Sat, 28 Mar 2009 15:47:29 -0700
6819891: ParNew: Fix work queue overflow code to deal correctly with +UseCompressedOops
Summary: When using compressed oops, rather than chaining the overflowed grey objects' pre-images through their klass words, we use GC-worker thread-local overflow stacks.
Reviewed-by: jcoomes, jmasa
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_arguments.cpp.incl"
28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
29 #define DEFAULT_JAVA_LAUNCHER "generic"
31 char** Arguments::_jvm_flags_array = NULL;
32 int Arguments::_num_jvm_flags = 0;
33 char** Arguments::_jvm_args_array = NULL;
34 int Arguments::_num_jvm_args = 0;
35 char* Arguments::_java_command = NULL;
36 SystemProperty* Arguments::_system_properties = NULL;
37 const char* Arguments::_gc_log_filename = NULL;
38 bool Arguments::_has_profile = false;
39 bool Arguments::_has_alloc_profile = false;
40 uintx Arguments::_initial_heap_size = 0;
41 uintx Arguments::_min_heap_size = 0;
42 Arguments::Mode Arguments::_mode = _mixed;
43 bool Arguments::_java_compiler = false;
44 bool Arguments::_xdebug_mode = false;
45 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
46 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
47 int Arguments::_sun_java_launcher_pid = -1;
49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
50 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
51 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
52 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
53 bool Arguments::_ClipInlining = ClipInlining;
54 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
56 char* Arguments::SharedArchivePath = NULL;
58 AgentLibraryList Arguments::_libraryList;
59 AgentLibraryList Arguments::_agentList;
61 abort_hook_t Arguments::_abort_hook = NULL;
62 exit_hook_t Arguments::_exit_hook = NULL;
63 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
66 SystemProperty *Arguments::_java_ext_dirs = NULL;
67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
69 SystemProperty *Arguments::_java_library_path = NULL;
70 SystemProperty *Arguments::_java_home = NULL;
71 SystemProperty *Arguments::_java_class_path = NULL;
72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
74 char* Arguments::_meta_index_path = NULL;
75 char* Arguments::_meta_index_dir = NULL;
77 static bool force_client_mode = false;
79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
81 static bool match_option(const JavaVMOption *option, const char* name,
82 const char** tail) {
83 int len = (int)strlen(name);
84 if (strncmp(option->optionString, name, len) == 0) {
85 *tail = option->optionString + len;
86 return true;
87 } else {
88 return false;
89 }
90 }
92 static void logOption(const char* opt) {
93 if (PrintVMOptions) {
94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
95 }
96 }
98 // Process java launcher properties.
99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
100 // See if sun.java.launcher or sun.java.launcher.pid is defined.
101 // Must do this before setting up other system properties,
102 // as some of them may depend on launcher type.
103 for (int index = 0; index < args->nOptions; index++) {
104 const JavaVMOption* option = args->options + index;
105 const char* tail;
107 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
108 process_java_launcher_argument(tail, option->extraInfo);
109 continue;
110 }
111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
112 _sun_java_launcher_pid = atoi(tail);
113 continue;
114 }
115 }
116 }
118 // Initialize system properties key and value.
119 void Arguments::init_system_properties() {
121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
123 "Java Virtual Machine Specification", false));
124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
125 "Sun Microsystems Inc.", false));
126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
131 // following are JVMTI agent writeable properties.
132 // Properties values are set to NULL and they are
133 // os specific they are initialized in os::init_system_properties_values().
134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
137 _java_library_path = new SystemProperty("java.library.path", NULL, true);
138 _java_home = new SystemProperty("java.home", NULL, true);
139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
141 _java_class_path = new SystemProperty("java.class.path", "", true);
143 // Add to System Property list.
144 PropertyList_add(&_system_properties, _java_ext_dirs);
145 PropertyList_add(&_system_properties, _java_endorsed_dirs);
146 PropertyList_add(&_system_properties, _sun_boot_library_path);
147 PropertyList_add(&_system_properties, _java_library_path);
148 PropertyList_add(&_system_properties, _java_home);
149 PropertyList_add(&_system_properties, _java_class_path);
150 PropertyList_add(&_system_properties, _sun_boot_class_path);
152 // Set OS specific system properties values
153 os::init_system_properties_values();
154 }
156 /**
157 * Provide a slightly more user-friendly way of eliminating -XX flags.
158 * When a flag is eliminated, it can be added to this list in order to
159 * continue accepting this flag on the command-line, while issuing a warning
160 * and ignoring the value. Once the JDK version reaches the 'accept_until'
161 * limit, we flatly refuse to admit the existence of the flag. This allows
162 * a flag to die correctly over JDK releases using HSX.
163 */
164 typedef struct {
165 const char* name;
166 JDK_Version obsoleted_in; // when the flag went away
167 JDK_Version accept_until; // which version to start denying the existence
168 } ObsoleteFlag;
170 static ObsoleteFlag obsolete_jvm_flags[] = {
171 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
172 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
173 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
174 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
175 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
176 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
177 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
178 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
179 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
180 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
181 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
182 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
183 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
184 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
185 { NULL, JDK_Version(0), JDK_Version(0) }
186 };
188 // Returns true if the flag is obsolete and fits into the range specified
189 // for being ignored. In the case that the flag is ignored, the 'version'
190 // value is filled in with the version number when the flag became
191 // obsolete so that that value can be displayed to the user.
192 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
193 int i = 0;
194 assert(version != NULL, "Must provide a version buffer");
195 while (obsolete_jvm_flags[i].name != NULL) {
196 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
197 // <flag>=xxx form
198 // [-|+]<flag> form
199 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
200 ((s[0] == '+' || s[0] == '-') &&
201 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
202 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
203 *version = flag_status.obsoleted_in;
204 return true;
205 }
206 }
207 i++;
208 }
209 return false;
210 }
212 // Constructs the system class path (aka boot class path) from the following
213 // components, in order:
214 //
215 // prefix // from -Xbootclasspath/p:...
216 // endorsed // the expansion of -Djava.endorsed.dirs=...
217 // base // from os::get_system_properties() or -Xbootclasspath=
218 // suffix // from -Xbootclasspath/a:...
219 //
220 // java.endorsed.dirs is a list of directories; any jar or zip files in the
221 // directories are added to the sysclasspath just before the base.
222 //
223 // This could be AllStatic, but it isn't needed after argument processing is
224 // complete.
225 class SysClassPath: public StackObj {
226 public:
227 SysClassPath(const char* base);
228 ~SysClassPath();
230 inline void set_base(const char* base);
231 inline void add_prefix(const char* prefix);
232 inline void add_suffix_to_prefix(const char* suffix);
233 inline void add_suffix(const char* suffix);
234 inline void reset_path(const char* base);
236 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
237 // property. Must be called after all command-line arguments have been
238 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
239 // combined_path().
240 void expand_endorsed();
242 inline const char* get_base() const { return _items[_scp_base]; }
243 inline const char* get_prefix() const { return _items[_scp_prefix]; }
244 inline const char* get_suffix() const { return _items[_scp_suffix]; }
245 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
247 // Combine all the components into a single c-heap-allocated string; caller
248 // must free the string if/when no longer needed.
249 char* combined_path();
251 private:
252 // Utility routines.
253 static char* add_to_path(const char* path, const char* str, bool prepend);
254 static char* add_jars_to_path(char* path, const char* directory);
256 inline void reset_item_at(int index);
258 // Array indices for the items that make up the sysclasspath. All except the
259 // base are allocated in the C heap and freed by this class.
260 enum {
261 _scp_prefix, // from -Xbootclasspath/p:...
262 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
263 _scp_base, // the default sysclasspath
264 _scp_suffix, // from -Xbootclasspath/a:...
265 _scp_nitems // the number of items, must be last.
266 };
268 const char* _items[_scp_nitems];
269 DEBUG_ONLY(bool _expansion_done;)
270 };
272 SysClassPath::SysClassPath(const char* base) {
273 memset(_items, 0, sizeof(_items));
274 _items[_scp_base] = base;
275 DEBUG_ONLY(_expansion_done = false;)
276 }
278 SysClassPath::~SysClassPath() {
279 // Free everything except the base.
280 for (int i = 0; i < _scp_nitems; ++i) {
281 if (i != _scp_base) reset_item_at(i);
282 }
283 DEBUG_ONLY(_expansion_done = false;)
284 }
286 inline void SysClassPath::set_base(const char* base) {
287 _items[_scp_base] = base;
288 }
290 inline void SysClassPath::add_prefix(const char* prefix) {
291 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
292 }
294 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
295 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
296 }
298 inline void SysClassPath::add_suffix(const char* suffix) {
299 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
300 }
302 inline void SysClassPath::reset_item_at(int index) {
303 assert(index < _scp_nitems && index != _scp_base, "just checking");
304 if (_items[index] != NULL) {
305 FREE_C_HEAP_ARRAY(char, _items[index]);
306 _items[index] = NULL;
307 }
308 }
310 inline void SysClassPath::reset_path(const char* base) {
311 // Clear the prefix and suffix.
312 reset_item_at(_scp_prefix);
313 reset_item_at(_scp_suffix);
314 set_base(base);
315 }
317 //------------------------------------------------------------------------------
319 void SysClassPath::expand_endorsed() {
320 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
322 const char* path = Arguments::get_property("java.endorsed.dirs");
323 if (path == NULL) {
324 path = Arguments::get_endorsed_dir();
325 assert(path != NULL, "no default for java.endorsed.dirs");
326 }
328 char* expanded_path = NULL;
329 const char separator = *os::path_separator();
330 const char* const end = path + strlen(path);
331 while (path < end) {
332 const char* tmp_end = strchr(path, separator);
333 if (tmp_end == NULL) {
334 expanded_path = add_jars_to_path(expanded_path, path);
335 path = end;
336 } else {
337 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
338 memcpy(dirpath, path, tmp_end - path);
339 dirpath[tmp_end - path] = '\0';
340 expanded_path = add_jars_to_path(expanded_path, dirpath);
341 FREE_C_HEAP_ARRAY(char, dirpath);
342 path = tmp_end + 1;
343 }
344 }
345 _items[_scp_endorsed] = expanded_path;
346 DEBUG_ONLY(_expansion_done = true;)
347 }
349 // Combine the bootclasspath elements, some of which may be null, into a single
350 // c-heap-allocated string.
351 char* SysClassPath::combined_path() {
352 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
353 assert(_expansion_done, "must call expand_endorsed() first.");
355 size_t lengths[_scp_nitems];
356 size_t total_len = 0;
358 const char separator = *os::path_separator();
360 // Get the lengths.
361 int i;
362 for (i = 0; i < _scp_nitems; ++i) {
363 if (_items[i] != NULL) {
364 lengths[i] = strlen(_items[i]);
365 // Include space for the separator char (or a NULL for the last item).
366 total_len += lengths[i] + 1;
367 }
368 }
369 assert(total_len > 0, "empty sysclasspath not allowed");
371 // Copy the _items to a single string.
372 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
373 char* cp_tmp = cp;
374 for (i = 0; i < _scp_nitems; ++i) {
375 if (_items[i] != NULL) {
376 memcpy(cp_tmp, _items[i], lengths[i]);
377 cp_tmp += lengths[i];
378 *cp_tmp++ = separator;
379 }
380 }
381 *--cp_tmp = '\0'; // Replace the extra separator.
382 return cp;
383 }
385 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
386 char*
387 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
388 char *cp;
390 assert(str != NULL, "just checking");
391 if (path == NULL) {
392 size_t len = strlen(str) + 1;
393 cp = NEW_C_HEAP_ARRAY(char, len);
394 memcpy(cp, str, len); // copy the trailing null
395 } else {
396 const char separator = *os::path_separator();
397 size_t old_len = strlen(path);
398 size_t str_len = strlen(str);
399 size_t len = old_len + str_len + 2;
401 if (prepend) {
402 cp = NEW_C_HEAP_ARRAY(char, len);
403 char* cp_tmp = cp;
404 memcpy(cp_tmp, str, str_len);
405 cp_tmp += str_len;
406 *cp_tmp = separator;
407 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
408 FREE_C_HEAP_ARRAY(char, path);
409 } else {
410 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
411 char* cp_tmp = cp + old_len;
412 *cp_tmp = separator;
413 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
414 }
415 }
416 return cp;
417 }
419 // Scan the directory and append any jar or zip files found to path.
420 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
421 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
422 DIR* dir = os::opendir(directory);
423 if (dir == NULL) return path;
425 char dir_sep[2] = { '\0', '\0' };
426 size_t directory_len = strlen(directory);
427 const char fileSep = *os::file_separator();
428 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
430 /* Scan the directory for jars/zips, appending them to path. */
431 struct dirent *entry;
432 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
433 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
434 const char* name = entry->d_name;
435 const char* ext = name + strlen(name) - 4;
436 bool isJarOrZip = ext > name &&
437 (os::file_name_strcmp(ext, ".jar") == 0 ||
438 os::file_name_strcmp(ext, ".zip") == 0);
439 if (isJarOrZip) {
440 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
441 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
442 path = add_to_path(path, jarpath, false);
443 FREE_C_HEAP_ARRAY(char, jarpath);
444 }
445 }
446 FREE_C_HEAP_ARRAY(char, dbuf);
447 os::closedir(dir);
448 return path;
449 }
451 // Parses a memory size specification string.
452 static bool atomull(const char *s, julong* result) {
453 julong n = 0;
454 int args_read = sscanf(s, os::julong_format_specifier(), &n);
455 if (args_read != 1) {
456 return false;
457 }
458 while (*s != '\0' && isdigit(*s)) {
459 s++;
460 }
461 // 4705540: illegal if more characters are found after the first non-digit
462 if (strlen(s) > 1) {
463 return false;
464 }
465 switch (*s) {
466 case 'T': case 't':
467 *result = n * G * K;
468 // Check for overflow.
469 if (*result/((julong)G * K) != n) return false;
470 return true;
471 case 'G': case 'g':
472 *result = n * G;
473 if (*result/G != n) return false;
474 return true;
475 case 'M': case 'm':
476 *result = n * M;
477 if (*result/M != n) return false;
478 return true;
479 case 'K': case 'k':
480 *result = n * K;
481 if (*result/K != n) return false;
482 return true;
483 case '\0':
484 *result = n;
485 return true;
486 default:
487 return false;
488 }
489 }
491 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
492 if (size < min_size) return arg_too_small;
493 // Check that size will fit in a size_t (only relevant on 32-bit)
494 if (size > max_uintx) return arg_too_big;
495 return arg_in_range;
496 }
498 // Describe an argument out of range error
499 void Arguments::describe_range_error(ArgsRange errcode) {
500 switch(errcode) {
501 case arg_too_big:
502 jio_fprintf(defaultStream::error_stream(),
503 "The specified size exceeds the maximum "
504 "representable size.\n");
505 break;
506 case arg_too_small:
507 case arg_unreadable:
508 case arg_in_range:
509 // do nothing for now
510 break;
511 default:
512 ShouldNotReachHere();
513 }
514 }
516 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
517 return CommandLineFlags::boolAtPut(name, &value, origin);
518 }
520 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
521 double v;
522 if (sscanf(value, "%lf", &v) != 1) {
523 return false;
524 }
526 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
527 return true;
528 }
529 return false;
530 }
532 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
533 julong v;
534 intx intx_v;
535 bool is_neg = false;
536 // Check the sign first since atomull() parses only unsigned values.
537 if (*value == '-') {
538 if (!CommandLineFlags::intxAt(name, &intx_v)) {
539 return false;
540 }
541 value++;
542 is_neg = true;
543 }
544 if (!atomull(value, &v)) {
545 return false;
546 }
547 intx_v = (intx) v;
548 if (is_neg) {
549 intx_v = -intx_v;
550 }
551 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
552 return true;
553 }
554 uintx uintx_v = (uintx) v;
555 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
556 return true;
557 }
558 return false;
559 }
561 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
562 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
563 // Contract: CommandLineFlags always returns a pointer that needs freeing.
564 FREE_C_HEAP_ARRAY(char, value);
565 return true;
566 }
568 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
569 const char* old_value = "";
570 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
571 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
572 size_t new_len = strlen(new_value);
573 const char* value;
574 char* free_this_too = NULL;
575 if (old_len == 0) {
576 value = new_value;
577 } else if (new_len == 0) {
578 value = old_value;
579 } else {
580 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
581 // each new setting adds another LINE to the switch:
582 sprintf(buf, "%s\n%s", old_value, new_value);
583 value = buf;
584 free_this_too = buf;
585 }
586 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
587 // CommandLineFlags always returns a pointer that needs freeing.
588 FREE_C_HEAP_ARRAY(char, value);
589 if (free_this_too != NULL) {
590 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
591 FREE_C_HEAP_ARRAY(char, free_this_too);
592 }
593 return true;
594 }
596 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
598 // range of acceptable characters spelled out for portability reasons
599 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
600 #define BUFLEN 255
601 char name[BUFLEN+1];
602 char dummy;
604 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
605 return set_bool_flag(name, false, origin);
606 }
607 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
608 return set_bool_flag(name, true, origin);
609 }
611 char punct;
612 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
613 const char* value = strchr(arg, '=') + 1;
614 Flag* flag = Flag::find_flag(name, strlen(name));
615 if (flag != NULL && flag->is_ccstr()) {
616 if (flag->ccstr_accumulates()) {
617 return append_to_string_flag(name, value, origin);
618 } else {
619 if (value[0] == '\0') {
620 value = NULL;
621 }
622 return set_string_flag(name, value, origin);
623 }
624 }
625 }
627 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
628 const char* value = strchr(arg, '=') + 1;
629 // -XX:Foo:=xxx will reset the string flag to the given value.
630 if (value[0] == '\0') {
631 value = NULL;
632 }
633 return set_string_flag(name, value, origin);
634 }
636 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
637 #define SIGNED_NUMBER_RANGE "[-0123456789]"
638 #define NUMBER_RANGE "[0123456789]"
639 char value[BUFLEN + 1];
640 char value2[BUFLEN + 1];
641 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
642 // Looks like a floating-point number -- try again with more lenient format string
643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
644 return set_fp_numeric_flag(name, value, origin);
645 }
646 }
648 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
650 return set_numeric_flag(name, value, origin);
651 }
653 return false;
654 }
656 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
657 assert(bldarray != NULL, "illegal argument");
659 if (arg == NULL) {
660 return;
661 }
663 int index = *count;
665 // expand the array and add arg to the last element
666 (*count)++;
667 if (*bldarray == NULL) {
668 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
669 } else {
670 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
671 }
672 (*bldarray)[index] = strdup(arg);
673 }
675 void Arguments::build_jvm_args(const char* arg) {
676 add_string(&_jvm_args_array, &_num_jvm_args, arg);
677 }
679 void Arguments::build_jvm_flags(const char* arg) {
680 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
681 }
683 // utility function to return a string that concatenates all
684 // strings in a given char** array
685 const char* Arguments::build_resource_string(char** args, int count) {
686 if (args == NULL || count == 0) {
687 return NULL;
688 }
689 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
690 for (int i = 1; i < count; i++) {
691 length += strlen(args[i]) + 1; // add 1 for a space
692 }
693 char* s = NEW_RESOURCE_ARRAY(char, length);
694 strcpy(s, args[0]);
695 for (int j = 1; j < count; j++) {
696 strcat(s, " ");
697 strcat(s, args[j]);
698 }
699 return (const char*) s;
700 }
702 void Arguments::print_on(outputStream* st) {
703 st->print_cr("VM Arguments:");
704 if (num_jvm_flags() > 0) {
705 st->print("jvm_flags: "); print_jvm_flags_on(st);
706 }
707 if (num_jvm_args() > 0) {
708 st->print("jvm_args: "); print_jvm_args_on(st);
709 }
710 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
711 st->print_cr("Launcher Type: %s", _sun_java_launcher);
712 }
714 void Arguments::print_jvm_flags_on(outputStream* st) {
715 if (_num_jvm_flags > 0) {
716 for (int i=0; i < _num_jvm_flags; i++) {
717 st->print("%s ", _jvm_flags_array[i]);
718 }
719 st->print_cr("");
720 }
721 }
723 void Arguments::print_jvm_args_on(outputStream* st) {
724 if (_num_jvm_args > 0) {
725 for (int i=0; i < _num_jvm_args; i++) {
726 st->print("%s ", _jvm_args_array[i]);
727 }
728 st->print_cr("");
729 }
730 }
732 bool Arguments::process_argument(const char* arg,
733 jboolean ignore_unrecognized, FlagValueOrigin origin) {
735 JDK_Version since = JDK_Version();
737 if (parse_argument(arg, origin)) {
738 // do nothing
739 } else if (is_newly_obsolete(arg, &since)) {
740 enum { bufsize = 256 };
741 char buffer[bufsize];
742 since.to_string(buffer, bufsize);
743 jio_fprintf(defaultStream::error_stream(),
744 "Warning: The flag %s has been EOL'd as of %s and will"
745 " be ignored\n", arg, buffer);
746 } else {
747 if (!ignore_unrecognized) {
748 jio_fprintf(defaultStream::error_stream(),
749 "Unrecognized VM option '%s'\n", arg);
750 // allow for commandline "commenting out" options like -XX:#+Verbose
751 if (strlen(arg) == 0 || arg[0] != '#') {
752 return false;
753 }
754 }
755 }
756 return true;
757 }
759 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
760 FILE* stream = fopen(file_name, "rb");
761 if (stream == NULL) {
762 if (should_exist) {
763 jio_fprintf(defaultStream::error_stream(),
764 "Could not open settings file %s\n", file_name);
765 return false;
766 } else {
767 return true;
768 }
769 }
771 char token[1024];
772 int pos = 0;
774 bool in_white_space = true;
775 bool in_comment = false;
776 bool in_quote = false;
777 char quote_c = 0;
778 bool result = true;
780 int c = getc(stream);
781 while(c != EOF) {
782 if (in_white_space) {
783 if (in_comment) {
784 if (c == '\n') in_comment = false;
785 } else {
786 if (c == '#') in_comment = true;
787 else if (!isspace(c)) {
788 in_white_space = false;
789 token[pos++] = c;
790 }
791 }
792 } else {
793 if (c == '\n' || (!in_quote && isspace(c))) {
794 // token ends at newline, or at unquoted whitespace
795 // this allows a way to include spaces in string-valued options
796 token[pos] = '\0';
797 logOption(token);
798 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
799 build_jvm_flags(token);
800 pos = 0;
801 in_white_space = true;
802 in_quote = false;
803 } else if (!in_quote && (c == '\'' || c == '"')) {
804 in_quote = true;
805 quote_c = c;
806 } else if (in_quote && (c == quote_c)) {
807 in_quote = false;
808 } else {
809 token[pos++] = c;
810 }
811 }
812 c = getc(stream);
813 }
814 if (pos > 0) {
815 token[pos] = '\0';
816 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
817 build_jvm_flags(token);
818 }
819 fclose(stream);
820 return result;
821 }
823 //=============================================================================================================
824 // Parsing of properties (-D)
826 const char* Arguments::get_property(const char* key) {
827 return PropertyList_get_value(system_properties(), key);
828 }
830 bool Arguments::add_property(const char* prop) {
831 const char* eq = strchr(prop, '=');
832 char* key;
833 // ns must be static--its address may be stored in a SystemProperty object.
834 const static char ns[1] = {0};
835 char* value = (char *)ns;
837 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
838 key = AllocateHeap(key_len + 1, "add_property");
839 strncpy(key, prop, key_len);
840 key[key_len] = '\0';
842 if (eq != NULL) {
843 size_t value_len = strlen(prop) - key_len - 1;
844 value = AllocateHeap(value_len + 1, "add_property");
845 strncpy(value, &prop[key_len + 1], value_len + 1);
846 }
848 if (strcmp(key, "java.compiler") == 0) {
849 process_java_compiler_argument(value);
850 FreeHeap(key);
851 if (eq != NULL) {
852 FreeHeap(value);
853 }
854 return true;
855 }
856 else if (strcmp(key, "sun.java.command") == 0) {
858 _java_command = value;
860 // don't add this property to the properties exposed to the java application
861 FreeHeap(key);
862 return true;
863 }
864 else if (strcmp(key, "sun.java.launcher.pid") == 0) {
865 // launcher.pid property is private and is processed
866 // in process_sun_java_launcher_properties();
867 // the sun.java.launcher property is passed on to the java application
868 FreeHeap(key);
869 if (eq != NULL) {
870 FreeHeap(value);
871 }
872 return true;
873 }
874 else if (strcmp(key, "java.vendor.url.bug") == 0) {
875 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
876 // its value without going through the property list or making a Java call.
877 _java_vendor_url_bug = value;
878 }
880 // Create new property and add at the end of the list
881 PropertyList_unique_add(&_system_properties, key, value);
882 return true;
883 }
885 //===========================================================================================================
886 // Setting int/mixed/comp mode flags
888 void Arguments::set_mode_flags(Mode mode) {
889 // Set up default values for all flags.
890 // If you add a flag to any of the branches below,
891 // add a default value for it here.
892 set_java_compiler(false);
893 _mode = mode;
895 // Ensure Agent_OnLoad has the correct initial values.
896 // This may not be the final mode; mode may change later in onload phase.
897 PropertyList_unique_add(&_system_properties, "java.vm.info",
898 (char*)Abstract_VM_Version::vm_info_string());
900 UseInterpreter = true;
901 UseCompiler = true;
902 UseLoopCounter = true;
904 // Default values may be platform/compiler dependent -
905 // use the saved values
906 ClipInlining = Arguments::_ClipInlining;
907 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
908 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
909 BackgroundCompilation = Arguments::_BackgroundCompilation;
910 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
912 // Change from defaults based on mode
913 switch (mode) {
914 default:
915 ShouldNotReachHere();
916 break;
917 case _int:
918 UseCompiler = false;
919 UseLoopCounter = false;
920 AlwaysCompileLoopMethods = false;
921 UseOnStackReplacement = false;
922 break;
923 case _mixed:
924 // same as default
925 break;
926 case _comp:
927 UseInterpreter = false;
928 BackgroundCompilation = false;
929 ClipInlining = false;
930 break;
931 }
932 }
934 // Conflict: required to use shared spaces (-Xshare:on), but
935 // incompatible command line options were chosen.
937 static void no_shared_spaces() {
938 if (RequireSharedSpaces) {
939 jio_fprintf(defaultStream::error_stream(),
940 "Class data sharing is inconsistent with other specified options.\n");
941 vm_exit_during_initialization("Unable to use shared archive.", NULL);
942 } else {
943 FLAG_SET_DEFAULT(UseSharedSpaces, false);
944 }
945 }
947 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
948 // if it's not explictly set or unset. If the user has chosen
949 // UseParNewGC and not explicitly set ParallelGCThreads we
950 // set it, unless this is a single cpu machine.
951 void Arguments::set_parnew_gc_flags() {
952 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
953 "control point invariant");
954 assert(UseParNewGC, "Error");
956 // Turn off AdaptiveSizePolicy by default for parnew until it is
957 // complete.
958 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
959 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
960 }
962 if (ParallelGCThreads == 0) {
963 FLAG_SET_DEFAULT(ParallelGCThreads,
964 Abstract_VM_Version::parallel_worker_threads());
965 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
966 FLAG_SET_DEFAULT(UseParNewGC, false);
967 }
968 }
969 if (!UseParNewGC) {
970 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
971 } else {
972 no_shared_spaces();
974 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
975 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
976 // we set them to 1024 and 1024.
977 // See CR 6362902.
978 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
979 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
980 }
981 if (FLAG_IS_DEFAULT(OldPLABSize)) {
982 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
983 }
985 // AlwaysTenure flag should make ParNew to promote all at first collection.
986 // See CR 6362902.
987 if (AlwaysTenure) {
988 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
989 }
990 }
991 }
993 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
994 // sparc/solaris for certain applications, but would gain from
995 // further optimization and tuning efforts, and would almost
996 // certainly gain from analysis of platform and environment.
997 void Arguments::set_cms_and_parnew_gc_flags() {
998 assert(!UseSerialGC && !UseParallelGC, "Error");
999 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1001 // If we are using CMS, we prefer to UseParNewGC,
1002 // unless explicitly forbidden.
1003 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1004 FLAG_SET_ERGO(bool, UseParNewGC, true);
1005 }
1007 // Turn off AdaptiveSizePolicy by default for cms until it is
1008 // complete.
1009 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1010 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1011 }
1013 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1014 // as needed.
1015 if (UseParNewGC) {
1016 set_parnew_gc_flags();
1017 }
1019 // Now make adjustments for CMS
1020 size_t young_gen_per_worker;
1021 intx new_ratio;
1022 size_t min_new_default;
1023 intx tenuring_default;
1024 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1025 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1026 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1027 }
1028 young_gen_per_worker = 4*M;
1029 new_ratio = (intx)15;
1030 min_new_default = 4*M;
1031 tenuring_default = (intx)0;
1032 } else { // new defaults: "new" as of 6.0
1033 young_gen_per_worker = CMSYoungGenPerWorker;
1034 new_ratio = (intx)7;
1035 min_new_default = 16*M;
1036 tenuring_default = (intx)4;
1037 }
1039 // Preferred young gen size for "short" pauses
1040 const uintx parallel_gc_threads =
1041 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1042 const size_t preferred_max_new_size_unaligned =
1043 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1044 const size_t preferred_max_new_size =
1045 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1047 // Unless explicitly requested otherwise, size young gen
1048 // for "short" pauses ~ 4M*ParallelGCThreads
1049 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1050 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1051 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1052 } else {
1053 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1054 }
1055 if(PrintGCDetails && Verbose) {
1056 // Too early to use gclog_or_tty
1057 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1058 }
1059 }
1060 // Unless explicitly requested otherwise, prefer a large
1061 // Old to Young gen size so as to shift the collection load
1062 // to the old generation concurrent collector
1063 if (FLAG_IS_DEFAULT(NewRatio)) {
1064 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1066 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1067 size_t prev_initial_size = initial_heap_size();
1068 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1069 set_initial_heap_size(min_new+OldSize);
1070 // Currently minimum size and the initial heap sizes are the same.
1071 set_min_heap_size(initial_heap_size());
1072 if (PrintGCDetails && Verbose) {
1073 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1074 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1075 initial_heap_size()/M, prev_initial_size/M);
1076 }
1077 }
1078 // MaxHeapSize is aligned down in collectorPolicy
1079 size_t max_heap = align_size_down(MaxHeapSize,
1080 CardTableRS::ct_max_alignment_constraint());
1082 if(PrintGCDetails && Verbose) {
1083 // Too early to use gclog_or_tty
1084 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1085 " initial_heap_size: " SIZE_FORMAT
1086 " max_heap: " SIZE_FORMAT,
1087 min_heap_size(), initial_heap_size(), max_heap);
1088 }
1089 if (max_heap > min_new) {
1090 // Unless explicitly requested otherwise, make young gen
1091 // at least min_new, and at most preferred_max_new_size.
1092 if (FLAG_IS_DEFAULT(NewSize)) {
1093 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1094 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1095 if(PrintGCDetails && Verbose) {
1096 // Too early to use gclog_or_tty
1097 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1098 }
1099 }
1100 // Unless explicitly requested otherwise, size old gen
1101 // so that it's at least 3X of NewSize to begin with;
1102 // later NewRatio will decide how it grows; see above.
1103 if (FLAG_IS_DEFAULT(OldSize)) {
1104 if (max_heap > NewSize) {
1105 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1106 if(PrintGCDetails && Verbose) {
1107 // Too early to use gclog_or_tty
1108 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1109 }
1110 }
1111 }
1112 }
1113 }
1114 // Unless explicitly requested otherwise, definitely
1115 // promote all objects surviving "tenuring_default" scavenges.
1116 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1117 FLAG_IS_DEFAULT(SurvivorRatio)) {
1118 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1119 }
1120 // If we decided above (or user explicitly requested)
1121 // `promote all' (via MaxTenuringThreshold := 0),
1122 // prefer minuscule survivor spaces so as not to waste
1123 // space for (non-existent) survivors
1124 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1125 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1126 }
1127 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1128 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1129 // This is done in order to make ParNew+CMS configuration to work
1130 // with YoungPLABSize and OldPLABSize options.
1131 // See CR 6362902.
1132 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1133 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1134 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1135 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1136 // the value (either from the command line or ergonomics) of
1137 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1138 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1139 }
1140 else {
1141 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1142 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1143 // we'll let it to take precedence.
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1146 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1147 }
1148 }
1149 }
1151 inline uintx max_heap_for_compressed_oops() {
1152 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1153 NOT_LP64(return DefaultMaxRAM);
1154 }
1156 bool Arguments::should_auto_select_low_pause_collector() {
1157 if (UseAutoGCSelectPolicy &&
1158 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1159 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1160 if (PrintGCDetails) {
1161 // Cannot use gclog_or_tty yet.
1162 tty->print_cr("Automatic selection of the low pause collector"
1163 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1164 }
1165 return true;
1166 }
1167 return false;
1168 }
1170 void Arguments::set_ergonomics_flags() {
1171 // Parallel GC is not compatible with sharing. If one specifies
1172 // that they want sharing explicitly, do not set ergonmics flags.
1173 if (DumpSharedSpaces || ForceSharedSpaces) {
1174 return;
1175 }
1177 if (os::is_server_class_machine() && !force_client_mode ) {
1178 // If no other collector is requested explicitly,
1179 // let the VM select the collector based on
1180 // machine class and automatic selection policy.
1181 if (!UseSerialGC &&
1182 !UseConcMarkSweepGC &&
1183 !UseG1GC &&
1184 !UseParNewGC &&
1185 !DumpSharedSpaces &&
1186 FLAG_IS_DEFAULT(UseParallelGC)) {
1187 if (should_auto_select_low_pause_collector()) {
1188 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1189 } else {
1190 FLAG_SET_ERGO(bool, UseParallelGC, true);
1191 }
1192 no_shared_spaces();
1193 }
1194 }
1196 #ifdef _LP64
1197 // Compressed Headers do not work with CMS, which uses a bit in the klass
1198 // field offset to determine free list chunk markers.
1199 // Check that UseCompressedOops can be set with the max heap size allocated
1200 // by ergonomics.
1201 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1202 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1203 // Turn off until bug is fixed.
1204 // the following line to return it to default status.
1205 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1206 } else if (UseCompressedOops && UseG1GC) {
1207 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
1208 FLAG_SET_DEFAULT(UseCompressedOops, false);
1209 }
1210 #ifdef _WIN64
1211 if (UseLargePages && UseCompressedOops) {
1212 // Cannot allocate guard pages for implicit checks in indexed addressing
1213 // mode, when large pages are specified on windows.
1214 // This flag could be switched ON if narrow oop base address is set to 0,
1215 // see code in Universe::initialize_heap().
1216 Universe::set_narrow_oop_use_implicit_null_checks(false);
1217 }
1218 #endif // _WIN64
1219 } else {
1220 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1221 warning("Max heap size too large for Compressed Oops");
1222 FLAG_SET_DEFAULT(UseCompressedOops, false);
1223 }
1224 }
1225 // Also checks that certain machines are slower with compressed oops
1226 // in vm_version initialization code.
1227 #endif // _LP64
1228 }
1230 void Arguments::set_parallel_gc_flags() {
1231 assert(UseParallelGC || UseParallelOldGC, "Error");
1232 // If parallel old was requested, automatically enable parallel scavenge.
1233 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1234 FLAG_SET_DEFAULT(UseParallelGC, true);
1235 }
1237 // If no heap maximum was requested explicitly, use some reasonable fraction
1238 // of the physical memory, up to a maximum of 1GB.
1239 if (UseParallelGC) {
1240 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1241 Abstract_VM_Version::parallel_worker_threads());
1243 // PS is a server collector, setup the heap sizes accordingly.
1244 set_server_heap_size();
1245 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1246 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1247 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1248 // See CR 6362902 for details.
1249 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1250 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1251 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1252 }
1253 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1254 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1255 }
1256 }
1258 if (UseParallelOldGC) {
1259 // Par compact uses lower default values since they are treated as
1260 // minimums. These are different defaults because of the different
1261 // interpretation and are not ergonomically set.
1262 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1263 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1264 }
1265 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1266 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1267 }
1268 }
1269 }
1270 }
1272 void Arguments::set_g1_gc_flags() {
1273 assert(UseG1GC, "Error");
1274 // G1 is a server collector, setup the heap sizes accordingly.
1275 set_server_heap_size();
1276 #ifdef COMPILER1
1277 FastTLABRefill = false;
1278 #endif
1279 FLAG_SET_DEFAULT(ParallelGCThreads,
1280 Abstract_VM_Version::parallel_worker_threads());
1281 if (ParallelGCThreads == 0) {
1282 FLAG_SET_DEFAULT(ParallelGCThreads,
1283 Abstract_VM_Version::parallel_worker_threads
1284 ());
1285 }
1286 no_shared_spaces();
1287 }
1289 void Arguments::set_server_heap_size() {
1290 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1291 const uint64_t reasonable_fraction =
1292 os::physical_memory() / DefaultMaxRAMFraction;
1293 const uint64_t maximum_size = (uint64_t)
1294 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1295 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1296 DefaultMaxRAM);
1297 size_t reasonable_max =
1298 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1299 if (reasonable_max > maximum_size) {
1300 reasonable_max = maximum_size;
1301 }
1302 if (PrintGCDetails && Verbose) {
1303 // Cannot use gclog_or_tty yet.
1304 tty->print_cr(" Max heap size for server class platform "
1305 SIZE_FORMAT, reasonable_max);
1306 }
1307 // If the initial_heap_size has not been set with -Xms,
1308 // then set it as fraction of size of physical memory
1309 // respecting the maximum and minimum sizes of the heap.
1310 if (initial_heap_size() == 0) {
1311 const uint64_t reasonable_initial_fraction =
1312 os::physical_memory() / DefaultInitialRAMFraction;
1313 const size_t reasonable_initial =
1314 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1315 const size_t minimum_size = NewSize + OldSize;
1316 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1317 minimum_size));
1318 // Currently the minimum size and the initial heap sizes are the same.
1319 set_min_heap_size(initial_heap_size());
1320 if (PrintGCDetails && Verbose) {
1321 // Cannot use gclog_or_tty yet.
1322 tty->print_cr(" Initial heap size for server class platform "
1323 SIZE_FORMAT, initial_heap_size());
1324 }
1325 } else {
1326 // A minimum size was specified on the command line. Be sure
1327 // that the maximum size is consistent.
1328 if (initial_heap_size() > reasonable_max) {
1329 reasonable_max = initial_heap_size();
1330 }
1331 }
1332 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1333 }
1334 }
1336 // This must be called after ergonomics because we want bytecode rewriting
1337 // if the server compiler is used, or if UseSharedSpaces is disabled.
1338 void Arguments::set_bytecode_flags() {
1339 // Better not attempt to store into a read-only space.
1340 if (UseSharedSpaces) {
1341 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1342 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1343 }
1345 if (!RewriteBytecodes) {
1346 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1347 }
1348 }
1350 // Aggressive optimization flags -XX:+AggressiveOpts
1351 void Arguments::set_aggressive_opts_flags() {
1352 #ifdef COMPILER2
1353 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1354 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1355 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1356 }
1357 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1358 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1359 }
1361 // Feed the cache size setting into the JDK
1362 char buffer[1024];
1363 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1364 add_property(buffer);
1365 }
1366 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1367 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1368 }
1369 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) {
1370 FLAG_SET_DEFAULT(SpecialArraysEquals, true);
1371 }
1372 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1373 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1374 }
1375 #endif
1377 if (AggressiveOpts) {
1378 // Sample flag setting code
1379 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1380 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1381 // }
1382 }
1383 }
1385 //===========================================================================================================
1386 // Parsing of java.compiler property
1388 void Arguments::process_java_compiler_argument(char* arg) {
1389 // For backwards compatibility, Djava.compiler=NONE or ""
1390 // causes us to switch to -Xint mode UNLESS -Xdebug
1391 // is also specified.
1392 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1393 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1394 }
1395 }
1397 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1398 _sun_java_launcher = strdup(launcher);
1399 }
1401 bool Arguments::created_by_java_launcher() {
1402 assert(_sun_java_launcher != NULL, "property must have value");
1403 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1404 }
1406 //===========================================================================================================
1407 // Parsing of main arguments
1409 bool Arguments::verify_percentage(uintx value, const char* name) {
1410 if (value <= 100) {
1411 return true;
1412 }
1413 jio_fprintf(defaultStream::error_stream(),
1414 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1415 name, value);
1416 return false;
1417 }
1419 static void set_serial_gc_flags() {
1420 FLAG_SET_DEFAULT(UseSerialGC, true);
1421 FLAG_SET_DEFAULT(UseParNewGC, false);
1422 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1423 FLAG_SET_DEFAULT(UseParallelGC, false);
1424 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1425 FLAG_SET_DEFAULT(UseG1GC, false);
1426 }
1428 static bool verify_serial_gc_flags() {
1429 return (UseSerialGC &&
1430 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC ||
1431 UseParallelGC || UseParallelOldGC));
1432 }
1434 // Check consistency of GC selection
1435 bool Arguments::check_gc_consistency() {
1436 bool status = true;
1437 // Ensure that the user has not selected conflicting sets
1438 // of collectors. [Note: this check is merely a user convenience;
1439 // collectors over-ride each other so that only a non-conflicting
1440 // set is selected; however what the user gets is not what they
1441 // may have expected from the combination they asked for. It's
1442 // better to reduce user confusion by not allowing them to
1443 // select conflicting combinations.
1444 uint i = 0;
1445 if (UseSerialGC) i++;
1446 if (UseConcMarkSweepGC || UseParNewGC) i++;
1447 if (UseParallelGC || UseParallelOldGC) i++;
1448 if (i > 1) {
1449 jio_fprintf(defaultStream::error_stream(),
1450 "Conflicting collector combinations in option list; "
1451 "please refer to the release notes for the combinations "
1452 "allowed\n");
1453 status = false;
1454 }
1456 return status;
1457 }
1459 // Check the consistency of vm_init_args
1460 bool Arguments::check_vm_args_consistency() {
1461 // Method for adding checks for flag consistency.
1462 // The intent is to warn the user of all possible conflicts,
1463 // before returning an error.
1464 // Note: Needs platform-dependent factoring.
1465 bool status = true;
1467 #if ( (defined(COMPILER2) && defined(SPARC)))
1468 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1469 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1470 // x86. Normally, VM_Version_init must be called from init_globals in
1471 // init.cpp, which is called by the initial java thread *after* arguments
1472 // have been parsed. VM_Version_init gets called twice on sparc.
1473 extern void VM_Version_init();
1474 VM_Version_init();
1475 if (!VM_Version::has_v9()) {
1476 jio_fprintf(defaultStream::error_stream(),
1477 "V8 Machine detected, Server requires V9\n");
1478 status = false;
1479 }
1480 #endif /* COMPILER2 && SPARC */
1482 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1483 // builds so the cost of stack banging can be measured.
1484 #if (defined(PRODUCT) && defined(SOLARIS))
1485 if (!UseBoundThreads && !UseStackBanging) {
1486 jio_fprintf(defaultStream::error_stream(),
1487 "-UseStackBanging conflicts with -UseBoundThreads\n");
1489 status = false;
1490 }
1491 #endif
1493 if (TLABRefillWasteFraction == 0) {
1494 jio_fprintf(defaultStream::error_stream(),
1495 "TLABRefillWasteFraction should be a denominator, "
1496 "not " SIZE_FORMAT "\n",
1497 TLABRefillWasteFraction);
1498 status = false;
1499 }
1501 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1502 "MaxLiveObjectEvacuationRatio");
1503 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1504 "AdaptiveSizePolicyWeight");
1505 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1506 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1507 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1508 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1510 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1511 jio_fprintf(defaultStream::error_stream(),
1512 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1513 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1514 MinHeapFreeRatio, MaxHeapFreeRatio);
1515 status = false;
1516 }
1517 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1518 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1520 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1521 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1522 }
1524 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1525 // Settings to encourage splitting.
1526 if (!FLAG_IS_CMDLINE(NewRatio)) {
1527 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1528 }
1529 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1530 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1531 }
1532 }
1534 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1535 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1536 if (GCTimeLimit == 100) {
1537 // Turn off gc-overhead-limit-exceeded checks
1538 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1539 }
1541 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1543 // Check user specified sharing option conflict with Parallel GC
1544 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC ||
1545 UseParallelGC || UseParallelOldGC ||
1546 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1548 if (cannot_share) {
1549 // Either force sharing on by forcing the other options off, or
1550 // force sharing off.
1551 if (DumpSharedSpaces || ForceSharedSpaces) {
1552 set_serial_gc_flags();
1553 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1554 } else {
1555 no_shared_spaces();
1556 }
1557 }
1559 status = status && check_gc_consistency();
1561 if (_has_alloc_profile) {
1562 if (UseParallelGC || UseParallelOldGC) {
1563 jio_fprintf(defaultStream::error_stream(),
1564 "error: invalid argument combination.\n"
1565 "Allocation profiling (-Xaprof) cannot be used together with "
1566 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1567 status = false;
1568 }
1569 if (UseConcMarkSweepGC) {
1570 jio_fprintf(defaultStream::error_stream(),
1571 "error: invalid argument combination.\n"
1572 "Allocation profiling (-Xaprof) cannot be used together with "
1573 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1574 status = false;
1575 }
1576 }
1578 if (CMSIncrementalMode) {
1579 if (!UseConcMarkSweepGC) {
1580 jio_fprintf(defaultStream::error_stream(),
1581 "error: invalid argument combination.\n"
1582 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1583 "selected in order\nto use CMSIncrementalMode.\n");
1584 status = false;
1585 } else {
1586 status = status && verify_percentage(CMSIncrementalDutyCycle,
1587 "CMSIncrementalDutyCycle");
1588 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1589 "CMSIncrementalDutyCycleMin");
1590 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1591 "CMSIncrementalSafetyFactor");
1592 status = status && verify_percentage(CMSIncrementalOffset,
1593 "CMSIncrementalOffset");
1594 status = status && verify_percentage(CMSExpAvgFactor,
1595 "CMSExpAvgFactor");
1596 // If it was not set on the command line, set
1597 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1598 if (CMSInitiatingOccupancyFraction < 0) {
1599 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1600 }
1601 }
1602 }
1604 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1605 // insists that we hold the requisite locks so that the iteration is
1606 // MT-safe. For the verification at start-up and shut-down, we don't
1607 // yet have a good way of acquiring and releasing these locks,
1608 // which are not visible at the CollectedHeap level. We want to
1609 // be able to acquire these locks and then do the iteration rather
1610 // than just disable the lock verification. This will be fixed under
1611 // bug 4788986.
1612 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1613 if (VerifyGCStartAt == 0) {
1614 warning("Heap verification at start-up disabled "
1615 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1616 VerifyGCStartAt = 1; // Disable verification at start-up
1617 }
1618 if (VerifyBeforeExit) {
1619 warning("Heap verification at shutdown disabled "
1620 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1621 VerifyBeforeExit = false; // Disable verification at shutdown
1622 }
1623 }
1625 // Note: only executed in non-PRODUCT mode
1626 if (!UseAsyncConcMarkSweepGC &&
1627 (ExplicitGCInvokesConcurrent ||
1628 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1629 jio_fprintf(defaultStream::error_stream(),
1630 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1631 " with -UseAsyncConcMarkSweepGC");
1632 status = false;
1633 }
1635 return status;
1636 }
1638 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1639 const char* option_type) {
1640 if (ignore) return false;
1642 const char* spacer = " ";
1643 if (option_type == NULL) {
1644 option_type = ++spacer; // Set both to the empty string.
1645 }
1647 if (os::obsolete_option(option)) {
1648 jio_fprintf(defaultStream::error_stream(),
1649 "Obsolete %s%soption: %s\n", option_type, spacer,
1650 option->optionString);
1651 return false;
1652 } else {
1653 jio_fprintf(defaultStream::error_stream(),
1654 "Unrecognized %s%soption: %s\n", option_type, spacer,
1655 option->optionString);
1656 return true;
1657 }
1658 }
1660 static const char* user_assertion_options[] = {
1661 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1662 };
1664 static const char* system_assertion_options[] = {
1665 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1666 };
1668 // Return true if any of the strings in null-terminated array 'names' matches.
1669 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1670 // the option must match exactly.
1671 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1672 bool tail_allowed) {
1673 for (/* empty */; *names != NULL; ++names) {
1674 if (match_option(option, *names, tail)) {
1675 if (**tail == '\0' || tail_allowed && **tail == ':') {
1676 return true;
1677 }
1678 }
1679 }
1680 return false;
1681 }
1683 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1684 julong* long_arg,
1685 julong min_size) {
1686 if (!atomull(s, long_arg)) return arg_unreadable;
1687 return check_memory_size(*long_arg, min_size);
1688 }
1690 // Parse JavaVMInitArgs structure
1692 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1693 // For components of the system classpath.
1694 SysClassPath scp(Arguments::get_sysclasspath());
1695 bool scp_assembly_required = false;
1697 // Save default settings for some mode flags
1698 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1699 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1700 Arguments::_ClipInlining = ClipInlining;
1701 Arguments::_BackgroundCompilation = BackgroundCompilation;
1702 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1704 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1705 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1706 if (result != JNI_OK) {
1707 return result;
1708 }
1710 // Parse JavaVMInitArgs structure passed in
1711 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1712 if (result != JNI_OK) {
1713 return result;
1714 }
1716 if (AggressiveOpts) {
1717 // Insert alt-rt.jar between user-specified bootclasspath
1718 // prefix and the default bootclasspath. os::set_boot_path()
1719 // uses meta_index_dir as the default bootclasspath directory.
1720 const char* altclasses_jar = "alt-rt.jar";
1721 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1722 strlen(altclasses_jar);
1723 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1724 strcpy(altclasses_path, get_meta_index_dir());
1725 strcat(altclasses_path, altclasses_jar);
1726 scp.add_suffix_to_prefix(altclasses_path);
1727 scp_assembly_required = true;
1728 FREE_C_HEAP_ARRAY(char, altclasses_path);
1729 }
1731 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1732 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1733 if (result != JNI_OK) {
1734 return result;
1735 }
1737 // Do final processing now that all arguments have been parsed
1738 result = finalize_vm_init_args(&scp, scp_assembly_required);
1739 if (result != JNI_OK) {
1740 return result;
1741 }
1743 return JNI_OK;
1744 }
1746 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1747 SysClassPath* scp_p,
1748 bool* scp_assembly_required_p,
1749 FlagValueOrigin origin) {
1750 // Remaining part of option string
1751 const char* tail;
1753 // iterate over arguments
1754 for (int index = 0; index < args->nOptions; index++) {
1755 bool is_absolute_path = false; // for -agentpath vs -agentlib
1757 const JavaVMOption* option = args->options + index;
1759 if (!match_option(option, "-Djava.class.path", &tail) &&
1760 !match_option(option, "-Dsun.java.command", &tail) &&
1761 !match_option(option, "-Dsun.java.launcher", &tail)) {
1763 // add all jvm options to the jvm_args string. This string
1764 // is used later to set the java.vm.args PerfData string constant.
1765 // the -Djava.class.path and the -Dsun.java.command options are
1766 // omitted from jvm_args string as each have their own PerfData
1767 // string constant object.
1768 build_jvm_args(option->optionString);
1769 }
1771 // -verbose:[class/gc/jni]
1772 if (match_option(option, "-verbose", &tail)) {
1773 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1774 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1775 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1776 } else if (!strcmp(tail, ":gc")) {
1777 FLAG_SET_CMDLINE(bool, PrintGC, true);
1778 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1779 } else if (!strcmp(tail, ":jni")) {
1780 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1781 }
1782 // -da / -ea / -disableassertions / -enableassertions
1783 // These accept an optional class/package name separated by a colon, e.g.,
1784 // -da:java.lang.Thread.
1785 } else if (match_option(option, user_assertion_options, &tail, true)) {
1786 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1787 if (*tail == '\0') {
1788 JavaAssertions::setUserClassDefault(enable);
1789 } else {
1790 assert(*tail == ':', "bogus match by match_option()");
1791 JavaAssertions::addOption(tail + 1, enable);
1792 }
1793 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1794 } else if (match_option(option, system_assertion_options, &tail, false)) {
1795 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1796 JavaAssertions::setSystemClassDefault(enable);
1797 // -bootclasspath:
1798 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1799 scp_p->reset_path(tail);
1800 *scp_assembly_required_p = true;
1801 // -bootclasspath/a:
1802 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1803 scp_p->add_suffix(tail);
1804 *scp_assembly_required_p = true;
1805 // -bootclasspath/p:
1806 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1807 scp_p->add_prefix(tail);
1808 *scp_assembly_required_p = true;
1809 // -Xrun
1810 } else if (match_option(option, "-Xrun", &tail)) {
1811 if (tail != NULL) {
1812 const char* pos = strchr(tail, ':');
1813 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1814 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1815 name[len] = '\0';
1817 char *options = NULL;
1818 if(pos != NULL) {
1819 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1820 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1821 }
1822 #ifdef JVMTI_KERNEL
1823 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1824 warning("profiling and debugging agents are not supported with Kernel VM");
1825 } else
1826 #endif // JVMTI_KERNEL
1827 add_init_library(name, options);
1828 }
1829 // -agentlib and -agentpath
1830 } else if (match_option(option, "-agentlib:", &tail) ||
1831 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1832 if(tail != NULL) {
1833 const char* pos = strchr(tail, '=');
1834 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1835 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1836 name[len] = '\0';
1838 char *options = NULL;
1839 if(pos != NULL) {
1840 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1841 }
1842 #ifdef JVMTI_KERNEL
1843 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1844 warning("profiling and debugging agents are not supported with Kernel VM");
1845 } else
1846 #endif // JVMTI_KERNEL
1847 add_init_agent(name, options, is_absolute_path);
1849 }
1850 // -javaagent
1851 } else if (match_option(option, "-javaagent:", &tail)) {
1852 if(tail != NULL) {
1853 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1854 add_init_agent("instrument", options, false);
1855 }
1856 // -Xnoclassgc
1857 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1858 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1859 // -Xincgc: i-CMS
1860 } else if (match_option(option, "-Xincgc", &tail)) {
1861 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1862 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1863 // -Xnoincgc: no i-CMS
1864 } else if (match_option(option, "-Xnoincgc", &tail)) {
1865 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1866 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1867 // -Xconcgc
1868 } else if (match_option(option, "-Xconcgc", &tail)) {
1869 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1870 // -Xnoconcgc
1871 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1872 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1873 // -Xbatch
1874 } else if (match_option(option, "-Xbatch", &tail)) {
1875 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1876 // -Xmn for compatibility with other JVM vendors
1877 } else if (match_option(option, "-Xmn", &tail)) {
1878 julong long_initial_eden_size = 0;
1879 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1880 if (errcode != arg_in_range) {
1881 jio_fprintf(defaultStream::error_stream(),
1882 "Invalid initial eden size: %s\n", option->optionString);
1883 describe_range_error(errcode);
1884 return JNI_EINVAL;
1885 }
1886 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1887 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1888 // -Xms
1889 } else if (match_option(option, "-Xms", &tail)) {
1890 julong long_initial_heap_size = 0;
1891 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1892 if (errcode != arg_in_range) {
1893 jio_fprintf(defaultStream::error_stream(),
1894 "Invalid initial heap size: %s\n", option->optionString);
1895 describe_range_error(errcode);
1896 return JNI_EINVAL;
1897 }
1898 set_initial_heap_size((size_t) long_initial_heap_size);
1899 // Currently the minimum size and the initial heap sizes are the same.
1900 set_min_heap_size(initial_heap_size());
1901 // -Xmx
1902 } else if (match_option(option, "-Xmx", &tail)) {
1903 julong long_max_heap_size = 0;
1904 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1905 if (errcode != arg_in_range) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "Invalid maximum heap size: %s\n", option->optionString);
1908 describe_range_error(errcode);
1909 return JNI_EINVAL;
1910 }
1911 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1912 // Xmaxf
1913 } else if (match_option(option, "-Xmaxf", &tail)) {
1914 int maxf = (int)(atof(tail) * 100);
1915 if (maxf < 0 || maxf > 100) {
1916 jio_fprintf(defaultStream::error_stream(),
1917 "Bad max heap free percentage size: %s\n",
1918 option->optionString);
1919 return JNI_EINVAL;
1920 } else {
1921 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1922 }
1923 // Xminf
1924 } else if (match_option(option, "-Xminf", &tail)) {
1925 int minf = (int)(atof(tail) * 100);
1926 if (minf < 0 || minf > 100) {
1927 jio_fprintf(defaultStream::error_stream(),
1928 "Bad min heap free percentage size: %s\n",
1929 option->optionString);
1930 return JNI_EINVAL;
1931 } else {
1932 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1933 }
1934 // -Xss
1935 } else if (match_option(option, "-Xss", &tail)) {
1936 julong long_ThreadStackSize = 0;
1937 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1938 if (errcode != arg_in_range) {
1939 jio_fprintf(defaultStream::error_stream(),
1940 "Invalid thread stack size: %s\n", option->optionString);
1941 describe_range_error(errcode);
1942 return JNI_EINVAL;
1943 }
1944 // Internally track ThreadStackSize in units of 1024 bytes.
1945 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1946 round_to((int)long_ThreadStackSize, K) / K);
1947 // -Xoss
1948 } else if (match_option(option, "-Xoss", &tail)) {
1949 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1950 // -Xmaxjitcodesize
1951 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1952 julong long_ReservedCodeCacheSize = 0;
1953 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1954 (size_t)InitialCodeCacheSize);
1955 if (errcode != arg_in_range) {
1956 jio_fprintf(defaultStream::error_stream(),
1957 "Invalid maximum code cache size: %s\n",
1958 option->optionString);
1959 describe_range_error(errcode);
1960 return JNI_EINVAL;
1961 }
1962 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1963 // -green
1964 } else if (match_option(option, "-green", &tail)) {
1965 jio_fprintf(defaultStream::error_stream(),
1966 "Green threads support not available\n");
1967 return JNI_EINVAL;
1968 // -native
1969 } else if (match_option(option, "-native", &tail)) {
1970 // HotSpot always uses native threads, ignore silently for compatibility
1971 // -Xsqnopause
1972 } else if (match_option(option, "-Xsqnopause", &tail)) {
1973 // EVM option, ignore silently for compatibility
1974 // -Xrs
1975 } else if (match_option(option, "-Xrs", &tail)) {
1976 // Classic/EVM option, new functionality
1977 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1978 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1979 // change default internal VM signals used - lower case for back compat
1980 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1981 // -Xoptimize
1982 } else if (match_option(option, "-Xoptimize", &tail)) {
1983 // EVM option, ignore silently for compatibility
1984 // -Xprof
1985 } else if (match_option(option, "-Xprof", &tail)) {
1986 #ifndef FPROF_KERNEL
1987 _has_profile = true;
1988 #else // FPROF_KERNEL
1989 // do we have to exit?
1990 warning("Kernel VM does not support flat profiling.");
1991 #endif // FPROF_KERNEL
1992 // -Xaprof
1993 } else if (match_option(option, "-Xaprof", &tail)) {
1994 _has_alloc_profile = true;
1995 // -Xconcurrentio
1996 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1997 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1998 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1999 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2000 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2001 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2003 // -Xinternalversion
2004 } else if (match_option(option, "-Xinternalversion", &tail)) {
2005 jio_fprintf(defaultStream::output_stream(), "%s\n",
2006 VM_Version::internal_vm_info_string());
2007 vm_exit(0);
2008 #ifndef PRODUCT
2009 // -Xprintflags
2010 } else if (match_option(option, "-Xprintflags", &tail)) {
2011 CommandLineFlags::printFlags();
2012 vm_exit(0);
2013 #endif
2014 // -D
2015 } else if (match_option(option, "-D", &tail)) {
2016 if (!add_property(tail)) {
2017 return JNI_ENOMEM;
2018 }
2019 // Out of the box management support
2020 if (match_option(option, "-Dcom.sun.management", &tail)) {
2021 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2022 }
2023 // -Xint
2024 } else if (match_option(option, "-Xint", &tail)) {
2025 set_mode_flags(_int);
2026 // -Xmixed
2027 } else if (match_option(option, "-Xmixed", &tail)) {
2028 set_mode_flags(_mixed);
2029 // -Xcomp
2030 } else if (match_option(option, "-Xcomp", &tail)) {
2031 // for testing the compiler; turn off all flags that inhibit compilation
2032 set_mode_flags(_comp);
2034 // -Xshare:dump
2035 } else if (match_option(option, "-Xshare:dump", &tail)) {
2036 #ifdef TIERED
2037 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2038 set_mode_flags(_int); // Prevent compilation, which creates objects
2039 #elif defined(COMPILER2)
2040 vm_exit_during_initialization(
2041 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2042 #elif defined(KERNEL)
2043 vm_exit_during_initialization(
2044 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2045 #else
2046 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2047 set_mode_flags(_int); // Prevent compilation, which creates objects
2048 #endif
2049 // -Xshare:on
2050 } else if (match_option(option, "-Xshare:on", &tail)) {
2051 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2052 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2053 #ifdef TIERED
2054 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2055 #endif // TIERED
2056 // -Xshare:auto
2057 } else if (match_option(option, "-Xshare:auto", &tail)) {
2058 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2059 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2060 // -Xshare:off
2061 } else if (match_option(option, "-Xshare:off", &tail)) {
2062 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2063 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2065 // -Xverify
2066 } else if (match_option(option, "-Xverify", &tail)) {
2067 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2068 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2069 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2070 } else if (strcmp(tail, ":remote") == 0) {
2071 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2072 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2073 } else if (strcmp(tail, ":none") == 0) {
2074 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2075 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2076 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2077 return JNI_EINVAL;
2078 }
2079 // -Xdebug
2080 } else if (match_option(option, "-Xdebug", &tail)) {
2081 // note this flag has been used, then ignore
2082 set_xdebug_mode(true);
2083 // -Xnoagent
2084 } else if (match_option(option, "-Xnoagent", &tail)) {
2085 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2086 } else if (match_option(option, "-Xboundthreads", &tail)) {
2087 // Bind user level threads to kernel threads (Solaris only)
2088 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2089 } else if (match_option(option, "-Xloggc:", &tail)) {
2090 // Redirect GC output to the file. -Xloggc:<filename>
2091 // ostream_init_log(), when called will use this filename
2092 // to initialize a fileStream.
2093 _gc_log_filename = strdup(tail);
2094 FLAG_SET_CMDLINE(bool, PrintGC, true);
2095 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2096 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2098 // JNI hooks
2099 } else if (match_option(option, "-Xcheck", &tail)) {
2100 if (!strcmp(tail, ":jni")) {
2101 CheckJNICalls = true;
2102 } else if (is_bad_option(option, args->ignoreUnrecognized,
2103 "check")) {
2104 return JNI_EINVAL;
2105 }
2106 } else if (match_option(option, "vfprintf", &tail)) {
2107 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2108 } else if (match_option(option, "exit", &tail)) {
2109 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2110 } else if (match_option(option, "abort", &tail)) {
2111 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2112 // -XX:+AggressiveHeap
2113 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2115 // This option inspects the machine and attempts to set various
2116 // parameters to be optimal for long-running, memory allocation
2117 // intensive jobs. It is intended for machines with large
2118 // amounts of cpu and memory.
2120 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2121 // VM, but we may not be able to represent the total physical memory
2122 // available (like having 8gb of memory on a box but using a 32bit VM).
2123 // Thus, we need to make sure we're using a julong for intermediate
2124 // calculations.
2125 julong initHeapSize;
2126 julong total_memory = os::physical_memory();
2128 if (total_memory < (julong)256*M) {
2129 jio_fprintf(defaultStream::error_stream(),
2130 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2131 vm_exit(1);
2132 }
2134 // The heap size is half of available memory, or (at most)
2135 // all of possible memory less 160mb (leaving room for the OS
2136 // when using ISM). This is the maximum; because adaptive sizing
2137 // is turned on below, the actual space used may be smaller.
2139 initHeapSize = MIN2(total_memory / (julong)2,
2140 total_memory - (julong)160*M);
2142 // Make sure that if we have a lot of memory we cap the 32 bit
2143 // process space. The 64bit VM version of this function is a nop.
2144 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2146 // The perm gen is separate but contiguous with the
2147 // object heap (and is reserved with it) so subtract it
2148 // from the heap size.
2149 if (initHeapSize > MaxPermSize) {
2150 initHeapSize = initHeapSize - MaxPermSize;
2151 } else {
2152 warning("AggressiveHeap and MaxPermSize values may conflict");
2153 }
2155 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2156 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2157 set_initial_heap_size(MaxHeapSize);
2158 // Currently the minimum size and the initial heap sizes are the same.
2159 set_min_heap_size(initial_heap_size());
2160 }
2161 if (FLAG_IS_DEFAULT(NewSize)) {
2162 // Make the young generation 3/8ths of the total heap.
2163 FLAG_SET_CMDLINE(uintx, NewSize,
2164 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2165 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2166 }
2168 FLAG_SET_DEFAULT(UseLargePages, true);
2170 // Increase some data structure sizes for efficiency
2171 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2172 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2173 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2175 // See the OldPLABSize comment below, but replace 'after promotion'
2176 // with 'after copying'. YoungPLABSize is the size of the survivor
2177 // space per-gc-thread buffers. The default is 4kw.
2178 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2180 // OldPLABSize is the size of the buffers in the old gen that
2181 // UseParallelGC uses to promote live data that doesn't fit in the
2182 // survivor spaces. At any given time, there's one for each gc thread.
2183 // The default size is 1kw. These buffers are rarely used, since the
2184 // survivor spaces are usually big enough. For specjbb, however, there
2185 // are occasions when there's lots of live data in the young gen
2186 // and we end up promoting some of it. We don't have a definite
2187 // explanation for why bumping OldPLABSize helps, but the theory
2188 // is that a bigger PLAB results in retaining something like the
2189 // original allocation order after promotion, which improves mutator
2190 // locality. A minor effect may be that larger PLABs reduce the
2191 // number of PLAB allocation events during gc. The value of 8kw
2192 // was arrived at by experimenting with specjbb.
2193 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2195 // CompilationPolicyChoice=0 causes the server compiler to adopt
2196 // a more conservative which-method-do-I-compile policy when one
2197 // of the counters maintained by the interpreter trips. The
2198 // result is reduced startup time and improved specjbb and
2199 // alacrity performance. Zero is the default, but we set it
2200 // explicitly here in case the default changes.
2201 // See runtime/compilationPolicy.*.
2202 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2204 // Enable parallel GC and adaptive generation sizing
2205 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2206 FLAG_SET_DEFAULT(ParallelGCThreads,
2207 Abstract_VM_Version::parallel_worker_threads());
2209 // Encourage steady state memory management
2210 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2212 // This appears to improve mutator locality
2213 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2215 // Get around early Solaris scheduling bug
2216 // (affinity vs other jobs on system)
2217 // but disallow DR and offlining (5008695).
2218 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2220 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2221 // The last option must always win.
2222 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2223 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2224 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2225 // The last option must always win.
2226 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2227 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2228 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2229 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "Please use CMSClassUnloadingEnabled in place of "
2232 "CMSPermGenSweepingEnabled in the future\n");
2233 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2234 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2235 jio_fprintf(defaultStream::error_stream(),
2236 "Please use -XX:+UseGCOverheadLimit in place of "
2237 "-XX:+UseGCTimeLimit in the future\n");
2238 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2239 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2240 jio_fprintf(defaultStream::error_stream(),
2241 "Please use -XX:-UseGCOverheadLimit in place of "
2242 "-XX:-UseGCTimeLimit in the future\n");
2243 // The TLE options are for compatibility with 1.3 and will be
2244 // removed without notice in a future release. These options
2245 // are not to be documented.
2246 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2247 // No longer used.
2248 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2249 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2250 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2251 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2252 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2253 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2254 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2255 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2256 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2257 // No longer used.
2258 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2259 julong long_tlab_size = 0;
2260 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2261 if (errcode != arg_in_range) {
2262 jio_fprintf(defaultStream::error_stream(),
2263 "Invalid TLAB size: %s\n", option->optionString);
2264 describe_range_error(errcode);
2265 return JNI_EINVAL;
2266 }
2267 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2268 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2269 // No longer used.
2270 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2271 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2272 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2273 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2274 SOLARIS_ONLY(
2275 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2276 warning("-XX:+UsePermISM is obsolete.");
2277 FLAG_SET_CMDLINE(bool, UseISM, true);
2278 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2279 FLAG_SET_CMDLINE(bool, UseISM, false);
2280 )
2281 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2282 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2283 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2284 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2285 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2286 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2287 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2288 #ifdef SOLARIS
2289 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2290 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2291 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2292 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2293 #else // ndef SOLARIS
2294 jio_fprintf(defaultStream::error_stream(),
2295 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2296 return JNI_EINVAL;
2297 #endif // ndef SOLARIS
2298 } else
2299 #ifdef ASSERT
2300 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2301 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2302 // disable scavenge before parallel mark-compact
2303 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2304 } else
2305 #endif
2306 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2307 julong cms_blocks_to_claim = (julong)atol(tail);
2308 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2309 jio_fprintf(defaultStream::error_stream(),
2310 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2311 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2312 } else
2313 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2314 julong old_plab_size = 0;
2315 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2316 if (errcode != arg_in_range) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Invalid old PLAB size: %s\n", option->optionString);
2319 describe_range_error(errcode);
2320 return JNI_EINVAL;
2321 }
2322 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2323 jio_fprintf(defaultStream::error_stream(),
2324 "Please use -XX:OldPLABSize in place of "
2325 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2326 } else
2327 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2328 julong young_plab_size = 0;
2329 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2330 if (errcode != arg_in_range) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Invalid young PLAB size: %s\n", option->optionString);
2333 describe_range_error(errcode);
2334 return JNI_EINVAL;
2335 }
2336 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2337 jio_fprintf(defaultStream::error_stream(),
2338 "Please use -XX:YoungPLABSize in place of "
2339 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2340 } else
2341 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2342 // Skip -XX:Flags= since that case has already been handled
2343 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2344 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2345 return JNI_EINVAL;
2346 }
2347 }
2348 // Unknown option
2349 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2350 return JNI_ERR;
2351 }
2352 }
2353 // Change the default value for flags which have different default values
2354 // when working with older JDKs.
2355 if (JDK_Version::current().compare_major(6) <= 0 &&
2356 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2357 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2358 }
2359 return JNI_OK;
2360 }
2362 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2363 // This must be done after all -D arguments have been processed.
2364 scp_p->expand_endorsed();
2366 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2367 // Assemble the bootclasspath elements into the final path.
2368 Arguments::set_sysclasspath(scp_p->combined_path());
2369 }
2371 // This must be done after all arguments have been processed.
2372 // java_compiler() true means set to "NONE" or empty.
2373 if (java_compiler() && !xdebug_mode()) {
2374 // For backwards compatibility, we switch to interpreted mode if
2375 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2376 // not specified.
2377 set_mode_flags(_int);
2378 }
2379 if (CompileThreshold == 0) {
2380 set_mode_flags(_int);
2381 }
2383 #ifdef TIERED
2384 // If we are using tiered compilation in the tiered vm then c1 will
2385 // do the profiling and we don't want to waste that time in the
2386 // interpreter.
2387 if (TieredCompilation) {
2388 ProfileInterpreter = false;
2389 } else {
2390 // Since we are running vanilla server we must adjust the compile threshold
2391 // unless the user has already adjusted it because the default threshold assumes
2392 // we will run tiered.
2394 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2395 CompileThreshold = Tier2CompileThreshold;
2396 }
2397 }
2398 #endif // TIERED
2400 #ifndef COMPILER2
2401 // Don't degrade server performance for footprint
2402 if (FLAG_IS_DEFAULT(UseLargePages) &&
2403 MaxHeapSize < LargePageHeapSizeThreshold) {
2404 // No need for large granularity pages w/small heaps.
2405 // Note that large pages are enabled/disabled for both the
2406 // Java heap and the code cache.
2407 FLAG_SET_DEFAULT(UseLargePages, false);
2408 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2409 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2410 }
2412 #else
2413 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2414 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2415 }
2416 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2417 if (UseG1GC) {
2418 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2419 }
2420 #endif
2422 if (!check_vm_args_consistency()) {
2423 return JNI_ERR;
2424 }
2426 return JNI_OK;
2427 }
2429 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2430 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2431 scp_assembly_required_p);
2432 }
2434 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2435 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2436 scp_assembly_required_p);
2437 }
2439 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2440 const int N_MAX_OPTIONS = 64;
2441 const int OPTION_BUFFER_SIZE = 1024;
2442 char buffer[OPTION_BUFFER_SIZE];
2444 // The variable will be ignored if it exceeds the length of the buffer.
2445 // Don't check this variable if user has special privileges
2446 // (e.g. unix su command).
2447 if (os::getenv(name, buffer, sizeof(buffer)) &&
2448 !os::have_special_privileges()) {
2449 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Picked up %s: %s\n", name, buffer);
2452 char* rd = buffer; // pointer to the input string (rd)
2453 int i;
2454 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2455 while (isspace(*rd)) rd++; // skip whitespace
2456 if (*rd == 0) break; // we re done when the input string is read completely
2458 // The output, option string, overwrites the input string.
2459 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2460 // input string (rd).
2461 char* wrt = rd;
2463 options[i++].optionString = wrt; // Fill in option
2464 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2465 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2466 int quote = *rd; // matching quote to look for
2467 rd++; // don't copy open quote
2468 while (*rd != quote) { // include everything (even spaces) up until quote
2469 if (*rd == 0) { // string termination means unmatched string
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Unmatched quote in %s\n", name);
2472 return JNI_ERR;
2473 }
2474 *wrt++ = *rd++; // copy to option string
2475 }
2476 rd++; // don't copy close quote
2477 } else {
2478 *wrt++ = *rd++; // copy to option string
2479 }
2480 }
2481 // Need to check if we're done before writing a NULL,
2482 // because the write could be to the byte that rd is pointing to.
2483 if (*rd++ == 0) {
2484 *wrt = 0;
2485 break;
2486 }
2487 *wrt = 0; // Zero terminate option
2488 }
2489 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2490 JavaVMInitArgs vm_args;
2491 vm_args.version = JNI_VERSION_1_2;
2492 vm_args.options = options;
2493 vm_args.nOptions = i;
2494 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2496 if (PrintVMOptions) {
2497 const char* tail;
2498 for (int i = 0; i < vm_args.nOptions; i++) {
2499 const JavaVMOption *option = vm_args.options + i;
2500 if (match_option(option, "-XX:", &tail)) {
2501 logOption(tail);
2502 }
2503 }
2504 }
2506 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2507 }
2508 return JNI_OK;
2509 }
2511 // Parse entry point called from JNI_CreateJavaVM
2513 jint Arguments::parse(const JavaVMInitArgs* args) {
2515 // Sharing support
2516 // Construct the path to the archive
2517 char jvm_path[JVM_MAXPATHLEN];
2518 os::jvm_path(jvm_path, sizeof(jvm_path));
2519 #ifdef TIERED
2520 if (strstr(jvm_path, "client") != NULL) {
2521 force_client_mode = true;
2522 }
2523 #endif // TIERED
2524 char *end = strrchr(jvm_path, *os::file_separator());
2525 if (end != NULL) *end = '\0';
2526 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2527 strlen(os::file_separator()) + 20);
2528 if (shared_archive_path == NULL) return JNI_ENOMEM;
2529 strcpy(shared_archive_path, jvm_path);
2530 strcat(shared_archive_path, os::file_separator());
2531 strcat(shared_archive_path, "classes");
2532 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2533 strcat(shared_archive_path, ".jsa");
2534 SharedArchivePath = shared_archive_path;
2536 // Remaining part of option string
2537 const char* tail;
2539 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2540 bool settings_file_specified = false;
2541 const char* flags_file;
2542 int index;
2543 for (index = 0; index < args->nOptions; index++) {
2544 const JavaVMOption *option = args->options + index;
2545 if (match_option(option, "-XX:Flags=", &tail)) {
2546 flags_file = tail;
2547 settings_file_specified = true;
2548 }
2549 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2550 PrintVMOptions = true;
2551 }
2552 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2553 PrintVMOptions = false;
2554 }
2555 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2556 IgnoreUnrecognizedVMOptions = true;
2557 }
2558 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2559 IgnoreUnrecognizedVMOptions = false;
2560 }
2561 }
2563 if (IgnoreUnrecognizedVMOptions) {
2564 // uncast const to modify the flag args->ignoreUnrecognized
2565 *(jboolean*)(&args->ignoreUnrecognized) = true;
2566 }
2568 // Parse specified settings file
2569 if (settings_file_specified) {
2570 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2571 return JNI_EINVAL;
2572 }
2573 }
2575 // Parse default .hotspotrc settings file
2576 if (!settings_file_specified) {
2577 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2578 return JNI_EINVAL;
2579 }
2580 }
2582 if (PrintVMOptions) {
2583 for (index = 0; index < args->nOptions; index++) {
2584 const JavaVMOption *option = args->options + index;
2585 if (match_option(option, "-XX:", &tail)) {
2586 logOption(tail);
2587 }
2588 }
2589 }
2591 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2592 jint result = parse_vm_init_args(args);
2593 if (result != JNI_OK) {
2594 return result;
2595 }
2597 // These are hacks until G1 is fully supported and tested
2598 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
2599 if (UseG1GC) {
2600 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
2601 #ifndef PRODUCT
2602 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
2603 #endif // PRODUCT
2604 UseConcMarkSweepGC = false;
2605 UseParNewGC = false;
2606 UseParallelGC = false;
2607 UseParallelOldGC = false;
2608 UseSerialGC = false;
2609 }
2610 no_shared_spaces();
2611 }
2613 #ifndef PRODUCT
2614 if (TraceBytecodesAt != 0) {
2615 TraceBytecodes = true;
2616 }
2617 if (CountCompiledCalls) {
2618 if (UseCounterDecay) {
2619 warning("UseCounterDecay disabled because CountCalls is set");
2620 UseCounterDecay = false;
2621 }
2622 }
2623 #endif // PRODUCT
2625 if (PrintGCDetails) {
2626 // Turn on -verbose:gc options as well
2627 PrintGC = true;
2628 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2629 TraceClassUnloading = true;
2630 }
2631 }
2633 #ifdef SERIALGC
2634 set_serial_gc_flags();
2635 #endif // SERIALGC
2636 #ifdef KERNEL
2637 no_shared_spaces();
2638 #endif // KERNEL
2640 // Set flags based on ergonomics.
2641 set_ergonomics_flags();
2643 // Check the GC selections again.
2644 if (!check_gc_consistency()) {
2645 return JNI_EINVAL;
2646 }
2648 if (UseParallelGC || UseParallelOldGC) {
2649 // Set some flags for ParallelGC if needed.
2650 set_parallel_gc_flags();
2651 } else if (UseConcMarkSweepGC) {
2652 // Set some flags for CMS
2653 set_cms_and_parnew_gc_flags();
2654 } else if (UseParNewGC) {
2655 // Set some flags for ParNew
2656 set_parnew_gc_flags();
2657 }
2658 // Temporary; make the "if" an "else-if" before
2659 // we integrate G1. XXX
2660 if (UseG1GC) {
2661 // Set some flags for garbage-first, if needed.
2662 set_g1_gc_flags();
2663 }
2665 #ifdef SERIALGC
2666 assert(verify_serial_gc_flags(), "SerialGC unset");
2667 #endif // SERIALGC
2669 // Set bytecode rewriting flags
2670 set_bytecode_flags();
2672 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2673 set_aggressive_opts_flags();
2675 #ifdef CC_INTERP
2676 // Biased locking is not implemented with c++ interpreter
2677 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2678 #endif /* CC_INTERP */
2680 #ifdef COMPILER2
2681 if (!UseBiasedLocking || EmitSync != 0) {
2682 UseOptoBiasInlining = false;
2683 }
2684 #endif
2686 if (PrintCommandLineFlags) {
2687 CommandLineFlags::printSetFlags();
2688 }
2690 #ifdef ASSERT
2691 if (PrintFlagsFinal) {
2692 CommandLineFlags::printFlags();
2693 }
2694 #endif
2696 return JNI_OK;
2697 }
2699 int Arguments::PropertyList_count(SystemProperty* pl) {
2700 int count = 0;
2701 while(pl != NULL) {
2702 count++;
2703 pl = pl->next();
2704 }
2705 return count;
2706 }
2708 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2709 assert(key != NULL, "just checking");
2710 SystemProperty* prop;
2711 for (prop = pl; prop != NULL; prop = prop->next()) {
2712 if (strcmp(key, prop->key()) == 0) return prop->value();
2713 }
2714 return NULL;
2715 }
2717 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2718 int count = 0;
2719 const char* ret_val = NULL;
2721 while(pl != NULL) {
2722 if(count >= index) {
2723 ret_val = pl->key();
2724 break;
2725 }
2726 count++;
2727 pl = pl->next();
2728 }
2730 return ret_val;
2731 }
2733 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2734 int count = 0;
2735 char* ret_val = NULL;
2737 while(pl != NULL) {
2738 if(count >= index) {
2739 ret_val = pl->value();
2740 break;
2741 }
2742 count++;
2743 pl = pl->next();
2744 }
2746 return ret_val;
2747 }
2749 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2750 SystemProperty* p = *plist;
2751 if (p == NULL) {
2752 *plist = new_p;
2753 } else {
2754 while (p->next() != NULL) {
2755 p = p->next();
2756 }
2757 p->set_next(new_p);
2758 }
2759 }
2761 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2762 if (plist == NULL)
2763 return;
2765 SystemProperty* new_p = new SystemProperty(k, v, true);
2766 PropertyList_add(plist, new_p);
2767 }
2769 // This add maintains unique property key in the list.
2770 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
2771 if (plist == NULL)
2772 return;
2774 // If property key exist then update with new value.
2775 SystemProperty* prop;
2776 for (prop = *plist; prop != NULL; prop = prop->next()) {
2777 if (strcmp(k, prop->key()) == 0) {
2778 prop->set_value(v);
2779 return;
2780 }
2781 }
2783 PropertyList_add(plist, k, v);
2784 }
2786 #ifdef KERNEL
2787 char *Arguments::get_kernel_properties() {
2788 // Find properties starting with kernel and append them to string
2789 // We need to find out how long they are first because the URL's that they
2790 // might point to could get long.
2791 int length = 0;
2792 SystemProperty* prop;
2793 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2794 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2795 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2796 }
2797 }
2798 // Add one for null terminator.
2799 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2800 if (length != 0) {
2801 int pos = 0;
2802 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2803 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2804 jio_snprintf(&props[pos], length-pos,
2805 "-D%s=%s ", prop->key(), prop->value());
2806 pos = strlen(props);
2807 }
2808 }
2809 }
2810 // null terminate props in case of null
2811 props[length] = '\0';
2812 return props;
2813 }
2814 #endif // KERNEL
2816 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2817 // Returns true if all of the source pointed by src has been copied over to
2818 // the destination buffer pointed by buf. Otherwise, returns false.
2819 // Notes:
2820 // 1. If the length (buflen) of the destination buffer excluding the
2821 // NULL terminator character is not long enough for holding the expanded
2822 // pid characters, it also returns false instead of returning the partially
2823 // expanded one.
2824 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2825 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2826 char* buf, size_t buflen) {
2827 const char* p = src;
2828 char* b = buf;
2829 const char* src_end = &src[srclen];
2830 char* buf_end = &buf[buflen - 1];
2832 while (p < src_end && b < buf_end) {
2833 if (*p == '%') {
2834 switch (*(++p)) {
2835 case '%': // "%%" ==> "%"
2836 *b++ = *p++;
2837 break;
2838 case 'p': { // "%p" ==> current process id
2839 // buf_end points to the character before the last character so
2840 // that we could write '\0' to the end of the buffer.
2841 size_t buf_sz = buf_end - b + 1;
2842 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2844 // if jio_snprintf fails or the buffer is not long enough to hold
2845 // the expanded pid, returns false.
2846 if (ret < 0 || ret >= (int)buf_sz) {
2847 return false;
2848 } else {
2849 b += ret;
2850 assert(*b == '\0', "fail in copy_expand_pid");
2851 if (p == src_end && b == buf_end + 1) {
2852 // reach the end of the buffer.
2853 return true;
2854 }
2855 }
2856 p++;
2857 break;
2858 }
2859 default :
2860 *b++ = '%';
2861 }
2862 } else {
2863 *b++ = *p++;
2864 }
2865 }
2866 *b = '\0';
2867 return (p == src_end); // return false if not all of the source was copied
2868 }