1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
27
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
30
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_min_heap_size = 0;
41 Arguments::Mode Arguments::_mode = _mixed;
42 bool Arguments::_java_compiler = false;
43 bool Arguments::_xdebug_mode = false;
44 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
45 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
46 int Arguments::_sun_java_launcher_pid = -1;
47
48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
49 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
50 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
51 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
52 bool Arguments::_ClipInlining = ClipInlining;
53
54 char* Arguments::SharedArchivePath = NULL;
55
56 AgentLibraryList Arguments::_libraryList;
57 AgentLibraryList Arguments::_agentList;
58
59 abort_hook_t Arguments::_abort_hook = NULL;
60 exit_hook_t Arguments::_exit_hook = NULL;
61 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
62
63
64 SystemProperty *Arguments::_java_ext_dirs = NULL;
65 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
66 SystemProperty *Arguments::_sun_boot_library_path = NULL;
67 SystemProperty *Arguments::_java_library_path = NULL;
68 SystemProperty *Arguments::_java_home = NULL;
69 SystemProperty *Arguments::_java_class_path = NULL;
70 SystemProperty *Arguments::_sun_boot_class_path = NULL;
71
72 char* Arguments::_meta_index_path = NULL;
73 char* Arguments::_meta_index_dir = NULL;
74
75 static bool force_client_mode = false;
76
77 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
78
79 static bool match_option(const JavaVMOption *option, const char* name,
80 const char** tail) {
81 int len = (int)strlen(name);
82 if (strncmp(option->optionString, name, len) == 0) {
83 *tail = option->optionString + len;
84 return true;
85 } else {
86 return false;
87 }
88 }
89
90 static void logOption(const char* opt) {
91 if (PrintVMOptions) {
92 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
93 }
94 }
95
96 // Process java launcher properties.
97 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
98 // See if sun.java.launcher or sun.java.launcher.pid is defined.
99 // Must do this before setting up other system properties,
100 // as some of them may depend on launcher type.
101 for (int index = 0; index < args->nOptions; index++) {
102 const JavaVMOption* option = args->options + index;
103 const char* tail;
104
105 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
106 process_java_launcher_argument(tail, option->extraInfo);
107 continue;
108 }
109 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
110 _sun_java_launcher_pid = atoi(tail);
111 continue;
112 }
113 }
114 }
115
116 // Initialize system properties key and value.
117 void Arguments::init_system_properties() {
118
119 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
121 "Java Virtual Machine Specification", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
125
126 // following are JVMTI agent writeable properties.
127 // Properties values are set to NULL and they are
128 // os specific they are initialized in os::init_system_properties_values().
129 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
130 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
131 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
132 _java_library_path = new SystemProperty("java.library.path", NULL, true);
133 _java_home = new SystemProperty("java.home", NULL, true);
134 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
135
136 _java_class_path = new SystemProperty("java.class.path", "", true);
137
138 // Add to System Property list.
139 PropertyList_add(&_system_properties, _java_ext_dirs);
140 PropertyList_add(&_system_properties, _java_endorsed_dirs);
141 PropertyList_add(&_system_properties, _sun_boot_library_path);
142 PropertyList_add(&_system_properties, _java_library_path);
143 PropertyList_add(&_system_properties, _java_home);
144 PropertyList_add(&_system_properties, _java_class_path);
145 PropertyList_add(&_system_properties, _sun_boot_class_path);
146
147 // Set OS specific system properties values
148 os::init_system_properties_values();
149 }
150
151
152 // Update/Initialize System properties after JDK version number is known
153 void Arguments::init_version_specific_system_properties() {
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
155 JDK_Version::is_gte_jdk17x_version() ? "Oracle Corporation" : "Sun Microsystems Inc.", false));
156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
157 }
158
159 /**
160 * Provide a slightly more user-friendly way of eliminating -XX flags.
161 * When a flag is eliminated, it can be added to this list in order to
162 * continue accepting this flag on the command-line, while issuing a warning
163 * and ignoring the value. Once the JDK version reaches the 'accept_until'
164 * limit, we flatly refuse to admit the existence of the flag. This allows
165 * a flag to die correctly over JDK releases using HSX.
166 */
167 typedef struct {
168 const char* name;
169 JDK_Version obsoleted_in; // when the flag went away
170 JDK_Version accept_until; // which version to start denying the existence
171 } ObsoleteFlag;
172
173 static ObsoleteFlag obsolete_jvm_flags[] = {
174 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
184 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
185 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
186 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
187 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
188 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
189 { "DefaultInitialRAMFraction",
190 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
191 { "UseDepthFirstScavengeOrder",
192 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
193 { "HandlePromotionFailure",
194 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
195 { "MaxLiveObjectEvacuationRatio",
196 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
197 { NULL, JDK_Version(0), JDK_Version(0) }
198 };
199
200 // Returns true if the flag is obsolete and fits into the range specified
201 // for being ignored. In the case that the flag is ignored, the 'version'
202 // value is filled in with the version number when the flag became
203 // obsolete so that that value can be displayed to the user.
204 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
205 int i = 0;
206 assert(version != NULL, "Must provide a version buffer");
207 while (obsolete_jvm_flags[i].name != NULL) {
208 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
209 // <flag>=xxx form
210 // [-|+]<flag> form
211 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
212 ((s[0] == '+' || s[0] == '-') &&
213 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
214 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
215 *version = flag_status.obsoleted_in;
216 return true;
217 }
218 }
219 i++;
220 }
221 return false;
222 }
223
224 // Constructs the system class path (aka boot class path) from the following
225 // components, in order:
226 //
227 // prefix // from -Xbootclasspath/p:...
228 // endorsed // the expansion of -Djava.endorsed.dirs=...
229 // base // from os::get_system_properties() or -Xbootclasspath=
230 // suffix // from -Xbootclasspath/a:...
231 //
232 // java.endorsed.dirs is a list of directories; any jar or zip files in the
233 // directories are added to the sysclasspath just before the base.
234 //
235 // This could be AllStatic, but it isn't needed after argument processing is
236 // complete.
237 class SysClassPath: public StackObj {
238 public:
239 SysClassPath(const char* base);
240 ~SysClassPath();
241
242 inline void set_base(const char* base);
243 inline void add_prefix(const char* prefix);
244 inline void add_suffix_to_prefix(const char* suffix);
245 inline void add_suffix(const char* suffix);
246 inline void reset_path(const char* base);
247
248 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
249 // property. Must be called after all command-line arguments have been
250 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
251 // combined_path().
252 void expand_endorsed();
253
254 inline const char* get_base() const { return _items[_scp_base]; }
255 inline const char* get_prefix() const { return _items[_scp_prefix]; }
256 inline const char* get_suffix() const { return _items[_scp_suffix]; }
257 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
258
259 // Combine all the components into a single c-heap-allocated string; caller
260 // must free the string if/when no longer needed.
261 char* combined_path();
262
263 private:
264 // Utility routines.
265 static char* add_to_path(const char* path, const char* str, bool prepend);
266 static char* add_jars_to_path(char* path, const char* directory);
267
268 inline void reset_item_at(int index);
269
270 // Array indices for the items that make up the sysclasspath. All except the
271 // base are allocated in the C heap and freed by this class.
272 enum {
273 _scp_prefix, // from -Xbootclasspath/p:...
274 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
275 _scp_base, // the default sysclasspath
276 _scp_suffix, // from -Xbootclasspath/a:...
277 _scp_nitems // the number of items, must be last.
278 };
279
280 const char* _items[_scp_nitems];
281 DEBUG_ONLY(bool _expansion_done;)
282 };
283
284 SysClassPath::SysClassPath(const char* base) {
285 memset(_items, 0, sizeof(_items));
286 _items[_scp_base] = base;
287 DEBUG_ONLY(_expansion_done = false;)
288 }
289
290 SysClassPath::~SysClassPath() {
291 // Free everything except the base.
292 for (int i = 0; i < _scp_nitems; ++i) {
293 if (i != _scp_base) reset_item_at(i);
294 }
295 DEBUG_ONLY(_expansion_done = false;)
296 }
297
298 inline void SysClassPath::set_base(const char* base) {
299 _items[_scp_base] = base;
300 }
301
302 inline void SysClassPath::add_prefix(const char* prefix) {
303 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
304 }
305
306 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
307 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
308 }
309
310 inline void SysClassPath::add_suffix(const char* suffix) {
311 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
312 }
313
314 inline void SysClassPath::reset_item_at(int index) {
315 assert(index < _scp_nitems && index != _scp_base, "just checking");
316 if (_items[index] != NULL) {
317 FREE_C_HEAP_ARRAY(char, _items[index]);
318 _items[index] = NULL;
319 }
320 }
321
322 inline void SysClassPath::reset_path(const char* base) {
323 // Clear the prefix and suffix.
324 reset_item_at(_scp_prefix);
325 reset_item_at(_scp_suffix);
326 set_base(base);
327 }
328
329 //------------------------------------------------------------------------------
330
331 void SysClassPath::expand_endorsed() {
332 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
333
334 const char* path = Arguments::get_property("java.endorsed.dirs");
335 if (path == NULL) {
336 path = Arguments::get_endorsed_dir();
337 assert(path != NULL, "no default for java.endorsed.dirs");
338 }
339
340 char* expanded_path = NULL;
341 const char separator = *os::path_separator();
342 const char* const end = path + strlen(path);
343 while (path < end) {
344 const char* tmp_end = strchr(path, separator);
345 if (tmp_end == NULL) {
346 expanded_path = add_jars_to_path(expanded_path, path);
347 path = end;
348 } else {
349 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
350 memcpy(dirpath, path, tmp_end - path);
351 dirpath[tmp_end - path] = '\0';
352 expanded_path = add_jars_to_path(expanded_path, dirpath);
353 FREE_C_HEAP_ARRAY(char, dirpath);
354 path = tmp_end + 1;
355 }
356 }
357 _items[_scp_endorsed] = expanded_path;
358 DEBUG_ONLY(_expansion_done = true;)
359 }
360
361 // Combine the bootclasspath elements, some of which may be null, into a single
362 // c-heap-allocated string.
363 char* SysClassPath::combined_path() {
364 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
365 assert(_expansion_done, "must call expand_endorsed() first.");
366
367 size_t lengths[_scp_nitems];
368 size_t total_len = 0;
369
370 const char separator = *os::path_separator();
371
372 // Get the lengths.
373 int i;
374 for (i = 0; i < _scp_nitems; ++i) {
375 if (_items[i] != NULL) {
376 lengths[i] = strlen(_items[i]);
377 // Include space for the separator char (or a NULL for the last item).
378 total_len += lengths[i] + 1;
379 }
380 }
381 assert(total_len > 0, "empty sysclasspath not allowed");
382
383 // Copy the _items to a single string.
384 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
385 char* cp_tmp = cp;
386 for (i = 0; i < _scp_nitems; ++i) {
387 if (_items[i] != NULL) {
388 memcpy(cp_tmp, _items[i], lengths[i]);
389 cp_tmp += lengths[i];
390 *cp_tmp++ = separator;
391 }
392 }
393 *--cp_tmp = '\0'; // Replace the extra separator.
394 return cp;
395 }
396
397 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
398 char*
399 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
400 char *cp;
401
402 assert(str != NULL, "just checking");
403 if (path == NULL) {
404 size_t len = strlen(str) + 1;
405 cp = NEW_C_HEAP_ARRAY(char, len);
406 memcpy(cp, str, len); // copy the trailing null
407 } else {
408 const char separator = *os::path_separator();
409 size_t old_len = strlen(path);
410 size_t str_len = strlen(str);
411 size_t len = old_len + str_len + 2;
412
413 if (prepend) {
414 cp = NEW_C_HEAP_ARRAY(char, len);
415 char* cp_tmp = cp;
416 memcpy(cp_tmp, str, str_len);
417 cp_tmp += str_len;
418 *cp_tmp = separator;
419 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
420 FREE_C_HEAP_ARRAY(char, path);
421 } else {
422 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
423 char* cp_tmp = cp + old_len;
424 *cp_tmp = separator;
425 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
426 }
427 }
428 return cp;
429 }
430
431 // Scan the directory and append any jar or zip files found to path.
432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
433 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
434 DIR* dir = os::opendir(directory);
435 if (dir == NULL) return path;
436
437 char dir_sep[2] = { '\0', '\0' };
438 size_t directory_len = strlen(directory);
439 const char fileSep = *os::file_separator();
440 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
441
442 /* Scan the directory for jars/zips, appending them to path. */
443 struct dirent *entry;
444 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
445 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
446 const char* name = entry->d_name;
447 const char* ext = name + strlen(name) - 4;
448 bool isJarOrZip = ext > name &&
449 (os::file_name_strcmp(ext, ".jar") == 0 ||
450 os::file_name_strcmp(ext, ".zip") == 0);
451 if (isJarOrZip) {
452 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
453 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
454 path = add_to_path(path, jarpath, false);
455 FREE_C_HEAP_ARRAY(char, jarpath);
456 }
457 }
458 FREE_C_HEAP_ARRAY(char, dbuf);
459 os::closedir(dir);
460 return path;
461 }
462
463 // Parses a memory size specification string.
464 static bool atomull(const char *s, julong* result) {
465 julong n = 0;
466 int args_read = sscanf(s, os::julong_format_specifier(), &n);
467 if (args_read != 1) {
468 return false;
469 }
470 while (*s != '\0' && isdigit(*s)) {
471 s++;
472 }
473 // 4705540: illegal if more characters are found after the first non-digit
474 if (strlen(s) > 1) {
475 return false;
476 }
477 switch (*s) {
478 case 'T': case 't':
479 *result = n * G * K;
480 // Check for overflow.
481 if (*result/((julong)G * K) != n) return false;
482 return true;
483 case 'G': case 'g':
484 *result = n * G;
485 if (*result/G != n) return false;
486 return true;
487 case 'M': case 'm':
488 *result = n * M;
489 if (*result/M != n) return false;
490 return true;
491 case 'K': case 'k':
492 *result = n * K;
493 if (*result/K != n) return false;
494 return true;
495 case '\0':
496 *result = n;
497 return true;
498 default:
499 return false;
500 }
501 }
502
503 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
504 if (size < min_size) return arg_too_small;
505 // Check that size will fit in a size_t (only relevant on 32-bit)
506 if (size > max_uintx) return arg_too_big;
507 return arg_in_range;
508 }
509
510 // Describe an argument out of range error
511 void Arguments::describe_range_error(ArgsRange errcode) {
512 switch(errcode) {
513 case arg_too_big:
514 jio_fprintf(defaultStream::error_stream(),
515 "The specified size exceeds the maximum "
516 "representable size.\n");
517 break;
518 case arg_too_small:
519 case arg_unreadable:
520 case arg_in_range:
521 // do nothing for now
522 break;
523 default:
524 ShouldNotReachHere();
525 }
526 }
527
528 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
529 return CommandLineFlags::boolAtPut(name, &value, origin);
530 }
531
532 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
533 double v;
534 if (sscanf(value, "%lf", &v) != 1) {
535 return false;
536 }
537
538 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
539 return true;
540 }
541 return false;
542 }
543
544 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
545 julong v;
546 intx intx_v;
547 bool is_neg = false;
548 // Check the sign first since atomull() parses only unsigned values.
549 if (*value == '-') {
550 if (!CommandLineFlags::intxAt(name, &intx_v)) {
551 return false;
552 }
553 value++;
554 is_neg = true;
555 }
556 if (!atomull(value, &v)) {
557 return false;
558 }
559 intx_v = (intx) v;
560 if (is_neg) {
561 intx_v = -intx_v;
562 }
563 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
564 return true;
565 }
566 uintx uintx_v = (uintx) v;
567 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
568 return true;
569 }
570 uint64_t uint64_t_v = (uint64_t) v;
571 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
572 return true;
573 }
574 return false;
575 }
576
577 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
578 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
579 // Contract: CommandLineFlags always returns a pointer that needs freeing.
580 FREE_C_HEAP_ARRAY(char, value);
581 return true;
582 }
583
584 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
585 const char* old_value = "";
586 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
587 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
588 size_t new_len = strlen(new_value);
589 const char* value;
590 char* free_this_too = NULL;
591 if (old_len == 0) {
592 value = new_value;
593 } else if (new_len == 0) {
594 value = old_value;
595 } else {
596 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
597 // each new setting adds another LINE to the switch:
598 sprintf(buf, "%s\n%s", old_value, new_value);
599 value = buf;
600 free_this_too = buf;
601 }
602 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
603 // CommandLineFlags always returns a pointer that needs freeing.
604 FREE_C_HEAP_ARRAY(char, value);
605 if (free_this_too != NULL) {
606 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
607 FREE_C_HEAP_ARRAY(char, free_this_too);
608 }
609 return true;
610 }
611
612 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
613
614 // range of acceptable characters spelled out for portability reasons
615 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
616 #define BUFLEN 255
617 char name[BUFLEN+1];
618 char dummy;
619
620 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
621 return set_bool_flag(name, false, origin);
622 }
623 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
624 return set_bool_flag(name, true, origin);
625 }
626
627 char punct;
628 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
629 const char* value = strchr(arg, '=') + 1;
630 Flag* flag = Flag::find_flag(name, strlen(name));
631 if (flag != NULL && flag->is_ccstr()) {
632 if (flag->ccstr_accumulates()) {
633 return append_to_string_flag(name, value, origin);
634 } else {
635 if (value[0] == '\0') {
636 value = NULL;
637 }
638 return set_string_flag(name, value, origin);
639 }
640 }
641 }
642
643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
644 const char* value = strchr(arg, '=') + 1;
645 // -XX:Foo:=xxx will reset the string flag to the given value.
646 if (value[0] == '\0') {
647 value = NULL;
648 }
649 return set_string_flag(name, value, origin);
650 }
651
652 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
653 #define SIGNED_NUMBER_RANGE "[-0123456789]"
654 #define NUMBER_RANGE "[0123456789]"
655 char value[BUFLEN + 1];
656 char value2[BUFLEN + 1];
657 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
658 // Looks like a floating-point number -- try again with more lenient format string
659 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
660 return set_fp_numeric_flag(name, value, origin);
661 }
662 }
663
664 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
665 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
666 return set_numeric_flag(name, value, origin);
667 }
668
669 return false;
670 }
671
672 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
673 assert(bldarray != NULL, "illegal argument");
674
675 if (arg == NULL) {
676 return;
677 }
678
679 int index = *count;
680
681 // expand the array and add arg to the last element
682 (*count)++;
683 if (*bldarray == NULL) {
684 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
685 } else {
686 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
687 }
688 (*bldarray)[index] = strdup(arg);
689 }
690
691 void Arguments::build_jvm_args(const char* arg) {
692 add_string(&_jvm_args_array, &_num_jvm_args, arg);
693 }
694
695 void Arguments::build_jvm_flags(const char* arg) {
696 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
697 }
698
699 // utility function to return a string that concatenates all
700 // strings in a given char** array
701 const char* Arguments::build_resource_string(char** args, int count) {
702 if (args == NULL || count == 0) {
703 return NULL;
704 }
705 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
706 for (int i = 1; i < count; i++) {
707 length += strlen(args[i]) + 1; // add 1 for a space
708 }
709 char* s = NEW_RESOURCE_ARRAY(char, length);
710 strcpy(s, args[0]);
711 for (int j = 1; j < count; j++) {
712 strcat(s, " ");
713 strcat(s, args[j]);
714 }
715 return (const char*) s;
716 }
717
718 void Arguments::print_on(outputStream* st) {
719 st->print_cr("VM Arguments:");
720 if (num_jvm_flags() > 0) {
721 st->print("jvm_flags: "); print_jvm_flags_on(st);
722 }
723 if (num_jvm_args() > 0) {
724 st->print("jvm_args: "); print_jvm_args_on(st);
725 }
726 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
727 st->print_cr("Launcher Type: %s", _sun_java_launcher);
728 }
729
730 void Arguments::print_jvm_flags_on(outputStream* st) {
731 if (_num_jvm_flags > 0) {
732 for (int i=0; i < _num_jvm_flags; i++) {
733 st->print("%s ", _jvm_flags_array[i]);
734 }
735 st->print_cr("");
736 }
737 }
738
739 void Arguments::print_jvm_args_on(outputStream* st) {
740 if (_num_jvm_args > 0) {
741 for (int i=0; i < _num_jvm_args; i++) {
742 st->print("%s ", _jvm_args_array[i]);
743 }
744 st->print_cr("");
745 }
746 }
747
748 bool Arguments::process_argument(const char* arg,
749 jboolean ignore_unrecognized, FlagValueOrigin origin) {
750
751 JDK_Version since = JDK_Version();
752
753 if (parse_argument(arg, origin)) {
754 // do nothing
755 } else if (is_newly_obsolete(arg, &since)) {
756 enum { bufsize = 256 };
757 char buffer[bufsize];
758 since.to_string(buffer, bufsize);
759 jio_fprintf(defaultStream::error_stream(),
760 "Warning: The flag %s has been EOL'd as of %s and will"
761 " be ignored\n", arg, buffer);
762 } else {
763 if (!ignore_unrecognized) {
764 jio_fprintf(defaultStream::error_stream(),
765 "Unrecognized VM option '%s'\n", arg);
766 // allow for commandline "commenting out" options like -XX:#+Verbose
767 if (strlen(arg) == 0 || arg[0] != '#') {
768 return false;
769 }
770 }
771 }
772 return true;
773 }
774
775 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
776 FILE* stream = fopen(file_name, "rb");
777 if (stream == NULL) {
778 if (should_exist) {
779 jio_fprintf(defaultStream::error_stream(),
780 "Could not open settings file %s\n", file_name);
781 return false;
782 } else {
783 return true;
784 }
785 }
786
787 char token[1024];
788 int pos = 0;
789
790 bool in_white_space = true;
791 bool in_comment = false;
792 bool in_quote = false;
793 char quote_c = 0;
794 bool result = true;
795
796 int c = getc(stream);
797 while(c != EOF) {
798 if (in_white_space) {
799 if (in_comment) {
800 if (c == '\n') in_comment = false;
801 } else {
802 if (c == '#') in_comment = true;
803 else if (!isspace(c)) {
804 in_white_space = false;
805 token[pos++] = c;
806 }
807 }
808 } else {
809 if (c == '\n' || (!in_quote && isspace(c))) {
810 // token ends at newline, or at unquoted whitespace
811 // this allows a way to include spaces in string-valued options
812 token[pos] = '\0';
813 logOption(token);
814 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
815 build_jvm_flags(token);
816 pos = 0;
817 in_white_space = true;
818 in_quote = false;
819 } else if (!in_quote && (c == '\'' || c == '"')) {
820 in_quote = true;
821 quote_c = c;
822 } else if (in_quote && (c == quote_c)) {
823 in_quote = false;
824 } else {
825 token[pos++] = c;
826 }
827 }
828 c = getc(stream);
829 }
830 if (pos > 0) {
831 token[pos] = '\0';
832 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
833 build_jvm_flags(token);
834 }
835 fclose(stream);
836 return result;
837 }
838
839 //=============================================================================================================
840 // Parsing of properties (-D)
841
842 const char* Arguments::get_property(const char* key) {
843 return PropertyList_get_value(system_properties(), key);
844 }
845
846 bool Arguments::add_property(const char* prop) {
847 const char* eq = strchr(prop, '=');
848 char* key;
849 // ns must be static--its address may be stored in a SystemProperty object.
850 const static char ns[1] = {0};
851 char* value = (char *)ns;
852
853 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
854 key = AllocateHeap(key_len + 1, "add_property");
855 strncpy(key, prop, key_len);
856 key[key_len] = '\0';
857
858 if (eq != NULL) {
859 size_t value_len = strlen(prop) - key_len - 1;
860 value = AllocateHeap(value_len + 1, "add_property");
861 strncpy(value, &prop[key_len + 1], value_len + 1);
862 }
863
864 if (strcmp(key, "java.compiler") == 0) {
865 process_java_compiler_argument(value);
866 FreeHeap(key);
867 if (eq != NULL) {
868 FreeHeap(value);
869 }
870 return true;
871 } else if (strcmp(key, "sun.java.command") == 0) {
872 _java_command = value;
873
874 // don't add this property to the properties exposed to the java application
875 FreeHeap(key);
876 return true;
877 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
878 // launcher.pid property is private and is processed
879 // in process_sun_java_launcher_properties();
880 // the sun.java.launcher property is passed on to the java application
881 FreeHeap(key);
882 if (eq != NULL) {
883 FreeHeap(value);
884 }
885 return true;
886 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
887 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
888 // its value without going through the property list or making a Java call.
889 _java_vendor_url_bug = value;
890 } else if (strcmp(key, "sun.boot.library.path") == 0) {
891 PropertyList_unique_add(&_system_properties, key, value, true);
892 return true;
893 }
894 // Create new property and add at the end of the list
895 PropertyList_unique_add(&_system_properties, key, value);
896 return true;
897 }
898
899 //===========================================================================================================
900 // Setting int/mixed/comp mode flags
901
902 void Arguments::set_mode_flags(Mode mode) {
903 // Set up default values for all flags.
904 // If you add a flag to any of the branches below,
905 // add a default value for it here.
906 set_java_compiler(false);
907 _mode = mode;
908
909 // Ensure Agent_OnLoad has the correct initial values.
910 // This may not be the final mode; mode may change later in onload phase.
911 PropertyList_unique_add(&_system_properties, "java.vm.info",
912 (char*)Abstract_VM_Version::vm_info_string(), false);
913
914 UseInterpreter = true;
915 UseCompiler = true;
916 UseLoopCounter = true;
917
918 // Default values may be platform/compiler dependent -
919 // use the saved values
920 ClipInlining = Arguments::_ClipInlining;
921 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
922 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
923 BackgroundCompilation = Arguments::_BackgroundCompilation;
924
925 // Change from defaults based on mode
926 switch (mode) {
927 default:
928 ShouldNotReachHere();
929 break;
930 case _int:
931 UseCompiler = false;
932 UseLoopCounter = false;
933 AlwaysCompileLoopMethods = false;
934 UseOnStackReplacement = false;
935 break;
936 case _mixed:
937 // same as default
938 break;
939 case _comp:
940 UseInterpreter = false;
941 BackgroundCompilation = false;
942 ClipInlining = false;
943 break;
944 }
945 }
946
947 // Conflict: required to use shared spaces (-Xshare:on), but
948 // incompatible command line options were chosen.
949
950 static void no_shared_spaces() {
951 if (RequireSharedSpaces) {
952 jio_fprintf(defaultStream::error_stream(),
953 "Class data sharing is inconsistent with other specified options.\n");
954 vm_exit_during_initialization("Unable to use shared archive.", NULL);
955 } else {
956 FLAG_SET_DEFAULT(UseSharedSpaces, false);
957 }
958 }
959
960 void Arguments::check_compressed_oops_compat() {
961 #ifdef _LP64
962 assert(UseCompressedOops, "Precondition");
963 // Is it on by default or set on ergonomically
964 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
965
966 // If dumping an archive or forcing its use, disable compressed oops if possible
967 if (DumpSharedSpaces || RequireSharedSpaces) {
968 if (is_on_by_default) {
969 FLAG_SET_DEFAULT(UseCompressedOops, false);
970 return;
971 } else {
972 vm_exit_during_initialization(
973 "Class Data Sharing is not supported with compressed oops yet", NULL);
974 }
975 } else if (UseSharedSpaces) {
976 // UseSharedSpaces is on by default. With compressed oops, we turn it off.
977 FLAG_SET_DEFAULT(UseSharedSpaces, false);
978 }
979 #endif // _LP64
980 }
981
982 void Arguments::set_tiered_flags() {
983 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
984 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
985 }
986 if (CompilationPolicyChoice < 2) {
987 vm_exit_during_initialization(
988 "Incompatible compilation policy selected", NULL);
989 }
990 // Increase the code cache size - tiered compiles a lot more.
991 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
992 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
993 }
994 }
995
996 #ifndef KERNEL
997 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
998 // if it's not explictly set or unset. If the user has chosen
999 // UseParNewGC and not explicitly set ParallelGCThreads we
1000 // set it, unless this is a single cpu machine.
1001 void Arguments::set_parnew_gc_flags() {
1002 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1003 "control point invariant");
1004 assert(UseParNewGC, "Error");
1005
1006 // Turn off AdaptiveSizePolicy by default for parnew until it is
1007 // complete.
1008 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1009 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1010 }
1011
1012 if (ParallelGCThreads == 0) {
1013 FLAG_SET_DEFAULT(ParallelGCThreads,
1014 Abstract_VM_Version::parallel_worker_threads());
1015 if (ParallelGCThreads == 1) {
1016 FLAG_SET_DEFAULT(UseParNewGC, false);
1017 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1018 }
1019 }
1020 if (UseParNewGC) {
1021 // CDS doesn't work with ParNew yet
1022 no_shared_spaces();
1023
1024 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1025 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1026 // we set them to 1024 and 1024.
1027 // See CR 6362902.
1028 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1029 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1030 }
1031 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1032 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1033 }
1034
1035 // AlwaysTenure flag should make ParNew promote all at first collection.
1036 // See CR 6362902.
1037 if (AlwaysTenure) {
1038 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1039 }
1040 // When using compressed oops, we use local overflow stacks,
1041 // rather than using a global overflow list chained through
1042 // the klass word of the object's pre-image.
1043 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1044 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1045 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1046 }
1047 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1048 }
1049 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1050 }
1051 }
1052
1053 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1054 // sparc/solaris for certain applications, but would gain from
1055 // further optimization and tuning efforts, and would almost
1056 // certainly gain from analysis of platform and environment.
1057 void Arguments::set_cms_and_parnew_gc_flags() {
1058 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1059 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1060
1061 // If we are using CMS, we prefer to UseParNewGC,
1062 // unless explicitly forbidden.
1063 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1064 FLAG_SET_ERGO(bool, UseParNewGC, true);
1065 }
1066
1067 // Turn off AdaptiveSizePolicy by default for cms until it is
1068 // complete.
1069 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1070 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1071 }
1072
1073 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1074 // as needed.
1075 if (UseParNewGC) {
1076 set_parnew_gc_flags();
1077 }
1078
1079 // Now make adjustments for CMS
1080 size_t young_gen_per_worker;
1081 intx new_ratio;
1082 size_t min_new_default;
1083 intx tenuring_default;
1084 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1085 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1086 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1087 }
1088 young_gen_per_worker = 4*M;
1089 new_ratio = (intx)15;
1090 min_new_default = 4*M;
1091 tenuring_default = (intx)0;
1092 } else { // new defaults: "new" as of 6.0
1093 young_gen_per_worker = CMSYoungGenPerWorker;
1094 new_ratio = (intx)7;
1095 min_new_default = 16*M;
1096 tenuring_default = (intx)4;
1097 }
1098
1099 // Preferred young gen size for "short" pauses
1100 const uintx parallel_gc_threads =
1101 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1102 const size_t preferred_max_new_size_unaligned =
1103 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1104 const size_t preferred_max_new_size =
1105 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1106
1107 // Unless explicitly requested otherwise, size young gen
1108 // for "short" pauses ~ 4M*ParallelGCThreads
1109
1110 // If either MaxNewSize or NewRatio is set on the command line,
1111 // assume the user is trying to set the size of the young gen.
1112
1113 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1114
1115 // Set MaxNewSize to our calculated preferred_max_new_size unless
1116 // NewSize was set on the command line and it is larger than
1117 // preferred_max_new_size.
1118 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1119 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1120 } else {
1121 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1122 }
1123 if (PrintGCDetails && Verbose) {
1124 // Too early to use gclog_or_tty
1125 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1126 }
1127
1128 // Unless explicitly requested otherwise, prefer a large
1129 // Old to Young gen size so as to shift the collection load
1130 // to the old generation concurrent collector
1131
1132 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1133 // then NewSize and OldSize may be calculated. That would
1134 // generally lead to some differences with ParNewGC for which
1135 // there was no obvious reason. Also limit to the case where
1136 // MaxNewSize has not been set.
1137
1138 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1139
1140 // Code along this path potentially sets NewSize and OldSize
1141
1142 // Calculate the desired minimum size of the young gen but if
1143 // NewSize has been set on the command line, use it here since
1144 // it should be the final value.
1145 size_t min_new;
1146 if (FLAG_IS_DEFAULT(NewSize)) {
1147 min_new = align_size_up(ScaleForWordSize(min_new_default),
1148 os::vm_page_size());
1149 } else {
1150 min_new = NewSize;
1151 }
1152 size_t prev_initial_size = InitialHeapSize;
1153 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1154 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1155 // Currently minimum size and the initial heap sizes are the same.
1156 set_min_heap_size(InitialHeapSize);
1157 if (PrintGCDetails && Verbose) {
1158 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1159 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1160 InitialHeapSize/M, prev_initial_size/M);
1161 }
1162 }
1163
1164 // MaxHeapSize is aligned down in collectorPolicy
1165 size_t max_heap =
1166 align_size_down(MaxHeapSize,
1167 CardTableRS::ct_max_alignment_constraint());
1168
1169 if (PrintGCDetails && Verbose) {
1170 // Too early to use gclog_or_tty
1171 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1172 " initial_heap_size: " SIZE_FORMAT
1173 " max_heap: " SIZE_FORMAT,
1174 min_heap_size(), InitialHeapSize, max_heap);
1175 }
1176 if (max_heap > min_new) {
1177 // Unless explicitly requested otherwise, make young gen
1178 // at least min_new, and at most preferred_max_new_size.
1179 if (FLAG_IS_DEFAULT(NewSize)) {
1180 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1181 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1182 if (PrintGCDetails && Verbose) {
1183 // Too early to use gclog_or_tty
1184 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1185 }
1186 }
1187 // Unless explicitly requested otherwise, size old gen
1188 // so that it's at least 3X of NewSize to begin with;
1189 // later NewRatio will decide how it grows; see above.
1190 if (FLAG_IS_DEFAULT(OldSize)) {
1191 if (max_heap > NewSize) {
1192 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1193 if (PrintGCDetails && Verbose) {
1194 // Too early to use gclog_or_tty
1195 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1196 }
1197 }
1198 }
1199 }
1200 }
1201 // Unless explicitly requested otherwise, definitely
1202 // promote all objects surviving "tenuring_default" scavenges.
1203 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1204 FLAG_IS_DEFAULT(SurvivorRatio)) {
1205 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1206 }
1207 // If we decided above (or user explicitly requested)
1208 // `promote all' (via MaxTenuringThreshold := 0),
1209 // prefer minuscule survivor spaces so as not to waste
1210 // space for (non-existent) survivors
1211 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1212 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1213 }
1214 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1215 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1216 // This is done in order to make ParNew+CMS configuration to work
1217 // with YoungPLABSize and OldPLABSize options.
1218 // See CR 6362902.
1219 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1220 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1221 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1222 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1223 // the value (either from the command line or ergonomics) of
1224 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1225 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1226 } else {
1227 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1228 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1229 // we'll let it to take precedence.
1230 jio_fprintf(defaultStream::error_stream(),
1231 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1232 " options are specified for the CMS collector."
1233 " CMSParPromoteBlocksToClaim will take precedence.\n");
1234 }
1235 }
1236 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1237 // OldPLAB sizing manually turned off: Use a larger default setting,
1238 // unless it was manually specified. This is because a too-low value
1239 // will slow down scavenges.
1240 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1241 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1242 }
1243 }
1244 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1245 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1246 // If either of the static initialization defaults have changed, note this
1247 // modification.
1248 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1249 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1250 }
1251 if (PrintGCDetails && Verbose) {
1252 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1253 MarkStackSize / K, MarkStackSizeMax / K);
1254 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1255 }
1256 }
1257 #endif // KERNEL
1258
1259 void set_object_alignment() {
1260 // Object alignment.
1261 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1262 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1263 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1264 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1265 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1266 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1267
1268 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1269 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1270
1271 // Oop encoding heap max
1272 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1273
1274 #ifndef KERNEL
1275 // Set CMS global values
1276 CompactibleFreeListSpace::set_cms_values();
1277 #endif // KERNEL
1278 }
1279
1280 bool verify_object_alignment() {
1281 // Object alignment.
1282 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1283 jio_fprintf(defaultStream::error_stream(),
1284 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1285 (int)ObjectAlignmentInBytes);
1286 return false;
1287 }
1288 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1291 (int)ObjectAlignmentInBytes, BytesPerLong);
1292 return false;
1293 }
1294 // It does not make sense to have big object alignment
1295 // since a space lost due to alignment will be greater
1296 // then a saved space from compressed oops.
1297 if ((int)ObjectAlignmentInBytes > 256) {
1298 jio_fprintf(defaultStream::error_stream(),
1299 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1300 (int)ObjectAlignmentInBytes);
1301 return false;
1302 }
1303 // In case page size is very small.
1304 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1305 jio_fprintf(defaultStream::error_stream(),
1306 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1307 (int)ObjectAlignmentInBytes, os::vm_page_size());
1308 return false;
1309 }
1310 return true;
1311 }
1312
1313 inline uintx max_heap_for_compressed_oops() {
1314 // Avoid sign flip.
1315 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1316 return 0;
1317 }
1318 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1319 NOT_LP64(ShouldNotReachHere(); return 0);
1320 }
1321
1322 bool Arguments::should_auto_select_low_pause_collector() {
1323 if (UseAutoGCSelectPolicy &&
1324 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1325 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1326 if (PrintGCDetails) {
1327 // Cannot use gclog_or_tty yet.
1328 tty->print_cr("Automatic selection of the low pause collector"
1329 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1330 }
1331 return true;
1332 }
1333 return false;
1334 }
1335
1336 void Arguments::set_ergonomics_flags() {
1337 // Parallel GC is not compatible with sharing. If one specifies
1338 // that they want sharing explicitly, do not set ergonomics flags.
1339 if (DumpSharedSpaces || ForceSharedSpaces) {
1340 return;
1341 }
1342
1343 if (os::is_server_class_machine() && !force_client_mode ) {
1344 // If no other collector is requested explicitly,
1345 // let the VM select the collector based on
1346 // machine class and automatic selection policy.
1347 if (!UseSerialGC &&
1348 !UseConcMarkSweepGC &&
1349 !UseG1GC &&
1350 !UseParNewGC &&
1351 !DumpSharedSpaces &&
1352 FLAG_IS_DEFAULT(UseParallelGC)) {
1353 if (should_auto_select_low_pause_collector()) {
1354 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1355 } else {
1356 FLAG_SET_ERGO(bool, UseParallelGC, true);
1357 }
1358 no_shared_spaces();
1359 }
1360 }
1361
1362 #ifndef ZERO
1363 #ifdef _LP64
1364 // Check that UseCompressedOops can be set with the max heap size allocated
1365 // by ergonomics.
1366 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1367 #if !defined(COMPILER1) || defined(TIERED)
1368 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1369 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1370 }
1371 #endif
1372 #ifdef _WIN64
1373 if (UseLargePages && UseCompressedOops) {
1374 // Cannot allocate guard pages for implicit checks in indexed addressing
1375 // mode, when large pages are specified on windows.
1376 // This flag could be switched ON if narrow oop base address is set to 0,
1377 // see code in Universe::initialize_heap().
1378 Universe::set_narrow_oop_use_implicit_null_checks(false);
1379 }
1380 #endif // _WIN64
1381 } else {
1382 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1383 warning("Max heap size too large for Compressed Oops");
1384 FLAG_SET_DEFAULT(UseCompressedOops, false);
1385 }
1386 }
1387 // Also checks that certain machines are slower with compressed oops
1388 // in vm_version initialization code.
1389 #endif // _LP64
1390 #endif // !ZERO
1391 }
1392
1393 void Arguments::set_parallel_gc_flags() {
1394 assert(UseParallelGC || UseParallelOldGC, "Error");
1395 // If parallel old was requested, automatically enable parallel scavenge.
1396 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1397 FLAG_SET_DEFAULT(UseParallelGC, true);
1398 }
1399
1400 // If no heap maximum was requested explicitly, use some reasonable fraction
1401 // of the physical memory, up to a maximum of 1GB.
1402 if (UseParallelGC) {
1403 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1404 Abstract_VM_Version::parallel_worker_threads());
1405
1406 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1407 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1408 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1409 // See CR 6362902 for details.
1410 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1411 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1412 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1413 }
1414 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1415 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1416 }
1417 }
1418
1419 if (UseParallelOldGC) {
1420 // Par compact uses lower default values since they are treated as
1421 // minimums. These are different defaults because of the different
1422 // interpretation and are not ergonomically set.
1423 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1424 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1425 }
1426 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1427 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1428 }
1429 }
1430 }
1431 }
1432
1433 void Arguments::set_g1_gc_flags() {
1434 assert(UseG1GC, "Error");
1435 #ifdef COMPILER1
1436 FastTLABRefill = false;
1437 #endif
1438 FLAG_SET_DEFAULT(ParallelGCThreads,
1439 Abstract_VM_Version::parallel_worker_threads());
1440 if (ParallelGCThreads == 0) {
1441 FLAG_SET_DEFAULT(ParallelGCThreads,
1442 Abstract_VM_Version::parallel_worker_threads());
1443 }
1444 no_shared_spaces();
1445
1446 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1447 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1448 }
1449 if (PrintGCDetails && Verbose) {
1450 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1451 MarkStackSize / K, MarkStackSizeMax / K);
1452 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1453 }
1454
1455 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1456 // In G1, we want the default GC overhead goal to be higher than
1457 // say in PS. So we set it here to 10%. Otherwise the heap might
1458 // be expanded more aggressively than we would like it to. In
1459 // fact, even 10% seems to not be high enough in some cases
1460 // (especially small GC stress tests that the main thing they do
1461 // is allocation). We might consider increase it further.
1462 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1463 }
1464 }
1465
1466 void Arguments::set_heap_size() {
1467 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1468 // Deprecated flag
1469 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1470 }
1471
1472 const julong phys_mem =
1473 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1474 : (julong)MaxRAM;
1475
1476 // If the maximum heap size has not been set with -Xmx,
1477 // then set it as fraction of the size of physical memory,
1478 // respecting the maximum and minimum sizes of the heap.
1479 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1480 julong reasonable_max = phys_mem / MaxRAMFraction;
1481
1482 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1483 // Small physical memory, so use a minimum fraction of it for the heap
1484 reasonable_max = phys_mem / MinRAMFraction;
1485 } else {
1486 // Not-small physical memory, so require a heap at least
1487 // as large as MaxHeapSize
1488 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1489 }
1490 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1491 // Limit the heap size to ErgoHeapSizeLimit
1492 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1493 }
1494 if (UseCompressedOops) {
1495 // Limit the heap size to the maximum possible when using compressed oops
1496 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1497 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1498 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1499 // but it should be not less than default MaxHeapSize.
1500 max_coop_heap -= HeapBaseMinAddress;
1501 }
1502 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1503 }
1504 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1505
1506 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1507 // An initial heap size was specified on the command line,
1508 // so be sure that the maximum size is consistent. Done
1509 // after call to allocatable_physical_memory because that
1510 // method might reduce the allocation size.
1511 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1512 }
1513
1514 if (PrintGCDetails && Verbose) {
1515 // Cannot use gclog_or_tty yet.
1516 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1517 }
1518 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1519 }
1520
1521 // If the initial_heap_size has not been set with InitialHeapSize
1522 // or -Xms, then set it as fraction of the size of physical memory,
1523 // respecting the maximum and minimum sizes of the heap.
1524 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1525 julong reasonable_minimum = (julong)(OldSize + NewSize);
1526
1527 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1528
1529 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1530
1531 julong reasonable_initial = phys_mem / InitialRAMFraction;
1532
1533 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1534 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1535
1536 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1537
1538 if (PrintGCDetails && Verbose) {
1539 // Cannot use gclog_or_tty yet.
1540 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1541 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1542 }
1543 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1544 set_min_heap_size((uintx)reasonable_minimum);
1545 }
1546 }
1547
1548 // This must be called after ergonomics because we want bytecode rewriting
1549 // if the server compiler is used, or if UseSharedSpaces is disabled.
1550 void Arguments::set_bytecode_flags() {
1551 // Better not attempt to store into a read-only space.
1552 if (UseSharedSpaces) {
1553 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1554 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1555 }
1556
1557 if (!RewriteBytecodes) {
1558 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1559 }
1560 }
1561
1562 // Aggressive optimization flags -XX:+AggressiveOpts
1563 void Arguments::set_aggressive_opts_flags() {
1564 #ifdef COMPILER2
1565 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1566 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1567 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1568 }
1569 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1570 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1571 }
1572
1573 // Feed the cache size setting into the JDK
1574 char buffer[1024];
1575 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1576 add_property(buffer);
1577 }
1578 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1579 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1580 }
1581 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1582 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1583 }
1584 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1585 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1586 }
1587 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1588 FLAG_SET_DEFAULT(OptimizeFill, true);
1589 }
1590 #endif
1591
1592 if (AggressiveOpts) {
1593 // Sample flag setting code
1594 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1595 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1596 // }
1597 }
1598 }
1599
1600 //===========================================================================================================
1601 // Parsing of java.compiler property
1602
1603 void Arguments::process_java_compiler_argument(char* arg) {
1604 // For backwards compatibility, Djava.compiler=NONE or ""
1605 // causes us to switch to -Xint mode UNLESS -Xdebug
1606 // is also specified.
1607 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1608 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1609 }
1610 }
1611
1612 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1613 _sun_java_launcher = strdup(launcher);
1614 }
1615
1616 bool Arguments::created_by_java_launcher() {
1617 assert(_sun_java_launcher != NULL, "property must have value");
1618 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1619 }
1620
1621 //===========================================================================================================
1622 // Parsing of main arguments
1623
1624 bool Arguments::verify_interval(uintx val, uintx min,
1625 uintx max, const char* name) {
1626 // Returns true iff value is in the inclusive interval [min..max]
1627 // false, otherwise.
1628 if (val >= min && val <= max) {
1629 return true;
1630 }
1631 jio_fprintf(defaultStream::error_stream(),
1632 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1633 " and " UINTX_FORMAT "\n",
1634 name, val, min, max);
1635 return false;
1636 }
1637
1638 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1639 // Returns true if given value is greater than specified min threshold
1640 // false, otherwise.
1641 if (val >= min ) {
1642 return true;
1643 }
1644 jio_fprintf(defaultStream::error_stream(),
1645 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1646 name, val, min);
1647 return false;
1648 }
1649
1650 bool Arguments::verify_percentage(uintx value, const char* name) {
1651 if (value <= 100) {
1652 return true;
1653 }
1654 jio_fprintf(defaultStream::error_stream(),
1655 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1656 name, value);
1657 return false;
1658 }
1659
1660 static void force_serial_gc() {
1661 FLAG_SET_DEFAULT(UseSerialGC, true);
1662 FLAG_SET_DEFAULT(UseParNewGC, false);
1663 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1664 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1665 FLAG_SET_DEFAULT(UseParallelGC, false);
1666 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1667 FLAG_SET_DEFAULT(UseG1GC, false);
1668 }
1669
1670 static bool verify_serial_gc_flags() {
1671 return (UseSerialGC &&
1672 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1673 UseParallelGC || UseParallelOldGC));
1674 }
1675
1676 // Check consistency of GC selection
1677 bool Arguments::check_gc_consistency() {
1678 bool status = true;
1679 // Ensure that the user has not selected conflicting sets
1680 // of collectors. [Note: this check is merely a user convenience;
1681 // collectors over-ride each other so that only a non-conflicting
1682 // set is selected; however what the user gets is not what they
1683 // may have expected from the combination they asked for. It's
1684 // better to reduce user confusion by not allowing them to
1685 // select conflicting combinations.
1686 uint i = 0;
1687 if (UseSerialGC) i++;
1688 if (UseConcMarkSweepGC || UseParNewGC) i++;
1689 if (UseParallelGC || UseParallelOldGC) i++;
1690 if (UseG1GC) i++;
1691 if (i > 1) {
1692 jio_fprintf(defaultStream::error_stream(),
1693 "Conflicting collector combinations in option list; "
1694 "please refer to the release notes for the combinations "
1695 "allowed\n");
1696 status = false;
1697 }
1698
1699 return status;
1700 }
1701
1702 // Check stack pages settings
1703 bool Arguments::check_stack_pages()
1704 {
1705 bool status = true;
1706 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1707 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1708 // greater stack shadow pages can't generate instruction to bang stack
1709 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1710 return status;
1711 }
1712
1713 // Check the consistency of vm_init_args
1714 bool Arguments::check_vm_args_consistency() {
1715 // Method for adding checks for flag consistency.
1716 // The intent is to warn the user of all possible conflicts,
1717 // before returning an error.
1718 // Note: Needs platform-dependent factoring.
1719 bool status = true;
1720
1721 #if ( (defined(COMPILER2) && defined(SPARC)))
1722 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1723 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1724 // x86. Normally, VM_Version_init must be called from init_globals in
1725 // init.cpp, which is called by the initial java thread *after* arguments
1726 // have been parsed. VM_Version_init gets called twice on sparc.
1727 extern void VM_Version_init();
1728 VM_Version_init();
1729 if (!VM_Version::has_v9()) {
1730 jio_fprintf(defaultStream::error_stream(),
1731 "V8 Machine detected, Server requires V9\n");
1732 status = false;
1733 }
1734 #endif /* COMPILER2 && SPARC */
1735
1736 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1737 // builds so the cost of stack banging can be measured.
1738 #if (defined(PRODUCT) && defined(SOLARIS))
1739 if (!UseBoundThreads && !UseStackBanging) {
1740 jio_fprintf(defaultStream::error_stream(),
1741 "-UseStackBanging conflicts with -UseBoundThreads\n");
1742
1743 status = false;
1744 }
1745 #endif
1746
1747 if (TLABRefillWasteFraction == 0) {
1748 jio_fprintf(defaultStream::error_stream(),
1749 "TLABRefillWasteFraction should be a denominator, "
1750 "not " SIZE_FORMAT "\n",
1751 TLABRefillWasteFraction);
1752 status = false;
1753 }
1754
1755 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1756 "AdaptiveSizePolicyWeight");
1757 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1758 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1759 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1760 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1761
1762 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1763 jio_fprintf(defaultStream::error_stream(),
1764 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1765 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1766 MinHeapFreeRatio, MaxHeapFreeRatio);
1767 status = false;
1768 }
1769 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1770 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1771
1772 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1773 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1774 }
1775
1776 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1777 // Settings to encourage splitting.
1778 if (!FLAG_IS_CMDLINE(NewRatio)) {
1779 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1780 }
1781 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1782 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1783 }
1784 }
1785
1786 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1787 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1788 if (GCTimeLimit == 100) {
1789 // Turn off gc-overhead-limit-exceeded checks
1790 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1791 }
1792
1793 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1794
1795 // Check whether user-specified sharing option conflicts with GC or page size.
1796 // Both sharing and large pages are enabled by default on some platforms;
1797 // large pages override sharing only if explicitly set on the command line.
1798 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1799 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1800 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1801 if (cannot_share) {
1802 // Either force sharing on by forcing the other options off, or
1803 // force sharing off.
1804 if (DumpSharedSpaces || ForceSharedSpaces) {
1805 jio_fprintf(defaultStream::error_stream(),
1806 "Using Serial GC and default page size because of %s\n",
1807 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1808 force_serial_gc();
1809 FLAG_SET_DEFAULT(UseLargePages, false);
1810 } else {
1811 if (UseSharedSpaces && Verbose) {
1812 jio_fprintf(defaultStream::error_stream(),
1813 "Turning off use of shared archive because of "
1814 "choice of garbage collector or large pages\n");
1815 }
1816 no_shared_spaces();
1817 }
1818 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1819 FLAG_SET_DEFAULT(UseLargePages, false);
1820 }
1821
1822 status = status && check_gc_consistency();
1823 status = status && check_stack_pages();
1824
1825 if (_has_alloc_profile) {
1826 if (UseParallelGC || UseParallelOldGC) {
1827 jio_fprintf(defaultStream::error_stream(),
1828 "error: invalid argument combination.\n"
1829 "Allocation profiling (-Xaprof) cannot be used together with "
1830 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1831 status = false;
1832 }
1833 if (UseConcMarkSweepGC) {
1834 jio_fprintf(defaultStream::error_stream(),
1835 "error: invalid argument combination.\n"
1836 "Allocation profiling (-Xaprof) cannot be used together with "
1837 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1838 status = false;
1839 }
1840 }
1841
1842 if (CMSIncrementalMode) {
1843 if (!UseConcMarkSweepGC) {
1844 jio_fprintf(defaultStream::error_stream(),
1845 "error: invalid argument combination.\n"
1846 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1847 "selected in order\nto use CMSIncrementalMode.\n");
1848 status = false;
1849 } else {
1850 status = status && verify_percentage(CMSIncrementalDutyCycle,
1851 "CMSIncrementalDutyCycle");
1852 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1853 "CMSIncrementalDutyCycleMin");
1854 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1855 "CMSIncrementalSafetyFactor");
1856 status = status && verify_percentage(CMSIncrementalOffset,
1857 "CMSIncrementalOffset");
1858 status = status && verify_percentage(CMSExpAvgFactor,
1859 "CMSExpAvgFactor");
1860 // If it was not set on the command line, set
1861 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1862 if (CMSInitiatingOccupancyFraction < 0) {
1863 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1864 }
1865 }
1866 }
1867
1868 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1869 // insists that we hold the requisite locks so that the iteration is
1870 // MT-safe. For the verification at start-up and shut-down, we don't
1871 // yet have a good way of acquiring and releasing these locks,
1872 // which are not visible at the CollectedHeap level. We want to
1873 // be able to acquire these locks and then do the iteration rather
1874 // than just disable the lock verification. This will be fixed under
1875 // bug 4788986.
1876 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1877 if (VerifyGCStartAt == 0) {
1878 warning("Heap verification at start-up disabled "
1879 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1880 VerifyGCStartAt = 1; // Disable verification at start-up
1881 }
1882 if (VerifyBeforeExit) {
1883 warning("Heap verification at shutdown disabled "
1884 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1885 VerifyBeforeExit = false; // Disable verification at shutdown
1886 }
1887 }
1888
1889 // Note: only executed in non-PRODUCT mode
1890 if (!UseAsyncConcMarkSweepGC &&
1891 (ExplicitGCInvokesConcurrent ||
1892 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1893 jio_fprintf(defaultStream::error_stream(),
1894 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1895 " with -UseAsyncConcMarkSweepGC");
1896 status = false;
1897 }
1898
1899 if (UseG1GC) {
1900 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1901 "InitiatingHeapOccupancyPercent");
1902 }
1903
1904 status = status && verify_interval(RefDiscoveryPolicy,
1905 ReferenceProcessor::DiscoveryPolicyMin,
1906 ReferenceProcessor::DiscoveryPolicyMax,
1907 "RefDiscoveryPolicy");
1908
1909 // Limit the lower bound of this flag to 1 as it is used in a division
1910 // expression.
1911 status = status && verify_interval(TLABWasteTargetPercent,
1912 1, 100, "TLABWasteTargetPercent");
1913
1914 status = status && verify_object_alignment();
1915
1916 return status;
1917 }
1918
1919 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1920 const char* option_type) {
1921 if (ignore) return false;
1922
1923 const char* spacer = " ";
1924 if (option_type == NULL) {
1925 option_type = ++spacer; // Set both to the empty string.
1926 }
1927
1928 if (os::obsolete_option(option)) {
1929 jio_fprintf(defaultStream::error_stream(),
1930 "Obsolete %s%soption: %s\n", option_type, spacer,
1931 option->optionString);
1932 return false;
1933 } else {
1934 jio_fprintf(defaultStream::error_stream(),
1935 "Unrecognized %s%soption: %s\n", option_type, spacer,
1936 option->optionString);
1937 return true;
1938 }
1939 }
1940
1941 static const char* user_assertion_options[] = {
1942 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1943 };
1944
1945 static const char* system_assertion_options[] = {
1946 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1947 };
1948
1949 // Return true if any of the strings in null-terminated array 'names' matches.
1950 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1951 // the option must match exactly.
1952 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1953 bool tail_allowed) {
1954 for (/* empty */; *names != NULL; ++names) {
1955 if (match_option(option, *names, tail)) {
1956 if (**tail == '\0' || tail_allowed && **tail == ':') {
1957 return true;
1958 }
1959 }
1960 }
1961 return false;
1962 }
1963
1964 bool Arguments::parse_uintx(const char* value,
1965 uintx* uintx_arg,
1966 uintx min_size) {
1967
1968 // Check the sign first since atomull() parses only unsigned values.
1969 bool value_is_positive = !(*value == '-');
1970
1971 if (value_is_positive) {
1972 julong n;
1973 bool good_return = atomull(value, &n);
1974 if (good_return) {
1975 bool above_minimum = n >= min_size;
1976 bool value_is_too_large = n > max_uintx;
1977
1978 if (above_minimum && !value_is_too_large) {
1979 *uintx_arg = n;
1980 return true;
1981 }
1982 }
1983 }
1984 return false;
1985 }
1986
1987 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1988 julong* long_arg,
1989 julong min_size) {
1990 if (!atomull(s, long_arg)) return arg_unreadable;
1991 return check_memory_size(*long_arg, min_size);
1992 }
1993
1994 // Parse JavaVMInitArgs structure
1995
1996 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1997 // For components of the system classpath.
1998 SysClassPath scp(Arguments::get_sysclasspath());
1999 bool scp_assembly_required = false;
2000
2001 // Save default settings for some mode flags
2002 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2003 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2004 Arguments::_ClipInlining = ClipInlining;
2005 Arguments::_BackgroundCompilation = BackgroundCompilation;
2006
2007 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2008 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2009 if (result != JNI_OK) {
2010 return result;
2011 }
2012
2013 // Parse JavaVMInitArgs structure passed in
2014 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2015 if (result != JNI_OK) {
2016 return result;
2017 }
2018
2019 if (AggressiveOpts) {
2020 // Insert alt-rt.jar between user-specified bootclasspath
2021 // prefix and the default bootclasspath. os::set_boot_path()
2022 // uses meta_index_dir as the default bootclasspath directory.
2023 const char* altclasses_jar = "alt-rt.jar";
2024 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2025 strlen(altclasses_jar);
2026 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2027 strcpy(altclasses_path, get_meta_index_dir());
2028 strcat(altclasses_path, altclasses_jar);
2029 scp.add_suffix_to_prefix(altclasses_path);
2030 scp_assembly_required = true;
2031 FREE_C_HEAP_ARRAY(char, altclasses_path);
2032 }
2033
2034 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2035 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2036 if (result != JNI_OK) {
2037 return result;
2038 }
2039
2040 // Do final processing now that all arguments have been parsed
2041 result = finalize_vm_init_args(&scp, scp_assembly_required);
2042 if (result != JNI_OK) {
2043 return result;
2044 }
2045
2046 return JNI_OK;
2047 }
2048
2049 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2050 SysClassPath* scp_p,
2051 bool* scp_assembly_required_p,
2052 FlagValueOrigin origin) {
2053 // Remaining part of option string
2054 const char* tail;
2055
2056 // iterate over arguments
2057 for (int index = 0; index < args->nOptions; index++) {
2058 bool is_absolute_path = false; // for -agentpath vs -agentlib
2059
2060 const JavaVMOption* option = args->options + index;
2061
2062 if (!match_option(option, "-Djava.class.path", &tail) &&
2063 !match_option(option, "-Dsun.java.command", &tail) &&
2064 !match_option(option, "-Dsun.java.launcher", &tail)) {
2065
2066 // add all jvm options to the jvm_args string. This string
2067 // is used later to set the java.vm.args PerfData string constant.
2068 // the -Djava.class.path and the -Dsun.java.command options are
2069 // omitted from jvm_args string as each have their own PerfData
2070 // string constant object.
2071 build_jvm_args(option->optionString);
2072 }
2073
2074 // -verbose:[class/gc/jni]
2075 if (match_option(option, "-verbose", &tail)) {
2076 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2077 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2078 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2079 } else if (!strcmp(tail, ":gc")) {
2080 FLAG_SET_CMDLINE(bool, PrintGC, true);
2081 } else if (!strcmp(tail, ":jni")) {
2082 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2083 }
2084 // -da / -ea / -disableassertions / -enableassertions
2085 // These accept an optional class/package name separated by a colon, e.g.,
2086 // -da:java.lang.Thread.
2087 } else if (match_option(option, user_assertion_options, &tail, true)) {
2088 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2089 if (*tail == '\0') {
2090 JavaAssertions::setUserClassDefault(enable);
2091 } else {
2092 assert(*tail == ':', "bogus match by match_option()");
2093 JavaAssertions::addOption(tail + 1, enable);
2094 }
2095 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2096 } else if (match_option(option, system_assertion_options, &tail, false)) {
2097 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2098 JavaAssertions::setSystemClassDefault(enable);
2099 // -bootclasspath:
2100 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2101 scp_p->reset_path(tail);
2102 *scp_assembly_required_p = true;
2103 // -bootclasspath/a:
2104 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2105 scp_p->add_suffix(tail);
2106 *scp_assembly_required_p = true;
2107 // -bootclasspath/p:
2108 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2109 scp_p->add_prefix(tail);
2110 *scp_assembly_required_p = true;
2111 // -Xrun
2112 } else if (match_option(option, "-Xrun", &tail)) {
2113 if (tail != NULL) {
2114 const char* pos = strchr(tail, ':');
2115 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2116 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2117 name[len] = '\0';
2118
2119 char *options = NULL;
2120 if(pos != NULL) {
2121 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2122 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2123 }
2124 #ifdef JVMTI_KERNEL
2125 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2126 warning("profiling and debugging agents are not supported with Kernel VM");
2127 } else
2128 #endif // JVMTI_KERNEL
2129 add_init_library(name, options);
2130 }
2131 // -agentlib and -agentpath
2132 } else if (match_option(option, "-agentlib:", &tail) ||
2133 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2134 if(tail != NULL) {
2135 const char* pos = strchr(tail, '=');
2136 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2137 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2138 name[len] = '\0';
2139
2140 char *options = NULL;
2141 if(pos != NULL) {
2142 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2143 }
2144 #ifdef JVMTI_KERNEL
2145 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2146 warning("profiling and debugging agents are not supported with Kernel VM");
2147 } else
2148 #endif // JVMTI_KERNEL
2149 add_init_agent(name, options, is_absolute_path);
2150
2151 }
2152 // -javaagent
2153 } else if (match_option(option, "-javaagent:", &tail)) {
2154 if(tail != NULL) {
2155 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2156 add_init_agent("instrument", options, false);
2157 }
2158 // -Xnoclassgc
2159 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2160 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2161 // -Xincgc: i-CMS
2162 } else if (match_option(option, "-Xincgc", &tail)) {
2163 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2164 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2165 // -Xnoincgc: no i-CMS
2166 } else if (match_option(option, "-Xnoincgc", &tail)) {
2167 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2168 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2169 // -Xconcgc
2170 } else if (match_option(option, "-Xconcgc", &tail)) {
2171 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2172 // -Xnoconcgc
2173 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2174 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2175 // -Xbatch
2176 } else if (match_option(option, "-Xbatch", &tail)) {
2177 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2178 // -Xmn for compatibility with other JVM vendors
2179 } else if (match_option(option, "-Xmn", &tail)) {
2180 julong long_initial_eden_size = 0;
2181 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2182 if (errcode != arg_in_range) {
2183 jio_fprintf(defaultStream::error_stream(),
2184 "Invalid initial eden size: %s\n", option->optionString);
2185 describe_range_error(errcode);
2186 return JNI_EINVAL;
2187 }
2188 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2189 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2190 // -Xms
2191 } else if (match_option(option, "-Xms", &tail)) {
2192 julong long_initial_heap_size = 0;
2193 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2194 if (errcode != arg_in_range) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "Invalid initial heap size: %s\n", option->optionString);
2197 describe_range_error(errcode);
2198 return JNI_EINVAL;
2199 }
2200 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2201 // Currently the minimum size and the initial heap sizes are the same.
2202 set_min_heap_size(InitialHeapSize);
2203 // -Xmx
2204 } else if (match_option(option, "-Xmx", &tail)) {
2205 julong long_max_heap_size = 0;
2206 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2207 if (errcode != arg_in_range) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "Invalid maximum heap size: %s\n", option->optionString);
2210 describe_range_error(errcode);
2211 return JNI_EINVAL;
2212 }
2213 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2214 // Xmaxf
2215 } else if (match_option(option, "-Xmaxf", &tail)) {
2216 int maxf = (int)(atof(tail) * 100);
2217 if (maxf < 0 || maxf > 100) {
2218 jio_fprintf(defaultStream::error_stream(),
2219 "Bad max heap free percentage size: %s\n",
2220 option->optionString);
2221 return JNI_EINVAL;
2222 } else {
2223 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2224 }
2225 // Xminf
2226 } else if (match_option(option, "-Xminf", &tail)) {
2227 int minf = (int)(atof(tail) * 100);
2228 if (minf < 0 || minf > 100) {
2229 jio_fprintf(defaultStream::error_stream(),
2230 "Bad min heap free percentage size: %s\n",
2231 option->optionString);
2232 return JNI_EINVAL;
2233 } else {
2234 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2235 }
2236 // -Xss
2237 } else if (match_option(option, "-Xss", &tail)) {
2238 julong long_ThreadStackSize = 0;
2239 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2240 if (errcode != arg_in_range) {
2241 jio_fprintf(defaultStream::error_stream(),
2242 "Invalid thread stack size: %s\n", option->optionString);
2243 describe_range_error(errcode);
2244 return JNI_EINVAL;
2245 }
2246 // Internally track ThreadStackSize in units of 1024 bytes.
2247 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2248 round_to((int)long_ThreadStackSize, K) / K);
2249 // -Xoss
2250 } else if (match_option(option, "-Xoss", &tail)) {
2251 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2252 // -Xmaxjitcodesize
2253 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2254 julong long_ReservedCodeCacheSize = 0;
2255 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2256 (size_t)InitialCodeCacheSize);
2257 if (errcode != arg_in_range) {
2258 jio_fprintf(defaultStream::error_stream(),
2259 "Invalid maximum code cache size: %s\n",
2260 option->optionString);
2261 describe_range_error(errcode);
2262 return JNI_EINVAL;
2263 }
2264 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2265 // -green
2266 } else if (match_option(option, "-green", &tail)) {
2267 jio_fprintf(defaultStream::error_stream(),
2268 "Green threads support not available\n");
2269 return JNI_EINVAL;
2270 // -native
2271 } else if (match_option(option, "-native", &tail)) {
2272 // HotSpot always uses native threads, ignore silently for compatibility
2273 // -Xsqnopause
2274 } else if (match_option(option, "-Xsqnopause", &tail)) {
2275 // EVM option, ignore silently for compatibility
2276 // -Xrs
2277 } else if (match_option(option, "-Xrs", &tail)) {
2278 // Classic/EVM option, new functionality
2279 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2280 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2281 // change default internal VM signals used - lower case for back compat
2282 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2283 // -Xoptimize
2284 } else if (match_option(option, "-Xoptimize", &tail)) {
2285 // EVM option, ignore silently for compatibility
2286 // -Xprof
2287 } else if (match_option(option, "-Xprof", &tail)) {
2288 #ifndef FPROF_KERNEL
2289 _has_profile = true;
2290 #else // FPROF_KERNEL
2291 // do we have to exit?
2292 warning("Kernel VM does not support flat profiling.");
2293 #endif // FPROF_KERNEL
2294 // -Xaprof
2295 } else if (match_option(option, "-Xaprof", &tail)) {
2296 _has_alloc_profile = true;
2297 // -Xconcurrentio
2298 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2299 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2300 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2301 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2302 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2303 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2304
2305 // -Xinternalversion
2306 } else if (match_option(option, "-Xinternalversion", &tail)) {
2307 jio_fprintf(defaultStream::output_stream(), "%s\n",
2308 VM_Version::internal_vm_info_string());
2309 vm_exit(0);
2310 #ifndef PRODUCT
2311 // -Xprintflags
2312 } else if (match_option(option, "-Xprintflags", &tail)) {
2313 CommandLineFlags::printFlags();
2314 vm_exit(0);
2315 #endif
2316 // -D
2317 } else if (match_option(option, "-D", &tail)) {
2318 if (!add_property(tail)) {
2319 return JNI_ENOMEM;
2320 }
2321 // Out of the box management support
2322 if (match_option(option, "-Dcom.sun.management", &tail)) {
2323 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2324 }
2325 // -Xint
2326 } else if (match_option(option, "-Xint", &tail)) {
2327 set_mode_flags(_int);
2328 // -Xmixed
2329 } else if (match_option(option, "-Xmixed", &tail)) {
2330 set_mode_flags(_mixed);
2331 // -Xcomp
2332 } else if (match_option(option, "-Xcomp", &tail)) {
2333 // for testing the compiler; turn off all flags that inhibit compilation
2334 set_mode_flags(_comp);
2335
2336 // -Xshare:dump
2337 } else if (match_option(option, "-Xshare:dump", &tail)) {
2338 #ifdef TIERED
2339 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2340 set_mode_flags(_int); // Prevent compilation, which creates objects
2341 #elif defined(COMPILER2)
2342 vm_exit_during_initialization(
2343 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2344 #elif defined(KERNEL)
2345 vm_exit_during_initialization(
2346 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2347 #else
2348 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2349 set_mode_flags(_int); // Prevent compilation, which creates objects
2350 #endif
2351 // -Xshare:on
2352 } else if (match_option(option, "-Xshare:on", &tail)) {
2353 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2354 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2355 #ifdef TIERED
2356 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2357 #endif // TIERED
2358 // -Xshare:auto
2359 } else if (match_option(option, "-Xshare:auto", &tail)) {
2360 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2361 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2362 // -Xshare:off
2363 } else if (match_option(option, "-Xshare:off", &tail)) {
2364 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2365 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2366
2367 // -Xverify
2368 } else if (match_option(option, "-Xverify", &tail)) {
2369 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2370 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2371 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2372 } else if (strcmp(tail, ":remote") == 0) {
2373 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2374 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2375 } else if (strcmp(tail, ":none") == 0) {
2376 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2377 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2378 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2379 return JNI_EINVAL;
2380 }
2381 // -Xdebug
2382 } else if (match_option(option, "-Xdebug", &tail)) {
2383 // note this flag has been used, then ignore
2384 set_xdebug_mode(true);
2385 // -Xnoagent
2386 } else if (match_option(option, "-Xnoagent", &tail)) {
2387 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2388 } else if (match_option(option, "-Xboundthreads", &tail)) {
2389 // Bind user level threads to kernel threads (Solaris only)
2390 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2391 } else if (match_option(option, "-Xloggc:", &tail)) {
2392 // Redirect GC output to the file. -Xloggc:<filename>
2393 // ostream_init_log(), when called will use this filename
2394 // to initialize a fileStream.
2395 _gc_log_filename = strdup(tail);
2396 FLAG_SET_CMDLINE(bool, PrintGC, true);
2397 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2398 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2399
2400 // JNI hooks
2401 } else if (match_option(option, "-Xcheck", &tail)) {
2402 if (!strcmp(tail, ":jni")) {
2403 CheckJNICalls = true;
2404 } else if (is_bad_option(option, args->ignoreUnrecognized,
2405 "check")) {
2406 return JNI_EINVAL;
2407 }
2408 } else if (match_option(option, "vfprintf", &tail)) {
2409 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2410 } else if (match_option(option, "exit", &tail)) {
2411 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2412 } else if (match_option(option, "abort", &tail)) {
2413 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2414 // -XX:+AggressiveHeap
2415 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2416
2417 // This option inspects the machine and attempts to set various
2418 // parameters to be optimal for long-running, memory allocation
2419 // intensive jobs. It is intended for machines with large
2420 // amounts of cpu and memory.
2421
2422 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2423 // VM, but we may not be able to represent the total physical memory
2424 // available (like having 8gb of memory on a box but using a 32bit VM).
2425 // Thus, we need to make sure we're using a julong for intermediate
2426 // calculations.
2427 julong initHeapSize;
2428 julong total_memory = os::physical_memory();
2429
2430 if (total_memory < (julong)256*M) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2433 vm_exit(1);
2434 }
2435
2436 // The heap size is half of available memory, or (at most)
2437 // all of possible memory less 160mb (leaving room for the OS
2438 // when using ISM). This is the maximum; because adaptive sizing
2439 // is turned on below, the actual space used may be smaller.
2440
2441 initHeapSize = MIN2(total_memory / (julong)2,
2442 total_memory - (julong)160*M);
2443
2444 // Make sure that if we have a lot of memory we cap the 32 bit
2445 // process space. The 64bit VM version of this function is a nop.
2446 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2447
2448 // The perm gen is separate but contiguous with the
2449 // object heap (and is reserved with it) so subtract it
2450 // from the heap size.
2451 if (initHeapSize > MaxPermSize) {
2452 initHeapSize = initHeapSize - MaxPermSize;
2453 } else {
2454 warning("AggressiveHeap and MaxPermSize values may conflict");
2455 }
2456
2457 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2458 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2459 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2460 // Currently the minimum size and the initial heap sizes are the same.
2461 set_min_heap_size(initHeapSize);
2462 }
2463 if (FLAG_IS_DEFAULT(NewSize)) {
2464 // Make the young generation 3/8ths of the total heap.
2465 FLAG_SET_CMDLINE(uintx, NewSize,
2466 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2467 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2468 }
2469
2470 FLAG_SET_DEFAULT(UseLargePages, true);
2471
2472 // Increase some data structure sizes for efficiency
2473 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2474 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2475 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2476
2477 // See the OldPLABSize comment below, but replace 'after promotion'
2478 // with 'after copying'. YoungPLABSize is the size of the survivor
2479 // space per-gc-thread buffers. The default is 4kw.
2480 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2481
2482 // OldPLABSize is the size of the buffers in the old gen that
2483 // UseParallelGC uses to promote live data that doesn't fit in the
2484 // survivor spaces. At any given time, there's one for each gc thread.
2485 // The default size is 1kw. These buffers are rarely used, since the
2486 // survivor spaces are usually big enough. For specjbb, however, there
2487 // are occasions when there's lots of live data in the young gen
2488 // and we end up promoting some of it. We don't have a definite
2489 // explanation for why bumping OldPLABSize helps, but the theory
2490 // is that a bigger PLAB results in retaining something like the
2491 // original allocation order after promotion, which improves mutator
2492 // locality. A minor effect may be that larger PLABs reduce the
2493 // number of PLAB allocation events during gc. The value of 8kw
2494 // was arrived at by experimenting with specjbb.
2495 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2496
2497 // CompilationPolicyChoice=0 causes the server compiler to adopt
2498 // a more conservative which-method-do-I-compile policy when one
2499 // of the counters maintained by the interpreter trips. The
2500 // result is reduced startup time and improved specjbb and
2501 // alacrity performance. Zero is the default, but we set it
2502 // explicitly here in case the default changes.
2503 // See runtime/compilationPolicy.*.
2504 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2505
2506 // Enable parallel GC and adaptive generation sizing
2507 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2508 FLAG_SET_DEFAULT(ParallelGCThreads,
2509 Abstract_VM_Version::parallel_worker_threads());
2510
2511 // Encourage steady state memory management
2512 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2513
2514 // This appears to improve mutator locality
2515 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2516
2517 // Get around early Solaris scheduling bug
2518 // (affinity vs other jobs on system)
2519 // but disallow DR and offlining (5008695).
2520 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2521
2522 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2523 // The last option must always win.
2524 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2525 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2526 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2527 // The last option must always win.
2528 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2529 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2530 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2531 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Please use CMSClassUnloadingEnabled in place of "
2534 "CMSPermGenSweepingEnabled in the future\n");
2535 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2536 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Please use -XX:+UseGCOverheadLimit in place of "
2539 "-XX:+UseGCTimeLimit in the future\n");
2540 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2541 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Please use -XX:-UseGCOverheadLimit in place of "
2544 "-XX:-UseGCTimeLimit in the future\n");
2545 // The TLE options are for compatibility with 1.3 and will be
2546 // removed without notice in a future release. These options
2547 // are not to be documented.
2548 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2549 // No longer used.
2550 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2551 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2552 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2553 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2554 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2555 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2556 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2557 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2558 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2559 // No longer used.
2560 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2561 julong long_tlab_size = 0;
2562 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2563 if (errcode != arg_in_range) {
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Invalid TLAB size: %s\n", option->optionString);
2566 describe_range_error(errcode);
2567 return JNI_EINVAL;
2568 }
2569 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2570 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2571 // No longer used.
2572 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2573 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2574 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2575 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2576 SOLARIS_ONLY(
2577 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2578 warning("-XX:+UsePermISM is obsolete.");
2579 FLAG_SET_CMDLINE(bool, UseISM, true);
2580 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2581 FLAG_SET_CMDLINE(bool, UseISM, false);
2582 )
2583 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2584 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2585 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2586 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2587 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2588 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2589 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2590 #ifdef SOLARIS
2591 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2592 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2593 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2594 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2595 #else // ndef SOLARIS
2596 jio_fprintf(defaultStream::error_stream(),
2597 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2598 return JNI_EINVAL;
2599 #endif // ndef SOLARIS
2600 #ifdef ASSERT
2601 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2602 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2603 // disable scavenge before parallel mark-compact
2604 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2605 #endif
2606 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2607 julong cms_blocks_to_claim = (julong)atol(tail);
2608 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Please use -XX:OldPLABSize in place of "
2611 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2612 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2613 julong cms_blocks_to_claim = (julong)atol(tail);
2614 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Please use -XX:OldPLABSize in place of "
2617 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2618 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2619 julong old_plab_size = 0;
2620 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2621 if (errcode != arg_in_range) {
2622 jio_fprintf(defaultStream::error_stream(),
2623 "Invalid old PLAB size: %s\n", option->optionString);
2624 describe_range_error(errcode);
2625 return JNI_EINVAL;
2626 }
2627 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2628 jio_fprintf(defaultStream::error_stream(),
2629 "Please use -XX:OldPLABSize in place of "
2630 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2631 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2632 julong young_plab_size = 0;
2633 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2634 if (errcode != arg_in_range) {
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Invalid young PLAB size: %s\n", option->optionString);
2637 describe_range_error(errcode);
2638 return JNI_EINVAL;
2639 }
2640 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2641 jio_fprintf(defaultStream::error_stream(),
2642 "Please use -XX:YoungPLABSize in place of "
2643 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2644 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2645 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2646 julong stack_size = 0;
2647 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2648 if (errcode != arg_in_range) {
2649 jio_fprintf(defaultStream::error_stream(),
2650 "Invalid mark stack size: %s\n", option->optionString);
2651 describe_range_error(errcode);
2652 return JNI_EINVAL;
2653 }
2654 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2655 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2656 julong max_stack_size = 0;
2657 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2658 if (errcode != arg_in_range) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "Invalid maximum mark stack size: %s\n",
2661 option->optionString);
2662 describe_range_error(errcode);
2663 return JNI_EINVAL;
2664 }
2665 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2666 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2667 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2668 uintx conc_threads = 0;
2669 if (!parse_uintx(tail, &conc_threads, 1)) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Invalid concurrent threads: %s\n", option->optionString);
2672 return JNI_EINVAL;
2673 }
2674 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2675 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2676 // Skip -XX:Flags= since that case has already been handled
2677 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2678 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2679 return JNI_EINVAL;
2680 }
2681 }
2682 // Unknown option
2683 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2684 return JNI_ERR;
2685 }
2686 }
2687 // Change the default value for flags which have different default values
2688 // when working with older JDKs.
2689 if (JDK_Version::current().compare_major(6) <= 0 &&
2690 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2691 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2692 }
2693 #ifdef LINUX
2694 if (JDK_Version::current().compare_major(6) <= 0 &&
2695 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2696 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2697 }
2698 #endif // LINUX
2699 return JNI_OK;
2700 }
2701
2702 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2703 // This must be done after all -D arguments have been processed.
2704 scp_p->expand_endorsed();
2705
2706 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2707 // Assemble the bootclasspath elements into the final path.
2708 Arguments::set_sysclasspath(scp_p->combined_path());
2709 }
2710
2711 // This must be done after all arguments have been processed.
2712 // java_compiler() true means set to "NONE" or empty.
2713 if (java_compiler() && !xdebug_mode()) {
2714 // For backwards compatibility, we switch to interpreted mode if
2715 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2716 // not specified.
2717 set_mode_flags(_int);
2718 }
2719 if (CompileThreshold == 0) {
2720 set_mode_flags(_int);
2721 }
2722
2723 #ifndef COMPILER2
2724 // Don't degrade server performance for footprint
2725 if (FLAG_IS_DEFAULT(UseLargePages) &&
2726 MaxHeapSize < LargePageHeapSizeThreshold) {
2727 // No need for large granularity pages w/small heaps.
2728 // Note that large pages are enabled/disabled for both the
2729 // Java heap and the code cache.
2730 FLAG_SET_DEFAULT(UseLargePages, false);
2731 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2732 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2733 }
2734
2735 // Tiered compilation is undefined with C1.
2736 TieredCompilation = false;
2737 #else
2738 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2739 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2740 }
2741 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2742 if (UseG1GC) {
2743 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2744 }
2745 #endif
2746
2747 // If we are running in a headless jre, force java.awt.headless property
2748 // to be true unless the property has already been set.
2749 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2750 if (os::is_headless_jre()) {
2751 const char* headless = Arguments::get_property("java.awt.headless");
2752 if (headless == NULL) {
2753 char envbuffer[128];
2754 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2755 if (!add_property("java.awt.headless=true")) {
2756 return JNI_ENOMEM;
2757 }
2758 } else {
2759 char buffer[256];
2760 strcpy(buffer, "java.awt.headless=");
2761 strcat(buffer, envbuffer);
2762 if (!add_property(buffer)) {
2763 return JNI_ENOMEM;
2764 }
2765 }
2766 }
2767 }
2768
2769 if (!check_vm_args_consistency()) {
2770 return JNI_ERR;
2771 }
2772
2773 return JNI_OK;
2774 }
2775
2776 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2777 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2778 scp_assembly_required_p);
2779 }
2780
2781 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2782 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2783 scp_assembly_required_p);
2784 }
2785
2786 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2787 const int N_MAX_OPTIONS = 64;
2788 const int OPTION_BUFFER_SIZE = 1024;
2789 char buffer[OPTION_BUFFER_SIZE];
2790
2791 // The variable will be ignored if it exceeds the length of the buffer.
2792 // Don't check this variable if user has special privileges
2793 // (e.g. unix su command).
2794 if (os::getenv(name, buffer, sizeof(buffer)) &&
2795 !os::have_special_privileges()) {
2796 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Picked up %s: %s\n", name, buffer);
2799 char* rd = buffer; // pointer to the input string (rd)
2800 int i;
2801 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2802 while (isspace(*rd)) rd++; // skip whitespace
2803 if (*rd == 0) break; // we re done when the input string is read completely
2804
2805 // The output, option string, overwrites the input string.
2806 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2807 // input string (rd).
2808 char* wrt = rd;
2809
2810 options[i++].optionString = wrt; // Fill in option
2811 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2812 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2813 int quote = *rd; // matching quote to look for
2814 rd++; // don't copy open quote
2815 while (*rd != quote) { // include everything (even spaces) up until quote
2816 if (*rd == 0) { // string termination means unmatched string
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Unmatched quote in %s\n", name);
2819 return JNI_ERR;
2820 }
2821 *wrt++ = *rd++; // copy to option string
2822 }
2823 rd++; // don't copy close quote
2824 } else {
2825 *wrt++ = *rd++; // copy to option string
2826 }
2827 }
2828 // Need to check if we're done before writing a NULL,
2829 // because the write could be to the byte that rd is pointing to.
2830 if (*rd++ == 0) {
2831 *wrt = 0;
2832 break;
2833 }
2834 *wrt = 0; // Zero terminate option
2835 }
2836 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2837 JavaVMInitArgs vm_args;
2838 vm_args.version = JNI_VERSION_1_2;
2839 vm_args.options = options;
2840 vm_args.nOptions = i;
2841 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2842
2843 if (PrintVMOptions) {
2844 const char* tail;
2845 for (int i = 0; i < vm_args.nOptions; i++) {
2846 const JavaVMOption *option = vm_args.options + i;
2847 if (match_option(option, "-XX:", &tail)) {
2848 logOption(tail);
2849 }
2850 }
2851 }
2852
2853 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2854 }
2855 return JNI_OK;
2856 }
2857
2858
2859 // Parse entry point called from JNI_CreateJavaVM
2860
2861 jint Arguments::parse(const JavaVMInitArgs* args) {
2862
2863 // Sharing support
2864 // Construct the path to the archive
2865 char jvm_path[JVM_MAXPATHLEN];
2866 os::jvm_path(jvm_path, sizeof(jvm_path));
2867 #ifdef TIERED
2868 if (strstr(jvm_path, "client") != NULL) {
2869 force_client_mode = true;
2870 }
2871 #endif // TIERED
2872 char *end = strrchr(jvm_path, *os::file_separator());
2873 if (end != NULL) *end = '\0';
2874 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2875 strlen(os::file_separator()) + 20);
2876 if (shared_archive_path == NULL) return JNI_ENOMEM;
2877 strcpy(shared_archive_path, jvm_path);
2878 strcat(shared_archive_path, os::file_separator());
2879 strcat(shared_archive_path, "classes");
2880 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2881 strcat(shared_archive_path, ".jsa");
2882 SharedArchivePath = shared_archive_path;
2883
2884 // Remaining part of option string
2885 const char* tail;
2886
2887 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2888 bool settings_file_specified = false;
2889 const char* flags_file;
2890 int index;
2891 for (index = 0; index < args->nOptions; index++) {
2892 const JavaVMOption *option = args->options + index;
2893 if (match_option(option, "-XX:Flags=", &tail)) {
2894 flags_file = tail;
2895 settings_file_specified = true;
2896 }
2897 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2898 PrintVMOptions = true;
2899 }
2900 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2901 PrintVMOptions = false;
2902 }
2903 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2904 IgnoreUnrecognizedVMOptions = true;
2905 }
2906 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2907 IgnoreUnrecognizedVMOptions = false;
2908 }
2909 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2910 CommandLineFlags::printFlags();
2911 vm_exit(0);
2912 }
2913
2914 #ifndef PRODUCT
2915 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2916 CommandLineFlags::printFlags(true);
2917 vm_exit(0);
2918 }
2919 #endif
2920 }
2921
2922 if (IgnoreUnrecognizedVMOptions) {
2923 // uncast const to modify the flag args->ignoreUnrecognized
2924 *(jboolean*)(&args->ignoreUnrecognized) = true;
2925 }
2926
2927 // Parse specified settings file
2928 if (settings_file_specified) {
2929 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2930 return JNI_EINVAL;
2931 }
2932 }
2933
2934 // Parse default .hotspotrc settings file
2935 if (!settings_file_specified) {
2936 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2937 return JNI_EINVAL;
2938 }
2939 }
2940
2941 if (PrintVMOptions) {
2942 for (index = 0; index < args->nOptions; index++) {
2943 const JavaVMOption *option = args->options + index;
2944 if (match_option(option, "-XX:", &tail)) {
2945 logOption(tail);
2946 }
2947 }
2948 }
2949
2950 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2951 jint result = parse_vm_init_args(args);
2952 if (result != JNI_OK) {
2953 return result;
2954 }
2955
2956 #ifndef PRODUCT
2957 if (TraceBytecodesAt != 0) {
2958 TraceBytecodes = true;
2959 }
2960 if (CountCompiledCalls) {
2961 if (UseCounterDecay) {
2962 warning("UseCounterDecay disabled because CountCalls is set");
2963 UseCounterDecay = false;
2964 }
2965 }
2966 #endif // PRODUCT
2967
2968 if (EnableInvokeDynamic && !EnableMethodHandles) {
2969 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2970 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2971 }
2972 EnableMethodHandles = true;
2973 }
2974 if (EnableMethodHandles && !AnonymousClasses) {
2975 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2976 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2977 }
2978 AnonymousClasses = true;
2979 }
2980 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2981 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2982 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2983 }
2984 ScavengeRootsInCode = 1;
2985 }
2986 #ifdef COMPILER2
2987 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2988 // TODO: We need to find rules for invokedynamic and EA. For now,
2989 // simply disable EA by default.
2990 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2991 DoEscapeAnalysis = false;
2992 }
2993 }
2994 #endif
2995
2996 if (PrintGCDetails) {
2997 // Turn on -verbose:gc options as well
2998 PrintGC = true;
2999 }
3000
3001 // Set object alignment values.
3002 set_object_alignment();
3003
3004 #ifdef SERIALGC
3005 force_serial_gc();
3006 #endif // SERIALGC
3007 #ifdef KERNEL
3008 no_shared_spaces();
3009 #endif // KERNEL
3010
3011 // Set flags based on ergonomics.
3012 set_ergonomics_flags();
3013
3014 #ifdef _LP64
3015 if (UseCompressedOops) {
3016 check_compressed_oops_compat();
3017 }
3018 #endif
3019
3020 // Check the GC selections again.
3021 if (!check_gc_consistency()) {
3022 return JNI_EINVAL;
3023 }
3024
3025 if (TieredCompilation) {
3026 set_tiered_flags();
3027 } else {
3028 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3029 if (CompilationPolicyChoice >= 2) {
3030 vm_exit_during_initialization(
3031 "Incompatible compilation policy selected", NULL);
3032 }
3033 }
3034
3035 #ifndef KERNEL
3036 if (UseConcMarkSweepGC) {
3037 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3038 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3039 // are true, we don't call set_parnew_gc_flags() as well.
3040 set_cms_and_parnew_gc_flags();
3041 } else {
3042 // Set heap size based on available physical memory
3043 set_heap_size();
3044 // Set per-collector flags
3045 if (UseParallelGC || UseParallelOldGC) {
3046 set_parallel_gc_flags();
3047 } else if (UseParNewGC) {
3048 set_parnew_gc_flags();
3049 } else if (UseG1GC) {
3050 set_g1_gc_flags();
3051 }
3052 }
3053 #endif // KERNEL
3054
3055 #ifdef SERIALGC
3056 assert(verify_serial_gc_flags(), "SerialGC unset");
3057 #endif // SERIALGC
3058
3059 // Set bytecode rewriting flags
3060 set_bytecode_flags();
3061
3062 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3063 set_aggressive_opts_flags();
3064
3065 #ifdef CC_INTERP
3066 // Clear flags not supported by the C++ interpreter
3067 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3068 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3069 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3070 #endif // CC_INTERP
3071
3072 #ifdef COMPILER2
3073 if (!UseBiasedLocking || EmitSync != 0) {
3074 UseOptoBiasInlining = false;
3075 }
3076 #endif
3077
3078 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3079 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3080 DebugNonSafepoints = true;
3081 }
3082
3083 #ifndef PRODUCT
3084 if (CompileTheWorld) {
3085 // Force NmethodSweeper to sweep whole CodeCache each time.
3086 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3087 NmethodSweepFraction = 1;
3088 }
3089 }
3090 #endif
3091
3092 if (PrintCommandLineFlags) {
3093 CommandLineFlags::printSetFlags();
3094 }
3095
3096 // Apply CPU specific policy for the BiasedLocking
3097 if (UseBiasedLocking) {
3098 if (!VM_Version::use_biased_locking() &&
3099 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3100 UseBiasedLocking = false;
3101 }
3102 }
3103
3104 return JNI_OK;
3105 }
3106
3107 int Arguments::PropertyList_count(SystemProperty* pl) {
3108 int count = 0;
3109 while(pl != NULL) {
3110 count++;
3111 pl = pl->next();
3112 }
3113 return count;
3114 }
3115
3116 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3117 assert(key != NULL, "just checking");
3118 SystemProperty* prop;
3119 for (prop = pl; prop != NULL; prop = prop->next()) {
3120 if (strcmp(key, prop->key()) == 0) return prop->value();
3121 }
3122 return NULL;
3123 }
3124
3125 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3126 int count = 0;
3127 const char* ret_val = NULL;
3128
3129 while(pl != NULL) {
3130 if(count >= index) {
3131 ret_val = pl->key();
3132 break;
3133 }
3134 count++;
3135 pl = pl->next();
3136 }
3137
3138 return ret_val;
3139 }
3140
3141 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3142 int count = 0;
3143 char* ret_val = NULL;
3144
3145 while(pl != NULL) {
3146 if(count >= index) {
3147 ret_val = pl->value();
3148 break;
3149 }
3150 count++;
3151 pl = pl->next();
3152 }
3153
3154 return ret_val;
3155 }
3156
3157 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3158 SystemProperty* p = *plist;
3159 if (p == NULL) {
3160 *plist = new_p;
3161 } else {
3162 while (p->next() != NULL) {
3163 p = p->next();
3164 }
3165 p->set_next(new_p);
3166 }
3167 }
3168
3169 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3170 if (plist == NULL)
3171 return;
3172
3173 SystemProperty* new_p = new SystemProperty(k, v, true);
3174 PropertyList_add(plist, new_p);
3175 }
3176
3177 // This add maintains unique property key in the list.
3178 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3179 if (plist == NULL)
3180 return;
3181
3182 // If property key exist then update with new value.
3183 SystemProperty* prop;
3184 for (prop = *plist; prop != NULL; prop = prop->next()) {
3185 if (strcmp(k, prop->key()) == 0) {
3186 if (append) {
3187 prop->append_value(v);
3188 } else {
3189 prop->set_value(v);
3190 }
3191 return;
3192 }
3193 }
3194
3195 PropertyList_add(plist, k, v);
3196 }
3197
3198 #ifdef KERNEL
3199 char *Arguments::get_kernel_properties() {
3200 // Find properties starting with kernel and append them to string
3201 // We need to find out how long they are first because the URL's that they
3202 // might point to could get long.
3203 int length = 0;
3204 SystemProperty* prop;
3205 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3206 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3207 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3208 }
3209 }
3210 // Add one for null terminator.
3211 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3212 if (length != 0) {
3213 int pos = 0;
3214 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3215 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3216 jio_snprintf(&props[pos], length-pos,
3217 "-D%s=%s ", prop->key(), prop->value());
3218 pos = strlen(props);
3219 }
3220 }
3221 }
3222 // null terminate props in case of null
3223 props[length] = '\0';
3224 return props;
3225 }
3226 #endif // KERNEL
3227
3228 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3229 // Returns true if all of the source pointed by src has been copied over to
3230 // the destination buffer pointed by buf. Otherwise, returns false.
3231 // Notes:
3232 // 1. If the length (buflen) of the destination buffer excluding the
3233 // NULL terminator character is not long enough for holding the expanded
3234 // pid characters, it also returns false instead of returning the partially
3235 // expanded one.
3236 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3237 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3238 char* buf, size_t buflen) {
3239 const char* p = src;
3240 char* b = buf;
3241 const char* src_end = &src[srclen];
3242 char* buf_end = &buf[buflen - 1];
3243
3244 while (p < src_end && b < buf_end) {
3245 if (*p == '%') {
3246 switch (*(++p)) {
3247 case '%': // "%%" ==> "%"
3248 *b++ = *p++;
3249 break;
3250 case 'p': { // "%p" ==> current process id
3251 // buf_end points to the character before the last character so
3252 // that we could write '\0' to the end of the buffer.
3253 size_t buf_sz = buf_end - b + 1;
3254 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3255
3256 // if jio_snprintf fails or the buffer is not long enough to hold
3257 // the expanded pid, returns false.
3258 if (ret < 0 || ret >= (int)buf_sz) {
3259 return false;
3260 } else {
3261 b += ret;
3262 assert(*b == '\0', "fail in copy_expand_pid");
3263 if (p == src_end && b == buf_end + 1) {
3264 // reach the end of the buffer.
3265 return true;
3266 }
3267 }
3268 p++;
3269 break;
3270 }
3271 default :
3272 *b++ = '%';
3273 }
3274 } else {
3275 *b++ = *p++;
3276 }
3277 }
3278 *b = '\0';
3279 return (p == src_end); // return false if not all of the source was copied
3280 }