Mon, 23 Jun 2008 14:11:12 -0700
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_initial_heap_size = 0;
41 uintx Arguments::_min_heap_size = 0;
42 Arguments::Mode Arguments::_mode = _mixed;
43 bool Arguments::_java_compiler = false;
44 bool Arguments::_xdebug_mode = false;
45 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
46 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
47 int Arguments::_sun_java_launcher_pid = -1;
49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
50 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
51 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
52 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
53 bool Arguments::_ClipInlining = ClipInlining;
54 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
56 char* Arguments::SharedArchivePath = NULL;
58 AgentLibraryList Arguments::_libraryList;
59 AgentLibraryList Arguments::_agentList;
61 abort_hook_t Arguments::_abort_hook = NULL;
62 exit_hook_t Arguments::_exit_hook = NULL;
63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
66 SystemProperty *Arguments::_java_ext_dirs = NULL;
67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
69 SystemProperty *Arguments::_java_library_path = NULL;
70 SystemProperty *Arguments::_java_home = NULL;
71 SystemProperty *Arguments::_java_class_path = NULL;
72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
74 char* Arguments::_meta_index_path = NULL;
75 char* Arguments::_meta_index_dir = NULL;
77 static bool force_client_mode = false;
79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
81 static bool match_option(const JavaVMOption *option, const char* name,
82 const char** tail) {
83 int len = (int)strlen(name);
84 if (strncmp(option->optionString, name, len) == 0) {
85 *tail = option->optionString + len;
86 return true;
87 } else {
88 return false;
89 }
90 }
92 static void logOption(const char* opt) {
93 if (PrintVMOptions) {
94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 }
96 }
98 // Process java launcher properties.
99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
100 // See if sun.java.launcher or sun.java.launcher.pid is defined.
101 // Must do this before setting up other system properties,
102 // as some of them may depend on launcher type.
103 for (int index = 0; index < args->nOptions; index++) {
104 const JavaVMOption* option = args->options + index;
105 const char* tail;
107 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
108 process_java_launcher_argument(tail, option->extraInfo);
109 continue;
110 }
111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
112 _sun_java_launcher_pid = atoi(tail);
113 continue;
114 }
115 }
116 }
118 // Initialize system properties key and value.
119 void Arguments::init_system_properties() {
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
123 "Java Virtual Machine Specification", false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
125 "Sun Microsystems Inc.", false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
131 // following are JVMTI agent writeable properties.
132 // Properties values are set to NULL and they are
133 // os specific they are initialized in os::init_system_properties_values().
134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
137 _java_library_path = new SystemProperty("java.library.path", NULL, true);
138 _java_home = new SystemProperty("java.home", NULL, true);
139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
141 _java_class_path = new SystemProperty("java.class.path", "", true);
143 // Add to System Property list.
144 PropertyList_add(&_system_properties, _java_ext_dirs);
145 PropertyList_add(&_system_properties, _java_endorsed_dirs);
146 PropertyList_add(&_system_properties, _sun_boot_library_path);
147 PropertyList_add(&_system_properties, _java_library_path);
148 PropertyList_add(&_system_properties, _java_home);
149 PropertyList_add(&_system_properties, _java_class_path);
150 PropertyList_add(&_system_properties, _sun_boot_class_path);
152 // Set OS specific system properties values
153 os::init_system_properties_values();
154 }
156 // String containing commands that will be ignored and cause a
157 // warning to be issued. These commands should be accepted
158 // for 1.6 but not 1.7. The string should be cleared at the
159 // beginning of 1.7.
160 static const char* obsolete_jvm_flags_1_5_0[] = {
161 "UseTrainGC",
162 "UseSpecialLargeObjectHandling",
163 "UseOversizedCarHandling",
164 "TraceCarAllocation",
165 "PrintTrainGCProcessingStats",
166 "LogOfCarSpaceSize",
167 "OversizedCarThreshold",
168 "MinTickInterval",
169 "DefaultTickInterval",
170 "MaxTickInterval",
171 "DelayTickAdjustment",
172 "ProcessingToTenuringRatio",
173 "MinTrainLength",
174 0};
176 bool Arguments::made_obsolete_in_1_5_0(const char *s) {
177 int i = 0;
178 while (obsolete_jvm_flags_1_5_0[i] != NULL) {
179 // <flag>=xxx form
180 // [-|+]<flag> form
181 if ((strncmp(obsolete_jvm_flags_1_5_0[i], s,
182 strlen(obsolete_jvm_flags_1_5_0[i])) == 0) ||
183 ((s[0] == '+' || s[0] == '-') &&
184 (strncmp(obsolete_jvm_flags_1_5_0[i], &s[1],
185 strlen(obsolete_jvm_flags_1_5_0[i])) == 0))) {
186 return true;
187 }
188 i++;
189 }
190 return false;
191 }
193 // Constructs the system class path (aka boot class path) from the following
194 // components, in order:
195 //
196 // prefix // from -Xbootclasspath/p:...
197 // endorsed // the expansion of -Djava.endorsed.dirs=...
198 // base // from os::get_system_properties() or -Xbootclasspath=
199 // suffix // from -Xbootclasspath/a:...
200 //
201 // java.endorsed.dirs is a list of directories; any jar or zip files in the
202 // directories are added to the sysclasspath just before the base.
203 //
204 // This could be AllStatic, but it isn't needed after argument processing is
205 // complete.
206 class SysClassPath: public StackObj {
207 public:
208 SysClassPath(const char* base);
209 ~SysClassPath();
211 inline void set_base(const char* base);
212 inline void add_prefix(const char* prefix);
213 inline void add_suffix(const char* suffix);
214 inline void reset_path(const char* base);
216 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
217 // property. Must be called after all command-line arguments have been
218 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
219 // combined_path().
220 void expand_endorsed();
222 inline const char* get_base() const { return _items[_scp_base]; }
223 inline const char* get_prefix() const { return _items[_scp_prefix]; }
224 inline const char* get_suffix() const { return _items[_scp_suffix]; }
225 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
227 // Combine all the components into a single c-heap-allocated string; caller
228 // must free the string if/when no longer needed.
229 char* combined_path();
231 private:
232 // Utility routines.
233 static char* add_to_path(const char* path, const char* str, bool prepend);
234 static char* add_jars_to_path(char* path, const char* directory);
236 inline void reset_item_at(int index);
238 // Array indices for the items that make up the sysclasspath. All except the
239 // base are allocated in the C heap and freed by this class.
240 enum {
241 _scp_prefix, // from -Xbootclasspath/p:...
242 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
243 _scp_base, // the default sysclasspath
244 _scp_suffix, // from -Xbootclasspath/a:...
245 _scp_nitems // the number of items, must be last.
246 };
248 const char* _items[_scp_nitems];
249 DEBUG_ONLY(bool _expansion_done;)
250 };
252 SysClassPath::SysClassPath(const char* base) {
253 memset(_items, 0, sizeof(_items));
254 _items[_scp_base] = base;
255 DEBUG_ONLY(_expansion_done = false;)
256 }
258 SysClassPath::~SysClassPath() {
259 // Free everything except the base.
260 for (int i = 0; i < _scp_nitems; ++i) {
261 if (i != _scp_base) reset_item_at(i);
262 }
263 DEBUG_ONLY(_expansion_done = false;)
264 }
266 inline void SysClassPath::set_base(const char* base) {
267 _items[_scp_base] = base;
268 }
270 inline void SysClassPath::add_prefix(const char* prefix) {
271 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
272 }
274 inline void SysClassPath::add_suffix(const char* suffix) {
275 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
276 }
278 inline void SysClassPath::reset_item_at(int index) {
279 assert(index < _scp_nitems && index != _scp_base, "just checking");
280 if (_items[index] != NULL) {
281 FREE_C_HEAP_ARRAY(char, _items[index]);
282 _items[index] = NULL;
283 }
284 }
286 inline void SysClassPath::reset_path(const char* base) {
287 // Clear the prefix and suffix.
288 reset_item_at(_scp_prefix);
289 reset_item_at(_scp_suffix);
290 set_base(base);
291 }
293 //------------------------------------------------------------------------------
295 void SysClassPath::expand_endorsed() {
296 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
298 const char* path = Arguments::get_property("java.endorsed.dirs");
299 if (path == NULL) {
300 path = Arguments::get_endorsed_dir();
301 assert(path != NULL, "no default for java.endorsed.dirs");
302 }
304 char* expanded_path = NULL;
305 const char separator = *os::path_separator();
306 const char* const end = path + strlen(path);
307 while (path < end) {
308 const char* tmp_end = strchr(path, separator);
309 if (tmp_end == NULL) {
310 expanded_path = add_jars_to_path(expanded_path, path);
311 path = end;
312 } else {
313 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
314 memcpy(dirpath, path, tmp_end - path);
315 dirpath[tmp_end - path] = '\0';
316 expanded_path = add_jars_to_path(expanded_path, dirpath);
317 FREE_C_HEAP_ARRAY(char, dirpath);
318 path = tmp_end + 1;
319 }
320 }
321 _items[_scp_endorsed] = expanded_path;
322 DEBUG_ONLY(_expansion_done = true;)
323 }
325 // Combine the bootclasspath elements, some of which may be null, into a single
326 // c-heap-allocated string.
327 char* SysClassPath::combined_path() {
328 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
329 assert(_expansion_done, "must call expand_endorsed() first.");
331 size_t lengths[_scp_nitems];
332 size_t total_len = 0;
334 const char separator = *os::path_separator();
336 // Get the lengths.
337 int i;
338 for (i = 0; i < _scp_nitems; ++i) {
339 if (_items[i] != NULL) {
340 lengths[i] = strlen(_items[i]);
341 // Include space for the separator char (or a NULL for the last item).
342 total_len += lengths[i] + 1;
343 }
344 }
345 assert(total_len > 0, "empty sysclasspath not allowed");
347 // Copy the _items to a single string.
348 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
349 char* cp_tmp = cp;
350 for (i = 0; i < _scp_nitems; ++i) {
351 if (_items[i] != NULL) {
352 memcpy(cp_tmp, _items[i], lengths[i]);
353 cp_tmp += lengths[i];
354 *cp_tmp++ = separator;
355 }
356 }
357 *--cp_tmp = '\0'; // Replace the extra separator.
358 return cp;
359 }
361 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
362 char*
363 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
364 char *cp;
366 assert(str != NULL, "just checking");
367 if (path == NULL) {
368 size_t len = strlen(str) + 1;
369 cp = NEW_C_HEAP_ARRAY(char, len);
370 memcpy(cp, str, len); // copy the trailing null
371 } else {
372 const char separator = *os::path_separator();
373 size_t old_len = strlen(path);
374 size_t str_len = strlen(str);
375 size_t len = old_len + str_len + 2;
377 if (prepend) {
378 cp = NEW_C_HEAP_ARRAY(char, len);
379 char* cp_tmp = cp;
380 memcpy(cp_tmp, str, str_len);
381 cp_tmp += str_len;
382 *cp_tmp = separator;
383 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
384 FREE_C_HEAP_ARRAY(char, path);
385 } else {
386 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
387 char* cp_tmp = cp + old_len;
388 *cp_tmp = separator;
389 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
390 }
391 }
392 return cp;
393 }
395 // Scan the directory and append any jar or zip files found to path.
396 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
397 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
398 DIR* dir = os::opendir(directory);
399 if (dir == NULL) return path;
401 char dir_sep[2] = { '\0', '\0' };
402 size_t directory_len = strlen(directory);
403 const char fileSep = *os::file_separator();
404 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
406 /* Scan the directory for jars/zips, appending them to path. */
407 struct dirent *entry;
408 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
409 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
410 const char* name = entry->d_name;
411 const char* ext = name + strlen(name) - 4;
412 bool isJarOrZip = ext > name &&
413 (os::file_name_strcmp(ext, ".jar") == 0 ||
414 os::file_name_strcmp(ext, ".zip") == 0);
415 if (isJarOrZip) {
416 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
417 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
418 path = add_to_path(path, jarpath, false);
419 FREE_C_HEAP_ARRAY(char, jarpath);
420 }
421 }
422 FREE_C_HEAP_ARRAY(char, dbuf);
423 os::closedir(dir);
424 return path;
425 }
427 // Parses a memory size specification string.
428 static bool atomll(const char *s, jlong* result) {
429 jlong n = 0;
430 int args_read = sscanf(s, os::jlong_format_specifier(), &n);
431 if (args_read != 1) {
432 return false;
433 }
434 while (*s != '\0' && isdigit(*s)) {
435 s++;
436 }
437 // 4705540: illegal if more characters are found after the first non-digit
438 if (strlen(s) > 1) {
439 return false;
440 }
441 switch (*s) {
442 case 'T': case 't':
443 *result = n * G * K;
444 return true;
445 case 'G': case 'g':
446 *result = n * G;
447 return true;
448 case 'M': case 'm':
449 *result = n * M;
450 return true;
451 case 'K': case 'k':
452 *result = n * K;
453 return true;
454 case '\0':
455 *result = n;
456 return true;
457 default:
458 return false;
459 }
460 }
462 Arguments::ArgsRange Arguments::check_memory_size(jlong size, jlong min_size) {
463 if (size < min_size) return arg_too_small;
464 // Check that size will fit in a size_t (only relevant on 32-bit)
465 if ((julong) size > max_uintx) return arg_too_big;
466 return arg_in_range;
467 }
469 // Describe an argument out of range error
470 void Arguments::describe_range_error(ArgsRange errcode) {
471 switch(errcode) {
472 case arg_too_big:
473 jio_fprintf(defaultStream::error_stream(),
474 "The specified size exceeds the maximum "
475 "representable size.\n");
476 break;
477 case arg_too_small:
478 case arg_unreadable:
479 case arg_in_range:
480 // do nothing for now
481 break;
482 default:
483 ShouldNotReachHere();
484 }
485 }
487 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
488 return CommandLineFlags::boolAtPut(name, &value, origin);
489 }
492 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
493 double v;
494 if (sscanf(value, "%lf", &v) != 1) {
495 return false;
496 }
498 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
499 return true;
500 }
501 return false;
502 }
505 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
506 jlong v;
507 intx intx_v;
508 bool is_neg = false;
509 // Check the sign first since atomll() parses only unsigned values.
510 if (*value == '-') {
511 if (!CommandLineFlags::intxAt(name, &intx_v)) {
512 return false;
513 }
514 value++;
515 is_neg = true;
516 }
517 if (!atomll(value, &v)) {
518 return false;
519 }
520 intx_v = (intx) v;
521 if (is_neg) {
522 intx_v = -intx_v;
523 }
524 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
525 return true;
526 }
527 uintx uintx_v = (uintx) v;
528 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
529 return true;
530 }
531 return false;
532 }
535 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
536 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
537 // Contract: CommandLineFlags always returns a pointer that needs freeing.
538 FREE_C_HEAP_ARRAY(char, value);
539 return true;
540 }
542 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
543 const char* old_value = "";
544 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
545 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
546 size_t new_len = strlen(new_value);
547 const char* value;
548 char* free_this_too = NULL;
549 if (old_len == 0) {
550 value = new_value;
551 } else if (new_len == 0) {
552 value = old_value;
553 } else {
554 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
555 // each new setting adds another LINE to the switch:
556 sprintf(buf, "%s\n%s", old_value, new_value);
557 value = buf;
558 free_this_too = buf;
559 }
560 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
561 // CommandLineFlags always returns a pointer that needs freeing.
562 FREE_C_HEAP_ARRAY(char, value);
563 if (free_this_too != NULL) {
564 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
565 FREE_C_HEAP_ARRAY(char, free_this_too);
566 }
567 return true;
568 }
571 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
573 // range of acceptable characters spelled out for portability reasons
574 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
575 #define BUFLEN 255
576 char name[BUFLEN+1];
577 char dummy;
579 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
580 return set_bool_flag(name, false, origin);
581 }
582 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
583 return set_bool_flag(name, true, origin);
584 }
586 char punct;
587 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
588 const char* value = strchr(arg, '=') + 1;
589 Flag* flag = Flag::find_flag(name, strlen(name));
590 if (flag != NULL && flag->is_ccstr()) {
591 if (flag->ccstr_accumulates()) {
592 return append_to_string_flag(name, value, origin);
593 } else {
594 if (value[0] == '\0') {
595 value = NULL;
596 }
597 return set_string_flag(name, value, origin);
598 }
599 }
600 }
602 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
603 const char* value = strchr(arg, '=') + 1;
604 // -XX:Foo:=xxx will reset the string flag to the given value.
605 if (value[0] == '\0') {
606 value = NULL;
607 }
608 return set_string_flag(name, value, origin);
609 }
611 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
612 #define SIGNED_NUMBER_RANGE "[-0123456789]"
613 #define NUMBER_RANGE "[0123456789]"
614 char value[BUFLEN + 1];
615 char value2[BUFLEN + 1];
616 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
617 // Looks like a floating-point number -- try again with more lenient format string
618 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
619 return set_fp_numeric_flag(name, value, origin);
620 }
621 }
623 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
624 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
625 return set_numeric_flag(name, value, origin);
626 }
628 return false;
629 }
632 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
633 assert(bldarray != NULL, "illegal argument");
635 if (arg == NULL) {
636 return;
637 }
639 int index = *count;
641 // expand the array and add arg to the last element
642 (*count)++;
643 if (*bldarray == NULL) {
644 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
645 } else {
646 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
647 }
648 (*bldarray)[index] = strdup(arg);
649 }
651 void Arguments::build_jvm_args(const char* arg) {
652 add_string(&_jvm_args_array, &_num_jvm_args, arg);
653 }
655 void Arguments::build_jvm_flags(const char* arg) {
656 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
657 }
659 // utility function to return a string that concatenates all
660 // strings in a given char** array
661 const char* Arguments::build_resource_string(char** args, int count) {
662 if (args == NULL || count == 0) {
663 return NULL;
664 }
665 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
666 for (int i = 1; i < count; i++) {
667 length += strlen(args[i]) + 1; // add 1 for a space
668 }
669 char* s = NEW_RESOURCE_ARRAY(char, length);
670 strcpy(s, args[0]);
671 for (int j = 1; j < count; j++) {
672 strcat(s, " ");
673 strcat(s, args[j]);
674 }
675 return (const char*) s;
676 }
678 void Arguments::print_on(outputStream* st) {
679 st->print_cr("VM Arguments:");
680 if (num_jvm_flags() > 0) {
681 st->print("jvm_flags: "); print_jvm_flags_on(st);
682 }
683 if (num_jvm_args() > 0) {
684 st->print("jvm_args: "); print_jvm_args_on(st);
685 }
686 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
687 st->print_cr("Launcher Type: %s", _sun_java_launcher);
688 }
690 void Arguments::print_jvm_flags_on(outputStream* st) {
691 if (_num_jvm_flags > 0) {
692 for (int i=0; i < _num_jvm_flags; i++) {
693 st->print("%s ", _jvm_flags_array[i]);
694 }
695 st->print_cr("");
696 }
697 }
699 void Arguments::print_jvm_args_on(outputStream* st) {
700 if (_num_jvm_args > 0) {
701 for (int i=0; i < _num_jvm_args; i++) {
702 st->print("%s ", _jvm_args_array[i]);
703 }
704 st->print_cr("");
705 }
706 }
708 bool Arguments::process_argument(const char* arg, jboolean ignore_unrecognized, FlagValueOrigin origin) {
710 if (parse_argument(arg, origin)) {
711 // do nothing
712 } else if (made_obsolete_in_1_5_0(arg)) {
713 jio_fprintf(defaultStream::error_stream(),
714 "Warning: The flag %s has been EOL'd as of 1.5.0 and will"
715 " be ignored\n", arg);
716 } else {
717 if (!ignore_unrecognized) {
718 jio_fprintf(defaultStream::error_stream(),
719 "Unrecognized VM option '%s'\n", arg);
720 // allow for commandline "commenting out" options like -XX:#+Verbose
721 if (strlen(arg) == 0 || arg[0] != '#') {
722 return false;
723 }
724 }
725 }
726 return true;
727 }
730 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
731 FILE* stream = fopen(file_name, "rb");
732 if (stream == NULL) {
733 if (should_exist) {
734 jio_fprintf(defaultStream::error_stream(),
735 "Could not open settings file %s\n", file_name);
736 return false;
737 } else {
738 return true;
739 }
740 }
742 char token[1024];
743 int pos = 0;
745 bool in_white_space = true;
746 bool in_comment = false;
747 bool in_quote = false;
748 char quote_c = 0;
749 bool result = true;
751 int c = getc(stream);
752 while(c != EOF) {
753 if (in_white_space) {
754 if (in_comment) {
755 if (c == '\n') in_comment = false;
756 } else {
757 if (c == '#') in_comment = true;
758 else if (!isspace(c)) {
759 in_white_space = false;
760 token[pos++] = c;
761 }
762 }
763 } else {
764 if (c == '\n' || (!in_quote && isspace(c))) {
765 // token ends at newline, or at unquoted whitespace
766 // this allows a way to include spaces in string-valued options
767 token[pos] = '\0';
768 logOption(token);
769 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
770 build_jvm_flags(token);
771 pos = 0;
772 in_white_space = true;
773 in_quote = false;
774 } else if (!in_quote && (c == '\'' || c == '"')) {
775 in_quote = true;
776 quote_c = c;
777 } else if (in_quote && (c == quote_c)) {
778 in_quote = false;
779 } else {
780 token[pos++] = c;
781 }
782 }
783 c = getc(stream);
784 }
785 if (pos > 0) {
786 token[pos] = '\0';
787 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
788 build_jvm_flags(token);
789 }
790 fclose(stream);
791 return result;
792 }
794 //=============================================================================================================
795 // Parsing of properties (-D)
797 const char* Arguments::get_property(const char* key) {
798 return PropertyList_get_value(system_properties(), key);
799 }
801 bool Arguments::add_property(const char* prop) {
802 const char* eq = strchr(prop, '=');
803 char* key;
804 // ns must be static--its address may be stored in a SystemProperty object.
805 const static char ns[1] = {0};
806 char* value = (char *)ns;
808 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
809 key = AllocateHeap(key_len + 1, "add_property");
810 strncpy(key, prop, key_len);
811 key[key_len] = '\0';
813 if (eq != NULL) {
814 size_t value_len = strlen(prop) - key_len - 1;
815 value = AllocateHeap(value_len + 1, "add_property");
816 strncpy(value, &prop[key_len + 1], value_len + 1);
817 }
819 if (strcmp(key, "java.compiler") == 0) {
820 process_java_compiler_argument(value);
821 FreeHeap(key);
822 if (eq != NULL) {
823 FreeHeap(value);
824 }
825 return true;
826 }
827 else if (strcmp(key, "sun.java.command") == 0) {
829 _java_command = value;
831 // don't add this property to the properties exposed to the java application
832 FreeHeap(key);
833 return true;
834 }
835 else if (strcmp(key, "sun.java.launcher.pid") == 0) {
836 // launcher.pid property is private and is processed
837 // in process_sun_java_launcher_properties();
838 // the sun.java.launcher property is passed on to the java application
839 FreeHeap(key);
840 if (eq != NULL) {
841 FreeHeap(value);
842 }
843 return true;
844 }
845 else if (strcmp(key, "java.vendor.url.bug") == 0) {
846 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
847 // its value without going through the property list or making a Java call.
848 _java_vendor_url_bug = value;
849 }
851 // Create new property and add at the end of the list
852 PropertyList_unique_add(&_system_properties, key, value);
853 return true;
854 }
856 //===========================================================================================================
857 // Setting int/mixed/comp mode flags
859 void Arguments::set_mode_flags(Mode mode) {
860 // Set up default values for all flags.
861 // If you add a flag to any of the branches below,
862 // add a default value for it here.
863 set_java_compiler(false);
864 _mode = mode;
866 // Ensure Agent_OnLoad has the correct initial values.
867 // This may not be the final mode; mode may change later in onload phase.
868 PropertyList_unique_add(&_system_properties, "java.vm.info",
869 (char*)Abstract_VM_Version::vm_info_string());
871 UseInterpreter = true;
872 UseCompiler = true;
873 UseLoopCounter = true;
875 // Default values may be platform/compiler dependent -
876 // use the saved values
877 ClipInlining = Arguments::_ClipInlining;
878 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
879 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
880 BackgroundCompilation = Arguments::_BackgroundCompilation;
881 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
883 // Change from defaults based on mode
884 switch (mode) {
885 default:
886 ShouldNotReachHere();
887 break;
888 case _int:
889 UseCompiler = false;
890 UseLoopCounter = false;
891 AlwaysCompileLoopMethods = false;
892 UseOnStackReplacement = false;
893 break;
894 case _mixed:
895 // same as default
896 break;
897 case _comp:
898 UseInterpreter = false;
899 BackgroundCompilation = false;
900 ClipInlining = false;
901 break;
902 }
903 }
906 // Conflict: required to use shared spaces (-Xshare:on), but
907 // incompatible command line options were chosen.
909 static void no_shared_spaces() {
910 if (RequireSharedSpaces) {
911 jio_fprintf(defaultStream::error_stream(),
912 "Class data sharing is inconsistent with other specified options.\n");
913 vm_exit_during_initialization("Unable to use shared archive.", NULL);
914 } else {
915 FLAG_SET_DEFAULT(UseSharedSpaces, false);
916 }
917 }
920 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
921 // if it's not explictly set or unset. If the user has chosen
922 // UseParNewGC and not explicitly set ParallelGCThreads we
923 // set it, unless this is a single cpu machine.
924 void Arguments::set_parnew_gc_flags() {
925 assert(!UseSerialGC && !UseParallelGC, "control point invariant");
927 // Turn off AdaptiveSizePolicy by default for parnew until it is
928 // complete.
929 if (UseParNewGC &&
930 FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
931 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
932 }
934 if (FLAG_IS_DEFAULT(UseParNewGC) && ParallelGCThreads > 1) {
935 FLAG_SET_DEFAULT(UseParNewGC, true);
936 } else if (UseParNewGC && ParallelGCThreads == 0) {
937 FLAG_SET_DEFAULT(ParallelGCThreads,
938 Abstract_VM_Version::parallel_worker_threads());
939 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
940 FLAG_SET_DEFAULT(UseParNewGC, false);
941 }
942 }
943 if (!UseParNewGC) {
944 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
945 } else {
946 no_shared_spaces();
948 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
949 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
950 // we set them to 1024 and 1024.
951 // See CR 6362902.
952 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
953 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
954 }
955 if (FLAG_IS_DEFAULT(OldPLABSize)) {
956 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
957 }
959 // AlwaysTenure flag should make ParNew to promote all at first collection.
960 // See CR 6362902.
961 if (AlwaysTenure) {
962 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
963 }
964 }
965 }
967 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
968 // sparc/solaris for certain applications, but would gain from
969 // further optimization and tuning efforts, and would almost
970 // certainly gain from analysis of platform and environment.
971 void Arguments::set_cms_and_parnew_gc_flags() {
972 if (UseSerialGC || UseParallelGC) {
973 return;
974 }
976 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
978 // If we are using CMS, we prefer to UseParNewGC,
979 // unless explicitly forbidden.
980 if (!UseParNewGC && FLAG_IS_DEFAULT(UseParNewGC)) {
981 FLAG_SET_ERGO(bool, UseParNewGC, true);
982 }
984 // Turn off AdaptiveSizePolicy by default for cms until it is
985 // complete.
986 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
987 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
988 }
990 // In either case, adjust ParallelGCThreads and/or UseParNewGC
991 // as needed.
992 if (UseParNewGC) {
993 set_parnew_gc_flags();
994 }
996 // Now make adjustments for CMS
997 size_t young_gen_per_worker;
998 intx new_ratio;
999 size_t min_new_default;
1000 intx tenuring_default;
1001 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1002 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1003 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1004 }
1005 young_gen_per_worker = 4*M;
1006 new_ratio = (intx)15;
1007 min_new_default = 4*M;
1008 tenuring_default = (intx)0;
1009 } else { // new defaults: "new" as of 6.0
1010 young_gen_per_worker = CMSYoungGenPerWorker;
1011 new_ratio = (intx)7;
1012 min_new_default = 16*M;
1013 tenuring_default = (intx)4;
1014 }
1016 // Preferred young gen size for "short" pauses
1017 const uintx parallel_gc_threads =
1018 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1019 const size_t preferred_max_new_size_unaligned =
1020 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1021 const size_t preferred_max_new_size =
1022 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1024 // Unless explicitly requested otherwise, size young gen
1025 // for "short" pauses ~ 4M*ParallelGCThreads
1026 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1027 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1028 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1029 } else {
1030 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1031 }
1032 if(PrintGCDetails && Verbose) {
1033 // Too early to use gclog_or_tty
1034 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1035 }
1036 }
1037 // Unless explicitly requested otherwise, prefer a large
1038 // Old to Young gen size so as to shift the collection load
1039 // to the old generation concurrent collector
1040 if (FLAG_IS_DEFAULT(NewRatio)) {
1041 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1043 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1044 size_t prev_initial_size = initial_heap_size();
1045 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1046 set_initial_heap_size(min_new+OldSize);
1047 // Currently minimum size and the initial heap sizes are the same.
1048 set_min_heap_size(initial_heap_size());
1049 if (PrintGCDetails && Verbose) {
1050 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1051 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1052 initial_heap_size()/M, prev_initial_size/M);
1053 }
1054 }
1055 // MaxHeapSize is aligned down in collectorPolicy
1056 size_t max_heap = align_size_down(MaxHeapSize,
1057 CardTableRS::ct_max_alignment_constraint());
1059 if(PrintGCDetails && Verbose) {
1060 // Too early to use gclog_or_tty
1061 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1062 " initial_heap_size: " SIZE_FORMAT
1063 " max_heap: " SIZE_FORMAT,
1064 min_heap_size(), initial_heap_size(), max_heap);
1065 }
1066 if (max_heap > min_new) {
1067 // Unless explicitly requested otherwise, make young gen
1068 // at least min_new, and at most preferred_max_new_size.
1069 if (FLAG_IS_DEFAULT(NewSize)) {
1070 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1071 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1072 if(PrintGCDetails && Verbose) {
1073 // Too early to use gclog_or_tty
1074 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1075 }
1076 }
1077 // Unless explicitly requested otherwise, size old gen
1078 // so that it's at least 3X of NewSize to begin with;
1079 // later NewRatio will decide how it grows; see above.
1080 if (FLAG_IS_DEFAULT(OldSize)) {
1081 if (max_heap > NewSize) {
1082 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1083 if(PrintGCDetails && Verbose) {
1084 // Too early to use gclog_or_tty
1085 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1086 }
1087 }
1088 }
1089 }
1090 }
1091 // Unless explicitly requested otherwise, definitely
1092 // promote all objects surviving "tenuring_default" scavenges.
1093 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1094 FLAG_IS_DEFAULT(SurvivorRatio)) {
1095 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1096 }
1097 // If we decided above (or user explicitly requested)
1098 // `promote all' (via MaxTenuringThreshold := 0),
1099 // prefer minuscule survivor spaces so as not to waste
1100 // space for (non-existent) survivors
1101 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1102 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1103 }
1104 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1105 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1106 // This is done in order to make ParNew+CMS configuration to work
1107 // with YoungPLABSize and OldPLABSize options.
1108 // See CR 6362902.
1109 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1110 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1111 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1112 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1113 // the value (either from the command line or ergonomics) of
1114 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1115 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1116 }
1117 else {
1118 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1119 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1120 // we'll let it to take precedence.
1121 jio_fprintf(defaultStream::error_stream(),
1122 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1123 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1124 }
1125 }
1126 }
1128 inline uintx max_heap_for_compressed_oops() {
1129 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1130 NOT_LP64(return DefaultMaxRAM);
1131 }
1133 bool Arguments::should_auto_select_low_pause_collector() {
1134 if (UseAutoGCSelectPolicy &&
1135 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1136 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1137 if (PrintGCDetails) {
1138 // Cannot use gclog_or_tty yet.
1139 tty->print_cr("Automatic selection of the low pause collector"
1140 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1141 }
1142 return true;
1143 }
1144 return false;
1145 }
1147 void Arguments::set_ergonomics_flags() {
1148 // Parallel GC is not compatible with sharing. If one specifies
1149 // that they want sharing explicitly, do not set ergonmics flags.
1150 if (DumpSharedSpaces || ForceSharedSpaces) {
1151 return;
1152 }
1154 if (os::is_server_class_machine() && !force_client_mode ) {
1155 // If no other collector is requested explicitly,
1156 // let the VM select the collector based on
1157 // machine class and automatic selection policy.
1158 if (!UseSerialGC &&
1159 !UseConcMarkSweepGC &&
1160 !UseParNewGC &&
1161 !DumpSharedSpaces &&
1162 FLAG_IS_DEFAULT(UseParallelGC)) {
1163 if (should_auto_select_low_pause_collector()) {
1164 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1165 } else {
1166 FLAG_SET_ERGO(bool, UseParallelGC, true);
1167 }
1168 no_shared_spaces();
1169 }
1170 }
1172 #ifdef _LP64
1173 // Compressed Headers do not work with CMS, which uses a bit in the klass
1174 // field offset to determine free list chunk markers.
1175 // Check that UseCompressedOops can be set with the max heap size allocated
1176 // by ergonomics.
1177 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1178 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1179 // Leave compressed oops off by default. Uncomment
1180 // the following line to return it to default status.
1181 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1182 }
1183 } else {
1184 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1185 // If specified, give a warning
1186 if (UseConcMarkSweepGC){
1187 warning("Compressed Oops does not work with CMS");
1188 } else {
1189 warning(
1190 "Max heap size too large for Compressed Oops");
1191 }
1192 FLAG_SET_DEFAULT(UseCompressedOops, false);
1193 }
1194 }
1195 // Also checks that certain machines are slower with compressed oops
1196 // in vm_version initialization code.
1197 #endif // _LP64
1198 }
1200 void Arguments::set_parallel_gc_flags() {
1201 // If parallel old was requested, automatically enable parallel scavenge.
1202 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1203 FLAG_SET_DEFAULT(UseParallelGC, true);
1204 }
1206 // If no heap maximum was requested explicitly, use some reasonable fraction
1207 // of the physical memory, up to a maximum of 1GB.
1208 if (UseParallelGC) {
1209 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1210 Abstract_VM_Version::parallel_worker_threads());
1212 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1213 const uint64_t reasonable_fraction =
1214 os::physical_memory() / DefaultMaxRAMFraction;
1215 const uint64_t maximum_size = (uint64_t)
1216 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1217 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1218 DefaultMaxRAM);
1219 size_t reasonable_max =
1220 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1221 if (reasonable_max > maximum_size) {
1222 reasonable_max = maximum_size;
1223 }
1224 if (PrintGCDetails && Verbose) {
1225 // Cannot use gclog_or_tty yet.
1226 tty->print_cr(" Max heap size for server class platform "
1227 SIZE_FORMAT, reasonable_max);
1228 }
1229 // If the initial_heap_size has not been set with -Xms,
1230 // then set it as fraction of size of physical memory
1231 // respecting the maximum and minimum sizes of the heap.
1232 if (initial_heap_size() == 0) {
1233 const uint64_t reasonable_initial_fraction =
1234 os::physical_memory() / DefaultInitialRAMFraction;
1235 const size_t reasonable_initial =
1236 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1237 const size_t minimum_size = NewSize + OldSize;
1238 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1239 minimum_size));
1240 // Currently the minimum size and the initial heap sizes are the same.
1241 set_min_heap_size(initial_heap_size());
1242 if (PrintGCDetails && Verbose) {
1243 // Cannot use gclog_or_tty yet.
1244 tty->print_cr(" Initial heap size for server class platform "
1245 SIZE_FORMAT, initial_heap_size());
1246 }
1247 } else {
1248 // An minimum size was specified on the command line. Be sure
1249 // that the maximum size is consistent.
1250 if (initial_heap_size() > reasonable_max) {
1251 reasonable_max = initial_heap_size();
1252 }
1253 }
1254 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1255 }
1257 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1258 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1259 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1260 // See CR 6362902 for details.
1261 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1262 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1263 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1264 }
1265 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1266 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1267 }
1268 }
1270 if (UseParallelOldGC) {
1271 // Par compact uses lower default values since they are treated as
1272 // minimums. These are different defaults because of the different
1273 // interpretation and are not ergonomically set.
1274 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1275 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1276 }
1277 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1278 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1279 }
1280 }
1281 }
1282 }
1284 // This must be called after ergonomics because we want bytecode rewriting
1285 // if the server compiler is used, or if UseSharedSpaces is disabled.
1286 void Arguments::set_bytecode_flags() {
1287 // Better not attempt to store into a read-only space.
1288 if (UseSharedSpaces) {
1289 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1290 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1291 }
1293 if (!RewriteBytecodes) {
1294 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1295 }
1296 }
1298 // Aggressive optimization flags -XX:+AggressiveOpts
1299 void Arguments::set_aggressive_opts_flags() {
1300 #ifdef COMPILER2
1301 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1302 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1303 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1304 }
1305 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1306 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1307 }
1309 // Feed the cache size setting into the JDK
1310 char buffer[1024];
1311 sprintf(buffer, "java.lang.Integer.IntegerCache.high=%d", AutoBoxCacheMax);
1312 add_property(buffer);
1313 }
1314 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1315 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1316 }
1317 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) {
1318 FLAG_SET_DEFAULT(SpecialArraysEquals, true);
1319 }
1320 #endif
1322 if (AggressiveOpts) {
1323 // Sample flag setting code
1324 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1325 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1326 // }
1327 }
1328 }
1330 //===========================================================================================================
1331 // Parsing of java.compiler property
1333 void Arguments::process_java_compiler_argument(char* arg) {
1334 // For backwards compatibility, Djava.compiler=NONE or ""
1335 // causes us to switch to -Xint mode UNLESS -Xdebug
1336 // is also specified.
1337 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1338 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1339 }
1340 }
1342 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1343 _sun_java_launcher = strdup(launcher);
1344 }
1346 bool Arguments::created_by_java_launcher() {
1347 assert(_sun_java_launcher != NULL, "property must have value");
1348 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1349 }
1351 //===========================================================================================================
1352 // Parsing of main arguments
1354 bool Arguments::verify_percentage(uintx value, const char* name) {
1355 if (value <= 100) {
1356 return true;
1357 }
1358 jio_fprintf(defaultStream::error_stream(),
1359 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1360 name, value);
1361 return false;
1362 }
1364 static void set_serial_gc_flags() {
1365 FLAG_SET_DEFAULT(UseSerialGC, true);
1366 FLAG_SET_DEFAULT(UseParNewGC, false);
1367 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1368 FLAG_SET_DEFAULT(UseParallelGC, false);
1369 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1370 }
1372 static bool verify_serial_gc_flags() {
1373 return (UseSerialGC &&
1374 !(UseParNewGC || UseConcMarkSweepGC || UseParallelGC ||
1375 UseParallelOldGC));
1376 }
1378 // Check consistency of GC selection
1379 bool Arguments::check_gc_consistency() {
1380 bool status = true;
1381 // Ensure that the user has not selected conflicting sets
1382 // of collectors. [Note: this check is merely a user convenience;
1383 // collectors over-ride each other so that only a non-conflicting
1384 // set is selected; however what the user gets is not what they
1385 // may have expected from the combination they asked for. It's
1386 // better to reduce user confusion by not allowing them to
1387 // select conflicting combinations.
1388 uint i = 0;
1389 if (UseSerialGC) i++;
1390 if (UseConcMarkSweepGC || UseParNewGC) i++;
1391 if (UseParallelGC || UseParallelOldGC) i++;
1392 if (i > 1) {
1393 jio_fprintf(defaultStream::error_stream(),
1394 "Conflicting collector combinations in option list; "
1395 "please refer to the release notes for the combinations "
1396 "allowed\n");
1397 status = false;
1398 }
1400 return status;
1401 }
1403 // Check the consistency of vm_init_args
1404 bool Arguments::check_vm_args_consistency() {
1405 // Method for adding checks for flag consistency.
1406 // The intent is to warn the user of all possible conflicts,
1407 // before returning an error.
1408 // Note: Needs platform-dependent factoring.
1409 bool status = true;
1411 #if ( (defined(COMPILER2) && defined(SPARC)))
1412 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1413 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1414 // x86. Normally, VM_Version_init must be called from init_globals in
1415 // init.cpp, which is called by the initial java thread *after* arguments
1416 // have been parsed. VM_Version_init gets called twice on sparc.
1417 extern void VM_Version_init();
1418 VM_Version_init();
1419 if (!VM_Version::has_v9()) {
1420 jio_fprintf(defaultStream::error_stream(),
1421 "V8 Machine detected, Server requires V9\n");
1422 status = false;
1423 }
1424 #endif /* COMPILER2 && SPARC */
1426 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1427 // builds so the cost of stack banging can be measured.
1428 #if (defined(PRODUCT) && defined(SOLARIS))
1429 if (!UseBoundThreads && !UseStackBanging) {
1430 jio_fprintf(defaultStream::error_stream(),
1431 "-UseStackBanging conflicts with -UseBoundThreads\n");
1433 status = false;
1434 }
1435 #endif
1437 if (TLABRefillWasteFraction == 0) {
1438 jio_fprintf(defaultStream::error_stream(),
1439 "TLABRefillWasteFraction should be a denominator, "
1440 "not " SIZE_FORMAT "\n",
1441 TLABRefillWasteFraction);
1442 status = false;
1443 }
1445 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1446 "MaxLiveObjectEvacuationRatio");
1447 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1448 "AdaptiveSizePolicyWeight");
1449 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1450 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1451 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1452 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1454 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1455 jio_fprintf(defaultStream::error_stream(),
1456 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1457 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1458 MinHeapFreeRatio, MaxHeapFreeRatio);
1459 status = false;
1460 }
1461 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1462 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1464 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1465 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1466 }
1468 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1469 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1470 if (GCTimeLimit == 100) {
1471 // Turn off gc-overhead-limit-exceeded checks
1472 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1473 }
1475 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1477 // Check user specified sharing option conflict with Parallel GC
1478 bool cannot_share = (UseConcMarkSweepGC || UseParallelGC ||
1479 UseParallelOldGC || UseParNewGC ||
1480 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1482 if (cannot_share) {
1483 // Either force sharing on by forcing the other options off, or
1484 // force sharing off.
1485 if (DumpSharedSpaces || ForceSharedSpaces) {
1486 set_serial_gc_flags();
1487 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1488 } else {
1489 no_shared_spaces();
1490 }
1491 }
1493 status = status && check_gc_consistency();
1495 if (_has_alloc_profile) {
1496 if (UseParallelGC || UseParallelOldGC) {
1497 jio_fprintf(defaultStream::error_stream(),
1498 "error: invalid argument combination.\n"
1499 "Allocation profiling (-Xaprof) cannot be used together with "
1500 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1501 status = false;
1502 }
1503 if (UseConcMarkSweepGC) {
1504 jio_fprintf(defaultStream::error_stream(),
1505 "error: invalid argument combination.\n"
1506 "Allocation profiling (-Xaprof) cannot be used together with "
1507 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1508 status = false;
1509 }
1510 }
1512 if (CMSIncrementalMode) {
1513 if (!UseConcMarkSweepGC) {
1514 jio_fprintf(defaultStream::error_stream(),
1515 "error: invalid argument combination.\n"
1516 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1517 "selected in order\nto use CMSIncrementalMode.\n");
1518 status = false;
1519 } else if (!UseTLAB) {
1520 jio_fprintf(defaultStream::error_stream(),
1521 "error: CMSIncrementalMode requires thread-local "
1522 "allocation buffers\n(-XX:+UseTLAB).\n");
1523 status = false;
1524 } else {
1525 status = status && verify_percentage(CMSIncrementalDutyCycle,
1526 "CMSIncrementalDutyCycle");
1527 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1528 "CMSIncrementalDutyCycleMin");
1529 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1530 "CMSIncrementalSafetyFactor");
1531 status = status && verify_percentage(CMSIncrementalOffset,
1532 "CMSIncrementalOffset");
1533 status = status && verify_percentage(CMSExpAvgFactor,
1534 "CMSExpAvgFactor");
1535 // If it was not set on the command line, set
1536 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1537 if (CMSInitiatingOccupancyFraction < 0) {
1538 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1539 }
1540 }
1541 }
1543 if (UseNUMA && !UseTLAB) {
1544 jio_fprintf(defaultStream::error_stream(),
1545 "error: NUMA allocator (-XX:+UseNUMA) requires thread-local "
1546 "allocation\nbuffers (-XX:+UseTLAB).\n");
1547 status = false;
1548 }
1550 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1551 // insists that we hold the requisite locks so that the iteration is
1552 // MT-safe. For the verification at start-up and shut-down, we don't
1553 // yet have a good way of acquiring and releasing these locks,
1554 // which are not visible at the CollectedHeap level. We want to
1555 // be able to acquire these locks and then do the iteration rather
1556 // than just disable the lock verification. This will be fixed under
1557 // bug 4788986.
1558 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1559 if (VerifyGCStartAt == 0) {
1560 warning("Heap verification at start-up disabled "
1561 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1562 VerifyGCStartAt = 1; // Disable verification at start-up
1563 }
1564 if (VerifyBeforeExit) {
1565 warning("Heap verification at shutdown disabled "
1566 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1567 VerifyBeforeExit = false; // Disable verification at shutdown
1568 }
1569 }
1571 // Note: only executed in non-PRODUCT mode
1572 if (!UseAsyncConcMarkSweepGC &&
1573 (ExplicitGCInvokesConcurrent ||
1574 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1575 jio_fprintf(defaultStream::error_stream(),
1576 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1577 " with -UseAsyncConcMarkSweepGC");
1578 status = false;
1579 }
1581 return status;
1582 }
1584 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1585 const char* option_type) {
1586 if (ignore) return false;
1588 const char* spacer = " ";
1589 if (option_type == NULL) {
1590 option_type = ++spacer; // Set both to the empty string.
1591 }
1593 if (os::obsolete_option(option)) {
1594 jio_fprintf(defaultStream::error_stream(),
1595 "Obsolete %s%soption: %s\n", option_type, spacer,
1596 option->optionString);
1597 return false;
1598 } else {
1599 jio_fprintf(defaultStream::error_stream(),
1600 "Unrecognized %s%soption: %s\n", option_type, spacer,
1601 option->optionString);
1602 return true;
1603 }
1604 }
1606 static const char* user_assertion_options[] = {
1607 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1608 };
1610 static const char* system_assertion_options[] = {
1611 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1612 };
1614 // Return true if any of the strings in null-terminated array 'names' matches.
1615 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1616 // the option must match exactly.
1617 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1618 bool tail_allowed) {
1619 for (/* empty */; *names != NULL; ++names) {
1620 if (match_option(option, *names, tail)) {
1621 if (**tail == '\0' || tail_allowed && **tail == ':') {
1622 return true;
1623 }
1624 }
1625 }
1626 return false;
1627 }
1629 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1630 jlong* long_arg,
1631 jlong min_size) {
1632 if (!atomll(s, long_arg)) return arg_unreadable;
1633 return check_memory_size(*long_arg, min_size);
1634 }
1636 // Parse JavaVMInitArgs structure
1638 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1639 // For components of the system classpath.
1640 SysClassPath scp(Arguments::get_sysclasspath());
1641 bool scp_assembly_required = false;
1643 // Save default settings for some mode flags
1644 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1645 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1646 Arguments::_ClipInlining = ClipInlining;
1647 Arguments::_BackgroundCompilation = BackgroundCompilation;
1648 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1650 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1651 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1652 if (result != JNI_OK) {
1653 return result;
1654 }
1656 // Parse JavaVMInitArgs structure passed in
1657 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1658 if (result != JNI_OK) {
1659 return result;
1660 }
1662 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1663 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1664 if (result != JNI_OK) {
1665 return result;
1666 }
1668 // Do final processing now that all arguments have been parsed
1669 result = finalize_vm_init_args(&scp, scp_assembly_required);
1670 if (result != JNI_OK) {
1671 return result;
1672 }
1674 return JNI_OK;
1675 }
1678 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1679 SysClassPath* scp_p,
1680 bool* scp_assembly_required_p,
1681 FlagValueOrigin origin) {
1682 // Remaining part of option string
1683 const char* tail;
1685 // iterate over arguments
1686 for (int index = 0; index < args->nOptions; index++) {
1687 bool is_absolute_path = false; // for -agentpath vs -agentlib
1689 const JavaVMOption* option = args->options + index;
1691 if (!match_option(option, "-Djava.class.path", &tail) &&
1692 !match_option(option, "-Dsun.java.command", &tail) &&
1693 !match_option(option, "-Dsun.java.launcher", &tail)) {
1695 // add all jvm options to the jvm_args string. This string
1696 // is used later to set the java.vm.args PerfData string constant.
1697 // the -Djava.class.path and the -Dsun.java.command options are
1698 // omitted from jvm_args string as each have their own PerfData
1699 // string constant object.
1700 build_jvm_args(option->optionString);
1701 }
1703 // -verbose:[class/gc/jni]
1704 if (match_option(option, "-verbose", &tail)) {
1705 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1706 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1707 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1708 } else if (!strcmp(tail, ":gc")) {
1709 FLAG_SET_CMDLINE(bool, PrintGC, true);
1710 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1711 } else if (!strcmp(tail, ":jni")) {
1712 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1713 }
1714 // -da / -ea / -disableassertions / -enableassertions
1715 // These accept an optional class/package name separated by a colon, e.g.,
1716 // -da:java.lang.Thread.
1717 } else if (match_option(option, user_assertion_options, &tail, true)) {
1718 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1719 if (*tail == '\0') {
1720 JavaAssertions::setUserClassDefault(enable);
1721 } else {
1722 assert(*tail == ':', "bogus match by match_option()");
1723 JavaAssertions::addOption(tail + 1, enable);
1724 }
1725 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1726 } else if (match_option(option, system_assertion_options, &tail, false)) {
1727 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1728 JavaAssertions::setSystemClassDefault(enable);
1729 // -bootclasspath:
1730 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1731 scp_p->reset_path(tail);
1732 *scp_assembly_required_p = true;
1733 // -bootclasspath/a:
1734 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1735 scp_p->add_suffix(tail);
1736 *scp_assembly_required_p = true;
1737 // -bootclasspath/p:
1738 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1739 scp_p->add_prefix(tail);
1740 *scp_assembly_required_p = true;
1741 // -Xrun
1742 } else if (match_option(option, "-Xrun", &tail)) {
1743 if(tail != NULL) {
1744 const char* pos = strchr(tail, ':');
1745 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1746 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1747 name[len] = '\0';
1749 char *options = NULL;
1750 if(pos != NULL) {
1751 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1752 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1753 }
1754 #ifdef JVMTI_KERNEL
1755 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1756 warning("profiling and debugging agents are not supported with Kernel VM");
1757 } else
1758 #endif // JVMTI_KERNEL
1759 add_init_library(name, options);
1760 }
1761 // -agentlib and -agentpath
1762 } else if (match_option(option, "-agentlib:", &tail) ||
1763 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1764 if(tail != NULL) {
1765 const char* pos = strchr(tail, '=');
1766 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1767 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1768 name[len] = '\0';
1770 char *options = NULL;
1771 if(pos != NULL) {
1772 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1773 }
1774 #ifdef JVMTI_KERNEL
1775 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1776 warning("profiling and debugging agents are not supported with Kernel VM");
1777 } else
1778 #endif // JVMTI_KERNEL
1779 add_init_agent(name, options, is_absolute_path);
1781 }
1782 // -javaagent
1783 } else if (match_option(option, "-javaagent:", &tail)) {
1784 if(tail != NULL) {
1785 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1786 add_init_agent("instrument", options, false);
1787 }
1788 // -Xnoclassgc
1789 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1790 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1791 // -Xincgc: i-CMS
1792 } else if (match_option(option, "-Xincgc", &tail)) {
1793 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1794 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1795 // -Xnoincgc: no i-CMS
1796 } else if (match_option(option, "-Xnoincgc", &tail)) {
1797 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1798 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1799 // -Xconcgc
1800 } else if (match_option(option, "-Xconcgc", &tail)) {
1801 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1802 // -Xnoconcgc
1803 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1804 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1805 // -Xbatch
1806 } else if (match_option(option, "-Xbatch", &tail)) {
1807 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1808 // -Xmn for compatibility with other JVM vendors
1809 } else if (match_option(option, "-Xmn", &tail)) {
1810 jlong long_initial_eden_size = 0;
1811 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1812 if (errcode != arg_in_range) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "Invalid initial eden size: %s\n", option->optionString);
1815 describe_range_error(errcode);
1816 return JNI_EINVAL;
1817 }
1818 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1819 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1820 // -Xms
1821 } else if (match_option(option, "-Xms", &tail)) {
1822 jlong long_initial_heap_size = 0;
1823 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1824 if (errcode != arg_in_range) {
1825 jio_fprintf(defaultStream::error_stream(),
1826 "Invalid initial heap size: %s\n", option->optionString);
1827 describe_range_error(errcode);
1828 return JNI_EINVAL;
1829 }
1830 set_initial_heap_size((size_t) long_initial_heap_size);
1831 // Currently the minimum size and the initial heap sizes are the same.
1832 set_min_heap_size(initial_heap_size());
1833 // -Xmx
1834 } else if (match_option(option, "-Xmx", &tail)) {
1835 jlong long_max_heap_size = 0;
1836 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1837 if (errcode != arg_in_range) {
1838 jio_fprintf(defaultStream::error_stream(),
1839 "Invalid maximum heap size: %s\n", option->optionString);
1840 describe_range_error(errcode);
1841 return JNI_EINVAL;
1842 }
1843 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1844 // Xmaxf
1845 } else if (match_option(option, "-Xmaxf", &tail)) {
1846 int maxf = (int)(atof(tail) * 100);
1847 if (maxf < 0 || maxf > 100) {
1848 jio_fprintf(defaultStream::error_stream(),
1849 "Bad max heap free percentage size: %s\n",
1850 option->optionString);
1851 return JNI_EINVAL;
1852 } else {
1853 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1854 }
1855 // Xminf
1856 } else if (match_option(option, "-Xminf", &tail)) {
1857 int minf = (int)(atof(tail) * 100);
1858 if (minf < 0 || minf > 100) {
1859 jio_fprintf(defaultStream::error_stream(),
1860 "Bad min heap free percentage size: %s\n",
1861 option->optionString);
1862 return JNI_EINVAL;
1863 } else {
1864 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1865 }
1866 // -Xss
1867 } else if (match_option(option, "-Xss", &tail)) {
1868 jlong long_ThreadStackSize = 0;
1869 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1870 if (errcode != arg_in_range) {
1871 jio_fprintf(defaultStream::error_stream(),
1872 "Invalid thread stack size: %s\n", option->optionString);
1873 describe_range_error(errcode);
1874 return JNI_EINVAL;
1875 }
1876 // Internally track ThreadStackSize in units of 1024 bytes.
1877 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1878 round_to((int)long_ThreadStackSize, K) / K);
1879 // -Xoss
1880 } else if (match_option(option, "-Xoss", &tail)) {
1881 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1882 // -Xmaxjitcodesize
1883 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1884 jlong long_ReservedCodeCacheSize = 0;
1885 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1886 InitialCodeCacheSize);
1887 if (errcode != arg_in_range) {
1888 jio_fprintf(defaultStream::error_stream(),
1889 "Invalid maximum code cache size: %s\n",
1890 option->optionString);
1891 describe_range_error(errcode);
1892 return JNI_EINVAL;
1893 }
1894 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1895 // -green
1896 } else if (match_option(option, "-green", &tail)) {
1897 jio_fprintf(defaultStream::error_stream(),
1898 "Green threads support not available\n");
1899 return JNI_EINVAL;
1900 // -native
1901 } else if (match_option(option, "-native", &tail)) {
1902 // HotSpot always uses native threads, ignore silently for compatibility
1903 // -Xsqnopause
1904 } else if (match_option(option, "-Xsqnopause", &tail)) {
1905 // EVM option, ignore silently for compatibility
1906 // -Xrs
1907 } else if (match_option(option, "-Xrs", &tail)) {
1908 // Classic/EVM option, new functionality
1909 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1910 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1911 // change default internal VM signals used - lower case for back compat
1912 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1913 // -Xoptimize
1914 } else if (match_option(option, "-Xoptimize", &tail)) {
1915 // EVM option, ignore silently for compatibility
1916 // -Xprof
1917 } else if (match_option(option, "-Xprof", &tail)) {
1918 #ifndef FPROF_KERNEL
1919 _has_profile = true;
1920 #else // FPROF_KERNEL
1921 // do we have to exit?
1922 warning("Kernel VM does not support flat profiling.");
1923 #endif // FPROF_KERNEL
1924 // -Xaprof
1925 } else if (match_option(option, "-Xaprof", &tail)) {
1926 _has_alloc_profile = true;
1927 // -Xconcurrentio
1928 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1929 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1930 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1931 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
1932 FLAG_SET_CMDLINE(bool, UseTLAB, false);
1933 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
1935 // -Xinternalversion
1936 } else if (match_option(option, "-Xinternalversion", &tail)) {
1937 jio_fprintf(defaultStream::output_stream(), "%s\n",
1938 VM_Version::internal_vm_info_string());
1939 vm_exit(0);
1940 #ifndef PRODUCT
1941 // -Xprintflags
1942 } else if (match_option(option, "-Xprintflags", &tail)) {
1943 CommandLineFlags::printFlags();
1944 vm_exit(0);
1945 #endif
1946 // -D
1947 } else if (match_option(option, "-D", &tail)) {
1948 if (!add_property(tail)) {
1949 return JNI_ENOMEM;
1950 }
1951 // Out of the box management support
1952 if (match_option(option, "-Dcom.sun.management", &tail)) {
1953 FLAG_SET_CMDLINE(bool, ManagementServer, true);
1954 }
1955 // -Xint
1956 } else if (match_option(option, "-Xint", &tail)) {
1957 set_mode_flags(_int);
1958 // -Xmixed
1959 } else if (match_option(option, "-Xmixed", &tail)) {
1960 set_mode_flags(_mixed);
1961 // -Xcomp
1962 } else if (match_option(option, "-Xcomp", &tail)) {
1963 // for testing the compiler; turn off all flags that inhibit compilation
1964 set_mode_flags(_comp);
1966 // -Xshare:dump
1967 } else if (match_option(option, "-Xshare:dump", &tail)) {
1968 #ifdef TIERED
1969 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
1970 set_mode_flags(_int); // Prevent compilation, which creates objects
1971 #elif defined(COMPILER2)
1972 vm_exit_during_initialization(
1973 "Dumping a shared archive is not supported on the Server JVM.", NULL);
1974 #elif defined(KERNEL)
1975 vm_exit_during_initialization(
1976 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
1977 #else
1978 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
1979 set_mode_flags(_int); // Prevent compilation, which creates objects
1980 #endif
1981 // -Xshare:on
1982 } else if (match_option(option, "-Xshare:on", &tail)) {
1983 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
1984 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
1985 #ifdef TIERED
1986 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
1987 #endif // TIERED
1988 // -Xshare:auto
1989 } else if (match_option(option, "-Xshare:auto", &tail)) {
1990 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
1991 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
1992 // -Xshare:off
1993 } else if (match_option(option, "-Xshare:off", &tail)) {
1994 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
1995 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
1997 // -Xverify
1998 } else if (match_option(option, "-Xverify", &tail)) {
1999 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2000 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2001 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2002 } else if (strcmp(tail, ":remote") == 0) {
2003 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2004 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2005 } else if (strcmp(tail, ":none") == 0) {
2006 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2007 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2008 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2009 return JNI_EINVAL;
2010 }
2011 // -Xdebug
2012 } else if (match_option(option, "-Xdebug", &tail)) {
2013 // note this flag has been used, then ignore
2014 set_xdebug_mode(true);
2015 // -Xnoagent
2016 } else if (match_option(option, "-Xnoagent", &tail)) {
2017 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2018 } else if (match_option(option, "-Xboundthreads", &tail)) {
2019 // Bind user level threads to kernel threads (Solaris only)
2020 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2021 } else if (match_option(option, "-Xloggc:", &tail)) {
2022 // Redirect GC output to the file. -Xloggc:<filename>
2023 // ostream_init_log(), when called will use this filename
2024 // to initialize a fileStream.
2025 _gc_log_filename = strdup(tail);
2026 FLAG_SET_CMDLINE(bool, PrintGC, true);
2027 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2028 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2030 // JNI hooks
2031 } else if (match_option(option, "-Xcheck", &tail)) {
2032 if (!strcmp(tail, ":jni")) {
2033 CheckJNICalls = true;
2034 } else if (is_bad_option(option, args->ignoreUnrecognized,
2035 "check")) {
2036 return JNI_EINVAL;
2037 }
2038 } else if (match_option(option, "vfprintf", &tail)) {
2039 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2040 } else if (match_option(option, "exit", &tail)) {
2041 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2042 } else if (match_option(option, "abort", &tail)) {
2043 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2044 // -XX:+AggressiveHeap
2045 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2047 // This option inspects the machine and attempts to set various
2048 // parameters to be optimal for long-running, memory allocation
2049 // intensive jobs. It is intended for machines with large
2050 // amounts of cpu and memory.
2052 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2053 // VM, but we may not be able to represent the total physical memory
2054 // available (like having 8gb of memory on a box but using a 32bit VM).
2055 // Thus, we need to make sure we're using a julong for intermediate
2056 // calculations.
2057 julong initHeapSize;
2058 julong total_memory = os::physical_memory();
2060 if (total_memory < (julong)256*M) {
2061 jio_fprintf(defaultStream::error_stream(),
2062 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2063 vm_exit(1);
2064 }
2066 // The heap size is half of available memory, or (at most)
2067 // all of possible memory less 160mb (leaving room for the OS
2068 // when using ISM). This is the maximum; because adaptive sizing
2069 // is turned on below, the actual space used may be smaller.
2071 initHeapSize = MIN2(total_memory / (julong)2,
2072 total_memory - (julong)160*M);
2074 // Make sure that if we have a lot of memory we cap the 32 bit
2075 // process space. The 64bit VM version of this function is a nop.
2076 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2078 // The perm gen is separate but contiguous with the
2079 // object heap (and is reserved with it) so subtract it
2080 // from the heap size.
2081 if (initHeapSize > MaxPermSize) {
2082 initHeapSize = initHeapSize - MaxPermSize;
2083 } else {
2084 warning("AggressiveHeap and MaxPermSize values may conflict");
2085 }
2087 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2088 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2089 set_initial_heap_size(MaxHeapSize);
2090 // Currently the minimum size and the initial heap sizes are the same.
2091 set_min_heap_size(initial_heap_size());
2092 }
2093 if (FLAG_IS_DEFAULT(NewSize)) {
2094 // Make the young generation 3/8ths of the total heap.
2095 FLAG_SET_CMDLINE(uintx, NewSize,
2096 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2097 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2098 }
2100 FLAG_SET_DEFAULT(UseLargePages, true);
2102 // Increase some data structure sizes for efficiency
2103 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2104 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2105 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2107 // See the OldPLABSize comment below, but replace 'after promotion'
2108 // with 'after copying'. YoungPLABSize is the size of the survivor
2109 // space per-gc-thread buffers. The default is 4kw.
2110 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2112 // OldPLABSize is the size of the buffers in the old gen that
2113 // UseParallelGC uses to promote live data that doesn't fit in the
2114 // survivor spaces. At any given time, there's one for each gc thread.
2115 // The default size is 1kw. These buffers are rarely used, since the
2116 // survivor spaces are usually big enough. For specjbb, however, there
2117 // are occasions when there's lots of live data in the young gen
2118 // and we end up promoting some of it. We don't have a definite
2119 // explanation for why bumping OldPLABSize helps, but the theory
2120 // is that a bigger PLAB results in retaining something like the
2121 // original allocation order after promotion, which improves mutator
2122 // locality. A minor effect may be that larger PLABs reduce the
2123 // number of PLAB allocation events during gc. The value of 8kw
2124 // was arrived at by experimenting with specjbb.
2125 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2127 // CompilationPolicyChoice=0 causes the server compiler to adopt
2128 // a more conservative which-method-do-I-compile policy when one
2129 // of the counters maintained by the interpreter trips. The
2130 // result is reduced startup time and improved specjbb and
2131 // alacrity performance. Zero is the default, but we set it
2132 // explicitly here in case the default changes.
2133 // See runtime/compilationPolicy.*.
2134 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2136 // Enable parallel GC and adaptive generation sizing
2137 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2138 FLAG_SET_DEFAULT(ParallelGCThreads,
2139 Abstract_VM_Version::parallel_worker_threads());
2141 // Encourage steady state memory management
2142 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2144 // This appears to improve mutator locality
2145 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2147 // Get around early Solaris scheduling bug
2148 // (affinity vs other jobs on system)
2149 // but disallow DR and offlining (5008695).
2150 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2152 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2153 // The last option must always win.
2154 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2155 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2156 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2157 // The last option must always win.
2158 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2159 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2160 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2161 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2162 jio_fprintf(defaultStream::error_stream(),
2163 "Please use CMSClassUnloadingEnabled in place of "
2164 "CMSPermGenSweepingEnabled in the future\n");
2165 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2166 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2167 jio_fprintf(defaultStream::error_stream(),
2168 "Please use -XX:+UseGCOverheadLimit in place of "
2169 "-XX:+UseGCTimeLimit in the future\n");
2170 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2171 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2172 jio_fprintf(defaultStream::error_stream(),
2173 "Please use -XX:-UseGCOverheadLimit in place of "
2174 "-XX:-UseGCTimeLimit in the future\n");
2175 // The TLE options are for compatibility with 1.3 and will be
2176 // removed without notice in a future release. These options
2177 // are not to be documented.
2178 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2179 // No longer used.
2180 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2181 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2182 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2183 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2184 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2185 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2186 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2187 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2188 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2189 // No longer used.
2190 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2191 jlong long_tlab_size = 0;
2192 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2193 if (errcode != arg_in_range) {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "Invalid TLAB size: %s\n", option->optionString);
2196 describe_range_error(errcode);
2197 return JNI_EINVAL;
2198 }
2199 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2200 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2201 // No longer used.
2202 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2203 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2204 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2205 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2206 SOLARIS_ONLY(
2207 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2208 warning("-XX:+UsePermISM is obsolete.");
2209 FLAG_SET_CMDLINE(bool, UseISM, true);
2210 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2211 FLAG_SET_CMDLINE(bool, UseISM, false);
2212 )
2213 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2214 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2215 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2216 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2217 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2218 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2219 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2220 #ifdef SOLARIS
2221 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2222 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2223 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2224 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2225 #else // ndef SOLARIS
2226 jio_fprintf(defaultStream::error_stream(),
2227 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2228 return JNI_EINVAL;
2229 #endif // ndef SOLARIS
2230 } else
2231 #ifdef ASSERT
2232 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2233 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2234 // disable scavenge before parallel mark-compact
2235 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2236 } else
2237 #endif
2238 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2239 julong cms_blocks_to_claim = (julong)atol(tail);
2240 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2241 jio_fprintf(defaultStream::error_stream(),
2242 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2243 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2244 } else
2245 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2246 jlong old_plab_size = 0;
2247 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2248 if (errcode != arg_in_range) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Invalid old PLAB size: %s\n", option->optionString);
2251 describe_range_error(errcode);
2252 return JNI_EINVAL;
2253 }
2254 FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size);
2255 jio_fprintf(defaultStream::error_stream(),
2256 "Please use -XX:OldPLABSize in place of "
2257 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2258 } else
2259 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2260 jlong young_plab_size = 0;
2261 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2262 if (errcode != arg_in_range) {
2263 jio_fprintf(defaultStream::error_stream(),
2264 "Invalid young PLAB size: %s\n", option->optionString);
2265 describe_range_error(errcode);
2266 return JNI_EINVAL;
2267 }
2268 FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size);
2269 jio_fprintf(defaultStream::error_stream(),
2270 "Please use -XX:YoungPLABSize in place of "
2271 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2272 } else
2273 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2274 // Skip -XX:Flags= since that case has already been handled
2275 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2276 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2277 return JNI_EINVAL;
2278 }
2279 }
2280 // Unknown option
2281 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2282 return JNI_ERR;
2283 }
2284 }
2286 return JNI_OK;
2287 }
2289 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2290 // This must be done after all -D arguments have been processed.
2291 scp_p->expand_endorsed();
2293 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2294 // Assemble the bootclasspath elements into the final path.
2295 Arguments::set_sysclasspath(scp_p->combined_path());
2296 }
2298 // This must be done after all arguments have been processed.
2299 // java_compiler() true means set to "NONE" or empty.
2300 if (java_compiler() && !xdebug_mode()) {
2301 // For backwards compatibility, we switch to interpreted mode if
2302 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2303 // not specified.
2304 set_mode_flags(_int);
2305 }
2306 if (CompileThreshold == 0) {
2307 set_mode_flags(_int);
2308 }
2310 #ifdef TIERED
2311 // If we are using tiered compilation in the tiered vm then c1 will
2312 // do the profiling and we don't want to waste that time in the
2313 // interpreter.
2314 if (TieredCompilation) {
2315 ProfileInterpreter = false;
2316 } else {
2317 // Since we are running vanilla server we must adjust the compile threshold
2318 // unless the user has already adjusted it because the default threshold assumes
2319 // we will run tiered.
2321 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2322 CompileThreshold = Tier2CompileThreshold;
2323 }
2324 }
2325 #endif // TIERED
2327 #ifndef COMPILER2
2328 // Don't degrade server performance for footprint
2329 if (FLAG_IS_DEFAULT(UseLargePages) &&
2330 MaxHeapSize < LargePageHeapSizeThreshold) {
2331 // No need for large granularity pages w/small heaps.
2332 // Note that large pages are enabled/disabled for both the
2333 // Java heap and the code cache.
2334 FLAG_SET_DEFAULT(UseLargePages, false);
2335 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2336 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2337 }
2338 #else
2339 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2340 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2341 }
2342 #endif
2344 if (!check_vm_args_consistency()) {
2345 return JNI_ERR;
2346 }
2348 return JNI_OK;
2349 }
2351 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2352 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2353 scp_assembly_required_p);
2354 }
2356 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2357 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2358 scp_assembly_required_p);
2359 }
2361 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2362 const int N_MAX_OPTIONS = 64;
2363 const int OPTION_BUFFER_SIZE = 1024;
2364 char buffer[OPTION_BUFFER_SIZE];
2366 // The variable will be ignored if it exceeds the length of the buffer.
2367 // Don't check this variable if user has special privileges
2368 // (e.g. unix su command).
2369 if (os::getenv(name, buffer, sizeof(buffer)) &&
2370 !os::have_special_privileges()) {
2371 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Picked up %s: %s\n", name, buffer);
2374 char* rd = buffer; // pointer to the input string (rd)
2375 int i;
2376 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2377 while (isspace(*rd)) rd++; // skip whitespace
2378 if (*rd == 0) break; // we re done when the input string is read completely
2380 // The output, option string, overwrites the input string.
2381 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2382 // input string (rd).
2383 char* wrt = rd;
2385 options[i++].optionString = wrt; // Fill in option
2386 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2387 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2388 int quote = *rd; // matching quote to look for
2389 rd++; // don't copy open quote
2390 while (*rd != quote) { // include everything (even spaces) up until quote
2391 if (*rd == 0) { // string termination means unmatched string
2392 jio_fprintf(defaultStream::error_stream(),
2393 "Unmatched quote in %s\n", name);
2394 return JNI_ERR;
2395 }
2396 *wrt++ = *rd++; // copy to option string
2397 }
2398 rd++; // don't copy close quote
2399 } else {
2400 *wrt++ = *rd++; // copy to option string
2401 }
2402 }
2403 // Need to check if we're done before writing a NULL,
2404 // because the write could be to the byte that rd is pointing to.
2405 if (*rd++ == 0) {
2406 *wrt = 0;
2407 break;
2408 }
2409 *wrt = 0; // Zero terminate option
2410 }
2411 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2412 JavaVMInitArgs vm_args;
2413 vm_args.version = JNI_VERSION_1_2;
2414 vm_args.options = options;
2415 vm_args.nOptions = i;
2416 vm_args.ignoreUnrecognized = false;
2418 if (PrintVMOptions) {
2419 const char* tail;
2420 for (int i = 0; i < vm_args.nOptions; i++) {
2421 const JavaVMOption *option = vm_args.options + i;
2422 if (match_option(option, "-XX:", &tail)) {
2423 logOption(tail);
2424 }
2425 }
2426 }
2428 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2429 }
2430 return JNI_OK;
2431 }
2433 // Parse entry point called from JNI_CreateJavaVM
2435 jint Arguments::parse(const JavaVMInitArgs* args) {
2437 // Sharing support
2438 // Construct the path to the archive
2439 char jvm_path[JVM_MAXPATHLEN];
2440 os::jvm_path(jvm_path, sizeof(jvm_path));
2441 #ifdef TIERED
2442 if (strstr(jvm_path, "client") != NULL) {
2443 force_client_mode = true;
2444 }
2445 #endif // TIERED
2446 char *end = strrchr(jvm_path, *os::file_separator());
2447 if (end != NULL) *end = '\0';
2448 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2449 strlen(os::file_separator()) + 20);
2450 if (shared_archive_path == NULL) return JNI_ENOMEM;
2451 strcpy(shared_archive_path, jvm_path);
2452 strcat(shared_archive_path, os::file_separator());
2453 strcat(shared_archive_path, "classes");
2454 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2455 strcat(shared_archive_path, ".jsa");
2456 SharedArchivePath = shared_archive_path;
2458 // Remaining part of option string
2459 const char* tail;
2461 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2462 bool settings_file_specified = false;
2463 int index;
2464 for (index = 0; index < args->nOptions; index++) {
2465 const JavaVMOption *option = args->options + index;
2466 if (match_option(option, "-XX:Flags=", &tail)) {
2467 if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {
2468 return JNI_EINVAL;
2469 }
2470 settings_file_specified = true;
2471 }
2472 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2473 PrintVMOptions = true;
2474 }
2475 }
2477 // Parse default .hotspotrc settings file
2478 if (!settings_file_specified) {
2479 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2480 return JNI_EINVAL;
2481 }
2482 }
2484 if (PrintVMOptions) {
2485 for (index = 0; index < args->nOptions; index++) {
2486 const JavaVMOption *option = args->options + index;
2487 if (match_option(option, "-XX:", &tail)) {
2488 logOption(tail);
2489 }
2490 }
2491 }
2493 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2494 jint result = parse_vm_init_args(args);
2495 if (result != JNI_OK) {
2496 return result;
2497 }
2499 #ifndef PRODUCT
2500 if (TraceBytecodesAt != 0) {
2501 TraceBytecodes = true;
2502 }
2503 if (CountCompiledCalls) {
2504 if (UseCounterDecay) {
2505 warning("UseCounterDecay disabled because CountCalls is set");
2506 UseCounterDecay = false;
2507 }
2508 }
2509 #endif // PRODUCT
2511 if (PrintGCDetails) {
2512 // Turn on -verbose:gc options as well
2513 PrintGC = true;
2514 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2515 TraceClassUnloading = true;
2516 }
2517 }
2519 #ifdef SERIALGC
2520 set_serial_gc_flags();
2521 #endif // SERIALGC
2522 #ifdef KERNEL
2523 no_shared_spaces();
2524 #endif // KERNEL
2526 // Set flags based on ergonomics.
2527 set_ergonomics_flags();
2529 // Check the GC selections again.
2530 if (!check_gc_consistency()) {
2531 return JNI_EINVAL;
2532 }
2534 if (UseParallelGC || UseParallelOldGC) {
2535 // Set some flags for ParallelGC if needed.
2536 set_parallel_gc_flags();
2537 } else if (UseConcMarkSweepGC) {
2538 // Set some flags for CMS
2539 set_cms_and_parnew_gc_flags();
2540 } else if (UseParNewGC) {
2541 // Set some flags for ParNew
2542 set_parnew_gc_flags();
2543 }
2545 #ifdef SERIALGC
2546 assert(verify_serial_gc_flags(), "SerialGC unset");
2547 #endif // SERIALGC
2549 // Set bytecode rewriting flags
2550 set_bytecode_flags();
2552 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2553 set_aggressive_opts_flags();
2555 #ifdef CC_INTERP
2556 // Biased locking is not implemented with c++ interpreter
2557 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2558 #endif /* CC_INTERP */
2560 if (PrintCommandLineFlags) {
2561 CommandLineFlags::printSetFlags();
2562 }
2564 #ifdef ASSERT
2565 if (PrintFlagsFinal) {
2566 CommandLineFlags::printFlags();
2567 }
2568 #endif
2570 return JNI_OK;
2571 }
2573 int Arguments::PropertyList_count(SystemProperty* pl) {
2574 int count = 0;
2575 while(pl != NULL) {
2576 count++;
2577 pl = pl->next();
2578 }
2579 return count;
2580 }
2582 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2583 assert(key != NULL, "just checking");
2584 SystemProperty* prop;
2585 for (prop = pl; prop != NULL; prop = prop->next()) {
2586 if (strcmp(key, prop->key()) == 0) return prop->value();
2587 }
2588 return NULL;
2589 }
2591 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2592 int count = 0;
2593 const char* ret_val = NULL;
2595 while(pl != NULL) {
2596 if(count >= index) {
2597 ret_val = pl->key();
2598 break;
2599 }
2600 count++;
2601 pl = pl->next();
2602 }
2604 return ret_val;
2605 }
2607 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2608 int count = 0;
2609 char* ret_val = NULL;
2611 while(pl != NULL) {
2612 if(count >= index) {
2613 ret_val = pl->value();
2614 break;
2615 }
2616 count++;
2617 pl = pl->next();
2618 }
2620 return ret_val;
2621 }
2623 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2624 SystemProperty* p = *plist;
2625 if (p == NULL) {
2626 *plist = new_p;
2627 } else {
2628 while (p->next() != NULL) {
2629 p = p->next();
2630 }
2631 p->set_next(new_p);
2632 }
2633 }
2635 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2636 if (plist == NULL)
2637 return;
2639 SystemProperty* new_p = new SystemProperty(k, v, true);
2640 PropertyList_add(plist, new_p);
2641 }
2643 // This add maintains unique property key in the list.
2644 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
2645 if (plist == NULL)
2646 return;
2648 // If property key exist then update with new value.
2649 SystemProperty* prop;
2650 for (prop = *plist; prop != NULL; prop = prop->next()) {
2651 if (strcmp(k, prop->key()) == 0) {
2652 prop->set_value(v);
2653 return;
2654 }
2655 }
2657 PropertyList_add(plist, k, v);
2658 }
2660 #ifdef KERNEL
2661 char *Arguments::get_kernel_properties() {
2662 // Find properties starting with kernel and append them to string
2663 // We need to find out how long they are first because the URL's that they
2664 // might point to could get long.
2665 int length = 0;
2666 SystemProperty* prop;
2667 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2668 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2669 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2670 }
2671 }
2672 // Add one for null terminator.
2673 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2674 if (length != 0) {
2675 int pos = 0;
2676 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2677 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2678 jio_snprintf(&props[pos], length-pos,
2679 "-D%s=%s ", prop->key(), prop->value());
2680 pos = strlen(props);
2681 }
2682 }
2683 }
2684 // null terminate props in case of null
2685 props[length] = '\0';
2686 return props;
2687 }
2688 #endif // KERNEL
2690 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2691 // Returns true if all of the source pointed by src has been copied over to
2692 // the destination buffer pointed by buf. Otherwise, returns false.
2693 // Notes:
2694 // 1. If the length (buflen) of the destination buffer excluding the
2695 // NULL terminator character is not long enough for holding the expanded
2696 // pid characters, it also returns false instead of returning the partially
2697 // expanded one.
2698 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2699 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2700 char* buf, size_t buflen) {
2701 const char* p = src;
2702 char* b = buf;
2703 const char* src_end = &src[srclen];
2704 char* buf_end = &buf[buflen - 1];
2706 while (p < src_end && b < buf_end) {
2707 if (*p == '%') {
2708 switch (*(++p)) {
2709 case '%': // "%%" ==> "%"
2710 *b++ = *p++;
2711 break;
2712 case 'p': { // "%p" ==> current process id
2713 // buf_end points to the character before the last character so
2714 // that we could write '\0' to the end of the buffer.
2715 size_t buf_sz = buf_end - b + 1;
2716 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2718 // if jio_snprintf fails or the buffer is not long enough to hold
2719 // the expanded pid, returns false.
2720 if (ret < 0 || ret >= (int)buf_sz) {
2721 return false;
2722 } else {
2723 b += ret;
2724 assert(*b == '\0', "fail in copy_expand_pid");
2725 if (p == src_end && b == buf_end + 1) {
2726 // reach the end of the buffer.
2727 return true;
2728 }
2729 }
2730 p++;
2731 break;
2732 }
2733 default :
2734 *b++ = '%';
2735 }
2736 } else {
2737 *b++ = *p++;
2738 }
2739 }
2740 *b = '\0';
2741 return (p == src_end); // return false if not all of the source was copied
2742 }