Mon, 23 Aug 2010 08:44:03 -0700
Merge
1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_min_heap_size = 0;
41 Arguments::Mode Arguments::_mode = _mixed;
42 bool Arguments::_java_compiler = false;
43 bool Arguments::_xdebug_mode = false;
44 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
45 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
46 int Arguments::_sun_java_launcher_pid = -1;
48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
49 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
50 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
51 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
52 bool Arguments::_ClipInlining = ClipInlining;
53 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
55 char* Arguments::SharedArchivePath = NULL;
57 AgentLibraryList Arguments::_libraryList;
58 AgentLibraryList Arguments::_agentList;
60 abort_hook_t Arguments::_abort_hook = NULL;
61 exit_hook_t Arguments::_exit_hook = NULL;
62 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
65 SystemProperty *Arguments::_java_ext_dirs = NULL;
66 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
67 SystemProperty *Arguments::_sun_boot_library_path = NULL;
68 SystemProperty *Arguments::_java_library_path = NULL;
69 SystemProperty *Arguments::_java_home = NULL;
70 SystemProperty *Arguments::_java_class_path = NULL;
71 SystemProperty *Arguments::_sun_boot_class_path = NULL;
73 char* Arguments::_meta_index_path = NULL;
74 char* Arguments::_meta_index_dir = NULL;
76 static bool force_client_mode = false;
78 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
80 static bool match_option(const JavaVMOption *option, const char* name,
81 const char** tail) {
82 int len = (int)strlen(name);
83 if (strncmp(option->optionString, name, len) == 0) {
84 *tail = option->optionString + len;
85 return true;
86 } else {
87 return false;
88 }
89 }
91 static void logOption(const char* opt) {
92 if (PrintVMOptions) {
93 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
94 }
95 }
97 // Process java launcher properties.
98 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
99 // See if sun.java.launcher or sun.java.launcher.pid is defined.
100 // Must do this before setting up other system properties,
101 // as some of them may depend on launcher type.
102 for (int index = 0; index < args->nOptions; index++) {
103 const JavaVMOption* option = args->options + index;
104 const char* tail;
106 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
107 process_java_launcher_argument(tail, option->extraInfo);
108 continue;
109 }
110 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
111 _sun_java_launcher_pid = atoi(tail);
112 continue;
113 }
114 }
115 }
117 // Initialize system properties key and value.
118 void Arguments::init_system_properties() {
120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
122 "Java Virtual Machine Specification", false));
123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
124 "Sun Microsystems Inc.", false));
125 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
130 // following are JVMTI agent writeable properties.
131 // Properties values are set to NULL and they are
132 // os specific they are initialized in os::init_system_properties_values().
133 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
134 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
135 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
136 _java_library_path = new SystemProperty("java.library.path", NULL, true);
137 _java_home = new SystemProperty("java.home", NULL, true);
138 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
140 _java_class_path = new SystemProperty("java.class.path", "", true);
142 // Add to System Property list.
143 PropertyList_add(&_system_properties, _java_ext_dirs);
144 PropertyList_add(&_system_properties, _java_endorsed_dirs);
145 PropertyList_add(&_system_properties, _sun_boot_library_path);
146 PropertyList_add(&_system_properties, _java_library_path);
147 PropertyList_add(&_system_properties, _java_home);
148 PropertyList_add(&_system_properties, _java_class_path);
149 PropertyList_add(&_system_properties, _sun_boot_class_path);
151 // Set OS specific system properties values
152 os::init_system_properties_values();
153 }
155 /**
156 * Provide a slightly more user-friendly way of eliminating -XX flags.
157 * When a flag is eliminated, it can be added to this list in order to
158 * continue accepting this flag on the command-line, while issuing a warning
159 * and ignoring the value. Once the JDK version reaches the 'accept_until'
160 * limit, we flatly refuse to admit the existence of the flag. This allows
161 * a flag to die correctly over JDK releases using HSX.
162 */
163 typedef struct {
164 const char* name;
165 JDK_Version obsoleted_in; // when the flag went away
166 JDK_Version accept_until; // which version to start denying the existence
167 } ObsoleteFlag;
169 static ObsoleteFlag obsolete_jvm_flags[] = {
170 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
171 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
184 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
185 { "DefaultInitialRAMFraction",
186 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
187 { "UseDepthFirstScavengeOrder",
188 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
189 { NULL, JDK_Version(0), JDK_Version(0) }
190 };
192 // Returns true if the flag is obsolete and fits into the range specified
193 // for being ignored. In the case that the flag is ignored, the 'version'
194 // value is filled in with the version number when the flag became
195 // obsolete so that that value can be displayed to the user.
196 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
197 int i = 0;
198 assert(version != NULL, "Must provide a version buffer");
199 while (obsolete_jvm_flags[i].name != NULL) {
200 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
201 // <flag>=xxx form
202 // [-|+]<flag> form
203 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
204 ((s[0] == '+' || s[0] == '-') &&
205 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
206 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
207 *version = flag_status.obsoleted_in;
208 return true;
209 }
210 }
211 i++;
212 }
213 return false;
214 }
216 // Constructs the system class path (aka boot class path) from the following
217 // components, in order:
218 //
219 // prefix // from -Xbootclasspath/p:...
220 // endorsed // the expansion of -Djava.endorsed.dirs=...
221 // base // from os::get_system_properties() or -Xbootclasspath=
222 // suffix // from -Xbootclasspath/a:...
223 //
224 // java.endorsed.dirs is a list of directories; any jar or zip files in the
225 // directories are added to the sysclasspath just before the base.
226 //
227 // This could be AllStatic, but it isn't needed after argument processing is
228 // complete.
229 class SysClassPath: public StackObj {
230 public:
231 SysClassPath(const char* base);
232 ~SysClassPath();
234 inline void set_base(const char* base);
235 inline void add_prefix(const char* prefix);
236 inline void add_suffix_to_prefix(const char* suffix);
237 inline void add_suffix(const char* suffix);
238 inline void reset_path(const char* base);
240 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
241 // property. Must be called after all command-line arguments have been
242 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
243 // combined_path().
244 void expand_endorsed();
246 inline const char* get_base() const { return _items[_scp_base]; }
247 inline const char* get_prefix() const { return _items[_scp_prefix]; }
248 inline const char* get_suffix() const { return _items[_scp_suffix]; }
249 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
251 // Combine all the components into a single c-heap-allocated string; caller
252 // must free the string if/when no longer needed.
253 char* combined_path();
255 private:
256 // Utility routines.
257 static char* add_to_path(const char* path, const char* str, bool prepend);
258 static char* add_jars_to_path(char* path, const char* directory);
260 inline void reset_item_at(int index);
262 // Array indices for the items that make up the sysclasspath. All except the
263 // base are allocated in the C heap and freed by this class.
264 enum {
265 _scp_prefix, // from -Xbootclasspath/p:...
266 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
267 _scp_base, // the default sysclasspath
268 _scp_suffix, // from -Xbootclasspath/a:...
269 _scp_nitems // the number of items, must be last.
270 };
272 const char* _items[_scp_nitems];
273 DEBUG_ONLY(bool _expansion_done;)
274 };
276 SysClassPath::SysClassPath(const char* base) {
277 memset(_items, 0, sizeof(_items));
278 _items[_scp_base] = base;
279 DEBUG_ONLY(_expansion_done = false;)
280 }
282 SysClassPath::~SysClassPath() {
283 // Free everything except the base.
284 for (int i = 0; i < _scp_nitems; ++i) {
285 if (i != _scp_base) reset_item_at(i);
286 }
287 DEBUG_ONLY(_expansion_done = false;)
288 }
290 inline void SysClassPath::set_base(const char* base) {
291 _items[_scp_base] = base;
292 }
294 inline void SysClassPath::add_prefix(const char* prefix) {
295 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
296 }
298 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
299 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
300 }
302 inline void SysClassPath::add_suffix(const char* suffix) {
303 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
304 }
306 inline void SysClassPath::reset_item_at(int index) {
307 assert(index < _scp_nitems && index != _scp_base, "just checking");
308 if (_items[index] != NULL) {
309 FREE_C_HEAP_ARRAY(char, _items[index]);
310 _items[index] = NULL;
311 }
312 }
314 inline void SysClassPath::reset_path(const char* base) {
315 // Clear the prefix and suffix.
316 reset_item_at(_scp_prefix);
317 reset_item_at(_scp_suffix);
318 set_base(base);
319 }
321 //------------------------------------------------------------------------------
323 void SysClassPath::expand_endorsed() {
324 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
326 const char* path = Arguments::get_property("java.endorsed.dirs");
327 if (path == NULL) {
328 path = Arguments::get_endorsed_dir();
329 assert(path != NULL, "no default for java.endorsed.dirs");
330 }
332 char* expanded_path = NULL;
333 const char separator = *os::path_separator();
334 const char* const end = path + strlen(path);
335 while (path < end) {
336 const char* tmp_end = strchr(path, separator);
337 if (tmp_end == NULL) {
338 expanded_path = add_jars_to_path(expanded_path, path);
339 path = end;
340 } else {
341 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
342 memcpy(dirpath, path, tmp_end - path);
343 dirpath[tmp_end - path] = '\0';
344 expanded_path = add_jars_to_path(expanded_path, dirpath);
345 FREE_C_HEAP_ARRAY(char, dirpath);
346 path = tmp_end + 1;
347 }
348 }
349 _items[_scp_endorsed] = expanded_path;
350 DEBUG_ONLY(_expansion_done = true;)
351 }
353 // Combine the bootclasspath elements, some of which may be null, into a single
354 // c-heap-allocated string.
355 char* SysClassPath::combined_path() {
356 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
357 assert(_expansion_done, "must call expand_endorsed() first.");
359 size_t lengths[_scp_nitems];
360 size_t total_len = 0;
362 const char separator = *os::path_separator();
364 // Get the lengths.
365 int i;
366 for (i = 0; i < _scp_nitems; ++i) {
367 if (_items[i] != NULL) {
368 lengths[i] = strlen(_items[i]);
369 // Include space for the separator char (or a NULL for the last item).
370 total_len += lengths[i] + 1;
371 }
372 }
373 assert(total_len > 0, "empty sysclasspath not allowed");
375 // Copy the _items to a single string.
376 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
377 char* cp_tmp = cp;
378 for (i = 0; i < _scp_nitems; ++i) {
379 if (_items[i] != NULL) {
380 memcpy(cp_tmp, _items[i], lengths[i]);
381 cp_tmp += lengths[i];
382 *cp_tmp++ = separator;
383 }
384 }
385 *--cp_tmp = '\0'; // Replace the extra separator.
386 return cp;
387 }
389 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
390 char*
391 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
392 char *cp;
394 assert(str != NULL, "just checking");
395 if (path == NULL) {
396 size_t len = strlen(str) + 1;
397 cp = NEW_C_HEAP_ARRAY(char, len);
398 memcpy(cp, str, len); // copy the trailing null
399 } else {
400 const char separator = *os::path_separator();
401 size_t old_len = strlen(path);
402 size_t str_len = strlen(str);
403 size_t len = old_len + str_len + 2;
405 if (prepend) {
406 cp = NEW_C_HEAP_ARRAY(char, len);
407 char* cp_tmp = cp;
408 memcpy(cp_tmp, str, str_len);
409 cp_tmp += str_len;
410 *cp_tmp = separator;
411 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
412 FREE_C_HEAP_ARRAY(char, path);
413 } else {
414 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
415 char* cp_tmp = cp + old_len;
416 *cp_tmp = separator;
417 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
418 }
419 }
420 return cp;
421 }
423 // Scan the directory and append any jar or zip files found to path.
424 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
425 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
426 DIR* dir = os::opendir(directory);
427 if (dir == NULL) return path;
429 char dir_sep[2] = { '\0', '\0' };
430 size_t directory_len = strlen(directory);
431 const char fileSep = *os::file_separator();
432 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
434 /* Scan the directory for jars/zips, appending them to path. */
435 struct dirent *entry;
436 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
437 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
438 const char* name = entry->d_name;
439 const char* ext = name + strlen(name) - 4;
440 bool isJarOrZip = ext > name &&
441 (os::file_name_strcmp(ext, ".jar") == 0 ||
442 os::file_name_strcmp(ext, ".zip") == 0);
443 if (isJarOrZip) {
444 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
445 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
446 path = add_to_path(path, jarpath, false);
447 FREE_C_HEAP_ARRAY(char, jarpath);
448 }
449 }
450 FREE_C_HEAP_ARRAY(char, dbuf);
451 os::closedir(dir);
452 return path;
453 }
455 // Parses a memory size specification string.
456 static bool atomull(const char *s, julong* result) {
457 julong n = 0;
458 int args_read = sscanf(s, os::julong_format_specifier(), &n);
459 if (args_read != 1) {
460 return false;
461 }
462 while (*s != '\0' && isdigit(*s)) {
463 s++;
464 }
465 // 4705540: illegal if more characters are found after the first non-digit
466 if (strlen(s) > 1) {
467 return false;
468 }
469 switch (*s) {
470 case 'T': case 't':
471 *result = n * G * K;
472 // Check for overflow.
473 if (*result/((julong)G * K) != n) return false;
474 return true;
475 case 'G': case 'g':
476 *result = n * G;
477 if (*result/G != n) return false;
478 return true;
479 case 'M': case 'm':
480 *result = n * M;
481 if (*result/M != n) return false;
482 return true;
483 case 'K': case 'k':
484 *result = n * K;
485 if (*result/K != n) return false;
486 return true;
487 case '\0':
488 *result = n;
489 return true;
490 default:
491 return false;
492 }
493 }
495 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
496 if (size < min_size) return arg_too_small;
497 // Check that size will fit in a size_t (only relevant on 32-bit)
498 if (size > max_uintx) return arg_too_big;
499 return arg_in_range;
500 }
502 // Describe an argument out of range error
503 void Arguments::describe_range_error(ArgsRange errcode) {
504 switch(errcode) {
505 case arg_too_big:
506 jio_fprintf(defaultStream::error_stream(),
507 "The specified size exceeds the maximum "
508 "representable size.\n");
509 break;
510 case arg_too_small:
511 case arg_unreadable:
512 case arg_in_range:
513 // do nothing for now
514 break;
515 default:
516 ShouldNotReachHere();
517 }
518 }
520 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
521 return CommandLineFlags::boolAtPut(name, &value, origin);
522 }
524 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
525 double v;
526 if (sscanf(value, "%lf", &v) != 1) {
527 return false;
528 }
530 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
531 return true;
532 }
533 return false;
534 }
536 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
537 julong v;
538 intx intx_v;
539 bool is_neg = false;
540 // Check the sign first since atomull() parses only unsigned values.
541 if (*value == '-') {
542 if (!CommandLineFlags::intxAt(name, &intx_v)) {
543 return false;
544 }
545 value++;
546 is_neg = true;
547 }
548 if (!atomull(value, &v)) {
549 return false;
550 }
551 intx_v = (intx) v;
552 if (is_neg) {
553 intx_v = -intx_v;
554 }
555 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
556 return true;
557 }
558 uintx uintx_v = (uintx) v;
559 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
560 return true;
561 }
562 uint64_t uint64_t_v = (uint64_t) v;
563 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
564 return true;
565 }
566 return false;
567 }
569 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
570 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
571 // Contract: CommandLineFlags always returns a pointer that needs freeing.
572 FREE_C_HEAP_ARRAY(char, value);
573 return true;
574 }
576 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
577 const char* old_value = "";
578 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
579 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
580 size_t new_len = strlen(new_value);
581 const char* value;
582 char* free_this_too = NULL;
583 if (old_len == 0) {
584 value = new_value;
585 } else if (new_len == 0) {
586 value = old_value;
587 } else {
588 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
589 // each new setting adds another LINE to the switch:
590 sprintf(buf, "%s\n%s", old_value, new_value);
591 value = buf;
592 free_this_too = buf;
593 }
594 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
595 // CommandLineFlags always returns a pointer that needs freeing.
596 FREE_C_HEAP_ARRAY(char, value);
597 if (free_this_too != NULL) {
598 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
599 FREE_C_HEAP_ARRAY(char, free_this_too);
600 }
601 return true;
602 }
604 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
606 // range of acceptable characters spelled out for portability reasons
607 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
608 #define BUFLEN 255
609 char name[BUFLEN+1];
610 char dummy;
612 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
613 return set_bool_flag(name, false, origin);
614 }
615 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
616 return set_bool_flag(name, true, origin);
617 }
619 char punct;
620 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
621 const char* value = strchr(arg, '=') + 1;
622 Flag* flag = Flag::find_flag(name, strlen(name));
623 if (flag != NULL && flag->is_ccstr()) {
624 if (flag->ccstr_accumulates()) {
625 return append_to_string_flag(name, value, origin);
626 } else {
627 if (value[0] == '\0') {
628 value = NULL;
629 }
630 return set_string_flag(name, value, origin);
631 }
632 }
633 }
635 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
636 const char* value = strchr(arg, '=') + 1;
637 // -XX:Foo:=xxx will reset the string flag to the given value.
638 if (value[0] == '\0') {
639 value = NULL;
640 }
641 return set_string_flag(name, value, origin);
642 }
644 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
645 #define SIGNED_NUMBER_RANGE "[-0123456789]"
646 #define NUMBER_RANGE "[0123456789]"
647 char value[BUFLEN + 1];
648 char value2[BUFLEN + 1];
649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
650 // Looks like a floating-point number -- try again with more lenient format string
651 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
652 return set_fp_numeric_flag(name, value, origin);
653 }
654 }
656 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
657 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
658 return set_numeric_flag(name, value, origin);
659 }
661 return false;
662 }
664 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
665 assert(bldarray != NULL, "illegal argument");
667 if (arg == NULL) {
668 return;
669 }
671 int index = *count;
673 // expand the array and add arg to the last element
674 (*count)++;
675 if (*bldarray == NULL) {
676 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
677 } else {
678 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
679 }
680 (*bldarray)[index] = strdup(arg);
681 }
683 void Arguments::build_jvm_args(const char* arg) {
684 add_string(&_jvm_args_array, &_num_jvm_args, arg);
685 }
687 void Arguments::build_jvm_flags(const char* arg) {
688 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
689 }
691 // utility function to return a string that concatenates all
692 // strings in a given char** array
693 const char* Arguments::build_resource_string(char** args, int count) {
694 if (args == NULL || count == 0) {
695 return NULL;
696 }
697 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
698 for (int i = 1; i < count; i++) {
699 length += strlen(args[i]) + 1; // add 1 for a space
700 }
701 char* s = NEW_RESOURCE_ARRAY(char, length);
702 strcpy(s, args[0]);
703 for (int j = 1; j < count; j++) {
704 strcat(s, " ");
705 strcat(s, args[j]);
706 }
707 return (const char*) s;
708 }
710 void Arguments::print_on(outputStream* st) {
711 st->print_cr("VM Arguments:");
712 if (num_jvm_flags() > 0) {
713 st->print("jvm_flags: "); print_jvm_flags_on(st);
714 }
715 if (num_jvm_args() > 0) {
716 st->print("jvm_args: "); print_jvm_args_on(st);
717 }
718 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
719 st->print_cr("Launcher Type: %s", _sun_java_launcher);
720 }
722 void Arguments::print_jvm_flags_on(outputStream* st) {
723 if (_num_jvm_flags > 0) {
724 for (int i=0; i < _num_jvm_flags; i++) {
725 st->print("%s ", _jvm_flags_array[i]);
726 }
727 st->print_cr("");
728 }
729 }
731 void Arguments::print_jvm_args_on(outputStream* st) {
732 if (_num_jvm_args > 0) {
733 for (int i=0; i < _num_jvm_args; i++) {
734 st->print("%s ", _jvm_args_array[i]);
735 }
736 st->print_cr("");
737 }
738 }
740 bool Arguments::process_argument(const char* arg,
741 jboolean ignore_unrecognized, FlagValueOrigin origin) {
743 JDK_Version since = JDK_Version();
745 if (parse_argument(arg, origin)) {
746 // do nothing
747 } else if (is_newly_obsolete(arg, &since)) {
748 enum { bufsize = 256 };
749 char buffer[bufsize];
750 since.to_string(buffer, bufsize);
751 jio_fprintf(defaultStream::error_stream(),
752 "Warning: The flag %s has been EOL'd as of %s and will"
753 " be ignored\n", arg, buffer);
754 } else {
755 if (!ignore_unrecognized) {
756 jio_fprintf(defaultStream::error_stream(),
757 "Unrecognized VM option '%s'\n", arg);
758 // allow for commandline "commenting out" options like -XX:#+Verbose
759 if (strlen(arg) == 0 || arg[0] != '#') {
760 return false;
761 }
762 }
763 }
764 return true;
765 }
767 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
768 FILE* stream = fopen(file_name, "rb");
769 if (stream == NULL) {
770 if (should_exist) {
771 jio_fprintf(defaultStream::error_stream(),
772 "Could not open settings file %s\n", file_name);
773 return false;
774 } else {
775 return true;
776 }
777 }
779 char token[1024];
780 int pos = 0;
782 bool in_white_space = true;
783 bool in_comment = false;
784 bool in_quote = false;
785 char quote_c = 0;
786 bool result = true;
788 int c = getc(stream);
789 while(c != EOF) {
790 if (in_white_space) {
791 if (in_comment) {
792 if (c == '\n') in_comment = false;
793 } else {
794 if (c == '#') in_comment = true;
795 else if (!isspace(c)) {
796 in_white_space = false;
797 token[pos++] = c;
798 }
799 }
800 } else {
801 if (c == '\n' || (!in_quote && isspace(c))) {
802 // token ends at newline, or at unquoted whitespace
803 // this allows a way to include spaces in string-valued options
804 token[pos] = '\0';
805 logOption(token);
806 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
807 build_jvm_flags(token);
808 pos = 0;
809 in_white_space = true;
810 in_quote = false;
811 } else if (!in_quote && (c == '\'' || c == '"')) {
812 in_quote = true;
813 quote_c = c;
814 } else if (in_quote && (c == quote_c)) {
815 in_quote = false;
816 } else {
817 token[pos++] = c;
818 }
819 }
820 c = getc(stream);
821 }
822 if (pos > 0) {
823 token[pos] = '\0';
824 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
825 build_jvm_flags(token);
826 }
827 fclose(stream);
828 return result;
829 }
831 //=============================================================================================================
832 // Parsing of properties (-D)
834 const char* Arguments::get_property(const char* key) {
835 return PropertyList_get_value(system_properties(), key);
836 }
838 bool Arguments::add_property(const char* prop) {
839 const char* eq = strchr(prop, '=');
840 char* key;
841 // ns must be static--its address may be stored in a SystemProperty object.
842 const static char ns[1] = {0};
843 char* value = (char *)ns;
845 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
846 key = AllocateHeap(key_len + 1, "add_property");
847 strncpy(key, prop, key_len);
848 key[key_len] = '\0';
850 if (eq != NULL) {
851 size_t value_len = strlen(prop) - key_len - 1;
852 value = AllocateHeap(value_len + 1, "add_property");
853 strncpy(value, &prop[key_len + 1], value_len + 1);
854 }
856 if (strcmp(key, "java.compiler") == 0) {
857 process_java_compiler_argument(value);
858 FreeHeap(key);
859 if (eq != NULL) {
860 FreeHeap(value);
861 }
862 return true;
863 } else if (strcmp(key, "sun.java.command") == 0) {
864 _java_command = value;
866 // don't add this property to the properties exposed to the java application
867 FreeHeap(key);
868 return true;
869 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
870 // launcher.pid property is private and is processed
871 // in process_sun_java_launcher_properties();
872 // the sun.java.launcher property is passed on to the java application
873 FreeHeap(key);
874 if (eq != NULL) {
875 FreeHeap(value);
876 }
877 return true;
878 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
879 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
880 // its value without going through the property list or making a Java call.
881 _java_vendor_url_bug = value;
882 } else if (strcmp(key, "sun.boot.library.path") == 0) {
883 PropertyList_unique_add(&_system_properties, key, value, true);
884 return true;
885 }
886 // Create new property and add at the end of the list
887 PropertyList_unique_add(&_system_properties, key, value);
888 return true;
889 }
891 //===========================================================================================================
892 // Setting int/mixed/comp mode flags
894 void Arguments::set_mode_flags(Mode mode) {
895 // Set up default values for all flags.
896 // If you add a flag to any of the branches below,
897 // add a default value for it here.
898 set_java_compiler(false);
899 _mode = mode;
901 // Ensure Agent_OnLoad has the correct initial values.
902 // This may not be the final mode; mode may change later in onload phase.
903 PropertyList_unique_add(&_system_properties, "java.vm.info",
904 (char*)Abstract_VM_Version::vm_info_string(), false);
906 UseInterpreter = true;
907 UseCompiler = true;
908 UseLoopCounter = true;
910 // Default values may be platform/compiler dependent -
911 // use the saved values
912 ClipInlining = Arguments::_ClipInlining;
913 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
914 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
915 BackgroundCompilation = Arguments::_BackgroundCompilation;
916 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
918 // Change from defaults based on mode
919 switch (mode) {
920 default:
921 ShouldNotReachHere();
922 break;
923 case _int:
924 UseCompiler = false;
925 UseLoopCounter = false;
926 AlwaysCompileLoopMethods = false;
927 UseOnStackReplacement = false;
928 break;
929 case _mixed:
930 // same as default
931 break;
932 case _comp:
933 UseInterpreter = false;
934 BackgroundCompilation = false;
935 ClipInlining = false;
936 break;
937 }
938 }
940 // Conflict: required to use shared spaces (-Xshare:on), but
941 // incompatible command line options were chosen.
943 static void no_shared_spaces() {
944 if (RequireSharedSpaces) {
945 jio_fprintf(defaultStream::error_stream(),
946 "Class data sharing is inconsistent with other specified options.\n");
947 vm_exit_during_initialization("Unable to use shared archive.", NULL);
948 } else {
949 FLAG_SET_DEFAULT(UseSharedSpaces, false);
950 }
951 }
953 #ifndef KERNEL
954 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
955 // if it's not explictly set or unset. If the user has chosen
956 // UseParNewGC and not explicitly set ParallelGCThreads we
957 // set it, unless this is a single cpu machine.
958 void Arguments::set_parnew_gc_flags() {
959 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
960 "control point invariant");
961 assert(UseParNewGC, "Error");
963 // Turn off AdaptiveSizePolicy by default for parnew until it is
964 // complete.
965 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
966 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
967 }
969 if (ParallelGCThreads == 0) {
970 FLAG_SET_DEFAULT(ParallelGCThreads,
971 Abstract_VM_Version::parallel_worker_threads());
972 if (ParallelGCThreads == 1) {
973 FLAG_SET_DEFAULT(UseParNewGC, false);
974 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
975 }
976 }
977 if (UseParNewGC) {
978 // CDS doesn't work with ParNew yet
979 no_shared_spaces();
981 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
982 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
983 // we set them to 1024 and 1024.
984 // See CR 6362902.
985 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
986 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
987 }
988 if (FLAG_IS_DEFAULT(OldPLABSize)) {
989 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
990 }
992 // AlwaysTenure flag should make ParNew promote all at first collection.
993 // See CR 6362902.
994 if (AlwaysTenure) {
995 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
996 }
997 // When using compressed oops, we use local overflow stacks,
998 // rather than using a global overflow list chained through
999 // the klass word of the object's pre-image.
1000 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1001 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1002 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1003 }
1004 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1005 }
1006 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1007 }
1008 }
1010 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1011 // sparc/solaris for certain applications, but would gain from
1012 // further optimization and tuning efforts, and would almost
1013 // certainly gain from analysis of platform and environment.
1014 void Arguments::set_cms_and_parnew_gc_flags() {
1015 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1016 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1018 // If we are using CMS, we prefer to UseParNewGC,
1019 // unless explicitly forbidden.
1020 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1021 FLAG_SET_ERGO(bool, UseParNewGC, true);
1022 }
1024 // Turn off AdaptiveSizePolicy by default for cms until it is
1025 // complete.
1026 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1027 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1028 }
1030 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1031 // as needed.
1032 if (UseParNewGC) {
1033 set_parnew_gc_flags();
1034 }
1036 // Now make adjustments for CMS
1037 size_t young_gen_per_worker;
1038 intx new_ratio;
1039 size_t min_new_default;
1040 intx tenuring_default;
1041 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1042 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1043 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1044 }
1045 young_gen_per_worker = 4*M;
1046 new_ratio = (intx)15;
1047 min_new_default = 4*M;
1048 tenuring_default = (intx)0;
1049 } else { // new defaults: "new" as of 6.0
1050 young_gen_per_worker = CMSYoungGenPerWorker;
1051 new_ratio = (intx)7;
1052 min_new_default = 16*M;
1053 tenuring_default = (intx)4;
1054 }
1056 // Preferred young gen size for "short" pauses
1057 const uintx parallel_gc_threads =
1058 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1059 const size_t preferred_max_new_size_unaligned =
1060 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1061 const size_t preferred_max_new_size =
1062 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1064 // Unless explicitly requested otherwise, size young gen
1065 // for "short" pauses ~ 4M*ParallelGCThreads
1067 // If either MaxNewSize or NewRatio is set on the command line,
1068 // assume the user is trying to set the size of the young gen.
1070 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1072 // Set MaxNewSize to our calculated preferred_max_new_size unless
1073 // NewSize was set on the command line and it is larger than
1074 // preferred_max_new_size.
1075 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1076 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1077 } else {
1078 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1079 }
1080 if (PrintGCDetails && Verbose) {
1081 // Too early to use gclog_or_tty
1082 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1083 }
1085 // Unless explicitly requested otherwise, prefer a large
1086 // Old to Young gen size so as to shift the collection load
1087 // to the old generation concurrent collector
1089 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1090 // then NewSize and OldSize may be calculated. That would
1091 // generally lead to some differences with ParNewGC for which
1092 // there was no obvious reason. Also limit to the case where
1093 // MaxNewSize has not been set.
1095 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1097 // Code along this path potentially sets NewSize and OldSize
1099 // Calculate the desired minimum size of the young gen but if
1100 // NewSize has been set on the command line, use it here since
1101 // it should be the final value.
1102 size_t min_new;
1103 if (FLAG_IS_DEFAULT(NewSize)) {
1104 min_new = align_size_up(ScaleForWordSize(min_new_default),
1105 os::vm_page_size());
1106 } else {
1107 min_new = NewSize;
1108 }
1109 size_t prev_initial_size = InitialHeapSize;
1110 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1111 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1112 // Currently minimum size and the initial heap sizes are the same.
1113 set_min_heap_size(InitialHeapSize);
1114 if (PrintGCDetails && Verbose) {
1115 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1116 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1117 InitialHeapSize/M, prev_initial_size/M);
1118 }
1119 }
1121 // MaxHeapSize is aligned down in collectorPolicy
1122 size_t max_heap =
1123 align_size_down(MaxHeapSize,
1124 CardTableRS::ct_max_alignment_constraint());
1126 if (PrintGCDetails && Verbose) {
1127 // Too early to use gclog_or_tty
1128 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1129 " initial_heap_size: " SIZE_FORMAT
1130 " max_heap: " SIZE_FORMAT,
1131 min_heap_size(), InitialHeapSize, max_heap);
1132 }
1133 if (max_heap > min_new) {
1134 // Unless explicitly requested otherwise, make young gen
1135 // at least min_new, and at most preferred_max_new_size.
1136 if (FLAG_IS_DEFAULT(NewSize)) {
1137 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1138 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1139 if (PrintGCDetails && Verbose) {
1140 // Too early to use gclog_or_tty
1141 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1142 }
1143 }
1144 // Unless explicitly requested otherwise, size old gen
1145 // so that it's at least 3X of NewSize to begin with;
1146 // later NewRatio will decide how it grows; see above.
1147 if (FLAG_IS_DEFAULT(OldSize)) {
1148 if (max_heap > NewSize) {
1149 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1150 if (PrintGCDetails && Verbose) {
1151 // Too early to use gclog_or_tty
1152 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1153 }
1154 }
1155 }
1156 }
1157 }
1158 // Unless explicitly requested otherwise, definitely
1159 // promote all objects surviving "tenuring_default" scavenges.
1160 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1161 FLAG_IS_DEFAULT(SurvivorRatio)) {
1162 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1163 }
1164 // If we decided above (or user explicitly requested)
1165 // `promote all' (via MaxTenuringThreshold := 0),
1166 // prefer minuscule survivor spaces so as not to waste
1167 // space for (non-existent) survivors
1168 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1169 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1170 }
1171 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1172 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1173 // This is done in order to make ParNew+CMS configuration to work
1174 // with YoungPLABSize and OldPLABSize options.
1175 // See CR 6362902.
1176 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1177 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1178 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1179 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1180 // the value (either from the command line or ergonomics) of
1181 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1182 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1183 } else {
1184 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1185 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1186 // we'll let it to take precedence.
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1189 " options are specified for the CMS collector."
1190 " CMSParPromoteBlocksToClaim will take precedence.\n");
1191 }
1192 }
1193 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1194 // OldPLAB sizing manually turned off: Use a larger default setting,
1195 // unless it was manually specified. This is because a too-low value
1196 // will slow down scavenges.
1197 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1198 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1199 }
1200 }
1201 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1202 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1203 // If either of the static initialization defaults have changed, note this
1204 // modification.
1205 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1206 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1207 }
1208 if (PrintGCDetails && Verbose) {
1209 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1210 MarkStackSize / K, MarkStackSizeMax / K);
1211 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1212 }
1213 }
1214 #endif // KERNEL
1216 void set_object_alignment() {
1217 // Object alignment.
1218 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1219 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1220 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1221 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1222 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1223 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1225 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1226 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1228 // Oop encoding heap max
1229 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1231 #ifndef KERNEL
1232 // Set CMS global values
1233 CompactibleFreeListSpace::set_cms_values();
1234 #endif // KERNEL
1235 }
1237 bool verify_object_alignment() {
1238 // Object alignment.
1239 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1240 jio_fprintf(defaultStream::error_stream(),
1241 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes);
1242 return false;
1243 }
1244 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1245 jio_fprintf(defaultStream::error_stream(),
1246 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong);
1247 return false;
1248 }
1249 return true;
1250 }
1252 inline uintx max_heap_for_compressed_oops() {
1253 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1254 NOT_LP64(ShouldNotReachHere(); return 0);
1255 }
1257 bool Arguments::should_auto_select_low_pause_collector() {
1258 if (UseAutoGCSelectPolicy &&
1259 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1260 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1261 if (PrintGCDetails) {
1262 // Cannot use gclog_or_tty yet.
1263 tty->print_cr("Automatic selection of the low pause collector"
1264 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1265 }
1266 return true;
1267 }
1268 return false;
1269 }
1271 void Arguments::set_ergonomics_flags() {
1272 // Parallel GC is not compatible with sharing. If one specifies
1273 // that they want sharing explicitly, do not set ergonomics flags.
1274 if (DumpSharedSpaces || ForceSharedSpaces) {
1275 return;
1276 }
1278 if (os::is_server_class_machine() && !force_client_mode ) {
1279 // If no other collector is requested explicitly,
1280 // let the VM select the collector based on
1281 // machine class and automatic selection policy.
1282 if (!UseSerialGC &&
1283 !UseConcMarkSweepGC &&
1284 !UseG1GC &&
1285 !UseParNewGC &&
1286 !DumpSharedSpaces &&
1287 FLAG_IS_DEFAULT(UseParallelGC)) {
1288 if (should_auto_select_low_pause_collector()) {
1289 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1290 } else {
1291 FLAG_SET_ERGO(bool, UseParallelGC, true);
1292 }
1293 no_shared_spaces();
1294 }
1295 }
1297 #ifndef ZERO
1298 #ifdef _LP64
1299 // Check that UseCompressedOops can be set with the max heap size allocated
1300 // by ergonomics.
1301 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1302 #ifndef COMPILER1
1303 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1304 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1305 }
1306 #endif
1307 #ifdef _WIN64
1308 if (UseLargePages && UseCompressedOops) {
1309 // Cannot allocate guard pages for implicit checks in indexed addressing
1310 // mode, when large pages are specified on windows.
1311 // This flag could be switched ON if narrow oop base address is set to 0,
1312 // see code in Universe::initialize_heap().
1313 Universe::set_narrow_oop_use_implicit_null_checks(false);
1314 }
1315 #endif // _WIN64
1316 } else {
1317 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1318 warning("Max heap size too large for Compressed Oops");
1319 FLAG_SET_DEFAULT(UseCompressedOops, false);
1320 }
1321 }
1322 // Also checks that certain machines are slower with compressed oops
1323 // in vm_version initialization code.
1324 #endif // _LP64
1325 #endif // !ZERO
1326 }
1328 void Arguments::set_parallel_gc_flags() {
1329 assert(UseParallelGC || UseParallelOldGC, "Error");
1330 // If parallel old was requested, automatically enable parallel scavenge.
1331 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1332 FLAG_SET_DEFAULT(UseParallelGC, true);
1333 }
1335 // If no heap maximum was requested explicitly, use some reasonable fraction
1336 // of the physical memory, up to a maximum of 1GB.
1337 if (UseParallelGC) {
1338 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1339 Abstract_VM_Version::parallel_worker_threads());
1341 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1342 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1343 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1344 // See CR 6362902 for details.
1345 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1346 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1347 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1348 }
1349 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1350 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1351 }
1352 }
1354 if (UseParallelOldGC) {
1355 // Par compact uses lower default values since they are treated as
1356 // minimums. These are different defaults because of the different
1357 // interpretation and are not ergonomically set.
1358 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1359 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1360 }
1361 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1362 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1363 }
1364 }
1365 }
1366 }
1368 void Arguments::set_g1_gc_flags() {
1369 assert(UseG1GC, "Error");
1370 #ifdef COMPILER1
1371 FastTLABRefill = false;
1372 #endif
1373 FLAG_SET_DEFAULT(ParallelGCThreads,
1374 Abstract_VM_Version::parallel_worker_threads());
1375 if (ParallelGCThreads == 0) {
1376 FLAG_SET_DEFAULT(ParallelGCThreads,
1377 Abstract_VM_Version::parallel_worker_threads());
1378 }
1379 no_shared_spaces();
1381 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1382 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1383 }
1384 if (PrintGCDetails && Verbose) {
1385 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1386 MarkStackSize / K, MarkStackSizeMax / K);
1387 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1388 }
1390 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1391 // In G1, we want the default GC overhead goal to be higher than
1392 // say in PS. So we set it here to 10%. Otherwise the heap might
1393 // be expanded more aggressively than we would like it to. In
1394 // fact, even 10% seems to not be high enough in some cases
1395 // (especially small GC stress tests that the main thing they do
1396 // is allocation). We might consider increase it further.
1397 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1398 }
1399 }
1401 void Arguments::set_heap_size() {
1402 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1403 // Deprecated flag
1404 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1405 }
1407 const julong phys_mem =
1408 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1409 : (julong)MaxRAM;
1411 // If the maximum heap size has not been set with -Xmx,
1412 // then set it as fraction of the size of physical memory,
1413 // respecting the maximum and minimum sizes of the heap.
1414 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1415 julong reasonable_max = phys_mem / MaxRAMFraction;
1417 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1418 // Small physical memory, so use a minimum fraction of it for the heap
1419 reasonable_max = phys_mem / MinRAMFraction;
1420 } else {
1421 // Not-small physical memory, so require a heap at least
1422 // as large as MaxHeapSize
1423 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1424 }
1425 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1426 // Limit the heap size to ErgoHeapSizeLimit
1427 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1428 }
1429 if (UseCompressedOops) {
1430 // Limit the heap size to the maximum possible when using compressed oops
1431 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1432 }
1433 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1435 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1436 // An initial heap size was specified on the command line,
1437 // so be sure that the maximum size is consistent. Done
1438 // after call to allocatable_physical_memory because that
1439 // method might reduce the allocation size.
1440 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1441 }
1443 if (PrintGCDetails && Verbose) {
1444 // Cannot use gclog_or_tty yet.
1445 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1446 }
1447 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1448 }
1450 // If the initial_heap_size has not been set with InitialHeapSize
1451 // or -Xms, then set it as fraction of the size of physical memory,
1452 // respecting the maximum and minimum sizes of the heap.
1453 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1454 julong reasonable_minimum = (julong)(OldSize + NewSize);
1456 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1458 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1460 julong reasonable_initial = phys_mem / InitialRAMFraction;
1462 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1463 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1465 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1467 if (PrintGCDetails && Verbose) {
1468 // Cannot use gclog_or_tty yet.
1469 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1470 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1471 }
1472 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1473 set_min_heap_size((uintx)reasonable_minimum);
1474 }
1475 }
1477 // This must be called after ergonomics because we want bytecode rewriting
1478 // if the server compiler is used, or if UseSharedSpaces is disabled.
1479 void Arguments::set_bytecode_flags() {
1480 // Better not attempt to store into a read-only space.
1481 if (UseSharedSpaces) {
1482 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1483 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1484 }
1486 if (!RewriteBytecodes) {
1487 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1488 }
1489 }
1491 // Aggressive optimization flags -XX:+AggressiveOpts
1492 void Arguments::set_aggressive_opts_flags() {
1493 #ifdef COMPILER2
1494 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1495 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1496 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1497 }
1498 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1499 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1500 }
1502 // Feed the cache size setting into the JDK
1503 char buffer[1024];
1504 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1505 add_property(buffer);
1506 }
1507 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1508 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1509 }
1510 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1511 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1512 }
1513 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1514 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1515 }
1516 #endif
1518 if (AggressiveOpts) {
1519 // Sample flag setting code
1520 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1521 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1522 // }
1523 }
1524 }
1526 //===========================================================================================================
1527 // Parsing of java.compiler property
1529 void Arguments::process_java_compiler_argument(char* arg) {
1530 // For backwards compatibility, Djava.compiler=NONE or ""
1531 // causes us to switch to -Xint mode UNLESS -Xdebug
1532 // is also specified.
1533 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1534 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1535 }
1536 }
1538 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1539 _sun_java_launcher = strdup(launcher);
1540 }
1542 bool Arguments::created_by_java_launcher() {
1543 assert(_sun_java_launcher != NULL, "property must have value");
1544 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1545 }
1547 //===========================================================================================================
1548 // Parsing of main arguments
1550 bool Arguments::verify_interval(uintx val, uintx min,
1551 uintx max, const char* name) {
1552 // Returns true iff value is in the inclusive interval [min..max]
1553 // false, otherwise.
1554 if (val >= min && val <= max) {
1555 return true;
1556 }
1557 jio_fprintf(defaultStream::error_stream(),
1558 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1559 " and " UINTX_FORMAT "\n",
1560 name, val, min, max);
1561 return false;
1562 }
1564 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1565 // Returns true if given value is greater than specified min threshold
1566 // false, otherwise.
1567 if (val >= min ) {
1568 return true;
1569 }
1570 jio_fprintf(defaultStream::error_stream(),
1571 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1572 name, val, min);
1573 return false;
1574 }
1576 bool Arguments::verify_percentage(uintx value, const char* name) {
1577 if (value <= 100) {
1578 return true;
1579 }
1580 jio_fprintf(defaultStream::error_stream(),
1581 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1582 name, value);
1583 return false;
1584 }
1586 static void force_serial_gc() {
1587 FLAG_SET_DEFAULT(UseSerialGC, true);
1588 FLAG_SET_DEFAULT(UseParNewGC, false);
1589 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1590 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1591 FLAG_SET_DEFAULT(UseParallelGC, false);
1592 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1593 FLAG_SET_DEFAULT(UseG1GC, false);
1594 }
1596 static bool verify_serial_gc_flags() {
1597 return (UseSerialGC &&
1598 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1599 UseParallelGC || UseParallelOldGC));
1600 }
1602 // Check consistency of GC selection
1603 bool Arguments::check_gc_consistency() {
1604 bool status = true;
1605 // Ensure that the user has not selected conflicting sets
1606 // of collectors. [Note: this check is merely a user convenience;
1607 // collectors over-ride each other so that only a non-conflicting
1608 // set is selected; however what the user gets is not what they
1609 // may have expected from the combination they asked for. It's
1610 // better to reduce user confusion by not allowing them to
1611 // select conflicting combinations.
1612 uint i = 0;
1613 if (UseSerialGC) i++;
1614 if (UseConcMarkSweepGC || UseParNewGC) i++;
1615 if (UseParallelGC || UseParallelOldGC) i++;
1616 if (UseG1GC) i++;
1617 if (i > 1) {
1618 jio_fprintf(defaultStream::error_stream(),
1619 "Conflicting collector combinations in option list; "
1620 "please refer to the release notes for the combinations "
1621 "allowed\n");
1622 status = false;
1623 }
1625 return status;
1626 }
1628 // Check stack pages settings
1629 bool Arguments::check_stack_pages()
1630 {
1631 bool status = true;
1632 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1633 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1634 status = status && verify_min_value(StackShadowPages, 1, "StackShadowPages");
1635 return status;
1636 }
1638 // Check the consistency of vm_init_args
1639 bool Arguments::check_vm_args_consistency() {
1640 // Method for adding checks for flag consistency.
1641 // The intent is to warn the user of all possible conflicts,
1642 // before returning an error.
1643 // Note: Needs platform-dependent factoring.
1644 bool status = true;
1646 #if ( (defined(COMPILER2) && defined(SPARC)))
1647 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1648 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1649 // x86. Normally, VM_Version_init must be called from init_globals in
1650 // init.cpp, which is called by the initial java thread *after* arguments
1651 // have been parsed. VM_Version_init gets called twice on sparc.
1652 extern void VM_Version_init();
1653 VM_Version_init();
1654 if (!VM_Version::has_v9()) {
1655 jio_fprintf(defaultStream::error_stream(),
1656 "V8 Machine detected, Server requires V9\n");
1657 status = false;
1658 }
1659 #endif /* COMPILER2 && SPARC */
1661 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1662 // builds so the cost of stack banging can be measured.
1663 #if (defined(PRODUCT) && defined(SOLARIS))
1664 if (!UseBoundThreads && !UseStackBanging) {
1665 jio_fprintf(defaultStream::error_stream(),
1666 "-UseStackBanging conflicts with -UseBoundThreads\n");
1668 status = false;
1669 }
1670 #endif
1672 if (TLABRefillWasteFraction == 0) {
1673 jio_fprintf(defaultStream::error_stream(),
1674 "TLABRefillWasteFraction should be a denominator, "
1675 "not " SIZE_FORMAT "\n",
1676 TLABRefillWasteFraction);
1677 status = false;
1678 }
1680 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1681 "MaxLiveObjectEvacuationRatio");
1682 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1683 "AdaptiveSizePolicyWeight");
1684 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1685 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1686 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1687 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1689 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1690 jio_fprintf(defaultStream::error_stream(),
1691 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1692 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1693 MinHeapFreeRatio, MaxHeapFreeRatio);
1694 status = false;
1695 }
1696 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1697 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1699 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1700 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1701 }
1703 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1704 // Settings to encourage splitting.
1705 if (!FLAG_IS_CMDLINE(NewRatio)) {
1706 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1707 }
1708 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1709 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1710 }
1711 }
1713 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1714 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1715 if (GCTimeLimit == 100) {
1716 // Turn off gc-overhead-limit-exceeded checks
1717 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1718 }
1720 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1722 // Check whether user-specified sharing option conflicts with GC or page size.
1723 // Both sharing and large pages are enabled by default on some platforms;
1724 // large pages override sharing only if explicitly set on the command line.
1725 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1726 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1727 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1728 if (cannot_share) {
1729 // Either force sharing on by forcing the other options off, or
1730 // force sharing off.
1731 if (DumpSharedSpaces || ForceSharedSpaces) {
1732 jio_fprintf(defaultStream::error_stream(),
1733 "Using Serial GC and default page size because of %s\n",
1734 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1735 force_serial_gc();
1736 FLAG_SET_DEFAULT(UseLargePages, false);
1737 } else {
1738 if (UseSharedSpaces && Verbose) {
1739 jio_fprintf(defaultStream::error_stream(),
1740 "Turning off use of shared archive because of "
1741 "choice of garbage collector or large pages\n");
1742 }
1743 no_shared_spaces();
1744 }
1745 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1746 FLAG_SET_DEFAULT(UseLargePages, false);
1747 }
1749 status = status && check_gc_consistency();
1750 status = status && check_stack_pages();
1752 if (_has_alloc_profile) {
1753 if (UseParallelGC || UseParallelOldGC) {
1754 jio_fprintf(defaultStream::error_stream(),
1755 "error: invalid argument combination.\n"
1756 "Allocation profiling (-Xaprof) cannot be used together with "
1757 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1758 status = false;
1759 }
1760 if (UseConcMarkSweepGC) {
1761 jio_fprintf(defaultStream::error_stream(),
1762 "error: invalid argument combination.\n"
1763 "Allocation profiling (-Xaprof) cannot be used together with "
1764 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1765 status = false;
1766 }
1767 }
1769 if (CMSIncrementalMode) {
1770 if (!UseConcMarkSweepGC) {
1771 jio_fprintf(defaultStream::error_stream(),
1772 "error: invalid argument combination.\n"
1773 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1774 "selected in order\nto use CMSIncrementalMode.\n");
1775 status = false;
1776 } else {
1777 status = status && verify_percentage(CMSIncrementalDutyCycle,
1778 "CMSIncrementalDutyCycle");
1779 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1780 "CMSIncrementalDutyCycleMin");
1781 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1782 "CMSIncrementalSafetyFactor");
1783 status = status && verify_percentage(CMSIncrementalOffset,
1784 "CMSIncrementalOffset");
1785 status = status && verify_percentage(CMSExpAvgFactor,
1786 "CMSExpAvgFactor");
1787 // If it was not set on the command line, set
1788 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1789 if (CMSInitiatingOccupancyFraction < 0) {
1790 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1791 }
1792 }
1793 }
1795 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1796 // insists that we hold the requisite locks so that the iteration is
1797 // MT-safe. For the verification at start-up and shut-down, we don't
1798 // yet have a good way of acquiring and releasing these locks,
1799 // which are not visible at the CollectedHeap level. We want to
1800 // be able to acquire these locks and then do the iteration rather
1801 // than just disable the lock verification. This will be fixed under
1802 // bug 4788986.
1803 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1804 if (VerifyGCStartAt == 0) {
1805 warning("Heap verification at start-up disabled "
1806 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1807 VerifyGCStartAt = 1; // Disable verification at start-up
1808 }
1809 if (VerifyBeforeExit) {
1810 warning("Heap verification at shutdown disabled "
1811 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1812 VerifyBeforeExit = false; // Disable verification at shutdown
1813 }
1814 }
1816 // Note: only executed in non-PRODUCT mode
1817 if (!UseAsyncConcMarkSweepGC &&
1818 (ExplicitGCInvokesConcurrent ||
1819 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1820 jio_fprintf(defaultStream::error_stream(),
1821 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1822 " with -UseAsyncConcMarkSweepGC");
1823 status = false;
1824 }
1826 if (UseG1GC) {
1827 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1828 "InitiatingHeapOccupancyPercent");
1829 }
1831 status = status && verify_interval(RefDiscoveryPolicy,
1832 ReferenceProcessor::DiscoveryPolicyMin,
1833 ReferenceProcessor::DiscoveryPolicyMax,
1834 "RefDiscoveryPolicy");
1836 // Limit the lower bound of this flag to 1 as it is used in a division
1837 // expression.
1838 status = status && verify_interval(TLABWasteTargetPercent,
1839 1, 100, "TLABWasteTargetPercent");
1841 status = status && verify_object_alignment();
1843 return status;
1844 }
1846 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1847 const char* option_type) {
1848 if (ignore) return false;
1850 const char* spacer = " ";
1851 if (option_type == NULL) {
1852 option_type = ++spacer; // Set both to the empty string.
1853 }
1855 if (os::obsolete_option(option)) {
1856 jio_fprintf(defaultStream::error_stream(),
1857 "Obsolete %s%soption: %s\n", option_type, spacer,
1858 option->optionString);
1859 return false;
1860 } else {
1861 jio_fprintf(defaultStream::error_stream(),
1862 "Unrecognized %s%soption: %s\n", option_type, spacer,
1863 option->optionString);
1864 return true;
1865 }
1866 }
1868 static const char* user_assertion_options[] = {
1869 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1870 };
1872 static const char* system_assertion_options[] = {
1873 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1874 };
1876 // Return true if any of the strings in null-terminated array 'names' matches.
1877 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1878 // the option must match exactly.
1879 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1880 bool tail_allowed) {
1881 for (/* empty */; *names != NULL; ++names) {
1882 if (match_option(option, *names, tail)) {
1883 if (**tail == '\0' || tail_allowed && **tail == ':') {
1884 return true;
1885 }
1886 }
1887 }
1888 return false;
1889 }
1891 bool Arguments::parse_uintx(const char* value,
1892 uintx* uintx_arg,
1893 uintx min_size) {
1895 // Check the sign first since atomull() parses only unsigned values.
1896 bool value_is_positive = !(*value == '-');
1898 if (value_is_positive) {
1899 julong n;
1900 bool good_return = atomull(value, &n);
1901 if (good_return) {
1902 bool above_minimum = n >= min_size;
1903 bool value_is_too_large = n > max_uintx;
1905 if (above_minimum && !value_is_too_large) {
1906 *uintx_arg = n;
1907 return true;
1908 }
1909 }
1910 }
1911 return false;
1912 }
1914 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1915 julong* long_arg,
1916 julong min_size) {
1917 if (!atomull(s, long_arg)) return arg_unreadable;
1918 return check_memory_size(*long_arg, min_size);
1919 }
1921 // Parse JavaVMInitArgs structure
1923 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1924 // For components of the system classpath.
1925 SysClassPath scp(Arguments::get_sysclasspath());
1926 bool scp_assembly_required = false;
1928 // Save default settings for some mode flags
1929 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1930 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1931 Arguments::_ClipInlining = ClipInlining;
1932 Arguments::_BackgroundCompilation = BackgroundCompilation;
1933 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1935 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1936 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1937 if (result != JNI_OK) {
1938 return result;
1939 }
1941 // Parse JavaVMInitArgs structure passed in
1942 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1943 if (result != JNI_OK) {
1944 return result;
1945 }
1947 if (AggressiveOpts) {
1948 // Insert alt-rt.jar between user-specified bootclasspath
1949 // prefix and the default bootclasspath. os::set_boot_path()
1950 // uses meta_index_dir as the default bootclasspath directory.
1951 const char* altclasses_jar = "alt-rt.jar";
1952 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1953 strlen(altclasses_jar);
1954 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1955 strcpy(altclasses_path, get_meta_index_dir());
1956 strcat(altclasses_path, altclasses_jar);
1957 scp.add_suffix_to_prefix(altclasses_path);
1958 scp_assembly_required = true;
1959 FREE_C_HEAP_ARRAY(char, altclasses_path);
1960 }
1962 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1963 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1964 if (result != JNI_OK) {
1965 return result;
1966 }
1968 // Do final processing now that all arguments have been parsed
1969 result = finalize_vm_init_args(&scp, scp_assembly_required);
1970 if (result != JNI_OK) {
1971 return result;
1972 }
1974 return JNI_OK;
1975 }
1977 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1978 SysClassPath* scp_p,
1979 bool* scp_assembly_required_p,
1980 FlagValueOrigin origin) {
1981 // Remaining part of option string
1982 const char* tail;
1984 // iterate over arguments
1985 for (int index = 0; index < args->nOptions; index++) {
1986 bool is_absolute_path = false; // for -agentpath vs -agentlib
1988 const JavaVMOption* option = args->options + index;
1990 if (!match_option(option, "-Djava.class.path", &tail) &&
1991 !match_option(option, "-Dsun.java.command", &tail) &&
1992 !match_option(option, "-Dsun.java.launcher", &tail)) {
1994 // add all jvm options to the jvm_args string. This string
1995 // is used later to set the java.vm.args PerfData string constant.
1996 // the -Djava.class.path and the -Dsun.java.command options are
1997 // omitted from jvm_args string as each have their own PerfData
1998 // string constant object.
1999 build_jvm_args(option->optionString);
2000 }
2002 // -verbose:[class/gc/jni]
2003 if (match_option(option, "-verbose", &tail)) {
2004 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2005 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2006 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2007 } else if (!strcmp(tail, ":gc")) {
2008 FLAG_SET_CMDLINE(bool, PrintGC, true);
2009 } else if (!strcmp(tail, ":jni")) {
2010 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2011 }
2012 // -da / -ea / -disableassertions / -enableassertions
2013 // These accept an optional class/package name separated by a colon, e.g.,
2014 // -da:java.lang.Thread.
2015 } else if (match_option(option, user_assertion_options, &tail, true)) {
2016 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2017 if (*tail == '\0') {
2018 JavaAssertions::setUserClassDefault(enable);
2019 } else {
2020 assert(*tail == ':', "bogus match by match_option()");
2021 JavaAssertions::addOption(tail + 1, enable);
2022 }
2023 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2024 } else if (match_option(option, system_assertion_options, &tail, false)) {
2025 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2026 JavaAssertions::setSystemClassDefault(enable);
2027 // -bootclasspath:
2028 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2029 scp_p->reset_path(tail);
2030 *scp_assembly_required_p = true;
2031 // -bootclasspath/a:
2032 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2033 scp_p->add_suffix(tail);
2034 *scp_assembly_required_p = true;
2035 // -bootclasspath/p:
2036 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2037 scp_p->add_prefix(tail);
2038 *scp_assembly_required_p = true;
2039 // -Xrun
2040 } else if (match_option(option, "-Xrun", &tail)) {
2041 if (tail != NULL) {
2042 const char* pos = strchr(tail, ':');
2043 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2044 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2045 name[len] = '\0';
2047 char *options = NULL;
2048 if(pos != NULL) {
2049 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2050 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2051 }
2052 #ifdef JVMTI_KERNEL
2053 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2054 warning("profiling and debugging agents are not supported with Kernel VM");
2055 } else
2056 #endif // JVMTI_KERNEL
2057 add_init_library(name, options);
2058 }
2059 // -agentlib and -agentpath
2060 } else if (match_option(option, "-agentlib:", &tail) ||
2061 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2062 if(tail != NULL) {
2063 const char* pos = strchr(tail, '=');
2064 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2065 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2066 name[len] = '\0';
2068 char *options = NULL;
2069 if(pos != NULL) {
2070 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2071 }
2072 #ifdef JVMTI_KERNEL
2073 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2074 warning("profiling and debugging agents are not supported with Kernel VM");
2075 } else
2076 #endif // JVMTI_KERNEL
2077 add_init_agent(name, options, is_absolute_path);
2079 }
2080 // -javaagent
2081 } else if (match_option(option, "-javaagent:", &tail)) {
2082 if(tail != NULL) {
2083 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2084 add_init_agent("instrument", options, false);
2085 }
2086 // -Xnoclassgc
2087 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2088 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2089 // -Xincgc: i-CMS
2090 } else if (match_option(option, "-Xincgc", &tail)) {
2091 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2092 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2093 // -Xnoincgc: no i-CMS
2094 } else if (match_option(option, "-Xnoincgc", &tail)) {
2095 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2096 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2097 // -Xconcgc
2098 } else if (match_option(option, "-Xconcgc", &tail)) {
2099 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2100 // -Xnoconcgc
2101 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2102 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2103 // -Xbatch
2104 } else if (match_option(option, "-Xbatch", &tail)) {
2105 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2106 // -Xmn for compatibility with other JVM vendors
2107 } else if (match_option(option, "-Xmn", &tail)) {
2108 julong long_initial_eden_size = 0;
2109 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2110 if (errcode != arg_in_range) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Invalid initial eden size: %s\n", option->optionString);
2113 describe_range_error(errcode);
2114 return JNI_EINVAL;
2115 }
2116 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2117 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2118 // -Xms
2119 } else if (match_option(option, "-Xms", &tail)) {
2120 julong long_initial_heap_size = 0;
2121 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2122 if (errcode != arg_in_range) {
2123 jio_fprintf(defaultStream::error_stream(),
2124 "Invalid initial heap size: %s\n", option->optionString);
2125 describe_range_error(errcode);
2126 return JNI_EINVAL;
2127 }
2128 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2129 // Currently the minimum size and the initial heap sizes are the same.
2130 set_min_heap_size(InitialHeapSize);
2131 // -Xmx
2132 } else if (match_option(option, "-Xmx", &tail)) {
2133 julong long_max_heap_size = 0;
2134 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2135 if (errcode != arg_in_range) {
2136 jio_fprintf(defaultStream::error_stream(),
2137 "Invalid maximum heap size: %s\n", option->optionString);
2138 describe_range_error(errcode);
2139 return JNI_EINVAL;
2140 }
2141 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2142 // Xmaxf
2143 } else if (match_option(option, "-Xmaxf", &tail)) {
2144 int maxf = (int)(atof(tail) * 100);
2145 if (maxf < 0 || maxf > 100) {
2146 jio_fprintf(defaultStream::error_stream(),
2147 "Bad max heap free percentage size: %s\n",
2148 option->optionString);
2149 return JNI_EINVAL;
2150 } else {
2151 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2152 }
2153 // Xminf
2154 } else if (match_option(option, "-Xminf", &tail)) {
2155 int minf = (int)(atof(tail) * 100);
2156 if (minf < 0 || minf > 100) {
2157 jio_fprintf(defaultStream::error_stream(),
2158 "Bad min heap free percentage size: %s\n",
2159 option->optionString);
2160 return JNI_EINVAL;
2161 } else {
2162 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2163 }
2164 // -Xss
2165 } else if (match_option(option, "-Xss", &tail)) {
2166 julong long_ThreadStackSize = 0;
2167 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2168 if (errcode != arg_in_range) {
2169 jio_fprintf(defaultStream::error_stream(),
2170 "Invalid thread stack size: %s\n", option->optionString);
2171 describe_range_error(errcode);
2172 return JNI_EINVAL;
2173 }
2174 // Internally track ThreadStackSize in units of 1024 bytes.
2175 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2176 round_to((int)long_ThreadStackSize, K) / K);
2177 // -Xoss
2178 } else if (match_option(option, "-Xoss", &tail)) {
2179 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2180 // -Xmaxjitcodesize
2181 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2182 julong long_ReservedCodeCacheSize = 0;
2183 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2184 (size_t)InitialCodeCacheSize);
2185 if (errcode != arg_in_range) {
2186 jio_fprintf(defaultStream::error_stream(),
2187 "Invalid maximum code cache size: %s\n",
2188 option->optionString);
2189 describe_range_error(errcode);
2190 return JNI_EINVAL;
2191 }
2192 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2193 // -green
2194 } else if (match_option(option, "-green", &tail)) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "Green threads support not available\n");
2197 return JNI_EINVAL;
2198 // -native
2199 } else if (match_option(option, "-native", &tail)) {
2200 // HotSpot always uses native threads, ignore silently for compatibility
2201 // -Xsqnopause
2202 } else if (match_option(option, "-Xsqnopause", &tail)) {
2203 // EVM option, ignore silently for compatibility
2204 // -Xrs
2205 } else if (match_option(option, "-Xrs", &tail)) {
2206 // Classic/EVM option, new functionality
2207 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2208 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2209 // change default internal VM signals used - lower case for back compat
2210 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2211 // -Xoptimize
2212 } else if (match_option(option, "-Xoptimize", &tail)) {
2213 // EVM option, ignore silently for compatibility
2214 // -Xprof
2215 } else if (match_option(option, "-Xprof", &tail)) {
2216 #ifndef FPROF_KERNEL
2217 _has_profile = true;
2218 #else // FPROF_KERNEL
2219 // do we have to exit?
2220 warning("Kernel VM does not support flat profiling.");
2221 #endif // FPROF_KERNEL
2222 // -Xaprof
2223 } else if (match_option(option, "-Xaprof", &tail)) {
2224 _has_alloc_profile = true;
2225 // -Xconcurrentio
2226 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2227 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2228 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2229 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2230 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2231 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2233 // -Xinternalversion
2234 } else if (match_option(option, "-Xinternalversion", &tail)) {
2235 jio_fprintf(defaultStream::output_stream(), "%s\n",
2236 VM_Version::internal_vm_info_string());
2237 vm_exit(0);
2238 #ifndef PRODUCT
2239 // -Xprintflags
2240 } else if (match_option(option, "-Xprintflags", &tail)) {
2241 CommandLineFlags::printFlags();
2242 vm_exit(0);
2243 #endif
2244 // -D
2245 } else if (match_option(option, "-D", &tail)) {
2246 if (!add_property(tail)) {
2247 return JNI_ENOMEM;
2248 }
2249 // Out of the box management support
2250 if (match_option(option, "-Dcom.sun.management", &tail)) {
2251 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2252 }
2253 // -Xint
2254 } else if (match_option(option, "-Xint", &tail)) {
2255 set_mode_flags(_int);
2256 // -Xmixed
2257 } else if (match_option(option, "-Xmixed", &tail)) {
2258 set_mode_flags(_mixed);
2259 // -Xcomp
2260 } else if (match_option(option, "-Xcomp", &tail)) {
2261 // for testing the compiler; turn off all flags that inhibit compilation
2262 set_mode_flags(_comp);
2264 // -Xshare:dump
2265 } else if (match_option(option, "-Xshare:dump", &tail)) {
2266 #ifdef TIERED
2267 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2268 set_mode_flags(_int); // Prevent compilation, which creates objects
2269 #elif defined(COMPILER2)
2270 vm_exit_during_initialization(
2271 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2272 #elif defined(KERNEL)
2273 vm_exit_during_initialization(
2274 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2275 #else
2276 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2277 set_mode_flags(_int); // Prevent compilation, which creates objects
2278 #endif
2279 // -Xshare:on
2280 } else if (match_option(option, "-Xshare:on", &tail)) {
2281 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2282 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2283 #ifdef TIERED
2284 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2285 #endif // TIERED
2286 // -Xshare:auto
2287 } else if (match_option(option, "-Xshare:auto", &tail)) {
2288 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2289 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2290 // -Xshare:off
2291 } else if (match_option(option, "-Xshare:off", &tail)) {
2292 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2293 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2295 // -Xverify
2296 } else if (match_option(option, "-Xverify", &tail)) {
2297 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2298 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2299 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2300 } else if (strcmp(tail, ":remote") == 0) {
2301 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2302 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2303 } else if (strcmp(tail, ":none") == 0) {
2304 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2305 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2306 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2307 return JNI_EINVAL;
2308 }
2309 // -Xdebug
2310 } else if (match_option(option, "-Xdebug", &tail)) {
2311 // note this flag has been used, then ignore
2312 set_xdebug_mode(true);
2313 // -Xnoagent
2314 } else if (match_option(option, "-Xnoagent", &tail)) {
2315 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2316 } else if (match_option(option, "-Xboundthreads", &tail)) {
2317 // Bind user level threads to kernel threads (Solaris only)
2318 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2319 } else if (match_option(option, "-Xloggc:", &tail)) {
2320 // Redirect GC output to the file. -Xloggc:<filename>
2321 // ostream_init_log(), when called will use this filename
2322 // to initialize a fileStream.
2323 _gc_log_filename = strdup(tail);
2324 FLAG_SET_CMDLINE(bool, PrintGC, true);
2325 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2326 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2328 // JNI hooks
2329 } else if (match_option(option, "-Xcheck", &tail)) {
2330 if (!strcmp(tail, ":jni")) {
2331 CheckJNICalls = true;
2332 } else if (is_bad_option(option, args->ignoreUnrecognized,
2333 "check")) {
2334 return JNI_EINVAL;
2335 }
2336 } else if (match_option(option, "vfprintf", &tail)) {
2337 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2338 } else if (match_option(option, "exit", &tail)) {
2339 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2340 } else if (match_option(option, "abort", &tail)) {
2341 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2342 // -XX:+AggressiveHeap
2343 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2345 // This option inspects the machine and attempts to set various
2346 // parameters to be optimal for long-running, memory allocation
2347 // intensive jobs. It is intended for machines with large
2348 // amounts of cpu and memory.
2350 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2351 // VM, but we may not be able to represent the total physical memory
2352 // available (like having 8gb of memory on a box but using a 32bit VM).
2353 // Thus, we need to make sure we're using a julong for intermediate
2354 // calculations.
2355 julong initHeapSize;
2356 julong total_memory = os::physical_memory();
2358 if (total_memory < (julong)256*M) {
2359 jio_fprintf(defaultStream::error_stream(),
2360 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2361 vm_exit(1);
2362 }
2364 // The heap size is half of available memory, or (at most)
2365 // all of possible memory less 160mb (leaving room for the OS
2366 // when using ISM). This is the maximum; because adaptive sizing
2367 // is turned on below, the actual space used may be smaller.
2369 initHeapSize = MIN2(total_memory / (julong)2,
2370 total_memory - (julong)160*M);
2372 // Make sure that if we have a lot of memory we cap the 32 bit
2373 // process space. The 64bit VM version of this function is a nop.
2374 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2376 // The perm gen is separate but contiguous with the
2377 // object heap (and is reserved with it) so subtract it
2378 // from the heap size.
2379 if (initHeapSize > MaxPermSize) {
2380 initHeapSize = initHeapSize - MaxPermSize;
2381 } else {
2382 warning("AggressiveHeap and MaxPermSize values may conflict");
2383 }
2385 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2386 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2387 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2388 // Currently the minimum size and the initial heap sizes are the same.
2389 set_min_heap_size(initHeapSize);
2390 }
2391 if (FLAG_IS_DEFAULT(NewSize)) {
2392 // Make the young generation 3/8ths of the total heap.
2393 FLAG_SET_CMDLINE(uintx, NewSize,
2394 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2395 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2396 }
2398 FLAG_SET_DEFAULT(UseLargePages, true);
2400 // Increase some data structure sizes for efficiency
2401 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2402 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2403 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2405 // See the OldPLABSize comment below, but replace 'after promotion'
2406 // with 'after copying'. YoungPLABSize is the size of the survivor
2407 // space per-gc-thread buffers. The default is 4kw.
2408 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2410 // OldPLABSize is the size of the buffers in the old gen that
2411 // UseParallelGC uses to promote live data that doesn't fit in the
2412 // survivor spaces. At any given time, there's one for each gc thread.
2413 // The default size is 1kw. These buffers are rarely used, since the
2414 // survivor spaces are usually big enough. For specjbb, however, there
2415 // are occasions when there's lots of live data in the young gen
2416 // and we end up promoting some of it. We don't have a definite
2417 // explanation for why bumping OldPLABSize helps, but the theory
2418 // is that a bigger PLAB results in retaining something like the
2419 // original allocation order after promotion, which improves mutator
2420 // locality. A minor effect may be that larger PLABs reduce the
2421 // number of PLAB allocation events during gc. The value of 8kw
2422 // was arrived at by experimenting with specjbb.
2423 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2425 // CompilationPolicyChoice=0 causes the server compiler to adopt
2426 // a more conservative which-method-do-I-compile policy when one
2427 // of the counters maintained by the interpreter trips. The
2428 // result is reduced startup time and improved specjbb and
2429 // alacrity performance. Zero is the default, but we set it
2430 // explicitly here in case the default changes.
2431 // See runtime/compilationPolicy.*.
2432 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2434 // Enable parallel GC and adaptive generation sizing
2435 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2436 FLAG_SET_DEFAULT(ParallelGCThreads,
2437 Abstract_VM_Version::parallel_worker_threads());
2439 // Encourage steady state memory management
2440 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2442 // This appears to improve mutator locality
2443 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2445 // Get around early Solaris scheduling bug
2446 // (affinity vs other jobs on system)
2447 // but disallow DR and offlining (5008695).
2448 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2450 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2451 // The last option must always win.
2452 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2453 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2454 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2455 // The last option must always win.
2456 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2457 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2458 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2459 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Please use CMSClassUnloadingEnabled in place of "
2462 "CMSPermGenSweepingEnabled in the future\n");
2463 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2464 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Please use -XX:+UseGCOverheadLimit in place of "
2467 "-XX:+UseGCTimeLimit in the future\n");
2468 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2469 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Please use -XX:-UseGCOverheadLimit in place of "
2472 "-XX:-UseGCTimeLimit in the future\n");
2473 // The TLE options are for compatibility with 1.3 and will be
2474 // removed without notice in a future release. These options
2475 // are not to be documented.
2476 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2477 // No longer used.
2478 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2479 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2480 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2481 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2482 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2483 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2484 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2485 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2486 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2487 // No longer used.
2488 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2489 julong long_tlab_size = 0;
2490 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2491 if (errcode != arg_in_range) {
2492 jio_fprintf(defaultStream::error_stream(),
2493 "Invalid TLAB size: %s\n", option->optionString);
2494 describe_range_error(errcode);
2495 return JNI_EINVAL;
2496 }
2497 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2498 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2499 // No longer used.
2500 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2501 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2502 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2503 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2504 SOLARIS_ONLY(
2505 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2506 warning("-XX:+UsePermISM is obsolete.");
2507 FLAG_SET_CMDLINE(bool, UseISM, true);
2508 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2509 FLAG_SET_CMDLINE(bool, UseISM, false);
2510 )
2511 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2512 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2513 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2514 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2515 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2516 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2517 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2518 #ifdef SOLARIS
2519 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2520 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2521 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2522 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2523 #else // ndef SOLARIS
2524 jio_fprintf(defaultStream::error_stream(),
2525 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2526 return JNI_EINVAL;
2527 #endif // ndef SOLARIS
2528 #ifdef ASSERT
2529 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2530 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2531 // disable scavenge before parallel mark-compact
2532 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2533 #endif
2534 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2535 julong cms_blocks_to_claim = (julong)atol(tail);
2536 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Please use -XX:OldPLABSize in place of "
2539 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2540 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2541 julong cms_blocks_to_claim = (julong)atol(tail);
2542 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Please use -XX:OldPLABSize in place of "
2545 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2546 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2547 julong old_plab_size = 0;
2548 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2549 if (errcode != arg_in_range) {
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Invalid old PLAB size: %s\n", option->optionString);
2552 describe_range_error(errcode);
2553 return JNI_EINVAL;
2554 }
2555 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Please use -XX:OldPLABSize in place of "
2558 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2559 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2560 julong young_plab_size = 0;
2561 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2562 if (errcode != arg_in_range) {
2563 jio_fprintf(defaultStream::error_stream(),
2564 "Invalid young PLAB size: %s\n", option->optionString);
2565 describe_range_error(errcode);
2566 return JNI_EINVAL;
2567 }
2568 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Please use -XX:YoungPLABSize in place of "
2571 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2572 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2573 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2574 julong stack_size = 0;
2575 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2576 if (errcode != arg_in_range) {
2577 jio_fprintf(defaultStream::error_stream(),
2578 "Invalid mark stack size: %s\n", option->optionString);
2579 describe_range_error(errcode);
2580 return JNI_EINVAL;
2581 }
2582 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2583 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2584 julong max_stack_size = 0;
2585 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2586 if (errcode != arg_in_range) {
2587 jio_fprintf(defaultStream::error_stream(),
2588 "Invalid maximum mark stack size: %s\n",
2589 option->optionString);
2590 describe_range_error(errcode);
2591 return JNI_EINVAL;
2592 }
2593 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2594 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2595 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2596 uintx conc_threads = 0;
2597 if (!parse_uintx(tail, &conc_threads, 1)) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Invalid concurrent threads: %s\n", option->optionString);
2600 return JNI_EINVAL;
2601 }
2602 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2603 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2604 // Skip -XX:Flags= since that case has already been handled
2605 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2606 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2607 return JNI_EINVAL;
2608 }
2609 }
2610 // Unknown option
2611 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2612 return JNI_ERR;
2613 }
2614 }
2615 // Change the default value for flags which have different default values
2616 // when working with older JDKs.
2617 if (JDK_Version::current().compare_major(6) <= 0 &&
2618 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2619 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2620 }
2621 #ifdef LINUX
2622 if (JDK_Version::current().compare_major(6) <= 0 &&
2623 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2624 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2625 }
2626 #endif // LINUX
2627 return JNI_OK;
2628 }
2630 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2631 // This must be done after all -D arguments have been processed.
2632 scp_p->expand_endorsed();
2634 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2635 // Assemble the bootclasspath elements into the final path.
2636 Arguments::set_sysclasspath(scp_p->combined_path());
2637 }
2639 // This must be done after all arguments have been processed.
2640 // java_compiler() true means set to "NONE" or empty.
2641 if (java_compiler() && !xdebug_mode()) {
2642 // For backwards compatibility, we switch to interpreted mode if
2643 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2644 // not specified.
2645 set_mode_flags(_int);
2646 }
2647 if (CompileThreshold == 0) {
2648 set_mode_flags(_int);
2649 }
2651 #ifdef TIERED
2652 // If we are using tiered compilation in the tiered vm then c1 will
2653 // do the profiling and we don't want to waste that time in the
2654 // interpreter.
2655 if (TieredCompilation) {
2656 ProfileInterpreter = false;
2657 } else {
2658 // Since we are running vanilla server we must adjust the compile threshold
2659 // unless the user has already adjusted it because the default threshold assumes
2660 // we will run tiered.
2662 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2663 CompileThreshold = Tier2CompileThreshold;
2664 }
2665 }
2666 #endif // TIERED
2668 #ifndef COMPILER2
2669 // Don't degrade server performance for footprint
2670 if (FLAG_IS_DEFAULT(UseLargePages) &&
2671 MaxHeapSize < LargePageHeapSizeThreshold) {
2672 // No need for large granularity pages w/small heaps.
2673 // Note that large pages are enabled/disabled for both the
2674 // Java heap and the code cache.
2675 FLAG_SET_DEFAULT(UseLargePages, false);
2676 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2677 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2678 }
2680 // Tiered compilation is undefined with C1.
2681 TieredCompilation = false;
2683 #else
2684 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2685 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2686 }
2687 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2688 if (UseG1GC) {
2689 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2690 }
2691 #endif
2693 // If we are running in a headless jre, force java.awt.headless property
2694 // to be true unless the property has already been set.
2695 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2696 if (os::is_headless_jre()) {
2697 const char* headless = Arguments::get_property("java.awt.headless");
2698 if (headless == NULL) {
2699 char envbuffer[128];
2700 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2701 if (!add_property("java.awt.headless=true")) {
2702 return JNI_ENOMEM;
2703 }
2704 } else {
2705 char buffer[256];
2706 strcpy(buffer, "java.awt.headless=");
2707 strcat(buffer, envbuffer);
2708 if (!add_property(buffer)) {
2709 return JNI_ENOMEM;
2710 }
2711 }
2712 }
2713 }
2715 if (!check_vm_args_consistency()) {
2716 return JNI_ERR;
2717 }
2719 return JNI_OK;
2720 }
2722 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2723 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2724 scp_assembly_required_p);
2725 }
2727 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2728 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2729 scp_assembly_required_p);
2730 }
2732 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2733 const int N_MAX_OPTIONS = 64;
2734 const int OPTION_BUFFER_SIZE = 1024;
2735 char buffer[OPTION_BUFFER_SIZE];
2737 // The variable will be ignored if it exceeds the length of the buffer.
2738 // Don't check this variable if user has special privileges
2739 // (e.g. unix su command).
2740 if (os::getenv(name, buffer, sizeof(buffer)) &&
2741 !os::have_special_privileges()) {
2742 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Picked up %s: %s\n", name, buffer);
2745 char* rd = buffer; // pointer to the input string (rd)
2746 int i;
2747 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2748 while (isspace(*rd)) rd++; // skip whitespace
2749 if (*rd == 0) break; // we re done when the input string is read completely
2751 // The output, option string, overwrites the input string.
2752 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2753 // input string (rd).
2754 char* wrt = rd;
2756 options[i++].optionString = wrt; // Fill in option
2757 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2758 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2759 int quote = *rd; // matching quote to look for
2760 rd++; // don't copy open quote
2761 while (*rd != quote) { // include everything (even spaces) up until quote
2762 if (*rd == 0) { // string termination means unmatched string
2763 jio_fprintf(defaultStream::error_stream(),
2764 "Unmatched quote in %s\n", name);
2765 return JNI_ERR;
2766 }
2767 *wrt++ = *rd++; // copy to option string
2768 }
2769 rd++; // don't copy close quote
2770 } else {
2771 *wrt++ = *rd++; // copy to option string
2772 }
2773 }
2774 // Need to check if we're done before writing a NULL,
2775 // because the write could be to the byte that rd is pointing to.
2776 if (*rd++ == 0) {
2777 *wrt = 0;
2778 break;
2779 }
2780 *wrt = 0; // Zero terminate option
2781 }
2782 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2783 JavaVMInitArgs vm_args;
2784 vm_args.version = JNI_VERSION_1_2;
2785 vm_args.options = options;
2786 vm_args.nOptions = i;
2787 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2789 if (PrintVMOptions) {
2790 const char* tail;
2791 for (int i = 0; i < vm_args.nOptions; i++) {
2792 const JavaVMOption *option = vm_args.options + i;
2793 if (match_option(option, "-XX:", &tail)) {
2794 logOption(tail);
2795 }
2796 }
2797 }
2799 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2800 }
2801 return JNI_OK;
2802 }
2804 // Parse entry point called from JNI_CreateJavaVM
2806 jint Arguments::parse(const JavaVMInitArgs* args) {
2808 // Sharing support
2809 // Construct the path to the archive
2810 char jvm_path[JVM_MAXPATHLEN];
2811 os::jvm_path(jvm_path, sizeof(jvm_path));
2812 #ifdef TIERED
2813 if (strstr(jvm_path, "client") != NULL) {
2814 force_client_mode = true;
2815 }
2816 #endif // TIERED
2817 char *end = strrchr(jvm_path, *os::file_separator());
2818 if (end != NULL) *end = '\0';
2819 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2820 strlen(os::file_separator()) + 20);
2821 if (shared_archive_path == NULL) return JNI_ENOMEM;
2822 strcpy(shared_archive_path, jvm_path);
2823 strcat(shared_archive_path, os::file_separator());
2824 strcat(shared_archive_path, "classes");
2825 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2826 strcat(shared_archive_path, ".jsa");
2827 SharedArchivePath = shared_archive_path;
2829 // Remaining part of option string
2830 const char* tail;
2832 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2833 bool settings_file_specified = false;
2834 const char* flags_file;
2835 int index;
2836 for (index = 0; index < args->nOptions; index++) {
2837 const JavaVMOption *option = args->options + index;
2838 if (match_option(option, "-XX:Flags=", &tail)) {
2839 flags_file = tail;
2840 settings_file_specified = true;
2841 }
2842 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2843 PrintVMOptions = true;
2844 }
2845 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2846 PrintVMOptions = false;
2847 }
2848 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2849 IgnoreUnrecognizedVMOptions = true;
2850 }
2851 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2852 IgnoreUnrecognizedVMOptions = false;
2853 }
2854 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2855 CommandLineFlags::printFlags();
2856 vm_exit(0);
2857 }
2858 }
2860 if (IgnoreUnrecognizedVMOptions) {
2861 // uncast const to modify the flag args->ignoreUnrecognized
2862 *(jboolean*)(&args->ignoreUnrecognized) = true;
2863 }
2865 // Parse specified settings file
2866 if (settings_file_specified) {
2867 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2868 return JNI_EINVAL;
2869 }
2870 }
2872 // Parse default .hotspotrc settings file
2873 if (!settings_file_specified) {
2874 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2875 return JNI_EINVAL;
2876 }
2877 }
2879 if (PrintVMOptions) {
2880 for (index = 0; index < args->nOptions; index++) {
2881 const JavaVMOption *option = args->options + index;
2882 if (match_option(option, "-XX:", &tail)) {
2883 logOption(tail);
2884 }
2885 }
2886 }
2888 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2889 jint result = parse_vm_init_args(args);
2890 if (result != JNI_OK) {
2891 return result;
2892 }
2894 #ifndef PRODUCT
2895 if (TraceBytecodesAt != 0) {
2896 TraceBytecodes = true;
2897 }
2898 if (CountCompiledCalls) {
2899 if (UseCounterDecay) {
2900 warning("UseCounterDecay disabled because CountCalls is set");
2901 UseCounterDecay = false;
2902 }
2903 }
2904 #endif // PRODUCT
2906 if (EnableInvokeDynamic && !EnableMethodHandles) {
2907 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2908 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2909 }
2910 EnableMethodHandles = true;
2911 }
2912 if (EnableMethodHandles && !AnonymousClasses) {
2913 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2914 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2915 }
2916 AnonymousClasses = true;
2917 }
2918 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2919 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2920 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2921 }
2922 ScavengeRootsInCode = 1;
2923 }
2924 #ifdef COMPILER2
2925 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2926 // TODO: We need to find rules for invokedynamic and EA. For now,
2927 // simply disable EA by default.
2928 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2929 DoEscapeAnalysis = false;
2930 }
2931 }
2932 #endif
2934 if (PrintGCDetails) {
2935 // Turn on -verbose:gc options as well
2936 PrintGC = true;
2937 }
2939 #if defined(_LP64) && defined(COMPILER1)
2940 UseCompressedOops = false;
2941 #endif
2943 // Set object alignment values.
2944 set_object_alignment();
2946 #ifdef SERIALGC
2947 force_serial_gc();
2948 #endif // SERIALGC
2949 #ifdef KERNEL
2950 no_shared_spaces();
2951 #endif // KERNEL
2953 // Set flags based on ergonomics.
2954 set_ergonomics_flags();
2956 #ifdef _LP64
2957 // XXX JSR 292 currently does not support compressed oops.
2958 if (EnableMethodHandles && UseCompressedOops) {
2959 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2960 UseCompressedOops = false;
2961 }
2962 }
2963 #endif // _LP64
2965 // Check the GC selections again.
2966 if (!check_gc_consistency()) {
2967 return JNI_EINVAL;
2968 }
2970 #ifndef KERNEL
2971 if (UseConcMarkSweepGC) {
2972 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
2973 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2974 // are true, we don't call set_parnew_gc_flags() as well.
2975 set_cms_and_parnew_gc_flags();
2976 } else {
2977 // Set heap size based on available physical memory
2978 set_heap_size();
2979 // Set per-collector flags
2980 if (UseParallelGC || UseParallelOldGC) {
2981 set_parallel_gc_flags();
2982 } else if (UseParNewGC) {
2983 set_parnew_gc_flags();
2984 } else if (UseG1GC) {
2985 set_g1_gc_flags();
2986 }
2987 }
2988 #endif // KERNEL
2990 #ifdef SERIALGC
2991 assert(verify_serial_gc_flags(), "SerialGC unset");
2992 #endif // SERIALGC
2994 // Set bytecode rewriting flags
2995 set_bytecode_flags();
2997 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2998 set_aggressive_opts_flags();
3000 #ifdef CC_INTERP
3001 // Clear flags not supported by the C++ interpreter
3002 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3003 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3004 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3005 #endif // CC_INTERP
3007 #ifdef COMPILER2
3008 if (!UseBiasedLocking || EmitSync != 0) {
3009 UseOptoBiasInlining = false;
3010 }
3011 #endif
3013 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3014 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3015 DebugNonSafepoints = true;
3016 }
3018 #ifndef PRODUCT
3019 if (CompileTheWorld) {
3020 // Force NmethodSweeper to sweep whole CodeCache each time.
3021 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3022 NmethodSweepFraction = 1;
3023 }
3024 }
3025 #endif
3027 if (PrintCommandLineFlags) {
3028 CommandLineFlags::printSetFlags();
3029 }
3031 // Apply CPU specific policy for the BiasedLocking
3032 if (UseBiasedLocking) {
3033 if (!VM_Version::use_biased_locking() &&
3034 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3035 UseBiasedLocking = false;
3036 }
3037 }
3039 return JNI_OK;
3040 }
3042 int Arguments::PropertyList_count(SystemProperty* pl) {
3043 int count = 0;
3044 while(pl != NULL) {
3045 count++;
3046 pl = pl->next();
3047 }
3048 return count;
3049 }
3051 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3052 assert(key != NULL, "just checking");
3053 SystemProperty* prop;
3054 for (prop = pl; prop != NULL; prop = prop->next()) {
3055 if (strcmp(key, prop->key()) == 0) return prop->value();
3056 }
3057 return NULL;
3058 }
3060 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3061 int count = 0;
3062 const char* ret_val = NULL;
3064 while(pl != NULL) {
3065 if(count >= index) {
3066 ret_val = pl->key();
3067 break;
3068 }
3069 count++;
3070 pl = pl->next();
3071 }
3073 return ret_val;
3074 }
3076 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3077 int count = 0;
3078 char* ret_val = NULL;
3080 while(pl != NULL) {
3081 if(count >= index) {
3082 ret_val = pl->value();
3083 break;
3084 }
3085 count++;
3086 pl = pl->next();
3087 }
3089 return ret_val;
3090 }
3092 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3093 SystemProperty* p = *plist;
3094 if (p == NULL) {
3095 *plist = new_p;
3096 } else {
3097 while (p->next() != NULL) {
3098 p = p->next();
3099 }
3100 p->set_next(new_p);
3101 }
3102 }
3104 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3105 if (plist == NULL)
3106 return;
3108 SystemProperty* new_p = new SystemProperty(k, v, true);
3109 PropertyList_add(plist, new_p);
3110 }
3112 // This add maintains unique property key in the list.
3113 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3114 if (plist == NULL)
3115 return;
3117 // If property key exist then update with new value.
3118 SystemProperty* prop;
3119 for (prop = *plist; prop != NULL; prop = prop->next()) {
3120 if (strcmp(k, prop->key()) == 0) {
3121 if (append) {
3122 prop->append_value(v);
3123 } else {
3124 prop->set_value(v);
3125 }
3126 return;
3127 }
3128 }
3130 PropertyList_add(plist, k, v);
3131 }
3133 #ifdef KERNEL
3134 char *Arguments::get_kernel_properties() {
3135 // Find properties starting with kernel and append them to string
3136 // We need to find out how long they are first because the URL's that they
3137 // might point to could get long.
3138 int length = 0;
3139 SystemProperty* prop;
3140 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3141 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3142 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3143 }
3144 }
3145 // Add one for null terminator.
3146 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3147 if (length != 0) {
3148 int pos = 0;
3149 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3150 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3151 jio_snprintf(&props[pos], length-pos,
3152 "-D%s=%s ", prop->key(), prop->value());
3153 pos = strlen(props);
3154 }
3155 }
3156 }
3157 // null terminate props in case of null
3158 props[length] = '\0';
3159 return props;
3160 }
3161 #endif // KERNEL
3163 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3164 // Returns true if all of the source pointed by src has been copied over to
3165 // the destination buffer pointed by buf. Otherwise, returns false.
3166 // Notes:
3167 // 1. If the length (buflen) of the destination buffer excluding the
3168 // NULL terminator character is not long enough for holding the expanded
3169 // pid characters, it also returns false instead of returning the partially
3170 // expanded one.
3171 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3172 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3173 char* buf, size_t buflen) {
3174 const char* p = src;
3175 char* b = buf;
3176 const char* src_end = &src[srclen];
3177 char* buf_end = &buf[buflen - 1];
3179 while (p < src_end && b < buf_end) {
3180 if (*p == '%') {
3181 switch (*(++p)) {
3182 case '%': // "%%" ==> "%"
3183 *b++ = *p++;
3184 break;
3185 case 'p': { // "%p" ==> current process id
3186 // buf_end points to the character before the last character so
3187 // that we could write '\0' to the end of the buffer.
3188 size_t buf_sz = buf_end - b + 1;
3189 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3191 // if jio_snprintf fails or the buffer is not long enough to hold
3192 // the expanded pid, returns false.
3193 if (ret < 0 || ret >= (int)buf_sz) {
3194 return false;
3195 } else {
3196 b += ret;
3197 assert(*b == '\0', "fail in copy_expand_pid");
3198 if (p == src_end && b == buf_end + 1) {
3199 // reach the end of the buffer.
3200 return true;
3201 }
3202 }
3203 p++;
3204 break;
3205 }
3206 default :
3207 *b++ = '%';
3208 }
3209 } else {
3210 *b++ = *p++;
3211 }
3212 }
3213 *b = '\0';
3214 return (p == src_end); // return false if not all of the source was copied
3215 }