1 /*
2 * Copyright 1997-2008 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 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
27
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
30
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_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;
48
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;
55
56 char* Arguments::SharedArchivePath = NULL;
57
58 AgentLibraryList Arguments::_libraryList;
59 AgentLibraryList Arguments::_agentList;
60
61 abort_hook_t Arguments::_abort_hook = NULL;
62 exit_hook_t Arguments::_exit_hook = NULL;
63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
64
65
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;
73
74 char* Arguments::_meta_index_path = NULL;
75 char* Arguments::_meta_index_dir = NULL;
76
77 static bool force_client_mode = false;
78
79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
80
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 }
91
92 static void logOption(const char* opt) {
93 if (PrintVMOptions) {
94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 }
96 }
97
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;
106
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 }
117
118 // Initialize system properties key and value.
119 void Arguments::init_system_properties() {
120
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));
130
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);
140
141 _java_class_path = new SystemProperty("java.class.path", "", true);
142
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);
151
152 // Set OS specific system properties values
153 os::init_system_properties_values();
154 }
155
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;
169
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 };
187
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 }
211
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();
229
230 inline void set_base(const char* base);
231 inline void add_prefix(const char* prefix);
232 inline void add_suffix(const char* suffix);
233 inline void reset_path(const char* base);
234
235 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
236 // property. Must be called after all command-line arguments have been
237 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
238 // combined_path().
239 void expand_endorsed();
240
241 inline const char* get_base() const { return _items[_scp_base]; }
242 inline const char* get_prefix() const { return _items[_scp_prefix]; }
243 inline const char* get_suffix() const { return _items[_scp_suffix]; }
244 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
245
246 // Combine all the components into a single c-heap-allocated string; caller
247 // must free the string if/when no longer needed.
248 char* combined_path();
249
250 private:
251 // Utility routines.
252 static char* add_to_path(const char* path, const char* str, bool prepend);
253 static char* add_jars_to_path(char* path, const char* directory);
254
255 inline void reset_item_at(int index);
256
257 // Array indices for the items that make up the sysclasspath. All except the
258 // base are allocated in the C heap and freed by this class.
259 enum {
260 _scp_prefix, // from -Xbootclasspath/p:...
261 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
262 _scp_base, // the default sysclasspath
263 _scp_suffix, // from -Xbootclasspath/a:...
264 _scp_nitems // the number of items, must be last.
265 };
266
267 const char* _items[_scp_nitems];
268 DEBUG_ONLY(bool _expansion_done;)
269 };
270
271 SysClassPath::SysClassPath(const char* base) {
272 memset(_items, 0, sizeof(_items));
273 _items[_scp_base] = base;
274 DEBUG_ONLY(_expansion_done = false;)
275 }
276
277 SysClassPath::~SysClassPath() {
278 // Free everything except the base.
279 for (int i = 0; i < _scp_nitems; ++i) {
280 if (i != _scp_base) reset_item_at(i);
281 }
282 DEBUG_ONLY(_expansion_done = false;)
283 }
284
285 inline void SysClassPath::set_base(const char* base) {
286 _items[_scp_base] = base;
287 }
288
289 inline void SysClassPath::add_prefix(const char* prefix) {
290 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
291 }
292
293 inline void SysClassPath::add_suffix(const char* suffix) {
294 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
295 }
296
297 inline void SysClassPath::reset_item_at(int index) {
298 assert(index < _scp_nitems && index != _scp_base, "just checking");
299 if (_items[index] != NULL) {
300 FREE_C_HEAP_ARRAY(char, _items[index]);
301 _items[index] = NULL;
302 }
303 }
304
305 inline void SysClassPath::reset_path(const char* base) {
306 // Clear the prefix and suffix.
307 reset_item_at(_scp_prefix);
308 reset_item_at(_scp_suffix);
309 set_base(base);
310 }
311
312 //------------------------------------------------------------------------------
313
314 void SysClassPath::expand_endorsed() {
315 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
316
317 const char* path = Arguments::get_property("java.endorsed.dirs");
318 if (path == NULL) {
319 path = Arguments::get_endorsed_dir();
320 assert(path != NULL, "no default for java.endorsed.dirs");
321 }
322
323 char* expanded_path = NULL;
324 const char separator = *os::path_separator();
325 const char* const end = path + strlen(path);
326 while (path < end) {
327 const char* tmp_end = strchr(path, separator);
328 if (tmp_end == NULL) {
329 expanded_path = add_jars_to_path(expanded_path, path);
330 path = end;
331 } else {
332 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
333 memcpy(dirpath, path, tmp_end - path);
334 dirpath[tmp_end - path] = '\0';
335 expanded_path = add_jars_to_path(expanded_path, dirpath);
336 FREE_C_HEAP_ARRAY(char, dirpath);
337 path = tmp_end + 1;
338 }
339 }
340 _items[_scp_endorsed] = expanded_path;
341 DEBUG_ONLY(_expansion_done = true;)
342 }
343
344 // Combine the bootclasspath elements, some of which may be null, into a single
345 // c-heap-allocated string.
346 char* SysClassPath::combined_path() {
347 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
348 assert(_expansion_done, "must call expand_endorsed() first.");
349
350 size_t lengths[_scp_nitems];
351 size_t total_len = 0;
352
353 const char separator = *os::path_separator();
354
355 // Get the lengths.
356 int i;
357 for (i = 0; i < _scp_nitems; ++i) {
358 if (_items[i] != NULL) {
359 lengths[i] = strlen(_items[i]);
360 // Include space for the separator char (or a NULL for the last item).
361 total_len += lengths[i] + 1;
362 }
363 }
364 assert(total_len > 0, "empty sysclasspath not allowed");
365
366 // Copy the _items to a single string.
367 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
368 char* cp_tmp = cp;
369 for (i = 0; i < _scp_nitems; ++i) {
370 if (_items[i] != NULL) {
371 memcpy(cp_tmp, _items[i], lengths[i]);
372 cp_tmp += lengths[i];
373 *cp_tmp++ = separator;
374 }
375 }
376 *--cp_tmp = '\0'; // Replace the extra separator.
377 return cp;
378 }
379
380 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
381 char*
382 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
383 char *cp;
384
385 assert(str != NULL, "just checking");
386 if (path == NULL) {
387 size_t len = strlen(str) + 1;
388 cp = NEW_C_HEAP_ARRAY(char, len);
389 memcpy(cp, str, len); // copy the trailing null
390 } else {
391 const char separator = *os::path_separator();
392 size_t old_len = strlen(path);
393 size_t str_len = strlen(str);
394 size_t len = old_len + str_len + 2;
395
396 if (prepend) {
397 cp = NEW_C_HEAP_ARRAY(char, len);
398 char* cp_tmp = cp;
399 memcpy(cp_tmp, str, str_len);
400 cp_tmp += str_len;
401 *cp_tmp = separator;
402 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
403 FREE_C_HEAP_ARRAY(char, path);
404 } else {
405 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
406 char* cp_tmp = cp + old_len;
407 *cp_tmp = separator;
408 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
409 }
410 }
411 return cp;
412 }
413
414 // Scan the directory and append any jar or zip files found to path.
415 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
416 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
417 DIR* dir = os::opendir(directory);
418 if (dir == NULL) return path;
419
420 char dir_sep[2] = { '\0', '\0' };
421 size_t directory_len = strlen(directory);
422 const char fileSep = *os::file_separator();
423 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
424
425 /* Scan the directory for jars/zips, appending them to path. */
426 struct dirent *entry;
427 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
428 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
429 const char* name = entry->d_name;
430 const char* ext = name + strlen(name) - 4;
431 bool isJarOrZip = ext > name &&
432 (os::file_name_strcmp(ext, ".jar") == 0 ||
433 os::file_name_strcmp(ext, ".zip") == 0);
434 if (isJarOrZip) {
435 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
436 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
437 path = add_to_path(path, jarpath, false);
438 FREE_C_HEAP_ARRAY(char, jarpath);
439 }
440 }
441 FREE_C_HEAP_ARRAY(char, dbuf);
442 os::closedir(dir);
443 return path;
444 }
445
446 // Parses a memory size specification string.
447 static bool atomull(const char *s, julong* result) {
448 julong n = 0;
449 int args_read = sscanf(s, os::julong_format_specifier(), &n);
450 if (args_read != 1) {
451 return false;
452 }
453 while (*s != '\0' && isdigit(*s)) {
454 s++;
455 }
456 // 4705540: illegal if more characters are found after the first non-digit
457 if (strlen(s) > 1) {
458 return false;
459 }
460 switch (*s) {
461 case 'T': case 't':
462 *result = n * G * K;
463 // Check for overflow.
464 if (*result/((julong)G * K) != n) return false;
465 return true;
466 case 'G': case 'g':
467 *result = n * G;
468 if (*result/G != n) return false;
469 return true;
470 case 'M': case 'm':
471 *result = n * M;
472 if (*result/M != n) return false;
473 return true;
474 case 'K': case 'k':
475 *result = n * K;
476 if (*result/K != n) return false;
477 return true;
478 case '\0':
479 *result = n;
480 return true;
481 default:
482 return false;
483 }
484 }
485
486 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
487 if (size < min_size) return arg_too_small;
488 // Check that size will fit in a size_t (only relevant on 32-bit)
489 if (size > max_uintx) return arg_too_big;
490 return arg_in_range;
491 }
492
493 // Describe an argument out of range error
494 void Arguments::describe_range_error(ArgsRange errcode) {
495 switch(errcode) {
496 case arg_too_big:
497 jio_fprintf(defaultStream::error_stream(),
498 "The specified size exceeds the maximum "
499 "representable size.\n");
500 break;
501 case arg_too_small:
502 case arg_unreadable:
503 case arg_in_range:
504 // do nothing for now
505 break;
506 default:
507 ShouldNotReachHere();
508 }
509 }
510
511 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
512 return CommandLineFlags::boolAtPut(name, &value, origin);
513 }
514
515
516 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
517 double v;
518 if (sscanf(value, "%lf", &v) != 1) {
519 return false;
520 }
521
522 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
523 return true;
524 }
525 return false;
526 }
527
528
529 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
530 julong v;
531 intx intx_v;
532 bool is_neg = false;
533 // Check the sign first since atomull() parses only unsigned values.
534 if (*value == '-') {
535 if (!CommandLineFlags::intxAt(name, &intx_v)) {
536 return false;
537 }
538 value++;
539 is_neg = true;
540 }
541 if (!atomull(value, &v)) {
542 return false;
543 }
544 intx_v = (intx) v;
545 if (is_neg) {
546 intx_v = -intx_v;
547 }
548 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
549 return true;
550 }
551 uintx uintx_v = (uintx) v;
552 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
553 return true;
554 }
555 return false;
556 }
557
558
559 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
560 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
561 // Contract: CommandLineFlags always returns a pointer that needs freeing.
562 FREE_C_HEAP_ARRAY(char, value);
563 return true;
564 }
565
566 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
567 const char* old_value = "";
568 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
569 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
570 size_t new_len = strlen(new_value);
571 const char* value;
572 char* free_this_too = NULL;
573 if (old_len == 0) {
574 value = new_value;
575 } else if (new_len == 0) {
576 value = old_value;
577 } else {
578 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
579 // each new setting adds another LINE to the switch:
580 sprintf(buf, "%s\n%s", old_value, new_value);
581 value = buf;
582 free_this_too = buf;
583 }
584 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
585 // CommandLineFlags always returns a pointer that needs freeing.
586 FREE_C_HEAP_ARRAY(char, value);
587 if (free_this_too != NULL) {
588 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
589 FREE_C_HEAP_ARRAY(char, free_this_too);
590 }
591 return true;
592 }
593
594
595 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
596
597 // range of acceptable characters spelled out for portability reasons
598 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
599 #define BUFLEN 255
600 char name[BUFLEN+1];
601 char dummy;
602
603 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
604 return set_bool_flag(name, false, origin);
605 }
606 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
607 return set_bool_flag(name, true, origin);
608 }
609
610 char punct;
611 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
612 const char* value = strchr(arg, '=') + 1;
613 Flag* flag = Flag::find_flag(name, strlen(name));
614 if (flag != NULL && flag->is_ccstr()) {
615 if (flag->ccstr_accumulates()) {
616 return append_to_string_flag(name, value, origin);
617 } else {
618 if (value[0] == '\0') {
619 value = NULL;
620 }
621 return set_string_flag(name, value, origin);
622 }
623 }
624 }
625
626 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
627 const char* value = strchr(arg, '=') + 1;
628 // -XX:Foo:=xxx will reset the string flag to the given value.
629 if (value[0] == '\0') {
630 value = NULL;
631 }
632 return set_string_flag(name, value, origin);
633 }
634
635 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
636 #define SIGNED_NUMBER_RANGE "[-0123456789]"
637 #define NUMBER_RANGE "[0123456789]"
638 char value[BUFLEN + 1];
639 char value2[BUFLEN + 1];
640 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
641 // Looks like a floating-point number -- try again with more lenient format string
642 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
643 return set_fp_numeric_flag(name, value, origin);
644 }
645 }
646
647 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
648 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
649 return set_numeric_flag(name, value, origin);
650 }
651
652 return false;
653 }
654
655
656 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
657 assert(bldarray != NULL, "illegal argument");
658
659 if (arg == NULL) {
660 return;
661 }
662
663 int index = *count;
664
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 }
674
675 void Arguments::build_jvm_args(const char* arg) {
676 add_string(&_jvm_args_array, &_num_jvm_args, arg);
677 }
678
679 void Arguments::build_jvm_flags(const char* arg) {
680 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
681 }
682
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 }
701
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 }
713
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 }
722
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 }
731
732 bool Arguments::process_argument(const char* arg,
733 jboolean ignore_unrecognized, FlagValueOrigin origin) {
734
735 JDK_Version since = JDK_Version();
736
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 }
758
759
760 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
761 FILE* stream = fopen(file_name, "rb");
762 if (stream == NULL) {
763 if (should_exist) {
764 jio_fprintf(defaultStream::error_stream(),
765 "Could not open settings file %s\n", file_name);
766 return false;
767 } else {
768 return true;
769 }
770 }
771
772 char token[1024];
773 int pos = 0;
774
775 bool in_white_space = true;
776 bool in_comment = false;
777 bool in_quote = false;
778 char quote_c = 0;
779 bool result = true;
780
781 int c = getc(stream);
782 while(c != EOF) {
783 if (in_white_space) {
784 if (in_comment) {
785 if (c == '\n') in_comment = false;
786 } else {
787 if (c == '#') in_comment = true;
788 else if (!isspace(c)) {
789 in_white_space = false;
790 token[pos++] = c;
791 }
792 }
793 } else {
794 if (c == '\n' || (!in_quote && isspace(c))) {
795 // token ends at newline, or at unquoted whitespace
796 // this allows a way to include spaces in string-valued options
797 token[pos] = '\0';
798 logOption(token);
799 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
800 build_jvm_flags(token);
801 pos = 0;
802 in_white_space = true;
803 in_quote = false;
804 } else if (!in_quote && (c == '\'' || c == '"')) {
805 in_quote = true;
806 quote_c = c;
807 } else if (in_quote && (c == quote_c)) {
808 in_quote = false;
809 } else {
810 token[pos++] = c;
811 }
812 }
813 c = getc(stream);
814 }
815 if (pos > 0) {
816 token[pos] = '\0';
817 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
818 build_jvm_flags(token);
819 }
820 fclose(stream);
821 return result;
822 }
823
824 //=============================================================================================================
825 // Parsing of properties (-D)
826
827 const char* Arguments::get_property(const char* key) {
828 return PropertyList_get_value(system_properties(), key);
829 }
830
831 bool Arguments::add_property(const char* prop) {
832 const char* eq = strchr(prop, '=');
833 char* key;
834 // ns must be static--its address may be stored in a SystemProperty object.
835 const static char ns[1] = {0};
836 char* value = (char *)ns;
837
838 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
839 key = AllocateHeap(key_len + 1, "add_property");
840 strncpy(key, prop, key_len);
841 key[key_len] = '\0';
842
843 if (eq != NULL) {
844 size_t value_len = strlen(prop) - key_len - 1;
845 value = AllocateHeap(value_len + 1, "add_property");
846 strncpy(value, &prop[key_len + 1], value_len + 1);
847 }
848
849 if (strcmp(key, "java.compiler") == 0) {
850 process_java_compiler_argument(value);
851 FreeHeap(key);
852 if (eq != NULL) {
853 FreeHeap(value);
854 }
855 return true;
856 }
857 else if (strcmp(key, "sun.java.command") == 0) {
858
859 _java_command = value;
860
861 // don't add this property to the properties exposed to the java application
862 FreeHeap(key);
863 return true;
864 }
865 else if (strcmp(key, "sun.java.launcher.pid") == 0) {
866 // launcher.pid property is private and is processed
867 // in process_sun_java_launcher_properties();
868 // the sun.java.launcher property is passed on to the java application
869 FreeHeap(key);
870 if (eq != NULL) {
871 FreeHeap(value);
872 }
873 return true;
874 }
875 else if (strcmp(key, "java.vendor.url.bug") == 0) {
876 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
877 // its value without going through the property list or making a Java call.
878 _java_vendor_url_bug = value;
879 }
880
881 // Create new property and add at the end of the list
882 PropertyList_unique_add(&_system_properties, key, value);
883 return true;
884 }
885
886 //===========================================================================================================
887 // Setting int/mixed/comp mode flags
888
889 void Arguments::set_mode_flags(Mode mode) {
890 // Set up default values for all flags.
891 // If you add a flag to any of the branches below,
892 // add a default value for it here.
893 set_java_compiler(false);
894 _mode = mode;
895
896 // Ensure Agent_OnLoad has the correct initial values.
897 // This may not be the final mode; mode may change later in onload phase.
898 PropertyList_unique_add(&_system_properties, "java.vm.info",
899 (char*)Abstract_VM_Version::vm_info_string());
900
901 UseInterpreter = true;
902 UseCompiler = true;
903 UseLoopCounter = true;
904
905 // Default values may be platform/compiler dependent -
906 // use the saved values
907 ClipInlining = Arguments::_ClipInlining;
908 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
909 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
910 BackgroundCompilation = Arguments::_BackgroundCompilation;
911 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
912
913 // Change from defaults based on mode
914 switch (mode) {
915 default:
916 ShouldNotReachHere();
917 break;
918 case _int:
919 UseCompiler = false;
920 UseLoopCounter = false;
921 AlwaysCompileLoopMethods = false;
922 UseOnStackReplacement = false;
923 break;
924 case _mixed:
925 // same as default
926 break;
927 case _comp:
928 UseInterpreter = false;
929 BackgroundCompilation = false;
930 ClipInlining = false;
931 break;
932 }
933 }
934
935
936 // Conflict: required to use shared spaces (-Xshare:on), but
937 // incompatible command line options were chosen.
938
939 static void no_shared_spaces() {
940 if (RequireSharedSpaces) {
941 jio_fprintf(defaultStream::error_stream(),
942 "Class data sharing is inconsistent with other specified options.\n");
943 vm_exit_during_initialization("Unable to use shared archive.", NULL);
944 } else {
945 FLAG_SET_DEFAULT(UseSharedSpaces, false);
946 }
947 }
948
949
950 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
951 // if it's not explictly set or unset. If the user has chosen
952 // UseParNewGC and not explicitly set ParallelGCThreads we
953 // set it, unless this is a single cpu machine.
954 void Arguments::set_parnew_gc_flags() {
955 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
956 "control point invariant");
957 assert(UseParNewGC, "Error");
958
959 // Turn off AdaptiveSizePolicy by default for parnew until it is
960 // complete.
961 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
962 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
963 }
964
965 if (ParallelGCThreads == 0) {
966 FLAG_SET_DEFAULT(ParallelGCThreads,
967 Abstract_VM_Version::parallel_worker_threads());
968 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
969 FLAG_SET_DEFAULT(UseParNewGC, false);
970 }
971 }
972 if (!UseParNewGC) {
973 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
974 } else {
975 no_shared_spaces();
976
977 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
978 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
979 // we set them to 1024 and 1024.
980 // See CR 6362902.
981 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
982 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
983 }
984 if (FLAG_IS_DEFAULT(OldPLABSize)) {
985 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
986 }
987
988 // AlwaysTenure flag should make ParNew to promote all at first collection.
989 // See CR 6362902.
990 if (AlwaysTenure) {
991 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
992 }
993 }
994 }
995
996 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
997 // sparc/solaris for certain applications, but would gain from
998 // further optimization and tuning efforts, and would almost
999 // certainly gain from analysis of platform and environment.
1000 void Arguments::set_cms_and_parnew_gc_flags() {
1001 assert(!UseSerialGC && !UseParallelGC, "Error");
1002 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1003
1004 // If we are using CMS, we prefer to UseParNewGC,
1005 // unless explicitly forbidden.
1006 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1007 FLAG_SET_ERGO(bool, UseParNewGC, true);
1008 }
1009
1010 // Turn off AdaptiveSizePolicy by default for cms until it is
1011 // complete.
1012 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1013 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1014 }
1015
1016 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1017 // as needed.
1018 if (UseParNewGC) {
1019 set_parnew_gc_flags();
1020 }
1021
1022 // Now make adjustments for CMS
1023 size_t young_gen_per_worker;
1024 intx new_ratio;
1025 size_t min_new_default;
1026 intx tenuring_default;
1027 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1028 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1029 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1030 }
1031 young_gen_per_worker = 4*M;
1032 new_ratio = (intx)15;
1033 min_new_default = 4*M;
1034 tenuring_default = (intx)0;
1035 } else { // new defaults: "new" as of 6.0
1036 young_gen_per_worker = CMSYoungGenPerWorker;
1037 new_ratio = (intx)7;
1038 min_new_default = 16*M;
1039 tenuring_default = (intx)4;
1040 }
1041
1042 // Preferred young gen size for "short" pauses
1043 const uintx parallel_gc_threads =
1044 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1045 const size_t preferred_max_new_size_unaligned =
1046 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1047 const size_t preferred_max_new_size =
1048 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1049
1050 // Unless explicitly requested otherwise, size young gen
1051 // for "short" pauses ~ 4M*ParallelGCThreads
1052 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1053 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1054 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1055 } else {
1056 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1057 }
1058 if(PrintGCDetails && Verbose) {
1059 // Too early to use gclog_or_tty
1060 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1061 }
1062 }
1063 // Unless explicitly requested otherwise, prefer a large
1064 // Old to Young gen size so as to shift the collection load
1065 // to the old generation concurrent collector
1066 if (FLAG_IS_DEFAULT(NewRatio)) {
1067 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1068
1069 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1070 size_t prev_initial_size = initial_heap_size();
1071 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1072 set_initial_heap_size(min_new+OldSize);
1073 // Currently minimum size and the initial heap sizes are the same.
1074 set_min_heap_size(initial_heap_size());
1075 if (PrintGCDetails && Verbose) {
1076 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1077 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1078 initial_heap_size()/M, prev_initial_size/M);
1079 }
1080 }
1081 // MaxHeapSize is aligned down in collectorPolicy
1082 size_t max_heap = align_size_down(MaxHeapSize,
1083 CardTableRS::ct_max_alignment_constraint());
1084
1085 if(PrintGCDetails && Verbose) {
1086 // Too early to use gclog_or_tty
1087 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1088 " initial_heap_size: " SIZE_FORMAT
1089 " max_heap: " SIZE_FORMAT,
1090 min_heap_size(), initial_heap_size(), max_heap);
1091 }
1092 if (max_heap > min_new) {
1093 // Unless explicitly requested otherwise, make young gen
1094 // at least min_new, and at most preferred_max_new_size.
1095 if (FLAG_IS_DEFAULT(NewSize)) {
1096 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1097 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1098 if(PrintGCDetails && Verbose) {
1099 // Too early to use gclog_or_tty
1100 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1101 }
1102 }
1103 // Unless explicitly requested otherwise, size old gen
1104 // so that it's at least 3X of NewSize to begin with;
1105 // later NewRatio will decide how it grows; see above.
1106 if (FLAG_IS_DEFAULT(OldSize)) {
1107 if (max_heap > NewSize) {
1108 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1109 if(PrintGCDetails && Verbose) {
1110 // Too early to use gclog_or_tty
1111 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1112 }
1113 }
1114 }
1115 }
1116 }
1117 // Unless explicitly requested otherwise, definitely
1118 // promote all objects surviving "tenuring_default" scavenges.
1119 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1120 FLAG_IS_DEFAULT(SurvivorRatio)) {
1121 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1122 }
1123 // If we decided above (or user explicitly requested)
1124 // `promote all' (via MaxTenuringThreshold := 0),
1125 // prefer minuscule survivor spaces so as not to waste
1126 // space for (non-existent) survivors
1127 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1128 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1129 }
1130 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1131 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1132 // This is done in order to make ParNew+CMS configuration to work
1133 // with YoungPLABSize and OldPLABSize options.
1134 // See CR 6362902.
1135 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1136 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1137 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1138 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1139 // the value (either from the command line or ergonomics) of
1140 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1141 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1142 }
1143 else {
1144 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1145 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1146 // we'll let it to take precedence.
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1149 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1150 }
1151 }
1152 }
1153
1154 inline uintx max_heap_for_compressed_oops() {
1155 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1156 NOT_LP64(return DefaultMaxRAM);
1157 }
1158
1159 bool Arguments::should_auto_select_low_pause_collector() {
1160 if (UseAutoGCSelectPolicy &&
1161 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1162 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1163 if (PrintGCDetails) {
1164 // Cannot use gclog_or_tty yet.
1165 tty->print_cr("Automatic selection of the low pause collector"
1166 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1167 }
1168 return true;
1169 }
1170 return false;
1171 }
1172
1173 void Arguments::set_ergonomics_flags() {
1174 // Parallel GC is not compatible with sharing. If one specifies
1175 // that they want sharing explicitly, do not set ergonmics flags.
1176 if (DumpSharedSpaces || ForceSharedSpaces) {
1177 return;
1178 }
1179
1180 if (os::is_server_class_machine() && !force_client_mode ) {
1181 // If no other collector is requested explicitly,
1182 // let the VM select the collector based on
1183 // machine class and automatic selection policy.
1184 if (!UseSerialGC &&
1185 !UseConcMarkSweepGC &&
1186 !UseG1GC &&
1187 !UseParNewGC &&
1188 !DumpSharedSpaces &&
1189 FLAG_IS_DEFAULT(UseParallelGC)) {
1190 if (should_auto_select_low_pause_collector()) {
1191 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1192 } else {
1193 FLAG_SET_ERGO(bool, UseParallelGC, true);
1194 }
1195 no_shared_spaces();
1196 }
1197 }
1198
1199 #ifdef _LP64
1200 // Compressed Headers do not work with CMS, which uses a bit in the klass
1201 // field offset to determine free list chunk markers.
1202 // Check that UseCompressedOops can be set with the max heap size allocated
1203 // by ergonomics.
1204 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1205 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1206 // Turn off until bug is fixed.
1207 // the following line to return it to default status.
1208 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1209 } else if (UseCompressedOops && UseG1GC) {
1210 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
1211 FLAG_SET_DEFAULT(UseCompressedOops, false);
1212 }
1213 #ifdef _WIN64
1214 if (UseLargePages && UseCompressedOops) {
1215 // Cannot allocate guard pages for implicit checks in indexed addressing
1216 // mode, when large pages are specified on windows.
1217 FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false);
1218 }
1219 #endif // _WIN64
1220 } else {
1221 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1222 warning("Max heap size too large for Compressed Oops");
1223 FLAG_SET_DEFAULT(UseCompressedOops, false);
1224 }
1225 }
1226 // Also checks that certain machines are slower with compressed oops
1227 // in vm_version initialization code.
1228 #endif // _LP64
1229 }
1230
1231 void Arguments::set_parallel_gc_flags() {
1232 assert(UseParallelGC || UseParallelOldGC, "Error");
1233 // If parallel old was requested, automatically enable parallel scavenge.
1234 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1235 FLAG_SET_DEFAULT(UseParallelGC, true);
1236 }
1237
1238 // If no heap maximum was requested explicitly, use some reasonable fraction
1239 // of the physical memory, up to a maximum of 1GB.
1240 if (UseParallelGC) {
1241 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1242 Abstract_VM_Version::parallel_worker_threads());
1243
1244 // PS is a server collector, setup the heap sizes accordingly.
1245 set_server_heap_size();
1246 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1247 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1248 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1249 // See CR 6362902 for details.
1250 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1251 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1252 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1253 }
1254 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1255 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1256 }
1257 }
1258
1259 if (UseParallelOldGC) {
1260 // Par compact uses lower default values since they are treated as
1261 // minimums. These are different defaults because of the different
1262 // interpretation and are not ergonomically set.
1263 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1264 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1265 }
1266 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1267 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1268 }
1269 }
1270 }
1271 }
1272
1273 void Arguments::set_g1_gc_flags() {
1274 assert(UseG1GC, "Error");
1275 // G1 is a server collector, setup the heap sizes accordingly.
1276 set_server_heap_size();
1277 #ifdef COMPILER1
1278 FastTLABRefill = false;
1279 #endif
1280 FLAG_SET_DEFAULT(ParallelGCThreads,
1281 Abstract_VM_Version::parallel_worker_threads());
1282 if (ParallelGCThreads == 0) {
1283 FLAG_SET_DEFAULT(ParallelGCThreads,
1284 Abstract_VM_Version::parallel_worker_threads
1285 ());
1286 }
1287 no_shared_spaces();
1288 }
1289
1290 void Arguments::set_server_heap_size() {
1291 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1292 const uint64_t reasonable_fraction =
1293 os::physical_memory() / DefaultMaxRAMFraction;
1294 const uint64_t maximum_size = (uint64_t)
1295 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1296 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1297 DefaultMaxRAM);
1298 size_t reasonable_max =
1299 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1300 if (reasonable_max > maximum_size) {
1301 reasonable_max = maximum_size;
1302 }
1303 if (PrintGCDetails && Verbose) {
1304 // Cannot use gclog_or_tty yet.
1305 tty->print_cr(" Max heap size for server class platform "
1306 SIZE_FORMAT, reasonable_max);
1307 }
1308 // If the initial_heap_size has not been set with -Xms,
1309 // then set it as fraction of size of physical memory
1310 // respecting the maximum and minimum sizes of the heap.
1311 if (initial_heap_size() == 0) {
1312 const uint64_t reasonable_initial_fraction =
1313 os::physical_memory() / DefaultInitialRAMFraction;
1314 const size_t reasonable_initial =
1315 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1316 const size_t minimum_size = NewSize + OldSize;
1317 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1318 minimum_size));
1319 // Currently the minimum size and the initial heap sizes are the same.
1320 set_min_heap_size(initial_heap_size());
1321 if (PrintGCDetails && Verbose) {
1322 // Cannot use gclog_or_tty yet.
1323 tty->print_cr(" Initial heap size for server class platform "
1324 SIZE_FORMAT, initial_heap_size());
1325 }
1326 } else {
1327 // A minimum size was specified on the command line. Be sure
1328 // that the maximum size is consistent.
1329 if (initial_heap_size() > reasonable_max) {
1330 reasonable_max = initial_heap_size();
1331 }
1332 }
1333 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1334 }
1335 }
1336
1337 // This must be called after ergonomics because we want bytecode rewriting
1338 // if the server compiler is used, or if UseSharedSpaces is disabled.
1339 void Arguments::set_bytecode_flags() {
1340 // Better not attempt to store into a read-only space.
1341 if (UseSharedSpaces) {
1342 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1343 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1344 }
1345
1346 if (!RewriteBytecodes) {
1347 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1348 }
1349 }
1350
1351 // Aggressive optimization flags -XX:+AggressiveOpts
1352 void Arguments::set_aggressive_opts_flags() {
1353 #ifdef COMPILER2
1354 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1355 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1356 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1357 }
1358 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1359 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1360 }
1361
1362 // Feed the cache size setting into the JDK
1363 char buffer[1024];
1364 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1365 add_property(buffer);
1366 }
1367 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1368 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1369 }
1370 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) {
1371 FLAG_SET_DEFAULT(SpecialArraysEquals, true);
1372 }
1373 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1374 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1375 }
1376 #endif
1377
1378 if (AggressiveOpts) {
1379 // Sample flag setting code
1380 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1381 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1382 // }
1383 }
1384 }
1385
1386 //===========================================================================================================
1387 // Parsing of java.compiler property
1388
1389 void Arguments::process_java_compiler_argument(char* arg) {
1390 // For backwards compatibility, Djava.compiler=NONE or ""
1391 // causes us to switch to -Xint mode UNLESS -Xdebug
1392 // is also specified.
1393 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1394 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1395 }
1396 }
1397
1398 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1399 _sun_java_launcher = strdup(launcher);
1400 }
1401
1402 bool Arguments::created_by_java_launcher() {
1403 assert(_sun_java_launcher != NULL, "property must have value");
1404 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1405 }
1406
1407 //===========================================================================================================
1408 // Parsing of main arguments
1409
1410 bool Arguments::verify_percentage(uintx value, const char* name) {
1411 if (value <= 100) {
1412 return true;
1413 }
1414 jio_fprintf(defaultStream::error_stream(),
1415 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1416 name, value);
1417 return false;
1418 }
1419
1420 static void set_serial_gc_flags() {
1421 FLAG_SET_DEFAULT(UseSerialGC, true);
1422 FLAG_SET_DEFAULT(UseParNewGC, false);
1423 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1424 FLAG_SET_DEFAULT(UseParallelGC, false);
1425 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1426 FLAG_SET_DEFAULT(UseG1GC, false);
1427 }
1428
1429 static bool verify_serial_gc_flags() {
1430 return (UseSerialGC &&
1431 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC ||
1432 UseParallelGC || UseParallelOldGC));
1433 }
1434
1435 // Check consistency of GC selection
1436 bool Arguments::check_gc_consistency() {
1437 bool status = true;
1438 // Ensure that the user has not selected conflicting sets
1439 // of collectors. [Note: this check is merely a user convenience;
1440 // collectors over-ride each other so that only a non-conflicting
1441 // set is selected; however what the user gets is not what they
1442 // may have expected from the combination they asked for. It's
1443 // better to reduce user confusion by not allowing them to
1444 // select conflicting combinations.
1445 uint i = 0;
1446 if (UseSerialGC) i++;
1447 if (UseConcMarkSweepGC || UseParNewGC) i++;
1448 if (UseParallelGC || UseParallelOldGC) i++;
1449 if (i > 1) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "Conflicting collector combinations in option list; "
1452 "please refer to the release notes for the combinations "
1453 "allowed\n");
1454 status = false;
1455 }
1456
1457 return status;
1458 }
1459
1460 // Check the consistency of vm_init_args
1461 bool Arguments::check_vm_args_consistency() {
1462 // Method for adding checks for flag consistency.
1463 // The intent is to warn the user of all possible conflicts,
1464 // before returning an error.
1465 // Note: Needs platform-dependent factoring.
1466 bool status = true;
1467
1468 #if ( (defined(COMPILER2) && defined(SPARC)))
1469 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1470 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1471 // x86. Normally, VM_Version_init must be called from init_globals in
1472 // init.cpp, which is called by the initial java thread *after* arguments
1473 // have been parsed. VM_Version_init gets called twice on sparc.
1474 extern void VM_Version_init();
1475 VM_Version_init();
1476 if (!VM_Version::has_v9()) {
1477 jio_fprintf(defaultStream::error_stream(),
1478 "V8 Machine detected, Server requires V9\n");
1479 status = false;
1480 }
1481 #endif /* COMPILER2 && SPARC */
1482
1483 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1484 // builds so the cost of stack banging can be measured.
1485 #if (defined(PRODUCT) && defined(SOLARIS))
1486 if (!UseBoundThreads && !UseStackBanging) {
1487 jio_fprintf(defaultStream::error_stream(),
1488 "-UseStackBanging conflicts with -UseBoundThreads\n");
1489
1490 status = false;
1491 }
1492 #endif
1493
1494 if (TLABRefillWasteFraction == 0) {
1495 jio_fprintf(defaultStream::error_stream(),
1496 "TLABRefillWasteFraction should be a denominator, "
1497 "not " SIZE_FORMAT "\n",
1498 TLABRefillWasteFraction);
1499 status = false;
1500 }
1501
1502 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1503 "MaxLiveObjectEvacuationRatio");
1504 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1505 "AdaptiveSizePolicyWeight");
1506 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1507 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1508 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1509 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1510
1511 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1512 jio_fprintf(defaultStream::error_stream(),
1513 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1514 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1515 MinHeapFreeRatio, MaxHeapFreeRatio);
1516 status = false;
1517 }
1518 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1519 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1520
1521 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1522 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1523 }
1524
1525 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1526 // Settings to encourage splitting.
1527 if (!FLAG_IS_CMDLINE(NewRatio)) {
1528 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1529 }
1530 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1531 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1532 }
1533 }
1534
1535 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1536 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1537 if (GCTimeLimit == 100) {
1538 // Turn off gc-overhead-limit-exceeded checks
1539 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1540 }
1541
1542 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1543
1544 // Check user specified sharing option conflict with Parallel GC
1545 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC ||
1546 UseParallelGC || UseParallelOldGC ||
1547 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1548
1549 if (cannot_share) {
1550 // Either force sharing on by forcing the other options off, or
1551 // force sharing off.
1552 if (DumpSharedSpaces || ForceSharedSpaces) {
1553 set_serial_gc_flags();
1554 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1555 } else {
1556 no_shared_spaces();
1557 }
1558 }
1559
1560 status = status && check_gc_consistency();
1561
1562 if (_has_alloc_profile) {
1563 if (UseParallelGC || UseParallelOldGC) {
1564 jio_fprintf(defaultStream::error_stream(),
1565 "error: invalid argument combination.\n"
1566 "Allocation profiling (-Xaprof) cannot be used together with "
1567 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1568 status = false;
1569 }
1570 if (UseConcMarkSweepGC) {
1571 jio_fprintf(defaultStream::error_stream(),
1572 "error: invalid argument combination.\n"
1573 "Allocation profiling (-Xaprof) cannot be used together with "
1574 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1575 status = false;
1576 }
1577 }
1578
1579 if (CMSIncrementalMode) {
1580 if (!UseConcMarkSweepGC) {
1581 jio_fprintf(defaultStream::error_stream(),
1582 "error: invalid argument combination.\n"
1583 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1584 "selected in order\nto use CMSIncrementalMode.\n");
1585 status = false;
1586 } else {
1587 status = status && verify_percentage(CMSIncrementalDutyCycle,
1588 "CMSIncrementalDutyCycle");
1589 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1590 "CMSIncrementalDutyCycleMin");
1591 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1592 "CMSIncrementalSafetyFactor");
1593 status = status && verify_percentage(CMSIncrementalOffset,
1594 "CMSIncrementalOffset");
1595 status = status && verify_percentage(CMSExpAvgFactor,
1596 "CMSExpAvgFactor");
1597 // If it was not set on the command line, set
1598 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1599 if (CMSInitiatingOccupancyFraction < 0) {
1600 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1601 }
1602 }
1603 }
1604
1605 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1606 // insists that we hold the requisite locks so that the iteration is
1607 // MT-safe. For the verification at start-up and shut-down, we don't
1608 // yet have a good way of acquiring and releasing these locks,
1609 // which are not visible at the CollectedHeap level. We want to
1610 // be able to acquire these locks and then do the iteration rather
1611 // than just disable the lock verification. This will be fixed under
1612 // bug 4788986.
1613 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1614 if (VerifyGCStartAt == 0) {
1615 warning("Heap verification at start-up disabled "
1616 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1617 VerifyGCStartAt = 1; // Disable verification at start-up
1618 }
1619 if (VerifyBeforeExit) {
1620 warning("Heap verification at shutdown disabled "
1621 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1622 VerifyBeforeExit = false; // Disable verification at shutdown
1623 }
1624 }
1625
1626 // Note: only executed in non-PRODUCT mode
1627 if (!UseAsyncConcMarkSweepGC &&
1628 (ExplicitGCInvokesConcurrent ||
1629 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1630 jio_fprintf(defaultStream::error_stream(),
1631 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1632 " with -UseAsyncConcMarkSweepGC");
1633 status = false;
1634 }
1635
1636 return status;
1637 }
1638
1639 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1640 const char* option_type) {
1641 if (ignore) return false;
1642
1643 const char* spacer = " ";
1644 if (option_type == NULL) {
1645 option_type = ++spacer; // Set both to the empty string.
1646 }
1647
1648 if (os::obsolete_option(option)) {
1649 jio_fprintf(defaultStream::error_stream(),
1650 "Obsolete %s%soption: %s\n", option_type, spacer,
1651 option->optionString);
1652 return false;
1653 } else {
1654 jio_fprintf(defaultStream::error_stream(),
1655 "Unrecognized %s%soption: %s\n", option_type, spacer,
1656 option->optionString);
1657 return true;
1658 }
1659 }
1660
1661 static const char* user_assertion_options[] = {
1662 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1663 };
1664
1665 static const char* system_assertion_options[] = {
1666 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1667 };
1668
1669 // Return true if any of the strings in null-terminated array 'names' matches.
1670 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1671 // the option must match exactly.
1672 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1673 bool tail_allowed) {
1674 for (/* empty */; *names != NULL; ++names) {
1675 if (match_option(option, *names, tail)) {
1676 if (**tail == '\0' || tail_allowed && **tail == ':') {
1677 return true;
1678 }
1679 }
1680 }
1681 return false;
1682 }
1683
1684 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1685 julong* long_arg,
1686 julong min_size) {
1687 if (!atomull(s, long_arg)) return arg_unreadable;
1688 return check_memory_size(*long_arg, min_size);
1689 }
1690
1691 // Parse JavaVMInitArgs structure
1692
1693 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1694 // For components of the system classpath.
1695 SysClassPath scp(Arguments::get_sysclasspath());
1696 bool scp_assembly_required = false;
1697
1698 // Save default settings for some mode flags
1699 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1700 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1701 Arguments::_ClipInlining = ClipInlining;
1702 Arguments::_BackgroundCompilation = BackgroundCompilation;
1703 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1704
1705 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1706 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1707 if (result != JNI_OK) {
1708 return result;
1709 }
1710
1711 // Parse JavaVMInitArgs structure passed in
1712 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1713 if (result != JNI_OK) {
1714 return result;
1715 }
1716
1717 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1718 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1719 if (result != JNI_OK) {
1720 return result;
1721 }
1722
1723 // Do final processing now that all arguments have been parsed
1724 result = finalize_vm_init_args(&scp, scp_assembly_required);
1725 if (result != JNI_OK) {
1726 return result;
1727 }
1728
1729 return JNI_OK;
1730 }
1731
1732
1733 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1734 SysClassPath* scp_p,
1735 bool* scp_assembly_required_p,
1736 FlagValueOrigin origin) {
1737 // Remaining part of option string
1738 const char* tail;
1739
1740 // iterate over arguments
1741 for (int index = 0; index < args->nOptions; index++) {
1742 bool is_absolute_path = false; // for -agentpath vs -agentlib
1743
1744 const JavaVMOption* option = args->options + index;
1745
1746 if (!match_option(option, "-Djava.class.path", &tail) &&
1747 !match_option(option, "-Dsun.java.command", &tail) &&
1748 !match_option(option, "-Dsun.java.launcher", &tail)) {
1749
1750 // add all jvm options to the jvm_args string. This string
1751 // is used later to set the java.vm.args PerfData string constant.
1752 // the -Djava.class.path and the -Dsun.java.command options are
1753 // omitted from jvm_args string as each have their own PerfData
1754 // string constant object.
1755 build_jvm_args(option->optionString);
1756 }
1757
1758 // -verbose:[class/gc/jni]
1759 if (match_option(option, "-verbose", &tail)) {
1760 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1761 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1762 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1763 } else if (!strcmp(tail, ":gc")) {
1764 FLAG_SET_CMDLINE(bool, PrintGC, true);
1765 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1766 } else if (!strcmp(tail, ":jni")) {
1767 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1768 }
1769 // -da / -ea / -disableassertions / -enableassertions
1770 // These accept an optional class/package name separated by a colon, e.g.,
1771 // -da:java.lang.Thread.
1772 } else if (match_option(option, user_assertion_options, &tail, true)) {
1773 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1774 if (*tail == '\0') {
1775 JavaAssertions::setUserClassDefault(enable);
1776 } else {
1777 assert(*tail == ':', "bogus match by match_option()");
1778 JavaAssertions::addOption(tail + 1, enable);
1779 }
1780 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1781 } else if (match_option(option, system_assertion_options, &tail, false)) {
1782 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1783 JavaAssertions::setSystemClassDefault(enable);
1784 // -bootclasspath:
1785 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1786 scp_p->reset_path(tail);
1787 *scp_assembly_required_p = true;
1788 // -bootclasspath/a:
1789 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1790 scp_p->add_suffix(tail);
1791 *scp_assembly_required_p = true;
1792 // -bootclasspath/p:
1793 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1794 scp_p->add_prefix(tail);
1795 *scp_assembly_required_p = true;
1796 // -Xrun
1797 } else if (match_option(option, "-Xrun", &tail)) {
1798 if(tail != NULL) {
1799 const char* pos = strchr(tail, ':');
1800 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1801 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1802 name[len] = '\0';
1803
1804 char *options = NULL;
1805 if(pos != NULL) {
1806 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1807 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1808 }
1809 #ifdef JVMTI_KERNEL
1810 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1811 warning("profiling and debugging agents are not supported with Kernel VM");
1812 } else
1813 #endif // JVMTI_KERNEL
1814 add_init_library(name, options);
1815 }
1816 // -agentlib and -agentpath
1817 } else if (match_option(option, "-agentlib:", &tail) ||
1818 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1819 if(tail != NULL) {
1820 const char* pos = strchr(tail, '=');
1821 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1822 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1823 name[len] = '\0';
1824
1825 char *options = NULL;
1826 if(pos != NULL) {
1827 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1828 }
1829 #ifdef JVMTI_KERNEL
1830 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1831 warning("profiling and debugging agents are not supported with Kernel VM");
1832 } else
1833 #endif // JVMTI_KERNEL
1834 add_init_agent(name, options, is_absolute_path);
1835
1836 }
1837 // -javaagent
1838 } else if (match_option(option, "-javaagent:", &tail)) {
1839 if(tail != NULL) {
1840 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1841 add_init_agent("instrument", options, false);
1842 }
1843 // -Xnoclassgc
1844 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1845 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1846 // -Xincgc: i-CMS
1847 } else if (match_option(option, "-Xincgc", &tail)) {
1848 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1849 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1850 // -Xnoincgc: no i-CMS
1851 } else if (match_option(option, "-Xnoincgc", &tail)) {
1852 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1853 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1854 // -Xconcgc
1855 } else if (match_option(option, "-Xconcgc", &tail)) {
1856 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1857 // -Xnoconcgc
1858 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1859 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1860 // -Xbatch
1861 } else if (match_option(option, "-Xbatch", &tail)) {
1862 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1863 // -Xmn for compatibility with other JVM vendors
1864 } else if (match_option(option, "-Xmn", &tail)) {
1865 julong long_initial_eden_size = 0;
1866 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1867 if (errcode != arg_in_range) {
1868 jio_fprintf(defaultStream::error_stream(),
1869 "Invalid initial eden size: %s\n", option->optionString);
1870 describe_range_error(errcode);
1871 return JNI_EINVAL;
1872 }
1873 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1874 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1875 // -Xms
1876 } else if (match_option(option, "-Xms", &tail)) {
1877 julong long_initial_heap_size = 0;
1878 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1879 if (errcode != arg_in_range) {
1880 jio_fprintf(defaultStream::error_stream(),
1881 "Invalid initial heap size: %s\n", option->optionString);
1882 describe_range_error(errcode);
1883 return JNI_EINVAL;
1884 }
1885 set_initial_heap_size((size_t) long_initial_heap_size);
1886 // Currently the minimum size and the initial heap sizes are the same.
1887 set_min_heap_size(initial_heap_size());
1888 // -Xmx
1889 } else if (match_option(option, "-Xmx", &tail)) {
1890 julong long_max_heap_size = 0;
1891 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1892 if (errcode != arg_in_range) {
1893 jio_fprintf(defaultStream::error_stream(),
1894 "Invalid maximum heap size: %s\n", option->optionString);
1895 describe_range_error(errcode);
1896 return JNI_EINVAL;
1897 }
1898 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1899 // Xmaxf
1900 } else if (match_option(option, "-Xmaxf", &tail)) {
1901 int maxf = (int)(atof(tail) * 100);
1902 if (maxf < 0 || maxf > 100) {
1903 jio_fprintf(defaultStream::error_stream(),
1904 "Bad max heap free percentage size: %s\n",
1905 option->optionString);
1906 return JNI_EINVAL;
1907 } else {
1908 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1909 }
1910 // Xminf
1911 } else if (match_option(option, "-Xminf", &tail)) {
1912 int minf = (int)(atof(tail) * 100);
1913 if (minf < 0 || minf > 100) {
1914 jio_fprintf(defaultStream::error_stream(),
1915 "Bad min heap free percentage size: %s\n",
1916 option->optionString);
1917 return JNI_EINVAL;
1918 } else {
1919 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1920 }
1921 // -Xss
1922 } else if (match_option(option, "-Xss", &tail)) {
1923 julong long_ThreadStackSize = 0;
1924 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1925 if (errcode != arg_in_range) {
1926 jio_fprintf(defaultStream::error_stream(),
1927 "Invalid thread stack size: %s\n", option->optionString);
1928 describe_range_error(errcode);
1929 return JNI_EINVAL;
1930 }
1931 // Internally track ThreadStackSize in units of 1024 bytes.
1932 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1933 round_to((int)long_ThreadStackSize, K) / K);
1934 // -Xoss
1935 } else if (match_option(option, "-Xoss", &tail)) {
1936 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1937 // -Xmaxjitcodesize
1938 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1939 julong long_ReservedCodeCacheSize = 0;
1940 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1941 (size_t)InitialCodeCacheSize);
1942 if (errcode != arg_in_range) {
1943 jio_fprintf(defaultStream::error_stream(),
1944 "Invalid maximum code cache size: %s\n",
1945 option->optionString);
1946 describe_range_error(errcode);
1947 return JNI_EINVAL;
1948 }
1949 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1950 // -green
1951 } else if (match_option(option, "-green", &tail)) {
1952 jio_fprintf(defaultStream::error_stream(),
1953 "Green threads support not available\n");
1954 return JNI_EINVAL;
1955 // -native
1956 } else if (match_option(option, "-native", &tail)) {
1957 // HotSpot always uses native threads, ignore silently for compatibility
1958 // -Xsqnopause
1959 } else if (match_option(option, "-Xsqnopause", &tail)) {
1960 // EVM option, ignore silently for compatibility
1961 // -Xrs
1962 } else if (match_option(option, "-Xrs", &tail)) {
1963 // Classic/EVM option, new functionality
1964 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1965 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1966 // change default internal VM signals used - lower case for back compat
1967 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1968 // -Xoptimize
1969 } else if (match_option(option, "-Xoptimize", &tail)) {
1970 // EVM option, ignore silently for compatibility
1971 // -Xprof
1972 } else if (match_option(option, "-Xprof", &tail)) {
1973 #ifndef FPROF_KERNEL
1974 _has_profile = true;
1975 #else // FPROF_KERNEL
1976 // do we have to exit?
1977 warning("Kernel VM does not support flat profiling.");
1978 #endif // FPROF_KERNEL
1979 // -Xaprof
1980 } else if (match_option(option, "-Xaprof", &tail)) {
1981 _has_alloc_profile = true;
1982 // -Xconcurrentio
1983 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1984 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1985 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1986 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
1987 FLAG_SET_CMDLINE(bool, UseTLAB, false);
1988 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
1989
1990 // -Xinternalversion
1991 } else if (match_option(option, "-Xinternalversion", &tail)) {
1992 jio_fprintf(defaultStream::output_stream(), "%s\n",
1993 VM_Version::internal_vm_info_string());
1994 vm_exit(0);
1995 #ifndef PRODUCT
1996 // -Xprintflags
1997 } else if (match_option(option, "-Xprintflags", &tail)) {
1998 CommandLineFlags::printFlags();
1999 vm_exit(0);
2000 #endif
2001 // -D
2002 } else if (match_option(option, "-D", &tail)) {
2003 if (!add_property(tail)) {
2004 return JNI_ENOMEM;
2005 }
2006 // Out of the box management support
2007 if (match_option(option, "-Dcom.sun.management", &tail)) {
2008 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2009 }
2010 // -Xint
2011 } else if (match_option(option, "-Xint", &tail)) {
2012 set_mode_flags(_int);
2013 // -Xmixed
2014 } else if (match_option(option, "-Xmixed", &tail)) {
2015 set_mode_flags(_mixed);
2016 // -Xcomp
2017 } else if (match_option(option, "-Xcomp", &tail)) {
2018 // for testing the compiler; turn off all flags that inhibit compilation
2019 set_mode_flags(_comp);
2020
2021 // -Xshare:dump
2022 } else if (match_option(option, "-Xshare:dump", &tail)) {
2023 #ifdef TIERED
2024 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2025 set_mode_flags(_int); // Prevent compilation, which creates objects
2026 #elif defined(COMPILER2)
2027 vm_exit_during_initialization(
2028 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2029 #elif defined(KERNEL)
2030 vm_exit_during_initialization(
2031 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2032 #else
2033 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2034 set_mode_flags(_int); // Prevent compilation, which creates objects
2035 #endif
2036 // -Xshare:on
2037 } else if (match_option(option, "-Xshare:on", &tail)) {
2038 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2039 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2040 #ifdef TIERED
2041 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2042 #endif // TIERED
2043 // -Xshare:auto
2044 } else if (match_option(option, "-Xshare:auto", &tail)) {
2045 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2046 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2047 // -Xshare:off
2048 } else if (match_option(option, "-Xshare:off", &tail)) {
2049 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2050 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2051
2052 // -Xverify
2053 } else if (match_option(option, "-Xverify", &tail)) {
2054 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2055 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2056 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2057 } else if (strcmp(tail, ":remote") == 0) {
2058 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2059 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2060 } else if (strcmp(tail, ":none") == 0) {
2061 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2062 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2063 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2064 return JNI_EINVAL;
2065 }
2066 // -Xdebug
2067 } else if (match_option(option, "-Xdebug", &tail)) {
2068 // note this flag has been used, then ignore
2069 set_xdebug_mode(true);
2070 // -Xnoagent
2071 } else if (match_option(option, "-Xnoagent", &tail)) {
2072 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2073 } else if (match_option(option, "-Xboundthreads", &tail)) {
2074 // Bind user level threads to kernel threads (Solaris only)
2075 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2076 } else if (match_option(option, "-Xloggc:", &tail)) {
2077 // Redirect GC output to the file. -Xloggc:<filename>
2078 // ostream_init_log(), when called will use this filename
2079 // to initialize a fileStream.
2080 _gc_log_filename = strdup(tail);
2081 FLAG_SET_CMDLINE(bool, PrintGC, true);
2082 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2083 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2084
2085 // JNI hooks
2086 } else if (match_option(option, "-Xcheck", &tail)) {
2087 if (!strcmp(tail, ":jni")) {
2088 CheckJNICalls = true;
2089 } else if (is_bad_option(option, args->ignoreUnrecognized,
2090 "check")) {
2091 return JNI_EINVAL;
2092 }
2093 } else if (match_option(option, "vfprintf", &tail)) {
2094 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2095 } else if (match_option(option, "exit", &tail)) {
2096 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2097 } else if (match_option(option, "abort", &tail)) {
2098 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2099 // -XX:+AggressiveHeap
2100 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2101
2102 // This option inspects the machine and attempts to set various
2103 // parameters to be optimal for long-running, memory allocation
2104 // intensive jobs. It is intended for machines with large
2105 // amounts of cpu and memory.
2106
2107 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2108 // VM, but we may not be able to represent the total physical memory
2109 // available (like having 8gb of memory on a box but using a 32bit VM).
2110 // Thus, we need to make sure we're using a julong for intermediate
2111 // calculations.
2112 julong initHeapSize;
2113 julong total_memory = os::physical_memory();
2114
2115 if (total_memory < (julong)256*M) {
2116 jio_fprintf(defaultStream::error_stream(),
2117 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2118 vm_exit(1);
2119 }
2120
2121 // The heap size is half of available memory, or (at most)
2122 // all of possible memory less 160mb (leaving room for the OS
2123 // when using ISM). This is the maximum; because adaptive sizing
2124 // is turned on below, the actual space used may be smaller.
2125
2126 initHeapSize = MIN2(total_memory / (julong)2,
2127 total_memory - (julong)160*M);
2128
2129 // Make sure that if we have a lot of memory we cap the 32 bit
2130 // process space. The 64bit VM version of this function is a nop.
2131 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2132
2133 // The perm gen is separate but contiguous with the
2134 // object heap (and is reserved with it) so subtract it
2135 // from the heap size.
2136 if (initHeapSize > MaxPermSize) {
2137 initHeapSize = initHeapSize - MaxPermSize;
2138 } else {
2139 warning("AggressiveHeap and MaxPermSize values may conflict");
2140 }
2141
2142 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2143 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2144 set_initial_heap_size(MaxHeapSize);
2145 // Currently the minimum size and the initial heap sizes are the same.
2146 set_min_heap_size(initial_heap_size());
2147 }
2148 if (FLAG_IS_DEFAULT(NewSize)) {
2149 // Make the young generation 3/8ths of the total heap.
2150 FLAG_SET_CMDLINE(uintx, NewSize,
2151 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2152 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2153 }
2154
2155 FLAG_SET_DEFAULT(UseLargePages, true);
2156
2157 // Increase some data structure sizes for efficiency
2158 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2159 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2160 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2161
2162 // See the OldPLABSize comment below, but replace 'after promotion'
2163 // with 'after copying'. YoungPLABSize is the size of the survivor
2164 // space per-gc-thread buffers. The default is 4kw.
2165 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2166
2167 // OldPLABSize is the size of the buffers in the old gen that
2168 // UseParallelGC uses to promote live data that doesn't fit in the
2169 // survivor spaces. At any given time, there's one for each gc thread.
2170 // The default size is 1kw. These buffers are rarely used, since the
2171 // survivor spaces are usually big enough. For specjbb, however, there
2172 // are occasions when there's lots of live data in the young gen
2173 // and we end up promoting some of it. We don't have a definite
2174 // explanation for why bumping OldPLABSize helps, but the theory
2175 // is that a bigger PLAB results in retaining something like the
2176 // original allocation order after promotion, which improves mutator
2177 // locality. A minor effect may be that larger PLABs reduce the
2178 // number of PLAB allocation events during gc. The value of 8kw
2179 // was arrived at by experimenting with specjbb.
2180 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2181
2182 // CompilationPolicyChoice=0 causes the server compiler to adopt
2183 // a more conservative which-method-do-I-compile policy when one
2184 // of the counters maintained by the interpreter trips. The
2185 // result is reduced startup time and improved specjbb and
2186 // alacrity performance. Zero is the default, but we set it
2187 // explicitly here in case the default changes.
2188 // See runtime/compilationPolicy.*.
2189 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2190
2191 // Enable parallel GC and adaptive generation sizing
2192 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2193 FLAG_SET_DEFAULT(ParallelGCThreads,
2194 Abstract_VM_Version::parallel_worker_threads());
2195
2196 // Encourage steady state memory management
2197 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2198
2199 // This appears to improve mutator locality
2200 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2201
2202 // Get around early Solaris scheduling bug
2203 // (affinity vs other jobs on system)
2204 // but disallow DR and offlining (5008695).
2205 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2206
2207 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2208 // The last option must always win.
2209 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2210 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2211 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2212 // The last option must always win.
2213 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2214 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2215 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2216 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2217 jio_fprintf(defaultStream::error_stream(),
2218 "Please use CMSClassUnloadingEnabled in place of "
2219 "CMSPermGenSweepingEnabled in the future\n");
2220 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2221 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2222 jio_fprintf(defaultStream::error_stream(),
2223 "Please use -XX:+UseGCOverheadLimit in place of "
2224 "-XX:+UseGCTimeLimit in the future\n");
2225 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2226 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2227 jio_fprintf(defaultStream::error_stream(),
2228 "Please use -XX:-UseGCOverheadLimit in place of "
2229 "-XX:-UseGCTimeLimit in the future\n");
2230 // The TLE options are for compatibility with 1.3 and will be
2231 // removed without notice in a future release. These options
2232 // are not to be documented.
2233 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2234 // No longer used.
2235 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2236 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2237 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2238 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2239 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2240 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2241 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2242 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2243 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2244 // No longer used.
2245 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2246 julong long_tlab_size = 0;
2247 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2248 if (errcode != arg_in_range) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Invalid TLAB size: %s\n", option->optionString);
2251 describe_range_error(errcode);
2252 return JNI_EINVAL;
2253 }
2254 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2255 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2256 // No longer used.
2257 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2258 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2259 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2260 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2261 SOLARIS_ONLY(
2262 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2263 warning("-XX:+UsePermISM is obsolete.");
2264 FLAG_SET_CMDLINE(bool, UseISM, true);
2265 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2266 FLAG_SET_CMDLINE(bool, UseISM, false);
2267 )
2268 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2269 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2270 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2271 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2272 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2273 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2274 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2275 #ifdef SOLARIS
2276 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2277 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2278 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2279 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2280 #else // ndef SOLARIS
2281 jio_fprintf(defaultStream::error_stream(),
2282 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2283 return JNI_EINVAL;
2284 #endif // ndef SOLARIS
2285 } else
2286 #ifdef ASSERT
2287 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2288 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2289 // disable scavenge before parallel mark-compact
2290 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2291 } else
2292 #endif
2293 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2294 julong cms_blocks_to_claim = (julong)atol(tail);
2295 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2296 jio_fprintf(defaultStream::error_stream(),
2297 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2298 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2299 } else
2300 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2301 julong old_plab_size = 0;
2302 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2303 if (errcode != arg_in_range) {
2304 jio_fprintf(defaultStream::error_stream(),
2305 "Invalid old PLAB size: %s\n", option->optionString);
2306 describe_range_error(errcode);
2307 return JNI_EINVAL;
2308 }
2309 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2310 jio_fprintf(defaultStream::error_stream(),
2311 "Please use -XX:OldPLABSize in place of "
2312 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2313 } else
2314 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2315 julong young_plab_size = 0;
2316 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2317 if (errcode != arg_in_range) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Invalid young PLAB size: %s\n", option->optionString);
2320 describe_range_error(errcode);
2321 return JNI_EINVAL;
2322 }
2323 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2324 jio_fprintf(defaultStream::error_stream(),
2325 "Please use -XX:YoungPLABSize in place of "
2326 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2327 } else
2328 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2329 // Skip -XX:Flags= since that case has already been handled
2330 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2331 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2332 return JNI_EINVAL;
2333 }
2334 }
2335 // Unknown option
2336 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2337 return JNI_ERR;
2338 }
2339 }
2340 // Change the default value for flags which have different default values
2341 // when working with older JDKs.
2342 if (JDK_Version::current().compare_major(6) <= 0 &&
2343 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2344 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2345 }
2346 return JNI_OK;
2347 }
2348
2349 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2350 // This must be done after all -D arguments have been processed.
2351 scp_p->expand_endorsed();
2352
2353 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2354 // Assemble the bootclasspath elements into the final path.
2355 Arguments::set_sysclasspath(scp_p->combined_path());
2356 }
2357
2358 // This must be done after all arguments have been processed.
2359 // java_compiler() true means set to "NONE" or empty.
2360 if (java_compiler() && !xdebug_mode()) {
2361 // For backwards compatibility, we switch to interpreted mode if
2362 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2363 // not specified.
2364 set_mode_flags(_int);
2365 }
2366 if (CompileThreshold == 0) {
2367 set_mode_flags(_int);
2368 }
2369
2370 #ifdef TIERED
2371 // If we are using tiered compilation in the tiered vm then c1 will
2372 // do the profiling and we don't want to waste that time in the
2373 // interpreter.
2374 if (TieredCompilation) {
2375 ProfileInterpreter = false;
2376 } else {
2377 // Since we are running vanilla server we must adjust the compile threshold
2378 // unless the user has already adjusted it because the default threshold assumes
2379 // we will run tiered.
2380
2381 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2382 CompileThreshold = Tier2CompileThreshold;
2383 }
2384 }
2385 #endif // TIERED
2386
2387 #ifndef COMPILER2
2388 // Don't degrade server performance for footprint
2389 if (FLAG_IS_DEFAULT(UseLargePages) &&
2390 MaxHeapSize < LargePageHeapSizeThreshold) {
2391 // No need for large granularity pages w/small heaps.
2392 // Note that large pages are enabled/disabled for both the
2393 // Java heap and the code cache.
2394 FLAG_SET_DEFAULT(UseLargePages, false);
2395 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2396 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2397 }
2398
2399 #else
2400 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2401 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2402 }
2403 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2404 if (UseG1GC) {
2405 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2406 }
2407 #endif
2408
2409 if (!check_vm_args_consistency()) {
2410 return JNI_ERR;
2411 }
2412
2413 return JNI_OK;
2414 }
2415
2416 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2417 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2418 scp_assembly_required_p);
2419 }
2420
2421 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2422 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2423 scp_assembly_required_p);
2424 }
2425
2426 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2427 const int N_MAX_OPTIONS = 64;
2428 const int OPTION_BUFFER_SIZE = 1024;
2429 char buffer[OPTION_BUFFER_SIZE];
2430
2431 // The variable will be ignored if it exceeds the length of the buffer.
2432 // Don't check this variable if user has special privileges
2433 // (e.g. unix su command).
2434 if (os::getenv(name, buffer, sizeof(buffer)) &&
2435 !os::have_special_privileges()) {
2436 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Picked up %s: %s\n", name, buffer);
2439 char* rd = buffer; // pointer to the input string (rd)
2440 int i;
2441 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2442 while (isspace(*rd)) rd++; // skip whitespace
2443 if (*rd == 0) break; // we re done when the input string is read completely
2444
2445 // The output, option string, overwrites the input string.
2446 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2447 // input string (rd).
2448 char* wrt = rd;
2449
2450 options[i++].optionString = wrt; // Fill in option
2451 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2452 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2453 int quote = *rd; // matching quote to look for
2454 rd++; // don't copy open quote
2455 while (*rd != quote) { // include everything (even spaces) up until quote
2456 if (*rd == 0) { // string termination means unmatched string
2457 jio_fprintf(defaultStream::error_stream(),
2458 "Unmatched quote in %s\n", name);
2459 return JNI_ERR;
2460 }
2461 *wrt++ = *rd++; // copy to option string
2462 }
2463 rd++; // don't copy close quote
2464 } else {
2465 *wrt++ = *rd++; // copy to option string
2466 }
2467 }
2468 // Need to check if we're done before writing a NULL,
2469 // because the write could be to the byte that rd is pointing to.
2470 if (*rd++ == 0) {
2471 *wrt = 0;
2472 break;
2473 }
2474 *wrt = 0; // Zero terminate option
2475 }
2476 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2477 JavaVMInitArgs vm_args;
2478 vm_args.version = JNI_VERSION_1_2;
2479 vm_args.options = options;
2480 vm_args.nOptions = i;
2481 vm_args.ignoreUnrecognized = false;
2482
2483 if (PrintVMOptions) {
2484 const char* tail;
2485 for (int i = 0; i < vm_args.nOptions; i++) {
2486 const JavaVMOption *option = vm_args.options + i;
2487 if (match_option(option, "-XX:", &tail)) {
2488 logOption(tail);
2489 }
2490 }
2491 }
2492
2493 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2494 }
2495 return JNI_OK;
2496 }
2497
2498 // Parse entry point called from JNI_CreateJavaVM
2499
2500 jint Arguments::parse(const JavaVMInitArgs* args) {
2501
2502 // Sharing support
2503 // Construct the path to the archive
2504 char jvm_path[JVM_MAXPATHLEN];
2505 os::jvm_path(jvm_path, sizeof(jvm_path));
2506 #ifdef TIERED
2507 if (strstr(jvm_path, "client") != NULL) {
2508 force_client_mode = true;
2509 }
2510 #endif // TIERED
2511 char *end = strrchr(jvm_path, *os::file_separator());
2512 if (end != NULL) *end = '\0';
2513 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2514 strlen(os::file_separator()) + 20);
2515 if (shared_archive_path == NULL) return JNI_ENOMEM;
2516 strcpy(shared_archive_path, jvm_path);
2517 strcat(shared_archive_path, os::file_separator());
2518 strcat(shared_archive_path, "classes");
2519 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2520 strcat(shared_archive_path, ".jsa");
2521 SharedArchivePath = shared_archive_path;
2522
2523 // Remaining part of option string
2524 const char* tail;
2525
2526 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2527 bool settings_file_specified = false;
2528 int index;
2529 for (index = 0; index < args->nOptions; index++) {
2530 const JavaVMOption *option = args->options + index;
2531 if (match_option(option, "-XX:Flags=", &tail)) {
2532 if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {
2533 return JNI_EINVAL;
2534 }
2535 settings_file_specified = true;
2536 }
2537 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2538 PrintVMOptions = true;
2539 }
2540 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2541 PrintVMOptions = false;
2542 }
2543 }
2544
2545 // Parse default .hotspotrc settings file
2546 if (!settings_file_specified) {
2547 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2548 return JNI_EINVAL;
2549 }
2550 }
2551
2552 if (PrintVMOptions) {
2553 for (index = 0; index < args->nOptions; index++) {
2554 const JavaVMOption *option = args->options + index;
2555 if (match_option(option, "-XX:", &tail)) {
2556 logOption(tail);
2557 }
2558 }
2559 }
2560
2561
2562 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2563 jint result = parse_vm_init_args(args);
2564 if (result != JNI_OK) {
2565 return result;
2566 }
2567
2568 // These are hacks until G1 is fully supported and tested
2569 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
2570 if (UseG1GC) {
2571 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
2572 #ifndef PRODUCT
2573 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
2574 #endif // PRODUCT
2575 UseConcMarkSweepGC = false;
2576 UseParNewGC = false;
2577 UseParallelGC = false;
2578 UseParallelOldGC = false;
2579 UseSerialGC = false;
2580 }
2581 no_shared_spaces();
2582 }
2583
2584 #ifndef PRODUCT
2585 if (TraceBytecodesAt != 0) {
2586 TraceBytecodes = true;
2587 }
2588 if (CountCompiledCalls) {
2589 if (UseCounterDecay) {
2590 warning("UseCounterDecay disabled because CountCalls is set");
2591 UseCounterDecay = false;
2592 }
2593 }
2594 #endif // PRODUCT
2595
2596 if (PrintGCDetails) {
2597 // Turn on -verbose:gc options as well
2598 PrintGC = true;
2599 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2600 TraceClassUnloading = true;
2601 }
2602 }
2603
2604 #ifdef SERIALGC
2605 set_serial_gc_flags();
2606 #endif // SERIALGC
2607 #ifdef KERNEL
2608 no_shared_spaces();
2609 #endif // KERNEL
2610
2611 // Set flags based on ergonomics.
2612 set_ergonomics_flags();
2613
2614 // Check the GC selections again.
2615 if (!check_gc_consistency()) {
2616 return JNI_EINVAL;
2617 }
2618
2619 if (UseParallelGC || UseParallelOldGC) {
2620 // Set some flags for ParallelGC if needed.
2621 set_parallel_gc_flags();
2622 } else if (UseConcMarkSweepGC) {
2623 // Set some flags for CMS
2624 set_cms_and_parnew_gc_flags();
2625 } else if (UseParNewGC) {
2626 // Set some flags for ParNew
2627 set_parnew_gc_flags();
2628 }
2629 // Temporary; make the "if" an "else-if" before
2630 // we integrate G1. XXX
2631 if (UseG1GC) {
2632 // Set some flags for garbage-first, if needed.
2633 set_g1_gc_flags();
2634 }
2635
2636 #ifdef SERIALGC
2637 assert(verify_serial_gc_flags(), "SerialGC unset");
2638 #endif // SERIALGC
2639
2640 // Set bytecode rewriting flags
2641 set_bytecode_flags();
2642
2643 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2644 set_aggressive_opts_flags();
2645
2646 #ifdef CC_INTERP
2647 // Biased locking is not implemented with c++ interpreter
2648 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2649 #endif /* CC_INTERP */
2650
2651 #ifdef COMPILER2
2652 if (!UseBiasedLocking || EmitSync != 0) {
2653 UseOptoBiasInlining = false;
2654 }
2655 #endif
2656
2657 if (PrintCommandLineFlags) {
2658 CommandLineFlags::printSetFlags();
2659 }
2660
2661 #ifdef ASSERT
2662 if (PrintFlagsFinal) {
2663 CommandLineFlags::printFlags();
2664 }
2665 #endif
2666
2667 return JNI_OK;
2668 }
2669
2670 int Arguments::PropertyList_count(SystemProperty* pl) {
2671 int count = 0;
2672 while(pl != NULL) {
2673 count++;
2674 pl = pl->next();
2675 }
2676 return count;
2677 }
2678
2679 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2680 assert(key != NULL, "just checking");
2681 SystemProperty* prop;
2682 for (prop = pl; prop != NULL; prop = prop->next()) {
2683 if (strcmp(key, prop->key()) == 0) return prop->value();
2684 }
2685 return NULL;
2686 }
2687
2688 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2689 int count = 0;
2690 const char* ret_val = NULL;
2691
2692 while(pl != NULL) {
2693 if(count >= index) {
2694 ret_val = pl->key();
2695 break;
2696 }
2697 count++;
2698 pl = pl->next();
2699 }
2700
2701 return ret_val;
2702 }
2703
2704 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2705 int count = 0;
2706 char* ret_val = NULL;
2707
2708 while(pl != NULL) {
2709 if(count >= index) {
2710 ret_val = pl->value();
2711 break;
2712 }
2713 count++;
2714 pl = pl->next();
2715 }
2716
2717 return ret_val;
2718 }
2719
2720 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2721 SystemProperty* p = *plist;
2722 if (p == NULL) {
2723 *plist = new_p;
2724 } else {
2725 while (p->next() != NULL) {
2726 p = p->next();
2727 }
2728 p->set_next(new_p);
2729 }
2730 }
2731
2732 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2733 if (plist == NULL)
2734 return;
2735
2736 SystemProperty* new_p = new SystemProperty(k, v, true);
2737 PropertyList_add(plist, new_p);
2738 }
2739
2740 // This add maintains unique property key in the list.
2741 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
2742 if (plist == NULL)
2743 return;
2744
2745 // If property key exist then update with new value.
2746 SystemProperty* prop;
2747 for (prop = *plist; prop != NULL; prop = prop->next()) {
2748 if (strcmp(k, prop->key()) == 0) {
2749 prop->set_value(v);
2750 return;
2751 }
2752 }
2753
2754 PropertyList_add(plist, k, v);
2755 }
2756
2757 #ifdef KERNEL
2758 char *Arguments::get_kernel_properties() {
2759 // Find properties starting with kernel and append them to string
2760 // We need to find out how long they are first because the URL's that they
2761 // might point to could get long.
2762 int length = 0;
2763 SystemProperty* prop;
2764 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2765 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2766 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2767 }
2768 }
2769 // Add one for null terminator.
2770 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2771 if (length != 0) {
2772 int pos = 0;
2773 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2774 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2775 jio_snprintf(&props[pos], length-pos,
2776 "-D%s=%s ", prop->key(), prop->value());
2777 pos = strlen(props);
2778 }
2779 }
2780 }
2781 // null terminate props in case of null
2782 props[length] = '\0';
2783 return props;
2784 }
2785 #endif // KERNEL
2786
2787 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2788 // Returns true if all of the source pointed by src has been copied over to
2789 // the destination buffer pointed by buf. Otherwise, returns false.
2790 // Notes:
2791 // 1. If the length (buflen) of the destination buffer excluding the
2792 // NULL terminator character is not long enough for holding the expanded
2793 // pid characters, it also returns false instead of returning the partially
2794 // expanded one.
2795 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2796 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2797 char* buf, size_t buflen) {
2798 const char* p = src;
2799 char* b = buf;
2800 const char* src_end = &src[srclen];
2801 char* buf_end = &buf[buflen - 1];
2802
2803 while (p < src_end && b < buf_end) {
2804 if (*p == '%') {
2805 switch (*(++p)) {
2806 case '%': // "%%" ==> "%"
2807 *b++ = *p++;
2808 break;
2809 case 'p': { // "%p" ==> current process id
2810 // buf_end points to the character before the last character so
2811 // that we could write '\0' to the end of the buffer.
2812 size_t buf_sz = buf_end - b + 1;
2813 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2814
2815 // if jio_snprintf fails or the buffer is not long enough to hold
2816 // the expanded pid, returns false.
2817 if (ret < 0 || ret >= (int)buf_sz) {
2818 return false;
2819 } else {
2820 b += ret;
2821 assert(*b == '\0', "fail in copy_expand_pid");
2822 if (p == src_end && b == buf_end + 1) {
2823 // reach the end of the buffer.
2824 return true;
2825 }
2826 }
2827 p++;
2828 break;
2829 }
2830 default :
2831 *b++ = '%';
2832 }
2833 } else {
2834 *b++ = *p++;
2835 }
2836 }
2837 *b = '\0';
2838 return (p == src_end); // return false if not all of the source was copied
2839 }