2076 // note this flag has been used, then ignore
2077 set_xdebug_mode(true);
2078 // -Xnoagent
2079 } else if (match_option(option, "-Xnoagent", &tail)) {
2080 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2081 } else if (match_option(option, "-Xboundthreads", &tail)) {
2082 // Bind user level threads to kernel threads (Solaris only)
2083 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2084 } else if (match_option(option, "-Xloggc:", &tail)) {
2085 // Redirect GC output to the file. -Xloggc:<filename>
2086 // ostream_init_log(), when called will use this filename
2087 // to initialize a fileStream.
2088 _gc_log_filename = strdup(tail);
2089 FLAG_SET_CMDLINE(bool, PrintGC, true);
2090 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2091 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2093 // JNI hooks
2094 } else if (match_option(option, "-Xcheck", &tail)) {
2095 if (!strcmp(tail, ":jni")) {
2096 CheckJNICalls = true;
2097 } else if (is_bad_option(option, args->ignoreUnrecognized,
2098 "check")) {
2099 return JNI_EINVAL;
2100 }
2101 } else if (match_option(option, "vfprintf", &tail)) {
2102 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2103 } else if (match_option(option, "exit", &tail)) {
2104 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2105 } else if (match_option(option, "abort", &tail)) {
2106 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2107 // -XX:+AggressiveHeap
2108 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2110 // This option inspects the machine and attempts to set various
2111 // parameters to be optimal for long-running, memory allocation
2112 // intensive jobs. It is intended for machines with large
2113 // amounts of cpu and memory.
2115 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2116 // VM, but we may not be able to represent the total physical memory
2117 // available (like having 8gb of memory on a box but using a 32bit VM).
2118 // Thus, we need to make sure we're using a julong for intermediate
2119 // calculations.
2120 julong initHeapSize;
2121 julong total_memory = os::physical_memory();
2123 if (total_memory < (julong)256*M) {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2126 vm_exit(1);
2127 }
2129 // The heap size is half of available memory, or (at most)
2130 // all of possible memory less 160mb (leaving room for the OS
2131 // when using ISM). This is the maximum; because adaptive sizing
2132 // is turned on below, the actual space used may be smaller.
2134 initHeapSize = MIN2(total_memory / (julong)2,
2135 total_memory - (julong)160*M);
2137 // Make sure that if we have a lot of memory we cap the 32 bit
2138 // process space. The 64bit VM version of this function is a nop.
2139 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2141 // The perm gen is separate but contiguous with the
2142 // object heap (and is reserved with it) so subtract it
2143 // from the heap size.
2144 if (initHeapSize > MaxPermSize) {
2145 initHeapSize = initHeapSize - MaxPermSize;
2146 } else {
2147 warning("AggressiveHeap and MaxPermSize values may conflict");
2148 }
2150 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2151 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2152 set_initial_heap_size(MaxHeapSize);
2153 // Currently the minimum size and the initial heap sizes are the same.
2154 set_min_heap_size(initial_heap_size());
2155 }
2156 if (FLAG_IS_DEFAULT(NewSize)) {
2157 // Make the young generation 3/8ths of the total heap.
2158 FLAG_SET_CMDLINE(uintx, NewSize,
2159 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2160 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2161 }
2163 FLAG_SET_DEFAULT(UseLargePages, true);
2165 // Increase some data structure sizes for efficiency
2166 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2167 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2168 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2170 // See the OldPLABSize comment below, but replace 'after promotion'
2171 // with 'after copying'. YoungPLABSize is the size of the survivor
2172 // space per-gc-thread buffers. The default is 4kw.
2173 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2175 // OldPLABSize is the size of the buffers in the old gen that
2176 // UseParallelGC uses to promote live data that doesn't fit in the
2177 // survivor spaces. At any given time, there's one for each gc thread.
2178 // The default size is 1kw. These buffers are rarely used, since the
2179 // survivor spaces are usually big enough. For specjbb, however, there
2180 // are occasions when there's lots of live data in the young gen
2181 // and we end up promoting some of it. We don't have a definite
2182 // explanation for why bumping OldPLABSize helps, but the theory
2183 // is that a bigger PLAB results in retaining something like the
2184 // original allocation order after promotion, which improves mutator
2185 // locality. A minor effect may be that larger PLABs reduce the
2186 // number of PLAB allocation events during gc. The value of 8kw
2187 // was arrived at by experimenting with specjbb.
2188 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2190 // CompilationPolicyChoice=0 causes the server compiler to adopt
2191 // a more conservative which-method-do-I-compile policy when one
2192 // of the counters maintained by the interpreter trips. The
2193 // result is reduced startup time and improved specjbb and
2194 // alacrity performance. Zero is the default, but we set it
2195 // explicitly here in case the default changes.
2196 // See runtime/compilationPolicy.*.
2197 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2199 // Enable parallel GC and adaptive generation sizing
2200 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2201 FLAG_SET_DEFAULT(ParallelGCThreads,
2202 Abstract_VM_Version::parallel_worker_threads());
2204 // Encourage steady state memory management
2205 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2207 // This appears to improve mutator locality
2208 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2210 // Get around early Solaris scheduling bug
2211 // (affinity vs other jobs on system)
2212 // but disallow DR and offlining (5008695).
2213 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2215 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2216 // The last option must always win.
2217 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2218 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2219 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2220 // The last option must always win.
2221 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2222 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2223 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2224 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2225 jio_fprintf(defaultStream::error_stream(),
2226 "Please use CMSClassUnloadingEnabled in place of "
2227 "CMSPermGenSweepingEnabled in the future\n");
2228 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2229 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2230 jio_fprintf(defaultStream::error_stream(),
2231 "Please use -XX:+UseGCOverheadLimit in place of "
2232 "-XX:+UseGCTimeLimit in the future\n");
2233 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2234 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2235 jio_fprintf(defaultStream::error_stream(),
2236 "Please use -XX:-UseGCOverheadLimit in place of "
2237 "-XX:-UseGCTimeLimit in the future\n");
2238 // The TLE options are for compatibility with 1.3 and will be
2239 // removed without notice in a future release. These options
2240 // are not to be documented.
2241 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2242 // No longer used.
2243 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2244 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2245 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2246 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2247 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2248 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2249 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2250 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2251 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2252 // No longer used.
2253 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2254 julong long_tlab_size = 0;
2255 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2256 if (errcode != arg_in_range) {
2257 jio_fprintf(defaultStream::error_stream(),
2258 "Invalid TLAB size: %s\n", option->optionString);
2259 describe_range_error(errcode);
2260 return JNI_EINVAL;
2261 }
2262 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2263 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2264 // No longer used.
2265 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2266 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2267 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2268 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2269 SOLARIS_ONLY(
2270 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2271 warning("-XX:+UsePermISM is obsolete.");
2272 FLAG_SET_CMDLINE(bool, UseISM, true);
2273 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2274 FLAG_SET_CMDLINE(bool, UseISM, false);
2275 )
2276 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2277 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2278 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2279 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2280 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2281 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2282 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2283 #ifdef SOLARIS
2284 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2285 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2286 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2287 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2288 #else // ndef SOLARIS
2289 jio_fprintf(defaultStream::error_stream(),
2290 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2291 return JNI_EINVAL;
2292 #endif // ndef SOLARIS
2293 } else
2294 #ifdef ASSERT
2295 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2296 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2297 // disable scavenge before parallel mark-compact
2298 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2299 } else
2300 #endif
2301 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2302 julong cms_blocks_to_claim = (julong)atol(tail);
2303 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2304 jio_fprintf(defaultStream::error_stream(),
2305 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2306 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2307 } else
2308 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2309 julong old_plab_size = 0;
2310 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2311 if (errcode != arg_in_range) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "Invalid old PLAB size: %s\n", option->optionString);
2314 describe_range_error(errcode);
2315 return JNI_EINVAL;
2316 }
2317 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Please use -XX:OldPLABSize in place of "
2320 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2321 } else
2322 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2323 julong young_plab_size = 0;
2324 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2325 if (errcode != arg_in_range) {
2326 jio_fprintf(defaultStream::error_stream(),
2327 "Invalid young PLAB size: %s\n", option->optionString);
2328 describe_range_error(errcode);
2329 return JNI_EINVAL;
2330 }
2331 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2332 jio_fprintf(defaultStream::error_stream(),
2333 "Please use -XX:YoungPLABSize in place of "
2334 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2335 } else
2336 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2337 // Skip -XX:Flags= since that case has already been handled
2338 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2339 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2340 return JNI_EINVAL;
2341 }
2342 }
2343 // Unknown option
2344 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2345 return JNI_ERR;
2346 }
2347 }
2348 // Change the default value for flags which have different default values
2349 // when working with older JDKs.
2350 if (JDK_Version::current().compare_major(6) <= 0 &&
2351 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2352 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2353 }
2354 return JNI_OK;
2355 }
2357 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2358 // This must be done after all -D arguments have been processed.
2359 scp_p->expand_endorsed();
2361 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2362 // Assemble the bootclasspath elements into the final path.
2363 Arguments::set_sysclasspath(scp_p->combined_path());
2364 }
2366 // This must be done after all arguments have been processed.
2367 // java_compiler() true means set to "NONE" or empty.
2368 if (java_compiler() && !xdebug_mode()) {
2369 // For backwards compatibility, we switch to interpreted mode if
2370 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2371 // not specified.
2372 set_mode_flags(_int);
2373 }
2374 if (CompileThreshold == 0) {
2375 set_mode_flags(_int);
2376 }
2378 #ifdef TIERED
2379 // If we are using tiered compilation in the tiered vm then c1 will
2380 // do the profiling and we don't want to waste that time in the
2381 // interpreter.
2382 if (TieredCompilation) {
2383 ProfileInterpreter = false;
2384 } else {
2385 // Since we are running vanilla server we must adjust the compile threshold
2386 // unless the user has already adjusted it because the default threshold assumes
2387 // we will run tiered.
2389 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2390 CompileThreshold = Tier2CompileThreshold;
2391 }
2392 }
2393 #endif // TIERED
2395 #ifndef COMPILER2
2396 // Don't degrade server performance for footprint
2397 if (FLAG_IS_DEFAULT(UseLargePages) &&
2398 MaxHeapSize < LargePageHeapSizeThreshold) {
2399 // No need for large granularity pages w/small heaps.
2400 // Note that large pages are enabled/disabled for both the
2401 // Java heap and the code cache.
2402 FLAG_SET_DEFAULT(UseLargePages, false);
2403 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2404 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2405 }
2407 #else
2408 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2409 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2410 }
2411 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2412 if (UseG1GC) {
2413 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2414 }
2415 #endif
2417 if (!check_vm_args_consistency()) {
2418 return JNI_ERR;
2419 }
2421 return JNI_OK;
2422 }
2424 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2425 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2426 scp_assembly_required_p);
2427 }
2429 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2430 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2431 scp_assembly_required_p);
2432 }
2434 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2435 const int N_MAX_OPTIONS = 64;
2436 const int OPTION_BUFFER_SIZE = 1024;
2437 char buffer[OPTION_BUFFER_SIZE];
2439 // The variable will be ignored if it exceeds the length of the buffer.
2440 // Don't check this variable if user has special privileges
2441 // (e.g. unix su command).
2442 if (os::getenv(name, buffer, sizeof(buffer)) &&
2443 !os::have_special_privileges()) {
2444 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Picked up %s: %s\n", name, buffer);
2447 char* rd = buffer; // pointer to the input string (rd)
2448 int i;
2449 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2450 while (isspace(*rd)) rd++; // skip whitespace
2451 if (*rd == 0) break; // we re done when the input string is read completely
2453 // The output, option string, overwrites the input string.
2454 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2455 // input string (rd).
2456 char* wrt = rd;
2458 options[i++].optionString = wrt; // Fill in option
2459 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2460 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2461 int quote = *rd; // matching quote to look for
2462 rd++; // don't copy open quote
2463 while (*rd != quote) { // include everything (even spaces) up until quote
2464 if (*rd == 0) { // string termination means unmatched string
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Unmatched quote in %s\n", name);
2467 return JNI_ERR;
2468 }
2469 *wrt++ = *rd++; // copy to option string
2470 }
2471 rd++; // don't copy close quote
2472 } else {
2473 *wrt++ = *rd++; // copy to option string
2474 }
2475 }
2476 // Need to check if we're done before writing a NULL,
2477 // because the write could be to the byte that rd is pointing to.
2478 if (*rd++ == 0) {
2479 *wrt = 0;
2480 break;
2481 }
2482 *wrt = 0; // Zero terminate option
2483 }
2484 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2485 JavaVMInitArgs vm_args;
2486 vm_args.version = JNI_VERSION_1_2;
2487 vm_args.options = options;
2488 vm_args.nOptions = i;
2489 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2491 if (PrintVMOptions) {
2492 const char* tail;
2493 for (int i = 0; i < vm_args.nOptions; i++) {
2494 const JavaVMOption *option = vm_args.options + i;
2495 if (match_option(option, "-XX:", &tail)) {
2496 logOption(tail);
2497 }
2498 }
2499 }
2501 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2502 }
2503 return JNI_OK;
2504 }
2506 // Parse entry point called from JNI_CreateJavaVM
2508 jint Arguments::parse(const JavaVMInitArgs* args) {
2510 // Sharing support
2511 // Construct the path to the archive
2512 char jvm_path[JVM_MAXPATHLEN];
2513 os::jvm_path(jvm_path, sizeof(jvm_path));
2514 #ifdef TIERED
2515 if (strstr(jvm_path, "client") != NULL) {
2516 force_client_mode = true;
2517 }
2518 #endif // TIERED
2519 char *end = strrchr(jvm_path, *os::file_separator());
2520 if (end != NULL) *end = '\0';
2521 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2522 strlen(os::file_separator()) + 20);
2523 if (shared_archive_path == NULL) return JNI_ENOMEM;
2524 strcpy(shared_archive_path, jvm_path);
2525 strcat(shared_archive_path, os::file_separator());
2526 strcat(shared_archive_path, "classes");
2527 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2528 strcat(shared_archive_path, ".jsa");
2529 SharedArchivePath = shared_archive_path;
2531 // Remaining part of option string
2532 const char* tail;
2534 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2535 bool settings_file_specified = false;
2536 const char* flags_file;
2537 int index;
2538 for (index = 0; index < args->nOptions; index++) {
2539 const JavaVMOption *option = args->options + index;
2540 if (match_option(option, "-XX:Flags=", &tail)) {
2541 flags_file = tail;
2542 settings_file_specified = true;
2543 }
2544 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2545 PrintVMOptions = true;
2546 }
2547 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2548 PrintVMOptions = false;
2549 }
2550 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2551 IgnoreUnrecognizedVMOptions = true;
2552 }
2553 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2554 IgnoreUnrecognizedVMOptions = false;
2555 }
2556 }
2558 if (IgnoreUnrecognizedVMOptions) {
2559 // uncast const to modify the flag args->ignoreUnrecognized
2560 *(jboolean*)(&args->ignoreUnrecognized) = true;
2561 }
2563 // Parse specified settings file
2564 if (settings_file_specified) {
2565 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2566 return JNI_EINVAL;
2567 }
2568 }
2570 // Parse default .hotspotrc settings file
2571 if (!settings_file_specified) {
2572 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2573 return JNI_EINVAL;
2574 }
2575 }
2577 if (PrintVMOptions) {
2578 for (index = 0; index < args->nOptions; index++) {
2579 const JavaVMOption *option = args->options + index;
2580 if (match_option(option, "-XX:", &tail)) {
2581 logOption(tail);
2582 }
2583 }
2584 }
2586 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2587 jint result = parse_vm_init_args(args);
2588 if (result != JNI_OK) {
2589 return result;
2590 }
2592 // These are hacks until G1 is fully supported and tested
2593 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
2594 if (UseG1GC) {
2595 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
2596 #ifndef PRODUCT
2597 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
2598 #endif // PRODUCT
2599 UseConcMarkSweepGC = false;
2600 UseParNewGC = false;
2601 UseParallelGC = false;
2602 UseParallelOldGC = false;
2603 UseSerialGC = false;
2604 }
2605 no_shared_spaces();
2606 }
2608 #ifndef PRODUCT
2609 if (TraceBytecodesAt != 0) {
2610 TraceBytecodes = true;
2611 }
2612 if (CountCompiledCalls) {
2613 if (UseCounterDecay) {
2614 warning("UseCounterDecay disabled because CountCalls is set");
2615 UseCounterDecay = false;
2616 }
2617 }
2618 #endif // PRODUCT
2620 if (PrintGCDetails) {
2621 // Turn on -verbose:gc options as well
2622 PrintGC = true;
2623 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2624 TraceClassUnloading = true;
2625 }
2626 }
2628 #ifdef SERIALGC
2629 set_serial_gc_flags();
2630 #endif // SERIALGC
2631 #ifdef KERNEL
2632 no_shared_spaces();
2633 #endif // KERNEL
2635 // Set flags based on ergonomics.
2636 set_ergonomics_flags();
2638 // Check the GC selections again.
2639 if (!check_gc_consistency()) {
2640 return JNI_EINVAL;
2641 }
2643 if (UseParallelGC || UseParallelOldGC) {
2644 // Set some flags for ParallelGC if needed.
2645 set_parallel_gc_flags();
2646 } else if (UseConcMarkSweepGC) {
2647 // Set some flags for CMS
2648 set_cms_and_parnew_gc_flags();
2649 } else if (UseParNewGC) {
2650 // Set some flags for ParNew
2651 set_parnew_gc_flags();
2652 }
2653 // Temporary; make the "if" an "else-if" before
2654 // we integrate G1. XXX
2655 if (UseG1GC) {
2656 // Set some flags for garbage-first, if needed.
2657 set_g1_gc_flags();
2658 }
2660 #ifdef SERIALGC
2661 assert(verify_serial_gc_flags(), "SerialGC unset");
2662 #endif // SERIALGC
2664 // Set bytecode rewriting flags
2665 set_bytecode_flags();
2667 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2668 set_aggressive_opts_flags();
2670 #ifdef CC_INTERP
2671 // Biased locking is not implemented with c++ interpreter
2672 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2673 #endif /* CC_INTERP */
2675 #ifdef COMPILER2
2676 if (!UseBiasedLocking || EmitSync != 0) {
2677 UseOptoBiasInlining = false;
2678 }
2679 #endif
2681 if (PrintCommandLineFlags) {
2682 CommandLineFlags::printSetFlags();
2683 }
2685 #ifdef ASSERT
2686 if (PrintFlagsFinal) {
2687 CommandLineFlags::printFlags();
2688 }
2689 #endif
2691 return JNI_OK;
2692 }
2694 int Arguments::PropertyList_count(SystemProperty* pl) {
2695 int count = 0;
2696 while(pl != NULL) {
2697 count++;
2698 pl = pl->next();
2699 }
2700 return count;
2701 }
2703 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2704 assert(key != NULL, "just checking");
2705 SystemProperty* prop;
2706 for (prop = pl; prop != NULL; prop = prop->next()) {
2707 if (strcmp(key, prop->key()) == 0) return prop->value();
2708 }
2709 return NULL;
2710 }
2712 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2713 int count = 0;
2714 const char* ret_val = NULL;
2716 while(pl != NULL) {
2717 if(count >= index) {
2718 ret_val = pl->key();
2719 break;
2720 }
2721 count++;
2722 pl = pl->next();
2723 }
2725 return ret_val;
2726 }
2728 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2729 int count = 0;
2730 char* ret_val = NULL;
2732 while(pl != NULL) {
2733 if(count >= index) {
2734 ret_val = pl->value();
2735 break;
2736 }
2737 count++;
2738 pl = pl->next();
2739 }
2741 return ret_val;
2742 }
2744 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2745 SystemProperty* p = *plist;
2746 if (p == NULL) {
2747 *plist = new_p;
2748 } else {
2749 while (p->next() != NULL) {
2750 p = p->next();
2751 }
2752 p->set_next(new_p);
2753 }
2754 }
2756 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2757 if (plist == NULL)
2758 return;
2760 SystemProperty* new_p = new SystemProperty(k, v, true);
2761 PropertyList_add(plist, new_p);
2762 }
2764 // This add maintains unique property key in the list.
2765 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
2766 if (plist == NULL)
2767 return;
2769 // If property key exist then update with new value.
2770 SystemProperty* prop;
2771 for (prop = *plist; prop != NULL; prop = prop->next()) {
2772 if (strcmp(k, prop->key()) == 0) {
2773 if (append) {
2774 prop->append_value(v);
2775 } else {
2776 prop->set_value(v);
2777 }
2778 return;
2779 }
2780 }
2782 PropertyList_add(plist, k, v);
2783 }
2785 #ifdef KERNEL
2786 char *Arguments::get_kernel_properties() {
2787 // Find properties starting with kernel and append them to string
2788 // We need to find out how long they are first because the URL's that they
2789 // might point to could get long.
2790 int length = 0;
2791 SystemProperty* prop;
2792 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2793 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2794 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2795 }
2796 }
2797 // Add one for null terminator.
2798 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2799 if (length != 0) {
2800 int pos = 0;
2801 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2802 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2803 jio_snprintf(&props[pos], length-pos,
2804 "-D%s=%s ", prop->key(), prop->value());
2805 pos = strlen(props);
2806 }
2807 }
2808 }
2809 // null terminate props in case of null
2810 props[length] = '\0';
2811 return props;
2812 }
2813 #endif // KERNEL
2815 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2816 // Returns true if all of the source pointed by src has been copied over to
2817 // the destination buffer pointed by buf. Otherwise, returns false.
2818 // Notes:
2819 // 1. If the length (buflen) of the destination buffer excluding the
2820 // NULL terminator character is not long enough for holding the expanded
2821 // pid characters, it also returns false instead of returning the partially
2822 // expanded one.
2823 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2824 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2825 char* buf, size_t buflen) {
2826 const char* p = src;
2827 char* b = buf;
2828 const char* src_end = &src[srclen];
2829 char* buf_end = &buf[buflen - 1];
2831 while (p < src_end && b < buf_end) {
2832 if (*p == '%') {
2833 switch (*(++p)) {
2834 case '%': // "%%" ==> "%"
2835 *b++ = *p++;
2836 break;
2837 case 'p': { // "%p" ==> current process id
2838 // buf_end points to the character before the last character so
2839 // that we could write '\0' to the end of the buffer.
2840 size_t buf_sz = buf_end - b + 1;
2841 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2843 // if jio_snprintf fails or the buffer is not long enough to hold
2844 // the expanded pid, returns false.
2845 if (ret < 0 || ret >= (int)buf_sz) {
2846 return false;
2847 } else {
2848 b += ret;
2849 assert(*b == '\0', "fail in copy_expand_pid");
2850 if (p == src_end && b == buf_end + 1) {
2851 // reach the end of the buffer.
2852 return true;
2853 }
2854 }
2855 p++;
2856 break;
2857 }
2858 default :
2859 *b++ = '%';
2860 }
2861 } else {
2862 *b++ = *p++;
2863 }
2864 }
2865 *b = '\0';
2866 return (p == src_end); // return false if not all of the source was copied
2867 }