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.name",
120 "Java Virtual Machine Specification", false));
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
124
125 // following are JVMTI agent writeable properties.
126 // Properties values are set to NULL and they are
127 // os specific they are initialized in os::init_system_properties_values().
128 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
129 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
130 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
131 _java_library_path = new SystemProperty("java.library.path", NULL, true);
132 _java_home = new SystemProperty("java.home", NULL, true);
133 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
134
135 _java_class_path = new SystemProperty("java.class.path", "", true);
136
137 // Add to System Property list.
138 PropertyList_add(&_system_properties, _java_ext_dirs);
139 PropertyList_add(&_system_properties, _java_endorsed_dirs);
140 PropertyList_add(&_system_properties, _sun_boot_library_path);
141 PropertyList_add(&_system_properties, _java_library_path);
142 PropertyList_add(&_system_properties, _java_home);
143 PropertyList_add(&_system_properties, _java_class_path);
144 PropertyList_add(&_system_properties, _sun_boot_class_path);
145
146 // Set OS specific system properties values
147 os::init_system_properties_values();
148 }
149
150
151 // Update/Initialize System properties after JDK version number is known
152 void Arguments::init_version_specific_system_properties() {
153 enum { bufsz = 16 };
154 char buffer[bufsz];
155 const char* spec_vendor = "Sun Microsystems Inc.";
156 uint32_t spec_version = 0;
157
158 if (JDK_Version::is_gte_jdk17x_version()) {
159 spec_vendor = "Oracle Corporation";
160 spec_version = JDK_Version::current().major_version();
161 }
162 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
163
164 PropertyList_add(&_system_properties,
165 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
166 PropertyList_add(&_system_properties,
167 new SystemProperty("java.vm.specification.version", buffer, false));
168 PropertyList_add(&_system_properties,
169 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
170 }
171
172 /**
173 * Provide a slightly more user-friendly way of eliminating -XX flags.
174 * When a flag is eliminated, it can be added to this list in order to
175 * continue accepting this flag on the command-line, while issuing a warning
176 * and ignoring the value. Once the JDK version reaches the 'accept_until'
177 * limit, we flatly refuse to admit the existence of the flag. This allows
178 * a flag to die correctly over JDK releases using HSX.
179 */
180 typedef struct {
181 const char* name;
182 JDK_Version obsoleted_in; // when the flag went away
183 JDK_Version accept_until; // which version to start denying the existence
184 } ObsoleteFlag;
185
186 static ObsoleteFlag obsolete_jvm_flags[] = {
187 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
188 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
189 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
190 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
191 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
192 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
193 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
194 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
195 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
196 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
197 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
198 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
199 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
200 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
201 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
202 { "DefaultInitialRAMFraction",
203 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
204 { "UseDepthFirstScavengeOrder",
205 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
206 { NULL, JDK_Version(0), JDK_Version(0) }
207 };
208
209 // Returns true if the flag is obsolete and fits into the range specified
210 // for being ignored. In the case that the flag is ignored, the 'version'
211 // value is filled in with the version number when the flag became
212 // obsolete so that that value can be displayed to the user.
213 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
214 int i = 0;
215 assert(version != NULL, "Must provide a version buffer");
216 while (obsolete_jvm_flags[i].name != NULL) {
217 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
218 // <flag>=xxx form
219 // [-|+]<flag> form
220 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
221 ((s[0] == '+' || s[0] == '-') &&
222 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
223 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
224 *version = flag_status.obsoleted_in;
225 return true;
226 }
227 }
228 i++;
229 }
230 return false;
231 }
232
233 // Constructs the system class path (aka boot class path) from the following
234 // components, in order:
235 //
236 // prefix // from -Xbootclasspath/p:...
237 // endorsed // the expansion of -Djava.endorsed.dirs=...
238 // base // from os::get_system_properties() or -Xbootclasspath=
239 // suffix // from -Xbootclasspath/a:...
240 //
241 // java.endorsed.dirs is a list of directories; any jar or zip files in the
242 // directories are added to the sysclasspath just before the base.
243 //
244 // This could be AllStatic, but it isn't needed after argument processing is
245 // complete.
246 class SysClassPath: public StackObj {
247 public:
248 SysClassPath(const char* base);
249 ~SysClassPath();
250
251 inline void set_base(const char* base);
252 inline void add_prefix(const char* prefix);
253 inline void add_suffix_to_prefix(const char* suffix);
254 inline void add_suffix(const char* suffix);
255 inline void reset_path(const char* base);
256
257 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
258 // property. Must be called after all command-line arguments have been
259 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
260 // combined_path().
261 void expand_endorsed();
262
263 inline const char* get_base() const { return _items[_scp_base]; }
264 inline const char* get_prefix() const { return _items[_scp_prefix]; }
265 inline const char* get_suffix() const { return _items[_scp_suffix]; }
266 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
267
268 // Combine all the components into a single c-heap-allocated string; caller
269 // must free the string if/when no longer needed.
270 char* combined_path();
271
272 private:
273 // Utility routines.
274 static char* add_to_path(const char* path, const char* str, bool prepend);
275 static char* add_jars_to_path(char* path, const char* directory);
276
277 inline void reset_item_at(int index);
278
279 // Array indices for the items that make up the sysclasspath. All except the
280 // base are allocated in the C heap and freed by this class.
281 enum {
282 _scp_prefix, // from -Xbootclasspath/p:...
283 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
284 _scp_base, // the default sysclasspath
285 _scp_suffix, // from -Xbootclasspath/a:...
286 _scp_nitems // the number of items, must be last.
287 };
288
289 const char* _items[_scp_nitems];
290 DEBUG_ONLY(bool _expansion_done;)
291 };
292
293 SysClassPath::SysClassPath(const char* base) {
294 memset(_items, 0, sizeof(_items));
295 _items[_scp_base] = base;
296 DEBUG_ONLY(_expansion_done = false;)
297 }
298
299 SysClassPath::~SysClassPath() {
300 // Free everything except the base.
301 for (int i = 0; i < _scp_nitems; ++i) {
302 if (i != _scp_base) reset_item_at(i);
303 }
304 DEBUG_ONLY(_expansion_done = false;)
305 }
306
307 inline void SysClassPath::set_base(const char* base) {
308 _items[_scp_base] = base;
309 }
310
311 inline void SysClassPath::add_prefix(const char* prefix) {
312 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
313 }
314
315 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
316 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
317 }
318
319 inline void SysClassPath::add_suffix(const char* suffix) {
320 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
321 }
322
323 inline void SysClassPath::reset_item_at(int index) {
324 assert(index < _scp_nitems && index != _scp_base, "just checking");
325 if (_items[index] != NULL) {
326 FREE_C_HEAP_ARRAY(char, _items[index]);
327 _items[index] = NULL;
328 }
329 }
330
331 inline void SysClassPath::reset_path(const char* base) {
332 // Clear the prefix and suffix.
333 reset_item_at(_scp_prefix);
334 reset_item_at(_scp_suffix);
335 set_base(base);
336 }
337
338 //------------------------------------------------------------------------------
339
340 void SysClassPath::expand_endorsed() {
341 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
342
343 const char* path = Arguments::get_property("java.endorsed.dirs");
344 if (path == NULL) {
345 path = Arguments::get_endorsed_dir();
346 assert(path != NULL, "no default for java.endorsed.dirs");
347 }
348
349 char* expanded_path = NULL;
350 const char separator = *os::path_separator();
351 const char* const end = path + strlen(path);
352 while (path < end) {
353 const char* tmp_end = strchr(path, separator);
354 if (tmp_end == NULL) {
355 expanded_path = add_jars_to_path(expanded_path, path);
356 path = end;
357 } else {
358 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
359 memcpy(dirpath, path, tmp_end - path);
360 dirpath[tmp_end - path] = '\0';
361 expanded_path = add_jars_to_path(expanded_path, dirpath);
362 FREE_C_HEAP_ARRAY(char, dirpath);
363 path = tmp_end + 1;
364 }
365 }
366 _items[_scp_endorsed] = expanded_path;
367 DEBUG_ONLY(_expansion_done = true;)
368 }
369
370 // Combine the bootclasspath elements, some of which may be null, into a single
371 // c-heap-allocated string.
372 char* SysClassPath::combined_path() {
373 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
374 assert(_expansion_done, "must call expand_endorsed() first.");
375
376 size_t lengths[_scp_nitems];
377 size_t total_len = 0;
378
379 const char separator = *os::path_separator();
380
381 // Get the lengths.
382 int i;
383 for (i = 0; i < _scp_nitems; ++i) {
384 if (_items[i] != NULL) {
385 lengths[i] = strlen(_items[i]);
386 // Include space for the separator char (or a NULL for the last item).
387 total_len += lengths[i] + 1;
388 }
389 }
390 assert(total_len > 0, "empty sysclasspath not allowed");
391
392 // Copy the _items to a single string.
393 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
394 char* cp_tmp = cp;
395 for (i = 0; i < _scp_nitems; ++i) {
396 if (_items[i] != NULL) {
397 memcpy(cp_tmp, _items[i], lengths[i]);
398 cp_tmp += lengths[i];
399 *cp_tmp++ = separator;
400 }
401 }
402 *--cp_tmp = '\0'; // Replace the extra separator.
403 return cp;
404 }
405
406 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
407 char*
408 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
409 char *cp;
410
411 assert(str != NULL, "just checking");
412 if (path == NULL) {
413 size_t len = strlen(str) + 1;
414 cp = NEW_C_HEAP_ARRAY(char, len);
415 memcpy(cp, str, len); // copy the trailing null
416 } else {
417 const char separator = *os::path_separator();
418 size_t old_len = strlen(path);
419 size_t str_len = strlen(str);
420 size_t len = old_len + str_len + 2;
421
422 if (prepend) {
423 cp = NEW_C_HEAP_ARRAY(char, len);
424 char* cp_tmp = cp;
425 memcpy(cp_tmp, str, str_len);
426 cp_tmp += str_len;
427 *cp_tmp = separator;
428 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
429 FREE_C_HEAP_ARRAY(char, path);
430 } else {
431 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
432 char* cp_tmp = cp + old_len;
433 *cp_tmp = separator;
434 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
435 }
436 }
437 return cp;
438 }
439
440 // Scan the directory and append any jar or zip files found to path.
441 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
442 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
443 DIR* dir = os::opendir(directory);
444 if (dir == NULL) return path;
445
446 char dir_sep[2] = { '\0', '\0' };
447 size_t directory_len = strlen(directory);
448 const char fileSep = *os::file_separator();
449 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
450
451 /* Scan the directory for jars/zips, appending them to path. */
452 struct dirent *entry;
453 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
454 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
455 const char* name = entry->d_name;
456 const char* ext = name + strlen(name) - 4;
457 bool isJarOrZip = ext > name &&
458 (os::file_name_strcmp(ext, ".jar") == 0 ||
459 os::file_name_strcmp(ext, ".zip") == 0);
460 if (isJarOrZip) {
461 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
462 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
463 path = add_to_path(path, jarpath, false);
464 FREE_C_HEAP_ARRAY(char, jarpath);
465 }
466 }
467 FREE_C_HEAP_ARRAY(char, dbuf);
468 os::closedir(dir);
469 return path;
470 }
471
472 // Parses a memory size specification string.
473 static bool atomull(const char *s, julong* result) {
474 julong n = 0;
475 int args_read = sscanf(s, os::julong_format_specifier(), &n);
476 if (args_read != 1) {
477 return false;
478 }
479 while (*s != '\0' && isdigit(*s)) {
480 s++;
481 }
482 // 4705540: illegal if more characters are found after the first non-digit
483 if (strlen(s) > 1) {
484 return false;
485 }
486 switch (*s) {
487 case 'T': case 't':
488 *result = n * G * K;
489 // Check for overflow.
490 if (*result/((julong)G * K) != n) return false;
491 return true;
492 case 'G': case 'g':
493 *result = n * G;
494 if (*result/G != n) return false;
495 return true;
496 case 'M': case 'm':
497 *result = n * M;
498 if (*result/M != n) return false;
499 return true;
500 case 'K': case 'k':
501 *result = n * K;
502 if (*result/K != n) return false;
503 return true;
504 case '\0':
505 *result = n;
506 return true;
507 default:
508 return false;
509 }
510 }
511
512 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
513 if (size < min_size) return arg_too_small;
514 // Check that size will fit in a size_t (only relevant on 32-bit)
515 if (size > max_uintx) return arg_too_big;
516 return arg_in_range;
517 }
518
519 // Describe an argument out of range error
520 void Arguments::describe_range_error(ArgsRange errcode) {
521 switch(errcode) {
522 case arg_too_big:
523 jio_fprintf(defaultStream::error_stream(),
524 "The specified size exceeds the maximum "
525 "representable size.\n");
526 break;
527 case arg_too_small:
528 case arg_unreadable:
529 case arg_in_range:
530 // do nothing for now
531 break;
532 default:
533 ShouldNotReachHere();
534 }
535 }
536
537 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
538 return CommandLineFlags::boolAtPut(name, &value, origin);
539 }
540
541 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
542 double v;
543 if (sscanf(value, "%lf", &v) != 1) {
544 return false;
545 }
546
547 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
548 return true;
549 }
550 return false;
551 }
552
553 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
554 julong v;
555 intx intx_v;
556 bool is_neg = false;
557 // Check the sign first since atomull() parses only unsigned values.
558 if (*value == '-') {
559 if (!CommandLineFlags::intxAt(name, &intx_v)) {
560 return false;
561 }
562 value++;
563 is_neg = true;
564 }
565 if (!atomull(value, &v)) {
566 return false;
567 }
568 intx_v = (intx) v;
569 if (is_neg) {
570 intx_v = -intx_v;
571 }
572 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
573 return true;
574 }
575 uintx uintx_v = (uintx) v;
576 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
577 return true;
578 }
579 uint64_t uint64_t_v = (uint64_t) v;
580 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
581 return true;
582 }
583 return false;
584 }
585
586 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
587 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
588 // Contract: CommandLineFlags always returns a pointer that needs freeing.
589 FREE_C_HEAP_ARRAY(char, value);
590 return true;
591 }
592
593 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
594 const char* old_value = "";
595 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
596 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
597 size_t new_len = strlen(new_value);
598 const char* value;
599 char* free_this_too = NULL;
600 if (old_len == 0) {
601 value = new_value;
602 } else if (new_len == 0) {
603 value = old_value;
604 } else {
605 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
606 // each new setting adds another LINE to the switch:
607 sprintf(buf, "%s\n%s", old_value, new_value);
608 value = buf;
609 free_this_too = buf;
610 }
611 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
612 // CommandLineFlags always returns a pointer that needs freeing.
613 FREE_C_HEAP_ARRAY(char, value);
614 if (free_this_too != NULL) {
615 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
616 FREE_C_HEAP_ARRAY(char, free_this_too);
617 }
618 return true;
619 }
620
621 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
622
623 // range of acceptable characters spelled out for portability reasons
624 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
625 #define BUFLEN 255
626 char name[BUFLEN+1];
627 char dummy;
628
629 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
630 return set_bool_flag(name, false, origin);
631 }
632 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
633 return set_bool_flag(name, true, origin);
634 }
635
636 char punct;
637 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
638 const char* value = strchr(arg, '=') + 1;
639 Flag* flag = Flag::find_flag(name, strlen(name));
640 if (flag != NULL && flag->is_ccstr()) {
641 if (flag->ccstr_accumulates()) {
642 return append_to_string_flag(name, value, origin);
643 } else {
644 if (value[0] == '\0') {
645 value = NULL;
646 }
647 return set_string_flag(name, value, origin);
648 }
649 }
650 }
651
652 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
653 const char* value = strchr(arg, '=') + 1;
654 // -XX:Foo:=xxx will reset the string flag to the given value.
655 if (value[0] == '\0') {
656 value = NULL;
657 }
658 return set_string_flag(name, value, origin);
659 }
660
661 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
662 #define SIGNED_NUMBER_RANGE "[-0123456789]"
663 #define NUMBER_RANGE "[0123456789]"
664 char value[BUFLEN + 1];
665 char value2[BUFLEN + 1];
666 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
667 // Looks like a floating-point number -- try again with more lenient format string
668 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
669 return set_fp_numeric_flag(name, value, origin);
670 }
671 }
672
673 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
674 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
675 return set_numeric_flag(name, value, origin);
676 }
677
678 return false;
679 }
680
681 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
682 assert(bldarray != NULL, "illegal argument");
683
684 if (arg == NULL) {
685 return;
686 }
687
688 int index = *count;
689
690 // expand the array and add arg to the last element
691 (*count)++;
692 if (*bldarray == NULL) {
693 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
694 } else {
695 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
696 }
697 (*bldarray)[index] = strdup(arg);
698 }
699
700 void Arguments::build_jvm_args(const char* arg) {
701 add_string(&_jvm_args_array, &_num_jvm_args, arg);
702 }
703
704 void Arguments::build_jvm_flags(const char* arg) {
705 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
706 }
707
708 // utility function to return a string that concatenates all
709 // strings in a given char** array
710 const char* Arguments::build_resource_string(char** args, int count) {
711 if (args == NULL || count == 0) {
712 return NULL;
713 }
714 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
715 for (int i = 1; i < count; i++) {
716 length += strlen(args[i]) + 1; // add 1 for a space
717 }
718 char* s = NEW_RESOURCE_ARRAY(char, length);
719 strcpy(s, args[0]);
720 for (int j = 1; j < count; j++) {
721 strcat(s, " ");
722 strcat(s, args[j]);
723 }
724 return (const char*) s;
725 }
726
727 void Arguments::print_on(outputStream* st) {
728 st->print_cr("VM Arguments:");
729 if (num_jvm_flags() > 0) {
730 st->print("jvm_flags: "); print_jvm_flags_on(st);
731 }
732 if (num_jvm_args() > 0) {
733 st->print("jvm_args: "); print_jvm_args_on(st);
734 }
735 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
736 st->print_cr("Launcher Type: %s", _sun_java_launcher);
737 }
738
739 void Arguments::print_jvm_flags_on(outputStream* st) {
740 if (_num_jvm_flags > 0) {
741 for (int i=0; i < _num_jvm_flags; i++) {
742 st->print("%s ", _jvm_flags_array[i]);
743 }
744 st->print_cr("");
745 }
746 }
747
748 void Arguments::print_jvm_args_on(outputStream* st) {
749 if (_num_jvm_args > 0) {
750 for (int i=0; i < _num_jvm_args; i++) {
751 st->print("%s ", _jvm_args_array[i]);
752 }
753 st->print_cr("");
754 }
755 }
756
757 bool Arguments::process_argument(const char* arg,
758 jboolean ignore_unrecognized, FlagValueOrigin origin) {
759
760 JDK_Version since = JDK_Version();
761
762 if (parse_argument(arg, origin)) {
763 // do nothing
764 } else if (is_newly_obsolete(arg, &since)) {
765 enum { bufsize = 256 };
766 char buffer[bufsize];
767 since.to_string(buffer, bufsize);
768 jio_fprintf(defaultStream::error_stream(),
769 "Warning: The flag %s has been EOL'd as of %s and will"
770 " be ignored\n", arg, buffer);
771 } else {
772 if (!ignore_unrecognized) {
773 jio_fprintf(defaultStream::error_stream(),
774 "Unrecognized VM option '%s'\n", arg);
775 // allow for commandline "commenting out" options like -XX:#+Verbose
776 if (strlen(arg) == 0 || arg[0] != '#') {
777 return false;
778 }
779 }
780 }
781 return true;
782 }
783
784 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
785 FILE* stream = fopen(file_name, "rb");
786 if (stream == NULL) {
787 if (should_exist) {
788 jio_fprintf(defaultStream::error_stream(),
789 "Could not open settings file %s\n", file_name);
790 return false;
791 } else {
792 return true;
793 }
794 }
795
796 char token[1024];
797 int pos = 0;
798
799 bool in_white_space = true;
800 bool in_comment = false;
801 bool in_quote = false;
802 char quote_c = 0;
803 bool result = true;
804
805 int c = getc(stream);
806 while(c != EOF) {
807 if (in_white_space) {
808 if (in_comment) {
809 if (c == '\n') in_comment = false;
810 } else {
811 if (c == '#') in_comment = true;
812 else if (!isspace(c)) {
813 in_white_space = false;
814 token[pos++] = c;
815 }
816 }
817 } else {
818 if (c == '\n' || (!in_quote && isspace(c))) {
819 // token ends at newline, or at unquoted whitespace
820 // this allows a way to include spaces in string-valued options
821 token[pos] = '\0';
822 logOption(token);
823 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
824 build_jvm_flags(token);
825 pos = 0;
826 in_white_space = true;
827 in_quote = false;
828 } else if (!in_quote && (c == '\'' || c == '"')) {
829 in_quote = true;
830 quote_c = c;
831 } else if (in_quote && (c == quote_c)) {
832 in_quote = false;
833 } else {
834 token[pos++] = c;
835 }
836 }
837 c = getc(stream);
838 }
839 if (pos > 0) {
840 token[pos] = '\0';
841 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
842 build_jvm_flags(token);
843 }
844 fclose(stream);
845 return result;
846 }
847
848 //=============================================================================================================
849 // Parsing of properties (-D)
850
851 const char* Arguments::get_property(const char* key) {
852 return PropertyList_get_value(system_properties(), key);
853 }
854
855 bool Arguments::add_property(const char* prop) {
856 const char* eq = strchr(prop, '=');
857 char* key;
858 // ns must be static--its address may be stored in a SystemProperty object.
859 const static char ns[1] = {0};
860 char* value = (char *)ns;
861
862 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
863 key = AllocateHeap(key_len + 1, "add_property");
864 strncpy(key, prop, key_len);
865 key[key_len] = '\0';
866
867 if (eq != NULL) {
868 size_t value_len = strlen(prop) - key_len - 1;
869 value = AllocateHeap(value_len + 1, "add_property");
870 strncpy(value, &prop[key_len + 1], value_len + 1);
871 }
872
873 if (strcmp(key, "java.compiler") == 0) {
874 process_java_compiler_argument(value);
875 FreeHeap(key);
876 if (eq != NULL) {
877 FreeHeap(value);
878 }
879 return true;
880 } else if (strcmp(key, "sun.java.command") == 0) {
881 _java_command = value;
882
883 // don't add this property to the properties exposed to the java application
884 FreeHeap(key);
885 return true;
886 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
887 // launcher.pid property is private and is processed
888 // in process_sun_java_launcher_properties();
889 // the sun.java.launcher property is passed on to the java application
890 FreeHeap(key);
891 if (eq != NULL) {
892 FreeHeap(value);
893 }
894 return true;
895 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
896 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
897 // its value without going through the property list or making a Java call.
898 _java_vendor_url_bug = value;
899 } else if (strcmp(key, "sun.boot.library.path") == 0) {
900 PropertyList_unique_add(&_system_properties, key, value, true);
901 return true;
902 }
903 // Create new property and add at the end of the list
904 PropertyList_unique_add(&_system_properties, key, value);
905 return true;
906 }
907
908 //===========================================================================================================
909 // Setting int/mixed/comp mode flags
910
911 void Arguments::set_mode_flags(Mode mode) {
912 // Set up default values for all flags.
913 // If you add a flag to any of the branches below,
914 // add a default value for it here.
915 set_java_compiler(false);
916 _mode = mode;
917
918 // Ensure Agent_OnLoad has the correct initial values.
919 // This may not be the final mode; mode may change later in onload phase.
920 PropertyList_unique_add(&_system_properties, "java.vm.info",
921 (char*)Abstract_VM_Version::vm_info_string(), false);
922
923 UseInterpreter = true;
924 UseCompiler = true;
925 UseLoopCounter = true;
926
927 // Default values may be platform/compiler dependent -
928 // use the saved values
929 ClipInlining = Arguments::_ClipInlining;
930 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
931 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
932 BackgroundCompilation = Arguments::_BackgroundCompilation;
933
934 // Change from defaults based on mode
935 switch (mode) {
936 default:
937 ShouldNotReachHere();
938 break;
939 case _int:
940 UseCompiler = false;
941 UseLoopCounter = false;
942 AlwaysCompileLoopMethods = false;
943 UseOnStackReplacement = false;
944 break;
945 case _mixed:
946 // same as default
947 break;
948 case _comp:
949 UseInterpreter = false;
950 BackgroundCompilation = false;
951 ClipInlining = false;
952 break;
953 }
954 }
955
956 // Conflict: required to use shared spaces (-Xshare:on), but
957 // incompatible command line options were chosen.
958
959 static void no_shared_spaces() {
960 if (RequireSharedSpaces) {
961 jio_fprintf(defaultStream::error_stream(),
962 "Class data sharing is inconsistent with other specified options.\n");
963 vm_exit_during_initialization("Unable to use shared archive.", NULL);
964 } else {
965 FLAG_SET_DEFAULT(UseSharedSpaces, false);
966 }
967 }
968
969 void Arguments::set_tiered_flags() {
970 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
971 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
972 }
973
974 if (CompilationPolicyChoice < 2) {
975 vm_exit_during_initialization(
976 "Incompatible compilation policy selected", NULL);
977 }
978
979 #ifdef _LP64
980 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
981 UseCompressedOops = false;
982 }
983 if (UseCompressedOops) {
984 vm_exit_during_initialization(
985 "Tiered compilation is not supported with compressed oops yet", NULL);
986 }
987 #endif
988 // Increase the code cache size - tiered compiles a lot more.
989 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
990 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
991 }
992 }
993
994 #ifndef KERNEL
995 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
996 // if it's not explictly set or unset. If the user has chosen
997 // UseParNewGC and not explicitly set ParallelGCThreads we
998 // set it, unless this is a single cpu machine.
999 void Arguments::set_parnew_gc_flags() {
1000 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1001 "control point invariant");
1002 assert(UseParNewGC, "Error");
1003
1004 // Turn off AdaptiveSizePolicy by default for parnew until it is
1005 // complete.
1006 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1007 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1008 }
1009
1010 if (ParallelGCThreads == 0) {
1011 FLAG_SET_DEFAULT(ParallelGCThreads,
1012 Abstract_VM_Version::parallel_worker_threads());
1013 if (ParallelGCThreads == 1) {
1014 FLAG_SET_DEFAULT(UseParNewGC, false);
1015 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1016 }
1017 }
1018 if (UseParNewGC) {
1019 // CDS doesn't work with ParNew yet
1020 no_shared_spaces();
1021
1022 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1023 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1024 // we set them to 1024 and 1024.
1025 // See CR 6362902.
1026 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1027 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1028 }
1029 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1030 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1031 }
1032
1033 // AlwaysTenure flag should make ParNew promote all at first collection.
1034 // See CR 6362902.
1035 if (AlwaysTenure) {
1036 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1037 }
1038 // When using compressed oops, we use local overflow stacks,
1039 // rather than using a global overflow list chained through
1040 // the klass word of the object's pre-image.
1041 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1042 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1043 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1044 }
1045 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1046 }
1047 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1048 }
1049 }
1050
1051 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1052 // sparc/solaris for certain applications, but would gain from
1053 // further optimization and tuning efforts, and would almost
1054 // certainly gain from analysis of platform and environment.
1055 void Arguments::set_cms_and_parnew_gc_flags() {
1056 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1057 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1058
1059 // If we are using CMS, we prefer to UseParNewGC,
1060 // unless explicitly forbidden.
1061 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1062 FLAG_SET_ERGO(bool, UseParNewGC, true);
1063 }
1064
1065 // Turn off AdaptiveSizePolicy by default for cms until it is
1066 // complete.
1067 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1068 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1069 }
1070
1071 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1072 // as needed.
1073 if (UseParNewGC) {
1074 set_parnew_gc_flags();
1075 }
1076
1077 // Now make adjustments for CMS
1078 size_t young_gen_per_worker;
1079 intx new_ratio;
1080 size_t min_new_default;
1081 intx tenuring_default;
1082 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1083 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1084 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1085 }
1086 young_gen_per_worker = 4*M;
1087 new_ratio = (intx)15;
1088 min_new_default = 4*M;
1089 tenuring_default = (intx)0;
1090 } else { // new defaults: "new" as of 6.0
1091 young_gen_per_worker = CMSYoungGenPerWorker;
1092 new_ratio = (intx)7;
1093 min_new_default = 16*M;
1094 tenuring_default = (intx)4;
1095 }
1096
1097 // Preferred young gen size for "short" pauses
1098 const uintx parallel_gc_threads =
1099 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1100 const size_t preferred_max_new_size_unaligned =
1101 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1102 const size_t preferred_max_new_size =
1103 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1104
1105 // Unless explicitly requested otherwise, size young gen
1106 // for "short" pauses ~ 4M*ParallelGCThreads
1107
1108 // If either MaxNewSize or NewRatio is set on the command line,
1109 // assume the user is trying to set the size of the young gen.
1110
1111 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1112
1113 // Set MaxNewSize to our calculated preferred_max_new_size unless
1114 // NewSize was set on the command line and it is larger than
1115 // preferred_max_new_size.
1116 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1117 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1118 } else {
1119 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1120 }
1121 if (PrintGCDetails && Verbose) {
1122 // Too early to use gclog_or_tty
1123 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1124 }
1125
1126 // Unless explicitly requested otherwise, prefer a large
1127 // Old to Young gen size so as to shift the collection load
1128 // to the old generation concurrent collector
1129
1130 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1131 // then NewSize and OldSize may be calculated. That would
1132 // generally lead to some differences with ParNewGC for which
1133 // there was no obvious reason. Also limit to the case where
1134 // MaxNewSize has not been set.
1135
1136 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1137
1138 // Code along this path potentially sets NewSize and OldSize
1139
1140 // Calculate the desired minimum size of the young gen but if
1141 // NewSize has been set on the command line, use it here since
1142 // it should be the final value.
1143 size_t min_new;
1144 if (FLAG_IS_DEFAULT(NewSize)) {
1145 min_new = align_size_up(ScaleForWordSize(min_new_default),
1146 os::vm_page_size());
1147 } else {
1148 min_new = NewSize;
1149 }
1150 size_t prev_initial_size = InitialHeapSize;
1151 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1152 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1153 // Currently minimum size and the initial heap sizes are the same.
1154 set_min_heap_size(InitialHeapSize);
1155 if (PrintGCDetails && Verbose) {
1156 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1157 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1158 InitialHeapSize/M, prev_initial_size/M);
1159 }
1160 }
1161
1162 // MaxHeapSize is aligned down in collectorPolicy
1163 size_t max_heap =
1164 align_size_down(MaxHeapSize,
1165 CardTableRS::ct_max_alignment_constraint());
1166
1167 if (PrintGCDetails && Verbose) {
1168 // Too early to use gclog_or_tty
1169 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1170 " initial_heap_size: " SIZE_FORMAT
1171 " max_heap: " SIZE_FORMAT,
1172 min_heap_size(), InitialHeapSize, max_heap);
1173 }
1174 if (max_heap > min_new) {
1175 // Unless explicitly requested otherwise, make young gen
1176 // at least min_new, and at most preferred_max_new_size.
1177 if (FLAG_IS_DEFAULT(NewSize)) {
1178 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1179 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1180 if (PrintGCDetails && Verbose) {
1181 // Too early to use gclog_or_tty
1182 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1183 }
1184 }
1185 // Unless explicitly requested otherwise, size old gen
1186 // so that it's at least 3X of NewSize to begin with;
1187 // later NewRatio will decide how it grows; see above.
1188 if (FLAG_IS_DEFAULT(OldSize)) {
1189 if (max_heap > NewSize) {
1190 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1191 if (PrintGCDetails && Verbose) {
1192 // Too early to use gclog_or_tty
1193 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1194 }
1195 }
1196 }
1197 }
1198 }
1199 // Unless explicitly requested otherwise, definitely
1200 // promote all objects surviving "tenuring_default" scavenges.
1201 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1202 FLAG_IS_DEFAULT(SurvivorRatio)) {
1203 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1204 }
1205 // If we decided above (or user explicitly requested)
1206 // `promote all' (via MaxTenuringThreshold := 0),
1207 // prefer minuscule survivor spaces so as not to waste
1208 // space for (non-existent) survivors
1209 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1210 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1211 }
1212 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1213 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1214 // This is done in order to make ParNew+CMS configuration to work
1215 // with YoungPLABSize and OldPLABSize options.
1216 // See CR 6362902.
1217 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1218 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1219 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1220 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1221 // the value (either from the command line or ergonomics) of
1222 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1223 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1224 } else {
1225 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1226 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1227 // we'll let it to take precedence.
1228 jio_fprintf(defaultStream::error_stream(),
1229 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1230 " options are specified for the CMS collector."
1231 " CMSParPromoteBlocksToClaim will take precedence.\n");
1232 }
1233 }
1234 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1235 // OldPLAB sizing manually turned off: Use a larger default setting,
1236 // unless it was manually specified. This is because a too-low value
1237 // will slow down scavenges.
1238 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1239 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1240 }
1241 }
1242 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1243 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1244 // If either of the static initialization defaults have changed, note this
1245 // modification.
1246 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1247 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1248 }
1249 if (PrintGCDetails && Verbose) {
1250 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1251 MarkStackSize / K, MarkStackSizeMax / K);
1252 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1253 }
1254 }
1255 #endif // KERNEL
1256
1257 void set_object_alignment() {
1258 // Object alignment.
1259 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1260 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1261 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1262 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1263 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1264 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1265
1266 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1267 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1268
1269 // Oop encoding heap max
1270 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1271
1272 #ifndef KERNEL
1273 // Set CMS global values
1274 CompactibleFreeListSpace::set_cms_values();
1275 #endif // KERNEL
1276 }
1277
1278 bool verify_object_alignment() {
1279 // Object alignment.
1280 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1281 jio_fprintf(defaultStream::error_stream(),
1282 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1283 (int)ObjectAlignmentInBytes);
1284 return false;
1285 }
1286 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1287 jio_fprintf(defaultStream::error_stream(),
1288 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1289 (int)ObjectAlignmentInBytes, BytesPerLong);
1290 return false;
1291 }
1292 // It does not make sense to have big object alignment
1293 // since a space lost due to alignment will be greater
1294 // then a saved space from compressed oops.
1295 if ((int)ObjectAlignmentInBytes > 256) {
1296 jio_fprintf(defaultStream::error_stream(),
1297 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1298 (int)ObjectAlignmentInBytes);
1299 return false;
1300 }
1301 // In case page size is very small.
1302 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1303 jio_fprintf(defaultStream::error_stream(),
1304 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1305 (int)ObjectAlignmentInBytes, os::vm_page_size());
1306 return false;
1307 }
1308 return true;
1309 }
1310
1311 inline uintx max_heap_for_compressed_oops() {
1312 // Heap should be above HeapBaseMinAddress to get zero based compressed oops.
1313 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size() - HeapBaseMinAddress);
1314 NOT_LP64(ShouldNotReachHere(); return 0);
1315 }
1316
1317 bool Arguments::should_auto_select_low_pause_collector() {
1318 if (UseAutoGCSelectPolicy &&
1319 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1320 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1321 if (PrintGCDetails) {
1322 // Cannot use gclog_or_tty yet.
1323 tty->print_cr("Automatic selection of the low pause collector"
1324 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1325 }
1326 return true;
1327 }
1328 return false;
1329 }
1330
1331 void Arguments::set_ergonomics_flags() {
1332 // Parallel GC is not compatible with sharing. If one specifies
1333 // that they want sharing explicitly, do not set ergonomics flags.
1334 if (DumpSharedSpaces || ForceSharedSpaces) {
1335 return;
1336 }
1337
1338 if (os::is_server_class_machine() && !force_client_mode ) {
1339 // If no other collector is requested explicitly,
1340 // let the VM select the collector based on
1341 // machine class and automatic selection policy.
1342 if (!UseSerialGC &&
1343 !UseConcMarkSweepGC &&
1344 !UseG1GC &&
1345 !UseParNewGC &&
1346 !DumpSharedSpaces &&
1347 FLAG_IS_DEFAULT(UseParallelGC)) {
1348 if (should_auto_select_low_pause_collector()) {
1349 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1350 } else {
1351 FLAG_SET_ERGO(bool, UseParallelGC, true);
1352 }
1353 no_shared_spaces();
1354 }
1355 }
1356
1357 #ifndef ZERO
1358 #ifdef _LP64
1359 // Check that UseCompressedOops can be set with the max heap size allocated
1360 // by ergonomics.
1361 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1362 #if !defined(COMPILER1) || defined(TIERED)
1363 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1364 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1365 }
1366 #endif
1367 #ifdef _WIN64
1368 if (UseLargePages && UseCompressedOops) {
1369 // Cannot allocate guard pages for implicit checks in indexed addressing
1370 // mode, when large pages are specified on windows.
1371 // This flag could be switched ON if narrow oop base address is set to 0,
1372 // see code in Universe::initialize_heap().
1373 Universe::set_narrow_oop_use_implicit_null_checks(false);
1374 }
1375 #endif // _WIN64
1376 } else {
1377 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1378 warning("Max heap size too large for Compressed Oops");
1379 FLAG_SET_DEFAULT(UseCompressedOops, false);
1380 }
1381 }
1382 // Also checks that certain machines are slower with compressed oops
1383 // in vm_version initialization code.
1384 #endif // _LP64
1385 #endif // !ZERO
1386 }
1387
1388 void Arguments::set_parallel_gc_flags() {
1389 assert(UseParallelGC || UseParallelOldGC, "Error");
1390 // If parallel old was requested, automatically enable parallel scavenge.
1391 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1392 FLAG_SET_DEFAULT(UseParallelGC, true);
1393 }
1394
1395 // If no heap maximum was requested explicitly, use some reasonable fraction
1396 // of the physical memory, up to a maximum of 1GB.
1397 if (UseParallelGC) {
1398 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1399 Abstract_VM_Version::parallel_worker_threads());
1400
1401 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1402 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1403 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1404 // See CR 6362902 for details.
1405 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1406 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1407 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1408 }
1409 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1410 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1411 }
1412 }
1413
1414 if (UseParallelOldGC) {
1415 // Par compact uses lower default values since they are treated as
1416 // minimums. These are different defaults because of the different
1417 // interpretation and are not ergonomically set.
1418 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1419 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1420 }
1421 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1422 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1423 }
1424 }
1425 }
1426 }
1427
1428 void Arguments::set_g1_gc_flags() {
1429 assert(UseG1GC, "Error");
1430 #ifdef COMPILER1
1431 FastTLABRefill = false;
1432 #endif
1433 FLAG_SET_DEFAULT(ParallelGCThreads,
1434 Abstract_VM_Version::parallel_worker_threads());
1435 if (ParallelGCThreads == 0) {
1436 FLAG_SET_DEFAULT(ParallelGCThreads,
1437 Abstract_VM_Version::parallel_worker_threads());
1438 }
1439 no_shared_spaces();
1440
1441 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1442 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1443 }
1444 if (PrintGCDetails && Verbose) {
1445 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1446 MarkStackSize / K, MarkStackSizeMax / K);
1447 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1448 }
1449
1450 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1451 // In G1, we want the default GC overhead goal to be higher than
1452 // say in PS. So we set it here to 10%. Otherwise the heap might
1453 // be expanded more aggressively than we would like it to. In
1454 // fact, even 10% seems to not be high enough in some cases
1455 // (especially small GC stress tests that the main thing they do
1456 // is allocation). We might consider increase it further.
1457 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1458 }
1459 }
1460
1461 void Arguments::set_heap_size() {
1462 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1463 // Deprecated flag
1464 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1465 }
1466
1467 const julong phys_mem =
1468 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1469 : (julong)MaxRAM;
1470
1471 // If the maximum heap size has not been set with -Xmx,
1472 // then set it as fraction of the size of physical memory,
1473 // respecting the maximum and minimum sizes of the heap.
1474 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1475 julong reasonable_max = phys_mem / MaxRAMFraction;
1476
1477 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1478 // Small physical memory, so use a minimum fraction of it for the heap
1479 reasonable_max = phys_mem / MinRAMFraction;
1480 } else {
1481 // Not-small physical memory, so require a heap at least
1482 // as large as MaxHeapSize
1483 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1484 }
1485 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1486 // Limit the heap size to ErgoHeapSizeLimit
1487 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1488 }
1489 if (UseCompressedOops) {
1490 // Limit the heap size to the maximum possible when using compressed oops
1491 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1492 }
1493 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1494
1495 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1496 // An initial heap size was specified on the command line,
1497 // so be sure that the maximum size is consistent. Done
1498 // after call to allocatable_physical_memory because that
1499 // method might reduce the allocation size.
1500 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1501 }
1502
1503 if (PrintGCDetails && Verbose) {
1504 // Cannot use gclog_or_tty yet.
1505 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1506 }
1507 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1508 }
1509
1510 // If the initial_heap_size has not been set with InitialHeapSize
1511 // or -Xms, then set it as fraction of the size of physical memory,
1512 // respecting the maximum and minimum sizes of the heap.
1513 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1514 julong reasonable_minimum = (julong)(OldSize + NewSize);
1515
1516 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1517
1518 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1519
1520 julong reasonable_initial = phys_mem / InitialRAMFraction;
1521
1522 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1523 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1524
1525 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1526
1527 if (PrintGCDetails && Verbose) {
1528 // Cannot use gclog_or_tty yet.
1529 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1530 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1531 }
1532 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1533 set_min_heap_size((uintx)reasonable_minimum);
1534 }
1535 }
1536
1537 // This must be called after ergonomics because we want bytecode rewriting
1538 // if the server compiler is used, or if UseSharedSpaces is disabled.
1539 void Arguments::set_bytecode_flags() {
1540 // Better not attempt to store into a read-only space.
1541 if (UseSharedSpaces) {
1542 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1543 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1544 }
1545
1546 if (!RewriteBytecodes) {
1547 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1548 }
1549 }
1550
1551 // Aggressive optimization flags -XX:+AggressiveOpts
1552 void Arguments::set_aggressive_opts_flags() {
1553 #ifdef COMPILER2
1554 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1555 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1556 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1557 }
1558 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1559 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1560 }
1561
1562 // Feed the cache size setting into the JDK
1563 char buffer[1024];
1564 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1565 add_property(buffer);
1566 }
1567 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1568 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1569 }
1570 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1571 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1572 }
1573 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1574 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1575 }
1576 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1577 FLAG_SET_DEFAULT(OptimizeFill, true);
1578 }
1579 #endif
1580
1581 if (AggressiveOpts) {
1582 // Sample flag setting code
1583 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1584 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1585 // }
1586 }
1587 }
1588
1589 //===========================================================================================================
1590 // Parsing of java.compiler property
1591
1592 void Arguments::process_java_compiler_argument(char* arg) {
1593 // For backwards compatibility, Djava.compiler=NONE or ""
1594 // causes us to switch to -Xint mode UNLESS -Xdebug
1595 // is also specified.
1596 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1597 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1598 }
1599 }
1600
1601 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1602 _sun_java_launcher = strdup(launcher);
1603 }
1604
1605 bool Arguments::created_by_java_launcher() {
1606 assert(_sun_java_launcher != NULL, "property must have value");
1607 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1608 }
1609
1610 //===========================================================================================================
1611 // Parsing of main arguments
1612
1613 bool Arguments::verify_interval(uintx val, uintx min,
1614 uintx max, const char* name) {
1615 // Returns true iff value is in the inclusive interval [min..max]
1616 // false, otherwise.
1617 if (val >= min && val <= max) {
1618 return true;
1619 }
1620 jio_fprintf(defaultStream::error_stream(),
1621 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1622 " and " UINTX_FORMAT "\n",
1623 name, val, min, max);
1624 return false;
1625 }
1626
1627 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1628 // Returns true if given value is greater than specified min threshold
1629 // false, otherwise.
1630 if (val >= min ) {
1631 return true;
1632 }
1633 jio_fprintf(defaultStream::error_stream(),
1634 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1635 name, val, min);
1636 return false;
1637 }
1638
1639 bool Arguments::verify_percentage(uintx value, const char* name) {
1640 if (value <= 100) {
1641 return true;
1642 }
1643 jio_fprintf(defaultStream::error_stream(),
1644 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1645 name, value);
1646 return false;
1647 }
1648
1649 static void force_serial_gc() {
1650 FLAG_SET_DEFAULT(UseSerialGC, true);
1651 FLAG_SET_DEFAULT(UseParNewGC, false);
1652 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1653 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1654 FLAG_SET_DEFAULT(UseParallelGC, false);
1655 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1656 FLAG_SET_DEFAULT(UseG1GC, false);
1657 }
1658
1659 static bool verify_serial_gc_flags() {
1660 return (UseSerialGC &&
1661 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1662 UseParallelGC || UseParallelOldGC));
1663 }
1664
1665 // Check consistency of GC selection
1666 bool Arguments::check_gc_consistency() {
1667 bool status = true;
1668 // Ensure that the user has not selected conflicting sets
1669 // of collectors. [Note: this check is merely a user convenience;
1670 // collectors over-ride each other so that only a non-conflicting
1671 // set is selected; however what the user gets is not what they
1672 // may have expected from the combination they asked for. It's
1673 // better to reduce user confusion by not allowing them to
1674 // select conflicting combinations.
1675 uint i = 0;
1676 if (UseSerialGC) i++;
1677 if (UseConcMarkSweepGC || UseParNewGC) i++;
1678 if (UseParallelGC || UseParallelOldGC) i++;
1679 if (UseG1GC) i++;
1680 if (i > 1) {
1681 jio_fprintf(defaultStream::error_stream(),
1682 "Conflicting collector combinations in option list; "
1683 "please refer to the release notes for the combinations "
1684 "allowed\n");
1685 status = false;
1686 }
1687
1688 return status;
1689 }
1690
1691 // Check stack pages settings
1692 bool Arguments::check_stack_pages()
1693 {
1694 bool status = true;
1695 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1696 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1697 // greater stack shadow pages can't generate instruction to bang stack
1698 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1699 return status;
1700 }
1701
1702 // Check the consistency of vm_init_args
1703 bool Arguments::check_vm_args_consistency() {
1704 // Method for adding checks for flag consistency.
1705 // The intent is to warn the user of all possible conflicts,
1706 // before returning an error.
1707 // Note: Needs platform-dependent factoring.
1708 bool status = true;
1709
1710 #if ( (defined(COMPILER2) && defined(SPARC)))
1711 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1712 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1713 // x86. Normally, VM_Version_init must be called from init_globals in
1714 // init.cpp, which is called by the initial java thread *after* arguments
1715 // have been parsed. VM_Version_init gets called twice on sparc.
1716 extern void VM_Version_init();
1717 VM_Version_init();
1718 if (!VM_Version::has_v9()) {
1719 jio_fprintf(defaultStream::error_stream(),
1720 "V8 Machine detected, Server requires V9\n");
1721 status = false;
1722 }
1723 #endif /* COMPILER2 && SPARC */
1724
1725 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1726 // builds so the cost of stack banging can be measured.
1727 #if (defined(PRODUCT) && defined(SOLARIS))
1728 if (!UseBoundThreads && !UseStackBanging) {
1729 jio_fprintf(defaultStream::error_stream(),
1730 "-UseStackBanging conflicts with -UseBoundThreads\n");
1731
1732 status = false;
1733 }
1734 #endif
1735
1736 if (TLABRefillWasteFraction == 0) {
1737 jio_fprintf(defaultStream::error_stream(),
1738 "TLABRefillWasteFraction should be a denominator, "
1739 "not " SIZE_FORMAT "\n",
1740 TLABRefillWasteFraction);
1741 status = false;
1742 }
1743
1744 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1745 "MaxLiveObjectEvacuationRatio");
1746 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1747 "AdaptiveSizePolicyWeight");
1748 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1749 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1750 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1751 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1752
1753 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1754 jio_fprintf(defaultStream::error_stream(),
1755 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1756 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1757 MinHeapFreeRatio, MaxHeapFreeRatio);
1758 status = false;
1759 }
1760 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1761 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1762
1763 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1764 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1765 }
1766
1767 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1768 // Settings to encourage splitting.
1769 if (!FLAG_IS_CMDLINE(NewRatio)) {
1770 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1771 }
1772 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1773 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1774 }
1775 }
1776
1777 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1778 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1779 if (GCTimeLimit == 100) {
1780 // Turn off gc-overhead-limit-exceeded checks
1781 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1782 }
1783
1784 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1785
1786 // Check whether user-specified sharing option conflicts with GC or page size.
1787 // Both sharing and large pages are enabled by default on some platforms;
1788 // large pages override sharing only if explicitly set on the command line.
1789 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1790 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1791 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1792 if (cannot_share) {
1793 // Either force sharing on by forcing the other options off, or
1794 // force sharing off.
1795 if (DumpSharedSpaces || ForceSharedSpaces) {
1796 jio_fprintf(defaultStream::error_stream(),
1797 "Using Serial GC and default page size because of %s\n",
1798 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1799 force_serial_gc();
1800 FLAG_SET_DEFAULT(UseLargePages, false);
1801 } else {
1802 if (UseSharedSpaces && Verbose) {
1803 jio_fprintf(defaultStream::error_stream(),
1804 "Turning off use of shared archive because of "
1805 "choice of garbage collector or large pages\n");
1806 }
1807 no_shared_spaces();
1808 }
1809 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1810 FLAG_SET_DEFAULT(UseLargePages, false);
1811 }
1812
1813 status = status && check_gc_consistency();
1814 status = status && check_stack_pages();
1815
1816 if (_has_alloc_profile) {
1817 if (UseParallelGC || UseParallelOldGC) {
1818 jio_fprintf(defaultStream::error_stream(),
1819 "error: invalid argument combination.\n"
1820 "Allocation profiling (-Xaprof) cannot be used together with "
1821 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1822 status = false;
1823 }
1824 if (UseConcMarkSweepGC) {
1825 jio_fprintf(defaultStream::error_stream(),
1826 "error: invalid argument combination.\n"
1827 "Allocation profiling (-Xaprof) cannot be used together with "
1828 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1829 status = false;
1830 }
1831 }
1832
1833 if (CMSIncrementalMode) {
1834 if (!UseConcMarkSweepGC) {
1835 jio_fprintf(defaultStream::error_stream(),
1836 "error: invalid argument combination.\n"
1837 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1838 "selected in order\nto use CMSIncrementalMode.\n");
1839 status = false;
1840 } else {
1841 status = status && verify_percentage(CMSIncrementalDutyCycle,
1842 "CMSIncrementalDutyCycle");
1843 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1844 "CMSIncrementalDutyCycleMin");
1845 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1846 "CMSIncrementalSafetyFactor");
1847 status = status && verify_percentage(CMSIncrementalOffset,
1848 "CMSIncrementalOffset");
1849 status = status && verify_percentage(CMSExpAvgFactor,
1850 "CMSExpAvgFactor");
1851 // If it was not set on the command line, set
1852 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1853 if (CMSInitiatingOccupancyFraction < 0) {
1854 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1855 }
1856 }
1857 }
1858
1859 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1860 // insists that we hold the requisite locks so that the iteration is
1861 // MT-safe. For the verification at start-up and shut-down, we don't
1862 // yet have a good way of acquiring and releasing these locks,
1863 // which are not visible at the CollectedHeap level. We want to
1864 // be able to acquire these locks and then do the iteration rather
1865 // than just disable the lock verification. This will be fixed under
1866 // bug 4788986.
1867 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1868 if (VerifyGCStartAt == 0) {
1869 warning("Heap verification at start-up disabled "
1870 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1871 VerifyGCStartAt = 1; // Disable verification at start-up
1872 }
1873 if (VerifyBeforeExit) {
1874 warning("Heap verification at shutdown disabled "
1875 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1876 VerifyBeforeExit = false; // Disable verification at shutdown
1877 }
1878 }
1879
1880 // Note: only executed in non-PRODUCT mode
1881 if (!UseAsyncConcMarkSweepGC &&
1882 (ExplicitGCInvokesConcurrent ||
1883 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1884 jio_fprintf(defaultStream::error_stream(),
1885 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1886 " with -UseAsyncConcMarkSweepGC");
1887 status = false;
1888 }
1889
1890 if (UseG1GC) {
1891 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1892 "InitiatingHeapOccupancyPercent");
1893 }
1894
1895 status = status && verify_interval(RefDiscoveryPolicy,
1896 ReferenceProcessor::DiscoveryPolicyMin,
1897 ReferenceProcessor::DiscoveryPolicyMax,
1898 "RefDiscoveryPolicy");
1899
1900 // Limit the lower bound of this flag to 1 as it is used in a division
1901 // expression.
1902 status = status && verify_interval(TLABWasteTargetPercent,
1903 1, 100, "TLABWasteTargetPercent");
1904
1905 status = status && verify_object_alignment();
1906
1907 return status;
1908 }
1909
1910 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1911 const char* option_type) {
1912 if (ignore) return false;
1913
1914 const char* spacer = " ";
1915 if (option_type == NULL) {
1916 option_type = ++spacer; // Set both to the empty string.
1917 }
1918
1919 if (os::obsolete_option(option)) {
1920 jio_fprintf(defaultStream::error_stream(),
1921 "Obsolete %s%soption: %s\n", option_type, spacer,
1922 option->optionString);
1923 return false;
1924 } else {
1925 jio_fprintf(defaultStream::error_stream(),
1926 "Unrecognized %s%soption: %s\n", option_type, spacer,
1927 option->optionString);
1928 return true;
1929 }
1930 }
1931
1932 static const char* user_assertion_options[] = {
1933 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1934 };
1935
1936 static const char* system_assertion_options[] = {
1937 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1938 };
1939
1940 // Return true if any of the strings in null-terminated array 'names' matches.
1941 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1942 // the option must match exactly.
1943 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1944 bool tail_allowed) {
1945 for (/* empty */; *names != NULL; ++names) {
1946 if (match_option(option, *names, tail)) {
1947 if (**tail == '\0' || tail_allowed && **tail == ':') {
1948 return true;
1949 }
1950 }
1951 }
1952 return false;
1953 }
1954
1955 bool Arguments::parse_uintx(const char* value,
1956 uintx* uintx_arg,
1957 uintx min_size) {
1958
1959 // Check the sign first since atomull() parses only unsigned values.
1960 bool value_is_positive = !(*value == '-');
1961
1962 if (value_is_positive) {
1963 julong n;
1964 bool good_return = atomull(value, &n);
1965 if (good_return) {
1966 bool above_minimum = n >= min_size;
1967 bool value_is_too_large = n > max_uintx;
1968
1969 if (above_minimum && !value_is_too_large) {
1970 *uintx_arg = n;
1971 return true;
1972 }
1973 }
1974 }
1975 return false;
1976 }
1977
1978 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1979 julong* long_arg,
1980 julong min_size) {
1981 if (!atomull(s, long_arg)) return arg_unreadable;
1982 return check_memory_size(*long_arg, min_size);
1983 }
1984
1985 // Parse JavaVMInitArgs structure
1986
1987 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1988 // For components of the system classpath.
1989 SysClassPath scp(Arguments::get_sysclasspath());
1990 bool scp_assembly_required = false;
1991
1992 // Save default settings for some mode flags
1993 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1994 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1995 Arguments::_ClipInlining = ClipInlining;
1996 Arguments::_BackgroundCompilation = BackgroundCompilation;
1997
1998 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1999 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2000 if (result != JNI_OK) {
2001 return result;
2002 }
2003
2004 // Parse JavaVMInitArgs structure passed in
2005 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2006 if (result != JNI_OK) {
2007 return result;
2008 }
2009
2010 if (AggressiveOpts) {
2011 // Insert alt-rt.jar between user-specified bootclasspath
2012 // prefix and the default bootclasspath. os::set_boot_path()
2013 // uses meta_index_dir as the default bootclasspath directory.
2014 const char* altclasses_jar = "alt-rt.jar";
2015 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2016 strlen(altclasses_jar);
2017 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2018 strcpy(altclasses_path, get_meta_index_dir());
2019 strcat(altclasses_path, altclasses_jar);
2020 scp.add_suffix_to_prefix(altclasses_path);
2021 scp_assembly_required = true;
2022 FREE_C_HEAP_ARRAY(char, altclasses_path);
2023 }
2024
2025 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2026 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2027 if (result != JNI_OK) {
2028 return result;
2029 }
2030
2031 // Do final processing now that all arguments have been parsed
2032 result = finalize_vm_init_args(&scp, scp_assembly_required);
2033 if (result != JNI_OK) {
2034 return result;
2035 }
2036
2037 return JNI_OK;
2038 }
2039
2040 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2041 SysClassPath* scp_p,
2042 bool* scp_assembly_required_p,
2043 FlagValueOrigin origin) {
2044 // Remaining part of option string
2045 const char* tail;
2046
2047 // iterate over arguments
2048 for (int index = 0; index < args->nOptions; index++) {
2049 bool is_absolute_path = false; // for -agentpath vs -agentlib
2050
2051 const JavaVMOption* option = args->options + index;
2052
2053 if (!match_option(option, "-Djava.class.path", &tail) &&
2054 !match_option(option, "-Dsun.java.command", &tail) &&
2055 !match_option(option, "-Dsun.java.launcher", &tail)) {
2056
2057 // add all jvm options to the jvm_args string. This string
2058 // is used later to set the java.vm.args PerfData string constant.
2059 // the -Djava.class.path and the -Dsun.java.command options are
2060 // omitted from jvm_args string as each have their own PerfData
2061 // string constant object.
2062 build_jvm_args(option->optionString);
2063 }
2064
2065 // -verbose:[class/gc/jni]
2066 if (match_option(option, "-verbose", &tail)) {
2067 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2068 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2069 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2070 } else if (!strcmp(tail, ":gc")) {
2071 FLAG_SET_CMDLINE(bool, PrintGC, true);
2072 } else if (!strcmp(tail, ":jni")) {
2073 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2074 }
2075 // -da / -ea / -disableassertions / -enableassertions
2076 // These accept an optional class/package name separated by a colon, e.g.,
2077 // -da:java.lang.Thread.
2078 } else if (match_option(option, user_assertion_options, &tail, true)) {
2079 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2080 if (*tail == '\0') {
2081 JavaAssertions::setUserClassDefault(enable);
2082 } else {
2083 assert(*tail == ':', "bogus match by match_option()");
2084 JavaAssertions::addOption(tail + 1, enable);
2085 }
2086 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2087 } else if (match_option(option, system_assertion_options, &tail, false)) {
2088 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2089 JavaAssertions::setSystemClassDefault(enable);
2090 // -bootclasspath:
2091 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2092 scp_p->reset_path(tail);
2093 *scp_assembly_required_p = true;
2094 // -bootclasspath/a:
2095 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2096 scp_p->add_suffix(tail);
2097 *scp_assembly_required_p = true;
2098 // -bootclasspath/p:
2099 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2100 scp_p->add_prefix(tail);
2101 *scp_assembly_required_p = true;
2102 // -Xrun
2103 } else if (match_option(option, "-Xrun", &tail)) {
2104 if (tail != NULL) {
2105 const char* pos = strchr(tail, ':');
2106 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2107 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2108 name[len] = '\0';
2109
2110 char *options = NULL;
2111 if(pos != NULL) {
2112 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2113 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2114 }
2115 #ifdef JVMTI_KERNEL
2116 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2117 warning("profiling and debugging agents are not supported with Kernel VM");
2118 } else
2119 #endif // JVMTI_KERNEL
2120 add_init_library(name, options);
2121 }
2122 // -agentlib and -agentpath
2123 } else if (match_option(option, "-agentlib:", &tail) ||
2124 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2125 if(tail != NULL) {
2126 const char* pos = strchr(tail, '=');
2127 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2128 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2129 name[len] = '\0';
2130
2131 char *options = NULL;
2132 if(pos != NULL) {
2133 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2134 }
2135 #ifdef JVMTI_KERNEL
2136 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2137 warning("profiling and debugging agents are not supported with Kernel VM");
2138 } else
2139 #endif // JVMTI_KERNEL
2140 add_init_agent(name, options, is_absolute_path);
2141
2142 }
2143 // -javaagent
2144 } else if (match_option(option, "-javaagent:", &tail)) {
2145 if(tail != NULL) {
2146 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2147 add_init_agent("instrument", options, false);
2148 }
2149 // -Xnoclassgc
2150 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2151 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2152 // -Xincgc: i-CMS
2153 } else if (match_option(option, "-Xincgc", &tail)) {
2154 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2155 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2156 // -Xnoincgc: no i-CMS
2157 } else if (match_option(option, "-Xnoincgc", &tail)) {
2158 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2159 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2160 // -Xconcgc
2161 } else if (match_option(option, "-Xconcgc", &tail)) {
2162 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2163 // -Xnoconcgc
2164 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2165 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2166 // -Xbatch
2167 } else if (match_option(option, "-Xbatch", &tail)) {
2168 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2169 // -Xmn for compatibility with other JVM vendors
2170 } else if (match_option(option, "-Xmn", &tail)) {
2171 julong long_initial_eden_size = 0;
2172 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2173 if (errcode != arg_in_range) {
2174 jio_fprintf(defaultStream::error_stream(),
2175 "Invalid initial eden size: %s\n", option->optionString);
2176 describe_range_error(errcode);
2177 return JNI_EINVAL;
2178 }
2179 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2180 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2181 // -Xms
2182 } else if (match_option(option, "-Xms", &tail)) {
2183 julong long_initial_heap_size = 0;
2184 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2185 if (errcode != arg_in_range) {
2186 jio_fprintf(defaultStream::error_stream(),
2187 "Invalid initial heap size: %s\n", option->optionString);
2188 describe_range_error(errcode);
2189 return JNI_EINVAL;
2190 }
2191 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2192 // Currently the minimum size and the initial heap sizes are the same.
2193 set_min_heap_size(InitialHeapSize);
2194 // -Xmx
2195 } else if (match_option(option, "-Xmx", &tail)) {
2196 julong long_max_heap_size = 0;
2197 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2198 if (errcode != arg_in_range) {
2199 jio_fprintf(defaultStream::error_stream(),
2200 "Invalid maximum heap size: %s\n", option->optionString);
2201 describe_range_error(errcode);
2202 return JNI_EINVAL;
2203 }
2204 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2205 // Xmaxf
2206 } else if (match_option(option, "-Xmaxf", &tail)) {
2207 int maxf = (int)(atof(tail) * 100);
2208 if (maxf < 0 || maxf > 100) {
2209 jio_fprintf(defaultStream::error_stream(),
2210 "Bad max heap free percentage size: %s\n",
2211 option->optionString);
2212 return JNI_EINVAL;
2213 } else {
2214 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2215 }
2216 // Xminf
2217 } else if (match_option(option, "-Xminf", &tail)) {
2218 int minf = (int)(atof(tail) * 100);
2219 if (minf < 0 || minf > 100) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Bad min heap free percentage size: %s\n",
2222 option->optionString);
2223 return JNI_EINVAL;
2224 } else {
2225 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2226 }
2227 // -Xss
2228 } else if (match_option(option, "-Xss", &tail)) {
2229 julong long_ThreadStackSize = 0;
2230 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2231 if (errcode != arg_in_range) {
2232 jio_fprintf(defaultStream::error_stream(),
2233 "Invalid thread stack size: %s\n", option->optionString);
2234 describe_range_error(errcode);
2235 return JNI_EINVAL;
2236 }
2237 // Internally track ThreadStackSize in units of 1024 bytes.
2238 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2239 round_to((int)long_ThreadStackSize, K) / K);
2240 // -Xoss
2241 } else if (match_option(option, "-Xoss", &tail)) {
2242 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2243 // -Xmaxjitcodesize
2244 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2245 julong long_ReservedCodeCacheSize = 0;
2246 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2247 (size_t)InitialCodeCacheSize);
2248 if (errcode != arg_in_range) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "Invalid maximum code cache size: %s\n",
2251 option->optionString);
2252 describe_range_error(errcode);
2253 return JNI_EINVAL;
2254 }
2255 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2256 // -green
2257 } else if (match_option(option, "-green", &tail)) {
2258 jio_fprintf(defaultStream::error_stream(),
2259 "Green threads support not available\n");
2260 return JNI_EINVAL;
2261 // -native
2262 } else if (match_option(option, "-native", &tail)) {
2263 // HotSpot always uses native threads, ignore silently for compatibility
2264 // -Xsqnopause
2265 } else if (match_option(option, "-Xsqnopause", &tail)) {
2266 // EVM option, ignore silently for compatibility
2267 // -Xrs
2268 } else if (match_option(option, "-Xrs", &tail)) {
2269 // Classic/EVM option, new functionality
2270 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2271 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2272 // change default internal VM signals used - lower case for back compat
2273 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2274 // -Xoptimize
2275 } else if (match_option(option, "-Xoptimize", &tail)) {
2276 // EVM option, ignore silently for compatibility
2277 // -Xprof
2278 } else if (match_option(option, "-Xprof", &tail)) {
2279 #ifndef FPROF_KERNEL
2280 _has_profile = true;
2281 #else // FPROF_KERNEL
2282 // do we have to exit?
2283 warning("Kernel VM does not support flat profiling.");
2284 #endif // FPROF_KERNEL
2285 // -Xaprof
2286 } else if (match_option(option, "-Xaprof", &tail)) {
2287 _has_alloc_profile = true;
2288 // -Xconcurrentio
2289 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2290 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2291 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2292 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2293 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2294 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2295
2296 // -Xinternalversion
2297 } else if (match_option(option, "-Xinternalversion", &tail)) {
2298 jio_fprintf(defaultStream::output_stream(), "%s\n",
2299 VM_Version::internal_vm_info_string());
2300 vm_exit(0);
2301 #ifndef PRODUCT
2302 // -Xprintflags
2303 } else if (match_option(option, "-Xprintflags", &tail)) {
2304 CommandLineFlags::printFlags();
2305 vm_exit(0);
2306 #endif
2307 // -D
2308 } else if (match_option(option, "-D", &tail)) {
2309 if (!add_property(tail)) {
2310 return JNI_ENOMEM;
2311 }
2312 // Out of the box management support
2313 if (match_option(option, "-Dcom.sun.management", &tail)) {
2314 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2315 }
2316 // -Xint
2317 } else if (match_option(option, "-Xint", &tail)) {
2318 set_mode_flags(_int);
2319 // -Xmixed
2320 } else if (match_option(option, "-Xmixed", &tail)) {
2321 set_mode_flags(_mixed);
2322 // -Xcomp
2323 } else if (match_option(option, "-Xcomp", &tail)) {
2324 // for testing the compiler; turn off all flags that inhibit compilation
2325 set_mode_flags(_comp);
2326
2327 // -Xshare:dump
2328 } else if (match_option(option, "-Xshare:dump", &tail)) {
2329 #ifdef TIERED
2330 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2331 set_mode_flags(_int); // Prevent compilation, which creates objects
2332 #elif defined(COMPILER2)
2333 vm_exit_during_initialization(
2334 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2335 #elif defined(KERNEL)
2336 vm_exit_during_initialization(
2337 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2338 #else
2339 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2340 set_mode_flags(_int); // Prevent compilation, which creates objects
2341 #endif
2342 // -Xshare:on
2343 } else if (match_option(option, "-Xshare:on", &tail)) {
2344 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2345 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2346 #ifdef TIERED
2347 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2348 #endif // TIERED
2349 // -Xshare:auto
2350 } else if (match_option(option, "-Xshare:auto", &tail)) {
2351 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2352 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2353 // -Xshare:off
2354 } else if (match_option(option, "-Xshare:off", &tail)) {
2355 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2356 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2357
2358 // -Xverify
2359 } else if (match_option(option, "-Xverify", &tail)) {
2360 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2361 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2362 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2363 } else if (strcmp(tail, ":remote") == 0) {
2364 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2365 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2366 } else if (strcmp(tail, ":none") == 0) {
2367 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2368 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2369 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2370 return JNI_EINVAL;
2371 }
2372 // -Xdebug
2373 } else if (match_option(option, "-Xdebug", &tail)) {
2374 // note this flag has been used, then ignore
2375 set_xdebug_mode(true);
2376 // -Xnoagent
2377 } else if (match_option(option, "-Xnoagent", &tail)) {
2378 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2379 } else if (match_option(option, "-Xboundthreads", &tail)) {
2380 // Bind user level threads to kernel threads (Solaris only)
2381 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2382 } else if (match_option(option, "-Xloggc:", &tail)) {
2383 // Redirect GC output to the file. -Xloggc:<filename>
2384 // ostream_init_log(), when called will use this filename
2385 // to initialize a fileStream.
2386 _gc_log_filename = strdup(tail);
2387 FLAG_SET_CMDLINE(bool, PrintGC, true);
2388 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2389 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2390
2391 // JNI hooks
2392 } else if (match_option(option, "-Xcheck", &tail)) {
2393 if (!strcmp(tail, ":jni")) {
2394 CheckJNICalls = true;
2395 } else if (is_bad_option(option, args->ignoreUnrecognized,
2396 "check")) {
2397 return JNI_EINVAL;
2398 }
2399 } else if (match_option(option, "vfprintf", &tail)) {
2400 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2401 } else if (match_option(option, "exit", &tail)) {
2402 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2403 } else if (match_option(option, "abort", &tail)) {
2404 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2405 // -XX:+AggressiveHeap
2406 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2407
2408 // This option inspects the machine and attempts to set various
2409 // parameters to be optimal for long-running, memory allocation
2410 // intensive jobs. It is intended for machines with large
2411 // amounts of cpu and memory.
2412
2413 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2414 // VM, but we may not be able to represent the total physical memory
2415 // available (like having 8gb of memory on a box but using a 32bit VM).
2416 // Thus, we need to make sure we're using a julong for intermediate
2417 // calculations.
2418 julong initHeapSize;
2419 julong total_memory = os::physical_memory();
2420
2421 if (total_memory < (julong)256*M) {
2422 jio_fprintf(defaultStream::error_stream(),
2423 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2424 vm_exit(1);
2425 }
2426
2427 // The heap size is half of available memory, or (at most)
2428 // all of possible memory less 160mb (leaving room for the OS
2429 // when using ISM). This is the maximum; because adaptive sizing
2430 // is turned on below, the actual space used may be smaller.
2431
2432 initHeapSize = MIN2(total_memory / (julong)2,
2433 total_memory - (julong)160*M);
2434
2435 // Make sure that if we have a lot of memory we cap the 32 bit
2436 // process space. The 64bit VM version of this function is a nop.
2437 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2438
2439 // The perm gen is separate but contiguous with the
2440 // object heap (and is reserved with it) so subtract it
2441 // from the heap size.
2442 if (initHeapSize > MaxPermSize) {
2443 initHeapSize = initHeapSize - MaxPermSize;
2444 } else {
2445 warning("AggressiveHeap and MaxPermSize values may conflict");
2446 }
2447
2448 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2449 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2450 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2451 // Currently the minimum size and the initial heap sizes are the same.
2452 set_min_heap_size(initHeapSize);
2453 }
2454 if (FLAG_IS_DEFAULT(NewSize)) {
2455 // Make the young generation 3/8ths of the total heap.
2456 FLAG_SET_CMDLINE(uintx, NewSize,
2457 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2458 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2459 }
2460
2461 FLAG_SET_DEFAULT(UseLargePages, true);
2462
2463 // Increase some data structure sizes for efficiency
2464 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2465 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2466 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2467
2468 // See the OldPLABSize comment below, but replace 'after promotion'
2469 // with 'after copying'. YoungPLABSize is the size of the survivor
2470 // space per-gc-thread buffers. The default is 4kw.
2471 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2472
2473 // OldPLABSize is the size of the buffers in the old gen that
2474 // UseParallelGC uses to promote live data that doesn't fit in the
2475 // survivor spaces. At any given time, there's one for each gc thread.
2476 // The default size is 1kw. These buffers are rarely used, since the
2477 // survivor spaces are usually big enough. For specjbb, however, there
2478 // are occasions when there's lots of live data in the young gen
2479 // and we end up promoting some of it. We don't have a definite
2480 // explanation for why bumping OldPLABSize helps, but the theory
2481 // is that a bigger PLAB results in retaining something like the
2482 // original allocation order after promotion, which improves mutator
2483 // locality. A minor effect may be that larger PLABs reduce the
2484 // number of PLAB allocation events during gc. The value of 8kw
2485 // was arrived at by experimenting with specjbb.
2486 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2487
2488 // CompilationPolicyChoice=0 causes the server compiler to adopt
2489 // a more conservative which-method-do-I-compile policy when one
2490 // of the counters maintained by the interpreter trips. The
2491 // result is reduced startup time and improved specjbb and
2492 // alacrity performance. Zero is the default, but we set it
2493 // explicitly here in case the default changes.
2494 // See runtime/compilationPolicy.*.
2495 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2496
2497 // Enable parallel GC and adaptive generation sizing
2498 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2499 FLAG_SET_DEFAULT(ParallelGCThreads,
2500 Abstract_VM_Version::parallel_worker_threads());
2501
2502 // Encourage steady state memory management
2503 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2504
2505 // This appears to improve mutator locality
2506 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2507
2508 // Get around early Solaris scheduling bug
2509 // (affinity vs other jobs on system)
2510 // but disallow DR and offlining (5008695).
2511 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2512
2513 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2514 // The last option must always win.
2515 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2516 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2517 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2518 // The last option must always win.
2519 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2520 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2521 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2522 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Please use CMSClassUnloadingEnabled in place of "
2525 "CMSPermGenSweepingEnabled in the future\n");
2526 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2527 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Please use -XX:+UseGCOverheadLimit in place of "
2530 "-XX:+UseGCTimeLimit in the future\n");
2531 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2532 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2533 jio_fprintf(defaultStream::error_stream(),
2534 "Please use -XX:-UseGCOverheadLimit in place of "
2535 "-XX:-UseGCTimeLimit in the future\n");
2536 // The TLE options are for compatibility with 1.3 and will be
2537 // removed without notice in a future release. These options
2538 // are not to be documented.
2539 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2540 // No longer used.
2541 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2542 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2543 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2544 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2545 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2546 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2547 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2548 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2549 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2550 // No longer used.
2551 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2552 julong long_tlab_size = 0;
2553 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2554 if (errcode != arg_in_range) {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Invalid TLAB size: %s\n", option->optionString);
2557 describe_range_error(errcode);
2558 return JNI_EINVAL;
2559 }
2560 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2561 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2562 // No longer used.
2563 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2564 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2565 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2566 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2567 SOLARIS_ONLY(
2568 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2569 warning("-XX:+UsePermISM is obsolete.");
2570 FLAG_SET_CMDLINE(bool, UseISM, true);
2571 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2572 FLAG_SET_CMDLINE(bool, UseISM, false);
2573 )
2574 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2575 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2576 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2577 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2578 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2579 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2580 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2581 #ifdef SOLARIS
2582 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2583 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2584 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2585 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2586 #else // ndef SOLARIS
2587 jio_fprintf(defaultStream::error_stream(),
2588 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2589 return JNI_EINVAL;
2590 #endif // ndef SOLARIS
2591 #ifdef ASSERT
2592 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2593 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2594 // disable scavenge before parallel mark-compact
2595 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2596 #endif
2597 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2598 julong cms_blocks_to_claim = (julong)atol(tail);
2599 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Please use -XX:OldPLABSize in place of "
2602 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2603 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2604 julong cms_blocks_to_claim = (julong)atol(tail);
2605 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2606 jio_fprintf(defaultStream::error_stream(),
2607 "Please use -XX:OldPLABSize in place of "
2608 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2609 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2610 julong old_plab_size = 0;
2611 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2612 if (errcode != arg_in_range) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid old PLAB size: %s\n", option->optionString);
2615 describe_range_error(errcode);
2616 return JNI_EINVAL;
2617 }
2618 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2619 jio_fprintf(defaultStream::error_stream(),
2620 "Please use -XX:OldPLABSize in place of "
2621 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2622 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2623 julong young_plab_size = 0;
2624 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2625 if (errcode != arg_in_range) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Invalid young PLAB size: %s\n", option->optionString);
2628 describe_range_error(errcode);
2629 return JNI_EINVAL;
2630 }
2631 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Please use -XX:YoungPLABSize in place of "
2634 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2635 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2636 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2637 julong stack_size = 0;
2638 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2639 if (errcode != arg_in_range) {
2640 jio_fprintf(defaultStream::error_stream(),
2641 "Invalid mark stack size: %s\n", option->optionString);
2642 describe_range_error(errcode);
2643 return JNI_EINVAL;
2644 }
2645 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2646 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2647 julong max_stack_size = 0;
2648 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid maximum mark stack size: %s\n",
2652 option->optionString);
2653 describe_range_error(errcode);
2654 return JNI_EINVAL;
2655 }
2656 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2657 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2658 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2659 uintx conc_threads = 0;
2660 if (!parse_uintx(tail, &conc_threads, 1)) {
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Invalid concurrent threads: %s\n", option->optionString);
2663 return JNI_EINVAL;
2664 }
2665 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2666 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2667 // Skip -XX:Flags= since that case has already been handled
2668 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2669 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2670 return JNI_EINVAL;
2671 }
2672 }
2673 // Unknown option
2674 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2675 return JNI_ERR;
2676 }
2677 }
2678 // Change the default value for flags which have different default values
2679 // when working with older JDKs.
2680 if (JDK_Version::current().compare_major(6) <= 0 &&
2681 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2682 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2683 }
2684 #ifdef LINUX
2685 if (JDK_Version::current().compare_major(6) <= 0 &&
2686 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2687 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2688 }
2689 #endif // LINUX
2690 return JNI_OK;
2691 }
2692
2693 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2694 // This must be done after all -D arguments have been processed.
2695 scp_p->expand_endorsed();
2696
2697 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2698 // Assemble the bootclasspath elements into the final path.
2699 Arguments::set_sysclasspath(scp_p->combined_path());
2700 }
2701
2702 // This must be done after all arguments have been processed.
2703 // java_compiler() true means set to "NONE" or empty.
2704 if (java_compiler() && !xdebug_mode()) {
2705 // For backwards compatibility, we switch to interpreted mode if
2706 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2707 // not specified.
2708 set_mode_flags(_int);
2709 }
2710 if (CompileThreshold == 0) {
2711 set_mode_flags(_int);
2712 }
2713
2714 #ifndef COMPILER2
2715 // Don't degrade server performance for footprint
2716 if (FLAG_IS_DEFAULT(UseLargePages) &&
2717 MaxHeapSize < LargePageHeapSizeThreshold) {
2718 // No need for large granularity pages w/small heaps.
2719 // Note that large pages are enabled/disabled for both the
2720 // Java heap and the code cache.
2721 FLAG_SET_DEFAULT(UseLargePages, false);
2722 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2723 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2724 }
2725
2726 // Tiered compilation is undefined with C1.
2727 TieredCompilation = false;
2728 #else
2729 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2730 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2731 }
2732 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2733 if (UseG1GC) {
2734 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2735 }
2736 #endif
2737
2738 // If we are running in a headless jre, force java.awt.headless property
2739 // to be true unless the property has already been set.
2740 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2741 if (os::is_headless_jre()) {
2742 const char* headless = Arguments::get_property("java.awt.headless");
2743 if (headless == NULL) {
2744 char envbuffer[128];
2745 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2746 if (!add_property("java.awt.headless=true")) {
2747 return JNI_ENOMEM;
2748 }
2749 } else {
2750 char buffer[256];
2751 strcpy(buffer, "java.awt.headless=");
2752 strcat(buffer, envbuffer);
2753 if (!add_property(buffer)) {
2754 return JNI_ENOMEM;
2755 }
2756 }
2757 }
2758 }
2759
2760 if (!check_vm_args_consistency()) {
2761 return JNI_ERR;
2762 }
2763
2764 return JNI_OK;
2765 }
2766
2767 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2768 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2769 scp_assembly_required_p);
2770 }
2771
2772 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2773 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2774 scp_assembly_required_p);
2775 }
2776
2777 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2778 const int N_MAX_OPTIONS = 64;
2779 const int OPTION_BUFFER_SIZE = 1024;
2780 char buffer[OPTION_BUFFER_SIZE];
2781
2782 // The variable will be ignored if it exceeds the length of the buffer.
2783 // Don't check this variable if user has special privileges
2784 // (e.g. unix su command).
2785 if (os::getenv(name, buffer, sizeof(buffer)) &&
2786 !os::have_special_privileges()) {
2787 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2788 jio_fprintf(defaultStream::error_stream(),
2789 "Picked up %s: %s\n", name, buffer);
2790 char* rd = buffer; // pointer to the input string (rd)
2791 int i;
2792 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2793 while (isspace(*rd)) rd++; // skip whitespace
2794 if (*rd == 0) break; // we re done when the input string is read completely
2795
2796 // The output, option string, overwrites the input string.
2797 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2798 // input string (rd).
2799 char* wrt = rd;
2800
2801 options[i++].optionString = wrt; // Fill in option
2802 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2803 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2804 int quote = *rd; // matching quote to look for
2805 rd++; // don't copy open quote
2806 while (*rd != quote) { // include everything (even spaces) up until quote
2807 if (*rd == 0) { // string termination means unmatched string
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Unmatched quote in %s\n", name);
2810 return JNI_ERR;
2811 }
2812 *wrt++ = *rd++; // copy to option string
2813 }
2814 rd++; // don't copy close quote
2815 } else {
2816 *wrt++ = *rd++; // copy to option string
2817 }
2818 }
2819 // Need to check if we're done before writing a NULL,
2820 // because the write could be to the byte that rd is pointing to.
2821 if (*rd++ == 0) {
2822 *wrt = 0;
2823 break;
2824 }
2825 *wrt = 0; // Zero terminate option
2826 }
2827 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2828 JavaVMInitArgs vm_args;
2829 vm_args.version = JNI_VERSION_1_2;
2830 vm_args.options = options;
2831 vm_args.nOptions = i;
2832 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2833
2834 if (PrintVMOptions) {
2835 const char* tail;
2836 for (int i = 0; i < vm_args.nOptions; i++) {
2837 const JavaVMOption *option = vm_args.options + i;
2838 if (match_option(option, "-XX:", &tail)) {
2839 logOption(tail);
2840 }
2841 }
2842 }
2843
2844 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2845 }
2846 return JNI_OK;
2847 }
2848
2849 // Parse entry point called from JNI_CreateJavaVM
2850
2851 jint Arguments::parse(const JavaVMInitArgs* args) {
2852
2853 // Sharing support
2854 // Construct the path to the archive
2855 char jvm_path[JVM_MAXPATHLEN];
2856 os::jvm_path(jvm_path, sizeof(jvm_path));
2857 #ifdef TIERED
2858 if (strstr(jvm_path, "client") != NULL) {
2859 force_client_mode = true;
2860 }
2861 #endif // TIERED
2862 char *end = strrchr(jvm_path, *os::file_separator());
2863 if (end != NULL) *end = '\0';
2864 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2865 strlen(os::file_separator()) + 20);
2866 if (shared_archive_path == NULL) return JNI_ENOMEM;
2867 strcpy(shared_archive_path, jvm_path);
2868 strcat(shared_archive_path, os::file_separator());
2869 strcat(shared_archive_path, "classes");
2870 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2871 strcat(shared_archive_path, ".jsa");
2872 SharedArchivePath = shared_archive_path;
2873
2874 // Remaining part of option string
2875 const char* tail;
2876
2877 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2878 bool settings_file_specified = false;
2879 const char* flags_file;
2880 int index;
2881 for (index = 0; index < args->nOptions; index++) {
2882 const JavaVMOption *option = args->options + index;
2883 if (match_option(option, "-XX:Flags=", &tail)) {
2884 flags_file = tail;
2885 settings_file_specified = true;
2886 }
2887 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2888 PrintVMOptions = true;
2889 }
2890 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2891 PrintVMOptions = false;
2892 }
2893 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2894 IgnoreUnrecognizedVMOptions = true;
2895 }
2896 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2897 IgnoreUnrecognizedVMOptions = false;
2898 }
2899 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2900 CommandLineFlags::printFlags();
2901 vm_exit(0);
2902 }
2903
2904 #ifndef PRODUCT
2905 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2906 CommandLineFlags::printFlags(true);
2907 vm_exit(0);
2908 }
2909 #endif
2910 }
2911
2912 if (IgnoreUnrecognizedVMOptions) {
2913 // uncast const to modify the flag args->ignoreUnrecognized
2914 *(jboolean*)(&args->ignoreUnrecognized) = true;
2915 }
2916
2917 // Parse specified settings file
2918 if (settings_file_specified) {
2919 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2920 return JNI_EINVAL;
2921 }
2922 }
2923
2924 // Parse default .hotspotrc settings file
2925 if (!settings_file_specified) {
2926 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2927 return JNI_EINVAL;
2928 }
2929 }
2930
2931 if (PrintVMOptions) {
2932 for (index = 0; index < args->nOptions; index++) {
2933 const JavaVMOption *option = args->options + index;
2934 if (match_option(option, "-XX:", &tail)) {
2935 logOption(tail);
2936 }
2937 }
2938 }
2939
2940 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2941 jint result = parse_vm_init_args(args);
2942 if (result != JNI_OK) {
2943 return result;
2944 }
2945
2946 #ifndef PRODUCT
2947 if (TraceBytecodesAt != 0) {
2948 TraceBytecodes = true;
2949 }
2950 if (CountCompiledCalls) {
2951 if (UseCounterDecay) {
2952 warning("UseCounterDecay disabled because CountCalls is set");
2953 UseCounterDecay = false;
2954 }
2955 }
2956 #endif // PRODUCT
2957
2958 if (EnableInvokeDynamic && !EnableMethodHandles) {
2959 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2960 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2961 }
2962 EnableMethodHandles = true;
2963 }
2964 if (EnableMethodHandles && !AnonymousClasses) {
2965 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2966 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2967 }
2968 AnonymousClasses = true;
2969 }
2970 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2971 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2972 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2973 }
2974 ScavengeRootsInCode = 1;
2975 }
2976 #ifdef COMPILER2
2977 if (EnableInvokeDynamic && DoEscapeAnalysis) {
2978 // TODO: We need to find rules for invokedynamic and EA. For now,
2979 // simply disable EA by default.
2980 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2981 DoEscapeAnalysis = false;
2982 }
2983 }
2984 #endif
2985
2986 if (PrintGCDetails) {
2987 // Turn on -verbose:gc options as well
2988 PrintGC = true;
2989 }
2990
2991 #if defined(_LP64) && defined(COMPILER1) && !defined(TIERED)
2992 UseCompressedOops = false;
2993 #endif
2994
2995 #if defined(_LP64)
2996 if ((DumpSharedSpaces || RequireSharedSpaces) && UseCompressedOops) {
2997 // Disable compressed oops with shared spaces
2998 UseCompressedOops = false;
2999 }
3000 #endif
3001
3002 // Set object alignment values.
3003 set_object_alignment();
3004
3005 #ifdef SERIALGC
3006 force_serial_gc();
3007 #endif // SERIALGC
3008 #ifdef KERNEL
3009 no_shared_spaces();
3010 #endif // KERNEL
3011
3012 // Set flags based on ergonomics.
3013 set_ergonomics_flags();
3014
3015 #ifdef _LP64
3016 // XXX JSR 292 currently does not support compressed oops.
3017 if (EnableMethodHandles && UseCompressedOops) {
3018 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
3019 UseCompressedOops = false;
3020 }
3021 }
3022 #endif // _LP64
3023
3024 // Check the GC selections again.
3025 if (!check_gc_consistency()) {
3026 return JNI_EINVAL;
3027 }
3028
3029 if (TieredCompilation) {
3030 set_tiered_flags();
3031 } else {
3032 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3033 if (CompilationPolicyChoice >= 2) {
3034 vm_exit_during_initialization(
3035 "Incompatible compilation policy selected", NULL);
3036 }
3037 }
3038
3039 #ifndef KERNEL
3040 if (UseConcMarkSweepGC) {
3041 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3042 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3043 // are true, we don't call set_parnew_gc_flags() as well.
3044 set_cms_and_parnew_gc_flags();
3045 } else {
3046 // Set heap size based on available physical memory
3047 set_heap_size();
3048 // Set per-collector flags
3049 if (UseParallelGC || UseParallelOldGC) {
3050 set_parallel_gc_flags();
3051 } else if (UseParNewGC) {
3052 set_parnew_gc_flags();
3053 } else if (UseG1GC) {
3054 set_g1_gc_flags();
3055 }
3056 }
3057 #endif // KERNEL
3058
3059 #ifdef SERIALGC
3060 assert(verify_serial_gc_flags(), "SerialGC unset");
3061 #endif // SERIALGC
3062
3063 // Set bytecode rewriting flags
3064 set_bytecode_flags();
3065
3066 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3067 set_aggressive_opts_flags();
3068
3069 #ifdef CC_INTERP
3070 // Clear flags not supported by the C++ interpreter
3071 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3072 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3073 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3074 #endif // CC_INTERP
3075
3076 #ifdef COMPILER2
3077 if (!UseBiasedLocking || EmitSync != 0) {
3078 UseOptoBiasInlining = false;
3079 }
3080 #endif
3081
3082 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3083 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3084 DebugNonSafepoints = true;
3085 }
3086
3087 #ifndef PRODUCT
3088 if (CompileTheWorld) {
3089 // Force NmethodSweeper to sweep whole CodeCache each time.
3090 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3091 NmethodSweepFraction = 1;
3092 }
3093 }
3094 #endif
3095
3096 if (PrintCommandLineFlags) {
3097 CommandLineFlags::printSetFlags();
3098 }
3099
3100 // Apply CPU specific policy for the BiasedLocking
3101 if (UseBiasedLocking) {
3102 if (!VM_Version::use_biased_locking() &&
3103 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3104 UseBiasedLocking = false;
3105 }
3106 }
3107
3108 return JNI_OK;
3109 }
3110
3111 int Arguments::PropertyList_count(SystemProperty* pl) {
3112 int count = 0;
3113 while(pl != NULL) {
3114 count++;
3115 pl = pl->next();
3116 }
3117 return count;
3118 }
3119
3120 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3121 assert(key != NULL, "just checking");
3122 SystemProperty* prop;
3123 for (prop = pl; prop != NULL; prop = prop->next()) {
3124 if (strcmp(key, prop->key()) == 0) return prop->value();
3125 }
3126 return NULL;
3127 }
3128
3129 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3130 int count = 0;
3131 const char* ret_val = NULL;
3132
3133 while(pl != NULL) {
3134 if(count >= index) {
3135 ret_val = pl->key();
3136 break;
3137 }
3138 count++;
3139 pl = pl->next();
3140 }
3141
3142 return ret_val;
3143 }
3144
3145 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3146 int count = 0;
3147 char* ret_val = NULL;
3148
3149 while(pl != NULL) {
3150 if(count >= index) {
3151 ret_val = pl->value();
3152 break;
3153 }
3154 count++;
3155 pl = pl->next();
3156 }
3157
3158 return ret_val;
3159 }
3160
3161 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3162 SystemProperty* p = *plist;
3163 if (p == NULL) {
3164 *plist = new_p;
3165 } else {
3166 while (p->next() != NULL) {
3167 p = p->next();
3168 }
3169 p->set_next(new_p);
3170 }
3171 }
3172
3173 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3174 if (plist == NULL)
3175 return;
3176
3177 SystemProperty* new_p = new SystemProperty(k, v, true);
3178 PropertyList_add(plist, new_p);
3179 }
3180
3181 // This add maintains unique property key in the list.
3182 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3183 if (plist == NULL)
3184 return;
3185
3186 // If property key exist then update with new value.
3187 SystemProperty* prop;
3188 for (prop = *plist; prop != NULL; prop = prop->next()) {
3189 if (strcmp(k, prop->key()) == 0) {
3190 if (append) {
3191 prop->append_value(v);
3192 } else {
3193 prop->set_value(v);
3194 }
3195 return;
3196 }
3197 }
3198
3199 PropertyList_add(plist, k, v);
3200 }
3201
3202 #ifdef KERNEL
3203 char *Arguments::get_kernel_properties() {
3204 // Find properties starting with kernel and append them to string
3205 // We need to find out how long they are first because the URL's that they
3206 // might point to could get long.
3207 int length = 0;
3208 SystemProperty* prop;
3209 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3210 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3211 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3212 }
3213 }
3214 // Add one for null terminator.
3215 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3216 if (length != 0) {
3217 int pos = 0;
3218 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3219 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3220 jio_snprintf(&props[pos], length-pos,
3221 "-D%s=%s ", prop->key(), prop->value());
3222 pos = strlen(props);
3223 }
3224 }
3225 }
3226 // null terminate props in case of null
3227 props[length] = '\0';
3228 return props;
3229 }
3230 #endif // KERNEL
3231
3232 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3233 // Returns true if all of the source pointed by src has been copied over to
3234 // the destination buffer pointed by buf. Otherwise, returns false.
3235 // Notes:
3236 // 1. If the length (buflen) of the destination buffer excluding the
3237 // NULL terminator character is not long enough for holding the expanded
3238 // pid characters, it also returns false instead of returning the partially
3239 // expanded one.
3240 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3241 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3242 char* buf, size_t buflen) {
3243 const char* p = src;
3244 char* b = buf;
3245 const char* src_end = &src[srclen];
3246 char* buf_end = &buf[buflen - 1];
3247
3248 while (p < src_end && b < buf_end) {
3249 if (*p == '%') {
3250 switch (*(++p)) {
3251 case '%': // "%%" ==> "%"
3252 *b++ = *p++;
3253 break;
3254 case 'p': { // "%p" ==> current process id
3255 // buf_end points to the character before the last character so
3256 // that we could write '\0' to the end of the buffer.
3257 size_t buf_sz = buf_end - b + 1;
3258 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3259
3260 // if jio_snprintf fails or the buffer is not long enough to hold
3261 // the expanded pid, returns false.
3262 if (ret < 0 || ret >= (int)buf_sz) {
3263 return false;
3264 } else {
3265 b += ret;
3266 assert(*b == '\0', "fail in copy_expand_pid");
3267 if (p == src_end && b == buf_end + 1) {
3268 // reach the end of the buffer.
3269 return true;
3270 }
3271 }
3272 p++;
3273 break;
3274 }
3275 default :
3276 *b++ = '%';
3277 }
3278 } else {
3279 *b++ = *p++;
3280 }
3281 }
3282 *b = '\0';
3283 return (p == src_end); // return false if not all of the source was copied
3284 }