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 # if defined(COMPILER1) && !defined(TIERED)
964 // Until c1 supports compressed oops turn them off.
965 FLAG_SET_DEFAULT(UseCompressedOops, false);
966 # else
967 // Is it on by default or set on ergonomically
968 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
969
970 // Tiered currently doesn't work with compressed oops
971 if (TieredCompilation) {
972 if (is_on_by_default) {
973 FLAG_SET_DEFAULT(UseCompressedOops, false);
974 return;
975 } else {
976 vm_exit_during_initialization(
977 "Tiered compilation is not supported with compressed oops yet", NULL);
978 }
979 }
980
981 // If dumping an archive or forcing its use, disable compressed oops if possible
982 if (DumpSharedSpaces || RequireSharedSpaces) {
983 if (is_on_by_default) {
984 FLAG_SET_DEFAULT(UseCompressedOops, false);
985 return;
986 } else {
987 vm_exit_during_initialization(
988 "Class Data Sharing is not supported with compressed oops yet", NULL);
989 }
990 } else if (UseSharedSpaces) {
991 // UseSharedSpaces is on by default. With compressed oops, we turn it off.
992 FLAG_SET_DEFAULT(UseSharedSpaces, false);
993 }
994
995 # endif // defined(COMPILER1) && !defined(TIERED)
996 #endif // _LP64
997 }
998
999 void Arguments::set_tiered_flags() {
1000 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1001 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1002 }
1003 if (CompilationPolicyChoice < 2) {
1004 vm_exit_during_initialization(
1005 "Incompatible compilation policy selected", NULL);
1006 }
1007 // Increase the code cache size - tiered compiles a lot more.
1008 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1009 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1010 }
1011 }
1012
1013 #ifndef KERNEL
1014 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1015 // if it's not explictly set or unset. If the user has chosen
1016 // UseParNewGC and not explicitly set ParallelGCThreads we
1017 // set it, unless this is a single cpu machine.
1018 void Arguments::set_parnew_gc_flags() {
1019 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1020 "control point invariant");
1021 assert(UseParNewGC, "Error");
1022
1023 // Turn off AdaptiveSizePolicy by default for parnew until it is
1024 // complete.
1025 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1026 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1027 }
1028
1029 if (ParallelGCThreads == 0) {
1030 FLAG_SET_DEFAULT(ParallelGCThreads,
1031 Abstract_VM_Version::parallel_worker_threads());
1032 if (ParallelGCThreads == 1) {
1033 FLAG_SET_DEFAULT(UseParNewGC, false);
1034 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1035 }
1036 }
1037 if (UseParNewGC) {
1038 // CDS doesn't work with ParNew yet
1039 no_shared_spaces();
1040
1041 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1042 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1043 // we set them to 1024 and 1024.
1044 // See CR 6362902.
1045 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1046 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1047 }
1048 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1049 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1050 }
1051
1052 // AlwaysTenure flag should make ParNew promote all at first collection.
1053 // See CR 6362902.
1054 if (AlwaysTenure) {
1055 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1056 }
1057 // When using compressed oops, we use local overflow stacks,
1058 // rather than using a global overflow list chained through
1059 // the klass word of the object's pre-image.
1060 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1061 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1062 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1063 }
1064 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1065 }
1066 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1067 }
1068 }
1069
1070 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1071 // sparc/solaris for certain applications, but would gain from
1072 // further optimization and tuning efforts, and would almost
1073 // certainly gain from analysis of platform and environment.
1074 void Arguments::set_cms_and_parnew_gc_flags() {
1075 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1076 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1077
1078 // If we are using CMS, we prefer to UseParNewGC,
1079 // unless explicitly forbidden.
1080 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1081 FLAG_SET_ERGO(bool, UseParNewGC, true);
1082 }
1083
1084 // Turn off AdaptiveSizePolicy by default for cms until it is
1085 // complete.
1086 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1087 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1088 }
1089
1090 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1091 // as needed.
1092 if (UseParNewGC) {
1093 set_parnew_gc_flags();
1094 }
1095
1096 // Now make adjustments for CMS
1097 size_t young_gen_per_worker;
1098 intx new_ratio;
1099 size_t min_new_default;
1100 intx tenuring_default;
1101 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1102 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1103 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1104 }
1105 young_gen_per_worker = 4*M;
1106 new_ratio = (intx)15;
1107 min_new_default = 4*M;
1108 tenuring_default = (intx)0;
1109 } else { // new defaults: "new" as of 6.0
1110 young_gen_per_worker = CMSYoungGenPerWorker;
1111 new_ratio = (intx)7;
1112 min_new_default = 16*M;
1113 tenuring_default = (intx)4;
1114 }
1115
1116 // Preferred young gen size for "short" pauses
1117 const uintx parallel_gc_threads =
1118 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1119 const size_t preferred_max_new_size_unaligned =
1120 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1121 const size_t preferred_max_new_size =
1122 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1123
1124 // Unless explicitly requested otherwise, size young gen
1125 // for "short" pauses ~ 4M*ParallelGCThreads
1126
1127 // If either MaxNewSize or NewRatio is set on the command line,
1128 // assume the user is trying to set the size of the young gen.
1129
1130 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1131
1132 // Set MaxNewSize to our calculated preferred_max_new_size unless
1133 // NewSize was set on the command line and it is larger than
1134 // preferred_max_new_size.
1135 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1136 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1137 } else {
1138 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1139 }
1140 if (PrintGCDetails && Verbose) {
1141 // Too early to use gclog_or_tty
1142 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1143 }
1144
1145 // Unless explicitly requested otherwise, prefer a large
1146 // Old to Young gen size so as to shift the collection load
1147 // to the old generation concurrent collector
1148
1149 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1150 // then NewSize and OldSize may be calculated. That would
1151 // generally lead to some differences with ParNewGC for which
1152 // there was no obvious reason. Also limit to the case where
1153 // MaxNewSize has not been set.
1154
1155 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1156
1157 // Code along this path potentially sets NewSize and OldSize
1158
1159 // Calculate the desired minimum size of the young gen but if
1160 // NewSize has been set on the command line, use it here since
1161 // it should be the final value.
1162 size_t min_new;
1163 if (FLAG_IS_DEFAULT(NewSize)) {
1164 min_new = align_size_up(ScaleForWordSize(min_new_default),
1165 os::vm_page_size());
1166 } else {
1167 min_new = NewSize;
1168 }
1169 size_t prev_initial_size = InitialHeapSize;
1170 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1171 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1172 // Currently minimum size and the initial heap sizes are the same.
1173 set_min_heap_size(InitialHeapSize);
1174 if (PrintGCDetails && Verbose) {
1175 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1176 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1177 InitialHeapSize/M, prev_initial_size/M);
1178 }
1179 }
1180
1181 // MaxHeapSize is aligned down in collectorPolicy
1182 size_t max_heap =
1183 align_size_down(MaxHeapSize,
1184 CardTableRS::ct_max_alignment_constraint());
1185
1186 if (PrintGCDetails && Verbose) {
1187 // Too early to use gclog_or_tty
1188 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1189 " initial_heap_size: " SIZE_FORMAT
1190 " max_heap: " SIZE_FORMAT,
1191 min_heap_size(), InitialHeapSize, max_heap);
1192 }
1193 if (max_heap > min_new) {
1194 // Unless explicitly requested otherwise, make young gen
1195 // at least min_new, and at most preferred_max_new_size.
1196 if (FLAG_IS_DEFAULT(NewSize)) {
1197 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1198 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1199 if (PrintGCDetails && Verbose) {
1200 // Too early to use gclog_or_tty
1201 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1202 }
1203 }
1204 // Unless explicitly requested otherwise, size old gen
1205 // so that it's at least 3X of NewSize to begin with;
1206 // later NewRatio will decide how it grows; see above.
1207 if (FLAG_IS_DEFAULT(OldSize)) {
1208 if (max_heap > NewSize) {
1209 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1210 if (PrintGCDetails && Verbose) {
1211 // Too early to use gclog_or_tty
1212 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1213 }
1214 }
1215 }
1216 }
1217 }
1218 // Unless explicitly requested otherwise, definitely
1219 // promote all objects surviving "tenuring_default" scavenges.
1220 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1221 FLAG_IS_DEFAULT(SurvivorRatio)) {
1222 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1223 }
1224 // If we decided above (or user explicitly requested)
1225 // `promote all' (via MaxTenuringThreshold := 0),
1226 // prefer minuscule survivor spaces so as not to waste
1227 // space for (non-existent) survivors
1228 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1229 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1230 }
1231 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1232 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1233 // This is done in order to make ParNew+CMS configuration to work
1234 // with YoungPLABSize and OldPLABSize options.
1235 // See CR 6362902.
1236 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1237 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1238 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1239 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1240 // the value (either from the command line or ergonomics) of
1241 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1242 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1243 } else {
1244 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1245 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1246 // we'll let it to take precedence.
1247 jio_fprintf(defaultStream::error_stream(),
1248 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1249 " options are specified for the CMS collector."
1250 " CMSParPromoteBlocksToClaim will take precedence.\n");
1251 }
1252 }
1253 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1254 // OldPLAB sizing manually turned off: Use a larger default setting,
1255 // unless it was manually specified. This is because a too-low value
1256 // will slow down scavenges.
1257 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1258 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1259 }
1260 }
1261 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1262 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1263 // If either of the static initialization defaults have changed, note this
1264 // modification.
1265 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1266 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1267 }
1268 if (PrintGCDetails && Verbose) {
1269 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1270 MarkStackSize / K, MarkStackSizeMax / K);
1271 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1272 }
1273 }
1274 #endif // KERNEL
1275
1276 void set_object_alignment() {
1277 // Object alignment.
1278 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1279 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1280 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1281 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1282 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1283 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1284
1285 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1286 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1287
1288 // Oop encoding heap max
1289 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1290
1291 #ifndef KERNEL
1292 // Set CMS global values
1293 CompactibleFreeListSpace::set_cms_values();
1294 #endif // KERNEL
1295 }
1296
1297 bool verify_object_alignment() {
1298 // Object alignment.
1299 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1302 (int)ObjectAlignmentInBytes);
1303 return false;
1304 }
1305 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1306 jio_fprintf(defaultStream::error_stream(),
1307 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1308 (int)ObjectAlignmentInBytes, BytesPerLong);
1309 return false;
1310 }
1311 // It does not make sense to have big object alignment
1312 // since a space lost due to alignment will be greater
1313 // then a saved space from compressed oops.
1314 if ((int)ObjectAlignmentInBytes > 256) {
1315 jio_fprintf(defaultStream::error_stream(),
1316 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1317 (int)ObjectAlignmentInBytes);
1318 return false;
1319 }
1320 // In case page size is very small.
1321 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1322 jio_fprintf(defaultStream::error_stream(),
1323 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1324 (int)ObjectAlignmentInBytes, os::vm_page_size());
1325 return false;
1326 }
1327 return true;
1328 }
1329
1330 inline uintx max_heap_for_compressed_oops() {
1331 // Heap should be above HeapBaseMinAddress to get zero based compressed oops.
1332 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size() - HeapBaseMinAddress);
1333 NOT_LP64(ShouldNotReachHere(); return 0);
1334 }
1335
1336 bool Arguments::should_auto_select_low_pause_collector() {
1337 if (UseAutoGCSelectPolicy &&
1338 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1339 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1340 if (PrintGCDetails) {
1341 // Cannot use gclog_or_tty yet.
1342 tty->print_cr("Automatic selection of the low pause collector"
1343 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1344 }
1345 return true;
1346 }
1347 return false;
1348 }
1349
1350 void Arguments::set_ergonomics_flags() {
1351 // Parallel GC is not compatible with sharing. If one specifies
1352 // that they want sharing explicitly, do not set ergonomics flags.
1353 if (DumpSharedSpaces || ForceSharedSpaces) {
1354 return;
1355 }
1356
1357 if (os::is_server_class_machine() && !force_client_mode ) {
1358 // If no other collector is requested explicitly,
1359 // let the VM select the collector based on
1360 // machine class and automatic selection policy.
1361 if (!UseSerialGC &&
1362 !UseConcMarkSweepGC &&
1363 !UseG1GC &&
1364 !UseParNewGC &&
1365 !DumpSharedSpaces &&
1366 FLAG_IS_DEFAULT(UseParallelGC)) {
1367 if (should_auto_select_low_pause_collector()) {
1368 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1369 } else {
1370 FLAG_SET_ERGO(bool, UseParallelGC, true);
1371 }
1372 no_shared_spaces();
1373 }
1374 }
1375
1376 #ifndef ZERO
1377 #ifdef _LP64
1378 // Check that UseCompressedOops can be set with the max heap size allocated
1379 // by ergonomics.
1380 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1381 #if !defined(COMPILER1) || defined(TIERED)
1382 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1383 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1384 }
1385 #endif
1386 #ifdef _WIN64
1387 if (UseLargePages && UseCompressedOops) {
1388 // Cannot allocate guard pages for implicit checks in indexed addressing
1389 // mode, when large pages are specified on windows.
1390 // This flag could be switched ON if narrow oop base address is set to 0,
1391 // see code in Universe::initialize_heap().
1392 Universe::set_narrow_oop_use_implicit_null_checks(false);
1393 }
1394 #endif // _WIN64
1395 } else {
1396 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1397 warning("Max heap size too large for Compressed Oops");
1398 FLAG_SET_DEFAULT(UseCompressedOops, false);
1399 }
1400 }
1401 // Also checks that certain machines are slower with compressed oops
1402 // in vm_version initialization code.
1403 #endif // _LP64
1404 #endif // !ZERO
1405 }
1406
1407 void Arguments::set_parallel_gc_flags() {
1408 assert(UseParallelGC || UseParallelOldGC, "Error");
1409 // If parallel old was requested, automatically enable parallel scavenge.
1410 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1411 FLAG_SET_DEFAULT(UseParallelGC, true);
1412 }
1413
1414 // If no heap maximum was requested explicitly, use some reasonable fraction
1415 // of the physical memory, up to a maximum of 1GB.
1416 if (UseParallelGC) {
1417 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1418 Abstract_VM_Version::parallel_worker_threads());
1419
1420 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1421 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1422 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1423 // See CR 6362902 for details.
1424 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1425 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1426 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1427 }
1428 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1429 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1430 }
1431 }
1432
1433 if (UseParallelOldGC) {
1434 // Par compact uses lower default values since they are treated as
1435 // minimums. These are different defaults because of the different
1436 // interpretation and are not ergonomically set.
1437 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1438 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1439 }
1440 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1441 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1442 }
1443 }
1444 }
1445 }
1446
1447 void Arguments::set_g1_gc_flags() {
1448 assert(UseG1GC, "Error");
1449 #ifdef COMPILER1
1450 FastTLABRefill = false;
1451 #endif
1452 FLAG_SET_DEFAULT(ParallelGCThreads,
1453 Abstract_VM_Version::parallel_worker_threads());
1454 if (ParallelGCThreads == 0) {
1455 FLAG_SET_DEFAULT(ParallelGCThreads,
1456 Abstract_VM_Version::parallel_worker_threads());
1457 }
1458 no_shared_spaces();
1459
1460 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1461 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1462 }
1463 if (PrintGCDetails && Verbose) {
1464 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1465 MarkStackSize / K, MarkStackSizeMax / K);
1466 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1467 }
1468
1469 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1470 // In G1, we want the default GC overhead goal to be higher than
1471 // say in PS. So we set it here to 10%. Otherwise the heap might
1472 // be expanded more aggressively than we would like it to. In
1473 // fact, even 10% seems to not be high enough in some cases
1474 // (especially small GC stress tests that the main thing they do
1475 // is allocation). We might consider increase it further.
1476 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1477 }
1478 }
1479
1480 void Arguments::set_heap_size() {
1481 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1482 // Deprecated flag
1483 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1484 }
1485
1486 const julong phys_mem =
1487 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1488 : (julong)MaxRAM;
1489
1490 // If the maximum heap size has not been set with -Xmx,
1491 // then set it as fraction of the size of physical memory,
1492 // respecting the maximum and minimum sizes of the heap.
1493 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1494 julong reasonable_max = phys_mem / MaxRAMFraction;
1495
1496 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1497 // Small physical memory, so use a minimum fraction of it for the heap
1498 reasonable_max = phys_mem / MinRAMFraction;
1499 } else {
1500 // Not-small physical memory, so require a heap at least
1501 // as large as MaxHeapSize
1502 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1503 }
1504 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1505 // Limit the heap size to ErgoHeapSizeLimit
1506 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1507 }
1508 if (UseCompressedOops) {
1509 // Limit the heap size to the maximum possible when using compressed oops
1510 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1511 }
1512 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1513
1514 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1515 // An initial heap size was specified on the command line,
1516 // so be sure that the maximum size is consistent. Done
1517 // after call to allocatable_physical_memory because that
1518 // method might reduce the allocation size.
1519 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1520 }
1521
1522 if (PrintGCDetails && Verbose) {
1523 // Cannot use gclog_or_tty yet.
1524 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1525 }
1526 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1527 }
1528
1529 // If the initial_heap_size has not been set with InitialHeapSize
1530 // or -Xms, then set it as fraction of the size of physical memory,
1531 // respecting the maximum and minimum sizes of the heap.
1532 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1533 julong reasonable_minimum = (julong)(OldSize + NewSize);
1534
1535 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1536
1537 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1538
1539 julong reasonable_initial = phys_mem / InitialRAMFraction;
1540
1541 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1542 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1543
1544 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1545
1546 if (PrintGCDetails && Verbose) {
1547 // Cannot use gclog_or_tty yet.
1548 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1549 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1550 }
1551 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1552 set_min_heap_size((uintx)reasonable_minimum);
1553 }
1554 }
1555
1556 // This must be called after ergonomics because we want bytecode rewriting
1557 // if the server compiler is used, or if UseSharedSpaces is disabled.
1558 void Arguments::set_bytecode_flags() {
1559 // Better not attempt to store into a read-only space.
1560 if (UseSharedSpaces) {
1561 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1562 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1563 }
1564
1565 if (!RewriteBytecodes) {
1566 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1567 }
1568 }
1569
1570 // Aggressive optimization flags -XX:+AggressiveOpts
1571 void Arguments::set_aggressive_opts_flags() {
1572 #ifdef COMPILER2
1573 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1574 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1575 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1576 }
1577 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1578 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1579 }
1580
1581 // Feed the cache size setting into the JDK
1582 char buffer[1024];
1583 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1584 add_property(buffer);
1585 }
1586 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1587 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1588 }
1589 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1590 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1591 }
1592 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1593 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1594 }
1595 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1596 FLAG_SET_DEFAULT(OptimizeFill, true);
1597 }
1598 #endif
1599
1600 if (AggressiveOpts) {
1601 // Sample flag setting code
1602 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1603 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1604 // }
1605 }
1606 }
1607
1608 //===========================================================================================================
1609 // Parsing of java.compiler property
1610
1611 void Arguments::process_java_compiler_argument(char* arg) {
1612 // For backwards compatibility, Djava.compiler=NONE or ""
1613 // causes us to switch to -Xint mode UNLESS -Xdebug
1614 // is also specified.
1615 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1616 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1617 }
1618 }
1619
1620 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1621 _sun_java_launcher = strdup(launcher);
1622 }
1623
1624 bool Arguments::created_by_java_launcher() {
1625 assert(_sun_java_launcher != NULL, "property must have value");
1626 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1627 }
1628
1629 //===========================================================================================================
1630 // Parsing of main arguments
1631
1632 bool Arguments::verify_interval(uintx val, uintx min,
1633 uintx max, const char* name) {
1634 // Returns true iff value is in the inclusive interval [min..max]
1635 // false, otherwise.
1636 if (val >= min && val <= max) {
1637 return true;
1638 }
1639 jio_fprintf(defaultStream::error_stream(),
1640 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1641 " and " UINTX_FORMAT "\n",
1642 name, val, min, max);
1643 return false;
1644 }
1645
1646 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1647 // Returns true if given value is greater than specified min threshold
1648 // false, otherwise.
1649 if (val >= min ) {
1650 return true;
1651 }
1652 jio_fprintf(defaultStream::error_stream(),
1653 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1654 name, val, min);
1655 return false;
1656 }
1657
1658 bool Arguments::verify_percentage(uintx value, const char* name) {
1659 if (value <= 100) {
1660 return true;
1661 }
1662 jio_fprintf(defaultStream::error_stream(),
1663 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1664 name, value);
1665 return false;
1666 }
1667
1668 static void force_serial_gc() {
1669 FLAG_SET_DEFAULT(UseSerialGC, true);
1670 FLAG_SET_DEFAULT(UseParNewGC, false);
1671 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1672 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1673 FLAG_SET_DEFAULT(UseParallelGC, false);
1674 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1675 FLAG_SET_DEFAULT(UseG1GC, false);
1676 }
1677
1678 static bool verify_serial_gc_flags() {
1679 return (UseSerialGC &&
1680 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1681 UseParallelGC || UseParallelOldGC));
1682 }
1683
1684 // Check consistency of GC selection
1685 bool Arguments::check_gc_consistency() {
1686 bool status = true;
1687 // Ensure that the user has not selected conflicting sets
1688 // of collectors. [Note: this check is merely a user convenience;
1689 // collectors over-ride each other so that only a non-conflicting
1690 // set is selected; however what the user gets is not what they
1691 // may have expected from the combination they asked for. It's
1692 // better to reduce user confusion by not allowing them to
1693 // select conflicting combinations.
1694 uint i = 0;
1695 if (UseSerialGC) i++;
1696 if (UseConcMarkSweepGC || UseParNewGC) i++;
1697 if (UseParallelGC || UseParallelOldGC) i++;
1698 if (UseG1GC) i++;
1699 if (i > 1) {
1700 jio_fprintf(defaultStream::error_stream(),
1701 "Conflicting collector combinations in option list; "
1702 "please refer to the release notes for the combinations "
1703 "allowed\n");
1704 status = false;
1705 }
1706
1707 return status;
1708 }
1709
1710 // Check stack pages settings
1711 bool Arguments::check_stack_pages()
1712 {
1713 bool status = true;
1714 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1715 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1716 // greater stack shadow pages can't generate instruction to bang stack
1717 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1718 return status;
1719 }
1720
1721 // Check the consistency of vm_init_args
1722 bool Arguments::check_vm_args_consistency() {
1723 // Method for adding checks for flag consistency.
1724 // The intent is to warn the user of all possible conflicts,
1725 // before returning an error.
1726 // Note: Needs platform-dependent factoring.
1727 bool status = true;
1728
1729 #if ( (defined(COMPILER2) && defined(SPARC)))
1730 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1731 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1732 // x86. Normally, VM_Version_init must be called from init_globals in
1733 // init.cpp, which is called by the initial java thread *after* arguments
1734 // have been parsed. VM_Version_init gets called twice on sparc.
1735 extern void VM_Version_init();
1736 VM_Version_init();
1737 if (!VM_Version::has_v9()) {
1738 jio_fprintf(defaultStream::error_stream(),
1739 "V8 Machine detected, Server requires V9\n");
1740 status = false;
1741 }
1742 #endif /* COMPILER2 && SPARC */
1743
1744 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1745 // builds so the cost of stack banging can be measured.
1746 #if (defined(PRODUCT) && defined(SOLARIS))
1747 if (!UseBoundThreads && !UseStackBanging) {
1748 jio_fprintf(defaultStream::error_stream(),
1749 "-UseStackBanging conflicts with -UseBoundThreads\n");
1750
1751 status = false;
1752 }
1753 #endif
1754
1755 if (TLABRefillWasteFraction == 0) {
1756 jio_fprintf(defaultStream::error_stream(),
1757 "TLABRefillWasteFraction should be a denominator, "
1758 "not " SIZE_FORMAT "\n",
1759 TLABRefillWasteFraction);
1760 status = false;
1761 }
1762
1763 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1764 "AdaptiveSizePolicyWeight");
1765 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1766 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1767 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1768 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1769
1770 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1771 jio_fprintf(defaultStream::error_stream(),
1772 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1773 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1774 MinHeapFreeRatio, MaxHeapFreeRatio);
1775 status = false;
1776 }
1777 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1778 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1779
1780 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1781 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1782 }
1783
1784 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1785 // Settings to encourage splitting.
1786 if (!FLAG_IS_CMDLINE(NewRatio)) {
1787 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1788 }
1789 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1790 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1791 }
1792 }
1793
1794 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1795 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1796 if (GCTimeLimit == 100) {
1797 // Turn off gc-overhead-limit-exceeded checks
1798 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1799 }
1800
1801 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1802
1803 // Check whether user-specified sharing option conflicts with GC or page size.
1804 // Both sharing and large pages are enabled by default on some platforms;
1805 // large pages override sharing only if explicitly set on the command line.
1806 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1807 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1808 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1809 if (cannot_share) {
1810 // Either force sharing on by forcing the other options off, or
1811 // force sharing off.
1812 if (DumpSharedSpaces || ForceSharedSpaces) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "Using Serial GC and default page size because of %s\n",
1815 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1816 force_serial_gc();
1817 FLAG_SET_DEFAULT(UseLargePages, false);
1818 } else {
1819 if (UseSharedSpaces && Verbose) {
1820 jio_fprintf(defaultStream::error_stream(),
1821 "Turning off use of shared archive because of "
1822 "choice of garbage collector or large pages\n");
1823 }
1824 no_shared_spaces();
1825 }
1826 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1827 FLAG_SET_DEFAULT(UseLargePages, false);
1828 }
1829
1830 status = status && check_gc_consistency();
1831 status = status && check_stack_pages();
1832
1833 if (_has_alloc_profile) {
1834 if (UseParallelGC || UseParallelOldGC) {
1835 jio_fprintf(defaultStream::error_stream(),
1836 "error: invalid argument combination.\n"
1837 "Allocation profiling (-Xaprof) cannot be used together with "
1838 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1839 status = false;
1840 }
1841 if (UseConcMarkSweepGC) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "error: invalid argument combination.\n"
1844 "Allocation profiling (-Xaprof) cannot be used together with "
1845 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1846 status = false;
1847 }
1848 }
1849
1850 if (CMSIncrementalMode) {
1851 if (!UseConcMarkSweepGC) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "error: invalid argument combination.\n"
1854 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1855 "selected in order\nto use CMSIncrementalMode.\n");
1856 status = false;
1857 } else {
1858 status = status && verify_percentage(CMSIncrementalDutyCycle,
1859 "CMSIncrementalDutyCycle");
1860 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1861 "CMSIncrementalDutyCycleMin");
1862 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1863 "CMSIncrementalSafetyFactor");
1864 status = status && verify_percentage(CMSIncrementalOffset,
1865 "CMSIncrementalOffset");
1866 status = status && verify_percentage(CMSExpAvgFactor,
1867 "CMSExpAvgFactor");
1868 // If it was not set on the command line, set
1869 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1870 if (CMSInitiatingOccupancyFraction < 0) {
1871 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1872 }
1873 }
1874 }
1875
1876 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1877 // insists that we hold the requisite locks so that the iteration is
1878 // MT-safe. For the verification at start-up and shut-down, we don't
1879 // yet have a good way of acquiring and releasing these locks,
1880 // which are not visible at the CollectedHeap level. We want to
1881 // be able to acquire these locks and then do the iteration rather
1882 // than just disable the lock verification. This will be fixed under
1883 // bug 4788986.
1884 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1885 if (VerifyGCStartAt == 0) {
1886 warning("Heap verification at start-up disabled "
1887 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1888 VerifyGCStartAt = 1; // Disable verification at start-up
1889 }
1890 if (VerifyBeforeExit) {
1891 warning("Heap verification at shutdown disabled "
1892 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1893 VerifyBeforeExit = false; // Disable verification at shutdown
1894 }
1895 }
1896
1897 // Note: only executed in non-PRODUCT mode
1898 if (!UseAsyncConcMarkSweepGC &&
1899 (ExplicitGCInvokesConcurrent ||
1900 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1901 jio_fprintf(defaultStream::error_stream(),
1902 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1903 " with -UseAsyncConcMarkSweepGC");
1904 status = false;
1905 }
1906
1907 if (UseG1GC) {
1908 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1909 "InitiatingHeapOccupancyPercent");
1910 }
1911
1912 status = status && verify_interval(RefDiscoveryPolicy,
1913 ReferenceProcessor::DiscoveryPolicyMin,
1914 ReferenceProcessor::DiscoveryPolicyMax,
1915 "RefDiscoveryPolicy");
1916
1917 // Limit the lower bound of this flag to 1 as it is used in a division
1918 // expression.
1919 status = status && verify_interval(TLABWasteTargetPercent,
1920 1, 100, "TLABWasteTargetPercent");
1921
1922 status = status && verify_object_alignment();
1923
1924 return status;
1925 }
1926
1927 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1928 const char* option_type) {
1929 if (ignore) return false;
1930
1931 const char* spacer = " ";
1932 if (option_type == NULL) {
1933 option_type = ++spacer; // Set both to the empty string.
1934 }
1935
1936 if (os::obsolete_option(option)) {
1937 jio_fprintf(defaultStream::error_stream(),
1938 "Obsolete %s%soption: %s\n", option_type, spacer,
1939 option->optionString);
1940 return false;
1941 } else {
1942 jio_fprintf(defaultStream::error_stream(),
1943 "Unrecognized %s%soption: %s\n", option_type, spacer,
1944 option->optionString);
1945 return true;
1946 }
1947 }
1948
1949 static const char* user_assertion_options[] = {
1950 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1951 };
1952
1953 static const char* system_assertion_options[] = {
1954 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1955 };
1956
1957 // Return true if any of the strings in null-terminated array 'names' matches.
1958 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1959 // the option must match exactly.
1960 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1961 bool tail_allowed) {
1962 for (/* empty */; *names != NULL; ++names) {
1963 if (match_option(option, *names, tail)) {
1964 if (**tail == '\0' || tail_allowed && **tail == ':') {
1965 return true;
1966 }
1967 }
1968 }
1969 return false;
1970 }
1971
1972 bool Arguments::parse_uintx(const char* value,
1973 uintx* uintx_arg,
1974 uintx min_size) {
1975
1976 // Check the sign first since atomull() parses only unsigned values.
1977 bool value_is_positive = !(*value == '-');
1978
1979 if (value_is_positive) {
1980 julong n;
1981 bool good_return = atomull(value, &n);
1982 if (good_return) {
1983 bool above_minimum = n >= min_size;
1984 bool value_is_too_large = n > max_uintx;
1985
1986 if (above_minimum && !value_is_too_large) {
1987 *uintx_arg = n;
1988 return true;
1989 }
1990 }
1991 }
1992 return false;
1993 }
1994
1995 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1996 julong* long_arg,
1997 julong min_size) {
1998 if (!atomull(s, long_arg)) return arg_unreadable;
1999 return check_memory_size(*long_arg, min_size);
2000 }
2001
2002 // Parse JavaVMInitArgs structure
2003
2004 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2005 // For components of the system classpath.
2006 SysClassPath scp(Arguments::get_sysclasspath());
2007 bool scp_assembly_required = false;
2008
2009 // Save default settings for some mode flags
2010 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2011 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2012 Arguments::_ClipInlining = ClipInlining;
2013 Arguments::_BackgroundCompilation = BackgroundCompilation;
2014
2015 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2016 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2017 if (result != JNI_OK) {
2018 return result;
2019 }
2020
2021 // Parse JavaVMInitArgs structure passed in
2022 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2023 if (result != JNI_OK) {
2024 return result;
2025 }
2026
2027 if (AggressiveOpts) {
2028 // Insert alt-rt.jar between user-specified bootclasspath
2029 // prefix and the default bootclasspath. os::set_boot_path()
2030 // uses meta_index_dir as the default bootclasspath directory.
2031 const char* altclasses_jar = "alt-rt.jar";
2032 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2033 strlen(altclasses_jar);
2034 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2035 strcpy(altclasses_path, get_meta_index_dir());
2036 strcat(altclasses_path, altclasses_jar);
2037 scp.add_suffix_to_prefix(altclasses_path);
2038 scp_assembly_required = true;
2039 FREE_C_HEAP_ARRAY(char, altclasses_path);
2040 }
2041
2042 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2043 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2044 if (result != JNI_OK) {
2045 return result;
2046 }
2047
2048 // Do final processing now that all arguments have been parsed
2049 result = finalize_vm_init_args(&scp, scp_assembly_required);
2050 if (result != JNI_OK) {
2051 return result;
2052 }
2053
2054 return JNI_OK;
2055 }
2056
2057 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2058 SysClassPath* scp_p,
2059 bool* scp_assembly_required_p,
2060 FlagValueOrigin origin) {
2061 // Remaining part of option string
2062 const char* tail;
2063
2064 // iterate over arguments
2065 for (int index = 0; index < args->nOptions; index++) {
2066 bool is_absolute_path = false; // for -agentpath vs -agentlib
2067
2068 const JavaVMOption* option = args->options + index;
2069
2070 if (!match_option(option, "-Djava.class.path", &tail) &&
2071 !match_option(option, "-Dsun.java.command", &tail) &&
2072 !match_option(option, "-Dsun.java.launcher", &tail)) {
2073
2074 // add all jvm options to the jvm_args string. This string
2075 // is used later to set the java.vm.args PerfData string constant.
2076 // the -Djava.class.path and the -Dsun.java.command options are
2077 // omitted from jvm_args string as each have their own PerfData
2078 // string constant object.
2079 build_jvm_args(option->optionString);
2080 }
2081
2082 // -verbose:[class/gc/jni]
2083 if (match_option(option, "-verbose", &tail)) {
2084 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2085 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2086 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2087 } else if (!strcmp(tail, ":gc")) {
2088 FLAG_SET_CMDLINE(bool, PrintGC, true);
2089 } else if (!strcmp(tail, ":jni")) {
2090 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2091 }
2092 // -da / -ea / -disableassertions / -enableassertions
2093 // These accept an optional class/package name separated by a colon, e.g.,
2094 // -da:java.lang.Thread.
2095 } else if (match_option(option, user_assertion_options, &tail, true)) {
2096 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2097 if (*tail == '\0') {
2098 JavaAssertions::setUserClassDefault(enable);
2099 } else {
2100 assert(*tail == ':', "bogus match by match_option()");
2101 JavaAssertions::addOption(tail + 1, enable);
2102 }
2103 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2104 } else if (match_option(option, system_assertion_options, &tail, false)) {
2105 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2106 JavaAssertions::setSystemClassDefault(enable);
2107 // -bootclasspath:
2108 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2109 scp_p->reset_path(tail);
2110 *scp_assembly_required_p = true;
2111 // -bootclasspath/a:
2112 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2113 scp_p->add_suffix(tail);
2114 *scp_assembly_required_p = true;
2115 // -bootclasspath/p:
2116 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2117 scp_p->add_prefix(tail);
2118 *scp_assembly_required_p = true;
2119 // -Xrun
2120 } else if (match_option(option, "-Xrun", &tail)) {
2121 if (tail != NULL) {
2122 const char* pos = strchr(tail, ':');
2123 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2124 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2125 name[len] = '\0';
2126
2127 char *options = NULL;
2128 if(pos != NULL) {
2129 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2130 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2131 }
2132 #ifdef JVMTI_KERNEL
2133 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2134 warning("profiling and debugging agents are not supported with Kernel VM");
2135 } else
2136 #endif // JVMTI_KERNEL
2137 add_init_library(name, options);
2138 }
2139 // -agentlib and -agentpath
2140 } else if (match_option(option, "-agentlib:", &tail) ||
2141 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2142 if(tail != NULL) {
2143 const char* pos = strchr(tail, '=');
2144 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2145 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2146 name[len] = '\0';
2147
2148 char *options = NULL;
2149 if(pos != NULL) {
2150 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2151 }
2152 #ifdef JVMTI_KERNEL
2153 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2154 warning("profiling and debugging agents are not supported with Kernel VM");
2155 } else
2156 #endif // JVMTI_KERNEL
2157 add_init_agent(name, options, is_absolute_path);
2158
2159 }
2160 // -javaagent
2161 } else if (match_option(option, "-javaagent:", &tail)) {
2162 if(tail != NULL) {
2163 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2164 add_init_agent("instrument", options, false);
2165 }
2166 // -Xnoclassgc
2167 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2168 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2169 // -Xincgc: i-CMS
2170 } else if (match_option(option, "-Xincgc", &tail)) {
2171 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2172 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2173 // -Xnoincgc: no i-CMS
2174 } else if (match_option(option, "-Xnoincgc", &tail)) {
2175 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2176 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2177 // -Xconcgc
2178 } else if (match_option(option, "-Xconcgc", &tail)) {
2179 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2180 // -Xnoconcgc
2181 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2182 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2183 // -Xbatch
2184 } else if (match_option(option, "-Xbatch", &tail)) {
2185 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2186 // -Xmn for compatibility with other JVM vendors
2187 } else if (match_option(option, "-Xmn", &tail)) {
2188 julong long_initial_eden_size = 0;
2189 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2190 if (errcode != arg_in_range) {
2191 jio_fprintf(defaultStream::error_stream(),
2192 "Invalid initial eden size: %s\n", option->optionString);
2193 describe_range_error(errcode);
2194 return JNI_EINVAL;
2195 }
2196 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2197 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2198 // -Xms
2199 } else if (match_option(option, "-Xms", &tail)) {
2200 julong long_initial_heap_size = 0;
2201 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2202 if (errcode != arg_in_range) {
2203 jio_fprintf(defaultStream::error_stream(),
2204 "Invalid initial heap size: %s\n", option->optionString);
2205 describe_range_error(errcode);
2206 return JNI_EINVAL;
2207 }
2208 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2209 // Currently the minimum size and the initial heap sizes are the same.
2210 set_min_heap_size(InitialHeapSize);
2211 // -Xmx
2212 } else if (match_option(option, "-Xmx", &tail)) {
2213 julong long_max_heap_size = 0;
2214 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2215 if (errcode != arg_in_range) {
2216 jio_fprintf(defaultStream::error_stream(),
2217 "Invalid maximum heap size: %s\n", option->optionString);
2218 describe_range_error(errcode);
2219 return JNI_EINVAL;
2220 }
2221 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2222 // Xmaxf
2223 } else if (match_option(option, "-Xmaxf", &tail)) {
2224 int maxf = (int)(atof(tail) * 100);
2225 if (maxf < 0 || maxf > 100) {
2226 jio_fprintf(defaultStream::error_stream(),
2227 "Bad max heap free percentage size: %s\n",
2228 option->optionString);
2229 return JNI_EINVAL;
2230 } else {
2231 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2232 }
2233 // Xminf
2234 } else if (match_option(option, "-Xminf", &tail)) {
2235 int minf = (int)(atof(tail) * 100);
2236 if (minf < 0 || minf > 100) {
2237 jio_fprintf(defaultStream::error_stream(),
2238 "Bad min heap free percentage size: %s\n",
2239 option->optionString);
2240 return JNI_EINVAL;
2241 } else {
2242 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2243 }
2244 // -Xss
2245 } else if (match_option(option, "-Xss", &tail)) {
2246 julong long_ThreadStackSize = 0;
2247 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2248 if (errcode != arg_in_range) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Invalid thread stack size: %s\n", option->optionString);
2251 describe_range_error(errcode);
2252 return JNI_EINVAL;
2253 }
2254 // Internally track ThreadStackSize in units of 1024 bytes.
2255 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2256 round_to((int)long_ThreadStackSize, K) / K);
2257 // -Xoss
2258 } else if (match_option(option, "-Xoss", &tail)) {
2259 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2260 // -Xmaxjitcodesize
2261 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2262 julong long_ReservedCodeCacheSize = 0;
2263 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2264 (size_t)InitialCodeCacheSize);
2265 if (errcode != arg_in_range) {
2266 jio_fprintf(defaultStream::error_stream(),
2267 "Invalid maximum code cache size: %s\n",
2268 option->optionString);
2269 describe_range_error(errcode);
2270 return JNI_EINVAL;
2271 }
2272 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2273 // -green
2274 } else if (match_option(option, "-green", &tail)) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "Green threads support not available\n");
2277 return JNI_EINVAL;
2278 // -native
2279 } else if (match_option(option, "-native", &tail)) {
2280 // HotSpot always uses native threads, ignore silently for compatibility
2281 // -Xsqnopause
2282 } else if (match_option(option, "-Xsqnopause", &tail)) {
2283 // EVM option, ignore silently for compatibility
2284 // -Xrs
2285 } else if (match_option(option, "-Xrs", &tail)) {
2286 // Classic/EVM option, new functionality
2287 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2288 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2289 // change default internal VM signals used - lower case for back compat
2290 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2291 // -Xoptimize
2292 } else if (match_option(option, "-Xoptimize", &tail)) {
2293 // EVM option, ignore silently for compatibility
2294 // -Xprof
2295 } else if (match_option(option, "-Xprof", &tail)) {
2296 #ifndef FPROF_KERNEL
2297 _has_profile = true;
2298 #else // FPROF_KERNEL
2299 // do we have to exit?
2300 warning("Kernel VM does not support flat profiling.");
2301 #endif // FPROF_KERNEL
2302 // -Xaprof
2303 } else if (match_option(option, "-Xaprof", &tail)) {
2304 _has_alloc_profile = true;
2305 // -Xconcurrentio
2306 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2307 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2308 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2309 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2310 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2311 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2312
2313 // -Xinternalversion
2314 } else if (match_option(option, "-Xinternalversion", &tail)) {
2315 jio_fprintf(defaultStream::output_stream(), "%s\n",
2316 VM_Version::internal_vm_info_string());
2317 vm_exit(0);
2318 #ifndef PRODUCT
2319 // -Xprintflags
2320 } else if (match_option(option, "-Xprintflags", &tail)) {
2321 CommandLineFlags::printFlags();
2322 vm_exit(0);
2323 #endif
2324 // -D
2325 } else if (match_option(option, "-D", &tail)) {
2326 if (!add_property(tail)) {
2327 return JNI_ENOMEM;
2328 }
2329 // Out of the box management support
2330 if (match_option(option, "-Dcom.sun.management", &tail)) {
2331 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2332 }
2333 // -Xint
2334 } else if (match_option(option, "-Xint", &tail)) {
2335 set_mode_flags(_int);
2336 // -Xmixed
2337 } else if (match_option(option, "-Xmixed", &tail)) {
2338 set_mode_flags(_mixed);
2339 // -Xcomp
2340 } else if (match_option(option, "-Xcomp", &tail)) {
2341 // for testing the compiler; turn off all flags that inhibit compilation
2342 set_mode_flags(_comp);
2343
2344 // -Xshare:dump
2345 } else if (match_option(option, "-Xshare:dump", &tail)) {
2346 #ifdef TIERED
2347 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2348 set_mode_flags(_int); // Prevent compilation, which creates objects
2349 #elif defined(COMPILER2)
2350 vm_exit_during_initialization(
2351 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2352 #elif defined(KERNEL)
2353 vm_exit_during_initialization(
2354 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2355 #else
2356 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2357 set_mode_flags(_int); // Prevent compilation, which creates objects
2358 #endif
2359 // -Xshare:on
2360 } else if (match_option(option, "-Xshare:on", &tail)) {
2361 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2362 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2363 #ifdef TIERED
2364 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2365 #endif // TIERED
2366 // -Xshare:auto
2367 } else if (match_option(option, "-Xshare:auto", &tail)) {
2368 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2369 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2370 // -Xshare:off
2371 } else if (match_option(option, "-Xshare:off", &tail)) {
2372 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2373 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2374
2375 // -Xverify
2376 } else if (match_option(option, "-Xverify", &tail)) {
2377 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2378 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2379 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2380 } else if (strcmp(tail, ":remote") == 0) {
2381 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2382 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2383 } else if (strcmp(tail, ":none") == 0) {
2384 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2385 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2386 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2387 return JNI_EINVAL;
2388 }
2389 // -Xdebug
2390 } else if (match_option(option, "-Xdebug", &tail)) {
2391 // note this flag has been used, then ignore
2392 set_xdebug_mode(true);
2393 // -Xnoagent
2394 } else if (match_option(option, "-Xnoagent", &tail)) {
2395 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2396 } else if (match_option(option, "-Xboundthreads", &tail)) {
2397 // Bind user level threads to kernel threads (Solaris only)
2398 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2399 } else if (match_option(option, "-Xloggc:", &tail)) {
2400 // Redirect GC output to the file. -Xloggc:<filename>
2401 // ostream_init_log(), when called will use this filename
2402 // to initialize a fileStream.
2403 _gc_log_filename = strdup(tail);
2404 FLAG_SET_CMDLINE(bool, PrintGC, true);
2405 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2406 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2407
2408 // JNI hooks
2409 } else if (match_option(option, "-Xcheck", &tail)) {
2410 if (!strcmp(tail, ":jni")) {
2411 CheckJNICalls = true;
2412 } else if (is_bad_option(option, args->ignoreUnrecognized,
2413 "check")) {
2414 return JNI_EINVAL;
2415 }
2416 } else if (match_option(option, "vfprintf", &tail)) {
2417 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2418 } else if (match_option(option, "exit", &tail)) {
2419 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2420 } else if (match_option(option, "abort", &tail)) {
2421 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2422 // -XX:+AggressiveHeap
2423 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2424
2425 // This option inspects the machine and attempts to set various
2426 // parameters to be optimal for long-running, memory allocation
2427 // intensive jobs. It is intended for machines with large
2428 // amounts of cpu and memory.
2429
2430 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2431 // VM, but we may not be able to represent the total physical memory
2432 // available (like having 8gb of memory on a box but using a 32bit VM).
2433 // Thus, we need to make sure we're using a julong for intermediate
2434 // calculations.
2435 julong initHeapSize;
2436 julong total_memory = os::physical_memory();
2437
2438 if (total_memory < (julong)256*M) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2441 vm_exit(1);
2442 }
2443
2444 // The heap size is half of available memory, or (at most)
2445 // all of possible memory less 160mb (leaving room for the OS
2446 // when using ISM). This is the maximum; because adaptive sizing
2447 // is turned on below, the actual space used may be smaller.
2448
2449 initHeapSize = MIN2(total_memory / (julong)2,
2450 total_memory - (julong)160*M);
2451
2452 // Make sure that if we have a lot of memory we cap the 32 bit
2453 // process space. The 64bit VM version of this function is a nop.
2454 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2455
2456 // The perm gen is separate but contiguous with the
2457 // object heap (and is reserved with it) so subtract it
2458 // from the heap size.
2459 if (initHeapSize > MaxPermSize) {
2460 initHeapSize = initHeapSize - MaxPermSize;
2461 } else {
2462 warning("AggressiveHeap and MaxPermSize values may conflict");
2463 }
2464
2465 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2466 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2467 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2468 // Currently the minimum size and the initial heap sizes are the same.
2469 set_min_heap_size(initHeapSize);
2470 }
2471 if (FLAG_IS_DEFAULT(NewSize)) {
2472 // Make the young generation 3/8ths of the total heap.
2473 FLAG_SET_CMDLINE(uintx, NewSize,
2474 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2475 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2476 }
2477
2478 FLAG_SET_DEFAULT(UseLargePages, true);
2479
2480 // Increase some data structure sizes for efficiency
2481 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2482 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2483 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2484
2485 // See the OldPLABSize comment below, but replace 'after promotion'
2486 // with 'after copying'. YoungPLABSize is the size of the survivor
2487 // space per-gc-thread buffers. The default is 4kw.
2488 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2489
2490 // OldPLABSize is the size of the buffers in the old gen that
2491 // UseParallelGC uses to promote live data that doesn't fit in the
2492 // survivor spaces. At any given time, there's one for each gc thread.
2493 // The default size is 1kw. These buffers are rarely used, since the
2494 // survivor spaces are usually big enough. For specjbb, however, there
2495 // are occasions when there's lots of live data in the young gen
2496 // and we end up promoting some of it. We don't have a definite
2497 // explanation for why bumping OldPLABSize helps, but the theory
2498 // is that a bigger PLAB results in retaining something like the
2499 // original allocation order after promotion, which improves mutator
2500 // locality. A minor effect may be that larger PLABs reduce the
2501 // number of PLAB allocation events during gc. The value of 8kw
2502 // was arrived at by experimenting with specjbb.
2503 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2504
2505 // CompilationPolicyChoice=0 causes the server compiler to adopt
2506 // a more conservative which-method-do-I-compile policy when one
2507 // of the counters maintained by the interpreter trips. The
2508 // result is reduced startup time and improved specjbb and
2509 // alacrity performance. Zero is the default, but we set it
2510 // explicitly here in case the default changes.
2511 // See runtime/compilationPolicy.*.
2512 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2513
2514 // Enable parallel GC and adaptive generation sizing
2515 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2516 FLAG_SET_DEFAULT(ParallelGCThreads,
2517 Abstract_VM_Version::parallel_worker_threads());
2518
2519 // Encourage steady state memory management
2520 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2521
2522 // This appears to improve mutator locality
2523 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2524
2525 // Get around early Solaris scheduling bug
2526 // (affinity vs other jobs on system)
2527 // but disallow DR and offlining (5008695).
2528 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2529
2530 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2531 // The last option must always win.
2532 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2533 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2534 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2535 // The last option must always win.
2536 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2537 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2538 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2539 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2540 jio_fprintf(defaultStream::error_stream(),
2541 "Please use CMSClassUnloadingEnabled in place of "
2542 "CMSPermGenSweepingEnabled in the future\n");
2543 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2544 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Please use -XX:+UseGCOverheadLimit in place of "
2547 "-XX:+UseGCTimeLimit in the future\n");
2548 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2549 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Please use -XX:-UseGCOverheadLimit in place of "
2552 "-XX:-UseGCTimeLimit in the future\n");
2553 // The TLE options are for compatibility with 1.3 and will be
2554 // removed without notice in a future release. These options
2555 // are not to be documented.
2556 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2557 // No longer used.
2558 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2559 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2560 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2561 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2562 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2563 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2564 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2565 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2566 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2567 // No longer used.
2568 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2569 julong long_tlab_size = 0;
2570 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2571 if (errcode != arg_in_range) {
2572 jio_fprintf(defaultStream::error_stream(),
2573 "Invalid TLAB size: %s\n", option->optionString);
2574 describe_range_error(errcode);
2575 return JNI_EINVAL;
2576 }
2577 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2578 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2579 // No longer used.
2580 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2581 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2582 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2583 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2584 SOLARIS_ONLY(
2585 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2586 warning("-XX:+UsePermISM is obsolete.");
2587 FLAG_SET_CMDLINE(bool, UseISM, true);
2588 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2589 FLAG_SET_CMDLINE(bool, UseISM, false);
2590 )
2591 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2592 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2593 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2594 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2595 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2596 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2597 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2598 #ifdef SOLARIS
2599 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2600 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2601 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2602 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2603 #else // ndef SOLARIS
2604 jio_fprintf(defaultStream::error_stream(),
2605 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2606 return JNI_EINVAL;
2607 #endif // ndef SOLARIS
2608 #ifdef ASSERT
2609 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2610 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2611 // disable scavenge before parallel mark-compact
2612 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2613 #endif
2614 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2615 julong cms_blocks_to_claim = (julong)atol(tail);
2616 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2617 jio_fprintf(defaultStream::error_stream(),
2618 "Please use -XX:OldPLABSize in place of "
2619 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2620 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2621 julong cms_blocks_to_claim = (julong)atol(tail);
2622 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2623 jio_fprintf(defaultStream::error_stream(),
2624 "Please use -XX:OldPLABSize in place of "
2625 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2626 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2627 julong old_plab_size = 0;
2628 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2629 if (errcode != arg_in_range) {
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Invalid old PLAB size: %s\n", option->optionString);
2632 describe_range_error(errcode);
2633 return JNI_EINVAL;
2634 }
2635 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Please use -XX:OldPLABSize in place of "
2638 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2639 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2640 julong young_plab_size = 0;
2641 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2642 if (errcode != arg_in_range) {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Invalid young PLAB size: %s\n", option->optionString);
2645 describe_range_error(errcode);
2646 return JNI_EINVAL;
2647 }
2648 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2649 jio_fprintf(defaultStream::error_stream(),
2650 "Please use -XX:YoungPLABSize in place of "
2651 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2652 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2653 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2654 julong stack_size = 0;
2655 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2656 if (errcode != arg_in_range) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Invalid mark stack size: %s\n", option->optionString);
2659 describe_range_error(errcode);
2660 return JNI_EINVAL;
2661 }
2662 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2663 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2664 julong max_stack_size = 0;
2665 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2666 if (errcode != arg_in_range) {
2667 jio_fprintf(defaultStream::error_stream(),
2668 "Invalid maximum mark stack size: %s\n",
2669 option->optionString);
2670 describe_range_error(errcode);
2671 return JNI_EINVAL;
2672 }
2673 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2674 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2675 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2676 uintx conc_threads = 0;
2677 if (!parse_uintx(tail, &conc_threads, 1)) {
2678 jio_fprintf(defaultStream::error_stream(),
2679 "Invalid concurrent threads: %s\n", option->optionString);
2680 return JNI_EINVAL;
2681 }
2682 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2683 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2684 // Skip -XX:Flags= since that case has already been handled
2685 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2686 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2687 return JNI_EINVAL;
2688 }
2689 }
2690 // Unknown option
2691 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2692 return JNI_ERR;
2693 }
2694 }
2695 // Change the default value for flags which have different default values
2696 // when working with older JDKs.
2697 if (JDK_Version::current().compare_major(6) <= 0 &&
2698 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2699 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2700 }
2701 #ifdef LINUX
2702 if (JDK_Version::current().compare_major(6) <= 0 &&
2703 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2704 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2705 }
2706 #endif // LINUX
2707 return JNI_OK;
2708 }
2709
2710 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2711 // This must be done after all -D arguments have been processed.
2712 scp_p->expand_endorsed();
2713
2714 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2715 // Assemble the bootclasspath elements into the final path.
2716 Arguments::set_sysclasspath(scp_p->combined_path());
2717 }
2718
2719 // This must be done after all arguments have been processed.
2720 // java_compiler() true means set to "NONE" or empty.
2721 if (java_compiler() && !xdebug_mode()) {
2722 // For backwards compatibility, we switch to interpreted mode if
2723 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2724 // not specified.
2725 set_mode_flags(_int);
2726 }
2727 if (CompileThreshold == 0) {
2728 set_mode_flags(_int);
2729 }
2730
2731 #ifndef COMPILER2
2732 // Don't degrade server performance for footprint
2733 if (FLAG_IS_DEFAULT(UseLargePages) &&
2734 MaxHeapSize < LargePageHeapSizeThreshold) {
2735 // No need for large granularity pages w/small heaps.
2736 // Note that large pages are enabled/disabled for both the
2737 // Java heap and the code cache.
2738 FLAG_SET_DEFAULT(UseLargePages, false);
2739 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2740 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2741 }
2742
2743 // Tiered compilation is undefined with C1.
2744 TieredCompilation = false;
2745 #else
2746 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2747 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2748 }
2749 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2750 if (UseG1GC) {
2751 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2752 }
2753 #endif
2754
2755 // If we are running in a headless jre, force java.awt.headless property
2756 // to be true unless the property has already been set.
2757 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2758 if (os::is_headless_jre()) {
2759 const char* headless = Arguments::get_property("java.awt.headless");
2760 if (headless == NULL) {
2761 char envbuffer[128];
2762 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2763 if (!add_property("java.awt.headless=true")) {
2764 return JNI_ENOMEM;
2765 }
2766 } else {
2767 char buffer[256];
2768 strcpy(buffer, "java.awt.headless=");
2769 strcat(buffer, envbuffer);
2770 if (!add_property(buffer)) {
2771 return JNI_ENOMEM;
2772 }
2773 }
2774 }
2775 }
2776
2777 if (!check_vm_args_consistency()) {
2778 return JNI_ERR;
2779 }
2780
2781 return JNI_OK;
2782 }
2783
2784 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2785 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2786 scp_assembly_required_p);
2787 }
2788
2789 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2790 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2791 scp_assembly_required_p);
2792 }
2793
2794 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2795 const int N_MAX_OPTIONS = 64;
2796 const int OPTION_BUFFER_SIZE = 1024;
2797 char buffer[OPTION_BUFFER_SIZE];
2798
2799 // The variable will be ignored if it exceeds the length of the buffer.
2800 // Don't check this variable if user has special privileges
2801 // (e.g. unix su command).
2802 if (os::getenv(name, buffer, sizeof(buffer)) &&
2803 !os::have_special_privileges()) {
2804 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Picked up %s: %s\n", name, buffer);
2807 char* rd = buffer; // pointer to the input string (rd)
2808 int i;
2809 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2810 while (isspace(*rd)) rd++; // skip whitespace
2811 if (*rd == 0) break; // we re done when the input string is read completely
2812
2813 // The output, option string, overwrites the input string.
2814 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2815 // input string (rd).
2816 char* wrt = rd;
2817
2818 options[i++].optionString = wrt; // Fill in option
2819 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2820 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2821 int quote = *rd; // matching quote to look for
2822 rd++; // don't copy open quote
2823 while (*rd != quote) { // include everything (even spaces) up until quote
2824 if (*rd == 0) { // string termination means unmatched string
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Unmatched quote in %s\n", name);
2827 return JNI_ERR;
2828 }
2829 *wrt++ = *rd++; // copy to option string
2830 }
2831 rd++; // don't copy close quote
2832 } else {
2833 *wrt++ = *rd++; // copy to option string
2834 }
2835 }
2836 // Need to check if we're done before writing a NULL,
2837 // because the write could be to the byte that rd is pointing to.
2838 if (*rd++ == 0) {
2839 *wrt = 0;
2840 break;
2841 }
2842 *wrt = 0; // Zero terminate option
2843 }
2844 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2845 JavaVMInitArgs vm_args;
2846 vm_args.version = JNI_VERSION_1_2;
2847 vm_args.options = options;
2848 vm_args.nOptions = i;
2849 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2850
2851 if (PrintVMOptions) {
2852 const char* tail;
2853 for (int i = 0; i < vm_args.nOptions; i++) {
2854 const JavaVMOption *option = vm_args.options + i;
2855 if (match_option(option, "-XX:", &tail)) {
2856 logOption(tail);
2857 }
2858 }
2859 }
2860
2861 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2862 }
2863 return JNI_OK;
2864 }
2865
2866
2867 // Parse entry point called from JNI_CreateJavaVM
2868
2869 jint Arguments::parse(const JavaVMInitArgs* args) {
2870
2871 // Sharing support
2872 // Construct the path to the archive
2873 char jvm_path[JVM_MAXPATHLEN];
2874 os::jvm_path(jvm_path, sizeof(jvm_path));
2875 #ifdef TIERED
2876 if (strstr(jvm_path, "client") != NULL) {
2877 force_client_mode = true;
2878 }
2879 #endif // TIERED
2880 char *end = strrchr(jvm_path, *os::file_separator());
2881 if (end != NULL) *end = '\0';
2882 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2883 strlen(os::file_separator()) + 20);
2884 if (shared_archive_path == NULL) return JNI_ENOMEM;
2885 strcpy(shared_archive_path, jvm_path);
2886 strcat(shared_archive_path, os::file_separator());
2887 strcat(shared_archive_path, "classes");
2888 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2889 strcat(shared_archive_path, ".jsa");
2890 SharedArchivePath = shared_archive_path;
2891
2892 // Remaining part of option string
2893 const char* tail;
2894
2895 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2896 bool settings_file_specified = false;
2897 const char* flags_file;
2898 int index;
2899 for (index = 0; index < args->nOptions; index++) {
2900 const JavaVMOption *option = args->options + index;
2901 if (match_option(option, "-XX:Flags=", &tail)) {
2902 flags_file = tail;
2903 settings_file_specified = true;
2904 }
2905 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2906 PrintVMOptions = true;
2907 }
2908 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2909 PrintVMOptions = false;
2910 }
2911 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2912 IgnoreUnrecognizedVMOptions = true;
2913 }
2914 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2915 IgnoreUnrecognizedVMOptions = false;
2916 }
2917 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2918 CommandLineFlags::printFlags();
2919 vm_exit(0);
2920 }
2921
2922 #ifndef PRODUCT
2923 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2924 CommandLineFlags::printFlags(true);
2925 vm_exit(0);
2926 }
2927 #endif
2928 }
2929
2930 if (IgnoreUnrecognizedVMOptions) {
2931 // uncast const to modify the flag args->ignoreUnrecognized
2932 *(jboolean*)(&args->ignoreUnrecognized) = true;
2933 }
2934
2935 // Parse specified settings file
2936 if (settings_file_specified) {
2937 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2938 return JNI_EINVAL;
2939 }
2940 }
2941
2942 // Parse default .hotspotrc settings file
2943 if (!settings_file_specified) {
2944 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2945 return JNI_EINVAL;
2946 }
2947 }
2948
2949 if (PrintVMOptions) {
2950 for (index = 0; index < args->nOptions; index++) {
2951 const JavaVMOption *option = args->options + index;
2952 if (match_option(option, "-XX:", &tail)) {
2953 logOption(tail);
2954 }
2955 }
2956 }
2957
2958 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2959 jint result = parse_vm_init_args(args);
2960 if (result != JNI_OK) {
2961 return result;
2962 }
2963
2964 #ifndef PRODUCT
2965 if (TraceBytecodesAt != 0) {
2966 TraceBytecodes = true;
2967 }
2968 if (CountCompiledCalls) {
2969 if (UseCounterDecay) {
2970 warning("UseCounterDecay disabled because CountCalls is set");
2971 UseCounterDecay = false;
2972 }
2973 }
2974 #endif // PRODUCT
2975
2976 if (EnableInvokeDynamic && !EnableMethodHandles) {
2977 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2978 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2979 }
2980 EnableMethodHandles = true;
2981 }
2982 if (EnableMethodHandles && !AnonymousClasses) {
2983 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2984 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2985 }
2986 AnonymousClasses = true;
2987 }
2988 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2989 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2990 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2991 }
2992 ScavengeRootsInCode = 1;
2993 }
2994 #ifdef COMPILER2
2995 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2996 // TODO: We need to find rules for invokedynamic and EA. For now,
2997 // simply disable EA by default.
2998 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2999 DoEscapeAnalysis = false;
3000 }
3001 }
3002 #endif
3003
3004 if (PrintGCDetails) {
3005 // Turn on -verbose:gc options as well
3006 PrintGC = true;
3007 }
3008
3009 // Set object alignment values.
3010 set_object_alignment();
3011
3012 #ifdef SERIALGC
3013 force_serial_gc();
3014 #endif // SERIALGC
3015 #ifdef KERNEL
3016 no_shared_spaces();
3017 #endif // KERNEL
3018
3019 // Set flags based on ergonomics.
3020 set_ergonomics_flags();
3021
3022 #ifdef _LP64
3023 if (UseCompressedOops) {
3024 check_compressed_oops_compat();
3025 }
3026 #endif
3027
3028 // Check the GC selections again.
3029 if (!check_gc_consistency()) {
3030 return JNI_EINVAL;
3031 }
3032
3033 if (TieredCompilation) {
3034 set_tiered_flags();
3035 } else {
3036 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3037 if (CompilationPolicyChoice >= 2) {
3038 vm_exit_during_initialization(
3039 "Incompatible compilation policy selected", NULL);
3040 }
3041 }
3042
3043 #ifndef KERNEL
3044 if (UseConcMarkSweepGC) {
3045 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3046 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3047 // are true, we don't call set_parnew_gc_flags() as well.
3048 set_cms_and_parnew_gc_flags();
3049 } else {
3050 // Set heap size based on available physical memory
3051 set_heap_size();
3052 // Set per-collector flags
3053 if (UseParallelGC || UseParallelOldGC) {
3054 set_parallel_gc_flags();
3055 } else if (UseParNewGC) {
3056 set_parnew_gc_flags();
3057 } else if (UseG1GC) {
3058 set_g1_gc_flags();
3059 }
3060 }
3061 #endif // KERNEL
3062
3063 #ifdef SERIALGC
3064 assert(verify_serial_gc_flags(), "SerialGC unset");
3065 #endif // SERIALGC
3066
3067 // Set bytecode rewriting flags
3068 set_bytecode_flags();
3069
3070 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3071 set_aggressive_opts_flags();
3072
3073 #ifdef CC_INTERP
3074 // Clear flags not supported by the C++ interpreter
3075 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3076 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3077 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3078 #endif // CC_INTERP
3079
3080 #ifdef COMPILER2
3081 if (!UseBiasedLocking || EmitSync != 0) {
3082 UseOptoBiasInlining = false;
3083 }
3084 #endif
3085
3086 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3087 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3088 DebugNonSafepoints = true;
3089 }
3090
3091 #ifndef PRODUCT
3092 if (CompileTheWorld) {
3093 // Force NmethodSweeper to sweep whole CodeCache each time.
3094 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3095 NmethodSweepFraction = 1;
3096 }
3097 }
3098 #endif
3099
3100 if (PrintCommandLineFlags) {
3101 CommandLineFlags::printSetFlags();
3102 }
3103
3104 // Apply CPU specific policy for the BiasedLocking
3105 if (UseBiasedLocking) {
3106 if (!VM_Version::use_biased_locking() &&
3107 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3108 UseBiasedLocking = false;
3109 }
3110 }
3111
3112 return JNI_OK;
3113 }
3114
3115 int Arguments::PropertyList_count(SystemProperty* pl) {
3116 int count = 0;
3117 while(pl != NULL) {
3118 count++;
3119 pl = pl->next();
3120 }
3121 return count;
3122 }
3123
3124 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3125 assert(key != NULL, "just checking");
3126 SystemProperty* prop;
3127 for (prop = pl; prop != NULL; prop = prop->next()) {
3128 if (strcmp(key, prop->key()) == 0) return prop->value();
3129 }
3130 return NULL;
3131 }
3132
3133 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3134 int count = 0;
3135 const char* ret_val = NULL;
3136
3137 while(pl != NULL) {
3138 if(count >= index) {
3139 ret_val = pl->key();
3140 break;
3141 }
3142 count++;
3143 pl = pl->next();
3144 }
3145
3146 return ret_val;
3147 }
3148
3149 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3150 int count = 0;
3151 char* ret_val = NULL;
3152
3153 while(pl != NULL) {
3154 if(count >= index) {
3155 ret_val = pl->value();
3156 break;
3157 }
3158 count++;
3159 pl = pl->next();
3160 }
3161
3162 return ret_val;
3163 }
3164
3165 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3166 SystemProperty* p = *plist;
3167 if (p == NULL) {
3168 *plist = new_p;
3169 } else {
3170 while (p->next() != NULL) {
3171 p = p->next();
3172 }
3173 p->set_next(new_p);
3174 }
3175 }
3176
3177 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3178 if (plist == NULL)
3179 return;
3180
3181 SystemProperty* new_p = new SystemProperty(k, v, true);
3182 PropertyList_add(plist, new_p);
3183 }
3184
3185 // This add maintains unique property key in the list.
3186 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3187 if (plist == NULL)
3188 return;
3189
3190 // If property key exist then update with new value.
3191 SystemProperty* prop;
3192 for (prop = *plist; prop != NULL; prop = prop->next()) {
3193 if (strcmp(k, prop->key()) == 0) {
3194 if (append) {
3195 prop->append_value(v);
3196 } else {
3197 prop->set_value(v);
3198 }
3199 return;
3200 }
3201 }
3202
3203 PropertyList_add(plist, k, v);
3204 }
3205
3206 #ifdef KERNEL
3207 char *Arguments::get_kernel_properties() {
3208 // Find properties starting with kernel and append them to string
3209 // We need to find out how long they are first because the URL's that they
3210 // might point to could get long.
3211 int length = 0;
3212 SystemProperty* prop;
3213 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3214 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3215 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3216 }
3217 }
3218 // Add one for null terminator.
3219 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3220 if (length != 0) {
3221 int pos = 0;
3222 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3223 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3224 jio_snprintf(&props[pos], length-pos,
3225 "-D%s=%s ", prop->key(), prop->value());
3226 pos = strlen(props);
3227 }
3228 }
3229 }
3230 // null terminate props in case of null
3231 props[length] = '\0';
3232 return props;
3233 }
3234 #endif // KERNEL
3235
3236 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3237 // Returns true if all of the source pointed by src has been copied over to
3238 // the destination buffer pointed by buf. Otherwise, returns false.
3239 // Notes:
3240 // 1. If the length (buflen) of the destination buffer excluding the
3241 // NULL terminator character is not long enough for holding the expanded
3242 // pid characters, it also returns false instead of returning the partially
3243 // expanded one.
3244 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3245 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3246 char* buf, size_t buflen) {
3247 const char* p = src;
3248 char* b = buf;
3249 const char* src_end = &src[srclen];
3250 char* buf_end = &buf[buflen - 1];
3251
3252 while (p < src_end && b < buf_end) {
3253 if (*p == '%') {
3254 switch (*(++p)) {
3255 case '%': // "%%" ==> "%"
3256 *b++ = *p++;
3257 break;
3258 case 'p': { // "%p" ==> current process id
3259 // buf_end points to the character before the last character so
3260 // that we could write '\0' to the end of the buffer.
3261 size_t buf_sz = buf_end - b + 1;
3262 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3263
3264 // if jio_snprintf fails or the buffer is not long enough to hold
3265 // the expanded pid, returns false.
3266 if (ret < 0 || ret >= (int)buf_sz) {
3267 return false;
3268 } else {
3269 b += ret;
3270 assert(*b == '\0', "fail in copy_expand_pid");
3271 if (p == src_end && b == buf_end + 1) {
3272 // reach the end of the buffer.
3273 return true;
3274 }
3275 }
3276 p++;
3277 break;
3278 }
3279 default :
3280 *b++ = '%';
3281 }
3282 } else {
3283 *b++ = *p++;
3284 }
3285 }
3286 *b = '\0';
3287 return (p == src_end); // return false if not all of the source was copied
3288 }